SAFE public projects git trees. - safe/jmp/linux-2.6/blob - drivers/usb/serial/mos7840.c

   1 /*
   2  * This program is free software; you can redistribute it and/or modify
   3  * it under the terms of the GNU General Public License as published by
   4  * the Free Software Foundation; either version 2 of the License, or
   5  * (at your option) any later version.
   6  *
   7  * This program is distributed in the hope that it will be useful,
   8  * but WITHOUT ANY WARRANTY; without even the implied warranty of
   9  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  10  * GNU General Public License for more details.
  11  *
  12  * You should have received a copy of the GNU General Public License
  13  * along with this program; if not, write to the Free Software
  14  * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
  15  *
  16  * Clean ups from Moschip version and a few ioctl implementations by:
  17  *      Paul B Schroeder <pschroeder "at" uplogix "dot" com>
  18  *
  19  * Originally based on drivers/usb/serial/io_edgeport.c which is:
  20  *      Copyright (C) 2000 Inside Out Networks, All rights reserved.
  21  *      Copyright (C) 2001-2002 Greg Kroah-Hartman <greg@kroah.com>
  22  *
  23  */
  24
  25 #include <linux/kernel.h>
  26 #include <linux/errno.h>
  27 #include <linux/init.h>
  28 #include <linux/slab.h>
  29 #include <linux/tty.h>
  30 #include <linux/tty_driver.h>
  31 #include <linux/tty_flip.h>
  32 #include <linux/module.h>
  33 #include <linux/serial.h>
  34 #include <linux/usb.h>
  35 #include <linux/usb/serial.h>
  36 #include <asm/uaccess.h>
  37
  38 /*
  39  * Version Information
  40  */
  41 #define DRIVER_VERSION "1.3.1"
  42 #define DRIVER_DESC "Moschip 7840/7820 USB Serial Driver"
  43
  44 /*
  45  * 16C50 UART register defines
  46  */
  47
  48 #define LCR_BITS_5             0x00     /* 5 bits/char */
  49 #define LCR_BITS_6             0x01     /* 6 bits/char */
  50 #define LCR_BITS_7             0x02     /* 7 bits/char */
  51 #define LCR_BITS_8             0x03     /* 8 bits/char */
  52 #define LCR_BITS_MASK          0x03     /* Mask for bits/char field */
  53
  54 #define LCR_STOP_1             0x00     /* 1 stop bit */
  55 #define LCR_STOP_1_5           0x04     /* 1.5 stop bits (if 5   bits/char) */
  56 #define LCR_STOP_2             0x04     /* 2 stop bits   (if 6-8 bits/char) */
  57 #define LCR_STOP_MASK          0x04     /* Mask for stop bits field */
  58
  59 #define LCR_PAR_NONE           0x00     /* No parity */
  60 #define LCR_PAR_ODD            0x08     /* Odd parity */
  61 #define LCR_PAR_EVEN           0x18     /* Even parity */
  62 #define LCR_PAR_MARK           0x28     /* Force parity bit to 1 */
  63 #define LCR_PAR_SPACE          0x38     /* Force parity bit to 0 */
  64 #define LCR_PAR_MASK           0x38     /* Mask for parity field */
  65
  66 #define LCR_SET_BREAK          0x40     /* Set Break condition */
  67 #define LCR_DL_ENABLE          0x80     /* Enable access to divisor latch */
  68
  69 #define MCR_DTR                0x01     /* Assert DTR */
  70 #define MCR_RTS                0x02     /* Assert RTS */
  71 #define MCR_OUT1               0x04     /* Loopback only: Sets state of RI */
  72 #define MCR_MASTER_IE          0x08     /* Enable interrupt outputs */
  73 #define MCR_LOOPBACK           0x10     /* Set internal (digital) loopback mode */
  74 #define MCR_XON_ANY            0x20     /* Enable any char to exit XOFF mode */
  75
  76 #define MOS7840_MSR_CTS        0x10     /* Current state of CTS */
  77 #define MOS7840_MSR_DSR        0x20     /* Current state of DSR */
  78 #define MOS7840_MSR_RI         0x40     /* Current state of RI */
  79 #define MOS7840_MSR_CD         0x80     /* Current state of CD */
  80
  81 /*
  82  * Defines used for sending commands to port
  83  */
  84
  85 #define WAIT_FOR_EVER   (HZ * 0 )       /* timeout urb is wait for ever */
  86 #define MOS_WDR_TIMEOUT (HZ * 5 )       /* default urb timeout */
  87
  88 #define MOS_PORT1       0x0200
  89 #define MOS_PORT2       0x0300
  90 #define MOS_VENREG      0x0000
  91 #define MOS_MAX_PORT    0x02
  92 #define MOS_WRITE       0x0E
  93 #define MOS_READ        0x0D
  94
  95 /* Requests */
  96 #define MCS_RD_RTYPE    0xC0
  97 #define MCS_WR_RTYPE    0x40
  98 #define MCS_RDREQ       0x0D
  99 #define MCS_WRREQ       0x0E
 100 #define MCS_CTRL_TIMEOUT        500
 101 #define VENDOR_READ_LENGTH      (0x01)
 102
 103 #define MAX_NAME_LEN    64
 104
 105 #define ZLP_REG1  0x3A          //Zero_Flag_Reg1    58
 106 #define ZLP_REG5  0x3E          //Zero_Flag_Reg5    62
 107
 108 /* For higher baud Rates use TIOCEXBAUD */
 109 #define TIOCEXBAUD     0x5462
 110
 111 /* vendor id and device id defines */
 112
 113 #define USB_VENDOR_ID_MOSCHIP           0x9710
 114 #define MOSCHIP_DEVICE_ID_7840          0x7840
 115 #define MOSCHIP_DEVICE_ID_7820          0x7820
 116
 117 /* Interrupt Rotinue Defines    */
 118
 119 #define SERIAL_IIR_RLS      0x06
 120 #define SERIAL_IIR_MS       0x00
 121
 122 /*
 123  *  Emulation of the bit mask on the LINE STATUS REGISTER.
 124  */
 125 #define SERIAL_LSR_DR       0x0001
 126 #define SERIAL_LSR_OE       0x0002
 127 #define SERIAL_LSR_PE       0x0004
 128 #define SERIAL_LSR_FE       0x0008
 129 #define SERIAL_LSR_BI       0x0010
 130
 131 #define MOS_MSR_DELTA_CTS   0x10
 132 #define MOS_MSR_DELTA_DSR   0x20
 133 #define MOS_MSR_DELTA_RI    0x40
 134 #define MOS_MSR_DELTA_CD    0x80
 135
 136 // Serial Port register Address
 137 #define INTERRUPT_ENABLE_REGISTER  ((__u16)(0x01))
 138 #define FIFO_CONTROL_REGISTER      ((__u16)(0x02))
 139 #define LINE_CONTROL_REGISTER      ((__u16)(0x03))
 140 #define MODEM_CONTROL_REGISTER     ((__u16)(0x04))
 141 #define LINE_STATUS_REGISTER       ((__u16)(0x05))
 142 #define MODEM_STATUS_REGISTER      ((__u16)(0x06))
 143 #define SCRATCH_PAD_REGISTER       ((__u16)(0x07))
 144 #define DIVISOR_LATCH_LSB          ((__u16)(0x00))
 145 #define DIVISOR_LATCH_MSB          ((__u16)(0x01))
 146
 147 #define CLK_MULTI_REGISTER         ((__u16)(0x02))
 148 #define CLK_START_VALUE_REGISTER   ((__u16)(0x03))
 149
 150 #define SERIAL_LCR_DLAB            ((__u16)(0x0080))
 151
 152 /*
 153  * URB POOL related defines
 154  */
 155 #define NUM_URBS                        16      /* URB Count */
 156 #define URB_TRANSFER_BUFFER_SIZE        32      /* URB Size  */
 157
 158
 159 static struct usb_device_id moschip_port_id_table[] = {
 160         {USB_DEVICE(USB_VENDOR_ID_MOSCHIP, MOSCHIP_DEVICE_ID_7840)},
 161         {USB_DEVICE(USB_VENDOR_ID_MOSCHIP, MOSCHIP_DEVICE_ID_7820)},
 162         {}                      /* terminating entry */
 163 };
 164
 165 static __devinitdata struct usb_device_id moschip_id_table_combined[] = {
 166         {USB_DEVICE(USB_VENDOR_ID_MOSCHIP, MOSCHIP_DEVICE_ID_7840)},
 167         {USB_DEVICE(USB_VENDOR_ID_MOSCHIP, MOSCHIP_DEVICE_ID_7820)},
 168         {}                      /* terminating entry */
 169 };
 170
 171 MODULE_DEVICE_TABLE(usb, moschip_id_table_combined);
 172
 173 /* This structure holds all of the local port information */
 174
 175 struct moschip_port {
 176         int port_num;           /*Actual port number in the device(1,2,etc) */
 177         struct urb *write_urb;  /* write URB for this port */
 178         struct urb *read_urb;   /* read URB for this port */
 179         struct urb *int_urb;
 180         __u8 shadowLCR;         /* last LCR value received */
 181         __u8 shadowMCR;         /* last MCR value received */
 182         char open;
 183         char open_ports;
 184         char zombie;
 185         wait_queue_head_t wait_chase;   /* for handling sleeping while waiting for chase to finish */
 186         wait_queue_head_t delta_msr_wait;       /* for handling sleeping while waiting for msr change to happen */
 187         int delta_msr_cond;
 188         struct async_icount icount;
 189         struct usb_serial_port *port;   /* loop back to the owner of this object */
 190
 191         /*Offsets */
 192         __u8 SpRegOffset;
 193         __u8 ControlRegOffset;
 194         __u8 DcrRegOffset;
 195         //for processing control URBS in interrupt context
 196         struct urb *control_urb;
 197         struct usb_ctrlrequest *dr;
 198         char *ctrl_buf;
 199         int MsrLsr;
 200
 201         spinlock_t pool_lock;
 202         struct urb *write_urb_pool[NUM_URBS];
 203         char busy[NUM_URBS];
 204 };
 205
 206
 207 static int debug;
 208
 209 /*
 210  * mos7840_set_reg_sync
 211  *      To set the Control register by calling usb_fill_control_urb function
 212  *      by passing usb_sndctrlpipe function as parameter.
 213  */
 214
 215 static int mos7840_set_reg_sync(struct usb_serial_port *port, __u16 reg,
 216                                 __u16 val)
 217 {
 218         struct usb_device *dev = port->serial->dev;
 219         val = val & 0x00ff;
 220         dbg("mos7840_set_reg_sync offset is %x, value %x\n", reg, val);
 221
 222         return usb_control_msg(dev, usb_sndctrlpipe(dev, 0), MCS_WRREQ,
 223                                MCS_WR_RTYPE, val, reg, NULL, 0,
 224                                MOS_WDR_TIMEOUT);
 225 }
 226
 227 /*
 228  * mos7840_get_reg_sync
 229  *      To set the Uart register by calling usb_fill_control_urb function by
 230  *      passing usb_rcvctrlpipe function as parameter.
 231  */
 232
 233 static int mos7840_get_reg_sync(struct usb_serial_port *port, __u16 reg,
 234                                 __u16 * val)
 235 {
 236         struct usb_device *dev = port->serial->dev;
 237         int ret = 0;
 238
 239         ret = usb_control_msg(dev, usb_rcvctrlpipe(dev, 0), MCS_RDREQ,
 240                               MCS_RD_RTYPE, 0, reg, val, VENDOR_READ_LENGTH,
 241                               MOS_WDR_TIMEOUT);
 242         dbg("mos7840_get_reg_sync offset is %x, return val %x\n", reg, *val);
 243         *val = (*val) & 0x00ff;
 244         return ret;
 245 }
 246
 247 /*
 248  * mos7840_set_uart_reg
 249  *      To set the Uart register by calling usb_fill_control_urb function by
 250  *      passing usb_sndctrlpipe function as parameter.
 251  */
 252
 253 static int mos7840_set_uart_reg(struct usb_serial_port *port, __u16 reg,
 254                                 __u16 val)
 255 {
 256
 257         struct usb_device *dev = port->serial->dev;
 258         val = val & 0x00ff;
 259         // For the UART control registers, the application number need to be Or'ed
 260         if (port->serial->num_ports == 4) {
 261                 val |=
 262                     (((__u16) port->number - (__u16) (port->serial->minor)) +
 263                      1) << 8;
 264                 dbg("mos7840_set_uart_reg application number is %x\n", val);
 265         } else {
 266                 if (((__u16) port->number - (__u16) (port->serial->minor)) == 0) {
 267                         val |=
 268                             (((__u16) port->number -
 269                               (__u16) (port->serial->minor)) + 1) << 8;
 270                         dbg("mos7840_set_uart_reg application number is %x\n",
 271                             val);
 272                 } else {
 273                         val |=
 274                             (((__u16) port->number -
 275                               (__u16) (port->serial->minor)) + 2) << 8;
 276                         dbg("mos7840_set_uart_reg application number is %x\n",
 277                             val);
 278                 }
 279         }
 280         return usb_control_msg(dev, usb_sndctrlpipe(dev, 0), MCS_WRREQ,
 281                                MCS_WR_RTYPE, val, reg, NULL, 0,
 282                                MOS_WDR_TIMEOUT);
 283
 284 }
 285
 286 /*
 287  * mos7840_get_uart_reg
 288  *      To set the Control register by calling usb_fill_control_urb function
 289  *      by passing usb_rcvctrlpipe function as parameter.
 290  */
 291 static int mos7840_get_uart_reg(struct usb_serial_port *port, __u16 reg,
 292                                 __u16 * val)
 293 {
 294         struct usb_device *dev = port->serial->dev;
 295         int ret = 0;
 296         __u16 Wval;
 297
 298         //dbg("application number is %4x \n",(((__u16)port->number - (__u16)(port->serial->minor))+1)<<8);
 299         /*Wval  is same as application number */
 300         if (port->serial->num_ports == 4) {
 301                 Wval =
 302                     (((__u16) port->number - (__u16) (port->serial->minor)) +
 303                      1) << 8;
 304                 dbg("mos7840_get_uart_reg application number is %x\n", Wval);
 305         } else {
 306                 if (((__u16) port->number - (__u16) (port->serial->minor)) == 0) {
 307                         Wval =
 308                             (((__u16) port->number -
 309                               (__u16) (port->serial->minor)) + 1) << 8;
 310                         dbg("mos7840_get_uart_reg application number is %x\n",
 311                             Wval);
 312                 } else {
 313                         Wval =
 314                             (((__u16) port->number -
 315                               (__u16) (port->serial->minor)) + 2) << 8;
 316                         dbg("mos7840_get_uart_reg application number is %x\n",
 317                             Wval);
 318                 }
 319         }
 320         ret = usb_control_msg(dev, usb_rcvctrlpipe(dev, 0), MCS_RDREQ,
 321                               MCS_RD_RTYPE, Wval, reg, val, VENDOR_READ_LENGTH,
 322                               MOS_WDR_TIMEOUT);
 323         *val = (*val) & 0x00ff;
 324         return ret;
 325 }
 326
 327 static void mos7840_dump_serial_port(struct moschip_port *mos7840_port)
 328 {
 329
 330         dbg("***************************************\n");
 331         dbg("SpRegOffset is %2x\n", mos7840_port->SpRegOffset);
 332         dbg("ControlRegOffset is %2x \n", mos7840_port->ControlRegOffset);
 333         dbg("DCRRegOffset is %2x \n", mos7840_port->DcrRegOffset);
 334         dbg("***************************************\n");
 335
 336 }
 337
 338 /************************************************************************/
 339 /************************************************************************/
 340 /*             I N T E R F A C E   F U N C T I O N S                    */
 341 /*             I N T E R F A C E   F U N C T I O N S                    */
 342 /************************************************************************/
 343 /************************************************************************/
 344
 345 static inline void mos7840_set_port_private(struct usb_serial_port *port,
 346                                             struct moschip_port *data)
 347 {
 348         usb_set_serial_port_data(port, (void *)data);
 349 }
 350
 351 static inline struct moschip_port *mos7840_get_port_private(struct
 352                                                             usb_serial_port
 353                                                             *port)
 354 {
 355         return (struct moschip_port *)usb_get_serial_port_data(port);
 356 }
 357
 358 static void mos7840_handle_new_msr(struct moschip_port *port, __u8 new_msr)
 359 {
 360         struct moschip_port *mos7840_port;
 361         struct async_icount *icount;
 362         mos7840_port = port;
 363         icount = &mos7840_port->icount;
 364         if (new_msr &
 365             (MOS_MSR_DELTA_CTS | MOS_MSR_DELTA_DSR | MOS_MSR_DELTA_RI |
 366              MOS_MSR_DELTA_CD)) {
 367                 icount = &mos7840_port->icount;
 368
 369                 /* update input line counters */
 370                 if (new_msr & MOS_MSR_DELTA_CTS) {
 371                         icount->cts++;
 372                         smp_wmb();
 373                 }
 374                 if (new_msr & MOS_MSR_DELTA_DSR) {
 375                         icount->dsr++;
 376                         smp_wmb();
 377                 }
 378                 if (new_msr & MOS_MSR_DELTA_CD) {
 379                         icount->dcd++;
 380                         smp_wmb();
 381                 }
 382                 if (new_msr & MOS_MSR_DELTA_RI) {
 383                         icount->rng++;
 384                         smp_wmb();
 385                 }
 386         }
 387 }
 388
 389 static void mos7840_handle_new_lsr(struct moschip_port *port, __u8 new_lsr)
 390 {
 391         struct async_icount *icount;
 392
 393         dbg("%s - %02x", __FUNCTION__, new_lsr);
 394
 395         if (new_lsr & SERIAL_LSR_BI) {
 396                 //
 397                 // Parity and Framing errors only count if they
 398                 // occur exclusive of a break being
 399                 // received.
 400                 //
 401                 new_lsr &= (__u8) (SERIAL_LSR_OE | SERIAL_LSR_BI);
 402         }
 403
 404         /* update input line counters */
 405         icount = &port->icount;
 406         if (new_lsr & SERIAL_LSR_BI) {
 407                 icount->brk++;
 408                 smp_wmb();
 409         }
 410         if (new_lsr & SERIAL_LSR_OE) {
 411                 icount->overrun++;
 412                 smp_wmb();
 413         }
 414         if (new_lsr & SERIAL_LSR_PE) {
 415                 icount->parity++;
 416                 smp_wmb();
 417         }
 418         if (new_lsr & SERIAL_LSR_FE) {
 419                 icount->frame++;
 420                 smp_wmb();
 421         }
 422 }
 423
 424 /************************************************************************/
 425 /************************************************************************/
 426 /*            U S B  C A L L B A C K   F U N C T I O N S                */
 427 /*            U S B  C A L L B A C K   F U N C T I O N S                */
 428 /************************************************************************/
 429 /************************************************************************/
 430
 431 static void mos7840_control_callback(struct urb *urb)
 432 {
 433         unsigned char *data;
 434         struct moschip_port *mos7840_port;
 435         __u8 regval = 0x0;
 436         int result = 0;
 437
 438         if (!urb) {
 439                 dbg("%s", "Invalid Pointer !!!!:\n");
 440                 return;
 441         }
 442
 443         mos7840_port = (struct moschip_port *)urb->context;
 444
 445         switch (urb->status) {
 446         case 0:
 447                 /* success */
 448                 break;
 449         case -ECONNRESET:
 450         case -ENOENT:
 451         case -ESHUTDOWN:
 452                 /* this urb is terminated, clean up */
 453                 dbg("%s - urb shutting down with status: %d", __FUNCTION__,
 454                     urb->status);
 455                 return;
 456         default:
 457                 dbg("%s - nonzero urb status received: %d", __FUNCTION__,
 458                     urb->status);
 459                 goto exit;
 460         }
 461
 462         dbg("%s urb buffer size is %d\n", __FUNCTION__, urb->actual_length);
 463         dbg("%s mos7840_port->MsrLsr is %d port %d\n", __FUNCTION__,
 464             mos7840_port->MsrLsr, mos7840_port->port_num);
 465         data = urb->transfer_buffer;
 466         regval = (__u8) data[0];
 467         dbg("%s data is %x\n", __FUNCTION__, regval);
 468         if (mos7840_port->MsrLsr == 0)
 469                 mos7840_handle_new_msr(mos7840_port, regval);
 470         else if (mos7840_port->MsrLsr == 1)
 471                 mos7840_handle_new_lsr(mos7840_port, regval);
 472
 473 exit:
 474         spin_lock(&mos7840_port->pool_lock);
 475         if (!mos7840_port->zombie)
 476                 result = usb_submit_urb(mos7840_port->int_urb, GFP_ATOMIC);
 477         spin_unlock(&mos7840_port->pool_lock);
 478         if (result) {
 479                 dev_err(&urb->dev->dev,
 480                         "%s - Error %d submitting interrupt urb\n",
 481                         __FUNCTION__, result);
 482         }
 483 }
 484
 485 static int mos7840_get_reg(struct moschip_port *mcs, __u16 Wval, __u16 reg,
 486                            __u16 * val)
 487 {
 488         struct usb_device *dev = mcs->port->serial->dev;
 489         struct usb_ctrlrequest *dr = mcs->dr;
 490         unsigned char *buffer = mcs->ctrl_buf;
 491         int ret;
 492
 493         dr->bRequestType = MCS_RD_RTYPE;
 494         dr->bRequest = MCS_RDREQ;
 495         dr->wValue = cpu_to_le16(Wval); //0;
 496         dr->wIndex = cpu_to_le16(reg);
 497         dr->wLength = cpu_to_le16(2);
 498
 499         usb_fill_control_urb(mcs->control_urb, dev, usb_rcvctrlpipe(dev, 0),
 500                              (unsigned char *)dr, buffer, 2,
 501                              mos7840_control_callback, mcs);
 502         mcs->control_urb->transfer_buffer_length = 2;
 503         ret = usb_submit_urb(mcs->control_urb, GFP_ATOMIC);
 504         return ret;
 505 }
 506
 507 /*****************************************************************************
 508  * mos7840_interrupt_callback
 509  *      this is the callback function for when we have received data on the
 510  *      interrupt endpoint.
 511  *****************************************************************************/
 512
 513 static void mos7840_interrupt_callback(struct urb *urb)
 514 {
 515         int result;
 516         int length;
 517         struct moschip_port *mos7840_port;
 518         struct usb_serial *serial;
 519         __u16 Data;
 520         unsigned char *data;
 521         __u8 sp[5], st;
 522         int i, rv = 0;
 523         __u16 wval, wreg = 0;
 524
 525         dbg("%s", " : Entering\n");
 526         if (!urb) {
 527                 dbg("%s", "Invalid Pointer !!!!:\n");
 528                 return;
 529         }
 530
 531         switch (urb->status) {
 532         case 0:
 533                 /* success */
 534                 break;
 535         case -ECONNRESET:
 536         case -ENOENT:
 537         case -ESHUTDOWN:
 538                 /* this urb is terminated, clean up */
 539                 dbg("%s - urb shutting down with status: %d", __FUNCTION__,
 540                     urb->status);
 541                 return;
 542         default:
 543                 dbg("%s - nonzero urb status received: %d", __FUNCTION__,
 544                     urb->status);
 545                 goto exit;
 546         }
 547
 548         length = urb->actual_length;
 549         data = urb->transfer_buffer;
 550
 551         serial = (struct usb_serial *)urb->context;
 552
 553         /* Moschip get 5 bytes
 554          * Byte 1 IIR Port 1 (port.number is 0)
 555          * Byte 2 IIR Port 2 (port.number is 1)
 556          * Byte 3 IIR Port 3 (port.number is 2)
 557          * Byte 4 IIR Port 4 (port.number is 3)
 558          * Byte 5 FIFO status for both */
 559
 560         if (length && length > 5) {
 561                 dbg("%s \n", "Wrong data !!!");
 562                 return;
 563         }
 564
 565         sp[0] = (__u8) data[0];
 566         sp[1] = (__u8) data[1];
 567         sp[2] = (__u8) data[2];
 568         sp[3] = (__u8) data[3];
 569         st = (__u8) data[4];
 570
 571         for (i = 0; i < serial->num_ports; i++) {
 572                 mos7840_port = mos7840_get_port_private(serial->port[i]);
 573                 wval =
 574                     (((__u16) serial->port[i]->number -
 575                       (__u16) (serial->minor)) + 1) << 8;
 576                 if (mos7840_port->open) {
 577                         if (sp[i] & 0x01) {
 578                                 dbg("SP%d No Interrupt !!!\n", i);
 579                         } else {
 580                                 switch (sp[i] & 0x0f) {
 581                                 case SERIAL_IIR_RLS:
 582                                         dbg("Serial Port %d: Receiver status error or ", i);
 583                                         dbg("address bit detected in 9-bit mode\n");
 584                                         mos7840_port->MsrLsr = 1;
 585                                         wreg = LINE_STATUS_REGISTER;
 586                                         break;
 587                                 case SERIAL_IIR_MS:
 588                                         dbg("Serial Port %d: Modem status change\n", i);
 589                                         mos7840_port->MsrLsr = 0;
 590                                         wreg = MODEM_STATUS_REGISTER;
 591                                         break;
 592                                 }
 593                                 spin_lock(&mos7840_port->pool_lock);
 594                                 if (!mos7840_port->zombie) {
 595                                         rv = mos7840_get_reg(mos7840_port, wval, wreg, &Data);
 596                                 } else {
 597                                         spin_unlock(&mos7840_port->pool_lock);
 598                                         return;
 599                                 }
 600                                 spin_unlock(&mos7840_port->pool_lock);
 601                         }
 602                 }
 603         }
 604         if (!(rv < 0)) /* the completion handler for the control urb will resubmit */
 605                 return;
 606 exit:
 607         result = usb_submit_urb(urb, GFP_ATOMIC);
 608         if (result) {
 609                 dev_err(&urb->dev->dev,
 610                         "%s - Error %d submitting interrupt urb\n",
 611                         __FUNCTION__, result);
 612         }
 613 }
 614
 615 static int mos7840_port_paranoia_check(struct usb_serial_port *port,
 616                                        const char *function)
 617 {
 618         if (!port) {
 619                 dbg("%s - port == NULL", function);
 620                 return -1;
 621         }
 622         if (!port->serial) {
 623                 dbg("%s - port->serial == NULL", function);
 624                 return -1;
 625         }
 626
 627         return 0;
 628 }
 629
 630 /* Inline functions to check the sanity of a pointer that is passed to us */
 631 static int mos7840_serial_paranoia_check(struct usb_serial *serial,
 632                                          const char *function)
 633 {
 634         if (!serial) {
 635                 dbg("%s - serial == NULL", function);
 636                 return -1;
 637         }
 638         if (!serial->type) {
 639                 dbg("%s - serial->type == NULL!", function);
 640                 return -1;
 641         }
 642
 643         return 0;
 644 }
 645
 646 static struct usb_serial *mos7840_get_usb_serial(struct usb_serial_port *port,
 647                                                  const char *function)
 648 {
 649         /* if no port was specified, or it fails a paranoia check */
 650         if (!port ||
 651             mos7840_port_paranoia_check(port, function) ||
 652             mos7840_serial_paranoia_check(port->serial, function)) {
 653                 /* then say that we don't have a valid usb_serial thing, which will
 654                  * end up genrating -ENODEV return values */
 655                 return NULL;
 656         }
 657
 658         return port->serial;
 659 }
 660
 661 /*****************************************************************************
 662  * mos7840_bulk_in_callback
 663  *      this is the callback function for when we have received data on the
 664  *      bulk in endpoint.
 665  *****************************************************************************/
 666
 667 static void mos7840_bulk_in_callback(struct urb *urb)
 668 {
 669         int status;
 670         unsigned char *data;
 671         struct usb_serial *serial;
 672         struct usb_serial_port *port;
 673         struct moschip_port *mos7840_port;
 674         struct tty_struct *tty;
 675
 676         if (!urb) {
 677                 dbg("%s", "Invalid Pointer !!!!:\n");
 678                 return;
 679         }
 680
 681         if (urb->status) {
 682                 dbg("nonzero read bulk status received: %d", urb->status);
 683                 return;
 684         }
 685
 686         mos7840_port = (struct moschip_port *)urb->context;
 687         if (!mos7840_port) {
 688                 dbg("%s", "NULL mos7840_port pointer \n");
 689                 return;
 690         }
 691
 692         port = (struct usb_serial_port *)mos7840_port->port;
 693         if (mos7840_port_paranoia_check(port, __FUNCTION__)) {
 694                 dbg("%s", "Port Paranoia failed \n");
 695                 return;
 696         }
 697
 698         serial = mos7840_get_usb_serial(port, __FUNCTION__);
 699         if (!serial) {
 700                 dbg("%s\n", "Bad serial pointer ");
 701                 return;
 702         }
 703
 704         dbg("%s\n", "Entering... \n");
 705
 706         data = urb->transfer_buffer;
 707
 708         dbg("%s", "Entering ........... \n");
 709
 710         if (urb->actual_length) {
 711                 tty = mos7840_port->port->tty;
 712                 if (tty) {
 713                         tty_buffer_request_room(tty, urb->actual_length);
 714                         tty_insert_flip_string(tty, data, urb->actual_length);
 715                         dbg(" %s \n", data);
 716                         tty_flip_buffer_push(tty);
 717                 }
 718                 mos7840_port->icount.rx += urb->actual_length;
 719                 smp_wmb();
 720                 dbg("mos7840_port->icount.rx is %d:\n",
 721                     mos7840_port->icount.rx);
 722         }
 723
 724         if (!mos7840_port->read_urb) {
 725                 dbg("%s", "URB KILLED !!!\n");
 726                 return;
 727         }
 728
 729
 730         mos7840_port->read_urb->dev = serial->dev;
 731
 732         status = usb_submit_urb(mos7840_port->read_urb, GFP_ATOMIC);
 733
 734         if (status) {
 735                 dbg(" usb_submit_urb(read bulk) failed, status = %d",
 736                  status);
 737         }
 738 }
 739
 740 /*****************************************************************************
 741  * mos7840_bulk_out_data_callback
 742  *      this is the callback function for when we have finished sending serial data
 743  *      on the bulk out endpoint.
 744  *****************************************************************************/
 745
 746 static void mos7840_bulk_out_data_callback(struct urb *urb)
 747 {
 748         struct moschip_port *mos7840_port;
 749         struct tty_struct *tty;
 750         int i;
 751
 752         if (!urb) {
 753                 dbg("%s", "Invalid Pointer !!!!:\n");
 754                 return;
 755         }
 756
 757         mos7840_port = (struct moschip_port *)urb->context;
 758         spin_lock(&mos7840_port->pool_lock);
 759         for (i = 0; i < NUM_URBS; i++) {
 760                 if (urb == mos7840_port->write_urb_pool[i]) {
 761                         mos7840_port->busy[i] = 0;
 762                         break;
 763                 }
 764         }
 765         spin_unlock(&mos7840_port->pool_lock);
 766
 767         if (urb->status) {
 768                 dbg("nonzero write bulk status received:%d\n", urb->status);
 769                 return;
 770         }
 771
 772         if (mos7840_port_paranoia_check(mos7840_port->port, __FUNCTION__)) {
 773                 dbg("%s", "Port Paranoia failed \n");
 774                 return;
 775         }
 776
 777         dbg("%s \n", "Entering .........");
 778
 779         tty = mos7840_port->port->tty;
 780
 781         if (tty && mos7840_port->open)
 782                 tty_wakeup(tty);
 783
 784 }
 785
 786 /************************************************************************/
 787 /*       D R I V E R  T T Y  I N T E R F A C E  F U N C T I O N S       */
 788 /************************************************************************/
 789 #ifdef MCSSerialProbe
 790 static int mos7840_serial_probe(struct usb_serial *serial,
 791                                 const struct usb_device_id *id)
 792 {
 793
 794         /*need to implement the mode_reg reading and updating\
 795            structures usb_serial_ device_type\
 796            (i.e num_ports, num_bulkin,bulkout etc) */
 797         /* Also we can update the changes  attach */
 798         return 1;
 799 }
 800 #endif
 801
 802 /*****************************************************************************
 803  * mos7840_open
 804  *      this function is called by the tty driver when a port is opened
 805  *      If successful, we return 0
 806  *      Otherwise we return a negative error number.
 807  *****************************************************************************/
 808
 809 static int mos7840_open(struct usb_serial_port *port, struct file *filp)
 810 {
 811         int response;
 812         int j;
 813         struct usb_serial *serial;
 814         struct urb *urb;
 815         __u16 Data;
 816         int status;
 817         struct moschip_port *mos7840_port;
 818         struct moschip_port *port0;
 819
 820         if (mos7840_port_paranoia_check(port, __FUNCTION__)) {
 821                 dbg("%s", "Port Paranoia failed \n");
 822                 return -ENODEV;
 823         }
 824
 825         serial = port->serial;
 826
 827         if (mos7840_serial_paranoia_check(serial, __FUNCTION__)) {
 828                 dbg("%s", "Serial Paranoia failed \n");
 829                 return -ENODEV;
 830         }
 831
 832         mos7840_port = mos7840_get_port_private(port);
 833         port0 = mos7840_get_port_private(serial->port[0]);
 834
 835         if (mos7840_port == NULL || port0 == NULL)
 836                 return -ENODEV;
 837
 838         usb_clear_halt(serial->dev, port->write_urb->pipe);
 839         usb_clear_halt(serial->dev, port->read_urb->pipe);
 840         port0->open_ports++;
 841
 842         /* Initialising the write urb pool */
 843         for (j = 0; j < NUM_URBS; ++j) {
 844                 urb = usb_alloc_urb(0, GFP_KERNEL);
 845                 mos7840_port->write_urb_pool[j] = urb;
 846
 847                 if (urb == NULL) {
 848                         err("No more urbs???");
 849                         continue;
 850                 }
 851
 852                 urb->transfer_buffer = kmalloc(URB_TRANSFER_BUFFER_SIZE, GFP_KERNEL);
 853                 if (!urb->transfer_buffer) {
 854                         usb_free_urb(urb);
 855                         mos7840_port->write_urb_pool[j] = NULL;
 856                         err("%s-out of memory for urb buffers.", __FUNCTION__);
 857                         continue;
 858                 }
 859         }
 860
 861 /*****************************************************************************
 862  * Initialize MCS7840 -- Write Init values to corresponding Registers
 863  *
 864  * Register Index
 865  * 1 : IER
 866  * 2 : FCR
 867  * 3 : LCR
 868  * 4 : MCR
 869  *
 870  * 0x08 : SP1/2 Control Reg
 871  *****************************************************************************/
 872
 873 //NEED to check the following Block
 874
 875         status = 0;
 876         Data = 0x0;
 877         status = mos7840_get_reg_sync(port, mos7840_port->SpRegOffset, &Data);
 878         if (status < 0) {
 879                 dbg("Reading Spreg failed\n");
 880                 return -1;
 881         }
 882         Data |= 0x80;
 883         status = mos7840_set_reg_sync(port, mos7840_port->SpRegOffset, Data);
 884         if (status < 0) {
 885                 dbg("writing Spreg failed\n");
 886                 return -1;
 887         }
 888
 889         Data &= ~0x80;
 890         status = mos7840_set_reg_sync(port, mos7840_port->SpRegOffset, Data);
 891         if (status < 0) {
 892                 dbg("writing Spreg failed\n");
 893                 return -1;
 894         }
 895 //End of block to be checked
 896
 897         status = 0;
 898         Data = 0x0;
 899         status =
 900             mos7840_get_reg_sync(port, mos7840_port->ControlRegOffset, &Data);
 901         if (status < 0) {
 902                 dbg("Reading Controlreg failed\n");
 903                 return -1;
 904         }
 905         Data |= 0x08;           //Driver done bit
 906         Data |= 0x20;           //rx_disable
 907         status = mos7840_set_reg_sync(port, mos7840_port->ControlRegOffset, Data);
 908         if (status < 0) {
 909                 dbg("writing Controlreg failed\n");
 910                 return -1;
 911         }
 912         //do register settings here
 913         // Set all regs to the device default values.
 914         ////////////////////////////////////
 915         // First Disable all interrupts.
 916         ////////////////////////////////////
 917
 918         Data = 0x00;
 919         status = mos7840_set_uart_reg(port, INTERRUPT_ENABLE_REGISTER, Data);
 920         if (status < 0) {
 921                 dbg("disableing interrupts failed\n");
 922                 return -1;
 923         }
 924         // Set FIFO_CONTROL_REGISTER to the default value
 925         Data = 0x00;
 926         status = mos7840_set_uart_reg(port, FIFO_CONTROL_REGISTER, Data);
 927         if (status < 0) {
 928                 dbg("Writing FIFO_CONTROL_REGISTER  failed\n");
 929                 return -1;
 930         }
 931
 932         Data = 0xcf;
 933         status = mos7840_set_uart_reg(port, FIFO_CONTROL_REGISTER, Data);
 934         if (status < 0) {
 935                 dbg("Writing FIFO_CONTROL_REGISTER  failed\n");
 936                 return -1;
 937         }
 938
 939         Data = 0x03;
 940         status = mos7840_set_uart_reg(port, LINE_CONTROL_REGISTER, Data);
 941         mos7840_port->shadowLCR = Data;
 942
 943         Data = 0x0b;
 944         status = mos7840_set_uart_reg(port, MODEM_CONTROL_REGISTER, Data);
 945         mos7840_port->shadowMCR = Data;
 946
 947         Data = 0x00;
 948         status = mos7840_get_uart_reg(port, LINE_CONTROL_REGISTER, &Data);
 949         mos7840_port->shadowLCR = Data;
 950
 951         Data |= SERIAL_LCR_DLAB;        //data latch enable in LCR 0x80
 952         status = mos7840_set_uart_reg(port, LINE_CONTROL_REGISTER, Data);
 953
 954         Data = 0x0c;
 955         status = 0;
 956         status = mos7840_set_uart_reg(port, DIVISOR_LATCH_LSB, Data);
 957
 958         Data = 0x0;
 959         status = 0;
 960         status = mos7840_set_uart_reg(port, DIVISOR_LATCH_MSB, Data);
 961
 962         Data = 0x00;
 963         status = 0;
 964         status = mos7840_get_uart_reg(port, LINE_CONTROL_REGISTER, &Data);
 965
 966         Data = Data & ~SERIAL_LCR_DLAB;
 967         status = 0;
 968         status = mos7840_set_uart_reg(port, LINE_CONTROL_REGISTER, Data);
 969         mos7840_port->shadowLCR = Data;
 970
 971         //clearing Bulkin and Bulkout Fifo
 972         Data = 0x0;
 973         status = 0;
 974         status = mos7840_get_reg_sync(port, mos7840_port->SpRegOffset, &Data);
 975
 976         Data = Data | 0x0c;
 977         status = 0;
 978         status = mos7840_set_reg_sync(port, mos7840_port->SpRegOffset, Data);
 979
 980         Data = Data & ~0x0c;
 981         status = 0;
 982         status = mos7840_set_reg_sync(port, mos7840_port->SpRegOffset, Data);
 983         //Finally enable all interrupts
 984         Data = 0x0;
 985         Data = 0x0c;
 986         status = 0;
 987         status = mos7840_set_uart_reg(port, INTERRUPT_ENABLE_REGISTER, Data);
 988
 989         //clearing rx_disable
 990         Data = 0x0;
 991         status = 0;
 992         status =
 993             mos7840_get_reg_sync(port, mos7840_port->ControlRegOffset, &Data);
 994         Data = Data & ~0x20;
 995         status = 0;
 996         status =
 997             mos7840_set_reg_sync(port, mos7840_port->ControlRegOffset, Data);
 998
 999         // rx_negate
1000         Data = 0x0;
1001         status = 0;
1002         status =
1003             mos7840_get_reg_sync(port, mos7840_port->ControlRegOffset, &Data);
1004         Data = Data | 0x10;
1005         status = 0;
1006         status =
1007             mos7840_set_reg_sync(port, mos7840_port->ControlRegOffset, Data);
1008
1009         /* force low_latency on so that our tty_push actually forces *
1010          * the data through,otherwise it is scheduled, and with      *
1011          * high data rates (like with OHCI) data can get lost.       */
1012
1013         if (port->tty)
1014                 port->tty->low_latency = 1;
1015 /* Check to see if we've set up our endpoint info yet    *
1016      * (can't set it up in mos7840_startup as the structures *
1017      * were not set up at that time.)                        */
1018         if (port0->open_ports == 1) {
1019                 if (serial->port[0]->interrupt_in_buffer == NULL) {
1020
1021                         /* set up interrupt urb */
1022
1023                         usb_fill_int_urb(serial->port[0]->interrupt_in_urb,
1024                                          serial->dev,
1025                                          usb_rcvintpipe(serial->dev,
1026                                                         serial->port[0]->
1027                                                         interrupt_in_endpointAddress),
1028                                          serial->port[0]->interrupt_in_buffer,
1029                                          serial->port[0]->interrupt_in_urb->
1030                                          transfer_buffer_length,
1031                                          mos7840_interrupt_callback,
1032                                          serial,
1033                                          serial->port[0]->interrupt_in_urb->
1034                                          interval);
1035
1036                         /* start interrupt read for mos7840               *
1037                          * will continue as long as mos7840 is connected  */
1038
1039                         response =
1040                             usb_submit_urb(serial->port[0]->interrupt_in_urb,
1041                                            GFP_KERNEL);
1042                         if (response) {
1043                                 err("%s - Error %d submitting interrupt urb",
1044                                     __FUNCTION__, response);
1045                         }
1046
1047                 }
1048
1049         }
1050
1051         /* see if we've set up our endpoint info yet   *
1052          * (can't set it up in mos7840_startup as the  *
1053          * structures were not set up at that time.)   */
1054
1055         dbg("port number is %d \n", port->number);
1056         dbg("serial number is %d \n", port->serial->minor);
1057         dbg("Bulkin endpoint is %d \n", port->bulk_in_endpointAddress);
1058         dbg("BulkOut endpoint is %d \n", port->bulk_out_endpointAddress);
1059         dbg("Interrupt endpoint is %d \n", port->interrupt_in_endpointAddress);
1060         dbg("port's number in the device is %d\n", mos7840_port->port_num);
1061         mos7840_port->read_urb = port->read_urb;
1062
1063         /* set up our bulk in urb */
1064
1065         usb_fill_bulk_urb(mos7840_port->read_urb,
1066                           serial->dev,
1067                           usb_rcvbulkpipe(serial->dev,
1068                                           port->bulk_in_endpointAddress),
1069                           port->bulk_in_buffer,
1070                           mos7840_port->read_urb->transfer_buffer_length,
1071                           mos7840_bulk_in_callback, mos7840_port);
1072
1073         dbg("mos7840_open: bulkin endpoint is %d\n",
1074             port->bulk_in_endpointAddress);
1075         response = usb_submit_urb(mos7840_port->read_urb, GFP_KERNEL);
1076         if (response) {
1077                 err("%s - Error %d submitting control urb", __FUNCTION__,
1078                     response);
1079         }
1080
1081         /* initialize our wait queues */
1082         init_waitqueue_head(&mos7840_port->wait_chase);
1083         init_waitqueue_head(&mos7840_port->delta_msr_wait);
1084
1085         /* initialize our icount structure */
1086         memset(&(mos7840_port->icount), 0x00, sizeof(mos7840_port->icount));
1087
1088         /* initialize our port settings */
1089         mos7840_port->shadowMCR = MCR_MASTER_IE;        /* Must set to enable ints! */
1090         /* send a open port command */
1091         mos7840_port->open = 1;
1092         //mos7840_change_port_settings(mos7840_port,old_termios);
1093         mos7840_port->icount.tx = 0;
1094         mos7840_port->icount.rx = 0;
1095
1096         dbg("\n\nusb_serial serial:%p       mos7840_port:%p\n      usb_serial_port port:%p\n\n", serial, mos7840_port, port);
1097
1098         return 0;
1099
1100 }
1101
1102 /*****************************************************************************
1103  * mos7840_chars_in_buffer
1104  *      this function is called by the tty driver when it wants to know how many
1105  *      bytes of data we currently have outstanding in the port (data that has
1106  *      been written, but hasn't made it out the port yet)
1107  *      If successful, we return the number of bytes left to be written in the
1108  *      system,
1109  *      Otherwise we return a negative error number.
1110  *****************************************************************************/
1111
1112 static int mos7840_chars_in_buffer(struct usb_serial_port *port)
1113 {
1114         int i;
1115         int chars = 0;
1116         unsigned long flags;
1117         struct moschip_port *mos7840_port;
1118
1119         dbg("%s \n", " mos7840_chars_in_buffer:entering ...........");
1120
1121         if (mos7840_port_paranoia_check(port, __FUNCTION__)) {
1122                 dbg("%s", "Invalid port \n");
1123                 return -1;
1124         }
1125
1126         mos7840_port = mos7840_get_port_private(port);
1127         if (mos7840_port == NULL) {
1128                 dbg("%s \n", "mos7840_break:leaving ...........");
1129                 return -1;
1130         }
1131
1132         spin_lock_irqsave(&mos7840_port->pool_lock,flags);
1133         for (i = 0; i < NUM_URBS; ++i) {
1134                 if (mos7840_port->busy[i]) {
1135                         chars += URB_TRANSFER_BUFFER_SIZE;
1136                 }
1137         }
1138         spin_unlock_irqrestore(&mos7840_port->pool_lock,flags);
1139         dbg("%s - returns %d", __FUNCTION__, chars);
1140         return chars;
1141
1142 }
1143
1144 /************************************************************************
1145  *
1146  * mos7840_block_until_tx_empty
1147  *
1148  *      This function will block the close until one of the following:
1149  *              1. TX count are 0
1150  *              2. The mos7840 has stopped
1151  *              3. A timout of 3 seconds without activity has expired
1152  *
1153  ************************************************************************/
1154 static void mos7840_block_until_tx_empty(struct moschip_port *mos7840_port)
1155 {
1156         int timeout = HZ / 10;
1157         int wait = 30;
1158         int count;
1159
1160         while (1) {
1161
1162                 count = mos7840_chars_in_buffer(mos7840_port->port);
1163
1164                 /* Check for Buffer status */
1165                 if (count <= 0) {
1166                         return;
1167                 }
1168
1169                 /* Block the thread for a while */
1170                 interruptible_sleep_on_timeout(&mos7840_port->wait_chase,
1171                                                timeout);
1172
1173                 /* No activity.. count down section */
1174                 wait--;
1175                 if (wait == 0) {
1176                         dbg("%s - TIMEOUT", __FUNCTION__);
1177                         return;
1178                 } else {
1179                         /* Reset timout value back to seconds */
1180                         wait = 30;
1181                 }
1182         }
1183 }
1184
1185 /*****************************************************************************
1186  * mos7840_close
1187  *      this function is called by the tty driver when a port is closed
1188  *****************************************************************************/
1189
1190 static void mos7840_close(struct usb_serial_port *port, struct file *filp)
1191 {
1192         struct usb_serial *serial;
1193         struct moschip_port *mos7840_port;
1194         struct moschip_port *port0;
1195         int j;
1196         __u16 Data;
1197
1198         dbg("%s\n", "mos7840_close:entering...");
1199
1200         if (mos7840_port_paranoia_check(port, __FUNCTION__)) {
1201                 dbg("%s", "Port Paranoia failed \n");
1202                 return;
1203         }
1204
1205         serial = mos7840_get_usb_serial(port, __FUNCTION__);
1206         if (!serial) {
1207                 dbg("%s", "Serial Paranoia failed \n");
1208                 return;
1209         }
1210
1211         mos7840_port = mos7840_get_port_private(port);
1212         port0 = mos7840_get_port_private(serial->port[0]);
1213
1214         if (mos7840_port == NULL || port0 == NULL)
1215                 return;
1216
1217         for (j = 0; j < NUM_URBS; ++j)
1218                 usb_kill_urb(mos7840_port->write_urb_pool[j]);
1219
1220         /* Freeing Write URBs */
1221         for (j = 0; j < NUM_URBS; ++j) {
1222                 if (mos7840_port->write_urb_pool[j]) {
1223                         if (mos7840_port->write_urb_pool[j]->transfer_buffer)
1224                                 kfree(mos7840_port->write_urb_pool[j]->
1225                                       transfer_buffer);
1226
1227                         usb_free_urb(mos7840_port->write_urb_pool[j]);
1228                 }
1229         }
1230
1231         if (serial->dev) {
1232                 /* flush and block until tx is empty */
1233                 mos7840_block_until_tx_empty(mos7840_port);
1234         }
1235
1236         /* While closing port, shutdown all bulk read, write  *
1237          * and interrupt read if they exists                  */
1238         if (serial->dev) {
1239
1240                 if (mos7840_port->write_urb) {
1241                         dbg("%s", "Shutdown bulk write\n");
1242                         usb_kill_urb(mos7840_port->write_urb);
1243                 }
1244
1245                 if (mos7840_port->read_urb) {
1246                         dbg("%s", "Shutdown bulk read\n");
1247                         usb_kill_urb(mos7840_port->read_urb);
1248                 }
1249                 if ((&mos7840_port->control_urb)) {
1250                         dbg("%s", "Shutdown control read\n");
1251                         //      usb_kill_urb (mos7840_port->control_urb);
1252
1253                 }
1254         }
1255 //              if(mos7840_port->ctrl_buf != NULL)
1256 //                      kfree(mos7840_port->ctrl_buf);
1257         port0->open_ports--;
1258         dbg("mos7840_num_open_ports in close%d:in port%d\n",
1259             port0->open_ports, port->number);
1260         if (port0->open_ports == 0) {
1261                 if (serial->port[0]->interrupt_in_urb) {
1262                         dbg("%s", "Shutdown interrupt_in_urb\n");
1263                         usb_kill_urb(serial->port[0]->interrupt_in_urb);
1264                 }
1265         }
1266
1267         if (mos7840_port->write_urb) {
1268                 /* if this urb had a transfer buffer already (old tx) free it */
1269
1270                 if (mos7840_port->write_urb->transfer_buffer != NULL) {
1271                         kfree(mos7840_port->write_urb->transfer_buffer);
1272                 }
1273                 usb_free_urb(mos7840_port->write_urb);
1274         }
1275
1276         Data = 0x0;
1277         mos7840_set_uart_reg(port, MODEM_CONTROL_REGISTER, Data);
1278
1279         Data = 0x00;
1280         mos7840_set_uart_reg(port, INTERRUPT_ENABLE_REGISTER, Data);
1281
1282         mos7840_port->open = 0;
1283
1284         dbg("%s \n", "Leaving ............");
1285 }
1286
1287 /************************************************************************
1288  *
1289  * mos7840_block_until_chase_response
1290  *
1291  *      This function will block the close until one of the following:
1292  *              1. Response to our Chase comes from mos7840
1293  *              2. A timout of 10 seconds without activity has expired
1294  *                 (1K of mos7840 data @ 2400 baud ==> 4 sec to empty)
1295  *
1296  ************************************************************************/
1297
1298 static void mos7840_block_until_chase_response(struct moschip_port
1299                                                *mos7840_port)
1300 {
1301         int timeout = 1 * HZ;
1302         int wait = 10;
1303         int count;
1304
1305         while (1) {
1306                 count = mos7840_chars_in_buffer(mos7840_port->port);
1307
1308                 /* Check for Buffer status */
1309                 if (count <= 0) {
1310                         return;
1311                 }
1312
1313                 /* Block the thread for a while */
1314                 interruptible_sleep_on_timeout(&mos7840_port->wait_chase,
1315                                                timeout);
1316                 /* No activity.. count down section */
1317                 wait--;
1318                 if (wait == 0) {
1319                         dbg("%s - TIMEOUT", __FUNCTION__);
1320                         return;
1321                 } else {
1322                         /* Reset timout value back to seconds */
1323                         wait = 10;
1324                 }
1325         }
1326
1327 }
1328
1329 /*****************************************************************************
1330  * mos7840_break
1331  *      this function sends a break to the port
1332  *****************************************************************************/
1333 static void mos7840_break(struct usb_serial_port *port, int break_state)
1334 {
1335         unsigned char data;
1336         struct usb_serial *serial;
1337         struct moschip_port *mos7840_port;
1338
1339         dbg("%s \n", "Entering ...........");
1340         dbg("mos7840_break: Start\n");
1341
1342         if (mos7840_port_paranoia_check(port, __FUNCTION__)) {
1343                 dbg("%s", "Port Paranoia failed \n");
1344                 return;
1345         }
1346
1347         serial = mos7840_get_usb_serial(port, __FUNCTION__);
1348         if (!serial) {
1349                 dbg("%s", "Serial Paranoia failed \n");
1350                 return;
1351         }
1352
1353         mos7840_port = mos7840_get_port_private(port);
1354
1355         if (mos7840_port == NULL) {
1356                 return;
1357         }
1358
1359         if (serial->dev) {
1360
1361                 /* flush and block until tx is empty */
1362                 mos7840_block_until_chase_response(mos7840_port);
1363         }
1364
1365         if (break_state == -1) {
1366                 data = mos7840_port->shadowLCR | LCR_SET_BREAK;
1367         } else {
1368                 data = mos7840_port->shadowLCR & ~LCR_SET_BREAK;
1369         }
1370
1371         mos7840_port->shadowLCR = data;
1372         dbg("mcs7840_break mos7840_port->shadowLCR is %x\n",
1373             mos7840_port->shadowLCR);
1374         mos7840_set_uart_reg(port, LINE_CONTROL_REGISTER,
1375                              mos7840_port->shadowLCR);
1376
1377         return;
1378 }
1379
1380 /*****************************************************************************
1381  * mos7840_write_room
1382  *      this function is called by the tty driver when it wants to know how many
1383  *      bytes of data we can accept for a specific port.
1384  *      If successful, we return the amount of room that we have for this port
1385  *      Otherwise we return a negative error number.
1386  *****************************************************************************/
1387
1388 static int mos7840_write_room(struct usb_serial_port *port)
1389 {
1390         int i;
1391         int room = 0;
1392         unsigned long flags;
1393         struct moschip_port *mos7840_port;
1394
1395         dbg("%s \n", " mos7840_write_room:entering ...........");
1396
1397         if (mos7840_port_paranoia_check(port, __FUNCTION__)) {
1398                 dbg("%s", "Invalid port \n");
1399                 dbg("%s \n", " mos7840_write_room:leaving ...........");
1400                 return -1;
1401         }
1402
1403         mos7840_port = mos7840_get_port_private(port);
1404         if (mos7840_port == NULL) {
1405                 dbg("%s \n", "mos7840_break:leaving ...........");
1406                 return -1;
1407         }
1408
1409         spin_lock_irqsave(&mos7840_port->pool_lock, flags);
1410         for (i = 0; i < NUM_URBS; ++i) {
1411                 if (!mos7840_port->busy[i]) {
1412                         room += URB_TRANSFER_BUFFER_SIZE;
1413                 }
1414         }
1415         spin_unlock_irqrestore(&mos7840_port->pool_lock, flags);
1416
1417         room = (room == 0) ? 0 : room - URB_TRANSFER_BUFFER_SIZE + 1;
1418         dbg("%s - returns %d", __FUNCTION__, room);
1419         return room;
1420
1421 }
1422
1423 /*****************************************************************************
1424  * mos7840_write
1425  *      this function is called by the tty driver when data should be written to
1426  *      the port.
1427  *      If successful, we return the number of bytes written, otherwise we
1428  *      return a negative error number.
1429  *****************************************************************************/
1430
1431 static int mos7840_write(struct usb_serial_port *port,
1432                          const unsigned char *data, int count)
1433 {
1434         int status;
1435         int i;
1436         int bytes_sent = 0;
1437         int transfer_size;
1438         unsigned long flags;
1439
1440         struct moschip_port *mos7840_port;
1441         struct usb_serial *serial;
1442         struct urb *urb;
1443         //__u16 Data;
1444         const unsigned char *current_position = data;
1445         unsigned char *data1;
1446         dbg("%s \n", "entering ...........");
1447         //dbg("mos7840_write: mos7840_port->shadowLCR is %x\n",mos7840_port->shadowLCR);
1448
1449 #ifdef NOTMOS7840
1450         Data = 0x00;
1451         status = 0;
1452         status = mos7840_get_uart_reg(port, LINE_CONTROL_REGISTER, &Data);
1453         mos7840_port->shadowLCR = Data;
1454         dbg("mos7840_write: LINE_CONTROL_REGISTER is %x\n", Data);
1455         dbg("mos7840_write: mos7840_port->shadowLCR is %x\n",
1456             mos7840_port->shadowLCR);
1457
1458         //Data = 0x03;
1459         //status = mos7840_set_uart_reg(port,LINE_CONTROL_REGISTER,Data);
1460         //mos7840_port->shadowLCR=Data;//Need to add later
1461
1462         Data |= SERIAL_LCR_DLAB;        //data latch enable in LCR 0x80
1463         status = 0;
1464         status = mos7840_set_uart_reg(port, LINE_CONTROL_REGISTER, Data);
1465
1466         //Data = 0x0c;
1467         //status = mos7840_set_uart_reg(port,DIVISOR_LATCH_LSB,Data);
1468         Data = 0x00;
1469         status = 0;
1470         status = mos7840_get_uart_reg(port, DIVISOR_LATCH_LSB, &Data);
1471         dbg("mos7840_write:DLL value is %x\n", Data);
1472
1473         Data = 0x0;
1474         status = 0;
1475         status = mos7840_get_uart_reg(port, DIVISOR_LATCH_MSB, &Data);
1476         dbg("mos7840_write:DLM value is %x\n", Data);
1477
1478         Data = Data & ~SERIAL_LCR_DLAB;
1479         dbg("mos7840_write: mos7840_port->shadowLCR is %x\n",
1480             mos7840_port->shadowLCR);
1481         status = 0;
1482         status = mos7840_set_uart_reg(port, LINE_CONTROL_REGISTER, Data);
1483 #endif
1484
1485         if (mos7840_port_paranoia_check(port, __FUNCTION__)) {
1486                 dbg("%s", "Port Paranoia failed \n");
1487                 return -1;
1488         }
1489
1490         serial = port->serial;
1491         if (mos7840_serial_paranoia_check(serial, __FUNCTION__)) {
1492                 dbg("%s", "Serial Paranoia failed \n");
1493                 return -1;
1494         }
1495
1496         mos7840_port = mos7840_get_port_private(port);
1497         if (mos7840_port == NULL) {
1498                 dbg("%s", "mos7840_port is NULL\n");
1499                 return -1;
1500         }
1501
1502         /* try to find a free urb in the list */
1503         urb = NULL;
1504
1505         spin_lock_irqsave(&mos7840_port->pool_lock, flags);
1506         for (i = 0; i < NUM_URBS; ++i) {
1507                 if (!mos7840_port->busy[i]) {
1508                         mos7840_port->busy[i] = 1;
1509                         urb = mos7840_port->write_urb_pool[i];
1510                         dbg("\nURB:%d", i);
1511                         break;
1512                 }
1513         }
1514         spin_unlock_irqrestore(&mos7840_port->pool_lock, flags);
1515
1516         if (urb == NULL) {
1517                 dbg("%s - no more free urbs", __FUNCTION__);
1518                 goto exit;
1519         }
1520
1521         if (urb->transfer_buffer == NULL) {
1522                 urb->transfer_buffer =
1523                     kmalloc(URB_TRANSFER_BUFFER_SIZE, GFP_KERNEL);
1524
1525                 if (urb->transfer_buffer == NULL) {
1526                         err("%s no more kernel memory...", __FUNCTION__);
1527                         goto exit;
1528                 }
1529         }
1530         transfer_size = min(count, URB_TRANSFER_BUFFER_SIZE);
1531
1532         memcpy(urb->transfer_buffer, current_position, transfer_size);
1533
1534         /* fill urb with data and submit  */
1535         usb_fill_bulk_urb(urb,
1536                           serial->dev,
1537                           usb_sndbulkpipe(serial->dev,
1538                                           port->bulk_out_endpointAddress),
1539                           urb->transfer_buffer,
1540                           transfer_size,
1541                           mos7840_bulk_out_data_callback, mos7840_port);
1542
1543         data1 = urb->transfer_buffer;
1544         dbg("\nbulkout endpoint is %d", port->bulk_out_endpointAddress);
1545
1546         /* send it down the pipe */
1547         status = usb_submit_urb(urb, GFP_ATOMIC);
1548
1549         if (status) {
1550                 mos7840_port->busy[i] = 0;
1551                 err("%s - usb_submit_urb(write bulk) failed with status = %d",
1552                     __FUNCTION__, status);
1553                 bytes_sent = status;
1554                 goto exit;
1555         }
1556         bytes_sent = transfer_size;
1557         mos7840_port->icount.tx += transfer_size;
1558         smp_wmb();
1559         dbg("mos7840_port->icount.tx is %d:\n", mos7840_port->icount.tx);
1560       exit:
1561
1562         return bytes_sent;
1563
1564 }
1565
1566 /*****************************************************************************
1567  * mos7840_throttle
1568  *      this function is called by the tty driver when it wants to stop the data
1569  *      being read from the port.
1570  *****************************************************************************/
1571
1572 static void mos7840_throttle(struct usb_serial_port *port)
1573 {
1574         struct moschip_port *mos7840_port;
1575         struct tty_struct *tty;
1576         int status;
1577
1578         if (mos7840_port_paranoia_check(port, __FUNCTION__)) {
1579                 dbg("%s", "Invalid port \n");
1580                 return;
1581         }
1582
1583         dbg("- port %d\n", port->number);
1584
1585         mos7840_port = mos7840_get_port_private(port);
1586
1587         if (mos7840_port == NULL)
1588                 return;
1589
1590         if (!mos7840_port->open) {
1591                 dbg("%s\n", "port not opened");
1592                 return;
1593         }
1594
1595         dbg("%s", "Entering .......... \n");
1596
1597         tty = port->tty;
1598         if (!tty) {
1599                 dbg("%s - no tty available", __FUNCTION__);
1600                 return;
1601         }
1602
1603         /* if we are implementing XON/XOFF, send the stop character */
1604         if (I_IXOFF(tty)) {
1605                 unsigned char stop_char = STOP_CHAR(tty);
1606                 status = mos7840_write(port, &stop_char, 1);
1607                 if (status <= 0) {
1608                         return;
1609                 }
1610         }
1611
1612         /* if we are implementing RTS/CTS, toggle that line */
1613         if (tty->termios->c_cflag & CRTSCTS) {
1614                 mos7840_port->shadowMCR &= ~MCR_RTS;
1615                 status = 0;
1616                 status =
1617                     mos7840_set_uart_reg(port, MODEM_CONTROL_REGISTER,
1618                                          mos7840_port->shadowMCR);
1619
1620                 if (status < 0) {
1621                         return;
1622                 }
1623         }
1624
1625         return;
1626 }
1627
1628 /*****************************************************************************
1629  * mos7840_unthrottle
1630  *      this function is called by the tty driver when it wants to resume the data
1631  *      being read from the port (called after SerialThrottle is called)
1632  *****************************************************************************/
1633 static void mos7840_unthrottle(struct usb_serial_port *port)
1634 {
1635         struct tty_struct *tty;
1636         int status;
1637         struct moschip_port *mos7840_port = mos7840_get_port_private(port);
1638
1639         if (mos7840_port_paranoia_check(port, __FUNCTION__)) {
1640                 dbg("%s", "Invalid port \n");
1641                 return;
1642         }
1643
1644         if (mos7840_port == NULL)
1645                 return;
1646
1647         if (!mos7840_port->open) {
1648                 dbg("%s - port not opened", __FUNCTION__);
1649                 return;
1650         }
1651
1652         dbg("%s", "Entering .......... \n");
1653
1654         tty = port->tty;
1655         if (!tty) {
1656                 dbg("%s - no tty available", __FUNCTION__);
1657                 return;
1658         }
1659
1660         /* if we are implementing XON/XOFF, send the start character */
1661         if (I_IXOFF(tty)) {
1662                 unsigned char start_char = START_CHAR(tty);
1663                 status = mos7840_write(port, &start_char, 1);
1664                 if (status <= 0) {
1665                         return;
1666                 }
1667         }
1668
1669         /* if we are implementing RTS/CTS, toggle that line */
1670         if (tty->termios->c_cflag & CRTSCTS) {
1671                 mos7840_port->shadowMCR |= MCR_RTS;
1672                 status = 0;
1673                 status =
1674                     mos7840_set_uart_reg(port, MODEM_CONTROL_REGISTER,
1675                                          mos7840_port->shadowMCR);
1676                 if (status < 0) {
1677                         return;
1678                 }
1679         }
1680
1681         return;
1682 }
1683
1684 static int mos7840_tiocmget(struct usb_serial_port *port, struct file *file)
1685 {
1686         struct moschip_port *mos7840_port;
1687         unsigned int result;
1688         __u16 msr;
1689         __u16 mcr;
1690         int status = 0;
1691         mos7840_port = mos7840_get_port_private(port);
1692
1693         dbg("%s - port %d", __FUNCTION__, port->number);
1694
1695         if (mos7840_port == NULL)
1696                 return -ENODEV;
1697
1698         status = mos7840_get_uart_reg(port, MODEM_STATUS_REGISTER, &msr);
1699         status = mos7840_get_uart_reg(port, MODEM_CONTROL_REGISTER, &mcr);
1700         result = ((mcr & MCR_DTR) ? TIOCM_DTR : 0)
1701             | ((mcr & MCR_RTS) ? TIOCM_RTS : 0)
1702             | ((mcr & MCR_LOOPBACK) ? TIOCM_LOOP : 0)
1703             | ((msr & MOS7840_MSR_CTS) ? TIOCM_CTS : 0)
1704             | ((msr & MOS7840_MSR_CD) ? TIOCM_CAR : 0)
1705             | ((msr & MOS7840_MSR_RI) ? TIOCM_RI : 0)
1706             | ((msr & MOS7840_MSR_DSR) ? TIOCM_DSR : 0);
1707
1708         dbg("%s - 0x%04X", __FUNCTION__, result);
1709
1710         return result;
1711 }
1712
1713 static int mos7840_tiocmset(struct usb_serial_port *port, struct file *file,
1714                             unsigned int set, unsigned int clear)
1715 {
1716         struct moschip_port *mos7840_port;
1717         unsigned int mcr;
1718         unsigned int status;
1719
1720         dbg("%s - port %d", __FUNCTION__, port->number);
1721
1722         mos7840_port = mos7840_get_port_private(port);
1723
1724         if (mos7840_port == NULL)
1725                 return -ENODEV;
1726
1727         mcr = mos7840_port->shadowMCR;
1728         if (clear & TIOCM_RTS)
1729                 mcr &= ~MCR_RTS;
1730         if (clear & TIOCM_DTR)
1731                 mcr &= ~MCR_DTR;
1732         if (clear & TIOCM_LOOP)
1733                 mcr &= ~MCR_LOOPBACK;
1734
1735         if (set & TIOCM_RTS)
1736                 mcr |= MCR_RTS;
1737         if (set & TIOCM_DTR)
1738                 mcr |= MCR_DTR;
1739         if (set & TIOCM_LOOP)
1740                 mcr |= MCR_LOOPBACK;
1741
1742         mos7840_port->shadowMCR = mcr;
1743
1744         status = 0;
1745         status = mos7840_set_uart_reg(port, MODEM_CONTROL_REGISTER, mcr);
1746         if (status < 0) {
1747                 dbg("setting MODEM_CONTROL_REGISTER Failed\n");
1748                 return -1;
1749         }
1750
1751         return 0;
1752 }
1753
1754 /*****************************************************************************
1755  * mos7840_calc_baud_rate_divisor
1756  *      this function calculates the proper baud rate divisor for the specified
1757  *      baud rate.
1758  *****************************************************************************/
1759 static int mos7840_calc_baud_rate_divisor(int baudRate, int *divisor,
1760                                           __u16 * clk_sel_val)
1761 {
1762
1763         dbg("%s - %d", __FUNCTION__, baudRate);
1764
1765         if (baudRate <= 115200) {
1766                 *divisor = 115200 / baudRate;
1767                 *clk_sel_val = 0x0;
1768         }
1769         if ((baudRate > 115200) && (baudRate <= 230400)) {
1770                 *divisor = 230400 / baudRate;
1771                 *clk_sel_val = 0x10;
1772         } else if ((baudRate > 230400) && (baudRate <= 403200)) {
1773                 *divisor = 403200 / baudRate;
1774                 *clk_sel_val = 0x20;
1775         } else if ((baudRate > 403200) && (baudRate <= 460800)) {
1776                 *divisor = 460800 / baudRate;
1777                 *clk_sel_val = 0x30;
1778         } else if ((baudRate > 460800) && (baudRate <= 806400)) {
1779                 *divisor = 806400 / baudRate;
1780                 *clk_sel_val = 0x40;
1781         } else if ((baudRate > 806400) && (baudRate <= 921600)) {
1782                 *divisor = 921600 / baudRate;
1783                 *clk_sel_val = 0x50;
1784         } else if ((baudRate > 921600) && (baudRate <= 1572864)) {
1785                 *divisor = 1572864 / baudRate;
1786                 *clk_sel_val = 0x60;
1787         } else if ((baudRate > 1572864) && (baudRate <= 3145728)) {
1788                 *divisor = 3145728 / baudRate;
1789                 *clk_sel_val = 0x70;
1790         }
1791         return 0;
1792
1793 #ifdef NOTMCS7840
1794
1795         for (i = 0; i < ARRAY_SIZE(mos7840_divisor_table); i++) {
1796                 if (mos7840_divisor_table[i].BaudRate == baudrate) {
1797                         *divisor = mos7840_divisor_table[i].Divisor;
1798                         return 0;
1799                 }
1800         }
1801
1802         /* After trying for all the standard baud rates    *
1803          * Try calculating the divisor for this baud rate  */
1804
1805         if (baudrate > 75 && baudrate < 230400) {
1806                 /* get the divisor */
1807                 custom = (__u16) (230400L / baudrate);
1808
1809                 /* Check for round off */
1810                 round1 = (__u16) (2304000L / baudrate);
1811                 round = (__u16) (round1 - (custom * 10));
1812                 if (round > 4) {
1813                         custom++;
1814                 }
1815                 *divisor = custom;
1816
1817                 dbg(" Baud %d = %d\n", baudrate, custom);
1818                 return 0;
1819         }
1820
1821         dbg("%s\n", " Baud calculation Failed...");
1822         return -1;
1823 #endif
1824 }
1825
1826 /*****************************************************************************
1827  * mos7840_send_cmd_write_baud_rate
1828  *      this function sends the proper command to change the baud rate of the
1829  *      specified port.
1830  *****************************************************************************/
1831
1832 static int mos7840_send_cmd_write_baud_rate(struct moschip_port *mos7840_port,
1833                                             int baudRate)
1834 {
1835         int divisor = 0;
1836         int status;
1837         __u16 Data;
1838         unsigned char number;
1839         __u16 clk_sel_val;
1840         struct usb_serial_port *port;
1841
1842         if (mos7840_port == NULL)
1843                 return -1;
1844
1845         port = (struct usb_serial_port *)mos7840_port->port;
1846         if (mos7840_port_paranoia_check(port, __FUNCTION__)) {
1847                 dbg("%s", "Invalid port \n");
1848                 return -1;
1849         }
1850
1851         if (mos7840_serial_paranoia_check(port->serial, __FUNCTION__)) {
1852                 dbg("%s", "Invalid Serial \n");
1853                 return -1;
1854         }
1855
1856         dbg("%s", "Entering .......... \n");
1857
1858         number = mos7840_port->port->number - mos7840_port->port->serial->minor;
1859
1860         dbg("%s - port = %d, baud = %d", __FUNCTION__,
1861             mos7840_port->port->number, baudRate);
1862         //reset clk_uart_sel in spregOffset
1863         if (baudRate > 115200) {
1864 #ifdef HW_flow_control
1865                 //NOTE: need to see the pther register to modify
1866                 //setting h/w flow control bit to 1;
1867                 status = 0;
1868                 Data = 0x2b;
1869                 mos7840_port->shadowMCR = Data;
1870                 status =
1871                     mos7840_set_uart_reg(port, MODEM_CONTROL_REGISTER, Data);
1872                 if (status < 0) {
1873                         dbg("Writing spreg failed in set_serial_baud\n");
1874                         return -1;
1875                 }
1876 #endif
1877
1878         } else {
1879 #ifdef HW_flow_control
1880                 //setting h/w flow control bit to 0;
1881                 status = 0;
1882                 Data = 0xb;
1883                 mos7840_port->shadowMCR = Data;
1884                 status =
1885                     mos7840_set_uart_reg(port, MODEM_CONTROL_REGISTER, Data);
1886                 if (status < 0) {
1887                         dbg("Writing spreg failed in set_serial_baud\n");
1888                         return -1;
1889                 }
1890 #endif
1891
1892         }
1893
1894         if (1)                  //baudRate <= 115200)
1895         {
1896                 clk_sel_val = 0x0;
1897                 Data = 0x0;
1898                 status = 0;
1899                 status =
1900                     mos7840_calc_baud_rate_divisor(baudRate, &divisor,
1901                                                    &clk_sel_val);
1902                 status =
1903                     mos7840_get_reg_sync(port, mos7840_port->SpRegOffset,
1904                                          &Data);
1905                 if (status < 0) {
1906                         dbg("reading spreg failed in set_serial_baud\n");
1907                         return -1;
1908                 }
1909                 Data = (Data & 0x8f) | clk_sel_val;
1910                 status = 0;
1911                 status =
1912                     mos7840_set_reg_sync(port, mos7840_port->SpRegOffset, Data);
1913                 if (status < 0) {
1914                         dbg("Writing spreg failed in set_serial_baud\n");
1915                         return -1;
1916                 }
1917                 /* Calculate the Divisor */
1918
1919                 if (status) {
1920                         err("%s - bad baud rate", __FUNCTION__);
1921                         dbg("%s\n", "bad baud rate");
1922                         return status;
1923                 }
1924                 /* Enable access to divisor latch */
1925                 Data = mos7840_port->shadowLCR | SERIAL_LCR_DLAB;
1926                 mos7840_port->shadowLCR = Data;
1927                 mos7840_set_uart_reg(port, LINE_CONTROL_REGISTER, Data);
1928
1929                 /* Write the divisor */
1930                 Data = (unsigned char)(divisor & 0xff);
1931                 dbg("set_serial_baud Value to write DLL is %x\n", Data);
1932                 mos7840_set_uart_reg(port, DIVISOR_LATCH_LSB, Data);
1933
1934                 Data = (unsigned char)((divisor & 0xff00) >> 8);
1935                 dbg("set_serial_baud Value to write DLM is %x\n", Data);
1936                 mos7840_set_uart_reg(port, DIVISOR_LATCH_MSB, Data);
1937
1938                 /* Disable access to divisor latch */
1939                 Data = mos7840_port->shadowLCR & ~SERIAL_LCR_DLAB;
1940                 mos7840_port->shadowLCR = Data;
1941                 mos7840_set_uart_reg(port, LINE_CONTROL_REGISTER, Data);
1942
1943         }
1944
1945         return status;
1946 }
1947
1948 /*****************************************************************************
1949  * mos7840_change_port_settings
1950  *      This routine is called to set the UART on the device to match
1951  *      the specified new settings.
1952  *****************************************************************************/
1953
1954 static void mos7840_change_port_settings(struct moschip_port *mos7840_port,
1955                                          struct ktermios *old_termios)
1956 {
1957         struct tty_struct *tty;
1958         int baud;
1959         unsigned cflag;
1960         unsigned iflag;
1961         __u8 lData;
1962         __u8 lParity;
1963         __u8 lStop;
1964         int status;
1965         __u16 Data;
1966         struct usb_serial_port *port;
1967         struct usb_serial *serial;
1968
1969         if (mos7840_port == NULL)
1970                 return;
1971
1972         port = (struct usb_serial_port *)mos7840_port->port;
1973
1974         if (mos7840_port_paranoia_check(port, __FUNCTION__)) {
1975                 dbg("%s", "Invalid port \n");
1976                 return;
1977         }
1978
1979         if (mos7840_serial_paranoia_check(port->serial, __FUNCTION__)) {
1980                 dbg("%s", "Invalid Serial \n");
1981                 return;
1982         }
1983
1984         serial = port->serial;
1985
1986         dbg("%s - port %d", __FUNCTION__, mos7840_port->port->number);
1987
1988         if (!mos7840_port->open) {
1989                 dbg("%s - port not opened", __FUNCTION__);
1990                 return;
1991         }
1992
1993         tty = mos7840_port->port->tty;
1994
1995         if ((!tty) || (!tty->termios)) {
1996                 dbg("%s - no tty structures", __FUNCTION__);
1997                 return;
1998         }
1999
2000         dbg("%s", "Entering .......... \n");
2001
2002         lData = LCR_BITS_8;
2003         lStop = LCR_STOP_1;
2004         lParity = LCR_PAR_NONE;
2005
2006         cflag = tty->termios->c_cflag;
2007         iflag = tty->termios->c_iflag;
2008
2009         /* Change the number of bits */
2010         if (cflag & CSIZE) {
2011                 switch (cflag & CSIZE) {
2012                 case CS5:
2013                         lData = LCR_BITS_5;
2014                         break;
2015
2016                 case CS6:
2017                         lData = LCR_BITS_6;
2018                         break;
2019
2020                 case CS7:
2021                         lData = LCR_BITS_7;
2022                         break;
2023                 default:
2024                 case CS8:
2025                         lData = LCR_BITS_8;
2026                         break;
2027                 }
2028         }
2029         /* Change the Parity bit */
2030         if (cflag & PARENB) {
2031                 if (cflag & PARODD) {
2032                         lParity = LCR_PAR_ODD;
2033                         dbg("%s - parity = odd", __FUNCTION__);
2034                 } else {
2035                         lParity = LCR_PAR_EVEN;
2036                         dbg("%s - parity = even", __FUNCTION__);
2037                 }
2038
2039         } else {
2040                 dbg("%s - parity = none", __FUNCTION__);
2041         }
2042
2043         if (cflag & CMSPAR) {
2044                 lParity = lParity | 0x20;
2045         }
2046
2047         /* Change the Stop bit */
2048         if (cflag & CSTOPB) {
2049                 lStop = LCR_STOP_2;
2050                 dbg("%s - stop bits = 2", __FUNCTION__);
2051         } else {
2052                 lStop = LCR_STOP_1;
2053                 dbg("%s - stop bits = 1", __FUNCTION__);
2054         }
2055
2056         /* Update the LCR with the correct value */
2057         mos7840_port->shadowLCR &=
2058             ~(LCR_BITS_MASK | LCR_STOP_MASK | LCR_PAR_MASK);
2059         mos7840_port->shadowLCR |= (lData | lParity | lStop);
2060
2061         dbg("mos7840_change_port_settings mos7840_port->shadowLCR is %x\n",
2062             mos7840_port->shadowLCR);
2063         /* Disable Interrupts */
2064         Data = 0x00;
2065         mos7840_set_uart_reg(port, INTERRUPT_ENABLE_REGISTER, Data);
2066
2067         Data = 0x00;
2068         mos7840_set_uart_reg(port, FIFO_CONTROL_REGISTER, Data);
2069
2070         Data = 0xcf;
2071         mos7840_set_uart_reg(port, FIFO_CONTROL_REGISTER, Data);
2072
2073         /* Send the updated LCR value to the mos7840 */
2074         Data = mos7840_port->shadowLCR;
2075
2076         mos7840_set_uart_reg(port, LINE_CONTROL_REGISTER, Data);
2077
2078         Data = 0x00b;
2079         mos7840_port->shadowMCR = Data;
2080         mos7840_set_uart_reg(port, MODEM_CONTROL_REGISTER, Data);
2081         Data = 0x00b;
2082         mos7840_set_uart_reg(port, MODEM_CONTROL_REGISTER, Data);
2083
2084         /* set up the MCR register and send it to the mos7840 */
2085
2086         mos7840_port->shadowMCR = MCR_MASTER_IE;
2087         if (cflag & CBAUD) {
2088                 mos7840_port->shadowMCR |= (MCR_DTR | MCR_RTS);
2089         }
2090
2091         if (cflag & CRTSCTS) {
2092                 mos7840_port->shadowMCR |= (MCR_XON_ANY);
2093
2094         } else {
2095                 mos7840_port->shadowMCR &= ~(MCR_XON_ANY);
2096         }
2097
2098         Data = mos7840_port->shadowMCR;
2099         mos7840_set_uart_reg(port, MODEM_CONTROL_REGISTER, Data);
2100
2101         /* Determine divisor based on baud rate */
2102         baud = tty_get_baud_rate(tty);
2103
2104         if (!baud) {
2105                 /* pick a default, any default... */
2106                 dbg("%s\n", "Picked default baud...");
2107                 baud = 9600;
2108         }
2109
2110         dbg("%s - baud rate = %d", __FUNCTION__, baud);
2111         status = mos7840_send_cmd_write_baud_rate(mos7840_port, baud);
2112
2113         /* Enable Interrupts */
2114         Data = 0x0c;
2115         mos7840_set_uart_reg(port, INTERRUPT_ENABLE_REGISTER, Data);
2116
2117         if (mos7840_port->read_urb->status != -EINPROGRESS) {
2118                 mos7840_port->read_urb->dev = serial->dev;
2119
2120                 status = usb_submit_urb(mos7840_port->read_urb, GFP_ATOMIC);
2121
2122                 if (status) {
2123                         dbg(" usb_submit_urb(read bulk) failed, status = %d",
2124                             status);
2125                 }
2126         }
2127         wake_up(&mos7840_port->delta_msr_wait);
2128         mos7840_port->delta_msr_cond = 1;
2129         dbg("mos7840_change_port_settings mos7840_port->shadowLCR is End %x\n",
2130             mos7840_port->shadowLCR);
2131
2132         return;
2133 }
2134
2135 /*****************************************************************************
2136  * mos7840_set_termios
2137  *      this function is called by the tty driver when it wants to change
2138  *      the termios structure
2139  *****************************************************************************/
2140
2141 static void mos7840_set_termios(struct usb_serial_port *port,
2142                                 struct ktermios *old_termios)
2143 {
2144         int status;
2145         unsigned int cflag;
2146         struct usb_serial *serial;
2147         struct moschip_port *mos7840_port;
2148         struct tty_struct *tty;
2149         dbg("mos7840_set_termios: START\n");
2150         if (mos7840_port_paranoia_check(port, __FUNCTION__)) {
2151                 dbg("%s", "Invalid port \n");
2152                 return;
2153         }
2154
2155         serial = port->serial;
2156
2157         if (mos7840_serial_paranoia_check(serial, __FUNCTION__)) {
2158                 dbg("%s", "Invalid Serial \n");
2159                 return;
2160         }
2161
2162         mos7840_port = mos7840_get_port_private(port);
2163
2164         if (mos7840_port == NULL)
2165                 return;
2166
2167         tty = port->tty;
2168
2169         if (!port->tty || !port->tty->termios) {
2170                 dbg("%s - no tty or termios", __FUNCTION__);
2171                 return;
2172         }
2173
2174         if (!mos7840_port->open) {
2175                 dbg("%s - port not opened", __FUNCTION__);
2176                 return;
2177         }
2178
2179         dbg("%s\n", "setting termios - ");
2180
2181         cflag = tty->termios->c_cflag;
2182
2183         if (!cflag) {
2184                 dbg("%s %s\n", __FUNCTION__, "cflag is NULL");
2185                 return;
2186         }
2187
2188         /* check that they really want us to change something */
2189         if (old_termios) {
2190                 if ((cflag == old_termios->c_cflag) &&
2191                     (RELEVANT_IFLAG(tty->termios->c_iflag) ==
2192                      RELEVANT_IFLAG(old_termios->c_iflag))) {
2193                         dbg("%s\n", "Nothing to change");
2194                         return;
2195                 }
2196         }
2197
2198         dbg("%s - clfag %08x iflag %08x", __FUNCTION__,
2199             tty->termios->c_cflag, RELEVANT_IFLAG(tty->termios->c_iflag));
2200
2201         if (old_termios) {
2202                 dbg("%s - old clfag %08x old iflag %08x", __FUNCTION__,
2203                     old_termios->c_cflag, RELEVANT_IFLAG(old_termios->c_iflag));
2204         }
2205
2206         dbg("%s - port %d", __FUNCTION__, port->number);
2207
2208         /* change the port settings to the new ones specified */
2209
2210         mos7840_change_port_settings(mos7840_port, old_termios);
2211
2212         if (!mos7840_port->read_urb) {
2213                 dbg("%s", "URB KILLED !!!!!\n");
2214                 return;
2215         }
2216
2217         if (mos7840_port->read_urb->status != -EINPROGRESS) {
2218                 mos7840_port->read_urb->dev = serial->dev;
2219                 status = usb_submit_urb(mos7840_port->read_urb, GFP_ATOMIC);
2220                 if (status) {
2221                         dbg(" usb_submit_urb(read bulk) failed, status = %d",
2222                             status);
2223                 }
2224         }
2225         return;
2226 }
2227
2228 /*****************************************************************************
2229  * mos7840_get_lsr_info - get line status register info
2230  *
2231  * Purpose: Let user call ioctl() to get info when the UART physically
2232  *          is emptied.  On bus types like RS485, the transmitter must
2233  *          release the bus after transmitting. This must be done when
2234  *          the transmit shift register is empty, not be done when the
2235  *          transmit holding register is empty.  This functionality
2236  *          allows an RS485 driver to be written in user space.
2237  *****************************************************************************/
2238
2239 static int mos7840_get_lsr_info(struct moschip_port *mos7840_port,
2240                                 unsigned int __user *value)
2241 {
2242         int count;
2243         unsigned int result = 0;
2244
2245         count = mos7840_chars_in_buffer(mos7840_port->port);
2246         if (count == 0) {
2247                 dbg("%s -- Empty", __FUNCTION__);
2248                 result = TIOCSER_TEMT;
2249         }
2250
2251         if (copy_to_user(value, &result, sizeof(int)))
2252                 return -EFAULT;
2253         return 0;
2254 }
2255
2256 /*****************************************************************************
2257  * mos7840_get_bytes_avail - get number of bytes available
2258  *
2259  * Purpose: Let user call ioctl to get the count of number of bytes available.
2260  *****************************************************************************/
2261
2262 static int mos7840_get_bytes_avail(struct moschip_port *mos7840_port,
2263                                    unsigned int __user *value)
2264 {
2265         unsigned int result = 0;
2266         struct tty_struct *tty = mos7840_port->port->tty;
2267
2268         if (!tty)
2269                 return -ENOIOCTLCMD;
2270
2271         result = tty->read_cnt;
2272
2273         dbg("%s(%d) = %d", __FUNCTION__, mos7840_port->port->number, result);
2274         if (copy_to_user(value, &result, sizeof(int)))
2275                 return -EFAULT;
2276
2277         return -ENOIOCTLCMD;
2278 }
2279
2280 /*****************************************************************************
2281  * mos7840_set_modem_info
2282  *      function to set modem info
2283  *****************************************************************************/
2284
2285 static int mos7840_set_modem_info(struct moschip_port *mos7840_port,
2286                                   unsigned int cmd, unsigned int __user *value)
2287 {
2288         unsigned int mcr;
2289         unsigned int arg;
2290         __u16 Data;
2291         int status;
2292         struct usb_serial_port *port;
2293
2294         if (mos7840_port == NULL)
2295                 return -1;
2296
2297         port = (struct usb_serial_port *)mos7840_port->port;
2298         if (mos7840_port_paranoia_check(port, __FUNCTION__)) {
2299                 dbg("%s", "Invalid port \n");
2300                 return -1;
2301         }
2302
2303         mcr = mos7840_port->shadowMCR;
2304
2305         if (copy_from_user(&arg, value, sizeof(int)))
2306                 return -EFAULT;
2307
2308         switch (cmd) {
2309         case TIOCMBIS:
2310                 if (arg & TIOCM_RTS)
2311                         mcr |= MCR_RTS;
2312                 if (arg & TIOCM_DTR)
2313                         mcr |= MCR_RTS;
2314                 if (arg & TIOCM_LOOP)
2315                         mcr |= MCR_LOOPBACK;
2316                 break;
2317
2318         case TIOCMBIC:
2319                 if (arg & TIOCM_RTS)
2320                         mcr &= ~MCR_RTS;
2321                 if (arg & TIOCM_DTR)
2322                         mcr &= ~MCR_RTS;
2323                 if (arg & TIOCM_LOOP)
2324                         mcr &= ~MCR_LOOPBACK;
2325                 break;
2326
2327         case TIOCMSET:
2328                 /* turn off the RTS and DTR and LOOPBACK
2329                  * and then only turn on what was asked to */
2330                 mcr &= ~(MCR_RTS | MCR_DTR | MCR_LOOPBACK);
2331                 mcr |= ((arg & TIOCM_RTS) ? MCR_RTS : 0);
2332                 mcr |= ((arg & TIOCM_DTR) ? MCR_DTR : 0);
2333                 mcr |= ((arg & TIOCM_LOOP) ? MCR_LOOPBACK : 0);
2334                 break;
2335         }
2336
2337         mos7840_port->shadowMCR = mcr;
2338
2339         Data = mos7840_port->shadowMCR;
2340         status = 0;
2341         status = mos7840_set_uart_reg(port, MODEM_CONTROL_REGISTER, Data);
2342         if (status < 0) {
2343                 dbg("setting MODEM_CONTROL_REGISTER Failed\n");
2344                 return -1;
2345         }
2346
2347         return 0;
2348 }
2349
2350 /*****************************************************************************
2351  * mos7840_get_modem_info
2352  *      function to get modem info
2353  *****************************************************************************/
2354
2355 static int mos7840_get_modem_info(struct moschip_port *mos7840_port,
2356                                   unsigned int __user *value)
2357 {
2358         unsigned int result = 0;
2359         __u16 msr;
2360         unsigned int mcr = mos7840_port->shadowMCR;
2361         int status = 0;
2362         status =
2363             mos7840_get_uart_reg(mos7840_port->port, MODEM_STATUS_REGISTER,
2364                                  &msr);
2365         result = ((mcr & MCR_DTR) ? TIOCM_DTR : 0)      /* 0x002 */
2366             |((mcr & MCR_RTS) ? TIOCM_RTS : 0)  /* 0x004 */
2367             |((msr & MOS7840_MSR_CTS) ? TIOCM_CTS : 0)  /* 0x020 */
2368             |((msr & MOS7840_MSR_CD) ? TIOCM_CAR : 0)   /* 0x040 */
2369             |((msr & MOS7840_MSR_RI) ? TIOCM_RI : 0)    /* 0x080 */
2370             |((msr & MOS7840_MSR_DSR) ? TIOCM_DSR : 0); /* 0x100 */
2371
2372         dbg("%s -- %x", __FUNCTION__, result);
2373
2374         if (copy_to_user(value, &result, sizeof(int)))
2375                 return -EFAULT;
2376         return 0;
2377 }
2378
2379 /*****************************************************************************
2380  * mos7840_get_serial_info
2381  *      function to get information about serial port
2382  *****************************************************************************/
2383
2384 static int mos7840_get_serial_info(struct moschip_port *mos7840_port,
2385                                    struct serial_struct __user *retinfo)
2386 {
2387         struct serial_struct tmp;
2388
2389         if (mos7840_port == NULL)
2390                 return -1;
2391
2392         if (!retinfo)
2393                 return -EFAULT;
2394
2395         memset(&tmp, 0, sizeof(tmp));
2396
2397         tmp.type = PORT_16550A;
2398         tmp.line = mos7840_port->port->serial->minor;
2399         tmp.port = mos7840_port->port->number;
2400         tmp.irq = 0;
2401         tmp.flags = ASYNC_SKIP_TEST | ASYNC_AUTO_IRQ;
2402         tmp.xmit_fifo_size = NUM_URBS * URB_TRANSFER_BUFFER_SIZE;
2403         tmp.baud_base = 9600;
2404         tmp.close_delay = 5 * HZ;
2405         tmp.closing_wait = 30 * HZ;
2406
2407         if (copy_to_user(retinfo, &tmp, sizeof(*retinfo)))
2408                 return -EFAULT;
2409         return 0;
2410 }
2411
2412 /*****************************************************************************
2413  * SerialIoctl
2414  *      this function handles any ioctl calls to the driver
2415  *****************************************************************************/
2416
2417 static int mos7840_ioctl(struct usb_serial_port *port, struct file *file,
2418                          unsigned int cmd, unsigned long arg)
2419 {
2420         void __user *argp = (void __user *)arg;
2421         struct moschip_port *mos7840_port;
2422         struct tty_struct *tty;
2423
2424         struct async_icount cnow;
2425         struct async_icount cprev;
2426         struct serial_icounter_struct icount;
2427         int mosret = 0;
2428         int retval;
2429         struct tty_ldisc *ld;
2430
2431         if (mos7840_port_paranoia_check(port, __FUNCTION__)) {
2432                 dbg("%s", "Invalid port \n");
2433                 return -1;
2434         }
2435
2436         mos7840_port = mos7840_get_port_private(port);
2437
2438         if (mos7840_port == NULL)
2439                 return -1;
2440
2441         tty = mos7840_port->port->tty;
2442
2443         dbg("%s - port %d, cmd = 0x%x", __FUNCTION__, port->number, cmd);
2444
2445         switch (cmd) {
2446                 /* return number of bytes available */
2447
2448         case TIOCINQ:
2449                 dbg("%s (%d) TIOCINQ", __FUNCTION__, port->number);
2450                 return mos7840_get_bytes_avail(mos7840_port, argp);
2451
2452         case TIOCOUTQ:
2453                 dbg("%s (%d) TIOCOUTQ", __FUNCTION__, port->number);
2454                 return put_user(tty->driver->chars_in_buffer ?
2455                                 tty->driver->chars_in_buffer(tty) : 0,
2456                                 (int __user *)arg);
2457
2458         case TCFLSH:
2459                 retval = tty_check_change(tty);
2460                 if (retval)
2461                         return retval;
2462
2463                 ld = tty_ldisc_ref(tty);
2464                 switch (arg) {
2465                 case TCIFLUSH:
2466                         if (ld && ld->flush_buffer)
2467                                 ld->flush_buffer(tty);
2468                         break;
2469                 case TCIOFLUSH:
2470                         if (ld && ld->flush_buffer)
2471                                 ld->flush_buffer(tty);
2472                         /* fall through */
2473                 case TCOFLUSH:
2474                         if (tty->driver->flush_buffer)
2475                                 tty->driver->flush_buffer(tty);
2476                         break;
2477                 default:
2478                         tty_ldisc_deref(ld);
2479                         return -EINVAL;
2480                 }
2481                 tty_ldisc_deref(ld);
2482                 return 0;
2483
2484         case TIOCSERGETLSR:
2485                 dbg("%s (%d) TIOCSERGETLSR", __FUNCTION__, port->number);
2486                 return mos7840_get_lsr_info(mos7840_port, argp);
2487                 return 0;
2488
2489         case TIOCMBIS:
2490         case TIOCMBIC:
2491         case TIOCMSET:
2492                 dbg("%s (%d) TIOCMSET/TIOCMBIC/TIOCMSET", __FUNCTION__,
2493                     port->number);
2494                 mosret =
2495                     mos7840_set_modem_info(mos7840_port, cmd, argp);
2496                 return mosret;
2497
2498         case TIOCMGET:
2499                 dbg("%s (%d) TIOCMGET", __FUNCTION__, port->number);
2500                 return mos7840_get_modem_info(mos7840_port, argp);
2501
2502         case TIOCGSERIAL:
2503                 dbg("%s (%d) TIOCGSERIAL", __FUNCTION__, port->number);
2504                 return mos7840_get_serial_info(mos7840_port, argp);
2505
2506         case TIOCSSERIAL:
2507                 dbg("%s (%d) TIOCSSERIAL", __FUNCTION__, port->number);
2508                 break;
2509
2510         case TIOCMIWAIT:
2511                 dbg("%s (%d) TIOCMIWAIT", __FUNCTION__, port->number);
2512                 cprev = mos7840_port->icount;
2513                 while (1) {
2514                         //interruptible_sleep_on(&mos7840_port->delta_msr_wait);
2515                         mos7840_port->delta_msr_cond = 0;
2516                         wait_event_interruptible(mos7840_port->delta_msr_wait,
2517                                                  (mos7840_port->
2518                                                   delta_msr_cond == 1));
2519
2520                         /* see if a signal did it */
2521                         if (signal_pending(current))
2522                                 return -ERESTARTSYS;
2523                         cnow = mos7840_port->icount;
2524                         smp_rmb();
2525                         if (cnow.rng == cprev.rng && cnow.dsr == cprev.dsr &&
2526                             cnow.dcd == cprev.dcd && cnow.cts == cprev.cts)
2527                                 return -EIO;    /* no change => error */
2528                         if (((arg & TIOCM_RNG) && (cnow.rng != cprev.rng)) ||
2529                             ((arg & TIOCM_DSR) && (cnow.dsr != cprev.dsr)) ||
2530                             ((arg & TIOCM_CD) && (cnow.dcd != cprev.dcd)) ||
2531                             ((arg & TIOCM_CTS) && (cnow.cts != cprev.cts))) {
2532                                 return 0;
2533                         }
2534                         cprev = cnow;
2535                 }
2536                 /* NOTREACHED */
2537                 break;
2538
2539         case TIOCGICOUNT:
2540                 cnow = mos7840_port->icount;
2541                 smp_rmb();
2542                 icount.cts = cnow.cts;
2543                 icount.dsr = cnow.dsr;
2544                 icount.rng = cnow.rng;
2545                 icount.dcd = cnow.dcd;
2546                 icount.rx = cnow.rx;
2547                 icount.tx = cnow.tx;
2548                 icount.frame = cnow.frame;
2549                 icount.overrun = cnow.overrun;
2550                 icount.parity = cnow.parity;
2551                 icount.brk = cnow.brk;
2552                 icount.buf_overrun = cnow.buf_overrun;
2553
2554                 dbg("%s (%d) TIOCGICOUNT RX=%d, TX=%d", __FUNCTION__,
2555                     port->number, icount.rx, icount.tx);
2556                 if (copy_to_user(argp, &icount, sizeof(icount)))
2557                         return -EFAULT;
2558                 return 0;
2559
2560         case TIOCEXBAUD:
2561                 return 0;
2562         default:
2563                 break;
2564         }
2565
2566         return -ENOIOCTLCMD;
2567 }
2568
2569 static int mos7840_calc_num_ports(struct usb_serial *serial)
2570 {
2571         int mos7840_num_ports = 0;
2572
2573         dbg("numberofendpoints: %d \n",
2574             (int)serial->interface->cur_altsetting->desc.bNumEndpoints);
2575         dbg("numberofendpoints: %d \n",
2576             (int)serial->interface->altsetting->desc.bNumEndpoints);
2577         if (serial->interface->cur_altsetting->desc.bNumEndpoints == 5) {
2578                 mos7840_num_ports = serial->num_ports = 2;
2579         } else if (serial->interface->cur_altsetting->desc.bNumEndpoints == 9) {
2580                 serial->num_bulk_in = 4;
2581                 serial->num_bulk_out = 4;
2582                 mos7840_num_ports = serial->num_ports = 4;
2583         }
2584
2585         return mos7840_num_ports;
2586 }
2587
2588 /****************************************************************************
2589  * mos7840_startup
2590  ****************************************************************************/
2591
2592 static int mos7840_startup(struct usb_serial *serial)
2593 {
2594         struct moschip_port *mos7840_port;
2595         struct usb_device *dev;
2596         int i, status;
2597
2598         __u16 Data;
2599         dbg("%s \n", " mos7840_startup :entering..........");
2600
2601         if (!serial) {
2602                 dbg("%s\n", "Invalid Handler");
2603                 return -1;
2604         }
2605
2606         dev = serial->dev;
2607
2608         dbg("%s\n", "Entering...");
2609
2610         /* we set up the pointers to the endpoints in the mos7840_open *
2611          * function, as the structures aren't created yet.             */
2612
2613         /* set up port private structures */
2614         for (i = 0; i < serial->num_ports; ++i) {
2615                 mos7840_port = kzalloc(sizeof(struct moschip_port), GFP_KERNEL);
2616                 if (mos7840_port == NULL) {
2617                         err("%s - Out of memory", __FUNCTION__);
2618                         status = -ENOMEM;
2619                         i--; /* don't follow NULL pointer cleaning up */
2620                         goto error;
2621                 }
2622
2623                 /* Initialize all port interrupt end point to port 0 int endpoint *
2624                  * Our device has only one interrupt end point comman to all port */
2625
2626                 mos7840_port->port = serial->port[i];
2627                 mos7840_set_port_private(serial->port[i], mos7840_port);
2628                 spin_lock_init(&mos7840_port->pool_lock);
2629
2630                 mos7840_port->port_num = ((serial->port[i]->number -
2631                                            (serial->port[i]->serial->minor)) +
2632                                           1);
2633
2634                 if (mos7840_port->port_num == 1) {
2635                         mos7840_port->SpRegOffset = 0x0;
2636                         mos7840_port->ControlRegOffset = 0x1;
2637                         mos7840_port->DcrRegOffset = 0x4;
2638                 } else if ((mos7840_port->port_num == 2)
2639                            && (serial->num_ports == 4)) {
2640                         mos7840_port->SpRegOffset = 0x8;
2641                         mos7840_port->ControlRegOffset = 0x9;
2642                         mos7840_port->DcrRegOffset = 0x16;
2643                 } else if ((mos7840_port->port_num == 2)
2644                            && (serial->num_ports == 2)) {
2645                         mos7840_port->SpRegOffset = 0xa;
2646                         mos7840_port->ControlRegOffset = 0xb;
2647                         mos7840_port->DcrRegOffset = 0x19;
2648                 } else if ((mos7840_port->port_num == 3)
2649                            && (serial->num_ports == 4)) {
2650                         mos7840_port->SpRegOffset = 0xa;
2651                         mos7840_port->ControlRegOffset = 0xb;
2652                         mos7840_port->DcrRegOffset = 0x19;
2653                 } else if ((mos7840_port->port_num == 4)
2654                            && (serial->num_ports == 4)) {
2655                         mos7840_port->SpRegOffset = 0xc;
2656                         mos7840_port->ControlRegOffset = 0xd;
2657                         mos7840_port->DcrRegOffset = 0x1c;
2658                 }
2659                 mos7840_dump_serial_port(mos7840_port);
2660
2661                 mos7840_set_port_private(serial->port[i], mos7840_port);
2662
2663                 //enable rx_disable bit in control register
2664
2665                 status =
2666                     mos7840_get_reg_sync(serial->port[i],
2667                                          mos7840_port->ControlRegOffset, &Data);
2668                 if (status < 0) {
2669                         dbg("Reading ControlReg failed status-0x%x\n", status);
2670                         break;
2671                 } else
2672                         dbg("ControlReg Reading success val is %x, status%d\n",
2673                             Data, status);
2674                 Data |= 0x08;   //setting driver done bit
2675                 Data |= 0x04;   //sp1_bit to have cts change reflect in modem status reg
2676
2677                 //Data |= 0x20; //rx_disable bit
2678                 status = 0;
2679                 status =
2680                     mos7840_set_reg_sync(serial->port[i],
2681                                          mos7840_port->ControlRegOffset, Data);
2682                 if (status < 0) {
2683                         dbg("Writing ControlReg failed(rx_disable) status-0x%x\n", status);
2684                         break;
2685                 } else
2686                         dbg("ControlReg Writing success(rx_disable) status%d\n",
2687                             status);
2688
2689                 //Write default values in DCR (i.e 0x01 in DCR0, 0x05 in DCR2 and 0x24 in DCR3
2690                 Data = 0x01;
2691                 status = 0;
2692                 status =
2693                     mos7840_set_reg_sync(serial->port[i],
2694                                          (__u16) (mos7840_port->DcrRegOffset +
2695                                                   0), Data);
2696                 if (status < 0) {
2697                         dbg("Writing DCR0 failed status-0x%x\n", status);
2698                         break;
2699                 } else
2700                         dbg("DCR0 Writing success status%d\n", status);
2701
2702                 Data = 0x05;
2703                 status = 0;
2704                 status =
2705                     mos7840_set_reg_sync(serial->port[i],
2706                                          (__u16) (mos7840_port->DcrRegOffset +
2707                                                   1), Data);
2708                 if (status < 0) {
2709                         dbg("Writing DCR1 failed status-0x%x\n", status);
2710                         break;
2711                 } else
2712                         dbg("DCR1 Writing success status%d\n", status);
2713
2714                 Data = 0x24;
2715                 status = 0;
2716                 status =
2717                     mos7840_set_reg_sync(serial->port[i],
2718                                          (__u16) (mos7840_port->DcrRegOffset +
2719                                                   2), Data);
2720                 if (status < 0) {
2721                         dbg("Writing DCR2 failed status-0x%x\n", status);
2722                         break;
2723                 } else
2724                         dbg("DCR2 Writing success status%d\n", status);
2725
2726                 // write values in clkstart0x0 and clkmulti 0x20
2727                 Data = 0x0;
2728                 status = 0;
2729                 status =
2730                     mos7840_set_reg_sync(serial->port[i],
2731                                          CLK_START_VALUE_REGISTER, Data);
2732                 if (status < 0) {
2733                         dbg("Writing CLK_START_VALUE_REGISTER failed status-0x%x\n", status);
2734                         break;
2735                 } else
2736                         dbg("CLK_START_VALUE_REGISTER Writing success status%d\n", status);
2737
2738                 Data = 0x20;
2739                 status =
2740                     mos7840_set_reg_sync(serial->port[i], CLK_MULTI_REGISTER,
2741                                          Data);
2742                 if (status < 0) {
2743                         dbg("Writing CLK_MULTI_REGISTER failed status-0x%x\n",
2744                             status);
2745                         goto error;
2746                 } else
2747                         dbg("CLK_MULTI_REGISTER Writing success status%d\n",
2748                             status);
2749
2750                 //write value 0x0 to scratchpad register
2751                 Data = 0x00;
2752                 status =
2753                     mos7840_set_uart_reg(serial->port[i], SCRATCH_PAD_REGISTER,
2754                                          Data);
2755                 if (status < 0) {
2756                         dbg("Writing SCRATCH_PAD_REGISTER failed status-0x%x\n",
2757                             status);
2758                         break;
2759                 } else
2760                         dbg("SCRATCH_PAD_REGISTER Writing success status%d\n",
2761                             status);
2762
2763                 //Zero Length flag register
2764                 if ((mos7840_port->port_num != 1)
2765                     && (serial->num_ports == 2)) {
2766
2767                         Data = 0xff;
2768                         status = 0;
2769                         status = mos7840_set_reg_sync(serial->port[i],
2770                                                       (__u16) (ZLP_REG1 +
2771                                                                ((__u16)
2772                                                                 mos7840_port->
2773                                                                 port_num)),
2774                                                       Data);
2775                         dbg("ZLIP offset%x\n",
2776                             (__u16) (ZLP_REG1 +
2777                                      ((__u16) mos7840_port->port_num)));
2778                         if (status < 0) {
2779                                 dbg("Writing ZLP_REG%d failed status-0x%x\n",
2780                                     i + 2, status);
2781                                 break;
2782                         } else
2783                                 dbg("ZLP_REG%d Writing success status%d\n",
2784                                     i + 2, status);
2785                 } else {
2786                         Data = 0xff;
2787                         status = 0;
2788                         status = mos7840_set_reg_sync(serial->port[i],
2789                                                       (__u16) (ZLP_REG1 +
2790                                                                ((__u16)
2791                                                                 mos7840_port->
2792                                                                 port_num) -
2793                                                                0x1), Data);
2794                         dbg("ZLIP offset%x\n",
2795                             (__u16) (ZLP_REG1 +
2796                                      ((__u16) mos7840_port->port_num) - 0x1));
2797                         if (status < 0) {
2798                                 dbg("Writing ZLP_REG%d failed status-0x%x\n",
2799                                     i + 1, status);
2800                                 break;
2801                         } else
2802                                 dbg("ZLP_REG%d Writing success status%d\n",
2803                                     i + 1, status);
2804
2805                 }
2806                 mos7840_port->control_urb = usb_alloc_urb(0, GFP_KERNEL);
2807                 mos7840_port->ctrl_buf = kmalloc(16, GFP_KERNEL);
2808                 mos7840_port->dr = kmalloc(sizeof(struct usb_ctrlrequest), GFP_KERNEL);
2809                 if (!mos7840_port->control_urb || !mos7840_port->ctrl_buf || !mos7840_port->dr) {
2810                         status = -ENOMEM;
2811                         goto error;
2812                 }
2813         }
2814
2815         //Zero Length flag enable
2816         Data = 0x0f;
2817         status = mos7840_set_reg_sync(serial->port[0], ZLP_REG5, Data);
2818         if (status < 0) {
2819                 dbg("Writing ZLP_REG5 failed status-0x%x\n", status);
2820                 return -1;
2821         } else
2822                 dbg("ZLP_REG5 Writing success status%d\n", status);
2823
2824         /* setting configuration feature to one */
2825         usb_control_msg(serial->dev, usb_sndctrlpipe(serial->dev, 0),
2826                         (__u8) 0x03, 0x00, 0x01, 0x00, NULL, 0x00, 5 * HZ);
2827         return 0;
2828 error:
2829         for (/* nothing */; i >= 0; i--) {
2830                 mos7840_port = mos7840_get_port_private(serial->port[i]);
2831
2832                 kfree(mos7840_port->dr);
2833                 kfree(mos7840_port->ctrl_buf);
2834                 usb_free_urb(mos7840_port->control_urb);
2835                 kfree(mos7840_port);
2836                 serial->port[i] = NULL;
2837         }
2838         return status;
2839 }
2840
2841 /****************************************************************************
2842  * mos7840_shutdown
2843  *      This function is called whenever the device is removed from the usb bus.
2844  ****************************************************************************/
2845
2846 static void mos7840_shutdown(struct usb_serial *serial)
2847 {
2848         int i;
2849         unsigned long flags;
2850         struct moschip_port *mos7840_port;
2851         dbg("%s \n", " shutdown :entering..........");
2852
2853         if (!serial) {
2854                 dbg("%s", "Invalid Handler \n");
2855                 return;
2856         }
2857
2858         /*      check for the ports to be closed,close the ports and disconnect         */
2859
2860         /* free private structure allocated for serial port  *
2861          * stop reads and writes on all ports                */
2862
2863         for (i = 0; i < serial->num_ports; ++i) {
2864                 mos7840_port = mos7840_get_port_private(serial->port[i]);
2865                 spin_lock_irqsave(&mos7840_port->pool_lock, flags);
2866                 mos7840_port->zombie = 1;
2867                 spin_unlock_irqrestore(&mos7840_port->pool_lock, flags);
2868                 usb_kill_urb(mos7840_port->control_urb);
2869                 kfree(mos7840_port->ctrl_buf);
2870                 kfree(mos7840_port->dr);
2871                 kfree(mos7840_port);
2872                 mos7840_set_port_private(serial->port[i], NULL);
2873         }
2874
2875         dbg("%s\n", "Thank u :: ");
2876
2877 }
2878
2879 static struct usb_driver io_driver = {
2880         .name = "mos7840",
2881         .probe = usb_serial_probe,
2882         .disconnect = usb_serial_disconnect,
2883         .id_table = moschip_id_table_combined,
2884         .no_dynamic_id = 1,
2885 };
2886
2887 static struct usb_serial_driver moschip7840_4port_device = {
2888         .driver = {
2889                    .owner = THIS_MODULE,
2890                    .name = "mos7840",
2891                    },
2892         .description = DRIVER_DESC,
2893         .usb_driver = &io_driver,
2894         .id_table = moschip_port_id_table,
2895         .num_interrupt_in = 1,  //NUM_DONT_CARE,//1,
2896 #ifdef check
2897         .num_bulk_in = 4,
2898         .num_bulk_out = 4,
2899         .num_ports = 4,
2900 #endif
2901         .open = mos7840_open,
2902         .close = mos7840_close,
2903         .write = mos7840_write,
2904         .write_room = mos7840_write_room,
2905         .chars_in_buffer = mos7840_chars_in_buffer,
2906         .throttle = mos7840_throttle,
2907         .unthrottle = mos7840_unthrottle,
2908         .calc_num_ports = mos7840_calc_num_ports,
2909 #ifdef MCSSerialProbe
2910         .probe = mos7840_serial_probe,
2911 #endif
2912         .ioctl = mos7840_ioctl,
2913         .set_termios = mos7840_set_termios,
2914         .break_ctl = mos7840_break,
2915         .tiocmget = mos7840_tiocmget,
2916         .tiocmset = mos7840_tiocmset,
2917         .attach = mos7840_startup,
2918         .shutdown = mos7840_shutdown,
2919         .read_bulk_callback = mos7840_bulk_in_callback,
2920         .read_int_callback = mos7840_interrupt_callback,
2921 };
2922
2923 /****************************************************************************
2924  * moschip7840_init
2925  *      This is called by the module subsystem, or on startup to initialize us
2926  ****************************************************************************/
2927 static int __init moschip7840_init(void)
2928 {
2929         int retval;
2930
2931         dbg("%s \n", " mos7840_init :entering..........");
2932
2933         /* Register with the usb serial */
2934         retval = usb_serial_register(&moschip7840_4port_device);
2935
2936         if (retval)
2937                 goto failed_port_device_register;
2938
2939         dbg("%s\n", "Entring...");
2940         info(DRIVER_DESC " " DRIVER_VERSION);
2941
2942         /* Register with the usb */
2943         retval = usb_register(&io_driver);
2944
2945         if (retval)
2946                 goto failed_usb_register;
2947
2948         if (retval == 0) {
2949                 dbg("%s\n", "Leaving...");
2950                 return 0;
2951         }
2952
2953       failed_usb_register:
2954         usb_serial_deregister(&moschip7840_4port_device);
2955
2956       failed_port_device_register:
2957
2958         return retval;
2959 }
2960
2961 /****************************************************************************
2962  * moschip7840_exit
2963  *      Called when the driver is about to be unloaded.
2964  ****************************************************************************/
2965 static void __exit moschip7840_exit(void)
2966 {
2967
2968         dbg("%s \n", " mos7840_exit :entering..........");
2969
2970         usb_deregister(&io_driver);
2971
2972         usb_serial_deregister(&moschip7840_4port_device);
2973
2974         dbg("%s\n", "Entring...");
2975 }
2976
2977 module_init(moschip7840_init);
2978 module_exit(moschip7840_exit);
2979
2980 /* Module information */
2981 MODULE_DESCRIPTION(DRIVER_DESC);
2982 MODULE_LICENSE("GPL");
2983
2984 module_param(debug, bool, S_IRUGO | S_IWUSR);
2985 MODULE_PARM_DESC(debug, "Debug enabled or not");