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/smp_lock.h>
  30 #include <linux/tty.h>
  31 #include <linux/tty_driver.h>
  32 #include <linux/tty_flip.h>
  33 #include <linux/module.h>
  34 #include <linux/serial.h>
  35 #include <linux/usb.h>
  36 #include <linux/usb/serial.h>
  37 #include <linux/uaccess.h>
  38
  39 /*
  40  * Version Information
  41  */
  42 #define DRIVER_VERSION "1.3.2"
  43 #define DRIVER_DESC "Moschip 7840/7820 USB Serial Driver"
  44
  45 /*
  46  * 16C50 UART register defines
  47  */
  48
  49 #define LCR_BITS_5             0x00     /* 5 bits/char */
  50 #define LCR_BITS_6             0x01     /* 6 bits/char */
  51 #define LCR_BITS_7             0x02     /* 7 bits/char */
  52 #define LCR_BITS_8             0x03     /* 8 bits/char */
  53 #define LCR_BITS_MASK          0x03     /* Mask for bits/char field */
  54
  55 #define LCR_STOP_1             0x00     /* 1 stop bit */
  56 #define LCR_STOP_1_5           0x04     /* 1.5 stop bits (if 5   bits/char) */
  57 #define LCR_STOP_2             0x04     /* 2 stop bits   (if 6-8 bits/char) */
  58 #define LCR_STOP_MASK          0x04     /* Mask for stop bits field */
  59
  60 #define LCR_PAR_NONE           0x00     /* No parity */
  61 #define LCR_PAR_ODD            0x08     /* Odd parity */
  62 #define LCR_PAR_EVEN           0x18     /* Even parity */
  63 #define LCR_PAR_MARK           0x28     /* Force parity bit to 1 */
  64 #define LCR_PAR_SPACE          0x38     /* Force parity bit to 0 */
  65 #define LCR_PAR_MASK           0x38     /* Mask for parity field */
  66
  67 #define LCR_SET_BREAK          0x40     /* Set Break condition */
  68 #define LCR_DL_ENABLE          0x80     /* Enable access to divisor latch */
  69
  70 #define MCR_DTR                0x01     /* Assert DTR */
  71 #define MCR_RTS                0x02     /* Assert RTS */
  72 #define MCR_OUT1               0x04     /* Loopback only: Sets state of RI */
  73 #define MCR_MASTER_IE          0x08     /* Enable interrupt outputs */
  74 #define MCR_LOOPBACK           0x10     /* Set internal (digital) loopback mode */
  75 #define MCR_XON_ANY            0x20     /* Enable any char to exit XOFF mode */
  76
  77 #define MOS7840_MSR_CTS        0x10     /* Current state of CTS */
  78 #define MOS7840_MSR_DSR        0x20     /* Current state of DSR */
  79 #define MOS7840_MSR_RI         0x40     /* Current state of RI */
  80 #define MOS7840_MSR_CD         0x80     /* Current state of CD */
  81
  82 /*
  83  * Defines used for sending commands to port
  84  */
  85
  86 #define WAIT_FOR_EVER   (HZ * 0)        /* timeout urb is wait for ever */
  87 #define MOS_WDR_TIMEOUT (HZ * 5)        /* default urb timeout */
  88
  89 #define MOS_PORT1       0x0200
  90 #define MOS_PORT2       0x0300
  91 #define MOS_VENREG      0x0000
  92 #define MOS_MAX_PORT    0x02
  93 #define MOS_WRITE       0x0E
  94 #define MOS_READ        0x0D
  95
  96 /* Requests */
  97 #define MCS_RD_RTYPE    0xC0
  98 #define MCS_WR_RTYPE    0x40
  99 #define MCS_RDREQ       0x0D
 100 #define MCS_WRREQ       0x0E
 101 #define MCS_CTRL_TIMEOUT        500
 102 #define VENDOR_READ_LENGTH      (0x01)
 103
 104 #define MAX_NAME_LEN    64
 105
 106 #define ZLP_REG1  0x3A          /* Zero_Flag_Reg1    58 */
 107 #define ZLP_REG5  0x3E          /* Zero_Flag_Reg5    62 */
 108
 109 /* For higher baud Rates use TIOCEXBAUD */
 110 #define TIOCEXBAUD     0x5462
 111
 112 /* vendor id and device id defines */
 113
 114 /* The native mos7840/7820 component */
 115 #define USB_VENDOR_ID_MOSCHIP           0x9710
 116 #define MOSCHIP_DEVICE_ID_7840          0x7840
 117 #define MOSCHIP_DEVICE_ID_7820          0x7820
 118 /* The native component can have its vendor/device id's overridden
 119  * in vendor-specific implementations.  Such devices can be handled
 120  * by making a change here, in moschip_port_id_table, and in
 121  * moschip_id_table_combined
 122  */
 123 #define USB_VENDOR_ID_BANDB             0x0856
 124 #define BANDB_DEVICE_ID_USO9ML2_2       0xAC22
 125 #define BANDB_DEVICE_ID_USO9ML2_4       0xAC24
 126 #define BANDB_DEVICE_ID_US9ML2_2        0xAC29
 127 #define BANDB_DEVICE_ID_US9ML2_4        0xAC30
 128 #define BANDB_DEVICE_ID_USPTL4_2        0xAC31
 129 #define BANDB_DEVICE_ID_USPTL4_4        0xAC32
 130 #define BANDB_DEVICE_ID_USOPTL4_2       0xAC42
 131 #define BANDB_DEVICE_ID_USOPTL4_4       0xAC44
 132 #define BANDB_DEVICE_ID_USOPTL2_4       0xAC24
 133
 134 /* This driver also supports
 135  * ATEN UC2324 device using Moschip MCS7840
 136  * ATEN UC2322 device using Moschip MCS7820
 137  */
 138 #define USB_VENDOR_ID_ATENINTL          0x0557
 139 #define ATENINTL_DEVICE_ID_UC2324       0x2011
 140 #define ATENINTL_DEVICE_ID_UC2322       0x7820
 141
 142 /* Interrupt Routine Defines    */
 143
 144 #define SERIAL_IIR_RLS      0x06
 145 #define SERIAL_IIR_MS       0x00
 146
 147 /*
 148  *  Emulation of the bit mask on the LINE STATUS REGISTER.
 149  */
 150 #define SERIAL_LSR_DR       0x0001
 151 #define SERIAL_LSR_OE       0x0002
 152 #define SERIAL_LSR_PE       0x0004
 153 #define SERIAL_LSR_FE       0x0008
 154 #define SERIAL_LSR_BI       0x0010
 155
 156 #define MOS_MSR_DELTA_CTS   0x10
 157 #define MOS_MSR_DELTA_DSR   0x20
 158 #define MOS_MSR_DELTA_RI    0x40
 159 #define MOS_MSR_DELTA_CD    0x80
 160
 161 /* Serial Port register Address */
 162 #define INTERRUPT_ENABLE_REGISTER  ((__u16)(0x01))
 163 #define FIFO_CONTROL_REGISTER      ((__u16)(0x02))
 164 #define LINE_CONTROL_REGISTER      ((__u16)(0x03))
 165 #define MODEM_CONTROL_REGISTER     ((__u16)(0x04))
 166 #define LINE_STATUS_REGISTER       ((__u16)(0x05))
 167 #define MODEM_STATUS_REGISTER      ((__u16)(0x06))
 168 #define SCRATCH_PAD_REGISTER       ((__u16)(0x07))
 169 #define DIVISOR_LATCH_LSB          ((__u16)(0x00))
 170 #define DIVISOR_LATCH_MSB          ((__u16)(0x01))
 171
 172 #define CLK_MULTI_REGISTER         ((__u16)(0x02))
 173 #define CLK_START_VALUE_REGISTER   ((__u16)(0x03))
 174
 175 #define SERIAL_LCR_DLAB            ((__u16)(0x0080))
 176
 177 /*
 178  * URB POOL related defines
 179  */
 180 #define NUM_URBS                        16      /* URB Count */
 181 #define URB_TRANSFER_BUFFER_SIZE        32      /* URB Size  */
 182
 183
 184 static const struct usb_device_id moschip_port_id_table[] = {
 185         {USB_DEVICE(USB_VENDOR_ID_MOSCHIP, MOSCHIP_DEVICE_ID_7840)},
 186         {USB_DEVICE(USB_VENDOR_ID_MOSCHIP, MOSCHIP_DEVICE_ID_7820)},
 187         {USB_DEVICE(USB_VENDOR_ID_BANDB, BANDB_DEVICE_ID_USO9ML2_2)},
 188         {USB_DEVICE(USB_VENDOR_ID_BANDB, BANDB_DEVICE_ID_USO9ML2_4)},
 189         {USB_DEVICE(USB_VENDOR_ID_BANDB, BANDB_DEVICE_ID_US9ML2_2)},
 190         {USB_DEVICE(USB_VENDOR_ID_BANDB, BANDB_DEVICE_ID_US9ML2_4)},
 191         {USB_DEVICE(USB_VENDOR_ID_BANDB, BANDB_DEVICE_ID_USPTL4_2)},
 192         {USB_DEVICE(USB_VENDOR_ID_BANDB, BANDB_DEVICE_ID_USPTL4_4)},
 193         {USB_DEVICE(USB_VENDOR_ID_BANDB, BANDB_DEVICE_ID_USOPTL4_2)},
 194         {USB_DEVICE(USB_VENDOR_ID_BANDB, BANDB_DEVICE_ID_USOPTL4_4)},
 195         {USB_DEVICE(USB_VENDOR_ID_BANDB, BANDB_DEVICE_ID_USOPTL2_4)},
 196         {USB_DEVICE(USB_VENDOR_ID_ATENINTL, ATENINTL_DEVICE_ID_UC2324)},
 197         {USB_DEVICE(USB_VENDOR_ID_ATENINTL, ATENINTL_DEVICE_ID_UC2322)},
 198         {}                      /* terminating entry */
 199 };
 200
 201 static const struct usb_device_id moschip_id_table_combined[] __devinitconst = {
 202         {USB_DEVICE(USB_VENDOR_ID_MOSCHIP, MOSCHIP_DEVICE_ID_7840)},
 203         {USB_DEVICE(USB_VENDOR_ID_MOSCHIP, MOSCHIP_DEVICE_ID_7820)},
 204         {USB_DEVICE(USB_VENDOR_ID_BANDB, BANDB_DEVICE_ID_USO9ML2_2)},
 205         {USB_DEVICE(USB_VENDOR_ID_BANDB, BANDB_DEVICE_ID_USO9ML2_4)},
 206         {USB_DEVICE(USB_VENDOR_ID_BANDB, BANDB_DEVICE_ID_US9ML2_2)},
 207         {USB_DEVICE(USB_VENDOR_ID_BANDB, BANDB_DEVICE_ID_US9ML2_4)},
 208         {USB_DEVICE(USB_VENDOR_ID_BANDB, BANDB_DEVICE_ID_USPTL4_2)},
 209         {USB_DEVICE(USB_VENDOR_ID_BANDB, BANDB_DEVICE_ID_USPTL4_4)},
 210         {USB_DEVICE(USB_VENDOR_ID_BANDB, BANDB_DEVICE_ID_USOPTL4_2)},
 211         {USB_DEVICE(USB_VENDOR_ID_BANDB, BANDB_DEVICE_ID_USOPTL4_4)},
 212         {USB_DEVICE(USB_VENDOR_ID_BANDB, BANDB_DEVICE_ID_USOPTL2_4)},
 213         {USB_DEVICE(USB_VENDOR_ID_ATENINTL, ATENINTL_DEVICE_ID_UC2324)},
 214         {USB_DEVICE(USB_VENDOR_ID_ATENINTL, ATENINTL_DEVICE_ID_UC2322)},
 215         {}                      /* terminating entry */
 216 };
 217
 218 MODULE_DEVICE_TABLE(usb, moschip_id_table_combined);
 219
 220 /* This structure holds all of the local port information */
 221
 222 struct moschip_port {
 223         int port_num;           /*Actual port number in the device(1,2,etc) */
 224         struct urb *write_urb;  /* write URB for this port */
 225         struct urb *read_urb;   /* read URB for this port */
 226         struct urb *int_urb;
 227         __u8 shadowLCR;         /* last LCR value received */
 228         __u8 shadowMCR;         /* last MCR value received */
 229         char open;
 230         char open_ports;
 231         char zombie;
 232         wait_queue_head_t wait_chase;   /* for handling sleeping while waiting for chase to finish */
 233         wait_queue_head_t delta_msr_wait;       /* for handling sleeping while waiting for msr change to happen */
 234         int delta_msr_cond;
 235         struct async_icount icount;
 236         struct usb_serial_port *port;   /* loop back to the owner of this object */
 237
 238         /* Offsets */
 239         __u8 SpRegOffset;
 240         __u8 ControlRegOffset;
 241         __u8 DcrRegOffset;
 242         /* for processing control URBS in interrupt context */
 243         struct urb *control_urb;
 244         struct usb_ctrlrequest *dr;
 245         char *ctrl_buf;
 246         int MsrLsr;
 247
 248         spinlock_t pool_lock;
 249         struct urb *write_urb_pool[NUM_URBS];
 250         char busy[NUM_URBS];
 251         bool read_urb_busy;
 252 };
 253
 254
 255 static int debug;
 256
 257 /*
 258  * mos7840_set_reg_sync
 259  *      To set the Control register by calling usb_fill_control_urb function
 260  *      by passing usb_sndctrlpipe function as parameter.
 261  */
 262
 263 static int mos7840_set_reg_sync(struct usb_serial_port *port, __u16 reg,
 264                                 __u16 val)
 265 {
 266         struct usb_device *dev = port->serial->dev;
 267         val = val & 0x00ff;
 268         dbg("mos7840_set_reg_sync offset is %x, value %x", reg, val);
 269
 270         return usb_control_msg(dev, usb_sndctrlpipe(dev, 0), MCS_WRREQ,
 271                                MCS_WR_RTYPE, val, reg, NULL, 0,
 272                                MOS_WDR_TIMEOUT);
 273 }
 274
 275 /*
 276  * mos7840_get_reg_sync
 277  *      To set the Uart register by calling usb_fill_control_urb function by
 278  *      passing usb_rcvctrlpipe function as parameter.
 279  */
 280
 281 static int mos7840_get_reg_sync(struct usb_serial_port *port, __u16 reg,
 282                                 __u16 *val)
 283 {
 284         struct usb_device *dev = port->serial->dev;
 285         int ret = 0;
 286         u8 *buf;
 287
 288         buf = kmalloc(VENDOR_READ_LENGTH, GFP_KERNEL);
 289         if (!buf)
 290                 return -ENOMEM;
 291
 292         ret = usb_control_msg(dev, usb_rcvctrlpipe(dev, 0), MCS_RDREQ,
 293                               MCS_RD_RTYPE, 0, reg, buf, VENDOR_READ_LENGTH,
 294                               MOS_WDR_TIMEOUT);
 295         *val = buf[0];
 296         dbg("mos7840_get_reg_sync offset is %x, return val %x", reg, *val);
 297
 298         kfree(buf);
 299         return ret;
 300 }
 301
 302 /*
 303  * mos7840_set_uart_reg
 304  *      To set the Uart register by calling usb_fill_control_urb function by
 305  *      passing usb_sndctrlpipe function as parameter.
 306  */
 307
 308 static int mos7840_set_uart_reg(struct usb_serial_port *port, __u16 reg,
 309                                 __u16 val)
 310 {
 311
 312         struct usb_device *dev = port->serial->dev;
 313         val = val & 0x00ff;
 314         /* For the UART control registers, the application number need
 315            to be Or'ed */
 316         if (port->serial->num_ports == 4) {
 317                 val |= (((__u16) port->number -
 318                                 (__u16) (port->serial->minor)) + 1) << 8;
 319                 dbg("mos7840_set_uart_reg application number is %x", val);
 320         } else {
 321                 if (((__u16) port->number - (__u16) (port->serial->minor)) == 0) {
 322                         val |= (((__u16) port->number -
 323                               (__u16) (port->serial->minor)) + 1) << 8;
 324                         dbg("mos7840_set_uart_reg application number is %x",
 325                             val);
 326                 } else {
 327                         val |=
 328                             (((__u16) port->number -
 329                               (__u16) (port->serial->minor)) + 2) << 8;
 330                         dbg("mos7840_set_uart_reg application number is %x",
 331                             val);
 332                 }
 333         }
 334         return usb_control_msg(dev, usb_sndctrlpipe(dev, 0), MCS_WRREQ,
 335                                MCS_WR_RTYPE, val, reg, NULL, 0,
 336                                MOS_WDR_TIMEOUT);
 337
 338 }
 339
 340 /*
 341  * mos7840_get_uart_reg
 342  *      To set the Control register by calling usb_fill_control_urb function
 343  *      by passing usb_rcvctrlpipe function as parameter.
 344  */
 345 static int mos7840_get_uart_reg(struct usb_serial_port *port, __u16 reg,
 346                                 __u16 *val)
 347 {
 348         struct usb_device *dev = port->serial->dev;
 349         int ret = 0;
 350         __u16 Wval;
 351         u8 *buf;
 352
 353         buf = kmalloc(VENDOR_READ_LENGTH, GFP_KERNEL);
 354         if (!buf)
 355                 return -ENOMEM;
 356
 357         /* dbg("application number is %4x",
 358             (((__u16)port->number - (__u16)(port->serial->minor))+1)<<8); */
 359         /* Wval  is same as application number */
 360         if (port->serial->num_ports == 4) {
 361                 Wval =
 362                     (((__u16) port->number - (__u16) (port->serial->minor)) +
 363                      1) << 8;
 364                 dbg("mos7840_get_uart_reg application number is %x", Wval);
 365         } else {
 366                 if (((__u16) port->number - (__u16) (port->serial->minor)) == 0) {
 367                         Wval = (((__u16) port->number -
 368                               (__u16) (port->serial->minor)) + 1) << 8;
 369                         dbg("mos7840_get_uart_reg application number is %x",
 370                             Wval);
 371                 } else {
 372                         Wval = (((__u16) port->number -
 373                               (__u16) (port->serial->minor)) + 2) << 8;
 374                         dbg("mos7840_get_uart_reg application number is %x",
 375                             Wval);
 376                 }
 377         }
 378         ret = usb_control_msg(dev, usb_rcvctrlpipe(dev, 0), MCS_RDREQ,
 379                               MCS_RD_RTYPE, Wval, reg, buf, VENDOR_READ_LENGTH,
 380                               MOS_WDR_TIMEOUT);
 381         *val = buf[0];
 382
 383         kfree(buf);
 384         return ret;
 385 }
 386
 387 static void mos7840_dump_serial_port(struct moschip_port *mos7840_port)
 388 {
 389
 390         dbg("***************************************");
 391         dbg("SpRegOffset is %2x", mos7840_port->SpRegOffset);
 392         dbg("ControlRegOffset is %2x", mos7840_port->ControlRegOffset);
 393         dbg("DCRRegOffset is %2x", mos7840_port->DcrRegOffset);
 394         dbg("***************************************");
 395
 396 }
 397
 398 /************************************************************************/
 399 /************************************************************************/
 400 /*             I N T E R F A C E   F U N C T I O N S                    */
 401 /*             I N T E R F A C E   F U N C T I O N S                    */
 402 /************************************************************************/
 403 /************************************************************************/
 404
 405 static inline void mos7840_set_port_private(struct usb_serial_port *port,
 406                                             struct moschip_port *data)
 407 {
 408         usb_set_serial_port_data(port, (void *)data);
 409 }
 410
 411 static inline struct moschip_port *mos7840_get_port_private(struct
 412                                                             usb_serial_port
 413                                                             *port)
 414 {
 415         return (struct moschip_port *)usb_get_serial_port_data(port);
 416 }
 417
 418 static void mos7840_handle_new_msr(struct moschip_port *port, __u8 new_msr)
 419 {
 420         struct moschip_port *mos7840_port;
 421         struct async_icount *icount;
 422         mos7840_port = port;
 423         icount = &mos7840_port->icount;
 424         if (new_msr &
 425             (MOS_MSR_DELTA_CTS | MOS_MSR_DELTA_DSR | MOS_MSR_DELTA_RI |
 426              MOS_MSR_DELTA_CD)) {
 427                 icount = &mos7840_port->icount;
 428
 429                 /* update input line counters */
 430                 if (new_msr & MOS_MSR_DELTA_CTS) {
 431                         icount->cts++;
 432                         smp_wmb();
 433                 }
 434                 if (new_msr & MOS_MSR_DELTA_DSR) {
 435                         icount->dsr++;
 436                         smp_wmb();
 437                 }
 438                 if (new_msr & MOS_MSR_DELTA_CD) {
 439                         icount->dcd++;
 440                         smp_wmb();
 441                 }
 442                 if (new_msr & MOS_MSR_DELTA_RI) {
 443                         icount->rng++;
 444                         smp_wmb();
 445                 }
 446         }
 447 }
 448
 449 static void mos7840_handle_new_lsr(struct moschip_port *port, __u8 new_lsr)
 450 {
 451         struct async_icount *icount;
 452
 453         dbg("%s - %02x", __func__, new_lsr);
 454
 455         if (new_lsr & SERIAL_LSR_BI) {
 456                 /*
 457                  * Parity and Framing errors only count if they
 458                  * occur exclusive of a break being
 459                  * received.
 460                  */
 461                 new_lsr &= (__u8) (SERIAL_LSR_OE | SERIAL_LSR_BI);
 462         }
 463
 464         /* update input line counters */
 465         icount = &port->icount;
 466         if (new_lsr & SERIAL_LSR_BI) {
 467                 icount->brk++;
 468                 smp_wmb();
 469         }
 470         if (new_lsr & SERIAL_LSR_OE) {
 471                 icount->overrun++;
 472                 smp_wmb();
 473         }
 474         if (new_lsr & SERIAL_LSR_PE) {
 475                 icount->parity++;
 476                 smp_wmb();
 477         }
 478         if (new_lsr & SERIAL_LSR_FE) {
 479                 icount->frame++;
 480                 smp_wmb();
 481         }
 482 }
 483
 484 /************************************************************************/
 485 /************************************************************************/
 486 /*            U S B  C A L L B A C K   F U N C T I O N S                */
 487 /*            U S B  C A L L B A C K   F U N C T I O N S                */
 488 /************************************************************************/
 489 /************************************************************************/
 490
 491 static void mos7840_control_callback(struct urb *urb)
 492 {
 493         unsigned char *data;
 494         struct moschip_port *mos7840_port;
 495         __u8 regval = 0x0;
 496         int result = 0;
 497         int status = urb->status;
 498
 499         mos7840_port = urb->context;
 500
 501         switch (status) {
 502         case 0:
 503                 /* success */
 504                 break;
 505         case -ECONNRESET:
 506         case -ENOENT:
 507         case -ESHUTDOWN:
 508                 /* this urb is terminated, clean up */
 509                 dbg("%s - urb shutting down with status: %d", __func__,
 510                     status);
 511                 return;
 512         default:
 513                 dbg("%s - nonzero urb status received: %d", __func__,
 514                     status);
 515                 goto exit;
 516         }
 517
 518         dbg("%s urb buffer size is %d", __func__, urb->actual_length);
 519         dbg("%s mos7840_port->MsrLsr is %d port %d", __func__,
 520             mos7840_port->MsrLsr, mos7840_port->port_num);
 521         data = urb->transfer_buffer;
 522         regval = (__u8) data[0];
 523         dbg("%s data is %x", __func__, regval);
 524         if (mos7840_port->MsrLsr == 0)
 525                 mos7840_handle_new_msr(mos7840_port, regval);
 526         else if (mos7840_port->MsrLsr == 1)
 527                 mos7840_handle_new_lsr(mos7840_port, regval);
 528
 529 exit:
 530         spin_lock(&mos7840_port->pool_lock);
 531         if (!mos7840_port->zombie)
 532                 result = usb_submit_urb(mos7840_port->int_urb, GFP_ATOMIC);
 533         spin_unlock(&mos7840_port->pool_lock);
 534         if (result) {
 535                 dev_err(&urb->dev->dev,
 536                         "%s - Error %d submitting interrupt urb\n",
 537                         __func__, result);
 538         }
 539 }
 540
 541 static int mos7840_get_reg(struct moschip_port *mcs, __u16 Wval, __u16 reg,
 542                            __u16 *val)
 543 {
 544         struct usb_device *dev = mcs->port->serial->dev;
 545         struct usb_ctrlrequest *dr = mcs->dr;
 546         unsigned char *buffer = mcs->ctrl_buf;
 547         int ret;
 548
 549         dr->bRequestType = MCS_RD_RTYPE;
 550         dr->bRequest = MCS_RDREQ;
 551         dr->wValue = cpu_to_le16(Wval); /* 0 */
 552         dr->wIndex = cpu_to_le16(reg);
 553         dr->wLength = cpu_to_le16(2);
 554
 555         usb_fill_control_urb(mcs->control_urb, dev, usb_rcvctrlpipe(dev, 0),
 556                              (unsigned char *)dr, buffer, 2,
 557                              mos7840_control_callback, mcs);
 558         mcs->control_urb->transfer_buffer_length = 2;
 559         ret = usb_submit_urb(mcs->control_urb, GFP_ATOMIC);
 560         return ret;
 561 }
 562
 563 /*****************************************************************************
 564  * mos7840_interrupt_callback
 565  *      this is the callback function for when we have received data on the
 566  *      interrupt endpoint.
 567  *****************************************************************************/
 568
 569 static void mos7840_interrupt_callback(struct urb *urb)
 570 {
 571         int result;
 572         int length;
 573         struct moschip_port *mos7840_port;
 574         struct usb_serial *serial;
 575         __u16 Data;
 576         unsigned char *data;
 577         __u8 sp[5], st;
 578         int i, rv = 0;
 579         __u16 wval, wreg = 0;
 580         int status = urb->status;
 581
 582         dbg("%s", " : Entering");
 583
 584         switch (status) {
 585         case 0:
 586                 /* success */
 587                 break;
 588         case -ECONNRESET:
 589         case -ENOENT:
 590         case -ESHUTDOWN:
 591                 /* this urb is terminated, clean up */
 592                 dbg("%s - urb shutting down with status: %d", __func__,
 593                     status);
 594                 return;
 595         default:
 596                 dbg("%s - nonzero urb status received: %d", __func__,
 597                     status);
 598                 goto exit;
 599         }
 600
 601         length = urb->actual_length;
 602         data = urb->transfer_buffer;
 603
 604         serial = urb->context;
 605
 606         /* Moschip get 5 bytes
 607          * Byte 1 IIR Port 1 (port.number is 0)
 608          * Byte 2 IIR Port 2 (port.number is 1)
 609          * Byte 3 IIR Port 3 (port.number is 2)
 610          * Byte 4 IIR Port 4 (port.number is 3)
 611          * Byte 5 FIFO status for both */
 612
 613         if (length && length > 5) {
 614                 dbg("%s", "Wrong data !!!");
 615                 return;
 616         }
 617
 618         sp[0] = (__u8) data[0];
 619         sp[1] = (__u8) data[1];
 620         sp[2] = (__u8) data[2];
 621         sp[3] = (__u8) data[3];
 622         st = (__u8) data[4];
 623
 624         for (i = 0; i < serial->num_ports; i++) {
 625                 mos7840_port = mos7840_get_port_private(serial->port[i]);
 626                 wval =
 627                     (((__u16) serial->port[i]->number -
 628                       (__u16) (serial->minor)) + 1) << 8;
 629                 if (mos7840_port->open) {
 630                         if (sp[i] & 0x01) {
 631                                 dbg("SP%d No Interrupt !!!", i);
 632                         } else {
 633                                 switch (sp[i] & 0x0f) {
 634                                 case SERIAL_IIR_RLS:
 635                                         dbg("Serial Port %d: Receiver status error or ", i);
 636                                         dbg("address bit detected in 9-bit mode");
 637                                         mos7840_port->MsrLsr = 1;
 638                                         wreg = LINE_STATUS_REGISTER;
 639                                         break;
 640                                 case SERIAL_IIR_MS:
 641                                         dbg("Serial Port %d: Modem status change", i);
 642                                         mos7840_port->MsrLsr = 0;
 643                                         wreg = MODEM_STATUS_REGISTER;
 644                                         break;
 645                                 }
 646                                 spin_lock(&mos7840_port->pool_lock);
 647                                 if (!mos7840_port->zombie) {
 648                                         rv = mos7840_get_reg(mos7840_port, wval, wreg, &Data);
 649                                 } else {
 650                                         spin_unlock(&mos7840_port->pool_lock);
 651                                         return;
 652                                 }
 653                                 spin_unlock(&mos7840_port->pool_lock);
 654                         }
 655                 }
 656         }
 657         if (!(rv < 0))
 658                 /* the completion handler for the control urb will resubmit */
 659                 return;
 660 exit:
 661         result = usb_submit_urb(urb, GFP_ATOMIC);
 662         if (result) {
 663                 dev_err(&urb->dev->dev,
 664                         "%s - Error %d submitting interrupt urb\n",
 665                         __func__, result);
 666         }
 667 }
 668
 669 static int mos7840_port_paranoia_check(struct usb_serial_port *port,
 670                                        const char *function)
 671 {
 672         if (!port) {
 673                 dbg("%s - port == NULL", function);
 674                 return -1;
 675         }
 676         if (!port->serial) {
 677                 dbg("%s - port->serial == NULL", function);
 678                 return -1;
 679         }
 680
 681         return 0;
 682 }
 683
 684 /* Inline functions to check the sanity of a pointer that is passed to us */
 685 static int mos7840_serial_paranoia_check(struct usb_serial *serial,
 686                                          const char *function)
 687 {
 688         if (!serial) {
 689                 dbg("%s - serial == NULL", function);
 690                 return -1;
 691         }
 692         if (!serial->type) {
 693                 dbg("%s - serial->type == NULL!", function);
 694                 return -1;
 695         }
 696
 697         return 0;
 698 }
 699
 700 static struct usb_serial *mos7840_get_usb_serial(struct usb_serial_port *port,
 701                                                  const char *function)
 702 {
 703         /* if no port was specified, or it fails a paranoia check */
 704         if (!port ||
 705             mos7840_port_paranoia_check(port, function) ||
 706             mos7840_serial_paranoia_check(port->serial, function)) {
 707                 /* then say that we don't have a valid usb_serial thing,
 708                  * which will end up genrating -ENODEV return values */
 709                 return NULL;
 710         }
 711
 712         return port->serial;
 713 }
 714
 715 /*****************************************************************************
 716  * mos7840_bulk_in_callback
 717  *      this is the callback function for when we have received data on the
 718  *      bulk in endpoint.
 719  *****************************************************************************/
 720
 721 static void mos7840_bulk_in_callback(struct urb *urb)
 722 {
 723         int retval;
 724         unsigned char *data;
 725         struct usb_serial *serial;
 726         struct usb_serial_port *port;
 727         struct moschip_port *mos7840_port;
 728         struct tty_struct *tty;
 729         int status = urb->status;
 730
 731         mos7840_port = urb->context;
 732         if (!mos7840_port) {
 733                 dbg("%s", "NULL mos7840_port pointer");
 734                 mos7840_port->read_urb_busy = false;
 735                 return;
 736         }
 737
 738         if (status) {
 739                 dbg("nonzero read bulk status received: %d", status);
 740                 mos7840_port->read_urb_busy = false;
 741                 return;
 742         }
 743
 744         port = (struct usb_serial_port *)mos7840_port->port;
 745         if (mos7840_port_paranoia_check(port, __func__)) {
 746                 dbg("%s", "Port Paranoia failed");
 747                 mos7840_port->read_urb_busy = false;
 748                 return;
 749         }
 750
 751         serial = mos7840_get_usb_serial(port, __func__);
 752         if (!serial) {
 753                 dbg("%s", "Bad serial pointer");
 754                 mos7840_port->read_urb_busy = false;
 755                 return;
 756         }
 757
 758         dbg("%s", "Entering... ");
 759
 760         data = urb->transfer_buffer;
 761
 762         dbg("%s", "Entering ...........");
 763
 764         if (urb->actual_length) {
 765                 tty = tty_port_tty_get(&mos7840_port->port->port);
 766                 if (tty) {
 767                         tty_insert_flip_string(tty, data, urb->actual_length);
 768                         dbg(" %s ", data);
 769                         tty_flip_buffer_push(tty);
 770                         tty_kref_put(tty);
 771                 }
 772                 mos7840_port->icount.rx += urb->actual_length;
 773                 smp_wmb();
 774                 dbg("mos7840_port->icount.rx is %d:",
 775                     mos7840_port->icount.rx);
 776         }
 777
 778         if (!mos7840_port->read_urb) {
 779                 dbg("%s", "URB KILLED !!!");
 780                 mos7840_port->read_urb_busy = false;
 781                 return;
 782         }
 783
 784
 785         mos7840_port->read_urb->dev = serial->dev;
 786
 787         mos7840_port->read_urb_busy = true;
 788         retval = usb_submit_urb(mos7840_port->read_urb, GFP_ATOMIC);
 789
 790         if (retval) {
 791                 dbg("usb_submit_urb(read bulk) failed, retval = %d", retval);
 792                 mos7840_port->read_urb_busy = false;
 793         }
 794 }
 795
 796 /*****************************************************************************
 797  * mos7840_bulk_out_data_callback
 798  *      this is the callback function for when we have finished sending
 799  *      serial data on the bulk out endpoint.
 800  *****************************************************************************/
 801
 802 static void mos7840_bulk_out_data_callback(struct urb *urb)
 803 {
 804         struct moschip_port *mos7840_port;
 805         struct tty_struct *tty;
 806         int status = urb->status;
 807         int i;
 808
 809         mos7840_port = urb->context;
 810         spin_lock(&mos7840_port->pool_lock);
 811         for (i = 0; i < NUM_URBS; i++) {
 812                 if (urb == mos7840_port->write_urb_pool[i]) {
 813                         mos7840_port->busy[i] = 0;
 814                         break;
 815                 }
 816         }
 817         spin_unlock(&mos7840_port->pool_lock);
 818
 819         if (status) {
 820                 dbg("nonzero write bulk status received:%d", status);
 821                 return;
 822         }
 823
 824         if (mos7840_port_paranoia_check(mos7840_port->port, __func__)) {
 825                 dbg("%s", "Port Paranoia failed");
 826                 return;
 827         }
 828
 829         dbg("%s", "Entering .........");
 830
 831         tty = tty_port_tty_get(&mos7840_port->port->port);
 832         if (tty && mos7840_port->open)
 833                 tty_wakeup(tty);
 834         tty_kref_put(tty);
 835
 836 }
 837
 838 /************************************************************************/
 839 /*       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       */
 840 /************************************************************************/
 841 #ifdef MCSSerialProbe
 842 static int mos7840_serial_probe(struct usb_serial *serial,
 843                                 const struct usb_device_id *id)
 844 {
 845
 846         /*need to implement the mode_reg reading and updating\
 847            structures usb_serial_ device_type\
 848            (i.e num_ports, num_bulkin,bulkout etc) */
 849         /* Also we can update the changes  attach */
 850         return 1;
 851 }
 852 #endif
 853
 854 /*****************************************************************************
 855  * mos7840_open
 856  *      this function is called by the tty driver when a port is opened
 857  *      If successful, we return 0
 858  *      Otherwise we return a negative error number.
 859  *****************************************************************************/
 860
 861 static int mos7840_open(struct tty_struct *tty, struct usb_serial_port *port)
 862 {
 863         int response;
 864         int j;
 865         struct usb_serial *serial;
 866         struct urb *urb;
 867         __u16 Data;
 868         int status;
 869         struct moschip_port *mos7840_port;
 870         struct moschip_port *port0;
 871
 872         dbg ("%s enter", __func__);
 873
 874         if (mos7840_port_paranoia_check(port, __func__)) {
 875                 dbg("%s", "Port Paranoia failed");
 876                 return -ENODEV;
 877         }
 878
 879         serial = port->serial;
 880
 881         if (mos7840_serial_paranoia_check(serial, __func__)) {
 882                 dbg("%s", "Serial Paranoia failed");
 883                 return -ENODEV;
 884         }
 885
 886         mos7840_port = mos7840_get_port_private(port);
 887         port0 = mos7840_get_port_private(serial->port[0]);
 888
 889         if (mos7840_port == NULL || port0 == NULL)
 890                 return -ENODEV;
 891
 892         usb_clear_halt(serial->dev, port->write_urb->pipe);
 893         usb_clear_halt(serial->dev, port->read_urb->pipe);
 894         port0->open_ports++;
 895
 896         /* Initialising the write urb pool */
 897         for (j = 0; j < NUM_URBS; ++j) {
 898                 urb = usb_alloc_urb(0, GFP_KERNEL);
 899                 mos7840_port->write_urb_pool[j] = urb;
 900
 901                 if (urb == NULL) {
 902                         dev_err(&port->dev, "No more urbs???\n");
 903                         continue;
 904                 }
 905
 906                 urb->transfer_buffer = kmalloc(URB_TRANSFER_BUFFER_SIZE,
 907                                                                 GFP_KERNEL);
 908                 if (!urb->transfer_buffer) {
 909                         usb_free_urb(urb);
 910                         mos7840_port->write_urb_pool[j] = NULL;
 911                         dev_err(&port->dev,
 912                                 "%s-out of memory for urb buffers.\n",
 913                                 __func__);
 914                         continue;
 915                 }
 916         }
 917
 918 /*****************************************************************************
 919  * Initialize MCS7840 -- Write Init values to corresponding Registers
 920  *
 921  * Register Index
 922  * 1 : IER
 923  * 2 : FCR
 924  * 3 : LCR
 925  * 4 : MCR
 926  *
 927  * 0x08 : SP1/2 Control Reg
 928  *****************************************************************************/
 929
 930         /* NEED to check the following Block */
 931
 932         Data = 0x0;
 933         status = mos7840_get_reg_sync(port, mos7840_port->SpRegOffset, &Data);
 934         if (status < 0) {
 935                 dbg("Reading Spreg failed");
 936                 return -1;
 937         }
 938         Data |= 0x80;
 939         status = mos7840_set_reg_sync(port, mos7840_port->SpRegOffset, Data);
 940         if (status < 0) {
 941                 dbg("writing Spreg failed");
 942                 return -1;
 943         }
 944
 945         Data &= ~0x80;
 946         status = mos7840_set_reg_sync(port, mos7840_port->SpRegOffset, Data);
 947         if (status < 0) {
 948                 dbg("writing Spreg failed");
 949                 return -1;
 950         }
 951         /* End of block to be checked */
 952
 953         Data = 0x0;
 954         status = mos7840_get_reg_sync(port, mos7840_port->ControlRegOffset,
 955                                                                         &Data);
 956         if (status < 0) {
 957                 dbg("Reading Controlreg failed");
 958                 return -1;
 959         }
 960         Data |= 0x08;           /* Driver done bit */
 961         Data |= 0x20;           /* rx_disable */
 962         status = mos7840_set_reg_sync(port,
 963                                 mos7840_port->ControlRegOffset, Data);
 964         if (status < 0) {
 965                 dbg("writing Controlreg failed");
 966                 return -1;
 967         }
 968         /* do register settings here */
 969         /* Set all regs to the device default values. */
 970         /***********************************
 971          * First Disable all interrupts.
 972          ***********************************/
 973         Data = 0x00;
 974         status = mos7840_set_uart_reg(port, INTERRUPT_ENABLE_REGISTER, Data);
 975         if (status < 0) {
 976                 dbg("disabling interrupts failed");
 977                 return -1;
 978         }
 979         /* Set FIFO_CONTROL_REGISTER to the default value */
 980         Data = 0x00;
 981         status = mos7840_set_uart_reg(port, FIFO_CONTROL_REGISTER, Data);
 982         if (status < 0) {
 983                 dbg("Writing FIFO_CONTROL_REGISTER  failed");
 984                 return -1;
 985         }
 986
 987         Data = 0xcf;
 988         status = mos7840_set_uart_reg(port, FIFO_CONTROL_REGISTER, Data);
 989         if (status < 0) {
 990                 dbg("Writing FIFO_CONTROL_REGISTER  failed");
 991                 return -1;
 992         }
 993
 994         Data = 0x03;
 995         status = mos7840_set_uart_reg(port, LINE_CONTROL_REGISTER, Data);
 996         mos7840_port->shadowLCR = Data;
 997
 998         Data = 0x0b;
 999         status = mos7840_set_uart_reg(port, MODEM_CONTROL_REGISTER, Data);
1000         mos7840_port->shadowMCR = Data;
1001
1002         Data = 0x00;
1003         status = mos7840_get_uart_reg(port, LINE_CONTROL_REGISTER, &Data);
1004         mos7840_port->shadowLCR = Data;
1005
1006         Data |= SERIAL_LCR_DLAB;        /* data latch enable in LCR 0x80 */
1007         status = mos7840_set_uart_reg(port, LINE_CONTROL_REGISTER, Data);
1008
1009         Data = 0x0c;
1010         status = mos7840_set_uart_reg(port, DIVISOR_LATCH_LSB, Data);
1011
1012         Data = 0x0;
1013         status = mos7840_set_uart_reg(port, DIVISOR_LATCH_MSB, Data);
1014
1015         Data = 0x00;
1016         status = mos7840_get_uart_reg(port, LINE_CONTROL_REGISTER, &Data);
1017
1018         Data = Data & ~SERIAL_LCR_DLAB;
1019         status = mos7840_set_uart_reg(port, LINE_CONTROL_REGISTER, Data);
1020         mos7840_port->shadowLCR = Data;
1021
1022         /* clearing Bulkin and Bulkout Fifo */
1023         Data = 0x0;
1024         status = mos7840_get_reg_sync(port, mos7840_port->SpRegOffset, &Data);
1025
1026         Data = Data | 0x0c;
1027         status = mos7840_set_reg_sync(port, mos7840_port->SpRegOffset, Data);
1028
1029         Data = Data & ~0x0c;
1030         status = mos7840_set_reg_sync(port, mos7840_port->SpRegOffset, Data);
1031         /* Finally enable all interrupts */
1032         Data = 0x0c;
1033         status = mos7840_set_uart_reg(port, INTERRUPT_ENABLE_REGISTER, Data);
1034
1035         /* clearing rx_disable */
1036         Data = 0x0;
1037         status = mos7840_get_reg_sync(port, mos7840_port->ControlRegOffset,
1038                                                                         &Data);
1039         Data = Data & ~0x20;
1040         status = mos7840_set_reg_sync(port, mos7840_port->ControlRegOffset,
1041                                                                         Data);
1042
1043         /* rx_negate */
1044         Data = 0x0;
1045         status = mos7840_get_reg_sync(port, mos7840_port->ControlRegOffset,
1046                                                                         &Data);
1047         Data = Data | 0x10;
1048         status = mos7840_set_reg_sync(port, mos7840_port->ControlRegOffset,
1049                                                                         Data);
1050
1051         /* Check to see if we've set up our endpoint info yet    *
1052          * (can't set it up in mos7840_startup as the structures *
1053          * were not set up at that time.)                        */
1054         if (port0->open_ports == 1) {
1055                 if (serial->port[0]->interrupt_in_buffer == NULL) {
1056                         /* set up interrupt urb */
1057                         usb_fill_int_urb(serial->port[0]->interrupt_in_urb,
1058                                 serial->dev,
1059                                 usb_rcvintpipe(serial->dev,
1060                                 serial->port[0]->interrupt_in_endpointAddress),
1061                                 serial->port[0]->interrupt_in_buffer,
1062                                 serial->port[0]->interrupt_in_urb->
1063                                 transfer_buffer_length,
1064                                 mos7840_interrupt_callback,
1065                                 serial,
1066                                 serial->port[0]->interrupt_in_urb->interval);
1067
1068                         /* start interrupt read for mos7840               *
1069                          * will continue as long as mos7840 is connected  */
1070
1071                         response =
1072                             usb_submit_urb(serial->port[0]->interrupt_in_urb,
1073                                            GFP_KERNEL);
1074                         if (response) {
1075                                 dev_err(&port->dev, "%s - Error %d submitting "
1076                                         "interrupt urb\n", __func__, response);
1077                         }
1078
1079                 }
1080
1081         }
1082
1083         /* see if we've set up our endpoint info yet   *
1084          * (can't set it up in mos7840_startup as the  *
1085          * structures were not set up at that time.)   */
1086
1087         dbg("port number is %d", port->number);
1088         dbg("serial number is %d", port->serial->minor);
1089         dbg("Bulkin endpoint is %d", port->bulk_in_endpointAddress);
1090         dbg("BulkOut endpoint is %d", port->bulk_out_endpointAddress);
1091         dbg("Interrupt endpoint is %d", port->interrupt_in_endpointAddress);
1092         dbg("port's number in the device is %d", mos7840_port->port_num);
1093         mos7840_port->read_urb = port->read_urb;
1094
1095         /* set up our bulk in urb */
1096
1097         usb_fill_bulk_urb(mos7840_port->read_urb,
1098                           serial->dev,
1099                           usb_rcvbulkpipe(serial->dev,
1100                                           port->bulk_in_endpointAddress),
1101                           port->bulk_in_buffer,
1102                           mos7840_port->read_urb->transfer_buffer_length,
1103                           mos7840_bulk_in_callback, mos7840_port);
1104
1105         dbg("mos7840_open: bulkin endpoint is %d",
1106             port->bulk_in_endpointAddress);
1107         mos7840_port->read_urb_busy = true;
1108         response = usb_submit_urb(mos7840_port->read_urb, GFP_KERNEL);
1109         if (response) {
1110                 dev_err(&port->dev, "%s - Error %d submitting control urb\n",
1111                         __func__, response);
1112                 mos7840_port->read_urb_busy = false;
1113         }
1114
1115         /* initialize our wait queues */
1116         init_waitqueue_head(&mos7840_port->wait_chase);
1117         init_waitqueue_head(&mos7840_port->delta_msr_wait);
1118
1119         /* initialize our icount structure */
1120         memset(&(mos7840_port->icount), 0x00, sizeof(mos7840_port->icount));
1121
1122         /* initialize our port settings */
1123         /* Must set to enable ints! */
1124         mos7840_port->shadowMCR = MCR_MASTER_IE;
1125         /* send a open port command */
1126         mos7840_port->open = 1;
1127         /* mos7840_change_port_settings(mos7840_port,old_termios); */
1128         mos7840_port->icount.tx = 0;
1129         mos7840_port->icount.rx = 0;
1130
1131         dbg("usb_serial serial:%p       mos7840_port:%p\n      usb_serial_port port:%p",
1132                                 serial, mos7840_port, port);
1133
1134         dbg ("%s leave", __func__);
1135
1136         return 0;
1137
1138 }
1139
1140 /*****************************************************************************
1141  * mos7840_chars_in_buffer
1142  *      this function is called by the tty driver when it wants to know how many
1143  *      bytes of data we currently have outstanding in the port (data that has
1144  *      been written, but hasn't made it out the port yet)
1145  *      If successful, we return the number of bytes left to be written in the
1146  *      system,
1147  *      Otherwise we return zero.
1148  *****************************************************************************/
1149
1150 static int mos7840_chars_in_buffer(struct tty_struct *tty)
1151 {
1152         struct usb_serial_port *port = tty->driver_data;
1153         int i;
1154         int chars = 0;
1155         unsigned long flags;
1156         struct moschip_port *mos7840_port;
1157
1158         dbg("%s", " mos7840_chars_in_buffer:entering ...........");
1159
1160         if (mos7840_port_paranoia_check(port, __func__)) {
1161                 dbg("%s", "Invalid port");
1162                 return 0;
1163         }
1164
1165         mos7840_port = mos7840_get_port_private(port);
1166         if (mos7840_port == NULL) {
1167                 dbg("%s", "mos7840_break:leaving ...........");
1168                 return 0;
1169         }
1170
1171         spin_lock_irqsave(&mos7840_port->pool_lock, flags);
1172         for (i = 0; i < NUM_URBS; ++i)
1173                 if (mos7840_port->busy[i])
1174                         chars += URB_TRANSFER_BUFFER_SIZE;
1175         spin_unlock_irqrestore(&mos7840_port->pool_lock, flags);
1176         dbg("%s - returns %d", __func__, chars);
1177         return chars;
1178
1179 }
1180
1181 /*****************************************************************************
1182  * mos7840_close
1183  *      this function is called by the tty driver when a port is closed
1184  *****************************************************************************/
1185
1186 static void mos7840_close(struct usb_serial_port *port)
1187 {
1188         struct usb_serial *serial;
1189         struct moschip_port *mos7840_port;
1190         struct moschip_port *port0;
1191         int j;
1192         __u16 Data;
1193
1194         dbg("%s", "mos7840_close:entering...");
1195
1196         if (mos7840_port_paranoia_check(port, __func__)) {
1197                 dbg("%s", "Port Paranoia failed");
1198                 return;
1199         }
1200
1201         serial = mos7840_get_usb_serial(port, __func__);
1202         if (!serial) {
1203                 dbg("%s", "Serial Paranoia failed");
1204                 return;
1205         }
1206
1207         mos7840_port = mos7840_get_port_private(port);
1208         port0 = mos7840_get_port_private(serial->port[0]);
1209
1210         if (mos7840_port == NULL || port0 == NULL)
1211                 return;
1212
1213         for (j = 0; j < NUM_URBS; ++j)
1214                 usb_kill_urb(mos7840_port->write_urb_pool[j]);
1215
1216         /* Freeing Write URBs */
1217         for (j = 0; j < NUM_URBS; ++j) {
1218                 if (mos7840_port->write_urb_pool[j]) {
1219                         if (mos7840_port->write_urb_pool[j]->transfer_buffer)
1220                                 kfree(mos7840_port->write_urb_pool[j]->
1221                                       transfer_buffer);
1222
1223                         usb_free_urb(mos7840_port->write_urb_pool[j]);
1224                 }
1225         }
1226
1227         /* While closing port, shutdown all bulk read, write  *
1228          * and interrupt read if they exists                  */
1229         if (serial->dev) {
1230                 if (mos7840_port->write_urb) {
1231                         dbg("%s", "Shutdown bulk write");
1232                         usb_kill_urb(mos7840_port->write_urb);
1233                 }
1234                 if (mos7840_port->read_urb) {
1235                         dbg("%s", "Shutdown bulk read");
1236                         usb_kill_urb(mos7840_port->read_urb);
1237                         mos7840_port->read_urb_busy = false;
1238                 }
1239                 if ((&mos7840_port->control_urb)) {
1240                         dbg("%s", "Shutdown control read");
1241                         /*/      usb_kill_urb (mos7840_port->control_urb); */
1242                 }
1243         }
1244 /*      if(mos7840_port->ctrl_buf != NULL) */
1245 /*              kfree(mos7840_port->ctrl_buf); */
1246         port0->open_ports--;
1247         dbg("mos7840_num_open_ports in close%d:in port%d",
1248             port0->open_ports, port->number);
1249         if (port0->open_ports == 0) {
1250                 if (serial->port[0]->interrupt_in_urb) {
1251                         dbg("%s", "Shutdown interrupt_in_urb");
1252                         usb_kill_urb(serial->port[0]->interrupt_in_urb);
1253                 }
1254         }
1255
1256         if (mos7840_port->write_urb) {
1257                 /* if this urb had a transfer buffer already (old tx) free it */
1258                 if (mos7840_port->write_urb->transfer_buffer != NULL)
1259                         kfree(mos7840_port->write_urb->transfer_buffer);
1260                 usb_free_urb(mos7840_port->write_urb);
1261         }
1262
1263         Data = 0x0;
1264         mos7840_set_uart_reg(port, MODEM_CONTROL_REGISTER, Data);
1265
1266         Data = 0x00;
1267         mos7840_set_uart_reg(port, INTERRUPT_ENABLE_REGISTER, Data);
1268
1269         mos7840_port->open = 0;
1270
1271         dbg("%s", "Leaving ............");
1272 }
1273
1274 /************************************************************************
1275  *
1276  * mos7840_block_until_chase_response
1277  *
1278  *      This function will block the close until one of the following:
1279  *              1. Response to our Chase comes from mos7840
1280  *              2. A timeout of 10 seconds without activity has expired
1281  *                 (1K of mos7840 data @ 2400 baud ==> 4 sec to empty)
1282  *
1283  ************************************************************************/
1284
1285 static void mos7840_block_until_chase_response(struct tty_struct *tty,
1286                                         struct moschip_port *mos7840_port)
1287 {
1288         int timeout = 1 * HZ;
1289         int wait = 10;
1290         int count;
1291
1292         while (1) {
1293                 count = mos7840_chars_in_buffer(tty);
1294
1295                 /* Check for Buffer status */
1296                 if (count <= 0)
1297                         return;
1298
1299                 /* Block the thread for a while */
1300                 interruptible_sleep_on_timeout(&mos7840_port->wait_chase,
1301                                                timeout);
1302                 /* No activity.. count down section */
1303                 wait--;
1304                 if (wait == 0) {
1305                         dbg("%s - TIMEOUT", __func__);
1306                         return;
1307                 } else {
1308                         /* Reset timeout value back to seconds */
1309                         wait = 10;
1310                 }
1311         }
1312
1313 }
1314
1315 /*****************************************************************************
1316  * mos7840_break
1317  *      this function sends a break to the port
1318  *****************************************************************************/
1319 static void mos7840_break(struct tty_struct *tty, int break_state)
1320 {
1321         struct usb_serial_port *port = tty->driver_data;
1322         unsigned char data;
1323         struct usb_serial *serial;
1324         struct moschip_port *mos7840_port;
1325
1326         dbg("%s", "Entering ...........");
1327         dbg("mos7840_break: Start");
1328
1329         if (mos7840_port_paranoia_check(port, __func__)) {
1330                 dbg("%s", "Port Paranoia failed");
1331                 return;
1332         }
1333
1334         serial = mos7840_get_usb_serial(port, __func__);
1335         if (!serial) {
1336                 dbg("%s", "Serial Paranoia failed");
1337                 return;
1338         }
1339
1340         mos7840_port = mos7840_get_port_private(port);
1341
1342         if (mos7840_port == NULL)
1343                 return;
1344
1345         if (serial->dev)
1346                 /* flush and block until tx is empty */
1347                 mos7840_block_until_chase_response(tty, mos7840_port);
1348
1349         if (break_state == -1)
1350                 data = mos7840_port->shadowLCR | LCR_SET_BREAK;
1351         else
1352                 data = mos7840_port->shadowLCR & ~LCR_SET_BREAK;
1353
1354         /* FIXME: no locking on shadowLCR anywhere in driver */
1355         mos7840_port->shadowLCR = data;
1356         dbg("mcs7840_break mos7840_port->shadowLCR is %x",
1357             mos7840_port->shadowLCR);
1358         mos7840_set_uart_reg(port, LINE_CONTROL_REGISTER,
1359                              mos7840_port->shadowLCR);
1360
1361         return;
1362 }
1363
1364 /*****************************************************************************
1365  * mos7840_write_room
1366  *      this function is called by the tty driver when it wants to know how many
1367  *      bytes of data we can accept for a specific port.
1368  *      If successful, we return the amount of room that we have for this port
1369  *      Otherwise we return a negative error number.
1370  *****************************************************************************/
1371
1372 static int mos7840_write_room(struct tty_struct *tty)
1373 {
1374         struct usb_serial_port *port = tty->driver_data;
1375         int i;
1376         int room = 0;
1377         unsigned long flags;
1378         struct moschip_port *mos7840_port;
1379
1380         dbg("%s", " mos7840_write_room:entering ...........");
1381
1382         if (mos7840_port_paranoia_check(port, __func__)) {
1383                 dbg("%s", "Invalid port");
1384                 dbg("%s", " mos7840_write_room:leaving ...........");
1385                 return -1;
1386         }
1387
1388         mos7840_port = mos7840_get_port_private(port);
1389         if (mos7840_port == NULL) {
1390                 dbg("%s", "mos7840_break:leaving ...........");
1391                 return -1;
1392         }
1393
1394         spin_lock_irqsave(&mos7840_port->pool_lock, flags);
1395         for (i = 0; i < NUM_URBS; ++i) {
1396                 if (!mos7840_port->busy[i])
1397                         room += URB_TRANSFER_BUFFER_SIZE;
1398         }
1399         spin_unlock_irqrestore(&mos7840_port->pool_lock, flags);
1400
1401         room = (room == 0) ? 0 : room - URB_TRANSFER_BUFFER_SIZE + 1;
1402         dbg("%s - returns %d", __func__, room);
1403         return room;
1404
1405 }
1406
1407 /*****************************************************************************
1408  * mos7840_write
1409  *      this function is called by the tty driver when data should be written to
1410  *      the port.
1411  *      If successful, we return the number of bytes written, otherwise we
1412  *      return a negative error number.
1413  *****************************************************************************/
1414
1415 static int mos7840_write(struct tty_struct *tty, struct usb_serial_port *port,
1416                          const unsigned char *data, int count)
1417 {
1418         int status;
1419         int i;
1420         int bytes_sent = 0;
1421         int transfer_size;
1422         unsigned long flags;
1423
1424         struct moschip_port *mos7840_port;
1425         struct usb_serial *serial;
1426         struct urb *urb;
1427         /* __u16 Data; */
1428         const unsigned char *current_position = data;
1429         unsigned char *data1;
1430         dbg("%s", "entering ...........");
1431         /* dbg("mos7840_write: mos7840_port->shadowLCR is %x",
1432                                         mos7840_port->shadowLCR); */
1433
1434 #ifdef NOTMOS7840
1435         Data = 0x00;
1436         status = mos7840_get_uart_reg(port, LINE_CONTROL_REGISTER, &Data);
1437         mos7840_port->shadowLCR = Data;
1438         dbg("mos7840_write: LINE_CONTROL_REGISTER is %x", Data);
1439         dbg("mos7840_write: mos7840_port->shadowLCR is %x",
1440             mos7840_port->shadowLCR);
1441
1442         /* Data = 0x03; */
1443         /* status = mos7840_set_uart_reg(port,LINE_CONTROL_REGISTER,Data); */
1444         /* mos7840_port->shadowLCR=Data;//Need to add later */
1445
1446         Data |= SERIAL_LCR_DLAB;        /* data latch enable in LCR 0x80 */
1447         status = mos7840_set_uart_reg(port, LINE_CONTROL_REGISTER, Data);
1448
1449         /* Data = 0x0c; */
1450         /* status = mos7840_set_uart_reg(port,DIVISOR_LATCH_LSB,Data); */
1451         Data = 0x00;
1452         status = mos7840_get_uart_reg(port, DIVISOR_LATCH_LSB, &Data);
1453         dbg("mos7840_write:DLL value is %x", Data);
1454
1455         Data = 0x0;
1456         status = mos7840_get_uart_reg(port, DIVISOR_LATCH_MSB, &Data);
1457         dbg("mos7840_write:DLM value is %x", Data);
1458
1459         Data = Data & ~SERIAL_LCR_DLAB;
1460         dbg("mos7840_write: mos7840_port->shadowLCR is %x",
1461             mos7840_port->shadowLCR);
1462         status = mos7840_set_uart_reg(port, LINE_CONTROL_REGISTER, Data);
1463 #endif
1464
1465         if (mos7840_port_paranoia_check(port, __func__)) {
1466                 dbg("%s", "Port Paranoia failed");
1467                 return -1;
1468         }
1469
1470         serial = port->serial;
1471         if (mos7840_serial_paranoia_check(serial, __func__)) {
1472                 dbg("%s", "Serial Paranoia failed");
1473                 return -1;
1474         }
1475
1476         mos7840_port = mos7840_get_port_private(port);
1477         if (mos7840_port == NULL) {
1478                 dbg("%s", "mos7840_port is NULL");
1479                 return -1;
1480         }
1481
1482         /* try to find a free urb in the list */
1483         urb = NULL;
1484
1485         spin_lock_irqsave(&mos7840_port->pool_lock, flags);
1486         for (i = 0; i < NUM_URBS; ++i) {
1487                 if (!mos7840_port->busy[i]) {
1488                         mos7840_port->busy[i] = 1;
1489                         urb = mos7840_port->write_urb_pool[i];
1490                         dbg("URB:%d", i);
1491                         break;
1492                 }
1493         }
1494         spin_unlock_irqrestore(&mos7840_port->pool_lock, flags);
1495
1496         if (urb == NULL) {
1497                 dbg("%s - no more free urbs", __func__);
1498                 goto exit;
1499         }
1500
1501         if (urb->transfer_buffer == NULL) {
1502                 urb->transfer_buffer =
1503                     kmalloc(URB_TRANSFER_BUFFER_SIZE, GFP_KERNEL);
1504
1505                 if (urb->transfer_buffer == NULL) {
1506                         dev_err(&port->dev, "%s no more kernel memory...\n",
1507                                 __func__);
1508                         goto exit;
1509                 }
1510         }
1511         transfer_size = min(count, URB_TRANSFER_BUFFER_SIZE);
1512
1513         memcpy(urb->transfer_buffer, current_position, transfer_size);
1514
1515         /* fill urb with data and submit  */
1516         usb_fill_bulk_urb(urb,
1517                           serial->dev,
1518                           usb_sndbulkpipe(serial->dev,
1519                                           port->bulk_out_endpointAddress),
1520                           urb->transfer_buffer,
1521                           transfer_size,
1522                           mos7840_bulk_out_data_callback, mos7840_port);
1523
1524         data1 = urb->transfer_buffer;
1525         dbg("bulkout endpoint is %d", port->bulk_out_endpointAddress);
1526
1527         /* send it down the pipe */
1528         status = usb_submit_urb(urb, GFP_ATOMIC);
1529
1530         if (status) {
1531                 mos7840_port->busy[i] = 0;
1532                 dev_err(&port->dev, "%s - usb_submit_urb(write bulk) failed "
1533                         "with status = %d\n", __func__, status);
1534                 bytes_sent = status;
1535                 goto exit;
1536         }
1537         bytes_sent = transfer_size;
1538         mos7840_port->icount.tx += transfer_size;
1539         smp_wmb();
1540         dbg("mos7840_port->icount.tx is %d:", mos7840_port->icount.tx);
1541 exit:
1542         return bytes_sent;
1543
1544 }
1545
1546 /*****************************************************************************
1547  * mos7840_throttle
1548  *      this function is called by the tty driver when it wants to stop the data
1549  *      being read from the port.
1550  *****************************************************************************/
1551
1552 static void mos7840_throttle(struct tty_struct *tty)
1553 {
1554         struct usb_serial_port *port = tty->driver_data;
1555         struct moschip_port *mos7840_port;
1556         int status;
1557
1558         if (mos7840_port_paranoia_check(port, __func__)) {
1559                 dbg("%s", "Invalid port");
1560                 return;
1561         }
1562
1563         dbg("- port %d", port->number);
1564
1565         mos7840_port = mos7840_get_port_private(port);
1566
1567         if (mos7840_port == NULL)
1568                 return;
1569
1570         if (!mos7840_port->open) {
1571                 dbg("%s", "port not opened");
1572                 return;
1573         }
1574
1575         dbg("%s", "Entering ..........");
1576
1577         /* if we are implementing XON/XOFF, send the stop character */
1578         if (I_IXOFF(tty)) {
1579                 unsigned char stop_char = STOP_CHAR(tty);
1580                 status = mos7840_write(tty, port, &stop_char, 1);
1581                 if (status <= 0)
1582                         return;
1583         }
1584         /* if we are implementing RTS/CTS, toggle that line */
1585         if (tty->termios->c_cflag & CRTSCTS) {
1586                 mos7840_port->shadowMCR &= ~MCR_RTS;
1587                 status = mos7840_set_uart_reg(port, MODEM_CONTROL_REGISTER,
1588                                          mos7840_port->shadowMCR);
1589                 if (status < 0)
1590                         return;
1591         }
1592
1593         return;
1594 }
1595
1596 /*****************************************************************************
1597  * mos7840_unthrottle
1598  *      this function is called by the tty driver when it wants to resume
1599  *      the data being read from the port (called after mos7840_throttle is
1600  *      called)
1601  *****************************************************************************/
1602 static void mos7840_unthrottle(struct tty_struct *tty)
1603 {
1604         struct usb_serial_port *port = tty->driver_data;
1605         int status;
1606         struct moschip_port *mos7840_port = mos7840_get_port_private(port);
1607
1608         if (mos7840_port_paranoia_check(port, __func__)) {
1609                 dbg("%s", "Invalid port");
1610                 return;
1611         }
1612
1613         if (mos7840_port == NULL)
1614                 return;
1615
1616         if (!mos7840_port->open) {
1617                 dbg("%s - port not opened", __func__);
1618                 return;
1619         }
1620
1621         dbg("%s", "Entering ..........");
1622
1623         /* if we are implementing XON/XOFF, send the start character */
1624         if (I_IXOFF(tty)) {
1625                 unsigned char start_char = START_CHAR(tty);
1626                 status = mos7840_write(tty, port, &start_char, 1);
1627                 if (status <= 0)
1628                         return;
1629         }
1630
1631         /* if we are implementing RTS/CTS, toggle that line */
1632         if (tty->termios->c_cflag & CRTSCTS) {
1633                 mos7840_port->shadowMCR |= MCR_RTS;
1634                 status = mos7840_set_uart_reg(port, MODEM_CONTROL_REGISTER,
1635                                          mos7840_port->shadowMCR);
1636                 if (status < 0)
1637                         return;
1638         }
1639 }
1640
1641 static int mos7840_tiocmget(struct tty_struct *tty, struct file *file)
1642 {
1643         struct usb_serial_port *port = tty->driver_data;
1644         struct moschip_port *mos7840_port;
1645         unsigned int result;
1646         __u16 msr;
1647         __u16 mcr;
1648         int status;
1649         mos7840_port = mos7840_get_port_private(port);
1650
1651         dbg("%s - port %d", __func__, port->number);
1652
1653         if (mos7840_port == NULL)
1654                 return -ENODEV;
1655
1656         status = mos7840_get_uart_reg(port, MODEM_STATUS_REGISTER, &msr);
1657         status = mos7840_get_uart_reg(port, MODEM_CONTROL_REGISTER, &mcr);
1658         result = ((mcr & MCR_DTR) ? TIOCM_DTR : 0)
1659             | ((mcr & MCR_RTS) ? TIOCM_RTS : 0)
1660             | ((mcr & MCR_LOOPBACK) ? TIOCM_LOOP : 0)
1661             | ((msr & MOS7840_MSR_CTS) ? TIOCM_CTS : 0)
1662             | ((msr & MOS7840_MSR_CD) ? TIOCM_CAR : 0)
1663             | ((msr & MOS7840_MSR_RI) ? TIOCM_RI : 0)
1664             | ((msr & MOS7840_MSR_DSR) ? TIOCM_DSR : 0);
1665
1666         dbg("%s - 0x%04X", __func__, result);
1667
1668         return result;
1669 }
1670
1671 static int mos7840_tiocmset(struct tty_struct *tty, struct file *file,
1672                             unsigned int set, unsigned int clear)
1673 {
1674         struct usb_serial_port *port = tty->driver_data;
1675         struct moschip_port *mos7840_port;
1676         unsigned int mcr;
1677         int status;
1678
1679         dbg("%s - port %d", __func__, port->number);
1680
1681         mos7840_port = mos7840_get_port_private(port);
1682
1683         if (mos7840_port == NULL)
1684                 return -ENODEV;
1685
1686         /* FIXME: What locks the port registers ? */
1687         mcr = mos7840_port->shadowMCR;
1688         if (clear & TIOCM_RTS)
1689                 mcr &= ~MCR_RTS;
1690         if (clear & TIOCM_DTR)
1691                 mcr &= ~MCR_DTR;
1692         if (clear & TIOCM_LOOP)
1693                 mcr &= ~MCR_LOOPBACK;
1694
1695         if (set & TIOCM_RTS)
1696                 mcr |= MCR_RTS;
1697         if (set & TIOCM_DTR)
1698                 mcr |= MCR_DTR;
1699         if (set & TIOCM_LOOP)
1700                 mcr |= MCR_LOOPBACK;
1701
1702         mos7840_port->shadowMCR = mcr;
1703
1704         status = mos7840_set_uart_reg(port, MODEM_CONTROL_REGISTER, mcr);
1705         if (status < 0) {
1706                 dbg("setting MODEM_CONTROL_REGISTER Failed");
1707                 return status;
1708         }
1709
1710         return 0;
1711 }
1712
1713 /*****************************************************************************
1714  * mos7840_calc_baud_rate_divisor
1715  *      this function calculates the proper baud rate divisor for the specified
1716  *      baud rate.
1717  *****************************************************************************/
1718 static int mos7840_calc_baud_rate_divisor(int baudRate, int *divisor,
1719                                           __u16 *clk_sel_val)
1720 {
1721
1722         dbg("%s - %d", __func__, baudRate);
1723
1724         if (baudRate <= 115200) {
1725                 *divisor = 115200 / baudRate;
1726                 *clk_sel_val = 0x0;
1727         }
1728         if ((baudRate > 115200) && (baudRate <= 230400)) {
1729                 *divisor = 230400 / baudRate;
1730                 *clk_sel_val = 0x10;
1731         } else if ((baudRate > 230400) && (baudRate <= 403200)) {
1732                 *divisor = 403200 / baudRate;
1733                 *clk_sel_val = 0x20;
1734         } else if ((baudRate > 403200) && (baudRate <= 460800)) {
1735                 *divisor = 460800 / baudRate;
1736                 *clk_sel_val = 0x30;
1737         } else if ((baudRate > 460800) && (baudRate <= 806400)) {
1738                 *divisor = 806400 / baudRate;
1739                 *clk_sel_val = 0x40;
1740         } else if ((baudRate > 806400) && (baudRate <= 921600)) {
1741                 *divisor = 921600 / baudRate;
1742                 *clk_sel_val = 0x50;
1743         } else if ((baudRate > 921600) && (baudRate <= 1572864)) {
1744                 *divisor = 1572864 / baudRate;
1745                 *clk_sel_val = 0x60;
1746         } else if ((baudRate > 1572864) && (baudRate <= 3145728)) {
1747                 *divisor = 3145728 / baudRate;
1748                 *clk_sel_val = 0x70;
1749         }
1750         return 0;
1751
1752 #ifdef NOTMCS7840
1753
1754         for (i = 0; i < ARRAY_SIZE(mos7840_divisor_table); i++) {
1755                 if (mos7840_divisor_table[i].BaudRate == baudrate) {
1756                         *divisor = mos7840_divisor_table[i].Divisor;
1757                         return 0;
1758                 }
1759         }
1760
1761         /* After trying for all the standard baud rates    *
1762          * Try calculating the divisor for this baud rate  */
1763
1764         if (baudrate > 75 && baudrate < 230400) {
1765                 /* get the divisor */
1766                 custom = (__u16) (230400L / baudrate);
1767
1768                 /* Check for round off */
1769                 round1 = (__u16) (2304000L / baudrate);
1770                 round = (__u16) (round1 - (custom * 10));
1771                 if (round > 4)
1772                         custom++;
1773                 *divisor = custom;
1774
1775                 dbg(" Baud %d = %d", baudrate, custom);
1776                 return 0;
1777         }
1778
1779         dbg("%s", " Baud calculation Failed...");
1780         return -1;
1781 #endif
1782 }
1783
1784 /*****************************************************************************
1785  * mos7840_send_cmd_write_baud_rate
1786  *      this function sends the proper command to change the baud rate of the
1787  *      specified port.
1788  *****************************************************************************/
1789
1790 static int mos7840_send_cmd_write_baud_rate(struct moschip_port *mos7840_port,
1791                                             int baudRate)
1792 {
1793         int divisor = 0;
1794         int status;
1795         __u16 Data;
1796         unsigned char number;
1797         __u16 clk_sel_val;
1798         struct usb_serial_port *port;
1799
1800         if (mos7840_port == NULL)
1801                 return -1;
1802
1803         port = (struct usb_serial_port *)mos7840_port->port;
1804         if (mos7840_port_paranoia_check(port, __func__)) {
1805                 dbg("%s", "Invalid port");
1806                 return -1;
1807         }
1808
1809         if (mos7840_serial_paranoia_check(port->serial, __func__)) {
1810                 dbg("%s", "Invalid Serial");
1811                 return -1;
1812         }
1813
1814         dbg("%s", "Entering ..........");
1815
1816         number = mos7840_port->port->number - mos7840_port->port->serial->minor;
1817
1818         dbg("%s - port = %d, baud = %d", __func__,
1819             mos7840_port->port->number, baudRate);
1820         /* reset clk_uart_sel in spregOffset */
1821         if (baudRate > 115200) {
1822 #ifdef HW_flow_control
1823                 /* NOTE: need to see the pther register to modify */
1824                 /* setting h/w flow control bit to 1 */
1825                 Data = 0x2b;
1826                 mos7840_port->shadowMCR = Data;
1827                 status = mos7840_set_uart_reg(port, MODEM_CONTROL_REGISTER,
1828                                                                         Data);
1829                 if (status < 0) {
1830                         dbg("Writing spreg failed in set_serial_baud");
1831                         return -1;
1832                 }
1833 #endif
1834
1835         } else {
1836 #ifdef HW_flow_control
1837                 / *setting h/w flow control bit to 0 */
1838                 Data = 0xb;
1839                 mos7840_port->shadowMCR = Data;
1840                 status = mos7840_set_uart_reg(port, MODEM_CONTROL_REGISTER,
1841                                                                         Data);
1842                 if (status < 0) {
1843                         dbg("Writing spreg failed in set_serial_baud");
1844                         return -1;
1845                 }
1846 #endif
1847
1848         }
1849
1850         if (1) {                /* baudRate <= 115200) */
1851                 clk_sel_val = 0x0;
1852                 Data = 0x0;
1853                 status = mos7840_calc_baud_rate_divisor(baudRate, &divisor,
1854                                                    &clk_sel_val);
1855                 status = mos7840_get_reg_sync(port, mos7840_port->SpRegOffset,
1856                                                                  &Data);
1857                 if (status < 0) {
1858                         dbg("reading spreg failed in set_serial_baud");
1859                         return -1;
1860                 }
1861                 Data = (Data & 0x8f) | clk_sel_val;
1862                 status = mos7840_set_reg_sync(port, mos7840_port->SpRegOffset,
1863                                                                 Data);
1864                 if (status < 0) {
1865                         dbg("Writing spreg failed in set_serial_baud");
1866                         return -1;
1867                 }
1868                 /* Calculate the Divisor */
1869
1870                 if (status) {
1871                         dev_err(&port->dev, "%s - bad baud rate\n", __func__);
1872                         return status;
1873                 }
1874                 /* Enable access to divisor latch */
1875                 Data = mos7840_port->shadowLCR | SERIAL_LCR_DLAB;
1876                 mos7840_port->shadowLCR = Data;
1877                 mos7840_set_uart_reg(port, LINE_CONTROL_REGISTER, Data);
1878
1879                 /* Write the divisor */
1880                 Data = (unsigned char)(divisor & 0xff);
1881                 dbg("set_serial_baud Value to write DLL is %x", Data);
1882                 mos7840_set_uart_reg(port, DIVISOR_LATCH_LSB, Data);
1883
1884                 Data = (unsigned char)((divisor & 0xff00) >> 8);
1885                 dbg("set_serial_baud Value to write DLM is %x", Data);
1886                 mos7840_set_uart_reg(port, DIVISOR_LATCH_MSB, Data);
1887
1888                 /* Disable access to divisor latch */
1889                 Data = mos7840_port->shadowLCR & ~SERIAL_LCR_DLAB;
1890                 mos7840_port->shadowLCR = Data;
1891                 mos7840_set_uart_reg(port, LINE_CONTROL_REGISTER, Data);
1892
1893         }
1894         return status;
1895 }
1896
1897 /*****************************************************************************
1898  * mos7840_change_port_settings
1899  *      This routine is called to set the UART on the device to match
1900  *      the specified new settings.
1901  *****************************************************************************/
1902
1903 static void mos7840_change_port_settings(struct tty_struct *tty,
1904         struct moschip_port *mos7840_port, struct ktermios *old_termios)
1905 {
1906         int baud;
1907         unsigned cflag;
1908         unsigned iflag;
1909         __u8 lData;
1910         __u8 lParity;
1911         __u8 lStop;
1912         int status;
1913         __u16 Data;
1914         struct usb_serial_port *port;
1915         struct usb_serial *serial;
1916
1917         if (mos7840_port == NULL)
1918                 return;
1919
1920         port = (struct usb_serial_port *)mos7840_port->port;
1921
1922         if (mos7840_port_paranoia_check(port, __func__)) {
1923                 dbg("%s", "Invalid port");
1924                 return;
1925         }
1926
1927         if (mos7840_serial_paranoia_check(port->serial, __func__)) {
1928                 dbg("%s", "Invalid Serial");
1929                 return;
1930         }
1931
1932         serial = port->serial;
1933
1934         dbg("%s - port %d", __func__, mos7840_port->port->number);
1935
1936         if (!mos7840_port->open) {
1937                 dbg("%s - port not opened", __func__);
1938                 return;
1939         }
1940
1941         dbg("%s", "Entering ..........");
1942
1943         lData = LCR_BITS_8;
1944         lStop = LCR_STOP_1;
1945         lParity = LCR_PAR_NONE;
1946
1947         cflag = tty->termios->c_cflag;
1948         iflag = tty->termios->c_iflag;
1949
1950         /* Change the number of bits */
1951         if (cflag & CSIZE) {
1952                 switch (cflag & CSIZE) {
1953                 case CS5:
1954                         lData = LCR_BITS_5;
1955                         break;
1956
1957                 case CS6:
1958                         lData = LCR_BITS_6;
1959                         break;
1960
1961                 case CS7:
1962                         lData = LCR_BITS_7;
1963                         break;
1964                 default:
1965                 case CS8:
1966                         lData = LCR_BITS_8;
1967                         break;
1968                 }
1969         }
1970         /* Change the Parity bit */
1971         if (cflag & PARENB) {
1972                 if (cflag & PARODD) {
1973                         lParity = LCR_PAR_ODD;
1974                         dbg("%s - parity = odd", __func__);
1975                 } else {
1976                         lParity = LCR_PAR_EVEN;
1977                         dbg("%s - parity = even", __func__);
1978                 }
1979
1980         } else {
1981                 dbg("%s - parity = none", __func__);
1982         }
1983
1984         if (cflag & CMSPAR)
1985                 lParity = lParity | 0x20;
1986
1987         /* Change the Stop bit */
1988         if (cflag & CSTOPB) {
1989                 lStop = LCR_STOP_2;
1990                 dbg("%s - stop bits = 2", __func__);
1991         } else {
1992                 lStop = LCR_STOP_1;
1993                 dbg("%s - stop bits = 1", __func__);
1994         }
1995
1996         /* Update the LCR with the correct value */
1997         mos7840_port->shadowLCR &=
1998             ~(LCR_BITS_MASK | LCR_STOP_MASK | LCR_PAR_MASK);
1999         mos7840_port->shadowLCR |= (lData | lParity | lStop);
2000
2001         dbg("mos7840_change_port_settings mos7840_port->shadowLCR is %x",
2002             mos7840_port->shadowLCR);
2003         /* Disable Interrupts */
2004         Data = 0x00;
2005         mos7840_set_uart_reg(port, INTERRUPT_ENABLE_REGISTER, Data);
2006
2007         Data = 0x00;
2008         mos7840_set_uart_reg(port, FIFO_CONTROL_REGISTER, Data);
2009
2010         Data = 0xcf;
2011         mos7840_set_uart_reg(port, FIFO_CONTROL_REGISTER, Data);
2012
2013         /* Send the updated LCR value to the mos7840 */
2014         Data = mos7840_port->shadowLCR;
2015
2016         mos7840_set_uart_reg(port, LINE_CONTROL_REGISTER, Data);
2017
2018         Data = 0x00b;
2019         mos7840_port->shadowMCR = Data;
2020         mos7840_set_uart_reg(port, MODEM_CONTROL_REGISTER, Data);
2021         Data = 0x00b;
2022         mos7840_set_uart_reg(port, MODEM_CONTROL_REGISTER, Data);
2023
2024         /* set up the MCR register and send it to the mos7840 */
2025
2026         mos7840_port->shadowMCR = MCR_MASTER_IE;
2027         if (cflag & CBAUD)
2028                 mos7840_port->shadowMCR |= (MCR_DTR | MCR_RTS);
2029
2030         if (cflag & CRTSCTS)
2031                 mos7840_port->shadowMCR |= (MCR_XON_ANY);
2032         else
2033                 mos7840_port->shadowMCR &= ~(MCR_XON_ANY);
2034
2035         Data = mos7840_port->shadowMCR;
2036         mos7840_set_uart_reg(port, MODEM_CONTROL_REGISTER, Data);
2037
2038         /* Determine divisor based on baud rate */
2039         baud = tty_get_baud_rate(tty);
2040
2041         if (!baud) {
2042                 /* pick a default, any default... */
2043                 dbg("%s", "Picked default baud...");
2044                 baud = 9600;
2045         }
2046
2047         dbg("%s - baud rate = %d", __func__, baud);
2048         status = mos7840_send_cmd_write_baud_rate(mos7840_port, baud);
2049
2050         /* Enable Interrupts */
2051         Data = 0x0c;
2052         mos7840_set_uart_reg(port, INTERRUPT_ENABLE_REGISTER, Data);
2053
2054         if (mos7840_port->read_urb_busy == false) {
2055                 mos7840_port->read_urb->dev = serial->dev;
2056                 mos7840_port->read_urb_busy = true;
2057                 status = usb_submit_urb(mos7840_port->read_urb, GFP_ATOMIC);
2058                 if (status) {
2059                         dbg("usb_submit_urb(read bulk) failed, status = %d",
2060                             status);
2061                         mos7840_port->read_urb_busy = false;
2062                 }
2063         }
2064         wake_up(&mos7840_port->delta_msr_wait);
2065         mos7840_port->delta_msr_cond = 1;
2066         dbg("mos7840_change_port_settings mos7840_port->shadowLCR is End %x",
2067             mos7840_port->shadowLCR);
2068
2069         return;
2070 }
2071
2072 /*****************************************************************************
2073  * mos7840_set_termios
2074  *      this function is called by the tty driver when it wants to change
2075  *      the termios structure
2076  *****************************************************************************/
2077
2078 static void mos7840_set_termios(struct tty_struct *tty,
2079                                 struct usb_serial_port *port,
2080                                 struct ktermios *old_termios)
2081 {
2082         int status;
2083         unsigned int cflag;
2084         struct usb_serial *serial;
2085         struct moschip_port *mos7840_port;
2086         dbg("mos7840_set_termios: START");
2087         if (mos7840_port_paranoia_check(port, __func__)) {
2088                 dbg("%s", "Invalid port");
2089                 return;
2090         }
2091
2092         serial = port->serial;
2093
2094         if (mos7840_serial_paranoia_check(serial, __func__)) {
2095                 dbg("%s", "Invalid Serial");
2096                 return;
2097         }
2098
2099         mos7840_port = mos7840_get_port_private(port);
2100
2101         if (mos7840_port == NULL)
2102                 return;
2103
2104         if (!mos7840_port->open) {
2105                 dbg("%s - port not opened", __func__);
2106                 return;
2107         }
2108
2109         dbg("%s", "setting termios - ");
2110
2111         cflag = tty->termios->c_cflag;
2112
2113         dbg("%s - clfag %08x iflag %08x", __func__,
2114             tty->termios->c_cflag, RELEVANT_IFLAG(tty->termios->c_iflag));
2115         dbg("%s - old clfag %08x old iflag %08x", __func__,
2116             old_termios->c_cflag, RELEVANT_IFLAG(old_termios->c_iflag));
2117         dbg("%s - port %d", __func__, port->number);
2118
2119         /* change the port settings to the new ones specified */
2120
2121         mos7840_change_port_settings(tty, mos7840_port, old_termios);
2122
2123         if (!mos7840_port->read_urb) {
2124                 dbg("%s", "URB KILLED !!!!!");
2125                 return;
2126         }
2127
2128         if (mos7840_port->read_urb_busy == false) {
2129                 mos7840_port->read_urb->dev = serial->dev;
2130                 mos7840_port->read_urb_busy = true;
2131                 status = usb_submit_urb(mos7840_port->read_urb, GFP_ATOMIC);
2132                 if (status) {
2133                         dbg("usb_submit_urb(read bulk) failed, status = %d",
2134                             status);
2135                         mos7840_port->read_urb_busy = false;
2136                 }
2137         }
2138         return;
2139 }
2140
2141 /*****************************************************************************
2142  * mos7840_get_lsr_info - get line status register info
2143  *
2144  * Purpose: Let user call ioctl() to get info when the UART physically
2145  *          is emptied.  On bus types like RS485, the transmitter must
2146  *          release the bus after transmitting. This must be done when
2147  *          the transmit shift register is empty, not be done when the
2148  *          transmit holding register is empty.  This functionality
2149  *          allows an RS485 driver to be written in user space.
2150  *****************************************************************************/
2151
2152 static int mos7840_get_lsr_info(struct tty_struct *tty,
2153                                 unsigned int __user *value)
2154 {
2155         int count;
2156         unsigned int result = 0;
2157
2158         count = mos7840_chars_in_buffer(tty);
2159         if (count == 0) {
2160                 dbg("%s -- Empty", __func__);
2161                 result = TIOCSER_TEMT;
2162         }
2163
2164         if (copy_to_user(value, &result, sizeof(int)))
2165                 return -EFAULT;
2166         return 0;
2167 }
2168
2169 /*****************************************************************************
2170  * mos7840_get_serial_info
2171  *      function to get information about serial port
2172  *****************************************************************************/
2173
2174 static int mos7840_get_serial_info(struct moschip_port *mos7840_port,
2175                                    struct serial_struct __user *retinfo)
2176 {
2177         struct serial_struct tmp;
2178
2179         if (mos7840_port == NULL)
2180                 return -1;
2181
2182         if (!retinfo)
2183                 return -EFAULT;
2184
2185         memset(&tmp, 0, sizeof(tmp));
2186
2187         tmp.type = PORT_16550A;
2188         tmp.line = mos7840_port->port->serial->minor;
2189         tmp.port = mos7840_port->port->number;
2190         tmp.irq = 0;
2191         tmp.flags = ASYNC_SKIP_TEST | ASYNC_AUTO_IRQ;
2192         tmp.xmit_fifo_size = NUM_URBS * URB_TRANSFER_BUFFER_SIZE;
2193         tmp.baud_base = 9600;
2194         tmp.close_delay = 5 * HZ;
2195         tmp.closing_wait = 30 * HZ;
2196
2197         if (copy_to_user(retinfo, &tmp, sizeof(*retinfo)))
2198                 return -EFAULT;
2199         return 0;
2200 }
2201
2202 /*****************************************************************************
2203  * SerialIoctl
2204  *      this function handles any ioctl calls to the driver
2205  *****************************************************************************/
2206
2207 static int mos7840_ioctl(struct tty_struct *tty, struct file *file,
2208                          unsigned int cmd, unsigned long arg)
2209 {
2210         struct usb_serial_port *port = tty->driver_data;
2211         void __user *argp = (void __user *)arg;
2212         struct moschip_port *mos7840_port;
2213
2214         struct async_icount cnow;
2215         struct async_icount cprev;
2216         struct serial_icounter_struct icount;
2217
2218         if (mos7840_port_paranoia_check(port, __func__)) {
2219                 dbg("%s", "Invalid port");
2220                 return -1;
2221         }
2222
2223         mos7840_port = mos7840_get_port_private(port);
2224
2225         if (mos7840_port == NULL)
2226                 return -1;
2227
2228         dbg("%s - port %d, cmd = 0x%x", __func__, port->number, cmd);
2229
2230         switch (cmd) {
2231                 /* return number of bytes available */
2232
2233         case TIOCSERGETLSR:
2234                 dbg("%s (%d) TIOCSERGETLSR", __func__, port->number);
2235                 return mos7840_get_lsr_info(tty, argp);
2236                 return 0;
2237
2238         case TIOCGSERIAL:
2239                 dbg("%s (%d) TIOCGSERIAL", __func__, port->number);
2240                 return mos7840_get_serial_info(mos7840_port, argp);
2241
2242         case TIOCSSERIAL:
2243                 dbg("%s (%d) TIOCSSERIAL", __func__, port->number);
2244                 break;
2245
2246         case TIOCMIWAIT:
2247                 dbg("%s (%d) TIOCMIWAIT", __func__, port->number);
2248                 cprev = mos7840_port->icount;
2249                 while (1) {
2250                         /* interruptible_sleep_on(&mos7840_port->delta_msr_wait); */
2251                         mos7840_port->delta_msr_cond = 0;
2252                         wait_event_interruptible(mos7840_port->delta_msr_wait,
2253                                                  (mos7840_port->
2254                                                   delta_msr_cond == 1));
2255
2256                         /* see if a signal did it */
2257                         if (signal_pending(current))
2258                                 return -ERESTARTSYS;
2259                         cnow = mos7840_port->icount;
2260                         smp_rmb();
2261                         if (cnow.rng == cprev.rng && cnow.dsr == cprev.dsr &&
2262                             cnow.dcd == cprev.dcd && cnow.cts == cprev.cts)
2263                                 return -EIO;    /* no change => error */
2264                         if (((arg & TIOCM_RNG) && (cnow.rng != cprev.rng)) ||
2265                             ((arg & TIOCM_DSR) && (cnow.dsr != cprev.dsr)) ||
2266                             ((arg & TIOCM_CD) && (cnow.dcd != cprev.dcd)) ||
2267                             ((arg & TIOCM_CTS) && (cnow.cts != cprev.cts))) {
2268                                 return 0;
2269                         }
2270                         cprev = cnow;
2271                 }
2272                 /* NOTREACHED */
2273                 break;
2274
2275         case TIOCGICOUNT:
2276                 cnow = mos7840_port->icount;
2277                 smp_rmb();
2278                 icount.cts = cnow.cts;
2279                 icount.dsr = cnow.dsr;
2280                 icount.rng = cnow.rng;
2281                 icount.dcd = cnow.dcd;
2282                 icount.rx = cnow.rx;
2283                 icount.tx = cnow.tx;
2284                 icount.frame = cnow.frame;
2285                 icount.overrun = cnow.overrun;
2286                 icount.parity = cnow.parity;
2287                 icount.brk = cnow.brk;
2288                 icount.buf_overrun = cnow.buf_overrun;
2289
2290                 dbg("%s (%d) TIOCGICOUNT RX=%d, TX=%d", __func__,
2291                     port->number, icount.rx, icount.tx);
2292                 if (copy_to_user(argp, &icount, sizeof(icount)))
2293                         return -EFAULT;
2294                 return 0;
2295         default:
2296                 break;
2297         }
2298         return -ENOIOCTLCMD;
2299 }
2300
2301 static int mos7840_calc_num_ports(struct usb_serial *serial)
2302 {
2303         int mos7840_num_ports = 0;
2304
2305         dbg("numberofendpoints: cur %d, alt %d",
2306             (int)serial->interface->cur_altsetting->desc.bNumEndpoints,
2307             (int)serial->interface->altsetting->desc.bNumEndpoints);
2308         if (serial->interface->cur_altsetting->desc.bNumEndpoints == 5) {
2309                 mos7840_num_ports = serial->num_ports = 2;
2310         } else if (serial->interface->cur_altsetting->desc.bNumEndpoints == 9) {
2311                 serial->num_bulk_in = 4;
2312                 serial->num_bulk_out = 4;
2313                 mos7840_num_ports = serial->num_ports = 4;
2314         }
2315         dbg ("mos7840_num_ports = %d", mos7840_num_ports);
2316         return mos7840_num_ports;
2317 }
2318
2319 /****************************************************************************
2320  * mos7840_startup
2321  ****************************************************************************/
2322
2323 static int mos7840_startup(struct usb_serial *serial)
2324 {
2325         struct moschip_port *mos7840_port;
2326         struct usb_device *dev;
2327         int i, status;
2328
2329         __u16 Data;
2330         dbg("%s", "mos7840_startup :Entering..........");
2331
2332         if (!serial) {
2333                 dbg("%s", "Invalid Handler");
2334                 return -1;
2335         }
2336
2337         dev = serial->dev;
2338
2339         dbg("%s", "Entering...");
2340         dbg ("mos7840_startup: serial = %p", serial);
2341
2342         /* we set up the pointers to the endpoints in the mos7840_open *
2343          * function, as the structures aren't created yet.             */
2344
2345         /* set up port private structures */
2346         for (i = 0; i < serial->num_ports; ++i) {
2347                 dbg ("mos7840_startup: configuring port %d............", i);
2348                 mos7840_port = kzalloc(sizeof(struct moschip_port), GFP_KERNEL);
2349                 if (mos7840_port == NULL) {
2350                         dev_err(&dev->dev, "%s - Out of memory\n", __func__);
2351                         status = -ENOMEM;
2352                         i--; /* don't follow NULL pointer cleaning up */
2353                         goto error;
2354                 }
2355
2356                 /* Initialize all port interrupt end point to port 0 int
2357                  * endpoint. Our device has only one interrupt end point
2358                  * common to all port */
2359
2360                 mos7840_port->port = serial->port[i];
2361                 mos7840_set_port_private(serial->port[i], mos7840_port);
2362                 spin_lock_init(&mos7840_port->pool_lock);
2363
2364                 /* minor is not initialised until later by
2365                  * usb-serial.c:get_free_serial() and cannot therefore be used
2366                  * to index device instances */
2367                 mos7840_port->port_num = i + 1;
2368                 dbg ("serial->port[i]->number = %d", serial->port[i]->number);
2369                 dbg ("serial->port[i]->serial->minor = %d", serial->port[i]->serial->minor);
2370                 dbg ("mos7840_port->port_num = %d", mos7840_port->port_num);
2371                 dbg ("serial->minor = %d", serial->minor);
2372
2373                 if (mos7840_port->port_num == 1) {
2374                         mos7840_port->SpRegOffset = 0x0;
2375                         mos7840_port->ControlRegOffset = 0x1;
2376                         mos7840_port->DcrRegOffset = 0x4;
2377                 } else if ((mos7840_port->port_num == 2)
2378                            && (serial->num_ports == 4)) {
2379                         mos7840_port->SpRegOffset = 0x8;
2380                         mos7840_port->ControlRegOffset = 0x9;
2381                         mos7840_port->DcrRegOffset = 0x16;
2382                 } else if ((mos7840_port->port_num == 2)
2383                            && (serial->num_ports == 2)) {
2384                         mos7840_port->SpRegOffset = 0xa;
2385                         mos7840_port->ControlRegOffset = 0xb;
2386                         mos7840_port->DcrRegOffset = 0x19;
2387                 } else if ((mos7840_port->port_num == 3)
2388                            && (serial->num_ports == 4)) {
2389                         mos7840_port->SpRegOffset = 0xa;
2390                         mos7840_port->ControlRegOffset = 0xb;
2391                         mos7840_port->DcrRegOffset = 0x19;
2392                 } else if ((mos7840_port->port_num == 4)
2393                            && (serial->num_ports == 4)) {
2394                         mos7840_port->SpRegOffset = 0xc;
2395                         mos7840_port->ControlRegOffset = 0xd;
2396                         mos7840_port->DcrRegOffset = 0x1c;
2397                 }
2398                 mos7840_dump_serial_port(mos7840_port);
2399                 mos7840_set_port_private(serial->port[i], mos7840_port);
2400
2401                 /* enable rx_disable bit in control register */
2402                 status = mos7840_get_reg_sync(serial->port[i],
2403                                  mos7840_port->ControlRegOffset, &Data);
2404                 if (status < 0) {
2405                         dbg("Reading ControlReg failed status-0x%x", status);
2406                         break;
2407                 } else
2408                         dbg("ControlReg Reading success val is %x, status%d",
2409                             Data, status);
2410                 Data |= 0x08;   /* setting driver done bit */
2411                 Data |= 0x04;   /* sp1_bit to have cts change reflect in
2412                                    modem status reg */
2413
2414                 /* Data |= 0x20; //rx_disable bit */
2415                 status = mos7840_set_reg_sync(serial->port[i],
2416                                          mos7840_port->ControlRegOffset, Data);
2417                 if (status < 0) {
2418                         dbg("Writing ControlReg failed(rx_disable) status-0x%x", status);
2419                         break;
2420                 } else
2421                         dbg("ControlReg Writing success(rx_disable) status%d",
2422                             status);
2423
2424                 /* Write default values in DCR (i.e 0x01 in DCR0, 0x05 in DCR2
2425                    and 0x24 in DCR3 */
2426                 Data = 0x01;
2427                 status = mos7840_set_reg_sync(serial->port[i],
2428                          (__u16) (mos7840_port->DcrRegOffset + 0), Data);
2429                 if (status < 0) {
2430                         dbg("Writing DCR0 failed status-0x%x", status);
2431                         break;
2432                 } else
2433                         dbg("DCR0 Writing success status%d", status);
2434
2435                 Data = 0x05;
2436                 status = mos7840_set_reg_sync(serial->port[i],
2437                          (__u16) (mos7840_port->DcrRegOffset + 1), Data);
2438                 if (status < 0) {
2439                         dbg("Writing DCR1 failed status-0x%x", status);
2440                         break;
2441                 } else
2442                         dbg("DCR1 Writing success status%d", status);
2443
2444                 Data = 0x24;
2445                 status = mos7840_set_reg_sync(serial->port[i],
2446                          (__u16) (mos7840_port->DcrRegOffset + 2), Data);
2447                 if (status < 0) {
2448                         dbg("Writing DCR2 failed status-0x%x", status);
2449                         break;
2450                 } else
2451                         dbg("DCR2 Writing success status%d", status);
2452
2453                 /* write values in clkstart0x0 and clkmulti 0x20 */
2454                 Data = 0x0;
2455                 status = mos7840_set_reg_sync(serial->port[i],
2456                                          CLK_START_VALUE_REGISTER, Data);
2457                 if (status < 0) {
2458                         dbg("Writing CLK_START_VALUE_REGISTER failed status-0x%x", status);
2459                         break;
2460                 } else
2461                         dbg("CLK_START_VALUE_REGISTER Writing success status%d", status);
2462
2463                 Data = 0x20;
2464                 status = mos7840_set_reg_sync(serial->port[i],
2465                                         CLK_MULTI_REGISTER, Data);
2466                 if (status < 0) {
2467                         dbg("Writing CLK_MULTI_REGISTER failed status-0x%x",
2468                             status);
2469                         goto error;
2470                 } else
2471                         dbg("CLK_MULTI_REGISTER Writing success status%d",
2472                             status);
2473
2474                 /* write value 0x0 to scratchpad register */
2475                 Data = 0x00;
2476                 status = mos7840_set_uart_reg(serial->port[i],
2477                                                 SCRATCH_PAD_REGISTER, Data);
2478                 if (status < 0) {
2479                         dbg("Writing SCRATCH_PAD_REGISTER failed status-0x%x",
2480                             status);
2481                         break;
2482                 } else
2483                         dbg("SCRATCH_PAD_REGISTER Writing success status%d",
2484                             status);
2485
2486                 /* Zero Length flag register */
2487                 if ((mos7840_port->port_num != 1)
2488                     && (serial->num_ports == 2)) {
2489
2490                         Data = 0xff;
2491                         status = mos7840_set_reg_sync(serial->port[i],
2492                                       (__u16) (ZLP_REG1 +
2493                                       ((__u16)mos7840_port->port_num)), Data);
2494                         dbg("ZLIP offset %x",
2495                             (__u16) (ZLP_REG1 +
2496                                         ((__u16) mos7840_port->port_num)));
2497                         if (status < 0) {
2498                                 dbg("Writing ZLP_REG%d failed status-0x%x",
2499                                     i + 2, status);
2500                                 break;
2501                         } else
2502                                 dbg("ZLP_REG%d Writing success status%d",
2503                                     i + 2, status);
2504                 } else {
2505                         Data = 0xff;
2506                         status = mos7840_set_reg_sync(serial->port[i],
2507                               (__u16) (ZLP_REG1 +
2508                               ((__u16)mos7840_port->port_num) - 0x1), Data);
2509                         dbg("ZLIP offset %x",
2510                             (__u16) (ZLP_REG1 +
2511                                      ((__u16) mos7840_port->port_num) - 0x1));
2512                         if (status < 0) {
2513                                 dbg("Writing ZLP_REG%d failed status-0x%x",
2514                                     i + 1, status);
2515                                 break;
2516                         } else
2517                                 dbg("ZLP_REG%d Writing success status%d",
2518                                     i + 1, status);
2519
2520                 }
2521                 mos7840_port->control_urb = usb_alloc_urb(0, GFP_KERNEL);
2522                 mos7840_port->ctrl_buf = kmalloc(16, GFP_KERNEL);
2523                 mos7840_port->dr = kmalloc(sizeof(struct usb_ctrlrequest),
2524                                                                 GFP_KERNEL);
2525                 if (!mos7840_port->control_urb || !mos7840_port->ctrl_buf ||
2526                                                         !mos7840_port->dr) {
2527                         status = -ENOMEM;
2528                         goto error;
2529                 }
2530         }
2531         dbg ("mos7840_startup: all ports configured...........");
2532
2533         /* Zero Length flag enable */
2534         Data = 0x0f;
2535         status = mos7840_set_reg_sync(serial->port[0], ZLP_REG5, Data);
2536         if (status < 0) {
2537                 dbg("Writing ZLP_REG5 failed status-0x%x", status);
2538                 goto error;
2539         } else
2540                 dbg("ZLP_REG5 Writing success status%d", status);
2541
2542         /* setting configuration feature to one */
2543         usb_control_msg(serial->dev, usb_sndctrlpipe(serial->dev, 0),
2544                         (__u8) 0x03, 0x00, 0x01, 0x00, NULL, 0x00, 5 * HZ);
2545         return 0;
2546 error:
2547         for (/* nothing */; i >= 0; i--) {
2548                 mos7840_port = mos7840_get_port_private(serial->port[i]);
2549
2550                 kfree(mos7840_port->dr);
2551                 kfree(mos7840_port->ctrl_buf);
2552                 usb_free_urb(mos7840_port->control_urb);
2553                 kfree(mos7840_port);
2554                 serial->port[i] = NULL;
2555         }
2556         return status;
2557 }
2558
2559 /****************************************************************************
2560  * mos7840_disconnect
2561  *      This function is called whenever the device is removed from the usb bus.
2562  ****************************************************************************/
2563
2564 static void mos7840_disconnect(struct usb_serial *serial)
2565 {
2566         int i;
2567         unsigned long flags;
2568         struct moschip_port *mos7840_port;
2569         dbg("%s", " disconnect :entering..........");
2570
2571         if (!serial) {
2572                 dbg("%s", "Invalid Handler");
2573                 return;
2574         }
2575
2576         /* check for the ports to be closed,close the ports and disconnect */
2577
2578         /* free private structure allocated for serial port  *
2579          * stop reads and writes on all ports                */
2580
2581         for (i = 0; i < serial->num_ports; ++i) {
2582                 mos7840_port = mos7840_get_port_private(serial->port[i]);
2583                 dbg ("mos7840_port %d = %p", i, mos7840_port);
2584                 if (mos7840_port) {
2585                         spin_lock_irqsave(&mos7840_port->pool_lock, flags);
2586                         mos7840_port->zombie = 1;
2587                         spin_unlock_irqrestore(&mos7840_port->pool_lock, flags);
2588                         usb_kill_urb(mos7840_port->control_urb);
2589                 }
2590         }
2591
2592         dbg("%s", "Thank u :: ");
2593
2594 }
2595
2596 /****************************************************************************
2597  * mos7840_release
2598  *      This function is called when the usb_serial structure is freed.
2599  ****************************************************************************/
2600
2601 static void mos7840_release(struct usb_serial *serial)
2602 {
2603         int i;
2604         struct moschip_port *mos7840_port;
2605         dbg("%s", " release :entering..........");
2606
2607         if (!serial) {
2608                 dbg("%s", "Invalid Handler");
2609                 return;
2610         }
2611
2612         /* check for the ports to be closed,close the ports and disconnect */
2613
2614         /* free private structure allocated for serial port  *
2615          * stop reads and writes on all ports                */
2616
2617         for (i = 0; i < serial->num_ports; ++i) {
2618                 mos7840_port = mos7840_get_port_private(serial->port[i]);
2619                 dbg("mos7840_port %d = %p", i, mos7840_port);
2620                 if (mos7840_port) {
2621                         kfree(mos7840_port->ctrl_buf);
2622                         kfree(mos7840_port->dr);
2623                         kfree(mos7840_port);
2624                 }
2625         }
2626
2627         dbg("%s", "Thank u :: ");
2628
2629 }
2630
2631 static struct usb_driver io_driver = {
2632         .name = "mos7840",
2633         .probe = usb_serial_probe,
2634         .disconnect = usb_serial_disconnect,
2635         .id_table = moschip_id_table_combined,
2636         .no_dynamic_id = 1,
2637 };
2638
2639 static struct usb_serial_driver moschip7840_4port_device = {
2640         .driver = {
2641                    .owner = THIS_MODULE,
2642                    .name = "mos7840",
2643                    },
2644         .description = DRIVER_DESC,
2645         .usb_driver = &io_driver,
2646         .id_table = moschip_port_id_table,
2647         .num_ports = 4,
2648         .open = mos7840_open,
2649         .close = mos7840_close,
2650         .write = mos7840_write,
2651         .write_room = mos7840_write_room,
2652         .chars_in_buffer = mos7840_chars_in_buffer,
2653         .throttle = mos7840_throttle,
2654         .unthrottle = mos7840_unthrottle,
2655         .calc_num_ports = mos7840_calc_num_ports,
2656 #ifdef MCSSerialProbe
2657         .probe = mos7840_serial_probe,
2658 #endif
2659         .ioctl = mos7840_ioctl,
2660         .set_termios = mos7840_set_termios,
2661         .break_ctl = mos7840_break,
2662         .tiocmget = mos7840_tiocmget,
2663         .tiocmset = mos7840_tiocmset,
2664         .attach = mos7840_startup,
2665         .disconnect = mos7840_disconnect,
2666         .release = mos7840_release,
2667         .read_bulk_callback = mos7840_bulk_in_callback,
2668         .read_int_callback = mos7840_interrupt_callback,
2669 };
2670
2671 /****************************************************************************
2672  * moschip7840_init
2673  *      This is called by the module subsystem, or on startup to initialize us
2674  ****************************************************************************/
2675 static int __init moschip7840_init(void)
2676 {
2677         int retval;
2678
2679         dbg("%s", " mos7840_init :entering..........");
2680
2681         /* Register with the usb serial */
2682         retval = usb_serial_register(&moschip7840_4port_device);
2683
2684         if (retval)
2685                 goto failed_port_device_register;
2686
2687         dbg("%s", "Entering...");
2688         printk(KERN_INFO KBUILD_MODNAME ": " DRIVER_VERSION ":"
2689                DRIVER_DESC "\n");
2690
2691         /* Register with the usb */
2692         retval = usb_register(&io_driver);
2693         if (retval == 0) {
2694                 dbg("%s", "Leaving...");
2695                 return 0;
2696         }
2697         usb_serial_deregister(&moschip7840_4port_device);
2698 failed_port_device_register:
2699         return retval;
2700 }
2701
2702 /****************************************************************************
2703  * moschip7840_exit
2704  *      Called when the driver is about to be unloaded.
2705  ****************************************************************************/
2706 static void __exit moschip7840_exit(void)
2707 {
2708
2709         dbg("%s", " mos7840_exit :entering..........");
2710
2711         usb_deregister(&io_driver);
2712
2713         usb_serial_deregister(&moschip7840_4port_device);
2714
2715         dbg("%s", "Entering...");
2716 }
2717
2718 module_init(moschip7840_init);
2719 module_exit(moschip7840_exit);
2720
2721 /* Module information */
2722 MODULE_DESCRIPTION(DRIVER_DESC);
2723 MODULE_LICENSE("GPL");
2724
2725 module_param(debug, bool, S_IRUGO | S_IWUSR);
2726 MODULE_PARM_DESC(debug, "Debug enabled or not");