SAFE public projects git trees. - safe/jmp/linux-2.6/blob - drivers/usb/serial/ti_usb_3410_5052.c

   1 /* vi: ts=8 sw=8
   2  *
   3  * TI 3410/5052 USB Serial Driver
   4  *
   5  * Copyright (C) 2004 Texas Instruments
   6  *
   7  * This driver is based on the Linux io_ti driver, which is
   8  *   Copyright (C) 2000-2002 Inside Out Networks
   9  *   Copyright (C) 2001-2002 Greg Kroah-Hartman
  10  *
  11  * This program is free software; you can redistribute it and/or modify
  12  * it under the terms of the GNU General Public License as published by
  13  * the Free Software Foundation; either version 2 of the License, or
  14  * (at your option) any later version.
  15  *
  16  * For questions or problems with this driver, contact Texas Instruments
  17  * technical support, or Al Borchers <alborchers@steinerpoint.com>, or
  18  * Peter Berger <pberger@brimson.com>.
  19  *
  20  * This driver needs this hotplug script in /etc/hotplug/usb/ti_usb_3410_5052
  21  * or in /etc/hotplug.d/usb/ti_usb_3410_5052.hotplug to set the device
  22  * configuration.
  23  *
  24  * #!/bin/bash
  25  *
  26  * BOOT_CONFIG=1
  27  * ACTIVE_CONFIG=2
  28  *
  29  * if [[ "$ACTION" != "add" ]]
  30  * then
  31  *      exit
  32  * fi
  33  *
  34  * CONFIG_PATH=/sys${DEVPATH%/?*}/bConfigurationValue
  35  *
  36  * if [[ 0`cat $CONFIG_PATH` -ne $BOOT_CONFIG ]]
  37  * then
  38  *      exit
  39  * fi
  40  *
  41  * PRODUCT=${PRODUCT%/?*}               # delete version
  42  * VENDOR_ID=`printf "%d" 0x${PRODUCT%/?*}`
  43  * PRODUCT_ID=`printf "%d" 0x${PRODUCT#*?/}`
  44  *
  45  * PARAM_PATH=/sys/module/ti_usb_3410_5052/parameters
  46  *
  47  * function scan() {
  48  *      s=$1
  49  *      shift
  50  *      for i
  51  *      do
  52  *              if [[ $s -eq $i ]]
  53  *              then
  54  *                      return 0
  55  *              fi
  56  *      done
  57  *      return 1
  58  * }
  59  *
  60  * IFS=$IFS,
  61  *
  62  * if (scan $VENDOR_ID 1105 `cat $PARAM_PATH/vendor_3410` &&
  63  * scan $PRODUCT_ID 13328 `cat $PARAM_PATH/product_3410`) ||
  64  * (scan $VENDOR_ID 1105 `cat $PARAM_PATH/vendor_5052` &&
  65  * scan $PRODUCT_ID 20562 20818 20570 20575 `cat $PARAM_PATH/product_5052`)
  66  * then
  67  *      echo $ACTIVE_CONFIG > $CONFIG_PATH
  68  * fi
  69  */
  70
  71 #include <linux/kernel.h>
  72 #include <linux/errno.h>
  73 #include <linux/init.h>
  74 #include <linux/slab.h>
  75 #include <linux/tty.h>
  76 #include <linux/tty_driver.h>
  77 #include <linux/tty_flip.h>
  78 #include <linux/module.h>
  79 #include <linux/spinlock.h>
  80 #include <linux/ioctl.h>
  81 #include <linux/serial.h>
  82 #include <linux/circ_buf.h>
  83 #include <linux/mutex.h>
  84 #include <asm/uaccess.h>
  85 #include <linux/usb.h>
  86 #include <linux/usb/serial.h>
  87
  88 #include "ti_usb_3410_5052.h"
  89 #include "ti_fw_3410.h"         /* firmware image for 3410 */
  90 #include "ti_fw_5052.h"         /* firmware image for 5052 */
  91
  92
  93 /* Defines */
  94
  95 #define TI_DRIVER_VERSION       "v0.9"
  96 #define TI_DRIVER_AUTHOR        "Al Borchers <alborchers@steinerpoint.com>"
  97 #define TI_DRIVER_DESC          "TI USB 3410/5052 Serial Driver"
  98
  99 #define TI_FIRMWARE_BUF_SIZE    16284
 100
 101 #define TI_WRITE_BUF_SIZE       1024
 102
 103 #define TI_TRANSFER_TIMEOUT     2
 104
 105 #define TI_DEFAULT_LOW_LATENCY  0
 106 #define TI_DEFAULT_CLOSING_WAIT 4000            /* in .01 secs */
 107
 108 /* supported setserial flags */
 109 #define TI_SET_SERIAL_FLAGS     (ASYNC_LOW_LATENCY)
 110
 111 /* read urb states */
 112 #define TI_READ_URB_RUNNING     0
 113 #define TI_READ_URB_STOPPING    1
 114 #define TI_READ_URB_STOPPED     2
 115
 116 #define TI_EXTRA_VID_PID_COUNT  5
 117
 118
 119 /* Structures */
 120
 121 struct ti_port {
 122         int                     tp_is_open;
 123         __u8                    tp_msr;
 124         __u8                    tp_lsr;
 125         __u8                    tp_shadow_mcr;
 126         __u8                    tp_uart_mode;   /* 232 or 485 modes */
 127         unsigned int            tp_uart_base_addr;
 128         int                     tp_flags;
 129         int                     tp_closing_wait;/* in .01 secs */
 130         struct async_icount     tp_icount;
 131         wait_queue_head_t       tp_msr_wait;    /* wait for msr change */
 132         wait_queue_head_t       tp_write_wait;
 133         struct ti_device        *tp_tdev;
 134         struct usb_serial_port  *tp_port;
 135         spinlock_t              tp_lock;
 136         int                     tp_read_urb_state;
 137         int                     tp_write_urb_in_use;
 138         struct circ_buf         *tp_write_buf;
 139 };
 140
 141 struct ti_device {
 142         struct mutex            td_open_close_lock;
 143         int                     td_open_port_count;
 144         struct usb_serial       *td_serial;
 145         int                     td_is_3410;
 146         int                     td_urb_error;
 147 };
 148
 149
 150 /* Function Declarations */
 151
 152 static int ti_startup(struct usb_serial *serial);
 153 static void ti_shutdown(struct usb_serial *serial);
 154 static int ti_open(struct usb_serial_port *port, struct file *file);
 155 static void ti_close(struct usb_serial_port *port, struct file *file);
 156 static int ti_write(struct usb_serial_port *port, const unsigned char *data,
 157         int count);
 158 static int ti_write_room(struct usb_serial_port *port);
 159 static int ti_chars_in_buffer(struct usb_serial_port *port);
 160 static void ti_throttle(struct usb_serial_port *port);
 161 static void ti_unthrottle(struct usb_serial_port *port);
 162 static int ti_ioctl(struct usb_serial_port *port, struct file *file, unsigned int cmd, unsigned long arg);
 163 static void ti_set_termios(struct usb_serial_port *port,
 164         struct ktermios *old_termios);
 165 static int ti_tiocmget(struct usb_serial_port *port, struct file *file);
 166 static int ti_tiocmset(struct usb_serial_port *port, struct file *file,
 167         unsigned int set, unsigned int clear);
 168 static void ti_break(struct usb_serial_port *port, int break_state);
 169 static void ti_interrupt_callback(struct urb *urb);
 170 static void ti_bulk_in_callback(struct urb *urb);
 171 static void ti_bulk_out_callback(struct urb *urb);
 172
 173 static void ti_recv(struct device *dev, struct tty_struct *tty,
 174         unsigned char *data, int length);
 175 static void ti_send(struct ti_port *tport);
 176 static int ti_set_mcr(struct ti_port *tport, unsigned int mcr);
 177 static int ti_get_lsr(struct ti_port *tport);
 178 static int ti_get_serial_info(struct ti_port *tport,
 179         struct serial_struct __user *ret_arg);
 180 static int ti_set_serial_info(struct ti_port *tport,
 181         struct serial_struct __user *new_arg);
 182 static void ti_handle_new_msr(struct ti_port *tport, __u8 msr);
 183
 184 static void ti_drain(struct ti_port *tport, unsigned long timeout, int flush);
 185
 186 static void ti_stop_read(struct ti_port *tport, struct tty_struct *tty);
 187 static int ti_restart_read(struct ti_port *tport, struct tty_struct *tty);
 188
 189 static int ti_command_out_sync(struct ti_device *tdev, __u8 command,
 190         __u16 moduleid, __u16 value, __u8 *data, int size);
 191 static int ti_command_in_sync(struct ti_device *tdev, __u8 command,
 192         __u16 moduleid, __u16 value, __u8 *data, int size);
 193
 194 static int ti_write_byte(struct ti_device *tdev, unsigned long addr,
 195         __u8 mask, __u8 byte);
 196
 197 static int ti_download_firmware(struct ti_device *tdev,
 198         unsigned char *firmware, unsigned int firmware_size);
 199
 200 /* circular buffer */
 201 static struct circ_buf *ti_buf_alloc(void);
 202 static void ti_buf_free(struct circ_buf *cb);
 203 static void ti_buf_clear(struct circ_buf *cb);
 204 static int ti_buf_data_avail(struct circ_buf *cb);
 205 static int ti_buf_space_avail(struct circ_buf *cb);
 206 static int ti_buf_put(struct circ_buf *cb, const char *buf, int count);
 207 static int ti_buf_get(struct circ_buf *cb, char *buf, int count);
 208
 209
 210 /* Data */
 211
 212 /* module parameters */
 213 static int debug;
 214 static int low_latency = TI_DEFAULT_LOW_LATENCY;
 215 static int closing_wait = TI_DEFAULT_CLOSING_WAIT;
 216 static ushort vendor_3410[TI_EXTRA_VID_PID_COUNT];
 217 static unsigned int vendor_3410_count;
 218 static ushort product_3410[TI_EXTRA_VID_PID_COUNT];
 219 static unsigned int product_3410_count;
 220 static ushort vendor_5052[TI_EXTRA_VID_PID_COUNT];
 221 static unsigned int vendor_5052_count;
 222 static ushort product_5052[TI_EXTRA_VID_PID_COUNT];
 223 static unsigned int product_5052_count;
 224
 225 /* supported devices */
 226 /* the array dimension is the number of default entries plus */
 227 /* TI_EXTRA_VID_PID_COUNT user defined entries plus 1 terminating */
 228 /* null entry */
 229 static struct usb_device_id ti_id_table_3410[1+TI_EXTRA_VID_PID_COUNT+1] = {
 230         { USB_DEVICE(TI_VENDOR_ID, TI_3410_PRODUCT_ID) },
 231         { USB_DEVICE(TI_VENDOR_ID, TI_3410_EZ430_ID) },
 232 };
 233
 234 static struct usb_device_id ti_id_table_5052[4+TI_EXTRA_VID_PID_COUNT+1] = {
 235         { USB_DEVICE(TI_VENDOR_ID, TI_5052_BOOT_PRODUCT_ID) },
 236         { USB_DEVICE(TI_VENDOR_ID, TI_5152_BOOT_PRODUCT_ID) },
 237         { USB_DEVICE(TI_VENDOR_ID, TI_5052_EEPROM_PRODUCT_ID) },
 238         { USB_DEVICE(TI_VENDOR_ID, TI_5052_FIRMWARE_PRODUCT_ID) },
 239 };
 240
 241 static struct usb_device_id ti_id_table_combined[] = {
 242         { USB_DEVICE(TI_VENDOR_ID, TI_3410_PRODUCT_ID) },
 243         { USB_DEVICE(TI_VENDOR_ID, TI_3410_EZ430_ID) },
 244         { USB_DEVICE(TI_VENDOR_ID, TI_5052_BOOT_PRODUCT_ID) },
 245         { USB_DEVICE(TI_VENDOR_ID, TI_5152_BOOT_PRODUCT_ID) },
 246         { USB_DEVICE(TI_VENDOR_ID, TI_5052_EEPROM_PRODUCT_ID) },
 247         { USB_DEVICE(TI_VENDOR_ID, TI_5052_FIRMWARE_PRODUCT_ID) },
 248         { }
 249 };
 250
 251 static struct usb_driver ti_usb_driver = {
 252         .name                   = "ti_usb_3410_5052",
 253         .probe                  = usb_serial_probe,
 254         .disconnect             = usb_serial_disconnect,
 255         .id_table               = ti_id_table_combined,
 256         .no_dynamic_id =        1,
 257 };
 258
 259 static struct usb_serial_driver ti_1port_device = {
 260         .driver = {
 261                 .owner          = THIS_MODULE,
 262                 .name           = "ti_usb_3410_5052_1",
 263         },
 264         .description            = "TI USB 3410 1 port adapter",
 265         .usb_driver             = &ti_usb_driver,
 266         .id_table               = ti_id_table_3410,
 267         .num_ports              = 1,
 268         .attach                 = ti_startup,
 269         .shutdown               = ti_shutdown,
 270         .open                   = ti_open,
 271         .close                  = ti_close,
 272         .write                  = ti_write,
 273         .write_room             = ti_write_room,
 274         .chars_in_buffer        = ti_chars_in_buffer,
 275         .throttle               = ti_throttle,
 276         .unthrottle             = ti_unthrottle,
 277         .ioctl                  = ti_ioctl,
 278         .set_termios            = ti_set_termios,
 279         .tiocmget               = ti_tiocmget,
 280         .tiocmset               = ti_tiocmset,
 281         .break_ctl              = ti_break,
 282         .read_int_callback      = ti_interrupt_callback,
 283         .read_bulk_callback     = ti_bulk_in_callback,
 284         .write_bulk_callback    = ti_bulk_out_callback,
 285 };
 286
 287 static struct usb_serial_driver ti_2port_device = {
 288         .driver = {
 289                 .owner          = THIS_MODULE,
 290                 .name           = "ti_usb_3410_5052_2",
 291         },
 292         .description            = "TI USB 5052 2 port adapter",
 293         .usb_driver             = &ti_usb_driver,
 294         .id_table               = ti_id_table_5052,
 295         .num_ports              = 2,
 296         .attach                 = ti_startup,
 297         .shutdown               = ti_shutdown,
 298         .open                   = ti_open,
 299         .close                  = ti_close,
 300         .write                  = ti_write,
 301         .write_room             = ti_write_room,
 302         .chars_in_buffer        = ti_chars_in_buffer,
 303         .throttle               = ti_throttle,
 304         .unthrottle             = ti_unthrottle,
 305         .ioctl                  = ti_ioctl,
 306         .set_termios            = ti_set_termios,
 307         .tiocmget               = ti_tiocmget,
 308         .tiocmset               = ti_tiocmset,
 309         .break_ctl              = ti_break,
 310         .read_int_callback      = ti_interrupt_callback,
 311         .read_bulk_callback     = ti_bulk_in_callback,
 312         .write_bulk_callback    = ti_bulk_out_callback,
 313 };
 314
 315
 316 /* Module */
 317
 318 MODULE_AUTHOR(TI_DRIVER_AUTHOR);
 319 MODULE_DESCRIPTION(TI_DRIVER_DESC);
 320 MODULE_VERSION(TI_DRIVER_VERSION);
 321 MODULE_LICENSE("GPL");
 322
 323 module_param(debug, bool, S_IRUGO | S_IWUSR);
 324 MODULE_PARM_DESC(debug, "Enable debugging, 0=no, 1=yes");
 325
 326 module_param(low_latency, bool, S_IRUGO | S_IWUSR);
 327 MODULE_PARM_DESC(low_latency, "TTY low_latency flag, 0=off, 1=on, default is off");
 328
 329 module_param(closing_wait, int, S_IRUGO | S_IWUSR);
 330 MODULE_PARM_DESC(closing_wait, "Maximum wait for data to drain in close, in .01 secs, default is 4000");
 331
 332 module_param_array(vendor_3410, ushort, &vendor_3410_count, S_IRUGO);
 333 MODULE_PARM_DESC(vendor_3410, "Vendor ids for 3410 based devices, 1-5 short integers");
 334 module_param_array(product_3410, ushort, &product_3410_count, S_IRUGO);
 335 MODULE_PARM_DESC(product_3410, "Product ids for 3410 based devices, 1-5 short integers");
 336 module_param_array(vendor_5052, ushort, &vendor_5052_count, S_IRUGO);
 337 MODULE_PARM_DESC(vendor_5052, "Vendor ids for 5052 based devices, 1-5 short integers");
 338 module_param_array(product_5052, ushort, &product_5052_count, S_IRUGO);
 339 MODULE_PARM_DESC(product_5052, "Product ids for 5052 based devices, 1-5 short integers");
 340
 341 MODULE_DEVICE_TABLE(usb, ti_id_table_combined);
 342
 343
 344 /* Functions */
 345
 346 static int __init ti_init(void)
 347 {
 348         int i,j;
 349         int ret;
 350
 351         /* insert extra vendor and product ids */
 352         j = ARRAY_SIZE(ti_id_table_3410) - TI_EXTRA_VID_PID_COUNT - 1;
 353         for (i=0; i<min(vendor_3410_count,product_3410_count); i++,j++) {
 354                 ti_id_table_3410[j].idVendor = vendor_3410[i];
 355                 ti_id_table_3410[j].idProduct = product_3410[i];
 356                 ti_id_table_3410[j].match_flags = USB_DEVICE_ID_MATCH_DEVICE;
 357         }
 358         j = ARRAY_SIZE(ti_id_table_5052) - TI_EXTRA_VID_PID_COUNT - 1;
 359         for (i=0; i<min(vendor_5052_count,product_5052_count); i++,j++) {
 360                 ti_id_table_5052[j].idVendor = vendor_5052[i];
 361                 ti_id_table_5052[j].idProduct = product_5052[i];
 362                 ti_id_table_5052[j].match_flags = USB_DEVICE_ID_MATCH_DEVICE;
 363         }
 364
 365         ret = usb_serial_register(&ti_1port_device);
 366         if (ret)
 367                 goto failed_1port;
 368         ret = usb_serial_register(&ti_2port_device);
 369         if (ret)
 370                 goto failed_2port;
 371
 372         ret = usb_register(&ti_usb_driver);
 373         if (ret)
 374                 goto failed_usb;
 375
 376         info(TI_DRIVER_DESC " " TI_DRIVER_VERSION);
 377
 378         return 0;
 379
 380 failed_usb:
 381         usb_serial_deregister(&ti_2port_device);
 382 failed_2port:
 383         usb_serial_deregister(&ti_1port_device);
 384 failed_1port:
 385         return ret;
 386 }
 387
 388
 389 static void __exit ti_exit(void)
 390 {
 391         usb_serial_deregister(&ti_1port_device);
 392         usb_serial_deregister(&ti_2port_device);
 393         usb_deregister(&ti_usb_driver);
 394 }
 395
 396
 397 module_init(ti_init);
 398 module_exit(ti_exit);
 399
 400
 401 static int ti_startup(struct usb_serial *serial)
 402 {
 403         struct ti_device *tdev;
 404         struct ti_port *tport;
 405         struct usb_device *dev = serial->dev;
 406         int status;
 407         int i;
 408
 409
 410         dbg("%s - product 0x%4X, num configurations %d, configuration value %d",
 411             __func__, le16_to_cpu(dev->descriptor.idProduct),
 412             dev->descriptor.bNumConfigurations,
 413             dev->actconfig->desc.bConfigurationValue);
 414
 415         /* create device structure */
 416         tdev = kzalloc(sizeof(struct ti_device), GFP_KERNEL);
 417         if (tdev == NULL) {
 418                 dev_err(&dev->dev, "%s - out of memory\n", __func__);
 419                 return -ENOMEM;
 420         }
 421         mutex_init(&tdev->td_open_close_lock);
 422         tdev->td_serial = serial;
 423         usb_set_serial_data(serial, tdev);
 424
 425         /* determine device type */
 426         if (usb_match_id(serial->interface, ti_id_table_3410))
 427                 tdev->td_is_3410 = 1;
 428         dbg("%s - device type is %s", __func__, tdev->td_is_3410 ? "3410" : "5052");
 429
 430         /* if we have only 1 configuration, download firmware */
 431         if (dev->descriptor.bNumConfigurations == 1) {
 432
 433                 if (tdev->td_is_3410)
 434                         status = ti_download_firmware(tdev, ti_fw_3410,
 435                                 sizeof(ti_fw_3410));
 436                 else
 437                         status = ti_download_firmware(tdev, ti_fw_5052,
 438                                 sizeof(ti_fw_5052));
 439                 if (status)
 440                         goto free_tdev;
 441
 442                 /* 3410 must be reset, 5052 resets itself */
 443                 if (tdev->td_is_3410) {
 444                         msleep_interruptible(100);
 445                         usb_reset_device(dev);
 446                 }
 447
 448                 status = -ENODEV;
 449                 goto free_tdev;
 450         }
 451
 452         /* the second configuration must be set (in sysfs by hotplug script) */
 453         if (dev->actconfig->desc.bConfigurationValue == TI_BOOT_CONFIG) {
 454                 status = -ENODEV;
 455                 goto free_tdev;
 456         }
 457
 458         /* set up port structures */
 459         for (i = 0; i < serial->num_ports; ++i) {
 460                 tport = kzalloc(sizeof(struct ti_port), GFP_KERNEL);
 461                 if (tport == NULL) {
 462                         dev_err(&dev->dev, "%s - out of memory\n", __func__);
 463                         status = -ENOMEM;
 464                         goto free_tports;
 465                 }
 466                 spin_lock_init(&tport->tp_lock);
 467                 tport->tp_uart_base_addr = (i == 0 ? TI_UART1_BASE_ADDR : TI_UART2_BASE_ADDR);
 468                 tport->tp_flags = low_latency ? ASYNC_LOW_LATENCY : 0;
 469                 tport->tp_closing_wait = closing_wait;
 470                 init_waitqueue_head(&tport->tp_msr_wait);
 471                 init_waitqueue_head(&tport->tp_write_wait);
 472                 tport->tp_write_buf = ti_buf_alloc();
 473                 if (tport->tp_write_buf == NULL) {
 474                         dev_err(&dev->dev, "%s - out of memory\n", __func__);
 475                         kfree(tport);
 476                         status = -ENOMEM;
 477                         goto free_tports;
 478                 }
 479                 tport->tp_port = serial->port[i];
 480                 tport->tp_tdev = tdev;
 481                 usb_set_serial_port_data(serial->port[i], tport);
 482                 tport->tp_uart_mode = 0;        /* default is RS232 */
 483         }
 484
 485         return 0;
 486
 487 free_tports:
 488         for (--i; i>=0; --i) {
 489                 tport = usb_get_serial_port_data(serial->port[i]);
 490                 ti_buf_free(tport->tp_write_buf);
 491                 kfree(tport);
 492                 usb_set_serial_port_data(serial->port[i], NULL);
 493         }
 494 free_tdev:
 495         kfree(tdev);
 496         usb_set_serial_data(serial, NULL);
 497         return status;
 498 }
 499
 500
 501 static void ti_shutdown(struct usb_serial *serial)
 502 {
 503         int i;
 504         struct ti_device *tdev = usb_get_serial_data(serial);
 505         struct ti_port *tport;
 506
 507         dbg("%s", __func__);
 508
 509         for (i=0; i < serial->num_ports; ++i) {
 510                 tport = usb_get_serial_port_data(serial->port[i]);
 511                 if (tport) {
 512                         ti_buf_free(tport->tp_write_buf);
 513                         kfree(tport);
 514                         usb_set_serial_port_data(serial->port[i], NULL);
 515                 }
 516         }
 517
 518         kfree(tdev);
 519         usb_set_serial_data(serial, NULL);
 520 }
 521
 522
 523 static int ti_open(struct usb_serial_port *port, struct file *file)
 524 {
 525         struct ti_port *tport = usb_get_serial_port_data(port);
 526         struct ti_device *tdev;
 527         struct usb_device *dev;
 528         struct urb *urb;
 529         int port_number;
 530         int status;
 531         __u16 open_settings = (__u8)(TI_PIPE_MODE_CONTINOUS |
 532                              TI_PIPE_TIMEOUT_ENABLE |
 533                              (TI_TRANSFER_TIMEOUT << 2));
 534
 535         dbg("%s - port %d", __func__, port->number);
 536
 537         if (tport == NULL)
 538                 return -ENODEV;
 539
 540         dev = port->serial->dev;
 541         tdev = tport->tp_tdev;
 542
 543         /* only one open on any port on a device at a time */
 544         if (mutex_lock_interruptible(&tdev->td_open_close_lock))
 545                 return -ERESTARTSYS;
 546
 547         if (port->tty)
 548                 port->tty->low_latency =
 549                         (tport->tp_flags & ASYNC_LOW_LATENCY) ? 1 : 0;
 550
 551         port_number = port->number - port->serial->minor;
 552
 553         memset(&(tport->tp_icount), 0x00, sizeof(tport->tp_icount));
 554
 555         tport->tp_msr = 0;
 556         tport->tp_shadow_mcr |= (TI_MCR_RTS | TI_MCR_DTR);
 557
 558         /* start interrupt urb the first time a port is opened on this device */
 559         if (tdev->td_open_port_count == 0) {
 560                 dbg("%s - start interrupt in urb", __func__);
 561                 urb = tdev->td_serial->port[0]->interrupt_in_urb;
 562                 if (!urb) {
 563                         dev_err(&port->dev, "%s - no interrupt urb\n", __func__);
 564                         status = -EINVAL;
 565                         goto release_lock;
 566                 }
 567                 urb->complete = ti_interrupt_callback;
 568                 urb->context = tdev;
 569                 urb->dev = dev;
 570                 status = usb_submit_urb(urb, GFP_KERNEL);
 571                 if (status) {
 572                         dev_err(&port->dev, "%s - submit interrupt urb failed, %d\n", __func__, status);
 573                         goto release_lock;
 574                 }
 575         }
 576
 577         ti_set_termios(port, port->tty->termios);
 578
 579         dbg("%s - sending TI_OPEN_PORT", __func__);
 580         status = ti_command_out_sync(tdev, TI_OPEN_PORT,
 581                 (__u8)(TI_UART1_PORT + port_number), open_settings, NULL, 0);
 582         if (status) {
 583                 dev_err(&port->dev, "%s - cannot send open command, %d\n", __func__, status);
 584                 goto unlink_int_urb;
 585         }
 586
 587         dbg("%s - sending TI_START_PORT", __func__);
 588         status = ti_command_out_sync(tdev, TI_START_PORT,
 589                 (__u8)(TI_UART1_PORT + port_number), 0, NULL, 0);
 590         if (status) {
 591                 dev_err(&port->dev, "%s - cannot send start command, %d\n", __func__, status);
 592                 goto unlink_int_urb;
 593         }
 594
 595         dbg("%s - sending TI_PURGE_PORT", __func__);
 596         status = ti_command_out_sync(tdev, TI_PURGE_PORT,
 597                 (__u8)(TI_UART1_PORT + port_number), TI_PURGE_INPUT, NULL, 0);
 598         if (status) {
 599                 dev_err(&port->dev, "%s - cannot clear input buffers, %d\n", __func__, status);
 600                 goto unlink_int_urb;
 601         }
 602         status = ti_command_out_sync(tdev, TI_PURGE_PORT,
 603                 (__u8)(TI_UART1_PORT + port_number), TI_PURGE_OUTPUT, NULL, 0);
 604         if (status) {
 605                 dev_err(&port->dev, "%s - cannot clear output buffers, %d\n", __func__, status);
 606                 goto unlink_int_urb;
 607         }
 608
 609         /* reset the data toggle on the bulk endpoints to work around bug in
 610          * host controllers where things get out of sync some times */
 611         usb_clear_halt(dev, port->write_urb->pipe);
 612         usb_clear_halt(dev, port->read_urb->pipe);
 613
 614         ti_set_termios(port, port->tty->termios);
 615
 616         dbg("%s - sending TI_OPEN_PORT (2)", __func__);
 617         status = ti_command_out_sync(tdev, TI_OPEN_PORT,
 618                 (__u8)(TI_UART1_PORT + port_number), open_settings, NULL, 0);
 619         if (status) {
 620                 dev_err(&port->dev, "%s - cannot send open command (2), %d\n", __func__, status);
 621                 goto unlink_int_urb;
 622         }
 623
 624         dbg("%s - sending TI_START_PORT (2)", __func__);
 625         status = ti_command_out_sync(tdev, TI_START_PORT,
 626                 (__u8)(TI_UART1_PORT + port_number), 0, NULL, 0);
 627         if (status) {
 628                 dev_err(&port->dev, "%s - cannot send start command (2), %d\n", __func__, status);
 629                 goto unlink_int_urb;
 630         }
 631
 632         /* start read urb */
 633         dbg("%s - start read urb", __func__);
 634         urb = port->read_urb;
 635         if (!urb) {
 636                 dev_err(&port->dev, "%s - no read urb\n", __func__);
 637                 status = -EINVAL;
 638                 goto unlink_int_urb;
 639         }
 640         tport->tp_read_urb_state = TI_READ_URB_RUNNING;
 641         urb->complete = ti_bulk_in_callback;
 642         urb->context = tport;
 643         urb->dev = dev;
 644         status = usb_submit_urb(urb, GFP_KERNEL);
 645         if (status) {
 646                 dev_err(&port->dev, "%s - submit read urb failed, %d\n", __func__, status);
 647                 goto unlink_int_urb;
 648         }
 649
 650         tport->tp_is_open = 1;
 651         ++tdev->td_open_port_count;
 652
 653         goto release_lock;
 654
 655 unlink_int_urb:
 656         if (tdev->td_open_port_count == 0)
 657                 usb_kill_urb(port->serial->port[0]->interrupt_in_urb);
 658 release_lock:
 659         mutex_unlock(&tdev->td_open_close_lock);
 660         dbg("%s - exit %d", __func__, status);
 661         return status;
 662 }
 663
 664
 665 static void ti_close(struct usb_serial_port *port, struct file *file)
 666 {
 667         struct ti_device *tdev;
 668         struct ti_port *tport;
 669         int port_number;
 670         int status;
 671         int do_unlock;
 672
 673         dbg("%s - port %d", __func__, port->number);
 674
 675         tdev = usb_get_serial_data(port->serial);
 676         tport = usb_get_serial_port_data(port);
 677         if (tdev == NULL || tport == NULL)
 678                 return;
 679
 680         tport->tp_is_open = 0;
 681
 682         ti_drain(tport, (tport->tp_closing_wait*HZ)/100, 1);
 683
 684         usb_kill_urb(port->read_urb);
 685         usb_kill_urb(port->write_urb);
 686         tport->tp_write_urb_in_use = 0;
 687
 688         port_number = port->number - port->serial->minor;
 689
 690         dbg("%s - sending TI_CLOSE_PORT", __func__);
 691         status = ti_command_out_sync(tdev, TI_CLOSE_PORT,
 692                      (__u8)(TI_UART1_PORT + port_number), 0, NULL, 0);
 693         if (status)
 694                 dev_err(&port->dev, "%s - cannot send close port command, %d\n" , __func__, status);
 695
 696         /* if mutex_lock is interrupted, continue anyway */
 697         do_unlock = !mutex_lock_interruptible(&tdev->td_open_close_lock);
 698         --tport->tp_tdev->td_open_port_count;
 699         if (tport->tp_tdev->td_open_port_count <= 0) {
 700                 /* last port is closed, shut down interrupt urb */
 701                 usb_kill_urb(port->serial->port[0]->interrupt_in_urb);
 702                 tport->tp_tdev->td_open_port_count = 0;
 703         }
 704         if (do_unlock)
 705                 mutex_unlock(&tdev->td_open_close_lock);
 706
 707         dbg("%s - exit", __func__);
 708 }
 709
 710
 711 static int ti_write(struct usb_serial_port *port, const unsigned char *data,
 712         int count)
 713 {
 714         struct ti_port *tport = usb_get_serial_port_data(port);
 715         unsigned long flags;
 716
 717         dbg("%s - port %d", __func__, port->number);
 718
 719         if (count == 0) {
 720                 dbg("%s - write request of 0 bytes", __func__);
 721                 return 0;
 722         }
 723
 724         if (tport == NULL || !tport->tp_is_open)
 725                 return -ENODEV;
 726
 727         spin_lock_irqsave(&tport->tp_lock, flags);
 728         count = ti_buf_put(tport->tp_write_buf, data, count);
 729         spin_unlock_irqrestore(&tport->tp_lock, flags);
 730
 731         ti_send(tport);
 732
 733         return count;
 734 }
 735
 736
 737 static int ti_write_room(struct usb_serial_port *port)
 738 {
 739         struct ti_port *tport = usb_get_serial_port_data(port);
 740         int room = 0;
 741         unsigned long flags;
 742
 743         dbg("%s - port %d", __func__, port->number);
 744
 745         if (tport == NULL)
 746                 return -ENODEV;
 747
 748         spin_lock_irqsave(&tport->tp_lock, flags);
 749         room = ti_buf_space_avail(tport->tp_write_buf);
 750         spin_unlock_irqrestore(&tport->tp_lock, flags);
 751
 752         dbg("%s - returns %d", __func__, room);
 753         return room;
 754 }
 755
 756
 757 static int ti_chars_in_buffer(struct usb_serial_port *port)
 758 {
 759         struct ti_port *tport = usb_get_serial_port_data(port);
 760         int chars = 0;
 761         unsigned long flags;
 762
 763         dbg("%s - port %d", __func__, port->number);
 764
 765         if (tport == NULL)
 766                 return -ENODEV;
 767
 768         spin_lock_irqsave(&tport->tp_lock, flags);
 769         chars = ti_buf_data_avail(tport->tp_write_buf);
 770         spin_unlock_irqrestore(&tport->tp_lock, flags);
 771
 772         dbg("%s - returns %d", __func__, chars);
 773         return chars;
 774 }
 775
 776
 777 static void ti_throttle(struct usb_serial_port *port)
 778 {
 779         struct ti_port *tport = usb_get_serial_port_data(port);
 780         struct tty_struct *tty;
 781
 782         dbg("%s - port %d", __func__, port->number);
 783
 784         if (tport == NULL)
 785                 return;
 786
 787         tty = port->tty;
 788         if (!tty) {
 789                 dbg("%s - no tty", __func__);
 790                 return;
 791         }
 792
 793         if (I_IXOFF(tty) || C_CRTSCTS(tty))
 794                 ti_stop_read(tport, tty);
 795
 796 }
 797
 798
 799 static void ti_unthrottle(struct usb_serial_port *port)
 800 {
 801         struct ti_port *tport = usb_get_serial_port_data(port);
 802         struct tty_struct *tty;
 803         int status;
 804
 805         dbg("%s - port %d", __func__, port->number);
 806
 807         if (tport == NULL)
 808                 return;
 809
 810         tty = port->tty;
 811         if (!tty) {
 812                 dbg("%s - no tty", __func__);
 813                 return;
 814         }
 815
 816         if (I_IXOFF(tty) || C_CRTSCTS(tty)) {
 817                 status = ti_restart_read(tport, tty);
 818                 if (status)
 819                         dev_err(&port->dev, "%s - cannot restart read, %d\n", __func__, status);
 820         }
 821 }
 822
 823
 824 static int ti_ioctl(struct usb_serial_port *port, struct file *file,
 825         unsigned int cmd, unsigned long arg)
 826 {
 827         struct ti_port *tport = usb_get_serial_port_data(port);
 828         struct async_icount cnow;
 829         struct async_icount cprev;
 830
 831         dbg("%s - port %d, cmd = 0x%04X", __func__, port->number, cmd);
 832
 833         if (tport == NULL)
 834                 return -ENODEV;
 835
 836         switch (cmd) {
 837                 case TIOCGSERIAL:
 838                         dbg("%s - (%d) TIOCGSERIAL", __func__, port->number);
 839                         return ti_get_serial_info(tport, (struct serial_struct __user *)arg);
 840                         break;
 841
 842                 case TIOCSSERIAL:
 843                         dbg("%s - (%d) TIOCSSERIAL", __func__, port->number);
 844                         return ti_set_serial_info(tport, (struct serial_struct __user *)arg);
 845                         break;
 846
 847                 case TIOCMIWAIT:
 848                         dbg("%s - (%d) TIOCMIWAIT", __func__, port->number);
 849                         cprev = tport->tp_icount;
 850                         while (1) {
 851                                 interruptible_sleep_on(&tport->tp_msr_wait);
 852                                 if (signal_pending(current))
 853                                         return -ERESTARTSYS;
 854                                 cnow = tport->tp_icount;
 855                                 if (cnow.rng == cprev.rng && cnow.dsr == cprev.dsr &&
 856                                     cnow.dcd == cprev.dcd && cnow.cts == cprev.cts)
 857                                         return -EIO; /* no change => error */
 858                                 if (((arg & TIOCM_RNG) && (cnow.rng != cprev.rng)) ||
 859                                     ((arg & TIOCM_DSR) && (cnow.dsr != cprev.dsr)) ||
 860                                     ((arg & TIOCM_CD)  && (cnow.dcd != cprev.dcd)) ||
 861                                     ((arg & TIOCM_CTS) && (cnow.cts != cprev.cts)) ) {
 862                                         return 0;
 863                                 }
 864                                 cprev = cnow;
 865                         }
 866                         break;
 867
 868                 case TIOCGICOUNT:
 869                         dbg("%s - (%d) TIOCGICOUNT RX=%d, TX=%d", __func__, port->number, tport->tp_icount.rx, tport->tp_icount.tx);
 870                         if (copy_to_user((void __user *)arg, &tport->tp_icount, sizeof(tport->tp_icount)))
 871                                 return -EFAULT;
 872                         return 0;
 873         }
 874
 875         return -ENOIOCTLCMD;
 876 }
 877
 878
 879 static void ti_set_termios(struct usb_serial_port *port,
 880         struct ktermios *old_termios)
 881 {
 882         struct ti_port *tport = usb_get_serial_port_data(port);
 883         struct tty_struct *tty = port->tty;
 884         struct ti_uart_config *config;
 885         tcflag_t cflag,iflag;
 886         int baud;
 887         int status;
 888         int port_number = port->number - port->serial->minor;
 889         unsigned int mcr;
 890
 891         dbg("%s - port %d", __func__, port->number);
 892
 893         cflag = tty->termios->c_cflag;
 894         iflag = tty->termios->c_iflag;
 895
 896         dbg("%s - cflag %08x, iflag %08x", __func__, cflag, iflag);
 897         dbg("%s - old clfag %08x, old iflag %08x", __func__, old_termios->c_cflag, old_termios->c_iflag);
 898
 899         if (tport == NULL)
 900                 return;
 901
 902         config = kmalloc(sizeof(*config), GFP_KERNEL);
 903         if (!config) {
 904                 dev_err(&port->dev, "%s - out of memory\n", __func__);
 905                 return;
 906         }
 907
 908         config->wFlags = 0;
 909
 910         /* these flags must be set */
 911         config->wFlags |= TI_UART_ENABLE_MS_INTS;
 912         config->wFlags |= TI_UART_ENABLE_AUTO_START_DMA;
 913         config->bUartMode = (__u8)(tport->tp_uart_mode);
 914
 915         switch (cflag & CSIZE) {
 916                 case CS5:
 917                             config->bDataBits = TI_UART_5_DATA_BITS;
 918                             break;
 919                 case CS6:
 920                             config->bDataBits = TI_UART_6_DATA_BITS;
 921                             break;
 922                 case CS7:
 923                             config->bDataBits = TI_UART_7_DATA_BITS;
 924                             break;
 925                 default:
 926                 case CS8:
 927                             config->bDataBits = TI_UART_8_DATA_BITS;
 928                             break;
 929         }
 930
 931         /* CMSPAR isn't supported by this driver */
 932         tty->termios->c_cflag &= ~CMSPAR;
 933
 934         if (cflag & PARENB) {
 935                 if (cflag & PARODD) {
 936                         config->wFlags |= TI_UART_ENABLE_PARITY_CHECKING;
 937                         config->bParity = TI_UART_ODD_PARITY;
 938                 } else {
 939                         config->wFlags |= TI_UART_ENABLE_PARITY_CHECKING;
 940                         config->bParity = TI_UART_EVEN_PARITY;
 941                 }
 942         } else {
 943                 config->wFlags &= ~TI_UART_ENABLE_PARITY_CHECKING;
 944                 config->bParity = TI_UART_NO_PARITY;
 945         }
 946
 947         if (cflag & CSTOPB)
 948                 config->bStopBits = TI_UART_2_STOP_BITS;
 949         else
 950                 config->bStopBits = TI_UART_1_STOP_BITS;
 951
 952         if (cflag & CRTSCTS) {
 953                 /* RTS flow control must be off to drop RTS for baud rate B0 */
 954                 if ((cflag & CBAUD) != B0)
 955                         config->wFlags |= TI_UART_ENABLE_RTS_IN;
 956                 config->wFlags |= TI_UART_ENABLE_CTS_OUT;
 957         } else {
 958                 tty->hw_stopped = 0;
 959                 ti_restart_read(tport, tty);
 960         }
 961
 962         if (I_IXOFF(tty) || I_IXON(tty)) {
 963                 config->cXon  = START_CHAR(tty);
 964                 config->cXoff = STOP_CHAR(tty);
 965
 966                 if (I_IXOFF(tty))
 967                         config->wFlags |= TI_UART_ENABLE_X_IN;
 968                 else
 969                         ti_restart_read(tport, tty);
 970
 971                 if (I_IXON(tty))
 972                         config->wFlags |= TI_UART_ENABLE_X_OUT;
 973         }
 974
 975         baud = tty_get_baud_rate(tty);
 976         if (!baud)
 977                 baud = 9600;
 978         if (tport->tp_tdev->td_is_3410)
 979                 config->wBaudRate = (__u16)((923077 + baud/2) / baud);
 980         else
 981                 config->wBaudRate = (__u16)((461538 + baud/2) / baud);
 982
 983         /* FIXME: Should calculate resulting baud here and report it back */
 984         if ((cflag & CBAUD) != B0)
 985                 tty_encode_baud_rate(tty, baud, baud);
 986
 987         dbg("%s - BaudRate=%d, wBaudRate=%d, wFlags=0x%04X, bDataBits=%d, bParity=%d, bStopBits=%d, cXon=%d, cXoff=%d, bUartMode=%d",
 988         __func__, baud, config->wBaudRate, config->wFlags, config->bDataBits, config->bParity, config->bStopBits, config->cXon, config->cXoff, config->bUartMode);
 989
 990         cpu_to_be16s(&config->wBaudRate);
 991         cpu_to_be16s(&config->wFlags);
 992
 993         status = ti_command_out_sync(tport->tp_tdev, TI_SET_CONFIG,
 994                 (__u8)(TI_UART1_PORT + port_number), 0, (__u8 *)config,
 995                 sizeof(*config));
 996         if (status)
 997                 dev_err(&port->dev, "%s - cannot set config on port %d, %d\n", __func__, port_number, status);
 998
 999         /* SET_CONFIG asserts RTS and DTR, reset them correctly */
1000         mcr = tport->tp_shadow_mcr;
1001         /* if baud rate is B0, clear RTS and DTR */
1002         if ((cflag & CBAUD) == B0)
1003                 mcr &= ~(TI_MCR_DTR | TI_MCR_RTS);
1004         status = ti_set_mcr(tport, mcr);
1005         if (status)
1006                 dev_err(&port->dev, "%s - cannot set modem control on port %d, %d\n", __func__, port_number, status);
1007
1008         kfree(config);
1009 }
1010
1011
1012 static int ti_tiocmget(struct usb_serial_port *port, struct file *file)
1013 {
1014         struct ti_port *tport = usb_get_serial_port_data(port);
1015         unsigned int result;
1016         unsigned int msr;
1017         unsigned int mcr;
1018         unsigned long flags;
1019
1020         dbg("%s - port %d", __func__, port->number);
1021
1022         if (tport == NULL)
1023                 return -ENODEV;
1024
1025         spin_lock_irqsave(&tport->tp_lock, flags);
1026         msr = tport->tp_msr;
1027         mcr = tport->tp_shadow_mcr;
1028         spin_unlock_irqrestore(&tport->tp_lock, flags);
1029
1030         result = ((mcr & TI_MCR_DTR) ? TIOCM_DTR : 0)
1031                 | ((mcr & TI_MCR_RTS) ? TIOCM_RTS : 0)
1032                 | ((mcr & TI_MCR_LOOP) ? TIOCM_LOOP : 0)
1033                 | ((msr & TI_MSR_CTS) ? TIOCM_CTS : 0)
1034                 | ((msr & TI_MSR_CD) ? TIOCM_CAR : 0)
1035                 | ((msr & TI_MSR_RI) ? TIOCM_RI : 0)
1036                 | ((msr & TI_MSR_DSR) ? TIOCM_DSR : 0);
1037
1038         dbg("%s - 0x%04X", __func__, result);
1039
1040         return result;
1041 }
1042
1043
1044 static int ti_tiocmset(struct usb_serial_port *port, struct file *file,
1045         unsigned int set, unsigned int clear)
1046 {
1047         struct ti_port *tport = usb_get_serial_port_data(port);
1048         unsigned int mcr;
1049         unsigned long flags;
1050
1051         dbg("%s - port %d", __func__, port->number);
1052
1053         if (tport == NULL)
1054                 return -ENODEV;
1055
1056         spin_lock_irqsave(&tport->tp_lock, flags);
1057         mcr = tport->tp_shadow_mcr;
1058
1059         if (set & TIOCM_RTS)
1060                 mcr |= TI_MCR_RTS;
1061         if (set & TIOCM_DTR)
1062                 mcr |= TI_MCR_DTR;
1063         if (set & TIOCM_LOOP)
1064                 mcr |= TI_MCR_LOOP;
1065
1066         if (clear & TIOCM_RTS)
1067                 mcr &= ~TI_MCR_RTS;
1068         if (clear & TIOCM_DTR)
1069                 mcr &= ~TI_MCR_DTR;
1070         if (clear & TIOCM_LOOP)
1071                 mcr &= ~TI_MCR_LOOP;
1072         spin_unlock_irqrestore(&tport->tp_lock, flags);
1073
1074         return ti_set_mcr(tport, mcr);
1075 }
1076
1077
1078 static void ti_break(struct usb_serial_port *port, int break_state)
1079 {
1080         struct ti_port *tport = usb_get_serial_port_data(port);
1081         int status;
1082
1083         dbg("%s - state = %d", __func__, break_state);
1084
1085         if (tport == NULL)
1086                 return;
1087
1088         ti_drain(tport, (tport->tp_closing_wait*HZ)/100, 0);
1089
1090         status = ti_write_byte(tport->tp_tdev,
1091                 tport->tp_uart_base_addr + TI_UART_OFFSET_LCR,
1092                 TI_LCR_BREAK, break_state == -1 ? TI_LCR_BREAK : 0);
1093
1094         if (status)
1095                 dbg("%s - error setting break, %d", __func__, status);
1096 }
1097
1098
1099 static void ti_interrupt_callback(struct urb *urb)
1100 {
1101         struct ti_device *tdev = urb->context;
1102         struct usb_serial_port *port;
1103         struct usb_serial *serial = tdev->td_serial;
1104         struct ti_port *tport;
1105         struct device *dev = &urb->dev->dev;
1106         unsigned char *data = urb->transfer_buffer;
1107         int length = urb->actual_length;
1108         int port_number;
1109         int function;
1110         int status = urb->status;
1111         int retval;
1112         __u8 msr;
1113
1114         dbg("%s", __func__);
1115
1116         switch (status) {
1117         case 0:
1118                 break;
1119         case -ECONNRESET:
1120         case -ENOENT:
1121         case -ESHUTDOWN:
1122                 dbg("%s - urb shutting down, %d", __func__, status);
1123                 tdev->td_urb_error = 1;
1124                 return;
1125         default:
1126                 dev_err(dev, "%s - nonzero urb status, %d\n",
1127                         __func__, status);
1128                 tdev->td_urb_error = 1;
1129                 goto exit;
1130         }
1131
1132         if (length != 2) {
1133                 dbg("%s - bad packet size, %d", __func__, length);
1134                 goto exit;
1135         }
1136
1137         if (data[0] == TI_CODE_HARDWARE_ERROR) {
1138                 dev_err(dev, "%s - hardware error, %d\n", __func__, data[1]);
1139                 goto exit;
1140         }
1141
1142         port_number = TI_GET_PORT_FROM_CODE(data[0]);
1143         function = TI_GET_FUNC_FROM_CODE(data[0]);
1144
1145         dbg("%s - port_number %d, function %d, data 0x%02X", __func__, port_number, function, data[1]);
1146
1147         if (port_number >= serial->num_ports) {
1148                 dev_err(dev, "%s - bad port number, %d\n", __func__, port_number);
1149                 goto exit;
1150         }
1151
1152         port = serial->port[port_number];
1153
1154         tport = usb_get_serial_port_data(port);
1155         if (!tport)
1156                 goto exit;
1157
1158         switch (function) {
1159         case TI_CODE_DATA_ERROR:
1160                 dev_err(dev, "%s - DATA ERROR, port %d, data 0x%02X\n", __func__, port_number, data[1]);
1161                 break;
1162
1163         case TI_CODE_MODEM_STATUS:
1164                 msr = data[1];
1165                 dbg("%s - port %d, msr 0x%02X", __func__, port_number, msr);
1166                 ti_handle_new_msr(tport, msr);
1167                 break;
1168
1169         default:
1170                 dev_err(dev, "%s - unknown interrupt code, 0x%02X\n", __func__, data[1]);
1171                 break;
1172         }
1173
1174 exit:
1175         retval = usb_submit_urb(urb, GFP_ATOMIC);
1176         if (retval)
1177                 dev_err(dev, "%s - resubmit interrupt urb failed, %d\n",
1178                         __func__, retval);
1179 }
1180
1181
1182 static void ti_bulk_in_callback(struct urb *urb)
1183 {
1184         struct ti_port *tport = urb->context;
1185         struct usb_serial_port *port = tport->tp_port;
1186         struct device *dev = &urb->dev->dev;
1187         int status = urb->status;
1188         int retval = 0;
1189
1190         dbg("%s", __func__);
1191
1192         switch (status) {
1193         case 0:
1194                 break;
1195         case -ECONNRESET:
1196         case -ENOENT:
1197         case -ESHUTDOWN:
1198                 dbg("%s - urb shutting down, %d", __func__, status);
1199                 tport->tp_tdev->td_urb_error = 1;
1200                 wake_up_interruptible(&tport->tp_write_wait);
1201                 return;
1202         default:
1203                 dev_err(dev, "%s - nonzero urb status, %d\n",
1204                         __func__, status );
1205                 tport->tp_tdev->td_urb_error = 1;
1206                 wake_up_interruptible(&tport->tp_write_wait);
1207         }
1208
1209         if (status == -EPIPE)
1210                 goto exit;
1211
1212         if (status) {
1213                 dev_err(dev, "%s - stopping read!\n", __func__);
1214                 return;
1215         }
1216
1217         if (port->tty && urb->actual_length) {
1218                 usb_serial_debug_data(debug, dev, __func__,
1219                         urb->actual_length, urb->transfer_buffer);
1220
1221                 if (!tport->tp_is_open)
1222                         dbg("%s - port closed, dropping data", __func__);
1223                 else
1224                         ti_recv(&urb->dev->dev, port->tty, urb->transfer_buffer,
1225                                 urb->actual_length);
1226
1227                 spin_lock(&tport->tp_lock);
1228                 tport->tp_icount.rx += urb->actual_length;
1229                 spin_unlock(&tport->tp_lock);
1230         }
1231
1232 exit:
1233         /* continue to read unless stopping */
1234         spin_lock(&tport->tp_lock);
1235         if (tport->tp_read_urb_state == TI_READ_URB_RUNNING) {
1236                 urb->dev = port->serial->dev;
1237                 retval = usb_submit_urb(urb, GFP_ATOMIC);
1238         } else if (tport->tp_read_urb_state == TI_READ_URB_STOPPING) {
1239                 tport->tp_read_urb_state = TI_READ_URB_STOPPED;
1240         }
1241         spin_unlock(&tport->tp_lock);
1242         if (retval)
1243                 dev_err(dev, "%s - resubmit read urb failed, %d\n",
1244                         __func__, retval);
1245 }
1246
1247
1248 static void ti_bulk_out_callback(struct urb *urb)
1249 {
1250         struct ti_port *tport = urb->context;
1251         struct usb_serial_port *port = tport->tp_port;
1252         struct device *dev = &urb->dev->dev;
1253         int status = urb->status;
1254
1255         dbg("%s - port %d", __func__, port->number);
1256
1257         tport->tp_write_urb_in_use = 0;
1258
1259         switch (status) {
1260         case 0:
1261                 break;
1262         case -ECONNRESET:
1263         case -ENOENT:
1264         case -ESHUTDOWN:
1265                 dbg("%s - urb shutting down, %d", __func__, status);
1266                 tport->tp_tdev->td_urb_error = 1;
1267                 wake_up_interruptible(&tport->tp_write_wait);
1268                 return;
1269         default:
1270                 dev_err(dev, "%s - nonzero urb status, %d\n",
1271                         __func__, status);
1272                 tport->tp_tdev->td_urb_error = 1;
1273                 wake_up_interruptible(&tport->tp_write_wait);
1274         }
1275
1276         /* send any buffered data */
1277         ti_send(tport);
1278 }
1279
1280
1281 static void ti_recv(struct device *dev, struct tty_struct *tty,
1282         unsigned char *data, int length)
1283 {
1284         int cnt;
1285
1286         do {
1287                 cnt = tty_buffer_request_room(tty, length);
1288                 if (cnt < length) {
1289                         dev_err(dev, "%s - dropping data, %d bytes lost\n", __func__, length - cnt);
1290                         if(cnt == 0)
1291                                 break;
1292                 }
1293                 tty_insert_flip_string(tty, data, cnt);
1294                 tty_flip_buffer_push(tty);
1295                 data += cnt;
1296                 length -= cnt;
1297         } while (length > 0);
1298
1299 }
1300
1301
1302 static void ti_send(struct ti_port *tport)
1303 {
1304         int count, result;
1305         struct usb_serial_port *port = tport->tp_port;
1306         struct tty_struct *tty = port->tty;
1307         unsigned long flags;
1308
1309
1310         dbg("%s - port %d", __func__, port->number);
1311
1312         spin_lock_irqsave(&tport->tp_lock, flags);
1313
1314         if (tport->tp_write_urb_in_use) {
1315                 spin_unlock_irqrestore(&tport->tp_lock, flags);
1316                 return;
1317         }
1318
1319         count = ti_buf_get(tport->tp_write_buf,
1320                                 port->write_urb->transfer_buffer,
1321                                 port->bulk_out_size);
1322
1323         if (count == 0) {
1324                 spin_unlock_irqrestore(&tport->tp_lock, flags);
1325                 return;
1326         }
1327
1328         tport->tp_write_urb_in_use = 1;
1329
1330         spin_unlock_irqrestore(&tport->tp_lock, flags);
1331
1332         usb_serial_debug_data(debug, &port->dev, __func__, count, port->write_urb->transfer_buffer);
1333
1334         usb_fill_bulk_urb(port->write_urb, port->serial->dev,
1335                            usb_sndbulkpipe(port->serial->dev,
1336                                             port->bulk_out_endpointAddress),
1337                            port->write_urb->transfer_buffer, count,
1338                            ti_bulk_out_callback, tport);
1339
1340         result = usb_submit_urb(port->write_urb, GFP_ATOMIC);
1341         if (result) {
1342                 dev_err(&port->dev, "%s - submit write urb failed, %d\n", __func__, result);
1343                 tport->tp_write_urb_in_use = 0;
1344                 /* TODO: reschedule ti_send */
1345         } else {
1346                 spin_lock_irqsave(&tport->tp_lock, flags);
1347                 tport->tp_icount.tx += count;
1348                 spin_unlock_irqrestore(&tport->tp_lock, flags);
1349         }
1350
1351         /* more room in the buffer for new writes, wakeup */
1352         if (tty)
1353                 tty_wakeup(tty);
1354         wake_up_interruptible(&tport->tp_write_wait);
1355 }
1356
1357
1358 static int ti_set_mcr(struct ti_port *tport, unsigned int mcr)
1359 {
1360         unsigned long flags;
1361         int status;
1362
1363         status = ti_write_byte(tport->tp_tdev,
1364                 tport->tp_uart_base_addr + TI_UART_OFFSET_MCR,
1365                 TI_MCR_RTS | TI_MCR_DTR | TI_MCR_LOOP, mcr);
1366
1367         spin_lock_irqsave(&tport->tp_lock, flags);
1368         if (!status)
1369                 tport->tp_shadow_mcr = mcr;
1370         spin_unlock_irqrestore(&tport->tp_lock, flags);
1371
1372         return status;
1373 }
1374
1375
1376 static int ti_get_lsr(struct ti_port *tport)
1377 {
1378         int size,status;
1379         struct ti_device *tdev = tport->tp_tdev;
1380         struct usb_serial_port *port = tport->tp_port;
1381         int port_number = port->number - port->serial->minor;
1382         struct ti_port_status *data;
1383
1384         dbg("%s - port %d", __func__, port->number);
1385
1386         size = sizeof(struct ti_port_status);
1387         data = kmalloc(size, GFP_KERNEL);
1388         if (!data) {
1389                 dev_err(&port->dev, "%s - out of memory\n", __func__);
1390                 return -ENOMEM;
1391         }
1392
1393         status = ti_command_in_sync(tdev, TI_GET_PORT_STATUS,
1394                 (__u8)(TI_UART1_PORT+port_number), 0, (__u8 *)data, size);
1395         if (status) {
1396                 dev_err(&port->dev, "%s - get port status command failed, %d\n", __func__, status);
1397                 goto free_data;
1398         }
1399
1400         dbg("%s - lsr 0x%02X", __func__, data->bLSR);
1401
1402         tport->tp_lsr = data->bLSR;
1403
1404 free_data:
1405         kfree(data);
1406         return status;
1407 }
1408
1409
1410 static int ti_get_serial_info(struct ti_port *tport,
1411         struct serial_struct __user *ret_arg)
1412 {
1413         struct usb_serial_port *port = tport->tp_port;
1414         struct serial_struct ret_serial;
1415
1416         if (!ret_arg)
1417                 return -EFAULT;
1418
1419         memset(&ret_serial, 0, sizeof(ret_serial));
1420
1421         ret_serial.type = PORT_16550A;
1422         ret_serial.line = port->serial->minor;
1423         ret_serial.port = port->number - port->serial->minor;
1424         ret_serial.flags = tport->tp_flags;
1425         ret_serial.xmit_fifo_size = TI_WRITE_BUF_SIZE;
1426         ret_serial.baud_base = tport->tp_tdev->td_is_3410 ? 921600 : 460800;
1427         ret_serial.closing_wait = tport->tp_closing_wait;
1428
1429         if (copy_to_user(ret_arg, &ret_serial, sizeof(*ret_arg)))
1430                 return -EFAULT;
1431
1432         return 0;
1433 }
1434
1435
1436 static int ti_set_serial_info(struct ti_port *tport,
1437         struct serial_struct __user *new_arg)
1438 {
1439         struct usb_serial_port *port = tport->tp_port;
1440         struct serial_struct new_serial;
1441
1442         if (copy_from_user(&new_serial, new_arg, sizeof(new_serial)))
1443                 return -EFAULT;
1444
1445         tport->tp_flags = new_serial.flags & TI_SET_SERIAL_FLAGS;
1446         if (port->tty)
1447                 port->tty->low_latency =
1448                         (tport->tp_flags & ASYNC_LOW_LATENCY) ? 1 : 0;
1449         tport->tp_closing_wait = new_serial.closing_wait;
1450
1451         return 0;
1452 }
1453
1454
1455 static void ti_handle_new_msr(struct ti_port *tport, __u8 msr)
1456 {
1457         struct async_icount *icount;
1458         struct tty_struct *tty;
1459         unsigned long flags;
1460
1461         dbg("%s - msr 0x%02X", __func__, msr);
1462
1463         if (msr & TI_MSR_DELTA_MASK) {
1464                 spin_lock_irqsave(&tport->tp_lock, flags);
1465                 icount = &tport->tp_icount;
1466                 if (msr & TI_MSR_DELTA_CTS)
1467                         icount->cts++;
1468                 if (msr & TI_MSR_DELTA_DSR)
1469                         icount->dsr++;
1470                 if (msr & TI_MSR_DELTA_CD)
1471                         icount->dcd++;
1472                 if (msr & TI_MSR_DELTA_RI)
1473                         icount->rng++;
1474                 wake_up_interruptible(&tport->tp_msr_wait);
1475                 spin_unlock_irqrestore(&tport->tp_lock, flags);
1476         }
1477
1478         tport->tp_msr = msr & TI_MSR_MASK;
1479
1480         /* handle CTS flow control */
1481         tty = tport->tp_port->tty;
1482         if (tty && C_CRTSCTS(tty)) {
1483                 if (msr & TI_MSR_CTS) {
1484                         tty->hw_stopped = 0;
1485                         tty_wakeup(tty);
1486                 } else {
1487                         tty->hw_stopped = 1;
1488                 }
1489         }
1490 }
1491
1492
1493 static void ti_drain(struct ti_port *tport, unsigned long timeout, int flush)
1494 {
1495         struct ti_device *tdev = tport->tp_tdev;
1496         struct usb_serial_port *port = tport->tp_port;
1497         wait_queue_t wait;
1498
1499         dbg("%s - port %d", __func__, port->number);
1500
1501         spin_lock_irq(&tport->tp_lock);
1502
1503         /* wait for data to drain from the buffer */
1504         tdev->td_urb_error = 0;
1505         init_waitqueue_entry(&wait, current);
1506         add_wait_queue(&tport->tp_write_wait, &wait);
1507         for (;;) {
1508                 set_current_state(TASK_INTERRUPTIBLE);
1509                 if (ti_buf_data_avail(tport->tp_write_buf) == 0
1510                 || timeout == 0 || signal_pending(current)
1511                 || tdev->td_urb_error
1512                 || port->serial->disconnected)  /* disconnect */
1513                         break;
1514                 spin_unlock_irq(&tport->tp_lock);
1515                 timeout = schedule_timeout(timeout);
1516                 spin_lock_irq(&tport->tp_lock);
1517         }
1518         set_current_state(TASK_RUNNING);
1519         remove_wait_queue(&tport->tp_write_wait, &wait);
1520
1521         /* flush any remaining data in the buffer */
1522         if (flush)
1523                 ti_buf_clear(tport->tp_write_buf);
1524
1525         spin_unlock_irq(&tport->tp_lock);
1526
1527         mutex_lock(&port->serial->disc_mutex);
1528         /* wait for data to drain from the device */
1529         /* wait for empty tx register, plus 20 ms */
1530         timeout += jiffies;
1531         tport->tp_lsr &= ~TI_LSR_TX_EMPTY;
1532         while ((long)(jiffies - timeout) < 0 && !signal_pending(current)
1533         && !(tport->tp_lsr&TI_LSR_TX_EMPTY) && !tdev->td_urb_error
1534         && !port->serial->disconnected) {
1535                 if (ti_get_lsr(tport))
1536                         break;
1537                 mutex_unlock(&port->serial->disc_mutex);
1538                 msleep_interruptible(20);
1539                 mutex_lock(&port->serial->disc_mutex);
1540         }
1541         mutex_unlock(&port->serial->disc_mutex);
1542 }
1543
1544
1545 static void ti_stop_read(struct ti_port *tport, struct tty_struct *tty)
1546 {
1547         unsigned long flags;
1548
1549         spin_lock_irqsave(&tport->tp_lock, flags);
1550
1551         if (tport->tp_read_urb_state == TI_READ_URB_RUNNING)
1552                 tport->tp_read_urb_state = TI_READ_URB_STOPPING;
1553
1554         spin_unlock_irqrestore(&tport->tp_lock, flags);
1555 }
1556
1557
1558 static int ti_restart_read(struct ti_port *tport, struct tty_struct *tty)
1559 {
1560         struct urb *urb;
1561         int status = 0;
1562         unsigned long flags;
1563
1564         spin_lock_irqsave(&tport->tp_lock, flags);
1565
1566         if (tport->tp_read_urb_state == TI_READ_URB_STOPPED) {
1567                 tport->tp_read_urb_state = TI_READ_URB_RUNNING;
1568                 urb = tport->tp_port->read_urb;
1569                 spin_unlock_irqrestore(&tport->tp_lock, flags);
1570                 urb->complete = ti_bulk_in_callback;
1571                 urb->context = tport;
1572                 urb->dev = tport->tp_port->serial->dev;
1573                 status = usb_submit_urb(urb, GFP_KERNEL);
1574         } else  {
1575                 tport->tp_read_urb_state = TI_READ_URB_RUNNING;
1576                 spin_unlock_irqrestore(&tport->tp_lock, flags);
1577         }
1578
1579         return status;
1580 }
1581
1582
1583 static int ti_command_out_sync(struct ti_device *tdev, __u8 command,
1584         __u16 moduleid, __u16 value, __u8 *data, int size)
1585 {
1586         int status;
1587
1588         status = usb_control_msg(tdev->td_serial->dev,
1589                 usb_sndctrlpipe(tdev->td_serial->dev, 0), command,
1590                 (USB_TYPE_VENDOR | USB_RECIP_DEVICE | USB_DIR_OUT),
1591                 value, moduleid, data, size, 1000);
1592
1593         if (status == size)
1594                 status = 0;
1595
1596         if (status > 0)
1597                 status = -ECOMM;
1598
1599         return status;
1600 }
1601
1602
1603 static int ti_command_in_sync(struct ti_device *tdev, __u8 command,
1604         __u16 moduleid, __u16 value, __u8 *data, int size)
1605 {
1606         int status;
1607
1608         status = usb_control_msg(tdev->td_serial->dev,
1609                 usb_rcvctrlpipe(tdev->td_serial->dev, 0), command,
1610                 (USB_TYPE_VENDOR | USB_RECIP_DEVICE | USB_DIR_IN),
1611                 value, moduleid, data, size, 1000);
1612
1613         if (status == size)
1614                 status = 0;
1615
1616         if (status > 0)
1617                 status = -ECOMM;
1618
1619         return status;
1620 }
1621
1622
1623 static int ti_write_byte(struct ti_device *tdev, unsigned long addr,
1624         __u8 mask, __u8 byte)
1625 {
1626         int status;
1627         unsigned int size;
1628         struct ti_write_data_bytes *data;
1629         struct device *dev = &tdev->td_serial->dev->dev;
1630
1631         dbg("%s - addr 0x%08lX, mask 0x%02X, byte 0x%02X", __func__, addr, mask, byte);
1632
1633         size = sizeof(struct ti_write_data_bytes) + 2;
1634         data = kmalloc(size, GFP_KERNEL);
1635         if (!data) {
1636                 dev_err(dev, "%s - out of memory\n", __func__);
1637                 return -ENOMEM;
1638         }
1639
1640         data->bAddrType = TI_RW_DATA_ADDR_XDATA;
1641         data->bDataType = TI_RW_DATA_BYTE;
1642         data->bDataCounter = 1;
1643         data->wBaseAddrHi = cpu_to_be16(addr>>16);
1644         data->wBaseAddrLo = cpu_to_be16(addr);
1645         data->bData[0] = mask;
1646         data->bData[1] = byte;
1647
1648         status = ti_command_out_sync(tdev, TI_WRITE_DATA, TI_RAM_PORT, 0,
1649                 (__u8 *)data, size);
1650
1651         if (status < 0)
1652                 dev_err(dev, "%s - failed, %d\n", __func__, status);
1653
1654         kfree(data);
1655
1656         return status;
1657 }
1658
1659
1660 static int ti_download_firmware(struct ti_device *tdev,
1661         unsigned char *firmware, unsigned int firmware_size)
1662 {
1663         int status = 0;
1664         int buffer_size;
1665         int pos;
1666         int len;
1667         int done;
1668         __u8 cs = 0;
1669         __u8 *buffer;
1670         struct usb_device *dev = tdev->td_serial->dev;
1671         struct ti_firmware_header *header;
1672         unsigned int pipe = usb_sndbulkpipe(dev,
1673                 tdev->td_serial->port[0]->bulk_out_endpointAddress);
1674
1675
1676         buffer_size = TI_FIRMWARE_BUF_SIZE + sizeof(struct ti_firmware_header);
1677         buffer = kmalloc(buffer_size, GFP_KERNEL);
1678         if (!buffer) {
1679                 dev_err(&dev->dev, "%s - out of memory\n", __func__);
1680                 return -ENOMEM;
1681         }
1682
1683         memcpy(buffer, firmware, firmware_size);
1684         memset(buffer+firmware_size, 0xff, buffer_size-firmware_size);
1685
1686         for(pos = sizeof(struct ti_firmware_header); pos < buffer_size; pos++)
1687                 cs = (__u8)(cs + buffer[pos]);
1688
1689         header = (struct ti_firmware_header *)buffer;
1690         header->wLength = cpu_to_le16((__u16)(buffer_size - sizeof(struct ti_firmware_header)));
1691         header->bCheckSum = cs;
1692
1693         dbg("%s - downloading firmware", __func__);
1694         for (pos = 0; pos < buffer_size; pos += done) {
1695                 len = min(buffer_size - pos, TI_DOWNLOAD_MAX_PACKET_SIZE);
1696                 status = usb_bulk_msg(dev, pipe, buffer+pos, len, &done, 1000);
1697                 if (status)
1698                         break;
1699         }
1700
1701         kfree(buffer);
1702
1703         if (status) {
1704                 dev_err(&dev->dev, "%s - error downloading firmware, %d\n", __func__, status);
1705                 return status;
1706         }
1707
1708         dbg("%s - download successful", __func__);
1709
1710         return 0;
1711 }
1712
1713
1714 /* Circular Buffer Functions */
1715
1716 /*
1717  * ti_buf_alloc
1718  *
1719  * Allocate a circular buffer and all associated memory.
1720  */
1721
1722 static struct circ_buf *ti_buf_alloc(void)
1723 {
1724         struct circ_buf *cb;
1725
1726         cb = kmalloc(sizeof(struct circ_buf), GFP_KERNEL);
1727         if (cb == NULL)
1728                 return NULL;
1729
1730         cb->buf = kmalloc(TI_WRITE_BUF_SIZE, GFP_KERNEL);
1731         if (cb->buf == NULL) {
1732                 kfree(cb);
1733                 return NULL;
1734         }
1735
1736         ti_buf_clear(cb);
1737
1738         return cb;
1739 }
1740
1741
1742 /*
1743  * ti_buf_free
1744  *
1745  * Free the buffer and all associated memory.
1746  */
1747
1748 static void ti_buf_free(struct circ_buf *cb)
1749 {
1750         kfree(cb->buf);
1751         kfree(cb);
1752 }
1753
1754
1755 /*
1756  * ti_buf_clear
1757  *
1758  * Clear out all data in the circular buffer.
1759  */
1760
1761 static void ti_buf_clear(struct circ_buf *cb)
1762 {
1763         cb->head = cb->tail = 0;
1764 }
1765
1766
1767 /*
1768  * ti_buf_data_avail
1769  *
1770  * Return the number of bytes of data available in the circular
1771  * buffer.
1772  */
1773
1774 static int ti_buf_data_avail(struct circ_buf *cb)
1775 {
1776         return CIRC_CNT(cb->head,cb->tail,TI_WRITE_BUF_SIZE);
1777 }
1778
1779
1780 /*
1781  * ti_buf_space_avail
1782  *
1783  * Return the number of bytes of space available in the circular
1784  * buffer.
1785  */
1786
1787 static int ti_buf_space_avail(struct circ_buf *cb)
1788 {
1789         return CIRC_SPACE(cb->head,cb->tail,TI_WRITE_BUF_SIZE);
1790 }
1791
1792
1793 /*
1794  * ti_buf_put
1795  *
1796  * Copy data data from a user buffer and put it into the circular buffer.
1797  * Restrict to the amount of space available.
1798  *
1799  * Return the number of bytes copied.
1800  */
1801
1802 static int ti_buf_put(struct circ_buf *cb, const char *buf, int count)
1803 {
1804         int c, ret = 0;
1805
1806         while (1) {
1807                 c = CIRC_SPACE_TO_END(cb->head, cb->tail, TI_WRITE_BUF_SIZE);
1808                 if (count < c)
1809                         c = count;
1810                 if (c <= 0)
1811                         break;
1812                 memcpy(cb->buf + cb->head, buf, c);
1813                 cb->head = (cb->head + c) & (TI_WRITE_BUF_SIZE-1);
1814                 buf += c;
1815                 count -= c;
1816                 ret += c;
1817         }
1818
1819         return ret;
1820 }
1821
1822
1823 /*
1824  * ti_buf_get
1825  *
1826  * Get data from the circular buffer and copy to the given buffer.
1827  * Restrict to the amount of data available.
1828  *
1829  * Return the number of bytes copied.
1830  */
1831
1832 static int ti_buf_get(struct circ_buf *cb, char *buf, int count)
1833 {
1834         int c, ret = 0;
1835
1836         while (1) {
1837                 c = CIRC_CNT_TO_END(cb->head, cb->tail, TI_WRITE_BUF_SIZE);
1838                 if (count < c)
1839                         c = count;
1840                 if (c <= 0)
1841                         break;
1842                 memcpy(buf, cb->buf + cb->tail, c);
1843                 cb->tail = (cb->tail + c) & (TI_WRITE_BUF_SIZE-1);
1844                 buf += c;
1845                 count -= c;
1846                 ret += c;
1847         }
1848
1849         return ret;
1850 }