git.oblomov.eu Git - 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
  21 #include <linux/kernel.h>
  22 #include <linux/errno.h>
  23 #include <linux/firmware.h>
  24 #include <linux/init.h>
  25 #include <linux/slab.h>
  26 #include <linux/tty.h>
  27 #include <linux/tty_driver.h>
  28 #include <linux/tty_flip.h>
  29 #include <linux/module.h>
  30 #include <linux/spinlock.h>
  31 #include <linux/ioctl.h>
  32 #include <linux/serial.h>
  33 #include <linux/circ_buf.h>
  34 #include <linux/mutex.h>
  35 #include <linux/uaccess.h>
  36 #include <linux/usb.h>
  37 #include <linux/usb/serial.h>
  38
  39 #include "ti_usb_3410_5052.h"
  40
  41 /* Defines */
  42
  43 #define TI_DRIVER_VERSION       "v0.9"
  44 #define TI_DRIVER_AUTHOR        "Al Borchers <alborchers@steinerpoint.com>"
  45 #define TI_DRIVER_DESC          "TI USB 3410/5052 Serial Driver"
  46
  47 #define TI_FIRMWARE_BUF_SIZE    16284
  48
  49 #define TI_WRITE_BUF_SIZE       1024
  50
  51 #define TI_TRANSFER_TIMEOUT     2
  52
  53 #define TI_DEFAULT_CLOSING_WAIT 4000            /* in .01 secs */
  54
  55 /* supported setserial flags */
  56 #define TI_SET_SERIAL_FLAGS     0
  57
  58 /* read urb states */
  59 #define TI_READ_URB_RUNNING     0
  60 #define TI_READ_URB_STOPPING    1
  61 #define TI_READ_URB_STOPPED     2
  62
  63 #define TI_EXTRA_VID_PID_COUNT  5
  64
  65
  66 /* Structures */
  67
  68 struct ti_port {
  69         int                     tp_is_open;
  70         __u8                    tp_msr;
  71         __u8                    tp_lsr;
  72         __u8                    tp_shadow_mcr;
  73         __u8                    tp_uart_mode;   /* 232 or 485 modes */
  74         unsigned int            tp_uart_base_addr;
  75         int                     tp_flags;
  76         int                     tp_closing_wait;/* in .01 secs */
  77         struct async_icount     tp_icount;
  78         wait_queue_head_t       tp_msr_wait;    /* wait for msr change */
  79         wait_queue_head_t       tp_write_wait;
  80         struct ti_device        *tp_tdev;
  81         struct usb_serial_port  *tp_port;
  82         spinlock_t              tp_lock;
  83         int                     tp_read_urb_state;
  84         int                     tp_write_urb_in_use;
  85         struct circ_buf         *tp_write_buf;
  86 };
  87
  88 struct ti_device {
  89         struct mutex            td_open_close_lock;
  90         int                     td_open_port_count;
  91         struct usb_serial       *td_serial;
  92         int                     td_is_3410;
  93         int                     td_urb_error;
  94 };
  95
  96
  97 /* Function Declarations */
  98
  99 static int ti_startup(struct usb_serial *serial);
 100 static void ti_shutdown(struct usb_serial *serial);
 101 static int ti_open(struct tty_struct *tty, struct usb_serial_port *port,
 102                 struct file *file);
 103 static void ti_close(struct usb_serial_port *port);
 104 static int ti_write(struct tty_struct *tty, struct usb_serial_port *port,
 105                 const unsigned char *data, int count);
 106 static int ti_write_room(struct tty_struct *tty);
 107 static int ti_chars_in_buffer(struct tty_struct *tty);
 108 static void ti_throttle(struct tty_struct *tty);
 109 static void ti_unthrottle(struct tty_struct *tty);
 110 static int ti_ioctl(struct tty_struct *tty, struct file *file,
 111                 unsigned int cmd, unsigned long arg);
 112 static void ti_set_termios(struct tty_struct *tty,
 113                 struct usb_serial_port *port, struct ktermios *old_termios);
 114 static int ti_tiocmget(struct tty_struct *tty, struct file *file);
 115 static int ti_tiocmset(struct tty_struct *tty, struct file *file,
 116                 unsigned int set, unsigned int clear);
 117 static void ti_break(struct tty_struct *tty, int break_state);
 118 static void ti_interrupt_callback(struct urb *urb);
 119 static void ti_bulk_in_callback(struct urb *urb);
 120 static void ti_bulk_out_callback(struct urb *urb);
 121
 122 static void ti_recv(struct device *dev, struct tty_struct *tty,
 123         unsigned char *data, int length);
 124 static void ti_send(struct ti_port *tport);
 125 static int ti_set_mcr(struct ti_port *tport, unsigned int mcr);
 126 static int ti_get_lsr(struct ti_port *tport);
 127 static int ti_get_serial_info(struct ti_port *tport,
 128         struct serial_struct __user *ret_arg);
 129 static int ti_set_serial_info(struct tty_struct *tty, struct ti_port *tport,
 130         struct serial_struct __user *new_arg);
 131 static void ti_handle_new_msr(struct ti_port *tport, __u8 msr);
 132
 133 static void ti_drain(struct ti_port *tport, unsigned long timeout, int flush);
 134
 135 static void ti_stop_read(struct ti_port *tport, struct tty_struct *tty);
 136 static int ti_restart_read(struct ti_port *tport, struct tty_struct *tty);
 137
 138 static int ti_command_out_sync(struct ti_device *tdev, __u8 command,
 139         __u16 moduleid, __u16 value, __u8 *data, int size);
 140 static int ti_command_in_sync(struct ti_device *tdev, __u8 command,
 141         __u16 moduleid, __u16 value, __u8 *data, int size);
 142
 143 static int ti_write_byte(struct ti_device *tdev, unsigned long addr,
 144         __u8 mask, __u8 byte);
 145
 146 static int ti_download_firmware(struct ti_device *tdev);
 147
 148 /* circular buffer */
 149 static struct circ_buf *ti_buf_alloc(void);
 150 static void ti_buf_free(struct circ_buf *cb);
 151 static void ti_buf_clear(struct circ_buf *cb);
 152 static int ti_buf_data_avail(struct circ_buf *cb);
 153 static int ti_buf_space_avail(struct circ_buf *cb);
 154 static int ti_buf_put(struct circ_buf *cb, const char *buf, int count);
 155 static int ti_buf_get(struct circ_buf *cb, char *buf, int count);
 156
 157
 158 /* Data */
 159
 160 /* module parameters */
 161 static int debug;
 162 static int closing_wait = TI_DEFAULT_CLOSING_WAIT;
 163 static ushort vendor_3410[TI_EXTRA_VID_PID_COUNT];
 164 static unsigned int vendor_3410_count;
 165 static ushort product_3410[TI_EXTRA_VID_PID_COUNT];
 166 static unsigned int product_3410_count;
 167 static ushort vendor_5052[TI_EXTRA_VID_PID_COUNT];
 168 static unsigned int vendor_5052_count;
 169 static ushort product_5052[TI_EXTRA_VID_PID_COUNT];
 170 static unsigned int product_5052_count;
 171
 172 /* supported devices */
 173 /* the array dimension is the number of default entries plus */
 174 /* TI_EXTRA_VID_PID_COUNT user defined entries plus 1 terminating */
 175 /* null entry */
 176 static struct usb_device_id ti_id_table_3410[10+TI_EXTRA_VID_PID_COUNT+1] = {
 177         { USB_DEVICE(TI_VENDOR_ID, TI_3410_PRODUCT_ID) },
 178         { USB_DEVICE(TI_VENDOR_ID, TI_3410_EZ430_ID) },
 179         { USB_DEVICE(MTS_VENDOR_ID, MTS_GSM_NO_FW_PRODUCT_ID) },
 180         { USB_DEVICE(MTS_VENDOR_ID, MTS_CDMA_NO_FW_PRODUCT_ID) },
 181         { USB_DEVICE(MTS_VENDOR_ID, MTS_CDMA_PRODUCT_ID) },
 182         { USB_DEVICE(MTS_VENDOR_ID, MTS_GSM_PRODUCT_ID) },
 183         { USB_DEVICE(MTS_VENDOR_ID, MTS_EDGE_PRODUCT_ID) },
 184         { USB_DEVICE(IBM_VENDOR_ID, IBM_4543_PRODUCT_ID) },
 185         { USB_DEVICE(IBM_VENDOR_ID, IBM_454B_PRODUCT_ID) },
 186         { USB_DEVICE(IBM_VENDOR_ID, IBM_454C_PRODUCT_ID) },
 187 };
 188
 189 static struct usb_device_id ti_id_table_5052[5+TI_EXTRA_VID_PID_COUNT+1] = {
 190         { USB_DEVICE(TI_VENDOR_ID, TI_5052_BOOT_PRODUCT_ID) },
 191         { USB_DEVICE(TI_VENDOR_ID, TI_5152_BOOT_PRODUCT_ID) },
 192         { USB_DEVICE(TI_VENDOR_ID, TI_5052_EEPROM_PRODUCT_ID) },
 193         { USB_DEVICE(TI_VENDOR_ID, TI_5052_FIRMWARE_PRODUCT_ID) },
 194         { USB_DEVICE(IBM_VENDOR_ID, IBM_4543_PRODUCT_ID) },
 195 };
 196
 197 static struct usb_device_id ti_id_table_combined[14+2*TI_EXTRA_VID_PID_COUNT+1] = {
 198         { USB_DEVICE(TI_VENDOR_ID, TI_3410_PRODUCT_ID) },
 199         { USB_DEVICE(TI_VENDOR_ID, TI_3410_EZ430_ID) },
 200         { USB_DEVICE(MTS_VENDOR_ID, MTS_GSM_NO_FW_PRODUCT_ID) },
 201         { USB_DEVICE(MTS_VENDOR_ID, MTS_CDMA_NO_FW_PRODUCT_ID) },
 202         { USB_DEVICE(MTS_VENDOR_ID, MTS_CDMA_PRODUCT_ID) },
 203         { USB_DEVICE(MTS_VENDOR_ID, MTS_GSM_PRODUCT_ID) },
 204         { USB_DEVICE(MTS_VENDOR_ID, MTS_EDGE_PRODUCT_ID) },
 205         { USB_DEVICE(TI_VENDOR_ID, TI_5052_BOOT_PRODUCT_ID) },
 206         { USB_DEVICE(TI_VENDOR_ID, TI_5152_BOOT_PRODUCT_ID) },
 207         { USB_DEVICE(TI_VENDOR_ID, TI_5052_EEPROM_PRODUCT_ID) },
 208         { USB_DEVICE(TI_VENDOR_ID, TI_5052_FIRMWARE_PRODUCT_ID) },
 209         { USB_DEVICE(IBM_VENDOR_ID, IBM_4543_PRODUCT_ID) },
 210         { USB_DEVICE(IBM_VENDOR_ID, IBM_454B_PRODUCT_ID) },
 211         { USB_DEVICE(IBM_VENDOR_ID, IBM_454C_PRODUCT_ID) },
 212         { }
 213 };
 214
 215 static struct usb_driver ti_usb_driver = {
 216         .name                   = "ti_usb_3410_5052",
 217         .probe                  = usb_serial_probe,
 218         .disconnect             = usb_serial_disconnect,
 219         .id_table               = ti_id_table_combined,
 220         .no_dynamic_id =        1,
 221 };
 222
 223 static struct usb_serial_driver ti_1port_device = {
 224         .driver = {
 225                 .owner          = THIS_MODULE,
 226                 .name           = "ti_usb_3410_5052_1",
 227         },
 228         .description            = "TI USB 3410 1 port adapter",
 229         .usb_driver             = &ti_usb_driver,
 230         .id_table               = ti_id_table_3410,
 231         .num_ports              = 1,
 232         .attach                 = ti_startup,
 233         .shutdown               = ti_shutdown,
 234         .open                   = ti_open,
 235         .close                  = ti_close,
 236         .write                  = ti_write,
 237         .write_room             = ti_write_room,
 238         .chars_in_buffer        = ti_chars_in_buffer,
 239         .throttle               = ti_throttle,
 240         .unthrottle             = ti_unthrottle,
 241         .ioctl                  = ti_ioctl,
 242         .set_termios            = ti_set_termios,
 243         .tiocmget               = ti_tiocmget,
 244         .tiocmset               = ti_tiocmset,
 245         .break_ctl              = ti_break,
 246         .read_int_callback      = ti_interrupt_callback,
 247         .read_bulk_callback     = ti_bulk_in_callback,
 248         .write_bulk_callback    = ti_bulk_out_callback,
 249 };
 250
 251 static struct usb_serial_driver ti_2port_device = {
 252         .driver = {
 253                 .owner          = THIS_MODULE,
 254                 .name           = "ti_usb_3410_5052_2",
 255         },
 256         .description            = "TI USB 5052 2 port adapter",
 257         .usb_driver             = &ti_usb_driver,
 258         .id_table               = ti_id_table_5052,
 259         .num_ports              = 2,
 260         .attach                 = ti_startup,
 261         .shutdown               = ti_shutdown,
 262         .open                   = ti_open,
 263         .close                  = ti_close,
 264         .write                  = ti_write,
 265         .write_room             = ti_write_room,
 266         .chars_in_buffer        = ti_chars_in_buffer,
 267         .throttle               = ti_throttle,
 268         .unthrottle             = ti_unthrottle,
 269         .ioctl                  = ti_ioctl,
 270         .set_termios            = ti_set_termios,
 271         .tiocmget               = ti_tiocmget,
 272         .tiocmset               = ti_tiocmset,
 273         .break_ctl              = ti_break,
 274         .read_int_callback      = ti_interrupt_callback,
 275         .read_bulk_callback     = ti_bulk_in_callback,
 276         .write_bulk_callback    = ti_bulk_out_callback,
 277 };
 278
 279
 280 /* Module */
 281
 282 MODULE_AUTHOR(TI_DRIVER_AUTHOR);
 283 MODULE_DESCRIPTION(TI_DRIVER_DESC);
 284 MODULE_VERSION(TI_DRIVER_VERSION);
 285 MODULE_LICENSE("GPL");
 286
 287 MODULE_FIRMWARE("ti_3410.fw");
 288 MODULE_FIRMWARE("ti_5052.fw");
 289 MODULE_FIRMWARE("mts_cdma.fw");
 290 MODULE_FIRMWARE("mts_gsm.fw");
 291 MODULE_FIRMWARE("mts_edge.fw");
 292
 293 module_param(debug, bool, S_IRUGO | S_IWUSR);
 294 MODULE_PARM_DESC(debug, "Enable debugging, 0=no, 1=yes");
 295
 296 module_param(closing_wait, int, S_IRUGO | S_IWUSR);
 297 MODULE_PARM_DESC(closing_wait,
 298     "Maximum wait for data to drain in close, in .01 secs, default is 4000");
 299
 300 module_param_array(vendor_3410, ushort, &vendor_3410_count, S_IRUGO);
 301 MODULE_PARM_DESC(vendor_3410,
 302                 "Vendor ids for 3410 based devices, 1-5 short integers");
 303 module_param_array(product_3410, ushort, &product_3410_count, S_IRUGO);
 304 MODULE_PARM_DESC(product_3410,
 305                 "Product ids for 3410 based devices, 1-5 short integers");
 306 module_param_array(vendor_5052, ushort, &vendor_5052_count, S_IRUGO);
 307 MODULE_PARM_DESC(vendor_5052,
 308                 "Vendor ids for 5052 based devices, 1-5 short integers");
 309 module_param_array(product_5052, ushort, &product_5052_count, S_IRUGO);
 310 MODULE_PARM_DESC(product_5052,
 311                 "Product ids for 5052 based devices, 1-5 short integers");
 312
 313 MODULE_DEVICE_TABLE(usb, ti_id_table_combined);
 314
 315
 316 /* Functions */
 317
 318 static int __init ti_init(void)
 319 {
 320         int i, j, c;
 321         int ret;
 322
 323         /* insert extra vendor and product ids */
 324         c = ARRAY_SIZE(ti_id_table_combined) - 2 * TI_EXTRA_VID_PID_COUNT - 1;
 325         j = ARRAY_SIZE(ti_id_table_3410) - TI_EXTRA_VID_PID_COUNT - 1;
 326         for (i = 0; i < min(vendor_3410_count, product_3410_count); i++, j++, c++) {
 327                 ti_id_table_3410[j].idVendor = vendor_3410[i];
 328                 ti_id_table_3410[j].idProduct = product_3410[i];
 329                 ti_id_table_3410[j].match_flags = USB_DEVICE_ID_MATCH_DEVICE;
 330                 ti_id_table_combined[c].idVendor = vendor_3410[i];
 331                 ti_id_table_combined[c].idProduct = product_3410[i];
 332                 ti_id_table_combined[c].match_flags = USB_DEVICE_ID_MATCH_DEVICE;
 333         }
 334         j = ARRAY_SIZE(ti_id_table_5052) - TI_EXTRA_VID_PID_COUNT - 1;
 335         for (i = 0; i < min(vendor_5052_count, product_5052_count); i++, j++, c++) {
 336                 ti_id_table_5052[j].idVendor = vendor_5052[i];
 337                 ti_id_table_5052[j].idProduct = product_5052[i];
 338                 ti_id_table_5052[j].match_flags = USB_DEVICE_ID_MATCH_DEVICE;
 339                 ti_id_table_combined[c].idVendor = vendor_5052[i];
 340                 ti_id_table_combined[c].idProduct = product_5052[i];
 341                 ti_id_table_combined[c].match_flags = USB_DEVICE_ID_MATCH_DEVICE;
 342         }
 343
 344         ret = usb_serial_register(&ti_1port_device);
 345         if (ret)
 346                 goto failed_1port;
 347         ret = usb_serial_register(&ti_2port_device);
 348         if (ret)
 349                 goto failed_2port;
 350
 351         ret = usb_register(&ti_usb_driver);
 352         if (ret)
 353                 goto failed_usb;
 354
 355         printk(KERN_INFO KBUILD_MODNAME ": " TI_DRIVER_VERSION ":"
 356                TI_DRIVER_DESC "\n");
 357
 358         return 0;
 359
 360 failed_usb:
 361         usb_serial_deregister(&ti_2port_device);
 362 failed_2port:
 363         usb_serial_deregister(&ti_1port_device);
 364 failed_1port:
 365         return ret;
 366 }
 367
 368
 369 static void __exit ti_exit(void)
 370 {
 371         usb_serial_deregister(&ti_1port_device);
 372         usb_serial_deregister(&ti_2port_device);
 373         usb_deregister(&ti_usb_driver);
 374 }
 375
 376
 377 module_init(ti_init);
 378 module_exit(ti_exit);
 379
 380
 381 static int ti_startup(struct usb_serial *serial)
 382 {
 383         struct ti_device *tdev;
 384         struct ti_port *tport;
 385         struct usb_device *dev = serial->dev;
 386         int status;
 387         int i;
 388
 389
 390         dbg("%s - product 0x%4X, num configurations %d, configuration value %d",
 391             __func__, le16_to_cpu(dev->descriptor.idProduct),
 392             dev->descriptor.bNumConfigurations,
 393             dev->actconfig->desc.bConfigurationValue);
 394
 395         /* create device structure */
 396         tdev = kzalloc(sizeof(struct ti_device), GFP_KERNEL);
 397         if (tdev == NULL) {
 398                 dev_err(&dev->dev, "%s - out of memory\n", __func__);
 399                 return -ENOMEM;
 400         }
 401         mutex_init(&tdev->td_open_close_lock);
 402         tdev->td_serial = serial;
 403         usb_set_serial_data(serial, tdev);
 404
 405         /* determine device type */
 406         if (usb_match_id(serial->interface, ti_id_table_3410))
 407                 tdev->td_is_3410 = 1;
 408         dbg("%s - device type is %s", __func__,
 409                                 tdev->td_is_3410 ? "3410" : "5052");
 410
 411         /* if we have only 1 configuration, download firmware */
 412         if (dev->descriptor.bNumConfigurations == 1) {
 413                 if ((status = ti_download_firmware(tdev)) != 0)
 414                         goto free_tdev;
 415
 416                 /* 3410 must be reset, 5052 resets itself */
 417                 if (tdev->td_is_3410) {
 418                         msleep_interruptible(100);
 419                         usb_reset_device(dev);
 420                 }
 421
 422                 status = -ENODEV;
 423                 goto free_tdev;
 424         }
 425
 426         /* the second configuration must be set */
 427         if (dev->actconfig->desc.bConfigurationValue == TI_BOOT_CONFIG) {
 428                 status = usb_driver_set_configuration(dev, TI_ACTIVE_CONFIG);
 429                 status = status ? status : -ENODEV;
 430                 goto free_tdev;
 431         }
 432
 433         /* set up port structures */
 434         for (i = 0; i < serial->num_ports; ++i) {
 435                 tport = kzalloc(sizeof(struct ti_port), GFP_KERNEL);
 436                 if (tport == NULL) {
 437                         dev_err(&dev->dev, "%s - out of memory\n", __func__);
 438                         status = -ENOMEM;
 439                         goto free_tports;
 440                 }
 441                 spin_lock_init(&tport->tp_lock);
 442                 tport->tp_uart_base_addr = (i == 0 ?
 443                                 TI_UART1_BASE_ADDR : TI_UART2_BASE_ADDR);
 444                 tport->tp_closing_wait = closing_wait;
 445                 init_waitqueue_head(&tport->tp_msr_wait);
 446                 init_waitqueue_head(&tport->tp_write_wait);
 447                 tport->tp_write_buf = ti_buf_alloc();
 448                 if (tport->tp_write_buf == NULL) {
 449                         dev_err(&dev->dev, "%s - out of memory\n", __func__);
 450                         kfree(tport);
 451                         status = -ENOMEM;
 452                         goto free_tports;
 453                 }
 454                 tport->tp_port = serial->port[i];
 455                 tport->tp_tdev = tdev;
 456                 usb_set_serial_port_data(serial->port[i], tport);
 457                 tport->tp_uart_mode = 0;        /* default is RS232 */
 458         }
 459
 460         return 0;
 461
 462 free_tports:
 463         for (--i; i >= 0; --i) {
 464                 tport = usb_get_serial_port_data(serial->port[i]);
 465                 ti_buf_free(tport->tp_write_buf);
 466                 kfree(tport);
 467                 usb_set_serial_port_data(serial->port[i], NULL);
 468         }
 469 free_tdev:
 470         kfree(tdev);
 471         usb_set_serial_data(serial, NULL);
 472         return status;
 473 }
 474
 475
 476 static void ti_shutdown(struct usb_serial *serial)
 477 {
 478         int i;
 479         struct ti_device *tdev = usb_get_serial_data(serial);
 480         struct ti_port *tport;
 481
 482         dbg("%s", __func__);
 483
 484         for (i = 0; i < serial->num_ports; ++i) {
 485                 tport = usb_get_serial_port_data(serial->port[i]);
 486                 if (tport) {
 487                         ti_buf_free(tport->tp_write_buf);
 488                         kfree(tport);
 489                         usb_set_serial_port_data(serial->port[i], NULL);
 490                 }
 491         }
 492
 493         kfree(tdev);
 494         usb_set_serial_data(serial, NULL);
 495 }
 496
 497
 498 static int ti_open(struct tty_struct *tty,
 499                         struct usb_serial_port *port, struct file *file)
 500 {
 501         struct ti_port *tport = usb_get_serial_port_data(port);
 502         struct ti_device *tdev;
 503         struct usb_device *dev;
 504         struct urb *urb;
 505         int port_number;
 506         int status;
 507         __u16 open_settings = (__u8)(TI_PIPE_MODE_CONTINOUS |
 508                              TI_PIPE_TIMEOUT_ENABLE |
 509                              (TI_TRANSFER_TIMEOUT << 2));
 510
 511         dbg("%s - port %d", __func__, port->number);
 512
 513         if (tport == NULL)
 514                 return -ENODEV;
 515
 516         dev = port->serial->dev;
 517         tdev = tport->tp_tdev;
 518
 519         /* only one open on any port on a device at a time */
 520         if (mutex_lock_interruptible(&tdev->td_open_close_lock))
 521                 return -ERESTARTSYS;
 522
 523         port_number = port->number - port->serial->minor;
 524
 525         memset(&(tport->tp_icount), 0x00, sizeof(tport->tp_icount));
 526
 527         tport->tp_msr = 0;
 528         tport->tp_shadow_mcr |= (TI_MCR_RTS | TI_MCR_DTR);
 529
 530         /* start interrupt urb the first time a port is opened on this device */
 531         if (tdev->td_open_port_count == 0) {
 532                 dbg("%s - start interrupt in urb", __func__);
 533                 urb = tdev->td_serial->port[0]->interrupt_in_urb;
 534                 if (!urb) {
 535                         dev_err(&port->dev, "%s - no interrupt urb\n",
 536                                                                 __func__);
 537                         status = -EINVAL;
 538                         goto release_lock;
 539                 }
 540                 urb->complete = ti_interrupt_callback;
 541                 urb->context = tdev;
 542                 urb->dev = dev;
 543                 status = usb_submit_urb(urb, GFP_KERNEL);
 544                 if (status) {
 545                         dev_err(&port->dev,
 546                                 "%s - submit interrupt urb failed, %d\n",
 547                                         __func__, status);
 548                         goto release_lock;
 549                 }
 550         }
 551
 552         if (tty)
 553                 ti_set_termios(tty, port, tty->termios);
 554
 555         dbg("%s - sending TI_OPEN_PORT", __func__);
 556         status = ti_command_out_sync(tdev, TI_OPEN_PORT,
 557                 (__u8)(TI_UART1_PORT + port_number), open_settings, NULL, 0);
 558         if (status) {
 559                 dev_err(&port->dev, "%s - cannot send open command, %d\n",
 560                                                         __func__, status);
 561                 goto unlink_int_urb;
 562         }
 563
 564         dbg("%s - sending TI_START_PORT", __func__);
 565         status = ti_command_out_sync(tdev, TI_START_PORT,
 566                 (__u8)(TI_UART1_PORT + port_number), 0, NULL, 0);
 567         if (status) {
 568                 dev_err(&port->dev, "%s - cannot send start command, %d\n",
 569                                                         __func__, status);
 570                 goto unlink_int_urb;
 571         }
 572
 573         dbg("%s - sending TI_PURGE_PORT", __func__);
 574         status = ti_command_out_sync(tdev, TI_PURGE_PORT,
 575                 (__u8)(TI_UART1_PORT + port_number), TI_PURGE_INPUT, NULL, 0);
 576         if (status) {
 577                 dev_err(&port->dev, "%s - cannot clear input buffers, %d\n",
 578                                                         __func__, status);
 579                 goto unlink_int_urb;
 580         }
 581         status = ti_command_out_sync(tdev, TI_PURGE_PORT,
 582                 (__u8)(TI_UART1_PORT + port_number), TI_PURGE_OUTPUT, NULL, 0);
 583         if (status) {
 584                 dev_err(&port->dev, "%s - cannot clear output buffers, %d\n",
 585                                                         __func__, status);
 586                 goto unlink_int_urb;
 587         }
 588
 589         /* reset the data toggle on the bulk endpoints to work around bug in
 590          * host controllers where things get out of sync some times */
 591         usb_clear_halt(dev, port->write_urb->pipe);
 592         usb_clear_halt(dev, port->read_urb->pipe);
 593
 594         if (tty)
 595                 ti_set_termios(tty, port, tty->termios);
 596
 597         dbg("%s - sending TI_OPEN_PORT (2)", __func__);
 598         status = ti_command_out_sync(tdev, TI_OPEN_PORT,
 599                 (__u8)(TI_UART1_PORT + port_number), open_settings, NULL, 0);
 600         if (status) {
 601                 dev_err(&port->dev, "%s - cannot send open command (2), %d\n",
 602                                                         __func__, status);
 603                 goto unlink_int_urb;
 604         }
 605
 606         dbg("%s - sending TI_START_PORT (2)", __func__);
 607         status = ti_command_out_sync(tdev, TI_START_PORT,
 608                 (__u8)(TI_UART1_PORT + port_number), 0, NULL, 0);
 609         if (status) {
 610                 dev_err(&port->dev, "%s - cannot send start command (2), %d\n",
 611                                                         __func__, status);
 612                 goto unlink_int_urb;
 613         }
 614
 615         /* start read urb */
 616         dbg("%s - start read urb", __func__);
 617         urb = port->read_urb;
 618         if (!urb) {
 619                 dev_err(&port->dev, "%s - no read urb\n", __func__);
 620                 status = -EINVAL;
 621                 goto unlink_int_urb;
 622         }
 623         tport->tp_read_urb_state = TI_READ_URB_RUNNING;
 624         urb->complete = ti_bulk_in_callback;
 625         urb->context = tport;
 626         urb->dev = dev;
 627         status = usb_submit_urb(urb, GFP_KERNEL);
 628         if (status) {
 629                 dev_err(&port->dev, "%s - submit read urb failed, %d\n",
 630                                                         __func__, status);
 631                 goto unlink_int_urb;
 632         }
 633
 634         tport->tp_is_open = 1;
 635         ++tdev->td_open_port_count;
 636
 637         goto release_lock;
 638
 639 unlink_int_urb:
 640         if (tdev->td_open_port_count == 0)
 641                 usb_kill_urb(port->serial->port[0]->interrupt_in_urb);
 642 release_lock:
 643         mutex_unlock(&tdev->td_open_close_lock);
 644         dbg("%s - exit %d", __func__, status);
 645         return status;
 646 }
 647
 648
 649 static void ti_close(struct usb_serial_port *port)
 650 {
 651         struct ti_device *tdev;
 652         struct ti_port *tport;
 653         int port_number;
 654         int status;
 655         int do_unlock;
 656
 657         dbg("%s - port %d", __func__, port->number);
 658
 659         tdev = usb_get_serial_data(port->serial);
 660         tport = usb_get_serial_port_data(port);
 661         if (tdev == NULL || tport == NULL)
 662                 return;
 663
 664         tport->tp_is_open = 0;
 665
 666         ti_drain(tport, (tport->tp_closing_wait*HZ)/100, 1);
 667
 668         usb_kill_urb(port->read_urb);
 669         usb_kill_urb(port->write_urb);
 670         tport->tp_write_urb_in_use = 0;
 671
 672         port_number = port->number - port->serial->minor;
 673
 674         dbg("%s - sending TI_CLOSE_PORT", __func__);
 675         status = ti_command_out_sync(tdev, TI_CLOSE_PORT,
 676                      (__u8)(TI_UART1_PORT + port_number), 0, NULL, 0);
 677         if (status)
 678                 dev_err(&port->dev,
 679                         "%s - cannot send close port command, %d\n"
 680                                                         , __func__, status);
 681
 682         /* if mutex_lock is interrupted, continue anyway */
 683         do_unlock = !mutex_lock_interruptible(&tdev->td_open_close_lock);
 684         --tport->tp_tdev->td_open_port_count;
 685         if (tport->tp_tdev->td_open_port_count <= 0) {
 686                 /* last port is closed, shut down interrupt urb */
 687                 usb_kill_urb(port->serial->port[0]->interrupt_in_urb);
 688                 tport->tp_tdev->td_open_port_count = 0;
 689         }
 690         if (do_unlock)
 691                 mutex_unlock(&tdev->td_open_close_lock);
 692
 693         dbg("%s - exit", __func__);
 694 }
 695
 696
 697 static int ti_write(struct tty_struct *tty, struct usb_serial_port *port,
 698                         const unsigned char *data, int count)
 699 {
 700         struct ti_port *tport = usb_get_serial_port_data(port);
 701         unsigned long flags;
 702
 703         dbg("%s - port %d", __func__, port->number);
 704
 705         if (count == 0) {
 706                 dbg("%s - write request of 0 bytes", __func__);
 707                 return 0;
 708         }
 709
 710         if (tport == NULL || !tport->tp_is_open)
 711                 return -ENODEV;
 712
 713         spin_lock_irqsave(&tport->tp_lock, flags);
 714         count = ti_buf_put(tport->tp_write_buf, data, count);
 715         spin_unlock_irqrestore(&tport->tp_lock, flags);
 716
 717         ti_send(tport);
 718
 719         return count;
 720 }
 721
 722
 723 static int ti_write_room(struct tty_struct *tty)
 724 {
 725         struct usb_serial_port *port = tty->driver_data;
 726         struct ti_port *tport = usb_get_serial_port_data(port);
 727         int room = 0;
 728         unsigned long flags;
 729
 730         dbg("%s - port %d", __func__, port->number);
 731
 732         if (tport == NULL)
 733                 return -ENODEV;
 734
 735         spin_lock_irqsave(&tport->tp_lock, flags);
 736         room = ti_buf_space_avail(tport->tp_write_buf);
 737         spin_unlock_irqrestore(&tport->tp_lock, flags);
 738
 739         dbg("%s - returns %d", __func__, room);
 740         return room;
 741 }
 742
 743
 744 static int ti_chars_in_buffer(struct tty_struct *tty)
 745 {
 746         struct usb_serial_port *port = tty->driver_data;
 747         struct ti_port *tport = usb_get_serial_port_data(port);
 748         int chars = 0;
 749         unsigned long flags;
 750
 751         dbg("%s - port %d", __func__, port->number);
 752
 753         if (tport == NULL)
 754                 return -ENODEV;
 755
 756         spin_lock_irqsave(&tport->tp_lock, flags);
 757         chars = ti_buf_data_avail(tport->tp_write_buf);
 758         spin_unlock_irqrestore(&tport->tp_lock, flags);
 759
 760         dbg("%s - returns %d", __func__, chars);
 761         return chars;
 762 }
 763
 764
 765 static void ti_throttle(struct tty_struct *tty)
 766 {
 767         struct usb_serial_port *port = tty->driver_data;
 768         struct ti_port *tport = usb_get_serial_port_data(port);
 769
 770         dbg("%s - port %d", __func__, port->number);
 771
 772         if (tport == NULL)
 773                 return;
 774
 775         if (I_IXOFF(tty) || C_CRTSCTS(tty))
 776                 ti_stop_read(tport, tty);
 777
 778 }
 779
 780
 781 static void ti_unthrottle(struct tty_struct *tty)
 782 {
 783         struct usb_serial_port *port = tty->driver_data;
 784         struct ti_port *tport = usb_get_serial_port_data(port);
 785         int status;
 786
 787         dbg("%s - port %d", __func__, port->number);
 788
 789         if (tport == NULL)
 790                 return;
 791
 792         if (I_IXOFF(tty) || C_CRTSCTS(tty)) {
 793                 status = ti_restart_read(tport, tty);
 794                 if (status)
 795                         dev_err(&port->dev, "%s - cannot restart read, %d\n",
 796                                                         __func__, status);
 797         }
 798 }
 799
 800
 801 static int ti_ioctl(struct tty_struct *tty, struct file *file,
 802         unsigned int cmd, unsigned long arg)
 803 {
 804         struct usb_serial_port *port = tty->driver_data;
 805         struct ti_port *tport = usb_get_serial_port_data(port);
 806         struct async_icount cnow;
 807         struct async_icount cprev;
 808
 809         dbg("%s - port %d, cmd = 0x%04X", __func__, port->number, cmd);
 810
 811         if (tport == NULL)
 812                 return -ENODEV;
 813
 814         switch (cmd) {
 815         case TIOCGSERIAL:
 816                 dbg("%s - (%d) TIOCGSERIAL", __func__, port->number);
 817                 return ti_get_serial_info(tport,
 818                                 (struct serial_struct __user *)arg);
 819         case TIOCSSERIAL:
 820                 dbg("%s - (%d) TIOCSSERIAL", __func__, port->number);
 821                 return ti_set_serial_info(tty, tport,
 822                                 (struct serial_struct __user *)arg);
 823         case TIOCMIWAIT:
 824                 dbg("%s - (%d) TIOCMIWAIT", __func__, port->number);
 825                 cprev = tport->tp_icount;
 826                 while (1) {
 827                         interruptible_sleep_on(&tport->tp_msr_wait);
 828                         if (signal_pending(current))
 829                                 return -ERESTARTSYS;
 830                         cnow = tport->tp_icount;
 831                         if (cnow.rng == cprev.rng && cnow.dsr == cprev.dsr &&
 832                             cnow.dcd == cprev.dcd && cnow.cts == cprev.cts)
 833                                 return -EIO; /* no change => error */
 834                         if (((arg & TIOCM_RNG) && (cnow.rng != cprev.rng)) ||
 835                             ((arg & TIOCM_DSR) && (cnow.dsr != cprev.dsr)) ||
 836                             ((arg & TIOCM_CD)  && (cnow.dcd != cprev.dcd)) ||
 837                             ((arg & TIOCM_CTS) && (cnow.cts != cprev.cts)))
 838                                 return 0;
 839                         cprev = cnow;
 840                 }
 841                 break;
 842         case TIOCGICOUNT:
 843                 dbg("%s - (%d) TIOCGICOUNT RX=%d, TX=%d",
 844                                 __func__, port->number,
 845                                 tport->tp_icount.rx, tport->tp_icount.tx);
 846                 if (copy_to_user((void __user *)arg, &tport->tp_icount,
 847                                         sizeof(tport->tp_icount)))
 848                         return -EFAULT;
 849                 return 0;
 850         }
 851         return -ENOIOCTLCMD;
 852 }
 853
 854
 855 static void ti_set_termios(struct tty_struct *tty,
 856                 struct usb_serial_port *port, struct ktermios *old_termios)
 857 {
 858         struct ti_port *tport = usb_get_serial_port_data(port);
 859         struct ti_uart_config *config;
 860         tcflag_t cflag, iflag;
 861         int baud;
 862         int status;
 863         int port_number = port->number - port->serial->minor;
 864         unsigned int mcr;
 865
 866         dbg("%s - port %d", __func__, port->number);
 867
 868         cflag = tty->termios->c_cflag;
 869         iflag = tty->termios->c_iflag;
 870
 871         dbg("%s - cflag %08x, iflag %08x", __func__, cflag, iflag);
 872         dbg("%s - old clfag %08x, old iflag %08x", __func__,
 873                                 old_termios->c_cflag, old_termios->c_iflag);
 874
 875         if (tport == NULL)
 876                 return;
 877
 878         config = kmalloc(sizeof(*config), GFP_KERNEL);
 879         if (!config) {
 880                 dev_err(&port->dev, "%s - out of memory\n", __func__);
 881                 return;
 882         }
 883
 884         config->wFlags = 0;
 885
 886         /* these flags must be set */
 887         config->wFlags |= TI_UART_ENABLE_MS_INTS;
 888         config->wFlags |= TI_UART_ENABLE_AUTO_START_DMA;
 889         config->bUartMode = (__u8)(tport->tp_uart_mode);
 890
 891         switch (cflag & CSIZE) {
 892         case CS5:
 893                     config->bDataBits = TI_UART_5_DATA_BITS;
 894                     break;
 895         case CS6:
 896                     config->bDataBits = TI_UART_6_DATA_BITS;
 897                     break;
 898         case CS7:
 899                     config->bDataBits = TI_UART_7_DATA_BITS;
 900                     break;
 901         default:
 902         case CS8:
 903                     config->bDataBits = TI_UART_8_DATA_BITS;
 904                     break;
 905         }
 906
 907         /* CMSPAR isn't supported by this driver */
 908         tty->termios->c_cflag &= ~CMSPAR;
 909
 910         if (cflag & PARENB) {
 911                 if (cflag & PARODD) {
 912                         config->wFlags |= TI_UART_ENABLE_PARITY_CHECKING;
 913                         config->bParity = TI_UART_ODD_PARITY;
 914                 } else {
 915                         config->wFlags |= TI_UART_ENABLE_PARITY_CHECKING;
 916                         config->bParity = TI_UART_EVEN_PARITY;
 917                 }
 918         } else {
 919                 config->wFlags &= ~TI_UART_ENABLE_PARITY_CHECKING;
 920                 config->bParity = TI_UART_NO_PARITY;
 921         }
 922
 923         if (cflag & CSTOPB)
 924                 config->bStopBits = TI_UART_2_STOP_BITS;
 925         else
 926                 config->bStopBits = TI_UART_1_STOP_BITS;
 927
 928         if (cflag & CRTSCTS) {
 929                 /* RTS flow control must be off to drop RTS for baud rate B0 */
 930                 if ((cflag & CBAUD) != B0)
 931                         config->wFlags |= TI_UART_ENABLE_RTS_IN;
 932                 config->wFlags |= TI_UART_ENABLE_CTS_OUT;
 933         } else {
 934                 tty->hw_stopped = 0;
 935                 ti_restart_read(tport, tty);
 936         }
 937
 938         if (I_IXOFF(tty) || I_IXON(tty)) {
 939                 config->cXon  = START_CHAR(tty);
 940                 config->cXoff = STOP_CHAR(tty);
 941
 942                 if (I_IXOFF(tty))
 943                         config->wFlags |= TI_UART_ENABLE_X_IN;
 944                 else
 945                         ti_restart_read(tport, tty);
 946
 947                 if (I_IXON(tty))
 948                         config->wFlags |= TI_UART_ENABLE_X_OUT;
 949         }
 950
 951         baud = tty_get_baud_rate(tty);
 952         if (!baud)
 953                 baud = 9600;
 954         if (tport->tp_tdev->td_is_3410)
 955                 config->wBaudRate = (__u16)((923077 + baud/2) / baud);
 956         else
 957                 config->wBaudRate = (__u16)((461538 + baud/2) / baud);
 958
 959         /* FIXME: Should calculate resulting baud here and report it back */
 960         if ((cflag & CBAUD) != B0)
 961                 tty_encode_baud_rate(tty, baud, baud);
 962
 963         dbg("%s - BaudRate=%d, wBaudRate=%d, wFlags=0x%04X, bDataBits=%d, bParity=%d, bStopBits=%d, cXon=%d, cXoff=%d, bUartMode=%d",
 964         __func__, baud, config->wBaudRate, config->wFlags, config->bDataBits, config->bParity, config->bStopBits, config->cXon, config->cXoff, config->bUartMode);
 965
 966         cpu_to_be16s(&config->wBaudRate);
 967         cpu_to_be16s(&config->wFlags);
 968
 969         status = ti_command_out_sync(tport->tp_tdev, TI_SET_CONFIG,
 970                 (__u8)(TI_UART1_PORT + port_number), 0, (__u8 *)config,
 971                 sizeof(*config));
 972         if (status)
 973                 dev_err(&port->dev, "%s - cannot set config on port %d, %d\n",
 974                                         __func__, port_number, status);
 975
 976         /* SET_CONFIG asserts RTS and DTR, reset them correctly */
 977         mcr = tport->tp_shadow_mcr;
 978         /* if baud rate is B0, clear RTS and DTR */
 979         if ((cflag & CBAUD) == B0)
 980                 mcr &= ~(TI_MCR_DTR | TI_MCR_RTS);
 981         status = ti_set_mcr(tport, mcr);
 982         if (status)
 983                 dev_err(&port->dev,
 984                         "%s - cannot set modem control on port %d, %d\n",
 985                                                 __func__, port_number, status);
 986
 987         kfree(config);
 988 }
 989
 990
 991 static int ti_tiocmget(struct tty_struct *tty, struct file *file)
 992 {
 993         struct usb_serial_port *port = tty->driver_data;
 994         struct ti_port *tport = usb_get_serial_port_data(port);
 995         unsigned int result;
 996         unsigned int msr;
 997         unsigned int mcr;
 998         unsigned long flags;
 999
1000         dbg("%s - port %d", __func__, port->number);
1001
1002         if (tport == NULL)
1003                 return -ENODEV;
1004
1005         spin_lock_irqsave(&tport->tp_lock, flags);
1006         msr = tport->tp_msr;
1007         mcr = tport->tp_shadow_mcr;
1008         spin_unlock_irqrestore(&tport->tp_lock, flags);
1009
1010         result = ((mcr & TI_MCR_DTR) ? TIOCM_DTR : 0)
1011                 | ((mcr & TI_MCR_RTS) ? TIOCM_RTS : 0)
1012                 | ((mcr & TI_MCR_LOOP) ? TIOCM_LOOP : 0)
1013                 | ((msr & TI_MSR_CTS) ? TIOCM_CTS : 0)
1014                 | ((msr & TI_MSR_CD) ? TIOCM_CAR : 0)
1015                 | ((msr & TI_MSR_RI) ? TIOCM_RI : 0)
1016                 | ((msr & TI_MSR_DSR) ? TIOCM_DSR : 0);
1017
1018         dbg("%s - 0x%04X", __func__, result);
1019
1020         return result;
1021 }
1022
1023
1024 static int ti_tiocmset(struct tty_struct *tty, struct file *file,
1025         unsigned int set, unsigned int clear)
1026 {
1027         struct usb_serial_port *port = tty->driver_data;
1028         struct ti_port *tport = usb_get_serial_port_data(port);
1029         unsigned int mcr;
1030         unsigned long flags;
1031
1032         dbg("%s - port %d", __func__, port->number);
1033
1034         if (tport == NULL)
1035                 return -ENODEV;
1036
1037         spin_lock_irqsave(&tport->tp_lock, flags);
1038         mcr = tport->tp_shadow_mcr;
1039
1040         if (set & TIOCM_RTS)
1041                 mcr |= TI_MCR_RTS;
1042         if (set & TIOCM_DTR)
1043                 mcr |= TI_MCR_DTR;
1044         if (set & TIOCM_LOOP)
1045                 mcr |= TI_MCR_LOOP;
1046
1047         if (clear & TIOCM_RTS)
1048                 mcr &= ~TI_MCR_RTS;
1049         if (clear & TIOCM_DTR)
1050                 mcr &= ~TI_MCR_DTR;
1051         if (clear & TIOCM_LOOP)
1052                 mcr &= ~TI_MCR_LOOP;
1053         spin_unlock_irqrestore(&tport->tp_lock, flags);
1054
1055         return ti_set_mcr(tport, mcr);
1056 }
1057
1058
1059 static void ti_break(struct tty_struct *tty, int break_state)
1060 {
1061         struct usb_serial_port *port = tty->driver_data;
1062         struct ti_port *tport = usb_get_serial_port_data(port);
1063         int status;
1064
1065         dbg("%s - state = %d", __func__, break_state);
1066
1067         if (tport == NULL)
1068                 return;
1069
1070         ti_drain(tport, (tport->tp_closing_wait*HZ)/100, 0);
1071
1072         status = ti_write_byte(tport->tp_tdev,
1073                 tport->tp_uart_base_addr + TI_UART_OFFSET_LCR,
1074                 TI_LCR_BREAK, break_state == -1 ? TI_LCR_BREAK : 0);
1075
1076         if (status)
1077                 dbg("%s - error setting break, %d", __func__, status);
1078 }
1079
1080
1081 static void ti_interrupt_callback(struct urb *urb)
1082 {
1083         struct ti_device *tdev = urb->context;
1084         struct usb_serial_port *port;
1085         struct usb_serial *serial = tdev->td_serial;
1086         struct ti_port *tport;
1087         struct device *dev = &urb->dev->dev;
1088         unsigned char *data = urb->transfer_buffer;
1089         int length = urb->actual_length;
1090         int port_number;
1091         int function;
1092         int status = urb->status;
1093         int retval;
1094         __u8 msr;
1095
1096         dbg("%s", __func__);
1097
1098         switch (status) {
1099         case 0:
1100                 break;
1101         case -ECONNRESET:
1102         case -ENOENT:
1103         case -ESHUTDOWN:
1104                 dbg("%s - urb shutting down, %d", __func__, status);
1105                 tdev->td_urb_error = 1;
1106                 return;
1107         default:
1108                 dev_err(dev, "%s - nonzero urb status, %d\n",
1109                         __func__, status);
1110                 tdev->td_urb_error = 1;
1111                 goto exit;
1112         }
1113
1114         if (length != 2) {
1115                 dbg("%s - bad packet size, %d", __func__, length);
1116                 goto exit;
1117         }
1118
1119         if (data[0] == TI_CODE_HARDWARE_ERROR) {
1120                 dev_err(dev, "%s - hardware error, %d\n", __func__, data[1]);
1121                 goto exit;
1122         }
1123
1124         port_number = TI_GET_PORT_FROM_CODE(data[0]);
1125         function = TI_GET_FUNC_FROM_CODE(data[0]);
1126
1127         dbg("%s - port_number %d, function %d, data 0x%02X",
1128                                 __func__, port_number, function, data[1]);
1129
1130         if (port_number >= serial->num_ports) {
1131                 dev_err(dev, "%s - bad port number, %d\n",
1132                                                 __func__, port_number);
1133                 goto exit;
1134         }
1135
1136         port = serial->port[port_number];
1137
1138         tport = usb_get_serial_port_data(port);
1139         if (!tport)
1140                 goto exit;
1141
1142         switch (function) {
1143         case TI_CODE_DATA_ERROR:
1144                 dev_err(dev, "%s - DATA ERROR, port %d, data 0x%02X\n",
1145                                         __func__, port_number, data[1]);
1146                 break;
1147
1148         case TI_CODE_MODEM_STATUS:
1149                 msr = data[1];
1150                 dbg("%s - port %d, msr 0x%02X", __func__, port_number, msr);
1151                 ti_handle_new_msr(tport, msr);
1152                 break;
1153
1154         default:
1155                 dev_err(dev, "%s - unknown interrupt code, 0x%02X\n",
1156                                                         __func__, data[1]);
1157                 break;
1158         }
1159
1160 exit:
1161         retval = usb_submit_urb(urb, GFP_ATOMIC);
1162         if (retval)
1163                 dev_err(dev, "%s - resubmit interrupt urb failed, %d\n",
1164                         __func__, retval);
1165 }
1166
1167
1168 static void ti_bulk_in_callback(struct urb *urb)
1169 {
1170         struct ti_port *tport = urb->context;
1171         struct usb_serial_port *port = tport->tp_port;
1172         struct device *dev = &urb->dev->dev;
1173         int status = urb->status;
1174         int retval = 0;
1175         struct tty_struct *tty;
1176
1177         dbg("%s", __func__);
1178
1179         switch (status) {
1180         case 0:
1181                 break;
1182         case -ECONNRESET:
1183         case -ENOENT:
1184         case -ESHUTDOWN:
1185                 dbg("%s - urb shutting down, %d", __func__, status);
1186                 tport->tp_tdev->td_urb_error = 1;
1187                 wake_up_interruptible(&tport->tp_write_wait);
1188                 return;
1189         default:
1190                 dev_err(dev, "%s - nonzero urb status, %d\n",
1191                         __func__, status);
1192                 tport->tp_tdev->td_urb_error = 1;
1193                 wake_up_interruptible(&tport->tp_write_wait);
1194         }
1195
1196         if (status == -EPIPE)
1197                 goto exit;
1198
1199         if (status) {
1200                 dev_err(dev, "%s - stopping read!\n", __func__);
1201                 return;
1202         }
1203
1204         tty = tty_port_tty_get(&port->port);
1205         if (tty) {
1206                 if (urb->actual_length) {
1207                         usb_serial_debug_data(debug, dev, __func__,
1208                                 urb->actual_length, urb->transfer_buffer);
1209
1210                         if (!tport->tp_is_open)
1211                                 dbg("%s - port closed, dropping data",
1212                                         __func__);
1213                         else
1214                                 ti_recv(&urb->dev->dev, tty,
1215                                                 urb->transfer_buffer,
1216                                                 urb->actual_length);
1217                         spin_lock(&tport->tp_lock);
1218                         tport->tp_icount.rx += urb->actual_length;
1219                         spin_unlock(&tport->tp_lock);
1220                 }
1221                 tty_kref_put(tty);
1222         }
1223
1224 exit:
1225         /* continue to read unless stopping */
1226         spin_lock(&tport->tp_lock);
1227         if (tport->tp_read_urb_state == TI_READ_URB_RUNNING) {
1228                 urb->dev = port->serial->dev;
1229                 retval = usb_submit_urb(urb, GFP_ATOMIC);
1230         } else if (tport->tp_read_urb_state == TI_READ_URB_STOPPING) {
1231                 tport->tp_read_urb_state = TI_READ_URB_STOPPED;
1232         }
1233         spin_unlock(&tport->tp_lock);
1234         if (retval)
1235                 dev_err(dev, "%s - resubmit read urb failed, %d\n",
1236                         __func__, retval);
1237 }
1238
1239
1240 static void ti_bulk_out_callback(struct urb *urb)
1241 {
1242         struct ti_port *tport = urb->context;
1243         struct usb_serial_port *port = tport->tp_port;
1244         struct device *dev = &urb->dev->dev;
1245         int status = urb->status;
1246
1247         dbg("%s - port %d", __func__, port->number);
1248
1249         tport->tp_write_urb_in_use = 0;
1250
1251         switch (status) {
1252         case 0:
1253                 break;
1254         case -ECONNRESET:
1255         case -ENOENT:
1256         case -ESHUTDOWN:
1257                 dbg("%s - urb shutting down, %d", __func__, status);
1258                 tport->tp_tdev->td_urb_error = 1;
1259                 wake_up_interruptible(&tport->tp_write_wait);
1260                 return;
1261         default:
1262                 dev_err(dev, "%s - nonzero urb status, %d\n",
1263                         __func__, status);
1264                 tport->tp_tdev->td_urb_error = 1;
1265                 wake_up_interruptible(&tport->tp_write_wait);
1266         }
1267
1268         /* send any buffered data */
1269         ti_send(tport);
1270 }
1271
1272
1273 static void ti_recv(struct device *dev, struct tty_struct *tty,
1274         unsigned char *data, int length)
1275 {
1276         int cnt;
1277
1278         do {
1279                 cnt = tty_buffer_request_room(tty, length);
1280                 if (cnt < length) {
1281                         dev_err(dev, "%s - dropping data, %d bytes lost\n",
1282                                                 __func__, length - cnt);
1283                         if (cnt == 0)
1284                                 break;
1285                 }
1286                 tty_insert_flip_string(tty, data, cnt);
1287                 tty_flip_buffer_push(tty);
1288                 data += cnt;
1289                 length -= cnt;
1290         } while (length > 0);
1291
1292 }
1293
1294
1295 static void ti_send(struct ti_port *tport)
1296 {
1297         int count, result;
1298         struct usb_serial_port *port = tport->tp_port;
1299         struct tty_struct *tty = tty_port_tty_get(&port->port); /* FIXME */
1300         unsigned long flags;
1301
1302
1303         dbg("%s - port %d", __func__, port->number);
1304
1305         spin_lock_irqsave(&tport->tp_lock, flags);
1306
1307         if (tport->tp_write_urb_in_use)
1308                 goto unlock;
1309
1310         count = ti_buf_get(tport->tp_write_buf,
1311                                 port->write_urb->transfer_buffer,
1312                                 port->bulk_out_size);
1313
1314         if (count == 0)
1315                 goto unlock;
1316
1317         tport->tp_write_urb_in_use = 1;
1318
1319         spin_unlock_irqrestore(&tport->tp_lock, flags);
1320
1321         usb_serial_debug_data(debug, &port->dev, __func__, count,
1322                                         port->write_urb->transfer_buffer);
1323
1324         usb_fill_bulk_urb(port->write_urb, port->serial->dev,
1325                            usb_sndbulkpipe(port->serial->dev,
1326                                             port->bulk_out_endpointAddress),
1327                            port->write_urb->transfer_buffer, count,
1328                            ti_bulk_out_callback, tport);
1329
1330         result = usb_submit_urb(port->write_urb, GFP_ATOMIC);
1331         if (result) {
1332                 dev_err(&port->dev, "%s - submit write urb failed, %d\n",
1333                                                         __func__, result);
1334                 tport->tp_write_urb_in_use = 0;
1335                 /* TODO: reschedule ti_send */
1336         } else {
1337                 spin_lock_irqsave(&tport->tp_lock, flags);
1338                 tport->tp_icount.tx += count;
1339                 spin_unlock_irqrestore(&tport->tp_lock, flags);
1340         }
1341
1342         /* more room in the buffer for new writes, wakeup */
1343         if (tty)
1344                 tty_wakeup(tty);
1345         tty_kref_put(tty);
1346         wake_up_interruptible(&tport->tp_write_wait);
1347         return;
1348 unlock:
1349         spin_unlock_irqrestore(&tport->tp_lock, flags);
1350         tty_kref_put(tty);
1351         return;
1352 }
1353
1354
1355 static int ti_set_mcr(struct ti_port *tport, unsigned int mcr)
1356 {
1357         unsigned long flags;
1358         int status;
1359
1360         status = ti_write_byte(tport->tp_tdev,
1361                 tport->tp_uart_base_addr + TI_UART_OFFSET_MCR,
1362                 TI_MCR_RTS | TI_MCR_DTR | TI_MCR_LOOP, mcr);
1363
1364         spin_lock_irqsave(&tport->tp_lock, flags);
1365         if (!status)
1366                 tport->tp_shadow_mcr = mcr;
1367         spin_unlock_irqrestore(&tport->tp_lock, flags);
1368
1369         return status;
1370 }
1371
1372
1373 static int ti_get_lsr(struct ti_port *tport)
1374 {
1375         int size, status;
1376         struct ti_device *tdev = tport->tp_tdev;
1377         struct usb_serial_port *port = tport->tp_port;
1378         int port_number = port->number - port->serial->minor;
1379         struct ti_port_status *data;
1380
1381         dbg("%s - port %d", __func__, port->number);
1382
1383         size = sizeof(struct ti_port_status);
1384         data = kmalloc(size, GFP_KERNEL);
1385         if (!data) {
1386                 dev_err(&port->dev, "%s - out of memory\n", __func__);
1387                 return -ENOMEM;
1388         }
1389
1390         status = ti_command_in_sync(tdev, TI_GET_PORT_STATUS,
1391                 (__u8)(TI_UART1_PORT+port_number), 0, (__u8 *)data, size);
1392         if (status) {
1393                 dev_err(&port->dev,
1394                         "%s - get port status command failed, %d\n",
1395                                                         __func__, status);
1396                 goto free_data;
1397         }
1398
1399         dbg("%s - lsr 0x%02X", __func__, data->bLSR);
1400
1401         tport->tp_lsr = data->bLSR;
1402
1403 free_data:
1404         kfree(data);
1405         return status;
1406 }
1407
1408
1409 static int ti_get_serial_info(struct ti_port *tport,
1410         struct serial_struct __user *ret_arg)
1411 {
1412         struct usb_serial_port *port = tport->tp_port;
1413         struct serial_struct ret_serial;
1414
1415         if (!ret_arg)
1416                 return -EFAULT;
1417
1418         memset(&ret_serial, 0, sizeof(ret_serial));
1419
1420         ret_serial.type = PORT_16550A;
1421         ret_serial.line = port->serial->minor;
1422         ret_serial.port = port->number - port->serial->minor;
1423         ret_serial.flags = tport->tp_flags;
1424         ret_serial.xmit_fifo_size = TI_WRITE_BUF_SIZE;
1425         ret_serial.baud_base = tport->tp_tdev->td_is_3410 ? 921600 : 460800;
1426         ret_serial.closing_wait = tport->tp_closing_wait;
1427
1428         if (copy_to_user(ret_arg, &ret_serial, sizeof(*ret_arg)))
1429                 return -EFAULT;
1430
1431         return 0;
1432 }
1433
1434
1435 static int ti_set_serial_info(struct tty_struct *tty, struct ti_port *tport,
1436         struct serial_struct __user *new_arg)
1437 {
1438         struct serial_struct new_serial;
1439
1440         if (copy_from_user(&new_serial, new_arg, sizeof(new_serial)))
1441                 return -EFAULT;
1442
1443         tport->tp_flags = new_serial.flags & TI_SET_SERIAL_FLAGS;
1444         tport->tp_closing_wait = new_serial.closing_wait;
1445
1446         return 0;
1447 }
1448
1449
1450 static void ti_handle_new_msr(struct ti_port *tport, __u8 msr)
1451 {
1452         struct async_icount *icount;
1453         struct tty_struct *tty;
1454         unsigned long flags;
1455
1456         dbg("%s - msr 0x%02X", __func__, msr);
1457
1458         if (msr & TI_MSR_DELTA_MASK) {
1459                 spin_lock_irqsave(&tport->tp_lock, flags);
1460                 icount = &tport->tp_icount;
1461                 if (msr & TI_MSR_DELTA_CTS)
1462                         icount->cts++;
1463                 if (msr & TI_MSR_DELTA_DSR)
1464                         icount->dsr++;
1465                 if (msr & TI_MSR_DELTA_CD)
1466                         icount->dcd++;
1467                 if (msr & TI_MSR_DELTA_RI)
1468                         icount->rng++;
1469                 wake_up_interruptible(&tport->tp_msr_wait);
1470                 spin_unlock_irqrestore(&tport->tp_lock, flags);
1471         }
1472
1473         tport->tp_msr = msr & TI_MSR_MASK;
1474
1475         /* handle CTS flow control */
1476         tty = tty_port_tty_get(&tport->tp_port->port);
1477         if (tty && C_CRTSCTS(tty)) {
1478                 if (msr & TI_MSR_CTS) {
1479                         tty->hw_stopped = 0;
1480                         tty_wakeup(tty);
1481                 } else {
1482                         tty->hw_stopped = 1;
1483                 }
1484         }
1485         tty_kref_put(tty);
1486 }
1487
1488
1489 static void ti_drain(struct ti_port *tport, unsigned long timeout, int flush)
1490 {
1491         struct ti_device *tdev = tport->tp_tdev;
1492         struct usb_serial_port *port = tport->tp_port;
1493         wait_queue_t wait;
1494
1495         dbg("%s - port %d", __func__, port->number);
1496
1497         spin_lock_irq(&tport->tp_lock);
1498
1499         /* wait for data to drain from the buffer */
1500         tdev->td_urb_error = 0;
1501         init_waitqueue_entry(&wait, current);
1502         add_wait_queue(&tport->tp_write_wait, &wait);
1503         for (;;) {
1504                 set_current_state(TASK_INTERRUPTIBLE);
1505                 if (ti_buf_data_avail(tport->tp_write_buf) == 0
1506                 || timeout == 0 || signal_pending(current)
1507                 || tdev->td_urb_error
1508                 || port->serial->disconnected)  /* disconnect */
1509                         break;
1510                 spin_unlock_irq(&tport->tp_lock);
1511                 timeout = schedule_timeout(timeout);
1512                 spin_lock_irq(&tport->tp_lock);
1513         }
1514         set_current_state(TASK_RUNNING);
1515         remove_wait_queue(&tport->tp_write_wait, &wait);
1516
1517         /* flush any remaining data in the buffer */
1518         if (flush)
1519                 ti_buf_clear(tport->tp_write_buf);
1520
1521         spin_unlock_irq(&tport->tp_lock);
1522
1523         mutex_lock(&port->serial->disc_mutex);
1524         /* wait for data to drain from the device */
1525         /* wait for empty tx register, plus 20 ms */
1526         timeout += jiffies;
1527         tport->tp_lsr &= ~TI_LSR_TX_EMPTY;
1528         while ((long)(jiffies - timeout) < 0 && !signal_pending(current)
1529         && !(tport->tp_lsr&TI_LSR_TX_EMPTY) && !tdev->td_urb_error
1530         && !port->serial->disconnected) {
1531                 if (ti_get_lsr(tport))
1532                         break;
1533                 mutex_unlock(&port->serial->disc_mutex);
1534                 msleep_interruptible(20);
1535                 mutex_lock(&port->serial->disc_mutex);
1536         }
1537         mutex_unlock(&port->serial->disc_mutex);
1538 }
1539
1540
1541 static void ti_stop_read(struct ti_port *tport, struct tty_struct *tty)
1542 {
1543         unsigned long flags;
1544
1545         spin_lock_irqsave(&tport->tp_lock, flags);
1546
1547         if (tport->tp_read_urb_state == TI_READ_URB_RUNNING)
1548                 tport->tp_read_urb_state = TI_READ_URB_STOPPING;
1549
1550         spin_unlock_irqrestore(&tport->tp_lock, flags);
1551 }
1552
1553
1554 static int ti_restart_read(struct ti_port *tport, struct tty_struct *tty)
1555 {
1556         struct urb *urb;
1557         int status = 0;
1558         unsigned long flags;
1559
1560         spin_lock_irqsave(&tport->tp_lock, flags);
1561
1562         if (tport->tp_read_urb_state == TI_READ_URB_STOPPED) {
1563                 tport->tp_read_urb_state = TI_READ_URB_RUNNING;
1564                 urb = tport->tp_port->read_urb;
1565                 spin_unlock_irqrestore(&tport->tp_lock, flags);
1566                 urb->complete = ti_bulk_in_callback;
1567                 urb->context = tport;
1568                 urb->dev = tport->tp_port->serial->dev;
1569                 status = usb_submit_urb(urb, GFP_KERNEL);
1570         } else  {
1571                 tport->tp_read_urb_state = TI_READ_URB_RUNNING;
1572                 spin_unlock_irqrestore(&tport->tp_lock, flags);
1573         }
1574
1575         return status;
1576 }
1577
1578
1579 static int ti_command_out_sync(struct ti_device *tdev, __u8 command,
1580         __u16 moduleid, __u16 value, __u8 *data, int size)
1581 {
1582         int status;
1583
1584         status = usb_control_msg(tdev->td_serial->dev,
1585                 usb_sndctrlpipe(tdev->td_serial->dev, 0), command,
1586                 (USB_TYPE_VENDOR | USB_RECIP_DEVICE | USB_DIR_OUT),
1587                 value, moduleid, data, size, 1000);
1588
1589         if (status == size)
1590                 status = 0;
1591
1592         if (status > 0)
1593                 status = -ECOMM;
1594
1595         return status;
1596 }
1597
1598
1599 static int ti_command_in_sync(struct ti_device *tdev, __u8 command,
1600         __u16 moduleid, __u16 value, __u8 *data, int size)
1601 {
1602         int status;
1603
1604         status = usb_control_msg(tdev->td_serial->dev,
1605                 usb_rcvctrlpipe(tdev->td_serial->dev, 0), command,
1606                 (USB_TYPE_VENDOR | USB_RECIP_DEVICE | USB_DIR_IN),
1607                 value, moduleid, data, size, 1000);
1608
1609         if (status == size)
1610                 status = 0;
1611
1612         if (status > 0)
1613                 status = -ECOMM;
1614
1615         return status;
1616 }
1617
1618
1619 static int ti_write_byte(struct ti_device *tdev, unsigned long addr,
1620         __u8 mask, __u8 byte)
1621 {
1622         int status;
1623         unsigned int size;
1624         struct ti_write_data_bytes *data;
1625         struct device *dev = &tdev->td_serial->dev->dev;
1626
1627         dbg("%s - addr 0x%08lX, mask 0x%02X, byte 0x%02X",
1628                                         __func__, addr, mask, byte);
1629
1630         size = sizeof(struct ti_write_data_bytes) + 2;
1631         data = kmalloc(size, GFP_KERNEL);
1632         if (!data) {
1633                 dev_err(dev, "%s - out of memory\n", __func__);
1634                 return -ENOMEM;
1635         }
1636
1637         data->bAddrType = TI_RW_DATA_ADDR_XDATA;
1638         data->bDataType = TI_RW_DATA_BYTE;
1639         data->bDataCounter = 1;
1640         data->wBaseAddrHi = cpu_to_be16(addr>>16);
1641         data->wBaseAddrLo = cpu_to_be16(addr);
1642         data->bData[0] = mask;
1643         data->bData[1] = byte;
1644
1645         status = ti_command_out_sync(tdev, TI_WRITE_DATA, TI_RAM_PORT, 0,
1646                 (__u8 *)data, size);
1647
1648         if (status < 0)
1649                 dev_err(dev, "%s - failed, %d\n", __func__, status);
1650
1651         kfree(data);
1652
1653         return status;
1654 }
1655
1656 static int ti_do_download(struct usb_device *dev, int pipe,
1657                                                 u8 *buffer, int size)
1658 {
1659         int pos;
1660         u8 cs = 0;
1661         int done;
1662         struct ti_firmware_header *header;
1663         int status;
1664         int len;
1665
1666         for (pos = sizeof(struct ti_firmware_header); pos < size; pos++)
1667                 cs = (__u8)(cs + buffer[pos]);
1668
1669         header = (struct ti_firmware_header *)buffer;
1670         header->wLength = cpu_to_le16((__u16)(size
1671                                         - sizeof(struct ti_firmware_header)));
1672         header->bCheckSum = cs;
1673
1674         dbg("%s - downloading firmware", __func__);
1675         for (pos = 0; pos < size; pos += done) {
1676                 len = min(size - pos, TI_DOWNLOAD_MAX_PACKET_SIZE);
1677                 status = usb_bulk_msg(dev, pipe, buffer + pos, len,
1678                                                                 &done, 1000);
1679                 if (status)
1680                         break;
1681         }
1682         return status;
1683 }
1684
1685 static int ti_download_firmware(struct ti_device *tdev)
1686 {
1687         int status;
1688         int buffer_size;
1689         __u8 *buffer;
1690         struct usb_device *dev = tdev->td_serial->dev;
1691         unsigned int pipe = usb_sndbulkpipe(dev,
1692                 tdev->td_serial->port[0]->bulk_out_endpointAddress);
1693         const struct firmware *fw_p;
1694         char buf[32];
1695
1696         /* try ID specific firmware first, then try generic firmware */
1697         sprintf(buf, "ti_usb-v%04x-p%04x.fw", dev->descriptor.idVendor,
1698             dev->descriptor.idProduct);
1699         if ((status = request_firmware(&fw_p, buf, &dev->dev)) != 0) {
1700                 buf[0] = '\0';
1701                 if (dev->descriptor.idVendor == MTS_VENDOR_ID) {
1702                         switch (dev->descriptor.idProduct) {
1703                         case MTS_CDMA_PRODUCT_ID:
1704                                 strcpy(buf, "mts_cdma.fw");
1705                                 break;
1706                         case MTS_GSM_PRODUCT_ID:
1707                                 strcpy(buf, "mts_gsm.fw");
1708                                 break;
1709                         case MTS_EDGE_PRODUCT_ID:
1710                                 strcpy(buf, "mts_edge.fw");
1711                                 break;
1712                         }
1713                 }
1714                 if (buf[0] == '\0') {
1715                         if (tdev->td_is_3410)
1716                                 strcpy(buf, "ti_3410.fw");
1717                         else
1718                                 strcpy(buf, "ti_5052.fw");
1719                 }
1720                 status = request_firmware(&fw_p, buf, &dev->dev);
1721         }
1722         if (status) {
1723                 dev_err(&dev->dev, "%s - firmware not found\n", __func__);
1724                 return -ENOENT;
1725         }
1726         if (fw_p->size > TI_FIRMWARE_BUF_SIZE) {
1727                 dev_err(&dev->dev, "%s - firmware too large\n", __func__);
1728                 return -ENOENT;
1729         }
1730
1731         buffer_size = TI_FIRMWARE_BUF_SIZE + sizeof(struct ti_firmware_header);
1732         buffer = kmalloc(buffer_size, GFP_KERNEL);
1733         if (buffer) {
1734                 memcpy(buffer, fw_p->data, fw_p->size);
1735                 memset(buffer + fw_p->size, 0xff, buffer_size - fw_p->size);
1736                 status = ti_do_download(dev, pipe, buffer, fw_p->size);
1737                 kfree(buffer);
1738         } else {
1739                 status = -ENOMEM;
1740         }
1741         release_firmware(fw_p);
1742         if (status) {
1743                 dev_err(&dev->dev, "%s - error downloading firmware, %d\n",
1744                                                         __func__, status);
1745                 return status;
1746         }
1747
1748         dbg("%s - download successful", __func__);
1749
1750         return 0;
1751 }
1752
1753
1754 /* Circular Buffer Functions */
1755
1756 /*
1757  * ti_buf_alloc
1758  *
1759  * Allocate a circular buffer and all associated memory.
1760  */
1761
1762 static struct circ_buf *ti_buf_alloc(void)
1763 {
1764         struct circ_buf *cb;
1765
1766         cb = kmalloc(sizeof(struct circ_buf), GFP_KERNEL);
1767         if (cb == NULL)
1768                 return NULL;
1769
1770         cb->buf = kmalloc(TI_WRITE_BUF_SIZE, GFP_KERNEL);
1771         if (cb->buf == NULL) {
1772                 kfree(cb);
1773                 return NULL;
1774         }
1775
1776         ti_buf_clear(cb);
1777
1778         return cb;
1779 }
1780
1781
1782 /*
1783  * ti_buf_free
1784  *
1785  * Free the buffer and all associated memory.
1786  */
1787
1788 static void ti_buf_free(struct circ_buf *cb)
1789 {
1790         kfree(cb->buf);
1791         kfree(cb);
1792 }
1793
1794
1795 /*
1796  * ti_buf_clear
1797  *
1798  * Clear out all data in the circular buffer.
1799  */
1800
1801 static void ti_buf_clear(struct circ_buf *cb)
1802 {
1803         cb->head = cb->tail = 0;
1804 }
1805
1806
1807 /*
1808  * ti_buf_data_avail
1809  *
1810  * Return the number of bytes of data available in the circular
1811  * buffer.
1812  */
1813
1814 static int ti_buf_data_avail(struct circ_buf *cb)
1815 {
1816         return CIRC_CNT(cb->head, cb->tail, TI_WRITE_BUF_SIZE);
1817 }
1818
1819
1820 /*
1821  * ti_buf_space_avail
1822  *
1823  * Return the number of bytes of space available in the circular
1824  * buffer.
1825  */
1826
1827 static int ti_buf_space_avail(struct circ_buf *cb)
1828 {
1829         return CIRC_SPACE(cb->head, cb->tail, TI_WRITE_BUF_SIZE);
1830 }
1831
1832
1833 /*
1834  * ti_buf_put
1835  *
1836  * Copy data data from a user buffer and put it into the circular buffer.
1837  * Restrict to the amount of space available.
1838  *
1839  * Return the number of bytes copied.
1840  */
1841
1842 static int ti_buf_put(struct circ_buf *cb, const char *buf, int count)
1843 {
1844         int c, ret = 0;
1845
1846         while (1) {
1847                 c = CIRC_SPACE_TO_END(cb->head, cb->tail, TI_WRITE_BUF_SIZE);
1848                 if (count < c)
1849                         c = count;
1850                 if (c <= 0)
1851                         break;
1852                 memcpy(cb->buf + cb->head, buf, c);
1853                 cb->head = (cb->head + c) & (TI_WRITE_BUF_SIZE-1);
1854                 buf += c;
1855                 count -= c;
1856                 ret += c;
1857         }
1858
1859         return ret;
1860 }
1861
1862
1863 /*
1864  * ti_buf_get
1865  *
1866  * Get data from the circular buffer and copy to the given buffer.
1867  * Restrict to the amount of data available.
1868  *
1869  * Return the number of bytes copied.
1870  */
1871
1872 static int ti_buf_get(struct circ_buf *cb, char *buf, int count)
1873 {
1874         int c, ret = 0;
1875
1876         while (1) {
1877                 c = CIRC_CNT_TO_END(cb->head, cb->tail, TI_WRITE_BUF_SIZE);
1878                 if (count < c)
1879                         c = count;
1880                 if (c <= 0)
1881                         break;
1882                 memcpy(buf, cb->buf + cb->tail, c);
1883                 cb->tail = (cb->tail + c) & (TI_WRITE_BUF_SIZE-1);
1884                 buf += c;
1885                 count -= c;
1886                 ret += c;
1887         }
1888
1889         return ret;
1890 }