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
  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_LOW_LATENCY  0
  54 #define TI_DEFAULT_CLOSING_WAIT 4000            /* in .01 secs */
  55
  56 /* supported setserial flags */
  57 #define TI_SET_SERIAL_FLAGS     (ASYNC_LOW_LATENCY)
  58
  59 /* read urb states */
  60 #define TI_READ_URB_RUNNING     0
  61 #define TI_READ_URB_STOPPING    1
  62 #define TI_READ_URB_STOPPED     2
  63
  64 #define TI_EXTRA_VID_PID_COUNT  5
  65
  66
  67 /* Structures */
  68
  69 struct ti_port {
  70         int                     tp_is_open;
  71         __u8                    tp_msr;
  72         __u8                    tp_lsr;
  73         __u8                    tp_shadow_mcr;
  74         __u8                    tp_uart_mode;   /* 232 or 485 modes */
  75         unsigned int            tp_uart_base_addr;
  76         int                     tp_flags;
  77         int                     tp_closing_wait;/* in .01 secs */
  78         struct async_icount     tp_icount;
  79         wait_queue_head_t       tp_msr_wait;    /* wait for msr change */
  80         wait_queue_head_t       tp_write_wait;
  81         struct ti_device        *tp_tdev;
  82         struct usb_serial_port  *tp_port;
  83         spinlock_t              tp_lock;
  84         int                     tp_read_urb_state;
  85         int                     tp_write_urb_in_use;
  86         struct circ_buf         *tp_write_buf;
  87 };
  88
  89 struct ti_device {
  90         struct mutex            td_open_close_lock;
  91         int                     td_open_port_count;
  92         struct usb_serial       *td_serial;
  93         int                     td_is_3410;
  94         int                     td_urb_error;
  95 };
  96
  97
  98 /* Function Declarations */
  99
 100 static int ti_startup(struct usb_serial *serial);
 101 static void ti_shutdown(struct usb_serial *serial);
 102 static int ti_open(struct tty_struct *tty, struct usb_serial_port *port,
 103                 struct file *file);
 104 static void ti_close(struct tty_struct *tty, struct usb_serial_port *port,
 105                 struct file *file);
 106 static int ti_write(struct tty_struct *tty, struct usb_serial_port *port,
 107                 const unsigned char *data, int count);
 108 static int ti_write_room(struct tty_struct *tty);
 109 static int ti_chars_in_buffer(struct tty_struct *tty);
 110 static void ti_throttle(struct tty_struct *tty);
 111 static void ti_unthrottle(struct tty_struct *tty);
 112 static int ti_ioctl(struct tty_struct *tty, struct file *file,
 113                 unsigned int cmd, unsigned long arg);
 114 static void ti_set_termios(struct tty_struct *tty,
 115                 struct usb_serial_port *port, struct ktermios *old_termios);
 116 static int ti_tiocmget(struct tty_struct *tty, struct file *file);
 117 static int ti_tiocmset(struct tty_struct *tty, struct file *file,
 118                 unsigned int set, unsigned int clear);
 119 static void ti_break(struct tty_struct *tty, int break_state);
 120 static void ti_interrupt_callback(struct urb *urb);
 121 static void ti_bulk_in_callback(struct urb *urb);
 122 static void ti_bulk_out_callback(struct urb *urb);
 123
 124 static void ti_recv(struct device *dev, struct tty_struct *tty,
 125         unsigned char *data, int length);
 126 static void ti_send(struct ti_port *tport);
 127 static int ti_set_mcr(struct ti_port *tport, unsigned int mcr);
 128 static int ti_get_lsr(struct ti_port *tport);
 129 static int ti_get_serial_info(struct ti_port *tport,
 130         struct serial_struct __user *ret_arg);
 131 static int ti_set_serial_info(struct tty_struct *tty, struct ti_port *tport,
 132         struct serial_struct __user *new_arg);
 133 static void ti_handle_new_msr(struct ti_port *tport, __u8 msr);
 134
 135 static void ti_drain(struct ti_port *tport, unsigned long timeout, int flush);
 136
 137 static void ti_stop_read(struct ti_port *tport, struct tty_struct *tty);
 138 static int ti_restart_read(struct ti_port *tport, struct tty_struct *tty);
 139
 140 static int ti_command_out_sync(struct ti_device *tdev, __u8 command,
 141         __u16 moduleid, __u16 value, __u8 *data, int size);
 142 static int ti_command_in_sync(struct ti_device *tdev, __u8 command,
 143         __u16 moduleid, __u16 value, __u8 *data, int size);
 144
 145 static int ti_write_byte(struct ti_device *tdev, unsigned long addr,
 146         __u8 mask, __u8 byte);
 147
 148 static int ti_download_firmware(struct ti_device *tdev);
 149
 150 /* circular buffer */
 151 static struct circ_buf *ti_buf_alloc(void);
 152 static void ti_buf_free(struct circ_buf *cb);
 153 static void ti_buf_clear(struct circ_buf *cb);
 154 static int ti_buf_data_avail(struct circ_buf *cb);
 155 static int ti_buf_space_avail(struct circ_buf *cb);
 156 static int ti_buf_put(struct circ_buf *cb, const char *buf, int count);
 157 static int ti_buf_get(struct circ_buf *cb, char *buf, int count);
 158
 159
 160 /* Data */
 161
 162 /* module parameters */
 163 static int debug;
 164 static int low_latency = TI_DEFAULT_LOW_LATENCY;
 165 static int closing_wait = TI_DEFAULT_CLOSING_WAIT;
 166 static ushort vendor_3410[TI_EXTRA_VID_PID_COUNT];
 167 static unsigned int vendor_3410_count;
 168 static ushort product_3410[TI_EXTRA_VID_PID_COUNT];
 169 static unsigned int product_3410_count;
 170 static ushort vendor_5052[TI_EXTRA_VID_PID_COUNT];
 171 static unsigned int vendor_5052_count;
 172 static ushort product_5052[TI_EXTRA_VID_PID_COUNT];
 173 static unsigned int product_5052_count;
 174
 175 /* supported devices */
 176 /* the array dimension is the number of default entries plus */
 177 /* TI_EXTRA_VID_PID_COUNT user defined entries plus 1 terminating */
 178 /* null entry */
 179 static struct usb_device_id ti_id_table_3410[7+TI_EXTRA_VID_PID_COUNT+1] = {
 180         { USB_DEVICE(TI_VENDOR_ID, TI_3410_PRODUCT_ID) },
 181         { USB_DEVICE(TI_VENDOR_ID, TI_3410_EZ430_ID) },
 182         { USB_DEVICE(MTS_VENDOR_ID, MTS_GSM_NO_FW_PRODUCT_ID) },
 183         { USB_DEVICE(MTS_VENDOR_ID, MTS_CDMA_NO_FW_PRODUCT_ID) },
 184         { USB_DEVICE(MTS_VENDOR_ID, MTS_CDMA_PRODUCT_ID) },
 185         { USB_DEVICE(MTS_VENDOR_ID, MTS_GSM_PRODUCT_ID) },
 186         { USB_DEVICE(MTS_VENDOR_ID, MTS_EDGE_PRODUCT_ID) },
 187 };
 188
 189 static struct usb_device_id ti_id_table_5052[4+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 };
 195
 196 static struct usb_device_id ti_id_table_combined[6+2*TI_EXTRA_VID_PID_COUNT+1] = {
 197         { USB_DEVICE(TI_VENDOR_ID, TI_3410_PRODUCT_ID) },
 198         { USB_DEVICE(TI_VENDOR_ID, TI_3410_EZ430_ID) },
 199         { USB_DEVICE(MTS_VENDOR_ID, MTS_GSM_NO_FW_PRODUCT_ID) },
 200         { USB_DEVICE(MTS_VENDOR_ID, MTS_CDMA_NO_FW_PRODUCT_ID) },
 201         { USB_DEVICE(MTS_VENDOR_ID, MTS_CDMA_PRODUCT_ID) },
 202         { USB_DEVICE(MTS_VENDOR_ID, MTS_GSM_PRODUCT_ID) },
 203         { USB_DEVICE(MTS_VENDOR_ID, MTS_EDGE_PRODUCT_ID) },
 204         { USB_DEVICE(TI_VENDOR_ID, TI_5052_BOOT_PRODUCT_ID) },
 205         { USB_DEVICE(TI_VENDOR_ID, TI_5152_BOOT_PRODUCT_ID) },
 206         { USB_DEVICE(TI_VENDOR_ID, TI_5052_EEPROM_PRODUCT_ID) },
 207         { USB_DEVICE(TI_VENDOR_ID, TI_5052_FIRMWARE_PRODUCT_ID) },
 208         { }
 209 };
 210
 211 static struct usb_driver ti_usb_driver = {
 212         .name                   = "ti_usb_3410_5052",
 213         .probe                  = usb_serial_probe,
 214         .disconnect             = usb_serial_disconnect,
 215         .id_table               = ti_id_table_combined,
 216         .no_dynamic_id =        1,
 217 };
 218
 219 static struct usb_serial_driver ti_1port_device = {
 220         .driver = {
 221                 .owner          = THIS_MODULE,
 222                 .name           = "ti_usb_3410_5052_1",
 223         },
 224         .description            = "TI USB 3410 1 port adapter",
 225         .usb_driver             = &ti_usb_driver,
 226         .id_table               = ti_id_table_3410,
 227         .num_ports              = 1,
 228         .attach                 = ti_startup,
 229         .shutdown               = ti_shutdown,
 230         .open                   = ti_open,
 231         .close                  = ti_close,
 232         .write                  = ti_write,
 233         .write_room             = ti_write_room,
 234         .chars_in_buffer        = ti_chars_in_buffer,
 235         .throttle               = ti_throttle,
 236         .unthrottle             = ti_unthrottle,
 237         .ioctl                  = ti_ioctl,
 238         .set_termios            = ti_set_termios,
 239         .tiocmget               = ti_tiocmget,
 240         .tiocmset               = ti_tiocmset,
 241         .break_ctl              = ti_break,
 242         .read_int_callback      = ti_interrupt_callback,
 243         .read_bulk_callback     = ti_bulk_in_callback,
 244         .write_bulk_callback    = ti_bulk_out_callback,
 245 };
 246
 247 static struct usb_serial_driver ti_2port_device = {
 248         .driver = {
 249                 .owner          = THIS_MODULE,
 250                 .name           = "ti_usb_3410_5052_2",
 251         },
 252         .description            = "TI USB 5052 2 port adapter",
 253         .usb_driver             = &ti_usb_driver,
 254         .id_table               = ti_id_table_5052,
 255         .num_ports              = 2,
 256         .attach                 = ti_startup,
 257         .shutdown               = ti_shutdown,
 258         .open                   = ti_open,
 259         .close                  = ti_close,
 260         .write                  = ti_write,
 261         .write_room             = ti_write_room,
 262         .chars_in_buffer        = ti_chars_in_buffer,
 263         .throttle               = ti_throttle,
 264         .unthrottle             = ti_unthrottle,
 265         .ioctl                  = ti_ioctl,
 266         .set_termios            = ti_set_termios,
 267         .tiocmget               = ti_tiocmget,
 268         .tiocmset               = ti_tiocmset,
 269         .break_ctl              = ti_break,
 270         .read_int_callback      = ti_interrupt_callback,
 271         .read_bulk_callback     = ti_bulk_in_callback,
 272         .write_bulk_callback    = ti_bulk_out_callback,
 273 };
 274
 275
 276 /* Module */
 277
 278 MODULE_AUTHOR(TI_DRIVER_AUTHOR);
 279 MODULE_DESCRIPTION(TI_DRIVER_DESC);
 280 MODULE_VERSION(TI_DRIVER_VERSION);
 281 MODULE_LICENSE("GPL");
 282
 283 MODULE_FIRMWARE("ti_3410.fw");
 284 MODULE_FIRMWARE("ti_5052.fw");
 285
 286 module_param(debug, bool, S_IRUGO | S_IWUSR);
 287 MODULE_PARM_DESC(debug, "Enable debugging, 0=no, 1=yes");
 288
 289 module_param(low_latency, bool, S_IRUGO | S_IWUSR);
 290 MODULE_PARM_DESC(low_latency,
 291                 "TTY low_latency flag, 0=off, 1=on, default is off");
 292
 293 module_param(closing_wait, int, S_IRUGO | S_IWUSR);
 294 MODULE_PARM_DESC(closing_wait,
 295     "Maximum wait for data to drain in close, in .01 secs, default is 4000");
 296
 297 module_param_array(vendor_3410, ushort, &vendor_3410_count, S_IRUGO);
 298 MODULE_PARM_DESC(vendor_3410,
 299                 "Vendor ids for 3410 based devices, 1-5 short integers");
 300 module_param_array(product_3410, ushort, &product_3410_count, S_IRUGO);
 301 MODULE_PARM_DESC(product_3410,
 302                 "Product ids for 3410 based devices, 1-5 short integers");
 303 module_param_array(vendor_5052, ushort, &vendor_5052_count, S_IRUGO);
 304 MODULE_PARM_DESC(vendor_5052,
 305                 "Vendor ids for 5052 based devices, 1-5 short integers");
 306 module_param_array(product_5052, ushort, &product_5052_count, S_IRUGO);
 307 MODULE_PARM_DESC(product_5052,
 308                 "Product ids for 5052 based devices, 1-5 short integers");
 309
 310 MODULE_DEVICE_TABLE(usb, ti_id_table_combined);
 311
 312
 313 /* Functions */
 314
 315 static int __init ti_init(void)
 316 {
 317         int i, j, c;
 318         int ret;
 319
 320         /* insert extra vendor and product ids */
 321         c = ARRAY_SIZE(ti_id_table_combined) - 2 * TI_EXTRA_VID_PID_COUNT - 1;
 322         j = ARRAY_SIZE(ti_id_table_3410) - TI_EXTRA_VID_PID_COUNT - 1;
 323         for (i = 0; i < min(vendor_3410_count, product_3410_count); i++, j++, c++) {
 324                 ti_id_table_3410[j].idVendor = vendor_3410[i];
 325                 ti_id_table_3410[j].idProduct = product_3410[i];
 326                 ti_id_table_3410[j].match_flags = USB_DEVICE_ID_MATCH_DEVICE;
 327                 ti_id_table_combined[c].idVendor = vendor_3410[i];
 328                 ti_id_table_combined[c].idProduct = product_3410[i];
 329                 ti_id_table_combined[c].match_flags = USB_DEVICE_ID_MATCH_DEVICE;
 330         }
 331         j = ARRAY_SIZE(ti_id_table_5052) - TI_EXTRA_VID_PID_COUNT - 1;
 332         for (i = 0; i < min(vendor_5052_count, product_5052_count); i++, j++, c++) {
 333                 ti_id_table_5052[j].idVendor = vendor_5052[i];
 334                 ti_id_table_5052[j].idProduct = product_5052[i];
 335                 ti_id_table_5052[j].match_flags = USB_DEVICE_ID_MATCH_DEVICE;
 336                 ti_id_table_combined[c].idVendor = vendor_5052[i];
 337                 ti_id_table_combined[c].idProduct = product_5052[i];
 338                 ti_id_table_combined[c].match_flags = USB_DEVICE_ID_MATCH_DEVICE;
 339         }
 340
 341         ret = usb_serial_register(&ti_1port_device);
 342         if (ret)
 343                 goto failed_1port;
 344         ret = usb_serial_register(&ti_2port_device);
 345         if (ret)
 346                 goto failed_2port;
 347
 348         ret = usb_register(&ti_usb_driver);
 349         if (ret)
 350                 goto failed_usb;
 351
 352         printk(KERN_INFO KBUILD_MODNAME ": " TI_DRIVER_VERSION ":"
 353                TI_DRIVER_DESC "\n");
 354
 355         return 0;
 356
 357 failed_usb:
 358         usb_serial_deregister(&ti_2port_device);
 359 failed_2port:
 360         usb_serial_deregister(&ti_1port_device);
 361 failed_1port:
 362         return ret;
 363 }
 364
 365
 366 static void __exit ti_exit(void)
 367 {
 368         usb_serial_deregister(&ti_1port_device);
 369         usb_serial_deregister(&ti_2port_device);
 370         usb_deregister(&ti_usb_driver);
 371 }
 372
 373
 374 module_init(ti_init);
 375 module_exit(ti_exit);
 376
 377
 378 static int ti_startup(struct usb_serial *serial)
 379 {
 380         struct ti_device *tdev;
 381         struct ti_port *tport;
 382         struct usb_device *dev = serial->dev;
 383         int status;
 384         int i;
 385
 386
 387         dbg("%s - product 0x%4X, num configurations %d, configuration value %d",
 388             __func__, le16_to_cpu(dev->descriptor.idProduct),
 389             dev->descriptor.bNumConfigurations,
 390             dev->actconfig->desc.bConfigurationValue);
 391
 392         /* create device structure */
 393         tdev = kzalloc(sizeof(struct ti_device), GFP_KERNEL);
 394         if (tdev == NULL) {
 395                 dev_err(&dev->dev, "%s - out of memory\n", __func__);
 396                 return -ENOMEM;
 397         }
 398         mutex_init(&tdev->td_open_close_lock);
 399         tdev->td_serial = serial;
 400         usb_set_serial_data(serial, tdev);
 401
 402         /* determine device type */
 403         if (usb_match_id(serial->interface, ti_id_table_3410))
 404                 tdev->td_is_3410 = 1;
 405         dbg("%s - device type is %s", __func__,
 406                                 tdev->td_is_3410 ? "3410" : "5052");
 407
 408         /* if we have only 1 configuration, download firmware */
 409         if (dev->descriptor.bNumConfigurations == 1) {
 410                 if ((status = ti_download_firmware(tdev)) != 0)
 411                         goto free_tdev;
 412
 413                 /* 3410 must be reset, 5052 resets itself */
 414                 if (tdev->td_is_3410) {
 415                         msleep_interruptible(100);
 416                         usb_reset_device(dev);
 417                 }
 418
 419                 status = -ENODEV;
 420                 goto free_tdev;
 421         }
 422
 423         /* the second configuration must be set */
 424         if (dev->actconfig->desc.bConfigurationValue == TI_BOOT_CONFIG) {
 425                 status = usb_driver_set_configuration(dev, TI_ACTIVE_CONFIG);
 426                 status = status ? status : -ENODEV;
 427                 goto free_tdev;
 428         }
 429
 430         /* set up port structures */
 431         for (i = 0; i < serial->num_ports; ++i) {
 432                 tport = kzalloc(sizeof(struct ti_port), GFP_KERNEL);
 433                 if (tport == NULL) {
 434                         dev_err(&dev->dev, "%s - out of memory\n", __func__);
 435                         status = -ENOMEM;
 436                         goto free_tports;
 437                 }
 438                 spin_lock_init(&tport->tp_lock);
 439                 tport->tp_uart_base_addr = (i == 0 ?
 440                                 TI_UART1_BASE_ADDR : TI_UART2_BASE_ADDR);
 441                 tport->tp_flags = low_latency ? ASYNC_LOW_LATENCY : 0;
 442                 tport->tp_closing_wait = closing_wait;
 443                 init_waitqueue_head(&tport->tp_msr_wait);
 444                 init_waitqueue_head(&tport->tp_write_wait);
 445                 tport->tp_write_buf = ti_buf_alloc();
 446                 if (tport->tp_write_buf == NULL) {
 447                         dev_err(&dev->dev, "%s - out of memory\n", __func__);
 448                         kfree(tport);
 449                         status = -ENOMEM;
 450                         goto free_tports;
 451                 }
 452                 tport->tp_port = serial->port[i];
 453                 tport->tp_tdev = tdev;
 454                 usb_set_serial_port_data(serial->port[i], tport);
 455                 tport->tp_uart_mode = 0;        /* default is RS232 */
 456         }
 457
 458         return 0;
 459
 460 free_tports:
 461         for (--i; i >= 0; --i) {
 462                 tport = usb_get_serial_port_data(serial->port[i]);
 463                 ti_buf_free(tport->tp_write_buf);
 464                 kfree(tport);
 465                 usb_set_serial_port_data(serial->port[i], NULL);
 466         }
 467 free_tdev:
 468         kfree(tdev);
 469         usb_set_serial_data(serial, NULL);
 470         return status;
 471 }
 472
 473
 474 static void ti_shutdown(struct usb_serial *serial)
 475 {
 476         int i;
 477         struct ti_device *tdev = usb_get_serial_data(serial);
 478         struct ti_port *tport;
 479
 480         dbg("%s", __func__);
 481
 482         for (i = 0; i < serial->num_ports; ++i) {
 483                 tport = usb_get_serial_port_data(serial->port[i]);
 484                 if (tport) {
 485                         ti_buf_free(tport->tp_write_buf);
 486                         kfree(tport);
 487                         usb_set_serial_port_data(serial->port[i], NULL);
 488                 }
 489         }
 490
 491         kfree(tdev);
 492         usb_set_serial_data(serial, NULL);
 493 }
 494
 495
 496 static int ti_open(struct tty_struct *tty,
 497                         struct usb_serial_port *port, struct file *file)
 498 {
 499         struct ti_port *tport = usb_get_serial_port_data(port);
 500         struct ti_device *tdev;
 501         struct usb_device *dev;
 502         struct urb *urb;
 503         int port_number;
 504         int status;
 505         __u16 open_settings = (__u8)(TI_PIPE_MODE_CONTINOUS |
 506                              TI_PIPE_TIMEOUT_ENABLE |
 507                              (TI_TRANSFER_TIMEOUT << 2));
 508
 509         dbg("%s - port %d", __func__, port->number);
 510
 511         if (tport == NULL)
 512                 return -ENODEV;
 513
 514         dev = port->serial->dev;
 515         tdev = tport->tp_tdev;
 516
 517         /* only one open on any port on a device at a time */
 518         if (mutex_lock_interruptible(&tdev->td_open_close_lock))
 519                 return -ERESTARTSYS;
 520
 521         if (tty)
 522                 tty->low_latency =
 523                                 (tport->tp_flags & ASYNC_LOW_LATENCY) ? 1 : 0;
 524
 525         port_number = port->number - port->serial->minor;
 526
 527         memset(&(tport->tp_icount), 0x00, sizeof(tport->tp_icount));
 528
 529         tport->tp_msr = 0;
 530         tport->tp_shadow_mcr |= (TI_MCR_RTS | TI_MCR_DTR);
 531
 532         /* start interrupt urb the first time a port is opened on this device */
 533         if (tdev->td_open_port_count == 0) {
 534                 dbg("%s - start interrupt in urb", __func__);
 535                 urb = tdev->td_serial->port[0]->interrupt_in_urb;
 536                 if (!urb) {
 537                         dev_err(&port->dev, "%s - no interrupt urb\n",
 538                                                                 __func__);
 539                         status = -EINVAL;
 540                         goto release_lock;
 541                 }
 542                 urb->complete = ti_interrupt_callback;
 543                 urb->context = tdev;
 544                 urb->dev = dev;
 545                 status = usb_submit_urb(urb, GFP_KERNEL);
 546                 if (status) {
 547                         dev_err(&port->dev,
 548                                 "%s - submit interrupt urb failed, %d\n",
 549                                         __func__, status);
 550                         goto release_lock;
 551                 }
 552         }
 553
 554         if (tty)
 555                 ti_set_termios(tty, port, tty->termios);
 556
 557         dbg("%s - sending TI_OPEN_PORT", __func__);
 558         status = ti_command_out_sync(tdev, TI_OPEN_PORT,
 559                 (__u8)(TI_UART1_PORT + port_number), open_settings, NULL, 0);
 560         if (status) {
 561                 dev_err(&port->dev, "%s - cannot send open command, %d\n",
 562                                                         __func__, status);
 563                 goto unlink_int_urb;
 564         }
 565
 566         dbg("%s - sending TI_START_PORT", __func__);
 567         status = ti_command_out_sync(tdev, TI_START_PORT,
 568                 (__u8)(TI_UART1_PORT + port_number), 0, NULL, 0);
 569         if (status) {
 570                 dev_err(&port->dev, "%s - cannot send start command, %d\n",
 571                                                         __func__, status);
 572                 goto unlink_int_urb;
 573         }
 574
 575         dbg("%s - sending TI_PURGE_PORT", __func__);
 576         status = ti_command_out_sync(tdev, TI_PURGE_PORT,
 577                 (__u8)(TI_UART1_PORT + port_number), TI_PURGE_INPUT, NULL, 0);
 578         if (status) {
 579                 dev_err(&port->dev, "%s - cannot clear input buffers, %d\n",
 580                                                         __func__, status);
 581                 goto unlink_int_urb;
 582         }
 583         status = ti_command_out_sync(tdev, TI_PURGE_PORT,
 584                 (__u8)(TI_UART1_PORT + port_number), TI_PURGE_OUTPUT, NULL, 0);
 585         if (status) {
 586                 dev_err(&port->dev, "%s - cannot clear output buffers, %d\n",
 587                                                         __func__, status);
 588                 goto unlink_int_urb;
 589         }
 590
 591         /* reset the data toggle on the bulk endpoints to work around bug in
 592          * host controllers where things get out of sync some times */
 593         usb_clear_halt(dev, port->write_urb->pipe);
 594         usb_clear_halt(dev, port->read_urb->pipe);
 595
 596         if (tty)
 597                 ti_set_termios(tty, port, tty->termios);
 598
 599         dbg("%s - sending TI_OPEN_PORT (2)", __func__);
 600         status = ti_command_out_sync(tdev, TI_OPEN_PORT,
 601                 (__u8)(TI_UART1_PORT + port_number), open_settings, NULL, 0);
 602         if (status) {
 603                 dev_err(&port->dev, "%s - cannot send open command (2), %d\n",
 604                                                         __func__, status);
 605                 goto unlink_int_urb;
 606         }
 607
 608         dbg("%s - sending TI_START_PORT (2)", __func__);
 609         status = ti_command_out_sync(tdev, TI_START_PORT,
 610                 (__u8)(TI_UART1_PORT + port_number), 0, NULL, 0);
 611         if (status) {
 612                 dev_err(&port->dev, "%s - cannot send start command (2), %d\n",
 613                                                         __func__, status);
 614                 goto unlink_int_urb;
 615         }
 616
 617         /* start read urb */
 618         dbg("%s - start read urb", __func__);
 619         urb = port->read_urb;
 620         if (!urb) {
 621                 dev_err(&port->dev, "%s - no read urb\n", __func__);
 622                 status = -EINVAL;
 623                 goto unlink_int_urb;
 624         }
 625         tport->tp_read_urb_state = TI_READ_URB_RUNNING;
 626         urb->complete = ti_bulk_in_callback;
 627         urb->context = tport;
 628         urb->dev = dev;
 629         status = usb_submit_urb(urb, GFP_KERNEL);
 630         if (status) {
 631                 dev_err(&port->dev, "%s - submit read urb failed, %d\n",
 632                                                         __func__, status);
 633                 goto unlink_int_urb;
 634         }
 635
 636         tport->tp_is_open = 1;
 637         ++tdev->td_open_port_count;
 638
 639         goto release_lock;
 640
 641 unlink_int_urb:
 642         if (tdev->td_open_port_count == 0)
 643                 usb_kill_urb(port->serial->port[0]->interrupt_in_urb);
 644 release_lock:
 645         mutex_unlock(&tdev->td_open_close_lock);
 646         dbg("%s - exit %d", __func__, status);
 647         return status;
 648 }
 649
 650
 651 static void ti_close(struct tty_struct *tty, struct usb_serial_port *port,
 652                                                         struct file *file)
 653 {
 654         struct ti_device *tdev;
 655         struct ti_port *tport;
 656         int port_number;
 657         int status;
 658         int do_unlock;
 659
 660         dbg("%s - port %d", __func__, port->number);
 661
 662         tdev = usb_get_serial_data(port->serial);
 663         tport = usb_get_serial_port_data(port);
 664         if (tdev == NULL || tport == NULL)
 665                 return;
 666
 667         tport->tp_is_open = 0;
 668
 669         ti_drain(tport, (tport->tp_closing_wait*HZ)/100, 1);
 670
 671         usb_kill_urb(port->read_urb);
 672         usb_kill_urb(port->write_urb);
 673         tport->tp_write_urb_in_use = 0;
 674
 675         port_number = port->number - port->serial->minor;
 676
 677         dbg("%s - sending TI_CLOSE_PORT", __func__);
 678         status = ti_command_out_sync(tdev, TI_CLOSE_PORT,
 679                      (__u8)(TI_UART1_PORT + port_number), 0, NULL, 0);
 680         if (status)
 681                 dev_err(&port->dev,
 682                         "%s - cannot send close port command, %d\n"
 683                                                         , __func__, status);
 684
 685         /* if mutex_lock is interrupted, continue anyway */
 686         do_unlock = !mutex_lock_interruptible(&tdev->td_open_close_lock);
 687         --tport->tp_tdev->td_open_port_count;
 688         if (tport->tp_tdev->td_open_port_count <= 0) {
 689                 /* last port is closed, shut down interrupt urb */
 690                 usb_kill_urb(port->serial->port[0]->interrupt_in_urb);
 691                 tport->tp_tdev->td_open_port_count = 0;
 692         }
 693         if (do_unlock)
 694                 mutex_unlock(&tdev->td_open_close_lock);
 695
 696         dbg("%s - exit", __func__);
 697 }
 698
 699
 700 static int ti_write(struct tty_struct *tty, struct usb_serial_port *port,
 701                         const unsigned char *data, int count)
 702 {
 703         struct ti_port *tport = usb_get_serial_port_data(port);
 704         unsigned long flags;
 705
 706         dbg("%s - port %d", __func__, port->number);
 707
 708         if (count == 0) {
 709                 dbg("%s - write request of 0 bytes", __func__);
 710                 return 0;
 711         }
 712
 713         if (tport == NULL || !tport->tp_is_open)
 714                 return -ENODEV;
 715
 716         spin_lock_irqsave(&tport->tp_lock, flags);
 717         count = ti_buf_put(tport->tp_write_buf, data, count);
 718         spin_unlock_irqrestore(&tport->tp_lock, flags);
 719
 720         ti_send(tport);
 721
 722         return count;
 723 }
 724
 725
 726 static int ti_write_room(struct tty_struct *tty)
 727 {
 728         struct usb_serial_port *port = tty->driver_data;
 729         struct ti_port *tport = usb_get_serial_port_data(port);
 730         int room = 0;
 731         unsigned long flags;
 732
 733         dbg("%s - port %d", __func__, port->number);
 734
 735         if (tport == NULL)
 736                 return -ENODEV;
 737
 738         spin_lock_irqsave(&tport->tp_lock, flags);
 739         room = ti_buf_space_avail(tport->tp_write_buf);
 740         spin_unlock_irqrestore(&tport->tp_lock, flags);
 741
 742         dbg("%s - returns %d", __func__, room);
 743         return room;
 744 }
 745
 746
 747 static int ti_chars_in_buffer(struct tty_struct *tty)
 748 {
 749         struct usb_serial_port *port = tty->driver_data;
 750         struct ti_port *tport = usb_get_serial_port_data(port);
 751         int chars = 0;
 752         unsigned long flags;
 753
 754         dbg("%s - port %d", __func__, port->number);
 755
 756         if (tport == NULL)
 757                 return -ENODEV;
 758
 759         spin_lock_irqsave(&tport->tp_lock, flags);
 760         chars = ti_buf_data_avail(tport->tp_write_buf);
 761         spin_unlock_irqrestore(&tport->tp_lock, flags);
 762
 763         dbg("%s - returns %d", __func__, chars);
 764         return chars;
 765 }
 766
 767
 768 static void ti_throttle(struct tty_struct *tty)
 769 {
 770         struct usb_serial_port *port = tty->driver_data;
 771         struct ti_port *tport = usb_get_serial_port_data(port);
 772
 773         dbg("%s - port %d", __func__, port->number);
 774
 775         if (tport == NULL)
 776                 return;
 777
 778         if (I_IXOFF(tty) || C_CRTSCTS(tty))
 779                 ti_stop_read(tport, tty);
 780
 781 }
 782
 783
 784 static void ti_unthrottle(struct tty_struct *tty)
 785 {
 786         struct usb_serial_port *port = tty->driver_data;
 787         struct ti_port *tport = usb_get_serial_port_data(port);
 788         int status;
 789
 790         dbg("%s - port %d", __func__, port->number);
 791
 792         if (tport == NULL)
 793                 return;
 794
 795         if (I_IXOFF(tty) || C_CRTSCTS(tty)) {
 796                 status = ti_restart_read(tport, tty);
 797                 if (status)
 798                         dev_err(&port->dev, "%s - cannot restart read, %d\n",
 799                                                         __func__, status);
 800         }
 801 }
 802
 803
 804 static int ti_ioctl(struct tty_struct *tty, struct file *file,
 805         unsigned int cmd, unsigned long arg)
 806 {
 807         struct usb_serial_port *port = tty->driver_data;
 808         struct ti_port *tport = usb_get_serial_port_data(port);
 809         struct async_icount cnow;
 810         struct async_icount cprev;
 811
 812         dbg("%s - port %d, cmd = 0x%04X", __func__, port->number, cmd);
 813
 814         if (tport == NULL)
 815                 return -ENODEV;
 816
 817         switch (cmd) {
 818         case TIOCGSERIAL:
 819                 dbg("%s - (%d) TIOCGSERIAL", __func__, port->number);
 820                 return ti_get_serial_info(tport,
 821                                 (struct serial_struct __user *)arg);
 822         case TIOCSSERIAL:
 823                 dbg("%s - (%d) TIOCSSERIAL", __func__, port->number);
 824                 return ti_set_serial_info(tty, tport,
 825                                 (struct serial_struct __user *)arg);
 826         case TIOCMIWAIT:
 827                 dbg("%s - (%d) TIOCMIWAIT", __func__, port->number);
 828                 cprev = tport->tp_icount;
 829                 while (1) {
 830                         interruptible_sleep_on(&tport->tp_msr_wait);
 831                         if (signal_pending(current))
 832                                 return -ERESTARTSYS;
 833                         cnow = tport->tp_icount;
 834                         if (cnow.rng == cprev.rng && cnow.dsr == cprev.dsr &&
 835                             cnow.dcd == cprev.dcd && cnow.cts == cprev.cts)
 836                                 return -EIO; /* no change => error */
 837                         if (((arg & TIOCM_RNG) && (cnow.rng != cprev.rng)) ||
 838                             ((arg & TIOCM_DSR) && (cnow.dsr != cprev.dsr)) ||
 839                             ((arg & TIOCM_CD)  && (cnow.dcd != cprev.dcd)) ||
 840                             ((arg & TIOCM_CTS) && (cnow.cts != cprev.cts)))
 841                                 return 0;
 842                         cprev = cnow;
 843                 }
 844                 break;
 845         case TIOCGICOUNT:
 846                 dbg("%s - (%d) TIOCGICOUNT RX=%d, TX=%d",
 847                                 __func__, port->number,
 848                                 tport->tp_icount.rx, tport->tp_icount.tx);
 849                 if (copy_to_user((void __user *)arg, &tport->tp_icount,
 850                                         sizeof(tport->tp_icount)))
 851                         return -EFAULT;
 852                 return 0;
 853         }
 854         return -ENOIOCTLCMD;
 855 }
 856
 857
 858 static void ti_set_termios(struct tty_struct *tty,
 859                 struct usb_serial_port *port, struct ktermios *old_termios)
 860 {
 861         struct ti_port *tport = usb_get_serial_port_data(port);
 862         struct ti_uart_config *config;
 863         tcflag_t cflag, iflag;
 864         int baud;
 865         int status;
 866         int port_number = port->number - port->serial->minor;
 867         unsigned int mcr;
 868
 869         dbg("%s - port %d", __func__, port->number);
 870
 871         cflag = tty->termios->c_cflag;
 872         iflag = tty->termios->c_iflag;
 873
 874         dbg("%s - cflag %08x, iflag %08x", __func__, cflag, iflag);
 875         dbg("%s - old clfag %08x, old iflag %08x", __func__,
 876                                 old_termios->c_cflag, old_termios->c_iflag);
 877
 878         if (tport == NULL)
 879                 return;
 880
 881         config = kmalloc(sizeof(*config), GFP_KERNEL);
 882         if (!config) {
 883                 dev_err(&port->dev, "%s - out of memory\n", __func__);
 884                 return;
 885         }
 886
 887         config->wFlags = 0;
 888
 889         /* these flags must be set */
 890         config->wFlags |= TI_UART_ENABLE_MS_INTS;
 891         config->wFlags |= TI_UART_ENABLE_AUTO_START_DMA;
 892         config->bUartMode = (__u8)(tport->tp_uart_mode);
 893
 894         switch (cflag & CSIZE) {
 895         case CS5:
 896                     config->bDataBits = TI_UART_5_DATA_BITS;
 897                     break;
 898         case CS6:
 899                     config->bDataBits = TI_UART_6_DATA_BITS;
 900                     break;
 901         case CS7:
 902                     config->bDataBits = TI_UART_7_DATA_BITS;
 903                     break;
 904         default:
 905         case CS8:
 906                     config->bDataBits = TI_UART_8_DATA_BITS;
 907                     break;
 908         }
 909
 910         /* CMSPAR isn't supported by this driver */
 911         tty->termios->c_cflag &= ~CMSPAR;
 912
 913         if (cflag & PARENB) {
 914                 if (cflag & PARODD) {
 915                         config->wFlags |= TI_UART_ENABLE_PARITY_CHECKING;
 916                         config->bParity = TI_UART_ODD_PARITY;
 917                 } else {
 918                         config->wFlags |= TI_UART_ENABLE_PARITY_CHECKING;
 919                         config->bParity = TI_UART_EVEN_PARITY;
 920                 }
 921         } else {
 922                 config->wFlags &= ~TI_UART_ENABLE_PARITY_CHECKING;
 923                 config->bParity = TI_UART_NO_PARITY;
 924         }
 925
 926         if (cflag & CSTOPB)
 927                 config->bStopBits = TI_UART_2_STOP_BITS;
 928         else
 929                 config->bStopBits = TI_UART_1_STOP_BITS;
 930
 931         if (cflag & CRTSCTS) {
 932                 /* RTS flow control must be off to drop RTS for baud rate B0 */
 933                 if ((cflag & CBAUD) != B0)
 934                         config->wFlags |= TI_UART_ENABLE_RTS_IN;
 935                 config->wFlags |= TI_UART_ENABLE_CTS_OUT;
 936         } else {
 937                 tty->hw_stopped = 0;
 938                 ti_restart_read(tport, tty);
 939         }
 940
 941         if (I_IXOFF(tty) || I_IXON(tty)) {
 942                 config->cXon  = START_CHAR(tty);
 943                 config->cXoff = STOP_CHAR(tty);
 944
 945                 if (I_IXOFF(tty))
 946                         config->wFlags |= TI_UART_ENABLE_X_IN;
 947                 else
 948                         ti_restart_read(tport, tty);
 949
 950                 if (I_IXON(tty))
 951                         config->wFlags |= TI_UART_ENABLE_X_OUT;
 952         }
 953
 954         baud = tty_get_baud_rate(tty);
 955         if (!baud)
 956                 baud = 9600;
 957         if (tport->tp_tdev->td_is_3410)
 958                 config->wBaudRate = (__u16)((923077 + baud/2) / baud);
 959         else
 960                 config->wBaudRate = (__u16)((461538 + baud/2) / baud);
 961
 962         /* FIXME: Should calculate resulting baud here and report it back */
 963         if ((cflag & CBAUD) != B0)
 964                 tty_encode_baud_rate(tty, baud, baud);
 965
 966         dbg("%s - BaudRate=%d, wBaudRate=%d, wFlags=0x%04X, bDataBits=%d, bParity=%d, bStopBits=%d, cXon=%d, cXoff=%d, bUartMode=%d",
 967         __func__, baud, config->wBaudRate, config->wFlags, config->bDataBits, config->bParity, config->bStopBits, config->cXon, config->cXoff, config->bUartMode);
 968
 969         cpu_to_be16s(&config->wBaudRate);
 970         cpu_to_be16s(&config->wFlags);
 971
 972         status = ti_command_out_sync(tport->tp_tdev, TI_SET_CONFIG,
 973                 (__u8)(TI_UART1_PORT + port_number), 0, (__u8 *)config,
 974                 sizeof(*config));
 975         if (status)
 976                 dev_err(&port->dev, "%s - cannot set config on port %d, %d\n",
 977                                         __func__, port_number, status);
 978
 979         /* SET_CONFIG asserts RTS and DTR, reset them correctly */
 980         mcr = tport->tp_shadow_mcr;
 981         /* if baud rate is B0, clear RTS and DTR */
 982         if ((cflag & CBAUD) == B0)
 983                 mcr &= ~(TI_MCR_DTR | TI_MCR_RTS);
 984         status = ti_set_mcr(tport, mcr);
 985         if (status)
 986                 dev_err(&port->dev,
 987                         "%s - cannot set modem control on port %d, %d\n",
 988                                                 __func__, port_number, status);
 989
 990         kfree(config);
 991 }
 992
 993
 994 static int ti_tiocmget(struct tty_struct *tty, struct file *file)
 995 {
 996         struct usb_serial_port *port = tty->driver_data;
 997         struct ti_port *tport = usb_get_serial_port_data(port);
 998         unsigned int result;
 999         unsigned int msr;
1000         unsigned int mcr;
1001         unsigned long flags;
1002
1003         dbg("%s - port %d", __func__, port->number);
1004
1005         if (tport == NULL)
1006                 return -ENODEV;
1007
1008         spin_lock_irqsave(&tport->tp_lock, flags);
1009         msr = tport->tp_msr;
1010         mcr = tport->tp_shadow_mcr;
1011         spin_unlock_irqrestore(&tport->tp_lock, flags);
1012
1013         result = ((mcr & TI_MCR_DTR) ? TIOCM_DTR : 0)
1014                 | ((mcr & TI_MCR_RTS) ? TIOCM_RTS : 0)
1015                 | ((mcr & TI_MCR_LOOP) ? TIOCM_LOOP : 0)
1016                 | ((msr & TI_MSR_CTS) ? TIOCM_CTS : 0)
1017                 | ((msr & TI_MSR_CD) ? TIOCM_CAR : 0)
1018                 | ((msr & TI_MSR_RI) ? TIOCM_RI : 0)
1019                 | ((msr & TI_MSR_DSR) ? TIOCM_DSR : 0);
1020
1021         dbg("%s - 0x%04X", __func__, result);
1022
1023         return result;
1024 }
1025
1026
1027 static int ti_tiocmset(struct tty_struct *tty, struct file *file,
1028         unsigned int set, unsigned int clear)
1029 {
1030         struct usb_serial_port *port = tty->driver_data;
1031         struct ti_port *tport = usb_get_serial_port_data(port);
1032         unsigned int mcr;
1033         unsigned long flags;
1034
1035         dbg("%s - port %d", __func__, port->number);
1036
1037         if (tport == NULL)
1038                 return -ENODEV;
1039
1040         spin_lock_irqsave(&tport->tp_lock, flags);
1041         mcr = tport->tp_shadow_mcr;
1042
1043         if (set & TIOCM_RTS)
1044                 mcr |= TI_MCR_RTS;
1045         if (set & TIOCM_DTR)
1046                 mcr |= TI_MCR_DTR;
1047         if (set & TIOCM_LOOP)
1048                 mcr |= TI_MCR_LOOP;
1049
1050         if (clear & TIOCM_RTS)
1051                 mcr &= ~TI_MCR_RTS;
1052         if (clear & TIOCM_DTR)
1053                 mcr &= ~TI_MCR_DTR;
1054         if (clear & TIOCM_LOOP)
1055                 mcr &= ~TI_MCR_LOOP;
1056         spin_unlock_irqrestore(&tport->tp_lock, flags);
1057
1058         return ti_set_mcr(tport, mcr);
1059 }
1060
1061
1062 static void ti_break(struct tty_struct *tty, int break_state)
1063 {
1064         struct usb_serial_port *port = tty->driver_data;
1065         struct ti_port *tport = usb_get_serial_port_data(port);
1066         int status;
1067
1068         dbg("%s - state = %d", __func__, break_state);
1069
1070         if (tport == NULL)
1071                 return;
1072
1073         ti_drain(tport, (tport->tp_closing_wait*HZ)/100, 0);
1074
1075         status = ti_write_byte(tport->tp_tdev,
1076                 tport->tp_uart_base_addr + TI_UART_OFFSET_LCR,
1077                 TI_LCR_BREAK, break_state == -1 ? TI_LCR_BREAK : 0);
1078
1079         if (status)
1080                 dbg("%s - error setting break, %d", __func__, status);
1081 }
1082
1083
1084 static void ti_interrupt_callback(struct urb *urb)
1085 {
1086         struct ti_device *tdev = urb->context;
1087         struct usb_serial_port *port;
1088         struct usb_serial *serial = tdev->td_serial;
1089         struct ti_port *tport;
1090         struct device *dev = &urb->dev->dev;
1091         unsigned char *data = urb->transfer_buffer;
1092         int length = urb->actual_length;
1093         int port_number;
1094         int function;
1095         int status = urb->status;
1096         int retval;
1097         __u8 msr;
1098
1099         dbg("%s", __func__);
1100
1101         switch (status) {
1102         case 0:
1103                 break;
1104         case -ECONNRESET:
1105         case -ENOENT:
1106         case -ESHUTDOWN:
1107                 dbg("%s - urb shutting down, %d", __func__, status);
1108                 tdev->td_urb_error = 1;
1109                 return;
1110         default:
1111                 dev_err(dev, "%s - nonzero urb status, %d\n",
1112                         __func__, status);
1113                 tdev->td_urb_error = 1;
1114                 goto exit;
1115         }
1116
1117         if (length != 2) {
1118                 dbg("%s - bad packet size, %d", __func__, length);
1119                 goto exit;
1120         }
1121
1122         if (data[0] == TI_CODE_HARDWARE_ERROR) {
1123                 dev_err(dev, "%s - hardware error, %d\n", __func__, data[1]);
1124                 goto exit;
1125         }
1126
1127         port_number = TI_GET_PORT_FROM_CODE(data[0]);
1128         function = TI_GET_FUNC_FROM_CODE(data[0]);
1129
1130         dbg("%s - port_number %d, function %d, data 0x%02X",
1131                                 __func__, port_number, function, data[1]);
1132
1133         if (port_number >= serial->num_ports) {
1134                 dev_err(dev, "%s - bad port number, %d\n",
1135                                                 __func__, port_number);
1136                 goto exit;
1137         }
1138
1139         port = serial->port[port_number];
1140
1141         tport = usb_get_serial_port_data(port);
1142         if (!tport)
1143                 goto exit;
1144
1145         switch (function) {
1146         case TI_CODE_DATA_ERROR:
1147                 dev_err(dev, "%s - DATA ERROR, port %d, data 0x%02X\n",
1148                                         __func__, port_number, data[1]);
1149                 break;
1150
1151         case TI_CODE_MODEM_STATUS:
1152                 msr = data[1];
1153                 dbg("%s - port %d, msr 0x%02X", __func__, port_number, msr);
1154                 ti_handle_new_msr(tport, msr);
1155                 break;
1156
1157         default:
1158                 dev_err(dev, "%s - unknown interrupt code, 0x%02X\n",
1159                                                         __func__, data[1]);
1160                 break;
1161         }
1162
1163 exit:
1164         retval = usb_submit_urb(urb, GFP_ATOMIC);
1165         if (retval)
1166                 dev_err(dev, "%s - resubmit interrupt urb failed, %d\n",
1167                         __func__, retval);
1168 }
1169
1170
1171 static void ti_bulk_in_callback(struct urb *urb)
1172 {
1173         struct ti_port *tport = urb->context;
1174         struct usb_serial_port *port = tport->tp_port;
1175         struct device *dev = &urb->dev->dev;
1176         int status = urb->status;
1177         int retval = 0;
1178         struct tty_struct *tty;
1179
1180         dbg("%s", __func__);
1181
1182         switch (status) {
1183         case 0:
1184                 break;
1185         case -ECONNRESET:
1186         case -ENOENT:
1187         case -ESHUTDOWN:
1188                 dbg("%s - urb shutting down, %d", __func__, status);
1189                 tport->tp_tdev->td_urb_error = 1;
1190                 wake_up_interruptible(&tport->tp_write_wait);
1191                 return;
1192         default:
1193                 dev_err(dev, "%s - nonzero urb status, %d\n",
1194                         __func__, status);
1195                 tport->tp_tdev->td_urb_error = 1;
1196                 wake_up_interruptible(&tport->tp_write_wait);
1197         }
1198
1199         if (status == -EPIPE)
1200                 goto exit;
1201
1202         if (status) {
1203                 dev_err(dev, "%s - stopping read!\n", __func__);
1204                 return;
1205         }
1206
1207         tty = tty_port_tty_get(&port->port);
1208         if (tty && urb->actual_length) {
1209                 usb_serial_debug_data(debug, dev, __func__,
1210                         urb->actual_length, urb->transfer_buffer);
1211
1212                 if (!tport->tp_is_open)
1213                         dbg("%s - port closed, dropping data", __func__);
1214                 else
1215                         ti_recv(&urb->dev->dev, tty,
1216                                                 urb->transfer_buffer,
1217                                                 urb->actual_length);
1218
1219                 spin_lock(&tport->tp_lock);
1220                 tport->tp_icount.rx += urb->actual_length;
1221                 spin_unlock(&tport->tp_lock);
1222                 tty_kref_put(tty);
1223         }
1224
1225 exit:
1226         /* continue to read unless stopping */
1227         spin_lock(&tport->tp_lock);
1228         if (tport->tp_read_urb_state == TI_READ_URB_RUNNING) {
1229                 urb->dev = port->serial->dev;
1230                 retval = usb_submit_urb(urb, GFP_ATOMIC);
1231         } else if (tport->tp_read_urb_state == TI_READ_URB_STOPPING) {
1232                 tport->tp_read_urb_state = TI_READ_URB_STOPPED;
1233         }
1234         spin_unlock(&tport->tp_lock);
1235         if (retval)
1236                 dev_err(dev, "%s - resubmit read urb failed, %d\n",
1237                         __func__, retval);
1238 }
1239
1240
1241 static void ti_bulk_out_callback(struct urb *urb)
1242 {
1243         struct ti_port *tport = urb->context;
1244         struct usb_serial_port *port = tport->tp_port;
1245         struct device *dev = &urb->dev->dev;
1246         int status = urb->status;
1247
1248         dbg("%s - port %d", __func__, port->number);
1249
1250         tport->tp_write_urb_in_use = 0;
1251
1252         switch (status) {
1253         case 0:
1254                 break;
1255         case -ECONNRESET:
1256         case -ENOENT:
1257         case -ESHUTDOWN:
1258                 dbg("%s - urb shutting down, %d", __func__, status);
1259                 tport->tp_tdev->td_urb_error = 1;
1260                 wake_up_interruptible(&tport->tp_write_wait);
1261                 return;
1262         default:
1263                 dev_err(dev, "%s - nonzero urb status, %d\n",
1264                         __func__, status);
1265                 tport->tp_tdev->td_urb_error = 1;
1266                 wake_up_interruptible(&tport->tp_write_wait);
1267         }
1268
1269         /* send any buffered data */
1270         ti_send(tport);
1271 }
1272
1273
1274 static void ti_recv(struct device *dev, struct tty_struct *tty,
1275         unsigned char *data, int length)
1276 {
1277         int cnt;
1278
1279         do {
1280                 cnt = tty_buffer_request_room(tty, length);
1281                 if (cnt < length) {
1282                         dev_err(dev, "%s - dropping data, %d bytes lost\n",
1283                                                 __func__, length - cnt);
1284                         if (cnt == 0)
1285                                 break;
1286                 }
1287                 tty_insert_flip_string(tty, data, cnt);
1288                 tty_flip_buffer_push(tty);
1289                 data += cnt;
1290                 length -= cnt;
1291         } while (length > 0);
1292
1293 }
1294
1295
1296 static void ti_send(struct ti_port *tport)
1297 {
1298         int count, result;
1299         struct usb_serial_port *port = tport->tp_port;
1300         struct tty_struct *tty = tty_port_tty_get(&port->port); /* FIXME */
1301         unsigned long flags;
1302
1303
1304         dbg("%s - port %d", __func__, port->number);
1305
1306         spin_lock_irqsave(&tport->tp_lock, flags);
1307
1308         if (tport->tp_write_urb_in_use)
1309                 goto unlock;
1310
1311         count = ti_buf_get(tport->tp_write_buf,
1312                                 port->write_urb->transfer_buffer,
1313                                 port->bulk_out_size);
1314
1315         if (count == 0)
1316                 goto unlock;
1317
1318         tport->tp_write_urb_in_use = 1;
1319
1320         spin_unlock_irqrestore(&tport->tp_lock, flags);
1321
1322         usb_serial_debug_data(debug, &port->dev, __func__, count,
1323                                         port->write_urb->transfer_buffer);
1324
1325         usb_fill_bulk_urb(port->write_urb, port->serial->dev,
1326                            usb_sndbulkpipe(port->serial->dev,
1327                                             port->bulk_out_endpointAddress),
1328                            port->write_urb->transfer_buffer, count,
1329                            ti_bulk_out_callback, tport);
1330
1331         result = usb_submit_urb(port->write_urb, GFP_ATOMIC);
1332         if (result) {
1333                 dev_err(&port->dev, "%s - submit write urb failed, %d\n",
1334                                                         __func__, result);
1335                 tport->tp_write_urb_in_use = 0;
1336                 /* TODO: reschedule ti_send */
1337         } else {
1338                 spin_lock_irqsave(&tport->tp_lock, flags);
1339                 tport->tp_icount.tx += count;
1340                 spin_unlock_irqrestore(&tport->tp_lock, flags);
1341         }
1342
1343         /* more room in the buffer for new writes, wakeup */
1344         if (tty)
1345                 tty_wakeup(tty);
1346         tty_kref_put(tty);
1347         wake_up_interruptible(&tport->tp_write_wait);
1348         return;
1349 unlock:
1350         spin_unlock_irqrestore(&tport->tp_lock, flags);
1351         tty_kref_put(tty);
1352         return;
1353 }
1354
1355
1356 static int ti_set_mcr(struct ti_port *tport, unsigned int mcr)
1357 {
1358         unsigned long flags;
1359         int status;
1360
1361         status = ti_write_byte(tport->tp_tdev,
1362                 tport->tp_uart_base_addr + TI_UART_OFFSET_MCR,
1363                 TI_MCR_RTS | TI_MCR_DTR | TI_MCR_LOOP, mcr);
1364
1365         spin_lock_irqsave(&tport->tp_lock, flags);
1366         if (!status)
1367                 tport->tp_shadow_mcr = mcr;
1368         spin_unlock_irqrestore(&tport->tp_lock, flags);
1369
1370         return status;
1371 }
1372
1373
1374 static int ti_get_lsr(struct ti_port *tport)
1375 {
1376         int size, status;
1377         struct ti_device *tdev = tport->tp_tdev;
1378         struct usb_serial_port *port = tport->tp_port;
1379         int port_number = port->number - port->serial->minor;
1380         struct ti_port_status *data;
1381
1382         dbg("%s - port %d", __func__, port->number);
1383
1384         size = sizeof(struct ti_port_status);
1385         data = kmalloc(size, GFP_KERNEL);
1386         if (!data) {
1387                 dev_err(&port->dev, "%s - out of memory\n", __func__);
1388                 return -ENOMEM;
1389         }
1390
1391         status = ti_command_in_sync(tdev, TI_GET_PORT_STATUS,
1392                 (__u8)(TI_UART1_PORT+port_number), 0, (__u8 *)data, size);
1393         if (status) {
1394                 dev_err(&port->dev,
1395                         "%s - get port status command failed, %d\n",
1396                                                         __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 tty_struct *tty, struct ti_port *tport,
1437         struct serial_struct __user *new_arg)
1438 {
1439         struct serial_struct new_serial;
1440
1441         if (copy_from_user(&new_serial, new_arg, sizeof(new_serial)))
1442                 return -EFAULT;
1443
1444         tport->tp_flags = new_serial.flags & TI_SET_SERIAL_FLAGS;
1445         tty->low_latency = (tport->tp_flags & ASYNC_LOW_LATENCY) ? 1 : 0;
1446         tport->tp_closing_wait = new_serial.closing_wait;
1447
1448         return 0;
1449 }
1450
1451
1452 static void ti_handle_new_msr(struct ti_port *tport, __u8 msr)
1453 {
1454         struct async_icount *icount;
1455         struct tty_struct *tty;
1456         unsigned long flags;
1457
1458         dbg("%s - msr 0x%02X", __func__, msr);
1459
1460         if (msr & TI_MSR_DELTA_MASK) {
1461                 spin_lock_irqsave(&tport->tp_lock, flags);
1462                 icount = &tport->tp_icount;
1463                 if (msr & TI_MSR_DELTA_CTS)
1464                         icount->cts++;
1465                 if (msr & TI_MSR_DELTA_DSR)
1466                         icount->dsr++;
1467                 if (msr & TI_MSR_DELTA_CD)
1468                         icount->dcd++;
1469                 if (msr & TI_MSR_DELTA_RI)
1470                         icount->rng++;
1471                 wake_up_interruptible(&tport->tp_msr_wait);
1472                 spin_unlock_irqrestore(&tport->tp_lock, flags);
1473         }
1474
1475         tport->tp_msr = msr & TI_MSR_MASK;
1476
1477         /* handle CTS flow control */
1478         tty = tty_port_tty_get(&tport->tp_port->port);
1479         if (tty && C_CRTSCTS(tty)) {
1480                 if (msr & TI_MSR_CTS) {
1481                         tty->hw_stopped = 0;
1482                         tty_wakeup(tty);
1483                 } else {
1484                         tty->hw_stopped = 1;
1485                 }
1486         }
1487         tty_kref_put(tty);
1488 }
1489
1490
1491 static void ti_drain(struct ti_port *tport, unsigned long timeout, int flush)
1492 {
1493         struct ti_device *tdev = tport->tp_tdev;
1494         struct usb_serial_port *port = tport->tp_port;
1495         wait_queue_t wait;
1496
1497         dbg("%s - port %d", __func__, port->number);
1498
1499         spin_lock_irq(&tport->tp_lock);
1500
1501         /* wait for data to drain from the buffer */
1502         tdev->td_urb_error = 0;
1503         init_waitqueue_entry(&wait, current);
1504         add_wait_queue(&tport->tp_write_wait, &wait);
1505         for (;;) {
1506                 set_current_state(TASK_INTERRUPTIBLE);
1507                 if (ti_buf_data_avail(tport->tp_write_buf) == 0
1508                 || timeout == 0 || signal_pending(current)
1509                 || tdev->td_urb_error
1510                 || port->serial->disconnected)  /* disconnect */
1511                         break;
1512                 spin_unlock_irq(&tport->tp_lock);
1513                 timeout = schedule_timeout(timeout);
1514                 spin_lock_irq(&tport->tp_lock);
1515         }
1516         set_current_state(TASK_RUNNING);
1517         remove_wait_queue(&tport->tp_write_wait, &wait);
1518
1519         /* flush any remaining data in the buffer */
1520         if (flush)
1521                 ti_buf_clear(tport->tp_write_buf);
1522
1523         spin_unlock_irq(&tport->tp_lock);
1524
1525         mutex_lock(&port->serial->disc_mutex);
1526         /* wait for data to drain from the device */
1527         /* wait for empty tx register, plus 20 ms */
1528         timeout += jiffies;
1529         tport->tp_lsr &= ~TI_LSR_TX_EMPTY;
1530         while ((long)(jiffies - timeout) < 0 && !signal_pending(current)
1531         && !(tport->tp_lsr&TI_LSR_TX_EMPTY) && !tdev->td_urb_error
1532         && !port->serial->disconnected) {
1533                 if (ti_get_lsr(tport))
1534                         break;
1535                 mutex_unlock(&port->serial->disc_mutex);
1536                 msleep_interruptible(20);
1537                 mutex_lock(&port->serial->disc_mutex);
1538         }
1539         mutex_unlock(&port->serial->disc_mutex);
1540 }
1541
1542
1543 static void ti_stop_read(struct ti_port *tport, struct tty_struct *tty)
1544 {
1545         unsigned long flags;
1546
1547         spin_lock_irqsave(&tport->tp_lock, flags);
1548
1549         if (tport->tp_read_urb_state == TI_READ_URB_RUNNING)
1550                 tport->tp_read_urb_state = TI_READ_URB_STOPPING;
1551
1552         spin_unlock_irqrestore(&tport->tp_lock, flags);
1553 }
1554
1555
1556 static int ti_restart_read(struct ti_port *tport, struct tty_struct *tty)
1557 {
1558         struct urb *urb;
1559         int status = 0;
1560         unsigned long flags;
1561
1562         spin_lock_irqsave(&tport->tp_lock, flags);
1563
1564         if (tport->tp_read_urb_state == TI_READ_URB_STOPPED) {
1565                 tport->tp_read_urb_state = TI_READ_URB_RUNNING;
1566                 urb = tport->tp_port->read_urb;
1567                 spin_unlock_irqrestore(&tport->tp_lock, flags);
1568                 urb->complete = ti_bulk_in_callback;
1569                 urb->context = tport;
1570                 urb->dev = tport->tp_port->serial->dev;
1571                 status = usb_submit_urb(urb, GFP_KERNEL);
1572         } else  {
1573                 tport->tp_read_urb_state = TI_READ_URB_RUNNING;
1574                 spin_unlock_irqrestore(&tport->tp_lock, flags);
1575         }
1576
1577         return status;
1578 }
1579
1580
1581 static int ti_command_out_sync(struct ti_device *tdev, __u8 command,
1582         __u16 moduleid, __u16 value, __u8 *data, int size)
1583 {
1584         int status;
1585
1586         status = usb_control_msg(tdev->td_serial->dev,
1587                 usb_sndctrlpipe(tdev->td_serial->dev, 0), command,
1588                 (USB_TYPE_VENDOR | USB_RECIP_DEVICE | USB_DIR_OUT),
1589                 value, moduleid, data, size, 1000);
1590
1591         if (status == size)
1592                 status = 0;
1593
1594         if (status > 0)
1595                 status = -ECOMM;
1596
1597         return status;
1598 }
1599
1600
1601 static int ti_command_in_sync(struct ti_device *tdev, __u8 command,
1602         __u16 moduleid, __u16 value, __u8 *data, int size)
1603 {
1604         int status;
1605
1606         status = usb_control_msg(tdev->td_serial->dev,
1607                 usb_rcvctrlpipe(tdev->td_serial->dev, 0), command,
1608                 (USB_TYPE_VENDOR | USB_RECIP_DEVICE | USB_DIR_IN),
1609                 value, moduleid, data, size, 1000);
1610
1611         if (status == size)
1612                 status = 0;
1613
1614         if (status > 0)
1615                 status = -ECOMM;
1616
1617         return status;
1618 }
1619
1620
1621 static int ti_write_byte(struct ti_device *tdev, unsigned long addr,
1622         __u8 mask, __u8 byte)
1623 {
1624         int status;
1625         unsigned int size;
1626         struct ti_write_data_bytes *data;
1627         struct device *dev = &tdev->td_serial->dev->dev;
1628
1629         dbg("%s - addr 0x%08lX, mask 0x%02X, byte 0x%02X",
1630                                         __func__, addr, mask, byte);
1631
1632         size = sizeof(struct ti_write_data_bytes) + 2;
1633         data = kmalloc(size, GFP_KERNEL);
1634         if (!data) {
1635                 dev_err(dev, "%s - out of memory\n", __func__);
1636                 return -ENOMEM;
1637         }
1638
1639         data->bAddrType = TI_RW_DATA_ADDR_XDATA;
1640         data->bDataType = TI_RW_DATA_BYTE;
1641         data->bDataCounter = 1;
1642         data->wBaseAddrHi = cpu_to_be16(addr>>16);
1643         data->wBaseAddrLo = cpu_to_be16(addr);
1644         data->bData[0] = mask;
1645         data->bData[1] = byte;
1646
1647         status = ti_command_out_sync(tdev, TI_WRITE_DATA, TI_RAM_PORT, 0,
1648                 (__u8 *)data, size);
1649
1650         if (status < 0)
1651                 dev_err(dev, "%s - failed, %d\n", __func__, status);
1652
1653         kfree(data);
1654
1655         return status;
1656 }
1657
1658 static int ti_do_download(struct usb_device *dev, int pipe,
1659                                                 u8 *buffer, int size)
1660 {
1661         int pos;
1662         u8 cs = 0;
1663         int done;
1664         struct ti_firmware_header *header;
1665         int status;
1666         int len;
1667
1668         for (pos = sizeof(struct ti_firmware_header); pos < size; pos++)
1669                 cs = (__u8)(cs + buffer[pos]);
1670
1671         header = (struct ti_firmware_header *)buffer;
1672         header->wLength = cpu_to_le16((__u16)(size
1673                                         - sizeof(struct ti_firmware_header)));
1674         header->bCheckSum = cs;
1675
1676         dbg("%s - downloading firmware", __func__);
1677         for (pos = 0; pos < size; pos += done) {
1678                 len = min(size - pos, TI_DOWNLOAD_MAX_PACKET_SIZE);
1679                 status = usb_bulk_msg(dev, pipe, buffer + pos, len,
1680                                                                 &done, 1000);
1681                 if (status)
1682                         break;
1683         }
1684         return status;
1685 }
1686
1687 static int ti_download_firmware(struct ti_device *tdev)
1688 {
1689         int status;
1690         int buffer_size;
1691         __u8 *buffer;
1692         struct usb_device *dev = tdev->td_serial->dev;
1693         unsigned int pipe = usb_sndbulkpipe(dev,
1694                 tdev->td_serial->port[0]->bulk_out_endpointAddress);
1695         const struct firmware *fw_p;
1696         char buf[32];
1697
1698         /* try ID specific firmware first, then try generic firmware */
1699         sprintf(buf, "ti_usb-v%04x-p%04x.fw", dev->descriptor.idVendor,
1700             dev->descriptor.idProduct);
1701         if ((status = request_firmware(&fw_p, buf, &dev->dev)) != 0) {
1702                 buf[0] = '\0';
1703                 if (dev->descriptor.idVendor == MTS_VENDOR_ID) {
1704                         switch (dev->descriptor.idProduct) {
1705                         case MTS_CDMA_PRODUCT_ID:
1706                                 strcpy(buf, "mts_cdma.fw");
1707                                 break;
1708                         case MTS_GSM_PRODUCT_ID:
1709                                 strcpy(buf, "mts_gsm.fw");
1710                                 break;
1711                         case MTS_EDGE_PRODUCT_ID:
1712                                 strcpy(buf, "mts_edge.fw");
1713                                 break;
1714                         }
1715                 }
1716                 if (buf[0] == '\0') {
1717                         if (tdev->td_is_3410)
1718                                 strcpy(buf, "ti_3410.fw");
1719                         else
1720                                 strcpy(buf, "ti_5052.fw");
1721                 }
1722                 status = request_firmware(&fw_p, buf, &dev->dev);
1723         }
1724         if (status) {
1725                 dev_err(&dev->dev, "%s - firmware not found\n", __func__);
1726                 return -ENOENT;
1727         }
1728         if (fw_p->size > TI_FIRMWARE_BUF_SIZE) {
1729                 dev_err(&dev->dev, "%s - firmware too large\n", __func__);
1730                 return -ENOENT;
1731         }
1732
1733         buffer_size = TI_FIRMWARE_BUF_SIZE + sizeof(struct ti_firmware_header);
1734         buffer = kmalloc(buffer_size, GFP_KERNEL);
1735         if (buffer) {
1736                 memcpy(buffer, fw_p->data, fw_p->size);
1737                 memset(buffer + fw_p->size, 0xff, buffer_size - fw_p->size);
1738                 status = ti_do_download(dev, pipe, buffer, fw_p->size);
1739                 kfree(buffer);
1740         } else {
1741                 status = -ENOMEM;
1742         }
1743         release_firmware(fw_p);
1744         if (status) {
1745                 dev_err(&dev->dev, "%s - error downloading firmware, %d\n",
1746                                                         __func__, status);
1747                 return status;
1748         }
1749
1750         dbg("%s - download successful", __func__);
1751
1752         return 0;
1753 }
1754
1755
1756 /* Circular Buffer Functions */
1757
1758 /*
1759  * ti_buf_alloc
1760  *
1761  * Allocate a circular buffer and all associated memory.
1762  */
1763
1764 static struct circ_buf *ti_buf_alloc(void)
1765 {
1766         struct circ_buf *cb;
1767
1768         cb = kmalloc(sizeof(struct circ_buf), GFP_KERNEL);
1769         if (cb == NULL)
1770                 return NULL;
1771
1772         cb->buf = kmalloc(TI_WRITE_BUF_SIZE, GFP_KERNEL);
1773         if (cb->buf == NULL) {
1774                 kfree(cb);
1775                 return NULL;
1776         }
1777
1778         ti_buf_clear(cb);
1779
1780         return cb;
1781 }
1782
1783
1784 /*
1785  * ti_buf_free
1786  *
1787  * Free the buffer and all associated memory.
1788  */
1789
1790 static void ti_buf_free(struct circ_buf *cb)
1791 {
1792         kfree(cb->buf);
1793         kfree(cb);
1794 }
1795
1796
1797 /*
1798  * ti_buf_clear
1799  *
1800  * Clear out all data in the circular buffer.
1801  */
1802
1803 static void ti_buf_clear(struct circ_buf *cb)
1804 {
1805         cb->head = cb->tail = 0;
1806 }
1807
1808
1809 /*
1810  * ti_buf_data_avail
1811  *
1812  * Return the number of bytes of data available in the circular
1813  * buffer.
1814  */
1815
1816 static int ti_buf_data_avail(struct circ_buf *cb)
1817 {
1818         return CIRC_CNT(cb->head, cb->tail, TI_WRITE_BUF_SIZE);
1819 }
1820
1821
1822 /*
1823  * ti_buf_space_avail
1824  *
1825  * Return the number of bytes of space available in the circular
1826  * buffer.
1827  */
1828
1829 static int ti_buf_space_avail(struct circ_buf *cb)
1830 {
1831         return CIRC_SPACE(cb->head, cb->tail, TI_WRITE_BUF_SIZE);
1832 }
1833
1834
1835 /*
1836  * ti_buf_put
1837  *
1838  * Copy data data from a user buffer and put it into the circular buffer.
1839  * Restrict to the amount of space available.
1840  *
1841  * Return the number of bytes copied.
1842  */
1843
1844 static int ti_buf_put(struct circ_buf *cb, const char *buf, int count)
1845 {
1846         int c, ret = 0;
1847
1848         while (1) {
1849                 c = CIRC_SPACE_TO_END(cb->head, cb->tail, TI_WRITE_BUF_SIZE);
1850                 if (count < c)
1851                         c = count;
1852                 if (c <= 0)
1853                         break;
1854                 memcpy(cb->buf + cb->head, buf, c);
1855                 cb->head = (cb->head + c) & (TI_WRITE_BUF_SIZE-1);
1856                 buf += c;
1857                 count -= c;
1858                 ret += c;
1859         }
1860
1861         return ret;
1862 }
1863
1864
1865 /*
1866  * ti_buf_get
1867  *
1868  * Get data from the circular buffer and copy to the given buffer.
1869  * Restrict to the amount of data available.
1870  *
1871  * Return the number of bytes copied.
1872  */
1873
1874 static int ti_buf_get(struct circ_buf *cb, char *buf, int count)
1875 {
1876         int c, ret = 0;
1877
1878         while (1) {
1879                 c = CIRC_CNT_TO_END(cb->head, cb->tail, TI_WRITE_BUF_SIZE);
1880                 if (count < c)
1881                         c = count;
1882                 if (c <= 0)
1883                         break;
1884                 memcpy(buf, cb->buf + cb->tail, c);
1885                 cb->tail = (cb->tail + c) & (TI_WRITE_BUF_SIZE-1);
1886                 buf += c;
1887                 count -= c;
1888                 ret += c;
1889         }
1890
1891         return ret;
1892 }