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 tty_struct *tty, struct usb_serial_port *port,
 104                 struct file *file);
 105 static int ti_write(struct tty_struct *tty, struct usb_serial_port *port,
 106                 const unsigned char *data, int count);
 107 static int ti_write_room(struct tty_struct *tty);
 108 static int ti_chars_in_buffer(struct tty_struct *tty);
 109 static void ti_throttle(struct tty_struct *tty);
 110 static void ti_unthrottle(struct tty_struct *tty);
 111 static int ti_ioctl(struct tty_struct *tty, struct file *file,
 112                 unsigned int cmd, unsigned long arg);
 113 static void ti_set_termios(struct tty_struct *tty,
 114                 struct usb_serial_port *port, struct ktermios *old_termios);
 115 static int ti_tiocmget(struct tty_struct *tty, struct file *file);
 116 static int ti_tiocmset(struct tty_struct *tty, struct file *file,
 117                 unsigned int set, unsigned int clear);
 118 static void ti_break(struct tty_struct *tty, int break_state);
 119 static void ti_interrupt_callback(struct urb *urb);
 120 static void ti_bulk_in_callback(struct urb *urb);
 121 static void ti_bulk_out_callback(struct urb *urb);
 122
 123 static void ti_recv(struct device *dev, struct tty_struct *tty,
 124         unsigned char *data, int length);
 125 static void ti_send(struct ti_port *tport);
 126 static int ti_set_mcr(struct ti_port *tport, unsigned int mcr);
 127 static int ti_get_lsr(struct ti_port *tport);
 128 static int ti_get_serial_info(struct ti_port *tport,
 129         struct serial_struct __user *ret_arg);
 130 static int ti_set_serial_info(struct tty_struct *tty, struct ti_port *tport,
 131         struct serial_struct __user *new_arg);
 132 static void ti_handle_new_msr(struct ti_port *tport, __u8 msr);
 133
 134 static void ti_drain(struct ti_port *tport, unsigned long timeout, int flush);
 135
 136 static void ti_stop_read(struct ti_port *tport, struct tty_struct *tty);
 137 static int ti_restart_read(struct ti_port *tport, struct tty_struct *tty);
 138
 139 static int ti_command_out_sync(struct ti_device *tdev, __u8 command,
 140         __u16 moduleid, __u16 value, __u8 *data, int size);
 141 static int ti_command_in_sync(struct ti_device *tdev, __u8 command,
 142         __u16 moduleid, __u16 value, __u8 *data, int size);
 143
 144 static int ti_write_byte(struct ti_device *tdev, unsigned long addr,
 145         __u8 mask, __u8 byte);
 146
 147 static int ti_download_firmware(struct ti_device *tdev);
 148
 149 /* circular buffer */
 150 static struct circ_buf *ti_buf_alloc(void);
 151 static void ti_buf_free(struct circ_buf *cb);
 152 static void ti_buf_clear(struct circ_buf *cb);
 153 static int ti_buf_data_avail(struct circ_buf *cb);
 154 static int ti_buf_space_avail(struct circ_buf *cb);
 155 static int ti_buf_put(struct circ_buf *cb, const char *buf, int count);
 156 static int ti_buf_get(struct circ_buf *cb, char *buf, int count);
 157
 158
 159 /* Data */
 160
 161 /* module parameters */
 162 static int debug;
 163 static int closing_wait = TI_DEFAULT_CLOSING_WAIT;
 164 static ushort vendor_3410[TI_EXTRA_VID_PID_COUNT];
 165 static unsigned int vendor_3410_count;
 166 static ushort product_3410[TI_EXTRA_VID_PID_COUNT];
 167 static unsigned int product_3410_count;
 168 static ushort vendor_5052[TI_EXTRA_VID_PID_COUNT];
 169 static unsigned int vendor_5052_count;
 170 static ushort product_5052[TI_EXTRA_VID_PID_COUNT];
 171 static unsigned int product_5052_count;
 172
 173 /* supported devices */
 174 /* the array dimension is the number of default entries plus */
 175 /* TI_EXTRA_VID_PID_COUNT user defined entries plus 1 terminating */
 176 /* null entry */
 177 static struct usb_device_id ti_id_table_3410[10+TI_EXTRA_VID_PID_COUNT+1] = {
 178         { USB_DEVICE(TI_VENDOR_ID, TI_3410_PRODUCT_ID) },
 179         { USB_DEVICE(TI_VENDOR_ID, TI_3410_EZ430_ID) },
 180         { USB_DEVICE(MTS_VENDOR_ID, MTS_GSM_NO_FW_PRODUCT_ID) },
 181         { USB_DEVICE(MTS_VENDOR_ID, MTS_CDMA_NO_FW_PRODUCT_ID) },
 182         { USB_DEVICE(MTS_VENDOR_ID, MTS_CDMA_PRODUCT_ID) },
 183         { USB_DEVICE(MTS_VENDOR_ID, MTS_GSM_PRODUCT_ID) },
 184         { USB_DEVICE(MTS_VENDOR_ID, MTS_EDGE_PRODUCT_ID) },
 185         { USB_DEVICE(IBM_VENDOR_ID, IBM_4543_PRODUCT_ID) },
 186         { USB_DEVICE(IBM_VENDOR_ID, IBM_454B_PRODUCT_ID) },
 187         { USB_DEVICE(IBM_VENDOR_ID, IBM_454C_PRODUCT_ID) },
 188 };
 189
 190 static struct usb_device_id ti_id_table_5052[5+TI_EXTRA_VID_PID_COUNT+1] = {
 191         { USB_DEVICE(TI_VENDOR_ID, TI_5052_BOOT_PRODUCT_ID) },
 192         { USB_DEVICE(TI_VENDOR_ID, TI_5152_BOOT_PRODUCT_ID) },
 193         { USB_DEVICE(TI_VENDOR_ID, TI_5052_EEPROM_PRODUCT_ID) },
 194         { USB_DEVICE(TI_VENDOR_ID, TI_5052_FIRMWARE_PRODUCT_ID) },
 195         { USB_DEVICE(IBM_VENDOR_ID, IBM_4543_PRODUCT_ID) },
 196 };
 197
 198 static struct usb_device_id ti_id_table_combined[14+2*TI_EXTRA_VID_PID_COUNT+1] = {
 199         { USB_DEVICE(TI_VENDOR_ID, TI_3410_PRODUCT_ID) },
 200         { USB_DEVICE(TI_VENDOR_ID, TI_3410_EZ430_ID) },
 201         { USB_DEVICE(MTS_VENDOR_ID, MTS_GSM_NO_FW_PRODUCT_ID) },
 202         { USB_DEVICE(MTS_VENDOR_ID, MTS_CDMA_NO_FW_PRODUCT_ID) },
 203         { USB_DEVICE(MTS_VENDOR_ID, MTS_CDMA_PRODUCT_ID) },
 204         { USB_DEVICE(MTS_VENDOR_ID, MTS_GSM_PRODUCT_ID) },
 205         { USB_DEVICE(MTS_VENDOR_ID, MTS_EDGE_PRODUCT_ID) },
 206         { USB_DEVICE(TI_VENDOR_ID, TI_5052_BOOT_PRODUCT_ID) },
 207         { USB_DEVICE(TI_VENDOR_ID, TI_5152_BOOT_PRODUCT_ID) },
 208         { USB_DEVICE(TI_VENDOR_ID, TI_5052_EEPROM_PRODUCT_ID) },
 209         { USB_DEVICE(TI_VENDOR_ID, TI_5052_FIRMWARE_PRODUCT_ID) },
 210         { USB_DEVICE(IBM_VENDOR_ID, IBM_4543_PRODUCT_ID) },
 211         { USB_DEVICE(IBM_VENDOR_ID, IBM_454B_PRODUCT_ID) },
 212         { USB_DEVICE(IBM_VENDOR_ID, IBM_454C_PRODUCT_ID) },
 213         { }
 214 };
 215
 216 static struct usb_driver ti_usb_driver = {
 217         .name                   = "ti_usb_3410_5052",
 218         .probe                  = usb_serial_probe,
 219         .disconnect             = usb_serial_disconnect,
 220         .id_table               = ti_id_table_combined,
 221         .no_dynamic_id =        1,
 222 };
 223
 224 static struct usb_serial_driver ti_1port_device = {
 225         .driver = {
 226                 .owner          = THIS_MODULE,
 227                 .name           = "ti_usb_3410_5052_1",
 228         },
 229         .description            = "TI USB 3410 1 port adapter",
 230         .usb_driver             = &ti_usb_driver,
 231         .id_table               = ti_id_table_3410,
 232         .num_ports              = 1,
 233         .attach                 = ti_startup,
 234         .shutdown               = ti_shutdown,
 235         .open                   = ti_open,
 236         .close                  = ti_close,
 237         .write                  = ti_write,
 238         .write_room             = ti_write_room,
 239         .chars_in_buffer        = ti_chars_in_buffer,
 240         .throttle               = ti_throttle,
 241         .unthrottle             = ti_unthrottle,
 242         .ioctl                  = ti_ioctl,
 243         .set_termios            = ti_set_termios,
 244         .tiocmget               = ti_tiocmget,
 245         .tiocmset               = ti_tiocmset,
 246         .break_ctl              = ti_break,
 247         .read_int_callback      = ti_interrupt_callback,
 248         .read_bulk_callback     = ti_bulk_in_callback,
 249         .write_bulk_callback    = ti_bulk_out_callback,
 250 };
 251
 252 static struct usb_serial_driver ti_2port_device = {
 253         .driver = {
 254                 .owner          = THIS_MODULE,
 255                 .name           = "ti_usb_3410_5052_2",
 256         },
 257         .description            = "TI USB 5052 2 port adapter",
 258         .usb_driver             = &ti_usb_driver,
 259         .id_table               = ti_id_table_5052,
 260         .num_ports              = 2,
 261         .attach                 = ti_startup,
 262         .shutdown               = ti_shutdown,
 263         .open                   = ti_open,
 264         .close                  = ti_close,
 265         .write                  = ti_write,
 266         .write_room             = ti_write_room,
 267         .chars_in_buffer        = ti_chars_in_buffer,
 268         .throttle               = ti_throttle,
 269         .unthrottle             = ti_unthrottle,
 270         .ioctl                  = ti_ioctl,
 271         .set_termios            = ti_set_termios,
 272         .tiocmget               = ti_tiocmget,
 273         .tiocmset               = ti_tiocmset,
 274         .break_ctl              = ti_break,
 275         .read_int_callback      = ti_interrupt_callback,
 276         .read_bulk_callback     = ti_bulk_in_callback,
 277         .write_bulk_callback    = ti_bulk_out_callback,
 278 };
 279
 280
 281 /* Module */
 282
 283 MODULE_AUTHOR(TI_DRIVER_AUTHOR);
 284 MODULE_DESCRIPTION(TI_DRIVER_DESC);
 285 MODULE_VERSION(TI_DRIVER_VERSION);
 286 MODULE_LICENSE("GPL");
 287
 288 MODULE_FIRMWARE("ti_3410.fw");
 289 MODULE_FIRMWARE("ti_5052.fw");
 290 MODULE_FIRMWARE("mts_cdma.fw");
 291 MODULE_FIRMWARE("mts_gsm.fw");
 292 MODULE_FIRMWARE("mts_edge.fw");
 293
 294 module_param(debug, bool, S_IRUGO | S_IWUSR);
 295 MODULE_PARM_DESC(debug, "Enable debugging, 0=no, 1=yes");
 296
 297 module_param(closing_wait, int, S_IRUGO | S_IWUSR);
 298 MODULE_PARM_DESC(closing_wait,
 299     "Maximum wait for data to drain in close, in .01 secs, default is 4000");
 300
 301 module_param_array(vendor_3410, ushort, &vendor_3410_count, S_IRUGO);
 302 MODULE_PARM_DESC(vendor_3410,
 303                 "Vendor ids for 3410 based devices, 1-5 short integers");
 304 module_param_array(product_3410, ushort, &product_3410_count, S_IRUGO);
 305 MODULE_PARM_DESC(product_3410,
 306                 "Product ids for 3410 based devices, 1-5 short integers");
 307 module_param_array(vendor_5052, ushort, &vendor_5052_count, S_IRUGO);
 308 MODULE_PARM_DESC(vendor_5052,
 309                 "Vendor ids for 5052 based devices, 1-5 short integers");
 310 module_param_array(product_5052, ushort, &product_5052_count, S_IRUGO);
 311 MODULE_PARM_DESC(product_5052,
 312                 "Product ids for 5052 based devices, 1-5 short integers");
 313
 314 MODULE_DEVICE_TABLE(usb, ti_id_table_combined);
 315
 316
 317 /* Functions */
 318
 319 static int __init ti_init(void)
 320 {
 321         int i, j, c;
 322         int ret;
 323
 324         /* insert extra vendor and product ids */
 325         c = ARRAY_SIZE(ti_id_table_combined) - 2 * TI_EXTRA_VID_PID_COUNT - 1;
 326         j = ARRAY_SIZE(ti_id_table_3410) - TI_EXTRA_VID_PID_COUNT - 1;
 327         for (i = 0; i < min(vendor_3410_count, product_3410_count); i++, j++, c++) {
 328                 ti_id_table_3410[j].idVendor = vendor_3410[i];
 329                 ti_id_table_3410[j].idProduct = product_3410[i];
 330                 ti_id_table_3410[j].match_flags = USB_DEVICE_ID_MATCH_DEVICE;
 331                 ti_id_table_combined[c].idVendor = vendor_3410[i];
 332                 ti_id_table_combined[c].idProduct = product_3410[i];
 333                 ti_id_table_combined[c].match_flags = USB_DEVICE_ID_MATCH_DEVICE;
 334         }
 335         j = ARRAY_SIZE(ti_id_table_5052) - TI_EXTRA_VID_PID_COUNT - 1;
 336         for (i = 0; i < min(vendor_5052_count, product_5052_count); i++, j++, c++) {
 337                 ti_id_table_5052[j].idVendor = vendor_5052[i];
 338                 ti_id_table_5052[j].idProduct = product_5052[i];
 339                 ti_id_table_5052[j].match_flags = USB_DEVICE_ID_MATCH_DEVICE;
 340                 ti_id_table_combined[c].idVendor = vendor_5052[i];
 341                 ti_id_table_combined[c].idProduct = product_5052[i];
 342                 ti_id_table_combined[c].match_flags = USB_DEVICE_ID_MATCH_DEVICE;
 343         }
 344
 345         ret = usb_serial_register(&ti_1port_device);
 346         if (ret)
 347                 goto failed_1port;
 348         ret = usb_serial_register(&ti_2port_device);
 349         if (ret)
 350                 goto failed_2port;
 351
 352         ret = usb_register(&ti_usb_driver);
 353         if (ret)
 354                 goto failed_usb;
 355
 356         printk(KERN_INFO KBUILD_MODNAME ": " TI_DRIVER_VERSION ":"
 357                TI_DRIVER_DESC "\n");
 358
 359         return 0;
 360
 361 failed_usb:
 362         usb_serial_deregister(&ti_2port_device);
 363 failed_2port:
 364         usb_serial_deregister(&ti_1port_device);
 365 failed_1port:
 366         return ret;
 367 }
 368
 369
 370 static void __exit ti_exit(void)
 371 {
 372         usb_serial_deregister(&ti_1port_device);
 373         usb_serial_deregister(&ti_2port_device);
 374         usb_deregister(&ti_usb_driver);
 375 }
 376
 377
 378 module_init(ti_init);
 379 module_exit(ti_exit);
 380
 381
 382 static int ti_startup(struct usb_serial *serial)
 383 {
 384         struct ti_device *tdev;
 385         struct ti_port *tport;
 386         struct usb_device *dev = serial->dev;
 387         int status;
 388         int i;
 389
 390
 391         dbg("%s - product 0x%4X, num configurations %d, configuration value %d",
 392             __func__, le16_to_cpu(dev->descriptor.idProduct),
 393             dev->descriptor.bNumConfigurations,
 394             dev->actconfig->desc.bConfigurationValue);
 395
 396         /* create device structure */
 397         tdev = kzalloc(sizeof(struct ti_device), GFP_KERNEL);
 398         if (tdev == NULL) {
 399                 dev_err(&dev->dev, "%s - out of memory\n", __func__);
 400                 return -ENOMEM;
 401         }
 402         mutex_init(&tdev->td_open_close_lock);
 403         tdev->td_serial = serial;
 404         usb_set_serial_data(serial, tdev);
 405
 406         /* determine device type */
 407         if (usb_match_id(serial->interface, ti_id_table_3410))
 408                 tdev->td_is_3410 = 1;
 409         dbg("%s - device type is %s", __func__,
 410                                 tdev->td_is_3410 ? "3410" : "5052");
 411
 412         /* if we have only 1 configuration, download firmware */
 413         if (dev->descriptor.bNumConfigurations == 1) {
 414                 if ((status = ti_download_firmware(tdev)) != 0)
 415                         goto free_tdev;
 416
 417                 /* 3410 must be reset, 5052 resets itself */
 418                 if (tdev->td_is_3410) {
 419                         msleep_interruptible(100);
 420                         usb_reset_device(dev);
 421                 }
 422
 423                 status = -ENODEV;
 424                 goto free_tdev;
 425         }
 426
 427         /* the second configuration must be set */
 428         if (dev->actconfig->desc.bConfigurationValue == TI_BOOT_CONFIG) {
 429                 status = usb_driver_set_configuration(dev, TI_ACTIVE_CONFIG);
 430                 status = status ? status : -ENODEV;
 431                 goto free_tdev;
 432         }
 433
 434         /* set up port structures */
 435         for (i = 0; i < serial->num_ports; ++i) {
 436                 tport = kzalloc(sizeof(struct ti_port), GFP_KERNEL);
 437                 if (tport == NULL) {
 438                         dev_err(&dev->dev, "%s - out of memory\n", __func__);
 439                         status = -ENOMEM;
 440                         goto free_tports;
 441                 }
 442                 spin_lock_init(&tport->tp_lock);
 443                 tport->tp_uart_base_addr = (i == 0 ?
 444                                 TI_UART1_BASE_ADDR : TI_UART2_BASE_ADDR);
 445                 tport->tp_closing_wait = closing_wait;
 446                 init_waitqueue_head(&tport->tp_msr_wait);
 447                 init_waitqueue_head(&tport->tp_write_wait);
 448                 tport->tp_write_buf = ti_buf_alloc();
 449                 if (tport->tp_write_buf == NULL) {
 450                         dev_err(&dev->dev, "%s - out of memory\n", __func__);
 451                         kfree(tport);
 452                         status = -ENOMEM;
 453                         goto free_tports;
 454                 }
 455                 tport->tp_port = serial->port[i];
 456                 tport->tp_tdev = tdev;
 457                 usb_set_serial_port_data(serial->port[i], tport);
 458                 tport->tp_uart_mode = 0;        /* default is RS232 */
 459         }
 460
 461         return 0;
 462
 463 free_tports:
 464         for (--i; i >= 0; --i) {
 465                 tport = usb_get_serial_port_data(serial->port[i]);
 466                 ti_buf_free(tport->tp_write_buf);
 467                 kfree(tport);
 468                 usb_set_serial_port_data(serial->port[i], NULL);
 469         }
 470 free_tdev:
 471         kfree(tdev);
 472         usb_set_serial_data(serial, NULL);
 473         return status;
 474 }
 475
 476
 477 static void ti_shutdown(struct usb_serial *serial)
 478 {
 479         int i;
 480         struct ti_device *tdev = usb_get_serial_data(serial);
 481         struct ti_port *tport;
 482
 483         dbg("%s", __func__);
 484
 485         for (i = 0; i < serial->num_ports; ++i) {
 486                 tport = usb_get_serial_port_data(serial->port[i]);
 487                 if (tport) {
 488                         ti_buf_free(tport->tp_write_buf);
 489                         kfree(tport);
 490                         usb_set_serial_port_data(serial->port[i], NULL);
 491                 }
 492         }
 493
 494         kfree(tdev);
 495         usb_set_serial_data(serial, NULL);
 496 }
 497
 498
 499 static int ti_open(struct tty_struct *tty,
 500                         struct usb_serial_port *port, struct file *file)
 501 {
 502         struct ti_port *tport = usb_get_serial_port_data(port);
 503         struct ti_device *tdev;
 504         struct usb_device *dev;
 505         struct urb *urb;
 506         int port_number;
 507         int status;
 508         __u16 open_settings = (__u8)(TI_PIPE_MODE_CONTINOUS |
 509                              TI_PIPE_TIMEOUT_ENABLE |
 510                              (TI_TRANSFER_TIMEOUT << 2));
 511
 512         dbg("%s - port %d", __func__, port->number);
 513
 514         if (tport == NULL)
 515                 return -ENODEV;
 516
 517         dev = port->serial->dev;
 518         tdev = tport->tp_tdev;
 519
 520         /* only one open on any port on a device at a time */
 521         if (mutex_lock_interruptible(&tdev->td_open_close_lock))
 522                 return -ERESTARTSYS;
 523
 524         port_number = port->number - port->serial->minor;
 525
 526         memset(&(tport->tp_icount), 0x00, sizeof(tport->tp_icount));
 527
 528         tport->tp_msr = 0;
 529         tport->tp_shadow_mcr |= (TI_MCR_RTS | TI_MCR_DTR);
 530
 531         /* start interrupt urb the first time a port is opened on this device */
 532         if (tdev->td_open_port_count == 0) {
 533                 dbg("%s - start interrupt in urb", __func__);
 534                 urb = tdev->td_serial->port[0]->interrupt_in_urb;
 535                 if (!urb) {
 536                         dev_err(&port->dev, "%s - no interrupt urb\n",
 537                                                                 __func__);
 538                         status = -EINVAL;
 539                         goto release_lock;
 540                 }
 541                 urb->complete = ti_interrupt_callback;
 542                 urb->context = tdev;
 543                 urb->dev = dev;
 544                 status = usb_submit_urb(urb, GFP_KERNEL);
 545                 if (status) {
 546                         dev_err(&port->dev,
 547                                 "%s - submit interrupt urb failed, %d\n",
 548                                         __func__, status);
 549                         goto release_lock;
 550                 }
 551         }
 552
 553         if (tty)
 554                 ti_set_termios(tty, port, tty->termios);
 555
 556         dbg("%s - sending TI_OPEN_PORT", __func__);
 557         status = ti_command_out_sync(tdev, TI_OPEN_PORT,
 558                 (__u8)(TI_UART1_PORT + port_number), open_settings, NULL, 0);
 559         if (status) {
 560                 dev_err(&port->dev, "%s - cannot send open command, %d\n",
 561                                                         __func__, status);
 562                 goto unlink_int_urb;
 563         }
 564
 565         dbg("%s - sending TI_START_PORT", __func__);
 566         status = ti_command_out_sync(tdev, TI_START_PORT,
 567                 (__u8)(TI_UART1_PORT + port_number), 0, NULL, 0);
 568         if (status) {
 569                 dev_err(&port->dev, "%s - cannot send start command, %d\n",
 570                                                         __func__, status);
 571                 goto unlink_int_urb;
 572         }
 573
 574         dbg("%s - sending TI_PURGE_PORT", __func__);
 575         status = ti_command_out_sync(tdev, TI_PURGE_PORT,
 576                 (__u8)(TI_UART1_PORT + port_number), TI_PURGE_INPUT, NULL, 0);
 577         if (status) {
 578                 dev_err(&port->dev, "%s - cannot clear input buffers, %d\n",
 579                                                         __func__, status);
 580                 goto unlink_int_urb;
 581         }
 582         status = ti_command_out_sync(tdev, TI_PURGE_PORT,
 583                 (__u8)(TI_UART1_PORT + port_number), TI_PURGE_OUTPUT, NULL, 0);
 584         if (status) {
 585                 dev_err(&port->dev, "%s - cannot clear output buffers, %d\n",
 586                                                         __func__, status);
 587                 goto unlink_int_urb;
 588         }
 589
 590         /* reset the data toggle on the bulk endpoints to work around bug in
 591          * host controllers where things get out of sync some times */
 592         usb_clear_halt(dev, port->write_urb->pipe);
 593         usb_clear_halt(dev, port->read_urb->pipe);
 594
 595         if (tty)
 596                 ti_set_termios(tty, port, tty->termios);
 597
 598         dbg("%s - sending TI_OPEN_PORT (2)", __func__);
 599         status = ti_command_out_sync(tdev, TI_OPEN_PORT,
 600                 (__u8)(TI_UART1_PORT + port_number), open_settings, NULL, 0);
 601         if (status) {
 602                 dev_err(&port->dev, "%s - cannot send open command (2), %d\n",
 603                                                         __func__, status);
 604                 goto unlink_int_urb;
 605         }
 606
 607         dbg("%s - sending TI_START_PORT (2)", __func__);
 608         status = ti_command_out_sync(tdev, TI_START_PORT,
 609                 (__u8)(TI_UART1_PORT + port_number), 0, NULL, 0);
 610         if (status) {
 611                 dev_err(&port->dev, "%s - cannot send start command (2), %d\n",
 612                                                         __func__, status);
 613                 goto unlink_int_urb;
 614         }
 615
 616         /* start read urb */
 617         dbg("%s - start read urb", __func__);
 618         urb = port->read_urb;
 619         if (!urb) {
 620                 dev_err(&port->dev, "%s - no read urb\n", __func__);
 621                 status = -EINVAL;
 622                 goto unlink_int_urb;
 623         }
 624         tport->tp_read_urb_state = TI_READ_URB_RUNNING;
 625         urb->complete = ti_bulk_in_callback;
 626         urb->context = tport;
 627         urb->dev = dev;
 628         status = usb_submit_urb(urb, GFP_KERNEL);
 629         if (status) {
 630                 dev_err(&port->dev, "%s - submit read urb failed, %d\n",
 631                                                         __func__, status);
 632                 goto unlink_int_urb;
 633         }
 634
 635         tport->tp_is_open = 1;
 636         ++tdev->td_open_port_count;
 637
 638         goto release_lock;
 639
 640 unlink_int_urb:
 641         if (tdev->td_open_port_count == 0)
 642                 usb_kill_urb(port->serial->port[0]->interrupt_in_urb);
 643 release_lock:
 644         mutex_unlock(&tdev->td_open_close_lock);
 645         dbg("%s - exit %d", __func__, status);
 646         return status;
 647 }
 648
 649
 650 static void ti_close(struct tty_struct *tty, struct usb_serial_port *port,
 651                                                         struct file *file)
 652 {
 653         struct ti_device *tdev;
 654         struct ti_port *tport;
 655         int port_number;
 656         int status;
 657         int do_unlock;
 658
 659         dbg("%s - port %d", __func__, port->number);
 660
 661         tdev = usb_get_serial_data(port->serial);
 662         tport = usb_get_serial_port_data(port);
 663         if (tdev == NULL || tport == NULL)
 664                 return;
 665
 666         tport->tp_is_open = 0;
 667
 668         ti_drain(tport, (tport->tp_closing_wait*HZ)/100, 1);
 669
 670         usb_kill_urb(port->read_urb);
 671         usb_kill_urb(port->write_urb);
 672         tport->tp_write_urb_in_use = 0;
 673
 674         port_number = port->number - port->serial->minor;
 675
 676         dbg("%s - sending TI_CLOSE_PORT", __func__);
 677         status = ti_command_out_sync(tdev, TI_CLOSE_PORT,
 678                      (__u8)(TI_UART1_PORT + port_number), 0, NULL, 0);
 679         if (status)
 680                 dev_err(&port->dev,
 681                         "%s - cannot send close port command, %d\n"
 682                                                         , __func__, status);
 683
 684         /* if mutex_lock is interrupted, continue anyway */
 685         do_unlock = !mutex_lock_interruptible(&tdev->td_open_close_lock);
 686         --tport->tp_tdev->td_open_port_count;
 687         if (tport->tp_tdev->td_open_port_count <= 0) {
 688                 /* last port is closed, shut down interrupt urb */
 689                 usb_kill_urb(port->serial->port[0]->interrupt_in_urb);
 690                 tport->tp_tdev->td_open_port_count = 0;
 691         }
 692         if (do_unlock)
 693                 mutex_unlock(&tdev->td_open_close_lock);
 694
 695         dbg("%s - exit", __func__);
 696 }
 697
 698
 699 static int ti_write(struct tty_struct *tty, struct usb_serial_port *port,
 700                         const unsigned char *data, int count)
 701 {
 702         struct ti_port *tport = usb_get_serial_port_data(port);
 703         unsigned long flags;
 704
 705         dbg("%s - port %d", __func__, port->number);
 706
 707         if (count == 0) {
 708                 dbg("%s - write request of 0 bytes", __func__);
 709                 return 0;
 710         }
 711
 712         if (tport == NULL || !tport->tp_is_open)
 713                 return -ENODEV;
 714
 715         spin_lock_irqsave(&tport->tp_lock, flags);
 716         count = ti_buf_put(tport->tp_write_buf, data, count);
 717         spin_unlock_irqrestore(&tport->tp_lock, flags);
 718
 719         ti_send(tport);
 720
 721         return count;
 722 }
 723
 724
 725 static int ti_write_room(struct tty_struct *tty)
 726 {
 727         struct usb_serial_port *port = tty->driver_data;
 728         struct ti_port *tport = usb_get_serial_port_data(port);
 729         int room = 0;
 730         unsigned long flags;
 731
 732         dbg("%s - port %d", __func__, port->number);
 733
 734         if (tport == NULL)
 735                 return -ENODEV;
 736
 737         spin_lock_irqsave(&tport->tp_lock, flags);
 738         room = ti_buf_space_avail(tport->tp_write_buf);
 739         spin_unlock_irqrestore(&tport->tp_lock, flags);
 740
 741         dbg("%s - returns %d", __func__, room);
 742         return room;
 743 }
 744
 745
 746 static int ti_chars_in_buffer(struct tty_struct *tty)
 747 {
 748         struct usb_serial_port *port = tty->driver_data;
 749         struct ti_port *tport = usb_get_serial_port_data(port);
 750         int chars = 0;
 751         unsigned long flags;
 752
 753         dbg("%s - port %d", __func__, port->number);
 754
 755         if (tport == NULL)
 756                 return -ENODEV;
 757
 758         spin_lock_irqsave(&tport->tp_lock, flags);
 759         chars = ti_buf_data_avail(tport->tp_write_buf);
 760         spin_unlock_irqrestore(&tport->tp_lock, flags);
 761
 762         dbg("%s - returns %d", __func__, chars);
 763         return chars;
 764 }
 765
 766
 767 static void ti_throttle(struct tty_struct *tty)
 768 {
 769         struct usb_serial_port *port = tty->driver_data;
 770         struct ti_port *tport = usb_get_serial_port_data(port);
 771
 772         dbg("%s - port %d", __func__, port->number);
 773
 774         if (tport == NULL)
 775                 return;
 776
 777         if (I_IXOFF(tty) || C_CRTSCTS(tty))
 778                 ti_stop_read(tport, tty);
 779
 780 }
 781
 782
 783 static void ti_unthrottle(struct tty_struct *tty)
 784 {
 785         struct usb_serial_port *port = tty->driver_data;
 786         struct ti_port *tport = usb_get_serial_port_data(port);
 787         int status;
 788
 789         dbg("%s - port %d", __func__, port->number);
 790
 791         if (tport == NULL)
 792                 return;
 793
 794         if (I_IXOFF(tty) || C_CRTSCTS(tty)) {
 795                 status = ti_restart_read(tport, tty);
 796                 if (status)
 797                         dev_err(&port->dev, "%s - cannot restart read, %d\n",
 798                                                         __func__, status);
 799         }
 800 }
 801
 802
 803 static int ti_ioctl(struct tty_struct *tty, struct file *file,
 804         unsigned int cmd, unsigned long arg)
 805 {
 806         struct usb_serial_port *port = tty->driver_data;
 807         struct ti_port *tport = usb_get_serial_port_data(port);
 808         struct async_icount cnow;
 809         struct async_icount cprev;
 810
 811         dbg("%s - port %d, cmd = 0x%04X", __func__, port->number, cmd);
 812
 813         if (tport == NULL)
 814                 return -ENODEV;
 815
 816         switch (cmd) {
 817         case TIOCGSERIAL:
 818                 dbg("%s - (%d) TIOCGSERIAL", __func__, port->number);
 819                 return ti_get_serial_info(tport,
 820                                 (struct serial_struct __user *)arg);
 821         case TIOCSSERIAL:
 822                 dbg("%s - (%d) TIOCSSERIAL", __func__, port->number);
 823                 return ti_set_serial_info(tty, tport,
 824                                 (struct serial_struct __user *)arg);
 825         case TIOCMIWAIT:
 826                 dbg("%s - (%d) TIOCMIWAIT", __func__, port->number);
 827                 cprev = tport->tp_icount;
 828                 while (1) {
 829                         interruptible_sleep_on(&tport->tp_msr_wait);
 830                         if (signal_pending(current))
 831                                 return -ERESTARTSYS;
 832                         cnow = tport->tp_icount;
 833                         if (cnow.rng == cprev.rng && cnow.dsr == cprev.dsr &&
 834                             cnow.dcd == cprev.dcd && cnow.cts == cprev.cts)
 835                                 return -EIO; /* no change => error */
 836                         if (((arg & TIOCM_RNG) && (cnow.rng != cprev.rng)) ||
 837                             ((arg & TIOCM_DSR) && (cnow.dsr != cprev.dsr)) ||
 838                             ((arg & TIOCM_CD)  && (cnow.dcd != cprev.dcd)) ||
 839                             ((arg & TIOCM_CTS) && (cnow.cts != cprev.cts)))
 840                                 return 0;
 841                         cprev = cnow;
 842                 }
 843                 break;
 844         case TIOCGICOUNT:
 845                 dbg("%s - (%d) TIOCGICOUNT RX=%d, TX=%d",
 846                                 __func__, port->number,
 847                                 tport->tp_icount.rx, tport->tp_icount.tx);
 848                 if (copy_to_user((void __user *)arg, &tport->tp_icount,
 849                                         sizeof(tport->tp_icount)))
 850                         return -EFAULT;
 851                 return 0;
 852         }
 853         return -ENOIOCTLCMD;
 854 }
 855
 856
 857 static void ti_set_termios(struct tty_struct *tty,
 858                 struct usb_serial_port *port, struct ktermios *old_termios)
 859 {
 860         struct ti_port *tport = usb_get_serial_port_data(port);
 861         struct ti_uart_config *config;
 862         tcflag_t cflag, iflag;
 863         int baud;
 864         int status;
 865         int port_number = port->number - port->serial->minor;
 866         unsigned int mcr;
 867
 868         dbg("%s - port %d", __func__, port->number);
 869
 870         cflag = tty->termios->c_cflag;
 871         iflag = tty->termios->c_iflag;
 872
 873         dbg("%s - cflag %08x, iflag %08x", __func__, cflag, iflag);
 874         dbg("%s - old clfag %08x, old iflag %08x", __func__,
 875                                 old_termios->c_cflag, old_termios->c_iflag);
 876
 877         if (tport == NULL)
 878                 return;
 879
 880         config = kmalloc(sizeof(*config), GFP_KERNEL);
 881         if (!config) {
 882                 dev_err(&port->dev, "%s - out of memory\n", __func__);
 883                 return;
 884         }
 885
 886         config->wFlags = 0;
 887
 888         /* these flags must be set */
 889         config->wFlags |= TI_UART_ENABLE_MS_INTS;
 890         config->wFlags |= TI_UART_ENABLE_AUTO_START_DMA;
 891         config->bUartMode = (__u8)(tport->tp_uart_mode);
 892
 893         switch (cflag & CSIZE) {
 894         case CS5:
 895                     config->bDataBits = TI_UART_5_DATA_BITS;
 896                     break;
 897         case CS6:
 898                     config->bDataBits = TI_UART_6_DATA_BITS;
 899                     break;
 900         case CS7:
 901                     config->bDataBits = TI_UART_7_DATA_BITS;
 902                     break;
 903         default:
 904         case CS8:
 905                     config->bDataBits = TI_UART_8_DATA_BITS;
 906                     break;
 907         }
 908
 909         /* CMSPAR isn't supported by this driver */
 910         tty->termios->c_cflag &= ~CMSPAR;
 911
 912         if (cflag & PARENB) {
 913                 if (cflag & PARODD) {
 914                         config->wFlags |= TI_UART_ENABLE_PARITY_CHECKING;
 915                         config->bParity = TI_UART_ODD_PARITY;
 916                 } else {
 917                         config->wFlags |= TI_UART_ENABLE_PARITY_CHECKING;
 918                         config->bParity = TI_UART_EVEN_PARITY;
 919                 }
 920         } else {
 921                 config->wFlags &= ~TI_UART_ENABLE_PARITY_CHECKING;
 922                 config->bParity = TI_UART_NO_PARITY;
 923         }
 924
 925         if (cflag & CSTOPB)
 926                 config->bStopBits = TI_UART_2_STOP_BITS;
 927         else
 928                 config->bStopBits = TI_UART_1_STOP_BITS;
 929
 930         if (cflag & CRTSCTS) {
 931                 /* RTS flow control must be off to drop RTS for baud rate B0 */
 932                 if ((cflag & CBAUD) != B0)
 933                         config->wFlags |= TI_UART_ENABLE_RTS_IN;
 934                 config->wFlags |= TI_UART_ENABLE_CTS_OUT;
 935         } else {
 936                 tty->hw_stopped = 0;
 937                 ti_restart_read(tport, tty);
 938         }
 939
 940         if (I_IXOFF(tty) || I_IXON(tty)) {
 941                 config->cXon  = START_CHAR(tty);
 942                 config->cXoff = STOP_CHAR(tty);
 943
 944                 if (I_IXOFF(tty))
 945                         config->wFlags |= TI_UART_ENABLE_X_IN;
 946                 else
 947                         ti_restart_read(tport, tty);
 948
 949                 if (I_IXON(tty))
 950                         config->wFlags |= TI_UART_ENABLE_X_OUT;
 951         }
 952
 953         baud = tty_get_baud_rate(tty);
 954         if (!baud)
 955                 baud = 9600;
 956         if (tport->tp_tdev->td_is_3410)
 957                 config->wBaudRate = (__u16)((923077 + baud/2) / baud);
 958         else
 959                 config->wBaudRate = (__u16)((461538 + baud/2) / baud);
 960
 961         /* FIXME: Should calculate resulting baud here and report it back */
 962         if ((cflag & CBAUD) != B0)
 963                 tty_encode_baud_rate(tty, baud, baud);
 964
 965         dbg("%s - BaudRate=%d, wBaudRate=%d, wFlags=0x%04X, bDataBits=%d, bParity=%d, bStopBits=%d, cXon=%d, cXoff=%d, bUartMode=%d",
 966         __func__, baud, config->wBaudRate, config->wFlags, config->bDataBits, config->bParity, config->bStopBits, config->cXon, config->cXoff, config->bUartMode);
 967
 968         cpu_to_be16s(&config->wBaudRate);
 969         cpu_to_be16s(&config->wFlags);
 970
 971         status = ti_command_out_sync(tport->tp_tdev, TI_SET_CONFIG,
 972                 (__u8)(TI_UART1_PORT + port_number), 0, (__u8 *)config,
 973                 sizeof(*config));
 974         if (status)
 975                 dev_err(&port->dev, "%s - cannot set config on port %d, %d\n",
 976                                         __func__, port_number, status);
 977
 978         /* SET_CONFIG asserts RTS and DTR, reset them correctly */
 979         mcr = tport->tp_shadow_mcr;
 980         /* if baud rate is B0, clear RTS and DTR */
 981         if ((cflag & CBAUD) == B0)
 982                 mcr &= ~(TI_MCR_DTR | TI_MCR_RTS);
 983         status = ti_set_mcr(tport, mcr);
 984         if (status)
 985                 dev_err(&port->dev,
 986                         "%s - cannot set modem control on port %d, %d\n",
 987                                                 __func__, port_number, status);
 988
 989         kfree(config);
 990 }
 991
 992
 993 static int ti_tiocmget(struct tty_struct *tty, struct file *file)
 994 {
 995         struct usb_serial_port *port = tty->driver_data;
 996         struct ti_port *tport = usb_get_serial_port_data(port);
 997         unsigned int result;
 998         unsigned int msr;
 999         unsigned int mcr;
1000         unsigned long flags;
1001
1002         dbg("%s - port %d", __func__, port->number);
1003
1004         if (tport == NULL)
1005                 return -ENODEV;
1006
1007         spin_lock_irqsave(&tport->tp_lock, flags);
1008         msr = tport->tp_msr;
1009         mcr = tport->tp_shadow_mcr;
1010         spin_unlock_irqrestore(&tport->tp_lock, flags);
1011
1012         result = ((mcr & TI_MCR_DTR) ? TIOCM_DTR : 0)
1013                 | ((mcr & TI_MCR_RTS) ? TIOCM_RTS : 0)
1014                 | ((mcr & TI_MCR_LOOP) ? TIOCM_LOOP : 0)
1015                 | ((msr & TI_MSR_CTS) ? TIOCM_CTS : 0)
1016                 | ((msr & TI_MSR_CD) ? TIOCM_CAR : 0)
1017                 | ((msr & TI_MSR_RI) ? TIOCM_RI : 0)
1018                 | ((msr & TI_MSR_DSR) ? TIOCM_DSR : 0);
1019
1020         dbg("%s - 0x%04X", __func__, result);
1021
1022         return result;
1023 }
1024
1025
1026 static int ti_tiocmset(struct tty_struct *tty, struct file *file,
1027         unsigned int set, unsigned int clear)
1028 {
1029         struct usb_serial_port *port = tty->driver_data;
1030         struct ti_port *tport = usb_get_serial_port_data(port);
1031         unsigned int mcr;
1032         unsigned long flags;
1033
1034         dbg("%s - port %d", __func__, port->number);
1035
1036         if (tport == NULL)
1037                 return -ENODEV;
1038
1039         spin_lock_irqsave(&tport->tp_lock, flags);
1040         mcr = tport->tp_shadow_mcr;
1041
1042         if (set & TIOCM_RTS)
1043                 mcr |= TI_MCR_RTS;
1044         if (set & TIOCM_DTR)
1045                 mcr |= TI_MCR_DTR;
1046         if (set & TIOCM_LOOP)
1047                 mcr |= TI_MCR_LOOP;
1048
1049         if (clear & TIOCM_RTS)
1050                 mcr &= ~TI_MCR_RTS;
1051         if (clear & TIOCM_DTR)
1052                 mcr &= ~TI_MCR_DTR;
1053         if (clear & TIOCM_LOOP)
1054                 mcr &= ~TI_MCR_LOOP;
1055         spin_unlock_irqrestore(&tport->tp_lock, flags);
1056
1057         return ti_set_mcr(tport, mcr);
1058 }
1059
1060
1061 static void ti_break(struct tty_struct *tty, int break_state)
1062 {
1063         struct usb_serial_port *port = tty->driver_data;
1064         struct ti_port *tport = usb_get_serial_port_data(port);
1065         int status;
1066
1067         dbg("%s - state = %d", __func__, break_state);
1068
1069         if (tport == NULL)
1070                 return;
1071
1072         ti_drain(tport, (tport->tp_closing_wait*HZ)/100, 0);
1073
1074         status = ti_write_byte(tport->tp_tdev,
1075                 tport->tp_uart_base_addr + TI_UART_OFFSET_LCR,
1076                 TI_LCR_BREAK, break_state == -1 ? TI_LCR_BREAK : 0);
1077
1078         if (status)
1079                 dbg("%s - error setting break, %d", __func__, status);
1080 }
1081
1082
1083 static void ti_interrupt_callback(struct urb *urb)
1084 {
1085         struct ti_device *tdev = urb->context;
1086         struct usb_serial_port *port;
1087         struct usb_serial *serial = tdev->td_serial;
1088         struct ti_port *tport;
1089         struct device *dev = &urb->dev->dev;
1090         unsigned char *data = urb->transfer_buffer;
1091         int length = urb->actual_length;
1092         int port_number;
1093         int function;
1094         int status = urb->status;
1095         int retval;
1096         __u8 msr;
1097
1098         dbg("%s", __func__);
1099
1100         switch (status) {
1101         case 0:
1102                 break;
1103         case -ECONNRESET:
1104         case -ENOENT:
1105         case -ESHUTDOWN:
1106                 dbg("%s - urb shutting down, %d", __func__, status);
1107                 tdev->td_urb_error = 1;
1108                 return;
1109         default:
1110                 dev_err(dev, "%s - nonzero urb status, %d\n",
1111                         __func__, status);
1112                 tdev->td_urb_error = 1;
1113                 goto exit;
1114         }
1115
1116         if (length != 2) {
1117                 dbg("%s - bad packet size, %d", __func__, length);
1118                 goto exit;
1119         }
1120
1121         if (data[0] == TI_CODE_HARDWARE_ERROR) {
1122                 dev_err(dev, "%s - hardware error, %d\n", __func__, data[1]);
1123                 goto exit;
1124         }
1125
1126         port_number = TI_GET_PORT_FROM_CODE(data[0]);
1127         function = TI_GET_FUNC_FROM_CODE(data[0]);
1128
1129         dbg("%s - port_number %d, function %d, data 0x%02X",
1130                                 __func__, port_number, function, data[1]);
1131
1132         if (port_number >= serial->num_ports) {
1133                 dev_err(dev, "%s - bad port number, %d\n",
1134                                                 __func__, port_number);
1135                 goto exit;
1136         }
1137
1138         port = serial->port[port_number];
1139
1140         tport = usb_get_serial_port_data(port);
1141         if (!tport)
1142                 goto exit;
1143
1144         switch (function) {
1145         case TI_CODE_DATA_ERROR:
1146                 dev_err(dev, "%s - DATA ERROR, port %d, data 0x%02X\n",
1147                                         __func__, port_number, data[1]);
1148                 break;
1149
1150         case TI_CODE_MODEM_STATUS:
1151                 msr = data[1];
1152                 dbg("%s - port %d, msr 0x%02X", __func__, port_number, msr);
1153                 ti_handle_new_msr(tport, msr);
1154                 break;
1155
1156         default:
1157                 dev_err(dev, "%s - unknown interrupt code, 0x%02X\n",
1158                                                         __func__, data[1]);
1159                 break;
1160         }
1161
1162 exit:
1163         retval = usb_submit_urb(urb, GFP_ATOMIC);
1164         if (retval)
1165                 dev_err(dev, "%s - resubmit interrupt urb failed, %d\n",
1166                         __func__, retval);
1167 }
1168
1169
1170 static void ti_bulk_in_callback(struct urb *urb)
1171 {
1172         struct ti_port *tport = urb->context;
1173         struct usb_serial_port *port = tport->tp_port;
1174         struct device *dev = &urb->dev->dev;
1175         int status = urb->status;
1176         int retval = 0;
1177         struct tty_struct *tty;
1178
1179         dbg("%s", __func__);
1180
1181         switch (status) {
1182         case 0:
1183                 break;
1184         case -ECONNRESET:
1185         case -ENOENT:
1186         case -ESHUTDOWN:
1187                 dbg("%s - urb shutting down, %d", __func__, status);
1188                 tport->tp_tdev->td_urb_error = 1;
1189                 wake_up_interruptible(&tport->tp_write_wait);
1190                 return;
1191         default:
1192                 dev_err(dev, "%s - nonzero urb status, %d\n",
1193                         __func__, status);
1194                 tport->tp_tdev->td_urb_error = 1;
1195                 wake_up_interruptible(&tport->tp_write_wait);
1196         }
1197
1198         if (status == -EPIPE)
1199                 goto exit;
1200
1201         if (status) {
1202                 dev_err(dev, "%s - stopping read!\n", __func__);
1203                 return;
1204         }
1205
1206         tty = tty_port_tty_get(&port->port);
1207         if (tty) {
1208                 if (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",
1214                                         __func__);
1215                         else
1216                                 ti_recv(&urb->dev->dev, tty,
1217                                                 urb->transfer_buffer,
1218                                                 urb->actual_length);
1219                         spin_lock(&tport->tp_lock);
1220                         tport->tp_icount.rx += urb->actual_length;
1221                         spin_unlock(&tport->tp_lock);
1222                 }
1223                 tty_kref_put(tty);
1224         }
1225
1226 exit:
1227         /* continue to read unless stopping */
1228         spin_lock(&tport->tp_lock);
1229         if (tport->tp_read_urb_state == TI_READ_URB_RUNNING) {
1230                 urb->dev = port->serial->dev;
1231                 retval = usb_submit_urb(urb, GFP_ATOMIC);
1232         } else if (tport->tp_read_urb_state == TI_READ_URB_STOPPING) {
1233                 tport->tp_read_urb_state = TI_READ_URB_STOPPED;
1234         }
1235         spin_unlock(&tport->tp_lock);
1236         if (retval)
1237                 dev_err(dev, "%s - resubmit read urb failed, %d\n",
1238                         __func__, retval);
1239 }
1240
1241
1242 static void ti_bulk_out_callback(struct urb *urb)
1243 {
1244         struct ti_port *tport = urb->context;
1245         struct usb_serial_port *port = tport->tp_port;
1246         struct device *dev = &urb->dev->dev;
1247         int status = urb->status;
1248
1249         dbg("%s - port %d", __func__, port->number);
1250
1251         tport->tp_write_urb_in_use = 0;
1252
1253         switch (status) {
1254         case 0:
1255                 break;
1256         case -ECONNRESET:
1257         case -ENOENT:
1258         case -ESHUTDOWN:
1259                 dbg("%s - urb shutting down, %d", __func__, status);
1260                 tport->tp_tdev->td_urb_error = 1;
1261                 wake_up_interruptible(&tport->tp_write_wait);
1262                 return;
1263         default:
1264                 dev_err(dev, "%s - nonzero urb status, %d\n",
1265                         __func__, status);
1266                 tport->tp_tdev->td_urb_error = 1;
1267                 wake_up_interruptible(&tport->tp_write_wait);
1268         }
1269
1270         /* send any buffered data */
1271         ti_send(tport);
1272 }
1273
1274
1275 static void ti_recv(struct device *dev, struct tty_struct *tty,
1276         unsigned char *data, int length)
1277 {
1278         int cnt;
1279
1280         do {
1281                 cnt = tty_buffer_request_room(tty, length);
1282                 if (cnt < length) {
1283                         dev_err(dev, "%s - dropping data, %d bytes lost\n",
1284                                                 __func__, length - cnt);
1285                         if (cnt == 0)
1286                                 break;
1287                 }
1288                 tty_insert_flip_string(tty, data, cnt);
1289                 tty_flip_buffer_push(tty);
1290                 data += cnt;
1291                 length -= cnt;
1292         } while (length > 0);
1293
1294 }
1295
1296
1297 static void ti_send(struct ti_port *tport)
1298 {
1299         int count, result;
1300         struct usb_serial_port *port = tport->tp_port;
1301         struct tty_struct *tty = tty_port_tty_get(&port->port); /* FIXME */
1302         unsigned long flags;
1303
1304
1305         dbg("%s - port %d", __func__, port->number);
1306
1307         spin_lock_irqsave(&tport->tp_lock, flags);
1308
1309         if (tport->tp_write_urb_in_use)
1310                 goto unlock;
1311
1312         count = ti_buf_get(tport->tp_write_buf,
1313                                 port->write_urb->transfer_buffer,
1314                                 port->bulk_out_size);
1315
1316         if (count == 0)
1317                 goto unlock;
1318
1319         tport->tp_write_urb_in_use = 1;
1320
1321         spin_unlock_irqrestore(&tport->tp_lock, flags);
1322
1323         usb_serial_debug_data(debug, &port->dev, __func__, count,
1324                                         port->write_urb->transfer_buffer);
1325
1326         usb_fill_bulk_urb(port->write_urb, port->serial->dev,
1327                            usb_sndbulkpipe(port->serial->dev,
1328                                             port->bulk_out_endpointAddress),
1329                            port->write_urb->transfer_buffer, count,
1330                            ti_bulk_out_callback, tport);
1331
1332         result = usb_submit_urb(port->write_urb, GFP_ATOMIC);
1333         if (result) {
1334                 dev_err(&port->dev, "%s - submit write urb failed, %d\n",
1335                                                         __func__, result);
1336                 tport->tp_write_urb_in_use = 0;
1337                 /* TODO: reschedule ti_send */
1338         } else {
1339                 spin_lock_irqsave(&tport->tp_lock, flags);
1340                 tport->tp_icount.tx += count;
1341                 spin_unlock_irqrestore(&tport->tp_lock, flags);
1342         }
1343
1344         /* more room in the buffer for new writes, wakeup */
1345         if (tty)
1346                 tty_wakeup(tty);
1347         tty_kref_put(tty);
1348         wake_up_interruptible(&tport->tp_write_wait);
1349         return;
1350 unlock:
1351         spin_unlock_irqrestore(&tport->tp_lock, flags);
1352         tty_kref_put(tty);
1353         return;
1354 }
1355
1356
1357 static int ti_set_mcr(struct ti_port *tport, unsigned int mcr)
1358 {
1359         unsigned long flags;
1360         int status;
1361
1362         status = ti_write_byte(tport->tp_tdev,
1363                 tport->tp_uart_base_addr + TI_UART_OFFSET_MCR,
1364                 TI_MCR_RTS | TI_MCR_DTR | TI_MCR_LOOP, mcr);
1365
1366         spin_lock_irqsave(&tport->tp_lock, flags);
1367         if (!status)
1368                 tport->tp_shadow_mcr = mcr;
1369         spin_unlock_irqrestore(&tport->tp_lock, flags);
1370
1371         return status;
1372 }
1373
1374
1375 static int ti_get_lsr(struct ti_port *tport)
1376 {
1377         int size, status;
1378         struct ti_device *tdev = tport->tp_tdev;
1379         struct usb_serial_port *port = tport->tp_port;
1380         int port_number = port->number - port->serial->minor;
1381         struct ti_port_status *data;
1382
1383         dbg("%s - port %d", __func__, port->number);
1384
1385         size = sizeof(struct ti_port_status);
1386         data = kmalloc(size, GFP_KERNEL);
1387         if (!data) {
1388                 dev_err(&port->dev, "%s - out of memory\n", __func__);
1389                 return -ENOMEM;
1390         }
1391
1392         status = ti_command_in_sync(tdev, TI_GET_PORT_STATUS,
1393                 (__u8)(TI_UART1_PORT+port_number), 0, (__u8 *)data, size);
1394         if (status) {
1395                 dev_err(&port->dev,
1396                         "%s - get port status command failed, %d\n",
1397                                                         __func__, status);
1398                 goto free_data;
1399         }
1400
1401         dbg("%s - lsr 0x%02X", __func__, data->bLSR);
1402
1403         tport->tp_lsr = data->bLSR;
1404
1405 free_data:
1406         kfree(data);
1407         return status;
1408 }
1409
1410
1411 static int ti_get_serial_info(struct ti_port *tport,
1412         struct serial_struct __user *ret_arg)
1413 {
1414         struct usb_serial_port *port = tport->tp_port;
1415         struct serial_struct ret_serial;
1416
1417         if (!ret_arg)
1418                 return -EFAULT;
1419
1420         memset(&ret_serial, 0, sizeof(ret_serial));
1421
1422         ret_serial.type = PORT_16550A;
1423         ret_serial.line = port->serial->minor;
1424         ret_serial.port = port->number - port->serial->minor;
1425         ret_serial.flags = tport->tp_flags;
1426         ret_serial.xmit_fifo_size = TI_WRITE_BUF_SIZE;
1427         ret_serial.baud_base = tport->tp_tdev->td_is_3410 ? 921600 : 460800;
1428         ret_serial.closing_wait = tport->tp_closing_wait;
1429
1430         if (copy_to_user(ret_arg, &ret_serial, sizeof(*ret_arg)))
1431                 return -EFAULT;
1432
1433         return 0;
1434 }
1435
1436
1437 static int ti_set_serial_info(struct tty_struct *tty, struct ti_port *tport,
1438         struct serial_struct __user *new_arg)
1439 {
1440         struct serial_struct new_serial;
1441
1442         if (copy_from_user(&new_serial, new_arg, sizeof(new_serial)))
1443                 return -EFAULT;
1444
1445         tport->tp_flags = new_serial.flags & TI_SET_SERIAL_FLAGS;
1446         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 }