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_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[10+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         { USB_DEVICE(IBM_VENDOR_ID, IBM_4543_PRODUCT_ID) },
 188         { USB_DEVICE(IBM_VENDOR_ID, IBM_454B_PRODUCT_ID) },
 189         { USB_DEVICE(IBM_VENDOR_ID, IBM_454C_PRODUCT_ID) },
 190 };
 191
 192 static struct usb_device_id ti_id_table_5052[5+TI_EXTRA_VID_PID_COUNT+1] = {
 193         { USB_DEVICE(TI_VENDOR_ID, TI_5052_BOOT_PRODUCT_ID) },
 194         { USB_DEVICE(TI_VENDOR_ID, TI_5152_BOOT_PRODUCT_ID) },
 195         { USB_DEVICE(TI_VENDOR_ID, TI_5052_EEPROM_PRODUCT_ID) },
 196         { USB_DEVICE(TI_VENDOR_ID, TI_5052_FIRMWARE_PRODUCT_ID) },
 197         { USB_DEVICE(IBM_VENDOR_ID, IBM_4543_PRODUCT_ID) },
 198 };
 199
 200 static struct usb_device_id ti_id_table_combined[14+2*TI_EXTRA_VID_PID_COUNT+1] = {
 201         { USB_DEVICE(TI_VENDOR_ID, TI_3410_PRODUCT_ID) },
 202         { USB_DEVICE(TI_VENDOR_ID, TI_3410_EZ430_ID) },
 203         { USB_DEVICE(MTS_VENDOR_ID, MTS_GSM_NO_FW_PRODUCT_ID) },
 204         { USB_DEVICE(MTS_VENDOR_ID, MTS_CDMA_NO_FW_PRODUCT_ID) },
 205         { USB_DEVICE(MTS_VENDOR_ID, MTS_CDMA_PRODUCT_ID) },
 206         { USB_DEVICE(MTS_VENDOR_ID, MTS_GSM_PRODUCT_ID) },
 207         { USB_DEVICE(MTS_VENDOR_ID, MTS_EDGE_PRODUCT_ID) },
 208         { USB_DEVICE(TI_VENDOR_ID, TI_5052_BOOT_PRODUCT_ID) },
 209         { USB_DEVICE(TI_VENDOR_ID, TI_5152_BOOT_PRODUCT_ID) },
 210         { USB_DEVICE(TI_VENDOR_ID, TI_5052_EEPROM_PRODUCT_ID) },
 211         { USB_DEVICE(TI_VENDOR_ID, TI_5052_FIRMWARE_PRODUCT_ID) },
 212         { USB_DEVICE(IBM_VENDOR_ID, IBM_4543_PRODUCT_ID) },
 213         { USB_DEVICE(IBM_VENDOR_ID, IBM_454B_PRODUCT_ID) },
 214         { USB_DEVICE(IBM_VENDOR_ID, IBM_454C_PRODUCT_ID) },
 215         { }
 216 };
 217
 218 static struct usb_driver ti_usb_driver = {
 219         .name                   = "ti_usb_3410_5052",
 220         .probe                  = usb_serial_probe,
 221         .disconnect             = usb_serial_disconnect,
 222         .id_table               = ti_id_table_combined,
 223         .no_dynamic_id =        1,
 224 };
 225
 226 static struct usb_serial_driver ti_1port_device = {
 227         .driver = {
 228                 .owner          = THIS_MODULE,
 229                 .name           = "ti_usb_3410_5052_1",
 230         },
 231         .description            = "TI USB 3410 1 port adapter",
 232         .usb_driver             = &ti_usb_driver,
 233         .id_table               = ti_id_table_3410,
 234         .num_ports              = 1,
 235         .attach                 = ti_startup,
 236         .shutdown               = ti_shutdown,
 237         .open                   = ti_open,
 238         .close                  = ti_close,
 239         .write                  = ti_write,
 240         .write_room             = ti_write_room,
 241         .chars_in_buffer        = ti_chars_in_buffer,
 242         .throttle               = ti_throttle,
 243         .unthrottle             = ti_unthrottle,
 244         .ioctl                  = ti_ioctl,
 245         .set_termios            = ti_set_termios,
 246         .tiocmget               = ti_tiocmget,
 247         .tiocmset               = ti_tiocmset,
 248         .break_ctl              = ti_break,
 249         .read_int_callback      = ti_interrupt_callback,
 250         .read_bulk_callback     = ti_bulk_in_callback,
 251         .write_bulk_callback    = ti_bulk_out_callback,
 252 };
 253
 254 static struct usb_serial_driver ti_2port_device = {
 255         .driver = {
 256                 .owner          = THIS_MODULE,
 257                 .name           = "ti_usb_3410_5052_2",
 258         },
 259         .description            = "TI USB 5052 2 port adapter",
 260         .usb_driver             = &ti_usb_driver,
 261         .id_table               = ti_id_table_5052,
 262         .num_ports              = 2,
 263         .attach                 = ti_startup,
 264         .shutdown               = ti_shutdown,
 265         .open                   = ti_open,
 266         .close                  = ti_close,
 267         .write                  = ti_write,
 268         .write_room             = ti_write_room,
 269         .chars_in_buffer        = ti_chars_in_buffer,
 270         .throttle               = ti_throttle,
 271         .unthrottle             = ti_unthrottle,
 272         .ioctl                  = ti_ioctl,
 273         .set_termios            = ti_set_termios,
 274         .tiocmget               = ti_tiocmget,
 275         .tiocmset               = ti_tiocmset,
 276         .break_ctl              = ti_break,
 277         .read_int_callback      = ti_interrupt_callback,
 278         .read_bulk_callback     = ti_bulk_in_callback,
 279         .write_bulk_callback    = ti_bulk_out_callback,
 280 };
 281
 282
 283 /* Module */
 284
 285 MODULE_AUTHOR(TI_DRIVER_AUTHOR);
 286 MODULE_DESCRIPTION(TI_DRIVER_DESC);
 287 MODULE_VERSION(TI_DRIVER_VERSION);
 288 MODULE_LICENSE("GPL");
 289
 290 MODULE_FIRMWARE("ti_3410.fw");
 291 MODULE_FIRMWARE("ti_5052.fw");
 292 MODULE_FIRMWARE("mts_cdma.fw");
 293 MODULE_FIRMWARE("mts_gsm.fw");
 294 MODULE_FIRMWARE("mts_edge.fw");
 295
 296 module_param(debug, bool, S_IRUGO | S_IWUSR);
 297 MODULE_PARM_DESC(debug, "Enable debugging, 0=no, 1=yes");
 298
 299 module_param(low_latency, bool, S_IRUGO | S_IWUSR);
 300 MODULE_PARM_DESC(low_latency,
 301                 "TTY low_latency flag, 0=off, 1=on, default is off");
 302
 303 module_param(closing_wait, int, S_IRUGO | S_IWUSR);
 304 MODULE_PARM_DESC(closing_wait,
 305     "Maximum wait for data to drain in close, in .01 secs, default is 4000");
 306
 307 module_param_array(vendor_3410, ushort, &vendor_3410_count, S_IRUGO);
 308 MODULE_PARM_DESC(vendor_3410,
 309                 "Vendor ids for 3410 based devices, 1-5 short integers");
 310 module_param_array(product_3410, ushort, &product_3410_count, S_IRUGO);
 311 MODULE_PARM_DESC(product_3410,
 312                 "Product ids for 3410 based devices, 1-5 short integers");
 313 module_param_array(vendor_5052, ushort, &vendor_5052_count, S_IRUGO);
 314 MODULE_PARM_DESC(vendor_5052,
 315                 "Vendor ids for 5052 based devices, 1-5 short integers");
 316 module_param_array(product_5052, ushort, &product_5052_count, S_IRUGO);
 317 MODULE_PARM_DESC(product_5052,
 318                 "Product ids for 5052 based devices, 1-5 short integers");
 319
 320 MODULE_DEVICE_TABLE(usb, ti_id_table_combined);
 321
 322
 323 /* Functions */
 324
 325 static int __init ti_init(void)
 326 {
 327         int i, j, c;
 328         int ret;
 329
 330         /* insert extra vendor and product ids */
 331         c = ARRAY_SIZE(ti_id_table_combined) - 2 * TI_EXTRA_VID_PID_COUNT - 1;
 332         j = ARRAY_SIZE(ti_id_table_3410) - TI_EXTRA_VID_PID_COUNT - 1;
 333         for (i = 0; i < min(vendor_3410_count, product_3410_count); i++, j++, c++) {
 334                 ti_id_table_3410[j].idVendor = vendor_3410[i];
 335                 ti_id_table_3410[j].idProduct = product_3410[i];
 336                 ti_id_table_3410[j].match_flags = USB_DEVICE_ID_MATCH_DEVICE;
 337                 ti_id_table_combined[c].idVendor = vendor_3410[i];
 338                 ti_id_table_combined[c].idProduct = product_3410[i];
 339                 ti_id_table_combined[c].match_flags = USB_DEVICE_ID_MATCH_DEVICE;
 340         }
 341         j = ARRAY_SIZE(ti_id_table_5052) - TI_EXTRA_VID_PID_COUNT - 1;
 342         for (i = 0; i < min(vendor_5052_count, product_5052_count); i++, j++, c++) {
 343                 ti_id_table_5052[j].idVendor = vendor_5052[i];
 344                 ti_id_table_5052[j].idProduct = product_5052[i];
 345                 ti_id_table_5052[j].match_flags = USB_DEVICE_ID_MATCH_DEVICE;
 346                 ti_id_table_combined[c].idVendor = vendor_5052[i];
 347                 ti_id_table_combined[c].idProduct = product_5052[i];
 348                 ti_id_table_combined[c].match_flags = USB_DEVICE_ID_MATCH_DEVICE;
 349         }
 350
 351         ret = usb_serial_register(&ti_1port_device);
 352         if (ret)
 353                 goto failed_1port;
 354         ret = usb_serial_register(&ti_2port_device);
 355         if (ret)
 356                 goto failed_2port;
 357
 358         ret = usb_register(&ti_usb_driver);
 359         if (ret)
 360                 goto failed_usb;
 361
 362         printk(KERN_INFO KBUILD_MODNAME ": " TI_DRIVER_VERSION ":"
 363                TI_DRIVER_DESC "\n");
 364
 365         return 0;
 366
 367 failed_usb:
 368         usb_serial_deregister(&ti_2port_device);
 369 failed_2port:
 370         usb_serial_deregister(&ti_1port_device);
 371 failed_1port:
 372         return ret;
 373 }
 374
 375
 376 static void __exit ti_exit(void)
 377 {
 378         usb_serial_deregister(&ti_1port_device);
 379         usb_serial_deregister(&ti_2port_device);
 380         usb_deregister(&ti_usb_driver);
 381 }
 382
 383
 384 module_init(ti_init);
 385 module_exit(ti_exit);
 386
 387
 388 static int ti_startup(struct usb_serial *serial)
 389 {
 390         struct ti_device *tdev;
 391         struct ti_port *tport;
 392         struct usb_device *dev = serial->dev;
 393         int status;
 394         int i;
 395
 396
 397         dbg("%s - product 0x%4X, num configurations %d, configuration value %d",
 398             __func__, le16_to_cpu(dev->descriptor.idProduct),
 399             dev->descriptor.bNumConfigurations,
 400             dev->actconfig->desc.bConfigurationValue);
 401
 402         /* create device structure */
 403         tdev = kzalloc(sizeof(struct ti_device), GFP_KERNEL);
 404         if (tdev == NULL) {
 405                 dev_err(&dev->dev, "%s - out of memory\n", __func__);
 406                 return -ENOMEM;
 407         }
 408         mutex_init(&tdev->td_open_close_lock);
 409         tdev->td_serial = serial;
 410         usb_set_serial_data(serial, tdev);
 411
 412         /* determine device type */
 413         if (usb_match_id(serial->interface, ti_id_table_3410))
 414                 tdev->td_is_3410 = 1;
 415         dbg("%s - device type is %s", __func__,
 416                                 tdev->td_is_3410 ? "3410" : "5052");
 417
 418         /* if we have only 1 configuration, download firmware */
 419         if (dev->descriptor.bNumConfigurations == 1) {
 420                 if ((status = ti_download_firmware(tdev)) != 0)
 421                         goto free_tdev;
 422
 423                 /* 3410 must be reset, 5052 resets itself */
 424                 if (tdev->td_is_3410) {
 425                         msleep_interruptible(100);
 426                         usb_reset_device(dev);
 427                 }
 428
 429                 status = -ENODEV;
 430                 goto free_tdev;
 431         }
 432
 433         /* the second configuration must be set */
 434         if (dev->actconfig->desc.bConfigurationValue == TI_BOOT_CONFIG) {
 435                 status = usb_driver_set_configuration(dev, TI_ACTIVE_CONFIG);
 436                 status = status ? status : -ENODEV;
 437                 goto free_tdev;
 438         }
 439
 440         /* set up port structures */
 441         for (i = 0; i < serial->num_ports; ++i) {
 442                 tport = kzalloc(sizeof(struct ti_port), GFP_KERNEL);
 443                 if (tport == NULL) {
 444                         dev_err(&dev->dev, "%s - out of memory\n", __func__);
 445                         status = -ENOMEM;
 446                         goto free_tports;
 447                 }
 448                 spin_lock_init(&tport->tp_lock);
 449                 tport->tp_uart_base_addr = (i == 0 ?
 450                                 TI_UART1_BASE_ADDR : TI_UART2_BASE_ADDR);
 451                 tport->tp_flags = low_latency ? ASYNC_LOW_LATENCY : 0;
 452                 tport->tp_closing_wait = closing_wait;
 453                 init_waitqueue_head(&tport->tp_msr_wait);
 454                 init_waitqueue_head(&tport->tp_write_wait);
 455                 tport->tp_write_buf = ti_buf_alloc();
 456                 if (tport->tp_write_buf == NULL) {
 457                         dev_err(&dev->dev, "%s - out of memory\n", __func__);
 458                         kfree(tport);
 459                         status = -ENOMEM;
 460                         goto free_tports;
 461                 }
 462                 tport->tp_port = serial->port[i];
 463                 tport->tp_tdev = tdev;
 464                 usb_set_serial_port_data(serial->port[i], tport);
 465                 tport->tp_uart_mode = 0;        /* default is RS232 */
 466         }
 467
 468         return 0;
 469
 470 free_tports:
 471         for (--i; i >= 0; --i) {
 472                 tport = usb_get_serial_port_data(serial->port[i]);
 473                 ti_buf_free(tport->tp_write_buf);
 474                 kfree(tport);
 475                 usb_set_serial_port_data(serial->port[i], NULL);
 476         }
 477 free_tdev:
 478         kfree(tdev);
 479         usb_set_serial_data(serial, NULL);
 480         return status;
 481 }
 482
 483
 484 static void ti_shutdown(struct usb_serial *serial)
 485 {
 486         int i;
 487         struct ti_device *tdev = usb_get_serial_data(serial);
 488         struct ti_port *tport;
 489
 490         dbg("%s", __func__);
 491
 492         for (i = 0; i < serial->num_ports; ++i) {
 493                 tport = usb_get_serial_port_data(serial->port[i]);
 494                 if (tport) {
 495                         ti_buf_free(tport->tp_write_buf);
 496                         kfree(tport);
 497                         usb_set_serial_port_data(serial->port[i], NULL);
 498                 }
 499         }
 500
 501         kfree(tdev);
 502         usb_set_serial_data(serial, NULL);
 503 }
 504
 505
 506 static int ti_open(struct tty_struct *tty,
 507                         struct usb_serial_port *port, struct file *file)
 508 {
 509         struct ti_port *tport = usb_get_serial_port_data(port);
 510         struct ti_device *tdev;
 511         struct usb_device *dev;
 512         struct urb *urb;
 513         int port_number;
 514         int status;
 515         __u16 open_settings = (__u8)(TI_PIPE_MODE_CONTINOUS |
 516                              TI_PIPE_TIMEOUT_ENABLE |
 517                              (TI_TRANSFER_TIMEOUT << 2));
 518
 519         dbg("%s - port %d", __func__, port->number);
 520
 521         if (tport == NULL)
 522                 return -ENODEV;
 523
 524         dev = port->serial->dev;
 525         tdev = tport->tp_tdev;
 526
 527         /* only one open on any port on a device at a time */
 528         if (mutex_lock_interruptible(&tdev->td_open_close_lock))
 529                 return -ERESTARTSYS;
 530
 531         if (tty)
 532                 tty->low_latency =
 533                                 (tport->tp_flags & ASYNC_LOW_LATENCY) ? 1 : 0;
 534
 535         port_number = port->number - port->serial->minor;
 536
 537         memset(&(tport->tp_icount), 0x00, sizeof(tport->tp_icount));
 538
 539         tport->tp_msr = 0;
 540         tport->tp_shadow_mcr |= (TI_MCR_RTS | TI_MCR_DTR);
 541
 542         /* start interrupt urb the first time a port is opened on this device */
 543         if (tdev->td_open_port_count == 0) {
 544                 dbg("%s - start interrupt in urb", __func__);
 545                 urb = tdev->td_serial->port[0]->interrupt_in_urb;
 546                 if (!urb) {
 547                         dev_err(&port->dev, "%s - no interrupt urb\n",
 548                                                                 __func__);
 549                         status = -EINVAL;
 550                         goto release_lock;
 551                 }
 552                 urb->complete = ti_interrupt_callback;
 553                 urb->context = tdev;
 554                 urb->dev = dev;
 555                 status = usb_submit_urb(urb, GFP_KERNEL);
 556                 if (status) {
 557                         dev_err(&port->dev,
 558                                 "%s - submit interrupt urb failed, %d\n",
 559                                         __func__, status);
 560                         goto release_lock;
 561                 }
 562         }
 563
 564         if (tty)
 565                 ti_set_termios(tty, port, tty->termios);
 566
 567         dbg("%s - sending TI_OPEN_PORT", __func__);
 568         status = ti_command_out_sync(tdev, TI_OPEN_PORT,
 569                 (__u8)(TI_UART1_PORT + port_number), open_settings, NULL, 0);
 570         if (status) {
 571                 dev_err(&port->dev, "%s - cannot send open command, %d\n",
 572                                                         __func__, status);
 573                 goto unlink_int_urb;
 574         }
 575
 576         dbg("%s - sending TI_START_PORT", __func__);
 577         status = ti_command_out_sync(tdev, TI_START_PORT,
 578                 (__u8)(TI_UART1_PORT + port_number), 0, NULL, 0);
 579         if (status) {
 580                 dev_err(&port->dev, "%s - cannot send start command, %d\n",
 581                                                         __func__, status);
 582                 goto unlink_int_urb;
 583         }
 584
 585         dbg("%s - sending TI_PURGE_PORT", __func__);
 586         status = ti_command_out_sync(tdev, TI_PURGE_PORT,
 587                 (__u8)(TI_UART1_PORT + port_number), TI_PURGE_INPUT, NULL, 0);
 588         if (status) {
 589                 dev_err(&port->dev, "%s - cannot clear input buffers, %d\n",
 590                                                         __func__, status);
 591                 goto unlink_int_urb;
 592         }
 593         status = ti_command_out_sync(tdev, TI_PURGE_PORT,
 594                 (__u8)(TI_UART1_PORT + port_number), TI_PURGE_OUTPUT, NULL, 0);
 595         if (status) {
 596                 dev_err(&port->dev, "%s - cannot clear output buffers, %d\n",
 597                                                         __func__, status);
 598                 goto unlink_int_urb;
 599         }
 600
 601         /* reset the data toggle on the bulk endpoints to work around bug in
 602          * host controllers where things get out of sync some times */
 603         usb_clear_halt(dev, port->write_urb->pipe);
 604         usb_clear_halt(dev, port->read_urb->pipe);
 605
 606         if (tty)
 607                 ti_set_termios(tty, port, tty->termios);
 608
 609         dbg("%s - sending TI_OPEN_PORT (2)", __func__);
 610         status = ti_command_out_sync(tdev, TI_OPEN_PORT,
 611                 (__u8)(TI_UART1_PORT + port_number), open_settings, NULL, 0);
 612         if (status) {
 613                 dev_err(&port->dev, "%s - cannot send open command (2), %d\n",
 614                                                         __func__, status);
 615                 goto unlink_int_urb;
 616         }
 617
 618         dbg("%s - sending TI_START_PORT (2)", __func__);
 619         status = ti_command_out_sync(tdev, TI_START_PORT,
 620                 (__u8)(TI_UART1_PORT + port_number), 0, NULL, 0);
 621         if (status) {
 622                 dev_err(&port->dev, "%s - cannot send start command (2), %d\n",
 623                                                         __func__, status);
 624                 goto unlink_int_urb;
 625         }
 626
 627         /* start read urb */
 628         dbg("%s - start read urb", __func__);
 629         urb = port->read_urb;
 630         if (!urb) {
 631                 dev_err(&port->dev, "%s - no read urb\n", __func__);
 632                 status = -EINVAL;
 633                 goto unlink_int_urb;
 634         }
 635         tport->tp_read_urb_state = TI_READ_URB_RUNNING;
 636         urb->complete = ti_bulk_in_callback;
 637         urb->context = tport;
 638         urb->dev = dev;
 639         status = usb_submit_urb(urb, GFP_KERNEL);
 640         if (status) {
 641                 dev_err(&port->dev, "%s - submit read urb failed, %d\n",
 642                                                         __func__, status);
 643                 goto unlink_int_urb;
 644         }
 645
 646         tport->tp_is_open = 1;
 647         ++tdev->td_open_port_count;
 648
 649         goto release_lock;
 650
 651 unlink_int_urb:
 652         if (tdev->td_open_port_count == 0)
 653                 usb_kill_urb(port->serial->port[0]->interrupt_in_urb);
 654 release_lock:
 655         mutex_unlock(&tdev->td_open_close_lock);
 656         dbg("%s - exit %d", __func__, status);
 657         return status;
 658 }
 659
 660
 661 static void ti_close(struct tty_struct *tty, struct usb_serial_port *port,
 662                                                         struct file *file)
 663 {
 664         struct ti_device *tdev;
 665         struct ti_port *tport;
 666         int port_number;
 667         int status;
 668         int do_unlock;
 669
 670         dbg("%s - port %d", __func__, port->number);
 671
 672         tdev = usb_get_serial_data(port->serial);
 673         tport = usb_get_serial_port_data(port);
 674         if (tdev == NULL || tport == NULL)
 675                 return;
 676
 677         tport->tp_is_open = 0;
 678
 679         ti_drain(tport, (tport->tp_closing_wait*HZ)/100, 1);
 680
 681         usb_kill_urb(port->read_urb);
 682         usb_kill_urb(port->write_urb);
 683         tport->tp_write_urb_in_use = 0;
 684
 685         port_number = port->number - port->serial->minor;
 686
 687         dbg("%s - sending TI_CLOSE_PORT", __func__);
 688         status = ti_command_out_sync(tdev, TI_CLOSE_PORT,
 689                      (__u8)(TI_UART1_PORT + port_number), 0, NULL, 0);
 690         if (status)
 691                 dev_err(&port->dev,
 692                         "%s - cannot send close port command, %d\n"
 693                                                         , __func__, status);
 694
 695         /* if mutex_lock is interrupted, continue anyway */
 696         do_unlock = !mutex_lock_interruptible(&tdev->td_open_close_lock);
 697         --tport->tp_tdev->td_open_port_count;
 698         if (tport->tp_tdev->td_open_port_count <= 0) {
 699                 /* last port is closed, shut down interrupt urb */
 700                 usb_kill_urb(port->serial->port[0]->interrupt_in_urb);
 701                 tport->tp_tdev->td_open_port_count = 0;
 702         }
 703         if (do_unlock)
 704                 mutex_unlock(&tdev->td_open_close_lock);
 705
 706         dbg("%s - exit", __func__);
 707 }
 708
 709
 710 static int ti_write(struct tty_struct *tty, struct usb_serial_port *port,
 711                         const unsigned char *data, int count)
 712 {
 713         struct ti_port *tport = usb_get_serial_port_data(port);
 714         unsigned long flags;
 715
 716         dbg("%s - port %d", __func__, port->number);
 717
 718         if (count == 0) {
 719                 dbg("%s - write request of 0 bytes", __func__);
 720                 return 0;
 721         }
 722
 723         if (tport == NULL || !tport->tp_is_open)
 724                 return -ENODEV;
 725
 726         spin_lock_irqsave(&tport->tp_lock, flags);
 727         count = ti_buf_put(tport->tp_write_buf, data, count);
 728         spin_unlock_irqrestore(&tport->tp_lock, flags);
 729
 730         ti_send(tport);
 731
 732         return count;
 733 }
 734
 735
 736 static int ti_write_room(struct tty_struct *tty)
 737 {
 738         struct usb_serial_port *port = tty->driver_data;
 739         struct ti_port *tport = usb_get_serial_port_data(port);
 740         int room = 0;
 741         unsigned long flags;
 742
 743         dbg("%s - port %d", __func__, port->number);
 744
 745         if (tport == NULL)
 746                 return -ENODEV;
 747
 748         spin_lock_irqsave(&tport->tp_lock, flags);
 749         room = ti_buf_space_avail(tport->tp_write_buf);
 750         spin_unlock_irqrestore(&tport->tp_lock, flags);
 751
 752         dbg("%s - returns %d", __func__, room);
 753         return room;
 754 }
 755
 756
 757 static int ti_chars_in_buffer(struct tty_struct *tty)
 758 {
 759         struct usb_serial_port *port = tty->driver_data;
 760         struct ti_port *tport = usb_get_serial_port_data(port);
 761         int chars = 0;
 762         unsigned long flags;
 763
 764         dbg("%s - port %d", __func__, port->number);
 765
 766         if (tport == NULL)
 767                 return -ENODEV;
 768
 769         spin_lock_irqsave(&tport->tp_lock, flags);
 770         chars = ti_buf_data_avail(tport->tp_write_buf);
 771         spin_unlock_irqrestore(&tport->tp_lock, flags);
 772
 773         dbg("%s - returns %d", __func__, chars);
 774         return chars;
 775 }
 776
 777
 778 static void ti_throttle(struct tty_struct *tty)
 779 {
 780         struct usb_serial_port *port = tty->driver_data;
 781         struct ti_port *tport = usb_get_serial_port_data(port);
 782
 783         dbg("%s - port %d", __func__, port->number);
 784
 785         if (tport == NULL)
 786                 return;
 787
 788         if (I_IXOFF(tty) || C_CRTSCTS(tty))
 789                 ti_stop_read(tport, tty);
 790
 791 }
 792
 793
 794 static void ti_unthrottle(struct tty_struct *tty)
 795 {
 796         struct usb_serial_port *port = tty->driver_data;
 797         struct ti_port *tport = usb_get_serial_port_data(port);
 798         int status;
 799
 800         dbg("%s - port %d", __func__, port->number);
 801
 802         if (tport == NULL)
 803                 return;
 804
 805         if (I_IXOFF(tty) || C_CRTSCTS(tty)) {
 806                 status = ti_restart_read(tport, tty);
 807                 if (status)
 808                         dev_err(&port->dev, "%s - cannot restart read, %d\n",
 809                                                         __func__, status);
 810         }
 811 }
 812
 813
 814 static int ti_ioctl(struct tty_struct *tty, struct file *file,
 815         unsigned int cmd, unsigned long arg)
 816 {
 817         struct usb_serial_port *port = tty->driver_data;
 818         struct ti_port *tport = usb_get_serial_port_data(port);
 819         struct async_icount cnow;
 820         struct async_icount cprev;
 821
 822         dbg("%s - port %d, cmd = 0x%04X", __func__, port->number, cmd);
 823
 824         if (tport == NULL)
 825                 return -ENODEV;
 826
 827         switch (cmd) {
 828         case TIOCGSERIAL:
 829                 dbg("%s - (%d) TIOCGSERIAL", __func__, port->number);
 830                 return ti_get_serial_info(tport,
 831                                 (struct serial_struct __user *)arg);
 832         case TIOCSSERIAL:
 833                 dbg("%s - (%d) TIOCSSERIAL", __func__, port->number);
 834                 return ti_set_serial_info(tty, tport,
 835                                 (struct serial_struct __user *)arg);
 836         case TIOCMIWAIT:
 837                 dbg("%s - (%d) TIOCMIWAIT", __func__, port->number);
 838                 cprev = tport->tp_icount;
 839                 while (1) {
 840                         interruptible_sleep_on(&tport->tp_msr_wait);
 841                         if (signal_pending(current))
 842                                 return -ERESTARTSYS;
 843                         cnow = tport->tp_icount;
 844                         if (cnow.rng == cprev.rng && cnow.dsr == cprev.dsr &&
 845                             cnow.dcd == cprev.dcd && cnow.cts == cprev.cts)
 846                                 return -EIO; /* no change => error */
 847                         if (((arg & TIOCM_RNG) && (cnow.rng != cprev.rng)) ||
 848                             ((arg & TIOCM_DSR) && (cnow.dsr != cprev.dsr)) ||
 849                             ((arg & TIOCM_CD)  && (cnow.dcd != cprev.dcd)) ||
 850                             ((arg & TIOCM_CTS) && (cnow.cts != cprev.cts)))
 851                                 return 0;
 852                         cprev = cnow;
 853                 }
 854                 break;
 855         case TIOCGICOUNT:
 856                 dbg("%s - (%d) TIOCGICOUNT RX=%d, TX=%d",
 857                                 __func__, port->number,
 858                                 tport->tp_icount.rx, tport->tp_icount.tx);
 859                 if (copy_to_user((void __user *)arg, &tport->tp_icount,
 860                                         sizeof(tport->tp_icount)))
 861                         return -EFAULT;
 862                 return 0;
 863         }
 864         return -ENOIOCTLCMD;
 865 }
 866
 867
 868 static void ti_set_termios(struct tty_struct *tty,
 869                 struct usb_serial_port *port, struct ktermios *old_termios)
 870 {
 871         struct ti_port *tport = usb_get_serial_port_data(port);
 872         struct ti_uart_config *config;
 873         tcflag_t cflag, iflag;
 874         int baud;
 875         int status;
 876         int port_number = port->number - port->serial->minor;
 877         unsigned int mcr;
 878
 879         dbg("%s - port %d", __func__, port->number);
 880
 881         cflag = tty->termios->c_cflag;
 882         iflag = tty->termios->c_iflag;
 883
 884         dbg("%s - cflag %08x, iflag %08x", __func__, cflag, iflag);
 885         dbg("%s - old clfag %08x, old iflag %08x", __func__,
 886                                 old_termios->c_cflag, old_termios->c_iflag);
 887
 888         if (tport == NULL)
 889                 return;
 890
 891         config = kmalloc(sizeof(*config), GFP_KERNEL);
 892         if (!config) {
 893                 dev_err(&port->dev, "%s - out of memory\n", __func__);
 894                 return;
 895         }
 896
 897         config->wFlags = 0;
 898
 899         /* these flags must be set */
 900         config->wFlags |= TI_UART_ENABLE_MS_INTS;
 901         config->wFlags |= TI_UART_ENABLE_AUTO_START_DMA;
 902         config->bUartMode = (__u8)(tport->tp_uart_mode);
 903
 904         switch (cflag & CSIZE) {
 905         case CS5:
 906                     config->bDataBits = TI_UART_5_DATA_BITS;
 907                     break;
 908         case CS6:
 909                     config->bDataBits = TI_UART_6_DATA_BITS;
 910                     break;
 911         case CS7:
 912                     config->bDataBits = TI_UART_7_DATA_BITS;
 913                     break;
 914         default:
 915         case CS8:
 916                     config->bDataBits = TI_UART_8_DATA_BITS;
 917                     break;
 918         }
 919
 920         /* CMSPAR isn't supported by this driver */
 921         tty->termios->c_cflag &= ~CMSPAR;
 922
 923         if (cflag & PARENB) {
 924                 if (cflag & PARODD) {
 925                         config->wFlags |= TI_UART_ENABLE_PARITY_CHECKING;
 926                         config->bParity = TI_UART_ODD_PARITY;
 927                 } else {
 928                         config->wFlags |= TI_UART_ENABLE_PARITY_CHECKING;
 929                         config->bParity = TI_UART_EVEN_PARITY;
 930                 }
 931         } else {
 932                 config->wFlags &= ~TI_UART_ENABLE_PARITY_CHECKING;
 933                 config->bParity = TI_UART_NO_PARITY;
 934         }
 935
 936         if (cflag & CSTOPB)
 937                 config->bStopBits = TI_UART_2_STOP_BITS;
 938         else
 939                 config->bStopBits = TI_UART_1_STOP_BITS;
 940
 941         if (cflag & CRTSCTS) {
 942                 /* RTS flow control must be off to drop RTS for baud rate B0 */
 943                 if ((cflag & CBAUD) != B0)
 944                         config->wFlags |= TI_UART_ENABLE_RTS_IN;
 945                 config->wFlags |= TI_UART_ENABLE_CTS_OUT;
 946         } else {
 947                 tty->hw_stopped = 0;
 948                 ti_restart_read(tport, tty);
 949         }
 950
 951         if (I_IXOFF(tty) || I_IXON(tty)) {
 952                 config->cXon  = START_CHAR(tty);
 953                 config->cXoff = STOP_CHAR(tty);
 954
 955                 if (I_IXOFF(tty))
 956                         config->wFlags |= TI_UART_ENABLE_X_IN;
 957                 else
 958                         ti_restart_read(tport, tty);
 959
 960                 if (I_IXON(tty))
 961                         config->wFlags |= TI_UART_ENABLE_X_OUT;
 962         }
 963
 964         baud = tty_get_baud_rate(tty);
 965         if (!baud)
 966                 baud = 9600;
 967         if (tport->tp_tdev->td_is_3410)
 968                 config->wBaudRate = (__u16)((923077 + baud/2) / baud);
 969         else
 970                 config->wBaudRate = (__u16)((461538 + baud/2) / baud);
 971
 972         /* FIXME: Should calculate resulting baud here and report it back */
 973         if ((cflag & CBAUD) != B0)
 974                 tty_encode_baud_rate(tty, baud, baud);
 975
 976         dbg("%s - BaudRate=%d, wBaudRate=%d, wFlags=0x%04X, bDataBits=%d, bParity=%d, bStopBits=%d, cXon=%d, cXoff=%d, bUartMode=%d",
 977         __func__, baud, config->wBaudRate, config->wFlags, config->bDataBits, config->bParity, config->bStopBits, config->cXon, config->cXoff, config->bUartMode);
 978
 979         cpu_to_be16s(&config->wBaudRate);
 980         cpu_to_be16s(&config->wFlags);
 981
 982         status = ti_command_out_sync(tport->tp_tdev, TI_SET_CONFIG,
 983                 (__u8)(TI_UART1_PORT + port_number), 0, (__u8 *)config,
 984                 sizeof(*config));
 985         if (status)
 986                 dev_err(&port->dev, "%s - cannot set config on port %d, %d\n",
 987                                         __func__, port_number, status);
 988
 989         /* SET_CONFIG asserts RTS and DTR, reset them correctly */
 990         mcr = tport->tp_shadow_mcr;
 991         /* if baud rate is B0, clear RTS and DTR */
 992         if ((cflag & CBAUD) == B0)
 993                 mcr &= ~(TI_MCR_DTR | TI_MCR_RTS);
 994         status = ti_set_mcr(tport, mcr);
 995         if (status)
 996                 dev_err(&port->dev,
 997                         "%s - cannot set modem control on port %d, %d\n",
 998                                                 __func__, port_number, status);
 999
1000         kfree(config);
1001 }
1002
1003
1004 static int ti_tiocmget(struct tty_struct *tty, struct file *file)
1005 {
1006         struct usb_serial_port *port = tty->driver_data;
1007         struct ti_port *tport = usb_get_serial_port_data(port);
1008         unsigned int result;
1009         unsigned int msr;
1010         unsigned int mcr;
1011         unsigned long flags;
1012
1013         dbg("%s - port %d", __func__, port->number);
1014
1015         if (tport == NULL)
1016                 return -ENODEV;
1017
1018         spin_lock_irqsave(&tport->tp_lock, flags);
1019         msr = tport->tp_msr;
1020         mcr = tport->tp_shadow_mcr;
1021         spin_unlock_irqrestore(&tport->tp_lock, flags);
1022
1023         result = ((mcr & TI_MCR_DTR) ? TIOCM_DTR : 0)
1024                 | ((mcr & TI_MCR_RTS) ? TIOCM_RTS : 0)
1025                 | ((mcr & TI_MCR_LOOP) ? TIOCM_LOOP : 0)
1026                 | ((msr & TI_MSR_CTS) ? TIOCM_CTS : 0)
1027                 | ((msr & TI_MSR_CD) ? TIOCM_CAR : 0)
1028                 | ((msr & TI_MSR_RI) ? TIOCM_RI : 0)
1029                 | ((msr & TI_MSR_DSR) ? TIOCM_DSR : 0);
1030
1031         dbg("%s - 0x%04X", __func__, result);
1032
1033         return result;
1034 }
1035
1036
1037 static int ti_tiocmset(struct tty_struct *tty, struct file *file,
1038         unsigned int set, unsigned int clear)
1039 {
1040         struct usb_serial_port *port = tty->driver_data;
1041         struct ti_port *tport = usb_get_serial_port_data(port);
1042         unsigned int mcr;
1043         unsigned long flags;
1044
1045         dbg("%s - port %d", __func__, port->number);
1046
1047         if (tport == NULL)
1048                 return -ENODEV;
1049
1050         spin_lock_irqsave(&tport->tp_lock, flags);
1051         mcr = tport->tp_shadow_mcr;
1052
1053         if (set & TIOCM_RTS)
1054                 mcr |= TI_MCR_RTS;
1055         if (set & TIOCM_DTR)
1056                 mcr |= TI_MCR_DTR;
1057         if (set & TIOCM_LOOP)
1058                 mcr |= TI_MCR_LOOP;
1059
1060         if (clear & TIOCM_RTS)
1061                 mcr &= ~TI_MCR_RTS;
1062         if (clear & TIOCM_DTR)
1063                 mcr &= ~TI_MCR_DTR;
1064         if (clear & TIOCM_LOOP)
1065                 mcr &= ~TI_MCR_LOOP;
1066         spin_unlock_irqrestore(&tport->tp_lock, flags);
1067
1068         return ti_set_mcr(tport, mcr);
1069 }
1070
1071
1072 static void ti_break(struct tty_struct *tty, int break_state)
1073 {
1074         struct usb_serial_port *port = tty->driver_data;
1075         struct ti_port *tport = usb_get_serial_port_data(port);
1076         int status;
1077
1078         dbg("%s - state = %d", __func__, break_state);
1079
1080         if (tport == NULL)
1081                 return;
1082
1083         ti_drain(tport, (tport->tp_closing_wait*HZ)/100, 0);
1084
1085         status = ti_write_byte(tport->tp_tdev,
1086                 tport->tp_uart_base_addr + TI_UART_OFFSET_LCR,
1087                 TI_LCR_BREAK, break_state == -1 ? TI_LCR_BREAK : 0);
1088
1089         if (status)
1090                 dbg("%s - error setting break, %d", __func__, status);
1091 }
1092
1093
1094 static void ti_interrupt_callback(struct urb *urb)
1095 {
1096         struct ti_device *tdev = urb->context;
1097         struct usb_serial_port *port;
1098         struct usb_serial *serial = tdev->td_serial;
1099         struct ti_port *tport;
1100         struct device *dev = &urb->dev->dev;
1101         unsigned char *data = urb->transfer_buffer;
1102         int length = urb->actual_length;
1103         int port_number;
1104         int function;
1105         int status = urb->status;
1106         int retval;
1107         __u8 msr;
1108
1109         dbg("%s", __func__);
1110
1111         switch (status) {
1112         case 0:
1113                 break;
1114         case -ECONNRESET:
1115         case -ENOENT:
1116         case -ESHUTDOWN:
1117                 dbg("%s - urb shutting down, %d", __func__, status);
1118                 tdev->td_urb_error = 1;
1119                 return;
1120         default:
1121                 dev_err(dev, "%s - nonzero urb status, %d\n",
1122                         __func__, status);
1123                 tdev->td_urb_error = 1;
1124                 goto exit;
1125         }
1126
1127         if (length != 2) {
1128                 dbg("%s - bad packet size, %d", __func__, length);
1129                 goto exit;
1130         }
1131
1132         if (data[0] == TI_CODE_HARDWARE_ERROR) {
1133                 dev_err(dev, "%s - hardware error, %d\n", __func__, data[1]);
1134                 goto exit;
1135         }
1136
1137         port_number = TI_GET_PORT_FROM_CODE(data[0]);
1138         function = TI_GET_FUNC_FROM_CODE(data[0]);
1139
1140         dbg("%s - port_number %d, function %d, data 0x%02X",
1141                                 __func__, port_number, function, data[1]);
1142
1143         if (port_number >= serial->num_ports) {
1144                 dev_err(dev, "%s - bad port number, %d\n",
1145                                                 __func__, port_number);
1146                 goto exit;
1147         }
1148
1149         port = serial->port[port_number];
1150
1151         tport = usb_get_serial_port_data(port);
1152         if (!tport)
1153                 goto exit;
1154
1155         switch (function) {
1156         case TI_CODE_DATA_ERROR:
1157                 dev_err(dev, "%s - DATA ERROR, port %d, data 0x%02X\n",
1158                                         __func__, port_number, data[1]);
1159                 break;
1160
1161         case TI_CODE_MODEM_STATUS:
1162                 msr = data[1];
1163                 dbg("%s - port %d, msr 0x%02X", __func__, port_number, msr);
1164                 ti_handle_new_msr(tport, msr);
1165                 break;
1166
1167         default:
1168                 dev_err(dev, "%s - unknown interrupt code, 0x%02X\n",
1169                                                         __func__, data[1]);
1170                 break;
1171         }
1172
1173 exit:
1174         retval = usb_submit_urb(urb, GFP_ATOMIC);
1175         if (retval)
1176                 dev_err(dev, "%s - resubmit interrupt urb failed, %d\n",
1177                         __func__, retval);
1178 }
1179
1180
1181 static void ti_bulk_in_callback(struct urb *urb)
1182 {
1183         struct ti_port *tport = urb->context;
1184         struct usb_serial_port *port = tport->tp_port;
1185         struct device *dev = &urb->dev->dev;
1186         int status = urb->status;
1187         int retval = 0;
1188         struct tty_struct *tty;
1189
1190         dbg("%s", __func__);
1191
1192         switch (status) {
1193         case 0:
1194                 break;
1195         case -ECONNRESET:
1196         case -ENOENT:
1197         case -ESHUTDOWN:
1198                 dbg("%s - urb shutting down, %d", __func__, status);
1199                 tport->tp_tdev->td_urb_error = 1;
1200                 wake_up_interruptible(&tport->tp_write_wait);
1201                 return;
1202         default:
1203                 dev_err(dev, "%s - nonzero urb status, %d\n",
1204                         __func__, status);
1205                 tport->tp_tdev->td_urb_error = 1;
1206                 wake_up_interruptible(&tport->tp_write_wait);
1207         }
1208
1209         if (status == -EPIPE)
1210                 goto exit;
1211
1212         if (status) {
1213                 dev_err(dev, "%s - stopping read!\n", __func__);
1214                 return;
1215         }
1216
1217         tty = tty_port_tty_get(&port->port);
1218         if (tty && urb->actual_length) {
1219                 usb_serial_debug_data(debug, dev, __func__,
1220                         urb->actual_length, urb->transfer_buffer);
1221
1222                 if (!tport->tp_is_open)
1223                         dbg("%s - port closed, dropping data", __func__);
1224                 else
1225                         ti_recv(&urb->dev->dev, tty,
1226                                                 urb->transfer_buffer,
1227                                                 urb->actual_length);
1228
1229                 spin_lock(&tport->tp_lock);
1230                 tport->tp_icount.rx += urb->actual_length;
1231                 spin_unlock(&tport->tp_lock);
1232                 tty_kref_put(tty);
1233         }
1234
1235 exit:
1236         /* continue to read unless stopping */
1237         spin_lock(&tport->tp_lock);
1238         if (tport->tp_read_urb_state == TI_READ_URB_RUNNING) {
1239                 urb->dev = port->serial->dev;
1240                 retval = usb_submit_urb(urb, GFP_ATOMIC);
1241         } else if (tport->tp_read_urb_state == TI_READ_URB_STOPPING) {
1242                 tport->tp_read_urb_state = TI_READ_URB_STOPPED;
1243         }
1244         spin_unlock(&tport->tp_lock);
1245         if (retval)
1246                 dev_err(dev, "%s - resubmit read urb failed, %d\n",
1247                         __func__, retval);
1248 }
1249
1250
1251 static void ti_bulk_out_callback(struct urb *urb)
1252 {
1253         struct ti_port *tport = urb->context;
1254         struct usb_serial_port *port = tport->tp_port;
1255         struct device *dev = &urb->dev->dev;
1256         int status = urb->status;
1257
1258         dbg("%s - port %d", __func__, port->number);
1259
1260         tport->tp_write_urb_in_use = 0;
1261
1262         switch (status) {
1263         case 0:
1264                 break;
1265         case -ECONNRESET:
1266         case -ENOENT:
1267         case -ESHUTDOWN:
1268                 dbg("%s - urb shutting down, %d", __func__, status);
1269                 tport->tp_tdev->td_urb_error = 1;
1270                 wake_up_interruptible(&tport->tp_write_wait);
1271                 return;
1272         default:
1273                 dev_err(dev, "%s - nonzero urb status, %d\n",
1274                         __func__, status);
1275                 tport->tp_tdev->td_urb_error = 1;
1276                 wake_up_interruptible(&tport->tp_write_wait);
1277         }
1278
1279         /* send any buffered data */
1280         ti_send(tport);
1281 }
1282
1283
1284 static void ti_recv(struct device *dev, struct tty_struct *tty,
1285         unsigned char *data, int length)
1286 {
1287         int cnt;
1288
1289         do {
1290                 cnt = tty_buffer_request_room(tty, length);
1291                 if (cnt < length) {
1292                         dev_err(dev, "%s - dropping data, %d bytes lost\n",
1293                                                 __func__, length - cnt);
1294                         if (cnt == 0)
1295                                 break;
1296                 }
1297                 tty_insert_flip_string(tty, data, cnt);
1298                 tty_flip_buffer_push(tty);
1299                 data += cnt;
1300                 length -= cnt;
1301         } while (length > 0);
1302
1303 }
1304
1305
1306 static void ti_send(struct ti_port *tport)
1307 {
1308         int count, result;
1309         struct usb_serial_port *port = tport->tp_port;
1310         struct tty_struct *tty = tty_port_tty_get(&port->port); /* FIXME */
1311         unsigned long flags;
1312
1313
1314         dbg("%s - port %d", __func__, port->number);
1315
1316         spin_lock_irqsave(&tport->tp_lock, flags);
1317
1318         if (tport->tp_write_urb_in_use)
1319                 goto unlock;
1320
1321         count = ti_buf_get(tport->tp_write_buf,
1322                                 port->write_urb->transfer_buffer,
1323                                 port->bulk_out_size);
1324
1325         if (count == 0)
1326                 goto unlock;
1327
1328         tport->tp_write_urb_in_use = 1;
1329
1330         spin_unlock_irqrestore(&tport->tp_lock, flags);
1331
1332         usb_serial_debug_data(debug, &port->dev, __func__, count,
1333                                         port->write_urb->transfer_buffer);
1334
1335         usb_fill_bulk_urb(port->write_urb, port->serial->dev,
1336                            usb_sndbulkpipe(port->serial->dev,
1337                                             port->bulk_out_endpointAddress),
1338                            port->write_urb->transfer_buffer, count,
1339                            ti_bulk_out_callback, tport);
1340
1341         result = usb_submit_urb(port->write_urb, GFP_ATOMIC);
1342         if (result) {
1343                 dev_err(&port->dev, "%s - submit write urb failed, %d\n",
1344                                                         __func__, result);
1345                 tport->tp_write_urb_in_use = 0;
1346                 /* TODO: reschedule ti_send */
1347         } else {
1348                 spin_lock_irqsave(&tport->tp_lock, flags);
1349                 tport->tp_icount.tx += count;
1350                 spin_unlock_irqrestore(&tport->tp_lock, flags);
1351         }
1352
1353         /* more room in the buffer for new writes, wakeup */
1354         if (tty)
1355                 tty_wakeup(tty);
1356         tty_kref_put(tty);
1357         wake_up_interruptible(&tport->tp_write_wait);
1358         return;
1359 unlock:
1360         spin_unlock_irqrestore(&tport->tp_lock, flags);
1361         tty_kref_put(tty);
1362         return;
1363 }
1364
1365
1366 static int ti_set_mcr(struct ti_port *tport, unsigned int mcr)
1367 {
1368         unsigned long flags;
1369         int status;
1370
1371         status = ti_write_byte(tport->tp_tdev,
1372                 tport->tp_uart_base_addr + TI_UART_OFFSET_MCR,
1373                 TI_MCR_RTS | TI_MCR_DTR | TI_MCR_LOOP, mcr);
1374
1375         spin_lock_irqsave(&tport->tp_lock, flags);
1376         if (!status)
1377                 tport->tp_shadow_mcr = mcr;
1378         spin_unlock_irqrestore(&tport->tp_lock, flags);
1379
1380         return status;
1381 }
1382
1383
1384 static int ti_get_lsr(struct ti_port *tport)
1385 {
1386         int size, status;
1387         struct ti_device *tdev = tport->tp_tdev;
1388         struct usb_serial_port *port = tport->tp_port;
1389         int port_number = port->number - port->serial->minor;
1390         struct ti_port_status *data;
1391
1392         dbg("%s - port %d", __func__, port->number);
1393
1394         size = sizeof(struct ti_port_status);
1395         data = kmalloc(size, GFP_KERNEL);
1396         if (!data) {
1397                 dev_err(&port->dev, "%s - out of memory\n", __func__);
1398                 return -ENOMEM;
1399         }
1400
1401         status = ti_command_in_sync(tdev, TI_GET_PORT_STATUS,
1402                 (__u8)(TI_UART1_PORT+port_number), 0, (__u8 *)data, size);
1403         if (status) {
1404                 dev_err(&port->dev,
1405                         "%s - get port status command failed, %d\n",
1406                                                         __func__, status);
1407                 goto free_data;
1408         }
1409
1410         dbg("%s - lsr 0x%02X", __func__, data->bLSR);
1411
1412         tport->tp_lsr = data->bLSR;
1413
1414 free_data:
1415         kfree(data);
1416         return status;
1417 }
1418
1419
1420 static int ti_get_serial_info(struct ti_port *tport,
1421         struct serial_struct __user *ret_arg)
1422 {
1423         struct usb_serial_port *port = tport->tp_port;
1424         struct serial_struct ret_serial;
1425
1426         if (!ret_arg)
1427                 return -EFAULT;
1428
1429         memset(&ret_serial, 0, sizeof(ret_serial));
1430
1431         ret_serial.type = PORT_16550A;
1432         ret_serial.line = port->serial->minor;
1433         ret_serial.port = port->number - port->serial->minor;
1434         ret_serial.flags = tport->tp_flags;
1435         ret_serial.xmit_fifo_size = TI_WRITE_BUF_SIZE;
1436         ret_serial.baud_base = tport->tp_tdev->td_is_3410 ? 921600 : 460800;
1437         ret_serial.closing_wait = tport->tp_closing_wait;
1438
1439         if (copy_to_user(ret_arg, &ret_serial, sizeof(*ret_arg)))
1440                 return -EFAULT;
1441
1442         return 0;
1443 }
1444
1445
1446 static int ti_set_serial_info(struct tty_struct *tty, struct ti_port *tport,
1447         struct serial_struct __user *new_arg)
1448 {
1449         struct serial_struct new_serial;
1450
1451         if (copy_from_user(&new_serial, new_arg, sizeof(new_serial)))
1452                 return -EFAULT;
1453
1454         tport->tp_flags = new_serial.flags & TI_SET_SERIAL_FLAGS;
1455         tty->low_latency = (tport->tp_flags & ASYNC_LOW_LATENCY) ? 1 : 0;
1456         tport->tp_closing_wait = new_serial.closing_wait;
1457
1458         return 0;
1459 }
1460
1461
1462 static void ti_handle_new_msr(struct ti_port *tport, __u8 msr)
1463 {
1464         struct async_icount *icount;
1465         struct tty_struct *tty;
1466         unsigned long flags;
1467
1468         dbg("%s - msr 0x%02X", __func__, msr);
1469
1470         if (msr & TI_MSR_DELTA_MASK) {
1471                 spin_lock_irqsave(&tport->tp_lock, flags);
1472                 icount = &tport->tp_icount;
1473                 if (msr & TI_MSR_DELTA_CTS)
1474                         icount->cts++;
1475                 if (msr & TI_MSR_DELTA_DSR)
1476                         icount->dsr++;
1477                 if (msr & TI_MSR_DELTA_CD)
1478                         icount->dcd++;
1479                 if (msr & TI_MSR_DELTA_RI)
1480                         icount->rng++;
1481                 wake_up_interruptible(&tport->tp_msr_wait);
1482                 spin_unlock_irqrestore(&tport->tp_lock, flags);
1483         }
1484
1485         tport->tp_msr = msr & TI_MSR_MASK;
1486
1487         /* handle CTS flow control */
1488         tty = tty_port_tty_get(&tport->tp_port->port);
1489         if (tty && C_CRTSCTS(tty)) {
1490                 if (msr & TI_MSR_CTS) {
1491                         tty->hw_stopped = 0;
1492                         tty_wakeup(tty);
1493                 } else {
1494                         tty->hw_stopped = 1;
1495                 }
1496         }
1497         tty_kref_put(tty);
1498 }
1499
1500
1501 static void ti_drain(struct ti_port *tport, unsigned long timeout, int flush)
1502 {
1503         struct ti_device *tdev = tport->tp_tdev;
1504         struct usb_serial_port *port = tport->tp_port;
1505         wait_queue_t wait;
1506
1507         dbg("%s - port %d", __func__, port->number);
1508
1509         spin_lock_irq(&tport->tp_lock);
1510
1511         /* wait for data to drain from the buffer */
1512         tdev->td_urb_error = 0;
1513         init_waitqueue_entry(&wait, current);
1514         add_wait_queue(&tport->tp_write_wait, &wait);
1515         for (;;) {
1516                 set_current_state(TASK_INTERRUPTIBLE);
1517                 if (ti_buf_data_avail(tport->tp_write_buf) == 0
1518                 || timeout == 0 || signal_pending(current)
1519                 || tdev->td_urb_error
1520                 || port->serial->disconnected)  /* disconnect */
1521                         break;
1522                 spin_unlock_irq(&tport->tp_lock);
1523                 timeout = schedule_timeout(timeout);
1524                 spin_lock_irq(&tport->tp_lock);
1525         }
1526         set_current_state(TASK_RUNNING);
1527         remove_wait_queue(&tport->tp_write_wait, &wait);
1528
1529         /* flush any remaining data in the buffer */
1530         if (flush)
1531                 ti_buf_clear(tport->tp_write_buf);
1532
1533         spin_unlock_irq(&tport->tp_lock);
1534
1535         mutex_lock(&port->serial->disc_mutex);
1536         /* wait for data to drain from the device */
1537         /* wait for empty tx register, plus 20 ms */
1538         timeout += jiffies;
1539         tport->tp_lsr &= ~TI_LSR_TX_EMPTY;
1540         while ((long)(jiffies - timeout) < 0 && !signal_pending(current)
1541         && !(tport->tp_lsr&TI_LSR_TX_EMPTY) && !tdev->td_urb_error
1542         && !port->serial->disconnected) {
1543                 if (ti_get_lsr(tport))
1544                         break;
1545                 mutex_unlock(&port->serial->disc_mutex);
1546                 msleep_interruptible(20);
1547                 mutex_lock(&port->serial->disc_mutex);
1548         }
1549         mutex_unlock(&port->serial->disc_mutex);
1550 }
1551
1552
1553 static void ti_stop_read(struct ti_port *tport, struct tty_struct *tty)
1554 {
1555         unsigned long flags;
1556
1557         spin_lock_irqsave(&tport->tp_lock, flags);
1558
1559         if (tport->tp_read_urb_state == TI_READ_URB_RUNNING)
1560                 tport->tp_read_urb_state = TI_READ_URB_STOPPING;
1561
1562         spin_unlock_irqrestore(&tport->tp_lock, flags);
1563 }
1564
1565
1566 static int ti_restart_read(struct ti_port *tport, struct tty_struct *tty)
1567 {
1568         struct urb *urb;
1569         int status = 0;
1570         unsigned long flags;
1571
1572         spin_lock_irqsave(&tport->tp_lock, flags);
1573
1574         if (tport->tp_read_urb_state == TI_READ_URB_STOPPED) {
1575                 tport->tp_read_urb_state = TI_READ_URB_RUNNING;
1576                 urb = tport->tp_port->read_urb;
1577                 spin_unlock_irqrestore(&tport->tp_lock, flags);
1578                 urb->complete = ti_bulk_in_callback;
1579                 urb->context = tport;
1580                 urb->dev = tport->tp_port->serial->dev;
1581                 status = usb_submit_urb(urb, GFP_KERNEL);
1582         } else  {
1583                 tport->tp_read_urb_state = TI_READ_URB_RUNNING;
1584                 spin_unlock_irqrestore(&tport->tp_lock, flags);
1585         }
1586
1587         return status;
1588 }
1589
1590
1591 static int ti_command_out_sync(struct ti_device *tdev, __u8 command,
1592         __u16 moduleid, __u16 value, __u8 *data, int size)
1593 {
1594         int status;
1595
1596         status = usb_control_msg(tdev->td_serial->dev,
1597                 usb_sndctrlpipe(tdev->td_serial->dev, 0), command,
1598                 (USB_TYPE_VENDOR | USB_RECIP_DEVICE | USB_DIR_OUT),
1599                 value, moduleid, data, size, 1000);
1600
1601         if (status == size)
1602                 status = 0;
1603
1604         if (status > 0)
1605                 status = -ECOMM;
1606
1607         return status;
1608 }
1609
1610
1611 static int ti_command_in_sync(struct ti_device *tdev, __u8 command,
1612         __u16 moduleid, __u16 value, __u8 *data, int size)
1613 {
1614         int status;
1615
1616         status = usb_control_msg(tdev->td_serial->dev,
1617                 usb_rcvctrlpipe(tdev->td_serial->dev, 0), command,
1618                 (USB_TYPE_VENDOR | USB_RECIP_DEVICE | USB_DIR_IN),
1619                 value, moduleid, data, size, 1000);
1620
1621         if (status == size)
1622                 status = 0;
1623
1624         if (status > 0)
1625                 status = -ECOMM;
1626
1627         return status;
1628 }
1629
1630
1631 static int ti_write_byte(struct ti_device *tdev, unsigned long addr,
1632         __u8 mask, __u8 byte)
1633 {
1634         int status;
1635         unsigned int size;
1636         struct ti_write_data_bytes *data;
1637         struct device *dev = &tdev->td_serial->dev->dev;
1638
1639         dbg("%s - addr 0x%08lX, mask 0x%02X, byte 0x%02X",
1640                                         __func__, addr, mask, byte);
1641
1642         size = sizeof(struct ti_write_data_bytes) + 2;
1643         data = kmalloc(size, GFP_KERNEL);
1644         if (!data) {
1645                 dev_err(dev, "%s - out of memory\n", __func__);
1646                 return -ENOMEM;
1647         }
1648
1649         data->bAddrType = TI_RW_DATA_ADDR_XDATA;
1650         data->bDataType = TI_RW_DATA_BYTE;
1651         data->bDataCounter = 1;
1652         data->wBaseAddrHi = cpu_to_be16(addr>>16);
1653         data->wBaseAddrLo = cpu_to_be16(addr);
1654         data->bData[0] = mask;
1655         data->bData[1] = byte;
1656
1657         status = ti_command_out_sync(tdev, TI_WRITE_DATA, TI_RAM_PORT, 0,
1658                 (__u8 *)data, size);
1659
1660         if (status < 0)
1661                 dev_err(dev, "%s - failed, %d\n", __func__, status);
1662
1663         kfree(data);
1664
1665         return status;
1666 }
1667
1668 static int ti_do_download(struct usb_device *dev, int pipe,
1669                                                 u8 *buffer, int size)
1670 {
1671         int pos;
1672         u8 cs = 0;
1673         int done;
1674         struct ti_firmware_header *header;
1675         int status;
1676         int len;
1677
1678         for (pos = sizeof(struct ti_firmware_header); pos < size; pos++)
1679                 cs = (__u8)(cs + buffer[pos]);
1680
1681         header = (struct ti_firmware_header *)buffer;
1682         header->wLength = cpu_to_le16((__u16)(size
1683                                         - sizeof(struct ti_firmware_header)));
1684         header->bCheckSum = cs;
1685
1686         dbg("%s - downloading firmware", __func__);
1687         for (pos = 0; pos < size; pos += done) {
1688                 len = min(size - pos, TI_DOWNLOAD_MAX_PACKET_SIZE);
1689                 status = usb_bulk_msg(dev, pipe, buffer + pos, len,
1690                                                                 &done, 1000);
1691                 if (status)
1692                         break;
1693         }
1694         return status;
1695 }
1696
1697 static int ti_download_firmware(struct ti_device *tdev)
1698 {
1699         int status;
1700         int buffer_size;
1701         __u8 *buffer;
1702         struct usb_device *dev = tdev->td_serial->dev;
1703         unsigned int pipe = usb_sndbulkpipe(dev,
1704                 tdev->td_serial->port[0]->bulk_out_endpointAddress);
1705         const struct firmware *fw_p;
1706         char buf[32];
1707
1708         /* try ID specific firmware first, then try generic firmware */
1709         sprintf(buf, "ti_usb-v%04x-p%04x.fw", dev->descriptor.idVendor,
1710             dev->descriptor.idProduct);
1711         if ((status = request_firmware(&fw_p, buf, &dev->dev)) != 0) {
1712                 buf[0] = '\0';
1713                 if (dev->descriptor.idVendor == MTS_VENDOR_ID) {
1714                         switch (dev->descriptor.idProduct) {
1715                         case MTS_CDMA_PRODUCT_ID:
1716                                 strcpy(buf, "mts_cdma.fw");
1717                                 break;
1718                         case MTS_GSM_PRODUCT_ID:
1719                                 strcpy(buf, "mts_gsm.fw");
1720                                 break;
1721                         case MTS_EDGE_PRODUCT_ID:
1722                                 strcpy(buf, "mts_edge.fw");
1723                                 break;
1724                         }
1725                 }
1726                 if (buf[0] == '\0') {
1727                         if (tdev->td_is_3410)
1728                                 strcpy(buf, "ti_3410.fw");
1729                         else
1730                                 strcpy(buf, "ti_5052.fw");
1731                 }
1732                 status = request_firmware(&fw_p, buf, &dev->dev);
1733         }
1734         if (status) {
1735                 dev_err(&dev->dev, "%s - firmware not found\n", __func__);
1736                 return -ENOENT;
1737         }
1738         if (fw_p->size > TI_FIRMWARE_BUF_SIZE) {
1739                 dev_err(&dev->dev, "%s - firmware too large\n", __func__);
1740                 return -ENOENT;
1741         }
1742
1743         buffer_size = TI_FIRMWARE_BUF_SIZE + sizeof(struct ti_firmware_header);
1744         buffer = kmalloc(buffer_size, GFP_KERNEL);
1745         if (buffer) {
1746                 memcpy(buffer, fw_p->data, fw_p->size);
1747                 memset(buffer + fw_p->size, 0xff, buffer_size - fw_p->size);
1748                 status = ti_do_download(dev, pipe, buffer, fw_p->size);
1749                 kfree(buffer);
1750         } else {
1751                 status = -ENOMEM;
1752         }
1753         release_firmware(fw_p);
1754         if (status) {
1755                 dev_err(&dev->dev, "%s - error downloading firmware, %d\n",
1756                                                         __func__, status);
1757                 return status;
1758         }
1759
1760         dbg("%s - download successful", __func__);
1761
1762         return 0;
1763 }
1764
1765
1766 /* Circular Buffer Functions */
1767
1768 /*
1769  * ti_buf_alloc
1770  *
1771  * Allocate a circular buffer and all associated memory.
1772  */
1773
1774 static struct circ_buf *ti_buf_alloc(void)
1775 {
1776         struct circ_buf *cb;
1777
1778         cb = kmalloc(sizeof(struct circ_buf), GFP_KERNEL);
1779         if (cb == NULL)
1780                 return NULL;
1781
1782         cb->buf = kmalloc(TI_WRITE_BUF_SIZE, GFP_KERNEL);
1783         if (cb->buf == NULL) {
1784                 kfree(cb);
1785                 return NULL;
1786         }
1787
1788         ti_buf_clear(cb);
1789
1790         return cb;
1791 }
1792
1793
1794 /*
1795  * ti_buf_free
1796  *
1797  * Free the buffer and all associated memory.
1798  */
1799
1800 static void ti_buf_free(struct circ_buf *cb)
1801 {
1802         kfree(cb->buf);
1803         kfree(cb);
1804 }
1805
1806
1807 /*
1808  * ti_buf_clear
1809  *
1810  * Clear out all data in the circular buffer.
1811  */
1812
1813 static void ti_buf_clear(struct circ_buf *cb)
1814 {
1815         cb->head = cb->tail = 0;
1816 }
1817
1818
1819 /*
1820  * ti_buf_data_avail
1821  *
1822  * Return the number of bytes of data available in the circular
1823  * buffer.
1824  */
1825
1826 static int ti_buf_data_avail(struct circ_buf *cb)
1827 {
1828         return CIRC_CNT(cb->head, cb->tail, TI_WRITE_BUF_SIZE);
1829 }
1830
1831
1832 /*
1833  * ti_buf_space_avail
1834  *
1835  * Return the number of bytes of space available in the circular
1836  * buffer.
1837  */
1838
1839 static int ti_buf_space_avail(struct circ_buf *cb)
1840 {
1841         return CIRC_SPACE(cb->head, cb->tail, TI_WRITE_BUF_SIZE);
1842 }
1843
1844
1845 /*
1846  * ti_buf_put
1847  *
1848  * Copy data data from a user buffer and put it into the circular buffer.
1849  * Restrict to the amount of space available.
1850  *
1851  * Return the number of bytes copied.
1852  */
1853
1854 static int ti_buf_put(struct circ_buf *cb, const char *buf, int count)
1855 {
1856         int c, ret = 0;
1857
1858         while (1) {
1859                 c = CIRC_SPACE_TO_END(cb->head, cb->tail, TI_WRITE_BUF_SIZE);
1860                 if (count < c)
1861                         c = count;
1862                 if (c <= 0)
1863                         break;
1864                 memcpy(cb->buf + cb->head, buf, c);
1865                 cb->head = (cb->head + c) & (TI_WRITE_BUF_SIZE-1);
1866                 buf += c;
1867                 count -= c;
1868                 ret += c;
1869         }
1870
1871         return ret;
1872 }
1873
1874
1875 /*
1876  * ti_buf_get
1877  *
1878  * Get data from the circular buffer and copy to the given buffer.
1879  * Restrict to the amount of data available.
1880  *
1881  * Return the number of bytes copied.
1882  */
1883
1884 static int ti_buf_get(struct circ_buf *cb, char *buf, int count)
1885 {
1886         int c, ret = 0;
1887
1888         while (1) {
1889                 c = CIRC_CNT_TO_END(cb->head, cb->tail, TI_WRITE_BUF_SIZE);
1890                 if (count < c)
1891                         c = count;
1892                 if (c <= 0)
1893                         break;
1894                 memcpy(buf, cb->buf + cb->tail, c);
1895                 cb->tail = (cb->tail + c) & (TI_WRITE_BUF_SIZE-1);
1896                 buf += c;
1897                 count -= c;
1898                 ret += c;
1899         }
1900
1901         return ret;
1902 }