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