SAFE public projects git trees. - safe/jmp/linux-2.6/blob - drivers/usb/serial/ti_usb_3410_5052.c

   1 /* vi: ts=8 sw=8
   2  *
   3  * TI 3410/5052 USB Serial Driver
   4  *
   5  * Copyright (C) 2004 Texas Instruments
   6  *
   7  * This driver is based on the Linux io_ti driver, which is
   8  *   Copyright (C) 2000-2002 Inside Out Networks
   9  *   Copyright (C) 2001-2002 Greg Kroah-Hartman
  10  *
  11  * This program is free software; you can redistribute it and/or modify
  12  * it under the terms of the GNU General Public License as published by
  13  * the Free Software Foundation; either version 2 of the License, or
  14  * (at your option) any later version.
  15  *
  16  * For questions or problems with this driver, contact Texas Instruments
  17  * technical support, or Al Borchers <alborchers@steinerpoint.com>, or
  18  * Peter Berger <pberger@brimson.com>.
  19  */
  20
  21 #include <linux/kernel.h>
  22 #include <linux/errno.h>
  23 #include <linux/firmware.h>
  24 #include <linux/init.h>
  25 #include <linux/slab.h>
  26 #include <linux/tty.h>
  27 #include <linux/tty_driver.h>
  28 #include <linux/tty_flip.h>
  29 #include <linux/module.h>
  30 #include <linux/spinlock.h>
  31 #include <linux/ioctl.h>
  32 #include <linux/serial.h>
  33 #include <linux/circ_buf.h>
  34 #include <linux/mutex.h>
  35 #include <linux/uaccess.h>
  36 #include <linux/usb.h>
  37 #include <linux/usb/serial.h>
  38
  39 #include "ti_usb_3410_5052.h"
  40
  41 /* Defines */
  42
  43 #define TI_DRIVER_VERSION       "v0.9"
  44 #define TI_DRIVER_AUTHOR        "Al Borchers <alborchers@steinerpoint.com>"
  45 #define TI_DRIVER_DESC          "TI USB 3410/5052 Serial Driver"
  46
  47 #define TI_FIRMWARE_BUF_SIZE    16284
  48
  49 #define TI_WRITE_BUF_SIZE       1024
  50
  51 #define TI_TRANSFER_TIMEOUT     2
  52
  53 #define TI_DEFAULT_LOW_LATENCY  0
  54 #define TI_DEFAULT_CLOSING_WAIT 4000            /* in .01 secs */
  55
  56 /* supported setserial flags */
  57 #define TI_SET_SERIAL_FLAGS     (ASYNC_LOW_LATENCY)
  58
  59 /* read urb states */
  60 #define TI_READ_URB_RUNNING     0
  61 #define TI_READ_URB_STOPPING    1
  62 #define TI_READ_URB_STOPPED     2
  63
  64 #define TI_EXTRA_VID_PID_COUNT  5
  65
  66
  67 /* Structures */
  68
  69 struct ti_port {
  70         int                     tp_is_open;
  71         __u8                    tp_msr;
  72         __u8                    tp_lsr;
  73         __u8                    tp_shadow_mcr;
  74         __u8                    tp_uart_mode;   /* 232 or 485 modes */
  75         unsigned int            tp_uart_base_addr;
  76         int                     tp_flags;
  77         int                     tp_closing_wait;/* in .01 secs */
  78         struct async_icount     tp_icount;
  79         wait_queue_head_t       tp_msr_wait;    /* wait for msr change */
  80         wait_queue_head_t       tp_write_wait;
  81         struct ti_device        *tp_tdev;
  82         struct usb_serial_port  *tp_port;
  83         spinlock_t              tp_lock;
  84         int                     tp_read_urb_state;
  85         int                     tp_write_urb_in_use;
  86         struct circ_buf         *tp_write_buf;
  87 };
  88
  89 struct ti_device {
  90         struct mutex            td_open_close_lock;
  91         int                     td_open_port_count;
  92         struct usb_serial       *td_serial;
  93         int                     td_is_3410;
  94         int                     td_urb_error;
  95 };
  96
  97
  98 /* Function Declarations */
  99
 100 static int ti_startup(struct usb_serial *serial);
 101 static void ti_shutdown(struct usb_serial *serial);
 102 static int ti_open(struct tty_struct *tty, struct usb_serial_port *port,
 103                 struct file *file);
 104 static void ti_close(struct tty_struct *tty, struct usb_serial_port *port,
 105                 struct file *file);
 106 static int ti_write(struct tty_struct *tty, struct usb_serial_port *port,
 107                 const unsigned char *data, int count);
 108 static int ti_write_room(struct tty_struct *tty);
 109 static int ti_chars_in_buffer(struct tty_struct *tty);
 110 static void ti_throttle(struct tty_struct *tty);
 111 static void ti_unthrottle(struct tty_struct *tty);
 112 static int ti_ioctl(struct tty_struct *tty, struct file *file,
 113                 unsigned int cmd, unsigned long arg);
 114 static void ti_set_termios(struct tty_struct *tty,
 115                 struct usb_serial_port *port, struct ktermios *old_termios);
 116 static int ti_tiocmget(struct tty_struct *tty, struct file *file);
 117 static int ti_tiocmset(struct tty_struct *tty, struct file *file,
 118                 unsigned int set, unsigned int clear);
 119 static void ti_break(struct tty_struct *tty, int break_state);
 120 static void ti_interrupt_callback(struct urb *urb);
 121 static void ti_bulk_in_callback(struct urb *urb);
 122 static void ti_bulk_out_callback(struct urb *urb);
 123
 124 static void ti_recv(struct device *dev, struct tty_struct *tty,
 125         unsigned char *data, int length);
 126 static void ti_send(struct ti_port *tport);
 127 static int ti_set_mcr(struct ti_port *tport, unsigned int mcr);
 128 static int ti_get_lsr(struct ti_port *tport);
 129 static int ti_get_serial_info(struct ti_port *tport,
 130         struct serial_struct __user *ret_arg);
 131 static int ti_set_serial_info(struct tty_struct *tty, struct ti_port *tport,
 132         struct serial_struct __user *new_arg);
 133 static void ti_handle_new_msr(struct ti_port *tport, __u8 msr);
 134
 135 static void ti_drain(struct ti_port *tport, unsigned long timeout, int flush);
 136
 137 static void ti_stop_read(struct ti_port *tport, struct tty_struct *tty);
 138 static int ti_restart_read(struct ti_port *tport, struct tty_struct *tty);
 139
 140 static int ti_command_out_sync(struct ti_device *tdev, __u8 command,
 141         __u16 moduleid, __u16 value, __u8 *data, int size);
 142 static int ti_command_in_sync(struct ti_device *tdev, __u8 command,
 143         __u16 moduleid, __u16 value, __u8 *data, int size);
 144
 145 static int ti_write_byte(struct ti_device *tdev, unsigned long addr,
 146         __u8 mask, __u8 byte);
 147
 148 static int ti_download_firmware(struct ti_device *tdev);
 149
 150 /* circular buffer */
 151 static struct circ_buf *ti_buf_alloc(void);
 152 static void ti_buf_free(struct circ_buf *cb);
 153 static void ti_buf_clear(struct circ_buf *cb);
 154 static int ti_buf_data_avail(struct circ_buf *cb);
 155 static int ti_buf_space_avail(struct circ_buf *cb);
 156 static int ti_buf_put(struct circ_buf *cb, const char *buf, int count);
 157 static int ti_buf_get(struct circ_buf *cb, char *buf, int count);
 158
 159
 160 /* Data */
 161
 162 /* module parameters */
 163 static int debug;
 164 static int low_latency = TI_DEFAULT_LOW_LATENCY;
 165 static int closing_wait = TI_DEFAULT_CLOSING_WAIT;
 166 static ushort vendor_3410[TI_EXTRA_VID_PID_COUNT];
 167 static unsigned int vendor_3410_count;
 168 static ushort product_3410[TI_EXTRA_VID_PID_COUNT];
 169 static unsigned int product_3410_count;
 170 static ushort vendor_5052[TI_EXTRA_VID_PID_COUNT];
 171 static unsigned int vendor_5052_count;
 172 static ushort product_5052[TI_EXTRA_VID_PID_COUNT];
 173 static unsigned int product_5052_count;
 174
 175 /* supported devices */
 176 /* the array dimension is the number of default entries plus */
 177 /* TI_EXTRA_VID_PID_COUNT user defined entries plus 1 terminating */
 178 /* null entry */
 179 static struct usb_device_id ti_id_table_3410[7+TI_EXTRA_VID_PID_COUNT+1] = {
 180         { USB_DEVICE(TI_VENDOR_ID, TI_3410_PRODUCT_ID) },
 181         { USB_DEVICE(TI_VENDOR_ID, TI_3410_EZ430_ID) },
 182         { USB_DEVICE(MTS_VENDOR_ID, MTS_GSM_NO_FW_PRODUCT_ID) },
 183         { USB_DEVICE(MTS_VENDOR_ID, MTS_CDMA_NO_FW_PRODUCT_ID) },
 184         { USB_DEVICE(MTS_VENDOR_ID, MTS_CDMA_PRODUCT_ID) },
 185         { USB_DEVICE(MTS_VENDOR_ID, MTS_GSM_PRODUCT_ID) },
 186         { USB_DEVICE(MTS_VENDOR_ID, MTS_EDGE_PRODUCT_ID) },
 187 };
 188
 189 static struct usb_device_id ti_id_table_5052[4+TI_EXTRA_VID_PID_COUNT+1] = {
 190         { USB_DEVICE(TI_VENDOR_ID, TI_5052_BOOT_PRODUCT_ID) },
 191         { USB_DEVICE(TI_VENDOR_ID, TI_5152_BOOT_PRODUCT_ID) },
 192         { USB_DEVICE(TI_VENDOR_ID, TI_5052_EEPROM_PRODUCT_ID) },
 193         { USB_DEVICE(TI_VENDOR_ID, TI_5052_FIRMWARE_PRODUCT_ID) },
 194 };
 195
 196 static struct usb_device_id ti_id_table_combined[6+2*TI_EXTRA_VID_PID_COUNT+1] = {
 197         { USB_DEVICE(TI_VENDOR_ID, TI_3410_PRODUCT_ID) },
 198         { USB_DEVICE(TI_VENDOR_ID, TI_3410_EZ430_ID) },
 199         { USB_DEVICE(MTS_VENDOR_ID, MTS_GSM_NO_FW_PRODUCT_ID) },
 200         { USB_DEVICE(MTS_VENDOR_ID, MTS_CDMA_NO_FW_PRODUCT_ID) },
 201         { USB_DEVICE(MTS_VENDOR_ID, MTS_CDMA_PRODUCT_ID) },
 202         { USB_DEVICE(MTS_VENDOR_ID, MTS_GSM_PRODUCT_ID) },
 203         { USB_DEVICE(MTS_VENDOR_ID, MTS_EDGE_PRODUCT_ID) },
 204         { USB_DEVICE(TI_VENDOR_ID, TI_5052_BOOT_PRODUCT_ID) },
 205         { USB_DEVICE(TI_VENDOR_ID, TI_5152_BOOT_PRODUCT_ID) },
 206         { USB_DEVICE(TI_VENDOR_ID, TI_5052_EEPROM_PRODUCT_ID) },
 207         { USB_DEVICE(TI_VENDOR_ID, TI_5052_FIRMWARE_PRODUCT_ID) },
 208         { }
 209 };
 210
 211 static struct usb_driver ti_usb_driver = {
 212         .name                   = "ti_usb_3410_5052",
 213         .probe                  = usb_serial_probe,
 214         .disconnect             = usb_serial_disconnect,
 215         .id_table               = ti_id_table_combined,
 216         .no_dynamic_id =        1,
 217 };
 218
 219 static struct usb_serial_driver ti_1port_device = {
 220         .driver = {
 221                 .owner          = THIS_MODULE,
 222                 .name           = "ti_usb_3410_5052_1",
 223         },
 224         .description            = "TI USB 3410 1 port adapter",
 225         .usb_driver             = &ti_usb_driver,
 226         .id_table               = ti_id_table_3410,
 227         .num_ports              = 1,
 228         .attach                 = ti_startup,
 229         .shutdown               = ti_shutdown,
 230         .open                   = ti_open,
 231         .close                  = ti_close,
 232         .write                  = ti_write,
 233         .write_room             = ti_write_room,
 234         .chars_in_buffer        = ti_chars_in_buffer,
 235         .throttle               = ti_throttle,
 236         .unthrottle             = ti_unthrottle,
 237         .ioctl                  = ti_ioctl,
 238         .set_termios            = ti_set_termios,
 239         .tiocmget               = ti_tiocmget,
 240         .tiocmset               = ti_tiocmset,
 241         .break_ctl              = ti_break,
 242         .read_int_callback      = ti_interrupt_callback,
 243         .read_bulk_callback     = ti_bulk_in_callback,
 244         .write_bulk_callback    = ti_bulk_out_callback,
 245 };
 246
 247 static struct usb_serial_driver ti_2port_device = {
 248         .driver = {
 249                 .owner          = THIS_MODULE,
 250                 .name           = "ti_usb_3410_5052_2",
 251         },
 252         .description            = "TI USB 5052 2 port adapter",
 253         .usb_driver             = &ti_usb_driver,
 254         .id_table               = ti_id_table_5052,
 255         .num_ports              = 2,
 256         .attach                 = ti_startup,
 257         .shutdown               = ti_shutdown,
 258         .open                   = ti_open,
 259         .close                  = ti_close,
 260         .write                  = ti_write,
 261         .write_room             = ti_write_room,
 262         .chars_in_buffer        = ti_chars_in_buffer,
 263         .throttle               = ti_throttle,
 264         .unthrottle             = ti_unthrottle,
 265         .ioctl                  = ti_ioctl,
 266         .set_termios            = ti_set_termios,
 267         .tiocmget               = ti_tiocmget,
 268         .tiocmset               = ti_tiocmset,
 269         .break_ctl              = ti_break,
 270         .read_int_callback      = ti_interrupt_callback,
 271         .read_bulk_callback     = ti_bulk_in_callback,
 272         .write_bulk_callback    = ti_bulk_out_callback,
 273 };
 274
 275
 276 /* Module */
 277
 278 MODULE_AUTHOR(TI_DRIVER_AUTHOR);
 279 MODULE_DESCRIPTION(TI_DRIVER_DESC);
 280 MODULE_VERSION(TI_DRIVER_VERSION);
 281 MODULE_LICENSE("GPL");
 282
 283 MODULE_FIRMWARE("ti_3410.fw");
 284 MODULE_FIRMWARE("ti_5052.fw");
 285 MODULE_FIRMWARE("mts_cdma.fw");
 286 MODULE_FIRMWARE("mts_gsm.fw");
 287 MODULE_FIRMWARE("mts_edge.fw");
 288
 289 module_param(debug, bool, S_IRUGO | S_IWUSR);
 290 MODULE_PARM_DESC(debug, "Enable debugging, 0=no, 1=yes");
 291
 292 module_param(low_latency, bool, S_IRUGO | S_IWUSR);
 293 MODULE_PARM_DESC(low_latency,
 294                 "TTY low_latency flag, 0=off, 1=on, default is off");
 295
 296 module_param(closing_wait, int, S_IRUGO | S_IWUSR);
 297 MODULE_PARM_DESC(closing_wait,
 298     "Maximum wait for data to drain in close, in .01 secs, default is 4000");
 299
 300 module_param_array(vendor_3410, ushort, &vendor_3410_count, S_IRUGO);
 301 MODULE_PARM_DESC(vendor_3410,
 302                 "Vendor ids for 3410 based devices, 1-5 short integers");
 303 module_param_array(product_3410, ushort, &product_3410_count, S_IRUGO);
 304 MODULE_PARM_DESC(product_3410,
 305                 "Product ids for 3410 based devices, 1-5 short integers");
 306 module_param_array(vendor_5052, ushort, &vendor_5052_count, S_IRUGO);
 307 MODULE_PARM_DESC(vendor_5052,
 308                 "Vendor ids for 5052 based devices, 1-5 short integers");
 309 module_param_array(product_5052, ushort, &product_5052_count, S_IRUGO);
 310 MODULE_PARM_DESC(product_5052,
 311                 "Product ids for 5052 based devices, 1-5 short integers");
 312
 313 MODULE_DEVICE_TABLE(usb, ti_id_table_combined);
 314
 315
 316 /* Functions */
 317
 318 static int __init ti_init(void)
 319 {
 320         int i, j, c;
 321         int ret;
 322
 323         /* insert extra vendor and product ids */
 324         c = ARRAY_SIZE(ti_id_table_combined) - 2 * TI_EXTRA_VID_PID_COUNT - 1;
 325         j = ARRAY_SIZE(ti_id_table_3410) - TI_EXTRA_VID_PID_COUNT - 1;
 326         for (i = 0; i < min(vendor_3410_count, product_3410_count); i++, j++, c++) {
 327                 ti_id_table_3410[j].idVendor = vendor_3410[i];
 328                 ti_id_table_3410[j].idProduct = product_3410[i];
 329                 ti_id_table_3410[j].match_flags = USB_DEVICE_ID_MATCH_DEVICE;
 330                 ti_id_table_combined[c].idVendor = vendor_3410[i];
 331                 ti_id_table_combined[c].idProduct = product_3410[i];
 332                 ti_id_table_combined[c].match_flags = USB_DEVICE_ID_MATCH_DEVICE;
 333         }
 334         j = ARRAY_SIZE(ti_id_table_5052) - TI_EXTRA_VID_PID_COUNT - 1;
 335         for (i = 0; i < min(vendor_5052_count, product_5052_count); i++, j++, c++) {
 336                 ti_id_table_5052[j].idVendor = vendor_5052[i];
 337                 ti_id_table_5052[j].idProduct = product_5052[i];
 338                 ti_id_table_5052[j].match_flags = USB_DEVICE_ID_MATCH_DEVICE;
 339                 ti_id_table_combined[c].idVendor = vendor_5052[i];
 340                 ti_id_table_combined[c].idProduct = product_5052[i];
 341                 ti_id_table_combined[c].match_flags = USB_DEVICE_ID_MATCH_DEVICE;
 342         }
 343
 344         ret = usb_serial_register(&ti_1port_device);
 345         if (ret)
 346                 goto failed_1port;
 347         ret = usb_serial_register(&ti_2port_device);
 348         if (ret)
 349                 goto failed_2port;
 350
 351         ret = usb_register(&ti_usb_driver);
 352         if (ret)
 353                 goto failed_usb;
 354
 355         printk(KERN_INFO KBUILD_MODNAME ": " TI_DRIVER_VERSION ":"
 356                TI_DRIVER_DESC "\n");
 357
 358         return 0;
 359
 360 failed_usb:
 361         usb_serial_deregister(&ti_2port_device);
 362 failed_2port:
 363         usb_serial_deregister(&ti_1port_device);
 364 failed_1port:
 365         return ret;
 366 }
 367
 368
 369 static void __exit ti_exit(void)
 370 {
 371         usb_serial_deregister(&ti_1port_device);
 372         usb_serial_deregister(&ti_2port_device);
 373         usb_deregister(&ti_usb_driver);
 374 }
 375
 376
 377 module_init(ti_init);
 378 module_exit(ti_exit);
 379
 380
 381 static int ti_startup(struct usb_serial *serial)
 382 {
 383         struct ti_device *tdev;
 384         struct ti_port *tport;
 385         struct usb_device *dev = serial->dev;
 386         int status;
 387         int i;
 388
 389
 390         dbg("%s - product 0x%4X, num configurations %d, configuration value %d",
 391             __func__, le16_to_cpu(dev->descriptor.idProduct),
 392             dev->descriptor.bNumConfigurations,
 393             dev->actconfig->desc.bConfigurationValue);
 394
 395         /* create device structure */
 396         tdev = kzalloc(sizeof(struct ti_device), GFP_KERNEL);
 397         if (tdev == NULL) {
 398                 dev_err(&dev->dev, "%s - out of memory\n", __func__);
 399                 return -ENOMEM;
 400         }
 401         mutex_init(&tdev->td_open_close_lock);
 402         tdev->td_serial = serial;
 403         usb_set_serial_data(serial, tdev);
 404
 405         /* determine device type */
 406         if (usb_match_id(serial->interface, ti_id_table_3410))
 407                 tdev->td_is_3410 = 1;
 408         dbg("%s - device type is %s", __func__,
 409                                 tdev->td_is_3410 ? "3410" : "5052");
 410
 411         /* if we have only 1 configuration, download firmware */
 412         if (dev->descriptor.bNumConfigurations == 1) {
 413                 if ((status = ti_download_firmware(tdev)) != 0)
 414                         goto free_tdev;
 415
 416                 /* 3410 must be reset, 5052 resets itself */
 417                 if (tdev->td_is_3410) {
 418                         msleep_interruptible(100);
 419                         usb_reset_device(dev);
 420                 }
 421
 422                 status = -ENODEV;
 423                 goto free_tdev;
 424         }
 425
 426         /* the second configuration must be set */
 427         if (dev->actconfig->desc.bConfigurationValue == TI_BOOT_CONFIG) {
 428                 status = usb_driver_set_configuration(dev, TI_ACTIVE_CONFIG);
 429                 status = status ? status : -ENODEV;
 430                 goto free_tdev;
 431         }
 432
 433         /* set up port structures */
 434         for (i = 0; i < serial->num_ports; ++i) {
 435                 tport = kzalloc(sizeof(struct ti_port), GFP_KERNEL);
 436                 if (tport == NULL) {
 437                         dev_err(&dev->dev, "%s - out of memory\n", __func__);
 438                         status = -ENOMEM;
 439                         goto free_tports;
 440                 }
 441                 spin_lock_init(&tport->tp_lock);
 442                 tport->tp_uart_base_addr = (i == 0 ?
 443                                 TI_UART1_BASE_ADDR : TI_UART2_BASE_ADDR);
 444                 tport->tp_flags = low_latency ? ASYNC_LOW_LATENCY : 0;
 445                 tport->tp_closing_wait = closing_wait;
 446                 init_waitqueue_head(&tport->tp_msr_wait);
 447                 init_waitqueue_head(&tport->tp_write_wait);
 448                 tport->tp_write_buf = ti_buf_alloc();
 449                 if (tport->tp_write_buf == NULL) {
 450                         dev_err(&dev->dev, "%s - out of memory\n", __func__);
 451                         kfree(tport);
 452                         status = -ENOMEM;
 453                         goto free_tports;
 454                 }
 455                 tport->tp_port = serial->port[i];
 456                 tport->tp_tdev = tdev;
 457                 usb_set_serial_port_data(serial->port[i], tport);
 458                 tport->tp_uart_mode = 0;        /* default is RS232 */
 459         }
 460
 461         return 0;
 462
 463 free_tports:
 464         for (--i; i >= 0; --i) {
 465                 tport = usb_get_serial_port_data(serial->port[i]);
 466                 ti_buf_free(tport->tp_write_buf);
 467                 kfree(tport);
 468                 usb_set_serial_port_data(serial->port[i], NULL);
 469         }
 470 free_tdev:
 471         kfree(tdev);
 472         usb_set_serial_data(serial, NULL);
 473         return status;
 474 }
 475
 476
 477 static void ti_shutdown(struct usb_serial *serial)
 478 {
 479         int i;
 480         struct ti_device *tdev = usb_get_serial_data(serial);
 481         struct ti_port *tport;
 482
 483         dbg("%s", __func__);
 484
 485         for (i = 0; i < serial->num_ports; ++i) {
 486                 tport = usb_get_serial_port_data(serial->port[i]);
 487                 if (tport) {
 488                         ti_buf_free(tport->tp_write_buf);
 489                         kfree(tport);
 490                         usb_set_serial_port_data(serial->port[i], NULL);
 491                 }
 492         }
 493
 494         kfree(tdev);
 495         usb_set_serial_data(serial, NULL);
 496 }
 497
 498
 499 static int ti_open(struct tty_struct *tty,
 500                         struct usb_serial_port *port, struct file *file)
 501 {
 502         struct ti_port *tport = usb_get_serial_port_data(port);
 503         struct ti_device *tdev;
 504         struct usb_device *dev;
 505         struct urb *urb;
 506         int port_number;
 507         int status;
 508         __u16 open_settings = (__u8)(TI_PIPE_MODE_CONTINOUS |
 509                              TI_PIPE_TIMEOUT_ENABLE |
 510                              (TI_TRANSFER_TIMEOUT << 2));
 511
 512         dbg("%s - port %d", __func__, port->number);
 513
 514         if (tport == NULL)
 515                 return -ENODEV;
 516
 517         dev = port->serial->dev;
 518         tdev = tport->tp_tdev;
 519
 520         /* only one open on any port on a device at a time */
 521         if (mutex_lock_interruptible(&tdev->td_open_close_lock))
 522                 return -ERESTARTSYS;
 523
 524         if (tty)
 525                 tty->low_latency =
 526                                 (tport->tp_flags & ASYNC_LOW_LATENCY) ? 1 : 0;
 527
 528         port_number = port->number - port->serial->minor;
 529
 530         memset(&(tport->tp_icount), 0x00, sizeof(tport->tp_icount));
 531
 532         tport->tp_msr = 0;
 533         tport->tp_shadow_mcr |= (TI_MCR_RTS | TI_MCR_DTR);
 534
 535         /* start interrupt urb the first time a port is opened on this device */
 536         if (tdev->td_open_port_count == 0) {
 537                 dbg("%s - start interrupt in urb", __func__);
 538                 urb = tdev->td_serial->port[0]->interrupt_in_urb;
 539                 if (!urb) {
 540                         dev_err(&port->dev, "%s - no interrupt urb\n",
 541                                                                 __func__);
 542                         status = -EINVAL;
 543                         goto release_lock;
 544                 }
 545                 urb->complete = ti_interrupt_callback;
 546                 urb->context = tdev;
 547                 urb->dev = dev;
 548                 status = usb_submit_urb(urb, GFP_KERNEL);
 549                 if (status) {
 550                         dev_err(&port->dev,
 551                                 "%s - submit interrupt urb failed, %d\n",
 552                                         __func__, status);
 553                         goto release_lock;
 554                 }
 555         }
 556
 557         if (tty)
 558                 ti_set_termios(tty, port, tty->termios);
 559
 560         dbg("%s - sending TI_OPEN_PORT", __func__);
 561         status = ti_command_out_sync(tdev, TI_OPEN_PORT,
 562                 (__u8)(TI_UART1_PORT + port_number), open_settings, NULL, 0);
 563         if (status) {
 564                 dev_err(&port->dev, "%s - cannot send open command, %d\n",
 565                                                         __func__, status);
 566                 goto unlink_int_urb;
 567         }
 568
 569         dbg("%s - sending TI_START_PORT", __func__);
 570         status = ti_command_out_sync(tdev, TI_START_PORT,
 571                 (__u8)(TI_UART1_PORT + port_number), 0, NULL, 0);
 572         if (status) {
 573                 dev_err(&port->dev, "%s - cannot send start command, %d\n",
 574                                                         __func__, status);
 575                 goto unlink_int_urb;
 576         }
 577
 578         dbg("%s - sending TI_PURGE_PORT", __func__);
 579         status = ti_command_out_sync(tdev, TI_PURGE_PORT,
 580                 (__u8)(TI_UART1_PORT + port_number), TI_PURGE_INPUT, NULL, 0);
 581         if (status) {
 582                 dev_err(&port->dev, "%s - cannot clear input buffers, %d\n",
 583                                                         __func__, status);
 584                 goto unlink_int_urb;
 585         }
 586         status = ti_command_out_sync(tdev, TI_PURGE_PORT,
 587                 (__u8)(TI_UART1_PORT + port_number), TI_PURGE_OUTPUT, NULL, 0);
 588         if (status) {
 589                 dev_err(&port->dev, "%s - cannot clear output buffers, %d\n",
 590                                                         __func__, status);
 591                 goto unlink_int_urb;
 592         }
 593
 594         /* reset the data toggle on the bulk endpoints to work around bug in
 595          * host controllers where things get out of sync some times */
 596         usb_clear_halt(dev, port->write_urb->pipe);
 597         usb_clear_halt(dev, port->read_urb->pipe);
 598
 599         if (tty)
 600                 ti_set_termios(tty, port, tty->termios);
 601
 602         dbg("%s - sending TI_OPEN_PORT (2)", __func__);
 603         status = ti_command_out_sync(tdev, TI_OPEN_PORT,
 604                 (__u8)(TI_UART1_PORT + port_number), open_settings, NULL, 0);
 605         if (status) {
 606                 dev_err(&port->dev, "%s - cannot send open command (2), %d\n",
 607                                                         __func__, status);
 608                 goto unlink_int_urb;
 609         }
 610
 611         dbg("%s - sending TI_START_PORT (2)", __func__);
 612         status = ti_command_out_sync(tdev, TI_START_PORT,
 613                 (__u8)(TI_UART1_PORT + port_number), 0, NULL, 0);
 614         if (status) {
 615                 dev_err(&port->dev, "%s - cannot send start command (2), %d\n",
 616                                                         __func__, status);
 617                 goto unlink_int_urb;
 618         }
 619
 620         /* start read urb */
 621         dbg("%s - start read urb", __func__);
 622         urb = port->read_urb;
 623         if (!urb) {
 624                 dev_err(&port->dev, "%s - no read urb\n", __func__);
 625                 status = -EINVAL;
 626                 goto unlink_int_urb;
 627         }
 628         tport->tp_read_urb_state = TI_READ_URB_RUNNING;
 629         urb->complete = ti_bulk_in_callback;
 630         urb->context = tport;
 631         urb->dev = dev;
 632         status = usb_submit_urb(urb, GFP_KERNEL);
 633         if (status) {
 634                 dev_err(&port->dev, "%s - submit read urb failed, %d\n",
 635                                                         __func__, status);
 636                 goto unlink_int_urb;
 637         }
 638
 639         tport->tp_is_open = 1;
 640         ++tdev->td_open_port_count;
 641
 642         goto release_lock;
 643
 644 unlink_int_urb:
 645         if (tdev->td_open_port_count == 0)
 646                 usb_kill_urb(port->serial->port[0]->interrupt_in_urb);
 647 release_lock:
 648         mutex_unlock(&tdev->td_open_close_lock);
 649         dbg("%s - exit %d", __func__, status);
 650         return status;
 651 }
 652
 653
 654 static void ti_close(struct tty_struct *tty, struct usb_serial_port *port,
 655                                                         struct file *file)
 656 {
 657         struct ti_device *tdev;
 658         struct ti_port *tport;
 659         int port_number;
 660         int status;
 661         int do_unlock;
 662
 663         dbg("%s - port %d", __func__, port->number);
 664
 665         tdev = usb_get_serial_data(port->serial);
 666         tport = usb_get_serial_port_data(port);
 667         if (tdev == NULL || tport == NULL)
 668                 return;
 669
 670         tport->tp_is_open = 0;
 671
 672         ti_drain(tport, (tport->tp_closing_wait*HZ)/100, 1);
 673
 674         usb_kill_urb(port->read_urb);
 675         usb_kill_urb(port->write_urb);
 676         tport->tp_write_urb_in_use = 0;
 677
 678         port_number = port->number - port->serial->minor;
 679
 680         dbg("%s - sending TI_CLOSE_PORT", __func__);
 681         status = ti_command_out_sync(tdev, TI_CLOSE_PORT,
 682                      (__u8)(TI_UART1_PORT + port_number), 0, NULL, 0);
 683         if (status)
 684                 dev_err(&port->dev,
 685                         "%s - cannot send close port command, %d\n"
 686                                                         , __func__, status);
 687
 688         /* if mutex_lock is interrupted, continue anyway */
 689         do_unlock = !mutex_lock_interruptible(&tdev->td_open_close_lock);
 690         --tport->tp_tdev->td_open_port_count;
 691         if (tport->tp_tdev->td_open_port_count <= 0) {
 692                 /* last port is closed, shut down interrupt urb */
 693                 usb_kill_urb(port->serial->port[0]->interrupt_in_urb);
 694                 tport->tp_tdev->td_open_port_count = 0;
 695         }
 696         if (do_unlock)
 697                 mutex_unlock(&tdev->td_open_close_lock);
 698
 699         dbg("%s - exit", __func__);
 700 }
 701
 702
 703 static int ti_write(struct tty_struct *tty, struct usb_serial_port *port,
 704                         const unsigned char *data, int count)
 705 {
 706         struct ti_port *tport = usb_get_serial_port_data(port);
 707         unsigned long flags;
 708
 709         dbg("%s - port %d", __func__, port->number);
 710
 711         if (count == 0) {
 712                 dbg("%s - write request of 0 bytes", __func__);
 713                 return 0;
 714         }
 715
 716         if (tport == NULL || !tport->tp_is_open)
 717                 return -ENODEV;
 718
 719         spin_lock_irqsave(&tport->tp_lock, flags);
 720         count = ti_buf_put(tport->tp_write_buf, data, count);
 721         spin_unlock_irqrestore(&tport->tp_lock, flags);
 722
 723         ti_send(tport);
 724
 725         return count;
 726 }
 727
 728
 729 static int ti_write_room(struct tty_struct *tty)
 730 {
 731         struct usb_serial_port *port = tty->driver_data;
 732         struct ti_port *tport = usb_get_serial_port_data(port);
 733         int room = 0;
 734         unsigned long flags;
 735
 736         dbg("%s - port %d", __func__, port->number);
 737
 738         if (tport == NULL)
 739                 return -ENODEV;
 740
 741         spin_lock_irqsave(&tport->tp_lock, flags);
 742         room = ti_buf_space_avail(tport->tp_write_buf);
 743         spin_unlock_irqrestore(&tport->tp_lock, flags);
 744
 745         dbg("%s - returns %d", __func__, room);
 746         return room;
 747 }
 748
 749
 750 static int ti_chars_in_buffer(struct tty_struct *tty)
 751 {
 752         struct usb_serial_port *port = tty->driver_data;
 753         struct ti_port *tport = usb_get_serial_port_data(port);
 754         int chars = 0;
 755         unsigned long flags;
 756
 757         dbg("%s - port %d", __func__, port->number);
 758
 759         if (tport == NULL)
 760                 return -ENODEV;
 761
 762         spin_lock_irqsave(&tport->tp_lock, flags);
 763         chars = ti_buf_data_avail(tport->tp_write_buf);
 764         spin_unlock_irqrestore(&tport->tp_lock, flags);
 765
 766         dbg("%s - returns %d", __func__, chars);
 767         return chars;
 768 }
 769
 770
 771 static void ti_throttle(struct tty_struct *tty)
 772 {
 773         struct usb_serial_port *port = tty->driver_data;
 774         struct ti_port *tport = usb_get_serial_port_data(port);
 775
 776         dbg("%s - port %d", __func__, port->number);
 777
 778         if (tport == NULL)
 779                 return;
 780
 781         if (I_IXOFF(tty) || C_CRTSCTS(tty))
 782                 ti_stop_read(tport, tty);
 783
 784 }
 785
 786
 787 static void ti_unthrottle(struct tty_struct *tty)
 788 {
 789         struct usb_serial_port *port = tty->driver_data;
 790         struct ti_port *tport = usb_get_serial_port_data(port);
 791         int status;
 792
 793         dbg("%s - port %d", __func__, port->number);
 794
 795         if (tport == NULL)
 796                 return;
 797
 798         if (I_IXOFF(tty) || C_CRTSCTS(tty)) {
 799                 status = ti_restart_read(tport, tty);
 800                 if (status)
 801                         dev_err(&port->dev, "%s - cannot restart read, %d\n",
 802                                                         __func__, status);
 803         }
 804 }
 805
 806
 807 static int ti_ioctl(struct tty_struct *tty, struct file *file,
 808         unsigned int cmd, unsigned long arg)
 809 {
 810         struct usb_serial_port *port = tty->driver_data;
 811         struct ti_port *tport = usb_get_serial_port_data(port);
 812         struct async_icount cnow;
 813         struct async_icount cprev;
 814
 815         dbg("%s - port %d, cmd = 0x%04X", __func__, port->number, cmd);
 816
 817         if (tport == NULL)
 818                 return -ENODEV;
 819
 820         switch (cmd) {
 821         case TIOCGSERIAL:
 822                 dbg("%s - (%d) TIOCGSERIAL", __func__, port->number);
 823                 return ti_get_serial_info(tport,
 824                                 (struct serial_struct __user *)arg);
 825         case TIOCSSERIAL:
 826                 dbg("%s - (%d) TIOCSSERIAL", __func__, port->number);
 827                 return ti_set_serial_info(tty, tport,
 828                                 (struct serial_struct __user *)arg);
 829         case TIOCMIWAIT:
 830                 dbg("%s - (%d) TIOCMIWAIT", __func__, port->number);
 831                 cprev = tport->tp_icount;
 832                 while (1) {
 833                         interruptible_sleep_on(&tport->tp_msr_wait);
 834                         if (signal_pending(current))
 835                                 return -ERESTARTSYS;
 836                         cnow = tport->tp_icount;
 837                         if (cnow.rng == cprev.rng && cnow.dsr == cprev.dsr &&
 838                             cnow.dcd == cprev.dcd && cnow.cts == cprev.cts)
 839                                 return -EIO; /* no change => error */
 840                         if (((arg & TIOCM_RNG) && (cnow.rng != cprev.rng)) ||
 841                             ((arg & TIOCM_DSR) && (cnow.dsr != cprev.dsr)) ||
 842                             ((arg & TIOCM_CD)  && (cnow.dcd != cprev.dcd)) ||
 843                             ((arg & TIOCM_CTS) && (cnow.cts != cprev.cts)))
 844                                 return 0;
 845                         cprev = cnow;
 846                 }
 847                 break;
 848         case TIOCGICOUNT:
 849                 dbg("%s - (%d) TIOCGICOUNT RX=%d, TX=%d",
 850                                 __func__, port->number,
 851                                 tport->tp_icount.rx, tport->tp_icount.tx);
 852                 if (copy_to_user((void __user *)arg, &tport->tp_icount,
 853                                         sizeof(tport->tp_icount)))
 854                         return -EFAULT;
 855                 return 0;
 856         }
 857         return -ENOIOCTLCMD;
 858 }
 859
 860
 861 static void ti_set_termios(struct tty_struct *tty,
 862                 struct usb_serial_port *port, struct ktermios *old_termios)
 863 {
 864         struct ti_port *tport = usb_get_serial_port_data(port);
 865         struct ti_uart_config *config;
 866         tcflag_t cflag, iflag;
 867         int baud;
 868         int status;
 869         int port_number = port->number - port->serial->minor;
 870         unsigned int mcr;
 871
 872         dbg("%s - port %d", __func__, port->number);
 873
 874         cflag = tty->termios->c_cflag;
 875         iflag = tty->termios->c_iflag;
 876
 877         dbg("%s - cflag %08x, iflag %08x", __func__, cflag, iflag);
 878         dbg("%s - old clfag %08x, old iflag %08x", __func__,
 879                                 old_termios->c_cflag, old_termios->c_iflag);
 880
 881         if (tport == NULL)
 882                 return;
 883
 884         config = kmalloc(sizeof(*config), GFP_KERNEL);
 885         if (!config) {
 886                 dev_err(&port->dev, "%s - out of memory\n", __func__);
 887                 return;
 888         }
 889
 890         config->wFlags = 0;
 891
 892         /* these flags must be set */
 893         config->wFlags |= TI_UART_ENABLE_MS_INTS;
 894         config->wFlags |= TI_UART_ENABLE_AUTO_START_DMA;
 895         config->bUartMode = (__u8)(tport->tp_uart_mode);
 896
 897         switch (cflag & CSIZE) {
 898         case CS5:
 899                     config->bDataBits = TI_UART_5_DATA_BITS;
 900                     break;
 901         case CS6:
 902                     config->bDataBits = TI_UART_6_DATA_BITS;
 903                     break;
 904         case CS7:
 905                     config->bDataBits = TI_UART_7_DATA_BITS;
 906                     break;
 907         default:
 908         case CS8:
 909                     config->bDataBits = TI_UART_8_DATA_BITS;
 910                     break;
 911         }
 912
 913         /* CMSPAR isn't supported by this driver */
 914         tty->termios->c_cflag &= ~CMSPAR;
 915
 916         if (cflag & PARENB) {
 917                 if (cflag & PARODD) {
 918                         config->wFlags |= TI_UART_ENABLE_PARITY_CHECKING;
 919                         config->bParity = TI_UART_ODD_PARITY;
 920                 } else {
 921                         config->wFlags |= TI_UART_ENABLE_PARITY_CHECKING;
 922                         config->bParity = TI_UART_EVEN_PARITY;
 923                 }
 924         } else {
 925                 config->wFlags &= ~TI_UART_ENABLE_PARITY_CHECKING;
 926                 config->bParity = TI_UART_NO_PARITY;
 927         }
 928
 929         if (cflag & CSTOPB)
 930                 config->bStopBits = TI_UART_2_STOP_BITS;
 931         else
 932                 config->bStopBits = TI_UART_1_STOP_BITS;
 933
 934         if (cflag & CRTSCTS) {
 935                 /* RTS flow control must be off to drop RTS for baud rate B0 */
 936                 if ((cflag & CBAUD) != B0)
 937                         config->wFlags |= TI_UART_ENABLE_RTS_IN;
 938                 config->wFlags |= TI_UART_ENABLE_CTS_OUT;
 939         } else {
 940                 tty->hw_stopped = 0;
 941                 ti_restart_read(tport, tty);
 942         }
 943
 944         if (I_IXOFF(tty) || I_IXON(tty)) {
 945                 config->cXon  = START_CHAR(tty);
 946                 config->cXoff = STOP_CHAR(tty);
 947
 948                 if (I_IXOFF(tty))
 949                         config->wFlags |= TI_UART_ENABLE_X_IN;
 950                 else
 951                         ti_restart_read(tport, tty);
 952
 953                 if (I_IXON(tty))
 954                         config->wFlags |= TI_UART_ENABLE_X_OUT;
 955         }
 956
 957         baud = tty_get_baud_rate(tty);
 958         if (!baud)
 959                 baud = 9600;
 960         if (tport->tp_tdev->td_is_3410)
 961                 config->wBaudRate = (__u16)((923077 + baud/2) / baud);
 962         else
 963                 config->wBaudRate = (__u16)((461538 + baud/2) / baud);
 964
 965         /* FIXME: Should calculate resulting baud here and report it back */
 966         if ((cflag & CBAUD) != B0)
 967                 tty_encode_baud_rate(tty, baud, baud);
 968
 969         dbg("%s - BaudRate=%d, wBaudRate=%d, wFlags=0x%04X, bDataBits=%d, bParity=%d, bStopBits=%d, cXon=%d, cXoff=%d, bUartMode=%d",
 970         __func__, baud, config->wBaudRate, config->wFlags, config->bDataBits, config->bParity, config->bStopBits, config->cXon, config->cXoff, config->bUartMode);
 971
 972         cpu_to_be16s(&config->wBaudRate);
 973         cpu_to_be16s(&config->wFlags);
 974
 975         status = ti_command_out_sync(tport->tp_tdev, TI_SET_CONFIG,
 976                 (__u8)(TI_UART1_PORT + port_number), 0, (__u8 *)config,
 977                 sizeof(*config));
 978         if (status)
 979                 dev_err(&port->dev, "%s - cannot set config on port %d, %d\n",
 980                                         __func__, port_number, status);
 981
 982         /* SET_CONFIG asserts RTS and DTR, reset them correctly */
 983         mcr = tport->tp_shadow_mcr;
 984         /* if baud rate is B0, clear RTS and DTR */
 985         if ((cflag & CBAUD) == B0)
 986                 mcr &= ~(TI_MCR_DTR | TI_MCR_RTS);
 987         status = ti_set_mcr(tport, mcr);
 988         if (status)
 989                 dev_err(&port->dev,
 990                         "%s - cannot set modem control on port %d, %d\n",
 991                                                 __func__, port_number, status);
 992
 993         kfree(config);
 994 }
 995
 996
 997 static int ti_tiocmget(struct tty_struct *tty, struct file *file)
 998 {
 999         struct usb_serial_port *port = tty->driver_data;
1000         struct ti_port *tport = usb_get_serial_port_data(port);
1001         unsigned int result;
1002         unsigned int msr;
1003         unsigned int mcr;
1004         unsigned long flags;
1005
1006         dbg("%s - port %d", __func__, port->number);
1007
1008         if (tport == NULL)
1009                 return -ENODEV;
1010
1011         spin_lock_irqsave(&tport->tp_lock, flags);
1012         msr = tport->tp_msr;
1013         mcr = tport->tp_shadow_mcr;
1014         spin_unlock_irqrestore(&tport->tp_lock, flags);
1015
1016         result = ((mcr & TI_MCR_DTR) ? TIOCM_DTR : 0)
1017                 | ((mcr & TI_MCR_RTS) ? TIOCM_RTS : 0)
1018                 | ((mcr & TI_MCR_LOOP) ? TIOCM_LOOP : 0)
1019                 | ((msr & TI_MSR_CTS) ? TIOCM_CTS : 0)
1020                 | ((msr & TI_MSR_CD) ? TIOCM_CAR : 0)
1021                 | ((msr & TI_MSR_RI) ? TIOCM_RI : 0)
1022                 | ((msr & TI_MSR_DSR) ? TIOCM_DSR : 0);
1023
1024         dbg("%s - 0x%04X", __func__, result);
1025
1026         return result;
1027 }
1028
1029
1030 static int ti_tiocmset(struct tty_struct *tty, struct file *file,
1031         unsigned int set, unsigned int clear)
1032 {
1033         struct usb_serial_port *port = tty->driver_data;
1034         struct ti_port *tport = usb_get_serial_port_data(port);
1035         unsigned int mcr;
1036         unsigned long flags;
1037
1038         dbg("%s - port %d", __func__, port->number);
1039
1040         if (tport == NULL)
1041                 return -ENODEV;
1042
1043         spin_lock_irqsave(&tport->tp_lock, flags);
1044         mcr = tport->tp_shadow_mcr;
1045
1046         if (set & TIOCM_RTS)
1047                 mcr |= TI_MCR_RTS;
1048         if (set & TIOCM_DTR)
1049                 mcr |= TI_MCR_DTR;
1050         if (set & TIOCM_LOOP)
1051                 mcr |= TI_MCR_LOOP;
1052
1053         if (clear & TIOCM_RTS)
1054                 mcr &= ~TI_MCR_RTS;
1055         if (clear & TIOCM_DTR)
1056                 mcr &= ~TI_MCR_DTR;
1057         if (clear & TIOCM_LOOP)
1058                 mcr &= ~TI_MCR_LOOP;
1059         spin_unlock_irqrestore(&tport->tp_lock, flags);
1060
1061         return ti_set_mcr(tport, mcr);
1062 }
1063
1064
1065 static void ti_break(struct tty_struct *tty, int break_state)
1066 {
1067         struct usb_serial_port *port = tty->driver_data;
1068         struct ti_port *tport = usb_get_serial_port_data(port);
1069         int status;
1070
1071         dbg("%s - state = %d", __func__, break_state);
1072
1073         if (tport == NULL)
1074                 return;
1075
1076         ti_drain(tport, (tport->tp_closing_wait*HZ)/100, 0);
1077
1078         status = ti_write_byte(tport->tp_tdev,
1079                 tport->tp_uart_base_addr + TI_UART_OFFSET_LCR,
1080                 TI_LCR_BREAK, break_state == -1 ? TI_LCR_BREAK : 0);
1081
1082         if (status)
1083                 dbg("%s - error setting break, %d", __func__, status);
1084 }
1085
1086
1087 static void ti_interrupt_callback(struct urb *urb)
1088 {
1089         struct ti_device *tdev = urb->context;
1090         struct usb_serial_port *port;
1091         struct usb_serial *serial = tdev->td_serial;
1092         struct ti_port *tport;
1093         struct device *dev = &urb->dev->dev;
1094         unsigned char *data = urb->transfer_buffer;
1095         int length = urb->actual_length;
1096         int port_number;
1097         int function;
1098         int status = urb->status;
1099         int retval;
1100         __u8 msr;
1101
1102         dbg("%s", __func__);
1103
1104         switch (status) {
1105         case 0:
1106                 break;
1107         case -ECONNRESET:
1108         case -ENOENT:
1109         case -ESHUTDOWN:
1110                 dbg("%s - urb shutting down, %d", __func__, status);
1111                 tdev->td_urb_error = 1;
1112                 return;
1113         default:
1114                 dev_err(dev, "%s - nonzero urb status, %d\n",
1115                         __func__, status);
1116                 tdev->td_urb_error = 1;
1117                 goto exit;
1118         }
1119
1120         if (length != 2) {
1121                 dbg("%s - bad packet size, %d", __func__, length);
1122                 goto exit;
1123         }
1124
1125         if (data[0] == TI_CODE_HARDWARE_ERROR) {
1126                 dev_err(dev, "%s - hardware error, %d\n", __func__, data[1]);
1127                 goto exit;
1128         }
1129
1130         port_number = TI_GET_PORT_FROM_CODE(data[0]);
1131         function = TI_GET_FUNC_FROM_CODE(data[0]);
1132
1133         dbg("%s - port_number %d, function %d, data 0x%02X",
1134                                 __func__, port_number, function, data[1]);
1135
1136         if (port_number >= serial->num_ports) {
1137                 dev_err(dev, "%s - bad port number, %d\n",
1138                                                 __func__, port_number);
1139                 goto exit;
1140         }
1141
1142         port = serial->port[port_number];
1143
1144         tport = usb_get_serial_port_data(port);
1145         if (!tport)
1146                 goto exit;
1147
1148         switch (function) {
1149         case TI_CODE_DATA_ERROR:
1150                 dev_err(dev, "%s - DATA ERROR, port %d, data 0x%02X\n",
1151                                         __func__, port_number, data[1]);
1152                 break;
1153
1154         case TI_CODE_MODEM_STATUS:
1155                 msr = data[1];
1156                 dbg("%s - port %d, msr 0x%02X", __func__, port_number, msr);
1157                 ti_handle_new_msr(tport, msr);
1158                 break;
1159
1160         default:
1161                 dev_err(dev, "%s - unknown interrupt code, 0x%02X\n",
1162                                                         __func__, data[1]);
1163                 break;
1164         }
1165
1166 exit:
1167         retval = usb_submit_urb(urb, GFP_ATOMIC);
1168         if (retval)
1169                 dev_err(dev, "%s - resubmit interrupt urb failed, %d\n",
1170                         __func__, retval);
1171 }
1172
1173
1174 static void ti_bulk_in_callback(struct urb *urb)
1175 {
1176         struct ti_port *tport = urb->context;
1177         struct usb_serial_port *port = tport->tp_port;
1178         struct device *dev = &urb->dev->dev;
1179         int status = urb->status;
1180         int retval = 0;
1181         struct tty_struct *tty;
1182
1183         dbg("%s", __func__);
1184
1185         switch (status) {
1186         case 0:
1187                 break;
1188         case -ECONNRESET:
1189         case -ENOENT:
1190         case -ESHUTDOWN:
1191                 dbg("%s - urb shutting down, %d", __func__, status);
1192                 tport->tp_tdev->td_urb_error = 1;
1193                 wake_up_interruptible(&tport->tp_write_wait);
1194                 return;
1195         default:
1196                 dev_err(dev, "%s - nonzero urb status, %d\n",
1197                         __func__, status);
1198                 tport->tp_tdev->td_urb_error = 1;
1199                 wake_up_interruptible(&tport->tp_write_wait);
1200         }
1201
1202         if (status == -EPIPE)
1203                 goto exit;
1204
1205         if (status) {
1206                 dev_err(dev, "%s - stopping read!\n", __func__);
1207                 return;
1208         }
1209
1210         tty = tty_port_tty_get(&port->port);
1211         if (tty && urb->actual_length) {
1212                 usb_serial_debug_data(debug, dev, __func__,
1213                         urb->actual_length, urb->transfer_buffer);
1214
1215                 if (!tport->tp_is_open)
1216                         dbg("%s - port closed, dropping data", __func__);
1217                 else
1218                         ti_recv(&urb->dev->dev, tty,
1219                                                 urb->transfer_buffer,
1220                                                 urb->actual_length);
1221
1222                 spin_lock(&tport->tp_lock);
1223                 tport->tp_icount.rx += urb->actual_length;
1224                 spin_unlock(&tport->tp_lock);
1225                 tty_kref_put(tty);
1226         }
1227
1228 exit:
1229         /* continue to read unless stopping */
1230         spin_lock(&tport->tp_lock);
1231         if (tport->tp_read_urb_state == TI_READ_URB_RUNNING) {
1232                 urb->dev = port->serial->dev;
1233                 retval = usb_submit_urb(urb, GFP_ATOMIC);
1234         } else if (tport->tp_read_urb_state == TI_READ_URB_STOPPING) {
1235                 tport->tp_read_urb_state = TI_READ_URB_STOPPED;
1236         }
1237         spin_unlock(&tport->tp_lock);
1238         if (retval)
1239                 dev_err(dev, "%s - resubmit read urb failed, %d\n",
1240                         __func__, retval);
1241 }
1242
1243
1244 static void ti_bulk_out_callback(struct urb *urb)
1245 {
1246         struct ti_port *tport = urb->context;
1247         struct usb_serial_port *port = tport->tp_port;
1248         struct device *dev = &urb->dev->dev;
1249         int status = urb->status;
1250
1251         dbg("%s - port %d", __func__, port->number);
1252
1253         tport->tp_write_urb_in_use = 0;
1254
1255         switch (status) {
1256         case 0:
1257                 break;
1258         case -ECONNRESET:
1259         case -ENOENT:
1260         case -ESHUTDOWN:
1261                 dbg("%s - urb shutting down, %d", __func__, status);
1262                 tport->tp_tdev->td_urb_error = 1;
1263                 wake_up_interruptible(&tport->tp_write_wait);
1264                 return;
1265         default:
1266                 dev_err(dev, "%s - nonzero urb status, %d\n",
1267                         __func__, status);
1268                 tport->tp_tdev->td_urb_error = 1;
1269                 wake_up_interruptible(&tport->tp_write_wait);
1270         }
1271
1272         /* send any buffered data */
1273         ti_send(tport);
1274 }
1275
1276
1277 static void ti_recv(struct device *dev, struct tty_struct *tty,
1278         unsigned char *data, int length)
1279 {
1280         int cnt;
1281
1282         do {
1283                 cnt = tty_buffer_request_room(tty, length);
1284                 if (cnt < length) {
1285                         dev_err(dev, "%s - dropping data, %d bytes lost\n",
1286                                                 __func__, length - cnt);
1287                         if (cnt == 0)
1288                                 break;
1289                 }
1290                 tty_insert_flip_string(tty, data, cnt);
1291                 tty_flip_buffer_push(tty);
1292                 data += cnt;
1293                 length -= cnt;
1294         } while (length > 0);
1295
1296 }
1297
1298
1299 static void ti_send(struct ti_port *tport)
1300 {
1301         int count, result;
1302         struct usb_serial_port *port = tport->tp_port;
1303         struct tty_struct *tty = tty_port_tty_get(&port->port); /* FIXME */
1304         unsigned long flags;
1305
1306
1307         dbg("%s - port %d", __func__, port->number);
1308
1309         spin_lock_irqsave(&tport->tp_lock, flags);
1310
1311         if (tport->tp_write_urb_in_use)
1312                 goto unlock;
1313
1314         count = ti_buf_get(tport->tp_write_buf,
1315                                 port->write_urb->transfer_buffer,
1316                                 port->bulk_out_size);
1317
1318         if (count == 0)
1319                 goto unlock;
1320
1321         tport->tp_write_urb_in_use = 1;
1322
1323         spin_unlock_irqrestore(&tport->tp_lock, flags);
1324
1325         usb_serial_debug_data(debug, &port->dev, __func__, count,
1326                                         port->write_urb->transfer_buffer);
1327
1328         usb_fill_bulk_urb(port->write_urb, port->serial->dev,
1329                            usb_sndbulkpipe(port->serial->dev,
1330                                             port->bulk_out_endpointAddress),
1331                            port->write_urb->transfer_buffer, count,
1332                            ti_bulk_out_callback, tport);
1333
1334         result = usb_submit_urb(port->write_urb, GFP_ATOMIC);
1335         if (result) {
1336                 dev_err(&port->dev, "%s - submit write urb failed, %d\n",
1337                                                         __func__, result);
1338                 tport->tp_write_urb_in_use = 0;
1339                 /* TODO: reschedule ti_send */
1340         } else {
1341                 spin_lock_irqsave(&tport->tp_lock, flags);
1342                 tport->tp_icount.tx += count;
1343                 spin_unlock_irqrestore(&tport->tp_lock, flags);
1344         }
1345
1346         /* more room in the buffer for new writes, wakeup */
1347         if (tty)
1348                 tty_wakeup(tty);
1349         tty_kref_put(tty);
1350         wake_up_interruptible(&tport->tp_write_wait);
1351         return;
1352 unlock:
1353         spin_unlock_irqrestore(&tport->tp_lock, flags);
1354         tty_kref_put(tty);
1355         return;
1356 }
1357
1358
1359 static int ti_set_mcr(struct ti_port *tport, unsigned int mcr)
1360 {
1361         unsigned long flags;
1362         int status;
1363
1364         status = ti_write_byte(tport->tp_tdev,
1365                 tport->tp_uart_base_addr + TI_UART_OFFSET_MCR,
1366                 TI_MCR_RTS | TI_MCR_DTR | TI_MCR_LOOP, mcr);
1367
1368         spin_lock_irqsave(&tport->tp_lock, flags);
1369         if (!status)
1370                 tport->tp_shadow_mcr = mcr;
1371         spin_unlock_irqrestore(&tport->tp_lock, flags);
1372
1373         return status;
1374 }
1375
1376
1377 static int ti_get_lsr(struct ti_port *tport)
1378 {
1379         int size, status;
1380         struct ti_device *tdev = tport->tp_tdev;
1381         struct usb_serial_port *port = tport->tp_port;
1382         int port_number = port->number - port->serial->minor;
1383         struct ti_port_status *data;
1384
1385         dbg("%s - port %d", __func__, port->number);
1386
1387         size = sizeof(struct ti_port_status);
1388         data = kmalloc(size, GFP_KERNEL);
1389         if (!data) {
1390                 dev_err(&port->dev, "%s - out of memory\n", __func__);
1391                 return -ENOMEM;
1392         }
1393
1394         status = ti_command_in_sync(tdev, TI_GET_PORT_STATUS,
1395                 (__u8)(TI_UART1_PORT+port_number), 0, (__u8 *)data, size);
1396         if (status) {
1397                 dev_err(&port->dev,
1398                         "%s - get port status command failed, %d\n",
1399                                                         __func__, status);
1400                 goto free_data;
1401         }
1402
1403         dbg("%s - lsr 0x%02X", __func__, data->bLSR);
1404
1405         tport->tp_lsr = data->bLSR;
1406
1407 free_data:
1408         kfree(data);
1409         return status;
1410 }
1411
1412
1413 static int ti_get_serial_info(struct ti_port *tport,
1414         struct serial_struct __user *ret_arg)
1415 {
1416         struct usb_serial_port *port = tport->tp_port;
1417         struct serial_struct ret_serial;
1418
1419         if (!ret_arg)
1420                 return -EFAULT;
1421
1422         memset(&ret_serial, 0, sizeof(ret_serial));
1423
1424         ret_serial.type = PORT_16550A;
1425         ret_serial.line = port->serial->minor;
1426         ret_serial.port = port->number - port->serial->minor;
1427         ret_serial.flags = tport->tp_flags;
1428         ret_serial.xmit_fifo_size = TI_WRITE_BUF_SIZE;
1429         ret_serial.baud_base = tport->tp_tdev->td_is_3410 ? 921600 : 460800;
1430         ret_serial.closing_wait = tport->tp_closing_wait;
1431
1432         if (copy_to_user(ret_arg, &ret_serial, sizeof(*ret_arg)))
1433                 return -EFAULT;
1434
1435         return 0;
1436 }
1437
1438
1439 static int ti_set_serial_info(struct tty_struct *tty, struct ti_port *tport,
1440         struct serial_struct __user *new_arg)
1441 {
1442         struct serial_struct new_serial;
1443
1444         if (copy_from_user(&new_serial, new_arg, sizeof(new_serial)))
1445                 return -EFAULT;
1446
1447         tport->tp_flags = new_serial.flags & TI_SET_SERIAL_FLAGS;
1448         tty->low_latency = (tport->tp_flags & ASYNC_LOW_LATENCY) ? 1 : 0;
1449         tport->tp_closing_wait = new_serial.closing_wait;
1450
1451         return 0;
1452 }
1453
1454
1455 static void ti_handle_new_msr(struct ti_port *tport, __u8 msr)
1456 {
1457         struct async_icount *icount;
1458         struct tty_struct *tty;
1459         unsigned long flags;
1460
1461         dbg("%s - msr 0x%02X", __func__, msr);
1462
1463         if (msr & TI_MSR_DELTA_MASK) {
1464                 spin_lock_irqsave(&tport->tp_lock, flags);
1465                 icount = &tport->tp_icount;
1466                 if (msr & TI_MSR_DELTA_CTS)
1467                         icount->cts++;
1468                 if (msr & TI_MSR_DELTA_DSR)
1469                         icount->dsr++;
1470                 if (msr & TI_MSR_DELTA_CD)
1471                         icount->dcd++;
1472                 if (msr & TI_MSR_DELTA_RI)
1473                         icount->rng++;
1474                 wake_up_interruptible(&tport->tp_msr_wait);
1475                 spin_unlock_irqrestore(&tport->tp_lock, flags);
1476         }
1477
1478         tport->tp_msr = msr & TI_MSR_MASK;
1479
1480         /* handle CTS flow control */
1481         tty = tty_port_tty_get(&tport->tp_port->port);
1482         if (tty && C_CRTSCTS(tty)) {
1483                 if (msr & TI_MSR_CTS) {
1484                         tty->hw_stopped = 0;
1485                         tty_wakeup(tty);
1486                 } else {
1487                         tty->hw_stopped = 1;
1488                 }
1489         }
1490         tty_kref_put(tty);
1491 }
1492
1493
1494 static void ti_drain(struct ti_port *tport, unsigned long timeout, int flush)
1495 {
1496         struct ti_device *tdev = tport->tp_tdev;
1497         struct usb_serial_port *port = tport->tp_port;
1498         wait_queue_t wait;
1499
1500         dbg("%s - port %d", __func__, port->number);
1501
1502         spin_lock_irq(&tport->tp_lock);
1503
1504         /* wait for data to drain from the buffer */
1505         tdev->td_urb_error = 0;
1506         init_waitqueue_entry(&wait, current);
1507         add_wait_queue(&tport->tp_write_wait, &wait);
1508         for (;;) {
1509                 set_current_state(TASK_INTERRUPTIBLE);
1510                 if (ti_buf_data_avail(tport->tp_write_buf) == 0
1511                 || timeout == 0 || signal_pending(current)
1512                 || tdev->td_urb_error
1513                 || port->serial->disconnected)  /* disconnect */
1514                         break;
1515                 spin_unlock_irq(&tport->tp_lock);
1516                 timeout = schedule_timeout(timeout);
1517                 spin_lock_irq(&tport->tp_lock);
1518         }
1519         set_current_state(TASK_RUNNING);
1520         remove_wait_queue(&tport->tp_write_wait, &wait);
1521
1522         /* flush any remaining data in the buffer */
1523         if (flush)
1524                 ti_buf_clear(tport->tp_write_buf);
1525
1526         spin_unlock_irq(&tport->tp_lock);
1527
1528         mutex_lock(&port->serial->disc_mutex);
1529         /* wait for data to drain from the device */
1530         /* wait for empty tx register, plus 20 ms */
1531         timeout += jiffies;
1532         tport->tp_lsr &= ~TI_LSR_TX_EMPTY;
1533         while ((long)(jiffies - timeout) < 0 && !signal_pending(current)
1534         && !(tport->tp_lsr&TI_LSR_TX_EMPTY) && !tdev->td_urb_error
1535         && !port->serial->disconnected) {
1536                 if (ti_get_lsr(tport))
1537                         break;
1538                 mutex_unlock(&port->serial->disc_mutex);
1539                 msleep_interruptible(20);
1540                 mutex_lock(&port->serial->disc_mutex);
1541         }
1542         mutex_unlock(&port->serial->disc_mutex);
1543 }
1544
1545
1546 static void ti_stop_read(struct ti_port *tport, struct tty_struct *tty)
1547 {
1548         unsigned long flags;
1549
1550         spin_lock_irqsave(&tport->tp_lock, flags);
1551
1552         if (tport->tp_read_urb_state == TI_READ_URB_RUNNING)
1553                 tport->tp_read_urb_state = TI_READ_URB_STOPPING;
1554
1555         spin_unlock_irqrestore(&tport->tp_lock, flags);
1556 }
1557
1558
1559 static int ti_restart_read(struct ti_port *tport, struct tty_struct *tty)
1560 {
1561         struct urb *urb;
1562         int status = 0;
1563         unsigned long flags;
1564
1565         spin_lock_irqsave(&tport->tp_lock, flags);
1566
1567         if (tport->tp_read_urb_state == TI_READ_URB_STOPPED) {
1568                 tport->tp_read_urb_state = TI_READ_URB_RUNNING;
1569                 urb = tport->tp_port->read_urb;
1570                 spin_unlock_irqrestore(&tport->tp_lock, flags);
1571                 urb->complete = ti_bulk_in_callback;
1572                 urb->context = tport;
1573                 urb->dev = tport->tp_port->serial->dev;
1574                 status = usb_submit_urb(urb, GFP_KERNEL);
1575         } else  {
1576                 tport->tp_read_urb_state = TI_READ_URB_RUNNING;
1577                 spin_unlock_irqrestore(&tport->tp_lock, flags);
1578         }
1579
1580         return status;
1581 }
1582
1583
1584 static int ti_command_out_sync(struct ti_device *tdev, __u8 command,
1585         __u16 moduleid, __u16 value, __u8 *data, int size)
1586 {
1587         int status;
1588
1589         status = usb_control_msg(tdev->td_serial->dev,
1590                 usb_sndctrlpipe(tdev->td_serial->dev, 0), command,
1591                 (USB_TYPE_VENDOR | USB_RECIP_DEVICE | USB_DIR_OUT),
1592                 value, moduleid, data, size, 1000);
1593
1594         if (status == size)
1595                 status = 0;
1596
1597         if (status > 0)
1598                 status = -ECOMM;
1599
1600         return status;
1601 }
1602
1603
1604 static int ti_command_in_sync(struct ti_device *tdev, __u8 command,
1605         __u16 moduleid, __u16 value, __u8 *data, int size)
1606 {
1607         int status;
1608
1609         status = usb_control_msg(tdev->td_serial->dev,
1610                 usb_rcvctrlpipe(tdev->td_serial->dev, 0), command,
1611                 (USB_TYPE_VENDOR | USB_RECIP_DEVICE | USB_DIR_IN),
1612                 value, moduleid, data, size, 1000);
1613
1614         if (status == size)
1615                 status = 0;
1616
1617         if (status > 0)
1618                 status = -ECOMM;
1619
1620         return status;
1621 }
1622
1623
1624 static int ti_write_byte(struct ti_device *tdev, unsigned long addr,
1625         __u8 mask, __u8 byte)
1626 {
1627         int status;
1628         unsigned int size;
1629         struct ti_write_data_bytes *data;
1630         struct device *dev = &tdev->td_serial->dev->dev;
1631
1632         dbg("%s - addr 0x%08lX, mask 0x%02X, byte 0x%02X",
1633                                         __func__, addr, mask, byte);
1634
1635         size = sizeof(struct ti_write_data_bytes) + 2;
1636         data = kmalloc(size, GFP_KERNEL);
1637         if (!data) {
1638                 dev_err(dev, "%s - out of memory\n", __func__);
1639                 return -ENOMEM;
1640         }
1641
1642         data->bAddrType = TI_RW_DATA_ADDR_XDATA;
1643         data->bDataType = TI_RW_DATA_BYTE;
1644         data->bDataCounter = 1;
1645         data->wBaseAddrHi = cpu_to_be16(addr>>16);
1646         data->wBaseAddrLo = cpu_to_be16(addr);
1647         data->bData[0] = mask;
1648         data->bData[1] = byte;
1649
1650         status = ti_command_out_sync(tdev, TI_WRITE_DATA, TI_RAM_PORT, 0,
1651                 (__u8 *)data, size);
1652
1653         if (status < 0)
1654                 dev_err(dev, "%s - failed, %d\n", __func__, status);
1655
1656         kfree(data);
1657
1658         return status;
1659 }
1660
1661 static int ti_do_download(struct usb_device *dev, int pipe,
1662                                                 u8 *buffer, int size)
1663 {
1664         int pos;
1665         u8 cs = 0;
1666         int done;
1667         struct ti_firmware_header *header;
1668         int status;
1669         int len;
1670
1671         for (pos = sizeof(struct ti_firmware_header); pos < size; pos++)
1672                 cs = (__u8)(cs + buffer[pos]);
1673
1674         header = (struct ti_firmware_header *)buffer;
1675         header->wLength = cpu_to_le16((__u16)(size
1676                                         - sizeof(struct ti_firmware_header)));
1677         header->bCheckSum = cs;
1678
1679         dbg("%s - downloading firmware", __func__);
1680         for (pos = 0; pos < size; pos += done) {
1681                 len = min(size - pos, TI_DOWNLOAD_MAX_PACKET_SIZE);
1682                 status = usb_bulk_msg(dev, pipe, buffer + pos, len,
1683                                                                 &done, 1000);
1684                 if (status)
1685                         break;
1686         }
1687         return status;
1688 }
1689
1690 static int ti_download_firmware(struct ti_device *tdev)
1691 {
1692         int status;
1693         int buffer_size;
1694         __u8 *buffer;
1695         struct usb_device *dev = tdev->td_serial->dev;
1696         unsigned int pipe = usb_sndbulkpipe(dev,
1697                 tdev->td_serial->port[0]->bulk_out_endpointAddress);
1698         const struct firmware *fw_p;
1699         char buf[32];
1700
1701         /* try ID specific firmware first, then try generic firmware */
1702         sprintf(buf, "ti_usb-v%04x-p%04x.fw", dev->descriptor.idVendor,
1703             dev->descriptor.idProduct);
1704         if ((status = request_firmware(&fw_p, buf, &dev->dev)) != 0) {
1705                 buf[0] = '\0';
1706                 if (dev->descriptor.idVendor == MTS_VENDOR_ID) {
1707                         switch (dev->descriptor.idProduct) {
1708                         case MTS_CDMA_PRODUCT_ID:
1709                                 strcpy(buf, "mts_cdma.fw");
1710                                 break;
1711                         case MTS_GSM_PRODUCT_ID:
1712                                 strcpy(buf, "mts_gsm.fw");
1713                                 break;
1714                         case MTS_EDGE_PRODUCT_ID:
1715                                 strcpy(buf, "mts_edge.fw");
1716                                 break;
1717                         }
1718                 }
1719                 if (buf[0] == '\0') {
1720                         if (tdev->td_is_3410)
1721                                 strcpy(buf, "ti_3410.fw");
1722                         else
1723                                 strcpy(buf, "ti_5052.fw");
1724                 }
1725                 status = request_firmware(&fw_p, buf, &dev->dev);
1726         }
1727         if (status) {
1728                 dev_err(&dev->dev, "%s - firmware not found\n", __func__);
1729                 return -ENOENT;
1730         }
1731         if (fw_p->size > TI_FIRMWARE_BUF_SIZE) {
1732                 dev_err(&dev->dev, "%s - firmware too large\n", __func__);
1733                 return -ENOENT;
1734         }
1735
1736         buffer_size = TI_FIRMWARE_BUF_SIZE + sizeof(struct ti_firmware_header);
1737         buffer = kmalloc(buffer_size, GFP_KERNEL);
1738         if (buffer) {
1739                 memcpy(buffer, fw_p->data, fw_p->size);
1740                 memset(buffer + fw_p->size, 0xff, buffer_size - fw_p->size);
1741                 status = ti_do_download(dev, pipe, buffer, fw_p->size);
1742                 kfree(buffer);
1743         } else {
1744                 status = -ENOMEM;
1745         }
1746         release_firmware(fw_p);
1747         if (status) {
1748                 dev_err(&dev->dev, "%s - error downloading firmware, %d\n",
1749                                                         __func__, status);
1750                 return status;
1751         }
1752
1753         dbg("%s - download successful", __func__);
1754
1755         return 0;
1756 }
1757
1758
1759 /* Circular Buffer Functions */
1760
1761 /*
1762  * ti_buf_alloc
1763  *
1764  * Allocate a circular buffer and all associated memory.
1765  */
1766
1767 static struct circ_buf *ti_buf_alloc(void)
1768 {
1769         struct circ_buf *cb;
1770
1771         cb = kmalloc(sizeof(struct circ_buf), GFP_KERNEL);
1772         if (cb == NULL)
1773                 return NULL;
1774
1775         cb->buf = kmalloc(TI_WRITE_BUF_SIZE, GFP_KERNEL);
1776         if (cb->buf == NULL) {
1777                 kfree(cb);
1778                 return NULL;
1779         }
1780
1781         ti_buf_clear(cb);
1782
1783         return cb;
1784 }
1785
1786
1787 /*
1788  * ti_buf_free
1789  *
1790  * Free the buffer and all associated memory.
1791  */
1792
1793 static void ti_buf_free(struct circ_buf *cb)
1794 {
1795         kfree(cb->buf);
1796         kfree(cb);
1797 }
1798
1799
1800 /*
1801  * ti_buf_clear
1802  *
1803  * Clear out all data in the circular buffer.
1804  */
1805
1806 static void ti_buf_clear(struct circ_buf *cb)
1807 {
1808         cb->head = cb->tail = 0;
1809 }
1810
1811
1812 /*
1813  * ti_buf_data_avail
1814  *
1815  * Return the number of bytes of data available in the circular
1816  * buffer.
1817  */
1818
1819 static int ti_buf_data_avail(struct circ_buf *cb)
1820 {
1821         return CIRC_CNT(cb->head, cb->tail, TI_WRITE_BUF_SIZE);
1822 }
1823
1824
1825 /*
1826  * ti_buf_space_avail
1827  *
1828  * Return the number of bytes of space available in the circular
1829  * buffer.
1830  */
1831
1832 static int ti_buf_space_avail(struct circ_buf *cb)
1833 {
1834         return CIRC_SPACE(cb->head, cb->tail, TI_WRITE_BUF_SIZE);
1835 }
1836
1837
1838 /*
1839  * ti_buf_put
1840  *
1841  * Copy data data from a user buffer and put it into the circular buffer.
1842  * Restrict to the amount of space available.
1843  *
1844  * Return the number of bytes copied.
1845  */
1846
1847 static int ti_buf_put(struct circ_buf *cb, const char *buf, int count)
1848 {
1849         int c, ret = 0;
1850
1851         while (1) {
1852                 c = CIRC_SPACE_TO_END(cb->head, cb->tail, TI_WRITE_BUF_SIZE);
1853                 if (count < c)
1854                         c = count;
1855                 if (c <= 0)
1856                         break;
1857                 memcpy(cb->buf + cb->head, buf, c);
1858                 cb->head = (cb->head + c) & (TI_WRITE_BUF_SIZE-1);
1859                 buf += c;
1860                 count -= c;
1861                 ret += c;
1862         }
1863
1864         return ret;
1865 }
1866
1867
1868 /*
1869  * ti_buf_get
1870  *
1871  * Get data from the circular buffer and copy to the given buffer.
1872  * Restrict to the amount of data available.
1873  *
1874  * Return the number of bytes copied.
1875  */
1876
1877 static int ti_buf_get(struct circ_buf *cb, char *buf, int count)
1878 {
1879         int c, ret = 0;
1880
1881         while (1) {
1882                 c = CIRC_CNT_TO_END(cb->head, cb->tail, TI_WRITE_BUF_SIZE);
1883                 if (count < c)
1884                         c = count;
1885                 if (c <= 0)
1886                         break;
1887                 memcpy(buf, cb->buf + cb->tail, c);
1888                 cb->tail = (cb->tail + c) & (TI_WRITE_BUF_SIZE-1);
1889                 buf += c;
1890                 count -= c;
1891                 ret += c;
1892         }
1893
1894         return ret;
1895 }