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