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 static void ti_close(struct usb_serial_port *port);
 103 static int ti_write(struct tty_struct *tty, struct usb_serial_port *port,
 104                 const unsigned char *data, int count);
 105 static int ti_write_room(struct tty_struct *tty);
 106 static int ti_chars_in_buffer(struct tty_struct *tty);
 107 static void ti_throttle(struct tty_struct *tty);
 108 static void ti_unthrottle(struct tty_struct *tty);
 109 static int ti_ioctl(struct tty_struct *tty, struct file *file,
 110                 unsigned int cmd, unsigned long arg);
 111 static void ti_set_termios(struct tty_struct *tty,
 112                 struct usb_serial_port *port, struct ktermios *old_termios);
 113 static int ti_tiocmget(struct tty_struct *tty, struct file *file);
 114 static int ti_tiocmset(struct tty_struct *tty, struct file *file,
 115                 unsigned int set, unsigned int clear);
 116 static void ti_break(struct tty_struct *tty, int break_state);
 117 static void ti_interrupt_callback(struct urb *urb);
 118 static void ti_bulk_in_callback(struct urb *urb);
 119 static void ti_bulk_out_callback(struct urb *urb);
 120
 121 static void ti_recv(struct device *dev, struct tty_struct *tty,
 122         unsigned char *data, int length);
 123 static void ti_send(struct ti_port *tport);
 124 static int ti_set_mcr(struct ti_port *tport, unsigned int mcr);
 125 static int ti_get_lsr(struct ti_port *tport);
 126 static int ti_get_serial_info(struct ti_port *tport,
 127         struct serial_struct __user *ret_arg);
 128 static int ti_set_serial_info(struct tty_struct *tty, struct ti_port *tport,
 129         struct serial_struct __user *new_arg);
 130 static void ti_handle_new_msr(struct ti_port *tport, __u8 msr);
 131
 132 static void ti_drain(struct ti_port *tport, unsigned long timeout, int flush);
 133
 134 static void ti_stop_read(struct ti_port *tport, struct tty_struct *tty);
 135 static int ti_restart_read(struct ti_port *tport, struct tty_struct *tty);
 136
 137 static int ti_command_out_sync(struct ti_device *tdev, __u8 command,
 138         __u16 moduleid, __u16 value, __u8 *data, int size);
 139 static int ti_command_in_sync(struct ti_device *tdev, __u8 command,
 140         __u16 moduleid, __u16 value, __u8 *data, int size);
 141
 142 static int ti_write_byte(struct ti_device *tdev, unsigned long addr,
 143         __u8 mask, __u8 byte);
 144
 145 static int ti_download_firmware(struct ti_device *tdev);
 146
 147 /* circular buffer */
 148 static struct circ_buf *ti_buf_alloc(void);
 149 static void ti_buf_free(struct circ_buf *cb);
 150 static void ti_buf_clear(struct circ_buf *cb);
 151 static int ti_buf_data_avail(struct circ_buf *cb);
 152 static int ti_buf_space_avail(struct circ_buf *cb);
 153 static int ti_buf_put(struct circ_buf *cb, const char *buf, int count);
 154 static int ti_buf_get(struct circ_buf *cb, char *buf, int count);
 155
 156
 157 /* Data */
 158
 159 /* module parameters */
 160 static int debug;
 161 static int closing_wait = TI_DEFAULT_CLOSING_WAIT;
 162 static ushort vendor_3410[TI_EXTRA_VID_PID_COUNT];
 163 static unsigned int vendor_3410_count;
 164 static ushort product_3410[TI_EXTRA_VID_PID_COUNT];
 165 static unsigned int product_3410_count;
 166 static ushort vendor_5052[TI_EXTRA_VID_PID_COUNT];
 167 static unsigned int vendor_5052_count;
 168 static ushort product_5052[TI_EXTRA_VID_PID_COUNT];
 169 static unsigned int product_5052_count;
 170
 171 /* supported devices */
 172 /* the array dimension is the number of default entries plus */
 173 /* TI_EXTRA_VID_PID_COUNT user defined entries plus 1 terminating */
 174 /* null entry */
 175 static struct usb_device_id ti_id_table_3410[10+TI_EXTRA_VID_PID_COUNT+1] = {
 176         { USB_DEVICE(TI_VENDOR_ID, TI_3410_PRODUCT_ID) },
 177         { USB_DEVICE(TI_VENDOR_ID, TI_3410_EZ430_ID) },
 178         { USB_DEVICE(MTS_VENDOR_ID, MTS_GSM_NO_FW_PRODUCT_ID) },
 179         { USB_DEVICE(MTS_VENDOR_ID, MTS_CDMA_NO_FW_PRODUCT_ID) },
 180         { USB_DEVICE(MTS_VENDOR_ID, MTS_CDMA_PRODUCT_ID) },
 181         { USB_DEVICE(MTS_VENDOR_ID, MTS_GSM_PRODUCT_ID) },
 182         { USB_DEVICE(MTS_VENDOR_ID, MTS_EDGE_PRODUCT_ID) },
 183         { USB_DEVICE(IBM_VENDOR_ID, IBM_4543_PRODUCT_ID) },
 184         { USB_DEVICE(IBM_VENDOR_ID, IBM_454B_PRODUCT_ID) },
 185         { USB_DEVICE(IBM_VENDOR_ID, IBM_454C_PRODUCT_ID) },
 186 };
 187
 188 static struct usb_device_id ti_id_table_5052[5+TI_EXTRA_VID_PID_COUNT+1] = {
 189         { USB_DEVICE(TI_VENDOR_ID, TI_5052_BOOT_PRODUCT_ID) },
 190         { USB_DEVICE(TI_VENDOR_ID, TI_5152_BOOT_PRODUCT_ID) },
 191         { USB_DEVICE(TI_VENDOR_ID, TI_5052_EEPROM_PRODUCT_ID) },
 192         { USB_DEVICE(TI_VENDOR_ID, TI_5052_FIRMWARE_PRODUCT_ID) },
 193 };
 194
 195 static struct usb_device_id ti_id_table_combined[14+2*TI_EXTRA_VID_PID_COUNT+1] = {
 196         { USB_DEVICE(TI_VENDOR_ID, TI_3410_PRODUCT_ID) },
 197         { USB_DEVICE(TI_VENDOR_ID, TI_3410_EZ430_ID) },
 198         { USB_DEVICE(MTS_VENDOR_ID, MTS_GSM_NO_FW_PRODUCT_ID) },
 199         { USB_DEVICE(MTS_VENDOR_ID, MTS_CDMA_NO_FW_PRODUCT_ID) },
 200         { USB_DEVICE(MTS_VENDOR_ID, MTS_CDMA_PRODUCT_ID) },
 201         { USB_DEVICE(MTS_VENDOR_ID, MTS_GSM_PRODUCT_ID) },
 202         { USB_DEVICE(MTS_VENDOR_ID, MTS_EDGE_PRODUCT_ID) },
 203         { USB_DEVICE(TI_VENDOR_ID, TI_5052_BOOT_PRODUCT_ID) },
 204         { USB_DEVICE(TI_VENDOR_ID, TI_5152_BOOT_PRODUCT_ID) },
 205         { USB_DEVICE(TI_VENDOR_ID, TI_5052_EEPROM_PRODUCT_ID) },
 206         { USB_DEVICE(TI_VENDOR_ID, TI_5052_FIRMWARE_PRODUCT_ID) },
 207         { USB_DEVICE(IBM_VENDOR_ID, IBM_4543_PRODUCT_ID) },
 208         { USB_DEVICE(IBM_VENDOR_ID, IBM_454B_PRODUCT_ID) },
 209         { USB_DEVICE(IBM_VENDOR_ID, IBM_454C_PRODUCT_ID) },
 210         { }
 211 };
 212
 213 static struct usb_driver ti_usb_driver = {
 214         .name                   = "ti_usb_3410_5052",
 215         .probe                  = usb_serial_probe,
 216         .disconnect             = usb_serial_disconnect,
 217         .id_table               = ti_id_table_combined,
 218         .no_dynamic_id =        1,
 219 };
 220
 221 static struct usb_serial_driver ti_1port_device = {
 222         .driver = {
 223                 .owner          = THIS_MODULE,
 224                 .name           = "ti_usb_3410_5052_1",
 225         },
 226         .description            = "TI USB 3410 1 port adapter",
 227         .usb_driver             = &ti_usb_driver,
 228         .id_table               = ti_id_table_3410,
 229         .num_ports              = 1,
 230         .attach                 = ti_startup,
 231         .release                = ti_release,
 232         .open                   = ti_open,
 233         .close                  = ti_close,
 234         .write                  = ti_write,
 235         .write_room             = ti_write_room,
 236         .chars_in_buffer        = ti_chars_in_buffer,
 237         .throttle               = ti_throttle,
 238         .unthrottle             = ti_unthrottle,
 239         .ioctl                  = ti_ioctl,
 240         .set_termios            = ti_set_termios,
 241         .tiocmget               = ti_tiocmget,
 242         .tiocmset               = ti_tiocmset,
 243         .break_ctl              = ti_break,
 244         .read_int_callback      = ti_interrupt_callback,
 245         .read_bulk_callback     = ti_bulk_in_callback,
 246         .write_bulk_callback    = ti_bulk_out_callback,
 247 };
 248
 249 static struct usb_serial_driver ti_2port_device = {
 250         .driver = {
 251                 .owner          = THIS_MODULE,
 252                 .name           = "ti_usb_3410_5052_2",
 253         },
 254         .description            = "TI USB 5052 2 port adapter",
 255         .usb_driver             = &ti_usb_driver,
 256         .id_table               = ti_id_table_5052,
 257         .num_ports              = 2,
 258         .attach                 = ti_startup,
 259         .release                = ti_release,
 260         .open                   = ti_open,
 261         .close                  = ti_close,
 262         .write                  = ti_write,
 263         .write_room             = ti_write_room,
 264         .chars_in_buffer        = ti_chars_in_buffer,
 265         .throttle               = ti_throttle,
 266         .unthrottle             = ti_unthrottle,
 267         .ioctl                  = ti_ioctl,
 268         .set_termios            = ti_set_termios,
 269         .tiocmget               = ti_tiocmget,
 270         .tiocmset               = ti_tiocmset,
 271         .break_ctl              = ti_break,
 272         .read_int_callback      = ti_interrupt_callback,
 273         .read_bulk_callback     = ti_bulk_in_callback,
 274         .write_bulk_callback    = ti_bulk_out_callback,
 275 };
 276
 277
 278 /* Module */
 279
 280 MODULE_AUTHOR(TI_DRIVER_AUTHOR);
 281 MODULE_DESCRIPTION(TI_DRIVER_DESC);
 282 MODULE_VERSION(TI_DRIVER_VERSION);
 283 MODULE_LICENSE("GPL");
 284
 285 MODULE_FIRMWARE("ti_3410.fw");
 286 MODULE_FIRMWARE("ti_5052.fw");
 287 MODULE_FIRMWARE("mts_cdma.fw");
 288 MODULE_FIRMWARE("mts_gsm.fw");
 289 MODULE_FIRMWARE("mts_edge.fw");
 290
 291 module_param(debug, bool, S_IRUGO | S_IWUSR);
 292 MODULE_PARM_DESC(debug, "Enable debugging, 0=no, 1=yes");
 293
 294 module_param(closing_wait, int, S_IRUGO | S_IWUSR);
 295 MODULE_PARM_DESC(closing_wait,
 296     "Maximum wait for data to drain in close, in .01 secs, default is 4000");
 297
 298 module_param_array(vendor_3410, ushort, &vendor_3410_count, S_IRUGO);
 299 MODULE_PARM_DESC(vendor_3410,
 300                 "Vendor ids for 3410 based devices, 1-5 short integers");
 301 module_param_array(product_3410, ushort, &product_3410_count, S_IRUGO);
 302 MODULE_PARM_DESC(product_3410,
 303                 "Product ids for 3410 based devices, 1-5 short integers");
 304 module_param_array(vendor_5052, ushort, &vendor_5052_count, S_IRUGO);
 305 MODULE_PARM_DESC(vendor_5052,
 306                 "Vendor ids for 5052 based devices, 1-5 short integers");
 307 module_param_array(product_5052, ushort, &product_5052_count, S_IRUGO);
 308 MODULE_PARM_DESC(product_5052,
 309                 "Product ids for 5052 based devices, 1-5 short integers");
 310
 311 MODULE_DEVICE_TABLE(usb, ti_id_table_combined);
 312
 313
 314 /* Functions */
 315
 316 static int __init ti_init(void)
 317 {
 318         int i, j, c;
 319         int ret;
 320
 321         /* insert extra vendor and product ids */
 322         c = ARRAY_SIZE(ti_id_table_combined) - 2 * TI_EXTRA_VID_PID_COUNT - 1;
 323         j = ARRAY_SIZE(ti_id_table_3410) - TI_EXTRA_VID_PID_COUNT - 1;
 324         for (i = 0; i < min(vendor_3410_count, product_3410_count); i++, j++, c++) {
 325                 ti_id_table_3410[j].idVendor = vendor_3410[i];
 326                 ti_id_table_3410[j].idProduct = product_3410[i];
 327                 ti_id_table_3410[j].match_flags = USB_DEVICE_ID_MATCH_DEVICE;
 328                 ti_id_table_combined[c].idVendor = vendor_3410[i];
 329                 ti_id_table_combined[c].idProduct = product_3410[i];
 330                 ti_id_table_combined[c].match_flags = USB_DEVICE_ID_MATCH_DEVICE;
 331         }
 332         j = ARRAY_SIZE(ti_id_table_5052) - TI_EXTRA_VID_PID_COUNT - 1;
 333         for (i = 0; i < min(vendor_5052_count, product_5052_count); i++, j++, c++) {
 334                 ti_id_table_5052[j].idVendor = vendor_5052[i];
 335                 ti_id_table_5052[j].idProduct = product_5052[i];
 336                 ti_id_table_5052[j].match_flags = USB_DEVICE_ID_MATCH_DEVICE;
 337                 ti_id_table_combined[c].idVendor = vendor_5052[i];
 338                 ti_id_table_combined[c].idProduct = product_5052[i];
 339                 ti_id_table_combined[c].match_flags = USB_DEVICE_ID_MATCH_DEVICE;
 340         }
 341
 342         ret = usb_serial_register(&ti_1port_device);
 343         if (ret)
 344                 goto failed_1port;
 345         ret = usb_serial_register(&ti_2port_device);
 346         if (ret)
 347                 goto failed_2port;
 348
 349         ret = usb_register(&ti_usb_driver);
 350         if (ret)
 351                 goto failed_usb;
 352
 353         printk(KERN_INFO KBUILD_MODNAME ": " TI_DRIVER_VERSION ":"
 354                TI_DRIVER_DESC "\n");
 355
 356         return 0;
 357
 358 failed_usb:
 359         usb_serial_deregister(&ti_2port_device);
 360 failed_2port:
 361         usb_serial_deregister(&ti_1port_device);
 362 failed_1port:
 363         return ret;
 364 }
 365
 366
 367 static void __exit ti_exit(void)
 368 {
 369         usb_serial_deregister(&ti_1port_device);
 370         usb_serial_deregister(&ti_2port_device);
 371         usb_deregister(&ti_usb_driver);
 372 }
 373
 374
 375 module_init(ti_init);
 376 module_exit(ti_exit);
 377
 378
 379 static int ti_startup(struct usb_serial *serial)
 380 {
 381         struct ti_device *tdev;
 382         struct ti_port *tport;
 383         struct usb_device *dev = serial->dev;
 384         int status;
 385         int i;
 386
 387
 388         dbg("%s - product 0x%4X, num configurations %d, configuration value %d",
 389             __func__, le16_to_cpu(dev->descriptor.idProduct),
 390             dev->descriptor.bNumConfigurations,
 391             dev->actconfig->desc.bConfigurationValue);
 392
 393         /* create device structure */
 394         tdev = kzalloc(sizeof(struct ti_device), GFP_KERNEL);
 395         if (tdev == NULL) {
 396                 dev_err(&dev->dev, "%s - out of memory\n", __func__);
 397                 return -ENOMEM;
 398         }
 399         mutex_init(&tdev->td_open_close_lock);
 400         tdev->td_serial = serial;
 401         usb_set_serial_data(serial, tdev);
 402
 403         /* determine device type */
 404         if (usb_match_id(serial->interface, ti_id_table_3410))
 405                 tdev->td_is_3410 = 1;
 406         dbg("%s - device type is %s", __func__,
 407                                 tdev->td_is_3410 ? "3410" : "5052");
 408
 409         /* if we have only 1 configuration, download firmware */
 410         if (dev->descriptor.bNumConfigurations == 1) {
 411                 if ((status = ti_download_firmware(tdev)) != 0)
 412                         goto free_tdev;
 413
 414                 /* 3410 must be reset, 5052 resets itself */
 415                 if (tdev->td_is_3410) {
 416                         msleep_interruptible(100);
 417                         usb_reset_device(dev);
 418                 }
 419
 420                 status = -ENODEV;
 421                 goto free_tdev;
 422         }
 423
 424         /* the second configuration must be set */
 425         if (dev->actconfig->desc.bConfigurationValue == TI_BOOT_CONFIG) {
 426                 status = usb_driver_set_configuration(dev, TI_ACTIVE_CONFIG);
 427                 status = status ? status : -ENODEV;
 428                 goto free_tdev;
 429         }
 430
 431         /* set up port structures */
 432         for (i = 0; i < serial->num_ports; ++i) {
 433                 tport = kzalloc(sizeof(struct ti_port), GFP_KERNEL);
 434                 if (tport == NULL) {
 435                         dev_err(&dev->dev, "%s - out of memory\n", __func__);
 436                         status = -ENOMEM;
 437                         goto free_tports;
 438                 }
 439                 spin_lock_init(&tport->tp_lock);
 440                 tport->tp_uart_base_addr = (i == 0 ?
 441                                 TI_UART1_BASE_ADDR : TI_UART2_BASE_ADDR);
 442                 tport->tp_closing_wait = closing_wait;
 443                 init_waitqueue_head(&tport->tp_msr_wait);
 444                 init_waitqueue_head(&tport->tp_write_wait);
 445                 tport->tp_write_buf = ti_buf_alloc();
 446                 if (tport->tp_write_buf == NULL) {
 447                         dev_err(&dev->dev, "%s - out of memory\n", __func__);
 448                         kfree(tport);
 449                         status = -ENOMEM;
 450                         goto free_tports;
 451                 }
 452                 tport->tp_port = serial->port[i];
 453                 tport->tp_tdev = tdev;
 454                 usb_set_serial_port_data(serial->port[i], tport);
 455                 tport->tp_uart_mode = 0;        /* default is RS232 */
 456         }
 457
 458         return 0;
 459
 460 free_tports:
 461         for (--i; i >= 0; --i) {
 462                 tport = usb_get_serial_port_data(serial->port[i]);
 463                 ti_buf_free(tport->tp_write_buf);
 464                 kfree(tport);
 465                 usb_set_serial_port_data(serial->port[i], NULL);
 466         }
 467 free_tdev:
 468         kfree(tdev);
 469         usb_set_serial_data(serial, NULL);
 470         return status;
 471 }
 472
 473
 474 static void ti_release(struct usb_serial *serial)
 475 {
 476         int i;
 477         struct ti_device *tdev = usb_get_serial_data(serial);
 478         struct ti_port *tport;
 479
 480         dbg("%s", __func__);
 481
 482         for (i = 0; i < serial->num_ports; ++i) {
 483                 tport = usb_get_serial_port_data(serial->port[i]);
 484                 if (tport) {
 485                         ti_buf_free(tport->tp_write_buf);
 486                         kfree(tport);
 487                 }
 488         }
 489
 490         kfree(tdev);
 491 }
 492
 493
 494 static int ti_open(struct tty_struct *tty, struct usb_serial_port *port)
 495 {
 496         struct ti_port *tport = usb_get_serial_port_data(port);
 497         struct ti_device *tdev;
 498         struct usb_device *dev;
 499         struct urb *urb;
 500         int port_number;
 501         int status;
 502         __u16 open_settings = (__u8)(TI_PIPE_MODE_CONTINOUS |
 503                              TI_PIPE_TIMEOUT_ENABLE |
 504                              (TI_TRANSFER_TIMEOUT << 2));
 505
 506         dbg("%s - port %d", __func__, port->number);
 507
 508         if (tport == NULL)
 509                 return -ENODEV;
 510
 511         dev = port->serial->dev;
 512         tdev = tport->tp_tdev;
 513
 514         /* only one open on any port on a device at a time */
 515         if (mutex_lock_interruptible(&tdev->td_open_close_lock))
 516                 return -ERESTARTSYS;
 517
 518         port_number = port->number - port->serial->minor;
 519
 520         memset(&(tport->tp_icount), 0x00, sizeof(tport->tp_icount));
 521
 522         tport->tp_msr = 0;
 523         tport->tp_shadow_mcr |= (TI_MCR_RTS | TI_MCR_DTR);
 524
 525         /* start interrupt urb the first time a port is opened on this device */
 526         if (tdev->td_open_port_count == 0) {
 527                 dbg("%s - start interrupt in urb", __func__);
 528                 urb = tdev->td_serial->port[0]->interrupt_in_urb;
 529                 if (!urb) {
 530                         dev_err(&port->dev, "%s - no interrupt urb\n",
 531                                                                 __func__);
 532                         status = -EINVAL;
 533                         goto release_lock;
 534                 }
 535                 urb->complete = ti_interrupt_callback;
 536                 urb->context = tdev;
 537                 urb->dev = dev;
 538                 status = usb_submit_urb(urb, GFP_KERNEL);
 539                 if (status) {
 540                         dev_err(&port->dev,
 541                                 "%s - submit interrupt urb failed, %d\n",
 542                                         __func__, status);
 543                         goto release_lock;
 544                 }
 545         }
 546
 547         if (tty)
 548                 ti_set_termios(tty, port, tty->termios);
 549
 550         dbg("%s - sending TI_OPEN_PORT", __func__);
 551         status = ti_command_out_sync(tdev, TI_OPEN_PORT,
 552                 (__u8)(TI_UART1_PORT + port_number), open_settings, NULL, 0);
 553         if (status) {
 554                 dev_err(&port->dev, "%s - cannot send open command, %d\n",
 555                                                         __func__, status);
 556                 goto unlink_int_urb;
 557         }
 558
 559         dbg("%s - sending TI_START_PORT", __func__);
 560         status = ti_command_out_sync(tdev, TI_START_PORT,
 561                 (__u8)(TI_UART1_PORT + port_number), 0, NULL, 0);
 562         if (status) {
 563                 dev_err(&port->dev, "%s - cannot send start command, %d\n",
 564                                                         __func__, status);
 565                 goto unlink_int_urb;
 566         }
 567
 568         dbg("%s - sending TI_PURGE_PORT", __func__);
 569         status = ti_command_out_sync(tdev, TI_PURGE_PORT,
 570                 (__u8)(TI_UART1_PORT + port_number), TI_PURGE_INPUT, NULL, 0);
 571         if (status) {
 572                 dev_err(&port->dev, "%s - cannot clear input buffers, %d\n",
 573                                                         __func__, status);
 574                 goto unlink_int_urb;
 575         }
 576         status = ti_command_out_sync(tdev, TI_PURGE_PORT,
 577                 (__u8)(TI_UART1_PORT + port_number), TI_PURGE_OUTPUT, NULL, 0);
 578         if (status) {
 579                 dev_err(&port->dev, "%s - cannot clear output buffers, %d\n",
 580                                                         __func__, status);
 581                 goto unlink_int_urb;
 582         }
 583
 584         /* reset the data toggle on the bulk endpoints to work around bug in
 585          * host controllers where things get out of sync some times */
 586         usb_clear_halt(dev, port->write_urb->pipe);
 587         usb_clear_halt(dev, port->read_urb->pipe);
 588
 589         if (tty)
 590                 ti_set_termios(tty, port, tty->termios);
 591
 592         dbg("%s - sending TI_OPEN_PORT (2)", __func__);
 593         status = ti_command_out_sync(tdev, TI_OPEN_PORT,
 594                 (__u8)(TI_UART1_PORT + port_number), open_settings, NULL, 0);
 595         if (status) {
 596                 dev_err(&port->dev, "%s - cannot send open command (2), %d\n",
 597                                                         __func__, status);
 598                 goto unlink_int_urb;
 599         }
 600
 601         dbg("%s - sending TI_START_PORT (2)", __func__);
 602         status = ti_command_out_sync(tdev, TI_START_PORT,
 603                 (__u8)(TI_UART1_PORT + port_number), 0, NULL, 0);
 604         if (status) {
 605                 dev_err(&port->dev, "%s - cannot send start command (2), %d\n",
 606                                                         __func__, status);
 607                 goto unlink_int_urb;
 608         }
 609
 610         /* start read urb */
 611         dbg("%s - start read urb", __func__);
 612         urb = port->read_urb;
 613         if (!urb) {
 614                 dev_err(&port->dev, "%s - no read urb\n", __func__);
 615                 status = -EINVAL;
 616                 goto unlink_int_urb;
 617         }
 618         tport->tp_read_urb_state = TI_READ_URB_RUNNING;
 619         urb->complete = ti_bulk_in_callback;
 620         urb->context = tport;
 621         urb->dev = dev;
 622         status = usb_submit_urb(urb, GFP_KERNEL);
 623         if (status) {
 624                 dev_err(&port->dev, "%s - submit read urb failed, %d\n",
 625                                                         __func__, status);
 626                 goto unlink_int_urb;
 627         }
 628
 629         tport->tp_is_open = 1;
 630         ++tdev->td_open_port_count;
 631
 632         goto release_lock;
 633
 634 unlink_int_urb:
 635         if (tdev->td_open_port_count == 0)
 636                 usb_kill_urb(port->serial->port[0]->interrupt_in_urb);
 637 release_lock:
 638         mutex_unlock(&tdev->td_open_close_lock);
 639         dbg("%s - exit %d", __func__, status);
 640         return status;
 641 }
 642
 643
 644 static void ti_close(struct usb_serial_port *port)
 645 {
 646         struct ti_device *tdev;
 647         struct ti_port *tport;
 648         int port_number;
 649         int status;
 650         int do_unlock;
 651
 652         dbg("%s - port %d", __func__, port->number);
 653
 654         tdev = usb_get_serial_data(port->serial);
 655         tport = usb_get_serial_port_data(port);
 656         if (tdev == NULL || tport == NULL)
 657                 return;
 658
 659         tport->tp_is_open = 0;
 660
 661         ti_drain(tport, (tport->tp_closing_wait*HZ)/100, 1);
 662
 663         usb_kill_urb(port->read_urb);
 664         usb_kill_urb(port->write_urb);
 665         tport->tp_write_urb_in_use = 0;
 666
 667         port_number = port->number - port->serial->minor;
 668
 669         dbg("%s - sending TI_CLOSE_PORT", __func__);
 670         status = ti_command_out_sync(tdev, TI_CLOSE_PORT,
 671                      (__u8)(TI_UART1_PORT + port_number), 0, NULL, 0);
 672         if (status)
 673                 dev_err(&port->dev,
 674                         "%s - cannot send close port command, %d\n"
 675                                                         , __func__, status);
 676
 677         /* if mutex_lock is interrupted, continue anyway */
 678         do_unlock = !mutex_lock_interruptible(&tdev->td_open_close_lock);
 679         --tport->tp_tdev->td_open_port_count;
 680         if (tport->tp_tdev->td_open_port_count <= 0) {
 681                 /* last port is closed, shut down interrupt urb */
 682                 usb_kill_urb(port->serial->port[0]->interrupt_in_urb);
 683                 tport->tp_tdev->td_open_port_count = 0;
 684         }
 685         if (do_unlock)
 686                 mutex_unlock(&tdev->td_open_close_lock);
 687
 688         dbg("%s - exit", __func__);
 689 }
 690
 691
 692 static int ti_write(struct tty_struct *tty, struct usb_serial_port *port,
 693                         const unsigned char *data, int count)
 694 {
 695         struct ti_port *tport = usb_get_serial_port_data(port);
 696         unsigned long flags;
 697
 698         dbg("%s - port %d", __func__, port->number);
 699
 700         if (count == 0) {
 701                 dbg("%s - write request of 0 bytes", __func__);
 702                 return 0;
 703         }
 704
 705         if (tport == NULL || !tport->tp_is_open)
 706                 return -ENODEV;
 707
 708         spin_lock_irqsave(&tport->tp_lock, flags);
 709         count = ti_buf_put(tport->tp_write_buf, data, count);
 710         spin_unlock_irqrestore(&tport->tp_lock, flags);
 711
 712         ti_send(tport);
 713
 714         return count;
 715 }
 716
 717
 718 static int ti_write_room(struct tty_struct *tty)
 719 {
 720         struct usb_serial_port *port = tty->driver_data;
 721         struct ti_port *tport = usb_get_serial_port_data(port);
 722         int room = 0;
 723         unsigned long flags;
 724
 725         dbg("%s - port %d", __func__, port->number);
 726
 727         if (tport == NULL)
 728                 return 0;
 729
 730         spin_lock_irqsave(&tport->tp_lock, flags);
 731         room = ti_buf_space_avail(tport->tp_write_buf);
 732         spin_unlock_irqrestore(&tport->tp_lock, flags);
 733
 734         dbg("%s - returns %d", __func__, room);
 735         return room;
 736 }
 737
 738
 739 static int ti_chars_in_buffer(struct tty_struct *tty)
 740 {
 741         struct usb_serial_port *port = tty->driver_data;
 742         struct ti_port *tport = usb_get_serial_port_data(port);
 743         int chars = 0;
 744         unsigned long flags;
 745
 746         dbg("%s - port %d", __func__, port->number);
 747
 748         if (tport == NULL)
 749                 return 0;
 750
 751         spin_lock_irqsave(&tport->tp_lock, flags);
 752         chars = ti_buf_data_avail(tport->tp_write_buf);
 753         spin_unlock_irqrestore(&tport->tp_lock, flags);
 754
 755         dbg("%s - returns %d", __func__, chars);
 756         return chars;
 757 }
 758
 759
 760 static void ti_throttle(struct tty_struct *tty)
 761 {
 762         struct usb_serial_port *port = tty->driver_data;
 763         struct ti_port *tport = usb_get_serial_port_data(port);
 764
 765         dbg("%s - port %d", __func__, port->number);
 766
 767         if (tport == NULL)
 768                 return;
 769
 770         if (I_IXOFF(tty) || C_CRTSCTS(tty))
 771                 ti_stop_read(tport, tty);
 772
 773 }
 774
 775
 776 static void ti_unthrottle(struct tty_struct *tty)
 777 {
 778         struct usb_serial_port *port = tty->driver_data;
 779         struct ti_port *tport = usb_get_serial_port_data(port);
 780         int status;
 781
 782         dbg("%s - port %d", __func__, port->number);
 783
 784         if (tport == NULL)
 785                 return;
 786
 787         if (I_IXOFF(tty) || C_CRTSCTS(tty)) {
 788                 status = ti_restart_read(tport, tty);
 789                 if (status)
 790                         dev_err(&port->dev, "%s - cannot restart read, %d\n",
 791                                                         __func__, status);
 792         }
 793 }
 794
 795
 796 static int ti_ioctl(struct tty_struct *tty, struct file *file,
 797         unsigned int cmd, unsigned long arg)
 798 {
 799         struct usb_serial_port *port = tty->driver_data;
 800         struct ti_port *tport = usb_get_serial_port_data(port);
 801         struct async_icount cnow;
 802         struct async_icount cprev;
 803
 804         dbg("%s - port %d, cmd = 0x%04X", __func__, port->number, cmd);
 805
 806         if (tport == NULL)
 807                 return -ENODEV;
 808
 809         switch (cmd) {
 810         case TIOCGSERIAL:
 811                 dbg("%s - (%d) TIOCGSERIAL", __func__, port->number);
 812                 return ti_get_serial_info(tport,
 813                                 (struct serial_struct __user *)arg);
 814         case TIOCSSERIAL:
 815                 dbg("%s - (%d) TIOCSSERIAL", __func__, port->number);
 816                 return ti_set_serial_info(tty, tport,
 817                                 (struct serial_struct __user *)arg);
 818         case TIOCMIWAIT:
 819                 dbg("%s - (%d) TIOCMIWAIT", __func__, port->number);
 820                 cprev = tport->tp_icount;
 821                 while (1) {
 822                         interruptible_sleep_on(&tport->tp_msr_wait);
 823                         if (signal_pending(current))
 824                                 return -ERESTARTSYS;
 825                         cnow = tport->tp_icount;
 826                         if (cnow.rng == cprev.rng && cnow.dsr == cprev.dsr &&
 827                             cnow.dcd == cprev.dcd && cnow.cts == cprev.cts)
 828                                 return -EIO; /* no change => error */
 829                         if (((arg & TIOCM_RNG) && (cnow.rng != cprev.rng)) ||
 830                             ((arg & TIOCM_DSR) && (cnow.dsr != cprev.dsr)) ||
 831                             ((arg & TIOCM_CD)  && (cnow.dcd != cprev.dcd)) ||
 832                             ((arg & TIOCM_CTS) && (cnow.cts != cprev.cts)))
 833                                 return 0;
 834                         cprev = cnow;
 835                 }
 836                 break;
 837         case TIOCGICOUNT:
 838                 dbg("%s - (%d) TIOCGICOUNT RX=%d, TX=%d",
 839                                 __func__, port->number,
 840                                 tport->tp_icount.rx, tport->tp_icount.tx);
 841                 if (copy_to_user((void __user *)arg, &tport->tp_icount,
 842                                         sizeof(tport->tp_icount)))
 843                         return -EFAULT;
 844                 return 0;
 845         }
 846         return -ENOIOCTLCMD;
 847 }
 848
 849
 850 static void ti_set_termios(struct tty_struct *tty,
 851                 struct usb_serial_port *port, struct ktermios *old_termios)
 852 {
 853         struct ti_port *tport = usb_get_serial_port_data(port);
 854         struct ti_uart_config *config;
 855         tcflag_t cflag, iflag;
 856         int baud;
 857         int status;
 858         int port_number = port->number - port->serial->minor;
 859         unsigned int mcr;
 860
 861         dbg("%s - port %d", __func__, port->number);
 862
 863         cflag = tty->termios->c_cflag;
 864         iflag = tty->termios->c_iflag;
 865
 866         dbg("%s - cflag %08x, iflag %08x", __func__, cflag, iflag);
 867         dbg("%s - old clfag %08x, old iflag %08x", __func__,
 868                                 old_termios->c_cflag, old_termios->c_iflag);
 869
 870         if (tport == NULL)
 871                 return;
 872
 873         config = kmalloc(sizeof(*config), GFP_KERNEL);
 874         if (!config) {
 875                 dev_err(&port->dev, "%s - out of memory\n", __func__);
 876                 return;
 877         }
 878
 879         config->wFlags = 0;
 880
 881         /* these flags must be set */
 882         config->wFlags |= TI_UART_ENABLE_MS_INTS;
 883         config->wFlags |= TI_UART_ENABLE_AUTO_START_DMA;
 884         config->bUartMode = (__u8)(tport->tp_uart_mode);
 885
 886         switch (cflag & CSIZE) {
 887         case CS5:
 888                     config->bDataBits = TI_UART_5_DATA_BITS;
 889                     break;
 890         case CS6:
 891                     config->bDataBits = TI_UART_6_DATA_BITS;
 892                     break;
 893         case CS7:
 894                     config->bDataBits = TI_UART_7_DATA_BITS;
 895                     break;
 896         default:
 897         case CS8:
 898                     config->bDataBits = TI_UART_8_DATA_BITS;
 899                     break;
 900         }
 901
 902         /* CMSPAR isn't supported by this driver */
 903         tty->termios->c_cflag &= ~CMSPAR;
 904
 905         if (cflag & PARENB) {
 906                 if (cflag & PARODD) {
 907                         config->wFlags |= TI_UART_ENABLE_PARITY_CHECKING;
 908                         config->bParity = TI_UART_ODD_PARITY;
 909                 } else {
 910                         config->wFlags |= TI_UART_ENABLE_PARITY_CHECKING;
 911                         config->bParity = TI_UART_EVEN_PARITY;
 912                 }
 913         } else {
 914                 config->wFlags &= ~TI_UART_ENABLE_PARITY_CHECKING;
 915                 config->bParity = TI_UART_NO_PARITY;
 916         }
 917
 918         if (cflag & CSTOPB)
 919                 config->bStopBits = TI_UART_2_STOP_BITS;
 920         else
 921                 config->bStopBits = TI_UART_1_STOP_BITS;
 922
 923         if (cflag & CRTSCTS) {
 924                 /* RTS flow control must be off to drop RTS for baud rate B0 */
 925                 if ((cflag & CBAUD) != B0)
 926                         config->wFlags |= TI_UART_ENABLE_RTS_IN;
 927                 config->wFlags |= TI_UART_ENABLE_CTS_OUT;
 928         } else {
 929                 tty->hw_stopped = 0;
 930                 ti_restart_read(tport, tty);
 931         }
 932
 933         if (I_IXOFF(tty) || I_IXON(tty)) {
 934                 config->cXon  = START_CHAR(tty);
 935                 config->cXoff = STOP_CHAR(tty);
 936
 937                 if (I_IXOFF(tty))
 938                         config->wFlags |= TI_UART_ENABLE_X_IN;
 939                 else
 940                         ti_restart_read(tport, tty);
 941
 942                 if (I_IXON(tty))
 943                         config->wFlags |= TI_UART_ENABLE_X_OUT;
 944         }
 945
 946         baud = tty_get_baud_rate(tty);
 947         if (!baud)
 948                 baud = 9600;
 949         if (tport->tp_tdev->td_is_3410)
 950                 config->wBaudRate = (__u16)((923077 + baud/2) / baud);
 951         else
 952                 config->wBaudRate = (__u16)((461538 + baud/2) / baud);
 953
 954         /* FIXME: Should calculate resulting baud here and report it back */
 955         if ((cflag & CBAUD) != B0)
 956                 tty_encode_baud_rate(tty, baud, baud);
 957
 958         dbg("%s - BaudRate=%d, wBaudRate=%d, wFlags=0x%04X, bDataBits=%d, bParity=%d, bStopBits=%d, cXon=%d, cXoff=%d, bUartMode=%d",
 959         __func__, baud, config->wBaudRate, config->wFlags, config->bDataBits, config->bParity, config->bStopBits, config->cXon, config->cXoff, config->bUartMode);
 960
 961         cpu_to_be16s(&config->wBaudRate);
 962         cpu_to_be16s(&config->wFlags);
 963
 964         status = ti_command_out_sync(tport->tp_tdev, TI_SET_CONFIG,
 965                 (__u8)(TI_UART1_PORT + port_number), 0, (__u8 *)config,
 966                 sizeof(*config));
 967         if (status)
 968                 dev_err(&port->dev, "%s - cannot set config on port %d, %d\n",
 969                                         __func__, port_number, status);
 970
 971         /* SET_CONFIG asserts RTS and DTR, reset them correctly */
 972         mcr = tport->tp_shadow_mcr;
 973         /* if baud rate is B0, clear RTS and DTR */
 974         if ((cflag & CBAUD) == B0)
 975                 mcr &= ~(TI_MCR_DTR | TI_MCR_RTS);
 976         status = ti_set_mcr(tport, mcr);
 977         if (status)
 978                 dev_err(&port->dev,
 979                         "%s - cannot set modem control on port %d, %d\n",
 980                                                 __func__, port_number, status);
 981
 982         kfree(config);
 983 }
 984
 985
 986 static int ti_tiocmget(struct tty_struct *tty, struct file *file)
 987 {
 988         struct usb_serial_port *port = tty->driver_data;
 989         struct ti_port *tport = usb_get_serial_port_data(port);
 990         unsigned int result;
 991         unsigned int msr;
 992         unsigned int mcr;
 993         unsigned long flags;
 994
 995         dbg("%s - port %d", __func__, port->number);
 996
 997         if (tport == NULL)
 998                 return -ENODEV;
 999
1000         spin_lock_irqsave(&tport->tp_lock, flags);
1001         msr = tport->tp_msr;
1002         mcr = tport->tp_shadow_mcr;
1003         spin_unlock_irqrestore(&tport->tp_lock, flags);
1004
1005         result = ((mcr & TI_MCR_DTR) ? TIOCM_DTR : 0)
1006                 | ((mcr & TI_MCR_RTS) ? TIOCM_RTS : 0)
1007                 | ((mcr & TI_MCR_LOOP) ? TIOCM_LOOP : 0)
1008                 | ((msr & TI_MSR_CTS) ? TIOCM_CTS : 0)
1009                 | ((msr & TI_MSR_CD) ? TIOCM_CAR : 0)
1010                 | ((msr & TI_MSR_RI) ? TIOCM_RI : 0)
1011                 | ((msr & TI_MSR_DSR) ? TIOCM_DSR : 0);
1012
1013         dbg("%s - 0x%04X", __func__, result);
1014
1015         return result;
1016 }
1017
1018
1019 static int ti_tiocmset(struct tty_struct *tty, struct file *file,
1020         unsigned int set, unsigned int clear)
1021 {
1022         struct usb_serial_port *port = tty->driver_data;
1023         struct ti_port *tport = usb_get_serial_port_data(port);
1024         unsigned int mcr;
1025         unsigned long flags;
1026
1027         dbg("%s - port %d", __func__, port->number);
1028
1029         if (tport == NULL)
1030                 return -ENODEV;
1031
1032         spin_lock_irqsave(&tport->tp_lock, flags);
1033         mcr = tport->tp_shadow_mcr;
1034
1035         if (set & TIOCM_RTS)
1036                 mcr |= TI_MCR_RTS;
1037         if (set & TIOCM_DTR)
1038                 mcr |= TI_MCR_DTR;
1039         if (set & TIOCM_LOOP)
1040                 mcr |= TI_MCR_LOOP;
1041
1042         if (clear & TIOCM_RTS)
1043                 mcr &= ~TI_MCR_RTS;
1044         if (clear & TIOCM_DTR)
1045                 mcr &= ~TI_MCR_DTR;
1046         if (clear & TIOCM_LOOP)
1047                 mcr &= ~TI_MCR_LOOP;
1048         spin_unlock_irqrestore(&tport->tp_lock, flags);
1049
1050         return ti_set_mcr(tport, mcr);
1051 }
1052
1053
1054 static void ti_break(struct tty_struct *tty, int break_state)
1055 {
1056         struct usb_serial_port *port = tty->driver_data;
1057         struct ti_port *tport = usb_get_serial_port_data(port);
1058         int status;
1059
1060         dbg("%s - state = %d", __func__, break_state);
1061
1062         if (tport == NULL)
1063                 return;
1064
1065         ti_drain(tport, (tport->tp_closing_wait*HZ)/100, 0);
1066
1067         status = ti_write_byte(tport->tp_tdev,
1068                 tport->tp_uart_base_addr + TI_UART_OFFSET_LCR,
1069                 TI_LCR_BREAK, break_state == -1 ? TI_LCR_BREAK : 0);
1070
1071         if (status)
1072                 dbg("%s - error setting break, %d", __func__, status);
1073 }
1074
1075
1076 static void ti_interrupt_callback(struct urb *urb)
1077 {
1078         struct ti_device *tdev = urb->context;
1079         struct usb_serial_port *port;
1080         struct usb_serial *serial = tdev->td_serial;
1081         struct ti_port *tport;
1082         struct device *dev = &urb->dev->dev;
1083         unsigned char *data = urb->transfer_buffer;
1084         int length = urb->actual_length;
1085         int port_number;
1086         int function;
1087         int status = urb->status;
1088         int retval;
1089         __u8 msr;
1090
1091         dbg("%s", __func__);
1092
1093         switch (status) {
1094         case 0:
1095                 break;
1096         case -ECONNRESET:
1097         case -ENOENT:
1098         case -ESHUTDOWN:
1099                 dbg("%s - urb shutting down, %d", __func__, status);
1100                 tdev->td_urb_error = 1;
1101                 return;
1102         default:
1103                 dev_err(dev, "%s - nonzero urb status, %d\n",
1104                         __func__, status);
1105                 tdev->td_urb_error = 1;
1106                 goto exit;
1107         }
1108
1109         if (length != 2) {
1110                 dbg("%s - bad packet size, %d", __func__, length);
1111                 goto exit;
1112         }
1113
1114         if (data[0] == TI_CODE_HARDWARE_ERROR) {
1115                 dev_err(dev, "%s - hardware error, %d\n", __func__, data[1]);
1116                 goto exit;
1117         }
1118
1119         port_number = TI_GET_PORT_FROM_CODE(data[0]);
1120         function = TI_GET_FUNC_FROM_CODE(data[0]);
1121
1122         dbg("%s - port_number %d, function %d, data 0x%02X",
1123                                 __func__, port_number, function, data[1]);
1124
1125         if (port_number >= serial->num_ports) {
1126                 dev_err(dev, "%s - bad port number, %d\n",
1127                                                 __func__, port_number);
1128                 goto exit;
1129         }
1130
1131         port = serial->port[port_number];
1132
1133         tport = usb_get_serial_port_data(port);
1134         if (!tport)
1135                 goto exit;
1136
1137         switch (function) {
1138         case TI_CODE_DATA_ERROR:
1139                 dev_err(dev, "%s - DATA ERROR, port %d, data 0x%02X\n",
1140                                         __func__, port_number, data[1]);
1141                 break;
1142
1143         case TI_CODE_MODEM_STATUS:
1144                 msr = data[1];
1145                 dbg("%s - port %d, msr 0x%02X", __func__, port_number, msr);
1146                 ti_handle_new_msr(tport, msr);
1147                 break;
1148
1149         default:
1150                 dev_err(dev, "%s - unknown interrupt code, 0x%02X\n",
1151                                                         __func__, data[1]);
1152                 break;
1153         }
1154
1155 exit:
1156         retval = usb_submit_urb(urb, GFP_ATOMIC);
1157         if (retval)
1158                 dev_err(dev, "%s - resubmit interrupt urb failed, %d\n",
1159                         __func__, retval);
1160 }
1161
1162
1163 static void ti_bulk_in_callback(struct urb *urb)
1164 {
1165         struct ti_port *tport = urb->context;
1166         struct usb_serial_port *port = tport->tp_port;
1167         struct device *dev = &urb->dev->dev;
1168         int status = urb->status;
1169         int retval = 0;
1170         struct tty_struct *tty;
1171
1172         dbg("%s", __func__);
1173
1174         switch (status) {
1175         case 0:
1176                 break;
1177         case -ECONNRESET:
1178         case -ENOENT:
1179         case -ESHUTDOWN:
1180                 dbg("%s - urb shutting down, %d", __func__, status);
1181                 tport->tp_tdev->td_urb_error = 1;
1182                 wake_up_interruptible(&tport->tp_write_wait);
1183                 return;
1184         default:
1185                 dev_err(dev, "%s - nonzero urb status, %d\n",
1186                         __func__, status);
1187                 tport->tp_tdev->td_urb_error = 1;
1188                 wake_up_interruptible(&tport->tp_write_wait);
1189         }
1190
1191         if (status == -EPIPE)
1192                 goto exit;
1193
1194         if (status) {
1195                 dev_err(dev, "%s - stopping read!\n", __func__);
1196                 return;
1197         }
1198
1199         tty = tty_port_tty_get(&port->port);
1200         if (tty) {
1201                 if (urb->actual_length) {
1202                         usb_serial_debug_data(debug, dev, __func__,
1203                                 urb->actual_length, urb->transfer_buffer);
1204
1205                         if (!tport->tp_is_open)
1206                                 dbg("%s - port closed, dropping data",
1207                                         __func__);
1208                         else
1209                                 ti_recv(&urb->dev->dev, tty,
1210                                                 urb->transfer_buffer,
1211                                                 urb->actual_length);
1212                         spin_lock(&tport->tp_lock);
1213                         tport->tp_icount.rx += urb->actual_length;
1214                         spin_unlock(&tport->tp_lock);
1215                 }
1216                 tty_kref_put(tty);
1217         }
1218
1219 exit:
1220         /* continue to read unless stopping */
1221         spin_lock(&tport->tp_lock);
1222         if (tport->tp_read_urb_state == TI_READ_URB_RUNNING) {
1223                 urb->dev = port->serial->dev;
1224                 retval = usb_submit_urb(urb, GFP_ATOMIC);
1225         } else if (tport->tp_read_urb_state == TI_READ_URB_STOPPING) {
1226                 tport->tp_read_urb_state = TI_READ_URB_STOPPED;
1227         }
1228         spin_unlock(&tport->tp_lock);
1229         if (retval)
1230                 dev_err(dev, "%s - resubmit read urb failed, %d\n",
1231                         __func__, retval);
1232 }
1233
1234
1235 static void ti_bulk_out_callback(struct urb *urb)
1236 {
1237         struct ti_port *tport = urb->context;
1238         struct usb_serial_port *port = tport->tp_port;
1239         struct device *dev = &urb->dev->dev;
1240         int status = urb->status;
1241
1242         dbg("%s - port %d", __func__, port->number);
1243
1244         tport->tp_write_urb_in_use = 0;
1245
1246         switch (status) {
1247         case 0:
1248                 break;
1249         case -ECONNRESET:
1250         case -ENOENT:
1251         case -ESHUTDOWN:
1252                 dbg("%s - urb shutting down, %d", __func__, status);
1253                 tport->tp_tdev->td_urb_error = 1;
1254                 wake_up_interruptible(&tport->tp_write_wait);
1255                 return;
1256         default:
1257                 dev_err(dev, "%s - nonzero urb status, %d\n",
1258                         __func__, status);
1259                 tport->tp_tdev->td_urb_error = 1;
1260                 wake_up_interruptible(&tport->tp_write_wait);
1261         }
1262
1263         /* send any buffered data */
1264         ti_send(tport);
1265 }
1266
1267
1268 static void ti_recv(struct device *dev, struct tty_struct *tty,
1269         unsigned char *data, int length)
1270 {
1271         int cnt;
1272
1273         do {
1274                 cnt = tty_insert_flip_string(tty, data, length);
1275                 if (cnt < length) {
1276                         dev_err(dev, "%s - dropping data, %d bytes lost\n",
1277                                                 __func__, length - cnt);
1278                         if (cnt == 0)
1279                                 break;
1280                 }
1281                 tty_flip_buffer_push(tty);
1282                 data += cnt;
1283                 length -= cnt;
1284         } while (length > 0);
1285
1286 }
1287
1288
1289 static void ti_send(struct ti_port *tport)
1290 {
1291         int count, result;
1292         struct usb_serial_port *port = tport->tp_port;
1293         struct tty_struct *tty = tty_port_tty_get(&port->port); /* FIXME */
1294         unsigned long flags;
1295
1296
1297         dbg("%s - port %d", __func__, port->number);
1298
1299         spin_lock_irqsave(&tport->tp_lock, flags);
1300
1301         if (tport->tp_write_urb_in_use)
1302                 goto unlock;
1303
1304         count = ti_buf_get(tport->tp_write_buf,
1305                                 port->write_urb->transfer_buffer,
1306                                 port->bulk_out_size);
1307
1308         if (count == 0)
1309                 goto unlock;
1310
1311         tport->tp_write_urb_in_use = 1;
1312
1313         spin_unlock_irqrestore(&tport->tp_lock, flags);
1314
1315         usb_serial_debug_data(debug, &port->dev, __func__, count,
1316                                         port->write_urb->transfer_buffer);
1317
1318         usb_fill_bulk_urb(port->write_urb, port->serial->dev,
1319                            usb_sndbulkpipe(port->serial->dev,
1320                                             port->bulk_out_endpointAddress),
1321                            port->write_urb->transfer_buffer, count,
1322                            ti_bulk_out_callback, tport);
1323
1324         result = usb_submit_urb(port->write_urb, GFP_ATOMIC);
1325         if (result) {
1326                 dev_err(&port->dev, "%s - submit write urb failed, %d\n",
1327                                                         __func__, result);
1328                 tport->tp_write_urb_in_use = 0;
1329                 /* TODO: reschedule ti_send */
1330         } else {
1331                 spin_lock_irqsave(&tport->tp_lock, flags);
1332                 tport->tp_icount.tx += count;
1333                 spin_unlock_irqrestore(&tport->tp_lock, flags);
1334         }
1335
1336         /* more room in the buffer for new writes, wakeup */
1337         if (tty)
1338                 tty_wakeup(tty);
1339         tty_kref_put(tty);
1340         wake_up_interruptible(&tport->tp_write_wait);
1341         return;
1342 unlock:
1343         spin_unlock_irqrestore(&tport->tp_lock, flags);
1344         tty_kref_put(tty);
1345         return;
1346 }
1347
1348
1349 static int ti_set_mcr(struct ti_port *tport, unsigned int mcr)
1350 {
1351         unsigned long flags;
1352         int status;
1353
1354         status = ti_write_byte(tport->tp_tdev,
1355                 tport->tp_uart_base_addr + TI_UART_OFFSET_MCR,
1356                 TI_MCR_RTS | TI_MCR_DTR | TI_MCR_LOOP, mcr);
1357
1358         spin_lock_irqsave(&tport->tp_lock, flags);
1359         if (!status)
1360                 tport->tp_shadow_mcr = mcr;
1361         spin_unlock_irqrestore(&tport->tp_lock, flags);
1362
1363         return status;
1364 }
1365
1366
1367 static int ti_get_lsr(struct ti_port *tport)
1368 {
1369         int size, status;
1370         struct ti_device *tdev = tport->tp_tdev;
1371         struct usb_serial_port *port = tport->tp_port;
1372         int port_number = port->number - port->serial->minor;
1373         struct ti_port_status *data;
1374
1375         dbg("%s - port %d", __func__, port->number);
1376
1377         size = sizeof(struct ti_port_status);
1378         data = kmalloc(size, GFP_KERNEL);
1379         if (!data) {
1380                 dev_err(&port->dev, "%s - out of memory\n", __func__);
1381                 return -ENOMEM;
1382         }
1383
1384         status = ti_command_in_sync(tdev, TI_GET_PORT_STATUS,
1385                 (__u8)(TI_UART1_PORT+port_number), 0, (__u8 *)data, size);
1386         if (status) {
1387                 dev_err(&port->dev,
1388                         "%s - get port status command failed, %d\n",
1389                                                         __func__, status);
1390                 goto free_data;
1391         }
1392
1393         dbg("%s - lsr 0x%02X", __func__, data->bLSR);
1394
1395         tport->tp_lsr = data->bLSR;
1396
1397 free_data:
1398         kfree(data);
1399         return status;
1400 }
1401
1402
1403 static int ti_get_serial_info(struct ti_port *tport,
1404         struct serial_struct __user *ret_arg)
1405 {
1406         struct usb_serial_port *port = tport->tp_port;
1407         struct serial_struct ret_serial;
1408
1409         if (!ret_arg)
1410                 return -EFAULT;
1411
1412         memset(&ret_serial, 0, sizeof(ret_serial));
1413
1414         ret_serial.type = PORT_16550A;
1415         ret_serial.line = port->serial->minor;
1416         ret_serial.port = port->number - port->serial->minor;
1417         ret_serial.flags = tport->tp_flags;
1418         ret_serial.xmit_fifo_size = TI_WRITE_BUF_SIZE;
1419         ret_serial.baud_base = tport->tp_tdev->td_is_3410 ? 921600 : 460800;
1420         ret_serial.closing_wait = tport->tp_closing_wait;
1421
1422         if (copy_to_user(ret_arg, &ret_serial, sizeof(*ret_arg)))
1423                 return -EFAULT;
1424
1425         return 0;
1426 }
1427
1428
1429 static int ti_set_serial_info(struct tty_struct *tty, struct ti_port *tport,
1430         struct serial_struct __user *new_arg)
1431 {
1432         struct serial_struct new_serial;
1433
1434         if (copy_from_user(&new_serial, new_arg, sizeof(new_serial)))
1435                 return -EFAULT;
1436
1437         tport->tp_flags = new_serial.flags & TI_SET_SERIAL_FLAGS;
1438         tport->tp_closing_wait = new_serial.closing_wait;
1439
1440         return 0;
1441 }
1442
1443
1444 static void ti_handle_new_msr(struct ti_port *tport, __u8 msr)
1445 {
1446         struct async_icount *icount;
1447         struct tty_struct *tty;
1448         unsigned long flags;
1449
1450         dbg("%s - msr 0x%02X", __func__, msr);
1451
1452         if (msr & TI_MSR_DELTA_MASK) {
1453                 spin_lock_irqsave(&tport->tp_lock, flags);
1454                 icount = &tport->tp_icount;
1455                 if (msr & TI_MSR_DELTA_CTS)
1456                         icount->cts++;
1457                 if (msr & TI_MSR_DELTA_DSR)
1458                         icount->dsr++;
1459                 if (msr & TI_MSR_DELTA_CD)
1460                         icount->dcd++;
1461                 if (msr & TI_MSR_DELTA_RI)
1462                         icount->rng++;
1463                 wake_up_interruptible(&tport->tp_msr_wait);
1464                 spin_unlock_irqrestore(&tport->tp_lock, flags);
1465         }
1466
1467         tport->tp_msr = msr & TI_MSR_MASK;
1468
1469         /* handle CTS flow control */
1470         tty = tty_port_tty_get(&tport->tp_port->port);
1471         if (tty && C_CRTSCTS(tty)) {
1472                 if (msr & TI_MSR_CTS) {
1473                         tty->hw_stopped = 0;
1474                         tty_wakeup(tty);
1475                 } else {
1476                         tty->hw_stopped = 1;
1477                 }
1478         }
1479         tty_kref_put(tty);
1480 }
1481
1482
1483 static void ti_drain(struct ti_port *tport, unsigned long timeout, int flush)
1484 {
1485         struct ti_device *tdev = tport->tp_tdev;
1486         struct usb_serial_port *port = tport->tp_port;
1487         wait_queue_t wait;
1488
1489         dbg("%s - port %d", __func__, port->number);
1490
1491         spin_lock_irq(&tport->tp_lock);
1492
1493         /* wait for data to drain from the buffer */
1494         tdev->td_urb_error = 0;
1495         init_waitqueue_entry(&wait, current);
1496         add_wait_queue(&tport->tp_write_wait, &wait);
1497         for (;;) {
1498                 set_current_state(TASK_INTERRUPTIBLE);
1499                 if (ti_buf_data_avail(tport->tp_write_buf) == 0
1500                 || timeout == 0 || signal_pending(current)
1501                 || tdev->td_urb_error
1502                 || port->serial->disconnected)  /* disconnect */
1503                         break;
1504                 spin_unlock_irq(&tport->tp_lock);
1505                 timeout = schedule_timeout(timeout);
1506                 spin_lock_irq(&tport->tp_lock);
1507         }
1508         set_current_state(TASK_RUNNING);
1509         remove_wait_queue(&tport->tp_write_wait, &wait);
1510
1511         /* flush any remaining data in the buffer */
1512         if (flush)
1513                 ti_buf_clear(tport->tp_write_buf);
1514
1515         spin_unlock_irq(&tport->tp_lock);
1516
1517         mutex_lock(&port->serial->disc_mutex);
1518         /* wait for data to drain from the device */
1519         /* wait for empty tx register, plus 20 ms */
1520         timeout += jiffies;
1521         tport->tp_lsr &= ~TI_LSR_TX_EMPTY;
1522         while ((long)(jiffies - timeout) < 0 && !signal_pending(current)
1523         && !(tport->tp_lsr&TI_LSR_TX_EMPTY) && !tdev->td_urb_error
1524         && !port->serial->disconnected) {
1525                 if (ti_get_lsr(tport))
1526                         break;
1527                 mutex_unlock(&port->serial->disc_mutex);
1528                 msleep_interruptible(20);
1529                 mutex_lock(&port->serial->disc_mutex);
1530         }
1531         mutex_unlock(&port->serial->disc_mutex);
1532 }
1533
1534
1535 static void ti_stop_read(struct ti_port *tport, struct tty_struct *tty)
1536 {
1537         unsigned long flags;
1538
1539         spin_lock_irqsave(&tport->tp_lock, flags);
1540
1541         if (tport->tp_read_urb_state == TI_READ_URB_RUNNING)
1542                 tport->tp_read_urb_state = TI_READ_URB_STOPPING;
1543
1544         spin_unlock_irqrestore(&tport->tp_lock, flags);
1545 }
1546
1547
1548 static int ti_restart_read(struct ti_port *tport, struct tty_struct *tty)
1549 {
1550         struct urb *urb;
1551         int status = 0;
1552         unsigned long flags;
1553
1554         spin_lock_irqsave(&tport->tp_lock, flags);
1555
1556         if (tport->tp_read_urb_state == TI_READ_URB_STOPPED) {
1557                 tport->tp_read_urb_state = TI_READ_URB_RUNNING;
1558                 urb = tport->tp_port->read_urb;
1559                 spin_unlock_irqrestore(&tport->tp_lock, flags);
1560                 urb->complete = ti_bulk_in_callback;
1561                 urb->context = tport;
1562                 urb->dev = tport->tp_port->serial->dev;
1563                 status = usb_submit_urb(urb, GFP_KERNEL);
1564         } else  {
1565                 tport->tp_read_urb_state = TI_READ_URB_RUNNING;
1566                 spin_unlock_irqrestore(&tport->tp_lock, flags);
1567         }
1568
1569         return status;
1570 }
1571
1572
1573 static int ti_command_out_sync(struct ti_device *tdev, __u8 command,
1574         __u16 moduleid, __u16 value, __u8 *data, int size)
1575 {
1576         int status;
1577
1578         status = usb_control_msg(tdev->td_serial->dev,
1579                 usb_sndctrlpipe(tdev->td_serial->dev, 0), command,
1580                 (USB_TYPE_VENDOR | USB_RECIP_DEVICE | USB_DIR_OUT),
1581                 value, moduleid, data, size, 1000);
1582
1583         if (status == size)
1584                 status = 0;
1585
1586         if (status > 0)
1587                 status = -ECOMM;
1588
1589         return status;
1590 }
1591
1592
1593 static int ti_command_in_sync(struct ti_device *tdev, __u8 command,
1594         __u16 moduleid, __u16 value, __u8 *data, int size)
1595 {
1596         int status;
1597
1598         status = usb_control_msg(tdev->td_serial->dev,
1599                 usb_rcvctrlpipe(tdev->td_serial->dev, 0), command,
1600                 (USB_TYPE_VENDOR | USB_RECIP_DEVICE | USB_DIR_IN),
1601                 value, moduleid, data, size, 1000);
1602
1603         if (status == size)
1604                 status = 0;
1605
1606         if (status > 0)
1607                 status = -ECOMM;
1608
1609         return status;
1610 }
1611
1612
1613 static int ti_write_byte(struct ti_device *tdev, unsigned long addr,
1614         __u8 mask, __u8 byte)
1615 {
1616         int status;
1617         unsigned int size;
1618         struct ti_write_data_bytes *data;
1619         struct device *dev = &tdev->td_serial->dev->dev;
1620
1621         dbg("%s - addr 0x%08lX, mask 0x%02X, byte 0x%02X",
1622                                         __func__, addr, mask, byte);
1623
1624         size = sizeof(struct ti_write_data_bytes) + 2;
1625         data = kmalloc(size, GFP_KERNEL);
1626         if (!data) {
1627                 dev_err(dev, "%s - out of memory\n", __func__);
1628                 return -ENOMEM;
1629         }
1630
1631         data->bAddrType = TI_RW_DATA_ADDR_XDATA;
1632         data->bDataType = TI_RW_DATA_BYTE;
1633         data->bDataCounter = 1;
1634         data->wBaseAddrHi = cpu_to_be16(addr>>16);
1635         data->wBaseAddrLo = cpu_to_be16(addr);
1636         data->bData[0] = mask;
1637         data->bData[1] = byte;
1638
1639         status = ti_command_out_sync(tdev, TI_WRITE_DATA, TI_RAM_PORT, 0,
1640                 (__u8 *)data, size);
1641
1642         if (status < 0)
1643                 dev_err(dev, "%s - failed, %d\n", __func__, status);
1644
1645         kfree(data);
1646
1647         return status;
1648 }
1649
1650 static int ti_do_download(struct usb_device *dev, int pipe,
1651                                                 u8 *buffer, int size)
1652 {
1653         int pos;
1654         u8 cs = 0;
1655         int done;
1656         struct ti_firmware_header *header;
1657         int status = 0;
1658         int len;
1659
1660         for (pos = sizeof(struct ti_firmware_header); pos < size; pos++)
1661                 cs = (__u8)(cs + buffer[pos]);
1662
1663         header = (struct ti_firmware_header *)buffer;
1664         header->wLength = cpu_to_le16((__u16)(size
1665                                         - sizeof(struct ti_firmware_header)));
1666         header->bCheckSum = cs;
1667
1668         dbg("%s - downloading firmware", __func__);
1669         for (pos = 0; pos < size; pos += done) {
1670                 len = min(size - pos, TI_DOWNLOAD_MAX_PACKET_SIZE);
1671                 status = usb_bulk_msg(dev, pipe, buffer + pos, len,
1672                                                                 &done, 1000);
1673                 if (status)
1674                         break;
1675         }
1676         return status;
1677 }
1678
1679 static int ti_download_firmware(struct ti_device *tdev)
1680 {
1681         int status;
1682         int buffer_size;
1683         __u8 *buffer;
1684         struct usb_device *dev = tdev->td_serial->dev;
1685         unsigned int pipe = usb_sndbulkpipe(dev,
1686                 tdev->td_serial->port[0]->bulk_out_endpointAddress);
1687         const struct firmware *fw_p;
1688         char buf[32];
1689
1690         /* try ID specific firmware first, then try generic firmware */
1691         sprintf(buf, "ti_usb-v%04x-p%04x.fw", dev->descriptor.idVendor,
1692             dev->descriptor.idProduct);
1693         if ((status = request_firmware(&fw_p, buf, &dev->dev)) != 0) {
1694                 buf[0] = '\0';
1695                 if (dev->descriptor.idVendor == MTS_VENDOR_ID) {
1696                         switch (dev->descriptor.idProduct) {
1697                         case MTS_CDMA_PRODUCT_ID:
1698                                 strcpy(buf, "mts_cdma.fw");
1699                                 break;
1700                         case MTS_GSM_PRODUCT_ID:
1701                                 strcpy(buf, "mts_gsm.fw");
1702                                 break;
1703                         case MTS_EDGE_PRODUCT_ID:
1704                                 strcpy(buf, "mts_edge.fw");
1705                                 break;
1706                         }
1707                 }
1708                 if (buf[0] == '\0') {
1709                         if (tdev->td_is_3410)
1710                                 strcpy(buf, "ti_3410.fw");
1711                         else
1712                                 strcpy(buf, "ti_5052.fw");
1713                 }
1714                 status = request_firmware(&fw_p, buf, &dev->dev);
1715         }
1716         if (status) {
1717                 dev_err(&dev->dev, "%s - firmware not found\n", __func__);
1718                 return -ENOENT;
1719         }
1720         if (fw_p->size > TI_FIRMWARE_BUF_SIZE) {
1721                 dev_err(&dev->dev, "%s - firmware too large\n", __func__);
1722                 return -ENOENT;
1723         }
1724
1725         buffer_size = TI_FIRMWARE_BUF_SIZE + sizeof(struct ti_firmware_header);
1726         buffer = kmalloc(buffer_size, GFP_KERNEL);
1727         if (buffer) {
1728                 memcpy(buffer, fw_p->data, fw_p->size);
1729                 memset(buffer + fw_p->size, 0xff, buffer_size - fw_p->size);
1730                 status = ti_do_download(dev, pipe, buffer, fw_p->size);
1731                 kfree(buffer);
1732         } else {
1733                 status = -ENOMEM;
1734         }
1735         release_firmware(fw_p);
1736         if (status) {
1737                 dev_err(&dev->dev, "%s - error downloading firmware, %d\n",
1738                                                         __func__, status);
1739                 return status;
1740         }
1741
1742         dbg("%s - download successful", __func__);
1743
1744         return 0;
1745 }
1746
1747
1748 /* Circular Buffer Functions */
1749
1750 /*
1751  * ti_buf_alloc
1752  *
1753  * Allocate a circular buffer and all associated memory.
1754  */
1755
1756 static struct circ_buf *ti_buf_alloc(void)
1757 {
1758         struct circ_buf *cb;
1759
1760         cb = kmalloc(sizeof(struct circ_buf), GFP_KERNEL);
1761         if (cb == NULL)
1762                 return NULL;
1763
1764         cb->buf = kmalloc(TI_WRITE_BUF_SIZE, GFP_KERNEL);
1765         if (cb->buf == NULL) {
1766                 kfree(cb);
1767                 return NULL;
1768         }
1769
1770         ti_buf_clear(cb);
1771
1772         return cb;
1773 }
1774
1775
1776 /*
1777  * ti_buf_free
1778  *
1779  * Free the buffer and all associated memory.
1780  */
1781
1782 static void ti_buf_free(struct circ_buf *cb)
1783 {
1784         kfree(cb->buf);
1785         kfree(cb);
1786 }
1787
1788
1789 /*
1790  * ti_buf_clear
1791  *
1792  * Clear out all data in the circular buffer.
1793  */
1794
1795 static void ti_buf_clear(struct circ_buf *cb)
1796 {
1797         cb->head = cb->tail = 0;
1798 }
1799
1800
1801 /*
1802  * ti_buf_data_avail
1803  *
1804  * Return the number of bytes of data available in the circular
1805  * buffer.
1806  */
1807
1808 static int ti_buf_data_avail(struct circ_buf *cb)
1809 {
1810         return CIRC_CNT(cb->head, cb->tail, TI_WRITE_BUF_SIZE);
1811 }
1812
1813
1814 /*
1815  * ti_buf_space_avail
1816  *
1817  * Return the number of bytes of space available in the circular
1818  * buffer.
1819  */
1820
1821 static int ti_buf_space_avail(struct circ_buf *cb)
1822 {
1823         return CIRC_SPACE(cb->head, cb->tail, TI_WRITE_BUF_SIZE);
1824 }
1825
1826
1827 /*
1828  * ti_buf_put
1829  *
1830  * Copy data data from a user buffer and put it into the circular buffer.
1831  * Restrict to the amount of space available.
1832  *
1833  * Return the number of bytes copied.
1834  */
1835
1836 static int ti_buf_put(struct circ_buf *cb, const char *buf, int count)
1837 {
1838         int c, ret = 0;
1839
1840         while (1) {
1841                 c = CIRC_SPACE_TO_END(cb->head, cb->tail, TI_WRITE_BUF_SIZE);
1842                 if (count < c)
1843                         c = count;
1844                 if (c <= 0)
1845                         break;
1846                 memcpy(cb->buf + cb->head, buf, c);
1847                 cb->head = (cb->head + c) & (TI_WRITE_BUF_SIZE-1);
1848                 buf += c;
1849                 count -= c;
1850                 ret += c;
1851         }
1852
1853         return ret;
1854 }
1855
1856
1857 /*
1858  * ti_buf_get
1859  *
1860  * Get data from the circular buffer and copy to the given buffer.
1861  * Restrict to the amount of data available.
1862  *
1863  * Return the number of bytes copied.
1864  */
1865
1866 static int ti_buf_get(struct circ_buf *cb, char *buf, int count)
1867 {
1868         int c, ret = 0;
1869
1870         while (1) {
1871                 c = CIRC_CNT_TO_END(cb->head, cb->tail, TI_WRITE_BUF_SIZE);
1872                 if (count < c)
1873                         c = count;
1874                 if (c <= 0)
1875                         break;
1876                 memcpy(buf, cb->buf + cb->tail, c);
1877                 cb->tail = (cb->tail + c) & (TI_WRITE_BUF_SIZE-1);
1878                 buf += c;
1879                 count -= c;
1880                 ret += c;
1881         }
1882
1883         return ret;
1884 }