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[13+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(MTS_VENDOR_ID, MTS_MT9234MU_PRODUCT_ID) },
 184         { USB_DEVICE(MTS_VENDOR_ID, MTS_MT9234ZBA_PRODUCT_ID) },
 185         { USB_DEVICE(MTS_VENDOR_ID, MTS_MT9234ZBAOLD_PRODUCT_ID) },
 186         { USB_DEVICE(IBM_VENDOR_ID, IBM_4543_PRODUCT_ID) },
 187         { USB_DEVICE(IBM_VENDOR_ID, IBM_454B_PRODUCT_ID) },
 188         { USB_DEVICE(IBM_VENDOR_ID, IBM_454C_PRODUCT_ID) },
 189 };
 190
 191 static struct usb_device_id ti_id_table_5052[5+TI_EXTRA_VID_PID_COUNT+1] = {
 192         { USB_DEVICE(TI_VENDOR_ID, TI_5052_BOOT_PRODUCT_ID) },
 193         { USB_DEVICE(TI_VENDOR_ID, TI_5152_BOOT_PRODUCT_ID) },
 194         { USB_DEVICE(TI_VENDOR_ID, TI_5052_EEPROM_PRODUCT_ID) },
 195         { USB_DEVICE(TI_VENDOR_ID, TI_5052_FIRMWARE_PRODUCT_ID) },
 196 };
 197
 198 static struct usb_device_id ti_id_table_combined[17+2*TI_EXTRA_VID_PID_COUNT+1] = {
 199         { USB_DEVICE(TI_VENDOR_ID, TI_3410_PRODUCT_ID) },
 200         { USB_DEVICE(TI_VENDOR_ID, TI_3410_EZ430_ID) },
 201         { USB_DEVICE(MTS_VENDOR_ID, MTS_GSM_NO_FW_PRODUCT_ID) },
 202         { USB_DEVICE(MTS_VENDOR_ID, MTS_CDMA_NO_FW_PRODUCT_ID) },
 203         { USB_DEVICE(MTS_VENDOR_ID, MTS_CDMA_PRODUCT_ID) },
 204         { USB_DEVICE(MTS_VENDOR_ID, MTS_GSM_PRODUCT_ID) },
 205         { USB_DEVICE(MTS_VENDOR_ID, MTS_EDGE_PRODUCT_ID) },
 206         { USB_DEVICE(MTS_VENDOR_ID, MTS_MT9234MU_PRODUCT_ID) },
 207         { USB_DEVICE(MTS_VENDOR_ID, MTS_MT9234ZBA_PRODUCT_ID) },
 208         { USB_DEVICE(MTS_VENDOR_ID, MTS_MT9234ZBAOLD_PRODUCT_ID) },
 209         { USB_DEVICE(TI_VENDOR_ID, TI_5052_BOOT_PRODUCT_ID) },
 210         { USB_DEVICE(TI_VENDOR_ID, TI_5152_BOOT_PRODUCT_ID) },
 211         { USB_DEVICE(TI_VENDOR_ID, TI_5052_EEPROM_PRODUCT_ID) },
 212         { USB_DEVICE(TI_VENDOR_ID, TI_5052_FIRMWARE_PRODUCT_ID) },
 213         { USB_DEVICE(IBM_VENDOR_ID, IBM_4543_PRODUCT_ID) },
 214         { USB_DEVICE(IBM_VENDOR_ID, IBM_454B_PRODUCT_ID) },
 215         { USB_DEVICE(IBM_VENDOR_ID, IBM_454C_PRODUCT_ID) },
 216         { }
 217 };
 218
 219 static struct usb_driver ti_usb_driver = {
 220         .name                   = "ti_usb_3410_5052",
 221         .probe                  = usb_serial_probe,
 222         .disconnect             = usb_serial_disconnect,
 223         .id_table               = ti_id_table_combined,
 224         .no_dynamic_id =        1,
 225 };
 226
 227 static struct usb_serial_driver ti_1port_device = {
 228         .driver = {
 229                 .owner          = THIS_MODULE,
 230                 .name           = "ti_usb_3410_5052_1",
 231         },
 232         .description            = "TI USB 3410 1 port adapter",
 233         .usb_driver             = &ti_usb_driver,
 234         .id_table               = ti_id_table_3410,
 235         .num_ports              = 1,
 236         .attach                 = ti_startup,
 237         .release                = ti_release,
 238         .open                   = ti_open,
 239         .close                  = ti_close,
 240         .write                  = ti_write,
 241         .write_room             = ti_write_room,
 242         .chars_in_buffer        = ti_chars_in_buffer,
 243         .throttle               = ti_throttle,
 244         .unthrottle             = ti_unthrottle,
 245         .ioctl                  = ti_ioctl,
 246         .set_termios            = ti_set_termios,
 247         .tiocmget               = ti_tiocmget,
 248         .tiocmset               = ti_tiocmset,
 249         .break_ctl              = ti_break,
 250         .read_int_callback      = ti_interrupt_callback,
 251         .read_bulk_callback     = ti_bulk_in_callback,
 252         .write_bulk_callback    = ti_bulk_out_callback,
 253 };
 254
 255 static struct usb_serial_driver ti_2port_device = {
 256         .driver = {
 257                 .owner          = THIS_MODULE,
 258                 .name           = "ti_usb_3410_5052_2",
 259         },
 260         .description            = "TI USB 5052 2 port adapter",
 261         .usb_driver             = &ti_usb_driver,
 262         .id_table               = ti_id_table_5052,
 263         .num_ports              = 2,
 264         .attach                 = ti_startup,
 265         .release                = ti_release,
 266         .open                   = ti_open,
 267         .close                  = ti_close,
 268         .write                  = ti_write,
 269         .write_room             = ti_write_room,
 270         .chars_in_buffer        = ti_chars_in_buffer,
 271         .throttle               = ti_throttle,
 272         .unthrottle             = ti_unthrottle,
 273         .ioctl                  = ti_ioctl,
 274         .set_termios            = ti_set_termios,
 275         .tiocmget               = ti_tiocmget,
 276         .tiocmset               = ti_tiocmset,
 277         .break_ctl              = ti_break,
 278         .read_int_callback      = ti_interrupt_callback,
 279         .read_bulk_callback     = ti_bulk_in_callback,
 280         .write_bulk_callback    = ti_bulk_out_callback,
 281 };
 282
 283
 284 /* Module */
 285
 286 MODULE_AUTHOR(TI_DRIVER_AUTHOR);
 287 MODULE_DESCRIPTION(TI_DRIVER_DESC);
 288 MODULE_VERSION(TI_DRIVER_VERSION);
 289 MODULE_LICENSE("GPL");
 290
 291 MODULE_FIRMWARE("ti_3410.fw");
 292 MODULE_FIRMWARE("ti_5052.fw");
 293 MODULE_FIRMWARE("mts_cdma.fw");
 294 MODULE_FIRMWARE("mts_gsm.fw");
 295 MODULE_FIRMWARE("mts_edge.fw");
 296 MODULE_FIRMWARE("mts_mt9234mu.fw");
 297 MODULE_FIRMWARE("mts_mt9234zba.fw");
 298
 299 module_param(debug, bool, S_IRUGO | S_IWUSR);
 300 MODULE_PARM_DESC(debug, "Enable debugging, 0=no, 1=yes");
 301
 302 module_param(closing_wait, int, S_IRUGO | S_IWUSR);
 303 MODULE_PARM_DESC(closing_wait,
 304     "Maximum wait for data to drain in close, in .01 secs, default is 4000");
 305
 306 module_param_array(vendor_3410, ushort, &vendor_3410_count, S_IRUGO);
 307 MODULE_PARM_DESC(vendor_3410,
 308                 "Vendor ids for 3410 based devices, 1-5 short integers");
 309 module_param_array(product_3410, ushort, &product_3410_count, S_IRUGO);
 310 MODULE_PARM_DESC(product_3410,
 311                 "Product ids for 3410 based devices, 1-5 short integers");
 312 module_param_array(vendor_5052, ushort, &vendor_5052_count, S_IRUGO);
 313 MODULE_PARM_DESC(vendor_5052,
 314                 "Vendor ids for 5052 based devices, 1-5 short integers");
 315 module_param_array(product_5052, ushort, &product_5052_count, S_IRUGO);
 316 MODULE_PARM_DESC(product_5052,
 317                 "Product ids for 5052 based devices, 1-5 short integers");
 318
 319 MODULE_DEVICE_TABLE(usb, ti_id_table_combined);
 320
 321
 322 /* Functions */
 323
 324 static int __init ti_init(void)
 325 {
 326         int i, j, c;
 327         int ret;
 328
 329         /* insert extra vendor and product ids */
 330         c = ARRAY_SIZE(ti_id_table_combined) - 2 * TI_EXTRA_VID_PID_COUNT - 1;
 331         j = ARRAY_SIZE(ti_id_table_3410) - TI_EXTRA_VID_PID_COUNT - 1;
 332         for (i = 0; i < min(vendor_3410_count, product_3410_count); i++, j++, c++) {
 333                 ti_id_table_3410[j].idVendor = vendor_3410[i];
 334                 ti_id_table_3410[j].idProduct = product_3410[i];
 335                 ti_id_table_3410[j].match_flags = USB_DEVICE_ID_MATCH_DEVICE;
 336                 ti_id_table_combined[c].idVendor = vendor_3410[i];
 337                 ti_id_table_combined[c].idProduct = product_3410[i];
 338                 ti_id_table_combined[c].match_flags = USB_DEVICE_ID_MATCH_DEVICE;
 339         }
 340         j = ARRAY_SIZE(ti_id_table_5052) - TI_EXTRA_VID_PID_COUNT - 1;
 341         for (i = 0; i < min(vendor_5052_count, product_5052_count); i++, j++, c++) {
 342                 ti_id_table_5052[j].idVendor = vendor_5052[i];
 343                 ti_id_table_5052[j].idProduct = product_5052[i];
 344                 ti_id_table_5052[j].match_flags = USB_DEVICE_ID_MATCH_DEVICE;
 345                 ti_id_table_combined[c].idVendor = vendor_5052[i];
 346                 ti_id_table_combined[c].idProduct = product_5052[i];
 347                 ti_id_table_combined[c].match_flags = USB_DEVICE_ID_MATCH_DEVICE;
 348         }
 349
 350         ret = usb_serial_register(&ti_1port_device);
 351         if (ret)
 352                 goto failed_1port;
 353         ret = usb_serial_register(&ti_2port_device);
 354         if (ret)
 355                 goto failed_2port;
 356
 357         ret = usb_register(&ti_usb_driver);
 358         if (ret)
 359                 goto failed_usb;
 360
 361         printk(KERN_INFO KBUILD_MODNAME ": " TI_DRIVER_VERSION ":"
 362                TI_DRIVER_DESC "\n");
 363
 364         return 0;
 365
 366 failed_usb:
 367         usb_serial_deregister(&ti_2port_device);
 368 failed_2port:
 369         usb_serial_deregister(&ti_1port_device);
 370 failed_1port:
 371         return ret;
 372 }
 373
 374
 375 static void __exit ti_exit(void)
 376 {
 377         usb_serial_deregister(&ti_1port_device);
 378         usb_serial_deregister(&ti_2port_device);
 379         usb_deregister(&ti_usb_driver);
 380 }
 381
 382
 383 module_init(ti_init);
 384 module_exit(ti_exit);
 385
 386
 387 static int ti_startup(struct usb_serial *serial)
 388 {
 389         struct ti_device *tdev;
 390         struct ti_port *tport;
 391         struct usb_device *dev = serial->dev;
 392         int status;
 393         int i;
 394
 395
 396         dbg("%s - product 0x%4X, num configurations %d, configuration value %d",
 397             __func__, le16_to_cpu(dev->descriptor.idProduct),
 398             dev->descriptor.bNumConfigurations,
 399             dev->actconfig->desc.bConfigurationValue);
 400
 401         /* create device structure */
 402         tdev = kzalloc(sizeof(struct ti_device), GFP_KERNEL);
 403         if (tdev == NULL) {
 404                 dev_err(&dev->dev, "%s - out of memory\n", __func__);
 405                 return -ENOMEM;
 406         }
 407         mutex_init(&tdev->td_open_close_lock);
 408         tdev->td_serial = serial;
 409         usb_set_serial_data(serial, tdev);
 410
 411         /* determine device type */
 412         if (usb_match_id(serial->interface, ti_id_table_3410))
 413                 tdev->td_is_3410 = 1;
 414         dbg("%s - device type is %s", __func__,
 415                                 tdev->td_is_3410 ? "3410" : "5052");
 416
 417         /* if we have only 1 configuration, download firmware */
 418         if (dev->descriptor.bNumConfigurations == 1) {
 419                 if ((status = ti_download_firmware(tdev)) != 0)
 420                         goto free_tdev;
 421
 422                 /* 3410 must be reset, 5052 resets itself */
 423                 if (tdev->td_is_3410) {
 424                         msleep_interruptible(100);
 425                         usb_reset_device(dev);
 426                 }
 427
 428                 status = -ENODEV;
 429                 goto free_tdev;
 430         }
 431
 432         /* the second configuration must be set */
 433         if (dev->actconfig->desc.bConfigurationValue == TI_BOOT_CONFIG) {
 434                 status = usb_driver_set_configuration(dev, TI_ACTIVE_CONFIG);
 435                 status = status ? status : -ENODEV;
 436                 goto free_tdev;
 437         }
 438
 439         /* set up port structures */
 440         for (i = 0; i < serial->num_ports; ++i) {
 441                 tport = kzalloc(sizeof(struct ti_port), GFP_KERNEL);
 442                 if (tport == NULL) {
 443                         dev_err(&dev->dev, "%s - out of memory\n", __func__);
 444                         status = -ENOMEM;
 445                         goto free_tports;
 446                 }
 447                 spin_lock_init(&tport->tp_lock);
 448                 tport->tp_uart_base_addr = (i == 0 ?
 449                                 TI_UART1_BASE_ADDR : TI_UART2_BASE_ADDR);
 450                 tport->tp_closing_wait = closing_wait;
 451                 init_waitqueue_head(&tport->tp_msr_wait);
 452                 init_waitqueue_head(&tport->tp_write_wait);
 453                 tport->tp_write_buf = ti_buf_alloc();
 454                 if (tport->tp_write_buf == NULL) {
 455                         dev_err(&dev->dev, "%s - out of memory\n", __func__);
 456                         kfree(tport);
 457                         status = -ENOMEM;
 458                         goto free_tports;
 459                 }
 460                 tport->tp_port = serial->port[i];
 461                 tport->tp_tdev = tdev;
 462                 usb_set_serial_port_data(serial->port[i], tport);
 463                 tport->tp_uart_mode = 0;        /* default is RS232 */
 464         }
 465
 466         return 0;
 467
 468 free_tports:
 469         for (--i; i >= 0; --i) {
 470                 tport = usb_get_serial_port_data(serial->port[i]);
 471                 ti_buf_free(tport->tp_write_buf);
 472                 kfree(tport);
 473                 usb_set_serial_port_data(serial->port[i], NULL);
 474         }
 475 free_tdev:
 476         kfree(tdev);
 477         usb_set_serial_data(serial, NULL);
 478         return status;
 479 }
 480
 481
 482 static void ti_release(struct usb_serial *serial)
 483 {
 484         int i;
 485         struct ti_device *tdev = usb_get_serial_data(serial);
 486         struct ti_port *tport;
 487
 488         dbg("%s", __func__);
 489
 490         for (i = 0; i < serial->num_ports; ++i) {
 491                 tport = usb_get_serial_port_data(serial->port[i]);
 492                 if (tport) {
 493                         ti_buf_free(tport->tp_write_buf);
 494                         kfree(tport);
 495                 }
 496         }
 497
 498         kfree(tdev);
 499 }
 500
 501
 502 static int ti_open(struct tty_struct *tty, struct usb_serial_port *port)
 503 {
 504         struct ti_port *tport = usb_get_serial_port_data(port);
 505         struct ti_device *tdev;
 506         struct usb_device *dev;
 507         struct urb *urb;
 508         int port_number;
 509         int status;
 510         __u16 open_settings = (__u8)(TI_PIPE_MODE_CONTINOUS |
 511                              TI_PIPE_TIMEOUT_ENABLE |
 512                              (TI_TRANSFER_TIMEOUT << 2));
 513
 514         dbg("%s - port %d", __func__, port->number);
 515
 516         if (tport == NULL)
 517                 return -ENODEV;
 518
 519         dev = port->serial->dev;
 520         tdev = tport->tp_tdev;
 521
 522         /* only one open on any port on a device at a time */
 523         if (mutex_lock_interruptible(&tdev->td_open_close_lock))
 524                 return -ERESTARTSYS;
 525
 526         port_number = port->number - port->serial->minor;
 527
 528         memset(&(tport->tp_icount), 0x00, sizeof(tport->tp_icount));
 529
 530         tport->tp_msr = 0;
 531         tport->tp_shadow_mcr |= (TI_MCR_RTS | TI_MCR_DTR);
 532
 533         /* start interrupt urb the first time a port is opened on this device */
 534         if (tdev->td_open_port_count == 0) {
 535                 dbg("%s - start interrupt in urb", __func__);
 536                 urb = tdev->td_serial->port[0]->interrupt_in_urb;
 537                 if (!urb) {
 538                         dev_err(&port->dev, "%s - no interrupt urb\n",
 539                                                                 __func__);
 540                         status = -EINVAL;
 541                         goto release_lock;
 542                 }
 543                 urb->complete = ti_interrupt_callback;
 544                 urb->context = tdev;
 545                 urb->dev = dev;
 546                 status = usb_submit_urb(urb, GFP_KERNEL);
 547                 if (status) {
 548                         dev_err(&port->dev,
 549                                 "%s - submit interrupt urb failed, %d\n",
 550                                         __func__, status);
 551                         goto release_lock;
 552                 }
 553         }
 554
 555         if (tty)
 556                 ti_set_termios(tty, port, tty->termios);
 557
 558         dbg("%s - sending TI_OPEN_PORT", __func__);
 559         status = ti_command_out_sync(tdev, TI_OPEN_PORT,
 560                 (__u8)(TI_UART1_PORT + port_number), open_settings, NULL, 0);
 561         if (status) {
 562                 dev_err(&port->dev, "%s - cannot send open command, %d\n",
 563                                                         __func__, status);
 564                 goto unlink_int_urb;
 565         }
 566
 567         dbg("%s - sending TI_START_PORT", __func__);
 568         status = ti_command_out_sync(tdev, TI_START_PORT,
 569                 (__u8)(TI_UART1_PORT + port_number), 0, NULL, 0);
 570         if (status) {
 571                 dev_err(&port->dev, "%s - cannot send start command, %d\n",
 572                                                         __func__, status);
 573                 goto unlink_int_urb;
 574         }
 575
 576         dbg("%s - sending TI_PURGE_PORT", __func__);
 577         status = ti_command_out_sync(tdev, TI_PURGE_PORT,
 578                 (__u8)(TI_UART1_PORT + port_number), TI_PURGE_INPUT, NULL, 0);
 579         if (status) {
 580                 dev_err(&port->dev, "%s - cannot clear input buffers, %d\n",
 581                                                         __func__, status);
 582                 goto unlink_int_urb;
 583         }
 584         status = ti_command_out_sync(tdev, TI_PURGE_PORT,
 585                 (__u8)(TI_UART1_PORT + port_number), TI_PURGE_OUTPUT, NULL, 0);
 586         if (status) {
 587                 dev_err(&port->dev, "%s - cannot clear output buffers, %d\n",
 588                                                         __func__, status);
 589                 goto unlink_int_urb;
 590         }
 591
 592         /* reset the data toggle on the bulk endpoints to work around bug in
 593          * host controllers where things get out of sync some times */
 594         usb_clear_halt(dev, port->write_urb->pipe);
 595         usb_clear_halt(dev, port->read_urb->pipe);
 596
 597         if (tty)
 598                 ti_set_termios(tty, port, tty->termios);
 599
 600         dbg("%s - sending TI_OPEN_PORT (2)", __func__);
 601         status = ti_command_out_sync(tdev, TI_OPEN_PORT,
 602                 (__u8)(TI_UART1_PORT + port_number), open_settings, NULL, 0);
 603         if (status) {
 604                 dev_err(&port->dev, "%s - cannot send open command (2), %d\n",
 605                                                         __func__, status);
 606                 goto unlink_int_urb;
 607         }
 608
 609         dbg("%s - sending TI_START_PORT (2)", __func__);
 610         status = ti_command_out_sync(tdev, TI_START_PORT,
 611                 (__u8)(TI_UART1_PORT + port_number), 0, NULL, 0);
 612         if (status) {
 613                 dev_err(&port->dev, "%s - cannot send start command (2), %d\n",
 614                                                         __func__, status);
 615                 goto unlink_int_urb;
 616         }
 617
 618         /* start read urb */
 619         dbg("%s - start read urb", __func__);
 620         urb = port->read_urb;
 621         if (!urb) {
 622                 dev_err(&port->dev, "%s - no read urb\n", __func__);
 623                 status = -EINVAL;
 624                 goto unlink_int_urb;
 625         }
 626         tport->tp_read_urb_state = TI_READ_URB_RUNNING;
 627         urb->complete = ti_bulk_in_callback;
 628         urb->context = tport;
 629         urb->dev = dev;
 630         status = usb_submit_urb(urb, GFP_KERNEL);
 631         if (status) {
 632                 dev_err(&port->dev, "%s - submit read urb failed, %d\n",
 633                                                         __func__, status);
 634                 goto unlink_int_urb;
 635         }
 636
 637         tport->tp_is_open = 1;
 638         ++tdev->td_open_port_count;
 639
 640         goto release_lock;
 641
 642 unlink_int_urb:
 643         if (tdev->td_open_port_count == 0)
 644                 usb_kill_urb(port->serial->port[0]->interrupt_in_urb);
 645 release_lock:
 646         mutex_unlock(&tdev->td_open_close_lock);
 647         dbg("%s - exit %d", __func__, status);
 648         return status;
 649 }
 650
 651
 652 static void ti_close(struct usb_serial_port *port)
 653 {
 654         struct ti_device *tdev;
 655         struct ti_port *tport;
 656         int port_number;
 657         int status;
 658         int do_unlock;
 659
 660         dbg("%s - port %d", __func__, port->number);
 661
 662         tdev = usb_get_serial_data(port->serial);
 663         tport = usb_get_serial_port_data(port);
 664         if (tdev == NULL || tport == NULL)
 665                 return;
 666
 667         tport->tp_is_open = 0;
 668
 669         ti_drain(tport, (tport->tp_closing_wait*HZ)/100, 1);
 670
 671         usb_kill_urb(port->read_urb);
 672         usb_kill_urb(port->write_urb);
 673         tport->tp_write_urb_in_use = 0;
 674
 675         port_number = port->number - port->serial->minor;
 676
 677         dbg("%s - sending TI_CLOSE_PORT", __func__);
 678         status = ti_command_out_sync(tdev, TI_CLOSE_PORT,
 679                      (__u8)(TI_UART1_PORT + port_number), 0, NULL, 0);
 680         if (status)
 681                 dev_err(&port->dev,
 682                         "%s - cannot send close port command, %d\n"
 683                                                         , __func__, status);
 684
 685         /* if mutex_lock is interrupted, continue anyway */
 686         do_unlock = !mutex_lock_interruptible(&tdev->td_open_close_lock);
 687         --tport->tp_tdev->td_open_port_count;
 688         if (tport->tp_tdev->td_open_port_count <= 0) {
 689                 /* last port is closed, shut down interrupt urb */
 690                 usb_kill_urb(port->serial->port[0]->interrupt_in_urb);
 691                 tport->tp_tdev->td_open_port_count = 0;
 692         }
 693         if (do_unlock)
 694                 mutex_unlock(&tdev->td_open_close_lock);
 695
 696         dbg("%s - exit", __func__);
 697 }
 698
 699
 700 static int ti_write(struct tty_struct *tty, struct usb_serial_port *port,
 701                         const unsigned char *data, int count)
 702 {
 703         struct ti_port *tport = usb_get_serial_port_data(port);
 704         unsigned long flags;
 705
 706         dbg("%s - port %d", __func__, port->number);
 707
 708         if (count == 0) {
 709                 dbg("%s - write request of 0 bytes", __func__);
 710                 return 0;
 711         }
 712
 713         if (tport == NULL || !tport->tp_is_open)
 714                 return -ENODEV;
 715
 716         spin_lock_irqsave(&tport->tp_lock, flags);
 717         count = ti_buf_put(tport->tp_write_buf, data, count);
 718         spin_unlock_irqrestore(&tport->tp_lock, flags);
 719
 720         ti_send(tport);
 721
 722         return count;
 723 }
 724
 725
 726 static int ti_write_room(struct tty_struct *tty)
 727 {
 728         struct usb_serial_port *port = tty->driver_data;
 729         struct ti_port *tport = usb_get_serial_port_data(port);
 730         int room = 0;
 731         unsigned long flags;
 732
 733         dbg("%s - port %d", __func__, port->number);
 734
 735         if (tport == NULL)
 736                 return 0;
 737
 738         spin_lock_irqsave(&tport->tp_lock, flags);
 739         room = ti_buf_space_avail(tport->tp_write_buf);
 740         spin_unlock_irqrestore(&tport->tp_lock, flags);
 741
 742         dbg("%s - returns %d", __func__, room);
 743         return room;
 744 }
 745
 746
 747 static int ti_chars_in_buffer(struct tty_struct *tty)
 748 {
 749         struct usb_serial_port *port = tty->driver_data;
 750         struct ti_port *tport = usb_get_serial_port_data(port);
 751         int chars = 0;
 752         unsigned long flags;
 753
 754         dbg("%s - port %d", __func__, port->number);
 755
 756         if (tport == NULL)
 757                 return 0;
 758
 759         spin_lock_irqsave(&tport->tp_lock, flags);
 760         chars = ti_buf_data_avail(tport->tp_write_buf);
 761         spin_unlock_irqrestore(&tport->tp_lock, flags);
 762
 763         dbg("%s - returns %d", __func__, chars);
 764         return chars;
 765 }
 766
 767
 768 static void ti_throttle(struct tty_struct *tty)
 769 {
 770         struct usb_serial_port *port = tty->driver_data;
 771         struct ti_port *tport = usb_get_serial_port_data(port);
 772
 773         dbg("%s - port %d", __func__, port->number);
 774
 775         if (tport == NULL)
 776                 return;
 777
 778         if (I_IXOFF(tty) || C_CRTSCTS(tty))
 779                 ti_stop_read(tport, tty);
 780
 781 }
 782
 783
 784 static void ti_unthrottle(struct tty_struct *tty)
 785 {
 786         struct usb_serial_port *port = tty->driver_data;
 787         struct ti_port *tport = usb_get_serial_port_data(port);
 788         int status;
 789
 790         dbg("%s - port %d", __func__, port->number);
 791
 792         if (tport == NULL)
 793                 return;
 794
 795         if (I_IXOFF(tty) || C_CRTSCTS(tty)) {
 796                 status = ti_restart_read(tport, tty);
 797                 if (status)
 798                         dev_err(&port->dev, "%s - cannot restart read, %d\n",
 799                                                         __func__, status);
 800         }
 801 }
 802
 803
 804 static int ti_ioctl(struct tty_struct *tty, struct file *file,
 805         unsigned int cmd, unsigned long arg)
 806 {
 807         struct usb_serial_port *port = tty->driver_data;
 808         struct ti_port *tport = usb_get_serial_port_data(port);
 809         struct async_icount cnow;
 810         struct async_icount cprev;
 811
 812         dbg("%s - port %d, cmd = 0x%04X", __func__, port->number, cmd);
 813
 814         if (tport == NULL)
 815                 return -ENODEV;
 816
 817         switch (cmd) {
 818         case TIOCGSERIAL:
 819                 dbg("%s - (%d) TIOCGSERIAL", __func__, port->number);
 820                 return ti_get_serial_info(tport,
 821                                 (struct serial_struct __user *)arg);
 822         case TIOCSSERIAL:
 823                 dbg("%s - (%d) TIOCSSERIAL", __func__, port->number);
 824                 return ti_set_serial_info(tty, tport,
 825                                 (struct serial_struct __user *)arg);
 826         case TIOCMIWAIT:
 827                 dbg("%s - (%d) TIOCMIWAIT", __func__, port->number);
 828                 cprev = tport->tp_icount;
 829                 while (1) {
 830                         interruptible_sleep_on(&tport->tp_msr_wait);
 831                         if (signal_pending(current))
 832                                 return -ERESTARTSYS;
 833                         cnow = tport->tp_icount;
 834                         if (cnow.rng == cprev.rng && cnow.dsr == cprev.dsr &&
 835                             cnow.dcd == cprev.dcd && cnow.cts == cprev.cts)
 836                                 return -EIO; /* no change => error */
 837                         if (((arg & TIOCM_RNG) && (cnow.rng != cprev.rng)) ||
 838                             ((arg & TIOCM_DSR) && (cnow.dsr != cprev.dsr)) ||
 839                             ((arg & TIOCM_CD)  && (cnow.dcd != cprev.dcd)) ||
 840                             ((arg & TIOCM_CTS) && (cnow.cts != cprev.cts)))
 841                                 return 0;
 842                         cprev = cnow;
 843                 }
 844                 break;
 845         case TIOCGICOUNT:
 846                 dbg("%s - (%d) TIOCGICOUNT RX=%d, TX=%d",
 847                                 __func__, port->number,
 848                                 tport->tp_icount.rx, tport->tp_icount.tx);
 849                 if (copy_to_user((void __user *)arg, &tport->tp_icount,
 850                                         sizeof(tport->tp_icount)))
 851                         return -EFAULT;
 852                 return 0;
 853         }
 854         return -ENOIOCTLCMD;
 855 }
 856
 857
 858 static void ti_set_termios(struct tty_struct *tty,
 859                 struct usb_serial_port *port, struct ktermios *old_termios)
 860 {
 861         struct ti_port *tport = usb_get_serial_port_data(port);
 862         struct ti_uart_config *config;
 863         tcflag_t cflag, iflag;
 864         int baud;
 865         int status;
 866         int port_number = port->number - port->serial->minor;
 867         unsigned int mcr;
 868
 869         dbg("%s - port %d", __func__, port->number);
 870
 871         cflag = tty->termios->c_cflag;
 872         iflag = tty->termios->c_iflag;
 873
 874         dbg("%s - cflag %08x, iflag %08x", __func__, cflag, iflag);
 875         dbg("%s - old clfag %08x, old iflag %08x", __func__,
 876                                 old_termios->c_cflag, old_termios->c_iflag);
 877
 878         if (tport == NULL)
 879                 return;
 880
 881         config = kmalloc(sizeof(*config), GFP_KERNEL);
 882         if (!config) {
 883                 dev_err(&port->dev, "%s - out of memory\n", __func__);
 884                 return;
 885         }
 886
 887         config->wFlags = 0;
 888
 889         /* these flags must be set */
 890         config->wFlags |= TI_UART_ENABLE_MS_INTS;
 891         config->wFlags |= TI_UART_ENABLE_AUTO_START_DMA;
 892         config->bUartMode = (__u8)(tport->tp_uart_mode);
 893
 894         switch (cflag & CSIZE) {
 895         case CS5:
 896                     config->bDataBits = TI_UART_5_DATA_BITS;
 897                     break;
 898         case CS6:
 899                     config->bDataBits = TI_UART_6_DATA_BITS;
 900                     break;
 901         case CS7:
 902                     config->bDataBits = TI_UART_7_DATA_BITS;
 903                     break;
 904         default:
 905         case CS8:
 906                     config->bDataBits = TI_UART_8_DATA_BITS;
 907                     break;
 908         }
 909
 910         /* CMSPAR isn't supported by this driver */
 911         tty->termios->c_cflag &= ~CMSPAR;
 912
 913         if (cflag & PARENB) {
 914                 if (cflag & PARODD) {
 915                         config->wFlags |= TI_UART_ENABLE_PARITY_CHECKING;
 916                         config->bParity = TI_UART_ODD_PARITY;
 917                 } else {
 918                         config->wFlags |= TI_UART_ENABLE_PARITY_CHECKING;
 919                         config->bParity = TI_UART_EVEN_PARITY;
 920                 }
 921         } else {
 922                 config->wFlags &= ~TI_UART_ENABLE_PARITY_CHECKING;
 923                 config->bParity = TI_UART_NO_PARITY;
 924         }
 925
 926         if (cflag & CSTOPB)
 927                 config->bStopBits = TI_UART_2_STOP_BITS;
 928         else
 929                 config->bStopBits = TI_UART_1_STOP_BITS;
 930
 931         if (cflag & CRTSCTS) {
 932                 /* RTS flow control must be off to drop RTS for baud rate B0 */
 933                 if ((cflag & CBAUD) != B0)
 934                         config->wFlags |= TI_UART_ENABLE_RTS_IN;
 935                 config->wFlags |= TI_UART_ENABLE_CTS_OUT;
 936         } else {
 937                 tty->hw_stopped = 0;
 938                 ti_restart_read(tport, tty);
 939         }
 940
 941         if (I_IXOFF(tty) || I_IXON(tty)) {
 942                 config->cXon  = START_CHAR(tty);
 943                 config->cXoff = STOP_CHAR(tty);
 944
 945                 if (I_IXOFF(tty))
 946                         config->wFlags |= TI_UART_ENABLE_X_IN;
 947                 else
 948                         ti_restart_read(tport, tty);
 949
 950                 if (I_IXON(tty))
 951                         config->wFlags |= TI_UART_ENABLE_X_OUT;
 952         }
 953
 954         baud = tty_get_baud_rate(tty);
 955         if (!baud)
 956                 baud = 9600;
 957         if (tport->tp_tdev->td_is_3410)
 958                 config->wBaudRate = (__u16)((923077 + baud/2) / baud);
 959         else
 960                 config->wBaudRate = (__u16)((461538 + baud/2) / baud);
 961
 962         /* FIXME: Should calculate resulting baud here and report it back */
 963         if ((cflag & CBAUD) != B0)
 964                 tty_encode_baud_rate(tty, baud, baud);
 965
 966         dbg("%s - BaudRate=%d, wBaudRate=%d, wFlags=0x%04X, bDataBits=%d, bParity=%d, bStopBits=%d, cXon=%d, cXoff=%d, bUartMode=%d",
 967         __func__, baud, config->wBaudRate, config->wFlags, config->bDataBits, config->bParity, config->bStopBits, config->cXon, config->cXoff, config->bUartMode);
 968
 969         cpu_to_be16s(&config->wBaudRate);
 970         cpu_to_be16s(&config->wFlags);
 971
 972         status = ti_command_out_sync(tport->tp_tdev, TI_SET_CONFIG,
 973                 (__u8)(TI_UART1_PORT + port_number), 0, (__u8 *)config,
 974                 sizeof(*config));
 975         if (status)
 976                 dev_err(&port->dev, "%s - cannot set config on port %d, %d\n",
 977                                         __func__, port_number, status);
 978
 979         /* SET_CONFIG asserts RTS and DTR, reset them correctly */
 980         mcr = tport->tp_shadow_mcr;
 981         /* if baud rate is B0, clear RTS and DTR */
 982         if ((cflag & CBAUD) == B0)
 983                 mcr &= ~(TI_MCR_DTR | TI_MCR_RTS);
 984         status = ti_set_mcr(tport, mcr);
 985         if (status)
 986                 dev_err(&port->dev,
 987                         "%s - cannot set modem control on port %d, %d\n",
 988                                                 __func__, port_number, status);
 989
 990         kfree(config);
 991 }
 992
 993
 994 static int ti_tiocmget(struct tty_struct *tty, struct file *file)
 995 {
 996         struct usb_serial_port *port = tty->driver_data;
 997         struct ti_port *tport = usb_get_serial_port_data(port);
 998         unsigned int result;
 999         unsigned int msr;
1000         unsigned int mcr;
1001         unsigned long flags;
1002
1003         dbg("%s - port %d", __func__, port->number);
1004
1005         if (tport == NULL)
1006                 return -ENODEV;
1007
1008         spin_lock_irqsave(&tport->tp_lock, flags);
1009         msr = tport->tp_msr;
1010         mcr = tport->tp_shadow_mcr;
1011         spin_unlock_irqrestore(&tport->tp_lock, flags);
1012
1013         result = ((mcr & TI_MCR_DTR) ? TIOCM_DTR : 0)
1014                 | ((mcr & TI_MCR_RTS) ? TIOCM_RTS : 0)
1015                 | ((mcr & TI_MCR_LOOP) ? TIOCM_LOOP : 0)
1016                 | ((msr & TI_MSR_CTS) ? TIOCM_CTS : 0)
1017                 | ((msr & TI_MSR_CD) ? TIOCM_CAR : 0)
1018                 | ((msr & TI_MSR_RI) ? TIOCM_RI : 0)
1019                 | ((msr & TI_MSR_DSR) ? TIOCM_DSR : 0);
1020
1021         dbg("%s - 0x%04X", __func__, result);
1022
1023         return result;
1024 }
1025
1026
1027 static int ti_tiocmset(struct tty_struct *tty, struct file *file,
1028         unsigned int set, unsigned int clear)
1029 {
1030         struct usb_serial_port *port = tty->driver_data;
1031         struct ti_port *tport = usb_get_serial_port_data(port);
1032         unsigned int mcr;
1033         unsigned long flags;
1034
1035         dbg("%s - port %d", __func__, port->number);
1036
1037         if (tport == NULL)
1038                 return -ENODEV;
1039
1040         spin_lock_irqsave(&tport->tp_lock, flags);
1041         mcr = tport->tp_shadow_mcr;
1042
1043         if (set & TIOCM_RTS)
1044                 mcr |= TI_MCR_RTS;
1045         if (set & TIOCM_DTR)
1046                 mcr |= TI_MCR_DTR;
1047         if (set & TIOCM_LOOP)
1048                 mcr |= TI_MCR_LOOP;
1049
1050         if (clear & TIOCM_RTS)
1051                 mcr &= ~TI_MCR_RTS;
1052         if (clear & TIOCM_DTR)
1053                 mcr &= ~TI_MCR_DTR;
1054         if (clear & TIOCM_LOOP)
1055                 mcr &= ~TI_MCR_LOOP;
1056         spin_unlock_irqrestore(&tport->tp_lock, flags);
1057
1058         return ti_set_mcr(tport, mcr);
1059 }
1060
1061
1062 static void ti_break(struct tty_struct *tty, int break_state)
1063 {
1064         struct usb_serial_port *port = tty->driver_data;
1065         struct ti_port *tport = usb_get_serial_port_data(port);
1066         int status;
1067
1068         dbg("%s - state = %d", __func__, break_state);
1069
1070         if (tport == NULL)
1071                 return;
1072
1073         ti_drain(tport, (tport->tp_closing_wait*HZ)/100, 0);
1074
1075         status = ti_write_byte(tport->tp_tdev,
1076                 tport->tp_uart_base_addr + TI_UART_OFFSET_LCR,
1077                 TI_LCR_BREAK, break_state == -1 ? TI_LCR_BREAK : 0);
1078
1079         if (status)
1080                 dbg("%s - error setting break, %d", __func__, status);
1081 }
1082
1083
1084 static void ti_interrupt_callback(struct urb *urb)
1085 {
1086         struct ti_device *tdev = urb->context;
1087         struct usb_serial_port *port;
1088         struct usb_serial *serial = tdev->td_serial;
1089         struct ti_port *tport;
1090         struct device *dev = &urb->dev->dev;
1091         unsigned char *data = urb->transfer_buffer;
1092         int length = urb->actual_length;
1093         int port_number;
1094         int function;
1095         int status = urb->status;
1096         int retval;
1097         __u8 msr;
1098
1099         dbg("%s", __func__);
1100
1101         switch (status) {
1102         case 0:
1103                 break;
1104         case -ECONNRESET:
1105         case -ENOENT:
1106         case -ESHUTDOWN:
1107                 dbg("%s - urb shutting down, %d", __func__, status);
1108                 tdev->td_urb_error = 1;
1109                 return;
1110         default:
1111                 dev_err(dev, "%s - nonzero urb status, %d\n",
1112                         __func__, status);
1113                 tdev->td_urb_error = 1;
1114                 goto exit;
1115         }
1116
1117         if (length != 2) {
1118                 dbg("%s - bad packet size, %d", __func__, length);
1119                 goto exit;
1120         }
1121
1122         if (data[0] == TI_CODE_HARDWARE_ERROR) {
1123                 dev_err(dev, "%s - hardware error, %d\n", __func__, data[1]);
1124                 goto exit;
1125         }
1126
1127         port_number = TI_GET_PORT_FROM_CODE(data[0]);
1128         function = TI_GET_FUNC_FROM_CODE(data[0]);
1129
1130         dbg("%s - port_number %d, function %d, data 0x%02X",
1131                                 __func__, port_number, function, data[1]);
1132
1133         if (port_number >= serial->num_ports) {
1134                 dev_err(dev, "%s - bad port number, %d\n",
1135                                                 __func__, port_number);
1136                 goto exit;
1137         }
1138
1139         port = serial->port[port_number];
1140
1141         tport = usb_get_serial_port_data(port);
1142         if (!tport)
1143                 goto exit;
1144
1145         switch (function) {
1146         case TI_CODE_DATA_ERROR:
1147                 dev_err(dev, "%s - DATA ERROR, port %d, data 0x%02X\n",
1148                                         __func__, port_number, data[1]);
1149                 break;
1150
1151         case TI_CODE_MODEM_STATUS:
1152                 msr = data[1];
1153                 dbg("%s - port %d, msr 0x%02X", __func__, port_number, msr);
1154                 ti_handle_new_msr(tport, msr);
1155                 break;
1156
1157         default:
1158                 dev_err(dev, "%s - unknown interrupt code, 0x%02X\n",
1159                                                         __func__, data[1]);
1160                 break;
1161         }
1162
1163 exit:
1164         retval = usb_submit_urb(urb, GFP_ATOMIC);
1165         if (retval)
1166                 dev_err(dev, "%s - resubmit interrupt urb failed, %d\n",
1167                         __func__, retval);
1168 }
1169
1170
1171 static void ti_bulk_in_callback(struct urb *urb)
1172 {
1173         struct ti_port *tport = urb->context;
1174         struct usb_serial_port *port = tport->tp_port;
1175         struct device *dev = &urb->dev->dev;
1176         int status = urb->status;
1177         int retval = 0;
1178         struct tty_struct *tty;
1179
1180         dbg("%s", __func__);
1181
1182         switch (status) {
1183         case 0:
1184                 break;
1185         case -ECONNRESET:
1186         case -ENOENT:
1187         case -ESHUTDOWN:
1188                 dbg("%s - urb shutting down, %d", __func__, status);
1189                 tport->tp_tdev->td_urb_error = 1;
1190                 wake_up_interruptible(&tport->tp_write_wait);
1191                 return;
1192         default:
1193                 dev_err(dev, "%s - nonzero urb status, %d\n",
1194                         __func__, status);
1195                 tport->tp_tdev->td_urb_error = 1;
1196                 wake_up_interruptible(&tport->tp_write_wait);
1197         }
1198
1199         if (status == -EPIPE)
1200                 goto exit;
1201
1202         if (status) {
1203                 dev_err(dev, "%s - stopping read!\n", __func__);
1204                 return;
1205         }
1206
1207         tty = tty_port_tty_get(&port->port);
1208         if (tty) {
1209                 if (urb->actual_length) {
1210                         usb_serial_debug_data(debug, dev, __func__,
1211                                 urb->actual_length, urb->transfer_buffer);
1212
1213                         if (!tport->tp_is_open)
1214                                 dbg("%s - port closed, dropping data",
1215                                         __func__);
1216                         else
1217                                 ti_recv(&urb->dev->dev, tty,
1218                                                 urb->transfer_buffer,
1219                                                 urb->actual_length);
1220                         spin_lock(&tport->tp_lock);
1221                         tport->tp_icount.rx += urb->actual_length;
1222                         spin_unlock(&tport->tp_lock);
1223                 }
1224                 tty_kref_put(tty);
1225         }
1226
1227 exit:
1228         /* continue to read unless stopping */
1229         spin_lock(&tport->tp_lock);
1230         if (tport->tp_read_urb_state == TI_READ_URB_RUNNING) {
1231                 urb->dev = port->serial->dev;
1232                 retval = usb_submit_urb(urb, GFP_ATOMIC);
1233         } else if (tport->tp_read_urb_state == TI_READ_URB_STOPPING) {
1234                 tport->tp_read_urb_state = TI_READ_URB_STOPPED;
1235         }
1236         spin_unlock(&tport->tp_lock);
1237         if (retval)
1238                 dev_err(dev, "%s - resubmit read urb failed, %d\n",
1239                         __func__, retval);
1240 }
1241
1242
1243 static void ti_bulk_out_callback(struct urb *urb)
1244 {
1245         struct ti_port *tport = urb->context;
1246         struct usb_serial_port *port = tport->tp_port;
1247         struct device *dev = &urb->dev->dev;
1248         int status = urb->status;
1249
1250         dbg("%s - port %d", __func__, port->number);
1251
1252         tport->tp_write_urb_in_use = 0;
1253
1254         switch (status) {
1255         case 0:
1256                 break;
1257         case -ECONNRESET:
1258         case -ENOENT:
1259         case -ESHUTDOWN:
1260                 dbg("%s - urb shutting down, %d", __func__, status);
1261                 tport->tp_tdev->td_urb_error = 1;
1262                 wake_up_interruptible(&tport->tp_write_wait);
1263                 return;
1264         default:
1265                 dev_err(dev, "%s - nonzero urb status, %d\n",
1266                         __func__, status);
1267                 tport->tp_tdev->td_urb_error = 1;
1268                 wake_up_interruptible(&tport->tp_write_wait);
1269         }
1270
1271         /* send any buffered data */
1272         ti_send(tport);
1273 }
1274
1275
1276 static void ti_recv(struct device *dev, struct tty_struct *tty,
1277         unsigned char *data, int length)
1278 {
1279         int cnt;
1280
1281         do {
1282                 cnt = tty_insert_flip_string(tty, data, length);
1283                 if (cnt < length) {
1284                         dev_err(dev, "%s - dropping data, %d bytes lost\n",
1285                                                 __func__, length - cnt);
1286                         if (cnt == 0)
1287                                 break;
1288                 }
1289                 tty_flip_buffer_push(tty);
1290                 data += cnt;
1291                 length -= cnt;
1292         } while (length > 0);
1293
1294 }
1295
1296
1297 static void ti_send(struct ti_port *tport)
1298 {
1299         int count, result;
1300         struct usb_serial_port *port = tport->tp_port;
1301         struct tty_struct *tty = tty_port_tty_get(&port->port); /* FIXME */
1302         unsigned long flags;
1303
1304
1305         dbg("%s - port %d", __func__, port->number);
1306
1307         spin_lock_irqsave(&tport->tp_lock, flags);
1308
1309         if (tport->tp_write_urb_in_use)
1310                 goto unlock;
1311
1312         count = ti_buf_get(tport->tp_write_buf,
1313                                 port->write_urb->transfer_buffer,
1314                                 port->bulk_out_size);
1315
1316         if (count == 0)
1317                 goto unlock;
1318
1319         tport->tp_write_urb_in_use = 1;
1320
1321         spin_unlock_irqrestore(&tport->tp_lock, flags);
1322
1323         usb_serial_debug_data(debug, &port->dev, __func__, count,
1324                                         port->write_urb->transfer_buffer);
1325
1326         usb_fill_bulk_urb(port->write_urb, port->serial->dev,
1327                            usb_sndbulkpipe(port->serial->dev,
1328                                             port->bulk_out_endpointAddress),
1329                            port->write_urb->transfer_buffer, count,
1330                            ti_bulk_out_callback, tport);
1331
1332         result = usb_submit_urb(port->write_urb, GFP_ATOMIC);
1333         if (result) {
1334                 dev_err(&port->dev, "%s - submit write urb failed, %d\n",
1335                                                         __func__, result);
1336                 tport->tp_write_urb_in_use = 0;
1337                 /* TODO: reschedule ti_send */
1338         } else {
1339                 spin_lock_irqsave(&tport->tp_lock, flags);
1340                 tport->tp_icount.tx += count;
1341                 spin_unlock_irqrestore(&tport->tp_lock, flags);
1342         }
1343
1344         /* more room in the buffer for new writes, wakeup */
1345         if (tty)
1346                 tty_wakeup(tty);
1347         tty_kref_put(tty);
1348         wake_up_interruptible(&tport->tp_write_wait);
1349         return;
1350 unlock:
1351         spin_unlock_irqrestore(&tport->tp_lock, flags);
1352         tty_kref_put(tty);
1353         return;
1354 }
1355
1356
1357 static int ti_set_mcr(struct ti_port *tport, unsigned int mcr)
1358 {
1359         unsigned long flags;
1360         int status;
1361
1362         status = ti_write_byte(tport->tp_tdev,
1363                 tport->tp_uart_base_addr + TI_UART_OFFSET_MCR,
1364                 TI_MCR_RTS | TI_MCR_DTR | TI_MCR_LOOP, mcr);
1365
1366         spin_lock_irqsave(&tport->tp_lock, flags);
1367         if (!status)
1368                 tport->tp_shadow_mcr = mcr;
1369         spin_unlock_irqrestore(&tport->tp_lock, flags);
1370
1371         return status;
1372 }
1373
1374
1375 static int ti_get_lsr(struct ti_port *tport)
1376 {
1377         int size, status;
1378         struct ti_device *tdev = tport->tp_tdev;
1379         struct usb_serial_port *port = tport->tp_port;
1380         int port_number = port->number - port->serial->minor;
1381         struct ti_port_status *data;
1382
1383         dbg("%s - port %d", __func__, port->number);
1384
1385         size = sizeof(struct ti_port_status);
1386         data = kmalloc(size, GFP_KERNEL);
1387         if (!data) {
1388                 dev_err(&port->dev, "%s - out of memory\n", __func__);
1389                 return -ENOMEM;
1390         }
1391
1392         status = ti_command_in_sync(tdev, TI_GET_PORT_STATUS,
1393                 (__u8)(TI_UART1_PORT+port_number), 0, (__u8 *)data, size);
1394         if (status) {
1395                 dev_err(&port->dev,
1396                         "%s - get port status command failed, %d\n",
1397                                                         __func__, status);
1398                 goto free_data;
1399         }
1400
1401         dbg("%s - lsr 0x%02X", __func__, data->bLSR);
1402
1403         tport->tp_lsr = data->bLSR;
1404
1405 free_data:
1406         kfree(data);
1407         return status;
1408 }
1409
1410
1411 static int ti_get_serial_info(struct ti_port *tport,
1412         struct serial_struct __user *ret_arg)
1413 {
1414         struct usb_serial_port *port = tport->tp_port;
1415         struct serial_struct ret_serial;
1416
1417         if (!ret_arg)
1418                 return -EFAULT;
1419
1420         memset(&ret_serial, 0, sizeof(ret_serial));
1421
1422         ret_serial.type = PORT_16550A;
1423         ret_serial.line = port->serial->minor;
1424         ret_serial.port = port->number - port->serial->minor;
1425         ret_serial.flags = tport->tp_flags;
1426         ret_serial.xmit_fifo_size = TI_WRITE_BUF_SIZE;
1427         ret_serial.baud_base = tport->tp_tdev->td_is_3410 ? 921600 : 460800;
1428         ret_serial.closing_wait = tport->tp_closing_wait;
1429
1430         if (copy_to_user(ret_arg, &ret_serial, sizeof(*ret_arg)))
1431                 return -EFAULT;
1432
1433         return 0;
1434 }
1435
1436
1437 static int ti_set_serial_info(struct tty_struct *tty, struct ti_port *tport,
1438         struct serial_struct __user *new_arg)
1439 {
1440         struct serial_struct new_serial;
1441
1442         if (copy_from_user(&new_serial, new_arg, sizeof(new_serial)))
1443                 return -EFAULT;
1444
1445         tport->tp_flags = new_serial.flags & TI_SET_SERIAL_FLAGS;
1446         tport->tp_closing_wait = new_serial.closing_wait;
1447
1448         return 0;
1449 }
1450
1451
1452 static void ti_handle_new_msr(struct ti_port *tport, __u8 msr)
1453 {
1454         struct async_icount *icount;
1455         struct tty_struct *tty;
1456         unsigned long flags;
1457
1458         dbg("%s - msr 0x%02X", __func__, msr);
1459
1460         if (msr & TI_MSR_DELTA_MASK) {
1461                 spin_lock_irqsave(&tport->tp_lock, flags);
1462                 icount = &tport->tp_icount;
1463                 if (msr & TI_MSR_DELTA_CTS)
1464                         icount->cts++;
1465                 if (msr & TI_MSR_DELTA_DSR)
1466                         icount->dsr++;
1467                 if (msr & TI_MSR_DELTA_CD)
1468                         icount->dcd++;
1469                 if (msr & TI_MSR_DELTA_RI)
1470                         icount->rng++;
1471                 wake_up_interruptible(&tport->tp_msr_wait);
1472                 spin_unlock_irqrestore(&tport->tp_lock, flags);
1473         }
1474
1475         tport->tp_msr = msr & TI_MSR_MASK;
1476
1477         /* handle CTS flow control */
1478         tty = tty_port_tty_get(&tport->tp_port->port);
1479         if (tty && C_CRTSCTS(tty)) {
1480                 if (msr & TI_MSR_CTS) {
1481                         tty->hw_stopped = 0;
1482                         tty_wakeup(tty);
1483                 } else {
1484                         tty->hw_stopped = 1;
1485                 }
1486         }
1487         tty_kref_put(tty);
1488 }
1489
1490
1491 static void ti_drain(struct ti_port *tport, unsigned long timeout, int flush)
1492 {
1493         struct ti_device *tdev = tport->tp_tdev;
1494         struct usb_serial_port *port = tport->tp_port;
1495         wait_queue_t wait;
1496
1497         dbg("%s - port %d", __func__, port->number);
1498
1499         spin_lock_irq(&tport->tp_lock);
1500
1501         /* wait for data to drain from the buffer */
1502         tdev->td_urb_error = 0;
1503         init_waitqueue_entry(&wait, current);
1504         add_wait_queue(&tport->tp_write_wait, &wait);
1505         for (;;) {
1506                 set_current_state(TASK_INTERRUPTIBLE);
1507                 if (ti_buf_data_avail(tport->tp_write_buf) == 0
1508                 || timeout == 0 || signal_pending(current)
1509                 || tdev->td_urb_error
1510                 || port->serial->disconnected)  /* disconnect */
1511                         break;
1512                 spin_unlock_irq(&tport->tp_lock);
1513                 timeout = schedule_timeout(timeout);
1514                 spin_lock_irq(&tport->tp_lock);
1515         }
1516         set_current_state(TASK_RUNNING);
1517         remove_wait_queue(&tport->tp_write_wait, &wait);
1518
1519         /* flush any remaining data in the buffer */
1520         if (flush)
1521                 ti_buf_clear(tport->tp_write_buf);
1522
1523         spin_unlock_irq(&tport->tp_lock);
1524
1525         mutex_lock(&port->serial->disc_mutex);
1526         /* wait for data to drain from the device */
1527         /* wait for empty tx register, plus 20 ms */
1528         timeout += jiffies;
1529         tport->tp_lsr &= ~TI_LSR_TX_EMPTY;
1530         while ((long)(jiffies - timeout) < 0 && !signal_pending(current)
1531         && !(tport->tp_lsr&TI_LSR_TX_EMPTY) && !tdev->td_urb_error
1532         && !port->serial->disconnected) {
1533                 if (ti_get_lsr(tport))
1534                         break;
1535                 mutex_unlock(&port->serial->disc_mutex);
1536                 msleep_interruptible(20);
1537                 mutex_lock(&port->serial->disc_mutex);
1538         }
1539         mutex_unlock(&port->serial->disc_mutex);
1540 }
1541
1542
1543 static void ti_stop_read(struct ti_port *tport, struct tty_struct *tty)
1544 {
1545         unsigned long flags;
1546
1547         spin_lock_irqsave(&tport->tp_lock, flags);
1548
1549         if (tport->tp_read_urb_state == TI_READ_URB_RUNNING)
1550                 tport->tp_read_urb_state = TI_READ_URB_STOPPING;
1551
1552         spin_unlock_irqrestore(&tport->tp_lock, flags);
1553 }
1554
1555
1556 static int ti_restart_read(struct ti_port *tport, struct tty_struct *tty)
1557 {
1558         struct urb *urb;
1559         int status = 0;
1560         unsigned long flags;
1561
1562         spin_lock_irqsave(&tport->tp_lock, flags);
1563
1564         if (tport->tp_read_urb_state == TI_READ_URB_STOPPED) {
1565                 tport->tp_read_urb_state = TI_READ_URB_RUNNING;
1566                 urb = tport->tp_port->read_urb;
1567                 spin_unlock_irqrestore(&tport->tp_lock, flags);
1568                 urb->complete = ti_bulk_in_callback;
1569                 urb->context = tport;
1570                 urb->dev = tport->tp_port->serial->dev;
1571                 status = usb_submit_urb(urb, GFP_KERNEL);
1572         } else  {
1573                 tport->tp_read_urb_state = TI_READ_URB_RUNNING;
1574                 spin_unlock_irqrestore(&tport->tp_lock, flags);
1575         }
1576
1577         return status;
1578 }
1579
1580
1581 static int ti_command_out_sync(struct ti_device *tdev, __u8 command,
1582         __u16 moduleid, __u16 value, __u8 *data, int size)
1583 {
1584         int status;
1585
1586         status = usb_control_msg(tdev->td_serial->dev,
1587                 usb_sndctrlpipe(tdev->td_serial->dev, 0), command,
1588                 (USB_TYPE_VENDOR | USB_RECIP_DEVICE | USB_DIR_OUT),
1589                 value, moduleid, data, size, 1000);
1590
1591         if (status == size)
1592                 status = 0;
1593
1594         if (status > 0)
1595                 status = -ECOMM;
1596
1597         return status;
1598 }
1599
1600
1601 static int ti_command_in_sync(struct ti_device *tdev, __u8 command,
1602         __u16 moduleid, __u16 value, __u8 *data, int size)
1603 {
1604         int status;
1605
1606         status = usb_control_msg(tdev->td_serial->dev,
1607                 usb_rcvctrlpipe(tdev->td_serial->dev, 0), command,
1608                 (USB_TYPE_VENDOR | USB_RECIP_DEVICE | USB_DIR_IN),
1609                 value, moduleid, data, size, 1000);
1610
1611         if (status == size)
1612                 status = 0;
1613
1614         if (status > 0)
1615                 status = -ECOMM;
1616
1617         return status;
1618 }
1619
1620
1621 static int ti_write_byte(struct ti_device *tdev, unsigned long addr,
1622         __u8 mask, __u8 byte)
1623 {
1624         int status;
1625         unsigned int size;
1626         struct ti_write_data_bytes *data;
1627         struct device *dev = &tdev->td_serial->dev->dev;
1628
1629         dbg("%s - addr 0x%08lX, mask 0x%02X, byte 0x%02X",
1630                                         __func__, addr, mask, byte);
1631
1632         size = sizeof(struct ti_write_data_bytes) + 2;
1633         data = kmalloc(size, GFP_KERNEL);
1634         if (!data) {
1635                 dev_err(dev, "%s - out of memory\n", __func__);
1636                 return -ENOMEM;
1637         }
1638
1639         data->bAddrType = TI_RW_DATA_ADDR_XDATA;
1640         data->bDataType = TI_RW_DATA_BYTE;
1641         data->bDataCounter = 1;
1642         data->wBaseAddrHi = cpu_to_be16(addr>>16);
1643         data->wBaseAddrLo = cpu_to_be16(addr);
1644         data->bData[0] = mask;
1645         data->bData[1] = byte;
1646
1647         status = ti_command_out_sync(tdev, TI_WRITE_DATA, TI_RAM_PORT, 0,
1648                 (__u8 *)data, size);
1649
1650         if (status < 0)
1651                 dev_err(dev, "%s - failed, %d\n", __func__, status);
1652
1653         kfree(data);
1654
1655         return status;
1656 }
1657
1658 static int ti_do_download(struct usb_device *dev, int pipe,
1659                                                 u8 *buffer, int size)
1660 {
1661         int pos;
1662         u8 cs = 0;
1663         int done;
1664         struct ti_firmware_header *header;
1665         int status = 0;
1666         int len;
1667
1668         for (pos = sizeof(struct ti_firmware_header); pos < size; pos++)
1669                 cs = (__u8)(cs + buffer[pos]);
1670
1671         header = (struct ti_firmware_header *)buffer;
1672         header->wLength = cpu_to_le16((__u16)(size
1673                                         - sizeof(struct ti_firmware_header)));
1674         header->bCheckSum = cs;
1675
1676         dbg("%s - downloading firmware", __func__);
1677         for (pos = 0; pos < size; pos += done) {
1678                 len = min(size - pos, TI_DOWNLOAD_MAX_PACKET_SIZE);
1679                 status = usb_bulk_msg(dev, pipe, buffer + pos, len,
1680                                                                 &done, 1000);
1681                 if (status)
1682                         break;
1683         }
1684         return status;
1685 }
1686
1687 static int ti_download_firmware(struct ti_device *tdev)
1688 {
1689         int status;
1690         int buffer_size;
1691         __u8 *buffer;
1692         struct usb_device *dev = tdev->td_serial->dev;
1693         unsigned int pipe = usb_sndbulkpipe(dev,
1694                 tdev->td_serial->port[0]->bulk_out_endpointAddress);
1695         const struct firmware *fw_p;
1696         char buf[32];
1697
1698         dbg("%s\n", __func__);
1699         /* try ID specific firmware first, then try generic firmware */
1700         sprintf(buf, "ti_usb-v%04x-p%04x.fw", dev->descriptor.idVendor,
1701             dev->descriptor.idProduct);
1702         if ((status = request_firmware(&fw_p, buf, &dev->dev)) != 0) {
1703                 buf[0] = '\0';
1704                 if (dev->descriptor.idVendor == MTS_VENDOR_ID) {
1705                         switch (dev->descriptor.idProduct) {
1706                         case MTS_CDMA_PRODUCT_ID:
1707                                 strcpy(buf, "mts_cdma.fw");
1708                                 break;
1709                         case MTS_GSM_PRODUCT_ID:
1710                                 strcpy(buf, "mts_gsm.fw");
1711                                 break;
1712                         case MTS_EDGE_PRODUCT_ID:
1713                                 strcpy(buf, "mts_edge.fw");
1714                                 break;
1715                         case MTS_MT9234MU_PRODUCT_ID:
1716                                 strcpy(buf, "mts_mt9234mu.fw");
1717                                 break;
1718                         case MTS_MT9234ZBA_PRODUCT_ID:
1719                                 strcpy(buf, "mts_mt9234zba.fw");
1720                                 break;
1721                         case MTS_MT9234ZBAOLD_PRODUCT_ID:
1722                                 strcpy(buf, "mts_mt9234zba.fw");
1723                                 break;                  }
1724                 }
1725                 if (buf[0] == '\0') {
1726                         if (tdev->td_is_3410)
1727                                 strcpy(buf, "ti_3410.fw");
1728                         else
1729                                 strcpy(buf, "ti_5052.fw");
1730                 }
1731                 status = request_firmware(&fw_p, buf, &dev->dev);
1732         }
1733         if (status) {
1734                 dev_err(&dev->dev, "%s - firmware not found\n", __func__);
1735                 return -ENOENT;
1736         }
1737         if (fw_p->size > TI_FIRMWARE_BUF_SIZE) {
1738                 dev_err(&dev->dev, "%s - firmware too large %zu\n", __func__, fw_p->size);
1739                 return -ENOENT;
1740         }
1741
1742         buffer_size = TI_FIRMWARE_BUF_SIZE + sizeof(struct ti_firmware_header);
1743         buffer = kmalloc(buffer_size, GFP_KERNEL);
1744         if (buffer) {
1745                 memcpy(buffer, fw_p->data, fw_p->size);
1746                 memset(buffer + fw_p->size, 0xff, buffer_size - fw_p->size);
1747                 status = ti_do_download(dev, pipe, buffer, fw_p->size);
1748                 kfree(buffer);
1749         } else {
1750                 dbg("%s ENOMEM\n", __func__);
1751                 status = -ENOMEM;
1752         }
1753         release_firmware(fw_p);
1754         if (status) {
1755                 dev_err(&dev->dev, "%s - error downloading firmware, %d\n",
1756                                                         __func__, status);
1757                 return status;
1758         }
1759
1760         dbg("%s - download successful", __func__);
1761
1762         return 0;
1763 }
1764
1765
1766 /* Circular Buffer Functions */
1767
1768 /*
1769  * ti_buf_alloc
1770  *
1771  * Allocate a circular buffer and all associated memory.
1772  */
1773
1774 static struct circ_buf *ti_buf_alloc(void)
1775 {
1776         struct circ_buf *cb;
1777
1778         cb = kmalloc(sizeof(struct circ_buf), GFP_KERNEL);
1779         if (cb == NULL)
1780                 return NULL;
1781
1782         cb->buf = kmalloc(TI_WRITE_BUF_SIZE, GFP_KERNEL);
1783         if (cb->buf == NULL) {
1784                 kfree(cb);
1785                 return NULL;
1786         }
1787
1788         ti_buf_clear(cb);
1789
1790         return cb;
1791 }
1792
1793
1794 /*
1795  * ti_buf_free
1796  *
1797  * Free the buffer and all associated memory.
1798  */
1799
1800 static void ti_buf_free(struct circ_buf *cb)
1801 {
1802         kfree(cb->buf);
1803         kfree(cb);
1804 }
1805
1806
1807 /*
1808  * ti_buf_clear
1809  *
1810  * Clear out all data in the circular buffer.
1811  */
1812
1813 static void ti_buf_clear(struct circ_buf *cb)
1814 {
1815         cb->head = cb->tail = 0;
1816 }
1817
1818
1819 /*
1820  * ti_buf_data_avail
1821  *
1822  * Return the number of bytes of data available in the circular
1823  * buffer.
1824  */
1825
1826 static int ti_buf_data_avail(struct circ_buf *cb)
1827 {
1828         return CIRC_CNT(cb->head, cb->tail, TI_WRITE_BUF_SIZE);
1829 }
1830
1831
1832 /*
1833  * ti_buf_space_avail
1834  *
1835  * Return the number of bytes of space available in the circular
1836  * buffer.
1837  */
1838
1839 static int ti_buf_space_avail(struct circ_buf *cb)
1840 {
1841         return CIRC_SPACE(cb->head, cb->tail, TI_WRITE_BUF_SIZE);
1842 }
1843
1844
1845 /*
1846  * ti_buf_put
1847  *
1848  * Copy data data from a user buffer and put it into the circular buffer.
1849  * Restrict to the amount of space available.
1850  *
1851  * Return the number of bytes copied.
1852  */
1853
1854 static int ti_buf_put(struct circ_buf *cb, const char *buf, int count)
1855 {
1856         int c, ret = 0;
1857
1858         while (1) {
1859                 c = CIRC_SPACE_TO_END(cb->head, cb->tail, TI_WRITE_BUF_SIZE);
1860                 if (count < c)
1861                         c = count;
1862                 if (c <= 0)
1863                         break;
1864                 memcpy(cb->buf + cb->head, buf, c);
1865                 cb->head = (cb->head + c) & (TI_WRITE_BUF_SIZE-1);
1866                 buf += c;
1867                 count -= c;
1868                 ret += c;
1869         }
1870
1871         return ret;
1872 }
1873
1874
1875 /*
1876  * ti_buf_get
1877  *
1878  * Get data from the circular buffer and copy to the given buffer.
1879  * Restrict to the amount of data available.
1880  *
1881  * Return the number of bytes copied.
1882  */
1883
1884 static int ti_buf_get(struct circ_buf *cb, char *buf, int count)
1885 {
1886         int c, ret = 0;
1887
1888         while (1) {
1889                 c = CIRC_CNT_TO_END(cb->head, cb->tail, TI_WRITE_BUF_SIZE);
1890                 if (count < c)
1891                         c = count;
1892                 if (c <= 0)
1893                         break;
1894                 memcpy(buf, cb->buf + cb->tail, c);
1895                 cb->tail = (cb->tail + c) & (TI_WRITE_BUF_SIZE-1);
1896                 buf += c;
1897                 count -= c;
1898                 ret += c;
1899         }
1900
1901         return ret;
1902 }