drivers/usb/serial/ti_usb_3410_5052.c

   1 /* vi: ts=8 sw=8
   2  *
   3  * TI 3410/5052 USB Serial Driver
   4  *
   5  * Copyright (C) 2004 Texas Instruments
   6  *
   7  * This driver is based on the Linux io_ti driver, which is
   8  *   Copyright (C) 2000-2002 Inside Out Networks
   9  *   Copyright (C) 2001-2002 Greg Kroah-Hartman
  10  *
  11  * This program is free software; you can redistribute it and/or modify
  12  * it under the terms of the GNU General Public License as published by
  13  * the Free Software Foundation; either version 2 of the License, or
  14  * (at your option) any later version.
  15  *
  16  * For questions or problems with this driver, contact Texas Instruments
  17  * technical support, or Al Borchers <alborchers@steinerpoint.com>, or
  18  * Peter Berger <pberger@brimson.com>.
  19  */
  20
  21 #include <linux/kernel.h>
  22 #include <linux/errno.h>
  23 #include <linux/firmware.h>
  24 #include <linux/init.h>
  25 #include <linux/slab.h>
  26 #include <linux/tty.h>
  27 #include <linux/tty_driver.h>
  28 #include <linux/tty_flip.h>
  29 #include <linux/module.h>
  30 #include <linux/spinlock.h>
  31 #include <linux/ioctl.h>
  32 #include <linux/serial.h>
  33 #include <linux/circ_buf.h>
  34 #include <linux/mutex.h>
  35 #include <linux/uaccess.h>
  36 #include <linux/usb.h>
  37 #include <linux/usb/serial.h>
  38
  39 #include "ti_usb_3410_5052.h"
  40
  41 /* Defines */
  42
  43 #define TI_DRIVER_VERSION       "v0.9"
  44 #define TI_DRIVER_AUTHOR        "Al Borchers <alborchers@steinerpoint.com>"
  45 #define TI_DRIVER_DESC          "TI USB 3410/5052 Serial Driver"
  46
  47 #define TI_FIRMWARE_BUF_SIZE    16284
  48
  49 #define TI_WRITE_BUF_SIZE       1024
  50
  51 #define TI_TRANSFER_TIMEOUT     2
  52
  53 #define TI_DEFAULT_LOW_LATENCY  0
  54 #define TI_DEFAULT_CLOSING_WAIT 4000            /* in .01 secs */
  55
  56 /* supported setserial flags */
  57 #define TI_SET_SERIAL_FLAGS     (ASYNC_LOW_LATENCY)
  58
  59 /* read urb states */
  60 #define TI_READ_URB_RUNNING     0
  61 #define TI_READ_URB_STOPPING    1
  62 #define TI_READ_URB_STOPPED     2
  63
  64 #define TI_EXTRA_VID_PID_COUNT  5
  65
  66
  67 /* Structures */
  68
  69 struct ti_port {
  70         int                     tp_is_open;
  71         __u8                    tp_msr;
  72         __u8                    tp_lsr;
  73         __u8                    tp_shadow_mcr;
  74         __u8                    tp_uart_mode;   /* 232 or 485 modes */
  75         unsigned int            tp_uart_base_addr;
  76         int                     tp_flags;
  77         int                     tp_closing_wait;/* in .01 secs */
  78         struct async_icount     tp_icount;
  79         wait_queue_head_t       tp_msr_wait;    /* wait for msr change */
  80         wait_queue_head_t       tp_write_wait;
  81         struct ti_device        *tp_tdev;
  82         struct usb_serial_port  *tp_port;
  83         spinlock_t              tp_lock;
  84         int                     tp_read_urb_state;
  85         int                     tp_write_urb_in_use;
  86         struct circ_buf         *tp_write_buf;
  87 };
  88
  89 struct ti_device {
  90         struct mutex            td_open_close_lock;
  91         int                     td_open_port_count;
  92         struct usb_serial       *td_serial;
  93         int                     td_is_3410;
  94         int                     td_urb_error;
  95 };
  96
  97
  98 /* Function Declarations */
  99
 100 static int ti_startup(struct usb_serial *serial);
 101 static void ti_shutdown(struct usb_serial *serial);
 102 static int ti_open(struct tty_struct *tty, struct usb_serial_port *port,
 103                 struct file *file);
 104 static void ti_close(struct tty_struct *tty, struct usb_serial_port *port,
 105                 struct file *file);
 106 static int ti_write(struct tty_struct *tty, struct usb_serial_port *port,
 107                 const unsigned char *data, int count);
 108 static int ti_write_room(struct tty_struct *tty);
 109 static int ti_chars_in_buffer(struct tty_struct *tty);
 110 static void ti_throttle(struct tty_struct *tty);
 111 static void ti_unthrottle(struct tty_struct *tty);
 112 static int ti_ioctl(struct tty_struct *tty, struct file *file,
 113                 unsigned int cmd, unsigned long arg);
 114 static void ti_set_termios(struct tty_struct *tty,
 115                 struct usb_serial_port *port, struct ktermios *old_termios);
 116 static int ti_tiocmget(struct tty_struct *tty, struct file *file);
 117 static int ti_tiocmset(struct tty_struct *tty, struct file *file,
 118                 unsigned int set, unsigned int clear);
 119 static void ti_break(struct tty_struct *tty, int break_state);
 120 static void ti_interrupt_callback(struct urb *urb);
 121 static void ti_bulk_in_callback(struct urb *urb);
 122 static void ti_bulk_out_callback(struct urb *urb);
 123
 124 static void ti_recv(struct device *dev, struct tty_struct *tty,
 125         unsigned char *data, int length);
 126 static void ti_send(struct ti_port *tport);
 127 static int ti_set_mcr(struct ti_port *tport, unsigned int mcr);
 128 static int ti_get_lsr(struct ti_port *tport);
 129 static int ti_get_serial_info(struct ti_port *tport,
 130         struct serial_struct __user *ret_arg);
 131 static int ti_set_serial_info(struct tty_struct *tty, struct ti_port *tport,
 132         struct serial_struct __user *new_arg);
 133 static void ti_handle_new_msr(struct ti_port *tport, __u8 msr);
 134
 135 static void ti_drain(struct ti_port *tport, unsigned long timeout, int flush);
 136
 137 static void ti_stop_read(struct ti_port *tport, struct tty_struct *tty);
 138 static int ti_restart_read(struct ti_port *tport, struct tty_struct *tty);
 139
 140 static int ti_command_out_sync(struct ti_device *tdev, __u8 command,
 141         __u16 moduleid, __u16 value, __u8 *data, int size);
 142 static int ti_command_in_sync(struct ti_device *tdev, __u8 command,
 143         __u16 moduleid, __u16 value, __u8 *data, int size);
 144
 145 static int ti_write_byte(struct ti_device *tdev, unsigned long addr,
 146         __u8 mask, __u8 byte);
 147
 148 static int ti_download_firmware(struct ti_device *tdev);
 149
 150 /* circular buffer */
 151 static struct circ_buf *ti_buf_alloc(void);
 152 static void ti_buf_free(struct circ_buf *cb);
 153 static void ti_buf_clear(struct circ_buf *cb);
 154 static int ti_buf_data_avail(struct circ_buf *cb);
 155 static int ti_buf_space_avail(struct circ_buf *cb);
 156 static int ti_buf_put(struct circ_buf *cb, const char *buf, int count);
 157 static int ti_buf_get(struct circ_buf *cb, char *buf, int count);
 158
 159
 160 /* Data */
 161
 162 /* module parameters */
 163 static int debug;
 164 static int low_latency = TI_DEFAULT_LOW_LATENCY;
 165 static int closing_wait = TI_DEFAULT_CLOSING_WAIT;
 166 static ushort vendor_3410[TI_EXTRA_VID_PID_COUNT];
 167 static unsigned int vendor_3410_count;
 168 static ushort product_3410[TI_EXTRA_VID_PID_COUNT];
 169 static unsigned int product_3410_count;
 170 static ushort vendor_5052[TI_EXTRA_VID_PID_COUNT];
 171 static unsigned int vendor_5052_count;
 172 static ushort product_5052[TI_EXTRA_VID_PID_COUNT];
 173 static unsigned int product_5052_count;
 174
 175 /* supported devices */
 176 /* the array dimension is the number of default entries plus */
 177 /* TI_EXTRA_VID_PID_COUNT user defined entries plus 1 terminating */
 178 /* null entry */
 179 static struct usb_device_id ti_id_table_3410[7+TI_EXTRA_VID_PID_COUNT+1] = {
 180         { USB_DEVICE(TI_VENDOR_ID, TI_3410_PRODUCT_ID) },
 181         { USB_DEVICE(TI_VENDOR_ID, TI_3410_EZ430_ID) },
 182         { USB_DEVICE(MTS_VENDOR_ID, MTS_GSM_NO_FW_PRODUCT_ID) },
 183         { USB_DEVICE(MTS_VENDOR_ID, MTS_CDMA_NO_FW_PRODUCT_ID) },
 184         { USB_DEVICE(MTS_VENDOR_ID, MTS_CDMA_PRODUCT_ID) },
 185         { USB_DEVICE(MTS_VENDOR_ID, MTS_GSM_PRODUCT_ID) },
 186         { USB_DEVICE(MTS_VENDOR_ID, MTS_EDGE_PRODUCT_ID) },
 187         { USB_DEVICE(IBM_VENDOR_ID, IBM_4543_PRODUCT_ID) },
 188 };
 189
 190 static struct usb_device_id ti_id_table_5052[4+TI_EXTRA_VID_PID_COUNT+1] = {
 191         { USB_DEVICE(TI_VENDOR_ID, TI_5052_BOOT_PRODUCT_ID) },
 192         { USB_DEVICE(TI_VENDOR_ID, TI_5152_BOOT_PRODUCT_ID) },
 193         { USB_DEVICE(TI_VENDOR_ID, TI_5052_EEPROM_PRODUCT_ID) },
 194         { USB_DEVICE(TI_VENDOR_ID, TI_5052_FIRMWARE_PRODUCT_ID) },
 195         { USB_DEVICE(IBM_VENDOR_ID, IBM_4543_PRODUCT_ID) },
 196 };
 197
 198 static struct usb_device_id ti_id_table_combined[6+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(TI_VENDOR_ID, TI_5052_BOOT_PRODUCT_ID) },
 207         { USB_DEVICE(TI_VENDOR_ID, TI_5152_BOOT_PRODUCT_ID) },
 208         { USB_DEVICE(TI_VENDOR_ID, TI_5052_EEPROM_PRODUCT_ID) },
 209         { USB_DEVICE(TI_VENDOR_ID, TI_5052_FIRMWARE_PRODUCT_ID) },
 210         { USB_DEVICE(IBM_VENDOR_ID, IBM_4543_PRODUCT_ID) },
 211         { }
 212 };
 213
 214 static struct usb_driver ti_usb_driver = {
 215         .name                   = "ti_usb_3410_5052",
 216         .probe                  = usb_serial_probe,
 217         .disconnect             = usb_serial_disconnect,
 218         .id_table               = ti_id_table_combined,
 219         .no_dynamic_id =        1,
 220 };
 221
 222 static struct usb_serial_driver ti_1port_device = {
 223         .driver = {
 224                 .owner          = THIS_MODULE,
 225                 .name           = "ti_usb_3410_5052_1",
 226         },
 227         .description            = "TI USB 3410 1 port adapter",
 228         .usb_driver             = &ti_usb_driver,
 229         .id_table               = ti_id_table_3410,
 230         .num_ports              = 1,
 231         .attach                 = ti_startup,
 232         .shutdown               = ti_shutdown,
 233         .open                   = ti_open,
 234         .close                  = ti_close,
 235         .write                  = ti_write,
 236         .write_room             = ti_write_room,
 237         .chars_in_buffer        = ti_chars_in_buffer,
 238         .throttle               = ti_throttle,
 239         .unthrottle             = ti_unthrottle,
 240         .ioctl                  = ti_ioctl,
 241         .set_termios            = ti_set_termios,
 242         .tiocmget               = ti_tiocmget,
 243         .tiocmset               = ti_tiocmset,
 244         .break_ctl              = ti_break,
 245         .read_int_callback      = ti_interrupt_callback,
 246         .read_bulk_callback     = ti_bulk_in_callback,
 247         .write_bulk_callback    = ti_bulk_out_callback,
 248 };
 249
 250 static struct usb_serial_driver ti_2port_device = {
 251         .driver = {
 252                 .owner          = THIS_MODULE,
 253                 .name           = "ti_usb_3410_5052_2",
 254         },
 255         .description            = "TI USB 5052 2 port adapter",
 256         .usb_driver             = &ti_usb_driver,
 257         .id_table               = ti_id_table_5052,
 258         .num_ports              = 2,
 259         .attach                 = ti_startup,
 260         .shutdown               = ti_shutdown,
 261         .open                   = ti_open,
 262         .close                  = ti_close,
 263         .write                  = ti_write,
 264         .write_room             = ti_write_room,
 265         .chars_in_buffer        = ti_chars_in_buffer,
 266         .throttle               = ti_throttle,
 267         .unthrottle             = ti_unthrottle,
 268         .ioctl                  = ti_ioctl,
 269         .set_termios            = ti_set_termios,
 270         .tiocmget               = ti_tiocmget,
 271         .tiocmset               = ti_tiocmset,
 272         .break_ctl              = ti_break,
 273         .read_int_callback      = ti_interrupt_callback,
 274         .read_bulk_callback     = ti_bulk_in_callback,
 275         .write_bulk_callback    = ti_bulk_out_callback,
 276 };
 277
 278
 279 /* Module */
 280
 281 MODULE_AUTHOR(TI_DRIVER_AUTHOR);
 282 MODULE_DESCRIPTION(TI_DRIVER_DESC);
 283 MODULE_VERSION(TI_DRIVER_VERSION);
 284 MODULE_LICENSE("GPL");
 285
 286 MODULE_FIRMWARE("ti_3410.fw");
 287 MODULE_FIRMWARE("ti_5052.fw");
 288 MODULE_FIRMWARE("mts_cdma.fw");
 289 MODULE_FIRMWARE("mts_gsm.fw");
 290 MODULE_FIRMWARE("mts_edge.fw");
 291
 292 module_param(debug, bool, S_IRUGO | S_IWUSR);
 293 MODULE_PARM_DESC(debug, "Enable debugging, 0=no, 1=yes");
 294
 295 module_param(low_latency, bool, S_IRUGO | S_IWUSR);
 296 MODULE_PARM_DESC(low_latency,
 297                 "TTY low_latency flag, 0=off, 1=on, default is off");
 298
 299 module_param(closing_wait, int, S_IRUGO | S_IWUSR);
 300 MODULE_PARM_DESC(closing_wait,
 301     "Maximum wait for data to drain in close, in .01 secs, default is 4000");
 302
 303 module_param_array(vendor_3410, ushort, &vendor_3410_count, S_IRUGO);
 304 MODULE_PARM_DESC(vendor_3410,
 305                 "Vendor ids for 3410 based devices, 1-5 short integers");
 306 module_param_array(product_3410, ushort, &product_3410_count, S_IRUGO);
 307 MODULE_PARM_DESC(product_3410,
 308                 "Product ids for 3410 based devices, 1-5 short integers");
 309 module_param_array(vendor_5052, ushort, &vendor_5052_count, S_IRUGO);
 310 MODULE_PARM_DESC(vendor_5052,
 311                 "Vendor ids for 5052 based devices, 1-5 short integers");
 312 module_param_array(product_5052, ushort, &product_5052_count, S_IRUGO);
 313 MODULE_PARM_DESC(product_5052,
 314                 "Product ids for 5052 based devices, 1-5 short integers");
 315
 316 MODULE_DEVICE_TABLE(usb, ti_id_table_combined);
 317
 318
 319 /* Functions */
 320
 321 static int __init ti_init(void)
 322 {
 323         int i, j, c;
 324         int ret;
 325
 326         /* insert extra vendor and product ids */
 327         c = ARRAY_SIZE(ti_id_table_combined) - 2 * TI_EXTRA_VID_PID_COUNT - 1;
 328         j = ARRAY_SIZE(ti_id_table_3410) - TI_EXTRA_VID_PID_COUNT - 1;
 329         for (i = 0; i < min(vendor_3410_count, product_3410_count); i++, j++, c++) {
 330                 ti_id_table_3410[j].idVendor = vendor_3410[i];
 331                 ti_id_table_3410[j].idProduct = product_3410[i];
 332                 ti_id_table_3410[j].match_flags = USB_DEVICE_ID_MATCH_DEVICE;
 333                 ti_id_table_combined[c].idVendor = vendor_3410[i];
 334                 ti_id_table_combined[c].idProduct = product_3410[i];
 335                 ti_id_table_combined[c].match_flags = USB_DEVICE_ID_MATCH_DEVICE;
 336         }
 337         j = ARRAY_SIZE(ti_id_table_5052) - TI_EXTRA_VID_PID_COUNT - 1;
 338         for (i = 0; i < min(vendor_5052_count, product_5052_count); i++, j++, c++) {
 339                 ti_id_table_5052[j].idVendor = vendor_5052[i];
 340                 ti_id_table_5052[j].idProduct = product_5052[i];
 341                 ti_id_table_5052[j].match_flags = USB_DEVICE_ID_MATCH_DEVICE;
 342                 ti_id_table_combined[c].idVendor = vendor_5052[i];
 343                 ti_id_table_combined[c].idProduct = product_5052[i];
 344                 ti_id_table_combined[c].match_flags = USB_DEVICE_ID_MATCH_DEVICE;
 345         }
 346
 347         ret = usb_serial_register(&ti_1port_device);
 348         if (ret)
 349                 goto failed_1port;
 350         ret = usb_serial_register(&ti_2port_device);
 351         if (ret)
 352                 goto failed_2port;
 353
 354         ret = usb_register(&ti_usb_driver);
 355         if (ret)
 356                 goto failed_usb;
 357
 358         printk(KERN_INFO KBUILD_MODNAME ": " TI_DRIVER_VERSION ":"
 359                TI_DRIVER_DESC "\n");
 360
 361         return 0;
 362
 363 failed_usb:
 364         usb_serial_deregister(&ti_2port_device);
 365 failed_2port:
 366         usb_serial_deregister(&ti_1port_device);
 367 failed_1port:
 368         return ret;
 369 }
 370
 371
 372 static void __exit ti_exit(void)
 373 {
 374         usb_serial_deregister(&ti_1port_device);
 375         usb_serial_deregister(&ti_2port_device);
 376         usb_deregister(&ti_usb_driver);
 377 }
 378
 379
 380 module_init(ti_init);
 381 module_exit(ti_exit);
 382
 383
 384 static int ti_startup(struct usb_serial *serial)
 385 {
 386         struct ti_device *tdev;
 387         struct ti_port *tport;
 388         struct usb_device *dev = serial->dev;
 389         int status;
 390         int i;
 391
 392
 393         dbg("%s - product 0x%4X, num configurations %d, configuration value %d",
 394             __func__, le16_to_cpu(dev->descriptor.idProduct),
 395             dev->descriptor.bNumConfigurations,
 396             dev->actconfig->desc.bConfigurationValue);
 397
 398         /* create device structure */
 399         tdev = kzalloc(sizeof(struct ti_device), GFP_KERNEL);
 400         if (tdev == NULL) {
 401                 dev_err(&dev->dev, "%s - out of memory\n", __func__);
 402                 return -ENOMEM;
 403         }
 404         mutex_init(&tdev->td_open_close_lock);
 405         tdev->td_serial = serial;
 406         usb_set_serial_data(serial, tdev);
 407
 408         /* determine device type */
 409         if (usb_match_id(serial->interface, ti_id_table_3410))
 410                 tdev->td_is_3410 = 1;
 411         dbg("%s - device type is %s", __func__,
 412                                 tdev->td_is_3410 ? "3410" : "5052");
 413
 414         /* if we have only 1 configuration, download firmware */
 415         if (dev->descriptor.bNumConfigurations == 1) {
 416                 if ((status = ti_download_firmware(tdev)) != 0)
 417                         goto free_tdev;
 418
 419                 /* 3410 must be reset, 5052 resets itself */
 420                 if (tdev->td_is_3410) {
 421                         msleep_interruptible(100);
 422                         usb_reset_device(dev);
 423                 }
 424
 425                 status = -ENODEV;
 426                 goto free_tdev;
 427         }
 428
 429         /* the second configuration must be set */
 430         if (dev->actconfig->desc.bConfigurationValue == TI_BOOT_CONFIG) {
 431                 status = usb_driver_set_configuration(dev, TI_ACTIVE_CONFIG);
 432                 status = status ? status : -ENODEV;
 433                 goto free_tdev;
 434         }
 435
 436         /* set up port structures */
 437         for (i = 0; i < serial->num_ports; ++i) {
 438                 tport = kzalloc(sizeof(struct ti_port), GFP_KERNEL);
 439                 if (tport == NULL) {
 440                         dev_err(&dev->dev, "%s - out of memory\n", __func__);
 441                         status = -ENOMEM;
 442                         goto free_tports;
 443                 }
 444                 spin_lock_init(&tport->tp_lock);
 445                 tport->tp_uart_base_addr = (i == 0 ?
 446                                 TI_UART1_BASE_ADDR : TI_UART2_BASE_ADDR);
 447                 tport->tp_flags = low_latency ? ASYNC_LOW_LATENCY : 0;
 448                 tport->tp_closing_wait = closing_wait;
 449                 init_waitqueue_head(&tport->tp_msr_wait);
 450                 init_waitqueue_head(&tport->tp_write_wait);
 451                 tport->tp_write_buf = ti_buf_alloc();
 452                 if (tport->tp_write_buf == NULL) {
 453                         dev_err(&dev->dev, "%s - out of memory\n", __func__);
 454                         kfree(tport);
 455                         status = -ENOMEM;
 456                         goto free_tports;
 457                 }
 458                 tport->tp_port = serial->port[i];
 459                 tport->tp_tdev = tdev;
 460                 usb_set_serial_port_data(serial->port[i], tport);
 461                 tport->tp_uart_mode = 0;        /* default is RS232 */
 462         }
 463
 464         return 0;
 465
 466 free_tports:
 467         for (--i; i >= 0; --i) {
 468                 tport = usb_get_serial_port_data(serial->port[i]);
 469                 ti_buf_free(tport->tp_write_buf);
 470                 kfree(tport);
 471                 usb_set_serial_port_data(serial->port[i], NULL);
 472         }
 473 free_tdev:
 474         kfree(tdev);
 475         usb_set_serial_data(serial, NULL);
 476         return status;
 477 }
 478
 479
 480 static void ti_shutdown(struct usb_serial *serial)
 481 {
 482         int i;
 483         struct ti_device *tdev = usb_get_serial_data(serial);
 484         struct ti_port *tport;
 485
 486         dbg("%s", __func__);
 487
 488         for (i = 0; i < serial->num_ports; ++i) {
 489                 tport = usb_get_serial_port_data(serial->port[i]);
 490                 if (tport) {
 491                         ti_buf_free(tport->tp_write_buf);
 492                         kfree(tport);
 493                         usb_set_serial_port_data(serial->port[i], NULL);
 494                 }
 495         }
 496
 497         kfree(tdev);
 498         usb_set_serial_data(serial, NULL);
 499 }
 500
 501
 502 static int ti_open(struct tty_struct *tty,
 503                         struct usb_serial_port *port, struct file *file)
 504 {
 505         struct ti_port *tport = usb_get_serial_port_data(port);
 506         struct ti_device *tdev;
 507         struct usb_device *dev;
 508         struct urb *urb;
 509         int port_number;
 510         int status;
 511         __u16 open_settings = (__u8)(TI_PIPE_MODE_CONTINOUS |
 512                              TI_PIPE_TIMEOUT_ENABLE |
 513                              (TI_TRANSFER_TIMEOUT << 2));
 514
 515         dbg("%s - port %d", __func__, port->number);
 516
 517         if (tport == NULL)
 518                 return -ENODEV;
 519
 520         dev = port->serial->dev;
 521         tdev = tport->tp_tdev;
 522
 523         /* only one open on any port on a device at a time */
 524         if (mutex_lock_interruptible(&tdev->td_open_close_lock))
 525                 return -ERESTARTSYS;
 526
 527         if (tty)
 528                 tty->low_latency =
 529                                 (tport->tp_flags & ASYNC_LOW_LATENCY) ? 1 : 0;
 530
 531         port_number = port->number - port->serial->minor;
 532
 533         memset(&(tport->tp_icount), 0x00, sizeof(tport->tp_icount));
 534
 535         tport->tp_msr = 0;
 536         tport->tp_shadow_mcr |= (TI_MCR_RTS | TI_MCR_DTR);
 537
 538         /* start interrupt urb the first time a port is opened on this device */
 539         if (tdev->td_open_port_count == 0) {
 540                 dbg("%s - start interrupt in urb", __func__);
 541                 urb = tdev->td_serial->port[0]->interrupt_in_urb;
 542                 if (!urb) {
 543                         dev_err(&port->dev, "%s - no interrupt urb\n",
 544                                                                 __func__);
 545                         status = -EINVAL;
 546                         goto release_lock;
 547                 }
 548                 urb->complete = ti_interrupt_callback;
 549                 urb->context = tdev;
 550                 urb->dev = dev;
 551                 status = usb_submit_urb(urb, GFP_KERNEL);
 552                 if (status) {
 553                         dev_err(&port->dev,
 554                                 "%s - submit interrupt urb failed, %d\n",
 555                                         __func__, status);
 556                         goto release_lock;
 557                 }
 558         }
 559
 560         if (tty)
 561                 ti_set_termios(tty, port, tty->termios);
 562
 563         dbg("%s - sending TI_OPEN_PORT", __func__);
 564         status = ti_command_out_sync(tdev, TI_OPEN_PORT,
 565                 (__u8)(TI_UART1_PORT + port_number), open_settings, NULL, 0);
 566         if (status) {
 567                 dev_err(&port->dev, "%s - cannot send open command, %d\n",
 568                                                         __func__, status);
 569                 goto unlink_int_urb;
 570         }
 571
 572         dbg("%s - sending TI_START_PORT", __func__);
 573         status = ti_command_out_sync(tdev, TI_START_PORT,
 574                 (__u8)(TI_UART1_PORT + port_number), 0, NULL, 0);
 575         if (status) {
 576                 dev_err(&port->dev, "%s - cannot send start command, %d\n",
 577                                                         __func__, status);
 578                 goto unlink_int_urb;
 579         }
 580
 581         dbg("%s - sending TI_PURGE_PORT", __func__);
 582         status = ti_command_out_sync(tdev, TI_PURGE_PORT,
 583                 (__u8)(TI_UART1_PORT + port_number), TI_PURGE_INPUT, NULL, 0);
 584         if (status) {
 585                 dev_err(&port->dev, "%s - cannot clear input buffers, %d\n",
 586                                                         __func__, status);
 587                 goto unlink_int_urb;
 588         }
 589         status = ti_command_out_sync(tdev, TI_PURGE_PORT,
 590                 (__u8)(TI_UART1_PORT + port_number), TI_PURGE_OUTPUT, NULL, 0);
 591         if (status) {
 592                 dev_err(&port->dev, "%s - cannot clear output buffers, %d\n",
 593                                                         __func__, status);
 594                 goto unlink_int_urb;
 595         }
 596
 597         /* reset the data toggle on the bulk endpoints to work around bug in
 598          * host controllers where things get out of sync some times */
 599         usb_clear_halt(dev, port->write_urb->pipe);
 600         usb_clear_halt(dev, port->read_urb->pipe);
 601
 602         if (tty)
 603                 ti_set_termios(tty, port, tty->termios);
 604
 605         dbg("%s - sending TI_OPEN_PORT (2)", __func__);
 606         status = ti_command_out_sync(tdev, TI_OPEN_PORT,
 607                 (__u8)(TI_UART1_PORT + port_number), open_settings, NULL, 0);
 608         if (status) {
 609                 dev_err(&port->dev, "%s - cannot send open command (2), %d\n",
 610                                                         __func__, status);
 611                 goto unlink_int_urb;
 612         }
 613
 614         dbg("%s - sending TI_START_PORT (2)", __func__);
 615         status = ti_command_out_sync(tdev, TI_START_PORT,
 616                 (__u8)(TI_UART1_PORT + port_number), 0, NULL, 0);
 617         if (status) {
 618                 dev_err(&port->dev, "%s - cannot send start command (2), %d\n",
 619                                                         __func__, status);
 620                 goto unlink_int_urb;
 621         }
 622
 623         /* start read urb */
 624         dbg("%s - start read urb", __func__);
 625         urb = port->read_urb;
 626         if (!urb) {
 627                 dev_err(&port->dev, "%s - no read urb\n", __func__);
 628                 status = -EINVAL;
 629                 goto unlink_int_urb;
 630         }
 631         tport->tp_read_urb_state = TI_READ_URB_RUNNING;
 632         urb->complete = ti_bulk_in_callback;
 633         urb->context = tport;
 634         urb->dev = dev;
 635         status = usb_submit_urb(urb, GFP_KERNEL);
 636         if (status) {
 637                 dev_err(&port->dev, "%s - submit read urb failed, %d\n",
 638                                                         __func__, status);
 639                 goto unlink_int_urb;
 640         }
 641
 642         tport->tp_is_open = 1;
 643         ++tdev->td_open_port_count;
 644
 645         goto release_lock;
 646
 647 unlink_int_urb:
 648         if (tdev->td_open_port_count == 0)
 649                 usb_kill_urb(port->serial->port[0]->interrupt_in_urb);
 650 release_lock:
 651         mutex_unlock(&tdev->td_open_close_lock);
 652         dbg("%s - exit %d", __func__, status);
 653         return status;
 654 }
 655
 656
 657 static void ti_close(struct tty_struct *tty, struct usb_serial_port *port,
 658                                                         struct file *file)
 659 {
 660         struct ti_device *tdev;
 661         struct ti_port *tport;
 662         int port_number;
 663         int status;
 664         int do_unlock;
 665
 666         dbg("%s - port %d", __func__, port->number);
 667
 668         tdev = usb_get_serial_data(port->serial);
 669         tport = usb_get_serial_port_data(port);
 670         if (tdev == NULL || tport == NULL)
 671                 return;
 672
 673         tport->tp_is_open = 0;
 674
 675         ti_drain(tport, (tport->tp_closing_wait*HZ)/100, 1);
 676
 677         usb_kill_urb(port->read_urb);
 678         usb_kill_urb(port->write_urb);
 679         tport->tp_write_urb_in_use = 0;
 680
 681         port_number = port->number - port->serial->minor;
 682
 683         dbg("%s - sending TI_CLOSE_PORT", __func__);
 684         status = ti_command_out_sync(tdev, TI_CLOSE_PORT,
 685                      (__u8)(TI_UART1_PORT + port_number), 0, NULL, 0);
 686         if (status)
 687                 dev_err(&port->dev,
 688                         "%s - cannot send close port command, %d\n"
 689                                                         , __func__, status);
 690
 691         /* if mutex_lock is interrupted, continue anyway */
 692         do_unlock = !mutex_lock_interruptible(&tdev->td_open_close_lock);
 693         --tport->tp_tdev->td_open_port_count;
 694         if (tport->tp_tdev->td_open_port_count <= 0) {
 695                 /* last port is closed, shut down interrupt urb */
 696                 usb_kill_urb(port->serial->port[0]->interrupt_in_urb);
 697                 tport->tp_tdev->td_open_port_count = 0;
 698         }
 699         if (do_unlock)
 700                 mutex_unlock(&tdev->td_open_close_lock);
 701
 702         dbg("%s - exit", __func__);
 703 }
 704
 705
 706 static int ti_write(struct tty_struct *tty, struct usb_serial_port *port,
 707                         const unsigned char *data, int count)
 708 {
 709         struct ti_port *tport = usb_get_serial_port_data(port);
 710         unsigned long flags;
 711
 712         dbg("%s - port %d", __func__, port->number);
 713
 714         if (count == 0) {
 715                 dbg("%s - write request of 0 bytes", __func__);
 716                 return 0;
 717         }
 718
 719         if (tport == NULL || !tport->tp_is_open)
 720                 return -ENODEV;
 721
 722         spin_lock_irqsave(&tport->tp_lock, flags);
 723         count = ti_buf_put(tport->tp_write_buf, data, count);
 724         spin_unlock_irqrestore(&tport->tp_lock, flags);
 725
 726         ti_send(tport);
 727
 728         return count;
 729 }
 730
 731
 732 static int ti_write_room(struct tty_struct *tty)
 733 {
 734         struct usb_serial_port *port = tty->driver_data;
 735         struct ti_port *tport = usb_get_serial_port_data(port);
 736         int room = 0;
 737         unsigned long flags;
 738
 739         dbg("%s - port %d", __func__, port->number);
 740
 741         if (tport == NULL)
 742                 return -ENODEV;
 743
 744         spin_lock_irqsave(&tport->tp_lock, flags);
 745         room = ti_buf_space_avail(tport->tp_write_buf);
 746         spin_unlock_irqrestore(&tport->tp_lock, flags);
 747
 748         dbg("%s - returns %d", __func__, room);
 749         return room;
 750 }
 751
 752
 753 static int ti_chars_in_buffer(struct tty_struct *tty)
 754 {
 755         struct usb_serial_port *port = tty->driver_data;
 756         struct ti_port *tport = usb_get_serial_port_data(port);
 757         int chars = 0;
 758         unsigned long flags;
 759
 760         dbg("%s - port %d", __func__, port->number);
 761
 762         if (tport == NULL)
 763                 return -ENODEV;
 764
 765         spin_lock_irqsave(&tport->tp_lock, flags);
 766         chars = ti_buf_data_avail(tport->tp_write_buf);
 767         spin_unlock_irqrestore(&tport->tp_lock, flags);
 768
 769         dbg("%s - returns %d", __func__, chars);
 770         return chars;
 771 }
 772
 773
 774 static void ti_throttle(struct tty_struct *tty)
 775 {
 776         struct usb_serial_port *port = tty->driver_data;
 777         struct ti_port *tport = usb_get_serial_port_data(port);
 778
 779         dbg("%s - port %d", __func__, port->number);
 780
 781         if (tport == NULL)
 782                 return;
 783
 784         if (I_IXOFF(tty) || C_CRTSCTS(tty))
 785                 ti_stop_read(tport, tty);
 786
 787 }
 788
 789
 790 static void ti_unthrottle(struct tty_struct *tty)
 791 {
 792         struct usb_serial_port *port = tty->driver_data;
 793         struct ti_port *tport = usb_get_serial_port_data(port);
 794         int status;
 795
 796         dbg("%s - port %d", __func__, port->number);
 797
 798         if (tport == NULL)
 799                 return;
 800
 801         if (I_IXOFF(tty) || C_CRTSCTS(tty)) {
 802                 status = ti_restart_read(tport, tty);
 803                 if (status)
 804                         dev_err(&port->dev, "%s - cannot restart read, %d\n",
 805                                                         __func__, status);
 806         }
 807 }
 808
 809
 810 static int ti_ioctl(struct tty_struct *tty, struct file *file,
 811         unsigned int cmd, unsigned long arg)
 812 {
 813         struct usb_serial_port *port = tty->driver_data;
 814         struct ti_port *tport = usb_get_serial_port_data(port);
 815         struct async_icount cnow;
 816         struct async_icount cprev;
 817
 818         dbg("%s - port %d, cmd = 0x%04X", __func__, port->number, cmd);
 819
 820         if (tport == NULL)
 821                 return -ENODEV;
 822
 823         switch (cmd) {
 824         case TIOCGSERIAL:
 825                 dbg("%s - (%d) TIOCGSERIAL", __func__, port->number);
 826                 return ti_get_serial_info(tport,
 827                                 (struct serial_struct __user *)arg);
 828         case TIOCSSERIAL:
 829                 dbg("%s - (%d) TIOCSSERIAL", __func__, port->number);
 830                 return ti_set_serial_info(tty, tport,
 831                                 (struct serial_struct __user *)arg);
 832         case TIOCMIWAIT:
 833                 dbg("%s - (%d) TIOCMIWAIT", __func__, port->number);
 834                 cprev = tport->tp_icount;
 835                 while (1) {
 836                         interruptible_sleep_on(&tport->tp_msr_wait);
 837                         if (signal_pending(current))
 838                                 return -ERESTARTSYS;
 839                         cnow = tport->tp_icount;
 840                         if (cnow.rng == cprev.rng && cnow.dsr == cprev.dsr &&
 841                             cnow.dcd == cprev.dcd && cnow.cts == cprev.cts)
 842                                 return -EIO; /* no change => error */
 843                         if (((arg & TIOCM_RNG) && (cnow.rng != cprev.rng)) ||
 844                             ((arg & TIOCM_DSR) && (cnow.dsr != cprev.dsr)) ||
 845                             ((arg & TIOCM_CD)  && (cnow.dcd != cprev.dcd)) ||
 846                             ((arg & TIOCM_CTS) && (cnow.cts != cprev.cts)))
 847                                 return 0;
 848                         cprev = cnow;
 849                 }
 850                 break;
 851         case TIOCGICOUNT:
 852                 dbg("%s - (%d) TIOCGICOUNT RX=%d, TX=%d",
 853                                 __func__, port->number,
 854                                 tport->tp_icount.rx, tport->tp_icount.tx);
 855                 if (copy_to_user((void __user *)arg, &tport->tp_icount,
 856                                         sizeof(tport->tp_icount)))
 857                         return -EFAULT;
 858                 return 0;
 859         }
 860         return -ENOIOCTLCMD;
 861 }
 862
 863
 864 static void ti_set_termios(struct tty_struct *tty,
 865                 struct usb_serial_port *port, struct ktermios *old_termios)
 866 {
 867         struct ti_port *tport = usb_get_serial_port_data(port);
 868         struct ti_uart_config *config;
 869         tcflag_t cflag, iflag;
 870         int baud;
 871         int status;
 872         int port_number = port->number - port->serial->minor;
 873         unsigned int mcr;
 874
 875         dbg("%s - port %d", __func__, port->number);
 876
 877         cflag = tty->termios->c_cflag;
 878         iflag = tty->termios->c_iflag;
 879
 880         dbg("%s - cflag %08x, iflag %08x", __func__, cflag, iflag);
 881         dbg("%s - old clfag %08x, old iflag %08x", __func__,
 882                                 old_termios->c_cflag, old_termios->c_iflag);
 883
 884         if (tport == NULL)
 885                 return;
 886
 887         config = kmalloc(sizeof(*config), GFP_KERNEL);
 888         if (!config) {
 889                 dev_err(&port->dev, "%s - out of memory\n", __func__);
 890                 return;
 891         }
 892
 893         config->wFlags = 0;
 894
 895         /* these flags must be set */
 896         config->wFlags |= TI_UART_ENABLE_MS_INTS;
 897         config->wFlags |= TI_UART_ENABLE_AUTO_START_DMA;
 898         config->bUartMode = (__u8)(tport->tp_uart_mode);
 899
 900         switch (cflag & CSIZE) {
 901         case CS5:
 902                     config->bDataBits = TI_UART_5_DATA_BITS;
 903                     break;
 904         case CS6:
 905                     config->bDataBits = TI_UART_6_DATA_BITS;
 906                     break;
 907         case CS7:
 908                     config->bDataBits = TI_UART_7_DATA_BITS;
 909                     break;
 910         default:
 911         case CS8:
 912                     config->bDataBits = TI_UART_8_DATA_BITS;
 913                     break;
 914         }
 915
 916         /* CMSPAR isn't supported by this driver */
 917         tty->termios->c_cflag &= ~CMSPAR;
 918
 919         if (cflag & PARENB) {
 920                 if (cflag & PARODD) {
 921                         config->wFlags |= TI_UART_ENABLE_PARITY_CHECKING;
 922                         config->bParity = TI_UART_ODD_PARITY;
 923                 } else {
 924                         config->wFlags |= TI_UART_ENABLE_PARITY_CHECKING;
 925                         config->bParity = TI_UART_EVEN_PARITY;
 926                 }
 927         } else {
 928                 config->wFlags &= ~TI_UART_ENABLE_PARITY_CHECKING;
 929                 config->bParity = TI_UART_NO_PARITY;
 930         }
 931
 932         if (cflag & CSTOPB)
 933                 config->bStopBits = TI_UART_2_STOP_BITS;
 934         else
 935                 config->bStopBits = TI_UART_1_STOP_BITS;
 936
 937         if (cflag & CRTSCTS) {
 938                 /* RTS flow control must be off to drop RTS for baud rate B0 */
 939                 if ((cflag & CBAUD) != B0)
 940                         config->wFlags |= TI_UART_ENABLE_RTS_IN;
 941                 config->wFlags |= TI_UART_ENABLE_CTS_OUT;
 942         } else {
 943                 tty->hw_stopped = 0;
 944                 ti_restart_read(tport, tty);
 945         }
 946
 947         if (I_IXOFF(tty) || I_IXON(tty)) {
 948                 config->cXon  = START_CHAR(tty);
 949                 config->cXoff = STOP_CHAR(tty);
 950
 951                 if (I_IXOFF(tty))
 952                         config->wFlags |= TI_UART_ENABLE_X_IN;
 953                 else
 954                         ti_restart_read(tport, tty);
 955
 956                 if (I_IXON(tty))
 957                         config->wFlags |= TI_UART_ENABLE_X_OUT;
 958         }
 959
 960         baud = tty_get_baud_rate(tty);
 961         if (!baud)
 962                 baud = 9600;
 963         if (tport->tp_tdev->td_is_3410)
 964                 config->wBaudRate = (__u16)((923077 + baud/2) / baud);
 965         else
 966                 config->wBaudRate = (__u16)((461538 + baud/2) / baud);
 967
 968         /* FIXME: Should calculate resulting baud here and report it back */
 969         if ((cflag & CBAUD) != B0)
 970                 tty_encode_baud_rate(tty, baud, baud);
 971
 972         dbg("%s - BaudRate=%d, wBaudRate=%d, wFlags=0x%04X, bDataBits=%d, bParity=%d, bStopBits=%d, cXon=%d, cXoff=%d, bUartMode=%d",
 973         __func__, baud, config->wBaudRate, config->wFlags, config->bDataBits, config->bParity, config->bStopBits, config->cXon, config->cXoff, config->bUartMode);
 974
 975         cpu_to_be16s(&config->wBaudRate);
 976         cpu_to_be16s(&config->wFlags);
 977
 978         status = ti_command_out_sync(tport->tp_tdev, TI_SET_CONFIG,
 979                 (__u8)(TI_UART1_PORT + port_number), 0, (__u8 *)config,
 980                 sizeof(*config));
 981         if (status)
 982                 dev_err(&port->dev, "%s - cannot set config on port %d, %d\n",
 983                                         __func__, port_number, status);
 984
 985         /* SET_CONFIG asserts RTS and DTR, reset them correctly */
 986         mcr = tport->tp_shadow_mcr;
 987         /* if baud rate is B0, clear RTS and DTR */
 988         if ((cflag & CBAUD) == B0)
 989                 mcr &= ~(TI_MCR_DTR | TI_MCR_RTS);
 990         status = ti_set_mcr(tport, mcr);
 991         if (status)
 992                 dev_err(&port->dev,
 993                         "%s - cannot set modem control on port %d, %d\n",
 994                                                 __func__, port_number, status);
 995
 996         kfree(config);
 997 }
 998
 999
1000 static int ti_tiocmget(struct tty_struct *tty, struct file *file)
1001 {
1002         struct usb_serial_port *port = tty->driver_data;
1003         struct ti_port *tport = usb_get_serial_port_data(port);
1004         unsigned int result;
1005         unsigned int msr;
1006         unsigned int mcr;
1007         unsigned long flags;
1008
1009         dbg("%s - port %d", __func__, port->number);
1010
1011         if (tport == NULL)
1012                 return -ENODEV;
1013
1014         spin_lock_irqsave(&tport->tp_lock, flags);
1015         msr = tport->tp_msr;
1016         mcr = tport->tp_shadow_mcr;
1017         spin_unlock_irqrestore(&tport->tp_lock, flags);
1018
1019         result = ((mcr & TI_MCR_DTR) ? TIOCM_DTR : 0)
1020                 | ((mcr & TI_MCR_RTS) ? TIOCM_RTS : 0)
1021                 | ((mcr & TI_MCR_LOOP) ? TIOCM_LOOP : 0)
1022                 | ((msr & TI_MSR_CTS) ? TIOCM_CTS : 0)
1023                 | ((msr & TI_MSR_CD) ? TIOCM_CAR : 0)
1024                 | ((msr & TI_MSR_RI) ? TIOCM_RI : 0)
1025                 | ((msr & TI_MSR_DSR) ? TIOCM_DSR : 0);
1026
1027         dbg("%s - 0x%04X", __func__, result);
1028
1029         return result;
1030 }
1031
1032
1033 static int ti_tiocmset(struct tty_struct *tty, struct file *file,
1034         unsigned int set, unsigned int clear)
1035 {
1036         struct usb_serial_port *port = tty->driver_data;
1037         struct ti_port *tport = usb_get_serial_port_data(port);
1038         unsigned int mcr;
1039         unsigned long flags;
1040
1041         dbg("%s - port %d", __func__, port->number);
1042
1043         if (tport == NULL)
1044                 return -ENODEV;
1045
1046         spin_lock_irqsave(&tport->tp_lock, flags);
1047         mcr = tport->tp_shadow_mcr;
1048
1049         if (set & TIOCM_RTS)
1050                 mcr |= TI_MCR_RTS;
1051         if (set & TIOCM_DTR)
1052                 mcr |= TI_MCR_DTR;
1053         if (set & TIOCM_LOOP)
1054                 mcr |= TI_MCR_LOOP;
1055
1056         if (clear & TIOCM_RTS)
1057                 mcr &= ~TI_MCR_RTS;
1058         if (clear & TIOCM_DTR)
1059                 mcr &= ~TI_MCR_DTR;
1060         if (clear & TIOCM_LOOP)
1061                 mcr &= ~TI_MCR_LOOP;
1062         spin_unlock_irqrestore(&tport->tp_lock, flags);
1063
1064         return ti_set_mcr(tport, mcr);
1065 }
1066
1067
1068 static void ti_break(struct tty_struct *tty, int break_state)
1069 {
1070         struct usb_serial_port *port = tty->driver_data;
1071         struct ti_port *tport = usb_get_serial_port_data(port);
1072         int status;
1073
1074         dbg("%s - state = %d", __func__, break_state);
1075
1076         if (tport == NULL)
1077                 return;
1078
1079         ti_drain(tport, (tport->tp_closing_wait*HZ)/100, 0);
1080
1081         status = ti_write_byte(tport->tp_tdev,
1082                 tport->tp_uart_base_addr + TI_UART_OFFSET_LCR,
1083                 TI_LCR_BREAK, break_state == -1 ? TI_LCR_BREAK : 0);
1084
1085         if (status)
1086                 dbg("%s - error setting break, %d", __func__, status);
1087 }
1088
1089
1090 static void ti_interrupt_callback(struct urb *urb)
1091 {
1092         struct ti_device *tdev = urb->context;
1093         struct usb_serial_port *port;
1094         struct usb_serial *serial = tdev->td_serial;
1095         struct ti_port *tport;
1096         struct device *dev = &urb->dev->dev;
1097         unsigned char *data = urb->transfer_buffer;
1098         int length = urb->actual_length;
1099         int port_number;
1100         int function;
1101         int status = urb->status;
1102         int retval;
1103         __u8 msr;
1104
1105         dbg("%s", __func__);
1106
1107         switch (status) {
1108         case 0:
1109                 break;
1110         case -ECONNRESET:
1111         case -ENOENT:
1112         case -ESHUTDOWN:
1113                 dbg("%s - urb shutting down, %d", __func__, status);
1114                 tdev->td_urb_error = 1;
1115                 return;
1116         default:
1117                 dev_err(dev, "%s - nonzero urb status, %d\n",
1118                         __func__, status);
1119                 tdev->td_urb_error = 1;
1120                 goto exit;
1121         }
1122
1123         if (length != 2) {
1124                 dbg("%s - bad packet size, %d", __func__, length);
1125                 goto exit;
1126         }
1127
1128         if (data[0] == TI_CODE_HARDWARE_ERROR) {
1129                 dev_err(dev, "%s - hardware error, %d\n", __func__, data[1]);
1130                 goto exit;
1131         }
1132
1133         port_number = TI_GET_PORT_FROM_CODE(data[0]);
1134         function = TI_GET_FUNC_FROM_CODE(data[0]);
1135
1136         dbg("%s - port_number %d, function %d, data 0x%02X",
1137                                 __func__, port_number, function, data[1]);
1138
1139         if (port_number >= serial->num_ports) {
1140                 dev_err(dev, "%s - bad port number, %d\n",
1141                                                 __func__, port_number);
1142                 goto exit;
1143         }
1144
1145         port = serial->port[port_number];
1146
1147         tport = usb_get_serial_port_data(port);
1148         if (!tport)
1149                 goto exit;
1150
1151         switch (function) {
1152         case TI_CODE_DATA_ERROR:
1153                 dev_err(dev, "%s - DATA ERROR, port %d, data 0x%02X\n",
1154                                         __func__, port_number, data[1]);
1155                 break;
1156
1157         case TI_CODE_MODEM_STATUS:
1158                 msr = data[1];
1159                 dbg("%s - port %d, msr 0x%02X", __func__, port_number, msr);
1160                 ti_handle_new_msr(tport, msr);
1161                 break;
1162
1163         default:
1164                 dev_err(dev, "%s - unknown interrupt code, 0x%02X\n",
1165                                                         __func__, data[1]);
1166                 break;
1167         }
1168
1169 exit:
1170         retval = usb_submit_urb(urb, GFP_ATOMIC);
1171         if (retval)
1172                 dev_err(dev, "%s - resubmit interrupt urb failed, %d\n",
1173                         __func__, retval);
1174 }
1175
1176
1177 static void ti_bulk_in_callback(struct urb *urb)
1178 {
1179         struct ti_port *tport = urb->context;
1180         struct usb_serial_port *port = tport->tp_port;
1181         struct device *dev = &urb->dev->dev;
1182         int status = urb->status;
1183         int retval = 0;
1184         struct tty_struct *tty;
1185
1186         dbg("%s", __func__);
1187
1188         switch (status) {
1189         case 0:
1190                 break;
1191         case -ECONNRESET:
1192         case -ENOENT:
1193         case -ESHUTDOWN:
1194                 dbg("%s - urb shutting down, %d", __func__, status);
1195                 tport->tp_tdev->td_urb_error = 1;
1196                 wake_up_interruptible(&tport->tp_write_wait);
1197                 return;
1198         default:
1199                 dev_err(dev, "%s - nonzero urb status, %d\n",
1200                         __func__, status);
1201                 tport->tp_tdev->td_urb_error = 1;
1202                 wake_up_interruptible(&tport->tp_write_wait);
1203         }
1204
1205         if (status == -EPIPE)
1206                 goto exit;
1207
1208         if (status) {
1209                 dev_err(dev, "%s - stopping read!\n", __func__);
1210                 return;
1211         }
1212
1213         tty = tty_port_tty_get(&port->port);
1214         if (tty && urb->actual_length) {
1215                 usb_serial_debug_data(debug, dev, __func__,
1216                         urb->actual_length, urb->transfer_buffer);
1217
1218                 if (!tport->tp_is_open)
1219                         dbg("%s - port closed, dropping data", __func__);
1220                 else
1221                         ti_recv(&urb->dev->dev, tty,
1222                                                 urb->transfer_buffer,
1223                                                 urb->actual_length);
1224
1225                 spin_lock(&tport->tp_lock);
1226                 tport->tp_icount.rx += urb->actual_length;
1227                 spin_unlock(&tport->tp_lock);
1228                 tty_kref_put(tty);
1229         }
1230
1231 exit:
1232         /* continue to read unless stopping */
1233         spin_lock(&tport->tp_lock);
1234         if (tport->tp_read_urb_state == TI_READ_URB_RUNNING) {
1235                 urb->dev = port->serial->dev;
1236                 retval = usb_submit_urb(urb, GFP_ATOMIC);
1237         } else if (tport->tp_read_urb_state == TI_READ_URB_STOPPING) {
1238                 tport->tp_read_urb_state = TI_READ_URB_STOPPED;
1239         }
1240         spin_unlock(&tport->tp_lock);
1241         if (retval)
1242                 dev_err(dev, "%s - resubmit read urb failed, %d\n",
1243                         __func__, retval);
1244 }
1245
1246
1247 static void ti_bulk_out_callback(struct urb *urb)
1248 {
1249         struct ti_port *tport = urb->context;
1250         struct usb_serial_port *port = tport->tp_port;
1251         struct device *dev = &urb->dev->dev;
1252         int status = urb->status;
1253
1254         dbg("%s - port %d", __func__, port->number);
1255
1256         tport->tp_write_urb_in_use = 0;
1257
1258         switch (status) {
1259         case 0:
1260                 break;
1261         case -ECONNRESET:
1262         case -ENOENT:
1263         case -ESHUTDOWN:
1264                 dbg("%s - urb shutting down, %d", __func__, status);
1265                 tport->tp_tdev->td_urb_error = 1;
1266                 wake_up_interruptible(&tport->tp_write_wait);
1267                 return;
1268         default:
1269                 dev_err(dev, "%s - nonzero urb status, %d\n",
1270                         __func__, status);
1271                 tport->tp_tdev->td_urb_error = 1;
1272                 wake_up_interruptible(&tport->tp_write_wait);
1273         }
1274
1275         /* send any buffered data */
1276         ti_send(tport);
1277 }
1278
1279
1280 static void ti_recv(struct device *dev, struct tty_struct *tty,
1281         unsigned char *data, int length)
1282 {
1283         int cnt;
1284
1285         do {
1286                 cnt = tty_buffer_request_room(tty, length);
1287                 if (cnt < length) {
1288                         dev_err(dev, "%s - dropping data, %d bytes lost\n",
1289                                                 __func__, length - cnt);
1290                         if (cnt == 0)
1291                                 break;
1292                 }
1293                 tty_insert_flip_string(tty, data, cnt);
1294                 tty_flip_buffer_push(tty);
1295                 data += cnt;
1296                 length -= cnt;
1297         } while (length > 0);
1298
1299 }
1300
1301
1302 static void ti_send(struct ti_port *tport)
1303 {
1304         int count, result;
1305         struct usb_serial_port *port = tport->tp_port;
1306         struct tty_struct *tty = tty_port_tty_get(&port->port); /* FIXME */
1307         unsigned long flags;
1308
1309
1310         dbg("%s - port %d", __func__, port->number);
1311
1312         spin_lock_irqsave(&tport->tp_lock, flags);
1313
1314         if (tport->tp_write_urb_in_use)
1315                 goto unlock;
1316
1317         count = ti_buf_get(tport->tp_write_buf,
1318                                 port->write_urb->transfer_buffer,
1319                                 port->bulk_out_size);
1320
1321         if (count == 0)
1322                 goto unlock;
1323
1324         tport->tp_write_urb_in_use = 1;
1325
1326         spin_unlock_irqrestore(&tport->tp_lock, flags);
1327
1328         usb_serial_debug_data(debug, &port->dev, __func__, count,
1329                                         port->write_urb->transfer_buffer);
1330
1331         usb_fill_bulk_urb(port->write_urb, port->serial->dev,
1332                            usb_sndbulkpipe(port->serial->dev,
1333                                             port->bulk_out_endpointAddress),
1334                            port->write_urb->transfer_buffer, count,
1335                            ti_bulk_out_callback, tport);
1336
1337         result = usb_submit_urb(port->write_urb, GFP_ATOMIC);
1338         if (result) {
1339                 dev_err(&port->dev, "%s - submit write urb failed, %d\n",
1340                                                         __func__, result);
1341                 tport->tp_write_urb_in_use = 0;
1342                 /* TODO: reschedule ti_send */
1343         } else {
1344                 spin_lock_irqsave(&tport->tp_lock, flags);
1345                 tport->tp_icount.tx += count;
1346                 spin_unlock_irqrestore(&tport->tp_lock, flags);
1347         }
1348
1349         /* more room in the buffer for new writes, wakeup */
1350         if (tty)
1351                 tty_wakeup(tty);
1352         tty_kref_put(tty);
1353         wake_up_interruptible(&tport->tp_write_wait);
1354         return;
1355 unlock:
1356         spin_unlock_irqrestore(&tport->tp_lock, flags);
1357         tty_kref_put(tty);
1358         return;
1359 }
1360
1361
1362 static int ti_set_mcr(struct ti_port *tport, unsigned int mcr)
1363 {
1364         unsigned long flags;
1365         int status;
1366
1367         status = ti_write_byte(tport->tp_tdev,
1368                 tport->tp_uart_base_addr + TI_UART_OFFSET_MCR,
1369                 TI_MCR_RTS | TI_MCR_DTR | TI_MCR_LOOP, mcr);
1370
1371         spin_lock_irqsave(&tport->tp_lock, flags);
1372         if (!status)
1373                 tport->tp_shadow_mcr = mcr;
1374         spin_unlock_irqrestore(&tport->tp_lock, flags);
1375
1376         return status;
1377 }
1378
1379
1380 static int ti_get_lsr(struct ti_port *tport)
1381 {
1382         int size, status;
1383         struct ti_device *tdev = tport->tp_tdev;
1384         struct usb_serial_port *port = tport->tp_port;
1385         int port_number = port->number - port->serial->minor;
1386         struct ti_port_status *data;
1387
1388         dbg("%s - port %d", __func__, port->number);
1389
1390         size = sizeof(struct ti_port_status);
1391         data = kmalloc(size, GFP_KERNEL);
1392         if (!data) {
1393                 dev_err(&port->dev, "%s - out of memory\n", __func__);
1394                 return -ENOMEM;
1395         }
1396
1397         status = ti_command_in_sync(tdev, TI_GET_PORT_STATUS,
1398                 (__u8)(TI_UART1_PORT+port_number), 0, (__u8 *)data, size);
1399         if (status) {
1400                 dev_err(&port->dev,
1401                         "%s - get port status command failed, %d\n",
1402                                                         __func__, status);
1403                 goto free_data;
1404         }
1405
1406         dbg("%s - lsr 0x%02X", __func__, data->bLSR);
1407
1408         tport->tp_lsr = data->bLSR;
1409
1410 free_data:
1411         kfree(data);
1412         return status;
1413 }
1414
1415
1416 static int ti_get_serial_info(struct ti_port *tport,
1417         struct serial_struct __user *ret_arg)
1418 {
1419         struct usb_serial_port *port = tport->tp_port;
1420         struct serial_struct ret_serial;
1421
1422         if (!ret_arg)
1423                 return -EFAULT;
1424
1425         memset(&ret_serial, 0, sizeof(ret_serial));
1426
1427         ret_serial.type = PORT_16550A;
1428         ret_serial.line = port->serial->minor;
1429         ret_serial.port = port->number - port->serial->minor;
1430         ret_serial.flags = tport->tp_flags;
1431         ret_serial.xmit_fifo_size = TI_WRITE_BUF_SIZE;
1432         ret_serial.baud_base = tport->tp_tdev->td_is_3410 ? 921600 : 460800;
1433         ret_serial.closing_wait = tport->tp_closing_wait;
1434
1435         if (copy_to_user(ret_arg, &ret_serial, sizeof(*ret_arg)))
1436                 return -EFAULT;
1437
1438         return 0;
1439 }
1440
1441
1442 static int ti_set_serial_info(struct tty_struct *tty, struct ti_port *tport,
1443         struct serial_struct __user *new_arg)
1444 {
1445         struct serial_struct new_serial;
1446
1447         if (copy_from_user(&new_serial, new_arg, sizeof(new_serial)))
1448                 return -EFAULT;
1449
1450         tport->tp_flags = new_serial.flags & TI_SET_SERIAL_FLAGS;
1451         tty->low_latency = (tport->tp_flags & ASYNC_LOW_LATENCY) ? 1 : 0;
1452         tport->tp_closing_wait = new_serial.closing_wait;
1453
1454         return 0;
1455 }
1456
1457
1458 static void ti_handle_new_msr(struct ti_port *tport, __u8 msr)
1459 {
1460         struct async_icount *icount;
1461         struct tty_struct *tty;
1462         unsigned long flags;
1463
1464         dbg("%s - msr 0x%02X", __func__, msr);
1465
1466         if (msr & TI_MSR_DELTA_MASK) {
1467                 spin_lock_irqsave(&tport->tp_lock, flags);
1468                 icount = &tport->tp_icount;
1469                 if (msr & TI_MSR_DELTA_CTS)
1470                         icount->cts++;
1471                 if (msr & TI_MSR_DELTA_DSR)
1472                         icount->dsr++;
1473                 if (msr & TI_MSR_DELTA_CD)
1474                         icount->dcd++;
1475                 if (msr & TI_MSR_DELTA_RI)
1476                         icount->rng++;
1477                 wake_up_interruptible(&tport->tp_msr_wait);
1478                 spin_unlock_irqrestore(&tport->tp_lock, flags);
1479         }
1480
1481         tport->tp_msr = msr & TI_MSR_MASK;
1482
1483         /* handle CTS flow control */
1484         tty = tty_port_tty_get(&tport->tp_port->port);
1485         if (tty && C_CRTSCTS(tty)) {
1486                 if (msr & TI_MSR_CTS) {
1487                         tty->hw_stopped = 0;
1488                         tty_wakeup(tty);
1489                 } else {
1490                         tty->hw_stopped = 1;
1491                 }
1492         }
1493         tty_kref_put(tty);
1494 }
1495
1496
1497 static void ti_drain(struct ti_port *tport, unsigned long timeout, int flush)
1498 {
1499         struct ti_device *tdev = tport->tp_tdev;
1500         struct usb_serial_port *port = tport->tp_port;
1501         wait_queue_t wait;
1502
1503         dbg("%s - port %d", __func__, port->number);
1504
1505         spin_lock_irq(&tport->tp_lock);
1506
1507         /* wait for data to drain from the buffer */
1508         tdev->td_urb_error = 0;
1509         init_waitqueue_entry(&wait, current);
1510         add_wait_queue(&tport->tp_write_wait, &wait);
1511         for (;;) {
1512                 set_current_state(TASK_INTERRUPTIBLE);
1513                 if (ti_buf_data_avail(tport->tp_write_buf) == 0
1514                 || timeout == 0 || signal_pending(current)
1515                 || tdev->td_urb_error
1516                 || port->serial->disconnected)  /* disconnect */
1517                         break;
1518                 spin_unlock_irq(&tport->tp_lock);
1519                 timeout = schedule_timeout(timeout);
1520                 spin_lock_irq(&tport->tp_lock);
1521         }
1522         set_current_state(TASK_RUNNING);
1523         remove_wait_queue(&tport->tp_write_wait, &wait);
1524
1525         /* flush any remaining data in the buffer */
1526         if (flush)
1527                 ti_buf_clear(tport->tp_write_buf);
1528
1529         spin_unlock_irq(&tport->tp_lock);
1530
1531         mutex_lock(&port->serial->disc_mutex);
1532         /* wait for data to drain from the device */
1533         /* wait for empty tx register, plus 20 ms */
1534         timeout += jiffies;
1535         tport->tp_lsr &= ~TI_LSR_TX_EMPTY;
1536         while ((long)(jiffies - timeout) < 0 && !signal_pending(current)
1537         && !(tport->tp_lsr&TI_LSR_TX_EMPTY) && !tdev->td_urb_error
1538         && !port->serial->disconnected) {
1539                 if (ti_get_lsr(tport))
1540                         break;
1541                 mutex_unlock(&port->serial->disc_mutex);
1542                 msleep_interruptible(20);
1543                 mutex_lock(&port->serial->disc_mutex);
1544         }
1545         mutex_unlock(&port->serial->disc_mutex);
1546 }
1547
1548
1549 static void ti_stop_read(struct ti_port *tport, struct tty_struct *tty)
1550 {
1551         unsigned long flags;
1552
1553         spin_lock_irqsave(&tport->tp_lock, flags);
1554
1555         if (tport->tp_read_urb_state == TI_READ_URB_RUNNING)
1556                 tport->tp_read_urb_state = TI_READ_URB_STOPPING;
1557
1558         spin_unlock_irqrestore(&tport->tp_lock, flags);
1559 }
1560
1561
1562 static int ti_restart_read(struct ti_port *tport, struct tty_struct *tty)
1563 {
1564         struct urb *urb;
1565         int status = 0;
1566         unsigned long flags;
1567
1568         spin_lock_irqsave(&tport->tp_lock, flags);
1569
1570         if (tport->tp_read_urb_state == TI_READ_URB_STOPPED) {
1571                 tport->tp_read_urb_state = TI_READ_URB_RUNNING;
1572                 urb = tport->tp_port->read_urb;
1573                 spin_unlock_irqrestore(&tport->tp_lock, flags);
1574                 urb->complete = ti_bulk_in_callback;
1575                 urb->context = tport;
1576                 urb->dev = tport->tp_port->serial->dev;
1577                 status = usb_submit_urb(urb, GFP_KERNEL);
1578         } else  {
1579                 tport->tp_read_urb_state = TI_READ_URB_RUNNING;
1580                 spin_unlock_irqrestore(&tport->tp_lock, flags);
1581         }
1582
1583         return status;
1584 }
1585
1586
1587 static int ti_command_out_sync(struct ti_device *tdev, __u8 command,
1588         __u16 moduleid, __u16 value, __u8 *data, int size)
1589 {
1590         int status;
1591
1592         status = usb_control_msg(tdev->td_serial->dev,
1593                 usb_sndctrlpipe(tdev->td_serial->dev, 0), command,
1594                 (USB_TYPE_VENDOR | USB_RECIP_DEVICE | USB_DIR_OUT),
1595                 value, moduleid, data, size, 1000);
1596
1597         if (status == size)
1598                 status = 0;
1599
1600         if (status > 0)
1601                 status = -ECOMM;
1602
1603         return status;
1604 }
1605
1606
1607 static int ti_command_in_sync(struct ti_device *tdev, __u8 command,
1608         __u16 moduleid, __u16 value, __u8 *data, int size)
1609 {
1610         int status;
1611
1612         status = usb_control_msg(tdev->td_serial->dev,
1613                 usb_rcvctrlpipe(tdev->td_serial->dev, 0), command,
1614                 (USB_TYPE_VENDOR | USB_RECIP_DEVICE | USB_DIR_IN),
1615                 value, moduleid, data, size, 1000);
1616
1617         if (status == size)
1618                 status = 0;
1619
1620         if (status > 0)
1621                 status = -ECOMM;
1622
1623         return status;
1624 }
1625
1626
1627 static int ti_write_byte(struct ti_device *tdev, unsigned long addr,
1628         __u8 mask, __u8 byte)
1629 {
1630         int status;
1631         unsigned int size;
1632         struct ti_write_data_bytes *data;
1633         struct device *dev = &tdev->td_serial->dev->dev;
1634
1635         dbg("%s - addr 0x%08lX, mask 0x%02X, byte 0x%02X",
1636                                         __func__, addr, mask, byte);
1637
1638         size = sizeof(struct ti_write_data_bytes) + 2;
1639         data = kmalloc(size, GFP_KERNEL);
1640         if (!data) {
1641                 dev_err(dev, "%s - out of memory\n", __func__);
1642                 return -ENOMEM;
1643         }
1644
1645         data->bAddrType = TI_RW_DATA_ADDR_XDATA;
1646         data->bDataType = TI_RW_DATA_BYTE;
1647         data->bDataCounter = 1;
1648         data->wBaseAddrHi = cpu_to_be16(addr>>16);
1649         data->wBaseAddrLo = cpu_to_be16(addr);
1650         data->bData[0] = mask;
1651         data->bData[1] = byte;
1652
1653         status = ti_command_out_sync(tdev, TI_WRITE_DATA, TI_RAM_PORT, 0,
1654                 (__u8 *)data, size);
1655
1656         if (status < 0)
1657                 dev_err(dev, "%s - failed, %d\n", __func__, status);
1658
1659         kfree(data);
1660
1661         return status;
1662 }
1663
1664 static int ti_do_download(struct usb_device *dev, int pipe,
1665                                                 u8 *buffer, int size)
1666 {
1667         int pos;
1668         u8 cs = 0;
1669         int done;
1670         struct ti_firmware_header *header;
1671         int status;
1672         int len;
1673
1674         for (pos = sizeof(struct ti_firmware_header); pos < size; pos++)
1675                 cs = (__u8)(cs + buffer[pos]);
1676
1677         header = (struct ti_firmware_header *)buffer;
1678         header->wLength = cpu_to_le16((__u16)(size
1679                                         - sizeof(struct ti_firmware_header)));
1680         header->bCheckSum = cs;
1681
1682         dbg("%s - downloading firmware", __func__);
1683         for (pos = 0; pos < size; pos += done) {
1684                 len = min(size - pos, TI_DOWNLOAD_MAX_PACKET_SIZE);
1685                 status = usb_bulk_msg(dev, pipe, buffer + pos, len,
1686                                                                 &done, 1000);
1687                 if (status)
1688                         break;
1689         }
1690         return status;
1691 }
1692
1693 static int ti_download_firmware(struct ti_device *tdev)
1694 {
1695         int status;
1696         int buffer_size;
1697         __u8 *buffer;
1698         struct usb_device *dev = tdev->td_serial->dev;
1699         unsigned int pipe = usb_sndbulkpipe(dev,
1700                 tdev->td_serial->port[0]->bulk_out_endpointAddress);
1701         const struct firmware *fw_p;
1702         char buf[32];
1703
1704         /* try ID specific firmware first, then try generic firmware */
1705         sprintf(buf, "ti_usb-v%04x-p%04x.fw", dev->descriptor.idVendor,
1706             dev->descriptor.idProduct);
1707         if ((status = request_firmware(&fw_p, buf, &dev->dev)) != 0) {
1708                 buf[0] = '\0';
1709                 if (dev->descriptor.idVendor == MTS_VENDOR_ID) {
1710                         switch (dev->descriptor.idProduct) {
1711                         case MTS_CDMA_PRODUCT_ID:
1712                                 strcpy(buf, "mts_cdma.fw");
1713                                 break;
1714                         case MTS_GSM_PRODUCT_ID:
1715                                 strcpy(buf, "mts_gsm.fw");
1716                                 break;
1717                         case MTS_EDGE_PRODUCT_ID:
1718                                 strcpy(buf, "mts_edge.fw");
1719                                 break;
1720                         }
1721                 }
1722                 if (buf[0] == '\0') {
1723                         if (tdev->td_is_3410)
1724                                 strcpy(buf, "ti_3410.fw");
1725                         else
1726                                 strcpy(buf, "ti_5052.fw");
1727                 }
1728                 status = request_firmware(&fw_p, buf, &dev->dev);
1729         }
1730         if (status) {
1731                 dev_err(&dev->dev, "%s - firmware not found\n", __func__);
1732                 return -ENOENT;
1733         }
1734         if (fw_p->size > TI_FIRMWARE_BUF_SIZE) {
1735                 dev_err(&dev->dev, "%s - firmware too large\n", __func__);
1736                 return -ENOENT;
1737         }
1738
1739         buffer_size = TI_FIRMWARE_BUF_SIZE + sizeof(struct ti_firmware_header);
1740         buffer = kmalloc(buffer_size, GFP_KERNEL);
1741         if (buffer) {
1742                 memcpy(buffer, fw_p->data, fw_p->size);
1743                 memset(buffer + fw_p->size, 0xff, buffer_size - fw_p->size);
1744                 status = ti_do_download(dev, pipe, buffer, fw_p->size);
1745                 kfree(buffer);
1746         } else {
1747                 status = -ENOMEM;
1748         }
1749         release_firmware(fw_p);
1750         if (status) {
1751                 dev_err(&dev->dev, "%s - error downloading firmware, %d\n",
1752                                                         __func__, status);
1753                 return status;
1754         }
1755
1756         dbg("%s - download successful", __func__);
1757
1758         return 0;
1759 }
1760
1761
1762 /* Circular Buffer Functions */
1763
1764 /*
1765  * ti_buf_alloc
1766  *
1767  * Allocate a circular buffer and all associated memory.
1768  */
1769
1770 static struct circ_buf *ti_buf_alloc(void)
1771 {
1772         struct circ_buf *cb;
1773
1774         cb = kmalloc(sizeof(struct circ_buf), GFP_KERNEL);
1775         if (cb == NULL)
1776                 return NULL;
1777
1778         cb->buf = kmalloc(TI_WRITE_BUF_SIZE, GFP_KERNEL);
1779         if (cb->buf == NULL) {
1780                 kfree(cb);
1781                 return NULL;
1782         }
1783
1784         ti_buf_clear(cb);
1785
1786         return cb;
1787 }
1788
1789
1790 /*
1791  * ti_buf_free
1792  *
1793  * Free the buffer and all associated memory.
1794  */
1795
1796 static void ti_buf_free(struct circ_buf *cb)
1797 {
1798         kfree(cb->buf);
1799         kfree(cb);
1800 }
1801
1802
1803 /*
1804  * ti_buf_clear
1805  *
1806  * Clear out all data in the circular buffer.
1807  */
1808
1809 static void ti_buf_clear(struct circ_buf *cb)
1810 {
1811         cb->head = cb->tail = 0;
1812 }
1813
1814
1815 /*
1816  * ti_buf_data_avail
1817  *
1818  * Return the number of bytes of data available in the circular
1819  * buffer.
1820  */
1821
1822 static int ti_buf_data_avail(struct circ_buf *cb)
1823 {
1824         return CIRC_CNT(cb->head, cb->tail, TI_WRITE_BUF_SIZE);
1825 }
1826
1827
1828 /*
1829  * ti_buf_space_avail
1830  *
1831  * Return the number of bytes of space available in the circular
1832  * buffer.
1833  */
1834
1835 static int ti_buf_space_avail(struct circ_buf *cb)
1836 {
1837         return CIRC_SPACE(cb->head, cb->tail, TI_WRITE_BUF_SIZE);
1838 }
1839
1840
1841 /*
1842  * ti_buf_put
1843  *
1844  * Copy data data from a user buffer and put it into the circular buffer.
1845  * Restrict to the amount of space available.
1846  *
1847  * Return the number of bytes copied.
1848  */
1849
1850 static int ti_buf_put(struct circ_buf *cb, const char *buf, int count)
1851 {
1852         int c, ret = 0;
1853
1854         while (1) {
1855                 c = CIRC_SPACE_TO_END(cb->head, cb->tail, TI_WRITE_BUF_SIZE);
1856                 if (count < c)
1857                         c = count;
1858                 if (c <= 0)
1859                         break;
1860                 memcpy(cb->buf + cb->head, buf, c);
1861                 cb->head = (cb->head + c) & (TI_WRITE_BUF_SIZE-1);
1862                 buf += c;
1863                 count -= c;
1864                 ret += c;
1865         }
1866
1867         return ret;
1868 }
1869
1870
1871 /*
1872  * ti_buf_get
1873  *
1874  * Get data from the circular buffer and copy to the given buffer.
1875  * Restrict to the amount of data available.
1876  *
1877  * Return the number of bytes copied.
1878  */
1879
1880 static int ti_buf_get(struct circ_buf *cb, char *buf, int count)
1881 {
1882         int c, ret = 0;
1883
1884         while (1) {
1885                 c = CIRC_CNT_TO_END(cb->head, cb->tail, TI_WRITE_BUF_SIZE);
1886                 if (count < c)
1887                         c = count;
1888                 if (c <= 0)
1889                         break;
1890                 memcpy(buf, cb->buf + cb->tail, c);
1891                 cb->tail = (cb->tail + c) & (TI_WRITE_BUF_SIZE-1);
1892                 buf += c;
1893                 count -= c;
1894                 ret += c;
1895         }
1896
1897         return ret;
1898 }