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  * This driver needs this hotplug script in /etc/hotplug/usb/ti_usb_3410_5052
  21  * or in /etc/hotplug.d/usb/ti_usb_3410_5052.hotplug to set the device
  22  * configuration.
  23  *
  24  * #!/bin/bash
  25  *
  26  * BOOT_CONFIG=1
  27  * ACTIVE_CONFIG=2
  28  *
  29  * if [[ "$ACTION" != "add" ]]
  30  * then
  31  *      exit
  32  * fi
  33  *
  34  * CONFIG_PATH=/sys${DEVPATH%/?*}/bConfigurationValue
  35  *
  36  * if [[ 0`cat $CONFIG_PATH` -ne $BOOT_CONFIG ]]
  37  * then
  38  *      exit
  39  * fi
  40  *
  41  * PRODUCT=${PRODUCT%/?*}               # delete version
  42  * VENDOR_ID=`printf "%d" 0x${PRODUCT%/?*}`
  43  * PRODUCT_ID=`printf "%d" 0x${PRODUCT#*?/}`
  44  *
  45  * PARAM_PATH=/sys/module/ti_usb_3410_5052/parameters
  46  *
  47  * function scan() {
  48  *      s=$1
  49  *      shift
  50  *      for i
  51  *      do
  52  *              if [[ $s -eq $i ]]
  53  *              then
  54  *                      return 0
  55  *              fi
  56  *      done
  57  *      return 1
  58  * }
  59  *
  60  * IFS=$IFS,
  61  *
  62  * if (scan $VENDOR_ID 1105 `cat $PARAM_PATH/vendor_3410` &&
  63  * scan $PRODUCT_ID 13328 `cat $PARAM_PATH/product_3410`) ||
  64  * (scan $VENDOR_ID 1105 `cat $PARAM_PATH/vendor_5052` &&
  65  * scan $PRODUCT_ID 20562 20818 20570 20575 `cat $PARAM_PATH/product_5052`)
  66  * then
  67  *      echo $ACTIVE_CONFIG > $CONFIG_PATH
  68  * fi
  69  */
  70
  71 #include <linux/kernel.h>
  72 #include <linux/errno.h>
  73 #include <linux/init.h>
  74 #include <linux/slab.h>
  75 #include <linux/tty.h>
  76 #include <linux/tty_driver.h>
  77 #include <linux/tty_flip.h>
  78 #include <linux/module.h>
  79 #include <linux/spinlock.h>
  80 #include <linux/ioctl.h>
  81 #include <linux/serial.h>
  82 #include <linux/circ_buf.h>
  83 #include <linux/mutex.h>
  84 #include <asm/uaccess.h>
  85 #include <asm/semaphore.h>
  86 #include <linux/usb.h>
  87 #include <linux/usb/serial.h>
  88
  89 #include "ti_usb_3410_5052.h"
  90 #include "ti_fw_3410.h"         /* firmware image for 3410 */
  91 #include "ti_fw_5052.h"         /* firmware image for 5052 */
  92
  93
  94 /* Defines */
  95
  96 #define TI_DRIVER_VERSION       "v0.9"
  97 #define TI_DRIVER_AUTHOR        "Al Borchers <alborchers@steinerpoint.com>"
  98 #define TI_DRIVER_DESC          "TI USB 3410/5052 Serial Driver"
  99
 100 #define TI_FIRMWARE_BUF_SIZE    16284
 101
 102 #define TI_WRITE_BUF_SIZE       1024
 103
 104 #define TI_TRANSFER_TIMEOUT     2
 105
 106 #define TI_DEFAULT_LOW_LATENCY  0
 107 #define TI_DEFAULT_CLOSING_WAIT 4000            /* in .01 secs */
 108
 109 /* supported setserial flags */
 110 #define TI_SET_SERIAL_FLAGS     (ASYNC_LOW_LATENCY)
 111
 112 /* read urb states */
 113 #define TI_READ_URB_RUNNING     0
 114 #define TI_READ_URB_STOPPING    1
 115 #define TI_READ_URB_STOPPED     2
 116
 117 #define TI_EXTRA_VID_PID_COUNT  5
 118
 119
 120 /* Structures */
 121
 122 struct ti_port {
 123         int                     tp_is_open;
 124         __u8                    tp_msr;
 125         __u8                    tp_lsr;
 126         __u8                    tp_shadow_mcr;
 127         __u8                    tp_uart_mode;   /* 232 or 485 modes */
 128         unsigned int            tp_uart_base_addr;
 129         int                     tp_flags;
 130         int                     tp_closing_wait;/* in .01 secs */
 131         struct async_icount     tp_icount;
 132         wait_queue_head_t       tp_msr_wait;    /* wait for msr change */
 133         wait_queue_head_t       tp_write_wait;
 134         struct ti_device        *tp_tdev;
 135         struct usb_serial_port  *tp_port;
 136         spinlock_t              tp_lock;
 137         int                     tp_read_urb_state;
 138         int                     tp_write_urb_in_use;
 139         struct circ_buf         *tp_write_buf;
 140 };
 141
 142 struct ti_device {
 143         struct mutex            td_open_close_lock;
 144         int                     td_open_port_count;
 145         struct usb_serial       *td_serial;
 146         int                     td_is_3410;
 147         int                     td_urb_error;
 148 };
 149
 150
 151 /* Function Declarations */
 152
 153 static int ti_startup(struct usb_serial *serial);
 154 static void ti_shutdown(struct usb_serial *serial);
 155 static int ti_open(struct usb_serial_port *port, struct file *file);
 156 static void ti_close(struct usb_serial_port *port, struct file *file);
 157 static int ti_write(struct usb_serial_port *port, const unsigned char *data,
 158         int count);
 159 static int ti_write_room(struct usb_serial_port *port);
 160 static int ti_chars_in_buffer(struct usb_serial_port *port);
 161 static void ti_throttle(struct usb_serial_port *port);
 162 static void ti_unthrottle(struct usb_serial_port *port);
 163 static int ti_ioctl(struct usb_serial_port *port, struct file *file, unsigned int cmd, unsigned long arg);
 164 static void ti_set_termios(struct usb_serial_port *port,
 165         struct ktermios *old_termios);
 166 static int ti_tiocmget(struct usb_serial_port *port, struct file *file);
 167 static int ti_tiocmset(struct usb_serial_port *port, struct file *file,
 168         unsigned int set, unsigned int clear);
 169 static void ti_break(struct usb_serial_port *port, int break_state);
 170 static void ti_interrupt_callback(struct urb *urb);
 171 static void ti_bulk_in_callback(struct urb *urb);
 172 static void ti_bulk_out_callback(struct urb *urb);
 173
 174 static void ti_recv(struct device *dev, struct tty_struct *tty,
 175         unsigned char *data, int length);
 176 static void ti_send(struct ti_port *tport);
 177 static int ti_set_mcr(struct ti_port *tport, unsigned int mcr);
 178 static int ti_get_lsr(struct ti_port *tport);
 179 static int ti_get_serial_info(struct ti_port *tport,
 180         struct serial_struct __user *ret_arg);
 181 static int ti_set_serial_info(struct ti_port *tport,
 182         struct serial_struct __user *new_arg);
 183 static void ti_handle_new_msr(struct ti_port *tport, __u8 msr);
 184
 185 static void ti_drain(struct ti_port *tport, unsigned long timeout, int flush);
 186
 187 static void ti_stop_read(struct ti_port *tport, struct tty_struct *tty);
 188 static int ti_restart_read(struct ti_port *tport, struct tty_struct *tty);
 189
 190 static int ti_command_out_sync(struct ti_device *tdev, __u8 command,
 191         __u16 moduleid, __u16 value, __u8 *data, int size);
 192 static int ti_command_in_sync(struct ti_device *tdev, __u8 command,
 193         __u16 moduleid, __u16 value, __u8 *data, int size);
 194
 195 static int ti_write_byte(struct ti_device *tdev, unsigned long addr,
 196         __u8 mask, __u8 byte);
 197
 198 static int ti_download_firmware(struct ti_device *tdev,
 199         unsigned char *firmware, unsigned int firmware_size);
 200
 201 /* circular buffer */
 202 static struct circ_buf *ti_buf_alloc(void);
 203 static void ti_buf_free(struct circ_buf *cb);
 204 static void ti_buf_clear(struct circ_buf *cb);
 205 static int ti_buf_data_avail(struct circ_buf *cb);
 206 static int ti_buf_space_avail(struct circ_buf *cb);
 207 static int ti_buf_put(struct circ_buf *cb, const char *buf, int count);
 208 static int ti_buf_get(struct circ_buf *cb, char *buf, int count);
 209
 210
 211 /* Data */
 212
 213 /* module parameters */
 214 static int debug;
 215 static int low_latency = TI_DEFAULT_LOW_LATENCY;
 216 static int closing_wait = TI_DEFAULT_CLOSING_WAIT;
 217 static ushort vendor_3410[TI_EXTRA_VID_PID_COUNT];
 218 static unsigned int vendor_3410_count;
 219 static ushort product_3410[TI_EXTRA_VID_PID_COUNT];
 220 static unsigned int product_3410_count;
 221 static ushort vendor_5052[TI_EXTRA_VID_PID_COUNT];
 222 static unsigned int vendor_5052_count;
 223 static ushort product_5052[TI_EXTRA_VID_PID_COUNT];
 224 static unsigned int product_5052_count;
 225
 226 /* supported devices */
 227 /* the array dimension is the number of default entries plus */
 228 /* TI_EXTRA_VID_PID_COUNT user defined entries plus 1 terminating */
 229 /* null entry */
 230 static struct usb_device_id ti_id_table_3410[1+TI_EXTRA_VID_PID_COUNT+1] = {
 231         { USB_DEVICE(TI_VENDOR_ID, TI_3410_PRODUCT_ID) },
 232         { USB_DEVICE(TI_VENDOR_ID, TI_3410_EZ430_ID) },
 233 };
 234
 235 static struct usb_device_id ti_id_table_5052[4+TI_EXTRA_VID_PID_COUNT+1] = {
 236         { USB_DEVICE(TI_VENDOR_ID, TI_5052_BOOT_PRODUCT_ID) },
 237         { USB_DEVICE(TI_VENDOR_ID, TI_5152_BOOT_PRODUCT_ID) },
 238         { USB_DEVICE(TI_VENDOR_ID, TI_5052_EEPROM_PRODUCT_ID) },
 239         { USB_DEVICE(TI_VENDOR_ID, TI_5052_FIRMWARE_PRODUCT_ID) },
 240 };
 241
 242 static struct usb_device_id ti_id_table_combined[] = {
 243         { USB_DEVICE(TI_VENDOR_ID, TI_3410_PRODUCT_ID) },
 244         { USB_DEVICE(TI_VENDOR_ID, TI_3410_EZ430_ID) },
 245         { USB_DEVICE(TI_VENDOR_ID, TI_5052_BOOT_PRODUCT_ID) },
 246         { USB_DEVICE(TI_VENDOR_ID, TI_5152_BOOT_PRODUCT_ID) },
 247         { USB_DEVICE(TI_VENDOR_ID, TI_5052_EEPROM_PRODUCT_ID) },
 248         { USB_DEVICE(TI_VENDOR_ID, TI_5052_FIRMWARE_PRODUCT_ID) },
 249         { }
 250 };
 251
 252 static struct usb_driver ti_usb_driver = {
 253         .name                   = "ti_usb_3410_5052",
 254         .probe                  = usb_serial_probe,
 255         .disconnect             = usb_serial_disconnect,
 256         .id_table               = ti_id_table_combined,
 257         .no_dynamic_id =        1,
 258 };
 259
 260 static struct usb_serial_driver ti_1port_device = {
 261         .driver = {
 262                 .owner          = THIS_MODULE,
 263                 .name           = "ti_usb_3410_5052_1",
 264         },
 265         .description            = "TI USB 3410 1 port adapter",
 266         .usb_driver             = &ti_usb_driver,
 267         .id_table               = ti_id_table_3410,
 268         .num_interrupt_in       = 1,
 269         .num_bulk_in            = 1,
 270         .num_bulk_out           = 1,
 271         .num_ports              = 1,
 272         .attach                 = ti_startup,
 273         .shutdown               = ti_shutdown,
 274         .open                   = ti_open,
 275         .close                  = ti_close,
 276         .write                  = ti_write,
 277         .write_room             = ti_write_room,
 278         .chars_in_buffer        = ti_chars_in_buffer,
 279         .throttle               = ti_throttle,
 280         .unthrottle             = ti_unthrottle,
 281         .ioctl                  = ti_ioctl,
 282         .set_termios            = ti_set_termios,
 283         .tiocmget               = ti_tiocmget,
 284         .tiocmset               = ti_tiocmset,
 285         .break_ctl              = ti_break,
 286         .read_int_callback      = ti_interrupt_callback,
 287         .read_bulk_callback     = ti_bulk_in_callback,
 288         .write_bulk_callback    = ti_bulk_out_callback,
 289 };
 290
 291 static struct usb_serial_driver ti_2port_device = {
 292         .driver = {
 293                 .owner          = THIS_MODULE,
 294                 .name           = "ti_usb_3410_5052_2",
 295         },
 296         .description            = "TI USB 5052 2 port adapter",
 297         .usb_driver             = &ti_usb_driver,
 298         .id_table               = ti_id_table_5052,
 299         .num_interrupt_in       = 1,
 300         .num_bulk_in            = 2,
 301         .num_bulk_out           = 2,
 302         .num_ports              = 2,
 303         .attach                 = ti_startup,
 304         .shutdown               = ti_shutdown,
 305         .open                   = ti_open,
 306         .close                  = ti_close,
 307         .write                  = ti_write,
 308         .write_room             = ti_write_room,
 309         .chars_in_buffer        = ti_chars_in_buffer,
 310         .throttle               = ti_throttle,
 311         .unthrottle             = ti_unthrottle,
 312         .ioctl                  = ti_ioctl,
 313         .set_termios            = ti_set_termios,
 314         .tiocmget               = ti_tiocmget,
 315         .tiocmset               = ti_tiocmset,
 316         .break_ctl              = ti_break,
 317         .read_int_callback      = ti_interrupt_callback,
 318         .read_bulk_callback     = ti_bulk_in_callback,
 319         .write_bulk_callback    = ti_bulk_out_callback,
 320 };
 321
 322
 323 /* Module */
 324
 325 MODULE_AUTHOR(TI_DRIVER_AUTHOR);
 326 MODULE_DESCRIPTION(TI_DRIVER_DESC);
 327 MODULE_VERSION(TI_DRIVER_VERSION);
 328 MODULE_LICENSE("GPL");
 329
 330 module_param(debug, bool, S_IRUGO | S_IWUSR);
 331 MODULE_PARM_DESC(debug, "Enable debugging, 0=no, 1=yes");
 332
 333 module_param(low_latency, bool, S_IRUGO | S_IWUSR);
 334 MODULE_PARM_DESC(low_latency, "TTY low_latency flag, 0=off, 1=on, default is off");
 335
 336 module_param(closing_wait, int, S_IRUGO | S_IWUSR);
 337 MODULE_PARM_DESC(closing_wait, "Maximum wait for data to drain in close, in .01 secs, default is 4000");
 338
 339 module_param_array(vendor_3410, ushort, &vendor_3410_count, S_IRUGO);
 340 MODULE_PARM_DESC(vendor_3410, "Vendor ids for 3410 based devices, 1-5 short integers");
 341 module_param_array(product_3410, ushort, &product_3410_count, S_IRUGO);
 342 MODULE_PARM_DESC(product_3410, "Product ids for 3410 based devices, 1-5 short integers");
 343 module_param_array(vendor_5052, ushort, &vendor_5052_count, S_IRUGO);
 344 MODULE_PARM_DESC(vendor_5052, "Vendor ids for 5052 based devices, 1-5 short integers");
 345 module_param_array(product_5052, ushort, &product_5052_count, S_IRUGO);
 346 MODULE_PARM_DESC(product_5052, "Product ids for 5052 based devices, 1-5 short integers");
 347
 348 MODULE_DEVICE_TABLE(usb, ti_id_table_combined);
 349
 350
 351 /* Functions */
 352
 353 static int __init ti_init(void)
 354 {
 355         int i,j;
 356         int ret;
 357
 358         /* insert extra vendor and product ids */
 359         j = ARRAY_SIZE(ti_id_table_3410) - TI_EXTRA_VID_PID_COUNT - 1;
 360         for (i=0; i<min(vendor_3410_count,product_3410_count); i++,j++) {
 361                 ti_id_table_3410[j].idVendor = vendor_3410[i];
 362                 ti_id_table_3410[j].idProduct = product_3410[i];
 363                 ti_id_table_3410[j].match_flags = USB_DEVICE_ID_MATCH_DEVICE;
 364         }
 365         j = ARRAY_SIZE(ti_id_table_5052) - TI_EXTRA_VID_PID_COUNT - 1;
 366         for (i=0; i<min(vendor_5052_count,product_5052_count); i++,j++) {
 367                 ti_id_table_5052[j].idVendor = vendor_5052[i];
 368                 ti_id_table_5052[j].idProduct = product_5052[i];
 369                 ti_id_table_5052[j].match_flags = USB_DEVICE_ID_MATCH_DEVICE;
 370         }
 371
 372         ret = usb_serial_register(&ti_1port_device);
 373         if (ret)
 374                 goto failed_1port;
 375         ret = usb_serial_register(&ti_2port_device);
 376         if (ret)
 377                 goto failed_2port;
 378
 379         ret = usb_register(&ti_usb_driver);
 380         if (ret)
 381                 goto failed_usb;
 382
 383         info(TI_DRIVER_DESC " " TI_DRIVER_VERSION);
 384
 385         return 0;
 386
 387 failed_usb:
 388         usb_serial_deregister(&ti_2port_device);
 389 failed_2port:
 390         usb_serial_deregister(&ti_1port_device);
 391 failed_1port:
 392         return ret;
 393 }
 394
 395
 396 static void __exit ti_exit(void)
 397 {
 398         usb_serial_deregister(&ti_1port_device);
 399         usb_serial_deregister(&ti_2port_device);
 400         usb_deregister(&ti_usb_driver);
 401 }
 402
 403
 404 module_init(ti_init);
 405 module_exit(ti_exit);
 406
 407
 408 static int ti_startup(struct usb_serial *serial)
 409 {
 410         struct ti_device *tdev;
 411         struct ti_port *tport;
 412         struct usb_device *dev = serial->dev;
 413         int status;
 414         int i;
 415
 416
 417         dbg("%s - product 0x%4X, num configurations %d, configuration value %d",
 418             __FUNCTION__, le16_to_cpu(dev->descriptor.idProduct),
 419             dev->descriptor.bNumConfigurations,
 420             dev->actconfig->desc.bConfigurationValue);
 421
 422         /* create device structure */
 423         tdev = kzalloc(sizeof(struct ti_device), GFP_KERNEL);
 424         if (tdev == NULL) {
 425                 dev_err(&dev->dev, "%s - out of memory\n", __FUNCTION__);
 426                 return -ENOMEM;
 427         }
 428         mutex_init(&tdev->td_open_close_lock);
 429         tdev->td_serial = serial;
 430         usb_set_serial_data(serial, tdev);
 431
 432         /* determine device type */
 433         if (usb_match_id(serial->interface, ti_id_table_3410))
 434                 tdev->td_is_3410 = 1;
 435         dbg("%s - device type is %s", __FUNCTION__, tdev->td_is_3410 ? "3410" : "5052");
 436
 437         /* if we have only 1 configuration, download firmware */
 438         if (dev->descriptor.bNumConfigurations == 1) {
 439
 440                 if (tdev->td_is_3410)
 441                         status = ti_download_firmware(tdev, ti_fw_3410,
 442                                 sizeof(ti_fw_3410));
 443                 else
 444                         status = ti_download_firmware(tdev, ti_fw_5052,
 445                                 sizeof(ti_fw_5052));
 446                 if (status)
 447                         goto free_tdev;
 448
 449                 /* 3410 must be reset, 5052 resets itself */
 450                 if (tdev->td_is_3410) {
 451                         msleep_interruptible(100);
 452                         usb_reset_device(dev);
 453                 }
 454
 455                 status = -ENODEV;
 456                 goto free_tdev;
 457         }
 458
 459         /* the second configuration must be set (in sysfs by hotplug script) */
 460         if (dev->actconfig->desc.bConfigurationValue == TI_BOOT_CONFIG) {
 461                 status = -ENODEV;
 462                 goto free_tdev;
 463         }
 464
 465         /* set up port structures */
 466         for (i = 0; i < serial->num_ports; ++i) {
 467                 tport = kzalloc(sizeof(struct ti_port), GFP_KERNEL);
 468                 if (tport == NULL) {
 469                         dev_err(&dev->dev, "%s - out of memory\n", __FUNCTION__);
 470                         status = -ENOMEM;
 471                         goto free_tports;
 472                 }
 473                 spin_lock_init(&tport->tp_lock);
 474                 tport->tp_uart_base_addr = (i == 0 ? TI_UART1_BASE_ADDR : TI_UART2_BASE_ADDR);
 475                 tport->tp_flags = low_latency ? ASYNC_LOW_LATENCY : 0;
 476                 tport->tp_closing_wait = closing_wait;
 477                 init_waitqueue_head(&tport->tp_msr_wait);
 478                 init_waitqueue_head(&tport->tp_write_wait);
 479                 tport->tp_write_buf = ti_buf_alloc();
 480                 if (tport->tp_write_buf == NULL) {
 481                         dev_err(&dev->dev, "%s - out of memory\n", __FUNCTION__);
 482                         kfree(tport);
 483                         status = -ENOMEM;
 484                         goto free_tports;
 485                 }
 486                 tport->tp_port = serial->port[i];
 487                 tport->tp_tdev = tdev;
 488                 usb_set_serial_port_data(serial->port[i], tport);
 489                 tport->tp_uart_mode = 0;        /* default is RS232 */
 490         }
 491
 492         return 0;
 493
 494 free_tports:
 495         for (--i; i>=0; --i) {
 496                 tport = usb_get_serial_port_data(serial->port[i]);
 497                 ti_buf_free(tport->tp_write_buf);
 498                 kfree(tport);
 499                 usb_set_serial_port_data(serial->port[i], NULL);
 500         }
 501 free_tdev:
 502         kfree(tdev);
 503         usb_set_serial_data(serial, NULL);
 504         return status;
 505 }
 506
 507
 508 static void ti_shutdown(struct usb_serial *serial)
 509 {
 510         int i;
 511         struct ti_device *tdev = usb_get_serial_data(serial);
 512         struct ti_port *tport;
 513
 514         dbg("%s", __FUNCTION__);
 515
 516         for (i=0; i < serial->num_ports; ++i) {
 517                 tport = usb_get_serial_port_data(serial->port[i]);
 518                 if (tport) {
 519                         ti_buf_free(tport->tp_write_buf);
 520                         kfree(tport);
 521                         usb_set_serial_port_data(serial->port[i], NULL);
 522                 }
 523         }
 524
 525         kfree(tdev);
 526         usb_set_serial_data(serial, NULL);
 527 }
 528
 529
 530 static int ti_open(struct usb_serial_port *port, struct file *file)
 531 {
 532         struct ti_port *tport = usb_get_serial_port_data(port);
 533         struct ti_device *tdev;
 534         struct usb_device *dev;
 535         struct urb *urb;
 536         int port_number;
 537         int status;
 538         __u16 open_settings = (__u8)(TI_PIPE_MODE_CONTINOUS |
 539                              TI_PIPE_TIMEOUT_ENABLE |
 540                              (TI_TRANSFER_TIMEOUT << 2));
 541
 542         dbg("%s - port %d", __FUNCTION__, port->number);
 543
 544         if (tport == NULL)
 545                 return -ENODEV;
 546
 547         dev = port->serial->dev;
 548         tdev = tport->tp_tdev;
 549
 550         /* only one open on any port on a device at a time */
 551         if (mutex_lock_interruptible(&tdev->td_open_close_lock))
 552                 return -ERESTARTSYS;
 553
 554         if (port->tty)
 555                 port->tty->low_latency =
 556                         (tport->tp_flags & ASYNC_LOW_LATENCY) ? 1 : 0;
 557
 558         port_number = port->number - port->serial->minor;
 559
 560         memset(&(tport->tp_icount), 0x00, sizeof(tport->tp_icount));
 561
 562         tport->tp_msr = 0;
 563         tport->tp_shadow_mcr |= (TI_MCR_RTS | TI_MCR_DTR);
 564
 565         /* start interrupt urb the first time a port is opened on this device */
 566         if (tdev->td_open_port_count == 0) {
 567                 dbg("%s - start interrupt in urb", __FUNCTION__);
 568                 urb = tdev->td_serial->port[0]->interrupt_in_urb;
 569                 if (!urb) {
 570                         dev_err(&port->dev, "%s - no interrupt urb\n", __FUNCTION__);
 571                         status = -EINVAL;
 572                         goto release_lock;
 573                 }
 574                 urb->complete = ti_interrupt_callback;
 575                 urb->context = tdev;
 576                 urb->dev = dev;
 577                 status = usb_submit_urb(urb, GFP_KERNEL);
 578                 if (status) {
 579                         dev_err(&port->dev, "%s - submit interrupt urb failed, %d\n", __FUNCTION__, status);
 580                         goto release_lock;
 581                 }
 582         }
 583
 584         ti_set_termios(port, port->tty->termios);
 585
 586         dbg("%s - sending TI_OPEN_PORT", __FUNCTION__);
 587         status = ti_command_out_sync(tdev, TI_OPEN_PORT,
 588                 (__u8)(TI_UART1_PORT + port_number), open_settings, NULL, 0);
 589         if (status) {
 590                 dev_err(&port->dev, "%s - cannot send open command, %d\n", __FUNCTION__, status);
 591                 goto unlink_int_urb;
 592         }
 593
 594         dbg("%s - sending TI_START_PORT", __FUNCTION__);
 595         status = ti_command_out_sync(tdev, TI_START_PORT,
 596                 (__u8)(TI_UART1_PORT + port_number), 0, NULL, 0);
 597         if (status) {
 598                 dev_err(&port->dev, "%s - cannot send start command, %d\n", __FUNCTION__, status);
 599                 goto unlink_int_urb;
 600         }
 601
 602         dbg("%s - sending TI_PURGE_PORT", __FUNCTION__);
 603         status = ti_command_out_sync(tdev, TI_PURGE_PORT,
 604                 (__u8)(TI_UART1_PORT + port_number), TI_PURGE_INPUT, NULL, 0);
 605         if (status) {
 606                 dev_err(&port->dev, "%s - cannot clear input buffers, %d\n", __FUNCTION__, status);
 607                 goto unlink_int_urb;
 608         }
 609         status = ti_command_out_sync(tdev, TI_PURGE_PORT,
 610                 (__u8)(TI_UART1_PORT + port_number), TI_PURGE_OUTPUT, NULL, 0);
 611         if (status) {
 612                 dev_err(&port->dev, "%s - cannot clear output buffers, %d\n", __FUNCTION__, status);
 613                 goto unlink_int_urb;
 614         }
 615
 616         /* reset the data toggle on the bulk endpoints to work around bug in
 617          * host controllers where things get out of sync some times */
 618         usb_clear_halt(dev, port->write_urb->pipe);
 619         usb_clear_halt(dev, port->read_urb->pipe);
 620
 621         ti_set_termios(port, port->tty->termios);
 622
 623         dbg("%s - sending TI_OPEN_PORT (2)", __FUNCTION__);
 624         status = ti_command_out_sync(tdev, TI_OPEN_PORT,
 625                 (__u8)(TI_UART1_PORT + port_number), open_settings, NULL, 0);
 626         if (status) {
 627                 dev_err(&port->dev, "%s - cannot send open command (2), %d\n", __FUNCTION__, status);
 628                 goto unlink_int_urb;
 629         }
 630
 631         dbg("%s - sending TI_START_PORT (2)", __FUNCTION__);
 632         status = ti_command_out_sync(tdev, TI_START_PORT,
 633                 (__u8)(TI_UART1_PORT + port_number), 0, NULL, 0);
 634         if (status) {
 635                 dev_err(&port->dev, "%s - cannot send start command (2), %d\n", __FUNCTION__, status);
 636                 goto unlink_int_urb;
 637         }
 638
 639         /* start read urb */
 640         dbg("%s - start read urb", __FUNCTION__);
 641         urb = port->read_urb;
 642         if (!urb) {
 643                 dev_err(&port->dev, "%s - no read urb\n", __FUNCTION__);
 644                 status = -EINVAL;
 645                 goto unlink_int_urb;
 646         }
 647         tport->tp_read_urb_state = TI_READ_URB_RUNNING;
 648         urb->complete = ti_bulk_in_callback;
 649         urb->context = tport;
 650         urb->dev = dev;
 651         status = usb_submit_urb(urb, GFP_KERNEL);
 652         if (status) {
 653                 dev_err(&port->dev, "%s - submit read urb failed, %d\n", __FUNCTION__, status);
 654                 goto unlink_int_urb;
 655         }
 656
 657         tport->tp_is_open = 1;
 658         ++tdev->td_open_port_count;
 659
 660         goto release_lock;
 661
 662 unlink_int_urb:
 663         if (tdev->td_open_port_count == 0)
 664                 usb_kill_urb(port->serial->port[0]->interrupt_in_urb);
 665 release_lock:
 666         mutex_unlock(&tdev->td_open_close_lock);
 667         dbg("%s - exit %d", __FUNCTION__, status);
 668         return status;
 669 }
 670
 671
 672 static void ti_close(struct usb_serial_port *port, struct file *file)
 673 {
 674         struct ti_device *tdev;
 675         struct ti_port *tport;
 676         int port_number;
 677         int status;
 678         int do_unlock;
 679
 680         dbg("%s - port %d", __FUNCTION__, port->number);
 681
 682         tdev = usb_get_serial_data(port->serial);
 683         tport = usb_get_serial_port_data(port);
 684         if (tdev == NULL || tport == NULL)
 685                 return;
 686
 687         tport->tp_is_open = 0;
 688
 689         ti_drain(tport, (tport->tp_closing_wait*HZ)/100, 1);
 690
 691         usb_kill_urb(port->read_urb);
 692         usb_kill_urb(port->write_urb);
 693         tport->tp_write_urb_in_use = 0;
 694
 695         port_number = port->number - port->serial->minor;
 696
 697         dbg("%s - sending TI_CLOSE_PORT", __FUNCTION__);
 698         status = ti_command_out_sync(tdev, TI_CLOSE_PORT,
 699                      (__u8)(TI_UART1_PORT + port_number), 0, NULL, 0);
 700         if (status)
 701                 dev_err(&port->dev, "%s - cannot send close port command, %d\n" , __FUNCTION__, status);
 702
 703         /* if mutex_lock is interrupted, continue anyway */
 704         do_unlock = !mutex_lock_interruptible(&tdev->td_open_close_lock);
 705         --tport->tp_tdev->td_open_port_count;
 706         if (tport->tp_tdev->td_open_port_count <= 0) {
 707                 /* last port is closed, shut down interrupt urb */
 708                 usb_kill_urb(port->serial->port[0]->interrupt_in_urb);
 709                 tport->tp_tdev->td_open_port_count = 0;
 710         }
 711         if (do_unlock)
 712                 mutex_unlock(&tdev->td_open_close_lock);
 713
 714         dbg("%s - exit", __FUNCTION__);
 715 }
 716
 717
 718 static int ti_write(struct usb_serial_port *port, const unsigned char *data,
 719         int count)
 720 {
 721         struct ti_port *tport = usb_get_serial_port_data(port);
 722         unsigned long flags;
 723
 724         dbg("%s - port %d", __FUNCTION__, port->number);
 725
 726         if (count == 0) {
 727                 dbg("%s - write request of 0 bytes", __FUNCTION__);
 728                 return 0;
 729         }
 730
 731         if (tport == NULL || !tport->tp_is_open)
 732                 return -ENODEV;
 733
 734         spin_lock_irqsave(&tport->tp_lock, flags);
 735         count = ti_buf_put(tport->tp_write_buf, data, count);
 736         spin_unlock_irqrestore(&tport->tp_lock, flags);
 737
 738         ti_send(tport);
 739
 740         return count;
 741 }
 742
 743
 744 static int ti_write_room(struct usb_serial_port *port)
 745 {
 746         struct ti_port *tport = usb_get_serial_port_data(port);
 747         int room = 0;
 748         unsigned long flags;
 749
 750         dbg("%s - port %d", __FUNCTION__, port->number);
 751
 752         if (tport == NULL)
 753                 return -ENODEV;
 754
 755         spin_lock_irqsave(&tport->tp_lock, flags);
 756         room = ti_buf_space_avail(tport->tp_write_buf);
 757         spin_unlock_irqrestore(&tport->tp_lock, flags);
 758
 759         dbg("%s - returns %d", __FUNCTION__, room);
 760         return room;
 761 }
 762
 763
 764 static int ti_chars_in_buffer(struct usb_serial_port *port)
 765 {
 766         struct ti_port *tport = usb_get_serial_port_data(port);
 767         int chars = 0;
 768         unsigned long flags;
 769
 770         dbg("%s - port %d", __FUNCTION__, port->number);
 771
 772         if (tport == NULL)
 773                 return -ENODEV;
 774
 775         spin_lock_irqsave(&tport->tp_lock, flags);
 776         chars = ti_buf_data_avail(tport->tp_write_buf);
 777         spin_unlock_irqrestore(&tport->tp_lock, flags);
 778
 779         dbg("%s - returns %d", __FUNCTION__, chars);
 780         return chars;
 781 }
 782
 783
 784 static void ti_throttle(struct usb_serial_port *port)
 785 {
 786         struct ti_port *tport = usb_get_serial_port_data(port);
 787         struct tty_struct *tty;
 788
 789         dbg("%s - port %d", __FUNCTION__, port->number);
 790
 791         if (tport == NULL)
 792                 return;
 793
 794         tty = port->tty;
 795         if (!tty) {
 796                 dbg("%s - no tty", __FUNCTION__);
 797                 return;
 798         }
 799
 800         if (I_IXOFF(tty) || C_CRTSCTS(tty))
 801                 ti_stop_read(tport, tty);
 802
 803 }
 804
 805
 806 static void ti_unthrottle(struct usb_serial_port *port)
 807 {
 808         struct ti_port *tport = usb_get_serial_port_data(port);
 809         struct tty_struct *tty;
 810         int status;
 811
 812         dbg("%s - port %d", __FUNCTION__, port->number);
 813
 814         if (tport == NULL)
 815                 return;
 816
 817         tty = port->tty;
 818         if (!tty) {
 819                 dbg("%s - no tty", __FUNCTION__);
 820                 return;
 821         }
 822
 823         if (I_IXOFF(tty) || C_CRTSCTS(tty)) {
 824                 status = ti_restart_read(tport, tty);
 825                 if (status)
 826                         dev_err(&port->dev, "%s - cannot restart read, %d\n", __FUNCTION__, status);
 827         }
 828 }
 829
 830
 831 static int ti_ioctl(struct usb_serial_port *port, struct file *file,
 832         unsigned int cmd, unsigned long arg)
 833 {
 834         struct ti_port *tport = usb_get_serial_port_data(port);
 835         struct async_icount cnow;
 836         struct async_icount cprev;
 837
 838         dbg("%s - port %d, cmd = 0x%04X", __FUNCTION__, port->number, cmd);
 839
 840         if (tport == NULL)
 841                 return -ENODEV;
 842
 843         switch (cmd) {
 844                 case TIOCGSERIAL:
 845                         dbg("%s - (%d) TIOCGSERIAL", __FUNCTION__, port->number);
 846                         return ti_get_serial_info(tport, (struct serial_struct __user *)arg);
 847                         break;
 848
 849                 case TIOCSSERIAL:
 850                         dbg("%s - (%d) TIOCSSERIAL", __FUNCTION__, port->number);
 851                         return ti_set_serial_info(tport, (struct serial_struct __user *)arg);
 852                         break;
 853
 854                 case TIOCMIWAIT:
 855                         dbg("%s - (%d) TIOCMIWAIT", __FUNCTION__, port->number);
 856                         cprev = tport->tp_icount;
 857                         while (1) {
 858                                 interruptible_sleep_on(&tport->tp_msr_wait);
 859                                 if (signal_pending(current))
 860                                         return -ERESTARTSYS;
 861                                 cnow = tport->tp_icount;
 862                                 if (cnow.rng == cprev.rng && cnow.dsr == cprev.dsr &&
 863                                     cnow.dcd == cprev.dcd && cnow.cts == cprev.cts)
 864                                         return -EIO; /* no change => error */
 865                                 if (((arg & TIOCM_RNG) && (cnow.rng != cprev.rng)) ||
 866                                     ((arg & TIOCM_DSR) && (cnow.dsr != cprev.dsr)) ||
 867                                     ((arg & TIOCM_CD)  && (cnow.dcd != cprev.dcd)) ||
 868                                     ((arg & TIOCM_CTS) && (cnow.cts != cprev.cts)) ) {
 869                                         return 0;
 870                                 }
 871                                 cprev = cnow;
 872                         }
 873                         break;
 874
 875                 case TIOCGICOUNT:
 876                         dbg("%s - (%d) TIOCGICOUNT RX=%d, TX=%d", __FUNCTION__, port->number, tport->tp_icount.rx, tport->tp_icount.tx);
 877                         if (copy_to_user((void __user *)arg, &tport->tp_icount, sizeof(tport->tp_icount)))
 878                                 return -EFAULT;
 879                         return 0;
 880         }
 881
 882         return -ENOIOCTLCMD;
 883 }
 884
 885
 886 static void ti_set_termios(struct usb_serial_port *port,
 887         struct ktermios *old_termios)
 888 {
 889         struct ti_port *tport = usb_get_serial_port_data(port);
 890         struct tty_struct *tty = port->tty;
 891         struct ti_uart_config *config;
 892         tcflag_t cflag,iflag;
 893         int baud;
 894         int status;
 895         int port_number = port->number - port->serial->minor;
 896         unsigned int mcr;
 897
 898         dbg("%s - port %d", __FUNCTION__, port->number);
 899
 900         cflag = tty->termios->c_cflag;
 901         iflag = tty->termios->c_iflag;
 902
 903         dbg("%s - cflag %08x, iflag %08x", __FUNCTION__, cflag, iflag);
 904         dbg("%s - old clfag %08x, old iflag %08x", __FUNCTION__, old_termios->c_cflag, old_termios->c_iflag);
 905
 906         if (tport == NULL)
 907                 return;
 908
 909         config = kmalloc(sizeof(*config), GFP_KERNEL);
 910         if (!config) {
 911                 dev_err(&port->dev, "%s - out of memory\n", __FUNCTION__);
 912                 return;
 913         }
 914
 915         config->wFlags = 0;
 916
 917         /* these flags must be set */
 918         config->wFlags |= TI_UART_ENABLE_MS_INTS;
 919         config->wFlags |= TI_UART_ENABLE_AUTO_START_DMA;
 920         config->bUartMode = (__u8)(tport->tp_uart_mode);
 921
 922         switch (cflag & CSIZE) {
 923                 case CS5:
 924                             config->bDataBits = TI_UART_5_DATA_BITS;
 925                             break;
 926                 case CS6:
 927                             config->bDataBits = TI_UART_6_DATA_BITS;
 928                             break;
 929                 case CS7:
 930                             config->bDataBits = TI_UART_7_DATA_BITS;
 931                             break;
 932                 default:
 933                 case CS8:
 934                             config->bDataBits = TI_UART_8_DATA_BITS;
 935                             break;
 936         }
 937
 938         /* CMSPAR isn't supported by this driver */
 939         tty->termios->c_cflag &= ~CMSPAR;
 940
 941         if (cflag & PARENB) {
 942                 if (cflag & PARODD) {
 943                         config->wFlags |= TI_UART_ENABLE_PARITY_CHECKING;
 944                         config->bParity = TI_UART_ODD_PARITY;
 945                 } else {
 946                         config->wFlags |= TI_UART_ENABLE_PARITY_CHECKING;
 947                         config->bParity = TI_UART_EVEN_PARITY;
 948                 }
 949         } else {
 950                 config->wFlags &= ~TI_UART_ENABLE_PARITY_CHECKING;
 951                 config->bParity = TI_UART_NO_PARITY;
 952         }
 953
 954         if (cflag & CSTOPB)
 955                 config->bStopBits = TI_UART_2_STOP_BITS;
 956         else
 957                 config->bStopBits = TI_UART_1_STOP_BITS;
 958
 959         if (cflag & CRTSCTS) {
 960                 /* RTS flow control must be off to drop RTS for baud rate B0 */
 961                 if ((cflag & CBAUD) != B0)
 962                         config->wFlags |= TI_UART_ENABLE_RTS_IN;
 963                 config->wFlags |= TI_UART_ENABLE_CTS_OUT;
 964         } else {
 965                 tty->hw_stopped = 0;
 966                 ti_restart_read(tport, tty);
 967         }
 968
 969         if (I_IXOFF(tty) || I_IXON(tty)) {
 970                 config->cXon  = START_CHAR(tty);
 971                 config->cXoff = STOP_CHAR(tty);
 972
 973                 if (I_IXOFF(tty))
 974                         config->wFlags |= TI_UART_ENABLE_X_IN;
 975                 else
 976                         ti_restart_read(tport, tty);
 977
 978                 if (I_IXON(tty))
 979                         config->wFlags |= TI_UART_ENABLE_X_OUT;
 980         }
 981
 982         baud = tty_get_baud_rate(tty);
 983         if (!baud)
 984                 baud = 9600;
 985         if (tport->tp_tdev->td_is_3410)
 986                 config->wBaudRate = (__u16)((923077 + baud/2) / baud);
 987         else
 988                 config->wBaudRate = (__u16)((461538 + baud/2) / baud);
 989
 990         /* FIXME: Should calculate resulting baud here and report it back */
 991         if ((cflag & CBAUD) != B0)
 992                 tty_encode_baud_rate(tty, baud, baud);
 993
 994         dbg("%s - BaudRate=%d, wBaudRate=%d, wFlags=0x%04X, bDataBits=%d, bParity=%d, bStopBits=%d, cXon=%d, cXoff=%d, bUartMode=%d",
 995         __FUNCTION__, baud, config->wBaudRate, config->wFlags, config->bDataBits, config->bParity, config->bStopBits, config->cXon, config->cXoff, config->bUartMode);
 996
 997         cpu_to_be16s(&config->wBaudRate);
 998         cpu_to_be16s(&config->wFlags);
 999
1000         status = ti_command_out_sync(tport->tp_tdev, TI_SET_CONFIG,
1001                 (__u8)(TI_UART1_PORT + port_number), 0, (__u8 *)config,
1002                 sizeof(*config));
1003         if (status)
1004                 dev_err(&port->dev, "%s - cannot set config on port %d, %d\n", __FUNCTION__, port_number, status);
1005
1006         /* SET_CONFIG asserts RTS and DTR, reset them correctly */
1007         mcr = tport->tp_shadow_mcr;
1008         /* if baud rate is B0, clear RTS and DTR */
1009         if ((cflag & CBAUD) == B0)
1010                 mcr &= ~(TI_MCR_DTR | TI_MCR_RTS);
1011         status = ti_set_mcr(tport, mcr);
1012         if (status)
1013                 dev_err(&port->dev, "%s - cannot set modem control on port %d, %d\n", __FUNCTION__, port_number, status);
1014
1015         kfree(config);
1016 }
1017
1018
1019 static int ti_tiocmget(struct usb_serial_port *port, struct file *file)
1020 {
1021         struct ti_port *tport = usb_get_serial_port_data(port);
1022         unsigned int result;
1023         unsigned int msr;
1024         unsigned int mcr;
1025
1026         dbg("%s - port %d", __FUNCTION__, port->number);
1027
1028         if (tport == NULL)
1029                 return -ENODEV;
1030
1031         msr = tport->tp_msr;
1032         mcr = tport->tp_shadow_mcr;
1033
1034         result = ((mcr & TI_MCR_DTR) ? TIOCM_DTR : 0)
1035                 | ((mcr & TI_MCR_RTS) ? TIOCM_RTS : 0)
1036                 | ((mcr & TI_MCR_LOOP) ? TIOCM_LOOP : 0)
1037                 | ((msr & TI_MSR_CTS) ? TIOCM_CTS : 0)
1038                 | ((msr & TI_MSR_CD) ? TIOCM_CAR : 0)
1039                 | ((msr & TI_MSR_RI) ? TIOCM_RI : 0)
1040                 | ((msr & TI_MSR_DSR) ? TIOCM_DSR : 0);
1041
1042         dbg("%s - 0x%04X", __FUNCTION__, result);
1043
1044         return result;
1045 }
1046
1047
1048 static int ti_tiocmset(struct usb_serial_port *port, struct file *file,
1049         unsigned int set, unsigned int clear)
1050 {
1051         struct ti_port *tport = usb_get_serial_port_data(port);
1052         unsigned int mcr;
1053
1054         dbg("%s - port %d", __FUNCTION__, port->number);
1055
1056         if (tport == NULL)
1057                 return -ENODEV;
1058
1059         mcr = tport->tp_shadow_mcr;
1060
1061         if (set & TIOCM_RTS)
1062                 mcr |= TI_MCR_RTS;
1063         if (set & TIOCM_DTR)
1064                 mcr |= TI_MCR_DTR;
1065         if (set & TIOCM_LOOP)
1066                 mcr |= TI_MCR_LOOP;
1067
1068         if (clear & TIOCM_RTS)
1069                 mcr &= ~TI_MCR_RTS;
1070         if (clear & TIOCM_DTR)
1071                 mcr &= ~TI_MCR_DTR;
1072         if (clear & TIOCM_LOOP)
1073                 mcr &= ~TI_MCR_LOOP;
1074
1075         return ti_set_mcr(tport, mcr);
1076 }
1077
1078
1079 static void ti_break(struct usb_serial_port *port, int break_state)
1080 {
1081         struct ti_port *tport = usb_get_serial_port_data(port);
1082         int status;
1083
1084         dbg("%s - state = %d", __FUNCTION__, break_state);
1085
1086         if (tport == NULL)
1087                 return;
1088
1089         ti_drain(tport, (tport->tp_closing_wait*HZ)/100, 0);
1090
1091         status = ti_write_byte(tport->tp_tdev,
1092                 tport->tp_uart_base_addr + TI_UART_OFFSET_LCR,
1093                 TI_LCR_BREAK, break_state == -1 ? TI_LCR_BREAK : 0);
1094
1095         if (status)
1096                 dbg("%s - error setting break, %d", __FUNCTION__, status);
1097 }
1098
1099
1100 static void ti_interrupt_callback(struct urb *urb)
1101 {
1102         struct ti_device *tdev = (struct ti_device *)urb->context;
1103         struct usb_serial_port *port;
1104         struct usb_serial *serial = tdev->td_serial;
1105         struct ti_port *tport;
1106         struct device *dev = &urb->dev->dev;
1107         unsigned char *data = urb->transfer_buffer;
1108         int length = urb->actual_length;
1109         int port_number;
1110         int function;
1111         int status = urb->status;
1112         int retval;
1113         __u8 msr;
1114
1115         dbg("%s", __FUNCTION__);
1116
1117         switch (status) {
1118         case 0:
1119                 break;
1120         case -ECONNRESET:
1121         case -ENOENT:
1122         case -ESHUTDOWN:
1123                 dbg("%s - urb shutting down, %d", __FUNCTION__, status);
1124                 tdev->td_urb_error = 1;
1125                 return;
1126         default:
1127                 dev_err(dev, "%s - nonzero urb status, %d\n",
1128                         __FUNCTION__, status);
1129                 tdev->td_urb_error = 1;
1130                 goto exit;
1131         }
1132
1133         if (length != 2) {
1134                 dbg("%s - bad packet size, %d", __FUNCTION__, length);
1135                 goto exit;
1136         }
1137
1138         if (data[0] == TI_CODE_HARDWARE_ERROR) {
1139                 dev_err(dev, "%s - hardware error, %d\n", __FUNCTION__, data[1]);
1140                 goto exit;
1141         }
1142
1143         port_number = TI_GET_PORT_FROM_CODE(data[0]);
1144         function = TI_GET_FUNC_FROM_CODE(data[0]);
1145
1146         dbg("%s - port_number %d, function %d, data 0x%02X", __FUNCTION__, port_number, function, data[1]);
1147
1148         if (port_number >= serial->num_ports) {
1149                 dev_err(dev, "%s - bad port number, %d\n", __FUNCTION__, port_number);
1150                 goto exit;
1151         }
1152
1153         port = serial->port[port_number];
1154
1155         tport = usb_get_serial_port_data(port);
1156         if (!tport)
1157                 goto exit;
1158
1159         switch (function) {
1160         case TI_CODE_DATA_ERROR:
1161                 dev_err(dev, "%s - DATA ERROR, port %d, data 0x%02X\n", __FUNCTION__, port_number, data[1]);
1162                 break;
1163
1164         case TI_CODE_MODEM_STATUS:
1165                 msr = data[1];
1166                 dbg("%s - port %d, msr 0x%02X", __FUNCTION__, port_number, msr);
1167                 ti_handle_new_msr(tport, msr);
1168                 break;
1169
1170         default:
1171                 dev_err(dev, "%s - unknown interrupt code, 0x%02X\n", __FUNCTION__, data[1]);
1172                 break;
1173         }
1174
1175 exit:
1176         retval = usb_submit_urb(urb, GFP_ATOMIC);
1177         if (retval)
1178                 dev_err(dev, "%s - resubmit interrupt urb failed, %d\n",
1179                         __FUNCTION__, retval);
1180 }
1181
1182
1183 static void ti_bulk_in_callback(struct urb *urb)
1184 {
1185         struct ti_port *tport = (struct ti_port *)urb->context;
1186         struct usb_serial_port *port = tport->tp_port;
1187         struct device *dev = &urb->dev->dev;
1188         int status = urb->status;
1189         int retval = 0;
1190
1191         dbg("%s", __FUNCTION__);
1192
1193         switch (status) {
1194         case 0:
1195                 break;
1196         case -ECONNRESET:
1197         case -ENOENT:
1198         case -ESHUTDOWN:
1199                 dbg("%s - urb shutting down, %d", __FUNCTION__, status);
1200                 tport->tp_tdev->td_urb_error = 1;
1201                 wake_up_interruptible(&tport->tp_write_wait);
1202                 return;
1203         default:
1204                 dev_err(dev, "%s - nonzero urb status, %d\n",
1205                         __FUNCTION__, status );
1206                 tport->tp_tdev->td_urb_error = 1;
1207                 wake_up_interruptible(&tport->tp_write_wait);
1208         }
1209
1210         if (status == -EPIPE)
1211                 goto exit;
1212
1213         if (status) {
1214                 dev_err(dev, "%s - stopping read!\n", __FUNCTION__);
1215                 return;
1216         }
1217
1218         if (port->tty && urb->actual_length) {
1219                 usb_serial_debug_data(debug, dev, __FUNCTION__,
1220                         urb->actual_length, urb->transfer_buffer);
1221
1222                 if (!tport->tp_is_open)
1223                         dbg("%s - port closed, dropping data", __FUNCTION__);
1224                 else
1225                         ti_recv(&urb->dev->dev, port->tty, urb->transfer_buffer,
1226                                 urb->actual_length);
1227
1228                 spin_lock(&tport->tp_lock);
1229                 tport->tp_icount.rx += urb->actual_length;
1230                 spin_unlock(&tport->tp_lock);
1231         }
1232
1233 exit:
1234         /* continue to read unless stopping */
1235         spin_lock(&tport->tp_lock);
1236         if (tport->tp_read_urb_state == TI_READ_URB_RUNNING) {
1237                 urb->dev = port->serial->dev;
1238                 retval = usb_submit_urb(urb, GFP_ATOMIC);
1239         } else if (tport->tp_read_urb_state == TI_READ_URB_STOPPING) {
1240                 tport->tp_read_urb_state = TI_READ_URB_STOPPED;
1241         }
1242         spin_unlock(&tport->tp_lock);
1243         if (retval)
1244                 dev_err(dev, "%s - resubmit read urb failed, %d\n",
1245                         __FUNCTION__, retval);
1246 }
1247
1248
1249 static void ti_bulk_out_callback(struct urb *urb)
1250 {
1251         struct ti_port *tport = (struct ti_port *)urb->context;
1252         struct usb_serial_port *port = tport->tp_port;
1253         struct device *dev = &urb->dev->dev;
1254         int status = urb->status;
1255
1256         dbg("%s - port %d", __FUNCTION__, port->number);
1257
1258         tport->tp_write_urb_in_use = 0;
1259
1260         switch (status) {
1261         case 0:
1262                 break;
1263         case -ECONNRESET:
1264         case -ENOENT:
1265         case -ESHUTDOWN:
1266                 dbg("%s - urb shutting down, %d", __FUNCTION__, status);
1267                 tport->tp_tdev->td_urb_error = 1;
1268                 wake_up_interruptible(&tport->tp_write_wait);
1269                 return;
1270         default:
1271                 dev_err(dev, "%s - nonzero urb status, %d\n",
1272                         __FUNCTION__, status);
1273                 tport->tp_tdev->td_urb_error = 1;
1274                 wake_up_interruptible(&tport->tp_write_wait);
1275         }
1276
1277         /* send any buffered data */
1278         ti_send(tport);
1279 }
1280
1281
1282 static void ti_recv(struct device *dev, struct tty_struct *tty,
1283         unsigned char *data, int length)
1284 {
1285         int cnt;
1286
1287         do {
1288                 cnt = tty_buffer_request_room(tty, length);
1289                 if (cnt < length) {
1290                         dev_err(dev, "%s - dropping data, %d bytes lost\n", __FUNCTION__, length - cnt);
1291                         if(cnt == 0)
1292                                 break;
1293                 }
1294                 tty_insert_flip_string(tty, data, cnt);
1295                 tty_flip_buffer_push(tty);
1296                 data += cnt;
1297                 length -= cnt;
1298         } while (length > 0);
1299
1300 }
1301
1302
1303 static void ti_send(struct ti_port *tport)
1304 {
1305         int count, result;
1306         struct usb_serial_port *port = tport->tp_port;
1307         struct tty_struct *tty = port->tty;
1308         unsigned long flags;
1309
1310
1311         dbg("%s - port %d", __FUNCTION__, port->number);
1312
1313         spin_lock_irqsave(&tport->tp_lock, flags);
1314
1315         if (tport->tp_write_urb_in_use) {
1316                 spin_unlock_irqrestore(&tport->tp_lock, flags);
1317                 return;
1318         }
1319
1320         count = ti_buf_get(tport->tp_write_buf,
1321                                 port->write_urb->transfer_buffer,
1322                                 port->bulk_out_size);
1323
1324         if (count == 0) {
1325                 spin_unlock_irqrestore(&tport->tp_lock, flags);
1326                 return;
1327         }
1328
1329         tport->tp_write_urb_in_use = 1;
1330
1331         spin_unlock_irqrestore(&tport->tp_lock, flags);
1332
1333         usb_serial_debug_data(debug, &port->dev, __FUNCTION__, count, port->write_urb->transfer_buffer);
1334
1335         usb_fill_bulk_urb(port->write_urb, port->serial->dev,
1336                            usb_sndbulkpipe(port->serial->dev,
1337                                             port->bulk_out_endpointAddress),
1338                            port->write_urb->transfer_buffer, count,
1339                            ti_bulk_out_callback, tport);
1340
1341         result = usb_submit_urb(port->write_urb, GFP_ATOMIC);
1342         if (result) {
1343                 dev_err(&port->dev, "%s - submit write urb failed, %d\n", __FUNCTION__, result);
1344                 tport->tp_write_urb_in_use = 0;
1345                 /* TODO: reschedule ti_send */
1346         } else {
1347                 spin_lock_irqsave(&tport->tp_lock, flags);
1348                 tport->tp_icount.tx += count;
1349                 spin_unlock_irqrestore(&tport->tp_lock, flags);
1350         }
1351
1352         /* more room in the buffer for new writes, wakeup */
1353         if (tty)
1354                 tty_wakeup(tty);
1355         wake_up_interruptible(&tport->tp_write_wait);
1356 }
1357
1358
1359 static int ti_set_mcr(struct ti_port *tport, unsigned int mcr)
1360 {
1361         int status;
1362
1363         status = ti_write_byte(tport->tp_tdev,
1364                 tport->tp_uart_base_addr + TI_UART_OFFSET_MCR,
1365                 TI_MCR_RTS | TI_MCR_DTR | TI_MCR_LOOP, mcr);
1366
1367         if (!status)
1368                 tport->tp_shadow_mcr = mcr;
1369
1370         return status;
1371 }
1372
1373
1374 static int ti_get_lsr(struct ti_port *tport)
1375 {
1376         int size,status;
1377         struct ti_device *tdev = tport->tp_tdev;
1378         struct usb_serial_port *port = tport->tp_port;
1379         int port_number = port->number - port->serial->minor;
1380         struct ti_port_status *data;
1381
1382         dbg("%s - port %d", __FUNCTION__, port->number);
1383
1384         size = sizeof(struct ti_port_status);
1385         data = kmalloc(size, GFP_KERNEL);
1386         if (!data) {
1387                 dev_err(&port->dev, "%s - out of memory\n", __FUNCTION__);
1388                 return -ENOMEM;
1389         }
1390
1391         status = ti_command_in_sync(tdev, TI_GET_PORT_STATUS,
1392                 (__u8)(TI_UART1_PORT+port_number), 0, (__u8 *)data, size);
1393         if (status) {
1394                 dev_err(&port->dev, "%s - get port status command failed, %d\n", __FUNCTION__, status);
1395                 goto free_data;
1396         }
1397
1398         dbg("%s - lsr 0x%02X", __FUNCTION__, data->bLSR);
1399
1400         tport->tp_lsr = data->bLSR;
1401
1402 free_data:
1403         kfree(data);
1404         return status;
1405 }
1406
1407
1408 static int ti_get_serial_info(struct ti_port *tport,
1409         struct serial_struct __user *ret_arg)
1410 {
1411         struct usb_serial_port *port = tport->tp_port;
1412         struct serial_struct ret_serial;
1413
1414         if (!ret_arg)
1415                 return -EFAULT;
1416
1417         memset(&ret_serial, 0, sizeof(ret_serial));
1418
1419         ret_serial.type = PORT_16550A;
1420         ret_serial.line = port->serial->minor;
1421         ret_serial.port = port->number - port->serial->minor;
1422         ret_serial.flags = tport->tp_flags;
1423         ret_serial.xmit_fifo_size = TI_WRITE_BUF_SIZE;
1424         ret_serial.baud_base = tport->tp_tdev->td_is_3410 ? 921600 : 460800;
1425         ret_serial.closing_wait = tport->tp_closing_wait;
1426
1427         if (copy_to_user(ret_arg, &ret_serial, sizeof(*ret_arg)))
1428                 return -EFAULT;
1429
1430         return 0;
1431 }
1432
1433
1434 static int ti_set_serial_info(struct ti_port *tport,
1435         struct serial_struct __user *new_arg)
1436 {
1437         struct usb_serial_port *port = tport->tp_port;
1438         struct serial_struct new_serial;
1439
1440         if (copy_from_user(&new_serial, new_arg, sizeof(new_serial)))
1441                 return -EFAULT;
1442
1443         tport->tp_flags = new_serial.flags & TI_SET_SERIAL_FLAGS;
1444         if (port->tty)
1445                 port->tty->low_latency =
1446                         (tport->tp_flags & ASYNC_LOW_LATENCY) ? 1 : 0;
1447         tport->tp_closing_wait = new_serial.closing_wait;
1448
1449         return 0;
1450 }
1451
1452
1453 static void ti_handle_new_msr(struct ti_port *tport, __u8 msr)
1454 {
1455         struct async_icount *icount;
1456         struct tty_struct *tty;
1457         unsigned long flags;
1458
1459         dbg("%s - msr 0x%02X", __FUNCTION__, msr);
1460
1461         if (msr & TI_MSR_DELTA_MASK) {
1462                 spin_lock_irqsave(&tport->tp_lock, flags);
1463                 icount = &tport->tp_icount;
1464                 if (msr & TI_MSR_DELTA_CTS)
1465                         icount->cts++;
1466                 if (msr & TI_MSR_DELTA_DSR)
1467                         icount->dsr++;
1468                 if (msr & TI_MSR_DELTA_CD)
1469                         icount->dcd++;
1470                 if (msr & TI_MSR_DELTA_RI)
1471                         icount->rng++;
1472                 wake_up_interruptible(&tport->tp_msr_wait);
1473                 spin_unlock_irqrestore(&tport->tp_lock, flags);
1474         }
1475
1476         tport->tp_msr = msr & TI_MSR_MASK;
1477
1478         /* handle CTS flow control */
1479         tty = tport->tp_port->tty;
1480         if (tty && C_CRTSCTS(tty)) {
1481                 if (msr & TI_MSR_CTS) {
1482                         tty->hw_stopped = 0;
1483                         tty_wakeup(tty);
1484                 } else {
1485                         tty->hw_stopped = 1;
1486                 }
1487         }
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", __FUNCTION__, 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", __FUNCTION__, addr, mask, byte);
1630
1631         size = sizeof(struct ti_write_data_bytes) + 2;
1632         data = kmalloc(size, GFP_KERNEL);
1633         if (!data) {
1634                 dev_err(dev, "%s - out of memory\n", __FUNCTION__);
1635                 return -ENOMEM;
1636         }
1637
1638         data->bAddrType = TI_RW_DATA_ADDR_XDATA;
1639         data->bDataType = TI_RW_DATA_BYTE;
1640         data->bDataCounter = 1;
1641         data->wBaseAddrHi = cpu_to_be16(addr>>16);
1642         data->wBaseAddrLo = cpu_to_be16(addr);
1643         data->bData[0] = mask;
1644         data->bData[1] = byte;
1645
1646         status = ti_command_out_sync(tdev, TI_WRITE_DATA, TI_RAM_PORT, 0,
1647                 (__u8 *)data, size);
1648
1649         if (status < 0)
1650                 dev_err(dev, "%s - failed, %d\n", __FUNCTION__, status);
1651
1652         kfree(data);
1653
1654         return status;
1655 }
1656
1657
1658 static int ti_download_firmware(struct ti_device *tdev,
1659         unsigned char *firmware, unsigned int firmware_size)
1660 {
1661         int status = 0;
1662         int buffer_size;
1663         int pos;
1664         int len;
1665         int done;
1666         __u8 cs = 0;
1667         __u8 *buffer;
1668         struct usb_device *dev = tdev->td_serial->dev;
1669         struct ti_firmware_header *header;
1670         unsigned int pipe = usb_sndbulkpipe(dev,
1671                 tdev->td_serial->port[0]->bulk_out_endpointAddress);
1672
1673
1674         buffer_size = TI_FIRMWARE_BUF_SIZE + sizeof(struct ti_firmware_header);
1675         buffer = kmalloc(buffer_size, GFP_KERNEL);
1676         if (!buffer) {
1677                 dev_err(&dev->dev, "%s - out of memory\n", __FUNCTION__);
1678                 return -ENOMEM;
1679         }
1680
1681         memcpy(buffer, firmware, firmware_size);
1682         memset(buffer+firmware_size, 0xff, buffer_size-firmware_size);
1683
1684         for(pos = sizeof(struct ti_firmware_header); pos < buffer_size; pos++)
1685                 cs = (__u8)(cs + buffer[pos]);
1686
1687         header = (struct ti_firmware_header *)buffer;
1688         header->wLength = cpu_to_le16((__u16)(buffer_size - sizeof(struct ti_firmware_header)));
1689         header->bCheckSum = cs;
1690
1691         dbg("%s - downloading firmware", __FUNCTION__);
1692         for (pos = 0; pos < buffer_size; pos += done) {
1693                 len = min(buffer_size - pos, TI_DOWNLOAD_MAX_PACKET_SIZE);
1694                 status = usb_bulk_msg(dev, pipe, buffer+pos, len, &done, 1000);
1695                 if (status)
1696                         break;
1697         }
1698
1699         kfree(buffer);
1700
1701         if (status) {
1702                 dev_err(&dev->dev, "%s - error downloading firmware, %d\n", __FUNCTION__, status);
1703                 return status;
1704         }
1705
1706         dbg("%s - download successful", __FUNCTION__);
1707
1708         return 0;
1709 }
1710
1711
1712 /* Circular Buffer Functions */
1713
1714 /*
1715  * ti_buf_alloc
1716  *
1717  * Allocate a circular buffer and all associated memory.
1718  */
1719
1720 static struct circ_buf *ti_buf_alloc(void)
1721 {
1722         struct circ_buf *cb;
1723
1724         cb = kmalloc(sizeof(struct circ_buf), GFP_KERNEL);
1725         if (cb == NULL)
1726                 return NULL;
1727
1728         cb->buf = kmalloc(TI_WRITE_BUF_SIZE, GFP_KERNEL);
1729         if (cb->buf == NULL) {
1730                 kfree(cb);
1731                 return NULL;
1732         }
1733
1734         ti_buf_clear(cb);
1735
1736         return cb;
1737 }
1738
1739
1740 /*
1741  * ti_buf_free
1742  *
1743  * Free the buffer and all associated memory.
1744  */
1745
1746 static void ti_buf_free(struct circ_buf *cb)
1747 {
1748         kfree(cb->buf);
1749         kfree(cb);
1750 }
1751
1752
1753 /*
1754  * ti_buf_clear
1755  *
1756  * Clear out all data in the circular buffer.
1757  */
1758
1759 static void ti_buf_clear(struct circ_buf *cb)
1760 {
1761         cb->head = cb->tail = 0;
1762 }
1763
1764
1765 /*
1766  * ti_buf_data_avail
1767  *
1768  * Return the number of bytes of data available in the circular
1769  * buffer.
1770  */
1771
1772 static int ti_buf_data_avail(struct circ_buf *cb)
1773 {
1774         return CIRC_CNT(cb->head,cb->tail,TI_WRITE_BUF_SIZE);
1775 }
1776
1777
1778 /*
1779  * ti_buf_space_avail
1780  *
1781  * Return the number of bytes of space available in the circular
1782  * buffer.
1783  */
1784
1785 static int ti_buf_space_avail(struct circ_buf *cb)
1786 {
1787         return CIRC_SPACE(cb->head,cb->tail,TI_WRITE_BUF_SIZE);
1788 }
1789
1790
1791 /*
1792  * ti_buf_put
1793  *
1794  * Copy data data from a user buffer and put it into the circular buffer.
1795  * Restrict to the amount of space available.
1796  *
1797  * Return the number of bytes copied.
1798  */
1799
1800 static int ti_buf_put(struct circ_buf *cb, const char *buf, int count)
1801 {
1802         int c, ret = 0;
1803
1804         while (1) {
1805                 c = CIRC_SPACE_TO_END(cb->head, cb->tail, TI_WRITE_BUF_SIZE);
1806                 if (count < c)
1807                         c = count;
1808                 if (c <= 0)
1809                         break;
1810                 memcpy(cb->buf + cb->head, buf, c);
1811                 cb->head = (cb->head + c) & (TI_WRITE_BUF_SIZE-1);
1812                 buf += c;
1813                 count -= c;
1814                 ret += c;
1815         }
1816
1817         return ret;
1818 }
1819
1820
1821 /*
1822  * ti_buf_get
1823  *
1824  * Get data from the circular buffer and copy to the given buffer.
1825  * Restrict to the amount of data available.
1826  *
1827  * Return the number of bytes copied.
1828  */
1829
1830 static int ti_buf_get(struct circ_buf *cb, char *buf, int count)
1831 {
1832         int c, ret = 0;
1833
1834         while (1) {
1835                 c = CIRC_CNT_TO_END(cb->head, cb->tail, TI_WRITE_BUF_SIZE);
1836                 if (count < c)
1837                         c = count;
1838                 if (c <= 0)
1839                         break;
1840                 memcpy(buf, cb->buf + cb->tail, c);
1841                 cb->tail = (cb->tail + c) & (TI_WRITE_BUF_SIZE-1);
1842                 buf += c;
1843                 count -= c;
1844                 ret += c;
1845         }
1846
1847         return ret;
1848 }