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