vcs.maemo.org Git - kernel-power/blob - usbhost/drivers/usb2/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[10+TI_EXTRA_VID_PID_COUNT+1] = {
 180         { USB_DEVICE(TI_VENDOR_ID, TI_3410_PRODUCT_ID) },
 181         { USB_DEVICE(TI_VENDOR_ID, TI_3410_EZ430_ID) },
 182         { USB_DEVICE(IBM_VENDOR_ID, IBM_4543_PRODUCT_ID) },
 183         { USB_DEVICE(IBM_VENDOR_ID, IBM_454B_PRODUCT_ID) },
 184         { USB_DEVICE(IBM_VENDOR_ID, IBM_454C_PRODUCT_ID) },
 185 };
 186
 187 static struct usb_device_id ti_id_table_5052[5+TI_EXTRA_VID_PID_COUNT+1] = {
 188         { USB_DEVICE(TI_VENDOR_ID, TI_5052_BOOT_PRODUCT_ID) },
 189         { USB_DEVICE(TI_VENDOR_ID, TI_5152_BOOT_PRODUCT_ID) },
 190         { USB_DEVICE(TI_VENDOR_ID, TI_5052_EEPROM_PRODUCT_ID) },
 191         { USB_DEVICE(TI_VENDOR_ID, TI_5052_FIRMWARE_PRODUCT_ID) },
 192         { USB_DEVICE(IBM_VENDOR_ID, IBM_4543_PRODUCT_ID) },
 193 };
 194
 195 static struct usb_device_id ti_id_table_combined[14+2*TI_EXTRA_VID_PID_COUNT+1] = {
 196         { USB_DEVICE(TI_VENDOR_ID, TI_3410_PRODUCT_ID) },
 197         { USB_DEVICE(TI_VENDOR_ID, TI_3410_EZ430_ID) },
 198         { USB_DEVICE(TI_VENDOR_ID, TI_5052_BOOT_PRODUCT_ID) },
 199         { USB_DEVICE(TI_VENDOR_ID, TI_5152_BOOT_PRODUCT_ID) },
 200         { USB_DEVICE(TI_VENDOR_ID, TI_5052_EEPROM_PRODUCT_ID) },
 201         { USB_DEVICE(TI_VENDOR_ID, TI_5052_FIRMWARE_PRODUCT_ID) },
 202         { USB_DEVICE(IBM_VENDOR_ID, IBM_4543_PRODUCT_ID) },
 203         { USB_DEVICE(IBM_VENDOR_ID, IBM_454B_PRODUCT_ID) },
 204         { USB_DEVICE(IBM_VENDOR_ID, IBM_454C_PRODUCT_ID) },
 205         { }
 206 };
 207
 208 static struct usb_driver ti_usb_driver = {
 209         .name                   = "ti_usb_3410_5052",
 210         .probe                  = usb_serial_probe,
 211         .disconnect             = usb_serial_disconnect,
 212         .id_table               = ti_id_table_combined,
 213         .no_dynamic_id =        1,
 214 };
 215
 216 static struct usb_serial_driver ti_1port_device = {
 217         .driver = {
 218                 .owner          = THIS_MODULE,
 219                 .name           = "ti_usb_3410_5052_1",
 220         },
 221         .description            = "TI USB 3410 1 port adapter",
 222         .usb_driver             = &ti_usb_driver,
 223         .id_table               = ti_id_table_3410,
 224         .num_ports              = 1,
 225         .attach                 = ti_startup,
 226         .shutdown               = ti_shutdown,
 227         .open                   = ti_open,
 228         .close                  = ti_close,
 229         .write                  = ti_write,
 230         .write_room             = ti_write_room,
 231         .chars_in_buffer        = ti_chars_in_buffer,
 232         .throttle               = ti_throttle,
 233         .unthrottle             = ti_unthrottle,
 234         .ioctl                  = ti_ioctl,
 235         .set_termios            = ti_set_termios,
 236         .tiocmget               = ti_tiocmget,
 237         .tiocmset               = ti_tiocmset,
 238         .break_ctl              = ti_break,
 239         .read_int_callback      = ti_interrupt_callback,
 240         .read_bulk_callback     = ti_bulk_in_callback,
 241         .write_bulk_callback    = ti_bulk_out_callback,
 242 };
 243
 244 static struct usb_serial_driver ti_2port_device = {
 245         .driver = {
 246                 .owner          = THIS_MODULE,
 247                 .name           = "ti_usb_3410_5052_2",
 248         },
 249         .description            = "TI USB 5052 2 port adapter",
 250         .usb_driver             = &ti_usb_driver,
 251         .id_table               = ti_id_table_5052,
 252         .num_ports              = 2,
 253         .attach                 = ti_startup,
 254         .shutdown               = ti_shutdown,
 255         .open                   = ti_open,
 256         .close                  = ti_close,
 257         .write                  = ti_write,
 258         .write_room             = ti_write_room,
 259         .chars_in_buffer        = ti_chars_in_buffer,
 260         .throttle               = ti_throttle,
 261         .unthrottle             = ti_unthrottle,
 262         .ioctl                  = ti_ioctl,
 263         .set_termios            = ti_set_termios,
 264         .tiocmget               = ti_tiocmget,
 265         .tiocmset               = ti_tiocmset,
 266         .break_ctl              = ti_break,
 267         .read_int_callback      = ti_interrupt_callback,
 268         .read_bulk_callback     = ti_bulk_in_callback,
 269         .write_bulk_callback    = ti_bulk_out_callback,
 270 };
 271
 272
 273 /* Module */
 274
 275 MODULE_AUTHOR(TI_DRIVER_AUTHOR);
 276 MODULE_DESCRIPTION(TI_DRIVER_DESC);
 277 MODULE_VERSION(TI_DRIVER_VERSION);
 278 MODULE_LICENSE("GPL");
 279
 280 MODULE_FIRMWARE("ti_3410.fw");
 281 MODULE_FIRMWARE("ti_5052.fw");
 282
 283 module_param(debug, bool, S_IRUGO | S_IWUSR);
 284 MODULE_PARM_DESC(debug, "Enable debugging, 0=no, 1=yes");
 285
 286 module_param(low_latency, bool, S_IRUGO | S_IWUSR);
 287 MODULE_PARM_DESC(low_latency,
 288                 "TTY low_latency flag, 0=off, 1=on, default is off");
 289
 290 module_param(closing_wait, int, S_IRUGO | S_IWUSR);
 291 MODULE_PARM_DESC(closing_wait,
 292     "Maximum wait for data to drain in close, in .01 secs, default is 4000");
 293
 294 module_param_array(vendor_3410, ushort, &vendor_3410_count, S_IRUGO);
 295 MODULE_PARM_DESC(vendor_3410,
 296                 "Vendor ids for 3410 based devices, 1-5 short integers");
 297 module_param_array(product_3410, ushort, &product_3410_count, S_IRUGO);
 298 MODULE_PARM_DESC(product_3410,
 299                 "Product ids for 3410 based devices, 1-5 short integers");
 300 module_param_array(vendor_5052, ushort, &vendor_5052_count, S_IRUGO);
 301 MODULE_PARM_DESC(vendor_5052,
 302                 "Vendor ids for 5052 based devices, 1-5 short integers");
 303 module_param_array(product_5052, ushort, &product_5052_count, S_IRUGO);
 304 MODULE_PARM_DESC(product_5052,
 305                 "Product ids for 5052 based devices, 1-5 short integers");
 306
 307 MODULE_DEVICE_TABLE(usb, ti_id_table_combined);
 308
 309
 310 /* Functions */
 311
 312 static int __init ti_init(void)
 313 {
 314         int i, j;
 315         int ret;
 316
 317         /* insert extra vendor and product ids */
 318         j = ARRAY_SIZE(ti_id_table_3410) - TI_EXTRA_VID_PID_COUNT - 1;
 319         for (i = 0; i < min(vendor_3410_count, product_3410_count); i++, j++) {
 320                 ti_id_table_3410[j].idVendor = vendor_3410[i];
 321                 ti_id_table_3410[j].idProduct = product_3410[i];
 322                 ti_id_table_3410[j].match_flags = USB_DEVICE_ID_MATCH_DEVICE;
 323         }
 324         j = ARRAY_SIZE(ti_id_table_5052) - TI_EXTRA_VID_PID_COUNT - 1;
 325         for (i = 0; i < min(vendor_5052_count, product_5052_count); i++, j++) {
 326                 ti_id_table_5052[j].idVendor = vendor_5052[i];
 327                 ti_id_table_5052[j].idProduct = product_5052[i];
 328                 ti_id_table_5052[j].match_flags = USB_DEVICE_ID_MATCH_DEVICE;
 329         }
 330
 331         ret = usb_serial_register(&ti_1port_device);
 332         if (ret)
 333                 goto failed_1port;
 334         ret = usb_serial_register(&ti_2port_device);
 335         if (ret)
 336                 goto failed_2port;
 337
 338         ret = usb_register(&ti_usb_driver);
 339         if (ret)
 340                 goto failed_usb;
 341
 342         printk(KERN_INFO KBUILD_MODNAME ": " TI_DRIVER_VERSION ":"
 343                TI_DRIVER_DESC "\n");
 344
 345         return 0;
 346
 347 failed_usb:
 348         usb_serial_deregister(&ti_2port_device);
 349 failed_2port:
 350         usb_serial_deregister(&ti_1port_device);
 351 failed_1port:
 352         return ret;
 353 }
 354
 355
 356 static void __exit ti_exit(void)
 357 {
 358         usb_serial_deregister(&ti_1port_device);
 359         usb_serial_deregister(&ti_2port_device);
 360         usb_deregister(&ti_usb_driver);
 361 }
 362
 363
 364 module_init(ti_init);
 365 module_exit(ti_exit);
 366
 367
 368 static int ti_startup(struct usb_serial *serial)
 369 {
 370         struct ti_device *tdev;
 371         struct ti_port *tport;
 372         struct usb_device *dev = serial->dev;
 373         int status;
 374         int i;
 375
 376
 377         dbg("%s - product 0x%4X, num configurations %d, configuration value %d",
 378             __func__, le16_to_cpu(dev->descriptor.idProduct),
 379             dev->descriptor.bNumConfigurations,
 380             dev->actconfig->desc.bConfigurationValue);
 381
 382         /* create device structure */
 383         tdev = kzalloc(sizeof(struct ti_device), GFP_KERNEL);
 384         if (tdev == NULL) {
 385                 dev_err(&dev->dev, "%s - out of memory\n", __func__);
 386                 return -ENOMEM;
 387         }
 388         mutex_init(&tdev->td_open_close_lock);
 389         tdev->td_serial = serial;
 390         usb_set_serial_data(serial, tdev);
 391
 392         /* determine device type */
 393         if (usb_match_id(serial->interface, ti_id_table_3410))
 394                 tdev->td_is_3410 = 1;
 395         dbg("%s - device type is %s", __func__,
 396                                 tdev->td_is_3410 ? "3410" : "5052");
 397
 398         /* if we have only 1 configuration, download firmware */
 399         if (dev->descriptor.bNumConfigurations == 1) {
 400                 if (tdev->td_is_3410)
 401                         status = ti_download_firmware(tdev, 3410);
 402                 else
 403                         status = ti_download_firmware(tdev, 5052);
 404                 if (status)
 405                         goto free_tdev;
 406
 407                 /* 3410 must be reset, 5052 resets itself */
 408                 if (tdev->td_is_3410) {
 409                         msleep_interruptible(100);
 410                         usb_reset_device(dev);
 411                 }
 412
 413                 status = -ENODEV;
 414                 goto free_tdev;
 415         }
 416
 417         /* the second configuration must be set */
 418         if (dev->actconfig->desc.bConfigurationValue == TI_BOOT_CONFIG) {
 419                 status = usb_driver_set_configuration(dev, TI_ACTIVE_CONFIG);
 420                 status = status ? status : -ENODEV;
 421                 goto free_tdev;
 422         }
 423
 424         /* set up port structures */
 425         for (i = 0; i < serial->num_ports; ++i) {
 426                 tport = kzalloc(sizeof(struct ti_port), GFP_KERNEL);
 427                 if (tport == NULL) {
 428                         dev_err(&dev->dev, "%s - out of memory\n", __func__);
 429                         status = -ENOMEM;
 430                         goto free_tports;
 431                 }
 432                 spin_lock_init(&tport->tp_lock);
 433                 tport->tp_uart_base_addr = (i == 0 ?
 434                                 TI_UART1_BASE_ADDR : TI_UART2_BASE_ADDR);
 435                 tport->tp_flags = low_latency ? ASYNC_LOW_LATENCY : 0;
 436                 tport->tp_closing_wait = closing_wait;
 437                 init_waitqueue_head(&tport->tp_msr_wait);
 438                 init_waitqueue_head(&tport->tp_write_wait);
 439                 tport->tp_write_buf = ti_buf_alloc();
 440                 if (tport->tp_write_buf == NULL) {
 441                         dev_err(&dev->dev, "%s - out of memory\n", __func__);
 442                         kfree(tport);
 443                         status = -ENOMEM;
 444                         goto free_tports;
 445                 }
 446                 tport->tp_port = serial->port[i];
 447                 tport->tp_tdev = tdev;
 448                 usb_set_serial_port_data(serial->port[i], tport);
 449                 tport->tp_uart_mode = 0;        /* default is RS232 */
 450         }
 451
 452         return 0;
 453
 454 free_tports:
 455         for (--i; i >= 0; --i) {
 456                 tport = usb_get_serial_port_data(serial->port[i]);
 457                 ti_buf_free(tport->tp_write_buf);
 458                 kfree(tport);
 459                 usb_set_serial_port_data(serial->port[i], NULL);
 460         }
 461 free_tdev:
 462         kfree(tdev);
 463         usb_set_serial_data(serial, NULL);
 464         return status;
 465 }
 466
 467
 468 static void ti_shutdown(struct usb_serial *serial)
 469 {
 470         int i;
 471         struct ti_device *tdev = usb_get_serial_data(serial);
 472         struct ti_port *tport;
 473
 474         dbg("%s", __func__);
 475
 476         for (i = 0; i < serial->num_ports; ++i) {
 477                 tport = usb_get_serial_port_data(serial->port[i]);
 478                 if (tport) {
 479                         ti_buf_free(tport->tp_write_buf);
 480                         kfree(tport);
 481                         usb_set_serial_port_data(serial->port[i], NULL);
 482                 }
 483         }
 484
 485         kfree(tdev);
 486         usb_set_serial_data(serial, NULL);
 487 }
 488
 489
 490 static int ti_open(struct tty_struct *tty,
 491                         struct usb_serial_port *port, struct file *file)
 492 {
 493         struct ti_port *tport = usb_get_serial_port_data(port);
 494         struct ti_device *tdev;
 495         struct usb_device *dev;
 496         struct urb *urb;
 497         int port_number;
 498         int status;
 499         __u16 open_settings = (__u8)(TI_PIPE_MODE_CONTINOUS |
 500                              TI_PIPE_TIMEOUT_ENABLE |
 501                              (TI_TRANSFER_TIMEOUT << 2));
 502
 503         dbg("%s - port %d", __func__, port->number);
 504
 505         if (tport == NULL)
 506                 return -ENODEV;
 507
 508         dev = port->serial->dev;
 509         tdev = tport->tp_tdev;
 510
 511         /* only one open on any port on a device at a time */
 512         if (mutex_lock_interruptible(&tdev->td_open_close_lock))
 513                 return -ERESTARTSYS;
 514
 515         if (tty)
 516                 tty->low_latency =
 517                                 (tport->tp_flags & ASYNC_LOW_LATENCY) ? 1 : 0;
 518
 519         port_number = port->number - port->serial->minor;
 520
 521         memset(&(tport->tp_icount), 0x00, sizeof(tport->tp_icount));
 522
 523         tport->tp_msr = 0;
 524         tport->tp_shadow_mcr |= (TI_MCR_RTS | TI_MCR_DTR);
 525
 526         /* start interrupt urb the first time a port is opened on this device */
 527         if (tdev->td_open_port_count == 0) {
 528                 dbg("%s - start interrupt in urb", __func__);
 529                 urb = tdev->td_serial->port[0]->interrupt_in_urb;
 530                 if (!urb) {
 531                         dev_err(&port->dev, "%s - no interrupt urb\n",
 532                                                                 __func__);
 533                         status = -EINVAL;
 534                         goto release_lock;
 535                 }
 536                 urb->complete = ti_interrupt_callback;
 537                 urb->context = tdev;
 538                 urb->dev = dev;
 539                 status = usb_submit_urb(urb, GFP_KERNEL);
 540                 if (status) {
 541                         dev_err(&port->dev,
 542                                 "%s - submit interrupt urb failed, %d\n",
 543                                         __func__, status);
 544                         goto release_lock;
 545                 }
 546         }
 547
 548         if (tty)
 549                 ti_set_termios(tty, port, tty->termios);
 550
 551         dbg("%s - sending TI_OPEN_PORT", __func__);
 552         status = ti_command_out_sync(tdev, TI_OPEN_PORT,
 553                 (__u8)(TI_UART1_PORT + port_number), open_settings, NULL, 0);
 554         if (status) {
 555                 dev_err(&port->dev, "%s - cannot send open command, %d\n",
 556                                                         __func__, status);
 557                 goto unlink_int_urb;
 558         }
 559
 560         dbg("%s - sending TI_START_PORT", __func__);
 561         status = ti_command_out_sync(tdev, TI_START_PORT,
 562                 (__u8)(TI_UART1_PORT + port_number), 0, NULL, 0);
 563         if (status) {
 564                 dev_err(&port->dev, "%s - cannot send start command, %d\n",
 565                                                         __func__, status);
 566                 goto unlink_int_urb;
 567         }
 568
 569         dbg("%s - sending TI_PURGE_PORT", __func__);
 570         status = ti_command_out_sync(tdev, TI_PURGE_PORT,
 571                 (__u8)(TI_UART1_PORT + port_number), TI_PURGE_INPUT, NULL, 0);
 572         if (status) {
 573                 dev_err(&port->dev, "%s - cannot clear input buffers, %d\n",
 574                                                         __func__, status);
 575                 goto unlink_int_urb;
 576         }
 577         status = ti_command_out_sync(tdev, TI_PURGE_PORT,
 578                 (__u8)(TI_UART1_PORT + port_number), TI_PURGE_OUTPUT, NULL, 0);
 579         if (status) {
 580                 dev_err(&port->dev, "%s - cannot clear output buffers, %d\n",
 581                                                         __func__, status);
 582                 goto unlink_int_urb;
 583         }
 584
 585         /* reset the data toggle on the bulk endpoints to work around bug in
 586          * host controllers where things get out of sync some times */
 587         usb_clear_halt(dev, port->write_urb->pipe);
 588         usb_clear_halt(dev, port->read_urb->pipe);
 589
 590         if (tty)
 591                 ti_set_termios(tty, port, tty->termios);
 592
 593         dbg("%s - sending TI_OPEN_PORT (2)", __func__);
 594         status = ti_command_out_sync(tdev, TI_OPEN_PORT,
 595                 (__u8)(TI_UART1_PORT + port_number), open_settings, NULL, 0);
 596         if (status) {
 597                 dev_err(&port->dev, "%s - cannot send open command (2), %d\n",
 598                                                         __func__, status);
 599                 goto unlink_int_urb;
 600         }
 601
 602         dbg("%s - sending TI_START_PORT (2)", __func__);
 603         status = ti_command_out_sync(tdev, TI_START_PORT,
 604                 (__u8)(TI_UART1_PORT + port_number), 0, NULL, 0);
 605         if (status) {
 606                 dev_err(&port->dev, "%s - cannot send start command (2), %d\n",
 607                                                         __func__, status);
 608                 goto unlink_int_urb;
 609         }
 610
 611         /* start read urb */
 612         dbg("%s - start read urb", __func__);
 613         urb = port->read_urb;
 614         if (!urb) {
 615                 dev_err(&port->dev, "%s - no read urb\n", __func__);
 616                 status = -EINVAL;
 617                 goto unlink_int_urb;
 618         }
 619         tport->tp_read_urb_state = TI_READ_URB_RUNNING;
 620         urb->complete = ti_bulk_in_callback;
 621         urb->context = tport;
 622         urb->dev = dev;
 623         status = usb_submit_urb(urb, GFP_KERNEL);
 624         if (status) {
 625                 dev_err(&port->dev, "%s - submit read urb failed, %d\n",
 626                                                         __func__, status);
 627                 goto unlink_int_urb;
 628         }
 629
 630         tport->tp_is_open = 1;
 631         ++tdev->td_open_port_count;
 632
 633         goto release_lock;
 634
 635 unlink_int_urb:
 636         if (tdev->td_open_port_count == 0)
 637                 usb_kill_urb(port->serial->port[0]->interrupt_in_urb);
 638 release_lock:
 639         mutex_unlock(&tdev->td_open_close_lock);
 640         dbg("%s - exit %d", __func__, status);
 641         return status;
 642 }
 643
 644
 645 static void ti_close(struct tty_struct *tty, struct usb_serial_port *port,
 646                                                         struct file *file)
 647 {
 648         struct ti_device *tdev;
 649         struct ti_port *tport;
 650         int port_number;
 651         int status;
 652         int do_unlock;
 653
 654         dbg("%s - port %d", __func__, port->number);
 655
 656         tdev = usb_get_serial_data(port->serial);
 657         tport = usb_get_serial_port_data(port);
 658         if (tdev == NULL || tport == NULL)
 659                 return;
 660
 661         tport->tp_is_open = 0;
 662
 663         ti_drain(tport, (tport->tp_closing_wait*HZ)/100, 1);
 664
 665         usb_kill_urb(port->read_urb);
 666         usb_kill_urb(port->write_urb);
 667         tport->tp_write_urb_in_use = 0;
 668
 669         port_number = port->number - port->serial->minor;
 670
 671         dbg("%s - sending TI_CLOSE_PORT", __func__);
 672         status = ti_command_out_sync(tdev, TI_CLOSE_PORT,
 673                      (__u8)(TI_UART1_PORT + port_number), 0, NULL, 0);
 674         if (status)
 675                 dev_err(&port->dev,
 676                         "%s - cannot send close port command, %d\n"
 677                                                         , __func__, status);
 678
 679         /* if mutex_lock is interrupted, continue anyway */
 680         do_unlock = !mutex_lock_interruptible(&tdev->td_open_close_lock);
 681         --tport->tp_tdev->td_open_port_count;
 682         if (tport->tp_tdev->td_open_port_count <= 0) {
 683                 /* last port is closed, shut down interrupt urb */
 684                 usb_kill_urb(port->serial->port[0]->interrupt_in_urb);
 685                 tport->tp_tdev->td_open_port_count = 0;
 686         }
 687         if (do_unlock)
 688                 mutex_unlock(&tdev->td_open_close_lock);
 689
 690         dbg("%s - exit", __func__);
 691 }
 692
 693
 694 static int ti_write(struct tty_struct *tty, struct usb_serial_port *port,
 695                         const unsigned char *data, int count)
 696 {
 697         struct ti_port *tport = usb_get_serial_port_data(port);
 698         unsigned long flags;
 699
 700         dbg("%s - port %d", __func__, port->number);
 701
 702         if (count == 0) {
 703                 dbg("%s - write request of 0 bytes", __func__);
 704                 return 0;
 705         }
 706
 707         if (tport == NULL || !tport->tp_is_open)
 708                 return -ENODEV;
 709
 710         spin_lock_irqsave(&tport->tp_lock, flags);
 711         count = ti_buf_put(tport->tp_write_buf, data, count);
 712         spin_unlock_irqrestore(&tport->tp_lock, flags);
 713
 714         ti_send(tport);
 715
 716         return count;
 717 }
 718
 719
 720 static int ti_write_room(struct tty_struct *tty)
 721 {
 722         struct usb_serial_port *port = tty->driver_data;
 723         struct ti_port *tport = usb_get_serial_port_data(port);
 724         int room = 0;
 725         unsigned long flags;
 726
 727         dbg("%s - port %d", __func__, port->number);
 728
 729         if (tport == NULL)
 730                 return -ENODEV;
 731
 732         spin_lock_irqsave(&tport->tp_lock, flags);
 733         room = ti_buf_space_avail(tport->tp_write_buf);
 734         spin_unlock_irqrestore(&tport->tp_lock, flags);
 735
 736         dbg("%s - returns %d", __func__, room);
 737         return room;
 738 }
 739
 740
 741 static int ti_chars_in_buffer(struct tty_struct *tty)
 742 {
 743         struct usb_serial_port *port = tty->driver_data;
 744         struct ti_port *tport = usb_get_serial_port_data(port);
 745         int chars = 0;
 746         unsigned long flags;
 747
 748         dbg("%s - port %d", __func__, port->number);
 749
 750         if (tport == NULL)
 751                 return -ENODEV;
 752
 753         spin_lock_irqsave(&tport->tp_lock, flags);
 754         chars = ti_buf_data_avail(tport->tp_write_buf);
 755         spin_unlock_irqrestore(&tport->tp_lock, flags);
 756
 757         dbg("%s - returns %d", __func__, chars);
 758         return chars;
 759 }
 760
 761
 762 static void ti_throttle(struct tty_struct *tty)
 763 {
 764         struct usb_serial_port *port = tty->driver_data;
 765         struct ti_port *tport = usb_get_serial_port_data(port);
 766
 767         dbg("%s - port %d", __func__, port->number);
 768
 769         if (tport == NULL)
 770                 return;
 771
 772         if (I_IXOFF(tty) || C_CRTSCTS(tty))
 773                 ti_stop_read(tport, tty);
 774
 775 }
 776
 777
 778 static void ti_unthrottle(struct tty_struct *tty)
 779 {
 780         struct usb_serial_port *port = tty->driver_data;
 781         struct ti_port *tport = usb_get_serial_port_data(port);
 782         int status;
 783
 784         dbg("%s - port %d", __func__, port->number);
 785
 786         if (tport == NULL)
 787                 return;
 788
 789         if (I_IXOFF(tty) || C_CRTSCTS(tty)) {
 790                 status = ti_restart_read(tport, tty);
 791                 if (status)
 792                         dev_err(&port->dev, "%s - cannot restart read, %d\n",
 793                                                         __func__, status);
 794         }
 795 }
 796
 797
 798 static int ti_ioctl(struct tty_struct *tty, struct file *file,
 799         unsigned int cmd, unsigned long arg)
 800 {
 801         struct usb_serial_port *port = tty->driver_data;
 802         struct ti_port *tport = usb_get_serial_port_data(port);
 803         struct async_icount cnow;
 804         struct async_icount cprev;
 805
 806         dbg("%s - port %d, cmd = 0x%04X", __func__, port->number, cmd);
 807
 808         if (tport == NULL)
 809                 return -ENODEV;
 810
 811         switch (cmd) {
 812         case TIOCGSERIAL:
 813                 dbg("%s - (%d) TIOCGSERIAL", __func__, port->number);
 814                 return ti_get_serial_info(tport,
 815                                 (struct serial_struct __user *)arg);
 816         case TIOCSSERIAL:
 817                 dbg("%s - (%d) TIOCSSERIAL", __func__, port->number);
 818                 return ti_set_serial_info(tty, tport,
 819                                 (struct serial_struct __user *)arg);
 820         case TIOCMIWAIT:
 821                 dbg("%s - (%d) TIOCMIWAIT", __func__, port->number);
 822                 cprev = tport->tp_icount;
 823                 while (1) {
 824                         interruptible_sleep_on(&tport->tp_msr_wait);
 825                         if (signal_pending(current))
 826                                 return -ERESTARTSYS;
 827                         cnow = tport->tp_icount;
 828                         if (cnow.rng == cprev.rng && cnow.dsr == cprev.dsr &&
 829                             cnow.dcd == cprev.dcd && cnow.cts == cprev.cts)
 830                                 return -EIO; /* no change => error */
 831                         if (((arg & TIOCM_RNG) && (cnow.rng != cprev.rng)) ||
 832                             ((arg & TIOCM_DSR) && (cnow.dsr != cprev.dsr)) ||
 833                             ((arg & TIOCM_CD)  && (cnow.dcd != cprev.dcd)) ||
 834                             ((arg & TIOCM_CTS) && (cnow.cts != cprev.cts)))
 835                                 return 0;
 836                         cprev = cnow;
 837                 }
 838                 break;
 839         case TIOCGICOUNT:
 840                 dbg("%s - (%d) TIOCGICOUNT RX=%d, TX=%d",
 841                                 __func__, port->number,
 842                                 tport->tp_icount.rx, tport->tp_icount.tx);
 843                 if (copy_to_user((void __user *)arg, &tport->tp_icount,
 844                                         sizeof(tport->tp_icount)))
 845                         return -EFAULT;
 846                 return 0;
 847         }
 848         return -ENOIOCTLCMD;
 849 }
 850
 851
 852 static void ti_set_termios(struct tty_struct *tty,
 853                 struct usb_serial_port *port, struct ktermios *old_termios)
 854 {
 855         struct ti_port *tport = usb_get_serial_port_data(port);
 856         struct ti_uart_config *config;
 857         tcflag_t cflag, iflag;
 858         int baud;
 859         int status;
 860         int port_number = port->number - port->serial->minor;
 861         unsigned int mcr;
 862
 863         dbg("%s - port %d", __func__, port->number);
 864
 865         cflag = tty->termios->c_cflag;
 866         iflag = tty->termios->c_iflag;
 867
 868         dbg("%s - cflag %08x, iflag %08x", __func__, cflag, iflag);
 869         dbg("%s - old clfag %08x, old iflag %08x", __func__,
 870                                 old_termios->c_cflag, old_termios->c_iflag);
 871
 872         if (tport == NULL)
 873                 return;
 874
 875         config = kmalloc(sizeof(*config), GFP_KERNEL);
 876         if (!config) {
 877                 dev_err(&port->dev, "%s - out of memory\n", __func__);
 878                 return;
 879         }
 880
 881         config->wFlags = 0;
 882
 883         /* these flags must be set */
 884         config->wFlags |= TI_UART_ENABLE_MS_INTS;
 885         config->wFlags |= TI_UART_ENABLE_AUTO_START_DMA;
 886         config->bUartMode = (__u8)(tport->tp_uart_mode);
 887
 888         switch (cflag & CSIZE) {
 889         case CS5:
 890                     config->bDataBits = TI_UART_5_DATA_BITS;
 891                     break;
 892         case CS6:
 893                     config->bDataBits = TI_UART_6_DATA_BITS;
 894                     break;
 895         case CS7:
 896                     config->bDataBits = TI_UART_7_DATA_BITS;
 897                     break;
 898         default:
 899         case CS8:
 900                     config->bDataBits = TI_UART_8_DATA_BITS;
 901                     break;
 902         }
 903
 904         /* CMSPAR isn't supported by this driver */
 905         tty->termios->c_cflag &= ~CMSPAR;
 906
 907         if (cflag & PARENB) {
 908                 if (cflag & PARODD) {
 909                         config->wFlags |= TI_UART_ENABLE_PARITY_CHECKING;
 910                         config->bParity = TI_UART_ODD_PARITY;
 911                 } else {
 912                         config->wFlags |= TI_UART_ENABLE_PARITY_CHECKING;
 913                         config->bParity = TI_UART_EVEN_PARITY;
 914                 }
 915         } else {
 916                 config->wFlags &= ~TI_UART_ENABLE_PARITY_CHECKING;
 917                 config->bParity = TI_UART_NO_PARITY;
 918         }
 919
 920         if (cflag & CSTOPB)
 921                 config->bStopBits = TI_UART_2_STOP_BITS;
 922         else
 923                 config->bStopBits = TI_UART_1_STOP_BITS;
 924
 925         if (cflag & CRTSCTS) {
 926                 /* RTS flow control must be off to drop RTS for baud rate B0 */
 927                 if ((cflag & CBAUD) != B0)
 928                         config->wFlags |= TI_UART_ENABLE_RTS_IN;
 929                 config->wFlags |= TI_UART_ENABLE_CTS_OUT;
 930         } else {
 931                 tty->hw_stopped = 0;
 932                 ti_restart_read(tport, tty);
 933         }
 934
 935         if (I_IXOFF(tty) || I_IXON(tty)) {
 936                 config->cXon  = START_CHAR(tty);
 937                 config->cXoff = STOP_CHAR(tty);
 938
 939                 if (I_IXOFF(tty))
 940                         config->wFlags |= TI_UART_ENABLE_X_IN;
 941                 else
 942                         ti_restart_read(tport, tty);
 943
 944                 if (I_IXON(tty))
 945                         config->wFlags |= TI_UART_ENABLE_X_OUT;
 946         }
 947
 948         baud = tty_get_baud_rate(tty);
 949         if (!baud)
 950                 baud = 9600;
 951         if (tport->tp_tdev->td_is_3410)
 952                 config->wBaudRate = (__u16)((923077 + baud/2) / baud);
 953         else
 954                 config->wBaudRate = (__u16)((461538 + baud/2) / baud);
 955
 956         /* FIXME: Should calculate resulting baud here and report it back */
 957         if ((cflag & CBAUD) != B0)
 958                 tty_encode_baud_rate(tty, baud, baud);
 959
 960         dbg("%s - BaudRate=%d, wBaudRate=%d, wFlags=0x%04X, bDataBits=%d, bParity=%d, bStopBits=%d, cXon=%d, cXoff=%d, bUartMode=%d",
 961         __func__, baud, config->wBaudRate, config->wFlags, config->bDataBits, config->bParity, config->bStopBits, config->cXon, config->cXoff, config->bUartMode);
 962
 963         cpu_to_be16s(&config->wBaudRate);
 964         cpu_to_be16s(&config->wFlags);
 965
 966         status = ti_command_out_sync(tport->tp_tdev, TI_SET_CONFIG,
 967                 (__u8)(TI_UART1_PORT + port_number), 0, (__u8 *)config,
 968                 sizeof(*config));
 969         if (status)
 970                 dev_err(&port->dev, "%s - cannot set config on port %d, %d\n",
 971                                         __func__, port_number, status);
 972
 973         /* SET_CONFIG asserts RTS and DTR, reset them correctly */
 974         mcr = tport->tp_shadow_mcr;
 975         /* if baud rate is B0, clear RTS and DTR */
 976         if ((cflag & CBAUD) == B0)
 977                 mcr &= ~(TI_MCR_DTR | TI_MCR_RTS);
 978         status = ti_set_mcr(tport, mcr);
 979         if (status)
 980                 dev_err(&port->dev,
 981                         "%s - cannot set modem control on port %d, %d\n",
 982                                                 __func__, port_number, status);
 983
 984         kfree(config);
 985 }
 986
 987
 988 static int ti_tiocmget(struct tty_struct *tty, struct file *file)
 989 {
 990         struct usb_serial_port *port = tty->driver_data;
 991         struct ti_port *tport = usb_get_serial_port_data(port);
 992         unsigned int result;
 993         unsigned int msr;
 994         unsigned int mcr;
 995         unsigned long flags;
 996
 997         dbg("%s - port %d", __func__, port->number);
 998
 999         if (tport == NULL)
1000                 return -ENODEV;
1001
1002         spin_lock_irqsave(&tport->tp_lock, flags);
1003         msr = tport->tp_msr;
1004         mcr = tport->tp_shadow_mcr;
1005         spin_unlock_irqrestore(&tport->tp_lock, flags);
1006
1007         result = ((mcr & TI_MCR_DTR) ? TIOCM_DTR : 0)
1008                 | ((mcr & TI_MCR_RTS) ? TIOCM_RTS : 0)
1009                 | ((mcr & TI_MCR_LOOP) ? TIOCM_LOOP : 0)
1010                 | ((msr & TI_MSR_CTS) ? TIOCM_CTS : 0)
1011                 | ((msr & TI_MSR_CD) ? TIOCM_CAR : 0)
1012                 | ((msr & TI_MSR_RI) ? TIOCM_RI : 0)
1013                 | ((msr & TI_MSR_DSR) ? TIOCM_DSR : 0);
1014
1015         dbg("%s - 0x%04X", __func__, result);
1016
1017         return result;
1018 }
1019
1020
1021 static int ti_tiocmset(struct tty_struct *tty, struct file *file,
1022         unsigned int set, unsigned int clear)
1023 {
1024         struct usb_serial_port *port = tty->driver_data;
1025         struct ti_port *tport = usb_get_serial_port_data(port);
1026         unsigned int mcr;
1027         unsigned long flags;
1028
1029         dbg("%s - port %d", __func__, port->number);
1030
1031         if (tport == NULL)
1032                 return -ENODEV;
1033
1034         spin_lock_irqsave(&tport->tp_lock, flags);
1035         mcr = tport->tp_shadow_mcr;
1036
1037         if (set & TIOCM_RTS)
1038                 mcr |= TI_MCR_RTS;
1039         if (set & TIOCM_DTR)
1040                 mcr |= TI_MCR_DTR;
1041         if (set & TIOCM_LOOP)
1042                 mcr |= TI_MCR_LOOP;
1043
1044         if (clear & TIOCM_RTS)
1045                 mcr &= ~TI_MCR_RTS;
1046         if (clear & TIOCM_DTR)
1047                 mcr &= ~TI_MCR_DTR;
1048         if (clear & TIOCM_LOOP)
1049                 mcr &= ~TI_MCR_LOOP;
1050         spin_unlock_irqrestore(&tport->tp_lock, flags);
1051
1052         return ti_set_mcr(tport, mcr);
1053 }
1054
1055
1056 static void ti_break(struct tty_struct *tty, int break_state)
1057 {
1058         struct usb_serial_port *port = tty->driver_data;
1059         struct ti_port *tport = usb_get_serial_port_data(port);
1060         int status;
1061
1062         dbg("%s - state = %d", __func__, break_state);
1063
1064         if (tport == NULL)
1065                 return;
1066
1067         ti_drain(tport, (tport->tp_closing_wait*HZ)/100, 0);
1068
1069         status = ti_write_byte(tport->tp_tdev,
1070                 tport->tp_uart_base_addr + TI_UART_OFFSET_LCR,
1071                 TI_LCR_BREAK, break_state == -1 ? TI_LCR_BREAK : 0);
1072
1073         if (status)
1074                 dbg("%s - error setting break, %d", __func__, status);
1075 }
1076
1077
1078 static void ti_interrupt_callback(struct urb *urb)
1079 {
1080         struct ti_device *tdev = urb->context;
1081         struct usb_serial_port *port;
1082         struct usb_serial *serial = tdev->td_serial;
1083         struct ti_port *tport;
1084         struct device *dev = &urb->dev->dev;
1085         unsigned char *data = urb->transfer_buffer;
1086         int length = urb->actual_length;
1087         int port_number;
1088         int function;
1089         int status = urb->status;
1090         int retval;
1091         __u8 msr;
1092
1093         dbg("%s", __func__);
1094
1095         switch (status) {
1096         case 0:
1097                 break;
1098         case -ECONNRESET:
1099         case -ENOENT:
1100         case -ESHUTDOWN:
1101                 dbg("%s - urb shutting down, %d", __func__, status);
1102                 tdev->td_urb_error = 1;
1103                 return;
1104         default:
1105                 dev_err(dev, "%s - nonzero urb status, %d\n",
1106                         __func__, status);
1107                 tdev->td_urb_error = 1;
1108                 goto exit;
1109         }
1110
1111         if (length != 2) {
1112                 dbg("%s - bad packet size, %d", __func__, length);
1113                 goto exit;
1114         }
1115
1116         if (data[0] == TI_CODE_HARDWARE_ERROR) {
1117                 dev_err(dev, "%s - hardware error, %d\n", __func__, data[1]);
1118                 goto exit;
1119         }
1120
1121         port_number = TI_GET_PORT_FROM_CODE(data[0]);
1122         function = TI_GET_FUNC_FROM_CODE(data[0]);
1123
1124         dbg("%s - port_number %d, function %d, data 0x%02X",
1125                                 __func__, port_number, function, data[1]);
1126
1127         if (port_number >= serial->num_ports) {
1128                 dev_err(dev, "%s - bad port number, %d\n",
1129                                                 __func__, port_number);
1130                 goto exit;
1131         }
1132
1133         port = serial->port[port_number];
1134
1135         tport = usb_get_serial_port_data(port);
1136         if (!tport)
1137                 goto exit;
1138
1139         switch (function) {
1140         case TI_CODE_DATA_ERROR:
1141                 dev_err(dev, "%s - DATA ERROR, port %d, data 0x%02X\n",
1142                                         __func__, port_number, data[1]);
1143                 break;
1144
1145         case TI_CODE_MODEM_STATUS:
1146                 msr = data[1];
1147                 dbg("%s - port %d, msr 0x%02X", __func__, port_number, msr);
1148                 ti_handle_new_msr(tport, msr);
1149                 break;
1150
1151         default:
1152                 dev_err(dev, "%s - unknown interrupt code, 0x%02X\n",
1153                                                         __func__, data[1]);
1154                 break;
1155         }
1156
1157 exit:
1158         retval = usb_submit_urb(urb, GFP_ATOMIC);
1159         if (retval)
1160                 dev_err(dev, "%s - resubmit interrupt urb failed, %d\n",
1161                         __func__, retval);
1162 }
1163
1164
1165 static void ti_bulk_in_callback(struct urb *urb)
1166 {
1167         struct ti_port *tport = urb->context;
1168         struct usb_serial_port *port = tport->tp_port;
1169         struct device *dev = &urb->dev->dev;
1170         int status = urb->status;
1171         int retval = 0;
1172         struct tty_struct *tty;
1173
1174         dbg("%s", __func__);
1175
1176         switch (status) {
1177         case 0:
1178                 break;
1179         case -ECONNRESET:
1180         case -ENOENT:
1181         case -ESHUTDOWN:
1182                 dbg("%s - urb shutting down, %d", __func__, status);
1183                 tport->tp_tdev->td_urb_error = 1;
1184                 wake_up_interruptible(&tport->tp_write_wait);
1185                 return;
1186         default:
1187                 dev_err(dev, "%s - nonzero urb status, %d\n",
1188                         __func__, status);
1189                 tport->tp_tdev->td_urb_error = 1;
1190                 wake_up_interruptible(&tport->tp_write_wait);
1191         }
1192
1193         if (status == -EPIPE)
1194                 goto exit;
1195
1196         if (status) {
1197                 dev_err(dev, "%s - stopping read!\n", __func__);
1198                 return;
1199         }
1200
1201         tty = tty_port_tty_get(&port->port);
1202         if (tty && urb->actual_length) {
1203                 usb_serial_debug_data(debug, dev, __func__,
1204                         urb->actual_length, urb->transfer_buffer);
1205
1206                 if (!tport->tp_is_open)
1207                         dbg("%s - port closed, dropping data", __func__);
1208                 else
1209                         ti_recv(&urb->dev->dev, tty,
1210                                                 urb->transfer_buffer,
1211                                                 urb->actual_length);
1212
1213                 spin_lock(&tport->tp_lock);
1214                 tport->tp_icount.rx += urb->actual_length;
1215                 spin_unlock(&tport->tp_lock);
1216                 tty_kref_put(tty);
1217         }
1218
1219 exit:
1220         /* continue to read unless stopping */
1221         spin_lock(&tport->tp_lock);
1222         if (tport->tp_read_urb_state == TI_READ_URB_RUNNING) {
1223                 urb->dev = port->serial->dev;
1224                 retval = usb_submit_urb(urb, GFP_ATOMIC);
1225         } else if (tport->tp_read_urb_state == TI_READ_URB_STOPPING) {
1226                 tport->tp_read_urb_state = TI_READ_URB_STOPPED;
1227         }
1228         spin_unlock(&tport->tp_lock);
1229         if (retval)
1230                 dev_err(dev, "%s - resubmit read urb failed, %d\n",
1231                         __func__, retval);
1232 }
1233
1234
1235 static void ti_bulk_out_callback(struct urb *urb)
1236 {
1237         struct ti_port *tport = urb->context;
1238         struct usb_serial_port *port = tport->tp_port;
1239         struct device *dev = &urb->dev->dev;
1240         int status = urb->status;
1241
1242         dbg("%s - port %d", __func__, port->number);
1243
1244         tport->tp_write_urb_in_use = 0;
1245
1246         switch (status) {
1247         case 0:
1248                 break;
1249         case -ECONNRESET:
1250         case -ENOENT:
1251         case -ESHUTDOWN:
1252                 dbg("%s - urb shutting down, %d", __func__, status);
1253                 tport->tp_tdev->td_urb_error = 1;
1254                 wake_up_interruptible(&tport->tp_write_wait);
1255                 return;
1256         default:
1257                 dev_err(dev, "%s - nonzero urb status, %d\n",
1258                         __func__, status);
1259                 tport->tp_tdev->td_urb_error = 1;
1260                 wake_up_interruptible(&tport->tp_write_wait);
1261         }
1262
1263         /* send any buffered data */
1264         ti_send(tport);
1265 }
1266
1267
1268 static void ti_recv(struct device *dev, struct tty_struct *tty,
1269         unsigned char *data, int length)
1270 {
1271         int cnt;
1272
1273         do {
1274                 cnt = tty_buffer_request_room(tty, length);
1275                 if (cnt < length) {
1276                         dev_err(dev, "%s - dropping data, %d bytes lost\n",
1277                                                 __func__, length - cnt);
1278                         if (cnt == 0)
1279                                 break;
1280                 }
1281                 tty_insert_flip_string(tty, data, cnt);
1282                 tty_flip_buffer_push(tty);
1283                 data += cnt;
1284                 length -= cnt;
1285         } while (length > 0);
1286
1287 }
1288
1289
1290 static void ti_send(struct ti_port *tport)
1291 {
1292         int count, result;
1293         struct usb_serial_port *port = tport->tp_port;
1294         struct tty_struct *tty = tty_port_tty_get(&port->port); /* FIXME */
1295         unsigned long flags;
1296
1297
1298         dbg("%s - port %d", __func__, port->number);
1299
1300         spin_lock_irqsave(&tport->tp_lock, flags);
1301
1302         if (tport->tp_write_urb_in_use)
1303                 goto unlock;
1304
1305         count = ti_buf_get(tport->tp_write_buf,
1306                                 port->write_urb->transfer_buffer,
1307                                 port->bulk_out_size);
1308
1309         if (count == 0)
1310                 goto unlock;
1311
1312         tport->tp_write_urb_in_use = 1;
1313
1314         spin_unlock_irqrestore(&tport->tp_lock, flags);
1315
1316         usb_serial_debug_data(debug, &port->dev, __func__, count,
1317                                         port->write_urb->transfer_buffer);
1318
1319         usb_fill_bulk_urb(port->write_urb, port->serial->dev,
1320                            usb_sndbulkpipe(port->serial->dev,
1321                                             port->bulk_out_endpointAddress),
1322                            port->write_urb->transfer_buffer, count,
1323                            ti_bulk_out_callback, tport);
1324
1325         result = usb_submit_urb(port->write_urb, GFP_ATOMIC);
1326         if (result) {
1327                 dev_err(&port->dev, "%s - submit write urb failed, %d\n",
1328                                                         __func__, result);
1329                 tport->tp_write_urb_in_use = 0;
1330                 /* TODO: reschedule ti_send */
1331         } else {
1332                 spin_lock_irqsave(&tport->tp_lock, flags);
1333                 tport->tp_icount.tx += count;
1334                 spin_unlock_irqrestore(&tport->tp_lock, flags);
1335         }
1336
1337         /* more room in the buffer for new writes, wakeup */
1338         if (tty)
1339                 tty_wakeup(tty);
1340         tty_kref_put(tty);
1341         wake_up_interruptible(&tport->tp_write_wait);
1342         return;
1343 unlock:
1344         spin_unlock_irqrestore(&tport->tp_lock, flags);
1345         tty_kref_put(tty);
1346         return;
1347 }
1348
1349
1350 static int ti_set_mcr(struct ti_port *tport, unsigned int mcr)
1351 {
1352         unsigned long flags;
1353         int status;
1354
1355         status = ti_write_byte(tport->tp_tdev,
1356                 tport->tp_uart_base_addr + TI_UART_OFFSET_MCR,
1357                 TI_MCR_RTS | TI_MCR_DTR | TI_MCR_LOOP, mcr);
1358
1359         spin_lock_irqsave(&tport->tp_lock, flags);
1360         if (!status)
1361                 tport->tp_shadow_mcr = mcr;
1362         spin_unlock_irqrestore(&tport->tp_lock, flags);
1363
1364         return status;
1365 }
1366
1367
1368 static int ti_get_lsr(struct ti_port *tport)
1369 {
1370         int size, status;
1371         struct ti_device *tdev = tport->tp_tdev;
1372         struct usb_serial_port *port = tport->tp_port;
1373         int port_number = port->number - port->serial->minor;
1374         struct ti_port_status *data;
1375
1376         dbg("%s - port %d", __func__, port->number);
1377
1378         size = sizeof(struct ti_port_status);
1379         data = kmalloc(size, GFP_KERNEL);
1380         if (!data) {
1381                 dev_err(&port->dev, "%s - out of memory\n", __func__);
1382                 return -ENOMEM;
1383         }
1384
1385         status = ti_command_in_sync(tdev, TI_GET_PORT_STATUS,
1386                 (__u8)(TI_UART1_PORT+port_number), 0, (__u8 *)data, size);
1387         if (status) {
1388                 dev_err(&port->dev,
1389                         "%s - get port status command failed, %d\n",
1390                                                         __func__, status);
1391                 goto free_data;
1392         }
1393
1394         dbg("%s - lsr 0x%02X", __func__, data->bLSR);
1395
1396         tport->tp_lsr = data->bLSR;
1397
1398 free_data:
1399         kfree(data);
1400         return status;
1401 }
1402
1403
1404 static int ti_get_serial_info(struct ti_port *tport,
1405         struct serial_struct __user *ret_arg)
1406 {
1407         struct usb_serial_port *port = tport->tp_port;
1408         struct serial_struct ret_serial;
1409
1410         if (!ret_arg)
1411                 return -EFAULT;
1412
1413         memset(&ret_serial, 0, sizeof(ret_serial));
1414
1415         ret_serial.type = PORT_16550A;
1416         ret_serial.line = port->serial->minor;
1417         ret_serial.port = port->number - port->serial->minor;
1418         ret_serial.flags = tport->tp_flags;
1419         ret_serial.xmit_fifo_size = TI_WRITE_BUF_SIZE;
1420         ret_serial.baud_base = tport->tp_tdev->td_is_3410 ? 921600 : 460800;
1421         ret_serial.closing_wait = tport->tp_closing_wait;
1422
1423         if (copy_to_user(ret_arg, &ret_serial, sizeof(*ret_arg)))
1424                 return -EFAULT;
1425
1426         return 0;
1427 }
1428
1429
1430 static int ti_set_serial_info(struct tty_struct *tty, struct ti_port *tport,
1431         struct serial_struct __user *new_arg)
1432 {
1433         struct serial_struct new_serial;
1434
1435         if (copy_from_user(&new_serial, new_arg, sizeof(new_serial)))
1436                 return -EFAULT;
1437
1438         tport->tp_flags = new_serial.flags & TI_SET_SERIAL_FLAGS;
1439         tty->low_latency = (tport->tp_flags & ASYNC_LOW_LATENCY) ? 1 : 0;
1440         tport->tp_closing_wait = new_serial.closing_wait;
1441
1442         return 0;
1443 }
1444
1445
1446 static void ti_handle_new_msr(struct ti_port *tport, __u8 msr)
1447 {
1448         struct async_icount *icount;
1449         struct tty_struct *tty;
1450         unsigned long flags;
1451
1452         dbg("%s - msr 0x%02X", __func__, msr);
1453
1454         if (msr & TI_MSR_DELTA_MASK) {
1455                 spin_lock_irqsave(&tport->tp_lock, flags);
1456                 icount = &tport->tp_icount;
1457                 if (msr & TI_MSR_DELTA_CTS)
1458                         icount->cts++;
1459                 if (msr & TI_MSR_DELTA_DSR)
1460                         icount->dsr++;
1461                 if (msr & TI_MSR_DELTA_CD)
1462                         icount->dcd++;
1463                 if (msr & TI_MSR_DELTA_RI)
1464                         icount->rng++;
1465                 wake_up_interruptible(&tport->tp_msr_wait);
1466                 spin_unlock_irqrestore(&tport->tp_lock, flags);
1467         }
1468
1469         tport->tp_msr = msr & TI_MSR_MASK;
1470
1471         /* handle CTS flow control */
1472         tty = tty_port_tty_get(&tport->tp_port->port);
1473         if (tty && C_CRTSCTS(tty)) {
1474                 if (msr & TI_MSR_CTS) {
1475                         tty->hw_stopped = 0;
1476                         tty_wakeup(tty);
1477                 } else {
1478                         tty->hw_stopped = 1;
1479                 }
1480         }
1481         tty_kref_put(tty);
1482 }
1483
1484
1485 static void ti_drain(struct ti_port *tport, unsigned long timeout, int flush)
1486 {
1487         struct ti_device *tdev = tport->tp_tdev;
1488         struct usb_serial_port *port = tport->tp_port;
1489         wait_queue_t wait;
1490
1491         dbg("%s - port %d", __func__, port->number);
1492
1493         spin_lock_irq(&tport->tp_lock);
1494
1495         /* wait for data to drain from the buffer */
1496         tdev->td_urb_error = 0;
1497         init_waitqueue_entry(&wait, current);
1498         add_wait_queue(&tport->tp_write_wait, &wait);
1499         for (;;) {
1500                 set_current_state(TASK_INTERRUPTIBLE);
1501                 if (ti_buf_data_avail(tport->tp_write_buf) == 0
1502                 || timeout == 0 || signal_pending(current)
1503                 || tdev->td_urb_error
1504                 || port->serial->disconnected)  /* disconnect */
1505                         break;
1506                 spin_unlock_irq(&tport->tp_lock);
1507                 timeout = schedule_timeout(timeout);
1508                 spin_lock_irq(&tport->tp_lock);
1509         }
1510         set_current_state(TASK_RUNNING);
1511         remove_wait_queue(&tport->tp_write_wait, &wait);
1512
1513         /* flush any remaining data in the buffer */
1514         if (flush)
1515                 ti_buf_clear(tport->tp_write_buf);
1516
1517         spin_unlock_irq(&tport->tp_lock);
1518
1519         mutex_lock(&port->serial->disc_mutex);
1520         /* wait for data to drain from the device */
1521         /* wait for empty tx register, plus 20 ms */
1522         timeout += jiffies;
1523         tport->tp_lsr &= ~TI_LSR_TX_EMPTY;
1524         while ((long)(jiffies - timeout) < 0 && !signal_pending(current)
1525         && !(tport->tp_lsr&TI_LSR_TX_EMPTY) && !tdev->td_urb_error
1526         && !port->serial->disconnected) {
1527                 if (ti_get_lsr(tport))
1528                         break;
1529                 mutex_unlock(&port->serial->disc_mutex);
1530                 msleep_interruptible(20);
1531                 mutex_lock(&port->serial->disc_mutex);
1532         }
1533         mutex_unlock(&port->serial->disc_mutex);
1534 }
1535
1536
1537 static void ti_stop_read(struct ti_port *tport, struct tty_struct *tty)
1538 {
1539         unsigned long flags;
1540
1541         spin_lock_irqsave(&tport->tp_lock, flags);
1542
1543         if (tport->tp_read_urb_state == TI_READ_URB_RUNNING)
1544                 tport->tp_read_urb_state = TI_READ_URB_STOPPING;
1545
1546         spin_unlock_irqrestore(&tport->tp_lock, flags);
1547 }
1548
1549
1550 static int ti_restart_read(struct ti_port *tport, struct tty_struct *tty)
1551 {
1552         struct urb *urb;
1553         int status = 0;
1554         unsigned long flags;
1555
1556         spin_lock_irqsave(&tport->tp_lock, flags);
1557
1558         if (tport->tp_read_urb_state == TI_READ_URB_STOPPED) {
1559                 tport->tp_read_urb_state = TI_READ_URB_RUNNING;
1560                 urb = tport->tp_port->read_urb;
1561                 spin_unlock_irqrestore(&tport->tp_lock, flags);
1562                 urb->complete = ti_bulk_in_callback;
1563                 urb->context = tport;
1564                 urb->dev = tport->tp_port->serial->dev;
1565                 status = usb_submit_urb(urb, GFP_KERNEL);
1566         } else  {
1567                 tport->tp_read_urb_state = TI_READ_URB_RUNNING;
1568                 spin_unlock_irqrestore(&tport->tp_lock, flags);
1569         }
1570
1571         return status;
1572 }
1573
1574
1575 static int ti_command_out_sync(struct ti_device *tdev, __u8 command,
1576         __u16 moduleid, __u16 value, __u8 *data, int size)
1577 {
1578         int status;
1579
1580         status = usb_control_msg(tdev->td_serial->dev,
1581                 usb_sndctrlpipe(tdev->td_serial->dev, 0), command,
1582                 (USB_TYPE_VENDOR | USB_RECIP_DEVICE | USB_DIR_OUT),
1583                 value, moduleid, data, size, 1000);
1584
1585         if (status == size)
1586                 status = 0;
1587
1588         if (status > 0)
1589                 status = -ECOMM;
1590
1591         return status;
1592 }
1593
1594
1595 static int ti_command_in_sync(struct ti_device *tdev, __u8 command,
1596         __u16 moduleid, __u16 value, __u8 *data, int size)
1597 {
1598         int status;
1599
1600         status = usb_control_msg(tdev->td_serial->dev,
1601                 usb_rcvctrlpipe(tdev->td_serial->dev, 0), command,
1602                 (USB_TYPE_VENDOR | USB_RECIP_DEVICE | USB_DIR_IN),
1603                 value, moduleid, data, size, 1000);
1604
1605         if (status == size)
1606                 status = 0;
1607
1608         if (status > 0)
1609                 status = -ECOMM;
1610
1611         return status;
1612 }
1613
1614
1615 static int ti_write_byte(struct ti_device *tdev, unsigned long addr,
1616         __u8 mask, __u8 byte)
1617 {
1618         int status;
1619         unsigned int size;
1620         struct ti_write_data_bytes *data;
1621         struct device *dev = &tdev->td_serial->dev->dev;
1622
1623         dbg("%s - addr 0x%08lX, mask 0x%02X, byte 0x%02X",
1624                                         __func__, addr, mask, byte);
1625
1626         size = sizeof(struct ti_write_data_bytes) + 2;
1627         data = kmalloc(size, GFP_KERNEL);
1628         if (!data) {
1629                 dev_err(dev, "%s - out of memory\n", __func__);
1630                 return -ENOMEM;
1631         }
1632
1633         data->bAddrType = TI_RW_DATA_ADDR_XDATA;
1634         data->bDataType = TI_RW_DATA_BYTE;
1635         data->bDataCounter = 1;
1636         data->wBaseAddrHi = cpu_to_be16(addr>>16);
1637         data->wBaseAddrLo = cpu_to_be16(addr);
1638         data->bData[0] = mask;
1639         data->bData[1] = byte;
1640
1641         status = ti_command_out_sync(tdev, TI_WRITE_DATA, TI_RAM_PORT, 0,
1642                 (__u8 *)data, size);
1643
1644         if (status < 0)
1645                 dev_err(dev, "%s - failed, %d\n", __func__, status);
1646
1647         kfree(data);
1648
1649         return status;
1650 }
1651
1652 static int ti_do_download(struct usb_device *dev, int pipe,
1653                                                 u8 *buffer, int size)
1654 {
1655         int pos;
1656         u8 cs = 0;
1657         int done;
1658         struct ti_firmware_header *header;
1659         int status;
1660         int len;
1661
1662         for (pos = sizeof(struct ti_firmware_header); pos < size; pos++)
1663                 cs = (__u8)(cs + buffer[pos]);
1664
1665         header = (struct ti_firmware_header *)buffer;
1666         header->wLength = cpu_to_le16((__u16)(size
1667                                         - sizeof(struct ti_firmware_header)));
1668         header->bCheckSum = cs;
1669
1670         dbg("%s - downloading firmware", __func__);
1671         for (pos = 0; pos < size; pos += done) {
1672                 len = min(size - pos, TI_DOWNLOAD_MAX_PACKET_SIZE);
1673                 status = usb_bulk_msg(dev, pipe, buffer + pos, len,
1674                                                                 &done, 1000);
1675                 if (status)
1676                         break;
1677         }
1678         return status;
1679 }
1680
1681 static int ti_download_firmware(struct ti_device *tdev, int type)
1682 {
1683         int status = -ENOMEM;
1684         int buffer_size;
1685         __u8 *buffer;
1686         struct usb_device *dev = tdev->td_serial->dev;
1687         unsigned int pipe = usb_sndbulkpipe(dev,
1688                 tdev->td_serial->port[0]->bulk_out_endpointAddress);
1689         const struct firmware *fw_p;
1690         char buf[32];
1691         sprintf(buf, "ti_usb-%d.bin", type);
1692
1693         if (request_firmware(&fw_p, buf, &dev->dev)) {
1694                 dev_err(&dev->dev, "%s - firmware not found\n", __func__);
1695                 return -ENOENT;
1696         }
1697         if (fw_p->size > TI_FIRMWARE_BUF_SIZE) {
1698                 dev_err(&dev->dev, "%s - firmware too large\n", __func__);
1699                 return -ENOENT;
1700         }
1701
1702         buffer_size = TI_FIRMWARE_BUF_SIZE + sizeof(struct ti_firmware_header);
1703         buffer = kmalloc(buffer_size, GFP_KERNEL);
1704         if (buffer) {
1705                 memcpy(buffer, fw_p->data, fw_p->size);
1706                 memset(buffer + fw_p->size, 0xff, buffer_size - fw_p->size);
1707                 status = ti_do_download(dev, pipe, buffer, fw_p->size);
1708                 kfree(buffer);
1709         }
1710         release_firmware(fw_p);
1711         if (status) {
1712                 dev_err(&dev->dev, "%s - error downloading firmware, %d\n",
1713                                                         __func__, status);
1714                 return status;
1715         }
1716
1717         dbg("%s - download successful", __func__);
1718
1719         return 0;
1720 }
1721
1722
1723 /* Circular Buffer Functions */
1724
1725 /*
1726  * ti_buf_alloc
1727  *
1728  * Allocate a circular buffer and all associated memory.
1729  */
1730
1731 static struct circ_buf *ti_buf_alloc(void)
1732 {
1733         struct circ_buf *cb;
1734
1735         cb = kmalloc(sizeof(struct circ_buf), GFP_KERNEL);
1736         if (cb == NULL)
1737                 return NULL;
1738
1739         cb->buf = kmalloc(TI_WRITE_BUF_SIZE, GFP_KERNEL);
1740         if (cb->buf == NULL) {
1741                 kfree(cb);
1742                 return NULL;
1743         }
1744
1745         ti_buf_clear(cb);
1746
1747         return cb;
1748 }
1749
1750
1751 /*
1752  * ti_buf_free
1753  *
1754  * Free the buffer and all associated memory.
1755  */
1756
1757 static void ti_buf_free(struct circ_buf *cb)
1758 {
1759         kfree(cb->buf);
1760         kfree(cb);
1761 }
1762
1763
1764 /*
1765  * ti_buf_clear
1766  *
1767  * Clear out all data in the circular buffer.
1768  */
1769
1770 static void ti_buf_clear(struct circ_buf *cb)
1771 {
1772         cb->head = cb->tail = 0;
1773 }
1774
1775
1776 /*
1777  * ti_buf_data_avail
1778  *
1779  * Return the number of bytes of data available in the circular
1780  * buffer.
1781  */
1782
1783 static int ti_buf_data_avail(struct circ_buf *cb)
1784 {
1785         return CIRC_CNT(cb->head, cb->tail, TI_WRITE_BUF_SIZE);
1786 }
1787
1788
1789 /*
1790  * ti_buf_space_avail
1791  *
1792  * Return the number of bytes of space available in the circular
1793  * buffer.
1794  */
1795
1796 static int ti_buf_space_avail(struct circ_buf *cb)
1797 {
1798         return CIRC_SPACE(cb->head, cb->tail, TI_WRITE_BUF_SIZE);
1799 }
1800
1801
1802 /*
1803  * ti_buf_put
1804  *
1805  * Copy data data from a user buffer and put it into the circular buffer.
1806  * Restrict to the amount of space available.
1807  *
1808  * Return the number of bytes copied.
1809  */
1810
1811 static int ti_buf_put(struct circ_buf *cb, const char *buf, int count)
1812 {
1813         int c, ret = 0;
1814
1815         while (1) {
1816                 c = CIRC_SPACE_TO_END(cb->head, cb->tail, TI_WRITE_BUF_SIZE);
1817                 if (count < c)
1818                         c = count;
1819                 if (c <= 0)
1820                         break;
1821                 memcpy(cb->buf + cb->head, buf, c);
1822                 cb->head = (cb->head + c) & (TI_WRITE_BUF_SIZE-1);
1823                 buf += c;
1824                 count -= c;
1825                 ret += c;
1826         }
1827
1828         return ret;
1829 }
1830
1831
1832 /*
1833  * ti_buf_get
1834  *
1835  * Get data from the circular buffer and copy to the given buffer.
1836  * Restrict to the amount of data available.
1837  *
1838  * Return the number of bytes copied.
1839  */
1840
1841 static int ti_buf_get(struct circ_buf *cb, char *buf, int count)
1842 {
1843         int c, ret = 0;
1844
1845         while (1) {
1846                 c = CIRC_CNT_TO_END(cb->head, cb->tail, TI_WRITE_BUF_SIZE);
1847                 if (count < c)
1848                         c = count;
1849                 if (c <= 0)
1850                         break;
1851                 memcpy(buf, cb->buf + cb->tail, c);
1852                 cb->tail = (cb->tail + c) & (TI_WRITE_BUF_SIZE-1);
1853                 buf += c;
1854                 count -= c;
1855                 ret += c;
1856         }
1857
1858         return ret;
1859 }