drivers/usb/serial/ark3116.c

   1 /*
   2  * Copyright (C) 2006
   3  *   Simon Schulz (ark3116_driver <at> auctionant.de)
   4  *
   5  * ark3116
   6  * - implements a driver for the arkmicro ark3116 chipset (vendor=0x6547,
   7  *   productid=0x0232) (used in a datacable called KQ-U8A)
   8  *
   9  * - based on code by krisfx -> thanks !!
  10  *   (see http://www.linuxquestions.org/questions/showthread.php?p=2184457#post2184457)
  11  *
  12  *  - based on logs created by usbsnoopy
  13  *
  14  * This program is free software; you can redistribute it and/or modify it
  15  * under the terms of the GNU General Public License as published by the
  16  * Free Software Foundation; either version 2 of the License, or (at your
  17  * option) any later version.
  18  */
  19
  20 #include <linux/kernel.h>
  21 #include <linux/init.h>
  22 #include <linux/tty.h>
  23 #include <linux/module.h>
  24 #include <linux/usb.h>
  25 #include <linux/usb/serial.h>
  26 #include <linux/serial.h>
  27 #include <asm/uaccess.h>
  28
  29
  30 static int debug;
  31
  32 static struct usb_device_id id_table [] = {
  33         { USB_DEVICE(0x6547, 0x0232) },
  34         { },
  35 };
  36 MODULE_DEVICE_TABLE(usb, id_table);
  37
  38 struct ark3116_private {
  39         spinlock_t lock;
  40         u8 termios_initialized;
  41 };
  42
  43 static inline void ARK3116_SND(struct usb_serial *serial, int seq,
  44                                __u8 request, __u8 requesttype,
  45                                __u16 value, __u16 index)
  46 {
  47         int result;
  48         result = usb_control_msg(serial->dev,
  49                                  usb_sndctrlpipe(serial->dev, 0),
  50                                  request, requesttype, value, index,
  51                                  NULL, 0x00, 1000);
  52         dbg("%03d > ok", seq);
  53 }
  54
  55 static inline void ARK3116_RCV(struct usb_serial *serial, int seq,
  56                                __u8 request, __u8 requesttype,
  57                                __u16 value, __u16 index, __u8 expected,
  58                                char *buf)
  59 {
  60         int result;
  61         result = usb_control_msg(serial->dev,
  62                                  usb_rcvctrlpipe(serial->dev, 0),
  63                                  request, requesttype, value, index,
  64                                  buf, 0x0000001, 1000);
  65         if (result)
  66                 dbg("%03d < %d bytes [0x%02X]", seq, result, buf[0]);
  67         else
  68                 dbg("%03d < 0 bytes", seq);
  69 }
  70
  71 static inline void ARK3116_RCV_QUIET(struct usb_serial *serial,
  72                                      __u8 request, __u8 requesttype,
  73                                      __u16 value, __u16 index, char *buf)
  74 {
  75         usb_control_msg(serial->dev,
  76                         usb_rcvctrlpipe(serial->dev, 0),
  77                         request, requesttype, value, index,
  78                         buf, 0x0000001, 1000);
  79 }
  80
  81 static int ark3116_attach(struct usb_serial *serial)
  82 {
  83         char *buf;
  84         struct ark3116_private *priv;
  85         int i;
  86
  87         for (i = 0; i < serial->num_ports; ++i) {
  88                 priv = kzalloc(sizeof(struct ark3116_private), GFP_KERNEL);
  89                 if (!priv)
  90                         goto cleanup;
  91                 spin_lock_init(&priv->lock);
  92
  93                 usb_set_serial_port_data(serial->port[i], priv);
  94         }
  95
  96         buf = kmalloc(1, GFP_KERNEL);
  97         if (!buf) {
  98                 dbg("error kmalloc -> out of mem?");
  99                 goto cleanup;
 100         }
 101
 102         /* 3 */
 103         ARK3116_SND(serial, 3, 0xFE, 0x40, 0x0008, 0x0002);
 104         ARK3116_SND(serial, 4, 0xFE, 0x40, 0x0008, 0x0001);
 105         ARK3116_SND(serial, 5, 0xFE, 0x40, 0x0000, 0x0008);
 106         ARK3116_SND(serial, 6, 0xFE, 0x40, 0x0000, 0x000B);
 107
 108         /* <-- seq7 */
 109         ARK3116_RCV(serial,  7, 0xFE, 0xC0, 0x0000, 0x0003, 0x00, buf);
 110         ARK3116_SND(serial,  8, 0xFE, 0x40, 0x0080, 0x0003);
 111         ARK3116_SND(serial,  9, 0xFE, 0x40, 0x001A, 0x0000);
 112         ARK3116_SND(serial, 10, 0xFE, 0x40, 0x0000, 0x0001);
 113         ARK3116_SND(serial, 11, 0xFE, 0x40, 0x0000, 0x0003);
 114
 115         /* <-- seq12 */
 116         ARK3116_RCV(serial, 12, 0xFE, 0xC0, 0x0000, 0x0004, 0x00, buf);
 117         ARK3116_SND(serial, 13, 0xFE, 0x40, 0x0000, 0x0004);
 118
 119         /* 14 */
 120         ARK3116_RCV(serial, 14, 0xFE, 0xC0, 0x0000, 0x0004, 0x00, buf);
 121         ARK3116_SND(serial, 15, 0xFE, 0x40, 0x0000, 0x0004);
 122
 123         /* 16 */
 124         ARK3116_RCV(serial, 16, 0xFE, 0xC0, 0x0000, 0x0004, 0x00, buf);
 125         /* --> seq17 */
 126         ARK3116_SND(serial, 17, 0xFE, 0x40, 0x0001, 0x0004);
 127
 128         /* <-- seq18 */
 129         ARK3116_RCV(serial, 18, 0xFE, 0xC0, 0x0000, 0x0004, 0x01, buf);
 130
 131         /* --> seq19 */
 132         ARK3116_SND(serial, 19, 0xFE, 0x40, 0x0003, 0x0004);
 133
 134         /* <-- seq20 */
 135         /* seems like serial port status info (RTS, CTS, ...) */
 136         /* returns modem control line status?! */
 137         ARK3116_RCV(serial, 20, 0xFE, 0xC0, 0x0000, 0x0006, 0xFF, buf);
 138
 139         /* set 9600 baud & do some init?! */
 140         ARK3116_SND(serial, 147, 0xFE, 0x40, 0x0083, 0x0003);
 141         ARK3116_SND(serial, 148, 0xFE, 0x40, 0x0038, 0x0000);
 142         ARK3116_SND(serial, 149, 0xFE, 0x40, 0x0001, 0x0001);
 143         ARK3116_SND(serial, 150, 0xFE, 0x40, 0x0003, 0x0003);
 144         ARK3116_RCV(serial, 151, 0xFE, 0xC0, 0x0000, 0x0004, 0x03, buf);
 145         ARK3116_SND(serial, 152, 0xFE, 0x40, 0x0000, 0x0003);
 146         ARK3116_RCV(serial, 153, 0xFE, 0xC0, 0x0000, 0x0003, 0x00, buf);
 147         ARK3116_SND(serial, 154, 0xFE, 0x40, 0x0003, 0x0003);
 148
 149         kfree(buf);
 150         return 0;
 151
 152 cleanup:
 153         for (--i; i >= 0; --i)
 154                 usb_set_serial_port_data(serial->port[i], NULL);
 155         return -ENOMEM;
 156 }
 157
 158 static void ark3116_set_termios(struct usb_serial_port *port,
 159                                 struct ktermios *old_termios)
 160 {
 161         struct usb_serial *serial = port->serial;
 162         struct ark3116_private *priv = usb_get_serial_port_data(port);
 163         unsigned int cflag = port->tty->termios->c_cflag;
 164         unsigned long flags;
 165         int baud;
 166         int ark3116_baud;
 167         char *buf;
 168         char config;
 169
 170         config = 0;
 171
 172         dbg("%s - port %d", __FUNCTION__, port->number);
 173
 174         if ((!port->tty) || (!port->tty->termios)) {
 175                 dbg("%s - no tty structures", __FUNCTION__);
 176                 return;
 177         }
 178
 179         spin_lock_irqsave(&priv->lock, flags);
 180         if (!priv->termios_initialized) {
 181                 *(port->tty->termios) = tty_std_termios;
 182                 port->tty->termios->c_cflag = B9600 | CS8
 183                                               | CREAD | HUPCL | CLOCAL;
 184                 priv->termios_initialized = 1;
 185         }
 186         spin_unlock_irqrestore(&priv->lock, flags);
 187
 188         cflag = port->tty->termios->c_cflag;
 189
 190         /* check that they really want us to change something: */
 191         if (old_termios) {
 192                 if ((cflag == old_termios->c_cflag) &&
 193                     (RELEVANT_IFLAG(port->tty->termios->c_iflag) ==
 194                      RELEVANT_IFLAG(old_termios->c_iflag))) {
 195                         dbg("%s - nothing to change...", __FUNCTION__);
 196                         return;
 197                 }
 198         }
 199
 200         buf = kmalloc(1, GFP_KERNEL);
 201         if (!buf) {
 202                 dbg("error kmalloc");
 203                 return;
 204         }
 205
 206         /* set data bit count (8/7/6/5) */
 207         if (cflag & CSIZE) {
 208                 switch (cflag & CSIZE) {
 209                 case CS5:
 210                         config |= 0x00;
 211                         dbg("setting CS5");
 212                         break;
 213                 case CS6:
 214                         config |= 0x01;
 215                         dbg("setting CS6");
 216                         break;
 217                 case CS7:
 218                         config |= 0x02;
 219                         dbg("setting CS7");
 220                         break;
 221                 default:
 222                         err("CSIZE was set but not CS5-CS8, using CS8!");
 223                         /* fall through */
 224                 case CS8:
 225                         config |= 0x03;
 226                         dbg("setting CS8");
 227                         break;
 228                 }
 229         }
 230
 231         /* set parity (NONE/EVEN/ODD) */
 232         if (cflag & PARENB) {
 233                 if (cflag & PARODD) {
 234                         config |= 0x08;
 235                         dbg("setting parity to ODD");
 236                 } else {
 237                         config |= 0x18;
 238                         dbg("setting parity to EVEN");
 239                 }
 240         } else {
 241                 dbg("setting parity to NONE");
 242         }
 243
 244         /* set stop bit (1/2) */
 245         if (cflag & CSTOPB) {
 246                 config |= 0x04;
 247                 dbg("setting 2 stop bits");
 248         } else {
 249                 dbg("setting 1 stop bit");
 250         }
 251
 252         /* set baudrate */
 253         baud = 0;
 254         switch (cflag & CBAUD) {
 255                 case B0:
 256                         err("can't set 0 baud, using 9600 instead");
 257                         break;
 258                 case B75:       baud = 75;      break;
 259                 case B150:      baud = 150;     break;
 260                 case B300:      baud = 300;     break;
 261                 case B600:      baud = 600;     break;
 262                 case B1200:     baud = 1200;    break;
 263                 case B1800:     baud = 1800;    break;
 264                 case B2400:     baud = 2400;    break;
 265                 case B4800:     baud = 4800;    break;
 266                 case B9600:     baud = 9600;    break;
 267                 case B19200:    baud = 19200;   break;
 268                 case B38400:    baud = 38400;   break;
 269                 case B57600:    baud = 57600;   break;
 270                 case B115200:   baud = 115200;  break;
 271                 case B230400:   baud = 230400;  break;
 272                 case B460800:   baud = 460800;  break;
 273                 default:
 274                         dbg("does not support the baudrate requested (fix it)");
 275                         break;
 276         }
 277
 278         /* set 9600 as default (if given baudrate is invalid for example) */
 279         if (baud == 0)
 280                 baud = 9600;
 281
 282         /*
 283          * found by try'n'error, be careful, maybe there are other options
 284          * for multiplicator etc!
 285          */
 286         if (baud == 460800)
 287                 /* strange, for 460800 the formula is wrong
 288                  * if using round() then 9600baud is wrong) */
 289                 ark3116_baud = 7;
 290         else
 291                 ark3116_baud = 3000000 / baud;
 292
 293         /* ? */
 294         ARK3116_RCV(serial, 0, 0xFE, 0xC0, 0x0000, 0x0003, 0x03, buf);
 295
 296         /* offset = buf[0]; */
 297         /* offset = 0x03; */
 298         /* dbg("using 0x%04X as target for 0x0003:", 0x0080 + offset); */
 299
 300         /* set baudrate */
 301         dbg("setting baudrate to %d (->reg=%d)", baud, ark3116_baud);
 302         ARK3116_SND(serial, 147, 0xFE, 0x40, 0x0083, 0x0003);
 303         ARK3116_SND(serial, 148, 0xFE, 0x40,
 304                             (ark3116_baud & 0x00FF), 0x0000);
 305         ARK3116_SND(serial, 149, 0xFE, 0x40,
 306                             (ark3116_baud & 0xFF00) >> 8, 0x0001);
 307         ARK3116_SND(serial, 150, 0xFE, 0x40, 0x0003, 0x0003);
 308
 309         /* ? */
 310         ARK3116_RCV(serial, 151, 0xFE, 0xC0, 0x0000, 0x0004, 0x03, buf);
 311         ARK3116_SND(serial, 152, 0xFE, 0x40, 0x0000, 0x0003);
 312
 313         /* set data bit count, stop bit count & parity: */
 314         dbg("updating bit count, stop bit or parity (cfg=0x%02X)", config);
 315         ARK3116_RCV(serial, 153, 0xFE, 0xC0, 0x0000, 0x0003, 0x00, buf);
 316         ARK3116_SND(serial, 154, 0xFE, 0x40, config, 0x0003);
 317
 318         if (cflag & CRTSCTS)
 319                 dbg("CRTSCTS not supported by chipset?!");
 320
 321         /* TEST ARK3116_SND(154, 0xFE, 0x40, 0xFFFF, 0x0006); */
 322
 323         kfree(buf);
 324         return;
 325 }
 326
 327 static int ark3116_open(struct usb_serial_port *port, struct file *filp)
 328 {
 329         struct ktermios tmp_termios;
 330         struct usb_serial *serial = port->serial;
 331         char *buf;
 332         int result = 0;
 333
 334         dbg("%s - port %d", __FUNCTION__, port->number);
 335
 336         buf = kmalloc(1, GFP_KERNEL);
 337         if (!buf) {
 338                 dbg("error kmalloc -> out of mem?");
 339                 return -ENOMEM;
 340         }
 341
 342         result = usb_serial_generic_open(port, filp);
 343         if (result)
 344                 return result;
 345
 346         /* open */
 347         ARK3116_RCV(serial, 111, 0xFE, 0xC0, 0x0000, 0x0003, 0x02, buf);
 348
 349         ARK3116_SND(serial, 112, 0xFE, 0x40, 0x0082, 0x0003);
 350         ARK3116_SND(serial, 113, 0xFE, 0x40, 0x001A, 0x0000);
 351         ARK3116_SND(serial, 114, 0xFE, 0x40, 0x0000, 0x0001);
 352         ARK3116_SND(serial, 115, 0xFE, 0x40, 0x0002, 0x0003);
 353
 354         ARK3116_RCV(serial, 116, 0xFE, 0xC0, 0x0000, 0x0004, 0x03, buf);
 355         ARK3116_SND(serial, 117, 0xFE, 0x40, 0x0002, 0x0004);
 356
 357         ARK3116_RCV(serial, 118, 0xFE, 0xC0, 0x0000, 0x0004, 0x02, buf);
 358         ARK3116_SND(serial, 119, 0xFE, 0x40, 0x0000, 0x0004);
 359
 360         ARK3116_RCV(serial, 120, 0xFE, 0xC0, 0x0000, 0x0004, 0x00, buf);
 361
 362         ARK3116_SND(serial, 121, 0xFE, 0x40, 0x0001, 0x0004);
 363
 364         ARK3116_RCV(serial, 122, 0xFE, 0xC0, 0x0000, 0x0004, 0x01, buf);
 365
 366         ARK3116_SND(serial, 123, 0xFE, 0x40, 0x0003, 0x0004);
 367
 368         /* returns different values (control lines?!) */
 369         ARK3116_RCV(serial, 124, 0xFE, 0xC0, 0x0000, 0x0006, 0xFF, buf);
 370
 371         /* initialise termios */
 372         if (port->tty)
 373                 ark3116_set_termios(port, &tmp_termios);
 374
 375         kfree(buf);
 376
 377         return result;
 378 }
 379
 380 static int ark3116_ioctl(struct usb_serial_port *port, struct file *file,
 381                          unsigned int cmd, unsigned long arg)
 382 {
 383         struct serial_struct serstruct;
 384         void __user *user_arg = (void __user *)arg;
 385
 386         switch (cmd) {
 387         case TIOCGSERIAL:
 388                 /* XXX: Some of these values are probably wrong. */
 389                 memset(&serstruct, 0, sizeof (serstruct));
 390                 serstruct.type = PORT_16654;
 391                 serstruct.line = port->serial->minor;
 392                 serstruct.port = port->number;
 393                 serstruct.custom_divisor = 0;
 394                 serstruct.baud_base = 460800;
 395
 396                 if (copy_to_user(user_arg, &serstruct, sizeof (serstruct)))
 397                         return -EFAULT;
 398
 399                 return 0;
 400         case TIOCSSERIAL:
 401                 if (copy_from_user(&serstruct, user_arg, sizeof (serstruct)))
 402                         return -EFAULT;
 403                 return 0;
 404         default:
 405                 dbg("%s cmd 0x%04x not supported", __FUNCTION__, cmd);
 406                 break;
 407         }
 408
 409         return -ENOIOCTLCMD;
 410 }
 411
 412 static int ark3116_tiocmget(struct usb_serial_port *port, struct file *file)
 413 {
 414         struct usb_serial *serial = port->serial;
 415         char *buf;
 416         char temp;
 417
 418         /* seems like serial port status info (RTS, CTS, ...) is stored
 419          * in reg(?) 0x0006
 420          * pcb connection point 11 = GND -> sets bit4 of response
 421          * pcb connection point  7 = GND -> sets bit6 of response
 422          */
 423
 424         buf = kmalloc(1, GFP_KERNEL);
 425         if (!buf) {
 426                 dbg("error kmalloc");
 427                 return -ENOMEM;
 428         }
 429
 430         /* read register */
 431         ARK3116_RCV_QUIET(serial, 0xFE, 0xC0, 0x0000, 0x0006, buf);
 432         temp = buf[0];
 433         kfree(buf);
 434
 435         /* i do not really know if bit4=CTS and bit6=DSR... just a
 436          * quick guess!
 437          */
 438         return (temp & (1<<4) ? TIOCM_CTS : 0)
 439                | (temp & (1<<6) ? TIOCM_DSR : 0);
 440 }
 441
 442 static struct usb_driver ark3116_driver = {
 443         .name =         "ark3116",
 444         .probe =        usb_serial_probe,
 445         .disconnect =   usb_serial_disconnect,
 446         .id_table =     id_table,
 447         .no_dynamic_id =        1,
 448 };
 449
 450 static struct usb_serial_driver ark3116_device = {
 451         .driver = {
 452                 .owner =        THIS_MODULE,
 453                 .name =         "ark3116",
 454         },
 455         .id_table =             id_table,
 456         .usb_driver =           &ark3116_driver,
 457         .num_interrupt_in =     1,
 458         .num_bulk_in =          1,
 459         .num_bulk_out =         1,
 460         .num_ports =            1,
 461         .attach =               ark3116_attach,
 462         .set_termios =          ark3116_set_termios,
 463         .ioctl =                ark3116_ioctl,
 464         .tiocmget =             ark3116_tiocmget,
 465         .open =                 ark3116_open,
 466 };
 467
 468 static int __init ark3116_init(void)
 469 {
 470         int retval;
 471
 472         retval = usb_serial_register(&ark3116_device);
 473         if (retval)
 474                 return retval;
 475         retval = usb_register(&ark3116_driver);
 476         if (retval)
 477                 usb_serial_deregister(&ark3116_device);
 478         return retval;
 479 }
 480
 481 static void __exit ark3116_exit(void)
 482 {
 483         usb_deregister(&ark3116_driver);
 484         usb_serial_deregister(&ark3116_device);
 485 }
 486
 487 module_init(ark3116_init);
 488 module_exit(ark3116_exit);
 489 MODULE_LICENSE("GPL");
 490
 491 module_param(debug, bool, S_IRUGO | S_IWUSR);
 492 MODULE_PARM_DESC(debug, "Debug enabled or not");
 493