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 <linux/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,
  67                     ((unsigned char *)buf)[0]);
  68         else
  69                 dbg("%03d < 0 bytes", seq);
  70 }
  71
  72 static inline void ARK3116_RCV_QUIET(struct usb_serial *serial,
  73                                      __u8 request, __u8 requesttype,
  74                                      __u16 value, __u16 index, char *buf)
  75 {
  76         usb_control_msg(serial->dev,
  77                         usb_rcvctrlpipe(serial->dev, 0),
  78                         request, requesttype, value, index,
  79                         buf, 0x0000001, 1000);
  80 }
  81
  82 static int ark3116_attach(struct usb_serial *serial)
  83 {
  84         char *buf;
  85         struct ark3116_private *priv;
  86         int i;
  87
  88         for (i = 0; i < serial->num_ports; ++i) {
  89                 priv = kzalloc(sizeof(struct ark3116_private), GFP_KERNEL);
  90                 if (!priv)
  91                         goto cleanup;
  92                 spin_lock_init(&priv->lock);
  93
  94                 usb_set_serial_port_data(serial->port[i], priv);
  95         }
  96
  97         buf = kmalloc(1, GFP_KERNEL);
  98         if (!buf) {
  99                 dbg("error kmalloc -> out of mem?");
 100                 goto cleanup;
 101         }
 102
 103         /* 3 */
 104         ARK3116_SND(serial, 3, 0xFE, 0x40, 0x0008, 0x0002);
 105         ARK3116_SND(serial, 4, 0xFE, 0x40, 0x0008, 0x0001);
 106         ARK3116_SND(serial, 5, 0xFE, 0x40, 0x0000, 0x0008);
 107         ARK3116_SND(serial, 6, 0xFE, 0x40, 0x0000, 0x000B);
 108
 109         /* <-- seq7 */
 110         ARK3116_RCV(serial,  7, 0xFE, 0xC0, 0x0000, 0x0003, 0x00, buf);
 111         ARK3116_SND(serial,  8, 0xFE, 0x40, 0x0080, 0x0003);
 112         ARK3116_SND(serial,  9, 0xFE, 0x40, 0x001A, 0x0000);
 113         ARK3116_SND(serial, 10, 0xFE, 0x40, 0x0000, 0x0001);
 114         ARK3116_SND(serial, 11, 0xFE, 0x40, 0x0000, 0x0003);
 115
 116         /* <-- seq12 */
 117         ARK3116_RCV(serial, 12, 0xFE, 0xC0, 0x0000, 0x0004, 0x00, buf);
 118         ARK3116_SND(serial, 13, 0xFE, 0x40, 0x0000, 0x0004);
 119
 120         /* 14 */
 121         ARK3116_RCV(serial, 14, 0xFE, 0xC0, 0x0000, 0x0004, 0x00, buf);
 122         ARK3116_SND(serial, 15, 0xFE, 0x40, 0x0000, 0x0004);
 123
 124         /* 16 */
 125         ARK3116_RCV(serial, 16, 0xFE, 0xC0, 0x0000, 0x0004, 0x00, buf);
 126         /* --> seq17 */
 127         ARK3116_SND(serial, 17, 0xFE, 0x40, 0x0001, 0x0004);
 128
 129         /* <-- seq18 */
 130         ARK3116_RCV(serial, 18, 0xFE, 0xC0, 0x0000, 0x0004, 0x01, buf);
 131
 132         /* --> seq19 */
 133         ARK3116_SND(serial, 19, 0xFE, 0x40, 0x0003, 0x0004);
 134
 135         /* <-- seq20 */
 136         /* seems like serial port status info (RTS, CTS, ...) */
 137         /* returns modem control line status?! */
 138         ARK3116_RCV(serial, 20, 0xFE, 0xC0, 0x0000, 0x0006, 0xFF, buf);
 139
 140         /* set 9600 baud & do some init?! */
 141         ARK3116_SND(serial, 147, 0xFE, 0x40, 0x0083, 0x0003);
 142         ARK3116_SND(serial, 148, 0xFE, 0x40, 0x0038, 0x0000);
 143         ARK3116_SND(serial, 149, 0xFE, 0x40, 0x0001, 0x0001);
 144         ARK3116_SND(serial, 150, 0xFE, 0x40, 0x0003, 0x0003);
 145         ARK3116_RCV(serial, 151, 0xFE, 0xC0, 0x0000, 0x0004, 0x03, buf);
 146         ARK3116_SND(serial, 152, 0xFE, 0x40, 0x0000, 0x0003);
 147         ARK3116_RCV(serial, 153, 0xFE, 0xC0, 0x0000, 0x0003, 0x00, buf);
 148         ARK3116_SND(serial, 154, 0xFE, 0x40, 0x0003, 0x0003);
 149
 150         kfree(buf);
 151         return 0;
 152
 153 cleanup:
 154         for (--i; i >= 0; --i) {
 155                 kfree(usb_get_serial_port_data(serial->port[i]));
 156                 usb_set_serial_port_data(serial->port[i], NULL);
 157         }
 158         return -ENOMEM;
 159 }
 160
 161 static void ark3116_set_termios(struct tty_struct *tty,
 162                                 struct usb_serial_port *port,
 163                                 struct ktermios *old_termios)
 164 {
 165         struct usb_serial *serial = port->serial;
 166         struct ark3116_private *priv = usb_get_serial_port_data(port);
 167         struct ktermios *termios = tty->termios;
 168         unsigned int cflag = termios->c_cflag;
 169         unsigned long flags;
 170         int baud;
 171         int ark3116_baud;
 172         char *buf;
 173         char config;
 174
 175         config = 0;
 176
 177         dbg("%s - port %d", __func__, port->number);
 178
 179         spin_lock_irqsave(&priv->lock, flags);
 180         if (!priv->termios_initialized) {
 181                 *termios = tty_std_termios;
 182                 termios->c_cflag = B9600 | CS8
 183                                               | CREAD | HUPCL | CLOCAL;
 184                 termios->c_ispeed = 9600;
 185                 termios->c_ospeed = 9600;
 186                 priv->termios_initialized = 1;
 187         }
 188         spin_unlock_irqrestore(&priv->lock, flags);
 189
 190         cflag = termios->c_cflag;
 191         termios->c_cflag &= ~(CMSPAR|CRTSCTS);
 192
 193         buf = kmalloc(1, GFP_KERNEL);
 194         if (!buf) {
 195                 dbg("error kmalloc");
 196                 *termios = *old_termios;
 197                 return;
 198         }
 199
 200         /* set data bit count (8/7/6/5) */
 201         if (cflag & CSIZE) {
 202                 switch (cflag & CSIZE) {
 203                 case CS5:
 204                         config |= 0x00;
 205                         dbg("setting CS5");
 206                         break;
 207                 case CS6:
 208                         config |= 0x01;
 209                         dbg("setting CS6");
 210                         break;
 211                 case CS7:
 212                         config |= 0x02;
 213                         dbg("setting CS7");
 214                         break;
 215                 default:
 216                         dbg("CSIZE was set but not CS5-CS8, using CS8!");
 217                         /* fall through */
 218                 case CS8:
 219                         config |= 0x03;
 220                         dbg("setting CS8");
 221                         break;
 222                 }
 223         }
 224
 225         /* set parity (NONE/EVEN/ODD) */
 226         if (cflag & PARENB) {
 227                 if (cflag & PARODD) {
 228                         config |= 0x08;
 229                         dbg("setting parity to ODD");
 230                 } else {
 231                         config |= 0x18;
 232                         dbg("setting parity to EVEN");
 233                 }
 234         } else {
 235                 dbg("setting parity to NONE");
 236         }
 237
 238         /* set stop bit (1/2) */
 239         if (cflag & CSTOPB) {
 240                 config |= 0x04;
 241                 dbg("setting 2 stop bits");
 242         } else {
 243                 dbg("setting 1 stop bit");
 244         }
 245
 246         /* set baudrate */
 247         baud = tty_get_baud_rate(tty);
 248
 249         switch (baud) {
 250         case 75:
 251         case 150:
 252         case 300:
 253         case 600:
 254         case 1200:
 255         case 1800:
 256         case 2400:
 257         case 4800:
 258         case 9600:
 259         case 19200:
 260         case 38400:
 261         case 57600:
 262         case 115200:
 263         case 230400:
 264         case 460800:
 265                 /* Report the resulting rate back to the caller */
 266                 tty_encode_baud_rate(tty, baud, baud);
 267                 break;
 268         /* set 9600 as default (if given baudrate is invalid for example) */
 269         default:
 270                 tty_encode_baud_rate(tty, 9600, 9600);
 271         case 0:
 272                 baud = 9600;
 273         }
 274
 275         /*
 276          * found by try'n'error, be careful, maybe there are other options
 277          * for multiplicator etc! (3.5 for example)
 278          */
 279         if (baud == 460800)
 280                 /* strange, for 460800 the formula is wrong
 281                  * if using round() then 9600baud is wrong) */
 282                 ark3116_baud = 7;
 283         else
 284                 ark3116_baud = 3000000 / baud;
 285
 286         /* ? */
 287         ARK3116_RCV(serial, 0, 0xFE, 0xC0, 0x0000, 0x0003, 0x03, buf);
 288
 289         /* offset = buf[0]; */
 290         /* offset = 0x03; */
 291         /* dbg("using 0x%04X as target for 0x0003:", 0x0080 + offset); */
 292
 293         /* set baudrate */
 294         dbg("setting baudrate to %d (->reg=%d)", baud, ark3116_baud);
 295         ARK3116_SND(serial, 147, 0xFE, 0x40, 0x0083, 0x0003);
 296         ARK3116_SND(serial, 148, 0xFE, 0x40,
 297                             (ark3116_baud & 0x00FF), 0x0000);
 298         ARK3116_SND(serial, 149, 0xFE, 0x40,
 299                             (ark3116_baud & 0xFF00) >> 8, 0x0001);
 300         ARK3116_SND(serial, 150, 0xFE, 0x40, 0x0003, 0x0003);
 301
 302         /* ? */
 303         ARK3116_RCV(serial, 151, 0xFE, 0xC0, 0x0000, 0x0004, 0x03, buf);
 304         ARK3116_SND(serial, 152, 0xFE, 0x40, 0x0000, 0x0003);
 305
 306         /* set data bit count, stop bit count & parity: */
 307         dbg("updating bit count, stop bit or parity (cfg=0x%02X)", config);
 308         ARK3116_RCV(serial, 153, 0xFE, 0xC0, 0x0000, 0x0003, 0x00, buf);
 309         ARK3116_SND(serial, 154, 0xFE, 0x40, config, 0x0003);
 310
 311         if (cflag & CRTSCTS)
 312                 dbg("CRTSCTS not supported by chipset?!");
 313
 314         /* TEST ARK3116_SND(154, 0xFE, 0x40, 0xFFFF, 0x0006); */
 315
 316         kfree(buf);
 317
 318         return;
 319 }
 320
 321 static int ark3116_open(struct tty_struct *tty, struct usb_serial_port *port,
 322                                         struct file *filp)
 323 {
 324         struct ktermios tmp_termios;
 325         struct usb_serial *serial = port->serial;
 326         char *buf;
 327         int result = 0;
 328
 329         dbg("%s - port %d", __func__, port->number);
 330
 331         buf = kmalloc(1, GFP_KERNEL);
 332         if (!buf) {
 333                 dbg("error kmalloc -> out of mem?");
 334                 return -ENOMEM;
 335         }
 336
 337         result = usb_serial_generic_open(tty, port, filp);
 338         if (result)
 339                 goto err_out;
 340
 341         /* open */
 342         ARK3116_RCV(serial, 111, 0xFE, 0xC0, 0x0000, 0x0003, 0x02, buf);
 343
 344         ARK3116_SND(serial, 112, 0xFE, 0x40, 0x0082, 0x0003);
 345         ARK3116_SND(serial, 113, 0xFE, 0x40, 0x001A, 0x0000);
 346         ARK3116_SND(serial, 114, 0xFE, 0x40, 0x0000, 0x0001);
 347         ARK3116_SND(serial, 115, 0xFE, 0x40, 0x0002, 0x0003);
 348
 349         ARK3116_RCV(serial, 116, 0xFE, 0xC0, 0x0000, 0x0004, 0x03, buf);
 350         ARK3116_SND(serial, 117, 0xFE, 0x40, 0x0002, 0x0004);
 351
 352         ARK3116_RCV(serial, 118, 0xFE, 0xC0, 0x0000, 0x0004, 0x02, buf);
 353         ARK3116_SND(serial, 119, 0xFE, 0x40, 0x0000, 0x0004);
 354
 355         ARK3116_RCV(serial, 120, 0xFE, 0xC0, 0x0000, 0x0004, 0x00, buf);
 356
 357         ARK3116_SND(serial, 121, 0xFE, 0x40, 0x0001, 0x0004);
 358
 359         ARK3116_RCV(serial, 122, 0xFE, 0xC0, 0x0000, 0x0004, 0x01, buf);
 360
 361         ARK3116_SND(serial, 123, 0xFE, 0x40, 0x0003, 0x0004);
 362
 363         /* returns different values (control lines?!) */
 364         ARK3116_RCV(serial, 124, 0xFE, 0xC0, 0x0000, 0x0006, 0xFF, buf);
 365
 366         /* initialise termios */
 367         if (tty)
 368                 ark3116_set_termios(tty, port, &tmp_termios);
 369
 370 err_out:
 371         kfree(buf);
 372
 373         return result;
 374 }
 375
 376 static int ark3116_ioctl(struct tty_struct *tty, struct file *file,
 377                          unsigned int cmd, unsigned long arg)
 378 {
 379         struct usb_serial_port *port = tty->driver_data;
 380         struct serial_struct serstruct;
 381         void __user *user_arg = (void __user *)arg;
 382
 383         switch (cmd) {
 384         case TIOCGSERIAL:
 385                 /* XXX: Some of these values are probably wrong. */
 386                 memset(&serstruct, 0, sizeof(serstruct));
 387                 serstruct.type = PORT_16654;
 388                 serstruct.line = port->serial->minor;
 389                 serstruct.port = port->number;
 390                 serstruct.custom_divisor = 0;
 391                 serstruct.baud_base = 460800;
 392
 393                 if (copy_to_user(user_arg, &serstruct, sizeof(serstruct)))
 394                         return -EFAULT;
 395
 396                 return 0;
 397         case TIOCSSERIAL:
 398                 if (copy_from_user(&serstruct, user_arg, sizeof(serstruct)))
 399                         return -EFAULT;
 400                 return 0;
 401         default:
 402                 dbg("%s cmd 0x%04x not supported", __func__, cmd);
 403                 break;
 404         }
 405
 406         return -ENOIOCTLCMD;
 407 }
 408
 409 static int ark3116_tiocmget(struct tty_struct *tty, struct file *file)
 410 {
 411         struct usb_serial_port *port = tty->driver_data;
 412         struct usb_serial *serial = port->serial;
 413         char *buf;
 414         char temp;
 415
 416         /* seems like serial port status info (RTS, CTS, ...) is stored
 417          * in reg(?) 0x0006
 418          * pcb connection point 11 = GND -> sets bit4 of response
 419          * pcb connection point  7 = GND -> sets bit6 of response
 420          */
 421
 422         buf = kmalloc(1, GFP_KERNEL);
 423         if (!buf) {
 424                 dbg("error kmalloc");
 425                 return -ENOMEM;
 426         }
 427
 428         /* read register */
 429         ARK3116_RCV_QUIET(serial, 0xFE, 0xC0, 0x0000, 0x0006, buf);
 430         temp = buf[0];
 431         kfree(buf);
 432
 433         /* i do not really know if bit4=CTS and bit6=DSR... just a
 434          * quick guess!
 435          */
 436         return (temp & (1<<4) ? TIOCM_CTS : 0)
 437                | (temp & (1<<6) ? TIOCM_DSR : 0);
 438 }
 439
 440 static struct usb_driver ark3116_driver = {
 441         .name =         "ark3116",
 442         .probe =        usb_serial_probe,
 443         .disconnect =   usb_serial_disconnect,
 444         .id_table =     id_table,
 445         .no_dynamic_id =        1,
 446 };
 447
 448 static struct usb_serial_driver ark3116_device = {
 449         .driver = {
 450                 .owner =        THIS_MODULE,
 451                 .name =         "ark3116",
 452         },
 453         .id_table =             id_table,
 454         .usb_driver =           &ark3116_driver,
 455         .num_ports =            1,
 456         .attach =               ark3116_attach,
 457         .set_termios =          ark3116_set_termios,
 458         .ioctl =                ark3116_ioctl,
 459         .tiocmget =             ark3116_tiocmget,
 460         .open =                 ark3116_open,
 461 };
 462
 463 static int __init ark3116_init(void)
 464 {
 465         int retval;
 466
 467         retval = usb_serial_register(&ark3116_device);
 468         if (retval)
 469                 return retval;
 470         retval = usb_register(&ark3116_driver);
 471         if (retval)
 472                 usb_serial_deregister(&ark3116_device);
 473         return retval;
 474 }
 475
 476 static void __exit ark3116_exit(void)
 477 {
 478         usb_deregister(&ark3116_driver);
 479         usb_serial_deregister(&ark3116_device);
 480 }
 481
 482 module_init(ark3116_init);
 483 module_exit(ark3116_exit);
 484 MODULE_LICENSE("GPL");
 485
 486 module_param(debug, bool, S_IRUGO | S_IWUSR);
 487 MODULE_PARM_DESC(debug, "Debug enabled or not");
 488