drivers/net/irda/mcs7780.c

   1 /*****************************************************************************
   2 *
   3 * Filename:      mcs7780.c
   4 * Version:       0.4-alpha
   5 * Description:   Irda MosChip USB Dongle Driver
   6 * Authors:       Lukasz Stelmach <stlman@poczta.fm>
   7 *                Brian Pugh <bpugh@cs.pdx.edu>
   8 *                Judy Fischbach <jfisch@cs.pdx.edu>
   9 *
  10 *       Based on stir4200 driver, but some things done differently.
  11 *       Based on earlier driver by Paul Stewart <stewart@parc.com>
  12 *
  13 *       Copyright (C) 2000, Roman Weissgaerber <weissg@vienna.at>
  14 *       Copyright (C) 2001, Dag Brattli <dag@brattli.net>
  15 *       Copyright (C) 2001, Jean Tourrilhes <jt@hpl.hp.com>
  16 *       Copyright (C) 2004, Stephen Hemminger <shemminger@osdl.org>
  17 *       Copyright (C) 2005, Lukasz Stelmach <stlman@poczta.fm>
  18 *       Copyright (C) 2005, Brian Pugh <bpugh@cs.pdx.edu>
  19 *       Copyright (C) 2005, Judy Fischbach <jfisch@cs.pdx.edu>
  20 *
  21 *       This program is free software; you can redistribute it and/or modify
  22 *       it under the terms of the GNU General Public License as published by
  23 *       the Free Software Foundation; either version 2 of the License, or
  24 *       (at your option) any later version.
  25 *
  26 *       This program is distributed in the hope that it will be useful,
  27 *       but WITHOUT ANY WARRANTY; without even the implied warranty of
  28 *       MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  29 *       GNU General Public License for more details.
  30 *
  31 *       You should have received a copy of the GNU General Public License
  32 *       along with this program; if not, write to the Free Software
  33 *       Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
  34 *
  35 *****************************************************************************/
  36
  37 /*
  38  * MCS7780 is a simple USB to IrDA bridge by MosChip. It is neither
  39  * compatibile with irda-usb nor with stir4200. Although it is quite
  40  * similar to the later as far as general idea of operation is concerned.
  41  * That is it requires the software to do all the framing job at SIR speeds.
  42  * The hardware does take care of the framing at MIR and FIR speeds.
  43  * It supports all speeds from 2400 through 4Mbps
  44  */
  45
  46 #include <linux/module.h>
  47 #include <linux/moduleparam.h>
  48 #include <linux/kernel.h>
  49 #include <linux/types.h>
  50 #include <linux/errno.h>
  51 #include <linux/slab.h>
  52 #include <linux/usb.h>
  53 #include <linux/device.h>
  54 #include <linux/crc32.h>
  55
  56 #include <asm/unaligned.h>
  57 #include <asm/byteorder.h>
  58 #include <asm/uaccess.h>
  59
  60 #include <net/irda/irda.h>
  61 #include <net/irda/wrapper.h>
  62 #include <net/irda/crc.h>
  63
  64 #include "mcs7780.h"
  65
  66 #define MCS_VENDOR_ID 0x9710
  67 #define MCS_PRODUCT_ID 0x7780
  68
  69 static struct usb_device_id mcs_table[] = {
  70         /* MosChip Corp.,  MCS7780 FIR-USB Adapter */
  71         {USB_DEVICE(MCS_VENDOR_ID, MCS_PRODUCT_ID)},
  72         {},
  73 };
  74
  75 MODULE_AUTHOR("Brian Pugh <bpugh@cs.pdx.edu>");
  76 MODULE_DESCRIPTION("IrDA-USB Dongle Driver for MosChip MCS7780");
  77 MODULE_VERSION("0.3alpha");
  78 MODULE_LICENSE("GPL");
  79
  80 MODULE_DEVICE_TABLE(usb, mcs_table);
  81
  82 static int qos_mtt_bits = 0x07 /* > 1ms */ ;
  83 module_param(qos_mtt_bits, int, 0);
  84 MODULE_PARM_DESC(qos_mtt_bits, "Minimum Turn Time");
  85
  86 static int receive_mode = 0x1;
  87 module_param(receive_mode, int, 0);
  88 MODULE_PARM_DESC(receive_mode,
  89                  "Receive mode of the device (1:fast, 0:slow, default:1)");
  90
  91 static int sir_tweak = 1;
  92 module_param(sir_tweak, int, 0444);
  93 MODULE_PARM_DESC(sir_tweak,
  94                  "Default pulse width (1:1.6us, 0:3/16 bit, default:1).");
  95
  96 static int transceiver_type = MCS_TSC_VISHAY;
  97 module_param(transceiver_type, int, 0444);
  98 MODULE_PARM_DESC(transceiver_type, "IR transceiver type, see mcs7780.h.");
  99
 100 static struct usb_driver mcs_driver = {
 101         .name = "mcs7780",
 102         .probe = mcs_probe,
 103         .disconnect = mcs_disconnect,
 104         .id_table = mcs_table,
 105 };
 106
 107 /* speed flag selection by direct addressing.
 108 addr = (speed >> 8) & 0x0f
 109
 110 0x1   57600      0x2  115200     0x4 1152000     0x5    9600
 111 0x6   38400      0x9    2400     0xa  576000     0xb   19200
 112
 113 4Mbps (or 2400) must be checked separately. Since it also has
 114 to be programmed in a different manner that is not a big problem.
 115 */
 116 static __u16 mcs_speed_set[16] = { 0,
 117         MCS_SPEED_57600,
 118         MCS_SPEED_115200,
 119         0,
 120         MCS_SPEED_1152000,
 121         MCS_SPEED_9600,
 122         MCS_SPEED_38400,
 123         0, 0,
 124         MCS_SPEED_2400,
 125         MCS_SPEED_576000,
 126         MCS_SPEED_19200,
 127         0, 0, 0,
 128 };
 129
 130 /* Set given 16 bit register with a 16 bit value. Send control message
 131  * to set dongle register. */
 132 static int mcs_set_reg(struct mcs_cb *mcs, __u16 reg, __u16 val)
 133 {
 134         struct usb_device *dev = mcs->usbdev;
 135         return usb_control_msg(dev, usb_sndctrlpipe(dev, 0), MCS_WRREQ,
 136                                MCS_WR_RTYPE, val, reg, NULL, 0,
 137                                msecs_to_jiffies(MCS_CTRL_TIMEOUT));
 138 }
 139
 140 /* Get 16 bit register value. Send contol message to read dongle register. */
 141 static int mcs_get_reg(struct mcs_cb *mcs, __u16 reg, __u16 * val)
 142 {
 143         struct usb_device *dev = mcs->usbdev;
 144         int ret = usb_control_msg(dev, usb_rcvctrlpipe(dev, 0), MCS_RDREQ,
 145                                   MCS_RD_RTYPE, 0, reg, val, 2,
 146                                   msecs_to_jiffies(MCS_CTRL_TIMEOUT));
 147
 148         return ret;
 149 }
 150
 151 /* Setup a communication between mcs7780 and TFDU chips.  It is described
 152  * in more detail in the data sheet.  The setup sequence puts the the
 153  * vishay tranceiver into high speed mode.  It will also receive SIR speed
 154  * packets but at reduced sensitivity.
 155  */
 156
 157 /* 0: OK 1:ERROR */
 158 static inline int mcs_setup_transceiver_vishay(struct mcs_cb *mcs)
 159 {
 160         int ret = 0;
 161         __u16 rval;
 162
 163         /* mcs_get_reg should read exactly two bytes from the dongle */
 164         ret = mcs_get_reg(mcs, MCS_XCVR_REG, &rval);
 165         if (unlikely(ret != 2)) {
 166                 ret = -EIO;
 167                 goto error;
 168         }
 169
 170         /* The MCS_XCVR_CONF bit puts the transceiver into configuration
 171          * mode.  The MCS_MODE0 bit must start out high (1) and then
 172          * transition to low and the MCS_STFIR and MCS_MODE1 bits must
 173          * be low.
 174          */
 175         rval |= (MCS_MODE0 | MCS_XCVR_CONF);
 176         rval &= ~MCS_STFIR;
 177         rval &= ~MCS_MODE1;
 178         ret = mcs_set_reg(mcs, MCS_XCVR_REG, rval);
 179         if (unlikely(ret))
 180                 goto error;
 181
 182         rval &= ~MCS_MODE0;
 183         ret = mcs_set_reg(mcs, MCS_XCVR_REG, rval);
 184         if (unlikely(ret))
 185                 goto error;
 186
 187         rval &= ~MCS_XCVR_CONF;
 188         ret = mcs_set_reg(mcs, MCS_XCVR_REG, rval);
 189         if (unlikely(ret))
 190                 goto error;
 191
 192         ret = 0;
 193 error:
 194         return ret;
 195 }
 196
 197 /* Setup a communication between mcs7780 and agilent chip. */
 198 static inline int mcs_setup_transceiver_agilent(struct mcs_cb *mcs)
 199 {
 200         net_warn_ratelimited("This transceiver type is not supported yet\n");
 201         return 1;
 202 }
 203
 204 /* Setup a communication between mcs7780 and sharp chip. */
 205 static inline int mcs_setup_transceiver_sharp(struct mcs_cb *mcs)
 206 {
 207         net_warn_ratelimited("This transceiver type is not supported yet\n");
 208         return 1;
 209 }
 210
 211 /* Common setup for all transceivers */
 212 static inline int mcs_setup_transceiver(struct mcs_cb *mcs)
 213 {
 214         int ret = 0;
 215         __u16 rval;
 216         const char *msg;
 217
 218         msg = "Basic transceiver setup error";
 219
 220         /* read value of MODE Register, set the DRIVER and RESET bits
 221         * and write value back out to MODE Register
 222         */
 223         ret = mcs_get_reg(mcs, MCS_MODE_REG, &rval);
 224         if(unlikely(ret != 2))
 225                 goto error;
 226         rval |= MCS_DRIVER;     /* put the mcs7780 into configuration mode. */
 227         ret = mcs_set_reg(mcs, MCS_MODE_REG, rval);
 228         if(unlikely(ret))
 229                 goto error;
 230
 231         rval = 0;               /* set min pulse width to 0 initially. */
 232         ret = mcs_set_reg(mcs, MCS_MINRXPW_REG, rval);
 233         if(unlikely(ret))
 234                 goto error;
 235
 236         ret = mcs_get_reg(mcs, MCS_MODE_REG, &rval);
 237         if(unlikely(ret != 2))
 238                 goto error;
 239
 240         rval &= ~MCS_FIR;       /* turn off fir mode. */
 241         if(mcs->sir_tweak)
 242                 rval |= MCS_SIR16US;    /* 1.6us pulse width */
 243         else
 244                 rval &= ~MCS_SIR16US;   /* 3/16 bit time pulse width */
 245
 246         /* make sure ask mode and back to back packets are off. */
 247         rval &= ~(MCS_BBTG | MCS_ASK);
 248
 249         rval &= ~MCS_SPEED_MASK;
 250         rval |= MCS_SPEED_9600;         /* make sure initial speed is 9600. */
 251         mcs->speed = 9600;
 252         mcs->new_speed = 0;             /* new_speed is set to 0 */
 253         rval &= ~MCS_PLLPWDN;           /* disable power down. */
 254
 255         /* make sure device determines direction and that the auto send sip
 256          * pulse are on.
 257          */
 258         rval |= MCS_DTD | MCS_SIPEN;
 259
 260         ret = mcs_set_reg(mcs, MCS_MODE_REG, rval);
 261         if(unlikely(ret))
 262                 goto error;
 263
 264         msg = "transceiver model specific setup error";
 265         switch (mcs->transceiver_type) {
 266         case MCS_TSC_VISHAY:
 267                 ret = mcs_setup_transceiver_vishay(mcs);
 268                 break;
 269
 270         case MCS_TSC_SHARP:
 271                 ret = mcs_setup_transceiver_sharp(mcs);
 272                 break;
 273
 274         case MCS_TSC_AGILENT:
 275                 ret = mcs_setup_transceiver_agilent(mcs);
 276                 break;
 277
 278         default:
 279                 net_warn_ratelimited("Unknown transceiver type: %d\n",
 280                                      mcs->transceiver_type);
 281                 ret = 1;
 282         }
 283         if (unlikely(ret))
 284                 goto error;
 285
 286         /* If transceiver is not SHARP, then if receive mode set
 287         * on the RXFAST bit in the XCVR Register otherwise unset it
 288         */
 289         if (mcs->transceiver_type != MCS_TSC_SHARP) {
 290
 291                 ret = mcs_get_reg(mcs, MCS_XCVR_REG, &rval);
 292                 if (unlikely(ret != 2))
 293                         goto error;
 294                 if (mcs->receive_mode)
 295                         rval |= MCS_RXFAST;
 296                 else
 297                         rval &= ~MCS_RXFAST;
 298                 ret = mcs_set_reg(mcs, MCS_XCVR_REG, rval);
 299                 if (unlikely(ret))
 300                         goto error;
 301         }
 302
 303         msg = "transceiver reset";
 304
 305         ret = mcs_get_reg(mcs, MCS_MODE_REG, &rval);
 306         if (unlikely(ret != 2))
 307                 goto error;
 308
 309         /* reset the mcs7780 so all changes take effect. */
 310         rval &= ~MCS_RESET;
 311         ret = mcs_set_reg(mcs, MCS_MODE_REG, rval);
 312         if (unlikely(ret))
 313                 goto error;
 314         else
 315                 return ret;
 316
 317 error:
 318         net_err_ratelimited("%s\n", msg);
 319         return ret;
 320 }
 321
 322 /* Wraps the data in format for SIR */
 323 static inline int mcs_wrap_sir_skb(struct sk_buff *skb, __u8 * buf)
 324 {
 325         int wraplen;
 326
 327         /* 2: full frame length, including "the length" */
 328         wraplen = async_wrap_skb(skb, buf + 2, 4094);
 329
 330         wraplen += 2;
 331         buf[0] = wraplen & 0xff;
 332         buf[1] = (wraplen >> 8) & 0xff;
 333
 334         return wraplen;
 335 }
 336
 337 /* Wraps the data in format for FIR */
 338 static unsigned mcs_wrap_fir_skb(const struct sk_buff *skb, __u8 *buf)
 339 {
 340         unsigned int len = 0;
 341         __u32 fcs = ~(crc32_le(~0, skb->data, skb->len));
 342
 343         /* add 2 bytes for length value and 4 bytes for fcs. */
 344         len = skb->len + 6;
 345
 346         /* The mcs7780 requires that the first two bytes are the packet
 347          * length in little endian order.  Note: the length value includes
 348          * the two bytes for the length value itself.
 349          */
 350         buf[0] = len & 0xff;
 351         buf[1] = (len >> 8) & 0xff;
 352         /* copy the data into the tx buffer. */
 353         skb_copy_from_linear_data(skb, buf + 2, skb->len);
 354         /* put the fcs in the last four bytes in little endian order. */
 355         buf[len - 4] = fcs & 0xff;
 356         buf[len - 3] = (fcs >> 8) & 0xff;
 357         buf[len - 2] = (fcs >> 16) & 0xff;
 358         buf[len - 1] = (fcs >> 24) & 0xff;
 359
 360         return len;
 361 }
 362
 363 /* Wraps the data in format for MIR */
 364 static unsigned mcs_wrap_mir_skb(const struct sk_buff *skb, __u8 *buf)
 365 {
 366         __u16 fcs = 0;
 367         int len = skb->len + 4;
 368
 369         fcs = ~(irda_calc_crc16(~fcs, skb->data, skb->len));
 370         /* put the total packet length in first.  Note: packet length
 371          * value includes the two bytes that hold the packet length
 372          * itself.
 373          */
 374         buf[0] = len & 0xff;
 375         buf[1] = (len >> 8) & 0xff;
 376         /* copy the data */
 377         skb_copy_from_linear_data(skb, buf + 2, skb->len);
 378         /* put the fcs in last two bytes in little endian order. */
 379         buf[len - 2] = fcs & 0xff;
 380         buf[len - 1] = (fcs >> 8) & 0xff;
 381
 382         return len;
 383 }
 384
 385 /* Unwrap received packets at MIR speed.  A 16 bit crc_ccitt checksum is
 386  * used for the fcs.  When performed over the entire packet the result
 387  * should be GOOD_FCS = 0xf0b8.  Hands the unwrapped data off to the IrDA
 388  * layer via a sk_buff.
 389  */
 390 static void mcs_unwrap_mir(struct mcs_cb *mcs, __u8 *buf, int len)
 391 {
 392         __u16 fcs;
 393         int new_len;
 394         struct sk_buff *skb;
 395
 396         /* Assume that the frames are going to fill a single packet
 397          * rather than span multiple packets.
 398          */
 399
 400         new_len = len - 2;
 401         if(unlikely(new_len <= 0)) {
 402                 net_err_ratelimited("%s short frame length %d\n",
 403                                     mcs->netdev->name, new_len);
 404                 ++mcs->netdev->stats.rx_errors;
 405                 ++mcs->netdev->stats.rx_length_errors;
 406                 return;
 407         }
 408         fcs = 0;
 409         fcs = irda_calc_crc16(~fcs, buf, len);
 410
 411         if(fcs != GOOD_FCS) {
 412                 net_err_ratelimited("crc error calc 0x%x len %d\n",
 413                                     fcs, new_len);
 414                 mcs->netdev->stats.rx_errors++;
 415                 mcs->netdev->stats.rx_crc_errors++;
 416                 return;
 417         }
 418
 419         skb = dev_alloc_skb(new_len + 1);
 420         if(unlikely(!skb)) {
 421                 ++mcs->netdev->stats.rx_dropped;
 422                 return;
 423         }
 424
 425         skb_reserve(skb, 1);
 426         skb_copy_to_linear_data(skb, buf, new_len);
 427         skb_put(skb, new_len);
 428         skb_reset_mac_header(skb);
 429         skb->protocol = htons(ETH_P_IRDA);
 430         skb->dev = mcs->netdev;
 431
 432         netif_rx(skb);
 433
 434         mcs->netdev->stats.rx_packets++;
 435         mcs->netdev->stats.rx_bytes += new_len;
 436 }
 437
 438 /* Unwrap received packets at FIR speed.  A 32 bit crc_ccitt checksum is
 439  * used for the fcs.  Hands the unwrapped data off to the IrDA
 440  * layer via a sk_buff.
 441  */
 442 static void mcs_unwrap_fir(struct mcs_cb *mcs, __u8 *buf, int len)
 443 {
 444         __u32 fcs;
 445         int new_len;
 446         struct sk_buff *skb;
 447
 448         /* Assume that the frames are going to fill a single packet
 449          * rather than span multiple packets.  This is most likely a false
 450          * assumption.
 451          */
 452
 453         new_len = len - 4;
 454         if(unlikely(new_len <= 0)) {
 455                 net_err_ratelimited("%s short frame length %d\n",
 456                                     mcs->netdev->name, new_len);
 457                 ++mcs->netdev->stats.rx_errors;
 458                 ++mcs->netdev->stats.rx_length_errors;
 459                 return;
 460         }
 461
 462         fcs = ~(crc32_le(~0, buf, new_len));
 463         if(fcs != get_unaligned_le32(buf + new_len)) {
 464                 net_err_ratelimited("crc error calc 0x%x len %d\n",
 465                                     fcs, new_len);
 466                 mcs->netdev->stats.rx_errors++;
 467                 mcs->netdev->stats.rx_crc_errors++;
 468                 return;
 469         }
 470
 471         skb = dev_alloc_skb(new_len + 1);
 472         if(unlikely(!skb)) {
 473                 ++mcs->netdev->stats.rx_dropped;
 474                 return;
 475         }
 476
 477         skb_reserve(skb, 1);
 478         skb_copy_to_linear_data(skb, buf, new_len);
 479         skb_put(skb, new_len);
 480         skb_reset_mac_header(skb);
 481         skb->protocol = htons(ETH_P_IRDA);
 482         skb->dev = mcs->netdev;
 483
 484         netif_rx(skb);
 485
 486         mcs->netdev->stats.rx_packets++;
 487         mcs->netdev->stats.rx_bytes += new_len;
 488 }
 489
 490
 491 /* Allocates urbs for both receive and transmit.
 492  * If alloc fails return error code 0 (fail) otherwise
 493  * return error code 1 (success).
 494  */
 495 static inline int mcs_setup_urbs(struct mcs_cb *mcs)
 496 {
 497         mcs->rx_urb = NULL;
 498
 499         mcs->tx_urb = usb_alloc_urb(0, GFP_KERNEL);
 500         if (!mcs->tx_urb)
 501                 return 0;
 502
 503         mcs->rx_urb = usb_alloc_urb(0, GFP_KERNEL);
 504         if (!mcs->rx_urb) {
 505                 usb_free_urb(mcs->tx_urb);
 506                 mcs->tx_urb = NULL;
 507                 return 0;
 508         }
 509
 510         return 1;
 511 }
 512
 513 /* Sets up state to be initially outside frame, gets receive urb,
 514  * sets status to successful and then submits the urb to start
 515  * receiving the data.
 516  */
 517 static inline int mcs_receive_start(struct mcs_cb *mcs)
 518 {
 519         mcs->rx_buff.in_frame = FALSE;
 520         mcs->rx_buff.state = OUTSIDE_FRAME;
 521
 522         usb_fill_bulk_urb(mcs->rx_urb, mcs->usbdev,
 523                           usb_rcvbulkpipe(mcs->usbdev, mcs->ep_in),
 524                           mcs->in_buf, 4096, mcs_receive_irq, mcs);
 525
 526         mcs->rx_urb->status = 0;
 527         return usb_submit_urb(mcs->rx_urb, GFP_KERNEL);
 528 }
 529
 530 /* Finds the in and out endpoints for the mcs control block */
 531 static inline int mcs_find_endpoints(struct mcs_cb *mcs,
 532                                      struct usb_host_endpoint *ep, int epnum)
 533 {
 534         int i;
 535         int ret = 0;
 536
 537         /* If no place to store the endpoints just return */
 538         if (!ep)
 539                 return ret;
 540
 541         /* cycle through all endpoints, find the first two that are DIR_IN */
 542         for (i = 0; i < epnum; i++) {
 543                 if (ep[i].desc.bEndpointAddress & USB_DIR_IN)
 544                         mcs->ep_in = ep[i].desc.bEndpointAddress;
 545                 else
 546                         mcs->ep_out = ep[i].desc.bEndpointAddress;
 547
 548                 /* MosChip says that the chip has only two bulk
 549                  * endpoints. Find one for each direction and move on.
 550                  */
 551                 if ((mcs->ep_in != 0) && (mcs->ep_out != 0)) {
 552                         ret = 1;
 553                         break;
 554                 }
 555         }
 556
 557         return ret;
 558 }
 559
 560 static void mcs_speed_work(struct work_struct *work)
 561 {
 562         struct mcs_cb *mcs = container_of(work, struct mcs_cb, work);
 563         struct net_device *netdev = mcs->netdev;
 564
 565         mcs_speed_change(mcs);
 566         netif_wake_queue(netdev);
 567 }
 568
 569 /* Function to change the speed of the mcs7780.  Fully supports SIR,
 570  * MIR, and FIR speeds.
 571  */
 572 static int mcs_speed_change(struct mcs_cb *mcs)
 573 {
 574         int ret = 0;
 575         int rst = 0;
 576         int cnt = 0;
 577         __u16 nspeed;
 578         __u16 rval;
 579
 580         nspeed = mcs_speed_set[(mcs->new_speed >> 8) & 0x0f];
 581
 582         do {
 583                 mcs_get_reg(mcs, MCS_RESV_REG, &rval);
 584         } while(cnt++ < 100 && (rval & MCS_IRINTX));
 585
 586         if (cnt > 100) {
 587                 net_err_ratelimited("unable to change speed\n");
 588                 ret = -EIO;
 589                 goto error;
 590         }
 591
 592         mcs_get_reg(mcs, MCS_MODE_REG, &rval);
 593
 594         /* MINRXPW values recommended by MosChip */
 595         if (mcs->new_speed <= 115200) {
 596                 rval &= ~MCS_FIR;
 597
 598                 if ((rst = (mcs->speed > 115200)))
 599                         mcs_set_reg(mcs, MCS_MINRXPW_REG, 0);
 600
 601         } else if (mcs->new_speed <= 1152000) {
 602                 rval &= ~MCS_FIR;
 603
 604                 if ((rst = !(mcs->speed == 576000 || mcs->speed == 1152000)))
 605                         mcs_set_reg(mcs, MCS_MINRXPW_REG, 5);
 606
 607         } else {
 608                 rval |= MCS_FIR;
 609
 610                 if ((rst = (mcs->speed != 4000000)))
 611                         mcs_set_reg(mcs, MCS_MINRXPW_REG, 5);
 612
 613         }
 614
 615         rval &= ~MCS_SPEED_MASK;
 616         rval |= nspeed;
 617
 618         ret = mcs_set_reg(mcs, MCS_MODE_REG, rval);
 619         if (unlikely(ret))
 620                 goto error;
 621
 622         if (rst)
 623                 switch (mcs->transceiver_type) {
 624                 case MCS_TSC_VISHAY:
 625                         ret = mcs_setup_transceiver_vishay(mcs);
 626                         break;
 627
 628                 case MCS_TSC_SHARP:
 629                         ret = mcs_setup_transceiver_sharp(mcs);
 630                         break;
 631
 632                 case MCS_TSC_AGILENT:
 633                         ret = mcs_setup_transceiver_agilent(mcs);
 634                         break;
 635
 636                 default:
 637                         ret = 1;
 638                         net_warn_ratelimited("Unknown transceiver type: %d\n",
 639                                              mcs->transceiver_type);
 640                 }
 641         if (unlikely(ret))
 642                 goto error;
 643
 644         mcs_get_reg(mcs, MCS_MODE_REG, &rval);
 645         rval &= ~MCS_RESET;
 646         ret = mcs_set_reg(mcs, MCS_MODE_REG, rval);
 647
 648         mcs->speed = mcs->new_speed;
 649 error:
 650         mcs->new_speed = 0;
 651         return ret;
 652 }
 653
 654 /* Ioctl calls not supported at this time.  Can be an area of future work. */
 655 static int mcs_net_ioctl(struct net_device *netdev, struct ifreq *rq, int cmd)
 656 {
 657         /* struct if_irda_req *irq = (struct if_irda_req *)rq; */
 658         /* struct mcs_cb *mcs = netdev_priv(netdev); */
 659         int ret = 0;
 660
 661         switch (cmd) {
 662         default:
 663                 ret = -EOPNOTSUPP;
 664         }
 665
 666         return ret;
 667 }
 668
 669 /* Network device is taken down, done by "ifconfig irda0 down" */
 670 static int mcs_net_close(struct net_device *netdev)
 671 {
 672         int ret = 0;
 673         struct mcs_cb *mcs = netdev_priv(netdev);
 674
 675         /* Stop transmit processing */
 676         netif_stop_queue(netdev);
 677
 678         kfree_skb(mcs->rx_buff.skb);
 679
 680         /* kill and free the receive and transmit URBs */
 681         usb_kill_urb(mcs->rx_urb);
 682         usb_free_urb(mcs->rx_urb);
 683         usb_kill_urb(mcs->tx_urb);
 684         usb_free_urb(mcs->tx_urb);
 685
 686         /* Stop and remove instance of IrLAP */
 687         if (mcs->irlap)
 688                 irlap_close(mcs->irlap);
 689
 690         mcs->irlap = NULL;
 691         return ret;
 692 }
 693
 694 /* Network device is taken up, done by "ifconfig irda0 up" */
 695 static int mcs_net_open(struct net_device *netdev)
 696 {
 697         struct mcs_cb *mcs = netdev_priv(netdev);
 698         char hwname[16];
 699         int ret = 0;
 700
 701         ret = usb_clear_halt(mcs->usbdev,
 702                              usb_sndbulkpipe(mcs->usbdev, mcs->ep_in));
 703         if (ret)
 704                 goto error1;
 705         ret = usb_clear_halt(mcs->usbdev,
 706                              usb_rcvbulkpipe(mcs->usbdev, mcs->ep_out));
 707         if (ret)
 708                 goto error1;
 709
 710         ret = mcs_setup_transceiver(mcs);
 711         if (ret)
 712                 goto error1;
 713
 714         ret = -ENOMEM;
 715
 716         /* Initialize for SIR/FIR to copy data directly into skb.  */
 717         mcs->receiving = 0;
 718         mcs->rx_buff.truesize = IRDA_SKB_MAX_MTU;
 719         mcs->rx_buff.skb = dev_alloc_skb(IRDA_SKB_MAX_MTU);
 720         if (!mcs->rx_buff.skb)
 721                 goto error1;
 722
 723         skb_reserve(mcs->rx_buff.skb, 1);
 724         mcs->rx_buff.head = mcs->rx_buff.skb->data;
 725         do_gettimeofday(&mcs->rx_time);
 726
 727         /*
 728          * Now that everything should be initialized properly,
 729          * Open new IrLAP layer instance to take care of us...
 730          * Note : will send immediately a speed change...
 731          */
 732         sprintf(hwname, "usb#%d", mcs->usbdev->devnum);
 733         mcs->irlap = irlap_open(netdev, &mcs->qos, hwname);
 734         if (!mcs->irlap) {
 735                 net_err_ratelimited("mcs7780: irlap_open failed\n");
 736                 goto error2;
 737         }
 738
 739         if (!mcs_setup_urbs(mcs))
 740                 goto error3;
 741
 742         ret = mcs_receive_start(mcs);
 743         if (ret)
 744                 goto error4;
 745
 746         netif_start_queue(netdev);
 747         return 0;
 748
 749 error4:
 750         usb_free_urb(mcs->rx_urb);
 751         usb_free_urb(mcs->tx_urb);
 752 error3:
 753         irlap_close(mcs->irlap);
 754 error2:
 755         kfree_skb(mcs->rx_buff.skb);
 756 error1:
 757         return ret;
 758 }
 759
 760 /* Receive callback function.  */
 761 static void mcs_receive_irq(struct urb *urb)
 762 {
 763         __u8 *bytes;
 764         struct mcs_cb *mcs = urb->context;
 765         int i;
 766         int ret;
 767
 768         if (!netif_running(mcs->netdev))
 769                 return;
 770
 771         if (urb->status)
 772                 return;
 773
 774         if (urb->actual_length > 0) {
 775                 bytes = urb->transfer_buffer;
 776
 777                 /* MCS returns frames without BOF and EOF
 778                  * I assume it returns whole frames.
 779                  */
 780                 /* SIR speed */
 781                 if(mcs->speed < 576000) {
 782                         async_unwrap_char(mcs->netdev, &mcs->netdev->stats,
 783                                   &mcs->rx_buff, 0xc0);
 784
 785                         for (i = 0; i < urb->actual_length; i++)
 786                                 async_unwrap_char(mcs->netdev, &mcs->netdev->stats,
 787                                           &mcs->rx_buff, bytes[i]);
 788
 789                         async_unwrap_char(mcs->netdev, &mcs->netdev->stats,
 790                                   &mcs->rx_buff, 0xc1);
 791                 }
 792                 /* MIR speed */
 793                 else if(mcs->speed == 576000 || mcs->speed == 1152000) {
 794                         mcs_unwrap_mir(mcs, urb->transfer_buffer,
 795                                 urb->actual_length);
 796                 }
 797                 /* FIR speed */
 798                 else {
 799                         mcs_unwrap_fir(mcs, urb->transfer_buffer,
 800                                 urb->actual_length);
 801                 }
 802                 do_gettimeofday(&mcs->rx_time);
 803         }
 804
 805         ret = usb_submit_urb(urb, GFP_ATOMIC);
 806 }
 807
 808 /* Transmit callback function.  */
 809 static void mcs_send_irq(struct urb *urb)
 810 {
 811         struct mcs_cb *mcs = urb->context;
 812         struct net_device *ndev = mcs->netdev;
 813
 814         if (unlikely(mcs->new_speed))
 815                 schedule_work(&mcs->work);
 816         else
 817                 netif_wake_queue(ndev);
 818 }
 819
 820 /* Transmit callback function.  */
 821 static netdev_tx_t mcs_hard_xmit(struct sk_buff *skb,
 822                                        struct net_device *ndev)
 823 {
 824         unsigned long flags;
 825         struct mcs_cb *mcs;
 826         int wraplen;
 827         int ret = 0;
 828
 829         netif_stop_queue(ndev);
 830         mcs = netdev_priv(ndev);
 831
 832         spin_lock_irqsave(&mcs->lock, flags);
 833
 834         mcs->new_speed = irda_get_next_speed(skb);
 835         if (likely(mcs->new_speed == mcs->speed))
 836                 mcs->new_speed = 0;
 837
 838         /* SIR speed */
 839         if(mcs->speed < 576000) {
 840                 wraplen = mcs_wrap_sir_skb(skb, mcs->out_buf);
 841         }
 842         /* MIR speed */
 843         else if(mcs->speed == 576000 || mcs->speed == 1152000) {
 844                 wraplen = mcs_wrap_mir_skb(skb, mcs->out_buf);
 845         }
 846         /* FIR speed */
 847         else {
 848                 wraplen = mcs_wrap_fir_skb(skb, mcs->out_buf);
 849         }
 850         usb_fill_bulk_urb(mcs->tx_urb, mcs->usbdev,
 851                           usb_sndbulkpipe(mcs->usbdev, mcs->ep_out),
 852                           mcs->out_buf, wraplen, mcs_send_irq, mcs);
 853
 854         if ((ret = usb_submit_urb(mcs->tx_urb, GFP_ATOMIC))) {
 855                 net_err_ratelimited("failed tx_urb: %d\n", ret);
 856                 switch (ret) {
 857                 case -ENODEV:
 858                 case -EPIPE:
 859                         break;
 860                 default:
 861                         mcs->netdev->stats.tx_errors++;
 862                         netif_start_queue(ndev);
 863                 }
 864         } else {
 865                 mcs->netdev->stats.tx_packets++;
 866                 mcs->netdev->stats.tx_bytes += skb->len;
 867         }
 868
 869         dev_kfree_skb(skb);
 870         spin_unlock_irqrestore(&mcs->lock, flags);
 871         return NETDEV_TX_OK;
 872 }
 873
 874 static const struct net_device_ops mcs_netdev_ops = {
 875         .ndo_open = mcs_net_open,
 876         .ndo_stop = mcs_net_close,
 877         .ndo_start_xmit = mcs_hard_xmit,
 878         .ndo_do_ioctl = mcs_net_ioctl,
 879 };
 880
 881 /*
 882  * This function is called by the USB subsystem for each new device in the
 883  * system.  Need to verify the device and if it is, then start handling it.
 884  */
 885 static int mcs_probe(struct usb_interface *intf,
 886                      const struct usb_device_id *id)
 887 {
 888         struct usb_device *udev = interface_to_usbdev(intf);
 889         struct net_device *ndev = NULL;
 890         struct mcs_cb *mcs;
 891         int ret = -ENOMEM;
 892
 893         ndev = alloc_irdadev(sizeof(*mcs));
 894         if (!ndev)
 895                 goto error1;
 896
 897         IRDA_DEBUG(1, "MCS7780 USB-IrDA bridge found at %d.\n", udev->devnum);
 898
 899         SET_NETDEV_DEV(ndev, &intf->dev);
 900
 901         ret = usb_reset_configuration(udev);
 902         if (ret != 0) {
 903                 net_err_ratelimited("mcs7780: usb reset configuration failed\n");
 904                 goto error2;
 905         }
 906
 907         mcs = netdev_priv(ndev);
 908         mcs->usbdev = udev;
 909         mcs->netdev = ndev;
 910         spin_lock_init(&mcs->lock);
 911
 912         /* Initialize QoS for this device */
 913         irda_init_max_qos_capabilies(&mcs->qos);
 914
 915         /* That's the Rx capability. */
 916         mcs->qos.baud_rate.bits &=
 917             IR_2400 | IR_9600 | IR_19200 | IR_38400 | IR_57600 | IR_115200
 918                 | IR_576000 | IR_1152000 | (IR_4000000 << 8);
 919
 920
 921         mcs->qos.min_turn_time.bits &= qos_mtt_bits;
 922         irda_qos_bits_to_value(&mcs->qos);
 923
 924         /* Speed change work initialisation*/
 925         INIT_WORK(&mcs->work, mcs_speed_work);
 926
 927         ndev->netdev_ops = &mcs_netdev_ops;
 928
 929         if (!intf->cur_altsetting) {
 930                 ret = -ENOMEM;
 931                 goto error2;
 932         }
 933
 934         ret = mcs_find_endpoints(mcs, intf->cur_altsetting->endpoint,
 935                                  intf->cur_altsetting->desc.bNumEndpoints);
 936         if (!ret) {
 937                 ret = -ENODEV;
 938                 goto error2;
 939         }
 940
 941         ret = register_netdev(ndev);
 942         if (ret != 0)
 943                 goto error2;
 944
 945         IRDA_DEBUG(1, "IrDA: Registered MosChip MCS7780 device as %s\n",
 946                    ndev->name);
 947
 948         mcs->transceiver_type = transceiver_type;
 949         mcs->sir_tweak = sir_tweak;
 950         mcs->receive_mode = receive_mode;
 951
 952         usb_set_intfdata(intf, mcs);
 953         return 0;
 954
 955 error2:
 956         free_netdev(ndev);
 957
 958 error1:
 959         return ret;
 960 }
 961
 962 /* The current device is removed, the USB layer tells us to shut down. */
 963 static void mcs_disconnect(struct usb_interface *intf)
 964 {
 965         struct mcs_cb *mcs = usb_get_intfdata(intf);
 966
 967         if (!mcs)
 968                 return;
 969
 970         cancel_work_sync(&mcs->work);
 971
 972         unregister_netdev(mcs->netdev);
 973         free_netdev(mcs->netdev);
 974
 975         usb_set_intfdata(intf, NULL);
 976         IRDA_DEBUG(0, "MCS7780 now disconnected.\n");
 977 }
 978
 979 module_usb_driver(mcs_driver);