drivers/media/rc/redrat3.c

   1 /*
   2  * USB RedRat3 IR Transceiver rc-core driver
   3  *
   4  * Copyright (c) 2011 by Jarod Wilson <jarod@redhat.com>
   5  *  based heavily on the work of Stephen Cox, with additional
   6  *  help from RedRat Ltd.
   7  *
   8  * This driver began life based an an old version of the first-generation
   9  * lirc_mceusb driver from the lirc 0.7.2 distribution. It was then
  10  * significantly rewritten by Stephen Cox with the aid of RedRat Ltd's
  11  * Chris Dodge.
  12  *
  13  * The driver was then ported to rc-core and significantly rewritten again,
  14  * by Jarod, using the in-kernel mceusb driver as a guide, after an initial
  15  * port effort was started by Stephen.
  16  *
  17  * TODO LIST:
  18  * - fix lirc not showing repeats properly
  19  * --
  20  *
  21  * The RedRat3 is a USB transceiver with both send & receive,
  22  * with 2 separate sensors available for receive to enable
  23  * both good long range reception for general use, and good
  24  * short range reception when required for learning a signal.
  25  *
  26  * http://www.redrat.co.uk/
  27  *
  28  * It uses its own little protocol to communicate, the required
  29  * parts of which are embedded within this driver.
  30  * --
  31  *
  32  * This program is free software; you can redistribute it and/or modify
  33  * it under the terms of the GNU General Public License as published by
  34  * the Free Software Foundation; either version 2 of the License, or
  35  * (at your option) any later version.
  36  *
  37  * This program is distributed in the hope that it will be useful,
  38  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  39  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  40  * GNU General Public License for more details.
  41  *
  42  * You should have received a copy of the GNU General Public License
  43  * along with this program; if not, write to the Free Software
  44  * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
  45  *
  46  */
  47
  48 #include <asm/unaligned.h>
  49 #include <linux/device.h>
  50 #include <linux/leds.h>
  51 #include <linux/module.h>
  52 #include <linux/slab.h>
  53 #include <linux/usb.h>
  54 #include <linux/usb/input.h>
  55 #include <media/rc-core.h>
  56
  57 /* Driver Information */
  58 #define DRIVER_AUTHOR "Jarod Wilson <jarod@redhat.com>"
  59 #define DRIVER_AUTHOR2 "The Dweller, Stephen Cox"
  60 #define DRIVER_DESC "RedRat3 USB IR Transceiver Driver"
  61 #define DRIVER_NAME "redrat3"
  62
  63 /* module parameters */
  64 #ifdef CONFIG_USB_DEBUG
  65 static int debug = 1;
  66 #else
  67 static int debug;
  68 #endif
  69
  70 #define RR3_DEBUG_STANDARD              0x1
  71 #define RR3_DEBUG_FUNCTION_TRACE        0x2
  72
  73 #define rr3_dbg(dev, fmt, ...)                                  \
  74         do {                                                    \
  75                 if (debug & RR3_DEBUG_STANDARD)                 \
  76                         dev_info(dev, fmt, ## __VA_ARGS__);     \
  77         } while (0)
  78
  79 #define rr3_ftr(dev, fmt, ...)                                  \
  80         do {                                                    \
  81                 if (debug & RR3_DEBUG_FUNCTION_TRACE)           \
  82                         dev_info(dev, fmt, ## __VA_ARGS__);     \
  83         } while (0)
  84
  85 /* bulk data transfer types */
  86 #define RR3_ERROR               0x01
  87 #define RR3_MOD_SIGNAL_IN       0x20
  88 #define RR3_MOD_SIGNAL_OUT      0x21
  89
  90 /* Get the RR firmware version */
  91 #define RR3_FW_VERSION          0xb1
  92 #define RR3_FW_VERSION_LEN      64
  93 /* Send encoded signal bulk-sent earlier*/
  94 #define RR3_TX_SEND_SIGNAL      0xb3
  95 #define RR3_SET_IR_PARAM        0xb7
  96 #define RR3_GET_IR_PARAM        0xb8
  97 /* Blink the red LED on the device */
  98 #define RR3_BLINK_LED           0xb9
  99 /* Read serial number of device */
 100 #define RR3_READ_SER_NO         0xba
 101 #define RR3_SER_NO_LEN          4
 102 /* Start capture with the RC receiver */
 103 #define RR3_RC_DET_ENABLE       0xbb
 104 /* Stop capture with the RC receiver */
 105 #define RR3_RC_DET_DISABLE      0xbc
 106 /* Return the status of RC detector capture */
 107 #define RR3_RC_DET_STATUS       0xbd
 108 /* Reset redrat */
 109 #define RR3_RESET               0xa0
 110
 111 /* Max number of lengths in the signal. */
 112 #define RR3_IR_IO_MAX_LENGTHS   0x01
 113 /* Periods to measure mod. freq. */
 114 #define RR3_IR_IO_PERIODS_MF    0x02
 115 /* Size of memory for main signal data */
 116 #define RR3_IR_IO_SIG_MEM_SIZE  0x03
 117 /* Delta value when measuring lengths */
 118 #define RR3_IR_IO_LENGTH_FUZZ   0x04
 119 /* Timeout for end of signal detection */
 120 #define RR3_IR_IO_SIG_TIMEOUT   0x05
 121 /* Minimum value for pause recognition. */
 122 #define RR3_IR_IO_MIN_PAUSE     0x06
 123
 124 /* Clock freq. of EZ-USB chip */
 125 #define RR3_CLK                 24000000
 126 /* Clock periods per timer count */
 127 #define RR3_CLK_PER_COUNT       12
 128 /* (RR3_CLK / RR3_CLK_PER_COUNT) */
 129 #define RR3_CLK_CONV_FACTOR     2000000
 130 /* USB bulk-in IR data endpoint address */
 131 #define RR3_BULK_IN_EP_ADDR     0x82
 132
 133 /* Size of the fixed-length portion of the signal */
 134 #define RR3_DRIVER_MAXLENS      128
 135 #define RR3_MAX_SIG_SIZE        512
 136 #define RR3_TIME_UNIT           50
 137 #define RR3_END_OF_SIGNAL       0x7f
 138 #define RR3_TX_TRAILER_LEN      2
 139 #define RR3_RX_MIN_TIMEOUT      5
 140 #define RR3_RX_MAX_TIMEOUT      2000
 141
 142 /* The 8051's CPUCS Register address */
 143 #define RR3_CPUCS_REG_ADDR      0x7f92
 144
 145 #define USB_RR3USB_VENDOR_ID    0x112a
 146 #define USB_RR3USB_PRODUCT_ID   0x0001
 147 #define USB_RR3IIUSB_PRODUCT_ID 0x0005
 148
 149 struct redrat3_header {
 150         __be16 length;
 151         __be16 transfer_type;
 152 } __packed;
 153
 154 /* sending and receiving irdata */
 155 struct redrat3_irdata {
 156         struct redrat3_header header;
 157         __be32 pause;
 158         __be16 mod_freq_count;
 159         __be16 num_periods;
 160         __u8 max_lengths;
 161         __u8 no_lengths;
 162         __be16 max_sig_size;
 163         __be16 sig_size;
 164         __u8 no_repeats;
 165         __be16 lens[RR3_DRIVER_MAXLENS]; /* not aligned */
 166         __u8 sigdata[RR3_MAX_SIG_SIZE];
 167 } __packed;
 168
 169 /* firmware errors */
 170 struct redrat3_error {
 171         struct redrat3_header header;
 172         __be16 fw_error;
 173 } __packed;
 174
 175 /* table of devices that work with this driver */
 176 static struct usb_device_id redrat3_dev_table[] = {
 177         /* Original version of the RedRat3 */
 178         {USB_DEVICE(USB_RR3USB_VENDOR_ID, USB_RR3USB_PRODUCT_ID)},
 179         /* Second Version/release of the RedRat3 - RetRat3-II */
 180         {USB_DEVICE(USB_RR3USB_VENDOR_ID, USB_RR3IIUSB_PRODUCT_ID)},
 181         {}                      /* Terminating entry */
 182 };
 183
 184 /* Structure to hold all of our device specific stuff */
 185 struct redrat3_dev {
 186         /* core device bits */
 187         struct rc_dev *rc;
 188         struct device *dev;
 189
 190         /* led control */
 191         struct led_classdev led;
 192         atomic_t flash;
 193         struct usb_ctrlrequest flash_control;
 194         struct urb *flash_urb;
 195         u8 flash_in_buf;
 196
 197         /* save off the usb device pointer */
 198         struct usb_device *udev;
 199
 200         /* the receive endpoint */
 201         struct usb_endpoint_descriptor *ep_in;
 202         /* the buffer to receive data */
 203         void *bulk_in_buf;
 204         /* urb used to read ir data */
 205         struct urb *read_urb;
 206
 207         /* the send endpoint */
 208         struct usb_endpoint_descriptor *ep_out;
 209
 210         /* usb dma */
 211         dma_addr_t dma_in;
 212
 213         /* rx signal timeout timer */
 214         struct timer_list rx_timeout;
 215         u32 hw_timeout;
 216
 217         /* Is the device currently transmitting?*/
 218         bool transmitting;
 219
 220         /* store for current packet */
 221         struct redrat3_irdata irdata;
 222         u16 bytes_read;
 223
 224         u32 carrier;
 225
 226         char name[64];
 227         char phys[64];
 228 };
 229
 230 /*
 231  * redrat3_issue_async
 232  *
 233  *  Issues an async read to the ir data in port..
 234  *  sets the callback to be redrat3_handle_async
 235  */
 236 static void redrat3_issue_async(struct redrat3_dev *rr3)
 237 {
 238         int res;
 239
 240         rr3_ftr(rr3->dev, "Entering %s\n", __func__);
 241
 242         res = usb_submit_urb(rr3->read_urb, GFP_ATOMIC);
 243         if (res)
 244                 rr3_dbg(rr3->dev, "%s: receive request FAILED! "
 245                         "(res %d, len %d)\n", __func__, res,
 246                         rr3->read_urb->transfer_buffer_length);
 247 }
 248
 249 static void redrat3_dump_fw_error(struct redrat3_dev *rr3, int code)
 250 {
 251         if (!rr3->transmitting && (code != 0x40))
 252                 dev_info(rr3->dev, "fw error code 0x%02x: ", code);
 253
 254         switch (code) {
 255         case 0x00:
 256                 pr_cont("No Error\n");
 257                 break;
 258
 259         /* Codes 0x20 through 0x2f are IR Firmware Errors */
 260         case 0x20:
 261                 pr_cont("Initial signal pulse not long enough "
 262                         "to measure carrier frequency\n");
 263                 break;
 264         case 0x21:
 265                 pr_cont("Not enough length values allocated for signal\n");
 266                 break;
 267         case 0x22:
 268                 pr_cont("Not enough memory allocated for signal data\n");
 269                 break;
 270         case 0x23:
 271                 pr_cont("Too many signal repeats\n");
 272                 break;
 273         case 0x28:
 274                 pr_cont("Insufficient memory available for IR signal "
 275                         "data memory allocation\n");
 276                 break;
 277         case 0x29:
 278                 pr_cont("Insufficient memory available "
 279                         "for IrDa signal data memory allocation\n");
 280                 break;
 281
 282         /* Codes 0x30 through 0x3f are USB Firmware Errors */
 283         case 0x30:
 284                 pr_cont("Insufficient memory available for bulk "
 285                         "transfer structure\n");
 286                 break;
 287
 288         /*
 289          * Other error codes... These are primarily errors that can occur in
 290          * the control messages sent to the redrat
 291          */
 292         case 0x40:
 293                 if (!rr3->transmitting)
 294                         pr_cont("Signal capture has been terminated\n");
 295                 break;
 296         case 0x41:
 297                 pr_cont("Attempt to set/get and unknown signal I/O "
 298                         "algorithm parameter\n");
 299                 break;
 300         case 0x42:
 301                 pr_cont("Signal capture already started\n");
 302                 break;
 303
 304         default:
 305                 pr_cont("Unknown Error\n");
 306                 break;
 307         }
 308 }
 309
 310 static u32 redrat3_val_to_mod_freq(struct redrat3_irdata *irdata)
 311 {
 312         u32 mod_freq = 0;
 313         u16 mod_freq_count = be16_to_cpu(irdata->mod_freq_count);
 314
 315         if (mod_freq_count != 0)
 316                 mod_freq = (RR3_CLK * be16_to_cpu(irdata->num_periods)) /
 317                         (mod_freq_count * RR3_CLK_PER_COUNT);
 318
 319         return mod_freq;
 320 }
 321
 322 /* this function scales down the figures for the same result... */
 323 static u32 redrat3_len_to_us(u32 length)
 324 {
 325         u32 biglen = length * 1000;
 326         u32 divisor = (RR3_CLK_CONV_FACTOR) / 1000;
 327         u32 result = (u32) (biglen / divisor);
 328
 329         /* don't allow zero lengths to go back, breaks lirc */
 330         return result ? result : 1;
 331 }
 332
 333 /*
 334  * convert us back into redrat3 lengths
 335  *
 336  * length * 1000   length * 1000000
 337  * ------------- = ---------------- = micro
 338  * rr3clk / 1000       rr3clk
 339
 340  * 6 * 2       4 * 3        micro * rr3clk          micro * rr3clk / 1000
 341  * ----- = 4   ----- = 6    -------------- = len    ---------------------
 342  *   3           2             1000000                    1000
 343  */
 344 static u32 redrat3_us_to_len(u32 microsec)
 345 {
 346         u32 result;
 347         u32 divisor;
 348
 349         microsec &= IR_MAX_DURATION;
 350         divisor = (RR3_CLK_CONV_FACTOR / 1000);
 351         result = (u32)(microsec * divisor) / 1000;
 352
 353         /* don't allow zero lengths to go back, breaks lirc */
 354         return result ? result : 1;
 355 }
 356
 357 /* timer callback to send reset event */
 358 static void redrat3_rx_timeout(unsigned long data)
 359 {
 360         struct redrat3_dev *rr3 = (struct redrat3_dev *)data;
 361
 362         rr3_dbg(rr3->dev, "calling ir_raw_event_reset\n");
 363         ir_raw_event_reset(rr3->rc);
 364 }
 365
 366 static void redrat3_process_ir_data(struct redrat3_dev *rr3)
 367 {
 368         DEFINE_IR_RAW_EVENT(rawir);
 369         struct device *dev;
 370         unsigned i, trailer = 0;
 371         unsigned sig_size, single_len, offset, val;
 372         unsigned long delay;
 373         u32 mod_freq;
 374
 375         if (!rr3) {
 376                 pr_err("%s called with no context!\n", __func__);
 377                 return;
 378         }
 379
 380         rr3_ftr(rr3->dev, "Entered %s\n", __func__);
 381
 382         dev = rr3->dev;
 383
 384         /* Make sure we reset the IR kfifo after a bit of inactivity */
 385         delay = usecs_to_jiffies(rr3->hw_timeout);
 386         mod_timer(&rr3->rx_timeout, jiffies + delay);
 387
 388         mod_freq = redrat3_val_to_mod_freq(&rr3->irdata);
 389         rr3_dbg(dev, "Got mod_freq of %u\n", mod_freq);
 390
 391         /* process each rr3 encoded byte into an int */
 392         sig_size = be16_to_cpu(rr3->irdata.sig_size);
 393         for (i = 0; i < sig_size; i++) {
 394                 offset = rr3->irdata.sigdata[i];
 395                 val = get_unaligned_be16(&rr3->irdata.lens[offset]);
 396                 single_len = redrat3_len_to_us(val);
 397
 398                 /* we should always get pulse/space/pulse/space samples */
 399                 if (i % 2)
 400                         rawir.pulse = false;
 401                 else
 402                         rawir.pulse = true;
 403
 404                 rawir.duration = US_TO_NS(single_len);
 405                 /* Save initial pulse length to fudge trailer */
 406                 if (i == 0)
 407                         trailer = rawir.duration;
 408                 /* cap the value to IR_MAX_DURATION */
 409                 rawir.duration &= IR_MAX_DURATION;
 410
 411                 rr3_dbg(dev, "storing %s with duration %d (i: %d)\n",
 412                         rawir.pulse ? "pulse" : "space", rawir.duration, i);
 413                 ir_raw_event_store_with_filter(rr3->rc, &rawir);
 414         }
 415
 416         /* add a trailing space, if need be */
 417         if (i % 2) {
 418                 rawir.pulse = false;
 419                 /* this duration is made up, and may not be ideal... */
 420                 if (trailer < US_TO_NS(1000))
 421                         rawir.duration = US_TO_NS(2800);
 422                 else
 423                         rawir.duration = trailer;
 424                 rr3_dbg(dev, "storing trailing space with duration %d\n",
 425                         rawir.duration);
 426                 ir_raw_event_store_with_filter(rr3->rc, &rawir);
 427         }
 428
 429         rr3_dbg(dev, "calling ir_raw_event_handle\n");
 430         ir_raw_event_handle(rr3->rc);
 431 }
 432
 433 /* Util fn to send rr3 cmds */
 434 static u8 redrat3_send_cmd(int cmd, struct redrat3_dev *rr3)
 435 {
 436         struct usb_device *udev;
 437         u8 *data;
 438         int res;
 439
 440         data = kzalloc(sizeof(u8), GFP_KERNEL);
 441         if (!data)
 442                 return -ENOMEM;
 443
 444         udev = rr3->udev;
 445         res = usb_control_msg(udev, usb_rcvctrlpipe(udev, 0), cmd,
 446                               USB_TYPE_VENDOR | USB_RECIP_DEVICE | USB_DIR_IN,
 447                               0x0000, 0x0000, data, sizeof(u8), HZ * 10);
 448
 449         if (res < 0) {
 450                 dev_err(rr3->dev, "%s: Error sending rr3 cmd res %d, data %d",
 451                         __func__, res, *data);
 452                 res = -EIO;
 453         } else
 454                 res = data[0];
 455
 456         kfree(data);
 457
 458         return res;
 459 }
 460
 461 /* Enables the long range detector and starts async receive */
 462 static int redrat3_enable_detector(struct redrat3_dev *rr3)
 463 {
 464         struct device *dev = rr3->dev;
 465         u8 ret;
 466
 467         rr3_ftr(dev, "Entering %s\n", __func__);
 468
 469         ret = redrat3_send_cmd(RR3_RC_DET_ENABLE, rr3);
 470         if (ret != 0)
 471                 dev_dbg(dev, "%s: unexpected ret of %d\n",
 472                         __func__, ret);
 473
 474         ret = redrat3_send_cmd(RR3_RC_DET_STATUS, rr3);
 475         if (ret != 1) {
 476                 dev_err(dev, "%s: detector status: %d, should be 1\n",
 477                         __func__, ret);
 478                 return -EIO;
 479         }
 480
 481         redrat3_issue_async(rr3);
 482
 483         return 0;
 484 }
 485
 486 static inline void redrat3_delete(struct redrat3_dev *rr3,
 487                                   struct usb_device *udev)
 488 {
 489         rr3_ftr(rr3->dev, "%s cleaning up\n", __func__);
 490         usb_kill_urb(rr3->read_urb);
 491         usb_kill_urb(rr3->flash_urb);
 492         usb_free_urb(rr3->read_urb);
 493         usb_free_urb(rr3->flash_urb);
 494         usb_free_coherent(udev, le16_to_cpu(rr3->ep_in->wMaxPacketSize),
 495                           rr3->bulk_in_buf, rr3->dma_in);
 496
 497         kfree(rr3);
 498 }
 499
 500 static u32 redrat3_get_timeout(struct redrat3_dev *rr3)
 501 {
 502         __be32 *tmp;
 503         u32 timeout = MS_TO_US(150); /* a sane default, if things go haywire */
 504         int len, ret, pipe;
 505
 506         len = sizeof(*tmp);
 507         tmp = kzalloc(len, GFP_KERNEL);
 508         if (!tmp) {
 509                 dev_warn(rr3->dev, "Memory allocation faillure\n");
 510                 return timeout;
 511         }
 512
 513         pipe = usb_rcvctrlpipe(rr3->udev, 0);
 514         ret = usb_control_msg(rr3->udev, pipe, RR3_GET_IR_PARAM,
 515                               USB_TYPE_VENDOR | USB_RECIP_DEVICE | USB_DIR_IN,
 516                               RR3_IR_IO_SIG_TIMEOUT, 0, tmp, len, HZ * 5);
 517         if (ret != len)
 518                 dev_warn(rr3->dev, "Failed to read timeout from hardware\n");
 519         else {
 520                 timeout = redrat3_len_to_us(be32_to_cpup(tmp));
 521
 522                 rr3_dbg(rr3->dev, "Got timeout of %d ms\n", timeout / 1000);
 523         }
 524
 525         kfree(tmp);
 526
 527         return timeout;
 528 }
 529
 530 static void redrat3_reset(struct redrat3_dev *rr3)
 531 {
 532         struct usb_device *udev = rr3->udev;
 533         struct device *dev = rr3->dev;
 534         int rc, rxpipe, txpipe;
 535         u8 *val;
 536         int len = sizeof(u8);
 537
 538         rr3_ftr(dev, "Entering %s\n", __func__);
 539
 540         rxpipe = usb_rcvctrlpipe(udev, 0);
 541         txpipe = usb_sndctrlpipe(udev, 0);
 542
 543         val = kmalloc(len, GFP_KERNEL);
 544         if (!val) {
 545                 dev_err(dev, "Memory allocation failure\n");
 546                 return;
 547         }
 548
 549         *val = 0x01;
 550         rc = usb_control_msg(udev, rxpipe, RR3_RESET,
 551                              USB_TYPE_VENDOR | USB_RECIP_DEVICE | USB_DIR_IN,
 552                              RR3_CPUCS_REG_ADDR, 0, val, len, HZ * 25);
 553         rr3_dbg(dev, "reset returned 0x%02x\n", rc);
 554
 555         *val = 5;
 556         rc = usb_control_msg(udev, txpipe, RR3_SET_IR_PARAM,
 557                              USB_TYPE_VENDOR | USB_RECIP_DEVICE | USB_DIR_OUT,
 558                              RR3_IR_IO_LENGTH_FUZZ, 0, val, len, HZ * 25);
 559         rr3_dbg(dev, "set ir parm len fuzz %d rc 0x%02x\n", *val, rc);
 560
 561         *val = RR3_DRIVER_MAXLENS;
 562         rc = usb_control_msg(udev, txpipe, RR3_SET_IR_PARAM,
 563                              USB_TYPE_VENDOR | USB_RECIP_DEVICE | USB_DIR_OUT,
 564                              RR3_IR_IO_MAX_LENGTHS, 0, val, len, HZ * 25);
 565         rr3_dbg(dev, "set ir parm max lens %d rc 0x%02x\n", *val, rc);
 566
 567         kfree(val);
 568 }
 569
 570 static void redrat3_get_firmware_rev(struct redrat3_dev *rr3)
 571 {
 572         int rc = 0;
 573         char *buffer;
 574
 575         rr3_ftr(rr3->dev, "Entering %s\n", __func__);
 576
 577         buffer = kzalloc(sizeof(char) * (RR3_FW_VERSION_LEN + 1), GFP_KERNEL);
 578         if (!buffer) {
 579                 dev_err(rr3->dev, "Memory allocation failure\n");
 580                 return;
 581         }
 582
 583         rc = usb_control_msg(rr3->udev, usb_rcvctrlpipe(rr3->udev, 0),
 584                              RR3_FW_VERSION,
 585                              USB_TYPE_VENDOR | USB_RECIP_DEVICE | USB_DIR_IN,
 586                              0, 0, buffer, RR3_FW_VERSION_LEN, HZ * 5);
 587
 588         if (rc >= 0)
 589                 dev_info(rr3->dev, "Firmware rev: %s", buffer);
 590         else
 591                 dev_err(rr3->dev, "Problem fetching firmware ID\n");
 592
 593         kfree(buffer);
 594         rr3_ftr(rr3->dev, "Exiting %s\n", __func__);
 595 }
 596
 597 static void redrat3_read_packet_start(struct redrat3_dev *rr3, unsigned len)
 598 {
 599         struct redrat3_header *header = rr3->bulk_in_buf;
 600         unsigned pktlen, pkttype;
 601
 602         rr3_ftr(rr3->dev, "Entering %s\n", __func__);
 603
 604         /* grab the Length and type of transfer */
 605         pktlen = be16_to_cpu(header->length);
 606         pkttype = be16_to_cpu(header->transfer_type);
 607
 608         if (pktlen > sizeof(rr3->irdata)) {
 609                 dev_warn(rr3->dev, "packet length %u too large\n", pktlen);
 610                 return;
 611         }
 612
 613         switch (pkttype) {
 614         case RR3_ERROR:
 615                 if (len >= sizeof(struct redrat3_error)) {
 616                         struct redrat3_error *error = rr3->bulk_in_buf;
 617                         unsigned fw_error = be16_to_cpu(error->fw_error);
 618                         redrat3_dump_fw_error(rr3, fw_error);
 619                 }
 620                 break;
 621
 622         case RR3_MOD_SIGNAL_IN:
 623                 memcpy(&rr3->irdata, rr3->bulk_in_buf, len);
 624                 rr3->bytes_read = len;
 625                 rr3_dbg(rr3->dev, "bytes_read %d, pktlen %d\n",
 626                         rr3->bytes_read, pktlen);
 627                 break;
 628
 629         default:
 630                 rr3_dbg(rr3->dev, "ignoring packet with type 0x%02x, len of %d, 0x%02x\n",
 631                                                 pkttype, len, pktlen);
 632                 break;
 633         }
 634 }
 635
 636 static void redrat3_read_packet_continue(struct redrat3_dev *rr3, unsigned len)
 637 {
 638         void *irdata = &rr3->irdata;
 639
 640         rr3_ftr(rr3->dev, "Entering %s\n", __func__);
 641
 642         if (len + rr3->bytes_read > sizeof(rr3->irdata)) {
 643                 dev_warn(rr3->dev, "too much data for packet\n");
 644                 rr3->bytes_read = 0;
 645                 return;
 646         }
 647
 648         memcpy(irdata + rr3->bytes_read, rr3->bulk_in_buf, len);
 649
 650         rr3->bytes_read += len;
 651         rr3_dbg(rr3->dev, "bytes_read %d, pktlen %d\n", rr3->bytes_read,
 652                                  be16_to_cpu(rr3->irdata.header.length));
 653 }
 654
 655 /* gather IR data from incoming urb, process it when we have enough */
 656 static int redrat3_get_ir_data(struct redrat3_dev *rr3, unsigned len)
 657 {
 658         struct device *dev = rr3->dev;
 659         unsigned pkttype;
 660         int ret = 0;
 661
 662         rr3_ftr(dev, "Entering %s\n", __func__);
 663
 664         if (rr3->bytes_read == 0 && len >= sizeof(struct redrat3_header)) {
 665                 redrat3_read_packet_start(rr3, len);
 666         } else if (rr3->bytes_read != 0) {
 667                 redrat3_read_packet_continue(rr3, len);
 668         } else if (rr3->bytes_read == 0) {
 669                 dev_err(dev, "error: no packet data read\n");
 670                 ret = -ENODATA;
 671                 goto out;
 672         }
 673
 674         if (rr3->bytes_read < be16_to_cpu(rr3->irdata.header.length) +
 675                                                 sizeof(struct redrat3_header))
 676                 /* we're still accumulating data */
 677                 return 0;
 678
 679         /* if we get here, we've got IR data to decode */
 680         pkttype = be16_to_cpu(rr3->irdata.header.transfer_type);
 681         if (pkttype == RR3_MOD_SIGNAL_IN)
 682                 redrat3_process_ir_data(rr3);
 683         else
 684                 rr3_dbg(dev, "discarding non-signal data packet (type 0x%02x)\n",
 685                                                                 pkttype);
 686
 687 out:
 688         rr3->bytes_read = 0;
 689         return ret;
 690 }
 691
 692 /* callback function from USB when async USB request has completed */
 693 static void redrat3_handle_async(struct urb *urb)
 694 {
 695         struct redrat3_dev *rr3;
 696         int ret;
 697
 698         if (!urb)
 699                 return;
 700
 701         rr3 = urb->context;
 702         if (!rr3) {
 703                 pr_err("%s called with invalid context!\n", __func__);
 704                 usb_unlink_urb(urb);
 705                 return;
 706         }
 707
 708         rr3_ftr(rr3->dev, "Entering %s\n", __func__);
 709
 710         switch (urb->status) {
 711         case 0:
 712                 ret = redrat3_get_ir_data(rr3, urb->actual_length);
 713                 if (!ret) {
 714                         /* no error, prepare to read more */
 715                         redrat3_issue_async(rr3);
 716                 }
 717                 break;
 718
 719         case -ECONNRESET:
 720         case -ENOENT:
 721         case -ESHUTDOWN:
 722                 usb_unlink_urb(urb);
 723                 return;
 724
 725         case -EPIPE:
 726         default:
 727                 dev_warn(rr3->dev, "Error: urb status = %d\n", urb->status);
 728                 rr3->bytes_read = 0;
 729                 break;
 730         }
 731 }
 732
 733 static u16 mod_freq_to_val(unsigned int mod_freq)
 734 {
 735         int mult = 6000000;
 736
 737         /* Clk used in mod. freq. generation is CLK24/4. */
 738         return 65536 - (mult / mod_freq);
 739 }
 740
 741 static int redrat3_set_tx_carrier(struct rc_dev *rcdev, u32 carrier)
 742 {
 743         struct redrat3_dev *rr3 = rcdev->priv;
 744         struct device *dev = rr3->dev;
 745
 746         rr3_dbg(dev, "Setting modulation frequency to %u", carrier);
 747         if (carrier == 0)
 748                 return -EINVAL;
 749
 750         rr3->carrier = carrier;
 751
 752         return carrier;
 753 }
 754
 755 static int redrat3_transmit_ir(struct rc_dev *rcdev, unsigned *txbuf,
 756                                 unsigned count)
 757 {
 758         struct redrat3_dev *rr3 = rcdev->priv;
 759         struct device *dev = rr3->dev;
 760         struct redrat3_irdata *irdata = NULL;
 761         int ret, ret_len;
 762         int lencheck, cur_sample_len, pipe;
 763         int *sample_lens = NULL;
 764         u8 curlencheck = 0;
 765         unsigned i, sendbuf_len;
 766
 767         rr3_ftr(dev, "Entering %s\n", __func__);
 768
 769         if (rr3->transmitting) {
 770                 dev_warn(dev, "%s: transmitter already in use\n", __func__);
 771                 return -EAGAIN;
 772         }
 773
 774         if (count > RR3_MAX_SIG_SIZE - RR3_TX_TRAILER_LEN)
 775                 return -EINVAL;
 776
 777         /* rr3 will disable rc detector on transmit */
 778         rr3->transmitting = true;
 779
 780         sample_lens = kzalloc(sizeof(int) * RR3_DRIVER_MAXLENS, GFP_KERNEL);
 781         if (!sample_lens) {
 782                 ret = -ENOMEM;
 783                 goto out;
 784         }
 785
 786         irdata = kzalloc(sizeof(*irdata), GFP_KERNEL);
 787         if (!irdata) {
 788                 ret = -ENOMEM;
 789                 goto out;
 790         }
 791
 792         for (i = 0; i < count; i++) {
 793                 cur_sample_len = redrat3_us_to_len(txbuf[i]);
 794                 if (cur_sample_len > 0xffff) {
 795                         dev_warn(dev, "transmit period of %uus truncated to %uus\n",
 796                                         txbuf[i], redrat3_len_to_us(0xffff));
 797                         cur_sample_len = 0xffff;
 798                 }
 799                 for (lencheck = 0; lencheck < curlencheck; lencheck++) {
 800                         if (sample_lens[lencheck] == cur_sample_len)
 801                                 break;
 802                 }
 803                 if (lencheck == curlencheck) {
 804                         rr3_dbg(dev, "txbuf[%d]=%u, pos %d, enc %u\n",
 805                                 i, txbuf[i], curlencheck, cur_sample_len);
 806                         if (curlencheck < RR3_DRIVER_MAXLENS) {
 807                                 /* now convert the value to a proper
 808                                  * rr3 value.. */
 809                                 sample_lens[curlencheck] = cur_sample_len;
 810                                 put_unaligned_be16(cur_sample_len,
 811                                                 &irdata->lens[curlencheck]);
 812                                 curlencheck++;
 813                         } else {
 814                                 ret = -EINVAL;
 815                                 goto out;
 816                         }
 817                 }
 818                 irdata->sigdata[i] = lencheck;
 819         }
 820
 821         irdata->sigdata[count] = RR3_END_OF_SIGNAL;
 822         irdata->sigdata[count + 1] = RR3_END_OF_SIGNAL;
 823
 824         sendbuf_len = offsetof(struct redrat3_irdata,
 825                                         sigdata[count + RR3_TX_TRAILER_LEN]);
 826         /* fill in our packet header */
 827         irdata->header.length = cpu_to_be16(sendbuf_len -
 828                                                 sizeof(struct redrat3_header));
 829         irdata->header.transfer_type = cpu_to_be16(RR3_MOD_SIGNAL_OUT);
 830         irdata->pause = cpu_to_be32(redrat3_len_to_us(100));
 831         irdata->mod_freq_count = cpu_to_be16(mod_freq_to_val(rr3->carrier));
 832         irdata->no_lengths = curlencheck;
 833         irdata->sig_size = cpu_to_be16(count + RR3_TX_TRAILER_LEN);
 834
 835         pipe = usb_sndbulkpipe(rr3->udev, rr3->ep_out->bEndpointAddress);
 836         ret = usb_bulk_msg(rr3->udev, pipe, irdata,
 837                             sendbuf_len, &ret_len, 10 * HZ);
 838         rr3_dbg(dev, "sent %d bytes, (ret %d)\n", ret_len, ret);
 839
 840         /* now tell the hardware to transmit what we sent it */
 841         pipe = usb_rcvctrlpipe(rr3->udev, 0);
 842         ret = usb_control_msg(rr3->udev, pipe, RR3_TX_SEND_SIGNAL,
 843                               USB_TYPE_VENDOR | USB_RECIP_DEVICE | USB_DIR_IN,
 844                               0, 0, irdata, 2, HZ * 10);
 845
 846         if (ret < 0)
 847                 dev_err(dev, "Error: control msg send failed, rc %d\n", ret);
 848         else
 849                 ret = count;
 850
 851 out:
 852         kfree(sample_lens);
 853         kfree(irdata);
 854
 855         rr3->transmitting = false;
 856         /* rr3 re-enables rc detector because it was enabled before */
 857
 858         return ret;
 859 }
 860
 861 static void redrat3_brightness_set(struct led_classdev *led_dev, enum
 862                                                 led_brightness brightness)
 863 {
 864         struct redrat3_dev *rr3 = container_of(led_dev, struct redrat3_dev,
 865                                                                         led);
 866
 867         if (brightness != LED_OFF && atomic_cmpxchg(&rr3->flash, 0, 1) == 0) {
 868                 int ret = usb_submit_urb(rr3->flash_urb, GFP_ATOMIC);
 869                 if (ret != 0) {
 870                         dev_dbg(rr3->dev, "%s: unexpected ret of %d\n",
 871                                 __func__, ret);
 872                         atomic_set(&rr3->flash, 0);
 873                 }
 874         }
 875 }
 876
 877 static void redrat3_led_complete(struct urb *urb)
 878 {
 879         struct redrat3_dev *rr3 = urb->context;
 880
 881         switch (urb->status) {
 882         case 0:
 883                 break;
 884         case -ECONNRESET:
 885         case -ENOENT:
 886         case -ESHUTDOWN:
 887                 usb_unlink_urb(urb);
 888                 return;
 889         case -EPIPE:
 890         default:
 891                 dev_dbg(rr3->dev, "Error: urb status = %d\n", urb->status);
 892                 break;
 893         }
 894
 895         rr3->led.brightness = LED_OFF;
 896         atomic_dec(&rr3->flash);
 897 }
 898
 899 static struct rc_dev *redrat3_init_rc_dev(struct redrat3_dev *rr3)
 900 {
 901         struct device *dev = rr3->dev;
 902         struct rc_dev *rc;
 903         int ret = -ENODEV;
 904         u16 prod = le16_to_cpu(rr3->udev->descriptor.idProduct);
 905
 906         rc = rc_allocate_device();
 907         if (!rc) {
 908                 dev_err(dev, "remote input dev allocation failed\n");
 909                 goto out;
 910         }
 911
 912         snprintf(rr3->name, sizeof(rr3->name), "RedRat3%s "
 913                  "Infrared Remote Transceiver (%04x:%04x)",
 914                  prod == USB_RR3IIUSB_PRODUCT_ID ? "-II" : "",
 915                  le16_to_cpu(rr3->udev->descriptor.idVendor), prod);
 916
 917         usb_make_path(rr3->udev, rr3->phys, sizeof(rr3->phys));
 918
 919         rc->input_name = rr3->name;
 920         rc->input_phys = rr3->phys;
 921         usb_to_input_id(rr3->udev, &rc->input_id);
 922         rc->dev.parent = dev;
 923         rc->priv = rr3;
 924         rc->driver_type = RC_DRIVER_IR_RAW;
 925         rc->allowed_protos = RC_BIT_ALL;
 926         rc->timeout = US_TO_NS(2750);
 927         rc->tx_ir = redrat3_transmit_ir;
 928         rc->s_tx_carrier = redrat3_set_tx_carrier;
 929         rc->driver_name = DRIVER_NAME;
 930         rc->rx_resolution = US_TO_NS(2);
 931         rc->map_name = RC_MAP_HAUPPAUGE;
 932
 933         ret = rc_register_device(rc);
 934         if (ret < 0) {
 935                 dev_err(dev, "remote dev registration failed\n");
 936                 goto out;
 937         }
 938
 939         return rc;
 940
 941 out:
 942         rc_free_device(rc);
 943         return NULL;
 944 }
 945
 946 static int redrat3_dev_probe(struct usb_interface *intf,
 947                              const struct usb_device_id *id)
 948 {
 949         struct usb_device *udev = interface_to_usbdev(intf);
 950         struct device *dev = &intf->dev;
 951         struct usb_host_interface *uhi;
 952         struct redrat3_dev *rr3;
 953         struct usb_endpoint_descriptor *ep;
 954         struct usb_endpoint_descriptor *ep_in = NULL;
 955         struct usb_endpoint_descriptor *ep_out = NULL;
 956         u8 addr, attrs;
 957         int pipe, i;
 958         int retval = -ENOMEM;
 959
 960         rr3_ftr(dev, "%s called\n", __func__);
 961
 962         uhi = intf->cur_altsetting;
 963
 964         /* find our bulk-in and bulk-out endpoints */
 965         for (i = 0; i < uhi->desc.bNumEndpoints; ++i) {
 966                 ep = &uhi->endpoint[i].desc;
 967                 addr = ep->bEndpointAddress;
 968                 attrs = ep->bmAttributes;
 969
 970                 if ((ep_in == NULL) &&
 971                     ((addr & USB_ENDPOINT_DIR_MASK) == USB_DIR_IN) &&
 972                     ((attrs & USB_ENDPOINT_XFERTYPE_MASK) ==
 973                      USB_ENDPOINT_XFER_BULK)) {
 974                         rr3_dbg(dev, "found bulk-in endpoint at 0x%02x\n",
 975                                 ep->bEndpointAddress);
 976                         /* data comes in on 0x82, 0x81 is for other data... */
 977                         if (ep->bEndpointAddress == RR3_BULK_IN_EP_ADDR)
 978                                 ep_in = ep;
 979                 }
 980
 981                 if ((ep_out == NULL) &&
 982                     ((addr & USB_ENDPOINT_DIR_MASK) == USB_DIR_OUT) &&
 983                     ((attrs & USB_ENDPOINT_XFERTYPE_MASK) ==
 984                      USB_ENDPOINT_XFER_BULK)) {
 985                         rr3_dbg(dev, "found bulk-out endpoint at 0x%02x\n",
 986                                 ep->bEndpointAddress);
 987                         ep_out = ep;
 988                 }
 989         }
 990
 991         if (!ep_in || !ep_out) {
 992                 dev_err(dev, "Couldn't find both in and out endpoints\n");
 993                 retval = -ENODEV;
 994                 goto no_endpoints;
 995         }
 996
 997         /* allocate memory for our device state and initialize it */
 998         rr3 = kzalloc(sizeof(*rr3), GFP_KERNEL);
 999         if (rr3 == NULL) {
1000                 dev_err(dev, "Memory allocation failure\n");
1001                 goto no_endpoints;
1002         }
1003
1004         rr3->dev = &intf->dev;
1005
1006         /* set up bulk-in endpoint */
1007         rr3->read_urb = usb_alloc_urb(0, GFP_KERNEL);
1008         if (!rr3->read_urb) {
1009                 dev_err(dev, "Read urb allocation failure\n");
1010                 goto error;
1011         }
1012
1013         rr3->ep_in = ep_in;
1014         rr3->bulk_in_buf = usb_alloc_coherent(udev,
1015                 le16_to_cpu(ep_in->wMaxPacketSize), GFP_ATOMIC, &rr3->dma_in);
1016         if (!rr3->bulk_in_buf) {
1017                 dev_err(dev, "Read buffer allocation failure\n");
1018                 goto error;
1019         }
1020
1021         pipe = usb_rcvbulkpipe(udev, ep_in->bEndpointAddress);
1022         usb_fill_bulk_urb(rr3->read_urb, udev, pipe, rr3->bulk_in_buf,
1023                 le16_to_cpu(ep_in->wMaxPacketSize), redrat3_handle_async, rr3);
1024
1025         rr3->ep_out = ep_out;
1026         rr3->udev = udev;
1027
1028         redrat3_reset(rr3);
1029         redrat3_get_firmware_rev(rr3);
1030
1031         /* might be all we need to do? */
1032         retval = redrat3_enable_detector(rr3);
1033         if (retval < 0)
1034                 goto error;
1035
1036         /* store current hardware timeout, in us, will use for kfifo resets */
1037         rr3->hw_timeout = redrat3_get_timeout(rr3);
1038
1039         /* default.. will get overridden by any sends with a freq defined */
1040         rr3->carrier = 38000;
1041
1042         /* led control */
1043         rr3->led.name = "redrat3:red:feedback";
1044         rr3->led.default_trigger = "rc-feedback";
1045         rr3->led.brightness_set = redrat3_brightness_set;
1046         retval = led_classdev_register(&intf->dev, &rr3->led);
1047         if (retval)
1048                 goto error;
1049
1050         atomic_set(&rr3->flash, 0);
1051         rr3->flash_urb = usb_alloc_urb(0, GFP_KERNEL);
1052         if (!rr3->flash_urb) {
1053                 retval = -ENOMEM;
1054                 goto led_free_error;
1055         }
1056
1057         /* setup packet is 'c0 b9 0000 0000 0001' */
1058         rr3->flash_control.bRequestType = 0xc0;
1059         rr3->flash_control.bRequest = RR3_BLINK_LED;
1060         rr3->flash_control.wLength = cpu_to_le16(1);
1061
1062         usb_fill_control_urb(rr3->flash_urb, udev, usb_rcvctrlpipe(udev, 0),
1063                         (unsigned char *)&rr3->flash_control,
1064                         &rr3->flash_in_buf, sizeof(rr3->flash_in_buf),
1065                         redrat3_led_complete, rr3);
1066
1067         rr3->rc = redrat3_init_rc_dev(rr3);
1068         if (!rr3->rc) {
1069                 retval = -ENOMEM;
1070                 goto led_free_error;
1071         }
1072         setup_timer(&rr3->rx_timeout, redrat3_rx_timeout, (unsigned long)rr3);
1073
1074         /* we can register the device now, as it is ready */
1075         usb_set_intfdata(intf, rr3);
1076
1077         rr3_ftr(dev, "Exiting %s\n", __func__);
1078         return 0;
1079
1080 led_free_error:
1081         led_classdev_unregister(&rr3->led);
1082 error:
1083         redrat3_delete(rr3, rr3->udev);
1084
1085 no_endpoints:
1086         dev_err(dev, "%s: retval = %x", __func__, retval);
1087
1088         return retval;
1089 }
1090
1091 static void redrat3_dev_disconnect(struct usb_interface *intf)
1092 {
1093         struct usb_device *udev = interface_to_usbdev(intf);
1094         struct redrat3_dev *rr3 = usb_get_intfdata(intf);
1095
1096         rr3_ftr(&intf->dev, "Entering %s\n", __func__);
1097
1098         if (!rr3)
1099                 return;
1100
1101         usb_set_intfdata(intf, NULL);
1102         rc_unregister_device(rr3->rc);
1103         led_classdev_unregister(&rr3->led);
1104         del_timer_sync(&rr3->rx_timeout);
1105         redrat3_delete(rr3, udev);
1106
1107         rr3_ftr(&intf->dev, "RedRat3 IR Transceiver now disconnected\n");
1108 }
1109
1110 static int redrat3_dev_suspend(struct usb_interface *intf, pm_message_t message)
1111 {
1112         struct redrat3_dev *rr3 = usb_get_intfdata(intf);
1113         rr3_ftr(rr3->dev, "suspend\n");
1114         led_classdev_suspend(&rr3->led);
1115         usb_kill_urb(rr3->read_urb);
1116         usb_kill_urb(rr3->flash_urb);
1117         return 0;
1118 }
1119
1120 static int redrat3_dev_resume(struct usb_interface *intf)
1121 {
1122         struct redrat3_dev *rr3 = usb_get_intfdata(intf);
1123         rr3_ftr(rr3->dev, "resume\n");
1124         if (usb_submit_urb(rr3->read_urb, GFP_ATOMIC))
1125                 return -EIO;
1126         led_classdev_resume(&rr3->led);
1127         return 0;
1128 }
1129
1130 static struct usb_driver redrat3_dev_driver = {
1131         .name           = DRIVER_NAME,
1132         .probe          = redrat3_dev_probe,
1133         .disconnect     = redrat3_dev_disconnect,
1134         .suspend        = redrat3_dev_suspend,
1135         .resume         = redrat3_dev_resume,
1136         .reset_resume   = redrat3_dev_resume,
1137         .id_table       = redrat3_dev_table
1138 };
1139
1140 module_usb_driver(redrat3_dev_driver);
1141
1142 MODULE_DESCRIPTION(DRIVER_DESC);
1143 MODULE_AUTHOR(DRIVER_AUTHOR);
1144 MODULE_AUTHOR(DRIVER_AUTHOR2);
1145 MODULE_LICENSE("GPL");
1146 MODULE_DEVICE_TABLE(usb, redrat3_dev_table);
1147
1148 module_param(debug, int, S_IRUGO | S_IWUSR);
1149 MODULE_PARM_DESC(debug, "Enable module debug spew. 0 = no debugging (default) "
1150                  "0x1 = standard debug messages, 0x2 = function tracing debug. "
1151                  "Flag bits are addative (i.e., 0x3 for both debug types).");