drivers/media/radio/si470x/radio-si470x-usb.c

   1 /*
   2  *  drivers/media/radio/si470x/radio-si470x-usb.c
   3  *
   4  *  USB driver for radios with Silicon Labs Si470x FM Radio Receivers
   5  *
   6  *  Copyright (c) 2009 Tobias Lorenz <tobias.lorenz@gmx.net>
   7  *
   8  * This program is free software; you can redistribute it and/or modify
   9  * it under the terms of the GNU General Public License as published by
  10  * the Free Software Foundation; either version 2 of the License, or
  11  * (at your option) any later version.
  12  *
  13  * This program is distributed in the hope that it will be useful,
  14  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  15  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  16  * GNU General Public License for more details.
  17  */
  18
  19
  20 /*
  21  * ToDo:
  22  * - add firmware download/update support
  23  */
  24
  25
  26 /* driver definitions */
  27 #define DRIVER_AUTHOR "Tobias Lorenz <tobias.lorenz@gmx.net>"
  28 #define DRIVER_CARD "Silicon Labs Si470x FM Radio Receiver"
  29 #define DRIVER_DESC "USB radio driver for Si470x FM Radio Receivers"
  30 #define DRIVER_VERSION "1.0.10"
  31
  32 /* kernel includes */
  33 #include <linux/usb.h>
  34 #include <linux/hid.h>
  35 #include <linux/slab.h>
  36
  37 #include "radio-si470x.h"
  38
  39
  40 /* USB Device ID List */
  41 static const struct usb_device_id si470x_usb_driver_id_table[] = {
  42         /* Silicon Labs USB FM Radio Reference Design */
  43         { USB_DEVICE_AND_INTERFACE_INFO(0x10c4, 0x818a, USB_CLASS_HID, 0, 0) },
  44         /* ADS/Tech FM Radio Receiver (formerly Instant FM Music) */
  45         { USB_DEVICE_AND_INTERFACE_INFO(0x06e1, 0xa155, USB_CLASS_HID, 0, 0) },
  46         /* KWorld USB FM Radio SnapMusic Mobile 700 (FM700) */
  47         { USB_DEVICE_AND_INTERFACE_INFO(0x1b80, 0xd700, USB_CLASS_HID, 0, 0) },
  48         /* Sanei Electric, Inc. FM USB Radio (sold as DealExtreme.com PCear) */
  49         { USB_DEVICE_AND_INTERFACE_INFO(0x10c5, 0x819a, USB_CLASS_HID, 0, 0) },
  50         /* Axentia ALERT FM USB Receiver */
  51         { USB_DEVICE_AND_INTERFACE_INFO(0x12cf, 0x7111, USB_CLASS_HID, 0, 0) },
  52         /* Terminating entry */
  53         { }
  54 };
  55 MODULE_DEVICE_TABLE(usb, si470x_usb_driver_id_table);
  56
  57
  58
  59 /**************************************************************************
  60  * Module Parameters
  61  **************************************************************************/
  62
  63 /* Radio Nr */
  64 static int radio_nr = -1;
  65 module_param(radio_nr, int, 0444);
  66 MODULE_PARM_DESC(radio_nr, "Radio Nr");
  67
  68 /* USB timeout */
  69 static unsigned int usb_timeout = 500;
  70 module_param(usb_timeout, uint, 0644);
  71 MODULE_PARM_DESC(usb_timeout, "USB timeout (ms): *500*");
  72
  73 /* RDS buffer blocks */
  74 static unsigned int rds_buf = 100;
  75 module_param(rds_buf, uint, 0444);
  76 MODULE_PARM_DESC(rds_buf, "RDS buffer entries: *100*");
  77
  78 /* RDS maximum block errors */
  79 static unsigned short max_rds_errors = 1;
  80 /* 0 means   0  errors requiring correction */
  81 /* 1 means 1-2  errors requiring correction (used by original USBRadio.exe) */
  82 /* 2 means 3-5  errors requiring correction */
  83 /* 3 means   6+ errors or errors in checkword, correction not possible */
  84 module_param(max_rds_errors, ushort, 0644);
  85 MODULE_PARM_DESC(max_rds_errors, "RDS maximum block errors: *1*");
  86
  87
  88
  89 /**************************************************************************
  90  * USB HID Reports
  91  **************************************************************************/
  92
  93 /* Reports 1-16 give direct read/write access to the 16 Si470x registers */
  94 /* with the (REPORT_ID - 1) corresponding to the register address across USB */
  95 /* endpoint 0 using GET_REPORT and SET_REPORT */
  96 #define REGISTER_REPORT_SIZE    (RADIO_REGISTER_SIZE + 1)
  97 #define REGISTER_REPORT(reg)    ((reg) + 1)
  98
  99 /* Report 17 gives direct read/write access to the entire Si470x register */
 100 /* map across endpoint 0 using GET_REPORT and SET_REPORT */
 101 #define ENTIRE_REPORT_SIZE      (RADIO_REGISTER_NUM * RADIO_REGISTER_SIZE + 1)
 102 #define ENTIRE_REPORT           17
 103
 104 /* Report 18 is used to send the lowest 6 Si470x registers up the HID */
 105 /* interrupt endpoint 1 to Windows every 20 milliseconds for status */
 106 #define RDS_REPORT_SIZE         (RDS_REGISTER_NUM * RADIO_REGISTER_SIZE + 1)
 107 #define RDS_REPORT              18
 108
 109 /* Report 19: LED state */
 110 #define LED_REPORT_SIZE         3
 111 #define LED_REPORT              19
 112
 113 /* Report 19: stream */
 114 #define STREAM_REPORT_SIZE      3
 115 #define STREAM_REPORT           19
 116
 117 /* Report 20: scratch */
 118 #define SCRATCH_PAGE_SIZE       63
 119 #define SCRATCH_REPORT_SIZE     (SCRATCH_PAGE_SIZE + 1)
 120 #define SCRATCH_REPORT          20
 121
 122 /* Reports 19-22: flash upgrade of the C8051F321 */
 123 #define WRITE_REPORT_SIZE       4
 124 #define WRITE_REPORT            19
 125 #define FLASH_REPORT_SIZE       64
 126 #define FLASH_REPORT            20
 127 #define CRC_REPORT_SIZE         3
 128 #define CRC_REPORT              21
 129 #define RESPONSE_REPORT_SIZE    2
 130 #define RESPONSE_REPORT         22
 131
 132 /* Report 23: currently unused, but can accept 60 byte reports on the HID */
 133 /* interrupt out endpoint 2 every 1 millisecond */
 134 #define UNUSED_REPORT           23
 135
 136 #define MAX_REPORT_SIZE         64
 137
 138
 139
 140 /**************************************************************************
 141  * Software/Hardware Versions from Scratch Page
 142  **************************************************************************/
 143 #define RADIO_HW_VERSION                        1
 144
 145
 146
 147 /**************************************************************************
 148  * LED State Definitions
 149  **************************************************************************/
 150 #define LED_COMMAND             0x35
 151
 152 #define NO_CHANGE_LED           0x00
 153 #define ALL_COLOR_LED           0x01    /* streaming state */
 154 #define BLINK_GREEN_LED         0x02    /* connect state */
 155 #define BLINK_RED_LED           0x04
 156 #define BLINK_ORANGE_LED        0x10    /* disconnect state */
 157 #define SOLID_GREEN_LED         0x20    /* tuning/seeking state */
 158 #define SOLID_RED_LED           0x40    /* bootload state */
 159 #define SOLID_ORANGE_LED        0x80
 160
 161
 162
 163 /**************************************************************************
 164  * Stream State Definitions
 165  **************************************************************************/
 166 #define STREAM_COMMAND  0x36
 167 #define STREAM_VIDPID   0x00
 168 #define STREAM_AUDIO    0xff
 169
 170
 171
 172 /**************************************************************************
 173  * Bootloader / Flash Commands
 174  **************************************************************************/
 175
 176 /* unique id sent to bootloader and required to put into a bootload state */
 177 #define UNIQUE_BL_ID            0x34
 178
 179 /* mask for the flash data */
 180 #define FLASH_DATA_MASK         0x55
 181
 182 /* bootloader commands */
 183 #define GET_SW_VERSION_COMMAND  0x00
 184 #define SET_PAGE_COMMAND        0x01
 185 #define ERASE_PAGE_COMMAND      0x02
 186 #define WRITE_PAGE_COMMAND      0x03
 187 #define CRC_ON_PAGE_COMMAND     0x04
 188 #define READ_FLASH_BYTE_COMMAND 0x05
 189 #define RESET_DEVICE_COMMAND    0x06
 190 #define GET_HW_VERSION_COMMAND  0x07
 191 #define BLANK                   0xff
 192
 193 /* bootloader command responses */
 194 #define COMMAND_OK              0x01
 195 #define COMMAND_FAILED          0x02
 196 #define COMMAND_PENDING         0x03
 197
 198
 199
 200 /**************************************************************************
 201  * General Driver Functions - REGISTER_REPORTs
 202  **************************************************************************/
 203
 204 /*
 205  * si470x_get_report - receive a HID report
 206  */
 207 static int si470x_get_report(struct si470x_device *radio, void *buf, int size)
 208 {
 209         unsigned char *report = buf;
 210         int retval;
 211
 212         retval = usb_control_msg(radio->usbdev,
 213                 usb_rcvctrlpipe(radio->usbdev, 0),
 214                 HID_REQ_GET_REPORT,
 215                 USB_TYPE_CLASS | USB_RECIP_INTERFACE | USB_DIR_IN,
 216                 report[0], 2,
 217                 buf, size, usb_timeout);
 218
 219         if (retval < 0)
 220                 dev_warn(&radio->intf->dev,
 221                         "si470x_get_report: usb_control_msg returned %d\n",
 222                         retval);
 223         return retval;
 224 }
 225
 226
 227 /*
 228  * si470x_set_report - send a HID report
 229  */
 230 static int si470x_set_report(struct si470x_device *radio, void *buf, int size)
 231 {
 232         unsigned char *report = buf;
 233         int retval;
 234
 235         retval = usb_control_msg(radio->usbdev,
 236                 usb_sndctrlpipe(radio->usbdev, 0),
 237                 HID_REQ_SET_REPORT,
 238                 USB_TYPE_CLASS | USB_RECIP_INTERFACE | USB_DIR_OUT,
 239                 report[0], 2,
 240                 buf, size, usb_timeout);
 241
 242         if (retval < 0)
 243                 dev_warn(&radio->intf->dev,
 244                         "si470x_set_report: usb_control_msg returned %d\n",
 245                         retval);
 246         return retval;
 247 }
 248
 249
 250 /*
 251  * si470x_get_register - read register
 252  */
 253 static int si470x_get_register(struct si470x_device *radio, int regnr)
 254 {
 255         int retval;
 256
 257         radio->usb_buf[0] = REGISTER_REPORT(regnr);
 258
 259         retval = si470x_get_report(radio, radio->usb_buf, REGISTER_REPORT_SIZE);
 260
 261         if (retval >= 0)
 262                 radio->registers[regnr] = get_unaligned_be16(&radio->usb_buf[1]);
 263
 264         return (retval < 0) ? -EINVAL : 0;
 265 }
 266
 267
 268 /*
 269  * si470x_set_register - write register
 270  */
 271 static int si470x_set_register(struct si470x_device *radio, int regnr)
 272 {
 273         int retval;
 274
 275         radio->usb_buf[0] = REGISTER_REPORT(regnr);
 276         put_unaligned_be16(radio->registers[regnr], &radio->usb_buf[1]);
 277
 278         retval = si470x_set_report(radio, radio->usb_buf, REGISTER_REPORT_SIZE);
 279
 280         return (retval < 0) ? -EINVAL : 0;
 281 }
 282
 283
 284
 285 /**************************************************************************
 286  * General Driver Functions - ENTIRE_REPORT
 287  **************************************************************************/
 288
 289 /*
 290  * si470x_get_all_registers - read entire registers
 291  */
 292 static int si470x_get_all_registers(struct si470x_device *radio)
 293 {
 294         int retval;
 295         unsigned char regnr;
 296
 297         radio->usb_buf[0] = ENTIRE_REPORT;
 298
 299         retval = si470x_get_report(radio, radio->usb_buf, ENTIRE_REPORT_SIZE);
 300
 301         if (retval >= 0)
 302                 for (regnr = 0; regnr < RADIO_REGISTER_NUM; regnr++)
 303                         radio->registers[regnr] = get_unaligned_be16(
 304                                 &radio->usb_buf[regnr * RADIO_REGISTER_SIZE + 1]);
 305
 306         return (retval < 0) ? -EINVAL : 0;
 307 }
 308
 309
 310
 311 /**************************************************************************
 312  * General Driver Functions - LED_REPORT
 313  **************************************************************************/
 314
 315 /*
 316  * si470x_set_led_state - sets the led state
 317  */
 318 static int si470x_set_led_state(struct si470x_device *radio,
 319                 unsigned char led_state)
 320 {
 321         int retval;
 322
 323         radio->usb_buf[0] = LED_REPORT;
 324         radio->usb_buf[1] = LED_COMMAND;
 325         radio->usb_buf[2] = led_state;
 326
 327         retval = si470x_set_report(radio, radio->usb_buf, LED_REPORT_SIZE);
 328
 329         return (retval < 0) ? -EINVAL : 0;
 330 }
 331
 332
 333
 334 /**************************************************************************
 335  * General Driver Functions - SCRATCH_REPORT
 336  **************************************************************************/
 337
 338 /*
 339  * si470x_get_scratch_versions - gets the scratch page and version infos
 340  */
 341 static int si470x_get_scratch_page_versions(struct si470x_device *radio)
 342 {
 343         int retval;
 344
 345         radio->usb_buf[0] = SCRATCH_REPORT;
 346
 347         retval = si470x_get_report(radio, radio->usb_buf, SCRATCH_REPORT_SIZE);
 348
 349         if (retval < 0)
 350                 dev_warn(&radio->intf->dev, "si470x_get_scratch: si470x_get_report returned %d\n",
 351                          retval);
 352         else {
 353                 radio->software_version = radio->usb_buf[1];
 354                 radio->hardware_version = radio->usb_buf[2];
 355         }
 356
 357         return (retval < 0) ? -EINVAL : 0;
 358 }
 359
 360
 361
 362 /**************************************************************************
 363  * RDS Driver Functions
 364  **************************************************************************/
 365
 366 /*
 367  * si470x_int_in_callback - rds callback and processing function
 368  *
 369  * TODO: do we need to use mutex locks in some sections?
 370  */
 371 static void si470x_int_in_callback(struct urb *urb)
 372 {
 373         struct si470x_device *radio = urb->context;
 374         int retval;
 375         unsigned char regnr;
 376         unsigned char blocknum;
 377         unsigned short bler; /* rds block errors */
 378         unsigned short rds;
 379         unsigned char tmpbuf[3];
 380
 381         if (urb->status) {
 382                 if (urb->status == -ENOENT ||
 383                                 urb->status == -ECONNRESET ||
 384                                 urb->status == -ESHUTDOWN) {
 385                         return;
 386                 } else {
 387                         dev_warn(&radio->intf->dev,
 388                          "non-zero urb status (%d)\n", urb->status);
 389                         goto resubmit; /* Maybe we can recover. */
 390                 }
 391         }
 392
 393         /* Sometimes the device returns len 0 packets */
 394         if (urb->actual_length != RDS_REPORT_SIZE)
 395                 goto resubmit;
 396
 397         radio->registers[STATUSRSSI] =
 398                 get_unaligned_be16(&radio->int_in_buffer[1]);
 399
 400         if (radio->registers[STATUSRSSI] & STATUSRSSI_STC)
 401                 complete(&radio->completion);
 402
 403         if ((radio->registers[SYSCONFIG1] & SYSCONFIG1_RDS)) {
 404                 /* Update RDS registers with URB data */
 405                 for (regnr = 1; regnr < RDS_REGISTER_NUM; regnr++)
 406                         radio->registers[STATUSRSSI + regnr] =
 407                             get_unaligned_be16(&radio->int_in_buffer[
 408                                 regnr * RADIO_REGISTER_SIZE + 1]);
 409                 /* get rds blocks */
 410                 if ((radio->registers[STATUSRSSI] & STATUSRSSI_RDSR) == 0) {
 411                         /* No RDS group ready, better luck next time */
 412                         goto resubmit;
 413                 }
 414                 if ((radio->registers[STATUSRSSI] & STATUSRSSI_RDSS) == 0) {
 415                         /* RDS decoder not synchronized */
 416                         goto resubmit;
 417                 }
 418                 for (blocknum = 0; blocknum < 4; blocknum++) {
 419                         switch (blocknum) {
 420                         default:
 421                                 bler = (radio->registers[STATUSRSSI] &
 422                                                 STATUSRSSI_BLERA) >> 9;
 423                                 rds = radio->registers[RDSA];
 424                                 break;
 425                         case 1:
 426                                 bler = (radio->registers[READCHAN] &
 427                                                 READCHAN_BLERB) >> 14;
 428                                 rds = radio->registers[RDSB];
 429                                 break;
 430                         case 2:
 431                                 bler = (radio->registers[READCHAN] &
 432                                                 READCHAN_BLERC) >> 12;
 433                                 rds = radio->registers[RDSC];
 434                                 break;
 435                         case 3:
 436                                 bler = (radio->registers[READCHAN] &
 437                                                 READCHAN_BLERD) >> 10;
 438                                 rds = radio->registers[RDSD];
 439                                 break;
 440                         }
 441
 442                         /* Fill the V4L2 RDS buffer */
 443                         put_unaligned_le16(rds, &tmpbuf);
 444                         tmpbuf[2] = blocknum;           /* offset name */
 445                         tmpbuf[2] |= blocknum << 3;     /* received offset */
 446                         if (bler > max_rds_errors)
 447                                 tmpbuf[2] |= 0x80; /* uncorrectable errors */
 448                         else if (bler > 0)
 449                                 tmpbuf[2] |= 0x40; /* corrected error(s) */
 450
 451                         /* copy RDS block to internal buffer */
 452                         memcpy(&radio->buffer[radio->wr_index], &tmpbuf, 3);
 453                         radio->wr_index += 3;
 454
 455                         /* wrap write pointer */
 456                         if (radio->wr_index >= radio->buf_size)
 457                                 radio->wr_index = 0;
 458
 459                         /* check for overflow */
 460                         if (radio->wr_index == radio->rd_index) {
 461                                 /* increment and wrap read pointer */
 462                                 radio->rd_index += 3;
 463                                 if (radio->rd_index >= radio->buf_size)
 464                                         radio->rd_index = 0;
 465                         }
 466                 }
 467                 if (radio->wr_index != radio->rd_index)
 468                         wake_up_interruptible(&radio->read_queue);
 469         }
 470
 471 resubmit:
 472         /* Resubmit if we're still running. */
 473         if (radio->int_in_running && radio->usbdev) {
 474                 retval = usb_submit_urb(radio->int_in_urb, GFP_ATOMIC);
 475                 if (retval) {
 476                         dev_warn(&radio->intf->dev,
 477                                "resubmitting urb failed (%d)", retval);
 478                         radio->int_in_running = 0;
 479                 }
 480         }
 481         radio->status_rssi_auto_update = radio->int_in_running;
 482 }
 483
 484
 485 static int si470x_fops_open(struct file *file)
 486 {
 487         return v4l2_fh_open(file);
 488 }
 489
 490 static int si470x_fops_release(struct file *file)
 491 {
 492         return v4l2_fh_release(file);
 493 }
 494
 495 static void si470x_usb_release(struct v4l2_device *v4l2_dev)
 496 {
 497         struct si470x_device *radio =
 498                 container_of(v4l2_dev, struct si470x_device, v4l2_dev);
 499
 500         usb_free_urb(radio->int_in_urb);
 501         v4l2_ctrl_handler_free(&radio->hdl);
 502         v4l2_device_unregister(&radio->v4l2_dev);
 503         kfree(radio->int_in_buffer);
 504         kfree(radio->buffer);
 505         kfree(radio->usb_buf);
 506         kfree(radio);
 507 }
 508
 509
 510 /**************************************************************************
 511  * Video4Linux Interface
 512  **************************************************************************/
 513
 514 /*
 515  * si470x_vidioc_querycap - query device capabilities
 516  */
 517 static int si470x_vidioc_querycap(struct file *file, void *priv,
 518                                   struct v4l2_capability *capability)
 519 {
 520         struct si470x_device *radio = video_drvdata(file);
 521
 522         strscpy(capability->driver, DRIVER_NAME, sizeof(capability->driver));
 523         strscpy(capability->card, DRIVER_CARD, sizeof(capability->card));
 524         usb_make_path(radio->usbdev, capability->bus_info,
 525                         sizeof(capability->bus_info));
 526         capability->device_caps = V4L2_CAP_HW_FREQ_SEEK | V4L2_CAP_READWRITE |
 527                 V4L2_CAP_TUNER | V4L2_CAP_RADIO | V4L2_CAP_RDS_CAPTURE;
 528         capability->capabilities = capability->device_caps | V4L2_CAP_DEVICE_CAPS;
 529         return 0;
 530 }
 531
 532
 533 static int si470x_start_usb(struct si470x_device *radio)
 534 {
 535         int retval;
 536
 537         /* initialize interrupt urb */
 538         usb_fill_int_urb(radio->int_in_urb, radio->usbdev,
 539                         usb_rcvintpipe(radio->usbdev,
 540                                 radio->int_in_endpoint->bEndpointAddress),
 541                         radio->int_in_buffer,
 542                         le16_to_cpu(radio->int_in_endpoint->wMaxPacketSize),
 543                         si470x_int_in_callback,
 544                         radio,
 545                         radio->int_in_endpoint->bInterval);
 546
 547         radio->int_in_running = 1;
 548         mb();
 549
 550         retval = usb_submit_urb(radio->int_in_urb, GFP_KERNEL);
 551         if (retval) {
 552                 dev_info(&radio->intf->dev,
 553                                 "submitting int urb failed (%d)\n", retval);
 554                 radio->int_in_running = 0;
 555         }
 556         radio->status_rssi_auto_update = radio->int_in_running;
 557
 558         /* start radio */
 559         retval = si470x_start(radio);
 560         if (retval < 0)
 561                 return retval;
 562
 563         v4l2_ctrl_handler_setup(&radio->hdl);
 564
 565         return retval;
 566 }
 567
 568 /**************************************************************************
 569  * USB Interface
 570  **************************************************************************/
 571
 572 /*
 573  * si470x_usb_driver_probe - probe for the device
 574  */
 575 static int si470x_usb_driver_probe(struct usb_interface *intf,
 576                 const struct usb_device_id *id)
 577 {
 578         struct si470x_device *radio;
 579         struct usb_host_interface *iface_desc;
 580         struct usb_endpoint_descriptor *endpoint;
 581         int i, int_end_size, retval;
 582         unsigned char version_warning = 0;
 583
 584         /* private data allocation and initialization */
 585         radio = kzalloc(sizeof(struct si470x_device), GFP_KERNEL);
 586         if (!radio) {
 587                 retval = -ENOMEM;
 588                 goto err_initial;
 589         }
 590         radio->usb_buf = kmalloc(MAX_REPORT_SIZE, GFP_KERNEL);
 591         if (radio->usb_buf == NULL) {
 592                 retval = -ENOMEM;
 593                 goto err_radio;
 594         }
 595         radio->usbdev = interface_to_usbdev(intf);
 596         radio->intf = intf;
 597         radio->band = 1; /* Default to 76 - 108 MHz */
 598         mutex_init(&radio->lock);
 599         init_completion(&radio->completion);
 600
 601         radio->get_register = si470x_get_register;
 602         radio->set_register = si470x_set_register;
 603         radio->fops_open = si470x_fops_open;
 604         radio->fops_release = si470x_fops_release;
 605         radio->vidioc_querycap = si470x_vidioc_querycap;
 606
 607         iface_desc = intf->cur_altsetting;
 608
 609         /* Set up interrupt endpoint information. */
 610         for (i = 0; i < iface_desc->desc.bNumEndpoints; ++i) {
 611                 endpoint = &iface_desc->endpoint[i].desc;
 612                 if (usb_endpoint_is_int_in(endpoint))
 613                         radio->int_in_endpoint = endpoint;
 614         }
 615         if (!radio->int_in_endpoint) {
 616                 dev_info(&intf->dev, "could not find interrupt in endpoint\n");
 617                 retval = -EIO;
 618                 goto err_usbbuf;
 619         }
 620
 621         int_end_size = le16_to_cpu(radio->int_in_endpoint->wMaxPacketSize);
 622
 623         radio->int_in_buffer = kmalloc(int_end_size, GFP_KERNEL);
 624         if (!radio->int_in_buffer) {
 625                 dev_info(&intf->dev, "could not allocate int_in_buffer");
 626                 retval = -ENOMEM;
 627                 goto err_usbbuf;
 628         }
 629
 630         radio->int_in_urb = usb_alloc_urb(0, GFP_KERNEL);
 631         if (!radio->int_in_urb) {
 632                 retval = -ENOMEM;
 633                 goto err_intbuffer;
 634         }
 635
 636         radio->v4l2_dev.release = si470x_usb_release;
 637
 638         /*
 639          * The si470x SiLabs reference design uses the same USB IDs as
 640          * 'Thanko's Raremono' si4734 based receiver. So check here which we
 641          * have: attempt to read the device ID from the si470x: the lower 12
 642          * bits should be 0x0242 for the si470x.
 643          *
 644          * We use this check to determine which device we are dealing with.
 645          */
 646         if (id->idVendor == 0x10c4 && id->idProduct == 0x818a) {
 647                 retval = usb_control_msg(radio->usbdev,
 648                                 usb_rcvctrlpipe(radio->usbdev, 0),
 649                                 HID_REQ_GET_REPORT,
 650                                 USB_TYPE_CLASS | USB_RECIP_INTERFACE | USB_DIR_IN,
 651                                 1, 2,
 652                                 radio->usb_buf, 3, 500);
 653                 if (retval != 3 ||
 654                     (get_unaligned_be16(&radio->usb_buf[1]) & 0xfff) != 0x0242) {
 655                         dev_info(&intf->dev, "this is not a si470x device.\n");
 656                         retval = -ENODEV;
 657                         goto err_urb;
 658                 }
 659         }
 660
 661         retval = v4l2_device_register(&intf->dev, &radio->v4l2_dev);
 662         if (retval < 0) {
 663                 dev_err(&intf->dev, "couldn't register v4l2_device\n");
 664                 goto err_urb;
 665         }
 666
 667         v4l2_ctrl_handler_init(&radio->hdl, 2);
 668         v4l2_ctrl_new_std(&radio->hdl, &si470x_ctrl_ops,
 669                           V4L2_CID_AUDIO_MUTE, 0, 1, 1, 1);
 670         v4l2_ctrl_new_std(&radio->hdl, &si470x_ctrl_ops,
 671                           V4L2_CID_AUDIO_VOLUME, 0, 15, 1, 15);
 672         if (radio->hdl.error) {
 673                 retval = radio->hdl.error;
 674                 dev_err(&intf->dev, "couldn't register control\n");
 675                 goto err_dev;
 676         }
 677         radio->videodev = si470x_viddev_template;
 678         radio->videodev.ctrl_handler = &radio->hdl;
 679         radio->videodev.lock = &radio->lock;
 680         radio->videodev.v4l2_dev = &radio->v4l2_dev;
 681         radio->videodev.release = video_device_release_empty;
 682         video_set_drvdata(&radio->videodev, radio);
 683
 684         /* get device and chip versions */
 685         if (si470x_get_all_registers(radio) < 0) {
 686                 retval = -EIO;
 687                 goto err_ctrl;
 688         }
 689         dev_info(&intf->dev, "DeviceID=0x%4.4hx ChipID=0x%4.4hx\n",
 690                         radio->registers[DEVICEID], radio->registers[SI_CHIPID]);
 691         if ((radio->registers[SI_CHIPID] & SI_CHIPID_FIRMWARE) < RADIO_FW_VERSION) {
 692                 dev_warn(&intf->dev,
 693                         "This driver is known to work with firmware version %hu,\n",
 694                         RADIO_FW_VERSION);
 695                 dev_warn(&intf->dev,
 696                         "but the device has firmware version %hu.\n",
 697                         radio->registers[SI_CHIPID] & SI_CHIPID_FIRMWARE);
 698                 version_warning = 1;
 699         }
 700
 701         /* get software and hardware versions */
 702         if (si470x_get_scratch_page_versions(radio) < 0) {
 703                 retval = -EIO;
 704                 goto err_ctrl;
 705         }
 706         dev_info(&intf->dev, "software version %d, hardware version %d\n",
 707                         radio->software_version, radio->hardware_version);
 708         if (radio->hardware_version < RADIO_HW_VERSION) {
 709                 dev_warn(&intf->dev,
 710                         "This driver is known to work with hardware version %hu,\n",
 711                         RADIO_HW_VERSION);
 712                 dev_warn(&intf->dev,
 713                         "but the device has hardware version %hu.\n",
 714                         radio->hardware_version);
 715                 version_warning = 1;
 716         }
 717
 718         /* give out version warning */
 719         if (version_warning == 1) {
 720                 dev_warn(&intf->dev,
 721                         "If you have some trouble using this driver,\n");
 722                 dev_warn(&intf->dev,
 723                         "please report to V4L ML at linux-media@vger.kernel.org\n");
 724         }
 725
 726         /* set led to connect state */
 727         si470x_set_led_state(radio, BLINK_GREEN_LED);
 728
 729         /* rds buffer allocation */
 730         radio->buf_size = rds_buf * 3;
 731         radio->buffer = kmalloc(radio->buf_size, GFP_KERNEL);
 732         if (!radio->buffer) {
 733                 retval = -EIO;
 734                 goto err_ctrl;
 735         }
 736
 737         /* rds buffer configuration */
 738         radio->wr_index = 0;
 739         radio->rd_index = 0;
 740         init_waitqueue_head(&radio->read_queue);
 741         usb_set_intfdata(intf, radio);
 742
 743         /* start radio */
 744         retval = si470x_start_usb(radio);
 745         if (retval < 0)
 746                 goto err_all;
 747
 748         /* set initial frequency */
 749         si470x_set_freq(radio, 87.5 * FREQ_MUL); /* available in all regions */
 750
 751         /* register video device */
 752         retval = video_register_device(&radio->videodev, VFL_TYPE_RADIO,
 753                         radio_nr);
 754         if (retval) {
 755                 dev_err(&intf->dev, "Could not register video device\n");
 756                 goto err_all;
 757         }
 758
 759         return 0;
 760 err_all:
 761         kfree(radio->buffer);
 762 err_ctrl:
 763         v4l2_ctrl_handler_free(&radio->hdl);
 764 err_dev:
 765         v4l2_device_unregister(&radio->v4l2_dev);
 766 err_urb:
 767         usb_free_urb(radio->int_in_urb);
 768 err_intbuffer:
 769         kfree(radio->int_in_buffer);
 770 err_usbbuf:
 771         kfree(radio->usb_buf);
 772 err_radio:
 773         kfree(radio);
 774 err_initial:
 775         return retval;
 776 }
 777
 778
 779 /*
 780  * si470x_usb_driver_suspend - suspend the device
 781  */
 782 static int si470x_usb_driver_suspend(struct usb_interface *intf,
 783                 pm_message_t message)
 784 {
 785         struct si470x_device *radio = usb_get_intfdata(intf);
 786
 787         dev_info(&intf->dev, "suspending now...\n");
 788
 789         /* shutdown interrupt handler */
 790         if (radio->int_in_running) {
 791                 radio->int_in_running = 0;
 792                 if (radio->int_in_urb)
 793                         usb_kill_urb(radio->int_in_urb);
 794         }
 795
 796         /* cancel read processes */
 797         wake_up_interruptible(&radio->read_queue);
 798
 799         /* stop radio */
 800         si470x_stop(radio);
 801         return 0;
 802 }
 803
 804
 805 /*
 806  * si470x_usb_driver_resume - resume the device
 807  */
 808 static int si470x_usb_driver_resume(struct usb_interface *intf)
 809 {
 810         struct si470x_device *radio = usb_get_intfdata(intf);
 811         int ret;
 812
 813         dev_info(&intf->dev, "resuming now...\n");
 814
 815         /* start radio */
 816         ret = si470x_start_usb(radio);
 817         if (ret == 0)
 818                 v4l2_ctrl_handler_setup(&radio->hdl);
 819
 820         return ret;
 821 }
 822
 823
 824 /*
 825  * si470x_usb_driver_disconnect - disconnect the device
 826  */
 827 static void si470x_usb_driver_disconnect(struct usb_interface *intf)
 828 {
 829         struct si470x_device *radio = usb_get_intfdata(intf);
 830
 831         mutex_lock(&radio->lock);
 832         v4l2_device_disconnect(&radio->v4l2_dev);
 833         video_unregister_device(&radio->videodev);
 834         usb_set_intfdata(intf, NULL);
 835         mutex_unlock(&radio->lock);
 836         v4l2_device_put(&radio->v4l2_dev);
 837 }
 838
 839
 840 /*
 841  * si470x_usb_driver - usb driver interface
 842  *
 843  * A note on suspend/resume: this driver had only empty suspend/resume
 844  * functions, and when I tried to test suspend/resume it always disconnected
 845  * instead of resuming (using my ADS InstantFM stick). So I've decided to
 846  * remove these callbacks until someone else with better hardware can
 847  * implement and test this.
 848  */
 849 static struct usb_driver si470x_usb_driver = {
 850         .name                   = DRIVER_NAME,
 851         .probe                  = si470x_usb_driver_probe,
 852         .disconnect             = si470x_usb_driver_disconnect,
 853         .suspend                = si470x_usb_driver_suspend,
 854         .resume                 = si470x_usb_driver_resume,
 855         .reset_resume           = si470x_usb_driver_resume,
 856         .id_table               = si470x_usb_driver_id_table,
 857 };
 858
 859 module_usb_driver(si470x_usb_driver);
 860
 861 MODULE_LICENSE("GPL");
 862 MODULE_AUTHOR(DRIVER_AUTHOR);
 863 MODULE_DESCRIPTION(DRIVER_DESC);
 864 MODULE_VERSION(DRIVER_VERSION);