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  * You should have received a copy of the GNU General Public License
  19  * along with this program; if not, write to the Free Software
  20  * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
  21  */
  22
  23
  24 /*
  25  * ToDo:
  26  * - add firmware download/update support
  27  */
  28
  29
  30 /* driver definitions */
  31 #define DRIVER_AUTHOR "Tobias Lorenz <tobias.lorenz@gmx.net>"
  32 #define DRIVER_CARD "Silicon Labs Si470x FM Radio Receiver"
  33 #define DRIVER_DESC "USB radio driver for Si470x FM Radio Receivers"
  34 #define DRIVER_VERSION "1.0.10"
  35
  36 /* kernel includes */
  37 #include <linux/usb.h>
  38 #include <linux/hid.h>
  39 #include <linux/slab.h>
  40
  41 #include "radio-si470x.h"
  42
  43
  44 /* USB Device ID List */
  45 static struct usb_device_id si470x_usb_driver_id_table[] = {
  46         /* Silicon Labs USB FM Radio Reference Design */
  47         { USB_DEVICE_AND_INTERFACE_INFO(0x10c4, 0x818a, USB_CLASS_HID, 0, 0) },
  48         /* ADS/Tech FM Radio Receiver (formerly Instant FM Music) */
  49         { USB_DEVICE_AND_INTERFACE_INFO(0x06e1, 0xa155, USB_CLASS_HID, 0, 0) },
  50         /* KWorld USB FM Radio SnapMusic Mobile 700 (FM700) */
  51         { USB_DEVICE_AND_INTERFACE_INFO(0x1b80, 0xd700, USB_CLASS_HID, 0, 0) },
  52         /* Sanei Electric, Inc. FM USB Radio (sold as DealExtreme.com PCear) */
  53         { USB_DEVICE_AND_INTERFACE_INFO(0x10c5, 0x819a, USB_CLASS_HID, 0, 0) },
  54         /* Axentia ALERT FM USB Receiver */
  55         { USB_DEVICE_AND_INTERFACE_INFO(0x12cf, 0x7111, USB_CLASS_HID, 0, 0) },
  56         /* Terminating entry */
  57         { }
  58 };
  59 MODULE_DEVICE_TABLE(usb, si470x_usb_driver_id_table);
  60
  61
  62
  63 /**************************************************************************
  64  * Module Parameters
  65  **************************************************************************/
  66
  67 /* Radio Nr */
  68 static int radio_nr = -1;
  69 module_param(radio_nr, int, 0444);
  70 MODULE_PARM_DESC(radio_nr, "Radio Nr");
  71
  72 /* USB timeout */
  73 static unsigned int usb_timeout = 500;
  74 module_param(usb_timeout, uint, 0644);
  75 MODULE_PARM_DESC(usb_timeout, "USB timeout (ms): *500*");
  76
  77 /* RDS buffer blocks */
  78 static unsigned int rds_buf = 100;
  79 module_param(rds_buf, uint, 0444);
  80 MODULE_PARM_DESC(rds_buf, "RDS buffer entries: *100*");
  81
  82 /* RDS maximum block errors */
  83 static unsigned short max_rds_errors = 1;
  84 /* 0 means   0  errors requiring correction */
  85 /* 1 means 1-2  errors requiring correction (used by original USBRadio.exe) */
  86 /* 2 means 3-5  errors requiring correction */
  87 /* 3 means   6+ errors or errors in checkword, correction not possible */
  88 module_param(max_rds_errors, ushort, 0644);
  89 MODULE_PARM_DESC(max_rds_errors, "RDS maximum block errors: *1*");
  90
  91
  92
  93 /**************************************************************************
  94  * USB HID Reports
  95  **************************************************************************/
  96
  97 /* Reports 1-16 give direct read/write access to the 16 Si470x registers */
  98 /* with the (REPORT_ID - 1) corresponding to the register address across USB */
  99 /* endpoint 0 using GET_REPORT and SET_REPORT */
 100 #define REGISTER_REPORT_SIZE    (RADIO_REGISTER_SIZE + 1)
 101 #define REGISTER_REPORT(reg)    ((reg) + 1)
 102
 103 /* Report 17 gives direct read/write access to the entire Si470x register */
 104 /* map across endpoint 0 using GET_REPORT and SET_REPORT */
 105 #define ENTIRE_REPORT_SIZE      (RADIO_REGISTER_NUM * RADIO_REGISTER_SIZE + 1)
 106 #define ENTIRE_REPORT           17
 107
 108 /* Report 18 is used to send the lowest 6 Si470x registers up the HID */
 109 /* interrupt endpoint 1 to Windows every 20 milliseconds for status */
 110 #define RDS_REPORT_SIZE         (RDS_REGISTER_NUM * RADIO_REGISTER_SIZE + 1)
 111 #define RDS_REPORT              18
 112
 113 /* Report 19: LED state */
 114 #define LED_REPORT_SIZE         3
 115 #define LED_REPORT              19
 116
 117 /* Report 19: stream */
 118 #define STREAM_REPORT_SIZE      3
 119 #define STREAM_REPORT           19
 120
 121 /* Report 20: scratch */
 122 #define SCRATCH_PAGE_SIZE       63
 123 #define SCRATCH_REPORT_SIZE     (SCRATCH_PAGE_SIZE + 1)
 124 #define SCRATCH_REPORT          20
 125
 126 /* Reports 19-22: flash upgrade of the C8051F321 */
 127 #define WRITE_REPORT_SIZE       4
 128 #define WRITE_REPORT            19
 129 #define FLASH_REPORT_SIZE       64
 130 #define FLASH_REPORT            20
 131 #define CRC_REPORT_SIZE         3
 132 #define CRC_REPORT              21
 133 #define RESPONSE_REPORT_SIZE    2
 134 #define RESPONSE_REPORT         22
 135
 136 /* Report 23: currently unused, but can accept 60 byte reports on the HID */
 137 /* interrupt out endpoint 2 every 1 millisecond */
 138 #define UNUSED_REPORT           23
 139
 140 #define MAX_REPORT_SIZE         64
 141
 142
 143
 144 /**************************************************************************
 145  * Software/Hardware Versions from Scratch Page
 146  **************************************************************************/
 147 #define RADIO_HW_VERSION                        1
 148
 149
 150
 151 /**************************************************************************
 152  * LED State Definitions
 153  **************************************************************************/
 154 #define LED_COMMAND             0x35
 155
 156 #define NO_CHANGE_LED           0x00
 157 #define ALL_COLOR_LED           0x01    /* streaming state */
 158 #define BLINK_GREEN_LED         0x02    /* connect state */
 159 #define BLINK_RED_LED           0x04
 160 #define BLINK_ORANGE_LED        0x10    /* disconnect state */
 161 #define SOLID_GREEN_LED         0x20    /* tuning/seeking state */
 162 #define SOLID_RED_LED           0x40    /* bootload state */
 163 #define SOLID_ORANGE_LED        0x80
 164
 165
 166
 167 /**************************************************************************
 168  * Stream State Definitions
 169  **************************************************************************/
 170 #define STREAM_COMMAND  0x36
 171 #define STREAM_VIDPID   0x00
 172 #define STREAM_AUDIO    0xff
 173
 174
 175
 176 /**************************************************************************
 177  * Bootloader / Flash Commands
 178  **************************************************************************/
 179
 180 /* unique id sent to bootloader and required to put into a bootload state */
 181 #define UNIQUE_BL_ID            0x34
 182
 183 /* mask for the flash data */
 184 #define FLASH_DATA_MASK         0x55
 185
 186 /* bootloader commands */
 187 #define GET_SW_VERSION_COMMAND  0x00
 188 #define SET_PAGE_COMMAND        0x01
 189 #define ERASE_PAGE_COMMAND      0x02
 190 #define WRITE_PAGE_COMMAND      0x03
 191 #define CRC_ON_PAGE_COMMAND     0x04
 192 #define READ_FLASH_BYTE_COMMAND 0x05
 193 #define RESET_DEVICE_COMMAND    0x06
 194 #define GET_HW_VERSION_COMMAND  0x07
 195 #define BLANK                   0xff
 196
 197 /* bootloader command responses */
 198 #define COMMAND_OK              0x01
 199 #define COMMAND_FAILED          0x02
 200 #define COMMAND_PENDING         0x03
 201
 202
 203
 204 /**************************************************************************
 205  * General Driver Functions - REGISTER_REPORTs
 206  **************************************************************************/
 207
 208 /*
 209  * si470x_get_report - receive a HID report
 210  */
 211 static int si470x_get_report(struct si470x_device *radio, void *buf, int size)
 212 {
 213         unsigned char *report = buf;
 214         int retval;
 215
 216         retval = usb_control_msg(radio->usbdev,
 217                 usb_rcvctrlpipe(radio->usbdev, 0),
 218                 HID_REQ_GET_REPORT,
 219                 USB_TYPE_CLASS | USB_RECIP_INTERFACE | USB_DIR_IN,
 220                 report[0], 2,
 221                 buf, size, usb_timeout);
 222
 223         if (retval < 0)
 224                 dev_warn(&radio->intf->dev,
 225                         "si470x_get_report: usb_control_msg returned %d\n",
 226                         retval);
 227         return retval;
 228 }
 229
 230
 231 /*
 232  * si470x_set_report - send a HID report
 233  */
 234 static int si470x_set_report(struct si470x_device *radio, void *buf, int size)
 235 {
 236         unsigned char *report = buf;
 237         int retval;
 238
 239         retval = usb_control_msg(radio->usbdev,
 240                 usb_sndctrlpipe(radio->usbdev, 0),
 241                 HID_REQ_SET_REPORT,
 242                 USB_TYPE_CLASS | USB_RECIP_INTERFACE | USB_DIR_OUT,
 243                 report[0], 2,
 244                 buf, size, usb_timeout);
 245
 246         if (retval < 0)
 247                 dev_warn(&radio->intf->dev,
 248                         "si470x_set_report: usb_control_msg returned %d\n",
 249                         retval);
 250         return retval;
 251 }
 252
 253
 254 /*
 255  * si470x_get_register - read register
 256  */
 257 int si470x_get_register(struct si470x_device *radio, int regnr)
 258 {
 259         int retval;
 260
 261         radio->usb_buf[0] = REGISTER_REPORT(regnr);
 262
 263         retval = si470x_get_report(radio, radio->usb_buf, REGISTER_REPORT_SIZE);
 264
 265         if (retval >= 0)
 266                 radio->registers[regnr] = get_unaligned_be16(&radio->usb_buf[1]);
 267
 268         return (retval < 0) ? -EINVAL : 0;
 269 }
 270
 271
 272 /*
 273  * si470x_set_register - write register
 274  */
 275 int si470x_set_register(struct si470x_device *radio, int regnr)
 276 {
 277         int retval;
 278
 279         radio->usb_buf[0] = REGISTER_REPORT(regnr);
 280         put_unaligned_be16(radio->registers[regnr], &radio->usb_buf[1]);
 281
 282         retval = si470x_set_report(radio, radio->usb_buf, REGISTER_REPORT_SIZE);
 283
 284         return (retval < 0) ? -EINVAL : 0;
 285 }
 286
 287
 288
 289 /**************************************************************************
 290  * General Driver Functions - ENTIRE_REPORT
 291  **************************************************************************/
 292
 293 /*
 294  * si470x_get_all_registers - read entire registers
 295  */
 296 static int si470x_get_all_registers(struct si470x_device *radio)
 297 {
 298         int retval;
 299         unsigned char regnr;
 300
 301         radio->usb_buf[0] = ENTIRE_REPORT;
 302
 303         retval = si470x_get_report(radio, radio->usb_buf, ENTIRE_REPORT_SIZE);
 304
 305         if (retval >= 0)
 306                 for (regnr = 0; regnr < RADIO_REGISTER_NUM; regnr++)
 307                         radio->registers[regnr] = get_unaligned_be16(
 308                                 &radio->usb_buf[regnr * RADIO_REGISTER_SIZE + 1]);
 309
 310         return (retval < 0) ? -EINVAL : 0;
 311 }
 312
 313
 314
 315 /**************************************************************************
 316  * General Driver Functions - LED_REPORT
 317  **************************************************************************/
 318
 319 /*
 320  * si470x_set_led_state - sets the led state
 321  */
 322 static int si470x_set_led_state(struct si470x_device *radio,
 323                 unsigned char led_state)
 324 {
 325         int retval;
 326
 327         radio->usb_buf[0] = LED_REPORT;
 328         radio->usb_buf[1] = LED_COMMAND;
 329         radio->usb_buf[2] = led_state;
 330
 331         retval = si470x_set_report(radio, radio->usb_buf, LED_REPORT_SIZE);
 332
 333         return (retval < 0) ? -EINVAL : 0;
 334 }
 335
 336
 337
 338 /**************************************************************************
 339  * General Driver Functions - SCRATCH_REPORT
 340  **************************************************************************/
 341
 342 /*
 343  * si470x_get_scratch_versions - gets the scratch page and version infos
 344  */
 345 static int si470x_get_scratch_page_versions(struct si470x_device *radio)
 346 {
 347         int retval;
 348
 349         radio->usb_buf[0] = SCRATCH_REPORT;
 350
 351         retval = si470x_get_report(radio, radio->usb_buf, SCRATCH_REPORT_SIZE);
 352
 353         if (retval < 0)
 354                 dev_warn(&radio->intf->dev, "si470x_get_scratch: "
 355                         "si470x_get_report returned %d\n", retval);
 356         else {
 357                 radio->software_version = radio->usb_buf[1];
 358                 radio->hardware_version = radio->usb_buf[2];
 359         }
 360
 361         return (retval < 0) ? -EINVAL : 0;
 362 }
 363
 364
 365
 366 /**************************************************************************
 367  * RDS Driver Functions
 368  **************************************************************************/
 369
 370 /*
 371  * si470x_int_in_callback - rds callback and processing function
 372  *
 373  * TODO: do we need to use mutex locks in some sections?
 374  */
 375 static void si470x_int_in_callback(struct urb *urb)
 376 {
 377         struct si470x_device *radio = urb->context;
 378         int retval;
 379         unsigned char regnr;
 380         unsigned char blocknum;
 381         unsigned short bler; /* rds block errors */
 382         unsigned short rds;
 383         unsigned char tmpbuf[3];
 384
 385         if (urb->status) {
 386                 if (urb->status == -ENOENT ||
 387                                 urb->status == -ECONNRESET ||
 388                                 urb->status == -ESHUTDOWN) {
 389                         return;
 390                 } else {
 391                         dev_warn(&radio->intf->dev,
 392                          "non-zero urb status (%d)\n", urb->status);
 393                         goto resubmit; /* Maybe we can recover. */
 394                 }
 395         }
 396
 397         /* Sometimes the device returns len 0 packets */
 398         if (urb->actual_length != RDS_REPORT_SIZE)
 399                 goto resubmit;
 400
 401         radio->registers[STATUSRSSI] =
 402                 get_unaligned_be16(&radio->int_in_buffer[1]);
 403
 404         if (radio->registers[STATUSRSSI] & STATUSRSSI_STC)
 405                 complete(&radio->completion);
 406
 407         if ((radio->registers[SYSCONFIG1] & SYSCONFIG1_RDS)) {
 408                 /* Update RDS registers with URB data */
 409                 for (regnr = 1; regnr < RDS_REGISTER_NUM; regnr++)
 410                         radio->registers[STATUSRSSI + regnr] =
 411                             get_unaligned_be16(&radio->int_in_buffer[
 412                                 regnr * RADIO_REGISTER_SIZE + 1]);
 413                 /* get rds blocks */
 414                 if ((radio->registers[STATUSRSSI] & STATUSRSSI_RDSR) == 0) {
 415                         /* No RDS group ready, better luck next time */
 416                         goto resubmit;
 417                 }
 418                 if ((radio->registers[STATUSRSSI] & STATUSRSSI_RDSS) == 0) {
 419                         /* RDS decoder not synchronized */
 420                         goto resubmit;
 421                 }
 422                 for (blocknum = 0; blocknum < 4; blocknum++) {
 423                         switch (blocknum) {
 424                         default:
 425                                 bler = (radio->registers[STATUSRSSI] &
 426                                                 STATUSRSSI_BLERA) >> 9;
 427                                 rds = radio->registers[RDSA];
 428                                 break;
 429                         case 1:
 430                                 bler = (radio->registers[READCHAN] &
 431                                                 READCHAN_BLERB) >> 14;
 432                                 rds = radio->registers[RDSB];
 433                                 break;
 434                         case 2:
 435                                 bler = (radio->registers[READCHAN] &
 436                                                 READCHAN_BLERC) >> 12;
 437                                 rds = radio->registers[RDSC];
 438                                 break;
 439                         case 3:
 440                                 bler = (radio->registers[READCHAN] &
 441                                                 READCHAN_BLERD) >> 10;
 442                                 rds = radio->registers[RDSD];
 443                                 break;
 444                         }
 445
 446                         /* Fill the V4L2 RDS buffer */
 447                         put_unaligned_le16(rds, &tmpbuf);
 448                         tmpbuf[2] = blocknum;           /* offset name */
 449                         tmpbuf[2] |= blocknum << 3;     /* received offset */
 450                         if (bler > max_rds_errors)
 451                                 tmpbuf[2] |= 0x80; /* uncorrectable errors */
 452                         else if (bler > 0)
 453                                 tmpbuf[2] |= 0x40; /* corrected error(s) */
 454
 455                         /* copy RDS block to internal buffer */
 456                         memcpy(&radio->buffer[radio->wr_index], &tmpbuf, 3);
 457                         radio->wr_index += 3;
 458
 459                         /* wrap write pointer */
 460                         if (radio->wr_index >= radio->buf_size)
 461                                 radio->wr_index = 0;
 462
 463                         /* check for overflow */
 464                         if (radio->wr_index == radio->rd_index) {
 465                                 /* increment and wrap read pointer */
 466                                 radio->rd_index += 3;
 467                                 if (radio->rd_index >= radio->buf_size)
 468                                         radio->rd_index = 0;
 469                         }
 470                 }
 471                 if (radio->wr_index != radio->rd_index)
 472                         wake_up_interruptible(&radio->read_queue);
 473         }
 474
 475 resubmit:
 476         /* Resubmit if we're still running. */
 477         if (radio->int_in_running && radio->usbdev) {
 478                 retval = usb_submit_urb(radio->int_in_urb, GFP_ATOMIC);
 479                 if (retval) {
 480                         dev_warn(&radio->intf->dev,
 481                                "resubmitting urb failed (%d)", retval);
 482                         radio->int_in_running = 0;
 483                 }
 484         }
 485         radio->status_rssi_auto_update = radio->int_in_running;
 486 }
 487
 488
 489 int si470x_fops_open(struct file *file)
 490 {
 491         return v4l2_fh_open(file);
 492 }
 493
 494 int si470x_fops_release(struct file *file)
 495 {
 496         return v4l2_fh_release(file);
 497 }
 498
 499 static void si470x_usb_release(struct v4l2_device *v4l2_dev)
 500 {
 501         struct si470x_device *radio =
 502                 container_of(v4l2_dev, struct si470x_device, v4l2_dev);
 503
 504         usb_free_urb(radio->int_in_urb);
 505         v4l2_ctrl_handler_free(&radio->hdl);
 506         v4l2_device_unregister(&radio->v4l2_dev);
 507         kfree(radio->int_in_buffer);
 508         kfree(radio->buffer);
 509         kfree(radio->usb_buf);
 510         kfree(radio);
 511 }
 512
 513
 514 /**************************************************************************
 515  * Video4Linux Interface
 516  **************************************************************************/
 517
 518 /*
 519  * si470x_vidioc_querycap - query device capabilities
 520  */
 521 int si470x_vidioc_querycap(struct file *file, void *priv,
 522                 struct v4l2_capability *capability)
 523 {
 524         struct si470x_device *radio = video_drvdata(file);
 525
 526         strlcpy(capability->driver, DRIVER_NAME, sizeof(capability->driver));
 527         strlcpy(capability->card, DRIVER_CARD, sizeof(capability->card));
 528         usb_make_path(radio->usbdev, capability->bus_info,
 529                         sizeof(capability->bus_info));
 530         capability->device_caps = V4L2_CAP_HW_FREQ_SEEK | V4L2_CAP_READWRITE |
 531                 V4L2_CAP_TUNER | V4L2_CAP_RADIO | V4L2_CAP_RDS_CAPTURE;
 532         capability->capabilities = capability->device_caps | V4L2_CAP_DEVICE_CAPS;
 533         return 0;
 534 }
 535
 536
 537 static int si470x_start_usb(struct si470x_device *radio)
 538 {
 539         int retval;
 540
 541         /* initialize interrupt urb */
 542         usb_fill_int_urb(radio->int_in_urb, radio->usbdev,
 543                         usb_rcvintpipe(radio->usbdev,
 544                                 radio->int_in_endpoint->bEndpointAddress),
 545                         radio->int_in_buffer,
 546                         le16_to_cpu(radio->int_in_endpoint->wMaxPacketSize),
 547                         si470x_int_in_callback,
 548                         radio,
 549                         radio->int_in_endpoint->bInterval);
 550
 551         radio->int_in_running = 1;
 552         mb();
 553
 554         retval = usb_submit_urb(radio->int_in_urb, GFP_KERNEL);
 555         if (retval) {
 556                 dev_info(&radio->intf->dev,
 557                                 "submitting int urb failed (%d)\n", retval);
 558                 radio->int_in_running = 0;
 559         }
 560         radio->status_rssi_auto_update = radio->int_in_running;
 561
 562         /* start radio */
 563         retval = si470x_start(radio);
 564         if (retval < 0)
 565                 return retval;
 566
 567         v4l2_ctrl_handler_setup(&radio->hdl);
 568
 569         return retval;
 570 }
 571
 572 /**************************************************************************
 573  * USB Interface
 574  **************************************************************************/
 575
 576 /*
 577  * si470x_usb_driver_probe - probe for the device
 578  */
 579 static int si470x_usb_driver_probe(struct usb_interface *intf,
 580                 const struct usb_device_id *id)
 581 {
 582         struct si470x_device *radio;
 583         struct usb_host_interface *iface_desc;
 584         struct usb_endpoint_descriptor *endpoint;
 585         int i, int_end_size, retval = 0;
 586         unsigned char version_warning = 0;
 587
 588         /* private data allocation and initialization */
 589         radio = kzalloc(sizeof(struct si470x_device), GFP_KERNEL);
 590         if (!radio) {
 591                 retval = -ENOMEM;
 592                 goto err_initial;
 593         }
 594         radio->usb_buf = kmalloc(MAX_REPORT_SIZE, GFP_KERNEL);
 595         if (radio->usb_buf == NULL) {
 596                 retval = -ENOMEM;
 597                 goto err_radio;
 598         }
 599         radio->usbdev = interface_to_usbdev(intf);
 600         radio->intf = intf;
 601         radio->band = 1; /* Default to 76 - 108 MHz */
 602         mutex_init(&radio->lock);
 603         init_completion(&radio->completion);
 604
 605         iface_desc = intf->cur_altsetting;
 606
 607         /* Set up interrupt endpoint information. */
 608         for (i = 0; i < iface_desc->desc.bNumEndpoints; ++i) {
 609                 endpoint = &iface_desc->endpoint[i].desc;
 610                 if (((endpoint->bEndpointAddress & USB_ENDPOINT_DIR_MASK) ==
 611                  USB_DIR_IN) && ((endpoint->bmAttributes &
 612                  USB_ENDPOINT_XFERTYPE_MASK) == USB_ENDPOINT_XFER_INT))
 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                 dev_info(&intf->dev, "could not allocate int_in_urb");
 633                 retval = -ENOMEM;
 634                 goto err_intbuffer;
 635         }
 636
 637         radio->v4l2_dev.release = si470x_usb_release;
 638
 639         /*
 640          * The si470x SiLabs reference design uses the same USB IDs as
 641          * 'Thanko's Raremono' si4734 based receiver. So check here which we
 642          * have: attempt to read the device ID from the si470x: the lower 12
 643          * bits should be 0x0242 for the si470x.
 644          *
 645          * We use this check to determine which device we are dealing with.
 646          */
 647         if (id->idVendor == 0x10c4 && id->idProduct == 0x818a) {
 648                 retval = usb_control_msg(radio->usbdev,
 649                                 usb_rcvctrlpipe(radio->usbdev, 0),
 650                                 HID_REQ_GET_REPORT,
 651                                 USB_TYPE_CLASS | USB_RECIP_INTERFACE | USB_DIR_IN,
 652                                 1, 2,
 653                                 radio->usb_buf, 3, 500);
 654                 if (retval != 3 ||
 655                     (get_unaligned_be16(&radio->usb_buf[1]) & 0xfff) != 0x0242) {
 656                         dev_info(&intf->dev, "this is not a si470x device.\n");
 657                         retval = -ENODEV;
 658                         goto err_urb;
 659                 }
 660         }
 661
 662         retval = v4l2_device_register(&intf->dev, &radio->v4l2_dev);
 663         if (retval < 0) {
 664                 dev_err(&intf->dev, "couldn't register v4l2_device\n");
 665                 goto err_urb;
 666         }
 667
 668         v4l2_ctrl_handler_init(&radio->hdl, 2);
 669         v4l2_ctrl_new_std(&radio->hdl, &si470x_ctrl_ops,
 670                           V4L2_CID_AUDIO_MUTE, 0, 1, 1, 1);
 671         v4l2_ctrl_new_std(&radio->hdl, &si470x_ctrl_ops,
 672                           V4L2_CID_AUDIO_VOLUME, 0, 15, 1, 15);
 673         if (radio->hdl.error) {
 674                 retval = radio->hdl.error;
 675                 dev_err(&intf->dev, "couldn't register control\n");
 676                 goto err_dev;
 677         }
 678         radio->videodev = si470x_viddev_template;
 679         radio->videodev.ctrl_handler = &radio->hdl;
 680         radio->videodev.lock = &radio->lock;
 681         radio->videodev.v4l2_dev = &radio->v4l2_dev;
 682         radio->videodev.release = video_device_release_empty;
 683         set_bit(V4L2_FL_USE_FH_PRIO, &radio->videodev.flags);
 684         video_set_drvdata(&radio->videodev, radio);
 685
 686         /* get device and chip versions */
 687         if (si470x_get_all_registers(radio) < 0) {
 688                 retval = -EIO;
 689                 goto err_ctrl;
 690         }
 691         dev_info(&intf->dev, "DeviceID=0x%4.4hx ChipID=0x%4.4hx\n",
 692                         radio->registers[DEVICEID], radio->registers[CHIPID]);
 693         if ((radio->registers[CHIPID] & CHIPID_FIRMWARE) < RADIO_FW_VERSION) {
 694                 dev_warn(&intf->dev,
 695                         "This driver is known to work with "
 696                         "firmware version %hu,\n", RADIO_FW_VERSION);
 697                 dev_warn(&intf->dev,
 698                         "but the device has firmware version %hu.\n",
 699                         radio->registers[CHIPID] & CHIPID_FIRMWARE);
 700                 version_warning = 1;
 701         }
 702
 703         /* get software and hardware versions */
 704         if (si470x_get_scratch_page_versions(radio) < 0) {
 705                 retval = -EIO;
 706                 goto err_ctrl;
 707         }
 708         dev_info(&intf->dev, "software version %d, hardware version %d\n",
 709                         radio->software_version, radio->hardware_version);
 710         if (radio->hardware_version < RADIO_HW_VERSION) {
 711                 dev_warn(&intf->dev,
 712                         "This driver is known to work with "
 713                         "hardware version %hu,\n", RADIO_HW_VERSION);
 714                 dev_warn(&intf->dev,
 715                         "but the device has hardware version %hu.\n",
 716                         radio->hardware_version);
 717                 version_warning = 1;
 718         }
 719
 720         /* give out version warning */
 721         if (version_warning == 1) {
 722                 dev_warn(&intf->dev,
 723                         "If you have some trouble using this driver,\n");
 724                 dev_warn(&intf->dev,
 725                         "please report to V4L ML at "
 726                         "linux-media@vger.kernel.org\n");
 727         }
 728
 729         /* set led to connect state */
 730         si470x_set_led_state(radio, BLINK_GREEN_LED);
 731
 732         /* rds buffer allocation */
 733         radio->buf_size = rds_buf * 3;
 734         radio->buffer = kmalloc(radio->buf_size, GFP_KERNEL);
 735         if (!radio->buffer) {
 736                 retval = -EIO;
 737                 goto err_ctrl;
 738         }
 739
 740         /* rds buffer configuration */
 741         radio->wr_index = 0;
 742         radio->rd_index = 0;
 743         init_waitqueue_head(&radio->read_queue);
 744         usb_set_intfdata(intf, radio);
 745
 746         /* start radio */
 747         retval = si470x_start_usb(radio);
 748         if (retval < 0)
 749                 goto err_all;
 750
 751         /* set initial frequency */
 752         si470x_set_freq(radio, 87.5 * FREQ_MUL); /* available in all regions */
 753
 754         /* register video device */
 755         retval = video_register_device(&radio->videodev, VFL_TYPE_RADIO,
 756                         radio_nr);
 757         if (retval) {
 758                 dev_err(&intf->dev, "Could not register video device\n");
 759                 goto err_all;
 760         }
 761
 762         return 0;
 763 err_all:
 764         kfree(radio->buffer);
 765 err_ctrl:
 766         v4l2_ctrl_handler_free(&radio->hdl);
 767 err_dev:
 768         v4l2_device_unregister(&radio->v4l2_dev);
 769 err_urb:
 770         usb_free_urb(radio->int_in_urb);
 771 err_intbuffer:
 772         kfree(radio->int_in_buffer);
 773 err_usbbuf:
 774         kfree(radio->usb_buf);
 775 err_radio:
 776         kfree(radio);
 777 err_initial:
 778         return retval;
 779 }
 780
 781
 782 /*
 783  * si470x_usb_driver_suspend - suspend the device
 784  */
 785 static int si470x_usb_driver_suspend(struct usb_interface *intf,
 786                 pm_message_t message)
 787 {
 788         struct si470x_device *radio = usb_get_intfdata(intf);
 789
 790         dev_info(&intf->dev, "suspending now...\n");
 791
 792         /* shutdown interrupt handler */
 793         if (radio->int_in_running) {
 794                 radio->int_in_running = 0;
 795                 if (radio->int_in_urb)
 796                         usb_kill_urb(radio->int_in_urb);
 797         }
 798
 799         /* cancel read processes */
 800         wake_up_interruptible(&radio->read_queue);
 801
 802         /* stop radio */
 803         si470x_stop(radio);
 804         return 0;
 805 }
 806
 807
 808 /*
 809  * si470x_usb_driver_resume - resume the device
 810  */
 811 static int si470x_usb_driver_resume(struct usb_interface *intf)
 812 {
 813         struct si470x_device *radio = usb_get_intfdata(intf);
 814         int ret;
 815
 816         dev_info(&intf->dev, "resuming now...\n");
 817
 818         /* start radio */
 819         ret = si470x_start_usb(radio);
 820         if (ret == 0)
 821                 v4l2_ctrl_handler_setup(&radio->hdl);
 822
 823         return ret;
 824 }
 825
 826
 827 /*
 828  * si470x_usb_driver_disconnect - disconnect the device
 829  */
 830 static void si470x_usb_driver_disconnect(struct usb_interface *intf)
 831 {
 832         struct si470x_device *radio = usb_get_intfdata(intf);
 833
 834         mutex_lock(&radio->lock);
 835         v4l2_device_disconnect(&radio->v4l2_dev);
 836         video_unregister_device(&radio->videodev);
 837         usb_set_intfdata(intf, NULL);
 838         mutex_unlock(&radio->lock);
 839         v4l2_device_put(&radio->v4l2_dev);
 840 }
 841
 842
 843 /*
 844  * si470x_usb_driver - usb driver interface
 845  *
 846  * A note on suspend/resume: this driver had only empty suspend/resume
 847  * functions, and when I tried to test suspend/resume it always disconnected
 848  * instead of resuming (using my ADS InstantFM stick). So I've decided to
 849  * remove these callbacks until someone else with better hardware can
 850  * implement and test this.
 851  */
 852 static struct usb_driver si470x_usb_driver = {
 853         .name                   = DRIVER_NAME,
 854         .probe                  = si470x_usb_driver_probe,
 855         .disconnect             = si470x_usb_driver_disconnect,
 856         .suspend                = si470x_usb_driver_suspend,
 857         .resume                 = si470x_usb_driver_resume,
 858         .reset_resume           = si470x_usb_driver_resume,
 859         .id_table               = si470x_usb_driver_id_table,
 860 };
 861
 862 module_usb_driver(si470x_usb_driver);
 863
 864 MODULE_LICENSE("GPL");
 865 MODULE_AUTHOR(DRIVER_AUTHOR);
 866 MODULE_DESCRIPTION(DRIVER_DESC);
 867 MODULE_VERSION(DRIVER_VERSION);