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
 141
 142 /**************************************************************************
 143  * Software/Hardware Versions from Scratch Page
 144  **************************************************************************/
 145 #define RADIO_SW_VERSION_NOT_BOOTLOADABLE       6
 146 #define RADIO_SW_VERSION                        1
 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 = (unsigned char *) 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 = (unsigned char *) 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         unsigned char buf[REGISTER_REPORT_SIZE];
 260         int retval;
 261
 262         buf[0] = REGISTER_REPORT(regnr);
 263
 264         retval = si470x_get_report(radio, (void *) &buf, sizeof(buf));
 265
 266         if (retval >= 0)
 267                 radio->registers[regnr] = get_unaligned_be16(&buf[1]);
 268
 269         return (retval < 0) ? -EINVAL : 0;
 270 }
 271
 272
 273 /*
 274  * si470x_set_register - write register
 275  */
 276 int si470x_set_register(struct si470x_device *radio, int regnr)
 277 {
 278         unsigned char buf[REGISTER_REPORT_SIZE];
 279         int retval;
 280
 281         buf[0] = REGISTER_REPORT(regnr);
 282         put_unaligned_be16(radio->registers[regnr], &buf[1]);
 283
 284         retval = si470x_set_report(radio, (void *) &buf, sizeof(buf));
 285
 286         return (retval < 0) ? -EINVAL : 0;
 287 }
 288
 289
 290
 291 /**************************************************************************
 292  * General Driver Functions - ENTIRE_REPORT
 293  **************************************************************************/
 294
 295 /*
 296  * si470x_get_all_registers - read entire registers
 297  */
 298 static int si470x_get_all_registers(struct si470x_device *radio)
 299 {
 300         unsigned char buf[ENTIRE_REPORT_SIZE];
 301         int retval;
 302         unsigned char regnr;
 303
 304         buf[0] = ENTIRE_REPORT;
 305
 306         retval = si470x_get_report(radio, (void *) &buf, sizeof(buf));
 307
 308         if (retval >= 0)
 309                 for (regnr = 0; regnr < RADIO_REGISTER_NUM; regnr++)
 310                         radio->registers[regnr] = get_unaligned_be16(
 311                                 &buf[regnr * RADIO_REGISTER_SIZE + 1]);
 312
 313         return (retval < 0) ? -EINVAL : 0;
 314 }
 315
 316
 317
 318 /**************************************************************************
 319  * General Driver Functions - LED_REPORT
 320  **************************************************************************/
 321
 322 /*
 323  * si470x_set_led_state - sets the led state
 324  */
 325 static int si470x_set_led_state(struct si470x_device *radio,
 326                 unsigned char led_state)
 327 {
 328         unsigned char buf[LED_REPORT_SIZE];
 329         int retval;
 330
 331         buf[0] = LED_REPORT;
 332         buf[1] = LED_COMMAND;
 333         buf[2] = led_state;
 334
 335         retval = si470x_set_report(radio, (void *) &buf, sizeof(buf));
 336
 337         return (retval < 0) ? -EINVAL : 0;
 338 }
 339
 340
 341
 342 /**************************************************************************
 343  * General Driver Functions - SCRATCH_REPORT
 344  **************************************************************************/
 345
 346 /*
 347  * si470x_get_scratch_versions - gets the scratch page and version infos
 348  */
 349 static int si470x_get_scratch_page_versions(struct si470x_device *radio)
 350 {
 351         unsigned char buf[SCRATCH_REPORT_SIZE];
 352         int retval;
 353
 354         buf[0] = SCRATCH_REPORT;
 355
 356         retval = si470x_get_report(radio, (void *) &buf, sizeof(buf));
 357
 358         if (retval < 0)
 359                 dev_warn(&radio->intf->dev, "si470x_get_scratch: "
 360                         "si470x_get_report returned %d\n", retval);
 361         else {
 362                 radio->software_version = buf[1];
 363                 radio->hardware_version = buf[2];
 364         }
 365
 366         return (retval < 0) ? -EINVAL : 0;
 367 }
 368
 369
 370
 371 /**************************************************************************
 372  * RDS Driver Functions
 373  **************************************************************************/
 374
 375 /*
 376  * si470x_int_in_callback - rds callback and processing function
 377  *
 378  * TODO: do we need to use mutex locks in some sections?
 379  */
 380 static void si470x_int_in_callback(struct urb *urb)
 381 {
 382         struct si470x_device *radio = urb->context;
 383         int retval;
 384         unsigned char regnr;
 385         unsigned char blocknum;
 386         unsigned short bler; /* rds block errors */
 387         unsigned short rds;
 388         unsigned char tmpbuf[3];
 389
 390         if (urb->status) {
 391                 if (urb->status == -ENOENT ||
 392                                 urb->status == -ECONNRESET ||
 393                                 urb->status == -ESHUTDOWN) {
 394                         return;
 395                 } else {
 396                         dev_warn(&radio->intf->dev,
 397                          "non-zero urb status (%d)\n", urb->status);
 398                         goto resubmit; /* Maybe we can recover. */
 399                 }
 400         }
 401
 402         /* Sometimes the device returns len 0 packets */
 403         if (urb->actual_length != RDS_REPORT_SIZE)
 404                 goto resubmit;
 405
 406         radio->registers[STATUSRSSI] =
 407                 get_unaligned_be16(&radio->int_in_buffer[1]);
 408
 409         if (radio->registers[STATUSRSSI] & STATUSRSSI_STC)
 410                 complete(&radio->completion);
 411
 412         if ((radio->registers[SYSCONFIG1] & SYSCONFIG1_RDS)) {
 413                 /* Update RDS registers with URB data */
 414                 for (regnr = 1; regnr < RDS_REGISTER_NUM; regnr++)
 415                         radio->registers[STATUSRSSI + regnr] =
 416                             get_unaligned_be16(&radio->int_in_buffer[
 417                                 regnr * RADIO_REGISTER_SIZE + 1]);
 418                 /* get rds blocks */
 419                 if ((radio->registers[STATUSRSSI] & STATUSRSSI_RDSR) == 0) {
 420                         /* No RDS group ready, better luck next time */
 421                         goto resubmit;
 422                 }
 423                 if ((radio->registers[STATUSRSSI] & STATUSRSSI_RDSS) == 0) {
 424                         /* RDS decoder not synchronized */
 425                         goto resubmit;
 426                 }
 427                 for (blocknum = 0; blocknum < 4; blocknum++) {
 428                         switch (blocknum) {
 429                         default:
 430                                 bler = (radio->registers[STATUSRSSI] &
 431                                                 STATUSRSSI_BLERA) >> 9;
 432                                 rds = radio->registers[RDSA];
 433                                 break;
 434                         case 1:
 435                                 bler = (radio->registers[READCHAN] &
 436                                                 READCHAN_BLERB) >> 14;
 437                                 rds = radio->registers[RDSB];
 438                                 break;
 439                         case 2:
 440                                 bler = (radio->registers[READCHAN] &
 441                                                 READCHAN_BLERC) >> 12;
 442                                 rds = radio->registers[RDSC];
 443                                 break;
 444                         case 3:
 445                                 bler = (radio->registers[READCHAN] &
 446                                                 READCHAN_BLERD) >> 10;
 447                                 rds = radio->registers[RDSD];
 448                                 break;
 449                         };
 450
 451                         /* Fill the V4L2 RDS buffer */
 452                         put_unaligned_le16(rds, &tmpbuf);
 453                         tmpbuf[2] = blocknum;           /* offset name */
 454                         tmpbuf[2] |= blocknum << 3;     /* received offset */
 455                         if (bler > max_rds_errors)
 456                                 tmpbuf[2] |= 0x80; /* uncorrectable errors */
 457                         else if (bler > 0)
 458                                 tmpbuf[2] |= 0x40; /* corrected error(s) */
 459
 460                         /* copy RDS block to internal buffer */
 461                         memcpy(&radio->buffer[radio->wr_index], &tmpbuf, 3);
 462                         radio->wr_index += 3;
 463
 464                         /* wrap write pointer */
 465                         if (radio->wr_index >= radio->buf_size)
 466                                 radio->wr_index = 0;
 467
 468                         /* check for overflow */
 469                         if (radio->wr_index == radio->rd_index) {
 470                                 /* increment and wrap read pointer */
 471                                 radio->rd_index += 3;
 472                                 if (radio->rd_index >= radio->buf_size)
 473                                         radio->rd_index = 0;
 474                         }
 475                 }
 476                 if (radio->wr_index != radio->rd_index)
 477                         wake_up_interruptible(&radio->read_queue);
 478         }
 479
 480 resubmit:
 481         /* Resubmit if we're still running. */
 482         if (radio->int_in_running && radio->usbdev) {
 483                 retval = usb_submit_urb(radio->int_in_urb, GFP_ATOMIC);
 484                 if (retval) {
 485                         dev_warn(&radio->intf->dev,
 486                                "resubmitting urb failed (%d)", retval);
 487                         radio->int_in_running = 0;
 488                 }
 489         }
 490         radio->status_rssi_auto_update = radio->int_in_running;
 491 }
 492
 493
 494 int si470x_fops_open(struct file *file)
 495 {
 496         return v4l2_fh_open(file);
 497 }
 498
 499 int si470x_fops_release(struct file *file)
 500 {
 501         return v4l2_fh_release(file);
 502 }
 503
 504 static void si470x_usb_release(struct v4l2_device *v4l2_dev)
 505 {
 506         struct si470x_device *radio =
 507                 container_of(v4l2_dev, struct si470x_device, v4l2_dev);
 508
 509         usb_free_urb(radio->int_in_urb);
 510         v4l2_ctrl_handler_free(&radio->hdl);
 511         v4l2_device_unregister(&radio->v4l2_dev);
 512         kfree(radio->int_in_buffer);
 513         kfree(radio->buffer);
 514         kfree(radio);
 515 }
 516
 517
 518 /**************************************************************************
 519  * Video4Linux Interface
 520  **************************************************************************/
 521
 522 /*
 523  * si470x_vidioc_querycap - query device capabilities
 524  */
 525 int si470x_vidioc_querycap(struct file *file, void *priv,
 526                 struct v4l2_capability *capability)
 527 {
 528         struct si470x_device *radio = video_drvdata(file);
 529
 530         strlcpy(capability->driver, DRIVER_NAME, sizeof(capability->driver));
 531         strlcpy(capability->card, DRIVER_CARD, sizeof(capability->card));
 532         usb_make_path(radio->usbdev, capability->bus_info,
 533                         sizeof(capability->bus_info));
 534         capability->device_caps = V4L2_CAP_HW_FREQ_SEEK | V4L2_CAP_READWRITE |
 535                 V4L2_CAP_TUNER | V4L2_CAP_RADIO | V4L2_CAP_RDS_CAPTURE;
 536         capability->capabilities = capability->device_caps | V4L2_CAP_DEVICE_CAPS;
 537         return 0;
 538 }
 539
 540
 541 static int si470x_start_usb(struct si470x_device *radio)
 542 {
 543         int retval;
 544
 545         /* initialize interrupt urb */
 546         usb_fill_int_urb(radio->int_in_urb, radio->usbdev,
 547                         usb_rcvintpipe(radio->usbdev,
 548                                 radio->int_in_endpoint->bEndpointAddress),
 549                         radio->int_in_buffer,
 550                         le16_to_cpu(radio->int_in_endpoint->wMaxPacketSize),
 551                         si470x_int_in_callback,
 552                         radio,
 553                         radio->int_in_endpoint->bInterval);
 554
 555         radio->int_in_running = 1;
 556         mb();
 557
 558         retval = usb_submit_urb(radio->int_in_urb, GFP_KERNEL);
 559         if (retval) {
 560                 dev_info(&radio->intf->dev,
 561                                 "submitting int urb failed (%d)\n", retval);
 562                 radio->int_in_running = 0;
 563         }
 564         radio->status_rssi_auto_update = radio->int_in_running;
 565
 566         /* start radio */
 567         retval = si470x_start(radio);
 568         if (retval < 0)
 569                 return retval;
 570
 571         v4l2_ctrl_handler_setup(&radio->hdl);
 572
 573         return retval;
 574 }
 575
 576 /**************************************************************************
 577  * USB Interface
 578  **************************************************************************/
 579
 580 /*
 581  * si470x_usb_driver_probe - probe for the device
 582  */
 583 static int si470x_usb_driver_probe(struct usb_interface *intf,
 584                 const struct usb_device_id *id)
 585 {
 586         struct si470x_device *radio;
 587         struct usb_host_interface *iface_desc;
 588         struct usb_endpoint_descriptor *endpoint;
 589         int i, int_end_size, retval = 0;
 590         unsigned char version_warning = 0;
 591
 592         /* private data allocation and initialization */
 593         radio = kzalloc(sizeof(struct si470x_device), GFP_KERNEL);
 594         if (!radio) {
 595                 retval = -ENOMEM;
 596                 goto err_initial;
 597         }
 598         radio->usbdev = interface_to_usbdev(intf);
 599         radio->intf = intf;
 600         radio->band = 1; /* Default to 76 - 108 MHz */
 601         mutex_init(&radio->lock);
 602         init_completion(&radio->completion);
 603
 604         iface_desc = intf->cur_altsetting;
 605
 606         /* Set up interrupt endpoint information. */
 607         for (i = 0; i < iface_desc->desc.bNumEndpoints; ++i) {
 608                 endpoint = &iface_desc->endpoint[i].desc;
 609                 if (((endpoint->bEndpointAddress & USB_ENDPOINT_DIR_MASK) ==
 610                  USB_DIR_IN) && ((endpoint->bmAttributes &
 611                  USB_ENDPOINT_XFERTYPE_MASK) == USB_ENDPOINT_XFER_INT))
 612                         radio->int_in_endpoint = endpoint;
 613         }
 614         if (!radio->int_in_endpoint) {
 615                 dev_info(&intf->dev, "could not find interrupt in endpoint\n");
 616                 retval = -EIO;
 617                 goto err_radio;
 618         }
 619
 620         int_end_size = le16_to_cpu(radio->int_in_endpoint->wMaxPacketSize);
 621
 622         radio->int_in_buffer = kmalloc(int_end_size, GFP_KERNEL);
 623         if (!radio->int_in_buffer) {
 624                 dev_info(&intf->dev, "could not allocate int_in_buffer");
 625                 retval = -ENOMEM;
 626                 goto err_radio;
 627         }
 628
 629         radio->int_in_urb = usb_alloc_urb(0, GFP_KERNEL);
 630         if (!radio->int_in_urb) {
 631                 dev_info(&intf->dev, "could not allocate int_in_urb");
 632                 retval = -ENOMEM;
 633                 goto err_intbuffer;
 634         }
 635
 636         radio->v4l2_dev.release = si470x_usb_release;
 637         retval = v4l2_device_register(&intf->dev, &radio->v4l2_dev);
 638         if (retval < 0) {
 639                 dev_err(&intf->dev, "couldn't register v4l2_device\n");
 640                 goto err_urb;
 641         }
 642
 643         v4l2_ctrl_handler_init(&radio->hdl, 2);
 644         v4l2_ctrl_new_std(&radio->hdl, &si470x_ctrl_ops,
 645                           V4L2_CID_AUDIO_MUTE, 0, 1, 1, 1);
 646         v4l2_ctrl_new_std(&radio->hdl, &si470x_ctrl_ops,
 647                           V4L2_CID_AUDIO_VOLUME, 0, 15, 1, 15);
 648         if (radio->hdl.error) {
 649                 retval = radio->hdl.error;
 650                 dev_err(&intf->dev, "couldn't register control\n");
 651                 goto err_dev;
 652         }
 653         radio->videodev = si470x_viddev_template;
 654         radio->videodev.ctrl_handler = &radio->hdl;
 655         radio->videodev.lock = &radio->lock;
 656         radio->videodev.v4l2_dev = &radio->v4l2_dev;
 657         radio->videodev.release = video_device_release_empty;
 658         set_bit(V4L2_FL_USE_FH_PRIO, &radio->videodev.flags);
 659         video_set_drvdata(&radio->videodev, radio);
 660
 661         /* get device and chip versions */
 662         if (si470x_get_all_registers(radio) < 0) {
 663                 retval = -EIO;
 664                 goto err_ctrl;
 665         }
 666         dev_info(&intf->dev, "DeviceID=0x%4.4hx ChipID=0x%4.4hx\n",
 667                         radio->registers[DEVICEID], radio->registers[CHIPID]);
 668         if ((radio->registers[CHIPID] & CHIPID_FIRMWARE) < RADIO_FW_VERSION) {
 669                 dev_warn(&intf->dev,
 670                         "This driver is known to work with "
 671                         "firmware version %hu,\n", RADIO_FW_VERSION);
 672                 dev_warn(&intf->dev,
 673                         "but the device has firmware version %hu.\n",
 674                         radio->registers[CHIPID] & CHIPID_FIRMWARE);
 675                 version_warning = 1;
 676         }
 677
 678         /* get software and hardware versions */
 679         if (si470x_get_scratch_page_versions(radio) < 0) {
 680                 retval = -EIO;
 681                 goto err_ctrl;
 682         }
 683         dev_info(&intf->dev, "software version %d, hardware version %d\n",
 684                         radio->software_version, radio->hardware_version);
 685         if (radio->software_version < RADIO_SW_VERSION) {
 686                 dev_warn(&intf->dev,
 687                         "This driver is known to work with "
 688                         "software version %hu,\n", RADIO_SW_VERSION);
 689                 dev_warn(&intf->dev,
 690                         "but the device has software version %hu.\n",
 691                         radio->software_version);
 692                 version_warning = 1;
 693         }
 694         if (radio->hardware_version < RADIO_HW_VERSION) {
 695                 dev_warn(&intf->dev,
 696                         "This driver is known to work with "
 697                         "hardware version %hu,\n", RADIO_HW_VERSION);
 698                 dev_warn(&intf->dev,
 699                         "but the device has hardware version %hu.\n",
 700                         radio->hardware_version);
 701                 version_warning = 1;
 702         }
 703
 704         /* give out version warning */
 705         if (version_warning == 1) {
 706                 dev_warn(&intf->dev,
 707                         "If you have some trouble using this driver,\n");
 708                 dev_warn(&intf->dev,
 709                         "please report to V4L ML at "
 710                         "linux-media@vger.kernel.org\n");
 711         }
 712
 713         /* set led to connect state */
 714         si470x_set_led_state(radio, BLINK_GREEN_LED);
 715
 716         /* rds buffer allocation */
 717         radio->buf_size = rds_buf * 3;
 718         radio->buffer = kmalloc(radio->buf_size, GFP_KERNEL);
 719         if (!radio->buffer) {
 720                 retval = -EIO;
 721                 goto err_ctrl;
 722         }
 723
 724         /* rds buffer configuration */
 725         radio->wr_index = 0;
 726         radio->rd_index = 0;
 727         init_waitqueue_head(&radio->read_queue);
 728         usb_set_intfdata(intf, radio);
 729
 730         /* start radio */
 731         retval = si470x_start_usb(radio);
 732         if (retval < 0)
 733                 goto err_all;
 734
 735         /* set initial frequency */
 736         si470x_set_freq(radio, 87.5 * FREQ_MUL); /* available in all regions */
 737
 738         /* register video device */
 739         retval = video_register_device(&radio->videodev, VFL_TYPE_RADIO,
 740                         radio_nr);
 741         if (retval) {
 742                 dev_err(&intf->dev, "Could not register video device\n");
 743                 goto err_all;
 744         }
 745
 746         return 0;
 747 err_all:
 748         kfree(radio->buffer);
 749 err_ctrl:
 750         v4l2_ctrl_handler_free(&radio->hdl);
 751 err_dev:
 752         v4l2_device_unregister(&radio->v4l2_dev);
 753 err_urb:
 754         usb_free_urb(radio->int_in_urb);
 755 err_intbuffer:
 756         kfree(radio->int_in_buffer);
 757 err_radio:
 758         kfree(radio);
 759 err_initial:
 760         return retval;
 761 }
 762
 763
 764 /*
 765  * si470x_usb_driver_suspend - suspend the device
 766  */
 767 static int si470x_usb_driver_suspend(struct usb_interface *intf,
 768                 pm_message_t message)
 769 {
 770         struct si470x_device *radio = usb_get_intfdata(intf);
 771
 772         dev_info(&intf->dev, "suspending now...\n");
 773
 774         /* shutdown interrupt handler */
 775         if (radio->int_in_running) {
 776                 radio->int_in_running = 0;
 777                 if (radio->int_in_urb)
 778                         usb_kill_urb(radio->int_in_urb);
 779         }
 780
 781         /* cancel read processes */
 782         wake_up_interruptible(&radio->read_queue);
 783
 784         /* stop radio */
 785         si470x_stop(radio);
 786         return 0;
 787 }
 788
 789
 790 /*
 791  * si470x_usb_driver_resume - resume the device
 792  */
 793 static int si470x_usb_driver_resume(struct usb_interface *intf)
 794 {
 795         struct si470x_device *radio = usb_get_intfdata(intf);
 796         int ret;
 797
 798         dev_info(&intf->dev, "resuming now...\n");
 799
 800         /* start radio */
 801         ret = si470x_start_usb(radio);
 802         if (ret == 0)
 803                 v4l2_ctrl_handler_setup(&radio->hdl);
 804
 805         return ret;
 806 }
 807
 808
 809 /*
 810  * si470x_usb_driver_disconnect - disconnect the device
 811  */
 812 static void si470x_usb_driver_disconnect(struct usb_interface *intf)
 813 {
 814         struct si470x_device *radio = usb_get_intfdata(intf);
 815
 816         mutex_lock(&radio->lock);
 817         v4l2_device_disconnect(&radio->v4l2_dev);
 818         video_unregister_device(&radio->videodev);
 819         usb_set_intfdata(intf, NULL);
 820         mutex_unlock(&radio->lock);
 821         v4l2_device_put(&radio->v4l2_dev);
 822 }
 823
 824
 825 /*
 826  * si470x_usb_driver - usb driver interface
 827  *
 828  * A note on suspend/resume: this driver had only empty suspend/resume
 829  * functions, and when I tried to test suspend/resume it always disconnected
 830  * instead of resuming (using my ADS InstantFM stick). So I've decided to
 831  * remove these callbacks until someone else with better hardware can
 832  * implement and test this.
 833  */
 834 static struct usb_driver si470x_usb_driver = {
 835         .name                   = DRIVER_NAME,
 836         .probe                  = si470x_usb_driver_probe,
 837         .disconnect             = si470x_usb_driver_disconnect,
 838         .suspend                = si470x_usb_driver_suspend,
 839         .resume                 = si470x_usb_driver_resume,
 840         .reset_resume           = si470x_usb_driver_resume,
 841         .id_table               = si470x_usb_driver_id_table,
 842 };
 843
 844 module_usb_driver(si470x_usb_driver);
 845
 846 MODULE_LICENSE("GPL");
 847 MODULE_AUTHOR(DRIVER_AUTHOR);
 848 MODULE_DESCRIPTION(DRIVER_DESC);
 849 MODULE_VERSION(DRIVER_VERSION);