Pileus Git - ~andy/linux/blob - 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_HW_VERSION                        1
 146
 147
 148
 149 /**************************************************************************
 150  * LED State Definitions
 151  **************************************************************************/
 152 #define LED_COMMAND             0x35
 153
 154 #define NO_CHANGE_LED           0x00
 155 #define ALL_COLOR_LED           0x01    /* streaming state */
 156 #define BLINK_GREEN_LED         0x02    /* connect state */
 157 #define BLINK_RED_LED           0x04
 158 #define BLINK_ORANGE_LED        0x10    /* disconnect state */
 159 #define SOLID_GREEN_LED         0x20    /* tuning/seeking state */
 160 #define SOLID_RED_LED           0x40    /* bootload state */
 161 #define SOLID_ORANGE_LED        0x80
 162
 163
 164
 165 /**************************************************************************
 166  * Stream State Definitions
 167  **************************************************************************/
 168 #define STREAM_COMMAND  0x36
 169 #define STREAM_VIDPID   0x00
 170 #define STREAM_AUDIO    0xff
 171
 172
 173
 174 /**************************************************************************
 175  * Bootloader / Flash Commands
 176  **************************************************************************/
 177
 178 /* unique id sent to bootloader and required to put into a bootload state */
 179 #define UNIQUE_BL_ID            0x34
 180
 181 /* mask for the flash data */
 182 #define FLASH_DATA_MASK         0x55
 183
 184 /* bootloader commands */
 185 #define GET_SW_VERSION_COMMAND  0x00
 186 #define SET_PAGE_COMMAND        0x01
 187 #define ERASE_PAGE_COMMAND      0x02
 188 #define WRITE_PAGE_COMMAND      0x03
 189 #define CRC_ON_PAGE_COMMAND     0x04
 190 #define READ_FLASH_BYTE_COMMAND 0x05
 191 #define RESET_DEVICE_COMMAND    0x06
 192 #define GET_HW_VERSION_COMMAND  0x07
 193 #define BLANK                   0xff
 194
 195 /* bootloader command responses */
 196 #define COMMAND_OK              0x01
 197 #define COMMAND_FAILED          0x02
 198 #define COMMAND_PENDING         0x03
 199
 200
 201
 202 /**************************************************************************
 203  * General Driver Functions - REGISTER_REPORTs
 204  **************************************************************************/
 205
 206 /*
 207  * si470x_get_report - receive a HID report
 208  */
 209 static int si470x_get_report(struct si470x_device *radio, void *buf, int size)
 210 {
 211         unsigned char *report = (unsigned char *) buf;
 212         int retval;
 213
 214         retval = usb_control_msg(radio->usbdev,
 215                 usb_rcvctrlpipe(radio->usbdev, 0),
 216                 HID_REQ_GET_REPORT,
 217                 USB_TYPE_CLASS | USB_RECIP_INTERFACE | USB_DIR_IN,
 218                 report[0], 2,
 219                 buf, size, usb_timeout);
 220
 221         if (retval < 0)
 222                 dev_warn(&radio->intf->dev,
 223                         "si470x_get_report: usb_control_msg returned %d\n",
 224                         retval);
 225         return retval;
 226 }
 227
 228
 229 /*
 230  * si470x_set_report - send a HID report
 231  */
 232 static int si470x_set_report(struct si470x_device *radio, void *buf, int size)
 233 {
 234         unsigned char *report = (unsigned char *) buf;
 235         int retval;
 236
 237         retval = usb_control_msg(radio->usbdev,
 238                 usb_sndctrlpipe(radio->usbdev, 0),
 239                 HID_REQ_SET_REPORT,
 240                 USB_TYPE_CLASS | USB_RECIP_INTERFACE | USB_DIR_OUT,
 241                 report[0], 2,
 242                 buf, size, usb_timeout);
 243
 244         if (retval < 0)
 245                 dev_warn(&radio->intf->dev,
 246                         "si470x_set_report: usb_control_msg returned %d\n",
 247                         retval);
 248         return retval;
 249 }
 250
 251
 252 /*
 253  * si470x_get_register - read register
 254  */
 255 int si470x_get_register(struct si470x_device *radio, int regnr)
 256 {
 257         unsigned char buf[REGISTER_REPORT_SIZE];
 258         int retval;
 259
 260         buf[0] = REGISTER_REPORT(regnr);
 261
 262         retval = si470x_get_report(radio, (void *) &buf, sizeof(buf));
 263
 264         if (retval >= 0)
 265                 radio->registers[regnr] = get_unaligned_be16(&buf[1]);
 266
 267         return (retval < 0) ? -EINVAL : 0;
 268 }
 269
 270
 271 /*
 272  * si470x_set_register - write register
 273  */
 274 int si470x_set_register(struct si470x_device *radio, int regnr)
 275 {
 276         unsigned char buf[REGISTER_REPORT_SIZE];
 277         int retval;
 278
 279         buf[0] = REGISTER_REPORT(regnr);
 280         put_unaligned_be16(radio->registers[regnr], &buf[1]);
 281
 282         retval = si470x_set_report(radio, (void *) &buf, sizeof(buf));
 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         unsigned char buf[ENTIRE_REPORT_SIZE];
 299         int retval;
 300         unsigned char regnr;
 301
 302         buf[0] = ENTIRE_REPORT;
 303
 304         retval = si470x_get_report(radio, (void *) &buf, sizeof(buf));
 305
 306         if (retval >= 0)
 307                 for (regnr = 0; regnr < RADIO_REGISTER_NUM; regnr++)
 308                         radio->registers[regnr] = get_unaligned_be16(
 309                                 &buf[regnr * RADIO_REGISTER_SIZE + 1]);
 310
 311         return (retval < 0) ? -EINVAL : 0;
 312 }
 313
 314
 315
 316 /**************************************************************************
 317  * General Driver Functions - LED_REPORT
 318  **************************************************************************/
 319
 320 /*
 321  * si470x_set_led_state - sets the led state
 322  */
 323 static int si470x_set_led_state(struct si470x_device *radio,
 324                 unsigned char led_state)
 325 {
 326         unsigned char buf[LED_REPORT_SIZE];
 327         int retval;
 328
 329         buf[0] = LED_REPORT;
 330         buf[1] = LED_COMMAND;
 331         buf[2] = led_state;
 332
 333         retval = si470x_set_report(radio, (void *) &buf, sizeof(buf));
 334
 335         return (retval < 0) ? -EINVAL : 0;
 336 }
 337
 338
 339
 340 /**************************************************************************
 341  * General Driver Functions - SCRATCH_REPORT
 342  **************************************************************************/
 343
 344 /*
 345  * si470x_get_scratch_versions - gets the scratch page and version infos
 346  */
 347 static int si470x_get_scratch_page_versions(struct si470x_device *radio)
 348 {
 349         unsigned char buf[SCRATCH_REPORT_SIZE];
 350         int retval;
 351
 352         buf[0] = SCRATCH_REPORT;
 353
 354         retval = si470x_get_report(radio, (void *) &buf, sizeof(buf));
 355
 356         if (retval < 0)
 357                 dev_warn(&radio->intf->dev, "si470x_get_scratch: "
 358                         "si470x_get_report returned %d\n", retval);
 359         else {
 360                 radio->software_version = buf[1];
 361                 radio->hardware_version = buf[2];
 362         }
 363
 364         return (retval < 0) ? -EINVAL : 0;
 365 }
 366
 367
 368
 369 /**************************************************************************
 370  * RDS Driver Functions
 371  **************************************************************************/
 372
 373 /*
 374  * si470x_int_in_callback - rds callback and processing function
 375  *
 376  * TODO: do we need to use mutex locks in some sections?
 377  */
 378 static void si470x_int_in_callback(struct urb *urb)
 379 {
 380         struct si470x_device *radio = urb->context;
 381         int retval;
 382         unsigned char regnr;
 383         unsigned char blocknum;
 384         unsigned short bler; /* rds block errors */
 385         unsigned short rds;
 386         unsigned char tmpbuf[3];
 387
 388         if (urb->status) {
 389                 if (urb->status == -ENOENT ||
 390                                 urb->status == -ECONNRESET ||
 391                                 urb->status == -ESHUTDOWN) {
 392                         return;
 393                 } else {
 394                         dev_warn(&radio->intf->dev,
 395                          "non-zero urb status (%d)\n", urb->status);
 396                         goto resubmit; /* Maybe we can recover. */
 397                 }
 398         }
 399
 400         /* Sometimes the device returns len 0 packets */
 401         if (urb->actual_length != RDS_REPORT_SIZE)
 402                 goto resubmit;
 403
 404         radio->registers[STATUSRSSI] =
 405                 get_unaligned_be16(&radio->int_in_buffer[1]);
 406
 407         if (radio->registers[STATUSRSSI] & STATUSRSSI_STC)
 408                 complete(&radio->completion);
 409
 410         if ((radio->registers[SYSCONFIG1] & SYSCONFIG1_RDS)) {
 411                 /* Update RDS registers with URB data */
 412                 for (regnr = 1; regnr < RDS_REGISTER_NUM; regnr++)
 413                         radio->registers[STATUSRSSI + regnr] =
 414                             get_unaligned_be16(&radio->int_in_buffer[
 415                                 regnr * RADIO_REGISTER_SIZE + 1]);
 416                 /* get rds blocks */
 417                 if ((radio->registers[STATUSRSSI] & STATUSRSSI_RDSR) == 0) {
 418                         /* No RDS group ready, better luck next time */
 419                         goto resubmit;
 420                 }
 421                 if ((radio->registers[STATUSRSSI] & STATUSRSSI_RDSS) == 0) {
 422                         /* RDS decoder not synchronized */
 423                         goto resubmit;
 424                 }
 425                 for (blocknum = 0; blocknum < 4; blocknum++) {
 426                         switch (blocknum) {
 427                         default:
 428                                 bler = (radio->registers[STATUSRSSI] &
 429                                                 STATUSRSSI_BLERA) >> 9;
 430                                 rds = radio->registers[RDSA];
 431                                 break;
 432                         case 1:
 433                                 bler = (radio->registers[READCHAN] &
 434                                                 READCHAN_BLERB) >> 14;
 435                                 rds = radio->registers[RDSB];
 436                                 break;
 437                         case 2:
 438                                 bler = (radio->registers[READCHAN] &
 439                                                 READCHAN_BLERC) >> 12;
 440                                 rds = radio->registers[RDSC];
 441                                 break;
 442                         case 3:
 443                                 bler = (radio->registers[READCHAN] &
 444                                                 READCHAN_BLERD) >> 10;
 445                                 rds = radio->registers[RDSD];
 446                                 break;
 447                         }
 448
 449                         /* Fill the V4L2 RDS buffer */
 450                         put_unaligned_le16(rds, &tmpbuf);
 451                         tmpbuf[2] = blocknum;           /* offset name */
 452                         tmpbuf[2] |= blocknum << 3;     /* received offset */
 453                         if (bler > max_rds_errors)
 454                                 tmpbuf[2] |= 0x80; /* uncorrectable errors */
 455                         else if (bler > 0)
 456                                 tmpbuf[2] |= 0x40; /* corrected error(s) */
 457
 458                         /* copy RDS block to internal buffer */
 459                         memcpy(&radio->buffer[radio->wr_index], &tmpbuf, 3);
 460                         radio->wr_index += 3;
 461
 462                         /* wrap write pointer */
 463                         if (radio->wr_index >= radio->buf_size)
 464                                 radio->wr_index = 0;
 465
 466                         /* check for overflow */
 467                         if (radio->wr_index == radio->rd_index) {
 468                                 /* increment and wrap read pointer */
 469                                 radio->rd_index += 3;
 470                                 if (radio->rd_index >= radio->buf_size)
 471                                         radio->rd_index = 0;
 472                         }
 473                 }
 474                 if (radio->wr_index != radio->rd_index)
 475                         wake_up_interruptible(&radio->read_queue);
 476         }
 477
 478 resubmit:
 479         /* Resubmit if we're still running. */
 480         if (radio->int_in_running && radio->usbdev) {
 481                 retval = usb_submit_urb(radio->int_in_urb, GFP_ATOMIC);
 482                 if (retval) {
 483                         dev_warn(&radio->intf->dev,
 484                                "resubmitting urb failed (%d)", retval);
 485                         radio->int_in_running = 0;
 486                 }
 487         }
 488         radio->status_rssi_auto_update = radio->int_in_running;
 489 }
 490
 491
 492 int si470x_fops_open(struct file *file)
 493 {
 494         return v4l2_fh_open(file);
 495 }
 496
 497 int si470x_fops_release(struct file *file)
 498 {
 499         return v4l2_fh_release(file);
 500 }
 501
 502 static void si470x_usb_release(struct v4l2_device *v4l2_dev)
 503 {
 504         struct si470x_device *radio =
 505                 container_of(v4l2_dev, struct si470x_device, v4l2_dev);
 506
 507         usb_free_urb(radio->int_in_urb);
 508         v4l2_ctrl_handler_free(&radio->hdl);
 509         v4l2_device_unregister(&radio->v4l2_dev);
 510         kfree(radio->int_in_buffer);
 511         kfree(radio->buffer);
 512         kfree(radio);
 513 }
 514
 515
 516 /**************************************************************************
 517  * Video4Linux Interface
 518  **************************************************************************/
 519
 520 /*
 521  * si470x_vidioc_querycap - query device capabilities
 522  */
 523 int si470x_vidioc_querycap(struct file *file, void *priv,
 524                 struct v4l2_capability *capability)
 525 {
 526         struct si470x_device *radio = video_drvdata(file);
 527
 528         strlcpy(capability->driver, DRIVER_NAME, sizeof(capability->driver));
 529         strlcpy(capability->card, DRIVER_CARD, sizeof(capability->card));
 530         usb_make_path(radio->usbdev, capability->bus_info,
 531                         sizeof(capability->bus_info));
 532         capability->device_caps = V4L2_CAP_HW_FREQ_SEEK | V4L2_CAP_READWRITE |
 533                 V4L2_CAP_TUNER | V4L2_CAP_RADIO | V4L2_CAP_RDS_CAPTURE;
 534         capability->capabilities = capability->device_caps | V4L2_CAP_DEVICE_CAPS;
 535         return 0;
 536 }
 537
 538
 539 static int si470x_start_usb(struct si470x_device *radio)
 540 {
 541         int retval;
 542
 543         /* initialize interrupt urb */
 544         usb_fill_int_urb(radio->int_in_urb, radio->usbdev,
 545                         usb_rcvintpipe(radio->usbdev,
 546                                 radio->int_in_endpoint->bEndpointAddress),
 547                         radio->int_in_buffer,
 548                         le16_to_cpu(radio->int_in_endpoint->wMaxPacketSize),
 549                         si470x_int_in_callback,
 550                         radio,
 551                         radio->int_in_endpoint->bInterval);
 552
 553         radio->int_in_running = 1;
 554         mb();
 555
 556         retval = usb_submit_urb(radio->int_in_urb, GFP_KERNEL);
 557         if (retval) {
 558                 dev_info(&radio->intf->dev,
 559                                 "submitting int urb failed (%d)\n", retval);
 560                 radio->int_in_running = 0;
 561         }
 562         radio->status_rssi_auto_update = radio->int_in_running;
 563
 564         /* start radio */
 565         retval = si470x_start(radio);
 566         if (retval < 0)
 567                 return retval;
 568
 569         v4l2_ctrl_handler_setup(&radio->hdl);
 570
 571         return retval;
 572 }
 573
 574 /**************************************************************************
 575  * USB Interface
 576  **************************************************************************/
 577
 578 /*
 579  * si470x_usb_driver_probe - probe for the device
 580  */
 581 static int si470x_usb_driver_probe(struct usb_interface *intf,
 582                 const struct usb_device_id *id)
 583 {
 584         struct si470x_device *radio;
 585         struct usb_host_interface *iface_desc;
 586         struct usb_endpoint_descriptor *endpoint;
 587         int i, int_end_size, retval = 0;
 588         unsigned char version_warning = 0;
 589
 590         /* private data allocation and initialization */
 591         radio = kzalloc(sizeof(struct si470x_device), GFP_KERNEL);
 592         if (!radio) {
 593                 retval = -ENOMEM;
 594                 goto err_initial;
 595         }
 596         radio->usbdev = interface_to_usbdev(intf);
 597         radio->intf = intf;
 598         radio->band = 1; /* Default to 76 - 108 MHz */
 599         mutex_init(&radio->lock);
 600         init_completion(&radio->completion);
 601
 602         iface_desc = intf->cur_altsetting;
 603
 604         /* Set up interrupt endpoint information. */
 605         for (i = 0; i < iface_desc->desc.bNumEndpoints; ++i) {
 606                 endpoint = &iface_desc->endpoint[i].desc;
 607                 if (((endpoint->bEndpointAddress & USB_ENDPOINT_DIR_MASK) ==
 608                  USB_DIR_IN) && ((endpoint->bmAttributes &
 609                  USB_ENDPOINT_XFERTYPE_MASK) == USB_ENDPOINT_XFER_INT))
 610                         radio->int_in_endpoint = endpoint;
 611         }
 612         if (!radio->int_in_endpoint) {
 613                 dev_info(&intf->dev, "could not find interrupt in endpoint\n");
 614                 retval = -EIO;
 615                 goto err_radio;
 616         }
 617
 618         int_end_size = le16_to_cpu(radio->int_in_endpoint->wMaxPacketSize);
 619
 620         radio->int_in_buffer = kmalloc(int_end_size, GFP_KERNEL);
 621         if (!radio->int_in_buffer) {
 622                 dev_info(&intf->dev, "could not allocate int_in_buffer");
 623                 retval = -ENOMEM;
 624                 goto err_radio;
 625         }
 626
 627         radio->int_in_urb = usb_alloc_urb(0, GFP_KERNEL);
 628         if (!radio->int_in_urb) {
 629                 dev_info(&intf->dev, "could not allocate int_in_urb");
 630                 retval = -ENOMEM;
 631                 goto err_intbuffer;
 632         }
 633
 634         radio->v4l2_dev.release = si470x_usb_release;
 635         retval = v4l2_device_register(&intf->dev, &radio->v4l2_dev);
 636         if (retval < 0) {
 637                 dev_err(&intf->dev, "couldn't register v4l2_device\n");
 638                 goto err_urb;
 639         }
 640
 641         v4l2_ctrl_handler_init(&radio->hdl, 2);
 642         v4l2_ctrl_new_std(&radio->hdl, &si470x_ctrl_ops,
 643                           V4L2_CID_AUDIO_MUTE, 0, 1, 1, 1);
 644         v4l2_ctrl_new_std(&radio->hdl, &si470x_ctrl_ops,
 645                           V4L2_CID_AUDIO_VOLUME, 0, 15, 1, 15);
 646         if (radio->hdl.error) {
 647                 retval = radio->hdl.error;
 648                 dev_err(&intf->dev, "couldn't register control\n");
 649                 goto err_dev;
 650         }
 651         radio->videodev = si470x_viddev_template;
 652         radio->videodev.ctrl_handler = &radio->hdl;
 653         radio->videodev.lock = &radio->lock;
 654         radio->videodev.v4l2_dev = &radio->v4l2_dev;
 655         radio->videodev.release = video_device_release_empty;
 656         set_bit(V4L2_FL_USE_FH_PRIO, &radio->videodev.flags);
 657         video_set_drvdata(&radio->videodev, radio);
 658
 659         /* get device and chip versions */
 660         if (si470x_get_all_registers(radio) < 0) {
 661                 retval = -EIO;
 662                 goto err_ctrl;
 663         }
 664         dev_info(&intf->dev, "DeviceID=0x%4.4hx ChipID=0x%4.4hx\n",
 665                         radio->registers[DEVICEID], radio->registers[CHIPID]);
 666         if ((radio->registers[CHIPID] & CHIPID_FIRMWARE) < RADIO_FW_VERSION) {
 667                 dev_warn(&intf->dev,
 668                         "This driver is known to work with "
 669                         "firmware version %hu,\n", RADIO_FW_VERSION);
 670                 dev_warn(&intf->dev,
 671                         "but the device has firmware version %hu.\n",
 672                         radio->registers[CHIPID] & CHIPID_FIRMWARE);
 673                 version_warning = 1;
 674         }
 675
 676         /* get software and hardware versions */
 677         if (si470x_get_scratch_page_versions(radio) < 0) {
 678                 retval = -EIO;
 679                 goto err_ctrl;
 680         }
 681         dev_info(&intf->dev, "software version %d, hardware version %d\n",
 682                         radio->software_version, radio->hardware_version);
 683         if (radio->hardware_version < RADIO_HW_VERSION) {
 684                 dev_warn(&intf->dev,
 685                         "This driver is known to work with "
 686                         "hardware version %hu,\n", RADIO_HW_VERSION);
 687                 dev_warn(&intf->dev,
 688                         "but the device has hardware version %hu.\n",
 689                         radio->hardware_version);
 690                 version_warning = 1;
 691         }
 692
 693         /* give out version warning */
 694         if (version_warning == 1) {
 695                 dev_warn(&intf->dev,
 696                         "If you have some trouble using this driver,\n");
 697                 dev_warn(&intf->dev,
 698                         "please report to V4L ML at "
 699                         "linux-media@vger.kernel.org\n");
 700         }
 701
 702         /* set led to connect state */
 703         si470x_set_led_state(radio, BLINK_GREEN_LED);
 704
 705         /* rds buffer allocation */
 706         radio->buf_size = rds_buf * 3;
 707         radio->buffer = kmalloc(radio->buf_size, GFP_KERNEL);
 708         if (!radio->buffer) {
 709                 retval = -EIO;
 710                 goto err_ctrl;
 711         }
 712
 713         /* rds buffer configuration */
 714         radio->wr_index = 0;
 715         radio->rd_index = 0;
 716         init_waitqueue_head(&radio->read_queue);
 717         usb_set_intfdata(intf, radio);
 718
 719         /* start radio */
 720         retval = si470x_start_usb(radio);
 721         if (retval < 0)
 722                 goto err_all;
 723
 724         /* set initial frequency */
 725         si470x_set_freq(radio, 87.5 * FREQ_MUL); /* available in all regions */
 726
 727         /* register video device */
 728         retval = video_register_device(&radio->videodev, VFL_TYPE_RADIO,
 729                         radio_nr);
 730         if (retval) {
 731                 dev_err(&intf->dev, "Could not register video device\n");
 732                 goto err_all;
 733         }
 734
 735         return 0;
 736 err_all:
 737         kfree(radio->buffer);
 738 err_ctrl:
 739         v4l2_ctrl_handler_free(&radio->hdl);
 740 err_dev:
 741         v4l2_device_unregister(&radio->v4l2_dev);
 742 err_urb:
 743         usb_free_urb(radio->int_in_urb);
 744 err_intbuffer:
 745         kfree(radio->int_in_buffer);
 746 err_radio:
 747         kfree(radio);
 748 err_initial:
 749         return retval;
 750 }
 751
 752
 753 /*
 754  * si470x_usb_driver_suspend - suspend the device
 755  */
 756 static int si470x_usb_driver_suspend(struct usb_interface *intf,
 757                 pm_message_t message)
 758 {
 759         struct si470x_device *radio = usb_get_intfdata(intf);
 760
 761         dev_info(&intf->dev, "suspending now...\n");
 762
 763         /* shutdown interrupt handler */
 764         if (radio->int_in_running) {
 765                 radio->int_in_running = 0;
 766                 if (radio->int_in_urb)
 767                         usb_kill_urb(radio->int_in_urb);
 768         }
 769
 770         /* cancel read processes */
 771         wake_up_interruptible(&radio->read_queue);
 772
 773         /* stop radio */
 774         si470x_stop(radio);
 775         return 0;
 776 }
 777
 778
 779 /*
 780  * si470x_usb_driver_resume - resume the device
 781  */
 782 static int si470x_usb_driver_resume(struct usb_interface *intf)
 783 {
 784         struct si470x_device *radio = usb_get_intfdata(intf);
 785         int ret;
 786
 787         dev_info(&intf->dev, "resuming now...\n");
 788
 789         /* start radio */
 790         ret = si470x_start_usb(radio);
 791         if (ret == 0)
 792                 v4l2_ctrl_handler_setup(&radio->hdl);
 793
 794         return ret;
 795 }
 796
 797
 798 /*
 799  * si470x_usb_driver_disconnect - disconnect the device
 800  */
 801 static void si470x_usb_driver_disconnect(struct usb_interface *intf)
 802 {
 803         struct si470x_device *radio = usb_get_intfdata(intf);
 804
 805         mutex_lock(&radio->lock);
 806         v4l2_device_disconnect(&radio->v4l2_dev);
 807         video_unregister_device(&radio->videodev);
 808         usb_set_intfdata(intf, NULL);
 809         mutex_unlock(&radio->lock);
 810         v4l2_device_put(&radio->v4l2_dev);
 811 }
 812
 813
 814 /*
 815  * si470x_usb_driver - usb driver interface
 816  *
 817  * A note on suspend/resume: this driver had only empty suspend/resume
 818  * functions, and when I tried to test suspend/resume it always disconnected
 819  * instead of resuming (using my ADS InstantFM stick). So I've decided to
 820  * remove these callbacks until someone else with better hardware can
 821  * implement and test this.
 822  */
 823 static struct usb_driver si470x_usb_driver = {
 824         .name                   = DRIVER_NAME,
 825         .probe                  = si470x_usb_driver_probe,
 826         .disconnect             = si470x_usb_driver_disconnect,
 827         .suspend                = si470x_usb_driver_suspend,
 828         .resume                 = si470x_usb_driver_resume,
 829         .reset_resume           = si470x_usb_driver_resume,
 830         .id_table               = si470x_usb_driver_id_table,
 831 };
 832
 833 module_usb_driver(si470x_usb_driver);
 834
 835 MODULE_LICENSE("GPL");
 836 MODULE_AUTHOR(DRIVER_AUTHOR);
 837 MODULE_DESCRIPTION(DRIVER_DESC);
 838 MODULE_VERSION(DRIVER_VERSION);