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_KERNEL_VERSION KERNEL_VERSION(1, 0, 10)
  33 #define DRIVER_CARD "Silicon Labs Si470x FM Radio Receiver"
  34 #define DRIVER_DESC "USB radio driver for Si470x FM Radio Receivers"
  35 #define DRIVER_VERSION "1.0.10"
  36
  37 /* kernel includes */
  38 #include <linux/usb.h>
  39 #include <linux/hid.h>
  40 #include <linux/slab.h>
  41
  42 #include "radio-si470x.h"
  43
  44
  45 /* USB Device ID List */
  46 static struct usb_device_id si470x_usb_driver_id_table[] = {
  47         /* Silicon Labs USB FM Radio Reference Design */
  48         { USB_DEVICE_AND_INTERFACE_INFO(0x10c4, 0x818a, USB_CLASS_HID, 0, 0) },
  49         /* ADS/Tech FM Radio Receiver (formerly Instant FM Music) */
  50         { USB_DEVICE_AND_INTERFACE_INFO(0x06e1, 0xa155, USB_CLASS_HID, 0, 0) },
  51         /* KWorld USB FM Radio SnapMusic Mobile 700 (FM700) */
  52         { USB_DEVICE_AND_INTERFACE_INFO(0x1b80, 0xd700, USB_CLASS_HID, 0, 0) },
  53         /* Sanei Electric, Inc. FM USB Radio (sold as DealExtreme.com PCear) */
  54         { USB_DEVICE_AND_INTERFACE_INFO(0x10c5, 0x819a, USB_CLASS_HID, 0, 0) },
  55         /* Terminating entry */
  56         { }
  57 };
  58 MODULE_DEVICE_TABLE(usb, si470x_usb_driver_id_table);
  59
  60
  61
  62 /**************************************************************************
  63  * Module Parameters
  64  **************************************************************************/
  65
  66 /* Radio Nr */
  67 static int radio_nr = -1;
  68 module_param(radio_nr, int, 0444);
  69 MODULE_PARM_DESC(radio_nr, "Radio Nr");
  70
  71 /* USB timeout */
  72 static unsigned int usb_timeout = 500;
  73 module_param(usb_timeout, uint, 0644);
  74 MODULE_PARM_DESC(usb_timeout, "USB timeout (ms): *500*");
  75
  76 /* RDS buffer blocks */
  77 static unsigned int rds_buf = 100;
  78 module_param(rds_buf, uint, 0444);
  79 MODULE_PARM_DESC(rds_buf, "RDS buffer entries: *100*");
  80
  81 /* RDS maximum block errors */
  82 static unsigned short max_rds_errors = 1;
  83 /* 0 means   0  errors requiring correction */
  84 /* 1 means 1-2  errors requiring correction (used by original USBRadio.exe) */
  85 /* 2 means 3-5  errors requiring correction */
  86 /* 3 means   6+ errors or errors in checkword, correction not possible */
  87 module_param(max_rds_errors, ushort, 0644);
  88 MODULE_PARM_DESC(max_rds_errors, "RDS maximum block errors: *1*");
  89
  90
  91
  92 /**************************************************************************
  93  * USB HID Reports
  94  **************************************************************************/
  95
  96 /* Reports 1-16 give direct read/write access to the 16 Si470x registers */
  97 /* with the (REPORT_ID - 1) corresponding to the register address across USB */
  98 /* endpoint 0 using GET_REPORT and SET_REPORT */
  99 #define REGISTER_REPORT_SIZE    (RADIO_REGISTER_SIZE + 1)
 100 #define REGISTER_REPORT(reg)    ((reg) + 1)
 101
 102 /* Report 17 gives direct read/write access to the entire Si470x register */
 103 /* map across endpoint 0 using GET_REPORT and SET_REPORT */
 104 #define ENTIRE_REPORT_SIZE      (RADIO_REGISTER_NUM * RADIO_REGISTER_SIZE + 1)
 105 #define ENTIRE_REPORT           17
 106
 107 /* Report 18 is used to send the lowest 6 Si470x registers up the HID */
 108 /* interrupt endpoint 1 to Windows every 20 milliseconds for status */
 109 #define RDS_REPORT_SIZE         (RDS_REGISTER_NUM * RADIO_REGISTER_SIZE + 1)
 110 #define RDS_REPORT              18
 111
 112 /* Report 19: LED state */
 113 #define LED_REPORT_SIZE         3
 114 #define LED_REPORT              19
 115
 116 /* Report 19: stream */
 117 #define STREAM_REPORT_SIZE      3
 118 #define STREAM_REPORT           19
 119
 120 /* Report 20: scratch */
 121 #define SCRATCH_PAGE_SIZE       63
 122 #define SCRATCH_REPORT_SIZE     (SCRATCH_PAGE_SIZE + 1)
 123 #define SCRATCH_REPORT          20
 124
 125 /* Reports 19-22: flash upgrade of the C8051F321 */
 126 #define WRITE_REPORT_SIZE       4
 127 #define WRITE_REPORT            19
 128 #define FLASH_REPORT_SIZE       64
 129 #define FLASH_REPORT            20
 130 #define CRC_REPORT_SIZE         3
 131 #define CRC_REPORT              21
 132 #define RESPONSE_REPORT_SIZE    2
 133 #define RESPONSE_REPORT         22
 134
 135 /* Report 23: currently unused, but can accept 60 byte reports on the HID */
 136 /* interrupt out endpoint 2 every 1 millisecond */
 137 #define UNUSED_REPORT           23
 138
 139
 140
 141 /**************************************************************************
 142  * Software/Hardware Versions from Scratch Page
 143  **************************************************************************/
 144 #define RADIO_SW_VERSION_NOT_BOOTLOADABLE       6
 145 #define RADIO_SW_VERSION                        7
 146 #define RADIO_HW_VERSION                        1
 147
 148
 149
 150 /**************************************************************************
 151  * LED State Definitions
 152  **************************************************************************/
 153 #define LED_COMMAND             0x35
 154
 155 #define NO_CHANGE_LED           0x00
 156 #define ALL_COLOR_LED           0x01    /* streaming state */
 157 #define BLINK_GREEN_LED         0x02    /* connect state */
 158 #define BLINK_RED_LED           0x04
 159 #define BLINK_ORANGE_LED        0x10    /* disconnect state */
 160 #define SOLID_GREEN_LED         0x20    /* tuning/seeking state */
 161 #define SOLID_RED_LED           0x40    /* bootload state */
 162 #define SOLID_ORANGE_LED        0x80
 163
 164
 165
 166 /**************************************************************************
 167  * Stream State Definitions
 168  **************************************************************************/
 169 #define STREAM_COMMAND  0x36
 170 #define STREAM_VIDPID   0x00
 171 #define STREAM_AUDIO    0xff
 172
 173
 174
 175 /**************************************************************************
 176  * Bootloader / Flash Commands
 177  **************************************************************************/
 178
 179 /* unique id sent to bootloader and required to put into a bootload state */
 180 #define UNIQUE_BL_ID            0x34
 181
 182 /* mask for the flash data */
 183 #define FLASH_DATA_MASK         0x55
 184
 185 /* bootloader commands */
 186 #define GET_SW_VERSION_COMMAND  0x00
 187 #define SET_PAGE_COMMAND        0x01
 188 #define ERASE_PAGE_COMMAND      0x02
 189 #define WRITE_PAGE_COMMAND      0x03
 190 #define CRC_ON_PAGE_COMMAND     0x04
 191 #define READ_FLASH_BYTE_COMMAND 0x05
 192 #define RESET_DEVICE_COMMAND    0x06
 193 #define GET_HW_VERSION_COMMAND  0x07
 194 #define BLANK                   0xff
 195
 196 /* bootloader command responses */
 197 #define COMMAND_OK              0x01
 198 #define COMMAND_FAILED          0x02
 199 #define COMMAND_PENDING         0x03
 200
 201
 202
 203 /**************************************************************************
 204  * General Driver Functions - REGISTER_REPORTs
 205  **************************************************************************/
 206
 207 /*
 208  * si470x_get_report - receive a HID report
 209  */
 210 static int si470x_get_report(struct si470x_device *radio, void *buf, int size)
 211 {
 212         unsigned char *report = (unsigned char *) buf;
 213         int retval;
 214
 215         retval = usb_control_msg(radio->usbdev,
 216                 usb_rcvctrlpipe(radio->usbdev, 0),
 217                 HID_REQ_GET_REPORT,
 218                 USB_TYPE_CLASS | USB_RECIP_INTERFACE | USB_DIR_IN,
 219                 report[0], 2,
 220                 buf, size, usb_timeout);
 221
 222         if (retval < 0)
 223                 dev_warn(&radio->intf->dev,
 224                         "si470x_get_report: usb_control_msg returned %d\n",
 225                         retval);
 226         return retval;
 227 }
 228
 229
 230 /*
 231  * si470x_set_report - send a HID report
 232  */
 233 static int si470x_set_report(struct si470x_device *radio, void *buf, int size)
 234 {
 235         unsigned char *report = (unsigned char *) buf;
 236         int retval;
 237
 238         retval = usb_control_msg(radio->usbdev,
 239                 usb_sndctrlpipe(radio->usbdev, 0),
 240                 HID_REQ_SET_REPORT,
 241                 USB_TYPE_CLASS | USB_RECIP_INTERFACE | USB_DIR_OUT,
 242                 report[0], 2,
 243                 buf, size, usb_timeout);
 244
 245         if (retval < 0)
 246                 dev_warn(&radio->intf->dev,
 247                         "si470x_set_report: usb_control_msg returned %d\n",
 248                         retval);
 249         return retval;
 250 }
 251
 252
 253 /*
 254  * si470x_get_register - read register
 255  */
 256 int si470x_get_register(struct si470x_device *radio, int regnr)
 257 {
 258         unsigned char buf[REGISTER_REPORT_SIZE];
 259         int retval;
 260
 261         buf[0] = REGISTER_REPORT(regnr);
 262
 263         retval = si470x_get_report(radio, (void *) &buf, sizeof(buf));
 264
 265         if (retval >= 0)
 266                 radio->registers[regnr] = get_unaligned_be16(&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         unsigned char buf[REGISTER_REPORT_SIZE];
 278         int retval;
 279
 280         buf[0] = REGISTER_REPORT(regnr);
 281         put_unaligned_be16(radio->registers[regnr], &buf[1]);
 282
 283         retval = si470x_set_report(radio, (void *) &buf, sizeof(buf));
 284
 285         return (retval < 0) ? -EINVAL : 0;
 286 }
 287
 288
 289
 290 /**************************************************************************
 291  * General Driver Functions - ENTIRE_REPORT
 292  **************************************************************************/
 293
 294 /*
 295  * si470x_get_all_registers - read entire registers
 296  */
 297 static int si470x_get_all_registers(struct si470x_device *radio)
 298 {
 299         unsigned char buf[ENTIRE_REPORT_SIZE];
 300         int retval;
 301         unsigned char regnr;
 302
 303         buf[0] = ENTIRE_REPORT;
 304
 305         retval = si470x_get_report(radio, (void *) &buf, sizeof(buf));
 306
 307         if (retval >= 0)
 308                 for (regnr = 0; regnr < RADIO_REGISTER_NUM; regnr++)
 309                         radio->registers[regnr] = get_unaligned_be16(
 310                                 &buf[regnr * RADIO_REGISTER_SIZE + 1]);
 311
 312         return (retval < 0) ? -EINVAL : 0;
 313 }
 314
 315
 316
 317 /**************************************************************************
 318  * General Driver Functions - LED_REPORT
 319  **************************************************************************/
 320
 321 /*
 322  * si470x_set_led_state - sets the led state
 323  */
 324 static int si470x_set_led_state(struct si470x_device *radio,
 325                 unsigned char led_state)
 326 {
 327         unsigned char buf[LED_REPORT_SIZE];
 328         int retval;
 329
 330         buf[0] = LED_REPORT;
 331         buf[1] = LED_COMMAND;
 332         buf[2] = led_state;
 333
 334         retval = si470x_set_report(radio, (void *) &buf, sizeof(buf));
 335
 336         return (retval < 0) ? -EINVAL : 0;
 337 }
 338
 339
 340
 341 /**************************************************************************
 342  * General Driver Functions - SCRATCH_REPORT
 343  **************************************************************************/
 344
 345 /*
 346  * si470x_get_scratch_versions - gets the scratch page and version infos
 347  */
 348 static int si470x_get_scratch_page_versions(struct si470x_device *radio)
 349 {
 350         unsigned char buf[SCRATCH_REPORT_SIZE];
 351         int retval;
 352
 353         buf[0] = SCRATCH_REPORT;
 354
 355         retval = si470x_get_report(radio, (void *) &buf, sizeof(buf));
 356
 357         if (retval < 0)
 358                 dev_warn(&radio->intf->dev, "si470x_get_scratch: "
 359                         "si470x_get_report returned %d\n", retval);
 360         else {
 361                 radio->software_version = buf[1];
 362                 radio->hardware_version = buf[2];
 363         }
 364
 365         return (retval < 0) ? -EINVAL : 0;
 366 }
 367
 368
 369
 370 /**************************************************************************
 371  * General Driver Functions - DISCONNECT_CHECK
 372  **************************************************************************/
 373
 374 /*
 375  * si470x_disconnect_check - check whether radio disconnects
 376  */
 377 int si470x_disconnect_check(struct si470x_device *radio)
 378 {
 379         if (radio->disconnected)
 380                 return -EIO;
 381         else
 382                 return 0;
 383 }
 384
 385
 386
 387 /**************************************************************************
 388  * RDS Driver Functions
 389  **************************************************************************/
 390
 391 /*
 392  * si470x_int_in_callback - rds callback and processing function
 393  *
 394  * TODO: do we need to use mutex locks in some sections?
 395  */
 396 static void si470x_int_in_callback(struct urb *urb)
 397 {
 398         struct si470x_device *radio = urb->context;
 399         unsigned char buf[RDS_REPORT_SIZE];
 400         int retval;
 401         unsigned char regnr;
 402         unsigned char blocknum;
 403         unsigned short bler; /* rds block errors */
 404         unsigned short rds;
 405         unsigned char tmpbuf[3];
 406
 407         if (urb->status) {
 408                 if (urb->status == -ENOENT ||
 409                                 urb->status == -ECONNRESET ||
 410                                 urb->status == -ESHUTDOWN) {
 411                         return;
 412                 } else {
 413                         dev_warn(&radio->intf->dev,
 414                          "non-zero urb status (%d)\n", urb->status);
 415                         goto resubmit; /* Maybe we can recover. */
 416                 }
 417         }
 418
 419         /* safety checks */
 420         if (radio->disconnected)
 421                 return;
 422         if ((radio->registers[SYSCONFIG1] & SYSCONFIG1_RDS) == 0)
 423                 goto resubmit;
 424
 425         if (urb->actual_length > 0) {
 426                 /* Update RDS registers with URB data */
 427                 buf[0] = RDS_REPORT;
 428                 for (regnr = 0; regnr < RDS_REGISTER_NUM; regnr++)
 429                         radio->registers[STATUSRSSI + regnr] =
 430                             get_unaligned_be16(&radio->int_in_buffer[
 431                                 regnr * RADIO_REGISTER_SIZE + 1]);
 432                 /* get rds blocks */
 433                 if ((radio->registers[STATUSRSSI] & STATUSRSSI_RDSR) == 0) {
 434                         /* No RDS group ready, better luck next time */
 435                         goto resubmit;
 436                 }
 437                 if ((radio->registers[STATUSRSSI] & STATUSRSSI_RDSS) == 0) {
 438                         /* RDS decoder not synchronized */
 439                         goto resubmit;
 440                 }
 441                 for (blocknum = 0; blocknum < 4; blocknum++) {
 442                         switch (blocknum) {
 443                         default:
 444                                 bler = (radio->registers[STATUSRSSI] &
 445                                                 STATUSRSSI_BLERA) >> 9;
 446                                 rds = radio->registers[RDSA];
 447                                 break;
 448                         case 1:
 449                                 bler = (radio->registers[READCHAN] &
 450                                                 READCHAN_BLERB) >> 14;
 451                                 rds = radio->registers[RDSB];
 452                                 break;
 453                         case 2:
 454                                 bler = (radio->registers[READCHAN] &
 455                                                 READCHAN_BLERC) >> 12;
 456                                 rds = radio->registers[RDSC];
 457                                 break;
 458                         case 3:
 459                                 bler = (radio->registers[READCHAN] &
 460                                                 READCHAN_BLERD) >> 10;
 461                                 rds = radio->registers[RDSD];
 462                                 break;
 463                         };
 464
 465                         /* Fill the V4L2 RDS buffer */
 466                         put_unaligned_le16(rds, &tmpbuf);
 467                         tmpbuf[2] = blocknum;           /* offset name */
 468                         tmpbuf[2] |= blocknum << 3;     /* received offset */
 469                         if (bler > max_rds_errors)
 470                                 tmpbuf[2] |= 0x80; /* uncorrectable errors */
 471                         else if (bler > 0)
 472                                 tmpbuf[2] |= 0x40; /* corrected error(s) */
 473
 474                         /* copy RDS block to internal buffer */
 475                         memcpy(&radio->buffer[radio->wr_index], &tmpbuf, 3);
 476                         radio->wr_index += 3;
 477
 478                         /* wrap write pointer */
 479                         if (radio->wr_index >= radio->buf_size)
 480                                 radio->wr_index = 0;
 481
 482                         /* check for overflow */
 483                         if (radio->wr_index == radio->rd_index) {
 484                                 /* increment and wrap read pointer */
 485                                 radio->rd_index += 3;
 486                                 if (radio->rd_index >= radio->buf_size)
 487                                         radio->rd_index = 0;
 488                         }
 489                 }
 490                 if (radio->wr_index != radio->rd_index)
 491                         wake_up_interruptible(&radio->read_queue);
 492         }
 493
 494 resubmit:
 495         /* Resubmit if we're still running. */
 496         if (radio->int_in_running && radio->usbdev) {
 497                 retval = usb_submit_urb(radio->int_in_urb, GFP_ATOMIC);
 498                 if (retval) {
 499                         dev_warn(&radio->intf->dev,
 500                                "resubmitting urb failed (%d)", retval);
 501                         radio->int_in_running = 0;
 502                 }
 503         }
 504 }
 505
 506
 507
 508 /**************************************************************************
 509  * File Operations Interface
 510  **************************************************************************/
 511
 512 /*
 513  * si470x_fops_open - file open
 514  */
 515 int si470x_fops_open(struct file *file)
 516 {
 517         struct si470x_device *radio = video_drvdata(file);
 518         int retval;
 519
 520         mutex_lock(&radio->lock);
 521         radio->users++;
 522
 523         retval = usb_autopm_get_interface(radio->intf);
 524         if (retval < 0) {
 525                 radio->users--;
 526                 retval = -EIO;
 527                 goto done;
 528         }
 529
 530         if (radio->users == 1) {
 531                 /* start radio */
 532                 retval = si470x_start(radio);
 533                 if (retval < 0) {
 534                         usb_autopm_put_interface(radio->intf);
 535                         goto done;
 536                 }
 537
 538                 /* initialize interrupt urb */
 539                 usb_fill_int_urb(radio->int_in_urb, radio->usbdev,
 540                         usb_rcvintpipe(radio->usbdev,
 541                         radio->int_in_endpoint->bEndpointAddress),
 542                         radio->int_in_buffer,
 543                         le16_to_cpu(radio->int_in_endpoint->wMaxPacketSize),
 544                         si470x_int_in_callback,
 545                         radio,
 546                         radio->int_in_endpoint->bInterval);
 547
 548                 radio->int_in_running = 1;
 549                 mb();
 550
 551                 retval = usb_submit_urb(radio->int_in_urb, GFP_KERNEL);
 552                 if (retval) {
 553                         dev_info(&radio->intf->dev,
 554                                  "submitting int urb failed (%d)\n", retval);
 555                         radio->int_in_running = 0;
 556                         usb_autopm_put_interface(radio->intf);
 557                 }
 558         }
 559
 560 done:
 561         mutex_unlock(&radio->lock);
 562         return retval;
 563 }
 564
 565
 566 /*
 567  * si470x_fops_release - file release
 568  */
 569 int si470x_fops_release(struct file *file)
 570 {
 571         struct si470x_device *radio = video_drvdata(file);
 572         int retval = 0;
 573
 574         /* safety check */
 575         if (!radio) {
 576                 retval = -ENODEV;
 577                 goto done;
 578         }
 579
 580         mutex_lock(&radio->lock);
 581         radio->users--;
 582         if (radio->users == 0) {
 583                 /* shutdown interrupt handler */
 584                 if (radio->int_in_running) {
 585                         radio->int_in_running = 0;
 586                 if (radio->int_in_urb)
 587                         usb_kill_urb(radio->int_in_urb);
 588                 }
 589
 590                 if (radio->disconnected) {
 591                         video_unregister_device(radio->videodev);
 592                         kfree(radio->int_in_buffer);
 593                         kfree(radio->buffer);
 594                         mutex_unlock(&radio->lock);
 595                         kfree(radio);
 596                         goto done;
 597                 }
 598
 599                 /* cancel read processes */
 600                 wake_up_interruptible(&radio->read_queue);
 601
 602                 /* stop radio */
 603                 retval = si470x_stop(radio);
 604                 usb_autopm_put_interface(radio->intf);
 605         }
 606         mutex_unlock(&radio->lock);
 607 done:
 608         return retval;
 609 }
 610
 611
 612
 613 /**************************************************************************
 614  * Video4Linux Interface
 615  **************************************************************************/
 616
 617 /*
 618  * si470x_vidioc_querycap - query device capabilities
 619  */
 620 int si470x_vidioc_querycap(struct file *file, void *priv,
 621                 struct v4l2_capability *capability)
 622 {
 623         struct si470x_device *radio = video_drvdata(file);
 624
 625         strlcpy(capability->driver, DRIVER_NAME, sizeof(capability->driver));
 626         strlcpy(capability->card, DRIVER_CARD, sizeof(capability->card));
 627         usb_make_path(radio->usbdev, capability->bus_info,
 628                         sizeof(capability->bus_info));
 629         capability->version = DRIVER_KERNEL_VERSION;
 630         capability->capabilities = V4L2_CAP_HW_FREQ_SEEK |
 631                 V4L2_CAP_TUNER | V4L2_CAP_RADIO | V4L2_CAP_RDS_CAPTURE;
 632
 633         return 0;
 634 }
 635
 636
 637
 638 /**************************************************************************
 639  * USB Interface
 640  **************************************************************************/
 641
 642 /*
 643  * si470x_usb_driver_probe - probe for the device
 644  */
 645 static int si470x_usb_driver_probe(struct usb_interface *intf,
 646                 const struct usb_device_id *id)
 647 {
 648         struct si470x_device *radio;
 649         struct usb_host_interface *iface_desc;
 650         struct usb_endpoint_descriptor *endpoint;
 651         int i, int_end_size, retval = 0;
 652         unsigned char version_warning = 0;
 653
 654         /* private data allocation and initialization */
 655         radio = kzalloc(sizeof(struct si470x_device), GFP_KERNEL);
 656         if (!radio) {
 657                 retval = -ENOMEM;
 658                 goto err_initial;
 659         }
 660         radio->users = 0;
 661         radio->disconnected = 0;
 662         radio->usbdev = interface_to_usbdev(intf);
 663         radio->intf = intf;
 664         mutex_init(&radio->lock);
 665
 666         iface_desc = intf->cur_altsetting;
 667
 668         /* Set up interrupt endpoint information. */
 669         for (i = 0; i < iface_desc->desc.bNumEndpoints; ++i) {
 670                 endpoint = &iface_desc->endpoint[i].desc;
 671                 if (((endpoint->bEndpointAddress & USB_ENDPOINT_DIR_MASK) ==
 672                  USB_DIR_IN) && ((endpoint->bmAttributes &
 673                  USB_ENDPOINT_XFERTYPE_MASK) == USB_ENDPOINT_XFER_INT))
 674                         radio->int_in_endpoint = endpoint;
 675         }
 676         if (!radio->int_in_endpoint) {
 677                 dev_info(&intf->dev, "could not find interrupt in endpoint\n");
 678                 retval = -EIO;
 679                 goto err_radio;
 680         }
 681
 682         int_end_size = le16_to_cpu(radio->int_in_endpoint->wMaxPacketSize);
 683
 684         radio->int_in_buffer = kmalloc(int_end_size, GFP_KERNEL);
 685         if (!radio->int_in_buffer) {
 686                 dev_info(&intf->dev, "could not allocate int_in_buffer");
 687                 retval = -ENOMEM;
 688                 goto err_radio;
 689         }
 690
 691         radio->int_in_urb = usb_alloc_urb(0, GFP_KERNEL);
 692         if (!radio->int_in_urb) {
 693                 dev_info(&intf->dev, "could not allocate int_in_urb");
 694                 retval = -ENOMEM;
 695                 goto err_intbuffer;
 696         }
 697
 698         /* video device allocation and initialization */
 699         radio->videodev = video_device_alloc();
 700         if (!radio->videodev) {
 701                 retval = -ENOMEM;
 702                 goto err_intbuffer;
 703         }
 704         memcpy(radio->videodev, &si470x_viddev_template,
 705                         sizeof(si470x_viddev_template));
 706         video_set_drvdata(radio->videodev, radio);
 707
 708         /* get device and chip versions */
 709         if (si470x_get_all_registers(radio) < 0) {
 710                 retval = -EIO;
 711                 goto err_video;
 712         }
 713         dev_info(&intf->dev, "DeviceID=0x%4.4hx ChipID=0x%4.4hx\n",
 714                         radio->registers[DEVICEID], radio->registers[CHIPID]);
 715         if ((radio->registers[CHIPID] & CHIPID_FIRMWARE) < RADIO_FW_VERSION) {
 716                 dev_warn(&intf->dev,
 717                         "This driver is known to work with "
 718                         "firmware version %hu,\n", RADIO_FW_VERSION);
 719                 dev_warn(&intf->dev,
 720                         "but the device has firmware version %hu.\n",
 721                         radio->registers[CHIPID] & CHIPID_FIRMWARE);
 722                 version_warning = 1;
 723         }
 724
 725         /* get software and hardware versions */
 726         if (si470x_get_scratch_page_versions(radio) < 0) {
 727                 retval = -EIO;
 728                 goto err_video;
 729         }
 730         dev_info(&intf->dev, "software version %d, hardware version %d\n",
 731                         radio->software_version, radio->hardware_version);
 732         if (radio->software_version < RADIO_SW_VERSION) {
 733                 dev_warn(&intf->dev,
 734                         "This driver is known to work with "
 735                         "software version %hu,\n", RADIO_SW_VERSION);
 736                 dev_warn(&intf->dev,
 737                         "but the device has software version %hu.\n",
 738                         radio->software_version);
 739                 version_warning = 1;
 740         }
 741         if (radio->hardware_version < RADIO_HW_VERSION) {
 742                 dev_warn(&intf->dev,
 743                         "This driver is known to work with "
 744                         "hardware version %hu,\n", RADIO_HW_VERSION);
 745                 dev_warn(&intf->dev,
 746                         "but the device has hardware version %hu.\n",
 747                         radio->hardware_version);
 748                 version_warning = 1;
 749         }
 750
 751         /* give out version warning */
 752         if (version_warning == 1) {
 753                 dev_warn(&intf->dev,
 754                         "If you have some trouble using this driver,\n");
 755                 dev_warn(&intf->dev,
 756                         "please report to V4L ML at "
 757                         "linux-media@vger.kernel.org\n");
 758         }
 759
 760         /* set initial frequency */
 761         si470x_set_freq(radio, 87.5 * FREQ_MUL); /* available in all regions */
 762
 763         /* set led to connect state */
 764         si470x_set_led_state(radio, BLINK_GREEN_LED);
 765
 766         /* rds buffer allocation */
 767         radio->buf_size = rds_buf * 3;
 768         radio->buffer = kmalloc(radio->buf_size, GFP_KERNEL);
 769         if (!radio->buffer) {
 770                 retval = -EIO;
 771                 goto err_video;
 772         }
 773
 774         /* rds buffer configuration */
 775         radio->wr_index = 0;
 776         radio->rd_index = 0;
 777         init_waitqueue_head(&radio->read_queue);
 778
 779         /* register video device */
 780         retval = video_register_device(radio->videodev, VFL_TYPE_RADIO,
 781                         radio_nr);
 782         if (retval) {
 783                 dev_warn(&intf->dev, "Could not register video device\n");
 784                 goto err_all;
 785         }
 786         usb_set_intfdata(intf, radio);
 787
 788         return 0;
 789 err_all:
 790         kfree(radio->buffer);
 791 err_video:
 792         video_device_release(radio->videodev);
 793 err_intbuffer:
 794         kfree(radio->int_in_buffer);
 795 err_radio:
 796         kfree(radio);
 797 err_initial:
 798         return retval;
 799 }
 800
 801
 802 /*
 803  * si470x_usb_driver_suspend - suspend the device
 804  */
 805 static int si470x_usb_driver_suspend(struct usb_interface *intf,
 806                 pm_message_t message)
 807 {
 808         dev_info(&intf->dev, "suspending now...\n");
 809
 810         return 0;
 811 }
 812
 813
 814 /*
 815  * si470x_usb_driver_resume - resume the device
 816  */
 817 static int si470x_usb_driver_resume(struct usb_interface *intf)
 818 {
 819         dev_info(&intf->dev, "resuming now...\n");
 820
 821         return 0;
 822 }
 823
 824
 825 /*
 826  * si470x_usb_driver_disconnect - disconnect the device
 827  */
 828 static void si470x_usb_driver_disconnect(struct usb_interface *intf)
 829 {
 830         struct si470x_device *radio = usb_get_intfdata(intf);
 831
 832         mutex_lock(&radio->lock);
 833         radio->disconnected = 1;
 834         usb_set_intfdata(intf, NULL);
 835         if (radio->users == 0) {
 836                 /* set led to disconnect state */
 837                 si470x_set_led_state(radio, BLINK_ORANGE_LED);
 838
 839                 /* Free data structures. */
 840                 usb_free_urb(radio->int_in_urb);
 841
 842                 kfree(radio->int_in_buffer);
 843                 video_unregister_device(radio->videodev);
 844                 kfree(radio->buffer);
 845                 mutex_unlock(&radio->lock);
 846                 kfree(radio);
 847         } else {
 848                 mutex_unlock(&radio->lock);
 849         }
 850 }
 851
 852
 853 /*
 854  * si470x_usb_driver - usb driver interface
 855  */
 856 static struct usb_driver si470x_usb_driver = {
 857         .name                   = DRIVER_NAME,
 858         .probe                  = si470x_usb_driver_probe,
 859         .disconnect             = si470x_usb_driver_disconnect,
 860         .suspend                = si470x_usb_driver_suspend,
 861         .resume                 = si470x_usb_driver_resume,
 862         .id_table               = si470x_usb_driver_id_table,
 863         .supports_autosuspend   = 1,
 864 };
 865
 866
 867
 868 /**************************************************************************
 869  * Module Interface
 870  **************************************************************************/
 871
 872 /*
 873  * si470x_module_init - module init
 874  */
 875 static int __init si470x_module_init(void)
 876 {
 877         printk(KERN_INFO DRIVER_DESC ", Version " DRIVER_VERSION "\n");
 878         return usb_register(&si470x_usb_driver);
 879 }
 880
 881
 882 /*
 883  * si470x_module_exit - module exit
 884  */
 885 static void __exit si470x_module_exit(void)
 886 {
 887         usb_deregister(&si470x_usb_driver);
 888 }
 889
 890
 891 module_init(si470x_module_init);
 892 module_exit(si470x_module_exit);
 893
 894 MODULE_LICENSE("GPL");
 895 MODULE_AUTHOR(DRIVER_AUTHOR);
 896 MODULE_DESCRIPTION(DRIVER_DESC);
 897 MODULE_VERSION(DRIVER_VERSION);