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         /* Terminating entry */
  55         { }
  56 };
  57 MODULE_DEVICE_TABLE(usb, si470x_usb_driver_id_table);
  58
  59
  60
  61 /**************************************************************************
  62  * Module Parameters
  63  **************************************************************************/
  64
  65 /* Radio Nr */
  66 static int radio_nr = -1;
  67 module_param(radio_nr, int, 0444);
  68 MODULE_PARM_DESC(radio_nr, "Radio Nr");
  69
  70 /* USB timeout */
  71 static unsigned int usb_timeout = 500;
  72 module_param(usb_timeout, uint, 0644);
  73 MODULE_PARM_DESC(usb_timeout, "USB timeout (ms): *500*");
  74
  75 /* RDS buffer blocks */
  76 static unsigned int rds_buf = 100;
  77 module_param(rds_buf, uint, 0444);
  78 MODULE_PARM_DESC(rds_buf, "RDS buffer entries: *100*");
  79
  80 /* RDS maximum block errors */
  81 static unsigned short max_rds_errors = 1;
  82 /* 0 means   0  errors requiring correction */
  83 /* 1 means 1-2  errors requiring correction (used by original USBRadio.exe) */
  84 /* 2 means 3-5  errors requiring correction */
  85 /* 3 means   6+ errors or errors in checkword, correction not possible */
  86 module_param(max_rds_errors, ushort, 0644);
  87 MODULE_PARM_DESC(max_rds_errors, "RDS maximum block errors: *1*");
  88
  89
  90
  91 /**************************************************************************
  92  * USB HID Reports
  93  **************************************************************************/
  94
  95 /* Reports 1-16 give direct read/write access to the 16 Si470x registers */
  96 /* with the (REPORT_ID - 1) corresponding to the register address across USB */
  97 /* endpoint 0 using GET_REPORT and SET_REPORT */
  98 #define REGISTER_REPORT_SIZE    (RADIO_REGISTER_SIZE + 1)
  99 #define REGISTER_REPORT(reg)    ((reg) + 1)
 100
 101 /* Report 17 gives direct read/write access to the entire Si470x register */
 102 /* map across endpoint 0 using GET_REPORT and SET_REPORT */
 103 #define ENTIRE_REPORT_SIZE      (RADIO_REGISTER_NUM * RADIO_REGISTER_SIZE + 1)
 104 #define ENTIRE_REPORT           17
 105
 106 /* Report 18 is used to send the lowest 6 Si470x registers up the HID */
 107 /* interrupt endpoint 1 to Windows every 20 milliseconds for status */
 108 #define RDS_REPORT_SIZE         (RDS_REGISTER_NUM * RADIO_REGISTER_SIZE + 1)
 109 #define RDS_REPORT              18
 110
 111 /* Report 19: LED state */
 112 #define LED_REPORT_SIZE         3
 113 #define LED_REPORT              19
 114
 115 /* Report 19: stream */
 116 #define STREAM_REPORT_SIZE      3
 117 #define STREAM_REPORT           19
 118
 119 /* Report 20: scratch */
 120 #define SCRATCH_PAGE_SIZE       63
 121 #define SCRATCH_REPORT_SIZE     (SCRATCH_PAGE_SIZE + 1)
 122 #define SCRATCH_REPORT          20
 123
 124 /* Reports 19-22: flash upgrade of the C8051F321 */
 125 #define WRITE_REPORT_SIZE       4
 126 #define WRITE_REPORT            19
 127 #define FLASH_REPORT_SIZE       64
 128 #define FLASH_REPORT            20
 129 #define CRC_REPORT_SIZE         3
 130 #define CRC_REPORT              21
 131 #define RESPONSE_REPORT_SIZE    2
 132 #define RESPONSE_REPORT         22
 133
 134 /* Report 23: currently unused, but can accept 60 byte reports on the HID */
 135 /* interrupt out endpoint 2 every 1 millisecond */
 136 #define UNUSED_REPORT           23
 137
 138
 139
 140 /**************************************************************************
 141  * Software/Hardware Versions from Scratch Page
 142  **************************************************************************/
 143 #define RADIO_SW_VERSION_NOT_BOOTLOADABLE       6
 144 #define RADIO_SW_VERSION                        7
 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  * General Driver Functions - DISCONNECT_CHECK
 371  **************************************************************************/
 372
 373 /*
 374  * si470x_disconnect_check - check whether radio disconnects
 375  */
 376 int si470x_disconnect_check(struct si470x_device *radio)
 377 {
 378         if (radio->disconnected)
 379                 return -EIO;
 380         else
 381                 return 0;
 382 }
 383
 384
 385
 386 /**************************************************************************
 387  * RDS Driver Functions
 388  **************************************************************************/
 389
 390 /*
 391  * si470x_int_in_callback - rds callback and processing function
 392  *
 393  * TODO: do we need to use mutex locks in some sections?
 394  */
 395 static void si470x_int_in_callback(struct urb *urb)
 396 {
 397         struct si470x_device *radio = urb->context;
 398         int retval;
 399         unsigned char regnr;
 400         unsigned char blocknum;
 401         unsigned short bler; /* rds block errors */
 402         unsigned short rds;
 403         unsigned char tmpbuf[3];
 404
 405         if (urb->status) {
 406                 if (urb->status == -ENOENT ||
 407                                 urb->status == -ECONNRESET ||
 408                                 urb->status == -ESHUTDOWN) {
 409                         return;
 410                 } else {
 411                         dev_warn(&radio->intf->dev,
 412                          "non-zero urb status (%d)\n", urb->status);
 413                         goto resubmit; /* Maybe we can recover. */
 414                 }
 415         }
 416
 417         /* safety checks */
 418         if (radio->disconnected)
 419                 return;
 420         if ((radio->registers[SYSCONFIG1] & SYSCONFIG1_RDS) == 0)
 421                 goto resubmit;
 422
 423         if (urb->actual_length > 0) {
 424                 /* Update RDS registers with URB data */
 425                 for (regnr = 0; regnr < RDS_REGISTER_NUM; regnr++)
 426                         radio->registers[STATUSRSSI + regnr] =
 427                             get_unaligned_be16(&radio->int_in_buffer[
 428                                 regnr * RADIO_REGISTER_SIZE + 1]);
 429                 /* get rds blocks */
 430                 if ((radio->registers[STATUSRSSI] & STATUSRSSI_RDSR) == 0) {
 431                         /* No RDS group ready, better luck next time */
 432                         goto resubmit;
 433                 }
 434                 if ((radio->registers[STATUSRSSI] & STATUSRSSI_RDSS) == 0) {
 435                         /* RDS decoder not synchronized */
 436                         goto resubmit;
 437                 }
 438                 for (blocknum = 0; blocknum < 4; blocknum++) {
 439                         switch (blocknum) {
 440                         default:
 441                                 bler = (radio->registers[STATUSRSSI] &
 442                                                 STATUSRSSI_BLERA) >> 9;
 443                                 rds = radio->registers[RDSA];
 444                                 break;
 445                         case 1:
 446                                 bler = (radio->registers[READCHAN] &
 447                                                 READCHAN_BLERB) >> 14;
 448                                 rds = radio->registers[RDSB];
 449                                 break;
 450                         case 2:
 451                                 bler = (radio->registers[READCHAN] &
 452                                                 READCHAN_BLERC) >> 12;
 453                                 rds = radio->registers[RDSC];
 454                                 break;
 455                         case 3:
 456                                 bler = (radio->registers[READCHAN] &
 457                                                 READCHAN_BLERD) >> 10;
 458                                 rds = radio->registers[RDSD];
 459                                 break;
 460                         };
 461
 462                         /* Fill the V4L2 RDS buffer */
 463                         put_unaligned_le16(rds, &tmpbuf);
 464                         tmpbuf[2] = blocknum;           /* offset name */
 465                         tmpbuf[2] |= blocknum << 3;     /* received offset */
 466                         if (bler > max_rds_errors)
 467                                 tmpbuf[2] |= 0x80; /* uncorrectable errors */
 468                         else if (bler > 0)
 469                                 tmpbuf[2] |= 0x40; /* corrected error(s) */
 470
 471                         /* copy RDS block to internal buffer */
 472                         memcpy(&radio->buffer[radio->wr_index], &tmpbuf, 3);
 473                         radio->wr_index += 3;
 474
 475                         /* wrap write pointer */
 476                         if (radio->wr_index >= radio->buf_size)
 477                                 radio->wr_index = 0;
 478
 479                         /* check for overflow */
 480                         if (radio->wr_index == radio->rd_index) {
 481                                 /* increment and wrap read pointer */
 482                                 radio->rd_index += 3;
 483                                 if (radio->rd_index >= radio->buf_size)
 484                                         radio->rd_index = 0;
 485                         }
 486                 }
 487                 if (radio->wr_index != radio->rd_index)
 488                         wake_up_interruptible(&radio->read_queue);
 489         }
 490
 491 resubmit:
 492         /* Resubmit if we're still running. */
 493         if (radio->int_in_running && radio->usbdev) {
 494                 retval = usb_submit_urb(radio->int_in_urb, GFP_ATOMIC);
 495                 if (retval) {
 496                         dev_warn(&radio->intf->dev,
 497                                "resubmitting urb failed (%d)", retval);
 498                         radio->int_in_running = 0;
 499                 }
 500         }
 501 }
 502
 503
 504
 505 /**************************************************************************
 506  * File Operations Interface
 507  **************************************************************************/
 508
 509 /*
 510  * si470x_fops_open - file open
 511  */
 512 int si470x_fops_open(struct file *file)
 513 {
 514         struct si470x_device *radio = video_drvdata(file);
 515         int retval;
 516
 517         mutex_lock(&radio->lock);
 518         radio->users++;
 519
 520         retval = usb_autopm_get_interface(radio->intf);
 521         if (retval < 0) {
 522                 radio->users--;
 523                 retval = -EIO;
 524                 goto done;
 525         }
 526
 527         if (radio->users == 1) {
 528                 /* start radio */
 529                 retval = si470x_start(radio);
 530                 if (retval < 0) {
 531                         usb_autopm_put_interface(radio->intf);
 532                         goto done;
 533                 }
 534
 535                 /* initialize interrupt urb */
 536                 usb_fill_int_urb(radio->int_in_urb, radio->usbdev,
 537                         usb_rcvintpipe(radio->usbdev,
 538                         radio->int_in_endpoint->bEndpointAddress),
 539                         radio->int_in_buffer,
 540                         le16_to_cpu(radio->int_in_endpoint->wMaxPacketSize),
 541                         si470x_int_in_callback,
 542                         radio,
 543                         radio->int_in_endpoint->bInterval);
 544
 545                 radio->int_in_running = 1;
 546                 mb();
 547
 548                 retval = usb_submit_urb(radio->int_in_urb, GFP_KERNEL);
 549                 if (retval) {
 550                         dev_info(&radio->intf->dev,
 551                                  "submitting int urb failed (%d)\n", retval);
 552                         radio->int_in_running = 0;
 553                         usb_autopm_put_interface(radio->intf);
 554                 }
 555         }
 556
 557 done:
 558         mutex_unlock(&radio->lock);
 559         return retval;
 560 }
 561
 562
 563 /*
 564  * si470x_fops_release - file release
 565  */
 566 int si470x_fops_release(struct file *file)
 567 {
 568         struct si470x_device *radio = video_drvdata(file);
 569         int retval = 0;
 570
 571         /* safety check */
 572         if (!radio) {
 573                 retval = -ENODEV;
 574                 goto done;
 575         }
 576
 577         mutex_lock(&radio->lock);
 578         radio->users--;
 579         if (radio->users == 0) {
 580                 /* shutdown interrupt handler */
 581                 if (radio->int_in_running) {
 582                         radio->int_in_running = 0;
 583                 if (radio->int_in_urb)
 584                         usb_kill_urb(radio->int_in_urb);
 585                 }
 586
 587                 if (radio->disconnected) {
 588                         video_unregister_device(radio->videodev);
 589                         kfree(radio->int_in_buffer);
 590                         kfree(radio->buffer);
 591                         mutex_unlock(&radio->lock);
 592                         kfree(radio);
 593                         goto done;
 594                 }
 595
 596                 /* cancel read processes */
 597                 wake_up_interruptible(&radio->read_queue);
 598
 599                 /* stop radio */
 600                 retval = si470x_stop(radio);
 601                 usb_autopm_put_interface(radio->intf);
 602         }
 603         mutex_unlock(&radio->lock);
 604 done:
 605         return retval;
 606 }
 607
 608
 609
 610 /**************************************************************************
 611  * Video4Linux Interface
 612  **************************************************************************/
 613
 614 /*
 615  * si470x_vidioc_querycap - query device capabilities
 616  */
 617 int si470x_vidioc_querycap(struct file *file, void *priv,
 618                 struct v4l2_capability *capability)
 619 {
 620         struct si470x_device *radio = video_drvdata(file);
 621
 622         strlcpy(capability->driver, DRIVER_NAME, sizeof(capability->driver));
 623         strlcpy(capability->card, DRIVER_CARD, sizeof(capability->card));
 624         usb_make_path(radio->usbdev, capability->bus_info,
 625                         sizeof(capability->bus_info));
 626         capability->capabilities = V4L2_CAP_HW_FREQ_SEEK |
 627                 V4L2_CAP_TUNER | V4L2_CAP_RADIO | V4L2_CAP_RDS_CAPTURE;
 628
 629         return 0;
 630 }
 631
 632
 633
 634 /**************************************************************************
 635  * USB Interface
 636  **************************************************************************/
 637
 638 /*
 639  * si470x_usb_driver_probe - probe for the device
 640  */
 641 static int si470x_usb_driver_probe(struct usb_interface *intf,
 642                 const struct usb_device_id *id)
 643 {
 644         struct si470x_device *radio;
 645         struct usb_host_interface *iface_desc;
 646         struct usb_endpoint_descriptor *endpoint;
 647         int i, int_end_size, retval = 0;
 648         unsigned char version_warning = 0;
 649
 650         /* private data allocation and initialization */
 651         radio = kzalloc(sizeof(struct si470x_device), GFP_KERNEL);
 652         if (!radio) {
 653                 retval = -ENOMEM;
 654                 goto err_initial;
 655         }
 656         radio->users = 0;
 657         radio->disconnected = 0;
 658         radio->usbdev = interface_to_usbdev(intf);
 659         radio->intf = intf;
 660         mutex_init(&radio->lock);
 661
 662         iface_desc = intf->cur_altsetting;
 663
 664         /* Set up interrupt endpoint information. */
 665         for (i = 0; i < iface_desc->desc.bNumEndpoints; ++i) {
 666                 endpoint = &iface_desc->endpoint[i].desc;
 667                 if (((endpoint->bEndpointAddress & USB_ENDPOINT_DIR_MASK) ==
 668                  USB_DIR_IN) && ((endpoint->bmAttributes &
 669                  USB_ENDPOINT_XFERTYPE_MASK) == USB_ENDPOINT_XFER_INT))
 670                         radio->int_in_endpoint = endpoint;
 671         }
 672         if (!radio->int_in_endpoint) {
 673                 dev_info(&intf->dev, "could not find interrupt in endpoint\n");
 674                 retval = -EIO;
 675                 goto err_radio;
 676         }
 677
 678         int_end_size = le16_to_cpu(radio->int_in_endpoint->wMaxPacketSize);
 679
 680         radio->int_in_buffer = kmalloc(int_end_size, GFP_KERNEL);
 681         if (!radio->int_in_buffer) {
 682                 dev_info(&intf->dev, "could not allocate int_in_buffer");
 683                 retval = -ENOMEM;
 684                 goto err_radio;
 685         }
 686
 687         radio->int_in_urb = usb_alloc_urb(0, GFP_KERNEL);
 688         if (!radio->int_in_urb) {
 689                 dev_info(&intf->dev, "could not allocate int_in_urb");
 690                 retval = -ENOMEM;
 691                 goto err_intbuffer;
 692         }
 693
 694         /* video device allocation and initialization */
 695         radio->videodev = video_device_alloc();
 696         if (!radio->videodev) {
 697                 retval = -ENOMEM;
 698                 goto err_urb;
 699         }
 700         memcpy(radio->videodev, &si470x_viddev_template,
 701                         sizeof(si470x_viddev_template));
 702         video_set_drvdata(radio->videodev, radio);
 703
 704         /* get device and chip versions */
 705         if (si470x_get_all_registers(radio) < 0) {
 706                 retval = -EIO;
 707                 goto err_video;
 708         }
 709         dev_info(&intf->dev, "DeviceID=0x%4.4hx ChipID=0x%4.4hx\n",
 710                         radio->registers[DEVICEID], radio->registers[CHIPID]);
 711         if ((radio->registers[CHIPID] & CHIPID_FIRMWARE) < RADIO_FW_VERSION) {
 712                 dev_warn(&intf->dev,
 713                         "This driver is known to work with "
 714                         "firmware version %hu,\n", RADIO_FW_VERSION);
 715                 dev_warn(&intf->dev,
 716                         "but the device has firmware version %hu.\n",
 717                         radio->registers[CHIPID] & CHIPID_FIRMWARE);
 718                 version_warning = 1;
 719         }
 720
 721         /* get software and hardware versions */
 722         if (si470x_get_scratch_page_versions(radio) < 0) {
 723                 retval = -EIO;
 724                 goto err_video;
 725         }
 726         dev_info(&intf->dev, "software version %d, hardware version %d\n",
 727                         radio->software_version, radio->hardware_version);
 728         if (radio->software_version < RADIO_SW_VERSION) {
 729                 dev_warn(&intf->dev,
 730                         "This driver is known to work with "
 731                         "software version %hu,\n", RADIO_SW_VERSION);
 732                 dev_warn(&intf->dev,
 733                         "but the device has software version %hu.\n",
 734                         radio->software_version);
 735                 version_warning = 1;
 736         }
 737         if (radio->hardware_version < RADIO_HW_VERSION) {
 738                 dev_warn(&intf->dev,
 739                         "This driver is known to work with "
 740                         "hardware version %hu,\n", RADIO_HW_VERSION);
 741                 dev_warn(&intf->dev,
 742                         "but the device has hardware version %hu.\n",
 743                         radio->hardware_version);
 744                 version_warning = 1;
 745         }
 746
 747         /* give out version warning */
 748         if (version_warning == 1) {
 749                 dev_warn(&intf->dev,
 750                         "If you have some trouble using this driver,\n");
 751                 dev_warn(&intf->dev,
 752                         "please report to V4L ML at "
 753                         "linux-media@vger.kernel.org\n");
 754         }
 755
 756         /* set initial frequency */
 757         si470x_set_freq(radio, 87.5 * FREQ_MUL); /* available in all regions */
 758
 759         /* set led to connect state */
 760         si470x_set_led_state(radio, BLINK_GREEN_LED);
 761
 762         /* rds buffer allocation */
 763         radio->buf_size = rds_buf * 3;
 764         radio->buffer = kmalloc(radio->buf_size, GFP_KERNEL);
 765         if (!radio->buffer) {
 766                 retval = -EIO;
 767                 goto err_video;
 768         }
 769
 770         /* rds buffer configuration */
 771         radio->wr_index = 0;
 772         radio->rd_index = 0;
 773         init_waitqueue_head(&radio->read_queue);
 774
 775         /* register video device */
 776         retval = video_register_device(radio->videodev, VFL_TYPE_RADIO,
 777                         radio_nr);
 778         if (retval) {
 779                 dev_warn(&intf->dev, "Could not register video device\n");
 780                 goto err_all;
 781         }
 782         usb_set_intfdata(intf, radio);
 783
 784         return 0;
 785 err_all:
 786         kfree(radio->buffer);
 787 err_video:
 788         video_device_release(radio->videodev);
 789 err_urb:
 790         usb_free_urb(radio->int_in_urb);
 791 err_intbuffer:
 792         kfree(radio->int_in_buffer);
 793 err_radio:
 794         kfree(radio);
 795 err_initial:
 796         return retval;
 797 }
 798
 799
 800 /*
 801  * si470x_usb_driver_suspend - suspend the device
 802  */
 803 static int si470x_usb_driver_suspend(struct usb_interface *intf,
 804                 pm_message_t message)
 805 {
 806         dev_info(&intf->dev, "suspending now...\n");
 807
 808         return 0;
 809 }
 810
 811
 812 /*
 813  * si470x_usb_driver_resume - resume the device
 814  */
 815 static int si470x_usb_driver_resume(struct usb_interface *intf)
 816 {
 817         dev_info(&intf->dev, "resuming now...\n");
 818
 819         return 0;
 820 }
 821
 822
 823 /*
 824  * si470x_usb_driver_disconnect - disconnect the device
 825  */
 826 static void si470x_usb_driver_disconnect(struct usb_interface *intf)
 827 {
 828         struct si470x_device *radio = usb_get_intfdata(intf);
 829
 830         mutex_lock(&radio->lock);
 831         radio->disconnected = 1;
 832         usb_set_intfdata(intf, NULL);
 833         if (radio->users == 0) {
 834                 /* set led to disconnect state */
 835                 si470x_set_led_state(radio, BLINK_ORANGE_LED);
 836
 837                 /* Free data structures. */
 838                 usb_free_urb(radio->int_in_urb);
 839
 840                 kfree(radio->int_in_buffer);
 841                 video_unregister_device(radio->videodev);
 842                 kfree(radio->buffer);
 843                 mutex_unlock(&radio->lock);
 844                 kfree(radio);
 845         } else {
 846                 mutex_unlock(&radio->lock);
 847         }
 848 }
 849
 850
 851 /*
 852  * si470x_usb_driver - usb driver interface
 853  */
 854 static struct usb_driver si470x_usb_driver = {
 855         .name                   = DRIVER_NAME,
 856         .probe                  = si470x_usb_driver_probe,
 857         .disconnect             = si470x_usb_driver_disconnect,
 858         .suspend                = si470x_usb_driver_suspend,
 859         .resume                 = si470x_usb_driver_resume,
 860         .id_table               = si470x_usb_driver_id_table,
 861         .supports_autosuspend   = 1,
 862 };
 863
 864 module_usb_driver(si470x_usb_driver);
 865
 866 MODULE_LICENSE("GPL");
 867 MODULE_AUTHOR(DRIVER_AUTHOR);
 868 MODULE_DESCRIPTION(DRIVER_DESC);
 869 MODULE_VERSION(DRIVER_VERSION);