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
  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         unsigned char buf[RDS_REPORT_SIZE];
 399         int retval;
 400         unsigned char regnr;
 401         unsigned char blocknum;
 402         unsigned short bler; /* rds block errors */
 403         unsigned short rds;
 404         unsigned char tmpbuf[3];
 405
 406         if (urb->status) {
 407                 if (urb->status == -ENOENT ||
 408                                 urb->status == -ECONNRESET ||
 409                                 urb->status == -ESHUTDOWN) {
 410                         return;
 411                 } else {
 412                         dev_warn(&radio->intf->dev,
 413                          "non-zero urb status (%d)\n", urb->status);
 414                         goto resubmit; /* Maybe we can recover. */
 415                 }
 416         }
 417
 418         /* safety checks */
 419         if (radio->disconnected)
 420                 return;
 421         if ((radio->registers[SYSCONFIG1] & SYSCONFIG1_RDS) == 0)
 422                 goto resubmit;
 423
 424         if (urb->actual_length > 0) {
 425                 /* Update RDS registers with URB data */
 426                 buf[0] = RDS_REPORT;
 427                 for (regnr = 0; regnr < RDS_REGISTER_NUM; regnr++)
 428                         radio->registers[STATUSRSSI + regnr] =
 429                             get_unaligned_be16(&radio->int_in_buffer[
 430                                 regnr * RADIO_REGISTER_SIZE + 1]);
 431                 /* get rds blocks */
 432                 if ((radio->registers[STATUSRSSI] & STATUSRSSI_RDSR) == 0) {
 433                         /* No RDS group ready, better luck next time */
 434                         goto resubmit;
 435                 }
 436                 if ((radio->registers[STATUSRSSI] & STATUSRSSI_RDSS) == 0) {
 437                         /* RDS decoder not synchronized */
 438                         goto resubmit;
 439                 }
 440                 for (blocknum = 0; blocknum < 4; blocknum++) {
 441                         switch (blocknum) {
 442                         default:
 443                                 bler = (radio->registers[STATUSRSSI] &
 444                                                 STATUSRSSI_BLERA) >> 9;
 445                                 rds = radio->registers[RDSA];
 446                                 break;
 447                         case 1:
 448                                 bler = (radio->registers[READCHAN] &
 449                                                 READCHAN_BLERB) >> 14;
 450                                 rds = radio->registers[RDSB];
 451                                 break;
 452                         case 2:
 453                                 bler = (radio->registers[READCHAN] &
 454                                                 READCHAN_BLERC) >> 12;
 455                                 rds = radio->registers[RDSC];
 456                                 break;
 457                         case 3:
 458                                 bler = (radio->registers[READCHAN] &
 459                                                 READCHAN_BLERD) >> 10;
 460                                 rds = radio->registers[RDSD];
 461                                 break;
 462                         };
 463
 464                         /* Fill the V4L2 RDS buffer */
 465                         put_unaligned_le16(rds, &tmpbuf);
 466                         tmpbuf[2] = blocknum;           /* offset name */
 467                         tmpbuf[2] |= blocknum << 3;     /* received offset */
 468                         if (bler > max_rds_errors)
 469                                 tmpbuf[2] |= 0x80; /* uncorrectable errors */
 470                         else if (bler > 0)
 471                                 tmpbuf[2] |= 0x40; /* corrected error(s) */
 472
 473                         /* copy RDS block to internal buffer */
 474                         memcpy(&radio->buffer[radio->wr_index], &tmpbuf, 3);
 475                         radio->wr_index += 3;
 476
 477                         /* wrap write pointer */
 478                         if (radio->wr_index >= radio->buf_size)
 479                                 radio->wr_index = 0;
 480
 481                         /* check for overflow */
 482                         if (radio->wr_index == radio->rd_index) {
 483                                 /* increment and wrap read pointer */
 484                                 radio->rd_index += 3;
 485                                 if (radio->rd_index >= radio->buf_size)
 486                                         radio->rd_index = 0;
 487                         }
 488                 }
 489                 if (radio->wr_index != radio->rd_index)
 490                         wake_up_interruptible(&radio->read_queue);
 491         }
 492
 493 resubmit:
 494         /* Resubmit if we're still running. */
 495         if (radio->int_in_running && radio->usbdev) {
 496                 retval = usb_submit_urb(radio->int_in_urb, GFP_ATOMIC);
 497                 if (retval) {
 498                         dev_warn(&radio->intf->dev,
 499                                "resubmitting urb failed (%d)", retval);
 500                         radio->int_in_running = 0;
 501                 }
 502         }
 503 }
 504
 505
 506
 507 /**************************************************************************
 508  * File Operations Interface
 509  **************************************************************************/
 510
 511 /*
 512  * si470x_fops_open - file open
 513  */
 514 int si470x_fops_open(struct file *file)
 515 {
 516         struct si470x_device *radio = video_drvdata(file);
 517         int retval;
 518
 519         lock_kernel();
 520         radio->users++;
 521
 522         retval = usb_autopm_get_interface(radio->intf);
 523         if (retval < 0) {
 524                 radio->users--;
 525                 retval = -EIO;
 526                 goto done;
 527         }
 528
 529         if (radio->users == 1) {
 530                 /* start radio */
 531                 retval = si470x_start(radio);
 532                 if (retval < 0) {
 533                         usb_autopm_put_interface(radio->intf);
 534                         goto done;
 535                 }
 536
 537                 /* initialize interrupt urb */
 538                 usb_fill_int_urb(radio->int_in_urb, radio->usbdev,
 539                         usb_rcvintpipe(radio->usbdev,
 540                         radio->int_in_endpoint->bEndpointAddress),
 541                         radio->int_in_buffer,
 542                         le16_to_cpu(radio->int_in_endpoint->wMaxPacketSize),
 543                         si470x_int_in_callback,
 544                         radio,
 545                         radio->int_in_endpoint->bInterval);
 546
 547                 radio->int_in_running = 1;
 548                 mb();
 549
 550                 retval = usb_submit_urb(radio->int_in_urb, GFP_KERNEL);
 551                 if (retval) {
 552                         dev_info(&radio->intf->dev,
 553                                  "submitting int urb failed (%d)\n", retval);
 554                         radio->int_in_running = 0;
 555                         usb_autopm_put_interface(radio->intf);
 556                 }
 557         }
 558
 559 done:
 560         unlock_kernel();
 561         return retval;
 562 }
 563
 564
 565 /*
 566  * si470x_fops_release - file release
 567  */
 568 int si470x_fops_release(struct file *file)
 569 {
 570         struct si470x_device *radio = video_drvdata(file);
 571         int retval = 0;
 572
 573         /* safety check */
 574         if (!radio) {
 575                 retval = -ENODEV;
 576                 goto done;
 577         }
 578
 579         mutex_lock(&radio->disconnect_lock);
 580         radio->users--;
 581         if (radio->users == 0) {
 582                 /* shutdown interrupt handler */
 583                 if (radio->int_in_running) {
 584                         radio->int_in_running = 0;
 585                 if (radio->int_in_urb)
 586                         usb_kill_urb(radio->int_in_urb);
 587                 }
 588
 589                 if (radio->disconnected) {
 590                         video_unregister_device(radio->videodev);
 591                         kfree(radio->int_in_buffer);
 592                         kfree(radio->buffer);
 593                         mutex_unlock(&radio->disconnect_lock);
 594                         kfree(radio);
 595                         goto done;
 596                 }
 597
 598                 /* cancel read processes */
 599                 wake_up_interruptible(&radio->read_queue);
 600
 601                 /* stop radio */
 602                 retval = si470x_stop(radio);
 603                 usb_autopm_put_interface(radio->intf);
 604         }
 605         mutex_unlock(&radio->disconnect_lock);
 606 done:
 607         return retval;
 608 }
 609
 610
 611
 612 /**************************************************************************
 613  * Video4Linux Interface
 614  **************************************************************************/
 615
 616 /*
 617  * si470x_vidioc_querycap - query device capabilities
 618  */
 619 int si470x_vidioc_querycap(struct file *file, void *priv,
 620                 struct v4l2_capability *capability)
 621 {
 622         struct si470x_device *radio = video_drvdata(file);
 623
 624         strlcpy(capability->driver, DRIVER_NAME, sizeof(capability->driver));
 625         strlcpy(capability->card, DRIVER_CARD, sizeof(capability->card));
 626         usb_make_path(radio->usbdev, capability->bus_info,
 627                         sizeof(capability->bus_info));
 628         capability->version = DRIVER_KERNEL_VERSION;
 629         capability->capabilities = V4L2_CAP_HW_FREQ_SEEK |
 630                 V4L2_CAP_TUNER | V4L2_CAP_RADIO | V4L2_CAP_RDS_CAPTURE;
 631
 632         return 0;
 633 }
 634
 635
 636
 637 /**************************************************************************
 638  * USB Interface
 639  **************************************************************************/
 640
 641 /*
 642  * si470x_usb_driver_probe - probe for the device
 643  */
 644 static int si470x_usb_driver_probe(struct usb_interface *intf,
 645                 const struct usb_device_id *id)
 646 {
 647         struct si470x_device *radio;
 648         struct usb_host_interface *iface_desc;
 649         struct usb_endpoint_descriptor *endpoint;
 650         int i, int_end_size, retval = 0;
 651         unsigned char version_warning = 0;
 652
 653         /* private data allocation and initialization */
 654         radio = kzalloc(sizeof(struct si470x_device), GFP_KERNEL);
 655         if (!radio) {
 656                 retval = -ENOMEM;
 657                 goto err_initial;
 658         }
 659         radio->users = 0;
 660         radio->disconnected = 0;
 661         radio->usbdev = interface_to_usbdev(intf);
 662         radio->intf = intf;
 663         mutex_init(&radio->disconnect_lock);
 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->disconnect_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                 kfree(radio);
 846         }
 847         mutex_unlock(&radio->disconnect_lock);
 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
 865
 866 /**************************************************************************
 867  * Module Interface
 868  **************************************************************************/
 869
 870 /*
 871  * si470x_module_init - module init
 872  */
 873 static int __init si470x_module_init(void)
 874 {
 875         printk(KERN_INFO DRIVER_DESC ", Version " DRIVER_VERSION "\n");
 876         return usb_register(&si470x_usb_driver);
 877 }
 878
 879
 880 /*
 881  * si470x_module_exit - module exit
 882  */
 883 static void __exit si470x_module_exit(void)
 884 {
 885         usb_deregister(&si470x_usb_driver);
 886 }
 887
 888
 889 module_init(si470x_module_init);
 890 module_exit(si470x_module_exit);
 891
 892 MODULE_LICENSE("GPL");
 893 MODULE_AUTHOR(DRIVER_AUTHOR);
 894 MODULE_DESCRIPTION(DRIVER_DESC);
 895 MODULE_VERSION(DRIVER_VERSION);