drivers/media/radio/radio-si470x.c

   1 /*
   2  *  drivers/media/radio/radio-si470x.c
   3  *
   4  *  Driver for USB radios for the Silicon Labs Si470x FM Radio Receivers:
   5  *   - Silicon Labs USB FM Radio Reference Design
   6  *   - ADS/Tech FM Radio Receiver (formerly Instant FM Music) (RDX-155-EF)
   7  *   - KWorld USB FM Radio SnapMusic Mobile 700 (FM700)
   8  *   - Sanei Electric, Inc. FM USB Radio (sold as DealExtreme.com PCear)
   9  *
  10  *  Copyright (c) 2009 Tobias Lorenz <tobias.lorenz@gmx.net>
  11  *
  12  * This program is free software; you can redistribute it and/or modify
  13  * it under the terms of the GNU General Public License as published by
  14  * the Free Software Foundation; either version 2 of the License, or
  15  * (at your option) any later version.
  16  *
  17  * This program is distributed in the hope that it will be useful,
  18  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  19  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  20  * GNU General Public License for more details.
  21  *
  22  * You should have received a copy of the GNU General Public License
  23  * along with this program; if not, write to the Free Software
  24  * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
  25  */
  26
  27
  28 /*
  29  * History:
  30  * 2008-01-12   Tobias Lorenz <tobias.lorenz@gmx.net>
  31  *              Version 1.0.0
  32  *              - First working version
  33  * 2008-01-13   Tobias Lorenz <tobias.lorenz@gmx.net>
  34  *              Version 1.0.1
  35  *              - Improved error handling, every function now returns errno
  36  *              - Improved multi user access (start/mute/stop)
  37  *              - Channel doesn't get lost anymore after start/mute/stop
  38  *              - RDS support added (polling mode via interrupt EP 1)
  39  *              - marked default module parameters with *value*
  40  *              - switched from bit structs to bit masks
  41  *              - header file cleaned and integrated
  42  * 2008-01-14   Tobias Lorenz <tobias.lorenz@gmx.net>
  43  *              Version 1.0.2
  44  *              - hex values are now lower case
  45  *              - commented USB ID for ADS/Tech moved on todo list
  46  *              - blacklisted si470x in hid-quirks.c
  47  *              - rds buffer handling functions integrated into *_work, *_read
  48  *              - rds_command in si470x_poll exchanged against simple retval
  49  *              - check for firmware version 15
  50  *              - code order and prototypes still remain the same
  51  *              - spacing and bottom of band codes remain the same
  52  * 2008-01-16   Tobias Lorenz <tobias.lorenz@gmx.net>
  53  *              Version 1.0.3
  54  *              - code reordered to avoid function prototypes
  55  *              - switch/case defaults are now more user-friendly
  56  *              - unified comment style
  57  *              - applied all checkpatch.pl v1.12 suggestions
  58  *                except the warning about the too long lines with bit comments
  59  *              - renamed FMRADIO to RADIO to cut line length (checkpatch.pl)
  60  * 2008-01-22   Tobias Lorenz <tobias.lorenz@gmx.net>
  61  *              Version 1.0.4
  62  *              - avoid poss. locking when doing copy_to_user which may sleep
  63  *              - RDS is automatically activated on read now
  64  *              - code cleaned of unnecessary rds_commands
  65  *              - USB Vendor/Product ID for ADS/Tech FM Radio Receiver verified
  66  *                (thanks to Guillaume RAMOUSSE)
  67  * 2008-01-27   Tobias Lorenz <tobias.lorenz@gmx.net>
  68  *              Version 1.0.5
  69  *              - number of seek_retries changed to tune_timeout
  70  *              - fixed problem with incomplete tune operations by own buffers
  71  *              - optimization of variables and printf types
  72  *              - improved error logging
  73  * 2008-01-31   Tobias Lorenz <tobias.lorenz@gmx.net>
  74  *              Oliver Neukum <oliver@neukum.org>
  75  *              Version 1.0.6
  76  *              - fixed coverity checker warnings in *_usb_driver_disconnect
  77  *              - probe()/open() race by correct ordering in probe()
  78  *              - DMA coherency rules by separate allocation of all buffers
  79  *              - use of endianness macros
  80  *              - abuse of spinlock, replaced by mutex
  81  *              - racy handling of timer in disconnect,
  82  *                replaced by delayed_work
  83  *              - racy interruptible_sleep_on(),
  84  *                replaced with wait_event_interruptible()
  85  *              - handle signals in read()
  86  * 2008-02-08   Tobias Lorenz <tobias.lorenz@gmx.net>
  87  *              Oliver Neukum <oliver@neukum.org>
  88  *              Version 1.0.7
  89  *              - usb autosuspend support
  90  *              - unplugging fixed
  91  * 2008-05-07   Tobias Lorenz <tobias.lorenz@gmx.net>
  92  *              Version 1.0.8
  93  *              - hardware frequency seek support
  94  *              - afc indication
  95  *              - more safety checks, let si470x_get_freq return errno
  96  *              - vidioc behavior corrected according to v4l2 spec
  97  * 2008-10-20   Alexey Klimov <klimov.linux@gmail.com>
  98  *              - add support for KWorld USB FM Radio FM700
  99  *              - blacklisted KWorld radio in hid-core.c and hid-ids.h
 100  * 2008-12-03   Mark Lord <mlord@pobox.com>
 101  *              - add support for DealExtreme USB Radio
 102  * 2009-01-31   Bob Ross <pigiron@gmx.com>
 103  *              - correction of stereo detection/setting
 104  *              - correction of signal strength indicator scaling
 105  * 2009-01-31   Rick Bronson <rick@efn.org>
 106  *              Tobias Lorenz <tobias.lorenz@gmx.net>
 107  *              - add LED status output
 108  *              - get HW/SW version from scratchpad
 109  * 2009-06-16   Edouard Lafargue <edouard@lafargue.name>
 110  *              Version 1.0.10
 111  *              - add support for interrupt mode for RDS endpoint,
 112  *                instead of polling.
 113  *                Improves RDS reception significantly
 114  *
 115  * ToDo:
 116  * - add firmware download/update support
 117  */
 118
 119
 120 /* driver definitions */
 121 #define DRIVER_AUTHOR "Tobias Lorenz <tobias.lorenz@gmx.net>"
 122 #define DRIVER_NAME "radio-si470x"
 123 #define DRIVER_KERNEL_VERSION KERNEL_VERSION(1, 0, 10)
 124 #define DRIVER_CARD "Silicon Labs Si470x FM Radio Receiver"
 125 #define DRIVER_DESC "USB radio driver for Si470x FM Radio Receivers"
 126 #define DRIVER_VERSION "1.0.10"
 127
 128
 129 /* kernel includes */
 130 #include <linux/kernel.h>
 131 #include <linux/module.h>
 132 #include <linux/init.h>
 133 #include <linux/slab.h>
 134 #include <linux/smp_lock.h>
 135 #include <linux/input.h>
 136 #include <linux/usb.h>
 137 #include <linux/hid.h>
 138 #include <linux/version.h>
 139 #include <linux/videodev2.h>
 140 #include <linux/mutex.h>
 141 #include <media/v4l2-common.h>
 142 #include <media/v4l2-ioctl.h>
 143 #include <media/rds.h>
 144 #include <asm/unaligned.h>
 145
 146
 147 /* USB Device ID List */
 148 static struct usb_device_id si470x_usb_driver_id_table[] = {
 149         /* Silicon Labs USB FM Radio Reference Design */
 150         { USB_DEVICE_AND_INTERFACE_INFO(0x10c4, 0x818a, USB_CLASS_HID, 0, 0) },
 151         /* ADS/Tech FM Radio Receiver (formerly Instant FM Music) */
 152         { USB_DEVICE_AND_INTERFACE_INFO(0x06e1, 0xa155, USB_CLASS_HID, 0, 0) },
 153         /* KWorld USB FM Radio SnapMusic Mobile 700 (FM700) */
 154         { USB_DEVICE_AND_INTERFACE_INFO(0x1b80, 0xd700, USB_CLASS_HID, 0, 0) },
 155         /* Sanei Electric, Inc. FM USB Radio (sold as DealExtreme.com PCear) */
 156         { USB_DEVICE_AND_INTERFACE_INFO(0x10c5, 0x819a, USB_CLASS_HID, 0, 0) },
 157         /* Terminating entry */
 158         { }
 159 };
 160 MODULE_DEVICE_TABLE(usb, si470x_usb_driver_id_table);
 161
 162
 163
 164 /**************************************************************************
 165  * Module Parameters
 166  **************************************************************************/
 167
 168 /* Radio Nr */
 169 static int radio_nr = -1;
 170 module_param(radio_nr, int, 0444);
 171 MODULE_PARM_DESC(radio_nr, "Radio Nr");
 172
 173 /* Spacing (kHz) */
 174 /* 0: 200 kHz (USA, Australia) */
 175 /* 1: 100 kHz (Europe, Japan) */
 176 /* 2:  50 kHz */
 177 static unsigned short space = 2;
 178 module_param(space, ushort, 0444);
 179 MODULE_PARM_DESC(space, "Spacing: 0=200kHz 1=100kHz *2=50kHz*");
 180
 181 /* Bottom of Band (MHz) */
 182 /* 0: 87.5 - 108 MHz (USA, Europe)*/
 183 /* 1: 76   - 108 MHz (Japan wide band) */
 184 /* 2: 76   -  90 MHz (Japan) */
 185 static unsigned short band = 1;
 186 module_param(band, ushort, 0444);
 187 MODULE_PARM_DESC(band, "Band: 0=87.5..108MHz *1=76..108MHz* 2=76..90MHz");
 188
 189 /* De-emphasis */
 190 /* 0: 75 us (USA) */
 191 /* 1: 50 us (Europe, Australia, Japan) */
 192 static unsigned short de = 1;
 193 module_param(de, ushort, 0444);
 194 MODULE_PARM_DESC(de, "De-emphasis: 0=75us *1=50us*");
 195
 196 /* USB timeout */
 197 static unsigned int usb_timeout = 500;
 198 module_param(usb_timeout, uint, 0644);
 199 MODULE_PARM_DESC(usb_timeout, "USB timeout (ms): *500*");
 200
 201 /* Tune timeout */
 202 static unsigned int tune_timeout = 3000;
 203 module_param(tune_timeout, uint, 0644);
 204 MODULE_PARM_DESC(tune_timeout, "Tune timeout: *3000*");
 205
 206 /* Seek timeout */
 207 static unsigned int seek_timeout = 5000;
 208 module_param(seek_timeout, uint, 0644);
 209 MODULE_PARM_DESC(seek_timeout, "Seek timeout: *5000*");
 210
 211 /* RDS buffer blocks */
 212 static unsigned int rds_buf = 100;
 213 module_param(rds_buf, uint, 0444);
 214 MODULE_PARM_DESC(rds_buf, "RDS buffer entries: *100*");
 215
 216 /* RDS maximum block errors */
 217 static unsigned short max_rds_errors = 1;
 218 /* 0 means   0  errors requiring correction */
 219 /* 1 means 1-2  errors requiring correction (used by original USBRadio.exe) */
 220 /* 2 means 3-5  errors requiring correction */
 221 /* 3 means   6+ errors or errors in checkword, correction not possible */
 222 module_param(max_rds_errors, ushort, 0644);
 223 MODULE_PARM_DESC(max_rds_errors, "RDS maximum block errors: *1*");
 224
 225
 226 /**************************************************************************
 227  * Register Definitions
 228  **************************************************************************/
 229 #define RADIO_REGISTER_SIZE     2       /* 16 register bit width */
 230 #define RADIO_REGISTER_NUM      16      /* DEVICEID   ... RDSD */
 231 #define RDS_REGISTER_NUM        6       /* STATUSRSSI ... RDSD */
 232
 233 #define DEVICEID                0       /* Device ID */
 234 #define DEVICEID_PN             0xf000  /* bits 15..12: Part Number */
 235 #define DEVICEID_MFGID          0x0fff  /* bits 11..00: Manufacturer ID */
 236
 237 #define CHIPID                  1       /* Chip ID */
 238 #define CHIPID_REV              0xfc00  /* bits 15..10: Chip Version */
 239 #define CHIPID_DEV              0x0200  /* bits 09..09: Device */
 240 #define CHIPID_FIRMWARE         0x01ff  /* bits 08..00: Firmware Version */
 241
 242 #define POWERCFG                2       /* Power Configuration */
 243 #define POWERCFG_DSMUTE         0x8000  /* bits 15..15: Softmute Disable */
 244 #define POWERCFG_DMUTE          0x4000  /* bits 14..14: Mute Disable */
 245 #define POWERCFG_MONO           0x2000  /* bits 13..13: Mono Select */
 246 #define POWERCFG_RDSM           0x0800  /* bits 11..11: RDS Mode (Si4701 only) */
 247 #define POWERCFG_SKMODE         0x0400  /* bits 10..10: Seek Mode */
 248 #define POWERCFG_SEEKUP         0x0200  /* bits 09..09: Seek Direction */
 249 #define POWERCFG_SEEK           0x0100  /* bits 08..08: Seek */
 250 #define POWERCFG_DISABLE        0x0040  /* bits 06..06: Powerup Disable */
 251 #define POWERCFG_ENABLE         0x0001  /* bits 00..00: Powerup Enable */
 252
 253 #define CHANNEL                 3       /* Channel */
 254 #define CHANNEL_TUNE            0x8000  /* bits 15..15: Tune */
 255 #define CHANNEL_CHAN            0x03ff  /* bits 09..00: Channel Select */
 256
 257 #define SYSCONFIG1              4       /* System Configuration 1 */
 258 #define SYSCONFIG1_RDSIEN       0x8000  /* bits 15..15: RDS Interrupt Enable (Si4701 only) */
 259 #define SYSCONFIG1_STCIEN       0x4000  /* bits 14..14: Seek/Tune Complete Interrupt Enable */
 260 #define SYSCONFIG1_RDS          0x1000  /* bits 12..12: RDS Enable (Si4701 only) */
 261 #define SYSCONFIG1_DE           0x0800  /* bits 11..11: De-emphasis (0=75us 1=50us) */
 262 #define SYSCONFIG1_AGCD         0x0400  /* bits 10..10: AGC Disable */
 263 #define SYSCONFIG1_BLNDADJ      0x00c0  /* bits 07..06: Stereo/Mono Blend Level Adjustment */
 264 #define SYSCONFIG1_GPIO3        0x0030  /* bits 05..04: General Purpose I/O 3 */
 265 #define SYSCONFIG1_GPIO2        0x000c  /* bits 03..02: General Purpose I/O 2 */
 266 #define SYSCONFIG1_GPIO1        0x0003  /* bits 01..00: General Purpose I/O 1 */
 267
 268 #define SYSCONFIG2              5       /* System Configuration 2 */
 269 #define SYSCONFIG2_SEEKTH       0xff00  /* bits 15..08: RSSI Seek Threshold */
 270 #define SYSCONFIG2_BAND         0x0080  /* bits 07..06: Band Select */
 271 #define SYSCONFIG2_SPACE        0x0030  /* bits 05..04: Channel Spacing */
 272 #define SYSCONFIG2_VOLUME       0x000f  /* bits 03..00: Volume */
 273
 274 #define SYSCONFIG3              6       /* System Configuration 3 */
 275 #define SYSCONFIG3_SMUTER       0xc000  /* bits 15..14: Softmute Attack/Recover Rate */
 276 #define SYSCONFIG3_SMUTEA       0x3000  /* bits 13..12: Softmute Attenuation */
 277 #define SYSCONFIG3_SKSNR        0x00f0  /* bits 07..04: Seek SNR Threshold */
 278 #define SYSCONFIG3_SKCNT        0x000f  /* bits 03..00: Seek FM Impulse Detection Threshold */
 279
 280 #define TEST1                   7       /* Test 1 */
 281 #define TEST1_AHIZEN            0x4000  /* bits 14..14: Audio High-Z Enable */
 282
 283 #define TEST2                   8       /* Test 2 */
 284 /* TEST2 only contains reserved bits */
 285
 286 #define BOOTCONFIG              9       /* Boot Configuration */
 287 /* BOOTCONFIG only contains reserved bits */
 288
 289 #define STATUSRSSI              10      /* Status RSSI */
 290 #define STATUSRSSI_RDSR         0x8000  /* bits 15..15: RDS Ready (Si4701 only) */
 291 #define STATUSRSSI_STC          0x4000  /* bits 14..14: Seek/Tune Complete */
 292 #define STATUSRSSI_SF           0x2000  /* bits 13..13: Seek Fail/Band Limit */
 293 #define STATUSRSSI_AFCRL        0x1000  /* bits 12..12: AFC Rail */
 294 #define STATUSRSSI_RDSS         0x0800  /* bits 11..11: RDS Synchronized (Si4701 only) */
 295 #define STATUSRSSI_BLERA        0x0600  /* bits 10..09: RDS Block A Errors (Si4701 only) */
 296 #define STATUSRSSI_ST           0x0100  /* bits 08..08: Stereo Indicator */
 297 #define STATUSRSSI_RSSI         0x00ff  /* bits 07..00: RSSI (Received Signal Strength Indicator) */
 298
 299 #define READCHAN                11      /* Read Channel */
 300 #define READCHAN_BLERB          0xc000  /* bits 15..14: RDS Block D Errors (Si4701 only) */
 301 #define READCHAN_BLERC          0x3000  /* bits 13..12: RDS Block C Errors (Si4701 only) */
 302 #define READCHAN_BLERD          0x0c00  /* bits 11..10: RDS Block B Errors (Si4701 only) */
 303 #define READCHAN_READCHAN       0x03ff  /* bits 09..00: Read Channel */
 304
 305 #define RDSA                    12      /* RDSA */
 306 #define RDSA_RDSA               0xffff  /* bits 15..00: RDS Block A Data (Si4701 only) */
 307
 308 #define RDSB                    13      /* RDSB */
 309 #define RDSB_RDSB               0xffff  /* bits 15..00: RDS Block B Data (Si4701 only) */
 310
 311 #define RDSC                    14      /* RDSC */
 312 #define RDSC_RDSC               0xffff  /* bits 15..00: RDS Block C Data (Si4701 only) */
 313
 314 #define RDSD                    15      /* RDSD */
 315 #define RDSD_RDSD               0xffff  /* bits 15..00: RDS Block D Data (Si4701 only) */
 316
 317
 318
 319 /**************************************************************************
 320  * USB HID Reports
 321  **************************************************************************/
 322
 323 /* Reports 1-16 give direct read/write access to the 16 Si470x registers */
 324 /* with the (REPORT_ID - 1) corresponding to the register address across USB */
 325 /* endpoint 0 using GET_REPORT and SET_REPORT */
 326 #define REGISTER_REPORT_SIZE    (RADIO_REGISTER_SIZE + 1)
 327 #define REGISTER_REPORT(reg)    ((reg) + 1)
 328
 329 /* Report 17 gives direct read/write access to the entire Si470x register */
 330 /* map across endpoint 0 using GET_REPORT and SET_REPORT */
 331 #define ENTIRE_REPORT_SIZE      (RADIO_REGISTER_NUM * RADIO_REGISTER_SIZE + 1)
 332 #define ENTIRE_REPORT           17
 333
 334 /* Report 18 is used to send the lowest 6 Si470x registers up the HID */
 335 /* interrupt endpoint 1 to Windows every 20 milliseconds for status */
 336 #define RDS_REPORT_SIZE         (RDS_REGISTER_NUM * RADIO_REGISTER_SIZE + 1)
 337 #define RDS_REPORT              18
 338
 339 /* Report 19: LED state */
 340 #define LED_REPORT_SIZE         3
 341 #define LED_REPORT              19
 342
 343 /* Report 19: stream */
 344 #define STREAM_REPORT_SIZE      3
 345 #define STREAM_REPORT           19
 346
 347 /* Report 20: scratch */
 348 #define SCRATCH_PAGE_SIZE       63
 349 #define SCRATCH_REPORT_SIZE     (SCRATCH_PAGE_SIZE + 1)
 350 #define SCRATCH_REPORT          20
 351
 352 /* Reports 19-22: flash upgrade of the C8051F321 */
 353 #define WRITE_REPORT_SIZE       4
 354 #define WRITE_REPORT            19
 355 #define FLASH_REPORT_SIZE       64
 356 #define FLASH_REPORT            20
 357 #define CRC_REPORT_SIZE         3
 358 #define CRC_REPORT              21
 359 #define RESPONSE_REPORT_SIZE    2
 360 #define RESPONSE_REPORT         22
 361
 362 /* Report 23: currently unused, but can accept 60 byte reports on the HID */
 363 /* interrupt out endpoint 2 every 1 millisecond */
 364 #define UNUSED_REPORT           23
 365
 366
 367
 368 /**************************************************************************
 369  * Software/Hardware Versions
 370  **************************************************************************/
 371 #define RADIO_SW_VERSION_NOT_BOOTLOADABLE       6
 372 #define RADIO_SW_VERSION                        7
 373 #define RADIO_SW_VERSION_CURRENT                15
 374 #define RADIO_HW_VERSION                        1
 375
 376 #define SCRATCH_PAGE_SW_VERSION 1
 377 #define SCRATCH_PAGE_HW_VERSION 2
 378
 379
 380
 381 /**************************************************************************
 382  * LED State Definitions
 383  **************************************************************************/
 384 #define LED_COMMAND             0x35
 385
 386 #define NO_CHANGE_LED           0x00
 387 #define ALL_COLOR_LED           0x01    /* streaming state */
 388 #define BLINK_GREEN_LED         0x02    /* connect state */
 389 #define BLINK_RED_LED           0x04
 390 #define BLINK_ORANGE_LED        0x10    /* disconnect state */
 391 #define SOLID_GREEN_LED         0x20    /* tuning/seeking state */
 392 #define SOLID_RED_LED           0x40    /* bootload state */
 393 #define SOLID_ORANGE_LED        0x80
 394
 395
 396
 397 /**************************************************************************
 398  * Stream State Definitions
 399  **************************************************************************/
 400 #define STREAM_COMMAND  0x36
 401 #define STREAM_VIDPID   0x00
 402 #define STREAM_AUDIO    0xff
 403
 404
 405
 406 /**************************************************************************
 407  * Bootloader / Flash Commands
 408  **************************************************************************/
 409
 410 /* unique id sent to bootloader and required to put into a bootload state */
 411 #define UNIQUE_BL_ID            0x34
 412
 413 /* mask for the flash data */
 414 #define FLASH_DATA_MASK         0x55
 415
 416 /* bootloader commands */
 417 #define GET_SW_VERSION_COMMAND  0x00
 418 #define SET_PAGE_COMMAND        0x01
 419 #define ERASE_PAGE_COMMAND      0x02
 420 #define WRITE_PAGE_COMMAND      0x03
 421 #define CRC_ON_PAGE_COMMAND     0x04
 422 #define READ_FLASH_BYTE_COMMAND 0x05
 423 #define RESET_DEVICE_COMMAND    0x06
 424 #define GET_HW_VERSION_COMMAND  0x07
 425 #define BLANK                   0xff
 426
 427 /* bootloader command responses */
 428 #define COMMAND_OK              0x01
 429 #define COMMAND_FAILED          0x02
 430 #define COMMAND_PENDING         0x03
 431
 432
 433
 434 /**************************************************************************
 435  * General Driver Definitions
 436  **************************************************************************/
 437
 438 /*
 439  * si470x_device - private data
 440  */
 441 struct si470x_device {
 442         /* reference to USB and video device */
 443         struct usb_device *usbdev;
 444         struct usb_interface *intf;
 445         struct video_device *videodev;
 446
 447         /* Interrupt endpoint handling */
 448         char *int_in_buffer;
 449         struct usb_endpoint_descriptor *int_in_endpoint;
 450         struct urb *int_in_urb;
 451         int int_in_running;
 452
 453         /* driver management */
 454         unsigned int users;
 455         unsigned char disconnected;
 456         struct mutex disconnect_lock;
 457
 458         /* Silabs internal registers (0..15) */
 459         unsigned short registers[RADIO_REGISTER_NUM];
 460
 461         /* RDS receive buffer */
 462         wait_queue_head_t read_queue;
 463         struct mutex lock;              /* buffer locking */
 464         unsigned char *buffer;          /* size is always multiple of three */
 465         unsigned int buf_size;
 466         unsigned int rd_index;
 467         unsigned int wr_index;
 468
 469         /* scratch page */
 470         unsigned char software_version;
 471         unsigned char hardware_version;
 472 };
 473
 474
 475 /*
 476  * The frequency is set in units of 62.5 Hz when using V4L2_TUNER_CAP_LOW,
 477  * 62.5 kHz otherwise.
 478  * The tuner is able to have a channel spacing of 50, 100 or 200 kHz.
 479  * tuner->capability is therefore set to V4L2_TUNER_CAP_LOW
 480  * The FREQ_MUL is then: 1 MHz / 62.5 Hz = 16000
 481  */
 482 #define FREQ_MUL (1000000 / 62.5)
 483
 484
 485
 486 /**************************************************************************
 487  * General Driver Functions - REGISTER_REPORTs
 488  **************************************************************************/
 489
 490 /*
 491  * si470x_get_report - receive a HID report
 492  */
 493 static int si470x_get_report(struct si470x_device *radio, void *buf, int size)
 494 {
 495         unsigned char *report = (unsigned char *) buf;
 496         int retval;
 497
 498         retval = usb_control_msg(radio->usbdev,
 499                 usb_rcvctrlpipe(radio->usbdev, 0),
 500                 HID_REQ_GET_REPORT,
 501                 USB_TYPE_CLASS | USB_RECIP_INTERFACE | USB_DIR_IN,
 502                 report[0], 2,
 503                 buf, size, usb_timeout);
 504
 505         if (retval < 0)
 506                 printk(KERN_WARNING DRIVER_NAME
 507                         ": si470x_get_report: usb_control_msg returned %d\n",
 508                         retval);
 509         return retval;
 510 }
 511
 512
 513 /*
 514  * si470x_set_report - send a HID report
 515  */
 516 static int si470x_set_report(struct si470x_device *radio, void *buf, int size)
 517 {
 518         unsigned char *report = (unsigned char *) buf;
 519         int retval;
 520
 521         retval = usb_control_msg(radio->usbdev,
 522                 usb_sndctrlpipe(radio->usbdev, 0),
 523                 HID_REQ_SET_REPORT,
 524                 USB_TYPE_CLASS | USB_RECIP_INTERFACE | USB_DIR_OUT,
 525                 report[0], 2,
 526                 buf, size, usb_timeout);
 527
 528         if (retval < 0)
 529                 printk(KERN_WARNING DRIVER_NAME
 530                         ": si470x_set_report: usb_control_msg returned %d\n",
 531                         retval);
 532         return retval;
 533 }
 534
 535
 536 /*
 537  * si470x_get_register - read register
 538  */
 539 static int si470x_get_register(struct si470x_device *radio, int regnr)
 540 {
 541         unsigned char buf[REGISTER_REPORT_SIZE];
 542         int retval;
 543
 544         buf[0] = REGISTER_REPORT(regnr);
 545
 546         retval = si470x_get_report(radio, (void *) &buf, sizeof(buf));
 547
 548         if (retval >= 0)
 549                 radio->registers[regnr] = get_unaligned_be16(&buf[1]);
 550
 551         return (retval < 0) ? -EINVAL : 0;
 552 }
 553
 554
 555 /*
 556  * si470x_set_register - write register
 557  */
 558 static int si470x_set_register(struct si470x_device *radio, int regnr)
 559 {
 560         unsigned char buf[REGISTER_REPORT_SIZE];
 561         int retval;
 562
 563         buf[0] = REGISTER_REPORT(regnr);
 564         put_unaligned_be16(radio->registers[regnr], &buf[1]);
 565
 566         retval = si470x_set_report(radio, (void *) &buf, sizeof(buf));
 567
 568         return (retval < 0) ? -EINVAL : 0;
 569 }
 570
 571
 572 /*
 573  * si470x_set_chan - set the channel
 574  */
 575 static int si470x_set_chan(struct si470x_device *radio, unsigned short chan)
 576 {
 577         int retval;
 578         unsigned long timeout;
 579         bool timed_out = 0;
 580
 581         /* start tuning */
 582         radio->registers[CHANNEL] &= ~CHANNEL_CHAN;
 583         radio->registers[CHANNEL] |= CHANNEL_TUNE | chan;
 584         retval = si470x_set_register(radio, CHANNEL);
 585         if (retval < 0)
 586                 goto done;
 587
 588         /* wait till tune operation has completed */
 589         timeout = jiffies + msecs_to_jiffies(tune_timeout);
 590         do {
 591                 retval = si470x_get_register(radio, STATUSRSSI);
 592                 if (retval < 0)
 593                         goto stop;
 594                 timed_out = time_after(jiffies, timeout);
 595         } while (((radio->registers[STATUSRSSI] & STATUSRSSI_STC) == 0) &&
 596                 (!timed_out));
 597         if ((radio->registers[STATUSRSSI] & STATUSRSSI_STC) == 0)
 598                 printk(KERN_WARNING DRIVER_NAME ": tune does not complete\n");
 599         if (timed_out)
 600                 printk(KERN_WARNING DRIVER_NAME
 601                         ": tune timed out after %u ms\n", tune_timeout);
 602
 603 stop:
 604         /* stop tuning */
 605         radio->registers[CHANNEL] &= ~CHANNEL_TUNE;
 606         retval = si470x_set_register(radio, CHANNEL);
 607
 608 done:
 609         return retval;
 610 }
 611
 612
 613 /*
 614  * si470x_get_freq - get the frequency
 615  */
 616 static int si470x_get_freq(struct si470x_device *radio, unsigned int *freq)
 617 {
 618         unsigned int spacing, band_bottom;
 619         unsigned short chan;
 620         int retval;
 621
 622         /* Spacing (kHz) */
 623         switch ((radio->registers[SYSCONFIG2] & SYSCONFIG2_SPACE) >> 4) {
 624         /* 0: 200 kHz (USA, Australia) */
 625         case 0:
 626                 spacing = 0.200 * FREQ_MUL; break;
 627         /* 1: 100 kHz (Europe, Japan) */
 628         case 1:
 629                 spacing = 0.100 * FREQ_MUL; break;
 630         /* 2:  50 kHz */
 631         default:
 632                 spacing = 0.050 * FREQ_MUL; break;
 633         };
 634
 635         /* Bottom of Band (MHz) */
 636         switch ((radio->registers[SYSCONFIG2] & SYSCONFIG2_BAND) >> 6) {
 637         /* 0: 87.5 - 108 MHz (USA, Europe) */
 638         case 0:
 639                 band_bottom = 87.5 * FREQ_MUL; break;
 640         /* 1: 76   - 108 MHz (Japan wide band) */
 641         default:
 642                 band_bottom = 76   * FREQ_MUL; break;
 643         /* 2: 76   -  90 MHz (Japan) */
 644         case 2:
 645                 band_bottom = 76   * FREQ_MUL; break;
 646         };
 647
 648         /* read channel */
 649         retval = si470x_get_register(radio, READCHAN);
 650         chan = radio->registers[READCHAN] & READCHAN_READCHAN;
 651
 652         /* Frequency (MHz) = Spacing (kHz) x Channel + Bottom of Band (MHz) */
 653         *freq = chan * spacing + band_bottom;
 654
 655         return retval;
 656 }
 657
 658
 659 /*
 660  * si470x_set_freq - set the frequency
 661  */
 662 static int si470x_set_freq(struct si470x_device *radio, unsigned int freq)
 663 {
 664         unsigned int spacing, band_bottom;
 665         unsigned short chan;
 666
 667         /* Spacing (kHz) */
 668         switch ((radio->registers[SYSCONFIG2] & SYSCONFIG2_SPACE) >> 4) {
 669         /* 0: 200 kHz (USA, Australia) */
 670         case 0:
 671                 spacing = 0.200 * FREQ_MUL; break;
 672         /* 1: 100 kHz (Europe, Japan) */
 673         case 1:
 674                 spacing = 0.100 * FREQ_MUL; break;
 675         /* 2:  50 kHz */
 676         default:
 677                 spacing = 0.050 * FREQ_MUL; break;
 678         };
 679
 680         /* Bottom of Band (MHz) */
 681         switch ((radio->registers[SYSCONFIG2] & SYSCONFIG2_BAND) >> 6) {
 682         /* 0: 87.5 - 108 MHz (USA, Europe) */
 683         case 0:
 684                 band_bottom = 87.5 * FREQ_MUL; break;
 685         /* 1: 76   - 108 MHz (Japan wide band) */
 686         default:
 687                 band_bottom = 76   * FREQ_MUL; break;
 688         /* 2: 76   -  90 MHz (Japan) */
 689         case 2:
 690                 band_bottom = 76   * FREQ_MUL; break;
 691         };
 692
 693         /* Chan = [ Freq (Mhz) - Bottom of Band (MHz) ] / Spacing (kHz) */
 694         chan = (freq - band_bottom) / spacing;
 695
 696         return si470x_set_chan(radio, chan);
 697 }
 698
 699
 700 /*
 701  * si470x_set_seek - set seek
 702  */
 703 static int si470x_set_seek(struct si470x_device *radio,
 704                 unsigned int wrap_around, unsigned int seek_upward)
 705 {
 706         int retval = 0;
 707         unsigned long timeout;
 708         bool timed_out = 0;
 709
 710         /* start seeking */
 711         radio->registers[POWERCFG] |= POWERCFG_SEEK;
 712         if (wrap_around == 1)
 713                 radio->registers[POWERCFG] &= ~POWERCFG_SKMODE;
 714         else
 715                 radio->registers[POWERCFG] |= POWERCFG_SKMODE;
 716         if (seek_upward == 1)
 717                 radio->registers[POWERCFG] |= POWERCFG_SEEKUP;
 718         else
 719                 radio->registers[POWERCFG] &= ~POWERCFG_SEEKUP;
 720         retval = si470x_set_register(radio, POWERCFG);
 721         if (retval < 0)
 722                 goto done;
 723
 724         /* wait till seek operation has completed */
 725         timeout = jiffies + msecs_to_jiffies(seek_timeout);
 726         do {
 727                 retval = si470x_get_register(radio, STATUSRSSI);
 728                 if (retval < 0)
 729                         goto stop;
 730                 timed_out = time_after(jiffies, timeout);
 731         } while (((radio->registers[STATUSRSSI] & STATUSRSSI_STC) == 0) &&
 732                 (!timed_out));
 733         if ((radio->registers[STATUSRSSI] & STATUSRSSI_STC) == 0)
 734                 printk(KERN_WARNING DRIVER_NAME ": seek does not complete\n");
 735         if (radio->registers[STATUSRSSI] & STATUSRSSI_SF)
 736                 printk(KERN_WARNING DRIVER_NAME
 737                         ": seek failed / band limit reached\n");
 738         if (timed_out)
 739                 printk(KERN_WARNING DRIVER_NAME
 740                         ": seek timed out after %u ms\n", seek_timeout);
 741
 742 stop:
 743         /* stop seeking */
 744         radio->registers[POWERCFG] &= ~POWERCFG_SEEK;
 745         retval = si470x_set_register(radio, POWERCFG);
 746
 747 done:
 748         /* try again, if timed out */
 749         if ((retval == 0) && timed_out)
 750                 retval = -EAGAIN;
 751
 752         return retval;
 753 }
 754
 755
 756 /*
 757  * si470x_start - switch on radio
 758  */
 759 static int si470x_start(struct si470x_device *radio)
 760 {
 761         int retval;
 762
 763         /* powercfg */
 764         radio->registers[POWERCFG] =
 765                 POWERCFG_DMUTE | POWERCFG_ENABLE | POWERCFG_RDSM;
 766         retval = si470x_set_register(radio, POWERCFG);
 767         if (retval < 0)
 768                 goto done;
 769
 770         /* sysconfig 1 */
 771         radio->registers[SYSCONFIG1] = SYSCONFIG1_DE;
 772         retval = si470x_set_register(radio, SYSCONFIG1);
 773         if (retval < 0)
 774                 goto done;
 775
 776         /* sysconfig 2 */
 777         radio->registers[SYSCONFIG2] =
 778                 (0x3f  << 8) |                          /* SEEKTH */
 779                 ((band  << 6) & SYSCONFIG2_BAND)  |     /* BAND */
 780                 ((space << 4) & SYSCONFIG2_SPACE) |     /* SPACE */
 781                 15;                                     /* VOLUME (max) */
 782         retval = si470x_set_register(radio, SYSCONFIG2);
 783         if (retval < 0)
 784                 goto done;
 785
 786         /* reset last channel */
 787         retval = si470x_set_chan(radio,
 788                 radio->registers[CHANNEL] & CHANNEL_CHAN);
 789
 790 done:
 791         return retval;
 792 }
 793
 794
 795 /*
 796  * si470x_stop - switch off radio
 797  */
 798 static int si470x_stop(struct si470x_device *radio)
 799 {
 800         int retval;
 801
 802         /* sysconfig 1 */
 803         radio->registers[SYSCONFIG1] &= ~SYSCONFIG1_RDS;
 804         retval = si470x_set_register(radio, SYSCONFIG1);
 805         if (retval < 0)
 806                 goto done;
 807
 808         /* powercfg */
 809         radio->registers[POWERCFG] &= ~POWERCFG_DMUTE;
 810         /* POWERCFG_ENABLE has to automatically go low */
 811         radio->registers[POWERCFG] |= POWERCFG_ENABLE | POWERCFG_DISABLE;
 812         retval = si470x_set_register(radio, POWERCFG);
 813
 814 done:
 815         return retval;
 816 }
 817
 818
 819 /*
 820  * si470x_rds_on - switch on rds reception
 821  */
 822 static int si470x_rds_on(struct si470x_device *radio)
 823 {
 824         int retval;
 825
 826         /* sysconfig 1 */
 827         mutex_lock(&radio->lock);
 828         radio->registers[SYSCONFIG1] |= SYSCONFIG1_RDS;
 829         retval = si470x_set_register(radio, SYSCONFIG1);
 830         if (retval < 0)
 831                 radio->registers[SYSCONFIG1] &= ~SYSCONFIG1_RDS;
 832         mutex_unlock(&radio->lock);
 833
 834         return retval;
 835 }
 836
 837
 838
 839 /**************************************************************************
 840  * General Driver Functions - ENTIRE_REPORT
 841  **************************************************************************/
 842
 843 /*
 844  * si470x_get_all_registers - read entire registers
 845  */
 846 static int si470x_get_all_registers(struct si470x_device *radio)
 847 {
 848         unsigned char buf[ENTIRE_REPORT_SIZE];
 849         int retval;
 850         unsigned char regnr;
 851
 852         buf[0] = ENTIRE_REPORT;
 853
 854         retval = si470x_get_report(radio, (void *) &buf, sizeof(buf));
 855
 856         if (retval >= 0)
 857                 for (regnr = 0; regnr < RADIO_REGISTER_NUM; regnr++)
 858                         radio->registers[regnr] = get_unaligned_be16(
 859                                 &buf[regnr * RADIO_REGISTER_SIZE + 1]);
 860
 861         return (retval < 0) ? -EINVAL : 0;
 862 }
 863
 864
 865
 866 /**************************************************************************
 867  * General Driver Functions - LED_REPORT
 868  **************************************************************************/
 869
 870 /*
 871  * si470x_set_led_state - sets the led state
 872  */
 873 static int si470x_set_led_state(struct si470x_device *radio,
 874                 unsigned char led_state)
 875 {
 876         unsigned char buf[LED_REPORT_SIZE];
 877         int retval;
 878
 879         buf[0] = LED_REPORT;
 880         buf[1] = LED_COMMAND;
 881         buf[2] = led_state;
 882
 883         retval = si470x_set_report(radio, (void *) &buf, sizeof(buf));
 884
 885         return (retval < 0) ? -EINVAL : 0;
 886 }
 887
 888
 889
 890 /**************************************************************************
 891  * General Driver Functions - SCRATCH_REPORT
 892  **************************************************************************/
 893
 894 /*
 895  * si470x_get_scratch_versions - gets the scratch page and version infos
 896  */
 897 static int si470x_get_scratch_page_versions(struct si470x_device *radio)
 898 {
 899         unsigned char buf[SCRATCH_REPORT_SIZE];
 900         int retval;
 901
 902         buf[0] = SCRATCH_REPORT;
 903
 904         retval = si470x_get_report(radio, (void *) &buf, sizeof(buf));
 905
 906         if (retval < 0)
 907                 printk(KERN_WARNING DRIVER_NAME ": si470x_get_scratch: "
 908                         "si470x_get_report returned %d\n", retval);
 909         else {
 910                 radio->software_version = buf[1];
 911                 radio->hardware_version = buf[2];
 912         }
 913
 914         return (retval < 0) ? -EINVAL : 0;
 915 }
 916
 917
 918
 919 /**************************************************************************
 920  * RDS Driver Functions
 921  **************************************************************************/
 922
 923 /*
 924  * si470x_int_in_callback - rds callback and processing function
 925  *
 926  * TODO: do we need to use mutex locks in some sections?
 927  */
 928 static void si470x_int_in_callback(struct urb *urb)
 929 {
 930         struct si470x_device *radio = urb->context;
 931         unsigned char buf[RDS_REPORT_SIZE];
 932         int retval;
 933         unsigned char regnr;
 934         unsigned char blocknum;
 935         unsigned short bler; /* rds block errors */
 936         unsigned short rds;
 937         unsigned char tmpbuf[3];
 938
 939         if (urb->status) {
 940                 if (urb->status == -ENOENT ||
 941                                 urb->status == -ECONNRESET ||
 942                                 urb->status == -ESHUTDOWN) {
 943                         return;
 944                 } else {
 945                         printk(KERN_WARNING DRIVER_NAME
 946                          ": non-zero urb status (%d)\n", urb->status);
 947                         goto resubmit; /* Maybe we can recover. */
 948                 }
 949         }
 950
 951         /* safety checks */
 952         if (radio->disconnected)
 953                 return;
 954         if ((radio->registers[SYSCONFIG1] & SYSCONFIG1_RDS) == 0)
 955                 goto resubmit;
 956
 957         if (urb->actual_length > 0) {
 958                 /* Update RDS registers with URB data */
 959                 buf[0] = RDS_REPORT;
 960                 for (regnr = 0; regnr < RDS_REGISTER_NUM; regnr++)
 961                         radio->registers[STATUSRSSI + regnr] =
 962                             get_unaligned_be16(&radio->int_in_buffer[
 963                                 regnr * RADIO_REGISTER_SIZE + 1]);
 964                 /* get rds blocks */
 965                 if ((radio->registers[STATUSRSSI] & STATUSRSSI_RDSR) == 0) {
 966                         /* No RDS group ready, better luck next time */
 967                         goto resubmit;
 968                 }
 969                 if ((radio->registers[STATUSRSSI] & STATUSRSSI_RDSS) == 0) {
 970                         /* RDS decoder not synchronized */
 971                         goto resubmit;
 972                 }
 973                 for (blocknum = 0; blocknum < 4; blocknum++) {
 974                         switch (blocknum) {
 975                         default:
 976                                 bler = (radio->registers[STATUSRSSI] &
 977                                                 STATUSRSSI_BLERA) >> 9;
 978                                 rds = radio->registers[RDSA];
 979                                 break;
 980                         case 1:
 981                                 bler = (radio->registers[READCHAN] &
 982                                                 READCHAN_BLERB) >> 14;
 983                                 rds = radio->registers[RDSB];
 984                                 break;
 985                         case 2:
 986                                 bler = (radio->registers[READCHAN] &
 987                                                 READCHAN_BLERC) >> 12;
 988                                 rds = radio->registers[RDSC];
 989                                 break;
 990                         case 3:
 991                                 bler = (radio->registers[READCHAN] &
 992                                                 READCHAN_BLERD) >> 10;
 993                                 rds = radio->registers[RDSD];
 994                                 break;
 995                         };
 996
 997                         /* Fill the V4L2 RDS buffer */
 998                         put_unaligned_le16(rds, &tmpbuf);
 999                         tmpbuf[2] = blocknum;           /* offset name */
1000                         tmpbuf[2] |= blocknum << 3;     /* received offset */
1001                         if (bler > max_rds_errors)
1002                                 tmpbuf[2] |= 0x80; /* uncorrectable errors */
1003                         else if (bler > 0)
1004                                 tmpbuf[2] |= 0x40; /* corrected error(s) */
1005
1006                         /* copy RDS block to internal buffer */
1007                         memcpy(&radio->buffer[radio->wr_index], &tmpbuf, 3);
1008                         radio->wr_index += 3;
1009
1010                         /* wrap write pointer */
1011                         if (radio->wr_index >= radio->buf_size)
1012                                 radio->wr_index = 0;
1013
1014                         /* check for overflow */
1015                         if (radio->wr_index == radio->rd_index) {
1016                                 /* increment and wrap read pointer */
1017                                 radio->rd_index += 3;
1018                                 if (radio->rd_index >= radio->buf_size)
1019                                         radio->rd_index = 0;
1020                         }
1021                 }
1022                 if (radio->wr_index != radio->rd_index)
1023                         wake_up_interruptible(&radio->read_queue);
1024         }
1025
1026 resubmit:
1027         /* Resubmit if we're still running. */
1028         if (radio->int_in_running && radio->usbdev) {
1029                 retval = usb_submit_urb(radio->int_in_urb, GFP_ATOMIC);
1030                 if (retval) {
1031                         printk(KERN_WARNING DRIVER_NAME
1032                                ": resubmitting urb failed (%d)", retval);
1033                         radio->int_in_running = 0;
1034                 }
1035         }
1036 }
1037
1038
1039
1040 /**************************************************************************
1041  * File Operations Interface
1042  **************************************************************************/
1043
1044 /*
1045  * si470x_fops_read - read RDS data
1046  */
1047 static ssize_t si470x_fops_read(struct file *file, char __user *buf,
1048                 size_t count, loff_t *ppos)
1049 {
1050         struct si470x_device *radio = video_drvdata(file);
1051         int retval = 0;
1052         unsigned int block_count = 0;
1053
1054         /* switch on rds reception */
1055         if ((radio->registers[SYSCONFIG1] & SYSCONFIG1_RDS) == 0) {
1056                 si470x_rds_on(radio);
1057         }
1058
1059         /* block if no new data available */
1060         while (radio->wr_index == radio->rd_index) {
1061                 if (file->f_flags & O_NONBLOCK) {
1062                         retval = -EWOULDBLOCK;
1063                         goto done;
1064                 }
1065                 if (wait_event_interruptible(radio->read_queue,
1066                         radio->wr_index != radio->rd_index) < 0) {
1067                         retval = -EINTR;
1068                         goto done;
1069                 }
1070         }
1071
1072         /* calculate block count from byte count */
1073         count /= 3;
1074
1075         /* copy RDS block out of internal buffer and to user buffer */
1076         mutex_lock(&radio->lock);
1077         while (block_count < count) {
1078                 if (radio->rd_index == radio->wr_index)
1079                         break;
1080
1081                 /* always transfer rds complete blocks */
1082                 if (copy_to_user(buf, &radio->buffer[radio->rd_index], 3))
1083                         /* retval = -EFAULT; */
1084                         break;
1085
1086                 /* increment and wrap read pointer */
1087                 radio->rd_index += 3;
1088                 if (radio->rd_index >= radio->buf_size)
1089                         radio->rd_index = 0;
1090
1091                 /* increment counters */
1092                 block_count++;
1093                 buf += 3;
1094                 retval += 3;
1095         }
1096         mutex_unlock(&radio->lock);
1097
1098 done:
1099         return retval;
1100 }
1101
1102
1103 /*
1104  * si470x_fops_poll - poll RDS data
1105  */
1106 static unsigned int si470x_fops_poll(struct file *file,
1107                 struct poll_table_struct *pts)
1108 {
1109         struct si470x_device *radio = video_drvdata(file);
1110         int retval = 0;
1111
1112         /* switch on rds reception */
1113         if ((radio->registers[SYSCONFIG1] & SYSCONFIG1_RDS) == 0) {
1114                 si470x_rds_on(radio);
1115         }
1116
1117         poll_wait(file, &radio->read_queue, pts);
1118
1119         if (radio->rd_index != radio->wr_index)
1120                 retval = POLLIN | POLLRDNORM;
1121
1122         return retval;
1123 }
1124
1125
1126 /*
1127  * si470x_fops_open - file open
1128  */
1129 static int si470x_fops_open(struct file *file)
1130 {
1131         struct si470x_device *radio = video_drvdata(file);
1132         int retval;
1133
1134         lock_kernel();
1135         radio->users++;
1136
1137         retval = usb_autopm_get_interface(radio->intf);
1138         if (retval < 0) {
1139                 radio->users--;
1140                 retval = -EIO;
1141                 goto done;
1142         }
1143
1144         if (radio->users == 1) {
1145                 /* start radio */
1146                 retval = si470x_start(radio);
1147                 if (retval < 0) {
1148                         usb_autopm_put_interface(radio->intf);
1149                         goto done;
1150                 }
1151
1152                 /* initialize interrupt urb */
1153                 usb_fill_int_urb(radio->int_in_urb, radio->usbdev,
1154                         usb_rcvintpipe(radio->usbdev,
1155                         radio->int_in_endpoint->bEndpointAddress),
1156                         radio->int_in_buffer,
1157                         le16_to_cpu(radio->int_in_endpoint->wMaxPacketSize),
1158                         si470x_int_in_callback,
1159                         radio,
1160                         radio->int_in_endpoint->bInterval);
1161
1162                 radio->int_in_running = 1;
1163                 mb();
1164
1165                 retval = usb_submit_urb(radio->int_in_urb, GFP_KERNEL);
1166                 if (retval) {
1167                         printk(KERN_INFO DRIVER_NAME
1168                                  ": submitting int urb failed (%d)\n", retval);
1169                         radio->int_in_running = 0;
1170                         usb_autopm_put_interface(radio->intf);
1171                 }
1172         }
1173
1174 done:
1175         unlock_kernel();
1176         return retval;
1177 }
1178
1179
1180 /*
1181  * si470x_fops_release - file release
1182  */
1183 static int si470x_fops_release(struct file *file)
1184 {
1185         struct si470x_device *radio = video_drvdata(file);
1186         int retval = 0;
1187
1188         /* safety check */
1189         if (!radio) {
1190                 retval = -ENODEV;
1191                 goto done;
1192         }
1193
1194         mutex_lock(&radio->disconnect_lock);
1195         radio->users--;
1196         if (radio->users == 0) {
1197                 /* shutdown interrupt handler */
1198                 if (radio->int_in_running) {
1199                         radio->int_in_running = 0;
1200                 if (radio->int_in_urb)
1201                         usb_kill_urb(radio->int_in_urb);
1202                 }
1203
1204                 if (radio->disconnected) {
1205                         video_unregister_device(radio->videodev);
1206                         kfree(radio->int_in_buffer);
1207                         kfree(radio->buffer);
1208                         kfree(radio);
1209                         goto unlock;
1210                 }
1211
1212                 /* cancel read processes */
1213                 wake_up_interruptible(&radio->read_queue);
1214
1215                 /* stop radio */
1216                 retval = si470x_stop(radio);
1217                 usb_autopm_put_interface(radio->intf);
1218         }
1219 unlock:
1220         mutex_unlock(&radio->disconnect_lock);
1221 done:
1222         return retval;
1223 }
1224
1225
1226 /*
1227  * si470x_fops - file operations interface
1228  */
1229 static const struct v4l2_file_operations si470x_fops = {
1230         .owner          = THIS_MODULE,
1231         .read           = si470x_fops_read,
1232         .poll           = si470x_fops_poll,
1233         .ioctl          = video_ioctl2,
1234         .open           = si470x_fops_open,
1235         .release        = si470x_fops_release,
1236 };
1237
1238
1239
1240 /**************************************************************************
1241  * Video4Linux Interface
1242  **************************************************************************/
1243
1244 /*
1245  * si470x_vidioc_querycap - query device capabilities
1246  */
1247 static int si470x_vidioc_querycap(struct file *file, void *priv,
1248                 struct v4l2_capability *capability)
1249 {
1250         struct si470x_device *radio = video_drvdata(file);
1251
1252         strlcpy(capability->driver, DRIVER_NAME, sizeof(capability->driver));
1253         strlcpy(capability->card, DRIVER_CARD, sizeof(capability->card));
1254         usb_make_path(radio->usbdev, capability->bus_info, sizeof(capability->bus_info));
1255         capability->version = DRIVER_KERNEL_VERSION;
1256         capability->capabilities = V4L2_CAP_HW_FREQ_SEEK |
1257                 V4L2_CAP_TUNER | V4L2_CAP_RADIO | V4L2_CAP_RDS_CAPTURE;
1258
1259         return 0;
1260 }
1261
1262
1263 /*
1264  * si470x_vidioc_queryctrl - enumerate control items
1265  */
1266 static int si470x_vidioc_queryctrl(struct file *file, void *priv,
1267                 struct v4l2_queryctrl *qc)
1268 {
1269         int retval = -EINVAL;
1270
1271         /* abort if qc->id is below V4L2_CID_BASE */
1272         if (qc->id < V4L2_CID_BASE)
1273                 goto done;
1274
1275         /* search video control */
1276         switch (qc->id) {
1277         case V4L2_CID_AUDIO_VOLUME:
1278                 return v4l2_ctrl_query_fill(qc, 0, 15, 1, 15);
1279         case V4L2_CID_AUDIO_MUTE:
1280                 return v4l2_ctrl_query_fill(qc, 0, 1, 1, 1);
1281         }
1282
1283         /* disable unsupported base controls */
1284         /* to satisfy kradio and such apps */
1285         if ((retval == -EINVAL) && (qc->id < V4L2_CID_LASTP1)) {
1286                 qc->flags = V4L2_CTRL_FLAG_DISABLED;
1287                 retval = 0;
1288         }
1289
1290 done:
1291         if (retval < 0)
1292                 printk(KERN_WARNING DRIVER_NAME
1293                         ": query controls failed with %d\n", retval);
1294         return retval;
1295 }
1296
1297
1298 /*
1299  * si470x_vidioc_g_ctrl - get the value of a control
1300  */
1301 static int si470x_vidioc_g_ctrl(struct file *file, void *priv,
1302                 struct v4l2_control *ctrl)
1303 {
1304         struct si470x_device *radio = video_drvdata(file);
1305         int retval = 0;
1306
1307         /* safety checks */
1308         if (radio->disconnected) {
1309                 retval = -EIO;
1310                 goto done;
1311         }
1312
1313         switch (ctrl->id) {
1314         case V4L2_CID_AUDIO_VOLUME:
1315                 ctrl->value = radio->registers[SYSCONFIG2] &
1316                                 SYSCONFIG2_VOLUME;
1317                 break;
1318         case V4L2_CID_AUDIO_MUTE:
1319                 ctrl->value = ((radio->registers[POWERCFG] &
1320                                 POWERCFG_DMUTE) == 0) ? 1 : 0;
1321                 break;
1322         default:
1323                 retval = -EINVAL;
1324         }
1325
1326 done:
1327         if (retval < 0)
1328                 printk(KERN_WARNING DRIVER_NAME
1329                         ": get control failed with %d\n", retval);
1330         return retval;
1331 }
1332
1333
1334 /*
1335  * si470x_vidioc_s_ctrl - set the value of a control
1336  */
1337 static int si470x_vidioc_s_ctrl(struct file *file, void *priv,
1338                 struct v4l2_control *ctrl)
1339 {
1340         struct si470x_device *radio = video_drvdata(file);
1341         int retval = 0;
1342
1343         /* safety checks */
1344         if (radio->disconnected) {
1345                 retval = -EIO;
1346                 goto done;
1347         }
1348
1349         switch (ctrl->id) {
1350         case V4L2_CID_AUDIO_VOLUME:
1351                 radio->registers[SYSCONFIG2] &= ~SYSCONFIG2_VOLUME;
1352                 radio->registers[SYSCONFIG2] |= ctrl->value;
1353                 retval = si470x_set_register(radio, SYSCONFIG2);
1354                 break;
1355         case V4L2_CID_AUDIO_MUTE:
1356                 if (ctrl->value == 1)
1357                         radio->registers[POWERCFG] &= ~POWERCFG_DMUTE;
1358                 else
1359                         radio->registers[POWERCFG] |= POWERCFG_DMUTE;
1360                 retval = si470x_set_register(radio, POWERCFG);
1361                 break;
1362         default:
1363                 retval = -EINVAL;
1364         }
1365
1366 done:
1367         if (retval < 0)
1368                 printk(KERN_WARNING DRIVER_NAME
1369                         ": set control failed with %d\n", retval);
1370         return retval;
1371 }
1372
1373
1374 /*
1375  * si470x_vidioc_g_audio - get audio attributes
1376  */
1377 static int si470x_vidioc_g_audio(struct file *file, void *priv,
1378                 struct v4l2_audio *audio)
1379 {
1380         /* driver constants */
1381         audio->index = 0;
1382         strcpy(audio->name, "Radio");
1383         audio->capability = V4L2_AUDCAP_STEREO;
1384         audio->mode = 0;
1385
1386         return 0;
1387 }
1388
1389
1390 /*
1391  * si470x_vidioc_g_tuner - get tuner attributes
1392  */
1393 static int si470x_vidioc_g_tuner(struct file *file, void *priv,
1394                 struct v4l2_tuner *tuner)
1395 {
1396         struct si470x_device *radio = video_drvdata(file);
1397         int retval = 0;
1398
1399         /* safety checks */
1400         if (radio->disconnected) {
1401                 retval = -EIO;
1402                 goto done;
1403         }
1404         if (tuner->index != 0) {
1405                 retval = -EINVAL;
1406                 goto done;
1407         }
1408
1409         retval = si470x_get_register(radio, STATUSRSSI);
1410         if (retval < 0)
1411                 goto done;
1412
1413         /* driver constants */
1414         strcpy(tuner->name, "FM");
1415         tuner->type = V4L2_TUNER_RADIO;
1416         tuner->capability = V4L2_TUNER_CAP_LOW | V4L2_TUNER_CAP_STEREO |
1417                             V4L2_TUNER_CAP_RDS;
1418
1419         /* range limits */
1420         switch ((radio->registers[SYSCONFIG2] & SYSCONFIG2_BAND) >> 6) {
1421         /* 0: 87.5 - 108 MHz (USA, Europe, default) */
1422         default:
1423                 tuner->rangelow  =  87.5 * FREQ_MUL;
1424                 tuner->rangehigh = 108   * FREQ_MUL;
1425                 break;
1426         /* 1: 76   - 108 MHz (Japan wide band) */
1427         case 1 :
1428                 tuner->rangelow  =  76   * FREQ_MUL;
1429                 tuner->rangehigh = 108   * FREQ_MUL;
1430                 break;
1431         /* 2: 76   -  90 MHz (Japan) */
1432         case 2 :
1433                 tuner->rangelow  =  76   * FREQ_MUL;
1434                 tuner->rangehigh =  90   * FREQ_MUL;
1435                 break;
1436         };
1437
1438         /* stereo indicator == stereo (instead of mono) */
1439         if ((radio->registers[STATUSRSSI] & STATUSRSSI_ST) == 0)
1440                 tuner->rxsubchans = V4L2_TUNER_SUB_MONO;
1441         else
1442                 tuner->rxsubchans = V4L2_TUNER_SUB_MONO | V4L2_TUNER_SUB_STEREO;
1443         /* If there is a reliable method of detecting an RDS channel,
1444            then this code should check for that before setting this
1445            RDS subchannel. */
1446         tuner->rxsubchans |= V4L2_TUNER_SUB_RDS;
1447
1448         /* mono/stereo selector */
1449         if ((radio->registers[POWERCFG] & POWERCFG_MONO) == 0)
1450                 tuner->audmode = V4L2_TUNER_MODE_STEREO;
1451         else
1452                 tuner->audmode = V4L2_TUNER_MODE_MONO;
1453
1454         /* min is worst, max is best; signal:0..0xffff; rssi: 0..0xff */
1455         /* measured in units of dbµV in 1 db increments (max at ~75 dbµV) */
1456         tuner->signal = (radio->registers[STATUSRSSI] & STATUSRSSI_RSSI);
1457         /* the ideal factor is 0xffff/75 = 873,8 */
1458         tuner->signal = (tuner->signal * 873) + (8 * tuner->signal / 10);
1459
1460         /* automatic frequency control: -1: freq to low, 1 freq to high */
1461         /* AFCRL does only indicate that freq. differs, not if too low/high */
1462         tuner->afc = (radio->registers[STATUSRSSI] & STATUSRSSI_AFCRL) ? 1 : 0;
1463
1464 done:
1465         if (retval < 0)
1466                 printk(KERN_WARNING DRIVER_NAME
1467                         ": get tuner failed with %d\n", retval);
1468         return retval;
1469 }
1470
1471
1472 /*
1473  * si470x_vidioc_s_tuner - set tuner attributes
1474  */
1475 static int si470x_vidioc_s_tuner(struct file *file, void *priv,
1476                 struct v4l2_tuner *tuner)
1477 {
1478         struct si470x_device *radio = video_drvdata(file);
1479         int retval = -EINVAL;
1480
1481         /* safety checks */
1482         if (radio->disconnected) {
1483                 retval = -EIO;
1484                 goto done;
1485         }
1486         if (tuner->index != 0)
1487                 goto done;
1488
1489         /* mono/stereo selector */
1490         switch (tuner->audmode) {
1491         case V4L2_TUNER_MODE_MONO:
1492                 radio->registers[POWERCFG] |= POWERCFG_MONO;  /* force mono */
1493                 break;
1494         case V4L2_TUNER_MODE_STEREO:
1495                 radio->registers[POWERCFG] &= ~POWERCFG_MONO; /* try stereo */
1496                 break;
1497         default:
1498                 goto done;
1499         }
1500
1501         retval = si470x_set_register(radio, POWERCFG);
1502
1503 done:
1504         if (retval < 0)
1505                 printk(KERN_WARNING DRIVER_NAME
1506                         ": set tuner failed with %d\n", retval);
1507         return retval;
1508 }
1509
1510
1511 /*
1512  * si470x_vidioc_g_frequency - get tuner or modulator radio frequency
1513  */
1514 static int si470x_vidioc_g_frequency(struct file *file, void *priv,
1515                 struct v4l2_frequency *freq)
1516 {
1517         struct si470x_device *radio = video_drvdata(file);
1518         int retval = 0;
1519
1520         /* safety checks */
1521         if (radio->disconnected) {
1522                 retval = -EIO;
1523                 goto done;
1524         }
1525         if (freq->tuner != 0) {
1526                 retval = -EINVAL;
1527                 goto done;
1528         }
1529
1530         freq->type = V4L2_TUNER_RADIO;
1531         retval = si470x_get_freq(radio, &freq->frequency);
1532
1533 done:
1534         if (retval < 0)
1535                 printk(KERN_WARNING DRIVER_NAME
1536                         ": get frequency failed with %d\n", retval);
1537         return retval;
1538 }
1539
1540
1541 /*
1542  * si470x_vidioc_s_frequency - set tuner or modulator radio frequency
1543  */
1544 static int si470x_vidioc_s_frequency(struct file *file, void *priv,
1545                 struct v4l2_frequency *freq)
1546 {
1547         struct si470x_device *radio = video_drvdata(file);
1548         int retval = 0;
1549
1550         /* safety checks */
1551         if (radio->disconnected) {
1552                 retval = -EIO;
1553                 goto done;
1554         }
1555         if (freq->tuner != 0) {
1556                 retval = -EINVAL;
1557                 goto done;
1558         }
1559
1560         retval = si470x_set_freq(radio, freq->frequency);
1561
1562 done:
1563         if (retval < 0)
1564                 printk(KERN_WARNING DRIVER_NAME
1565                         ": set frequency failed with %d\n", retval);
1566         return retval;
1567 }
1568
1569
1570 /*
1571  * si470x_vidioc_s_hw_freq_seek - set hardware frequency seek
1572  */
1573 static int si470x_vidioc_s_hw_freq_seek(struct file *file, void *priv,
1574                 struct v4l2_hw_freq_seek *seek)
1575 {
1576         struct si470x_device *radio = video_drvdata(file);
1577         int retval = 0;
1578
1579         /* safety checks */
1580         if (radio->disconnected) {
1581                 retval = -EIO;
1582                 goto done;
1583         }
1584         if (seek->tuner != 0) {
1585                 retval = -EINVAL;
1586                 goto done;
1587         }
1588
1589         retval = si470x_set_seek(radio, seek->wrap_around, seek->seek_upward);
1590
1591 done:
1592         if (retval < 0)
1593                 printk(KERN_WARNING DRIVER_NAME
1594                         ": set hardware frequency seek failed with %d\n",
1595                         retval);
1596         return retval;
1597 }
1598
1599
1600 /*
1601  * si470x_ioctl_ops - video device ioctl operations
1602  */
1603 static const struct v4l2_ioctl_ops si470x_ioctl_ops = {
1604         .vidioc_querycap        = si470x_vidioc_querycap,
1605         .vidioc_queryctrl       = si470x_vidioc_queryctrl,
1606         .vidioc_g_ctrl          = si470x_vidioc_g_ctrl,
1607         .vidioc_s_ctrl          = si470x_vidioc_s_ctrl,
1608         .vidioc_g_audio         = si470x_vidioc_g_audio,
1609         .vidioc_g_tuner         = si470x_vidioc_g_tuner,
1610         .vidioc_s_tuner         = si470x_vidioc_s_tuner,
1611         .vidioc_g_frequency     = si470x_vidioc_g_frequency,
1612         .vidioc_s_frequency     = si470x_vidioc_s_frequency,
1613         .vidioc_s_hw_freq_seek  = si470x_vidioc_s_hw_freq_seek,
1614 };
1615
1616
1617 /*
1618  * si470x_viddev_template - video device interface
1619  */
1620 static struct video_device si470x_viddev_template = {
1621         .fops                   = &si470x_fops,
1622         .name                   = DRIVER_NAME,
1623         .release                = video_device_release,
1624         .ioctl_ops              = &si470x_ioctl_ops,
1625 };
1626
1627
1628
1629 /**************************************************************************
1630  * USB Interface
1631  **************************************************************************/
1632
1633 /*
1634  * si470x_usb_driver_probe - probe for the device
1635  */
1636 static int si470x_usb_driver_probe(struct usb_interface *intf,
1637                 const struct usb_device_id *id)
1638 {
1639         struct si470x_device *radio;
1640         struct usb_host_interface *iface_desc;
1641         struct usb_endpoint_descriptor *endpoint;
1642         int i, int_end_size, retval = 0;
1643
1644         /* private data allocation and initialization */
1645         radio = kzalloc(sizeof(struct si470x_device), GFP_KERNEL);
1646         if (!radio) {
1647                 retval = -ENOMEM;
1648                 goto err_initial;
1649         }
1650         radio->users = 0;
1651         radio->disconnected = 0;
1652         radio->usbdev = interface_to_usbdev(intf);
1653         radio->intf = intf;
1654         mutex_init(&radio->disconnect_lock);
1655         mutex_init(&radio->lock);
1656
1657         iface_desc = intf->cur_altsetting;
1658
1659         /* Set up interrupt endpoint information. */
1660         for (i = 0; i < iface_desc->desc.bNumEndpoints; ++i) {
1661                 endpoint = &iface_desc->endpoint[i].desc;
1662                 if (((endpoint->bEndpointAddress & USB_ENDPOINT_DIR_MASK) ==
1663                  USB_DIR_IN) && ((endpoint->bmAttributes &
1664                  USB_ENDPOINT_XFERTYPE_MASK) == USB_ENDPOINT_XFER_INT))
1665                         radio->int_in_endpoint = endpoint;
1666         }
1667         if (!radio->int_in_endpoint) {
1668                 printk(KERN_INFO DRIVER_NAME
1669                         ": could not find interrupt in endpoint\n");
1670                 retval = -EIO;
1671                 goto err_radio;
1672         }
1673
1674         int_end_size = le16_to_cpu(radio->int_in_endpoint->wMaxPacketSize);
1675
1676         radio->int_in_buffer = kmalloc(int_end_size, GFP_KERNEL);
1677         if (!radio->int_in_buffer) {
1678                 printk(KERN_INFO DRIVER_NAME
1679                         "could not allocate int_in_buffer");
1680                 retval = -ENOMEM;
1681                 goto err_radio;
1682         }
1683
1684         radio->int_in_urb = usb_alloc_urb(0, GFP_KERNEL);
1685         if (!radio->int_in_urb) {
1686                 printk(KERN_INFO DRIVER_NAME "could not allocate int_in_urb");
1687                 retval = -ENOMEM;
1688                 goto err_intbuffer;
1689         }
1690
1691         /* video device allocation and initialization */
1692         radio->videodev = video_device_alloc();
1693         if (!radio->videodev) {
1694                 retval = -ENOMEM;
1695                 goto err_intbuffer;
1696         }
1697         memcpy(radio->videodev, &si470x_viddev_template,
1698                         sizeof(si470x_viddev_template));
1699         video_set_drvdata(radio->videodev, radio);
1700
1701         /* show some infos about the specific si470x device */
1702         if (si470x_get_all_registers(radio) < 0) {
1703                 retval = -EIO;
1704                 goto err_video;
1705         }
1706         printk(KERN_INFO DRIVER_NAME ": DeviceID=0x%4.4hx ChipID=0x%4.4hx\n",
1707                         radio->registers[DEVICEID], radio->registers[CHIPID]);
1708
1709         /* get software and hardware versions */
1710         if (si470x_get_scratch_page_versions(radio) < 0) {
1711                 retval = -EIO;
1712                 goto err_video;
1713         }
1714         printk(KERN_INFO DRIVER_NAME
1715                         ": software version %d, hardware version %d\n",
1716                         radio->software_version, radio->hardware_version);
1717
1718         /* check if device and firmware is current */
1719         if ((radio->registers[CHIPID] & CHIPID_FIRMWARE)
1720                         < RADIO_SW_VERSION_CURRENT) {
1721                 printk(KERN_WARNING DRIVER_NAME
1722                         ": This driver is known to work with "
1723                         "firmware version %hu,\n", RADIO_SW_VERSION_CURRENT);
1724                 printk(KERN_WARNING DRIVER_NAME
1725                         ": but the device has firmware version %hu.\n",
1726                         radio->registers[CHIPID] & CHIPID_FIRMWARE);
1727                 printk(KERN_WARNING DRIVER_NAME
1728                         ": If you have some trouble using this driver,\n");
1729                 printk(KERN_WARNING DRIVER_NAME
1730                         ": please report to V4L ML at "
1731                         "linux-media@vger.kernel.org\n");
1732         }
1733
1734         /* set initial frequency */
1735         si470x_set_freq(radio, 87.5 * FREQ_MUL); /* available in all regions */
1736
1737         /* set led to connect state */
1738         si470x_set_led_state(radio, BLINK_GREEN_LED);
1739
1740         /* rds buffer allocation */
1741         radio->buf_size = rds_buf * 3;
1742         radio->buffer = kmalloc(radio->buf_size, GFP_KERNEL);
1743         if (!radio->buffer) {
1744                 retval = -EIO;
1745                 goto err_video;
1746         }
1747
1748         /* rds buffer configuration */
1749         radio->wr_index = 0;
1750         radio->rd_index = 0;
1751         init_waitqueue_head(&radio->read_queue);
1752
1753         /* register video device */
1754         retval = video_register_device(radio->videodev, VFL_TYPE_RADIO, radio_nr);
1755         if (retval) {
1756                 printk(KERN_WARNING DRIVER_NAME
1757                                 ": Could not register video device\n");
1758                 goto err_all;
1759         }
1760         usb_set_intfdata(intf, radio);
1761
1762         return 0;
1763 err_all:
1764         kfree(radio->buffer);
1765 err_video:
1766         video_device_release(radio->videodev);
1767 err_intbuffer:
1768         kfree(radio->int_in_buffer);
1769 err_radio:
1770         kfree(radio);
1771 err_initial:
1772         return retval;
1773 }
1774
1775
1776 /*
1777  * si470x_usb_driver_suspend - suspend the device
1778  */
1779 static int si470x_usb_driver_suspend(struct usb_interface *intf,
1780                 pm_message_t message)
1781 {
1782         printk(KERN_INFO DRIVER_NAME ": suspending now...\n");
1783
1784         return 0;
1785 }
1786
1787
1788 /*
1789  * si470x_usb_driver_resume - resume the device
1790  */
1791 static int si470x_usb_driver_resume(struct usb_interface *intf)
1792 {
1793         printk(KERN_INFO DRIVER_NAME ": resuming now...\n");
1794
1795         return 0;
1796 }
1797
1798
1799 /*
1800  * si470x_usb_driver_disconnect - disconnect the device
1801  */
1802 static void si470x_usb_driver_disconnect(struct usb_interface *intf)
1803 {
1804         struct si470x_device *radio = usb_get_intfdata(intf);
1805
1806         mutex_lock(&radio->disconnect_lock);
1807         radio->disconnected = 1;
1808         usb_set_intfdata(intf, NULL);
1809         if (radio->users == 0) {
1810                 /* set led to disconnect state */
1811                 si470x_set_led_state(radio, BLINK_ORANGE_LED);
1812
1813                 /* Free data structures. */
1814                 usb_free_urb(radio->int_in_urb);
1815
1816                 kfree(radio->int_in_buffer);
1817                 video_unregister_device(radio->videodev);
1818                 kfree(radio->buffer);
1819                 kfree(radio);
1820         }
1821         mutex_unlock(&radio->disconnect_lock);
1822 }
1823
1824
1825 /*
1826  * si470x_usb_driver - usb driver interface
1827  */
1828 static struct usb_driver si470x_usb_driver = {
1829         .name                   = DRIVER_NAME,
1830         .probe                  = si470x_usb_driver_probe,
1831         .disconnect             = si470x_usb_driver_disconnect,
1832         .suspend                = si470x_usb_driver_suspend,
1833         .resume                 = si470x_usb_driver_resume,
1834         .id_table               = si470x_usb_driver_id_table,
1835         .supports_autosuspend   = 1,
1836 };
1837
1838
1839
1840 /**************************************************************************
1841  * Module Interface
1842  **************************************************************************/
1843
1844 /*
1845  * si470x_module_init - module init
1846  */
1847 static int __init si470x_module_init(void)
1848 {
1849         printk(KERN_INFO DRIVER_DESC ", Version " DRIVER_VERSION "\n");
1850         return usb_register(&si470x_usb_driver);
1851 }
1852
1853
1854 /*
1855  * si470x_module_exit - module exit
1856  */
1857 static void __exit si470x_module_exit(void)
1858 {
1859         usb_deregister(&si470x_usb_driver);
1860 }
1861
1862
1863 module_init(si470x_module_init);
1864 module_exit(si470x_module_exit);
1865
1866 MODULE_LICENSE("GPL");
1867 MODULE_AUTHOR(DRIVER_AUTHOR);
1868 MODULE_DESCRIPTION(DRIVER_DESC);
1869 MODULE_VERSION(DRIVER_VERSION);