Alexey Klimov | 2aa72f3 | 2008-10-01 09:40:59 -0300 | [diff] [blame^] | 1 | /* |
| 2 | * A driver for the AverMedia MR 800 USB FM radio. This device plugs |
| 3 | * into both the USB and an analog audio input, so this thing |
| 4 | * only deals with initialization and frequency setting, the |
| 5 | * audio data has to be handled by a sound driver. |
| 6 | * |
| 7 | * Copyright (c) 2008 Alexey Klimov <klimov.linux@gmail.com> |
| 8 | * |
| 9 | * This program is free software; you can redistribute it and/or modify |
| 10 | * it under the terms of the GNU General Public License as published by |
| 11 | * the Free Software Foundation; either version 2 of the License, or |
| 12 | * (at your option) any later version. |
| 13 | * |
| 14 | * This program is distributed in the hope that it will be useful, |
| 15 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 16 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| 17 | * GNU General Public License for more details. |
| 18 | * |
| 19 | * You should have received a copy of the GNU General Public License |
| 20 | * along with this program; if not, write to the Free Software |
| 21 | * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA |
| 22 | */ |
| 23 | |
| 24 | /* |
| 25 | * Big thanks to authors of dsbr100.c and radio-si470x.c |
| 26 | * |
| 27 | * When work was looked pretty good, i discover this: |
| 28 | * http://av-usbradio.sourceforge.net/index.php |
| 29 | * http://sourceforge.net/projects/av-usbradio/ |
| 30 | * Latest release of theirs project was in 2005. |
| 31 | * Probably, this driver could be improved trough using their |
| 32 | * achievements (specifications given). |
| 33 | * So, we have smth to begin with. |
| 34 | * |
| 35 | * History: |
| 36 | * Version 0.01: First working version. |
| 37 | * It's required to blacklist AverMedia USB Radio |
| 38 | * in usbhid/hid-quirks.c |
| 39 | * |
| 40 | * Many things to do: |
| 41 | * - Correct power managment of device (suspend & resume) |
| 42 | * - Make x86 independance (little-endian and big-endian stuff) |
| 43 | * - Add code for scanning and smooth tuning |
| 44 | * - Checked and add stereo&mono stuff |
| 45 | * - Add code for sensitivity value |
| 46 | * - Correct mistakes |
| 47 | * - In Japan another FREQ_MIN and FREQ_MAX |
| 48 | */ |
| 49 | |
| 50 | /* kernel includes */ |
| 51 | #include <linux/kernel.h> |
| 52 | #include <linux/module.h> |
| 53 | #include <linux/init.h> |
| 54 | #include <linux/slab.h> |
| 55 | #include <linux/input.h> |
| 56 | #include <linux/videodev2.h> |
| 57 | #include <media/v4l2-common.h> |
| 58 | #include <media/v4l2-ioctl.h> |
| 59 | #include <linux/usb.h> |
| 60 | #include <linux/version.h> /* for KERNEL_VERSION MACRO */ |
| 61 | |
| 62 | /* driver and module definitions */ |
| 63 | #define DRIVER_AUTHOR "Alexey Klimov <klimov.linux@gmail.com>" |
| 64 | #define DRIVER_DESC "AverMedia MR 800 USB FM radio driver" |
| 65 | #define DRIVER_VERSION "0.01" |
| 66 | #define RADIO_VERSION KERNEL_VERSION(0, 0, 1) |
| 67 | |
| 68 | MODULE_AUTHOR(DRIVER_AUTHOR); |
| 69 | MODULE_DESCRIPTION(DRIVER_DESC); |
| 70 | MODULE_LICENSE("GPL"); |
| 71 | |
| 72 | #define USB_AMRADIO_VENDOR 0x07ca |
| 73 | #define USB_AMRADIO_PRODUCT 0xb800 |
| 74 | |
| 75 | /* Probably USB_TIMEOUT should be modified in module parameter */ |
| 76 | #define BUFFER_LENGTH 8 |
| 77 | #define USB_TIMEOUT 500 |
| 78 | |
| 79 | /* Frequency limits in MHz -- these are European values. For Japanese |
| 80 | devices, that would be 76 and 91. */ |
| 81 | #define FREQ_MIN 87.5 |
| 82 | #define FREQ_MAX 108.0 |
| 83 | #define FREQ_MUL 16000 |
| 84 | |
| 85 | /* module parameter */ |
| 86 | static int radio_nr = -1; |
| 87 | module_param(radio_nr, int, 0); |
| 88 | MODULE_PARM_DESC(radio_nr, "Radio Nr"); |
| 89 | |
| 90 | static struct v4l2_queryctrl radio_qctrl[] = { |
| 91 | { |
| 92 | .id = V4L2_CID_AUDIO_MUTE, |
| 93 | .name = "Mute", |
| 94 | .minimum = 0, |
| 95 | .maximum = 1, |
| 96 | .step = 1, |
| 97 | .default_value = 1, |
| 98 | .type = V4L2_CTRL_TYPE_BOOLEAN, |
| 99 | }, |
| 100 | /* HINT: the disabled controls are only here to satify kradio and such apps */ |
| 101 | { .id = V4L2_CID_AUDIO_VOLUME, |
| 102 | .flags = V4L2_CTRL_FLAG_DISABLED, |
| 103 | }, |
| 104 | { |
| 105 | .id = V4L2_CID_AUDIO_BALANCE, |
| 106 | .flags = V4L2_CTRL_FLAG_DISABLED, |
| 107 | }, |
| 108 | { |
| 109 | .id = V4L2_CID_AUDIO_BASS, |
| 110 | .flags = V4L2_CTRL_FLAG_DISABLED, |
| 111 | }, |
| 112 | { |
| 113 | .id = V4L2_CID_AUDIO_TREBLE, |
| 114 | .flags = V4L2_CTRL_FLAG_DISABLED, |
| 115 | }, |
| 116 | { |
| 117 | .id = V4L2_CID_AUDIO_LOUDNESS, |
| 118 | .flags = V4L2_CTRL_FLAG_DISABLED, |
| 119 | }, |
| 120 | }; |
| 121 | |
| 122 | static int usb_amradio_probe(struct usb_interface *intf, |
| 123 | const struct usb_device_id *id); |
| 124 | static void usb_amradio_disconnect(struct usb_interface *intf); |
| 125 | static int usb_amradio_open(struct inode *inode, struct file *file); |
| 126 | static int usb_amradio_close(struct inode *inode, struct file *file); |
| 127 | static int usb_amradio_suspend(struct usb_interface *intf, |
| 128 | pm_message_t message); |
| 129 | static int usb_amradio_resume(struct usb_interface *intf); |
| 130 | |
| 131 | /* Data for one (physical) device */ |
| 132 | struct amradio_device { |
| 133 | /* reference to USB and video device */ |
| 134 | struct usb_device *usbdev; |
| 135 | struct video_device *videodev; |
| 136 | |
| 137 | unsigned char *buffer; |
| 138 | struct mutex lock; /* buffer locking */ |
| 139 | int curfreq; |
| 140 | int stereo; |
| 141 | int users; |
| 142 | int removed; |
| 143 | int muted; |
| 144 | }; |
| 145 | |
| 146 | /* USB Device ID List */ |
| 147 | static struct usb_device_id usb_amradio_device_table[] = { |
| 148 | {USB_DEVICE_AND_INTERFACE_INFO(USB_AMRADIO_VENDOR, USB_AMRADIO_PRODUCT, |
| 149 | USB_CLASS_HID, 0, 0) }, |
| 150 | { } /* Terminating entry */ |
| 151 | }; |
| 152 | |
| 153 | MODULE_DEVICE_TABLE(usb, usb_amradio_device_table); |
| 154 | |
| 155 | /* USB subsystem interface */ |
| 156 | static struct usb_driver usb_amradio_driver = { |
| 157 | .name = "radio-mr800", |
| 158 | .probe = usb_amradio_probe, |
| 159 | .disconnect = usb_amradio_disconnect, |
| 160 | .suspend = usb_amradio_suspend, |
| 161 | .resume = usb_amradio_resume, |
| 162 | .reset_resume = usb_amradio_resume, |
| 163 | .id_table = usb_amradio_device_table, |
| 164 | .supports_autosuspend = 1, |
| 165 | }; |
| 166 | |
| 167 | /* switch on radio. Send 8 bytes to device. */ |
| 168 | static int amradio_start(struct amradio_device *radio) |
| 169 | { |
| 170 | int retval; |
| 171 | int size; |
| 172 | |
| 173 | mutex_lock(&radio->lock); |
| 174 | |
| 175 | radio->buffer[0] = 0x00; |
| 176 | radio->buffer[1] = 0x55; |
| 177 | radio->buffer[2] = 0xaa; |
| 178 | radio->buffer[3] = 0x00; |
| 179 | radio->buffer[4] = 0xab; |
| 180 | radio->buffer[5] = 0x00; |
| 181 | radio->buffer[6] = 0x00; |
| 182 | radio->buffer[7] = 0x00; |
| 183 | |
| 184 | retval = usb_bulk_msg(radio->usbdev, usb_sndintpipe(radio->usbdev, 2), |
| 185 | (void *) (radio->buffer), BUFFER_LENGTH, &size, USB_TIMEOUT); |
| 186 | |
| 187 | if (retval) { |
| 188 | mutex_unlock(&radio->lock); |
| 189 | return retval; |
| 190 | } |
| 191 | |
| 192 | mutex_unlock(&radio->lock); |
| 193 | |
| 194 | radio->muted = 0; |
| 195 | |
| 196 | return retval; |
| 197 | } |
| 198 | |
| 199 | /* switch off radio */ |
| 200 | static int amradio_stop(struct amradio_device *radio) |
| 201 | { |
| 202 | int retval; |
| 203 | int size; |
| 204 | |
| 205 | mutex_lock(&radio->lock); |
| 206 | |
| 207 | radio->buffer[0] = 0x00; |
| 208 | radio->buffer[1] = 0x55; |
| 209 | radio->buffer[2] = 0xaa; |
| 210 | radio->buffer[3] = 0x00; |
| 211 | radio->buffer[4] = 0xab; |
| 212 | radio->buffer[5] = 0x01; |
| 213 | radio->buffer[6] = 0x00; |
| 214 | radio->buffer[7] = 0x00; |
| 215 | |
| 216 | retval = usb_bulk_msg(radio->usbdev, usb_sndintpipe(radio->usbdev, 2), |
| 217 | (void *) (radio->buffer), BUFFER_LENGTH, &size, USB_TIMEOUT); |
| 218 | |
| 219 | if (retval) { |
| 220 | mutex_unlock(&radio->lock); |
| 221 | return retval; |
| 222 | } |
| 223 | |
| 224 | mutex_unlock(&radio->lock); |
| 225 | |
| 226 | radio->muted = 1; |
| 227 | |
| 228 | return retval; |
| 229 | } |
| 230 | |
| 231 | /* set a frequency, freq is defined by v4l's TUNER_LOW, i.e. 1/16th kHz */ |
| 232 | static int amradio_setfreq(struct amradio_device *radio, int freq) |
| 233 | { |
| 234 | int retval; |
| 235 | int size; |
| 236 | unsigned short freq_send = 0x13 + (freq >> 3) / 25; |
| 237 | |
| 238 | mutex_lock(&radio->lock); |
| 239 | |
| 240 | radio->buffer[0] = 0x00; |
| 241 | radio->buffer[1] = 0x55; |
| 242 | radio->buffer[2] = 0xaa; |
| 243 | radio->buffer[3] = 0x03; |
| 244 | radio->buffer[4] = 0xa4; |
| 245 | radio->buffer[5] = 0x00; |
| 246 | radio->buffer[6] = 0x00; |
| 247 | radio->buffer[7] = 0x08; |
| 248 | |
| 249 | retval = usb_bulk_msg(radio->usbdev, usb_sndintpipe(radio->usbdev, 2), |
| 250 | (void *) (radio->buffer), BUFFER_LENGTH, &size, USB_TIMEOUT); |
| 251 | |
| 252 | if (retval) { |
| 253 | mutex_unlock(&radio->lock); |
| 254 | return retval; |
| 255 | } |
| 256 | |
| 257 | /* frequency is calculated from freq_send and placed in first 2 bytes */ |
| 258 | radio->buffer[0] = (freq_send >> 8) & 0xff; |
| 259 | radio->buffer[1] = freq_send & 0xff; |
| 260 | radio->buffer[2] = 0x01; |
| 261 | radio->buffer[3] = 0x00; |
| 262 | radio->buffer[4] = 0x00; |
| 263 | /* 5 and 6 bytes of buffer already = 0x00 */ |
| 264 | radio->buffer[7] = 0x00; |
| 265 | |
| 266 | retval = usb_bulk_msg(radio->usbdev, usb_sndintpipe(radio->usbdev, 2), |
| 267 | (void *) (radio->buffer), BUFFER_LENGTH, &size, USB_TIMEOUT); |
| 268 | |
| 269 | if (retval) { |
| 270 | mutex_unlock(&radio->lock); |
| 271 | return retval; |
| 272 | } |
| 273 | |
| 274 | mutex_unlock(&radio->lock); |
| 275 | |
| 276 | radio->stereo = 0; |
| 277 | |
| 278 | return retval; |
| 279 | } |
| 280 | |
| 281 | /* USB subsystem interface begins here */ |
| 282 | |
| 283 | /* handle unplugging of the device, release data structures |
| 284 | if nothing keeps us from doing it. If something is still |
| 285 | keeping us busy, the release callback of v4l will take care |
| 286 | of releasing it. */ |
| 287 | static void usb_amradio_disconnect(struct usb_interface *intf) |
| 288 | { |
| 289 | struct amradio_device *radio = usb_get_intfdata(intf); |
| 290 | |
| 291 | usb_set_intfdata(intf, NULL); |
| 292 | |
| 293 | if (radio) { |
| 294 | video_unregister_device(radio->videodev); |
| 295 | radio->videodev = NULL; |
| 296 | if (radio->users) { |
| 297 | kfree(radio->buffer); |
| 298 | kfree(radio); |
| 299 | } else { |
| 300 | radio->removed = 1; |
| 301 | } |
| 302 | } |
| 303 | } |
| 304 | |
| 305 | /* vidioc_querycap - query device capabilities */ |
| 306 | static int vidioc_querycap(struct file *file, void *priv, |
| 307 | struct v4l2_capability *v) |
| 308 | { |
| 309 | strlcpy(v->driver, "radio-mr800", sizeof(v->driver)); |
| 310 | strlcpy(v->card, "AverMedia MR 800 USB FM Radio", sizeof(v->card)); |
| 311 | sprintf(v->bus_info, "USB"); |
| 312 | v->version = RADIO_VERSION; |
| 313 | v->capabilities = V4L2_CAP_TUNER; |
| 314 | return 0; |
| 315 | } |
| 316 | |
| 317 | /* vidioc_g_tuner - get tuner attributes */ |
| 318 | static int vidioc_g_tuner(struct file *file, void *priv, |
| 319 | struct v4l2_tuner *v) |
| 320 | { |
| 321 | struct amradio_device *radio = video_get_drvdata(video_devdata(file)); |
| 322 | |
| 323 | if (v->index > 0) |
| 324 | return -EINVAL; |
| 325 | |
| 326 | /* TODO: Add function which look is signal stereo or not |
| 327 | * amradio_getstat(radio); |
| 328 | */ |
| 329 | radio->stereo = -1; |
| 330 | strcpy(v->name, "FM"); |
| 331 | v->type = V4L2_TUNER_RADIO; |
| 332 | v->rangelow = FREQ_MIN * FREQ_MUL; |
| 333 | v->rangehigh = FREQ_MAX * FREQ_MUL; |
| 334 | v->rxsubchans = V4L2_TUNER_SUB_MONO | V4L2_TUNER_SUB_STEREO; |
| 335 | v->capability = V4L2_TUNER_CAP_LOW; |
| 336 | if (radio->stereo) |
| 337 | v->audmode = V4L2_TUNER_MODE_STEREO; |
| 338 | else |
| 339 | v->audmode = V4L2_TUNER_MODE_MONO; |
| 340 | v->signal = 0xffff; /* Can't get the signal strength, sad.. */ |
| 341 | v->afc = 0; /* Don't know what is this */ |
| 342 | return 0; |
| 343 | } |
| 344 | |
| 345 | /* vidioc_s_tuner - set tuner attributes */ |
| 346 | static int vidioc_s_tuner(struct file *file, void *priv, |
| 347 | struct v4l2_tuner *v) |
| 348 | { |
| 349 | if (v->index > 0) |
| 350 | return -EINVAL; |
| 351 | return 0; |
| 352 | } |
| 353 | |
| 354 | /* vidioc_s_frequency - set tuner radio frequency */ |
| 355 | static int vidioc_s_frequency(struct file *file, void *priv, |
| 356 | struct v4l2_frequency *f) |
| 357 | { |
| 358 | struct amradio_device *radio = video_get_drvdata(video_devdata(file)); |
| 359 | |
| 360 | radio->curfreq = f->frequency; |
| 361 | if (amradio_setfreq(radio, radio->curfreq) < 0) |
| 362 | warn("Set frequency failed"); |
| 363 | return 0; |
| 364 | } |
| 365 | |
| 366 | /* vidioc_g_frequency - get tuner radio frequency */ |
| 367 | static int vidioc_g_frequency(struct file *file, void *priv, |
| 368 | struct v4l2_frequency *f) |
| 369 | { |
| 370 | struct amradio_device *radio = video_get_drvdata(video_devdata(file)); |
| 371 | |
| 372 | f->type = V4L2_TUNER_RADIO; |
| 373 | f->frequency = radio->curfreq; |
| 374 | return 0; |
| 375 | } |
| 376 | |
| 377 | /* vidioc_queryctrl - enumerate control items */ |
| 378 | static int vidioc_queryctrl(struct file *file, void *priv, |
| 379 | struct v4l2_queryctrl *qc) |
| 380 | { |
| 381 | int i; |
| 382 | |
| 383 | for (i = 0; i < ARRAY_SIZE(radio_qctrl); i++) { |
| 384 | if (qc->id && qc->id == radio_qctrl[i].id) { |
| 385 | memcpy(qc, &(radio_qctrl[i]), |
| 386 | sizeof(*qc)); |
| 387 | return 0; |
| 388 | } |
| 389 | } |
| 390 | return -EINVAL; |
| 391 | } |
| 392 | |
| 393 | /* vidioc_g_ctrl - get the value of a control */ |
| 394 | static int vidioc_g_ctrl(struct file *file, void *priv, |
| 395 | struct v4l2_control *ctrl) |
| 396 | { |
| 397 | struct amradio_device *radio = video_get_drvdata(video_devdata(file)); |
| 398 | |
| 399 | switch (ctrl->id) { |
| 400 | case V4L2_CID_AUDIO_MUTE: |
| 401 | ctrl->value = radio->muted; |
| 402 | return 0; |
| 403 | } |
| 404 | return -EINVAL; |
| 405 | } |
| 406 | |
| 407 | /* vidioc_s_ctrl - set the value of a control */ |
| 408 | static int vidioc_s_ctrl(struct file *file, void *priv, |
| 409 | struct v4l2_control *ctrl) |
| 410 | { |
| 411 | struct amradio_device *radio = video_get_drvdata(video_devdata(file)); |
| 412 | |
| 413 | switch (ctrl->id) { |
| 414 | case V4L2_CID_AUDIO_MUTE: |
| 415 | if (ctrl->value) { |
| 416 | if (amradio_stop(radio) < 0) { |
| 417 | warn("amradio_stop() failed"); |
| 418 | return -1; |
| 419 | } |
| 420 | } else { |
| 421 | if (amradio_start(radio) < 0) { |
| 422 | warn("amradio_start() failed"); |
| 423 | return -1; |
| 424 | } |
| 425 | } |
| 426 | return 0; |
| 427 | } |
| 428 | return -EINVAL; |
| 429 | } |
| 430 | |
| 431 | /* vidioc_g_audio - get audio attributes */ |
| 432 | static int vidioc_g_audio(struct file *file, void *priv, |
| 433 | struct v4l2_audio *a) |
| 434 | { |
| 435 | if (a->index > 1) |
| 436 | return -EINVAL; |
| 437 | |
| 438 | strcpy(a->name, "Radio"); |
| 439 | a->capability = V4L2_AUDCAP_STEREO; |
| 440 | return 0; |
| 441 | } |
| 442 | |
| 443 | /* vidioc_s_audio - set audio attributes */ |
| 444 | static int vidioc_s_audio(struct file *file, void *priv, |
| 445 | struct v4l2_audio *a) |
| 446 | { |
| 447 | if (a->index != 0) |
| 448 | return -EINVAL; |
| 449 | return 0; |
| 450 | } |
| 451 | |
| 452 | /* vidioc_g_input - get input */ |
| 453 | static int vidioc_g_input(struct file *filp, void *priv, unsigned int *i) |
| 454 | { |
| 455 | *i = 0; |
| 456 | return 0; |
| 457 | } |
| 458 | |
| 459 | /* vidioc_s_input - set input */ |
| 460 | static int vidioc_s_input(struct file *filp, void *priv, unsigned int i) |
| 461 | { |
| 462 | if (i != 0) |
| 463 | return -EINVAL; |
| 464 | return 0; |
| 465 | } |
| 466 | |
| 467 | /* open device - amradio_start() and amradio_setfreq() */ |
| 468 | static int usb_amradio_open(struct inode *inode, struct file *file) |
| 469 | { |
| 470 | struct amradio_device *radio = video_get_drvdata(video_devdata(file)); |
| 471 | |
| 472 | radio->users = 1; |
| 473 | radio->muted = 1; |
| 474 | |
| 475 | if (amradio_start(radio) < 0) { |
| 476 | warn("Radio did not start up properly"); |
| 477 | radio->users = 0; |
| 478 | return -EIO; |
| 479 | } |
| 480 | if (amradio_setfreq(radio, radio->curfreq) < 0) |
| 481 | warn("Set frequency failed"); |
| 482 | return 0; |
| 483 | } |
| 484 | |
| 485 | /*close device - free driver structures */ |
| 486 | static int usb_amradio_close(struct inode *inode, struct file *file) |
| 487 | { |
| 488 | struct amradio_device *radio = video_get_drvdata(video_devdata(file)); |
| 489 | |
| 490 | if (!radio) |
| 491 | return -ENODEV; |
| 492 | radio->users = 0; |
| 493 | if (radio->removed) { |
| 494 | kfree(radio->buffer); |
| 495 | kfree(radio); |
| 496 | } |
| 497 | return 0; |
| 498 | } |
| 499 | |
| 500 | /* Suspend device - stop device. Need to be checked and fixed */ |
| 501 | static int usb_amradio_suspend(struct usb_interface *intf, pm_message_t message) |
| 502 | { |
| 503 | struct amradio_device *radio = usb_get_intfdata(intf); |
| 504 | |
| 505 | if (amradio_stop(radio) < 0) |
| 506 | warn("amradio_stop() failed"); |
| 507 | |
| 508 | info("radio-mr800: Going into suspend.."); |
| 509 | |
| 510 | return 0; |
| 511 | } |
| 512 | |
| 513 | /* Resume device - start device. Need to be checked and fixed */ |
| 514 | static int usb_amradio_resume(struct usb_interface *intf) |
| 515 | { |
| 516 | struct amradio_device *radio = usb_get_intfdata(intf); |
| 517 | |
| 518 | if (amradio_start(radio) < 0) |
| 519 | warn("amradio_start() failed"); |
| 520 | |
| 521 | info("radio-mr800: Coming out of suspend.."); |
| 522 | |
| 523 | return 0; |
| 524 | } |
| 525 | |
| 526 | /* File system interface */ |
| 527 | static const struct file_operations usb_amradio_fops = { |
| 528 | .owner = THIS_MODULE, |
| 529 | .open = usb_amradio_open, |
| 530 | .release = usb_amradio_close, |
| 531 | .ioctl = video_ioctl2, |
| 532 | #ifdef CONFIG_COMPAT |
| 533 | .compat_ioctl = v4l_compat_ioctl32, |
| 534 | #endif |
| 535 | .llseek = no_llseek, |
| 536 | }; |
| 537 | |
| 538 | static const struct v4l2_ioctl_ops usb_amradio_ioctl_ops = { |
| 539 | .vidioc_querycap = vidioc_querycap, |
| 540 | .vidioc_g_tuner = vidioc_g_tuner, |
| 541 | .vidioc_s_tuner = vidioc_s_tuner, |
| 542 | .vidioc_g_frequency = vidioc_g_frequency, |
| 543 | .vidioc_s_frequency = vidioc_s_frequency, |
| 544 | .vidioc_queryctrl = vidioc_queryctrl, |
| 545 | .vidioc_g_ctrl = vidioc_g_ctrl, |
| 546 | .vidioc_s_ctrl = vidioc_s_ctrl, |
| 547 | .vidioc_g_audio = vidioc_g_audio, |
| 548 | .vidioc_s_audio = vidioc_s_audio, |
| 549 | .vidioc_g_input = vidioc_g_input, |
| 550 | .vidioc_s_input = vidioc_s_input, |
| 551 | }; |
| 552 | |
| 553 | /* V4L2 interface */ |
| 554 | static struct video_device amradio_videodev_template = { |
| 555 | .name = "AverMedia MR 800 USB FM Radio", |
| 556 | .fops = &usb_amradio_fops, |
| 557 | .ioctl_ops = &usb_amradio_ioctl_ops, |
| 558 | .release = video_device_release, |
| 559 | }; |
| 560 | |
| 561 | /* check if the device is present and register with v4l and |
| 562 | usb if it is */ |
| 563 | static int usb_amradio_probe(struct usb_interface *intf, |
| 564 | const struct usb_device_id *id) |
| 565 | { |
| 566 | struct amradio_device *radio; |
| 567 | |
| 568 | radio = kmalloc(sizeof(struct amradio_device), GFP_KERNEL); |
| 569 | |
| 570 | if (!(radio)) |
| 571 | return -ENOMEM; |
| 572 | |
| 573 | radio->buffer = kmalloc(BUFFER_LENGTH, GFP_KERNEL); |
| 574 | |
| 575 | if (!(radio->buffer)) { |
| 576 | kfree(radio); |
| 577 | return -ENOMEM; |
| 578 | } |
| 579 | |
| 580 | radio->videodev = video_device_alloc(); |
| 581 | |
| 582 | if (!(radio->videodev)) { |
| 583 | kfree(radio->buffer); |
| 584 | kfree(radio); |
| 585 | return -ENOMEM; |
| 586 | } |
| 587 | |
| 588 | memcpy(radio->videodev, &amradio_videodev_template, |
| 589 | sizeof(amradio_videodev_template)); |
| 590 | |
| 591 | radio->removed = 0; |
| 592 | radio->users = 0; |
| 593 | radio->usbdev = interface_to_usbdev(intf); |
| 594 | radio->curfreq = 95.16 * FREQ_MUL; |
| 595 | |
| 596 | mutex_init(&radio->lock); |
| 597 | |
| 598 | video_set_drvdata(radio->videodev, radio); |
| 599 | if (video_register_device(radio->videodev, VFL_TYPE_RADIO, radio_nr)) { |
| 600 | warn("Could not register video device"); |
| 601 | video_device_release(radio->videodev); |
| 602 | kfree(radio->buffer); |
| 603 | kfree(radio); |
| 604 | return -EIO; |
| 605 | } |
| 606 | |
| 607 | usb_set_intfdata(intf, radio); |
| 608 | return 0; |
| 609 | } |
| 610 | |
| 611 | static int __init amradio_init(void) |
| 612 | { |
| 613 | int retval = usb_register(&usb_amradio_driver); |
| 614 | |
| 615 | info(DRIVER_VERSION " " DRIVER_DESC); |
| 616 | if (retval) |
| 617 | err("usb_register failed. Error number %d", retval); |
| 618 | return retval; |
| 619 | } |
| 620 | |
| 621 | static void __exit amradio_exit(void) |
| 622 | { |
| 623 | usb_deregister(&usb_amradio_driver); |
| 624 | } |
| 625 | |
| 626 | module_init(amradio_init); |
| 627 | module_exit(amradio_exit); |
| 628 | |