Commit | Line | Data |
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2aa72f3b AK |
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 | ||
0fabb783 AK |
472 | lock_kernel(); |
473 | ||
2aa72f3b AK |
474 | radio->users = 1; |
475 | radio->muted = 1; | |
476 | ||
477 | if (amradio_start(radio) < 0) { | |
478 | warn("Radio did not start up properly"); | |
479 | radio->users = 0; | |
0fabb783 | 480 | unlock_kernel(); |
2aa72f3b AK |
481 | return -EIO; |
482 | } | |
483 | if (amradio_setfreq(radio, radio->curfreq) < 0) | |
484 | warn("Set frequency failed"); | |
0fabb783 AK |
485 | |
486 | unlock_kernel(); | |
2aa72f3b AK |
487 | return 0; |
488 | } | |
489 | ||
490 | /*close device - free driver structures */ | |
491 | static int usb_amradio_close(struct inode *inode, struct file *file) | |
492 | { | |
493 | struct amradio_device *radio = video_get_drvdata(video_devdata(file)); | |
494 | ||
495 | if (!radio) | |
496 | return -ENODEV; | |
497 | radio->users = 0; | |
498 | if (radio->removed) { | |
499 | kfree(radio->buffer); | |
500 | kfree(radio); | |
501 | } | |
502 | return 0; | |
503 | } | |
504 | ||
505 | /* Suspend device - stop device. Need to be checked and fixed */ | |
506 | static int usb_amradio_suspend(struct usb_interface *intf, pm_message_t message) | |
507 | { | |
508 | struct amradio_device *radio = usb_get_intfdata(intf); | |
509 | ||
510 | if (amradio_stop(radio) < 0) | |
511 | warn("amradio_stop() failed"); | |
512 | ||
513 | info("radio-mr800: Going into suspend.."); | |
514 | ||
515 | return 0; | |
516 | } | |
517 | ||
518 | /* Resume device - start device. Need to be checked and fixed */ | |
519 | static int usb_amradio_resume(struct usb_interface *intf) | |
520 | { | |
521 | struct amradio_device *radio = usb_get_intfdata(intf); | |
522 | ||
523 | if (amradio_start(radio) < 0) | |
524 | warn("amradio_start() failed"); | |
525 | ||
526 | info("radio-mr800: Coming out of suspend.."); | |
527 | ||
528 | return 0; | |
529 | } | |
530 | ||
531 | /* File system interface */ | |
532 | static const struct file_operations usb_amradio_fops = { | |
533 | .owner = THIS_MODULE, | |
534 | .open = usb_amradio_open, | |
535 | .release = usb_amradio_close, | |
536 | .ioctl = video_ioctl2, | |
537 | #ifdef CONFIG_COMPAT | |
538 | .compat_ioctl = v4l_compat_ioctl32, | |
539 | #endif | |
540 | .llseek = no_llseek, | |
541 | }; | |
542 | ||
543 | static const struct v4l2_ioctl_ops usb_amradio_ioctl_ops = { | |
544 | .vidioc_querycap = vidioc_querycap, | |
545 | .vidioc_g_tuner = vidioc_g_tuner, | |
546 | .vidioc_s_tuner = vidioc_s_tuner, | |
547 | .vidioc_g_frequency = vidioc_g_frequency, | |
548 | .vidioc_s_frequency = vidioc_s_frequency, | |
549 | .vidioc_queryctrl = vidioc_queryctrl, | |
550 | .vidioc_g_ctrl = vidioc_g_ctrl, | |
551 | .vidioc_s_ctrl = vidioc_s_ctrl, | |
552 | .vidioc_g_audio = vidioc_g_audio, | |
553 | .vidioc_s_audio = vidioc_s_audio, | |
554 | .vidioc_g_input = vidioc_g_input, | |
555 | .vidioc_s_input = vidioc_s_input, | |
556 | }; | |
557 | ||
558 | /* V4L2 interface */ | |
559 | static struct video_device amradio_videodev_template = { | |
560 | .name = "AverMedia MR 800 USB FM Radio", | |
561 | .fops = &usb_amradio_fops, | |
562 | .ioctl_ops = &usb_amradio_ioctl_ops, | |
563 | .release = video_device_release, | |
564 | }; | |
565 | ||
566 | /* check if the device is present and register with v4l and | |
567 | usb if it is */ | |
568 | static int usb_amradio_probe(struct usb_interface *intf, | |
569 | const struct usb_device_id *id) | |
570 | { | |
571 | struct amradio_device *radio; | |
572 | ||
573 | radio = kmalloc(sizeof(struct amradio_device), GFP_KERNEL); | |
574 | ||
575 | if (!(radio)) | |
576 | return -ENOMEM; | |
577 | ||
578 | radio->buffer = kmalloc(BUFFER_LENGTH, GFP_KERNEL); | |
579 | ||
580 | if (!(radio->buffer)) { | |
581 | kfree(radio); | |
582 | return -ENOMEM; | |
583 | } | |
584 | ||
585 | radio->videodev = video_device_alloc(); | |
586 | ||
587 | if (!(radio->videodev)) { | |
588 | kfree(radio->buffer); | |
589 | kfree(radio); | |
590 | return -ENOMEM; | |
591 | } | |
592 | ||
593 | memcpy(radio->videodev, &amradio_videodev_template, | |
594 | sizeof(amradio_videodev_template)); | |
595 | ||
596 | radio->removed = 0; | |
597 | radio->users = 0; | |
598 | radio->usbdev = interface_to_usbdev(intf); | |
599 | radio->curfreq = 95.16 * FREQ_MUL; | |
600 | ||
601 | mutex_init(&radio->lock); | |
602 | ||
603 | video_set_drvdata(radio->videodev, radio); | |
604 | if (video_register_device(radio->videodev, VFL_TYPE_RADIO, radio_nr)) { | |
605 | warn("Could not register video device"); | |
606 | video_device_release(radio->videodev); | |
607 | kfree(radio->buffer); | |
608 | kfree(radio); | |
609 | return -EIO; | |
610 | } | |
611 | ||
612 | usb_set_intfdata(intf, radio); | |
613 | return 0; | |
614 | } | |
615 | ||
616 | static int __init amradio_init(void) | |
617 | { | |
618 | int retval = usb_register(&usb_amradio_driver); | |
619 | ||
620 | info(DRIVER_VERSION " " DRIVER_DESC); | |
621 | if (retval) | |
622 | err("usb_register failed. Error number %d", retval); | |
623 | return retval; | |
624 | } | |
625 | ||
626 | static void __exit amradio_exit(void) | |
627 | { | |
628 | usb_deregister(&usb_amradio_driver); | |
629 | } | |
630 | ||
631 | module_init(amradio_init); | |
632 | module_exit(amradio_exit); | |
633 |