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1da177e4 LT |
1 | /* A driver for the D-Link DSB-R100 USB radio. The R100 plugs |
2 | into both the USB and an analog audio input, so this thing | |
3 | only deals with initialisation and frequency setting, the | |
4 | audio data has to be handled by a sound driver. | |
5 | ||
6 | Major issue: I can't find out where the device reports the signal | |
7 | strength, and indeed the windows software appearantly just looks | |
8 | at the stereo indicator as well. So, scanning will only find | |
9 | stereo stations. Sad, but I can't help it. | |
10 | ||
11 | Also, the windows program sends oodles of messages over to the | |
12 | device, and I couldn't figure out their meaning. My suspicion | |
13 | is that they don't have any:-) | |
14 | ||
15 | You might find some interesting stuff about this module at | |
16 | http://unimut.fsk.uni-heidelberg.de/unimut/demi/dsbr | |
17 | ||
18 | Copyright (c) 2000 Markus Demleitner <msdemlei@cl.uni-heidelberg.de> | |
19 | ||
20 | This program is free software; you can redistribute it and/or modify | |
21 | it under the terms of the GNU General Public License as published by | |
22 | the Free Software Foundation; either version 2 of the License, or | |
23 | (at your option) any later version. | |
24 | ||
25 | This program is distributed in the hope that it will be useful, | |
26 | but WITHOUT ANY WARRANTY; without even the implied warranty of | |
27 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
28 | GNU General Public License for more details. | |
29 | ||
30 | You should have received a copy of the GNU General Public License | |
31 | along with this program; if not, write to the Free Software | |
32 | Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA | |
33 | ||
34 | History: | |
35 | ||
36 | Version 0.40: | |
37 | Markus: Updates for 2.6.x kernels, code layout changes, name sanitizing | |
38 | ||
39 | Version 0.30: | |
40 | Markus: Updates for 2.5.x kernel and more ISO compliant source | |
41 | ||
42 | Version 0.25: | |
43 | PSL and Markus: Cleanup, radio now doesn't stop on device close | |
44 | ||
45 | Version 0.24: | |
46 | Markus: Hope I got these silly VIDEO_TUNER_LOW issues finally | |
47 | right. Some minor cleanup, improved standalone compilation | |
48 | ||
49 | Version 0.23: | |
50 | Markus: Sign extension bug fixed by declaring transfer_buffer unsigned | |
51 | ||
52 | Version 0.22: | |
53 | Markus: Some (brown bag) cleanup in what VIDIOCSTUNER returns, | |
54 | thanks to Mike Cox for pointing the problem out. | |
55 | ||
56 | Version 0.21: | |
57 | Markus: Minor cleanup, warnings if something goes wrong, lame attempt | |
58 | to adhere to Documentation/CodingStyle | |
59 | ||
60 | Version 0.2: | |
61 | Brad Hards <bradh@dynamite.com.au>: Fixes to make it work as non-module | |
62 | Markus: Copyright clarification | |
63 | ||
64 | Version 0.01: Markus: initial release | |
65 | ||
66 | */ | |
67 | ||
68 | ||
69 | #include <linux/kernel.h> | |
70 | #include <linux/module.h> | |
71 | #include <linux/init.h> | |
72 | #include <linux/slab.h> | |
73 | #include <linux/input.h> | |
74 | #include <linux/videodev.h> | |
75 | #include <linux/usb.h> | |
76 | #include <linux/smp_lock.h> | |
77 | ||
78 | /* | |
79 | * Version Information | |
80 | */ | |
81 | #define DRIVER_VERSION "v0.40" | |
82 | #define DRIVER_AUTHOR "Markus Demleitner <msdemlei@tucana.harvard.edu>" | |
83 | #define DRIVER_DESC "D-Link DSB-R100 USB FM radio driver" | |
84 | ||
85 | #define DSB100_VENDOR 0x04b4 | |
86 | #define DSB100_PRODUCT 0x1002 | |
87 | ||
88 | /* Commands the device appears to understand */ | |
89 | #define DSB100_TUNE 1 | |
90 | #define DSB100_ONOFF 2 | |
91 | ||
92 | #define TB_LEN 16 | |
93 | ||
94 | /* Frequency limits in MHz -- these are European values. For Japanese | |
95 | devices, that would be 76 and 91. */ | |
96 | #define FREQ_MIN 87.5 | |
97 | #define FREQ_MAX 108.0 | |
98 | #define FREQ_MUL 16000 | |
99 | ||
100 | ||
101 | static int usb_dsbr100_probe(struct usb_interface *intf, | |
102 | const struct usb_device_id *id); | |
103 | static void usb_dsbr100_disconnect(struct usb_interface *intf); | |
104 | static int usb_dsbr100_ioctl(struct inode *inode, struct file *file, | |
105 | unsigned int cmd, unsigned long arg); | |
106 | static int usb_dsbr100_open(struct inode *inode, struct file *file); | |
107 | static int usb_dsbr100_close(struct inode *inode, struct file *file); | |
108 | ||
109 | static int radio_nr = -1; | |
110 | module_param(radio_nr, int, 0); | |
111 | ||
112 | /* Data for one (physical) device */ | |
113 | typedef struct { | |
114 | struct usb_device *usbdev; | |
115 | struct video_device *videodev; | |
116 | unsigned char transfer_buffer[TB_LEN]; | |
117 | int curfreq; | |
118 | int stereo; | |
119 | int users; | |
120 | int removed; | |
121 | } dsbr100_device; | |
122 | ||
123 | ||
124 | /* File system interface */ | |
125 | static struct file_operations usb_dsbr100_fops = { | |
126 | .owner = THIS_MODULE, | |
127 | .open = usb_dsbr100_open, | |
128 | .release = usb_dsbr100_close, | |
129 | .ioctl = usb_dsbr100_ioctl, | |
130 | .llseek = no_llseek, | |
131 | }; | |
132 | ||
133 | /* V4L interface */ | |
134 | static struct video_device dsbr100_videodev_template= | |
135 | { | |
136 | .owner = THIS_MODULE, | |
137 | .name = "D-Link DSB-R 100", | |
138 | .type = VID_TYPE_TUNER, | |
139 | .hardware = VID_HARDWARE_AZTECH, | |
140 | .fops = &usb_dsbr100_fops, | |
141 | .release = video_device_release, | |
142 | }; | |
143 | ||
144 | static struct usb_device_id usb_dsbr100_device_table [] = { | |
145 | { USB_DEVICE(DSB100_VENDOR, DSB100_PRODUCT) }, | |
146 | { } /* Terminating entry */ | |
147 | }; | |
148 | ||
149 | MODULE_DEVICE_TABLE (usb, usb_dsbr100_device_table); | |
150 | ||
151 | /* USB subsystem interface */ | |
152 | static struct usb_driver usb_dsbr100_driver = { | |
153 | .owner = THIS_MODULE, | |
154 | .name = "dsbr100", | |
155 | .probe = usb_dsbr100_probe, | |
156 | .disconnect = usb_dsbr100_disconnect, | |
157 | .id_table = usb_dsbr100_device_table, | |
158 | }; | |
159 | ||
160 | /* Low-level device interface begins here */ | |
161 | ||
162 | /* switch on radio */ | |
163 | static int dsbr100_start(dsbr100_device *radio) | |
164 | { | |
165 | if (usb_control_msg(radio->usbdev, usb_rcvctrlpipe(radio->usbdev, 0), | |
166 | USB_REQ_GET_STATUS, | |
167 | USB_TYPE_VENDOR | USB_RECIP_DEVICE | USB_DIR_IN, | |
168 | 0x00, 0xC7, radio->transfer_buffer, 8, 300)<0 || | |
169 | usb_control_msg(radio->usbdev, usb_rcvctrlpipe(radio->usbdev, 0), | |
170 | DSB100_ONOFF, | |
171 | USB_TYPE_VENDOR | USB_RECIP_DEVICE | USB_DIR_IN, | |
172 | 0x01, 0x00, radio->transfer_buffer, 8, 300)<0) | |
173 | return -1; | |
174 | return (radio->transfer_buffer)[0]; | |
175 | } | |
176 | ||
177 | ||
178 | /* switch off radio */ | |
179 | static int dsbr100_stop(dsbr100_device *radio) | |
180 | { | |
181 | if (usb_control_msg(radio->usbdev, usb_rcvctrlpipe(radio->usbdev, 0), | |
182 | USB_REQ_GET_STATUS, | |
183 | USB_TYPE_VENDOR | USB_RECIP_DEVICE | USB_DIR_IN, | |
184 | 0x16, 0x1C, radio->transfer_buffer, 8, 300)<0 || | |
185 | usb_control_msg(radio->usbdev, usb_rcvctrlpipe(radio->usbdev, 0), | |
186 | DSB100_ONOFF, | |
187 | USB_TYPE_VENDOR | USB_RECIP_DEVICE | USB_DIR_IN, | |
188 | 0x00, 0x00, radio->transfer_buffer, 8, 300)<0) | |
189 | return -1; | |
190 | return (radio->transfer_buffer)[0]; | |
191 | } | |
192 | ||
193 | /* set a frequency, freq is defined by v4l's TUNER_LOW, i.e. 1/16th kHz */ | |
194 | static int dsbr100_setfreq(dsbr100_device *radio, int freq) | |
195 | { | |
196 | freq = (freq/16*80)/1000+856; | |
197 | if (usb_control_msg(radio->usbdev, usb_rcvctrlpipe(radio->usbdev, 0), | |
198 | DSB100_TUNE, | |
199 | USB_TYPE_VENDOR | USB_RECIP_DEVICE | USB_DIR_IN, | |
200 | (freq>>8)&0x00ff, freq&0xff, | |
201 | radio->transfer_buffer, 8, 300)<0 || | |
202 | usb_control_msg(radio->usbdev, usb_rcvctrlpipe(radio->usbdev, 0), | |
203 | USB_REQ_GET_STATUS, | |
204 | USB_TYPE_VENDOR | USB_RECIP_DEVICE | USB_DIR_IN, | |
205 | 0x96, 0xB7, radio->transfer_buffer, 8, 300)<0 || | |
206 | usb_control_msg(radio->usbdev, usb_rcvctrlpipe(radio->usbdev, 0), | |
207 | USB_REQ_GET_STATUS, | |
208 | USB_TYPE_VENDOR | USB_RECIP_DEVICE | USB_DIR_IN, | |
209 | 0x00, 0x24, radio->transfer_buffer, 8, 300)<0) { | |
210 | radio->stereo = -1; | |
211 | return -1; | |
212 | } | |
213 | radio->stereo = ! ((radio->transfer_buffer)[0]&0x01); | |
214 | return (radio->transfer_buffer)[0]; | |
215 | } | |
216 | ||
217 | /* return the device status. This is, in effect, just whether it | |
218 | sees a stereo signal or not. Pity. */ | |
219 | static void dsbr100_getstat(dsbr100_device *radio) | |
220 | { | |
221 | if (usb_control_msg(radio->usbdev, usb_rcvctrlpipe(radio->usbdev, 0), | |
222 | USB_REQ_GET_STATUS, | |
223 | USB_TYPE_VENDOR | USB_RECIP_DEVICE | USB_DIR_IN, | |
224 | 0x00 , 0x24, radio->transfer_buffer, 8, 300)<0) | |
225 | radio->stereo = -1; | |
226 | else | |
227 | radio->stereo = ! (radio->transfer_buffer[0]&0x01); | |
228 | } | |
229 | ||
230 | ||
231 | /* USB subsystem interface begins here */ | |
232 | ||
233 | /* check if the device is present and register with v4l and | |
234 | usb if it is */ | |
235 | static int usb_dsbr100_probe(struct usb_interface *intf, | |
236 | const struct usb_device_id *id) | |
237 | { | |
238 | dsbr100_device *radio; | |
239 | ||
240 | if (!(radio = kmalloc(sizeof(dsbr100_device), GFP_KERNEL))) | |
241 | return -ENOMEM; | |
242 | if (!(radio->videodev = video_device_alloc())) { | |
243 | kfree(radio); | |
244 | return -ENOMEM; | |
245 | } | |
246 | memcpy(radio->videodev, &dsbr100_videodev_template, | |
247 | sizeof(dsbr100_videodev_template)); | |
248 | radio->removed = 0; | |
249 | radio->users = 0; | |
250 | radio->usbdev = interface_to_usbdev(intf); | |
251 | radio->curfreq = FREQ_MIN*FREQ_MUL; | |
252 | video_set_drvdata(radio->videodev, radio); | |
253 | if (video_register_device(radio->videodev, VFL_TYPE_RADIO, | |
254 | radio_nr)) { | |
255 | warn("Could not register video device"); | |
256 | video_device_release(radio->videodev); | |
257 | kfree(radio); | |
258 | return -EIO; | |
259 | } | |
260 | usb_set_intfdata(intf, radio); | |
261 | return 0; | |
262 | } | |
263 | ||
264 | /* handle unplugging of the device, release data structures | |
265 | if nothing keeps us from doing it. If something is still | |
266 | keeping us busy, the release callback of v4l will take care | |
267 | of releasing it. stv680.c does not relase its private | |
268 | data, so I don't do this here either. Checking out the | |
269 | code I'd expect I better did that, but if there's a memory | |
270 | leak here it's tiny (~50 bytes per disconnect) */ | |
271 | static void usb_dsbr100_disconnect(struct usb_interface *intf) | |
272 | { | |
273 | dsbr100_device *radio = usb_get_intfdata(intf); | |
274 | ||
275 | usb_set_intfdata (intf, NULL); | |
276 | if (radio) { | |
277 | video_unregister_device(radio->videodev); | |
278 | radio->videodev = NULL; | |
279 | if (radio->users) { | |
280 | kfree(radio); | |
281 | } else { | |
282 | radio->removed = 1; | |
283 | } | |
284 | } | |
285 | } | |
286 | ||
287 | ||
288 | /* Video for Linux interface */ | |
289 | ||
290 | static int usb_dsbr100_do_ioctl(struct inode *inode, struct file *file, | |
291 | unsigned int cmd, void *arg) | |
292 | { | |
293 | dsbr100_device *radio=video_get_drvdata(video_devdata(file)); | |
294 | ||
295 | if (!radio) | |
296 | return -EIO; | |
297 | ||
298 | switch(cmd) { | |
299 | case VIDIOCGCAP: { | |
300 | struct video_capability *v = arg; | |
301 | ||
302 | memset(v, 0, sizeof(*v)); | |
303 | v->type = VID_TYPE_TUNER; | |
304 | v->channels = 1; | |
305 | v->audios = 1; | |
306 | strcpy(v->name, "D-Link R-100 USB FM Radio"); | |
307 | return 0; | |
308 | } | |
309 | case VIDIOCGTUNER: { | |
310 | struct video_tuner *v = arg; | |
311 | ||
312 | dsbr100_getstat(radio); | |
313 | if(v->tuner) /* Only 1 tuner */ | |
314 | return -EINVAL; | |
315 | v->rangelow = FREQ_MIN*FREQ_MUL; | |
316 | v->rangehigh = FREQ_MAX*FREQ_MUL; | |
317 | v->flags = VIDEO_TUNER_LOW; | |
318 | v->mode = VIDEO_MODE_AUTO; | |
319 | v->signal = radio->stereo*0x7000; | |
320 | /* Don't know how to get signal strength */ | |
321 | v->flags |= VIDEO_TUNER_STEREO_ON*radio->stereo; | |
322 | strcpy(v->name, "DSB R-100"); | |
323 | return 0; | |
324 | } | |
325 | case VIDIOCSTUNER: { | |
326 | struct video_tuner *v = arg; | |
327 | ||
328 | if(v->tuner!=0) | |
329 | return -EINVAL; | |
330 | /* Only 1 tuner so no setting needed ! */ | |
331 | return 0; | |
332 | } | |
333 | case VIDIOCGFREQ: { | |
334 | int *freq = arg; | |
335 | ||
336 | if (radio->curfreq==-1) | |
337 | return -EINVAL; | |
338 | *freq = radio->curfreq; | |
339 | return 0; | |
340 | } | |
341 | case VIDIOCSFREQ: { | |
342 | int *freq = arg; | |
343 | ||
344 | radio->curfreq = *freq; | |
345 | if (dsbr100_setfreq(radio, radio->curfreq)==-1) | |
346 | warn("Set frequency failed"); | |
347 | return 0; | |
348 | } | |
349 | case VIDIOCGAUDIO: { | |
350 | struct video_audio *v = arg; | |
351 | ||
352 | memset(v, 0, sizeof(*v)); | |
353 | v->flags |= VIDEO_AUDIO_MUTABLE; | |
354 | v->mode = VIDEO_SOUND_STEREO; | |
355 | v->volume = 1; | |
356 | v->step = 1; | |
357 | strcpy(v->name, "Radio"); | |
358 | return 0; | |
359 | } | |
360 | case VIDIOCSAUDIO: { | |
361 | struct video_audio *v = arg; | |
362 | ||
363 | if (v->audio) | |
364 | return -EINVAL; | |
365 | if (v->flags&VIDEO_AUDIO_MUTE) { | |
366 | if (dsbr100_stop(radio)==-1) | |
367 | warn("Radio did not respond properly"); | |
368 | } | |
369 | else | |
370 | if (dsbr100_start(radio)==-1) | |
371 | warn("Radio did not respond properly"); | |
372 | return 0; | |
373 | } | |
374 | default: | |
375 | return -ENOIOCTLCMD; | |
376 | } | |
377 | } | |
378 | ||
379 | static int usb_dsbr100_ioctl(struct inode *inode, struct file *file, | |
380 | unsigned int cmd, unsigned long arg) | |
381 | { | |
382 | return video_usercopy(inode, file, cmd, arg, usb_dsbr100_do_ioctl); | |
383 | } | |
384 | ||
385 | static int usb_dsbr100_open(struct inode *inode, struct file *file) | |
386 | { | |
387 | dsbr100_device *radio=video_get_drvdata(video_devdata(file)); | |
388 | ||
389 | radio->users = 1; | |
390 | if (dsbr100_start(radio)<0) { | |
391 | warn("Radio did not start up properly"); | |
392 | radio->users = 0; | |
393 | return -EIO; | |
394 | } | |
395 | dsbr100_setfreq(radio, radio->curfreq); | |
396 | return 0; | |
397 | } | |
398 | ||
399 | static int usb_dsbr100_close(struct inode *inode, struct file *file) | |
400 | { | |
401 | dsbr100_device *radio=video_get_drvdata(video_devdata(file)); | |
402 | ||
403 | if (!radio) | |
404 | return -ENODEV; | |
405 | radio->users = 0; | |
406 | if (radio->removed) { | |
407 | kfree(radio); | |
408 | } | |
409 | return 0; | |
410 | } | |
411 | ||
412 | static int __init dsbr100_init(void) | |
413 | { | |
414 | int retval = usb_register(&usb_dsbr100_driver); | |
415 | info(DRIVER_VERSION ":" DRIVER_DESC); | |
416 | return retval; | |
417 | } | |
418 | ||
419 | static void __exit dsbr100_exit(void) | |
420 | { | |
421 | usb_deregister(&usb_dsbr100_driver); | |
422 | } | |
423 | ||
424 | module_init (dsbr100_init); | |
425 | module_exit (dsbr100_exit); | |
426 | ||
427 | MODULE_AUTHOR( DRIVER_AUTHOR ); | |
428 | MODULE_DESCRIPTION( DRIVER_DESC ); | |
429 | MODULE_LICENSE("GPL"); |