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 0.43:
37 Oliver Neukum: avoided DMA coherency issue
38
39 Version 0.42:
40 Converted dsbr100 to use video_ioctl2
41 by Douglas Landgraf <dougsland@gmail.com>
42
43 Version 0.41-ac1:
44 Alan Cox: Some cleanups and fixes
45
46 Version 0.41:
47 Converted to V4L2 API by Mauro Carvalho Chehab <mchehab@infradead.org>
48
49 Version 0.40:
50 Markus: Updates for 2.6.x kernels, code layout changes, name sanitizing
51
52 Version 0.30:
53 Markus: Updates for 2.5.x kernel and more ISO compliant source
54
55 Version 0.25:
56 PSL and Markus: Cleanup, radio now doesn't stop on device close
57
58 Version 0.24:
59 Markus: Hope I got these silly VIDEO_TUNER_LOW issues finally
60 right. Some minor cleanup, improved standalone compilation
61
62 Version 0.23:
63 Markus: Sign extension bug fixed by declaring transfer_buffer unsigned
64
65 Version 0.22:
66 Markus: Some (brown bag) cleanup in what VIDIOCSTUNER returns,
67 thanks to Mike Cox for pointing the problem out.
68
69 Version 0.21:
70 Markus: Minor cleanup, warnings if something goes wrong, lame attempt
71 to adhere to Documentation/CodingStyle
72
73 Version 0.2:
74 Brad Hards <bradh@dynamite.com.au>: Fixes to make it work as non-module
75 Markus: Copyright clarification
76
77 Version 0.01: Markus: initial release
78
79 */
80
81 #include <linux/kernel.h>
82 #include <linux/module.h>
83 #include <linux/init.h>
84 #include <linux/slab.h>
85 #include <linux/input.h>
86 #include <linux/videodev2.h>
87 #include <media/v4l2-common.h>
88 #include <linux/usb.h>
89
90 /*
91 * Version Information
92 */
93 #include <linux/version.h> /* for KERNEL_VERSION MACRO */
94
95 #define DRIVER_VERSION "v0.41"
96 #define RADIO_VERSION KERNEL_VERSION(0,4,1)
97
98 static struct v4l2_queryctrl radio_qctrl[] = {
99 {
100 .id = V4L2_CID_AUDIO_MUTE,
101 .name = "Mute",
102 .minimum = 0,
103 .maximum = 1,
104 .default_value = 1,
105 .type = V4L2_CTRL_TYPE_BOOLEAN,
106 }
107 };
108
109 #define DRIVER_AUTHOR "Markus Demleitner <msdemlei@tucana.harvard.edu>"
110 #define DRIVER_DESC "D-Link DSB-R100 USB FM radio driver"
111
112 #define DSB100_VENDOR 0x04b4
113 #define DSB100_PRODUCT 0x1002
114
115 /* Commands the device appears to understand */
116 #define DSB100_TUNE 1
117 #define DSB100_ONOFF 2
118
119 #define TB_LEN 16
120
121 /* Frequency limits in MHz -- these are European values. For Japanese
122 devices, that would be 76 and 91. */
123 #define FREQ_MIN 87.5
124 #define FREQ_MAX 108.0
125 #define FREQ_MUL 16000
126
127
128 static int usb_dsbr100_probe(struct usb_interface *intf,
129 const struct usb_device_id *id);
130 static void usb_dsbr100_disconnect(struct usb_interface *intf);
131 static int usb_dsbr100_open(struct inode *inode, struct file *file);
132 static int usb_dsbr100_close(struct inode *inode, struct file *file);
133
134 static int radio_nr = -1;
135 module_param(radio_nr, int, 0);
136
137 /* Data for one (physical) device */
138 struct dsbr100_device {
139 struct usb_device *usbdev;
140 struct video_device *videodev;
141 u8 *transfer_buffer;
142 int curfreq;
143 int stereo;
144 int users;
145 int removed;
146 int muted;
147 };
148
149
150 static struct usb_device_id usb_dsbr100_device_table [] = {
151 { USB_DEVICE(DSB100_VENDOR, DSB100_PRODUCT) },
152 { } /* Terminating entry */
153 };
154
155 MODULE_DEVICE_TABLE (usb, usb_dsbr100_device_table);
156
157 /* USB subsystem interface */
158 static struct usb_driver usb_dsbr100_driver = {
159 .name = "dsbr100",
160 .probe = usb_dsbr100_probe,
161 .disconnect = usb_dsbr100_disconnect,
162 .id_table = usb_dsbr100_device_table,
163 };
164
165 /* Low-level device interface begins here */
166
167 /* switch on radio */
168 static int dsbr100_start(struct dsbr100_device *radio)
169 {
170 if (usb_control_msg(radio->usbdev, usb_rcvctrlpipe(radio->usbdev, 0),
171 USB_REQ_GET_STATUS,
172 USB_TYPE_VENDOR | USB_RECIP_DEVICE | USB_DIR_IN,
173 0x00, 0xC7, radio->transfer_buffer, 8, 300)<0 ||
174 usb_control_msg(radio->usbdev, usb_rcvctrlpipe(radio->usbdev, 0),
175 DSB100_ONOFF,
176 USB_TYPE_VENDOR | USB_RECIP_DEVICE | USB_DIR_IN,
177 0x01, 0x00, radio->transfer_buffer, 8, 300)<0)
178 return -1;
179 radio->muted=0;
180 return (radio->transfer_buffer)[0];
181 }
182
183
184 /* switch off radio */
185 static int dsbr100_stop(struct dsbr100_device *radio)
186 {
187 if (usb_control_msg(radio->usbdev, usb_rcvctrlpipe(radio->usbdev, 0),
188 USB_REQ_GET_STATUS,
189 USB_TYPE_VENDOR | USB_RECIP_DEVICE | USB_DIR_IN,
190 0x16, 0x1C, radio->transfer_buffer, 8, 300)<0 ||
191 usb_control_msg(radio->usbdev, usb_rcvctrlpipe(radio->usbdev, 0),
192 DSB100_ONOFF,
193 USB_TYPE_VENDOR | USB_RECIP_DEVICE | USB_DIR_IN,
194 0x00, 0x00, radio->transfer_buffer, 8, 300)<0)
195 return -1;
196 radio->muted=1;
197 return (radio->transfer_buffer)[0];
198 }
199
200 /* set a frequency, freq is defined by v4l's TUNER_LOW, i.e. 1/16th kHz */
201 static int dsbr100_setfreq(struct dsbr100_device *radio, int freq)
202 {
203 freq = (freq/16*80)/1000+856;
204 if (usb_control_msg(radio->usbdev, usb_rcvctrlpipe(radio->usbdev, 0),
205 DSB100_TUNE,
206 USB_TYPE_VENDOR | USB_RECIP_DEVICE | USB_DIR_IN,
207 (freq>>8)&0x00ff, freq&0xff,
208 radio->transfer_buffer, 8, 300)<0 ||
209 usb_control_msg(radio->usbdev, usb_rcvctrlpipe(radio->usbdev, 0),
210 USB_REQ_GET_STATUS,
211 USB_TYPE_VENDOR | USB_RECIP_DEVICE | USB_DIR_IN,
212 0x96, 0xB7, radio->transfer_buffer, 8, 300)<0 ||
213 usb_control_msg(radio->usbdev, usb_rcvctrlpipe(radio->usbdev, 0),
214 USB_REQ_GET_STATUS,
215 USB_TYPE_VENDOR | USB_RECIP_DEVICE | USB_DIR_IN,
216 0x00, 0x24, radio->transfer_buffer, 8, 300)<0) {
217 radio->stereo = -1;
218 return -1;
219 }
220 radio->stereo = ! ((radio->transfer_buffer)[0]&0x01);
221 return (radio->transfer_buffer)[0];
222 }
223
224 /* return the device status. This is, in effect, just whether it
225 sees a stereo signal or not. Pity. */
226 static void dsbr100_getstat(struct dsbr100_device *radio)
227 {
228 if (usb_control_msg(radio->usbdev, usb_rcvctrlpipe(radio->usbdev, 0),
229 USB_REQ_GET_STATUS,
230 USB_TYPE_VENDOR | USB_RECIP_DEVICE | USB_DIR_IN,
231 0x00 , 0x24, radio->transfer_buffer, 8, 300)<0)
232 radio->stereo = -1;
233 else
234 radio->stereo = ! (radio->transfer_buffer[0]&0x01);
235 }
236
237
238 /* USB subsystem interface begins here */
239
240 /* handle unplugging of the device, release data structures
241 if nothing keeps us from doing it. If something is still
242 keeping us busy, the release callback of v4l will take care
243 of releasing it. */
244 static void usb_dsbr100_disconnect(struct usb_interface *intf)
245 {
246 struct dsbr100_device *radio = usb_get_intfdata(intf);
247
248 usb_set_intfdata (intf, NULL);
249 if (radio) {
250 video_unregister_device(radio->videodev);
251 radio->videodev = NULL;
252 if (radio->users) {
253 kfree(radio->transfer_buffer);
254 kfree(radio);
255 } else {
256 radio->removed = 1;
257 }
258 }
259 }
260
261
262 static int vidioc_querycap(struct file *file, void *priv,
263 struct v4l2_capability *v)
264 {
265 strlcpy(v->driver, "dsbr100", sizeof(v->driver));
266 strlcpy(v->card, "D-Link R-100 USB FM Radio", sizeof(v->card));
267 sprintf(v->bus_info, "ISA");
268 v->version = RADIO_VERSION;
269 v->capabilities = V4L2_CAP_TUNER;
270 return 0;
271 }
272
273 static int vidioc_g_tuner(struct file *file, void *priv,
274 struct v4l2_tuner *v)
275 {
276 struct dsbr100_device *radio = video_get_drvdata(video_devdata(file));
277
278 if (v->index > 0)
279 return -EINVAL;
280
281 dsbr100_getstat(radio);
282 strcpy(v->name, "FM");
283 v->type = V4L2_TUNER_RADIO;
284 v->rangelow = FREQ_MIN*FREQ_MUL;
285 v->rangehigh = FREQ_MAX*FREQ_MUL;
286 v->rxsubchans = V4L2_TUNER_SUB_MONO|V4L2_TUNER_SUB_STEREO;
287 v->capability = V4L2_TUNER_CAP_LOW;
288 if(radio->stereo)
289 v->audmode = V4L2_TUNER_MODE_STEREO;
290 else
291 v->audmode = V4L2_TUNER_MODE_MONO;
292 v->signal = 0xffff; /* We can't get the signal strength */
293 return 0;
294 }
295
296 static int vidioc_s_tuner(struct file *file, void *priv,
297 struct v4l2_tuner *v)
298 {
299 if (v->index > 0)
300 return -EINVAL;
301
302 return 0;
303 }
304
305 static int vidioc_s_frequency(struct file *file, void *priv,
306 struct v4l2_frequency *f)
307 {
308 struct dsbr100_device *radio = video_get_drvdata(video_devdata(file));
309
310 radio->curfreq = f->frequency;
311 if (dsbr100_setfreq(radio, radio->curfreq)==-1)
312 warn("Set frequency failed");
313 return 0;
314 }
315
316 static int vidioc_g_frequency(struct file *file, void *priv,
317 struct v4l2_frequency *f)
318 {
319 struct dsbr100_device *radio = video_get_drvdata(video_devdata(file));
320
321 f->type = V4L2_TUNER_RADIO;
322 f->frequency = radio->curfreq;
323 return 0;
324 }
325
326 static int vidioc_queryctrl(struct file *file, void *priv,
327 struct v4l2_queryctrl *qc)
328 {
329 int i;
330
331 for (i = 0; i < ARRAY_SIZE(radio_qctrl); i++) {
332 if (qc->id && qc->id == radio_qctrl[i].id) {
333 memcpy(qc, &(radio_qctrl[i]),
334 sizeof(*qc));
335 return 0;
336 }
337 }
338 return -EINVAL;
339 }
340
341 static int vidioc_g_ctrl(struct file *file, void *priv,
342 struct v4l2_control *ctrl)
343 {
344 struct dsbr100_device *radio = video_get_drvdata(video_devdata(file));
345
346 switch (ctrl->id) {
347 case V4L2_CID_AUDIO_MUTE:
348 ctrl->value = radio->muted;
349 return 0;
350 }
351 return -EINVAL;
352 }
353
354 static int vidioc_s_ctrl(struct file *file, void *priv,
355 struct v4l2_control *ctrl)
356 {
357 struct dsbr100_device *radio = video_get_drvdata(video_devdata(file));
358
359 switch (ctrl->id) {
360 case V4L2_CID_AUDIO_MUTE:
361 if (ctrl->value) {
362 if (dsbr100_stop(radio)==-1)
363 warn("Radio did not respond properly");
364 } else {
365 if (dsbr100_start(radio)==-1)
366 warn("Radio did not respond properly");
367 }
368 return 0;
369 }
370 return -EINVAL;
371 }
372
373 static int vidioc_g_audio(struct file *file, void *priv,
374 struct v4l2_audio *a)
375 {
376 if (a->index > 1)
377 return -EINVAL;
378
379 strcpy(a->name, "Radio");
380 a->capability = V4L2_AUDCAP_STEREO;
381 return 0;
382 }
383
384 static int vidioc_g_input(struct file *filp, void *priv, unsigned int *i)
385 {
386 *i = 0;
387 return 0;
388 }
389
390 static int vidioc_s_input(struct file *filp, void *priv, unsigned int i)
391 {
392 if (i != 0)
393 return -EINVAL;
394 return 0;
395 }
396
397 static int vidioc_s_audio(struct file *file, void *priv,
398 struct v4l2_audio *a)
399 {
400 if (a->index != 0)
401 return -EINVAL;
402 return 0;
403 }
404
405 static int usb_dsbr100_open(struct inode *inode, struct file *file)
406 {
407 struct dsbr100_device *radio=video_get_drvdata(video_devdata(file));
408
409 radio->users = 1;
410 radio->muted = 1;
411
412 if (dsbr100_start(radio)<0) {
413 warn("Radio did not start up properly");
414 radio->users = 0;
415 return -EIO;
416 }
417 dsbr100_setfreq(radio, radio->curfreq);
418 return 0;
419 }
420
421 static int usb_dsbr100_close(struct inode *inode, struct file *file)
422 {
423 struct dsbr100_device *radio=video_get_drvdata(video_devdata(file));
424
425 if (!radio)
426 return -ENODEV;
427 radio->users = 0;
428 if (radio->removed) {
429 kfree(radio->transfer_buffer);
430 kfree(radio);
431 }
432 return 0;
433 }
434
435 /* File system interface */
436 static const struct file_operations usb_dsbr100_fops = {
437 .owner = THIS_MODULE,
438 .open = usb_dsbr100_open,
439 .release = usb_dsbr100_close,
440 .ioctl = video_ioctl2,
441 .compat_ioctl = v4l_compat_ioctl32,
442 .llseek = no_llseek,
443 };
444
445 /* V4L2 interface */
446 static struct video_device dsbr100_videodev_template =
447 {
448 .owner = THIS_MODULE,
449 .name = "D-Link DSB-R 100",
450 .type = VID_TYPE_TUNER,
451 .fops = &usb_dsbr100_fops,
452 .release = video_device_release,
453 .vidioc_querycap = vidioc_querycap,
454 .vidioc_g_tuner = vidioc_g_tuner,
455 .vidioc_s_tuner = vidioc_s_tuner,
456 .vidioc_g_frequency = vidioc_g_frequency,
457 .vidioc_s_frequency = vidioc_s_frequency,
458 .vidioc_queryctrl = vidioc_queryctrl,
459 .vidioc_g_ctrl = vidioc_g_ctrl,
460 .vidioc_s_ctrl = vidioc_s_ctrl,
461 .vidioc_g_audio = vidioc_g_audio,
462 .vidioc_s_audio = vidioc_s_audio,
463 .vidioc_g_input = vidioc_g_input,
464 .vidioc_s_input = vidioc_s_input,
465 };
466
467 /* check if the device is present and register with v4l and
468 usb if it is */
469 static int usb_dsbr100_probe(struct usb_interface *intf,
470 const struct usb_device_id *id)
471 {
472 struct dsbr100_device *radio;
473
474 if (!(radio = kmalloc(sizeof(struct dsbr100_device), GFP_KERNEL)))
475 return -ENOMEM;
476 if (!(radio->transfer_buffer = kmalloc(TB_LEN, GFP_KERNEL))) {
477 kfree(radio);
478 return -ENOMEM;
479 }
480 if (!(radio->videodev = video_device_alloc())) {
481 kfree(radio->transfer_buffer);
482 kfree(radio);
483 return -ENOMEM;
484 }
485 memcpy(radio->videodev, &dsbr100_videodev_template,
486 sizeof(dsbr100_videodev_template));
487 radio->removed = 0;
488 radio->users = 0;
489 radio->usbdev = interface_to_usbdev(intf);
490 radio->curfreq = FREQ_MIN*FREQ_MUL;
491 video_set_drvdata(radio->videodev, radio);
492 if (video_register_device(radio->videodev, VFL_TYPE_RADIO,radio_nr)) {
493 warn("Could not register video device");
494 video_device_release(radio->videodev);
495 kfree(radio->transfer_buffer);
496 kfree(radio);
497 return -EIO;
498 }
499 usb_set_intfdata(intf, radio);
500 return 0;
501 }
502
503 static int __init dsbr100_init(void)
504 {
505 int retval = usb_register(&usb_dsbr100_driver);
506 info(DRIVER_VERSION ":" DRIVER_DESC);
507 return retval;
508 }
509
510 static void __exit dsbr100_exit(void)
511 {
512 usb_deregister(&usb_dsbr100_driver);
513 }
514
515 module_init (dsbr100_init);
516 module_exit (dsbr100_exit);
517
518 MODULE_AUTHOR( DRIVER_AUTHOR );
519 MODULE_DESCRIPTION( DRIVER_DESC );
520 MODULE_LICENSE("GPL");
521
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