summaryrefslogtreecommitdiffstats
path: root/drivers/usb/media/dsbr100.c
blob: 6a5700e9d4280eb7575426be882920953f1705dd (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
/* A driver for the D-Link DSB-R100 USB radio.  The R100 plugs
 into both the USB and an analog audio input, so this thing
 only deals with initialisation and frequency setting, the
 audio data has to be handled by a sound driver.

 Major issue: I can't find out where the device reports the signal
 strength, and indeed the windows software appearantly just looks
 at the stereo indicator as well.  So, scanning will only find
 stereo stations.  Sad, but I can't help it.

 Also, the windows program sends oodles of messages over to the
 device, and I couldn't figure out their meaning.  My suspicion
 is that they don't have any:-)

 You might find some interesting stuff about this module at
 http://unimut.fsk.uni-heidelberg.de/unimut/demi/dsbr

 Copyright (c) 2000 Markus Demleitner <msdemlei@cl.uni-heidelberg.de>

 This program is free software; you can redistribute it and/or modify
 it under the terms of the GNU General Public License as published by
 the Free Software Foundation; either version 2 of the License, or
 (at your option) any later version.

 This program is distributed in the hope that it will be useful,
 but WITHOUT ANY WARRANTY; without even the implied warranty of
 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 GNU General Public License for more details.

 You should have received a copy of the GNU General Public License
 along with this program; if not, write to the Free Software
 Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA

 History:

 Version 0.40:
  Markus: Updates for 2.6.x kernels, code layout changes, name sanitizing

 Version 0.30:
 	Markus: Updates for 2.5.x kernel and more ISO compliant source

 Version 0.25:
        PSL and Markus: Cleanup, radio now doesn't stop on device close

 Version 0.24:
 	Markus: Hope I got these silly VIDEO_TUNER_LOW issues finally
	right.  Some minor cleanup, improved standalone compilation

 Version 0.23:
 	Markus: Sign extension bug fixed by declaring transfer_buffer unsigned

 Version 0.22:
 	Markus: Some (brown bag) cleanup in what VIDIOCSTUNER returns, 
	thanks to Mike Cox for pointing the problem out.

 Version 0.21:
 	Markus: Minor cleanup, warnings if something goes wrong, lame attempt
	to adhere to Documentation/CodingStyle

 Version 0.2: 
 	Brad Hards <bradh@dynamite.com.au>: Fixes to make it work as non-module
	Markus: Copyright clarification

 Version 0.01: Markus: initial release

*/


#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/init.h>
#include <linux/slab.h>
#include <linux/input.h>
#include <linux/videodev.h>
#include <linux/usb.h>
#include <linux/smp_lock.h>

/*
 * Version Information
 */
#define DRIVER_VERSION "v0.40"
#define DRIVER_AUTHOR "Markus Demleitner <msdemlei@tucana.harvard.edu>"
#define DRIVER_DESC "D-Link DSB-R100 USB FM radio driver"

#define DSB100_VENDOR 0x04b4
#define DSB100_PRODUCT 0x1002

/* Commands the device appears to understand */
#define DSB100_TUNE 1
#define DSB100_ONOFF 2

#define TB_LEN 16

/* Frequency limits in MHz -- these are European values.  For Japanese
devices, that would be 76 and 91.  */
#define FREQ_MIN  87.5
#define FREQ_MAX 108.0
#define FREQ_MUL 16000


static int usb_dsbr100_probe(struct usb_interface *intf,
			     const struct usb_device_id *id);
static void usb_dsbr100_disconnect(struct usb_interface *intf);
static int usb_dsbr100_ioctl(struct inode *inode, struct file *file,
			     unsigned int cmd, unsigned long arg);
static int usb_dsbr100_open(struct inode *inode, struct file *file);
static int usb_dsbr100_close(struct inode *inode, struct file *file);

static int radio_nr = -1;
module_param(radio_nr, int, 0);

/* Data for one (physical) device */
typedef struct {
	struct usb_device *usbdev;
	struct video_device *videodev;
	unsigned char transfer_buffer[TB_LEN];
	int curfreq;
	int stereo;
	int users;
	int removed;
} dsbr100_device;


/* File system interface */
static struct file_operations usb_dsbr100_fops = {
	.owner =	THIS_MODULE,
	.open =		usb_dsbr100_open,
	.release =     	usb_dsbr100_close,
	.ioctl =        usb_dsbr100_ioctl,
	.llseek =       no_llseek,
};

/* V4L interface */
static struct video_device dsbr100_videodev_template=
{
	.owner =	THIS_MODULE,
	.name =		"D-Link DSB-R 100",
	.type =		VID_TYPE_TUNER,
	.hardware =	VID_HARDWARE_AZTECH,
	.fops =         &usb_dsbr100_fops,
	.release = video_device_release,
};

static struct usb_device_id usb_dsbr100_device_table [] = {
	{ USB_DEVICE(DSB100_VENDOR, DSB100_PRODUCT) },
	{ }						/* Terminating entry */
};

MODULE_DEVICE_TABLE (usb, usb_dsbr100_device_table);

/* USB subsystem interface */
static struct usb_driver usb_dsbr100_driver = {
	.name =		"dsbr100",
	.probe =	usb_dsbr100_probe,
	.disconnect =	usb_dsbr100_disconnect,
	.id_table =	usb_dsbr100_device_table,
};

/* Low-level device interface begins here */

/* switch on radio */
static int dsbr100_start(dsbr100_device *radio)
{
	if (usb_control_msg(radio->usbdev, usb_rcvctrlpipe(radio->usbdev, 0),
			USB_REQ_GET_STATUS, 
			USB_TYPE_VENDOR | USB_RECIP_DEVICE | USB_DIR_IN,
			0x00, 0xC7, radio->transfer_buffer, 8, 300)<0 ||
	usb_control_msg(radio->usbdev, usb_rcvctrlpipe(radio->usbdev, 0),
			DSB100_ONOFF, 
			USB_TYPE_VENDOR | USB_RECIP_DEVICE | USB_DIR_IN,
			0x01, 0x00, radio->transfer_buffer, 8, 300)<0)
		return -1;
	return (radio->transfer_buffer)[0];
}


/* switch off radio */
static int dsbr100_stop(dsbr100_device *radio)
{
	if (usb_control_msg(radio->usbdev, usb_rcvctrlpipe(radio->usbdev, 0),
			USB_REQ_GET_STATUS, 
			USB_TYPE_VENDOR | USB_RECIP_DEVICE | USB_DIR_IN,
			0x16, 0x1C, radio->transfer_buffer, 8, 300)<0 ||
	usb_control_msg(radio->usbdev, usb_rcvctrlpipe(radio->usbdev, 0),
			DSB100_ONOFF, 
			USB_TYPE_VENDOR | USB_RECIP_DEVICE | USB_DIR_IN,
			0x00, 0x00, radio->transfer_buffer, 8, 300)<0)
		return -1;
	return (radio->transfer_buffer)[0];
}

/* set a frequency, freq is defined by v4l's TUNER_LOW, i.e. 1/16th kHz */
static int dsbr100_setfreq(dsbr100_device *radio, int freq)
{
	freq = (freq/16*80)/1000+856;
	if (usb_control_msg(radio->usbdev, usb_rcvctrlpipe(radio->usbdev, 0),
			DSB100_TUNE, 
			USB_TYPE_VENDOR | USB_RECIP_DEVICE | USB_DIR_IN,
			(freq>>8)&0x00ff, freq&0xff, 
			radio->transfer_buffer, 8, 300)<0 ||
	   usb_control_msg(radio->usbdev, usb_rcvctrlpipe(radio->usbdev, 0),
		 	USB_REQ_GET_STATUS, 
			USB_TYPE_VENDOR | USB_RECIP_DEVICE | USB_DIR_IN,
			0x96, 0xB7, radio->transfer_buffer, 8, 300)<0 ||
	usb_control_msg(radio->usbdev, usb_rcvctrlpipe(radio->usbdev, 0),
			USB_REQ_GET_STATUS, 
			USB_TYPE_VENDOR | USB_RECIP_DEVICE |  USB_DIR_IN,
			0x00, 0x24, radio->transfer_buffer, 8, 300)<0) {
		radio->stereo = -1;
		return -1;
	}
	radio->stereo = ! ((radio->transfer_buffer)[0]&0x01);
	return (radio->transfer_buffer)[0];
}

/* return the device status.  This is, in effect, just whether it
sees a stereo signal or not.  Pity. */
static void dsbr100_getstat(dsbr100_device *radio)
{
	if (usb_control_msg(radio->usbdev, usb_rcvctrlpipe(radio->usbdev, 0),
		USB_REQ_GET_STATUS, 
		USB_TYPE_VENDOR | USB_RECIP_DEVICE | USB_DIR_IN,
		0x00 , 0x24, radio->transfer_buffer, 8, 300)<0)
		radio->stereo = -1;
	else
		radio->stereo = ! (radio->transfer_buffer[0]&0x01);
}


/* USB subsystem interface begins here */

/* check if the device is present and register with v4l and
usb if it is */
static int usb_dsbr100_probe(struct usb_interface *intf, 
			 const struct usb_device_id *id)
{
	dsbr100_device *radio;

	if (!(radio = kmalloc(sizeof(dsbr100_device), GFP_KERNEL)))
		return -ENOMEM;
	if (!(radio->videodev = video_device_alloc())) {
		kfree(radio);
		return -ENOMEM;
	}
	memcpy(radio->videodev, &dsbr100_videodev_template, 
		sizeof(dsbr100_videodev_template));
	radio->removed = 0;
	radio->users = 0;
	radio->usbdev = interface_to_usbdev(intf);
	radio->curfreq = FREQ_MIN*FREQ_MUL;
	video_set_drvdata(radio->videodev, radio);
	if (video_register_device(radio->videodev, VFL_TYPE_RADIO,
		radio_nr)) {
		warn("Could not register video device");
		video_device_release(radio->videodev);
		kfree(radio);
		return -EIO;
	}
	usb_set_intfdata(intf, radio);
	return 0;
}

/* handle unplugging of the device, release data structures
if nothing keeps us from doing it.  If something is still
keeping us busy, the release callback of v4l will take care
of releasing it.  stv680.c does not relase its private
data, so I don't do this here either.  Checking out the
code I'd expect I better did that, but if there's a memory
leak here it's tiny (~50 bytes per disconnect) */
static void usb_dsbr100_disconnect(struct usb_interface *intf)
{
	dsbr100_device *radio = usb_get_intfdata(intf);

	usb_set_intfdata (intf, NULL);
	if (radio) {
		video_unregister_device(radio->videodev);
		radio->videodev = NULL;
		if (radio->users) {
			kfree(radio);
		} else {
			radio->removed = 1;
		}
	}
}


/* Video for Linux interface */

static int usb_dsbr100_do_ioctl(struct inode *inode, struct file *file,
				unsigned int cmd, void *arg)
{
	dsbr100_device *radio=video_get_drvdata(video_devdata(file));

	if (!radio)
		return -EIO;

	switch(cmd) {
		case VIDIOCGCAP: {
			struct video_capability *v = arg;

			memset(v, 0, sizeof(*v));
			v->type = VID_TYPE_TUNER;
			v->channels = 1;
			v->audios = 1;
			strcpy(v->name, "D-Link R-100 USB FM Radio");
			return 0;
		}
		case VIDIOCGTUNER: {
			struct video_tuner *v = arg;

			dsbr100_getstat(radio);
			if(v->tuner)	/* Only 1 tuner */ 
				return -EINVAL;
			v->rangelow = FREQ_MIN*FREQ_MUL;
			v->rangehigh = FREQ_MAX*FREQ_MUL;
			v->flags = VIDEO_TUNER_LOW;
			v->mode = VIDEO_MODE_AUTO;
			v->signal = radio->stereo*0x7000;
				/* Don't know how to get signal strength */
			v->flags |= VIDEO_TUNER_STEREO_ON*radio->stereo;
			strcpy(v->name, "DSB R-100");
			return 0;
		}
		case VIDIOCSTUNER: {
			struct video_tuner *v = arg;

			if(v->tuner!=0)
				return -EINVAL;
			/* Only 1 tuner so no setting needed ! */
			return 0;
		}
		case VIDIOCGFREQ: {
			int *freq = arg;

			if (radio->curfreq==-1)
				return -EINVAL;
			*freq = radio->curfreq;
			return 0;
		}
		case VIDIOCSFREQ: {
			int *freq = arg;

			radio->curfreq = *freq;
			if (dsbr100_setfreq(radio, radio->curfreq)==-1)
				warn("Set frequency failed");
			return 0;
		}
		case VIDIOCGAUDIO: {
			struct video_audio *v = arg;

			memset(v, 0, sizeof(*v));
			v->flags |= VIDEO_AUDIO_MUTABLE;
			v->mode = VIDEO_SOUND_STEREO;
			v->volume = 1;
			v->step = 1;
			strcpy(v->name, "Radio");
			return 0;			
		}
		case VIDIOCSAUDIO: {
			struct video_audio *v = arg;

			if (v->audio) 
				return -EINVAL;
			if (v->flags&VIDEO_AUDIO_MUTE) {
				if (dsbr100_stop(radio)==-1)
					warn("Radio did not respond properly");
			}
			else
				if (dsbr100_start(radio)==-1)
					warn("Radio did not respond properly");
			return 0;
		}
		default:
			return -ENOIOCTLCMD;
	}
}

static int usb_dsbr100_ioctl(struct inode *inode, struct file *file,
			     unsigned int cmd, unsigned long arg)
{
	return video_usercopy(inode, file, cmd, arg, usb_dsbr100_do_ioctl);
}

static int usb_dsbr100_open(struct inode *inode, struct file *file)
{
	dsbr100_device *radio=video_get_drvdata(video_devdata(file));

	radio->users = 1;
	if (dsbr100_start(radio)<0) {
		warn("Radio did not start up properly");
		radio->users = 0;
		return -EIO;
	}
	dsbr100_setfreq(radio, radio->curfreq);
	return 0;
}

static int usb_dsbr100_close(struct inode *inode, struct file *file)
{
	dsbr100_device *radio=video_get_drvdata(video_devdata(file));

	if (!radio)
		return -ENODEV;
	radio->users = 0;
	if (radio->removed) {
		kfree(radio);
	}
	return 0;
}

static int __init dsbr100_init(void)
{
	int retval = usb_register(&usb_dsbr100_driver);
	info(DRIVER_VERSION ":" DRIVER_DESC);
	return retval;
}

static void __exit dsbr100_exit(void)
{
	usb_deregister(&usb_dsbr100_driver);
}

module_init (dsbr100_init);
module_exit (dsbr100_exit);

MODULE_AUTHOR( DRIVER_AUTHOR );
MODULE_DESCRIPTION( DRIVER_DESC );
MODULE_LICENSE("GPL");
OpenPOWER on IntegriCloud