aboutsummaryrefslogtreecommitdiff
path: root/drivers/media/radio/radio-aimslab.c
blob: 3368a89bfadbe356d0b4a7ed46ee3389ea3a3bef (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
429
430
431
432
433
/* radiotrack (radioreveal) driver for Linux radio support
 * (c) 1997 M. Kirkwood
 * Converted to V4L2 API by Mauro Carvalho Chehab <mchehab@infradead.org>
 * Converted to new API by Alan Cox <Alan.Cox@linux.org>
 * Various bugfixes and enhancements by Russell Kroll <rkroll@exploits.org>
 *
 * History:
 * 1999-02-24	Russell Kroll <rkroll@exploits.org>
 * 		Fine tuning/VIDEO_TUNER_LOW
 *		Frequency range expanded to start at 87 MHz
 *
 * TODO: Allow for more than one of these foolish entities :-)
 *
 * Notes on the hardware (reverse engineered from other peoples'
 * reverse engineering of AIMS' code :-)
 *
 *  Frequency control is done digitally -- ie out(port,encodefreq(95.8));
 *
 *  The signal strength query is unsurprisingly inaccurate.  And it seems
 *  to indicate that (on my card, at least) the frequency setting isn't
 *  too great.  (I have to tune up .025MHz from what the freq should be
 *  to get a report that the thing is tuned.)
 *
 *  Volume control is (ugh) analogue:
 *   out(port, start_increasing_volume);
 *   wait(a_wee_while);
 *   out(port, stop_changing_the_volume);
 *
 */

#include <linux/module.h>	/* Modules 			*/
#include <linux/init.h>		/* Initdata			*/
#include <linux/ioport.h>	/* request_region		*/
#include <linux/delay.h>	/* udelay			*/
#include <asm/io.h>		/* outb, outb_p			*/
#include <asm/uaccess.h>	/* copy to/from user		*/
#include <linux/videodev2.h>	/* kernel radio structs		*/
#include <media/v4l2-common.h>
#include <asm/semaphore.h>	/* Lock for the I/O 		*/

#include <linux/version.h>	/* for KERNEL_VERSION MACRO	*/
#define RADIO_VERSION KERNEL_VERSION(0,0,2)

#ifndef CONFIG_RADIO_RTRACK_PORT
#define CONFIG_RADIO_RTRACK_PORT -1
#endif

static int io = CONFIG_RADIO_RTRACK_PORT;
static int radio_nr = -1;
static struct mutex lock;

struct rt_device
{
	int port;
	int curvol;
	unsigned long curfreq;
	int muted;
};


/* local things */

static void sleep_delay(long n)
{
	/* Sleep nicely for 'n' uS */
	int d=n/(1000000/HZ);
	if(!d)
		udelay(n);
	else
		msleep(jiffies_to_msecs(d));
}

static void rt_decvol(void)
{
	outb(0x58, io);		/* volume down + sigstr + on	*/
	sleep_delay(100000);
	outb(0xd8, io);		/* volume steady + sigstr + on	*/
}

static void rt_incvol(void)
{
	outb(0x98, io);		/* volume up + sigstr + on	*/
	sleep_delay(100000);
	outb(0xd8, io);		/* volume steady + sigstr + on	*/
}

static void rt_mute(struct rt_device *dev)
{
	dev->muted = 1;
	mutex_lock(&lock);
	outb(0xd0, io);			/* volume steady, off		*/
	mutex_unlock(&lock);
}

static int rt_setvol(struct rt_device *dev, int vol)
{
	int i;

	mutex_lock(&lock);

	if(vol == dev->curvol) {	/* requested volume = current */
		if (dev->muted) {	/* user is unmuting the card  */
			dev->muted = 0;
			outb (0xd8, io);	/* enable card */
		}
		mutex_unlock(&lock);
		return 0;
	}

	if(vol == 0) {			/* volume = 0 means mute the card */
		outb(0x48, io);		/* volume down but still "on"	*/
		sleep_delay(2000000);	/* make sure it's totally down	*/
		outb(0xd0, io);		/* volume steady, off		*/
		dev->curvol = 0;	/* track the volume state!	*/
		mutex_unlock(&lock);
		return 0;
	}

	dev->muted = 0;
	if(vol > dev->curvol)
		for(i = dev->curvol; i < vol; i++)
			rt_incvol();
	else
		for(i = dev->curvol; i > vol; i--)
			rt_decvol();

	dev->curvol = vol;
	mutex_unlock(&lock);
	return 0;
}

/* the 128+64 on these outb's is to keep the volume stable while tuning
 * without them, the volume _will_ creep up with each frequency change
 * and bit 4 (+16) is to keep the signal strength meter enabled
 */

static void send_0_byte(int port, struct rt_device *dev)
{
	if ((dev->curvol == 0) || (dev->muted)) {
		outb_p(128+64+16+  1, port);   /* wr-enable + data low */
		outb_p(128+64+16+2+1, port);   /* clock */
	}
	else {
		outb_p(128+64+16+8+  1, port);  /* on + wr-enable + data low */
		outb_p(128+64+16+8+2+1, port);  /* clock */
	}
	sleep_delay(1000);
}

static void send_1_byte(int port, struct rt_device *dev)
{
	if ((dev->curvol == 0) || (dev->muted)) {
		outb_p(128+64+16+4  +1, port);   /* wr-enable+data high */
		outb_p(128+64+16+4+2+1, port);   /* clock */
	}
	else {
		outb_p(128+64+16+8+4  +1, port); /* on+wr-enable+data high */
		outb_p(128+64+16+8+4+2+1, port); /* clock */
	}

	sleep_delay(1000);
}

static int rt_setfreq(struct rt_device *dev, unsigned long freq)
{
	int i;

	/* adapted from radio-aztech.c */

	/* now uses VIDEO_TUNER_LOW for fine tuning */

	freq += 171200;			/* Add 10.7 MHz IF 		*/
	freq /= 800;			/* Convert to 50 kHz units	*/

	mutex_lock(&lock);			/* Stop other ops interfering */

	send_0_byte (io, dev);		/*  0: LSB of frequency		*/

	for (i = 0; i < 13; i++)	/*   : frequency bits (1-13)	*/
		if (freq & (1 << i))
			send_1_byte (io, dev);
		else
			send_0_byte (io, dev);

	send_0_byte (io, dev);		/* 14: test bit - always 0    */
	send_0_byte (io, dev);		/* 15: test bit - always 0    */

	send_0_byte (io, dev);		/* 16: band data 0 - always 0 */
	send_0_byte (io, dev);		/* 17: band data 1 - always 0 */
	send_0_byte (io, dev);		/* 18: band data 2 - always 0 */
	send_0_byte (io, dev);		/* 19: time base - always 0   */

	send_0_byte (io, dev);		/* 20: spacing (0 = 25 kHz)   */
	send_1_byte (io, dev);		/* 21: spacing (1 = 25 kHz)   */
	send_0_byte (io, dev);		/* 22: spacing (0 = 25 kHz)   */
	send_1_byte (io, dev);		/* 23: AM/FM (FM = 1, always) */

	if ((dev->curvol == 0) || (dev->muted))
		outb (0xd0, io);	/* volume steady + sigstr */
	else
		outb (0xd8, io);	/* volume steady + sigstr + on */

	mutex_unlock(&lock);

	return 0;
}

static int rt_getsigstr(struct rt_device *dev)
{
	if (inb(io) & 2)	/* bit set = no signal present	*/
		return 0;
	return 1;		/* signal present		*/
}

static struct v4l2_queryctrl radio_qctrl[] = {
	{
		.id            = V4L2_CID_AUDIO_MUTE,
		.name          = "Mute",
		.minimum       = 0,
		.maximum       = 1,
		.default_value = 1,
		.type          = V4L2_CTRL_TYPE_BOOLEAN,
	},{
		.id            = V4L2_CID_AUDIO_VOLUME,
		.name          = "Volume",
		.minimum       = 0,
		.maximum       = 0xff,
		.step          = 1,
		.default_value = 0xff,
		.type          = V4L2_CTRL_TYPE_INTEGER,
	}
};

static int rt_do_ioctl(struct inode *inode, struct file *file,
		       unsigned int cmd, void *arg)
{
	struct video_device *dev = video_devdata(file);
	struct rt_device *rt=dev->priv;

	switch(cmd)
	{
		case VIDIOC_QUERYCAP:
		{
			struct v4l2_capability *v = arg;
			memset(v,0,sizeof(*v));
			strlcpy(v->driver, "radio-aimslab", sizeof (v->driver));
			strlcpy(v->card, "RadioTrack", sizeof (v->card));
			sprintf(v->bus_info,"ISA");
			v->version = RADIO_VERSION;
			v->capabilities = V4L2_CAP_TUNER;

			return 0;
		}
		case VIDIOC_G_TUNER:
		{
			struct v4l2_tuner *v = arg;

			if (v->index > 0)
				return -EINVAL;

			memset(v,0,sizeof(*v));
			strcpy(v->name, "FM");
			v->type = V4L2_TUNER_RADIO;

			v->rangelow=(87*16000);
			v->rangehigh=(108*16000);
			v->rxsubchans =V4L2_TUNER_SUB_MONO;
			v->capability=V4L2_TUNER_CAP_LOW;
			v->audmode = V4L2_TUNER_MODE_MONO;
			v->signal=0xFFFF*rt_getsigstr(rt);

			return 0;
		}
		case VIDIOC_S_TUNER:
		{
			struct v4l2_tuner *v = arg;

			if (v->index > 0)
				return -EINVAL;

			return 0;
		}
		case VIDIOC_S_FREQUENCY:
		{
			struct v4l2_frequency *f = arg;

			rt->curfreq = f->frequency;
			rt_setfreq(rt, rt->curfreq);
			return 0;
		}
		case VIDIOC_G_FREQUENCY:
		{
			struct v4l2_frequency *f = arg;

			f->type = V4L2_TUNER_RADIO;
			f->frequency = rt->curfreq;

			return 0;
		}
		case VIDIOC_QUERYCTRL:
		{
			struct v4l2_queryctrl *qc = arg;
			int i;

			for (i = 0; i < ARRAY_SIZE(radio_qctrl); i++) {
				if (qc->id && qc->id == radio_qctrl[i].id) {
					memcpy(qc, &(radio_qctrl[i]),
								sizeof(*qc));
					return (0);
				}
			}
			return -EINVAL;
		}
		case VIDIOC_G_CTRL:
		{
			struct v4l2_control *ctrl= arg;

			switch (ctrl->id) {
				case V4L2_CID_AUDIO_MUTE:
					ctrl->value=rt->muted;
					return (0);
				case V4L2_CID_AUDIO_VOLUME:
					ctrl->value=rt->curvol * 6554;
					return (0);
			}
			return -EINVAL;
		}
		case VIDIOC_S_CTRL:
		{
			struct v4l2_control *ctrl= arg;

			switch (ctrl->id) {
				case V4L2_CID_AUDIO_MUTE:
					if (ctrl->value) {
						rt_mute(rt);
					} else {
						rt_setvol(rt,rt->curvol);
					}
					return (0);
				case V4L2_CID_AUDIO_VOLUME:
					rt_setvol(rt,ctrl->value);
					return (0);
			}
			return -EINVAL;
		}

		default:
			return v4l_compat_translate_ioctl(inode,file,cmd,arg,
							  rt_do_ioctl);
	}
}

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

static struct rt_device rtrack_unit;

static struct file_operations rtrack_fops = {
	.owner		= THIS_MODULE,
	.open           = video_exclusive_open,
	.release        = video_exclusive_release,
	.ioctl		= rt_ioctl,
	.compat_ioctl	= v4l_compat_ioctl32,
	.llseek         = no_llseek,
};

static struct video_device rtrack_radio=
{
	.owner		= THIS_MODULE,
	.name		= "RadioTrack radio",
	.type		= VID_TYPE_TUNER,
	.hardware	= 0,
	.fops           = &rtrack_fops,
};

static int __init rtrack_init(void)
{
	if(io==-1)
	{
		printk(KERN_ERR "You must set an I/O address with io=0x???\n");
		return -EINVAL;
	}

	if (!request_region(io, 2, "rtrack"))
	{
		printk(KERN_ERR "rtrack: port 0x%x already in use\n", io);
		return -EBUSY;
	}

	rtrack_radio.priv=&rtrack_unit;

	if(video_register_device(&rtrack_radio, VFL_TYPE_RADIO, radio_nr)==-1)
	{
		release_region(io, 2);
		return -EINVAL;
	}
	printk(KERN_INFO "AIMSlab RadioTrack/RadioReveal card driver.\n");

	/* Set up the I/O locking */

	mutex_init(&lock);

	/* mute card - prevents noisy bootups */

	/* this ensures that the volume is all the way down  */
	outb(0x48, io);		/* volume down but still "on"	*/
	sleep_delay(2000000);	/* make sure it's totally down	*/
	outb(0xc0, io);		/* steady volume, mute card	*/
	rtrack_unit.curvol = 0;

	return 0;
}

MODULE_AUTHOR("M.Kirkwood");
MODULE_DESCRIPTION("A driver for the RadioTrack/RadioReveal radio card.");
MODULE_LICENSE("GPL");

module_param(io, int, 0);
MODULE_PARM_DESC(io, "I/O address of the RadioTrack card (0x20f or 0x30f)");
module_param(radio_nr, int, 0);

static void __exit cleanup_rtrack_module(void)
{
	video_unregister_device(&rtrack_radio);
	release_region(io,2);
}

module_init(rtrack_init);
module_exit(cleanup_rtrack_module);