aboutsummaryrefslogtreecommitdiff
path: root/drivers/media/radio/radio-sf16fmr2.c
blob: 52c7bbb32b8b7ea10312ff58716c47f1ed472bd2 (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
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
/* SF16FMR2 radio driver for Linux radio support
 * heavily based on fmi driver...
 * (c) 2000-2002 Ziglio Frediano, freddy77@angelfire.com
 *
 * Notes on the hardware
 *
 *  Frequency control is done digitally -- ie out(port,encodefreq(95.8));
 *  No volume control - only mute/unmute - you have to use line volume
 *
 *  For read stereo/mono you must wait 0.1 sec after set frequency and
 *  card unmuted so I set frequency on unmute
 *  Signal handling seem to work only on autoscanning (not implemented)
 *
 *  Converted to V4L2 API by Mauro Carvalho Chehab <mchehab@infradead.org>
 */

#include <linux/module.h>	/* Modules 			*/
#include <linux/init.h>		/* Initdata			*/
#include <linux/ioport.h>	/* request_region		*/
#include <linux/delay.h>	/* udelay			*/
#include <linux/videodev2.h>	/* kernel radio structs		*/
#include <linux/mutex.h>
#include <linux/version.h>      /* for KERNEL_VERSION MACRO     */
#include <linux/io.h>		/* outb, outb_p			*/
#include <media/v4l2-device.h>
#include <media/v4l2-ioctl.h>

MODULE_AUTHOR("Ziglio Frediano, freddy77@angelfire.com");
MODULE_DESCRIPTION("A driver for the SF16FMR2 radio.");
MODULE_LICENSE("GPL");

static int io = 0x384;
static int radio_nr = -1;

module_param(io, int, 0);
MODULE_PARM_DESC(io, "I/O address of the SF16FMR2 card (should be 0x384, if do not work try 0x284)");
module_param(radio_nr, int, 0);

#define RADIO_VERSION KERNEL_VERSION(0,0,2)

#define AUD_VOL_INDEX 1

#undef DEBUG
//#define DEBUG 1

#ifdef DEBUG
# define  debug_print(s) printk s
#else
# define  debug_print(s)
#endif

/* this should be static vars for module size */
struct fmr2
{
	struct v4l2_device v4l2_dev;
	struct video_device vdev;
	struct mutex lock;
	int io;
	int curvol; /* 0-15 */
	int mute;
	int stereo; /* card is producing stereo audio */
	unsigned long curfreq; /* freq in kHz */
	int card_type;
};

static struct fmr2 fmr2_card;

/* hw precision is 12.5 kHz
 * It is only useful to give freq in interval of 200 (=0.0125Mhz),
 * other bits will be truncated
 */
#define RSF16_ENCODE(x)	((x) / 200 + 856)
#define RSF16_MINFREQ (87 * 16000)
#define RSF16_MAXFREQ (108 * 16000)

static inline void wait(int n, int io)
{
	for (; n; --n)
		inb(io);
}

static void outbits(int bits, unsigned int data, int nWait, int io)
{
	int bit;

	for (; --bits >= 0;) {
		bit = (data >> bits) & 1;
		outb(bit, io);
		wait(nWait, io);
		outb(bit | 2, io);
		wait(nWait, io);
		outb(bit, io);
		wait(nWait, io);
	}
}

static inline void fmr2_mute(int io)
{
	outb(0x00, io);
	wait(4, io);
}

static inline void fmr2_unmute(int io)
{
	outb(0x04, io);
	wait(4, io);
}

static inline int fmr2_stereo_mode(int io)
{
	int n = inb(io);

	outb(6, io);
	inb(io);
	n = ((n >> 3) & 1) ^ 1;
	debug_print((KERN_DEBUG "stereo: %d\n", n));
	return n;
}

static int fmr2_product_info(struct fmr2 *dev)
{
	int n = inb(dev->io);

	n &= 0xC1;
	if (n == 0) {
		/* this should support volume set */
		dev->card_type = 12;
		return 0;
	}
	/* not volume (mine is 11) */
	dev->card_type = (n == 128) ? 11 : 0;
	return n;
}

static inline int fmr2_getsigstr(struct fmr2 *dev)
{
	/* !!! works only if scanning freq */
	int res = 0xffff;

	outb(5, dev->io);
	wait(4, dev->io);
	if (!(inb(dev->io) & 1))
		res = 0;
	debug_print((KERN_DEBUG "signal: %d\n", res));
	return res;
}

/* set frequency and unmute card */
static int fmr2_setfreq(struct fmr2 *dev)
{
	unsigned long freq = dev->curfreq;

	fmr2_mute(dev->io);

	/* 0x42 for mono output
	 * 0x102 forward scanning
	 * 0x182 scansione avanti
	 */
	outbits(9, 0x2, 3, dev->io);
	outbits(16, RSF16_ENCODE(freq), 2, dev->io);

	fmr2_unmute(dev->io);

	/* wait 0.11 sec */
	msleep(110);

	/* NOTE if mute this stop radio
	   you must set freq on unmute */
	dev->stereo = fmr2_stereo_mode(dev->io);
	return 0;
}

/* !!! not tested, in my card this does't work !!! */
static int fmr2_setvolume(struct fmr2 *dev)
{
	int vol[16] = { 0x021, 0x084, 0x090, 0x104,
			0x110, 0x204, 0x210, 0x402,
			0x404, 0x408, 0x410, 0x801,
			0x802, 0x804, 0x808, 0x810 };
	int i, a;
	int n = vol[dev->curvol & 0x0f];

	if (dev->card_type != 11)
		return 1;

	for (i = 12; --i >= 0; ) {
		a = ((n >> i) & 1) << 6; /* if (a==0) a = 0; else a = 0x40; */
		outb(a | 4, dev->io);
		wait(4, dev->io);
		outb(a | 0x24, dev->io);
		wait(4, dev->io);
		outb(a | 4, dev->io);
		wait(4, dev->io);
	}
	for (i = 6; --i >= 0; ) {
		a = ((0x18 >> i) & 1) << 6;
		outb(a | 4, dev->io);
		wait(4, dev->io);
		outb(a | 0x24, dev->io);
		wait(4, dev->io);
		outb(a | 4, dev->io);
		wait(4, dev->io);
	}
	wait(4, dev->io);
	outb(0x14, dev->io);
	return 0;
}

static int vidioc_querycap(struct file *file, void  *priv,
					struct v4l2_capability *v)
{
	strlcpy(v->driver, "radio-sf16fmr2", sizeof(v->driver));
	strlcpy(v->card, "SF16-FMR2 radio", sizeof(v->card));
	strlcpy(v->bus_info, "ISA", sizeof(v->bus_info));
	v->version = RADIO_VERSION;
	v->capabilities = V4L2_CAP_TUNER | V4L2_CAP_RADIO;
	return 0;
}

static int vidioc_g_tuner(struct file *file, void *priv,
					struct v4l2_tuner *v)
{
	struct fmr2 *fmr2 = video_drvdata(file);

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

	strlcpy(v->name, "FM", sizeof(v->name));
	v->type = V4L2_TUNER_RADIO;

	v->rangelow = RSF16_MINFREQ;
	v->rangehigh = RSF16_MAXFREQ;
	v->rxsubchans = fmr2->stereo ? V4L2_TUNER_SUB_STEREO :
					V4L2_TUNER_SUB_MONO;
	v->capability = V4L2_TUNER_CAP_STEREO | V4L2_TUNER_CAP_LOW;
	v->audmode = V4L2_TUNER_MODE_STEREO;
	mutex_lock(&fmr2->lock);
	v->signal = fmr2_getsigstr(fmr2);
	mutex_unlock(&fmr2->lock);
	return 0;
}

static int vidioc_s_tuner(struct file *file, void *priv,
					struct v4l2_tuner *v)
{
	return v->index ? -EINVAL : 0;
}

static int vidioc_s_frequency(struct file *file, void *priv,
					struct v4l2_frequency *f)
{
	struct fmr2 *fmr2 = video_drvdata(file);

	if (f->tuner != 0 || f->type != V4L2_TUNER_RADIO)
		return -EINVAL;
	if (f->frequency < RSF16_MINFREQ ||
			f->frequency > RSF16_MAXFREQ)
		return -EINVAL;
	/* rounding in steps of 200 to match the freq
	   that will be used */
	fmr2->curfreq = (f->frequency / 200) * 200;

	/* set card freq (if not muted) */
	if (fmr2->curvol && !fmr2->mute) {
		mutex_lock(&fmr2->lock);
		fmr2_setfreq(fmr2);
		mutex_unlock(&fmr2->lock);
	}
	return 0;
}

static int vidioc_g_frequency(struct file *file, void *priv,
					struct v4l2_frequency *f)
{
	struct fmr2 *fmr2 = video_drvdata(file);

	if (f->tuner != 0)
		return -EINVAL;
	f->type = V4L2_TUNER_RADIO;
	f->frequency = fmr2->curfreq;
	return 0;
}

static int vidioc_queryctrl(struct file *file, void *priv,
					struct v4l2_queryctrl *qc)
{
	struct fmr2 *fmr2 = video_drvdata(file);

	switch (qc->id) {
	case V4L2_CID_AUDIO_MUTE:
		return v4l2_ctrl_query_fill(qc, 0, 1, 1, 1);
	case V4L2_CID_AUDIO_VOLUME:
		/* Only card_type == 11 implements volume */
		if (fmr2->card_type == 11)
			return v4l2_ctrl_query_fill(qc, 0, 15, 1, 0);
		return v4l2_ctrl_query_fill(qc, 0, 1, 1, 0);
	}
	return -EINVAL;
}

static int vidioc_g_ctrl(struct file *file, void *priv,
					struct v4l2_control *ctrl)
{
	struct fmr2 *fmr2 = video_drvdata(file);

	switch (ctrl->id) {
	case V4L2_CID_AUDIO_MUTE:
		ctrl->value = fmr2->mute;
		return 0;
	case V4L2_CID_AUDIO_VOLUME:
		ctrl->value = fmr2->curvol;
		return 0;
	}
	return -EINVAL;
}

static int vidioc_s_ctrl(struct file *file, void *priv,
					struct v4l2_control *ctrl)
{
	struct fmr2 *fmr2 = video_drvdata(file);

	switch (ctrl->id) {
	case V4L2_CID_AUDIO_MUTE:
		fmr2->mute = ctrl->value;
		break;
	case V4L2_CID_AUDIO_VOLUME:
		fmr2->curvol = ctrl->value;
		break;
	default:
		return -EINVAL;
	}

#ifdef DEBUG
	if (fmr2->curvol && !fmr2->mute)
		printk(KERN_DEBUG "unmute\n");
	else
		printk(KERN_DEBUG "mute\n");
#endif

	mutex_lock(&fmr2->lock);
	if (fmr2->curvol && !fmr2->mute) {
		fmr2_setvolume(fmr2);
		/* Set frequency and unmute card */
		fmr2_setfreq(fmr2);
	} else
		fmr2_mute(fmr2->io);
	mutex_unlock(&fmr2->lock);
	return 0;
}

static int vidioc_g_input(struct file *filp, void *priv, unsigned int *i)
{
	*i = 0;
	return 0;
}

static int vidioc_s_input(struct file *filp, void *priv, unsigned int i)
{
	return i ? -EINVAL : 0;
}

static int vidioc_g_audio(struct file *file, void *priv,
					struct v4l2_audio *a)
{
	a->index = 0;
	strlcpy(a->name, "Radio", sizeof(a->name));
	a->capability = V4L2_AUDCAP_STEREO;
	return 0;
}

static int vidioc_s_audio(struct file *file, void *priv,
					struct v4l2_audio *a)
{
	return a->index ? -EINVAL : 0;
}

static const struct v4l2_file_operations fmr2_fops = {
	.owner          = THIS_MODULE,
	.ioctl          = video_ioctl2,
};

static const struct v4l2_ioctl_ops fmr2_ioctl_ops = {
	.vidioc_querycap    = vidioc_querycap,
	.vidioc_g_tuner     = vidioc_g_tuner,
	.vidioc_s_tuner     = vidioc_s_tuner,
	.vidioc_g_audio     = vidioc_g_audio,
	.vidioc_s_audio     = vidioc_s_audio,
	.vidioc_g_input     = vidioc_g_input,
	.vidioc_s_input     = vidioc_s_input,
	.vidioc_g_frequency = vidioc_g_frequency,
	.vidioc_s_frequency = vidioc_s_frequency,
	.vidioc_queryctrl   = vidioc_queryctrl,
	.vidioc_g_ctrl      = vidioc_g_ctrl,
	.vidioc_s_ctrl      = vidioc_s_ctrl,
};

static int __init fmr2_init(void)
{
	struct fmr2 *fmr2 = &fmr2_card;
	struct v4l2_device *v4l2_dev = &fmr2->v4l2_dev;
	int res;

	strlcpy(v4l2_dev->name, "sf16fmr2", sizeof(v4l2_dev->name));
	fmr2->io = io;
	fmr2->stereo = 1;
	mutex_init(&fmr2->lock);

	if (!request_region(fmr2->io, 2, "sf16fmr2")) {
		v4l2_err(v4l2_dev, "request_region failed!\n");
		return -EBUSY;
	}

	res = v4l2_device_register(NULL, v4l2_dev);
	if (res < 0) {
		release_region(fmr2->io, 2);
		v4l2_err(v4l2_dev, "Could not register v4l2_device\n");
		return res;
	}

	strlcpy(fmr2->vdev.name, v4l2_dev->name, sizeof(fmr2->vdev.name));
	fmr2->vdev.v4l2_dev = v4l2_dev;
	fmr2->vdev.fops = &fmr2_fops;
	fmr2->vdev.ioctl_ops = &fmr2_ioctl_ops;
	fmr2->vdev.release = video_device_release_empty;
	video_set_drvdata(&fmr2->vdev, fmr2);

	if (video_register_device(&fmr2->vdev, VFL_TYPE_RADIO, radio_nr) < 0) {
		v4l2_device_unregister(v4l2_dev);
		release_region(fmr2->io, 2);
		return -EINVAL;
	}

	v4l2_info(v4l2_dev, "SF16FMR2 radio card driver at 0x%x.\n", fmr2->io);
	/* mute card - prevents noisy bootups */
	mutex_lock(&fmr2->lock);
	fmr2_mute(fmr2->io);
	fmr2_product_info(fmr2);
	mutex_unlock(&fmr2->lock);
	debug_print((KERN_DEBUG "card_type %d\n", fmr2->card_type));
	return 0;
}

static void __exit fmr2_exit(void)
{
	struct fmr2 *fmr2 = &fmr2_card;

	video_unregister_device(&fmr2->vdev);
	v4l2_device_unregister(&fmr2->v4l2_dev);
	release_region(fmr2->io, 2);
}

module_init(fmr2_init);
module_exit(fmr2_exit);

#ifndef MODULE

static int __init fmr2_setup_io(char *str)
{
	get_option(&str, &io);
	return 1;
}

__setup("sf16fmr2=", fmr2_setup_io);

#endif