Free Electrons

Embedded Linux Experts

  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
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
/* 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 <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 <linux/mutex.h>

static struct mutex lock;

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

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       = 65535,
		.step          = 1<<12,
		.default_value = 0xff,
		.type          = V4L2_CTRL_TYPE_INTEGER,
	}
};

#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_device
{
	int port;
	int curvol; /* 0-65535, if not volume 0 or 65535 */
	int mute;
	int stereo; /* card is producing stereo audio */
	unsigned long curfreq; /* freq in kHz */
	int card_type;
	__u32 flags;
};

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

/* hw precision is 12.5 kHz
 * It is only useful to give freq in intervall 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 port)
{
	for (;n;--n) inb(port);
}

static void outbits(int bits, unsigned int data, int nWait, int port)
{
	int bit;
	for(;--bits>=0;) {
		bit = (data>>bits) & 1;
		outb(bit,port);
		wait(nWait,port);
		outb(bit|2,port);
		wait(nWait,port);
		outb(bit,port);
		wait(nWait,port);
	}
}

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

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

static inline int fmr2_stereo_mode(int port)
{
	int n = inb(port);
	outb(6,port);
	inb(port);
	n = ((n>>3)&1)^1;
	debug_print((KERN_DEBUG "stereo: %d\n", n));
	return n;
}

static int fmr2_product_info(struct fmr2_device *dev)
{
	int n = inb(dev->port);
	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_device *dev)
{
	/* !!! work only if scanning freq */
	int port = dev->port, res = 0xffff;
	outb(5,port);
	wait(4,port);
	if (!(inb(port)&1)) res = 0;
	debug_print((KERN_DEBUG "signal: %d\n", res));
	return res;
}

/* set frequency and unmute card */
static int fmr2_setfreq(struct fmr2_device *dev)
{
	int port = dev->port;
	unsigned long freq = dev->curfreq;

	fmr2_mute(port);

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

	fmr2_unmute(port);

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

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

/* !!! not tested, in my card this does't work !!! */
static int fmr2_setvolume(struct fmr2_device *dev)
{
	int i,a,n, port = dev->port;

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

	switch( (dev->curvol+(1<<11)) >> 12 )
	{
	case 0: case 1: n = 0x21; break;
	case 2: n = 0x84; break;
	case 3: n = 0x90; break;
	case 4: n = 0x104; break;
	case 5: n = 0x110; break;
	case 6: n = 0x204; break;
	case 7: n = 0x210; break;
	case 8: n = 0x402; break;
	case 9: n = 0x404; break;
	default:
	case 10: n = 0x408; break;
	case 11: n = 0x410; break;
	case 12: n = 0x801; break;
	case 13: n = 0x802; break;
	case 14: n = 0x804; break;
	case 15: n = 0x808; break;
	case 16: n = 0x810; break;
	}
	for(i=12;--i>=0;)
	{
		a = ((n >> i) & 1) << 6; /* if (a=0) a= 0; else a= 0x40; */
		outb(a|4, port);
		wait(4,port);
		outb(a|0x24, port);
		wait(4,port);
		outb(a|4, port);
		wait(4,port);
	}
	for(i=6;--i>=0;)
	{
		a = ((0x18 >> i) & 1) << 6;
		outb(a|4, port);
		wait(4,port);
		outb(a|0x24, port);
		wait(4,port);
		outb(a|4, port);
		wait(4,port);
	}
	wait(4,port);
	outb(0x14, port);

	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));
	sprintf(v->bus_info, "ISA");
	v->version = RADIO_VERSION;
	v->capabilities = V4L2_CAP_TUNER;
	return 0;
}

static int vidioc_g_tuner(struct file *file, void *priv,
					struct v4l2_tuner *v)
{
	int mult;
	struct video_device *dev = video_devdata(file);
	struct fmr2_device *fmr2 = dev->priv;

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

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

	mult = (fmr2->flags & V4L2_TUNER_CAP_LOW) ? 1 : 1000;
	v->rangelow = RSF16_MINFREQ/mult;
	v->rangehigh = RSF16_MAXFREQ/mult;
	v->rxsubchans = V4L2_TUNER_SUB_MONO | V4L2_TUNER_MODE_STEREO;
	v->capability = fmr2->flags&V4L2_TUNER_CAP_LOW;
	v->audmode = fmr2->stereo ? V4L2_TUNER_MODE_STEREO:
				V4L2_TUNER_MODE_MONO;
	mutex_lock(&lock);
	v->signal = fmr2_getsigstr(fmr2);
	mutex_unlock(&lock);
	return 0;
}

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

static int vidioc_s_frequency(struct file *file, void *priv,
					struct v4l2_frequency *f)
{
	struct video_device *dev = video_devdata(file);
	struct fmr2_device *fmr2 = dev->priv;

	if (!(fmr2->flags & V4L2_TUNER_CAP_LOW))
		f->frequency *= 1000;
	if (f->frequency < RSF16_MINFREQ ||
			f->frequency > RSF16_MAXFREQ )
		return -EINVAL;
	/*rounding in steps of 200 to match th freq
	that will be used */
	fmr2->curfreq = (f->frequency/200)*200;

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

static int vidioc_g_frequency(struct file *file, void *priv,
					struct v4l2_frequency *f)
{
	struct video_device *dev = video_devdata(file);
	struct fmr2_device *fmr2 = dev->priv;

	f->type = V4L2_TUNER_RADIO;
	f->frequency = fmr2->curfreq;
	if (!(fmr2->flags & V4L2_TUNER_CAP_LOW))
		f->frequency /= 1000;
	return 0;
}

static int vidioc_queryctrl(struct file *file, void *priv,
					struct v4l2_queryctrl *qc)
{
	int i;
	struct video_device *dev = video_devdata(file);
	struct fmr2_device *fmr2 = dev->priv;

	for (i = 0; i < ARRAY_SIZE(radio_qctrl); i++) {
		if ((fmr2->card_type != 11)
				&& V4L2_CID_AUDIO_VOLUME)
			radio_qctrl[i].step = 65535;
		if (qc->id && qc->id == radio_qctrl[i].id) {
			memcpy(qc, &(radio_qctrl[i]),
						sizeof(*qc));
			return 0;
		}
	}
	return -EINVAL;
}

static int vidioc_g_ctrl(struct file *file, void *priv,
					struct v4l2_control *ctrl)
{
	struct video_device *dev = video_devdata(file);
	struct fmr2_device *fmr2 = dev->priv;

	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 video_device *dev = video_devdata(file);
	struct fmr2_device *fmr2 = dev->priv;

	switch (ctrl->id) {
	case V4L2_CID_AUDIO_MUTE:
		fmr2->mute = ctrl->value;
		if (fmr2->card_type != 11) {
			if (!fmr2->mute)
				fmr2->curvol = 65535;
			else
				fmr2->curvol = 0;
		}
		break;
	case V4L2_CID_AUDIO_VOLUME:
		fmr2->curvol = ctrl->value;
		if (fmr2->card_type != 11) {
			if (fmr2->curvol) {
				fmr2->curvol = 65535;
				fmr2->mute = 0;
			} else {
				fmr2->curvol = 0;
				fmr2->mute = 1;
			}
		}
		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(&lock);
	if (fmr2->curvol && !fmr2->mute) {
		fmr2_setvolume(fmr2);
		fmr2_setfreq(fmr2);
	} else
		fmr2_mute(fmr2->port);
	mutex_unlock(&lock);
	return 0;
}

static int vidioc_g_audio(struct file *file, void *priv,
					struct v4l2_audio *a)
{
	if (a->index > 1)
		return -EINVAL;

	strcpy(a->name, "Radio");
	a->capability = V4L2_AUDCAP_STEREO;
	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)
{
	if (i != 0)
		return -EINVAL;
	return 0;
}

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

static struct fmr2_device fmr2_unit;

static const struct file_operations fmr2_fops = {
	.owner          = THIS_MODULE,
	.open           = video_exclusive_open,
	.release        = video_exclusive_release,
	.ioctl          = video_ioctl2,
	.compat_ioctl	= v4l_compat_ioctl32,
	.llseek         = no_llseek,
};

static struct video_device fmr2_radio=
{
	.owner		= THIS_MODULE,
	.name		= "SF16FMR2 radio",
	. type		= VID_TYPE_TUNER,
	.fops		= &fmr2_fops,
	.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)
{
	fmr2_unit.port = io;
	fmr2_unit.curvol = 0;
	fmr2_unit.mute = 0;
	fmr2_unit.curfreq = 0;
	fmr2_unit.stereo = 1;
	fmr2_unit.flags = V4L2_TUNER_CAP_LOW;
	fmr2_unit.card_type = 0;
	fmr2_radio.priv = &fmr2_unit;

	mutex_init(&lock);

	if (request_region(io, 2, "sf16fmr2"))
	{
		printk(KERN_ERR "fmr2: port 0x%x already in use\n", io);
		return -EBUSY;
	}

	if(video_register_device(&fmr2_radio, VFL_TYPE_RADIO, radio_nr)==-1)
	{
		release_region(io, 2);
		return -EINVAL;
	}

	printk(KERN_INFO "SF16FMR2 radio card driver at 0x%x.\n", io);
	/* mute card - prevents noisy bootups */
	mutex_lock(&lock);
	fmr2_mute(io);
	fmr2_product_info(&fmr2_unit);
	mutex_unlock(&lock);
	debug_print((KERN_DEBUG "card_type %d\n", fmr2_unit.card_type));
	return 0;
}

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

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);

static void __exit fmr2_cleanup_module(void)
{
	video_unregister_device(&fmr2_radio);
	release_region(io,2);
}

module_init(fmr2_init);
module_exit(fmr2_cleanup_module);

#ifndef MODULE

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

__setup("sf16fmr2=", fmr2_setup_io);

#endif