Bootlin logo

Elixir Cross Referencer

  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
/* zoltrix radio plus driver for Linux radio support
 * (c) 1998 C. van Schaik <carl@leg.uct.ac.za>
 *
 * BUGS
 *  Due to the inconsistency in reading from the signal flags
 *  it is difficult to get an accurate tuned signal.
 *
 *  It seems that the card is not linear to 0 volume. It cuts off
 *  at a low volume, and it is not possible (at least I have not found)
 *  to get fine volume control over the low volume range.
 *
 *  Some code derived from code by Romolo Manfredini
 *				   romolo@bicnet.it
 *
 * 1999-05-06 - (C. van Schaik)
 *	      - Make signal strength and stereo scans
 *		kinder to cpu while in delay
 * 1999-01-05 - (C. van Schaik)
 *	      - Changed tuning to 1/160Mhz accuracy
 *	      - Added stereo support
 *		(card defaults to stereo)
 *		(can explicitly force mono on the card)
 *		(can detect if station is in stereo)
 *	      - Added unmute function
 *	      - Reworked ioctl functions
 * 2002-07-15 - Fix Stereo typo
 *
 * 2006-07-24 - 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, msleep                 */
#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/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          = 4096,
		.default_value = 0xff,
		.type          = V4L2_CTRL_TYPE_INTEGER,
	}
};

#ifndef CONFIG_RADIO_ZOLTRIX_PORT
#define CONFIG_RADIO_ZOLTRIX_PORT -1
#endif

static int io = CONFIG_RADIO_ZOLTRIX_PORT;
static int radio_nr = -1;

struct zol_device {
	int port;
	int curvol;
	unsigned long curfreq;
	int muted;
	unsigned int stereo;
	struct mutex lock;
};

static int zol_setvol(struct zol_device *dev, int vol)
{
	dev->curvol = vol;
	if (dev->muted)
		return 0;

	mutex_lock(&dev->lock);
	if (vol == 0) {
		outb(0, io);
		outb(0, io);
		inb(io + 3);    /* Zoltrix needs to be read to confirm */
		mutex_unlock(&dev->lock);
		return 0;
	}

	outb(dev->curvol-1, io);
	msleep(10);
	inb(io + 2);
	mutex_unlock(&dev->lock);
	return 0;
}

static void zol_mute(struct zol_device *dev)
{
	dev->muted = 1;
	mutex_lock(&dev->lock);
	outb(0, io);
	outb(0, io);
	inb(io + 3);            /* Zoltrix needs to be read to confirm */
	mutex_unlock(&dev->lock);
}

static void zol_unmute(struct zol_device *dev)
{
	dev->muted = 0;
	zol_setvol(dev, dev->curvol);
}

static int zol_setfreq(struct zol_device *dev, unsigned long freq)
{
	/* tunes the radio to the desired frequency */
	unsigned long long bitmask, f, m;
	unsigned int stereo = dev->stereo;
	int i;

	if (freq == 0)
		return 1;
	m = (freq / 160 - 8800) * 2;
	f = (unsigned long long) m + 0x4d1c;

	bitmask = 0xc480402c10080000ull;
	i = 45;

	mutex_lock(&dev->lock);

	outb(0, io);
	outb(0, io);
	inb(io + 3);            /* Zoltrix needs to be read to confirm */

	outb(0x40, io);
	outb(0xc0, io);

	bitmask = (bitmask ^ ((f & 0xff) << 47) ^ ((f & 0xff00) << 30) ^ ( stereo << 31));
	while (i--) {
		if ((bitmask & 0x8000000000000000ull) != 0) {
			outb(0x80, io);
			udelay(50);
			outb(0x00, io);
			udelay(50);
			outb(0x80, io);
			udelay(50);
		} else {
			outb(0xc0, io);
			udelay(50);
			outb(0x40, io);
			udelay(50);
			outb(0xc0, io);
			udelay(50);
		}
		bitmask *= 2;
	}
	/* termination sequence */
	outb(0x80, io);
	outb(0xc0, io);
	outb(0x40, io);
	udelay(1000);
	inb(io+2);

	udelay(1000);

	if (dev->muted)
	{
		outb(0, io);
		outb(0, io);
		inb(io + 3);
		udelay(1000);
	}

	mutex_unlock(&dev->lock);

	if(!dev->muted)
	{
		zol_setvol(dev, dev->curvol);
	}
	return 0;
}

/* Get signal strength */

static int zol_getsigstr(struct zol_device *dev)
{
	int a, b;

	mutex_lock(&dev->lock);
	outb(0x00, io);         /* This stuff I found to do nothing */
	outb(dev->curvol, io);
	msleep(20);

	a = inb(io);
	msleep(10);
	b = inb(io);

	mutex_unlock(&dev->lock);

	if (a != b)
		return (0);

	if ((a == 0xcf) || (a == 0xdf)  /* I found this out by playing */
		|| (a == 0xef))       /* with a binary scanner on the card io */
		return (1);
	return (0);
}

static int zol_is_stereo (struct zol_device *dev)
{
	int x1, x2;

	mutex_lock(&dev->lock);

	outb(0x00, io);
	outb(dev->curvol, io);
	msleep(20);

	x1 = inb(io);
	msleep(10);
	x2 = inb(io);

	mutex_unlock(&dev->lock);

	if ((x1 == x2) && (x1 == 0xcf))
		return 1;
	return 0;
}

static int zol_do_ioctl(struct inode *inode, struct file *file,
			unsigned int cmd, void *arg)
{
	struct video_device *dev = video_devdata(file);
	struct zol_device *zol = dev->priv;

	switch (cmd) {
		case VIDIOC_QUERYCAP:
		{
			struct v4l2_capability *v = arg;
			memset(v,0,sizeof(*v));
			strlcpy(v->driver, "radio-zoltrix", sizeof (v->driver));
			strlcpy(v->card, "Zoltrix Radio", 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=(88*16000);
			v->rangehigh=(108*16000);
			v->rxsubchans =V4L2_TUNER_SUB_MONO|V4L2_TUNER_SUB_STEREO;
			v->capability=V4L2_TUNER_CAP_LOW;
			if(zol_is_stereo(zol))
				v->audmode = V4L2_TUNER_MODE_STEREO;
			else
				v->audmode = V4L2_TUNER_MODE_MONO;
			v->signal=0xFFFF*zol_getsigstr(zol);

			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;

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

			f->type = V4L2_TUNER_RADIO;
			f->frequency = zol->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=zol->muted;
					return (0);
				case V4L2_CID_AUDIO_VOLUME:
					ctrl->value=zol->curvol * 4096;
					return (0);
			}
			return -EINVAL;
		}
		case VIDIOC_S_CTRL:
		{
			struct v4l2_control *ctrl= arg;

			switch (ctrl->id) {
				case V4L2_CID_AUDIO_MUTE:
					if (ctrl->value) {
						zol_mute(zol);
					} else {
						zol_unmute(zol);
						zol_setvol(zol,zol->curvol);
					}
					return (0);
				case V4L2_CID_AUDIO_VOLUME:
					zol_setvol(zol,ctrl->value/4096);
					return (0);
			}
			zol->stereo = 1;
			zol_setfreq(zol, zol->curfreq);
#if 0
/* FIXME: Implement stereo/mono switch on V4L2 */
			if (v->mode & VIDEO_SOUND_STEREO) {
				zol->stereo = 1;
				zol_setfreq(zol, zol->curfreq);
			}
			if (v->mode & VIDEO_SOUND_MONO) {
				zol->stereo = 0;
				zol_setfreq(zol, zol->curfreq);
			}
#endif
			return -EINVAL;
		}

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

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

static struct zol_device zoltrix_unit;

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

static struct video_device zoltrix_radio =
{
	.owner		= THIS_MODULE,
	.name		= "Zoltrix Radio Plus",
	.type		= VID_TYPE_TUNER,
	.hardware	= 0,
	.fops           = &zoltrix_fops,
};

static int __init zoltrix_init(void)
{
	if (io == -1) {
		printk(KERN_ERR "You must set an I/O address with io=0x???\n");
		return -EINVAL;
	}
	if ((io != 0x20c) && (io != 0x30c)) {
		printk(KERN_ERR "zoltrix: invalid port, try 0x20c or 0x30c\n");
		return -ENXIO;
	}

	zoltrix_radio.priv = &zoltrix_unit;
	if (!request_region(io, 2, "zoltrix")) {
		printk(KERN_ERR "zoltrix: port 0x%x already in use\n", io);
		return -EBUSY;
	}

	if (video_register_device(&zoltrix_radio, VFL_TYPE_RADIO, radio_nr) == -1)
	{
		release_region(io, 2);
		return -EINVAL;
	}
	printk(KERN_INFO "Zoltrix Radio Plus card driver.\n");

	mutex_init(&zoltrix_unit.lock);

	/* mute card - prevents noisy bootups */

	/* this ensures that the volume is all the way down  */

	outb(0, io);
	outb(0, io);
	msleep(20);
	inb(io + 3);

	zoltrix_unit.curvol = 0;
	zoltrix_unit.stereo = 1;

	return 0;
}

MODULE_AUTHOR("C.van Schaik");
MODULE_DESCRIPTION("A driver for the Zoltrix Radio Plus.");
MODULE_LICENSE("GPL");

module_param(io, int, 0);
MODULE_PARM_DESC(io, "I/O address of the Zoltrix Radio Plus (0x20c or 0x30c)");
module_param(radio_nr, int, 0);

static void __exit zoltrix_cleanup_module(void)
{
	video_unregister_device(&zoltrix_radio);
	release_region(io, 2);
}

module_init(zoltrix_init);
module_exit(zoltrix_cleanup_module);