aboutsummaryrefslogtreecommitdiff
path: root/drivers/media/radio/radio-terratec.c
blob: a32663917059c1cd4734247452c33444c02ad5d2 (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
/* Terratec ActiveRadio ISA Standalone card driver for Linux radio support
 * (c) 1999 R. Offermanns (rolf@offermanns.de)
 * based on the aimslab radio driver from M. Kirkwood
 * many thanks to Michael Becker and Friedhelm Birth (from TerraTec)
 *
 *
 * History:
 * 1999-05-21	First preview release
 *
 *  Notes on the hardware:
 *  There are two "main" chips on the card:
 *  - Philips OM5610 (http://www-us.semiconductors.philips.com/acrobat/datasheets/OM5610_2.pdf)
 *  - Philips SAA6588 (http://www-us.semiconductors.philips.com/acrobat/datasheets/SAA6588_1.pdf)
 *  (you can get the datasheet at the above links)
 *
 *  Frequency control is done digitally -- ie out(port,encodefreq(95.8));
 *  Volume Control is done digitally
 *
 *  there is a I2C controlled RDS decoder (SAA6588)  onboard, which i would like to support someday
 *  (as soon i have understand how to get started :)
 *  If you can help me out with that, please contact me!!
 *
 *
 * 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/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("R.OFFERMANNS & others");
MODULE_DESCRIPTION("A driver for the TerraTec ActiveRadio Standalone radio card.");
MODULE_LICENSE("GPL");

#ifndef CONFIG_RADIO_TERRATEC_PORT
#define CONFIG_RADIO_TERRATEC_PORT 0x590
#endif

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

module_param(io, int, 0);
MODULE_PARM_DESC(io, "I/O address of the TerraTec ActiveRadio card (0x590 or 0x591)");
module_param(radio_nr, int, 0);

#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       = 0xff,
		.step          = 1,
		.default_value = 0xff,
		.type          = V4L2_CTRL_TYPE_INTEGER,
	}
};

#define WRT_DIS 	0x00
#define CLK_OFF		0x00
#define IIC_DATA	0x01
#define IIC_CLK		0x02
#define DATA		0x04
#define CLK_ON 		0x08
#define WRT_EN		0x10

struct terratec
{
	struct v4l2_device v4l2_dev;
	struct video_device vdev;
	int io;
	int curvol;
	unsigned long curfreq;
	int muted;
	struct mutex lock;
};

static struct terratec terratec_card;

/* local things */

static void tt_write_vol(struct terratec *tt, int volume)
{
	int i;

	volume = volume + (volume * 32); /* change both channels */
	mutex_lock(&tt->lock);
	for (i = 0; i < 8; i++) {
		if (volume & (0x80 >> i))
			outb(0x80, tt->io + 1);
		else
			outb(0x00, tt->io + 1);
	}
	mutex_unlock(&tt->lock);
}



static void tt_mute(struct terratec *tt)
{
	tt->muted = 1;
	tt_write_vol(tt, 0);
}

static int tt_setvol(struct terratec *tt, int vol)
{
	if (vol == tt->curvol) {	/* requested volume = current */
		if (tt->muted) {	/* user is unmuting the card  */
			tt->muted = 0;
			tt_write_vol(tt, vol);	/* enable card */
		}
		return 0;
	}

	if (vol == 0) {			/* volume = 0 means mute the card */
		tt_write_vol(tt, 0);	/* "turn off card" by setting vol to 0 */
		tt->curvol = vol;	/* track the volume state!	*/
		return 0;
	}

	tt->muted = 0;
	tt_write_vol(tt, vol);
	tt->curvol = vol;
	return 0;
}


/* this is the worst part in this driver */
/* many more or less strange things are going on here, but hey, it works :) */

static int tt_setfreq(struct terratec *tt, unsigned long freq1)
{
	int freq;
	int i;
	int p;
	int  temp;
	long rest;
	unsigned char buffer[25];		/* we have to bit shift 25 registers */

	mutex_lock(&tt->lock);

	tt->curfreq = freq1;

	freq = freq1 / 160;			/* convert the freq. to a nice to handle value */
	memset(buffer, 0, sizeof(buffer));

	rest = freq * 10 + 10700;	/* I once had understood what is going on here */
					/* maybe some wise guy (friedhelm?) can comment this stuff */
	i = 13;
	p = 10;
	temp = 102400;
	while (rest != 0) {
		if (rest % temp  == rest)
			buffer[i] = 0;
		else {
			buffer[i] = 1;
			rest = rest - temp;
		}
		i--;
		p--;
		temp = temp / 2;
	}

	for (i = 24; i > -1; i--) {	/* bit shift the values to the radiocard */
		if (buffer[i] == 1) {
			outb(WRT_EN | DATA, tt->io);
			outb(WRT_EN | DATA | CLK_ON, tt->io);
			outb(WRT_EN | DATA, tt->io);
		} else {
			outb(WRT_EN | 0x00, tt->io);
			outb(WRT_EN | 0x00 | CLK_ON, tt->io);
		}
	}
	outb(0x00, tt->io);

	mutex_unlock(&tt->lock);

	return 0;
}

static int tt_getsigstr(struct terratec *tt)
{
	if (inb(tt->io) & 2)	/* bit set = no signal present	*/
		return 0;
	return 1;		/* signal present		*/
}

static int vidioc_querycap(struct file *file, void *priv,
					struct v4l2_capability *v)
{
	strlcpy(v->driver, "radio-terratec", sizeof(v->driver));
	strlcpy(v->card, "ActiveRadio", 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 terratec *tt = video_drvdata(file);

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

	strlcpy(v->name, "FM", sizeof(v->name));
	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 * tt_getsigstr(tt);
	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 terratec *tt = video_drvdata(file);

	if (f->tuner != 0 || f->type != V4L2_TUNER_RADIO)
		return -EINVAL;
	tt_setfreq(tt, f->frequency);
	return 0;
}

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

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

static int vidioc_queryctrl(struct file *file, void *priv,
					struct v4l2_queryctrl *qc)
{
	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;
}

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

	switch (ctrl->id) {
	case V4L2_CID_AUDIO_MUTE:
		if (tt->muted)
			ctrl->value = 1;
		else
			ctrl->value = 0;
		return 0;
	case V4L2_CID_AUDIO_VOLUME:
		ctrl->value = tt->curvol * 6554;
		return 0;
	}
	return -EINVAL;
}

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

	switch (ctrl->id) {
	case V4L2_CID_AUDIO_MUTE:
		if (ctrl->value)
			tt_mute(tt);
		else
			tt_setvol(tt,tt->curvol);
		return 0;
	case V4L2_CID_AUDIO_VOLUME:
		tt_setvol(tt,ctrl->value);
		return 0;
	}
	return -EINVAL;
}

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 terratec_fops = {
	.owner		= THIS_MODULE,
	.unlocked_ioctl	= video_ioctl2,
};

static const struct v4l2_ioctl_ops terratec_ioctl_ops = {
	.vidioc_querycap    = vidioc_querycap,
	.vidioc_g_tuner     = vidioc_g_tuner,
	.vidioc_s_tuner     = vidioc_s_tuner,
	.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,
	.vidioc_g_audio     = vidioc_g_audio,
	.vidioc_s_audio     = vidioc_s_audio,
	.vidioc_g_input     = vidioc_g_input,
	.vidioc_s_input     = vidioc_s_input,
};

static int __init terratec_init(void)
{
	struct terratec *tt = &terratec_card;
	struct v4l2_device *v4l2_dev = &tt->v4l2_dev;
	int res;

	strlcpy(v4l2_dev->name, "terratec", sizeof(v4l2_dev->name));
	tt->io = io;
	if (tt->io == -1) {
		v4l2_err(v4l2_dev, "you must set an I/O address with io=0x590 or 0x591\n");
		return -EINVAL;
	}
	if (!request_region(tt->io, 2, "terratec")) {
		v4l2_err(v4l2_dev, "port 0x%x already in use\n", io);
		return -EBUSY;
	}

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

	strlcpy(tt->vdev.name, v4l2_dev->name, sizeof(tt->vdev.name));
	tt->vdev.v4l2_dev = v4l2_dev;
	tt->vdev.fops = &terratec_fops;
	tt->vdev.ioctl_ops = &terratec_ioctl_ops;
	tt->vdev.release = video_device_release_empty;
	video_set_drvdata(&tt->vdev, tt);

	mutex_init(&tt->lock);

	/* mute card - prevents noisy bootups */
	tt_write_vol(tt, 0);

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

	v4l2_info(v4l2_dev, "TERRATEC ActivRadio Standalone card driver.\n");
	return 0;
}

static void __exit terratec_exit(void)
{
	struct terratec *tt = &terratec_card;
	struct v4l2_device *v4l2_dev = &tt->v4l2_dev;

	video_unregister_device(&tt->vdev);
	v4l2_device_unregister(&tt->v4l2_dev);
	release_region(tt->io, 2);
	v4l2_info(v4l2_dev, "TERRATEC ActivRadio Standalone card driver unloaded.\n");
}

module_init(terratec_init);
module_exit(terratec_exit);