summaryrefslogtreecommitdiffstats
path: root/drivers/media/radio/radio-trust.c
blob: 6f9ecc359356c1cc20f93210d5558f072ca66c76 (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
/* radio-trust.c - Trust FM Radio card driver for Linux 2.2
 * by Eric Lammerts <eric@scintilla.utwente.nl>
 *
 * Based on radio-aztech.c. Original notes:
 *
 * Adapted to support the Video for Linux API by
 * Russell Kroll <rkroll@exploits.org>.  Based on original tuner code by:
 *
 * Quay Ly
 * Donald Song
 * Jason Lewis      (jlewis@twilight.vtc.vsc.edu)
 * Scott McGrath    (smcgrath@twilight.vtc.vsc.edu)
 * William McGrath  (wmcgrath@twilight.vtc.vsc.edu)
 *
 * Converted to V4L2 API by Mauro Carvalho Chehab <mchehab@infradead.org>
 */

#include <stdarg.h>
#include <linux/module.h>
#include <linux/init.h>
#include <linux/ioport.h>
#include <linux/version.h>      /* for KERNEL_VERSION MACRO     */
#include <linux/videodev2.h>
#include <linux/io.h>
#include <media/v4l2-device.h>
#include <media/v4l2-ioctl.h>

MODULE_AUTHOR("Eric Lammerts, Russell Kroll, Quay Lu, Donald Song, Jason Lewis, Scott McGrath, William McGrath");
MODULE_DESCRIPTION("A driver for the Trust FM Radio card.");
MODULE_LICENSE("GPL");

/* acceptable ports: 0x350 (JP3 shorted), 0x358 (JP3 open) */

#ifndef CONFIG_RADIO_TRUST_PORT
#define CONFIG_RADIO_TRUST_PORT -1
#endif

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

module_param(io, int, 0);
MODULE_PARM_DESC(io, "I/O address of the Trust FM Radio card (0x350 or 0x358)");
module_param(radio_nr, int, 0);

#define RADIO_VERSION KERNEL_VERSION(0, 0, 2)

struct trust {
	struct v4l2_device v4l2_dev;
	struct video_device vdev;
	int io;
	int ioval;
	__u16 curvol;
	__u16 curbass;
	__u16 curtreble;
	int muted;
	unsigned long curfreq;
	int curstereo;
	int curmute;
	struct mutex lock;
};

static struct trust trust_card;

/* i2c addresses */
#define TDA7318_ADDR 0x88
#define TSA6060T_ADDR 0xc4

#define TR_DELAY do { inb(tr->io); inb(tr->io); inb(tr->io); } while (0)
#define TR_SET_SCL outb(tr->ioval |= 2, tr->io)
#define TR_CLR_SCL outb(tr->ioval &= 0xfd, tr->io)
#define TR_SET_SDA outb(tr->ioval |= 1, tr->io)
#define TR_CLR_SDA outb(tr->ioval &= 0xfe, tr->io)

static void write_i2c(struct trust *tr, int n, ...)
{
	unsigned char val, mask;
	va_list args;

	va_start(args, n);

	/* start condition */
	TR_SET_SDA;
	TR_SET_SCL;
	TR_DELAY;
	TR_CLR_SDA;
	TR_CLR_SCL;
	TR_DELAY;

	for(; n; n--) {
		val = va_arg(args, unsigned);
		for(mask = 0x80; mask; mask >>= 1) {
			if(val & mask)
				TR_SET_SDA;
			else
				TR_CLR_SDA;
			TR_SET_SCL;
			TR_DELAY;
			TR_CLR_SCL;
			TR_DELAY;
		}
		/* acknowledge bit */
		TR_SET_SDA;
		TR_SET_SCL;
		TR_DELAY;
		TR_CLR_SCL;
		TR_DELAY;
	}

	/* stop condition */
	TR_CLR_SDA;
	TR_DELAY;
	TR_SET_SCL;
	TR_DELAY;
	TR_SET_SDA;
	TR_DELAY;

	va_end(args);
}

static void tr_setvol(struct trust *tr, __u16 vol)
{
	mutex_lock(&tr->lock);
	tr->curvol = vol / 2048;
	write_i2c(tr, 2, TDA7318_ADDR, tr->curvol ^ 0x1f);
	mutex_unlock(&tr->lock);
}

static int basstreble2chip[15] = {
	0, 1, 2, 3, 4, 5, 6, 7, 14, 13, 12, 11, 10, 9, 8
};

static void tr_setbass(struct trust *tr, __u16 bass)
{
	mutex_lock(&tr->lock);
	tr->curbass = bass / 4370;
	write_i2c(tr, 2, TDA7318_ADDR, 0x60 | basstreble2chip[tr->curbass]);
	mutex_unlock(&tr->lock);
}

static void tr_settreble(struct trust *tr, __u16 treble)
{
	mutex_lock(&tr->lock);
	tr->curtreble = treble / 4370;
	write_i2c(tr, 2, TDA7318_ADDR, 0x70 | basstreble2chip[tr->curtreble]);
	mutex_unlock(&tr->lock);
}

static void tr_setstereo(struct trust *tr, int stereo)
{
	mutex_lock(&tr->lock);
	tr->curstereo = !!stereo;
	tr->ioval = (tr->ioval & 0xfb) | (!tr->curstereo << 2);
	outb(tr->ioval, tr->io);
	mutex_unlock(&tr->lock);
}

static void tr_setmute(struct trust *tr, int mute)
{
	mutex_lock(&tr->lock);
	tr->curmute = !!mute;
	tr->ioval = (tr->ioval & 0xf7) | (tr->curmute << 3);
	outb(tr->ioval, tr->io);
	mutex_unlock(&tr->lock);
}

static int tr_getsigstr(struct trust *tr)
{
	int i, v;

	mutex_lock(&tr->lock);
	for (i = 0, v = 0; i < 100; i++)
		v |= inb(tr->io);
	mutex_unlock(&tr->lock);
	return (v & 1) ? 0 : 0xffff;
}

static int tr_getstereo(struct trust *tr)
{
	/* don't know how to determine it, just return the setting */
	return tr->curstereo;
}

static void tr_setfreq(struct trust *tr, unsigned long f)
{
	mutex_lock(&tr->lock);
	tr->curfreq = f;
	f /= 160;	/* Convert to 10 kHz units	*/
	f += 1070;	/* Add 10.7 MHz IF		*/
	write_i2c(tr, 5, TSA6060T_ADDR, (f << 1) | 1, f >> 7, 0x60 | ((f >> 15) & 1), 0);
	mutex_unlock(&tr->lock);
}

static int vidioc_querycap(struct file *file, void *priv,
				struct v4l2_capability *v)
{
	strlcpy(v->driver, "radio-trust", sizeof(v->driver));
	strlcpy(v->card, "Trust FM 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 trust *tr = video_drvdata(file);

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

	strlcpy(v->name, "FM", sizeof(v->name));
	v->type = V4L2_TUNER_RADIO;
	v->rangelow = 87.5 * 16000;
	v->rangehigh = 108 * 16000;
	v->rxsubchans = V4L2_TUNER_SUB_MONO | V4L2_TUNER_SUB_STEREO;
	v->capability = V4L2_TUNER_CAP_LOW;
	if (tr_getstereo(tr))
		v->audmode = V4L2_TUNER_MODE_STEREO;
	else
		v->audmode = V4L2_TUNER_MODE_MONO;
	v->signal = tr_getsigstr(tr);
	return 0;
}

static int vidioc_s_tuner(struct file *file, void *priv,
				struct v4l2_tuner *v)
{
	struct trust *tr = video_drvdata(file);

	if (v->index)
		return -EINVAL;
	tr_setstereo(tr, v->audmode == V4L2_TUNER_MODE_STEREO);
	return 0;
}

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

	tr_setfreq(tr, f->frequency);
	return 0;
}

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

	f->type = V4L2_TUNER_RADIO;
	f->frequency = tr->curfreq;
	return 0;
}

static int vidioc_queryctrl(struct file *file, void *priv,
				struct v4l2_queryctrl *qc)
{
	switch (qc->id) {
	case V4L2_CID_AUDIO_MUTE:
		return v4l2_ctrl_query_fill(qc, 0, 1, 1, 1);
	case V4L2_CID_AUDIO_VOLUME:
		return v4l2_ctrl_query_fill(qc, 0, 65535, 2048, 65535);
	case V4L2_CID_AUDIO_BASS:
	case V4L2_CID_AUDIO_TREBLE:
		return v4l2_ctrl_query_fill(qc, 0, 65535, 4370, 32768);
	}
	return -EINVAL;
}

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

	switch (ctrl->id) {
	case V4L2_CID_AUDIO_MUTE:
		ctrl->value = tr->curmute;
		return 0;
	case V4L2_CID_AUDIO_VOLUME:
		ctrl->value = tr->curvol * 2048;
		return 0;
	case V4L2_CID_AUDIO_BASS:
		ctrl->value = tr->curbass * 4370;
		return 0;
	case V4L2_CID_AUDIO_TREBLE:
		ctrl->value = tr->curtreble * 4370;
		return 0;
	}
	return -EINVAL;
}

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

	switch (ctrl->id) {
	case V4L2_CID_AUDIO_MUTE:
		tr_setmute(tr, ctrl->value);
		return 0;
	case V4L2_CID_AUDIO_VOLUME:
		tr_setvol(tr, ctrl->value);
		return 0;
	case V4L2_CID_AUDIO_BASS:
		tr_setbass(tr, ctrl->value);
		return 0;
	case V4L2_CID_AUDIO_TREBLE:
		tr_settreble(tr, 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 trust_fops = {
	.owner		= THIS_MODULE,
	.ioctl		= video_ioctl2,
};

static const struct v4l2_ioctl_ops trust_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 trust_init(void)
{
	struct trust *tr = &trust_card;
	struct v4l2_device *v4l2_dev = &tr->v4l2_dev;
	int res;

	strlcpy(v4l2_dev->name, "trust", sizeof(v4l2_dev->name));
	tr->io = io;
	tr->ioval = 0xf;
	mutex_init(&tr->lock);

	if (tr->io == -1) {
		v4l2_err(v4l2_dev, "You must set an I/O address with io=0x0x350 or 0x358\n");
		return -EINVAL;
	}
	if (!request_region(tr->io, 2, "Trust FM Radio")) {
		v4l2_err(v4l2_dev, "port 0x%x already in use\n", tr->io);
		return -EBUSY;
	}

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

	strlcpy(tr->vdev.name, v4l2_dev->name, sizeof(tr->vdev.name));
	tr->vdev.v4l2_dev = v4l2_dev;
	tr->vdev.fops = &trust_fops;
	tr->vdev.ioctl_ops = &trust_ioctl_ops;
	tr->vdev.release = video_device_release_empty;
	video_set_drvdata(&tr->vdev, tr);

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

	v4l2_info(v4l2_dev, "Trust FM Radio card driver v1.0.\n");

	write_i2c(tr, 2, TDA7318_ADDR, 0x80);	/* speaker att. LF = 0 dB */
	write_i2c(tr, 2, TDA7318_ADDR, 0xa0);	/* speaker att. RF = 0 dB */
	write_i2c(tr, 2, TDA7318_ADDR, 0xc0);	/* speaker att. LR = 0 dB */
	write_i2c(tr, 2, TDA7318_ADDR, 0xe0);	/* speaker att. RR = 0 dB */
	write_i2c(tr, 2, TDA7318_ADDR, 0x40);	/* stereo 1 input, gain = 18.75 dB */

	tr_setvol(tr, 0xffff);
	tr_setbass(tr, 0x8000);
	tr_settreble(tr, 0x8000);
	tr_setstereo(tr, 1);

	/* mute card - prevents noisy bootups */
	tr_setmute(tr, 1);

	return 0;
}

static void __exit cleanup_trust_module(void)
{
	struct trust *tr = &trust_card;

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

module_init(trust_init);
module_exit(cleanup_trust_module);
OpenPOWER on IntegriCloud