aboutsummaryrefslogtreecommitdiff
path: root/drivers/media/radio/radio-trust.c
blob: 5a099a50d4d060e1af66e7a31711d7b3182fb2c8 (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
/* 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)
 *
 * The basis for this code may be found at http://bigbang.vtc.vsc.edu/fmradio/
 */

#include <stdarg.h>
#include <linux/module.h>
#include <linux/init.h>
#include <linux/ioport.h>
#include <asm/io.h>
#include <asm/uaccess.h>
#include <linux/videodev.h>
#include <linux/config.h>	/* CONFIG_RADIO_TRUST_PORT 	*/

/* 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;
static int ioval = 0xf;
static __u16 curvol;
static __u16 curbass;
static __u16 curtreble;
static unsigned long curfreq;
static int curstereo;
static int curmute;

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

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

static void write_i2c(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(__u16 vol)
{
	curvol = vol / 2048;
	write_i2c(2, TDA7318_ADDR, curvol ^ 0x1f);
}

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

static void tr_setbass(__u16 bass)
{
	curbass = bass / 4370;
	write_i2c(2, TDA7318_ADDR, 0x60 | basstreble2chip[curbass]);
}

static void tr_settreble(__u16 treble)
{
	curtreble = treble / 4370;
	write_i2c(2, TDA7318_ADDR, 0x70 | basstreble2chip[curtreble]);
}

static void tr_setstereo(int stereo)
{
	curstereo = !!stereo;
	ioval = (ioval & 0xfb) | (!curstereo << 2);
	outb(ioval, io);
}

static void tr_setmute(int mute)
{
	curmute = !!mute;
	ioval = (ioval & 0xf7) | (curmute << 3);
	outb(ioval, io);
}

static int tr_getsigstr(void)
{
	int i, v;
	
	for(i = 0, v = 0; i < 100; i++) v |= inb(io);
	return (v & 1)? 0 : 0xffff;
}

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

static void tr_setfreq(unsigned long f)
{
	f /= 160;	/* Convert to 10 kHz units	*/
	f += 1070;	/* Add 10.7 MHz IF			*/

	write_i2c(5, TSA6060T_ADDR, (f << 1) | 1, f >> 7, 0x60 | ((f >> 15) & 1), 0);
}

static int tr_do_ioctl(struct inode *inode, struct file *file,
		       unsigned int cmd, void *arg)
{
	switch(cmd)
	{
		case VIDIOCGCAP:
		{
			struct video_capability *v = arg;

			memset(v,0,sizeof(*v));
			v->type=VID_TYPE_TUNER;
			v->channels=1;
			v->audios=1;
			strcpy(v->name, "Trust FM Radio");

			return 0;
		}
		case VIDIOCGTUNER:
		{
			struct video_tuner *v = arg;

			if(v->tuner)	/* Only 1 tuner */ 
				return -EINVAL;

			v->rangelow = 87500 * 16;
			v->rangehigh = 108000 * 16;
			v->flags = VIDEO_TUNER_LOW;
			v->mode = VIDEO_MODE_AUTO;

			v->signal = tr_getsigstr();
			if(tr_getstereo())
				v->flags |= VIDEO_TUNER_STEREO_ON;

			strcpy(v->name, "FM");

			return 0;
		}
		case VIDIOCSTUNER:
		{
			struct video_tuner *v = arg;
			if(v->tuner != 0)
				return -EINVAL;
			return 0;
		}
		case VIDIOCGFREQ:
		{
			unsigned long *freq = arg;
			*freq = curfreq;
			return 0;
		}
		case VIDIOCSFREQ:
		{
			unsigned long *freq = arg;
			tr_setfreq(*freq);
			return 0;
		}
		case VIDIOCGAUDIO:
		{	
			struct video_audio *v = arg;

			memset(v,0, sizeof(*v));
			v->flags = VIDEO_AUDIO_MUTABLE | VIDEO_AUDIO_VOLUME |
			          VIDEO_AUDIO_BASS | VIDEO_AUDIO_TREBLE;
			v->mode = curstereo? VIDEO_SOUND_STEREO : VIDEO_SOUND_MONO;
			v->volume = curvol * 2048;
			v->step = 2048;
			v->bass = curbass * 4370;
			v->treble = curtreble * 4370;
			
			strcpy(v->name, "Trust FM Radio");
			return 0;			
		}
		case VIDIOCSAUDIO:
		{
			struct video_audio *v = arg;

			if(v->audio) 
				return -EINVAL;
			tr_setvol(v->volume);					
			tr_setbass(v->bass);
			tr_settreble(v->treble);
			tr_setstereo(v->mode & VIDEO_SOUND_STEREO);
			tr_setmute(v->flags & VIDEO_AUDIO_MUTE);
			return 0;
		}
		default:
			return -ENOIOCTLCMD;
	}
}

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

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

static struct video_device trust_radio=
{
	.owner		= THIS_MODULE,
	.name		= "Trust FM Radio",
	.type		= VID_TYPE_TUNER,
	.hardware	= VID_HARDWARE_TRUST,
	.fops           = &trust_fops,
};

static int __init trust_init(void)
{
	if(io == -1) {
		printk(KERN_ERR "You must set an I/O address with io=0x???\n");
		return -EINVAL;
	}
	if(!request_region(io, 2, "Trust FM Radio")) {
		printk(KERN_ERR "trust: port 0x%x already in use\n", io);
		return -EBUSY;
	}
	if(video_register_device(&trust_radio, VFL_TYPE_RADIO, radio_nr)==-1)
	{
		release_region(io, 2);
		return -EINVAL;
	}

	printk(KERN_INFO "Trust FM Radio card driver v1.0.\n");

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

	tr_setvol(0x8000);					
	tr_setbass(0x8000);
	tr_settreble(0x8000);
	tr_setstereo(1);

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

	return 0;
}

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");

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);

static void __exit cleanup_trust_module(void)
{
	video_unregister_device(&trust_radio);
	release_region(io, 2);
}

module_init(trust_init);
module_exit(cleanup_trust_module);