summaryrefslogtreecommitdiff
path: root/drivers/media/radio/radio-gemtek.c
blob: 47173be97b9fa5dbd74d84e6e5ebce0007393609 (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
/* GemTek radio card driver for Linux (C) 1998 Jonas Munsin <jmunsin@iki.fi>
 *
 * GemTek hasn't released any specs on the card, so the protocol had to
 * be reverse engineered with dosemu.
 *
 * Besides the protocol changes, this is mostly a copy of:
 *
 *    RadioTrack II driver for Linux radio support (C) 1998 Ben Pfaff
 * 
 *    Based on RadioTrack I/RadioReveal (C) 1997 M. Kirkwood
 *    Converted to new API by Alan Cox <Alan.Cox@linux.org>
 *    Various bugfixes and enhancements by Russell Kroll <rkroll@exploits.org>
 *
 * TODO: Allow for more than one of these foolish entities :-)
 *
 */

#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/videodev.h>	/* kernel radio structs		*/
#include <linux/config.h>	/* CONFIG_RADIO_GEMTEK_PORT 	*/
#include <linux/spinlock.h>

#ifndef CONFIG_RADIO_GEMTEK_PORT
#define CONFIG_RADIO_GEMTEK_PORT -1
#endif

static int io = CONFIG_RADIO_GEMTEK_PORT; 
static int radio_nr = -1;
static spinlock_t lock;

struct gemtek_device
{
	int port;
	unsigned long curfreq;
	int muted;
};


/* local things */

/* the correct way to mute the gemtek may be to write the last written
 * frequency || 0x10, but just writing 0x10 once seems to do it as well
 */
static void gemtek_mute(struct gemtek_device *dev)
{
        if(dev->muted)
		return;
	spin_lock(&lock);
	outb(0x10, io);
	spin_unlock(&lock);
	dev->muted = 1;
}

static void gemtek_unmute(struct gemtek_device *dev)
{
	if(dev->muted == 0)
		return;
	spin_lock(&lock);
	outb(0x20, io);
	spin_unlock(&lock);
	dev->muted = 0;
}

static void zero(void)
{
	outb_p(0x04, io);
	udelay(5);
	outb_p(0x05, io);
	udelay(5);
}

static void one(void)
{
	outb_p(0x06, io);
	udelay(5);
	outb_p(0x07, io);
	udelay(5);
}

static int gemtek_setfreq(struct gemtek_device *dev, unsigned long freq)
{
	int i;

/*        freq = 78.25*((float)freq/16000.0 + 10.52); */

	freq /= 16;
	freq += 10520;
	freq *= 7825;
	freq /= 100000;

	spin_lock(&lock);
	
	/* 2 start bits */
	outb_p(0x03, io);
	udelay(5);
	outb_p(0x07, io);
	udelay(5);

        /* 28 frequency bits (lsb first) */
	for (i = 0; i < 14; i++)
		if (freq & (1 << i))
			one();
		else
			zero();
        /* 36 unknown bits */
	for (i = 0; i < 11; i++)
		zero();
	one();
	for (i = 0; i < 4; i++)
		zero();
	one();
	zero();

	/* 2 end bits */
	outb_p(0x03, io);
	udelay(5);
	outb_p(0x07, io);
	udelay(5);

	spin_unlock(&lock);
	
	return 0;
}

static int gemtek_getsigstr(struct gemtek_device *dev)
{
	spin_lock(&lock);
	inb(io);
	udelay(5);
	spin_unlock(&lock);
	if (inb(io) & 8)		/* bit set = no signal present */
		return 0;
	return 1;		/* signal present */
}

static int gemtek_do_ioctl(struct inode *inode, struct file *file,
			   unsigned int cmd, void *arg)
{
	struct video_device *dev = video_devdata(file);
	struct gemtek_device *rt=dev->priv;

	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, "GemTek");
			return 0;
		}
		case VIDIOCGTUNER:
		{
			struct video_tuner *v = arg;
			if(v->tuner)	/* Only 1 tuner */ 
				return -EINVAL;
			v->rangelow=87*16000;
			v->rangehigh=108*16000;
			v->flags=VIDEO_TUNER_LOW;
			v->mode=VIDEO_MODE_AUTO;
			v->signal=0xFFFF*gemtek_getsigstr(rt);
			strcpy(v->name, "FM");
			return 0;
		}
		case VIDIOCSTUNER:
		{
			struct video_tuner *v = arg;
			if(v->tuner!=0)
				return -EINVAL;
			/* Only 1 tuner so no setting needed ! */
			return 0;
		}
		case VIDIOCGFREQ:
		{
			unsigned long *freq = arg;
			*freq = rt->curfreq;
			return 0;
		}
		case VIDIOCSFREQ:
		{
			unsigned long *freq = arg;
			rt->curfreq = *freq;
			/* needs to be called twice in order for getsigstr to work */
			gemtek_setfreq(rt, rt->curfreq);
			gemtek_setfreq(rt, rt->curfreq);
			return 0;
		}
		case VIDIOCGAUDIO:
		{	
			struct video_audio *v = arg;
			memset(v,0, sizeof(*v));
			v->flags|=VIDEO_AUDIO_MUTABLE;
			v->volume=1;
			v->step=65535;
			strcpy(v->name, "Radio");
			return 0;			
		}
		case VIDIOCSAUDIO:
		{
			struct video_audio *v = arg;
			if(v->audio) 
				return -EINVAL;

			if(v->flags&VIDEO_AUDIO_MUTE) 
				gemtek_mute(rt);
			else
			        gemtek_unmute(rt);

			return 0;
		}
		default:
			return -ENOIOCTLCMD;
	}
}

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

static struct gemtek_device gemtek_unit;

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

static struct video_device gemtek_radio=
{
	.owner		= THIS_MODULE,
	.name		= "GemTek radio",
	.type		= VID_TYPE_TUNER,
	.hardware	= VID_HARDWARE_GEMTEK,
	.fops           = &gemtek_fops,
};

static int __init gemtek_init(void)
{
	if(io==-1)
	{
		printk(KERN_ERR "You must set an I/O address with io=0x20c, io=0x30c, io=0x24c or io=0x34c (io=0x020c or io=0x248 for the combined sound/radiocard)\n");
		return -EINVAL;
	}

	if (!request_region(io, 4, "gemtek")) 
	{
		printk(KERN_ERR "gemtek: port 0x%x already in use\n", io);
		return -EBUSY;
	}

	gemtek_radio.priv=&gemtek_unit;
	
	if(video_register_device(&gemtek_radio, VFL_TYPE_RADIO, radio_nr)==-1)
	{
		release_region(io, 4);
		return -EINVAL;
	}
	printk(KERN_INFO "GemTek Radio Card driver.\n");

	spin_lock_init(&lock);

	/* this is _maybe_ unnecessary */
	outb(0x01, io);

 	/* mute card - prevents noisy bootups */
	gemtek_unit.muted = 0;
	gemtek_mute(&gemtek_unit);

	return 0;
}

MODULE_AUTHOR("Jonas Munsin");
MODULE_DESCRIPTION("A driver for the GemTek Radio Card");
MODULE_LICENSE("GPL");

module_param(io, int, 0);
MODULE_PARM_DESC(io, "I/O address of the GemTek card (0x20c, 0x30c, 0x24c or 0x34c (0x20c or 0x248 have been reported to work for the combined sound/radiocard)).");
module_param(radio_nr, int, 0);

static void __exit gemtek_cleanup(void)
{
	video_unregister_device(&gemtek_radio);
	release_region(io,4);
}

module_init(gemtek_init);
module_exit(gemtek_cleanup);

/*
  Local variables:
  compile-command: "gcc -c -DMODVERSIONS -D__KERNEL__ -DMODULE -O6 -Wall -Wstrict-prototypes -I /home/blp/tmp/linux-2.1.111-rtrack/include radio-rtrack2.c"
  End:
*/