aboutsummaryrefslogtreecommitdiffstats
path: root/drivers/media/radio/radio-gemtek-pci.c
blob: 42c8fce04aa2650aeded8b2f6e21f9adec07ac85 (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
/*
 ***************************************************************************
 *     
 *     radio-gemtek-pci.c - Gemtek PCI Radio driver
 *     (C) 2001 Vladimir Shebordaev <vshebordaev@mail.ru>
 *
 ***************************************************************************
 *
 *     This program is free software; you can redistribute it and/or
 *     modify it under the terms of the GNU General Public License as
 *     published by the Free Software Foundation; either version 2 of
 *     the License, or (at your option) any later version.
 *
 *     This program is distributed in the hope that it will be useful,
 *     but WITHOUT ANY WARRANTY; without even the implied warranty of
 *     MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 *     GNU General Public License for more details.
 *
 *     You should have received a copy of the GNU General Public
 *     License along with this program; if not, write to the Free
 *     Software Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139,
 *     USA.
 *
 ***************************************************************************
 *
 *     Gemtek Corp still silently refuses to release any specifications
 *     of their multimedia devices, so the protocol still has to be
 *     reverse engineered.
 *
 *     The v4l code was inspired by Jonas Munsin's  Gemtek serial line
 *     radio device driver.
 *
 *     Please, let me know if this piece of code was useful :)
 * 
 *     TODO: multiple device support and portability were not tested
 *
 ***************************************************************************
 */

#include <linux/config.h>
#include <linux/types.h>
#include <linux/list.h>
#include <linux/module.h>
#include <linux/init.h>
#include <linux/pci.h>
#include <linux/videodev.h>
#include <linux/errno.h>

#include <asm/io.h>
#include <asm/uaccess.h>

#ifndef PCI_VENDOR_ID_GEMTEK
#define PCI_VENDOR_ID_GEMTEK 0x5046
#endif

#ifndef PCI_DEVICE_ID_GEMTEK_PR103
#define PCI_DEVICE_ID_GEMTEK_PR103 0x1001
#endif

#ifndef GEMTEK_PCI_RANGE_LOW
#define GEMTEK_PCI_RANGE_LOW (87*16000)
#endif

#ifndef GEMTEK_PCI_RANGE_HIGH
#define GEMTEK_PCI_RANGE_HIGH (108*16000)
#endif

#ifndef TRUE
#define TRUE (1)
#endif

#ifndef FALSE 
#define FALSE (0)
#endif

struct gemtek_pci_card {
	struct video_device *videodev;
	
	u32 iobase;
	u32 length;
	u8  chiprev;
	u16 model;
	
	u32 current_frequency;
	u8  mute;
};

static const char rcsid[] = "$Id: radio-gemtek-pci.c,v 1.1 2001/07/23 08:08:16 ted Exp ted $";

static int nr_radio = -1;

static inline u8 gemtek_pci_out( u16 value, u32 port )
{
	outw( value, port );

	return (u8)value;
}

#define _b0( v ) *((u8 *)&v)  
static void __gemtek_pci_cmd( u16 value, u32 port, u8 *last_byte, int keep )
{
	register u8 byte = *last_byte;

	if ( !value ) {
		if ( !keep )
			value = (u16)port;
		byte &= 0xfd;	
	} else
		byte |= 2;

	_b0( value ) = byte;
	outw( value, port );
	byte |= 1;
	_b0( value ) = byte;
	outw( value, port );
	byte &= 0xfe;
	_b0( value ) = byte;
	outw( value, port );
	
	*last_byte = byte;
}

static inline void gemtek_pci_nil( u32 port, u8 *last_byte )
{
	__gemtek_pci_cmd( 0x00, port, last_byte, FALSE );
}

static inline void gemtek_pci_cmd( u16 cmd, u32 port, u8 *last_byte )
{
	__gemtek_pci_cmd( cmd, port, last_byte, TRUE );
}

static void gemtek_pci_setfrequency( struct gemtek_pci_card *card, unsigned long frequency )
{
	register int i;
	register u32 value = frequency / 200 + 856;
	register u16 mask = 0x8000;
	u8 last_byte;
	u32 port = card->iobase;

	last_byte = gemtek_pci_out( 0x06, port );

	i = 0;
	do {
		gemtek_pci_nil( port, &last_byte );
		i++;
	} while ( i < 9 );

	i = 0;
	do {
		gemtek_pci_cmd( value & mask, port, &last_byte );
		mask >>= 1;
		i++;
	} while ( i < 16 );

	outw( 0x10, port );
}


static inline void gemtek_pci_mute( struct gemtek_pci_card *card )
{
	outb( 0x1f, card->iobase );
	card->mute = TRUE;
}

static inline void gemtek_pci_unmute( struct gemtek_pci_card *card )
{
	if ( card->mute ) {
		gemtek_pci_setfrequency( card, card->current_frequency );
		card->mute = FALSE;
	}
}

static inline unsigned int gemtek_pci_getsignal( struct gemtek_pci_card *card )
{
	return ( inb( card->iobase ) & 0x08 ) ? 0 : 1;
}

static int gemtek_pci_do_ioctl(struct inode *inode, struct file *file,
			       unsigned int cmd, void *arg)
{
	struct video_device *dev = video_devdata(file);
	struct gemtek_pci_card *card = dev->priv;

	switch ( cmd ) {
		case VIDIOCGCAP:
		{
			struct video_capability *c = arg;

			memset(c,0,sizeof(*c));
			c->type = VID_TYPE_TUNER;
			c->channels = 1;
			c->audios = 1;
			strcpy( c->name, "Gemtek PCI Radio" );
			return 0;
		} 

		case VIDIOCGTUNER:
		{
			struct video_tuner *t = arg;

			if ( t->tuner ) 
				return -EINVAL;

			t->rangelow = GEMTEK_PCI_RANGE_LOW;
			t->rangehigh = GEMTEK_PCI_RANGE_HIGH;
			t->flags = VIDEO_TUNER_LOW;
			t->mode = VIDEO_MODE_AUTO;
			t->signal = 0xFFFF * gemtek_pci_getsignal( card );
			strcpy( t->name, "FM" );
			return 0;
		}

		case VIDIOCSTUNER:
		{
			struct video_tuner *t = arg;
			if ( t->tuner )
				return -EINVAL;
			return 0;
		}

		case VIDIOCGFREQ:
		{
			unsigned long *freq = arg;
			*freq = card->current_frequency;
			return 0;
		}
		case VIDIOCSFREQ:
		{
			unsigned long *freq = arg;
	 
			if ( (*freq < GEMTEK_PCI_RANGE_LOW) ||
			     (*freq > GEMTEK_PCI_RANGE_HIGH) )
				return -EINVAL;

			gemtek_pci_setfrequency( card, *freq );
			card->current_frequency = *freq;
			card->mute = FALSE;

			return 0;
		}
  
		case VIDIOCGAUDIO:
		{	
			struct video_audio *a = arg;

			memset( a, 0, sizeof( *a ) );
			a->flags |= VIDEO_AUDIO_MUTABLE;
			a->volume = 1;
			a->step = 65535;
			strcpy( a->name, "Radio" );
			return 0;			
		}

		case VIDIOCSAUDIO:
		{
			struct video_audio *a = arg;

			if ( a->audio ) 
				return -EINVAL;

			if ( a->flags & VIDEO_AUDIO_MUTE ) 
				gemtek_pci_mute( card );
			else
				gemtek_pci_unmute( card );
			return 0;
		}

		default:
			return -ENOIOCTLCMD;
	}
}

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

enum {
	GEMTEK_PR103
};

static char *card_names[] __devinitdata = {
	"GEMTEK_PR103"
};

static struct pci_device_id gemtek_pci_id[] =
{
	{ PCI_VENDOR_ID_GEMTEK, PCI_DEVICE_ID_GEMTEK_PR103,
	  PCI_ANY_ID, PCI_ANY_ID, 0, 0, GEMTEK_PR103 },
	{ 0 }
};

MODULE_DEVICE_TABLE( pci, gemtek_pci_id );

static int mx = 1;

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

static struct video_device vdev_template = {
	.owner         = THIS_MODULE,
	.name          = "Gemtek PCI Radio",
	.type          = VID_TYPE_TUNER,
	.hardware      = VID_HARDWARE_GEMTEK,
	.fops          = &gemtek_pci_fops,
};

static int __devinit gemtek_pci_probe( struct pci_dev *pci_dev, const struct pci_device_id *pci_id )
{
	struct gemtek_pci_card *card;
	struct video_device *devradio;

	if ( (card = kmalloc( sizeof( struct gemtek_pci_card ), GFP_KERNEL )) == NULL ) {
		printk( KERN_ERR "gemtek_pci: out of memory\n" );
		return -ENOMEM;
	}
	memset( card, 0, sizeof( struct gemtek_pci_card ) );

	if ( pci_enable_device( pci_dev ) ) 
		goto err_pci;
	
	card->iobase = pci_resource_start( pci_dev, 0 );
	card->length = pci_resource_len( pci_dev, 0 );

	if ( request_region( card->iobase, card->length, card_names[pci_id->driver_data] ) == NULL ) {
		printk( KERN_ERR "gemtek_pci: i/o port already in use\n" );
		goto err_pci;
	}

	pci_read_config_byte( pci_dev, PCI_REVISION_ID, &card->chiprev );
	pci_read_config_word( pci_dev, PCI_SUBSYSTEM_ID, &card->model );

	pci_set_drvdata( pci_dev, card );
 
	if ( (devradio = kmalloc( sizeof( struct video_device ), GFP_KERNEL )) == NULL ) {
		printk( KERN_ERR "gemtek_pci: out of memory\n" );
		goto err_video;
	}
	*devradio = vdev_template;

	if ( video_register_device( devradio, VFL_TYPE_RADIO , nr_radio) == -1 ) {
		kfree( devradio );
		goto err_video;
	}

	card->videodev = devradio;
	devradio->priv = card;
	gemtek_pci_mute( card );

	printk( KERN_INFO "Gemtek PCI Radio (rev. %d) found at 0x%04x-0x%04x.\n", 
		card->chiprev, card->iobase, card->iobase + card->length - 1 );

	return 0;

err_video:
	release_region( card->iobase, card->length );

err_pci:
	kfree( card );
	return -ENODEV;        
}

static void __devexit gemtek_pci_remove( struct pci_dev *pci_dev )
{
	struct gemtek_pci_card *card = pci_get_drvdata( pci_dev );

	video_unregister_device( card->videodev );
	kfree( card->videodev );

	release_region( card->iobase, card->length );
	
	if ( mx )
		gemtek_pci_mute( card );

	kfree( card );
	
	pci_set_drvdata( pci_dev, NULL );
}

static struct pci_driver gemtek_pci_driver =
{
	.name		= "gemtek_pci",
	.id_table	= gemtek_pci_id,
	.probe		= gemtek_pci_probe,
	.remove		= __devexit_p(gemtek_pci_remove),
};

static int __init gemtek_pci_init_module( void )
{
	return pci_module_init( &gemtek_pci_driver );
}

static void __exit gemtek_pci_cleanup_module( void )
{
	return pci_unregister_driver( &gemtek_pci_driver );
}

MODULE_AUTHOR( "Vladimir Shebordaev <vshebordaev@mail.ru>" );
MODULE_DESCRIPTION( "The video4linux driver for the Gemtek PCI Radio Card" );
MODULE_LICENSE("GPL");

module_param(mx, bool, 0);
MODULE_PARM_DESC( mx, "single digit: 1 - turn off the turner upon module exit (default), 0 - do not" );
module_param(nr_radio, int, 0);
MODULE_PARM_DESC( nr_radio, "video4linux device number to use");

module_init( gemtek_pci_init_module );
module_exit( gemtek_pci_cleanup_module );

Privacy Policy