aboutsummaryrefslogtreecommitdiffstats
path: root/drivers/media/radio/radio-maxiradio.c
blob: 02d39a50d5ed2b742d6e2b65678056a249e096b7 (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
/* 
 * Guillemot Maxi Radio FM 2000 PCI radio card driver for Linux 
 * (C) 2001 Dimitromanolakis Apostolos <apdim@grecian.net>
 *
 * Based in the radio Maestro PCI driver. Actually it uses the same chip
 * for radio but different pci controller.
 *
 * I didn't have any specs I reversed engineered the protocol from
 * the windows driver (radio.dll). 
 *
 * The card uses the TEA5757 chip that includes a search function but it
 * is useless as I haven't found any way to read back the frequency. If 
 * anybody does please mail me.
 *
 * For the pdf file see:
 * http://www.semiconductors.philips.com/pip/TEA5757H/V1
 *
 *
 * CHANGES:
 *   0.75b
 *     - better pci interface thanks to Francois Romieu <romieu@cogenit.fr>
 *
 *   0.75
 *     - tiding up
 *     - removed support for multiple devices as it didn't work anyway
 *
 * BUGS: 
 *   - card unmutes if you change frequency
 *
 */


#include <linux/module.h>
#include <linux/init.h>
#include <linux/ioport.h>
#include <linux/delay.h>
#include <linux/sched.h>
#include <asm/io.h>
#include <asm/uaccess.h>
#include <asm/semaphore.h>
#include <linux/pci.h>
#include <linux/videodev.h>

/* version 0.75      Sun Feb  4 22:51:27 EET 2001 */
#define DRIVER_VERSION	"0.75"

#ifndef PCI_VENDOR_ID_GUILLEMOT
#define PCI_VENDOR_ID_GUILLEMOT 0x5046
#endif

#ifndef PCI_DEVICE_ID_GUILLEMOT
#define PCI_DEVICE_ID_GUILLEMOT_MAXIRADIO 0x1001
#endif


/* TEA5757 pin mappings */
static const int clk = 1, data = 2, wren = 4, mo_st = 8, power = 16 ;

static int radio_nr = -1;
module_param(radio_nr, int, 0);


#define FREQ_LO		 50*16000
#define FREQ_HI		150*16000

#define FREQ_IF         171200 /* 10.7*16000   */
#define FREQ_STEP       200    /* 12.5*16      */

#define FREQ2BITS(x)	((( (unsigned int)(x)+FREQ_IF+(FREQ_STEP<<1))\
			/(FREQ_STEP<<2))<<2) /* (x==fmhz*16*1000) -> bits */

#define BITS2FREQ(x)	((x) * FREQ_STEP - FREQ_IF)


static int radio_ioctl(struct inode *inode, struct file *file,
		       unsigned int cmd, unsigned long arg);

static struct file_operations maxiradio_fops = {
	.owner		= THIS_MODULE,
	.open           = video_exclusive_open,
	.release        = video_exclusive_release,
	.ioctl	        = radio_ioctl,
	.llseek         = no_llseek,
};
static struct video_device maxiradio_radio =
{
	.owner		= THIS_MODULE,
	.name		= "Maxi Radio FM2000 radio",
	.type		= VID_TYPE_TUNER,
	.hardware	= VID_HARDWARE_SF16MI,
	.fops           = &maxiradio_fops,
};

static struct radio_device
{
	__u16	io,	/* base of radio io */
		muted,	/* VIDEO_AUDIO_MUTE */
		stereo,	/* VIDEO_TUNER_STEREO_ON */	
		tuned;	/* signal strength (0 or 0xffff) */
		
	unsigned long freq;
	
	struct  semaphore lock;
} radio_unit = {0, 0, 0, 0, };


static void outbit(unsigned long bit, __u16 io)
{
	if(bit != 0)
		{
			outb(  power|wren|data     ,io); udelay(4);
			outb(  power|wren|data|clk ,io); udelay(4);
			outb(  power|wren|data     ,io); udelay(4);
		}
	else	
		{
			outb(  power|wren          ,io); udelay(4);
			outb(  power|wren|clk      ,io); udelay(4);
			outb(  power|wren          ,io); udelay(4);
		}
}

static void turn_power(__u16 io, int p)
{
	if(p != 0) outb(power, io); else outb(0,io);
}


static void set_freq(__u16 io, __u32 data)
{
	unsigned long int si;
	int bl;
	
	/* TEA5757 shift register bits (see pdf) */

	outbit(0,io); // 24  search 
	outbit(1,io); // 23  search up/down
	
	outbit(0,io); // 22  stereo/mono

	outbit(0,io); // 21  band
	outbit(0,io); // 20  band (only 00=FM works I think)

	outbit(0,io); // 19  port ?
	outbit(0,io); // 18  port ?
	
	outbit(0,io); // 17  search level
	outbit(0,io); // 16  search level
 
	si = 0x8000;
	for(bl = 1; bl <= 16 ; bl++) { outbit(data & si,io); si >>=1; }
	
	outb(power,io);
}

static int get_stereo(__u16 io)
{	
	outb(power,io); udelay(4);
	return !(inb(io) & mo_st);
}

static int get_tune(__u16 io)
{	
	outb(power+clk,io); udelay(4);
	return !(inb(io) & mo_st);
}


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

	switch(cmd) {
		case VIDIOCGCAP: {
			struct video_capability *v = arg;
			
			memset(v,0,sizeof(*v));
			strcpy(v->name, "Maxi Radio FM2000 radio");
			v->type=VID_TYPE_TUNER;
			v->channels=v->audios=1;
			return 0;
		}
		case VIDIOCGTUNER: {
			struct video_tuner *v = arg;
			
			if(v->tuner)
				return -EINVAL;
				
			card->stereo = 0xffff * get_stereo(card->io);
			card->tuned = 0xffff * get_tune(card->io);
			
			v->flags = VIDEO_TUNER_LOW | card->stereo;
			v->signal = card->tuned;
			
			strcpy(v->name, "FM");
			
			v->rangelow = FREQ_LO;
			v->rangehigh = FREQ_HI;
			v->mode = VIDEO_MODE_AUTO;
			
			return 0;
		}
		case VIDIOCSTUNER: {
			struct video_tuner *v = arg;
			if(v->tuner!=0)
				return -EINVAL;
			return 0;
		}
		case VIDIOCGFREQ: {
			unsigned long *freq = arg;
			
			*freq = card->freq;
			return 0;
		}
		case VIDIOCSFREQ: {
			unsigned long *freq = arg;
			
			if (*freq < FREQ_LO || *freq > FREQ_HI)
				return -EINVAL;
			card->freq = *freq;
			set_freq(card->io, FREQ2BITS(card->freq));
			msleep(125);
			return 0;
		}
		case VIDIOCGAUDIO: {	
			struct video_audio *v = arg;
			memset(v,0,sizeof(*v));
			strcpy(v->name, "Radio");
			v->flags=VIDEO_AUDIO_MUTABLE | card->muted;
			v->mode=VIDEO_SOUND_STEREO;
			return 0;		
		}
		
		case VIDIOCSAUDIO: {
			struct video_audio *v = arg;
			
			if(v->audio)
				return -EINVAL;
			card->muted = v->flags & VIDEO_AUDIO_MUTE;
			if(card->muted)
				turn_power(card->io, 0);
			else
				set_freq(card->io, FREQ2BITS(card->freq));
			return 0;
		}
		case VIDIOCGUNIT: {
			struct video_unit *v = arg;
			
			v->video=VIDEO_NO_UNIT;
			v->vbi=VIDEO_NO_UNIT;
			v->radio=dev->minor;
			v->audio=0;
			v->teletext=VIDEO_NO_UNIT;
			return 0;		
		}
		default: return -ENOIOCTLCMD;
	}
}

static int radio_ioctl(struct inode *inode, struct file *file,
		       unsigned int cmd, unsigned long arg)
{
	struct video_device *dev = video_devdata(file);
	struct radio_device *card=dev->priv;
	int ret;
	
	down(&card->lock);
	ret = video_usercopy(inode, file, cmd, arg, radio_function);
	up(&card->lock);
	return ret;
}

MODULE_AUTHOR("Dimitromanolakis Apostolos, apdim@grecian.net");
MODULE_DESCRIPTION("Radio driver for the Guillemot Maxi Radio FM2000 radio.");
MODULE_LICENSE("GPL");


static int __devinit maxiradio_init_one(struct pci_dev *pdev, const struct pci_device_id *ent)
{
	if(!request_region(pci_resource_start(pdev, 0),
	                   pci_resource_len(pdev, 0), "Maxi Radio FM 2000")) {
	        printk(KERN_ERR "radio-maxiradio: can't reserve I/O ports\n");
	        goto err_out;
	}

	if (pci_enable_device(pdev))
	        goto err_out_free_region;

	radio_unit.io = pci_resource_start(pdev, 0);
	init_MUTEX(&radio_unit.lock);
	maxiradio_radio.priv = &radio_unit;

	if(video_register_device(&maxiradio_radio, VFL_TYPE_RADIO, radio_nr)==-1) {
	        printk("radio-maxiradio: can't register device!");
	        goto err_out_free_region;
	}

	printk(KERN_INFO "radio-maxiradio: version "
	       DRIVER_VERSION
	       " time "
	       __TIME__ "  "
	       __DATE__
	       "\n");

	printk(KERN_INFO "radio-maxiradio: found Guillemot MAXI Radio device (io = 0x%x)\n",
	       radio_unit.io);
	return 0;

err_out_free_region:
	release_region(pci_resource_start(pdev, 0), pci_resource_len(pdev, 0));
err_out:
	return -ENODEV;
}

static void __devexit maxiradio_remove_one(struct pci_dev *pdev)
{
	video_unregister_device(&maxiradio_radio);
	release_region(pci_resource_start(pdev, 0), pci_resource_len(pdev, 0));
}

static struct pci_device_id maxiradio_pci_tbl[] = {
	{ PCI_VENDOR_ID_GUILLEMOT, PCI_DEVICE_ID_GUILLEMOT_MAXIRADIO,
		PCI_ANY_ID, PCI_ANY_ID, },
	{ 0,}
};

MODULE_DEVICE_TABLE(pci, maxiradio_pci_tbl);

static struct pci_driver maxiradio_driver = {
	.name		= "radio-maxiradio",
	.id_table	= maxiradio_pci_tbl,
	.probe		= maxiradio_init_one,
	.remove		= __devexit_p(maxiradio_remove_one),
};

static int __init maxiradio_radio_init(void)
{
	return pci_module_init(&maxiradio_driver);
}

static void __exit maxiradio_radio_exit(void)
{
	pci_unregister_driver(&maxiradio_driver);
}

module_init(maxiradio_radio_init);
module_exit(maxiradio_radio_exit);