aboutsummaryrefslogtreecommitdiffstats
path: root/drivers/media/radio/radio-maestro.c
blob: e5e2021a7312f4c82eee58b96e2a5bde455809dc (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
/* Maestro PCI sound card radio driver for Linux support
 * (c) 2000 A. Tlalka, atlka@pg.gda.pl
 * Notes on the hardware
 *
 *  + Frequency control is done digitally 
 *  + No volume control - only mute/unmute - you have to use Aux line volume
 *  control on Maestro card to set the volume
 *  + Radio status (tuned/not_tuned and stereo/mono) is valid some time after
 *  frequency setting (>100ms) and only when the radio is unmuted.
 *  version 0.02
 *  + io port is automatically detected - only the first radio is used
 *  version 0.03
 *  + thread access locking additions
 *  version 0.04
 * + code improvements
 * + VIDEO_TUNER_LOW is permanent
 */

#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>

#define DRIVER_VERSION	"0.04"

#define PCI_VENDOR_ESS                  0x125D
#define PCI_DEVICE_ID_ESS_ESS1968       0x1968          /* Maestro 2    */
#define PCI_DEVICE_ID_ESS_ESS1978       0x1978          /* Maestro 2E   */

#define GPIO_DATA       0x60   /* port offset from ESS_IO_BASE */

#define IO_MASK		4      /* mask      register offset from GPIO_DATA
				bits 1=unmask write to given bit */
#define IO_DIR		8      /* direction register offset from GPIO_DATA
				bits 0/1=read/write direction */

#define GPIO6           0x0040 /* mask bits for GPIO lines */
#define GPIO7           0x0080
#define GPIO8           0x0100
#define GPIO9           0x0200

#define STR_DATA        GPIO6  /* radio TEA5757 pins and GPIO bits */
#define STR_CLK         GPIO7
#define STR_WREN        GPIO8
#define STR_MOST        GPIO9

#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_nr = -1;
module_param(radio_nr, int, 0);

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

static struct file_operations maestro_fops = {
	.owner		= THIS_MODULE,
	.open           = video_exclusive_open,
	.release        = video_exclusive_release,
	.ioctl		= radio_ioctl,
	.llseek         = no_llseek,
};

static struct video_device maestro_radio=
{
	.owner		= THIS_MODULE,
	.name		= "Maestro radio",
	.type		= VID_TYPE_TUNER,
	.hardware	= VID_HARDWARE_SF16MI,
	.fops           = &maestro_fops,
};

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

static __u32 radio_bits_get(struct radio_device *dev)
{
	register __u16 io=dev->io, l, rdata;
	register __u32 data=0;
	__u16 omask;
	omask = inw(io + IO_MASK);
	outw(~(STR_CLK | STR_WREN), io + IO_MASK);
	outw(0, io);
	udelay(16);

	for (l=24;l--;) {
		outw(STR_CLK, io);		/* HI state */
		udelay(2);
		if(!l) 
			dev->tuned = inw(io) & STR_MOST ? 0 : 0xffff;
		outw(0, io);			/* LO state */
		udelay(2);
		data <<= 1;			/* shift data */
		rdata = inw(io);
		if(!l)
			dev->stereo =  rdata & STR_MOST ? 
			0 : VIDEO_TUNER_STEREO_ON;
		else
			if(rdata & STR_DATA)
				data++;
		udelay(2);
	}
	if(dev->muted)
		outw(STR_WREN, io);
	udelay(4);
	outw(omask, io + IO_MASK);
	return data & 0x3ffe;
}

static void radio_bits_set(struct radio_device *dev, __u32 data)
{
	register __u16 io=dev->io, l, bits;
	__u16 omask, odir;
	omask = inw(io + IO_MASK);
	odir  = (inw(io + IO_DIR) & ~STR_DATA) | (STR_CLK | STR_WREN);
	outw(odir | STR_DATA, io + IO_DIR);
	outw(~(STR_DATA | STR_CLK | STR_WREN), io + IO_MASK);
	udelay(16);
	for (l=25;l;l--) {
		bits = ((data >> 18) & STR_DATA) | STR_WREN ;
		data <<= 1;			/* shift data */
		outw(bits, io);			/* start strobe */
		udelay(2);
		outw(bits | STR_CLK, io);	/* HI level */
		udelay(2);
		outw(bits, io);			/* LO level */
		udelay(4);
	}
	if(!dev->muted)
		outw(0, io);
	udelay(4);
	outw(omask, io + IO_MASK);
	outw(odir, io + IO_DIR);
	msleep(125);
}

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, "Maestro 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;
			(void)radio_bits_get(card);
			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 = BITS2FREQ(radio_bits_get(card));
			return 0;
		}
		case VIDIOCSFREQ: {
			unsigned long *freq = arg;
			if (*freq<FREQ_LO || *freq>FREQ_HI )
				return -EINVAL;
			radio_bits_set(card, FREQ2BITS(*freq));
			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;
			{
				register __u16 io=card->io;
				register __u16 omask = inw(io + IO_MASK);
				outw(~STR_WREN, io + IO_MASK);
				outw((card->muted = v->flags & VIDEO_AUDIO_MUTE)
				     ? STR_WREN : 0, io);
				udelay(4);
				outw(omask, io + IO_MASK);
				msleep(125);
				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;
}

static __u16 radio_install(struct pci_dev *pcidev);

MODULE_AUTHOR("Adam Tlalka, atlka@pg.gda.pl");
MODULE_DESCRIPTION("Radio driver for the Maestro PCI sound card radio.");
MODULE_LICENSE("GPL");

static void __exit maestro_radio_exit(void)
{
	video_unregister_device(&maestro_radio);
}

static int __init maestro_radio_init(void)
{
	register __u16 found=0;
	struct pci_dev *pcidev = NULL;
	while(!found && (pcidev = pci_find_device(PCI_VENDOR_ESS, 
						  PCI_DEVICE_ID_ESS_ESS1968,
						  pcidev)))
		found |= radio_install(pcidev);
	while(!found && (pcidev = pci_find_device(PCI_VENDOR_ESS,
						  PCI_DEVICE_ID_ESS_ESS1978, 
						  pcidev)))
		found |= radio_install(pcidev);
	if(!found) {
		printk(KERN_INFO "radio-maestro: no devices found.\n");
		return -ENODEV;
	}
	return 0;
}

module_init(maestro_radio_init);
module_exit(maestro_radio_exit);

static inline __u16 radio_power_on(struct radio_device *dev)
{
	register __u16 io=dev->io;
	register __u32 ofreq;
	__u16 omask, odir;
	omask = inw(io + IO_MASK);
	odir  = (inw(io + IO_DIR) & ~STR_DATA) | (STR_CLK | STR_WREN);
	outw(odir & ~STR_WREN, io + IO_DIR);
	dev->muted = inw(io) & STR_WREN ? 0 : VIDEO_AUDIO_MUTE;
	outw(odir, io + IO_DIR);
	outw(~(STR_WREN | STR_CLK), io + IO_MASK);
	outw(dev->muted ? 0 : STR_WREN, io);
	udelay(16);
	outw(omask, io + IO_MASK);
	ofreq = radio_bits_get(dev);
	if((ofreq<FREQ2BITS(FREQ_LO)) || (ofreq>FREQ2BITS(FREQ_HI)))
		ofreq = FREQ2BITS(FREQ_LO);
	radio_bits_set(dev, ofreq);
	return (ofreq == radio_bits_get(dev));
}

static __u16 radio_install(struct pci_dev *pcidev)
{
	if(((pcidev->class >> 8) & 0xffff) != PCI_CLASS_MULTIMEDIA_AUDIO)
		return 0;
	
	radio_unit.io = pcidev->resource[0].start + GPIO_DATA;
	maestro_radio.priv = &radio_unit;
	init_MUTEX(&radio_unit.lock);
	
	if(radio_power_on(&radio_unit)) {
		if(video_register_device(&maestro_radio, VFL_TYPE_RADIO, radio_nr)==-1) {
			printk("radio-maestro: can't register device!");
			return 0;
		}
		printk(KERN_INFO "radio-maestro: version "
		       DRIVER_VERSION 
		       " time " 
		       __TIME__ "  "
		       __DATE__
		       "\n");
		printk(KERN_INFO "radio-maestro: radio chip initialized\n");
		return 1;
	} else
		return 0;   
}

Privacy Policy