summaryrefslogtreecommitdiffstats
path: root/drivers/media/radio/miropcm20-radio.c
blob: c2ebe8754a9569bf326430a08920e3a096a2aa07 (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
/* Miro PCM20 radio driver for Linux radio support
 * (c) 1998 Ruurd Reitsma <R.A.Reitsma@wbmt.tudelft.nl>
 * Thanks to Norberto Pellici for the ACI device interface specification
 * The API part is based on the radiotrack driver by M. Kirkwood
 * This driver relies on the aci mixer (drivers/sound/aci.c)
 * Look there for further info...
 */

/* Revision history:
 *
 *   1998        Ruurd Reitsma <R.A.Reitsma@wbmt.tudelft.nl>
 *   2000-09-05  Robert Siemer <Robert.Siemer@gmx.de>
 *        removed unfinished volume control (maybe adding it later again)
 *        use OSS-mixer; added stereo control
 */

/* What ever you think about the ACI, version 0x07 is not very well!
 * I can't get frequency, 'tuner status', 'tuner flags' or mute/mono
 * conditions...                Robert 
 */

#include <linux/module.h>
#include <linux/init.h>
#include <linux/videodev.h>
#include "../../../sound/oss/aci.h"
#include "miropcm20-rds-core.h"

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

struct pcm20_device {
	unsigned long freq;
	int muted;
	int stereo;
};


static int pcm20_mute(struct pcm20_device *dev, unsigned char mute)
{
	dev->muted = mute;
	return aci_write_cmd(ACI_SET_TUNERMUTE, mute);
}

static int pcm20_stereo(struct pcm20_device *dev, unsigned char stereo)
{
	dev->stereo = stereo;
	return aci_write_cmd(ACI_SET_TUNERMONO, !stereo);
}

static int pcm20_setfreq(struct pcm20_device *dev, unsigned long freq)
{
	unsigned char freql;
	unsigned char freqh;

	dev->freq=freq;

	freq /= 160;
	if (!(aci_version==0x07 || aci_version>=0xb0))
		freq /= 10;  /* I don't know exactly which version
			      * needs this hack */
	freql = freq & 0xff;
	freqh = freq >> 8;

	aci_rds_cmd(RDS_RESET, NULL, 0);
	pcm20_stereo(dev, 1);

	return aci_rw_cmd(ACI_WRITE_TUNE, freql, freqh);
}

static int pcm20_getflags(struct pcm20_device *dev, __u32 *flags, __u16 *signal)
{
	/* okay, check for signal, stereo and rds here... */
	int i;
	unsigned char buf;

	if ((i=aci_rw_cmd(ACI_READ_TUNERSTATION, -1, -1))<0)
		return i;
	pr_debug("check_sig: 0x%x\n", i);
	if (i & 0x80) {
		/* no signal from tuner */
		*flags=0;
		*signal=0;
		return 0;
	} else
		*signal=0xffff;

	if ((i=aci_rw_cmd(ACI_READ_TUNERSTEREO, -1, -1))<0)
		return i;
	if (i & 0x40) {
		*flags=0;
	} else {
		/* stereo */
		*flags=VIDEO_TUNER_STEREO_ON;
		/* I can't see stereo, when forced to mono */
		dev->stereo=1;
	}

	if ((i=aci_rds_cmd(RDS_STATUS, &buf, 1))<0)
		return i;
	if (buf & 1)
		/* RDS available */
		*flags|=VIDEO_TUNER_RDS_ON;
	else
		return 0;

	if ((i=aci_rds_cmd(RDS_RXVALUE, &buf, 1))<0)
		return i;
	pr_debug("rds-signal: %d\n", buf);
	if (buf > 15) {
		printk("miropcm20-radio: RX strengths unexpected high...\n");
		buf=15;
	}
	/* refine signal */
	if ((*signal=SCALE(15, 0xffff, buf))==0)
		*signal = 1;

	return 0;
}

static int pcm20_do_ioctl(struct inode *inode, struct file *file,
			  unsigned int cmd, void *arg)
{
	struct video_device *dev = video_devdata(file);
	struct pcm20_device *pcm20 = dev->priv;
	int i;
	
	switch(cmd)
	{
		case VIDIOCGCAP:
		{
			struct video_capability *v = arg;
			memset(v,0,sizeof(*v));
			v->type=VID_TYPE_TUNER;
			strcpy(v->name, "Miro PCM20");
			v->channels=1;
			v->audios=1;
			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;
			pcm20_getflags(pcm20, &v->flags, &v->signal);
			v->flags|=VIDEO_TUNER_LOW;
			v->mode=VIDEO_MODE_AUTO;
			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 = pcm20->freq;
			return 0;
		}
		case VIDIOCSFREQ:
		{
			unsigned long *freq = arg;
			pcm20->freq = *freq;
			i=pcm20_setfreq(pcm20, pcm20->freq);
			pr_debug("First view (setfreq): 0x%x\n", i);
			return i;
		}
		case VIDIOCGAUDIO:
		{	
			struct video_audio *v = arg;
			memset(v,0, sizeof(*v));
			v->flags=VIDEO_AUDIO_MUTABLE;
			if (pcm20->muted)
				v->flags|=VIDEO_AUDIO_MUTE;
			v->mode=VIDEO_SOUND_STEREO;
			if (pcm20->stereo)
				v->mode|=VIDEO_SOUND_MONO;
			/* v->step=2048; */
			strcpy(v->name, "Radio");
			return 0;			
		}
		case VIDIOCSAUDIO:
		{
			struct video_audio *v = arg;
			if(v->audio) 
				return -EINVAL;

			pcm20_mute(pcm20, !!(v->flags&VIDEO_AUDIO_MUTE));
			if(v->flags&VIDEO_SOUND_MONO)
				pcm20_stereo(pcm20, 0);
			if(v->flags&VIDEO_SOUND_STEREO)
				pcm20_stereo(pcm20, 1);

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

static int pcm20_ioctl(struct inode *inode, struct file *file,
		       unsigned int cmd, unsigned long arg)
{
	return video_usercopy(inode, file, cmd, arg, pcm20_do_ioctl);
}

static struct pcm20_device pcm20_unit = {
	.freq   = 87*16000,
	.muted  = 1,
};

static struct file_operations pcm20_fops = {
	.owner		= THIS_MODULE,
	.open           = video_exclusive_open,
	.release        = video_exclusive_release,
	.ioctl		= pcm20_ioctl,
	.llseek         = no_llseek,
};

static struct video_device pcm20_radio = {
	.owner		= THIS_MODULE,
	.name		= "Miro PCM 20 radio",
	.type		= VID_TYPE_TUNER,
	.hardware	= VID_HARDWARE_RTRACK,
	.fops           = &pcm20_fops,
	.priv		= &pcm20_unit
};

static int __init pcm20_init(void)
{
	if(video_register_device(&pcm20_radio, VFL_TYPE_RADIO, radio_nr)==-1)
		goto video_register_device;
		
	if(attach_aci_rds()<0)
		goto attach_aci_rds;

	printk(KERN_INFO "Miro PCM20 radio card driver.\n");

	return 0;

 attach_aci_rds:
	video_unregister_device(&pcm20_radio);
 video_register_device:
	return -EINVAL;
}

MODULE_AUTHOR("Ruurd Reitsma");
MODULE_DESCRIPTION("A driver for the Miro PCM20 radio card.");
MODULE_LICENSE("GPL");

static void __exit pcm20_cleanup(void)
{
	unload_aci_rds();
	video_unregister_device(&pcm20_radio);
}

module_init(pcm20_init);
module_exit(pcm20_cleanup);
OpenPOWER on IntegriCloud