tjh.dev
Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
kernel
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linux
1/* Miro PCM20 radio driver for Linux radio support
2 * (c) 1998 Ruurd Reitsma <R.A.Reitsma@wbmt.tudelft.nl>
3 * Thanks to Norberto Pellici for the ACI device interface specification
4 * The API part is based on the radiotrack driver by M. Kirkwood
5 * This driver relies on the aci mixer (drivers/sound/aci.c)
6 * Look there for further info...
7 */
8
9/* Revision history:
10 *
11 * 1998 Ruurd Reitsma <R.A.Reitsma@wbmt.tudelft.nl>
12 * 2000-09-05 Robert Siemer <Robert.Siemer@gmx.de>
13 * removed unfinished volume control (maybe adding it later again)
14 * use OSS-mixer; added stereo control
15 */
16
17/* What ever you think about the ACI, version 0x07 is not very well!
18 * I can't get frequency, 'tuner status', 'tuner flags' or mute/mono
19 * conditions... Robert
20 */
21
22#include <linux/module.h>
23#include <linux/init.h>
24#include <linux/videodev.h>
25#include <media/v4l2-common.h>
26#include "oss/aci.h"
27#include "miropcm20-rds-core.h"
28
29static int radio_nr = -1;
30module_param(radio_nr, int, 0);
31
32struct pcm20_device {
33 unsigned long freq;
34 int muted;
35 int stereo;
36};
37
38
39static int pcm20_mute(struct pcm20_device *dev, unsigned char mute)
40{
41 dev->muted = mute;
42 return aci_write_cmd(ACI_SET_TUNERMUTE, mute);
43}
44
45static int pcm20_stereo(struct pcm20_device *dev, unsigned char stereo)
46{
47 dev->stereo = stereo;
48 return aci_write_cmd(ACI_SET_TUNERMONO, !stereo);
49}
50
51static int pcm20_setfreq(struct pcm20_device *dev, unsigned long freq)
52{
53 unsigned char freql;
54 unsigned char freqh;
55
56 dev->freq=freq;
57
58 freq /= 160;
59 if (!(aci_version==0x07 || aci_version>=0xb0))
60 freq /= 10; /* I don't know exactly which version
61 * needs this hack */
62 freql = freq & 0xff;
63 freqh = freq >> 8;
64
65 aci_rds_cmd(RDS_RESET, NULL, 0);
66 pcm20_stereo(dev, 1);
67
68 return aci_rw_cmd(ACI_WRITE_TUNE, freql, freqh);
69}
70
71static int pcm20_getflags(struct pcm20_device *dev, __u32 *flags, __u16 *signal)
72{
73 /* okay, check for signal, stereo and rds here... */
74 int i;
75 unsigned char buf;
76
77 if ((i=aci_rw_cmd(ACI_READ_TUNERSTATION, -1, -1))<0)
78 return i;
79 pr_debug("check_sig: 0x%x\n", i);
80 if (i & 0x80) {
81 /* no signal from tuner */
82 *flags=0;
83 *signal=0;
84 return 0;
85 } else
86 *signal=0xffff;
87
88 if ((i=aci_rw_cmd(ACI_READ_TUNERSTEREO, -1, -1))<0)
89 return i;
90 if (i & 0x40) {
91 *flags=0;
92 } else {
93 /* stereo */
94 *flags=VIDEO_TUNER_STEREO_ON;
95 /* I can't see stereo, when forced to mono */
96 dev->stereo=1;
97 }
98
99 if ((i=aci_rds_cmd(RDS_STATUS, &buf, 1))<0)
100 return i;
101 if (buf & 1)
102 /* RDS available */
103 *flags|=VIDEO_TUNER_RDS_ON;
104 else
105 return 0;
106
107 if ((i=aci_rds_cmd(RDS_RXVALUE, &buf, 1))<0)
108 return i;
109 pr_debug("rds-signal: %d\n", buf);
110 if (buf > 15) {
111 printk("miropcm20-radio: RX strengths unexpected high...\n");
112 buf=15;
113 }
114 /* refine signal */
115 if ((*signal=SCALE(15, 0xffff, buf))==0)
116 *signal = 1;
117
118 return 0;
119}
120
121static int pcm20_do_ioctl(struct inode *inode, struct file *file,
122 unsigned int cmd, void *arg)
123{
124 struct video_device *dev = video_devdata(file);
125 struct pcm20_device *pcm20 = dev->priv;
126 int i;
127
128 switch(cmd)
129 {
130 case VIDIOCGCAP:
131 {
132 struct video_capability *v = arg;
133 memset(v,0,sizeof(*v));
134 v->type=VID_TYPE_TUNER;
135 strcpy(v->name, "Miro PCM20");
136 v->channels=1;
137 v->audios=1;
138 return 0;
139 }
140 case VIDIOCGTUNER:
141 {
142 struct video_tuner *v = arg;
143 if(v->tuner) /* Only 1 tuner */
144 return -EINVAL;
145 v->rangelow=87*16000;
146 v->rangehigh=108*16000;
147 pcm20_getflags(pcm20, &v->flags, &v->signal);
148 v->flags|=VIDEO_TUNER_LOW;
149 v->mode=VIDEO_MODE_AUTO;
150 strcpy(v->name, "FM");
151 return 0;
152 }
153 case VIDIOCSTUNER:
154 {
155 struct video_tuner *v = arg;
156 if(v->tuner!=0)
157 return -EINVAL;
158 /* Only 1 tuner so no setting needed ! */
159 return 0;
160 }
161 case VIDIOCGFREQ:
162 {
163 unsigned long *freq = arg;
164 *freq = pcm20->freq;
165 return 0;
166 }
167 case VIDIOCSFREQ:
168 {
169 unsigned long *freq = arg;
170 pcm20->freq = *freq;
171 i=pcm20_setfreq(pcm20, pcm20->freq);
172 pr_debug("First view (setfreq): 0x%x\n", i);
173 return i;
174 }
175 case VIDIOCGAUDIO:
176 {
177 struct video_audio *v = arg;
178 memset(v,0, sizeof(*v));
179 v->flags=VIDEO_AUDIO_MUTABLE;
180 if (pcm20->muted)
181 v->flags|=VIDEO_AUDIO_MUTE;
182 v->mode=VIDEO_SOUND_STEREO;
183 if (pcm20->stereo)
184 v->mode|=VIDEO_SOUND_MONO;
185 /* v->step=2048; */
186 strcpy(v->name, "Radio");
187 return 0;
188 }
189 case VIDIOCSAUDIO:
190 {
191 struct video_audio *v = arg;
192 if(v->audio)
193 return -EINVAL;
194
195 pcm20_mute(pcm20, !!(v->flags&VIDEO_AUDIO_MUTE));
196 if(v->flags&VIDEO_SOUND_MONO)
197 pcm20_stereo(pcm20, 0);
198 if(v->flags&VIDEO_SOUND_STEREO)
199 pcm20_stereo(pcm20, 1);
200
201 return 0;
202 }
203 default:
204 return -ENOIOCTLCMD;
205 }
206}
207
208static int pcm20_ioctl(struct inode *inode, struct file *file,
209 unsigned int cmd, unsigned long arg)
210{
211 return video_usercopy(inode, file, cmd, arg, pcm20_do_ioctl);
212}
213
214static struct pcm20_device pcm20_unit = {
215 .freq = 87*16000,
216 .muted = 1,
217};
218
219static const struct file_operations pcm20_fops = {
220 .owner = THIS_MODULE,
221 .open = video_exclusive_open,
222 .release = video_exclusive_release,
223 .ioctl = pcm20_ioctl,
224 .compat_ioctl = v4l_compat_ioctl32,
225 .llseek = no_llseek,
226};
227
228static struct video_device pcm20_radio = {
229 .owner = THIS_MODULE,
230 .name = "Miro PCM 20 radio",
231 .type = VID_TYPE_TUNER,
232 .hardware = VID_HARDWARE_RTRACK,
233 .fops = &pcm20_fops,
234 .priv = &pcm20_unit
235};
236
237static int __init pcm20_init(void)
238{
239 if(video_register_device(&pcm20_radio, VFL_TYPE_RADIO, radio_nr)==-1)
240 goto video_register_device;
241
242 if(attach_aci_rds()<0)
243 goto attach_aci_rds;
244
245 printk(KERN_INFO "Miro PCM20 radio card driver.\n");
246
247 return 0;
248
249 attach_aci_rds:
250 video_unregister_device(&pcm20_radio);
251 video_register_device:
252 return -EINVAL;
253}
254
255MODULE_AUTHOR("Ruurd Reitsma");
256MODULE_DESCRIPTION("A driver for the Miro PCM20 radio card.");
257MODULE_LICENSE("GPL");
258
259static void __exit pcm20_cleanup(void)
260{
261 unload_aci_rds();
262 video_unregister_device(&pcm20_radio);
263}
264
265module_init(pcm20_init);
266module_exit(pcm20_cleanup);