File: /usr/src/linux/drivers/media/radio/miropcm20-radio.c
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 cant 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 "../../sound/aci.h"
26 #include "miropcm20-rds-core.h"
27
28 static int users = 0;
29 static int radio_nr = -1;
30 MODULE_PARM(radio_nr, "i");
31
32 struct pcm20_device {
33 unsigned long freq;
34 int muted;
35 int stereo;
36 };
37
38
39 static 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
45 static 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
51 static 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, 0, 0);
66 pcm20_stereo(dev, 1);
67
68 return aci_rw_cmd(ACI_WRITE_TUNE, freql, freqh);
69 }
70
71 static 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 #if DEBUG
80 printk("check_sig: 0x%x\n", i);
81 #endif
82 if (i & 0x80) {
83 /* no signal from tuner */
84 *flags=0;
85 *signal=0;
86 return 0;
87 } else
88 *signal=0xffff;
89
90 if ((i=aci_rw_cmd(ACI_READ_TUNERSTEREO, -1, -1))<0)
91 return i;
92 if (i & 0x40) {
93 *flags=0;
94 } else {
95 /* stereo */
96 *flags=VIDEO_TUNER_STEREO_ON;
97 /* I cant see stereo, when forced to mono */
98 dev->stereo=1;
99 }
100
101 if ((i=aci_rds_cmd(RDS_STATUS, &buf, 1))<0)
102 return i;
103 if (buf & 1)
104 /* RDS available */
105 *flags|=VIDEO_TUNER_RDS_ON;
106 else
107 return 0;
108
109 if ((i=aci_rds_cmd(RDS_RXVALUE, &buf, 1))<0)
110 return i;
111 #if DEBUG
112 printk("rds-signal: %d\n", buf);
113 #endif
114 if (buf > 15) {
115 printk("miropcm20-radio: RX strengths unexpected high...\n");
116 buf=15;
117 }
118 /* refine signal */
119 if ((*signal=SCALE(15, 0xffff, buf))==0)
120 *signal = 1;
121
122 return 0;
123 }
124
125 static int pcm20_ioctl(struct video_device *dev, unsigned int cmd, void *arg)
126 {
127 struct pcm20_device *pcm20=dev->priv;
128 int i;
129
130 switch(cmd)
131 {
132 case VIDIOCGCAP:
133 {
134 struct video_capability v;
135 v.type=VID_TYPE_TUNER;
136 strcpy(v.name, "Miro PCM20");
137 v.channels=1;
138 v.audios=1;
139 /* No we don't do pictures */
140 v.maxwidth=0;
141 v.maxheight=0;
142 v.minwidth=0;
143 v.minheight=0;
144 if(copy_to_user(arg,&v,sizeof(v)))
145 return -EFAULT;
146 return 0;
147 }
148 case VIDIOCGTUNER:
149 {
150 struct video_tuner v;
151 if(copy_from_user(&v, arg,sizeof(v))!=0)
152 return -EFAULT;
153 if(v.tuner) /* Only 1 tuner */
154 return -EINVAL;
155 v.rangelow=87*16000;
156 v.rangehigh=108*16000;
157 pcm20_getflags(pcm20, &v.flags, &v.signal);
158 v.flags|=VIDEO_TUNER_LOW;
159 v.mode=VIDEO_MODE_AUTO;
160 strcpy(v.name, "FM");
161 if(copy_to_user(arg,&v, sizeof(v)))
162 return -EFAULT;
163 return 0;
164 }
165 case VIDIOCSTUNER:
166 {
167 struct video_tuner v;
168 if(copy_from_user(&v, arg, sizeof(v)))
169 return -EFAULT;
170 if(v.tuner!=0)
171 return -EINVAL;
172 /* Only 1 tuner so no setting needed ! */
173 return 0;
174 }
175 case VIDIOCGFREQ:
176 if(copy_to_user(arg, &pcm20->freq, sizeof(pcm20->freq)))
177 return -EFAULT;
178 return 0;
179 case VIDIOCSFREQ:
180 if(copy_from_user(&pcm20->freq, arg, sizeof(pcm20->freq)))
181 return -EFAULT;
182 i=pcm20_setfreq(pcm20, pcm20->freq);
183 #if DEBUG
184 printk("First view (setfreq): 0x%x\n", i);
185 #endif
186 return i;
187 case VIDIOCGAUDIO:
188 {
189 struct video_audio v;
190 memset(&v,0, sizeof(v));
191 v.flags=VIDEO_AUDIO_MUTABLE;
192 if (pcm20->muted)
193 v.flags|=VIDEO_AUDIO_MUTE;
194 v.mode=VIDEO_SOUND_STEREO;
195 if (pcm20->stereo)
196 v.mode|=VIDEO_SOUND_MONO;
197 /* v.step=2048; */
198 strcpy(v.name, "Radio");
199 if(copy_to_user(arg,&v, sizeof(v)))
200 return -EFAULT;
201 return 0;
202 }
203 case VIDIOCSAUDIO:
204 {
205 struct video_audio v;
206 if(copy_from_user(&v, arg, sizeof(v)))
207 return -EFAULT;
208 if(v.audio)
209 return -EINVAL;
210
211 pcm20_mute(pcm20, !!(v.flags&VIDEO_AUDIO_MUTE));
212 if(v.flags&VIDEO_SOUND_MONO)
213 pcm20_stereo(pcm20, 0);
214 if(v.flags&VIDEO_SOUND_STEREO)
215 pcm20_stereo(pcm20, 1);
216
217 return 0;
218 }
219 default:
220 return -ENOIOCTLCMD;
221 }
222 }
223
224 static int pcm20_open(struct video_device *dev, int flags)
225 {
226 if(users)
227 return -EBUSY;
228 users++;
229 MOD_INC_USE_COUNT;
230 return 0;
231 }
232
233 static void pcm20_close(struct video_device *dev)
234 {
235 users--;
236 MOD_DEC_USE_COUNT;
237 }
238
239 static struct pcm20_device pcm20_unit = {
240 freq: 87*16000,
241 muted: 1,
242 stereo: 0
243 };
244
245 static struct video_device pcm20_radio = {
246 owner: THIS_MODULE,
247 name: "Miro PCM 20 radio",
248 type: VID_TYPE_TUNER,
249 hardware: VID_HARDWARE_RTRACK,
250 open: pcm20_open,
251 close: pcm20_close,
252 ioctl: pcm20_ioctl,
253 priv: &pcm20_unit
254 };
255
256 static int __init pcm20_init(void)
257 {
258 if(video_register_device(&pcm20_radio, VFL_TYPE_RADIO, radio_nr)==-1)
259 goto video_register_device;
260
261 if(attach_aci_rds()<0)
262 goto attach_aci_rds;
263
264 printk(KERN_INFO "Miro PCM20 radio card driver.\n");
265
266 return 0;
267
268 attach_aci_rds:
269 video_unregister_device(&pcm20_radio);
270 video_register_device:
271 return -EINVAL;
272 }
273
274 MODULE_AUTHOR("Ruurd Reitsma");
275 MODULE_DESCRIPTION("A driver for the Miro PCM20 radio card.");
276
277 EXPORT_NO_SYMBOLS;
278
279 static void __exit pcm20_cleanup(void)
280 {
281 unload_aci_rds();
282 video_unregister_device(&pcm20_radio);
283 }
284
285 module_init(pcm20_init);
286 module_exit(pcm20_cleanup);
287