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[/] [test_project/] [trunk/] [linux_sd_driver/] [drivers/] [media/] [radio/] [miropcm20-radio.c] - Blame information for rev 62

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Line No. Rev Author Line
1 62 marcus.erl 
/* 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>
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 *   2000-09-05  Robert Siemer <Robert.Siemer@gmx.de>
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 *        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>
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#include <linux/videodev.h>
25 
#include <media/v4l2-common.h>
26 
#include "oss/aci.h"
27 
#include "miropcm20-rds-core.h"
28 
 
29 
static int radio_nr = -1;
30 
module_param(radio_nr, int, 0);
31 
 
32 
struct pcm20_device {
33 
        unsigned long freq;
34 
        int muted;
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        int stereo;
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};
37 
 
38 
 
39 
static int pcm20_mute(struct pcm20_device *dev, unsigned char mute)
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{
41 
        dev->muted = mute;
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        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, NULL, 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 
        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 
 
121 
static 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 
 
208 
static 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 
 
214 
static struct pcm20_device pcm20_unit = {
215 
        .freq   = 87*16000,
216 
        .muted  = 1,
217 
};
218 
 
219 
static 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 
 
228 
static struct video_device pcm20_radio = {
229 
        .owner          = THIS_MODULE,
230 
        .name           = "Miro PCM 20 radio",
231 
        .type           = VID_TYPE_TUNER,
232 
        .fops           = &pcm20_fops,
233 
        .priv           = &pcm20_unit
234 
};
235 
 
236 
static int __init pcm20_init(void)
237 
{
238 
        if(video_register_device(&pcm20_radio, VFL_TYPE_RADIO, radio_nr)==-1)
239 
                goto video_register_device;
240 
 
241 
        if(attach_aci_rds()<0)
242 
                goto attach_aci_rds;
243 
 
244 
        printk(KERN_INFO "Miro PCM20 radio card driver.\n");
245 
 
246 
        return 0;
247 
 
248 
 attach_aci_rds:
249 
        video_unregister_device(&pcm20_radio);
250 
 video_register_device:
251 
        return -EINVAL;
252 
}
253 
 
254 
MODULE_AUTHOR("Ruurd Reitsma");
255 
MODULE_DESCRIPTION("A driver for the Miro PCM20 radio card.");
256 
MODULE_LICENSE("GPL");
257 
 
258 
static void __exit pcm20_cleanup(void)
259 
{
260 
        unload_aci_rds();
261 
        video_unregister_device(&pcm20_radio);
262 
}
263 
 
264 
module_init(pcm20_init);
265 
module_exit(pcm20_cleanup);

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