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 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 <media/v4l2-ioctl.h>
  27 #include "oss/aci.h"
  28 #include "miropcm20-rds-core.h"
  29
  30 static int radio_nr = -1;
  31 module_param(radio_nr, int, 0);
  32
  33 struct pcm20_device {
  34         unsigned long freq;
  35         int muted;
  36         int stereo;
  37 };
  38
  39
  40 static int pcm20_mute(struct pcm20_device *dev, unsigned char mute)
  41 {
  42         dev->muted = mute;
  43         return aci_write_cmd(ACI_SET_TUNERMUTE, mute);
  44 }
  45
  46 static int pcm20_stereo(struct pcm20_device *dev, unsigned char stereo)
  47 {
  48         dev->stereo = stereo;
  49         return aci_write_cmd(ACI_SET_TUNERMONO, !stereo);
  50 }
  51
  52 static int pcm20_setfreq(struct pcm20_device *dev, unsigned long freq)
  53 {
  54         unsigned char freql;
  55         unsigned char freqh;
  56
  57         dev->freq=freq;
  58
  59         freq /= 160;
  60         if (!(aci_version==0x07 || aci_version>=0xb0))
  61                 freq /= 10;  /* I don't know exactly which version
  62                               * needs this hack */
  63         freql = freq & 0xff;
  64         freqh = freq >> 8;
  65
  66         aci_rds_cmd(RDS_RESET, NULL, 0);
  67         pcm20_stereo(dev, 1);
  68
  69         return aci_rw_cmd(ACI_WRITE_TUNE, freql, freqh);
  70 }
  71
  72 static int pcm20_getflags(struct pcm20_device *dev, __u32 *flags, __u16 *signal)
  73 {
  74         /* okay, check for signal, stereo and rds here... */
  75         int i;
  76         unsigned char buf;
  77
  78         if ((i=aci_rw_cmd(ACI_READ_TUNERSTATION, -1, -1))<0)
  79                 return i;
  80         pr_debug("check_sig: 0x%x\n", i);
  81         if (i & 0x80) {
  82                 /* no signal from tuner */
  83                 *flags=0;
  84                 *signal=0;
  85                 return 0;
  86         } else
  87                 *signal=0xffff;
  88
  89         if ((i=aci_rw_cmd(ACI_READ_TUNERSTEREO, -1, -1))<0)
  90                 return i;
  91         if (i & 0x40) {
  92                 *flags=0;
  93         } else {
  94                 /* stereo */
  95                 *flags=VIDEO_TUNER_STEREO_ON;
  96                 /* I can't see stereo, when forced to mono */
  97                 dev->stereo=1;
  98         }
  99
 100         if ((i=aci_rds_cmd(RDS_STATUS, &buf, 1))<0)
 101                 return i;
 102         if (buf & 1)
 103                 /* RDS available */
 104                 *flags|=VIDEO_TUNER_RDS_ON;
 105         else
 106                 return 0;
 107
 108         if ((i=aci_rds_cmd(RDS_RXVALUE, &buf, 1))<0)
 109                 return i;
 110         pr_debug("rds-signal: %d\n", buf);
 111         if (buf > 15) {
 112                 printk("miropcm20-radio: RX strengths unexpected high...\n");
 113                 buf=15;
 114         }
 115         /* refine signal */
 116         if ((*signal=SCALE(15, 0xffff, buf))==0)
 117                 *signal = 1;
 118
 119         return 0;
 120 }
 121
 122 static int pcm20_do_ioctl(struct inode *inode, struct file *file,
 123                           unsigned int cmd, void *arg)
 124 {
 125         struct video_device *dev = video_devdata(file);
 126         struct pcm20_device *pcm20 = dev->priv;
 127         int i;
 128
 129         switch(cmd)
 130         {
 131                 case VIDIOCGCAP:
 132                 {
 133                         struct video_capability *v = arg;
 134                         memset(v,0,sizeof(*v));
 135                         v->type=VID_TYPE_TUNER;
 136                         strcpy(v->name, "Miro PCM20");
 137                         v->channels=1;
 138                         v->audios=1;
 139                         return 0;
 140                 }
 141                 case VIDIOCGTUNER:
 142                 {
 143                         struct video_tuner *v = arg;
 144                         if(v->tuner)    /* Only 1 tuner */
 145                                 return -EINVAL;
 146                         v->rangelow=87*16000;
 147                         v->rangehigh=108*16000;
 148                         pcm20_getflags(pcm20, &v->flags, &v->signal);
 149                         v->flags|=VIDEO_TUNER_LOW;
 150                         v->mode=VIDEO_MODE_AUTO;
 151                         strcpy(v->name, "FM");
 152                         return 0;
 153                 }
 154                 case VIDIOCSTUNER:
 155                 {
 156                         struct video_tuner *v = arg;
 157                         if(v->tuner!=0)
 158                                 return -EINVAL;
 159                         /* Only 1 tuner so no setting needed ! */
 160                         return 0;
 161                 }
 162                 case VIDIOCGFREQ:
 163                 {
 164                         unsigned long *freq = arg;
 165                         *freq = pcm20->freq;
 166                         return 0;
 167                 }
 168                 case VIDIOCSFREQ:
 169                 {
 170                         unsigned long *freq = arg;
 171                         pcm20->freq = *freq;
 172                         i=pcm20_setfreq(pcm20, pcm20->freq);
 173                         pr_debug("First view (setfreq): 0x%x\n", i);
 174                         return i;
 175                 }
 176                 case VIDIOCGAUDIO:
 177                 {
 178                         struct video_audio *v = arg;
 179                         memset(v,0, sizeof(*v));
 180                         v->flags=VIDEO_AUDIO_MUTABLE;
 181                         if (pcm20->muted)
 182                                 v->flags|=VIDEO_AUDIO_MUTE;
 183                         v->mode=VIDEO_SOUND_STEREO;
 184                         if (pcm20->stereo)
 185                                 v->mode|=VIDEO_SOUND_MONO;
 186                         /* v->step=2048; */
 187                         strcpy(v->name, "Radio");
 188                         return 0;
 189                 }
 190                 case VIDIOCSAUDIO:
 191                 {
 192                         struct video_audio *v = arg;
 193                         if(v->audio)
 194                                 return -EINVAL;
 195
 196                         pcm20_mute(pcm20, !!(v->flags&VIDEO_AUDIO_MUTE));
 197                         if(v->flags&VIDEO_SOUND_MONO)
 198                                 pcm20_stereo(pcm20, 0);
 199                         if(v->flags&VIDEO_SOUND_STEREO)
 200                                 pcm20_stereo(pcm20, 1);
 201
 202                         return 0;
 203                 }
 204                 default:
 205                         return -ENOIOCTLCMD;
 206         }
 207 }
 208
 209 static int pcm20_ioctl(struct inode *inode, struct file *file,
 210                        unsigned int cmd, unsigned long arg)
 211 {
 212         return video_usercopy(inode, file, cmd, arg, pcm20_do_ioctl);
 213 }
 214
 215 static struct pcm20_device pcm20_unit = {
 216         .freq   = 87*16000,
 217         .muted  = 1,
 218 };
 219
 220 static const struct file_operations pcm20_fops = {
 221         .owner          = THIS_MODULE,
 222         .open           = video_exclusive_open,
 223         .release        = video_exclusive_release,
 224         .ioctl          = pcm20_ioctl,
 225 #ifdef CONFIG_COMPAT
 226         .compat_ioctl   = v4l_compat_ioctl32,
 227 #endif
 228         .llseek         = no_llseek,
 229 };
 230
 231 static struct video_device pcm20_radio = {
 232         .name           = "Miro PCM 20 radio",
 233         .fops           = &pcm20_fops,
 234         .priv           = &pcm20_unit
 235 };
 236
 237 static 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
 255 MODULE_AUTHOR("Ruurd Reitsma");
 256 MODULE_DESCRIPTION("A driver for the Miro PCM20 radio card.");
 257 MODULE_LICENSE("GPL");
 258
 259 static void __exit pcm20_cleanup(void)
 260 {
 261         unload_aci_rds();
 262         video_unregister_device(&pcm20_radio);
 263 }
 264
 265 module_init(pcm20_init);
 266 module_exit(pcm20_cleanup);