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 "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;
  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, 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);