drivers/media/radio/radio-miropcm20.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 provided by the snd-miro
   6  * ALSA driver.
   7  * Look there for further info...
   8  */
   9
  10 /* What ever you think about the ACI, version 0x07 is not very well!
  11  * I can't get frequency, 'tuner status', 'tuner flags' or mute/mono
  12  * conditions...                Robert
  13  */
  14
  15 #include <linux/module.h>
  16 #include <linux/init.h>
  17 #include <linux/videodev2.h>
  18 #include <media/v4l2-device.h>
  19 #include <media/v4l2-ioctl.h>
  20 #include <sound/aci.h>
  21
  22 static int radio_nr = -1;
  23 module_param(radio_nr, int, 0);
  24 MODULE_PARM_DESC(radio_nr, "Set radio device number (/dev/radioX).  Default: -1 (autodetect)");
  25
  26 static int mono;
  27 module_param(mono, bool, 0);
  28 MODULE_PARM_DESC(mono, "Force tuner into mono mode.");
  29
  30 struct pcm20 {
  31         struct v4l2_device v4l2_dev;
  32         struct video_device vdev;
  33         unsigned long freq;
  34         int muted;
  35         struct snd_miro_aci *aci;
  36 };
  37
  38 static struct pcm20 pcm20_card = {
  39         .freq   = 87*16000,
  40         .muted  = 1,
  41 };
  42
  43 static int pcm20_mute(struct pcm20 *dev, unsigned char mute)
  44 {
  45         dev->muted = mute;
  46         return snd_aci_cmd(dev->aci, ACI_SET_TUNERMUTE, mute, -1);
  47 }
  48
  49 static int pcm20_stereo(struct pcm20 *dev, unsigned char stereo)
  50 {
  51         return snd_aci_cmd(dev->aci, ACI_SET_TUNERMONO, !stereo, -1);
  52 }
  53
  54 static int pcm20_setfreq(struct pcm20 *dev, unsigned long freq)
  55 {
  56         unsigned char freql;
  57         unsigned char freqh;
  58         struct snd_miro_aci *aci = dev->aci;
  59
  60         dev->freq = freq;
  61
  62         freq /= 160;
  63         if (!(aci->aci_version == 0x07 || aci->aci_version >= 0xb0))
  64                 freq /= 10;  /* I don't know exactly which version
  65                               * needs this hack */
  66         freql = freq & 0xff;
  67         freqh = freq >> 8;
  68
  69         pcm20_stereo(dev, !mono);
  70         return snd_aci_cmd(aci, ACI_WRITE_TUNE, freql, freqh);
  71 }
  72
  73 static const struct v4l2_file_operations pcm20_fops = {
  74         .owner          = THIS_MODULE,
  75         .ioctl          = video_ioctl2,
  76 };
  77
  78 static int vidioc_querycap(struct file *file, void *priv,
  79                                 struct v4l2_capability *v)
  80 {
  81         strlcpy(v->driver, "Miro PCM20", sizeof(v->driver));
  82         strlcpy(v->card, "Miro PCM20", sizeof(v->card));
  83         strlcpy(v->bus_info, "ISA", sizeof(v->bus_info));
  84         v->version = 0x1;
  85         v->capabilities = V4L2_CAP_TUNER | V4L2_CAP_RADIO;
  86         return 0;
  87 }
  88
  89 static int vidioc_g_tuner(struct file *file, void *priv,
  90                                 struct v4l2_tuner *v)
  91 {
  92         if (v->index)   /* Only 1 tuner */
  93                 return -EINVAL;
  94         strlcpy(v->name, "FM", sizeof(v->name));
  95         v->type = V4L2_TUNER_RADIO;
  96         v->rangelow = 87*16000;
  97         v->rangehigh = 108*16000;
  98         v->signal = 0xffff;
  99         v->rxsubchans = V4L2_TUNER_SUB_MONO | V4L2_TUNER_SUB_STEREO;
 100         v->capability = V4L2_TUNER_CAP_LOW;
 101         v->audmode = V4L2_TUNER_MODE_MONO;
 102         return 0;
 103 }
 104
 105 static int vidioc_s_tuner(struct file *file, void *priv,
 106                                 struct v4l2_tuner *v)
 107 {
 108         return v->index ? -EINVAL : 0;
 109 }
 110
 111 static int vidioc_g_frequency(struct file *file, void *priv,
 112                                 struct v4l2_frequency *f)
 113 {
 114         struct pcm20 *dev = video_drvdata(file);
 115
 116         if (f->tuner != 0)
 117                 return -EINVAL;
 118
 119         f->type = V4L2_TUNER_RADIO;
 120         f->frequency = dev->freq;
 121         return 0;
 122 }
 123
 124
 125 static int vidioc_s_frequency(struct file *file, void *priv,
 126                                 struct v4l2_frequency *f)
 127 {
 128         struct pcm20 *dev = video_drvdata(file);
 129
 130         if (f->tuner != 0 || f->type != V4L2_TUNER_RADIO)
 131                 return -EINVAL;
 132
 133         dev->freq = f->frequency;
 134         pcm20_setfreq(dev, f->frequency);
 135         return 0;
 136 }
 137
 138 static int vidioc_queryctrl(struct file *file, void *priv,
 139                                 struct v4l2_queryctrl *qc)
 140 {
 141         switch (qc->id) {
 142         case V4L2_CID_AUDIO_MUTE:
 143                 return v4l2_ctrl_query_fill(qc, 0, 1, 1, 1);
 144         }
 145         return -EINVAL;
 146 }
 147
 148 static int vidioc_g_ctrl(struct file *file, void *priv,
 149                                 struct v4l2_control *ctrl)
 150 {
 151         struct pcm20 *dev = video_drvdata(file);
 152
 153         switch (ctrl->id) {
 154         case V4L2_CID_AUDIO_MUTE:
 155                 ctrl->value = dev->muted;
 156                 break;
 157         default:
 158                 return -EINVAL;
 159         }
 160         return 0;
 161 }
 162
 163 static int vidioc_s_ctrl(struct file *file, void *priv,
 164                                 struct v4l2_control *ctrl)
 165 {
 166         struct pcm20 *dev = video_drvdata(file);
 167
 168         switch (ctrl->id) {
 169         case V4L2_CID_AUDIO_MUTE:
 170                 pcm20_mute(dev, ctrl->value);
 171                 break;
 172         default:
 173                 return -EINVAL;
 174         }
 175         return 0;
 176 }
 177
 178 static int vidioc_g_input(struct file *filp, void *priv, unsigned int *i)
 179 {
 180         *i = 0;
 181         return 0;
 182 }
 183
 184 static int vidioc_s_input(struct file *filp, void *priv, unsigned int i)
 185 {
 186         return i ? -EINVAL : 0;
 187 }
 188
 189 static int vidioc_g_audio(struct file *file, void *priv,
 190                                 struct v4l2_audio *a)
 191 {
 192         a->index = 0;
 193         strlcpy(a->name, "Radio", sizeof(a->name));
 194         a->capability = V4L2_AUDCAP_STEREO;
 195         return 0;
 196 }
 197
 198 static int vidioc_s_audio(struct file *file, void *priv,
 199                                 struct v4l2_audio *a)
 200 {
 201         return a->index ? -EINVAL : 0;
 202 }
 203
 204 static const struct v4l2_ioctl_ops pcm20_ioctl_ops = {
 205         .vidioc_querycap    = vidioc_querycap,
 206         .vidioc_g_tuner     = vidioc_g_tuner,
 207         .vidioc_s_tuner     = vidioc_s_tuner,
 208         .vidioc_g_frequency = vidioc_g_frequency,
 209         .vidioc_s_frequency = vidioc_s_frequency,
 210         .vidioc_queryctrl   = vidioc_queryctrl,
 211         .vidioc_g_ctrl      = vidioc_g_ctrl,
 212         .vidioc_s_ctrl      = vidioc_s_ctrl,
 213         .vidioc_g_audio     = vidioc_g_audio,
 214         .vidioc_s_audio     = vidioc_s_audio,
 215         .vidioc_g_input     = vidioc_g_input,
 216         .vidioc_s_input     = vidioc_s_input,
 217 };
 218
 219 static int __init pcm20_init(void)
 220 {
 221         struct pcm20 *dev = &pcm20_card;
 222         struct v4l2_device *v4l2_dev = &dev->v4l2_dev;
 223         int res;
 224
 225         dev->aci = snd_aci_get_aci();
 226         if (dev->aci == NULL) {
 227                 v4l2_err(v4l2_dev,
 228                          "you must load the snd-miro driver first!\n");
 229                 return -ENODEV;
 230         }
 231         strlcpy(v4l2_dev->name, "miropcm20", sizeof(v4l2_dev->name));
 232
 233
 234         res = v4l2_device_register(NULL, v4l2_dev);
 235         if (res < 0) {
 236                 v4l2_err(v4l2_dev, "could not register v4l2_device\n");
 237                 return -EINVAL;
 238         }
 239
 240         strlcpy(dev->vdev.name, v4l2_dev->name, sizeof(dev->vdev.name));
 241         dev->vdev.v4l2_dev = v4l2_dev;
 242         dev->vdev.fops = &pcm20_fops;
 243         dev->vdev.ioctl_ops = &pcm20_ioctl_ops;
 244         dev->vdev.release = video_device_release_empty;
 245         video_set_drvdata(&dev->vdev, dev);
 246
 247         if (video_register_device(&dev->vdev, VFL_TYPE_RADIO, radio_nr) < 0)
 248                 goto fail;
 249
 250         v4l2_info(v4l2_dev, "Mirosound PCM20 Radio tuner\n");
 251         return 0;
 252 fail:
 253         v4l2_device_unregister(v4l2_dev);
 254         return -EINVAL;
 255 }
 256
 257 MODULE_AUTHOR("Ruurd Reitsma, Krzysztof Helt");
 258 MODULE_DESCRIPTION("A driver for the Miro PCM20 radio card.");
 259 MODULE_LICENSE("GPL");
 260
 261 static void __exit pcm20_cleanup(void)
 262 {
 263         struct pcm20 *dev = &pcm20_card;
 264
 265         video_unregister_device(&dev->vdev);
 266         v4l2_device_unregister(&dev->v4l2_dev);
 267 }
 268
 269 module_init(pcm20_init);
 270 module_exit(pcm20_cleanup);