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