radio-miropcm20.c

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/* Miro PCM20 radio driver for Linux radio support
 * (c) 1998 Ruurd Reitsma <[email protected]>
 * Thanks to Norberto Pellici for the ACI device interface specification
 * The API part is based on the radiotrack driver by M. Kirkwood
 * This driver relies on the aci mixer provided by the snd-miro
 * ALSA driver.
 * Look there for further info...
 */

/* What ever you think about the ACI, version 0x07 is not very well!
 * I can't get frequency, 'tuner status', 'tuner flags' or mute/mono
 * conditions...                Robert
 */

#include <linux/module.h>
#include <linux/init.h>
#include <linux/videodev2.h>
#include <media/v4l2-device.h>
#include <media/v4l2-ioctl.h>
#include <sound/aci.h>

static int radio_nr = -1;
module_param(radio_nr, int, 0);
MODULE_PARM_DESC(radio_nr, "Set radio device number (/dev/radioX).  Default: -1 (autodetect)");

static bool mono;
module_param(mono, bool, 0);
MODULE_PARM_DESC(mono, "Force tuner into mono mode.");

struct pcm20 {
    struct v4l2_device v4l2_dev;
    struct video_device vdev;
    unsigned long freq;
    int muted;
    struct snd_miro_aci *aci;
    struct mutex lock;
};

static struct pcm20 pcm20_card = {
    .freq   = 87*16000,
    .muted  = 1,
};

static int pcm20_mute(struct pcm20 *dev, unsigned char mute)
{
    dev->muted = mute;
    return snd_aci_cmd(dev->aci, ACI_SET_TUNERMUTE, mute, -1);
}

static int pcm20_stereo(struct pcm20 *dev, unsigned char stereo)
{
    return snd_aci_cmd(dev->aci, ACI_SET_TUNERMONO, !stereo, -1);
}

static int pcm20_setfreq(struct pcm20 *dev, unsigned long freq)
{
    unsigned char freql;
    unsigned char freqh;
    struct snd_miro_aci *aci = dev->aci;

    dev->freq = freq;

    freq /= 160;
    if (!(aci->aci_version == 0x07 || aci->aci_version >= 0xb0))
        freq /= 10;  /* I don't know exactly which version
                  * needs this hack */
    freql = freq & 0xff;
    freqh = freq >> 8;

    pcm20_stereo(dev, !mono);
    return snd_aci_cmd(aci, ACI_WRITE_TUNE, freql, freqh);
}

static const struct v4l2_file_operations pcm20_fops = {
    .owner      = THIS_MODULE,
    .unlocked_ioctl = video_ioctl2,
};

static int vidioc_querycap(struct file *file, void *priv,
                struct v4l2_capability *v)
{
    strlcpy(v->driver, "Miro PCM20", sizeof(v->driver));
    strlcpy(v->card, "Miro PCM20", sizeof(v->card));
    strlcpy(v->bus_info, "ISA", sizeof(v->bus_info));
    v->version = 0x1;
    v->capabilities = V4L2_CAP_TUNER | V4L2_CAP_RADIO;
    return 0;
}

static int vidioc_g_tuner(struct file *file, void *priv,
                struct v4l2_tuner *v)
{
    if (v->index)   /* Only 1 tuner */
        return -EINVAL;
    strlcpy(v->name, "FM", sizeof(v->name));
    v->type = V4L2_TUNER_RADIO;
    v->rangelow = 87*16000;
    v->rangehigh = 108*16000;
    v->signal = 0xffff;
    v->rxsubchans = V4L2_TUNER_SUB_MONO | V4L2_TUNER_SUB_STEREO;
    v->capability = V4L2_TUNER_CAP_LOW;
    v->audmode = V4L2_TUNER_MODE_MONO;
    return 0;
}

static int vidioc_s_tuner(struct file *file, void *priv,
                struct v4l2_tuner *v)
{
    return v->index ? -EINVAL : 0;
}

static int vidioc_g_frequency(struct file *file, void *priv,
                struct v4l2_frequency *f)
{
    struct pcm20 *dev = video_drvdata(file);

    if (f->tuner != 0)
        return -EINVAL;

    f->type = V4L2_TUNER_RADIO;
    f->frequency = dev->freq;
    return 0;
}


static int vidioc_s_frequency(struct file *file, void *priv,
                struct v4l2_frequency *f)
{
    struct pcm20 *dev = video_drvdata(file);

    if (f->tuner != 0 || f->type != V4L2_TUNER_RADIO)
        return -EINVAL;

    dev->freq = f->frequency;
    pcm20_setfreq(dev, f->frequency);
    return 0;
}

static int vidioc_queryctrl(struct file *file, void *priv,
                struct v4l2_queryctrl *qc)
{
    switch (qc->id) {
    case V4L2_CID_AUDIO_MUTE:
        return v4l2_ctrl_query_fill(qc, 0, 1, 1, 1);
    }
    return -EINVAL;
}

static int vidioc_g_ctrl(struct file *file, void *priv,
                struct v4l2_control *ctrl)
{
    struct pcm20 *dev = video_drvdata(file);

    switch (ctrl->id) {
    case V4L2_CID_AUDIO_MUTE:
        ctrl->value = dev->muted;
        break;
    default:
        return -EINVAL;
    }
    return 0;
}

static int vidioc_s_ctrl(struct file *file, void *priv,
                struct v4l2_control *ctrl)
{
    struct pcm20 *dev = video_drvdata(file);

    switch (ctrl->id) {
    case V4L2_CID_AUDIO_MUTE:
        pcm20_mute(dev, ctrl->value);
        break;
    default:
        return -EINVAL;
    }
    return 0;
}

static int vidioc_g_input(struct file *filp, void *priv, unsigned int *i)
{
    *i = 0;
    return 0;
}

static int vidioc_s_input(struct file *filp, void *priv, unsigned int i)
{
    return i ? -EINVAL : 0;
}

static int vidioc_g_audio(struct file *file, void *priv,
                struct v4l2_audio *a)
{
    a->index = 0;
    strlcpy(a->name, "Radio", sizeof(a->name));
    a->capability = V4L2_AUDCAP_STEREO;
    return 0;
}

static int vidioc_s_audio(struct file *file, void *priv,
                const struct v4l2_audio *a)
{
    return a->index ? -EINVAL : 0;
}

static const struct v4l2_ioctl_ops pcm20_ioctl_ops = {
    .vidioc_querycap    = vidioc_querycap,
    .vidioc_g_tuner     = vidioc_g_tuner,
    .vidioc_s_tuner     = vidioc_s_tuner,
    .vidioc_g_frequency = vidioc_g_frequency,
    .vidioc_s_frequency = vidioc_s_frequency,
    .vidioc_queryctrl   = vidioc_queryctrl,
    .vidioc_g_ctrl      = vidioc_g_ctrl,
    .vidioc_s_ctrl      = vidioc_s_ctrl,
    .vidioc_g_audio     = vidioc_g_audio,
    .vidioc_s_audio     = vidioc_s_audio,
    .vidioc_g_input     = vidioc_g_input,
    .vidioc_s_input     = vidioc_s_input,
};

static int __init pcm20_init(void)
{
    struct pcm20 *dev = &pcm20_card;
    struct v4l2_device *v4l2_dev = &dev->v4l2_dev;
    int res;

    dev->aci = snd_aci_get_aci();
    if (dev->aci == NULL) {
        v4l2_err(v4l2_dev,
             "you must load the snd-miro driver first!\n");
        return -ENODEV;
    }
    strlcpy(v4l2_dev->name, "miropcm20", sizeof(v4l2_dev->name));
    mutex_init(&dev->lock);

    res = v4l2_device_register(NULL, v4l2_dev);
    if (res < 0) {
        v4l2_err(v4l2_dev, "could not register v4l2_device\n");
        return -EINVAL;
    }

    strlcpy(dev->vdev.name, v4l2_dev->name, sizeof(dev->vdev.name));
    dev->vdev.v4l2_dev = v4l2_dev;
    dev->vdev.fops = &pcm20_fops;
    dev->vdev.ioctl_ops = &pcm20_ioctl_ops;
    dev->vdev.release = video_device_release_empty;
    dev->vdev.lock = &dev->lock;
    video_set_drvdata(&dev->vdev, dev);

    if (video_register_device(&dev->vdev, VFL_TYPE_RADIO, radio_nr) < 0)
        goto fail;

    v4l2_info(v4l2_dev, "Mirosound PCM20 Radio tuner\n");
    return 0;
fail:
    v4l2_device_unregister(v4l2_dev);
    return -EINVAL;
}

MODULE_AUTHOR("Ruurd Reitsma, Krzysztof Helt");
MODULE_DESCRIPTION("A driver for the Miro PCM20 radio card.");
MODULE_LICENSE("GPL");

static void __exit pcm20_cleanup(void)
{
    struct pcm20 *dev = &pcm20_card;

    video_unregister_device(&dev->vdev);
    v4l2_device_unregister(&dev->v4l2_dev);
}

module_init(pcm20_init);
module_exit(pcm20_cleanup);