246 строки
6.6 KiB
C
246 строки
6.6 KiB
C
/* Miro PCM20 radio driver for Linux radio support
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* (c) 1998 Ruurd Reitsma <R.A.Reitsma@wbmt.tudelft.nl>
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* Thanks to Norberto Pellici for the ACI device interface specification
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* The API part is based on the radiotrack driver by M. Kirkwood
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* This driver relies on the aci mixer provided by the snd-miro
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* ALSA driver.
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* Look there for further info...
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*/
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/* What ever you think about the ACI, version 0x07 is not very well!
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* I can't get frequency, 'tuner status', 'tuner flags' or mute/mono
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* conditions... Robert
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*/
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#include <linux/module.h>
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#include <linux/init.h>
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#include <linux/videodev2.h>
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#include <media/v4l2-device.h>
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#include <media/v4l2-ioctl.h>
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#include <media/v4l2-ctrls.h>
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#include <media/v4l2-fh.h>
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#include <media/v4l2-event.h>
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#include <sound/aci.h>
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static int radio_nr = -1;
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module_param(radio_nr, int, 0);
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MODULE_PARM_DESC(radio_nr, "Set radio device number (/dev/radioX). Default: -1 (autodetect)");
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struct pcm20 {
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struct v4l2_device v4l2_dev;
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struct video_device vdev;
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struct v4l2_ctrl_handler ctrl_handler;
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unsigned long freq;
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u32 audmode;
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struct snd_miro_aci *aci;
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struct mutex lock;
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};
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static struct pcm20 pcm20_card = {
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.freq = 87 * 16000,
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.audmode = V4L2_TUNER_MODE_STEREO,
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};
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static int pcm20_setfreq(struct pcm20 *dev, unsigned long freq)
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{
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unsigned char freql;
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unsigned char freqh;
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struct snd_miro_aci *aci = dev->aci;
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freq /= 160;
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if (!(aci->aci_version == 0x07 || aci->aci_version >= 0xb0))
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freq /= 10; /* I don't know exactly which version
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* needs this hack */
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freql = freq & 0xff;
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freqh = freq >> 8;
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return snd_aci_cmd(aci, ACI_WRITE_TUNE, freql, freqh);
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}
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static const struct v4l2_file_operations pcm20_fops = {
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.owner = THIS_MODULE,
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.open = v4l2_fh_open,
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.poll = v4l2_ctrl_poll,
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.release = v4l2_fh_release,
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.unlocked_ioctl = video_ioctl2,
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};
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static int vidioc_querycap(struct file *file, void *priv,
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struct v4l2_capability *v)
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{
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struct pcm20 *dev = video_drvdata(file);
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strlcpy(v->driver, "Miro PCM20", sizeof(v->driver));
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strlcpy(v->card, "Miro PCM20", sizeof(v->card));
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snprintf(v->bus_info, sizeof(v->bus_info), "ISA:%s", dev->v4l2_dev.name);
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v->device_caps = V4L2_CAP_TUNER | V4L2_CAP_RADIO;
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v->capabilities = v->device_caps | V4L2_CAP_DEVICE_CAPS;
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return 0;
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}
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static int vidioc_g_tuner(struct file *file, void *priv,
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struct v4l2_tuner *v)
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{
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struct pcm20 *dev = video_drvdata(file);
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int res;
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if (v->index)
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return -EINVAL;
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strlcpy(v->name, "FM", sizeof(v->name));
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v->type = V4L2_TUNER_RADIO;
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v->rangelow = 87*16000;
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v->rangehigh = 108*16000;
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res = snd_aci_cmd(dev->aci, ACI_READ_TUNERSTATION, -1, -1);
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v->signal = (res & 0x80) ? 0 : 0xffff;
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/* Note: stereo detection does not work if the audio is muted,
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it will default to mono in that case. */
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res = snd_aci_cmd(dev->aci, ACI_READ_TUNERSTEREO, -1, -1);
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v->rxsubchans = (res & 0x40) ? V4L2_TUNER_SUB_MONO :
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V4L2_TUNER_SUB_STEREO;
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v->capability = V4L2_TUNER_CAP_LOW | V4L2_TUNER_CAP_STEREO;
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v->audmode = dev->audmode;
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return 0;
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}
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static int vidioc_s_tuner(struct file *file, void *priv,
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const struct v4l2_tuner *v)
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{
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struct pcm20 *dev = video_drvdata(file);
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if (v->index)
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return -EINVAL;
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if (v->audmode > V4L2_TUNER_MODE_STEREO)
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dev->audmode = V4L2_TUNER_MODE_STEREO;
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else
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dev->audmode = v->audmode;
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snd_aci_cmd(dev->aci, ACI_SET_TUNERMONO,
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dev->audmode == V4L2_TUNER_MODE_MONO, -1);
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return 0;
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}
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static int vidioc_g_frequency(struct file *file, void *priv,
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struct v4l2_frequency *f)
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{
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struct pcm20 *dev = video_drvdata(file);
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if (f->tuner != 0)
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return -EINVAL;
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f->type = V4L2_TUNER_RADIO;
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f->frequency = dev->freq;
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return 0;
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}
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static int vidioc_s_frequency(struct file *file, void *priv,
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const struct v4l2_frequency *f)
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{
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struct pcm20 *dev = video_drvdata(file);
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if (f->tuner != 0 || f->type != V4L2_TUNER_RADIO)
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return -EINVAL;
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dev->freq = clamp_t(u32, f->frequency, 87 * 16000U, 108 * 16000U);
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pcm20_setfreq(dev, dev->freq);
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return 0;
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}
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static int pcm20_s_ctrl(struct v4l2_ctrl *ctrl)
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{
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struct pcm20 *dev = container_of(ctrl->handler, struct pcm20, ctrl_handler);
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switch (ctrl->id) {
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case V4L2_CID_AUDIO_MUTE:
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snd_aci_cmd(dev->aci, ACI_SET_TUNERMUTE, ctrl->val, -1);
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return 0;
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}
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return -EINVAL;
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}
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static const struct v4l2_ioctl_ops pcm20_ioctl_ops = {
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.vidioc_querycap = vidioc_querycap,
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.vidioc_g_tuner = vidioc_g_tuner,
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.vidioc_s_tuner = vidioc_s_tuner,
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.vidioc_g_frequency = vidioc_g_frequency,
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.vidioc_s_frequency = vidioc_s_frequency,
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.vidioc_log_status = v4l2_ctrl_log_status,
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.vidioc_subscribe_event = v4l2_ctrl_subscribe_event,
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.vidioc_unsubscribe_event = v4l2_event_unsubscribe,
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};
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static const struct v4l2_ctrl_ops pcm20_ctrl_ops = {
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.s_ctrl = pcm20_s_ctrl,
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};
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static int __init pcm20_init(void)
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{
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struct pcm20 *dev = &pcm20_card;
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struct v4l2_device *v4l2_dev = &dev->v4l2_dev;
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struct v4l2_ctrl_handler *hdl;
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int res;
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dev->aci = snd_aci_get_aci();
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if (dev->aci == NULL) {
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v4l2_err(v4l2_dev,
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"you must load the snd-miro driver first!\n");
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return -ENODEV;
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}
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strlcpy(v4l2_dev->name, "radio-miropcm20", sizeof(v4l2_dev->name));
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mutex_init(&dev->lock);
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res = v4l2_device_register(NULL, v4l2_dev);
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if (res < 0) {
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v4l2_err(v4l2_dev, "could not register v4l2_device\n");
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return -EINVAL;
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}
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hdl = &dev->ctrl_handler;
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v4l2_ctrl_handler_init(hdl, 1);
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v4l2_ctrl_new_std(hdl, &pcm20_ctrl_ops,
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V4L2_CID_AUDIO_MUTE, 0, 1, 1, 1);
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v4l2_dev->ctrl_handler = hdl;
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if (hdl->error) {
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res = hdl->error;
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v4l2_err(v4l2_dev, "Could not register control\n");
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goto err_hdl;
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}
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strlcpy(dev->vdev.name, v4l2_dev->name, sizeof(dev->vdev.name));
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dev->vdev.v4l2_dev = v4l2_dev;
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dev->vdev.fops = &pcm20_fops;
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dev->vdev.ioctl_ops = &pcm20_ioctl_ops;
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dev->vdev.release = video_device_release_empty;
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dev->vdev.lock = &dev->lock;
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set_bit(V4L2_FL_USE_FH_PRIO, &dev->vdev.flags);
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video_set_drvdata(&dev->vdev, dev);
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snd_aci_cmd(dev->aci, ACI_SET_TUNERMONO,
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dev->audmode == V4L2_TUNER_MODE_MONO, -1);
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pcm20_setfreq(dev, dev->freq);
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if (video_register_device(&dev->vdev, VFL_TYPE_RADIO, radio_nr) < 0)
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goto err_hdl;
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v4l2_info(v4l2_dev, "Mirosound PCM20 Radio tuner\n");
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return 0;
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err_hdl:
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v4l2_ctrl_handler_free(hdl);
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v4l2_device_unregister(v4l2_dev);
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return -EINVAL;
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}
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MODULE_AUTHOR("Ruurd Reitsma, Krzysztof Helt");
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MODULE_DESCRIPTION("A driver for the Miro PCM20 radio card.");
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MODULE_LICENSE("GPL");
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static void __exit pcm20_cleanup(void)
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{
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struct pcm20 *dev = &pcm20_card;
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video_unregister_device(&dev->vdev);
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snd_aci_cmd(dev->aci, ACI_SET_TUNERMUTE, 1, -1);
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v4l2_ctrl_handler_free(&dev->ctrl_handler);
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v4l2_device_unregister(&dev->v4l2_dev);
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}
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module_init(pcm20_init);
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module_exit(pcm20_cleanup);
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