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- /* Miro PCM20 radio driver for Linux radio support
- * (c) 1998 Ruurd Reitsma <R.A.Reitsma@wbmt.tudelft.nl>
- * 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 <media/v4l2-ctrls.h>
- #include <media/v4l2-fh.h>
- #include <media/v4l2-event.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)");
- struct pcm20 {
- struct v4l2_device v4l2_dev;
- struct video_device vdev;
- struct v4l2_ctrl_handler ctrl_handler;
- unsigned long freq;
- u32 audmode;
- struct snd_miro_aci *aci;
- struct mutex lock;
- };
- static struct pcm20 pcm20_card = {
- .freq = 87 * 16000,
- .audmode = V4L2_TUNER_MODE_STEREO,
- };
- static int pcm20_setfreq(struct pcm20 *dev, unsigned long freq)
- {
- unsigned char freql;
- unsigned char freqh;
- struct snd_miro_aci *aci = dev->aci;
- 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;
- return snd_aci_cmd(aci, ACI_WRITE_TUNE, freql, freqh);
- }
- static const struct v4l2_file_operations pcm20_fops = {
- .owner = THIS_MODULE,
- .open = v4l2_fh_open,
- .poll = v4l2_ctrl_poll,
- .release = v4l2_fh_release,
- .unlocked_ioctl = video_ioctl2,
- };
- static int vidioc_querycap(struct file *file, void *priv,
- struct v4l2_capability *v)
- {
- struct pcm20 *dev = video_drvdata(file);
- strlcpy(v->driver, "Miro PCM20", sizeof(v->driver));
- strlcpy(v->card, "Miro PCM20", sizeof(v->card));
- snprintf(v->bus_info, sizeof(v->bus_info), "ISA:%s", dev->v4l2_dev.name);
- v->device_caps = V4L2_CAP_TUNER | V4L2_CAP_RADIO;
- v->capabilities = v->device_caps | V4L2_CAP_DEVICE_CAPS;
- return 0;
- }
- static int vidioc_g_tuner(struct file *file, void *priv,
- struct v4l2_tuner *v)
- {
- struct pcm20 *dev = video_drvdata(file);
- int res;
- if (v->index)
- return -EINVAL;
- strlcpy(v->name, "FM", sizeof(v->name));
- v->type = V4L2_TUNER_RADIO;
- v->rangelow = 87*16000;
- v->rangehigh = 108*16000;
- res = snd_aci_cmd(dev->aci, ACI_READ_TUNERSTATION, -1, -1);
- v->signal = (res & 0x80) ? 0 : 0xffff;
- /* Note: stereo detection does not work if the audio is muted,
- it will default to mono in that case. */
- res = snd_aci_cmd(dev->aci, ACI_READ_TUNERSTEREO, -1, -1);
- v->rxsubchans = (res & 0x40) ? V4L2_TUNER_SUB_MONO :
- V4L2_TUNER_SUB_STEREO;
- v->capability = V4L2_TUNER_CAP_LOW | V4L2_TUNER_CAP_STEREO;
- v->audmode = dev->audmode;
- return 0;
- }
- static int vidioc_s_tuner(struct file *file, void *priv,
- struct v4l2_tuner *v)
- {
- struct pcm20 *dev = video_drvdata(file);
- if (v->index)
- return -EINVAL;
- if (v->audmode > V4L2_TUNER_MODE_STEREO)
- v->audmode = V4L2_TUNER_MODE_STEREO;
- snd_aci_cmd(dev->aci, ACI_SET_TUNERMONO,
- v->audmode == V4L2_TUNER_MODE_MONO, -1);
- return 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 = clamp(f->frequency, 87 * 16000U, 108 * 16000U);
- pcm20_setfreq(dev, dev->freq);
- return 0;
- }
- static int pcm20_s_ctrl(struct v4l2_ctrl *ctrl)
- {
- struct pcm20 *dev = container_of(ctrl->handler, struct pcm20, ctrl_handler);
- switch (ctrl->id) {
- case V4L2_CID_AUDIO_MUTE:
- snd_aci_cmd(dev->aci, ACI_SET_TUNERMUTE, ctrl->val, -1);
- return 0;
- }
- return -EINVAL;
- }
- 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_log_status = v4l2_ctrl_log_status,
- .vidioc_subscribe_event = v4l2_ctrl_subscribe_event,
- .vidioc_unsubscribe_event = v4l2_event_unsubscribe,
- };
- static const struct v4l2_ctrl_ops pcm20_ctrl_ops = {
- .s_ctrl = pcm20_s_ctrl,
- };
- static int __init pcm20_init(void)
- {
- struct pcm20 *dev = &pcm20_card;
- struct v4l2_device *v4l2_dev = &dev->v4l2_dev;
- struct v4l2_ctrl_handler *hdl;
- 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, "radio-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;
- }
- hdl = &dev->ctrl_handler;
- v4l2_ctrl_handler_init(hdl, 1);
- v4l2_ctrl_new_std(hdl, &pcm20_ctrl_ops,
- V4L2_CID_AUDIO_MUTE, 0, 1, 1, 1);
- v4l2_dev->ctrl_handler = hdl;
- if (hdl->error) {
- res = hdl->error;
- v4l2_err(v4l2_dev, "Could not register control\n");
- goto err_hdl;
- }
- 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;
- set_bit(V4L2_FL_USE_FH_PRIO, &dev->vdev.flags);
- video_set_drvdata(&dev->vdev, dev);
- snd_aci_cmd(dev->aci, ACI_SET_TUNERMONO,
- dev->audmode == V4L2_TUNER_MODE_MONO, -1);
- pcm20_setfreq(dev, dev->freq);
- if (video_register_device(&dev->vdev, VFL_TYPE_RADIO, radio_nr) < 0)
- goto err_hdl;
- v4l2_info(v4l2_dev, "Mirosound PCM20 Radio tuner\n");
- return 0;
- err_hdl:
- v4l2_ctrl_handler_free(hdl);
- 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);
- snd_aci_cmd(dev->aci, ACI_SET_TUNERMUTE, 1, -1);
- v4l2_ctrl_handler_free(&dev->ctrl_handler);
- v4l2_device_unregister(&dev->v4l2_dev);
- }
- module_init(pcm20_init);
- module_exit(pcm20_cleanup);
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