diff options
Diffstat (limited to 'drivers/media/radio/radio-miropcm20.c')
| -rw-r--r-- | drivers/media/radio/radio-miropcm20.c | 245 |
1 files changed, 245 insertions, 0 deletions
diff --git a/drivers/media/radio/radio-miropcm20.c b/drivers/media/radio/radio-miropcm20.c new file mode 100644 index 0000000..a7e93d7 --- /dev/null +++ b/drivers/media/radio/radio-miropcm20.c @@ -0,0 +1,245 @@ +/* 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, + const struct v4l2_tuner *v) +{ + struct pcm20 *dev = video_drvdata(file); + + if (v->index) + return -EINVAL; + if (v->audmode > V4L2_TUNER_MODE_STEREO) + dev->audmode = V4L2_TUNER_MODE_STEREO; + else + dev->audmode = v->audmode; + snd_aci_cmd(dev->aci, ACI_SET_TUNERMONO, + dev->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, + const struct v4l2_frequency *f) +{ + struct pcm20 *dev = video_drvdata(file); + + if (f->tuner != 0 || f->type != V4L2_TUNER_RADIO) + return -EINVAL; + + dev->freq = clamp_t(u32, 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); |