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[media] radio-mr800: add support for stereo and signal detection

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Thanks to an older driver by Faidon Liambotis <paravoid@debian.org> (as noted
in the radio-mr800 comment block at the start) for figuring out how to get the
signal/stereo state.

Signed-off-by: Hans Verkuil <hans.verkuil@cisco.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>
This commit is contained in:
Hans Verkuil 2012-04-27 13:28:34 -03:00 committed by Mauro Carvalho Chehab
parent 85578b0fdc
commit 77cf393434
1 changed files with 38 additions and 5 deletions
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43
drivers/media/radio/radio-mr800.c
View file

@ -103,6 +103,7 @@ devices, that would be 76 and 91. */
* List isn't full and will be updated with implementation of new functions
*/
#define AMRADIO_SET_FREQ 0xa4
#define AMRADIO_GET_SIGNAL 0xa7
#define AMRADIO_SET_MUTE 0xab
#define AMRADIO_SET_MONO 0xae
@ -236,6 +237,35 @@ static int amradio_set_stereo(struct amradio_device *radio, char argument)
return 0;
}
static int amradio_get_stat(struct amradio_device *radio, bool *is_stereo, u32 *signal)
{
int retval;
int size;
radio->buffer[0] = 0x00;
radio->buffer[1] = 0x55;
radio->buffer[2] = 0xaa;
radio->buffer[3] = 0x00;
radio->buffer[4] = AMRADIO_GET_SIGNAL;
radio->buffer[5] = 0x00;
radio->buffer[6] = 0x00;
radio->buffer[7] = 0x08;
retval = usb_bulk_msg(radio->usbdev, usb_sndbulkpipe(radio->usbdev, 0x02),
radio->buffer, BUFFER_LENGTH, &size, USB_TIMEOUT);
if (!retval)
retval = usb_bulk_msg(radio->usbdev, usb_rcvbulkpipe(radio->usbdev, 0x81),
radio->buffer, BUFFER_LENGTH, &size, USB_TIMEOUT);
if (retval || size != BUFFER_LENGTH) {
amradio_dev_warn(&radio->vdev.dev, "get stat failed\n");
return retval;
}
*is_stereo = radio->buffer[2] >> 7;
*signal = (radio->buffer[3] & 0xf0) << 8;
return 0;
}
/* Handle unplugging the device.
* We call video_unregister_device in any case.
* The last function called in this procedure is
@ -272,20 +302,23 @@ static int vidioc_g_tuner(struct file *file, void *priv,
struct v4l2_tuner *v)
{
struct amradio_device *radio = video_drvdata(file);
bool is_stereo = false;
int retval;
if (v->index > 0)
return -EINVAL;
v->signal = 0;
retval = amradio_get_stat(radio, &is_stereo, &v->signal);
if (retval)
return retval;
strcpy(v->name, "FM");
v->type = V4L2_TUNER_RADIO;
v->rangelow = FREQ_MIN * FREQ_MUL;
v->rangehigh = FREQ_MAX * FREQ_MUL;
v->capability = V4L2_TUNER_CAP_LOW | V4L2_TUNER_CAP_STEREO;
/* We do not know how to get hold of the stereo indicator, so
all we can do is give back both mono and stereo, which
effectively means that we don't know. */
v->rxsubchans = V4L2_TUNER_SUB_STEREO | V4L2_TUNER_SUB_MONO;
v->signal = 0xffff;
v->rxsubchans = is_stereo ? V4L2_TUNER_SUB_STEREO : V4L2_TUNER_SUB_MONO;
v->audmode = radio->stereo ?
V4L2_TUNER_MODE_STEREO : V4L2_TUNER_MODE_MONO;
return 0;