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V4L/DVB (10460): radio-mr800: add stereo support 

Patch introduces new amradio_set_stereo function.
Driver calls this func to make stereo radio reception.
Corrects checking of returned value after usb_bulk_msg.

Signed-off-by: Alexey Klimov <klimov.linux@gmail.com>
Signed-off-by: Douglas Schilling Landgraf <dougsland@redhat.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>
This commit is contained in:
Alexey Klimov 2009-02-05 08:56:07 -03:00 committed by Mauro Carvalho Chehab
parent f7c1a3809b
commit 1bb16d7156
1 changed files with 79 additions and 2 deletions
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81
drivers/media/radio/radio-mr800.c
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@ -93,11 +93,16 @@ devices, that would be 76 and 91. */
*/
#define AMRADIO_SET_FREQ 0xa4
#define AMRADIO_SET_MUTE 0xab
#define AMRADIO_SET_MONO 0xae
/* Comfortable defines for amradio_set_mute */
#define AMRADIO_START 0x00
#define AMRADIO_STOP 0x01
/* Comfortable defines for amradio_set_stereo */
#define WANT_STEREO 0x00
#define WANT_MONO 0x01
/* module parameter */
static int radio_nr = -1;
module_param(radio_nr, int, 0);
@ -263,13 +268,49 @@ static int amradio_setfreq(struct amradio_device *radio, int freq)
return retval;
}
radio->stereo = 0;
mutex_unlock(&radio->lock);
return retval;
}
static int amradio_set_stereo(struct amradio_device *radio, char argument)
{
int retval;
int size;
/* safety check */
if (radio->removed)
return -EIO;
mutex_lock(&radio->lock);
radio->buffer[0] = 0x00;
radio->buffer[1] = 0x55;
radio->buffer[2] = 0xaa;
radio->buffer[3] = 0x00;
radio->buffer[4] = AMRADIO_SET_MONO;
radio->buffer[5] = argument;
radio->buffer[6] = 0x00;
radio->buffer[7] = 0x00;
retval = usb_bulk_msg(radio->usbdev, usb_sndintpipe(radio->usbdev, 2),
(void *) (radio->buffer), BUFFER_LENGTH, &size, USB_TIMEOUT);
if (retval < 0 || size != BUFFER_LENGTH) {
radio->stereo = -1;
mutex_unlock(&radio->lock);
return retval;
}
radio->stereo = 1;
mutex_unlock(&radio->lock);
return retval;
}
/* USB subsystem interface begins here */
/* handle unplugging of the device, release data structures
@ -307,6 +348,7 @@ static int vidioc_g_tuner(struct file *file, void *priv,
struct v4l2_tuner *v)
{
struct amradio_device *radio = video_get_drvdata(video_devdata(file));
int retval;
/* safety check */
if (radio->removed)
@ -318,7 +360,16 @@ static int vidioc_g_tuner(struct file *file, void *priv,
/* TODO: Add function which look is signal stereo or not
* amradio_getstat(radio);
*/
radio->stereo = -1;
/* we call amradio_set_stereo to set radio->stereo
* Honestly, amradio_getstat should cover this in future and
* amradio_set_stereo shouldn't be here
*/
retval = amradio_set_stereo(radio, WANT_STEREO);
if (retval < 0)
amradio_dev_warn(&radio->videodev->dev,
"set stereo failed\n");
strcpy(v->name, "FM");
v->type = V4L2_TUNER_RADIO;
v->rangelow = FREQ_MIN * FREQ_MUL;
@ -339,6 +390,7 @@ static int vidioc_s_tuner(struct file *file, void *priv,
struct v4l2_tuner *v)
{
struct amradio_device *radio = video_get_drvdata(video_devdata(file));
int retval;
/* safety check */
if (radio->removed)
@ -346,6 +398,25 @@ static int vidioc_s_tuner(struct file *file, void *priv,
if (v->index > 0)
return -EINVAL;
/* mono/stereo selector */
switch (v->audmode) {
case V4L2_TUNER_MODE_MONO:
retval = amradio_set_stereo(radio, WANT_MONO);
if (retval < 0)
amradio_dev_warn(&radio->videodev->dev,
"set mono failed\n");
break;
case V4L2_TUNER_MODE_STEREO:
retval = amradio_set_stereo(radio, WANT_STEREO);
if (retval < 0)
amradio_dev_warn(&radio->videodev->dev,
"set stereo failed\n");
break;
default:
return -EINVAL;
}
return 0;
}
@ -505,6 +576,11 @@ static int usb_amradio_open(struct file *file)
return -EIO;
}
retval = amradio_set_stereo(radio, WANT_STEREO);
if (retval < 0)
amradio_dev_warn(&radio->videodev->dev,
"set stereo failed\n");
retval = amradio_setfreq(radio, radio->curfreq);
if (retval < 0)
amradio_dev_warn(&radio->videodev->dev,
@ -646,6 +722,7 @@ static int usb_amradio_probe(struct usb_interface *intf,
radio->users = 0;
radio->usbdev = interface_to_usbdev(intf);
radio->curfreq = 95.16 * FREQ_MUL;
radio->stereo = -1;
mutex_init(&radio->lock);