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Commit d807dec5 authored by Tobias Lorenz's avatar Tobias Lorenz Committed by Mauro Carvalho Chehab
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V4L/DVB (10532): Correction of Stereo detection/setting and signal strength indication 



Thanks to Bob Ross <pigiron@gmx.com>
- correction of stereo detection/setting
- correction of signal strength indicator scaling

Signed-off-by: default avatarTobias Lorenz <tobias.lorenz@gmx.net>
Signed-off-by: default avatarMauro Carvalho Chehab <mchehab@redhat.com>
parent ef88f2b5

drivers/media/radio/radio-si470x.c

+13 −8
Original line number Diff line number Diff line
@@ -98,6 +98,9 @@ 
 * 		- blacklisted KWorld radio in hid-core.c and hid-ids.h

 * 2008-12-03	Mark Lord <mlord@pobox.com>

 *		- add support for DealExtreme USB Radio

 * 2009-01-31	Bob Ross <pigiron@gmx.com>

 *		- correction of stereo detection/setting

 *		- correction of signal strength indicator scaling

 *

 * ToDo:

 * - add firmware download/update support
@@ -1385,20 +1388,22 @@ static int si470x_vidioc_g_tuner(struct file *file, void *priv, 
	};



	/* stereo indicator == stereo (instead of mono) */

	if ((radio->registers[STATUSRSSI] & STATUSRSSI_ST) == 1)

		tuner->rxsubchans = V4L2_TUNER_SUB_MONO | V4L2_TUNER_SUB_STEREO;

	else

	if ((radio->registers[STATUSRSSI] & STATUSRSSI_ST) == 0)

		tuner->rxsubchans = V4L2_TUNER_SUB_MONO;

	else

		tuner->rxsubchans = V4L2_TUNER_SUB_MONO | V4L2_TUNER_SUB_STEREO;



	/* mono/stereo selector */

	if ((radio->registers[POWERCFG] & POWERCFG_MONO) == 1)

		tuner->audmode = V4L2_TUNER_MODE_MONO;

	else

	if ((radio->registers[POWERCFG] & POWERCFG_MONO) == 0)

		tuner->audmode = V4L2_TUNER_MODE_STEREO;

	else

		tuner->audmode = V4L2_TUNER_MODE_MONO;



	/* min is worst, max is best; signal:0..0xffff; rssi: 0..0xff */

	tuner->signal = (radio->registers[STATUSRSSI] & STATUSRSSI_RSSI)

				* 0x0101;

	/* measured in units of dbµV in 1 db increments (max at ~75 dbµV) */

	tuner->signal = (radio->registers[STATUSRSSI] & STATUSRSSI_RSSI);

	/* the ideal factor is 0xffff/75 = 873,8 */

	tuner->signal = (tuner->signal * 873) + (8 * tuner->signal / 10);



	/* automatic frequency control: -1: freq to low, 1 freq to high */

	/* AFCRL does only indicate that freq. differs, not if too low/high */