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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: Tobias Lorenz <tobias.lorenz@gmx.net>
Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>
This commit is contained in:
Tobias Lorenz 2009-02-12 14:56:10 -03:00 committed by Mauro Carvalho Chehab
parent ef88f2b563
commit d807dec59d
1 changed files with 13 additions and 8 deletions
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21
drivers/media/radio/radio-si470x.c
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@ -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 */