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[media] gspca: sn9c2028: Add gain and autogain controls Genius Videocam Live v2

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Autogain algorithm is very simple, if average luminance is low - increase gain,
if it's high - decrease gain. Gain granularity is low enough for this algo to
stabilize quickly.

Signed-off-by: Vasily Khoruzhick <anarsoul@gmail.com>
Signed-off-by: Hans de Goede <hdegoede@redhat.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab@osg.samsung.com>
This commit is contained in:
Vasily Khoruzhick
2015-04-24 04:04:04 -03:00
committed by Mauro Carvalho Chehab
parent 48c291eda7
commit d8fd9f5625
2 changed files with 137 additions and 3 deletions
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18
drivers/media/usb/gspca/sn9c2028.h
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@@ -21,8 +21,15 @@
*
*/
static const unsigned char sn9c2028_sof_marker[5] =
{ 0xff, 0xff, 0x00, 0xc4, 0xc4 };
static const unsigned char sn9c2028_sof_marker[] = {
0xff, 0xff, 0x00, 0xc4, 0xc4, 0x96,
0x00,
0x00, /* seq */
0x00,
0x00,
0x00, /* avg luminance lower 8 bit */
0x00, /* avg luminance higher 8 bit */
};
static unsigned char *sn9c2028_find_sof(struct gspca_dev *gspca_dev,
unsigned char *m, int len)
@@ -32,8 +39,13 @@ static unsigned char *sn9c2028_find_sof(struct gspca_dev *gspca_dev,
/* Search for the SOF marker (fixed part) in the header */
for (i = 0; i < len; i++) {
if (m[i] == sn9c2028_sof_marker[sd->sof_read]) {
if ((m[i] == sn9c2028_sof_marker[sd->sof_read]) ||
(sd->sof_read > 5)) {
sd->sof_read++;
if (sd->sof_read == 11)
sd->avg_lum_l = m[i];
if (sd->sof_read == 12)
sd->avg_lum = (m[i] << 8) + sd->avg_lum_l;
if (sd->sof_read == sizeof(sn9c2028_sof_marker)) {
PDEBUG(D_FRAM,
"SOF found, bytes to analyze: %u."