forked from Minki/linux
V4L/DVB: gspca_pac7302: much improved exposure control
My experience with fixing up the controls for the PAS sensors in sonixb, has lead me to re-investigate the exposure control for the pac7302. I've now found a regular exposure register in register bank 3 (which seems to be the sensor registers bank), and with this added a proper fine grained exposure control. This patch also updates the do_autogain function to work properly with this new finer grained control. Signed-off-by: Hans de Goede <hdegoede@redhat.com> Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>
This commit is contained in:
Hans de Goede
Mauro Carvalho Chehab
parent
0e4b91c306
commit
5fb2dde281
@ -24,33 +24,26 @@
|
||||
*/
|
||||
|
||||
/* Some documentation about various registers as determined by trial and error.
|
||||
When the register addresses differ between the 7202 and the 7311 the 2
|
||||
different addresses are written as 7302addr/7311addr, when one of the 2
|
||||
addresses is a - sign that register description is not valid for the
|
||||
matching IC.
|
||||
|
||||
Register page 1:
|
||||
|
||||
Address Description
|
||||
-/0x08 Unknown compressor related, must always be 8 except when not
|
||||
in 640x480 resolution and page 4 reg 2 <= 3 then set it to 9 !
|
||||
-/0x1b Auto white balance related, bit 0 is AWB enable (inverted)
|
||||
bits 345 seem to toggle per color gains on/off (inverted)
|
||||
0x78 Global control, bit 6 controls the LED (inverted)
|
||||
-/0x80 JPEG compression ratio ? Best not touched
|
||||
|
||||
Register page 3/4:
|
||||
Register page 3:
|
||||
|
||||
Address Description
|
||||
0x02 Clock divider 2-63, fps =~ 60 / val. Must be a multiple of 3 on
|
||||
0x02 Clock divider 3-63, fps = 90 / val. Must be a multiple of 3 on
|
||||
the 7302, so one of 3, 6, 9, ..., except when between 6 and 12?
|
||||
-/0x0f Master gain 1-245, low value = high gain
|
||||
0x10/- Master gain 0-31
|
||||
-/0x10 Another gain 0-15, limited influence (1-2x gain I guess)
|
||||
0x03 Variable framerate ctrl reg2==3: 0 -> ~30 fps, 255 -> ~22fps
|
||||
0x04 Another var framerate ctrl reg2==3, reg3==0: 0 -> ~30 fps,
|
||||
63 -> ~27 fps, the 2 msb's must always be 1 !!
|
||||
0x05 Another var framerate ctrl reg2==3, reg3==0, reg4==0xc0:
|
||||
1 -> ~30 fps, 2 -> ~20 fps
|
||||
0x0e Exposure bits 0-7, 0-448, 0 = use full frame time
|
||||
0x0f Exposure bit 8, 0-448, 448 = no exposure at all
|
||||
0x10 Master gain 0-31
|
||||
0x21 Bitfield: 0-1 unused, 2-3 vflip/hflip, 4-5 unknown, 6-7 unused
|
||||
-/0x27 Seems to toggle various gains on / off, Setting bit 7 seems to
|
||||
completely disable the analog amplification block. Set to 0x68
|
||||
for max gain, 0x14 for minimal gain.
|
||||
|
||||
The registers are accessed in the following functions:
|
||||
|
||||
@ -89,8 +82,8 @@ struct sd {
|
||||
unsigned char red_balance;
|
||||
unsigned char blue_balance;
|
||||
unsigned char gain;
|
||||
unsigned char exposure;
|
||||
unsigned char autogain;
|
||||
unsigned short exposure;
|
||||
__u8 hflip;
|
||||
__u8 vflip;
|
||||
u8 flags;
|
||||
@ -128,7 +121,6 @@ static int sd_setexposure(struct gspca_dev *gspca_dev, __s32 val);
|
||||
static int sd_getexposure(struct gspca_dev *gspca_dev, __s32 *val);
|
||||
|
||||
static const struct ctrl sd_ctrls[] = {
|
||||
/* This control is pac7302 only */
|
||||
{
|
||||
{
|
||||
.id = V4L2_CID_BRIGHTNESS,
|
||||
@ -144,7 +136,6 @@ static const struct ctrl sd_ctrls[] = {
|
||||
.set = sd_setbrightness,
|
||||
.get = sd_getbrightness,
|
||||
},
|
||||
/* This control is for both the 7302 and the 7311 */
|
||||
{
|
||||
{
|
||||
.id = V4L2_CID_CONTRAST,
|
||||
@ -160,7 +151,6 @@ static const struct ctrl sd_ctrls[] = {
|
||||
.set = sd_setcontrast,
|
||||
.get = sd_getcontrast,
|
||||
},
|
||||
/* This control is pac7302 only */
|
||||
{
|
||||
{
|
||||
.id = V4L2_CID_SATURATION,
|
||||
@ -218,7 +208,6 @@ static const struct ctrl sd_ctrls[] = {
|
||||
.set = sd_setbluebalance,
|
||||
.get = sd_getbluebalance,
|
||||
},
|
||||
/* All controls below are for both the 7302 and the 7311 */
|
||||
{
|
||||
{
|
||||
.id = V4L2_CID_GAIN,
|
||||
@ -241,11 +230,10 @@ static const struct ctrl sd_ctrls[] = {
|
||||
.type = V4L2_CTRL_TYPE_INTEGER,
|
||||
.name = "Exposure",
|
||||
.minimum = 0,
|
||||
#define EXPOSURE_MAX 255
|
||||
.maximum = EXPOSURE_MAX,
|
||||
.maximum = 1023,
|
||||
.step = 1,
|
||||
#define EXPOSURE_DEF 16 /* 32 ms / 30 fps */
|
||||
#define EXPOSURE_KNEE 50 /* 100 ms / 10 fps */
|
||||
#define EXPOSURE_DEF 66 /* 33 ms / 30 fps */
|
||||
#define EXPOSURE_KNEE 133 /* 66 ms / 15 fps */
|
||||
.default_value = EXPOSURE_DEF,
|
||||
},
|
||||
.set = sd_setexposure,
|
||||
@ -381,7 +369,7 @@ static const __u8 start_7302[] = {
|
||||
#define SKIP 0xaa
|
||||
/* page 3 - the value SKIP says skip the index - see reg_w_page() */
|
||||
static const __u8 page3_7302[] = {
|
||||
0x90, 0x40, 0x03, 0x50, 0xc2, 0x01, 0x14, 0x16,
|
||||
0x90, 0x40, 0x03, 0x00, 0xc0, 0x01, 0x14, 0x16,
|
||||
0x14, 0x12, 0x00, 0x00, 0x00, 0x02, 0x33, 0x00,
|
||||
0x0f, 0x01, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
|
||||
0x00, 0x00, 0x00, 0x47, 0x01, 0xb3, 0x01, 0x00,
|
||||
@ -653,23 +641,39 @@ static void setgain(struct gspca_dev *gspca_dev)
|
||||
static void setexposure(struct gspca_dev *gspca_dev)
|
||||
{
|
||||
struct sd *sd = (struct sd *) gspca_dev;
|
||||
__u8 reg;
|
||||
__u8 clockdiv;
|
||||
__u16 exposure;
|
||||
|
||||
/* register 2 of frame 3/4 contains the clock divider configuring the
|
||||
no fps according to the formula: 60 / reg. sd->exposure is the
|
||||
desired exposure time in ms. */
|
||||
reg = 120 * sd->exposure / 1000;
|
||||
if (reg < 2)
|
||||
reg = 2;
|
||||
else if (reg > 63)
|
||||
reg = 63;
|
||||
/* register 2 of frame 3 contains the clock divider configuring the
|
||||
no fps according to the formula: 90 / reg. sd->exposure is the
|
||||
desired exposure time in 0.5 ms. */
|
||||
clockdiv = (90 * sd->exposure + 1999) / 2000;
|
||||
|
||||
/* Note clockdiv = 3 also works, but when running at 30 fps, depending
|
||||
on the scene being recorded, the camera switches to another
|
||||
quantization table for certain JPEG blocks, and we don't know how
|
||||
to decompress these blocks. So we cap the framerate at 15 fps */
|
||||
if (clockdiv < 6)
|
||||
clockdiv = 6;
|
||||
else if (clockdiv > 63)
|
||||
clockdiv = 63;
|
||||
|
||||
/* reg2 MUST be a multiple of 3, except when between 6 and 12?
|
||||
Always round up, otherwise we cannot get the desired frametime
|
||||
using the partial frame time exposure control */
|
||||
if (clockdiv < 6 || clockdiv > 12)
|
||||
clockdiv = ((clockdiv + 2) / 3) * 3;
|
||||
|
||||
/* frame exposure time in ms = 1000 * clockdiv / 90 ->
|
||||
exposure = (sd->exposure / 2) * 448 / (1000 * clockdiv / 90) */
|
||||
exposure = (sd->exposure * 45 * 448) / (1000 * clockdiv);
|
||||
/* 0 = use full frametime, 448 = no exposure, reverse it */
|
||||
exposure = 448 - exposure;
|
||||
|
||||
/* On the pac7302 reg2 MUST be a multiple of 3, so round it to
|
||||
the nearest multiple of 3, except when between 6 and 12? */
|
||||
if (reg < 6 || reg > 12)
|
||||
reg = ((reg + 1) / 3) * 3;
|
||||
reg_w(gspca_dev, 0xff, 0x03); /* page 3 */
|
||||
reg_w(gspca_dev, 0x02, reg);
|
||||
reg_w(gspca_dev, 0x02, clockdiv);
|
||||
reg_w(gspca_dev, 0x0e, exposure & 0xff);
|
||||
reg_w(gspca_dev, 0x0f, exposure >> 8);
|
||||
|
||||
/* load registers to sensor (Bit 0, auto clear) */
|
||||
reg_w(gspca_dev, 0x11, 0x01);
|
||||
@ -756,22 +760,13 @@ static void do_autogain(struct gspca_dev *gspca_dev)
|
||||
{
|
||||
struct sd *sd = (struct sd *) gspca_dev;
|
||||
int avg_lum = atomic_read(&sd->avg_lum);
|
||||
int desired_lum, deadzone;
|
||||
int desired_lum;
|
||||
const int deadzone = 30;
|
||||
|
||||
if (avg_lum == -1)
|
||||
return;
|
||||
|
||||
desired_lum = 270 + sd->brightness * 4;
|
||||
/* Hack hack, with the 7202 the first exposure step is
|
||||
pretty large, so if we're about to make the first
|
||||
exposure increase make the deadzone large to avoid
|
||||
oscilating */
|
||||
if (desired_lum > avg_lum && sd->gain == GAIN_DEF &&
|
||||
sd->exposure > EXPOSURE_DEF &&
|
||||
sd->exposure < 42)
|
||||
deadzone = 90;
|
||||
else
|
||||
deadzone = 30;
|
||||
desired_lum = 270 + sd->brightness;
|
||||
|
||||
if (sd->autogain_ignore_frames > 0)
|
||||
sd->autogain_ignore_frames--;
|
||||
|
||||
@ -24,11 +24,10 @@
|
||||
*/
|
||||
|
||||
/* We calculate the autogain at the end of the transfer of a frame, at this
|
||||
moment a frame with the old settings is being transmitted, and a frame is
|
||||
being captured with the old settings. So if we adjust the autogain we must
|
||||
ignore atleast the 2 next frames for the new settings to come into effect
|
||||
before doing any other adjustments */
|
||||
#define PAC_AUTOGAIN_IGNORE_FRAMES 3
|
||||
moment a frame with the old settings is being captured and transmitted. So
|
||||
if we adjust the gain or exposure we must ignore atleast the next frame for
|
||||
the new settings to come into effect before doing any other adjustments. */
|
||||
#define PAC_AUTOGAIN_IGNORE_FRAMES 2
|
||||
|
||||
static const unsigned char pac_sof_marker[5] =
|
||||
{ 0xff, 0xff, 0x00, 0xff, 0x96 };
|
||||
|
||||
Loading…
Reference in New Issue
Block a user