V4L/DVB (8873): gspca: Bad image offset with rev012a of spca561 and adjust exposure.
-Make raw bayer header size change from 20 to 16 affect rev072a only, my 2
rev012a cams both have a header size of 20
-While testing this I also tested the new exposure setting (good work on
finding the register JF), and after quite a bit of testing have found out the
exact meaning of the register, this patch modifies setexposure to control
the exposure over a much wider range.
Signed-off-by: Hans de Goede <j.w.r.degoede@hhs.nl>
Signed-off-by: Jean-Francois Moine <moinejf@free.fr>
Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>
diff --git a/drivers/media/video/gspca/spca561.c b/drivers/media/video/gspca/spca561.c
index d2f689e..1c29c27 100644
--- a/drivers/media/video/gspca/spca561.c
+++ b/drivers/media/video/gspca/spca561.c
@@ -38,9 +38,9 @@
#define CONTRAST_MAX 0x3fff
__u16 exposure; /* rev12a only */
-#define EXPOSURE_MIN 0
+#define EXPOSURE_MIN 1
#define EXPOSURE_DEF 200
-#define EXPOSURE_MAX 762
+#define EXPOSURE_MAX (4095 - 900) /* see set_exposure */
__u8 brightness; /* rev72a only */
#define BRIGHTNESS_MIN 0
@@ -648,9 +648,31 @@
{
struct sd *sd = (struct sd *) gspca_dev;
int expo;
+ int clock_divider;
__u8 data[2];
- expo = sd->exposure + 0x20a8; /* from test */
+ /* Register 0x8309 controls exposure for the spca561,
+ the basic exposure setting goes from 1-2047, where 1 is completely
+ dark and 2047 is very bright. It not only influences exposure but
+ also the framerate (to allow for longer exposure) from 1 - 300 it
+ only raises the exposure time then from 300 - 600 it halves the
+ framerate to be able to further raise the exposure time and for every
+ 300 more it halves the framerate again. This allows for a maximum
+ exposure time of circa 0.2 - 0.25 seconds (30 / (2000/3000) fps).
+ Sometimes this is not enough, the 1-2047 uses bits 0-10, bits 11-12
+ configure a divider for the base framerate which us used at the
+ exposure setting of 1-300. These bits configure the base framerate
+ according to the following formula: fps = 60 / (value + 2) */
+ if (sd->exposure < 2048) {
+ expo = sd->exposure;
+ clock_divider = 0;
+ } else {
+ /* Add 900 to make the 0 setting of the second part of the
+ exposure equal to the 2047 setting of the first part. */
+ expo = (sd->exposure - 2048) + 900;
+ clock_divider = 3;
+ }
+ expo |= clock_divider << 11;
data[0] = expo;
data[1] = expo >> 8;
reg_w_buf(gspca_dev, 0x8309, data, 2);
@@ -680,23 +702,11 @@
static void sd_start_12a(struct gspca_dev *gspca_dev)
{
struct usb_device *dev = gspca_dev->dev;
- int Clck;
+ int Clck = 0x8a; /* lower 0x8X values lead to fps > 30 */
__u8 Reg8307[] = { 0xaa, 0x00 };
int mode;
mode = gspca_dev->cam.cam_mode[(int) gspca_dev->curr_mode].priv;
- switch (mode) {
- case 0:
- case 1:
- Clck = 0x8a;
- break;
- case 2:
- Clck = 0x85;
- break;
- default:
- Clck = 0x83;
- break;
- }
if (mode <= 1) {
/* Use compression on 320x240 and above */
reg_w_val(dev, 0x8500, 0x10 | mode);
@@ -714,6 +724,7 @@
setcontrast(gspca_dev);
setwhite(gspca_dev);
setautogain(gspca_dev);
+ setexposure(gspca_dev);
}
static void sd_start_72a(struct gspca_dev *gspca_dev)
{
@@ -849,6 +860,8 @@
__u8 *data, /* isoc packet */
int len) /* iso packet length */
{
+ struct sd *sd = (struct sd *) gspca_dev;
+
switch (data[0]) {
case 0: /* start of frame */
frame = gspca_frame_add(gspca_dev, LAST_PACKET, frame,
@@ -861,9 +874,13 @@
frame, data, len);
} else {
/* raw bayer (with a header, which we skip) */
-/*fixme: is this specific to the rev012a? */
- data += 16;
- len -= 16;
+ if (sd->chip_revision == Rev012A) {
+ data += 20;
+ len -= 20;
+ } else {
+ data += 16;
+ len -= 16;
+ }
gspca_frame_add(gspca_dev, FIRST_PACKET,
frame, data, len);
}