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path: root/drivers/media/video/gspca/pac7311.c
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Diffstat (limited to 'drivers/media/video/gspca/pac7311.c')
-rw-r--r--drivers/media/video/gspca/pac7311.c54
1 files changed, 33 insertions, 21 deletions
diff --git a/drivers/media/video/gspca/pac7311.c b/drivers/media/video/gspca/pac7311.c
index ea3d7021f40..815bea6edc4 100644
--- a/drivers/media/video/gspca/pac7311.c
+++ b/drivers/media/video/gspca/pac7311.c
@@ -31,7 +31,9 @@ MODULE_LICENSE("GPL");
struct sd {
struct gspca_dev gspca_dev; /* !! must be the first item */
- int avg_lum;
+ int lum_sum;
+ atomic_t avg_lum;
+ atomic_t do_gain;
unsigned char brightness;
unsigned char contrast;
@@ -271,6 +273,7 @@ static int sd_config(struct gspca_dev *gspca_dev,
sd->contrast = CONTRAST_DEF;
sd->colors = COLOR_DEF;
sd->autogain = AUTOGAIN_DEF;
+ sd->ag_cnt = -1;
return 0;
}
@@ -311,6 +314,18 @@ static void setcolors(struct gspca_dev *gspca_dev)
PDEBUG(D_CONF|D_STREAM, "color: %i", sd->colors);
}
+static void setautogain(struct gspca_dev *gspca_dev)
+{
+ struct sd *sd = (struct sd *) gspca_dev;
+
+ if (sd->autogain) {
+ sd->lum_sum = 0;
+ sd->ag_cnt = AG_CNT_START;
+ } else {
+ sd->ag_cnt = -1;
+ }
+}
+
/* this function is called at open time */
static int sd_open(struct gspca_dev *gspca_dev)
{
@@ -320,8 +335,6 @@ static int sd_open(struct gspca_dev *gspca_dev)
static void sd_start(struct gspca_dev *gspca_dev)
{
- struct sd *sd = (struct sd *) gspca_dev;
-
reg_w(gspca_dev, 0xff, 0x01);
reg_w_buf(gspca_dev, 0x0002, "\x48\x0a\x40\x08\x00\x00\x08\x00", 8);
reg_w_buf(gspca_dev, 0x000a, "\x06\xff\x11\xff\x5a\x30\x90\x4c", 8);
@@ -394,6 +407,7 @@ static void sd_start(struct gspca_dev *gspca_dev)
setcontrast(gspca_dev);
setbrightness(gspca_dev);
setcolors(gspca_dev);
+ setautogain(gspca_dev);
/* set correct resolution */
switch (gspca_dev->cam.cam_mode[(int) gspca_dev->curr_mode].priv) {
@@ -431,13 +445,6 @@ static void sd_start(struct gspca_dev *gspca_dev)
reg_w(gspca_dev, 0xff, 0x01);
reg_w(gspca_dev, 0x78, 0x04);
reg_w(gspca_dev, 0x78, 0x05);
-
- if (sd->autogain) {
- sd->ag_cnt = AG_CNT_START;
- sd->avg_lum = 0;
- } else {
- sd->ag_cnt = -1;
- }
}
static void sd_stopN(struct gspca_dev *gspca_dev)
@@ -473,13 +480,20 @@ static void sd_close(struct gspca_dev *gspca_dev)
reg_w(gspca_dev, 0x78, 0x44); /* Bit_0=start stream, Bit_7=LED */
}
-static void setautogain(struct gspca_dev *gspca_dev, int luma)
+static void do_autogain(struct gspca_dev *gspca_dev)
{
+ struct sd *sd = (struct sd *) gspca_dev;
+ int luma;
int luma_mean = 128;
int luma_delta = 20;
__u8 spring = 5;
int Gbright;
+ if (!atomic_read(&sd->do_gain))
+ return;
+ atomic_set(&sd->do_gain, 0);
+
+ luma = atomic_read(&sd->avg_lum);
Gbright = reg_r(gspca_dev, 0x02);
PDEBUG(D_FRAM, "luma mean %d", luma);
if (luma < luma_mean - luma_delta ||
@@ -523,12 +537,13 @@ static void sd_pkt_scan(struct gspca_dev *gspca_dev,
/* start of frame */
if (sd->ag_cnt >= 0 && p > 28) {
- sd->avg_lum += data[p - 23];
+ sd->lum_sum += data[p - 23];
if (--sd->ag_cnt < 0) {
sd->ag_cnt = AG_CNT_START;
- setautogain(gspca_dev,
- sd->avg_lum / AG_CNT_START);
- sd->avg_lum = 0;
+ atomic_set(&sd->avg_lum,
+ sd->lum_sum / AG_CNT_START);
+ sd->lum_sum = 0;
+ atomic_set(&sd->do_gain, 1);
}
}
@@ -677,12 +692,8 @@ static int sd_setautogain(struct gspca_dev *gspca_dev, __s32 val)
struct sd *sd = (struct sd *) gspca_dev;
sd->autogain = val;
- if (val) {
- sd->ag_cnt = AG_CNT_START;
- sd->avg_lum = 0;
- } else {
- sd->ag_cnt = -1;
- }
+ if (gspca_dev->streaming)
+ setautogain(gspca_dev);
return 0;
}
@@ -706,6 +717,7 @@ static struct sd_desc sd_desc = {
.stop0 = sd_stop0,
.close = sd_close,
.pkt_scan = sd_pkt_scan,
+ .dq_callback = do_autogain,
};
/* -- module initialisation -- */