diff options
| -rw-r--r-- | drivers/media/i2c/ov7670.c | 46 |
1 files changed, 45 insertions, 1 deletions
diff --git a/drivers/media/i2c/ov7670.c b/drivers/media/i2c/ov7670.c index b61d88e7f3eb..c6c32f649777 100644 --- a/drivers/media/i2c/ov7670.c +++ b/drivers/media/i2c/ov7670.c @@ -163,6 +163,11 @@ MODULE_PARM_DESC(debug, "Debug level (0-1)"); #define DBLV_X6 0x10 /* clock x6 */ #define DBLV_X8 0x11 /* clock x8 */ +#define REG_SCALING_XSC 0x70 /* Test pattern and horizontal scale factor */ +#define TEST_PATTTERN_0 0x80 +#define REG_SCALING_YSC 0x71 /* Test pattern and vertical scale factor */ +#define TEST_PATTTERN_1 0x80 + #define REG_REG76 0x76 /* OV's name */ #define R76_BLKPCOR 0x80 /* Black pixel correction enable */ #define R76_WHTPCOR 0x40 /* White pixel correction enable */ @@ -292,7 +297,8 @@ static struct regval_list ov7670_default_regs[] = { { REG_COM3, 0 }, { REG_COM14, 0 }, /* Mystery scaling numbers */ - { 0x70, 0x3a }, { 0x71, 0x35 }, + { REG_SCALING_XSC, 0x3a }, + { REG_SCALING_YSC, 0x35 }, { 0x72, 0x11 }, { 0x73, 0xf0 }, { 0xa2, 0x02 }, { REG_COM10, 0x0 }, @@ -568,6 +574,19 @@ static int ov7670_write(struct v4l2_subdev *sd, unsigned char reg, return ov7670_write_i2c(sd, reg, value); } +static int ov7670_update_bits(struct v4l2_subdev *sd, unsigned char reg, + unsigned char mask, unsigned char value) +{ + unsigned char orig; + int ret; + + ret = ov7670_read(sd, reg, &orig); + if (ret) + return ret; + + return ov7670_write(sd, reg, (orig & ~mask) | (value & mask)); +} + /* * Write a list of register settings; ff/ff stops the process. */ @@ -1470,6 +1489,25 @@ static int ov7670_s_autoexp(struct v4l2_subdev *sd, return ret; } +static const char * const ov7670_test_pattern_menu[] = { + "No test output", + "Shifting \"1\"", + "8-bar color bar", + "Fade to gray color bar", +}; + +static int ov7670_s_test_pattern(struct v4l2_subdev *sd, int value) +{ + int ret; + + ret = ov7670_update_bits(sd, REG_SCALING_XSC, TEST_PATTTERN_0, + value & BIT(0) ? TEST_PATTTERN_0 : 0); + if (ret) + return ret; + + return ov7670_update_bits(sd, REG_SCALING_YSC, TEST_PATTTERN_1, + value & BIT(1) ? TEST_PATTTERN_1 : 0); +} static int ov7670_g_volatile_ctrl(struct v4l2_ctrl *ctrl) { @@ -1516,6 +1554,8 @@ static int ov7670_s_ctrl(struct v4l2_ctrl *ctrl) return ov7670_s_exp(sd, info->exposure->val); } return ov7670_s_autoexp(sd, ctrl->val); + case V4L2_CID_TEST_PATTERN: + return ov7670_s_test_pattern(sd, ctrl->val); } return -EINVAL; } @@ -1770,6 +1810,10 @@ static int ov7670_probe(struct i2c_client *client, info->auto_exposure = v4l2_ctrl_new_std_menu(&info->hdl, &ov7670_ctrl_ops, V4L2_CID_EXPOSURE_AUTO, V4L2_EXPOSURE_MANUAL, 0, V4L2_EXPOSURE_AUTO); + v4l2_ctrl_new_std_menu_items(&info->hdl, &ov7670_ctrl_ops, + V4L2_CID_TEST_PATTERN, + ARRAY_SIZE(ov7670_test_pattern_menu) - 1, 0, 0, + ov7670_test_pattern_menu); sd->ctrl_handler = &info->hdl; if (info->hdl.error) { ret = info->hdl.error; |