media: ar0521: Add V4L2_CID_ANALOG_GAIN

Add support for V4L2_CID_ANALOG_GAIN. The control programs the global
gain register which applies to all color channels.

Signed-off-by: Jacopo Mondi <jacopo@jmondi.org>
Signed-off-by: Sakari Ailus <sakari.ailus@linux.intel.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab@kernel.org>

diff --git a/drivers/media/i2c/ar0521.c b/drivers/media/i2c/ar0521.c
index 45fcf3798ad2048ddf0fa5ea8d170d4b668fbfad..20a87dde2289f6a403dba5429e39811a637441e0 100644 (file)
--- a/drivers/media/i2c/ar0521.c
+++ b/drivers/media/i2c/ar0521.c
@@ -35,6 +35,11 @@
 #define AR0521_HEIGHT_BLANKING_MIN     38u /* must be even */
 #define AR0521_TOTAL_WIDTH_MIN      2968u
 
+#define AR0521_ANA_GAIN_MIN            0x00
+#define AR0521_ANA_GAIN_MAX            0x3f
+#define AR0521_ANA_GAIN_STEP           0x01
+#define AR0521_ANA_GAIN_DEFAULT                0x00
+
 /* AR0521 registers */
 #define AR0521_REG_VT_PIX_CLK_DIV              0x0300
 #define AR0521_REG_FRAME_LENGTH_LINES          0x0340
@@ -50,6 +55,8 @@
 #define   AR0521_REG_RESET_RESTART               BIT(1)
 #define   AR0521_REG_RESET_INIT                          BIT(0)
 
+#define AR0521_REG_ANA_GAIN_CODE_GLOBAL                0x3028
+
 #define AR0521_REG_GREEN1_GAIN                 0x3056
 #define AR0521_REG_BLUE_GAIN                   0x3058
 #define AR0521_REG_RED_GAIN                    0x305A
@@ -455,6 +462,10 @@ static int ar0521_s_ctrl(struct v4l2_ctrl *ctrl)
        case V4L2_CID_VBLANK:
                ret = ar0521_set_geometry(sensor);
                break;
+       case V4L2_CID_ANALOGUE_GAIN:
+               ret = ar0521_write_reg(sensor, AR0521_REG_ANA_GAIN_CODE_GLOBAL,
+                                      ctrl->val);
+               break;
        case V4L2_CID_GAIN:
        case V4L2_CID_RED_BALANCE:
        case V4L2_CID_BLUE_BALANCE:
@@ -498,6 +509,11 @@ static int ar0521_init_controls(struct ar0521_dev *sensor)
        /* We can use our own mutex for the ctrl lock */
        hdl->lock = &sensor->lock;
 
+       /* Analog gain */
+       v4l2_ctrl_new_std(hdl, ops, V4L2_CID_ANALOGUE_GAIN,
+                         AR0521_ANA_GAIN_MIN, AR0521_ANA_GAIN_MAX,
+                         AR0521_ANA_GAIN_STEP, AR0521_ANA_GAIN_DEFAULT);
+
        /* Manual gain */
        ctrls->gain = v4l2_ctrl_new_std(hdl, ops, V4L2_CID_GAIN, 0, 511, 1, 0);
        ctrls->red_balance = v4l2_ctrl_new_std(hdl, ops, V4L2_CID_RED_BALANCE,