[PATCH 4/4] media: i2c: imx335: Add support for test pattern generator

[Umang Jain <umang.jain@ideasonboard.com>]

From: Matthias Fend <matthias.fend@emfend.at>

Add support for the sensor's test pattern generator.

Signed-off-by: Matthias Fend <matthias.fend@emfend.at>
Signed-off-by: Kieran Bingham <kieran.bingham@ideasonboard.com>
Signed-off-by: Umang Jain <umang.jain@ideasonboard.com>
---
 drivers/media/i2c/imx335.c | 99 +++++++++++++++++++++++++++++++++++++-
 1 file changed, 98 insertions(+), 1 deletion(-)

diff --git a/drivers/media/i2c/imx335.c b/drivers/media/i2c/imx335.c
index e64ee99cbae4..f9a2337a80c0 100644
--- a/drivers/media/i2c/imx335.c
+++ b/drivers/media/i2c/imx335.c
@@ -45,6 +45,21 @@
 /* Group hold register */
 #define IMX335_REG_HOLD		0x3001
 
+/* Test pattern generator */
+#define IMX335_REG_TPG		0x329e
+#define IMX335_TPG_ALL_000	0
+#define IMX335_TPG_ALL_FFF	1
+#define IMX335_TPG_ALL_555	2
+#define IMX335_TPG_ALL_AAA	3
+#define IMX335_TPG_TOG_555_AAA	4
+#define IMX335_TPG_TOG_AAA_555	5
+#define IMX335_TPG_TOG_000_555	6
+#define IMX335_TPG_TOG_555_000	7
+#define IMX335_TPG_TOG_000_FFF	8
+#define IMX335_TPG_TOG_FFF_000	9
+#define IMX335_TPG_H_COLOR_BARS 10
+#define IMX335_TPG_V_COLOR_BARS 11
+
 /* Input clock rate */
 #define IMX335_INCLK_RATE	24000000
 
@@ -162,6 +177,38 @@ struct imx335 {
 };
 
 
+static const char * const imx335_tpg_menu[] = {
+	"Disabled",
+	"All 000h",
+	"All FFFh",
+	"All 555h",
+	"All AAAh",
+	"Toggle 555/AAAh",
+	"Toggle AAA/555h",
+	"Toggle 000/555h",
+	"Toggle 555/000h",
+	"Toggle 000/FFFh",
+	"Toggle FFF/000h",
+	"Horizontal color bars",
+	"Vertical color bars",
+};
+
+static const int imx335_tpg_val[] = {
+	IMX335_TPG_ALL_000,
+	IMX335_TPG_ALL_000,
+	IMX335_TPG_ALL_FFF,
+	IMX335_TPG_ALL_555,
+	IMX335_TPG_ALL_AAA,
+	IMX335_TPG_TOG_555_AAA,
+	IMX335_TPG_TOG_AAA_555,
+	IMX335_TPG_TOG_000_555,
+	IMX335_TPG_TOG_555_000,
+	IMX335_TPG_TOG_000_FFF,
+	IMX335_TPG_TOG_FFF_000,
+	IMX335_TPG_H_COLOR_BARS,
+	IMX335_TPG_V_COLOR_BARS,
+};
+
 /* Sensor mode registers */
 static const struct imx335_reg mode_2592x1940_regs[] = {
 	{0x3000, 0x01},
@@ -505,6 +552,46 @@ static int imx335_update_exp_gain(struct imx335 *imx335, u32 exposure, u32 gain)
 	return ret;
 }
 
+static int imx335_update_test_pattern(struct imx335 *imx335, u32 pattern_index)
+{
+	int ret;
+
+	if (pattern_index >= ARRAY_SIZE(imx335_tpg_val))
+		return -EINVAL;
+
+	if (pattern_index) {
+		const struct imx335_reg tpg_enable_regs[] = {
+			{ 0x3148, 0x10 },
+			{ 0x3280, 0x00 },
+			{ 0x329c, 0x01 },
+			{ 0x32a0, 0x11 },
+			{ 0x3302, 0x00 },
+			{ 0x3303, 0x00 },
+			{ 0x336c, 0x00 },
+		};
+
+		ret = imx335_write_reg(imx335, IMX335_REG_TPG, 1, imx335_tpg_val[pattern_index]);
+		if (ret)
+			return ret;
+
+		ret = imx335_write_regs(imx335, tpg_enable_regs, ARRAY_SIZE(tpg_enable_regs));
+	} else {
+		const struct imx335_reg tpg_disable_regs[] = {
+			{ 0x3148, 0x00 },
+			{ 0x3280, 0x01 },
+			{ 0x329c, 0x00 },
+			{ 0x32a0, 0x10 },
+			{ 0x3302, 0x32 },
+			{ 0x3303, 0x00 },
+			{ 0x336c, 0x01 },
+		};
+
+		ret = imx335_write_regs(imx335, tpg_disable_regs, ARRAY_SIZE(tpg_disable_regs));
+	}
+
+	return ret;
+}
+
 /**
  * imx335_set_ctrl() - Set subdevice control
  * @ctrl: pointer to v4l2_ctrl structure
@@ -558,6 +645,10 @@ static int imx335_set_ctrl(struct v4l2_ctrl *ctrl)
 
 		ret = imx335_update_exp_gain(imx335, exposure, analog_gain);
 
+		break;
+	case V4L2_CID_TEST_PATTERN:
+		ret = imx335_update_test_pattern(imx335, ctrl->val);
+
 		break;
 	default:
 		dev_err(imx335->dev, "Invalid control %d\n", ctrl->id);
@@ -1122,7 +1213,7 @@ static int imx335_init_controls(struct imx335 *imx335)
 	u32 lpfr;
 	int ret;
 
-	ret = v4l2_ctrl_handler_init(ctrl_hdlr, 6);
+	ret = v4l2_ctrl_handler_init(ctrl_hdlr, 7);
 	if (ret)
 		return ret;
 
@@ -1156,6 +1247,12 @@ static int imx335_init_controls(struct imx335 *imx335)
 						mode->vblank_max,
 						1, mode->vblank);
 
+	v4l2_ctrl_new_std_menu_items(ctrl_hdlr,
+				     &imx335_ctrl_ops,
+				     V4L2_CID_TEST_PATTERN,
+				     ARRAY_SIZE(imx335_tpg_menu) - 1,
+				     0, 0, imx335_tpg_menu);
+
 	/* Read only controls */
 	imx335->pclk_ctrl = v4l2_ctrl_new_std(ctrl_hdlr,
 					      &imx335_ctrl_ops,
-- 
2.41.0