drivers: media: imx296: Updated imx296 driver for external trigger

Updated imx296 driver to support external trigger mode via XTR pin.
Added module parameter to control this mode.

Signed-off-by: Ben Benson <ben.benson@raspberrypi.com>

diff --git a/drivers/media/i2c/imx296.c b/drivers/media/i2c/imx296.c
index 395bfe4..e16588f 100644 (file)
--- a/drivers/media/i2c/imx296.c
+++ b/drivers/media/i2c/imx296.c
@@ -20,6 +20,10 @@
 #include <media/v4l2-fwnode.h>
 #include <media/v4l2-subdev.h>
 
+static int trigger_mode;
+module_param(trigger_mode, int, 0644);
+MODULE_PARM_DESC(trigger_mode, "Set trigger mode: 0=default, 1=XTRIG");
+
 #define IMX296_PIXEL_ARRAY_WIDTH                       1456
 #define IMX296_PIXEL_ARRAY_HEIGHT                      1088
 
@@ -578,6 +582,12 @@ static int imx296_stream_on(struct imx296 *sensor)
 
        imx296_write(sensor, IMX296_CTRL00, 0, &ret);
        usleep_range(2000, 5000);
+
+       if (trigger_mode == 1) {
+               imx296_write(sensor, IMX296_CTRL0B, IMX296_CTRL0B_TRIGEN, &ret);
+               imx296_write(sensor, IMX296_LOWLAGTRG,  IMX296_LOWLAGTRG_FAST, &ret);
+       }
+
        imx296_write(sensor, IMX296_CTRL0A, 0, &ret);
 
        return ret;