Add sysfs node to check that driver is fully initialized

/sys/module/ov5645_camera_mipi_v2/parameters/ov5645_initialized returns
1 when camera is found and driver fully initialized and 0 otherwise

b/124529767

Change-Id: I2bcca92bf8991eaacc465df52f3e998f6abace18
diff --git a/drivers/media/platform/mxc/capture/ov5645_mipi_v2.c b/drivers/media/platform/mxc/capture/ov5645_mipi_v2.c
index ced8b2e..6c47f66 100644
--- a/drivers/media/platform/mxc/capture/ov5645_mipi_v2.c
+++ b/drivers/media/platform/mxc/capture/ov5645_mipi_v2.c
@@ -126,6 +126,7 @@
 	/* Fields to keep track of loaded settings */
 	enum ov5645_frame_rate loaded_fps;
 	enum ov5645_mode loaded_mode;
+	bool initialized;
 };
 
 struct ov5645_res {
@@ -3511,10 +3512,18 @@
 	return cnt;
 }
 
+static int ov5645_get_initialized(char *buffer, struct kernel_param *kp)
+{
+	int cnt;
+	cnt = sprintf(buffer, "%d", ov5645_data.initialized ? 1 : 0);
+	return cnt;
+}
+
 module_param_call(ov5645_set_regs, ov5645_set_regs, NULL, NULL, 0644);
 module_param_call(ov5645_print_reg, ov5645_set_print_reg, ov5645_get_print_reg,
 		NULL, 0644);
 module_param_call(ov5645_af, ov5645_set_af_mode, ov5645_read_af, NULL, 0644);
+module_param_call(ov5645_initialized, NULL, ov5645_get_initialized, NULL, 0644);
 
 /*!
  * ov5645 I2C probe function
@@ -3653,6 +3662,7 @@
 
 	OV5645_stream_off();
 	pr_info("camera ov5645_mipi is found\n");
+	ov5645_data.initialized = true;
 	return retval;
 }