msm: camera: Add support for reg dump to command buffers

Certain register values are required by user space during flush
to apply settings accordingly. Also, support for dumping registers
at the time of error is needed for debugging. Add support for
dumping register values in a range of offsets to given cmd buffer.

Change-Id: I5912118809f7a7dd701a555639d1057ffe665ce1
Signed-off-by: Mukund Madhusudan Atre <matre@codeaurora.org>

drivers/cam_utils/cam_soc_util.h

@@ -18,6 +18,7 @@
 #include <linux/of_fdt.h>
 
 #include "cam_io_util.h"
+#include <uapi/media/cam_defs.h>
 
 #define NO_SET_RATE  -1
 #define INIT_RATE    -2
@@ -639,4 +640,27 @@ int cam_soc_util_clk_enable_default(struct cam_hw_soc_info *soc_info,
 int cam_soc_util_get_clk_level(struct cam_hw_soc_info *soc_info,
 	int32_t clk_rate, int clk_idx, int32_t *clk_lvl);
 
+/* Callback to get reg space data for specific HW */
+typedef int (*cam_soc_util_regspace_data_cb)(uint32_t reg_base_type,
+	void *ctx, struct cam_hw_soc_info **soc_info_ptr,
+	uint32_t *reg_base_idx);
+
+/**
+ * cam_soc_util_reg_dump_to_cmd_buf()
+ *
+ * @brief:              Camera SOC util for dumping sets of register ranges to
+ *                      to command buffer
+ *
+ * @ctx:                Context info from specific hardware manager
+ * @cmd_desc:           Command buffer descriptor
+ * @req_id:             Last applied req id for which reg dump is required
+ * @reg_data_cb:        Callback function to get reg space info based on type
+ *                      in command buffer
+ *
+ * @return:             Success or Failure
+ */
+int cam_soc_util_reg_dump_to_cmd_buf(void *ctx,
+	struct cam_cmd_buf_desc *cmd_desc, uint64_t req_id,
+	cam_soc_util_regspace_data_cb reg_data_cb);
+
 #endif /* _CAM_SOC_UTIL_H_ */