libcamera: ipa: Support array controls in ipa_control_value_entry

Report in a new field of the ipa_control_value_entry structure if the
value contains an array. Reorganize the other fields of the structure to
avoid increasing its size.

Signed-off-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Reviewed-by: Kieran Bingham <kieran.bingham@ideasonboard.com>

include/ipa/ipa_controls.h

@@ -26,9 +26,11 @@ struct ipa_controls_header {
 
 struct ipa_control_value_entry {
 	uint32_t id;
-	uint32_t type;
-	uint32_t count;
+	uint8_t type;
+	uint8_t is_array;
+	uint16_t count;
 	uint32_t offset;
+	uint32_t padding[1];
 };
 
 struct ipa_control_range_entry {

src/libcamera/ipa_controls.cpp

@@ -163,11 +163,15 @@ static_assert(sizeof(ipa_controls_header) == 32,
  * The numerical ID of the control
  * \var ipa_control_value_entry::type
  * The type of the control (defined by enum ControlType)
+ * \var ipa_control_value_entry::is_array
+ * True if the control value stores an array, false otherwise
  * \var ipa_control_value_entry::count
  * The number of control array entries for array controls (1 otherwise)
  * \var ipa_control_value_entry::offset
  * The offset in bytes from the beginning of the data section to the control
  * value data (shall be a multiple of 8 bytes).
+ * \var ipa_control_value_entry::padding
+ * Padding bytes (shall be set to 0)
  */
 
 static_assert(sizeof(ipa_control_value_entry) == 16,