3  * V4L2 controls framework uAPI implementation:
173  * multiple controls have to be set through multiple i2c writes (for example)
180  * error should be returned without actually affecting any controls.
188  * controls were affected. Otherwise all controls before that index were
190  * the given index failed, and you don't know what happened with the controls
201  * tried to set the controls. In all other cases it is a driver/hardware
205  * never modifies controls the error_idx is just set to whatever control
211  * Find the controls in the control array and do some basic checks.
224 		struct v4l2_ext_control *c = &cs->controls[i];  in prepare_ext_ctrls()
242 		 * Old-style private controls are not allowed for  in prepare_ext_ctrls()
243 		 * extended controls.  in prepare_ext_ctrls()
247 				"old-style private controls not allowed\n");  in prepare_ext_ctrls()
320 	 * We are done if there were no controls that belong to a multi-  in prepare_ext_ctrls()
327 	 * The code below figures out in O(n) time which controls in the list  in prepare_ext_ctrls()
367  * whether there are any controls at all.
378  * Get extended controls. Allocates the helpers array if needed.
382  * completed, and in that case p_req_valid is true for all controls.
438 		 * volatile controls at the time of request completion  in v4l2_g_ext_ctrls_common()
465 				ret = def_to_user(cs->controls + idx, ref->ctrl);  in v4l2_g_ext_ctrls_common()
469 				ret = req_to_user(cs->controls + idx, ref);  in v4l2_g_ext_ctrls_common()
471 				ret = new_to_user(cs->controls + idx, ref->ctrl);  in v4l2_g_ext_ctrls_common()
473 				ret = cur_to_user(cs->controls + idx, ref->ctrl);  in v4l2_g_ext_ctrls_common()
501 /* Validate controls. */
528 		 * controls may have been set already and we want to do a  in validate_ctrls()
544 			p_new.p_s64 = &cs->controls[i].value64;  in validate_ctrls()
546 			p_new.p_s32 = &cs->controls[i].value;  in validate_ctrls()
554 /* Try or try-and-set controls */
618 		 * of controls).  in try_set_ext_ctrls_common()
632 					new_auto_val = cs->controls[tmp_idx].value;  in try_set_ext_ctrls_common()
650 			ret = user_to_new(cs->controls + idx, ctrl);  in try_set_ext_ctrls_common()
677 				ret = new_to_user(cs->controls + idx,  in try_set_ext_ctrls_common()
740 	/* Compound controls are not supported. The new_to_user() and  in get_ctrl()
848  * Helper functions for drivers to get/set controls.