3  * V4L2 controls framework uAPI implementation:
189  * multiple controls have to be set through multiple i2c writes (for example)
196  * error should be returned without actually affecting any controls.
204  * controls were affected. Otherwise all controls before that index were
206  * the given index failed, and you don't know what happened with the controls
217  * tried to set the controls. In all other cases it is a driver/hardware
221  * never modifies controls the error_idx is just set to whatever control
227  * Find the controls in the control array and do some basic checks.
240 		struct v4l2_ext_control *c = &cs->controls[i];  in prepare_ext_ctrls()
258 		 * Old-style private controls are not allowed for  in prepare_ext_ctrls()
259 		 * extended controls.  in prepare_ext_ctrls()
263 				"old-style private controls not allowed\n");  in prepare_ext_ctrls()
345 	 * We are done if there were no controls that belong to a multi-  in prepare_ext_ctrls()
352 	 * The code below figures out in O(n) time which controls in the list  in prepare_ext_ctrls()
392  * whether there are any controls at all.
403  * Get extended controls. Allocates the helpers array if needed.
407  * completed, and in that case p_req_valid is true for all controls.
466 		 * volatile controls at the time of request completion  in v4l2_g_ext_ctrls_common()
493 				ret = def_to_user(cs->controls + idx, ref->ctrl);  in v4l2_g_ext_ctrls_common()
497 				ret = req_to_user(cs->controls + idx, ref);  in v4l2_g_ext_ctrls_common()
499 				ret = min_to_user(cs->controls + idx, ref->ctrl);  in v4l2_g_ext_ctrls_common()
501 				ret = max_to_user(cs->controls + idx, ref->ctrl);  in v4l2_g_ext_ctrls_common()
503 				ret = new_to_user(cs->controls + idx, ref->ctrl);  in v4l2_g_ext_ctrls_common()
505 				ret = cur_to_user(cs->controls + idx, ref->ctrl);  in v4l2_g_ext_ctrls_common()
533 /* Validate controls. */
560 		 * controls may have been set already and we want to do a  in validate_ctrls()
576 			p_new.p_s64 = &cs->controls[i].value64;  in validate_ctrls()
578 			p_new.p_s32 = &cs->controls[i].value;  in validate_ctrls()
586 /* Try or try-and-set controls */
652 		 * of controls).  in try_set_ext_ctrls_common()
666 					new_auto_val = cs->controls[tmp_idx].value;  in try_set_ext_ctrls_common()
684 			ret = user_to_new(cs->controls + idx, ctrl);  in try_set_ext_ctrls_common()
711 				ret = new_to_user(cs->controls + idx,  in try_set_ext_ctrls_common()
774 	/* Compound controls are not supported. The new_to_user() and  in get_ctrl()
882  * Helper functions for drivers to get/set controls.