3  * V4L2 controls framework uAPI implementation:
164  * multiple controls have to be set through multiple i2c writes (for example)
171  * error should be returned without actually affecting any controls.
179  * controls were affected. Otherwise all controls before that index were
181  * the given index failed, and you don't know what happened with the controls
192  * tried to set the controls. In all other cases it is a driver/hardware
196  * never modifies controls the error_idx is just set to whatever control
202  * Find the controls in the control array and do some basic checks.
215 		struct v4l2_ext_control *c = &cs->controls[i];  in prepare_ext_ctrls()
233 		 * Old-style private controls are not allowed for  in prepare_ext_ctrls()
234 		 * extended controls.  in prepare_ext_ctrls()
238 				"old-style private controls not allowed\n");  in prepare_ext_ctrls()
287 	 * We are done if there were no controls that belong to a multi-  in prepare_ext_ctrls()
294 	 * The code below figures out in O(n) time which controls in the list  in prepare_ext_ctrls()
334  * whether there are any controls at all.
345  * Get extended controls. Allocates the helpers array if needed.
349  * completed, and in that case valid_p_req is true for all controls.
405 		 * volatile controls at the time of request completion  in v4l2_g_ext_ctrls_common()
432 				ret = def_to_user(cs->controls + idx, ref->ctrl);  in v4l2_g_ext_ctrls_common()
434 				ret = req_to_user(cs->controls + idx, ref);  in v4l2_g_ext_ctrls_common()
436 				ret = new_to_user(cs->controls + idx, ref->ctrl);  in v4l2_g_ext_ctrls_common()
438 				ret = cur_to_user(cs->controls + idx, ref->ctrl);  in v4l2_g_ext_ctrls_common()
460 /* Validate controls. */
487 		 * controls may have been set already and we want to do a  in validate_ctrls()
503 			p_new.p_s64 = &cs->controls[i].value64;  in validate_ctrls()
505 			p_new.p_s32 = &cs->controls[i].value;  in validate_ctrls()
513 /* Try or try-and-set controls */
577 		 * of controls).  in try_set_ext_ctrls_common()
591 					new_auto_val = cs->controls[tmp_idx].value;  in try_set_ext_ctrls_common()
609 			ret = user_to_new(cs->controls + idx, ctrl);  in try_set_ext_ctrls_common()
636 				ret = new_to_user(cs->controls + idx,  in try_set_ext_ctrls_common()
699 	/* Compound controls are not supported. The new_to_user() and  in get_ctrl()
802  * Helper functions for drivers to get/set controls.