media/v4l2-core/v4l2-ctrls-api.c

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];
242 		 * Old-style private controls are not allowed for
243 		 * extended controls.
247 				"old-style private controls not allowed\n");
320 	 * We are done if there were no controls that belong to a multi-
327 	 * The code below figures out in O(n) time which controls in the list
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
465 				ret = def_to_user(cs->controls + idx, ref->ctrl);
469 				ret = req_to_user(cs->controls + idx, ref);
471 				ret = new_to_user(cs->controls + idx, ref->ctrl);
473 				ret = cur_to_user(cs->controls + idx, ref->ctrl);
501 /* Validate controls. */
528 		 * controls may have been set already and we want to do a
544 			p_new.p_s64 = &cs->controls[i].value64;
546 			p_new.p_s32 = &cs->controls[i].value;
554 /* Try or try-and-set controls */
618 		 * of controls).
632 					new_auto_val = cs->controls[tmp_idx].value;
650 			ret = user_to_new(cs->controls + idx, ctrl);
677 				ret = new_to_user(cs->controls + idx,
740 	/* Compound controls are not supported. The new_to_user() and
843  * Helper functions for drivers to get/set controls.