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loop_names[loop_id], control ? control->name : "uninitialized value");/* * Windfarm PowerMac thermal control. iMac G5 iSight * * (c) Copyright 2007 Étienne Bersac <bersace@gmail.com> * * Bits & pieces from windfarm_pm81.c by (c) Copyright 2005 Benjamin * Herrenschmidt, IBM Corp. <benh@kernel.crashing.org> * * Released under the term of the GNU GPL v2. * * * * PowerMac12,1 * ============ * * * The algorithm used is the PID control algorithm, used the same way * the published Darwin code does, using the same values that are * present in the Darwin 8.10 snapshot property lists (note however * that none of the code has been re-used, it's a complete * re-implementation * * There is two models using PowerMac12,1. Model 2 is iMac G5 iSight * 17" while Model 3 is iMac G5 20". They do have both the same * controls with a tiny difference. The control-ids of hard-drive-fan * and cpu-fan is swapped. * * * Target Correction : * * controls have a target correction calculated as : * * new_min = ((((average_power * slope) >> 16) + offset) >> 16) + min_value * new_value = max(new_value, max(new_min, 0)) * * OD Fan control correction. * * # model_id: 2 * offset : -19563152 * slope : 1956315 * * # model_id: 3 * offset : -15650652 * slope : 1565065 * * HD Fan control correction. * * # model_id: 2 * offset : -15650652 * slope : 1565065 * * # model_id: 3 * offset : -19563152 * slope : 1956315 * * CPU Fan control correction. * * # model_id: 2 * offset : -25431900 * slope : 2543190 * * # model_id: 3 * offset : -15650652 * slope : 1565065 * * * Target rubber-banding : * * Some controls have a target correction which depends on another * control value. The correction is computed in the following way : * * new_min = ref_value * slope + offset * * ref_value is the value of the reference control. If new_min is * greater than 0, then we correct the target value using : * * new_target = max (new_target, new_min >> 16) * * * # model_id : 2 * control : cpu-fan * ref : optical-drive-fan * offset : -15650652 * slope : 1565065 * * # model_id : 3 * control : optical-drive-fan * ref : hard-drive-fan * offset : -32768000 * slope : 65536 * *