2  * Windfarm PowerMac thermal control. iMac G5 iSight
17  * The algorithm used is the PID control algorithm, used the same way
25  * controls with a tiny difference. The control-ids of hard-drive-fan
36  * OD Fan control correction.
46  * HD Fan control correction.
56  * CPU Fan control correction.
70  * control value. The correction is computed in the following way :
74  * ref_value is the value of the reference control. If new_min is
81  *   control	: cpu-fan
87  *   control	: optical-drive-fan
98  * The various control loops found in Darwin config file are:
100  * HD Fan control loop.
103  *   control        : hard-drive-fan
113  *   control        : hard-drive-fan
122  * OD Fan control loop.
125  *   control        : optical-drive-fan
135  *   control        : optical-drive-fan
144  * GPU Fan control loop.
147  *   control        : hard-drive-fan
157  *   control        : cpu-fan
166  * KODIAK (aka northbridge) Fan control loop.
169  *   control        : optical-drive-fan
179  *   control        : hard-drive-fan
188  * CPU Fan control loop.
190  *   control        : cpu-fan
195  * CPU Slew control loop.
197  *   control        : cpufreq-clamp
249 /* Set to kick the control loop into life */
261 	LOOP_GPU,		/* control = hd or cpu, but luckily,
263 	LOOP_HD,		/* control = hd */
264 	LOOP_KODIAK,		/* control = hd or od */
265 	LOOP_OD,		/* control = od */
351  * ****** System Fans Control Loop ******
355 /* Since each loop handles only one control and we want to avoid
356  * writing virtual control, we store the control correction with the
370 	/* GPU Fan control loop */
385 	/* HD Fan control loop */
400 	/* KODIAK Fan control loop */
415 	/* OD Fan control loop */
438 /* State data used by the system fans control loop
449  * ****** CPU Fans Control Loop ******
455 /* State data used by the cpu fans control loop
521 	struct wf_control *control = NULL;  in pm121_create_sys_fans()  local
540 	control = controls[param->control_id];  in pm121_create_sys_fans()
558 	pid_param.min		= control->ops->get_min(control);  in pm121_create_sys_fans()
559 	pid_param.max		= control->ops->get_max(control);  in pm121_create_sys_fans()
563 	pr_debug("pm121: %s Fan control loop initialized.\n"  in pm121_create_sys_fans()
571 	   control the same control */  in pm121_create_sys_fans()
574 	       loop_names[loop_id], control->name);  in pm121_create_sys_fans()
576 	if (control)  in pm121_create_sys_fans()
577 		wf_control_set_max(control);  in pm121_create_sys_fans()
585 	struct wf_control *control;  in pm121_sys_fans_tick()  local
592 	control = controls[param->control_id];  in pm121_sys_fans_tick()
626 		 control->name, (int)new_setpoint);  in pm121_sys_fans_tick()
628 	if (control && pm121_failure_state == 0) {  in pm121_sys_fans_tick()
629 		rc = control->ops->set_value(control, st->setpoint);  in pm121_sys_fans_tick()
632 			       control->name, rc);  in pm121_sys_fans_tick()
681 		       "CPU control loop (%d)\n", piddata->history_len);  in pm121_create_cpu_fans()
701 	pr_debug("pm121: CPU Fan control initialized.\n");  in pm121_create_cpu_fans()
794 		pr_debug("pm121: creating control loops !\n");  in pm121_tick()
856 	 * the control loop levels, but we don't want to keep it clear  in pm121_tick()
942 		pr_debug("pm121: new control %s detected\n",  in pm121_notify()
1038 MODULE_DESCRIPTION("Thermal control logic for iMac G5 (iSight)");