25 void wf_pid_init(struct wf_pid_state *st, struct wf_pid_param *param)  in wf_pid_init()  argument
27 	memset(st, 0, sizeof(struct wf_pid_state));  in wf_pid_init()
28 	st->param = *param;  in wf_pid_init()
29 	st->first = 1;  in wf_pid_init()
33 s32 wf_pid_run(struct wf_pid_state *st, s32 new_sample)  in wf_pid_run()  argument
37 	int	i, hlen = st->param.history_len;  in wf_pid_run()
40 	error = new_sample - st->param.itarget;  in wf_pid_run()
43 	if (st->first) {  in wf_pid_run()
45 			st->samples[i] = new_sample;  in wf_pid_run()
46 			st->errors[i] = error;  in wf_pid_run()
48 		st->first = 0;  in wf_pid_run()
49 		st->index = 0;  in wf_pid_run()
51 		st->index = (st->index + 1) % hlen;  in wf_pid_run()
52 		st->samples[st->index] = new_sample;  in wf_pid_run()
53 		st->errors[st->index] = error;  in wf_pid_run()
58 		integ += st->errors[(st->index + hlen - i) % hlen];  in wf_pid_run()
59 	integ *= st->param.interval;  in wf_pid_run()
62 	deriv = st->errors[st->index] -  in wf_pid_run()
63 		st->errors[(st->index + hlen - 1) % hlen];  in wf_pid_run()
64 	deriv /= st->param.interval;  in wf_pid_run()
67 	target = (s32)((integ * (s64)st->param.gr + deriv * (s64)st->param.gd +  in wf_pid_run()
68 		  error * (s64)st->param.gp) >> 36);  in wf_pid_run()
69 	if (st->param.additive)  in wf_pid_run()
70 		target += st->target;  in wf_pid_run()
71 	target = max(target, st->param.min);  in wf_pid_run()
72 	target = min(target, st->param.max);  in wf_pid_run()
73 	st->target = target;  in wf_pid_run()
75 	return st->target;  in wf_pid_run()
79 void wf_cpu_pid_init(struct wf_cpu_pid_state *st,  in wf_cpu_pid_init()  argument
82 	memset(st, 0, sizeof(struct wf_cpu_pid_state));  in wf_cpu_pid_init()
83 	st->param = *param;  in wf_cpu_pid_init()
84 	st->first = 1;  in wf_cpu_pid_init()
88 s32 wf_cpu_pid_run(struct wf_cpu_pid_state *st, s32 new_power, s32 new_temp)  in wf_cpu_pid_run()  argument
92 	int	i, hlen = st->param.history_len;  in wf_cpu_pid_run()
95 	error = st->param.pmaxadj - new_power;  in wf_cpu_pid_run()
98 	if (st->first) {  in wf_cpu_pid_run()
100 			st->powers[i] = new_power;  in wf_cpu_pid_run()
101 			st->errors[i] = error;  in wf_cpu_pid_run()
103 		st->temps[0] = st->temps[1] = new_temp;  in wf_cpu_pid_run()
104 		st->first = 0;  in wf_cpu_pid_run()
105 		st->index = st->tindex = 0;  in wf_cpu_pid_run()
107 		st->index = (st->index + 1) % hlen;  in wf_cpu_pid_run()
108 		st->powers[st->index] = new_power;  in wf_cpu_pid_run()
109 		st->errors[st->index] = error;  in wf_cpu_pid_run()
110 		st->tindex = (st->tindex + 1) % 2;  in wf_cpu_pid_run()
111 		st->temps[st->tindex] = new_temp;  in wf_cpu_pid_run()
116 		integ += st->errors[(st->index + hlen - i) % hlen];  in wf_cpu_pid_run()
117 	integ *= st->param.interval;  in wf_cpu_pid_run()
118 	integ *= st->param.gr;  in wf_cpu_pid_run()
119 	sval = st->param.tmax - (s32)(integ >> 20);  in wf_cpu_pid_run()
120 	adj = min(st->param.ttarget, sval);  in wf_cpu_pid_run()
125 	deriv = st->temps[st->tindex] -  in wf_cpu_pid_run()
126 		st->temps[(st->tindex + 2 - 1) % 2];  in wf_cpu_pid_run()
127 	deriv /= st->param.interval;  in wf_cpu_pid_run()
128 	deriv *= st->param.gd;  in wf_cpu_pid_run()
131 	prop = st->last_delta = (new_temp - adj);  in wf_cpu_pid_run()
132 	prop *= st->param.gp;  in wf_cpu_pid_run()
137 	target = st->target + (s32)((deriv + prop) >> 36);  in wf_cpu_pid_run()
138 	target = max(target, st->param.min);  in wf_cpu_pid_run()
139 	target = min(target, st->param.max);  in wf_cpu_pid_run()
140 	st->target = target;  in wf_cpu_pid_run()
142 	return st->target;  in wf_cpu_pid_run()