1 /*
2 * Copyright 2012 The Nouveau community
3 *
4 * Permission is hereby granted, free of charge, to any person obtaining a
5 * copy of this software and associated documentation files (the "Software"),
6 * to deal in the Software without restriction, including without limitation
7 * the rights to use, copy, modify, merge, publish, distribute, sublicense,
8 * and/or sell copies of the Software, and to permit persons to whom the
9 * Software is furnished to do so, subject to the following conditions:
10 *
11 * The above copyright notice and this permission notice shall be included in
12 * all copies or substantial portions of the Software.
13 *
14 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
15 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
16 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
17 * THE COPYRIGHT HOLDER(S) OR AUTHOR(S) BE LIABLE FOR ANY CLAIM, DAMAGES OR
18 * OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
19 * ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
20 * OTHER DEALINGS IN THE SOFTWARE.
21 *
22 * Authors: Martin Peres
23 */
24 #include "priv.h"
25
26 #include <subdev/gpio.h>
27 #include <subdev/timer.h>
28
29 struct nvkm_fantog {
30 struct nvkm_fan base;
31 struct nvkm_alarm alarm;
32 spinlock_t lock;
33 u32 period_us;
34 u32 percent;
35 struct dcb_gpio_func func;
36 };
37
38 static void
nvkm_fantog_update(struct nvkm_fantog * fan,int percent)39 nvkm_fantog_update(struct nvkm_fantog *fan, int percent)
40 {
41 struct nvkm_therm *therm = fan->base.parent;
42 struct nvkm_device *device = therm->subdev.device;
43 struct nvkm_timer *tmr = device->timer;
44 struct nvkm_gpio *gpio = device->gpio;
45 unsigned long flags;
46 int duty;
47
48 spin_lock_irqsave(&fan->lock, flags);
49 if (percent < 0)
50 percent = fan->percent;
51 fan->percent = percent;
52
53 duty = !nvkm_gpio_get(gpio, 0, DCB_GPIO_FAN, 0xff);
54 nvkm_gpio_set(gpio, 0, DCB_GPIO_FAN, 0xff, duty);
55
56 if (percent != (duty * 100)) {
57 u64 next_change = (percent * fan->period_us) / 100;
58 if (!duty)
59 next_change = fan->period_us - next_change;
60 nvkm_timer_alarm(tmr, next_change * 1000, &fan->alarm);
61 }
62 spin_unlock_irqrestore(&fan->lock, flags);
63 }
64
65 static void
nvkm_fantog_alarm(struct nvkm_alarm * alarm)66 nvkm_fantog_alarm(struct nvkm_alarm *alarm)
67 {
68 struct nvkm_fantog *fan =
69 container_of(alarm, struct nvkm_fantog, alarm);
70 nvkm_fantog_update(fan, -1);
71 }
72
73 static int
nvkm_fantog_get(struct nvkm_therm * therm)74 nvkm_fantog_get(struct nvkm_therm *therm)
75 {
76 struct nvkm_fantog *fan = (void *)therm->fan;
77 return fan->percent;
78 }
79
80 static int
nvkm_fantog_set(struct nvkm_therm * therm,int percent)81 nvkm_fantog_set(struct nvkm_therm *therm, int percent)
82 {
83 struct nvkm_fantog *fan = (void *)therm->fan;
84 if (therm->func->pwm_ctrl)
85 therm->func->pwm_ctrl(therm, fan->func.line, false);
86 nvkm_fantog_update(fan, percent);
87 return 0;
88 }
89
90 int
nvkm_fantog_create(struct nvkm_therm * therm,struct dcb_gpio_func * func)91 nvkm_fantog_create(struct nvkm_therm *therm, struct dcb_gpio_func *func)
92 {
93 struct nvkm_fantog *fan;
94 int ret;
95
96 if (therm->func->pwm_ctrl) {
97 ret = therm->func->pwm_ctrl(therm, func->line, false);
98 if (ret)
99 return ret;
100 }
101
102 fan = kzalloc(sizeof(*fan), GFP_KERNEL);
103 therm->fan = &fan->base;
104 if (!fan)
105 return -ENOMEM;
106
107 fan->base.type = "toggle";
108 fan->base.get = nvkm_fantog_get;
109 fan->base.set = nvkm_fantog_set;
110 nvkm_alarm_init(&fan->alarm, nvkm_fantog_alarm);
111 fan->period_us = 100000; /* 10Hz */
112 fan->percent = 100;
113 fan->func = *func;
114 spin_lock_init(&fan->lock);
115 return 0;
116 }
117