1 /* $NetBSD: nouveau_nvkm_subdev_therm_fantog.c,v 1.4 2021/12/19 11:34:46 riastradh Exp $ */
2
3 /*
4 * Copyright 2012 The Nouveau community
5 *
6 * Permission is hereby granted, free of charge, to any person obtaining a
7 * copy of this software and associated documentation files (the "Software"),
8 * to deal in the Software without restriction, including without limitation
9 * the rights to use, copy, modify, merge, publish, distribute, sublicense,
10 * and/or sell copies of the Software, and to permit persons to whom the
11 * Software is furnished to do so, subject to the following conditions:
12 *
13 * The above copyright notice and this permission notice shall be included in
14 * all copies or substantial portions of the Software.
15 *
16 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
17 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
18 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
19 * THE COPYRIGHT HOLDER(S) OR AUTHOR(S) BE LIABLE FOR ANY CLAIM, DAMAGES OR
20 * OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
21 * ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
22 * OTHER DEALINGS IN THE SOFTWARE.
23 *
24 * Authors: Martin Peres
25 */
26 #include <sys/cdefs.h>
27 __KERNEL_RCSID(0, "$NetBSD: nouveau_nvkm_subdev_therm_fantog.c,v 1.4 2021/12/19 11:34:46 riastradh Exp $");
28
29 #include "priv.h"
30
31 #include <subdev/gpio.h>
32 #include <subdev/timer.h>
33
34 struct nvkm_fantog {
35 struct nvkm_fan base;
36 struct nvkm_alarm alarm;
37 spinlock_t lock;
38 u32 period_us;
39 u32 percent;
40 struct dcb_gpio_func func;
41 };
42
43 static void
nvkm_fantog_update(struct nvkm_fantog * fan,int percent)44 nvkm_fantog_update(struct nvkm_fantog *fan, int percent)
45 {
46 struct nvkm_therm *therm = fan->base.parent;
47 struct nvkm_device *device = therm->subdev.device;
48 struct nvkm_timer *tmr = device->timer;
49 struct nvkm_gpio *gpio = device->gpio;
50 unsigned long flags;
51 int duty;
52
53 spin_lock_irqsave(&fan->lock, flags);
54 if (percent < 0)
55 percent = fan->percent;
56 fan->percent = percent;
57
58 duty = !nvkm_gpio_get(gpio, 0, DCB_GPIO_FAN, 0xff);
59 nvkm_gpio_set(gpio, 0, DCB_GPIO_FAN, 0xff, duty);
60
61 if (percent != (duty * 100)) {
62 u64 next_change = (percent * fan->period_us) / 100;
63 if (!duty)
64 next_change = fan->period_us - next_change;
65 nvkm_timer_alarm(tmr, next_change * 1000, &fan->alarm);
66 }
67 spin_unlock_irqrestore(&fan->lock, flags);
68 }
69
70 static void
nvkm_fantog_alarm(struct nvkm_alarm * alarm)71 nvkm_fantog_alarm(struct nvkm_alarm *alarm)
72 {
73 struct nvkm_fantog *fan =
74 container_of(alarm, struct nvkm_fantog, alarm);
75 nvkm_fantog_update(fan, -1);
76 }
77
78 static int
nvkm_fantog_get(struct nvkm_therm * therm)79 nvkm_fantog_get(struct nvkm_therm *therm)
80 {
81 struct nvkm_fantog *fan = (void *)therm->fan;
82 return fan->percent;
83 }
84
85 static int
nvkm_fantog_set(struct nvkm_therm * therm,int percent)86 nvkm_fantog_set(struct nvkm_therm *therm, int percent)
87 {
88 struct nvkm_fantog *fan = (void *)therm->fan;
89 if (therm->func->pwm_ctrl)
90 therm->func->pwm_ctrl(therm, fan->func.line, false);
91 nvkm_fantog_update(fan, percent);
92 return 0;
93 }
94
95 static void
nvkm_fantog_dtor(struct nvkm_fan * base)96 nvkm_fantog_dtor(struct nvkm_fan *base)
97 {
98 struct nvkm_fantog *fan = container_of(base, struct nvkm_fantog, base);
99 spin_lock_destroy(&fan->lock);
100 }
101
102 int
nvkm_fantog_create(struct nvkm_therm * therm,struct dcb_gpio_func * func)103 nvkm_fantog_create(struct nvkm_therm *therm, struct dcb_gpio_func *func)
104 {
105 struct nvkm_fantog *fan;
106 int ret;
107
108 if (therm->func->pwm_ctrl) {
109 ret = therm->func->pwm_ctrl(therm, func->line, false);
110 if (ret)
111 return ret;
112 }
113
114 fan = kzalloc(sizeof(*fan), GFP_KERNEL);
115 therm->fan = &fan->base;
116 if (!fan)
117 return -ENOMEM;
118
119 fan->base.type = "toggle";
120 fan->base.get = nvkm_fantog_get;
121 fan->base.set = nvkm_fantog_set;
122 fan->base.dtor = nvkm_fantog_dtor;
123 nvkm_alarm_init(&fan->alarm, nvkm_fantog_alarm);
124 fan->period_us = 100000; /* 10Hz */
125 fan->percent = 100;
126 fan->func = *func;
127 spin_lock_init(&fan->lock);
128 return 0;
129 }
130