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_priv {
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_priv * priv,int percent)39 nvkm_fantog_update(struct nvkm_fantog_priv *priv, int percent)
40 {
41 struct nvkm_therm_priv *tpriv = (void *)priv->base.parent;
42 struct nvkm_timer *ptimer = nvkm_timer(tpriv);
43 struct nvkm_gpio *gpio = nvkm_gpio(tpriv);
44 unsigned long flags;
45 int duty;
46
47 spin_lock_irqsave(&priv->lock, flags);
48 if (percent < 0)
49 percent = priv->percent;
50 priv->percent = percent;
51
52 duty = !gpio->get(gpio, 0, DCB_GPIO_FAN, 0xff);
53 gpio->set(gpio, 0, DCB_GPIO_FAN, 0xff, duty);
54
55 if (list_empty(&priv->alarm.head) && percent != (duty * 100)) {
56 u64 next_change = (percent * priv->period_us) / 100;
57 if (!duty)
58 next_change = priv->period_us - next_change;
59 ptimer->alarm(ptimer, next_change * 1000, &priv->alarm);
60 }
61 spin_unlock_irqrestore(&priv->lock, flags);
62 }
63
64 static void
nvkm_fantog_alarm(struct nvkm_alarm * alarm)65 nvkm_fantog_alarm(struct nvkm_alarm *alarm)
66 {
67 struct nvkm_fantog_priv *priv =
68 container_of(alarm, struct nvkm_fantog_priv, alarm);
69 nvkm_fantog_update(priv, -1);
70 }
71
72 static int
nvkm_fantog_get(struct nvkm_therm * therm)73 nvkm_fantog_get(struct nvkm_therm *therm)
74 {
75 struct nvkm_therm_priv *tpriv = (void *)therm;
76 struct nvkm_fantog_priv *priv = (void *)tpriv->fan;
77 return priv->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_therm_priv *tpriv = (void *)therm;
84 struct nvkm_fantog_priv *priv = (void *)tpriv->fan;
85 if (therm->pwm_ctrl)
86 therm->pwm_ctrl(therm, priv->func.line, false);
87 nvkm_fantog_update(priv, percent);
88 return 0;
89 }
90
91 int
nvkm_fantog_create(struct nvkm_therm * therm,struct dcb_gpio_func * func)92 nvkm_fantog_create(struct nvkm_therm *therm, struct dcb_gpio_func *func)
93 {
94 struct nvkm_therm_priv *tpriv = (void *)therm;
95 struct nvkm_fantog_priv *priv;
96 int ret;
97
98 if (therm->pwm_ctrl) {
99 ret = therm->pwm_ctrl(therm, func->line, false);
100 if (ret)
101 return ret;
102 }
103
104 priv = kzalloc(sizeof(*priv), GFP_KERNEL);
105 tpriv->fan = &priv->base;
106 if (!priv)
107 return -ENOMEM;
108
109 priv->base.type = "toggle";
110 priv->base.get = nvkm_fantog_get;
111 priv->base.set = nvkm_fantog_set;
112 nvkm_alarm_init(&priv->alarm, nvkm_fantog_alarm);
113 priv->period_us = 100000; /* 10Hz */
114 priv->percent = 100;
115 priv->func = *func;
116 spin_lock_init(&priv->lock);
117 return 0;
118 }
119