1 | /* $NetBSD: nouveau_subdev_therm_fantog.c,v 1.1.1.1 2014/08/06 12:36:32 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 | |
27 | #include <sys/cdefs.h> |
28 | __KERNEL_RCSID(0, "$NetBSD: nouveau_subdev_therm_fantog.c,v 1.1.1.1 2014/08/06 12:36:32 riastradh Exp $" ); |
29 | |
30 | #include "priv.h" |
31 | |
32 | #include <core/object.h> |
33 | #include <core/device.h> |
34 | |
35 | #include <subdev/gpio.h> |
36 | #include <subdev/timer.h> |
37 | |
38 | struct nouveau_fantog_priv { |
39 | struct nouveau_fan base; |
40 | struct nouveau_alarm alarm; |
41 | spinlock_t lock; |
42 | u32 period_us; |
43 | u32 percent; |
44 | struct dcb_gpio_func func; |
45 | }; |
46 | |
47 | static void |
48 | nouveau_fantog_update(struct nouveau_fantog_priv *priv, int percent) |
49 | { |
50 | struct nouveau_therm_priv *tpriv = (void *)priv->base.parent; |
51 | struct nouveau_timer *ptimer = nouveau_timer(tpriv); |
52 | struct nouveau_gpio *gpio = nouveau_gpio(tpriv); |
53 | unsigned long flags; |
54 | int duty; |
55 | |
56 | spin_lock_irqsave(&priv->lock, flags); |
57 | if (percent < 0) |
58 | percent = priv->percent; |
59 | priv->percent = percent; |
60 | |
61 | duty = !gpio->get(gpio, 0, DCB_GPIO_FAN, 0xff); |
62 | gpio->set(gpio, 0, DCB_GPIO_FAN, 0xff, duty); |
63 | |
64 | if (list_empty(&priv->alarm.head) && percent != (duty * 100)) { |
65 | u64 next_change = (percent * priv->period_us) / 100; |
66 | if (!duty) |
67 | next_change = priv->period_us - next_change; |
68 | ptimer->alarm(ptimer, next_change * 1000, &priv->alarm); |
69 | } |
70 | spin_unlock_irqrestore(&priv->lock, flags); |
71 | } |
72 | |
73 | static void |
74 | nouveau_fantog_alarm(struct nouveau_alarm *alarm) |
75 | { |
76 | struct nouveau_fantog_priv *priv = |
77 | container_of(alarm, struct nouveau_fantog_priv, alarm); |
78 | nouveau_fantog_update(priv, -1); |
79 | } |
80 | |
81 | static int |
82 | nouveau_fantog_get(struct nouveau_therm *therm) |
83 | { |
84 | struct nouveau_therm_priv *tpriv = (void *)therm; |
85 | struct nouveau_fantog_priv *priv = (void *)tpriv->fan; |
86 | return priv->percent; |
87 | } |
88 | |
89 | static int |
90 | nouveau_fantog_set(struct nouveau_therm *therm, int percent) |
91 | { |
92 | struct nouveau_therm_priv *tpriv = (void *)therm; |
93 | struct nouveau_fantog_priv *priv = (void *)tpriv->fan; |
94 | if (therm->pwm_ctrl) |
95 | therm->pwm_ctrl(therm, priv->func.line, false); |
96 | nouveau_fantog_update(priv, percent); |
97 | return 0; |
98 | } |
99 | |
100 | int |
101 | nouveau_fantog_create(struct nouveau_therm *therm, struct dcb_gpio_func *func) |
102 | { |
103 | struct nouveau_therm_priv *tpriv = (void *)therm; |
104 | struct nouveau_fantog_priv *priv; |
105 | int ret; |
106 | |
107 | if (therm->pwm_ctrl) { |
108 | ret = therm->pwm_ctrl(therm, func->line, false); |
109 | if (ret) |
110 | return ret; |
111 | } |
112 | |
113 | priv = kzalloc(sizeof(*priv), GFP_KERNEL); |
114 | tpriv->fan = &priv->base; |
115 | if (!priv) |
116 | return -ENOMEM; |
117 | |
118 | priv->base.type = "toggle" ; |
119 | priv->base.get = nouveau_fantog_get; |
120 | priv->base.set = nouveau_fantog_set; |
121 | nouveau_alarm_init(&priv->alarm, nouveau_fantog_alarm); |
122 | priv->period_us = 100000; /* 10Hz */ |
123 | priv->percent = 100; |
124 | priv->func = *func; |
125 | spin_lock_init(&priv->lock); |
126 | return 0; |
127 | } |
128 | |