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
29struct 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
38static void
39nvkm_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
64static void
65nvkm_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
72static int
73nvkm_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
80static int
81nvkm_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
91int
92nvkm_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