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
25#include "priv.h"
26
27#include <core/object.h>
28#include <core/device.h>
29
30#include <subdev/gpio.h>
31#include <subdev/timer.h>
32
33struct nouveau_fantog_priv {
34	struct nouveau_fan base;
35	struct nouveau_alarm alarm;
36	spinlock_t lock;
37	u32 period_us;
38	u32 percent;
39	struct dcb_gpio_func func;
40};
41
42static void
43nouveau_fantog_update(struct nouveau_fantog_priv *priv, int percent)
44{
45	struct nouveau_therm_priv *tpriv = (void *)priv->base.parent;
46	struct nouveau_timer *ptimer = nouveau_timer(tpriv);
47	struct nouveau_gpio *gpio = nouveau_gpio(tpriv);
48	unsigned long flags;
49	int duty;
50
51	spin_lock_irqsave(&priv->lock, flags);
52	if (percent < 0)
53		percent = priv->percent;
54	priv->percent = percent;
55
56	duty = !gpio->get(gpio, 0, DCB_GPIO_FAN, 0xff);
57	gpio->set(gpio, 0, DCB_GPIO_FAN, 0xff, duty);
58
59	if (list_empty(&priv->alarm.head) && percent != (duty * 100)) {
60		u64 next_change = (percent * priv->period_us) / 100;
61		if (!duty)
62			next_change = priv->period_us - next_change;
63		ptimer->alarm(ptimer, next_change * 1000, &priv->alarm);
64	}
65	spin_unlock_irqrestore(&priv->lock, flags);
66}
67
68static void
69nouveau_fantog_alarm(struct nouveau_alarm *alarm)
70{
71	struct nouveau_fantog_priv *priv =
72	       container_of(alarm, struct nouveau_fantog_priv, alarm);
73	nouveau_fantog_update(priv, -1);
74}
75
76static int
77nouveau_fantog_get(struct nouveau_therm *therm)
78{
79	struct nouveau_therm_priv *tpriv = (void *)therm;
80	struct nouveau_fantog_priv *priv = (void *)tpriv->fan;
81	return priv->percent;
82}
83
84static int
85nouveau_fantog_set(struct nouveau_therm *therm, int percent)
86{
87	struct nouveau_therm_priv *tpriv = (void *)therm;
88	struct nouveau_fantog_priv *priv = (void *)tpriv->fan;
89	if (therm->pwm_ctrl)
90		therm->pwm_ctrl(therm, priv->func.line, false);
91	nouveau_fantog_update(priv, percent);
92	return 0;
93}
94
95int
96nouveau_fantog_create(struct nouveau_therm *therm, struct dcb_gpio_func *func)
97{
98	struct nouveau_therm_priv *tpriv = (void *)therm;
99	struct nouveau_fantog_priv *priv;
100	int ret;
101
102	if (therm->pwm_ctrl) {
103		ret = therm->pwm_ctrl(therm, func->line, false);
104		if (ret)
105			return ret;
106	}
107
108	priv = kzalloc(sizeof(*priv), GFP_KERNEL);
109	tpriv->fan = &priv->base;
110	if (!priv)
111		return -ENOMEM;
112
113	priv->base.type = "toggle";
114	priv->base.get = nouveau_fantog_get;
115	priv->base.set = nouveau_fantog_set;
116	nouveau_alarm_init(&priv->alarm, nouveau_fantog_alarm);
117	priv->period_us = 100000; /* 10Hz */
118	priv->percent = 100;
119	priv->func = *func;
120	spin_lock_init(&priv->lock);
121	return 0;
122}
123