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