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1/*2 * Copyright 2012 The Nouveau community3 *4 * Permission is hereby granted, free of charge, to any person obtaining a5 * copy of this software and associated documentation files (the "Software"),6 * to deal in the Software without restriction, including without limitation7 * the rights to use, copy, modify, merge, publish, distribute, sublicense,8 * and/or sell copies of the Software, and to permit persons to whom the9 * Software is furnished to do so, subject to the following conditions:10 *11 * The above copyright notice and this permission notice shall be included in12 * all copies or substantial portions of the Software.13 *14 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR15 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,16 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL17 * THE COPYRIGHT HOLDER(S) OR AUTHOR(S) BE LIABLE FOR ANY CLAIM, DAMAGES OR18 * 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 OR20 * OTHER DEALINGS IN THE SOFTWARE.21 *22 * Authors: Martin Peres23 */24#include "priv.h"25 26#include <subdev/gpio.h>27#include <subdev/timer.h>28 29struct nvkm_fantog {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 void39nvkm_fantog_update(struct nvkm_fantog *fan, int percent)40{41 struct nvkm_therm *therm = fan->base.parent;42 struct nvkm_device *device = therm->subdev.device;43 struct nvkm_timer *tmr = device->timer;44 struct nvkm_gpio *gpio = device->gpio;45 unsigned long flags;46 int duty;47 48 spin_lock_irqsave(&fan->lock, flags);49 if (percent < 0)50 percent = fan->percent;51 fan->percent = percent;52 53 duty = !nvkm_gpio_get(gpio, 0, DCB_GPIO_FAN, 0xff);54 nvkm_gpio_set(gpio, 0, DCB_GPIO_FAN, 0xff, duty);55 56 if (percent != (duty * 100)) {57 u64 next_change = (percent * fan->period_us) / 100;58 if (!duty)59 next_change = fan->period_us - next_change;60 nvkm_timer_alarm(tmr, next_change * 1000, &fan->alarm);61 }62 spin_unlock_irqrestore(&fan->lock, flags);63}64 65static void66nvkm_fantog_alarm(struct nvkm_alarm *alarm)67{68 struct nvkm_fantog *fan =69 container_of(alarm, struct nvkm_fantog, alarm);70 nvkm_fantog_update(fan, -1);71}72 73static int74nvkm_fantog_get(struct nvkm_therm *therm)75{76 struct nvkm_fantog *fan = (void *)therm->fan;77 return fan->percent;78}79 80static int81nvkm_fantog_set(struct nvkm_therm *therm, int percent)82{83 struct nvkm_fantog *fan = (void *)therm->fan;84 if (therm->func->pwm_ctrl)85 therm->func->pwm_ctrl(therm, fan->func.line, false);86 nvkm_fantog_update(fan, percent);87 return 0;88}89 90int91nvkm_fantog_create(struct nvkm_therm *therm, struct dcb_gpio_func *func)92{93 struct nvkm_fantog *fan;94 int ret;95 96 if (therm->func->pwm_ctrl) {97 ret = therm->func->pwm_ctrl(therm, func->line, false);98 if (ret)99 return ret;100 }101 102 fan = kzalloc(sizeof(*fan), GFP_KERNEL);103 if (!fan)104 return -ENOMEM;105 106 therm->fan = &fan->base;107 fan->base.type = "toggle";108 fan->base.get = nvkm_fantog_get;109 fan->base.set = nvkm_fantog_set;110 nvkm_alarm_init(&fan->alarm, nvkm_fantog_alarm);111 fan->period_us = 100000; /* 10Hz */112 fan->percent = 100;113 fan->func = *func;114 spin_lock_init(&fan->lock);115 return 0;116}117