/*
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* Copyright 2012 The Nouveau community
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*
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* Permission is hereby granted, free of charge, to any person obtaining a
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* copy of this software and associated documentation files (the "Software"),
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* to deal in the Software without restriction, including without limitation
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* the rights to use, copy, modify, merge, publish, distribute, sublicense,
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* and/or sell copies of the Software, and to permit persons to whom the
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* Software is furnished to do so, subject to the following conditions:
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*
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* The above copyright notice and this permission notice shall be included in
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* all copies or substantial portions of the Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
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* THE COPYRIGHT HOLDER(S) OR AUTHOR(S) BE LIABLE FOR ANY CLAIM, DAMAGES OR
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* OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
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* ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
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* OTHER DEALINGS IN THE SOFTWARE.
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*
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* Authors: Martin Peres
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*/
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#include "priv.h"
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#include <subdev/gpio.h>
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#include <subdev/timer.h>
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struct nvkm_fantog {
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struct nvkm_fan base;
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struct nvkm_alarm alarm;
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spinlock_t lock;
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u32 period_us;
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u32 percent;
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struct dcb_gpio_func func;
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};
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static void
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nvkm_fantog_update(struct nvkm_fantog *fan, int percent)
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{
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struct nvkm_therm *therm = fan->base.parent;
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struct nvkm_device *device = therm->subdev.device;
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struct nvkm_timer *tmr = device->timer;
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struct nvkm_gpio *gpio = device->gpio;
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unsigned long flags;
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int duty;
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spin_lock_irqsave(&fan->lock, flags);
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if (percent < 0)
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percent = fan->percent;
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fan->percent = percent;
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duty = !nvkm_gpio_get(gpio, 0, DCB_GPIO_FAN, 0xff);
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nvkm_gpio_set(gpio, 0, DCB_GPIO_FAN, 0xff, duty);
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if (percent != (duty * 100)) {
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u64 next_change = (percent * fan->period_us) / 100;
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if (!duty)
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next_change = fan->period_us - next_change;
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nvkm_timer_alarm(tmr, next_change * 1000, &fan->alarm);
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}
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spin_unlock_irqrestore(&fan->lock, flags);
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}
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static void
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nvkm_fantog_alarm(struct nvkm_alarm *alarm)
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{
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struct nvkm_fantog *fan =
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container_of(alarm, struct nvkm_fantog, alarm);
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nvkm_fantog_update(fan, -1);
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}
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static int
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nvkm_fantog_get(struct nvkm_therm *therm)
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{
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struct nvkm_fantog *fan = (void *)therm->fan;
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return fan->percent;
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}
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static int
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nvkm_fantog_set(struct nvkm_therm *therm, int percent)
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{
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struct nvkm_fantog *fan = (void *)therm->fan;
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if (therm->func->pwm_ctrl)
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therm->func->pwm_ctrl(therm, fan->func.line, false);
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nvkm_fantog_update(fan, percent);
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return 0;
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}
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int
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nvkm_fantog_create(struct nvkm_therm *therm, struct dcb_gpio_func *func)
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{
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struct nvkm_fantog *fan;
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int ret;
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if (therm->func->pwm_ctrl) {
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ret = therm->func->pwm_ctrl(therm, func->line, false);
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if (ret)
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return ret;
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}
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fan = kzalloc(sizeof(*fan), GFP_KERNEL);
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therm->fan = &fan->base;
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if (!fan)
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return -ENOMEM;
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fan->base.type = "toggle";
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fan->base.get = nvkm_fantog_get;
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fan->base.set = nvkm_fantog_set;
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nvkm_alarm_init(&fan->alarm, nvkm_fantog_alarm);
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fan->period_us = 100000; /* 10Hz */
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fan->percent = 100;
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fan->func = *func;
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spin_lock_init(&fan->lock);
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return 0;
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}
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