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