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/*
* Copyright 2012 Red Hat Inc.
*
* 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: Ben Skeggs
* Martin Peres
*/
#include "priv.h"
#include <core/device.h>
#include <core/option.h>
#include <subdev/bios.h>
#include <subdev/bios/fan.h>
#include <subdev/gpio.h>
struct nvkm_fanpwm_priv {
struct nvkm_fan base;
struct dcb_gpio_func func;
};
static int
nvkm_fanpwm_get(struct nvkm_therm *therm)
{
struct nvkm_therm_priv *tpriv = (void *)therm;
struct nvkm_fanpwm_priv *priv = (void *)tpriv->fan;
struct nvkm_gpio *gpio = nvkm_gpio(therm);
int card_type = nv_device(therm)->card_type;
u32 divs, duty;
int ret;
ret = therm->pwm_get(therm, priv->func.line, &divs, &duty);
if (ret == 0 && divs) {
divs = max(divs, duty);
if (card_type <= NV_40 || (priv->func.log[0] & 1))
duty = divs - duty;
return (duty * 100) / divs;
}
return gpio->get(gpio, 0, priv->func.func, priv->func.line) * 100;
}
static int
nvkm_fanpwm_set(struct nvkm_therm *therm, int percent)
{
struct nvkm_therm_priv *tpriv = (void *)therm;
struct nvkm_fanpwm_priv *priv = (void *)tpriv->fan;
int card_type = nv_device(therm)->card_type;
u32 divs, duty;
int ret;
divs = priv->base.perf.pwm_divisor;
if (priv->base.bios.pwm_freq) {
divs = 1;
if (therm->pwm_clock)
divs = therm->pwm_clock(therm, priv->func.line);
divs /= priv->base.bios.pwm_freq;
}
duty = ((divs * percent) + 99) / 100;
if (card_type <= NV_40 || (priv->func.log[0] & 1))
duty = divs - duty;
ret = therm->pwm_set(therm, priv->func.line, divs, duty);
if (ret == 0)
ret = therm->pwm_ctrl(therm, priv->func.line, true);
return ret;
}
int
nvkm_fanpwm_create(struct nvkm_therm *therm, struct dcb_gpio_func *func)
{
struct nvkm_device *device = nv_device(therm);
struct nvkm_therm_priv *tpriv = (void *)therm;
struct nvkm_bios *bios = nvkm_bios(therm);
struct nvkm_fanpwm_priv *priv;
struct nvbios_therm_fan fan;
u32 divs, duty;
nvbios_fan_parse(bios, &fan);
if (!nvkm_boolopt(device->cfgopt, "NvFanPWM", func->param) ||
!therm->pwm_ctrl || fan.type == NVBIOS_THERM_FAN_TOGGLE ||
therm->pwm_get(therm, func->line, &divs, &duty) == -ENODEV)
return -ENODEV;
priv = kzalloc(sizeof(*priv), GFP_KERNEL);
tpriv->fan = &priv->base;
if (!priv)
return -ENOMEM;
priv->base.type = "PWM";
priv->base.get = nvkm_fanpwm_get;
priv->base.set = nvkm_fanpwm_set;
priv->func = *func;
return 0;
}
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