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