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