root/drivers/gpu/drm/nouveau/nvkm/subdev/therm/fanpwm.c

DEFINITIONS

1. nvkm_fanpwm_get
2. nvkm_fanpwm_set
3. nvkm_fanpwm_create

   1 /*
   2  * Copyright 2012 Red Hat Inc.
   3  *
   4  * Permission is hereby granted, free of charge, to any person obtaining a
   5  * copy of this software and associated documentation files (the "Software"),
   6  * to deal in the Software without restriction, including without limitation
   7  * the rights to use, copy, modify, merge, publish, distribute, sublicense,
   8  * and/or sell copies of the Software, and to permit persons to whom the
   9  * Software is furnished to do so, subject to the following conditions:
  10  *
  11  * The above copyright notice and this permission notice shall be included in
  12  * all copies or substantial portions of the Software.
  13  *
  14  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
  15  * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
  16  * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
  17  * THE COPYRIGHT HOLDER(S) OR AUTHOR(S) BE LIABLE FOR ANY CLAIM, DAMAGES OR
  18  * OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
  19  * ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
  20  * OTHER DEALINGS IN THE SOFTWARE.
  21  *
  22  * Authors: Ben Skeggs
  23  *          Martin Peres
  24  */
  25 #include "priv.h"
  26 
  27 #include <core/option.h>
  28 #include <subdev/bios.h>
  29 #include <subdev/bios/fan.h>
  30 #include <subdev/gpio.h>
  31 
  32 struct nvkm_fanpwm {
  33         struct nvkm_fan base;
  34         struct dcb_gpio_func func;
  35 };
  36 
  37 static int
  38 nvkm_fanpwm_get(struct nvkm_therm *therm)
  39 {
  40         struct nvkm_fanpwm *fan = (void *)therm->fan;
  41         struct nvkm_device *device = therm->subdev.device;
  42         struct nvkm_gpio *gpio = device->gpio;
  43         int card_type = device->card_type;
  44         u32 divs, duty;
  45         int ret;
  46 
  47         ret = therm->func->pwm_get(therm, fan->func.line, &divs, &duty);
  48         if (ret == 0 && divs) {
  49                 divs = max(divs, duty);
  50                 if (card_type <= NV_40 || (fan->func.log[0] & 1))
  51                         duty = divs - duty;
  52                 return (duty * 100) / divs;
  53         }
  54 
  55         return nvkm_gpio_get(gpio, 0, fan->func.func, fan->func.line) * 100;
  56 }
  57 
  58 static int
  59 nvkm_fanpwm_set(struct nvkm_therm *therm, int percent)
  60 {
  61         struct nvkm_fanpwm *fan = (void *)therm->fan;
  62         int card_type = therm->subdev.device->card_type;
  63         u32 divs, duty;
  64         int ret;
  65 
  66         divs = fan->base.perf.pwm_divisor;
  67         if (fan->base.bios.pwm_freq) {
  68                 divs = 1;
  69                 if (therm->func->pwm_clock)
  70                         divs = therm->func->pwm_clock(therm, fan->func.line);
  71                 divs /= fan->base.bios.pwm_freq;
  72         }
  73 
  74         duty = ((divs * percent) + 99) / 100;
  75         if (card_type <= NV_40 || (fan->func.log[0] & 1))
  76                 duty = divs - duty;
  77 
  78         ret = therm->func->pwm_set(therm, fan->func.line, divs, duty);
  79         if (ret == 0)
  80                 ret = therm->func->pwm_ctrl(therm, fan->func.line, true);
  81         return ret;
  82 }
  83 
  84 int
  85 nvkm_fanpwm_create(struct nvkm_therm *therm, struct dcb_gpio_func *func)
  86 {
  87         struct nvkm_device *device = therm->subdev.device;
  88         struct nvkm_bios *bios = device->bios;
  89         struct nvkm_fanpwm *fan;
  90         struct nvbios_therm_fan info = {};
  91         u32 divs, duty;
  92 
  93         nvbios_fan_parse(bios, &info);
  94 
  95         if (!nvkm_boolopt(device->cfgopt, "NvFanPWM", func->param) ||
  96             !therm->func->pwm_ctrl || info.type == NVBIOS_THERM_FAN_TOGGLE ||
  97              therm->func->pwm_get(therm, func->line, &divs, &duty) == -ENODEV)
  98                 return -ENODEV;
  99 
 100         fan = kzalloc(sizeof(*fan), GFP_KERNEL);
 101         therm->fan = &fan->base;
 102         if (!fan)
 103                 return -ENOMEM;
 104 
 105         fan->base.type = "PWM";
 106         fan->base.get = nvkm_fanpwm_get;
 107         fan->base.set = nvkm_fanpwm_set;
 108         fan->func = *func;
 109         return 0;
 110 }