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 if (!fan) 102 return -ENOMEM; 103 104 therm->fan = &fan->base; 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 } 111