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/device.h> 28 #include <core/option.h> 29 #include <subdev/bios.h> 30 #include <subdev/bios/fan.h> 31 #include <subdev/gpio.h> 32 33 struct nvkm_fanpwm_priv { 34 struct nvkm_fan base; 35 struct dcb_gpio_func func; 36 }; 37 38 static int 39 nvkm_fanpwm_get(struct nvkm_therm *therm) 40 { 41 struct nvkm_therm_priv *tpriv = (void *)therm; 42 struct nvkm_fanpwm_priv *priv = (void *)tpriv->fan; 43 struct nvkm_gpio *gpio = nvkm_gpio(therm); 44 int card_type = nv_device(therm)->card_type; 45 u32 divs, duty; 46 int ret; 47 48 ret = therm->pwm_get(therm, priv->func.line, &divs, &duty); 49 if (ret == 0 && divs) { 50 divs = max(divs, duty); 51 if (card_type <= NV_40 || (priv->func.log[0] & 1)) 52 duty = divs - duty; 53 return (duty * 100) / divs; 54 } 55 56 return gpio->get(gpio, 0, priv->func.func, priv->func.line) * 100; 57 } 58 59 static int 60 nvkm_fanpwm_set(struct nvkm_therm *therm, int percent) 61 { 62 struct nvkm_therm_priv *tpriv = (void *)therm; 63 struct nvkm_fanpwm_priv *priv = (void *)tpriv->fan; 64 int card_type = nv_device(therm)->card_type; 65 u32 divs, duty; 66 int ret; 67 68 divs = priv->base.perf.pwm_divisor; 69 if (priv->base.bios.pwm_freq) { 70 divs = 1; 71 if (therm->pwm_clock) 72 divs = therm->pwm_clock(therm, priv->func.line); 73 divs /= priv->base.bios.pwm_freq; 74 } 75 76 duty = ((divs * percent) + 99) / 100; 77 if (card_type <= NV_40 || (priv->func.log[0] & 1)) 78 duty = divs - duty; 79 80 ret = therm->pwm_set(therm, priv->func.line, divs, duty); 81 if (ret == 0) 82 ret = therm->pwm_ctrl(therm, priv->func.line, true); 83 return ret; 84 } 85 86 int 87 nvkm_fanpwm_create(struct nvkm_therm *therm, struct dcb_gpio_func *func) 88 { 89 struct nvkm_device *device = nv_device(therm); 90 struct nvkm_therm_priv *tpriv = (void *)therm; 91 struct nvkm_bios *bios = nvkm_bios(therm); 92 struct nvkm_fanpwm_priv *priv; 93 struct nvbios_therm_fan fan; 94 u32 divs, duty; 95 96 nvbios_fan_parse(bios, &fan); 97 98 if (!nvkm_boolopt(device->cfgopt, "NvFanPWM", func->param) || 99 !therm->pwm_ctrl || fan.type == NVBIOS_THERM_FAN_TOGGLE || 100 therm->pwm_get(therm, func->line, &divs, &duty) == -ENODEV) 101 return -ENODEV; 102 103 priv = kzalloc(sizeof(*priv), GFP_KERNEL); 104 tpriv->fan = &priv->base; 105 if (!priv) 106 return -ENOMEM; 107 108 priv->base.type = "PWM"; 109 priv->base.get = nvkm_fanpwm_get; 110 priv->base.set = nvkm_fanpwm_set; 111 priv->func = *func; 112 return 0; 113 } 114