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 *obj) 39 { 40 struct nvkm_therm_priv *therm = container_of(obj, typeof(*therm), base); 41 struct nvkm_fanpwm *fan = (void *)therm->fan; 42 struct nvkm_device *device = therm->base.subdev.device; 43 struct nvkm_gpio *gpio = device->gpio; 44 int card_type = device->card_type; 45 u32 divs, duty; 46 int ret; 47 48 ret = therm->base.pwm_get(&therm->base, fan->func.line, &divs, &duty); 49 if (ret == 0 && divs) { 50 divs = max(divs, duty); 51 if (card_type <= NV_40 || (fan->func.log[0] & 1)) 52 duty = divs - duty; 53 return (duty * 100) / divs; 54 } 55 56 return nvkm_gpio_get(gpio, 0, fan->func.func, fan->func.line) * 100; 57 } 58 59 static int 60 nvkm_fanpwm_set(struct nvkm_therm *obj, int percent) 61 { 62 struct nvkm_therm_priv *therm = container_of(obj, typeof(*therm), base); 63 struct nvkm_fanpwm *fan = (void *)therm->fan; 64 int card_type = nv_device(therm)->card_type; 65 u32 divs, duty; 66 int ret; 67 68 divs = fan->base.perf.pwm_divisor; 69 if (fan->base.bios.pwm_freq) { 70 divs = 1; 71 if (therm->base.pwm_clock) 72 divs = therm->base.pwm_clock(&therm->base, 73 fan->func.line); 74 divs /= fan->base.bios.pwm_freq; 75 } 76 77 duty = ((divs * percent) + 99) / 100; 78 if (card_type <= NV_40 || (fan->func.log[0] & 1)) 79 duty = divs - duty; 80 81 ret = therm->base.pwm_set(&therm->base, fan->func.line, divs, duty); 82 if (ret == 0) 83 ret = therm->base.pwm_ctrl(&therm->base, fan->func.line, true); 84 return ret; 85 } 86 87 int 88 nvkm_fanpwm_create(struct nvkm_therm *obj, struct dcb_gpio_func *func) 89 { 90 struct nvkm_therm_priv *therm = container_of(obj, typeof(*therm), base); 91 struct nvkm_device *device = therm->base.subdev.device; 92 struct nvkm_bios *bios = device->bios; 93 struct nvkm_fanpwm *fan; 94 struct nvbios_therm_fan info; 95 u32 divs, duty; 96 97 nvbios_fan_parse(bios, &info); 98 99 if (!nvkm_boolopt(device->cfgopt, "NvFanPWM", func->param) || 100 !therm->base.pwm_ctrl || info.type == NVBIOS_THERM_FAN_TOGGLE || 101 therm->base.pwm_get(&therm->base, func->line, &divs, &duty) == -ENODEV) 102 return -ENODEV; 103 104 fan = kzalloc(sizeof(*fan), GFP_KERNEL); 105 therm->fan = &fan->base; 106 if (!fan) 107 return -ENOMEM; 108 109 fan->base.type = "PWM"; 110 fan->base.get = nvkm_fanpwm_get; 111 fan->base.set = nvkm_fanpwm_set; 112 fan->func = *func; 113 return 0; 114 } 115