1 /* 2 * Copyright 2012 The Nouveau community 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: Martin Peres 23 */ 24 #include "priv.h" 25 26 #include <subdev/gpio.h> 27 #include <subdev/timer.h> 28 29 struct nvkm_fantog { 30 struct nvkm_fan base; 31 struct nvkm_alarm alarm; 32 spinlock_t lock; 33 u32 period_us; 34 u32 percent; 35 struct dcb_gpio_func func; 36 }; 37 38 static void 39 nvkm_fantog_update(struct nvkm_fantog *fan, int percent) 40 { 41 struct nvkm_therm *therm = fan->base.parent; 42 struct nvkm_device *device = therm->subdev.device; 43 struct nvkm_timer *tmr = device->timer; 44 struct nvkm_gpio *gpio = device->gpio; 45 unsigned long flags; 46 int duty; 47 48 spin_lock_irqsave(&fan->lock, flags); 49 if (percent < 0) 50 percent = fan->percent; 51 fan->percent = percent; 52 53 duty = !nvkm_gpio_get(gpio, 0, DCB_GPIO_FAN, 0xff); 54 nvkm_gpio_set(gpio, 0, DCB_GPIO_FAN, 0xff, duty); 55 56 if (percent != (duty * 100)) { 57 u64 next_change = (percent * fan->period_us) / 100; 58 if (!duty) 59 next_change = fan->period_us - next_change; 60 nvkm_timer_alarm(tmr, next_change * 1000, &fan->alarm); 61 } 62 spin_unlock_irqrestore(&fan->lock, flags); 63 } 64 65 static void 66 nvkm_fantog_alarm(struct nvkm_alarm *alarm) 67 { 68 struct nvkm_fantog *fan = 69 container_of(alarm, struct nvkm_fantog, alarm); 70 nvkm_fantog_update(fan, -1); 71 } 72 73 static int 74 nvkm_fantog_get(struct nvkm_therm *therm) 75 { 76 struct nvkm_fantog *fan = (void *)therm->fan; 77 return fan->percent; 78 } 79 80 static int 81 nvkm_fantog_set(struct nvkm_therm *therm, int percent) 82 { 83 struct nvkm_fantog *fan = (void *)therm->fan; 84 if (therm->func->pwm_ctrl) 85 therm->func->pwm_ctrl(therm, fan->func.line, false); 86 nvkm_fantog_update(fan, percent); 87 return 0; 88 } 89 90 int 91 nvkm_fantog_create(struct nvkm_therm *therm, struct dcb_gpio_func *func) 92 { 93 struct nvkm_fantog *fan; 94 int ret; 95 96 if (therm->func->pwm_ctrl) { 97 ret = therm->func->pwm_ctrl(therm, func->line, false); 98 if (ret) 99 return ret; 100 } 101 102 fan = kzalloc(sizeof(*fan), GFP_KERNEL); 103 if (!fan) 104 return -ENOMEM; 105 106 therm->fan = &fan->base; 107 fan->base.type = "toggle"; 108 fan->base.get = nvkm_fantog_get; 109 fan->base.set = nvkm_fantog_set; 110 nvkm_alarm_init(&fan->alarm, nvkm_fantog_alarm); 111 fan->period_us = 100000; /* 10Hz */ 112 fan->percent = 100; 113 fan->func = *func; 114 spin_lock_init(&fan->lock); 115 return 0; 116 } 117