| 1 | /* $NetBSD: nouveau_subdev_therm_fantog.c,v 1.1.1.1 2014/08/06 12:36:32 riastradh Exp $ */ |
| 2 | |
| 3 | /* |
| 4 | * Copyright 2012 The Nouveau community |
| 5 | * |
| 6 | * Permission is hereby granted, free of charge, to any person obtaining a |
| 7 | * copy of this software and associated documentation files (the "Software"), |
| 8 | * to deal in the Software without restriction, including without limitation |
| 9 | * the rights to use, copy, modify, merge, publish, distribute, sublicense, |
| 10 | * and/or sell copies of the Software, and to permit persons to whom the |
| 11 | * Software is furnished to do so, subject to the following conditions: |
| 12 | * |
| 13 | * The above copyright notice and this permission notice shall be included in |
| 14 | * all copies or substantial portions of the Software. |
| 15 | * |
| 16 | * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR |
| 17 | * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, |
| 18 | * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL |
| 19 | * THE COPYRIGHT HOLDER(S) OR AUTHOR(S) BE LIABLE FOR ANY CLAIM, DAMAGES OR |
| 20 | * OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, |
| 21 | * ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR |
| 22 | * OTHER DEALINGS IN THE SOFTWARE. |
| 23 | * |
| 24 | * Authors: Martin Peres |
| 25 | */ |
| 26 | |
| 27 | #include <sys/cdefs.h> |
| 28 | __KERNEL_RCSID(0, "$NetBSD: nouveau_subdev_therm_fantog.c,v 1.1.1.1 2014/08/06 12:36:32 riastradh Exp $" ); |
| 29 | |
| 30 | #include "priv.h" |
| 31 | |
| 32 | #include <core/object.h> |
| 33 | #include <core/device.h> |
| 34 | |
| 35 | #include <subdev/gpio.h> |
| 36 | #include <subdev/timer.h> |
| 37 | |
| 38 | struct nouveau_fantog_priv { |
| 39 | struct nouveau_fan base; |
| 40 | struct nouveau_alarm alarm; |
| 41 | spinlock_t lock; |
| 42 | u32 period_us; |
| 43 | u32 percent; |
| 44 | struct dcb_gpio_func func; |
| 45 | }; |
| 46 | |
| 47 | static void |
| 48 | nouveau_fantog_update(struct nouveau_fantog_priv *priv, int percent) |
| 49 | { |
| 50 | struct nouveau_therm_priv *tpriv = (void *)priv->base.parent; |
| 51 | struct nouveau_timer *ptimer = nouveau_timer(tpriv); |
| 52 | struct nouveau_gpio *gpio = nouveau_gpio(tpriv); |
| 53 | unsigned long flags; |
| 54 | int duty; |
| 55 | |
| 56 | spin_lock_irqsave(&priv->lock, flags); |
| 57 | if (percent < 0) |
| 58 | percent = priv->percent; |
| 59 | priv->percent = percent; |
| 60 | |
| 61 | duty = !gpio->get(gpio, 0, DCB_GPIO_FAN, 0xff); |
| 62 | gpio->set(gpio, 0, DCB_GPIO_FAN, 0xff, duty); |
| 63 | |
| 64 | if (list_empty(&priv->alarm.head) && percent != (duty * 100)) { |
| 65 | u64 next_change = (percent * priv->period_us) / 100; |
| 66 | if (!duty) |
| 67 | next_change = priv->period_us - next_change; |
| 68 | ptimer->alarm(ptimer, next_change * 1000, &priv->alarm); |
| 69 | } |
| 70 | spin_unlock_irqrestore(&priv->lock, flags); |
| 71 | } |
| 72 | |
| 73 | static void |
| 74 | nouveau_fantog_alarm(struct nouveau_alarm *alarm) |
| 75 | { |
| 76 | struct nouveau_fantog_priv *priv = |
| 77 | container_of(alarm, struct nouveau_fantog_priv, alarm); |
| 78 | nouveau_fantog_update(priv, -1); |
| 79 | } |
| 80 | |
| 81 | static int |
| 82 | nouveau_fantog_get(struct nouveau_therm *therm) |
| 83 | { |
| 84 | struct nouveau_therm_priv *tpriv = (void *)therm; |
| 85 | struct nouveau_fantog_priv *priv = (void *)tpriv->fan; |
| 86 | return priv->percent; |
| 87 | } |
| 88 | |
| 89 | static int |
| 90 | nouveau_fantog_set(struct nouveau_therm *therm, int percent) |
| 91 | { |
| 92 | struct nouveau_therm_priv *tpriv = (void *)therm; |
| 93 | struct nouveau_fantog_priv *priv = (void *)tpriv->fan; |
| 94 | if (therm->pwm_ctrl) |
| 95 | therm->pwm_ctrl(therm, priv->func.line, false); |
| 96 | nouveau_fantog_update(priv, percent); |
| 97 | return 0; |
| 98 | } |
| 99 | |
| 100 | int |
| 101 | nouveau_fantog_create(struct nouveau_therm *therm, struct dcb_gpio_func *func) |
| 102 | { |
| 103 | struct nouveau_therm_priv *tpriv = (void *)therm; |
| 104 | struct nouveau_fantog_priv *priv; |
| 105 | int ret; |
| 106 | |
| 107 | if (therm->pwm_ctrl) { |
| 108 | ret = therm->pwm_ctrl(therm, func->line, false); |
| 109 | if (ret) |
| 110 | return ret; |
| 111 | } |
| 112 | |
| 113 | priv = kzalloc(sizeof(*priv), GFP_KERNEL); |
| 114 | tpriv->fan = &priv->base; |
| 115 | if (!priv) |
| 116 | return -ENOMEM; |
| 117 | |
| 118 | priv->base.type = "toggle" ; |
| 119 | priv->base.get = nouveau_fantog_get; |
| 120 | priv->base.set = nouveau_fantog_set; |
| 121 | nouveau_alarm_init(&priv->alarm, nouveau_fantog_alarm); |
| 122 | priv->period_us = 100000; /* 10Hz */ |
| 123 | priv->percent = 100; |
| 124 | priv->func = *func; |
| 125 | spin_lock_init(&priv->lock); |
| 126 | return 0; |
| 127 | } |
| 128 | |