| 1 | /* $NetBSD: nouveau_subdev_therm_fanpwm.c,v 1.1.1.1 2014/08/06 12:36:32 riastradh Exp $ */ |
| 2 | |
| 3 | /* |
| 4 | * Copyright 2012 Red Hat Inc. |
| 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: Ben Skeggs |
| 25 | * Martin Peres |
| 26 | */ |
| 27 | |
| 28 | #include <sys/cdefs.h> |
| 29 | __KERNEL_RCSID(0, "$NetBSD: nouveau_subdev_therm_fanpwm.c,v 1.1.1.1 2014/08/06 12:36:32 riastradh Exp $" ); |
| 30 | |
| 31 | #include <core/option.h> |
| 32 | #include <subdev/gpio.h> |
| 33 | |
| 34 | #include "priv.h" |
| 35 | |
| 36 | struct nouveau_fanpwm_priv { |
| 37 | struct nouveau_fan base; |
| 38 | struct dcb_gpio_func func; |
| 39 | }; |
| 40 | |
| 41 | static int |
| 42 | nouveau_fanpwm_get(struct nouveau_therm *therm) |
| 43 | { |
| 44 | struct nouveau_therm_priv *tpriv = (void *)therm; |
| 45 | struct nouveau_fanpwm_priv *priv = (void *)tpriv->fan; |
| 46 | struct nouveau_gpio *gpio = nouveau_gpio(therm); |
| 47 | int card_type = nv_device(therm)->card_type; |
| 48 | u32 divs, duty; |
| 49 | int ret; |
| 50 | |
| 51 | ret = therm->pwm_get(therm, priv->func.line, &divs, &duty); |
| 52 | if (ret == 0 && divs) { |
| 53 | divs = max(divs, duty); |
| 54 | if (card_type <= NV_40 || (priv->func.log[0] & 1)) |
| 55 | duty = divs - duty; |
| 56 | return (duty * 100) / divs; |
| 57 | } |
| 58 | |
| 59 | return gpio->get(gpio, 0, priv->func.func, priv->func.line) * 100; |
| 60 | } |
| 61 | |
| 62 | static int |
| 63 | nouveau_fanpwm_set(struct nouveau_therm *therm, int percent) |
| 64 | { |
| 65 | struct nouveau_therm_priv *tpriv = (void *)therm; |
| 66 | struct nouveau_fanpwm_priv *priv = (void *)tpriv->fan; |
| 67 | int card_type = nv_device(therm)->card_type; |
| 68 | u32 divs, duty; |
| 69 | int ret; |
| 70 | |
| 71 | divs = priv->base.perf.pwm_divisor; |
| 72 | if (priv->base.bios.pwm_freq) { |
| 73 | divs = 1; |
| 74 | if (therm->pwm_clock) |
| 75 | divs = therm->pwm_clock(therm, priv->func.line); |
| 76 | divs /= priv->base.bios.pwm_freq; |
| 77 | } |
| 78 | |
| 79 | duty = ((divs * percent) + 99) / 100; |
| 80 | if (card_type <= NV_40 || (priv->func.log[0] & 1)) |
| 81 | duty = divs - duty; |
| 82 | |
| 83 | ret = therm->pwm_set(therm, priv->func.line, divs, duty); |
| 84 | if (ret == 0) |
| 85 | ret = therm->pwm_ctrl(therm, priv->func.line, true); |
| 86 | return ret; |
| 87 | } |
| 88 | |
| 89 | int |
| 90 | nouveau_fanpwm_create(struct nouveau_therm *therm, struct dcb_gpio_func *func) |
| 91 | { |
| 92 | struct nouveau_device *device = nv_device(therm); |
| 93 | struct nouveau_therm_priv *tpriv = (void *)therm; |
| 94 | struct nouveau_fanpwm_priv *priv; |
| 95 | u32 divs, duty; |
| 96 | |
| 97 | if (!nouveau_boolopt(device->cfgopt, "NvFanPWM" , func->param) || |
| 98 | !therm->pwm_ctrl || |
| 99 | therm->pwm_get(therm, func->line, &divs, &duty) == -ENODEV) |
| 100 | return -ENODEV; |
| 101 | |
| 102 | priv = kzalloc(sizeof(*priv), GFP_KERNEL); |
| 103 | tpriv->fan = &priv->base; |
| 104 | if (!priv) |
| 105 | return -ENOMEM; |
| 106 | |
| 107 | priv->base.type = "PWM" ; |
| 108 | priv->base.get = nouveau_fanpwm_get; |
| 109 | priv->base.set = nouveau_fanpwm_set; |
| 110 | priv->func = *func; |
| 111 | return 0; |
| 112 | } |
| 113 | |