2 * Copyright 2012 Red Hat Inc.
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:
11 * The above copyright notice and this permission notice shall be included in
12 * all copies or substantial portions of the Software.
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.
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>
33 struct nvkm_fanpwm_priv {
35 struct dcb_gpio_func func;
39 nvkm_fanpwm_get(struct nvkm_therm *therm)
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;
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))
53 return (duty * 100) / divs;
56 return gpio->get(gpio, 0, priv->func.func, priv->func.line) * 100;
60 nvkm_fanpwm_set(struct nvkm_therm *therm, int percent)
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;
68 divs = priv->base.perf.pwm_divisor;
69 if (priv->base.bios.pwm_freq) {
72 divs = therm->pwm_clock(therm, priv->func.line);
73 divs /= priv->base.bios.pwm_freq;
76 duty = ((divs * percent) + 99) / 100;
77 if (card_type <= NV_40 || (priv->func.log[0] & 1))
80 ret = therm->pwm_set(therm, priv->func.line, divs, duty);
82 ret = therm->pwm_ctrl(therm, priv->func.line, true);
87 nvkm_fanpwm_create(struct nvkm_therm *therm, struct dcb_gpio_func *func)
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;
96 nvbios_fan_parse(bios, &fan);
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)
103 priv = kzalloc(sizeof(*priv), GFP_KERNEL);
104 tpriv->fan = &priv->base;
108 priv->base.type = "PWM";
109 priv->base.get = nvkm_fanpwm_get;
110 priv->base.set = nvkm_fanpwm_set;