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