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 | |