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 #include "priv.h"
26
27 #include <core/option.h>
28 #include <subdev/bios.h>
29 #include <subdev/bios/fan.h>
30 #include <subdev/gpio.h>
31
32 struct nvkm_fanpwm {
33 struct nvkm_fan base;
34 struct dcb_gpio_func func;
35 };
36
37 static int
nvkm_fanpwm_get(struct nvkm_therm * therm)38 nvkm_fanpwm_get(struct nvkm_therm *therm)
39 {
40 struct nvkm_fanpwm *fan = (void *)therm->fan;
41 struct nvkm_device *device = therm->subdev.device;
42 struct nvkm_gpio *gpio = device->gpio;
43 int card_type = device->card_type;
44 u32 divs, duty;
45 int ret;
46
47 ret = therm->func->pwm_get(therm, fan->func.line, &divs, &duty);
48 if (ret == 0 && divs) {
49 divs = max(divs, duty);
50 if (card_type <= NV_40 || (fan->func.log[0] & 1))
51 duty = divs - duty;
52 return (duty * 100) / divs;
53 }
54
55 return nvkm_gpio_get(gpio, 0, fan->func.func, fan->func.line) * 100;
56 }
57
58 static int
nvkm_fanpwm_set(struct nvkm_therm * therm,int percent)59 nvkm_fanpwm_set(struct nvkm_therm *therm, int percent)
60 {
61 struct nvkm_fanpwm *fan = (void *)therm->fan;
62 int card_type = therm->subdev.device->card_type;
63 u32 divs, duty;
64 int ret;
65
66 divs = fan->base.perf.pwm_divisor;
67 if (fan->base.bios.pwm_freq) {
68 divs = 1;
69 if (therm->func->pwm_clock)
70 divs = therm->func->pwm_clock(therm, fan->func.line);
71 divs /= fan->base.bios.pwm_freq;
72 }
73
74 duty = ((divs * percent) + 99) / 100;
75 if (card_type <= NV_40 || (fan->func.log[0] & 1))
76 duty = divs - duty;
77
78 ret = therm->func->pwm_set(therm, fan->func.line, divs, duty);
79 if (ret == 0)
80 ret = therm->func->pwm_ctrl(therm, fan->func.line, true);
81 return ret;
82 }
83
84 int
nvkm_fanpwm_create(struct nvkm_therm * therm,struct dcb_gpio_func * func)85 nvkm_fanpwm_create(struct nvkm_therm *therm, struct dcb_gpio_func *func)
86 {
87 struct nvkm_device *device = therm->subdev.device;
88 struct nvkm_bios *bios = device->bios;
89 struct nvkm_fanpwm *fan;
90 struct nvbios_therm_fan info = {};
91 u32 divs, duty;
92
93 nvbios_fan_parse(bios, &info);
94
95 if (!nvkm_boolopt(device->cfgopt, "NvFanPWM", func->param) ||
96 !therm->func->pwm_ctrl || info.type == NVBIOS_THERM_FAN_TOGGLE ||
97 therm->func->pwm_get(therm, func->line, &divs, &duty) == -ENODEV)
98 return -ENODEV;
99
100 fan = kzalloc(sizeof(*fan), GFP_KERNEL);
101 if (!fan)
102 return -ENOMEM;
103
104 therm->fan = &fan->base;
105 fan->base.type = "PWM";
106 fan->base.get = nvkm_fanpwm_get;
107 fan->base.set = nvkm_fanpwm_set;
108 fan->func = *func;
109 return 0;
110 }
111