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
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
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
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 	therm->fan = &fan->base;
102 	if (!fan)
103 		return -ENOMEM;
104 
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