fanpwm.c

  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
 32struct nvkm_fanpwm {
 33	struct nvkm_fan base;
 34	struct dcb_gpio_func func;
 35};
 36
 37static int
 38nvkm_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
 58static int
 59nvkm_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
 84int
 85nvkm_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}