mirror of https://gitee.com/openkylin/linux.git
220 lines
5.4 KiB
C
220 lines
5.4 KiB
C
/*
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* acpi_fan.c - ACPI Fan Driver ($Revision: 29 $)
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*
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* Copyright (C) 2001, 2002 Andy Grover <andrew.grover@intel.com>
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* Copyright (C) 2001, 2002 Paul Diefenbaugh <paul.s.diefenbaugh@intel.com>
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*
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* ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or (at
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* your option) any later version.
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*
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* This program is distributed in the hope that it will be useful, but
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* WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License along
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* with this program; if not, write to the Free Software Foundation, Inc.,
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* 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA.
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*
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* ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
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*/
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#include <linux/kernel.h>
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#include <linux/module.h>
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#include <linux/init.h>
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#include <linux/types.h>
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#include <asm/uaccess.h>
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#include <linux/thermal.h>
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#include <acpi/acpi_bus.h>
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#include <acpi/acpi_drivers.h>
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#define PREFIX "ACPI: "
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#define ACPI_FAN_CLASS "fan"
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#define ACPI_FAN_FILE_STATE "state"
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#define _COMPONENT ACPI_FAN_COMPONENT
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ACPI_MODULE_NAME("fan");
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MODULE_AUTHOR("Paul Diefenbaugh");
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MODULE_DESCRIPTION("ACPI Fan Driver");
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MODULE_LICENSE("GPL");
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static int acpi_fan_add(struct acpi_device *device);
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static int acpi_fan_remove(struct acpi_device *device);
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static const struct acpi_device_id fan_device_ids[] = {
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{"PNP0C0B", 0},
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{"", 0},
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};
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MODULE_DEVICE_TABLE(acpi, fan_device_ids);
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#ifdef CONFIG_PM_SLEEP
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static int acpi_fan_suspend(struct device *dev);
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static int acpi_fan_resume(struct device *dev);
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#endif
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static SIMPLE_DEV_PM_OPS(acpi_fan_pm, acpi_fan_suspend, acpi_fan_resume);
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static struct acpi_driver acpi_fan_driver = {
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.name = "fan",
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.class = ACPI_FAN_CLASS,
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.ids = fan_device_ids,
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.ops = {
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.add = acpi_fan_add,
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.remove = acpi_fan_remove,
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},
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.drv.pm = &acpi_fan_pm,
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};
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/* thermal cooling device callbacks */
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static int fan_get_max_state(struct thermal_cooling_device *cdev, unsigned long
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*state)
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{
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/* ACPI fan device only support two states: ON/OFF */
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*state = 1;
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return 0;
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}
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static int fan_get_cur_state(struct thermal_cooling_device *cdev, unsigned long
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*state)
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{
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struct acpi_device *device = cdev->devdata;
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int result;
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int acpi_state;
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if (!device)
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return -EINVAL;
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result = acpi_bus_update_power(device->handle, &acpi_state);
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if (result)
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return result;
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*state = (acpi_state == ACPI_STATE_D3 ? 0 :
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(acpi_state == ACPI_STATE_D0 ? 1 : -1));
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return 0;
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}
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static int
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fan_set_cur_state(struct thermal_cooling_device *cdev, unsigned long state)
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{
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struct acpi_device *device = cdev->devdata;
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int result;
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if (!device || (state != 0 && state != 1))
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return -EINVAL;
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result = acpi_bus_set_power(device->handle,
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state ? ACPI_STATE_D0 : ACPI_STATE_D3);
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return result;
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}
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static const struct thermal_cooling_device_ops fan_cooling_ops = {
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.get_max_state = fan_get_max_state,
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.get_cur_state = fan_get_cur_state,
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.set_cur_state = fan_set_cur_state,
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};
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/* --------------------------------------------------------------------------
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Driver Interface
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-------------------------------------------------------------------------- */
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static int acpi_fan_add(struct acpi_device *device)
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{
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int result = 0;
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struct thermal_cooling_device *cdev;
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if (!device)
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return -EINVAL;
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strcpy(acpi_device_name(device), "Fan");
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strcpy(acpi_device_class(device), ACPI_FAN_CLASS);
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result = acpi_bus_update_power(device->handle, NULL);
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if (result) {
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printk(KERN_ERR PREFIX "Setting initial power state\n");
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goto end;
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}
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cdev = thermal_cooling_device_register("Fan", device,
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&fan_cooling_ops);
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if (IS_ERR(cdev)) {
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result = PTR_ERR(cdev);
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goto end;
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}
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dev_dbg(&device->dev, "registered as cooling_device%d\n", cdev->id);
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device->driver_data = cdev;
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result = sysfs_create_link(&device->dev.kobj,
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&cdev->device.kobj,
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"thermal_cooling");
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if (result)
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dev_err(&device->dev, "Failed to create sysfs link "
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"'thermal_cooling'\n");
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result = sysfs_create_link(&cdev->device.kobj,
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&device->dev.kobj,
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"device");
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if (result)
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dev_err(&device->dev, "Failed to create sysfs link "
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"'device'\n");
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printk(KERN_INFO PREFIX "%s [%s] (%s)\n",
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acpi_device_name(device), acpi_device_bid(device),
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!device->power.state ? "on" : "off");
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end:
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return result;
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}
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static int acpi_fan_remove(struct acpi_device *device)
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{
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struct thermal_cooling_device *cdev;
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if (!device)
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return -EINVAL;
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cdev = acpi_driver_data(device);
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if (!cdev)
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return -EINVAL;
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sysfs_remove_link(&device->dev.kobj, "thermal_cooling");
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sysfs_remove_link(&cdev->device.kobj, "device");
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thermal_cooling_device_unregister(cdev);
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return 0;
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}
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#ifdef CONFIG_PM_SLEEP
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static int acpi_fan_suspend(struct device *dev)
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{
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if (!dev)
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return -EINVAL;
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acpi_bus_set_power(to_acpi_device(dev)->handle, ACPI_STATE_D0);
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return AE_OK;
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}
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static int acpi_fan_resume(struct device *dev)
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{
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int result;
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if (!dev)
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return -EINVAL;
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result = acpi_bus_update_power(to_acpi_device(dev)->handle, NULL);
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if (result)
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printk(KERN_ERR PREFIX "Error updating fan power state\n");
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return result;
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}
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#endif
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module_acpi_driver(acpi_fan_driver);
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