303 lines
7.1 KiB
C
303 lines
7.1 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 <linux/proc_fs.h>
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#include <linux/seq_file.h>
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#include <asm/uaccess.h>
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#include <acpi/acpi_bus.h>
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#include <acpi/acpi_drivers.h>
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#define ACPI_FAN_COMPONENT 0x00200000
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#define ACPI_FAN_CLASS "fan"
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#define ACPI_FAN_DRIVER_NAME "ACPI Fan Driver"
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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_NAME);
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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, int type);
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static int acpi_fan_suspend(struct acpi_device *device, pm_message_t state);
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static int acpi_fan_resume(struct acpi_device *device);
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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 = "PNP0C0B",
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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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.suspend = acpi_fan_suspend,
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.resume = acpi_fan_resume,
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},
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};
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struct acpi_fan {
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struct acpi_device * device;
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};
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/* --------------------------------------------------------------------------
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FS Interface (/proc)
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-------------------------------------------------------------------------- */
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static struct proc_dir_entry *acpi_fan_dir;
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static int acpi_fan_read_state(struct seq_file *seq, void *offset)
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{
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struct acpi_fan *fan = seq->private;
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int state = 0;
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if (fan) {
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if (acpi_bus_get_power(fan->device->handle, &state))
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seq_printf(seq, "status: ERROR\n");
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else
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seq_printf(seq, "status: %s\n",
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!state ? "on" : "off");
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}
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return 0;
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}
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static int acpi_fan_state_open_fs(struct inode *inode, struct file *file)
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{
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return single_open(file, acpi_fan_read_state, PDE(inode)->data);
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}
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static ssize_t
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acpi_fan_write_state(struct file *file, const char __user * buffer,
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size_t count, loff_t * ppos)
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{
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int result = 0;
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struct seq_file *m = file->private_data;
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struct acpi_fan *fan = m->private;
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char state_string[12] = { '\0' };
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if (!fan || (count > sizeof(state_string) - 1))
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return -EINVAL;
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if (copy_from_user(state_string, buffer, count))
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return -EFAULT;
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state_string[count] = '\0';
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result = acpi_bus_set_power(fan->device->handle,
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simple_strtoul(state_string, NULL, 0));
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if (result)
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return result;
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return count;
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}
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static const struct file_operations acpi_fan_state_ops = {
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.open = acpi_fan_state_open_fs,
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.read = seq_read,
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.write = acpi_fan_write_state,
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.llseek = seq_lseek,
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.release = single_release,
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.owner = THIS_MODULE,
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};
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static int acpi_fan_add_fs(struct acpi_device *device)
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{
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struct proc_dir_entry *entry = NULL;
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if (!device)
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return -EINVAL;
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if (!acpi_device_dir(device)) {
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acpi_device_dir(device) = proc_mkdir(acpi_device_bid(device),
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acpi_fan_dir);
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if (!acpi_device_dir(device))
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return -ENODEV;
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acpi_device_dir(device)->owner = THIS_MODULE;
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}
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/* 'status' [R/W] */
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entry = create_proc_entry(ACPI_FAN_FILE_STATE,
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S_IFREG | S_IRUGO | S_IWUSR,
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acpi_device_dir(device));
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if (!entry)
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return -ENODEV;
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else {
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entry->proc_fops = &acpi_fan_state_ops;
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entry->data = acpi_driver_data(device);
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entry->owner = THIS_MODULE;
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}
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return 0;
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}
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static int acpi_fan_remove_fs(struct acpi_device *device)
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{
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if (acpi_device_dir(device)) {
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remove_proc_entry(ACPI_FAN_FILE_STATE, acpi_device_dir(device));
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remove_proc_entry(acpi_device_bid(device), acpi_fan_dir);
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acpi_device_dir(device) = NULL;
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}
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return 0;
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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 acpi_fan *fan = NULL;
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int state = 0;
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if (!device)
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return -EINVAL;
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fan = kzalloc(sizeof(struct acpi_fan), GFP_KERNEL);
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if (!fan)
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return -ENOMEM;
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fan->device = device;
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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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acpi_driver_data(device) = fan;
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result = acpi_bus_get_power(device->handle, &state);
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if (result) {
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printk(KERN_ERR PREFIX "Reading power state\n");
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goto end;
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}
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device->flags.force_power_state = 1;
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acpi_bus_set_power(device->handle, state);
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device->flags.force_power_state = 0;
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result = acpi_fan_add_fs(device);
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if (result)
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goto end;
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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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if (result)
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kfree(fan);
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return result;
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}
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static int acpi_fan_remove(struct acpi_device *device, int type)
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{
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struct acpi_fan *fan = NULL;
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if (!device || !acpi_driver_data(device))
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return -EINVAL;
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fan = acpi_driver_data(device);
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acpi_fan_remove_fs(device);
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kfree(fan);
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return 0;
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}
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static int acpi_fan_suspend(struct acpi_device *device, pm_message_t state)
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{
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if (!device)
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return -EINVAL;
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acpi_bus_set_power(device->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 acpi_device *device)
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{
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int result = 0;
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int power_state = 0;
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if (!device)
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return -EINVAL;
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result = acpi_bus_get_power(device->handle, &power_state);
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if (result) {
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ACPI_DEBUG_PRINT((ACPI_DB_ERROR,
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"Error reading fan power state\n"));
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return result;
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}
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device->flags.force_power_state = 1;
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acpi_bus_set_power(device->handle, power_state);
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device->flags.force_power_state = 0;
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return result;
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}
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static int __init acpi_fan_init(void)
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{
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int result = 0;
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acpi_fan_dir = proc_mkdir(ACPI_FAN_CLASS, acpi_root_dir);
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if (!acpi_fan_dir)
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return -ENODEV;
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acpi_fan_dir->owner = THIS_MODULE;
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result = acpi_bus_register_driver(&acpi_fan_driver);
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if (result < 0) {
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remove_proc_entry(ACPI_FAN_CLASS, acpi_root_dir);
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return -ENODEV;
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}
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return 0;
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}
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static void __exit acpi_fan_exit(void)
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{
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acpi_bus_unregister_driver(&acpi_fan_driver);
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remove_proc_entry(ACPI_FAN_CLASS, acpi_root_dir);
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return;
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}
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module_init(acpi_fan_init);
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module_exit(acpi_fan_exit);
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