Subversion Repositories test_project

/*

 *  acpi_fan.c - ACPI Fan Driver ($Revision: 29 $)

 *

 *  Copyright (C) 2001, 2002 Andy Grover <andrew.grover@intel.com>

 *  Copyright (C) 2001, 2002 Paul Diefenbaugh <paul.s.diefenbaugh@intel.com>

 *

 * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

 *

 *  This program is free software; you can redistribute it and/or modify

 *  it under the terms of the GNU General Public License as published by

 *  the Free Software Foundation; either version 2 of the License, or (at

 *  your option) any later version.

 *

 *  This program is distributed in the hope that it will be useful, but

 *  WITHOUT ANY WARRANTY; without even the implied warranty of

 *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU

 *  General Public License for more details.

 *

 *  You should have received a copy of the GNU General Public License along

 *  with this program; if not, write to the Free Software Foundation, Inc.,

 *  59 Temple Place, Suite 330, Boston, MA 02111-1307 USA.

 *

 * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

 */

#include <linux/kernel.h>

#include <linux/module.h>

#include <linux/init.h>

#include <linux/types.h>

#include <linux/proc_fs.h>

#include <linux/seq_file.h>

#include <asm/uaccess.h>

#include <acpi/acpi_bus.h>

#include <acpi/acpi_drivers.h>

#define ACPI_FAN_COMPONENT              0x00200000

#define ACPI_FAN_CLASS                  "fan"

#define ACPI_FAN_FILE_STATE             "state"

#define _COMPONENT              ACPI_FAN_COMPONENT

ACPI_MODULE_NAME("fan");

MODULE_AUTHOR("Paul Diefenbaugh");

MODULE_DESCRIPTION("ACPI Fan Driver");

MODULE_LICENSE("GPL");

static int acpi_fan_add(struct acpi_device *device);

static int acpi_fan_remove(struct acpi_device *device, int type);

static int acpi_fan_suspend(struct acpi_device *device, pm_message_t state);

static int acpi_fan_resume(struct acpi_device *device);

static const struct acpi_device_id fan_device_ids[] = {

        {"PNP0C0B", 0},

        {"", 0},

};

MODULE_DEVICE_TABLE(acpi, fan_device_ids);

static struct acpi_driver acpi_fan_driver = {

        .name = "fan",

        .class = ACPI_FAN_CLASS,

        .ids = fan_device_ids,

        .ops = {

                .add = acpi_fan_add,

                .remove = acpi_fan_remove,

                .suspend = acpi_fan_suspend,

                .resume = acpi_fan_resume,

                },

};

/* --------------------------------------------------------------------------

                              FS Interface (/proc)

   -------------------------------------------------------------------------- */

static struct proc_dir_entry *acpi_fan_dir;

static int acpi_fan_read_state(struct seq_file *seq, void *offset)

{

        struct acpi_device *device = seq->private;

        int state = 0;

        if (device) {

                if (acpi_bus_get_power(device->handle, &state))

                        seq_printf(seq, "status:                  ERROR\n");

                else

                        seq_printf(seq, "status:                  %s\n",

                                   !state ? "on" : "off");

        }

        return 0;

}

static int acpi_fan_state_open_fs(struct inode *inode, struct file *file)

{

        return single_open(file, acpi_fan_read_state, PDE(inode)->data);

}

static ssize_t

acpi_fan_write_state(struct file *file, const char __user * buffer,

                     size_t count, loff_t * ppos)

{

        int result = 0;

        struct seq_file *m = file->private_data;

        struct acpi_device *device = m->private;

        char state_string[12] = { '\0' };

        if (count > sizeof(state_string) - 1)

                return -EINVAL;

        if (copy_from_user(state_string, buffer, count))

                return -EFAULT;

        state_string[count] = '\0';

        result = acpi_bus_set_power(device->handle,

                                    simple_strtoul(state_string, NULL, 0));

        if (result)

                return result;

        return count;

}

static const struct file_operations acpi_fan_state_ops = {

        .open = acpi_fan_state_open_fs,

        .read = seq_read,

        .write = acpi_fan_write_state,

        .llseek = seq_lseek,

        .release = single_release,

        .owner = THIS_MODULE,

};

static int acpi_fan_add_fs(struct acpi_device *device)

{

        struct proc_dir_entry *entry = NULL;

        if (!device)

                return -EINVAL;

        if (!acpi_device_dir(device)) {

                acpi_device_dir(device) = proc_mkdir(acpi_device_bid(device),

                                                     acpi_fan_dir);

                if (!acpi_device_dir(device))

                        return -ENODEV;

                acpi_device_dir(device)->owner = THIS_MODULE;

        }

        /* 'status' [R/W] */

        entry = create_proc_entry(ACPI_FAN_FILE_STATE,

                                  S_IFREG | S_IRUGO | S_IWUSR,

                                  acpi_device_dir(device));

        if (!entry)

                return -ENODEV;

        else {

                entry->proc_fops = &acpi_fan_state_ops;

                entry->data = device;

                entry->owner = THIS_MODULE;

        }

        return 0;

}

static int acpi_fan_remove_fs(struct acpi_device *device)

{

        if (acpi_device_dir(device)) {

                remove_proc_entry(ACPI_FAN_FILE_STATE, acpi_device_dir(device));

                remove_proc_entry(acpi_device_bid(device), acpi_fan_dir);

                acpi_device_dir(device) = NULL;

        }

        return 0;

}

/* --------------------------------------------------------------------------

                                 Driver Interface

   -------------------------------------------------------------------------- */

static int acpi_fan_add(struct acpi_device *device)

{

        int result = 0;

        struct acpi_fan *fan = NULL;

        int state = 0;

        if (!device)

                return -EINVAL;

        strcpy(acpi_device_name(device), "Fan");

        strcpy(acpi_device_class(device), ACPI_FAN_CLASS);

        result = acpi_bus_get_power(device->handle, &state);

        if (result) {

                printk(KERN_ERR PREFIX "Reading power state\n");

                goto end;

        }

        device->flags.force_power_state = 1;

        acpi_bus_set_power(device->handle, state);

        device->flags.force_power_state = 0;

        result = acpi_fan_add_fs(device);

        if (result)

                goto end;

        printk(KERN_INFO PREFIX "%s [%s] (%s)\n",

               acpi_device_name(device), acpi_device_bid(device),

               !device->power.state ? "on" : "off");

      end:

        if (result)

                kfree(fan);

        return result;

}

static int acpi_fan_remove(struct acpi_device *device, int type)

{

        if (!device || !acpi_driver_data(device))

                return -EINVAL;

        acpi_fan_remove_fs(device);

        return 0;

}

static int acpi_fan_suspend(struct acpi_device *device, pm_message_t state)

{

        if (!device)

                return -EINVAL;

        acpi_bus_set_power(device->handle, ACPI_STATE_D0);

        return AE_OK;

}

static int acpi_fan_resume(struct acpi_device *device)

{

        int result = 0;

        int power_state = 0;

        if (!device)

                return -EINVAL;

        result = acpi_bus_get_power(device->handle, &power_state);

        if (result) {

                ACPI_DEBUG_PRINT((ACPI_DB_ERROR,

                                  "Error reading fan power state\n"));

                return result;

        }

        device->flags.force_power_state = 1;

        acpi_bus_set_power(device->handle, power_state);

        device->flags.force_power_state = 0;

        return result;

}

static int __init acpi_fan_init(void)

{

        int result = 0;

        acpi_fan_dir = proc_mkdir(ACPI_FAN_CLASS, acpi_root_dir);

        if (!acpi_fan_dir)

                return -ENODEV;

        acpi_fan_dir->owner = THIS_MODULE;

        result = acpi_bus_register_driver(&acpi_fan_driver);

        if (result < 0) {

                remove_proc_entry(ACPI_FAN_CLASS, acpi_root_dir);

                return -ENODEV;

        }

        return 0;

}

static void __exit acpi_fan_exit(void)

{

        acpi_bus_unregister_driver(&acpi_fan_driver);

        remove_proc_entry(ACPI_FAN_CLASS, acpi_root_dir);

        return;

}

module_init(acpi_fan_init);

module_exit(acpi_fan_exit);