![Al Viro](/assets/img/avatar_default.png)
The only part of proc_dir_entry the code outside of fs/proc really cares about is PDE(inode)->data. Provide a helper for that; static inline for now, eventually will be moved to fs/proc, along with the knowledge of struct proc_dir_entry layout. Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
399 lines
9.4 KiB
C
399 lines
9.4 KiB
C
/*
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* acpi_ac.c - ACPI AC Adapter Driver ($Revision: 27 $)
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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/slab.h>
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#include <linux/init.h>
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#include <linux/types.h>
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#ifdef CONFIG_ACPI_PROCFS_POWER
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#include <linux/proc_fs.h>
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#include <linux/seq_file.h>
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#endif
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#include <linux/power_supply.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_AC_CLASS "ac_adapter"
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#define ACPI_AC_DEVICE_NAME "AC Adapter"
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#define ACPI_AC_FILE_STATE "state"
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#define ACPI_AC_NOTIFY_STATUS 0x80
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#define ACPI_AC_STATUS_OFFLINE 0x00
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#define ACPI_AC_STATUS_ONLINE 0x01
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#define ACPI_AC_STATUS_UNKNOWN 0xFF
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#define _COMPONENT ACPI_AC_COMPONENT
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ACPI_MODULE_NAME("ac");
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MODULE_AUTHOR("Paul Diefenbaugh");
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MODULE_DESCRIPTION("ACPI AC Adapter Driver");
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MODULE_LICENSE("GPL");
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#ifdef CONFIG_ACPI_PROCFS_POWER
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extern struct proc_dir_entry *acpi_lock_ac_dir(void);
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extern void *acpi_unlock_ac_dir(struct proc_dir_entry *acpi_ac_dir);
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static int acpi_ac_open_fs(struct inode *inode, struct file *file);
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#endif
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static int acpi_ac_add(struct acpi_device *device);
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static int acpi_ac_remove(struct acpi_device *device);
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static void acpi_ac_notify(struct acpi_device *device, u32 event);
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static const struct acpi_device_id ac_device_ids[] = {
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{"ACPI0003", 0},
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{"", 0},
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};
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MODULE_DEVICE_TABLE(acpi, ac_device_ids);
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#ifdef CONFIG_PM_SLEEP
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static int acpi_ac_resume(struct device *dev);
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#endif
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static SIMPLE_DEV_PM_OPS(acpi_ac_pm, NULL, acpi_ac_resume);
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static struct acpi_driver acpi_ac_driver = {
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.name = "ac",
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.class = ACPI_AC_CLASS,
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.ids = ac_device_ids,
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.flags = ACPI_DRIVER_ALL_NOTIFY_EVENTS,
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.ops = {
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.add = acpi_ac_add,
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.remove = acpi_ac_remove,
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.notify = acpi_ac_notify,
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},
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.drv.pm = &acpi_ac_pm,
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};
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struct acpi_ac {
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struct power_supply charger;
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struct acpi_device * device;
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unsigned long long state;
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};
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#define to_acpi_ac(x) container_of(x, struct acpi_ac, charger)
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#ifdef CONFIG_ACPI_PROCFS_POWER
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static const struct file_operations acpi_ac_fops = {
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.owner = THIS_MODULE,
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.open = acpi_ac_open_fs,
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.read = seq_read,
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.llseek = seq_lseek,
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.release = single_release,
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};
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#endif
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/* --------------------------------------------------------------------------
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AC Adapter Management
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-------------------------------------------------------------------------- */
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static int acpi_ac_get_state(struct acpi_ac *ac)
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{
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acpi_status status = AE_OK;
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if (!ac)
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return -EINVAL;
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status = acpi_evaluate_integer(ac->device->handle, "_PSR", NULL, &ac->state);
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if (ACPI_FAILURE(status)) {
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ACPI_EXCEPTION((AE_INFO, status, "Error reading AC Adapter state"));
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ac->state = ACPI_AC_STATUS_UNKNOWN;
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return -ENODEV;
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}
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return 0;
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}
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/* --------------------------------------------------------------------------
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sysfs I/F
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-------------------------------------------------------------------------- */
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static int get_ac_property(struct power_supply *psy,
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enum power_supply_property psp,
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union power_supply_propval *val)
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{
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struct acpi_ac *ac = to_acpi_ac(psy);
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if (!ac)
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return -ENODEV;
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if (acpi_ac_get_state(ac))
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return -ENODEV;
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switch (psp) {
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case POWER_SUPPLY_PROP_ONLINE:
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val->intval = ac->state;
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break;
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default:
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return -EINVAL;
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}
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return 0;
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}
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static enum power_supply_property ac_props[] = {
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POWER_SUPPLY_PROP_ONLINE,
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};
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#ifdef CONFIG_ACPI_PROCFS_POWER
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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_ac_dir;
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static int acpi_ac_seq_show(struct seq_file *seq, void *offset)
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{
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struct acpi_ac *ac = seq->private;
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if (!ac)
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return 0;
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if (acpi_ac_get_state(ac)) {
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seq_puts(seq, "ERROR: Unable to read AC Adapter state\n");
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return 0;
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}
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seq_puts(seq, "state: ");
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switch (ac->state) {
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case ACPI_AC_STATUS_OFFLINE:
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seq_puts(seq, "off-line\n");
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break;
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case ACPI_AC_STATUS_ONLINE:
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seq_puts(seq, "on-line\n");
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break;
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default:
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seq_puts(seq, "unknown\n");
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break;
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}
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return 0;
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}
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static int acpi_ac_open_fs(struct inode *inode, struct file *file)
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{
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return single_open(file, acpi_ac_seq_show, PDE_DATA(inode));
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}
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static int acpi_ac_add_fs(struct acpi_device *device)
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{
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struct proc_dir_entry *entry = NULL;
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printk(KERN_WARNING PREFIX "Deprecated procfs I/F for AC is loaded,"
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" please retry with CONFIG_ACPI_PROCFS_POWER cleared\n");
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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_ac_dir);
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if (!acpi_device_dir(device))
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return -ENODEV;
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}
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/* 'state' [R] */
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entry = proc_create_data(ACPI_AC_FILE_STATE,
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S_IRUGO, acpi_device_dir(device),
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&acpi_ac_fops, acpi_driver_data(device));
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if (!entry)
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return -ENODEV;
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return 0;
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}
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static int acpi_ac_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_AC_FILE_STATE, acpi_device_dir(device));
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remove_proc_entry(acpi_device_bid(device), acpi_ac_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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#endif
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/* --------------------------------------------------------------------------
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Driver Model
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-------------------------------------------------------------------------- */
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static void acpi_ac_notify(struct acpi_device *device, u32 event)
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{
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struct acpi_ac *ac = acpi_driver_data(device);
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if (!ac)
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return;
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switch (event) {
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default:
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ACPI_DEBUG_PRINT((ACPI_DB_INFO,
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"Unsupported event [0x%x]\n", event));
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case ACPI_AC_NOTIFY_STATUS:
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case ACPI_NOTIFY_BUS_CHECK:
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case ACPI_NOTIFY_DEVICE_CHECK:
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acpi_ac_get_state(ac);
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acpi_bus_generate_proc_event(device, event, (u32) ac->state);
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acpi_bus_generate_netlink_event(device->pnp.device_class,
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dev_name(&device->dev), event,
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(u32) ac->state);
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acpi_notifier_call_chain(device, event, (u32) ac->state);
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kobject_uevent(&ac->charger.dev->kobj, KOBJ_CHANGE);
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}
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return;
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}
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static int acpi_ac_add(struct acpi_device *device)
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{
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int result = 0;
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struct acpi_ac *ac = NULL;
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if (!device)
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return -EINVAL;
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ac = kzalloc(sizeof(struct acpi_ac), GFP_KERNEL);
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if (!ac)
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return -ENOMEM;
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ac->device = device;
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strcpy(acpi_device_name(device), ACPI_AC_DEVICE_NAME);
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strcpy(acpi_device_class(device), ACPI_AC_CLASS);
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device->driver_data = ac;
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result = acpi_ac_get_state(ac);
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if (result)
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goto end;
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#ifdef CONFIG_ACPI_PROCFS_POWER
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result = acpi_ac_add_fs(device);
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#endif
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if (result)
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goto end;
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ac->charger.name = acpi_device_bid(device);
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ac->charger.type = POWER_SUPPLY_TYPE_MAINS;
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ac->charger.properties = ac_props;
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ac->charger.num_properties = ARRAY_SIZE(ac_props);
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ac->charger.get_property = get_ac_property;
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result = power_supply_register(&ac->device->dev, &ac->charger);
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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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ac->state ? "on-line" : "off-line");
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end:
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if (result) {
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#ifdef CONFIG_ACPI_PROCFS_POWER
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acpi_ac_remove_fs(device);
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#endif
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kfree(ac);
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}
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return result;
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}
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#ifdef CONFIG_PM_SLEEP
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static int acpi_ac_resume(struct device *dev)
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{
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struct acpi_ac *ac;
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unsigned old_state;
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if (!dev)
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return -EINVAL;
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ac = acpi_driver_data(to_acpi_device(dev));
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if (!ac)
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return -EINVAL;
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old_state = ac->state;
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if (acpi_ac_get_state(ac))
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return 0;
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if (old_state != ac->state)
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kobject_uevent(&ac->charger.dev->kobj, KOBJ_CHANGE);
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return 0;
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}
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#endif
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static int acpi_ac_remove(struct acpi_device *device)
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{
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struct acpi_ac *ac = NULL;
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if (!device || !acpi_driver_data(device))
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return -EINVAL;
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ac = acpi_driver_data(device);
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if (ac->charger.dev)
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power_supply_unregister(&ac->charger);
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#ifdef CONFIG_ACPI_PROCFS_POWER
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acpi_ac_remove_fs(device);
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#endif
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kfree(ac);
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return 0;
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}
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static int __init acpi_ac_init(void)
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{
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int result;
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if (acpi_disabled)
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return -ENODEV;
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#ifdef CONFIG_ACPI_PROCFS_POWER
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acpi_ac_dir = acpi_lock_ac_dir();
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if (!acpi_ac_dir)
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return -ENODEV;
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#endif
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result = acpi_bus_register_driver(&acpi_ac_driver);
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if (result < 0) {
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#ifdef CONFIG_ACPI_PROCFS_POWER
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acpi_unlock_ac_dir(acpi_ac_dir);
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#endif
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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_ac_exit(void)
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{
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acpi_bus_unregister_driver(&acpi_ac_driver);
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#ifdef CONFIG_ACPI_PROCFS_POWER
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acpi_unlock_ac_dir(acpi_ac_dir);
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#endif
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return;
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}
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module_init(acpi_ac_init);
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module_exit(acpi_ac_exit);
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