![Rafael J. Wysocki](/assets/img/avatar_default.png)
There are ACPI devices (buttons and the laptop lid) that can wake up the system from sleep states and have no "physical" companion devices. The ACPI subsystem uses two flags, wakeup.state.enabled and wakeup.flags.always_enabled, for handling those devices, but they are not accessible through the standard device wakeup infrastructure. User space can only control them via the /proc/acpi/wakeup interface that is not really convenient (e.g. the way in which devices are enabled to wake up the system is not portable between different systems, because it requires one to know the devices' "names" used in the system's ACPI tables). To address this problem, use standard device wakeup flags instead of the special ACPI flags for handling those devices. In particular, use device_set_wakeup_capable() to mark the ACPI wakeup devices during initialization and use device_set_wakeup_enable() to allow or disallow them to wake up the system from sleep states. Rework the /proc/acpi/wakeup interface to take these changes into account. Signed-off-by: Rafael J. Wysocki <rjw@sisk.pl> Signed-off-by: Len Brown <len.brown@intel.com>
493 lines
13 KiB
C
493 lines
13 KiB
C
/*
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* button.c - ACPI Button Driver
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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 <linux/input.h>
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#include <linux/slab.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_BUTTON_CLASS "button"
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#define ACPI_BUTTON_FILE_INFO "info"
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#define ACPI_BUTTON_FILE_STATE "state"
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#define ACPI_BUTTON_TYPE_UNKNOWN 0x00
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#define ACPI_BUTTON_NOTIFY_STATUS 0x80
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#define ACPI_BUTTON_SUBCLASS_POWER "power"
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#define ACPI_BUTTON_HID_POWER "PNP0C0C"
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#define ACPI_BUTTON_DEVICE_NAME_POWER "Power Button"
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#define ACPI_BUTTON_TYPE_POWER 0x01
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#define ACPI_BUTTON_SUBCLASS_SLEEP "sleep"
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#define ACPI_BUTTON_HID_SLEEP "PNP0C0E"
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#define ACPI_BUTTON_DEVICE_NAME_SLEEP "Sleep Button"
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#define ACPI_BUTTON_TYPE_SLEEP 0x03
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#define ACPI_BUTTON_SUBCLASS_LID "lid"
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#define ACPI_BUTTON_HID_LID "PNP0C0D"
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#define ACPI_BUTTON_DEVICE_NAME_LID "Lid Switch"
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#define ACPI_BUTTON_TYPE_LID 0x05
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#define _COMPONENT ACPI_BUTTON_COMPONENT
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ACPI_MODULE_NAME("button");
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MODULE_AUTHOR("Paul Diefenbaugh");
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MODULE_DESCRIPTION("ACPI Button Driver");
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MODULE_LICENSE("GPL");
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static const struct acpi_device_id button_device_ids[] = {
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{ACPI_BUTTON_HID_LID, 0},
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{ACPI_BUTTON_HID_SLEEP, 0},
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{ACPI_BUTTON_HID_SLEEPF, 0},
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{ACPI_BUTTON_HID_POWER, 0},
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{ACPI_BUTTON_HID_POWERF, 0},
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{"", 0},
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};
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MODULE_DEVICE_TABLE(acpi, button_device_ids);
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static int acpi_button_add(struct acpi_device *device);
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static int acpi_button_remove(struct acpi_device *device, int type);
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static int acpi_button_resume(struct acpi_device *device);
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static void acpi_button_notify(struct acpi_device *device, u32 event);
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static int acpi_button_info_open_fs(struct inode *inode, struct file *file);
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static int acpi_button_state_open_fs(struct inode *inode, struct file *file);
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static struct acpi_driver acpi_button_driver = {
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.name = "button",
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.class = ACPI_BUTTON_CLASS,
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.ids = button_device_ids,
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.ops = {
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.add = acpi_button_add,
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.resume = acpi_button_resume,
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.remove = acpi_button_remove,
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.notify = acpi_button_notify,
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},
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};
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struct acpi_button {
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unsigned int type;
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struct input_dev *input;
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char phys[32]; /* for input device */
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unsigned long pushed;
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};
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static const struct file_operations acpi_button_info_fops = {
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.owner = THIS_MODULE,
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.open = acpi_button_info_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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static const struct file_operations acpi_button_state_fops = {
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.owner = THIS_MODULE,
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.open = acpi_button_state_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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static BLOCKING_NOTIFIER_HEAD(acpi_lid_notifier);
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static struct acpi_device *lid_device;
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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_button_dir;
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static int acpi_button_info_seq_show(struct seq_file *seq, void *offset)
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{
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struct acpi_device *device = seq->private;
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seq_printf(seq, "type: %s\n",
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acpi_device_name(device));
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return 0;
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}
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static int acpi_button_info_open_fs(struct inode *inode, struct file *file)
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{
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return single_open(file, acpi_button_info_seq_show, PDE(inode)->data);
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}
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static int acpi_button_state_seq_show(struct seq_file *seq, void *offset)
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{
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struct acpi_device *device = seq->private;
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acpi_status status;
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unsigned long long state;
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status = acpi_evaluate_integer(device->handle, "_LID", NULL, &state);
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seq_printf(seq, "state: %s\n",
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ACPI_FAILURE(status) ? "unsupported" :
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(state ? "open" : "closed"));
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return 0;
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}
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static int acpi_button_state_open_fs(struct inode *inode, struct file *file)
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{
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return single_open(file, acpi_button_state_seq_show, PDE(inode)->data);
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}
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static struct proc_dir_entry *acpi_power_dir;
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static struct proc_dir_entry *acpi_sleep_dir;
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static struct proc_dir_entry *acpi_lid_dir;
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static int acpi_button_add_fs(struct acpi_device *device)
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{
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struct acpi_button *button = acpi_driver_data(device);
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struct proc_dir_entry *entry = NULL;
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switch (button->type) {
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case ACPI_BUTTON_TYPE_POWER:
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if (!acpi_power_dir)
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acpi_power_dir = proc_mkdir(ACPI_BUTTON_SUBCLASS_POWER,
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acpi_button_dir);
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entry = acpi_power_dir;
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break;
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case ACPI_BUTTON_TYPE_SLEEP:
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if (!acpi_sleep_dir)
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acpi_sleep_dir = proc_mkdir(ACPI_BUTTON_SUBCLASS_SLEEP,
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acpi_button_dir);
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entry = acpi_sleep_dir;
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break;
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case ACPI_BUTTON_TYPE_LID:
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if (!acpi_lid_dir)
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acpi_lid_dir = proc_mkdir(ACPI_BUTTON_SUBCLASS_LID,
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acpi_button_dir);
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entry = acpi_lid_dir;
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break;
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}
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if (!entry)
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return -ENODEV;
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acpi_device_dir(device) = proc_mkdir(acpi_device_bid(device), entry);
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if (!acpi_device_dir(device))
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return -ENODEV;
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/* 'info' [R] */
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entry = proc_create_data(ACPI_BUTTON_FILE_INFO,
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S_IRUGO, acpi_device_dir(device),
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&acpi_button_info_fops, device);
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if (!entry)
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return -ENODEV;
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/* show lid state [R] */
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if (button->type == ACPI_BUTTON_TYPE_LID) {
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entry = proc_create_data(ACPI_BUTTON_FILE_STATE,
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S_IRUGO, acpi_device_dir(device),
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&acpi_button_state_fops, device);
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if (!entry)
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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 int acpi_button_remove_fs(struct acpi_device *device)
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{
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struct acpi_button *button = acpi_driver_data(device);
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if (acpi_device_dir(device)) {
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if (button->type == ACPI_BUTTON_TYPE_LID)
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remove_proc_entry(ACPI_BUTTON_FILE_STATE,
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acpi_device_dir(device));
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remove_proc_entry(ACPI_BUTTON_FILE_INFO,
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acpi_device_dir(device));
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remove_proc_entry(acpi_device_bid(device),
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acpi_device_dir(device)->parent);
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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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int acpi_lid_notifier_register(struct notifier_block *nb)
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{
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return blocking_notifier_chain_register(&acpi_lid_notifier, nb);
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}
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EXPORT_SYMBOL(acpi_lid_notifier_register);
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int acpi_lid_notifier_unregister(struct notifier_block *nb)
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{
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return blocking_notifier_chain_unregister(&acpi_lid_notifier, nb);
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}
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EXPORT_SYMBOL(acpi_lid_notifier_unregister);
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int acpi_lid_open(void)
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{
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acpi_status status;
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unsigned long long state;
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if (!lid_device)
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return -ENODEV;
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status = acpi_evaluate_integer(lid_device->handle, "_LID", NULL,
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&state);
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if (ACPI_FAILURE(status))
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return -ENODEV;
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return !!state;
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}
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EXPORT_SYMBOL(acpi_lid_open);
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static int acpi_lid_send_state(struct acpi_device *device)
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{
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struct acpi_button *button = acpi_driver_data(device);
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unsigned long long state;
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acpi_status status;
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int ret;
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status = acpi_evaluate_integer(device->handle, "_LID", NULL, &state);
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if (ACPI_FAILURE(status))
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return -ENODEV;
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/* input layer checks if event is redundant */
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input_report_switch(button->input, SW_LID, !state);
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input_sync(button->input);
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ret = blocking_notifier_call_chain(&acpi_lid_notifier, state, device);
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if (ret == NOTIFY_DONE)
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ret = blocking_notifier_call_chain(&acpi_lid_notifier, state,
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device);
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if (ret == NOTIFY_DONE || ret == NOTIFY_OK) {
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/*
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* It is also regarded as success if the notifier_chain
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* returns NOTIFY_OK or NOTIFY_DONE.
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*/
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ret = 0;
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}
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return ret;
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}
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static void acpi_button_notify(struct acpi_device *device, u32 event)
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{
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struct acpi_button *button = acpi_driver_data(device);
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struct input_dev *input;
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switch (event) {
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case ACPI_FIXED_HARDWARE_EVENT:
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event = ACPI_BUTTON_NOTIFY_STATUS;
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/* fall through */
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case ACPI_BUTTON_NOTIFY_STATUS:
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input = button->input;
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if (button->type == ACPI_BUTTON_TYPE_LID) {
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acpi_lid_send_state(device);
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} else {
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int keycode = test_bit(KEY_SLEEP, input->keybit) ?
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KEY_SLEEP : KEY_POWER;
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input_report_key(input, keycode, 1);
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input_sync(input);
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input_report_key(input, keycode, 0);
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input_sync(input);
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}
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acpi_bus_generate_proc_event(device, event, ++button->pushed);
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break;
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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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break;
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}
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}
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static int acpi_button_resume(struct acpi_device *device)
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{
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struct acpi_button *button = acpi_driver_data(device);
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if (button->type == ACPI_BUTTON_TYPE_LID)
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return acpi_lid_send_state(device);
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return 0;
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}
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static int acpi_button_add(struct acpi_device *device)
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{
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struct acpi_button *button;
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struct input_dev *input;
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const char *hid = acpi_device_hid(device);
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char *name, *class;
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int error;
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button = kzalloc(sizeof(struct acpi_button), GFP_KERNEL);
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if (!button)
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return -ENOMEM;
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device->driver_data = button;
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button->input = input = input_allocate_device();
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if (!input) {
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error = -ENOMEM;
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goto err_free_button;
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}
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name = acpi_device_name(device);
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class = acpi_device_class(device);
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if (!strcmp(hid, ACPI_BUTTON_HID_POWER) ||
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!strcmp(hid, ACPI_BUTTON_HID_POWERF)) {
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button->type = ACPI_BUTTON_TYPE_POWER;
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strcpy(name, ACPI_BUTTON_DEVICE_NAME_POWER);
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sprintf(class, "%s/%s",
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ACPI_BUTTON_CLASS, ACPI_BUTTON_SUBCLASS_POWER);
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} else if (!strcmp(hid, ACPI_BUTTON_HID_SLEEP) ||
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!strcmp(hid, ACPI_BUTTON_HID_SLEEPF)) {
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button->type = ACPI_BUTTON_TYPE_SLEEP;
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strcpy(name, ACPI_BUTTON_DEVICE_NAME_SLEEP);
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sprintf(class, "%s/%s",
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ACPI_BUTTON_CLASS, ACPI_BUTTON_SUBCLASS_SLEEP);
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} else if (!strcmp(hid, ACPI_BUTTON_HID_LID)) {
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button->type = ACPI_BUTTON_TYPE_LID;
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strcpy(name, ACPI_BUTTON_DEVICE_NAME_LID);
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sprintf(class, "%s/%s",
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ACPI_BUTTON_CLASS, ACPI_BUTTON_SUBCLASS_LID);
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} else {
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printk(KERN_ERR PREFIX "Unsupported hid [%s]\n", hid);
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error = -ENODEV;
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goto err_free_input;
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}
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error = acpi_button_add_fs(device);
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if (error)
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goto err_free_input;
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snprintf(button->phys, sizeof(button->phys), "%s/button/input0", hid);
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input->name = name;
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input->phys = button->phys;
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input->id.bustype = BUS_HOST;
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input->id.product = button->type;
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input->dev.parent = &device->dev;
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switch (button->type) {
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case ACPI_BUTTON_TYPE_POWER:
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input->evbit[0] = BIT_MASK(EV_KEY);
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set_bit(KEY_POWER, input->keybit);
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break;
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case ACPI_BUTTON_TYPE_SLEEP:
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input->evbit[0] = BIT_MASK(EV_KEY);
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set_bit(KEY_SLEEP, input->keybit);
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break;
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case ACPI_BUTTON_TYPE_LID:
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input->evbit[0] = BIT_MASK(EV_SW);
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set_bit(SW_LID, input->swbit);
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break;
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}
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error = input_register_device(input);
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if (error)
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goto err_remove_fs;
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if (button->type == ACPI_BUTTON_TYPE_LID) {
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acpi_lid_send_state(device);
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/*
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* This assumes there's only one lid device, or if there are
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* more we only care about the last one...
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*/
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lid_device = device;
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}
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if (device->wakeup.flags.valid) {
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/* Button's GPE is run-wake GPE */
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acpi_enable_gpe(device->wakeup.gpe_device,
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device->wakeup.gpe_number);
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device->wakeup.run_wake_count++;
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device_set_wakeup_enable(&device->dev, true);
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}
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printk(KERN_INFO PREFIX "%s [%s]\n", name, acpi_device_bid(device));
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return 0;
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err_remove_fs:
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acpi_button_remove_fs(device);
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err_free_input:
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input_free_device(input);
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err_free_button:
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kfree(button);
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return error;
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}
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static int acpi_button_remove(struct acpi_device *device, int type)
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{
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struct acpi_button *button = acpi_driver_data(device);
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if (device->wakeup.flags.valid) {
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acpi_disable_gpe(device->wakeup.gpe_device,
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device->wakeup.gpe_number);
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device->wakeup.run_wake_count--;
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device_set_wakeup_enable(&device->dev, false);
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}
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acpi_button_remove_fs(device);
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input_unregister_device(button->input);
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kfree(button);
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return 0;
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}
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static int __init acpi_button_init(void)
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{
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int result;
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acpi_button_dir = proc_mkdir(ACPI_BUTTON_CLASS, acpi_root_dir);
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if (!acpi_button_dir)
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return -ENODEV;
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result = acpi_bus_register_driver(&acpi_button_driver);
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if (result < 0) {
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remove_proc_entry(ACPI_BUTTON_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_button_exit(void)
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{
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acpi_bus_unregister_driver(&acpi_button_driver);
|
|
|
|
if (acpi_power_dir)
|
|
remove_proc_entry(ACPI_BUTTON_SUBCLASS_POWER, acpi_button_dir);
|
|
if (acpi_sleep_dir)
|
|
remove_proc_entry(ACPI_BUTTON_SUBCLASS_SLEEP, acpi_button_dir);
|
|
if (acpi_lid_dir)
|
|
remove_proc_entry(ACPI_BUTTON_SUBCLASS_LID, acpi_button_dir);
|
|
remove_proc_entry(ACPI_BUTTON_CLASS, acpi_root_dir);
|
|
}
|
|
|
|
module_init(acpi_button_init);
|
|
module_exit(acpi_button_exit);
|