mirror of
https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
synced 2024-08-23 17:30:02 +00:00
![Christoph Hellwig](/assets/img/avatar_default.png)
Variants of proc_create{,_data} that directly take a seq_file show callback and drastically reduces the boilerplate code in the callers. All trivial callers converted over. Signed-off-by: Christoph Hellwig <hch@lst.de>
647 lines
18 KiB
C
647 lines
18 KiB
C
/*
|
|
* button.c - ACPI Button Driver
|
|
*
|
|
* 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.
|
|
*
|
|
* ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
|
|
*/
|
|
|
|
#define pr_fmt(fmt) "ACPI: button: " fmt
|
|
|
|
#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 <linux/input.h>
|
|
#include <linux/slab.h>
|
|
#include <linux/acpi.h>
|
|
#include <linux/dmi.h>
|
|
#include <acpi/button.h>
|
|
|
|
#define PREFIX "ACPI: "
|
|
|
|
#define ACPI_BUTTON_CLASS "button"
|
|
#define ACPI_BUTTON_FILE_INFO "info"
|
|
#define ACPI_BUTTON_FILE_STATE "state"
|
|
#define ACPI_BUTTON_TYPE_UNKNOWN 0x00
|
|
#define ACPI_BUTTON_NOTIFY_STATUS 0x80
|
|
|
|
#define ACPI_BUTTON_SUBCLASS_POWER "power"
|
|
#define ACPI_BUTTON_HID_POWER "PNP0C0C"
|
|
#define ACPI_BUTTON_DEVICE_NAME_POWER "Power Button"
|
|
#define ACPI_BUTTON_TYPE_POWER 0x01
|
|
|
|
#define ACPI_BUTTON_SUBCLASS_SLEEP "sleep"
|
|
#define ACPI_BUTTON_HID_SLEEP "PNP0C0E"
|
|
#define ACPI_BUTTON_DEVICE_NAME_SLEEP "Sleep Button"
|
|
#define ACPI_BUTTON_TYPE_SLEEP 0x03
|
|
|
|
#define ACPI_BUTTON_SUBCLASS_LID "lid"
|
|
#define ACPI_BUTTON_HID_LID "PNP0C0D"
|
|
#define ACPI_BUTTON_DEVICE_NAME_LID "Lid Switch"
|
|
#define ACPI_BUTTON_TYPE_LID 0x05
|
|
|
|
#define ACPI_BUTTON_LID_INIT_IGNORE 0x00
|
|
#define ACPI_BUTTON_LID_INIT_OPEN 0x01
|
|
#define ACPI_BUTTON_LID_INIT_METHOD 0x02
|
|
|
|
#define _COMPONENT ACPI_BUTTON_COMPONENT
|
|
ACPI_MODULE_NAME("button");
|
|
|
|
MODULE_AUTHOR("Paul Diefenbaugh");
|
|
MODULE_DESCRIPTION("ACPI Button Driver");
|
|
MODULE_LICENSE("GPL");
|
|
|
|
static const struct acpi_device_id button_device_ids[] = {
|
|
{ACPI_BUTTON_HID_LID, 0},
|
|
{ACPI_BUTTON_HID_SLEEP, 0},
|
|
{ACPI_BUTTON_HID_SLEEPF, 0},
|
|
{ACPI_BUTTON_HID_POWER, 0},
|
|
{ACPI_BUTTON_HID_POWERF, 0},
|
|
{"", 0},
|
|
};
|
|
MODULE_DEVICE_TABLE(acpi, button_device_ids);
|
|
|
|
/*
|
|
* Some devices which don't even have a lid in anyway have a broken _LID
|
|
* method (e.g. pointing to a floating gpio pin) causing spurious LID events.
|
|
*/
|
|
static const struct dmi_system_id lid_blacklst[] = {
|
|
{
|
|
/* GP-electronic T701 */
|
|
.matches = {
|
|
DMI_MATCH(DMI_SYS_VENDOR, "Insyde"),
|
|
DMI_MATCH(DMI_PRODUCT_NAME, "T701"),
|
|
DMI_MATCH(DMI_BIOS_VERSION, "BYT70A.YNCHENG.WIN.007"),
|
|
},
|
|
},
|
|
{}
|
|
};
|
|
|
|
static int acpi_button_add(struct acpi_device *device);
|
|
static int acpi_button_remove(struct acpi_device *device);
|
|
static void acpi_button_notify(struct acpi_device *device, u32 event);
|
|
|
|
#ifdef CONFIG_PM_SLEEP
|
|
static int acpi_button_suspend(struct device *dev);
|
|
static int acpi_button_resume(struct device *dev);
|
|
#else
|
|
#define acpi_button_suspend NULL
|
|
#define acpi_button_resume NULL
|
|
#endif
|
|
static SIMPLE_DEV_PM_OPS(acpi_button_pm, acpi_button_suspend, acpi_button_resume);
|
|
|
|
static struct acpi_driver acpi_button_driver = {
|
|
.name = "button",
|
|
.class = ACPI_BUTTON_CLASS,
|
|
.ids = button_device_ids,
|
|
.ops = {
|
|
.add = acpi_button_add,
|
|
.remove = acpi_button_remove,
|
|
.notify = acpi_button_notify,
|
|
},
|
|
.drv.pm = &acpi_button_pm,
|
|
};
|
|
|
|
struct acpi_button {
|
|
unsigned int type;
|
|
struct input_dev *input;
|
|
char phys[32]; /* for input device */
|
|
unsigned long pushed;
|
|
int last_state;
|
|
ktime_t last_time;
|
|
bool suspended;
|
|
};
|
|
|
|
static BLOCKING_NOTIFIER_HEAD(acpi_lid_notifier);
|
|
static struct acpi_device *lid_device;
|
|
static u8 lid_init_state = ACPI_BUTTON_LID_INIT_METHOD;
|
|
|
|
static unsigned long lid_report_interval __read_mostly = 500;
|
|
module_param(lid_report_interval, ulong, 0644);
|
|
MODULE_PARM_DESC(lid_report_interval, "Interval (ms) between lid key events");
|
|
|
|
/* --------------------------------------------------------------------------
|
|
FS Interface (/proc)
|
|
-------------------------------------------------------------------------- */
|
|
|
|
static struct proc_dir_entry *acpi_button_dir;
|
|
static struct proc_dir_entry *acpi_lid_dir;
|
|
|
|
static int acpi_lid_evaluate_state(struct acpi_device *device)
|
|
{
|
|
unsigned long long lid_state;
|
|
acpi_status status;
|
|
|
|
status = acpi_evaluate_integer(device->handle, "_LID", NULL, &lid_state);
|
|
if (ACPI_FAILURE(status))
|
|
return -ENODEV;
|
|
|
|
return lid_state ? 1 : 0;
|
|
}
|
|
|
|
static int acpi_lid_notify_state(struct acpi_device *device, int state)
|
|
{
|
|
struct acpi_button *button = acpi_driver_data(device);
|
|
int ret;
|
|
ktime_t next_report;
|
|
bool do_update;
|
|
|
|
/*
|
|
* In lid_init_state=ignore mode, if user opens/closes lid
|
|
* frequently with "open" missing, and "last_time" is also updated
|
|
* frequently, "close" cannot be delivered to the userspace.
|
|
* So "last_time" is only updated after a timeout or an actual
|
|
* switch.
|
|
*/
|
|
if (lid_init_state != ACPI_BUTTON_LID_INIT_IGNORE ||
|
|
button->last_state != !!state)
|
|
do_update = true;
|
|
else
|
|
do_update = false;
|
|
|
|
next_report = ktime_add(button->last_time,
|
|
ms_to_ktime(lid_report_interval));
|
|
if (button->last_state == !!state &&
|
|
ktime_after(ktime_get(), next_report)) {
|
|
/* Complain the buggy firmware */
|
|
pr_warn_once("The lid device is not compliant to SW_LID.\n");
|
|
|
|
/*
|
|
* Send the unreliable complement switch event:
|
|
*
|
|
* On most platforms, the lid device is reliable. However
|
|
* there are exceptions:
|
|
* 1. Platforms returning initial lid state as "close" by
|
|
* default after booting/resuming:
|
|
* https://bugzilla.kernel.org/show_bug.cgi?id=89211
|
|
* https://bugzilla.kernel.org/show_bug.cgi?id=106151
|
|
* 2. Platforms never reporting "open" events:
|
|
* https://bugzilla.kernel.org/show_bug.cgi?id=106941
|
|
* On these buggy platforms, the usage model of the ACPI
|
|
* lid device actually is:
|
|
* 1. The initial returning value of _LID may not be
|
|
* reliable.
|
|
* 2. The open event may not be reliable.
|
|
* 3. The close event is reliable.
|
|
*
|
|
* But SW_LID is typed as input switch event, the input
|
|
* layer checks if the event is redundant. Hence if the
|
|
* state is not switched, the userspace cannot see this
|
|
* platform triggered reliable event. By inserting a
|
|
* complement switch event, it then is guaranteed that the
|
|
* platform triggered reliable one can always be seen by
|
|
* the userspace.
|
|
*/
|
|
if (lid_init_state == ACPI_BUTTON_LID_INIT_IGNORE) {
|
|
do_update = true;
|
|
/*
|
|
* Do generate complement switch event for "close"
|
|
* as "close" is reliable and wrong "open" won't
|
|
* trigger unexpected behaviors.
|
|
* Do not generate complement switch event for
|
|
* "open" as "open" is not reliable and wrong
|
|
* "close" will trigger unexpected behaviors.
|
|
*/
|
|
if (!state) {
|
|
input_report_switch(button->input,
|
|
SW_LID, state);
|
|
input_sync(button->input);
|
|
}
|
|
}
|
|
}
|
|
/* Send the platform triggered reliable event */
|
|
if (do_update) {
|
|
acpi_handle_debug(device->handle, "ACPI LID %s\n",
|
|
state ? "open" : "closed");
|
|
input_report_switch(button->input, SW_LID, !state);
|
|
input_sync(button->input);
|
|
button->last_state = !!state;
|
|
button->last_time = ktime_get();
|
|
}
|
|
|
|
if (state)
|
|
acpi_pm_wakeup_event(&device->dev);
|
|
|
|
ret = blocking_notifier_call_chain(&acpi_lid_notifier, state, device);
|
|
if (ret == NOTIFY_DONE)
|
|
ret = blocking_notifier_call_chain(&acpi_lid_notifier, state,
|
|
device);
|
|
if (ret == NOTIFY_DONE || ret == NOTIFY_OK) {
|
|
/*
|
|
* It is also regarded as success if the notifier_chain
|
|
* returns NOTIFY_OK or NOTIFY_DONE.
|
|
*/
|
|
ret = 0;
|
|
}
|
|
return ret;
|
|
}
|
|
|
|
static int acpi_button_state_seq_show(struct seq_file *seq, void *offset)
|
|
{
|
|
struct acpi_device *device = seq->private;
|
|
int state;
|
|
|
|
state = acpi_lid_evaluate_state(device);
|
|
seq_printf(seq, "state: %s\n",
|
|
state < 0 ? "unsupported" : (state ? "open" : "closed"));
|
|
return 0;
|
|
}
|
|
|
|
static int acpi_button_add_fs(struct acpi_device *device)
|
|
{
|
|
struct acpi_button *button = acpi_driver_data(device);
|
|
struct proc_dir_entry *entry = NULL;
|
|
int ret = 0;
|
|
|
|
/* procfs I/F for ACPI lid device only */
|
|
if (button->type != ACPI_BUTTON_TYPE_LID)
|
|
return 0;
|
|
|
|
if (acpi_button_dir || acpi_lid_dir) {
|
|
printk(KERN_ERR PREFIX "More than one Lid device found!\n");
|
|
return -EEXIST;
|
|
}
|
|
|
|
/* create /proc/acpi/button */
|
|
acpi_button_dir = proc_mkdir(ACPI_BUTTON_CLASS, acpi_root_dir);
|
|
if (!acpi_button_dir)
|
|
return -ENODEV;
|
|
|
|
/* create /proc/acpi/button/lid */
|
|
acpi_lid_dir = proc_mkdir(ACPI_BUTTON_SUBCLASS_LID, acpi_button_dir);
|
|
if (!acpi_lid_dir) {
|
|
ret = -ENODEV;
|
|
goto remove_button_dir;
|
|
}
|
|
|
|
/* create /proc/acpi/button/lid/LID/ */
|
|
acpi_device_dir(device) = proc_mkdir(acpi_device_bid(device), acpi_lid_dir);
|
|
if (!acpi_device_dir(device)) {
|
|
ret = -ENODEV;
|
|
goto remove_lid_dir;
|
|
}
|
|
|
|
/* create /proc/acpi/button/lid/LID/state */
|
|
entry = proc_create_single_data(ACPI_BUTTON_FILE_STATE, S_IRUGO,
|
|
acpi_device_dir(device), acpi_button_state_seq_show,
|
|
device);
|
|
if (!entry) {
|
|
ret = -ENODEV;
|
|
goto remove_dev_dir;
|
|
}
|
|
|
|
done:
|
|
return ret;
|
|
|
|
remove_dev_dir:
|
|
remove_proc_entry(acpi_device_bid(device),
|
|
acpi_lid_dir);
|
|
acpi_device_dir(device) = NULL;
|
|
remove_lid_dir:
|
|
remove_proc_entry(ACPI_BUTTON_SUBCLASS_LID, acpi_button_dir);
|
|
acpi_lid_dir = NULL;
|
|
remove_button_dir:
|
|
remove_proc_entry(ACPI_BUTTON_CLASS, acpi_root_dir);
|
|
acpi_button_dir = NULL;
|
|
goto done;
|
|
}
|
|
|
|
static int acpi_button_remove_fs(struct acpi_device *device)
|
|
{
|
|
struct acpi_button *button = acpi_driver_data(device);
|
|
|
|
if (button->type != ACPI_BUTTON_TYPE_LID)
|
|
return 0;
|
|
|
|
remove_proc_entry(ACPI_BUTTON_FILE_STATE,
|
|
acpi_device_dir(device));
|
|
remove_proc_entry(acpi_device_bid(device),
|
|
acpi_lid_dir);
|
|
acpi_device_dir(device) = NULL;
|
|
remove_proc_entry(ACPI_BUTTON_SUBCLASS_LID, acpi_button_dir);
|
|
acpi_lid_dir = NULL;
|
|
remove_proc_entry(ACPI_BUTTON_CLASS, acpi_root_dir);
|
|
acpi_button_dir = NULL;
|
|
|
|
return 0;
|
|
}
|
|
|
|
/* --------------------------------------------------------------------------
|
|
Driver Interface
|
|
-------------------------------------------------------------------------- */
|
|
int acpi_lid_notifier_register(struct notifier_block *nb)
|
|
{
|
|
return blocking_notifier_chain_register(&acpi_lid_notifier, nb);
|
|
}
|
|
EXPORT_SYMBOL(acpi_lid_notifier_register);
|
|
|
|
int acpi_lid_notifier_unregister(struct notifier_block *nb)
|
|
{
|
|
return blocking_notifier_chain_unregister(&acpi_lid_notifier, nb);
|
|
}
|
|
EXPORT_SYMBOL(acpi_lid_notifier_unregister);
|
|
|
|
int acpi_lid_open(void)
|
|
{
|
|
if (!lid_device)
|
|
return -ENODEV;
|
|
|
|
return acpi_lid_evaluate_state(lid_device);
|
|
}
|
|
EXPORT_SYMBOL(acpi_lid_open);
|
|
|
|
static int acpi_lid_update_state(struct acpi_device *device)
|
|
{
|
|
int state;
|
|
|
|
state = acpi_lid_evaluate_state(device);
|
|
if (state < 0)
|
|
return state;
|
|
|
|
return acpi_lid_notify_state(device, state);
|
|
}
|
|
|
|
static void acpi_lid_initialize_state(struct acpi_device *device)
|
|
{
|
|
switch (lid_init_state) {
|
|
case ACPI_BUTTON_LID_INIT_OPEN:
|
|
(void)acpi_lid_notify_state(device, 1);
|
|
break;
|
|
case ACPI_BUTTON_LID_INIT_METHOD:
|
|
(void)acpi_lid_update_state(device);
|
|
break;
|
|
case ACPI_BUTTON_LID_INIT_IGNORE:
|
|
default:
|
|
break;
|
|
}
|
|
}
|
|
|
|
static void acpi_button_notify(struct acpi_device *device, u32 event)
|
|
{
|
|
struct acpi_button *button = acpi_driver_data(device);
|
|
struct input_dev *input;
|
|
int users;
|
|
|
|
switch (event) {
|
|
case ACPI_FIXED_HARDWARE_EVENT:
|
|
event = ACPI_BUTTON_NOTIFY_STATUS;
|
|
/* fall through */
|
|
case ACPI_BUTTON_NOTIFY_STATUS:
|
|
input = button->input;
|
|
if (button->type == ACPI_BUTTON_TYPE_LID) {
|
|
mutex_lock(&button->input->mutex);
|
|
users = button->input->users;
|
|
mutex_unlock(&button->input->mutex);
|
|
if (users)
|
|
acpi_lid_update_state(device);
|
|
} else {
|
|
int keycode;
|
|
|
|
acpi_pm_wakeup_event(&device->dev);
|
|
if (button->suspended)
|
|
break;
|
|
|
|
keycode = test_bit(KEY_SLEEP, input->keybit) ?
|
|
KEY_SLEEP : KEY_POWER;
|
|
input_report_key(input, keycode, 1);
|
|
input_sync(input);
|
|
input_report_key(input, keycode, 0);
|
|
input_sync(input);
|
|
|
|
acpi_bus_generate_netlink_event(
|
|
device->pnp.device_class,
|
|
dev_name(&device->dev),
|
|
event, ++button->pushed);
|
|
}
|
|
break;
|
|
default:
|
|
ACPI_DEBUG_PRINT((ACPI_DB_INFO,
|
|
"Unsupported event [0x%x]\n", event));
|
|
break;
|
|
}
|
|
}
|
|
|
|
#ifdef CONFIG_PM_SLEEP
|
|
static int acpi_button_suspend(struct device *dev)
|
|
{
|
|
struct acpi_device *device = to_acpi_device(dev);
|
|
struct acpi_button *button = acpi_driver_data(device);
|
|
|
|
button->suspended = true;
|
|
return 0;
|
|
}
|
|
|
|
static int acpi_button_resume(struct device *dev)
|
|
{
|
|
struct acpi_device *device = to_acpi_device(dev);
|
|
struct acpi_button *button = acpi_driver_data(device);
|
|
|
|
button->suspended = false;
|
|
if (button->type == ACPI_BUTTON_TYPE_LID && button->input->users)
|
|
acpi_lid_initialize_state(device);
|
|
return 0;
|
|
}
|
|
#endif
|
|
|
|
static int acpi_lid_input_open(struct input_dev *input)
|
|
{
|
|
struct acpi_device *device = input_get_drvdata(input);
|
|
struct acpi_button *button = acpi_driver_data(device);
|
|
|
|
button->last_state = !!acpi_lid_evaluate_state(device);
|
|
button->last_time = ktime_get();
|
|
acpi_lid_initialize_state(device);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int acpi_button_add(struct acpi_device *device)
|
|
{
|
|
struct acpi_button *button;
|
|
struct input_dev *input;
|
|
const char *hid = acpi_device_hid(device);
|
|
char *name, *class;
|
|
int error;
|
|
|
|
if (!strcmp(hid, ACPI_BUTTON_HID_LID) && dmi_check_system(lid_blacklst))
|
|
return -ENODEV;
|
|
|
|
button = kzalloc(sizeof(struct acpi_button), GFP_KERNEL);
|
|
if (!button)
|
|
return -ENOMEM;
|
|
|
|
device->driver_data = button;
|
|
|
|
button->input = input = input_allocate_device();
|
|
if (!input) {
|
|
error = -ENOMEM;
|
|
goto err_free_button;
|
|
}
|
|
|
|
name = acpi_device_name(device);
|
|
class = acpi_device_class(device);
|
|
|
|
if (!strcmp(hid, ACPI_BUTTON_HID_POWER) ||
|
|
!strcmp(hid, ACPI_BUTTON_HID_POWERF)) {
|
|
button->type = ACPI_BUTTON_TYPE_POWER;
|
|
strcpy(name, ACPI_BUTTON_DEVICE_NAME_POWER);
|
|
sprintf(class, "%s/%s",
|
|
ACPI_BUTTON_CLASS, ACPI_BUTTON_SUBCLASS_POWER);
|
|
} else if (!strcmp(hid, ACPI_BUTTON_HID_SLEEP) ||
|
|
!strcmp(hid, ACPI_BUTTON_HID_SLEEPF)) {
|
|
button->type = ACPI_BUTTON_TYPE_SLEEP;
|
|
strcpy(name, ACPI_BUTTON_DEVICE_NAME_SLEEP);
|
|
sprintf(class, "%s/%s",
|
|
ACPI_BUTTON_CLASS, ACPI_BUTTON_SUBCLASS_SLEEP);
|
|
} else if (!strcmp(hid, ACPI_BUTTON_HID_LID)) {
|
|
button->type = ACPI_BUTTON_TYPE_LID;
|
|
strcpy(name, ACPI_BUTTON_DEVICE_NAME_LID);
|
|
sprintf(class, "%s/%s",
|
|
ACPI_BUTTON_CLASS, ACPI_BUTTON_SUBCLASS_LID);
|
|
input->open = acpi_lid_input_open;
|
|
} else {
|
|
printk(KERN_ERR PREFIX "Unsupported hid [%s]\n", hid);
|
|
error = -ENODEV;
|
|
goto err_free_input;
|
|
}
|
|
|
|
error = acpi_button_add_fs(device);
|
|
if (error)
|
|
goto err_free_input;
|
|
|
|
snprintf(button->phys, sizeof(button->phys), "%s/button/input0", hid);
|
|
|
|
input->name = name;
|
|
input->phys = button->phys;
|
|
input->id.bustype = BUS_HOST;
|
|
input->id.product = button->type;
|
|
input->dev.parent = &device->dev;
|
|
|
|
switch (button->type) {
|
|
case ACPI_BUTTON_TYPE_POWER:
|
|
input_set_capability(input, EV_KEY, KEY_POWER);
|
|
break;
|
|
|
|
case ACPI_BUTTON_TYPE_SLEEP:
|
|
input_set_capability(input, EV_KEY, KEY_SLEEP);
|
|
break;
|
|
|
|
case ACPI_BUTTON_TYPE_LID:
|
|
input_set_capability(input, EV_SW, SW_LID);
|
|
break;
|
|
}
|
|
|
|
input_set_drvdata(input, device);
|
|
error = input_register_device(input);
|
|
if (error)
|
|
goto err_remove_fs;
|
|
if (button->type == ACPI_BUTTON_TYPE_LID) {
|
|
/*
|
|
* This assumes there's only one lid device, or if there are
|
|
* more we only care about the last one...
|
|
*/
|
|
lid_device = device;
|
|
}
|
|
|
|
device_init_wakeup(&device->dev, true);
|
|
printk(KERN_INFO PREFIX "%s [%s]\n", name, acpi_device_bid(device));
|
|
return 0;
|
|
|
|
err_remove_fs:
|
|
acpi_button_remove_fs(device);
|
|
err_free_input:
|
|
input_free_device(input);
|
|
err_free_button:
|
|
kfree(button);
|
|
return error;
|
|
}
|
|
|
|
static int acpi_button_remove(struct acpi_device *device)
|
|
{
|
|
struct acpi_button *button = acpi_driver_data(device);
|
|
|
|
acpi_button_remove_fs(device);
|
|
input_unregister_device(button->input);
|
|
kfree(button);
|
|
return 0;
|
|
}
|
|
|
|
static int param_set_lid_init_state(const char *val,
|
|
const struct kernel_param *kp)
|
|
{
|
|
int result = 0;
|
|
|
|
if (!strncmp(val, "open", sizeof("open") - 1)) {
|
|
lid_init_state = ACPI_BUTTON_LID_INIT_OPEN;
|
|
pr_info("Notify initial lid state as open\n");
|
|
} else if (!strncmp(val, "method", sizeof("method") - 1)) {
|
|
lid_init_state = ACPI_BUTTON_LID_INIT_METHOD;
|
|
pr_info("Notify initial lid state with _LID return value\n");
|
|
} else if (!strncmp(val, "ignore", sizeof("ignore") - 1)) {
|
|
lid_init_state = ACPI_BUTTON_LID_INIT_IGNORE;
|
|
pr_info("Do not notify initial lid state\n");
|
|
} else
|
|
result = -EINVAL;
|
|
return result;
|
|
}
|
|
|
|
static int param_get_lid_init_state(char *buffer,
|
|
const struct kernel_param *kp)
|
|
{
|
|
switch (lid_init_state) {
|
|
case ACPI_BUTTON_LID_INIT_OPEN:
|
|
return sprintf(buffer, "open");
|
|
case ACPI_BUTTON_LID_INIT_METHOD:
|
|
return sprintf(buffer, "method");
|
|
case ACPI_BUTTON_LID_INIT_IGNORE:
|
|
return sprintf(buffer, "ignore");
|
|
default:
|
|
return sprintf(buffer, "invalid");
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
module_param_call(lid_init_state,
|
|
param_set_lid_init_state, param_get_lid_init_state,
|
|
NULL, 0644);
|
|
MODULE_PARM_DESC(lid_init_state, "Behavior for reporting LID initial state");
|
|
|
|
static int acpi_button_register_driver(struct acpi_driver *driver)
|
|
{
|
|
/*
|
|
* Modules such as nouveau.ko and i915.ko have a link time dependency
|
|
* on acpi_lid_open(), and would therefore not be loadable on ACPI
|
|
* capable kernels booted in non-ACPI mode if the return value of
|
|
* acpi_bus_register_driver() is returned from here with ACPI disabled
|
|
* when this driver is built as a module.
|
|
*/
|
|
if (acpi_disabled)
|
|
return 0;
|
|
|
|
return acpi_bus_register_driver(driver);
|
|
}
|
|
|
|
static void acpi_button_unregister_driver(struct acpi_driver *driver)
|
|
{
|
|
if (!acpi_disabled)
|
|
acpi_bus_unregister_driver(driver);
|
|
}
|
|
|
|
module_driver(acpi_button_driver, acpi_button_register_driver,
|
|
acpi_button_unregister_driver);
|