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ecb10b694b
The mode is buggy, and lid_init__state=open is more useful than this mode, so this patch makes it deprecated. Signed-off-by: Lv Zheng <lv.zheng@intel.com> Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
589 lines
16 KiB
C
589 lines
16 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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* ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
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*/
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#define pr_fmt(fmt) "ACPI : button: " fmt
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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 <linux/acpi.h>
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#include <acpi/button.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 ACPI_BUTTON_LID_INIT_IGNORE 0x00
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#define ACPI_BUTTON_LID_INIT_OPEN 0x01
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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);
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static void acpi_button_notify(struct acpi_device *device, u32 event);
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#ifdef CONFIG_PM_SLEEP
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static int acpi_button_suspend(struct device *dev);
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static int acpi_button_resume(struct device *dev);
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#else
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#define acpi_button_suspend NULL
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#define acpi_button_resume NULL
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#endif
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static SIMPLE_DEV_PM_OPS(acpi_button_pm, acpi_button_suspend, acpi_button_resume);
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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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.remove = acpi_button_remove,
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.notify = acpi_button_notify,
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},
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.drv.pm = &acpi_button_pm,
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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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int last_state;
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ktime_t last_time;
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bool suspended;
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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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static u8 lid_init_state = ACPI_BUTTON_LID_INIT_OPEN;
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static unsigned long lid_report_interval __read_mostly = 500;
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module_param(lid_report_interval, ulong, 0644);
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MODULE_PARM_DESC(lid_report_interval, "Interval (ms) between lid key events");
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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 struct proc_dir_entry *acpi_lid_dir;
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static int acpi_lid_evaluate_state(struct acpi_device *device)
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{
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unsigned long long lid_state;
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acpi_status status;
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status = acpi_evaluate_integer(device->handle, "_LID", NULL, &lid_state);
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if (ACPI_FAILURE(status))
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return -ENODEV;
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return lid_state ? 1 : 0;
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}
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static int acpi_lid_notify_state(struct acpi_device *device, int state)
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{
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struct acpi_button *button = acpi_driver_data(device);
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int ret;
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ktime_t next_report;
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bool do_update;
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/*
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* In lid_init_state=ignore mode, if user opens/closes lid
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* frequently with "open" missing, and "last_time" is also updated
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* frequently, "close" cannot be delivered to the userspace.
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* So "last_time" is only updated after a timeout or an actual
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* switch.
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*/
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if (lid_init_state != ACPI_BUTTON_LID_INIT_IGNORE ||
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button->last_state != !!state)
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do_update = true;
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else
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do_update = false;
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next_report = ktime_add(button->last_time,
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ms_to_ktime(lid_report_interval));
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if (button->last_state == !!state &&
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ktime_after(ktime_get(), next_report)) {
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/* Complain the buggy firmware */
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pr_warn_once("The lid device is not compliant to SW_LID.\n");
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/*
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* Send the unreliable complement switch event:
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*
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* On most platforms, the lid device is reliable. However
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* there are exceptions:
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* 1. Platforms returning initial lid state as "close" by
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* default after booting/resuming:
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* https://bugzilla.kernel.org/show_bug.cgi?id=89211
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* https://bugzilla.kernel.org/show_bug.cgi?id=106151
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* 2. Platforms never reporting "open" events:
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* https://bugzilla.kernel.org/show_bug.cgi?id=106941
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* On these buggy platforms, the usage model of the ACPI
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* lid device actually is:
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* 1. The initial returning value of _LID may not be
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* reliable.
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* 2. The open event may not be reliable.
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* 3. The close event is reliable.
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*
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* But SW_LID is typed as input switch event, the input
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* layer checks if the event is redundant. Hence if the
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* state is not switched, the userspace cannot see this
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* platform triggered reliable event. By inserting a
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* complement switch event, it then is guaranteed that the
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* platform triggered reliable one can always be seen by
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* the userspace.
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*/
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if (lid_init_state == ACPI_BUTTON_LID_INIT_IGNORE) {
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do_update = true;
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/*
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* Do generate complement switch event for "close"
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* as "close" is reliable and wrong "open" won't
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* trigger unexpected behaviors.
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* Do not generate complement switch event for
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* "open" as "open" is not reliable and wrong
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* "close" will trigger unexpected behaviors.
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*/
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if (!state) {
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input_report_switch(button->input,
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SW_LID, state);
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input_sync(button->input);
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}
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}
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}
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/* Send the platform triggered reliable event */
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if (do_update) {
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input_report_switch(button->input, SW_LID, !state);
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input_sync(button->input);
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button->last_state = !!state;
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button->last_time = ktime_get();
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}
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if (state)
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pm_wakeup_event(&device->dev, 0);
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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 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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int state;
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state = acpi_lid_evaluate_state(device);
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seq_printf(seq, "state: %s\n",
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state < 0 ? "unsupported" : (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_DATA(inode));
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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 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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int ret = 0;
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/* procfs I/F for ACPI lid device only */
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if (button->type != ACPI_BUTTON_TYPE_LID)
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return 0;
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if (acpi_button_dir || acpi_lid_dir) {
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printk(KERN_ERR PREFIX "More than one Lid device found!\n");
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return -EEXIST;
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}
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/* create /proc/acpi/button */
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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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/* create /proc/acpi/button/lid */
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acpi_lid_dir = proc_mkdir(ACPI_BUTTON_SUBCLASS_LID, acpi_button_dir);
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if (!acpi_lid_dir) {
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ret = -ENODEV;
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goto remove_button_dir;
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}
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/* create /proc/acpi/button/lid/LID/ */
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acpi_device_dir(device) = proc_mkdir(acpi_device_bid(device), acpi_lid_dir);
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if (!acpi_device_dir(device)) {
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ret = -ENODEV;
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goto remove_lid_dir;
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}
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/* create /proc/acpi/button/lid/LID/state */
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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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ret = -ENODEV;
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goto remove_dev_dir;
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}
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done:
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return ret;
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remove_dev_dir:
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remove_proc_entry(acpi_device_bid(device),
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acpi_lid_dir);
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acpi_device_dir(device) = NULL;
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remove_lid_dir:
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remove_proc_entry(ACPI_BUTTON_SUBCLASS_LID, acpi_button_dir);
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acpi_lid_dir = NULL;
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remove_button_dir:
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remove_proc_entry(ACPI_BUTTON_CLASS, acpi_root_dir);
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acpi_button_dir = NULL;
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goto done;
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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 (button->type != ACPI_BUTTON_TYPE_LID)
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return 0;
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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_device_bid(device),
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acpi_lid_dir);
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acpi_device_dir(device) = NULL;
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remove_proc_entry(ACPI_BUTTON_SUBCLASS_LID, acpi_button_dir);
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acpi_lid_dir = NULL;
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remove_proc_entry(ACPI_BUTTON_CLASS, acpi_root_dir);
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acpi_button_dir = NULL;
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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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if (!lid_device)
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return -ENODEV;
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return acpi_lid_evaluate_state(lid_device);
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}
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EXPORT_SYMBOL(acpi_lid_open);
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static int acpi_lid_update_state(struct acpi_device *device)
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{
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int state;
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state = acpi_lid_evaluate_state(device);
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if (state < 0)
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return state;
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return acpi_lid_notify_state(device, state);
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}
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static void acpi_lid_initialize_state(struct acpi_device *device)
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{
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switch (lid_init_state) {
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case ACPI_BUTTON_LID_INIT_OPEN:
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(void)acpi_lid_notify_state(device, 1);
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break;
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case ACPI_BUTTON_LID_INIT_IGNORE:
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default:
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break;
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}
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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_update_state(device);
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} else {
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int keycode;
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pm_wakeup_event(&device->dev, 0);
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if (button->suspended)
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break;
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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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acpi_bus_generate_netlink_event(
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device->pnp.device_class,
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dev_name(&device->dev),
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event, ++button->pushed);
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}
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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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#ifdef CONFIG_PM_SLEEP
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static int acpi_button_suspend(struct device *dev)
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{
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struct acpi_device *device = to_acpi_device(dev);
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struct acpi_button *button = acpi_driver_data(device);
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button->suspended = true;
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return 0;
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}
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static int acpi_button_resume(struct device *dev)
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{
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struct acpi_device *device = to_acpi_device(dev);
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struct acpi_button *button = acpi_driver_data(device);
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button->suspended = false;
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if (button->type == ACPI_BUTTON_TYPE_LID)
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acpi_lid_initialize_state(device);
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return 0;
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}
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#endif
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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);
|
|
button->last_state = !!acpi_lid_evaluate_state(device);
|
|
button->last_time = ktime_get();
|
|
} 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;
|
|
}
|
|
|
|
error = input_register_device(input);
|
|
if (error)
|
|
goto err_remove_fs;
|
|
if (button->type == ACPI_BUTTON_TYPE_LID) {
|
|
acpi_lid_initialize_state(device);
|
|
/*
|
|
* This assumes there's only one lid device, or if there are
|
|
* more we only care about the last one...
|
|
*/
|
|
lid_device = device;
|
|
}
|
|
|
|
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, 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, "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, struct kernel_param *kp)
|
|
{
|
|
switch (lid_init_state) {
|
|
case ACPI_BUTTON_LID_INIT_OPEN:
|
|
return sprintf(buffer, "open");
|
|
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");
|
|
|
|
module_acpi_driver(acpi_button_driver);
|