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659 lines
17 KiB
659 lines
17 KiB
// SPDX-License-Identifier: GPL-2.0-or-later |
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/* |
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* button.c - ACPI Button Driver |
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* |
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* Copyright (C) 2001, 2002 Andy Grover <[email protected]> |
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* Copyright (C) 2001, 2002 Paul Diefenbaugh <[email protected]> |
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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/compiler.h> |
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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 <linux/dmi.h> |
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#include <acpi/button.h> |
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|
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#define ACPI_BUTTON_CLASS "button" |
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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_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_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_DEVICE_NAME_LID "Lid Switch" |
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#define ACPI_BUTTON_TYPE_LID 0x05 |
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enum { |
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ACPI_BUTTON_LID_INIT_IGNORE, |
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ACPI_BUTTON_LID_INIT_OPEN, |
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ACPI_BUTTON_LID_INIT_METHOD, |
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ACPI_BUTTON_LID_INIT_DISABLED, |
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}; |
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static const char * const lid_init_state_str[] = { |
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[ACPI_BUTTON_LID_INIT_IGNORE] = "ignore", |
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[ACPI_BUTTON_LID_INIT_OPEN] = "open", |
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[ACPI_BUTTON_LID_INIT_METHOD] = "method", |
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[ACPI_BUTTON_LID_INIT_DISABLED] = "disabled", |
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}; |
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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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/* Please keep this list sorted alphabetically by vendor and model */ |
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static const struct dmi_system_id dmi_lid_quirks[] = { |
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{ |
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/* GP-electronic T701, _LID method points to a floating GPIO */ |
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.matches = { |
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DMI_MATCH(DMI_SYS_VENDOR, "Insyde"), |
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DMI_MATCH(DMI_PRODUCT_NAME, "T701"), |
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DMI_MATCH(DMI_BIOS_VERSION, "BYT70A.YNCHENG.WIN.007"), |
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}, |
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.driver_data = (void *)(long)ACPI_BUTTON_LID_INIT_DISABLED, |
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}, |
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{ |
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/* |
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* Lenovo Yoga 9 14ITL5, initial notification of the LID device |
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* never happens. |
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*/ |
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.matches = { |
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DMI_MATCH(DMI_SYS_VENDOR, "LENOVO"), |
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DMI_MATCH(DMI_PRODUCT_NAME, "82BG"), |
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}, |
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.driver_data = (void *)(long)ACPI_BUTTON_LID_INIT_OPEN, |
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}, |
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{ |
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/* |
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* Medion Akoya E2215T, notification of the LID device only |
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* happens on close, not on open and _LID always returns closed. |
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*/ |
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.matches = { |
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DMI_MATCH(DMI_SYS_VENDOR, "MEDION"), |
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DMI_MATCH(DMI_PRODUCT_NAME, "E2215T"), |
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}, |
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.driver_data = (void *)(long)ACPI_BUTTON_LID_INIT_OPEN, |
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}, |
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{ |
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/* |
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* Medion Akoya E2228T, notification of the LID device only |
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* happens on close, not on open and _LID always returns closed. |
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*/ |
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.matches = { |
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DMI_MATCH(DMI_SYS_VENDOR, "MEDION"), |
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DMI_MATCH(DMI_PRODUCT_NAME, "E2228T"), |
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}, |
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.driver_data = (void *)(long)ACPI_BUTTON_LID_INIT_OPEN, |
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}, |
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{ |
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/* |
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* Razer Blade Stealth 13 late 2019, notification of the LID device |
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* only happens on close, not on open and _LID always returns closed. |
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*/ |
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.matches = { |
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DMI_MATCH(DMI_SYS_VENDOR, "Razer"), |
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DMI_MATCH(DMI_PRODUCT_NAME, "Razer Blade Stealth 13 Late 2019"), |
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}, |
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.driver_data = (void *)(long)ACPI_BUTTON_LID_INIT_OPEN, |
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}, |
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{} |
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}; |
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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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bool lid_state_initialized; |
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}; |
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static struct acpi_device *lid_device; |
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static long lid_init_state = -1; |
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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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/* FS Interface (/proc) */ |
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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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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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acpi_handle_debug(device->handle, "ACPI LID %s\n", |
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state ? "open" : "closed"); |
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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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return 0; |
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} |
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static int __maybe_unused acpi_button_state_seq_show(struct seq_file *seq, |
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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_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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pr_info("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_single_data(ACPI_BUTTON_FILE_STATE, S_IRUGO, |
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acpi_device_dir(device), acpi_button_state_seq_show, |
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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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/* Driver Interface */ |
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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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bool signal_wakeup) |
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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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if (state && signal_wakeup) |
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acpi_pm_wakeup_event(&device->dev); |
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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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struct acpi_button *button = acpi_driver_data(device); |
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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_METHOD: |
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(void)acpi_lid_update_state(device, false); |
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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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button->lid_state_initialized = true; |
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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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fallthrough; |
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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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if (button->lid_state_initialized) |
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acpi_lid_update_state(device, true); |
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} else { |
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int keycode; |
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acpi_pm_wakeup_event(&device->dev); |
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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_handle_debug(device->handle, "Unsupported event [0x%x]\n", |
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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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|
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button->suspended = false; |
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if (button->type == ACPI_BUTTON_TYPE_LID) { |
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button->last_state = !!acpi_lid_evaluate_state(device); |
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button->last_time = ktime_get(); |
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acpi_lid_initialize_state(device); |
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} |
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return 0; |
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} |
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#endif |
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static int acpi_lid_input_open(struct input_dev *input) |
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{ |
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struct acpi_device *device = input_get_drvdata(input); |
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struct acpi_button *button = acpi_driver_data(device); |
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button->last_state = !!acpi_lid_evaluate_state(device); |
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button->last_time = ktime_get(); |
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acpi_lid_initialize_state(device); |
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|
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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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if (!strcmp(hid, ACPI_BUTTON_HID_LID) && |
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lid_init_state == ACPI_BUTTON_LID_INIT_DISABLED) |
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return -ENODEV; |
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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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input->open = acpi_lid_input_open; |
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} else { |
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pr_info("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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|
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snprintf(button->phys, sizeof(button->phys), "%s/button/input0", hid); |
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|
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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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|
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switch (button->type) { |
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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); |
|
pr_info("%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 i; |
|
|
|
i = sysfs_match_string(lid_init_state_str, val); |
|
if (i < 0) |
|
return i; |
|
|
|
lid_init_state = i; |
|
pr_info("Initial lid state set to '%s'\n", lid_init_state_str[i]); |
|
return 0; |
|
} |
|
|
|
static int param_get_lid_init_state(char *buf, const struct kernel_param *kp) |
|
{ |
|
int i, c = 0; |
|
|
|
for (i = 0; i < ARRAY_SIZE(lid_init_state_str); i++) |
|
if (i == lid_init_state) |
|
c += sprintf(buf + c, "[%s] ", lid_init_state_str[i]); |
|
else |
|
c += sprintf(buf + c, "%s ", lid_init_state_str[i]); |
|
|
|
buf[c - 1] = '\n'; /* Replace the final space with a newline */ |
|
|
|
return c; |
|
} |
|
|
|
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) |
|
{ |
|
const struct dmi_system_id *dmi_id; |
|
|
|
if (lid_init_state == -1) { |
|
dmi_id = dmi_first_match(dmi_lid_quirks); |
|
if (dmi_id) |
|
lid_init_state = (long)dmi_id->driver_data; |
|
else |
|
lid_init_state = ACPI_BUTTON_LID_INIT_METHOD; |
|
} |
|
|
|
/* |
|
* 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);
|
|
|