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In all cases in which a struct acpi_driver is used for binding a driver to an ACPI device object, a corresponding platform device is created by the ACPI core and that device is regarded as a proper representation of underlying hardware. Accordingly, a struct platform_driver should be used by driver code to bind to that device. There are multiple reasons why drivers should not bind directly to ACPI device objects [1]. Overall, it is better to bind drivers to platform devices than to their ACPI companions, so convert the airplane mode button for AMD, HP and Xiaomi laptops driver from an ACPI driver to a platform one. While this is not expected to alter functionality, it changes sysfs layout and so it will be visible to user space. Link: https://lore.kernel.org/all/2396510.ElGaqSPkdT@rafael.j.wysocki/ [1] Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com> Link: https://patch.msgid.link/9607409.CDJkKcVGEf@rafael.j.wysocki Reviewed-by: Ilpo Järvinen <ilpo.jarvinen@linux.intel.com> Signed-off-by: Ilpo Järvinen <ilpo.jarvinen@linux.intel.com>
134 lines
3.0 KiB
C
134 lines
3.0 KiB
C
// SPDX-License-Identifier: GPL-2.0-or-later
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/*
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* Airplane mode button for AMD, HP & Xiaomi laptops
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*
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* Copyright (C) 2014-2017 Alex Hung <alex.hung@canonical.com>
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* Copyright (C) 2021 Advanced Micro Devices
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*/
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#include <linux/kernel.h>
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#include <linux/module.h>
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#include <linux/init.h>
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#include <linux/input.h>
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#include <linux/platform_device.h>
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#include <linux/acpi.h>
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#include <acpi/acpi_bus.h>
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MODULE_DESCRIPTION("Airplane mode button for AMD, HP & Xiaomi laptops");
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MODULE_LICENSE("GPL");
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MODULE_AUTHOR("Alex Hung");
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MODULE_ALIAS("acpi*:HPQ6001:*");
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MODULE_ALIAS("acpi*:WSTADEF:*");
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MODULE_ALIAS("acpi*:AMDI0051:*");
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MODULE_ALIAS("acpi*:LGEX0815:*");
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struct wl_button {
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struct input_dev *input_dev;
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char phys[32];
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};
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static const struct acpi_device_id wl_ids[] = {
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{"HPQ6001", 0},
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{"WSTADEF", 0},
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{"AMDI0051", 0},
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{"LGEX0815", 0},
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{"", 0},
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};
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static int wireless_input_setup(struct device *dev)
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{
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struct wl_button *button = dev_get_drvdata(dev);
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int err;
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button->input_dev = input_allocate_device();
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if (!button->input_dev)
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return -ENOMEM;
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snprintf(button->phys, sizeof(button->phys), "%s/input0",
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acpi_device_hid(ACPI_COMPANION(dev)));
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button->input_dev->name = "Wireless hotkeys";
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button->input_dev->phys = button->phys;
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button->input_dev->id.bustype = BUS_HOST;
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button->input_dev->evbit[0] = BIT(EV_KEY);
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set_bit(KEY_RFKILL, button->input_dev->keybit);
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err = input_register_device(button->input_dev);
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if (err)
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goto err_free_dev;
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return 0;
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err_free_dev:
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input_free_device(button->input_dev);
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return err;
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}
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static void wireless_input_destroy(struct device *dev)
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{
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struct wl_button *button = dev_get_drvdata(dev);
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input_unregister_device(button->input_dev);
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kfree(button);
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}
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static void wl_notify(acpi_handle handle, u32 event, void *data)
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{
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struct wl_button *button = data;
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if (event != 0x80) {
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pr_info("Received unknown event (0x%x)\n", event);
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return;
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}
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input_report_key(button->input_dev, KEY_RFKILL, 1);
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input_sync(button->input_dev);
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input_report_key(button->input_dev, KEY_RFKILL, 0);
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input_sync(button->input_dev);
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}
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static int wl_probe(struct platform_device *pdev)
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{
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struct wl_button *button;
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int err;
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button = kzalloc_obj(struct wl_button);
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if (!button)
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return -ENOMEM;
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platform_set_drvdata(pdev, button);
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err = wireless_input_setup(&pdev->dev);
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if (err) {
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pr_err("Failed to setup wireless hotkeys\n");
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kfree(button);
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return err;
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}
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err = acpi_dev_install_notify_handler(ACPI_COMPANION(&pdev->dev),
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ACPI_DEVICE_NOTIFY, wl_notify, button);
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if (err) {
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pr_err("Failed to install ACPI notify handler\n");
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wireless_input_destroy(&pdev->dev);
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}
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return err;
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}
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static void wl_remove(struct platform_device *pdev)
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{
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acpi_dev_remove_notify_handler(ACPI_COMPANION(&pdev->dev),
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ACPI_DEVICE_NOTIFY, wl_notify);
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wireless_input_destroy(&pdev->dev);
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}
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static struct platform_driver wl_driver = {
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.probe = wl_probe,
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.remove = wl_remove,
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.driver = {
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.name = "wireless-hotkey",
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.acpi_match_table = wl_ids,
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},
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};
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module_platform_driver(wl_driver);
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