drivers/platform/x86/wireless-hotkey.c

   1 // SPDX-License-Identifier: GPL-2.0-or-later
   2 /*
   3  *  Airplane mode button for AMD, HP & Xiaomi laptops
   4  *
   5  *  Copyright (C) 2014-2017 Alex Hung <alex.hung@canonical.com>
   6  *  Copyright (C) 2021 Advanced Micro Devices
   7  */
   8
   9 #include <linux/kernel.h>
  10 #include <linux/module.h>
  11 #include <linux/init.h>
  12 #include <linux/input.h>
  13 #include <linux/platform_device.h>
  14 #include <linux/acpi.h>
  15 #include <acpi/acpi_bus.h>
  16
  17 MODULE_LICENSE("GPL");
  18 MODULE_AUTHOR("Alex Hung");
  19 MODULE_ALIAS("acpi*:HPQ6001:*");
  20 MODULE_ALIAS("acpi*:WSTADEF:*");
  21 MODULE_ALIAS("acpi*:AMDI0051:*");
  22
  23 static struct input_dev *wl_input_dev;
  24
  25 static const struct acpi_device_id wl_ids[] = {
  26         {"HPQ6001", 0},
  27         {"WSTADEF", 0},
  28         {"AMDI0051", 0},
  29         {"", 0},
  30 };
  31
  32 static int wireless_input_setup(void)
  33 {
  34         int err;
  35
  36         wl_input_dev = input_allocate_device();
  37         if (!wl_input_dev)
  38                 return -ENOMEM;
  39
  40         wl_input_dev->name = "Wireless hotkeys";
  41         wl_input_dev->phys = "hpq6001/input0";
  42         wl_input_dev->id.bustype = BUS_HOST;
  43         wl_input_dev->evbit[0] = BIT(EV_KEY);
  44         set_bit(KEY_RFKILL, wl_input_dev->keybit);
  45
  46         err = input_register_device(wl_input_dev);
  47         if (err)
  48                 goto err_free_dev;
  49
  50         return 0;
  51
  52 err_free_dev:
  53         input_free_device(wl_input_dev);
  54         return err;
  55 }
  56
  57 static void wireless_input_destroy(void)
  58 {
  59         input_unregister_device(wl_input_dev);
  60 }
  61
  62 static void wl_notify(struct acpi_device *acpi_dev, u32 event)
  63 {
  64         if (event != 0x80) {
  65                 pr_info("Received unknown event (0x%x)\n", event);
  66                 return;
  67         }
  68
  69         input_report_key(wl_input_dev, KEY_RFKILL, 1);
  70         input_sync(wl_input_dev);
  71         input_report_key(wl_input_dev, KEY_RFKILL, 0);
  72         input_sync(wl_input_dev);
  73 }
  74
  75 static int wl_add(struct acpi_device *device)
  76 {
  77         int err;
  78
  79         err = wireless_input_setup();
  80         if (err)
  81                 pr_err("Failed to setup wireless hotkeys\n");
  82
  83         return err;
  84 }
  85
  86 static int wl_remove(struct acpi_device *device)
  87 {
  88         wireless_input_destroy();
  89         return 0;
  90 }
  91
  92 static struct acpi_driver wl_driver = {
  93         .name   = "wireless-hotkey",
  94         .owner  = THIS_MODULE,
  95         .ids    = wl_ids,
  96         .ops    = {
  97                 .add    = wl_add,
  98                 .remove = wl_remove,
  99                 .notify = wl_notify,
 100         },
 101 };
 102
 103 module_acpi_driver(wl_driver);