drivers/platform/x86/hp-wireless.c

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