drivers/platform/x86/hp-wireless.c

   1 /*
   2  *  Airplane mode button for HP & Xiaomi laptops
   3  *
   4  *  Copyright (C) 2014-2017 Alex Hung <alex.hung@canonical.com>
   5  *
   6  *  This program is free software; you can redistribute it and/or modify
   7  *  it under the terms of the GNU General Public License as published by
   8  *  the Free Software Foundation; either version 2 of the License, or
   9  *  (at your option) any later version.
  10  *
  11  *  This program is distributed in the hope that it will be useful,
  12  *  but WITHOUT ANY WARRANTY; without even the implied warranty of
  13  *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  14  *  GNU General Public License for more details.
  15  *
  16  *  You should have received a copy of the GNU General Public License along
  17  *  with this program; if not, write to the Free Software Foundation, Inc.,
  18  *  51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
  19  */
  20
  21 #include <linux/kernel.h>
  22 #include <linux/module.h>
  23 #include <linux/init.h>
  24 #include <linux/input.h>
  25 #include <linux/platform_device.h>
  26 #include <linux/acpi.h>
  27 #include <acpi/acpi_bus.h>
  28
  29 MODULE_LICENSE("GPL");
  30 MODULE_AUTHOR("Alex Hung");
  31 MODULE_ALIAS("acpi*:HPQ6001:*");
  32 MODULE_ALIAS("acpi*:WSTADEF:*");
  33
  34 static struct input_dev *hpwl_input_dev;
  35
  36 static const struct acpi_device_id hpwl_ids[] = {
  37         {"HPQ6001", 0},
  38         {"WSTADEF", 0},
  39         {"", 0},
  40 };
  41
  42 static int hp_wireless_input_setup(void)
  43 {
  44         int err;
  45
  46         hpwl_input_dev = input_allocate_device();
  47         if (!hpwl_input_dev)
  48                 return -ENOMEM;
  49
  50         hpwl_input_dev->name = "HP Wireless hotkeys";
  51         hpwl_input_dev->phys = "hpq6001/input0";
  52         hpwl_input_dev->id.bustype = BUS_HOST;
  53         hpwl_input_dev->evbit[0] = BIT(EV_KEY);
  54         set_bit(KEY_RFKILL, hpwl_input_dev->keybit);
  55
  56         err = input_register_device(hpwl_input_dev);
  57         if (err)
  58                 goto err_free_dev;
  59
  60         return 0;
  61
  62 err_free_dev:
  63         input_free_device(hpwl_input_dev);
  64         return err;
  65 }
  66
  67 static void hp_wireless_input_destroy(void)
  68 {
  69         input_unregister_device(hpwl_input_dev);
  70 }
  71
  72 static void hpwl_notify(struct acpi_device *acpi_dev, u32 event)
  73 {
  74         if (event != 0x80) {
  75                 pr_info("Received unknown event (0x%x)\n", event);
  76                 return;
  77         }
  78
  79         input_report_key(hpwl_input_dev, KEY_RFKILL, 1);
  80         input_sync(hpwl_input_dev);
  81         input_report_key(hpwl_input_dev, KEY_RFKILL, 0);
  82         input_sync(hpwl_input_dev);
  83 }
  84
  85 static int hpwl_add(struct acpi_device *device)
  86 {
  87         int err;
  88
  89         err = hp_wireless_input_setup();
  90         if (err)
  91                 pr_err("Failed to setup hp wireless hotkeys\n");
  92
  93         return err;
  94 }
  95
  96 static int hpwl_remove(struct acpi_device *device)
  97 {
  98         hp_wireless_input_destroy();
  99         return 0;
 100 }
 101
 102 static struct acpi_driver hpwl_driver = {
 103         .name   = "hp-wireless",
 104         .owner  = THIS_MODULE,
 105         .ids    = hpwl_ids,
 106         .ops    = {
 107                 .add    = hpwl_add,
 108                 .remove = hpwl_remove,
 109                 .notify = hpwl_notify,
 110         },
 111 };
 112
 113 module_acpi_driver(hpwl_driver);