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
 29MODULE_LICENSE("GPL");
 30MODULE_AUTHOR("Alex Hung");
 31MODULE_ALIAS("acpi*:HPQ6001:*");
 32MODULE_ALIAS("acpi*:WSTADEF:*");
 33
 34static struct input_dev *hpwl_input_dev;
 35
 36static const struct acpi_device_id hpwl_ids[] = {
 37	{"HPQ6001", 0},
 38	{"WSTADEF", 0},
 39	{"", 0},
 40};
 41
 42static 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
 62err_free_dev:
 63	input_free_device(hpwl_input_dev);
 64	return err;
 65}
 66
 67static void hp_wireless_input_destroy(void)
 68{
 69	input_unregister_device(hpwl_input_dev);
 70}
 71
 72static 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
 85static 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
 96static int hpwl_remove(struct acpi_device *device)
 97{
 98	hp_wireless_input_destroy();
 99	return 0;
100}
101
102static 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
113module_acpi_driver(hpwl_driver);