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Linux/drivers/platform/x86/hp-wireless.c

  1 /*
  2  *  hp-wireless button for Windows 8
  3  *
  4  *  Copyright (C) 2014 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 
 33 static struct input_dev *hpwl_input_dev;
 34 
 35 static const struct acpi_device_id hpwl_ids[] = {
 36         {"HPQ6001", 0},
 37         {"", 0},
 38 };
 39 
 40 static int hp_wireless_input_setup(void)
 41 {
 42         int err;
 43 
 44         hpwl_input_dev = input_allocate_device();
 45         if (!hpwl_input_dev)
 46                 return -ENOMEM;
 47 
 48         hpwl_input_dev->name = "HP Wireless hotkeys";
 49         hpwl_input_dev->phys = "hpq6001/input0";
 50         hpwl_input_dev->id.bustype = BUS_HOST;
 51         hpwl_input_dev->evbit[0] = BIT(EV_KEY);
 52         set_bit(KEY_RFKILL, hpwl_input_dev->keybit);
 53 
 54         err = input_register_device(hpwl_input_dev);
 55         if (err)
 56                 goto err_free_dev;
 57 
 58         return 0;
 59 
 60 err_free_dev:
 61         input_free_device(hpwl_input_dev);
 62         return err;
 63 }
 64 
 65 static void hp_wireless_input_destroy(void)
 66 {
 67         input_unregister_device(hpwl_input_dev);
 68 }
 69 
 70 static void hpwl_notify(struct acpi_device *acpi_dev, u32 event)
 71 {
 72         if (event != 0x80) {
 73                 pr_info("Received unknown event (0x%x)\n", event);
 74                 return;
 75         }
 76 
 77         input_report_key(hpwl_input_dev, KEY_RFKILL, 1);
 78         input_sync(hpwl_input_dev);
 79         input_report_key(hpwl_input_dev, KEY_RFKILL, 0);
 80         input_sync(hpwl_input_dev);
 81 }
 82 
 83 static int hpwl_add(struct acpi_device *device)
 84 {
 85         int err;
 86 
 87         err = hp_wireless_input_setup();
 88         return err;
 89 }
 90 
 91 static int hpwl_remove(struct acpi_device *device)
 92 {
 93         hp_wireless_input_destroy();
 94         return 0;
 95 }
 96 
 97 static struct acpi_driver hpwl_driver = {
 98         .name   = "hp-wireless",
 99         .owner  = THIS_MODULE,
100         .ids    = hpwl_ids,
101         .ops    = {
102                 .add    = hpwl_add,
103                 .remove = hpwl_remove,
104                 .notify = hpwl_notify,
105         },
106 };
107 
108 static int __init hpwl_init(void)
109 {
110         int err;
111 
112         pr_info("Initializing HPQ6001 module\n");
113         err = acpi_bus_register_driver(&hpwl_driver);
114         if (err) {
115                 pr_err("Unable to register HP wireless control driver.\n");
116                 goto error_acpi_register;
117         }
118 
119         return 0;
120 
121 error_acpi_register:
122         return err;
123 }
124 
125 static void __exit hpwl_exit(void)
126 {
127         pr_info("Exiting HPQ6001 module\n");
128         acpi_bus_unregister_driver(&hpwl_driver);
129 }
130 
131 module_init(hpwl_init);
132 module_exit(hpwl_exit);
133 

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