drivers/platform/x86/topstar-laptop.c

   1 /*
   2  * ACPI driver for Topstar notebooks (hotkeys support only)
   3  *
   4  * Copyright (c) 2009 Herton Ronaldo Krzesinski <herton@mandriva.com.br>
   5  *
   6  * Implementation inspired by existing x86 platform drivers, in special
   7  * asus/eepc/fujitsu-laptop, thanks to their authors
   8  *
   9  * This program is free software; you can redistribute it and/or modify
  10  * it under the terms of the GNU General Public License version 2 as
  11  * published by the Free Software Foundation.
  12  */
  13
  14 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
  15
  16 #include <linux/kernel.h>
  17 #include <linux/module.h>
  18 #include <linux/init.h>
  19 #include <linux/slab.h>
  20 #include <linux/acpi.h>
  21 #include <linux/input.h>
  22 #include <linux/input/sparse-keymap.h>
  23
  24 #define ACPI_TOPSTAR_CLASS "topstar"
  25
  26 struct topstar_hkey {
  27         struct input_dev *inputdev;
  28 };
  29
  30 static const struct key_entry topstar_keymap[] = {
  31         { KE_KEY, 0x80, { KEY_BRIGHTNESSUP } },
  32         { KE_KEY, 0x81, { KEY_BRIGHTNESSDOWN } },
  33         { KE_KEY, 0x83, { KEY_VOLUMEUP } },
  34         { KE_KEY, 0x84, { KEY_VOLUMEDOWN } },
  35         { KE_KEY, 0x85, { KEY_MUTE } },
  36         { KE_KEY, 0x86, { KEY_SWITCHVIDEOMODE } },
  37         { KE_KEY, 0x87, { KEY_F13 } }, /* touchpad enable/disable key */
  38         { KE_KEY, 0x88, { KEY_WLAN } },
  39         { KE_KEY, 0x8a, { KEY_WWW } },
  40         { KE_KEY, 0x8b, { KEY_MAIL } },
  41         { KE_KEY, 0x8c, { KEY_MEDIA } },
  42
  43         /* Known non hotkey events don't handled or that we don't care yet */
  44         { KE_IGNORE, 0x82, }, /* backlight event */
  45         { KE_IGNORE, 0x8e, },
  46         { KE_IGNORE, 0x8f, },
  47         { KE_IGNORE, 0x90, },
  48
  49         /*
  50          * 'G key' generate two event codes, convert to only
  51          * one event/key code for now, consider replacing by
  52          * a switch (3G switch - SW_3G?)
  53          */
  54         { KE_KEY, 0x96, { KEY_F14 } },
  55         { KE_KEY, 0x97, { KEY_F14 } },
  56
  57         { KE_END, 0 }
  58 };
  59
  60 static void acpi_topstar_notify(struct acpi_device *device, u32 event)
  61 {
  62         static bool dup_evnt[2];
  63         bool *dup;
  64         struct topstar_hkey *hkey = acpi_driver_data(device);
  65
  66         /* 0x83 and 0x84 key events comes duplicated... */
  67         if (event == 0x83 || event == 0x84) {
  68                 dup = &dup_evnt[event - 0x83];
  69                 if (*dup) {
  70                         *dup = false;
  71                         return;
  72                 }
  73                 *dup = true;
  74         }
  75
  76         if (!sparse_keymap_report_event(hkey->inputdev, event, 1, true))
  77                 pr_info("unknown event = 0x%02x\n", event);
  78 }
  79
  80 static int acpi_topstar_fncx_switch(struct acpi_device *device, bool state)
  81 {
  82         acpi_status status;
  83         union acpi_object fncx_params[1] = {
  84                 { .type = ACPI_TYPE_INTEGER }
  85         };
  86         struct acpi_object_list fncx_arg_list = { 1, &fncx_params[0] };
  87
  88         fncx_params[0].integer.value = state ? 0x86 : 0x87;
  89         status = acpi_evaluate_object(device->handle, "FNCX", &fncx_arg_list, NULL);
  90         if (ACPI_FAILURE(status)) {
  91                 pr_err("Unable to switch FNCX notifications\n");
  92                 return -ENODEV;
  93         }
  94
  95         return 0;
  96 }
  97
  98 static int acpi_topstar_init_hkey(struct topstar_hkey *hkey)
  99 {
 100         struct input_dev *input;
 101         int error;
 102
 103         input = input_allocate_device();
 104         if (!input) {
 105                 pr_err("Unable to allocate input device\n");
 106                 return -ENOMEM;
 107         }
 108
 109         input->name = "Topstar Laptop extra buttons";
 110         input->phys = "topstar/input0";
 111         input->id.bustype = BUS_HOST;
 112
 113         error = sparse_keymap_setup(input, topstar_keymap, NULL);
 114         if (error) {
 115                 pr_err("Unable to setup input device keymap\n");
 116                 goto err_free_dev;
 117         }
 118
 119         error = input_register_device(input);
 120         if (error) {
 121                 pr_err("Unable to register input device\n");
 122                 goto err_free_keymap;
 123         }
 124
 125         hkey->inputdev = input;
 126         return 0;
 127
 128  err_free_keymap:
 129         sparse_keymap_free(input);
 130  err_free_dev:
 131         input_free_device(input);
 132         return error;
 133 }
 134
 135 static int acpi_topstar_add(struct acpi_device *device)
 136 {
 137         struct topstar_hkey *tps_hkey;
 138
 139         tps_hkey = kzalloc(sizeof(struct topstar_hkey), GFP_KERNEL);
 140         if (!tps_hkey)
 141                 return -ENOMEM;
 142
 143         strcpy(acpi_device_name(device), "Topstar TPSACPI");
 144         strcpy(acpi_device_class(device), ACPI_TOPSTAR_CLASS);
 145
 146         if (acpi_topstar_fncx_switch(device, true))
 147                 goto add_err;
 148
 149         if (acpi_topstar_init_hkey(tps_hkey))
 150                 goto add_err;
 151
 152         device->driver_data = tps_hkey;
 153         return 0;
 154
 155 add_err:
 156         kfree(tps_hkey);
 157         return -ENODEV;
 158 }
 159
 160 static int acpi_topstar_remove(struct acpi_device *device, int type)
 161 {
 162         struct topstar_hkey *tps_hkey = acpi_driver_data(device);
 163
 164         acpi_topstar_fncx_switch(device, false);
 165
 166         sparse_keymap_free(tps_hkey->inputdev);
 167         input_unregister_device(tps_hkey->inputdev);
 168         kfree(tps_hkey);
 169
 170         return 0;
 171 }
 172
 173 static const struct acpi_device_id topstar_device_ids[] = {
 174         { "TPSACPI01", 0 },
 175         { "", 0 },
 176 };
 177 MODULE_DEVICE_TABLE(acpi, topstar_device_ids);
 178
 179 static struct acpi_driver acpi_topstar_driver = {
 180         .name = "Topstar laptop ACPI driver",
 181         .class = ACPI_TOPSTAR_CLASS,
 182         .ids = topstar_device_ids,
 183         .ops = {
 184                 .add = acpi_topstar_add,
 185                 .remove = acpi_topstar_remove,
 186                 .notify = acpi_topstar_notify,
 187         },
 188 };
 189
 190 static int __init topstar_laptop_init(void)
 191 {
 192         int ret;
 193
 194         ret = acpi_bus_register_driver(&acpi_topstar_driver);
 195         if (ret < 0)
 196                 return ret;
 197
 198         pr_info("ACPI extras driver loaded\n");
 199
 200         return 0;
 201 }
 202
 203 static void __exit topstar_laptop_exit(void)
 204 {
 205         acpi_bus_unregister_driver(&acpi_topstar_driver);
 206 }
 207
 208 module_init(topstar_laptop_init);
 209 module_exit(topstar_laptop_exit);
 210
 211 MODULE_AUTHOR("Herton Ronaldo Krzesinski");
 212 MODULE_DESCRIPTION("Topstar Laptop ACPI Extras driver");
 213 MODULE_LICENSE("GPL");