LXR linux/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
  26struct topstar_hkey {
  27        struct input_dev *inputdev;
  28};
  29
  30static 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
  60static 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
  80static int acpi_topstar_fncx_switch(struct acpi_device *device, bool state)
  81{
  82        acpi_status status;
  83
  84        status = acpi_execute_simple_method(device->handle, "FNCX",
  85                                                state ? 0x86 : 0x87);
  86        if (ACPI_FAILURE(status)) {
  87                pr_err("Unable to switch FNCX notifications\n");
  88                return -ENODEV;
  89        }
  90
  91        return 0;
  92}
  93
  94static int acpi_topstar_init_hkey(struct topstar_hkey *hkey)
  95{
  96        struct input_dev *input;
  97        int error;
  98
  99        input = input_allocate_device();
 100        if (!input)
 101                return -ENOMEM;
 102
 103        input->name = "Topstar Laptop extra buttons";
 104        input->phys = "topstar/input0";
 105        input->id.bustype = BUS_HOST;
 106
 107        error = sparse_keymap_setup(input, topstar_keymap, NULL);
 108        if (error) {
 109                pr_err("Unable to setup input device keymap\n");
 110                goto err_free_dev;
 111        }
 112
 113        error = input_register_device(input);
 114        if (error) {
 115                pr_err("Unable to register input device\n");
 116                goto err_free_dev;
 117        }
 118
 119        hkey->inputdev = input;
 120        return 0;
 121
 122 err_free_dev:
 123        input_free_device(input);
 124        return error;
 125}
 126
 127static int acpi_topstar_add(struct acpi_device *device)
 128{
 129        struct topstar_hkey *tps_hkey;
 130
 131        tps_hkey = kzalloc(sizeof(struct topstar_hkey), GFP_KERNEL);
 132        if (!tps_hkey)
 133                return -ENOMEM;
 134
 135        strcpy(acpi_device_name(device), "Topstar TPSACPI");
 136        strcpy(acpi_device_class(device), ACPI_TOPSTAR_CLASS);
 137
 138        if (acpi_topstar_fncx_switch(device, true))
 139                goto add_err;
 140
 141        if (acpi_topstar_init_hkey(tps_hkey))
 142                goto add_err;
 143
 144        device->driver_data = tps_hkey;
 145        return 0;
 146
 147add_err:
 148        kfree(tps_hkey);
 149        return -ENODEV;
 150}
 151
 152static int acpi_topstar_remove(struct acpi_device *device)
 153{
 154        struct topstar_hkey *tps_hkey = acpi_driver_data(device);
 155
 156        acpi_topstar_fncx_switch(device, false);
 157
 158        input_unregister_device(tps_hkey->inputdev);
 159        kfree(tps_hkey);
 160
 161        return 0;
 162}
 163
 164static const struct acpi_device_id topstar_device_ids[] = {
 165        { "TPS0001", 0 },
 166        { "TPSACPI01", 0 },
 167        { "", 0 },
 168};
 169MODULE_DEVICE_TABLE(acpi, topstar_device_ids);
 170
 171static struct acpi_driver acpi_topstar_driver = {
 172        .name = "Topstar laptop ACPI driver",
 173        .class = ACPI_TOPSTAR_CLASS,
 174        .ids = topstar_device_ids,
 175        .ops = {
 176                .add = acpi_topstar_add,
 177                .remove = acpi_topstar_remove,
 178                .notify = acpi_topstar_notify,
 179        },
 180};
 181module_acpi_driver(acpi_topstar_driver);
 182
 183MODULE_AUTHOR("Herton Ronaldo Krzesinski");
 184MODULE_DESCRIPTION("Topstar Laptop ACPI Extras driver");
 185MODULE_LICENSE("GPL");
 186