linux/drivers/platform/x86/msi-wmi.c
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   1/*
   2 * MSI WMI hotkeys
   3 *
   4 * Copyright (C) 2009 Novell <trenn@suse.de>
   5 *
   6 * Most stuff taken over from hp-wmi
   7 *
   8 *  This program is free software; you can redistribute it and/or modify
   9 *  it under the terms of the GNU General Public License as published by
  10 *  the Free Software Foundation; either version 2 of the License, or
  11 *  (at your option) any later version.
  12 *
  13 *  This program is distributed in the hope that it will be useful,
  14 *  but WITHOUT ANY WARRANTY; without even the implied warranty of
  15 *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  16 *  GNU General Public License for more details.
  17 *
  18 *  You should have received a copy of the GNU General Public License
  19 *  along with this program; if not, write to the Free Software
  20 *  Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
  21 */
  22
  23#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
  24
  25#include <linux/kernel.h>
  26#include <linux/input.h>
  27#include <linux/input/sparse-keymap.h>
  28#include <linux/acpi.h>
  29#include <linux/backlight.h>
  30#include <linux/slab.h>
  31#include <linux/module.h>
  32#include <acpi/video.h>
  33
  34MODULE_AUTHOR("Thomas Renninger <trenn@suse.de>");
  35MODULE_DESCRIPTION("MSI laptop WMI hotkeys driver");
  36MODULE_LICENSE("GPL");
  37
  38#define DRV_NAME "msi-wmi"
  39
  40#define MSIWMI_BIOS_GUID "551A1F84-FBDD-4125-91DB-3EA8F44F1D45"
  41#define MSIWMI_MSI_EVENT_GUID "B6F3EEF2-3D2F-49DC-9DE3-85BCE18C62F2"
  42#define MSIWMI_WIND_EVENT_GUID "5B3CC38A-40D9-7245-8AE6-1145B751BE3F"
  43
  44MODULE_ALIAS("wmi:" MSIWMI_BIOS_GUID);
  45MODULE_ALIAS("wmi:" MSIWMI_MSI_EVENT_GUID);
  46MODULE_ALIAS("wmi:" MSIWMI_WIND_EVENT_GUID);
  47
  48enum msi_scancodes {
  49        /* Generic MSI keys (not present on MSI Wind) */
  50        MSI_KEY_BRIGHTNESSUP    = 0xD0,
  51        MSI_KEY_BRIGHTNESSDOWN,
  52        MSI_KEY_VOLUMEUP,
  53        MSI_KEY_VOLUMEDOWN,
  54        MSI_KEY_MUTE,
  55        /* MSI Wind keys */
  56        WIND_KEY_TOUCHPAD       = 0x08, /* Fn+F3 touchpad toggle */
  57        WIND_KEY_BLUETOOTH      = 0x56, /* Fn+F11 Bluetooth toggle */
  58        WIND_KEY_CAMERA,                /* Fn+F6 webcam toggle */
  59        WIND_KEY_WLAN           = 0x5f, /* Fn+F11 Wi-Fi toggle */
  60        WIND_KEY_TURBO,                 /* Fn+F10 turbo mode toggle */
  61        WIND_KEY_ECO            = 0x69, /* Fn+F10 ECO mode toggle */
  62};
  63static struct key_entry msi_wmi_keymap[] = {
  64        { KE_KEY, MSI_KEY_BRIGHTNESSUP,         {KEY_BRIGHTNESSUP} },
  65        { KE_KEY, MSI_KEY_BRIGHTNESSDOWN,       {KEY_BRIGHTNESSDOWN} },
  66        { KE_KEY, MSI_KEY_VOLUMEUP,             {KEY_VOLUMEUP} },
  67        { KE_KEY, MSI_KEY_VOLUMEDOWN,           {KEY_VOLUMEDOWN} },
  68        { KE_KEY, MSI_KEY_MUTE,                 {KEY_MUTE} },
  69
  70        /* These keys work without WMI. Ignore them to avoid double keycodes */
  71        { KE_IGNORE, WIND_KEY_TOUCHPAD,         {KEY_TOUCHPAD_TOGGLE} },
  72        { KE_IGNORE, WIND_KEY_BLUETOOTH,        {KEY_BLUETOOTH} },
  73        { KE_IGNORE, WIND_KEY_CAMERA,           {KEY_CAMERA} },
  74        { KE_IGNORE, WIND_KEY_WLAN,             {KEY_WLAN} },
  75
  76        /* These are unknown WMI events found on MSI Wind */
  77        { KE_IGNORE, 0x00 },
  78        { KE_IGNORE, 0x62 },
  79        { KE_IGNORE, 0x63 },
  80
  81        /* These are MSI Wind keys that should be handled via WMI */
  82        { KE_KEY, WIND_KEY_TURBO,               {KEY_PROG1} },
  83        { KE_KEY, WIND_KEY_ECO,                 {KEY_PROG2} },
  84
  85        { KE_END, 0 }
  86};
  87
  88static ktime_t last_pressed;
  89
  90static const struct {
  91        const char *guid;
  92        bool quirk_last_pressed;
  93} *event_wmi, event_wmis[] = {
  94        { MSIWMI_MSI_EVENT_GUID, true },
  95        { MSIWMI_WIND_EVENT_GUID, false },
  96};
  97
  98static struct backlight_device *backlight;
  99
 100static int backlight_map[] = { 0x00, 0x33, 0x66, 0x99, 0xCC, 0xFF };
 101
 102static struct input_dev *msi_wmi_input_dev;
 103
 104static int msi_wmi_query_block(int instance, int *ret)
 105{
 106        acpi_status status;
 107        union acpi_object *obj;
 108
 109        struct acpi_buffer output = { ACPI_ALLOCATE_BUFFER, NULL };
 110
 111        status = wmi_query_block(MSIWMI_BIOS_GUID, instance, &output);
 112
 113        obj = output.pointer;
 114
 115        if (!obj || obj->type != ACPI_TYPE_INTEGER) {
 116                if (obj) {
 117                        pr_err("query block returned object "
 118                               "type: %d - buffer length:%d\n", obj->type,
 119                               obj->type == ACPI_TYPE_BUFFER ?
 120                               obj->buffer.length : 0);
 121                }
 122                kfree(obj);
 123                return -EINVAL;
 124        }
 125        *ret = obj->integer.value;
 126        kfree(obj);
 127        return 0;
 128}
 129
 130static int msi_wmi_set_block(int instance, int value)
 131{
 132        acpi_status status;
 133
 134        struct acpi_buffer input = { sizeof(int), &value };
 135
 136        pr_debug("Going to set block of instance: %d - value: %d\n",
 137                 instance, value);
 138
 139        status = wmi_set_block(MSIWMI_BIOS_GUID, instance, &input);
 140
 141        return ACPI_SUCCESS(status) ? 0 : 1;
 142}
 143
 144static int bl_get(struct backlight_device *bd)
 145{
 146        int level, err, ret;
 147
 148        /* Instance 1 is "get backlight", cmp with DSDT */
 149        err = msi_wmi_query_block(1, &ret);
 150        if (err) {
 151                pr_err("Could not query backlight: %d\n", err);
 152                return -EINVAL;
 153        }
 154        pr_debug("Get: Query block returned: %d\n", ret);
 155        for (level = 0; level < ARRAY_SIZE(backlight_map); level++) {
 156                if (backlight_map[level] == ret) {
 157                        pr_debug("Current backlight level: 0x%X - index: %d\n",
 158                                 backlight_map[level], level);
 159                        break;
 160                }
 161        }
 162        if (level == ARRAY_SIZE(backlight_map)) {
 163                pr_err("get: Invalid brightness value: 0x%X\n", ret);
 164                return -EINVAL;
 165        }
 166        return level;
 167}
 168
 169static int bl_set_status(struct backlight_device *bd)
 170{
 171        int bright = bd->props.brightness;
 172        if (bright >= ARRAY_SIZE(backlight_map) || bright < 0)
 173                return -EINVAL;
 174
 175        /* Instance 0 is "set backlight" */
 176        return msi_wmi_set_block(0, backlight_map[bright]);
 177}
 178
 179static const struct backlight_ops msi_backlight_ops = {
 180        .get_brightness = bl_get,
 181        .update_status  = bl_set_status,
 182};
 183
 184static void msi_wmi_notify(u32 value, void *context)
 185{
 186        struct acpi_buffer response = { ACPI_ALLOCATE_BUFFER, NULL };
 187        struct key_entry *key;
 188        union acpi_object *obj;
 189        acpi_status status;
 190
 191        status = wmi_get_event_data(value, &response);
 192        if (status != AE_OK) {
 193                pr_info("bad event status 0x%x\n", status);
 194                return;
 195        }
 196
 197        obj = (union acpi_object *)response.pointer;
 198
 199        if (obj && obj->type == ACPI_TYPE_INTEGER) {
 200                int eventcode = obj->integer.value;
 201                pr_debug("Eventcode: 0x%x\n", eventcode);
 202                key = sparse_keymap_entry_from_scancode(msi_wmi_input_dev,
 203                                eventcode);
 204                if (!key) {
 205                        pr_info("Unknown key pressed - %x\n", eventcode);
 206                        goto msi_wmi_notify_exit;
 207                }
 208
 209                if (event_wmi->quirk_last_pressed) {
 210                        ktime_t cur = ktime_get_real();
 211                        ktime_t diff = ktime_sub(cur, last_pressed);
 212                        /* Ignore event if any event happened in a 50 ms
 213                           timeframe -> Key press may result in 10-20 GPEs */
 214                        if (ktime_to_us(diff) < 1000 * 50) {
 215                                pr_debug("Suppressed key event 0x%X - "
 216                                         "Last press was %lld us ago\n",
 217                                         key->code, ktime_to_us(diff));
 218                                goto msi_wmi_notify_exit;
 219                        }
 220                        last_pressed = cur;
 221                }
 222
 223                if (key->type == KE_KEY &&
 224                /* Brightness is served via acpi video driver */
 225                (backlight ||
 226                (key->code != MSI_KEY_BRIGHTNESSUP &&
 227                key->code != MSI_KEY_BRIGHTNESSDOWN))) {
 228                        pr_debug("Send key: 0x%X - Input layer keycode: %d\n",
 229                                 key->code, key->keycode);
 230                        sparse_keymap_report_entry(msi_wmi_input_dev, key, 1,
 231                                                   true);
 232                }
 233        } else
 234                pr_info("Unknown event received\n");
 235
 236msi_wmi_notify_exit:
 237        kfree(response.pointer);
 238}
 239
 240static int __init msi_wmi_backlight_setup(void)
 241{
 242        int err;
 243        struct backlight_properties props;
 244
 245        memset(&props, 0, sizeof(struct backlight_properties));
 246        props.type = BACKLIGHT_PLATFORM;
 247        props.max_brightness = ARRAY_SIZE(backlight_map) - 1;
 248        backlight = backlight_device_register(DRV_NAME, NULL, NULL,
 249                                              &msi_backlight_ops,
 250                                              &props);
 251        if (IS_ERR(backlight))
 252                return PTR_ERR(backlight);
 253
 254        err = bl_get(NULL);
 255        if (err < 0) {
 256                backlight_device_unregister(backlight);
 257                return err;
 258        }
 259
 260        backlight->props.brightness = err;
 261
 262        return 0;
 263}
 264
 265static int __init msi_wmi_input_setup(void)
 266{
 267        int err;
 268
 269        msi_wmi_input_dev = input_allocate_device();
 270        if (!msi_wmi_input_dev)
 271                return -ENOMEM;
 272
 273        msi_wmi_input_dev->name = "MSI WMI hotkeys";
 274        msi_wmi_input_dev->phys = "wmi/input0";
 275        msi_wmi_input_dev->id.bustype = BUS_HOST;
 276
 277        err = sparse_keymap_setup(msi_wmi_input_dev, msi_wmi_keymap, NULL);
 278        if (err)
 279                goto err_free_dev;
 280
 281        err = input_register_device(msi_wmi_input_dev);
 282
 283        if (err)
 284                goto err_free_dev;
 285
 286        last_pressed = 0;
 287
 288        return 0;
 289
 290err_free_dev:
 291        input_free_device(msi_wmi_input_dev);
 292        return err;
 293}
 294
 295static int __init msi_wmi_init(void)
 296{
 297        int err;
 298        int i;
 299
 300        for (i = 0; i < ARRAY_SIZE(event_wmis); i++) {
 301                if (!wmi_has_guid(event_wmis[i].guid))
 302                        continue;
 303
 304                err = msi_wmi_input_setup();
 305                if (err) {
 306                        pr_err("Unable to setup input device\n");
 307                        return err;
 308                }
 309
 310                err = wmi_install_notify_handler(event_wmis[i].guid,
 311                        msi_wmi_notify, NULL);
 312                if (ACPI_FAILURE(err)) {
 313                        pr_err("Unable to setup WMI notify handler\n");
 314                        goto err_free_input;
 315                }
 316
 317                pr_debug("Event handler installed\n");
 318                event_wmi = &event_wmis[i];
 319                break;
 320        }
 321
 322        if (wmi_has_guid(MSIWMI_BIOS_GUID) &&
 323            acpi_video_get_backlight_type() == acpi_backlight_vendor) {
 324                err = msi_wmi_backlight_setup();
 325                if (err) {
 326                        pr_err("Unable to setup backlight device\n");
 327                        goto err_uninstall_handler;
 328                }
 329                pr_debug("Backlight device created\n");
 330        }
 331
 332        if (!event_wmi && !backlight) {
 333                pr_err("This machine doesn't have neither MSI-hotkeys nor backlight through WMI\n");
 334                return -ENODEV;
 335        }
 336
 337        return 0;
 338
 339err_uninstall_handler:
 340        if (event_wmi)
 341                wmi_remove_notify_handler(event_wmi->guid);
 342err_free_input:
 343        if (event_wmi)
 344                input_unregister_device(msi_wmi_input_dev);
 345        return err;
 346}
 347
 348static void __exit msi_wmi_exit(void)
 349{
 350        if (event_wmi) {
 351                wmi_remove_notify_handler(event_wmi->guid);
 352                input_unregister_device(msi_wmi_input_dev);
 353        }
 354        backlight_device_unregister(backlight);
 355}
 356
 357module_init(msi_wmi_init);
 358module_exit(msi_wmi_exit);
 359