drivers/platform/x86/msi-wmi.c

   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
  33 MODULE_AUTHOR("Thomas Renninger <trenn@suse.de>");
  34 MODULE_DESCRIPTION("MSI laptop WMI hotkeys driver");
  35 MODULE_LICENSE("GPL");
  36
  37 MODULE_ALIAS("wmi:551A1F84-FBDD-4125-91DB-3EA8F44F1D45");
  38 MODULE_ALIAS("wmi:B6F3EEF2-3D2F-49DC-9DE3-85BCE18C62F2");
  39
  40 #define DRV_NAME "msi-wmi"
  41
  42 #define MSIWMI_BIOS_GUID "551A1F84-FBDD-4125-91DB-3EA8F44F1D45"
  43 #define MSIWMI_EVENT_GUID "B6F3EEF2-3D2F-49DC-9DE3-85BCE18C62F2"
  44
  45 #define SCANCODE_BASE 0xD0
  46 #define MSI_WMI_BRIGHTNESSUP   SCANCODE_BASE
  47 #define MSI_WMI_BRIGHTNESSDOWN (SCANCODE_BASE + 1)
  48 #define MSI_WMI_VOLUMEUP       (SCANCODE_BASE + 2)
  49 #define MSI_WMI_VOLUMEDOWN     (SCANCODE_BASE + 3)
  50 #define MSI_WMI_MUTE           (SCANCODE_BASE + 4)
  51 static struct key_entry msi_wmi_keymap[] = {
  52         { KE_KEY, MSI_WMI_BRIGHTNESSUP,   {KEY_BRIGHTNESSUP} },
  53         { KE_KEY, MSI_WMI_BRIGHTNESSDOWN, {KEY_BRIGHTNESSDOWN} },
  54         { KE_KEY, MSI_WMI_VOLUMEUP,       {KEY_VOLUMEUP} },
  55         { KE_KEY, MSI_WMI_VOLUMEDOWN,     {KEY_VOLUMEDOWN} },
  56         { KE_KEY, MSI_WMI_MUTE,           {KEY_MUTE} },
  57         { KE_END, 0}
  58 };
  59 static ktime_t last_pressed[ARRAY_SIZE(msi_wmi_keymap) - 1];
  60
  61 static struct backlight_device *backlight;
  62
  63 static int backlight_map[] = { 0x00, 0x33, 0x66, 0x99, 0xCC, 0xFF };
  64
  65 static struct input_dev *msi_wmi_input_dev;
  66
  67 static int msi_wmi_query_block(int instance, int *ret)
  68 {
  69         acpi_status status;
  70         union acpi_object *obj;
  71
  72         struct acpi_buffer output = { ACPI_ALLOCATE_BUFFER, NULL };
  73
  74         status = wmi_query_block(MSIWMI_BIOS_GUID, instance, &output);
  75
  76         obj = output.pointer;
  77
  78         if (!obj || obj->type != ACPI_TYPE_INTEGER) {
  79                 if (obj) {
  80                         pr_err("query block returned object "
  81                                "type: %d - buffer length:%d\n", obj->type,
  82                                obj->type == ACPI_TYPE_BUFFER ?
  83                                obj->buffer.length : 0);
  84                 }
  85                 kfree(obj);
  86                 return -EINVAL;
  87         }
  88         *ret = obj->integer.value;
  89         kfree(obj);
  90         return 0;
  91 }
  92
  93 static int msi_wmi_set_block(int instance, int value)
  94 {
  95         acpi_status status;
  96
  97         struct acpi_buffer input = { sizeof(int), &value };
  98
  99         pr_debug("Going to set block of instance: %d - value: %d\n",
 100                  instance, value);
 101
 102         status = wmi_set_block(MSIWMI_BIOS_GUID, instance, &input);
 103
 104         return ACPI_SUCCESS(status) ? 0 : 1;
 105 }
 106
 107 static int bl_get(struct backlight_device *bd)
 108 {
 109         int level, err, ret;
 110
 111         /* Instance 1 is "get backlight", cmp with DSDT */
 112         err = msi_wmi_query_block(1, &ret);
 113         if (err) {
 114                 pr_err("Could not query backlight: %d\n", err);
 115                 return -EINVAL;
 116         }
 117         pr_debug("Get: Query block returned: %d\n", ret);
 118         for (level = 0; level < ARRAY_SIZE(backlight_map); level++) {
 119                 if (backlight_map[level] == ret) {
 120                         pr_debug("Current backlight level: 0x%X - index: %d\n",
 121                                  backlight_map[level], level);
 122                         break;
 123                 }
 124         }
 125         if (level == ARRAY_SIZE(backlight_map)) {
 126                 pr_err("get: Invalid brightness value: 0x%X\n", ret);
 127                 return -EINVAL;
 128         }
 129         return level;
 130 }
 131
 132 static int bl_set_status(struct backlight_device *bd)
 133 {
 134         int bright = bd->props.brightness;
 135         if (bright >= ARRAY_SIZE(backlight_map) || bright < 0)
 136                 return -EINVAL;
 137
 138         /* Instance 0 is "set backlight" */
 139         return msi_wmi_set_block(0, backlight_map[bright]);
 140 }
 141
 142 static const struct backlight_ops msi_backlight_ops = {
 143         .get_brightness = bl_get,
 144         .update_status  = bl_set_status,
 145 };
 146
 147 static void msi_wmi_notify(u32 value, void *context)
 148 {
 149         struct acpi_buffer response = { ACPI_ALLOCATE_BUFFER, NULL };
 150         static struct key_entry *key;
 151         union acpi_object *obj;
 152         ktime_t cur;
 153         acpi_status status;
 154
 155         status = wmi_get_event_data(value, &response);
 156         if (status != AE_OK) {
 157                 pr_info("bad event status 0x%x\n", status);
 158                 return;
 159         }
 160
 161         obj = (union acpi_object *)response.pointer;
 162
 163         if (obj && obj->type == ACPI_TYPE_INTEGER) {
 164                 int eventcode = obj->integer.value;
 165                 pr_debug("Eventcode: 0x%x\n", eventcode);
 166                 key = sparse_keymap_entry_from_scancode(msi_wmi_input_dev,
 167                                 eventcode);
 168                 if (key) {
 169                         ktime_t diff;
 170                         cur = ktime_get_real();
 171                         diff = ktime_sub(cur, last_pressed[key->code -
 172                                         SCANCODE_BASE]);
 173                         /* Ignore event if the same event happened in a 50 ms
 174                            timeframe -> Key press may result in 10-20 GPEs */
 175                         if (ktime_to_us(diff) < 1000 * 50) {
 176                                 pr_debug("Suppressed key event 0x%X - "
 177                                          "Last press was %lld us ago\n",
 178                                          key->code, ktime_to_us(diff));
 179                                 return;
 180                         }
 181                         last_pressed[key->code - SCANCODE_BASE] = cur;
 182
 183                         if (key->type == KE_KEY &&
 184                         /* Brightness is served via acpi video driver */
 185                         (!acpi_video_backlight_support() ||
 186                         (key->code != MSI_WMI_BRIGHTNESSUP &&
 187                         key->code != MSI_WMI_BRIGHTNESSDOWN))) {
 188                                 pr_debug("Send key: 0x%X - "
 189                                          "Input layer keycode: %d\n",
 190                                          key->code, key->keycode);
 191                                 sparse_keymap_report_entry(msi_wmi_input_dev,
 192                                                 key, 1, true);
 193                         }
 194                 } else
 195                         pr_info("Unknown key pressed - %x\n", eventcode);
 196         } else
 197                 pr_info("Unknown event received\n");
 198         kfree(response.pointer);
 199 }
 200
 201 static int __init msi_wmi_input_setup(void)
 202 {
 203         int err;
 204
 205         msi_wmi_input_dev = input_allocate_device();
 206         if (!msi_wmi_input_dev)
 207                 return -ENOMEM;
 208
 209         msi_wmi_input_dev->name = "MSI WMI hotkeys";
 210         msi_wmi_input_dev->phys = "wmi/input0";
 211         msi_wmi_input_dev->id.bustype = BUS_HOST;
 212
 213         err = sparse_keymap_setup(msi_wmi_input_dev, msi_wmi_keymap, NULL);
 214         if (err)
 215                 goto err_free_dev;
 216
 217         err = input_register_device(msi_wmi_input_dev);
 218
 219         if (err)
 220                 goto err_free_keymap;
 221
 222         memset(last_pressed, 0, sizeof(last_pressed));
 223
 224         return 0;
 225
 226 err_free_keymap:
 227         sparse_keymap_free(msi_wmi_input_dev);
 228 err_free_dev:
 229         input_free_device(msi_wmi_input_dev);
 230         return err;
 231 }
 232
 233 static int __init msi_wmi_init(void)
 234 {
 235         int err;
 236
 237         if (!wmi_has_guid(MSIWMI_EVENT_GUID)) {
 238                 pr_err("This machine doesn't have MSI-hotkeys through WMI\n");
 239                 return -ENODEV;
 240         }
 241         err = wmi_install_notify_handler(MSIWMI_EVENT_GUID,
 242                         msi_wmi_notify, NULL);
 243         if (ACPI_FAILURE(err))
 244                 return -EINVAL;
 245
 246         err = msi_wmi_input_setup();
 247         if (err)
 248                 goto err_uninstall_notifier;
 249
 250         if (!acpi_video_backlight_support()) {
 251                 struct backlight_properties props;
 252                 memset(&props, 0, sizeof(struct backlight_properties));
 253                 props.type = BACKLIGHT_PLATFORM;
 254                 props.max_brightness = ARRAY_SIZE(backlight_map) - 1;
 255                 backlight = backlight_device_register(DRV_NAME, NULL, NULL,
 256                                                       &msi_backlight_ops,
 257                                                       &props);
 258                 if (IS_ERR(backlight)) {
 259                         err = PTR_ERR(backlight);
 260                         goto err_free_input;
 261                 }
 262
 263                 err = bl_get(NULL);
 264                 if (err < 0)
 265                         goto err_free_backlight;
 266
 267                 backlight->props.brightness = err;
 268         }
 269         pr_debug("Event handler installed\n");
 270
 271         return 0;
 272
 273 err_free_backlight:
 274         backlight_device_unregister(backlight);
 275 err_free_input:
 276         sparse_keymap_free(msi_wmi_input_dev);
 277         input_unregister_device(msi_wmi_input_dev);
 278 err_uninstall_notifier:
 279         wmi_remove_notify_handler(MSIWMI_EVENT_GUID);
 280         return err;
 281 }
 282
 283 static void __exit msi_wmi_exit(void)
 284 {
 285         if (wmi_has_guid(MSIWMI_EVENT_GUID)) {
 286                 wmi_remove_notify_handler(MSIWMI_EVENT_GUID);
 287                 sparse_keymap_free(msi_wmi_input_dev);
 288                 input_unregister_device(msi_wmi_input_dev);
 289                 backlight_device_unregister(backlight);
 290         }
 291 }
 292
 293 module_init(msi_wmi_init);
 294 module_exit(msi_wmi_exit);