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