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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
  24 #include <linux/kernel.h>
  25 #include <linux/input.h>
  26 #include <linux/input/sparse-keymap.h>
  27 #include <linux/acpi.h>
  28 #include <linux/backlight.h>
  29
  30 MODULE_AUTHOR("Thomas Renninger <trenn@suse.de>");
  31 MODULE_DESCRIPTION("MSI laptop WMI hotkeys driver");
  32 MODULE_LICENSE("GPL");
  33
  34 MODULE_ALIAS("wmi:551A1F84-FBDD-4125-91DB-3EA8F44F1D45");
  35 MODULE_ALIAS("wmi:B6F3EEF2-3D2F-49DC-9DE3-85BCE18C62F2");
  36
  37 /* Temporary workaround until the WMI sysfs interface goes in
  38                 { "svn", DMI_SYS_VENDOR },
  39                 { "pn",  DMI_PRODUCT_NAME },
  40                 { "pvr", DMI_PRODUCT_VERSION },
  41                 { "rvn", DMI_BOARD_VENDOR },
  42                 { "rn",  DMI_BOARD_NAME },
  43 */
  44
  45 MODULE_ALIAS("dmi:*:svnMICRO-STARINTERNATIONAL*:pnMS-6638:*");
  46
  47 #define DRV_NAME "msi-wmi"
  48 #define DRV_PFX DRV_NAME ": "
  49
  50 #define MSIWMI_BIOS_GUID "551A1F84-FBDD-4125-91DB-3EA8F44F1D45"
  51 #define MSIWMI_EVENT_GUID "B6F3EEF2-3D2F-49DC-9DE3-85BCE18C62F2"
  52
  53 #define dprintk(msg...) pr_debug(DRV_PFX msg)
  54
  55 #define KEYCODE_BASE 0xD0
  56 static struct key_entry msi_wmi_keymap[] = {
  57         { KE_KEY, KEYCODE_BASE,     {KEY_BRIGHTNESSUP} },
  58         { KE_KEY, KEYCODE_BASE + 1, {KEY_BRIGHTNESSDOWN} },
  59         { KE_KEY, KEYCODE_BASE + 2, {KEY_VOLUMEUP} },
  60         { KE_KEY, KEYCODE_BASE + 3, {KEY_VOLUMEDOWN} },
  61         { KE_END, 0}
  62 };
  63 static ktime_t last_pressed[ARRAY_SIZE(msi_wmi_keymap) - 1];
  64
  65 struct backlight_device *backlight;
  66
  67 static int backlight_map[] = { 0x00, 0x33, 0x66, 0x99, 0xCC, 0xFF };
  68
  69 static struct input_dev *msi_wmi_input_dev;
  70
  71 static int msi_wmi_query_block(int instance, int *ret)
  72 {
  73         acpi_status status;
  74         union acpi_object *obj;
  75
  76         struct acpi_buffer output = { ACPI_ALLOCATE_BUFFER, NULL };
  77
  78         status = wmi_query_block(MSIWMI_BIOS_GUID, instance, &output);
  79
  80         obj = output.pointer;
  81
  82         if (!obj || obj->type != ACPI_TYPE_INTEGER) {
  83                 if (obj) {
  84                         printk(KERN_ERR DRV_PFX "query block returned object "
  85                                "type: %d - buffer length:%d\n", obj->type,
  86                                obj->type == ACPI_TYPE_BUFFER ?
  87                                obj->buffer.length : 0);
  88                 }
  89                 kfree(obj);
  90                 return -EINVAL;
  91         }
  92         *ret = obj->integer.value;
  93         kfree(obj);
  94         return 0;
  95 }
  96
  97 static int msi_wmi_set_block(int instance, int value)
  98 {
  99         acpi_status status;
 100
 101         struct acpi_buffer input = { sizeof(int), &value };
 102
 103         dprintk("Going to set block of instance: %d - value: %d\n",
 104                 instance, value);
 105
 106         status = wmi_set_block(MSIWMI_BIOS_GUID, instance, &input);
 107
 108         return ACPI_SUCCESS(status) ? 0 : 1;
 109 }
 110
 111 static int bl_get(struct backlight_device *bd)
 112 {
 113         int level, err, ret = 0;
 114
 115         /* Instance 1 is "get backlight", cmp with DSDT */
 116         err = msi_wmi_query_block(1, &ret);
 117         if (err)
 118                 printk(KERN_ERR DRV_PFX "Could not query backlight: %d\n", err);
 119         dprintk("Get: Query block returned: %d\n", ret);
 120         for (level = 0; level < ARRAY_SIZE(backlight_map); level++) {
 121                 if (backlight_map[level] == ret) {
 122                         dprintk("Current backlight level: 0x%X - index: %d\n",
 123                                 backlight_map[level], level);
 124                         break;
 125                 }
 126         }
 127         if (level == ARRAY_SIZE(backlight_map)) {
 128                 printk(KERN_ERR DRV_PFX "get: Invalid brightness value: 0x%X\n",
 129                        ret);
 130                 return -EINVAL;
 131         }
 132         return level;
 133 }
 134
 135 static int bl_set_status(struct backlight_device *bd)
 136 {
 137         int bright = bd->props.brightness;
 138         if (bright >= ARRAY_SIZE(backlight_map) || bright < 0)
 139                 return -EINVAL;
 140
 141         /* Instance 0 is "set backlight" */
 142         return msi_wmi_set_block(0, backlight_map[bright]);
 143 }
 144
 145 static struct backlight_ops msi_backlight_ops = {
 146         .get_brightness = bl_get,
 147         .update_status  = bl_set_status,
 148 };
 149
 150 static void msi_wmi_notify(u32 value, void *context)
 151 {
 152         struct acpi_buffer response = { ACPI_ALLOCATE_BUFFER, NULL };
 153         static struct key_entry *key;
 154         union acpi_object *obj;
 155         ktime_t cur;
 156
 157         wmi_get_event_data(value, &response);
 158
 159         obj = (union acpi_object *)response.pointer;
 160
 161         if (obj && obj->type == ACPI_TYPE_INTEGER) {
 162                 int eventcode = obj->integer.value;
 163                 dprintk("Eventcode: 0x%x\n", eventcode);
 164                 key = sparse_keymap_entry_from_scancode(msi_wmi_input_dev,
 165                                 eventcode);
 166                 if (key) {
 167                         ktime_t diff;
 168                         cur = ktime_get_real();
 169                         diff = ktime_sub(cur, last_pressed[key->code -
 170                                         KEYCODE_BASE]);
 171                         /* Ignore event if the same event happened in a 50 ms
 172                            timeframe -> Key press may result in 10-20 GPEs */
 173                         if (ktime_to_us(diff) < 1000 * 50) {
 174                                 dprintk("Suppressed key event 0x%X - "
 175                                         "Last press was %lld us ago\n",
 176                                          key->code, ktime_to_us(diff));
 177                                 return;
 178                         }
 179                         last_pressed[key->code - KEYCODE_BASE] = cur;
 180
 181                         if (key->type == KE_KEY &&
 182                         /* Brightness is served via acpi video driver */
 183                         (backlight || (key->keycode != KEY_BRIGHTNESSUP &&
 184                         key->keycode != KEY_BRIGHTNESSDOWN))) {
 185                                 dprintk("Send key: 0x%X - "
 186                                         "Input layer keycode: %d\n", key->code,
 187                                          key->keycode);
 188                                 sparse_keymap_report_entry(msi_wmi_input_dev,
 189                                                 key, 1, true);
 190                         }
 191                 } else
 192                         printk(KERN_INFO "Unknown key pressed - %x\n",
 193                                eventcode);
 194         } else
 195                 printk(KERN_INFO DRV_PFX "Unknown event received\n");
 196         kfree(response.pointer);
 197 }
 198
 199 static int __init msi_wmi_input_setup(void)
 200 {
 201         int err;
 202
 203         msi_wmi_input_dev = input_allocate_device();
 204         if (!msi_wmi_input_dev)
 205                 return -ENOMEM;
 206
 207         msi_wmi_input_dev->name = "MSI WMI hotkeys";
 208         msi_wmi_input_dev->phys = "wmi/input0";
 209         msi_wmi_input_dev->id.bustype = BUS_HOST;
 210
 211         err = sparse_keymap_setup(msi_wmi_input_dev, msi_wmi_keymap, NULL);
 212         if (err)
 213                 goto err_free_dev;
 214
 215         err = input_register_device(msi_wmi_input_dev);
 216
 217         if (err)
 218                 goto err_free_keymap;
 219
 220         memset(last_pressed, 0, sizeof(last_pressed));
 221
 222         return 0;
 223
 224 err_free_keymap:
 225         sparse_keymap_free(msi_wmi_input_dev);
 226 err_free_dev:
 227         input_free_device(msi_wmi_input_dev);
 228         return err;
 229 }
 230
 231 static int __init msi_wmi_init(void)
 232 {
 233         int err;
 234
 235         if (!wmi_has_guid(MSIWMI_EVENT_GUID)) {
 236                 printk(KERN_ERR
 237                        "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 (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                 backlight = backlight_device_register(DRV_NAME,
 251                                 NULL, NULL, &msi_backlight_ops);
 252                 if (IS_ERR(backlight))
 253                         goto err_free_input;
 254
 255                 backlight->props.max_brightness = ARRAY_SIZE(backlight_map) - 1;
 256                 err = bl_get(NULL);
 257                 if (err < 0)
 258                         goto err_free_backlight;
 259
 260                 backlight->props.brightness = err;
 261         }
 262         dprintk("Event handler installed\n");
 263
 264         return 0;
 265
 266 err_free_backlight:
 267         backlight_device_unregister(backlight);
 268 err_free_input:
 269         input_unregister_device(msi_wmi_input_dev);
 270 err_uninstall_notifier:
 271         wmi_remove_notify_handler(MSIWMI_EVENT_GUID);
 272         return err;
 273 }
 274
 275 static void __exit msi_wmi_exit(void)
 276 {
 277         if (wmi_has_guid(MSIWMI_EVENT_GUID)) {
 278                 wmi_remove_notify_handler(MSIWMI_EVENT_GUID);
 279                 sparse_keymap_free(msi_wmi_input_dev);
 280                 input_unregister_device(msi_wmi_input_dev);
 281                 backlight_device_unregister(backlight);
 282         }
 283 }
 284
 285 module_init(msi_wmi_init);
 286 module_exit(msi_wmi_exit);