1 files changed, 288 insertions, 0 deletions

diff --git a/drivers/platform/x86/msi-wmi.c b/drivers/platform/x86/msi-wmi.c
new file mode 100644
index 000000000000..f5f70d4c6913
--- /dev/null
+++ b/drivers/platform/x86/msi-wmi.c
@@ -0,0 +1,288 @@
+/*
+ * MSI WMI hotkeys
+ *
+ * Copyright (C) 2009 Novell <trenn@suse.de>
+ *
+ * Most stuff taken over from hp-wmi
+ *
+ *  This program is free software; you can redistribute it and/or modify
+ *  it under the terms of the GNU General Public License as published by
+ *  the Free Software Foundation; either version 2 of the License, or
+ *  (at your option) any later version.
+ *
+ *  This program is distributed in the hope that it will be useful,
+ *  but WITHOUT ANY WARRANTY; without even the implied warranty of
+ *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ *  GNU General Public License for more details.
+ *
+ *  You should have received a copy of the GNU General Public License
+ *  along with this program; if not, write to the Free Software
+ *  Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
+ */
+
+
+#include <linux/kernel.h>
+#include <linux/input.h>
+#include <linux/input/sparse-keymap.h>
+#include <linux/acpi.h>
+#include <linux/backlight.h>
+
+MODULE_AUTHOR("Thomas Renninger <trenn@suse.de>");
+MODULE_DESCRIPTION("MSI laptop WMI hotkeys driver");
+MODULE_LICENSE("GPL");
+
+MODULE_ALIAS("wmi:551A1F84-FBDD-4125-91DB-3EA8F44F1D45");
+MODULE_ALIAS("wmi:B6F3EEF2-3D2F-49DC-9DE3-85BCE18C62F2");
+
+#define DRV_NAME "msi-wmi"
+#define DRV_PFX DRV_NAME ": "
+
+#define MSIWMI_BIOS_GUID "551A1F84-FBDD-4125-91DB-3EA8F44F1D45"
+#define MSIWMI_EVENT_GUID "B6F3EEF2-3D2F-49DC-9DE3-85BCE18C62F2"
+
+#define dprintk(msg...) pr_debug(DRV_PFX msg)
+
+#define KEYCODE_BASE 0xD0
+#define MSI_WMI_BRIGHTNESSUP   KEYCODE_BASE
+#define MSI_WMI_BRIGHTNESSDOWN (KEYCODE_BASE + 1)
+#define MSI_WMI_VOLUMEUP       (KEYCODE_BASE + 2)
+#define MSI_WMI_VOLUMEDOWN     (KEYCODE_BASE + 3)
+static struct key_entry msi_wmi_keymap[] = {
+        { KE_KEY, MSI_WMI_BRIGHTNESSUP,   {KEY_BRIGHTNESSUP} },
+        { KE_KEY, MSI_WMI_BRIGHTNESSDOWN, {KEY_BRIGHTNESSDOWN} },
+        { KE_KEY, MSI_WMI_VOLUMEUP,       {KEY_VOLUMEUP} },
+        { KE_KEY, MSI_WMI_VOLUMEDOWN,     {KEY_VOLUMEDOWN} },
+        { KE_END, 0}
+};
+static ktime_t last_pressed[ARRAY_SIZE(msi_wmi_keymap) - 1];
+
+struct backlight_device *backlight;
+
+static int backlight_map[] = { 0x00, 0x33, 0x66, 0x99, 0xCC, 0xFF };
+
+static struct input_dev *msi_wmi_input_dev;
+
+static int msi_wmi_query_block(int instance, int *ret)
+{
+        acpi_status status;
+        union acpi_object *obj;
+
+        struct acpi_buffer output = { ACPI_ALLOCATE_BUFFER, NULL };
+
+        status = wmi_query_block(MSIWMI_BIOS_GUID, instance, &output);
+
+        obj = output.pointer;
+
+        if (!obj || obj->type != ACPI_TYPE_INTEGER) {
+                if (obj) {
+                        printk(KERN_ERR DRV_PFX "query block returned object "
+                               "type: %d - buffer length:%d\n", obj->type,
+                               obj->type == ACPI_TYPE_BUFFER ?
+                               obj->buffer.length : 0);
+                }
+                kfree(obj);
+                return -EINVAL;
+        }
+        *ret = obj->integer.value;
+        kfree(obj);
+        return 0;
+}
+
+static int msi_wmi_set_block(int instance, int value)
+{
+        acpi_status status;
+
+        struct acpi_buffer input = { sizeof(int), &value };
+
+        dprintk("Going to set block of instance: %d - value: %d\n",
+                instance, value);
+
+        status = wmi_set_block(MSIWMI_BIOS_GUID, instance, &input);
+
+        return ACPI_SUCCESS(status) ? 0 : 1;
+}
+
+static int bl_get(struct backlight_device *bd)
+{
+        int level, err, ret;
+
+        /* Instance 1 is "get backlight", cmp with DSDT */
+        err = msi_wmi_query_block(1, &ret);
+        if (err) {
+                printk(KERN_ERR DRV_PFX "Could not query backlight: %d\n", err);
+                return -EINVAL;
+        }
+        dprintk("Get: Query block returned: %d\n", ret);
+        for (level = 0; level < ARRAY_SIZE(backlight_map); level++) {
+                if (backlight_map[level] == ret) {
+                        dprintk("Current backlight level: 0x%X - index: %d\n",
+                                backlight_map[level], level);
+                        break;
+                }
+        }
+        if (level == ARRAY_SIZE(backlight_map)) {
+                printk(KERN_ERR DRV_PFX "get: Invalid brightness value: 0x%X\n",
+                       ret);
+                return -EINVAL;
+        }
+        return level;
+}
+
+static int bl_set_status(struct backlight_device *bd)
+{
+        int bright = bd->props.brightness;
+        if (bright >= ARRAY_SIZE(backlight_map) || bright < 0)
+                return -EINVAL;
+
+        /* Instance 0 is "set backlight" */
+        return msi_wmi_set_block(0, backlight_map[bright]);
+}
+
+static struct backlight_ops msi_backlight_ops = {
+        .get_brightness = bl_get,
+        .update_status  = bl_set_status,
+};
+
+static void msi_wmi_notify(u32 value, void *context)
+{
+        struct acpi_buffer response = { ACPI_ALLOCATE_BUFFER, NULL };
+        static struct key_entry *key;
+        union acpi_object *obj;
+        ktime_t cur;
+        acpi_status status;
+
+        status = wmi_get_event_data(value, &response);
+        if (status != AE_OK) {
+                printk(KERN_INFO DRV_PFX "bad event status 0x%x\n", status);
+                return;
+        }
+
+        obj = (union acpi_object *)response.pointer;
+
+        if (obj && obj->type == ACPI_TYPE_INTEGER) {
+                int eventcode = obj->integer.value;
+                dprintk("Eventcode: 0x%x\n", eventcode);
+                key = sparse_keymap_entry_from_scancode(msi_wmi_input_dev,
+                                eventcode);
+                if (key) {
+                        ktime_t diff;
+                        cur = ktime_get_real();
+                        diff = ktime_sub(cur, last_pressed[key->code -
+                                        KEYCODE_BASE]);
+                        /* Ignore event if the same event happened in a 50 ms
+                           timeframe -> Key press may result in 10-20 GPEs */
+                        if (ktime_to_us(diff) < 1000 * 50) {
+                                dprintk("Suppressed key event 0x%X - "
+                                        "Last press was %lld us ago\n",
+                                         key->code, ktime_to_us(diff));
+                                return;
+                        }
+                        last_pressed[key->code - KEYCODE_BASE] = cur;
+
+                        if (key->type == KE_KEY &&
+                        /* Brightness is served via acpi video driver */
+                        (!acpi_video_backlight_support() ||
+                        (key->code != MSI_WMI_BRIGHTNESSUP &&
+                        key->code != MSI_WMI_BRIGHTNESSDOWN))) {
+                                dprintk("Send key: 0x%X - "
+                                        "Input layer keycode: %d\n", key->code,
+                                         key->keycode);
+                                sparse_keymap_report_entry(msi_wmi_input_dev,
+                                                key, 1, true);
+                        }
+                } else
+                        printk(KERN_INFO "Unknown key pressed - %x\n",
+                               eventcode);
+        } else
+                printk(KERN_INFO DRV_PFX "Unknown event received\n");
+        kfree(response.pointer);
+}
+
+static int __init msi_wmi_input_setup(void)
+{
+        int err;
+
+        msi_wmi_input_dev = input_allocate_device();
+        if (!msi_wmi_input_dev)
+                return -ENOMEM;
+
+        msi_wmi_input_dev->name = "MSI WMI hotkeys";
+        msi_wmi_input_dev->phys = "wmi/input0";
+        msi_wmi_input_dev->id.bustype = BUS_HOST;
+
+        err = sparse_keymap_setup(msi_wmi_input_dev, msi_wmi_keymap, NULL);
+        if (err)
+                goto err_free_dev;
+
+        err = input_register_device(msi_wmi_input_dev);
+
+        if (err)
+                goto err_free_keymap;
+
+        memset(last_pressed, 0, sizeof(last_pressed));
+
+        return 0;
+
+err_free_keymap:
+        sparse_keymap_free(msi_wmi_input_dev);
+err_free_dev:
+        input_free_device(msi_wmi_input_dev);
+        return err;
+}
+
+static int __init msi_wmi_init(void)
+{
+        int err;
+
+        if (!wmi_has_guid(MSIWMI_EVENT_GUID)) {
+                printk(KERN_ERR
+                       "This machine doesn't have MSI-hotkeys through WMI\n");
+                return -ENODEV;
+        }
+        err = wmi_install_notify_handler(MSIWMI_EVENT_GUID,
+                        msi_wmi_notify, NULL);
+        if (ACPI_FAILURE(err))
+                return -EINVAL;
+
+        err = msi_wmi_input_setup();
+        if (err)
+                goto err_uninstall_notifier;
+
+        if (!acpi_video_backlight_support()) {
+                backlight = backlight_device_register(DRV_NAME,
+                                NULL, NULL, &msi_backlight_ops);
+                if (IS_ERR(backlight))
+                        goto err_free_input;
+
+                backlight->props.max_brightness = ARRAY_SIZE(backlight_map) - 1;
+                err = bl_get(NULL);
+                if (err < 0)
+                        goto err_free_backlight;
+
+                backlight->props.brightness = err;
+        }
+        dprintk("Event handler installed\n");
+
+        return 0;
+
+err_free_backlight:
+        backlight_device_unregister(backlight);
+err_free_input:
+        input_unregister_device(msi_wmi_input_dev);
+err_uninstall_notifier:
+        wmi_remove_notify_handler(MSIWMI_EVENT_GUID);
+        return err;
+}
+
+static void __exit msi_wmi_exit(void)
+{
+        if (wmi_has_guid(MSIWMI_EVENT_GUID)) {
+                wmi_remove_notify_handler(MSIWMI_EVENT_GUID);
+                sparse_keymap_free(msi_wmi_input_dev);
+                input_unregister_device(msi_wmi_input_dev);
+                backlight_device_unregister(backlight);
+        }
+}
+
+module_init(msi_wmi_init);
+module_exit(msi_wmi_exit);