dell-wmi: new driver for hotkey control
Add a WMI driver for Dell laptops. Currently it does nothing but send a
generic input event when a button with a picture of a battery on it is
pressed, but maybe other uses will appear over time.
Signed-off-by: Matthew Garrett <mjg@redhat.com>
Cc: Dmitry Torokhov <dtor@mail.ru>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Len Brown <len.brown@intel.com>
diff --git a/drivers/platform/x86/Kconfig b/drivers/platform/x86/Kconfig
index 3608081..a27bff3 100644
--- a/drivers/platform/x86/Kconfig
+++ b/drivers/platform/x86/Kconfig
@@ -67,6 +67,16 @@
This driver adds support for rfkill and backlight control to Dell
laptops.
+config DELL_WMI
+ tristate "Dell WMI extras"
+ depends on ACPI_WMI
+ depends on INPUT
+ ---help---
+ Say Y here if you want to support WMI-based hotkeys on Dell laptops.
+
+ To compile this driver as a module, choose M here: the module will
+ be called dell-wmi.
+
config FUJITSU_LAPTOP
tristate "Fujitsu Laptop Extras"
depends on ACPI
diff --git a/drivers/platform/x86/Makefile b/drivers/platform/x86/Makefile
index e290651..e40c7bd 100644
--- a/drivers/platform/x86/Makefile
+++ b/drivers/platform/x86/Makefile
@@ -7,6 +7,7 @@
obj-$(CONFIG_MSI_LAPTOP) += msi-laptop.o
obj-$(CONFIG_COMPAL_LAPTOP) += compal-laptop.o
obj-$(CONFIG_DELL_LAPTOP) += dell-laptop.o
+obj-$(CONFIG_DELL_WMI) += dell-wmi.o
obj-$(CONFIG_ACER_WMI) += acer-wmi.o
obj-$(CONFIG_HP_WMI) += hp-wmi.o
obj-$(CONFIG_TC1100_WMI) += tc1100-wmi.o
diff --git a/drivers/platform/x86/dell-wmi.c b/drivers/platform/x86/dell-wmi.c
new file mode 100644
index 0000000..2fab941
--- /dev/null
+++ b/drivers/platform/x86/dell-wmi.c
@@ -0,0 +1,210 @@
+/*
+ * Dell WMI hotkeys
+ *
+ * Copyright (C) 2008 Red Hat <mjg@redhat.com>
+ *
+ * Portions based on wistron_btns.c:
+ * Copyright (C) 2005 Miloslav Trmac <mitr@volny.cz>
+ * Copyright (C) 2005 Bernhard Rosenkraenzer <bero@arklinux.org>
+ * Copyright (C) 2005 Dmitry Torokhov <dtor@mail.ru>
+ *
+ * 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/module.h>
+#include <linux/init.h>
+#include <linux/types.h>
+#include <linux/input.h>
+#include <acpi/acpi_drivers.h>
+#include <linux/acpi.h>
+#include <linux/string.h>
+
+MODULE_AUTHOR("Matthew Garrett <mjg@redhat.com>");
+MODULE_DESCRIPTION("Dell laptop WMI hotkeys driver");
+MODULE_LICENSE("GPL");
+
+#define DELL_EVENT_GUID "9DBB5994-A997-11DA-B012-B622A1EF5492"
+
+MODULE_ALIAS("wmi:"DELL_EVENT_GUID);
+
+struct key_entry {
+ char type; /* See KE_* below */
+ u16 code;
+ u16 keycode;
+};
+
+enum { KE_KEY, KE_SW, KE_END };
+
+static struct key_entry dell_wmi_keymap[] = {
+ {KE_KEY, 0xe045, KEY_PROG1},
+ {KE_END, 0}
+};
+
+static struct input_dev *dell_wmi_input_dev;
+
+static struct key_entry *dell_wmi_get_entry_by_scancode(int code)
+{
+ struct key_entry *key;
+
+ for (key = dell_wmi_keymap; key->type != KE_END; key++)
+ if (code == key->code)
+ return key;
+
+ return NULL;
+}
+
+static struct key_entry *dell_wmi_get_entry_by_keycode(int keycode)
+{
+ struct key_entry *key;
+
+ for (key = dell_wmi_keymap; key->type != KE_END; key++)
+ if (key->type == KE_KEY && keycode == key->keycode)
+ return key;
+
+ return NULL;
+}
+
+static int dell_wmi_getkeycode(struct input_dev *dev, int scancode,
+ int *keycode)
+{
+ struct key_entry *key = dell_wmi_get_entry_by_scancode(scancode);
+
+ if (key && key->type == KE_KEY) {
+ *keycode = key->keycode;
+ return 0;
+ }
+
+ return -EINVAL;
+}
+
+static int dell_wmi_setkeycode(struct input_dev *dev, int scancode, int keycode)
+{
+ struct key_entry *key;
+ int old_keycode;
+
+ if (keycode < 0 || keycode > KEY_MAX)
+ return -EINVAL;
+
+ key = dell_wmi_get_entry_by_scancode(scancode);
+ if (key && key->type == KE_KEY) {
+ old_keycode = key->keycode;
+ key->keycode = keycode;
+ set_bit(keycode, dev->keybit);
+ if (!dell_wmi_get_entry_by_keycode(old_keycode))
+ clear_bit(old_keycode, dev->keybit);
+ return 0;
+ }
+ return -EINVAL;
+}
+
+static void dell_wmi_notify(u32 value, void *context)
+{
+ struct acpi_buffer response = { ACPI_ALLOCATE_BUFFER, NULL };
+ static struct key_entry *key;
+ union acpi_object *obj;
+
+ wmi_get_event_data(value, &response);
+
+ obj = (union acpi_object *)response.pointer;
+
+ if (obj && obj->type == ACPI_TYPE_BUFFER) {
+ int *buffer = (int *)obj->buffer.pointer;
+ key = dell_wmi_get_entry_by_scancode(buffer[1]);
+ if (key) {
+ input_report_key(dell_wmi_input_dev, key->keycode, 1);
+ input_sync(dell_wmi_input_dev);
+ input_report_key(dell_wmi_input_dev, key->keycode, 0);
+ input_sync(dell_wmi_input_dev);
+ } else
+ printk(KERN_INFO "dell-wmi: Unknown key %x pressed\n",
+ buffer[1]);
+ }
+}
+
+static int __init dell_wmi_input_setup(void)
+{
+ struct key_entry *key;
+ int err;
+
+ dell_wmi_input_dev = input_allocate_device();
+
+ if (!dell_wmi_input_dev)
+ return -ENOMEM;
+
+ dell_wmi_input_dev->name = "Dell WMI hotkeys";
+ dell_wmi_input_dev->phys = "wmi/input0";
+ dell_wmi_input_dev->id.bustype = BUS_HOST;
+ dell_wmi_input_dev->getkeycode = dell_wmi_getkeycode;
+ dell_wmi_input_dev->setkeycode = dell_wmi_setkeycode;
+
+ for (key = dell_wmi_keymap; key->type != KE_END; key++) {
+ switch (key->type) {
+ case KE_KEY:
+ set_bit(EV_KEY, dell_wmi_input_dev->evbit);
+ set_bit(key->keycode, dell_wmi_input_dev->keybit);
+ break;
+ case KE_SW:
+ set_bit(EV_SW, dell_wmi_input_dev->evbit);
+ set_bit(key->keycode, dell_wmi_input_dev->swbit);
+ break;
+ }
+ }
+
+ err = input_register_device(dell_wmi_input_dev);
+
+ if (err) {
+ input_free_device(dell_wmi_input_dev);
+ return err;
+ }
+
+ return 0;
+}
+
+static int __init dell_wmi_init(void)
+{
+ int err;
+
+ if (wmi_has_guid(DELL_EVENT_GUID)) {
+ err = dell_wmi_input_setup();
+
+ if (err)
+ return err;
+
+ err = wmi_install_notify_handler(DELL_EVENT_GUID,
+ dell_wmi_notify, NULL);
+ if (err) {
+ input_unregister_device(dell_wmi_input_dev);
+ printk(KERN_ERR "dell-wmi: Unable to register"
+ " notify handler - %d\n", err);
+ return err;
+ }
+
+ } else
+ printk(KERN_WARNING "dell-wmi: No known WMI GUID found\n");
+
+ return 0;
+}
+
+static void __exit dell_wmi_exit(void)
+{
+ if (wmi_has_guid(DELL_EVENT_GUID)) {
+ wmi_remove_notify_handler(DELL_EVENT_GUID);
+ input_unregister_device(dell_wmi_input_dev);
+ }
+}
+
+module_init(dell_wmi_init);
+module_exit(dell_wmi_exit);