Changes since v3:
1. Call sparse_keymap_free before input_unregister_device
Changes since v2:
1. Define keymap as const
2. Check the return value of wmi_get_event_data
3. Mark brightness key events as KE_IGNORE
4. Replace printk with pr_ family functions
5. Add some missing calls to sparse_keymap_free
Changes since v1:
1. Use sparse keymap
2. Not send brightness input events
3. Fix memory leak of acpi_object
4. Set up input device before registering wmi notifier
5. Not return success if GUID is not found
6. Not check guid here in wmi_exit
---
Add a WMI driver for Eee PC laptops. Currently it only supports hotkeys.
Signed-off-by: Yong Wang <yong.y.wang@xxxxxxxxx>
---
drivers/platform/x86/Kconfig | 10 +++
drivers/platform/x86/Makefile | 1
drivers/platform/x86/eeepc-wmi.c | 157
++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
3 files changed, 168 insertions(+)
diff --git a/drivers/platform/x86/Kconfig b/drivers/platform/x86/Kconfig
index e631dbe..7bec458 100644
--- a/drivers/platform/x86/Kconfig
+++ b/drivers/platform/x86/Kconfig
@@ -385,6 +385,16 @@ config EEEPC_LAPTOP
If you have an Eee PC laptop, say Y or M here.
+config EEEPC_WMI
+ tristate "Eee PC WMI Hotkey Driver (EXPERIMENTAL)"
+ depends on ACPI_WMI
+ depends on INPUT
+ depends on EXPERIMENTAL
+ ---help---
+ Say Y here if you want to support WMI-based hotkeys on Eee PC laptops.
+
+ To compile this driver as a module, choose M here: the module will
+ be called eeepc-wmi.
config ACPI_WMI
tristate "WMI"
diff --git a/drivers/platform/x86/Makefile b/drivers/platform/x86/Makefile
index 9cd9fa0..a906490 100644
--- a/drivers/platform/x86/Makefile
+++ b/drivers/platform/x86/Makefile
@@ -4,6 +4,7 @@
#
obj-$(CONFIG_ASUS_LAPTOP) += asus-laptop.o
obj-$(CONFIG_EEEPC_LAPTOP) += eeepc-laptop.o
+obj-$(CONFIG_EEEPC_WMI) += eeepc-wmi.o
obj-$(CONFIG_MSI_LAPTOP) += msi-laptop.o
obj-$(CONFIG_ACPI_CMPC) += classmate-laptop.o
obj-$(CONFIG_COMPAL_LAPTOP) += compal-laptop.o
diff --git a/drivers/platform/x86/eeepc-wmi.c b/drivers/platform/x86/eeepc-wmi.c
new file mode 100644
index 0000000..2466b7b
--- /dev/null
+++ b/drivers/platform/x86/eeepc-wmi.c
@@ -0,0 +1,157 @@
+/*
+ * Eee PC WMI hotkey driver
+ *
+ * Copyright(C) 2010 Intel Corporation.
+ *
+ * Portions based on wistron_btns.c:
+ * Copyright (C) 2005 Miloslav Trmac <mitr@xxxxxxxx>
+ * Copyright (C) 2005 Bernhard Rosenkraenzer <bero@xxxxxxxxxxxx>
+ * Copyright (C) 2005 Dmitry Torokhov <dtor@xxxxxxx>
+ *
+ * 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 <linux/input/sparse-keymap.h>
+#include <acpi/acpi_bus.h>
+#include <acpi/acpi_drivers.h>
+
+MODULE_AUTHOR("Yong Wang <yong.y.wang@xxxxxxxxx>");
+MODULE_DESCRIPTION("Eee PC WMI Hotkey Driver");
+MODULE_LICENSE("GPL");
+
+#define EEEPC_WMI_EVENT_GUID "ABBC0F72-8EA1-11D1-00A0-C90629100000"
+
+MODULE_ALIAS("wmi:"EEEPC_WMI_EVENT_GUID);
+
+#define NOTIFY_BRNUP_MIN 0x11
+#define NOTIFY_BRNUP_MAX 0x1f
+#define NOTIFY_BRNDOWN_MIN 0x20
+#define NOTIFY_BRNDOWN_MAX 0x2e
+
+static const struct key_entry eeepc_wmi_keymap[] = {
+ /* Sleep already handled via generic ACPI code */
+ { KE_KEY, 0x5d, { KEY_WLAN } },
+ { KE_KEY, 0x32, { KEY_MUTE } },
+ { KE_KEY, 0x31, { KEY_VOLUMEDOWN } },
+ { KE_KEY, 0x30, { KEY_VOLUMEUP } },
+ { KE_IGNORE, NOTIFY_BRNDOWN_MIN, { KEY_BRIGHTNESSDOWN } },
+ { KE_IGNORE, NOTIFY_BRNUP_MIN, { KEY_BRIGHTNESSUP } },
+ { KE_KEY, 0xcc, { KEY_SWITCHVIDEOMODE } },
+ { KE_END, 0},
+};
+
+static struct input_dev *eeepc_wmi_input_dev;
+
+static void eeepc_wmi_notify(u32 value, void *context)
+{
+ struct acpi_buffer response = { ACPI_ALLOCATE_BUFFER, NULL };
+ union acpi_object *obj;
+ acpi_status status;
+ int code;
+
+ status = wmi_get_event_data(value, &response);
+ if (status != AE_OK) {
+ pr_err("EEEPC WMI: bad event status 0x%x\n", status);
+ return;
+ }
+
+ obj = (union acpi_object *)response.pointer;
+
+ if (obj && obj->type == ACPI_TYPE_INTEGER) {
+ code = obj->integer.value;
+
+ if (code >= NOTIFY_BRNUP_MIN && code <= NOTIFY_BRNUP_MAX)
+ code = NOTIFY_BRNUP_MIN;
+ else if (code >= NOTIFY_BRNDOWN_MIN && code <= NOTIFY_BRNDOWN_MAX)
+ code = NOTIFY_BRNDOWN_MIN;
+
+ if (!sparse_keymap_report_event(eeepc_wmi_input_dev,
+ code, 1, true))
+ pr_info("EEEPC WMI: Unknown key %x pressed\n", code);
+ }
+
+ kfree(obj);
+}
+
+static int eeepc_wmi_input_setup(void)
+{
+ int err;
+
+ eeepc_wmi_input_dev = input_allocate_device();
+ if (!eeepc_wmi_input_dev)
+ return -ENOMEM;
+
+ eeepc_wmi_input_dev->name = "Eee PC WMI hotkeys";
+ eeepc_wmi_input_dev->phys = "wmi/input0";
+ eeepc_wmi_input_dev->id.bustype = BUS_HOST;
+
+ err = sparse_keymap_setup(eeepc_wmi_input_dev, eeepc_wmi_keymap, NULL);
+ if (err)
+ goto err_free_dev;
+
+ err = input_register_device(eeepc_wmi_input_dev);
+ if (err)
+ goto err_free_keymap;
+
+ return 0;
+
+err_free_keymap:
+ sparse_keymap_free(eeepc_wmi_input_dev);
+err_free_dev:
+ input_free_device(eeepc_wmi_input_dev);
+ return err;
+}
+
+static int __init eeepc_wmi_init(void)
+{
+ int err;
+ acpi_status status;
+
+ if (!wmi_has_guid(EEEPC_WMI_EVENT_GUID)) {
+ pr_warning("EEEPC WMI: No known WMI GUID found\n");
+ return -ENODEV;
+ }
+
+ err = eeepc_wmi_input_setup();
+ if (err)
+ return err;
+
+ status = wmi_install_notify_handler(EEEPC_WMI_EVENT_GUID,
+ eeepc_wmi_notify, NULL);
+ if (ACPI_FAILURE(status)) {
+ sparse_keymap_free(eeepc_wmi_input_dev);
+ input_unregister_device(eeepc_wmi_input_dev);
+ pr_err("EEEPC WMI: Unable to register notify handler - %d\n",
+ status);
+ return -ENODEV;
+ }
+
+ return 0;
+}
+
+static void __exit eeepc_wmi_exit(void)
+{
+ wmi_remove_notify_handler(EEEPC_WMI_EVENT_GUID);
+ sparse_keymap_free(eeepc_wmi_input_dev);
+ input_unregister_device(eeepc_wmi_input_dev);
+}
+
+module_init(eeepc_wmi_init);
+module_exit(eeepc_wmi_exit);
--
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