3 files changed, 507 insertions, 0 deletions

diff --git a/drivers/misc/Kconfig b/drivers/misc/Kconfig
index d5bc288b1b0d..1689c051f68f 100644
--- a/drivers/misc/Kconfig
+++ b/drivers/misc/Kconfig
@@ -212,6 +212,18 @@ config TC1100_WMI
           This is a driver for the WMI extensions (wireless and bluetooth power
           control) of the HP Compaq TC1100 tablet.
 
+config HP_WMI
+       tristate "HP WMI extras"
+       depends on ACPI_WMI
+       depends on INPUT
+       depends on RFKILL
+       help
+         Say Y here if you want to support WMI-based hotkeys on HP laptops and
+         to read data from WMI such as docking or ambient light sensor state.
+
+         To compile this driver as a module, choose M here: the module will
+         be called hp-wmi.
+
 config MSI_LAPTOP
         tristate "MSI Laptop Extras"
         depends on X86
diff --git a/drivers/misc/Makefile b/drivers/misc/Makefile
index 688fe76135e0..f5e273420c09 100644
--- a/drivers/misc/Makefile
+++ b/drivers/misc/Makefile
@@ -13,6 +13,7 @@ obj-$(CONFIG_ACER_WMI)		+= acer-wmi.o
 obj-$(CONFIG_ATMEL_PWM)         += atmel_pwm.o
 obj-$(CONFIG_ATMEL_SSC)         += atmel-ssc.o
 obj-$(CONFIG_ATMEL_TCLIB)       += atmel_tclib.o
+obj-$(CONFIG_HP_WMI)            += hp-wmi.o
 obj-$(CONFIG_TC1100_WMI)        += tc1100-wmi.o
 obj-$(CONFIG_LKDTM)             += lkdtm.o
 obj-$(CONFIG_TIFM_CORE)         += tifm_core.o
diff --git a/drivers/misc/hp-wmi.c b/drivers/misc/hp-wmi.c
new file mode 100644
index 000000000000..1dbcbcb323a2
--- /dev/null
+++ b/drivers/misc/hp-wmi.c
@@ -0,0 +1,494 @@
+/*
+ * HP 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/platform_device.h>
+#include <linux/acpi.h>
+#include <linux/rfkill.h>
+#include <linux/string.h>
+
+MODULE_AUTHOR("Matthew Garrett <mjg59@srcf.ucam.org>");
+MODULE_DESCRIPTION("HP laptop WMI hotkeys driver");
+MODULE_LICENSE("GPL");
+
+MODULE_ALIAS("wmi:95F24279-4D7B-4334-9387-ACCDC67EF61C");
+MODULE_ALIAS("wmi:5FB7F034-2C63-45e9-BE91-3D44E2C707E4");
+
+#define HPWMI_EVENT_GUID "95F24279-4D7B-4334-9387-ACCDC67EF61C"
+#define HPWMI_BIOS_GUID "5FB7F034-2C63-45e9-BE91-3D44E2C707E4"
+
+#define HPWMI_DISPLAY_QUERY 0x1
+#define HPWMI_HDDTEMP_QUERY 0x2
+#define HPWMI_ALS_QUERY 0x3
+#define HPWMI_DOCK_QUERY 0x4
+#define HPWMI_WIRELESS_QUERY 0x5
+
+static int __init hp_wmi_bios_setup(struct platform_device *device);
+static int __exit hp_wmi_bios_remove(struct platform_device *device);
+
+struct bios_args {
+        u32 signature;
+        u32 command;
+        u32 commandtype;
+        u32 datasize;
+        u32 data;
+};
+
+struct bios_return {
+        u32 sigpass;
+        u32 return_code;
+        u32 value;
+};
+
+struct key_entry {
+        char type;              /* See KE_* below */
+        u8 code;
+        u16 keycode;
+};
+
+enum { KE_KEY, KE_SW, KE_END };
+
+static struct key_entry hp_wmi_keymap[] = {
+        {KE_SW, 0x01, SW_DOCK},
+        {KE_KEY, 0x02, KEY_BRIGHTNESSUP},
+        {KE_KEY, 0x03, KEY_BRIGHTNESSDOWN},
+        {KE_KEY, 0x04, KEY_HELP},
+        {KE_END, 0}
+};
+
+static struct input_dev *hp_wmi_input_dev;
+static struct platform_device *hp_wmi_platform_dev;
+
+static struct rfkill *wifi_rfkill;
+static struct rfkill *bluetooth_rfkill;
+static struct rfkill *wwan_rfkill;
+
+static struct platform_driver hp_wmi_driver = {
+        .driver = {
+                   .name = "hp-wmi",
+                   .owner = THIS_MODULE,
+        },
+        .probe = hp_wmi_bios_setup,
+        .remove = hp_wmi_bios_remove,
+};
+
+static int hp_wmi_perform_query(int query, int write, int value)
+{
+        struct bios_return bios_return;
+        acpi_status status;
+        union acpi_object *obj;
+        struct bios_args args = {
+                .signature = 0x55434553,
+                .command = write ? 0x2 : 0x1,
+                .commandtype = query,
+                .datasize = write ? 0x4 : 0,
+                .data = value,
+        };
+        struct acpi_buffer input = { sizeof(struct bios_args), &args };
+        struct acpi_buffer output = { ACPI_ALLOCATE_BUFFER, NULL };
+
+        status = wmi_evaluate_method(HPWMI_BIOS_GUID, 0, 0x3, &input, &output);
+
+        obj = output.pointer;
+
+        if (!obj || obj->type != ACPI_TYPE_BUFFER)
+                return -EINVAL;
+
+        bios_return = *((struct bios_return *)obj->buffer.pointer);
+        if (bios_return.return_code > 0)
+                return bios_return.return_code * -1;
+        else
+                return bios_return.value;
+}
+
+static int hp_wmi_display_state(void)
+{
+        return hp_wmi_perform_query(HPWMI_DISPLAY_QUERY, 0, 0);
+}
+
+static int hp_wmi_hddtemp_state(void)
+{
+        return hp_wmi_perform_query(HPWMI_HDDTEMP_QUERY, 0, 0);
+}
+
+static int hp_wmi_als_state(void)
+{
+        return hp_wmi_perform_query(HPWMI_ALS_QUERY, 0, 0);
+}
+
+static int hp_wmi_dock_state(void)
+{
+        return hp_wmi_perform_query(HPWMI_DOCK_QUERY, 0, 0);
+}
+
+static int hp_wmi_wifi_set(void *data, enum rfkill_state state)
+{
+        if (state)
+                return hp_wmi_perform_query(HPWMI_WIRELESS_QUERY, 1, 0x101);
+        else
+                return hp_wmi_perform_query(HPWMI_WIRELESS_QUERY, 1, 0x100);
+}
+
+static int hp_wmi_bluetooth_set(void *data, enum rfkill_state state)
+{
+        if (state)
+                return hp_wmi_perform_query(HPWMI_WIRELESS_QUERY, 1, 0x202);
+        else
+                return hp_wmi_perform_query(HPWMI_WIRELESS_QUERY, 1, 0x200);
+}
+
+static int hp_wmi_wwan_set(void *data, enum rfkill_state state)
+{
+        if (state)
+                return hp_wmi_perform_query(HPWMI_WIRELESS_QUERY, 1, 0x404);
+        else
+                return hp_wmi_perform_query(HPWMI_WIRELESS_QUERY, 1, 0x400);
+}
+
+static int hp_wmi_wifi_state(void)
+{
+        int wireless = hp_wmi_perform_query(HPWMI_WIRELESS_QUERY, 0, 0);
+
+        if (wireless & 0x100)
+                return 1;
+        else
+                return 0;
+}
+
+static int hp_wmi_bluetooth_state(void)
+{
+        int wireless = hp_wmi_perform_query(HPWMI_WIRELESS_QUERY, 0, 0);
+
+        if (wireless & 0x10000)
+                return 1;
+        else
+                return 0;
+}
+
+static int hp_wmi_wwan_state(void)
+{
+        int wireless = hp_wmi_perform_query(HPWMI_WIRELESS_QUERY, 0, 0);
+
+        if (wireless & 0x1000000)
+                return 1;
+        else
+                return 0;
+}
+
+static ssize_t show_display(struct device *dev, struct device_attribute *attr,
+                            char *buf)
+{
+        int value = hp_wmi_display_state();
+        if (value < 0)
+                return -EINVAL;
+        return sprintf(buf, "%d\n", value);
+}
+
+static ssize_t show_hddtemp(struct device *dev, struct device_attribute *attr,
+                            char *buf)
+{
+        int value = hp_wmi_hddtemp_state();
+        if (value < 0)
+                return -EINVAL;
+        return sprintf(buf, "%d\n", value);
+}
+
+static ssize_t show_als(struct device *dev, struct device_attribute *attr,
+                        char *buf)
+{
+        int value = hp_wmi_als_state();
+        if (value < 0)
+                return -EINVAL;
+        return sprintf(buf, "%d\n", value);
+}
+
+static ssize_t show_dock(struct device *dev, struct device_attribute *attr,
+                         char *buf)
+{
+        int value = hp_wmi_dock_state();
+        if (value < 0)
+                return -EINVAL;
+        return sprintf(buf, "%d\n", value);
+}
+
+static ssize_t set_als(struct device *dev, struct device_attribute *attr,
+                       const char *buf, size_t count)
+{
+        u32 tmp = simple_strtoul(buf, NULL, 10);
+        hp_wmi_perform_query(HPWMI_ALS_QUERY, 1, tmp);
+        return count;
+}
+
+static DEVICE_ATTR(display, S_IRUGO, show_display, NULL);
+static DEVICE_ATTR(hddtemp, S_IRUGO, show_hddtemp, NULL);
+static DEVICE_ATTR(als, S_IRUGO | S_IWUSR, show_als, set_als);
+static DEVICE_ATTR(dock, S_IRUGO, show_dock, NULL);
+
+static struct key_entry *hp_wmi_get_entry_by_scancode(int code)
+{
+        struct key_entry *key;
+
+        for (key = hp_wmi_keymap; key->type != KE_END; key++)
+                if (code == key->code)
+                        return key;
+
+        return NULL;
+}
+
+static struct key_entry *hp_wmi_get_entry_by_keycode(int keycode)
+{
+        struct key_entry *key;
+
+        for (key = hp_wmi_keymap; key->type != KE_END; key++)
+                if (key->type == KE_KEY && keycode == key->keycode)
+                        return key;
+
+        return NULL;
+}
+
+static int hp_wmi_getkeycode(struct input_dev *dev, int scancode, int *keycode)
+{
+        struct key_entry *key = hp_wmi_get_entry_by_scancode(scancode);
+
+        if (key && key->type == KE_KEY) {
+                *keycode = key->keycode;
+                return 0;
+        }
+
+        return -EINVAL;
+}
+
+static int hp_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 = hp_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 (!hp_wmi_get_entry_by_keycode(old_keycode))
+                        clear_bit(old_keycode, dev->keybit);
+                return 0;
+        }
+
+        return -EINVAL;
+}
+
+void hp_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 && obj->buffer.length == 8) {
+                int eventcode = *((u8 *) obj->buffer.pointer);
+                key = hp_wmi_get_entry_by_scancode(eventcode);
+                if (key) {
+                        switch (key->type) {
+                        case KE_KEY:
+                                input_report_key(hp_wmi_input_dev,
+                                                 key->keycode, 1);
+                                input_sync(hp_wmi_input_dev);
+                                input_report_key(hp_wmi_input_dev,
+                                                 key->keycode, 0);
+                                input_sync(hp_wmi_input_dev);
+                                break;
+                        case KE_SW:
+                                input_report_switch(hp_wmi_input_dev,
+                                                    key->keycode,
+                                                    hp_wmi_dock_state());
+                                input_sync(hp_wmi_input_dev);
+                                break;
+                        }
+                } else if (eventcode == 0x5) {
+                        if (wifi_rfkill)
+                                wifi_rfkill->state = hp_wmi_wifi_state();
+                        if (bluetooth_rfkill)
+                                bluetooth_rfkill->state =
+                                    hp_wmi_bluetooth_state();
+                        if (wwan_rfkill)
+                                wwan_rfkill->state = hp_wmi_wwan_state();
+                } else
+                        printk(KERN_INFO "HP WMI: Unknown key pressed - %x\n",
+                               eventcode);
+        } else
+                printk(KERN_INFO "HP WMI: Unknown response received\n");
+}
+
+static int __init hp_wmi_input_setup(void)
+{
+        struct key_entry *key;
+        int err;
+
+        hp_wmi_input_dev = input_allocate_device();
+
+        hp_wmi_input_dev->name = "HP WMI hotkeys";
+        hp_wmi_input_dev->phys = "wmi/input0";
+        hp_wmi_input_dev->id.bustype = BUS_HOST;
+        hp_wmi_input_dev->getkeycode = hp_wmi_getkeycode;
+        hp_wmi_input_dev->setkeycode = hp_wmi_setkeycode;
+
+        for (key = hp_wmi_keymap; key->type != KE_END; key++) {
+                switch (key->type) {
+                case KE_KEY:
+                        set_bit(EV_KEY, hp_wmi_input_dev->evbit);
+                        set_bit(key->keycode, hp_wmi_input_dev->keybit);
+                        break;
+                case KE_SW:
+                        set_bit(EV_SW, hp_wmi_input_dev->evbit);
+                        set_bit(key->keycode, hp_wmi_input_dev->swbit);
+                        break;
+                }
+        }
+
+        err = input_register_device(hp_wmi_input_dev);
+
+        if (err) {
+                input_free_device(hp_wmi_input_dev);
+                return err;
+        }
+
+        return 0;
+}
+
+static void cleanup_sysfs(struct platform_device *device)
+{
+        device_remove_file(&device->dev, &dev_attr_display);
+        device_remove_file(&device->dev, &dev_attr_hddtemp);
+        device_remove_file(&device->dev, &dev_attr_als);
+        device_remove_file(&device->dev, &dev_attr_dock);
+}
+
+static int __init hp_wmi_bios_setup(struct platform_device *device)
+{
+        int err;
+
+        err = device_create_file(&device->dev, &dev_attr_display);
+        if (err)
+                goto add_sysfs_error;
+        err = device_create_file(&device->dev, &dev_attr_hddtemp);
+        if (err)
+                goto add_sysfs_error;
+        err = device_create_file(&device->dev, &dev_attr_als);
+        if (err)
+                goto add_sysfs_error;
+        err = device_create_file(&device->dev, &dev_attr_dock);
+        if (err)
+                goto add_sysfs_error;
+
+        wifi_rfkill = rfkill_allocate(&device->dev, RFKILL_TYPE_WLAN);
+        wifi_rfkill->name = "hp-wifi";
+        wifi_rfkill->state = hp_wmi_wifi_state();
+        wifi_rfkill->toggle_radio = hp_wmi_wifi_set;
+        wifi_rfkill->user_claim_unsupported = 1;
+
+        bluetooth_rfkill = rfkill_allocate(&device->dev,
+                                           RFKILL_TYPE_BLUETOOTH);
+        bluetooth_rfkill->name = "hp-bluetooth";
+        bluetooth_rfkill->state = hp_wmi_bluetooth_state();
+        bluetooth_rfkill->toggle_radio = hp_wmi_bluetooth_set;
+        bluetooth_rfkill->user_claim_unsupported = 1;
+
+        wwan_rfkill = rfkill_allocate(&device->dev, RFKILL_TYPE_WIMAX);
+        wwan_rfkill->name = "hp-wwan";
+        wwan_rfkill->state = hp_wmi_wwan_state();
+        wwan_rfkill->toggle_radio = hp_wmi_wwan_set;
+        wwan_rfkill->user_claim_unsupported = 1;
+
+        rfkill_register(wifi_rfkill);
+        rfkill_register(bluetooth_rfkill);
+        rfkill_register(wwan_rfkill);
+
+        return 0;
+add_sysfs_error:
+        cleanup_sysfs(device);
+        return err;
+}
+
+static int __exit hp_wmi_bios_remove(struct platform_device *device)
+{
+        cleanup_sysfs(device);
+
+        rfkill_unregister(wifi_rfkill);
+        rfkill_unregister(bluetooth_rfkill);
+        rfkill_unregister(wwan_rfkill);
+
+        return 0;
+}
+
+static int __init hp_wmi_init(void)
+{
+        int err;
+
+        if (wmi_has_guid(HPWMI_EVENT_GUID)) {
+                err = wmi_install_notify_handler(HPWMI_EVENT_GUID,
+                                                 hp_wmi_notify, NULL);
+                if (!err)
+                        hp_wmi_input_setup();
+        }
+
+        if (wmi_has_guid(HPWMI_BIOS_GUID)) {
+                err = platform_driver_register(&hp_wmi_driver);
+                if (err)
+                        return 0;
+                hp_wmi_platform_dev = platform_device_alloc("hp-wmi", -1);
+                if (!hp_wmi_platform_dev) {
+                        platform_driver_unregister(&hp_wmi_driver);
+                        return 0;
+                }
+                platform_device_add(hp_wmi_platform_dev);
+        }
+
+        return 0;
+}
+
+static void __exit hp_wmi_exit(void)
+{
+        if (wmi_has_guid(HPWMI_EVENT_GUID)) {
+                wmi_remove_notify_handler(HPWMI_EVENT_GUID);
+                input_unregister_device(hp_wmi_input_dev);
+        }
+        if (hp_wmi_platform_dev) {
+                platform_device_del(hp_wmi_platform_dev);
+                platform_driver_unregister(&hp_wmi_driver);
+        }
+}
+
+module_init(hp_wmi_init);
+module_exit(hp_wmi_exit);