linux/drivers/platform/x86/eeepc-wmi.c
Yong Wang 3d7b165539 eeepc-wmi: add backlight support
Add backlight support for WMI based Eee PC laptops.

Signed-off-by: Yong Wang <yong.y.wang@intel.com>
Signed-off-by: Matthew Garrett <mjg@redhat.com>
Reviewed-by: Corentin Chary <corentincj@iksaif.net>
2010-04-12 13:02:52 -04:00

413 lines
9.7 KiB
C

/*
* Eee PC WMI hotkey driver
*
* Copyright(C) 2010 Intel Corporation.
*
* 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
*/
#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/init.h>
#include <linux/types.h>
#include <linux/slab.h>
#include <linux/input.h>
#include <linux/input/sparse-keymap.h>
#include <linux/fb.h>
#include <linux/backlight.h>
#include <linux/platform_device.h>
#include <acpi/acpi_bus.h>
#include <acpi/acpi_drivers.h>
#define EEEPC_WMI_FILE "eeepc-wmi"
MODULE_AUTHOR("Yong Wang <yong.y.wang@intel.com>");
MODULE_DESCRIPTION("Eee PC WMI Hotkey Driver");
MODULE_LICENSE("GPL");
#define EEEPC_WMI_EVENT_GUID "ABBC0F72-8EA1-11D1-00A0-C90629100000"
#define EEEPC_WMI_MGMT_GUID "97845ED0-4E6D-11DE-8A39-0800200C9A66"
MODULE_ALIAS("wmi:"EEEPC_WMI_EVENT_GUID);
MODULE_ALIAS("wmi:"EEEPC_WMI_MGMT_GUID);
#define NOTIFY_BRNUP_MIN 0x11
#define NOTIFY_BRNUP_MAX 0x1f
#define NOTIFY_BRNDOWN_MIN 0x20
#define NOTIFY_BRNDOWN_MAX 0x2e
#define EEEPC_WMI_METHODID_DEVS 0x53564544
#define EEEPC_WMI_METHODID_DSTS 0x53544344
#define EEEPC_WMI_DEVID_BACKLIGHT 0x00050012
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},
};
struct bios_args {
u32 dev_id;
u32 ctrl_param;
};
struct eeepc_wmi {
struct input_dev *inputdev;
struct backlight_device *backlight_device;
};
static struct platform_device *platform_device;
static int eeepc_wmi_input_init(struct eeepc_wmi *eeepc)
{
int err;
eeepc->inputdev = input_allocate_device();
if (!eeepc->inputdev)
return -ENOMEM;
eeepc->inputdev->name = "Eee PC WMI hotkeys";
eeepc->inputdev->phys = EEEPC_WMI_FILE "/input0";
eeepc->inputdev->id.bustype = BUS_HOST;
eeepc->inputdev->dev.parent = &platform_device->dev;
err = sparse_keymap_setup(eeepc->inputdev, eeepc_wmi_keymap, NULL);
if (err)
goto err_free_dev;
err = input_register_device(eeepc->inputdev);
if (err)
goto err_free_keymap;
return 0;
err_free_keymap:
sparse_keymap_free(eeepc->inputdev);
err_free_dev:
input_free_device(eeepc->inputdev);
return err;
}
static void eeepc_wmi_input_exit(struct eeepc_wmi *eeepc)
{
if (eeepc->inputdev) {
sparse_keymap_free(eeepc->inputdev);
input_unregister_device(eeepc->inputdev);
}
eeepc->inputdev = NULL;
}
static acpi_status eeepc_wmi_get_devstate(u32 dev_id, u32 *ctrl_param)
{
struct acpi_buffer input = { (acpi_size)sizeof(u32), &dev_id };
struct acpi_buffer output = { ACPI_ALLOCATE_BUFFER, NULL };
union acpi_object *obj;
acpi_status status;
u32 tmp;
status = wmi_evaluate_method(EEEPC_WMI_MGMT_GUID,
1, EEEPC_WMI_METHODID_DSTS, &input, &output);
if (ACPI_FAILURE(status))
return status;
obj = (union acpi_object *)output.pointer;
if (obj && obj->type == ACPI_TYPE_INTEGER)
tmp = (u32)obj->integer.value;
else
tmp = 0;
if (ctrl_param)
*ctrl_param = tmp;
kfree(obj);
return status;
}
static acpi_status eeepc_wmi_set_devstate(u32 dev_id, u32 ctrl_param)
{
struct bios_args args = {
.dev_id = dev_id,
.ctrl_param = ctrl_param,
};
struct acpi_buffer input = { (acpi_size)sizeof(args), &args };
acpi_status status;
status = wmi_evaluate_method(EEEPC_WMI_MGMT_GUID,
1, EEEPC_WMI_METHODID_DEVS, &input, NULL);
return status;
}
static int read_brightness(struct backlight_device *bd)
{
static u32 ctrl_param;
acpi_status status;
status = eeepc_wmi_get_devstate(EEEPC_WMI_DEVID_BACKLIGHT, &ctrl_param);
if (ACPI_FAILURE(status))
return -1;
else
return ctrl_param & 0xFF;
}
static int update_bl_status(struct backlight_device *bd)
{
static u32 ctrl_param;
acpi_status status;
ctrl_param = bd->props.brightness;
status = eeepc_wmi_set_devstate(EEEPC_WMI_DEVID_BACKLIGHT, ctrl_param);
if (ACPI_FAILURE(status))
return -1;
else
return 0;
}
static const struct backlight_ops eeepc_wmi_bl_ops = {
.get_brightness = read_brightness,
.update_status = update_bl_status,
};
static int eeepc_wmi_backlight_notify(struct eeepc_wmi *eeepc, int code)
{
struct backlight_device *bd = eeepc->backlight_device;
int old = bd->props.brightness;
int new;
if (code >= NOTIFY_BRNUP_MIN && code <= NOTIFY_BRNUP_MAX)
new = code - NOTIFY_BRNUP_MIN + 1;
else if (code >= NOTIFY_BRNDOWN_MIN && code <= NOTIFY_BRNDOWN_MAX)
new = code - NOTIFY_BRNDOWN_MIN;
bd->props.brightness = new;
backlight_update_status(bd);
backlight_force_update(bd, BACKLIGHT_UPDATE_HOTKEY);
return old;
}
static int eeepc_wmi_backlight_init(struct eeepc_wmi *eeepc)
{
struct backlight_device *bd;
struct backlight_properties props;
memset(&props, 0, sizeof(struct backlight_properties));
props.max_brightness = 15;
bd = backlight_device_register(EEEPC_WMI_FILE,
&platform_device->dev, eeepc,
&eeepc_wmi_bl_ops, &props);
if (IS_ERR(bd)) {
pr_err("Could not register backlight device\n");
return PTR_ERR(bd);
}
eeepc->backlight_device = bd;
bd->props.brightness = read_brightness(bd);
bd->props.power = FB_BLANK_UNBLANK;
backlight_update_status(bd);
return 0;
}
static void eeepc_wmi_backlight_exit(struct eeepc_wmi *eeepc)
{
if (eeepc->backlight_device)
backlight_device_unregister(eeepc->backlight_device);
eeepc->backlight_device = NULL;
}
static void eeepc_wmi_notify(u32 value, void *context)
{
struct eeepc_wmi *eeepc = context;
struct acpi_buffer response = { ACPI_ALLOCATE_BUFFER, NULL };
union acpi_object *obj;
acpi_status status;
int code;
int orig_code;
status = wmi_get_event_data(value, &response);
if (status != AE_OK) {
pr_err("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;
orig_code = code;
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 (code == NOTIFY_BRNUP_MIN || code == NOTIFY_BRNDOWN_MIN) {
if (!acpi_video_backlight_support())
eeepc_wmi_backlight_notify(eeepc, orig_code);
}
if (!sparse_keymap_report_event(eeepc->inputdev,
code, 1, true))
pr_info("Unknown key %x pressed\n", code);
}
kfree(obj);
}
static int __devinit eeepc_wmi_platform_probe(struct platform_device *device)
{
struct eeepc_wmi *eeepc;
int err;
acpi_status status;
eeepc = platform_get_drvdata(device);
err = eeepc_wmi_input_init(eeepc);
if (err)
goto error_input;
if (!acpi_video_backlight_support()) {
err = eeepc_wmi_backlight_init(eeepc);
if (err)
goto error_backlight;
} else
pr_info("Backlight controlled by ACPI video driver\n");
status = wmi_install_notify_handler(EEEPC_WMI_EVENT_GUID,
eeepc_wmi_notify, eeepc);
if (ACPI_FAILURE(status)) {
pr_err("Unable to register notify handler - %d\n",
status);
err = -ENODEV;
goto error_wmi;
}
return 0;
error_wmi:
eeepc_wmi_backlight_exit(eeepc);
error_backlight:
eeepc_wmi_input_exit(eeepc);
error_input:
return err;
}
static int __devexit eeepc_wmi_platform_remove(struct platform_device *device)
{
struct eeepc_wmi *eeepc;
eeepc = platform_get_drvdata(device);
wmi_remove_notify_handler(EEEPC_WMI_EVENT_GUID);
eeepc_wmi_backlight_exit(eeepc);
eeepc_wmi_input_exit(eeepc);
return 0;
}
static struct platform_driver platform_driver = {
.driver = {
.name = EEEPC_WMI_FILE,
.owner = THIS_MODULE,
},
.probe = eeepc_wmi_platform_probe,
.remove = __devexit_p(eeepc_wmi_platform_remove),
};
static int __init eeepc_wmi_init(void)
{
struct eeepc_wmi *eeepc;
int err;
if (!wmi_has_guid(EEEPC_WMI_EVENT_GUID) ||
!wmi_has_guid(EEEPC_WMI_MGMT_GUID)) {
pr_warning("No known WMI GUID found\n");
return -ENODEV;
}
eeepc = kzalloc(sizeof(struct eeepc_wmi), GFP_KERNEL);
if (!eeepc)
return -ENOMEM;
platform_device = platform_device_alloc(EEEPC_WMI_FILE, -1);
if (!platform_device) {
pr_warning("Unable to allocate platform device\n");
err = -ENOMEM;
goto fail_platform;
}
err = platform_device_add(platform_device);
if (err) {
pr_warning("Unable to add platform device\n");
goto put_dev;
}
platform_set_drvdata(platform_device, eeepc);
err = platform_driver_register(&platform_driver);
if (err) {
pr_warning("Unable to register platform driver\n");
goto del_dev;
}
return 0;
del_dev:
platform_device_del(platform_device);
put_dev:
platform_device_put(platform_device);
fail_platform:
kfree(eeepc);
return err;
}
static void __exit eeepc_wmi_exit(void)
{
struct eeepc_wmi *eeepc;
eeepc = platform_get_drvdata(platform_device);
platform_driver_unregister(&platform_driver);
platform_device_unregister(platform_device);
kfree(eeepc);
}
module_init(eeepc_wmi_init);
module_exit(eeepc_wmi_exit);