Techwizz/kernel-fxtec-pro1x
1
0
Fork 0
Code Issues Pull requests Projects Releases Packages Wiki Activity
kernel-fxtec-pro1x/drivers/platform/x86/eeepc-wmi.c
Chris Bagwell 7f80d734b3 eeepc-wmi: Add cpufv sysfs interface 
eeepc-laptop provides a sysfs interface to read and control what it
calls cpufv.  When WMI is enabled, the ACPI interface changes slightly
and becames a write-only control with 3 valid values.

Expose cpufv again to allow for user space utils that can extended battery
life noticably and come a little closer to parity with eeepc-laptop.

Write-only is OK for most user space apps because read status was
mostly used to prevent unneeded mode changes.  Since this same check
to ignore changes to same mode also exists in the DSDT then it was
wasted ACPI call.

acpi_osi="!Windows 2009" can be used for get back eeepc-laptop's
read support of cpufv for debugging things such as behaviour
during resume.

This patch was tested with EEE PC 1005PE by monitoring powertop output while
writing values of "0", "1", and "2" and by reviewing the decompiled DSDT of
an 1201NL and comparing it to 1005PE's DSDT.

Signed-off-by: Chris Bagwell <chris@cnpbagwell.com>
Signed-off-by: Matthew Garrett <mjg@redhat.com>
2010-10-21 10:10:53 -04:00

469 lines
11 KiB
C
Raw Blame History

/*
* 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_METHODID_CFVS 0x53564643
#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_KEY, 0x6b, { KEY_F13 } }, /* Disable Touchpad */
{ KE_KEY, 0xe1, { KEY_F14 } },
{ KE_KEY, 0xe9, { KEY_DISPLAY_OFF } },
{ KE_KEY, 0xe0, { KEY_PROG1 } },
{ KE_KEY, 0x5c, { KEY_F15 } },
{ 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 = old;
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 store_cpufv(struct device *dev, struct device_attribute *attr,
const char *buf, size_t count)
{
int value;
struct acpi_buffer input = { (acpi_size)sizeof(value), &value };
acpi_status status;
if (!count || sscanf(buf, "%i", &value) != 1)
return -EINVAL;
if (value < 0 || value > 2)
return -EINVAL;
status = wmi_evaluate_method(EEEPC_WMI_MGMT_GUID,
1, EEEPC_WMI_METHODID_CFVS, &input, NULL);
if (ACPI_FAILURE(status))
return -EIO;
else
return count;
}
static DEVICE_ATTR(cpufv, S_IRUGO | S_IWUSR, NULL, store_cpufv);
static void eeepc_wmi_sysfs_exit(struct platform_device *device)
{
device_remove_file(&device->dev, &dev_attr_cpufv);
}
static int eeepc_wmi_sysfs_init(struct platform_device *device)
{
int retval = -ENOMEM;
retval = device_create_file(&device->dev, &dev_attr_cpufv);
if (retval)
goto error_sysfs;
return 0;
error_sysfs:
eeepc_wmi_sysfs_exit(platform_device);
return retval;
}
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;
}
err = eeepc_wmi_sysfs_init(platform_device);
if (err)
goto del_sysfs;
return 0;
del_sysfs:
eeepc_wmi_sysfs_exit(platform_device);
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_wmi_sysfs_exit(platform_device);
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);
Reference in a new issue View git blame Copy permalink