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WSL2-Linux-Kernel/drivers/platform/x86/panasonic-laptop.c

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/*
* Panasonic HotKey and LCD brightness control driver
* (C) 2004 Hiroshi Miura <miura@da-cha.org>
* (C) 2004 NTT DATA Intellilink Co. http://www.intellilink.co.jp/
* (C) YOKOTA Hiroshi <yokota (at) netlab. is. tsukuba. ac. jp>
* (C) 2004 David Bronaugh <dbronaugh>
* (C) 2006-2008 Harald Welte <laforge@gnumonks.org>
*
* derived from toshiba_acpi.c, Copyright (C) 2002-2004 John Belmonte
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License version 2 as
* publicshed by the Free Software Foundation.
*
* 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
*
*---------------------------------------------------------------------------
*
* ChangeLog:
* Sep.23, 2008 Harald Welte <laforge@gnumonks.org>
* -v0.95 rename driver from drivers/acpi/pcc_acpi.c to
* drivers/misc/panasonic-laptop.c
*
* Jul.04, 2008 Harald Welte <laforge@gnumonks.org>
* -v0.94 replace /proc interface with device attributes
* support {set,get}keycode on th input device
*
* Jun.27, 2008 Harald Welte <laforge@gnumonks.org>
* -v0.92 merge with 2.6.26-rc6 input API changes
* remove broken <= 2.6.15 kernel support
* resolve all compiler warnings
* various coding style fixes (checkpatch.pl)
* add support for backlight api
* major code restructuring
*
* Dac.28, 2007 Harald Welte <laforge@gnumonks.org>
* -v0.91 merge with 2.6.24-rc6 ACPI changes
*
* Nov.04, 2006 Hiroshi Miura <miura@da-cha.org>
* -v0.9 remove warning about section reference.
* remove acpi_os_free
* add /proc/acpi/pcc/brightness interface for HAL access
* merge dbronaugh's enhancement
* Aug.17, 2004 David Bronaugh (dbronaugh)
* - Added screen brightness setting interface
* Thanks to FreeBSD crew (acpi_panasonic.c)
* for the ideas I needed to accomplish it
*
* May.29, 2006 Hiroshi Miura <miura@da-cha.org>
* -v0.8.4 follow to change keyinput structure
* thanks Fabian Yamaguchi <fabs@cs.tu-berlin.de>,
* Jacob Bower <jacob.bower@ic.ac.uk> and
* Hiroshi Yokota for providing solutions.
*
* Oct.02, 2004 Hiroshi Miura <miura@da-cha.org>
* -v0.8.2 merge code of YOKOTA Hiroshi
* <yokota@netlab.is.tsukuba.ac.jp>.
* Add sticky key mode interface.
* Refactoring acpi_pcc_generate_keyinput().
*
* Sep.15, 2004 Hiroshi Miura <miura@da-cha.org>
* -v0.8 Generate key input event on input subsystem.
* This is based on yet another driver written by
* Ryuta Nakanishi.
*
* Sep.10, 2004 Hiroshi Miura <miura@da-cha.org>
* -v0.7 Change proc interface functions using seq_file
* facility as same as other ACPI drivers.
*
* Aug.28, 2004 Hiroshi Miura <miura@da-cha.org>
* -v0.6.4 Fix a silly error with status checking
*
* Aug.25, 2004 Hiroshi Miura <miura@da-cha.org>
* -v0.6.3 replace read_acpi_int by standard function
* acpi_evaluate_integer
* some clean up and make smart copyright notice.
* fix return value of pcc_acpi_get_key()
* fix checking return value of acpi_bus_register_driver()
*
* Aug.22, 2004 David Bronaugh <dbronaugh@linuxboxen.org>
* -v0.6.2 Add check on ACPI data (num_sifr)
* Coding style cleanups, better error messages/handling
* Fixed an off-by-one error in memory allocation
*
* Aug.21, 2004 David Bronaugh <dbronaugh@linuxboxen.org>
* -v0.6.1 Fix a silly error with status checking
*
* Aug.20, 2004 David Bronaugh <dbronaugh@linuxboxen.org>
* - v0.6 Correct brightness controls to reflect reality
* based on information gleaned by Hiroshi Miura
* and discussions with Hiroshi Miura
*
* Aug.10, 2004 Hiroshi Miura <miura@da-cha.org>
* - v0.5 support LCD brightness control
* based on the disclosed information by MEI.
*
* Jul.25, 2004 Hiroshi Miura <miura@da-cha.org>
* - v0.4 first post version
* add function to retrive SIFR
*
* Jul.24, 2004 Hiroshi Miura <miura@da-cha.org>
* - v0.3 get proper status of hotkey
*
* Jul.22, 2004 Hiroshi Miura <miura@da-cha.org>
* - v0.2 add HotKey handler
*
* Jul.17, 2004 Hiroshi Miura <miura@da-cha.org>
* - v0.1 start from toshiba_acpi driver written by John Belmonte
*
*/
#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/init.h>
#include <linux/types.h>
#include <linux/backlight.h>
#include <linux/ctype.h>
#include <linux/seq_file.h>
#include <linux/uaccess.h>
#include <acpi/acpi_bus.h>
#include <acpi/acpi_drivers.h>
#include <linux/input.h>
#ifndef ACPI_HOTKEY_COMPONENT
#define ACPI_HOTKEY_COMPONENT 0x10000000
#endif
#define _COMPONENT ACPI_HOTKEY_COMPONENT
MODULE_AUTHOR("Hiroshi Miura, David Bronaugh and Harald Welte");
MODULE_DESCRIPTION("ACPI HotKey driver for Panasonic Let's Note laptops");
MODULE_LICENSE("GPL");
#define LOGPREFIX "pcc_acpi: "
/* Define ACPI PATHs */
/* Lets note hotkeys */
#define METHOD_HKEY_QUERY "HINF"
#define METHOD_HKEY_SQTY "SQTY"
#define METHOD_HKEY_SINF "SINF"
#define METHOD_HKEY_SSET "SSET"
#define HKEY_NOTIFY 0x80
#define ACPI_PCC_DRIVER_NAME "Panasonic Laptop Support"
#define ACPI_PCC_DEVICE_NAME "Hotkey"
#define ACPI_PCC_CLASS "pcc"
#define ACPI_PCC_INPUT_PHYS "panasonic/hkey0"
/* LCD_TYPEs: 0 = Normal, 1 = Semi-transparent
ENV_STATEs: Normal temp=0x01, High temp=0x81, N/A=0x00
*/
enum SINF_BITS { SINF_NUM_BATTERIES = 0,
SINF_LCD_TYPE,
SINF_AC_MAX_BRIGHT,
SINF_AC_MIN_BRIGHT,
SINF_AC_CUR_BRIGHT,
SINF_DC_MAX_BRIGHT,
SINF_DC_MIN_BRIGHT,
SINF_DC_CUR_BRIGHT,
SINF_MUTE,
SINF_RESERVED,
SINF_ENV_STATE,
SINF_STICKY_KEY = 0x80,
};
/* R1 handles SINF_AC_CUR_BRIGHT as SINF_CUR_BRIGHT, doesn't know AC state */
static int acpi_pcc_hotkey_add(struct acpi_device *device);
static int acpi_pcc_hotkey_remove(struct acpi_device *device, int type);
static int acpi_pcc_hotkey_resume(struct acpi_device *device);
static void acpi_pcc_hotkey_notify(struct acpi_device *device, u32 event);
static const struct acpi_device_id pcc_device_ids[] = {
{ "MAT0012", 0},
{ "MAT0013", 0},
{ "MAT0018", 0},
{ "MAT0019", 0},
{ "", 0},
};
MODULE_DEVICE_TABLE(acpi, pcc_device_ids);
static struct acpi_driver acpi_pcc_driver = {
.name = ACPI_PCC_DRIVER_NAME,
.class = ACPI_PCC_CLASS,
.ids = pcc_device_ids,
.ops = {
.add = acpi_pcc_hotkey_add,
.remove = acpi_pcc_hotkey_remove,
.resume = acpi_pcc_hotkey_resume,
.notify = acpi_pcc_hotkey_notify,
},
};
#define KEYMAP_SIZE 11
static const unsigned int initial_keymap[KEYMAP_SIZE] = {
/* 0 */ KEY_RESERVED,
/* 1 */ KEY_BRIGHTNESSDOWN,
/* 2 */ KEY_BRIGHTNESSUP,
/* 3 */ KEY_DISPLAYTOGGLE,
/* 4 */ KEY_MUTE,
/* 5 */ KEY_VOLUMEDOWN,
/* 6 */ KEY_VOLUMEUP,
/* 7 */ KEY_SLEEP,
/* 8 */ KEY_PROG1, /* Change CPU boost */
/* 9 */ KEY_BATTERY,
/* 10 */ KEY_SUSPEND,
};
struct pcc_acpi {
acpi_handle handle;
unsigned long num_sifr;
int sticky_mode;
u32 *sinf;
struct acpi_device *device;
struct input_dev *input_dev;
struct backlight_device *backlight;
unsigned int keymap[KEYMAP_SIZE];
};
struct pcc_keyinput {
struct acpi_hotkey *hotkey;
};
/* method access functions */
static int acpi_pcc_write_sset(struct pcc_acpi *pcc, int func, int val)
{
union acpi_object in_objs[] = {
{ .integer.type = ACPI_TYPE_INTEGER,
.integer.value = func, },
{ .integer.type = ACPI_TYPE_INTEGER,
.integer.value = val, },
};
struct acpi_object_list params = {
.count = ARRAY_SIZE(in_objs),
.pointer = in_objs,
};
acpi_status status = AE_OK;
status = acpi_evaluate_object(pcc->handle, METHOD_HKEY_SSET,
&params, NULL);
return status == AE_OK;
}
static inline int acpi_pcc_get_sqty(struct acpi_device *device)
{
unsigned long long s;
acpi_status status;
status = acpi_evaluate_integer(device->handle, METHOD_HKEY_SQTY,
NULL, &s);
if (ACPI_SUCCESS(status))
return s;
else {
ACPI_DEBUG_PRINT((ACPI_DB_ERROR,
"evaluation error HKEY.SQTY\n"));
return -EINVAL;
}
}
static int acpi_pcc_retrieve_biosdata(struct pcc_acpi *pcc, u32 *sinf)
{
acpi_status status;
struct acpi_buffer buffer = {ACPI_ALLOCATE_BUFFER, NULL};
union acpi_object *hkey = NULL;
int i;
status = acpi_evaluate_object(pcc->handle, METHOD_HKEY_SINF, NULL,
&buffer);
if (ACPI_FAILURE(status)) {
ACPI_DEBUG_PRINT((ACPI_DB_ERROR,
"evaluation error HKEY.SINF\n"));
return 0;
}
hkey = buffer.pointer;
if (!hkey || (hkey->type != ACPI_TYPE_PACKAGE)) {
ACPI_DEBUG_PRINT((ACPI_DB_ERROR, "Invalid HKEY.SINF\n"));
goto end;
}
if (pcc->num_sifr < hkey->package.count) {
ACPI_DEBUG_PRINT((ACPI_DB_ERROR,
"SQTY reports bad SINF length\n"));
status = AE_ERROR;
goto end;
}
for (i = 0; i < hkey->package.count; i++) {
union acpi_object *element = &(hkey->package.elements[i]);
if (likely(element->type == ACPI_TYPE_INTEGER)) {
sinf[i] = element->integer.value;
} else
ACPI_DEBUG_PRINT((ACPI_DB_ERROR,
"Invalid HKEY.SINF data\n"));
}
sinf[hkey->package.count] = -1;
end:
kfree(buffer.pointer);
return status == AE_OK;
}
/* backlight API interface functions */
/* This driver currently treats AC and DC brightness identical,
* since we don't need to invent an interface to the core ACPI
* logic to receive events in case a power supply is plugged in
* or removed */
static int bl_get(struct backlight_device *bd)
{
struct pcc_acpi *pcc = bl_get_data(bd);
if (!acpi_pcc_retrieve_biosdata(pcc, pcc->sinf))
return -EIO;
return pcc->sinf[SINF_AC_CUR_BRIGHT];
}
static int bl_set_status(struct backlight_device *bd)
{
struct pcc_acpi *pcc = bl_get_data(bd);
int bright = bd->props.brightness;
int rc;
if (!acpi_pcc_retrieve_biosdata(pcc, pcc->sinf))
return -EIO;
if (bright < pcc->sinf[SINF_AC_MIN_BRIGHT])
bright = pcc->sinf[SINF_AC_MIN_BRIGHT];
if (bright < pcc->sinf[SINF_DC_MIN_BRIGHT])
bright = pcc->sinf[SINF_DC_MIN_BRIGHT];
if (bright < pcc->sinf[SINF_AC_MIN_BRIGHT] ||
bright > pcc->sinf[SINF_AC_MAX_BRIGHT])
return -EINVAL;
rc = acpi_pcc_write_sset(pcc, SINF_AC_CUR_BRIGHT, bright);
if (rc < 0)
return rc;
return acpi_pcc_write_sset(pcc, SINF_DC_CUR_BRIGHT, bright);
}
static const struct backlight_ops pcc_backlight_ops = {
.get_brightness = bl_get,
.update_status = bl_set_status,
};
/* sysfs user interface functions */
static ssize_t show_numbatt(struct device *dev, struct device_attribute *attr,
char *buf)
{
struct acpi_device *acpi = to_acpi_device(dev);
struct pcc_acpi *pcc = acpi_driver_data(acpi);
if (!acpi_pcc_retrieve_biosdata(pcc, pcc->sinf))
return -EIO;
return snprintf(buf, PAGE_SIZE, "%u\n", pcc->sinf[SINF_NUM_BATTERIES]);
}
static ssize_t show_lcdtype(struct device *dev, struct device_attribute *attr,
char *buf)
{
struct acpi_device *acpi = to_acpi_device(dev);
struct pcc_acpi *pcc = acpi_driver_data(acpi);
if (!acpi_pcc_retrieve_biosdata(pcc, pcc->sinf))
return -EIO;
return snprintf(buf, PAGE_SIZE, "%u\n", pcc->sinf[SINF_LCD_TYPE]);
}
static ssize_t show_mute(struct device *dev, struct device_attribute *attr,
char *buf)
{
struct acpi_device *acpi = to_acpi_device(dev);
struct pcc_acpi *pcc = acpi_driver_data(acpi);
if (!acpi_pcc_retrieve_biosdata(pcc, pcc->sinf))
return -EIO;
return snprintf(buf, PAGE_SIZE, "%u\n", pcc->sinf[SINF_MUTE]);
}
static ssize_t show_sticky(struct device *dev, struct device_attribute *attr,
char *buf)
{
struct acpi_device *acpi = to_acpi_device(dev);
struct pcc_acpi *pcc = acpi_driver_data(acpi);
if (!acpi_pcc_retrieve_biosdata(pcc, pcc->sinf))
return -EIO;
return snprintf(buf, PAGE_SIZE, "%u\n", pcc->sinf[SINF_STICKY_KEY]);
}
static ssize_t set_sticky(struct device *dev, struct device_attribute *attr,
const char *buf, size_t count)
{
struct acpi_device *acpi = to_acpi_device(dev);
struct pcc_acpi *pcc = acpi_driver_data(acpi);
int val;
if (count && sscanf(buf, "%i", &val) == 1 &&
(val == 0 || val == 1)) {
acpi_pcc_write_sset(pcc, SINF_STICKY_KEY, val);
pcc->sticky_mode = val;
}
return count;
}
static DEVICE_ATTR(numbatt, S_IRUGO, show_numbatt, NULL);
static DEVICE_ATTR(lcdtype, S_IRUGO, show_lcdtype, NULL);
static DEVICE_ATTR(mute, S_IRUGO, show_mute, NULL);
static DEVICE_ATTR(sticky_key, S_IRUGO | S_IWUSR, show_sticky, set_sticky);
static struct attribute *pcc_sysfs_entries[] = {
&dev_attr_numbatt.attr,
&dev_attr_lcdtype.attr,
&dev_attr_mute.attr,
&dev_attr_sticky_key.attr,
NULL,
};
static struct attribute_group pcc_attr_group = {
.name = NULL, /* put in device directory */
.attrs = pcc_sysfs_entries,
};
/* hotkey input device driver */
static int pcc_getkeycode(struct input_dev *dev,
unsigned int scancode, unsigned int *keycode)
{
struct pcc_acpi *pcc = input_get_drvdata(dev);
if (scancode >= ARRAY_SIZE(pcc->keymap))
return -EINVAL;
*keycode = pcc->keymap[scancode];
return 0;
}
static int keymap_get_by_keycode(struct pcc_acpi *pcc, unsigned int keycode)
{
int i;
for (i = 0; i < ARRAY_SIZE(pcc->keymap); i++) {
if (pcc->keymap[i] == keycode)
return i+1;
}
return 0;
}
static int pcc_setkeycode(struct input_dev *dev,
unsigned int scancode, unsigned int keycode)
{
struct pcc_acpi *pcc = input_get_drvdata(dev);
int oldkeycode;
if (scancode >= ARRAY_SIZE(pcc->keymap))
return -EINVAL;
oldkeycode = pcc->keymap[scancode];
pcc->keymap[scancode] = keycode;
set_bit(keycode, dev->keybit);
if (!keymap_get_by_keycode(pcc, oldkeycode))
clear_bit(oldkeycode, dev->keybit);
return 0;
}
static void acpi_pcc_generate_keyinput(struct pcc_acpi *pcc)
{
struct input_dev *hotk_input_dev = pcc->input_dev;
int rc;
int key_code, hkey_num;
unsigned long long result;
rc = acpi_evaluate_integer(pcc->handle, METHOD_HKEY_QUERY,
NULL, &result);
if (!ACPI_SUCCESS(rc)) {
ACPI_DEBUG_PRINT((ACPI_DB_ERROR,
"error getting hotkey status\n"));
return;
}
acpi_bus_generate_proc_event(pcc->device, HKEY_NOTIFY, result);
hkey_num = result & 0xf;
if (hkey_num < 0 || hkey_num >= ARRAY_SIZE(pcc->keymap)) {
ACPI_DEBUG_PRINT((ACPI_DB_ERROR,
"hotkey number out of range: %d\n",
hkey_num));
return;
}
key_code = pcc->keymap[hkey_num];
if (key_code != KEY_RESERVED) {
int pushed = (result & 0x80) ? TRUE : FALSE;
input_report_key(hotk_input_dev, key_code, pushed);
input_sync(hotk_input_dev);
}
return;
}
static void acpi_pcc_hotkey_notify(struct acpi_device *device, u32 event)
{
struct pcc_acpi *pcc = acpi_driver_data(device);
switch (event) {
case HKEY_NOTIFY:
acpi_pcc_generate_keyinput(pcc);
break;
default:
/* nothing to do */
break;
}
}
static int acpi_pcc_init_input(struct pcc_acpi *pcc)
{
int i, rc;
pcc->input_dev = input_allocate_device();
if (!pcc->input_dev) {
ACPI_DEBUG_PRINT((ACPI_DB_ERROR,
"Couldn't allocate input device for hotkey"));
return -ENOMEM;
}
pcc->input_dev->evbit[0] = BIT(EV_KEY);
pcc->input_dev->name = ACPI_PCC_DRIVER_NAME;
pcc->input_dev->phys = ACPI_PCC_INPUT_PHYS;
pcc->input_dev->id.bustype = BUS_HOST;
pcc->input_dev->id.vendor = 0x0001;
pcc->input_dev->id.product = 0x0001;
pcc->input_dev->id.version = 0x0100;
pcc->input_dev->getkeycode = pcc_getkeycode;
pcc->input_dev->setkeycode = pcc_setkeycode;
/* load initial keymap */
memcpy(pcc->keymap, initial_keymap, sizeof(pcc->keymap));
for (i = 0; i < ARRAY_SIZE(pcc->keymap); i++)
__set_bit(pcc->keymap[i], pcc->input_dev->keybit);
__clear_bit(KEY_RESERVED, pcc->input_dev->keybit);
input_set_drvdata(pcc->input_dev, pcc);
rc = input_register_device(pcc->input_dev);
if (rc < 0)
input_free_device(pcc->input_dev);
return rc;
}
/* kernel module interface */
static int acpi_pcc_hotkey_resume(struct acpi_device *device)
{
struct pcc_acpi *pcc = acpi_driver_data(device);
acpi_status status = AE_OK;
if (device == NULL || pcc == NULL)
return -EINVAL;
ACPI_DEBUG_PRINT((ACPI_DB_ERROR, "Sticky mode restore: %d\n",
pcc->sticky_mode));
status = acpi_pcc_write_sset(pcc, SINF_STICKY_KEY, pcc->sticky_mode);
return status == AE_OK ? 0 : -EINVAL;
}
static int acpi_pcc_hotkey_add(struct acpi_device *device)
{
struct backlight_properties props;
struct pcc_acpi *pcc;
int num_sifr, result;
if (!device)
return -EINVAL;
num_sifr = acpi_pcc_get_sqty(device);
if (num_sifr > 255) {
ACPI_DEBUG_PRINT((ACPI_DB_ERROR, "num_sifr too large"));
return -ENODEV;
}
pcc = kzalloc(sizeof(struct pcc_acpi), GFP_KERNEL);
if (!pcc) {
ACPI_DEBUG_PRINT((ACPI_DB_ERROR,
"Couldn't allocate mem for pcc"));
return -ENOMEM;
}
pcc->sinf = kzalloc(sizeof(u32) * (num_sifr + 1), GFP_KERNEL);
if (!pcc->sinf) {
result = -ENOMEM;
goto out_hotkey;
}
pcc->device = device;
pcc->handle = device->handle;
pcc->num_sifr = num_sifr;
device->driver_data = pcc;
strcpy(acpi_device_name(device), ACPI_PCC_DEVICE_NAME);
strcpy(acpi_device_class(device), ACPI_PCC_CLASS);
result = acpi_pcc_init_input(pcc);
if (result) {
ACPI_DEBUG_PRINT((ACPI_DB_ERROR,
"Error installing keyinput handler\n"));
goto out_hotkey;
}
if (!acpi_pcc_retrieve_biosdata(pcc, pcc->sinf)) {
ACPI_DEBUG_PRINT((ACPI_DB_ERROR,
"Couldn't retrieve BIOS data\n"));
goto out_input;
}
/* initialize backlight */
memset(&props, 0, sizeof(struct backlight_properties));
props.max_brightness = pcc->sinf[SINF_AC_MAX_BRIGHT];
pcc->backlight = backlight_device_register("panasonic", NULL, pcc,
&pcc_backlight_ops, &props);
if (IS_ERR(pcc->backlight)) {
result = PTR_ERR(pcc->backlight);
goto out_sinf;
}
/* read the initial brightness setting from the hardware */
pcc->backlight->props.brightness = pcc->sinf[SINF_AC_CUR_BRIGHT];
/* read the initial sticky key mode from the hardware */
pcc->sticky_mode = pcc->sinf[SINF_STICKY_KEY];
/* add sysfs attributes */
result = sysfs_create_group(&device->dev.kobj, &pcc_attr_group);
if (result)
goto out_backlight;
return 0;
out_backlight:
backlight_device_unregister(pcc->backlight);
out_sinf:
kfree(pcc->sinf);
out_input:
input_unregister_device(pcc->input_dev);
/* no need to input_free_device() since core input API refcount and
* free()s the device */
out_hotkey:
kfree(pcc);
return result;
}
static int __init acpi_pcc_init(void)
{
int result = 0;
if (acpi_disabled)
return -ENODEV;
result = acpi_bus_register_driver(&acpi_pcc_driver);
if (result < 0) {
ACPI_DEBUG_PRINT((ACPI_DB_ERROR,
"Error registering hotkey driver\n"));
return -ENODEV;
}
return 0;
}
static int acpi_pcc_hotkey_remove(struct acpi_device *device, int type)
{
struct pcc_acpi *pcc = acpi_driver_data(device);
if (!device || !pcc)
return -EINVAL;
sysfs_remove_group(&device->dev.kobj, &pcc_attr_group);
backlight_device_unregister(pcc->backlight);
input_unregister_device(pcc->input_dev);
/* no need to input_free_device() since core input API refcount and
* free()s the device */
kfree(pcc->sinf);
kfree(pcc);
return 0;
}
static void __exit acpi_pcc_exit(void)
{
acpi_bus_unregister_driver(&acpi_pcc_driver);
}
module_init(acpi_pcc_init);
module_exit(acpi_pcc_exit);
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