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platform/x86: Add LG Gram laptop special features driver

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A driver for LG Gram laptop supporting features not available through the
standard interfaces:

- Support for the 5 Fn keys that generate ACPI or WMI events.

- Two software controlled LEDs: keyboard backlight (also controlled by
  hardware) and touchpad LED.

- Extra features: reader mode, Fn lock, cooling mode, USB charge mode, and
  maximal battery charging level.

Signed-off-by: Matan Ziv-Av <matan@svgalib.org>
Signed-off-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
This commit is contained in:
Matan Ziv-Av 2018-09-28 17:34:06 +03:00 committed by Andy Shevchenko
parent 9fe44fc98c
commit dbf0c5a6b1
6 changed files with 839 additions and 0 deletions
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35
Documentation/ABI/testing/sysfs-platform-lg-laptop Normal file
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@ -0,0 +1,35 @@
What: /sys/devices/platform/lg-laptop/reader_mode
Date: October 2018
KernelVersion: 4.20
Contact: "Matan Ziv-Av <matan@svgalib.org>
Description:
Control reader mode. 1 means on, 0 means off.
What: /sys/devices/platform/lg-laptop/fn_lock
Date: October 2018
KernelVersion: 4.20
Contact: "Matan Ziv-Av <matan@svgalib.org>
Description:
Control FN lock mode. 1 means on, 0 means off.
What: /sys/devices/platform/lg-laptop/battery_care_limit
Date: October 2018
KernelVersion: 4.20
Contact: "Matan Ziv-Av <matan@svgalib.org>
Description:
Maximal battery charge level. Accepted values are 80 or 100.
What: /sys/devices/platform/lg-laptop/fan_mode
Date: October 2018
KernelVersion: 4.20
Contact: "Matan Ziv-Av <matan@svgalib.org>
Description:
Control fan mode. 1 for performance mode, 0 for silent mode.
What: /sys/devices/platform/lg-laptop/usb_charge
Date: October 2018
KernelVersion: 4.20
Contact: "Matan Ziv-Av <matan@svgalib.org>
Description:
Control USB port charging when device is turned off.
1 means on, 0 means off.

81
Documentation/laptops/lg-laptop.rst Normal file
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@ -0,0 +1,81 @@
.. SPDX-License-Identifier: GPL-2.0+
LG Gram laptop extra features
=============================
By Matan Ziv-Av <matan@svgalib.org>
Hotkeys
-------
The following FN keys are ignored by the kernel without this driver:
- FN-F1 (LG control panel) - Generates F15
- FN-F5 (Touchpad toggle) - Generates F13
- FN-F6 (Airplane mode) - Generates RFKILL
- FN-F8 (Keyboard backlight) - Generates F16.
This key also changes keyboard backlight mode.
- FN-F9 (Reader mode) - Generates F14
The rest of the FN key work without a need for a special driver.
Reader mode
-----------
Writing 0/1 to /sys/devices/platform/lg-laptop/reader_mode disables/enables
reader mode. In this mode the screen colors change (blue color reduced),
and the reader mode indicator LED (on F9 key) turns on.
FN Lock
-------
Writing 0/1 to /sys/devices/platform/lg-laptop/fn_lock disables/enables
FN lock.
Battery care limit
------------------
Writing 80/100 to /sys/devices/platform/lg-laptop/battery_care_limit
sets the maximum capacity to charge the battery. Limiting the charge
reduces battery capacity loss over time.
This value is reset to 100 when the kernel boots.
Fan mode
--------
Writing 1/0 to /sys/devices/platform/lg-laptop/fan_mode disables/enables
the fan silent mode.
USB charge
----------
Writing 0/1 to /sys/devices/platform/lg-laptop/usb_charge disables/enables
charging another device from the USB port while the device is turned off.
This value is reset to 0 when the kernel boots.
LEDs
~~~~
The are two LED devices supported by the driver:
Keyboard backlight
------------------
A led device named kbd_led controls the keyboard backlight. There are three
lighting level: off (0), low (127) and high (255).
The keyboard backlight is also controlled by the key combination FN-F8
which cycles through those levels.
Touchpad indicator LED
----------------------
On the F5 key. Controlled by led device names tpad_led.

8
MAINTAINERS
View File

@ -8231,6 +8231,14 @@ W: http://legousb.sourceforge.net/
S: Maintained
F: drivers/usb/misc/legousbtower.c
LG LAPTOP EXTRAS
M: Matan Ziv-Av <matan@svgalib.org>
L: platform-driver-x86@vger.kernel.org
S: Maintained
F: Documentation/ABI/testing/sysfs-platform-lg-laptop
F: Documentation/laptops/lg-laptop.rst
F: drivers/platform/x86/lg-laptop.c
LG2160 MEDIA DRIVER
M: Michael Krufky <mkrufky@linuxtv.org>
L: linux-media@vger.kernel.org

14
drivers/platform/x86/Kconfig
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@ -367,6 +367,20 @@ config HP_WMI
To compile this driver as a module, choose M here: the module will
be called hp-wmi.
config LG_LAPTOP
tristate "LG Laptop Extras"
depends on ACPI
depends on ACPI_WMI
depends on INPUT
select INPUT_SPARSEKMAP
select LEDS_CLASS
help
This driver adds support for hotkeys as well as control of keyboard
backlight, battery maximum charge level and various other ACPI
features.
If you have an LG Gram laptop, say Y or M here.
config MSI_LAPTOP
tristate "MSI Laptop Extras"
depends on ACPI

1
drivers/platform/x86/Makefile
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@ -9,6 +9,7 @@ obj-$(CONFIG_ASUS_NB_WMI) += asus-nb-wmi.o
obj-$(CONFIG_ASUS_WIRELESS) += asus-wireless.o
obj-$(CONFIG_EEEPC_LAPTOP) += eeepc-laptop.o
obj-$(CONFIG_EEEPC_WMI) += eeepc-wmi.o
obj-$(CONFIG_LG_LAPTOP) += lg-laptop.o
obj-$(CONFIG_MSI_LAPTOP) += msi-laptop.o
obj-$(CONFIG_ACPI_CMPC) += classmate-laptop.o
obj-$(CONFIG_COMPAL_LAPTOP) += compal-laptop.o

700
drivers/platform/x86/lg-laptop.c Normal file
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@ -0,0 +1,700 @@
// SPDX-License-Identifier: GPL-2.0+
/*
* lg-laptop.c - LG Gram ACPI features and hotkeys Driver
*
* Copyright (C) 2018 Matan Ziv-Av <matan@svgalib.org>
*/
#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
#include <linux/acpi.h>
#include <linux/input.h>
#include <linux/input/sparse-keymap.h>
#include <linux/kernel.h>
#include <linux/leds.h>
#include <linux/module.h>
#include <linux/platform_device.h>
#include <linux/types.h>
#define LED_DEVICE(_name, max) struct led_classdev _name = { \
.name = __stringify(_name), \
.max_brightness = max, \
.brightness_set = _name##_set, \
.brightness_get = _name##_get, \
}
MODULE_AUTHOR("Matan Ziv-Av");
MODULE_DESCRIPTION("LG WMI Hotkey Driver");
MODULE_LICENSE("GPL");
#define WMI_EVENT_GUID0 "E4FB94F9-7F2B-4173-AD1A-CD1D95086248"
#define WMI_EVENT_GUID1 "023B133E-49D1-4E10-B313-698220140DC2"
#define WMI_EVENT_GUID2 "37BE1AC0-C3F2-4B1F-BFBE-8FDEAF2814D6"
#define WMI_EVENT_GUID3 "911BAD44-7DF8-4FBB-9319-BABA1C4B293B"
#define WMI_METHOD_WMAB "C3A72B38-D3EF-42D3-8CBB-D5A57049F66D"
#define WMI_METHOD_WMBB "2B4F501A-BD3C-4394-8DCF-00A7D2BC8210"
#define WMI_EVENT_GUID WMI_EVENT_GUID0
#define WMAB_METHOD "\\XINI.WMAB"
#define WMBB_METHOD "\\XINI.WMBB"
#define SB_GGOV_METHOD "\\_SB.GGOV"
#define GOV_TLED 0x2020008
#define WM_GET 1
#define WM_SET 2
#define WM_KEY_LIGHT 0x400
#define WM_TLED 0x404
#define WM_FN_LOCK 0x407
#define WM_BATT_LIMIT 0x61
#define WM_READER_MODE 0xBF
#define WM_FAN_MODE 0x33
#define WMBB_USB_CHARGE 0x10B
#define WMBB_BATT_LIMIT 0x10C
#define PLATFORM_NAME "lg-laptop"
MODULE_ALIAS("wmi:" WMI_EVENT_GUID0);
MODULE_ALIAS("wmi:" WMI_EVENT_GUID1);
MODULE_ALIAS("wmi:" WMI_EVENT_GUID2);
MODULE_ALIAS("wmi:" WMI_EVENT_GUID3);
MODULE_ALIAS("wmi:" WMI_METHOD_WMAB);
MODULE_ALIAS("wmi:" WMI_METHOD_WMBB);
MODULE_ALIAS("acpi*:LGEX0815:*");
static struct platform_device *pf_device;
static struct input_dev *wmi_input_dev;
static u32 inited;
#define INIT_INPUT_WMI_0 0x01
#define INIT_INPUT_WMI_2 0x02
#define INIT_INPUT_ACPI 0x04
#define INIT_TPAD_LED 0x08
#define INIT_KBD_LED 0x10
#define INIT_SPARSE_KEYMAP 0x80
static const struct key_entry wmi_keymap[] = {
{KE_KEY, 0x70, {KEY_F15} }, /* LG control panel (F1) */
{KE_KEY, 0x74, {KEY_F13} }, /* Touchpad toggle (F5) */
{KE_KEY, 0xf020000, {KEY_F14} }, /* Read mode (F9) */
{KE_KEY, 0x10000000, {KEY_F16} },/* Keyboard backlight (F8) - pressing
* this key both sends an event and
* changes backlight level.
*/
{KE_KEY, 0x80, {KEY_RFKILL} },
{KE_END, 0}
};
static int ggov(u32 arg0)
{
union acpi_object args[1];
union acpi_object *r;
acpi_status status;
acpi_handle handle;
struct acpi_object_list arg;
struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
int res;
args[0].type = ACPI_TYPE_INTEGER;
args[0].integer.value = arg0;
status = acpi_get_handle(NULL, (acpi_string) SB_GGOV_METHOD, &handle);
if (ACPI_FAILURE(status)) {
pr_err("Cannot get handle");
return -ENODEV;
}
arg.count = 1;
arg.pointer = args;
status = acpi_evaluate_object(handle, NULL, &arg, &buffer);
if (ACPI_FAILURE(status)) {
acpi_handle_err(handle, "GGOV: call failed.\n");
return -EINVAL;
}
r = buffer.pointer;
if (r->type != ACPI_TYPE_INTEGER) {
kfree(r);
return -EINVAL;
}
res = r->integer.value;
kfree(r);
return res;
}
static union acpi_object *lg_wmab(u32 method, u32 arg1, u32 arg2)
{
union acpi_object args[3];
acpi_status status;
acpi_handle handle;
struct acpi_object_list arg;
struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
args[0].type = ACPI_TYPE_INTEGER;
args[0].integer.value = method;
args[1].type = ACPI_TYPE_INTEGER;
args[1].integer.value = arg1;
args[2].type = ACPI_TYPE_INTEGER;
args[2].integer.value = arg2;
status = acpi_get_handle(NULL, (acpi_string) WMAB_METHOD, &handle);
if (ACPI_FAILURE(status)) {
pr_err("Cannot get handle");
return NULL;
}
arg.count = 3;
arg.pointer = args;
status = acpi_evaluate_object(handle, NULL, &arg, &buffer);
if (ACPI_FAILURE(status)) {
acpi_handle_err(handle, "WMAB: call failed.\n");
return NULL;
}
return buffer.pointer;
}
static union acpi_object *lg_wmbb(u32 method_id, u32 arg1, u32 arg2)
{
union acpi_object args[3];
acpi_status status;
acpi_handle handle;
struct acpi_object_list arg;
struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
u8 buf[32];
*(u32 *)buf = method_id;
*(u32 *)(buf + 4) = arg1;
*(u32 *)(buf + 16) = arg2;
args[0].type = ACPI_TYPE_INTEGER;
args[0].integer.value = 0; /* ignored */
args[1].type = ACPI_TYPE_INTEGER;
args[1].integer.value = 1; /* Must be 1 or 2. Does not matter which */
args[2].type = ACPI_TYPE_BUFFER;
args[2].buffer.length = 32;
args[2].buffer.pointer = buf;
status = acpi_get_handle(NULL, (acpi_string)WMBB_METHOD, &handle);
if (ACPI_FAILURE(status)) {
pr_err("Cannot get handle");
return NULL;
}
arg.count = 3;
arg.pointer = args;
status = acpi_evaluate_object(handle, NULL, &arg, &buffer);
if (ACPI_FAILURE(status)) {
acpi_handle_err(handle, "WMAB: call failed.\n");
return NULL;
}
return (union acpi_object *)buffer.pointer;
}
static void wmi_notify(u32 value, void *context)
{
struct acpi_buffer response = { ACPI_ALLOCATE_BUFFER, NULL };
union acpi_object *obj;
acpi_status status;
long data = (long)context;
pr_debug("event guid %li\n", data);
status = wmi_get_event_data(value, &response);
if (ACPI_FAILURE(status)) {
pr_err("Bad event status 0x%x\n", status);
return;
}
obj = (union acpi_object *)response.pointer;
if (!obj)
return;
if (obj->type == ACPI_TYPE_INTEGER) {
int eventcode = obj->integer.value;
struct key_entry *key;
key =
sparse_keymap_entry_from_scancode(wmi_input_dev, eventcode);
if (key && key->type == KE_KEY)
sparse_keymap_report_entry(wmi_input_dev, key, 1, true);
}
pr_debug("Type: %i Eventcode: 0x%llx\n", obj->type,
obj->integer.value);
kfree(response.pointer);
}
static void wmi_input_setup(void)
{
acpi_status status;
wmi_input_dev = input_allocate_device();
if (wmi_input_dev) {
wmi_input_dev->name = "LG WMI hotkeys";
wmi_input_dev->phys = "wmi/input0";
wmi_input_dev->id.bustype = BUS_HOST;
if (sparse_keymap_setup(wmi_input_dev, wmi_keymap, NULL) ||
input_register_device(wmi_input_dev)) {
pr_info("Cannot initialize input device");
input_free_device(wmi_input_dev);
return;
}
inited |= INIT_SPARSE_KEYMAP;
status = wmi_install_notify_handler(WMI_EVENT_GUID0, wmi_notify,
(void *)0);
if (ACPI_SUCCESS(status))
inited |= INIT_INPUT_WMI_0;
status = wmi_install_notify_handler(WMI_EVENT_GUID2, wmi_notify,
(void *)2);
if (ACPI_SUCCESS(status))
inited |= INIT_INPUT_WMI_2;
} else {
pr_info("Cannot allocate input device");
}
}
static void acpi_notify(struct acpi_device *device, u32 event)
{
struct key_entry *key;
acpi_handle_debug(device->handle, "notify: %d\n", event);
if (inited & INIT_SPARSE_KEYMAP) {
key = sparse_keymap_entry_from_scancode(wmi_input_dev, 0x80);
if (key && key->type == KE_KEY)
sparse_keymap_report_entry(wmi_input_dev, key, 1, true);
}
}
static ssize_t fan_mode_store(struct device *dev,
struct device_attribute *attr,
const char *buffer, size_t count)
{
bool value;
union acpi_object *r;
u32 m;
int ret;
ret = kstrtobool(buffer, &value);
if (ret)
return ret;
r = lg_wmab(WM_FAN_MODE, WM_GET, 0);
if (!r)
return -EIO;
if (r->type != ACPI_TYPE_INTEGER) {
kfree(r);
return -EIO;
}
m = r->integer.value;
kfree(r);
r = lg_wmab(WM_FAN_MODE, WM_SET, (m & 0xffffff0f) | (value << 4));
kfree(r);
r = lg_wmab(WM_FAN_MODE, WM_SET, (m & 0xfffffff0) | value);
kfree(r);
return count;
}
static ssize_t fan_mode_show(struct device *dev,
struct device_attribute *attr, char *buffer)
{
unsigned int status;
union acpi_object *r;
r = lg_wmab(WM_FAN_MODE, WM_GET, 0);
if (!r)
return -EIO;
if (r->type != ACPI_TYPE_INTEGER) {
kfree(r);
return -EIO;
}
status = r->integer.value & 0x01;
kfree(r);
return snprintf(buffer, PAGE_SIZE, "%d\n", status);
}
static ssize_t usb_charge_store(struct device *dev,
struct device_attribute *attr,
const char *buffer, size_t count)
{
bool value;
union acpi_object *r;
int ret;
ret = kstrtobool(buffer, &value);
if (ret)
return ret;
r = lg_wmbb(WMBB_USB_CHARGE, WM_SET, value);
if (!r)
return -EIO;
kfree(r);
return count;
}
static ssize_t usb_charge_show(struct device *dev,
struct device_attribute *attr, char *buffer)
{
unsigned int status;
union acpi_object *r;
r = lg_wmbb(WMBB_USB_CHARGE, WM_GET, 0);
if (!r)
return -EIO;
if (r->type != ACPI_TYPE_BUFFER) {
kfree(r);
return -EIO;
}
status = !!r->buffer.pointer[0x10];
kfree(r);
return snprintf(buffer, PAGE_SIZE, "%d\n", status);
}
static ssize_t reader_mode_store(struct device *dev,
struct device_attribute *attr,
const char *buffer, size_t count)
{
bool value;
union acpi_object *r;
int ret;
ret = kstrtobool(buffer, &value);
if (ret)
return ret;
r = lg_wmab(WM_READER_MODE, WM_SET, value);
if (!r)
return -EIO;
kfree(r);
return count;
}
static ssize_t reader_mode_show(struct device *dev,
struct device_attribute *attr, char *buffer)
{
unsigned int status;
union acpi_object *r;
r = lg_wmab(WM_READER_MODE, WM_GET, 0);
if (!r)
return -EIO;
if (r->type != ACPI_TYPE_INTEGER) {
kfree(r);
return -EIO;
}
status = !!r->integer.value;
kfree(r);
return snprintf(buffer, PAGE_SIZE, "%d\n", status);
}
static ssize_t fn_lock_store(struct device *dev,
struct device_attribute *attr,
const char *buffer, size_t count)
{
bool value;
union acpi_object *r;
int ret;
ret = kstrtobool(buffer, &value);
if (ret)
return ret;
r = lg_wmab(WM_FN_LOCK, WM_SET, value);
if (!r)
return -EIO;
kfree(r);
return count;
}
static ssize_t fn_lock_show(struct device *dev,
struct device_attribute *attr, char *buffer)
{
unsigned int status;
union acpi_object *r;
r = lg_wmab(WM_FN_LOCK, WM_GET, 0);
if (!r)
return -EIO;
if (r->type != ACPI_TYPE_BUFFER) {
kfree(r);
return -EIO;
}
status = !!r->buffer.pointer[0];
kfree(r);
return snprintf(buffer, PAGE_SIZE, "%d\n", status);
}
static ssize_t battery_care_limit_store(struct device *dev,
struct device_attribute *attr,
const char *buffer, size_t count)
{
unsigned long value;
int ret;
ret = kstrtoul(buffer, 10, &value);
if (ret)
return ret;
if (value == 100 || value == 80) {
union acpi_object *r;
r = lg_wmab(WM_BATT_LIMIT, WM_SET, value);
if (!r)
return -EIO;
kfree(r);
return count;
}
return -EINVAL;
}
static ssize_t battery_care_limit_show(struct device *dev,
struct device_attribute *attr,
char *buffer)
{
unsigned int status;
union acpi_object *r;
r = lg_wmab(WM_BATT_LIMIT, WM_GET, 0);
if (!r)
return -EIO;
if (r->type != ACPI_TYPE_INTEGER) {
kfree(r);
return -EIO;
}
status = r->integer.value;
kfree(r);
if (status != 80 && status != 100)
status = 0;
return snprintf(buffer, PAGE_SIZE, "%d\n", status);
}
static DEVICE_ATTR_RW(fan_mode);
static DEVICE_ATTR_RW(usb_charge);
static DEVICE_ATTR_RW(reader_mode);
static DEVICE_ATTR_RW(fn_lock);
static DEVICE_ATTR_RW(battery_care_limit);
static struct attribute *dev_attributes[] = {
&dev_attr_fan_mode.attr,
&dev_attr_usb_charge.attr,
&dev_attr_reader_mode.attr,
&dev_attr_fn_lock.attr,
&dev_attr_battery_care_limit.attr,
NULL
};
static const struct attribute_group dev_attribute_group = {
.attrs = dev_attributes,
};
static void tpad_led_set(struct led_classdev *cdev,
enum led_brightness brightness)
{
union acpi_object *r;
r = lg_wmab(WM_TLED, WM_SET, brightness > LED_OFF);
kfree(r);
}
static enum led_brightness tpad_led_get(struct led_classdev *cdev)
{
return ggov(GOV_TLED) > 0 ? LED_ON : LED_OFF;
}
static LED_DEVICE(tpad_led, 1);
static void kbd_backlight_set(struct led_classdev *cdev,
enum led_brightness brightness)
{
u32 val;
union acpi_object *r;
val = 0x22;
if (brightness <= LED_OFF)
val = 0;
if (brightness >= LED_FULL)
val = 0x24;
r = lg_wmab(WM_KEY_LIGHT, WM_SET, val);
kfree(r);
}
static enum led_brightness kbd_backlight_get(struct led_classdev *cdev)
{
union acpi_object *r;
int val;
r = lg_wmab(WM_KEY_LIGHT, WM_GET, 0);
if (!r)
return LED_OFF;
if (r->type != ACPI_TYPE_BUFFER || r->buffer.pointer[1] != 0x05) {
kfree(r);
return LED_OFF;
}
switch (r->buffer.pointer[0] & 0x27) {
case 0x24:
val = LED_FULL;
break;
case 0x22:
val = LED_HALF;
break;
default:
val = LED_OFF;
}
kfree(r);
return val;
}
static LED_DEVICE(kbd_backlight, 255);
static void wmi_input_destroy(void)
{
if (inited & INIT_INPUT_WMI_2)
wmi_remove_notify_handler(WMI_EVENT_GUID2);
if (inited & INIT_INPUT_WMI_0)
wmi_remove_notify_handler(WMI_EVENT_GUID0);
if (inited & INIT_SPARSE_KEYMAP)
input_unregister_device(wmi_input_dev);
inited &= ~(INIT_INPUT_WMI_0 | INIT_INPUT_WMI_2 | INIT_SPARSE_KEYMAP);
}
static struct platform_driver pf_driver = {
.driver = {
.name = PLATFORM_NAME,
}
};
static int acpi_add(struct acpi_device *device)
{
int ret;
if (pf_device)
return 0;
ret = platform_driver_register(&pf_driver);
if (ret)
return ret;
pf_device = platform_device_register_simple(PLATFORM_NAME,
PLATFORM_DEVID_NONE,
NULL, 0);
if (IS_ERR(pf_device)) {
ret = PTR_ERR(pf_device);
pf_device = NULL;
pr_err("unable to register platform device\n");
goto out_platform_registered;
}
ret = sysfs_create_group(&pf_device->dev.kobj, &dev_attribute_group);
if (ret)
goto out_platform_device;
if (!led_classdev_register(&pf_device->dev, &kbd_backlight))
inited |= INIT_KBD_LED;
if (!led_classdev_register(&pf_device->dev, &tpad_led))
inited |= INIT_TPAD_LED;
wmi_input_setup();
return 0;
out_platform_device:
platform_device_unregister(pf_device);
out_platform_registered:
platform_driver_unregister(&pf_driver);
return ret;
}
static int acpi_remove(struct acpi_device *device)
{
sysfs_remove_group(&pf_device->dev.kobj, &dev_attribute_group);
if (inited & INIT_KBD_LED)
led_classdev_unregister(&kbd_backlight);
if (inited & INIT_TPAD_LED)
led_classdev_unregister(&tpad_led);
wmi_input_destroy();
platform_device_unregister(pf_device);
pf_device = NULL;
platform_driver_unregister(&pf_driver);
return 0;
}
static const struct acpi_device_id device_ids[] = {
{"LGEX0815", 0},
{"", 0}
};
MODULE_DEVICE_TABLE(acpi, device_ids);
static struct acpi_driver acpi_driver = {
.name = "LG Gram Laptop Support",
.class = "lg-laptop",
.ids = device_ids,
.ops = {
.add = acpi_add,
.remove = acpi_remove,
.notify = acpi_notify,
},
.owner = THIS_MODULE,
};
static int __init acpi_init(void)
{
int result;
result = acpi_bus_register_driver(&acpi_driver);
if (result < 0) {
ACPI_DEBUG_PRINT((ACPI_DB_ERROR, "Error registering driver\n"));
return -ENODEV;
}
return 0;
}
static void __exit acpi_exit(void)
{
acpi_bus_unregister_driver(&acpi_driver);
}
module_init(acpi_init);
module_exit(acpi_exit);