https://github.com/torvalds/linux
Tip revision: ebf53826e105f488f4f628703a108e98940d1dc5 authored by Linus Torvalds on 01 February 2011, 03:05:49 UTC
Linux 2.6.38-rc3
Linux 2.6.38-rc3
Tip revision: ebf5382
eeepc-wmi.c
/*
* Eee PC WMI hotkey driver
*
* Copyright(C) 2010 Intel Corporation.
* Copyright(C) 2010 Corentin Chary <corentin.chary@gmail.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
*/
#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/leds.h>
#include <linux/rfkill.h>
#include <linux/debugfs.h>
#include <linux/seq_file.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_ACPI_HID "ASUS010" /* old _HID used in eeepc-laptop */
#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
#define EEEPC_WMI_DEVID_TPDLED 0x00100011
#define EEEPC_WMI_DEVID_WLAN 0x00010011
#define EEEPC_WMI_DEVID_BLUETOOTH 0x00010013
#define EEEPC_WMI_DEVID_WWAN3G 0x00010019
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;
};
/*
* eeepc-wmi/ - debugfs root directory
* dev_id - current dev_id
* ctrl_param - current ctrl_param
* devs - call DEVS(dev_id, ctrl_param) and print result
* dsts - call DSTS(dev_id) and print result
*/
struct eeepc_wmi_debug {
struct dentry *root;
u32 dev_id;
u32 ctrl_param;
};
struct eeepc_wmi {
struct input_dev *inputdev;
struct backlight_device *backlight_device;
struct platform_device *platform_device;
struct led_classdev tpd_led;
int tpd_led_wk;
struct workqueue_struct *led_workqueue;
struct work_struct tpd_led_work;
struct rfkill *wlan_rfkill;
struct rfkill *bluetooth_rfkill;
struct rfkill *wwan3g_rfkill;
struct eeepc_wmi_debug debug;
};
/* Only used in eeepc_wmi_init() and eeepc_wmi_exit() */
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 = &eeepc->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 *retval)
{
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 (retval)
*retval = tmp;
kfree(obj);
return status;
}
static acpi_status eeepc_wmi_set_devstate(u32 dev_id, u32 ctrl_param,
u32 *retval)
{
struct bios_args args = {
.dev_id = dev_id,
.ctrl_param = ctrl_param,
};
struct acpi_buffer input = { (acpi_size)sizeof(args), &args };
acpi_status status;
if (!retval) {
status = wmi_evaluate_method(EEEPC_WMI_MGMT_GUID, 1,
EEEPC_WMI_METHODID_DEVS,
&input, NULL);
} else {
struct acpi_buffer output = { ACPI_ALLOCATE_BUFFER, NULL };
union acpi_object *obj;
u32 tmp;
status = wmi_evaluate_method(EEEPC_WMI_MGMT_GUID, 1,
EEEPC_WMI_METHODID_DEVS,
&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;
*retval = tmp;
kfree(obj);
}
return status;
}
/*
* LEDs
*/
/*
* These functions actually update the LED's, and are called from a
* workqueue. By doing this as separate work rather than when the LED
* subsystem asks, we avoid messing with the Eeepc ACPI stuff during a
* potentially bad time, such as a timer interrupt.
*/
static void tpd_led_update(struct work_struct *work)
{
int ctrl_param;
struct eeepc_wmi *eeepc;
eeepc = container_of(work, struct eeepc_wmi, tpd_led_work);
ctrl_param = eeepc->tpd_led_wk;
eeepc_wmi_set_devstate(EEEPC_WMI_DEVID_TPDLED, ctrl_param, NULL);
}
static void tpd_led_set(struct led_classdev *led_cdev,
enum led_brightness value)
{
struct eeepc_wmi *eeepc;
eeepc = container_of(led_cdev, struct eeepc_wmi, tpd_led);
eeepc->tpd_led_wk = !!value;
queue_work(eeepc->led_workqueue, &eeepc->tpd_led_work);
}
static int read_tpd_state(struct eeepc_wmi *eeepc)
{
u32 retval;
acpi_status status;
status = eeepc_wmi_get_devstate(EEEPC_WMI_DEVID_TPDLED, &retval);
if (ACPI_FAILURE(status))
return -1;
else if (!retval || retval == 0x00060000)
/*
* if touchpad led is present, DSTS will set some bits,
* usually 0x00020000.
* 0x00060000 means that the device is not supported
*/
return -ENODEV;
else
/* Status is stored in the first bit */
return retval & 0x1;
}
static enum led_brightness tpd_led_get(struct led_classdev *led_cdev)
{
struct eeepc_wmi *eeepc;
eeepc = container_of(led_cdev, struct eeepc_wmi, tpd_led);
return read_tpd_state(eeepc);
}
static int eeepc_wmi_led_init(struct eeepc_wmi *eeepc)
{
int rv;
if (read_tpd_state(eeepc) < 0)
return 0;
eeepc->led_workqueue = create_singlethread_workqueue("led_workqueue");
if (!eeepc->led_workqueue)
return -ENOMEM;
INIT_WORK(&eeepc->tpd_led_work, tpd_led_update);
eeepc->tpd_led.name = "eeepc::touchpad";
eeepc->tpd_led.brightness_set = tpd_led_set;
eeepc->tpd_led.brightness_get = tpd_led_get;
eeepc->tpd_led.max_brightness = 1;
rv = led_classdev_register(&eeepc->platform_device->dev,
&eeepc->tpd_led);
if (rv) {
destroy_workqueue(eeepc->led_workqueue);
return rv;
}
return 0;
}
static void eeepc_wmi_led_exit(struct eeepc_wmi *eeepc)
{
if (eeepc->tpd_led.dev)
led_classdev_unregister(&eeepc->tpd_led);
if (eeepc->led_workqueue)
destroy_workqueue(eeepc->led_workqueue);
}
/*
* Rfkill devices
*/
static int eeepc_rfkill_set(void *data, bool blocked)
{
int dev_id = (unsigned long)data;
u32 ctrl_param = !blocked;
return eeepc_wmi_set_devstate(dev_id, ctrl_param, NULL);
}
static void eeepc_rfkill_query(struct rfkill *rfkill, void *data)
{
int dev_id = (unsigned long)data;
u32 retval;
acpi_status status;
status = eeepc_wmi_get_devstate(dev_id, &retval);
if (ACPI_FAILURE(status))
return ;
rfkill_set_sw_state(rfkill, !(retval & 0x1));
}
static const struct rfkill_ops eeepc_rfkill_ops = {
.set_block = eeepc_rfkill_set,
.query = eeepc_rfkill_query,
};
static int eeepc_new_rfkill(struct eeepc_wmi *eeepc,
struct rfkill **rfkill,
const char *name,
enum rfkill_type type, int dev_id)
{
int result;
u32 retval;
acpi_status status;
status = eeepc_wmi_get_devstate(dev_id, &retval);
if (ACPI_FAILURE(status))
return -1;
/* If the device is present, DSTS will always set some bits
* 0x00070000 - 1110000000000000000 - device supported
* 0x00060000 - 1100000000000000000 - not supported
* 0x00020000 - 0100000000000000000 - device supported
* 0x00010000 - 0010000000000000000 - not supported / special mode ?
*/
if (!retval || retval == 0x00060000)
return -ENODEV;
*rfkill = rfkill_alloc(name, &eeepc->platform_device->dev, type,
&eeepc_rfkill_ops, (void *)(long)dev_id);
if (!*rfkill)
return -EINVAL;
rfkill_init_sw_state(*rfkill, !(retval & 0x1));
result = rfkill_register(*rfkill);
if (result) {
rfkill_destroy(*rfkill);
*rfkill = NULL;
return result;
}
return 0;
}
static void eeepc_wmi_rfkill_exit(struct eeepc_wmi *eeepc)
{
if (eeepc->wlan_rfkill) {
rfkill_unregister(eeepc->wlan_rfkill);
rfkill_destroy(eeepc->wlan_rfkill);
eeepc->wlan_rfkill = NULL;
}
if (eeepc->bluetooth_rfkill) {
rfkill_unregister(eeepc->bluetooth_rfkill);
rfkill_destroy(eeepc->bluetooth_rfkill);
eeepc->bluetooth_rfkill = NULL;
}
if (eeepc->wwan3g_rfkill) {
rfkill_unregister(eeepc->wwan3g_rfkill);
rfkill_destroy(eeepc->wwan3g_rfkill);
eeepc->wwan3g_rfkill = NULL;
}
}
static int eeepc_wmi_rfkill_init(struct eeepc_wmi *eeepc)
{
int result = 0;
result = eeepc_new_rfkill(eeepc, &eeepc->wlan_rfkill,
"eeepc-wlan", RFKILL_TYPE_WLAN,
EEEPC_WMI_DEVID_WLAN);
if (result && result != -ENODEV)
goto exit;
result = eeepc_new_rfkill(eeepc, &eeepc->bluetooth_rfkill,
"eeepc-bluetooth", RFKILL_TYPE_BLUETOOTH,
EEEPC_WMI_DEVID_BLUETOOTH);
if (result && result != -ENODEV)
goto exit;
result = eeepc_new_rfkill(eeepc, &eeepc->wwan3g_rfkill,
"eeepc-wwan3g", RFKILL_TYPE_WWAN,
EEEPC_WMI_DEVID_WWAN3G);
if (result && result != -ENODEV)
goto exit;
exit:
if (result && result != -ENODEV)
eeepc_wmi_rfkill_exit(eeepc);
if (result == -ENODEV)
result = 0;
return result;
}
/*
* Backlight
*/
static int read_brightness(struct backlight_device *bd)
{
u32 retval;
acpi_status status;
status = eeepc_wmi_get_devstate(EEEPC_WMI_DEVID_BACKLIGHT, &retval);
if (ACPI_FAILURE(status))
return -1;
else
return retval & 0xFF;
}
static int update_bl_status(struct backlight_device *bd)
{
u32 ctrl_param;
acpi_status status;
ctrl_param = bd->props.brightness;
status = eeepc_wmi_set_devstate(EEEPC_WMI_DEVID_BACKLIGHT,
ctrl_param, NULL);
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,
&eeepc->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 ssize_t 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 struct attribute *platform_attributes[] = {
&dev_attr_cpufv.attr,
NULL
};
static struct attribute_group platform_attribute_group = {
.attrs = platform_attributes
};
static void eeepc_wmi_sysfs_exit(struct platform_device *device)
{
sysfs_remove_group(&device->dev.kobj, &platform_attribute_group);
}
static int eeepc_wmi_sysfs_init(struct platform_device *device)
{
return sysfs_create_group(&device->dev.kobj, &platform_attribute_group);
}
/*
* Platform device
*/
static int __init eeepc_wmi_platform_init(struct eeepc_wmi *eeepc)
{
int err;
eeepc->platform_device = platform_device_alloc(EEEPC_WMI_FILE, -1);
if (!eeepc->platform_device)
return -ENOMEM;
platform_set_drvdata(eeepc->platform_device, eeepc);
err = platform_device_add(eeepc->platform_device);
if (err)
goto fail_platform_device;
err = eeepc_wmi_sysfs_init(eeepc->platform_device);
if (err)
goto fail_sysfs;
return 0;
fail_sysfs:
platform_device_del(eeepc->platform_device);
fail_platform_device:
platform_device_put(eeepc->platform_device);
return err;
}
static void eeepc_wmi_platform_exit(struct eeepc_wmi *eeepc)
{
eeepc_wmi_sysfs_exit(eeepc->platform_device);
platform_device_unregister(eeepc->platform_device);
}
/*
* debugfs
*/
struct eeepc_wmi_debugfs_node {
struct eeepc_wmi *eeepc;
char *name;
int (*show)(struct seq_file *m, void *data);
};
static int show_dsts(struct seq_file *m, void *data)
{
struct eeepc_wmi *eeepc = m->private;
acpi_status status;
u32 retval = -1;
status = eeepc_wmi_get_devstate(eeepc->debug.dev_id, &retval);
if (ACPI_FAILURE(status))
return -EIO;
seq_printf(m, "DSTS(%x) = %x\n", eeepc->debug.dev_id, retval);
return 0;
}
static int show_devs(struct seq_file *m, void *data)
{
struct eeepc_wmi *eeepc = m->private;
acpi_status status;
u32 retval = -1;
status = eeepc_wmi_set_devstate(eeepc->debug.dev_id,
eeepc->debug.ctrl_param, &retval);
if (ACPI_FAILURE(status))
return -EIO;
seq_printf(m, "DEVS(%x, %x) = %x\n", eeepc->debug.dev_id,
eeepc->debug.ctrl_param, retval);
return 0;
}
static struct eeepc_wmi_debugfs_node eeepc_wmi_debug_files[] = {
{ NULL, "devs", show_devs },
{ NULL, "dsts", show_dsts },
};
static int eeepc_wmi_debugfs_open(struct inode *inode, struct file *file)
{
struct eeepc_wmi_debugfs_node *node = inode->i_private;
return single_open(file, node->show, node->eeepc);
}
static const struct file_operations eeepc_wmi_debugfs_io_ops = {
.owner = THIS_MODULE,
.open = eeepc_wmi_debugfs_open,
.read = seq_read,
.llseek = seq_lseek,
.release = single_release,
};
static void eeepc_wmi_debugfs_exit(struct eeepc_wmi *eeepc)
{
debugfs_remove_recursive(eeepc->debug.root);
}
static int eeepc_wmi_debugfs_init(struct eeepc_wmi *eeepc)
{
struct dentry *dent;
int i;
eeepc->debug.root = debugfs_create_dir(EEEPC_WMI_FILE, NULL);
if (!eeepc->debug.root) {
pr_err("failed to create debugfs directory");
goto error_debugfs;
}
dent = debugfs_create_x32("dev_id", S_IRUGO|S_IWUSR,
eeepc->debug.root, &eeepc->debug.dev_id);
if (!dent)
goto error_debugfs;
dent = debugfs_create_x32("ctrl_param", S_IRUGO|S_IWUSR,
eeepc->debug.root, &eeepc->debug.ctrl_param);
if (!dent)
goto error_debugfs;
for (i = 0; i < ARRAY_SIZE(eeepc_wmi_debug_files); i++) {
struct eeepc_wmi_debugfs_node *node = &eeepc_wmi_debug_files[i];
node->eeepc = eeepc;
dent = debugfs_create_file(node->name, S_IFREG | S_IRUGO,
eeepc->debug.root, node,
&eeepc_wmi_debugfs_io_ops);
if (!dent) {
pr_err("failed to create debug file: %s\n", node->name);
goto error_debugfs;
}
}
return 0;
error_debugfs:
eeepc_wmi_debugfs_exit(eeepc);
return -ENOMEM;
}
/*
* WMI Driver
*/
static struct platform_device * __init eeepc_wmi_add(void)
{
struct eeepc_wmi *eeepc;
acpi_status status;
int err;
eeepc = kzalloc(sizeof(struct eeepc_wmi), GFP_KERNEL);
if (!eeepc)
return ERR_PTR(-ENOMEM);
/*
* Register the platform device first. It is used as a parent for the
* sub-devices below.
*/
err = eeepc_wmi_platform_init(eeepc);
if (err)
goto fail_platform;
err = eeepc_wmi_input_init(eeepc);
if (err)
goto fail_input;
err = eeepc_wmi_led_init(eeepc);
if (err)
goto fail_leds;
err = eeepc_wmi_rfkill_init(eeepc);
if (err)
goto fail_rfkill;
if (!acpi_video_backlight_support()) {
err = eeepc_wmi_backlight_init(eeepc);
if (err)
goto fail_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 fail_wmi_handler;
}
err = eeepc_wmi_debugfs_init(eeepc);
if (err)
goto fail_debugfs;
return eeepc->platform_device;
fail_debugfs:
wmi_remove_notify_handler(EEEPC_WMI_EVENT_GUID);
fail_wmi_handler:
eeepc_wmi_backlight_exit(eeepc);
fail_backlight:
eeepc_wmi_rfkill_exit(eeepc);
fail_rfkill:
eeepc_wmi_led_exit(eeepc);
fail_leds:
eeepc_wmi_input_exit(eeepc);
fail_input:
eeepc_wmi_platform_exit(eeepc);
fail_platform:
kfree(eeepc);
return ERR_PTR(err);
}
static int eeepc_wmi_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);
eeepc_wmi_led_exit(eeepc);
eeepc_wmi_rfkill_exit(eeepc);
eeepc_wmi_debugfs_exit(eeepc);
eeepc_wmi_platform_exit(eeepc);
kfree(eeepc);
return 0;
}
static struct platform_driver platform_driver = {
.driver = {
.name = EEEPC_WMI_FILE,
.owner = THIS_MODULE,
},
};
static acpi_status __init eeepc_wmi_parse_device(acpi_handle handle, u32 level,
void *context, void **retval)
{
pr_warning("Found legacy ATKD device (%s)", EEEPC_ACPI_HID);
*(bool *)context = true;
return AE_CTRL_TERMINATE;
}
static int __init eeepc_wmi_check_atkd(void)
{
acpi_status status;
bool found = false;
status = acpi_get_devices(EEEPC_ACPI_HID, eeepc_wmi_parse_device,
&found, NULL);
if (ACPI_FAILURE(status) || !found)
return 0;
return -1;
}
static int __init eeepc_wmi_init(void)
{
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;
}
if (eeepc_wmi_check_atkd()) {
pr_warning("WMI device present, but legacy ATKD device is also "
"present and enabled.");
pr_warning("You probably booted with acpi_osi=\"Linux\" or "
"acpi_osi=\"!Windows 2009\"");
pr_warning("Can't load eeepc-wmi, use default acpi_osi "
"(preferred) or eeepc-laptop");
return -ENODEV;
}
platform_device = eeepc_wmi_add();
if (IS_ERR(platform_device)) {
err = PTR_ERR(platform_device);
goto fail_eeepc_wmi;
}
err = platform_driver_register(&platform_driver);
if (err) {
pr_warning("Unable to register platform driver\n");
goto fail_platform_driver;
}
return 0;
fail_platform_driver:
eeepc_wmi_remove(platform_device);
fail_eeepc_wmi:
return err;
}
static void __exit eeepc_wmi_exit(void)
{
eeepc_wmi_remove(platform_device);
platform_driver_unregister(&platform_driver);
}
module_init(eeepc_wmi_init);
module_exit(eeepc_wmi_exit);