drivers/platform/x86/ideapad-laptop.c - maze/linux - Git at Google

 /*
  *  ideapad_acpi.c - Lenovo IdeaPad ACPI Extras
  *
  *  Copyright © 2010 Intel Corporation
  *  Copyright © 2010 David Woodhouse <dwmw2@infradead.org>
  *
  *  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., 51 Franklin Street, Fifth Floor, Boston, MA
  *  02110-1301, USA.
  */

 #include <linux/kernel.h>
 #include <linux/module.h>
 #include <linux/init.h>
 #include <linux/types.h>
 #include <acpi/acpi_bus.h>
 #include <acpi/acpi_drivers.h>
 #include <linux/rfkill.h>

 #define IDEAPAD_DEV_CAMERA	0
 #define IDEAPAD_DEV_WLAN	1
 #define IDEAPAD_DEV_BLUETOOTH	2
 #define IDEAPAD_DEV_3G		3
 #define IDEAPAD_DEV_KILLSW	4

 struct ideapad_private {
 	acpi_handle handle;
 	struct rfkill *rfk[5];
 } *ideapad_priv;

 static struct {
 	char *name;
 	int cfgbit;
 	int opcode;
 	int type;
 } ideapad_rfk_data[] = {
 	{ "ideapad_camera",	19, 0x1E, NUM_RFKILL_TYPES },
 	{ "ideapad_wlan",	18, 0x15, RFKILL_TYPE_WLAN },
 	{ "ideapad_bluetooth",	16, 0x17, RFKILL_TYPE_BLUETOOTH },
 	{ "ideapad_3g",		17, 0x20, RFKILL_TYPE_WWAN },
 	{ "ideapad_killsw",	0,  0,    RFKILL_TYPE_WLAN }
 };

 static bool no_bt_rfkill;
 module_param(no_bt_rfkill, bool, 0444);
 MODULE_PARM_DESC(no_bt_rfkill, "No rfkill for bluetooth.");

 /*
  * ACPI Helpers
  */
 #define IDEAPAD_EC_TIMEOUT (100) /* in ms */

 static int read_method_int(acpi_handle handle, const char *method, int *val)
 {
 	acpi_status status;
 	unsigned long long result;

 	status = acpi_evaluate_integer(handle, (char *)method, NULL, &result);
 	if (ACPI_FAILURE(status)) {
 		*val = -1;
 		return -1;
 	} else {
 		*val = result;
 		return 0;
 	}
 }

 static int method_vpcr(acpi_handle handle, int cmd, int *ret)
 {
 	acpi_status status;
 	unsigned long long result;
 	struct acpi_object_list params;
 	union acpi_object in_obj;

 	params.count = 1;
 	params.pointer = &in_obj;
 	in_obj.type = ACPI_TYPE_INTEGER;
 	in_obj.integer.value = cmd;

 	status = acpi_evaluate_integer(handle, "VPCR", &params, &result);

 	if (ACPI_FAILURE(status)) {
 		*ret = -1;
 		return -1;
 	} else {
 		*ret = result;
 		return 0;
 	}
 }

 static int method_vpcw(acpi_handle handle, int cmd, int data)
 {
 	struct acpi_object_list params;
 	union acpi_object in_obj[2];
 	acpi_status status;

 	params.count = 2;
 	params.pointer = in_obj;
 	in_obj[0].type = ACPI_TYPE_INTEGER;
 	in_obj[0].integer.value = cmd;
 	in_obj[1].type = ACPI_TYPE_INTEGER;
 	in_obj[1].integer.value = data;

 	status = acpi_evaluate_object(handle, "VPCW", &params, NULL);
 	if (status != AE_OK)
 		return -1;
 	return 0;
 }

 static int read_ec_data(acpi_handle handle, int cmd, unsigned long *data)
 {
 	int val;
 	unsigned long int end_jiffies;

 	if (method_vpcw(handle, 1, cmd))
 		return -1;

 	for (end_jiffies = jiffies+(HZ)*IDEAPAD_EC_TIMEOUT/1000+1;
 	     time_before(jiffies, end_jiffies);) {
 		schedule();
 		if (method_vpcr(handle, 1, &val))
 			return -1;
 		if (val == 0) {
 			if (method_vpcr(handle, 0, &val))
 				return -1;
 			*data = val;
 			return 0;
 		}
 	}
 	pr_err("timeout in read_ec_cmd\n");
 	return -1;
 }

 static int write_ec_cmd(acpi_handle handle, int cmd, unsigned long data)
 {
 	int val;
 	unsigned long int end_jiffies;

 	if (method_vpcw(handle, 0, data))
 		return -1;
 	if (method_vpcw(handle, 1, cmd))
 		return -1;

 	for (end_jiffies = jiffies+(HZ)*IDEAPAD_EC_TIMEOUT/1000+1;
 	     time_before(jiffies, end_jiffies);) {
 		schedule();
 		if (method_vpcr(handle, 1, &val))
 			return -1;
 		if (val == 0)
 			return 0;
 	}
 	pr_err("timeout in write_ec_cmd\n");
 	return -1;
 }
 /* the above is ACPI helpers */

 static ssize_t show_ideapad_cam(struct device *dev,
 				struct device_attribute *attr,
 				char *buf)
 {
 	struct ideapad_private *priv = dev_get_drvdata(dev);
 	acpi_handle handle = priv->handle;
 	unsigned long result;

 	if (read_ec_data(handle, 0x1D, &result))
 		return sprintf(buf, "-1\n");
 	return sprintf(buf, "%lu\n", result);
 }

 static ssize_t store_ideapad_cam(struct device *dev,
 				 struct device_attribute *attr,
 				 const char *buf, size_t count)
 {
 	struct ideapad_private *priv = dev_get_drvdata(dev);
 	acpi_handle handle = priv->handle;
 	int ret, state;

 	if (!count)
 		return 0;
 	if (sscanf(buf, "%i", &state) != 1)
 		return -EINVAL;
 	ret = write_ec_cmd(handle, 0x1E, state);
 	if (ret < 0)
 		return ret;
 	return count;
 }

 static DEVICE_ATTR(camera_power, 0644, show_ideapad_cam, store_ideapad_cam);

 static int ideapad_rfk_set(void *data, bool blocked)
 {
 	int device = (unsigned long)data;

 	if (device == IDEAPAD_DEV_KILLSW)
 		return -EINVAL;

 	return write_ec_cmd(ideapad_priv->handle,
 			    ideapad_rfk_data[device].opcode,
 			    !blocked);
 }

 static struct rfkill_ops ideapad_rfk_ops = {
 	.set_block = ideapad_rfk_set,
 };

 static void ideapad_sync_rfk_state(struct acpi_device *adevice)
 {
 	struct ideapad_private *priv = dev_get_drvdata(&adevice->dev);
 	acpi_handle handle = priv->handle;
 	unsigned long hw_blocked;
 	int i;

 	if (read_ec_data(handle, 0x23, &hw_blocked))
 		return;
 	hw_blocked = !hw_blocked;

 	for (i = IDEAPAD_DEV_WLAN; i <= IDEAPAD_DEV_KILLSW; i++)
 		if (priv->rfk[i])
 			rfkill_set_hw_state(priv->rfk[i], hw_blocked);
 }

 static int ideapad_register_rfkill(struct acpi_device *adevice, int dev)
 {
 	struct ideapad_private *priv = dev_get_drvdata(&adevice->dev);
 	int ret;
 	unsigned long sw_blocked;

 	if (no_bt_rfkill &&
 	    (ideapad_rfk_data[dev].type == RFKILL_TYPE_BLUETOOTH)) {
 		/* Force to enable bluetooth when no_bt_rfkill=1 */
 		write_ec_cmd(ideapad_priv->handle,
 			     ideapad_rfk_data[dev].opcode, 1);
 		return 0;
 	}

 	priv->rfk[dev] = rfkill_alloc(ideapad_rfk_data[dev].name, &adevice->dev,
 				      ideapad_rfk_data[dev].type, &ideapad_rfk_ops,
 				      (void *)(long)dev);
 	if (!priv->rfk[dev])
 		return -ENOMEM;

 	if (read_ec_data(ideapad_priv->handle, ideapad_rfk_data[dev].opcode-1,
 			 &sw_blocked)) {
 		rfkill_init_sw_state(priv->rfk[dev], 0);
 	} else {
 		sw_blocked = !sw_blocked;
 		rfkill_init_sw_state(priv->rfk[dev], sw_blocked);
 	}

 	ret = rfkill_register(priv->rfk[dev]);
 	if (ret) {
 		rfkill_destroy(priv->rfk[dev]);
 		return ret;
 	}
 	return 0;
 }

 static void ideapad_unregister_rfkill(struct acpi_device *adevice, int dev)
 {
 	struct ideapad_private *priv = dev_get_drvdata(&adevice->dev);

 	if (!priv->rfk[dev])
 		return;

 	rfkill_unregister(priv->rfk[dev]);
 	rfkill_destroy(priv->rfk[dev]);
 }

 static const struct acpi_device_id ideapad_device_ids[] = {
 	{ "VPC2004", 0},
 	{ "", 0},
 };
 MODULE_DEVICE_TABLE(acpi, ideapad_device_ids);

 static int ideapad_acpi_add(struct acpi_device *adevice)
 {
 	int i, cfg;
 	int devs_present[5];
 	struct ideapad_private *priv;

 	if (read_method_int(adevice->handle, "_CFG", &cfg))
 		return -ENODEV;

 	for (i = IDEAPAD_DEV_CAMERA; i < IDEAPAD_DEV_KILLSW; i++) {
 		if (test_bit(ideapad_rfk_data[i].cfgbit, (unsigned long *)&cfg))
 			devs_present[i] = 1;
 		else
 			devs_present[i] = 0;
 	}

 	/* The hardware switch is always present */
 	devs_present[IDEAPAD_DEV_KILLSW] = 1;

 	priv = kzalloc(sizeof(*priv), GFP_KERNEL);
 	if (!priv)
 		return -ENOMEM;

 	if (devs_present[IDEAPAD_DEV_CAMERA]) {
 		int ret = device_create_file(&adevice->dev, &dev_attr_camera_power);
 		if (ret) {
 			kfree(priv);
 			return ret;
 		}
 	}

 	priv->handle = adevice->handle;
 	dev_set_drvdata(&adevice->dev, priv);
 	ideapad_priv = priv;
 	for (i = IDEAPAD_DEV_WLAN; i <= IDEAPAD_DEV_KILLSW; i++) {
 		if (!devs_present[i])
 			continue;

 		ideapad_register_rfkill(adevice, i);
 	}
 	ideapad_sync_rfk_state(adevice);
 	return 0;
 }

 static int ideapad_acpi_remove(struct acpi_device *adevice, int type)
 {
 	struct ideapad_private *priv = dev_get_drvdata(&adevice->dev);
 	int i;

 	device_remove_file(&adevice->dev, &dev_attr_camera_power);

 	for (i = IDEAPAD_DEV_WLAN; i <= IDEAPAD_DEV_KILLSW; i++)
 		ideapad_unregister_rfkill(adevice, i);

 	dev_set_drvdata(&adevice->dev, NULL);
 	kfree(priv);
 	return 0;
 }

 static void ideapad_acpi_notify(struct acpi_device *adevice, u32 event)
 {
 	acpi_handle handle = adevice->handle;
 	unsigned long vpc1, vpc2, vpc_bit;

 	if (read_ec_data(handle, 0x10, &vpc1))
 		return;
 	if (read_ec_data(handle, 0x1A, &vpc2))
 		return;

 	vpc1 = (vpc2 << 8) | vpc1;
 	for (vpc_bit = 0; vpc_bit < 16; vpc_bit++) {
 		if (test_bit(vpc_bit, &vpc1)) {
 			if (vpc_bit == 9)
 				ideapad_sync_rfk_state(adevice);
 		}
 	}
 }

 static struct acpi_driver ideapad_acpi_driver = {
 	.name = "ideapad_acpi",
 	.class = "IdeaPad",
 	.ids = ideapad_device_ids,
 	.ops.add = ideapad_acpi_add,
 	.ops.remove = ideapad_acpi_remove,
 	.ops.notify = ideapad_acpi_notify,
 	.owner = THIS_MODULE,
 };


 static int __init ideapad_acpi_module_init(void)
 {
 	acpi_bus_register_driver(&ideapad_acpi_driver);

 	return 0;
 }


 static void __exit ideapad_acpi_module_exit(void)
 {
 	acpi_bus_unregister_driver(&ideapad_acpi_driver);

 }

 MODULE_AUTHOR("David Woodhouse <dwmw2@infradead.org>");
 MODULE_DESCRIPTION("IdeaPad ACPI Extras");
 MODULE_LICENSE("GPL");

 module_init(ideapad_acpi_module_init);
 module_exit(ideapad_acpi_module_exit);
	/*
	* ideapad_acpi.c - Lenovo IdeaPad ACPI Extras
	*
	* Copyright © 2010 Intel Corporation
	* Copyright © 2010 David Woodhouse <dwmw2@infradead.org>
	*
	* 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., 51 Franklin Street, Fifth Floor, Boston, MA
	* 02110-1301, USA.
	*/

	#include <linux/kernel.h>
	#include <linux/module.h>
	#include <linux/init.h>
	#include <linux/types.h>
	#include <acpi/acpi_bus.h>
	#include <acpi/acpi_drivers.h>
	#include <linux/rfkill.h>

	#define IDEAPAD_DEV_CAMERA 0
	#define IDEAPAD_DEV_WLAN 1
	#define IDEAPAD_DEV_BLUETOOTH 2
	#define IDEAPAD_DEV_3G 3
	#define IDEAPAD_DEV_KILLSW 4

	struct ideapad_private {
	acpi_handle handle;
	struct rfkill *rfk[5];
	} *ideapad_priv;

	static struct {
	char *name;
	int cfgbit;
	int opcode;
	int type;
	} ideapad_rfk_data[] = {
	{ "ideapad_camera", 19, 0x1E, NUM_RFKILL_TYPES },
	{ "ideapad_wlan", 18, 0x15, RFKILL_TYPE_WLAN },
	{ "ideapad_bluetooth", 16, 0x17, RFKILL_TYPE_BLUETOOTH },
	{ "ideapad_3g", 17, 0x20, RFKILL_TYPE_WWAN },
	{ "ideapad_killsw", 0, 0, RFKILL_TYPE_WLAN }
	};

	static bool no_bt_rfkill;
	module_param(no_bt_rfkill, bool, 0444);
	MODULE_PARM_DESC(no_bt_rfkill, "No rfkill for bluetooth.");

	/*
	* ACPI Helpers
	*/
	#define IDEAPAD_EC_TIMEOUT (100) /* in ms */

	static int read_method_int(acpi_handle handle, const char method, int val)
	{
	acpi_status status;
	unsigned long long result;

	status = acpi_evaluate_integer(handle, (char *)method, NULL, &result);
	if (ACPI_FAILURE(status)) {
	*val = -1;
	return -1;
	} else {
	*val = result;
	return 0;
	}
	}

	static int method_vpcr(acpi_handle handle, int cmd, int *ret)
	{
	acpi_status status;
	unsigned long long result;
	struct acpi_object_list params;
	union acpi_object in_obj;

	params.count = 1;
	params.pointer = &in_obj;
	in_obj.type = ACPI_TYPE_INTEGER;
	in_obj.integer.value = cmd;

	status = acpi_evaluate_integer(handle, "VPCR", &params, &result);

	if (ACPI_FAILURE(status)) {
	*ret = -1;
	return -1;
	} else {
	*ret = result;
	return 0;
	}
	}

	static int method_vpcw(acpi_handle handle, int cmd, int data)
	{
	struct acpi_object_list params;
	union acpi_object in_obj[2];
	acpi_status status;

	params.count = 2;
	params.pointer = in_obj;
	in_obj[0].type = ACPI_TYPE_INTEGER;
	in_obj[0].integer.value = cmd;
	in_obj[1].type = ACPI_TYPE_INTEGER;
	in_obj[1].integer.value = data;

	status = acpi_evaluate_object(handle, "VPCW", &params, NULL);
	if (status != AE_OK)
	return -1;
	return 0;
	}

	static int read_ec_data(acpi_handle handle, int cmd, unsigned long *data)
	{
	int val;
	unsigned long int end_jiffies;

	if (method_vpcw(handle, 1, cmd))
	return -1;

	for (end_jiffies = jiffies+(HZ)*IDEAPAD_EC_TIMEOUT/1000+1;
	time_before(jiffies, end_jiffies);) {
	schedule();
	if (method_vpcr(handle, 1, &val))
	return -1;
	if (val == 0) {
	if (method_vpcr(handle, 0, &val))
	return -1;
	*data = val;
	return 0;
	}
	}
	pr_err("timeout in read_ec_cmd\n");
	return -1;
	}

	static int write_ec_cmd(acpi_handle handle, int cmd, unsigned long data)
	{
	int val;
	unsigned long int end_jiffies;

	if (method_vpcw(handle, 0, data))
	return -1;
	if (method_vpcw(handle, 1, cmd))
	return -1;

	for (end_jiffies = jiffies+(HZ)*IDEAPAD_EC_TIMEOUT/1000+1;
	time_before(jiffies, end_jiffies);) {
	schedule();
	if (method_vpcr(handle, 1, &val))
	return -1;
	if (val == 0)
	return 0;
	}
	pr_err("timeout in write_ec_cmd\n");
	return -1;
	}
	/* the above is ACPI helpers */

	static ssize_t show_ideapad_cam(struct device *dev,
	struct device_attribute *attr,
	char *buf)
	{
	struct ideapad_private *priv = dev_get_drvdata(dev);
	acpi_handle handle = priv->handle;
	unsigned long result;

	if (read_ec_data(handle, 0x1D, &result))
	return sprintf(buf, "-1\n");
	return sprintf(buf, "%lu\n", result);
	}

	static ssize_t store_ideapad_cam(struct device *dev,
	struct device_attribute *attr,
	const char *buf, size_t count)
	{
	struct ideapad_private *priv = dev_get_drvdata(dev);
	acpi_handle handle = priv->handle;
	int ret, state;

	if (!count)
	return 0;
	if (sscanf(buf, "%i", &state) != 1)
	return -EINVAL;
	ret = write_ec_cmd(handle, 0x1E, state);
	if (ret < 0)
	return ret;
	return count;
	}

	static DEVICE_ATTR(camera_power, 0644, show_ideapad_cam, store_ideapad_cam);

	static int ideapad_rfk_set(void *data, bool blocked)
	{
	int device = (unsigned long)data;

	if (device == IDEAPAD_DEV_KILLSW)
	return -EINVAL;

	return write_ec_cmd(ideapad_priv->handle,
	ideapad_rfk_data[device].opcode,
	!blocked);
	}

	static struct rfkill_ops ideapad_rfk_ops = {
	.set_block = ideapad_rfk_set,
	};

	static void ideapad_sync_rfk_state(struct acpi_device *adevice)
	{
	struct ideapad_private *priv = dev_get_drvdata(&adevice->dev);
	acpi_handle handle = priv->handle;
	unsigned long hw_blocked;
	int i;

	if (read_ec_data(handle, 0x23, &hw_blocked))
	return;
	hw_blocked = !hw_blocked;

	for (i = IDEAPAD_DEV_WLAN; i <= IDEAPAD_DEV_KILLSW; i++)
	if (priv->rfk[i])
	rfkill_set_hw_state(priv->rfk[i], hw_blocked);
	}

	static int ideapad_register_rfkill(struct acpi_device *adevice, int dev)
	{
	struct ideapad_private *priv = dev_get_drvdata(&adevice->dev);
	int ret;
	unsigned long sw_blocked;

	if (no_bt_rfkill &&
	(ideapad_rfk_data[dev].type == RFKILL_TYPE_BLUETOOTH)) {
	/* Force to enable bluetooth when no_bt_rfkill=1 */
	write_ec_cmd(ideapad_priv->handle,
	ideapad_rfk_data[dev].opcode, 1);
	return 0;
	}

	priv->rfk[dev] = rfkill_alloc(ideapad_rfk_data[dev].name, &adevice->dev,
	ideapad_rfk_data[dev].type, &ideapad_rfk_ops,
	(void *)(long)dev);
	if (!priv->rfk[dev])
	return -ENOMEM;

	if (read_ec_data(ideapad_priv->handle, ideapad_rfk_data[dev].opcode-1,
	&sw_blocked)) {
	rfkill_init_sw_state(priv->rfk[dev], 0);
	} else {
	sw_blocked = !sw_blocked;
	rfkill_init_sw_state(priv->rfk[dev], sw_blocked);
	}

	ret = rfkill_register(priv->rfk[dev]);
	if (ret) {
	rfkill_destroy(priv->rfk[dev]);
	return ret;
	}
	return 0;
	}

	static void ideapad_unregister_rfkill(struct acpi_device *adevice, int dev)
	{
	struct ideapad_private *priv = dev_get_drvdata(&adevice->dev);

	if (!priv->rfk[dev])
	return;

	rfkill_unregister(priv->rfk[dev]);
	rfkill_destroy(priv->rfk[dev]);
	}

	static const struct acpi_device_id ideapad_device_ids[] = {
	{ "VPC2004", 0},
	{ "", 0},
	};
	MODULE_DEVICE_TABLE(acpi, ideapad_device_ids);

	static int ideapad_acpi_add(struct acpi_device *adevice)
	{
	int i, cfg;
	int devs_present[5];
	struct ideapad_private *priv;

	if (read_method_int(adevice->handle, "_CFG", &cfg))
	return -ENODEV;

	for (i = IDEAPAD_DEV_CAMERA; i < IDEAPAD_DEV_KILLSW; i++) {
	if (test_bit(ideapad_rfk_data[i].cfgbit, (unsigned long *)&cfg))
	devs_present[i] = 1;
	else
	devs_present[i] = 0;
	}

	/* The hardware switch is always present */
	devs_present[IDEAPAD_DEV_KILLSW] = 1;

	priv = kzalloc(sizeof(*priv), GFP_KERNEL);
	if (!priv)
	return -ENOMEM;

	if (devs_present[IDEAPAD_DEV_CAMERA]) {
	int ret = device_create_file(&adevice->dev, &dev_attr_camera_power);
	if (ret) {
	kfree(priv);
	return ret;
	}
	}

	priv->handle = adevice->handle;
	dev_set_drvdata(&adevice->dev, priv);
	ideapad_priv = priv;
	for (i = IDEAPAD_DEV_WLAN; i <= IDEAPAD_DEV_KILLSW; i++) {
	if (!devs_present[i])
	continue;

	ideapad_register_rfkill(adevice, i);
	}
	ideapad_sync_rfk_state(adevice);
	return 0;
	}

	static int ideapad_acpi_remove(struct acpi_device *adevice, int type)
	{
	struct ideapad_private *priv = dev_get_drvdata(&adevice->dev);
	int i;

	device_remove_file(&adevice->dev, &dev_attr_camera_power);

	for (i = IDEAPAD_DEV_WLAN; i <= IDEAPAD_DEV_KILLSW; i++)
	ideapad_unregister_rfkill(adevice, i);

	dev_set_drvdata(&adevice->dev, NULL);
	kfree(priv);
	return 0;
	}

	static void ideapad_acpi_notify(struct acpi_device *adevice, u32 event)
	{
	acpi_handle handle = adevice->handle;
	unsigned long vpc1, vpc2, vpc_bit;

	if (read_ec_data(handle, 0x10, &vpc1))
	return;
	if (read_ec_data(handle, 0x1A, &vpc2))
	return;

	vpc1 = (vpc2 << 8) \| vpc1;
	for (vpc_bit = 0; vpc_bit < 16; vpc_bit++) {
	if (test_bit(vpc_bit, &vpc1)) {
	if (vpc_bit == 9)
	ideapad_sync_rfk_state(adevice);
	}
	}
	}

	static struct acpi_driver ideapad_acpi_driver = {
	.name = "ideapad_acpi",
	.class = "IdeaPad",
	.ids = ideapad_device_ids,
	.ops.add = ideapad_acpi_add,
	.ops.remove = ideapad_acpi_remove,
	.ops.notify = ideapad_acpi_notify,
	.owner = THIS_MODULE,
	};


	static int __init ideapad_acpi_module_init(void)
	{
	acpi_bus_register_driver(&ideapad_acpi_driver);

	return 0;
	}


	static void __exit ideapad_acpi_module_exit(void)
	{
	acpi_bus_unregister_driver(&ideapad_acpi_driver);

	}

	MODULE_AUTHOR("David Woodhouse <dwmw2@infradead.org>");
	MODULE_DESCRIPTION("IdeaPad ACPI Extras");
	MODULE_LICENSE("GPL");

	module_init(ideapad_acpi_module_init);
	module_exit(ideapad_acpi_module_exit);