drivers/platform/x86/ideapad_acpi.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 {
 	struct rfkill *rfk[5];
 };

 static struct {
 	char *name;
 	int type;
 } ideapad_rfk_data[] = {
 	/* camera has no rfkill */
 	{ "ideapad_wlan",	RFKILL_TYPE_WLAN },
 	{ "ideapad_bluetooth",	RFKILL_TYPE_BLUETOOTH },
 	{ "ideapad_3g",		RFKILL_TYPE_WWAN },
 	{ "ideapad_killsw",	RFKILL_TYPE_WLAN }
 };

 static int ideapad_dev_exists(int device)
 {
 	acpi_status status;
 	union acpi_object in_param;
 	struct acpi_object_list input = { 1, &in_param };
 	struct acpi_buffer output;
 	union acpi_object out_obj;

 	output.length = sizeof(out_obj);
 	output.pointer = &out_obj;

 	in_param.type = ACPI_TYPE_INTEGER;
 	in_param.integer.value = device + 1;

 	status = acpi_evaluate_object(NULL, "\\_SB_.DECN", &input, &output);
 	if (ACPI_FAILURE(status)) {
 		printk(KERN_WARNING "IdeaPAD \\_SB_.DECN method failed %d. Is this an IdeaPAD?\n", status);
 		return -ENODEV;
 	}
 	if (out_obj.type != ACPI_TYPE_INTEGER) {
 		printk(KERN_WARNING "IdeaPAD \\_SB_.DECN method returned unexpected type\n");
 		return -ENODEV;
 	}
 	return out_obj.integer.value;
 }

 static int ideapad_dev_get_state(int device)
 {
 	acpi_status status;
 	union acpi_object in_param;
 	struct acpi_object_list input = { 1, &in_param };
 	struct acpi_buffer output;
 	union acpi_object out_obj;

 	output.length = sizeof(out_obj);
 	output.pointer = &out_obj;

 	in_param.type = ACPI_TYPE_INTEGER;
 	in_param.integer.value = device + 1;

 	status = acpi_evaluate_object(NULL, "\\_SB_.GECN", &input, &output);
 	if (ACPI_FAILURE(status)) {
 		printk(KERN_WARNING "IdeaPAD \\_SB_.GECN method failed %d\n", status);
 		return -ENODEV;
 	}
 	if (out_obj.type != ACPI_TYPE_INTEGER) {
 		printk(KERN_WARNING "IdeaPAD \\_SB_.GECN method returned unexpected type\n");
 		return -ENODEV;
 	}
 	return out_obj.integer.value;
 }

 static int ideapad_dev_set_state(int device, int state)
 {
 	acpi_status status;
 	union acpi_object in_params[2];
 	struct acpi_object_list input = { 2, in_params };

 	in_params[0].type = ACPI_TYPE_INTEGER;
 	in_params[0].integer.value = device + 1;
 	in_params[1].type = ACPI_TYPE_INTEGER;
 	in_params[1].integer.value = state;

 	status = acpi_evaluate_object(NULL, "\\_SB_.SECN", &input, NULL);
 	if (ACPI_FAILURE(status)) {
 		printk(KERN_WARNING "IdeaPAD \\_SB_.SECN method failed %d\n", status);
 		return -ENODEV;
 	}
 	return 0;
 }
 static ssize_t show_ideapad_cam(struct device *dev,
 				struct device_attribute *attr,
 				char *buf)
 {
 	int state = ideapad_dev_get_state(IDEAPAD_DEV_CAMERA);
 	if (state < 0)
 		return state;

 	return sprintf(buf, "%d\n", state);
 }

 static ssize_t store_ideapad_cam(struct device *dev,
 				 struct device_attribute *attr,
 				 const char *buf, size_t count)
 {
 	int ret, state;

 	if (!count)
 		return 0;
 	if (sscanf(buf, "%i", &state) != 1)
 		return -EINVAL;
 	ret = ideapad_dev_set_state(IDEAPAD_DEV_CAMERA, !!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 ideapad_dev_set_state(device, !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);
 	int hw_blocked = !ideapad_dev_get_state(IDEAPAD_DEV_KILLSW);
 	int i;

 	rfkill_set_hw_state(priv->rfk[IDEAPAD_DEV_KILLSW], 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);
 	if (hw_blocked)
 		return;

 	for (i = IDEAPAD_DEV_WLAN; i < IDEAPAD_DEV_KILLSW; i++)
 		if (priv->rfk[i])
 			rfkill_set_sw_state(priv->rfk[i], !ideapad_dev_get_state(i));
 }

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

 	priv->rfk[dev] = rfkill_alloc(ideapad_rfk_data[dev-1].name, &adevice->dev,
 				      ideapad_rfk_data[dev-1].type, &ideapad_rfk_ops,
 				      (void *)(long)dev);
 	if (!priv->rfk[dev])
 		return -ENOMEM;

 	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;
 	int devs_present[5];
 	struct ideapad_private *priv;

 	for (i = IDEAPAD_DEV_CAMERA; i < IDEAPAD_DEV_KILLSW; i++) {
 		devs_present[i] = ideapad_dev_exists(i);
 		if (devs_present[i] < 0)
 			return devs_present[i];
 	}

 	/* 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;
 		}
 	}

 	dev_set_drvdata(&adevice->dev, 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)
 {
 	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 {
	struct rfkill *rfk[5];
	};

	static struct {
	char *name;
	int type;
	} ideapad_rfk_data[] = {
	/* camera has no rfkill */
	{ "ideapad_wlan", RFKILL_TYPE_WLAN },
	{ "ideapad_bluetooth", RFKILL_TYPE_BLUETOOTH },
	{ "ideapad_3g", RFKILL_TYPE_WWAN },
	{ "ideapad_killsw", RFKILL_TYPE_WLAN }
	};

	static int ideapad_dev_exists(int device)
	{
	acpi_status status;
	union acpi_object in_param;
	struct acpi_object_list input = { 1, &in_param };
	struct acpi_buffer output;
	union acpi_object out_obj;

	output.length = sizeof(out_obj);
	output.pointer = &out_obj;

	in_param.type = ACPI_TYPE_INTEGER;
	in_param.integer.value = device + 1;

	status = acpi_evaluate_object(NULL, "\\_SB_.DECN", &input, &output);
	if (ACPI_FAILURE(status)) {
	printk(KERN_WARNING "IdeaPAD \\_SB_.DECN method failed %d. Is this an IdeaPAD?\n", status);
	return -ENODEV;
	}
	if (out_obj.type != ACPI_TYPE_INTEGER) {
	printk(KERN_WARNING "IdeaPAD \\_SB_.DECN method returned unexpected type\n");
	return -ENODEV;
	}
	return out_obj.integer.value;
	}

	static int ideapad_dev_get_state(int device)
	{
	acpi_status status;
	union acpi_object in_param;
	struct acpi_object_list input = { 1, &in_param };
	struct acpi_buffer output;
	union acpi_object out_obj;

	output.length = sizeof(out_obj);
	output.pointer = &out_obj;

	in_param.type = ACPI_TYPE_INTEGER;
	in_param.integer.value = device + 1;

	status = acpi_evaluate_object(NULL, "\\_SB_.GECN", &input, &output);
	if (ACPI_FAILURE(status)) {
	printk(KERN_WARNING "IdeaPAD \\_SB_.GECN method failed %d\n", status);
	return -ENODEV;
	}
	if (out_obj.type != ACPI_TYPE_INTEGER) {
	printk(KERN_WARNING "IdeaPAD \\_SB_.GECN method returned unexpected type\n");
	return -ENODEV;
	}
	return out_obj.integer.value;
	}

	static int ideapad_dev_set_state(int device, int state)
	{
	acpi_status status;
	union acpi_object in_params[2];
	struct acpi_object_list input = { 2, in_params };

	in_params[0].type = ACPI_TYPE_INTEGER;
	in_params[0].integer.value = device + 1;
	in_params[1].type = ACPI_TYPE_INTEGER;
	in_params[1].integer.value = state;

	status = acpi_evaluate_object(NULL, "\\_SB_.SECN", &input, NULL);
	if (ACPI_FAILURE(status)) {
	printk(KERN_WARNING "IdeaPAD \\_SB_.SECN method failed %d\n", status);
	return -ENODEV;
	}
	return 0;
	}
	static ssize_t show_ideapad_cam(struct device *dev,
	struct device_attribute *attr,
	char *buf)
	{
	int state = ideapad_dev_get_state(IDEAPAD_DEV_CAMERA);
	if (state < 0)
	return state;

	return sprintf(buf, "%d\n", state);
	}

	static ssize_t store_ideapad_cam(struct device *dev,
	struct device_attribute *attr,
	const char *buf, size_t count)
	{
	int ret, state;

	if (!count)
	return 0;
	if (sscanf(buf, "%i", &state) != 1)
	return -EINVAL;
	ret = ideapad_dev_set_state(IDEAPAD_DEV_CAMERA, !!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 ideapad_dev_set_state(device, !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);
	int hw_blocked = !ideapad_dev_get_state(IDEAPAD_DEV_KILLSW);
	int i;

	rfkill_set_hw_state(priv->rfk[IDEAPAD_DEV_KILLSW], 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);
	if (hw_blocked)
	return;

	for (i = IDEAPAD_DEV_WLAN; i < IDEAPAD_DEV_KILLSW; i++)
	if (priv->rfk[i])
	rfkill_set_sw_state(priv->rfk[i], !ideapad_dev_get_state(i));
	}

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

	priv->rfk[dev] = rfkill_alloc(ideapad_rfk_data[dev-1].name, &adevice->dev,
	ideapad_rfk_data[dev-1].type, &ideapad_rfk_ops,
	(void *)(long)dev);
	if (!priv->rfk[dev])
	return -ENOMEM;

	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;
	int devs_present[5];
	struct ideapad_private *priv;

	for (i = IDEAPAD_DEV_CAMERA; i < IDEAPAD_DEV_KILLSW; i++) {
	devs_present[i] = ideapad_dev_exists(i);
	if (devs_present[i] < 0)
	return devs_present[i];
	}

	/* 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;
	}
	}

	dev_set_drvdata(&adevice->dev, 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)
	{
	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);