drivers/platform/x86/tc1100-wmi.c - kernel/common - Git at Google

 /*
  *  HP Compaq TC1100 Tablet WMI Extras Driver
  *
  *  Copyright (C) 2007 Carlos Corbacho <[email protected]>
  *  Copyright (C) 2004 Jamey Hicks <[email protected]>
  *  Copyright (C) 2001, 2002 Andy Grover <[email protected]>
  *  Copyright (C) 2001, 2002 Paul Diefenbaugh <[email protected]>
  *
  * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
  *
  *  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/slab.h>
 #include <linux/init.h>
 #include <linux/types.h>
 #include <acpi/acpi.h>
 #include <acpi/acpi_bus.h>
 #include <acpi/acpi_drivers.h>
 #include <linux/platform_device.h>

 #define GUID "C364AC71-36DB-495A-8494-B439D472A505"

 #define TC1100_INSTANCE_WIRELESS		1
 #define TC1100_INSTANCE_JOGDIAL		2

 MODULE_AUTHOR("Jamey Hicks, Carlos Corbacho");
 MODULE_DESCRIPTION("HP Compaq TC1100 Tablet WMI Extras");
 MODULE_LICENSE("GPL");
 MODULE_ALIAS("wmi:C364AC71-36DB-495A-8494-B439D472A505");

 static struct platform_device *tc1100_device;

 struct tc1100_data {
 	u32 wireless;
 	u32 jogdial;
 };

 static struct tc1100_data suspend_data;

 /* --------------------------------------------------------------------------
 				Device Management
    -------------------------------------------------------------------------- */

 static int get_state(u32 *out, u8 instance)
 {
 	u32 tmp;
 	acpi_status status;
 	struct acpi_buffer result = { ACPI_ALLOCATE_BUFFER, NULL };
 	union acpi_object *obj;

 	if (!out)
 		return -EINVAL;

 	if (instance > 2)
 		return -ENODEV;

 	status = wmi_query_block(GUID, instance, &result);
 	if (ACPI_FAILURE(status))
 		return -ENODEV;

 	obj = (union acpi_object *) result.pointer;
 	if (obj && obj->type == ACPI_TYPE_INTEGER) {
 		tmp = obj->integer.value;
 	} else {
 		tmp = 0;
 	}

 	if (result.length > 0 && result.pointer)
 		kfree(result.pointer);

 	switch (instance) {
 	case TC1100_INSTANCE_WIRELESS:
 		*out = (tmp == 3) ? 1 : 0;
 		return 0;
 	case TC1100_INSTANCE_JOGDIAL:
 		*out = (tmp == 1) ? 0 : 1;
 		return 0;
 	default:
 		return -ENODEV;
 	}
 }

 static int set_state(u32 *in, u8 instance)
 {
 	u32 value;
 	acpi_status status;
 	struct acpi_buffer input;

 	if (!in)
 		return -EINVAL;

 	if (instance > 2)
 		return -ENODEV;

 	switch (instance) {
 	case TC1100_INSTANCE_WIRELESS:
 		value = (*in) ? 1 : 2;
 		break;
 	case TC1100_INSTANCE_JOGDIAL:
 		value = (*in) ? 0 : 1;
 		break;
 	default:
 		return -ENODEV;
 	}

 	input.length = sizeof(u32);
 	input.pointer = &value;

 	status = wmi_set_block(GUID, instance, &input);
 	if (ACPI_FAILURE(status))
 		return -ENODEV;

 	return 0;
 }

 /* --------------------------------------------------------------------------
 				FS Interface (/sys)
    -------------------------------------------------------------------------- */

 /*
  * Read/ write bool sysfs macro
  */
 #define show_set_bool(value, instance) \
 static ssize_t \
 show_bool_##value(struct device *dev, struct device_attribute *attr, \
 	char *buf) \
 { \
 	u32 result; \
 	acpi_status status = get_state(&result, instance); \
 	if (ACPI_SUCCESS(status)) \
 		return sprintf(buf, "%d\n", result); \
 	return sprintf(buf, "Read error\n"); \
 } \
 \
 static ssize_t \
 set_bool_##value(struct device *dev, struct device_attribute *attr, \
 	const char *buf, size_t count) \
 { \
 	u32 tmp = simple_strtoul(buf, NULL, 10); \
 	acpi_status status = set_state(&tmp, instance); \
 		if (ACPI_FAILURE(status)) \
 			return -EINVAL; \
 	return count; \
 } \
 static DEVICE_ATTR(value, S_IRUGO | S_IWUSR, \
 	show_bool_##value, set_bool_##value);

 show_set_bool(wireless, TC1100_INSTANCE_WIRELESS);
 show_set_bool(jogdial, TC1100_INSTANCE_JOGDIAL);

 static struct attribute *tc1100_attributes[] = {
 	&dev_attr_wireless.attr,
 	&dev_attr_jogdial.attr,
 	NULL
 };

 static struct attribute_group tc1100_attribute_group = {
 	.attrs	= tc1100_attributes,
 };

 /* --------------------------------------------------------------------------
 				Driver Model
    -------------------------------------------------------------------------- */

 static int __init tc1100_probe(struct platform_device *device)
 {
 	return sysfs_create_group(&device->dev.kobj, &tc1100_attribute_group);
 }


 static int __devexit tc1100_remove(struct platform_device *device)
 {
 	sysfs_remove_group(&device->dev.kobj, &tc1100_attribute_group);

 	return 0;
 }

 #ifdef CONFIG_PM
 static int tc1100_suspend(struct device *dev)
 {
 	int ret;

 	ret = get_state(&suspend_data.wireless, TC1100_INSTANCE_WIRELESS);
 	if (ret)
 		return ret;

 	ret = get_state(&suspend_data.jogdial, TC1100_INSTANCE_JOGDIAL);
 	if (ret)
 		return ret;

 	return 0;
 }

 static int tc1100_resume(struct device *dev)
 {
 	int ret;

 	ret = set_state(&suspend_data.wireless, TC1100_INSTANCE_WIRELESS);
 	if (ret)
 		return ret;

 	ret = set_state(&suspend_data.jogdial, TC1100_INSTANCE_JOGDIAL);
 	if (ret)
 		return ret;

 	return 0;
 }

 static const struct dev_pm_ops tc1100_pm_ops = {
 	.suspend	= tc1100_suspend,
 	.resume		= tc1100_resume,
 	.freeze		= tc1100_suspend,
 	.restore	= tc1100_resume,
 };
 #endif

 static struct platform_driver tc1100_driver = {
 	.driver = {
 		.name = "tc1100-wmi",
 		.owner = THIS_MODULE,
 #ifdef CONFIG_PM
 		.pm = &tc1100_pm_ops,
 #endif
 	},
 	.remove = __devexit_p(tc1100_remove),
 };

 static int __init tc1100_init(void)
 {
 	int error;

 	if (!wmi_has_guid(GUID))
 		return -ENODEV;

 	tc1100_device = platform_device_alloc("tc1100-wmi", -1);
 	if (!tc1100_device)
 		return -ENOMEM;

 	error = platform_device_add(tc1100_device);
 	if (error)
 		goto err_device_put;

 	error = platform_driver_probe(&tc1100_driver, tc1100_probe);
 	if (error)
 		goto err_device_del;

 	pr_info("HP Compaq TC1100 Tablet WMI Extras loaded\n");
 	return 0;

  err_device_del:
 	platform_device_del(tc1100_device);
  err_device_put:
 	platform_device_put(tc1100_device);
 	return error;
 }

 static void __exit tc1100_exit(void)
 {
 	platform_device_unregister(tc1100_device);
 	platform_driver_unregister(&tc1100_driver);
 }

 module_init(tc1100_init);
 module_exit(tc1100_exit);
	/*
	* HP Compaq TC1100 Tablet WMI Extras Driver
	*
	* Copyright (C) 2007 Carlos Corbacho <[email protected]>
	* Copyright (C) 2004 Jamey Hicks <[email protected]>
	* Copyright (C) 2001, 2002 Andy Grover <[email protected]>
	* Copyright (C) 2001, 2002 Paul Diefenbaugh <[email protected]>
	*
	* ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
	*
	* 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/slab.h>
	#include <linux/init.h>
	#include <linux/types.h>
	#include <acpi/acpi.h>
	#include <acpi/acpi_bus.h>
	#include <acpi/acpi_drivers.h>
	#include <linux/platform_device.h>

	#define GUID "C364AC71-36DB-495A-8494-B439D472A505"

	#define TC1100_INSTANCE_WIRELESS 1
	#define TC1100_INSTANCE_JOGDIAL 2

	MODULE_AUTHOR("Jamey Hicks, Carlos Corbacho");
	MODULE_DESCRIPTION("HP Compaq TC1100 Tablet WMI Extras");
	MODULE_LICENSE("GPL");
	MODULE_ALIAS("wmi:C364AC71-36DB-495A-8494-B439D472A505");

	static struct platform_device *tc1100_device;

	struct tc1100_data {
	u32 wireless;
	u32 jogdial;
	};

	static struct tc1100_data suspend_data;

	/* --------------------------------------------------------------------------
	Device Management
	-------------------------------------------------------------------------- */

	static int get_state(u32 *out, u8 instance)
	{
	u32 tmp;
	acpi_status status;
	struct acpi_buffer result = { ACPI_ALLOCATE_BUFFER, NULL };
	union acpi_object *obj;

	if (!out)
	return -EINVAL;

	if (instance > 2)
	return -ENODEV;

	status = wmi_query_block(GUID, instance, &result);
	if (ACPI_FAILURE(status))
	return -ENODEV;

	obj = (union acpi_object *) result.pointer;
	if (obj && obj->type == ACPI_TYPE_INTEGER) {
	tmp = obj->integer.value;
	} else {
	tmp = 0;
	}

	if (result.length > 0 && result.pointer)
	kfree(result.pointer);

	switch (instance) {
	case TC1100_INSTANCE_WIRELESS:
	*out = (tmp == 3) ? 1 : 0;
	return 0;
	case TC1100_INSTANCE_JOGDIAL:
	*out = (tmp == 1) ? 0 : 1;
	return 0;
	default:
	return -ENODEV;
	}
	}

	static int set_state(u32 *in, u8 instance)
	{
	u32 value;
	acpi_status status;
	struct acpi_buffer input;

	if (!in)
	return -EINVAL;

	if (instance > 2)
	return -ENODEV;

	switch (instance) {
	case TC1100_INSTANCE_WIRELESS:
	value = (*in) ? 1 : 2;
	break;
	case TC1100_INSTANCE_JOGDIAL:
	value = (*in) ? 0 : 1;
	break;
	default:
	return -ENODEV;
	}

	input.length = sizeof(u32);
	input.pointer = &value;

	status = wmi_set_block(GUID, instance, &input);
	if (ACPI_FAILURE(status))
	return -ENODEV;

	return 0;
	}

	/* --------------------------------------------------------------------------
	FS Interface (/sys)
	-------------------------------------------------------------------------- */

	/*
	* Read/ write bool sysfs macro
	*/
	#define show_set_bool(value, instance) \
	static ssize_t \
	show_bool_##value(struct device dev, struct device_attribute attr, \
	char *buf) \
	{ \
	u32 result; \
	acpi_status status = get_state(&result, instance); \
	if (ACPI_SUCCESS(status)) \
	return sprintf(buf, "%d\n", result); \
	return sprintf(buf, "Read error\n"); \
	} \
	\
	static ssize_t \
	set_bool_##value(struct device dev, struct device_attribute attr, \
	const char *buf, size_t count) \
	{ \
	u32 tmp = simple_strtoul(buf, NULL, 10); \
	acpi_status status = set_state(&tmp, instance); \
	if (ACPI_FAILURE(status)) \
	return -EINVAL; \
	return count; \
	} \
	static DEVICE_ATTR(value, S_IRUGO \| S_IWUSR, \
	show_bool_##value, set_bool_##value);

	show_set_bool(wireless, TC1100_INSTANCE_WIRELESS);
	show_set_bool(jogdial, TC1100_INSTANCE_JOGDIAL);

	static struct attribute *tc1100_attributes[] = {
	&dev_attr_wireless.attr,
	&dev_attr_jogdial.attr,
	NULL
	};

	static struct attribute_group tc1100_attribute_group = {
	.attrs = tc1100_attributes,
	};

	/* --------------------------------------------------------------------------
	Driver Model
	-------------------------------------------------------------------------- */

	static int __init tc1100_probe(struct platform_device *device)
	{
	return sysfs_create_group(&device->dev.kobj, &tc1100_attribute_group);
	}


	static int __devexit tc1100_remove(struct platform_device *device)
	{
	sysfs_remove_group(&device->dev.kobj, &tc1100_attribute_group);

	return 0;
	}

	#ifdef CONFIG_PM
	static int tc1100_suspend(struct device *dev)
	{
	int ret;

	ret = get_state(&suspend_data.wireless, TC1100_INSTANCE_WIRELESS);
	if (ret)
	return ret;

	ret = get_state(&suspend_data.jogdial, TC1100_INSTANCE_JOGDIAL);
	if (ret)
	return ret;

	return 0;
	}

	static int tc1100_resume(struct device *dev)
	{
	int ret;

	ret = set_state(&suspend_data.wireless, TC1100_INSTANCE_WIRELESS);
	if (ret)
	return ret;

	ret = set_state(&suspend_data.jogdial, TC1100_INSTANCE_JOGDIAL);
	if (ret)
	return ret;

	return 0;
	}

	static const struct dev_pm_ops tc1100_pm_ops = {
	.suspend = tc1100_suspend,
	.resume = tc1100_resume,
	.freeze = tc1100_suspend,
	.restore = tc1100_resume,
	};
	#endif

	static struct platform_driver tc1100_driver = {
	.driver = {
	.name = "tc1100-wmi",
	.owner = THIS_MODULE,
	#ifdef CONFIG_PM
	.pm = &tc1100_pm_ops,
	#endif
	},
	.remove = __devexit_p(tc1100_remove),
	};

	static int __init tc1100_init(void)
	{
	int error;

	if (!wmi_has_guid(GUID))
	return -ENODEV;

	tc1100_device = platform_device_alloc("tc1100-wmi", -1);
	if (!tc1100_device)
	return -ENOMEM;

	error = platform_device_add(tc1100_device);
	if (error)
	goto err_device_put;

	error = platform_driver_probe(&tc1100_driver, tc1100_probe);
	if (error)
	goto err_device_del;

	pr_info("HP Compaq TC1100 Tablet WMI Extras loaded\n");
	return 0;

	err_device_del:
	platform_device_del(tc1100_device);
	err_device_put:
	platform_device_put(tc1100_device);
	return error;
	}

	static void __exit tc1100_exit(void)
	{
	platform_device_unregister(tc1100_device);
	platform_driver_unregister(&tc1100_driver);
	}

	module_init(tc1100_init);
	module_exit(tc1100_exit);