drivers/misc/eeepc-laptop.c - fp2-dev/kernel/msm - Gitiles

 /*
  *  eepc-laptop.c - Asus Eee PC extras
  *
  *  Based on asus_acpi.c as patched for the Eee PC by Asus:
  *  ftp://ftp.asus.com/pub/ASUS/EeePC/701/ASUS_ACPI_071126.rar
  *  Based on eee.c from eeepc-linux
  *
  *  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.
  */

 #include <linux/kernel.h>
 #include <linux/module.h>
 #include <linux/init.h>
 #include <linux/types.h>
 #include <linux/platform_device.h>
 #include <linux/backlight.h>
 #include <linux/fb.h>
 #include <linux/hwmon.h>
 #include <linux/hwmon-sysfs.h>
 #include <acpi/acpi_drivers.h>
 #include <acpi/acpi_bus.h>
 #include <linux/uaccess.h>

 #define EEEPC_LAPTOP_VERSION	"0.1"

 #define EEEPC_HOTK_NAME		"Eee PC Hotkey Driver"
 #define EEEPC_HOTK_FILE		"eeepc"
 #define EEEPC_HOTK_CLASS	"hotkey"
 #define EEEPC_HOTK_DEVICE_NAME	"Hotkey"
 #define EEEPC_HOTK_HID		"ASUS010"

 #define EEEPC_LOG	EEEPC_HOTK_FILE ": "
 #define EEEPC_ERR	KERN_ERR	EEEPC_LOG
 #define EEEPC_WARNING	KERN_WARNING	EEEPC_LOG
 #define EEEPC_NOTICE	KERN_NOTICE	EEEPC_LOG
 #define EEEPC_INFO	KERN_INFO	EEEPC_LOG

 /*
  * Definitions for Asus EeePC
  */
 #define	NOTIFY_WLAN_ON	0x10
 #define NOTIFY_BRN_MIN	0x20
 #define NOTIFY_BRN_MAX	0x2f

 enum {
 	DISABLE_ASL_WLAN = 0x0001,
 	DISABLE_ASL_BLUETOOTH = 0x0002,
 	DISABLE_ASL_IRDA = 0x0004,
 	DISABLE_ASL_CAMERA = 0x0008,
 	DISABLE_ASL_TV = 0x0010,
 	DISABLE_ASL_GPS = 0x0020,
 	DISABLE_ASL_DISPLAYSWITCH = 0x0040,
 	DISABLE_ASL_MODEM = 0x0080,
 	DISABLE_ASL_CARDREADER = 0x0100
 };

 enum {
 	CM_ASL_WLAN = 0,
 	CM_ASL_BLUETOOTH,
 	CM_ASL_IRDA,
 	CM_ASL_1394,
 	CM_ASL_CAMERA,
 	CM_ASL_TV,
 	CM_ASL_GPS,
 	CM_ASL_DVDROM,
 	CM_ASL_DISPLAYSWITCH,
 	CM_ASL_PANELBRIGHT,
 	CM_ASL_BIOSFLASH,
 	CM_ASL_ACPIFLASH,
 	CM_ASL_CPUFV,
 	CM_ASL_CPUTEMPERATURE,
 	CM_ASL_FANCPU,
 	CM_ASL_FANCHASSIS,
 	CM_ASL_USBPORT1,
 	CM_ASL_USBPORT2,
 	CM_ASL_USBPORT3,
 	CM_ASL_MODEM,
 	CM_ASL_CARDREADER,
 	CM_ASL_LID
 };

 static const char *cm_getv[] = {
 	"WLDG", NULL, NULL, NULL,
 	"CAMG", NULL, NULL, NULL,
 	NULL, "PBLG", NULL, NULL,
 	"CFVG", NULL, NULL, NULL,
 	"USBG", NULL, NULL, "MODG",
 	"CRDG", "LIDG"
 };

 static const char *cm_setv[] = {
 	"WLDS", NULL, NULL, NULL,
 	"CAMS", NULL, NULL, NULL,
 	"SDSP", "PBLS", "HDPS", NULL,
 	"CFVS", NULL, NULL, NULL,
 	"USBG", NULL, NULL, "MODS",
 	"CRDS", NULL
 };

 #define EEEPC_EC	"\\_SB.PCI0.SBRG.EC0."

 #define EEEPC_EC_FAN_PWM	EEEPC_EC "SC02" /* Fan PWM duty cycle (%) */
 #define EEEPC_EC_SC02		0x63
 #define EEEPC_EC_FAN_HRPM	EEEPC_EC "SC05" /* High byte, fan speed (RPM) */
 #define EEEPC_EC_FAN_LRPM	EEEPC_EC "SC06" /* Low byte, fan speed (RPM) */
 #define EEEPC_EC_FAN_CTRL	EEEPC_EC "SFB3" /* Byte containing SF25  */
 #define EEEPC_EC_SFB3		0xD3

 /*
  * This is the main structure, we can use it to store useful information
  * about the hotk device
  */
 struct eeepc_hotk {
 	struct acpi_device *device;	/* the device we are in */
 	acpi_handle handle;		/* the handle of the hotk device */
 	u32 cm_supported;		/* the control methods supported
 					   by this BIOS */
 	uint init_flag;			/* Init flags */
 	u16 event_count[128];		/* count for each event */
 };

 /* The actual device the driver binds to */
 static struct eeepc_hotk *ehotk;

 /* Platform device/driver */
 static struct platform_driver platform_driver = {
 	.driver = {
 		.name = EEEPC_HOTK_FILE,
 		.owner = THIS_MODULE,
 	}
 };

 static struct platform_device *platform_device;

 /*
  * The hotkey driver declaration
  */
 static int eeepc_hotk_add(struct acpi_device *device);
 static int eeepc_hotk_remove(struct acpi_device *device, int type);

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

 static struct acpi_driver eeepc_hotk_driver = {
 	.name = EEEPC_HOTK_NAME,
 	.class = EEEPC_HOTK_CLASS,
 	.ids = eeepc_device_ids,
 	.ops = {
 		.add = eeepc_hotk_add,
 		.remove = eeepc_hotk_remove,
 	},
 };

 /* The backlight device /sys/class/backlight */
 static struct backlight_device *eeepc_backlight_device;

 /* The hwmon device */
 static struct device *eeepc_hwmon_device;

 /*
  * The backlight class declaration
  */
 static int read_brightness(struct backlight_device *bd);
 static int update_bl_status(struct backlight_device *bd);
 static struct backlight_ops eeepcbl_ops = {
 	.get_brightness = read_brightness,
 	.update_status = update_bl_status,
 };

 MODULE_AUTHOR("Corentin Chary, Eric Cooper");
 MODULE_DESCRIPTION(EEEPC_HOTK_NAME);
 MODULE_LICENSE("GPL");

 /*
  * ACPI Helpers
  */
 static int write_acpi_int(acpi_handle handle, const char *method, int val,
 			  struct acpi_buffer *output)
 {
 	struct acpi_object_list params;
 	union acpi_object in_obj;
 	acpi_status status;

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

 	status = acpi_evaluate_object(handle, (char *)method, &params, output);
 	return (status == AE_OK ? 0 : -1);
 }

 static int read_acpi_int(acpi_handle handle, const char *method, int *val)
 {
 	acpi_status status;
 	ulong 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 set_acpi(int cm, int value)
 {
 	if (ehotk->cm_supported & (0x1 << cm)) {
 		const char *method = cm_setv[cm];
 		if (method == NULL)
 			return -ENODEV;
 		if (write_acpi_int(ehotk->handle, method, value, NULL))
 			printk(EEEPC_WARNING "Error writing %s\n", method);
 	}
 	return 0;
 }

 static int get_acpi(int cm)
 {
 	int value = -1;
 	if ((ehotk->cm_supported & (0x1 << cm))) {
 		const char *method = cm_getv[cm];
 		if (method == NULL)
 			return -ENODEV;
 		if (read_acpi_int(ehotk->handle, method, &value))
 			printk(EEEPC_WARNING "Error reading %s\n", method);
 	}
 	return value;
 }

 /*
  * Backlight
  */
 static int read_brightness(struct backlight_device *bd)
 {
 	return get_acpi(CM_ASL_PANELBRIGHT);
 }

 static int set_brightness(struct backlight_device *bd, int value)
 {
 	value = max(0, min(15, value));
 	return set_acpi(CM_ASL_PANELBRIGHT, value);
 }

 static int update_bl_status(struct backlight_device *bd)
 {
 	return set_brightness(bd, bd->props.brightness);
 }

 /*
  * Sys helpers
  */
 static int parse_arg(const char *buf, unsigned long count, int *val)
 {
 	if (!count)
 		return 0;
 	if (sscanf(buf, "%i", val) != 1)
 		return -EINVAL;
 	return count;
 }

 static ssize_t store_sys_acpi(int cm, const char *buf, size_t count)
 {
 	int rv, value;

 	rv = parse_arg(buf, count, &value);
 	if (rv > 0)
 		set_acpi(cm, value);
 	return rv;
 }

 static ssize_t show_sys_acpi(int cm, char *buf)
 {
 	return sprintf(buf, "%d\n", get_acpi(cm));
 }

 #define EEEPC_CREATE_DEVICE_ATTR(_name, _cm)				\
 	static ssize_t show_##_name(struct device *dev,			\
 				    struct device_attribute *attr,	\
 				    char *buf)				\
 	{								\
 		return show_sys_acpi(_cm, buf);				\
 	}								\
 	static ssize_t store_##_name(struct device *dev,		\
 				     struct device_attribute *attr,	\
 				     const char *buf, size_t count)	\
 	{								\
 		return store_sys_acpi(_cm, buf, count);			\
 	}								\
 	static struct device_attribute dev_attr_##_name = {		\
 		.attr = {						\
 			.name = __stringify(_name),			\
 			.mode = 0644 },					\
 		.show   = show_##_name,					\
 		.store  = store_##_name,				\
 	}

 EEEPC_CREATE_DEVICE_ATTR(camera, CM_ASL_CAMERA);
 EEEPC_CREATE_DEVICE_ATTR(cardr, CM_ASL_CARDREADER);
 EEEPC_CREATE_DEVICE_ATTR(disp, CM_ASL_DISPLAYSWITCH);
 EEEPC_CREATE_DEVICE_ATTR(wlan, CM_ASL_WLAN);

 static struct attribute *platform_attributes[] = {
 	&dev_attr_camera.attr,
 	&dev_attr_cardr.attr,
 	&dev_attr_disp.attr,
 	&dev_attr_wlan.attr,
 	NULL
 };

 static struct attribute_group platform_attribute_group = {
 	.attrs = platform_attributes
 };

 /*
  * Hotkey functions
  */
 static int eeepc_hotk_check(void)
 {
 	struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
 	int result;

 	result = acpi_bus_get_status(ehotk->device);
 	if (result)
 		return result;
 	if (ehotk->device->status.present) {
 		if (write_acpi_int(ehotk->handle, "INIT", ehotk->init_flag,
 				    &buffer)) {
 			printk(EEEPC_ERR "Hotkey initialization failed\n");
 			return -ENODEV;
 		} else {
 			printk(EEEPC_NOTICE "Hotkey init flags 0x%x\n",
 			       ehotk->init_flag);
 		}
 		/* get control methods supported */
 		if (read_acpi_int(ehotk->handle, "CMSG"
 				   , &ehotk->cm_supported)) {
 			printk(EEEPC_ERR
 			       "Get control methods supported failed\n");
 			return -ENODEV;
 		} else {
 			printk(EEEPC_INFO
 			       "Get control methods supported: 0x%x\n",
 			       ehotk->cm_supported);
 		}
 	} else {
 		printk(EEEPC_ERR "Hotkey device not present, aborting\n");
 		return -EINVAL;
 	}
 	return 0;
 }

 static void notify_wlan(u32 *event)
 {
 	/* if DISABLE_ASL_WLAN is set, the notify code for fn+f2
 	   will always be 0x10 */
 	if (ehotk->cm_supported & (0x1 << CM_ASL_WLAN)) {
 		const char *method = cm_getv[CM_ASL_WLAN];
 		int value;
 		if (read_acpi_int(ehotk->handle, method, &value))
 			printk(EEEPC_WARNING "Error reading %s\n",
 			       method);
 		else if (value == 1)
 			*event = 0x11;
 	}
 }

 static void notify_brn(void)
 {
 	struct backlight_device *bd = eeepc_backlight_device;
 	bd->props.brightness = read_brightness(bd);
 }

 static void eeepc_hotk_notify(acpi_handle handle, u32 event, void *data)
 {
 	if (!ehotk)
 		return;
 	if (event == NOTIFY_WLAN_ON && (DISABLE_ASL_WLAN & ehotk->init_flag))
 		notify_wlan(&event);
 	if (event >= NOTIFY_BRN_MIN && event <= NOTIFY_BRN_MAX)
 		notify_brn();
 	acpi_bus_generate_proc_event(ehotk->device, event,
 				     ehotk->event_count[event % 128]++);
 }

 static int eeepc_hotk_add(struct acpi_device *device)
 {
 	acpi_status status = AE_OK;
 	int result;

 	if (!device)
 		 return -EINVAL;
 	printk(EEEPC_NOTICE EEEPC_HOTK_NAME "\n");
 	ehotk = kzalloc(sizeof(struct eeepc_hotk), GFP_KERNEL);
 	if (!ehotk)
 		return -ENOMEM;
 	ehotk->init_flag = DISABLE_ASL_WLAN | DISABLE_ASL_DISPLAYSWITCH;
 	ehotk->handle = device->handle;
 	strcpy(acpi_device_name(device), EEEPC_HOTK_DEVICE_NAME);
 	strcpy(acpi_device_class(device), EEEPC_HOTK_CLASS);
 	acpi_driver_data(device) = ehotk;
 	ehotk->device = device;
 	result = eeepc_hotk_check();
 	if (result)
 		goto end;
 	status = acpi_install_notify_handler(ehotk->handle, ACPI_SYSTEM_NOTIFY,
 					     eeepc_hotk_notify, ehotk);
 	if (ACPI_FAILURE(status))
 		printk(EEEPC_ERR "Error installing notify handler\n");
  end:
 	if (result) {
 		kfree(ehotk);
 		ehotk = NULL;
 	}
 	return result;
 }

 static int eeepc_hotk_remove(struct acpi_device *device, int type)
 {
 	acpi_status status = 0;

 	if (!device || !acpi_driver_data(device))
 		 return -EINVAL;
 	status = acpi_remove_notify_handler(ehotk->handle, ACPI_SYSTEM_NOTIFY,
 					    eeepc_hotk_notify);
 	if (ACPI_FAILURE(status))
 		printk(EEEPC_ERR "Error removing notify handler\n");
 	kfree(ehotk);
 	return 0;
 }

 /*
  * Hwmon
  */
 static int eeepc_get_fan_pwm(void)
 {
 	int value = 0;

 	read_acpi_int(NULL, EEEPC_EC_FAN_PWM, &value);
 	value = value * 255 / 100;
 	return (value);
 }

 static void eeepc_set_fan_pwm(int value)
 {
 	value = SENSORS_LIMIT(value, 0, 255);
 	value = value * 100 / 255;
 	ec_write(EEEPC_EC_SC02, value);
 }

 static int eeepc_get_fan_rpm(void)
 {
 	int high = 0;
 	int low = 0;

 	read_acpi_int(NULL, EEEPC_EC_FAN_HRPM, &high);
 	read_acpi_int(NULL, EEEPC_EC_FAN_LRPM, &low);
 	return (high << 8 | low);
 }

 static int eeepc_get_fan_ctrl(void)
 {
 	int value = 0;

 	read_acpi_int(NULL, EEEPC_EC_FAN_CTRL, &value);
 	return ((value & 0x02 ? 1 : 0));
 }

 static void eeepc_set_fan_ctrl(int manual)
 {
 	int value = 0;

 	read_acpi_int(NULL, EEEPC_EC_FAN_CTRL, &value);
 	if (manual)
 		value |= 0x02;
 	else
 		value &= ~0x02;
 	ec_write(EEEPC_EC_SFB3, value);
 }

 static ssize_t store_sys_hwmon(void (*set)(int), const char *buf, size_t count)
 {
 	int rv, value;

 	rv = parse_arg(buf, count, &value);
 	if (rv > 0)
 		set(value);
 	return rv;
 }

 static ssize_t show_sys_hwmon(int (*get)(void), char *buf)
 {
 	return sprintf(buf, "%d\n", get());
 }

 #define EEEPC_CREATE_SENSOR_ATTR(_name, _mode, _set, _get)		\
 	static ssize_t show_##_name(struct device *dev,			\
 				    struct device_attribute *attr,	\
 				    char *buf)				\
 	{								\
 		return show_sys_hwmon(_set, buf);			\
 	}								\
 	static ssize_t store_##_name(struct device *dev,		\
 				     struct device_attribute *attr,	\
 				     const char *buf, size_t count)	\
 	{								\
 		return store_sys_hwmon(_get, buf, count);		\
 	}								\
 	static SENSOR_DEVICE_ATTR(_name, _mode, show_##_name, store_##_name, 0);

 EEEPC_CREATE_SENSOR_ATTR(fan1_input, S_IRUGO, eeepc_get_fan_rpm, NULL);
 EEEPC_CREATE_SENSOR_ATTR(pwm1, S_IRUGO | S_IWUSR,
 			 eeepc_get_fan_pwm, eeepc_set_fan_pwm);
 EEEPC_CREATE_SENSOR_ATTR(pwm1_enable, S_IRUGO | S_IWUSR,
 			 eeepc_get_fan_ctrl, eeepc_set_fan_ctrl);

 static ssize_t
 show_name(struct device *dev, struct device_attribute *attr, char *buf)
 {
 	return sprintf(buf, "eeepc\n");
 }
 static SENSOR_DEVICE_ATTR(name, S_IRUGO, show_name, NULL, 0);

 static struct attribute *hwmon_attributes[] = {
 	&sensor_dev_attr_pwm1.dev_attr.attr,
 	&sensor_dev_attr_fan1_input.dev_attr.attr,
 	&sensor_dev_attr_pwm1_enable.dev_attr.attr,
 	&sensor_dev_attr_name.dev_attr.attr,
 	NULL
 };

 static struct attribute_group hwmon_attribute_group = {
 	.attrs = hwmon_attributes
 };

 /*
  * exit/init
  */
 static void eeepc_backlight_exit(void)
 {
 	if (eeepc_backlight_device)
 		backlight_device_unregister(eeepc_backlight_device);
 	eeepc_backlight_device = NULL;
 }

 static void eeepc_hwmon_exit(void)
 {
 	struct device *hwmon;

 	hwmon = eeepc_hwmon_device;
 	if (!hwmon)
 		return ;
 	sysfs_remove_group(&hwmon->kobj,
 			   &hwmon_attribute_group);
 	hwmon_device_unregister(hwmon);
 	eeepc_hwmon_device = NULL;
 }

 static void __exit eeepc_laptop_exit(void)
 {
 	eeepc_backlight_exit();
 	eeepc_hwmon_exit();
 	acpi_bus_unregister_driver(&eeepc_hotk_driver);
 	sysfs_remove_group(&platform_device->dev.kobj,
 			   &platform_attribute_group);
 	platform_device_unregister(platform_device);
 	platform_driver_unregister(&platform_driver);
 }

 static int eeepc_backlight_init(struct device *dev)
 {
 	struct backlight_device *bd;

 	bd = backlight_device_register(EEEPC_HOTK_FILE, dev,
 				       NULL, &eeepcbl_ops);
 	if (IS_ERR(bd)) {
 		printk(EEEPC_ERR
 		       "Could not register eeepc backlight device\n");
 		eeepc_backlight_device = NULL;
 		return PTR_ERR(bd);
 	}
 	eeepc_backlight_device = bd;
 	bd->props.max_brightness = 15;
 	bd->props.brightness = read_brightness(NULL);
 	bd->props.power = FB_BLANK_UNBLANK;
 	backlight_update_status(bd);
 	return 0;
 }

 static int eeepc_hwmon_init(struct device *dev)
 {
 	struct device *hwmon;
 	int result;

 	hwmon = hwmon_device_register(dev);
 	if (IS_ERR(hwmon)) {
 		printk(EEEPC_ERR
 		       "Could not register eeepc hwmon device\n");
 		eeepc_hwmon_device = NULL;
 		return PTR_ERR(hwmon);
 	}
 	eeepc_hwmon_device = hwmon;
 	result = sysfs_create_group(&hwmon->kobj,
 				    &hwmon_attribute_group);
 	if (result)
 		eeepc_hwmon_exit();
 	return result;
 }

 static int __init eeepc_laptop_init(void)
 {
 	struct device *dev;
 	int result;

 	if (acpi_disabled)
 		return -ENODEV;
 	result = acpi_bus_register_driver(&eeepc_hotk_driver);
 	if (result < 0)
 		return result;
 	if (!ehotk) {
 		acpi_bus_unregister_driver(&eeepc_hotk_driver);
 		return -ENODEV;
 	}
 	dev = acpi_get_physical_device(ehotk->device->handle);
 	result = eeepc_backlight_init(dev);
 	if (result)
 		goto fail_backlight;
 	result = eeepc_hwmon_init(dev);
 	if (result)
 		goto fail_hwmon;
 	/* Register platform stuff */
 	result = platform_driver_register(&platform_driver);
 	if (result)
 		goto fail_platform_driver;
 	platform_device = platform_device_alloc(EEEPC_HOTK_FILE, -1);
 	if (!platform_device) {
 		result = -ENOMEM;
 		goto fail_platform_device1;
 	}
 	result = platform_device_add(platform_device);
 	if (result)
 		goto fail_platform_device2;
 	result = sysfs_create_group(&platform_device->dev.kobj,
 				    &platform_attribute_group);
 	if (result)
 		goto fail_sysfs;
 	return 0;
 fail_sysfs:
 	platform_device_del(platform_device);
 fail_platform_device2:
 	platform_device_put(platform_device);
 fail_platform_device1:
 	platform_driver_unregister(&platform_driver);
 fail_platform_driver:
 	eeepc_hwmon_exit();
 fail_hwmon:
 	eeepc_backlight_exit();
 fail_backlight:
 	return result;
 }

 module_init(eeepc_laptop_init);
 module_exit(eeepc_laptop_exit);
	/*
	* eepc-laptop.c - Asus Eee PC extras
	*
	* Based on asus_acpi.c as patched for the Eee PC by Asus:
	* ftp://ftp.asus.com/pub/ASUS/EeePC/701/ASUS_ACPI_071126.rar
	* Based on eee.c from eeepc-linux
	*
	* 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.
	*/

	#include <linux/kernel.h>
	#include <linux/module.h>
	#include <linux/init.h>
	#include <linux/types.h>
	#include <linux/platform_device.h>
	#include <linux/backlight.h>
	#include <linux/fb.h>
	#include <linux/hwmon.h>
	#include <linux/hwmon-sysfs.h>
	#include <acpi/acpi_drivers.h>
	#include <acpi/acpi_bus.h>
	#include <linux/uaccess.h>

	#define EEEPC_LAPTOP_VERSION "0.1"

	#define EEEPC_HOTK_NAME "Eee PC Hotkey Driver"
	#define EEEPC_HOTK_FILE "eeepc"
	#define EEEPC_HOTK_CLASS "hotkey"
	#define EEEPC_HOTK_DEVICE_NAME "Hotkey"
	#define EEEPC_HOTK_HID "ASUS010"

	#define EEEPC_LOG EEEPC_HOTK_FILE ": "
	#define EEEPC_ERR KERN_ERR EEEPC_LOG
	#define EEEPC_WARNING KERN_WARNING EEEPC_LOG
	#define EEEPC_NOTICE KERN_NOTICE EEEPC_LOG
	#define EEEPC_INFO KERN_INFO EEEPC_LOG

	/*
	* Definitions for Asus EeePC
	*/
	#define NOTIFY_WLAN_ON 0x10
	#define NOTIFY_BRN_MIN 0x20
	#define NOTIFY_BRN_MAX 0x2f

	enum {
	DISABLE_ASL_WLAN = 0x0001,
	DISABLE_ASL_BLUETOOTH = 0x0002,
	DISABLE_ASL_IRDA = 0x0004,
	DISABLE_ASL_CAMERA = 0x0008,
	DISABLE_ASL_TV = 0x0010,
	DISABLE_ASL_GPS = 0x0020,
	DISABLE_ASL_DISPLAYSWITCH = 0x0040,
	DISABLE_ASL_MODEM = 0x0080,
	DISABLE_ASL_CARDREADER = 0x0100
	};

	enum {
	CM_ASL_WLAN = 0,
	CM_ASL_BLUETOOTH,
	CM_ASL_IRDA,
	CM_ASL_1394,
	CM_ASL_CAMERA,
	CM_ASL_TV,
	CM_ASL_GPS,
	CM_ASL_DVDROM,
	CM_ASL_DISPLAYSWITCH,
	CM_ASL_PANELBRIGHT,
	CM_ASL_BIOSFLASH,
	CM_ASL_ACPIFLASH,
	CM_ASL_CPUFV,
	CM_ASL_CPUTEMPERATURE,
	CM_ASL_FANCPU,
	CM_ASL_FANCHASSIS,
	CM_ASL_USBPORT1,
	CM_ASL_USBPORT2,
	CM_ASL_USBPORT3,
	CM_ASL_MODEM,
	CM_ASL_CARDREADER,
	CM_ASL_LID
	};

	static const char *cm_getv[] = {
	"WLDG", NULL, NULL, NULL,
	"CAMG", NULL, NULL, NULL,
	NULL, "PBLG", NULL, NULL,
	"CFVG", NULL, NULL, NULL,
	"USBG", NULL, NULL, "MODG",
	"CRDG", "LIDG"
	};

	static const char *cm_setv[] = {
	"WLDS", NULL, NULL, NULL,
	"CAMS", NULL, NULL, NULL,
	"SDSP", "PBLS", "HDPS", NULL,
	"CFVS", NULL, NULL, NULL,
	"USBG", NULL, NULL, "MODS",
	"CRDS", NULL
	};

	#define EEEPC_EC "\\_SB.PCI0.SBRG.EC0."

	#define EEEPC_EC_FAN_PWM EEEPC_EC "SC02" /* Fan PWM duty cycle (%) */
	#define EEEPC_EC_SC02 0x63
	#define EEEPC_EC_FAN_HRPM EEEPC_EC "SC05" /* High byte, fan speed (RPM) */
	#define EEEPC_EC_FAN_LRPM EEEPC_EC "SC06" /* Low byte, fan speed (RPM) */
	#define EEEPC_EC_FAN_CTRL EEEPC_EC "SFB3" /* Byte containing SF25 */
	#define EEEPC_EC_SFB3 0xD3

	/*
	* This is the main structure, we can use it to store useful information
	* about the hotk device
	*/
	struct eeepc_hotk {
	struct acpi_device device; / the device we are in */
	acpi_handle handle; /* the handle of the hotk device */
	u32 cm_supported; /* the control methods supported
	by this BIOS */
	uint init_flag; /* Init flags */
	u16 event_count[128]; /* count for each event */
	};

	/* The actual device the driver binds to */
	static struct eeepc_hotk *ehotk;

	/* Platform device/driver */
	static struct platform_driver platform_driver = {
	.driver = {
	.name = EEEPC_HOTK_FILE,
	.owner = THIS_MODULE,
	}
	};

	static struct platform_device *platform_device;

	/*
	* The hotkey driver declaration
	*/
	static int eeepc_hotk_add(struct acpi_device *device);
	static int eeepc_hotk_remove(struct acpi_device *device, int type);

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

	static struct acpi_driver eeepc_hotk_driver = {
	.name = EEEPC_HOTK_NAME,
	.class = EEEPC_HOTK_CLASS,
	.ids = eeepc_device_ids,
	.ops = {
	.add = eeepc_hotk_add,
	.remove = eeepc_hotk_remove,
	},
	};

	/* The backlight device /sys/class/backlight */
	static struct backlight_device *eeepc_backlight_device;

	/* The hwmon device */
	static struct device *eeepc_hwmon_device;

	/*
	* The backlight class declaration
	*/
	static int read_brightness(struct backlight_device *bd);
	static int update_bl_status(struct backlight_device *bd);
	static struct backlight_ops eeepcbl_ops = {
	.get_brightness = read_brightness,
	.update_status = update_bl_status,
	};

	MODULE_AUTHOR("Corentin Chary, Eric Cooper");
	MODULE_DESCRIPTION(EEEPC_HOTK_NAME);
	MODULE_LICENSE("GPL");

	/*
	* ACPI Helpers
	*/
	static int write_acpi_int(acpi_handle handle, const char *method, int val,
	struct acpi_buffer *output)
	{
	struct acpi_object_list params;
	union acpi_object in_obj;
	acpi_status status;

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

	status = acpi_evaluate_object(handle, (char *)method, &params, output);
	return (status == AE_OK ? 0 : -1);
	}

	static int read_acpi_int(acpi_handle handle, const char method, int val)
	{
	acpi_status status;
	ulong 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 set_acpi(int cm, int value)
	{
	if (ehotk->cm_supported & (0x1 << cm)) {
	const char *method = cm_setv[cm];
	if (method == NULL)
	return -ENODEV;
	if (write_acpi_int(ehotk->handle, method, value, NULL))
	printk(EEEPC_WARNING "Error writing %s\n", method);
	}
	return 0;
	}

	static int get_acpi(int cm)
	{
	int value = -1;
	if ((ehotk->cm_supported & (0x1 << cm))) {
	const char *method = cm_getv[cm];
	if (method == NULL)
	return -ENODEV;
	if (read_acpi_int(ehotk->handle, method, &value))
	printk(EEEPC_WARNING "Error reading %s\n", method);
	}
	return value;
	}

	/*
	* Backlight
	*/
	static int read_brightness(struct backlight_device *bd)
	{
	return get_acpi(CM_ASL_PANELBRIGHT);
	}

	static int set_brightness(struct backlight_device *bd, int value)
	{
	value = max(0, min(15, value));
	return set_acpi(CM_ASL_PANELBRIGHT, value);
	}

	static int update_bl_status(struct backlight_device *bd)
	{
	return set_brightness(bd, bd->props.brightness);
	}

	/*
	* Sys helpers
	*/
	static int parse_arg(const char buf, unsigned long count, int val)
	{
	if (!count)
	return 0;
	if (sscanf(buf, "%i", val) != 1)
	return -EINVAL;
	return count;
	}

	static ssize_t store_sys_acpi(int cm, const char *buf, size_t count)
	{
	int rv, value;

	rv = parse_arg(buf, count, &value);
	if (rv > 0)
	set_acpi(cm, value);
	return rv;
	}

	static ssize_t show_sys_acpi(int cm, char *buf)
	{
	return sprintf(buf, "%d\n", get_acpi(cm));
	}

	#define EEEPC_CREATE_DEVICE_ATTR(_name, _cm) \
	static ssize_t show_##_name(struct device *dev, \
	struct device_attribute *attr, \
	char *buf) \
	{ \
	return show_sys_acpi(_cm, buf); \
	} \
	static ssize_t store_##_name(struct device *dev, \
	struct device_attribute *attr, \
	const char *buf, size_t count) \
	{ \
	return store_sys_acpi(_cm, buf, count); \
	} \
	static struct device_attribute dev_attr_##_name = { \
	.attr = { \
	.name = __stringify(_name), \
	.mode = 0644 }, \
	.show = show_##_name, \
	.store = store_##_name, \
	}

	EEEPC_CREATE_DEVICE_ATTR(camera, CM_ASL_CAMERA);
	EEEPC_CREATE_DEVICE_ATTR(cardr, CM_ASL_CARDREADER);
	EEEPC_CREATE_DEVICE_ATTR(disp, CM_ASL_DISPLAYSWITCH);
	EEEPC_CREATE_DEVICE_ATTR(wlan, CM_ASL_WLAN);

	static struct attribute *platform_attributes[] = {
	&dev_attr_camera.attr,
	&dev_attr_cardr.attr,
	&dev_attr_disp.attr,
	&dev_attr_wlan.attr,
	NULL
	};

	static struct attribute_group platform_attribute_group = {
	.attrs = platform_attributes
	};

	/*
	* Hotkey functions
	*/
	static int eeepc_hotk_check(void)
	{
	struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
	int result;

	result = acpi_bus_get_status(ehotk->device);
	if (result)
	return result;
	if (ehotk->device->status.present) {
	if (write_acpi_int(ehotk->handle, "INIT", ehotk->init_flag,
	&buffer)) {
	printk(EEEPC_ERR "Hotkey initialization failed\n");
	return -ENODEV;
	} else {
	printk(EEEPC_NOTICE "Hotkey init flags 0x%x\n",
	ehotk->init_flag);
	}
	/* get control methods supported */
	if (read_acpi_int(ehotk->handle, "CMSG"
	, &ehotk->cm_supported)) {
	printk(EEEPC_ERR
	"Get control methods supported failed\n");
	return -ENODEV;
	} else {
	printk(EEEPC_INFO
	"Get control methods supported: 0x%x\n",
	ehotk->cm_supported);
	}
	} else {
	printk(EEEPC_ERR "Hotkey device not present, aborting\n");
	return -EINVAL;
	}
	return 0;
	}

	static void notify_wlan(u32 *event)
	{
	/* if DISABLE_ASL_WLAN is set, the notify code for fn+f2
	will always be 0x10 */
	if (ehotk->cm_supported & (0x1 << CM_ASL_WLAN)) {
	const char *method = cm_getv[CM_ASL_WLAN];
	int value;
	if (read_acpi_int(ehotk->handle, method, &value))
	printk(EEEPC_WARNING "Error reading %s\n",
	method);
	else if (value == 1)
	*event = 0x11;
	}
	}

	static void notify_brn(void)
	{
	struct backlight_device *bd = eeepc_backlight_device;
	bd->props.brightness = read_brightness(bd);
	}

	static void eeepc_hotk_notify(acpi_handle handle, u32 event, void *data)
	{
	if (!ehotk)
	return;
	if (event == NOTIFY_WLAN_ON && (DISABLE_ASL_WLAN & ehotk->init_flag))
	notify_wlan(&event);
	if (event >= NOTIFY_BRN_MIN && event <= NOTIFY_BRN_MAX)
	notify_brn();
	acpi_bus_generate_proc_event(ehotk->device, event,
	ehotk->event_count[event % 128]++);
	}

	static int eeepc_hotk_add(struct acpi_device *device)
	{
	acpi_status status = AE_OK;
	int result;

	if (!device)
	return -EINVAL;
	printk(EEEPC_NOTICE EEEPC_HOTK_NAME "\n");
	ehotk = kzalloc(sizeof(struct eeepc_hotk), GFP_KERNEL);
	if (!ehotk)
	return -ENOMEM;
	ehotk->init_flag = DISABLE_ASL_WLAN \| DISABLE_ASL_DISPLAYSWITCH;
	ehotk->handle = device->handle;
	strcpy(acpi_device_name(device), EEEPC_HOTK_DEVICE_NAME);
	strcpy(acpi_device_class(device), EEEPC_HOTK_CLASS);
	acpi_driver_data(device) = ehotk;
	ehotk->device = device;
	result = eeepc_hotk_check();
	if (result)
	goto end;
	status = acpi_install_notify_handler(ehotk->handle, ACPI_SYSTEM_NOTIFY,
	eeepc_hotk_notify, ehotk);
	if (ACPI_FAILURE(status))
	printk(EEEPC_ERR "Error installing notify handler\n");
	end:
	if (result) {
	kfree(ehotk);
	ehotk = NULL;
	}
	return result;
	}

	static int eeepc_hotk_remove(struct acpi_device *device, int type)
	{
	acpi_status status = 0;

	if (!device \|\| !acpi_driver_data(device))
	return -EINVAL;
	status = acpi_remove_notify_handler(ehotk->handle, ACPI_SYSTEM_NOTIFY,
	eeepc_hotk_notify);
	if (ACPI_FAILURE(status))
	printk(EEEPC_ERR "Error removing notify handler\n");
	kfree(ehotk);
	return 0;
	}

	/*
	* Hwmon
	*/
	static int eeepc_get_fan_pwm(void)
	{
	int value = 0;

	read_acpi_int(NULL, EEEPC_EC_FAN_PWM, &value);
	value = value * 255 / 100;
	return (value);
	}

	static void eeepc_set_fan_pwm(int value)
	{
	value = SENSORS_LIMIT(value, 0, 255);
	value = value * 100 / 255;
	ec_write(EEEPC_EC_SC02, value);
	}

	static int eeepc_get_fan_rpm(void)
	{
	int high = 0;
	int low = 0;

	read_acpi_int(NULL, EEEPC_EC_FAN_HRPM, &high);
	read_acpi_int(NULL, EEEPC_EC_FAN_LRPM, &low);
	return (high << 8 \| low);
	}

	static int eeepc_get_fan_ctrl(void)
	{
	int value = 0;

	read_acpi_int(NULL, EEEPC_EC_FAN_CTRL, &value);
	return ((value & 0x02 ? 1 : 0));
	}

	static void eeepc_set_fan_ctrl(int manual)
	{
	int value = 0;

	read_acpi_int(NULL, EEEPC_EC_FAN_CTRL, &value);
	if (manual)
	value \|= 0x02;
	else
	value &= ~0x02;
	ec_write(EEEPC_EC_SFB3, value);
	}

	static ssize_t store_sys_hwmon(void (set)(int), const char buf, size_t count)
	{
	int rv, value;

	rv = parse_arg(buf, count, &value);
	if (rv > 0)
	set(value);
	return rv;
	}

	static ssize_t show_sys_hwmon(int (get)(void), char buf)
	{
	return sprintf(buf, "%d\n", get());
	}

	#define EEEPC_CREATE_SENSOR_ATTR(_name, _mode, _set, _get) \
	static ssize_t show_##_name(struct device *dev, \
	struct device_attribute *attr, \
	char *buf) \
	{ \
	return show_sys_hwmon(_set, buf); \
	} \
	static ssize_t store_##_name(struct device *dev, \
	struct device_attribute *attr, \
	const char *buf, size_t count) \
	{ \
	return store_sys_hwmon(_get, buf, count); \
	} \
	static SENSOR_DEVICE_ATTR(_name, _mode, show_##_name, store_##_name, 0);

	EEEPC_CREATE_SENSOR_ATTR(fan1_input, S_IRUGO, eeepc_get_fan_rpm, NULL);
	EEEPC_CREATE_SENSOR_ATTR(pwm1, S_IRUGO \| S_IWUSR,
	eeepc_get_fan_pwm, eeepc_set_fan_pwm);
	EEEPC_CREATE_SENSOR_ATTR(pwm1_enable, S_IRUGO \| S_IWUSR,
	eeepc_get_fan_ctrl, eeepc_set_fan_ctrl);

	static ssize_t
	show_name(struct device dev, struct device_attribute attr, char *buf)
	{
	return sprintf(buf, "eeepc\n");
	}
	static SENSOR_DEVICE_ATTR(name, S_IRUGO, show_name, NULL, 0);

	static struct attribute *hwmon_attributes[] = {
	&sensor_dev_attr_pwm1.dev_attr.attr,
	&sensor_dev_attr_fan1_input.dev_attr.attr,
	&sensor_dev_attr_pwm1_enable.dev_attr.attr,
	&sensor_dev_attr_name.dev_attr.attr,
	NULL
	};

	static struct attribute_group hwmon_attribute_group = {
	.attrs = hwmon_attributes
	};

	/*
	* exit/init
	*/
	static void eeepc_backlight_exit(void)
	{
	if (eeepc_backlight_device)
	backlight_device_unregister(eeepc_backlight_device);
	eeepc_backlight_device = NULL;
	}

	static void eeepc_hwmon_exit(void)
	{
	struct device *hwmon;

	hwmon = eeepc_hwmon_device;
	if (!hwmon)
	return ;
	sysfs_remove_group(&hwmon->kobj,
	&hwmon_attribute_group);
	hwmon_device_unregister(hwmon);
	eeepc_hwmon_device = NULL;
	}

	static void __exit eeepc_laptop_exit(void)
	{
	eeepc_backlight_exit();
	eeepc_hwmon_exit();
	acpi_bus_unregister_driver(&eeepc_hotk_driver);
	sysfs_remove_group(&platform_device->dev.kobj,
	&platform_attribute_group);
	platform_device_unregister(platform_device);
	platform_driver_unregister(&platform_driver);
	}

	static int eeepc_backlight_init(struct device *dev)
	{
	struct backlight_device *bd;

	bd = backlight_device_register(EEEPC_HOTK_FILE, dev,
	NULL, &eeepcbl_ops);
	if (IS_ERR(bd)) {
	printk(EEEPC_ERR
	"Could not register eeepc backlight device\n");
	eeepc_backlight_device = NULL;
	return PTR_ERR(bd);
	}
	eeepc_backlight_device = bd;
	bd->props.max_brightness = 15;
	bd->props.brightness = read_brightness(NULL);
	bd->props.power = FB_BLANK_UNBLANK;
	backlight_update_status(bd);
	return 0;
	}

	static int eeepc_hwmon_init(struct device *dev)
	{
	struct device *hwmon;
	int result;

	hwmon = hwmon_device_register(dev);
	if (IS_ERR(hwmon)) {
	printk(EEEPC_ERR
	"Could not register eeepc hwmon device\n");
	eeepc_hwmon_device = NULL;
	return PTR_ERR(hwmon);
	}
	eeepc_hwmon_device = hwmon;
	result = sysfs_create_group(&hwmon->kobj,
	&hwmon_attribute_group);
	if (result)
	eeepc_hwmon_exit();
	return result;
	}

	static int __init eeepc_laptop_init(void)
	{
	struct device *dev;
	int result;

	if (acpi_disabled)
	return -ENODEV;
	result = acpi_bus_register_driver(&eeepc_hotk_driver);
	if (result < 0)
	return result;
	if (!ehotk) {
	acpi_bus_unregister_driver(&eeepc_hotk_driver);
	return -ENODEV;
	}
	dev = acpi_get_physical_device(ehotk->device->handle);
	result = eeepc_backlight_init(dev);
	if (result)
	goto fail_backlight;
	result = eeepc_hwmon_init(dev);
	if (result)
	goto fail_hwmon;
	/* Register platform stuff */
	result = platform_driver_register(&platform_driver);
	if (result)
	goto fail_platform_driver;
	platform_device = platform_device_alloc(EEEPC_HOTK_FILE, -1);
	if (!platform_device) {
	result = -ENOMEM;
	goto fail_platform_device1;
	}
	result = platform_device_add(platform_device);
	if (result)
	goto fail_platform_device2;
	result = sysfs_create_group(&platform_device->dev.kobj,
	&platform_attribute_group);
	if (result)
	goto fail_sysfs;
	return 0;
	fail_sysfs:
	platform_device_del(platform_device);
	fail_platform_device2:
	platform_device_put(platform_device);
	fail_platform_device1:
	platform_driver_unregister(&platform_driver);
	fail_platform_driver:
	eeepc_hwmon_exit();
	fail_hwmon:
	eeepc_backlight_exit();
	fail_backlight:
	return result;
	}

	module_init(eeepc_laptop_init);
	module_exit(eeepc_laptop_exit);