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Commit cb6ecf6f7afece066265e243657b0ac28150a7b2

Authored by Henrik Rydberg 2010-01-29 14:28:27 +0800

Committed by Dmitry Torokhov 2010-01-29 14:32:45 +0800

Exists in master and in 7 other branches

Input: add the ABS_MT_PRESSURE event

For pressure-based multi-touch devices, a direct way to send sensor
intensity data per finger is needed. This patch adds the ABS_MT_PRESSURE
event to the MT protocol.

Requested-by: Yoonyoung Shim <jy0922.shim@samsung.com>
Requested-by: Mika Kuoppala <mika.kuoppala@nokia.com>
Requested-by: Peter Hutterer <peter.hutterer@who-t.net>
Signed-off-by: Henrik Rydberg <rydberg@euromail.se>
Signed-off-by: Dmitry Torokhov <dtor@mail.ru>

Showing 2 changed files with 2 additions and 0 deletions Inline Diff

drivers/input/input.c
include/linux/input.h

drivers/input/input.c

Diff comments View file @ cb6ecf6

 /*
  * The input core
  *
  * Copyright (c) 1999-2002 Vojtech Pavlik
  */
 /*
  * This program is free software; you can redistribute it and/or modify it
  * under the terms of the GNU General Public License version 2 as published by
  * the Free Software Foundation.
  */
 #include <linux/init.h>
 #include <linux/types.h>
 #include <linux/input.h>
 #include <linux/module.h>
 #include <linux/random.h>
 #include <linux/major.h>
 #include <linux/proc_fs.h>
 #include <linux/sched.h>
 #include <linux/seq_file.h>
 #include <linux/poll.h>
 #include <linux/device.h>
 #include <linux/mutex.h>
 #include <linux/rcupdate.h>
 #include <linux/smp_lock.h>
 #include "input-compat.h"
 MODULE_AUTHOR("Vojtech Pavlik <vojtech@suse.cz>");
 MODULE_DESCRIPTION("Input core");
 MODULE_LICENSE("GPL");
 #define INPUT_DEVICES	256
 /*
  * EV_ABS events which should not be cached are listed here.
  */
 static unsigned int input_abs_bypass_init_data[] __initdata = {
 	ABS_MT_TOUCH_MAJOR,
 	ABS_MT_TOUCH_MINOR,
 	ABS_MT_WIDTH_MAJOR,
 	ABS_MT_WIDTH_MINOR,
 	ABS_MT_ORIENTATION,
 	ABS_MT_POSITION_X,
 	ABS_MT_POSITION_Y,
 	ABS_MT_TOOL_TYPE,
 	ABS_MT_BLOB_ID,
 	ABS_MT_TRACKING_ID,
+	ABS_MT_PRESSURE,
 	0
 };
 static unsigned long input_abs_bypass[BITS_TO_LONGS(ABS_CNT)];
 static LIST_HEAD(input_dev_list);
 static LIST_HEAD(input_handler_list);
 /*
  * input_mutex protects access to both input_dev_list and input_handler_list.
  * This also causes input_[un]register_device and input_[un]register_handler
  * be mutually exclusive which simplifies locking in drivers implementing
  * input handlers.
  */
 static DEFINE_MUTEX(input_mutex);
 static struct input_handler *input_table[8];
 static inline int is_event_supported(unsigned int code,
 				     unsigned long *bm, unsigned int max)
 {
 	return code <= max && test_bit(code, bm);
 }
 static int input_defuzz_abs_event(int value, int old_val, int fuzz)
 {
 	if (fuzz) {
 		if (value > old_val - fuzz / 2 && value < old_val + fuzz / 2)
 			return old_val;
 		if (value > old_val - fuzz && value < old_val + fuzz)
 			return (old_val * 3 + value) / 4;
 		if (value > old_val - fuzz * 2 && value < old_val + fuzz * 2)
 			return (old_val + value) / 2;
 	}
 	return value;
 }
 /*
  * Pass event through all open handles. This function is called with
  * dev->event_lock held and interrupts disabled.
  */
 static void input_pass_event(struct input_dev *dev,
 			     unsigned int type, unsigned int code, int value)
 {
 	struct input_handle *handle;
 	rcu_read_lock();
 	handle = rcu_dereference(dev->grab);
 	if (handle)
 		handle->handler->event(handle, type, code, value);
 	else
 		list_for_each_entry_rcu(handle, &dev->h_list, d_node)
 			if (handle->open)
 				handle->handler->event(handle,
 							type, code, value);
 	rcu_read_unlock();
 }
 /*
  * Generate software autorepeat event. Note that we take
  * dev->event_lock here to avoid racing with input_event
  * which may cause keys get "stuck".
  */
 static void input_repeat_key(unsigned long data)
 {
 	struct input_dev *dev = (void *) data;
 	unsigned long flags;
 	spin_lock_irqsave(&dev->event_lock, flags);
 	if (test_bit(dev->repeat_key, dev->key) &&
 	    is_event_supported(dev->repeat_key, dev->keybit, KEY_MAX)) {
 		input_pass_event(dev, EV_KEY, dev->repeat_key, 2);
 		if (dev->sync) {
 			/*
 			 * Only send SYN_REPORT if we are not in a middle
 			 * of driver parsing a new hardware packet.
 			 * Otherwise assume that the driver will send
 			 * SYN_REPORT once it's done.
 			 */
 			input_pass_event(dev, EV_SYN, SYN_REPORT, 1);
 		}
 		if (dev->rep[REP_PERIOD])
 			mod_timer(&dev->timer, jiffies +
 					msecs_to_jiffies(dev->rep[REP_PERIOD]));
 	}
 	spin_unlock_irqrestore(&dev->event_lock, flags);
 }
 static void input_start_autorepeat(struct input_dev *dev, int code)
 {
 	if (test_bit(EV_REP, dev->evbit) &&
 	    dev->rep[REP_PERIOD] && dev->rep[REP_DELAY] &&
 	    dev->timer.data) {
 		dev->repeat_key = code;
 		mod_timer(&dev->timer,
 			  jiffies + msecs_to_jiffies(dev->rep[REP_DELAY]));
 	}
 }
 static void input_stop_autorepeat(struct input_dev *dev)
 {
 	del_timer(&dev->timer);
 }
 #define INPUT_IGNORE_EVENT	0
 #define INPUT_PASS_TO_HANDLERS	1
 #define INPUT_PASS_TO_DEVICE	2
 #define INPUT_PASS_TO_ALL	(INPUT_PASS_TO_HANDLERS | INPUT_PASS_TO_DEVICE)
 static void input_handle_event(struct input_dev *dev,
 			       unsigned int type, unsigned int code, int value)
 {
 	int disposition = INPUT_IGNORE_EVENT;
 	switch (type) {
 	case EV_SYN:
 		switch (code) {
 		case SYN_CONFIG:
 			disposition = INPUT_PASS_TO_ALL;
 			break;
 		case SYN_REPORT:
 			if (!dev->sync) {
 				dev->sync = 1;
 				disposition = INPUT_PASS_TO_HANDLERS;
 			}
 			break;
 		case SYN_MT_REPORT:
 			dev->sync = 0;
 			disposition = INPUT_PASS_TO_HANDLERS;
 			break;
 		}
 		break;
 	case EV_KEY:
 		if (is_event_supported(code, dev->keybit, KEY_MAX) &&
 		    !!test_bit(code, dev->key) != value) {
 			if (value != 2) {
 				__change_bit(code, dev->key);
 				if (value)
 					input_start_autorepeat(dev, code);
 				else
 					input_stop_autorepeat(dev);
 			}
 			disposition = INPUT_PASS_TO_HANDLERS;
 		}
 		break;
 	case EV_SW:
 		if (is_event_supported(code, dev->swbit, SW_MAX) &&
 		    !!test_bit(code, dev->sw) != value) {
 			__change_bit(code, dev->sw);
 			disposition = INPUT_PASS_TO_HANDLERS;
 		}
 		break;
 	case EV_ABS:
 		if (is_event_supported(code, dev->absbit, ABS_MAX)) {
 			if (test_bit(code, input_abs_bypass)) {
 				disposition = INPUT_PASS_TO_HANDLERS;
 				break;
 			}
 			value = input_defuzz_abs_event(value,
 					dev->abs[code], dev->absfuzz[code]);
 			if (dev->abs[code] != value) {
 				dev->abs[code] = value;
 				disposition = INPUT_PASS_TO_HANDLERS;
 			}
 		}
 		break;
 	case EV_REL:
 		if (is_event_supported(code, dev->relbit, REL_MAX) && value)
 			disposition = INPUT_PASS_TO_HANDLERS;
 		break;
 	case EV_MSC:
 		if (is_event_supported(code, dev->mscbit, MSC_MAX))
 			disposition = INPUT_PASS_TO_ALL;
 		break;
 	case EV_LED:
 		if (is_event_supported(code, dev->ledbit, LED_MAX) &&
 		    !!test_bit(code, dev->led) != value) {
 			__change_bit(code, dev->led);
 			disposition = INPUT_PASS_TO_ALL;
 		}
 		break;
 	case EV_SND:
 		if (is_event_supported(code, dev->sndbit, SND_MAX)) {
 			if (!!test_bit(code, dev->snd) != !!value)
 				__change_bit(code, dev->snd);
 			disposition = INPUT_PASS_TO_ALL;
 		}
 		break;
 	case EV_REP:
 		if (code <= REP_MAX && value >= 0 && dev->rep[code] != value) {
 			dev->rep[code] = value;
 			disposition = INPUT_PASS_TO_ALL;
 		}
 		break;
 	case EV_FF:
 		if (value >= 0)
 			disposition = INPUT_PASS_TO_ALL;
 		break;
 	case EV_PWR:
 		disposition = INPUT_PASS_TO_ALL;
 		break;
 	}
 	if (disposition != INPUT_IGNORE_EVENT && type != EV_SYN)
 		dev->sync = 0;
 	if ((disposition & INPUT_PASS_TO_DEVICE) && dev->event)
 		dev->event(dev, type, code, value);
 	if (disposition & INPUT_PASS_TO_HANDLERS)
 		input_pass_event(dev, type, code, value);
 }
 /**
  * input_event() - report new input event
  * @dev: device that generated the event
  * @type: type of the event
  * @code: event code
  * @value: value of the event
  *
  * This function should be used by drivers implementing various input
  * devices to report input events. See also input_inject_event().
  *
  * NOTE: input_event() may be safely used right after input device was
  * allocated with input_allocate_device(), even before it is registered
  * with input_register_device(), but the event will not reach any of the
  * input handlers. Such early invocation of input_event() may be used
  * to 'seed' initial state of a switch or initial position of absolute
  * axis, etc.
  */
 void input_event(struct input_dev *dev,
 		 unsigned int type, unsigned int code, int value)
 {
 	unsigned long flags;
 	if (is_event_supported(type, dev->evbit, EV_MAX)) {
 		spin_lock_irqsave(&dev->event_lock, flags);
 		add_input_randomness(type, code, value);
 		input_handle_event(dev, type, code, value);
 		spin_unlock_irqrestore(&dev->event_lock, flags);
 	}
 }
 EXPORT_SYMBOL(input_event);
 /**
  * input_inject_event() - send input event from input handler
  * @handle: input handle to send event through
  * @type: type of the event
  * @code: event code
  * @value: value of the event
  *
  * Similar to input_event() but will ignore event if device is
  * "grabbed" and handle injecting event is not the one that owns
  * the device.
  */
 void input_inject_event(struct input_handle *handle,
 			unsigned int type, unsigned int code, int value)
 {
 	struct input_dev *dev = handle->dev;
 	struct input_handle *grab;
 	unsigned long flags;
 	if (is_event_supported(type, dev->evbit, EV_MAX)) {
 		spin_lock_irqsave(&dev->event_lock, flags);
 		rcu_read_lock();
 		grab = rcu_dereference(dev->grab);
 		if (!grab || grab == handle)
 			input_handle_event(dev, type, code, value);
 		rcu_read_unlock();
 		spin_unlock_irqrestore(&dev->event_lock, flags);
 	}
 }
 EXPORT_SYMBOL(input_inject_event);
 /**
  * input_grab_device - grabs device for exclusive use
  * @handle: input handle that wants to own the device
  *
  * When a device is grabbed by an input handle all events generated by
  * the device are delivered only to this handle. Also events injected
  * by other input handles are ignored while device is grabbed.
  */
 int input_grab_device(struct input_handle *handle)
 {
 	struct input_dev *dev = handle->dev;
 	int retval;
 	retval = mutex_lock_interruptible(&dev->mutex);
 	if (retval)
 		return retval;
 	if (dev->grab) {
 		retval = -EBUSY;
 		goto out;
 	}
 	rcu_assign_pointer(dev->grab, handle);
 	synchronize_rcu();
  out:
 	mutex_unlock(&dev->mutex);
 	return retval;
 }
 EXPORT_SYMBOL(input_grab_device);
 static void __input_release_device(struct input_handle *handle)
 {
 	struct input_dev *dev = handle->dev;
 	if (dev->grab == handle) {
 		rcu_assign_pointer(dev->grab, NULL);
 		/* Make sure input_pass_event() notices that grab is gone */
 		synchronize_rcu();
 		list_for_each_entry(handle, &dev->h_list, d_node)
 			if (handle->open && handle->handler->start)
 				handle->handler->start(handle);
 	}
 }
 /**
  * input_release_device - release previously grabbed device
  * @handle: input handle that owns the device
  *
  * Releases previously grabbed device so that other input handles can
  * start receiving input events. Upon release all handlers attached
  * to the device have their start() method called so they have a change
  * to synchronize device state with the rest of the system.
  */
 void input_release_device(struct input_handle *handle)
 {
 	struct input_dev *dev = handle->dev;
 	mutex_lock(&dev->mutex);
 	__input_release_device(handle);
 	mutex_unlock(&dev->mutex);
 }
 EXPORT_SYMBOL(input_release_device);
 /**
  * input_open_device - open input device
  * @handle: handle through which device is being accessed
  *
  * This function should be called by input handlers when they
  * want to start receive events from given input device.
  */
 int input_open_device(struct input_handle *handle)
 {
 	struct input_dev *dev = handle->dev;
 	int retval;
 	retval = mutex_lock_interruptible(&dev->mutex);
 	if (retval)
 		return retval;
 	if (dev->going_away) {
 		retval = -ENODEV;
 		goto out;
 	}
 	handle->open++;
 	if (!dev->users++ && dev->open)
 		retval = dev->open(dev);
 	if (retval) {
 		dev->users--;
 		if (!--handle->open) {
 			/*
 			 * Make sure we are not delivering any more events
 			 * through this handle
 			 */
 			synchronize_rcu();
 		}
 	}
  out:
 	mutex_unlock(&dev->mutex);
 	return retval;
 }
 EXPORT_SYMBOL(input_open_device);
 int input_flush_device(struct input_handle *handle, struct file *file)
 {
 	struct input_dev *dev = handle->dev;
 	int retval;
 	retval = mutex_lock_interruptible(&dev->mutex);
 	if (retval)
 		return retval;
 	if (dev->flush)
 		retval = dev->flush(dev, file);
 	mutex_unlock(&dev->mutex);
 	return retval;
 }
 EXPORT_SYMBOL(input_flush_device);
 /**
  * input_close_device - close input device
  * @handle: handle through which device is being accessed
  *
  * This function should be called by input handlers when they
  * want to stop receive events from given input device.
  */
 void input_close_device(struct input_handle *handle)
 {
 	struct input_dev *dev = handle->dev;
 	mutex_lock(&dev->mutex);
 	__input_release_device(handle);
 	if (!--dev->users && dev->close)
 		dev->close(dev);
 	if (!--handle->open) {
 		/*
 		 * synchronize_rcu() makes sure that input_pass_event()
 		 * completed and that no more input events are delivered
 		 * through this handle
 		 */
 		synchronize_rcu();
 	}
 	mutex_unlock(&dev->mutex);
 }
 EXPORT_SYMBOL(input_close_device);
 /*
  * Prepare device for unregistering
  */
 static void input_disconnect_device(struct input_dev *dev)
 {
 	struct input_handle *handle;
 	int code;
 	/*
 	 * Mark device as going away. Note that we take dev->mutex here
 	 * not to protect access to dev->going_away but rather to ensure
 	 * that there are no threads in the middle of input_open_device()
 	 */
 	mutex_lock(&dev->mutex);
 	dev->going_away = true;
 	mutex_unlock(&dev->mutex);
 	spin_lock_irq(&dev->event_lock);
 	/*
 	 * Simulate keyup events for all pressed keys so that handlers
 	 * are not left with "stuck" keys. The driver may continue
 	 * generate events even after we done here but they will not
 	 * reach any handlers.
 	 */
 	if (is_event_supported(EV_KEY, dev->evbit, EV_MAX)) {
 		for (code = 0; code <= KEY_MAX; code++) {
 			if (is_event_supported(code, dev->keybit, KEY_MAX) &&
 			    __test_and_clear_bit(code, dev->key)) {
 				input_pass_event(dev, EV_KEY, code, 0);
 			}
 		}
 		input_pass_event(dev, EV_SYN, SYN_REPORT, 1);
 	}
 	list_for_each_entry(handle, &dev->h_list, d_node)
 		handle->open = 0;
 	spin_unlock_irq(&dev->event_lock);
 }
 static int input_fetch_keycode(struct input_dev *dev, int scancode)
 {
 	switch (dev->keycodesize) {
 		case 1:
 			return ((u8 *)dev->keycode)[scancode];
 		case 2:
 			return ((u16 *)dev->keycode)[scancode];
 		default:
 			return ((u32 *)dev->keycode)[scancode];
 	}
 }
 static int input_default_getkeycode(struct input_dev *dev,
 				    int scancode, int *keycode)
 {
 	if (!dev->keycodesize)
 		return -EINVAL;
 	if (scancode >= dev->keycodemax)
 		return -EINVAL;
 	*keycode = input_fetch_keycode(dev, scancode);
 	return 0;
 }
 static int input_default_setkeycode(struct input_dev *dev,
 				    int scancode, int keycode)
 {
 	int old_keycode;
 	int i;
 	if (scancode >= dev->keycodemax)
 		return -EINVAL;
 	if (!dev->keycodesize)
 		return -EINVAL;
 	if (dev->keycodesize < sizeof(keycode) && (keycode >> (dev->keycodesize * 8)))
 		return -EINVAL;
 	switch (dev->keycodesize) {
 		case 1: {
 			u8 *k = (u8 *)dev->keycode;
 			old_keycode = k[scancode];
 			k[scancode] = keycode;
 			break;
 		}
 		case 2: {
 			u16 *k = (u16 *)dev->keycode;
 			old_keycode = k[scancode];
 			k[scancode] = keycode;
 			break;
 		}
 		default: {
 			u32 *k = (u32 *)dev->keycode;
 			old_keycode = k[scancode];
 			k[scancode] = keycode;
 			break;
 		}
 	}
 	clear_bit(old_keycode, dev->keybit);
 	set_bit(keycode, dev->keybit);
 	for (i = 0; i < dev->keycodemax; i++) {
 		if (input_fetch_keycode(dev, i) == old_keycode) {
 			set_bit(old_keycode, dev->keybit);
 			break; /* Setting the bit twice is useless, so break */
 		}
 	}
 	return 0;
 }
 /**
  * input_get_keycode - retrieve keycode currently mapped to a given scancode
  * @dev: input device which keymap is being queried
  * @scancode: scancode (or its equivalent for device in question) for which
  *	keycode is needed
  * @keycode: result
  *
  * This function should be called by anyone interested in retrieving current
  * keymap. Presently keyboard and evdev handlers use it.
  */
 int input_get_keycode(struct input_dev *dev, int scancode, int *keycode)
 {
 	if (scancode < 0)
 		return -EINVAL;
 	return dev->getkeycode(dev, scancode, keycode);
 }
 EXPORT_SYMBOL(input_get_keycode);
 /**
  * input_get_keycode - assign new keycode to a given scancode
  * @dev: input device which keymap is being updated
  * @scancode: scancode (or its equivalent for device in question)
  * @keycode: new keycode to be assigned to the scancode
  *
  * This function should be called by anyone needing to update current
  * keymap. Presently keyboard and evdev handlers use it.
  */
 int input_set_keycode(struct input_dev *dev, int scancode, int keycode)
 {
 	unsigned long flags;
 	int old_keycode;
 	int retval;
 	if (scancode < 0)
 		return -EINVAL;
 	if (keycode < 0 || keycode > KEY_MAX)
 		return -EINVAL;
 	spin_lock_irqsave(&dev->event_lock, flags);
 	retval = dev->getkeycode(dev, scancode, &old_keycode);
 	if (retval)
 		goto out;
 	retval = dev->setkeycode(dev, scancode, keycode);
 	if (retval)
 		goto out;
 	/*
 	 * Simulate keyup event if keycode is not present
 	 * in the keymap anymore
 	 */
 	if (test_bit(EV_KEY, dev->evbit) &&
 	    !is_event_supported(old_keycode, dev->keybit, KEY_MAX) &&
 	    __test_and_clear_bit(old_keycode, dev->key)) {
 		input_pass_event(dev, EV_KEY, old_keycode, 0);
 		if (dev->sync)
 			input_pass_event(dev, EV_SYN, SYN_REPORT, 1);
 	}
  out:
 	spin_unlock_irqrestore(&dev->event_lock, flags);
 	return retval;
 }
 EXPORT_SYMBOL(input_set_keycode);
 #define MATCH_BIT(bit, max) \
 		for (i = 0; i < BITS_TO_LONGS(max); i++) \
 			if ((id->bit[i] & dev->bit[i]) != id->bit[i]) \
 				break; \
 		if (i != BITS_TO_LONGS(max)) \
 			continue;
 static const struct input_device_id *input_match_device(const struct input_device_id *id,
 							struct input_dev *dev)
 {
 	int i;
 	for (; id->flags || id->driver_info; id++) {
 		if (id->flags & INPUT_DEVICE_ID_MATCH_BUS)
 			if (id->bustype != dev->id.bustype)
 				continue;
 		if (id->flags & INPUT_DEVICE_ID_MATCH_VENDOR)
 			if (id->vendor != dev->id.vendor)
 				continue;
 		if (id->flags & INPUT_DEVICE_ID_MATCH_PRODUCT)
 			if (id->product != dev->id.product)
 				continue;
 		if (id->flags & INPUT_DEVICE_ID_MATCH_VERSION)
 			if (id->version != dev->id.version)
 				continue;
 		MATCH_BIT(evbit,  EV_MAX);
 		MATCH_BIT(keybit, KEY_MAX);
 		MATCH_BIT(relbit, REL_MAX);
 		MATCH_BIT(absbit, ABS_MAX);
 		MATCH_BIT(mscbit, MSC_MAX);
 		MATCH_BIT(ledbit, LED_MAX);
 		MATCH_BIT(sndbit, SND_MAX);
 		MATCH_BIT(ffbit,  FF_MAX);
 		MATCH_BIT(swbit,  SW_MAX);
 		return id;
 	}
 	return NULL;
 }
 static int input_attach_handler(struct input_dev *dev, struct input_handler *handler)
 {
 	const struct input_device_id *id;
 	int error;
 	if (handler->blacklist && input_match_device(handler->blacklist, dev))
 		return -ENODEV;
 	id = input_match_device(handler->id_table, dev);
 	if (!id)
 		return -ENODEV;
 	error = handler->connect(handler, dev, id);
 	if (error && error != -ENODEV)
 		printk(KERN_ERR
 			"input: failed to attach handler %s to device %s, "
 			"error: %d\n",
 			handler->name, kobject_name(&dev->dev.kobj), error);
 	return error;
 }
 #ifdef CONFIG_COMPAT
 static int input_bits_to_string(char *buf, int buf_size,
 				unsigned long bits, bool skip_empty)
 {
 	int len = 0;
 	if (INPUT_COMPAT_TEST) {
 		u32 dword = bits >> 32;
 		if (dword || !skip_empty)
 			len += snprintf(buf, buf_size, "%x ", dword);
 		dword = bits & 0xffffffffUL;
 		if (dword || !skip_empty || len)
 			len += snprintf(buf + len, max(buf_size - len, 0),
 					"%x", dword);
 	} else {
 		if (bits || !skip_empty)
 			len += snprintf(buf, buf_size, "%lx", bits);
 	}
 	return len;
 }
 #else /* !CONFIG_COMPAT */
 static int input_bits_to_string(char *buf, int buf_size,
 				unsigned long bits, bool skip_empty)
 {
 	return bits || !skip_empty ?
 		snprintf(buf, buf_size, "%lx", bits) : 0;
 }
 #endif
 #ifdef CONFIG_PROC_FS
 static struct proc_dir_entry *proc_bus_input_dir;
 static DECLARE_WAIT_QUEUE_HEAD(input_devices_poll_wait);
 static int input_devices_state;
 static inline void input_wakeup_procfs_readers(void)
 {
 	input_devices_state++;
 	wake_up(&input_devices_poll_wait);
 }
 static unsigned int input_proc_devices_poll(struct file *file, poll_table *wait)
 {
 	poll_wait(file, &input_devices_poll_wait, wait);
 	if (file->f_version != input_devices_state) {
 		file->f_version = input_devices_state;
 		return POLLIN | POLLRDNORM;
 	}
 	return 0;
 }
 union input_seq_state {
 	struct {
 		unsigned short pos;
 		bool mutex_acquired;
 	};
 	void *p;
 };
 static void *input_devices_seq_start(struct seq_file *seq, loff_t *pos)
 {
 	union input_seq_state *state = (union input_seq_state *)&seq->private;
 	int error;
 	/* We need to fit into seq->private pointer */
 	BUILD_BUG_ON(sizeof(union input_seq_state) != sizeof(seq->private));
 	error = mutex_lock_interruptible(&input_mutex);
 	if (error) {
 		state->mutex_acquired = false;
 		return ERR_PTR(error);
 	}
 	state->mutex_acquired = true;
 	return seq_list_start(&input_dev_list, *pos);
 }
 static void *input_devices_seq_next(struct seq_file *seq, void *v, loff_t *pos)
 {
 	return seq_list_next(v, &input_dev_list, pos);
 }
 static void input_seq_stop(struct seq_file *seq, void *v)
 {
 	union input_seq_state *state = (union input_seq_state *)&seq->private;
 	if (state->mutex_acquired)
 		mutex_unlock(&input_mutex);
 }
 static void input_seq_print_bitmap(struct seq_file *seq, const char *name,
 				   unsigned long *bitmap, int max)
 {
 	int i;
 	bool skip_empty = true;
 	char buf[18];
 	seq_printf(seq, "B: %s=", name);
 	for (i = BITS_TO_LONGS(max) - 1; i >= 0; i--) {
 		if (input_bits_to_string(buf, sizeof(buf),
 					 bitmap[i], skip_empty)) {
 			skip_empty = false;
 			seq_printf(seq, "%s%s", buf, i > 0 ? " " : "");
 		}
 	}
 	/*
 	 * If no output was produced print a single 0.
 	 */
 	if (skip_empty)
 		seq_puts(seq, "0");
 	seq_putc(seq, '\n');
 }
 static int input_devices_seq_show(struct seq_file *seq, void *v)
 {
 	struct input_dev *dev = container_of(v, struct input_dev, node);
 	const char *path = kobject_get_path(&dev->dev.kobj, GFP_KERNEL);
 	struct input_handle *handle;
 	seq_printf(seq, "I: Bus=%04x Vendor=%04x Product=%04x Version=%04x\n",
 		   dev->id.bustype, dev->id.vendor, dev->id.product, dev->id.version);
 	seq_printf(seq, "N: Name=\"%s\"\n", dev->name ? dev->name : "");
 	seq_printf(seq, "P: Phys=%s\n", dev->phys ? dev->phys : "");
 	seq_printf(seq, "S: Sysfs=%s\n", path ? path : "");
 	seq_printf(seq, "U: Uniq=%s\n", dev->uniq ? dev->uniq : "");
 	seq_printf(seq, "H: Handlers=");
 	list_for_each_entry(handle, &dev->h_list, d_node)
 		seq_printf(seq, "%s ", handle->name);
 	seq_putc(seq, '\n');
 	input_seq_print_bitmap(seq, "EV", dev->evbit, EV_MAX);
 	if (test_bit(EV_KEY, dev->evbit))
 		input_seq_print_bitmap(seq, "KEY", dev->keybit, KEY_MAX);
 	if (test_bit(EV_REL, dev->evbit))
 		input_seq_print_bitmap(seq, "REL", dev->relbit, REL_MAX);
 	if (test_bit(EV_ABS, dev->evbit))
 		input_seq_print_bitmap(seq, "ABS", dev->absbit, ABS_MAX);
 	if (test_bit(EV_MSC, dev->evbit))
 		input_seq_print_bitmap(seq, "MSC", dev->mscbit, MSC_MAX);
 	if (test_bit(EV_LED, dev->evbit))
 		input_seq_print_bitmap(seq, "LED", dev->ledbit, LED_MAX);
 	if (test_bit(EV_SND, dev->evbit))
 		input_seq_print_bitmap(seq, "SND", dev->sndbit, SND_MAX);
 	if (test_bit(EV_FF, dev->evbit))
 		input_seq_print_bitmap(seq, "FF", dev->ffbit, FF_MAX);
 	if (test_bit(EV_SW, dev->evbit))
 		input_seq_print_bitmap(seq, "SW", dev->swbit, SW_MAX);
 	seq_putc(seq, '\n');
 	kfree(path);
 	return 0;
 }
 static const struct seq_operations input_devices_seq_ops = {
 	.start	= input_devices_seq_start,
 	.next	= input_devices_seq_next,
 	.stop	= input_seq_stop,
 	.show	= input_devices_seq_show,
 };
 static int input_proc_devices_open(struct inode *inode, struct file *file)
 {
 	return seq_open(file, &input_devices_seq_ops);
 }
 static const struct file_operations input_devices_fileops = {
 	.owner		= THIS_MODULE,
 	.open		= input_proc_devices_open,
 	.poll		= input_proc_devices_poll,
 	.read		= seq_read,
 	.llseek		= seq_lseek,
 	.release	= seq_release,
 };
 static void *input_handlers_seq_start(struct seq_file *seq, loff_t *pos)
 {
 	union input_seq_state *state = (union input_seq_state *)&seq->private;
 	int error;
 	/* We need to fit into seq->private pointer */
 	BUILD_BUG_ON(sizeof(union input_seq_state) != sizeof(seq->private));
 	error = mutex_lock_interruptible(&input_mutex);
 	if (error) {
 		state->mutex_acquired = false;
 		return ERR_PTR(error);
 	}
 	state->mutex_acquired = true;
 	state->pos = *pos;
 	return seq_list_start(&input_handler_list, *pos);
 }
 static void *input_handlers_seq_next(struct seq_file *seq, void *v, loff_t *pos)
 {
 	union input_seq_state *state = (union input_seq_state *)&seq->private;
 	state->pos = *pos + 1;
 	return seq_list_next(v, &input_handler_list, pos);
 }
 static int input_handlers_seq_show(struct seq_file *seq, void *v)
 {
 	struct input_handler *handler = container_of(v, struct input_handler, node);
 	union input_seq_state *state = (union input_seq_state *)&seq->private;
 	seq_printf(seq, "N: Number=%u Name=%s", state->pos, handler->name);
 	if (handler->fops)
 		seq_printf(seq, " Minor=%d", handler->minor);
 	seq_putc(seq, '\n');
 	return 0;
 }
 static const struct seq_operations input_handlers_seq_ops = {
 	.start	= input_handlers_seq_start,
 	.next	= input_handlers_seq_next,
 	.stop	= input_seq_stop,
 	.show	= input_handlers_seq_show,
 };
 static int input_proc_handlers_open(struct inode *inode, struct file *file)
 {
 	return seq_open(file, &input_handlers_seq_ops);
 }
 static const struct file_operations input_handlers_fileops = {
 	.owner		= THIS_MODULE,
 	.open		= input_proc_handlers_open,
 	.read		= seq_read,
 	.llseek		= seq_lseek,
 	.release	= seq_release,
 };
 static int __init input_proc_init(void)
 {
 	struct proc_dir_entry *entry;
 	proc_bus_input_dir = proc_mkdir("bus/input", NULL);
 	if (!proc_bus_input_dir)
 		return -ENOMEM;
 	entry = proc_create("devices", 0, proc_bus_input_dir,
 			    &input_devices_fileops);
 	if (!entry)
 		goto fail1;
 	entry = proc_create("handlers", 0, proc_bus_input_dir,
 			    &input_handlers_fileops);
 	if (!entry)
 		goto fail2;
 	return 0;
  fail2:	remove_proc_entry("devices", proc_bus_input_dir);
  fail1: remove_proc_entry("bus/input", NULL);
 	return -ENOMEM;
 }
 static void input_proc_exit(void)
 {
 	remove_proc_entry("devices", proc_bus_input_dir);
 	remove_proc_entry("handlers", proc_bus_input_dir);
 	remove_proc_entry("bus/input", NULL);
 }
 #else /* !CONFIG_PROC_FS */
 static inline void input_wakeup_procfs_readers(void) { }
 static inline int input_proc_init(void) { return 0; }
 static inline void input_proc_exit(void) { }
 #endif
 #define INPUT_DEV_STRING_ATTR_SHOW(name)				\
 static ssize_t input_dev_show_##name(struct device *dev,		\
 				     struct device_attribute *attr,	\
 				     char *buf)				\
 {									\
 	struct input_dev *input_dev = to_input_dev(dev);		\
 									\
 	return scnprintf(buf, PAGE_SIZE, "%s\n",			\
 			 input_dev->name ? input_dev->name : "");	\
 }									\
 static DEVICE_ATTR(name, S_IRUGO, input_dev_show_##name, NULL)
 INPUT_DEV_STRING_ATTR_SHOW(name);
 INPUT_DEV_STRING_ATTR_SHOW(phys);
 INPUT_DEV_STRING_ATTR_SHOW(uniq);
 static int input_print_modalias_bits(char *buf, int size,
 				     char name, unsigned long *bm,
 				     unsigned int min_bit, unsigned int max_bit)
 {
 	int len = 0, i;
 	len += snprintf(buf, max(size, 0), "%c", name);
 	for (i = min_bit; i < max_bit; i++)
 		if (bm[BIT_WORD(i)] & BIT_MASK(i))
 			len += snprintf(buf + len, max(size - len, 0), "%X,", i);
 	return len;
 }
 static int input_print_modalias(char *buf, int size, struct input_dev *id,
 				int add_cr)
 {
 	int len;
 	len = snprintf(buf, max(size, 0),
 		       "input:b%04Xv%04Xp%04Xe%04X-",
 		       id->id.bustype, id->id.vendor,
 		       id->id.product, id->id.version);
 	len += input_print_modalias_bits(buf + len, size - len,
 				'e', id->evbit, 0, EV_MAX);
 	len += input_print_modalias_bits(buf + len, size - len,
 				'k', id->keybit, KEY_MIN_INTERESTING, KEY_MAX);
 	len += input_print_modalias_bits(buf + len, size - len,
 				'r', id->relbit, 0, REL_MAX);
 	len += input_print_modalias_bits(buf + len, size - len,
 				'a', id->absbit, 0, ABS_MAX);
 	len += input_print_modalias_bits(buf + len, size - len,
 				'm', id->mscbit, 0, MSC_MAX);
 	len += input_print_modalias_bits(buf + len, size - len,
 				'l', id->ledbit, 0, LED_MAX);
 	len += input_print_modalias_bits(buf + len, size - len,
 				's', id->sndbit, 0, SND_MAX);
 	len += input_print_modalias_bits(buf + len, size - len,
 				'f', id->ffbit, 0, FF_MAX);
 	len += input_print_modalias_bits(buf + len, size - len,
 				'w', id->swbit, 0, SW_MAX);
 	if (add_cr)
 		len += snprintf(buf + len, max(size - len, 0), "\n");
 	return len;
 }
 static ssize_t input_dev_show_modalias(struct device *dev,
 				       struct device_attribute *attr,
 				       char *buf)
 {
 	struct input_dev *id = to_input_dev(dev);
 	ssize_t len;
 	len = input_print_modalias(buf, PAGE_SIZE, id, 1);
 	return min_t(int, len, PAGE_SIZE);
 }
 static DEVICE_ATTR(modalias, S_IRUGO, input_dev_show_modalias, NULL);
 static struct attribute *input_dev_attrs[] = {
 	&dev_attr_name.attr,
 	&dev_attr_phys.attr,
 	&dev_attr_uniq.attr,
 	&dev_attr_modalias.attr,
 	NULL
 };
 static struct attribute_group input_dev_attr_group = {
 	.attrs	= input_dev_attrs,
 };
 #define INPUT_DEV_ID_ATTR(name)						\
 static ssize_t input_dev_show_id_##name(struct device *dev,		\
 					struct device_attribute *attr,	\
 					char *buf)			\
 {									\
 	struct input_dev *input_dev = to_input_dev(dev);		\
 	return scnprintf(buf, PAGE_SIZE, "%04x\n", input_dev->id.name);	\
 }									\
 static DEVICE_ATTR(name, S_IRUGO, input_dev_show_id_##name, NULL)
 INPUT_DEV_ID_ATTR(bustype);
 INPUT_DEV_ID_ATTR(vendor);
 INPUT_DEV_ID_ATTR(product);
 INPUT_DEV_ID_ATTR(version);
 static struct attribute *input_dev_id_attrs[] = {
 	&dev_attr_bustype.attr,
 	&dev_attr_vendor.attr,
 	&dev_attr_product.attr,
 	&dev_attr_version.attr,
 	NULL
 };
 static struct attribute_group input_dev_id_attr_group = {
 	.name	= "id",
 	.attrs	= input_dev_id_attrs,
 };
 static int input_print_bitmap(char *buf, int buf_size, unsigned long *bitmap,
 			      int max, int add_cr)
 {
 	int i;
 	int len = 0;
 	bool skip_empty = true;
 	for (i = BITS_TO_LONGS(max) - 1; i >= 0; i--) {
 		len += input_bits_to_string(buf + len, max(buf_size - len, 0),
 					    bitmap[i], skip_empty);
 		if (len) {
 			skip_empty = false;
 			if (i > 0)
 				len += snprintf(buf + len, max(buf_size - len, 0), " ");
 		}
 	}
 	/*
 	 * If no output was produced print a single 0.
 	 */
 	if (len == 0)
 		len = snprintf(buf, buf_size, "%d", 0);
 	if (add_cr)
 		len += snprintf(buf + len, max(buf_size - len, 0), "\n");
 	return len;
 }
 #define INPUT_DEV_CAP_ATTR(ev, bm)					\
 static ssize_t input_dev_show_cap_##bm(struct device *dev,		\
 				       struct device_attribute *attr,	\
 				       char *buf)			\
 {									\
 	struct input_dev *input_dev = to_input_dev(dev);		\
 	int len = input_print_bitmap(buf, PAGE_SIZE,			\
 				     input_dev->bm##bit, ev##_MAX,	\
 				     true);				\
 	return min_t(int, len, PAGE_SIZE);				\
 }									\
 static DEVICE_ATTR(bm, S_IRUGO, input_dev_show_cap_##bm, NULL)
 INPUT_DEV_CAP_ATTR(EV, ev);
 INPUT_DEV_CAP_ATTR(KEY, key);
 INPUT_DEV_CAP_ATTR(REL, rel);
 INPUT_DEV_CAP_ATTR(ABS, abs);
 INPUT_DEV_CAP_ATTR(MSC, msc);
 INPUT_DEV_CAP_ATTR(LED, led);
 INPUT_DEV_CAP_ATTR(SND, snd);
 INPUT_DEV_CAP_ATTR(FF, ff);
 INPUT_DEV_CAP_ATTR(SW, sw);
 static struct attribute *input_dev_caps_attrs[] = {
 	&dev_attr_ev.attr,
 	&dev_attr_key.attr,
 	&dev_attr_rel.attr,
 	&dev_attr_abs.attr,
 	&dev_attr_msc.attr,
 	&dev_attr_led.attr,
 	&dev_attr_snd.attr,
 	&dev_attr_ff.attr,
 	&dev_attr_sw.attr,
 	NULL
 };
 static struct attribute_group input_dev_caps_attr_group = {
 	.name	= "capabilities",
 	.attrs	= input_dev_caps_attrs,
 };
 static const struct attribute_group *input_dev_attr_groups[] = {
 	&input_dev_attr_group,
 	&input_dev_id_attr_group,
 	&input_dev_caps_attr_group,
 	NULL
 };
 static void input_dev_release(struct device *device)
 {
 	struct input_dev *dev = to_input_dev(device);
 	input_ff_destroy(dev);
 	kfree(dev);
 	module_put(THIS_MODULE);
 }
 /*
  * Input uevent interface - loading event handlers based on
  * device bitfields.
  */
 static int input_add_uevent_bm_var(struct kobj_uevent_env *env,
 				   const char *name, unsigned long *bitmap, int max)
 {
 	int len;
 	if (add_uevent_var(env, "%s=", name))
 		return -ENOMEM;
 	len = input_print_bitmap(&env->buf[env->buflen - 1],
 				 sizeof(env->buf) - env->buflen,
 				 bitmap, max, false);
 	if (len >= (sizeof(env->buf) - env->buflen))
 		return -ENOMEM;
 	env->buflen += len;
 	return 0;
 }
 static int input_add_uevent_modalias_var(struct kobj_uevent_env *env,
 					 struct input_dev *dev)
 {
 	int len;
 	if (add_uevent_var(env, "MODALIAS="))
 		return -ENOMEM;
 	len = input_print_modalias(&env->buf[env->buflen - 1],
 				   sizeof(env->buf) - env->buflen,
 				   dev, 0);
 	if (len >= (sizeof(env->buf) - env->buflen))
 		return -ENOMEM;
 	env->buflen += len;
 	return 0;
 }
 #define INPUT_ADD_HOTPLUG_VAR(fmt, val...)				\
 	do {								\
 		int err = add_uevent_var(env, fmt, val);		\
 		if (err)						\
 			return err;					\
 	} while (0)
 #define INPUT_ADD_HOTPLUG_BM_VAR(name, bm, max)				\
 	do {								\
 		int err = input_add_uevent_bm_var(env, name, bm, max);	\
 		if (err)						\
 			return err;					\
 	} while (0)
 #define INPUT_ADD_HOTPLUG_MODALIAS_VAR(dev)				\
 	do {								\
 		int err = input_add_uevent_modalias_var(env, dev);	\
 		if (err)						\
 			return err;					\
 	} while (0)
 static int input_dev_uevent(struct device *device, struct kobj_uevent_env *env)
 {
 	struct input_dev *dev = to_input_dev(device);
 	INPUT_ADD_HOTPLUG_VAR("PRODUCT=%x/%x/%x/%x",
 				dev->id.bustype, dev->id.vendor,
 				dev->id.product, dev->id.version);
 	if (dev->name)
 		INPUT_ADD_HOTPLUG_VAR("NAME=\"%s\"", dev->name);
 	if (dev->phys)
 		INPUT_ADD_HOTPLUG_VAR("PHYS=\"%s\"", dev->phys);
 	if (dev->uniq)
 		INPUT_ADD_HOTPLUG_VAR("UNIQ=\"%s\"", dev->uniq);
 	INPUT_ADD_HOTPLUG_BM_VAR("EV=", dev->evbit, EV_MAX);
 	if (test_bit(EV_KEY, dev->evbit))
 		INPUT_ADD_HOTPLUG_BM_VAR("KEY=", dev->keybit, KEY_MAX);
 	if (test_bit(EV_REL, dev->evbit))
 		INPUT_ADD_HOTPLUG_BM_VAR("REL=", dev->relbit, REL_MAX);
 	if (test_bit(EV_ABS, dev->evbit))
 		INPUT_ADD_HOTPLUG_BM_VAR("ABS=", dev->absbit, ABS_MAX);
 	if (test_bit(EV_MSC, dev->evbit))
 		INPUT_ADD_HOTPLUG_BM_VAR("MSC=", dev->mscbit, MSC_MAX);
 	if (test_bit(EV_LED, dev->evbit))
 		INPUT_ADD_HOTPLUG_BM_VAR("LED=", dev->ledbit, LED_MAX);
 	if (test_bit(EV_SND, dev->evbit))
 		INPUT_ADD_HOTPLUG_BM_VAR("SND=", dev->sndbit, SND_MAX);
 	if (test_bit(EV_FF, dev->evbit))
 		INPUT_ADD_HOTPLUG_BM_VAR("FF=", dev->ffbit, FF_MAX);
 	if (test_bit(EV_SW, dev->evbit))
 		INPUT_ADD_HOTPLUG_BM_VAR("SW=", dev->swbit, SW_MAX);
 	INPUT_ADD_HOTPLUG_MODALIAS_VAR(dev);
 	return 0;
 }
 #define INPUT_DO_TOGGLE(dev, type, bits, on)				\
 	do {								\
 		int i;							\
 		bool active;						\
 									\
 		if (!test_bit(EV_##type, dev->evbit))			\
 			break;						\
 									\
 		for (i = 0; i < type##_MAX; i++) {			\
 			if (!test_bit(i, dev->bits##bit))		\
 				continue;				\
 									\
 			active = test_bit(i, dev->bits);		\
 			if (!active && !on)				\
 				continue;				\
 									\
 			dev->event(dev, EV_##type, i, on ? active : 0);	\
 		}							\
 	} while (0)
 #ifdef CONFIG_PM
 static void input_dev_reset(struct input_dev *dev, bool activate)
 {
 	if (!dev->event)
 		return;
 	INPUT_DO_TOGGLE(dev, LED, led, activate);
 	INPUT_DO_TOGGLE(dev, SND, snd, activate);
 	if (activate && test_bit(EV_REP, dev->evbit)) {
 		dev->event(dev, EV_REP, REP_PERIOD, dev->rep[REP_PERIOD]);
 		dev->event(dev, EV_REP, REP_DELAY, dev->rep[REP_DELAY]);
 	}
 }
 static int input_dev_suspend(struct device *dev)
 {
 	struct input_dev *input_dev = to_input_dev(dev);
 	mutex_lock(&input_dev->mutex);
 	input_dev_reset(input_dev, false);
 	mutex_unlock(&input_dev->mutex);
 	return 0;
 }
 static int input_dev_resume(struct device *dev)
 {
 	struct input_dev *input_dev = to_input_dev(dev);
 	mutex_lock(&input_dev->mutex);
 	input_dev_reset(input_dev, true);
 	mutex_unlock(&input_dev->mutex);
 	return 0;
 }
 static const struct dev_pm_ops input_dev_pm_ops = {
 	.suspend	= input_dev_suspend,
 	.resume		= input_dev_resume,
 	.poweroff	= input_dev_suspend,
 	.restore	= input_dev_resume,
 };
 #endif /* CONFIG_PM */
 static struct device_type input_dev_type = {
 	.groups		= input_dev_attr_groups,
 	.release	= input_dev_release,
 	.uevent		= input_dev_uevent,
 #ifdef CONFIG_PM
 	.pm		= &input_dev_pm_ops,
 #endif
 };
 static char *input_devnode(struct device *dev, mode_t *mode)
 {
 	return kasprintf(GFP_KERNEL, "input/%s", dev_name(dev));
 }
 struct class input_class = {
 	.name		= "input",
 	.devnode	= input_devnode,
 };
 EXPORT_SYMBOL_GPL(input_class);
 /**
  * input_allocate_device - allocate memory for new input device
  *
  * Returns prepared struct input_dev or NULL.
  *
  * NOTE: Use input_free_device() to free devices that have not been
  * registered; input_unregister_device() should be used for already
  * registered devices.
  */
 struct input_dev *input_allocate_device(void)
 {
 	struct input_dev *dev;
 	dev = kzalloc(sizeof(struct input_dev), GFP_KERNEL);
 	if (dev) {
 		dev->dev.type = &input_dev_type;
 		dev->dev.class = &input_class;
 		device_initialize(&dev->dev);
 		mutex_init(&dev->mutex);
 		spin_lock_init(&dev->event_lock);
 		INIT_LIST_HEAD(&dev->h_list);
 		INIT_LIST_HEAD(&dev->node);
 		__module_get(THIS_MODULE);
 	}
 	return dev;
 }
 EXPORT_SYMBOL(input_allocate_device);
 /**
  * input_free_device - free memory occupied by input_dev structure
  * @dev: input device to free
  *
  * This function should only be used if input_register_device()
  * was not called yet or if it failed. Once device was registered
  * use input_unregister_device() and memory will be freed once last
  * reference to the device is dropped.
  *
  * Device should be allocated by input_allocate_device().
  *
  * NOTE: If there are references to the input device then memory
  * will not be freed until last reference is dropped.
  */
 void input_free_device(struct input_dev *dev)
 {
 	if (dev)
 		input_put_device(dev);
 }
 EXPORT_SYMBOL(input_free_device);
 /**
  * input_set_capability - mark device as capable of a certain event
  * @dev: device that is capable of emitting or accepting event
  * @type: type of the event (EV_KEY, EV_REL, etc...)
  * @code: event code
  *
  * In addition to setting up corresponding bit in appropriate capability
  * bitmap the function also adjusts dev->evbit.
  */
 void input_set_capability(struct input_dev *dev, unsigned int type, unsigned int code)
 {
 	switch (type) {
 	case EV_KEY:
 		__set_bit(code, dev->keybit);
 		break;
 	case EV_REL:
 		__set_bit(code, dev->relbit);
 		break;
 	case EV_ABS:
 		__set_bit(code, dev->absbit);
 		break;
 	case EV_MSC:
 		__set_bit(code, dev->mscbit);
 		break;
 	case EV_SW:
 		__set_bit(code, dev->swbit);
 		break;
 	case EV_LED:
 		__set_bit(code, dev->ledbit);
 		break;
 	case EV_SND:
 		__set_bit(code, dev->sndbit);
 		break;
 	case EV_FF:
 		__set_bit(code, dev->ffbit);
 		break;
 	case EV_PWR:
 		/* do nothing */
 		break;
 	default:
 		printk(KERN_ERR
 			"input_set_capability: unknown type %u (code %u)\n",
 			type, code);
 		dump_stack();
 		return;
 	}
 	__set_bit(type, dev->evbit);
 }
 EXPORT_SYMBOL(input_set_capability);
 /**
  * input_register_device - register device with input core
  * @dev: device to be registered
  *
  * This function registers device with input core. The device must be
  * allocated with input_allocate_device() and all it's capabilities
  * set up before registering.
  * If function fails the device must be freed with input_free_device().
  * Once device has been successfully registered it can be unregistered
  * with input_unregister_device(); input_free_device() should not be
  * called in this case.
  */
 int input_register_device(struct input_dev *dev)
 {
 	static atomic_t input_no = ATOMIC_INIT(0);
 	struct input_handler *handler;
 	const char *path;
 	int error;
 	__set_bit(EV_SYN, dev->evbit);
 	/*
 	 * If delay and period are pre-set by the driver, then autorepeating
 	 * is handled by the driver itself and we don't do it in input.c.
 	 */
 	init_timer(&dev->timer);
 	if (!dev->rep[REP_DELAY] && !dev->rep[REP_PERIOD]) {
 		dev->timer.data = (long) dev;
 		dev->timer.function = input_repeat_key;
 		dev->rep[REP_DELAY] = 250;
 		dev->rep[REP_PERIOD] = 33;
 	}
 	if (!dev->getkeycode)
 		dev->getkeycode = input_default_getkeycode;
 	if (!dev->setkeycode)
 		dev->setkeycode = input_default_setkeycode;
 	dev_set_name(&dev->dev, "input%ld",
 		     (unsigned long) atomic_inc_return(&input_no) - 1);
 	error = device_add(&dev->dev);
 	if (error)
 		return error;
 	path = kobject_get_path(&dev->dev.kobj, GFP_KERNEL);
 	printk(KERN_INFO "input: %s as %s\n",
 		dev->name ? dev->name : "Unspecified device", path ? path : "N/A");
 	kfree(path);
 	error = mutex_lock_interruptible(&input_mutex);
 	if (error) {
 		device_del(&dev->dev);
 		return error;
 	}
 	list_add_tail(&dev->node, &input_dev_list);
 	list_for_each_entry(handler, &input_handler_list, node)
 		input_attach_handler(dev, handler);
 	input_wakeup_procfs_readers();
 	mutex_unlock(&input_mutex);
 	return 0;
 }
 EXPORT_SYMBOL(input_register_device);
 /**
  * input_unregister_device - unregister previously registered device
  * @dev: device to be unregistered
  *
  * This function unregisters an input device. Once device is unregistered
  * the caller should not try to access it as it may get freed at any moment.
  */
 void input_unregister_device(struct input_dev *dev)
 {
 	struct input_handle *handle, *next;
 	input_disconnect_device(dev);
 	mutex_lock(&input_mutex);
 	list_for_each_entry_safe(handle, next, &dev->h_list, d_node)
 		handle->handler->disconnect(handle);
 	WARN_ON(!list_empty(&dev->h_list));
 	del_timer_sync(&dev->timer);
 	list_del_init(&dev->node);
 	input_wakeup_procfs_readers();
 	mutex_unlock(&input_mutex);
 	device_unregister(&dev->dev);
 }
 EXPORT_SYMBOL(input_unregister_device);
 /**
  * input_register_handler - register a new input handler
  * @handler: handler to be registered
  *
  * This function registers a new input handler (interface) for input
  * devices in the system and attaches it to all input devices that
  * are compatible with the handler.
  */
 int input_register_handler(struct input_handler *handler)
 {
 	struct input_dev *dev;
 	int retval;
 	retval = mutex_lock_interruptible(&input_mutex);
 	if (retval)
 		return retval;
 	INIT_LIST_HEAD(&handler->h_list);
 	if (handler->fops != NULL) {
 		if (input_table[handler->minor >> 5]) {
 			retval = -EBUSY;
 			goto out;
 		}
 		input_table[handler->minor >> 5] = handler;
 	}
 	list_add_tail(&handler->node, &input_handler_list);
 	list_for_each_entry(dev, &input_dev_list, node)
 		input_attach_handler(dev, handler);
 	input_wakeup_procfs_readers();
  out:
 	mutex_unlock(&input_mutex);
 	return retval;
 }
 EXPORT_SYMBOL(input_register_handler);
 /**
  * input_unregister_handler - unregisters an input handler
  * @handler: handler to be unregistered
  *
  * This function disconnects a handler from its input devices and
  * removes it from lists of known handlers.
  */
 void input_unregister_handler(struct input_handler *handler)
 {
 	struct input_handle *handle, *next;
 	mutex_lock(&input_mutex);
 	list_for_each_entry_safe(handle, next, &handler->h_list, h_node)
 		handler->disconnect(handle);
 	WARN_ON(!list_empty(&handler->h_list));
 	list_del_init(&handler->node);
 	if (handler->fops != NULL)
 		input_table[handler->minor >> 5] = NULL;
 	input_wakeup_procfs_readers();
 	mutex_unlock(&input_mutex);
 }
 EXPORT_SYMBOL(input_unregister_handler);
 /**
  * input_handler_for_each_handle - handle iterator
  * @handler: input handler to iterate
  * @data: data for the callback
  * @fn: function to be called for each handle
  *
  * Iterate over @bus's list of devices, and call @fn for each, passing
  * it @data and stop when @fn returns a non-zero value. The function is
  * using RCU to traverse the list and therefore may be usind in atonic
  * contexts. The @fn callback is invoked from RCU critical section and
  * thus must not sleep.
  */
 int input_handler_for_each_handle(struct input_handler *handler, void *data,
 				  int (*fn)(struct input_handle *, void *))
 {
 	struct input_handle *handle;
 	int retval = 0;
 	rcu_read_lock();
 	list_for_each_entry_rcu(handle, &handler->h_list, h_node) {
 		retval = fn(handle, data);
 		if (retval)
 			break;
 	}
 	rcu_read_unlock();
 	return retval;
 }
 EXPORT_SYMBOL(input_handler_for_each_handle);
 /**
  * input_register_handle - register a new input handle
  * @handle: handle to register
  *
  * This function puts a new input handle onto device's
  * and handler's lists so that events can flow through
  * it once it is opened using input_open_device().
  *
  * This function is supposed to be called from handler's
  * connect() method.
  */
 int input_register_handle(struct input_handle *handle)
 {
 	struct input_handler *handler = handle->handler;
 	struct input_dev *dev = handle->dev;
 	int error;
 	/*
 	 * We take dev->mutex here to prevent race with
 	 * input_release_device().
 	 */
 	error = mutex_lock_interruptible(&dev->mutex);
 	if (error)
 		return error;
 	list_add_tail_rcu(&handle->d_node, &dev->h_list);
 	mutex_unlock(&dev->mutex);
 	/*
 	 * Since we are supposed to be called from ->connect()
 	 * which is mutually exclusive with ->disconnect()
 	 * we can't be racing with input_unregister_handle()
 	 * and so separate lock is not needed here.
 	 */
 	list_add_tail_rcu(&handle->h_node, &handler->h_list);
 	if (handler->start)
 		handler->start(handle);
 	return 0;
 }
 EXPORT_SYMBOL(input_register_handle);
 /**
  * input_unregister_handle - unregister an input handle
  * @handle: handle to unregister
  *
  * This function removes input handle from device's
  * and handler's lists.
  *
  * This function is supposed to be called from handler's
  * disconnect() method.
  */
 void input_unregister_handle(struct input_handle *handle)
 {
 	struct input_dev *dev = handle->dev;
 	list_del_rcu(&handle->h_node);
 	/*
 	 * Take dev->mutex to prevent race with input_release_device().
 	 */
 	mutex_lock(&dev->mutex);
 	list_del_rcu(&handle->d_node);
 	mutex_unlock(&dev->mutex);
 	synchronize_rcu();
 }
 EXPORT_SYMBOL(input_unregister_handle);
 static int input_open_file(struct inode *inode, struct file *file)
 {
 	struct input_handler *handler;
 	const struct file_operations *old_fops, *new_fops = NULL;
 	int err;
 	lock_kernel();
 	/* No load-on-demand here? */
 	handler = input_table[iminor(inode) >> 5];
 	if (!handler || !(new_fops = fops_get(handler->fops))) {
 		err = -ENODEV;
 		goto out;
 	}
 	/*
 	 * That's _really_ odd. Usually NULL ->open means "nothing special",
 	 * not "no device". Oh, well...
 	 */
 	if (!new_fops->open) {
 		fops_put(new_fops);
 		err = -ENODEV;
 		goto out;
 	}
 	old_fops = file->f_op;
 	file->f_op = new_fops;
 	err = new_fops->open(inode, file);
 	if (err) {
 		fops_put(file->f_op);
 		file->f_op = fops_get(old_fops);
 	}
 	fops_put(old_fops);
 out:
 	unlock_kernel();
 	return err;
 }
 static const struct file_operations input_fops = {
 	.owner = THIS_MODULE,
 	.open = input_open_file,
 };
 static void __init input_init_abs_bypass(void)
 {
 	const unsigned int *p;
 	for (p = input_abs_bypass_init_data; *p; p++)
 		input_abs_bypass[BIT_WORD(*p)] |= BIT_MASK(*p);
 }
 static int __init input_init(void)
 {
 	int err;
 	input_init_abs_bypass();
 	err = class_register(&input_class);
 	if (err) {
 		printk(KERN_ERR "input: unable to register input_dev class\n");
 		return err;
 	}
 	err = input_proc_init();
 	if (err)
 		goto fail1;
 	err = register_chrdev(INPUT_MAJOR, "input", &input_fops);
 	if (err) {
 		printk(KERN_ERR "input: unable to register char major %d", INPUT_MAJOR);
 		goto fail2;
 	}
 	return 0;
  fail2:	input_proc_exit();
  fail1:	class_unregister(&input_class);
 	return err;
 }
 static void __exit input_exit(void)
 {
 	input_proc_exit();
 	unregister_chrdev(INPUT_MAJOR, "input");
 	class_unregister(&input_class);
 }
 subsys_initcall(input_init);
 module_exit(input_exit);

include/linux/input.h

Diff comments View file @ cb6ecf6

 #ifndef _INPUT_H
 #define _INPUT_H
 /*
  * Copyright (c) 1999-2002 Vojtech Pavlik
  *
  * This program is free software; you can redistribute it and/or modify it
  * under the terms of the GNU General Public License version 2 as published by
  * the Free Software Foundation.
  */
 #ifdef __KERNEL__
 #include <linux/time.h>
 #include <linux/list.h>
 #else
 #include <sys/time.h>
 #include <sys/ioctl.h>
 #include <sys/types.h>
 #include <linux/types.h>
 #endif
 /*
  * The event structure itself
  */
 struct input_event {
 	struct timeval time;
 	__u16 type;
 	__u16 code;
 	__s32 value;
 };
 /*
  * Protocol version.
  */
 #define EV_VERSION		0x010000
 /*
  * IOCTLs (0x00 - 0x7f)
  */
 struct input_id {
 	__u16 bustype;
 	__u16 vendor;
 	__u16 product;
 	__u16 version;
 };
 struct input_absinfo {
 	__s32 value;
 	__s32 minimum;
 	__s32 maximum;
 	__s32 fuzz;
 	__s32 flat;
 	__s32 resolution;
 };
 #define EVIOCGVERSION		_IOR('E', 0x01, int)			/* get driver version */
 #define EVIOCGID		_IOR('E', 0x02, struct input_id)	/* get device ID */
 #define EVIOCGREP		_IOR('E', 0x03, int[2])			/* get repeat settings */
 #define EVIOCSREP		_IOW('E', 0x03, int[2])			/* set repeat settings */
 #define EVIOCGKEYCODE		_IOR('E', 0x04, int[2])			/* get keycode */
 #define EVIOCSKEYCODE		_IOW('E', 0x04, int[2])			/* set keycode */
 #define EVIOCGNAME(len)		_IOC(_IOC_READ, 'E', 0x06, len)		/* get device name */
 #define EVIOCGPHYS(len)		_IOC(_IOC_READ, 'E', 0x07, len)		/* get physical location */
 #define EVIOCGUNIQ(len)		_IOC(_IOC_READ, 'E', 0x08, len)		/* get unique identifier */
 #define EVIOCGKEY(len)		_IOC(_IOC_READ, 'E', 0x18, len)		/* get global keystate */
 #define EVIOCGLED(len)		_IOC(_IOC_READ, 'E', 0x19, len)		/* get all LEDs */
 #define EVIOCGSND(len)		_IOC(_IOC_READ, 'E', 0x1a, len)		/* get all sounds status */
 #define EVIOCGSW(len)		_IOC(_IOC_READ, 'E', 0x1b, len)		/* get all switch states */
 #define EVIOCGBIT(ev,len)	_IOC(_IOC_READ, 'E', 0x20 + ev, len)	/* get event bits */
 #define EVIOCGABS(abs)		_IOR('E', 0x40 + abs, struct input_absinfo)		/* get abs value/limits */
 #define EVIOCSABS(abs)		_IOW('E', 0xc0 + abs, struct input_absinfo)		/* set abs value/limits */
 #define EVIOCSFF		_IOC(_IOC_WRITE, 'E', 0x80, sizeof(struct ff_effect))	/* send a force effect to a force feedback device */
 #define EVIOCRMFF		_IOW('E', 0x81, int)			/* Erase a force effect */
 #define EVIOCGEFFECTS		_IOR('E', 0x84, int)			/* Report number of effects playable at the same time */
 #define EVIOCGRAB		_IOW('E', 0x90, int)			/* Grab/Release device */
 /*
  * Event types
  */
 #define EV_SYN			0x00
 #define EV_KEY			0x01
 #define EV_REL			0x02
 #define EV_ABS			0x03
 #define EV_MSC			0x04
 #define EV_SW			0x05
 #define EV_LED			0x11
 #define EV_SND			0x12
 #define EV_REP			0x14
 #define EV_FF			0x15
 #define EV_PWR			0x16
 #define EV_FF_STATUS		0x17
 #define EV_MAX			0x1f
 #define EV_CNT			(EV_MAX+1)
 /*
  * Synchronization events.
  */
 #define SYN_REPORT		0
 #define SYN_CONFIG		1
 #define SYN_MT_REPORT		2
 /*
  * Keys and buttons
  *
  * Most of the keys/buttons are modeled after USB HUT 1.12
  * (see http://www.usb.org/developers/hidpage).
  * Abbreviations in the comments:
  * AC - Application Control
  * AL - Application Launch Button
  * SC - System Control
  */
 #define KEY_RESERVED		0
 #define KEY_ESC			1
 #define KEY_1			2
 #define KEY_2			3
 #define KEY_3			4
 #define KEY_4			5
 #define KEY_5			6
 #define KEY_6			7
 #define KEY_7			8
 #define KEY_8			9
 #define KEY_9			10
 #define KEY_0			11
 #define KEY_MINUS		12
 #define KEY_EQUAL		13
 #define KEY_BACKSPACE		14
 #define KEY_TAB			15
 #define KEY_Q			16
 #define KEY_W			17
 #define KEY_E			18
 #define KEY_R			19
 #define KEY_T			20
 #define KEY_Y			21
 #define KEY_U			22
 #define KEY_I			23
 #define KEY_O			24
 #define KEY_P			25
 #define KEY_LEFTBRACE		26
 #define KEY_RIGHTBRACE		27
 #define KEY_ENTER		28
 #define KEY_LEFTCTRL		29
 #define KEY_A			30
 #define KEY_S			31
 #define KEY_D			32
 #define KEY_F			33
 #define KEY_G			34
 #define KEY_H			35
 #define KEY_J			36
 #define KEY_K			37
 #define KEY_L			38
 #define KEY_SEMICOLON		39
 #define KEY_APOSTROPHE		40
 #define KEY_GRAVE		41
 #define KEY_LEFTSHIFT		42
 #define KEY_BACKSLASH		43
 #define KEY_Z			44
 #define KEY_X			45
 #define KEY_C			46
 #define KEY_V			47
 #define KEY_B			48
 #define KEY_N			49
 #define KEY_M			50
 #define KEY_COMMA		51
 #define KEY_DOT			52
 #define KEY_SLASH		53
 #define KEY_RIGHTSHIFT		54
 #define KEY_KPASTERISK		55
 #define KEY_LEFTALT		56
 #define KEY_SPACE		57
 #define KEY_CAPSLOCK		58
 #define KEY_F1			59
 #define KEY_F2			60
 #define KEY_F3			61
 #define KEY_F4			62
 #define KEY_F5			63
 #define KEY_F6			64
 #define KEY_F7			65
 #define KEY_F8			66
 #define KEY_F9			67
 #define KEY_F10			68
 #define KEY_NUMLOCK		69
 #define KEY_SCROLLLOCK		70
 #define KEY_KP7			71
 #define KEY_KP8			72
 #define KEY_KP9			73
 #define KEY_KPMINUS		74
 #define KEY_KP4			75
 #define KEY_KP5			76
 #define KEY_KP6			77
 #define KEY_KPPLUS		78
 #define KEY_KP1			79
 #define KEY_KP2			80
 #define KEY_KP3			81
 #define KEY_KP0			82
 #define KEY_KPDOT		83
 #define KEY_ZENKAKUHANKAKU	85
 #define KEY_102ND		86
 #define KEY_F11			87
 #define KEY_F12			88
 #define KEY_RO			89
 #define KEY_KATAKANA		90
 #define KEY_HIRAGANA		91
 #define KEY_HENKAN		92
 #define KEY_KATAKANAHIRAGANA	93
 #define KEY_MUHENKAN		94
 #define KEY_KPJPCOMMA		95
 #define KEY_KPENTER		96
 #define KEY_RIGHTCTRL		97
 #define KEY_KPSLASH		98
 #define KEY_SYSRQ		99
 #define KEY_RIGHTALT		100
 #define KEY_LINEFEED		101
 #define KEY_HOME		102
 #define KEY_UP			103
 #define KEY_PAGEUP		104
 #define KEY_LEFT		105
 #define KEY_RIGHT		106
 #define KEY_END			107
 #define KEY_DOWN		108
 #define KEY_PAGEDOWN		109
 #define KEY_INSERT		110
 #define KEY_DELETE		111
 #define KEY_MACRO		112
 #define KEY_MUTE		113
 #define KEY_VOLUMEDOWN		114
 #define KEY_VOLUMEUP		115
 #define KEY_POWER		116	/* SC System Power Down */
 #define KEY_KPEQUAL		117
 #define KEY_KPPLUSMINUS		118
 #define KEY_PAUSE		119
 #define KEY_SCALE		120	/* AL Compiz Scale (Expose) */
 #define KEY_KPCOMMA		121
 #define KEY_HANGEUL		122
 #define KEY_HANGUEL		KEY_HANGEUL
 #define KEY_HANJA		123
 #define KEY_YEN			124
 #define KEY_LEFTMETA		125
 #define KEY_RIGHTMETA		126
 #define KEY_COMPOSE		127
 #define KEY_STOP		128	/* AC Stop */
 #define KEY_AGAIN		129
 #define KEY_PROPS		130	/* AC Properties */
 #define KEY_UNDO		131	/* AC Undo */
 #define KEY_FRONT		132
 #define KEY_COPY		133	/* AC Copy */
 #define KEY_OPEN		134	/* AC Open */
 #define KEY_PASTE		135	/* AC Paste */
 #define KEY_FIND		136	/* AC Search */
 #define KEY_CUT			137	/* AC Cut */
 #define KEY_HELP		138	/* AL Integrated Help Center */
 #define KEY_MENU		139	/* Menu (show menu) */
 #define KEY_CALC		140	/* AL Calculator */
 #define KEY_SETUP		141
 #define KEY_SLEEP		142	/* SC System Sleep */
 #define KEY_WAKEUP		143	/* System Wake Up */
 #define KEY_FILE		144	/* AL Local Machine Browser */
 #define KEY_SENDFILE		145
 #define KEY_DELETEFILE		146
 #define KEY_XFER		147
 #define KEY_PROG1		148
 #define KEY_PROG2		149
 #define KEY_WWW			150	/* AL Internet Browser */
 #define KEY_MSDOS		151
 #define KEY_COFFEE		152	/* AL Terminal Lock/Screensaver */
 #define KEY_SCREENLOCK		KEY_COFFEE
 #define KEY_DIRECTION		153
 #define KEY_CYCLEWINDOWS	154
 #define KEY_MAIL		155
 #define KEY_BOOKMARKS		156	/* AC Bookmarks */
 #define KEY_COMPUTER		157
 #define KEY_BACK		158	/* AC Back */
 #define KEY_FORWARD		159	/* AC Forward */
 #define KEY_CLOSECD		160
 #define KEY_EJECTCD		161
 #define KEY_EJECTCLOSECD	162
 #define KEY_NEXTSONG		163
 #define KEY_PLAYPAUSE		164
 #define KEY_PREVIOUSSONG	165
 #define KEY_STOPCD		166
 #define KEY_RECORD		167
 #define KEY_REWIND		168
 #define KEY_PHONE		169	/* Media Select Telephone */
 #define KEY_ISO			170
 #define KEY_CONFIG		171	/* AL Consumer Control Configuration */
 #define KEY_HOMEPAGE		172	/* AC Home */
 #define KEY_REFRESH		173	/* AC Refresh */
 #define KEY_EXIT		174	/* AC Exit */
 #define KEY_MOVE		175
 #define KEY_EDIT		176
 #define KEY_SCROLLUP		177
 #define KEY_SCROLLDOWN		178
 #define KEY_KPLEFTPAREN		179
 #define KEY_KPRIGHTPAREN	180
 #define KEY_NEW			181	/* AC New */
 #define KEY_REDO		182	/* AC Redo/Repeat */
 #define KEY_F13			183
 #define KEY_F14			184
 #define KEY_F15			185
 #define KEY_F16			186
 #define KEY_F17			187
 #define KEY_F18			188
 #define KEY_F19			189
 #define KEY_F20			190
 #define KEY_F21			191
 #define KEY_F22			192
 #define KEY_F23			193
 #define KEY_F24			194
 #define KEY_PLAYCD		200
 #define KEY_PAUSECD		201
 #define KEY_PROG3		202
 #define KEY_PROG4		203
 #define KEY_DASHBOARD		204	/* AL Dashboard */
 #define KEY_SUSPEND		205
 #define KEY_CLOSE		206	/* AC Close */
 #define KEY_PLAY		207
 #define KEY_FASTFORWARD		208
 #define KEY_BASSBOOST		209
 #define KEY_PRINT		210	/* AC Print */
 #define KEY_HP			211
 #define KEY_CAMERA		212
 #define KEY_SOUND		213
 #define KEY_QUESTION		214
 #define KEY_EMAIL		215
 #define KEY_CHAT		216
 #define KEY_SEARCH		217
 #define KEY_CONNECT		218
 #define KEY_FINANCE		219	/* AL Checkbook/Finance */
 #define KEY_SPORT		220
 #define KEY_SHOP		221
 #define KEY_ALTERASE		222
 #define KEY_CANCEL		223	/* AC Cancel */
 #define KEY_BRIGHTNESSDOWN	224
 #define KEY_BRIGHTNESSUP	225
 #define KEY_MEDIA		226
 #define KEY_SWITCHVIDEOMODE	227	/* Cycle between available video
 					   outputs (Monitor/LCD/TV-out/etc) */
 #define KEY_KBDILLUMTOGGLE	228
 #define KEY_KBDILLUMDOWN	229
 #define KEY_KBDILLUMUP		230
 #define KEY_SEND		231	/* AC Send */
 #define KEY_REPLY		232	/* AC Reply */
 #define KEY_FORWARDMAIL		233	/* AC Forward Msg */
 #define KEY_SAVE		234	/* AC Save */
 #define KEY_DOCUMENTS		235
 #define KEY_BATTERY		236
 #define KEY_BLUETOOTH		237
 #define KEY_WLAN		238
 #define KEY_UWB			239
 #define KEY_UNKNOWN		240
 #define KEY_VIDEO_NEXT		241	/* drive next video source */
 #define KEY_VIDEO_PREV		242	/* drive previous video source */
 #define KEY_BRIGHTNESS_CYCLE	243	/* brightness up, after max is min */
 #define KEY_BRIGHTNESS_ZERO	244	/* brightness off, use ambient */
 #define KEY_DISPLAY_OFF		245	/* display device to off state */
 #define KEY_WIMAX		246
 /* Range 248 - 255 is reserved for special needs of AT keyboard driver */
 #define BTN_MISC		0x100
 #define BTN_0			0x100
 #define BTN_1			0x101
 #define BTN_2			0x102
 #define BTN_3			0x103
 #define BTN_4			0x104
 #define BTN_5			0x105
 #define BTN_6			0x106
 #define BTN_7			0x107
 #define BTN_8			0x108
 #define BTN_9			0x109
 #define BTN_MOUSE		0x110
 #define BTN_LEFT		0x110
 #define BTN_RIGHT		0x111
 #define BTN_MIDDLE		0x112
 #define BTN_SIDE		0x113
 #define BTN_EXTRA		0x114
 #define BTN_FORWARD		0x115
 #define BTN_BACK		0x116
 #define BTN_TASK		0x117
 #define BTN_JOYSTICK		0x120
 #define BTN_TRIGGER		0x120
 #define BTN_THUMB		0x121
 #define BTN_THUMB2		0x122
 #define BTN_TOP			0x123
 #define BTN_TOP2		0x124
 #define BTN_PINKIE		0x125
 #define BTN_BASE		0x126
 #define BTN_BASE2		0x127
 #define BTN_BASE3		0x128
 #define BTN_BASE4		0x129
 #define BTN_BASE5		0x12a
 #define BTN_BASE6		0x12b
 #define BTN_DEAD		0x12f
 #define BTN_GAMEPAD		0x130
 #define BTN_A			0x130
 #define BTN_B			0x131
 #define BTN_C			0x132
 #define BTN_X			0x133
 #define BTN_Y			0x134
 #define BTN_Z			0x135
 #define BTN_TL			0x136
 #define BTN_TR			0x137
 #define BTN_TL2			0x138
 #define BTN_TR2			0x139
 #define BTN_SELECT		0x13a
 #define BTN_START		0x13b
 #define BTN_MODE		0x13c
 #define BTN_THUMBL		0x13d
 #define BTN_THUMBR		0x13e
 #define BTN_DIGI		0x140
 #define BTN_TOOL_PEN		0x140
 #define BTN_TOOL_RUBBER		0x141
 #define BTN_TOOL_BRUSH		0x142
 #define BTN_TOOL_PENCIL		0x143
 #define BTN_TOOL_AIRBRUSH	0x144
 #define BTN_TOOL_FINGER		0x145
 #define BTN_TOOL_MOUSE		0x146
 #define BTN_TOOL_LENS		0x147
 #define BTN_TOUCH		0x14a
 #define BTN_STYLUS		0x14b
 #define BTN_STYLUS2		0x14c
 #define BTN_TOOL_DOUBLETAP	0x14d
 #define BTN_TOOL_TRIPLETAP	0x14e
 #define BTN_TOOL_QUADTAP	0x14f	/* Four fingers on trackpad */
 #define BTN_WHEEL		0x150
 #define BTN_GEAR_DOWN		0x150
 #define BTN_GEAR_UP		0x151
 #define KEY_OK			0x160
 #define KEY_SELECT		0x161
 #define KEY_GOTO		0x162
 #define KEY_CLEAR		0x163
 #define KEY_POWER2		0x164
 #define KEY_OPTION		0x165
 #define KEY_INFO		0x166	/* AL OEM Features/Tips/Tutorial */
 #define KEY_TIME		0x167
 #define KEY_VENDOR		0x168
 #define KEY_ARCHIVE		0x169
 #define KEY_PROGRAM		0x16a	/* Media Select Program Guide */
 #define KEY_CHANNEL		0x16b
 #define KEY_FAVORITES		0x16c
 #define KEY_EPG			0x16d
 #define KEY_PVR			0x16e	/* Media Select Home */
 #define KEY_MHP			0x16f
 #define KEY_LANGUAGE		0x170
 #define KEY_TITLE		0x171
 #define KEY_SUBTITLE		0x172
 #define KEY_ANGLE		0x173
 #define KEY_ZOOM		0x174
 #define KEY_MODE		0x175
 #define KEY_KEYBOARD		0x176
 #define KEY_SCREEN		0x177
 #define KEY_PC			0x178	/* Media Select Computer */
 #define KEY_TV			0x179	/* Media Select TV */
 #define KEY_TV2			0x17a	/* Media Select Cable */
 #define KEY_VCR			0x17b	/* Media Select VCR */
 #define KEY_VCR2		0x17c	/* VCR Plus */
 #define KEY_SAT			0x17d	/* Media Select Satellite */
 #define KEY_SAT2		0x17e
 #define KEY_CD			0x17f	/* Media Select CD */
 #define KEY_TAPE		0x180	/* Media Select Tape */
 #define KEY_RADIO		0x181
 #define KEY_TUNER		0x182	/* Media Select Tuner */
 #define KEY_PLAYER		0x183
 #define KEY_TEXT		0x184
 #define KEY_DVD			0x185	/* Media Select DVD */
 #define KEY_AUX			0x186
 #define KEY_MP3			0x187
 #define KEY_AUDIO		0x188
 #define KEY_VIDEO		0x189
 #define KEY_DIRECTORY		0x18a
 #define KEY_LIST		0x18b
 #define KEY_MEMO		0x18c	/* Media Select Messages */
 #define KEY_CALENDAR		0x18d
 #define KEY_RED			0x18e
 #define KEY_GREEN		0x18f
 #define KEY_YELLOW		0x190
 #define KEY_BLUE		0x191
 #define KEY_CHANNELUP		0x192	/* Channel Increment */
 #define KEY_CHANNELDOWN		0x193	/* Channel Decrement */
 #define KEY_FIRST		0x194
 #define KEY_LAST		0x195	/* Recall Last */
 #define KEY_AB			0x196
 #define KEY_NEXT		0x197
 #define KEY_RESTART		0x198
 #define KEY_SLOW		0x199
 #define KEY_SHUFFLE		0x19a
 #define KEY_BREAK		0x19b
 #define KEY_PREVIOUS		0x19c
 #define KEY_DIGITS		0x19d
 #define KEY_TEEN		0x19e
 #define KEY_TWEN		0x19f
 #define KEY_VIDEOPHONE		0x1a0	/* Media Select Video Phone */
 #define KEY_GAMES		0x1a1	/* Media Select Games */
 #define KEY_ZOOMIN		0x1a2	/* AC Zoom In */
 #define KEY_ZOOMOUT		0x1a3	/* AC Zoom Out */
 #define KEY_ZOOMRESET		0x1a4	/* AC Zoom */
 #define KEY_WORDPROCESSOR	0x1a5	/* AL Word Processor */
 #define KEY_EDITOR		0x1a6	/* AL Text Editor */
 #define KEY_SPREADSHEET		0x1a7	/* AL Spreadsheet */
 #define KEY_GRAPHICSEDITOR	0x1a8	/* AL Graphics Editor */
 #define KEY_PRESENTATION	0x1a9	/* AL Presentation App */
 #define KEY_DATABASE		0x1aa	/* AL Database App */
 #define KEY_NEWS		0x1ab	/* AL Newsreader */
 #define KEY_VOICEMAIL		0x1ac	/* AL Voicemail */
 #define KEY_ADDRESSBOOK		0x1ad	/* AL Contacts/Address Book */
 #define KEY_MESSENGER		0x1ae	/* AL Instant Messaging */
 #define KEY_DISPLAYTOGGLE	0x1af	/* Turn display (LCD) on and off */
 #define KEY_SPELLCHECK		0x1b0   /* AL Spell Check */
 #define KEY_LOGOFF		0x1b1   /* AL Logoff */
 #define KEY_DOLLAR		0x1b2
 #define KEY_EURO		0x1b3
 #define KEY_FRAMEBACK		0x1b4	/* Consumer - transport controls */
 #define KEY_FRAMEFORWARD	0x1b5
 #define KEY_CONTEXT_MENU	0x1b6	/* GenDesc - system context menu */
 #define KEY_MEDIA_REPEAT	0x1b7	/* Consumer - transport control */
 #define KEY_DEL_EOL		0x1c0
 #define KEY_DEL_EOS		0x1c1
 #define KEY_INS_LINE		0x1c2
 #define KEY_DEL_LINE		0x1c3
 #define KEY_FN			0x1d0
 #define KEY_FN_ESC		0x1d1
 #define KEY_FN_F1		0x1d2
 #define KEY_FN_F2		0x1d3
 #define KEY_FN_F3		0x1d4
 #define KEY_FN_F4		0x1d5
 #define KEY_FN_F5		0x1d6
 #define KEY_FN_F6		0x1d7
 #define KEY_FN_F7		0x1d8
 #define KEY_FN_F8		0x1d9
 #define KEY_FN_F9		0x1da
 #define KEY_FN_F10		0x1db
 #define KEY_FN_F11		0x1dc
 #define KEY_FN_F12		0x1dd
 #define KEY_FN_1		0x1de
 #define KEY_FN_2		0x1df
 #define KEY_FN_D		0x1e0
 #define KEY_FN_E		0x1e1
 #define KEY_FN_F		0x1e2
 #define KEY_FN_S		0x1e3
 #define KEY_FN_B		0x1e4
 #define KEY_BRL_DOT1		0x1f1
 #define KEY_BRL_DOT2		0x1f2
 #define KEY_BRL_DOT3		0x1f3
 #define KEY_BRL_DOT4		0x1f4
 #define KEY_BRL_DOT5		0x1f5
 #define KEY_BRL_DOT6		0x1f6
 #define KEY_BRL_DOT7		0x1f7
 #define KEY_BRL_DOT8		0x1f8
 #define KEY_BRL_DOT9		0x1f9
 #define KEY_BRL_DOT10		0x1fa
 #define KEY_NUMERIC_0		0x200	/* used by phones, remote controls, */
 #define KEY_NUMERIC_1		0x201	/* and other keypads */
 #define KEY_NUMERIC_2		0x202
 #define KEY_NUMERIC_3		0x203
 #define KEY_NUMERIC_4		0x204
 #define KEY_NUMERIC_5		0x205
 #define KEY_NUMERIC_6		0x206
 #define KEY_NUMERIC_7		0x207
 #define KEY_NUMERIC_8		0x208
 #define KEY_NUMERIC_9		0x209
 #define KEY_NUMERIC_STAR	0x20a
 #define KEY_NUMERIC_POUND	0x20b
 #define KEY_CAMERA_FOCUS	0x210
 /* We avoid low common keys in module aliases so they don't get huge. */
 #define KEY_MIN_INTERESTING	KEY_MUTE
 #define KEY_MAX			0x2ff
 #define KEY_CNT			(KEY_MAX+1)
 /*
  * Relative axes
  */
 #define REL_X			0x00
 #define REL_Y			0x01
 #define REL_Z			0x02
 #define REL_RX			0x03
 #define REL_RY			0x04
 #define REL_RZ			0x05
 #define REL_HWHEEL		0x06
 #define REL_DIAL		0x07
 #define REL_WHEEL		0x08
 #define REL_MISC		0x09
 #define REL_MAX			0x0f
 #define REL_CNT			(REL_MAX+1)
 /*
  * Absolute axes
  */
 #define ABS_X			0x00
 #define ABS_Y			0x01
 #define ABS_Z			0x02
 #define ABS_RX			0x03
 #define ABS_RY			0x04
 #define ABS_RZ			0x05
 #define ABS_THROTTLE		0x06
 #define ABS_RUDDER		0x07
 #define ABS_WHEEL		0x08
 #define ABS_GAS			0x09
 #define ABS_BRAKE		0x0a
 #define ABS_HAT0X		0x10
 #define ABS_HAT0Y		0x11
 #define ABS_HAT1X		0x12
 #define ABS_HAT1Y		0x13
 #define ABS_HAT2X		0x14
 #define ABS_HAT2Y		0x15
 #define ABS_HAT3X		0x16
 #define ABS_HAT3Y		0x17
 #define ABS_PRESSURE		0x18
 #define ABS_DISTANCE		0x19
 #define ABS_TILT_X		0x1a
 #define ABS_TILT_Y		0x1b
 #define ABS_TOOL_WIDTH		0x1c
 #define ABS_VOLUME		0x20
 #define ABS_MISC		0x28
 #define ABS_MT_TOUCH_MAJOR	0x30	/* Major axis of touching ellipse */
 #define ABS_MT_TOUCH_MINOR	0x31	/* Minor axis (omit if circular) */
 #define ABS_MT_WIDTH_MAJOR	0x32	/* Major axis of approaching ellipse */
 #define ABS_MT_WIDTH_MINOR	0x33	/* Minor axis (omit if circular) */
 #define ABS_MT_ORIENTATION	0x34	/* Ellipse orientation */
 #define ABS_MT_POSITION_X	0x35	/* Center X ellipse position */
 #define ABS_MT_POSITION_Y	0x36	/* Center Y ellipse position */
 #define ABS_MT_TOOL_TYPE	0x37	/* Type of touching device */
 #define ABS_MT_BLOB_ID		0x38	/* Group a set of packets as a blob */
 #define ABS_MT_TRACKING_ID	0x39	/* Unique ID of initiated contact */
+#define ABS_MT_PRESSURE		0x3a	/* Pressure on contact area */
 #define ABS_MAX			0x3f
 #define ABS_CNT			(ABS_MAX+1)
 /*
  * Switch events
  */
 #define SW_LID			0x00  /* set = lid shut */
 #define SW_TABLET_MODE		0x01  /* set = tablet mode */
 #define SW_HEADPHONE_INSERT	0x02  /* set = inserted */
 #define SW_RFKILL_ALL		0x03  /* rfkill master switch, type "any"
 					 set = radio enabled */
 #define SW_RADIO		SW_RFKILL_ALL	/* deprecated */
 #define SW_MICROPHONE_INSERT	0x04  /* set = inserted */
 #define SW_DOCK			0x05  /* set = plugged into dock */
 #define SW_LINEOUT_INSERT	0x06  /* set = inserted */
 #define SW_JACK_PHYSICAL_INSERT 0x07  /* set = mechanical switch set */
 #define SW_VIDEOOUT_INSERT	0x08  /* set = inserted */
 #define SW_CAMERA_LENS_COVER	0x09  /* set = lens covered */
 #define SW_KEYPAD_SLIDE		0x0a  /* set = keypad slide out */
 #define SW_FRONT_PROXIMITY	0x0b  /* set = front proximity sensor active */
 #define SW_MAX			0x0f
 #define SW_CNT			(SW_MAX+1)
 /*
  * Misc events
  */
 #define MSC_SERIAL		0x00
 #define MSC_PULSELED		0x01
 #define MSC_GESTURE		0x02
 #define MSC_RAW			0x03
 #define MSC_SCAN		0x04
 #define MSC_MAX			0x07
 #define MSC_CNT			(MSC_MAX+1)
 /*
  * LEDs
  */
 #define LED_NUML		0x00
 #define LED_CAPSL		0x01
 #define LED_SCROLLL		0x02
 #define LED_COMPOSE		0x03
 #define LED_KANA		0x04
 #define LED_SLEEP		0x05
 #define LED_SUSPEND		0x06
 #define LED_MUTE		0x07
 #define LED_MISC		0x08
 #define LED_MAIL		0x09
 #define LED_CHARGING		0x0a
 #define LED_MAX			0x0f
 #define LED_CNT			(LED_MAX+1)
 /*
  * Autorepeat values
  */
 #define REP_DELAY		0x00
 #define REP_PERIOD		0x01
 #define REP_MAX			0x01
 /*
  * Sounds
  */
 #define SND_CLICK		0x00
 #define SND_BELL		0x01
 #define SND_TONE		0x02
 #define SND_MAX			0x07
 #define SND_CNT			(SND_MAX+1)
 /*
  * IDs.
  */
 #define ID_BUS			0
 #define ID_VENDOR		1
 #define ID_PRODUCT		2
 #define ID_VERSION		3
 #define BUS_PCI			0x01
 #define BUS_ISAPNP		0x02
 #define BUS_USB			0x03
 #define BUS_HIL			0x04
 #define BUS_BLUETOOTH		0x05
 #define BUS_VIRTUAL		0x06
 #define BUS_ISA			0x10
 #define BUS_I8042		0x11
 #define BUS_XTKBD		0x12
 #define BUS_RS232		0x13
 #define BUS_GAMEPORT		0x14
 #define BUS_PARPORT		0x15
 #define BUS_AMIGA		0x16
 #define BUS_ADB			0x17
 #define BUS_I2C			0x18
 #define BUS_HOST		0x19
 #define BUS_GSC			0x1A
 #define BUS_ATARI		0x1B
 /*
  * MT_TOOL types
  */
 #define MT_TOOL_FINGER		0
 #define MT_TOOL_PEN		1
 /*
  * Values describing the status of a force-feedback effect
  */
 #define FF_STATUS_STOPPED	0x00
 #define FF_STATUS_PLAYING	0x01
 #define FF_STATUS_MAX		0x01
 /*
  * Structures used in ioctls to upload effects to a device
  * They are pieces of a bigger structure (called ff_effect)
  */
 /*
  * All duration values are expressed in ms. Values above 32767 ms (0x7fff)
  * should not be used and have unspecified results.
  */
 /**
  * struct ff_replay - defines scheduling of the force-feedback effect
  * @length: duration of the effect
  * @delay: delay before effect should start playing
  */
 struct ff_replay {
 	__u16 length;
 	__u16 delay;
 };
 /**
  * struct ff_trigger - defines what triggers the force-feedback effect
  * @button: number of the button triggering the effect
  * @interval: controls how soon the effect can be re-triggered
  */
 struct ff_trigger {
 	__u16 button;
 	__u16 interval;
 };
 /**
  * struct ff_envelope - generic force-feedback effect envelope
  * @attack_length: duration of the attack (ms)
  * @attack_level: level at the beginning of the attack
  * @fade_length: duration of fade (ms)
  * @fade_level: level at the end of fade
  *
  * The @attack_level and @fade_level are absolute values; when applying
  * envelope force-feedback core will convert to positive/negative
  * value based on polarity of the default level of the effect.
  * Valid range for the attack and fade levels is 0x0000 - 0x7fff
  */
 struct ff_envelope {
 	__u16 attack_length;
 	__u16 attack_level;
 	__u16 fade_length;
 	__u16 fade_level;
 };
 /**
  * struct ff_constant_effect - defines parameters of a constant force-feedback effect
  * @level: strength of the effect; may be negative
  * @envelope: envelope data
  */
 struct ff_constant_effect {
 	__s16 level;
 	struct ff_envelope envelope;
 };
 /**
  * struct ff_ramp_effect - defines parameters of a ramp force-feedback effect
  * @start_level: beginning strength of the effect; may be negative
  * @end_level: final strength of the effect; may be negative
  * @envelope: envelope data
  */
 struct ff_ramp_effect {
 	__s16 start_level;
 	__s16 end_level;
 	struct ff_envelope envelope;
 };
 /**
  * struct ff_condition_effect - defines a spring or friction force-feedback effect
  * @right_saturation: maximum level when joystick moved all way to the right
  * @left_saturation: same for the left side
  * @right_coeff: controls how fast the force grows when the joystick moves
  *	to the right
  * @left_coeff: same for the left side
  * @deadband: size of the dead zone, where no force is produced
  * @center: position of the dead zone
  */
 struct ff_condition_effect {
 	__u16 right_saturation;
 	__u16 left_saturation;
 	__s16 right_coeff;
 	__s16 left_coeff;
 	__u16 deadband;
 	__s16 center;
 };
 /**
  * struct ff_periodic_effect - defines parameters of a periodic force-feedback effect
  * @waveform: kind of the effect (wave)
  * @period: period of the wave (ms)
  * @magnitude: peak value
  * @offset: mean value of the wave (roughly)
  * @phase: 'horizontal' shift
  * @envelope: envelope data
  * @custom_len: number of samples (FF_CUSTOM only)
  * @custom_data: buffer of samples (FF_CUSTOM only)
  *
  * Known waveforms - FF_SQUARE, FF_TRIANGLE, FF_SINE, FF_SAW_UP,
  * FF_SAW_DOWN, FF_CUSTOM. The exact syntax FF_CUSTOM is undefined
  * for the time being as no driver supports it yet.
  *
  * Note: the data pointed by custom_data is copied by the driver.
  * You can therefore dispose of the memory after the upload/update.
  */
 struct ff_periodic_effect {
 	__u16 waveform;
 	__u16 period;
 	__s16 magnitude;
 	__s16 offset;
 	__u16 phase;
 	struct ff_envelope envelope;
 	__u32 custom_len;
 	__s16 __user *custom_data;
 };
 /**
  * struct ff_rumble_effect - defines parameters of a periodic force-feedback effect
  * @strong_magnitude: magnitude of the heavy motor
  * @weak_magnitude: magnitude of the light one
  *
  * Some rumble pads have two motors of different weight. Strong_magnitude
  * represents the magnitude of the vibration generated by the heavy one.
  */
 struct ff_rumble_effect {
 	__u16 strong_magnitude;
 	__u16 weak_magnitude;
 };
 /**
  * struct ff_effect - defines force feedback effect
  * @type: type of the effect (FF_CONSTANT, FF_PERIODIC, FF_RAMP, FF_SPRING,
  *	FF_FRICTION, FF_DAMPER, FF_RUMBLE, FF_INERTIA, or FF_CUSTOM)
  * @id: an unique id assigned to an effect
  * @direction: direction of the effect
  * @trigger: trigger conditions (struct ff_trigger)
  * @replay: scheduling of the effect (struct ff_replay)
  * @u: effect-specific structure (one of ff_constant_effect, ff_ramp_effect,
  *	ff_periodic_effect, ff_condition_effect, ff_rumble_effect) further
  *	defining effect parameters
  *
  * This structure is sent through ioctl from the application to the driver.
  * To create a new effect application should set its @id to -1; the kernel
  * will return assigned @id which can later be used to update or delete
  * this effect.
  *
  * Direction of the effect is encoded as follows:
  *	0 deg -> 0x0000 (down)
  *	90 deg -> 0x4000 (left)
  *	180 deg -> 0x8000 (up)
  *	270 deg -> 0xC000 (right)
  */
 struct ff_effect {
 	__u16 type;
 	__s16 id;
 	__u16 direction;
 	struct ff_trigger trigger;
 	struct ff_replay replay;
 	union {
 		struct ff_constant_effect constant;
 		struct ff_ramp_effect ramp;
 		struct ff_periodic_effect periodic;
 		struct ff_condition_effect condition[2]; /* One for each axis */
 		struct ff_rumble_effect rumble;
 	} u;
 };
 /*
  * Force feedback effect types
  */
 #define FF_RUMBLE	0x50
 #define FF_PERIODIC	0x51
 #define FF_CONSTANT	0x52
 #define FF_SPRING	0x53
 #define FF_FRICTION	0x54
 #define FF_DAMPER	0x55
 #define FF_INERTIA	0x56
 #define FF_RAMP		0x57
 #define FF_EFFECT_MIN	FF_RUMBLE
 #define FF_EFFECT_MAX	FF_RAMP
 /*
  * Force feedback periodic effect types
  */
 #define FF_SQUARE	0x58
 #define FF_TRIANGLE	0x59
 #define FF_SINE		0x5a
 #define FF_SAW_UP	0x5b
 #define FF_SAW_DOWN	0x5c
 #define FF_CUSTOM	0x5d
 #define FF_WAVEFORM_MIN	FF_SQUARE
 #define FF_WAVEFORM_MAX	FF_CUSTOM
 /*
  * Set ff device properties
  */
 #define FF_GAIN		0x60
 #define FF_AUTOCENTER	0x61
 #define FF_MAX		0x7f
 #define FF_CNT		(FF_MAX+1)
 #ifdef __KERNEL__
 /*
  * In-kernel definitions.
  */
 #include <linux/device.h>
 #include <linux/fs.h>
 #include <linux/timer.h>
 #include <linux/mod_devicetable.h>
 /**
  * struct input_dev - represents an input device
  * @name: name of the device
  * @phys: physical path to the device in the system hierarchy
  * @uniq: unique identification code for the device (if device has it)
  * @id: id of the device (struct input_id)
  * @evbit: bitmap of types of events supported by the device (EV_KEY,
  *	EV_REL, etc.)
  * @keybit: bitmap of keys/buttons this device has
  * @relbit: bitmap of relative axes for the device
  * @absbit: bitmap of absolute axes for the device
  * @mscbit: bitmap of miscellaneous events supported by the device
  * @ledbit: bitmap of leds present on the device
  * @sndbit: bitmap of sound effects supported by the device
  * @ffbit: bitmap of force feedback effects supported by the device
  * @swbit: bitmap of switches present on the device
  * @keycodemax: size of keycode table
  * @keycodesize: size of elements in keycode table
  * @keycode: map of scancodes to keycodes for this device
  * @setkeycode: optional method to alter current keymap, used to implement
  *	sparse keymaps. If not supplied default mechanism will be used.
  *	The method is being called while holding event_lock and thus must
  *	not sleep
  * @getkeycode: optional method to retrieve current keymap. If not supplied
  *	default mechanism will be used. The method is being called while
  *	holding event_lock and thus must not sleep
  * @ff: force feedback structure associated with the device if device
  *	supports force feedback effects
  * @repeat_key: stores key code of the last key pressed; used to implement
  *	software autorepeat
  * @timer: timer for software autorepeat
  * @sync: set to 1 when there were no new events since last EV_SYNC
  * @abs: current values for reports from absolute axes
  * @rep: current values for autorepeat parameters (delay, rate)
  * @key: reflects current state of device's keys/buttons
  * @led: reflects current state of device's LEDs
  * @snd: reflects current state of sound effects
  * @sw: reflects current state of device's switches
  * @absmax: maximum values for events coming from absolute axes
  * @absmin: minimum values for events coming from absolute axes
  * @absfuzz: describes noisiness for axes
  * @absflat: size of the center flat position (used by joydev)
  * @absres: resolution used for events coming form absolute axes
  * @open: this method is called when the very first user calls
  *	input_open_device(). The driver must prepare the device
  *	to start generating events (start polling thread,
  *	request an IRQ, submit URB, etc.)
  * @close: this method is called when the very last user calls
  *	input_close_device().
  * @flush: purges the device. Most commonly used to get rid of force
  *	feedback effects loaded into the device when disconnecting
  *	from it
  * @event: event handler for events sent _to_ the device, like EV_LED
  *	or EV_SND. The device is expected to carry out the requested
  *	action (turn on a LED, play sound, etc.) The call is protected
  *	by @event_lock and must not sleep
  * @grab: input handle that currently has the device grabbed (via
  *	EVIOCGRAB ioctl). When a handle grabs a device it becomes sole
  *	recipient for all input events coming from the device
  * @event_lock: this spinlock is is taken when input core receives
  *	and processes a new event for the device (in input_event()).
  *	Code that accesses and/or modifies parameters of a device
  *	(such as keymap or absmin, absmax, absfuzz, etc.) after device
  *	has been registered with input core must take this lock.
  * @mutex: serializes calls to open(), close() and flush() methods
  * @users: stores number of users (input handlers) that opened this
  *	device. It is used by input_open_device() and input_close_device()
  *	to make sure that dev->open() is only called when the first
  *	user opens device and dev->close() is called when the very
  *	last user closes the device
  * @going_away: marks devices that are in a middle of unregistering and
  *	causes input_open_device*() fail with -ENODEV.
  * @dev: driver model's view of this device
  * @h_list: list of input handles associated with the device. When
  *	accessing the list dev->mutex must be held
  * @node: used to place the device onto input_dev_list
  */
 struct input_dev {
 	const char *name;
 	const char *phys;
 	const char *uniq;
 	struct input_id id;
 	unsigned long evbit[BITS_TO_LONGS(EV_CNT)];
 	unsigned long keybit[BITS_TO_LONGS(KEY_CNT)];
 	unsigned long relbit[BITS_TO_LONGS(REL_CNT)];
 	unsigned long absbit[BITS_TO_LONGS(ABS_CNT)];
 	unsigned long mscbit[BITS_TO_LONGS(MSC_CNT)];
 	unsigned long ledbit[BITS_TO_LONGS(LED_CNT)];
 	unsigned long sndbit[BITS_TO_LONGS(SND_CNT)];
 	unsigned long ffbit[BITS_TO_LONGS(FF_CNT)];
 	unsigned long swbit[BITS_TO_LONGS(SW_CNT)];
 	unsigned int keycodemax;
 	unsigned int keycodesize;
 	void *keycode;
 	int (*setkeycode)(struct input_dev *dev, int scancode, int keycode);
 	int (*getkeycode)(struct input_dev *dev, int scancode, int *keycode);
 	struct ff_device *ff;
 	unsigned int repeat_key;
 	struct timer_list timer;
 	int sync;
 	int abs[ABS_MAX + 1];
 	int rep[REP_MAX + 1];
 	unsigned long key[BITS_TO_LONGS(KEY_CNT)];
 	unsigned long led[BITS_TO_LONGS(LED_CNT)];
 	unsigned long snd[BITS_TO_LONGS(SND_CNT)];
 	unsigned long sw[BITS_TO_LONGS(SW_CNT)];
 	int absmax[ABS_MAX + 1];
 	int absmin[ABS_MAX + 1];
 	int absfuzz[ABS_MAX + 1];
 	int absflat[ABS_MAX + 1];
 	int absres[ABS_MAX + 1];
 	int (*open)(struct input_dev *dev);
 	void (*close)(struct input_dev *dev);
 	int (*flush)(struct input_dev *dev, struct file *file);
 	int (*event)(struct input_dev *dev, unsigned int type, unsigned int code, int value);
 	struct input_handle *grab;
 	spinlock_t event_lock;
 	struct mutex mutex;
 	unsigned int users;
 	bool going_away;
 	struct device dev;
 	struct list_head	h_list;
 	struct list_head	node;
 };
 #define to_input_dev(d) container_of(d, struct input_dev, dev)
 /*
  * Verify that we are in sync with input_device_id mod_devicetable.h #defines
  */
 #if EV_MAX != INPUT_DEVICE_ID_EV_MAX
 #error "EV_MAX and INPUT_DEVICE_ID_EV_MAX do not match"
 #endif
 #if KEY_MIN_INTERESTING != INPUT_DEVICE_ID_KEY_MIN_INTERESTING
 #error "KEY_MIN_INTERESTING and INPUT_DEVICE_ID_KEY_MIN_INTERESTING do not match"
 #endif
 #if KEY_MAX != INPUT_DEVICE_ID_KEY_MAX
 #error "KEY_MAX and INPUT_DEVICE_ID_KEY_MAX do not match"
 #endif
 #if REL_MAX != INPUT_DEVICE_ID_REL_MAX
 #error "REL_MAX and INPUT_DEVICE_ID_REL_MAX do not match"
 #endif
 #if ABS_MAX != INPUT_DEVICE_ID_ABS_MAX
 #error "ABS_MAX and INPUT_DEVICE_ID_ABS_MAX do not match"
 #endif
 #if MSC_MAX != INPUT_DEVICE_ID_MSC_MAX
 #error "MSC_MAX and INPUT_DEVICE_ID_MSC_MAX do not match"
 #endif
 #if LED_MAX != INPUT_DEVICE_ID_LED_MAX
 #error "LED_MAX and INPUT_DEVICE_ID_LED_MAX do not match"
 #endif
 #if SND_MAX != INPUT_DEVICE_ID_SND_MAX
 #error "SND_MAX and INPUT_DEVICE_ID_SND_MAX do not match"
 #endif
 #if FF_MAX != INPUT_DEVICE_ID_FF_MAX
 #error "FF_MAX and INPUT_DEVICE_ID_FF_MAX do not match"
 #endif
 #if SW_MAX != INPUT_DEVICE_ID_SW_MAX
 #error "SW_MAX and INPUT_DEVICE_ID_SW_MAX do not match"
 #endif
 #define INPUT_DEVICE_ID_MATCH_DEVICE \
 	(INPUT_DEVICE_ID_MATCH_BUS | INPUT_DEVICE_ID_MATCH_VENDOR | INPUT_DEVICE_ID_MATCH_PRODUCT)
 #define INPUT_DEVICE_ID_MATCH_DEVICE_AND_VERSION \
 	(INPUT_DEVICE_ID_MATCH_DEVICE | INPUT_DEVICE_ID_MATCH_VERSION)
 struct input_handle;
 /**
  * struct input_handler - implements one of interfaces for input devices
  * @private: driver-specific data
  * @event: event handler. This method is being called by input core with
  *	interrupts disabled and dev->event_lock spinlock held and so
  *	it may not sleep
  * @connect: called when attaching a handler to an input device
  * @disconnect: disconnects a handler from input device
  * @start: starts handler for given handle. This function is called by
  *	input core right after connect() method and also when a process
  *	that "grabbed" a device releases it
  * @fops: file operations this driver implements
  * @minor: beginning of range of 32 minors for devices this driver
  *	can provide
  * @name: name of the handler, to be shown in /proc/bus/input/handlers
  * @id_table: pointer to a table of input_device_ids this driver can
  *	handle
  * @blacklist: pointer to a table of input_device_ids this driver should
  *	ignore even if they match @id_table
  * @h_list: list of input handles associated with the handler
  * @node: for placing the driver onto input_handler_list
  *
  * Input handlers attach to input devices and create input handles. There
  * are likely several handlers attached to any given input device at the
  * same time. All of them will get their copy of input event generated by
  * the device.
  *
  * Note that input core serializes calls to connect() and disconnect()
  * methods.
  */
 struct input_handler {
 	void *private;
 	void (*event)(struct input_handle *handle, unsigned int type, unsigned int code, int value);
 	int (*connect)(struct input_handler *handler, struct input_dev *dev, const struct input_device_id *id);
 	void (*disconnect)(struct input_handle *handle);
 	void (*start)(struct input_handle *handle);
 	const struct file_operations *fops;
 	int minor;
 	const char *name;
 	const struct input_device_id *id_table;
 	const struct input_device_id *blacklist;
 	struct list_head	h_list;
 	struct list_head	node;
 };
 /**
  * struct input_handle - links input device with an input handler
  * @private: handler-specific data
  * @open: counter showing whether the handle is 'open', i.e. should deliver
  *	events from its device
  * @name: name given to the handle by handler that created it
  * @dev: input device the handle is attached to
  * @handler: handler that works with the device through this handle
  * @d_node: used to put the handle on device's list of attached handles
  * @h_node: used to put the handle on handler's list of handles from which
  *	it gets events
  */
 struct input_handle {
 	void *private;
 	int open;
 	const char *name;
 	struct input_dev *dev;
 	struct input_handler *handler;
 	struct list_head	d_node;
 	struct list_head	h_node;
 };
 struct input_dev *input_allocate_device(void);
 void input_free_device(struct input_dev *dev);
 static inline struct input_dev *input_get_device(struct input_dev *dev)
 {
 	return dev ? to_input_dev(get_device(&dev->dev)) : NULL;
 }
 static inline void input_put_device(struct input_dev *dev)
 {
 	if (dev)
 		put_device(&dev->dev);
 }
 static inline void *input_get_drvdata(struct input_dev *dev)
 {
 	return dev_get_drvdata(&dev->dev);
 }
 static inline void input_set_drvdata(struct input_dev *dev, void *data)
 {
 	dev_set_drvdata(&dev->dev, data);
 }
 int __must_check input_register_device(struct input_dev *);
 void input_unregister_device(struct input_dev *);
 int __must_check input_register_handler(struct input_handler *);
 void input_unregister_handler(struct input_handler *);
 int input_handler_for_each_handle(struct input_handler *, void *data,
 				  int (*fn)(struct input_handle *, void *));
 int input_register_handle(struct input_handle *);
 void input_unregister_handle(struct input_handle *);
 int input_grab_device(struct input_handle *);
 void input_release_device(struct input_handle *);
 int input_open_device(struct input_handle *);
 void input_close_device(struct input_handle *);
 int input_flush_device(struct input_handle* handle, struct file* file);
 void input_event(struct input_dev *dev, unsigned int type, unsigned int code, int value);
 void input_inject_event(struct input_handle *handle, unsigned int type, unsigned int code, int value);
 static inline void input_report_key(struct input_dev *dev, unsigned int code, int value)
 {
 	input_event(dev, EV_KEY, code, !!value);
 }
 static inline void input_report_rel(struct input_dev *dev, unsigned int code, int value)
 {
 	input_event(dev, EV_REL, code, value);
 }
 static inline void input_report_abs(struct input_dev *dev, unsigned int code, int value)
 {
 	input_event(dev, EV_ABS, code, value);
 }
 static inline void input_report_ff_status(struct input_dev *dev, unsigned int code, int value)
 {
 	input_event(dev, EV_FF_STATUS, code, value);
 }
 static inline void input_report_switch(struct input_dev *dev, unsigned int code, int value)
 {
 	input_event(dev, EV_SW, code, !!value);
 }
 static inline void input_sync(struct input_dev *dev)
 {
 	input_event(dev, EV_SYN, SYN_REPORT, 0);
 }
 static inline void input_mt_sync(struct input_dev *dev)
 {
 	input_event(dev, EV_SYN, SYN_MT_REPORT, 0);
 }
 void input_set_capability(struct input_dev *dev, unsigned int type, unsigned int code);
 static inline void input_set_abs_params(struct input_dev *dev, int axis, int min, int max, int fuzz, int flat)
 {
 	dev->absmin[axis] = min;
 	dev->absmax[axis] = max;
 	dev->absfuzz[axis] = fuzz;
 	dev->absflat[axis] = flat;
 	dev->absbit[BIT_WORD(axis)] |= BIT_MASK(axis);
 }
 int input_get_keycode(struct input_dev *dev, int scancode, int *keycode);
 int input_set_keycode(struct input_dev *dev, int scancode, int keycode);
 extern struct class input_class;
 /**
  * struct ff_device - force-feedback part of an input device
  * @upload: Called to upload an new effect into device
  * @erase: Called to erase an effect from device
  * @playback: Called to request device to start playing specified effect
  * @set_gain: Called to set specified gain
  * @set_autocenter: Called to auto-center device
  * @destroy: called by input core when parent input device is being
  *	destroyed
  * @private: driver-specific data, will be freed automatically
  * @ffbit: bitmap of force feedback capabilities truly supported by
  *	device (not emulated like ones in input_dev->ffbit)
  * @mutex: mutex for serializing access to the device
  * @max_effects: maximum number of effects supported by device
  * @effects: pointer to an array of effects currently loaded into device
  * @effect_owners: array of effect owners; when file handle owning
  *	an effect gets closed the effect is automatically erased
  *
  * Every force-feedback device must implement upload() and playback()
  * methods; erase() is optional. set_gain() and set_autocenter() need
  * only be implemented if driver sets up FF_GAIN and FF_AUTOCENTER
  * bits.
  *
  * Note that playback(), set_gain() and set_autocenter() are called with
  * dev->event_lock spinlock held and interrupts off and thus may not
  * sleep.
  */
 struct ff_device {
 	int (*upload)(struct input_dev *dev, struct ff_effect *effect,
 		      struct ff_effect *old);
 	int (*erase)(struct input_dev *dev, int effect_id);
 	int (*playback)(struct input_dev *dev, int effect_id, int value);
 	void (*set_gain)(struct input_dev *dev, u16 gain);
 	void (*set_autocenter)(struct input_dev *dev, u16 magnitude);
 	void (*destroy)(struct ff_device *);
 	void *private;
 	unsigned long ffbit[BITS_TO_LONGS(FF_CNT)];
 	struct mutex mutex;
 	int max_effects;
 	struct ff_effect *effects;
 	struct file *effect_owners[];
 };
 int input_ff_create(struct input_dev *dev, int max_effects);
 void input_ff_destroy(struct input_dev *dev);
 int input_ff_event(struct input_dev *dev, unsigned int type, unsigned int code, int value);
 int input_ff_upload(struct input_dev *dev, struct ff_effect *effect, struct file *file);
 int input_ff_erase(struct input_dev *dev, int effect_id, struct file *file);
 int input_ff_create_memless(struct input_dev *dev, void *data,
 		int (*play_effect)(struct input_dev *, void *, struct ff_effect *));
 #endif
 #endif