/* * 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/input.h>#include <linux/module.h>#include <linux/random.h>#include <linux/major.h>#include <linux/proc_fs.h>#include <linux/seq_file.h>#include <linux/interrupt.h>#include <linux/poll.h>#include <linux/device.h>#include <linux/mutex.h> MODULE_AUTHOR("Vojtech Pavlik <vojtech@suse.cz>");MODULE_DESCRIPTION("Input core");MODULE_LICENSE("GPL"); #define INPUT_DEVICES	256 static LIST_HEAD(input_dev_list);static LIST_HEAD(input_handler_list); static struct input_handler *input_table[8]; /** * 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 * See also input_inject_event() */void input_event(struct input_dev *dev, unsigned int type, unsigned int code, int value){	struct input_handle *handle; 	if (type > EV_MAX || !test_bit(type, dev->evbit))		return; 	add_input_randomness(type, code, value); 	switch (type) { 		case EV_SYN:			switch (code) {				case SYN_CONFIG:					if (dev->event)						dev->event(dev, type, code, value);					break; 				case SYN_REPORT:					if (dev->sync)						return;					dev->sync = 1;					break;			}			break; 		case EV_KEY: 			if (code > KEY_MAX || !test_bit(code, dev->keybit) || !!test_bit(code, dev->key) == value)				return; 			if (value == 2)				break; 			change_bit(code, dev->key); 			if (test_bit(EV_REP, dev->evbit) && dev->rep[REP_PERIOD] && dev->rep[REP_DELAY] && dev->timer.data && value) {				dev->repeat_key = code;				mod_timer(&dev->timer, jiffies + msecs_to_jiffies(dev->rep[REP_DELAY]));			} 			break; 		case EV_SW: 			if (code > SW_MAX || !test_bit(code, dev->swbit) || !!test_bit(code, dev->sw) == value)				return; 			change_bit(code, dev->sw); 			break; 		case EV_ABS: 			if (code > ABS_MAX || !test_bit(code, dev->absbit))				return; 			if (dev->absfuzz[code]) {				if ((value > dev->abs[code] - (dev->absfuzz[code] >> 1)) &&				    (value < dev->abs[code] + (dev->absfuzz[code] >> 1)))					return; 				if ((value > dev->abs[code] - dev->absfuzz[code]) &&				    (value < dev->abs[code] + dev->absfuzz[code]))					value = (dev->abs[code] * 3 + value) >> 2; 				if ((value > dev->abs[code] - (dev->absfuzz[code] << 1)) &&				    (value < dev->abs[code] + (dev->absfuzz[code] << 1)))					value = (dev->abs[code] + value) >> 1;			} 			if (dev->abs[code] == value)				return; 			dev->abs[code] = value;			break; 		case EV_REL: 			if (code > REL_MAX || !test_bit(code, dev->relbit) || (value == 0))				return; 			break; 		case EV_MSC: 			if (code > MSC_MAX || !test_bit(code, dev->mscbit))				return; 			if (dev->event)				dev->event(dev, type, code, value); 			break; 		case EV_LED: 			if (code > LED_MAX || !test_bit(code, dev->ledbit) || !!test_bit(code, dev->led) == value)				return; 			change_bit(code, dev->led); 			if (dev->event)				dev->event(dev, type, code, value); 			break; 		case EV_SND: 			if (code > SND_MAX || !test_bit(code, dev->sndbit))				return; 			if (!!test_bit(code, dev->snd) != !!value)				change_bit(code, dev->snd); 			if (dev->event)				dev->event(dev, type, code, value); 			break; 		case EV_REP: 			if (code > REP_MAX || value < 0 || dev->rep[code] == value)				return; 			dev->rep[code] = value;			if (dev->event)				dev->event(dev, type, code, value); 			break; 		case EV_FF: 			if (value < 0)				return; 			if (dev->event)				dev->event(dev, type, code, value);			break;	} 	if (type != EV_SYN)		dev->sync = 0; 	if (dev->grab)		dev->grab->handler->event(dev->grab, type, code, value);	else		list_for_each_entry(handle, &dev->h_list, d_node)			if (handle->open)				handle->handler->event(handle, type, code, value);}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){	if (!handle->dev->grab || handle->dev->grab == handle)		input_event(handle->dev, type, code, value);}EXPORT_SYMBOL(input_inject_event); static void input_repeat_key(unsigned long data){	struct input_dev *dev = (void *) data; 	if (!test_bit(dev->repeat_key, dev->key))		return; 	input_event(dev, EV_KEY, dev->repeat_key, 2);	input_sync(dev); 	if (dev->rep[REP_PERIOD])		mod_timer(&dev->timer, jiffies + msecs_to_jiffies(dev->rep[REP_PERIOD]));} int input_grab_device(struct input_handle *handle){	if (handle->dev->grab)		return -EBUSY; 	handle->dev->grab = handle;	return 0;}EXPORT_SYMBOL(input_grab_device); void input_release_device(struct input_handle *handle){	struct input_dev *dev = handle->dev; 	if (dev->grab == handle) {		dev->grab = NULL; 		list_for_each_entry(handle, &dev->h_list, d_node)			if (handle->handler->start)				handle->handler->start(handle);	}}EXPORT_SYMBOL(input_release_device); int input_open_device(struct input_handle *handle){	struct input_dev *dev = handle->dev;	int err; 	err = mutex_lock_interruptible(&dev->mutex);	if (err)		return err; 	handle->open++; 	if (!dev->users++ && dev->open)		err = dev->open(dev); 	if (err)		handle->open--; 	mutex_unlock(&dev->mutex); 	return err;}EXPORT_SYMBOL(input_open_device); int input_flush_device(struct input_handle* handle, struct file* file){	if (handle->dev->flush)		return handle->dev->flush(handle->dev, file); 	return 0;}EXPORT_SYMBOL(input_flush_device); void input_close_device(struct input_handle *handle){	struct input_dev *dev = handle->dev; 	input_release_device(handle); 	mutex_lock(&dev->mutex); 	if (!--dev->users && dev->close)		dev->close(dev);	handle->open--; 	mutex_unlock(&dev->mutex);}EXPORT_SYMBOL(input_close_device); 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 < 0 || 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 < 0 || scancode >= dev->keycodemax)		return -EINVAL; 	if (keycode < 0 || keycode > KEY_MAX)		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;}  #define MATCH_BIT(bit, max) \		for (i = 0; i < NBITS(max); i++) \			if ((id->bit[i] & dev->bit[i]) != id->bit[i]) \				break; \		if (i != NBITS(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->cdev.kobj), error); 	return error;}  #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){	int state = input_devices_state; 	poll_wait(file, &input_devices_poll_wait, wait);	if (state != input_devices_state)		return POLLIN | POLLRDNORM; 	return 0;} static struct list_head *list_get_nth_element(struct list_head *list, loff_t *pos){	struct list_head *node;	loff_t i = 0; 	list_for_each(node, list)		if (i++ == *pos)			return node; 	return NULL;} static struct list_head *list_get_next_element(struct list_head *list, struct list_head *element, loff_t *pos){	if (element->next == list)		return NULL; 	++(*pos);	return element->next;} static void *input_devices_seq_start(struct seq_file *seq, loff_t *pos){	/* acquire lock here ... Yes, we do need locking, I knowi, I know... */ 	return list_get_nth_element(&input_dev_list, pos);}

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