/* * 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/sched.h>#include <linux/smp_lock.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 * @handle: 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 (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 void input_link_handle(struct input_handle *handle){	list_add_tail(&handle->d_node, &handle->dev->h_list);	list_add_tail(&handle->h_node, &handle->handler->h_list);} #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 struct input_device_id *input_match_device(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;} #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);} static void *input_devices_seq_next(struct seq_file *seq, void *v, loff_t *pos){	return list_get_next_element(&input_dev_list, v, pos);} static void input_devices_seq_stop(struct seq_file *seq, void *v){	/* release lock here */} static void input_seq_print_bitmap(struct seq_file *seq, const char *name,				   unsigned long *bitmap, int max){	int i; 	for (i = NBITS(max) - 1; i > 0; i--)		if (bitmap[i])			break; 	seq_printf(seq, "B: %s=", name);	for (; i >= 0; i--)		seq_printf(seq, "%lx%s", bitmap[i], i > 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->cdev.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, "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 struct seq_operations input_devices_seq_ops = {	.start	= input_devices_seq_start,	.next	= input_devices_seq_next,	.stop	= input_devices_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 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){	/* acquire lock here ... Yes, we do need locking, I knowi, I know... */	seq->private = (void *)(unsigned long)*pos;	return list_get_nth_element(&input_handler_list, pos);} static void *input_handlers_seq_next(struct seq_file *seq, void *v, loff_t *pos){	seq->private = (void *)(unsigned long)(*pos + 1);	return list_get_next_element(&input_handler_list, v, pos);}

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