[linux-block.git] / drivers / input / input.c

/*
 * 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/kobject_uevent.h>
#include <linux/interrupt.h>
#include <linux/poll.h>
#include <linux/device.h>

MODULE_AUTHOR("Vojtech Pavlik <vojtech@suse.cz>");
MODULE_DESCRIPTION("Input core");
MODULE_LICENSE("GPL");

EXPORT_SYMBOL(input_register_device);
EXPORT_SYMBOL(input_unregister_device);
EXPORT_SYMBOL(input_register_handler);
EXPORT_SYMBOL(input_unregister_handler);
EXPORT_SYMBOL(input_grab_device);
EXPORT_SYMBOL(input_release_device);
EXPORT_SYMBOL(input_open_device);
EXPORT_SYMBOL(input_close_device);
EXPORT_SYMBOL(input_accept_process);
EXPORT_SYMBOL(input_flush_device);
EXPORT_SYMBOL(input_event);
EXPORT_SYMBOL(input_class);

#define INPUT_DEVICES	256

static LIST_HEAD(input_dev_list);
static LIST_HEAD(input_handler_list);

static struct input_handler *input_table[8];

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 (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);
}

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_accept_process(struct input_handle *handle, struct file *file)
{
	if (handle->dev->accept)
		return handle->dev->accept(handle->dev, file);

	return 0;
}

int input_grab_device(struct input_handle *handle)
{
	if (handle->dev->grab)
		return -EBUSY;

	handle->dev->grab = handle;
	return 0;
}

void input_release_device(struct input_handle *handle)
{
	if (handle->dev->grab == handle)
		handle->dev->grab = NULL;
}

int input_open_device(struct input_handle *handle)
{
	struct input_dev *dev = handle->dev;
	int err;

	err = down_interruptible(&dev->sem);
	if (err)
		return err;

	handle->open++;

	if (!dev->users++ && dev->open)
		err = dev->open(dev);

	if (err)
		handle->open--;

	up(&dev->sem);

	return err;
}

int input_flush_device(struct input_handle* handle, struct file* file)
{
	if (handle->dev->flush)
		return handle->dev->flush(handle->dev, file);

	return 0;
}

void input_close_device(struct input_handle *handle)
{
	struct input_dev *dev = handle->dev;

	input_release_device(handle);

	down(&dev->sem);

	if (!--dev->users && dev->close)
		dev->close(dev);
	handle->open--;

	up(&dev->sem);
}

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->id.bustype != dev->id.bustype)
				continue;

		if (id->flags & INPUT_DEVICE_ID_MATCH_VENDOR)
			if (id->id.vendor != dev->id.vendor)
				continue;

		if (id->flags & INPUT_DEVICE_ID_MATCH_PRODUCT)
			if (id->id.product != dev->id.product)
				continue;

		if (id->flags & INPUT_DEVICE_ID_MATCH_VERSION)
			if (id->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;
}


/*
 * Input hotplugging interface - loading event handlers based on
 * device bitfields.
 */

#ifdef CONFIG_HOTPLUG

/*
 * Input hotplugging invokes what /proc/sys/kernel/hotplug says
 * (normally /sbin/hotplug) when input devices get added or removed.
 *
 * This invokes a user mode policy agent, typically helping to load driver
 * or other modules, configure the device, and more.  Drivers can provide
 * a MODULE_DEVICE_TABLE to help with module loading subtasks.
 *
 */

#define SPRINTF_BIT_A(bit, name, max) \
	do { \
		envp[i++] = scratch; \
		scratch += sprintf(scratch, name); \
		for (j = NBITS(max) - 1; j >= 0; j--) \
			if (dev->bit[j]) break; \
		for (; j >= 0; j--) \
			scratch += sprintf(scratch, "%lx ", dev->bit[j]); \
		scratch++; \
	} while (0)

#define SPRINTF_BIT_A2(bit, name, max, ev) \
	do { \
		if (test_bit(ev, dev->evbit)) \
			SPRINTF_BIT_A(bit, name, max); \
	} while (0)

static void input_call_hotplug(char *verb, struct input_dev *dev)
{
	char *argv[3], **envp, *buf, *scratch;
	int i = 0, j, value;

	if (!hotplug_path[0]) {
		printk(KERN_ERR "input.c: calling hotplug without a hotplug agent defined\n");
		return;
	}
	if (in_interrupt()) {
		printk(KERN_ERR "input.c: calling hotplug from interrupt\n");
		return;
	}
	if (!current->fs->root) {
		printk(KERN_WARNING "input.c: calling hotplug without valid filesystem\n");
		return;
	}
	if (!(envp = (char **) kmalloc(20 * sizeof(char *), GFP_KERNEL))) {
		printk(KERN_ERR "input.c: not enough memory allocating hotplug environment\n");
		return;
	}
	if (!(buf = kmalloc(1024, GFP_KERNEL))) {
		kfree (envp);
		printk(KERN_ERR "input.c: not enough memory allocating hotplug environment\n");
		return;
	}

	argv[0] = hotplug_path;
	argv[1] = "input";
	argv[2] = NULL;

	envp[i++] = "HOME=/";
	envp[i++] = "PATH=/sbin:/bin:/usr/sbin:/usr/bin";

	scratch = buf;

	envp[i++] = scratch;
	scratch += sprintf(scratch, "ACTION=%s", verb) + 1;

	envp[i++] = scratch;
	scratch += sprintf(scratch, "PRODUCT=%x/%x/%x/%x",
		dev->id.bustype, dev->id.vendor, dev->id.product, dev->id.version) + 1;

	if (dev->name) {
		envp[i++] = scratch;
		scratch += sprintf(scratch, "NAME=%s", dev->name) + 1;
	}

	if (dev->phys) {
		envp[i++] = scratch;
		scratch += sprintf(scratch, "PHYS=%s", dev->phys) + 1;
	}

	SPRINTF_BIT_A(evbit, "EV=", EV_MAX);
	SPRINTF_BIT_A2(keybit, "KEY=", KEY_MAX, EV_KEY);
	SPRINTF_BIT_A2(relbit, "REL=", REL_MAX, EV_REL);
	SPRINTF_BIT_A2(absbit, "ABS=", ABS_MAX, EV_ABS);
	SPRINTF_BIT_A2(mscbit, "MSC=", MSC_MAX, EV_MSC);
	SPRINTF_BIT_A2(ledbit, "LED=", LED_MAX, EV_LED);
	SPRINTF_BIT_A2(sndbit, "SND=", SND_MAX, EV_SND);
	SPRINTF_BIT_A2(ffbit,  "FF=",  FF_MAX, EV_FF);
	SPRINTF_BIT_A2(swbit,  "SW=",  SW_MAX, EV_SW);

	envp[i++] = NULL;

#ifdef INPUT_DEBUG
	printk(KERN_DEBUG "input.c: calling %s %s [%s %s %s %s %s]\n",
		argv[0], argv[1], envp[0], envp[1], envp[2], envp[3], envp[4]);
#endif

	value = call_usermodehelper(argv [0], argv, envp, 0);

	kfree(buf);
	kfree(envp);

#ifdef INPUT_DEBUG
	if (value != 0)
		printk(KERN_DEBUG "input.c: hotplug returned %d\n", value);
#endif
}

#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_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;
}

#define SPRINTF_BIT_B(bit, name, max) \
	do { \
		len += sprintf(buf + len, "B: %s", name); \
		for (i = NBITS(max) - 1; i >= 0; i--) \
			if (dev->bit[i]) break; \
		for (; i >= 0; i--) \
			len += sprintf(buf + len, "%lx ", dev->bit[i]); \
		len += sprintf(buf + len, "\n"); \
	} while (0)

#define SPRINTF_BIT_B2(bit, name, max, ev) \
	do { \
		if (test_bit(ev, dev->evbit)) \
			SPRINTF_BIT_B(bit, name, max); \
	} while (0)

static int input_devices_read(char *buf, char **start, off_t pos, int count, int *eof, void *data)
{
	struct input_dev *dev;
	struct input_handle *handle;

	off_t at = 0;
	int i, len, cnt = 0;

	list_for_each_entry(dev, &input_dev_list, node) {

		len = sprintf(buf, "I: Bus=%04x Vendor=%04x Product=%04x Version=%04x\n",
			dev->id.bustype, dev->id.vendor, dev->id.product, dev->id.version);

		len += sprintf(buf + len, "N: Name=\"%s\"\n", dev->name ? dev->name : "");
		len += sprintf(buf + len, "P: Phys=%s\n", dev->phys ? dev->phys : "");
		len += sprintf(buf + len, "H: Handlers=");

		list_for_each_entry(handle, &dev->h_list, d_node)
			len += sprintf(buf + len, "%s ", handle->name);

		len += sprintf(buf + len, "\n");

		SPRINTF_BIT_B(evbit, "EV=", EV_MAX);
		SPRINTF_BIT_B2(keybit, "KEY=", KEY_MAX, EV_KEY);
		SPRINTF_BIT_B2(relbit, "REL=", REL_MAX, EV_REL);
		SPRINTF_BIT_B2(absbit, "ABS=", ABS_MAX, EV_ABS);
		SPRINTF_BIT_B2(mscbit, "MSC=", MSC_MAX, EV_MSC);
		SPRINTF_BIT_B2(ledbit, "LED=", LED_MAX, EV_LED);
		SPRINTF_BIT_B2(sndbit, "SND=", SND_MAX, EV_SND);
		SPRINTF_BIT_B2(ffbit,  "FF=",  FF_MAX, EV_FF);
		SPRINTF_BIT_B2(swbit,  "SW=",  SW_MAX, EV_SW);

		len += sprintf(buf + len, "\n");

		at += len;

		if (at >= pos) {
			if (!*start) {
				*start = buf + (pos - (at - len));
				cnt = at - pos;
			} else  cnt += len;
			buf += len;
			if (cnt >= count)
				break;
		}
	}

	if (&dev->node == &input_dev_list)
		*eof = 1;

	return (count > cnt) ? cnt : count;
}

static int input_handlers_read(char *buf, char **start, off_t pos, int count, int *eof, void *data)
{
	struct input_handler *handler;

	off_t at = 0;
	int len = 0, cnt = 0;
	int i = 0;

	list_for_each_entry(handler, &input_handler_list, node) {

		if (handler->fops)
			len = sprintf(buf, "N: Number=%d Name=%s Minor=%d\n",
				i++, handler->name, handler->minor);
		else
			len = sprintf(buf, "N: Number=%d Name=%s\n",
				i++, handler->name);

		at += len;

		if (at >= pos) {
			if (!*start) {
				*start = buf + (pos - (at - len));
				cnt = at - pos;
			} else  cnt += len;
			buf += len;
			if (cnt >= count)
				break;
		}
	}
	if (&handler->node == &input_handler_list)
		*eof = 1;

	return (count > cnt) ? cnt : count;
}

static struct file_operations input_fileops;

static int __init input_proc_init(void)
{
	struct proc_dir_entry *entry;

	proc_bus_input_dir = proc_mkdir("input", proc_bus);
	if (!proc_bus_input_dir)
		return -ENOMEM;

	proc_bus_input_dir->owner = THIS_MODULE;

	entry = create_proc_read_entry("devices", 0, proc_bus_input_dir, input_devices_read, NULL);
	if (!entry)
		goto fail1;

	entry->owner = THIS_MODULE;
	input_fileops = *entry->proc_fops;
	entry->proc_fops = &input_fileops;
	entry->proc_fops->poll = input_devices_poll;

	entry = create_proc_read_entry("handlers", 0, proc_bus_input_dir, input_handlers_read, NULL);
	if (!entry)
		goto fail2;

	entry->owner = THIS_MODULE;

	return 0;

 fail2:	remove_proc_entry("devices", proc_bus_input_dir);
 fail1: remove_proc_entry("input", proc_bus);
	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("input", proc_bus);
}

#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

void input_register_device(struct input_dev *dev)
{
	struct input_handle *handle;
	struct input_handler *handler;
	struct input_device_id *id;

	set_bit(EV_SYN, dev->evbit);

	init_MUTEX(&dev->sem);

	/*
	 * 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;
	}

	INIT_LIST_HEAD(&dev->h_list);
	list_add_tail(&dev->node, &input_dev_list);

	list_for_each_entry(handler, &input_handler_list, node)
		if (!handler->blacklist || !input_match_device(handler->blacklist, dev))
			if ((id = input_match_device(handler->id_table, dev)))
				if ((handle = handler->connect(handler, dev, id)))
					input_link_handle(handle);

#ifdef CONFIG_HOTPLUG
	input_call_hotplug("add", dev);
#endif

	input_wakeup_procfs_readers();
}

void input_unregister_device(struct input_dev *dev)
{
	struct list_head * node, * next;

	if (!dev) return;

	del_timer_sync(&dev->timer);

	list_for_each_safe(node, next, &dev->h_list) {
		struct input_handle * handle = to_handle(node);
		list_del_init(&handle->d_node);
		list_del_init(&handle->h_node);
		handle->handler->disconnect(handle);
	}

#ifdef CONFIG_HOTPLUG
	input_call_hotplug("remove", dev);
#endif

	list_del_init(&dev->node);

	input_wakeup_procfs_readers();
}

void input_register_handler(struct input_handler *handler)
{
	struct input_dev *dev;
	struct input_handle *handle;
	struct input_device_id *id;

	if (!handler) return;

	INIT_LIST_HEAD(&handler->h_list);

	if (handler->fops != NULL)
		input_table[handler->minor >> 5] = handler;

	list_add_tail(&handler->node, &input_handler_list);

	list_for_each_entry(dev, &input_dev_list, node)
		if (!handler->blacklist || !input_match_device(handler->blacklist, dev))
			if ((id = input_match_device(handler->id_table, dev)))
				if ((handle = handler->connect(handler, dev, id)))
					input_link_handle(handle);

	input_wakeup_procfs_readers();
}

void input_unregister_handler(struct input_handler *handler)
{
	struct list_head * node, * next;

	list_for_each_safe(node, next, &handler->h_list) {
		struct input_handle * handle = to_handle_h(node);
		list_del_init(&handle->h_node);
		list_del_init(&handle->d_node);
		handler->disconnect(handle);
	}

	list_del_init(&handler->node);

	if (handler->fops != NULL)
		input_table[handler->minor >> 5] = NULL;

	input_wakeup_procfs_readers();
}

static int input_open_file(struct inode *inode, struct file *file)
{
	struct input_handler *handler = input_table[iminor(inode) >> 5];
	struct file_operations *old_fops, *new_fops = NULL;
	int err;

	/* No load-on-demand here? */
	if (!handler || !(new_fops = fops_get(handler->fops)))
		return -ENODEV;

	/*
	 * That's _really_ odd. Usually NULL ->open means "nothing special",
	 * not "no device". Oh, well...
	 */
	if (!new_fops->open) {
		fops_put(new_fops);
		return -ENODEV;
	}
	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);
	return err;
}

static struct file_operations input_fops = {
	.owner = THIS_MODULE,
	.open = input_open_file,
};

struct class *input_class;

static int __init input_init(void)
{
	int err;

	input_class = class_create(THIS_MODULE, "input");
	if (IS_ERR(input_class)) {
		printk(KERN_ERR "input: unable to register input class\n");
		return PTR_ERR(input_class);
	}

	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_destroy(input_class);
	return err;
}

static void __exit input_exit(void)
{
	input_proc_exit();
	unregister_chrdev(INPUT_MAJOR, "input");
	class_destroy(input_class);
}

subsys_initcall(input_init);
module_exit(input_exit);
Commit	Line	Data
1da177e4 LT	1	/*
	2	* The input core
	3	*
	4	* Copyright (c) 1999-2002 Vojtech Pavlik
	5	*/
	6
	7	/*
	8	* This program is free software; you can redistribute it and/or modify it
	9	* under the terms of the GNU General Public License version 2 as published by
	10	* the Free Software Foundation.
	11	*/
	12
	13	#include <linux/init.h>
	14	#include <linux/sched.h>
	15	#include <linux/smp_lock.h>
	16	#include <linux/input.h>
	17	#include <linux/module.h>
	18	#include <linux/random.h>
	19	#include <linux/major.h>
	20	#include <linux/proc_fs.h>
	21	#include <linux/kobject_uevent.h>
	22	#include <linux/interrupt.h>
	23	#include <linux/poll.h>
	24	#include <linux/device.h>
1da177e4 LT	25
	26	MODULE_AUTHOR("Vojtech Pavlik <vojtech@suse.cz>");
	27	MODULE_DESCRIPTION("Input core");
	28	MODULE_LICENSE("GPL");
	29
	30	EXPORT_SYMBOL(input_register_device);
	31	EXPORT_SYMBOL(input_unregister_device);
	32	EXPORT_SYMBOL(input_register_handler);
	33	EXPORT_SYMBOL(input_unregister_handler);
	34	EXPORT_SYMBOL(input_grab_device);
	35	EXPORT_SYMBOL(input_release_device);
	36	EXPORT_SYMBOL(input_open_device);
	37	EXPORT_SYMBOL(input_close_device);
	38	EXPORT_SYMBOL(input_accept_process);
	39	EXPORT_SYMBOL(input_flush_device);
	40	EXPORT_SYMBOL(input_event);
	41	EXPORT_SYMBOL(input_class);
	42
	43	#define INPUT_DEVICES 256
	44
	45	static LIST_HEAD(input_dev_list);
	46	static LIST_HEAD(input_handler_list);
	47
	48	static struct input_handler *input_table[8];
	49
1da177e4 LT	50	void input_event(struct input_dev *dev, unsigned int type, unsigned int code, int value)
	51	{
	52	struct input_handle *handle;
	53
	54	if (type > EV_MAX \|\| !test_bit(type, dev->evbit))
	55	return;
	56
	57	add_input_randomness(type, code, value);
	58
	59	switch (type) {
	60
	61	case EV_SYN:
	62	switch (code) {
	63	case SYN_CONFIG:
	64	if (dev->event) dev->event(dev, type, code, value);
	65	break;
	66
	67	case SYN_REPORT:
	68	if (dev->sync) return;
	69	dev->sync = 1;
	70	break;
	71	}
	72	break;
	73
	74	case EV_KEY:
	75
	76	if (code > KEY_MAX \|\| !test_bit(code, dev->keybit) \|\| !!test_bit(code, dev->key) == value)
	77	return;
	78
	79	if (value == 2)
	80	break;
	81
	82	change_bit(code, dev->key);
	83
	84	if (test_bit(EV_REP, dev->evbit) && dev->rep[REP_PERIOD] && dev->rep[REP_DELAY] && dev->timer.data && value) {
	85	dev->repeat_key = code;
	86	mod_timer(&dev->timer, jiffies + msecs_to_jiffies(dev->rep[REP_DELAY]));
	87	}
	88
	89	break;
	90
31581066 RP	91	case EV_SW:
	92
	93	if (code > SW_MAX \|\| !test_bit(code, dev->swbit) \|\| !!test_bit(code, dev->sw) == value)
	94	return;
	95
	96	change_bit(code, dev->sw);
	97
	98	break;
	99
1da177e4 LT	100	case EV_ABS:
	101
	102	if (code > ABS_MAX \|\| !test_bit(code, dev->absbit))
	103	return;
	104
	105	if (dev->absfuzz[code]) {
	106	if ((value > dev->abs[code] - (dev->absfuzz[code] >> 1)) &&
	107	(value < dev->abs[code] + (dev->absfuzz[code] >> 1)))
	108	return;
	109
	110	if ((value > dev->abs[code] - dev->absfuzz[code]) &&
	111	(value < dev->abs[code] + dev->absfuzz[code]))
	112	value = (dev->abs[code] * 3 + value) >> 2;
	113
	114	if ((value > dev->abs[code] - (dev->absfuzz[code] << 1)) &&
	115	(value < dev->abs[code] + (dev->absfuzz[code] << 1)))
	116	value = (dev->abs[code] + value) >> 1;
	117	}
	118
	119	if (dev->abs[code] == value)
	120	return;
	121
	122	dev->abs[code] = value;
	123	break;
	124
	125	case EV_REL:
	126
	127	if (code > REL_MAX \|\| !test_bit(code, dev->relbit) \|\| (value == 0))
	128	return;
	129
	130	break;
	131
	132	case EV_MSC:
	133
	134	if (code > MSC_MAX \|\| !test_bit(code, dev->mscbit))
	135	return;
	136
	137	if (dev->event) dev->event(dev, type, code, value);
	138
	139	break;
	140
	141	case EV_LED:
	142
	143	if (code > LED_MAX \|\| !test_bit(code, dev->ledbit) \|\| !!test_bit(code, dev->led) == value)
	144	return;
	145
	146	change_bit(code, dev->led);
	147	if (dev->event) dev->event(dev, type, code, value);
	148
	149	break;
	150
	151	case EV_SND:
	152
	153	if (code > SND_MAX \|\| !test_bit(code, dev->sndbit))
	154	return;
	155
	156	if (dev->event) dev->event(dev, type, code, value);
	157
	158	break;
	159
	160	case EV_REP:
	161
	162	if (code > REP_MAX \|\| value < 0 \|\| dev->rep[code] == value) return;
	163
164	dev->rep[code] = value;
165	if (dev->event) dev->event(dev, type, code, value);
166
167	break;
168
169	case EV_FF:
170	if (dev->event) dev->event(dev, type, code, value);
171	break;
172	}
173
174	if (type != EV_SYN)
175	dev->sync = 0;
176
177	if (dev->grab)
178	dev->grab->handler->event(dev->grab, type, code, value);
179	else
180	list_for_each_entry(handle, &dev->h_list, d_node)
181	if (handle->open)
182	handle->handler->event(handle, type, code, value);
183	}
184
185	static void input_repeat_key(unsigned long data)
186	{
187	struct input_dev dev = (void ) data;
188
189	if (!test_bit(dev->repeat_key, dev->key))
190	return;
191
192	input_event(dev, EV_KEY, dev->repeat_key, 2);
193	input_sync(dev);
194
195	if (dev->rep[REP_PERIOD])
196	mod_timer(&dev->timer, jiffies + msecs_to_jiffies(dev->rep[REP_PERIOD]));
197	}
198
199	int input_accept_process(struct input_handle handle, struct file file)
200	{
201	if (handle->dev->accept)
202	return handle->dev->accept(handle->dev, file);
203
204	return 0;
205	}
206
207	int input_grab_device(struct input_handle *handle)
208	{
209	if (handle->dev->grab)
210	return -EBUSY;
211
212	handle->dev->grab = handle;
213	return 0;
214	}
215
216	void input_release_device(struct input_handle *handle)
217	{
218	if (handle->dev->grab == handle)
219	handle->dev->grab = NULL;
220	}
221
222	int input_open_device(struct input_handle *handle)
223	{
0fbf87ca DT	224	struct input_dev *dev = handle->dev;
	225	int err;
	226
	227	err = down_interruptible(&dev->sem);
	228	if (err)
	229	return err;
	230
1da177e4	231	handle->open++;
0fbf87ca DT	232
	233	if (!dev->users++ && dev->open)
	234	err = dev->open(dev);
	235
	236	if (err)
	237	handle->open--;
	238
	239	up(&dev->sem);
	240
	241	return err;
1da177e4 LT	242	}
	243
	244	int input_flush_device(struct input_handle* handle, struct file* file)
	245	{
	246	if (handle->dev->flush)
	247	return handle->dev->flush(handle->dev, file);
	248
	249	return 0;
	250	}
	251
	252	void input_close_device(struct input_handle *handle)
	253	{
0fbf87ca DT	254	struct input_dev *dev = handle->dev;
0fbf87ca DT	255
1da177e4	256	input_release_device(handle);
0fbf87ca DT	257
	258	down(&dev->sem);
	259
	260	if (!--dev->users && dev->close)
	261	dev->close(dev);
1da177e4	262	handle->open--;
0fbf87ca DT	263
0fbf87ca DT	264	up(&dev->sem);
1da177e4 LT	265	}
	266
	267	static void input_link_handle(struct input_handle *handle)
	268	{
	269	list_add_tail(&handle->d_node, &handle->dev->h_list);
	270	list_add_tail(&handle->h_node, &handle->handler->h_list);
	271	}
	272
	273	#define MATCH_BIT(bit, max) \
	274	for (i = 0; i < NBITS(max); i++) \
	275	if ((id->bit[i] & dev->bit[i]) != id->bit[i]) \
	276	break; \
	277	if (i != NBITS(max)) \
	278	continue;
	279
	280	static struct input_device_id input_match_device(struct input_device_id id, struct input_dev *dev)
	281	{
	282	int i;
	283
	284	for (; id->flags \|\| id->driver_info; id++) {
	285
	286	if (id->flags & INPUT_DEVICE_ID_MATCH_BUS)
	287	if (id->id.bustype != dev->id.bustype)
	288	continue;
	289
	290	if (id->flags & INPUT_DEVICE_ID_MATCH_VENDOR)
	291	if (id->id.vendor != dev->id.vendor)
	292	continue;
	293
	294	if (id->flags & INPUT_DEVICE_ID_MATCH_PRODUCT)
	295	if (id->id.product != dev->id.product)
	296	continue;
	297
	298	if (id->flags & INPUT_DEVICE_ID_MATCH_VERSION)
	299	if (id->id.version != dev->id.version)
	300	continue;
	301
	302	MATCH_BIT(evbit, EV_MAX);
	303	MATCH_BIT(keybit, KEY_MAX);
	304	MATCH_BIT(relbit, REL_MAX);
	305	MATCH_BIT(absbit, ABS_MAX);
	306	MATCH_BIT(mscbit, MSC_MAX);
	307	MATCH_BIT(ledbit, LED_MAX);
	308	MATCH_BIT(sndbit, SND_MAX);
	309	MATCH_BIT(ffbit, FF_MAX);
ff13f98b	310	MATCH_BIT(swbit, SW_MAX);
1da177e4 LT	311
	312	return id;
	313	}
	314
	315	return NULL;
	316	}
	317
f96b434d	318
1da177e4 LT	319	/*
	320	* Input hotplugging interface - loading event handlers based on
	321	* device bitfields.
	322	*/
	323
	324	#ifdef CONFIG_HOTPLUG
	325
	326	/*
	327	* Input hotplugging invokes what /proc/sys/kernel/hotplug says
	328	* (normally /sbin/hotplug) when input devices get added or removed.
	329	*
	330	* This invokes a user mode policy agent, typically helping to load driver
	331	* or other modules, configure the device, and more. Drivers can provide
	332	* a MODULE_DEVICE_TABLE to help with module loading subtasks.
	333	*
	334	*/
	335
	336	#define SPRINTF_BIT_A(bit, name, max) \
	337	do { \
	338	envp[i++] = scratch; \
	339	scratch += sprintf(scratch, name); \
	340	for (j = NBITS(max) - 1; j >= 0; j--) \
	341	if (dev->bit[j]) break; \
	342	for (; j >= 0; j--) \
	343	scratch += sprintf(scratch, "%lx ", dev->bit[j]); \
	344	scratch++; \
	345	} while (0)
	346
	347	#define SPRINTF_BIT_A2(bit, name, max, ev) \
	348	do { \
	349	if (test_bit(ev, dev->evbit)) \
	350	SPRINTF_BIT_A(bit, name, max); \
	351	} while (0)
	352
	353	static void input_call_hotplug(char verb, struct input_dev dev)
	354	{
	355	char argv[3], envp, buf, *scratch;
	356	int i = 0, j, value;
	357
	358	if (!hotplug_path[0]) {
	359	printk(KERN_ERR "input.c: calling hotplug without a hotplug agent defined\n");
	360	return;
	361	}
	362	if (in_interrupt()) {
	363	printk(KERN_ERR "input.c: calling hotplug from interrupt\n");
	364	return;
	365	}
	366	if (!current->fs->root) {
	367	printk(KERN_WARNING "input.c: calling hotplug without valid filesystem\n");
	368	return;
	369	}
	370	if (!(envp = (char *) kmalloc(20 sizeof(char *), GFP_KERNEL))) {
	371	printk(KERN_ERR "input.c: not enough memory allocating hotplug environment\n");
	372	return;
	373	}
	374	if (!(buf = kmalloc(1024, GFP_KERNEL))) {
	375	kfree (envp);
	376	printk(KERN_ERR "input.c: not enough memory allocating hotplug environment\n");
	377	return;
	378	}
	379
	380	argv[0] = hotplug_path;
	381	argv[1] = "input";
	382	argv[2] = NULL;
383
384	envp[i++] = "HOME=/";
385	envp[i++] = "PATH=/sbin:/bin:/usr/sbin:/usr/bin";
386
387	scratch = buf;
388
389	envp[i++] = scratch;
390	scratch += sprintf(scratch, "ACTION=%s", verb) + 1;
391
392	envp[i++] = scratch;
393	scratch += sprintf(scratch, "PRODUCT=%x/%x/%x/%x",
394	dev->id.bustype, dev->id.vendor, dev->id.product, dev->id.version) + 1;
395
396	if (dev->name) {
397	envp[i++] = scratch;
398	scratch += sprintf(scratch, "NAME=%s", dev->name) + 1;
399	}
400
401	if (dev->phys) {
402	envp[i++] = scratch;
403	scratch += sprintf(scratch, "PHYS=%s", dev->phys) + 1;
404	}
405
406	SPRINTF_BIT_A(evbit, "EV=", EV_MAX);
407	SPRINTF_BIT_A2(keybit, "KEY=", KEY_MAX, EV_KEY);
408	SPRINTF_BIT_A2(relbit, "REL=", REL_MAX, EV_REL);
409	SPRINTF_BIT_A2(absbit, "ABS=", ABS_MAX, EV_ABS);
410	SPRINTF_BIT_A2(mscbit, "MSC=", MSC_MAX, EV_MSC);
411	SPRINTF_BIT_A2(ledbit, "LED=", LED_MAX, EV_LED);
412	SPRINTF_BIT_A2(sndbit, "SND=", SND_MAX, EV_SND);
413	SPRINTF_BIT_A2(ffbit, "FF=", FF_MAX, EV_FF);
31581066	414	SPRINTF_BIT_A2(swbit, "SW=", SW_MAX, EV_SW);
1da177e4 LT	415
	416	envp[i++] = NULL;
	417
	418	#ifdef INPUT_DEBUG
	419	printk(KERN_DEBUG "input.c: calling %s %s [%s %s %s %s %s]\n",
	420	argv[0], argv[1], envp[0], envp[1], envp[2], envp[3], envp[4]);
	421	#endif
	422
	423	value = call_usermodehelper(argv [0], argv, envp, 0);
	424
	425	kfree(buf);
	426	kfree(envp);
	427
	428	#ifdef INPUT_DEBUG
	429	if (value != 0)
	430	printk(KERN_DEBUG "input.c: hotplug returned %d\n", value);
	431	#endif
	432	}
	433
	434	#endif
	435
f96b434d DT	436	#ifdef CONFIG_PROC_FS
	437
	438	static struct proc_dir_entry *proc_bus_input_dir;
	439	static DECLARE_WAIT_QUEUE_HEAD(input_devices_poll_wait);
	440	static int input_devices_state;
	441
	442	static inline void input_wakeup_procfs_readers(void)
	443	{
	444	input_devices_state++;
	445	wake_up(&input_devices_poll_wait);
	446	}
	447
	448	static unsigned int input_devices_poll(struct file file, poll_table wait)
	449	{
	450	int state = input_devices_state;
	451	poll_wait(file, &input_devices_poll_wait, wait);
	452	if (state != input_devices_state)
	453	return POLLIN \| POLLRDNORM;
	454	return 0;
	455	}
	456
	457	#define SPRINTF_BIT_B(bit, name, max) \
	458	do { \
	459	len += sprintf(buf + len, "B: %s", name); \
	460	for (i = NBITS(max) - 1; i >= 0; i--) \
	461	if (dev->bit[i]) break; \
	462	for (; i >= 0; i--) \
	463	len += sprintf(buf + len, "%lx ", dev->bit[i]); \
	464	len += sprintf(buf + len, "\n"); \
	465	} while (0)
	466
	467	#define SPRINTF_BIT_B2(bit, name, max, ev) \
	468	do { \
	469	if (test_bit(ev, dev->evbit)) \
	470	SPRINTF_BIT_B(bit, name, max); \
	471	} while (0)
	472
	473	static int input_devices_read(char buf, char start, off_t pos, int count, int eof, void *data)
	474	{
	475	struct input_dev *dev;
	476	struct input_handle *handle;
	477
	478	off_t at = 0;
	479	int i, len, cnt = 0;
	480
	481	list_for_each_entry(dev, &input_dev_list, node) {
	482
	483	len = sprintf(buf, "I: Bus=%04x Vendor=%04x Product=%04x Version=%04x\n",
	484	dev->id.bustype, dev->id.vendor, dev->id.product, dev->id.version);
	485
	486	len += sprintf(buf + len, "N: Name=\"%s\"\n", dev->name ? dev->name : "");
	487	len += sprintf(buf + len, "P: Phys=%s\n", dev->phys ? dev->phys : "");
	488	len += sprintf(buf + len, "H: Handlers=");
	489
	490	list_for_each_entry(handle, &dev->h_list, d_node)
	491	len += sprintf(buf + len, "%s ", handle->name);
	492
	493	len += sprintf(buf + len, "\n");
	494
	495	SPRINTF_BIT_B(evbit, "EV=", EV_MAX);
	496	SPRINTF_BIT_B2(keybit, "KEY=", KEY_MAX, EV_KEY);
	497	SPRINTF_BIT_B2(relbit, "REL=", REL_MAX, EV_REL);
	498	SPRINTF_BIT_B2(absbit, "ABS=", ABS_MAX, EV_ABS);
	499	SPRINTF_BIT_B2(mscbit, "MSC=", MSC_MAX, EV_MSC);
500	SPRINTF_BIT_B2(ledbit, "LED=", LED_MAX, EV_LED);
501	SPRINTF_BIT_B2(sndbit, "SND=", SND_MAX, EV_SND);
502	SPRINTF_BIT_B2(ffbit, "FF=", FF_MAX, EV_FF);
31581066	503	SPRINTF_BIT_B2(swbit, "SW=", SW_MAX, EV_SW);
f96b434d DT	504
	505	len += sprintf(buf + len, "\n");
	506
	507	at += len;
	508
	509	if (at >= pos) {
	510	if (!*start) {
	511	*start = buf + (pos - (at - len));
	512	cnt = at - pos;
	513	} else cnt += len;
	514	buf += len;
	515	if (cnt >= count)
	516	break;
	517	}
	518	}
	519
	520	if (&dev->node == &input_dev_list)
	521	*eof = 1;
	522
	523	return (count > cnt) ? cnt : count;
	524	}
	525
	526	static int input_handlers_read(char buf, char start, off_t pos, int count, int eof, void *data)
	527	{
	528	struct input_handler *handler;
	529
	530	off_t at = 0;
	531	int len = 0, cnt = 0;
	532	int i = 0;
	533
	534	list_for_each_entry(handler, &input_handler_list, node) {
	535
	536	if (handler->fops)
	537	len = sprintf(buf, "N: Number=%d Name=%s Minor=%d\n",
	538	i++, handler->name, handler->minor);
	539	else
	540	len = sprintf(buf, "N: Number=%d Name=%s\n",
	541	i++, handler->name);
	542
	543	at += len;
	544
	545	if (at >= pos) {
	546	if (!*start) {
	547	*start = buf + (pos - (at - len));
	548	cnt = at - pos;
	549	} else cnt += len;
	550	buf += len;
	551	if (cnt >= count)
	552	break;
	553	}
	554	}
	555	if (&handler->node == &input_handler_list)
	556	*eof = 1;
	557
	558	return (count > cnt) ? cnt : count;
	559	}
	560
	561	static struct file_operations input_fileops;
	562
	563	static int __init input_proc_init(void)
	564	{
	565	struct proc_dir_entry *entry;
	566
	567	proc_bus_input_dir = proc_mkdir("input", proc_bus);
568	if (!proc_bus_input_dir)
569	return -ENOMEM;
570
571	proc_bus_input_dir->owner = THIS_MODULE;
572
573	entry = create_proc_read_entry("devices", 0, proc_bus_input_dir, input_devices_read, NULL);
574	if (!entry)
575	goto fail1;
576
577	entry->owner = THIS_MODULE;
578	input_fileops = *entry->proc_fops;
579	entry->proc_fops = &input_fileops;
580	entry->proc_fops->poll = input_devices_poll;
581
582	entry = create_proc_read_entry("handlers", 0, proc_bus_input_dir, input_handlers_read, NULL);
583	if (!entry)
584	goto fail2;
585
586	entry->owner = THIS_MODULE;
587
588	return 0;
589
590	fail2: remove_proc_entry("devices", proc_bus_input_dir);
591	fail1: remove_proc_entry("input", proc_bus);
592	return -ENOMEM;
593	}
594
beffbdc2	595	static void input_proc_exit(void)
f96b434d DT	596	{
	597	remove_proc_entry("devices", proc_bus_input_dir);
	598	remove_proc_entry("handlers", proc_bus_input_dir);
	599	remove_proc_entry("input", proc_bus);
	600	}
	601
	602	#else /* !CONFIG_PROC_FS */
	603	static inline void input_wakeup_procfs_readers(void) { }
	604	static inline int input_proc_init(void) { return 0; }
	605	static inline void input_proc_exit(void) { }
	606	#endif
	607
1da177e4 LT	608	void input_register_device(struct input_dev *dev)
	609	{
	610	struct input_handle *handle;
	611	struct input_handler *handler;
	612	struct input_device_id *id;
	613
	614	set_bit(EV_SYN, dev->evbit);
	615
0fbf87ca DT	616	init_MUTEX(&dev->sem);
0fbf87ca DT	617
1da177e4 LT	618	/*
	619	* If delay and period are pre-set by the driver, then autorepeating
	620	* is handled by the driver itself and we don't do it in input.c.
	621	*/
	622
	623	init_timer(&dev->timer);
	624	if (!dev->rep[REP_DELAY] && !dev->rep[REP_PERIOD]) {
	625	dev->timer.data = (long) dev;
	626	dev->timer.function = input_repeat_key;
	627	dev->rep[REP_DELAY] = 250;
	628	dev->rep[REP_PERIOD] = 33;
	629	}
	630
	631	INIT_LIST_HEAD(&dev->h_list);
	632	list_add_tail(&dev->node, &input_dev_list);
	633
	634	list_for_each_entry(handler, &input_handler_list, node)
	635	if (!handler->blacklist \|\| !input_match_device(handler->blacklist, dev))
	636	if ((id = input_match_device(handler->id_table, dev)))
	637	if ((handle = handler->connect(handler, dev, id)))
	638	input_link_handle(handle);
	639
	640	#ifdef CONFIG_HOTPLUG
	641	input_call_hotplug("add", dev);
	642	#endif
	643
f96b434d	644	input_wakeup_procfs_readers();
1da177e4 LT	645	}
	646
	647	void input_unregister_device(struct input_dev *dev)
	648	{
	649	struct list_head * node, * next;
	650
	651	if (!dev) return;
	652
	653	del_timer_sync(&dev->timer);
	654
	655	list_for_each_safe(node, next, &dev->h_list) {
	656	struct input_handle * handle = to_handle(node);
	657	list_del_init(&handle->d_node);
	658	list_del_init(&handle->h_node);
	659	handle->handler->disconnect(handle);
	660	}
	661
	662	#ifdef CONFIG_HOTPLUG
	663	input_call_hotplug("remove", dev);
	664	#endif
	665
	666	list_del_init(&dev->node);
	667
f96b434d	668	input_wakeup_procfs_readers();
1da177e4 LT	669	}
	670
	671	void input_register_handler(struct input_handler *handler)
	672	{
	673	struct input_dev *dev;
	674	struct input_handle *handle;
	675	struct input_device_id *id;
	676
	677	if (!handler) return;
	678
	679	INIT_LIST_HEAD(&handler->h_list);
	680
	681	if (handler->fops != NULL)
	682	input_table[handler->minor >> 5] = handler;
	683
	684	list_add_tail(&handler->node, &input_handler_list);
	685
	686	list_for_each_entry(dev, &input_dev_list, node)
	687	if (!handler->blacklist \|\| !input_match_device(handler->blacklist, dev))
	688	if ((id = input_match_device(handler->id_table, dev)))
	689	if ((handle = handler->connect(handler, dev, id)))
	690	input_link_handle(handle);
	691
f96b434d	692	input_wakeup_procfs_readers();
1da177e4 LT	693	}
	694
	695	void input_unregister_handler(struct input_handler *handler)
	696	{
	697	struct list_head * node, * next;
	698
	699	list_for_each_safe(node, next, &handler->h_list) {
	700	struct input_handle * handle = to_handle_h(node);
	701	list_del_init(&handle->h_node);
	702	list_del_init(&handle->d_node);
	703	handler->disconnect(handle);
	704	}
	705
	706	list_del_init(&handler->node);
	707
	708	if (handler->fops != NULL)
	709	input_table[handler->minor >> 5] = NULL;
	710
f96b434d	711	input_wakeup_procfs_readers();
1da177e4 LT	712	}
	713
	714	static int input_open_file(struct inode inode, struct file file)
	715	{
	716	struct input_handler *handler = input_table[iminor(inode) >> 5];
	717	struct file_operations old_fops, new_fops = NULL;
	718	int err;
	719
	720	/* No load-on-demand here? */
	721	if (!handler \|\| !(new_fops = fops_get(handler->fops)))
	722	return -ENODEV;
	723
	724	/*
	725	* That's _really_ odd. Usually NULL ->open means "nothing special",
	726	* not "no device". Oh, well...
	727	*/
	728	if (!new_fops->open) {
	729	fops_put(new_fops);
	730	return -ENODEV;
	731	}
	732	old_fops = file->f_op;
	733	file->f_op = new_fops;
	734
	735	err = new_fops->open(inode, file);
	736
	737	if (err) {
	738	fops_put(file->f_op);
	739	file->f_op = fops_get(old_fops);
	740	}
	741	fops_put(old_fops);
	742	return err;
	743	}
	744
	745	static struct file_operations input_fops = {
	746	.owner = THIS_MODULE,
	747	.open = input_open_file,
	748	};
	749
f96b434d	750	struct class *input_class;
1da177e4	751
f96b434d	752	static int __init input_init(void)
1da177e4	753	{
f96b434d	754	int err;
1da177e4	755
f96b434d DT	756	input_class = class_create(THIS_MODULE, "input");
	757	if (IS_ERR(input_class)) {
	758	printk(KERN_ERR "input: unable to register input class\n");
	759	return PTR_ERR(input_class);
1da177e4 LT	760	}
1da177e4 LT	761
f96b434d DT	762	err = input_proc_init();
	763	if (err)
	764	goto fail1;
1da177e4	765
f96b434d DT	766	err = register_chrdev(INPUT_MAJOR, "input", &input_fops);
	767	if (err) {
	768	printk(KERN_ERR "input: unable to register char major %d", INPUT_MAJOR);
	769	goto fail2;
1da177e4	770	}
e334016f	771
1da177e4	772	return 0;
1da177e4	773
f96b434d DT	774	fail2: input_proc_exit();
	775	fail1: class_destroy(input_class);
	776	return err;
1da177e4 LT	777	}
	778
	779	static void __exit input_exit(void)
	780	{
f96b434d	781	input_proc_exit();
1da177e4	782	unregister_chrdev(INPUT_MAJOR, "input");
1235686f	783	class_destroy(input_class);
1da177e4 LT	784	}
	785
	786	subsys_initcall(input_init);
	787	module_exit(input_exit);