/* * 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>#include <linux/devfs_fs_kernel.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);

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