[deliverable/linux.git] / drivers / hid / hidraw.c

/*
 * HID raw devices, giving access to raw HID events.
 *
 * In comparison to hiddev, this device does not process the
 * hid events at all (no parsing, no lookups). This lets applications
 * to work on raw hid events as they want to, and avoids a need to
 * use a transport-specific userspace libhid/libusb libraries.
 *
 *  Copyright (c) 2007 Jiri Kosina
 */

/*
 * This program is free software; you can redistribute it and/or modify it
 * under the terms and conditions of the GNU General Public License,
 * version 2, as published by the Free Software Foundation.
 *
 * You should have received a copy of the GNU General Public License along with
 * this program; if not, write to the Free Software Foundation, Inc.,
 * 51 Franklin St - Fifth Floor, Boston, MA 02110-1301 USA.
 */

#include <linux/fs.h>
#include <linux/module.h>
#include <linux/errno.h>
#include <linux/kernel.h>
#include <linux/init.h>
#include <linux/cdev.h>
#include <linux/poll.h>
#include <linux/device.h>
#include <linux/major.h>
#include <linux/slab.h>
#include <linux/hid.h>
#include <linux/mutex.h>
#include <linux/sched.h>
#include <linux/smp_lock.h>

#include <linux/hidraw.h>

static int hidraw_major;
static struct cdev hidraw_cdev;
static struct class *hidraw_class;
static struct hidraw *hidraw_table[HIDRAW_MAX_DEVICES];
static DEFINE_MUTEX(minors_lock);

static ssize_t hidraw_read(struct file *file, char __user *buffer, size_t count, loff_t *ppos)
{
	struct hidraw_list *list = file->private_data;
	int ret = 0, len;
	char *report;
	DECLARE_WAITQUEUE(wait, current);

	mutex_lock(&list->read_mutex);

	while (ret == 0) {
		if (list->head == list->tail) {
			add_wait_queue(&list->hidraw->wait, &wait);
			set_current_state(TASK_INTERRUPTIBLE);

			while (list->head == list->tail) {
				if (file->f_flags & O_NONBLOCK) {
					ret = -EAGAIN;
					break;
				}
				if (signal_pending(current)) {
					ret = -ERESTARTSYS;
					break;
				}
				if (!list->hidraw->exist) {
					ret = -EIO;
					break;
				}

				/* allow O_NONBLOCK to work well from other threads */
				mutex_unlock(&list->read_mutex);
				schedule();
				mutex_lock(&list->read_mutex);
				set_current_state(TASK_INTERRUPTIBLE);
			}

			set_current_state(TASK_RUNNING);
			remove_wait_queue(&list->hidraw->wait, &wait);
		}

		if (ret)
			goto out;

		report = list->buffer[list->tail].value;
		len = list->buffer[list->tail].len > count ?
			count : list->buffer[list->tail].len;

		if (copy_to_user(buffer, list->buffer[list->tail].value, len)) {
			ret = -EFAULT;
			goto out;
		}
		ret += len;

		kfree(list->buffer[list->tail].value);
		list->tail = (list->tail + 1) & (HIDRAW_BUFFER_SIZE - 1);
	}
out:
	mutex_unlock(&list->read_mutex);
	return ret;
}

/* the first byte is expected to be a report number */
static ssize_t hidraw_write(struct file *file, const char __user *buffer, size_t count, loff_t *ppos)
{
	unsigned int minor = iminor(file->f_path.dentry->d_inode);
	struct hid_device *dev;
	__u8 *buf;
	int ret = 0;

	mutex_lock(&minors_lock);
	dev = hidraw_table[minor]->hid;

	if (!dev->hid_output_raw_report) {
		ret = -ENODEV;
		goto out;
	}

	if (count > HID_MAX_BUFFER_SIZE) {
		printk(KERN_WARNING "hidraw: pid %d passed too large report\n",
				task_pid_nr(current));
		ret = -EINVAL;
		goto out;
	}

	if (count < 2) {
		printk(KERN_WARNING "hidraw: pid %d passed too short report\n",
				task_pid_nr(current));
		ret = -EINVAL;
		goto out;
	}

	buf = kmalloc(count * sizeof(__u8), GFP_KERNEL);
	if (!buf) {
		ret = -ENOMEM;
		goto out;
	}

	if (copy_from_user(buf, buffer, count)) {
		ret = -EFAULT;
		goto out_free;
	}

	ret = dev->hid_output_raw_report(dev, buf, count, HID_OUTPUT_REPORT);
out_free:
	kfree(buf);
out:
	mutex_unlock(&minors_lock);
	return ret;
}

static unsigned int hidraw_poll(struct file *file, poll_table *wait)
{
	struct hidraw_list *list = file->private_data;

	poll_wait(file, &list->hidraw->wait, wait);
	if (list->head != list->tail)
		return POLLIN | POLLRDNORM;
	if (!list->hidraw->exist)
		return POLLERR | POLLHUP;
	return 0;
}

static int hidraw_open(struct inode *inode, struct file *file)
{
	unsigned int minor = iminor(inode);
	struct hidraw *dev;
	struct hidraw_list *list;
	int err = 0;

	if (!(list = kzalloc(sizeof(struct hidraw_list), GFP_KERNEL))) {
		err = -ENOMEM;
		goto out;
	}

	mutex_lock(&minors_lock);
	if (!hidraw_table[minor]) {
		kfree(list);
		err = -ENODEV;
		goto out_unlock;
	}

	list->hidraw = hidraw_table[minor];
	mutex_init(&list->read_mutex);
	list_add_tail(&list->node, &hidraw_table[minor]->list);
	file->private_data = list;

	dev = hidraw_table[minor];
	if (!dev->open++) {
		if (dev->hid->ll_driver->power) {
			err = dev->hid->ll_driver->power(dev->hid, PM_HINT_FULLON);
			if (err < 0)
				goto out_unlock;
		}
		err = dev->hid->ll_driver->open(dev->hid);
		if (err < 0) {
			if (dev->hid->ll_driver->power)
				dev->hid->ll_driver->power(dev->hid, PM_HINT_NORMAL);
			dev->open--;
		}
	}

out_unlock:
	mutex_unlock(&minors_lock);
out:
	return err;

}

static int hidraw_release(struct inode * inode, struct file * file)
{
	unsigned int minor = iminor(inode);
	struct hidraw *dev;
	struct hidraw_list *list = file->private_data;

	if (!hidraw_table[minor])
		return -ENODEV;

	list_del(&list->node);
	dev = hidraw_table[minor];
	if (!--dev->open) {
		if (list->hidraw->exist) {
			if (dev->hid->ll_driver->power)
				dev->hid->ll_driver->power(dev->hid, PM_HINT_NORMAL);
			dev->hid->ll_driver->close(dev->hid);
		} else {
			kfree(list->hidraw);
		}
	}

	kfree(list);

	return 0;
}

static long hidraw_ioctl(struct file *file, unsigned int cmd,
							unsigned long arg)
{
	struct inode *inode = file->f_path.dentry->d_inode;
	unsigned int minor = iminor(inode);
	long ret = 0;
	struct hidraw *dev;
	void __user *user_arg = (void __user*) arg;

	mutex_lock(&minors_lock);
	dev = hidraw_table[minor];

	switch (cmd) {
		case HIDIOCGRDESCSIZE:
			if (put_user(dev->hid->rsize, (int __user *)arg))
				ret = -EFAULT;
			break;

		case HIDIOCGRDESC:
			{
				__u32 len;

				if (get_user(len, (int __user *)arg))
					ret = -EFAULT;
				else if (len > HID_MAX_DESCRIPTOR_SIZE - 1)
					ret = -EINVAL;
				else if (copy_to_user(user_arg + offsetof(
					struct hidraw_report_descriptor,
					value[0]),
					dev->hid->rdesc,
					min(dev->hid->rsize, len)))
					ret = -EFAULT;
				break;
			}
		case HIDIOCGRAWINFO:
			{
				struct hidraw_devinfo dinfo;

				dinfo.bustype = dev->hid->bus;
				dinfo.vendor = dev->hid->vendor;
				dinfo.product = dev->hid->product;
				if (copy_to_user(user_arg, &dinfo, sizeof(dinfo)))
					ret = -EFAULT;
				break;
			}
		default:
			{
				struct hid_device *hid = dev->hid;
				if (_IOC_TYPE(cmd) != 'H' || _IOC_DIR(cmd) != _IOC_READ) {
					ret = -EINVAL;
					break;
				}

				if (_IOC_NR(cmd) == _IOC_NR(HIDIOCGRAWNAME(0))) {
					int len;
					if (!hid->name) {
						ret = 0;
						break;
					}
					len = strlen(hid->name) + 1;
					if (len > _IOC_SIZE(cmd))
						len = _IOC_SIZE(cmd);
					ret = copy_to_user(user_arg, hid->name, len) ?
						-EFAULT : len;
					break;
				}

				if (_IOC_NR(cmd) == _IOC_NR(HIDIOCGRAWPHYS(0))) {
					int len;
					if (!hid->phys) {
						ret = 0;
						break;
					}
					len = strlen(hid->phys) + 1;
					if (len > _IOC_SIZE(cmd))
						len = _IOC_SIZE(cmd);
					ret = copy_to_user(user_arg, hid->phys, len) ?
						-EFAULT : len;
					break;
				}
		}

		ret = -ENOTTY;
	}
	mutex_unlock(&minors_lock);
	return ret;
}

static const struct file_operations hidraw_ops = {
	.owner =        THIS_MODULE,
	.read =         hidraw_read,
	.write =        hidraw_write,
	.poll =         hidraw_poll,
	.open =         hidraw_open,
	.release =      hidraw_release,
	.unlocked_ioctl = hidraw_ioctl,
};

void hidraw_report_event(struct hid_device *hid, u8 *data, int len)
{
	struct hidraw *dev = hid->hidraw;
	struct hidraw_list *list;

	list_for_each_entry(list, &dev->list, node) {
		list->buffer[list->head].value = kmemdup(data, len, GFP_ATOMIC);
		list->buffer[list->head].len = len;
		list->head = (list->head + 1) & (HIDRAW_BUFFER_SIZE - 1);
		kill_fasync(&list->fasync, SIGIO, POLL_IN);
	}

	wake_up_interruptible(&dev->wait);
}
EXPORT_SYMBOL_GPL(hidraw_report_event);

int hidraw_connect(struct hid_device *hid)
{
	int minor, result;
	struct hidraw *dev;

	/* we accept any HID device, no matter the applications */

	dev = kzalloc(sizeof(struct hidraw), GFP_KERNEL);
	if (!dev)
		return -ENOMEM;

	result = -EINVAL;

	mutex_lock(&minors_lock);

	for (minor = 0; minor < HIDRAW_MAX_DEVICES; minor++) {
		if (hidraw_table[minor])
			continue;
		hidraw_table[minor] = dev;
		result = 0;
		break;
	}

	if (result) {
		mutex_unlock(&minors_lock);
		kfree(dev);
		goto out;
	}

	dev->dev = device_create(hidraw_class, &hid->dev, MKDEV(hidraw_major, minor),
				 NULL, "%s%d", "hidraw", minor);

	if (IS_ERR(dev->dev)) {
		hidraw_table[minor] = NULL;
		mutex_unlock(&minors_lock);
		result = PTR_ERR(dev->dev);
		kfree(dev);
		goto out;
	}

	mutex_unlock(&minors_lock);
	init_waitqueue_head(&dev->wait);
	INIT_LIST_HEAD(&dev->list);

	dev->hid = hid;
	dev->minor = minor;

	dev->exist = 1;
	hid->hidraw = dev;

out:
	return result;

}
EXPORT_SYMBOL_GPL(hidraw_connect);

void hidraw_disconnect(struct hid_device *hid)
{
	struct hidraw *hidraw = hid->hidraw;

	hidraw->exist = 0;

	mutex_lock(&minors_lock);
	hidraw_table[hidraw->minor] = NULL;
	mutex_unlock(&minors_lock);

	device_destroy(hidraw_class, MKDEV(hidraw_major, hidraw->minor));

	if (hidraw->open) {
		hid->ll_driver->close(hid);
		wake_up_interruptible(&hidraw->wait);
	} else {
		kfree(hidraw);
	}
}
EXPORT_SYMBOL_GPL(hidraw_disconnect);

int __init hidraw_init(void)
{
	int result;
	dev_t dev_id;

	result = alloc_chrdev_region(&dev_id, HIDRAW_FIRST_MINOR,
			HIDRAW_MAX_DEVICES, "hidraw");

	hidraw_major = MAJOR(dev_id);

	if (result < 0) {
		printk(KERN_WARNING "hidraw: can't get major number\n");
		result = 0;
		goto out;
	}

	hidraw_class = class_create(THIS_MODULE, "hidraw");
	if (IS_ERR(hidraw_class)) {
		result = PTR_ERR(hidraw_class);
		unregister_chrdev(hidraw_major, "hidraw");
		goto out;
	}

        cdev_init(&hidraw_cdev, &hidraw_ops);
        cdev_add(&hidraw_cdev, dev_id, HIDRAW_MAX_DEVICES);
out:
	return result;
}

void hidraw_exit(void)
{
	dev_t dev_id = MKDEV(hidraw_major, 0);

	cdev_del(&hidraw_cdev);
	class_destroy(hidraw_class);
	unregister_chrdev_region(dev_id, HIDRAW_MAX_DEVICES);

}
Commit	Line	Data
86166b7b JK	1	/*
	2	* HID raw devices, giving access to raw HID events.
	3	*
	4	* In comparison to hiddev, this device does not process the
	5	* hid events at all (no parsing, no lookups). This lets applications
	6	* to work on raw hid events as they want to, and avoids a need to
	7	* use a transport-specific userspace libhid/libusb libraries.
	8	*
	9	* Copyright (c) 2007 Jiri Kosina
	10	*/
	11
	12	/*
	13	* This program is free software; you can redistribute it and/or modify it
	14	* under the terms and conditions of the GNU General Public License,
	15	* version 2, as published by the Free Software Foundation.
	16	*
	17	* You should have received a copy of the GNU General Public License along with
	18	* this program; if not, write to the Free Software Foundation, Inc.,
	19	* 51 Franklin St - Fifth Floor, Boston, MA 02110-1301 USA.
	20	*/
	21
	22	#include <linux/fs.h>
	23	#include <linux/module.h>
	24	#include <linux/errno.h>
	25	#include <linux/kernel.h>
	26	#include <linux/init.h>
	27	#include <linux/cdev.h>
	28	#include <linux/poll.h>
	29	#include <linux/device.h>
	30	#include <linux/major.h>
5a0e3ad6	31	#include <linux/slab.h>
86166b7b JK	32	#include <linux/hid.h>
86166b7b JK	33	#include <linux/mutex.h>
a99bbaf5	34	#include <linux/sched.h>
702e57d9	35	#include <linux/smp_lock.h>
86166b7b JK	36
	37	#include <linux/hidraw.h>
	38
	39	static int hidraw_major;
	40	static struct cdev hidraw_cdev;
	41	static struct class *hidraw_class;
	42	static struct hidraw *hidraw_table[HIDRAW_MAX_DEVICES];
7d672cd7	43	static DEFINE_MUTEX(minors_lock);
86166b7b JK	44
	45	static ssize_t hidraw_read(struct file file, char __user buffer, size_t count, loff_t *ppos)
	46	{
	47	struct hidraw_list *list = file->private_data;
	48	int ret = 0, len;
	49	char *report;
	50	DECLARE_WAITQUEUE(wait, current);
	51
b0e14951	52	mutex_lock(&list->read_mutex);
86166b7b	53
b0e14951	54	while (ret == 0) {
86166b7b JK	55	if (list->head == list->tail) {
	56	add_wait_queue(&list->hidraw->wait, &wait);
	57	set_current_state(TASK_INTERRUPTIBLE);
	58
	59	while (list->head == list->tail) {
	60	if (file->f_flags & O_NONBLOCK) {
	61	ret = -EAGAIN;
	62	break;
	63	}
	64	if (signal_pending(current)) {
	65	ret = -ERESTARTSYS;
	66	break;
	67	}
	68	if (!list->hidraw->exist) {
	69	ret = -EIO;
	70	break;
	71	}
	72
	73	/* allow O_NONBLOCK to work well from other threads */
	74	mutex_unlock(&list->read_mutex);
	75	schedule();
	76	mutex_lock(&list->read_mutex);
	77	set_current_state(TASK_INTERRUPTIBLE);
	78	}
	79
	80	set_current_state(TASK_RUNNING);
	81	remove_wait_queue(&list->hidraw->wait, &wait);
	82	}
	83
	84	if (ret)
	85	goto out;
	86
	87	report = list->buffer[list->tail].value;
	88	len = list->buffer[list->tail].len > count ?
	89	count : list->buffer[list->tail].len;
	90
	91	if (copy_to_user(buffer, list->buffer[list->tail].value, len)) {
	92	ret = -EFAULT;
	93	goto out;
	94	}
	95	ret += len;
	96
	97	kfree(list->buffer[list->tail].value);
	98	list->tail = (list->tail + 1) & (HIDRAW_BUFFER_SIZE - 1);
	99	}
	100	out:
	101	mutex_unlock(&list->read_mutex);
	102	return ret;
	103	}
	104
	105	/* the first byte is expected to be a report number */
	106	static ssize_t hidraw_write(struct file file, const char __user buffer, size_t count, loff_t *ppos)
	107	{
	108	unsigned int minor = iminor(file->f_path.dentry->d_inode);
2e57480b	109	struct hid_device *dev;
86166b7b JK	110	__u8 *buf;
	111	int ret = 0;
	112
2e57480b JK	113	mutex_lock(&minors_lock);
	114	dev = hidraw_table[minor]->hid;
	115
	116	if (!dev->hid_output_raw_report) {
	117	ret = -ENODEV;
	118	goto out;
	119	}
86166b7b	120
2b107d62	121	if (count > HID_MAX_BUFFER_SIZE) {
86166b7b	122	printk(KERN_WARNING "hidraw: pid %d passed too large report\n",
ba25f9dc	123	task_pid_nr(current));
2e57480b JK	124	ret = -EINVAL;
2e57480b JK	125	goto out;
86166b7b JK	126	}
	127
	128	if (count < 2) {
	129	printk(KERN_WARNING "hidraw: pid %d passed too short report\n",
ba25f9dc	130	task_pid_nr(current));
2e57480b JK	131	ret = -EINVAL;
2e57480b JK	132	goto out;
86166b7b JK	133	}
	134
	135	buf = kmalloc(count * sizeof(__u8), GFP_KERNEL);
2e57480b JK	136	if (!buf) {
	137	ret = -ENOMEM;
	138	goto out;
	139	}
86166b7b JK	140
	141	if (copy_from_user(buf, buffer, count)) {
	142	ret = -EFAULT;
2e57480b	143	goto out_free;
86166b7b JK	144	}
86166b7b JK	145
d4bfa033	146	ret = dev->hid_output_raw_report(dev, buf, count, HID_OUTPUT_REPORT);
2e57480b	147	out_free:
86166b7b	148	kfree(buf);
2e57480b JK	149	out:
2e57480b JK	150	mutex_unlock(&minors_lock);
86166b7b JK	151	return ret;
	152	}
	153
	154	static unsigned int hidraw_poll(struct file file, poll_table wait)
	155	{
	156	struct hidraw_list *list = file->private_data;
	157
	158	poll_wait(file, &list->hidraw->wait, wait);
	159	if (list->head != list->tail)
	160	return POLLIN \| POLLRDNORM;
	161	if (!list->hidraw->exist)
	162	return POLLERR \| POLLHUP;
	163	return 0;
	164	}
	165
	166	static int hidraw_open(struct inode inode, struct file file)
	167	{
	168	unsigned int minor = iminor(inode);
	169	struct hidraw *dev;
	170	struct hidraw_list *list;
	171	int err = 0;
	172
	173	if (!(list = kzalloc(sizeof(struct hidraw_list), GFP_KERNEL))) {
	174	err = -ENOMEM;
	175	goto out;
	176	}
	177
7d672cd7	178	mutex_lock(&minors_lock);
86166b7b	179	if (!hidraw_table[minor]) {
86166b7b JK	180	kfree(list);
	181	err = -ENODEV;
	182	goto out_unlock;
	183	}
	184
	185	list->hidraw = hidraw_table[minor];
	186	mutex_init(&list->read_mutex);
	187	list_add_tail(&list->node, &hidraw_table[minor]->list);
	188	file->private_data = list;
	189
	190	dev = hidraw_table[minor];
7d672cd7	191	if (!dev->open++) {
0361a28d ON	192	if (dev->hid->ll_driver->power) {
	193	err = dev->hid->ll_driver->power(dev->hid, PM_HINT_FULLON);
	194	if (err < 0)
	195	goto out_unlock;
	196	}
7d672cd7	197	err = dev->hid->ll_driver->open(dev->hid);
0361a28d ON	198	if (err < 0) {
	199	if (dev->hid->ll_driver->power)
	200	dev->hid->ll_driver->power(dev->hid, PM_HINT_NORMAL);
7d672cd7	201	dev->open--;
0361a28d	202	}
7d672cd7	203	}
86166b7b JK	204
86166b7b JK	205	out_unlock:
7d672cd7	206	mutex_unlock(&minors_lock);
7d672cd7	207	out:
86166b7b JK	208	return err;
	209
	210	}
	211
	212	static int hidraw_release(struct inode * inode, struct file * file)
	213	{
	214	unsigned int minor = iminor(inode);
	215	struct hidraw *dev;
	216	struct hidraw_list *list = file->private_data;
	217
0a504541	218	if (!hidraw_table[minor])
86166b7b	219	return -ENODEV;
86166b7b JK	220
	221	list_del(&list->node);
	222	dev = hidraw_table[minor];
b8a832b1	223	if (!--dev->open) {
0361a28d ON	224	if (list->hidraw->exist) {
	225	if (dev->hid->ll_driver->power)
	226	dev->hid->ll_driver->power(dev->hid, PM_HINT_NORMAL);
c500c971	227	dev->hid->ll_driver->close(dev->hid);
0361a28d	228	} else {
86166b7b	229	kfree(list->hidraw);
0361a28d	230	}
86166b7b JK	231	}
86166b7b JK	232
4db1c62c JK	233	kfree(list);
4db1c62c JK	234
86166b7b JK	235	return 0;
	236	}
	237
979c407e AC	238	static long hidraw_ioctl(struct file *file, unsigned int cmd,
979c407e AC	239	unsigned long arg)
86166b7b	240	{
979c407e	241	struct inode *inode = file->f_path.dentry->d_inode;
86166b7b	242	unsigned int minor = iminor(inode);
979c407e	243	long ret = 0;
2e57480b	244	struct hidraw *dev;
86166b7b JK	245	void __user user_arg = (void __user) arg;
86166b7b JK	246
2e57480b JK	247	mutex_lock(&minors_lock);
	248	dev = hidraw_table[minor];
	249
86166b7b JK	250	switch (cmd) {
	251	case HIDIOCGRDESCSIZE:
	252	if (put_user(dev->hid->rsize, (int __user *)arg))
979c407e AC	253	ret = -EFAULT;
979c407e AC	254	break;
86166b7b JK	255
	256	case HIDIOCGRDESC:
	257	{
	258	__u32 len;
	259
	260	if (get_user(len, (int __user *)arg))
979c407e AC	261	ret = -EFAULT;
	262	else if (len > HID_MAX_DESCRIPTOR_SIZE - 1)
	263	ret = -EINVAL;
	264	else if (copy_to_user(user_arg + offsetof(
	265	struct hidraw_report_descriptor,
	266	value[0]),
	267	dev->hid->rdesc,
	268	min(dev->hid->rsize, len)))
	269	ret = -EFAULT;
	270	break;
86166b7b JK	271	}
	272	case HIDIOCGRAWINFO:
	273	{
	274	struct hidraw_devinfo dinfo;
	275
	276	dinfo.bustype = dev->hid->bus;
	277	dinfo.vendor = dev->hid->vendor;
	278	dinfo.product = dev->hid->product;
	279	if (copy_to_user(user_arg, &dinfo, sizeof(dinfo)))
979c407e AC	280	ret = -EFAULT;
979c407e AC	281	break;
86166b7b JK	282	}
86166b7b JK	283	default:
9188e79e JK	284	{
9188e79e JK	285	struct hid_device *hid = dev->hid;
dfd395af DC	286	if (_IOC_TYPE(cmd) != 'H' \|\| _IOC_DIR(cmd) != _IOC_READ) {
	287	ret = -EINVAL;
	288	break;
	289	}
9188e79e JK	290
	291	if (_IOC_NR(cmd) == _IOC_NR(HIDIOCGRAWNAME(0))) {
	292	int len;
38089c65 DC	293	if (!hid->name) {
	294	ret = 0;
	295	break;
	296	}
9188e79e JK	297	len = strlen(hid->name) + 1;
	298	if (len > _IOC_SIZE(cmd))
	299	len = _IOC_SIZE(cmd);
dfd395af	300	ret = copy_to_user(user_arg, hid->name, len) ?
9188e79e	301	-EFAULT : len;
dfd395af	302	break;
9188e79e JK	303	}
	304
	305	if (_IOC_NR(cmd) == _IOC_NR(HIDIOCGRAWPHYS(0))) {
	306	int len;
38089c65 DC	307	if (!hid->phys) {
	308	ret = 0;
	309	break;
	310	}
9188e79e JK	311	len = strlen(hid->phys) + 1;
	312	if (len > _IOC_SIZE(cmd))
	313	len = _IOC_SIZE(cmd);
dfd395af	314	ret = copy_to_user(user_arg, hid->phys, len) ?
9188e79e	315	-EFAULT : len;
dfd395af	316	break;
9188e79e	317	}
81cd5843	318	}
9188e79e	319
dfd395af	320	ret = -ENOTTY;
86166b7b	321	}
2e57480b	322	mutex_unlock(&minors_lock);
979c407e	323	return ret;
86166b7b JK	324	}
	325
	326	static const struct file_operations hidraw_ops = {
	327	.owner = THIS_MODULE,
	328	.read = hidraw_read,
	329	.write = hidraw_write,
	330	.poll = hidraw_poll,
	331	.open = hidraw_open,
	332	.release = hidraw_release,
979c407e	333	.unlocked_ioctl = hidraw_ioctl,
86166b7b JK	334	};
	335
	336	void hidraw_report_event(struct hid_device hid, u8 data, int len)
	337	{
	338	struct hidraw *dev = hid->hidraw;
	339	struct hidraw_list *list;
	340
	341	list_for_each_entry(list, &dev->list, node) {
	342	list->buffer[list->head].value = kmemdup(data, len, GFP_ATOMIC);
	343	list->buffer[list->head].len = len;
	344	list->head = (list->head + 1) & (HIDRAW_BUFFER_SIZE - 1);
	345	kill_fasync(&list->fasync, SIGIO, POLL_IN);
	346	}
	347
	348	wake_up_interruptible(&dev->wait);
	349	}
	350	EXPORT_SYMBOL_GPL(hidraw_report_event);
	351
	352	int hidraw_connect(struct hid_device *hid)
	353	{
709d27c0	354	int minor, result;
86166b7b JK	355	struct hidraw *dev;
86166b7b JK	356
bbe281fa	357	/* we accept any HID device, no matter the applications */
86166b7b	358
709d27c0 MK	359	dev = kzalloc(sizeof(struct hidraw), GFP_KERNEL);
	360	if (!dev)
	361	return -ENOMEM;
	362
	363	result = -EINVAL;
86166b7b	364
7d672cd7	365	mutex_lock(&minors_lock);
86166b7b JK	366
	367	for (minor = 0; minor < HIDRAW_MAX_DEVICES; minor++) {
	368	if (hidraw_table[minor])
	369	continue;
	370	hidraw_table[minor] = dev;
	371	result = 0;
	372	break;
	373	}
	374
709d27c0	375	if (result) {
7d672cd7	376	mutex_unlock(&minors_lock);
709d27c0	377	kfree(dev);
86166b7b	378	goto out;
709d27c0	379	}
86166b7b	380
aae6c286	381	dev->dev = device_create(hidraw_class, &hid->dev, MKDEV(hidraw_major, minor),
a9b12619	382	NULL, "%s%d", "hidraw", minor);
86166b7b JK	383
86166b7b JK	384	if (IS_ERR(dev->dev)) {
86166b7b	385	hidraw_table[minor] = NULL;
7d672cd7	386	mutex_unlock(&minors_lock);
86166b7b	387	result = PTR_ERR(dev->dev);
709d27c0	388	kfree(dev);
86166b7b JK	389	goto out;
	390	}
	391
7d672cd7	392	mutex_unlock(&minors_lock);
86166b7b JK	393	init_waitqueue_head(&dev->wait);
	394	INIT_LIST_HEAD(&dev->list);
	395
	396	dev->hid = hid;
	397	dev->minor = minor;
	398
	399	dev->exist = 1;
	400	hid->hidraw = dev;
	401
	402	out:
	403	return result;
	404
	405	}
	406	EXPORT_SYMBOL_GPL(hidraw_connect);
	407
	408	void hidraw_disconnect(struct hid_device *hid)
	409	{
	410	struct hidraw *hidraw = hid->hidraw;
	411
	412	hidraw->exist = 0;
	413
7d672cd7	414	mutex_lock(&minors_lock);
86166b7b	415	hidraw_table[hidraw->minor] = NULL;
7d672cd7	416	mutex_unlock(&minors_lock);
86166b7b JK	417
	418	device_destroy(hidraw_class, MKDEV(hidraw_major, hidraw->minor));
	419
	420	if (hidraw->open) {
c500c971	421	hid->ll_driver->close(hid);
86166b7b JK	422	wake_up_interruptible(&hidraw->wait);
	423	} else {
	424	kfree(hidraw);
	425	}
	426	}
	427	EXPORT_SYMBOL_GPL(hidraw_disconnect);
	428
	429	int __init hidraw_init(void)
	430	{
	431	int result;
	432	dev_t dev_id;
	433
	434	result = alloc_chrdev_region(&dev_id, HIDRAW_FIRST_MINOR,
	435	HIDRAW_MAX_DEVICES, "hidraw");
	436
	437	hidraw_major = MAJOR(dev_id);
	438
	439	if (result < 0) {
	440	printk(KERN_WARNING "hidraw: can't get major number\n");
	441	result = 0;
	442	goto out;
	443	}
	444
	445	hidraw_class = class_create(THIS_MODULE, "hidraw");
	446	if (IS_ERR(hidraw_class)) {
	447	result = PTR_ERR(hidraw_class);
	448	unregister_chrdev(hidraw_major, "hidraw");
	449	goto out;
	450	}
	451
	452	cdev_init(&hidraw_cdev, &hidraw_ops);
	453	cdev_add(&hidraw_cdev, dev_id, HIDRAW_MAX_DEVICES);
	454	out:
	455	return result;
	456	}
	457
140ae3eb	458	void hidraw_exit(void)
86166b7b JK	459	{
	460	dev_t dev_id = MKDEV(hidraw_major, 0);
	461
	462	cdev_del(&hidraw_cdev);
	463	class_destroy(hidraw_class);
	464	unregister_chrdev_region(dev_id, HIDRAW_MAX_DEVICES);
	465
	466	}