[net-next-2.6.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;
	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;

		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,
	.llseek =	noop_llseek,
};

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;
86166b7b JK	49	DECLARE_WAITQUEUE(wait, current);
86166b7b JK	50
b0e14951	51	mutex_lock(&list->read_mutex);
86166b7b	52
b0e14951	53	while (ret == 0) {
86166b7b JK	54	if (list->head == list->tail) {
	55	add_wait_queue(&list->hidraw->wait, &wait);
	56	set_current_state(TASK_INTERRUPTIBLE);
	57
	58	while (list->head == list->tail) {
	59	if (file->f_flags & O_NONBLOCK) {
	60	ret = -EAGAIN;
	61	break;
	62	}
	63	if (signal_pending(current)) {
	64	ret = -ERESTARTSYS;
	65	break;
	66	}
	67	if (!list->hidraw->exist) {
	68	ret = -EIO;
	69	break;
	70	}
	71
	72	/* allow O_NONBLOCK to work well from other threads */
	73	mutex_unlock(&list->read_mutex);
	74	schedule();
	75	mutex_lock(&list->read_mutex);
	76	set_current_state(TASK_INTERRUPTIBLE);
	77	}
	78
	79	set_current_state(TASK_RUNNING);
	80	remove_wait_queue(&list->hidraw->wait, &wait);
	81	}
	82
	83	if (ret)
	84	goto out;
	85
86166b7b JK	86	len = list->buffer[list->tail].len > count ?
	87	count : list->buffer[list->tail].len;
	88
	89	if (copy_to_user(buffer, list->buffer[list->tail].value, len)) {
	90	ret = -EFAULT;
	91	goto out;
	92	}
	93	ret += len;
	94
	95	kfree(list->buffer[list->tail].value);
	96	list->tail = (list->tail + 1) & (HIDRAW_BUFFER_SIZE - 1);
	97	}
	98	out:
	99	mutex_unlock(&list->read_mutex);
	100	return ret;
	101	}
	102
	103	/* the first byte is expected to be a report number */
	104	static ssize_t hidraw_write(struct file file, const char __user buffer, size_t count, loff_t *ppos)
	105	{
	106	unsigned int minor = iminor(file->f_path.dentry->d_inode);
2e57480b	107	struct hid_device *dev;
86166b7b JK	108	__u8 *buf;
	109	int ret = 0;
	110
2e57480b JK	111	mutex_lock(&minors_lock);
	112	dev = hidraw_table[minor]->hid;
	113
	114	if (!dev->hid_output_raw_report) {
	115	ret = -ENODEV;
	116	goto out;
	117	}
86166b7b	118
2b107d62	119	if (count > HID_MAX_BUFFER_SIZE) {
86166b7b	120	printk(KERN_WARNING "hidraw: pid %d passed too large report\n",
ba25f9dc	121	task_pid_nr(current));
2e57480b JK	122	ret = -EINVAL;
2e57480b JK	123	goto out;
86166b7b JK	124	}
	125
	126	if (count < 2) {
	127	printk(KERN_WARNING "hidraw: pid %d passed too short report\n",
ba25f9dc	128	task_pid_nr(current));
2e57480b JK	129	ret = -EINVAL;
2e57480b JK	130	goto out;
86166b7b JK	131	}
	132
	133	buf = kmalloc(count * sizeof(__u8), GFP_KERNEL);
2e57480b JK	134	if (!buf) {
	135	ret = -ENOMEM;
	136	goto out;
	137	}
86166b7b JK	138
	139	if (copy_from_user(buf, buffer, count)) {
	140	ret = -EFAULT;
2e57480b	141	goto out_free;
86166b7b JK	142	}
86166b7b JK	143
d4bfa033	144	ret = dev->hid_output_raw_report(dev, buf, count, HID_OUTPUT_REPORT);
2e57480b	145	out_free:
86166b7b	146	kfree(buf);
2e57480b JK	147	out:
2e57480b JK	148	mutex_unlock(&minors_lock);
86166b7b JK	149	return ret;
	150	}
	151
	152	static unsigned int hidraw_poll(struct file file, poll_table wait)
	153	{
	154	struct hidraw_list *list = file->private_data;
	155
	156	poll_wait(file, &list->hidraw->wait, wait);
	157	if (list->head != list->tail)
	158	return POLLIN \| POLLRDNORM;
	159	if (!list->hidraw->exist)
	160	return POLLERR \| POLLHUP;
	161	return 0;
	162	}
	163
	164	static int hidraw_open(struct inode inode, struct file file)
	165	{
	166	unsigned int minor = iminor(inode);
	167	struct hidraw *dev;
	168	struct hidraw_list *list;
	169	int err = 0;
	170
	171	if (!(list = kzalloc(sizeof(struct hidraw_list), GFP_KERNEL))) {
	172	err = -ENOMEM;
	173	goto out;
	174	}
	175
7d672cd7	176	mutex_lock(&minors_lock);
86166b7b	177	if (!hidraw_table[minor]) {
86166b7b JK	178	kfree(list);
	179	err = -ENODEV;
	180	goto out_unlock;
	181	}
	182
	183	list->hidraw = hidraw_table[minor];
	184	mutex_init(&list->read_mutex);
	185	list_add_tail(&list->node, &hidraw_table[minor]->list);
	186	file->private_data = list;
	187
	188	dev = hidraw_table[minor];
7d672cd7	189	if (!dev->open++) {
0361a28d ON	190	if (dev->hid->ll_driver->power) {
	191	err = dev->hid->ll_driver->power(dev->hid, PM_HINT_FULLON);
	192	if (err < 0)
	193	goto out_unlock;
	194	}
7d672cd7	195	err = dev->hid->ll_driver->open(dev->hid);
0361a28d ON	196	if (err < 0) {
	197	if (dev->hid->ll_driver->power)
	198	dev->hid->ll_driver->power(dev->hid, PM_HINT_NORMAL);
7d672cd7	199	dev->open--;
0361a28d	200	}
7d672cd7	201	}
86166b7b JK	202
86166b7b JK	203	out_unlock:
7d672cd7	204	mutex_unlock(&minors_lock);
7d672cd7	205	out:
86166b7b JK	206	return err;
	207
	208	}
	209
	210	static int hidraw_release(struct inode * inode, struct file * file)
	211	{
	212	unsigned int minor = iminor(inode);
	213	struct hidraw *dev;
	214	struct hidraw_list *list = file->private_data;
	215
0a504541	216	if (!hidraw_table[minor])
86166b7b	217	return -ENODEV;
86166b7b JK	218
	219	list_del(&list->node);
	220	dev = hidraw_table[minor];
b8a832b1	221	if (!--dev->open) {
0361a28d ON	222	if (list->hidraw->exist) {
	223	if (dev->hid->ll_driver->power)
	224	dev->hid->ll_driver->power(dev->hid, PM_HINT_NORMAL);
c500c971	225	dev->hid->ll_driver->close(dev->hid);
0361a28d	226	} else {
86166b7b	227	kfree(list->hidraw);
0361a28d	228	}
86166b7b JK	229	}
86166b7b JK	230
4db1c62c JK	231	kfree(list);
4db1c62c JK	232
86166b7b JK	233	return 0;
	234	}
	235
979c407e AC	236	static long hidraw_ioctl(struct file *file, unsigned int cmd,
979c407e AC	237	unsigned long arg)
86166b7b	238	{
979c407e	239	struct inode *inode = file->f_path.dentry->d_inode;
86166b7b	240	unsigned int minor = iminor(inode);
979c407e	241	long ret = 0;
2e57480b	242	struct hidraw *dev;
86166b7b JK	243	void __user user_arg = (void __user) arg;
86166b7b JK	244
2e57480b JK	245	mutex_lock(&minors_lock);
	246	dev = hidraw_table[minor];
	247
86166b7b JK	248	switch (cmd) {
	249	case HIDIOCGRDESCSIZE:
	250	if (put_user(dev->hid->rsize, (int __user *)arg))
979c407e AC	251	ret = -EFAULT;
979c407e AC	252	break;
86166b7b JK	253
	254	case HIDIOCGRDESC:
	255	{
	256	__u32 len;
	257
	258	if (get_user(len, (int __user *)arg))
979c407e AC	259	ret = -EFAULT;
	260	else if (len > HID_MAX_DESCRIPTOR_SIZE - 1)
	261	ret = -EINVAL;
	262	else if (copy_to_user(user_arg + offsetof(
	263	struct hidraw_report_descriptor,
	264	value[0]),
	265	dev->hid->rdesc,
	266	min(dev->hid->rsize, len)))
	267	ret = -EFAULT;
	268	break;
86166b7b JK	269	}
	270	case HIDIOCGRAWINFO:
	271	{
	272	struct hidraw_devinfo dinfo;
	273
	274	dinfo.bustype = dev->hid->bus;
	275	dinfo.vendor = dev->hid->vendor;
	276	dinfo.product = dev->hid->product;
	277	if (copy_to_user(user_arg, &dinfo, sizeof(dinfo)))
979c407e AC	278	ret = -EFAULT;
979c407e AC	279	break;
86166b7b JK	280	}
86166b7b JK	281	default:
9188e79e JK	282	{
9188e79e JK	283	struct hid_device *hid = dev->hid;
dfd395af DC	284	if (_IOC_TYPE(cmd) != 'H' \|\| _IOC_DIR(cmd) != _IOC_READ) {
	285	ret = -EINVAL;
	286	break;
	287	}
9188e79e JK	288
	289	if (_IOC_NR(cmd) == _IOC_NR(HIDIOCGRAWNAME(0))) {
	290	int len;
38089c65 DC	291	if (!hid->name) {
	292	ret = 0;
	293	break;
	294	}
9188e79e JK	295	len = strlen(hid->name) + 1;
	296	if (len > _IOC_SIZE(cmd))
	297	len = _IOC_SIZE(cmd);
dfd395af	298	ret = copy_to_user(user_arg, hid->name, len) ?
9188e79e	299	-EFAULT : len;
dfd395af	300	break;
9188e79e JK	301	}
	302
	303	if (_IOC_NR(cmd) == _IOC_NR(HIDIOCGRAWPHYS(0))) {
	304	int len;
38089c65 DC	305	if (!hid->phys) {
	306	ret = 0;
	307	break;
	308	}
9188e79e JK	309	len = strlen(hid->phys) + 1;
	310	if (len > _IOC_SIZE(cmd))
	311	len = _IOC_SIZE(cmd);
dfd395af	312	ret = copy_to_user(user_arg, hid->phys, len) ?
9188e79e	313	-EFAULT : len;
dfd395af	314	break;
9188e79e	315	}
81cd5843	316	}
9188e79e	317
dfd395af	318	ret = -ENOTTY;
86166b7b	319	}
2e57480b	320	mutex_unlock(&minors_lock);
979c407e	321	return ret;
86166b7b JK	322	}
	323
	324	static const struct file_operations hidraw_ops = {
	325	.owner = THIS_MODULE,
	326	.read = hidraw_read,
	327	.write = hidraw_write,
	328	.poll = hidraw_poll,
	329	.open = hidraw_open,
	330	.release = hidraw_release,
979c407e	331	.unlocked_ioctl = hidraw_ioctl,
6038f373	332	.llseek = noop_llseek,
86166b7b JK	333	};
	334
	335	void hidraw_report_event(struct hid_device hid, u8 data, int len)
	336	{
	337	struct hidraw *dev = hid->hidraw;
	338	struct hidraw_list *list;
	339
	340	list_for_each_entry(list, &dev->list, node) {
	341	list->buffer[list->head].value = kmemdup(data, len, GFP_ATOMIC);
	342	list->buffer[list->head].len = len;
	343	list->head = (list->head + 1) & (HIDRAW_BUFFER_SIZE - 1);
	344	kill_fasync(&list->fasync, SIGIO, POLL_IN);
	345	}
	346
	347	wake_up_interruptible(&dev->wait);
	348	}
	349	EXPORT_SYMBOL_GPL(hidraw_report_event);
	350
	351	int hidraw_connect(struct hid_device *hid)
	352	{
709d27c0	353	int minor, result;
86166b7b JK	354	struct hidraw *dev;
86166b7b JK	355
bbe281fa	356	/* we accept any HID device, no matter the applications */
86166b7b	357
709d27c0 MK	358	dev = kzalloc(sizeof(struct hidraw), GFP_KERNEL);
	359	if (!dev)
	360	return -ENOMEM;
	361
	362	result = -EINVAL;
86166b7b	363
7d672cd7	364	mutex_lock(&minors_lock);
86166b7b JK	365
	366	for (minor = 0; minor < HIDRAW_MAX_DEVICES; minor++) {
	367	if (hidraw_table[minor])
	368	continue;
	369	hidraw_table[minor] = dev;
	370	result = 0;
	371	break;
	372	}
	373
709d27c0	374	if (result) {
7d672cd7	375	mutex_unlock(&minors_lock);
709d27c0	376	kfree(dev);
86166b7b	377	goto out;
709d27c0	378	}
86166b7b	379
aae6c286	380	dev->dev = device_create(hidraw_class, &hid->dev, MKDEV(hidraw_major, minor),
a9b12619	381	NULL, "%s%d", "hidraw", minor);
86166b7b JK	382
86166b7b JK	383	if (IS_ERR(dev->dev)) {
86166b7b	384	hidraw_table[minor] = NULL;
7d672cd7	385	mutex_unlock(&minors_lock);
86166b7b	386	result = PTR_ERR(dev->dev);
709d27c0	387	kfree(dev);
86166b7b JK	388	goto out;
	389	}
	390
7d672cd7	391	mutex_unlock(&minors_lock);
86166b7b JK	392	init_waitqueue_head(&dev->wait);
	393	INIT_LIST_HEAD(&dev->list);
	394
	395	dev->hid = hid;
	396	dev->minor = minor;
	397
	398	dev->exist = 1;
	399	hid->hidraw = dev;
	400
	401	out:
	402	return result;
	403
	404	}
	405	EXPORT_SYMBOL_GPL(hidraw_connect);
	406
	407	void hidraw_disconnect(struct hid_device *hid)
	408	{
	409	struct hidraw *hidraw = hid->hidraw;
	410
	411	hidraw->exist = 0;
	412
7d672cd7	413	mutex_lock(&minors_lock);
86166b7b	414	hidraw_table[hidraw->minor] = NULL;
7d672cd7	415	mutex_unlock(&minors_lock);
86166b7b JK	416
	417	device_destroy(hidraw_class, MKDEV(hidraw_major, hidraw->minor));
	418
	419	if (hidraw->open) {
c500c971	420	hid->ll_driver->close(hid);
86166b7b JK	421	wake_up_interruptible(&hidraw->wait);
	422	} else {
	423	kfree(hidraw);
	424	}
	425	}
	426	EXPORT_SYMBOL_GPL(hidraw_disconnect);
	427
	428	int __init hidraw_init(void)
	429	{
	430	int result;
	431	dev_t dev_id;
	432
	433	result = alloc_chrdev_region(&dev_id, HIDRAW_FIRST_MINOR,
	434	HIDRAW_MAX_DEVICES, "hidraw");
	435
	436	hidraw_major = MAJOR(dev_id);
	437
	438	if (result < 0) {
	439	printk(KERN_WARNING "hidraw: can't get major number\n");
	440	result = 0;
	441	goto out;
	442	}
	443
	444	hidraw_class = class_create(THIS_MODULE, "hidraw");
	445	if (IS_ERR(hidraw_class)) {
	446	result = PTR_ERR(hidraw_class);
	447	unregister_chrdev(hidraw_major, "hidraw");
	448	goto out;
	449	}
	450
	451	cdev_init(&hidraw_cdev, &hidraw_ops);
	452	cdev_add(&hidraw_cdev, dev_id, HIDRAW_MAX_DEVICES);
	453	out:
	454	return result;
	455	}
	456
140ae3eb	457	void hidraw_exit(void)
86166b7b JK	458	{
	459	dev_t dev_id = MKDEV(hidraw_major, 0);
	460
	461	cdev_del(&hidraw_cdev);
	462	class_destroy(hidraw_class);
	463	unregister_chrdev_region(dev_id, HIDRAW_MAX_DEVICES);
	464
	465	}