[mirror_ubuntu-hirsute-kernel.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.
 */

#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt

#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/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);

	if (!hidraw_table[minor]) {
		ret = -ENODEV;
		goto out;
	}

	dev = hidraw_table[minor]->hid;

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

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

	if (count < 2) {
		hid_warn(dev, "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++) {
		err = hid_hw_power(dev->hid, PM_HINT_FULLON);
		if (err < 0)
			goto out_unlock;

		err = hid_hw_open(dev->hid);
		if (err < 0) {
			hid_hw_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;
	int ret;

	mutex_lock(&minors_lock);
	if (!hidraw_table[minor]) {
		ret = -ENODEV;
		goto unlock;
	}

	list_del(&list->node);
	dev = hidraw_table[minor];
	if (!--dev->open) {
		if (list->hidraw->exist) {
			hid_hw_power(dev->hid, PM_HINT_NORMAL);
			hid_hw_close(dev->hid);
		} else {
			kfree(list->hidraw);
		}
	}
	kfree(list);
	ret = 0;
unlock:
	mutex_unlock(&minors_lock);

	return ret;
}

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

	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;
	}
out:
	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_hw_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) {
		pr_warn("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
4291ee30 JP	22	#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
4291ee30 JP	23
86166b7b JK	24	#include <linux/fs.h>
	25	#include <linux/module.h>
	26	#include <linux/errno.h>
	27	#include <linux/kernel.h>
	28	#include <linux/init.h>
	29	#include <linux/cdev.h>
	30	#include <linux/poll.h>
	31	#include <linux/device.h>
	32	#include <linux/major.h>
5a0e3ad6	33	#include <linux/slab.h>
86166b7b JK	34	#include <linux/hid.h>
86166b7b JK	35	#include <linux/mutex.h>
a99bbaf5	36	#include <linux/sched.h>
86166b7b JK	37
	38	#include <linux/hidraw.h>
	39
	40	static int hidraw_major;
	41	static struct cdev hidraw_cdev;
	42	static struct class *hidraw_class;
	43	static struct hidraw *hidraw_table[HIDRAW_MAX_DEVICES];
7d672cd7	44	static DEFINE_MUTEX(minors_lock);
86166b7b JK	45
	46	static ssize_t hidraw_read(struct file file, char __user buffer, size_t count, loff_t *ppos)
	47	{
	48	struct hidraw_list *list = file->private_data;
	49	int ret = 0, len;
86166b7b JK	50	DECLARE_WAITQUEUE(wait, current);
86166b7b JK	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
86166b7b JK	87	len = list->buffer[list->tail].len > count ?
	88	count : list->buffer[list->tail].len;
	89
	90	if (copy_to_user(buffer, list->buffer[list->tail].value, len)) {
	91	ret = -EFAULT;
	92	goto out;
	93	}
	94	ret += len;
	95
	96	kfree(list->buffer[list->tail].value);
	97	list->tail = (list->tail + 1) & (HIDRAW_BUFFER_SIZE - 1);
	98	}
	99	out:
	100	mutex_unlock(&list->read_mutex);
	101	return ret;
	102	}
	103
	104	/* the first byte is expected to be a report number */
	105	static ssize_t hidraw_write(struct file file, const char __user buffer, size_t count, loff_t *ppos)
	106	{
	107	unsigned int minor = iminor(file->f_path.dentry->d_inode);
2e57480b	108	struct hid_device *dev;
86166b7b JK	109	__u8 *buf;
	110	int ret = 0;
	111
2e57480b	112	mutex_lock(&minors_lock);
e42dee9a AO	113
	114	if (!hidraw_table[minor]) {
	115	ret = -ENODEV;
	116	goto out;
	117	}
	118
2e57480b JK	119	dev = hidraw_table[minor]->hid;
	120
	121	if (!dev->hid_output_raw_report) {
	122	ret = -ENODEV;
	123	goto out;
	124	}
86166b7b	125
2b107d62	126	if (count > HID_MAX_BUFFER_SIZE) {
4291ee30 JP	127	hid_warn(dev, "pid %d passed too large report\n",
4291ee30 JP	128	task_pid_nr(current));
2e57480b JK	129	ret = -EINVAL;
2e57480b JK	130	goto out;
86166b7b JK	131	}
	132
	133	if (count < 2) {
4291ee30 JP	134	hid_warn(dev, "pid %d passed too short report\n",
4291ee30 JP	135	task_pid_nr(current));
2e57480b JK	136	ret = -EINVAL;
2e57480b JK	137	goto out;
86166b7b JK	138	}
	139
	140	buf = kmalloc(count * sizeof(__u8), GFP_KERNEL);
2e57480b JK	141	if (!buf) {
	142	ret = -ENOMEM;
	143	goto out;
	144	}
86166b7b JK	145
	146	if (copy_from_user(buf, buffer, count)) {
	147	ret = -EFAULT;
2e57480b	148	goto out_free;
86166b7b JK	149	}
86166b7b JK	150
d4bfa033	151	ret = dev->hid_output_raw_report(dev, buf, count, HID_OUTPUT_REPORT);
2e57480b	152	out_free:
86166b7b	153	kfree(buf);
2e57480b JK	154	out:
2e57480b JK	155	mutex_unlock(&minors_lock);
86166b7b JK	156	return ret;
	157	}
	158
	159	static unsigned int hidraw_poll(struct file file, poll_table wait)
	160	{
	161	struct hidraw_list *list = file->private_data;
	162
	163	poll_wait(file, &list->hidraw->wait, wait);
	164	if (list->head != list->tail)
	165	return POLLIN \| POLLRDNORM;
	166	if (!list->hidraw->exist)
	167	return POLLERR \| POLLHUP;
	168	return 0;
	169	}
	170
	171	static int hidraw_open(struct inode inode, struct file file)
	172	{
	173	unsigned int minor = iminor(inode);
	174	struct hidraw *dev;
	175	struct hidraw_list *list;
	176	int err = 0;
	177
	178	if (!(list = kzalloc(sizeof(struct hidraw_list), GFP_KERNEL))) {
	179	err = -ENOMEM;
	180	goto out;
	181	}
	182
7d672cd7	183	mutex_lock(&minors_lock);
86166b7b	184	if (!hidraw_table[minor]) {
86166b7b JK	185	kfree(list);
	186	err = -ENODEV;
	187	goto out_unlock;
	188	}
	189
	190	list->hidraw = hidraw_table[minor];
	191	mutex_init(&list->read_mutex);
	192	list_add_tail(&list->node, &hidraw_table[minor]->list);
	193	file->private_data = list;
	194
	195	dev = hidraw_table[minor];
7d672cd7	196	if (!dev->open++) {
5bea7660 DT	197	err = hid_hw_power(dev->hid, PM_HINT_FULLON);
	198	if (err < 0)
	199	goto out_unlock;
	200
	201	err = hid_hw_open(dev->hid);
0361a28d	202	if (err < 0) {
5bea7660	203	hid_hw_power(dev->hid, PM_HINT_NORMAL);
7d672cd7	204	dev->open--;
0361a28d	205	}
7d672cd7	206	}
86166b7b JK	207
86166b7b JK	208	out_unlock:
7d672cd7	209	mutex_unlock(&minors_lock);
7d672cd7	210	out:
86166b7b JK	211	return err;
	212
	213	}
	214
	215	static int hidraw_release(struct inode * inode, struct file * file)
	216	{
	217	unsigned int minor = iminor(inode);
	218	struct hidraw *dev;
	219	struct hidraw_list *list = file->private_data;
cb174681	220	int ret;
86166b7b	221
cb174681 JS	222	mutex_lock(&minors_lock);
	223	if (!hidraw_table[minor]) {
	224	ret = -ENODEV;
	225	goto unlock;
	226	}
86166b7b JK	227
	228	list_del(&list->node);
	229	dev = hidraw_table[minor];
b8a832b1	230	if (!--dev->open) {
0361a28d	231	if (list->hidraw->exist) {
5bea7660 DT	232	hid_hw_power(dev->hid, PM_HINT_NORMAL);
5bea7660 DT	233	hid_hw_close(dev->hid);
0361a28d	234	} else {
86166b7b	235	kfree(list->hidraw);
0361a28d	236	}
86166b7b	237	}
4db1c62c	238	kfree(list);
cb174681 JS	239	ret = 0;
	240	unlock:
	241	mutex_unlock(&minors_lock);
4db1c62c	242
cb174681	243	return ret;
86166b7b JK	244	}
86166b7b JK	245
979c407e AC	246	static long hidraw_ioctl(struct file *file, unsigned int cmd,
979c407e AC	247	unsigned long arg)
86166b7b	248	{
979c407e	249	struct inode *inode = file->f_path.dentry->d_inode;
86166b7b	250	unsigned int minor = iminor(inode);
979c407e	251	long ret = 0;
2e57480b	252	struct hidraw *dev;
86166b7b JK	253	void __user user_arg = (void __user) arg;
86166b7b JK	254
2e57480b JK	255	mutex_lock(&minors_lock);
2e57480b JK	256	dev = hidraw_table[minor];
d20d5ffa AO	257	if (!dev) {
	258	ret = -ENODEV;
	259	goto out;
	260	}
2e57480b	261
86166b7b JK	262	switch (cmd) {
	263	case HIDIOCGRDESCSIZE:
	264	if (put_user(dev->hid->rsize, (int __user *)arg))
979c407e AC	265	ret = -EFAULT;
979c407e AC	266	break;
86166b7b JK	267
	268	case HIDIOCGRDESC:
	269	{
	270	__u32 len;
	271
	272	if (get_user(len, (int __user *)arg))
979c407e AC	273	ret = -EFAULT;
	274	else if (len > HID_MAX_DESCRIPTOR_SIZE - 1)
	275	ret = -EINVAL;
	276	else if (copy_to_user(user_arg + offsetof(
	277	struct hidraw_report_descriptor,
	278	value[0]),
	279	dev->hid->rdesc,
	280	min(dev->hid->rsize, len)))
	281	ret = -EFAULT;
	282	break;
86166b7b JK	283	}
	284	case HIDIOCGRAWINFO:
	285	{
	286	struct hidraw_devinfo dinfo;
	287
	288	dinfo.bustype = dev->hid->bus;
	289	dinfo.vendor = dev->hid->vendor;
	290	dinfo.product = dev->hid->product;
	291	if (copy_to_user(user_arg, &dinfo, sizeof(dinfo)))
979c407e AC	292	ret = -EFAULT;
979c407e AC	293	break;
86166b7b JK	294	}
86166b7b JK	295	default:
9188e79e JK	296	{
9188e79e JK	297	struct hid_device *hid = dev->hid;
dfd395af DC	298	if (_IOC_TYPE(cmd) != 'H' \|\| _IOC_DIR(cmd) != _IOC_READ) {
	299	ret = -EINVAL;
	300	break;
	301	}
9188e79e JK	302
	303	if (_IOC_NR(cmd) == _IOC_NR(HIDIOCGRAWNAME(0))) {
	304	int len;
38089c65 DC	305	if (!hid->name) {
	306	ret = 0;
	307	break;
	308	}
9188e79e JK	309	len = strlen(hid->name) + 1;
	310	if (len > _IOC_SIZE(cmd))
	311	len = _IOC_SIZE(cmd);
dfd395af	312	ret = copy_to_user(user_arg, hid->name, len) ?
9188e79e	313	-EFAULT : len;
dfd395af	314	break;
9188e79e JK	315	}
	316
	317	if (_IOC_NR(cmd) == _IOC_NR(HIDIOCGRAWPHYS(0))) {
	318	int len;
38089c65 DC	319	if (!hid->phys) {
	320	ret = 0;
	321	break;
	322	}
9188e79e JK	323	len = strlen(hid->phys) + 1;
	324	if (len > _IOC_SIZE(cmd))
	325	len = _IOC_SIZE(cmd);
dfd395af	326	ret = copy_to_user(user_arg, hid->phys, len) ?
9188e79e	327	-EFAULT : len;
dfd395af	328	break;
9188e79e	329	}
81cd5843	330	}
9188e79e	331
dfd395af	332	ret = -ENOTTY;
86166b7b	333	}
d20d5ffa	334	out:
2e57480b	335	mutex_unlock(&minors_lock);
979c407e	336	return ret;
86166b7b JK	337	}
	338
	339	static const struct file_operations hidraw_ops = {
	340	.owner = THIS_MODULE,
	341	.read = hidraw_read,
	342	.write = hidraw_write,
	343	.poll = hidraw_poll,
	344	.open = hidraw_open,
	345	.release = hidraw_release,
979c407e	346	.unlocked_ioctl = hidraw_ioctl,
6038f373	347	.llseek = noop_llseek,
86166b7b JK	348	};
	349
	350	void hidraw_report_event(struct hid_device hid, u8 data, int len)
	351	{
	352	struct hidraw *dev = hid->hidraw;
	353	struct hidraw_list *list;
	354
	355	list_for_each_entry(list, &dev->list, node) {
	356	list->buffer[list->head].value = kmemdup(data, len, GFP_ATOMIC);
	357	list->buffer[list->head].len = len;
	358	list->head = (list->head + 1) & (HIDRAW_BUFFER_SIZE - 1);
	359	kill_fasync(&list->fasync, SIGIO, POLL_IN);
	360	}
	361
	362	wake_up_interruptible(&dev->wait);
	363	}
	364	EXPORT_SYMBOL_GPL(hidraw_report_event);
	365
	366	int hidraw_connect(struct hid_device *hid)
	367	{
709d27c0	368	int minor, result;
86166b7b JK	369	struct hidraw *dev;
86166b7b JK	370
bbe281fa	371	/* we accept any HID device, no matter the applications */
86166b7b	372
709d27c0 MK	373	dev = kzalloc(sizeof(struct hidraw), GFP_KERNEL);
	374	if (!dev)
	375	return -ENOMEM;
	376
	377	result = -EINVAL;
86166b7b	378
7d672cd7	379	mutex_lock(&minors_lock);
86166b7b JK	380
	381	for (minor = 0; minor < HIDRAW_MAX_DEVICES; minor++) {
	382	if (hidraw_table[minor])
	383	continue;
	384	hidraw_table[minor] = dev;
	385	result = 0;
	386	break;
	387	}
	388
709d27c0	389	if (result) {
7d672cd7	390	mutex_unlock(&minors_lock);
709d27c0	391	kfree(dev);
86166b7b	392	goto out;
709d27c0	393	}
86166b7b	394
aae6c286	395	dev->dev = device_create(hidraw_class, &hid->dev, MKDEV(hidraw_major, minor),
a9b12619	396	NULL, "%s%d", "hidraw", minor);
86166b7b JK	397
86166b7b JK	398	if (IS_ERR(dev->dev)) {
86166b7b	399	hidraw_table[minor] = NULL;
7d672cd7	400	mutex_unlock(&minors_lock);
86166b7b	401	result = PTR_ERR(dev->dev);
709d27c0	402	kfree(dev);
86166b7b JK	403	goto out;
	404	}
	405
7d672cd7	406	mutex_unlock(&minors_lock);
86166b7b JK	407	init_waitqueue_head(&dev->wait);
	408	INIT_LIST_HEAD(&dev->list);
	409
	410	dev->hid = hid;
	411	dev->minor = minor;
	412
	413	dev->exist = 1;
	414	hid->hidraw = dev;
	415
	416	out:
	417	return result;
	418
	419	}
	420	EXPORT_SYMBOL_GPL(hidraw_connect);
	421
	422	void hidraw_disconnect(struct hid_device *hid)
	423	{
	424	struct hidraw *hidraw = hid->hidraw;
	425
	426	hidraw->exist = 0;
	427
7d672cd7	428	mutex_lock(&minors_lock);
86166b7b	429	hidraw_table[hidraw->minor] = NULL;
7d672cd7	430	mutex_unlock(&minors_lock);
86166b7b JK	431
	432	device_destroy(hidraw_class, MKDEV(hidraw_major, hidraw->minor));
	433
	434	if (hidraw->open) {
5bea7660	435	hid_hw_close(hid);
86166b7b JK	436	wake_up_interruptible(&hidraw->wait);
	437	} else {
	438	kfree(hidraw);
	439	}
	440	}
	441	EXPORT_SYMBOL_GPL(hidraw_disconnect);
	442
	443	int __init hidraw_init(void)
	444	{
	445	int result;
	446	dev_t dev_id;
	447
	448	result = alloc_chrdev_region(&dev_id, HIDRAW_FIRST_MINOR,
	449	HIDRAW_MAX_DEVICES, "hidraw");
	450
	451	hidraw_major = MAJOR(dev_id);
	452
	453	if (result < 0) {
4291ee30	454	pr_warn("can't get major number\n");
86166b7b JK	455	result = 0;
	456	goto out;
	457	}
	458
	459	hidraw_class = class_create(THIS_MODULE, "hidraw");
	460	if (IS_ERR(hidraw_class)) {
	461	result = PTR_ERR(hidraw_class);
	462	unregister_chrdev(hidraw_major, "hidraw");
	463	goto out;
	464	}
	465
	466	cdev_init(&hidraw_cdev, &hidraw_ops);
	467	cdev_add(&hidraw_cdev, dev_id, HIDRAW_MAX_DEVICES);
	468	out:
	469	return result;
	470	}
	471
140ae3eb	472	void hidraw_exit(void)
86166b7b JK	473	{
	474	dev_t dev_id = MKDEV(hidraw_major, 0);
	475
	476	cdev_del(&hidraw_cdev);
	477	class_destroy(hidraw_class);
	478	unregister_chrdev_region(dev_id, HIDRAW_MAX_DEVICES);
	479
	480	}