[linux-block.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.
 * This function is to be called with the minors_lock mutex held */
static ssize_t hidraw_send_report(struct file *file, const char __user *buffer, size_t count, unsigned char report_type)
{
	unsigned int minor = iminor(file->f_path.dentry->d_inode);
	struct hid_device *dev;
	__u8 *buf;
	int ret = 0;

	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, report_type);
out_free:
	kfree(buf);
out:
	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)
{
	ssize_t ret;
	mutex_lock(&minors_lock);
	ret = hidraw_send_report(file, buffer, count, HID_OUTPUT_REPORT);
	mutex_unlock(&minors_lock);
	return ret;
}


/* This function performs a Get_Report transfer over the control endpoint
 * per section 7.2.1 of the HID specification, version 1.1.  The first byte
 * of buffer is the report number to request, or 0x0 if the defice does not
 * use numbered reports. The report_type parameter can be HID_FEATURE_REPORT
 * or HID_INPUT_REPORT.  This function is to be called with the minors_lock
 *  mutex held. */
static ssize_t hidraw_get_report(struct file *file, char __user *buffer, size_t count, unsigned char report_type)
{
	unsigned int minor = iminor(file->f_path.dentry->d_inode);
	struct hid_device *dev;
	__u8 *buf;
	int ret = 0, len;
	unsigned char report_number;

	dev = hidraw_table[minor]->hid;

	if (!dev->hid_get_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;
	}

	/* Read the first byte from the user. This is the report number,
	 * which is passed to dev->hid_get_raw_report(). */
	if (copy_from_user(&report_number, buffer, 1)) {
		ret = -EFAULT;
		goto out_free;
	}

	ret = dev->hid_get_raw_report(dev, report_number, buf, count, report_type);

	if (ret < 0)
		goto out_free;

	len = (ret < count) ? ret : count;

	if (copy_to_user(buffer, buf, len)) {
		ret = -EFAULT;
		goto out_free;
	}

	ret = len;

out_free:
	kfree(buf);
out:
	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') {
					ret = -EINVAL;
					break;
				}

				if (_IOC_NR(cmd) == _IOC_NR(HIDIOCSFEATURE(0))) {
					int len = _IOC_SIZE(cmd);
					ret = hidraw_send_report(file, user_arg, len, HID_FEATURE_REPORT);
					break;
				}
				if (_IOC_NR(cmd) == _IOC_NR(HIDIOCGFEATURE(0))) {
					int len = _IOC_SIZE(cmd);
					ret = hidraw_get_report(file, user_arg, len, HID_FEATURE_REPORT);
					break;
				}

				/* Begin Read-only ioctls. */
				if (_IOC_DIR(cmd) != _IOC_READ) {
					ret = -EINVAL;
					break;
				}

				if (_IOC_NR(cmd) == _IOC_NR(HIDIOCGRAWNAME(0))) {
					int 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 = 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,
#ifdef CONFIG_COMPAT
	.compat_ioctl   = hidraw_ioctl,
#endif
	.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;

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

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

	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	}
cf28a673	94	ret = len;
86166b7b JK	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
d2a1cfeb JK	104	/* The first byte is expected to be a report number.
d2a1cfeb JK	105	* This function is to be called with the minors_lock mutex held */
b4dbde9d	106	static ssize_t hidraw_send_report(struct file file, const char __user buffer, size_t count, unsigned char report_type)
86166b7b JK	107	{
86166b7b JK	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
e42dee9a AO	113	if (!hidraw_table[minor]) {
	114	ret = -ENODEV;
	115	goto out;
	116	}
	117
2e57480b JK	118	dev = hidraw_table[minor]->hid;
	119
	120	if (!dev->hid_output_raw_report) {
	121	ret = -ENODEV;
	122	goto out;
	123	}
86166b7b	124
2b107d62	125	if (count > HID_MAX_BUFFER_SIZE) {
4291ee30 JP	126	hid_warn(dev, "pid %d passed too large report\n",
4291ee30 JP	127	task_pid_nr(current));
2e57480b JK	128	ret = -EINVAL;
2e57480b JK	129	goto out;
86166b7b JK	130	}
	131
	132	if (count < 2) {
4291ee30 JP	133	hid_warn(dev, "pid %d passed too short report\n",
4291ee30 JP	134	task_pid_nr(current));
2e57480b JK	135	ret = -EINVAL;
2e57480b JK	136	goto out;
86166b7b JK	137	}
	138
	139	buf = kmalloc(count * sizeof(__u8), GFP_KERNEL);
2e57480b JK	140	if (!buf) {
	141	ret = -ENOMEM;
	142	goto out;
	143	}
86166b7b JK	144
	145	if (copy_from_user(buf, buffer, count)) {
	146	ret = -EFAULT;
2e57480b	147	goto out_free;
86166b7b JK	148	}
86166b7b JK	149
b4dbde9d	150	ret = dev->hid_output_raw_report(dev, buf, count, report_type);
2e57480b	151	out_free:
86166b7b	152	kfree(buf);
2e57480b	153	out:
b4dbde9d AO	154	return ret;
	155	}
	156
	157	/* the first byte is expected to be a report number */
	158	static ssize_t hidraw_write(struct file file, const char __user buffer, size_t count, loff_t *ppos)
	159	{
	160	ssize_t ret;
	161	mutex_lock(&minors_lock);
	162	ret = hidraw_send_report(file, buffer, count, HID_OUTPUT_REPORT);
2e57480b	163	mutex_unlock(&minors_lock);
86166b7b JK	164	return ret;
	165	}
	166
b4dbde9d AO	167
b4dbde9d AO	168	/* This function performs a Get_Report transfer over the control endpoint
d2a1cfeb JK	169	* per section 7.2.1 of the HID specification, version 1.1. The first byte
	170	* of buffer is the report number to request, or 0x0 if the defice does not
	171	* use numbered reports. The report_type parameter can be HID_FEATURE_REPORT
	172	* or HID_INPUT_REPORT. This function is to be called with the minors_lock
	173	* mutex held. */
b4dbde9d AO	174	static ssize_t hidraw_get_report(struct file file, char __user buffer, size_t count, unsigned char report_type)
	175	{
	176	unsigned int minor = iminor(file->f_path.dentry->d_inode);
	177	struct hid_device *dev;
	178	__u8 *buf;
	179	int ret = 0, len;
	180	unsigned char report_number;
	181
	182	dev = hidraw_table[minor]->hid;
	183
	184	if (!dev->hid_get_raw_report) {
	185	ret = -ENODEV;
	186	goto out;
	187	}
	188
	189	if (count > HID_MAX_BUFFER_SIZE) {
	190	printk(KERN_WARNING "hidraw: pid %d passed too large report\n",
	191	task_pid_nr(current));
	192	ret = -EINVAL;
	193	goto out;
	194	}
	195
	196	if (count < 2) {
	197	printk(KERN_WARNING "hidraw: pid %d passed too short report\n",
	198	task_pid_nr(current));
	199	ret = -EINVAL;
	200	goto out;
	201	}
	202
	203	buf = kmalloc(count * sizeof(__u8), GFP_KERNEL);
	204	if (!buf) {
	205	ret = -ENOMEM;
	206	goto out;
	207	}
	208
	209	/* Read the first byte from the user. This is the report number,
d2a1cfeb	210	* which is passed to dev->hid_get_raw_report(). */
b4dbde9d AO	211	if (copy_from_user(&report_number, buffer, 1)) {
	212	ret = -EFAULT;
	213	goto out_free;
	214	}
	215
	216	ret = dev->hid_get_raw_report(dev, report_number, buf, count, report_type);
	217
	218	if (ret < 0)
	219	goto out_free;
	220
	221	len = (ret < count) ? ret : count;
	222
	223	if (copy_to_user(buffer, buf, len)) {
	224	ret = -EFAULT;
	225	goto out_free;
	226	}
	227
	228	ret = len;
	229
	230	out_free:
	231	kfree(buf);
	232	out:
	233	return ret;
	234	}
	235
86166b7b JK	236	static unsigned int hidraw_poll(struct file file, poll_table wait)
	237	{
	238	struct hidraw_list *list = file->private_data;
	239
	240	poll_wait(file, &list->hidraw->wait, wait);
	241	if (list->head != list->tail)
	242	return POLLIN \| POLLRDNORM;
	243	if (!list->hidraw->exist)
	244	return POLLERR \| POLLHUP;
	245	return 0;
	246	}
	247
	248	static int hidraw_open(struct inode inode, struct file file)
	249	{
	250	unsigned int minor = iminor(inode);
	251	struct hidraw *dev;
	252	struct hidraw_list *list;
	253	int err = 0;
	254
	255	if (!(list = kzalloc(sizeof(struct hidraw_list), GFP_KERNEL))) {
	256	err = -ENOMEM;
	257	goto out;
	258	}
	259
7d672cd7	260	mutex_lock(&minors_lock);
86166b7b	261	if (!hidraw_table[minor]) {
86166b7b JK	262	kfree(list);
	263	err = -ENODEV;
	264	goto out_unlock;
	265	}
	266
	267	list->hidraw = hidraw_table[minor];
	268	mutex_init(&list->read_mutex);
	269	list_add_tail(&list->node, &hidraw_table[minor]->list);
	270	file->private_data = list;
	271
	272	dev = hidraw_table[minor];
7d672cd7	273	if (!dev->open++) {
5bea7660 DT	274	err = hid_hw_power(dev->hid, PM_HINT_FULLON);
	275	if (err < 0)
	276	goto out_unlock;
	277
	278	err = hid_hw_open(dev->hid);
0361a28d	279	if (err < 0) {
5bea7660	280	hid_hw_power(dev->hid, PM_HINT_NORMAL);
7d672cd7	281	dev->open--;
0361a28d	282	}
7d672cd7	283	}
86166b7b JK	284
86166b7b JK	285	out_unlock:
7d672cd7	286	mutex_unlock(&minors_lock);
7d672cd7	287	out:
86166b7b JK	288	return err;
	289
	290	}
	291
	292	static int hidraw_release(struct inode * inode, struct file * file)
	293	{
	294	unsigned int minor = iminor(inode);
	295	struct hidraw *dev;
	296	struct hidraw_list *list = file->private_data;
cb174681	297	int ret;
86166b7b	298
cb174681 JS	299	mutex_lock(&minors_lock);
	300	if (!hidraw_table[minor]) {
	301	ret = -ENODEV;
	302	goto unlock;
	303	}
86166b7b JK	304
	305	list_del(&list->node);
	306	dev = hidraw_table[minor];
b8a832b1	307	if (!--dev->open) {
0361a28d	308	if (list->hidraw->exist) {
5bea7660 DT	309	hid_hw_power(dev->hid, PM_HINT_NORMAL);
5bea7660 DT	310	hid_hw_close(dev->hid);
0361a28d	311	} else {
86166b7b	312	kfree(list->hidraw);
0361a28d	313	}
86166b7b	314	}
4db1c62c	315	kfree(list);
cb174681 JS	316	ret = 0;
	317	unlock:
	318	mutex_unlock(&minors_lock);
4db1c62c	319
cb174681	320	return ret;
86166b7b JK	321	}
86166b7b JK	322
979c407e AC	323	static long hidraw_ioctl(struct file *file, unsigned int cmd,
979c407e AC	324	unsigned long arg)
86166b7b	325	{
979c407e	326	struct inode *inode = file->f_path.dentry->d_inode;
86166b7b	327	unsigned int minor = iminor(inode);
979c407e	328	long ret = 0;
2e57480b	329	struct hidraw *dev;
86166b7b JK	330	void __user user_arg = (void __user) arg;
86166b7b JK	331
2e57480b JK	332	mutex_lock(&minors_lock);
2e57480b JK	333	dev = hidraw_table[minor];
d20d5ffa AO	334	if (!dev) {
	335	ret = -ENODEV;
	336	goto out;
	337	}
2e57480b	338
86166b7b JK	339	switch (cmd) {
	340	case HIDIOCGRDESCSIZE:
	341	if (put_user(dev->hid->rsize, (int __user *)arg))
979c407e AC	342	ret = -EFAULT;
979c407e AC	343	break;
86166b7b JK	344
	345	case HIDIOCGRDESC:
	346	{
	347	__u32 len;
	348
	349	if (get_user(len, (int __user *)arg))
979c407e AC	350	ret = -EFAULT;
	351	else if (len > HID_MAX_DESCRIPTOR_SIZE - 1)
	352	ret = -EINVAL;
	353	else if (copy_to_user(user_arg + offsetof(
	354	struct hidraw_report_descriptor,
	355	value[0]),
	356	dev->hid->rdesc,
	357	min(dev->hid->rsize, len)))
	358	ret = -EFAULT;
	359	break;
86166b7b JK	360	}
	361	case HIDIOCGRAWINFO:
	362	{
	363	struct hidraw_devinfo dinfo;
	364
	365	dinfo.bustype = dev->hid->bus;
	366	dinfo.vendor = dev->hid->vendor;
	367	dinfo.product = dev->hid->product;
	368	if (copy_to_user(user_arg, &dinfo, sizeof(dinfo)))
979c407e AC	369	ret = -EFAULT;
979c407e AC	370	break;
86166b7b JK	371	}
86166b7b JK	372	default:
9188e79e JK	373	{
9188e79e JK	374	struct hid_device *hid = dev->hid;
b4dbde9d AO	375	if (_IOC_TYPE(cmd) != 'H') {
	376	ret = -EINVAL;
	377	break;
	378	}
	379
	380	if (_IOC_NR(cmd) == _IOC_NR(HIDIOCSFEATURE(0))) {
	381	int len = _IOC_SIZE(cmd);
	382	ret = hidraw_send_report(file, user_arg, len, HID_FEATURE_REPORT);
	383	break;
	384	}
	385	if (_IOC_NR(cmd) == _IOC_NR(HIDIOCGFEATURE(0))) {
	386	int len = _IOC_SIZE(cmd);
	387	ret = hidraw_get_report(file, user_arg, len, HID_FEATURE_REPORT);
	388	break;
	389	}
	390
	391	/* Begin Read-only ioctls. */
	392	if (_IOC_DIR(cmd) != _IOC_READ) {
dfd395af DC	393	ret = -EINVAL;
	394	break;
	395	}
9188e79e JK	396
9188e79e JK	397	if (_IOC_NR(cmd) == _IOC_NR(HIDIOCGRAWNAME(0))) {
dd2ed487	398	int len = strlen(hid->name) + 1;
9188e79e JK	399	if (len > _IOC_SIZE(cmd))
9188e79e JK	400	len = _IOC_SIZE(cmd);
dfd395af	401	ret = copy_to_user(user_arg, hid->name, len) ?
9188e79e	402	-EFAULT : len;
dfd395af	403	break;
9188e79e JK	404	}
	405
	406	if (_IOC_NR(cmd) == _IOC_NR(HIDIOCGRAWPHYS(0))) {
dd2ed487	407	int len = strlen(hid->phys) + 1;
9188e79e JK	408	if (len > _IOC_SIZE(cmd))
9188e79e JK	409	len = _IOC_SIZE(cmd);
dfd395af	410	ret = copy_to_user(user_arg, hid->phys, len) ?
9188e79e	411	-EFAULT : len;
dfd395af	412	break;
9188e79e	413	}
b4dbde9d	414	}
9188e79e	415
dfd395af	416	ret = -ENOTTY;
86166b7b	417	}
d20d5ffa	418	out:
2e57480b	419	mutex_unlock(&minors_lock);
979c407e	420	return ret;
86166b7b JK	421	}
	422
	423	static const struct file_operations hidraw_ops = {
	424	.owner = THIS_MODULE,
	425	.read = hidraw_read,
	426	.write = hidraw_write,
	427	.poll = hidraw_poll,
	428	.open = hidraw_open,
	429	.release = hidraw_release,
979c407e	430	.unlocked_ioctl = hidraw_ioctl,
ae5e49c7 AO	431	#ifdef CONFIG_COMPAT
	432	.compat_ioctl = hidraw_ioctl,
	433	#endif
6038f373	434	.llseek = noop_llseek,
86166b7b JK	435	};
	436
	437	void hidraw_report_event(struct hid_device hid, u8 data, int len)
	438	{
	439	struct hidraw *dev = hid->hidraw;
	440	struct hidraw_list *list;
	441
	442	list_for_each_entry(list, &dev->list, node) {
	443	list->buffer[list->head].value = kmemdup(data, len, GFP_ATOMIC);
	444	list->buffer[list->head].len = len;
	445	list->head = (list->head + 1) & (HIDRAW_BUFFER_SIZE - 1);
	446	kill_fasync(&list->fasync, SIGIO, POLL_IN);
	447	}
	448
	449	wake_up_interruptible(&dev->wait);
	450	}
	451	EXPORT_SYMBOL_GPL(hidraw_report_event);
	452
	453	int hidraw_connect(struct hid_device *hid)
	454	{
709d27c0	455	int minor, result;
86166b7b JK	456	struct hidraw *dev;
86166b7b JK	457
bbe281fa	458	/* we accept any HID device, no matter the applications */
86166b7b	459
709d27c0 MK	460	dev = kzalloc(sizeof(struct hidraw), GFP_KERNEL);
	461	if (!dev)
	462	return -ENOMEM;
	463
	464	result = -EINVAL;
86166b7b	465
7d672cd7	466	mutex_lock(&minors_lock);
86166b7b JK	467
	468	for (minor = 0; minor < HIDRAW_MAX_DEVICES; minor++) {
	469	if (hidraw_table[minor])
	470	continue;
	471	hidraw_table[minor] = dev;
	472	result = 0;
	473	break;
	474	}
	475
709d27c0	476	if (result) {
7d672cd7	477	mutex_unlock(&minors_lock);
709d27c0	478	kfree(dev);
86166b7b	479	goto out;
709d27c0	480	}
86166b7b	481
aae6c286	482	dev->dev = device_create(hidraw_class, &hid->dev, MKDEV(hidraw_major, minor),
a9b12619	483	NULL, "%s%d", "hidraw", minor);
86166b7b JK	484
86166b7b JK	485	if (IS_ERR(dev->dev)) {
86166b7b	486	hidraw_table[minor] = NULL;
7d672cd7	487	mutex_unlock(&minors_lock);
86166b7b	488	result = PTR_ERR(dev->dev);
709d27c0	489	kfree(dev);
86166b7b JK	490	goto out;
	491	}
	492
7d672cd7	493	mutex_unlock(&minors_lock);
86166b7b JK	494	init_waitqueue_head(&dev->wait);
	495	INIT_LIST_HEAD(&dev->list);
	496
	497	dev->hid = hid;
	498	dev->minor = minor;
	499
	500	dev->exist = 1;
	501	hid->hidraw = dev;
	502
	503	out:
	504	return result;
	505
	506	}
	507	EXPORT_SYMBOL_GPL(hidraw_connect);
	508
	509	void hidraw_disconnect(struct hid_device *hid)
	510	{
	511	struct hidraw *hidraw = hid->hidraw;
	512
	513	hidraw->exist = 0;
	514
3a22ebe9 SA	515	device_destroy(hidraw_class, MKDEV(hidraw_major, hidraw->minor));
3a22ebe9 SA	516
7d672cd7	517	mutex_lock(&minors_lock);
86166b7b	518	hidraw_table[hidraw->minor] = NULL;
7d672cd7	519	mutex_unlock(&minors_lock);
86166b7b	520
86166b7b	521	if (hidraw->open) {
5bea7660	522	hid_hw_close(hid);
86166b7b JK	523	wake_up_interruptible(&hidraw->wait);
	524	} else {
	525	kfree(hidraw);
	526	}
	527	}
	528	EXPORT_SYMBOL_GPL(hidraw_disconnect);
	529
	530	int __init hidraw_init(void)
	531	{
	532	int result;
	533	dev_t dev_id;
	534
	535	result = alloc_chrdev_region(&dev_id, HIDRAW_FIRST_MINOR,
	536	HIDRAW_MAX_DEVICES, "hidraw");
	537
	538	hidraw_major = MAJOR(dev_id);
	539
	540	if (result < 0) {
4291ee30	541	pr_warn("can't get major number\n");
86166b7b JK	542	result = 0;
	543	goto out;
	544	}
	545
	546	hidraw_class = class_create(THIS_MODULE, "hidraw");
	547	if (IS_ERR(hidraw_class)) {
	548	result = PTR_ERR(hidraw_class);
	549	unregister_chrdev(hidraw_major, "hidraw");
	550	goto out;
	551	}
	552
	553	cdev_init(&hidraw_cdev, &hidraw_ops);
	554	cdev_add(&hidraw_cdev, dev_id, HIDRAW_MAX_DEVICES);
	555	out:
	556	return result;
	557	}
	558
140ae3eb	559	void hidraw_exit(void)
86166b7b JK	560	{
	561	dev_t dev_id = MKDEV(hidraw_major, 0);
	562
	563	cdev_del(&hidraw_cdev);
	564	class_destroy(hidraw_class);
	565	unregister_chrdev_region(dev_id, HIDRAW_MAX_DEVICES);
	566
	567	}