[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.
 */

#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 (list->buffer[list->tail].value) {
			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]) {
		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) {
			dev->open--;
			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:
	if (err < 0)
		kfree(list);
	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,
};

int hidraw_report_event(struct hid_device *hid, u8 *data, int len)
{
	struct hidraw *dev = hid->hidraw;
	struct hidraw_list *list;
	int ret = 0;

	list_for_each_entry(list, &dev->list, node) {
		if (!(list->buffer[list->head].value = kmemdup(data, len, GFP_ATOMIC))) {
			ret = -ENOMEM;
			break;
		}
		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);
	return ret;
}
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;

	mutex_lock(&minors_lock);
	hidraw->exist = 0;

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

	hidraw_table[hidraw->minor] = NULL;

	if (hidraw->open) {
		hid_hw_close(hid);
		wake_up_interruptible(&hidraw->wait);
	} else {
		kfree(hidraw);
	}
	mutex_unlock(&minors_lock);
}
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
b6787242 JK	90	if (list->buffer[list->tail].value) {
	91	if (copy_to_user(buffer, list->buffer[list->tail].value, len)) {
	92	ret = -EFAULT;
	93	goto out;
	94	}
	95	ret = len;
86166b7b	96	}
86166b7b JK	97
	98	kfree(list->buffer[list->tail].value);
	99	list->tail = (list->tail + 1) & (HIDRAW_BUFFER_SIZE - 1);
	100	}
	101	out:
	102	mutex_unlock(&list->read_mutex);
	103	return ret;
	104	}
	105
d2a1cfeb JK	106	/* The first byte is expected to be a report number.
d2a1cfeb JK	107	* This function is to be called with the minors_lock mutex held */
b4dbde9d	108	static ssize_t hidraw_send_report(struct file file, const char __user buffer, size_t count, unsigned char report_type)
86166b7b JK	109	{
86166b7b JK	110	unsigned int minor = iminor(file->f_path.dentry->d_inode);
2e57480b	111	struct hid_device *dev;
86166b7b JK	112	__u8 *buf;
	113	int ret = 0;
	114
e42dee9a AO	115	if (!hidraw_table[minor]) {
	116	ret = -ENODEV;
	117	goto out;
	118	}
	119
2e57480b JK	120	dev = hidraw_table[minor]->hid;
	121
	122	if (!dev->hid_output_raw_report) {
	123	ret = -ENODEV;
	124	goto out;
	125	}
86166b7b	126
2b107d62	127	if (count > HID_MAX_BUFFER_SIZE) {
4291ee30 JP	128	hid_warn(dev, "pid %d passed too large report\n",
4291ee30 JP	129	task_pid_nr(current));
2e57480b JK	130	ret = -EINVAL;
2e57480b JK	131	goto out;
86166b7b JK	132	}
	133
	134	if (count < 2) {
4291ee30 JP	135	hid_warn(dev, "pid %d passed too short report\n",
4291ee30 JP	136	task_pid_nr(current));
2e57480b JK	137	ret = -EINVAL;
2e57480b JK	138	goto out;
86166b7b JK	139	}
	140
	141	buf = kmalloc(count * sizeof(__u8), GFP_KERNEL);
2e57480b JK	142	if (!buf) {
	143	ret = -ENOMEM;
	144	goto out;
	145	}
86166b7b JK	146
	147	if (copy_from_user(buf, buffer, count)) {
	148	ret = -EFAULT;
2e57480b	149	goto out_free;
86166b7b JK	150	}
86166b7b JK	151
b4dbde9d	152	ret = dev->hid_output_raw_report(dev, buf, count, report_type);
2e57480b	153	out_free:
86166b7b	154	kfree(buf);
2e57480b	155	out:
b4dbde9d AO	156	return ret;
	157	}
	158
	159	/* the first byte is expected to be a report number */
	160	static ssize_t hidraw_write(struct file file, const char __user buffer, size_t count, loff_t *ppos)
	161	{
	162	ssize_t ret;
	163	mutex_lock(&minors_lock);
	164	ret = hidraw_send_report(file, buffer, count, HID_OUTPUT_REPORT);
2e57480b	165	mutex_unlock(&minors_lock);
86166b7b JK	166	return ret;
	167	}
	168
b4dbde9d AO	169
b4dbde9d AO	170	/* This function performs a Get_Report transfer over the control endpoint
d2a1cfeb JK	171	* per section 7.2.1 of the HID specification, version 1.1. The first byte
	172	* of buffer is the report number to request, or 0x0 if the defice does not
	173	* use numbered reports. The report_type parameter can be HID_FEATURE_REPORT
	174	* or HID_INPUT_REPORT. This function is to be called with the minors_lock
	175	* mutex held. */
b4dbde9d AO	176	static ssize_t hidraw_get_report(struct file file, char __user buffer, size_t count, unsigned char report_type)
	177	{
	178	unsigned int minor = iminor(file->f_path.dentry->d_inode);
	179	struct hid_device *dev;
	180	__u8 *buf;
	181	int ret = 0, len;
	182	unsigned char report_number;
	183
	184	dev = hidraw_table[minor]->hid;
	185
	186	if (!dev->hid_get_raw_report) {
	187	ret = -ENODEV;
	188	goto out;
	189	}
	190
	191	if (count > HID_MAX_BUFFER_SIZE) {
	192	printk(KERN_WARNING "hidraw: pid %d passed too large report\n",
	193	task_pid_nr(current));
	194	ret = -EINVAL;
	195	goto out;
	196	}
	197
	198	if (count < 2) {
	199	printk(KERN_WARNING "hidraw: pid %d passed too short report\n",
	200	task_pid_nr(current));
	201	ret = -EINVAL;
	202	goto out;
	203	}
	204
	205	buf = kmalloc(count * sizeof(__u8), GFP_KERNEL);
	206	if (!buf) {
	207	ret = -ENOMEM;
	208	goto out;
	209	}
	210
	211	/* Read the first byte from the user. This is the report number,
d2a1cfeb	212	* which is passed to dev->hid_get_raw_report(). */
b4dbde9d AO	213	if (copy_from_user(&report_number, buffer, 1)) {
	214	ret = -EFAULT;
	215	goto out_free;
	216	}
	217
	218	ret = dev->hid_get_raw_report(dev, report_number, buf, count, report_type);
	219
	220	if (ret < 0)
	221	goto out_free;
	222
	223	len = (ret < count) ? ret : count;
	224
	225	if (copy_to_user(buffer, buf, len)) {
	226	ret = -EFAULT;
	227	goto out_free;
	228	}
	229
	230	ret = len;
	231
	232	out_free:
	233	kfree(buf);
	234	out:
	235	return ret;
	236	}
	237
86166b7b JK	238	static unsigned int hidraw_poll(struct file file, poll_table wait)
	239	{
	240	struct hidraw_list *list = file->private_data;
	241
	242	poll_wait(file, &list->hidraw->wait, wait);
	243	if (list->head != list->tail)
	244	return POLLIN \| POLLRDNORM;
	245	if (!list->hidraw->exist)
	246	return POLLERR \| POLLHUP;
	247	return 0;
	248	}
	249
	250	static int hidraw_open(struct inode inode, struct file file)
	251	{
	252	unsigned int minor = iminor(inode);
	253	struct hidraw *dev;
	254	struct hidraw_list *list;
	255	int err = 0;
	256
	257	if (!(list = kzalloc(sizeof(struct hidraw_list), GFP_KERNEL))) {
	258	err = -ENOMEM;
	259	goto out;
	260	}
	261
7d672cd7	262	mutex_lock(&minors_lock);
86166b7b	263	if (!hidraw_table[minor]) {
86166b7b JK	264	err = -ENODEV;
	265	goto out_unlock;
	266	}
	267
	268	list->hidraw = hidraw_table[minor];
	269	mutex_init(&list->read_mutex);
	270	list_add_tail(&list->node, &hidraw_table[minor]->list);
	271	file->private_data = list;
	272
	273	dev = hidraw_table[minor];
7d672cd7	274	if (!dev->open++) {
5bea7660	275	err = hid_hw_power(dev->hid, PM_HINT_FULLON);
f554ff80 AN	276	if (err < 0) {
f554ff80 AN	277	dev->open--;
5bea7660	278	goto out_unlock;
f554ff80	279	}
5bea7660 DT	280
5bea7660 DT	281	err = hid_hw_open(dev->hid);
0361a28d	282	if (err < 0) {
5bea7660	283	hid_hw_power(dev->hid, PM_HINT_NORMAL);
7d672cd7	284	dev->open--;
0361a28d	285	}
7d672cd7	286	}
86166b7b JK	287
86166b7b JK	288	out_unlock:
7d672cd7	289	mutex_unlock(&minors_lock);
7d672cd7	290	out:
1a896231 AN	291	if (err < 0)
1a896231 AN	292	kfree(list);
86166b7b JK	293	return err;
	294
	295	}
	296
	297	static int hidraw_release(struct inode * inode, struct file * file)
	298	{
	299	unsigned int minor = iminor(inode);
	300	struct hidraw *dev;
	301	struct hidraw_list *list = file->private_data;
cb174681	302	int ret;
86166b7b	303
cb174681 JS	304	mutex_lock(&minors_lock);
	305	if (!hidraw_table[minor]) {
	306	ret = -ENODEV;
	307	goto unlock;
	308	}
86166b7b JK	309
	310	list_del(&list->node);
	311	dev = hidraw_table[minor];
b8a832b1	312	if (!--dev->open) {
0361a28d	313	if (list->hidraw->exist) {
5bea7660 DT	314	hid_hw_power(dev->hid, PM_HINT_NORMAL);
5bea7660 DT	315	hid_hw_close(dev->hid);
0361a28d	316	} else {
86166b7b	317	kfree(list->hidraw);
0361a28d	318	}
86166b7b	319	}
4db1c62c	320	kfree(list);
cb174681 JS	321	ret = 0;
	322	unlock:
	323	mutex_unlock(&minors_lock);
4db1c62c	324
cb174681	325	return ret;
86166b7b JK	326	}
86166b7b JK	327
979c407e AC	328	static long hidraw_ioctl(struct file *file, unsigned int cmd,
979c407e AC	329	unsigned long arg)
86166b7b	330	{
979c407e	331	struct inode *inode = file->f_path.dentry->d_inode;
86166b7b	332	unsigned int minor = iminor(inode);
979c407e	333	long ret = 0;
2e57480b	334	struct hidraw *dev;
86166b7b JK	335	void __user user_arg = (void __user) arg;
86166b7b JK	336
2e57480b JK	337	mutex_lock(&minors_lock);
2e57480b JK	338	dev = hidraw_table[minor];
d20d5ffa AO	339	if (!dev) {
	340	ret = -ENODEV;
	341	goto out;
	342	}
2e57480b	343
86166b7b JK	344	switch (cmd) {
	345	case HIDIOCGRDESCSIZE:
	346	if (put_user(dev->hid->rsize, (int __user *)arg))
979c407e AC	347	ret = -EFAULT;
979c407e AC	348	break;
86166b7b JK	349
	350	case HIDIOCGRDESC:
	351	{
	352	__u32 len;
	353
	354	if (get_user(len, (int __user *)arg))
979c407e AC	355	ret = -EFAULT;
	356	else if (len > HID_MAX_DESCRIPTOR_SIZE - 1)
	357	ret = -EINVAL;
	358	else if (copy_to_user(user_arg + offsetof(
	359	struct hidraw_report_descriptor,
	360	value[0]),
	361	dev->hid->rdesc,
	362	min(dev->hid->rsize, len)))
	363	ret = -EFAULT;
	364	break;
86166b7b JK	365	}
	366	case HIDIOCGRAWINFO:
	367	{
	368	struct hidraw_devinfo dinfo;
	369
	370	dinfo.bustype = dev->hid->bus;
	371	dinfo.vendor = dev->hid->vendor;
	372	dinfo.product = dev->hid->product;
	373	if (copy_to_user(user_arg, &dinfo, sizeof(dinfo)))
979c407e AC	374	ret = -EFAULT;
979c407e AC	375	break;
86166b7b JK	376	}
86166b7b JK	377	default:
9188e79e JK	378	{
9188e79e JK	379	struct hid_device *hid = dev->hid;
b4dbde9d AO	380	if (_IOC_TYPE(cmd) != 'H') {
	381	ret = -EINVAL;
	382	break;
	383	}
	384
	385	if (_IOC_NR(cmd) == _IOC_NR(HIDIOCSFEATURE(0))) {
	386	int len = _IOC_SIZE(cmd);
	387	ret = hidraw_send_report(file, user_arg, len, HID_FEATURE_REPORT);
	388	break;
	389	}
	390	if (_IOC_NR(cmd) == _IOC_NR(HIDIOCGFEATURE(0))) {
	391	int len = _IOC_SIZE(cmd);
	392	ret = hidraw_get_report(file, user_arg, len, HID_FEATURE_REPORT);
	393	break;
	394	}
	395
	396	/* Begin Read-only ioctls. */
	397	if (_IOC_DIR(cmd) != _IOC_READ) {
dfd395af DC	398	ret = -EINVAL;
	399	break;
	400	}
9188e79e JK	401
9188e79e JK	402	if (_IOC_NR(cmd) == _IOC_NR(HIDIOCGRAWNAME(0))) {
dd2ed487	403	int len = strlen(hid->name) + 1;
9188e79e JK	404	if (len > _IOC_SIZE(cmd))
9188e79e JK	405	len = _IOC_SIZE(cmd);
dfd395af	406	ret = copy_to_user(user_arg, hid->name, len) ?
9188e79e	407	-EFAULT : len;
dfd395af	408	break;
9188e79e JK	409	}
	410
	411	if (_IOC_NR(cmd) == _IOC_NR(HIDIOCGRAWPHYS(0))) {
dd2ed487	412	int len = strlen(hid->phys) + 1;
9188e79e JK	413	if (len > _IOC_SIZE(cmd))
9188e79e JK	414	len = _IOC_SIZE(cmd);
dfd395af	415	ret = copy_to_user(user_arg, hid->phys, len) ?
9188e79e	416	-EFAULT : len;
dfd395af	417	break;
9188e79e	418	}
b4dbde9d	419	}
9188e79e	420
dfd395af	421	ret = -ENOTTY;
86166b7b	422	}
d20d5ffa	423	out:
2e57480b	424	mutex_unlock(&minors_lock);
979c407e	425	return ret;
86166b7b JK	426	}
	427
	428	static const struct file_operations hidraw_ops = {
	429	.owner = THIS_MODULE,
	430	.read = hidraw_read,
	431	.write = hidraw_write,
	432	.poll = hidraw_poll,
	433	.open = hidraw_open,
	434	.release = hidraw_release,
979c407e	435	.unlocked_ioctl = hidraw_ioctl,
ae5e49c7 AO	436	#ifdef CONFIG_COMPAT
	437	.compat_ioctl = hidraw_ioctl,
	438	#endif
6038f373	439	.llseek = noop_llseek,
86166b7b JK	440	};
86166b7b JK	441
b6787242	442	int hidraw_report_event(struct hid_device hid, u8 data, int len)
86166b7b JK	443	{
	444	struct hidraw *dev = hid->hidraw;
	445	struct hidraw_list *list;
b6787242	446	int ret = 0;
86166b7b JK	447
86166b7b JK	448	list_for_each_entry(list, &dev->list, node) {
b6787242 JK	449	if (!(list->buffer[list->head].value = kmemdup(data, len, GFP_ATOMIC))) {
	450	ret = -ENOMEM;
	451	break;
	452	}
86166b7b JK	453	list->buffer[list->head].len = len;
	454	list->head = (list->head + 1) & (HIDRAW_BUFFER_SIZE - 1);
	455	kill_fasync(&list->fasync, SIGIO, POLL_IN);
	456	}
	457
	458	wake_up_interruptible(&dev->wait);
b6787242	459	return ret;
86166b7b JK	460	}
	461	EXPORT_SYMBOL_GPL(hidraw_report_event);
	462
	463	int hidraw_connect(struct hid_device *hid)
	464	{
709d27c0	465	int minor, result;
86166b7b JK	466	struct hidraw *dev;
86166b7b JK	467
bbe281fa	468	/* we accept any HID device, no matter the applications */
86166b7b	469
709d27c0 MK	470	dev = kzalloc(sizeof(struct hidraw), GFP_KERNEL);
	471	if (!dev)
	472	return -ENOMEM;
	473
	474	result = -EINVAL;
86166b7b	475
7d672cd7	476	mutex_lock(&minors_lock);
86166b7b JK	477
	478	for (minor = 0; minor < HIDRAW_MAX_DEVICES; minor++) {
	479	if (hidraw_table[minor])
	480	continue;
	481	hidraw_table[minor] = dev;
	482	result = 0;
	483	break;
	484	}
	485
709d27c0	486	if (result) {
7d672cd7	487	mutex_unlock(&minors_lock);
709d27c0	488	kfree(dev);
86166b7b	489	goto out;
709d27c0	490	}
86166b7b	491
aae6c286	492	dev->dev = device_create(hidraw_class, &hid->dev, MKDEV(hidraw_major, minor),
a9b12619	493	NULL, "%s%d", "hidraw", minor);
86166b7b JK	494
86166b7b JK	495	if (IS_ERR(dev->dev)) {
86166b7b	496	hidraw_table[minor] = NULL;
7d672cd7	497	mutex_unlock(&minors_lock);
86166b7b	498	result = PTR_ERR(dev->dev);
709d27c0	499	kfree(dev);
86166b7b JK	500	goto out;
	501	}
	502
7d672cd7	503	mutex_unlock(&minors_lock);
86166b7b JK	504	init_waitqueue_head(&dev->wait);
	505	INIT_LIST_HEAD(&dev->list);
	506
	507	dev->hid = hid;
	508	dev->minor = minor;
	509
	510	dev->exist = 1;
	511	hid->hidraw = dev;
	512
	513	out:
	514	return result;
	515
	516	}
	517	EXPORT_SYMBOL_GPL(hidraw_connect);
	518
	519	void hidraw_disconnect(struct hid_device *hid)
	520	{
	521	struct hidraw *hidraw = hid->hidraw;
	522
65b01bd5	523	mutex_lock(&minors_lock);
86166b7b JK	524	hidraw->exist = 0;
86166b7b JK	525
3a22ebe9 SA	526	device_destroy(hidraw_class, MKDEV(hidraw_major, hidraw->minor));
3a22ebe9 SA	527
86166b7b	528	hidraw_table[hidraw->minor] = NULL;
86166b7b	529
86166b7b	530	if (hidraw->open) {
5bea7660	531	hid_hw_close(hid);
86166b7b JK	532	wake_up_interruptible(&hidraw->wait);
	533	} else {
	534	kfree(hidraw);
	535	}
65b01bd5	536	mutex_unlock(&minors_lock);
86166b7b JK	537	}
	538	EXPORT_SYMBOL_GPL(hidraw_disconnect);
	539
	540	int __init hidraw_init(void)
	541	{
	542	int result;
	543	dev_t dev_id;
	544
	545	result = alloc_chrdev_region(&dev_id, HIDRAW_FIRST_MINOR,
	546	HIDRAW_MAX_DEVICES, "hidraw");
	547
	548	hidraw_major = MAJOR(dev_id);
	549
	550	if (result < 0) {
4291ee30	551	pr_warn("can't get major number\n");
86166b7b JK	552	result = 0;
	553	goto out;
	554	}
	555
	556	hidraw_class = class_create(THIS_MODULE, "hidraw");
	557	if (IS_ERR(hidraw_class)) {
	558	result = PTR_ERR(hidraw_class);
	559	unregister_chrdev(hidraw_major, "hidraw");
	560	goto out;
	561	}
	562
	563	cdev_init(&hidraw_cdev, &hidraw_ops);
	564	cdev_add(&hidraw_cdev, dev_id, HIDRAW_MAX_DEVICES);
	565	out:
	566	return result;
	567	}
	568
140ae3eb	569	void hidraw_exit(void)
86166b7b JK	570	{
	571	dev_t dev_id = MKDEV(hidraw_major, 0);
	572
	573	cdev_del(&hidraw_cdev);
	574	class_destroy(hidraw_class);
	575	unregister_chrdev_region(dev_id, HIDRAW_MAX_DEVICES);
	576
	577	}