[GitHub/mt8127/android_kernel_alcatel_ttab.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/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);

	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>
702e57d9	37	#include <linux/smp_lock.h>
86166b7b JK	38
	39	#include <linux/hidraw.h>
	40
	41	static int hidraw_major;
	42	static struct cdev hidraw_cdev;
	43	static struct class *hidraw_class;
	44	static struct hidraw *hidraw_table[HIDRAW_MAX_DEVICES];
7d672cd7	45	static DEFINE_MUTEX(minors_lock);
86166b7b JK	46
	47	static ssize_t hidraw_read(struct file file, char __user buffer, size_t count, loff_t *ppos)
	48	{
	49	struct hidraw_list *list = file->private_data;
	50	int ret = 0, len;
86166b7b JK	51	DECLARE_WAITQUEUE(wait, current);
86166b7b JK	52
b0e14951	53	mutex_lock(&list->read_mutex);
86166b7b	54
b0e14951	55	while (ret == 0) {
86166b7b JK	56	if (list->head == list->tail) {
	57	add_wait_queue(&list->hidraw->wait, &wait);
	58	set_current_state(TASK_INTERRUPTIBLE);
	59
	60	while (list->head == list->tail) {
	61	if (file->f_flags & O_NONBLOCK) {
	62	ret = -EAGAIN;
	63	break;
	64	}
	65	if (signal_pending(current)) {
	66	ret = -ERESTARTSYS;
	67	break;
	68	}
	69	if (!list->hidraw->exist) {
	70	ret = -EIO;
	71	break;
	72	}
	73
	74	/* allow O_NONBLOCK to work well from other threads */
	75	mutex_unlock(&list->read_mutex);
	76	schedule();
	77	mutex_lock(&list->read_mutex);
	78	set_current_state(TASK_INTERRUPTIBLE);
	79	}
	80
	81	set_current_state(TASK_RUNNING);
	82	remove_wait_queue(&list->hidraw->wait, &wait);
	83	}
	84
	85	if (ret)
	86	goto out;
	87
86166b7b JK	88	len = list->buffer[list->tail].len > count ?
	89	count : list->buffer[list->tail].len;
	90
	91	if (copy_to_user(buffer, list->buffer[list->tail].value, len)) {
	92	ret = -EFAULT;
	93	goto out;
	94	}
	95	ret += len;
	96
	97	kfree(list->buffer[list->tail].value);
	98	list->tail = (list->tail + 1) & (HIDRAW_BUFFER_SIZE - 1);
	99	}
	100	out:
	101	mutex_unlock(&list->read_mutex);
	102	return ret;
	103	}
	104
	105	/* the first byte is expected to be a report number */
	106	static ssize_t hidraw_write(struct file file, const char __user buffer, size_t count, loff_t *ppos)
	107	{
	108	unsigned int minor = iminor(file->f_path.dentry->d_inode);
2e57480b	109	struct hid_device *dev;
86166b7b JK	110	__u8 *buf;
	111	int ret = 0;
	112
2e57480b	113	mutex_lock(&minors_lock);
e42dee9a AO	114
	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
d4bfa033	152	ret = dev->hid_output_raw_report(dev, buf, count, HID_OUTPUT_REPORT);
2e57480b	153	out_free:
86166b7b	154	kfree(buf);
2e57480b JK	155	out:
2e57480b JK	156	mutex_unlock(&minors_lock);
86166b7b JK	157	return ret;
	158	}
	159
	160	static unsigned int hidraw_poll(struct file file, poll_table wait)
	161	{
	162	struct hidraw_list *list = file->private_data;
	163
	164	poll_wait(file, &list->hidraw->wait, wait);
	165	if (list->head != list->tail)
	166	return POLLIN \| POLLRDNORM;
	167	if (!list->hidraw->exist)
	168	return POLLERR \| POLLHUP;
	169	return 0;
	170	}
	171
	172	static int hidraw_open(struct inode inode, struct file file)
	173	{
	174	unsigned int minor = iminor(inode);
	175	struct hidraw *dev;
	176	struct hidraw_list *list;
	177	int err = 0;
	178
	179	if (!(list = kzalloc(sizeof(struct hidraw_list), GFP_KERNEL))) {
	180	err = -ENOMEM;
	181	goto out;
	182	}
	183
7d672cd7	184	mutex_lock(&minors_lock);
86166b7b	185	if (!hidraw_table[minor]) {
86166b7b JK	186	kfree(list);
	187	err = -ENODEV;
	188	goto out_unlock;
	189	}
	190
	191	list->hidraw = hidraw_table[minor];
	192	mutex_init(&list->read_mutex);
	193	list_add_tail(&list->node, &hidraw_table[minor]->list);
	194	file->private_data = list;
	195
	196	dev = hidraw_table[minor];
7d672cd7	197	if (!dev->open++) {
5bea7660 DT	198	err = hid_hw_power(dev->hid, PM_HINT_FULLON);
	199	if (err < 0)
	200	goto out_unlock;
	201
	202	err = hid_hw_open(dev->hid);
0361a28d	203	if (err < 0) {
5bea7660	204	hid_hw_power(dev->hid, PM_HINT_NORMAL);
7d672cd7	205	dev->open--;
0361a28d	206	}
7d672cd7	207	}
86166b7b JK	208
86166b7b JK	209	out_unlock:
7d672cd7	210	mutex_unlock(&minors_lock);
7d672cd7	211	out:
86166b7b JK	212	return err;
	213
	214	}
	215
	216	static int hidraw_release(struct inode * inode, struct file * file)
	217	{
	218	unsigned int minor = iminor(inode);
	219	struct hidraw *dev;
	220	struct hidraw_list *list = file->private_data;
cb174681	221	int ret;
86166b7b	222
cb174681 JS	223	mutex_lock(&minors_lock);
	224	if (!hidraw_table[minor]) {
	225	ret = -ENODEV;
	226	goto unlock;
	227	}
86166b7b JK	228
	229	list_del(&list->node);
	230	dev = hidraw_table[minor];
b8a832b1	231	if (!--dev->open) {
0361a28d	232	if (list->hidraw->exist) {
5bea7660 DT	233	hid_hw_power(dev->hid, PM_HINT_NORMAL);
5bea7660 DT	234	hid_hw_close(dev->hid);
0361a28d	235	} else {
86166b7b	236	kfree(list->hidraw);
0361a28d	237	}
86166b7b	238	}
4db1c62c	239	kfree(list);
cb174681 JS	240	ret = 0;
	241	unlock:
	242	mutex_unlock(&minors_lock);
4db1c62c	243
cb174681	244	return ret;
86166b7b JK	245	}
86166b7b JK	246
979c407e AC	247	static long hidraw_ioctl(struct file *file, unsigned int cmd,
979c407e AC	248	unsigned long arg)
86166b7b	249	{
979c407e	250	struct inode *inode = file->f_path.dentry->d_inode;
86166b7b	251	unsigned int minor = iminor(inode);
979c407e	252	long ret = 0;
2e57480b	253	struct hidraw *dev;
86166b7b JK	254	void __user user_arg = (void __user) arg;
86166b7b JK	255
2e57480b JK	256	mutex_lock(&minors_lock);
2e57480b JK	257	dev = hidraw_table[minor];
d20d5ffa AO	258	if (!dev) {
	259	ret = -ENODEV;
	260	goto out;
	261	}
2e57480b	262
86166b7b JK	263	switch (cmd) {
	264	case HIDIOCGRDESCSIZE:
	265	if (put_user(dev->hid->rsize, (int __user *)arg))
979c407e AC	266	ret = -EFAULT;
979c407e AC	267	break;
86166b7b JK	268
	269	case HIDIOCGRDESC:
	270	{
	271	__u32 len;
	272
	273	if (get_user(len, (int __user *)arg))
979c407e AC	274	ret = -EFAULT;
	275	else if (len > HID_MAX_DESCRIPTOR_SIZE - 1)
	276	ret = -EINVAL;
	277	else if (copy_to_user(user_arg + offsetof(
	278	struct hidraw_report_descriptor,
	279	value[0]),
	280	dev->hid->rdesc,
	281	min(dev->hid->rsize, len)))
	282	ret = -EFAULT;
	283	break;
86166b7b JK	284	}
	285	case HIDIOCGRAWINFO:
	286	{
	287	struct hidraw_devinfo dinfo;
	288
	289	dinfo.bustype = dev->hid->bus;
	290	dinfo.vendor = dev->hid->vendor;
	291	dinfo.product = dev->hid->product;
	292	if (copy_to_user(user_arg, &dinfo, sizeof(dinfo)))
979c407e AC	293	ret = -EFAULT;
979c407e AC	294	break;
86166b7b JK	295	}
86166b7b JK	296	default:
9188e79e JK	297	{
9188e79e JK	298	struct hid_device *hid = dev->hid;
dfd395af DC	299	if (_IOC_TYPE(cmd) != 'H' \|\| _IOC_DIR(cmd) != _IOC_READ) {
	300	ret = -EINVAL;
	301	break;
	302	}
9188e79e JK	303
	304	if (_IOC_NR(cmd) == _IOC_NR(HIDIOCGRAWNAME(0))) {
	305	int len;
38089c65 DC	306	if (!hid->name) {
	307	ret = 0;
	308	break;
	309	}
9188e79e JK	310	len = strlen(hid->name) + 1;
	311	if (len > _IOC_SIZE(cmd))
	312	len = _IOC_SIZE(cmd);
dfd395af	313	ret = copy_to_user(user_arg, hid->name, len) ?
9188e79e	314	-EFAULT : len;
dfd395af	315	break;
9188e79e JK	316	}
	317
	318	if (_IOC_NR(cmd) == _IOC_NR(HIDIOCGRAWPHYS(0))) {
	319	int len;
38089c65 DC	320	if (!hid->phys) {
	321	ret = 0;
	322	break;
	323	}
9188e79e JK	324	len = strlen(hid->phys) + 1;
	325	if (len > _IOC_SIZE(cmd))
	326	len = _IOC_SIZE(cmd);
dfd395af	327	ret = copy_to_user(user_arg, hid->phys, len) ?
9188e79e	328	-EFAULT : len;
dfd395af	329	break;
9188e79e	330	}
81cd5843	331	}
9188e79e	332
dfd395af	333	ret = -ENOTTY;
86166b7b	334	}
d20d5ffa	335	out:
2e57480b	336	mutex_unlock(&minors_lock);
979c407e	337	return ret;
86166b7b JK	338	}
	339
	340	static const struct file_operations hidraw_ops = {
	341	.owner = THIS_MODULE,
	342	.read = hidraw_read,
	343	.write = hidraw_write,
	344	.poll = hidraw_poll,
	345	.open = hidraw_open,
	346	.release = hidraw_release,
979c407e	347	.unlocked_ioctl = hidraw_ioctl,
6038f373	348	.llseek = noop_llseek,
86166b7b JK	349	};
	350
	351	void hidraw_report_event(struct hid_device hid, u8 data, int len)
	352	{
	353	struct hidraw *dev = hid->hidraw;
	354	struct hidraw_list *list;
	355
	356	list_for_each_entry(list, &dev->list, node) {
	357	list->buffer[list->head].value = kmemdup(data, len, GFP_ATOMIC);
	358	list->buffer[list->head].len = len;
	359	list->head = (list->head + 1) & (HIDRAW_BUFFER_SIZE - 1);
	360	kill_fasync(&list->fasync, SIGIO, POLL_IN);
	361	}
	362
	363	wake_up_interruptible(&dev->wait);
	364	}
	365	EXPORT_SYMBOL_GPL(hidraw_report_event);
	366
	367	int hidraw_connect(struct hid_device *hid)
	368	{
709d27c0	369	int minor, result;
86166b7b JK	370	struct hidraw *dev;
86166b7b JK	371
bbe281fa	372	/* we accept any HID device, no matter the applications */
86166b7b	373
709d27c0 MK	374	dev = kzalloc(sizeof(struct hidraw), GFP_KERNEL);
	375	if (!dev)
	376	return -ENOMEM;
	377
	378	result = -EINVAL;
86166b7b	379
7d672cd7	380	mutex_lock(&minors_lock);
86166b7b JK	381
	382	for (minor = 0; minor < HIDRAW_MAX_DEVICES; minor++) {
	383	if (hidraw_table[minor])
	384	continue;
	385	hidraw_table[minor] = dev;
	386	result = 0;
	387	break;
	388	}
	389
709d27c0	390	if (result) {
7d672cd7	391	mutex_unlock(&minors_lock);
709d27c0	392	kfree(dev);
86166b7b	393	goto out;
709d27c0	394	}
86166b7b	395
aae6c286	396	dev->dev = device_create(hidraw_class, &hid->dev, MKDEV(hidraw_major, minor),
a9b12619	397	NULL, "%s%d", "hidraw", minor);
86166b7b JK	398
86166b7b JK	399	if (IS_ERR(dev->dev)) {
86166b7b	400	hidraw_table[minor] = NULL;
7d672cd7	401	mutex_unlock(&minors_lock);
86166b7b	402	result = PTR_ERR(dev->dev);
709d27c0	403	kfree(dev);
86166b7b JK	404	goto out;
	405	}
	406
7d672cd7	407	mutex_unlock(&minors_lock);
86166b7b JK	408	init_waitqueue_head(&dev->wait);
	409	INIT_LIST_HEAD(&dev->list);
	410
	411	dev->hid = hid;
	412	dev->minor = minor;
	413
	414	dev->exist = 1;
	415	hid->hidraw = dev;
	416
	417	out:
	418	return result;
	419
	420	}
	421	EXPORT_SYMBOL_GPL(hidraw_connect);
	422
	423	void hidraw_disconnect(struct hid_device *hid)
	424	{
	425	struct hidraw *hidraw = hid->hidraw;
	426
	427	hidraw->exist = 0;
	428
7d672cd7	429	mutex_lock(&minors_lock);
86166b7b	430	hidraw_table[hidraw->minor] = NULL;
7d672cd7	431	mutex_unlock(&minors_lock);
86166b7b JK	432
	433	device_destroy(hidraw_class, MKDEV(hidraw_major, hidraw->minor));
	434
	435	if (hidraw->open) {
5bea7660	436	hid_hw_close(hid);
86166b7b JK	437	wake_up_interruptible(&hidraw->wait);
	438	} else {
	439	kfree(hidraw);
	440	}
	441	}
	442	EXPORT_SYMBOL_GPL(hidraw_disconnect);
	443
	444	int __init hidraw_init(void)
	445	{
	446	int result;
	447	dev_t dev_id;
	448
	449	result = alloc_chrdev_region(&dev_id, HIDRAW_FIRST_MINOR,
	450	HIDRAW_MAX_DEVICES, "hidraw");
	451
	452	hidraw_major = MAJOR(dev_id);
	453
	454	if (result < 0) {
4291ee30	455	pr_warn("can't get major number\n");
86166b7b JK	456	result = 0;
	457	goto out;
	458	}
	459
	460	hidraw_class = class_create(THIS_MODULE, "hidraw");
	461	if (IS_ERR(hidraw_class)) {
	462	result = PTR_ERR(hidraw_class);
	463	unregister_chrdev(hidraw_major, "hidraw");
	464	goto out;
	465	}
	466
	467	cdev_init(&hidraw_cdev, &hidraw_ops);
	468	cdev_add(&hidraw_cdev, dev_id, HIDRAW_MAX_DEVICES);
	469	out:
	470	return result;
	471	}
	472
140ae3eb	473	void hidraw_exit(void)
86166b7b JK	474	{
	475	dev_t dev_id = MKDEV(hidraw_major, 0);
	476
	477	cdev_del(&hidraw_cdev);
	478	class_destroy(hidraw_class);
	479	unregister_chrdev_region(dev_id, HIDRAW_MAX_DEVICES);
	480
	481	}