![Andrew Duggan](/assets/img/avatar_default.png)
This patch fixes sending SIGIO from hidraw_report_event by creating a fasync handler which adds the fasync entry. Signed-off-by: Andrew Duggan <aduggan@synaptics.com> Signed-off-by: Jiri Kosina <jkosina@suse.cz>
603 lines
13 KiB
C
603 lines
13 KiB
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 (signal_pending(current)) {
|
|
ret = -ERESTARTSYS;
|
|
break;
|
|
}
|
|
if (!list->hidraw->exist) {
|
|
ret = -EIO;
|
|
break;
|
|
}
|
|
if (file->f_flags & O_NONBLOCK) {
|
|
ret = -EAGAIN;
|
|
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->buffer[list->tail].value = NULL;
|
|
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_fasync(int fd, struct file *file, int on)
|
|
{
|
|
struct hidraw_list *list = file->private_data;
|
|
|
|
return fasync_helper(fd, file, on, &list->fasync);
|
|
}
|
|
|
|
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;
|
|
int i;
|
|
|
|
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);
|
|
}
|
|
}
|
|
|
|
for (i = 0; i < HIDRAW_BUFFER_SIZE; ++i)
|
|
kfree(list->buffer[i].value);
|
|
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,
|
|
.fasync = hidraw_fasync,
|
|
#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) {
|
|
int new_head = (list->head + 1) & (HIDRAW_BUFFER_SIZE - 1);
|
|
|
|
if (new_head == list->tail)
|
|
continue;
|
|
|
|
if (!(list->buffer[list->head].value = kmemdup(data, len, GFP_ATOMIC))) {
|
|
ret = -ENOMEM;
|
|
break;
|
|
}
|
|
list->buffer[list->head].len = len;
|
|
list->head = new_head;
|
|
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");
|
|
goto out;
|
|
}
|
|
|
|
hidraw_class = class_create(THIS_MODULE, "hidraw");
|
|
if (IS_ERR(hidraw_class)) {
|
|
result = PTR_ERR(hidraw_class);
|
|
goto error_cdev;
|
|
}
|
|
|
|
cdev_init(&hidraw_cdev, &hidraw_ops);
|
|
result = cdev_add(&hidraw_cdev, dev_id, HIDRAW_MAX_DEVICES);
|
|
if (result < 0)
|
|
goto error_class;
|
|
|
|
out:
|
|
return result;
|
|
|
|
error_class:
|
|
class_destroy(hidraw_class);
|
|
error_cdev:
|
|
unregister_chrdev_region(dev_id, HIDRAW_MAX_DEVICES);
|
|
goto out;
|
|
}
|
|
|
|
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);
|
|
|
|
}
|