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@@ -0,0 +1,401 @@
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+/*
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+ * HID raw devices, giving access to raw HID events.
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+ *
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+ * In comparison to hiddev, this device does not process the
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+ * hid events at all (no parsing, no lookups). This lets applications
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+ * to work on raw hid events as they want to, and avoids a need to
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+ * use a transport-specific userspace libhid/libusb libraries.
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+ *
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+ * Copyright (c) 2007 Jiri Kosina
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+ */
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+
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+/*
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+ * This program is free software; you can redistribute it and/or modify it
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+ * under the terms and conditions of the GNU General Public License,
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+ * version 2, as published by the Free Software Foundation.
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+ *
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+ * You should have received a copy of the GNU General Public License along with
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+ * this program; if not, write to the Free Software Foundation, Inc.,
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+ * 51 Franklin St - Fifth Floor, Boston, MA 02110-1301 USA.
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+ */
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+
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+#include <linux/fs.h>
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+#include <linux/module.h>
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+#include <linux/errno.h>
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+#include <linux/kernel.h>
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+#include <linux/init.h>
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+#include <linux/cdev.h>
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+#include <linux/poll.h>
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+#include <linux/device.h>
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+#include <linux/major.h>
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+#include <linux/hid.h>
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+#include <linux/mutex.h>
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+
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+#include <linux/hidraw.h>
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+
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+static int hidraw_major;
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+static struct cdev hidraw_cdev;
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+static struct class *hidraw_class;
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+static struct hidraw *hidraw_table[HIDRAW_MAX_DEVICES];
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+static DEFINE_SPINLOCK(minors_lock);
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+
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+static ssize_t hidraw_read(struct file *file, char __user *buffer, size_t count, loff_t *ppos)
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+{
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+ struct hidraw_list *list = file->private_data;
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+ int ret = 0, len;
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+ char *report;
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+ DECLARE_WAITQUEUE(wait, current);
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+
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+ while (ret == 0) {
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+
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+ mutex_lock(&list->read_mutex);
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+
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+ if (list->head == list->tail) {
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+ add_wait_queue(&list->hidraw->wait, &wait);
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+ set_current_state(TASK_INTERRUPTIBLE);
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+
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+ while (list->head == list->tail) {
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+ if (file->f_flags & O_NONBLOCK) {
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+ ret = -EAGAIN;
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+ break;
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+ }
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+ if (signal_pending(current)) {
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+ ret = -ERESTARTSYS;
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+ break;
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+ }
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+ if (!list->hidraw->exist) {
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+ ret = -EIO;
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+ break;
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+ }
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+
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+ /* allow O_NONBLOCK to work well from other threads */
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+ mutex_unlock(&list->read_mutex);
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+ schedule();
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+ mutex_lock(&list->read_mutex);
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+ set_current_state(TASK_INTERRUPTIBLE);
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+ }
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+
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+ set_current_state(TASK_RUNNING);
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+ remove_wait_queue(&list->hidraw->wait, &wait);
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+ }
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+
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+ if (ret)
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+ goto out;
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+
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+ report = list->buffer[list->tail].value;
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+ len = list->buffer[list->tail].len > count ?
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+ count : list->buffer[list->tail].len;
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+
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+ if (copy_to_user(buffer, list->buffer[list->tail].value, len)) {
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+ ret = -EFAULT;
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+ goto out;
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+ }
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+ ret += len;
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+
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+ kfree(list->buffer[list->tail].value);
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+ list->tail = (list->tail + 1) & (HIDRAW_BUFFER_SIZE - 1);
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+ }
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+out:
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+ mutex_unlock(&list->read_mutex);
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+ return ret;
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+}
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+
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+/* the first byte is expected to be a report number */
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+static ssize_t hidraw_write(struct file *file, const char __user *buffer, size_t count, loff_t *ppos)
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+{
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+ unsigned int minor = iminor(file->f_path.dentry->d_inode);
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+ struct hid_device *dev = hidraw_table[minor]->hid;
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+ __u8 *buf;
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+ int ret = 0;
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+
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+ if (!dev->hid_output_raw_report)
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+ return -ENODEV;
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+
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+ if (count > HID_MIN_BUFFER_SIZE) {
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+ printk(KERN_WARNING "hidraw: pid %d passed too large report\n",
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+ current->pid);
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+ return -EINVAL;
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+ }
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+
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+ if (count < 2) {
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+ printk(KERN_WARNING "hidraw: pid %d passed too short report\n",
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+ current->pid);
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+ return -EINVAL;
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+ }
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+
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+ buf = kmalloc(count * sizeof(__u8), GFP_KERNEL);
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+ if (!buf)
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+ return -ENOMEM;
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+
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+ if (copy_from_user(buf, buffer, count)) {
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+ ret = -EFAULT;
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+ goto out;
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+ }
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+
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+ ret = dev->hid_output_raw_report(dev, buf, count);
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+out:
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+ kfree(buf);
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+ return ret;
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+}
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+
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+static unsigned int hidraw_poll(struct file *file, poll_table *wait)
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+{
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+ struct hidraw_list *list = file->private_data;
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+
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+ poll_wait(file, &list->hidraw->wait, wait);
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+ if (list->head != list->tail)
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+ return POLLIN | POLLRDNORM;
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+ if (!list->hidraw->exist)
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+ return POLLERR | POLLHUP;
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+ return 0;
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+}
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+
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+static int hidraw_open(struct inode *inode, struct file *file)
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+{
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+ unsigned int minor = iminor(inode);
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+ struct hidraw *dev;
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+ struct hidraw_list *list;
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+ int err = 0;
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+
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+ if (!(list = kzalloc(sizeof(struct hidraw_list), GFP_KERNEL))) {
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+ err = -ENOMEM;
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+ goto out;
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+ }
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+
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+ spin_lock(&minors_lock);
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+ if (!hidraw_table[minor]) {
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+ printk(KERN_EMERG "hidraw device with minor %d doesn't exist\n",
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+ minor);
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+ kfree(list);
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+ err = -ENODEV;
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+ goto out_unlock;
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+ }
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+
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+ list->hidraw = hidraw_table[minor];
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+ mutex_init(&list->read_mutex);
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+ list_add_tail(&list->node, &hidraw_table[minor]->list);
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+ file->private_data = list;
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+
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+ dev = hidraw_table[minor];
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+ if (!dev->open++)
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+ dev->hid->hid_open(dev->hid);
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+
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+out_unlock:
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+ spin_unlock(&minors_lock);
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+out:
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+ return err;
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+
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+}
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+
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+static int hidraw_release(struct inode * inode, struct file * file)
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+{
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+ unsigned int minor = iminor(inode);
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+ struct hidraw *dev;
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+ struct hidraw_list *list = file->private_data;
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+
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+ if (!hidraw_table[minor]) {
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+ printk(KERN_EMERG "hidraw device with minor %d doesn't exist\n",
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+ minor);
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+ return -ENODEV;
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+ }
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+
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+ list_del(&list->node);
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+ dev = hidraw_table[minor];
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+ if (!dev->open--) {
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+ if (list->hidraw->exist)
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+ dev->hid->hid_close(dev->hid);
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+ else
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+ kfree(list->hidraw);
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+ }
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+
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+ return 0;
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+}
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+
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+static int hidraw_ioctl(struct inode *inode, struct file *file, unsigned int cmd, unsigned long arg)
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+{
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+ unsigned int minor = iminor(inode);
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+ struct hidraw *dev = hidraw_table[minor];
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+ void __user *user_arg = (void __user*) arg;
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+
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+ switch (cmd) {
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+ case HIDIOCGRDESCSIZE:
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+ if (put_user(dev->hid->rsize, (int __user *)arg))
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+ return -EFAULT;
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+ return 0;
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+
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+ case HIDIOCGRDESC:
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+ {
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+ __u32 len;
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+
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+ if (get_user(len, (int __user *)arg))
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+ return -EFAULT;
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+ if (copy_to_user(*((__u8 **)(user_arg +
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+ sizeof(__u32))),
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+ dev->hid->rdesc, len))
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+ return -EFAULT;
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+ return 0;
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+ }
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+ case HIDIOCGRAWINFO:
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+ {
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+ struct hidraw_devinfo dinfo;
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+
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+ dinfo.bustype = dev->hid->bus;
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+ dinfo.vendor = dev->hid->vendor;
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+ dinfo.product = dev->hid->product;
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+ if (copy_to_user(user_arg, &dinfo, sizeof(dinfo)))
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+ return -EFAULT;
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+
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+ return 0;
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+ }
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+ default:
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+ printk(KERN_EMERG "hidraw: unsupported ioctl() %x\n",
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+ cmd);
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+ }
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+ return -EINVAL;
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+}
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+
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+static const struct file_operations hidraw_ops = {
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+ .owner = THIS_MODULE,
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+ .read = hidraw_read,
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+ .write = hidraw_write,
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+ .poll = hidraw_poll,
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+ .open = hidraw_open,
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+ .release = hidraw_release,
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+ .ioctl = hidraw_ioctl,
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+};
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+
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+void hidraw_report_event(struct hid_device *hid, u8 *data, int len)
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+{
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+ struct hidraw *dev = hid->hidraw;
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+ struct hidraw_list *list;
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+
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+ list_for_each_entry(list, &dev->list, node) {
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+ list->buffer[list->head].value = kmemdup(data, len, GFP_ATOMIC);
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+ list->buffer[list->head].len = len;
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+ list->head = (list->head + 1) & (HIDRAW_BUFFER_SIZE - 1);
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+ kill_fasync(&list->fasync, SIGIO, POLL_IN);
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+ }
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+
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+ wake_up_interruptible(&dev->wait);
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+}
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+EXPORT_SYMBOL_GPL(hidraw_report_event);
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+
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+int hidraw_connect(struct hid_device *hid)
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+{
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+ int minor, result;
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+ struct hidraw *dev;
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+
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+ /* TODO currently we accept any HID device. This should later
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+ * probably be fixed to accept only those devices which provide
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+ * non-input applications
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+ */
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+
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+ dev = kzalloc(sizeof(struct hidraw), GFP_KERNEL);
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+ if (!dev)
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+ return -ENOMEM;
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+
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+ result = -EINVAL;
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+
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+ spin_lock(&minors_lock);
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+
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+ for (minor = 0; minor < HIDRAW_MAX_DEVICES; minor++) {
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+ if (hidraw_table[minor])
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+ continue;
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+ hidraw_table[minor] = dev;
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+ result = 0;
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+ break;
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+ }
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+
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+ spin_unlock(&minors_lock);
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+
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+ if (result) {
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+ kfree(dev);
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+ goto out;
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+ }
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+
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+ dev->dev = device_create(hidraw_class, NULL, MKDEV(hidraw_major, minor),
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+ "%s%d", "hidraw", minor);
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+
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+ if (IS_ERR(dev->dev)) {
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+ spin_lock(&minors_lock);
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+ hidraw_table[minor] = NULL;
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+ spin_unlock(&minors_lock);
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+ result = PTR_ERR(dev->dev);
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+ kfree(dev);
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+ goto out;
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+ }
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+
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+ init_waitqueue_head(&dev->wait);
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+ INIT_LIST_HEAD(&dev->list);
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+
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+ dev->hid = hid;
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+ dev->minor = minor;
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+
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+ dev->exist = 1;
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+ hid->hidraw = dev;
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+
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+out:
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+ return result;
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+
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+}
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+EXPORT_SYMBOL_GPL(hidraw_connect);
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+
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+void hidraw_disconnect(struct hid_device *hid)
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+{
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+ struct hidraw *hidraw = hid->hidraw;
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+
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+ hidraw->exist = 0;
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+
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+ spin_lock(&minors_lock);
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+ hidraw_table[hidraw->minor] = NULL;
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+ spin_unlock(&minors_lock);
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+
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+ device_destroy(hidraw_class, MKDEV(hidraw_major, hidraw->minor));
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+
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+ if (hidraw->open) {
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+ hid->hid_close(hid);
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+ wake_up_interruptible(&hidraw->wait);
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+ } else {
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+ kfree(hidraw);
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+ }
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+}
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+EXPORT_SYMBOL_GPL(hidraw_disconnect);
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+
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+int __init hidraw_init(void)
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+{
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+ int result;
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+ dev_t dev_id;
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+
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+ result = alloc_chrdev_region(&dev_id, HIDRAW_FIRST_MINOR,
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+ HIDRAW_MAX_DEVICES, "hidraw");
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+
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+ hidraw_major = MAJOR(dev_id);
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+
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+ if (result < 0) {
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+ printk(KERN_WARNING "hidraw: can't get major number\n");
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+ result = 0;
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+ goto out;
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+ }
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+
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+ hidraw_class = class_create(THIS_MODULE, "hidraw");
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+ if (IS_ERR(hidraw_class)) {
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+ result = PTR_ERR(hidraw_class);
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+ unregister_chrdev(hidraw_major, "hidraw");
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+ goto out;
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+ }
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+
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+ cdev_init(&hidraw_cdev, &hidraw_ops);
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+ cdev_add(&hidraw_cdev, dev_id, HIDRAW_MAX_DEVICES);
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+out:
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+ return result;
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+}
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+
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+void __exit hidraw_exit(void)
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+{
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+ dev_t dev_id = MKDEV(hidraw_major, 0);
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+
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+ cdev_del(&hidraw_cdev);
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+ class_destroy(hidraw_class);
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+ unregister_chrdev_region(dev_id, HIDRAW_MAX_DEVICES);
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+
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+}
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Jiri Kosina