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https://github.com/AuxXxilium/linux_dsm_epyc7002.git
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ba25f9dcc4
The task_struct->pid member is going to be deprecated, so start using the helpers (task_pid_nr/task_pid_vnr/task_pid_nr_ns) in the kernel. The first thing to start with is the pid, printed to dmesg - in this case we may safely use task_pid_nr(). Besides, printks produce more (much more) than a half of all the explicit pid usage. [akpm@linux-foundation.org: git-drm went and changed lots of stuff] Signed-off-by: Pavel Emelyanov <xemul@openvz.org> Cc: Dave Airlie <airlied@linux.ie> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
408 lines
9.0 KiB
C
408 lines
9.0 KiB
C
/*
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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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* 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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#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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#include <linux/hidraw.h>
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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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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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while (ret == 0) {
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mutex_lock(&list->read_mutex);
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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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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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/* 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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set_current_state(TASK_RUNNING);
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remove_wait_queue(&list->hidraw->wait, &wait);
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}
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if (ret)
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goto out;
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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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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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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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/* 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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if (!dev->hid_output_raw_report)
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return -ENODEV;
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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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task_pid_nr(current));
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return -EINVAL;
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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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task_pid_nr(current));
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return -EINVAL;
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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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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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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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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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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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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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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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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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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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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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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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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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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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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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return 0;
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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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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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case HIDIOCGRDESC:
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{
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__u32 len;
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if (get_user(len, (int __user *)arg))
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return -EFAULT;
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if (len > HID_MAX_DESCRIPTOR_SIZE - 1)
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return -EINVAL;
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if (copy_to_user(user_arg + offsetof(
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struct hidraw_report_descriptor,
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value[0]),
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dev->hid->rdesc,
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min(dev->hid->rsize, 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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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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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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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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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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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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wake_up_interruptible(&dev->wait);
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}
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EXPORT_SYMBOL_GPL(hidraw_report_event);
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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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/* 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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dev = kzalloc(sizeof(struct hidraw), GFP_KERNEL);
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if (!dev)
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return -ENOMEM;
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result = -EINVAL;
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spin_lock(&minors_lock);
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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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spin_unlock(&minors_lock);
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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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dev->dev = device_create(hidraw_class, NULL, MKDEV(hidraw_major, minor),
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"%s%d", "hidraw", minor);
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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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init_waitqueue_head(&dev->wait);
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INIT_LIST_HEAD(&dev->list);
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dev->hid = hid;
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dev->minor = minor;
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dev->exist = 1;
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hid->hidraw = dev;
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out:
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return result;
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}
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EXPORT_SYMBOL_GPL(hidraw_connect);
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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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hidraw->exist = 0;
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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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device_destroy(hidraw_class, MKDEV(hidraw_major, hidraw->minor));
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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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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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result = alloc_chrdev_region(&dev_id, HIDRAW_FIRST_MINOR,
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HIDRAW_MAX_DEVICES, "hidraw");
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hidraw_major = MAJOR(dev_id);
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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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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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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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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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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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