linux/drivers/gpu/drm/display/drm_dp_aux_dev.c

/*
 * Copyright © 2015 Intel Corporation
 *
 * Permission is hereby granted, free of charge, to any person obtaining a
 * copy of this software and associated documentation files (the "Software"),
 * to deal in the Software without restriction, including without limitation
 * the rights to use, copy, modify, merge, publish, distribute, sublicense,
 * and/or sell copies of the Software, and to permit persons to whom the
 * Software is furnished to do so, subject to the following conditions:
 *
 * The above copyright notice and this permission notice (including the next
 * paragraph) shall be included in all copies or substantial portions of the
 * Software.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
 * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
 * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
 * IN THE SOFTWARE.
 *
 * Authors:
 *    Rafael Antognolli <[email protected]>
 *
 */

#include <linux/device.h>
#include <linux/fs.h>
#include <linux/init.h>
#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/sched/signal.h>
#include <linux/slab.h>
#include <linux/uaccess.h>
#include <linux/uio.h>

#include <drm/display/drm_dp_helper.h>
#include <drm/display/drm_dp_mst_helper.h>
#include <drm/drm_crtc.h>
#include <drm/drm_print.h>

#include "drm_dp_helper_internal.h"

struct drm_dp_aux_dev { … };

#define DRM_AUX_MINORS …
#define AUX_MAX_OFFSET …
static DEFINE_IDR(aux_idr);
static DEFINE_MUTEX(aux_idr_mutex);
static struct class *drm_dp_aux_dev_class;
static int drm_dev_major = …;

static struct drm_dp_aux_dev *drm_dp_aux_dev_get_by_minor(unsigned index)
{ … }

static struct drm_dp_aux_dev *alloc_drm_dp_aux_dev(struct drm_dp_aux *aux)
{ … }

static void release_drm_dp_aux_dev(struct kref *ref)
{ … }

static ssize_t name_show(struct device *dev,
			 struct device_attribute *attr, char *buf)
{ … }
static DEVICE_ATTR_RO(name);

static struct attribute *drm_dp_aux_attrs[] = …;
ATTRIBUTE_GROUPS(…);

static int auxdev_open(struct inode *inode, struct file *file)
{ … }

static loff_t auxdev_llseek(struct file *file, loff_t offset, int whence)
{ … }

static ssize_t auxdev_read_iter(struct kiocb *iocb, struct iov_iter *to)
{ … }

static ssize_t auxdev_write_iter(struct kiocb *iocb, struct iov_iter *from)
{ … }

static int auxdev_release(struct inode *inode, struct file *file)
{ … }

static const struct file_operations auxdev_fops = …;

#define to_auxdev(d) …

static struct drm_dp_aux_dev *drm_dp_aux_dev_get_by_aux(struct drm_dp_aux *aux)
{ … }

void drm_dp_aux_unregister_devnode(struct drm_dp_aux *aux)
{ … }

int drm_dp_aux_register_devnode(struct drm_dp_aux *aux)
{ … }

int drm_dp_aux_dev_init(void)
{ … }

void drm_dp_aux_dev_exit(void)
{ … }