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/*
* Copyright (C) ST-Ericsson SA 2011
*
* Device for display cloning on external output.
*
* Author: Per-Daniel Olsson <per-daniel.olsson@stericsson.com>
* for ST-Ericsson.
*
* License terms: GNU General Public License (GPL), version 2.
*/
#include <linux/kernel.h>
#include <linux/fs.h>
#include <linux/err.h>
#include <linux/slab.h>
#include <linux/miscdevice.h>
#include <linux/uaccess.h>
#include <linux/list.h>
#include <linux/mutex.h>
#include <linux/ioctl.h>
#include <linux/clonedev.h>
#include <linux/compdev.h>
#include <linux/mm.h>
#include <video/mcde.h>
static LIST_HEAD(dev_list);
static DEFINE_MUTEX(dev_list_lock);
struct clonedev {
struct mutex lock;
struct miscdevice mdev;
struct list_head list;
bool open;
struct compdev *src_compdev;
struct compdev *dst_compdev;
bool overlay_case;
struct compdev_size dst_size;
struct compdev_scene_info s_info;
};
static void best_fit(struct compdev_rect *src_rect,
struct compdev_size *dst_size,
struct compdev_img *img)
{
/* aspect ratio in 26.6 fixed point */
int aspect = 1;
int dst_w;
int dst_h;
if (img->rotation == COMPDEV_ROT_90_CCW ||
img->rotation == COMPDEV_ROT_270_CCW)
aspect = (src_rect->height << 6) / src_rect->width;
else
aspect = (src_rect->width << 6) / src_rect->height;
dst_w = aspect * dst_size->height >> 6;
dst_h = dst_size->height;
img->dst_rect.y = 0;
if (dst_w > dst_size->width) {
/*
* Destination rectangle too wide.
* Clamp to image width. Keep aspect ratio.
*/
dst_h = (dst_size->width << 6) / aspect;
dst_w = dst_size->width;
}
/* center the image */
if (dst_w < dst_size->width) {
int offset = (dst_size->width - dst_w) / 2;
img->dst_rect.x = offset;
}
if (dst_h < dst_size->height) {
int offset = (dst_size->height - dst_h) / 2;
img->dst_rect.y = offset;
}
img->dst_rect.width = dst_w;
img->dst_rect.height = dst_h;
}
static int clonedev_open(struct inode *inode, struct file *file)
{
struct clonedev *cd = NULL;
mutex_lock(&dev_list_lock);
list_for_each_entry(cd, &dev_list, list)
if (cd->mdev.minor == iminor(inode))
break;
if (&cd->list == &dev_list) {
mutex_unlock(&dev_list_lock);
return -ENODEV;
}
if (cd->open) {
mutex_unlock(&dev_list_lock);
return -EBUSY;
}
cd->open = true;
mutex_unlock(&dev_list_lock);
file->private_data = cd;
return 0;
}
static int clonedev_release(struct inode *inode, struct file *file)
{
struct clonedev *cd = NULL;
mutex_lock(&dev_list_lock);
list_for_each_entry(cd, &dev_list, list)
if (cd->mdev.minor == iminor(inode))
break;
mutex_unlock(&dev_list_lock);
if (&cd->list == &dev_list)
return -ENODEV;
cd->open = false;
return 0;
}
static long clonedev_ioctl(struct file *file,
unsigned int cmd,
unsigned long arg)
{
int ret;
struct clonedev *cd = (struct clonedev *)file->private_data;
mutex_lock(&cd->lock);
switch (cmd) {
case CLONEDEV_SET_MODE_IOC:
/* TODO: Get the user data */
break;
default:
ret = -ENOSYS;
}
mutex_unlock(&cd->lock);
return ret;
}
static const struct file_operations clonedev_fops = {
.open = clonedev_open,
.release = clonedev_release,
.unlocked_ioctl = clonedev_ioctl,
};
static void init_clonedev(struct clonedev *cd, const char *name)
{
mutex_init(&cd->lock);
INIT_LIST_HEAD(&cd->list);
cd->mdev.minor = MISC_DYNAMIC_MINOR;
cd->mdev.name = name;
cd->mdev.fops = &clonedev_fops;
}
static void clonedev_post_buffer_callback(void *data,
struct compdev_img *cb_img)
{
struct clonedev *cd = (struct clonedev *)data;
mutex_lock(&cd->lock);
if (!cd->overlay_case || (cd->overlay_case &&
(cb_img->flags & COMPDEV_OVERLAY_FLAG))) {
struct compdev_img img;
img = *cb_img;
if (img.flags & COMPDEV_BYPASS_FLAG)
img.flags &= ~COMPDEV_BYPASS_FLAG;
if (cd->overlay_case)
img.rotation = cd->s_info.ovly_rotation;
else
img.rotation = cd->s_info.fb_rotation;
best_fit(&img.src_rect, &cd->dst_size, &img);
compdev_post_buffer(cd->dst_compdev, &img);
}
mutex_unlock(&cd->lock);
}
static void clonedev_post_scene_info_callback(void *data,
struct compdev_scene_info *s_info)
{
struct clonedev *cd = (struct clonedev *)data;
mutex_lock(&cd->lock);
if (s_info->img_count > 1)
cd->overlay_case = true;
else
cd->overlay_case = false;
cd->s_info = *s_info;
cd->s_info.img_count = 1;
compdev_post_scene_info(cd->dst_compdev, &cd->s_info);
mutex_unlock(&cd->lock);
}
int clonedev_create(void)
{
int ret;
struct clonedev *cd;
static int counter;
char name[10];
cd = kzalloc(sizeof(struct clonedev), GFP_KERNEL);
if (!cd)
return -ENOMEM;
snprintf(name, sizeof(name), "%s%d", CLONEDEV_DEFAULT_DEVICE_PREFIX,
counter++);
init_clonedev(cd, name);
ret = misc_register(&cd->mdev);
if (ret)
goto fail_register_misc;
mutex_lock(&dev_list_lock);
list_add_tail(&cd->list, &dev_list);
mutex_unlock(&dev_list_lock);
mutex_lock(&cd->lock);
compdev_get(0, &cd->src_compdev);
compdev_get(1, &cd->dst_compdev);
compdev_get_size(cd->dst_compdev, &cd->dst_size);
compdev_register_listener_callbacks(cd->src_compdev, (void *)cd,
&clonedev_post_buffer_callback,
&clonedev_post_scene_info_callback);
mutex_unlock(&cd->lock);
goto out;
fail_register_misc:
kfree(cd);
out:
return ret;
}
void clonedev_destroy(void)
{
struct clonedev *cd;
struct clonedev *tmp;
mutex_lock(&dev_list_lock);
list_for_each_entry_safe(cd, tmp, &dev_list, list) {
compdev_put(cd->src_compdev);
compdev_put(cd->dst_compdev);
compdev_deregister_callbacks(cd->src_compdev);
list_del(&cd->list);
misc_deregister(&cd->mdev);
kfree(cd);
break;
}
mutex_unlock(&dev_list_lock);
}
static void clonedev_destroy_all(void)
{
struct clonedev *cd;
struct clonedev *tmp;
mutex_lock(&dev_list_lock);
list_for_each_entry_safe(cd, tmp, &dev_list, list) {
list_del(&cd->list);
misc_deregister(&cd->mdev);
kfree(cd);
}
mutex_unlock(&dev_list_lock);
mutex_destroy(&dev_list_lock);
}
static int __init clonedev_init(void)
{
pr_info("%s\n", __func__);
mutex_init(&dev_list_lock);
return 0;
}
module_init(clonedev_init);
static void __exit clonedev_exit(void)
{
clonedev_destroy_all();
pr_info("%s\n", __func__);
}
module_exit(clonedev_exit);
MODULE_AUTHOR("Per-Daniel Olsson <per-daniel.olsson@stericsson.com>");
MODULE_LICENSE("GPL");
MODULE_DESCRIPTION("Device for display cloning on external output");
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