blob: 8efc5e06b0f7ed50ca9f03fc630b2417b6f04326 [file] [log] [blame]
// SPDX-License-Identifier: GPL-2.0-or-later
/*
* VIDEO MOTION CODECs internal API for video devices
*
* Interface for MJPEG (and maybe later MPEG/WAVELETS) codec's
* bound to a master device.
*
* (c) 2002 Wolfgang Scherr <scherr@net4you.at>
*/
#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/init.h>
#include <linux/types.h>
#include <linux/slab.h>
#include "videocodec.h"
struct attached_list {
struct videocodec *codec;
struct attached_list *next;
};
struct codec_list {
const struct videocodec *codec;
int attached;
struct attached_list *list;
struct codec_list *next;
};
static struct codec_list *codeclist_top;
/* ================================================= */
/* function prototypes of the master/slave interface */
/* ================================================= */
struct videocodec *videocodec_attach(struct videocodec_master *master)
{
struct codec_list *h = codeclist_top;
struct zoran *zr;
struct attached_list *a, *ptr;
struct videocodec *codec;
int res;
if (!master) {
pr_err("%s: no data\n", __func__);
return NULL;
}
zr = videocodec_master_to_zoran(master);
zrdev_dbg(zr, "%s: '%s', flags %lx, magic %lx\n", __func__,
master->name, master->flags, master->magic);
if (!h) {
zrdev_err(zr, "%s: no device available\n", __func__);
return NULL;
}
while (h) {
// attach only if the slave has at least the flags
// expected by the master
if ((master->flags & h->codec->flags) == master->flags) {
zrdev_dbg(zr, "%s: try '%s'\n", __func__, h->codec->name);
codec = kmemdup(h->codec, sizeof(struct videocodec), GFP_KERNEL);
if (!codec)
goto out_kfree;
res = strlen(codec->name);
snprintf(codec->name + res, sizeof(codec->name) - res, "[%d]", h->attached);
codec->master_data = master;
res = codec->setup(codec);
if (res == 0) {
zrdev_dbg(zr, "%s: '%s'\n", __func__, codec->name);
ptr = kzalloc(sizeof(*ptr), GFP_KERNEL);
if (!ptr)
goto out_kfree;
ptr->codec = codec;
a = h->list;
if (!a) {
h->list = ptr;
zrdev_dbg(zr, "videocodec: first element\n");
} else {
while (a->next)
a = a->next; // find end
a->next = ptr;
zrdev_dbg(zr, "videocodec: in after '%s'\n",
h->codec->name);
}
h->attached += 1;
return codec;
}
kfree(codec);
}
h = h->next;
}
zrdev_err(zr, "%s: no codec found!\n", __func__);
return NULL;
out_kfree:
kfree(codec);
return NULL;
}
int videocodec_detach(struct videocodec *codec)
{
struct codec_list *h = codeclist_top;
struct zoran *zr;
struct attached_list *a, *prev;
int res;
if (!codec) {
pr_err("%s: no data\n", __func__);
return -EINVAL;
}
zr = videocodec_to_zoran(codec);
zrdev_dbg(zr, "%s: '%s', type: %x, flags %lx, magic %lx\n", __func__,
codec->name, codec->type, codec->flags, codec->magic);
if (!h) {
zrdev_err(zr, "%s: no device left...\n", __func__);
return -ENXIO;
}
while (h) {
a = h->list;
prev = NULL;
while (a) {
if (codec == a->codec) {
res = a->codec->unset(a->codec);
if (res >= 0) {
zrdev_dbg(zr, "%s: '%s'\n", __func__,
a->codec->name);
a->codec->master_data = NULL;
} else {
zrdev_err(zr, "%s: '%s'\n", __func__, a->codec->name);
a->codec->master_data = NULL;
}
if (!prev) {
h->list = a->next;
zrdev_dbg(zr, "videocodec: delete first\n");
} else {
prev->next = a->next;
zrdev_dbg(zr, "videocodec: delete middle\n");
}
kfree(a->codec);
kfree(a);
h->attached -= 1;
return 0;
}
prev = a;
a = a->next;
}
h = h->next;
}
zrdev_err(zr, "%s: given codec not found!\n", __func__);
return -EINVAL;
}
int videocodec_register(const struct videocodec *codec)
{
struct codec_list *ptr, *h = codeclist_top;
struct zoran *zr;
if (!codec) {
pr_err("%s: no data!\n", __func__);
return -EINVAL;
}
zr = videocodec_to_zoran((struct videocodec *)codec);
zrdev_dbg(zr,
"videocodec: register '%s', type: %x, flags %lx, magic %lx\n",
codec->name, codec->type, codec->flags, codec->magic);
ptr = kzalloc(sizeof(*ptr), GFP_KERNEL);
if (!ptr)
return -ENOMEM;
ptr->codec = codec;
if (!h) {
codeclist_top = ptr;
zrdev_dbg(zr, "videocodec: hooked in as first element\n");
} else {
while (h->next)
h = h->next; // find the end
h->next = ptr;
zrdev_dbg(zr, "videocodec: hooked in after '%s'\n",
h->codec->name);
}
return 0;
}
int videocodec_unregister(const struct videocodec *codec)
{
struct codec_list *prev = NULL, *h = codeclist_top;
struct zoran *zr;
if (!codec) {
pr_err("%s: no data!\n", __func__);
return -EINVAL;
}
zr = videocodec_to_zoran((struct videocodec *)codec);
zrdev_dbg(zr,
"videocodec: unregister '%s', type: %x, flags %lx, magic %lx\n",
codec->name, codec->type, codec->flags, codec->magic);
if (!h) {
zrdev_err(zr, "%s: no device left...\n", __func__);
return -ENXIO;
}
while (h) {
if (codec == h->codec) {
if (h->attached) {
zrdev_err(zr, "videocodec: '%s' is used\n",
h->codec->name);
return -EBUSY;
}
zrdev_dbg(zr, "videocodec: unregister '%s' is ok.\n",
h->codec->name);
if (!prev) {
codeclist_top = h->next;
zrdev_dbg(zr,
"videocodec: delete first element\n");
} else {
prev->next = h->next;
zrdev_dbg(zr,
"videocodec: delete middle element\n");
}
kfree(h);
return 0;
}
prev = h;
h = h->next;
}
zrdev_err(zr, "%s: given codec not found!\n", __func__);
return -EINVAL;
}
int videocodec_debugfs_show(struct seq_file *m)
{
struct codec_list *h = codeclist_top;
struct attached_list *a;
seq_puts(m, "<S>lave or attached <M>aster name type flags magic ");
seq_puts(m, "(connected as)\n");
while (h) {
seq_printf(m, "S %32s %04x %08lx %08lx (TEMPLATE)\n",
h->codec->name, h->codec->type,
h->codec->flags, h->codec->magic);
a = h->list;
while (a) {
seq_printf(m, "M %32s %04x %08lx %08lx (%s)\n",
a->codec->master_data->name,
a->codec->master_data->type,
a->codec->master_data->flags,
a->codec->master_data->magic,
a->codec->name);
a = a->next;
}
h = h->next;
}
return 0;
}