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missing file from mainline kernel

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rjkm 2020-11-10 15:52:00 +01:00
parent d2e6c9b2cb
commit 1d3e21894c
1 changed files with 442 additions and 0 deletions
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dvb-core/dvb_vb2.c Normal file
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// SPDX-License-Identifier: GPL-2.0
/*
* dvb-vb2.c - dvb-vb2
*
* Copyright (C) 2015 Samsung Electronics
*
* Author: jh1009.sung@samsung.com
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation.
*/
#include <linux/err.h>
#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/mm.h>
#include <media/dvbdev.h>
#include <media/dvb_vb2.h>
#define DVB_V2_MAX_SIZE (4096 * 188)
static int vb2_debug;
module_param(vb2_debug, int, 0644);
#define dprintk(level, fmt, arg...) \
do { \
if (vb2_debug >= level) \
pr_info("vb2: %s: " fmt, __func__, ## arg); \
} while (0)
static int _queue_setup(struct vb2_queue *vq,
unsigned int *nbuffers, unsigned int *nplanes,
unsigned int sizes[], struct device *alloc_devs[])
{
struct dvb_vb2_ctx *ctx = vb2_get_drv_priv(vq);
ctx->buf_cnt = *nbuffers;
*nplanes = 1;
sizes[0] = ctx->buf_siz;
/*
* videobuf2-vmalloc allocator is context-less so no need to set
* alloc_ctxs array.
*/
dprintk(3, "[%s] count=%d, size=%d\n", ctx->name,
*nbuffers, sizes[0]);
return 0;
}
static int _buffer_prepare(struct vb2_buffer *vb)
{
struct dvb_vb2_ctx *ctx = vb2_get_drv_priv(vb->vb2_queue);
unsigned long size = ctx->buf_siz;
if (vb2_plane_size(vb, 0) < size) {
dprintk(1, "[%s] data will not fit into plane (%lu < %lu)\n",
ctx->name, vb2_plane_size(vb, 0), size);
return -EINVAL;
}
vb2_set_plane_payload(vb, 0, size);
dprintk(3, "[%s]\n", ctx->name);
return 0;
}
static void _buffer_queue(struct vb2_buffer *vb)
{
struct dvb_vb2_ctx *ctx = vb2_get_drv_priv(vb->vb2_queue);
struct dvb_buffer *buf = container_of(vb, struct dvb_buffer, vb);
unsigned long flags = 0;
spin_lock_irqsave(&ctx->slock, flags);
list_add_tail(&buf->list, &ctx->dvb_q);
spin_unlock_irqrestore(&ctx->slock, flags);
dprintk(3, "[%s]\n", ctx->name);
}
static int _start_streaming(struct vb2_queue *vq, unsigned int count)
{
struct dvb_vb2_ctx *ctx = vb2_get_drv_priv(vq);
dprintk(3, "[%s] count=%d\n", ctx->name, count);
return 0;
}
static void _stop_streaming(struct vb2_queue *vq)
{
struct dvb_vb2_ctx *ctx = vb2_get_drv_priv(vq);
struct dvb_buffer *buf;
unsigned long flags = 0;
dprintk(3, "[%s]\n", ctx->name);
spin_lock_irqsave(&ctx->slock, flags);
while (!list_empty(&ctx->dvb_q)) {
buf = list_entry(ctx->dvb_q.next,
struct dvb_buffer, list);
vb2_buffer_done(&buf->vb, VB2_BUF_STATE_ERROR);
list_del(&buf->list);
}
spin_unlock_irqrestore(&ctx->slock, flags);
}
static void _dmxdev_lock(struct vb2_queue *vq)
{
struct dvb_vb2_ctx *ctx = vb2_get_drv_priv(vq);
mutex_lock(&ctx->mutex);
dprintk(3, "[%s]\n", ctx->name);
}
static void _dmxdev_unlock(struct vb2_queue *vq)
{
struct dvb_vb2_ctx *ctx = vb2_get_drv_priv(vq);
if (mutex_is_locked(&ctx->mutex))
mutex_unlock(&ctx->mutex);
dprintk(3, "[%s]\n", ctx->name);
}
static const struct vb2_ops dvb_vb2_qops = {
.queue_setup = _queue_setup,
.buf_prepare = _buffer_prepare,
.buf_queue = _buffer_queue,
.start_streaming = _start_streaming,
.stop_streaming = _stop_streaming,
.wait_prepare = _dmxdev_unlock,
.wait_finish = _dmxdev_lock,
};
static void _fill_dmx_buffer(struct vb2_buffer *vb, void *pb)
{
struct dvb_vb2_ctx *ctx = vb2_get_drv_priv(vb->vb2_queue);
struct dmx_buffer *b = pb;
b->index = vb->index;
b->length = vb->planes[0].length;
b->bytesused = vb->planes[0].bytesused;
b->offset = vb->planes[0].m.offset;
dprintk(3, "[%s]\n", ctx->name);
}
static int _fill_vb2_buffer(struct vb2_buffer *vb, struct vb2_plane *planes)
{
struct dvb_vb2_ctx *ctx = vb2_get_drv_priv(vb->vb2_queue);
planes[0].bytesused = 0;
dprintk(3, "[%s]\n", ctx->name);
return 0;
}
static const struct vb2_buf_ops dvb_vb2_buf_ops = {
.fill_user_buffer = _fill_dmx_buffer,
.fill_vb2_buffer = _fill_vb2_buffer,
};
/*
* Videobuf operations
*/
int dvb_vb2_init(struct dvb_vb2_ctx *ctx, const char *name, int nonblocking)
{
struct vb2_queue *q = &ctx->vb_q;
int ret;
memset(ctx, 0, sizeof(struct dvb_vb2_ctx));
q->type = DVB_BUF_TYPE_CAPTURE;
/**capture type*/
q->is_output = 0;
/**only mmap is supported currently*/
q->io_modes = VB2_MMAP;
q->drv_priv = ctx;
q->buf_struct_size = sizeof(struct dvb_buffer);
q->min_buffers_needed = 1;
q->ops = &dvb_vb2_qops;
q->mem_ops = &vb2_vmalloc_memops;
q->buf_ops = &dvb_vb2_buf_ops;
q->num_buffers = 0;
ret = vb2_core_queue_init(q);
if (ret) {
ctx->state = DVB_VB2_STATE_NONE;
dprintk(1, "[%s] errno=%d\n", ctx->name, ret);
return ret;
}
mutex_init(&ctx->mutex);
spin_lock_init(&ctx->slock);
INIT_LIST_HEAD(&ctx->dvb_q);
strscpy(ctx->name, name, DVB_VB2_NAME_MAX);
ctx->nonblocking = nonblocking;
ctx->state = DVB_VB2_STATE_INIT;
dprintk(3, "[%s]\n", ctx->name);
return 0;
}
int dvb_vb2_release(struct dvb_vb2_ctx *ctx)
{
struct vb2_queue *q = (struct vb2_queue *)&ctx->vb_q;
if (ctx->state & DVB_VB2_STATE_INIT)
vb2_core_queue_release(q);
ctx->state = DVB_VB2_STATE_NONE;
dprintk(3, "[%s]\n", ctx->name);
return 0;
}
int dvb_vb2_stream_on(struct dvb_vb2_ctx *ctx)
{
struct vb2_queue *q = &ctx->vb_q;
int ret;
ret = vb2_core_streamon(q, q->type);
if (ret) {
ctx->state = DVB_VB2_STATE_NONE;
dprintk(1, "[%s] errno=%d\n", ctx->name, ret);
return ret;
}
ctx->state |= DVB_VB2_STATE_STREAMON;
dprintk(3, "[%s]\n", ctx->name);
return 0;
}
int dvb_vb2_stream_off(struct dvb_vb2_ctx *ctx)
{
struct vb2_queue *q = (struct vb2_queue *)&ctx->vb_q;
int ret;
ctx->state &= ~DVB_VB2_STATE_STREAMON;
ret = vb2_core_streamoff(q, q->type);
if (ret) {
ctx->state = DVB_VB2_STATE_NONE;
dprintk(1, "[%s] errno=%d\n", ctx->name, ret);
return ret;
}
dprintk(3, "[%s]\n", ctx->name);
return 0;
}
int dvb_vb2_is_streaming(struct dvb_vb2_ctx *ctx)
{
return (ctx->state & DVB_VB2_STATE_STREAMON);
}
int dvb_vb2_fill_buffer(struct dvb_vb2_ctx *ctx,
const unsigned char *src, int len,
enum dmx_buffer_flags *buffer_flags)
{
unsigned long flags = 0;
void *vbuf = NULL;
int todo = len;
unsigned char *psrc = (unsigned char *)src;
int ll = 0;
/*
* normal case: This func is called twice from demux driver
* one with valid src pointer, second time with NULL pointer
*/
if (!src || !len)
return 0;
spin_lock_irqsave(&ctx->slock, flags);
if (buffer_flags && *buffer_flags) {
ctx->flags |= *buffer_flags;
*buffer_flags = 0;
}
while (todo) {
if (!ctx->buf) {
if (list_empty(&ctx->dvb_q)) {
dprintk(3, "[%s] Buffer overflow!!!\n",
ctx->name);
break;
}
ctx->buf = list_entry(ctx->dvb_q.next,
struct dvb_buffer, list);
ctx->remain = vb2_plane_size(&ctx->buf->vb, 0);
ctx->offset = 0;
}
if (!dvb_vb2_is_streaming(ctx)) {
vb2_buffer_done(&ctx->buf->vb, VB2_BUF_STATE_ERROR);
list_del(&ctx->buf->list);
ctx->buf = NULL;
break;
}
/* Fill buffer */
ll = min(todo, ctx->remain);
vbuf = vb2_plane_vaddr(&ctx->buf->vb, 0);
memcpy(vbuf + ctx->offset, psrc, ll);
todo -= ll;
psrc += ll;
ctx->remain -= ll;
ctx->offset += ll;
if (ctx->remain == 0) {
vb2_buffer_done(&ctx->buf->vb, VB2_BUF_STATE_DONE);
list_del(&ctx->buf->list);
ctx->buf = NULL;
}
}
if (ctx->nonblocking && ctx->buf) {
vb2_set_plane_payload(&ctx->buf->vb, 0, ll);
vb2_buffer_done(&ctx->buf->vb, VB2_BUF_STATE_DONE);
list_del(&ctx->buf->list);
ctx->buf = NULL;
}
spin_unlock_irqrestore(&ctx->slock, flags);
if (todo)
dprintk(1, "[%s] %d bytes are dropped.\n", ctx->name, todo);
else
dprintk(3, "[%s]\n", ctx->name);
dprintk(3, "[%s] %d bytes are copied\n", ctx->name, len - todo);
return (len - todo);
}
int dvb_vb2_reqbufs(struct dvb_vb2_ctx *ctx, struct dmx_requestbuffers *req)
{
int ret;
/* Adjust size to a sane value */
if (req->size > DVB_V2_MAX_SIZE)
req->size = DVB_V2_MAX_SIZE;
/* FIXME: round req->size to a 188 or 204 multiple */
ctx->buf_siz = req->size;
ctx->buf_cnt = req->count;
ret = vb2_core_reqbufs(&ctx->vb_q, VB2_MEMORY_MMAP, 0, &req->count);
if (ret) {
ctx->state = DVB_VB2_STATE_NONE;
dprintk(1, "[%s] count=%d size=%d errno=%d\n", ctx->name,
ctx->buf_cnt, ctx->buf_siz, ret);
return ret;
}
ctx->state |= DVB_VB2_STATE_REQBUFS;
dprintk(3, "[%s] count=%d size=%d\n", ctx->name,
ctx->buf_cnt, ctx->buf_siz);
return 0;
}
int dvb_vb2_querybuf(struct dvb_vb2_ctx *ctx, struct dmx_buffer *b)
{
vb2_core_querybuf(&ctx->vb_q, b->index, b);
dprintk(3, "[%s] index=%d\n", ctx->name, b->index);
return 0;
}
int dvb_vb2_expbuf(struct dvb_vb2_ctx *ctx, struct dmx_exportbuffer *exp)
{
struct vb2_queue *q = &ctx->vb_q;
int ret;
ret = vb2_core_expbuf(&ctx->vb_q, &exp->fd, q->type, exp->index,
0, exp->flags);
if (ret) {
dprintk(1, "[%s] index=%d errno=%d\n", ctx->name,
exp->index, ret);
return ret;
}
dprintk(3, "[%s] index=%d fd=%d\n", ctx->name, exp->index, exp->fd);
return 0;
}
int dvb_vb2_qbuf(struct dvb_vb2_ctx *ctx, struct dmx_buffer *b)
{
int ret;
ret = vb2_core_qbuf(&ctx->vb_q, b->index, b, NULL);
if (ret) {
dprintk(1, "[%s] index=%d errno=%d\n", ctx->name,
b->index, ret);
return ret;
}
dprintk(5, "[%s] index=%d\n", ctx->name, b->index);
return 0;
}
int dvb_vb2_dqbuf(struct dvb_vb2_ctx *ctx, struct dmx_buffer *b)
{
unsigned long flags;
int ret;
ret = vb2_core_dqbuf(&ctx->vb_q, &b->index, b, ctx->nonblocking);
if (ret) {
dprintk(1, "[%s] errno=%d\n", ctx->name, ret);
return ret;
}
spin_lock_irqsave(&ctx->slock, flags);
b->count = ctx->count++;
b->flags = ctx->flags;
ctx->flags = 0;
spin_unlock_irqrestore(&ctx->slock, flags);
dprintk(5, "[%s] index=%d, count=%d, flags=%d\n",
ctx->name, b->index, ctx->count, b->flags);
return 0;
}
int dvb_vb2_mmap(struct dvb_vb2_ctx *ctx, struct vm_area_struct *vma)
{
int ret;
ret = vb2_mmap(&ctx->vb_q, vma);
if (ret) {
dprintk(1, "[%s] errno=%d\n", ctx->name, ret);
return ret;
}
dprintk(3, "[%s] ret=%d\n", ctx->name, ret);
return 0;
}
__poll_t dvb_vb2_poll(struct dvb_vb2_ctx *ctx, struct file *file,
poll_table *wait)
{
dprintk(3, "[%s]\n", ctx->name);
return vb2_core_poll(&ctx->vb_q, file, wait);
}