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|
/*
* cx18 file operation functions
*
* Derived from ivtv-fileops.c
*
* Copyright (C) 2007 Hans Verkuil <hverkuil@xs4all.nl>
* Copyright (C) 2008 Andy Walls <awalls@md.metrocast.net>
*
* 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; either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*/
#include "cx18-driver.h"
#include "cx18-fileops.h"
#include "cx18-i2c.h"
#include "cx18-queue.h"
#include "cx18-vbi.h"
#include "cx18-audio.h"
#include "cx18-mailbox.h"
#include "cx18-scb.h"
#include "cx18-streams.h"
#include "cx18-controls.h"
#include "cx18-ioctl.h"
#include "cx18-cards.h"
#include <media/v4l2-event.h>
/* This function tries to claim the stream for a specific file descriptor.
If no one else is using this stream then the stream is claimed and
associated VBI and IDX streams are also automatically claimed.
Possible error returns: -EBUSY if someone else has claimed
the stream or 0 on success. */
int cx18_claim_stream(struct cx18_open_id *id, int type)
{
struct cx18 *cx = id->cx;
struct cx18_stream *s = &cx->streams[type];
struct cx18_stream *s_assoc;
/* Nothing should ever try to directly claim the IDX stream */
if (type == CX18_ENC_STREAM_TYPE_IDX) {
CX18_WARN("MPEG Index stream cannot be claimed directly, but something tried.\n");
return -EINVAL;
}
if (test_and_set_bit(CX18_F_S_CLAIMED, &s->s_flags)) {
/* someone already claimed this stream */
if (s->id == id->open_id) {
/* yes, this file descriptor did. So that's OK. */
return 0;
}
if (s->id == -1 && type == CX18_ENC_STREAM_TYPE_VBI) {
/* VBI is handled already internally, now also assign
the file descriptor to this stream for external
reading of the stream. */
s->id = id->open_id;
CX18_DEBUG_INFO("Start Read VBI\n");
return 0;
}
/* someone else is using this stream already */
CX18_DEBUG_INFO("Stream %d is busy\n", type);
return -EBUSY;
}
s->id = id->open_id;
/*
* CX18_ENC_STREAM_TYPE_MPG needs to claim:
* CX18_ENC_STREAM_TYPE_VBI, if VBI insertion is on for sliced VBI, or
* CX18_ENC_STREAM_TYPE_IDX, if VBI insertion is off for sliced VBI
* (We don't yet fix up MPEG Index entries for our inserted packets).
*
* For all other streams we're done.
*/
if (type != CX18_ENC_STREAM_TYPE_MPG)
return 0;
s_assoc = &cx->streams[CX18_ENC_STREAM_TYPE_IDX];
if (cx->vbi.insert_mpeg && !cx18_raw_vbi(cx))
s_assoc = &cx->streams[CX18_ENC_STREAM_TYPE_VBI];
else if (!cx18_stream_enabled(s_assoc))
return 0;
set_bit(CX18_F_S_CLAIMED, &s_assoc->s_flags);
/* mark that it is used internally */
set_bit(CX18_F_S_INTERNAL_USE, &s_assoc->s_flags);
return 0;
}
EXPORT_SYMBOL(cx18_claim_stream);
/* This function releases a previously claimed stream. It will take into
account associated VBI streams. */
void cx18_release_stream(struct cx18_stream *s)
{
struct cx18 *cx = s->cx;
struct cx18_stream *s_assoc;
s->id = -1;
if (s->type == CX18_ENC_STREAM_TYPE_IDX) {
/*
* The IDX stream is only used internally, and can
* only be indirectly unclaimed by unclaiming the MPG stream.
*/
return;
}
if (s->type == CX18_ENC_STREAM_TYPE_VBI &&
test_bit(CX18_F_S_INTERNAL_USE, &s->s_flags)) {
/* this stream is still in use internally */
return;
}
if (!test_and_clear_bit(CX18_F_S_CLAIMED, &s->s_flags)) {
CX18_DEBUG_WARN("Release stream %s not in use!\n", s->name);
return;
}
cx18_flush_queues(s);
/*
* CX18_ENC_STREAM_TYPE_MPG needs to release the
* CX18_ENC_STREAM_TYPE_VBI and/or CX18_ENC_STREAM_TYPE_IDX streams.
*
* For all other streams we're done.
*/
if (s->type != CX18_ENC_STREAM_TYPE_MPG)
return;
/* Unclaim the associated MPEG Index stream */
s_assoc = &cx->streams[CX18_ENC_STREAM_TYPE_IDX];
if (test_and_clear_bit(CX18_F_S_INTERNAL_USE, &s_assoc->s_flags)) {
clear_bit(CX18_F_S_CLAIMED, &s_assoc->s_flags);
cx18_flush_queues(s_assoc);
}
/* Unclaim the associated VBI stream */
s_assoc = &cx->streams[CX18_ENC_STREAM_TYPE_VBI];
if (test_and_clear_bit(CX18_F_S_INTERNAL_USE, &s_assoc->s_flags)) {
if (s_assoc->id == -1) {
/*
* The VBI stream is not still claimed by a file
* descriptor, so completely unclaim it.
*/
clear_bit(CX18_F_S_CLAIMED, &s_assoc->s_flags);
cx18_flush_queues(s_assoc);
}
}
}
EXPORT_SYMBOL(cx18_release_stream);
static void cx18_dualwatch(struct cx18 *cx)
{
struct v4l2_tuner vt;
u32 new_stereo_mode;
const u32 dual = 0x0200;
new_stereo_mode = v4l2_ctrl_g_ctrl(cx->cxhdl.audio_mode);
memset(&vt, 0, sizeof(vt));
cx18_call_all(cx, tuner, g_tuner, &vt);
if (vt.audmode == V4L2_TUNER_MODE_LANG1_LANG2 &&
(vt.rxsubchans & V4L2_TUNER_SUB_LANG2))
new_stereo_mode = dual;
if (new_stereo_mode == cx->dualwatch_stereo_mode)
return;
CX18_DEBUG_INFO("dualwatch: change stereo flag from 0x%x to 0x%x.\n",
cx->dualwatch_stereo_mode, new_stereo_mode);
if (v4l2_ctrl_s_ctrl(cx->cxhdl.audio_mode, new_stereo_mode))
CX18_DEBUG_INFO("dualwatch: changing stereo flag failed\n");
}
static struct cx18_mdl *cx18_get_mdl(struct cx18_stream *s, int non_block,
int *err)
{
struct cx18 *cx = s->cx;
struct cx18_stream
|