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32a60955fb
Signed-off-by: Joe Perches <joe@perches.com> Acked-by: Andy Walls <awalls@radix.net> Signed-off-by: Douglas Schilling Landgraf <dougsland@redhat.com> Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>
734 lines
21 KiB
C
734 lines
21 KiB
C
/*
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* cx18 file operation functions
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*
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* Derived from ivtv-fileops.c
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*
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* Copyright (C) 2007 Hans Verkuil <hverkuil@xs4all.nl>
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* Copyright (C) 2008 Andy Walls <awalls@radix.net>
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
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* 02111-1307 USA
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*/
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#include "cx18-driver.h"
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#include "cx18-fileops.h"
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#include "cx18-i2c.h"
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#include "cx18-queue.h"
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#include "cx18-vbi.h"
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#include "cx18-audio.h"
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#include "cx18-mailbox.h"
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#include "cx18-scb.h"
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#include "cx18-streams.h"
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#include "cx18-controls.h"
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#include "cx18-ioctl.h"
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#include "cx18-cards.h"
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/* This function tries to claim the stream for a specific file descriptor.
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If no one else is using this stream then the stream is claimed and
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associated VBI streams are also automatically claimed.
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Possible error returns: -EBUSY if someone else has claimed
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the stream or 0 on success. */
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static int cx18_claim_stream(struct cx18_open_id *id, int type)
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{
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struct cx18 *cx = id->cx;
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struct cx18_stream *s = &cx->streams[type];
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struct cx18_stream *s_vbi;
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int vbi_type;
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if (test_and_set_bit(CX18_F_S_CLAIMED, &s->s_flags)) {
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/* someone already claimed this stream */
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if (s->id == id->open_id) {
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/* yes, this file descriptor did. So that's OK. */
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return 0;
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}
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if (s->id == -1 && type == CX18_ENC_STREAM_TYPE_VBI) {
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/* VBI is handled already internally, now also assign
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the file descriptor to this stream for external
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reading of the stream. */
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s->id = id->open_id;
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CX18_DEBUG_INFO("Start Read VBI\n");
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return 0;
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}
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/* someone else is using this stream already */
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CX18_DEBUG_INFO("Stream %d is busy\n", type);
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return -EBUSY;
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}
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s->id = id->open_id;
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/* CX18_ENC_STREAM_TYPE_MPG needs to claim CX18_ENC_STREAM_TYPE_VBI
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(provided VBI insertion is on and sliced VBI is selected), for all
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other streams we're done */
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if (type == CX18_ENC_STREAM_TYPE_MPG &&
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cx->vbi.insert_mpeg && !cx18_raw_vbi(cx)) {
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vbi_type = CX18_ENC_STREAM_TYPE_VBI;
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} else {
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return 0;
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}
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s_vbi = &cx->streams[vbi_type];
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set_bit(CX18_F_S_CLAIMED, &s_vbi->s_flags);
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/* mark that it is used internally */
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set_bit(CX18_F_S_INTERNAL_USE, &s_vbi->s_flags);
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return 0;
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}
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/* This function releases a previously claimed stream. It will take into
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account associated VBI streams. */
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static void cx18_release_stream(struct cx18_stream *s)
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{
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struct cx18 *cx = s->cx;
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struct cx18_stream *s_vbi;
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s->id = -1;
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if (s->type == CX18_ENC_STREAM_TYPE_VBI &&
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test_bit(CX18_F_S_INTERNAL_USE, &s->s_flags)) {
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/* this stream is still in use internally */
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return;
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}
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if (!test_and_clear_bit(CX18_F_S_CLAIMED, &s->s_flags)) {
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CX18_DEBUG_WARN("Release stream %s not in use!\n", s->name);
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return;
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}
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cx18_flush_queues(s);
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/* CX18_ENC_STREAM_TYPE_MPG needs to release CX18_ENC_STREAM_TYPE_VBI,
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for all other streams we're done */
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if (s->type == CX18_ENC_STREAM_TYPE_MPG)
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s_vbi = &cx->streams[CX18_ENC_STREAM_TYPE_VBI];
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else
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return;
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/* clear internal use flag */
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if (!test_and_clear_bit(CX18_F_S_INTERNAL_USE, &s_vbi->s_flags)) {
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/* was already cleared */
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return;
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}
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if (s_vbi->id != -1) {
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/* VBI stream still claimed by a file descriptor */
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return;
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}
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clear_bit(CX18_F_S_CLAIMED, &s_vbi->s_flags);
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cx18_flush_queues(s_vbi);
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}
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static void cx18_dualwatch(struct cx18 *cx)
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{
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struct v4l2_tuner vt;
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u32 new_bitmap;
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u32 new_stereo_mode;
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const u32 stereo_mask = 0x0300;
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const u32 dual = 0x0200;
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u32 h;
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new_stereo_mode = cx->params.audio_properties & stereo_mask;
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memset(&vt, 0, sizeof(vt));
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cx18_call_all(cx, tuner, g_tuner, &vt);
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if (vt.audmode == V4L2_TUNER_MODE_LANG1_LANG2 &&
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(vt.rxsubchans & V4L2_TUNER_SUB_LANG2))
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new_stereo_mode = dual;
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if (new_stereo_mode == cx->dualwatch_stereo_mode)
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return;
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new_bitmap = new_stereo_mode
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| (cx->params.audio_properties & ~stereo_mask);
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CX18_DEBUG_INFO("dualwatch: change stereo flag from 0x%x to 0x%x. "
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"new audio_bitmask=0x%ux\n",
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cx->dualwatch_stereo_mode, new_stereo_mode, new_bitmap);
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h = cx18_find_handle(cx);
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if (h == CX18_INVALID_TASK_HANDLE) {
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CX18_DEBUG_INFO("dualwatch: can't find valid task handle\n");
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return;
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}
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if (cx18_vapi(cx,
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CX18_CPU_SET_AUDIO_PARAMETERS, 2, h, new_bitmap) == 0) {
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cx->dualwatch_stereo_mode = new_stereo_mode;
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return;
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}
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CX18_DEBUG_INFO("dualwatch: changing stereo flag failed\n");
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}
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static struct cx18_buffer *cx18_get_buffer(struct cx18_stream *s, int non_block, int *err)
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{
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struct cx18 *cx = s->cx;
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struct cx18_stream *s_vbi = &cx->streams[CX18_ENC_STREAM_TYPE_VBI];
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struct cx18_buffer *buf;
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DEFINE_WAIT(wait);
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*err = 0;
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while (1) {
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if (s->type == CX18_ENC_STREAM_TYPE_MPG) {
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/* Process pending program info updates and pending
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VBI data */
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if (time_after(jiffies, cx->dualwatch_jiffies + msecs_to_jiffies(1000))) {
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cx->dualwatch_jiffies = jiffies;
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cx18_dualwatch(cx);
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}
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if (test_bit(CX18_F_S_INTERNAL_USE, &s_vbi->s_flags) &&
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!test_bit(CX18_F_S_APPL_IO, &s_vbi->s_flags)) {
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while ((buf = cx18_dequeue(s_vbi, &s_vbi->q_full))) {
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/* byteswap and process VBI data */
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cx18_process_vbi_data(cx, buf,
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s_vbi->type);
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cx18_stream_put_buf_fw(s_vbi, buf);
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}
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}
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buf = &cx->vbi.sliced_mpeg_buf;
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if (buf->readpos != buf->bytesused)
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return buf;
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}
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/* do we have new data? */
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buf = cx18_dequeue(s, &s->q_full);
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if (buf) {
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if (!test_and_clear_bit(CX18_F_B_NEED_BUF_SWAP,
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&buf->b_flags))
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return buf;
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if (s->type == CX18_ENC_STREAM_TYPE_MPG)
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/* byteswap MPG data */
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cx18_buf_swap(buf);
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else {
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/* byteswap and process VBI data */
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cx18_process_vbi_data(cx, buf, s->type);
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}
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return buf;
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}
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/* return if end of stream */
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if (!test_bit(CX18_F_S_STREAMING, &s->s_flags)) {
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CX18_DEBUG_INFO("EOS %s\n", s->name);
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return NULL;
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}
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/* return if file was opened with O_NONBLOCK */
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if (non_block) {
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*err = -EAGAIN;
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return NULL;
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}
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/* wait for more data to arrive */
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prepare_to_wait(&s->waitq, &wait, TASK_INTERRUPTIBLE);
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/* New buffers might have become available before we were added
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to the waitqueue */
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if (!atomic_read(&s->q_full.buffers))
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schedule();
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finish_wait(&s->waitq, &wait);
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if (signal_pending(current)) {
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/* return if a signal was received */
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CX18_DEBUG_INFO("User stopped %s\n", s->name);
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*err = -EINTR;
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return NULL;
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}
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}
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}
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static void cx18_setup_sliced_vbi_buf(struct cx18 *cx)
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{
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int idx = cx->vbi.inserted_frame % CX18_VBI_FRAMES;
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cx->vbi.sliced_mpeg_buf.buf = cx->vbi.sliced_mpeg_data[idx];
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cx->vbi.sliced_mpeg_buf.bytesused = cx->vbi.sliced_mpeg_size[idx];
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cx->vbi.sliced_mpeg_buf.readpos = 0;
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}
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static size_t cx18_copy_buf_to_user(struct cx18_stream *s,
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struct cx18_buffer *buf, char __user *ubuf, size_t ucount)
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{
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struct cx18 *cx = s->cx;
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size_t len = buf->bytesused - buf->readpos;
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if (len > ucount)
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len = ucount;
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if (cx->vbi.insert_mpeg && s->type == CX18_ENC_STREAM_TYPE_MPG &&
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!cx18_raw_vbi(cx) && buf != &cx->vbi.sliced_mpeg_buf) {
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/*
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* Try to find a good splice point in the PS, just before
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* an MPEG-2 Program Pack start code, and provide only
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* up to that point to the user, so it's easy to insert VBI data
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* the next time around.
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*
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* This will not work for an MPEG-2 TS and has only been
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* verified by analysis to work for an MPEG-2 PS. Helen Buus
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* pointed out this works for the CX23416 MPEG-2 DVD compatible
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* stream, and research indicates both the MPEG 2 SVCD and DVD
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* stream types use an MPEG-2 PS container.
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*/
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/*
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* An MPEG-2 Program Stream (PS) is a series of
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* MPEG-2 Program Packs terminated by an
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* MPEG Program End Code after the last Program Pack.
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* A Program Pack may hold a PS System Header packet and any
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* number of Program Elementary Stream (PES) Packets
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*/
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const char *start = buf->buf + buf->readpos;
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const char *p = start + 1;
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const u8 *q;
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u8 ch = cx->search_pack_header ? 0xba : 0xe0;
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int stuffing, i;
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while (start + len > p) {
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/* Scan for a 0 to find a potential MPEG-2 start code */
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q = memchr(p, 0, start + len - p);
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if (q == NULL)
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break;
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p = q + 1;
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/*
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* Keep looking if not a
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* MPEG-2 Pack header start code: 0x00 0x00 0x01 0xba
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* or MPEG-2 video PES start code: 0x00 0x00 0x01 0xe0
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*/
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if ((char *)q + 15 >= buf->buf + buf->bytesused ||
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q[1] != 0 || q[2] != 1 || q[3] != ch)
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continue;
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/* If expecting the primary video PES */
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if (!cx->search_pack_header) {
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/* Continue if it couldn't be a PES packet */
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if ((q[6] & 0xc0) != 0x80)
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continue;
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/* Check if a PTS or PTS & DTS follow */
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if (((q[7] & 0xc0) == 0x80 && /* PTS only */
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(q[9] & 0xf0) == 0x20) || /* PTS only */
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((q[7] & 0xc0) == 0xc0 && /* PTS & DTS */
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(q[9] & 0xf0) == 0x30)) { /* DTS follows */
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/* Assume we found the video PES hdr */
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ch = 0xba; /* next want a Program Pack*/
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cx->search_pack_header = 1;
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p = q + 9; /* Skip this video PES hdr */
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}
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continue;
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}
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/* We may have found a Program Pack start code */
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/* Get the count of stuffing bytes & verify them */
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stuffing = q[13] & 7;
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/* all stuffing bytes must be 0xff */
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for (i = 0; i < stuffing; i++)
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if (q[14 + i] != 0xff)
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break;
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if (i == stuffing && /* right number of stuffing bytes*/
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(q[4] & 0xc4) == 0x44 && /* marker check */
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(q[12] & 3) == 3 && /* marker check */
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q[14 + stuffing] == 0 && /* PES Pack or Sys Hdr */
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q[15 + stuffing] == 0 &&
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q[16 + stuffing] == 1) {
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/* We declare we actually found a Program Pack*/
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cx->search_pack_header = 0; /* expect vid PES */
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len = (char *)q - start;
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cx18_setup_sliced_vbi_buf(cx);
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break;
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}
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}
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}
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if (copy_to_user(ubuf, (u8 *)buf->buf + buf->readpos, len)) {
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CX18_DEBUG_WARN("copy %zd bytes to user failed for %s\n",
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len, s->name);
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return -EFAULT;
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}
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buf->readpos += len;
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if (s->type == CX18_ENC_STREAM_TYPE_MPG &&
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buf != &cx->vbi.sliced_mpeg_buf)
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cx->mpg_data_received += len;
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return len;
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}
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static ssize_t cx18_read(struct cx18_stream *s, char __user *ubuf,
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size_t tot_count, int non_block)
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{
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struct cx18 *cx = s->cx;
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size_t tot_written = 0;
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int single_frame = 0;
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if (atomic_read(&cx->ana_capturing) == 0 && s->id == -1) {
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/* shouldn't happen */
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CX18_DEBUG_WARN("Stream %s not initialized before read\n",
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s->name);
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return -EIO;
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}
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/* Each VBI buffer is one frame, the v4l2 API says that for VBI the
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frames should arrive one-by-one, so make sure we never output more
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than one VBI frame at a time */
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if (s->type == CX18_ENC_STREAM_TYPE_VBI && !cx18_raw_vbi(cx))
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single_frame = 1;
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for (;;) {
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struct cx18_buffer *buf;
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int rc;
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buf = cx18_get_buffer(s, non_block, &rc);
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/* if there is no data available... */
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if (buf == NULL) {
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/* if we got data, then return that regardless */
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if (tot_written)
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break;
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/* EOS condition */
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if (rc == 0) {
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clear_bit(CX18_F_S_STREAMOFF, &s->s_flags);
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clear_bit(CX18_F_S_APPL_IO, &s->s_flags);
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cx18_release_stream(s);
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}
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/* set errno */
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return rc;
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}
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rc = cx18_copy_buf_to_user(s, buf, ubuf + tot_written,
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tot_count - tot_written);
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if (buf != &cx->vbi.sliced_mpeg_buf) {
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if (buf->readpos == buf->bytesused)
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cx18_stream_put_buf_fw(s, buf);
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else
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cx18_push(s, buf, &s->q_full);
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} else if (buf->readpos == buf->bytesused) {
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int idx = cx->vbi.inserted_frame % CX18_VBI_FRAMES;
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cx->vbi.sliced_mpeg_size[idx] = 0;
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cx->vbi.inserted_frame++;
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cx->vbi_data_inserted += buf->bytesused;
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}
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if (rc < 0)
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return rc;
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tot_written += rc;
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if (tot_written == tot_count || single_frame)
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break;
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}
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return tot_written;
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}
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|
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static ssize_t cx18_read_pos(struct cx18_stream *s, char __user *ubuf,
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size_t count, loff_t *pos, int non_block)
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{
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ssize_t rc = count ? cx18_read(s, ubuf, count, non_block) : 0;
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struct cx18 *cx = s->cx;
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CX18_DEBUG_HI_FILE("read %zd from %s, got %zd\n", count, s->name, rc);
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if (rc > 0)
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pos += rc;
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return rc;
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}
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int cx18_start_capture(struct cx18_open_id *id)
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{
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struct cx18 *cx = id->cx;
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struct cx18_stream *s = &cx->streams[id->type];
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struct cx18_stream *s_vbi;
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if (s->type == CX18_ENC_STREAM_TYPE_RAD) {
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/* you cannot read from these stream types. */
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return -EPERM;
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}
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/* Try to claim this stream. */
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if (cx18_claim_stream(id, s->type))
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return -EBUSY;
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/* If capture is already in progress, then we also have to
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do nothing extra. */
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if (test_bit(CX18_F_S_STREAMOFF, &s->s_flags) ||
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test_and_set_bit(CX18_F_S_STREAMING, &s->s_flags)) {
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set_bit(CX18_F_S_APPL_IO, &s->s_flags);
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return 0;
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}
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|
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/* Start VBI capture if required */
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s_vbi = &cx->streams[CX18_ENC_STREAM_TYPE_VBI];
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if (s->type == CX18_ENC_STREAM_TYPE_MPG &&
|
|
test_bit(CX18_F_S_INTERNAL_USE, &s_vbi->s_flags) &&
|
|
!test_and_set_bit(CX18_F_S_STREAMING, &s_vbi->s_flags)) {
|
|
/* Note: the CX18_ENC_STREAM_TYPE_VBI is claimed
|
|
automatically when the MPG stream is claimed.
|
|
We only need to start the VBI capturing. */
|
|
if (cx18_start_v4l2_encode_stream(s_vbi)) {
|
|
CX18_DEBUG_WARN("VBI capture start failed\n");
|
|
|
|
/* Failure, clean up and return an error */
|
|
clear_bit(CX18_F_S_STREAMING, &s_vbi->s_flags);
|
|
clear_bit(CX18_F_S_STREAMING, &s->s_flags);
|
|
/* also releases the associated VBI stream */
|
|
cx18_release_stream(s);
|
|
return -EIO;
|
|
}
|
|
CX18_DEBUG_INFO("VBI insertion started\n");
|
|
}
|
|
|
|
/* Tell the card to start capturing */
|
|
if (!cx18_start_v4l2_encode_stream(s)) {
|
|
/* We're done */
|
|
set_bit(CX18_F_S_APPL_IO, &s->s_flags);
|
|
/* Resume a possibly paused encoder */
|
|
if (test_and_clear_bit(CX18_F_I_ENC_PAUSED, &cx->i_flags))
|
|
cx18_vapi(cx, CX18_CPU_CAPTURE_PAUSE, 1, s->handle);
|
|
return 0;
|
|
}
|
|
|
|
/* failure, clean up */
|
|
CX18_DEBUG_WARN("Failed to start capturing for stream %s\n", s->name);
|
|
|
|
/* Note: the CX18_ENC_STREAM_TYPE_VBI is released
|
|
automatically when the MPG stream is released.
|
|
We only need to stop the VBI capturing. */
|
|
if (s->type == CX18_ENC_STREAM_TYPE_MPG &&
|
|
test_bit(CX18_F_S_STREAMING, &s_vbi->s_flags)) {
|
|
cx18_stop_v4l2_encode_stream(s_vbi, 0);
|
|
clear_bit(CX18_F_S_STREAMING, &s_vbi->s_flags);
|
|
}
|
|
clear_bit(CX18_F_S_STREAMING, &s->s_flags);
|
|
cx18_release_stream(s);
|
|
return -EIO;
|
|
}
|
|
|
|
ssize_t cx18_v4l2_read(struct file *filp, char __user *buf, size_t count,
|
|
loff_t *pos)
|
|
{
|
|
struct cx18_open_id *id = filp->private_data;
|
|
struct cx18 *cx = id->cx;
|
|
struct cx18_stream *s = &cx->streams[id->type];
|
|
int rc;
|
|
|
|
CX18_DEBUG_HI_FILE("read %zd bytes from %s\n", count, s->name);
|
|
|
|
mutex_lock(&cx->serialize_lock);
|
|
rc = cx18_start_capture(id);
|
|
mutex_unlock(&cx->serialize_lock);
|
|
if (rc)
|
|
return rc;
|
|
return cx18_read_pos(s, buf, count, pos, filp->f_flags & O_NONBLOCK);
|
|
}
|
|
|
|
unsigned int cx18_v4l2_enc_poll(struct file *filp, poll_table *wait)
|
|
{
|
|
struct cx18_open_id *id = filp->private_data;
|
|
struct cx18 *cx = id->cx;
|
|
struct cx18_stream *s = &cx->streams[id->type];
|
|
int eof = test_bit(CX18_F_S_STREAMOFF, &s->s_flags);
|
|
|
|
/* Start a capture if there is none */
|
|
if (!eof && !test_bit(CX18_F_S_STREAMING, &s->s_flags)) {
|
|
int rc;
|
|
|
|
mutex_lock(&cx->serialize_lock);
|
|
rc = cx18_start_capture(id);
|
|
mutex_unlock(&cx->serialize_lock);
|
|
if (rc) {
|
|
CX18_DEBUG_INFO("Could not start capture for %s (%d)\n",
|
|
s->name, rc);
|
|
return POLLERR;
|
|
}
|
|
CX18_DEBUG_FILE("Encoder poll started capture\n");
|
|
}
|
|
|
|
/* add stream's waitq to the poll list */
|
|
CX18_DEBUG_HI_FILE("Encoder poll\n");
|
|
poll_wait(filp, &s->waitq, wait);
|
|
|
|
if (atomic_read(&s->q_full.buffers))
|
|
return POLLIN | POLLRDNORM;
|
|
if (eof)
|
|
return POLLHUP;
|
|
return 0;
|
|
}
|
|
|
|
void cx18_stop_capture(struct cx18_open_id *id, int gop_end)
|
|
{
|
|
struct cx18 *cx = id->cx;
|
|
struct cx18_stream *s = &cx->streams[id->type];
|
|
|
|
CX18_DEBUG_IOCTL("close() of %s\n", s->name);
|
|
|
|
/* 'Unclaim' this stream */
|
|
|
|
/* Stop capturing */
|
|
if (test_bit(CX18_F_S_STREAMING, &s->s_flags)) {
|
|
struct cx18_stream *s_vbi =
|
|
&cx->streams[CX18_ENC_STREAM_TYPE_VBI];
|
|
|
|
CX18_DEBUG_INFO("close stopping capture\n");
|
|
/* Special case: a running VBI capture for VBI insertion
|
|
in the mpeg stream. Need to stop that too. */
|
|
if (id->type == CX18_ENC_STREAM_TYPE_MPG &&
|
|
test_bit(CX18_F_S_STREAMING, &s_vbi->s_flags) &&
|
|
!test_bit(CX18_F_S_APPL_IO, &s_vbi->s_flags)) {
|
|
CX18_DEBUG_INFO("close stopping embedded VBI capture\n");
|
|
cx18_stop_v4l2_encode_stream(s_vbi, 0);
|
|
}
|
|
if (id->type == CX18_ENC_STREAM_TYPE_VBI &&
|
|
test_bit(CX18_F_S_INTERNAL_USE, &s->s_flags))
|
|
/* Also used internally, don't stop capturing */
|
|
s->id = -1;
|
|
else
|
|
cx18_stop_v4l2_encode_stream(s, gop_end);
|
|
}
|
|
if (!gop_end) {
|
|
clear_bit(CX18_F_S_APPL_IO, &s->s_flags);
|
|
clear_bit(CX18_F_S_STREAMOFF, &s->s_flags);
|
|
cx18_release_stream(s);
|
|
}
|
|
}
|
|
|
|
int cx18_v4l2_close(struct file *filp)
|
|
{
|
|
struct cx18_open_id *id = filp->private_data;
|
|
struct cx18 *cx = id->cx;
|
|
struct cx18_stream *s = &cx->streams[id->type];
|
|
|
|
CX18_DEBUG_IOCTL("close() of %s\n", s->name);
|
|
|
|
v4l2_prio_close(&cx->prio, &id->prio);
|
|
|
|
/* Easy case first: this stream was never claimed by us */
|
|
if (s->id != id->open_id) {
|
|
kfree(id);
|
|
return 0;
|
|
}
|
|
|
|
/* 'Unclaim' this stream */
|
|
|
|
/* Stop radio */
|
|
mutex_lock(&cx->serialize_lock);
|
|
if (id->type == CX18_ENC_STREAM_TYPE_RAD) {
|
|
/* Closing radio device, return to TV mode */
|
|
cx18_mute(cx);
|
|
/* Mark that the radio is no longer in use */
|
|
clear_bit(CX18_F_I_RADIO_USER, &cx->i_flags);
|
|
/* Switch tuner to TV */
|
|
cx18_call_all(cx, core, s_std, cx->std);
|
|
/* Select correct audio input (i.e. TV tuner or Line in) */
|
|
cx18_audio_set_io(cx);
|
|
if (atomic_read(&cx->ana_capturing) > 0) {
|
|
/* Undo video mute */
|
|
cx18_vapi(cx, CX18_CPU_SET_VIDEO_MUTE, 2, s->handle,
|
|
cx->params.video_mute |
|
|
(cx->params.video_mute_yuv << 8));
|
|
}
|
|
/* Done! Unmute and continue. */
|
|
cx18_unmute(cx);
|
|
cx18_release_stream(s);
|
|
} else {
|
|
cx18_stop_capture(id, 0);
|
|
}
|
|
kfree(id);
|
|
mutex_unlock(&cx->serialize_lock);
|
|
return 0;
|
|
}
|
|
|
|
static int cx18_serialized_open(struct cx18_stream *s, struct file *filp)
|
|
{
|
|
struct cx18 *cx = s->cx;
|
|
struct cx18_open_id *item;
|
|
|
|
CX18_DEBUG_FILE("open %s\n", s->name);
|
|
|
|
/* Allocate memory */
|
|
item = kmalloc(sizeof(struct cx18_open_id), GFP_KERNEL);
|
|
if (NULL == item) {
|
|
CX18_DEBUG_WARN("nomem on v4l2 open\n");
|
|
return -ENOMEM;
|
|
}
|
|
item->cx = cx;
|
|
item->type = s->type;
|
|
v4l2_prio_open(&cx->prio, &item->prio);
|
|
|
|
item->open_id = cx->open_id++;
|
|
filp->private_data = item;
|
|
|
|
if (item->type == CX18_ENC_STREAM_TYPE_RAD) {
|
|
/* Try to claim this stream */
|
|
if (cx18_claim_stream(item, item->type)) {
|
|
/* No, it's already in use */
|
|
kfree(item);
|
|
return -EBUSY;
|
|
}
|
|
|
|
if (!test_bit(CX18_F_I_RADIO_USER, &cx->i_flags)) {
|
|
if (atomic_read(&cx->ana_capturing) > 0) {
|
|
/* switching to radio while capture is
|
|
in progress is not polite */
|
|
cx18_release_stream(s);
|
|
kfree(item);
|
|
return -EBUSY;
|
|
}
|
|
}
|
|
|
|
/* Mark that the radio is being used. */
|
|
set_bit(CX18_F_I_RADIO_USER, &cx->i_flags);
|
|
/* We have the radio */
|
|
cx18_mute(cx);
|
|
/* Switch tuner to radio */
|
|
cx18_call_all(cx, tuner, s_radio);
|
|
/* Select the correct audio input (i.e. radio tuner) */
|
|
cx18_audio_set_io(cx);
|
|
/* Done! Unmute and continue. */
|
|
cx18_unmute(cx);
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
int cx18_v4l2_open(struct file *filp)
|
|
{
|
|
int res;
|
|
struct video_device *video_dev = video_devdata(filp);
|
|
struct cx18_stream *s = video_get_drvdata(video_dev);
|
|
struct cx18 *cx = s->cx;
|
|
|
|
mutex_lock(&cx->serialize_lock);
|
|
if (cx18_init_on_first_open(cx)) {
|
|
CX18_ERR("Failed to initialize on minor %d\n",
|
|
video_dev->minor);
|
|
mutex_unlock(&cx->serialize_lock);
|
|
return -ENXIO;
|
|
}
|
|
res = cx18_serialized_open(s, filp);
|
|
mutex_unlock(&cx->serialize_lock);
|
|
return res;
|
|
}
|
|
|
|
void cx18_mute(struct cx18 *cx)
|
|
{
|
|
u32 h;
|
|
if (atomic_read(&cx->ana_capturing)) {
|
|
h = cx18_find_handle(cx);
|
|
if (h != CX18_INVALID_TASK_HANDLE)
|
|
cx18_vapi(cx, CX18_CPU_SET_AUDIO_MUTE, 2, h, 1);
|
|
else
|
|
CX18_ERR("Can't find valid task handle for mute\n");
|
|
}
|
|
CX18_DEBUG_INFO("Mute\n");
|
|
}
|
|
|
|
void cx18_unmute(struct cx18 *cx)
|
|
{
|
|
u32 h;
|
|
if (atomic_read(&cx->ana_capturing)) {
|
|
h = cx18_find_handle(cx);
|
|
if (h != CX18_INVALID_TASK_HANDLE) {
|
|
cx18_msleep_timeout(100, 0);
|
|
cx18_vapi(cx, CX18_CPU_SET_MISC_PARAMETERS, 2, h, 12);
|
|
cx18_vapi(cx, CX18_CPU_SET_AUDIO_MUTE, 2, h, 0);
|
|
} else
|
|
CX18_ERR("Can't find valid task handle for unmute\n");
|
|
}
|
|
CX18_DEBUG_INFO("Unmute\n");
|
|
}
|