diff options
Diffstat (limited to 'drivers/media/video/cx18/cx18-fileops.c')
| -rw-r--r-- | drivers/media/video/cx18/cx18-fileops.c | 711 |
1 files changed, 711 insertions, 0 deletions
diff --git a/drivers/media/video/cx18/cx18-fileops.c b/drivers/media/video/cx18/cx18-fileops.c new file mode 100644 index 000000000000..69303065a294 --- /dev/null +++ b/drivers/media/video/cx18/cx18-fileops.c @@ -0,0 +1,711 @@ +/* + * cx18 file operation functions + * + * Derived from ivtv-fileops.c + * + * Copyright (C) 2007 Hans Verkuil <hverkuil@xs4all.nl> + * + * 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. + * + * You should have received a copy of the GNU General Public License + * along with this program; if not, write to the Free Software + * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA + * 02111-1307 USA + */ + +#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" + +/* 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 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_vbi; + int vbi_type; + + 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_DEC_STREAM_TYPE_MPG needs to claim CX18_DEC_STREAM_TYPE_VBI, + CX18_ENC_STREAM_TYPE_MPG needs to claim CX18_ENC_STREAM_TYPE_VBI + (provided VBI insertion is on and sliced VBI is selected), for all + other streams we're done */ + if (type == CX18_ENC_STREAM_TYPE_MPG && + cx->vbi.insert_mpeg && cx->vbi.sliced_in->service_set) { + vbi_type = CX18_ENC_STREAM_TYPE_VBI; + } else { + return 0; + } + s_vbi = &cx->streams[vbi_type]; + + set_bit(CX18_F_S_CLAIMED, &s_vbi->s_flags); + + /* mark that it is used internally */ + set_bit(CX18_F_S_INTERNAL_USE, &s_vbi->s_flags); + return 0; +} + +/* 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_vbi; + + s->id = -1; + 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 CX18_ENC_STREAM_TYPE_VBI, + for all other streams we're done */ + if (s->type == CX18_ENC_STREAM_TYPE_MPG) + s_vbi = &cx->streams[CX18_ENC_STREAM_TYPE_VBI]; + else + return; + + /* clear internal use flag */ + if (!test_and_clear_bit(CX18_F_S_INTERNAL_USE, &s_vbi->s_flags)) { + /* was already cleared */ + return; + } + if (s_vbi->id != -1) { + /* VBI stream still claimed by a file descriptor */ + return; + } + clear_bit(CX18_F_S_CLAIMED, &s_vbi->s_flags); + cx18_flush_queues(s_vbi); +} + +static void cx18_dualwatch(struct cx18 *cx) +{ + struct v4l2_tuner vt; + u16 new_bitmap; + u16 new_stereo_mode; + const u16 stereo_mask = 0x0300; + const u16 dual = 0x0200; + + new_stereo_mode = cx->params.audio_properties & stereo_mask; + memset(&vt, 0, sizeof(vt)); + cx18_call_i2c_clients(cx, VIDIOC_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; + + new_bitmap = new_stereo_mode | (cx->params.audio_properties & ~stereo_mask); + + CX18_DEBUG_INFO("dualwatch: change stereo flag from 0x%x to 0x%x. new audio_bitmask=0x%ux\n", + cx->dualwatch_stereo_mode, new_stereo_mode, new_bitmap); + + if (cx18_vapi(cx, CX18_CPU_SET_AUDIO_PARAMETERS, 2, + cx18_find_handle(cx), new_bitmap) == 0) { + cx->dualwatch_stereo_mode = new_stereo_mode; + return; + } + CX18_DEBUG_INFO("dualwatch: changing stereo flag failed\n"); +} + + +static struct cx18_buffer *cx18_get_buffer(struct cx18_stream *s, int non_block, int *err) +{ + struct cx18 *cx = s->cx; + struct cx18_stream *s_vbi = &cx->streams[CX18_ENC_STREAM_TYPE_VBI]; + struct cx18_buffer *buf; + DEFINE_WAIT(wait); + + *err = 0; + while (1) { + if (s->type == CX18_ENC_STREAM_TYPE_MPG) { + + if (time_after(jiffies, cx->dualwatch_jiffies + msecs_to_jiffies(1000))) { + cx->dualwatch_jiffies = jiffies; + cx18_dualwatch(cx); + } + if (test_bit(CX18_F_S_INTERNAL_USE, &s_vbi->s_flags) && + !test_bit(CX18_F_S_APPL_IO, &s_vbi->s_flags)) { + while ((buf = cx18_dequeue(s_vbi, &s_vbi->q_full))) { + /* byteswap and process VBI data */ +/* cx18_process_vbi_data(cx, buf, s_vbi->dma_pts, s_vbi->type); */ + cx18_enqueue(s_vbi, buf, &s_vbi->q_free); + } + } + buf = &cx->vbi.sliced_mpeg_buf; + if (buf->readpos != buf->bytesused) + return buf; + } + + /* do we have leftover data? */ + buf = cx18_dequeue(s, &s->q_io); + if (buf) + return buf; + + /* do we have new data? */ + buf = cx18_dequeue(s, &s->q_full); + if (buf) { + if (!test_and_clear_bit(CX18_F_B_NEED_BUF_SWAP, + &buf->b_flags)) + return buf; + if (s->type == CX18_ENC_STREAM_TYPE_MPG) + /* byteswap MPG data */ + cx18_buf_swap(buf); + else { + /* byteswap and process VBI data */ + cx18_process_vbi_data(cx, buf, + s->dma_pts, s->type); + } + return buf; + } + + /* return if end of stream */ + if (!test_bit(CX18_F_S_STREAMING, &s->s_flags)) { + CX18_DEBUG_INFO("EOS %s\n", s->name); + return NULL; + } + + /* return if file was opened with O_NONBLOCK */ + if (non_block) { + *err = -EAGAIN; + return NULL; + } + + /* wait for more data to arrive */ + prepare_to_wait(&s->waitq, &wait, TASK_INTERRUPTIBLE); + /* New buffers might have become available before we were added + to the waitqueue */ + if (!s->q_full.buffers) + schedule(); + finish_wait(&s->waitq, &wait); + if (signal_pending(current)) { + /* return if a signal was received */ + CX18_DEBUG_INFO("User stopped %s\n", s->name); + *err = -EINTR; + return NULL; + } + } +} + +static void cx18_setup_sliced_vbi_buf(struct cx18 *cx) +{ + int idx = cx->vbi.inserted_frame % CX18_VBI_FRAMES; + + cx->vbi.sliced_mpeg_buf.buf = cx->vbi.sliced_mpeg_data[idx]; + cx->vbi.sliced_mpeg_buf.bytesused = cx->vbi.sliced_mpeg_size[idx]; + cx->vbi.sliced_mpeg_buf.readpos = 0; +} + +static size_t cx18_copy_buf_to_user(struct cx18_stream *s, + struct cx18_buffer *buf, char __user *ubuf, size_t ucount) +{ + struct cx18 *cx = s->cx; + size_t len = buf->bytesused - buf->readpos; + + if (len > ucount) + len = ucount; + if (cx->vbi.insert_mpeg && s->type == CX18_ENC_STREAM_TYPE_MPG && + cx->vbi.sliced_in->service_set && buf != &cx->vbi.sliced_mpeg_buf) { + const char *start = buf->buf + buf->readpos; + const char *p = start + 1; + const u8 *q; + u8 ch = cx->search_pack_header ? 0xba : 0xe0; + int stuffing, i; + + while (start + len > p) { + q = memchr(p, 0, start + len - p); + if (q == NULL) + break; + p = q + 1; + if ((char *)q + 15 >= buf->buf + buf->bytesused || + q[1] != 0 || q[2] != 1 || q[3] != ch) + continue; + if (!cx->search_pack_header) { + if ((q[6] & 0xc0) != 0x80) + continue; + if (((q[7] & 0xc0) == 0x80 && + (q[9] & 0xf0) == 0x20) || + ((q[7] & 0xc0) == 0xc0 && + (q[9] & 0xf0) == 0x30)) { + ch = 0xba; + cx->search_pack_header = 1; + p = q + 9; + } + continue; + } + stuffing = q[13] & 7; + /* all stuffing bytes must be 0xff */ + for (i = 0; i < stuffing; i++) + if (q[14 + i] != 0xff) + break; + if (i == stuffing && + (q[4] & 0xc4) == 0x44 && + (q[12] & 3) == 3 && + q[14 + stuffing] == 0 && + q[15 + stuffing] == 0 && + q[16 + stuffing] == 1) { + cx->search_pack_header = 0; + len = (char *)q - start; + cx18_setup_sliced_vbi_buf(cx); + break; + } + } + } + if (copy_to_user(ubuf, (u8 *)buf->buf + buf->readpos, len)) { + CX18_DEBUG_WARN("copy %zd bytes to user failed for %s\n", + len, s->name); + return -EFAULT; + } + buf->readpos += len; + if (s->type == CX18_ENC_STREAM_TYPE_MPG && + buf != &cx->vbi.sliced_mpeg_buf) + cx->mpg_data_received += len; + return len; +} + +static ssize_t cx18_read(struct cx18_stream *s, char __user *ubuf, + size_t tot_count, int non_block) +{ + struct cx18 *cx = s->cx; + size_t tot_written = 0; + int single_frame = 0; + + if (atomic_read(&cx->capturing) == 0 && s->id == -1) { + /* shouldn't happen */ + CX18_DEBUG_WARN("Stream %s not initialized before read\n", + s->name); + return -EIO; + } + + /* Each VBI buffer is one frame, the v4l2 API says that for VBI the + frames should arrive one-by-one, so make sure we never output more + than one VBI frame at a time */ + if (s->type == CX18_ENC_STREAM_TYPE_VBI && + cx->vbi.sliced_in->service_set) + single_frame = 1; + + for (;;) { + struct cx18_buffer *buf; + int rc; + + buf = cx18_get_buffer(s, non_block, &rc); + /* if there is no data available... */ + if (buf == NULL) { + /* if we got data, then return that regardless */ + if (tot_written) + break; + /* EOS condition */ + if (rc == 0) { + clear_bit(CX18_F_S_STREAMOFF, &s->s_flags); + clear_bit(CX18_F_S_APPL_IO, &s->s_flags); + cx18_release_stream(s); + } + /* set errno */ + return rc; + } + + rc = cx18_copy_buf_to_user(s, buf, ubuf + tot_written, + tot_count - tot_written); + + if (buf != &cx->vbi.sliced_mpeg_buf) { + if (buf->readpos == buf->bytesused) { + cx18_buf_sync_for_device(s, buf); + cx18_enqueue(s, buf, &s->q_free); + cx18_vapi(cx, CX18_CPU_DE_SET_MDL, 5, + s->handle, + (void *)&cx->scb->cpu_mdl[buf->id] - cx->enc_mem, + 1, buf->id, s->buf_size); + } else + cx18_enqueue(s, buf, &s->q_io); + } else if (buf->readpos == buf->bytesused) { + int idx = cx->vbi.inserted_frame % CX18_VBI_FRAMES; + + cx->vbi.sliced_mpeg_size[idx] = 0; + cx->vbi.inserted_frame++; + cx->vbi_data_inserted += buf->bytesused; + } + if (rc < 0) + return rc; + tot_written += rc; + + if (tot_written == tot_count || single_frame) + break; + } + return tot_written; +} + +static ssize_t cx18_read_pos(struct cx18_stream *s, char __user *ubuf, + size_t count, loff_t *pos, int non_block) +{ + ssize_t rc = count ? cx18_read(s, ubuf, count, non_block) : 0; + struct cx18 *cx = s->cx; + + CX18_DEBUG_HI_FILE("read %zd from %s, got %zd\n", count, s->name, rc); + if (rc > 0) + pos += rc; + return rc; +} + +int cx18_start_capture(struct cx18_open_id *id) +{ + struct cx18 *cx = id->cx; + struct cx18_stream *s = &cx->streams[id->type]; + struct cx18_stream *s_vbi; + + if (s->type == CX18_ENC_STREAM_TYPE_RAD) { + /* you cannot read from these stream types. */ + return -EPERM; + } + + /* Try to claim this stream. */ + if (cx18_claim_stream(id, s->type)) + return -EBUSY; + + /* If capture is already in progress, then we also have to + do nothing extra. */ + if (test_bit(CX18_F_S_STREAMOFF, &s->s_flags) || + test_and_set_bit(CX18_F_S_STREAMING, &s->s_flags)) { + set_bit(CX18_F_S_APPL_IO, &s->s_flags); + return 0; + } + + /* Start VBI capture if required */ + s_vbi = &cx->streams[CX18_ENC_STREAM_TYPE_VBI]; + 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 (s->q_full.length || s->q_io.length) + 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 inode *inode, 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_i2c_clients(cx, VIDIOC_S_STD, &cx->std); + /* Select correct audio input (i.e. TV tuner or Line in) */ + cx18_audio_set_io(cx); + if (atomic_read(&cx->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->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_i2c_clients(cx, AUDC_SET_RADIO, NULL); + /* 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 inode *inode, struct file *filp) +{ + int res, x, y = 0; + struct cx18 *cx = NULL; + struct cx18_stream *s = NULL; + int minor = iminor(inode); + + /* Find which card this open was on */ + spin_lock(&cx18_cards_lock); + for (x = 0; cx == NULL && x < cx18_cards_active; x++) { + /* find out which stream this open was on */ + for (y = 0; y < CX18_MAX_STREAMS; y++) { + s = &cx18_cards[x]->streams[y]; + if (s->v4l2dev && s->v4l2dev->minor == minor) { + cx = cx18_cards[x]; + break; + } + } + } + spin_unlock(&cx18_cards_lock); + + if (cx == NULL) { + /* Couldn't find a device registered + on that minor, shouldn't happen! */ + printk(KERN_WARNING "No cx18 device found on minor %d\n", + minor); + return -ENXIO; + } + + mutex_lock(&cx->serialize_lock); + if (cx18_init_on_first_open(cx)) { + CX18_ERR("Failed to initialize on minor %d\n", 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) +{ + if (atomic_read(&cx->capturing)) + cx18_vapi(cx, CX18_CPU_SET_AUDIO_MUTE, 2, + cx18_find_handle(cx), 1); + CX18_DEBUG_INFO("Mute\n"); +} + +void cx18_unmute(struct cx18 *cx) +{ + if (atomic_read(&cx->capturing)) { + cx18_msleep_timeout(100, 0); + cx18_vapi(cx, CX18_CPU_SET_MISC_PARAMETERS, 2, + cx18_find_handle(cx), 12); + cx18_vapi(cx, CX18_CPU_SET_AUDIO_MUTE, 2, + cx18_find_handle(cx), 0); + } + CX18_DEBUG_INFO("Unmute\n"); +} |