| /* |
| * cx18 init/start/stop/exit stream functions |
| * |
| * Derived from ivtv-streams.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-io.h" |
| #include "cx18-fileops.h" |
| #include "cx18-mailbox.h" |
| #include "cx18-i2c.h" |
| #include "cx18-queue.h" |
| #include "cx18-ioctl.h" |
| #include "cx18-streams.h" |
| #include "cx18-cards.h" |
| #include "cx18-scb.h" |
| #include "cx18-av-core.h" |
| #include "cx18-dvb.h" |
| |
| #define CX18_DSP0_INTERRUPT_MASK 0xd0004C |
| |
| static struct file_operations cx18_v4l2_enc_fops = { |
| .owner = THIS_MODULE, |
| .read = cx18_v4l2_read, |
| .open = cx18_v4l2_open, |
| /* FIXME change to video_ioctl2 if serialization lock can be removed */ |
| .ioctl = cx18_v4l2_ioctl, |
| .compat_ioctl = v4l_compat_ioctl32, |
| .release = cx18_v4l2_close, |
| .poll = cx18_v4l2_enc_poll, |
| }; |
| |
| /* offset from 0 to register ts v4l2 minors on */ |
| #define CX18_V4L2_ENC_TS_OFFSET 16 |
| /* offset from 0 to register pcm v4l2 minors on */ |
| #define CX18_V4L2_ENC_PCM_OFFSET 24 |
| /* offset from 0 to register yuv v4l2 minors on */ |
| #define CX18_V4L2_ENC_YUV_OFFSET 32 |
| |
| static struct { |
| const char *name; |
| int vfl_type; |
| int num_offset; |
| int dma; |
| enum v4l2_buf_type buf_type; |
| struct file_operations *fops; |
| } cx18_stream_info[] = { |
| { /* CX18_ENC_STREAM_TYPE_MPG */ |
| "encoder MPEG", |
| VFL_TYPE_GRABBER, 0, |
| PCI_DMA_FROMDEVICE, V4L2_BUF_TYPE_VIDEO_CAPTURE, |
| &cx18_v4l2_enc_fops |
| }, |
| { /* CX18_ENC_STREAM_TYPE_TS */ |
| "TS", |
| VFL_TYPE_GRABBER, -1, |
| PCI_DMA_FROMDEVICE, V4L2_BUF_TYPE_VIDEO_CAPTURE, |
| &cx18_v4l2_enc_fops |
| }, |
| { /* CX18_ENC_STREAM_TYPE_YUV */ |
| "encoder YUV", |
| VFL_TYPE_GRABBER, CX18_V4L2_ENC_YUV_OFFSET, |
| PCI_DMA_FROMDEVICE, V4L2_BUF_TYPE_VIDEO_CAPTURE, |
| &cx18_v4l2_enc_fops |
| }, |
| { /* CX18_ENC_STREAM_TYPE_VBI */ |
| "encoder VBI", |
| VFL_TYPE_VBI, 0, |
| PCI_DMA_FROMDEVICE, V4L2_BUF_TYPE_VBI_CAPTURE, |
| &cx18_v4l2_enc_fops |
| }, |
| { /* CX18_ENC_STREAM_TYPE_PCM */ |
| "encoder PCM audio", |
| VFL_TYPE_GRABBER, CX18_V4L2_ENC_PCM_OFFSET, |
| PCI_DMA_FROMDEVICE, V4L2_BUF_TYPE_PRIVATE, |
| &cx18_v4l2_enc_fops |
| }, |
| { /* CX18_ENC_STREAM_TYPE_IDX */ |
| "encoder IDX", |
| VFL_TYPE_GRABBER, -1, |
| PCI_DMA_FROMDEVICE, V4L2_BUF_TYPE_VIDEO_CAPTURE, |
| &cx18_v4l2_enc_fops |
| }, |
| { /* CX18_ENC_STREAM_TYPE_RAD */ |
| "encoder radio", |
| VFL_TYPE_RADIO, 0, |
| PCI_DMA_NONE, V4L2_BUF_TYPE_PRIVATE, |
| &cx18_v4l2_enc_fops |
| }, |
| }; |
| |
| static void cx18_stream_init(struct cx18 *cx, int type) |
| { |
| struct cx18_stream *s = &cx->streams[type]; |
| struct video_device *dev = s->v4l2dev; |
| u32 max_size = cx->options.megabytes[type] * 1024 * 1024; |
| |
| /* we need to keep v4l2dev, so restore it afterwards */ |
| memset(s, 0, sizeof(*s)); |
| s->v4l2dev = dev; |
| |
| /* initialize cx18_stream fields */ |
| s->cx = cx; |
| s->type = type; |
| s->name = cx18_stream_info[type].name; |
| s->handle = CX18_INVALID_TASK_HANDLE; |
| |
| s->dma = cx18_stream_info[type].dma; |
| s->buf_size = cx->stream_buf_size[type]; |
| if (s->buf_size) |
| s->buffers = max_size / s->buf_size; |
| if (s->buffers > 63) { |
| /* Each stream has a maximum of 63 buffers, |
| ensure we do not exceed that. */ |
| s->buffers = 63; |
| s->buf_size = (max_size / s->buffers) & ~0xfff; |
| } |
| spin_lock_init(&s->qlock); |
| init_waitqueue_head(&s->waitq); |
| s->id = -1; |
| cx18_queue_init(&s->q_free); |
| cx18_queue_init(&s->q_full); |
| cx18_queue_init(&s->q_io); |
| } |
| |
| static int cx18_prep_dev(struct cx18 *cx, int type) |
| { |
| struct cx18_stream *s = &cx->streams[type]; |
| u32 cap = cx->v4l2_cap; |
| int num_offset = cx18_stream_info[type].num_offset; |
| int num = cx->num + cx18_first_minor + num_offset; |
| |
| /* These four fields are always initialized. If v4l2dev == NULL, then |
| this stream is not in use. In that case no other fields but these |
| four can be used. */ |
| s->v4l2dev = NULL; |
| s->cx = cx; |
| s->type = type; |
| s->name = cx18_stream_info[type].name; |
| |
| /* Check whether the radio is supported */ |
| if (type == CX18_ENC_STREAM_TYPE_RAD && !(cap & V4L2_CAP_RADIO)) |
| return 0; |
| |
| /* Check whether VBI is supported */ |
| if (type == CX18_ENC_STREAM_TYPE_VBI && |
| !(cap & (V4L2_CAP_VBI_CAPTURE | V4L2_CAP_SLICED_VBI_CAPTURE))) |
| return 0; |
| |
| /* User explicitly selected 0 buffers for these streams, so don't |
| create them. */ |
| if (cx18_stream_info[type].dma != PCI_DMA_NONE && |
| cx->options.megabytes[type] == 0) { |
| CX18_INFO("Disabled %s device\n", cx18_stream_info[type].name); |
| return 0; |
| } |
| |
| cx18_stream_init(cx, type); |
| |
| if (num_offset == -1) |
| return 0; |
| |
| /* allocate and initialize the v4l2 video device structure */ |
| s->v4l2dev = video_device_alloc(); |
| if (s->v4l2dev == NULL) { |
| CX18_ERR("Couldn't allocate v4l2 video_device for %s\n", |
| s->name); |
| return -ENOMEM; |
| } |
| |
| snprintf(s->v4l2dev->name, sizeof(s->v4l2dev->name), "cx18-%d", |
| cx->num); |
| |
| s->v4l2dev->num = num; |
| s->v4l2dev->parent = &cx->dev->dev; |
| s->v4l2dev->fops = cx18_stream_info[type].fops; |
| s->v4l2dev->release = video_device_release; |
| s->v4l2dev->tvnorms = V4L2_STD_ALL; |
| cx18_set_funcs(s->v4l2dev); |
| return 0; |
| } |
| |
| /* Initialize v4l2 variables and register v4l2 devices */ |
| int cx18_streams_setup(struct cx18 *cx) |
| { |
| int type, ret; |
| |
| /* Setup V4L2 Devices */ |
| for (type = 0; type < CX18_MAX_STREAMS; type++) { |
| /* Prepare device */ |
| ret = cx18_prep_dev(cx, type); |
| if (ret < 0) |
| break; |
| |
| /* Allocate Stream */ |
| ret = cx18_stream_alloc(&cx->streams[type]); |
| if (ret < 0) |
| break; |
| } |
| if (type == CX18_MAX_STREAMS) |
| return 0; |
| |
| /* One or more streams could not be initialized. Clean 'em all up. */ |
| cx18_streams_cleanup(cx, 0); |
| return ret; |
| } |
| |
| static int cx18_reg_dev(struct cx18 *cx, int type) |
| { |
| struct cx18_stream *s = &cx->streams[type]; |
| int vfl_type = cx18_stream_info[type].vfl_type; |
| int num, ret; |
| |
| /* TODO: Shouldn't this be a VFL_TYPE_TRANSPORT or something? |
| * We need a VFL_TYPE_TS defined. |
| */ |
| if (strcmp("TS", s->name) == 0) { |
| /* just return if no DVB is supported */ |
| if ((cx->card->hw_all & CX18_HW_DVB) == 0) |
| return 0; |
| ret = cx18_dvb_register(s); |
| if (ret < 0) { |
| CX18_ERR("DVB failed to register\n"); |
| return ret; |
| } |
| } |
| |
| if (s->v4l2dev == NULL) |
| return 0; |
| |
| num = s->v4l2dev->num; |
| /* card number + user defined offset + device offset */ |
| if (type != CX18_ENC_STREAM_TYPE_MPG) { |
| struct cx18_stream *s_mpg = &cx->streams[CX18_ENC_STREAM_TYPE_MPG]; |
| |
| if (s_mpg->v4l2dev) |
| num = s_mpg->v4l2dev->num + cx18_stream_info[type].num_offset; |
| } |
| |
| /* Register device. First try the desired minor, then any free one. */ |
| ret = video_register_device(s->v4l2dev, vfl_type, num); |
| if (ret < 0) { |
| CX18_ERR("Couldn't register v4l2 device for %s kernel number %d\n", |
| s->name, num); |
| video_device_release(s->v4l2dev); |
| s->v4l2dev = NULL; |
| return ret; |
| } |
| num = s->v4l2dev->num; |
| |
| switch (vfl_type) { |
| case VFL_TYPE_GRABBER: |
| CX18_INFO("Registered device video%d for %s (%d MB)\n", |
| num, s->name, cx->options.megabytes[type]); |
| break; |
| |
| case VFL_TYPE_RADIO: |
| CX18_INFO("Registered device radio%d for %s\n", |
| num, s->name); |
| break; |
| |
| case VFL_TYPE_VBI: |
| if (cx->options.megabytes[type]) |
| CX18_INFO("Registered device vbi%d for %s (%d MB)\n", |
| num, |
| s->name, cx->options.megabytes[type]); |
| else |
| CX18_INFO("Registered device vbi%d for %s\n", |
| num, s->name); |
| break; |
| } |
| |
| return 0; |
| } |
| |
| /* Register v4l2 devices */ |
| int cx18_streams_register(struct cx18 *cx) |
| { |
| int type; |
| int err; |
| int ret = 0; |
| |
| /* Register V4L2 devices */ |
| for (type = 0; type < CX18_MAX_STREAMS; type++) { |
| err = cx18_reg_dev(cx, type); |
| if (err && ret == 0) |
| ret = err; |
| } |
| |
| if (ret == 0) |
| return 0; |
| |
| /* One or more streams could not be initialized. Clean 'em all up. */ |
| cx18_streams_cleanup(cx, 1); |
| return ret; |
| } |
| |
| /* Unregister v4l2 devices */ |
| void cx18_streams_cleanup(struct cx18 *cx, int unregister) |
| { |
| struct video_device *vdev; |
| int type; |
| |
| /* Teardown all streams */ |
| for (type = 0; type < CX18_MAX_STREAMS; type++) { |
| if (cx->streams[type].dvb.enabled) { |
| cx18_dvb_unregister(&cx->streams[type]); |
| cx->streams[type].dvb.enabled = false; |
| } |
| |
| vdev = cx->streams[type].v4l2dev; |
| |
| cx->streams[type].v4l2dev = NULL; |
| if (vdev == NULL) |
| continue; |
| |
| cx18_stream_free(&cx->streams[type]); |
| |
| /* Unregister or release device */ |
| if (unregister) |
| video_unregister_device(vdev); |
| else |
| video_device_release(vdev); |
| } |
| } |
| |
| static void cx18_vbi_setup(struct cx18_stream *s) |
| { |
| struct cx18 *cx = s->cx; |
| int raw = cx->vbi.sliced_in->service_set == 0; |
| u32 data[CX2341X_MBOX_MAX_DATA]; |
| int lines; |
| |
| if (cx->is_60hz) { |
| cx->vbi.count = 12; |
| cx->vbi.start[0] = 10; |
| cx->vbi.start[1] = 273; |
| } else { /* PAL/SECAM */ |
| cx->vbi.count = 18; |
| cx->vbi.start[0] = 6; |
| cx->vbi.start[1] = 318; |
| } |
| |
| /* setup VBI registers */ |
| cx18_av_cmd(cx, VIDIOC_S_FMT, &cx->vbi.in); |
| |
| /* determine number of lines and total number of VBI bytes. |
| A raw line takes 1443 bytes: 2 * 720 + 4 byte frame header - 1 |
| The '- 1' byte is probably an unused U or V byte. Or something... |
| A sliced line takes 51 bytes: 4 byte frame header, 4 byte internal |
| header, 42 data bytes + checksum (to be confirmed) */ |
| if (raw) { |
| lines = cx->vbi.count * 2; |
| } else { |
| lines = cx->is_60hz ? 24 : 38; |
| if (cx->is_60hz) |
| lines += 2; |
| } |
| |
| cx->vbi.enc_size = lines * |
| (raw ? cx->vbi.raw_size : cx->vbi.sliced_size); |
| |
| data[0] = s->handle; |
| /* Lines per field */ |
| data[1] = (lines / 2) | ((lines / 2) << 16); |
| /* bytes per line */ |
| data[2] = (raw ? cx->vbi.raw_size : cx->vbi.sliced_size); |
| /* Every X number of frames a VBI interrupt arrives |
| (frames as in 25 or 30 fps) */ |
| data[3] = 1; |
| /* Setup VBI for the cx25840 digitizer */ |
| if (raw) { |
| data[4] = 0x20602060; |
| data[5] = 0x30703070; |
| } else { |
| data[4] = 0xB0F0B0F0; |
| data[5] = 0xA0E0A0E0; |
| } |
| |
| CX18_DEBUG_INFO("Setup VBI h: %d lines %x bpl %d fr %d %x %x\n", |
| data[0], data[1], data[2], data[3], data[4], data[5]); |
| |
| if (s->type == CX18_ENC_STREAM_TYPE_VBI) |
| cx18_api(cx, CX18_CPU_SET_RAW_VBI_PARAM, 6, data); |
| } |
| |
| int cx18_start_v4l2_encode_stream(struct cx18_stream *s) |
| { |
| u32 data[MAX_MB_ARGUMENTS]; |
| struct cx18 *cx = s->cx; |
| struct list_head *p; |
| int ts = 0; |
| int captype = 0; |
| |
| if (s->v4l2dev == NULL && s->dvb.enabled == 0) |
| return -EINVAL; |
| |
| CX18_DEBUG_INFO("Start encoder stream %s\n", s->name); |
| |
| switch (s->type) { |
| case CX18_ENC_STREAM_TYPE_MPG: |
| captype = CAPTURE_CHANNEL_TYPE_MPEG; |
| cx->mpg_data_received = cx->vbi_data_inserted = 0; |
| cx->dualwatch_jiffies = jiffies; |
| cx->dualwatch_stereo_mode = cx->params.audio_properties & 0x300; |
| cx->search_pack_header = 0; |
| break; |
| |
| case CX18_ENC_STREAM_TYPE_TS: |
| captype = CAPTURE_CHANNEL_TYPE_TS; |
| ts = 1; |
| break; |
| case CX18_ENC_STREAM_TYPE_YUV: |
| captype = CAPTURE_CHANNEL_TYPE_YUV; |
| break; |
| case CX18_ENC_STREAM_TYPE_PCM: |
| captype = CAPTURE_CHANNEL_TYPE_PCM; |
| break; |
| case CX18_ENC_STREAM_TYPE_VBI: |
| captype = cx->vbi.sliced_in->service_set ? |
| CAPTURE_CHANNEL_TYPE_SLICED_VBI : CAPTURE_CHANNEL_TYPE_VBI; |
| cx->vbi.frame = 0; |
| cx->vbi.inserted_frame = 0; |
| memset(cx->vbi.sliced_mpeg_size, |
| 0, sizeof(cx->vbi.sliced_mpeg_size)); |
| break; |
| default: |
| return -EINVAL; |
| } |
| |
| /* mute/unmute video */ |
| cx18_vapi(cx, CX18_CPU_SET_VIDEO_MUTE, 2, |
| s->handle, !!test_bit(CX18_F_I_RADIO_USER, &cx->i_flags)); |
| |
| /* Clear Streamoff flags in case left from last capture */ |
| clear_bit(CX18_F_S_STREAMOFF, &s->s_flags); |
| |
| cx18_vapi_result(cx, data, CX18_CREATE_TASK, 1, CPU_CMD_MASK_CAPTURE); |
| s->handle = data[0]; |
| cx18_vapi(cx, CX18_CPU_SET_CHANNEL_TYPE, 2, s->handle, captype); |
| |
| if (atomic_read(&cx->ana_capturing) == 0 && !ts) { |
| /* Stuff from Windows, we don't know what it is */ |
| cx18_vapi(cx, CX18_CPU_SET_VER_CROP_LINE, 2, s->handle, 0); |
| cx18_vapi(cx, CX18_CPU_SET_MISC_PARAMETERS, 3, s->handle, 3, 1); |
| cx18_vapi(cx, CX18_CPU_SET_MISC_PARAMETERS, 3, s->handle, 8, 0); |
| cx18_vapi(cx, CX18_CPU_SET_MISC_PARAMETERS, 3, s->handle, 4, 1); |
| cx18_vapi(cx, CX18_CPU_SET_MISC_PARAMETERS, 2, s->handle, 12); |
| |
| cx18_vapi(cx, CX18_CPU_SET_CAPTURE_LINE_NO, 3, |
| s->handle, cx->digitizer, cx->digitizer); |
| |
| /* Setup VBI */ |
| if (cx->v4l2_cap & V4L2_CAP_VBI_CAPTURE) |
| cx18_vbi_setup(s); |
| |
| /* assign program index info. |
| Mask 7: select I/P/B, Num_req: 400 max */ |
| cx18_vapi_result(cx, data, CX18_CPU_SET_INDEXTABLE, 1, 0); |
| |
| /* Setup API for Stream */ |
| cx2341x_update(cx, cx18_api_func, NULL, &cx->params); |
| } |
| |
| if (atomic_read(&cx->tot_capturing) == 0) { |
| clear_bit(CX18_F_I_EOS, &cx->i_flags); |
| cx18_write_reg(cx, 7, CX18_DSP0_INTERRUPT_MASK); |
| } |
| |
| cx18_vapi(cx, CX18_CPU_DE_SET_MDL_ACK, 3, s->handle, |
| (void __iomem *)&cx->scb->cpu_mdl_ack[s->type][0] - cx->enc_mem, |
| (void __iomem *)&cx->scb->cpu_mdl_ack[s->type][1] - cx->enc_mem); |
| |
| list_for_each(p, &s->q_free.list) { |
| struct cx18_buffer *buf = list_entry(p, struct cx18_buffer, list); |
| |
| cx18_writel(cx, buf->dma_handle, |
| &cx->scb->cpu_mdl[buf->id].paddr); |
| cx18_writel(cx, s->buf_size, &cx->scb->cpu_mdl[buf->id].length); |
| cx18_vapi(cx, CX18_CPU_DE_SET_MDL, 5, s->handle, |
| (void __iomem *)&cx->scb->cpu_mdl[buf->id] - cx->enc_mem, |
| 1, buf->id, s->buf_size); |
| } |
| /* begin_capture */ |
| if (cx18_vapi(cx, CX18_CPU_CAPTURE_START, 1, s->handle)) { |
| CX18_DEBUG_WARN("Error starting capture!\n"); |
| /* Ensure we're really not capturing before releasing MDLs */ |
| if (s->type == CX18_ENC_STREAM_TYPE_MPG) |
| cx18_vapi(cx, CX18_CPU_CAPTURE_STOP, 2, s->handle, 1); |
| else |
| cx18_vapi(cx, CX18_CPU_CAPTURE_STOP, 1, s->handle); |
| cx18_vapi(cx, CX18_CPU_DE_RELEASE_MDL, 1, s->handle); |
| cx18_vapi(cx, CX18_DESTROY_TASK, 1, s->handle); |
| /* FIXME - clean-up DSP0_INT mask, i_flags, s_flags, etc. */ |
| return -EINVAL; |
| } |
| |
| /* you're live! sit back and await interrupts :) */ |
| if (!ts) |
| atomic_inc(&cx->ana_capturing); |
| atomic_inc(&cx->tot_capturing); |
| return 0; |
| } |
| |
| void cx18_stop_all_captures(struct cx18 *cx) |
| { |
| int i; |
| |
| for (i = CX18_MAX_STREAMS - 1; i >= 0; i--) { |
| struct cx18_stream *s = &cx->streams[i]; |
| |
| if (s->v4l2dev == NULL && s->dvb.enabled == 0) |
| continue; |
| if (test_bit(CX18_F_S_STREAMING, &s->s_flags)) |
| cx18_stop_v4l2_encode_stream(s, 0); |
| } |
| } |
| |
| int cx18_stop_v4l2_encode_stream(struct cx18_stream *s, int gop_end) |
| { |
| struct cx18 *cx = s->cx; |
| unsigned long then; |
| |
| if (s->v4l2dev == NULL && s->dvb.enabled == 0) |
| return -EINVAL; |
| |
| /* This function assumes that you are allowed to stop the capture |
| and that we are actually capturing */ |
| |
| CX18_DEBUG_INFO("Stop Capture\n"); |
| |
| if (atomic_read(&cx->tot_capturing) == 0) |
| return 0; |
| |
| if (s->type == CX18_ENC_STREAM_TYPE_MPG) |
| cx18_vapi(cx, CX18_CPU_CAPTURE_STOP, 2, s->handle, !gop_end); |
| else |
| cx18_vapi(cx, CX18_CPU_CAPTURE_STOP, 1, s->handle); |
| |
| then = jiffies; |
| |
| if (s->type == CX18_ENC_STREAM_TYPE_MPG && gop_end) { |
| CX18_INFO("ignoring gop_end: not (yet?) supported by the firmware\n"); |
| } |
| |
| if (s->type != CX18_ENC_STREAM_TYPE_TS) |
| atomic_dec(&cx->ana_capturing); |
| atomic_dec(&cx->tot_capturing); |
| |
| /* Clear capture and no-read bits */ |
| clear_bit(CX18_F_S_STREAMING, &s->s_flags); |
| |
| /* Tell the CX23418 it can't use our buffers anymore */ |
| cx18_vapi(cx, CX18_CPU_DE_RELEASE_MDL, 1, s->handle); |
| |
| cx18_vapi(cx, CX18_DESTROY_TASK, 1, s->handle); |
| s->handle = CX18_INVALID_TASK_HANDLE; |
| |
| if (atomic_read(&cx->tot_capturing) > 0) |
| return 0; |
| |
| cx18_write_reg(cx, 5, CX18_DSP0_INTERRUPT_MASK); |
| wake_up(&s->waitq); |
| |
| return 0; |
| } |
| |
| u32 cx18_find_handle(struct cx18 *cx) |
| { |
| int i; |
| |
| /* find first available handle to be used for global settings */ |
| for (i = 0; i < CX18_MAX_STREAMS; i++) { |
| struct cx18_stream *s = &cx->streams[i]; |
| |
| if (s->v4l2dev && (s->handle != CX18_INVALID_TASK_HANDLE)) |
| return s->handle; |
| } |
| return CX18_INVALID_TASK_HANDLE; |
| } |
| |
| struct cx18_stream *cx18_handle_to_stream(struct cx18 *cx, u32 handle) |
| { |
| int i; |
| struct cx18_stream *s; |
| |
| if (handle == CX18_INVALID_TASK_HANDLE) |
| return NULL; |
| |
| for (i = 0; i < CX18_MAX_STREAMS; i++) { |
| s = &cx->streams[i]; |
| if (s->handle != handle) |
| continue; |
| if (s->v4l2dev || s->dvb.enabled) |
| return s; |
| } |
| return NULL; |
| } |