diff options
| -rw-r--r-- | drivers/media/v4l2-core/Makefile | 1 | ||||
| -rw-r--r-- | drivers/media/v4l2-core/v4l2-mc.c | 186 | ||||
| -rw-r--r-- | include/media/v4l2-mc.h | 25 |
3 files changed, 212 insertions, 0 deletions
diff --git a/drivers/media/v4l2-core/Makefile b/drivers/media/v4l2-core/Makefile index 1dc8bba2b198..795a5352761d 100644 --- a/drivers/media/v4l2-core/Makefile +++ b/drivers/media/v4l2-core/Makefile @@ -16,6 +16,7 @@ endif ifeq ($(CONFIG_TRACEPOINTS),y) videodev-objs += vb2-trace.o v4l2-trace.o endif +videodev-$(CONFIG_MEDIA_CONTROLLER) += v4l2-mc.o obj-$(CONFIG_VIDEO_V4L2) += videodev.o obj-$(CONFIG_VIDEO_V4L2) += v4l2-common.o diff --git a/drivers/media/v4l2-core/v4l2-mc.c b/drivers/media/v4l2-core/v4l2-mc.c new file mode 100644 index 000000000000..e6d2a711bb0b --- /dev/null +++ b/drivers/media/v4l2-core/v4l2-mc.c @@ -0,0 +1,186 @@ +/* + * Media Controller ancillary functions + * + * (c) 2016 Mauro Carvalho Chehab <mchehab@osg.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; 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 <linux/module.h> +#include <media/media-entity.h> +#include <media/v4l2-mc.h> + +int v4l2_mc_create_media_graph(struct media_device *mdev) + +{ + struct media_entity *entity; + struct media_entity *if_vid = NULL, *if_aud = NULL, *sensor = NULL; + struct media_entity *tuner = NULL, *decoder = NULL; + struct media_entity *io_v4l = NULL, *io_vbi = NULL, *io_swradio = NULL; + bool is_webcam = false; + u32 flags; + int ret; + + if (!mdev) + return 0; + + media_device_for_each_entity(entity, mdev) { + switch (entity->function) { + case MEDIA_ENT_F_IF_VID_DECODER: + if_vid = entity; + break; + case MEDIA_ENT_F_IF_AUD_DECODER: + if_aud = entity; + break; + case MEDIA_ENT_F_TUNER: + tuner = entity; + break; + case MEDIA_ENT_F_ATV_DECODER: + decoder = entity; + break; + case MEDIA_ENT_F_IO_V4L: + io_v4l = entity; + break; + case MEDIA_ENT_F_IO_VBI: + io_vbi = entity; + break; + case MEDIA_ENT_F_IO_SWRADIO: + io_swradio = entity; + break; + case MEDIA_ENT_F_CAM_SENSOR: + sensor = entity; + is_webcam = true; + break; + } + } + + /* It should have at least one I/O entity */ + if (!io_v4l && !io_vbi && !io_swradio) + return -EINVAL; + + /* + * Here, webcams are modelled on a very simple way: the sensor is + * connected directly to the I/O entity. All dirty details, like + * scaler and crop HW are hidden. While such mapping is not enough + * for mc-centric hardware, it is enough for v4l2 interface centric + * PC-consumer's hardware. + */ + if (is_webcam) { + if (!io_v4l) + return -EINVAL; + + media_device_for_each_entity(entity, mdev) { + if (entity->function != MEDIA_ENT_F_CAM_SENSOR) + continue; + ret = media_create_pad_link(entity, 0, + io_v4l, 0, + MEDIA_LNK_FL_ENABLED); + if (ret) + return ret; + } + if (!decoder) + return 0; + } + + /* The device isn't a webcam. So, it should have a decoder */ + if (!decoder) + return -EINVAL; + + /* Link the tuner and IF video output pads */ + if (tuner) { + if (if_vid) { + ret = media_create_pad_link(tuner, TUNER_PAD_OUTPUT, + if_vid, + IF_VID_DEC_PAD_IF_INPUT, + MEDIA_LNK_FL_ENABLED); + if (ret) + return ret; + ret = media_create_pad_link(if_vid, IF_VID_DEC_PAD_OUT, + decoder, DEMOD_PAD_IF_INPUT, + MEDIA_LNK_FL_ENABLED); + if (ret) + return ret; + } else { + ret = media_create_pad_link(tuner, TUNER_PAD_OUTPUT, + decoder, DEMOD_PAD_IF_INPUT, + MEDIA_LNK_FL_ENABLED); + if (ret) + return ret; + } + + if (if_aud) { + ret = media_create_pad_link(tuner, TUNER_PAD_AUD_OUT, + if_aud, + IF_AUD_DEC_PAD_IF_INPUT, + MEDIA_LNK_FL_ENABLED); + if (ret) + return ret; + } else { + if_aud = tuner; + } + + } + + /* Create demod to V4L, VBI and SDR radio links */ + if (io_v4l) { + ret = media_create_pad_link(decoder, DEMOD_PAD_VID_OUT, + io_v4l, 0, + MEDIA_LNK_FL_ENABLED); + if (ret) + return ret; + } + + if (io_swradio) { + ret = media_create_pad_link(decoder, DEMOD_PAD_VID_OUT, + io_swradio, 0, + MEDIA_LNK_FL_ENABLED); + if (ret) + return ret; + } + + if (io_vbi) { + ret = media_create_pad_link(decoder, DEMOD_PAD_VBI_OUT, + io_vbi, 0, + MEDIA_LNK_FL_ENABLED); + if (ret) + return ret; + } + + /* Create links for the media connectors */ + flags = MEDIA_LNK_FL_ENABLED; + media_device_for_each_entity(entity, mdev) { + switch (entity->function) { + case MEDIA_ENT_F_CONN_RF: + if (!tuner) + continue; + + ret = media_create_pad_link(entity, 0, tuner, + TUNER_PAD_RF_INPUT, + flags); + break; + case MEDIA_ENT_F_CONN_SVIDEO: + case MEDIA_ENT_F_CONN_COMPOSITE: + case MEDIA_ENT_F_CONN_TEST: + ret = media_create_pad_link(entity, 0, decoder, + DEMOD_PAD_IF_INPUT, + flags); + break; + default: + continue; + } + if (ret) + return ret; + + flags = 0; + } + return 0; +} +EXPORT_SYMBOL_GPL(v4l2_mc_create_media_graph); diff --git a/include/media/v4l2-mc.h b/include/media/v4l2-mc.h index df115195690e..aed9e9b87f82 100644 --- a/include/media/v4l2-mc.h +++ b/include/media/v4l2-mc.h @@ -14,6 +14,8 @@ * GNU General Public License for more details. */ +#include <media/media-device.h> + /** * enum tuner_pad_index - tuner pad index for MEDIA_ENT_F_TUNER * @@ -89,3 +91,26 @@ enum demod_pad_index { DEMOD_PAD_VBI_OUT, DEMOD_NUM_PADS }; + +/** + * v4l2_mc_create_media_graph() - create Media Controller links at the graph. + * + * @mdev: pointer to the &media_device struct. + * + * Add links between the entities commonly found on PC customer's hardware at + * the V4L2 side: camera sensors, audio and video PLL-IF decoders, tuners, + * analog TV decoder and I/O entities (video, VBI and Software Defined Radio). + * NOTE: webcams are modelled on a very simple way: the sensor is + * connected directly to the I/O entity. All dirty details, like + * scaler and crop HW are hidden. While such mapping is enough for v4l2 + * interface centric PC-consumer's hardware, V4L2 subdev centric camera + * hardware should not use this routine, as it will not build the right graph. + */ +#ifdef CONFIG_MEDIA_CONTROLLER +int v4l2_mc_create_media_graph(struct media_device *mdev); +#else +static inline int v4l2_mc_create_media_graph(struct media_device *mdev) +{ + return 0; +} +#endif |