[linux-2.6-block.git] / include / media / v4l2-mc.h

/*
 * v4l2-mc.h - Media Controller V4L2 types and prototypes
 *
 * Copyright (C) 2016 Mauro Carvalho Chehab <mchehab@kernel.org>
 * Copyright (C) 2006-2010 Nokia Corporation
 * Copyright (c) 2016 Intel Corporation.
 *
 * 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.
 */

#ifndef _V4L2_MC_H
#define _V4L2_MC_H

#include <media/media-device.h>
#include <media/v4l2-dev.h>
#include <linux/types.h>

/**
 * enum tuner_pad_index - tuner pad index for MEDIA_ENT_F_TUNER
 *
 * @TUNER_PAD_RF_INPUT:	Radiofrequency (RF) sink pad, usually linked to a
 *			RF connector entity.
 * @TUNER_PAD_OUTPUT:	Tuner video output source pad. Contains the video
 *			chrominance and luminance or the hole bandwidth
 *			of the signal converted to an Intermediate Frequency
 *			(IF) or to baseband (on zero-IF tuners).
 * @TUNER_PAD_AUD_OUT:	Tuner audio output source pad. Tuners used to decode
 *			analog TV signals have an extra pad for audio output.
 *			Old tuners use an analog stage with a saw filter for
 *			the audio IF frequency. The output of the pad is, in
 *			this case, the audio IF, with should be decoded either
 *			by the bridge chipset (that's the case of cx2388x
 *			chipsets) or may require an external IF sound
 *			processor, like msp34xx. On modern silicon tuners,
 *			the audio IF decoder is usually incorporated at the
 *			tuner. On such case, the output of this pad is an
 *			audio sampled data.
 * @TUNER_NUM_PADS:	Number of pads of the tuner.
 */
enum tuner_pad_index {
	TUNER_PAD_RF_INPUT,
	TUNER_PAD_OUTPUT,
	TUNER_PAD_AUD_OUT,
	TUNER_NUM_PADS
};

/**
 * enum if_vid_dec_index - video IF-PLL pad index for
 *			   MEDIA_ENT_F_IF_VID_DECODER
 *
 * @IF_VID_DEC_PAD_IF_INPUT:	video Intermediate Frequency (IF) sink pad
 * @IF_VID_DEC_PAD_OUT:		IF-PLL video output source pad. Contains the
 *				video chrominance and luminance IF signals.
 * @IF_VID_DEC_PAD_NUM_PADS:	Number of pads of the video IF-PLL.
 */
enum if_vid_dec_pad_index {
	IF_VID_DEC_PAD_IF_INPUT,
	IF_VID_DEC_PAD_OUT,
	IF_VID_DEC_PAD_NUM_PADS
};

/**
 * enum if_aud_dec_index - audio/sound IF-PLL pad index for
 *			   MEDIA_ENT_F_IF_AUD_DECODER
 *
 * @IF_AUD_DEC_PAD_IF_INPUT:	audio Intermediate Frequency (IF) sink pad
 * @IF_AUD_DEC_PAD_OUT:		IF-PLL audio output source pad. Contains the
 *				audio sampled stream data, usually connected
 *				to the bridge bus via an Inter-IC Sound (I2S)
 *				bus.
 * @IF_AUD_DEC_PAD_NUM_PADS:	Number of pads of the audio IF-PLL.
 */
enum if_aud_dec_pad_index {
	IF_AUD_DEC_PAD_IF_INPUT,
	IF_AUD_DEC_PAD_OUT,
	IF_AUD_DEC_PAD_NUM_PADS
};

/**
 * enum demod_pad_index - analog TV pad index for MEDIA_ENT_F_ATV_DECODER
 *
 * @DEMOD_PAD_IF_INPUT:	IF input sink pad.
 * @DEMOD_PAD_VID_OUT:	Video output source pad.
 * @DEMOD_PAD_VBI_OUT:	Vertical Blank Interface (VBI) output source pad.
 * @DEMOD_PAD_AUDIO_OUT: Audio output source pad.
 * @DEMOD_NUM_PADS:	Maximum number of output pads.
 */
enum demod_pad_index {
	DEMOD_PAD_IF_INPUT,
	DEMOD_PAD_VID_OUT,
	DEMOD_PAD_VBI_OUT,
	DEMOD_PAD_AUDIO_OUT,
	DEMOD_NUM_PADS
};

/* We don't need to include pci.h or usb.h here */
struct pci_dev;
struct usb_device;

#ifdef CONFIG_MEDIA_CONTROLLER
/**
 * 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.
 */
int v4l2_mc_create_media_graph(struct media_device *mdev);

/**
 * v4l_enable_media_source() -	Hold media source for exclusive use
 *				if free
 *
 * @vdev:	pointer to struct video_device
 *
 * This interface calls enable_source handler to determine if
 * media source is free for use. The enable_source handler is
 * responsible for checking is the media source is free and
 * start a pipeline between the media source and the media
 * entity associated with the video device. This interface
 * should be called from v4l2-core and dvb-core interfaces
 * that change the source configuration.
 *
 * Return: returns zero on success or a negative error code.
 */
int v4l_enable_media_source(struct video_device *vdev);

/**
 * v4l_disable_media_source() -	Release media source
 *
 * @vdev:	pointer to struct video_device
 *
 * This interface calls disable_source handler to release
 * the media source. The disable_source handler stops the
 * active media pipeline between the media source and the
 * media entity associated with the video device.
 *
 * Return: returns zero on success or a negative error code.
 */
void v4l_disable_media_source(struct video_device *vdev);

/*
 * v4l_vb2q_enable_media_tuner -  Hold media source for exclusive use
 *				  if free.
 * @q - pointer to struct vb2_queue
 *
 * Wrapper for v4l_enable_media_source(). This function should
 * be called from v4l2-core to enable the media source with
 * pointer to struct vb2_queue as the input argument. Some
 * v4l2-core interfaces don't have access to video device and
 * this interface finds the struct video_device for the q and
 * calls v4l_enable_media_source().
 */
int v4l_vb2q_enable_media_source(struct vb2_queue *q);


/**
 * v4l2_pipeline_pm_use - Update the use count of an entity
 * @entity: The entity
 * @use: Use (1) or stop using (0) the entity
 *
 * Update the use count of all entities in the pipeline and power entities on or
 * off accordingly.
 *
 * This function is intended to be called in video node open (use ==
 * 1) and release (use == 0). It uses struct media_entity.use_count to
 * track the power status. The use of this function should be paired
 * with v4l2_pipeline_link_notify().
 *
 * Return 0 on success or a negative error code on failure. Powering entities
 * off is assumed to never fail. No failure can occur when the use parameter is
 * set to 0.
 */
int v4l2_pipeline_pm_use(struct media_entity *entity, int use);


/**
 * v4l2_pipeline_link_notify - Link management notification callback
 * @link: The link
 * @flags: New link flags that will be applied
 * @notification: The link's state change notification type (MEDIA_DEV_NOTIFY_*)
 *
 * React to link management on powered pipelines by updating the use count of
 * all entities in the source and sink sides of the link. Entities are powered
 * on or off accordingly. The use of this function should be paired
 * with v4l2_pipeline_pm_use().
 *
 * Return 0 on success or a negative error code on failure. Powering entities
 * off is assumed to never fail. This function will not fail for disconnection
 * events.
 */
int v4l2_pipeline_link_notify(struct media_link *link, u32 flags,
			      unsigned int notification);

#else /* CONFIG_MEDIA_CONTROLLER */

static inline int v4l2_mc_create_media_graph(struct media_device *mdev)
{
	return 0;
}

static inline int v4l_enable_media_source(struct video_device *vdev)
{
	return 0;
}

static inline void v4l_disable_media_source(struct video_device *vdev)
{
}

static inline int v4l_vb2q_enable_media_source(struct vb2_queue *q)
{
	return 0;
}

static inline int v4l2_pipeline_pm_use(struct media_entity *entity, int use)
{
	return 0;
}

static inline int v4l2_pipeline_link_notify(struct media_link *link, u32 flags,
					    unsigned int notification)
{
	return 0;
}

#endif /* CONFIG_MEDIA_CONTROLLER */
#endif /* _V4L2_MC_H */
Commit	Line	Data
6aad127d MCC	1	/*
	2	* v4l2-mc.h - Media Controller V4L2 types and prototypes
	3	*
5dc8a864	4	* Copyright (C) 2016 Mauro Carvalho Chehab <mchehab@kernel.org>
76413791 SA	5	* Copyright (C) 2006-2010 Nokia Corporation
76413791 SA	6	* Copyright (c) 2016 Intel Corporation.
6aad127d MCC	7	*
	8	* This program is free software; you can redistribute it and/or modify
	9	* it under the terms of the GNU General Public License as published by
	10	* the Free Software Foundation; either version 2 of the License, or
	11	* (at your option) any later version.
	12	*
	13	* This program is distributed in the hope that it will be useful,
	14	* but WITHOUT ANY WARRANTY; without even the implied warranty of
	15	* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
	16	* GNU General Public License for more details.
	17	*/
	18
db152276 MCC	19	#ifndef _V4L2_MC_H
	20	#define _V4L2_MC_H
	21
54d0dbac	22	#include <media/media-device.h>
d0a164f5	23	#include <media/v4l2-dev.h>
76413791	24	#include <linux/types.h>
54d0dbac	25
6aad127d MCC	26	/**
	27	* enum tuner_pad_index - tuner pad index for MEDIA_ENT_F_TUNER
	28	*
	29	* @TUNER_PAD_RF_INPUT: Radiofrequency (RF) sink pad, usually linked to a
	30	* RF connector entity.
5c9077ea MCC	31	* @TUNER_PAD_OUTPUT: Tuner video output source pad. Contains the video
	32	* chrominance and luminance or the hole bandwidth
	33	* of the signal converted to an Intermediate Frequency
	34	* (IF) or to baseband (on zero-IF tuners).
	35	* @TUNER_PAD_AUD_OUT: Tuner audio output source pad. Tuners used to decode
	36	* analog TV signals have an extra pad for audio output.
	37	* Old tuners use an analog stage with a saw filter for
	38	* the audio IF frequency. The output of the pad is, in
	39	* this case, the audio IF, with should be decoded either
	40	* by the bridge chipset (that's the case of cx2388x
	41	* chipsets) or may require an external IF sound
	42	* processor, like msp34xx. On modern silicon tuners,
	43	* the audio IF decoder is usually incorporated at the
	44	* tuner. On such case, the output of this pad is an
	45	* audio sampled data.
6aad127d MCC	46	* @TUNER_NUM_PADS: Number of pads of the tuner.
	47	*/
	48	enum tuner_pad_index {
	49	TUNER_PAD_RF_INPUT,
	50	TUNER_PAD_OUTPUT,
5c9077ea	51	TUNER_PAD_AUD_OUT,
6aad127d	52	TUNER_NUM_PADS
5c9077ea	53	};
953a457e MCC	54
	55	/**
	56	* enum if_vid_dec_index - video IF-PLL pad index for
	57	* MEDIA_ENT_F_IF_VID_DECODER
	58	*
	59	* @IF_VID_DEC_PAD_IF_INPUT: video Intermediate Frequency (IF) sink pad
	60	* @IF_VID_DEC_PAD_OUT: IF-PLL video output source pad. Contains the
	61	* video chrominance and luminance IF signals.
	62	* @IF_VID_DEC_PAD_NUM_PADS: Number of pads of the video IF-PLL.
	63	*/
	64	enum if_vid_dec_pad_index {
	65	IF_VID_DEC_PAD_IF_INPUT,
	66	IF_VID_DEC_PAD_OUT,
	67	IF_VID_DEC_PAD_NUM_PADS
	68	};
	69
	70	/**
	71	* enum if_aud_dec_index - audio/sound IF-PLL pad index for
	72	* MEDIA_ENT_F_IF_AUD_DECODER
	73	*
	74	* @IF_AUD_DEC_PAD_IF_INPUT: audio Intermediate Frequency (IF) sink pad
	75	* @IF_AUD_DEC_PAD_OUT: IF-PLL audio output source pad. Contains the
	76	* audio sampled stream data, usually connected
	77	* to the bridge bus via an Inter-IC Sound (I2S)
	78	* bus.
	79	* @IF_AUD_DEC_PAD_NUM_PADS: Number of pads of the audio IF-PLL.
	80	*/
	81	enum if_aud_dec_pad_index {
	82	IF_AUD_DEC_PAD_IF_INPUT,
	83	IF_AUD_DEC_PAD_OUT,
	84	IF_AUD_DEC_PAD_NUM_PADS
	85	};
e4001e95 MCC	86
	87	/**
	88	* enum demod_pad_index - analog TV pad index for MEDIA_ENT_F_ATV_DECODER
	89	*
	90	* @DEMOD_PAD_IF_INPUT: IF input sink pad.
	91	* @DEMOD_PAD_VID_OUT: Video output source pad.
	92	* @DEMOD_PAD_VBI_OUT: Vertical Blank Interface (VBI) output source pad.
bddc4187	93	* @DEMOD_PAD_AUDIO_OUT: Audio output source pad.
e4001e95 MCC	94	* @DEMOD_NUM_PADS: Maximum number of output pads.
	95	*/
	96	enum demod_pad_index {
	97	DEMOD_PAD_IF_INPUT,
	98	DEMOD_PAD_VID_OUT,
	99	DEMOD_PAD_VBI_OUT,
bddc4187	100	DEMOD_PAD_AUDIO_OUT,
e4001e95 MCC	101	DEMOD_NUM_PADS
e4001e95 MCC	102	};
54d0dbac	103
eee7d353 MCC	104	/* We don't need to include pci.h or usb.h here */
	105	struct pci_dev;
	106	struct usb_device;
7047f298 MCC	107
7047f298 MCC	108	#ifdef CONFIG_MEDIA_CONTROLLER
54d0dbac MCC	109	/**
	110	* v4l2_mc_create_media_graph() - create Media Controller links at the graph.
	111	*
	112	* @mdev: pointer to the &media_device struct.
	113	*
	114	* Add links between the entities commonly found on PC customer's hardware at
	115	* the V4L2 side: camera sensors, audio and video PLL-IF decoders, tuners,
	116	* analog TV decoder and I/O entities (video, VBI and Software Defined Radio).
	117	* NOTE: webcams are modelled on a very simple way: the sensor is
	118	* connected directly to the I/O entity. All dirty details, like
	119	* scaler and crop HW are hidden. While such mapping is enough for v4l2
	120	* interface centric PC-consumer's hardware, V4L2 subdev centric camera
	121	* hardware should not use this routine, as it will not build the right graph.
	122	*/
54d0dbac	123	int v4l2_mc_create_media_graph(struct media_device *mdev);
7047f298	124
d0a164f5 SK	125	/**
	126	* v4l_enable_media_source() - Hold media source for exclusive use
	127	* if free
	128	*
4f27dba6	129	* @vdev: pointer to struct video_device
d0a164f5 SK	130	*
	131	* This interface calls enable_source handler to determine if
	132	* media source is free for use. The enable_source handler is
	133	* responsible for checking is the media source is free and
	134	* start a pipeline between the media source and the media
	135	* entity associated with the video device. This interface
	136	* should be called from v4l2-core and dvb-core interfaces
	137	* that change the source configuration.
	138	*
	139	* Return: returns zero on success or a negative error code.
	140	*/
	141	int v4l_enable_media_source(struct video_device *vdev);
	142
	143	/**
	144	* v4l_disable_media_source() - Release media source
	145	*
4f27dba6	146	* @vdev: pointer to struct video_device
d0a164f5 SK	147	*
	148	* This interface calls disable_source handler to release
	149	* the media source. The disable_source handler stops the
	150	* active media pipeline between the media source and the
	151	* media entity associated with the video device.
	152	*
	153	* Return: returns zero on success or a negative error code.
	154	*/
	155	void v4l_disable_media_source(struct video_device *vdev);
	156
	157	/*
	158	* v4l_vb2q_enable_media_tuner - Hold media source for exclusive use
	159	* if free.
	160	* @q - pointer to struct vb2_queue
	161	*
	162	* Wrapper for v4l_enable_media_source(). This function should
	163	* be called from v4l2-core to enable the media source with
	164	* pointer to struct vb2_queue as the input argument. Some
	165	* v4l2-core interfaces don't have access to video device and
	166	* this interface finds the struct video_device for the q and
	167	* calls v4l_enable_media_source().
	168	*/
	169	int v4l_vb2q_enable_media_source(struct vb2_queue *q);
	170
76413791 SA	171
	172	/**
	173	* v4l2_pipeline_pm_use - Update the use count of an entity
	174	* @entity: The entity
	175	* @use: Use (1) or stop using (0) the entity
	176	*
	177	* Update the use count of all entities in the pipeline and power entities on or
	178	* off accordingly.
	179	*
	180	* This function is intended to be called in video node open (use ==
	181	* 1) and release (use == 0). It uses struct media_entity.use_count to
	182	* track the power status. The use of this function should be paired
	183	* with v4l2_pipeline_link_notify().
	184	*
	185	* Return 0 on success or a negative error code on failure. Powering entities
	186	* off is assumed to never fail. No failure can occur when the use parameter is
	187	* set to 0.
	188	*/
	189	int v4l2_pipeline_pm_use(struct media_entity *entity, int use);
	190
	191
	192	/**
	193	* v4l2_pipeline_link_notify - Link management notification callback
	194	* @link: The link
	195	* @flags: New link flags that will be applied
	196	* @notification: The link's state change notification type (MEDIA_DEV_NOTIFY_*)
	197	*
	198	* React to link management on powered pipelines by updating the use count of
	199	* all entities in the source and sink sides of the link. Entities are powered
	200	* on or off accordingly. The use of this function should be paired
	201	* with v4l2_pipeline_pm_use().
	202	*
	203	* Return 0 on success or a negative error code on failure. Powering entities
	204	* off is assumed to never fail. This function will not fail for disconnection
	205	* events.
	206	*/
	207	int v4l2_pipeline_link_notify(struct media_link *link, u32 flags,
	208	unsigned int notification);
	209
a77bf704	210	#else /* CONFIG_MEDIA_CONTROLLER */
d0a164f5	211
54d0dbac MCC	212	static inline int v4l2_mc_create_media_graph(struct media_device *mdev)
	213	{
	214	return 0;
	215	}
7047f298	216
9532e6bb	217	static inline int v4l_enable_media_source(struct video_device *vdev)
d0a164f5 SK	218	{
	219	return 0;
	220	}
	221
9532e6bb	222	static inline void v4l_disable_media_source(struct video_device *vdev)
d0a164f5	223	{
d0a164f5 SK	224	}
d0a164f5 SK	225
9532e6bb	226	static inline int v4l_vb2q_enable_media_source(struct vb2_queue *q)
d0a164f5 SK	227	{
	228	return 0;
	229	}
a77bf704	230
1e89f584	231	static inline int v4l2_pipeline_pm_use(struct media_entity *entity, int use)
a77bf704 MCC	232	{
	233	return 0;
	234	}
	235
1e89f584 HV	236	static inline int v4l2_pipeline_link_notify(struct media_link *link, u32 flags,
1e89f584 HV	237	unsigned int notification)
a77bf704 MCC	238	{
	239	return 0;
	240	}
	241
	242	#endif /* CONFIG_MEDIA_CONTROLLER */
d0a164f5	243	#endif /* _V4L2_MC_H */