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![Guennadi Liakhovetski](/assets/img/avatar_default.png)
Video subdevices, like cameras, decoders, connect to video bridges over specialised busses. Data is being transferred over these busses in various formats, which only loosely correspond to fourcc codes, describing how video data is stored in RAM. This is not a one-to-one correspondence, therefore we cannot use fourcc codes to configure subdevice output data formats. This patch adds codes for several such on-the-bus formats and an API, similar to the familiar .s_fmt(), .g_fmt(), .try_fmt(), .enum_fmt() API for configuring those codes. After all users of the old API in struct v4l2_subdev_video_ops are converted, it will be removed. Also add helper routines to support generic pass-through mode for the soc-camera framework. create mode 100644 drivers/media/video/soc_mediabus.c create mode 100644 include/media/soc_mediabus.h create mode 100644 include/media/v4l2-mediabus.h Signed-off-by: Guennadi Liakhovetski <g.liakhovetski@gmx.de> Acked-by: Hans Verkuil <hverkuil@xs4all.nl> Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>
445 lines
18 KiB
C++
445 lines
18 KiB
C++
/*
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V4L2 sub-device support header.
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Copyright (C) 2008 Hans Verkuil <hverkuil@xs4all.nl>
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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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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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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 02111-1307 USA
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*/
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#ifndef _V4L2_SUBDEV_H
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#define _V4L2_SUBDEV_H
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#include <media/v4l2-common.h>
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#include <media/v4l2-mediabus.h>
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/* generic v4l2_device notify callback notification values */
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#define V4L2_SUBDEV_IR_RX_NOTIFY _IOW('v', 0, u32)
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#define V4L2_SUBDEV_IR_RX_FIFO_SERVICE_REQ 0x00000001
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#define V4L2_SUBDEV_IR_RX_END_OF_RX_DETECTED 0x00000002
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#define V4L2_SUBDEV_IR_RX_HW_FIFO_OVERRUN 0x00000004
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#define V4L2_SUBDEV_IR_RX_SW_FIFO_OVERRUN 0x00000008
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#define V4L2_SUBDEV_IR_TX_NOTIFY _IOW('v', 1, u32)
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#define V4L2_SUBDEV_IR_TX_FIFO_SERVICE_REQ 0x00000001
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struct v4l2_device;
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struct v4l2_subdev;
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struct tuner_setup;
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/* decode_vbi_line */
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struct v4l2_decode_vbi_line {
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u32 is_second_field; /* Set to 0 for the first (odd) field,
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set to 1 for the second (even) field. */
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u8 *p; /* Pointer to the sliced VBI data from the decoder.
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On exit points to the start of the payload. */
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u32 line; /* Line number of the sliced VBI data (1-23) */
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u32 type; /* VBI service type (V4L2_SLICED_*). 0 if no service found */
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};
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/* Sub-devices are devices that are connected somehow to the main bridge
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device. These devices are usually audio/video muxers/encoders/decoders or
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sensors and webcam controllers.
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Usually these devices are controlled through an i2c bus, but other busses
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may also be used.
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The v4l2_subdev struct provides a way of accessing these devices in a
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generic manner. Most operations that these sub-devices support fall in
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a few categories: core ops, audio ops, video ops and tuner ops.
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More categories can be added if needed, although this should remain a
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limited set (no more than approx. 8 categories).
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Each category has its own set of ops that subdev drivers can implement.
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A subdev driver can leave the pointer to the category ops NULL if
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it does not implement them (e.g. an audio subdev will generally not
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implement the video category ops). The exception is the core category:
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this must always be present.
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These ops are all used internally so it is no problem to change, remove
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or add ops or move ops from one to another category. Currently these
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ops are based on the original ioctls, but since ops are not limited to
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one argument there is room for improvement here once all i2c subdev
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drivers are converted to use these ops.
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*/
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/* Core ops: it is highly recommended to implement at least these ops:
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g_chip_ident
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log_status
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g_register
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s_register
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This provides basic debugging support.
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The ioctl ops is meant for generic ioctl-like commands. Depending on
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the use-case it might be better to use subdev-specific ops (currently
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not yet implemented) since ops provide proper type-checking.
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*/
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/* s_config: if set, then it is always called by the v4l2_i2c_new_subdev*
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functions after the v4l2_subdev was registered. It is used to pass
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platform data to the subdev which can be used during initialization.
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init: initialize the sensor registors to some sort of reasonable default
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values. Do not use for new drivers and should be removed in existing
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drivers.
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load_fw: load firmware.
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reset: generic reset command. The argument selects which subsystems to
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reset. Passing 0 will always reset the whole chip. Do not use for new
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drivers without discussing this first on the linux-media mailinglist.
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There should be no reason normally to reset a device.
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s_gpio: set GPIO pins. Very simple right now, might need to be extended with
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a direction argument if needed.
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s_power: puts subdevice in power saving mode (on == 0) or normal operation
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mode (on == 1).
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*/
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struct v4l2_subdev_core_ops {
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int (*g_chip_ident)(struct v4l2_subdev *sd, struct v4l2_dbg_chip_ident *chip);
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int (*log_status)(struct v4l2_subdev *sd);
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int (*s_config)(struct v4l2_subdev *sd, int irq, void *platform_data);
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int (*init)(struct v4l2_subdev *sd, u32 val);
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int (*load_fw)(struct v4l2_subdev *sd);
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int (*reset)(struct v4l2_subdev *sd, u32 val);
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int (*s_gpio)(struct v4l2_subdev *sd, u32 val);
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int (*queryctrl)(struct v4l2_subdev *sd, struct v4l2_queryctrl *qc);
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int (*g_ctrl)(struct v4l2_subdev *sd, struct v4l2_control *ctrl);
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int (*s_ctrl)(struct v4l2_subdev *sd, struct v4l2_control *ctrl);
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int (*g_ext_ctrls)(struct v4l2_subdev *sd, struct v4l2_ext_controls *ctrls);
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int (*s_ext_ctrls)(struct v4l2_subdev *sd, struct v4l2_ext_controls *ctrls);
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int (*try_ext_ctrls)(struct v4l2_subdev *sd, struct v4l2_ext_controls *ctrls);
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int (*querymenu)(struct v4l2_subdev *sd, struct v4l2_querymenu *qm);
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int (*s_std)(struct v4l2_subdev *sd, v4l2_std_id norm);
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long (*ioctl)(struct v4l2_subdev *sd, unsigned int cmd, void *arg);
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#ifdef CONFIG_VIDEO_ADV_DEBUG
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int (*g_register)(struct v4l2_subdev *sd, struct v4l2_dbg_register *reg);
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int (*s_register)(struct v4l2_subdev *sd, struct v4l2_dbg_register *reg);
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#endif
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int (*s_power)(struct v4l2_subdev *sd, int on);
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};
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/* s_mode: switch the tuner to a specific tuner mode. Replacement of s_radio.
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s_radio: v4l device was opened in Radio mode, to be replaced by s_mode.
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s_type_addr: sets tuner type and its I2C addr.
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s_config: sets tda9887 specific stuff, like port1, port2 and qss
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*/
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struct v4l2_subdev_tuner_ops {
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int (*s_mode)(struct v4l2_subdev *sd, enum v4l2_tuner_type);
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int (*s_radio)(struct v4l2_subdev *sd);
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int (*s_frequency)(struct v4l2_subdev *sd, struct v4l2_frequency *freq);
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int (*g_frequency)(struct v4l2_subdev *sd, struct v4l2_frequency *freq);
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int (*g_tuner)(struct v4l2_subdev *sd, struct v4l2_tuner *vt);
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int (*s_tuner)(struct v4l2_subdev *sd, struct v4l2_tuner *vt);
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int (*g_modulator)(struct v4l2_subdev *sd, struct v4l2_modulator *vm);
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int (*s_modulator)(struct v4l2_subdev *sd, struct v4l2_modulator *vm);
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int (*s_type_addr)(struct v4l2_subdev *sd, struct tuner_setup *type);
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int (*s_config)(struct v4l2_subdev *sd, const struct v4l2_priv_tun_config *config);
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};
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/* s_clock_freq: set the frequency (in Hz) of the audio clock output.
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Used to slave an audio processor to the video decoder, ensuring that
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audio and video remain synchronized. Usual values for the frequency
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are 48000, 44100 or 32000 Hz. If the frequency is not supported, then
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-EINVAL is returned.
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s_i2s_clock_freq: sets I2S speed in bps. This is used to provide a standard
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way to select I2S clock used by driving digital audio streams at some
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board designs. Usual values for the frequency are 1024000 and 2048000.
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If the frequency is not supported, then -EINVAL is returned.
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s_routing: used to define the input and/or output pins of an audio chip,
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and any additional configuration data.
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Never attempt to use user-level input IDs (e.g. Composite, S-Video,
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Tuner) at this level. An i2c device shouldn't know about whether an
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input pin is connected to a Composite connector, become on another
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board or platform it might be connected to something else entirely.
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The calling driver is responsible for mapping a user-level input to
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the right pins on the i2c device.
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*/
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struct v4l2_subdev_audio_ops {
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int (*s_clock_freq)(struct v4l2_subdev *sd, u32 freq);
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int (*s_i2s_clock_freq)(struct v4l2_subdev *sd, u32 freq);
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int (*s_routing)(struct v4l2_subdev *sd, u32 input, u32 output, u32 config);
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};
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/*
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decode_vbi_line: video decoders that support sliced VBI need to implement
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this ioctl. Field p of the v4l2_sliced_vbi_line struct is set to the
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start of the VBI data that was generated by the decoder. The driver
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then parses the sliced VBI data and sets the other fields in the
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struct accordingly. The pointer p is updated to point to the start of
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the payload which can be copied verbatim into the data field of the
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v4l2_sliced_vbi_data struct. If no valid VBI data was found, then the
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type field is set to 0 on return.
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s_vbi_data: used to generate VBI signals on a video signal.
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v4l2_sliced_vbi_data is filled with the data packets that should be
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output. Note that if you set the line field to 0, then that VBI signal
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is disabled. If no valid VBI data was found, then the type field is
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set to 0 on return.
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g_vbi_data: used to obtain the sliced VBI packet from a readback register.
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Not all video decoders support this. If no data is available because
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the readback register contains invalid or erroneous data -EIO is
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returned. Note that you must fill in the 'id' member and the 'field'
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member (to determine whether CC data from the first or second field
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should be obtained).
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s_std_output: set v4l2_std_id for video OUTPUT devices. This is ignored by
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video input devices.
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s_crystal_freq: sets the frequency of the crystal used to generate the
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clocks in Hz. An extra flags field allows device specific configuration
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regarding clock frequency dividers, etc. If not used, then set flags
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to 0. If the frequency is not supported, then -EINVAL is returned.
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g_input_status: get input status. Same as the status field in the v4l2_input
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struct.
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s_routing: see s_routing in audio_ops, except this version is for video
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devices.
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s_dv_preset: set dv (Digital Video) preset in the sub device. Similar to
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s_std()
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query_dv_preset: query dv preset in the sub device. This is similar to
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querystd()
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s_dv_timings(): Set custom dv timings in the sub device. This is used
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when sub device is capable of setting detailed timing information
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in the hardware to generate/detect the video signal.
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g_dv_timings(): Get custom dv timings in the sub device.
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enum_mbus_fmt: enumerate pixel formats, provided by a video data source
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g_mbus_fmt: get the current pixel format, provided by a video data source
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try_mbus_fmt: try to set a pixel format on a video data source
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s_mbus_fmt: set a pixel format on a video data source
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*/
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struct v4l2_subdev_video_ops {
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int (*s_routing)(struct v4l2_subdev *sd, u32 input, u32 output, u32 config);
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int (*s_crystal_freq)(struct v4l2_subdev *sd, u32 freq, u32 flags);
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int (*decode_vbi_line)(struct v4l2_subdev *sd, struct v4l2_decode_vbi_line *vbi_line);
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int (*s_vbi_data)(struct v4l2_subdev *sd, const struct v4l2_sliced_vbi_data *vbi_data);
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int (*g_vbi_data)(struct v4l2_subdev *sd, struct v4l2_sliced_vbi_data *vbi_data);
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int (*g_sliced_vbi_cap)(struct v4l2_subdev *sd, struct v4l2_sliced_vbi_cap *cap);
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int (*s_std_output)(struct v4l2_subdev *sd, v4l2_std_id std);
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int (*querystd)(struct v4l2_subdev *sd, v4l2_std_id *std);
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int (*g_input_status)(struct v4l2_subdev *sd, u32 *status);
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int (*s_stream)(struct v4l2_subdev *sd, int enable);
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int (*enum_fmt)(struct v4l2_subdev *sd, struct v4l2_fmtdesc *fmtdesc);
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int (*g_fmt)(struct v4l2_subdev *sd, struct v4l2_format *fmt);
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int (*try_fmt)(struct v4l2_subdev *sd, struct v4l2_format *fmt);
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int (*s_fmt)(struct v4l2_subdev *sd, struct v4l2_format *fmt);
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int (*cropcap)(struct v4l2_subdev *sd, struct v4l2_cropcap *cc);
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int (*g_crop)(struct v4l2_subdev *sd, struct v4l2_crop *crop);
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int (*s_crop)(struct v4l2_subdev *sd, struct v4l2_crop *crop);
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int (*g_parm)(struct v4l2_subdev *sd, struct v4l2_streamparm *param);
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int (*s_parm)(struct v4l2_subdev *sd, struct v4l2_streamparm *param);
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int (*enum_framesizes)(struct v4l2_subdev *sd, struct v4l2_frmsizeenum *fsize);
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int (*enum_frameintervals)(struct v4l2_subdev *sd, struct v4l2_frmivalenum *fival);
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int (*s_dv_preset)(struct v4l2_subdev *sd,
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struct v4l2_dv_preset *preset);
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int (*query_dv_preset)(struct v4l2_subdev *sd,
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struct v4l2_dv_preset *preset);
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int (*s_dv_timings)(struct v4l2_subdev *sd,
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struct v4l2_dv_timings *timings);
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int (*g_dv_timings)(struct v4l2_subdev *sd,
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struct v4l2_dv_timings *timings);
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int (*enum_mbus_fmt)(struct v4l2_subdev *sd, int index,
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enum v4l2_mbus_pixelcode *code);
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int (*g_mbus_fmt)(struct v4l2_subdev *sd,
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struct v4l2_mbus_framefmt *fmt);
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int (*try_mbus_fmt)(struct v4l2_subdev *sd,
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struct v4l2_mbus_framefmt *fmt);
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int (*s_mbus_fmt)(struct v4l2_subdev *sd,
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struct v4l2_mbus_framefmt *fmt);
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};
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/**
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* struct v4l2_subdev_sensor_ops - v4l2-subdev sensor operations
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* @g_skip_top_lines: number of lines at the top of the image to be skipped.
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* This is needed for some sensors, which always corrupt
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* several top lines of the output image, or which send their
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* metadata in them.
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*/
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struct v4l2_subdev_sensor_ops {
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int (*g_skip_top_lines)(struct v4l2_subdev *sd, u32 *lines);
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};
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/*
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interrupt_service_routine: Called by the bridge chip's interrupt service
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handler, when an IR interrupt status has be raised due to this subdev,
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so that this subdev can handle the details. It may schedule work to be
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performed later. It must not sleep. *Called from an IRQ context*.
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[rt]x_g_parameters: Get the current operating parameters and state of the
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the IR receiver or transmitter.
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[rt]x_s_parameters: Set the current operating parameters and state of the
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the IR receiver or transmitter. It is recommended to call
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[rt]x_g_parameters first to fill out the current state, and only change
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the fields that need to be changed. Upon return, the actual device
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operating parameters and state will be returned. Note that hardware
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limitations may prevent the actual settings from matching the requested
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settings - e.g. an actual carrier setting of 35,904 Hz when 36,000 Hz
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was requested. An exception is when the shutdown parameter is true.
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The last used operational parameters will be returned, but the actual
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state of the hardware be different to minimize power consumption and
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processing when shutdown is true.
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rx_read: Reads received codes or pulse width data.
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The semantics are similar to a non-blocking read() call.
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tx_write: Writes codes or pulse width data for transmission.
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The semantics are similar to a non-blocking write() call.
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*/
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enum v4l2_subdev_ir_mode {
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V4L2_SUBDEV_IR_MODE_PULSE_WIDTH, /* space & mark widths in nanosecs */
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};
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/* Data format of data read or written for V4L2_SUBDEV_IR_MODE_PULSE_WIDTH */
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#define V4L2_SUBDEV_IR_PULSE_MAX_WIDTH_NS 0x7fffffff
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#define V4L2_SUBDEV_IR_PULSE_LEVEL_MASK 0x80000000
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#define V4L2_SUBDEV_IR_PULSE_RX_SEQ_END 0xffffffff
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struct v4l2_subdev_ir_parameters {
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/* Either Rx or Tx */
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unsigned int bytes_per_data_element; /* of data in read or write call */
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enum v4l2_subdev_ir_mode mode;
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bool enable;
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bool interrupt_enable;
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bool shutdown; /* true: set hardware to low/no power, false: normal */
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bool modulation; /* true: uses carrier, false: baseband */
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u32 max_pulse_width; /* ns, valid only for baseband signal */
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unsigned int carrier_freq; /* Hz, valid only for modulated signal*/
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unsigned int duty_cycle; /* percent, valid only for modulated signal*/
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bool invert; /* logically invert sense of mark/space */
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/* Rx only */
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u32 noise_filter_min_width; /* ns, min time of a valid pulse */
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unsigned int carrier_range_lower; /* Hz, valid only for modulated sig */
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unsigned int carrier_range_upper; /* Hz, valid only for modulated sig */
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u32 resolution; /* ns */
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};
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struct v4l2_subdev_ir_ops {
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/* Common to receiver and transmitter */
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int (*interrupt_service_routine)(struct v4l2_subdev *sd,
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u32 status, bool *handled);
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/* Receiver */
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int (*rx_read)(struct v4l2_subdev *sd, u8 *buf, size_t count,
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ssize_t *num);
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int (*rx_g_parameters)(struct v4l2_subdev *sd,
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struct v4l2_subdev_ir_parameters *params);
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int (*rx_s_parameters)(struct v4l2_subdev *sd,
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struct v4l2_subdev_ir_parameters *params);
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/* Transmitter */
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int (*tx_write)(struct v4l2_subdev *sd, u8 *buf, size_t count,
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ssize_t *num);
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int (*tx_g_parameters)(struct v4l2_subdev *sd,
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struct v4l2_subdev_ir_parameters *params);
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int (*tx_s_parameters)(struct v4l2_subdev *sd,
|
|
struct v4l2_subdev_ir_parameters *params);
|
|
};
|
|
|
|
struct v4l2_subdev_ops {
|
|
const struct v4l2_subdev_core_ops *core;
|
|
const struct v4l2_subdev_tuner_ops *tuner;
|
|
const struct v4l2_subdev_audio_ops *audio;
|
|
const struct v4l2_subdev_video_ops *video;
|
|
const struct v4l2_subdev_ir_ops *ir;
|
|
const struct v4l2_subdev_sensor_ops *sensor;
|
|
};
|
|
|
|
#define V4L2_SUBDEV_NAME_SIZE 32
|
|
|
|
/* Set this flag if this subdev is a i2c device. */
|
|
#define V4L2_SUBDEV_FL_IS_I2C (1U << 0)
|
|
|
|
/* Each instance of a subdev driver should create this struct, either
|
|
stand-alone or embedded in a larger struct.
|
|
*/
|
|
struct v4l2_subdev {
|
|
struct list_head list;
|
|
struct module *owner;
|
|
u32 flags;
|
|
struct v4l2_device *v4l2_dev;
|
|
const struct v4l2_subdev_ops *ops;
|
|
/* name must be unique */
|
|
char name[V4L2_SUBDEV_NAME_SIZE];
|
|
/* can be used to group similar subdevs, value is driver-specific */
|
|
u32 grp_id;
|
|
/* pointer to private data */
|
|
void *priv;
|
|
};
|
|
|
|
static inline void v4l2_set_subdevdata(struct v4l2_subdev *sd, void *p)
|
|
{
|
|
sd->priv = p;
|
|
}
|
|
|
|
static inline void *v4l2_get_subdevdata(const struct v4l2_subdev *sd)
|
|
{
|
|
return sd->priv;
|
|
}
|
|
|
|
static inline void v4l2_subdev_init(struct v4l2_subdev *sd,
|
|
const struct v4l2_subdev_ops *ops)
|
|
{
|
|
INIT_LIST_HEAD(&sd->list);
|
|
/* ops->core MUST be set */
|
|
BUG_ON(!ops || !ops->core);
|
|
sd->ops = ops;
|
|
sd->v4l2_dev = NULL;
|
|
sd->flags = 0;
|
|
sd->name[0] = '\0';
|
|
sd->grp_id = 0;
|
|
sd->priv = NULL;
|
|
}
|
|
|
|
/* Call an ops of a v4l2_subdev, doing the right checks against
|
|
NULL pointers.
|
|
|
|
Example: err = v4l2_subdev_call(sd, core, g_chip_ident, &chip);
|
|
*/
|
|
#define v4l2_subdev_call(sd, o, f, args...) \
|
|
(!(sd) ? -ENODEV : (((sd)->ops->o && (sd)->ops->o->f) ? \
|
|
(sd)->ops->o->f((sd) , ##args) : -ENOIOCTLCMD))
|
|
|
|
/* Send a notification to v4l2_device. */
|
|
#define v4l2_subdev_notify(sd, notification, arg) \
|
|
((!(sd) || !(sd)->v4l2_dev || !(sd)->v4l2_dev->notify) ? -ENODEV : \
|
|
(sd)->v4l2_dev->notify((sd), (notification), (arg)))
|
|
|
|
#endif
|