| /* |
| V4L2 sub-device support header. |
| |
| Copyright (C) 2008 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 |
| */ |
| |
| #ifndef _V4L2_SUBDEV_H |
| #define _V4L2_SUBDEV_H |
| |
| #include <media/v4l2-common.h> |
| |
| struct v4l2_device; |
| struct v4l2_subdev; |
| struct tuner_setup; |
| |
| /* decode_vbi_line */ |
| struct v4l2_decode_vbi_line { |
| u32 is_second_field; /* Set to 0 for the first (odd) field, |
| set to 1 for the second (even) field. */ |
| u8 *p; /* Pointer to the sliced VBI data from the decoder. |
| On exit points to the start of the payload. */ |
| u32 line; /* Line number of the sliced VBI data (1-23) */ |
| u32 type; /* VBI service type (V4L2_SLICED_*). 0 if no service found */ |
| }; |
| |
| /* Sub-devices are devices that are connected somehow to the main bridge |
| device. These devices are usually audio/video muxers/encoders/decoders or |
| sensors and webcam controllers. |
| |
| Usually these devices are controlled through an i2c bus, but other busses |
| may also be used. |
| |
| The v4l2_subdev struct provides a way of accessing these devices in a |
| generic manner. Most operations that these sub-devices support fall in |
| a few categories: core ops, audio ops, video ops and tuner ops. |
| |
| More categories can be added if needed, although this should remain a |
| limited set (no more than approx. 8 categories). |
| |
| Each category has its own set of ops that subdev drivers can implement. |
| |
| A subdev driver can leave the pointer to the category ops NULL if |
| it does not implement them (e.g. an audio subdev will generally not |
| implement the video category ops). The exception is the core category: |
| this must always be present. |
| |
| These ops are all used internally so it is no problem to change, remove |
| or add ops or move ops from one to another category. Currently these |
| ops are based on the original ioctls, but since ops are not limited to |
| one argument there is room for improvement here once all i2c subdev |
| drivers are converted to use these ops. |
| */ |
| |
| /* Core ops: it is highly recommended to implement at least these ops: |
| |
| g_chip_ident |
| log_status |
| g_register |
| s_register |
| |
| This provides basic debugging support. |
| |
| The ioctl ops is meant for generic ioctl-like commands. Depending on |
| the use-case it might be better to use subdev-specific ops (currently |
| not yet implemented) since ops provide proper type-checking. |
| */ |
| |
| /* s_config: if set, then it is always called by the v4l2_i2c_new_subdev* |
| functions after the v4l2_subdev was registered. It is used to pass |
| platform data to the subdev which can be used during initialization. |
| |
| init: initialize the sensor registors to some sort of reasonable default |
| values. Do not use for new drivers and should be removed in existing |
| drivers. |
| |
| load_fw: load firmware. |
| |
| reset: generic reset command. The argument selects which subsystems to |
| reset. Passing 0 will always reset the whole chip. Do not use for new |
| drivers without discussing this first on the linux-media mailinglist. |
| There should be no reason normally to reset a device. |
| |
| s_gpio: set GPIO pins. Very simple right now, might need to be extended with |
| a direction argument if needed. |
| */ |
| struct v4l2_subdev_core_ops { |
| int (*g_chip_ident)(struct v4l2_subdev *sd, struct v4l2_dbg_chip_ident *chip); |
| int (*log_status)(struct v4l2_subdev *sd); |
| int (*s_config)(struct v4l2_subdev *sd, int irq, void *platform_data); |
| int (*init)(struct v4l2_subdev *sd, u32 val); |
| int (*load_fw)(struct v4l2_subdev *sd); |
| int (*reset)(struct v4l2_subdev *sd, u32 val); |
| int (*s_gpio)(struct v4l2_subdev *sd, u32 val); |
| int (*queryctrl)(struct v4l2_subdev *sd, struct v4l2_queryctrl *qc); |
| int (*g_ctrl)(struct v4l2_subdev *sd, struct v4l2_control *ctrl); |
| int (*s_ctrl)(struct v4l2_subdev *sd, struct v4l2_control *ctrl); |
| int (*g_ext_ctrls)(struct v4l2_subdev *sd, struct v4l2_ext_controls *ctrls); |
| int (*s_ext_ctrls)(struct v4l2_subdev *sd, struct v4l2_ext_controls *ctrls); |
| int (*try_ext_ctrls)(struct v4l2_subdev *sd, struct v4l2_ext_controls *ctrls); |
| int (*querymenu)(struct v4l2_subdev *sd, struct v4l2_querymenu *qm); |
| int (*s_std)(struct v4l2_subdev *sd, v4l2_std_id norm); |
| long (*ioctl)(struct v4l2_subdev *sd, unsigned int cmd, void *arg); |
| #ifdef CONFIG_VIDEO_ADV_DEBUG |
| int (*g_register)(struct v4l2_subdev *sd, struct v4l2_dbg_register *reg); |
| int (*s_register)(struct v4l2_subdev *sd, struct v4l2_dbg_register *reg); |
| #endif |
| }; |
| |
| /* s_mode: switch the tuner to a specific tuner mode. Replacement of s_radio. |
| |
| s_radio: v4l device was opened in Radio mode, to be replaced by s_mode. |
| |
| s_type_addr: sets tuner type and its I2C addr. |
| |
| s_config: sets tda9887 specific stuff, like port1, port2 and qss |
| |
| s_standby: puts tuner on powersaving state, disabling it, except for i2c. |
| */ |
| struct v4l2_subdev_tuner_ops { |
| int (*s_mode)(struct v4l2_subdev *sd, enum v4l2_tuner_type); |
| int (*s_radio)(struct v4l2_subdev *sd); |
| int (*s_frequency)(struct v4l2_subdev *sd, struct v4l2_frequency *freq); |
| int (*g_frequency)(struct v4l2_subdev *sd, struct v4l2_frequency *freq); |
| int (*g_tuner)(struct v4l2_subdev *sd, struct v4l2_tuner *vt); |
| int (*s_tuner)(struct v4l2_subdev *sd, struct v4l2_tuner *vt); |
| int (*s_type_addr)(struct v4l2_subdev *sd, struct tuner_setup *type); |
| int (*s_config)(struct v4l2_subdev *sd, const struct v4l2_priv_tun_config *config); |
| int (*s_standby)(struct v4l2_subdev *sd); |
| }; |
| |
| /* s_clock_freq: set the frequency (in Hz) of the audio clock output. |
| Used to slave an audio processor to the video decoder, ensuring that |
| audio and video remain synchronized. Usual values for the frequency |
| are 48000, 44100 or 32000 Hz. If the frequency is not supported, then |
| -EINVAL is returned. |
| |
| s_i2s_clock_freq: sets I2S speed in bps. This is used to provide a standard |
| way to select I2S clock used by driving digital audio streams at some |
| board designs. Usual values for the frequency are 1024000 and 2048000. |
| If the frequency is not supported, then -EINVAL is returned. |
| |
| s_routing: used to define the input and/or output pins of an audio chip, |
| and any additional configuration data. |
| Never attempt to use user-level input IDs (e.g. Composite, S-Video, |
| Tuner) at this level. An i2c device shouldn't know about whether an |
| input pin is connected to a Composite connector, become on another |
| board or platform it might be connected to something else entirely. |
| The calling driver is responsible for mapping a user-level input to |
| the right pins on the i2c device. |
| */ |
| struct v4l2_subdev_audio_ops { |
| int (*s_clock_freq)(struct v4l2_subdev *sd, u32 freq); |
| int (*s_i2s_clock_freq)(struct v4l2_subdev *sd, u32 freq); |
| int (*s_routing)(struct v4l2_subdev *sd, u32 input, u32 output, u32 config); |
| }; |
| |
| /* |
| decode_vbi_line: video decoders that support sliced VBI need to implement |
| this ioctl. Field p of the v4l2_sliced_vbi_line struct is set to the |
| start of the VBI data that was generated by the decoder. The driver |
| then parses the sliced VBI data and sets the other fields in the |
| struct accordingly. The pointer p is updated to point to the start of |
| the payload which can be copied verbatim into the data field of the |
| v4l2_sliced_vbi_data struct. If no valid VBI data was found, then the |
| type field is set to 0 on return. |
| |
| s_vbi_data: used to generate VBI signals on a video signal. |
| v4l2_sliced_vbi_data is filled with the data packets that should be |
| output. Note that if you set the line field to 0, then that VBI signal |
| is disabled. If no valid VBI data was found, then the type field is |
| set to 0 on return. |
| |
| g_vbi_data: used to obtain the sliced VBI packet from a readback register. |
| Not all video decoders support this. If no data is available because |
| the readback register contains invalid or erroneous data -EIO is |
| returned. Note that you must fill in the 'id' member and the 'field' |
| member (to determine whether CC data from the first or second field |
| should be obtained). |
| |
| s_std_output: set v4l2_std_id for video OUTPUT devices. This is ignored by |
| video input devices. |
| |
| s_crystal_freq: sets the frequency of the crystal used to generate the |
| clocks in Hz. An extra flags field allows device specific configuration |
| regarding clock frequency dividers, etc. If not used, then set flags |
| to 0. If the frequency is not supported, then -EINVAL is returned. |
| |
| g_input_status: get input status. Same as the status field in the v4l2_input |
| struct. |
| |
| s_routing: see s_routing in audio_ops, except this version is for video |
| devices. |
| */ |
| struct v4l2_subdev_video_ops { |
| int (*s_routing)(struct v4l2_subdev *sd, u32 input, u32 output, u32 config); |
| int (*s_crystal_freq)(struct v4l2_subdev *sd, u32 freq, u32 flags); |
| int (*decode_vbi_line)(struct v4l2_subdev *sd, struct v4l2_decode_vbi_line *vbi_line); |
| int (*s_vbi_data)(struct v4l2_subdev *sd, const struct v4l2_sliced_vbi_data *vbi_data); |
| int (*g_vbi_data)(struct v4l2_subdev *sd, struct v4l2_sliced_vbi_data *vbi_data); |
| int (*g_sliced_vbi_cap)(struct v4l2_subdev *sd, struct v4l2_sliced_vbi_cap *cap); |
| int (*s_std_output)(struct v4l2_subdev *sd, v4l2_std_id std); |
| int (*querystd)(struct v4l2_subdev *sd, v4l2_std_id *std); |
| int (*g_input_status)(struct v4l2_subdev *sd, u32 *status); |
| int (*s_stream)(struct v4l2_subdev *sd, int enable); |
| int (*enum_fmt)(struct v4l2_subdev *sd, struct v4l2_fmtdesc *fmtdesc); |
| int (*g_fmt)(struct v4l2_subdev *sd, struct v4l2_format *fmt); |
| int (*try_fmt)(struct v4l2_subdev *sd, struct v4l2_format *fmt); |
| int (*s_fmt)(struct v4l2_subdev *sd, struct v4l2_format *fmt); |
| int (*g_parm)(struct v4l2_subdev *sd, struct v4l2_streamparm *param); |
| int (*s_parm)(struct v4l2_subdev *sd, struct v4l2_streamparm *param); |
| int (*enum_framesizes)(struct v4l2_subdev *sd, struct v4l2_frmsizeenum *fsize); |
| int (*enum_frameintervals)(struct v4l2_subdev *sd, struct v4l2_frmivalenum *fival); |
| }; |
| |
| 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; |
| }; |
| |
| #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) && (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 |