Hans Verkuil | 2a1fcdf | 2008-11-29 21:36:58 -0300 | [diff] [blame] | 1 | /* |
| 2 | V4L2 sub-device support header. |
| 3 | |
| 4 | Copyright (C) 2008 Hans Verkuil <hverkuil@xs4all.nl> |
| 5 | |
| 6 | This program is free software; you can redistribute it and/or modify |
| 7 | it under the terms of the GNU General Public License as published by |
| 8 | the Free Software Foundation; either version 2 of the License, or |
| 9 | (at your option) any later version. |
| 10 | |
| 11 | This program is distributed in the hope that it will be useful, |
| 12 | but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 13 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| 14 | GNU General Public License for more details. |
| 15 | |
| 16 | You should have received a copy of the GNU General Public License |
| 17 | along with this program; if not, write to the Free Software |
| 18 | Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA |
| 19 | */ |
| 20 | |
| 21 | #ifndef _V4L2_SUBDEV_H |
| 22 | #define _V4L2_SUBDEV_H |
| 23 | |
| 24 | #include <media/v4l2-common.h> |
| 25 | |
| 26 | struct v4l2_device; |
| 27 | struct v4l2_subdev; |
| 28 | struct tuner_setup; |
| 29 | |
Hans Verkuil | 78a3b4d | 2009-04-01 03:41:09 -0300 | [diff] [blame] | 30 | /* decode_vbi_line */ |
| 31 | struct v4l2_decode_vbi_line { |
| 32 | u32 is_second_field; /* Set to 0 for the first (odd) field, |
| 33 | set to 1 for the second (even) field. */ |
| 34 | u8 *p; /* Pointer to the sliced VBI data from the decoder. |
| 35 | On exit points to the start of the payload. */ |
| 36 | u32 line; /* Line number of the sliced VBI data (1-23) */ |
| 37 | u32 type; /* VBI service type (V4L2_SLICED_*). 0 if no service found */ |
| 38 | }; |
| 39 | |
Hans Verkuil | 2a1fcdf | 2008-11-29 21:36:58 -0300 | [diff] [blame] | 40 | /* Sub-devices are devices that are connected somehow to the main bridge |
| 41 | device. These devices are usually audio/video muxers/encoders/decoders or |
| 42 | sensors and webcam controllers. |
| 43 | |
| 44 | Usually these devices are controlled through an i2c bus, but other busses |
| 45 | may also be used. |
| 46 | |
| 47 | The v4l2_subdev struct provides a way of accessing these devices in a |
| 48 | generic manner. Most operations that these sub-devices support fall in |
| 49 | a few categories: core ops, audio ops, video ops and tuner ops. |
| 50 | |
| 51 | More categories can be added if needed, although this should remain a |
| 52 | limited set (no more than approx. 8 categories). |
| 53 | |
| 54 | Each category has its own set of ops that subdev drivers can implement. |
| 55 | |
| 56 | A subdev driver can leave the pointer to the category ops NULL if |
| 57 | it does not implement them (e.g. an audio subdev will generally not |
| 58 | implement the video category ops). The exception is the core category: |
| 59 | this must always be present. |
| 60 | |
| 61 | These ops are all used internally so it is no problem to change, remove |
| 62 | or add ops or move ops from one to another category. Currently these |
| 63 | ops are based on the original ioctls, but since ops are not limited to |
| 64 | one argument there is room for improvement here once all i2c subdev |
| 65 | drivers are converted to use these ops. |
| 66 | */ |
| 67 | |
| 68 | /* Core ops: it is highly recommended to implement at least these ops: |
| 69 | |
| 70 | g_chip_ident |
| 71 | log_status |
| 72 | g_register |
| 73 | s_register |
| 74 | |
| 75 | This provides basic debugging support. |
| 76 | |
| 77 | The ioctl ops is meant for generic ioctl-like commands. Depending on |
| 78 | the use-case it might be better to use subdev-specific ops (currently |
| 79 | not yet implemented) since ops provide proper type-checking. |
| 80 | */ |
Hans Verkuil | 78a3b4d | 2009-04-01 03:41:09 -0300 | [diff] [blame] | 81 | |
Hans Verkuil | f0222c7 | 2009-06-09 17:12:33 -0300 | [diff] [blame] | 82 | /* s_config: if set, then it is always called by the v4l2_i2c_new_subdev* |
| 83 | functions after the v4l2_subdev was registered. It is used to pass |
| 84 | platform data to the subdev which can be used during initialization. |
| 85 | |
| 86 | init: initialize the sensor registors to some sort of reasonable default |
Hans Verkuil | 78a3b4d | 2009-04-01 03:41:09 -0300 | [diff] [blame] | 87 | values. Do not use for new drivers and should be removed in existing |
| 88 | drivers. |
| 89 | |
Hans Verkuil | cc26b07 | 2009-03-29 19:20:26 -0300 | [diff] [blame] | 90 | load_fw: load firmware. |
| 91 | |
| 92 | reset: generic reset command. The argument selects which subsystems to |
Hans Verkuil | 78a3b4d | 2009-04-01 03:41:09 -0300 | [diff] [blame] | 93 | reset. Passing 0 will always reset the whole chip. Do not use for new |
| 94 | drivers without discussing this first on the linux-media mailinglist. |
| 95 | There should be no reason normally to reset a device. |
| 96 | |
| 97 | s_gpio: set GPIO pins. Very simple right now, might need to be extended with |
| 98 | a direction argument if needed. |
Hans Verkuil | 78a3b4d | 2009-04-01 03:41:09 -0300 | [diff] [blame] | 99 | */ |
Hans Verkuil | 2a1fcdf | 2008-11-29 21:36:58 -0300 | [diff] [blame] | 100 | struct v4l2_subdev_core_ops { |
Hans Verkuil | aecde8b5 | 2008-12-30 07:14:19 -0300 | [diff] [blame] | 101 | int (*g_chip_ident)(struct v4l2_subdev *sd, struct v4l2_dbg_chip_ident *chip); |
Hans Verkuil | 2a1fcdf | 2008-11-29 21:36:58 -0300 | [diff] [blame] | 102 | int (*log_status)(struct v4l2_subdev *sd); |
Hans Verkuil | f0222c7 | 2009-06-09 17:12:33 -0300 | [diff] [blame] | 103 | int (*s_config)(struct v4l2_subdev *sd, int irq, void *platform_data); |
Hans Verkuil | 2a1fcdf | 2008-11-29 21:36:58 -0300 | [diff] [blame] | 104 | int (*init)(struct v4l2_subdev *sd, u32 val); |
Hans Verkuil | cc26b07 | 2009-03-29 19:20:26 -0300 | [diff] [blame] | 105 | int (*load_fw)(struct v4l2_subdev *sd); |
Hans Verkuil | 2a1fcdf | 2008-11-29 21:36:58 -0300 | [diff] [blame] | 106 | int (*reset)(struct v4l2_subdev *sd, u32 val); |
| 107 | int (*s_gpio)(struct v4l2_subdev *sd, u32 val); |
| 108 | int (*queryctrl)(struct v4l2_subdev *sd, struct v4l2_queryctrl *qc); |
| 109 | int (*g_ctrl)(struct v4l2_subdev *sd, struct v4l2_control *ctrl); |
| 110 | int (*s_ctrl)(struct v4l2_subdev *sd, struct v4l2_control *ctrl); |
Hans Verkuil | 952617f | 2009-01-12 18:17:14 -0300 | [diff] [blame] | 111 | int (*g_ext_ctrls)(struct v4l2_subdev *sd, struct v4l2_ext_controls *ctrls); |
| 112 | int (*s_ext_ctrls)(struct v4l2_subdev *sd, struct v4l2_ext_controls *ctrls); |
| 113 | int (*try_ext_ctrls)(struct v4l2_subdev *sd, struct v4l2_ext_controls *ctrls); |
Hans Verkuil | 2a1fcdf | 2008-11-29 21:36:58 -0300 | [diff] [blame] | 114 | int (*querymenu)(struct v4l2_subdev *sd, struct v4l2_querymenu *qm); |
Hans Verkuil | f41737e | 2009-04-01 03:52:39 -0300 | [diff] [blame] | 115 | int (*s_std)(struct v4l2_subdev *sd, v4l2_std_id norm); |
Hans Verkuil | 069b747 | 2008-12-30 07:04:34 -0300 | [diff] [blame] | 116 | long (*ioctl)(struct v4l2_subdev *sd, unsigned int cmd, void *arg); |
Hans Verkuil | 2a1fcdf | 2008-11-29 21:36:58 -0300 | [diff] [blame] | 117 | #ifdef CONFIG_VIDEO_ADV_DEBUG |
Hans Verkuil | aecde8b5 | 2008-12-30 07:14:19 -0300 | [diff] [blame] | 118 | int (*g_register)(struct v4l2_subdev *sd, struct v4l2_dbg_register *reg); |
| 119 | int (*s_register)(struct v4l2_subdev *sd, struct v4l2_dbg_register *reg); |
Hans Verkuil | 2a1fcdf | 2008-11-29 21:36:58 -0300 | [diff] [blame] | 120 | #endif |
| 121 | }; |
| 122 | |
Hans Verkuil | 78a3b4d | 2009-04-01 03:41:09 -0300 | [diff] [blame] | 123 | /* s_mode: switch the tuner to a specific tuner mode. Replacement of s_radio. |
| 124 | |
| 125 | s_radio: v4l device was opened in Radio mode, to be replaced by s_mode. |
| 126 | |
| 127 | s_type_addr: sets tuner type and its I2C addr. |
| 128 | |
| 129 | s_config: sets tda9887 specific stuff, like port1, port2 and qss |
Hans Verkuil | 7c9fc9d | 2009-04-01 03:49:59 -0300 | [diff] [blame] | 130 | |
| 131 | s_standby: puts tuner on powersaving state, disabling it, except for i2c. |
Hans Verkuil | 78a3b4d | 2009-04-01 03:41:09 -0300 | [diff] [blame] | 132 | */ |
Hans Verkuil | 2a1fcdf | 2008-11-29 21:36:58 -0300 | [diff] [blame] | 133 | struct v4l2_subdev_tuner_ops { |
| 134 | int (*s_mode)(struct v4l2_subdev *sd, enum v4l2_tuner_type); |
| 135 | int (*s_radio)(struct v4l2_subdev *sd); |
| 136 | int (*s_frequency)(struct v4l2_subdev *sd, struct v4l2_frequency *freq); |
| 137 | int (*g_frequency)(struct v4l2_subdev *sd, struct v4l2_frequency *freq); |
| 138 | int (*g_tuner)(struct v4l2_subdev *sd, struct v4l2_tuner *vt); |
| 139 | int (*s_tuner)(struct v4l2_subdev *sd, struct v4l2_tuner *vt); |
Eduardo Valentin | d6bacea | 2009-08-08 08:34:18 -0300 | [diff] [blame] | 140 | int (*g_modulator)(struct v4l2_subdev *sd, struct v4l2_modulator *vm); |
| 141 | int (*s_modulator)(struct v4l2_subdev *sd, struct v4l2_modulator *vm); |
Hans Verkuil | 2a1fcdf | 2008-11-29 21:36:58 -0300 | [diff] [blame] | 142 | int (*s_type_addr)(struct v4l2_subdev *sd, struct tuner_setup *type); |
| 143 | int (*s_config)(struct v4l2_subdev *sd, const struct v4l2_priv_tun_config *config); |
Hans Verkuil | 7c9fc9d | 2009-04-01 03:49:59 -0300 | [diff] [blame] | 144 | int (*s_standby)(struct v4l2_subdev *sd); |
Hans Verkuil | 2a1fcdf | 2008-11-29 21:36:58 -0300 | [diff] [blame] | 145 | }; |
| 146 | |
Hans Verkuil | 78a3b4d | 2009-04-01 03:41:09 -0300 | [diff] [blame] | 147 | /* s_clock_freq: set the frequency (in Hz) of the audio clock output. |
| 148 | Used to slave an audio processor to the video decoder, ensuring that |
| 149 | audio and video remain synchronized. Usual values for the frequency |
| 150 | are 48000, 44100 or 32000 Hz. If the frequency is not supported, then |
| 151 | -EINVAL is returned. |
| 152 | |
| 153 | s_i2s_clock_freq: sets I2S speed in bps. This is used to provide a standard |
| 154 | way to select I2S clock used by driving digital audio streams at some |
| 155 | board designs. Usual values for the frequency are 1024000 and 2048000. |
| 156 | If the frequency is not supported, then -EINVAL is returned. |
| 157 | |
Hans Verkuil | 5325b42 | 2009-04-02 11:26:22 -0300 | [diff] [blame] | 158 | s_routing: used to define the input and/or output pins of an audio chip, |
| 159 | and any additional configuration data. |
Hans Verkuil | 78a3b4d | 2009-04-01 03:41:09 -0300 | [diff] [blame] | 160 | Never attempt to use user-level input IDs (e.g. Composite, S-Video, |
| 161 | Tuner) at this level. An i2c device shouldn't know about whether an |
| 162 | input pin is connected to a Composite connector, become on another |
| 163 | board or platform it might be connected to something else entirely. |
| 164 | The calling driver is responsible for mapping a user-level input to |
| 165 | the right pins on the i2c device. |
| 166 | */ |
Hans Verkuil | 2a1fcdf | 2008-11-29 21:36:58 -0300 | [diff] [blame] | 167 | struct v4l2_subdev_audio_ops { |
| 168 | int (*s_clock_freq)(struct v4l2_subdev *sd, u32 freq); |
| 169 | int (*s_i2s_clock_freq)(struct v4l2_subdev *sd, u32 freq); |
Hans Verkuil | 5325b42 | 2009-04-02 11:26:22 -0300 | [diff] [blame] | 170 | int (*s_routing)(struct v4l2_subdev *sd, u32 input, u32 output, u32 config); |
Hans Verkuil | 2a1fcdf | 2008-11-29 21:36:58 -0300 | [diff] [blame] | 171 | }; |
| 172 | |
Hans Verkuil | 78a3b4d | 2009-04-01 03:41:09 -0300 | [diff] [blame] | 173 | /* |
| 174 | decode_vbi_line: video decoders that support sliced VBI need to implement |
| 175 | this ioctl. Field p of the v4l2_sliced_vbi_line struct is set to the |
| 176 | start of the VBI data that was generated by the decoder. The driver |
| 177 | then parses the sliced VBI data and sets the other fields in the |
| 178 | struct accordingly. The pointer p is updated to point to the start of |
| 179 | the payload which can be copied verbatim into the data field of the |
| 180 | v4l2_sliced_vbi_data struct. If no valid VBI data was found, then the |
| 181 | type field is set to 0 on return. |
| 182 | |
Hans Verkuil | cc26b07 | 2009-03-29 19:20:26 -0300 | [diff] [blame] | 183 | s_vbi_data: used to generate VBI signals on a video signal. |
Hans Verkuil | 78a3b4d | 2009-04-01 03:41:09 -0300 | [diff] [blame] | 184 | v4l2_sliced_vbi_data is filled with the data packets that should be |
| 185 | output. Note that if you set the line field to 0, then that VBI signal |
| 186 | is disabled. If no valid VBI data was found, then the type field is |
| 187 | set to 0 on return. |
| 188 | |
Hans Verkuil | cc26b07 | 2009-03-29 19:20:26 -0300 | [diff] [blame] | 189 | g_vbi_data: used to obtain the sliced VBI packet from a readback register. |
Hans Verkuil | 78a3b4d | 2009-04-01 03:41:09 -0300 | [diff] [blame] | 190 | Not all video decoders support this. If no data is available because |
| 191 | the readback register contains invalid or erroneous data -EIO is |
| 192 | returned. Note that you must fill in the 'id' member and the 'field' |
| 193 | member (to determine whether CC data from the first or second field |
| 194 | should be obtained). |
| 195 | |
Hans Verkuil | cc26b07 | 2009-03-29 19:20:26 -0300 | [diff] [blame] | 196 | s_std_output: set v4l2_std_id for video OUTPUT devices. This is ignored by |
Hans Verkuil | 78a3b4d | 2009-04-01 03:41:09 -0300 | [diff] [blame] | 197 | video input devices. |
| 198 | |
Hans Verkuil | 3ff4ad8 | 2009-04-01 03:15:52 -0300 | [diff] [blame] | 199 | s_crystal_freq: sets the frequency of the crystal used to generate the |
| 200 | clocks in Hz. An extra flags field allows device specific configuration |
Hans Verkuil | 78a3b4d | 2009-04-01 03:41:09 -0300 | [diff] [blame] | 201 | regarding clock frequency dividers, etc. If not used, then set flags |
| 202 | to 0. If the frequency is not supported, then -EINVAL is returned. |
| 203 | |
Hans Verkuil | cc26b07 | 2009-03-29 19:20:26 -0300 | [diff] [blame] | 204 | g_input_status: get input status. Same as the status field in the v4l2_input |
Hans Verkuil | 78a3b4d | 2009-04-01 03:41:09 -0300 | [diff] [blame] | 205 | struct. |
| 206 | |
Hans Verkuil | cc26b07 | 2009-03-29 19:20:26 -0300 | [diff] [blame] | 207 | s_routing: see s_routing in audio_ops, except this version is for video |
Hans Verkuil | 78a3b4d | 2009-04-01 03:41:09 -0300 | [diff] [blame] | 208 | devices. |
| 209 | */ |
Hans Verkuil | 2a1fcdf | 2008-11-29 21:36:58 -0300 | [diff] [blame] | 210 | struct v4l2_subdev_video_ops { |
Hans Verkuil | 5325b42 | 2009-04-02 11:26:22 -0300 | [diff] [blame] | 211 | int (*s_routing)(struct v4l2_subdev *sd, u32 input, u32 output, u32 config); |
Hans Verkuil | 3ff4ad8 | 2009-04-01 03:15:52 -0300 | [diff] [blame] | 212 | int (*s_crystal_freq)(struct v4l2_subdev *sd, u32 freq, u32 flags); |
Hans Verkuil | 2a1fcdf | 2008-11-29 21:36:58 -0300 | [diff] [blame] | 213 | int (*decode_vbi_line)(struct v4l2_subdev *sd, struct v4l2_decode_vbi_line *vbi_line); |
| 214 | int (*s_vbi_data)(struct v4l2_subdev *sd, const struct v4l2_sliced_vbi_data *vbi_data); |
| 215 | int (*g_vbi_data)(struct v4l2_subdev *sd, struct v4l2_sliced_vbi_data *vbi_data); |
Hans Verkuil | 1fe2740 | 2008-12-18 11:16:24 -0300 | [diff] [blame] | 216 | int (*g_sliced_vbi_cap)(struct v4l2_subdev *sd, struct v4l2_sliced_vbi_cap *cap); |
Hans Verkuil | 2a1fcdf | 2008-11-29 21:36:58 -0300 | [diff] [blame] | 217 | int (*s_std_output)(struct v4l2_subdev *sd, v4l2_std_id std); |
Hans Verkuil | 1b6f1d9 | 2009-02-13 07:48:21 -0300 | [diff] [blame] | 218 | int (*querystd)(struct v4l2_subdev *sd, v4l2_std_id *std); |
| 219 | int (*g_input_status)(struct v4l2_subdev *sd, u32 *status); |
Hans Verkuil | 2a1fcdf | 2008-11-29 21:36:58 -0300 | [diff] [blame] | 220 | int (*s_stream)(struct v4l2_subdev *sd, int enable); |
Hans Verkuil | 2da9479 | 2009-02-06 18:59:35 -0300 | [diff] [blame] | 221 | int (*enum_fmt)(struct v4l2_subdev *sd, struct v4l2_fmtdesc *fmtdesc); |
Hans Verkuil | 2a1fcdf | 2008-11-29 21:36:58 -0300 | [diff] [blame] | 222 | int (*g_fmt)(struct v4l2_subdev *sd, struct v4l2_format *fmt); |
Hans Verkuil | 2da9479 | 2009-02-06 18:59:35 -0300 | [diff] [blame] | 223 | int (*try_fmt)(struct v4l2_subdev *sd, struct v4l2_format *fmt); |
| 224 | int (*s_fmt)(struct v4l2_subdev *sd, struct v4l2_format *fmt); |
Guennadi Liakhovetski | b7f2cef | 2009-06-24 10:31:25 -0300 | [diff] [blame] | 225 | int (*cropcap)(struct v4l2_subdev *sd, struct v4l2_cropcap *cc); |
| 226 | int (*g_crop)(struct v4l2_subdev *sd, struct v4l2_crop *crop); |
| 227 | int (*s_crop)(struct v4l2_subdev *sd, struct v4l2_crop *crop); |
Hans Verkuil | 2da9479 | 2009-02-06 18:59:35 -0300 | [diff] [blame] | 228 | int (*g_parm)(struct v4l2_subdev *sd, struct v4l2_streamparm *param); |
| 229 | int (*s_parm)(struct v4l2_subdev *sd, struct v4l2_streamparm *param); |
Hans Verkuil | 4b2ce11 | 2009-03-29 19:23:16 -0300 | [diff] [blame] | 230 | int (*enum_framesizes)(struct v4l2_subdev *sd, struct v4l2_frmsizeenum *fsize); |
| 231 | int (*enum_frameintervals)(struct v4l2_subdev *sd, struct v4l2_frmivalenum *fival); |
Hans Verkuil | 2a1fcdf | 2008-11-29 21:36:58 -0300 | [diff] [blame] | 232 | }; |
| 233 | |
| 234 | struct v4l2_subdev_ops { |
| 235 | const struct v4l2_subdev_core_ops *core; |
| 236 | const struct v4l2_subdev_tuner_ops *tuner; |
| 237 | const struct v4l2_subdev_audio_ops *audio; |
| 238 | const struct v4l2_subdev_video_ops *video; |
| 239 | }; |
| 240 | |
| 241 | #define V4L2_SUBDEV_NAME_SIZE 32 |
| 242 | |
Hans Verkuil | b5b2b7e | 2009-05-02 10:58:51 -0300 | [diff] [blame] | 243 | /* Set this flag if this subdev is a i2c device. */ |
| 244 | #define V4L2_SUBDEV_FL_IS_I2C (1U << 0) |
| 245 | |
Hans Verkuil | 2a1fcdf | 2008-11-29 21:36:58 -0300 | [diff] [blame] | 246 | /* Each instance of a subdev driver should create this struct, either |
| 247 | stand-alone or embedded in a larger struct. |
| 248 | */ |
| 249 | struct v4l2_subdev { |
| 250 | struct list_head list; |
| 251 | struct module *owner; |
Hans Verkuil | b5b2b7e | 2009-05-02 10:58:51 -0300 | [diff] [blame] | 252 | u32 flags; |
Hans Verkuil | b016760 | 2009-02-14 12:00:53 -0300 | [diff] [blame] | 253 | struct v4l2_device *v4l2_dev; |
Hans Verkuil | 2a1fcdf | 2008-11-29 21:36:58 -0300 | [diff] [blame] | 254 | const struct v4l2_subdev_ops *ops; |
| 255 | /* name must be unique */ |
| 256 | char name[V4L2_SUBDEV_NAME_SIZE]; |
| 257 | /* can be used to group similar subdevs, value is driver-specific */ |
| 258 | u32 grp_id; |
| 259 | /* pointer to private data */ |
| 260 | void *priv; |
| 261 | }; |
| 262 | |
| 263 | static inline void v4l2_set_subdevdata(struct v4l2_subdev *sd, void *p) |
| 264 | { |
| 265 | sd->priv = p; |
| 266 | } |
| 267 | |
| 268 | static inline void *v4l2_get_subdevdata(const struct v4l2_subdev *sd) |
| 269 | { |
| 270 | return sd->priv; |
| 271 | } |
| 272 | |
Hans Verkuil | 2a1fcdf | 2008-11-29 21:36:58 -0300 | [diff] [blame] | 273 | static inline void v4l2_subdev_init(struct v4l2_subdev *sd, |
| 274 | const struct v4l2_subdev_ops *ops) |
| 275 | { |
| 276 | INIT_LIST_HEAD(&sd->list); |
| 277 | /* ops->core MUST be set */ |
| 278 | BUG_ON(!ops || !ops->core); |
| 279 | sd->ops = ops; |
Hans Verkuil | b016760 | 2009-02-14 12:00:53 -0300 | [diff] [blame] | 280 | sd->v4l2_dev = NULL; |
Hans Verkuil | b5b2b7e | 2009-05-02 10:58:51 -0300 | [diff] [blame] | 281 | sd->flags = 0; |
Hans Verkuil | 2a1fcdf | 2008-11-29 21:36:58 -0300 | [diff] [blame] | 282 | sd->name[0] = '\0'; |
| 283 | sd->grp_id = 0; |
| 284 | sd->priv = NULL; |
| 285 | } |
| 286 | |
| 287 | /* Call an ops of a v4l2_subdev, doing the right checks against |
| 288 | NULL pointers. |
| 289 | |
| 290 | Example: err = v4l2_subdev_call(sd, core, g_chip_ident, &chip); |
| 291 | */ |
| 292 | #define v4l2_subdev_call(sd, o, f, args...) \ |
| 293 | (!(sd) ? -ENODEV : (((sd) && (sd)->ops->o && (sd)->ops->o->f) ? \ |
| 294 | (sd)->ops->o->f((sd) , ##args) : -ENOIOCTLCMD)) |
| 295 | |
Hans Verkuil | 98ec633 | 2009-03-08 17:02:10 -0300 | [diff] [blame] | 296 | /* Send a notification to v4l2_device. */ |
| 297 | #define v4l2_subdev_notify(sd, notification, arg) \ |
| 298 | ((!(sd) || !(sd)->v4l2_dev || !(sd)->v4l2_dev->notify) ? -ENODEV : \ |
| 299 | (sd)->v4l2_dev->notify((sd), (notification), (arg))) |
| 300 | |
Hans Verkuil | 2a1fcdf | 2008-11-29 21:36:58 -0300 | [diff] [blame] | 301 | #endif |