]>
Commit | Line | Data |
---|---|---|
2a1fcdf0 HV |
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 | ||
78a3b4db HV |
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 | ||
40 | /* s_crystal_freq */ | |
41 | struct v4l2_crystal_freq { | |
42 | u32 freq; /* frequency in Hz of the crystal */ | |
43 | u32 flags; /* device specific flags */ | |
44 | }; | |
45 | ||
2a1fcdf0 HV |
46 | /* Sub-devices are devices that are connected somehow to the main bridge |
47 | device. These devices are usually audio/video muxers/encoders/decoders or | |
48 | sensors and webcam controllers. | |
49 | ||
50 | Usually these devices are controlled through an i2c bus, but other busses | |
51 | may also be used. | |
52 | ||
53 | The v4l2_subdev struct provides a way of accessing these devices in a | |
54 | generic manner. Most operations that these sub-devices support fall in | |
55 | a few categories: core ops, audio ops, video ops and tuner ops. | |
56 | ||
57 | More categories can be added if needed, although this should remain a | |
58 | limited set (no more than approx. 8 categories). | |
59 | ||
60 | Each category has its own set of ops that subdev drivers can implement. | |
61 | ||
62 | A subdev driver can leave the pointer to the category ops NULL if | |
63 | it does not implement them (e.g. an audio subdev will generally not | |
64 | implement the video category ops). The exception is the core category: | |
65 | this must always be present. | |
66 | ||
67 | These ops are all used internally so it is no problem to change, remove | |
68 | or add ops or move ops from one to another category. Currently these | |
69 | ops are based on the original ioctls, but since ops are not limited to | |
70 | one argument there is room for improvement here once all i2c subdev | |
71 | drivers are converted to use these ops. | |
72 | */ | |
73 | ||
74 | /* Core ops: it is highly recommended to implement at least these ops: | |
75 | ||
76 | g_chip_ident | |
77 | log_status | |
78 | g_register | |
79 | s_register | |
80 | ||
81 | This provides basic debugging support. | |
82 | ||
83 | The ioctl ops is meant for generic ioctl-like commands. Depending on | |
84 | the use-case it might be better to use subdev-specific ops (currently | |
85 | not yet implemented) since ops provide proper type-checking. | |
86 | */ | |
78a3b4db HV |
87 | |
88 | /* init: initialize the sensor registors to some sort of reasonable default | |
89 | values. Do not use for new drivers and should be removed in existing | |
90 | drivers. | |
91 | ||
92 | reset: generic reset command. The argument selects which subsystems to | |
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. | |
78a3b4db | 99 | */ |
2a1fcdf0 | 100 | struct v4l2_subdev_core_ops { |
aecde8b5 | 101 | int (*g_chip_ident)(struct v4l2_subdev *sd, struct v4l2_dbg_chip_ident *chip); |
2a1fcdf0 HV |
102 | int (*log_status)(struct v4l2_subdev *sd); |
103 | int (*init)(struct v4l2_subdev *sd, u32 val); | |
2a1fcdf0 HV |
104 | int (*reset)(struct v4l2_subdev *sd, u32 val); |
105 | int (*s_gpio)(struct v4l2_subdev *sd, u32 val); | |
106 | int (*queryctrl)(struct v4l2_subdev *sd, struct v4l2_queryctrl *qc); | |
107 | int (*g_ctrl)(struct v4l2_subdev *sd, struct v4l2_control *ctrl); | |
108 | int (*s_ctrl)(struct v4l2_subdev *sd, struct v4l2_control *ctrl); | |
952617f2 HV |
109 | int (*g_ext_ctrls)(struct v4l2_subdev *sd, struct v4l2_ext_controls *ctrls); |
110 | int (*s_ext_ctrls)(struct v4l2_subdev *sd, struct v4l2_ext_controls *ctrls); | |
111 | int (*try_ext_ctrls)(struct v4l2_subdev *sd, struct v4l2_ext_controls *ctrls); | |
2a1fcdf0 | 112 | int (*querymenu)(struct v4l2_subdev *sd, struct v4l2_querymenu *qm); |
069b7479 | 113 | long (*ioctl)(struct v4l2_subdev *sd, unsigned int cmd, void *arg); |
2a1fcdf0 | 114 | #ifdef CONFIG_VIDEO_ADV_DEBUG |
aecde8b5 HV |
115 | int (*g_register)(struct v4l2_subdev *sd, struct v4l2_dbg_register *reg); |
116 | int (*s_register)(struct v4l2_subdev *sd, struct v4l2_dbg_register *reg); | |
2a1fcdf0 HV |
117 | #endif |
118 | }; | |
119 | ||
78a3b4db HV |
120 | /* s_mode: switch the tuner to a specific tuner mode. Replacement of s_radio. |
121 | ||
122 | s_radio: v4l device was opened in Radio mode, to be replaced by s_mode. | |
123 | ||
124 | s_type_addr: sets tuner type and its I2C addr. | |
125 | ||
126 | s_config: sets tda9887 specific stuff, like port1, port2 and qss | |
7c9fc9d5 HV |
127 | |
128 | s_standby: puts tuner on powersaving state, disabling it, except for i2c. | |
78a3b4db | 129 | */ |
2a1fcdf0 HV |
130 | struct v4l2_subdev_tuner_ops { |
131 | int (*s_mode)(struct v4l2_subdev *sd, enum v4l2_tuner_type); | |
132 | int (*s_radio)(struct v4l2_subdev *sd); | |
133 | int (*s_frequency)(struct v4l2_subdev *sd, struct v4l2_frequency *freq); | |
134 | int (*g_frequency)(struct v4l2_subdev *sd, struct v4l2_frequency *freq); | |
135 | int (*g_tuner)(struct v4l2_subdev *sd, struct v4l2_tuner *vt); | |
136 | int (*s_tuner)(struct v4l2_subdev *sd, struct v4l2_tuner *vt); | |
137 | int (*s_std)(struct v4l2_subdev *sd, v4l2_std_id norm); | |
138 | int (*s_type_addr)(struct v4l2_subdev *sd, struct tuner_setup *type); | |
139 | int (*s_config)(struct v4l2_subdev *sd, const struct v4l2_priv_tun_config *config); | |
7c9fc9d5 | 140 | int (*s_standby)(struct v4l2_subdev *sd); |
2a1fcdf0 HV |
141 | }; |
142 | ||
78a3b4db HV |
143 | /* s_clock_freq: set the frequency (in Hz) of the audio clock output. |
144 | Used to slave an audio processor to the video decoder, ensuring that | |
145 | audio and video remain synchronized. Usual values for the frequency | |
146 | are 48000, 44100 or 32000 Hz. If the frequency is not supported, then | |
147 | -EINVAL is returned. | |
148 | ||
149 | s_i2s_clock_freq: sets I2S speed in bps. This is used to provide a standard | |
150 | way to select I2S clock used by driving digital audio streams at some | |
151 | board designs. Usual values for the frequency are 1024000 and 2048000. | |
152 | If the frequency is not supported, then -EINVAL is returned. | |
153 | ||
154 | s_routing: used to define the input and/or output pins of an audio chip. | |
155 | Never attempt to use user-level input IDs (e.g. Composite, S-Video, | |
156 | Tuner) at this level. An i2c device shouldn't know about whether an | |
157 | input pin is connected to a Composite connector, become on another | |
158 | board or platform it might be connected to something else entirely. | |
159 | The calling driver is responsible for mapping a user-level input to | |
160 | the right pins on the i2c device. | |
161 | */ | |
2a1fcdf0 HV |
162 | struct v4l2_subdev_audio_ops { |
163 | int (*s_clock_freq)(struct v4l2_subdev *sd, u32 freq); | |
164 | int (*s_i2s_clock_freq)(struct v4l2_subdev *sd, u32 freq); | |
165 | int (*s_routing)(struct v4l2_subdev *sd, const struct v4l2_routing *route); | |
166 | }; | |
167 | ||
78a3b4db HV |
168 | /* |
169 | decode_vbi_line: video decoders that support sliced VBI need to implement | |
170 | this ioctl. Field p of the v4l2_sliced_vbi_line struct is set to the | |
171 | start of the VBI data that was generated by the decoder. The driver | |
172 | then parses the sliced VBI data and sets the other fields in the | |
173 | struct accordingly. The pointer p is updated to point to the start of | |
174 | the payload which can be copied verbatim into the data field of the | |
175 | v4l2_sliced_vbi_data struct. If no valid VBI data was found, then the | |
176 | type field is set to 0 on return. | |
177 | ||
178 | s_vbi_data: used to generate VBI signals on a video signal. | |
179 | v4l2_sliced_vbi_data is filled with the data packets that should be | |
180 | output. Note that if you set the line field to 0, then that VBI signal | |
181 | is disabled. If no valid VBI data was found, then the type field is | |
182 | set to 0 on return. | |
183 | ||
184 | g_vbi_data: used to obtain the sliced VBI packet from a readback register. | |
185 | Not all video decoders support this. If no data is available because | |
186 | the readback register contains invalid or erroneous data -EIO is | |
187 | returned. Note that you must fill in the 'id' member and the 'field' | |
188 | member (to determine whether CC data from the first or second field | |
189 | should be obtained). | |
190 | ||
191 | s_std_output: set v4l2_std_id for video OUTPUT devices. This is ignored by | |
192 | video input devices. | |
193 | ||
194 | s_crystal_freq: sets the frequency of the crystal used to generate the | |
195 | clocks. An extra flags field allows device specific configuration | |
196 | regarding clock frequency dividers, etc. If not used, then set flags | |
197 | to 0. If the frequency is not supported, then -EINVAL is returned. | |
198 | ||
199 | g_input_status: get input status. Same as the status field in the v4l2_input | |
200 | struct. | |
201 | ||
202 | s_routing: see s_routing in audio_ops, except this version is for video | |
203 | devices. | |
204 | */ | |
2a1fcdf0 HV |
205 | struct v4l2_subdev_video_ops { |
206 | int (*s_routing)(struct v4l2_subdev *sd, const struct v4l2_routing *route); | |
207 | int (*s_crystal_freq)(struct v4l2_subdev *sd, struct v4l2_crystal_freq *freq); | |
208 | int (*decode_vbi_line)(struct v4l2_subdev *sd, struct v4l2_decode_vbi_line *vbi_line); | |
209 | int (*s_vbi_data)(struct v4l2_subdev *sd, const struct v4l2_sliced_vbi_data *vbi_data); | |
210 | int (*g_vbi_data)(struct v4l2_subdev *sd, struct v4l2_sliced_vbi_data *vbi_data); | |
1fe2740f | 211 | int (*g_sliced_vbi_cap)(struct v4l2_subdev *sd, struct v4l2_sliced_vbi_cap *cap); |
2a1fcdf0 | 212 | int (*s_std_output)(struct v4l2_subdev *sd, v4l2_std_id std); |
1b6f1d96 HV |
213 | int (*querystd)(struct v4l2_subdev *sd, v4l2_std_id *std); |
214 | int (*g_input_status)(struct v4l2_subdev *sd, u32 *status); | |
2a1fcdf0 | 215 | int (*s_stream)(struct v4l2_subdev *sd, int enable); |
2da9479a | 216 | int (*enum_fmt)(struct v4l2_subdev *sd, struct v4l2_fmtdesc *fmtdesc); |
2a1fcdf0 | 217 | int (*g_fmt)(struct v4l2_subdev *sd, struct v4l2_format *fmt); |
2da9479a HV |
218 | int (*try_fmt)(struct v4l2_subdev *sd, struct v4l2_format *fmt); |
219 | int (*s_fmt)(struct v4l2_subdev *sd, struct v4l2_format *fmt); | |
220 | int (*g_parm)(struct v4l2_subdev *sd, struct v4l2_streamparm *param); | |
221 | int (*s_parm)(struct v4l2_subdev *sd, struct v4l2_streamparm *param); | |
4b2ce11a HV |
222 | int (*enum_framesizes)(struct v4l2_subdev *sd, struct v4l2_frmsizeenum *fsize); |
223 | int (*enum_frameintervals)(struct v4l2_subdev *sd, struct v4l2_frmivalenum *fival); | |
2a1fcdf0 HV |
224 | }; |
225 | ||
226 | struct v4l2_subdev_ops { | |
227 | const struct v4l2_subdev_core_ops *core; | |
228 | const struct v4l2_subdev_tuner_ops *tuner; | |
229 | const struct v4l2_subdev_audio_ops *audio; | |
230 | const struct v4l2_subdev_video_ops *video; | |
231 | }; | |
232 | ||
233 | #define V4L2_SUBDEV_NAME_SIZE 32 | |
234 | ||
235 | /* Each instance of a subdev driver should create this struct, either | |
236 | stand-alone or embedded in a larger struct. | |
237 | */ | |
238 | struct v4l2_subdev { | |
239 | struct list_head list; | |
240 | struct module *owner; | |
b0167600 | 241 | struct v4l2_device *v4l2_dev; |
2a1fcdf0 HV |
242 | const struct v4l2_subdev_ops *ops; |
243 | /* name must be unique */ | |
244 | char name[V4L2_SUBDEV_NAME_SIZE]; | |
245 | /* can be used to group similar subdevs, value is driver-specific */ | |
246 | u32 grp_id; | |
247 | /* pointer to private data */ | |
248 | void *priv; | |
249 | }; | |
250 | ||
251 | static inline void v4l2_set_subdevdata(struct v4l2_subdev *sd, void *p) | |
252 | { | |
253 | sd->priv = p; | |
254 | } | |
255 | ||
256 | static inline void *v4l2_get_subdevdata(const struct v4l2_subdev *sd) | |
257 | { | |
258 | return sd->priv; | |
259 | } | |
260 | ||
2a1fcdf0 HV |
261 | static inline void v4l2_subdev_init(struct v4l2_subdev *sd, |
262 | const struct v4l2_subdev_ops *ops) | |
263 | { | |
264 | INIT_LIST_HEAD(&sd->list); | |
265 | /* ops->core MUST be set */ | |
266 | BUG_ON(!ops || !ops->core); | |
267 | sd->ops = ops; | |
b0167600 | 268 | sd->v4l2_dev = NULL; |
2a1fcdf0 HV |
269 | sd->name[0] = '\0'; |
270 | sd->grp_id = 0; | |
271 | sd->priv = NULL; | |
272 | } | |
273 | ||
274 | /* Call an ops of a v4l2_subdev, doing the right checks against | |
275 | NULL pointers. | |
276 | ||
277 | Example: err = v4l2_subdev_call(sd, core, g_chip_ident, &chip); | |
278 | */ | |
279 | #define v4l2_subdev_call(sd, o, f, args...) \ | |
280 | (!(sd) ? -ENODEV : (((sd) && (sd)->ops->o && (sd)->ops->o->f) ? \ | |
281 | (sd)->ops->o->f((sd) , ##args) : -ENOIOCTLCMD)) | |
282 | ||
98ec6339 HV |
283 | /* Send a notification to v4l2_device. */ |
284 | #define v4l2_subdev_notify(sd, notification, arg) \ | |
285 | ((!(sd) || !(sd)->v4l2_dev || !(sd)->v4l2_dev->notify) ? -ENODEV : \ | |
286 | (sd)->v4l2_dev->notify((sd), (notification), (arg))) | |
287 | ||
2a1fcdf0 | 288 | #endif |