2 V4L2 sub-device support header.
4 Copyright (C) 2008 Hans Verkuil <hverkuil@xs4all.nl>
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.
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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.
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21 #ifndef _V4L2_SUBDEV_H
22 #define _V4L2_SUBDEV_H
24 #include <media/v4l2-common.h>
26 /* generic v4l2_device notify callback notification values */
27 #define V4L2_SUBDEV_IR_RX_NOTIFY _IOW('v', 0, u32)
28 #define V4L2_SUBDEV_IR_RX_FIFO_SERVICE_REQ 0x00000001
29 #define V4L2_SUBDEV_IR_RX_END_OF_RX_DETECTED 0x00000002
30 #define V4L2_SUBDEV_IR_RX_HW_FIFO_OVERRUN 0x00000004
31 #define V4L2_SUBDEV_IR_RX_SW_FIFO_OVERRUN 0x00000008
33 #define V4L2_SUBDEV_IR_TX_NOTIFY _IOW('v', 1, u32)
34 #define V4L2_SUBDEV_IR_TX_FIFO_SERVICE_REQ 0x00000001
41 struct v4l2_decode_vbi_line {
42 u32 is_second_field; /* Set to 0 for the first (odd) field,
43 set to 1 for the second (even) field. */
44 u8 *p; /* Pointer to the sliced VBI data from the decoder.
45 On exit points to the start of the payload. */
46 u32 line; /* Line number of the sliced VBI data (1-23) */
47 u32 type; /* VBI service type (V4L2_SLICED_*). 0 if no service found */
50 /* Sub-devices are devices that are connected somehow to the main bridge
51 device. These devices are usually audio/video muxers/encoders/decoders or
52 sensors and webcam controllers.
54 Usually these devices are controlled through an i2c bus, but other busses
57 The v4l2_subdev struct provides a way of accessing these devices in a
58 generic manner. Most operations that these sub-devices support fall in
59 a few categories: core ops, audio ops, video ops and tuner ops.
61 More categories can be added if needed, although this should remain a
62 limited set (no more than approx. 8 categories).
64 Each category has its own set of ops that subdev drivers can implement.
66 A subdev driver can leave the pointer to the category ops NULL if
67 it does not implement them (e.g. an audio subdev will generally not
68 implement the video category ops). The exception is the core category:
69 this must always be present.
71 These ops are all used internally so it is no problem to change, remove
72 or add ops or move ops from one to another category. Currently these
73 ops are based on the original ioctls, but since ops are not limited to
74 one argument there is room for improvement here once all i2c subdev
75 drivers are converted to use these ops.
78 /* Core ops: it is highly recommended to implement at least these ops:
85 This provides basic debugging support.
87 The ioctl ops is meant for generic ioctl-like commands. Depending on
88 the use-case it might be better to use subdev-specific ops (currently
89 not yet implemented) since ops provide proper type-checking.
92 /* s_config: if set, then it is always called by the v4l2_i2c_new_subdev*
93 functions after the v4l2_subdev was registered. It is used to pass
94 platform data to the subdev which can be used during initialization.
96 init: initialize the sensor registors to some sort of reasonable default
97 values. Do not use for new drivers and should be removed in existing
100 load_fw: load firmware.
102 reset: generic reset command. The argument selects which subsystems to
103 reset. Passing 0 will always reset the whole chip. Do not use for new
104 drivers without discussing this first on the linux-media mailinglist.
105 There should be no reason normally to reset a device.
107 s_gpio: set GPIO pins. Very simple right now, might need to be extended with
108 a direction argument if needed.
110 struct v4l2_subdev_core_ops {
111 int (*g_chip_ident)(struct v4l2_subdev *sd, struct v4l2_dbg_chip_ident *chip);
112 int (*log_status)(struct v4l2_subdev *sd);
113 int (*s_config)(struct v4l2_subdev *sd, int irq, void *platform_data);
114 int (*init)(struct v4l2_subdev *sd, u32 val);
115 int (*load_fw)(struct v4l2_subdev *sd);
116 int (*reset)(struct v4l2_subdev *sd, u32 val);
117 int (*s_gpio)(struct v4l2_subdev *sd, u32 val);
118 int (*queryctrl)(struct v4l2_subdev *sd, struct v4l2_queryctrl *qc);
119 int (*g_ctrl)(struct v4l2_subdev *sd, struct v4l2_control *ctrl);
120 int (*s_ctrl)(struct v4l2_subdev *sd, struct v4l2_control *ctrl);
121 int (*g_ext_ctrls)(struct v4l2_subdev *sd, struct v4l2_ext_controls *ctrls);
122 int (*s_ext_ctrls)(struct v4l2_subdev *sd, struct v4l2_ext_controls *ctrls);
123 int (*try_ext_ctrls)(struct v4l2_subdev *sd, struct v4l2_ext_controls *ctrls);
124 int (*querymenu)(struct v4l2_subdev *sd, struct v4l2_querymenu *qm);
125 int (*s_std)(struct v4l2_subdev *sd, v4l2_std_id norm);
126 long (*ioctl)(struct v4l2_subdev *sd, unsigned int cmd, void *arg);
127 #ifdef CONFIG_VIDEO_ADV_DEBUG
128 int (*g_register)(struct v4l2_subdev *sd, struct v4l2_dbg_register *reg);
129 int (*s_register)(struct v4l2_subdev *sd, struct v4l2_dbg_register *reg);
133 /* s_mode: switch the tuner to a specific tuner mode. Replacement of s_radio.
135 s_radio: v4l device was opened in Radio mode, to be replaced by s_mode.
137 s_type_addr: sets tuner type and its I2C addr.
139 s_config: sets tda9887 specific stuff, like port1, port2 and qss
141 s_standby: puts tuner on powersaving state, disabling it, except for i2c.
143 struct v4l2_subdev_tuner_ops {
144 int (*s_mode)(struct v4l2_subdev *sd, enum v4l2_tuner_type);
145 int (*s_radio)(struct v4l2_subdev *sd);
146 int (*s_frequency)(struct v4l2_subdev *sd, struct v4l2_frequency *freq);
147 int (*g_frequency)(struct v4l2_subdev *sd, struct v4l2_frequency *freq);
148 int (*g_tuner)(struct v4l2_subdev *sd, struct v4l2_tuner *vt);
149 int (*s_tuner)(struct v4l2_subdev *sd, struct v4l2_tuner *vt);
150 int (*g_modulator)(struct v4l2_subdev *sd, struct v4l2_modulator *vm);
151 int (*s_modulator)(struct v4l2_subdev *sd, struct v4l2_modulator *vm);
152 int (*s_type_addr)(struct v4l2_subdev *sd, struct tuner_setup *type);
153 int (*s_config)(struct v4l2_subdev *sd, const struct v4l2_priv_tun_config *config);
154 int (*s_standby)(struct v4l2_subdev *sd);
157 /* s_clock_freq: set the frequency (in Hz) of the audio clock output.
158 Used to slave an audio processor to the video decoder, ensuring that
159 audio and video remain synchronized. Usual values for the frequency
160 are 48000, 44100 or 32000 Hz. If the frequency is not supported, then
163 s_i2s_clock_freq: sets I2S speed in bps. This is used to provide a standard
164 way to select I2S clock used by driving digital audio streams at some
165 board designs. Usual values for the frequency are 1024000 and 2048000.
166 If the frequency is not supported, then -EINVAL is returned.
168 s_routing: used to define the input and/or output pins of an audio chip,
169 and any additional configuration data.
170 Never attempt to use user-level input IDs (e.g. Composite, S-Video,
171 Tuner) at this level. An i2c device shouldn't know about whether an
172 input pin is connected to a Composite connector, become on another
173 board or platform it might be connected to something else entirely.
174 The calling driver is responsible for mapping a user-level input to
175 the right pins on the i2c device.
177 struct v4l2_subdev_audio_ops {
178 int (*s_clock_freq)(struct v4l2_subdev *sd, u32 freq);
179 int (*s_i2s_clock_freq)(struct v4l2_subdev *sd, u32 freq);
180 int (*s_routing)(struct v4l2_subdev *sd, u32 input, u32 output, u32 config);
184 decode_vbi_line: video decoders that support sliced VBI need to implement
185 this ioctl. Field p of the v4l2_sliced_vbi_line struct is set to the
186 start of the VBI data that was generated by the decoder. The driver
187 then parses the sliced VBI data and sets the other fields in the
188 struct accordingly. The pointer p is updated to point to the start of
189 the payload which can be copied verbatim into the data field of the
190 v4l2_sliced_vbi_data struct. If no valid VBI data was found, then the
191 type field is set to 0 on return.
193 s_vbi_data: used to generate VBI signals on a video signal.
194 v4l2_sliced_vbi_data is filled with the data packets that should be
195 output. Note that if you set the line field to 0, then that VBI signal
196 is disabled. If no valid VBI data was found, then the type field is
199 g_vbi_data: used to obtain the sliced VBI packet from a readback register.
200 Not all video decoders support this. If no data is available because
201 the readback register contains invalid or erroneous data -EIO is
202 returned. Note that you must fill in the 'id' member and the 'field'
203 member (to determine whether CC data from the first or second field
206 s_std_output: set v4l2_std_id for video OUTPUT devices. This is ignored by
209 s_crystal_freq: sets the frequency of the crystal used to generate the
210 clocks in Hz. An extra flags field allows device specific configuration
211 regarding clock frequency dividers, etc. If not used, then set flags
212 to 0. If the frequency is not supported, then -EINVAL is returned.
214 g_input_status: get input status. Same as the status field in the v4l2_input
217 s_routing: see s_routing in audio_ops, except this version is for video
220 struct v4l2_subdev_video_ops {
221 int (*s_routing)(struct v4l2_subdev *sd, u32 input, u32 output, u32 config);
222 int (*s_crystal_freq)(struct v4l2_subdev *sd, u32 freq, u32 flags);
223 int (*decode_vbi_line)(struct v4l2_subdev *sd, struct v4l2_decode_vbi_line *vbi_line);
224 int (*s_vbi_data)(struct v4l2_subdev *sd, const struct v4l2_sliced_vbi_data *vbi_data);
225 int (*g_vbi_data)(struct v4l2_subdev *sd, struct v4l2_sliced_vbi_data *vbi_data);
226 int (*g_sliced_vbi_cap)(struct v4l2_subdev *sd, struct v4l2_sliced_vbi_cap *cap);
227 int (*s_std_output)(struct v4l2_subdev *sd, v4l2_std_id std);
228 int (*querystd)(struct v4l2_subdev *sd, v4l2_std_id *std);
229 int (*g_input_status)(struct v4l2_subdev *sd, u32 *status);
230 int (*s_stream)(struct v4l2_subdev *sd, int enable);
231 int (*enum_fmt)(struct v4l2_subdev *sd, struct v4l2_fmtdesc *fmtdesc);
232 int (*g_fmt)(struct v4l2_subdev *sd, struct v4l2_format *fmt);
233 int (*try_fmt)(struct v4l2_subdev *sd, struct v4l2_format *fmt);
234 int (*s_fmt)(struct v4l2_subdev *sd, struct v4l2_format *fmt);
235 int (*cropcap)(struct v4l2_subdev *sd, struct v4l2_cropcap *cc);
236 int (*g_crop)(struct v4l2_subdev *sd, struct v4l2_crop *crop);
237 int (*s_crop)(struct v4l2_subdev *sd, struct v4l2_crop *crop);
238 int (*g_parm)(struct v4l2_subdev *sd, struct v4l2_streamparm *param);
239 int (*s_parm)(struct v4l2_subdev *sd, struct v4l2_streamparm *param);
240 int (*enum_framesizes)(struct v4l2_subdev *sd, struct v4l2_frmsizeenum *fsize);
241 int (*enum_frameintervals)(struct v4l2_subdev *sd, struct v4l2_frmivalenum *fival);
245 interrupt_service_routine: Called by the bridge chip's interrupt service
246 handler, when an IR interrupt status has be raised due to this subdev,
247 so that this subdev can handle the details. It may schedule work to be
248 performed later. It must not sleep. *Called from an IRQ context*.
250 [rt]x_g_parameters: Get the current operating parameters and state of the
251 the IR receiver or transmitter.
253 [rt]x_s_parameters: Set the current operating parameters and state of the
254 the IR receiver or transmitter. It is recommended to call
255 [rt]x_g_parameters first to fill out the current state, and only change
256 the fields that need to be changed. Upon return, the actual device
257 operating parameters and state will be returned. Note that hardware
258 limitations may prevent the actual settings from matching the requested
259 settings - e.g. an actual carrier setting of 35,904 Hz when 36,000 Hz
260 was requested. An exception is when the shutdown parameter is true.
261 The last used operational parameters will be returned, but the actual
262 state of the hardware be different to minimize power consumption and
263 processing when shutdown is true.
265 rx_read: Reads received codes or pulse width data.
266 The semantics are similar to a non-blocking read() call.
268 tx_write: Writes codes or pulse width data for transmission.
269 The semantics are similar to a non-blocking write() call.
272 enum v4l2_subdev_ir_mode {
273 V4L2_SUBDEV_IR_MODE_PULSE_WIDTH, /* space & mark widths in nanosecs */
276 /* Data format of data read or written for V4L2_SUBDEV_IR_MODE_PULSE_WIDTH */
277 #define V4L2_SUBDEV_IR_PULSE_MAX_WIDTH_NS 0x7fffffff
278 #define V4L2_SUBDEV_IR_PULSE_LEVEL_MASK 0x80000000
279 #define V4L2_SUBDEV_IR_PULSE_RX_SEQ_END 0xffffffff
281 struct v4l2_subdev_ir_parameters {
282 /* Either Rx or Tx */
283 unsigned int bytes_per_data_element; /* of data in read or write call */
284 enum v4l2_subdev_ir_mode mode;
287 bool interrupt_enable;
288 bool shutdown; /* true: set hardware to low/no power, false: normal */
290 bool modulation; /* true: uses carrier, false: baseband */
291 u32 max_pulse_width; /* ns, valid only for baseband signal */
292 unsigned int carrier_freq; /* Hz, valid only for modulated signal*/
293 unsigned int duty_cycle; /* percent, valid only for modulated signal*/
294 bool invert; /* logically invert sense of mark/space */
297 u32 noise_filter_min_width; /* ns, min time of a valid pulse */
298 unsigned int carrier_range_lower; /* Hz, valid only for modulated sig */
299 unsigned int carrier_range_upper; /* Hz, valid only for modulated sig */
300 u32 resolution; /* ns */
303 struct v4l2_subdev_ir_ops {
304 /* Common to receiver and transmitter */
305 int (*interrupt_service_routine)(struct v4l2_subdev *sd,
306 u32 status, bool *handled);
309 int (*rx_read)(struct v4l2_subdev *sd, u8 *buf, size_t count,
312 int (*rx_g_parameters)(struct v4l2_subdev *sd,
313 struct v4l2_subdev_ir_parameters *params);
314 int (*rx_s_parameters)(struct v4l2_subdev *sd,
315 struct v4l2_subdev_ir_parameters *params);
318 int (*tx_write)(struct v4l2_subdev *sd, u8 *buf, size_t count,
321 int (*tx_g_parameters)(struct v4l2_subdev *sd,
322 struct v4l2_subdev_ir_parameters *params);
323 int (*tx_s_parameters)(struct v4l2_subdev *sd,
324 struct v4l2_subdev_ir_parameters *params);
327 struct v4l2_subdev_ops {
328 const struct v4l2_subdev_core_ops *core;
329 const struct v4l2_subdev_tuner_ops *tuner;
330 const struct v4l2_subdev_audio_ops *audio;
331 const struct v4l2_subdev_video_ops *video;
332 const struct v4l2_subdev_ir_ops *ir;
335 #define V4L2_SUBDEV_NAME_SIZE 32
337 /* Set this flag if this subdev is a i2c device. */
338 #define V4L2_SUBDEV_FL_IS_I2C (1U << 0)
340 /* Each instance of a subdev driver should create this struct, either
341 stand-alone or embedded in a larger struct.
344 struct list_head list;
345 struct module *owner;
347 struct v4l2_device *v4l2_dev;
348 const struct v4l2_subdev_ops *ops;
349 /* name must be unique */
350 char name[V4L2_SUBDEV_NAME_SIZE];
351 /* can be used to group similar subdevs, value is driver-specific */
353 /* pointer to private data */
357 static inline void v4l2_set_subdevdata(struct v4l2_subdev *sd, void *p)
362 static inline void *v4l2_get_subdevdata(const struct v4l2_subdev *sd)
367 static inline void v4l2_subdev_init(struct v4l2_subdev *sd,
368 const struct v4l2_subdev_ops *ops)
370 INIT_LIST_HEAD(&sd->list);
371 /* ops->core MUST be set */
372 BUG_ON(!ops || !ops->core);
381 /* Call an ops of a v4l2_subdev, doing the right checks against
384 Example: err = v4l2_subdev_call(sd, core, g_chip_ident, &chip);
386 #define v4l2_subdev_call(sd, o, f, args...) \
387 (!(sd) ? -ENODEV : (((sd) && (sd)->ops->o && (sd)->ops->o->f) ? \
388 (sd)->ops->o->f((sd) , ##args) : -ENOIOCTLCMD))
390 /* Send a notification to v4l2_device. */
391 #define v4l2_subdev_notify(sd, notification, arg) \
392 ((!(sd) || !(sd)->v4l2_dev || !(sd)->v4l2_dev->notify) ? -ENODEV : \
393 (sd)->v4l2_dev->notify((sd), (notification), (arg)))