summaryrefslogtreecommitdiffstats
path: root/kernel/include/media/soc_camera.h
blob: 2f6261f3e570efed869166a37625ef1869cc2a09 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
/*
 * camera image capture (abstract) bus driver header
 *
 * Copyright (C) 2006, Sascha Hauer, Pengutronix
 * Copyright (C) 2008, Guennadi Liakhovetski <kernel@pengutronix.de>
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License version 2 as
 * published by the Free Software Foundation.
 */

#ifndef SOC_CAMERA_H
#define SOC_CAMERA_H

#include <linux/bitops.h>
#include <linux/device.h>
#include <linux/mutex.h>
#include <linux/pm.h>
#include <linux/videodev2.h>
#include <media/videobuf-core.h>
#include <media/videobuf2-core.h>
#include <media/v4l2-async.h>
#include <media/v4l2-ctrls.h>
#include <media/v4l2-device.h>

struct file;
struct soc_camera_desc;
struct soc_camera_async_client;

struct soc_camera_device {
	struct list_head list;		/* list of all registered devices */
	struct soc_camera_desc *sdesc;
	struct device *pdev;		/* Platform device */
	struct device *parent;		/* Camera host device */
	struct device *control;		/* E.g., the i2c client */
	s32 user_width;
	s32 user_height;
	u32 bytesperline;		/* for padding, zero if unused */
	u32 sizeimage;
	enum v4l2_colorspace colorspace;
	unsigned char iface;		/* Host number */
	unsigned char devnum;		/* Device number per host */
	struct soc_camera_sense *sense;	/* See comment in struct definition */
	struct video_device *vdev;
	struct v4l2_ctrl_handler ctrl_handler;
	const struct soc_camera_format_xlate *current_fmt;
	struct soc_camera_format_xlate *user_formats;
	int num_user_formats;
	enum v4l2_field field;		/* Preserve field over close() */
	void *host_priv;		/* Per-device host private data */
	/* soc_camera.c private count. Only accessed with .host_lock held */
	int use_count;
	struct file *streamer;		/* stream owner */
	struct v4l2_clk *clk;
	/* Asynchronous subdevice management */
	struct soc_camera_async_client *sasc;
	/* video buffer queue */
	union {
		struct videobuf_queue vb_vidq;
		struct vb2_queue vb2_vidq;
	};
};

/* Host supports programmable stride */
#define SOCAM_HOST_CAP_STRIDE		(1 << 0)

enum soc_camera_subdev_role {
	SOCAM_SUBDEV_DATA_SOURCE = 1,
	SOCAM_SUBDEV_DATA_SINK,
	SOCAM_SUBDEV_DATA_PROCESSOR,
};

struct soc_camera_async_subdev {
	struct v4l2_async_subdev asd;
	enum soc_camera_subdev_role role;
};

struct soc_camera_host {
	struct v4l2_device v4l2_dev;
	struct list_head list;
	struct mutex host_lock;		/* Main synchronisation lock */
	struct mutex clk_lock;		/* Protect pipeline modifications */
	unsigned char nr;		/* Host number */
	u32 capabilities;
	struct soc_camera_device *icd;	/* Currently attached client */
	void *priv;
	const char *drv_name;
	struct soc_camera_host_ops *ops;
	struct v4l2_async_subdev **asd;	/* Flat array, arranged in groups */
	unsigned int *asd_sizes;	/* 0-terminated array of asd group sizes */
};

struct soc_camera_host_ops {
	struct module *owner;
	int (*add)(struct soc_camera_device *);
	void (*remove)(struct soc_camera_device *);
	int (*clock_start)(struct soc_camera_host *);
	void (*clock_stop)(struct soc_camera_host *);
	/*
	 * .get_formats() is called for each client device format, but
	 * .put_formats() is only called once. Further, if any of the calls to
	 * .get_formats() fail, .put_formats() will not be called at all, the
	 * failing .get_formats() must then clean up internally.
	 */
	int (*get_formats)(struct soc_camera_device *, unsigned int,
			   struct soc_camera_format_xlate *);
	void (*put_formats)(struct soc_camera_device *);
	int (*cropcap)(struct soc_camera_device *, struct v4l2_cropcap *);
	int (*get_crop)(struct soc_camera_device *, struct v4l2_crop *);
	int (*set_crop)(struct soc_camera_device *, const struct v4l2_crop *);
	int (*get_selection)(struct soc_camera_device *, struct v4l2_selection *);
	int (*set_selection)(struct soc_camera_device *, struct v4l2_selection *);
	/*
	 * The difference to .set_crop() is, that .set_livecrop is not allowed
	 * to change the output sizes
	 */
	int (*set_livecrop)(struct soc_camera_device *, const struct v4l2_crop *);
	int (*set_fmt)(struct soc_camera_device *, struct v4l2_format *);
	int (*try_fmt)(struct soc_camera_device *, struct v4l2_format *);
	void (*init_videobuf)(struct videobuf_queue *,
			      struct soc_camera_device *);
	int (*init_videobuf2)(struct vb2_queue *,
			      struct soc_camera_device *);
	int (*reqbufs)(struct soc_camera_device *, struct v4l2_requestbuffers *);
	int (*querycap)(struct soc_camera_host *, struct v4l2_capability *);
	int (*set_bus_param)(struct soc_camera_device *);
	int (*get_parm)(struct soc_camera_device *, struct v4l2_streamparm *);
	int (*set_parm)(struct soc_camera_device *, struct v4l2_streamparm *);
	int (*enum_framesizes)(struct soc_camera_device *, struct v4l2_frmsizeenum *);
	unsigned int (*poll)(struct file *, poll_table *);
};

#define SOCAM_SENSOR_INVERT_PCLK	(1 << 0)
#define SOCAM_SENSOR_INVERT_MCLK	(1 << 1)
#define SOCAM_SENSOR_INVERT_HSYNC	(1 << 2)
#define SOCAM_SENSOR_INVERT_VSYNC	(1 << 3)
#define SOCAM_SENSOR_INVERT_DATA	(1 << 4)

struct i2c_board_info;
struct regulator_bulk_data;

struct soc_camera_subdev_desc {
	/* Per camera SOCAM_SENSOR_* bus flags */
	unsigned long flags;

	/* sensor driver private platform data */
	void *drv_priv;

	/*
	 * Set unbalanced_power to true to deal with legacy drivers, failing to
	 * balance their calls to subdevice's .s_power() method. clock_state is
	 * then used internally by helper functions, it shouldn't be touched by
	 * drivers or the platform code.
	 */
	bool unbalanced_power;
	unsigned long clock_state;

	/* Optional callbacks to power on or off and reset the sensor */
	int (*power)(struct device *, int);
	int (*reset)(struct device *);

	/*
	 * some platforms may support different data widths than the sensors
	 * native ones due to different data line routing. Let the board code
	 * overwrite the width flags.
	 */
	int (*set_bus_param)(struct soc_camera_subdev_desc *, unsigned long flags);
	unsigned long (*query_bus_param)(struct soc_camera_subdev_desc *);
	void (*free_bus)(struct soc_camera_subdev_desc *);

	/* Optional regulators that have to be managed on power on/off events */
	struct v4l2_subdev_platform_data sd_pdata;
};

struct soc_camera_host_desc {
	/* Camera bus id, used to match a camera and a bus */
	int bus_id;
	int i2c_adapter_id;
	struct i2c_board_info *board_info;
	const char *module_name;

	/*
	 * For non-I2C devices platform has to provide methods to add a device
	 * to the system and to remove it
	 */
	int (*add_device)(struct soc_camera_device *);
	void (*del_device)(struct soc_camera_device *);
};

/*
 * Platform data for "soc-camera-pdrv"
 * This MUST be kept binary-identical to struct soc_camera_link below, until
 * it is completely replaced by this one, after which we can split it into its
 * two components.
 */
struct soc_camera_desc {
	struct soc_camera_subdev_desc subdev_desc;
	struct soc_camera_host_desc host_desc;
};

/* Prepare to replace this struct: don't change its layout any more! */
struct soc_camera_link {
	/*
	 * Subdevice part - keep at top and compatible to
	 * struct soc_camera_subdev_desc
	 */

	/* Per camera SOCAM_SENSOR_* bus flags */
	unsigned long flags;

	void *priv;

	/* Set by platforms to handle misbehaving drivers */
	bool unbalanced_power;
	/* Used by soc-camera helper functions */
	unsigned long clock_state;

	/* Optional callbacks to power on or off and reset the sensor */
	int (*power)(struct device *, int);
	int (*reset)(struct device *);
	/*
	 * some platforms may support different data widths than the sensors
	 * native ones due to different data line routing. Let the board code
	 * overwrite the width flags.
	 */
	int (*set_bus_param)(struct soc_camera_link *, unsigned long flags);
	unsigned long (*query_bus_param)(struct soc_camera_link *);
	void (*free_bus)(struct soc_camera_link *);

	/* Optional regulators that have to be managed on power on/off events */
	struct regulator_bulk_data *regulators;
	int num_regulators;

	void *host_priv;

	/*
	 * Host part - keep at bottom and compatible to
	 * struct soc_camera_host_desc
	 */

	/* Camera bus id, used to match a camera and a bus */
	int bus_id;
	int i2c_adapter_id;
	struct i2c_board_info *board_info;
	const char *module_name;

	/*
	 * For non-I2C devices platform has to provide methods to add a device
	 * to the system and to remove it
	 */
	int (*add_device)(struct soc_camera_device *);
	void (*del_device)(struct soc_camera_device *);
};

static inline struct soc_camera_host *to_soc_camera_host(
	const struct device *dev)
{
	struct v4l2_device *v4l2_dev = dev_get_drvdata(dev);

	return container_of(v4l2_dev, struct soc_camera_host, v4l2_dev);
}

static inline struct soc_camera_desc *to_soc_camera_desc(
	const struct soc_camera_device *icd)
{
	return icd->sdesc;
}

static inline struct device *to_soc_camera_control(
	const struct soc_camera_device *icd)
{
	return icd->control;
}

static inline struct v4l2_subdev *soc_camera_to_subdev(
	const struct soc_camera_device *icd)
{
	struct device *control = to_soc_camera_control(icd);
	return dev_get_drvdata(control);
}

int soc_camera_host_register(struct soc_camera_host *ici);
void soc_camera_host_unregister(struct soc_camera_host *ici);

const struct soc_camera_format_xlate *soc_camera_xlate_by_fourcc(
	struct soc_camera_device *icd, unsigned int fourcc);

/**
 * struct soc_camera_format_xlate - match between host and sensor formats
 * @code: code of a sensor provided format
 * @host_fmt: host format after host translation from code
 *
 * Host and sensor translation structure. Used in table of host and sensor
 * formats matchings in soc_camera_device. A host can override the generic list
 * generation by implementing get_formats(), and use it for format checks and
 * format setup.
 */
struct soc_camera_format_xlate {
	u32 code;
	const struct soc_mbus_pixelfmt *host_fmt;
};

#define SOCAM_SENSE_PCLK_CHANGED	(1 << 0)

/**
 * This struct can be attached to struct soc_camera_device by the host driver
 * to request sense from the camera, for example, when calling .set_fmt(). The
 * host then can check which flags are set and verify respective values if any.
 * For example, if SOCAM_SENSE_PCLK_CHANGED is set, it means, pixclock has
 * changed during this operation. After completion the host should detach sense.
 *
 * @flags		ored SOCAM_SENSE_* flags
 * @master_clock	if the host wants to be informed about pixel-clock
 *			change, it better set master_clock.
 * @pixel_clock_max	maximum pixel clock frequency supported by the host,
 *			camera is not allowed to exceed this.
 * @pixel_clock		if the camera driver changed pixel clock during this
 *			operation, it sets SOCAM_SENSE_PCLK_CHANGED, uses
 *			master_clock to calculate the new pixel-clock and
 *			sets this field.
 */
struct soc_camera_sense {
	unsigned long flags;
	unsigned long master_clock;
	unsigned long pixel_clock_max;
	unsigned long pixel_clock;
};

#define SOCAM_DATAWIDTH(x)	BIT((x) - 1)
#define SOCAM_DATAWIDTH_4	SOCAM_DATAWIDTH(4)
#define SOCAM_DATAWIDTH_8	SOCAM_DATAWIDTH(8)
#define SOCAM_DATAWIDTH_9	SOCAM_DATAWIDTH(9)
#define SOCAM_DATAWIDTH_10	SOCAM_DATAWIDTH(10)
#define SOCAM_DATAWIDTH_12	SOCAM_DATAWIDTH(12)
#define SOCAM_DATAWIDTH_15	SOCAM_DATAWIDTH(15)
#define SOCAM_DATAWIDTH_16	SOCAM_DATAWIDTH(16)
#define SOCAM_DATAWIDTH_18	SOCAM_DATAWIDTH(18)
#define SOCAM_DATAWIDTH_24	SOCAM_DATAWIDTH(24)

#define SOCAM_DATAWIDTH_MASK (SOCAM_DATAWIDTH_4 | SOCAM_DATAWIDTH_8 | \
			      SOCAM_DATAWIDTH_9 | SOCAM_DATAWIDTH_10 | \
			      SOCAM_DATAWIDTH_12 | SOCAM_DATAWIDTH_15 | \
			      SOCAM_DATAWIDTH_16 | SOCAM_DATAWIDTH_18 | \
			      SOCAM_DATAWIDTH_24)

static inline void soc_camera_limit_side(int *start, int *length,
		unsigned int start_min,
		unsigned int length_min, unsigned int length_max)
{
	if (*length < length_min)
		*length = length_min;
	else if (*length > length_max)
		*length = length_max;

	if (*start < start_min)
		*start = start_min;
	else if (*start > start_min + length_max - *length)
		*start = start_min + length_max - *length;
}

unsigned long soc_camera_apply_board_flags(struct soc_camera_subdev_desc *ssdd,
					   const struct v4l2_mbus_config *cfg);

int soc_camera_power_init(struct device *dev, struct soc_camera_subdev_desc *ssdd);
int soc_camera_power_on(struct device *dev, struct soc_camera_subdev_desc *ssdd,
			struct v4l2_clk *clk);
int soc_camera_power_off(struct device *dev, struct soc_camera_subdev_desc *ssdd,
			 struct v4l2_clk *clk);

static inline int soc_camera_set_power(struct device *dev,
		struct soc_camera_subdev_desc *ssdd, struct v4l2_clk *clk, bool on)
{
	return on ? soc_camera_power_on(dev, ssdd, clk)
		  : soc_camera_power_off(dev, ssdd, clk);
}

/* This is only temporary here - until v4l2-subdev begins to link to video_device */
#include <linux/i2c.h>
static inline struct video_device *soc_camera_i2c_to_vdev(const struct i2c_client *client)
{
	struct v4l2_subdev *sd = i2c_get_clientdata(client);
	struct soc_camera_device *icd = v4l2_get_subdev_hostdata(sd);
	return icd ? icd->vdev : NULL;
}

static inline struct soc_camera_subdev_desc *soc_camera_i2c_to_desc(const struct i2c_client *client)
{
	return client->dev.platform_data;
}

static inline struct v4l2_subdev *soc_camera_vdev_to_subdev(struct video_device *vdev)
{
	struct soc_camera_device *icd = video_get_drvdata(vdev);
	return soc_camera_to_subdev(icd);
}

static inline struct soc_camera_device *soc_camera_from_vb2q(const struct vb2_queue *vq)
{
	return container_of(vq, struct soc_camera_device, vb2_vidq);
}

static inline struct soc_camera_device *soc_camera_from_vbq(const struct videobuf_queue *vq)
{
	return container_of(vq, struct soc_camera_device, vb_vidq);
}

static inline u32 soc_camera_grp_id(const struct soc_camera_device *icd)
{
	return (icd->iface << 8) | (icd->devnum + 1);
}

void soc_camera_lock(struct vb2_queue *vq);
void soc_camera_unlock(struct vb2_queue *vq);

#endif