summaryrefslogtreecommitdiffstats
path: root/drivers/media/i2c/m5mols/m5mols_capture.c
blob: ab34ccedf31ea7a1a72adfe9d3324103de92b7f7 (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

/*
 * The Capture code for Fujitsu M-5MOLS ISP
 *
 * Copyright (C) 2011 Samsung Electronics Co., Ltd.
 * Author: HeungJun Kim <riverful.kim@samsung.com>
 *
 * Copyright (C) 2009 Samsung Electronics Co., Ltd.
 * Author: Dongsoo Nathaniel Kim <dongsoo45.kim@samsung.com>
 *
 * 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.
 */

#include <linux/i2c.h>
#include <linux/slab.h>
#include <linux/irq.h>
#include <linux/interrupt.h>
#include <linux/delay.h>
#include <linux/gpio.h>
#include <linux/regulator/consumer.h>
#include <linux/videodev2.h>
#include <media/v4l2-ctrls.h>
#include <media/v4l2-device.h>
#include <media/v4l2-subdev.h>
#include <media/m5mols.h>
#include <media/s5p_fimc.h>

#include "m5mols.h"
#include "m5mols_reg.h"

/**
 * m5mols_read_rational - I2C read of a rational number
 *
 * Read numerator and denominator from registers @addr_num and @addr_den
 * respectively and return the division result in @val.
 */
static int m5mols_read_rational(struct v4l2_subdev *sd, u32 addr_num,
				u32 addr_den, u32 *val)
{
	u32 num, den;

	int ret = m5mols_read_u32(sd, addr_num, &num);
	if (!ret)
		ret = m5mols_read_u32(sd, addr_den, &den);
	if (ret)
		return ret;
	*val = den == 0 ? 0 : num / den;
	return ret;
}

/**
 * m5mols_capture_info - Gather captured image information
 *
 * For now it gathers only EXIF information and file size.
 */
static int m5mols_capture_info(struct m5mols_info *info)
{
	struct m5mols_exif *exif = &info->cap.exif;
	struct v4l2_subdev *sd = &info->sd;
	int ret;

	ret = m5mols_read_rational(sd, EXIF_INFO_EXPTIME_NU,
				   EXIF_INFO_EXPTIME_DE, &exif->exposure_time);
	if (ret)
		return ret;
	ret = m5mols_read_rational(sd, EXIF_INFO_TV_NU, EXIF_INFO_TV_DE,
				   &exif->shutter_speed);
	if (ret)
		return ret;
	ret = m5mols_read_rational(sd, EXIF_INFO_AV_NU, EXIF_INFO_AV_DE,
				   &exif->aperture);
	if (ret)
		return ret;
	ret = m5mols_read_rational(sd, EXIF_INFO_BV_NU, EXIF_INFO_BV_DE,
				   &exif->brightness);
	if (ret)
		return ret;
	ret = m5mols_read_rational(sd, EXIF_INFO_EBV_NU, EXIF_INFO_EBV_DE,
				   &exif->exposure_bias);
	if (ret)
		return ret;

	ret = m5mols_read_u16(sd, EXIF_INFO_ISO, &exif->iso_speed);
	if (!ret)
		ret = m5mols_read_u16(sd, EXIF_INFO_FLASH, &exif->flash);
	if (!ret)
		ret = m5mols_read_u16(sd, EXIF_INFO_SDR, &exif->sdr);
	if (!ret)
		ret = m5mols_read_u16(sd, EXIF_INFO_QVAL, &exif->qval);
	if (ret)
		return ret;

	if (!ret)
		ret = m5mols_read_u32(sd, CAPC_IMAGE_SIZE, &info->cap.main);
	if (!ret)
		ret = m5mols_read_u32(sd, CAPC_THUMB_SIZE, &info->cap.thumb);
	if (!ret)
		info->cap.total = info->cap.main + info->cap.thumb;

	return ret;
}

int m5mols_start_capture(struct m5mols_info *info)
{
	unsigned int framesize = info->cap.buf_size - M5MOLS_JPEG_TAGS_SIZE;
	struct v4l2_subdev *sd = &info->sd;
	int ret;

	/*
	 * Synchronize the controls, set the capture frame resolution and color
	 * format. The frame capture is initiated during switching from Monitor
	 * to Capture mode.
	 */
	ret = m5mols_set_mode(info, REG_MONITOR);
	if (!ret)
		ret = m5mols_restore_controls(info);
	if (!ret)
		ret = m5mols_write(sd, CAPP_YUVOUT_MAIN, REG_JPEG);
	if (!ret)
		ret = m5mols_write(sd, CAPP_MAIN_IMAGE_SIZE, info->resolution);
	if (!ret)
		ret = m5mols_write(sd, CAPP_JPEG_SIZE_MAX, framesize);
	if (!ret)
		ret = m5mols_set_mode(info, REG_CAPTURE);
	if (!ret)
		/* Wait until a frame is captured to ISP internal memory */
		ret = m5mols_wait_interrupt(sd, REG_INT_CAPTURE, 2000);
	if (ret)
		return ret;

	/*
	 * Initiate the captured data transfer to a MIPI-CSI receiver.
	 */
	ret = m5mols_write(sd, CAPC_SEL_FRAME, 1);
	if (!ret)
		ret = m5mols_write(sd, CAPC_START, REG_CAP_START_MAIN);
	if (!ret) {
		bool captured = false;
		unsigned int size;

		/* Wait for the capture completion interrupt */
		ret = m5mols_wait_interrupt(sd, REG_INT_CAPTURE, 2000);
		if (!ret) {
			captured = true;
			ret = m5mols_capture_info(info);
		}
		size = captured ? info->cap.main : 0;
		v4l2_dbg(1, m5mols_debug, sd, "%s: size: %d, thumb.: %d B\n",
			 __func__, size, info->cap.thumb);

		v4l2_subdev_notify(sd, S5P_FIMC_TX_END_NOTIFY, &size);
	}

	return ret;
}