1 // SPDX-License-Identifier: GPL-2.0-or-later
2
3 /*
4 * The Capture code for Fujitsu M-5MOLS ISP
5 *
6 * Copyright (C) 2011 Samsung Electronics Co., Ltd.
7 * Author: HeungJun Kim <riverful.kim@samsung.com>
8 *
9 * Copyright (C) 2009 Samsung Electronics Co., Ltd.
10 * Author: Dongsoo Nathaniel Kim <dongsoo45.kim@samsung.com>
11 */
12
13 #include <linux/i2c.h>
14 #include <linux/slab.h>
15 #include <linux/irq.h>
16 #include <linux/interrupt.h>
17 #include <linux/delay.h>
18 #include <linux/gpio.h>
19 #include <linux/regulator/consumer.h>
20 #include <linux/videodev2.h>
21 #include <media/v4l2-ctrls.h>
22 #include <media/v4l2-device.h>
23 #include <media/v4l2-subdev.h>
24 #include <media/i2c/m5mols.h>
25 #include <media/drv-intf/exynos-fimc.h>
26
27 #include "m5mols.h"
28 #include "m5mols_reg.h"
29
30 /**
31 * m5mols_read_rational - I2C read of a rational number
32 * @sd: sub-device, as pointed by struct v4l2_subdev
33 * @addr_num: numerator register
34 * @addr_den: denominator register
35 * @val: place to store the division result
36 *
37 * Read numerator and denominator from registers @addr_num and @addr_den
38 * respectively and return the division result in @val.
39 */
m5mols_read_rational(struct v4l2_subdev * sd,u32 addr_num,u32 addr_den,u32 * val)40 static int m5mols_read_rational(struct v4l2_subdev *sd, u32 addr_num,
41 u32 addr_den, u32 *val)
42 {
43 u32 num, den;
44
45 int ret = m5mols_read_u32(sd, addr_num, &num);
46 if (!ret)
47 ret = m5mols_read_u32(sd, addr_den, &den);
48 if (ret)
49 return ret;
50 *val = den == 0 ? 0 : num / den;
51 return ret;
52 }
53
54 /**
55 * m5mols_capture_info - Gather captured image information
56 * @info: M-5MOLS driver data structure
57 *
58 * For now it gathers only EXIF information and file size.
59 */
m5mols_capture_info(struct m5mols_info * info)60 static int m5mols_capture_info(struct m5mols_info *info)
61 {
62 struct m5mols_exif *exif = &info->cap.exif;
63 struct v4l2_subdev *sd = &info->sd;
64 int ret;
65
66 ret = m5mols_read_rational(sd, EXIF_INFO_EXPTIME_NU,
67 EXIF_INFO_EXPTIME_DE, &exif->exposure_time);
68 if (ret)
69 return ret;
70 ret = m5mols_read_rational(sd, EXIF_INFO_TV_NU, EXIF_INFO_TV_DE,
71 &exif->shutter_speed);
72 if (ret)
73 return ret;
74 ret = m5mols_read_rational(sd, EXIF_INFO_AV_NU, EXIF_INFO_AV_DE,
75 &exif->aperture);
76 if (ret)
77 return ret;
78 ret = m5mols_read_rational(sd, EXIF_INFO_BV_NU, EXIF_INFO_BV_DE,
79 &exif->brightness);
80 if (ret)
81 return ret;
82 ret = m5mols_read_rational(sd, EXIF_INFO_EBV_NU, EXIF_INFO_EBV_DE,
83 &exif->exposure_bias);
84 if (ret)
85 return ret;
86
87 ret = m5mols_read_u16(sd, EXIF_INFO_ISO, &exif->iso_speed);
88 if (!ret)
89 ret = m5mols_read_u16(sd, EXIF_INFO_FLASH, &exif->flash);
90 if (!ret)
91 ret = m5mols_read_u16(sd, EXIF_INFO_SDR, &exif->sdr);
92 if (!ret)
93 ret = m5mols_read_u16(sd, EXIF_INFO_QVAL, &exif->qval);
94 if (ret)
95 return ret;
96
97 if (!ret)
98 ret = m5mols_read_u32(sd, CAPC_IMAGE_SIZE, &info->cap.main);
99 if (!ret)
100 ret = m5mols_read_u32(sd, CAPC_THUMB_SIZE, &info->cap.thumb);
101 if (!ret)
102 info->cap.total = info->cap.main + info->cap.thumb;
103
104 return ret;
105 }
106
m5mols_start_capture(struct m5mols_info * info)107 int m5mols_start_capture(struct m5mols_info *info)
108 {
109 unsigned int framesize = info->cap.buf_size - M5MOLS_JPEG_TAGS_SIZE;
110 struct v4l2_subdev *sd = &info->sd;
111 int ret;
112
113 /*
114 * Synchronize the controls, set the capture frame resolution and color
115 * format. The frame capture is initiated during switching from Monitor
116 * to Capture mode.
117 */
118 ret = m5mols_set_mode(info, REG_MONITOR);
119 if (!ret)
120 ret = m5mols_restore_controls(info);
121 if (!ret)
122 ret = m5mols_write(sd, CAPP_YUVOUT_MAIN, REG_JPEG);
123 if (!ret)
124 ret = m5mols_write(sd, CAPP_MAIN_IMAGE_SIZE, info->resolution);
125 if (!ret)
126 ret = m5mols_write(sd, CAPP_JPEG_SIZE_MAX, framesize);
127 if (!ret)
128 ret = m5mols_set_mode(info, REG_CAPTURE);
129 if (!ret)
130 /* Wait until a frame is captured to ISP internal memory */
131 ret = m5mols_wait_interrupt(sd, REG_INT_CAPTURE, 2000);
132 if (ret)
133 return ret;
134
135 /*
136 * Initiate the captured data transfer to a MIPI-CSI receiver.
137 */
138 ret = m5mols_write(sd, CAPC_SEL_FRAME, 1);
139 if (!ret)
140 ret = m5mols_write(sd, CAPC_START, REG_CAP_START_MAIN);
141 if (!ret) {
142 bool captured = false;
143 unsigned int size;
144
145 /* Wait for the capture completion interrupt */
146 ret = m5mols_wait_interrupt(sd, REG_INT_CAPTURE, 2000);
147 if (!ret) {
148 captured = true;
149 ret = m5mols_capture_info(info);
150 }
151 size = captured ? info->cap.main : 0;
152 v4l2_dbg(1, m5mols_debug, sd, "%s: size: %d, thumb.: %d B\n",
153 __func__, size, info->cap.thumb);
154
155 v4l2_subdev_notify(sd, S5P_FIMC_TX_END_NOTIFY, &size);
156 }
157
158 return ret;
159 }
160