m5mols_capture.c revision cb7a01ac324bf2ee2c666f37ac867e4135f9785a
1 2/* 3 * The Capture code for Fujitsu M-5MOLS ISP 4 * 5 * Copyright (C) 2011 Samsung Electronics Co., Ltd. 6 * Author: HeungJun Kim <riverful.kim@samsung.com> 7 * 8 * Copyright (C) 2009 Samsung Electronics Co., Ltd. 9 * Author: Dongsoo Nathaniel Kim <dongsoo45.kim@samsung.com> 10 * 11 * This program is free software; you can redistribute it and/or modify 12 * it under the terms of the GNU General Public License as published by 13 * the Free Software Foundation; either version 2 of the License, or 14 * (at your option) any later version. 15 */ 16 17#include <linux/i2c.h> 18#include <linux/slab.h> 19#include <linux/irq.h> 20#include <linux/interrupt.h> 21#include <linux/delay.h> 22#include <linux/gpio.h> 23#include <linux/regulator/consumer.h> 24#include <linux/videodev2.h> 25#include <media/v4l2-ctrls.h> 26#include <media/v4l2-device.h> 27#include <media/v4l2-subdev.h> 28#include <media/m5mols.h> 29#include <media/s5p_fimc.h> 30 31#include "m5mols.h" 32#include "m5mols_reg.h" 33 34/** 35 * m5mols_read_rational - I2C read of a rational number 36 * 37 * Read numerator and denominator from registers @addr_num and @addr_den 38 * respectively and return the division result in @val. 39 */ 40static 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 * 57 * For now it gathers only EXIF information and file size. 58 */ 59static int m5mols_capture_info(struct m5mols_info *info) 60{ 61 struct m5mols_exif *exif = &info->cap.exif; 62 struct v4l2_subdev *sd = &info->sd; 63 int ret; 64 65 ret = m5mols_read_rational(sd, EXIF_INFO_EXPTIME_NU, 66 EXIF_INFO_EXPTIME_DE, &exif->exposure_time); 67 if (ret) 68 return ret; 69 ret = m5mols_read_rational(sd, EXIF_INFO_TV_NU, EXIF_INFO_TV_DE, 70 &exif->shutter_speed); 71 if (ret) 72 return ret; 73 ret = m5mols_read_rational(sd, EXIF_INFO_AV_NU, EXIF_INFO_AV_DE, 74 &exif->aperture); 75 if (ret) 76 return ret; 77 ret = m5mols_read_rational(sd, EXIF_INFO_BV_NU, EXIF_INFO_BV_DE, 78 &exif->brightness); 79 if (ret) 80 return ret; 81 ret = m5mols_read_rational(sd, EXIF_INFO_EBV_NU, EXIF_INFO_EBV_DE, 82 &exif->exposure_bias); 83 if (ret) 84 return ret; 85 86 ret = m5mols_read_u16(sd, EXIF_INFO_ISO, &exif->iso_speed); 87 if (!ret) 88 ret = m5mols_read_u16(sd, EXIF_INFO_FLASH, &exif->flash); 89 if (!ret) 90 ret = m5mols_read_u16(sd, EXIF_INFO_SDR, &exif->sdr); 91 if (!ret) 92 ret = m5mols_read_u16(sd, EXIF_INFO_QVAL, &exif->qval); 93 if (ret) 94 return ret; 95 96 if (!ret) 97 ret = m5mols_read_u32(sd, CAPC_IMAGE_SIZE, &info->cap.main); 98 if (!ret) 99 ret = m5mols_read_u32(sd, CAPC_THUMB_SIZE, &info->cap.thumb); 100 if (!ret) 101 info->cap.total = info->cap.main + info->cap.thumb; 102 103 return ret; 104} 105 106int m5mols_start_capture(struct m5mols_info *info) 107{ 108 struct v4l2_subdev *sd = &info->sd; 109 int ret; 110 111 /* 112 * Synchronize the controls, set the capture frame resolution and color 113 * format. The frame capture is initiated during switching from Monitor 114 * to Capture mode. 115 */ 116 ret = m5mols_set_mode(info, REG_MONITOR); 117 if (!ret) 118 ret = m5mols_restore_controls(info); 119 if (!ret) 120 ret = m5mols_write(sd, CAPP_YUVOUT_MAIN, REG_JPEG); 121 if (!ret) 122 ret = m5mols_write(sd, CAPP_MAIN_IMAGE_SIZE, info->resolution); 123 if (!ret) 124 ret = m5mols_set_mode(info, REG_CAPTURE); 125 if (!ret) 126 /* Wait until a frame is captured to ISP internal memory */ 127 ret = m5mols_wait_interrupt(sd, REG_INT_CAPTURE, 2000); 128 if (ret) 129 return ret; 130 131 /* 132 * Initiate the captured data transfer to a MIPI-CSI receiver. 133 */ 134 ret = m5mols_write(sd, CAPC_SEL_FRAME, 1); 135 if (!ret) 136 ret = m5mols_write(sd, CAPC_START, REG_CAP_START_MAIN); 137 if (!ret) { 138 bool captured = false; 139 unsigned int size; 140 141 /* Wait for the capture completion interrupt */ 142 ret = m5mols_wait_interrupt(sd, REG_INT_CAPTURE, 2000); 143 if (!ret) { 144 captured = true; 145 ret = m5mols_capture_info(info); 146 } 147 size = captured ? info->cap.main : 0; 148 v4l2_dbg(1, m5mols_debug, sd, "%s: size: %d, thumb.: %d B\n", 149 __func__, size, info->cap.thumb); 150 151 v4l2_subdev_notify(sd, S5P_FIMC_TX_END_NOTIFY, &size); 152 } 153 154 return ret; 155} 156