LXR linux/drivers/media/i2c/m5mols/m5mols

   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/i2c/m5mols.h>
  29#include <media/drv-intf/exynos-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        unsigned int framesize = info->cap.buf_size - M5MOLS_JPEG_TAGS_SIZE;
 109        struct v4l2_subdev *sd = &info->sd;
 110        int ret;
 111
 112        /*
 113         * Synchronize the controls, set the capture frame resolution and color
 114         * format. The frame capture is initiated during switching from Monitor
 115         * to Capture mode.
 116         */
 117        ret = m5mols_set_mode(info, REG_MONITOR);
 118        if (!ret)
 119                ret = m5mols_restore_controls(info);
 120        if (!ret)
 121                ret = m5mols_write(sd, CAPP_YUVOUT_MAIN, REG_JPEG);
 122        if (!ret)
 123                ret = m5mols_write(sd, CAPP_MAIN_IMAGE_SIZE, info->resolution);
 124        if (!ret)
 125                ret = m5mols_write(sd, CAPP_JPEG_SIZE_MAX, framesize);
 126        if (!ret)
 127                ret = m5mols_set_mode(info, REG_CAPTURE);
 128        if (!ret)
 129                /* Wait until a frame is captured to ISP internal memory */
 130                ret = m5mols_wait_interrupt(sd, REG_INT_CAPTURE, 2000);
 131        if (ret)
 132                return ret;
 133
 134        /*
 135         * Initiate the captured data transfer to a MIPI-CSI receiver.
 136         */
 137        ret = m5mols_write(sd, CAPC_SEL_FRAME, 1);
 138        if (!ret)
 139                ret = m5mols_write(sd, CAPC_START, REG_CAP_START_MAIN);
 140        if (!ret) {
 141                bool captured = false;
 142                unsigned int size;
 143
 144                /* Wait for the capture completion interrupt */
 145                ret = m5mols_wait_interrupt(sd, REG_INT_CAPTURE, 2000);
 146                if (!ret) {
 147                        captured = true;
 148                        ret = m5mols_capture_info(info);
 149                }
 150                size = captured ? info->cap.main : 0;
 151                v4l2_dbg(1, m5mols_debug, sd, "%s: size: %d, thumb.: %d B\n",
 152                         __func__, size, info->cap.thumb);
 153
 154                v4l2_subdev_notify(sd, S5P_FIMC_TX_END_NOTIFY, &size);
 155        }
 156
 157        return ret;
 158}
 159