drivers/media/i2c/m5mols/m5mols_capture.c

   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/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  */
  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  *
  57  * For now it gathers only EXIF information and file size.
  58  */
  59 static 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
 106 int 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 }