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/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  * @sd: sub-device, as pointed by struct v4l2_subdev
  37  * @addr_num: numerator register
  38  * @addr_den: denominator register
  39  * @val: place to store the division result
  40  *
  41  * Read numerator and denominator from registers @addr_num and @addr_den
  42  * respectively and return the division result in @val.
  43  */
  44 static int m5mols_read_rational(struct v4l2_subdev *sd, u32 addr_num,
  45                                 u32 addr_den, u32 *val)
  46 {
  47         u32 num, den;
  48
  49         int ret = m5mols_read_u32(sd, addr_num, &num);
  50         if (!ret)
  51                 ret = m5mols_read_u32(sd, addr_den, &den);
  52         if (ret)
  53                 return ret;
  54         *val = den == 0 ? 0 : num / den;
  55         return ret;
  56 }
  57
  58 /**
  59  * m5mols_capture_info - Gather captured image information
  60  * @info: M-5MOLS driver data structure
  61  *
  62  * For now it gathers only EXIF information and file size.
  63  */
  64 static int m5mols_capture_info(struct m5mols_info *info)
  65 {
  66         struct m5mols_exif *exif = &info->cap.exif;
  67         struct v4l2_subdev *sd = &info->sd;
  68         int ret;
  69
  70         ret = m5mols_read_rational(sd, EXIF_INFO_EXPTIME_NU,
  71                                    EXIF_INFO_EXPTIME_DE, &exif->exposure_time);
  72         if (ret)
  73                 return ret;
  74         ret = m5mols_read_rational(sd, EXIF_INFO_TV_NU, EXIF_INFO_TV_DE,
  75                                    &exif->shutter_speed);
  76         if (ret)
  77                 return ret;
  78         ret = m5mols_read_rational(sd, EXIF_INFO_AV_NU, EXIF_INFO_AV_DE,
  79                                    &exif->aperture);
  80         if (ret)
  81                 return ret;
  82         ret = m5mols_read_rational(sd, EXIF_INFO_BV_NU, EXIF_INFO_BV_DE,
  83                                    &exif->brightness);
  84         if (ret)
  85                 return ret;
  86         ret = m5mols_read_rational(sd, EXIF_INFO_EBV_NU, EXIF_INFO_EBV_DE,
  87                                    &exif->exposure_bias);
  88         if (ret)
  89                 return ret;
  90
  91         ret = m5mols_read_u16(sd, EXIF_INFO_ISO, &exif->iso_speed);
  92         if (!ret)
  93                 ret = m5mols_read_u16(sd, EXIF_INFO_FLASH, &exif->flash);
  94         if (!ret)
  95                 ret = m5mols_read_u16(sd, EXIF_INFO_SDR, &exif->sdr);
  96         if (!ret)
  97                 ret = m5mols_read_u16(sd, EXIF_INFO_QVAL, &exif->qval);
  98         if (ret)
  99                 return ret;
 100
 101         if (!ret)
 102                 ret = m5mols_read_u32(sd, CAPC_IMAGE_SIZE, &info->cap.main);
 103         if (!ret)
 104                 ret = m5mols_read_u32(sd, CAPC_THUMB_SIZE, &info->cap.thumb);
 105         if (!ret)
 106                 info->cap.total = info->cap.main + info->cap.thumb;
 107
 108         return ret;
 109 }
 110
 111 int m5mols_start_capture(struct m5mols_info *info)
 112 {
 113         unsigned int framesize = info->cap.buf_size - M5MOLS_JPEG_TAGS_SIZE;
 114         struct v4l2_subdev *sd = &info->sd;
 115         int ret;
 116
 117         /*
 118          * Synchronize the controls, set the capture frame resolution and color
 119          * format. The frame capture is initiated during switching from Monitor
 120          * to Capture mode.
 121          */
 122         ret = m5mols_set_mode(info, REG_MONITOR);
 123         if (!ret)
 124                 ret = m5mols_restore_controls(info);
 125         if (!ret)
 126                 ret = m5mols_write(sd, CAPP_YUVOUT_MAIN, REG_JPEG);
 127         if (!ret)
 128                 ret = m5mols_write(sd, CAPP_MAIN_IMAGE_SIZE, info->resolution);
 129         if (!ret)
 130                 ret = m5mols_write(sd, CAPP_JPEG_SIZE_MAX, framesize);
 131         if (!ret)
 132                 ret = m5mols_set_mode(info, REG_CAPTURE);
 133         if (!ret)
 134                 /* Wait until a frame is captured to ISP internal memory */
 135                 ret = m5mols_wait_interrupt(sd, REG_INT_CAPTURE, 2000);
 136         if (ret)
 137                 return ret;
 138
 139         /*
 140          * Initiate the captured data transfer to a MIPI-CSI receiver.
 141          */
 142         ret = m5mols_write(sd, CAPC_SEL_FRAME, 1);
 143         if (!ret)
 144                 ret = m5mols_write(sd, CAPC_START, REG_CAP_START_MAIN);
 145         if (!ret) {
 146                 bool captured = false;
 147                 unsigned int size;
 148
 149                 /* Wait for the capture completion interrupt */
 150                 ret = m5mols_wait_interrupt(sd, REG_INT_CAPTURE, 2000);
 151                 if (!ret) {
 152                         captured = true;
 153                         ret = m5mols_capture_info(info);
 154                 }
 155                 size = captured ? info->cap.main : 0;
 156                 v4l2_dbg(1, m5mols_debug, sd, "%s: size: %d, thumb.: %d B\n",
 157                          __func__, size, info->cap.thumb);
 158
 159                 v4l2_subdev_notify(sd, S5P_FIMC_TX_END_NOTIFY, &size);
 160         }
 161
 162         return ret;
 163 }