drivers/media/video/m5mols/m5mols_capture.c

   1 /*
   2  * The Capture code for Fujitsu M-5MOLS ISP
   3  *
   4  * Copyright (C) 2011 Samsung Electronics Co., Ltd.
   5  * Author: HeungJun Kim <riverful.kim@samsung.com>
   6  *
   7  * Copyright (C) 2009 Samsung Electronics Co., Ltd.
   8  * Author: Dongsoo Nathaniel Kim <dongsoo45.kim@samsung.com>
   9  *
  10  * This program is free software; you can redistribute it and/or modify
  11  * it under the terms of the GNU General Public License as published by
  12  * the Free Software Foundation; either version 2 of the License, or
  13  * (at your option) any later version.
  14  */
  15
  16 #include <linux/i2c.h>
  17 #include <linux/slab.h>
  18 #include <linux/irq.h>
  19 #include <linux/interrupt.h>
  20 #include <linux/delay.h>
  21 #include <linux/gpio.h>
  22 #include <linux/regulator/consumer.h>
  23 #include <linux/videodev2.h>
  24 #include <media/v4l2-ctrls.h>
  25 #include <media/v4l2-device.h>
  26 #include <media/v4l2-subdev.h>
  27 #include <media/m5mols.h>
  28
  29 #include "m5mols.h"
  30 #include "m5mols_reg.h"
  31
  32 static int m5mols_capture_error_handler(struct m5mols_info *info,
  33                                         int timeout)
  34 {
  35         int ret;
  36
  37         /* Disable all interrupts and clear relevant interrupt staus bits */
  38         ret = m5mols_write(&info->sd, SYSTEM_INT_ENABLE,
  39                            info->interrupt & ~(REG_INT_CAPTURE));
  40         if (ret)
  41                 return ret;
  42
  43         if (timeout == 0)
  44                 return -ETIMEDOUT;
  45
  46         return 0;
  47 }
  48 /**
  49  * m5mols_read_rational - I2C read of a rational number
  50  *
  51  * Read numerator and denominator from registers @addr_num and @addr_den
  52  * respectively and return the division result in @val.
  53  */
  54 static int m5mols_read_rational(struct v4l2_subdev *sd, u32 addr_num,
  55                                 u32 addr_den, u32 *val)
  56 {
  57         u32 num, den;
  58
  59         int ret = m5mols_read_u32(sd, addr_num, &num);
  60         if (!ret)
  61                 ret = m5mols_read_u32(sd, addr_den, &den);
  62         if (ret)
  63                 return ret;
  64         *val = den == 0 ? 0 : num / den;
  65         return ret;
  66 }
  67
  68 /**
  69  * m5mols_capture_info - Gather captured image information
  70  *
  71  * For now it gathers only EXIF information and file size.
  72  */
  73 static int m5mols_capture_info(struct m5mols_info *info)
  74 {
  75         struct m5mols_exif *exif = &info->cap.exif;
  76         struct v4l2_subdev *sd = &info->sd;
  77         int ret;
  78
  79         ret = m5mols_read_rational(sd, EXIF_INFO_EXPTIME_NU,
  80                                    EXIF_INFO_EXPTIME_DE, &exif->exposure_time);
  81         if (ret)
  82                 return ret;
  83         ret = m5mols_read_rational(sd, EXIF_INFO_TV_NU, EXIF_INFO_TV_DE,
  84                                    &exif->shutter_speed);
  85         if (ret)
  86                 return ret;
  87         ret = m5mols_read_rational(sd, EXIF_INFO_AV_NU, EXIF_INFO_AV_DE,
  88                                    &exif->aperture);
  89         if (ret)
  90                 return ret;
  91         ret = m5mols_read_rational(sd, EXIF_INFO_BV_NU, EXIF_INFO_BV_DE,
  92                                    &exif->brightness);
  93         if (ret)
  94                 return ret;
  95         ret = m5mols_read_rational(sd, EXIF_INFO_EBV_NU, EXIF_INFO_EBV_DE,
  96                                    &exif->exposure_bias);
  97         if (ret)
  98                 return ret;
  99
 100         ret = m5mols_read_u16(sd, EXIF_INFO_ISO, &exif->iso_speed);
 101         if (!ret)
 102                 ret = m5mols_read_u16(sd, EXIF_INFO_FLASH, &exif->flash);
 103         if (!ret)
 104                 ret = m5mols_read_u16(sd, EXIF_INFO_SDR, &exif->sdr);
 105         if (!ret)
 106                 ret = m5mols_read_u16(sd, EXIF_INFO_QVAL, &exif->qval);
 107         if (ret)
 108                 return ret;
 109
 110         if (!ret)
 111                 ret = m5mols_read_u32(sd, CAPC_IMAGE_SIZE, &info->cap.main);
 112         if (!ret)
 113                 ret = m5mols_read_u32(sd, CAPC_THUMB_SIZE, &info->cap.thumb);
 114         if (!ret)
 115                 info->cap.total = info->cap.main + info->cap.thumb;
 116
 117         return ret;
 118 }
 119
 120 int m5mols_start_capture(struct m5mols_info *info)
 121 {
 122         struct v4l2_subdev *sd = &info->sd;
 123         u8 resolution = info->resolution;
 124         int timeout;
 125         int ret;
 126
 127         /*
 128          * Preparing capture. Setting control & interrupt before entering
 129          * capture mode
 130          *
 131          * 1) change to MONITOR mode for operating control & interrupt
 132          * 2) set controls (considering v4l2_control value & lock 3A)
 133          * 3) set interrupt
 134          * 4) change to CAPTURE mode
 135          */
 136         ret = m5mols_mode(info, REG_MONITOR);
 137         if (!ret)
 138                 ret = m5mols_sync_controls(info);
 139         if (!ret)
 140                 ret = m5mols_lock_3a(info, true);
 141         if (!ret)
 142                 ret = m5mols_enable_interrupt(sd, REG_INT_CAPTURE);
 143         if (!ret)
 144                 ret = m5mols_mode(info, REG_CAPTURE);
 145         if (!ret) {
 146                 /* Wait for capture interrupt, after changing capture mode */
 147                 timeout = wait_event_interruptible_timeout(info->irq_waitq,
 148                                            test_bit(ST_CAPT_IRQ, &info->flags),
 149                                            msecs_to_jiffies(2000));
 150                 if (test_and_clear_bit(ST_CAPT_IRQ, &info->flags))
 151                         ret = m5mols_capture_error_handler(info, timeout);
 152         }
 153         if (!ret)
 154                 ret = m5mols_lock_3a(info, false);
 155         if (ret)
 156                 return ret;
 157         /*
 158          * Starting capture. Setting capture frame count and resolution and
 159          * the format(available format: JPEG, Bayer RAW, YUV).
 160          *
 161          * 1) select single or multi(enable to 25), format, size
 162          * 2) set interrupt
 163          * 3) start capture(for main image, now)
 164          * 4) get information
 165          * 5) notify file size to v4l2 device(e.g, to s5p-fimc v4l2 device)
 166          */
 167         ret = m5mols_write(sd, CAPC_SEL_FRAME, 1);
 168         if (!ret)
 169                 ret = m5mols_write(sd, CAPP_YUVOUT_MAIN, REG_JPEG);
 170         if (!ret)
 171                 ret = m5mols_write(sd, CAPP_MAIN_IMAGE_SIZE, resolution);
 172         if (!ret)
 173                 ret = m5mols_enable_interrupt(sd, REG_INT_CAPTURE);
 174         if (!ret)
 175                 ret = m5mols_write(sd, CAPC_START, REG_CAP_START_MAIN);
 176         if (!ret) {
 177                 /* Wait for the capture completion interrupt */
 178                 timeout = wait_event_interruptible_timeout(info->irq_waitq,
 179                                            test_bit(ST_CAPT_IRQ, &info->flags),
 180                                            msecs_to_jiffies(2000));
 181                 if (test_and_clear_bit(ST_CAPT_IRQ, &info->flags)) {
 182                         ret = m5mols_capture_info(info);
 183                         if (!ret)
 184                                 v4l2_subdev_notify(sd, 0, &info->cap.total);
 185                 }
 186         }
 187
 188         return m5mols_capture_error_handler(info, timeout);
 189 }