Merge branch 'modsplit-Oct31_2011' of git://git.kernel.org/pub/scm/linux/kernel/git...

[mirror_ubuntu-artful-kernel.git] / drivers / media / video / m5mols / m5mols_core.c

/*
 * Driver for M-5MOLS 8M Pixel camera sensor with ISP
 *
 * Copyright (C) 2011 Samsung Electronics Co., Ltd.
 * Author: HeungJun Kim <riverful.kim@samsung.com>
 *
 * Copyright (C) 2009 Samsung Electronics Co., Ltd.
 * Author: Dongsoo Nathaniel Kim <dongsoo45.kim@samsung.com>
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 2 of the License, or
 * (at your option) any later version.
 */

#include <linux/i2c.h>
#include <linux/slab.h>
#include <linux/irq.h>
#include <linux/interrupt.h>
#include <linux/delay.h>
#include <linux/gpio.h>
#include <linux/regulator/consumer.h>
#include <linux/videodev2.h>
#include <linux/module.h>
#include <media/v4l2-ctrls.h>
#include <media/v4l2-device.h>
#include <media/v4l2-subdev.h>
#include <media/m5mols.h>

#include "m5mols.h"
#include "m5mols_reg.h"

int m5mols_debug;
module_param(m5mols_debug, int, 0644);

#define MODULE_NAME             "M5MOLS"
#define M5MOLS_I2C_CHECK_RETRY  500

/* The regulator consumer names for external voltage regulators */
static struct regulator_bulk_data supplies[] = {
        {
                .supply = "core",       /* ARM core power, 1.2V */
        }, {
                .supply = "dig_18",     /* digital power 1, 1.8V */
        }, {
                .supply = "d_sensor",   /* sensor power 1, 1.8V */
        }, {
                .supply = "dig_28",     /* digital power 2, 2.8V */
        }, {
                .supply = "a_sensor",   /* analog power */
        }, {
                .supply = "dig_12",     /* digital power 3, 1.2V */
        },
};

static struct v4l2_mbus_framefmt m5mols_default_ffmt[M5MOLS_RESTYPE_MAX] = {
        [M5MOLS_RESTYPE_MONITOR] = {
                .width          = 1920,
                .height         = 1080,
                .code           = V4L2_MBUS_FMT_VYUY8_2X8,
                .field          = V4L2_FIELD_NONE,
                .colorspace     = V4L2_COLORSPACE_JPEG,
        },
        [M5MOLS_RESTYPE_CAPTURE] = {
                .width          = 1920,
                .height         = 1080,
                .code           = V4L2_MBUS_FMT_JPEG_1X8,
                .field          = V4L2_FIELD_NONE,
                .colorspace     = V4L2_COLORSPACE_JPEG,
        },
};
#define SIZE_DEFAULT_FFMT       ARRAY_SIZE(m5mols_default_ffmt)

static const struct m5mols_resolution m5mols_reg_res[] = {
        { 0x01, M5MOLS_RESTYPE_MONITOR, 128, 96 },      /* SUB-QCIF */
        { 0x03, M5MOLS_RESTYPE_MONITOR, 160, 120 },     /* QQVGA */
        { 0x05, M5MOLS_RESTYPE_MONITOR, 176, 144 },     /* QCIF */
        { 0x06, M5MOLS_RESTYPE_MONITOR, 176, 176 },
        { 0x08, M5MOLS_RESTYPE_MONITOR, 240, 320 },     /* QVGA */
        { 0x09, M5MOLS_RESTYPE_MONITOR, 320, 240 },     /* QVGA */
        { 0x0c, M5MOLS_RESTYPE_MONITOR, 240, 400 },     /* WQVGA */
        { 0x0d, M5MOLS_RESTYPE_MONITOR, 400, 240 },     /* WQVGA */
        { 0x0e, M5MOLS_RESTYPE_MONITOR, 352, 288 },     /* CIF */
        { 0x13, M5MOLS_RESTYPE_MONITOR, 480, 360 },
        { 0x15, M5MOLS_RESTYPE_MONITOR, 640, 360 },     /* qHD */
        { 0x17, M5MOLS_RESTYPE_MONITOR, 640, 480 },     /* VGA */
        { 0x18, M5MOLS_RESTYPE_MONITOR, 720, 480 },
        { 0x1a, M5MOLS_RESTYPE_MONITOR, 800, 480 },     /* WVGA */
        { 0x1f, M5MOLS_RESTYPE_MONITOR, 800, 600 },     /* SVGA */
        { 0x21, M5MOLS_RESTYPE_MONITOR, 1280, 720 },    /* HD */
        { 0x25, M5MOLS_RESTYPE_MONITOR, 1920, 1080 },   /* 1080p */
        { 0x29, M5MOLS_RESTYPE_MONITOR, 3264, 2448 },   /* 2.63fps 8M */
        { 0x39, M5MOLS_RESTYPE_MONITOR, 800, 602 },     /* AHS_MON debug */

        { 0x02, M5MOLS_RESTYPE_CAPTURE, 320, 240 },     /* QVGA */
        { 0x04, M5MOLS_RESTYPE_CAPTURE, 400, 240 },     /* WQVGA */
        { 0x07, M5MOLS_RESTYPE_CAPTURE, 480, 360 },
        { 0x08, M5MOLS_RESTYPE_CAPTURE, 640, 360 },     /* qHD */
        { 0x09, M5MOLS_RESTYPE_CAPTURE, 640, 480 },     /* VGA */
        { 0x0a, M5MOLS_RESTYPE_CAPTURE, 800, 480 },     /* WVGA */
        { 0x10, M5MOLS_RESTYPE_CAPTURE, 1280, 720 },    /* HD */
        { 0x14, M5MOLS_RESTYPE_CAPTURE, 1280, 960 },    /* 1M */
        { 0x17, M5MOLS_RESTYPE_CAPTURE, 1600, 1200 },   /* 2M */
        { 0x19, M5MOLS_RESTYPE_CAPTURE, 1920, 1080 },   /* Full-HD */
        { 0x1a, M5MOLS_RESTYPE_CAPTURE, 2048, 1152 },   /* 3Mega */
        { 0x1b, M5MOLS_RESTYPE_CAPTURE, 2048, 1536 },
        { 0x1c, M5MOLS_RESTYPE_CAPTURE, 2560, 1440 },   /* 4Mega */
        { 0x1d, M5MOLS_RESTYPE_CAPTURE, 2560, 1536 },
        { 0x1f, M5MOLS_RESTYPE_CAPTURE, 2560, 1920 },   /* 5Mega */
        { 0x21, M5MOLS_RESTYPE_CAPTURE, 3264, 1836 },   /* 6Mega */
        { 0x22, M5MOLS_RESTYPE_CAPTURE, 3264, 1960 },
        { 0x25, M5MOLS_RESTYPE_CAPTURE, 3264, 2448 },   /* 8Mega */
};

/**
 * m5mols_swap_byte - an byte array to integer conversion function
 * @size: size in bytes of I2C packet defined in the M-5MOLS datasheet
 *
 * Convert I2C data byte array with performing any required byte
 * reordering to assure proper values for each data type, regardless
 * of the architecture endianness.
 */
static u32 m5mols_swap_byte(u8 *data, u8 length)
{
        if (length == 1)
                return *data;
        else if (length == 2)
                return be16_to_cpu(*((u16 *)data));
        else
                return be32_to_cpu(*((u32 *)data));
}

/**
 * m5mols_read -  I2C read function
 * @reg: combination of size, category and command for the I2C packet
 * @size: desired size of I2C packet
 * @val: read value
 */
static int m5mols_read(struct v4l2_subdev *sd, u32 size, u32 reg, u32 *val)
{
        struct i2c_client *client = v4l2_get_subdevdata(sd);
        u8 rbuf[M5MOLS_I2C_MAX_SIZE + 1];
        u8 category = I2C_CATEGORY(reg);
        u8 cmd = I2C_COMMAND(reg);
        struct i2c_msg msg[2];
        u8 wbuf[5];
        int ret;

        if (!client->adapter)
                return -ENODEV;

        msg[0].addr = client->addr;
        msg[0].flags = 0;
        msg[0].len = 5;
        msg[0].buf = wbuf;
        wbuf[0] = 5;
        wbuf[1] = M5MOLS_BYTE_READ;
        wbuf[2] = category;
        wbuf[3] = cmd;
        wbuf[4] = size;

        msg[1].addr = client->addr;
        msg[1].flags = I2C_M_RD;
        msg[1].len = size + 1;
        msg[1].buf = rbuf;

        /* minimum stabilization time */
        usleep_range(200, 200);

        ret = i2c_transfer(client->adapter, msg, 2);
        if (ret < 0) {
                v4l2_err(sd, "read failed: size:%d cat:%02x cmd:%02x. %d\n",
                         size, category, cmd, ret);
                return ret;
        }

        *val = m5mols_swap_byte(&rbuf[1], size);

        return 0;
}

int m5mols_read_u8(struct v4l2_subdev *sd, u32 reg, u8 *val)
{
        u32 val_32;
        int ret;

        if (I2C_SIZE(reg) != 1) {
                v4l2_err(sd, "Wrong data size\n");
                return -EINVAL;
        }

        ret = m5mols_read(sd, I2C_SIZE(reg), reg, &val_32);
        if (ret)
                return ret;

        *val = (u8)val_32;
        return ret;
}

int m5mols_read_u16(struct v4l2_subdev *sd, u32 reg, u16 *val)
{
        u32 val_32;
        int ret;

        if (I2C_SIZE(reg) != 2) {
                v4l2_err(sd, "Wrong data size\n");
                return -EINVAL;
        }

        ret = m5mols_read(sd, I2C_SIZE(reg), reg, &val_32);
        if (ret)
                return ret;

        *val = (u16)val_32;
        return ret;
}

int m5mols_read_u32(struct v4l2_subdev *sd, u32 reg, u32 *val)
{
        if (I2C_SIZE(reg) != 4) {
                v4l2_err(sd, "Wrong data size\n");
                return -EINVAL;
        }

        return m5mols_read(sd, I2C_SIZE(reg), reg, val);
}

/**
 * m5mols_write - I2C command write function
 * @reg: combination of size, category and command for the I2C packet
 * @val: value to write
 */
int m5mols_write(struct v4l2_subdev *sd, u32 reg, u32 val)
{
        struct i2c_client *client = v4l2_get_subdevdata(sd);
        u8 wbuf[M5MOLS_I2C_MAX_SIZE + 4];
        u8 category = I2C_CATEGORY(reg);
        u8 cmd = I2C_COMMAND(reg);
        u8 size = I2C_SIZE(reg);
        u32 *buf = (u32 *)&wbuf[4];
        struct i2c_msg msg[1];
        int ret;

        if (!client->adapter)
                return -ENODEV;

        if (size != 1 && size != 2 && size != 4) {
                v4l2_err(sd, "Wrong data size\n");
                return -EINVAL;
        }

        msg->addr = client->addr;
        msg->flags = 0;
        msg->len = (u16)size + 4;
        msg->buf = wbuf;
        wbuf[0] = size + 4;
        wbuf[1] = M5MOLS_BYTE_WRITE;
        wbuf[2] = category;
        wbuf[3] = cmd;

        *buf = m5mols_swap_byte((u8 *)&val, size);

        usleep_range(200, 200);

        ret = i2c_transfer(client->adapter, msg, 1);
        if (ret < 0) {
                v4l2_err(sd, "write failed: size:%d cat:%02x cmd:%02x. %d\n",
                        size, category, cmd, ret);
                return ret;
        }

        return 0;
}

int m5mols_busy(struct v4l2_subdev *sd, u8 category, u8 cmd, u8 mask)
{
        u8 busy;
        int i;
        int ret;

        for (i = 0; i < M5MOLS_I2C_CHECK_RETRY; i++) {
                ret = m5mols_read_u8(sd, I2C_REG(category, cmd, 1), &busy);
                if (ret < 0)
                        return ret;
                if ((busy & mask) == mask)
                        return 0;
        }
        return -EBUSY;
}

/**
 * m5mols_enable_interrupt - Clear interrupt pending bits and unmask interrupts
 *
 * Before writing desired interrupt value the INT_FACTOR register should
 * be read to clear pending interrupts.
 */
int m5mols_enable_interrupt(struct v4l2_subdev *sd, u8 reg)
{
        struct m5mols_info *info = to_m5mols(sd);
        u8 mask = is_available_af(info) ? REG_INT_AF : 0;
        u8 dummy;
        int ret;

        ret = m5mols_read_u8(sd, SYSTEM_INT_FACTOR, &dummy);
        if (!ret)
                ret = m5mols_write(sd, SYSTEM_INT_ENABLE, reg & ~mask);
        return ret;
}

/**
 * m5mols_reg_mode - Write the mode and check busy status
 *
 * It always accompanies a little delay changing the M-5MOLS mode, so it is
 * needed checking current busy status to guarantee right mode.
 */
static int m5mols_reg_mode(struct v4l2_subdev *sd, u8 mode)
{
        int ret = m5mols_write(sd, SYSTEM_SYSMODE, mode);

        return ret ? ret : m5mols_busy(sd, CAT_SYSTEM, CAT0_SYSMODE, mode);
}

/**
 * m5mols_mode - manage the M-5MOLS's mode
 * @mode: the required operation mode
 *
 * The commands of M-5MOLS are grouped into specific modes. Each functionality
 * can be guaranteed only when the sensor is operating in mode which which
 * a command belongs to.
 */
int m5mols_mode(struct m5mols_info *info, u8 mode)
{
        struct v4l2_subdev *sd = &info->sd;
        int ret = -EINVAL;
        u8 reg;

        if (mode < REG_PARAMETER && mode > REG_CAPTURE)
                return ret;

        ret = m5mols_read_u8(sd, SYSTEM_SYSMODE, &reg);
        if ((!ret && reg == mode) || ret)
                return ret;

        switch (reg) {
        case REG_PARAMETER:
                ret = m5mols_reg_mode(sd, REG_MONITOR);
                if (!ret && mode == REG_MONITOR)
                        break;
                if (!ret)
                        ret = m5mols_reg_mode(sd, REG_CAPTURE);
                break;

        case REG_MONITOR:
                if (mode == REG_PARAMETER) {
                        ret = m5mols_reg_mode(sd, REG_PARAMETER);
                        break;
                }

                ret = m5mols_reg_mode(sd, REG_CAPTURE);
                break;

        case REG_CAPTURE:
                ret = m5mols_reg_mode(sd, REG_MONITOR);
                if (!ret && mode == REG_MONITOR)
                        break;
                if (!ret)
                        ret = m5mols_reg_mode(sd, REG_PARAMETER);
                break;

        default:
                v4l2_warn(sd, "Wrong mode: %d\n", mode);
        }

        if (!ret)
                info->mode = mode;

        return ret;
}

/**
 * m5mols_get_version - retrieve full revisions information of M-5MOLS
 *
 * The version information includes revisions of hardware and firmware,
 * AutoFocus alghorithm version and the version string.
 */
static int m5mols_get_version(struct v4l2_subdev *sd)
{
        struct m5mols_info *info = to_m5mols(sd);
        struct m5mols_version *ver = &info->ver;
        u8 *str = ver->str;
        int i;
        int ret;

        ret = m5mols_read_u8(sd, SYSTEM_VER_CUSTOMER, &ver->customer);
        if (!ret)
                ret = m5mols_read_u8(sd, SYSTEM_VER_PROJECT, &ver->project);
        if (!ret)
                ret = m5mols_read_u16(sd, SYSTEM_VER_FIRMWARE, &ver->fw);
        if (!ret)
                ret = m5mols_read_u16(sd, SYSTEM_VER_HARDWARE, &ver->hw);
        if (!ret)
                ret = m5mols_read_u16(sd, SYSTEM_VER_PARAMETER, &ver->param);
        if (!ret)
                ret = m5mols_read_u16(sd, SYSTEM_VER_AWB, &ver->awb);
        if (!ret)
                ret = m5mols_read_u8(sd, AF_VERSION, &ver->af);
        if (ret)
                return ret;

        for (i = 0; i < VERSION_STRING_SIZE; i++) {
                ret = m5mols_read_u8(sd, SYSTEM_VER_STRING, &str[i]);
                if (ret)
                        return ret;
        }

        ver->fw = be16_to_cpu(ver->fw);
        ver->hw = be16_to_cpu(ver->hw);
        ver->param = be16_to_cpu(ver->param);
        ver->awb = be16_to_cpu(ver->awb);

        v4l2_info(sd, "Manufacturer\t[%s]\n",
                        is_manufacturer(info, REG_SAMSUNG_ELECTRO) ?
                        "Samsung Electro-Machanics" :
                        is_manufacturer(info, REG_SAMSUNG_OPTICS) ?
                        "Samsung Fiber-Optics" :
                        is_manufacturer(info, REG_SAMSUNG_TECHWIN) ?
                        "Samsung Techwin" : "None");
        v4l2_info(sd, "Customer/Project\t[0x%02x/0x%02x]\n",
                        info->ver.customer, info->ver.project);

        if (!is_available_af(info))
                v4l2_info(sd, "No support Auto Focus on this firmware\n");

        return ret;
}

/**
 * __find_restype - Lookup M-5MOLS resolution type according to pixel code
 * @code: pixel code
 */
static enum m5mols_restype __find_restype(enum v4l2_mbus_pixelcode code)
{
        enum m5mols_restype type = M5MOLS_RESTYPE_MONITOR;

        do {
                if (code == m5mols_default_ffmt[type].code)
                        return type;
        } while (type++ != SIZE_DEFAULT_FFMT);

        return 0;
}

/**
 * __find_resolution - Lookup preset and type of M-5MOLS's resolution
 * @mf: pixel format to find/negotiate the resolution preset for
 * @type: M-5MOLS resolution type
 * @resolution: M-5MOLS resolution preset register value
 *
 * Find nearest resolution matching resolution preset and adjust mf
 * to supported values.
 */
static int __find_resolution(struct v4l2_subdev *sd,
                             struct v4l2_mbus_framefmt *mf,
                             enum m5mols_restype *type,
                             u32 *resolution)
{
        const struct m5mols_resolution *fsize = &m5mols_reg_res[0];
        const struct m5mols_resolution *match = NULL;
        enum m5mols_restype stype = __find_restype(mf->code);
        int i = ARRAY_SIZE(m5mols_reg_res);
        unsigned int min_err = ~0;

        while (i--) {
                int err;
                if (stype == fsize->type) {
                        err = abs(fsize->width - mf->width)
                                + abs(fsize->height - mf->height);

                        if (err < min_err) {
                                min_err = err;
                                match = fsize;
                        }
                }
                fsize++;
        }
        if (match) {
                mf->width  = match->width;
                mf->height = match->height;
                *resolution = match->reg;
                *type = stype;
                return 0;
        }

        return -EINVAL;
}

static struct v4l2_mbus_framefmt *__find_format(struct m5mols_info *info,
                                struct v4l2_subdev_fh *fh,
                                enum v4l2_subdev_format_whence which,
                                enum m5mols_restype type)
{
        if (which == V4L2_SUBDEV_FORMAT_TRY)
                return fh ? v4l2_subdev_get_try_format(fh, 0) : NULL;

        return &info->ffmt[type];
}

static int m5mols_get_fmt(struct v4l2_subdev *sd, struct v4l2_subdev_fh *fh,
                          struct v4l2_subdev_format *fmt)
{
        struct m5mols_info *info = to_m5mols(sd);
        struct v4l2_mbus_framefmt *format;

        if (fmt->pad != 0)
                return -EINVAL;

        format = __find_format(info, fh, fmt->which, info->res_type);
        if (!format)
                return -EINVAL;

        fmt->format = *format;
        return 0;
}

static int m5mols_set_fmt(struct v4l2_subdev *sd, struct v4l2_subdev_fh *fh,
                          struct v4l2_subdev_format *fmt)
{
        struct m5mols_info *info = to_m5mols(sd);
        struct v4l2_mbus_framefmt *format = &fmt->format;
        struct v4l2_mbus_framefmt *sfmt;
        enum m5mols_restype type;
        u32 resolution = 0;
        int ret;

        if (fmt->pad != 0)
                return -EINVAL;

        ret = __find_resolution(sd, format, &type, &resolution);
        if (ret < 0)
                return ret;

        sfmt = __find_format(info, fh, fmt->which, type);
        if (!sfmt)
                return 0;

        *sfmt           = m5mols_default_ffmt[type];
        sfmt->width     = format->width;
        sfmt->height    = format->height;

        if (fmt->which == V4L2_SUBDEV_FORMAT_ACTIVE) {
                info->resolution = resolution;
                info->code = format->code;
                info->res_type = type;
        }

        return 0;
}

static int m5mols_enum_mbus_code(struct v4l2_subdev *sd,
                                 struct v4l2_subdev_fh *fh,
                                 struct v4l2_subdev_mbus_code_enum *code)
{
        if (!code || code->index >= SIZE_DEFAULT_FFMT)
                return -EINVAL;

        code->code = m5mols_default_ffmt[code->index].code;

        return 0;
}

static struct v4l2_subdev_pad_ops m5mols_pad_ops = {
        .enum_mbus_code = m5mols_enum_mbus_code,
        .get_fmt        = m5mols_get_fmt,
        .set_fmt        = m5mols_set_fmt,
};

/**
 * m5mols_sync_controls - Apply default scene mode and the current controls
 *
 * This is used only streaming for syncing between v4l2_ctrl framework and
 * m5mols's controls. First, do the scenemode to the sensor, then call
 * v4l2_ctrl_handler_setup. It can be same between some commands and
 * the scenemode's in the default v4l2_ctrls. But, such commands of control
 * should be prior to the scenemode's one.
 */
int m5mols_sync_controls(struct m5mols_info *info)
{
        int ret = -EINVAL;

        if (!is_ctrl_synced(info)) {
                ret = m5mols_do_scenemode(info, REG_SCENE_NORMAL);
                if (ret)
                        return ret;

                v4l2_ctrl_handler_setup(&info->handle);
                info->ctrl_sync = true;
        }

        return ret;
}

/**
 * m5mols_start_monitor - Start the monitor mode
 *
 * Before applying the controls setup the resolution and frame rate
 * in PARAMETER mode, and then switch over to MONITOR mode.
 */
static int m5mols_start_monitor(struct m5mols_info *info)
{
        struct v4l2_subdev *sd = &info->sd;
        int ret;

        ret = m5mols_mode(info, REG_PARAMETER);
        if (!ret)
                ret = m5mols_write(sd, PARM_MON_SIZE, info->resolution);
        if (!ret)
                ret = m5mols_write(sd, PARM_MON_FPS, REG_FPS_30);
        if (!ret)
                ret = m5mols_mode(info, REG_MONITOR);
        if (!ret)
                ret = m5mols_sync_controls(info);

        return ret;
}

static int m5mols_s_stream(struct v4l2_subdev *sd, int enable)
{
        struct m5mols_info *info = to_m5mols(sd);

        if (enable) {
                int ret = -EINVAL;

                if (is_code(info->code, M5MOLS_RESTYPE_MONITOR))
                        ret = m5mols_start_monitor(info);
                if (is_code(info->code, M5MOLS_RESTYPE_CAPTURE))
                        ret = m5mols_start_capture(info);

                return ret;
        }

        return m5mols_mode(info, REG_PARAMETER);
}

static const struct v4l2_subdev_video_ops m5mols_video_ops = {
        .s_stream       = m5mols_s_stream,
};

static int m5mols_s_ctrl(struct v4l2_ctrl *ctrl)
{
        struct v4l2_subdev *sd = to_sd(ctrl);
        struct m5mols_info *info = to_m5mols(sd);
        int ret;

        info->mode_save = info->mode;

        ret = m5mols_mode(info, REG_PARAMETER);
        if (!ret)
                ret = m5mols_set_ctrl(ctrl);
        if (!ret)
                ret = m5mols_mode(info, info->mode_save);

        return ret;
}

static const struct v4l2_ctrl_ops m5mols_ctrl_ops = {
        .s_ctrl = m5mols_s_ctrl,
};

static int m5mols_sensor_power(struct m5mols_info *info, bool enable)
{
        struct v4l2_subdev *sd = &info->sd;
        struct i2c_client *client = v4l2_get_subdevdata(sd);
        const struct m5mols_platform_data *pdata = info->pdata;
        int ret;

        if (enable) {
                if (is_powered(info))
                        return 0;

                if (info->set_power) {
                        ret = info->set_power(&client->dev, 1);
                        if (ret)
                                return ret;
                }

                ret = regulator_bulk_enable(ARRAY_SIZE(supplies), supplies);
                if (ret) {
                        info->set_power(&client->dev, 0);
                        return ret;
                }

                gpio_set_value(pdata->gpio_reset, !pdata->reset_polarity);
                usleep_range(1000, 1000);
                info->power = true;

                return ret;
        }

        if (!is_powered(info))
                return 0;

        ret = regulator_bulk_disable(ARRAY_SIZE(supplies), supplies);
        if (ret)
                return ret;

        if (info->set_power)
                info->set_power(&client->dev, 0);

        gpio_set_value(pdata->gpio_reset, pdata->reset_polarity);
        usleep_range(1000, 1000);
        info->power = false;

        return ret;
}

/* m5mols_update_fw - optional firmware update routine */
int __attribute__ ((weak)) m5mols_update_fw(struct v4l2_subdev *sd,
                int (*set_power)(struct m5mols_info *, bool))
{
        return 0;
}

/**
 * m5mols_sensor_armboot - Booting M-5MOLS internal ARM core.
 *
 * Booting internal ARM core makes the M-5MOLS is ready for getting commands
 * with I2C. It's the first thing to be done after it powered up. It must wait
 * at least 520ms recommended by M-5MOLS datasheet, after executing arm booting.
 */
static int m5mols_sensor_armboot(struct v4l2_subdev *sd)
{
        int ret;

        ret = m5mols_write(sd, FLASH_CAM_START, REG_START_ARM_BOOT);
        if (ret < 0)
                return ret;

        msleep(520);

        ret = m5mols_get_version(sd);
        if (!ret)
                ret = m5mols_update_fw(sd, m5mols_sensor_power);
        if (ret)
                return ret;

        v4l2_dbg(1, m5mols_debug, sd, "Success ARM Booting\n");

        ret = m5mols_write(sd, PARM_INTERFACE, REG_INTERFACE_MIPI);
        if (!ret)
                ret = m5mols_enable_interrupt(sd, REG_INT_AF);

        return ret;
}

static int m5mols_init_controls(struct m5mols_info *info)
{
        struct v4l2_subdev *sd = &info->sd;
        u16 max_exposure;
        u16 step_zoom;
        int ret;

        /* Determine value's range & step of controls for various FW version */
        ret = m5mols_read_u16(sd, AE_MAX_GAIN_MON, &max_exposure);
        if (!ret)
                step_zoom = is_manufacturer(info, REG_SAMSUNG_OPTICS) ? 31 : 1;
        if (ret)
                return ret;

        v4l2_ctrl_handler_init(&info->handle, 6);
        info->autowb = v4l2_ctrl_new_std(&info->handle,
                        &m5mols_ctrl_ops, V4L2_CID_AUTO_WHITE_BALANCE,
                        0, 1, 1, 0);
        info->saturation = v4l2_ctrl_new_std(&info->handle,
                        &m5mols_ctrl_ops, V4L2_CID_SATURATION,
                        1, 5, 1, 3);
        info->zoom = v4l2_ctrl_new_std(&info->handle,
                        &m5mols_ctrl_ops, V4L2_CID_ZOOM_ABSOLUTE,
                        1, 70, step_zoom, 1);
        info->exposure = v4l2_ctrl_new_std(&info->handle,
                        &m5mols_ctrl_ops, V4L2_CID_EXPOSURE,
                        0, max_exposure, 1, (int)max_exposure/2);
        info->colorfx = v4l2_ctrl_new_std_menu(&info->handle,
                        &m5mols_ctrl_ops, V4L2_CID_COLORFX,
                        4, (1 << V4L2_COLORFX_BW), V4L2_COLORFX_NONE);
        info->autoexposure = v4l2_ctrl_new_std_menu(&info->handle,
                        &m5mols_ctrl_ops, V4L2_CID_EXPOSURE_AUTO,
                        1, 0, V4L2_EXPOSURE_MANUAL);

        sd->ctrl_handler = &info->handle;
        if (info->handle.error) {
                v4l2_err(sd, "Failed to initialize controls: %d\n", ret);
                v4l2_ctrl_handler_free(&info->handle);
                return info->handle.error;
        }

        v4l2_ctrl_cluster(2, &info->autoexposure);

        return 0;
}

/**
 * m5mols_s_power - Main sensor power control function
 *
 * To prevent breaking the lens when the sensor is powered off the Soft-Landing
 * algorithm is called where available. The Soft-Landing algorithm availability
 * dependends on the firmware provider.
 */
static int m5mols_s_power(struct v4l2_subdev *sd, int on)
{
        struct m5mols_info *info = to_m5mols(sd);
        int ret;

        if (on) {
                ret = m5mols_sensor_power(info, true);
                if (!ret)
                        ret = m5mols_sensor_armboot(sd);
                if (!ret)
                        ret = m5mols_init_controls(info);
                if (ret)
                        return ret;

                info->ffmt[M5MOLS_RESTYPE_MONITOR] =
                        m5mols_default_ffmt[M5MOLS_RESTYPE_MONITOR];
                info->ffmt[M5MOLS_RESTYPE_CAPTURE] =
                        m5mols_default_ffmt[M5MOLS_RESTYPE_CAPTURE];
                return ret;
        }

        if (is_manufacturer(info, REG_SAMSUNG_TECHWIN)) {
                ret = m5mols_mode(info, REG_MONITOR);
                if (!ret)
                        ret = m5mols_write(sd, AF_EXECUTE, REG_AF_STOP);
                if (!ret)
                        ret = m5mols_write(sd, AF_MODE, REG_AF_POWEROFF);
                if (!ret)
                        ret = m5mols_busy(sd, CAT_SYSTEM, CAT0_STATUS,
                                        REG_AF_IDLE);
                if (!ret)
                        v4l2_info(sd, "Success soft-landing lens\n");
        }

        ret = m5mols_sensor_power(info, false);
        if (!ret) {
                v4l2_ctrl_handler_free(&info->handle);
                info->ctrl_sync = false;
        }

        return ret;
}

static int m5mols_log_status(struct v4l2_subdev *sd)
{
        struct m5mols_info *info = to_m5mols(sd);

        v4l2_ctrl_handler_log_status(&info->handle, sd->name);

        return 0;
}

static const struct v4l2_subdev_core_ops m5mols_core_ops = {
        .s_power        = m5mols_s_power,
        .g_ctrl         = v4l2_subdev_g_ctrl,
        .s_ctrl         = v4l2_subdev_s_ctrl,
        .queryctrl      = v4l2_subdev_queryctrl,
        .querymenu      = v4l2_subdev_querymenu,
        .g_ext_ctrls    = v4l2_subdev_g_ext_ctrls,
        .try_ext_ctrls  = v4l2_subdev_try_ext_ctrls,
        .s_ext_ctrls    = v4l2_subdev_s_ext_ctrls,
        .log_status     = m5mols_log_status,
};

static const struct v4l2_subdev_ops m5mols_ops = {
        .core           = &m5mols_core_ops,
        .pad            = &m5mols_pad_ops,
        .video          = &m5mols_video_ops,
};

static void m5mols_irq_work(struct work_struct *work)
{
        struct m5mols_info *info =
                container_of(work, struct m5mols_info, work_irq);
        struct v4l2_subdev *sd = &info->sd;
        u8 reg;
        int ret;

        if (!is_powered(info) ||
                        m5mols_read_u8(sd, SYSTEM_INT_FACTOR, &info->interrupt))
                return;

        switch (info->interrupt & REG_INT_MASK) {
        case REG_INT_AF:
                if (!is_available_af(info))
                        break;
                ret = m5mols_read_u8(sd, AF_STATUS, &reg);
                v4l2_dbg(2, m5mols_debug, sd, "AF %s\n",
                         reg == REG_AF_FAIL ? "Failed" :
                         reg == REG_AF_SUCCESS ? "Success" :
                         reg == REG_AF_IDLE ? "Idle" : "Busy");
                break;
        case REG_INT_CAPTURE:
                if (!test_and_set_bit(ST_CAPT_IRQ, &info->flags))
                        wake_up_interruptible(&info->irq_waitq);

                v4l2_dbg(2, m5mols_debug, sd, "CAPTURE\n");
                break;
        default:
                v4l2_dbg(2, m5mols_debug, sd, "Undefined: %02x\n", reg);
                break;
        };
}

static irqreturn_t m5mols_irq_handler(int irq, void *data)
{
        struct v4l2_subdev *sd = data;
        struct m5mols_info *info = to_m5mols(sd);

        schedule_work(&info->work_irq);

        return IRQ_HANDLED;
}

static int __devinit m5mols_probe(struct i2c_client *client,
                                  const struct i2c_device_id *id)
{
        const struct m5mols_platform_data *pdata = client->dev.platform_data;
        struct m5mols_info *info;
        struct v4l2_subdev *sd;
        int ret;

        if (pdata == NULL) {
                dev_err(&client->dev, "No platform data\n");
                return -EINVAL;
        }

        if (!gpio_is_valid(pdata->gpio_reset)) {
                dev_err(&client->dev, "No valid RESET GPIO specified\n");
                return -EINVAL;
        }

        if (!client->irq) {
                dev_err(&client->dev, "Interrupt not assigned\n");
                return -EINVAL;
        }

        info = kzalloc(sizeof(struct m5mols_info), GFP_KERNEL);
        if (!info)
                return -ENOMEM;

        info->pdata = pdata;
        info->set_power = pdata->set_power;

        ret = gpio_request(pdata->gpio_reset, "M5MOLS_NRST");
        if (ret) {
                dev_err(&client->dev, "Failed to request gpio: %d\n", ret);
                goto out_free;
        }
        gpio_direction_output(pdata->gpio_reset, pdata->reset_polarity);

        ret = regulator_bulk_get(&client->dev, ARRAY_SIZE(supplies), supplies);
        if (ret) {
                dev_err(&client->dev, "Failed to get regulators: %d\n", ret);
                goto out_gpio;
        }

        sd = &info->sd;
        strlcpy(sd->name, MODULE_NAME, sizeof(sd->name));
        v4l2_i2c_subdev_init(sd, client, &m5mols_ops);

        info->pad.flags = MEDIA_PAD_FL_SOURCE;
        ret = media_entity_init(&sd->entity, 1, &info->pad, 0);
        if (ret < 0)
                goto out_reg;
        sd->entity.type = MEDIA_ENT_T_V4L2_SUBDEV_SENSOR;

        init_waitqueue_head(&info->irq_waitq);
        INIT_WORK(&info->work_irq, m5mols_irq_work);
        ret = request_irq(client->irq, m5mols_irq_handler,
                          IRQF_TRIGGER_RISING, MODULE_NAME, sd);
        if (ret) {
                dev_err(&client->dev, "Interrupt request failed: %d\n", ret);
                goto out_me;
        }
        info->res_type = M5MOLS_RESTYPE_MONITOR;
        return 0;
out_me:
        media_entity_cleanup(&sd->entity);
out_reg:
        regulator_bulk_free(ARRAY_SIZE(supplies), supplies);
out_gpio:
        gpio_free(pdata->gpio_reset);
out_free:
        kfree(info);
        return ret;
}

static int __devexit m5mols_remove(struct i2c_client *client)
{
        struct v4l2_subdev *sd = i2c_get_clientdata(client);
        struct m5mols_info *info = to_m5mols(sd);

        v4l2_device_unregister_subdev(sd);
        free_irq(client->irq, sd);

        regulator_bulk_free(ARRAY_SIZE(supplies), supplies);
        gpio_free(info->pdata->gpio_reset);
        media_entity_cleanup(&sd->entity);
        kfree(info);
        return 0;
}

static const struct i2c_device_id m5mols_id[] = {
        { MODULE_NAME, 0 },
        { },
};
MODULE_DEVICE_TABLE(i2c, m5mols_id);

static struct i2c_driver m5mols_i2c_driver = {
        .driver = {
                .name   = MODULE_NAME,
        },
        .probe          = m5mols_probe,
        .remove         = __devexit_p(m5mols_remove),
        .id_table       = m5mols_id,
};

static int __init m5mols_mod_init(void)
{
        return i2c_add_driver(&m5mols_i2c_driver);
}

static void __exit m5mols_mod_exit(void)
{
        i2c_del_driver(&m5mols_i2c_driver);
}

module_init(m5mols_mod_init);
module_exit(m5mols_mod_exit);

MODULE_AUTHOR("HeungJun Kim <riverful.kim@samsung.com>");
MODULE_AUTHOR("Dongsoo Kim <dongsoo45.kim@samsung.com>");
MODULE_DESCRIPTION("Fujitsu M-5MOLS 8M Pixel camera driver");
MODULE_LICENSE("GPL");