m5mols_core.c

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/*
 * Driver for M-5MOLS 8M Pixel camera sensor with ISP
 *
 * Copyright (C) 2011 Samsung Electronics Co., Ltd.
 * Author: HeungJun Kim <[email protected]>
 *
 * Copyright (C) 2009 Samsung Electronics Co., Ltd.
 * Author: Dongsoo Nathaniel Kim <[email protected]>
 *
 * 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 */
};

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));
}

static int m5mols_read(struct v4l2_subdev *sd, u32 size, u32 reg, u32 *val)
{
    struct i2c_client *client = v4l2_get_subdevdata(sd);
    struct m5mols_info *info = to_m5mols(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 == 2) {
        *val = m5mols_swap_byte(&rbuf[1], size);
        return 0;
    }

    if (info->isp_ready)
        v4l2_err(sd, "read failed: size:%d cat:%02x cmd:%02x. %d\n",
             size, category, cmd, ret);

    return ret < 0 ? ret : -EIO;
}

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);
}

int m5mols_write(struct v4l2_subdev *sd, u32 reg, u32 val)
{
    struct i2c_client *client = v4l2_get_subdevdata(sd);
    struct m5mols_info *info = to_m5mols(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 == 1)
        return 0;

    if (info->isp_ready)
        v4l2_err(sd, "write failed: cat:%02x cmd:%02x ret:%d\n",
             category, cmd, ret);

    return ret < 0 ? ret : -EIO;
}

int m5mols_busy_wait(struct v4l2_subdev *sd, u32 reg, u32 value, u32 mask,
             int timeout)
{
    int ms = timeout < 0 ? M5MOLS_BUSY_WAIT_DEF_TIMEOUT : timeout;
    unsigned long end = jiffies + msecs_to_jiffies(ms);
    u8 status;

    do {
        int ret = m5mols_read_u8(sd, reg, &status);

        if (ret < 0 && !(mask & M5MOLS_I2C_RDY_WAIT_FL))
            return ret;
        if (!ret && (status & mask & 0xff) == (value & 0xff))
            return 0;
        usleep_range(100, 250);
    } while (ms > 0 && time_is_after_jiffies(end));

    return -EBUSY;
}

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;
}

int m5mols_wait_interrupt(struct v4l2_subdev *sd, u8 irq_mask, u32 timeout)
{
    struct m5mols_info *info = to_m5mols(sd);

    int ret = wait_event_interruptible_timeout(info->irq_waitq,
                atomic_add_unless(&info->irq_done, -1, 0),
                msecs_to_jiffies(timeout));
    if (ret <= 0)
        return ret ? ret : -ETIMEDOUT;

    return m5mols_busy_wait(sd, SYSTEM_INT_FACTOR, irq_mask,
                M5MOLS_I2C_RDY_WAIT_FL | irq_mask, -1);
}

static int m5mols_reg_mode(struct v4l2_subdev *sd, u8 mode)
{
    int ret = m5mols_write(sd, SYSTEM_SYSMODE, mode);
    if (ret < 0)
        return ret;
    return m5mols_busy_wait(sd, SYSTEM_SYSMODE, mode, 0xff,
                M5MOLS_MODE_CHANGE_TIMEOUT);
}

int m5mols_set_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)
        return ret;

    switch (reg) {
    case REG_PARAMETER:
        ret = m5mols_reg_mode(sd, REG_MONITOR);
        if (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 (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;
}

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;
}

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;
}

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;
    int ret = 0;

    mutex_lock(&info->lock);

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

    mutex_unlock(&info->lock);
    return ret;
}

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;

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

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

    mutex_lock(&info->lock);

    format->code = m5mols_default_ffmt[type].code;
    format->colorspace = V4L2_COLORSPACE_JPEG;
    format->field = V4L2_FIELD_NONE;

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

    mutex_unlock(&info->lock);
    return ret;
}

static int m5mols_get_frame_desc(struct v4l2_subdev *sd, unsigned int pad,
                 struct v4l2_mbus_frame_desc *fd)
{
    struct m5mols_info *info = to_m5mols(sd);

    if (pad != 0 || fd == NULL)
        return -EINVAL;

    mutex_lock(&info->lock);
    /*
     * .get_frame_desc is only used for compressed formats,
     * thus we always return the capture frame parameters here.
     */
    fd->entry[0].length = info->cap.buf_size;
    fd->entry[0].pixelcode = info->ffmt[M5MOLS_RESTYPE_CAPTURE].code;
    mutex_unlock(&info->lock);

    fd->entry[0].flags = V4L2_MBUS_FRAME_DESC_FL_LEN_MAX;
    fd->num_entries = 1;

    return 0;
}

static int m5mols_set_frame_desc(struct v4l2_subdev *sd, unsigned int pad,
                 struct v4l2_mbus_frame_desc *fd)
{
    struct m5mols_info *info = to_m5mols(sd);
    struct v4l2_mbus_framefmt *mf = &info->ffmt[M5MOLS_RESTYPE_CAPTURE];

    if (pad != 0 || fd == NULL)
        return -EINVAL;

    fd->entry[0].flags = V4L2_MBUS_FRAME_DESC_FL_LEN_MAX;
    fd->num_entries = 1;
    fd->entry[0].length = clamp_t(u32, fd->entry[0].length,
                      mf->width * mf->height,
                      M5MOLS_MAIN_JPEG_SIZE_MAX);
    mutex_lock(&info->lock);
    info->cap.buf_size = fd->entry[0].length;
    mutex_unlock(&info->lock);

    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,
    .get_frame_desc = m5mols_get_frame_desc,
    .set_frame_desc = m5mols_set_frame_desc,
};

int m5mols_restore_controls(struct m5mols_info *info)
{
    int ret;

    if (info->ctrl_sync)
        return 0;

    ret = m5mols_do_scenemode(info, REG_SCENE_NORMAL);
    if (ret)
        return ret;

    ret = v4l2_ctrl_handler_setup(&info->handle);
    info->ctrl_sync = !ret;

    return ret;
}

static int m5mols_start_monitor(struct m5mols_info *info)
{
    struct v4l2_subdev *sd = &info->sd;
    int ret;

    ret = m5mols_set_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_set_mode(info, REG_MONITOR);
    if (!ret)
        ret = m5mols_restore_controls(info);

    return ret;
}

static int m5mols_s_stream(struct v4l2_subdev *sd, int enable)
{
    struct m5mols_info *info = to_m5mols(sd);
    u32 code;
    int ret;

    mutex_lock(&info->lock);
    code = info->ffmt[info->res_type].code;

    if (enable) {
        if (is_code(code, M5MOLS_RESTYPE_MONITOR))
            ret = m5mols_start_monitor(info);
        if (is_code(code, M5MOLS_RESTYPE_CAPTURE))
            ret = m5mols_start_capture(info);
        else
            ret = -EINVAL;
    } else {
        ret = m5mols_set_mode(info, REG_PARAMETER);
    }

    mutex_unlock(&info->lock);
    return ret;
}

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

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 (info->power == enable)
        return 0;

    if (enable) {
        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);
        info->power = 1;

        return ret;
    }

    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);

    info->isp_ready = 0;
    info->power = 0;

    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;
}

static int m5mols_fw_start(struct v4l2_subdev *sd)
{
    struct m5mols_info *info = to_m5mols(sd);
    int ret;

    atomic_set(&info->irq_done, 0);
    /* Wait until I2C slave is initialized in Flash Writer mode */
    ret = m5mols_busy_wait(sd, FLASH_CAM_START, REG_IN_FLASH_MODE,
                   M5MOLS_I2C_RDY_WAIT_FL | 0xff, -1);
    if (!ret)
        ret = m5mols_write(sd, FLASH_CAM_START, REG_START_ARM_BOOT);
    if (!ret)
        ret = m5mols_wait_interrupt(sd, REG_INT_MODE, 2000);
    if (ret < 0)
        return ret;

    info->isp_ready = 1;

    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 | REG_INT_CAPTURE);

    return ret;
}

/* Execute the lens soft-landing algorithm */
static int m5mols_auto_focus_stop(struct m5mols_info *info)
{
    int ret;

    ret = m5mols_write(&info->sd, AF_EXECUTE, REG_AF_STOP);
    if (!ret)
        ret = m5mols_write(&info->sd, AF_MODE, REG_AF_POWEROFF);
    if (!ret)
        ret = m5mols_busy_wait(&info->sd, SYSTEM_STATUS, REG_AF_IDLE,
                       0xff, -1);
    return ret;
}

static int m5mols_s_power(struct v4l2_subdev *sd, int on)
{
    struct m5mols_info *info = to_m5mols(sd);
    int ret;

    mutex_lock(&info->lock);

    if (on) {
        ret = m5mols_sensor_power(info, true);
        if (!ret)
            ret = m5mols_fw_start(sd);
    } else {
        if (is_manufacturer(info, REG_SAMSUNG_TECHWIN)) {
            ret = m5mols_set_mode(info, REG_MONITOR);
            if (!ret)
                ret = m5mols_auto_focus_stop(info);
            if (ret < 0)
                v4l2_warn(sd, "Soft landing lens failed\n");
        }
        ret = m5mols_sensor_power(info, false);

        info->ctrl_sync = 0;
    }

    mutex_unlock(&info->lock);
    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,
    .log_status = m5mols_log_status,
};

/*
 * V4L2 subdev internal operations
 */
static int m5mols_open(struct v4l2_subdev *sd, struct v4l2_subdev_fh *fh)
{
    struct v4l2_mbus_framefmt *format = v4l2_subdev_get_try_format(fh, 0);

    *format = m5mols_default_ffmt[0];
    return 0;
}

static const struct v4l2_subdev_internal_ops m5mols_subdev_internal_ops = {
    .open       = m5mols_open,
};

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

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

    atomic_set(&info->irq_done, 1);
    wake_up_interruptible(&info->irq_waitq);

    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;
    v4l2_i2c_subdev_init(sd, client, &m5mols_ops);
    strlcpy(sd->name, MODULE_NAME, sizeof(sd->name));
    sd->flags |= V4L2_SUBDEV_FL_HAS_DEVNODE;

    sd->internal_ops = &m5mols_subdev_internal_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);
    mutex_init(&info->lock);

    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;
    info->ffmt[0] = m5mols_default_ffmt[0];
    info->ffmt[1] = m5mols_default_ffmt[1];

    ret = m5mols_sensor_power(info, true);
    if (ret)
        goto out_irq;

    ret = m5mols_fw_start(sd);
    if (!ret)
        ret = m5mols_init_controls(sd);

    ret = m5mols_sensor_power(info, false);
    if (!ret)
        return 0;
out_irq:
    free_irq(client->irq, sd);
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);
    v4l2_ctrl_handler_free(sd->ctrl_handler);
    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,
};

module_i2c_driver(m5mols_i2c_driver);

MODULE_AUTHOR("HeungJun Kim <[email protected]>");
MODULE_AUTHOR("Dongsoo Kim <[email protected]>");
MODULE_DESCRIPTION("Fujitsu M-5MOLS 8M Pixel camera driver");
MODULE_LICENSE("GPL");