linux-imx

// SPDX-License-Identifier: GPL-2.0

/*

 * Driver for MT9M001 CMOS Image Sensor from Micron

 *

 * Copyright (C) 2008, Guennadi Liakhovetski <kernel@pengutronix.de>

 */

​

#include <linux/clk.h>

#include <linux/delay.h>

#include <linux/gpio/consumer.h>

#include <linux/i2c.h>

#include <linux/log2.h>

#include <linux/module.h>

#include <linux/pm_runtime.h>

#include <linux/slab.h>

#include <linux/videodev2.h>

​

#include <media/v4l2-ctrls.h>

#include <media/v4l2-device.h>

#include <media/v4l2-event.h>

#include <media/v4l2-subdev.h>

​

/*

 * mt9m001 i2c address 0x5d

 */

​

/* mt9m001 selected register addresses */

#define MT9M001_CHIP_VERSION        0x00

#define MT9M001_ROW_START       0x01

#define MT9M001_COLUMN_START        0x02

#define MT9M001_WINDOW_HEIGHT       0x03

#define MT9M001_WINDOW_WIDTH        0x04

#define MT9M001_HORIZONTAL_BLANKING 0x05

#define MT9M001_VERTICAL_BLANKING   0x06

#define MT9M001_OUTPUT_CONTROL      0x07

#define MT9M001_SHUTTER_WIDTH       0x09

#define MT9M001_FRAME_RESTART       0x0b

#define MT9M001_SHUTTER_DELAY       0x0c

#define MT9M001_RESET           0x0d

#define MT9M001_READ_OPTIONS1       0x1e

#define MT9M001_READ_OPTIONS2       0x20

#define MT9M001_GLOBAL_GAIN     0x35

#define MT9M001_CHIP_ENABLE     0xF1

​

#define MT9M001_MAX_WIDTH       1280

#define MT9M001_MAX_HEIGHT      1024

#define MT9M001_MIN_WIDTH       48

#define MT9M001_MIN_HEIGHT      32

#define MT9M001_COLUMN_SKIP     20

#define MT9M001_ROW_SKIP        12

#define MT9M001_DEFAULT_HBLANK      9

#define MT9M001_DEFAULT_VBLANK      25

​

/* MT9M001 has only one fixed colorspace per pixelcode */

struct mt9m001_datafmt {

    u32 code;

    enum v4l2_colorspace        colorspace;

};

​

/* Find a data format by a pixel code in an array */

static const struct mt9m001_datafmt *mt9m001_find_datafmt(

    u32 code, const struct mt9m001_datafmt *fmt,

    int n)

{

    int i;

    for (i = 0; i < n; i++)

        if (fmt[i].code == code)

            return fmt + i;

​

    return NULL;

}

​

static const struct mt9m001_datafmt mt9m001_colour_fmts[] = {

    /*

     * Order important: first natively supported,

     * second supported with a GPIO extender

     */

    {MEDIA_BUS_FMT_SBGGR10_1X10, V4L2_COLORSPACE_SRGB},

    {MEDIA_BUS_FMT_SBGGR8_1X8, V4L2_COLORSPACE_SRGB},

};

​

static const struct mt9m001_datafmt mt9m001_monochrome_fmts[] = {

    /* Order important - see above */

    {MEDIA_BUS_FMT_Y10_1X10, V4L2_COLORSPACE_JPEG},

    {MEDIA_BUS_FMT_Y8_1X8, V4L2_COLORSPACE_JPEG},

};

​

struct mt9m001 {

    struct v4l2_subdev subdev;

    struct v4l2_ctrl_handler hdl;

    struct {

        /* exposure/auto-exposure cluster */