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[pohmelfs.git] / drivers / media / video / ov9740.c

/*
 * OmniVision OV9740 Camera Driver
 *
 * Copyright (C) 2011 NVIDIA Corporation
 *
 * Based on ov9640 camera driver.
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License version 2 as
 * published by the Free Software Foundation.
 */

#include <linux/init.h>
#include <linux/module.h>
#include <linux/i2c.h>
#include <linux/slab.h>
#include <linux/v4l2-mediabus.h>

#include <media/soc_camera.h>
#include <media/v4l2-chip-ident.h>
#include <media/v4l2-ctrls.h>

#define to_ov9740(sd)           container_of(sd, struct ov9740_priv, subdev)

/* General Status Registers */
#define OV9740_MODEL_ID_HI              0x0000
#define OV9740_MODEL_ID_LO              0x0001
#define OV9740_REVISION_NUMBER          0x0002
#define OV9740_MANUFACTURER_ID          0x0003
#define OV9740_SMIA_VERSION             0x0004

/* General Setup Registers */
#define OV9740_MODE_SELECT              0x0100
#define OV9740_IMAGE_ORT                0x0101
#define OV9740_SOFTWARE_RESET           0x0103
#define OV9740_GRP_PARAM_HOLD           0x0104
#define OV9740_MSK_CORRUP_FM            0x0105

/* Timing Setting */
#define OV9740_FRM_LENGTH_LN_HI         0x0340 /* VTS */
#define OV9740_FRM_LENGTH_LN_LO         0x0341 /* VTS */
#define OV9740_LN_LENGTH_PCK_HI         0x0342 /* HTS */
#define OV9740_LN_LENGTH_PCK_LO         0x0343 /* HTS */
#define OV9740_X_ADDR_START_HI          0x0344
#define OV9740_X_ADDR_START_LO          0x0345
#define OV9740_Y_ADDR_START_HI          0x0346
#define OV9740_Y_ADDR_START_LO          0x0347
#define OV9740_X_ADDR_END_HI            0x0348
#define OV9740_X_ADDR_END_LO            0x0349
#define OV9740_Y_ADDR_END_HI            0x034a
#define OV9740_Y_ADDR_END_LO            0x034b
#define OV9740_X_OUTPUT_SIZE_HI         0x034c
#define OV9740_X_OUTPUT_SIZE_LO         0x034d
#define OV9740_Y_OUTPUT_SIZE_HI         0x034e
#define OV9740_Y_OUTPUT_SIZE_LO         0x034f

/* IO Control Registers */
#define OV9740_IO_CREL00                0x3002
#define OV9740_IO_CREL01                0x3004
#define OV9740_IO_CREL02                0x3005
#define OV9740_IO_OUTPUT_SEL01          0x3026
#define OV9740_IO_OUTPUT_SEL02          0x3027

/* AWB Registers */
#define OV9740_AWB_MANUAL_CTRL          0x3406

/* Analog Control Registers */
#define OV9740_ANALOG_CTRL01            0x3601
#define OV9740_ANALOG_CTRL02            0x3602
#define OV9740_ANALOG_CTRL03            0x3603
#define OV9740_ANALOG_CTRL04            0x3604
#define OV9740_ANALOG_CTRL10            0x3610
#define OV9740_ANALOG_CTRL12            0x3612
#define OV9740_ANALOG_CTRL15            0x3615
#define OV9740_ANALOG_CTRL20            0x3620
#define OV9740_ANALOG_CTRL21            0x3621
#define OV9740_ANALOG_CTRL22            0x3622
#define OV9740_ANALOG_CTRL30            0x3630
#define OV9740_ANALOG_CTRL31            0x3631
#define OV9740_ANALOG_CTRL32            0x3632
#define OV9740_ANALOG_CTRL33            0x3633

/* Sensor Control */
#define OV9740_SENSOR_CTRL03            0x3703
#define OV9740_SENSOR_CTRL04            0x3704
#define OV9740_SENSOR_CTRL05            0x3705
#define OV9740_SENSOR_CTRL07            0x3707

/* Timing Control */
#define OV9740_TIMING_CTRL17            0x3817
#define OV9740_TIMING_CTRL19            0x3819
#define OV9740_TIMING_CTRL33            0x3833
#define OV9740_TIMING_CTRL35            0x3835

/* Banding Filter */
#define OV9740_AEC_MAXEXPO_60_H         0x3a02
#define OV9740_AEC_MAXEXPO_60_L         0x3a03
#define OV9740_AEC_B50_STEP_HI          0x3a08
#define OV9740_AEC_B50_STEP_LO          0x3a09
#define OV9740_AEC_B60_STEP_HI          0x3a0a
#define OV9740_AEC_B60_STEP_LO          0x3a0b
#define OV9740_AEC_CTRL0D               0x3a0d
#define OV9740_AEC_CTRL0E               0x3a0e
#define OV9740_AEC_MAXEXPO_50_H         0x3a14
#define OV9740_AEC_MAXEXPO_50_L         0x3a15

/* AEC/AGC Control */
#define OV9740_AEC_ENABLE               0x3503
#define OV9740_GAIN_CEILING_01          0x3a18
#define OV9740_GAIN_CEILING_02          0x3a19
#define OV9740_AEC_HI_THRESHOLD         0x3a11
#define OV9740_AEC_3A1A                 0x3a1a
#define OV9740_AEC_CTRL1B_WPT2          0x3a1b
#define OV9740_AEC_CTRL0F_WPT           0x3a0f
#define OV9740_AEC_CTRL10_BPT           0x3a10
#define OV9740_AEC_CTRL1E_BPT2          0x3a1e
#define OV9740_AEC_LO_THRESHOLD         0x3a1f

/* BLC Control */
#define OV9740_BLC_AUTO_ENABLE          0x4002
#define OV9740_BLC_MODE                 0x4005

/* VFIFO */
#define OV9740_VFIFO_READ_START_HI      0x4608
#define OV9740_VFIFO_READ_START_LO      0x4609

/* DVP Control */
#define OV9740_DVP_VSYNC_CTRL02         0x4702
#define OV9740_DVP_VSYNC_MODE           0x4704
#define OV9740_DVP_VSYNC_CTRL06         0x4706

/* PLL Setting */
#define OV9740_PLL_MODE_CTRL01          0x3104
#define OV9740_PRE_PLL_CLK_DIV          0x0305
#define OV9740_PLL_MULTIPLIER           0x0307
#define OV9740_VT_SYS_CLK_DIV           0x0303
#define OV9740_VT_PIX_CLK_DIV           0x0301
#define OV9740_PLL_CTRL3010             0x3010
#define OV9740_VFIFO_CTRL00             0x460e

/* ISP Control */
#define OV9740_ISP_CTRL00               0x5000
#define OV9740_ISP_CTRL01               0x5001
#define OV9740_ISP_CTRL03               0x5003
#define OV9740_ISP_CTRL05               0x5005
#define OV9740_ISP_CTRL12               0x5012
#define OV9740_ISP_CTRL19               0x5019
#define OV9740_ISP_CTRL1A               0x501a
#define OV9740_ISP_CTRL1E               0x501e
#define OV9740_ISP_CTRL1F               0x501f
#define OV9740_ISP_CTRL20               0x5020
#define OV9740_ISP_CTRL21               0x5021

/* AWB */
#define OV9740_AWB_CTRL00               0x5180
#define OV9740_AWB_CTRL01               0x5181
#define OV9740_AWB_CTRL02               0x5182
#define OV9740_AWB_CTRL03               0x5183
#define OV9740_AWB_ADV_CTRL01           0x5184
#define OV9740_AWB_ADV_CTRL02           0x5185
#define OV9740_AWB_ADV_CTRL03           0x5186
#define OV9740_AWB_ADV_CTRL04           0x5187
#define OV9740_AWB_ADV_CTRL05           0x5188
#define OV9740_AWB_ADV_CTRL06           0x5189
#define OV9740_AWB_ADV_CTRL07           0x518a
#define OV9740_AWB_ADV_CTRL08           0x518b
#define OV9740_AWB_ADV_CTRL09           0x518c
#define OV9740_AWB_ADV_CTRL10           0x518d
#define OV9740_AWB_ADV_CTRL11           0x518e
#define OV9740_AWB_CTRL0F               0x518f
#define OV9740_AWB_CTRL10               0x5190
#define OV9740_AWB_CTRL11               0x5191
#define OV9740_AWB_CTRL12               0x5192
#define OV9740_AWB_CTRL13               0x5193
#define OV9740_AWB_CTRL14               0x5194

/* MIPI Control */
#define OV9740_MIPI_CTRL00              0x4800
#define OV9740_MIPI_3837                0x3837
#define OV9740_MIPI_CTRL01              0x4801
#define OV9740_MIPI_CTRL03              0x4803
#define OV9740_MIPI_CTRL05              0x4805
#define OV9740_VFIFO_RD_CTRL            0x4601
#define OV9740_MIPI_CTRL_3012           0x3012
#define OV9740_SC_CMMM_MIPI_CTR         0x3014

#define OV9740_MAX_WIDTH                1280
#define OV9740_MAX_HEIGHT               720

/* Misc. structures */
struct ov9740_reg {
        u16                             reg;
        u8                              val;
};

struct ov9740_priv {
        struct v4l2_subdev              subdev;
        struct v4l2_ctrl_handler        hdl;

        int                             ident;
        u16                             model;
        u8                              revision;
        u8                              manid;
        u8                              smiaver;

        bool                            flag_vflip;
        bool                            flag_hflip;

        /* For suspend/resume. */
        struct v4l2_mbus_framefmt       current_mf;
        bool                            current_enable;
};

static const struct ov9740_reg ov9740_defaults[] = {
        /* Software Reset */
        { OV9740_SOFTWARE_RESET,        0x01 },

        /* Banding Filter */
        { OV9740_AEC_B50_STEP_HI,       0x00 },
        { OV9740_AEC_B50_STEP_LO,       0xe8 },
        { OV9740_AEC_CTRL0E,            0x03 },
        { OV9740_AEC_MAXEXPO_50_H,      0x15 },
        { OV9740_AEC_MAXEXPO_50_L,      0xc6 },
        { OV9740_AEC_B60_STEP_HI,       0x00 },
        { OV9740_AEC_B60_STEP_LO,       0xc0 },
        { OV9740_AEC_CTRL0D,            0x04 },
        { OV9740_AEC_MAXEXPO_60_H,      0x18 },
        { OV9740_AEC_MAXEXPO_60_L,      0x20 },

        /* LC */
        { 0x5842, 0x02 }, { 0x5843, 0x5e }, { 0x5844, 0x04 }, { 0x5845, 0x32 },
        { 0x5846, 0x03 }, { 0x5847, 0x29 }, { 0x5848, 0x02 }, { 0x5849, 0xcc },

        /* Un-documented OV9740 registers */
        { 0x5800, 0x29 }, { 0x5801, 0x25 }, { 0x5802, 0x20 }, { 0x5803, 0x21 },
        { 0x5804, 0x26 }, { 0x5805, 0x2e }, { 0x5806, 0x11 }, { 0x5807, 0x0c },
        { 0x5808, 0x09 }, { 0x5809, 0x0a }, { 0x580a, 0x0e }, { 0x580b, 0x16 },
        { 0x580c, 0x06 }, { 0x580d, 0x02 }, { 0x580e, 0x00 }, { 0x580f, 0x00 },
        { 0x5810, 0x04 }, { 0x5811, 0x0a }, { 0x5812, 0x05 }, { 0x5813, 0x02 },
        { 0x5814, 0x00 }, { 0x5815, 0x00 }, { 0x5816, 0x03 }, { 0x5817, 0x09 },
        { 0x5818, 0x0f }, { 0x5819, 0x0a }, { 0x581a, 0x07 }, { 0x581b, 0x08 },
        { 0x581c, 0x0b }, { 0x581d, 0x14 }, { 0x581e, 0x28 }, { 0x581f, 0x23 },
        { 0x5820, 0x1d }, { 0x5821, 0x1e }, { 0x5822, 0x24 }, { 0x5823, 0x2a },
        { 0x5824, 0x4f }, { 0x5825, 0x6f }, { 0x5826, 0x5f }, { 0x5827, 0x7f },
        { 0x5828, 0x9f }, { 0x5829, 0x5f }, { 0x582a, 0x8f }, { 0x582b, 0x9e },
        { 0x582c, 0x8f }, { 0x582d, 0x9f }, { 0x582e, 0x4f }, { 0x582f, 0x87 },
        { 0x5830, 0x86 }, { 0x5831, 0x97 }, { 0x5832, 0xae }, { 0x5833, 0x3f },
        { 0x5834, 0x8e }, { 0x5835, 0x7c }, { 0x5836, 0x7e }, { 0x5837, 0xaf },
        { 0x5838, 0x8f }, { 0x5839, 0x8f }, { 0x583a, 0x9f }, { 0x583b, 0x7f },
        { 0x583c, 0x5f },

        /* Y Gamma */
        { 0x5480, 0x07 }, { 0x5481, 0x18 }, { 0x5482, 0x2c }, { 0x5483, 0x4e },
        { 0x5484, 0x5e }, { 0x5485, 0x6b }, { 0x5486, 0x77 }, { 0x5487, 0x82 },
        { 0x5488, 0x8c }, { 0x5489, 0x95 }, { 0x548a, 0xa4 }, { 0x548b, 0xb1 },
        { 0x548c, 0xc6 }, { 0x548d, 0xd8 }, { 0x548e, 0xe9 },

        /* UV Gamma */
        { 0x5490, 0x0f }, { 0x5491, 0xff }, { 0x5492, 0x0d }, { 0x5493, 0x05 },
        { 0x5494, 0x07 }, { 0x5495, 0x1a }, { 0x5496, 0x04 }, { 0x5497, 0x01 },
        { 0x5498, 0x03 }, { 0x5499, 0x53 }, { 0x549a, 0x02 }, { 0x549b, 0xeb },
        { 0x549c, 0x02 }, { 0x549d, 0xa0 }, { 0x549e, 0x02 }, { 0x549f, 0x67 },
        { 0x54a0, 0x02 }, { 0x54a1, 0x3b }, { 0x54a2, 0x02 }, { 0x54a3, 0x18 },
        { 0x54a4, 0x01 }, { 0x54a5, 0xe7 }, { 0x54a6, 0x01 }, { 0x54a7, 0xc3 },
        { 0x54a8, 0x01 }, { 0x54a9, 0x94 }, { 0x54aa, 0x01 }, { 0x54ab, 0x72 },
        { 0x54ac, 0x01 }, { 0x54ad, 0x57 },

        /* AWB */
        { OV9740_AWB_CTRL00,            0xf0 },
        { OV9740_AWB_CTRL01,            0x00 },
        { OV9740_AWB_CTRL02,            0x41 },
        { OV9740_AWB_CTRL03,            0x42 },
        { OV9740_AWB_ADV_CTRL01,        0x8a },
        { OV9740_AWB_ADV_CTRL02,        0x61 },
        { OV9740_AWB_ADV_CTRL03,        0xce },
        { OV9740_AWB_ADV_CTRL04,        0xa8 },
        { OV9740_AWB_ADV_CTRL05,        0x17 },
        { OV9740_AWB_ADV_CTRL06,        0x1f },
        { OV9740_AWB_ADV_CTRL07,        0x27 },
        { OV9740_AWB_ADV_CTRL08,        0x41 },
        { OV9740_AWB_ADV_CTRL09,        0x34 },
        { OV9740_AWB_ADV_CTRL10,        0xf0 },
        { OV9740_AWB_ADV_CTRL11,        0x10 },
        { OV9740_AWB_CTRL0F,            0xff },
        { OV9740_AWB_CTRL10,            0x00 },
        { OV9740_AWB_CTRL11,            0xff },
        { OV9740_AWB_CTRL12,            0x00 },
        { OV9740_AWB_CTRL13,            0xff },
        { OV9740_AWB_CTRL14,            0x00 },

        /* CIP */
        { 0x530d, 0x12 },

        /* CMX */
        { 0x5380, 0x01 }, { 0x5381, 0x00 }, { 0x5382, 0x00 }, { 0x5383, 0x17 },
        { 0x5384, 0x00 }, { 0x5385, 0x01 }, { 0x5386, 0x00 }, { 0x5387, 0x00 },
        { 0x5388, 0x00 }, { 0x5389, 0xe0 }, { 0x538a, 0x00 }, { 0x538b, 0x20 },
        { 0x538c, 0x00 }, { 0x538d, 0x00 }, { 0x538e, 0x00 }, { 0x538f, 0x16 },
        { 0x5390, 0x00 }, { 0x5391, 0x9c }, { 0x5392, 0x00 }, { 0x5393, 0xa0 },
        { 0x5394, 0x18 },

        /* 50/60 Detection */
        { 0x3c0a, 0x9c }, { 0x3c0b, 0x3f },

        /* Output Select */
        { OV9740_IO_OUTPUT_SEL01,       0x00 },
        { OV9740_IO_OUTPUT_SEL02,       0x00 },
        { OV9740_IO_CREL00,             0x00 },
        { OV9740_IO_CREL01,             0x00 },
        { OV9740_IO_CREL02,             0x00 },

        /* AWB Control */
        { OV9740_AWB_MANUAL_CTRL,       0x00 },

        /* Analog Control */
        { OV9740_ANALOG_CTRL03,         0xaa },
        { OV9740_ANALOG_CTRL32,         0x2f },
        { OV9740_ANALOG_CTRL20,         0x66 },
        { OV9740_ANALOG_CTRL21,         0xc0 },
        { OV9740_ANALOG_CTRL31,         0x52 },
        { OV9740_ANALOG_CTRL33,         0x50 },
        { OV9740_ANALOG_CTRL30,         0xca },
        { OV9740_ANALOG_CTRL04,         0x0c },
        { OV9740_ANALOG_CTRL01,         0x40 },
        { OV9740_ANALOG_CTRL02,         0x16 },
        { OV9740_ANALOG_CTRL10,         0xa1 },
        { OV9740_ANALOG_CTRL12,         0x24 },
        { OV9740_ANALOG_CTRL22,         0x9f },
        { OV9740_ANALOG_CTRL15,         0xf0 },

        /* Sensor Control */
        { OV9740_SENSOR_CTRL03,         0x42 },
        { OV9740_SENSOR_CTRL04,         0x10 },
        { OV9740_SENSOR_CTRL05,         0x45 },
        { OV9740_SENSOR_CTRL07,         0x14 },

        /* Timing Control */
        { OV9740_TIMING_CTRL33,         0x04 },
        { OV9740_TIMING_CTRL35,         0x02 },
        { OV9740_TIMING_CTRL19,         0x6e },
        { OV9740_TIMING_CTRL17,         0x94 },

        /* AEC/AGC Control */
        { OV9740_AEC_ENABLE,            0x10 },
        { OV9740_GAIN_CEILING_01,       0x00 },
        { OV9740_GAIN_CEILING_02,       0x7f },
        { OV9740_AEC_HI_THRESHOLD,      0xa0 },
        { OV9740_AEC_3A1A,              0x05 },
        { OV9740_AEC_CTRL1B_WPT2,       0x50 },
        { OV9740_AEC_CTRL0F_WPT,        0x50 },
        { OV9740_AEC_CTRL10_BPT,        0x4c },
        { OV9740_AEC_CTRL1E_BPT2,       0x4c },
        { OV9740_AEC_LO_THRESHOLD,      0x26 },

        /* BLC Control */
        { OV9740_BLC_AUTO_ENABLE,       0x45 },
        { OV9740_BLC_MODE,              0x18 },

        /* DVP Control */
        { OV9740_DVP_VSYNC_CTRL02,      0x04 },
        { OV9740_DVP_VSYNC_MODE,        0x00 },
        { OV9740_DVP_VSYNC_CTRL06,      0x08 },

        /* PLL Setting */
        { OV9740_PLL_MODE_CTRL01,       0x20 },
        { OV9740_PRE_PLL_CLK_DIV,       0x03 },
        { OV9740_PLL_MULTIPLIER,        0x4c },
        { OV9740_VT_SYS_CLK_DIV,        0x01 },
        { OV9740_VT_PIX_CLK_DIV,        0x08 },
        { OV9740_PLL_CTRL3010,          0x01 },
        { OV9740_VFIFO_CTRL00,          0x82 },

        /* Timing Setting */
        /* VTS */
        { OV9740_FRM_LENGTH_LN_HI,      0x03 },
        { OV9740_FRM_LENGTH_LN_LO,      0x07 },
        /* HTS */
        { OV9740_LN_LENGTH_PCK_HI,      0x06 },
        { OV9740_LN_LENGTH_PCK_LO,      0x62 },

        /* MIPI Control */
        { OV9740_MIPI_CTRL00,           0x44 }, /* 0x64 for discontinuous clk */
        { OV9740_MIPI_3837,             0x01 },
        { OV9740_MIPI_CTRL01,           0x0f },
        { OV9740_MIPI_CTRL03,           0x05 },
        { OV9740_MIPI_CTRL05,           0x10 },
        { OV9740_VFIFO_RD_CTRL,         0x16 },
        { OV9740_MIPI_CTRL_3012,        0x70 },
        { OV9740_SC_CMMM_MIPI_CTR,      0x01 },

        /* YUYV order */
        { OV9740_ISP_CTRL19,            0x02 },
};

static enum v4l2_mbus_pixelcode ov9740_codes[] = {
        V4L2_MBUS_FMT_YUYV8_2X8,
};

/* read a register */
static int ov9740_reg_read(struct i2c_client *client, u16 reg, u8 *val)
{
        int ret;
        struct i2c_msg msg[] = {
                {
                        .addr   = client->addr,
                        .flags  = 0,
                        .len    = 2,
                        .buf    = (u8 *)&reg,
                },
                {
                        .addr   = client->addr,
                        .flags  = I2C_M_RD,
                        .len    = 1,
                        .buf    = val,
                },
        };

        reg = swab16(reg);

        ret = i2c_transfer(client->adapter, msg, 2);
        if (ret < 0) {
                dev_err(&client->dev, "Failed reading register 0x%04x!\n", reg);
                return ret;
        }

        return 0;
}

/* write a register */
static int ov9740_reg_write(struct i2c_client *client, u16 reg, u8 val)
{
        struct i2c_msg msg;
        struct {
                u16 reg;
                u8 val;
        } __packed buf;
        int ret;

        reg = swab16(reg);

        buf.reg = reg;
        buf.val = val;

        msg.addr        = client->addr;
        msg.flags       = 0;
        msg.len         = 3;
        msg.buf         = (u8 *)&buf;

        ret = i2c_transfer(client->adapter, &msg, 1);
        if (ret < 0) {
                dev_err(&client->dev, "Failed writing register 0x%04x!\n", reg);
                return ret;
        }

        return 0;
}


/* Read a register, alter its bits, write it back */
static int ov9740_reg_rmw(struct i2c_client *client, u16 reg, u8 set, u8 unset)
{
        u8 val;
        int ret;

        ret = ov9740_reg_read(client, reg, &val);
        if (ret < 0) {
                dev_err(&client->dev,
                        "[Read]-Modify-Write of register 0x%04x failed!\n",
                        reg);
                return ret;
        }

        val |= set;
        val &= ~unset;

        ret = ov9740_reg_write(client, reg, val);
        if (ret < 0) {
                dev_err(&client->dev,
                        "Read-Modify-[Write] of register 0x%04x failed!\n",
                        reg);
                return ret;
        }

        return 0;
}

static int ov9740_reg_write_array(struct i2c_client *client,
                                  const struct ov9740_reg *regarray,
                                  int regarraylen)
{
        int i;
        int ret;

        for (i = 0; i < regarraylen; i++) {
                ret = ov9740_reg_write(client,
                                       regarray[i].reg, regarray[i].val);
                if (ret < 0)
                        return ret;
        }

        return 0;
}

/* Start/Stop streaming from the device */
static int ov9740_s_stream(struct v4l2_subdev *sd, int enable)
{
        struct i2c_client *client = v4l2_get_subdevdata(sd);
        struct ov9740_priv *priv = to_ov9740(sd);
        int ret;

        /* Program orientation register. */
        if (priv->flag_vflip)
                ret = ov9740_reg_rmw(client, OV9740_IMAGE_ORT, 0x2, 0);
        else
                ret = ov9740_reg_rmw(client, OV9740_IMAGE_ORT, 0, 0x2);
        if (ret < 0)
                return ret;

        if (priv->flag_hflip)
                ret = ov9740_reg_rmw(client, OV9740_IMAGE_ORT, 0x1, 0);
        else
                ret = ov9740_reg_rmw(client, OV9740_IMAGE_ORT, 0, 0x1);
        if (ret < 0)
                return ret;

        if (enable) {
                dev_dbg(&client->dev, "Enabling Streaming\n");
                /* Start Streaming */
                ret = ov9740_reg_write(client, OV9740_MODE_SELECT, 0x01);

        } else {
                dev_dbg(&client->dev, "Disabling Streaming\n");
                /* Software Reset */
                ret = ov9740_reg_write(client, OV9740_SOFTWARE_RESET, 0x01);
                if (!ret)
                        /* Setting Streaming to Standby */
                        ret = ov9740_reg_write(client, OV9740_MODE_SELECT,
                                               0x00);
        }

        priv->current_enable = enable;

        return ret;
}

/* select nearest higher resolution for capture */
static void ov9740_res_roundup(u32 *width, u32 *height)
{
        /* Width must be a multiple of 4 pixels. */
        *width = ALIGN(*width, 4);

        /* Max resolution is 1280x720 (720p). */
        if (*width > OV9740_MAX_WIDTH)
                *width = OV9740_MAX_WIDTH;

        if (*height > OV9740_MAX_HEIGHT)
                *height = OV9740_MAX_HEIGHT;
}

/* Setup registers according to resolution and color encoding */
static int ov9740_set_res(struct i2c_client *client, u32 width, u32 height)
{
        u32 x_start;
        u32 y_start;
        u32 x_end;
        u32 y_end;
        bool scaling = 0;
        u32 scale_input_x;
        u32 scale_input_y;
        int ret;

        if ((width != OV9740_MAX_WIDTH) || (height != OV9740_MAX_HEIGHT))
                scaling = 1;

        /*
         * Try to use as much of the sensor area as possible when supporting
         * smaller resolutions.  Depending on the aspect ratio of the
         * chosen resolution, we can either use the full width of the sensor,
         * or the full height of the sensor (or both if the aspect ratio is
         * the same as 1280x720.
         */
        if ((OV9740_MAX_WIDTH * height) > (OV9740_MAX_HEIGHT * width)) {
                scale_input_x = (OV9740_MAX_HEIGHT * width) / height;
                scale_input_y = OV9740_MAX_HEIGHT;
        } else {
                scale_input_x = OV9740_MAX_WIDTH;
                scale_input_y = (OV9740_MAX_WIDTH * height) / width;
        }

        /* These describe the area of the sensor to use. */
        x_start = (OV9740_MAX_WIDTH - scale_input_x) / 2;
        y_start = (OV9740_MAX_HEIGHT - scale_input_y) / 2;
        x_end = x_start + scale_input_x - 1;
        y_end = y_start + scale_input_y - 1;

        ret = ov9740_reg_write(client, OV9740_X_ADDR_START_HI, x_start >> 8);
        if (ret)
                goto done;
        ret = ov9740_reg_write(client, OV9740_X_ADDR_START_LO, x_start & 0xff);
        if (ret)
                goto done;
        ret = ov9740_reg_write(client, OV9740_Y_ADDR_START_HI, y_start >> 8);
        if (ret)
                goto done;
        ret = ov9740_reg_write(client, OV9740_Y_ADDR_START_LO, y_start & 0xff);
        if (ret)
                goto done;

        ret = ov9740_reg_write(client, OV9740_X_ADDR_END_HI, x_end >> 8);
        if (ret)
                goto done;
        ret = ov9740_reg_write(client, OV9740_X_ADDR_END_LO, x_end & 0xff);
        if (ret)
                goto done;
        ret = ov9740_reg_write(client, OV9740_Y_ADDR_END_HI, y_end >> 8);
        if (ret)
                goto done;
        ret = ov9740_reg_write(client, OV9740_Y_ADDR_END_LO, y_end & 0xff);
        if (ret)
                goto done;

        ret = ov9740_reg_write(client, OV9740_X_OUTPUT_SIZE_HI, width >> 8);
        if (ret)
                goto done;
        ret = ov9740_reg_write(client, OV9740_X_OUTPUT_SIZE_LO, width & 0xff);
        if (ret)
                goto done;
        ret = ov9740_reg_write(client, OV9740_Y_OUTPUT_SIZE_HI, height >> 8);
        if (ret)
                goto done;
        ret = ov9740_reg_write(client, OV9740_Y_OUTPUT_SIZE_LO, height & 0xff);
        if (ret)
                goto done;

        ret = ov9740_reg_write(client, OV9740_ISP_CTRL1E, scale_input_x >> 8);
        if (ret)
                goto done;
        ret = ov9740_reg_write(client, OV9740_ISP_CTRL1F, scale_input_x & 0xff);
        if (ret)
                goto done;
        ret = ov9740_reg_write(client, OV9740_ISP_CTRL20, scale_input_y >> 8);
        if (ret)
                goto done;
        ret = ov9740_reg_write(client, OV9740_ISP_CTRL21, scale_input_y & 0xff);
        if (ret)
                goto done;

        ret = ov9740_reg_write(client, OV9740_VFIFO_READ_START_HI,
                               (scale_input_x - width) >> 8);
        if (ret)
                goto done;
        ret = ov9740_reg_write(client, OV9740_VFIFO_READ_START_LO,
                               (scale_input_x - width) & 0xff);
        if (ret)
                goto done;

        ret = ov9740_reg_write(client, OV9740_ISP_CTRL00, 0xff);
        if (ret)
                goto done;
        ret = ov9740_reg_write(client, OV9740_ISP_CTRL01, 0xef |
                                                          (scaling << 4));
        if (ret)
                goto done;
        ret = ov9740_reg_write(client, OV9740_ISP_CTRL03, 0xff);

done:
        return ret;
}

/* set the format we will capture in */
static int ov9740_s_fmt(struct v4l2_subdev *sd,
                        struct v4l2_mbus_framefmt *mf)
{
        struct i2c_client *client = v4l2_get_subdevdata(sd);
        struct ov9740_priv *priv = to_ov9740(sd);
        enum v4l2_colorspace cspace;
        enum v4l2_mbus_pixelcode code = mf->code;
        int ret;

        ov9740_res_roundup(&mf->width, &mf->height);

        switch (code) {
        case V4L2_MBUS_FMT_YUYV8_2X8:
                cspace = V4L2_COLORSPACE_SRGB;
                break;
        default:
                return -EINVAL;
        }

        ret = ov9740_reg_write_array(client, ov9740_defaults,
                                     ARRAY_SIZE(ov9740_defaults));
        if (ret < 0)
                return ret;

        ret = ov9740_set_res(client, mf->width, mf->height);
        if (ret < 0)
                return ret;

        mf->code        = code;
        mf->colorspace  = cspace;

        memcpy(&priv->current_mf, mf, sizeof(struct v4l2_mbus_framefmt));

        return ret;
}

static int ov9740_try_fmt(struct v4l2_subdev *sd,
                          struct v4l2_mbus_framefmt *mf)
{
        ov9740_res_roundup(&mf->width, &mf->height);

        mf->field = V4L2_FIELD_NONE;
        mf->code = V4L2_MBUS_FMT_YUYV8_2X8;
        mf->colorspace = V4L2_COLORSPACE_SRGB;

        return 0;
}

static int ov9740_enum_fmt(struct v4l2_subdev *sd, unsigned int index,
                           enum v4l2_mbus_pixelcode *code)
{
        if (index >= ARRAY_SIZE(ov9740_codes))
                return -EINVAL;

        *code = ov9740_codes[index];

        return 0;
}

static int ov9740_cropcap(struct v4l2_subdev *sd, struct v4l2_cropcap *a)
{
        a->bounds.left          = 0;
        a->bounds.top           = 0;
        a->bounds.width         = OV9740_MAX_WIDTH;
        a->bounds.height        = OV9740_MAX_HEIGHT;
        a->defrect              = a->bounds;
        a->type                 = V4L2_BUF_TYPE_VIDEO_CAPTURE;
        a->pixelaspect.numerator        = 1;
        a->pixelaspect.denominator      = 1;

        return 0;
}

static int ov9740_g_crop(struct v4l2_subdev *sd, struct v4l2_crop *a)
{
        a->c.left               = 0;
        a->c.top                = 0;
        a->c.width              = OV9740_MAX_WIDTH;
        a->c.height             = OV9740_MAX_HEIGHT;
        a->type                 = V4L2_BUF_TYPE_VIDEO_CAPTURE;

        return 0;
}

/* Set status of additional camera capabilities */
static int ov9740_s_ctrl(struct v4l2_ctrl *ctrl)
{
        struct ov9740_priv *priv =
                container_of(ctrl->handler, struct ov9740_priv, hdl);

        switch (ctrl->id) {
        case V4L2_CID_VFLIP:
                priv->flag_vflip = ctrl->val;
                break;
        case V4L2_CID_HFLIP:
                priv->flag_hflip = ctrl->val;
                break;
        default:
                return -EINVAL;
        }

        return 0;
}

/* Get chip identification */
static int ov9740_g_chip_ident(struct v4l2_subdev *sd,
                               struct v4l2_dbg_chip_ident *id)
{
        struct ov9740_priv *priv = to_ov9740(sd);

        id->ident = priv->ident;
        id->revision = priv->revision;

        return 0;
}

static int ov9740_s_power(struct v4l2_subdev *sd, int on)
{
        struct ov9740_priv *priv = to_ov9740(sd);

        if (!priv->current_enable)
                return 0;

        if (on) {
                ov9740_s_fmt(sd, &priv->current_mf);
                ov9740_s_stream(sd, priv->current_enable);
        } else {
                ov9740_s_stream(sd, 0);
                priv->current_enable = true;
        }

        return 0;
}

#ifdef CONFIG_VIDEO_ADV_DEBUG
static int ov9740_get_register(struct v4l2_subdev *sd,
                               struct v4l2_dbg_register *reg)
{
        struct i2c_client *client = v4l2_get_subdevdata(sd);
        int ret;
        u8 val;

        if (reg->reg & ~0xffff)
                return -EINVAL;

        reg->size = 2;

        ret = ov9740_reg_read(client, reg->reg, &val);
        if (ret)
                return ret;

        reg->val = (__u64)val;

        return ret;
}

static int ov9740_set_register(struct v4l2_subdev *sd,
                               struct v4l2_dbg_register *reg)
{
        struct i2c_client *client = v4l2_get_subdevdata(sd);

        if (reg->reg & ~0xffff || reg->val & ~0xff)
                return -EINVAL;

        return ov9740_reg_write(client, reg->reg, reg->val);
}
#endif

static int ov9740_video_probe(struct i2c_client *client)
{
        struct v4l2_subdev *sd = i2c_get_clientdata(client);
        struct ov9740_priv *priv = to_ov9740(sd);
        u8 modelhi, modello;
        int ret;

        /*
         * check and show product ID and manufacturer ID
         */
        ret = ov9740_reg_read(client, OV9740_MODEL_ID_HI, &modelhi);
        if (ret < 0)
                goto err;

        ret = ov9740_reg_read(client, OV9740_MODEL_ID_LO, &modello);
        if (ret < 0)
                goto err;

        priv->model = (modelhi << 8) | modello;

        ret = ov9740_reg_read(client, OV9740_REVISION_NUMBER, &priv->revision);
        if (ret < 0)
                goto err;

        ret = ov9740_reg_read(client, OV9740_MANUFACTURER_ID, &priv->manid);
        if (ret < 0)
                goto err;

        ret = ov9740_reg_read(client, OV9740_SMIA_VERSION, &priv->smiaver);
        if (ret < 0)
                goto err;

        if (priv->model != 0x9740) {
                ret = -ENODEV;
                goto err;
        }

        priv->ident = V4L2_IDENT_OV9740;

        dev_info(&client->dev, "ov9740 Model ID 0x%04x, Revision 0x%02x, "
                 "Manufacturer 0x%02x, SMIA Version 0x%02x\n",
                 priv->model, priv->revision, priv->manid, priv->smiaver);

err:
        return ret;
}

/* Request bus settings on camera side */
static int ov9740_g_mbus_config(struct v4l2_subdev *sd,
                                struct v4l2_mbus_config *cfg)
{
        struct i2c_client *client = v4l2_get_subdevdata(sd);
        struct soc_camera_link *icl = soc_camera_i2c_to_link(client);

        cfg->flags = V4L2_MBUS_PCLK_SAMPLE_RISING | V4L2_MBUS_MASTER |
                V4L2_MBUS_VSYNC_ACTIVE_HIGH | V4L2_MBUS_HSYNC_ACTIVE_HIGH |
                V4L2_MBUS_DATA_ACTIVE_HIGH;
        cfg->type = V4L2_MBUS_PARALLEL;
        cfg->flags = soc_camera_apply_board_flags(icl, cfg);

        return 0;
}

static struct v4l2_subdev_video_ops ov9740_video_ops = {
        .s_stream       = ov9740_s_stream,
        .s_mbus_fmt     = ov9740_s_fmt,
        .try_mbus_fmt   = ov9740_try_fmt,
        .enum_mbus_fmt  = ov9740_enum_fmt,
        .cropcap        = ov9740_cropcap,
        .g_crop         = ov9740_g_crop,
        .g_mbus_config  = ov9740_g_mbus_config,
};

static struct v4l2_subdev_core_ops ov9740_core_ops = {
        .g_chip_ident           = ov9740_g_chip_ident,
        .s_power                = ov9740_s_power,
#ifdef CONFIG_VIDEO_ADV_DEBUG
        .g_register             = ov9740_get_register,
        .s_register             = ov9740_set_register,
#endif
};

static struct v4l2_subdev_ops ov9740_subdev_ops = {
        .core                   = &ov9740_core_ops,
        .video                  = &ov9740_video_ops,
};

static const struct v4l2_ctrl_ops ov9740_ctrl_ops = {
        .s_ctrl = ov9740_s_ctrl,
};

/*
 * i2c_driver function
 */
static int ov9740_probe(struct i2c_client *client,
                        const struct i2c_device_id *did)
{
        struct ov9740_priv *priv;
        struct soc_camera_link *icl = soc_camera_i2c_to_link(client);
        int ret;

        if (!icl) {
                dev_err(&client->dev, "Missing platform_data for driver\n");
                return -EINVAL;
        }

        priv = kzalloc(sizeof(struct ov9740_priv), GFP_KERNEL);
        if (!priv) {
                dev_err(&client->dev, "Failed to allocate private data!\n");
                return -ENOMEM;
        }

        v4l2_i2c_subdev_init(&priv->subdev, client, &ov9740_subdev_ops);
        v4l2_ctrl_handler_init(&priv->hdl, 13);
        v4l2_ctrl_new_std(&priv->hdl, &ov9740_ctrl_ops,
                        V4L2_CID_VFLIP, 0, 1, 1, 0);
        v4l2_ctrl_new_std(&priv->hdl, &ov9740_ctrl_ops,
                        V4L2_CID_HFLIP, 0, 1, 1, 0);
        priv->subdev.ctrl_handler = &priv->hdl;
        if (priv->hdl.error) {
                int err = priv->hdl.error;

                kfree(priv);
                return err;
        }

        ret = ov9740_video_probe(client);
        if (!ret)
                ret = v4l2_ctrl_handler_setup(&priv->hdl);
        if (ret < 0) {
                v4l2_ctrl_handler_free(&priv->hdl);
                kfree(priv);
        }

        return ret;
}

static int ov9740_remove(struct i2c_client *client)
{
        struct ov9740_priv *priv = i2c_get_clientdata(client);

        v4l2_device_unregister_subdev(&priv->subdev);
        v4l2_ctrl_handler_free(&priv->hdl);
        kfree(priv);
        return 0;
}

static const struct i2c_device_id ov9740_id[] = {
        { "ov9740", 0 },
        { }
};
MODULE_DEVICE_TABLE(i2c, ov9740_id);

static struct i2c_driver ov9740_i2c_driver = {
        .driver = {
                .name = "ov9740",
        },
        .probe    = ov9740_probe,
        .remove   = ov9740_remove,
        .id_table = ov9740_id,
};

static int __init ov9740_module_init(void)
{
        return i2c_add_driver(&ov9740_i2c_driver);
}

static void __exit ov9740_module_exit(void)
{
        i2c_del_driver(&ov9740_i2c_driver);
}

module_init(ov9740_module_init);
module_exit(ov9740_module_exit);

MODULE_DESCRIPTION("SoC Camera driver for OmniVision OV9740");
MODULE_AUTHOR("Andrew Chew <achew@nvidia.com>");
MODULE_LICENSE("GPL v2");