/*
 * Colour AR M64278(VGA) driver for Video4Linux
 *
 * Copyright (C) 2003   Takeo Takahashi <takahashi.takeo@renesas.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.
 *
 * Some code is taken from AR driver sample program for M3T-M32700UT.
 *
 * AR driver sample (M32R SDK):
 *     Copyright (c) 2003 RENESAS TECHNOROGY CORPORATION
 *     AND RENESAS SOLUTIONS CORPORATION
 *     All Rights Reserved.
 *
 * 2003-09-01:  Support w3cam by Takeo Takahashi
 */

#include <linux/init.h>
#include <linux/module.h>
#include <linux/delay.h>
#include <linux/errno.h>
#include <linux/fs.h>
#include <linux/kernel.h>
#include <linux/slab.h>
#include <linux/mm.h>
#include <linux/sched.h>
#include <linux/videodev2.h>
#include <media/v4l2-common.h>
#include <media/v4l2-device.h>
#include <media/v4l2-ioctl.h>
#include <linux/mutex.h>

#include <asm/uaccess.h>
#include <asm/m32r.h>
#include <asm/io.h>
#include <asm/dma.h>
#include <asm/byteorder.h>

#if 0
#define DEBUG(n, args...) printk(KERN_INFO args)
#define CHECK_LOST      1
#else
#define DEBUG(n, args...)
#define CHECK_LOST      0
#endif

/*
 * USE_INT is always 0, interrupt mode is not available
 * on linux due to lack of speed
 */
#define USE_INT         0       /* Don't modify */

#define VERSION "0.0.5"

#define ar_inl(addr)            inl((unsigned long)(addr))
#define ar_outl(val, addr)      outl((unsigned long)(val), (unsigned long)(addr))

extern struct cpuinfo_m32r      boot_cpu_data;

/*
 * CCD pixel size
 *      Note that M32700UT does not support CIF mode, but QVGA is
 *      supported by M32700UT hardware using VGA mode of AR LSI.
 *
 *      Supported: VGA  (Normal mode, Interlace mode)
 *                 QVGA (Always Interlace mode of VGA)
 *
 */
#define AR_WIDTH_VGA            640
#define AR_HEIGHT_VGA           480
#define AR_WIDTH_QVGA           320
#define AR_HEIGHT_QVGA          240
#define MIN_AR_WIDTH            AR_WIDTH_QVGA
#define MIN_AR_HEIGHT           AR_HEIGHT_QVGA
#define MAX_AR_WIDTH            AR_WIDTH_VGA
#define MAX_AR_HEIGHT           AR_HEIGHT_VGA

/* bits & bytes per pixel */
#define AR_BITS_PER_PIXEL       16
#define AR_BYTES_PER_PIXEL      (AR_BITS_PER_PIXEL / 8)

/* line buffer size */
#define AR_LINE_BYTES_VGA       (AR_WIDTH_VGA * AR_BYTES_PER_PIXEL)
#define AR_LINE_BYTES_QVGA      (AR_WIDTH_QVGA * AR_BYTES_PER_PIXEL)
#define MAX_AR_LINE_BYTES       AR_LINE_BYTES_VGA

/* frame size & type */
#define AR_FRAME_BYTES_VGA \
        (AR_WIDTH_VGA * AR_HEIGHT_VGA * AR_BYTES_PER_PIXEL)
#define AR_FRAME_BYTES_QVGA \
        (AR_WIDTH_QVGA * AR_HEIGHT_QVGA * AR_BYTES_PER_PIXEL)
#define MAX_AR_FRAME_BYTES \
        (MAX_AR_WIDTH * MAX_AR_HEIGHT * AR_BYTES_PER_PIXEL)

#define AR_MAX_FRAME            15

/* capture size */
#define AR_SIZE_VGA             0
#define AR_SIZE_QVGA            1

/* capture mode */
#define AR_MODE_INTERLACE       0
#define AR_MODE_NORMAL          1

struct ar {
        struct v4l2_device v4l2_dev;
        struct video_device vdev;
        unsigned int start_capture;     /* duaring capture in INT. mode. */
#if USE_INT
        unsigned char *line_buff;       /* DMA line buffer */
#endif
        unsigned char *frame[MAX_AR_HEIGHT];    /* frame data */
        short size;                     /* capture size */
        short mode;                     /* capture mode */
        int width, height;
        int frame_bytes, line_bytes;
        wait_queue_head_t wait;
        struct mutex lock;
};

static struct ar ardev;

static int video_nr = -1;       /* video device number (first free) */
static unsigned char yuv[MAX_AR_FRAME_BYTES];

/* module parameters */
/* default frequency */
#define DEFAULT_FREQ    50      /* 50 or 75 (MHz) is available as BCLK */
static int freq = DEFAULT_FREQ; /* BCLK: available 50 or 70 (MHz) */
static int vga;                 /* default mode(0:QVGA mode, other:VGA mode) */
static int vga_interlace;       /* 0 is normal mode for, else interlace mode */
module_param(freq, int, 0);
module_param(vga, int, 0);
module_param(vga_interlace, int, 0);

static void wait_for_vsync(void)
{
        while (ar_inl(ARVCR0) & ARVCR0_VDS)     /* wait for VSYNC */
                cpu_relax();
        while (!(ar_inl(ARVCR0) & ARVCR0_VDS))  /* wait for VSYNC */
                cpu_relax();
}

static void wait_acknowledge(void)
{
        int i;

        for (i = 0; i < 1000; i++)
                cpu_relax();
        while (ar_inl(PLDI2CSTS) & PLDI2CSTS_NOACK)
                cpu_relax();
}

/*******************************************************************
 * I2C functions
 *******************************************************************/
static void iic(int n, unsigned long addr, unsigned long data1, unsigned long data2,
         unsigned long data3)
{
        int i;

        /* Slave Address */
        ar_outl(addr, PLDI2CDATA);
        wait_for_vsync();

        /* Start */
        ar_outl(1, PLDI2CCND);
        wait_acknowledge();

        /* Transfer data 1 */
        ar_outl(data1, PLDI2CDATA);
        wait_for_vsync();
        ar_outl(PLDI2CSTEN_STEN, PLDI2CSTEN);
        wait_acknowledge();

        /* Transfer data 2 */
        ar_outl(data2, PLDI2CDATA);
        wait_for_vsync();
        ar_outl(PLDI2CSTEN_STEN, PLDI2CSTEN);
        wait_acknowledge();

        if (n == 3) {
                /* Transfer data 3 */
                ar_outl(data3, PLDI2CDATA);
                wait_for_vsync();
                ar_outl(PLDI2CSTEN_STEN, PLDI2CSTEN);
                wait_acknowledge();
        }

        /* Stop */
        for (i = 0; i < 100; i++)
                cpu_relax();
        ar_outl(2, PLDI2CCND);
        ar_outl(2, PLDI2CCND);

        while (ar_inl(PLDI2CSTS) & PLDI2CSTS_BB)
                cpu_relax();
}


static void init_iic(void)
{
        DEBUG(1, "init_iic:\n");

        /*
         * ICU Setting (iic)
         */
        /* I2C Setting */
        ar_outl(0x0, PLDI2CCR);         /* I2CCR Disable                   */
        ar_outl(0x0300, PLDI2CMOD);     /* I2CMOD ACK/8b-data/7b-addr/auto */
        ar_outl(0x1, PLDI2CACK);        /* I2CACK ACK                      */

        /* I2C CLK */
        /* 50MH-100k */
        if (freq == 75)
                ar_outl(369, PLDI2CFREQ);       /* BCLK = 75MHz */
        else if (freq == 50)
                ar_outl(244, PLDI2CFREQ);       /* BCLK = 50MHz */
        else
                ar_outl(244, PLDI2CFREQ);       /* default: BCLK = 50MHz */
        ar_outl(0x1, PLDI2CCR);         /* I2CCR Enable */
}

/**************************************************************************
 *
 * Video4Linux Interface functions
 *
 **************************************************************************/

static inline void disable_dma(void)
{
        ar_outl(0x8000, M32R_DMAEN_PORTL);      /* disable DMA0 */
}

static inline void enable_dma(void)
{
        ar_outl(0x8080, M32R_DMAEN_PORTL);      /* enable DMA0 */
}

static inline void clear_dma_status(void)
{
        ar_outl(0x8000, M32R_DMAEDET_PORTL);    /* clear status */
}

static void wait_for_vertical_sync(struct ar *ar, int exp_line)
{
#if CHECK_LOST
        int tmout = 10000;      /* FIXME */
        int l;

        /*
         * check HCOUNT because we cannot check vertical sync.
         */
        for (; tmout >= 0; tmout--) {
                l = ar_inl(ARVHCOUNT);
                if (l == exp_line)
                        break;
        }
        if (tmout < 0)
                v4l2_err(&ar->v4l2_dev, "lost %d -> %d\n", exp_line, l);
#else
        while (ar_inl(ARVHCOUNT) != exp_line)
                cpu_relax();
#endif
}

static ssize_t ar_read(struct file *file, char *buf, size_t count, loff_t *ppos)
{
        struct ar *ar = video_drvdata(file);
        long ret = ar->frame_bytes;             /* return read bytes */
        unsigned long arvcr1 = 0;
        unsigned long flags;
        unsigned char *p;
        int h, w;
        unsigned char *py, *pu, *pv;
#if !USE_INT
        int l;
#endif

        DEBUG(1, "ar_read()\n");

        if (ar->size == AR_SIZE_QVGA)
                arvcr1 |= ARVCR1_QVGA;
        if (ar->mode == AR_MODE_NORMAL)
                arvcr1 |= ARVCR1_NORMAL;

        mutex_lock(&ar->lock);

#if USE_INT
        local_irq_save(flags);
        disable_dma();
        ar_outl(0xa1871300, M32R_DMA0CR0_PORTL);
        ar_outl(0x01000000, M32R_DMA0CR1_PORTL);

        /* set AR FIFO address as source(BSEL5) */
        ar_outl(ARDATA32, M32R_DMA0CSA_PORTL);
        ar_outl(ARDATA32, M32R_DMA0RSA_PORTL);
        ar_outl(ar->line_buff, M32R_DMA0CDA_PORTL);     /* destination addr. */
        ar_outl(ar->line_buff, M32R_DMA0RDA_PORTL);     /* reload address */
        ar_outl(ar->line_bytes, M32R_DMA0CBCUT_PORTL);  /* byte count (bytes) */
        ar_outl(ar->line_bytes, M32R_DMA0RBCUT_PORTL);  /* reload count (bytes) */

        /*
         * Okay, kick AR LSI to invoke an interrupt
         */
        ar->start_capture = 0;
        ar_outl(arvcr1 | ARVCR1_HIEN, ARVCR1);
        local_irq_restore(flags);
        /* .... AR interrupts .... */
        interruptible_sleep_on(&ar->wait);
        if (signal_pending(current)) {
                printk(KERN_ERR "arv: interrupted while get frame data.\n");
                ret = -EINTR;
                goto out_up;
        }
#else   /* ! USE_INT */
        /* polling */
        ar_outl(arvcr1, ARVCR1);
        disable_dma();
        ar_outl(0x8000, M32R_DMAEDET_PORTL);
        ar_outl(0xa0861300, M32R_DMA0CR0_PORTL);
        ar_outl(0x01000000, M32R_DMA0CR1_PORTL);
        ar_outl(ARDATA32, M32R_DMA0CSA_PORTL);
        ar_outl(ARDATA32, M32R_DMA0RSA_PORTL);
        ar_outl(ar->line_bytes, M32R_DMA0CBCUT_PORTL);
        ar_outl(ar->line_bytes, M32R_DMA0RBCUT_PORTL);

        local_irq_save(flags);
        while (ar_inl(ARVHCOUNT) != 0)          /* wait for 0 */
                cpu_relax();
        if (ar->mode == AR_MODE_INTERLACE && ar->size == AR_SIZE_VGA) {
                for (h = 0; h < ar->height; h++) {
                        wait_for_vertical_sync(ar, h);
                        if (h < (AR_HEIGHT_VGA/2))
                                l = h << 1;
                        else
                                l = (((h - (AR_HEIGHT_VGA/2)) << 1) + 1);
                        ar_outl(virt_to_phys(ar->frame[l]), M32R_DMA0CDA_PORTL);
                        enable_dma();
                        while (!(ar_inl(M32R_DMAEDET_PORTL) & 0x8000))
                                cpu_relax();
                        disable_dma();
                        clear_dma_status();
                        ar_outl(0xa0861300, M32R_DMA0CR0_PORTL);
                }
        } else {
                for (h = 0; h < ar->height; h++) {
                        wait_for_vertical_sync(ar, h);
                        ar_outl(virt_to_phys(ar->frame[h]), M32R_DMA0CDA_PORTL);
                        enable_dma();
                        while (!(ar_inl(M32R_DMAEDET_PORTL) & 0x8000))
                                cpu_relax();
                        disable_dma();
                        clear_dma_status();
                        ar_outl(0xa0861300, M32R_DMA0CR0_PORTL);
                }
        }
        local_irq_restore(flags);
#endif  /* ! USE_INT */

        /*
         * convert YUV422 to YUV422P
         *      +--------------------+
         *      |  Y0,Y1,...         |
         *      |  ..............Yn  |
         *      +--------------------+
         *      |  U0,U1,........Un  |
         *      +--------------------+
         *      |  V0,V1,........Vn  |
         *      +--------------------+
         */
        py = yuv;
        pu = py + (ar->frame_bytes / 2);
        pv = pu + (ar->frame_bytes / 4);
        for (h = 0; h < ar->height; h++) {
                p = ar->frame[h];
                for (w = 0; w < ar->line_bytes; w += 4) {
                        *py++ = *p++;
                        *pu++ = *p++;
                        *py++ = *p++;
                        *pv++ = *p++;
                }
        }
        if (copy_to_user(buf, yuv, ar->frame_bytes)) {
                v4l2_err(&ar->v4l2_dev, "failed while copy_to_user yuv.\n");
                ret = -EFAULT;
                goto out_up;
        }
        DEBUG(1, "ret = %d\n", ret);
out_up:
        mutex_unlock(&ar->lock);
        return ret;
}

static int ar_querycap(struct file *file, void  *priv,
                                        struct v4l2_capability *vcap)
{
        struct ar *ar = video_drvdata(file);

        strlcpy(vcap->driver, ar->vdev.name, sizeof(vcap->driver));
        strlcpy(vcap->card, "Colour AR VGA", sizeof(vcap->card));
        strlcpy(vcap->bus_info, "Platform", sizeof(vcap->bus_info));
        vcap->capabilities = V4L2_CAP_VIDEO_CAPTURE | V4L2_CAP_READWRITE;
        return 0;
}

static int ar_enum_input(struct file *file, void *fh, struct v4l2_input *vin)
{
        if (vin->index > 0)
                return -EINVAL;
        strlcpy(vin->name, "Camera", sizeof(vin->name));
        vin->type = V4L2_INPUT_TYPE_CAMERA;
        vin->audioset = 0;
        vin->tuner = 0;
        vin->std = V4L2_STD_ALL;
        vin->status = 0;
        return 0;
}

static int ar_g_input(struct file *file, void *fh, unsigned int *inp)
{
        *inp = 0;
        return 0;
}

static int ar_s_input(struct file *file, void *fh, unsigned int inp)
{
        return inp ? -EINVAL : 0;
}

static int ar_g_fmt_vid_cap(struct file *file, void *fh, struct v4l2_format *fmt)
{
        struct ar *ar = video_drvdata(file);
        struct v4l2_pix_format *pix = &fmt->fmt.pix;

        pix->width = ar->width;
        pix->height = ar->height;
        pix->pixelformat = V4L2_PIX_FMT_YUV422P;
        pix->field = (ar->mode == AR_MODE_NORMAL) ? V4L2_FIELD_NONE : V4L2_FIELD_INTERLACED;
        pix->bytesperline = ar->width;
        pix->sizeimage = 2 * ar->width * ar->height;
        /* Just a guess */
        pix->colorspace = V4L2_COLORSPACE_SMPTE170M;
        return 0;
}

static int ar_try_fmt_vid_cap(struct file *file, void *fh, struct v4l2_format *fmt)
{
        struct ar *ar = video_drvdata(file);
        struct v4l2_pix_format *pix = &fmt->fmt.pix;

        if (pix->height <= AR_HEIGHT_QVGA || pix->width <= AR_WIDTH_QVGA) {
                pix->height = AR_HEIGHT_QVGA;
                pix->width = AR_WIDTH_QVGA;
                pix->field = V4L2_FIELD_INTERLACED;
        } else {
                pix->height = AR_HEIGHT_VGA;
                pix->width = AR_WIDTH_VGA;
                pix->field = vga_interlace ? V4L2_FIELD_INTERLACED : V4L2_FIELD_NONE;
        }
        pix->pixelformat = V4L2_PIX_FMT_YUV422P;
        pix->bytesperline = ar->width;
        pix->sizeimage = 2 * ar->width * ar->height;
        /* Just a guess */
        pix->colorspace = V4L2_COLORSPACE_SMPTE170M;
        return 0;
}

static int ar_s_fmt_vid_cap(struct file *file, void *fh, struct v4l2_format *fmt)
{
        struct ar *ar = video_drvdata(file);
        struct v4l2_pix_format *pix = &fmt->fmt.pix;
        int ret = ar_try_fmt_vid_cap(file, fh, fmt);

        if (ret)
                return ret;
        mutex_lock(&ar->lock);
        ar->width = pix->width;
        ar->height = pix->height;
        if (ar->width == AR_WIDTH_VGA) {
                ar->size = AR_SIZE_VGA;
                ar->frame_bytes = AR_FRAME_BYTES_VGA;
                ar->line_bytes = AR_LINE_BYTES_VGA;
                if (vga_interlace)
                        ar->mode = AR_MODE_INTERLACE;
                else
                        ar->mode = AR_MODE_NORMAL;
        } else {
                ar->size = AR_SIZE_QVGA;
                ar->frame_bytes = AR_FRAME_BYTES_QVGA;
                ar->line_bytes = AR_LINE_BYTES_QVGA;
                ar->mode = AR_MODE_INTERLACE;
        }
        /* Ok we figured out what to use from our wide choice */
        mutex_unlock(&ar->lock);
        return 0;
}

static int ar_enum_fmt_vid_cap(struct file *file, void *fh, struct v4l2_fmtdesc *fmt)
{
        static struct v4l2_fmtdesc formats[] = {
                { 0, 0, 0,
                  "YUV 4:2:2 Planar", V4L2_PIX_FMT_YUV422P,
                  { 0, 0, 0, 0 }
                },
        };
        enum v4l2_buf_type type = fmt->type;

        if (fmt->index > 0)
                return -EINVAL;

        *fmt = formats[fmt->index];
        fmt->type = type;
        return 0;
}

#if USE_INT
/*
 * Interrupt handler
 */
static void ar_interrupt(int irq, void *dev)
{
        struct ar *ar = dev;
        unsigned int line_count;
        unsigned int line_number;
        unsigned int arvcr1;

        line_count = ar_inl(ARVHCOUNT);                 /* line number */
        if (ar->mode == AR_MODE_INTERLACE && ar->size == AR_SIZE_VGA) {
                /* operations for interlace mode */
                if (line_count < (AR_HEIGHT_VGA / 2))   /* even line */
                        line_number = (line_count << 1);
                else                                    /* odd line */
                        line_number =
                        (((line_count - (AR_HEIGHT_VGA / 2)) << 1) + 1);
        } else {
                line_number = line_count;
        }

        if (line_number == 0) {
                /*
                 * It is an interrupt for line 0.
                 * we have to start capture.
                 */
                disable_dma();
#if 0
                ar_outl(ar->line_buff, M32R_DMA0CDA_PORTL);     /* needless? */
#endif
                memcpy(ar->frame[0], ar->line_buff, ar->line_bytes);
#if 0
                ar_outl(0xa1861300, M32R_DMA0CR0_PORTL);
#endif
                enable_dma();
                ar->start_capture = 1;                  /* during capture */
                return;
        }

        if (ar->start_capture == 1 && line_number <= (ar->height - 1)) {
                disable_dma();
                memcpy(ar->frame[line_number], ar->line_buff, ar->line_bytes);

                /*
                 * if captured all line of a frame, disable AR interrupt
                 * and wake a process up.
                 */
                if (line_number == (ar->height - 1)) {  /* end  of line */

                        ar->start_capture = 0;

                        /* disable AR interrupt request */
                        arvcr1 = ar_inl(ARVCR1);
                        arvcr1 &= ~ARVCR1_HIEN;         /* clear int. flag */
                        ar_outl(arvcr1, ARVCR1);        /* disable */
                        wake_up_interruptible(&ar->wait);
                } else {
#if 0
                        ar_outl(ar->line_buff, M32R_DMA0CDA_PORTL);
                        ar_outl(0xa1861300, M32R_DMA0CR0_PORTL);
#endif
                        enable_dma();
                }
        }
}
#endif

/*
 * ar_initialize()
 *      ar_initialize() is called by video_register_device() and
 *      initializes AR LSI and peripherals.
 *
 *      -1 is returned in all failures.
 *      0 is returned in success.
 *
 */
static int ar_initialize(struct ar *ar)
{
        unsigned long cr = 0;
        int i, found = 0;

        DEBUG(1, "ar_initialize:\n");

        /*
         * initialize AR LSI
         */
        ar_outl(0, ARVCR0);             /* assert reset of AR LSI */
        for (i = 0; i < 0x18; i++)      /* wait for over 10 cycles @ 27MHz */
                cpu_relax();
        ar_outl(ARVCR0_RST, ARVCR0);    /* negate reset of AR LSI (enable) */
        for (i = 0; i < 0x40d; i++)     /* wait for over 420 cycles @ 27MHz */
                cpu_relax();

        /* AR uses INT3 of CPU as interrupt pin. */
        ar_outl(ARINTSEL_INT3, ARINTSEL);

        if (ar->size == AR_SIZE_QVGA)
                cr |= ARVCR1_QVGA;
        if (ar->mode == AR_MODE_NORMAL)
                cr |= ARVCR1_NORMAL;
        ar_outl(cr, ARVCR1);

        /*
         * Initialize IIC so that CPU can communicate with AR LSI,
         * and send boot commands to AR LSI.
         */
        init_iic();

        for (i = 0; i < 0x100000; i++) {        /* > 0xa1d10,  56ms */
                if ((ar_inl(ARVCR0) & ARVCR0_VDS)) {    /* VSYNC */
                        found = 1;
                        break;
                }
        }

        if (found == 0)
                return -ENODEV;

        v4l2_info(&ar->v4l2_dev, "Initializing ");

        iic(2, 0x78, 0x11, 0x01, 0x00); /* start */
        iic(3, 0x78, 0x12, 0x00, 0x06);
        iic(3, 0x78, 0x12, 0x12, 0x30);
        iic(3, 0x78, 0x12, 0x15, 0x58);
        iic(3, 0x78, 0x12, 0x17, 0x30);
        printk(KERN_CONT ".");
        iic(3, 0x78, 0x12, 0x1a, 0x97);
        iic(3, 0x78, 0x12, 0x1b, 0xff);
        iic(3, 0x78, 0x12, 0x1c, 0xff);
        iic(3, 0x78, 0x12, 0x26, 0x10);
        iic(3, 0x78, 0x12, 0x27, 0x00);
        printk(KERN_CONT ".");
        iic(2, 0x78, 0x34, 0x02, 0x00);
        iic(2, 0x78, 0x7a, 0x10, 0x00);
        iic(2, 0x78, 0x80, 0x39, 0x00);
        iic(2, 0x78, 0x81, 0xe6, 0x00);
        iic(2, 0x78, 0x8d, 0x00, 0x00);
        printk(KERN_CONT ".");
        iic(2, 0x78, 0x8e, 0x0c, 0x00);
        iic(2, 0x78, 0x8f, 0x00, 0x00);
#if 0
        iic(2, 0x78, 0x90, 0x00, 0x00); /* AWB on=1 off=0 */
#endif
        iic(2, 0x78, 0x93, 0x01, 0x00);
        iic(2, 0x78, 0x94, 0xcd, 0x00);
        iic(2, 0x78, 0x95, 0x00, 0x00);
        printk(KERN_CONT ".");
        iic(2, 0x78, 0x96, 0xa0, 0x00);
        iic(2, 0x78, 0x97, 0x00, 0x00);
        iic(2, 0x78, 0x98, 0x60, 0x00);
        iic(2, 0x78, 0x99, 0x01, 0x00);
        iic(2, 0x78, 0x9a, 0x19, 0x00);
        printk(KERN_CONT ".");
        iic(2, 0x78, 0x9b, 0x02, 0x00);
        iic(2, 0x78, 0x9c, 0xe8, 0x00);
        iic(2, 0x78, 0x9d, 0x02, 0x00);
        iic(2, 0x78, 0x9e, 0x2e, 0x00);
        iic(2, 0x78, 0xb8, 0x78, 0x00);
        iic(2, 0x78, 0xba, 0x05, 0x00);
#if 0
        iic(2, 0x78, 0x83, 0x8c, 0x00); /* brightness */
#endif
        printk(KERN_CONT ".");

        /* color correction */
        iic(3, 0x78, 0x49, 0x00, 0x95); /* a            */
        iic(3, 0x78, 0x49, 0x01, 0x96); /* b            */
        iic(3, 0x78, 0x49, 0x03, 0x85); /* c            */
        iic(3, 0x78, 0x49, 0x04, 0x97); /* d            */
        iic(3, 0x78, 0x49, 0x02, 0x7e); /* e(Lo)        */
        iic(3, 0x78, 0x49, 0x05, 0xa4); /* f(Lo)        */
        iic(3, 0x78, 0x49, 0x06, 0x04); /* e(Hi)        */
        iic(3, 0x78, 0x49, 0x07, 0x04); /* e(Hi)        */
        iic(2, 0x78, 0x48, 0x01, 0x00); /* on=1 off=0   */

        printk(KERN_CONT ".");
        iic(2, 0x78, 0x11, 0x00, 0x00); /* end */
        printk(KERN_CONT " done\n");
        return 0;
}


/****************************************************************************
 *
 * Video4Linux Module functions
 *
 ****************************************************************************/

static const struct v4l2_file_operations ar_fops = {
        .owner          = THIS_MODULE,
        .read           = ar_read,
        .unlocked_ioctl = video_ioctl2,
};

static const struct v4l2_ioctl_ops ar_ioctl_ops = {
        .vidioc_querycap                    = ar_querycap,
        .vidioc_g_input                     = ar_g_input,
        .vidioc_s_input                     = ar_s_input,
        .vidioc_enum_input                  = ar_enum_input,
        .vidioc_enum_fmt_vid_cap            = ar_enum_fmt_vid_cap,
        .vidioc_g_fmt_vid_cap               = ar_g_fmt_vid_cap,
        .vidioc_s_fmt_vid_cap               = ar_s_fmt_vid_cap,
        .vidioc_try_fmt_vid_cap             = ar_try_fmt_vid_cap,
};

#define ALIGN4(x)       ((((int)(x)) & 0x3) == 0)

static int __init ar_init(void)
{
        struct ar *ar;
        struct v4l2_device *v4l2_dev;
        int ret;
        int i;

        ar = &ardev;
        v4l2_dev = &ar->v4l2_dev;
        strlcpy(v4l2_dev->name, "arv", sizeof(v4l2_dev->name));
        v4l2_info(v4l2_dev, "Colour AR VGA driver %s\n", VERSION);

        ret = v4l2_device_register(NULL, v4l2_dev);
        if (ret < 0) {
                v4l2_err(v4l2_dev, "Could not register v4l2_device\n");
                return ret;
        }
        ret = -EIO;

#if USE_INT
        /* allocate a DMA buffer for 1 line.  */
        ar->line_buff = kmalloc(MAX_AR_LINE_BYTES, GFP_KERNEL | GFP_DMA);
        if (ar->line_buff == NULL || !ALIGN4(ar->line_buff)) {
                v4l2_err(v4l2_dev, "buffer allocation failed for DMA.\n");
                ret = -ENOMEM;
                goto out_end;
        }
#endif
        /* allocate buffers for a frame */
        for (i = 0; i < MAX_AR_HEIGHT; i++) {
                ar->frame[i] = kmalloc(MAX_AR_LINE_BYTES, GFP_KERNEL);
                if (ar->frame[i] == NULL || !ALIGN4(ar->frame[i])) {
                        v4l2_err(v4l2_dev, "buffer allocation failed for frame.\n");
                        ret = -ENOMEM;
                        goto out_line_buff;
                }
        }

        strlcpy(ar->vdev.name, "Colour AR VGA", sizeof(ar->vdev.name));
        ar->vdev.v4l2_dev = v4l2_dev;
        ar->vdev.fops = &ar_fops;
        ar->vdev.ioctl_ops = &ar_ioctl_ops;
        ar->vdev.release = video_device_release_empty;
        video_set_drvdata(&ar->vdev, ar);

        if (vga) {
                ar->width       = AR_WIDTH_VGA;
                ar->height      = AR_HEIGHT_VGA;
                ar->size        = AR_SIZE_VGA;
                ar->frame_bytes = AR_FRAME_BYTES_VGA;
                ar->line_bytes  = AR_LINE_BYTES_VGA;
                if (vga_interlace)
                        ar->mode = AR_MODE_INTERLACE;
                else
                        ar->mode = AR_MODE_NORMAL;
        } else {
                ar->width       = AR_WIDTH_QVGA;
                ar->height      = AR_HEIGHT_QVGA;
                ar->size        = AR_SIZE_QVGA;
                ar->frame_bytes = AR_FRAME_BYTES_QVGA;
                ar->line_bytes  = AR_LINE_BYTES_QVGA;
                ar->mode        = AR_MODE_INTERLACE;
        }
        mutex_init(&ar->lock);
        init_waitqueue_head(&ar->wait);

#if USE_INT
        if (request_irq(M32R_IRQ_INT3, ar_interrupt, 0, "arv", ar)) {
                v4l2_err("request_irq(%d) failed.\n", M32R_IRQ_INT3);
                ret = -EIO;
                goto out_irq;
        }
#endif

        if (ar_initialize(ar) != 0) {
                v4l2_err(v4l2_dev, "M64278 not found.\n");
                ret = -ENODEV;
                goto out_dev;
        }

        /*
         * ok, we can initialize h/w according to parameters,
         * so register video device as a frame grabber type.
         * device is named "video[0-64]".
         * video_register_device() initializes h/w using ar_initialize().
         */
        if (video_register_device(&ar->vdev, VFL_TYPE_GRABBER, video_nr) != 0) {
                /* return -1, -ENFILE(full) or others */
                v4l2_err(v4l2_dev, "register video (Colour AR) failed.\n");
                ret = -ENODEV;
                goto out_dev;
        }

        v4l2_info(v4l2_dev, "%s: Found M64278 VGA (IRQ %d, Freq %dMHz).\n",
                video_device_node_name(&ar->vdev), M32R_IRQ_INT3, freq);

        return 0;

out_dev:
#if USE_INT
        free_irq(M32R_IRQ_INT3, ar);

out_irq:
#endif
        for (i = 0; i < MAX_AR_HEIGHT; i++)
                kfree(ar->frame[i]);

out_line_buff:
#if USE_INT
        kfree(ar->line_buff);

out_end:
#endif
        v4l2_device_unregister(&ar->v4l2_dev);
        return ret;
}


static int __init ar_init_module(void)
{
        freq = (boot_cpu_data.bus_clock / 1000000);
        printk(KERN_INFO "arv: Bus clock %d\n", freq);
        if (freq != 50 && freq != 75)
                freq = DEFAULT_FREQ;
        return ar_init();
}

static void __exit ar_cleanup_module(void)
{
        struct ar *ar;
        int i;

        ar = &ardev;
        video_unregister_device(&ar->vdev);
#if USE_INT
        free_irq(M32R_IRQ_INT3, ar);
#endif
        for (i = 0; i < MAX_AR_HEIGHT; i++)
                kfree(ar->frame[i]);
#if USE_INT
        kfree(ar->line_buff);
#endif
        v4l2_device_unregister(&ar->v4l2_dev);
}

module_init(ar_init_module);
module_exit(ar_cleanup_module);

MODULE_AUTHOR("Takeo Takahashi <takahashi.takeo@renesas.com>");
MODULE_DESCRIPTION("Colour AR M64278(VGA) for Video4Linux");
MODULE_LICENSE("GPL");
MODULE_VERSION(VERSION);