pms.c

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/*
 *  Media Vision Pro Movie Studio
 *          or
 *  "all you need is an I2C bus some RAM and a prayer"
 *
 *  This draws heavily on code
 *
 *  (c) Wolfgang Koehler,  [email protected], Dec. 1994
 *  Kiefernring 15
 *  14478 Potsdam, Germany
 *
 *  Most of this code is directly derived from his userspace driver.
 *  His driver works so send any reports to [email protected]
 *  unless the userspace driver also doesn't work for you...
 *
 *      Changes:
 *  25-11-2009  Hans Verkuil <[email protected]>
 *          - converted to version 2 of the V4L API.
 *      08/07/2003      Daniele Bellucci <[email protected]>
 *                      - pms_capture: report back -EFAULT
 */

#include <linux/module.h>
#include <linux/delay.h>
#include <linux/errno.h>
#include <linux/fs.h>
#include <linux/kernel.h>
#include <linux/mm.h>
#include <linux/slab.h>
#include <linux/ioport.h>
#include <linux/init.h>
#include <linux/mutex.h>
#include <linux/uaccess.h>
#include <linux/isa.h>
#include <asm/io.h>

#include <linux/videodev2.h>
#include <media/v4l2-common.h>
#include <media/v4l2-ioctl.h>
#include <media/v4l2-ctrls.h>
#include <media/v4l2-fh.h>
#include <media/v4l2-event.h>
#include <media/v4l2-device.h>

MODULE_LICENSE("GPL");
MODULE_VERSION("0.0.5");

#define MOTOROLA    1
#define PHILIPS2    2               /* SAA7191 */
#define PHILIPS1    3
#define MVVMEMORYWIDTH  0x40        /* 512 bytes */

struct i2c_info {
    u8 slave;
    u8 sub;
    u8 data;
    u8 hits;
};

struct pms {
    struct v4l2_device v4l2_dev;
    struct video_device vdev;
    struct v4l2_ctrl_handler hdl;
    int height;
    int width;
    int depth;
    int input;
    struct mutex lock;
    int i2c_count;
    struct i2c_info i2cinfo[64];

    int decoder;
    int standard;   /* 0 - auto 1 - ntsc 2 - pal 3 - secam */
    v4l2_std_id std;
    int io;
    int data;
    void __iomem *mem;
};

/*
 *  I/O ports and Shared Memory
 */

static int io_port = 0x250;
module_param(io_port, int, 0);

static int mem_base = 0xc8000;
module_param(mem_base, int, 0);

static int video_nr = -1;
module_param(video_nr, int, 0);


static inline void mvv_write(struct pms *dev, u8 index, u8 value)
{
    outw(index | (value << 8), dev->io);
}

static inline u8 mvv_read(struct pms *dev, u8 index)
{
    outb(index, dev->io);
    return inb(dev->data);
}

static int pms_i2c_stat(struct pms *dev, u8 slave)
{
    int counter = 0;
    int i;

    outb(0x28, dev->io);

    while ((inb(dev->data) & 0x01) == 0)
        if (counter++ == 256)
            break;

    while ((inb(dev->data) & 0x01) != 0)
        if (counter++ == 256)
            break;

    outb(slave, dev->io);

    counter = 0;
    while ((inb(dev->data) & 0x01) == 0)
        if (counter++ == 256)
            break;

    while ((inb(dev->data) & 0x01) != 0)
        if (counter++ == 256)
            break;

    for (i = 0; i < 12; i++) {
        char st = inb(dev->data);

        if ((st & 2) != 0)
            return -1;
        if ((st & 1) == 0)
            break;
    }
    outb(0x29, dev->io);
    return inb(dev->data);
}

static int pms_i2c_write(struct pms *dev, u16 slave, u16 sub, u16 data)
{
    int skip = 0;
    int count;
    int i;

    for (i = 0; i < dev->i2c_count; i++) {
        if ((dev->i2cinfo[i].slave == slave) &&
            (dev->i2cinfo[i].sub == sub)) {
            if (dev->i2cinfo[i].data == data)
                skip = 1;
            dev->i2cinfo[i].data = data;
            i = dev->i2c_count + 1;
        }
    }

    if (i == dev->i2c_count && dev->i2c_count < 64) {
        dev->i2cinfo[dev->i2c_count].slave = slave;
        dev->i2cinfo[dev->i2c_count].sub = sub;
        dev->i2cinfo[dev->i2c_count].data = data;
        dev->i2c_count++;
    }

    if (skip)
        return 0;

    mvv_write(dev, 0x29, sub);
    mvv_write(dev, 0x2A, data);
    mvv_write(dev, 0x28, slave);

    outb(0x28, dev->io);

    count = 0;
    while ((inb(dev->data) & 1) == 0)
        if (count > 255)
            break;
    while ((inb(dev->data) & 1) != 0)
        if (count > 255)
            break;

    count = inb(dev->data);

    if (count & 2)
        return -1;
    return count;
}

static int pms_i2c_read(struct pms *dev, int slave, int sub)
{
    int i;

    for (i = 0; i < dev->i2c_count; i++) {
        if (dev->i2cinfo[i].slave == slave && dev->i2cinfo[i].sub == sub)
            return dev->i2cinfo[i].data;
    }
    return 0;
}


static void pms_i2c_andor(struct pms *dev, int slave, int sub, int and, int or)
{
    u8 tmp;

    tmp = pms_i2c_read(dev, slave, sub);
    tmp = (tmp & and) | or;
    pms_i2c_write(dev, slave, sub, tmp);
}

/*
 *  Control functions
 */


static void pms_videosource(struct pms *dev, short source)
{
    switch (dev->decoder) {
    case MOTOROLA:
        break;
    case PHILIPS2:
        pms_i2c_andor(dev, 0x8a, 0x06, 0x7f, source ? 0x80 : 0);
        break;
    case PHILIPS1:
        break;
    }
    mvv_write(dev, 0x2E, 0x31);
    /* Was: mvv_write(dev, 0x2E, source ? 0x31 : 0x30);
       But could not make this work correctly. Only Composite input
       worked for me. */
}

static void pms_hue(struct pms *dev, short hue)
{
    switch (dev->decoder) {
    case MOTOROLA:
        pms_i2c_write(dev, 0x8a, 0x00, hue);
        break;
    case PHILIPS2:
        pms_i2c_write(dev, 0x8a, 0x07, hue);
        break;
    case PHILIPS1:
        pms_i2c_write(dev, 0x42, 0x07, hue);
        break;
    }
}

static void pms_saturation(struct pms *dev, short sat)
{
    switch (dev->decoder) {
    case MOTOROLA:
        pms_i2c_write(dev, 0x8a, 0x00, sat);
        break;
    case PHILIPS1:
        pms_i2c_write(dev, 0x42, 0x12, sat);
        break;
    }
}


static void pms_contrast(struct pms *dev, short contrast)
{
    switch (dev->decoder) {
    case MOTOROLA:
        pms_i2c_write(dev, 0x8a, 0x00, contrast);
        break;
    case PHILIPS1:
        pms_i2c_write(dev, 0x42, 0x13, contrast);
        break;
    }
}

static void pms_brightness(struct pms *dev, short brightness)
{
    switch (dev->decoder) {
    case MOTOROLA:
        pms_i2c_write(dev, 0x8a, 0x00, brightness);
        pms_i2c_write(dev, 0x8a, 0x00, brightness);
        pms_i2c_write(dev, 0x8a, 0x00, brightness);
        break;
    case PHILIPS1:
        pms_i2c_write(dev, 0x42, 0x19, brightness);
        break;
    }
}


static void pms_format(struct pms *dev, short format)
{
    int target;

    dev->standard = format;

    if (dev->decoder == PHILIPS1)
        target = 0x42;
    else if (dev->decoder == PHILIPS2)
        target = 0x8a;
    else
        return;

    switch (format) {
    case 0: /* Auto */
        pms_i2c_andor(dev, target, 0x0d, 0xfe, 0x00);
        pms_i2c_andor(dev, target, 0x0f, 0x3f, 0x80);
        break;
    case 1: /* NTSC */
        pms_i2c_andor(dev, target, 0x0d, 0xfe, 0x00);
        pms_i2c_andor(dev, target, 0x0f, 0x3f, 0x40);
        break;
    case 2: /* PAL */
        pms_i2c_andor(dev, target, 0x0d, 0xfe, 0x00);
        pms_i2c_andor(dev, target, 0x0f, 0x3f, 0x00);
        break;
    case 3: /* SECAM */
        pms_i2c_andor(dev, target, 0x0d, 0xfe, 0x01);
        pms_i2c_andor(dev, target, 0x0f, 0x3f, 0x00);
        break;
    }
}

#ifdef FOR_FUTURE_EXPANSION

/*
 *  These features of the PMS card are not currently exposes. They
 *  could become a private v4l ioctl for PMSCONFIG or somesuch if
 *  people need it. We also don't yet use the PMS interrupt.
 */

static void pms_hstart(struct pms *dev, short start)
{
    switch (dev->decoder) {
    case PHILIPS1:
        pms_i2c_write(dev, 0x8a, 0x05, start);
        pms_i2c_write(dev, 0x8a, 0x18, start);
        break;
    case PHILIPS2:
        pms_i2c_write(dev, 0x42, 0x05, start);
        pms_i2c_write(dev, 0x42, 0x18, start);
        break;
    }
}

/*
 *  Bandpass filters
 */

static void pms_bandpass(struct pms *dev, short pass)
{
    if (dev->decoder == PHILIPS2)
        pms_i2c_andor(dev, 0x8a, 0x06, 0xcf, (pass & 0x03) << 4);
    else if (dev->decoder == PHILIPS1)
        pms_i2c_andor(dev, 0x42, 0x06, 0xcf, (pass & 0x03) << 4);
}

static void pms_antisnow(struct pms *dev, short snow)
{
    if (dev->decoder == PHILIPS2)
        pms_i2c_andor(dev, 0x8a, 0x06, 0xf3, (snow & 0x03) << 2);
    else if (dev->decoder == PHILIPS1)
        pms_i2c_andor(dev, 0x42, 0x06, 0xf3, (snow & 0x03) << 2);
}

static void pms_sharpness(struct pms *dev, short sharp)
{
    if (dev->decoder == PHILIPS2)
        pms_i2c_andor(dev, 0x8a, 0x06, 0xfc, sharp & 0x03);
    else if (dev->decoder == PHILIPS1)
        pms_i2c_andor(dev, 0x42, 0x06, 0xfc, sharp & 0x03);
}

static void pms_chromaagc(struct pms *dev, short agc)
{
    if (dev->decoder == PHILIPS2)
        pms_i2c_andor(dev, 0x8a, 0x0c, 0x9f, (agc & 0x03) << 5);
    else if (dev->decoder == PHILIPS1)
        pms_i2c_andor(dev, 0x42, 0x0c, 0x9f, (agc & 0x03) << 5);
}

static void pms_vertnoise(struct pms *dev, short noise)
{
    if (dev->decoder == PHILIPS2)
        pms_i2c_andor(dev, 0x8a, 0x10, 0xfc, noise & 3);
    else if (dev->decoder == PHILIPS1)
        pms_i2c_andor(dev, 0x42, 0x10, 0xfc, noise & 3);
}

static void pms_forcecolour(struct pms *dev, short colour)
{
    if (dev->decoder == PHILIPS2)
        pms_i2c_andor(dev, 0x8a, 0x0c, 0x7f, (colour & 1) << 7);
    else if (dev->decoder == PHILIPS1)
        pms_i2c_andor(dev, 0x42, 0x0c, 0x7, (colour & 1) << 7);
}

static void pms_antigamma(struct pms *dev, short gamma)
{
    if (dev->decoder == PHILIPS2)
        pms_i2c_andor(dev, 0xb8, 0x00, 0x7f, (gamma & 1) << 7);
    else if (dev->decoder == PHILIPS1)
        pms_i2c_andor(dev, 0x42, 0x20, 0x7, (gamma & 1) << 7);
}

static void pms_prefilter(struct pms *dev, short filter)
{
    if (dev->decoder == PHILIPS2)
        pms_i2c_andor(dev, 0x8a, 0x06, 0xbf, (filter & 1) << 6);
    else if (dev->decoder == PHILIPS1)
        pms_i2c_andor(dev, 0x42, 0x06, 0xbf, (filter & 1) << 6);
}

static void pms_hfilter(struct pms *dev, short filter)
{
    if (dev->decoder == PHILIPS2)
        pms_i2c_andor(dev, 0xb8, 0x04, 0x1f, (filter & 7) << 5);
    else if (dev->decoder == PHILIPS1)
        pms_i2c_andor(dev, 0x42, 0x24, 0x1f, (filter & 7) << 5);
}

static void pms_vfilter(struct pms *dev, short filter)
{
    if (dev->decoder == PHILIPS2)
        pms_i2c_andor(dev, 0xb8, 0x08, 0x9f, (filter & 3) << 5);
    else if (dev->decoder == PHILIPS1)
        pms_i2c_andor(dev, 0x42, 0x28, 0x9f, (filter & 3) << 5);
}

static void pms_killcolour(struct pms *dev, short colour)
{
    if (dev->decoder == PHILIPS2) {
        pms_i2c_andor(dev, 0x8a, 0x08, 0x07, (colour & 0x1f) << 3);
        pms_i2c_andor(dev, 0x8a, 0x09, 0x07, (colour & 0x1f) << 3);
    } else if (dev->decoder == PHILIPS1) {
        pms_i2c_andor(dev, 0x42, 0x08, 0x07, (colour & 0x1f) << 3);
        pms_i2c_andor(dev, 0x42, 0x09, 0x07, (colour & 0x1f) << 3);
    }
}

static void pms_chromagain(struct pms *dev, short chroma)
{
    if (dev->decoder == PHILIPS2)
        pms_i2c_write(dev, 0x8a, 0x11, chroma);
    else if (dev->decoder == PHILIPS1)
        pms_i2c_write(dev, 0x42, 0x11, chroma);
}


static void pms_spacialcompl(struct pms *dev, short data)
{
    mvv_write(dev, 0x3b, data);
}

static void pms_spacialcomph(struct pms *dev, short data)
{
    mvv_write(dev, 0x3a, data);
}

static void pms_vstart(struct pms *dev, short start)
{
    mvv_write(dev, 0x16, start);
    mvv_write(dev, 0x17, (start >> 8) & 0x01);
}

#endif

static void pms_secamcross(struct pms *dev, short cross)
{
    if (dev->decoder == PHILIPS2)
        pms_i2c_andor(dev, 0x8a, 0x0f, 0xdf, (cross & 1) << 5);
    else if (dev->decoder == PHILIPS1)
        pms_i2c_andor(dev, 0x42, 0x0f, 0xdf, (cross & 1) << 5);
}


static void pms_swsense(struct pms *dev, short sense)
{
    if (dev->decoder == PHILIPS2) {
        pms_i2c_write(dev, 0x8a, 0x0a, sense);
        pms_i2c_write(dev, 0x8a, 0x0b, sense);
    } else if (dev->decoder == PHILIPS1) {
        pms_i2c_write(dev, 0x42, 0x0a, sense);
        pms_i2c_write(dev, 0x42, 0x0b, sense);
    }
}


static void pms_framerate(struct pms *dev, short frr)
{
    int fps = (dev->std & V4L2_STD_525_60) ? 30 : 25;

    if (frr == 0)
        return;
    fps = fps/frr;
    mvv_write(dev, 0x14, 0x80 | fps);
    mvv_write(dev, 0x15, 1);
}

static void pms_vert(struct pms *dev, u8 deciden, u8 decinum)
{
    mvv_write(dev, 0x1c, deciden);  /* Denominator */
    mvv_write(dev, 0x1d, decinum);  /* Numerator */
}

/*
 *  Turn 16bit ratios into best small ratio the chipset can grok
 */

static void pms_vertdeci(struct pms *dev, unsigned short decinum, unsigned short deciden)
{
    /* Knock it down by / 5 once */
    if (decinum % 5 == 0) {
        deciden /= 5;
        decinum /= 5;
    }
    /*
     *  3's
     */
    while (decinum % 3 == 0 && deciden % 3 == 0) {
        deciden /= 3;
        decinum /= 3;
    }
    /*
     *  2's
     */
    while (decinum % 2 == 0 && deciden % 2 == 0) {
        decinum /= 2;
        deciden /= 2;
    }
    /*
     *  Fudgyify
     */
    while (deciden > 32) {
        deciden /= 2;
        decinum = (decinum + 1) / 2;
    }
    if (deciden == 32)
        deciden--;
    pms_vert(dev, deciden, decinum);
}

static void pms_horzdeci(struct pms *dev, short decinum, short deciden)
{
    if (decinum <= 512) {
        if (decinum % 5 == 0) {
            decinum /= 5;
            deciden /= 5;
        }
    } else {
        decinum = 512;
        deciden = 640;  /* 768 would be ideal */
    }

    while (((decinum | deciden) & 1) == 0) {
        decinum >>= 1;
        deciden >>= 1;
    }
    while (deciden > 32) {
        deciden >>= 1;
        decinum = (decinum + 1) >> 1;
    }
    if (deciden == 32)
        deciden--;

    mvv_write(dev, 0x24, 0x80 | deciden);
    mvv_write(dev, 0x25, decinum);
}

static void pms_resolution(struct pms *dev, short width, short height)
{
    int fg_height;

    fg_height = height;
    if (fg_height > 280)
        fg_height = 280;

    mvv_write(dev, 0x18, fg_height);
    mvv_write(dev, 0x19, fg_height >> 8);

    if (dev->std & V4L2_STD_525_60) {
        mvv_write(dev, 0x1a, 0xfc);
        mvv_write(dev, 0x1b, 0x00);
        if (height > fg_height)
            pms_vertdeci(dev, 240, 240);
        else
            pms_vertdeci(dev, fg_height, 240);
    } else {
        mvv_write(dev, 0x1a, 0x1a);
        mvv_write(dev, 0x1b, 0x01);
        if (fg_height > 256)
            pms_vertdeci(dev, 270, 270);
        else
            pms_vertdeci(dev, fg_height, 270);
    }
    mvv_write(dev, 0x12, 0);
    mvv_write(dev, 0x13, MVVMEMORYWIDTH);
    mvv_write(dev, 0x42, 0x00);
    mvv_write(dev, 0x43, 0x00);
    mvv_write(dev, 0x44, MVVMEMORYWIDTH);

    mvv_write(dev, 0x22, width + 8);
    mvv_write(dev, 0x23, (width + 8) >> 8);

    if (dev->std & V4L2_STD_525_60)
        pms_horzdeci(dev, width, 640);
    else
        pms_horzdeci(dev, width + 8, 768);

    mvv_write(dev, 0x30, mvv_read(dev, 0x30) & 0xfe);
    mvv_write(dev, 0x08, mvv_read(dev, 0x08) | 0x01);
    mvv_write(dev, 0x01, mvv_read(dev, 0x01) & 0xfd);
    mvv_write(dev, 0x32, 0x00);
    mvv_write(dev, 0x33, MVVMEMORYWIDTH);
}


/*
 *  Set Input
 */

static void pms_vcrinput(struct pms *dev, short input)
{
    if (dev->decoder == PHILIPS2)
        pms_i2c_andor(dev, 0x8a, 0x0d, 0x7f, (input & 1) << 7);
    else if (dev->decoder == PHILIPS1)
        pms_i2c_andor(dev, 0x42, 0x0d, 0x7f, (input & 1) << 7);
}


static int pms_capture(struct pms *dev, char __user *buf, int rgb555, int count)
{
    int y;
    int dw = 2 * dev->width;
    char tmp[dw + 32]; /* using a temp buffer is faster than direct  */
    int cnt = 0;
    int len = 0;
    unsigned char r8 = 0x5;  /* value for reg8  */

    if (rgb555)
        r8 |= 0x20; /* else use untranslated rgb = 565 */
    mvv_write(dev, 0x08, r8); /* capture rgb555/565, init DRAM, PC enable */

/*  printf("%d %d %d %d %d %x %x\n",width,height,voff,nom,den,mvv_buf); */

    for (y = 0; y < dev->height; y++) {
        writeb(0, dev->mem);  /* synchronisiert neue Zeile */

        /*
         *  This is in truth a fifo, be very careful as if you
         *  forgot this odd things will occur 8)
         */

        memcpy_fromio(tmp, dev->mem, dw + 32); /* discard 16 word   */
        cnt -= dev->height;
        while (cnt <= 0) {
            /*
             *  Don't copy too far
             */
            int dt = dw;
            if (dt + len > count)
                dt = count - len;
            cnt += dev->height;
            if (copy_to_user(buf, tmp + 32, dt))
                return len ? len : -EFAULT;
            buf += dt;
            len += dt;
        }
    }
    return len;
}


/*
 *  Video4linux interfacing
 */

static int pms_querycap(struct file *file, void  *priv,
                    struct v4l2_capability *vcap)
{
    struct pms *dev = video_drvdata(file);

    strlcpy(vcap->driver, dev->v4l2_dev.name, sizeof(vcap->driver));
    strlcpy(vcap->card, "Mediavision PMS", sizeof(vcap->card));
    snprintf(vcap->bus_info, sizeof(vcap->bus_info),
            "ISA:%s", dev->v4l2_dev.name);
    vcap->device_caps = V4L2_CAP_VIDEO_CAPTURE | V4L2_CAP_READWRITE;
    vcap->capabilities = vcap->device_caps | V4L2_CAP_DEVICE_CAPS;
    return 0;
}

static int pms_enum_input(struct file *file, void *fh, struct v4l2_input *vin)
{
    static const char *inputs[4] = {
        "Composite",
        "S-Video",
        "Composite (VCR)",
        "S-Video (VCR)"
    };

    if (vin->index > 3)
        return -EINVAL;
    strlcpy(vin->name, inputs[vin->index], 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 pms_g_input(struct file *file, void *fh, unsigned int *inp)
{
    struct pms *dev = video_drvdata(file);

    *inp = dev->input;
    return 0;
}

static int pms_s_input(struct file *file, void *fh, unsigned int inp)
{
    struct pms *dev = video_drvdata(file);

    if (inp > 3)
        return -EINVAL;

    dev->input = inp;
    pms_videosource(dev, inp & 1);
    pms_vcrinput(dev, inp >> 1);
    return 0;
}

static int pms_g_std(struct file *file, void *fh, v4l2_std_id *std)
{
    struct pms *dev = video_drvdata(file);

    *std = dev->std;
    return 0;
}

static int pms_s_std(struct file *file, void *fh, v4l2_std_id *std)
{
    struct pms *dev = video_drvdata(file);
    int ret = 0;

    dev->std = *std;
    if (dev->std & V4L2_STD_NTSC) {
        pms_framerate(dev, 30);
        pms_secamcross(dev, 0);
        pms_format(dev, 1);
    } else if (dev->std & V4L2_STD_PAL) {
        pms_framerate(dev, 25);
        pms_secamcross(dev, 0);
        pms_format(dev, 2);
    } else if (dev->std & V4L2_STD_SECAM) {
        pms_framerate(dev, 25);
        pms_secamcross(dev, 1);
        pms_format(dev, 2);
    } else {
        ret = -EINVAL;
    }
    /*
    switch (v->mode) {
    case VIDEO_MODE_AUTO:
        pms_framerate(dev, 25);
        pms_secamcross(dev, 0);
        pms_format(dev, 0);
        break;
    }*/
    return ret;
}

static int pms_s_ctrl(struct v4l2_ctrl *ctrl)
{
    struct pms *dev = container_of(ctrl->handler, struct pms, hdl);
    int ret = 0;

    switch (ctrl->id) {
    case V4L2_CID_BRIGHTNESS:
        pms_brightness(dev, ctrl->val);
        break;
    case V4L2_CID_CONTRAST:
        pms_contrast(dev, ctrl->val);
        break;
    case V4L2_CID_SATURATION:
        pms_saturation(dev, ctrl->val);
        break;
    case V4L2_CID_HUE:
        pms_hue(dev, ctrl->val);
        break;
    default:
        ret = -EINVAL;
        break;
    }
    return ret;
}

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

    pix->width = dev->width;
    pix->height = dev->height;
    pix->pixelformat = dev->width == 15 ?
                V4L2_PIX_FMT_RGB555 : V4L2_PIX_FMT_RGB565;
    pix->field = V4L2_FIELD_NONE;
    pix->bytesperline = 2 * dev->width;
    pix->sizeimage = 2 * dev->width * dev->height;
    /* Just a guess */
    pix->colorspace = V4L2_COLORSPACE_SRGB;
    return 0;
}

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

    if (pix->height < 16 || pix->height > 480)
        return -EINVAL;
    if (pix->width < 16 || pix->width > 640)
        return -EINVAL;
    if (pix->pixelformat != V4L2_PIX_FMT_RGB555 &&
        pix->pixelformat != V4L2_PIX_FMT_RGB565)
        return -EINVAL;
    pix->field = V4L2_FIELD_NONE;
    pix->bytesperline = 2 * pix->width;
    pix->sizeimage = 2 * pix->width * pix->height;
    /* Just a guess */
    pix->colorspace = V4L2_COLORSPACE_SRGB;
    return 0;
}

static int pms_s_fmt_vid_cap(struct file *file, void *fh, struct v4l2_format *fmt)
{
    struct pms *dev = video_drvdata(file);
    struct v4l2_pix_format *pix = &fmt->fmt.pix;
    int ret = pms_try_fmt_vid_cap(file, fh, fmt);

    if (ret)
        return ret;
    dev->width = pix->width;
    dev->height = pix->height;
    dev->depth = (pix->pixelformat == V4L2_PIX_FMT_RGB555) ? 15 : 16;
    pms_resolution(dev, dev->width, dev->height);
    /* Ok we figured out what to use from our wide choice */
    return 0;
}

static int pms_enum_fmt_vid_cap(struct file *file, void *fh, struct v4l2_fmtdesc *fmt)
{
    static struct v4l2_fmtdesc formats[] = {
        { 0, 0, 0,
          "RGB 5:5:5", V4L2_PIX_FMT_RGB555,
          { 0, 0, 0, 0 }
        },
        { 1, 0, 0,
          "RGB 5:6:5", V4L2_PIX_FMT_RGB565,
          { 0, 0, 0, 0 }
        },
    };
    enum v4l2_buf_type type = fmt->type;

    if (fmt->index > 1)
        return -EINVAL;

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

static ssize_t pms_read(struct file *file, char __user *buf,
            size_t count, loff_t *ppos)
{
    struct pms *dev = video_drvdata(file);
    int len;

    len = pms_capture(dev, buf, (dev->depth == 15), count);
    return len;
}

static unsigned int pms_poll(struct file *file, struct poll_table_struct *wait)
{
    struct v4l2_fh *fh = file->private_data;
    unsigned int res = POLLIN | POLLRDNORM;

    if (v4l2_event_pending(fh))
        res |= POLLPRI;
    poll_wait(file, &fh->wait, wait);
    return res;
}

static const struct v4l2_file_operations pms_fops = {
    .owner      = THIS_MODULE,
    .open           = v4l2_fh_open,
    .release        = v4l2_fh_release,
    .poll           = pms_poll,
    .unlocked_ioctl = video_ioctl2,
    .read           = pms_read,
};

static const struct v4l2_ioctl_ops pms_ioctl_ops = {
    .vidioc_querycap        = pms_querycap,
    .vidioc_g_input         = pms_g_input,
    .vidioc_s_input         = pms_s_input,
    .vidioc_enum_input      = pms_enum_input,
    .vidioc_g_std           = pms_g_std,
    .vidioc_s_std           = pms_s_std,
    .vidioc_enum_fmt_vid_cap    = pms_enum_fmt_vid_cap,
    .vidioc_g_fmt_vid_cap       = pms_g_fmt_vid_cap,
    .vidioc_s_fmt_vid_cap       = pms_s_fmt_vid_cap,
    .vidioc_try_fmt_vid_cap     = pms_try_fmt_vid_cap,
    .vidioc_subscribe_event     = v4l2_ctrl_subscribe_event,
    .vidioc_unsubscribe_event   = v4l2_event_unsubscribe,
};

/*
 *  Probe for and initialise the Mediavision PMS
 */

static int init_mediavision(struct pms *dev)
{
    int idec, decst;
    int i;
    static const unsigned char i2c_defs[] = {
        0x4c, 0x30, 0x00, 0xe8,
        0xb6, 0xe2, 0x00, 0x00,
        0xff, 0xff, 0x00, 0x00,
        0x00, 0x00, 0x78, 0x98,
        0x00, 0x00, 0x00, 0x00,
        0x34, 0x0a, 0xf4, 0xce,
        0xe4
    };

    dev->mem = ioremap(mem_base, 0x800);
    if (!dev->mem)
        return -ENOMEM;

    if (!request_region(0x9a01, 1, "Mediavision PMS config")) {
        printk(KERN_WARNING "mediavision: unable to detect: 0x9a01 in use.\n");
        iounmap(dev->mem);
        return -EBUSY;
    }
    if (!request_region(dev->io, 3, "Mediavision PMS")) {
        printk(KERN_WARNING "mediavision: I/O port %d in use.\n", dev->io);
        release_region(0x9a01, 1);
        iounmap(dev->mem);
        return -EBUSY;
    }
    outb(0xb8, 0x9a01);     /* Unlock */
    outb(dev->io >> 4, 0x9a01); /* Set IO port */


    decst = pms_i2c_stat(dev, 0x43);

    if (decst != -1)
        idec = 2;
    else if (pms_i2c_stat(dev, 0xb9) != -1)
        idec = 3;
    else if (pms_i2c_stat(dev, 0x8b) != -1)
        idec = 1;
    else
        idec = 0;

    printk(KERN_INFO "PMS type is %d\n", idec);
    if (idec == 0) {
        release_region(dev->io, 3);
        release_region(0x9a01, 1);
        iounmap(dev->mem);
        return -ENODEV;
    }

    /*
     *  Ok we have a PMS of some sort
     */

    mvv_write(dev, 0x04, mem_base >> 12);   /* Set the memory area */

    /* Ok now load the defaults */

    for (i = 0; i < 0x19; i++) {
        if (i2c_defs[i] == 0xff)
            pms_i2c_andor(dev, 0x8a, i, 0x07, 0x00);
        else
            pms_i2c_write(dev, 0x8a, i, i2c_defs[i]);
    }

    pms_i2c_write(dev, 0xb8, 0x00, 0x12);
    pms_i2c_write(dev, 0xb8, 0x04, 0x00);
    pms_i2c_write(dev, 0xb8, 0x07, 0x00);
    pms_i2c_write(dev, 0xb8, 0x08, 0x00);
    pms_i2c_write(dev, 0xb8, 0x09, 0xff);
    pms_i2c_write(dev, 0xb8, 0x0a, 0x00);
    pms_i2c_write(dev, 0xb8, 0x0b, 0x10);
    pms_i2c_write(dev, 0xb8, 0x10, 0x03);

    mvv_write(dev, 0x01, 0x00);
    mvv_write(dev, 0x05, 0xa0);
    mvv_write(dev, 0x08, 0x25);
    mvv_write(dev, 0x09, 0x00);
    mvv_write(dev, 0x0a, 0x20 | MVVMEMORYWIDTH);

    mvv_write(dev, 0x10, 0x02);
    mvv_write(dev, 0x1e, 0x0c);
    mvv_write(dev, 0x1f, 0x03);
    mvv_write(dev, 0x26, 0x06);

    mvv_write(dev, 0x2b, 0x00);
    mvv_write(dev, 0x2c, 0x20);
    mvv_write(dev, 0x2d, 0x00);
    mvv_write(dev, 0x2f, 0x70);
    mvv_write(dev, 0x32, 0x00);
    mvv_write(dev, 0x33, MVVMEMORYWIDTH);
    mvv_write(dev, 0x34, 0x00);
    mvv_write(dev, 0x35, 0x00);
    mvv_write(dev, 0x3a, 0x80);
    mvv_write(dev, 0x3b, 0x10);
    mvv_write(dev, 0x20, 0x00);
    mvv_write(dev, 0x21, 0x00);
    mvv_write(dev, 0x30, 0x22);
    return 0;
}

/*
 *  Initialization and module stuff
 */

#ifndef MODULE
static int enable;
module_param(enable, int, 0);
#endif

static const struct v4l2_ctrl_ops pms_ctrl_ops = {
    .s_ctrl = pms_s_ctrl,
};

static int pms_probe(struct device *pdev, unsigned int card)
{
    struct pms *dev;
    struct v4l2_device *v4l2_dev;
    struct v4l2_ctrl_handler *hdl;
    int res;

#ifndef MODULE
    if (!enable) {
        pr_err("PMS: not enabled, use pms.enable=1 to probe\n");
        return -ENODEV;
    }
#endif

    dev = kzalloc(sizeof(*dev), GFP_KERNEL);
    if (dev == NULL)
        return -ENOMEM;

    dev->decoder = PHILIPS2;
    dev->io = io_port;
    dev->data = io_port + 1;
    v4l2_dev = &dev->v4l2_dev;
    hdl = &dev->hdl;

    res = v4l2_device_register(pdev, v4l2_dev);
    if (res < 0) {
        v4l2_err(v4l2_dev, "Could not register v4l2_device\n");
        goto free_dev;
    }
    v4l2_info(v4l2_dev, "Mediavision Pro Movie Studio driver 0.05\n");

    res = init_mediavision(dev);
    if (res) {
        v4l2_err(v4l2_dev, "Board not found.\n");
        goto free_io;
    }

    v4l2_ctrl_handler_init(hdl, 4);
    v4l2_ctrl_new_std(hdl, &pms_ctrl_ops,
            V4L2_CID_BRIGHTNESS, 0, 255, 1, 139);
    v4l2_ctrl_new_std(hdl, &pms_ctrl_ops,
            V4L2_CID_CONTRAST, 0, 255, 1, 70);
    v4l2_ctrl_new_std(hdl, &pms_ctrl_ops,
            V4L2_CID_SATURATION, 0, 255, 1, 64);
    v4l2_ctrl_new_std(hdl, &pms_ctrl_ops,
            V4L2_CID_HUE, 0, 255, 1, 0);
    if (hdl->error) {
        res = hdl->error;
        goto free_hdl;
    }

    mutex_init(&dev->lock);
    strlcpy(dev->vdev.name, v4l2_dev->name, sizeof(dev->vdev.name));
    dev->vdev.v4l2_dev = v4l2_dev;
    dev->vdev.ctrl_handler = hdl;
    dev->vdev.fops = &pms_fops;
    dev->vdev.ioctl_ops = &pms_ioctl_ops;
    dev->vdev.release = video_device_release_empty;
    dev->vdev.lock = &dev->lock;
    dev->vdev.tvnorms = V4L2_STD_NTSC | V4L2_STD_PAL | V4L2_STD_SECAM;
    set_bit(V4L2_FL_USE_FH_PRIO, &dev->vdev.flags);
    video_set_drvdata(&dev->vdev, dev);
    dev->std = V4L2_STD_NTSC_M;
    dev->height = 240;
    dev->width = 320;
    dev->depth = 16;
    pms_swsense(dev, 75);
    pms_resolution(dev, 320, 240);
    pms_videosource(dev, 0);
    pms_vcrinput(dev, 0);
    v4l2_ctrl_handler_setup(hdl);
    res = video_register_device(&dev->vdev, VFL_TYPE_GRABBER, video_nr);
    if (res >= 0)
        return 0;

free_hdl:
    v4l2_ctrl_handler_free(hdl);
    v4l2_device_unregister(&dev->v4l2_dev);
free_io:
    release_region(dev->io, 3);
    release_region(0x9a01, 1);
    iounmap(dev->mem);
free_dev:
    kfree(dev);
    return res;
}

static int pms_remove(struct device *pdev, unsigned int card)
{
    struct pms *dev = dev_get_drvdata(pdev);

    video_unregister_device(&dev->vdev);
    v4l2_ctrl_handler_free(&dev->hdl);
    release_region(dev->io, 3);
    release_region(0x9a01, 1);
    iounmap(dev->mem);
    return 0;
}

static struct isa_driver pms_driver = {
    .probe      = pms_probe,
    .remove     = pms_remove,
    .driver     = {
        .name   = "pms",
    },
};

static int __init pms_init(void)
{
    return isa_register_driver(&pms_driver, 1);
}

static void __exit pms_exit(void)
{
    isa_unregister_driver(&pms_driver);
}

module_init(pms_init);
module_exit(pms_exit);