/*
 *      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,  wolf@first.gmd.de, 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 alan@lxorguk.ukuu.org.uk
 *      unless the userspace driver also doesn't work for you...
 *
 *      Changes:
 *      25-11-2009      Hans Verkuil <hverkuil@xs4all.nl>
 *                      - converted to version 2 of the V4L API.
 *      08/07/2003      Daniele Bellucci <bellucda@tiscali.it>
 *                      - 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);