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/*
    bttv - Bt848 frame grabber driver
    vbi interface
   
    (c) 2002 Gerd Knorr <kraxel@bytesex.org>
   
    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.
   
    This program is distributed in the hope that it will be useful,
    but WITHOUT ANY WARRANTY; without even the implied warranty of
    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
    GNU General Public License for more details.
   
    You should have received a copy of the GNU General Public License
    along with this program; if not, write to the Free Software
    Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
*/

#include <linuxcomp.h>

#include <linux/module.h>
#include <linux/errno.h>
#include <linux/fs.h>
#include <linux/kernel.h>
#include <linux/sched.h>
#include <linux/interrupt.h>
#include <linux/kdev_t.h>
#include <asm/io.h>
#include "drivers/bttvp.h"

#define VBI_DEFLINES 16
#define VBI_MAXLINES 32

static unsigned int vbibufs = 4;
static unsigned int vbi_debug = 0;

MODULE_PARM(vbibufs,"i");
MODULE_PARM_DESC(vbibufs,"number of vbi buffers, range 2-32, default 4");
MODULE_PARM(vbi_debug,"i");
MODULE_PARM_DESC(vbi_debug,"vbi code debug messages, default is 0 (no)");

#ifdef dprintk
# undef dprintk
#endif
#define dprintk(fmt, arg...)    if (vbi_debug) \
        printk(KERN_DEBUG "bttv%d/vbi: " fmt, btv->nr, ## arg)

/* ----------------------------------------------------------------------- */
/* vbi risc code + mm                                                      */

static int
vbi_buffer_risc(struct bttv *btv, struct bttv_buffer *buf, int lines)
{
        int bpl = 2048;

        bttv_risc_packed(btv, &buf->top, buf->vb.dma.sglist,
                         0, bpl-4, 4, lines);
        bttv_risc_packed(btv, &buf->bottom, buf->vb.dma.sglist,
                         lines * bpl, bpl-4, 4, lines);
        return 0;
}

static int vbi_buffer_setup(struct file *file,
                            unsigned int *count, unsigned int *size)
{
        struct bttv_fh *fh = file->private_data;
        struct bttv *btv = fh->btv;

        if (0 == *count)
                *count = vbibufs;
        *size = fh->lines * 2 * 2048;
        dprintk("setup: lines=%d\n",fh->lines);
        return 0;
}

static int vbi_buffer_prepare(struct file *file, struct videobuf_buffer *vb,
                              enum v4l2_field field)
{
        struct bttv_fh *fh = file->private_data;
        struct bttv *btv = fh->btv;
        struct bttv_buffer *buf = (struct bttv_buffer*)vb;
        int rc;
       
        buf->vb.size = fh->lines * 2 * 2048;
        if (0 != buf->vb.baddr  &&  buf->vb.bsize < buf->vb.size)
                return -EINVAL;

        if (STATE_NEEDS_INIT == buf->vb.state) {
                if (0 != (rc = videobuf_iolock(btv->dev, &buf->vb, NULL)))
                        goto fail;
                if (0 != (rc = vbi_buffer_risc(btv,buf,fh->lines)))
                        goto fail;
        }
        buf->vb.state = STATE_PREPARED;
        buf->vb.field = field;
        dprintk("buf prepare %p: top=%p bottom=%p field=%s\n",
                vb, &buf->top, &buf->bottom,
                v4l2_field_names[buf->vb.field]);
        return 0;

 fail:
        bttv_dma_free(btv,buf);
        return rc;
}

static void
vbi_buffer_queue(struct file *file, struct videobuf_buffer *vb)
{
        struct bttv_fh *fh = file->private_data;
        struct bttv *btv = fh->btv;
        struct bttv_buffer *buf = (struct bttv_buffer*)vb;
       
        dprintk("queue %p\n",vb);
        buf->vb.state = STATE_QUEUED;
        list_add_tail(&buf->vb.queue,&btv->vcapture);
        bttv_set_dma(btv,0x0c,1);
}

static void vbi_buffer_release(struct file *file, struct videobuf_buffer *vb)
{
        struct bttv_fh *fh = file->private_data;
        struct bttv *btv = fh->btv;
        struct bttv_buffer *buf = (struct bttv_buffer*)vb;
       
        dprintk("free %p\n",vb);
        bttv_dma_free(fh->btv,buf);
}

struct videobuf_queue_ops bttv_vbi_qops = {
        .buf_setup    = vbi_buffer_setup,
        .buf_prepare  = vbi_buffer_prepare,
        .buf_queue    = vbi_buffer_queue,
        .buf_release  = vbi_buffer_release,
};

/* ----------------------------------------------------------------------- */

void bttv_vbi_setlines(struct bttv_fh *fh, struct bttv *btv, int lines)
{
        int vdelay;

        if (lines < 1)
                lines = 1;
        if (lines > VBI_MAXLINES)
                lines = VBI_MAXLINES;
        fh->lines = lines;

        vdelay = btread(BT848_E_VDELAY_LO);
        if (vdelay < lines*2) {
                vdelay = lines*2;
                btwrite(vdelay,BT848_E_VDELAY_LO);
                btwrite(vdelay,BT848_O_VDELAY_LO);
        }
}

void bttv_vbi_try_fmt(struct bttv_fh *fh, struct v4l2_format *f)
{
        const struct bttv_tvnorm *tvnorm;
        u32 start0,start1;
        s32 count0,count1,count;

        tvnorm = &bttv_tvnorms[fh->btv->tvnorm];
        f->type = V4L2_BUF_TYPE_VBI_CAPTURE;
        f->fmt.vbi.sampling_rate    = tvnorm->Fsc;
        f->fmt.vbi.samples_per_line = 2048;
        f->fmt.vbi.sample_format    = V4L2_PIX_FMT_GREY;
        f->fmt.vbi.offset           = 244;
        f->fmt.vbi.flags            = 0;
        switch (fh->btv->tvnorm) {
        case 1: /* NTSC */
                start0 = 10;
                start1 = 273;
                break;
        case 0: /* PAL */
        case 2: /* SECAM */
        default:
                start0 = 7;
                start1 = 319;
        }

        count0 = (f->fmt.vbi.start[0] + f->fmt.vbi.count[0]) - start0;
        count1 = (f->fmt.vbi.start[1] + f->fmt.vbi.count[1]) - start1;
        count  = max(count0,count1);
        if (count > VBI_MAXLINES)
                count = VBI_MAXLINES;
        if (count < 1)
                count = 1;

        f->fmt.vbi.start[0] = start0;
        f->fmt.vbi.start[1] = start1;
        f->fmt.vbi.count[0] = count;
        f->fmt.vbi.count[1] = count;
}

void bttv_vbi_get_fmt(struct bttv_fh *fh, struct v4l2_format *f)
{
        const struct bttv_tvnorm *tvnorm;

        tvnorm = &bttv_tvnorms[fh->btv->tvnorm];
        memset(f,0,sizeof(*f));
        f->type = V4L2_BUF_TYPE_VBI_CAPTURE;
        f->fmt.vbi.sampling_rate    = tvnorm->Fsc;
        f->fmt.vbi.samples_per_line = 2048;
        f->fmt.vbi.sample_format    = V4L2_PIX_FMT_GREY;
        f->fmt.vbi.offset           = 244;
        f->fmt.vbi.count[0]         = fh->lines;
        f->fmt.vbi.count[1]         = fh->lines;
        f->fmt.vbi.flags            = 0;
        switch (fh->btv->tvnorm) {
        case 1: /* NTSC */
                f->fmt.vbi.start[0] = 10;
                f->fmt.vbi.start[1] = 273;
                break;
        case 0: /* PAL */
        case 2: /* SECAM */
        default:
                f->fmt.vbi.start[0] = 7;
                f->fmt.vbi.start[1] = 319;
        }
}

/* ----------------------------------------------------------------------- */
/*
 * Local variables:
 * c-basic-offset: 8
 * End:
 */