227 lines
6.5 KiB
C
227 lines
6.5 KiB
C
/*
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bttv - Bt848 frame grabber driver
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vbi interface
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(c) 2002 Gerd Knorr <kraxel@bytesex.org>
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This program is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 2 of the License, or
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(at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program; if not, write to the Free Software
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Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
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*/
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#include <linux/module.h>
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#include <linux/moduleparam.h>
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#include <linux/errno.h>
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#include <linux/fs.h>
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#include <linux/kernel.h>
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#include <linux/sched.h>
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#include <linux/interrupt.h>
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#include <linux/kdev_t.h>
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#include <asm/io.h>
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#include "bttvp.h"
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/* Offset from line sync pulse leading edge (0H) to start of VBI capture,
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in fCLKx2 pixels. According to the datasheet, VBI capture starts
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VBI_HDELAY fCLKx1 pixels from the tailing edgeof /HRESET, and /HRESET
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is 64 fCLKx1 pixels wide. VBI_HDELAY is set to 0, so this should be
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(64 + 0) * 2 = 128 fCLKx2 pixels. But it's not! The datasheet is
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Just Plain Wrong. The real value appears to be different for
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different revisions of the bt8x8 chips, and to be affected by the
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horizontal scaling factor. Experimentally, the value is measured
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to be about 244. */
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#define VBI_OFFSET 244
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#define VBI_DEFLINES 16
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#define VBI_MAXLINES 32
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static unsigned int vbibufs = 4;
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static unsigned int vbi_debug = 0;
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module_param(vbibufs, int, 0444);
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module_param(vbi_debug, int, 0644);
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MODULE_PARM_DESC(vbibufs,"number of vbi buffers, range 2-32, default 4");
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MODULE_PARM_DESC(vbi_debug,"vbi code debug messages, default is 0 (no)");
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#ifdef dprintk
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# undef dprintk
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#endif
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#define dprintk(fmt, arg...) if (vbi_debug) \
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printk(KERN_DEBUG "bttv%d/vbi: " fmt, btv->c.nr , ## arg)
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/* ----------------------------------------------------------------------- */
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/* vbi risc code + mm */
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static int
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vbi_buffer_risc(struct bttv *btv, struct bttv_buffer *buf, int lines)
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{
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int bpl = 2048;
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bttv_risc_packed(btv, &buf->top, buf->vb.dma.sglist,
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0, bpl-4, 4, lines);
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bttv_risc_packed(btv, &buf->bottom, buf->vb.dma.sglist,
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lines * bpl, bpl-4, 4, lines);
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return 0;
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}
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static int vbi_buffer_setup(struct videobuf_queue *q,
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unsigned int *count, unsigned int *size)
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{
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struct bttv_fh *fh = q->priv_data;
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struct bttv *btv = fh->btv;
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if (0 == *count)
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*count = vbibufs;
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*size = fh->lines * 2 * 2048;
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dprintk("setup: lines=%d\n",fh->lines);
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return 0;
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}
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static int vbi_buffer_prepare(struct videobuf_queue *q,
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struct videobuf_buffer *vb,
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enum v4l2_field field)
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{
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struct bttv_fh *fh = q->priv_data;
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struct bttv *btv = fh->btv;
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struct bttv_buffer *buf = container_of(vb,struct bttv_buffer,vb);
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int rc;
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buf->vb.size = fh->lines * 2 * 2048;
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if (0 != buf->vb.baddr && buf->vb.bsize < buf->vb.size)
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return -EINVAL;
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if (STATE_NEEDS_INIT == buf->vb.state) {
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if (0 != (rc = videobuf_iolock(q, &buf->vb, NULL)))
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goto fail;
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if (0 != (rc = vbi_buffer_risc(btv,buf,fh->lines)))
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goto fail;
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}
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buf->vb.state = STATE_PREPARED;
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buf->vb.field = field;
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dprintk("buf prepare %p: top=%p bottom=%p field=%s\n",
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vb, &buf->top, &buf->bottom,
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v4l2_field_names[buf->vb.field]);
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return 0;
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fail:
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bttv_dma_free(q,btv,buf);
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return rc;
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}
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static void
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vbi_buffer_queue(struct videobuf_queue *q, struct videobuf_buffer *vb)
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{
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struct bttv_fh *fh = q->priv_data;
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struct bttv *btv = fh->btv;
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struct bttv_buffer *buf = container_of(vb,struct bttv_buffer,vb);
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dprintk("queue %p\n",vb);
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buf->vb.state = STATE_QUEUED;
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list_add_tail(&buf->vb.queue,&btv->vcapture);
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if (NULL == btv->cvbi) {
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fh->btv->loop_irq |= 4;
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bttv_set_dma(btv,0x0c);
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}
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}
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static void vbi_buffer_release(struct videobuf_queue *q, struct videobuf_buffer *vb)
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{
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struct bttv_fh *fh = q->priv_data;
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struct bttv *btv = fh->btv;
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struct bttv_buffer *buf = container_of(vb,struct bttv_buffer,vb);
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dprintk("free %p\n",vb);
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bttv_dma_free(&fh->cap,fh->btv,buf);
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}
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struct videobuf_queue_ops bttv_vbi_qops = {
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.buf_setup = vbi_buffer_setup,
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.buf_prepare = vbi_buffer_prepare,
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.buf_queue = vbi_buffer_queue,
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.buf_release = vbi_buffer_release,
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};
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/* ----------------------------------------------------------------------- */
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void bttv_vbi_setlines(struct bttv_fh *fh, struct bttv *btv, int lines)
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{
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int vdelay;
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if (lines < 1)
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lines = 1;
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if (lines > VBI_MAXLINES)
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lines = VBI_MAXLINES;
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fh->lines = lines;
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vdelay = btread(BT848_E_VDELAY_LO);
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if (vdelay < lines*2) {
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vdelay = lines*2;
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btwrite(vdelay,BT848_E_VDELAY_LO);
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btwrite(vdelay,BT848_O_VDELAY_LO);
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}
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}
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void bttv_vbi_try_fmt(struct bttv_fh *fh, struct v4l2_format *f)
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{
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const struct bttv_tvnorm *tvnorm;
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s64 count0,count1,count;
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tvnorm = &bttv_tvnorms[fh->btv->tvnorm];
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f->type = V4L2_BUF_TYPE_VBI_CAPTURE;
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f->fmt.vbi.sampling_rate = tvnorm->Fsc;
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f->fmt.vbi.samples_per_line = 2048;
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f->fmt.vbi.sample_format = V4L2_PIX_FMT_GREY;
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f->fmt.vbi.offset = VBI_OFFSET;
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f->fmt.vbi.flags = 0;
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/* s64 to prevent overflow. */
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count0 = (s64) f->fmt.vbi.start[0] + f->fmt.vbi.count[0]
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- tvnorm->vbistart[0];
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count1 = (s64) f->fmt.vbi.start[1] + f->fmt.vbi.count[1]
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- tvnorm->vbistart[1];
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count = clamp (max (count0, count1), (s64) 1, (s64) VBI_MAXLINES);
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f->fmt.vbi.start[0] = tvnorm->vbistart[0];
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f->fmt.vbi.start[1] = tvnorm->vbistart[1];
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f->fmt.vbi.count[0] = count;
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f->fmt.vbi.count[1] = count;
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f->fmt.vbi.reserved[0] = 0;
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f->fmt.vbi.reserved[1] = 0;
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}
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void bttv_vbi_get_fmt(struct bttv_fh *fh, struct v4l2_format *f)
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{
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const struct bttv_tvnorm *tvnorm;
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tvnorm = &bttv_tvnorms[fh->btv->tvnorm];
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memset(f,0,sizeof(*f));
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f->type = V4L2_BUF_TYPE_VBI_CAPTURE;
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f->fmt.vbi.sampling_rate = tvnorm->Fsc;
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f->fmt.vbi.samples_per_line = 2048;
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f->fmt.vbi.sample_format = V4L2_PIX_FMT_GREY;
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f->fmt.vbi.offset = VBI_OFFSET;
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f->fmt.vbi.start[0] = tvnorm->vbistart[0];
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f->fmt.vbi.start[1] = tvnorm->vbistart[1];
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f->fmt.vbi.count[0] = fh->lines;
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f->fmt.vbi.count[1] = fh->lines;
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f->fmt.vbi.flags = 0;
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}
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/* ----------------------------------------------------------------------- */
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/*
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* Local variables:
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* c-basic-offset: 8
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* End:
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*/
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