Loading...
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211 212 213 214 215 216 217 218 219 220 221 | /*
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 <linux/module.h>
#include <linux/moduleparam.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 "bttvp.h"
/* Offset from line sync pulse leading edge (0H) in 1 / sampling_rate:
bt8x8 /HRESET pulse starts at 0H and has length 64 / fCLKx1 (E|O_VTC
HSFMT = 0). VBI_HDELAY (always 0) is an offset from the trailing edge
of /HRESET in 1 / fCLKx1, and the sampling_rate tvnorm->Fsc is fCLKx2. */
#define VBI_OFFSET ((64 + 0) * 2)
#define VBI_DEFLINES 16
#define VBI_MAXLINES 32
static unsigned int vbibufs = 4;
static unsigned int vbi_debug = 0;
module_param(vbibufs, int, 0444);
module_param(vbi_debug, int, 0644);
MODULE_PARM_DESC(vbibufs,"number of vbi buffers, range 2-32, default 4");
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->c.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 videobuf_queue *q,
unsigned int *count, unsigned int *size)
{
struct bttv_fh *fh = q->priv_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 videobuf_queue *q,
struct videobuf_buffer *vb,
enum v4l2_field field)
{
struct bttv_fh *fh = q->priv_data;
struct bttv *btv = fh->btv;
struct bttv_buffer *buf = container_of(vb,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->c.pci, &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 videobuf_queue *q, struct videobuf_buffer *vb)
{
struct bttv_fh *fh = q->priv_data;
struct bttv *btv = fh->btv;
struct bttv_buffer *buf = container_of(vb,struct bttv_buffer,vb);
dprintk("queue %p\n",vb);
buf->vb.state = STATE_QUEUED;
list_add_tail(&buf->vb.queue,&btv->vcapture);
if (NULL == btv->cvbi) {
fh->btv->loop_irq |= 4;
bttv_set_dma(btv,0x0c);
}
}
static void vbi_buffer_release(struct videobuf_queue *q, struct videobuf_buffer *vb)
{
struct bttv_fh *fh = q->priv_data;
struct bttv *btv = fh->btv;
struct bttv_buffer *buf = container_of(vb,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;
s64 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 = VBI_OFFSET;
f->fmt.vbi.flags = 0;
/* s64 to prevent overflow. */
count0 = (s64) f->fmt.vbi.start[0] + f->fmt.vbi.count[0]
- tvnorm->vbistart[0];
count1 = (s64) f->fmt.vbi.start[1] + f->fmt.vbi.count[1]
- tvnorm->vbistart[1];
count = clamp (max (count0, count1), 1LL, (s64) VBI_MAXLINES);
f->fmt.vbi.start[0] = tvnorm->vbistart[0];
f->fmt.vbi.start[1] = tvnorm->vbistart[1];
f->fmt.vbi.count[0] = count;
f->fmt.vbi.count[1] = count;
f->fmt.vbi.reserved[0] = 0;
f->fmt.vbi.reserved[1] = 0;
}
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 = VBI_OFFSET;
f->fmt.vbi.start[0] = tvnorm->vbistart[0];
f->fmt.vbi.start[1] = tvnorm->vbistart[1];
f->fmt.vbi.count[0] = fh->lines;
f->fmt.vbi.count[1] = fh->lines;
f->fmt.vbi.flags = 0;
}
/* ----------------------------------------------------------------------- */
/*
* Local variables:
* c-basic-offset: 8
* End:
*/
|