diff options
Diffstat (limited to 'drivers/media/video/bt8xx/bttv-vbi.c')
| -rw-r--r-- | drivers/media/video/bt8xx/bttv-vbi.c | 221 |
1 files changed, 221 insertions, 0 deletions
diff --git a/drivers/media/video/bt8xx/bttv-vbi.c b/drivers/media/video/bt8xx/bttv-vbi.c new file mode 100644 index 00000000000..e20ff238e40 --- /dev/null +++ b/drivers/media/video/bt8xx/bttv-vbi.c @@ -0,0 +1,221 @@ +/* + + 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(q, &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(q,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->cap,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: + */ |