summaryrefslogtreecommitdiffstats
path: root/drivers/media/video/bt8xx/bttv-vbi.c
diff options
context:
space:
mode:
Diffstat (limited to 'drivers/media/video/bt8xx/bttv-vbi.c')
-rw-r--r--drivers/media/video/bt8xx/bttv-vbi.c221
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:
+ */
generated by cgit v1.2.3-70-g09d2 (git 2.46.0) at 2024-11-01 20:46:43 +0000