| /* |
| |
| bttv - Bt848 frame grabber driver |
| vbi interface |
| |
| (c) 2002 Gerd Knorr <kraxel@bytesex.org> |
| |
| Copyright (C) 2005, 2006 Michael H. Schimek <mschimek@gmx.at> |
| Sponsored by OPQ Systems AB |
| |
| 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/errno.h> |
| #include <linux/fs.h> |
| #include <linux/kernel.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) to start of VBI capture, |
| in fCLKx2 pixels. According to the datasheet, VBI capture starts |
| VBI_HDELAY fCLKx1 pixels from the tailing edgeof /HRESET, and /HRESET |
| is 64 fCLKx1 pixels wide. VBI_HDELAY is set to 0, so this should be |
| (64 + 0) * 2 = 128 fCLKx2 pixels. But it's not! The datasheet is |
| Just Plain Wrong. The real value appears to be different for |
| different revisions of the bt8x8 chips, and to be affected by the |
| horizontal scaling factor. Experimentally, the value is measured |
| to be about 244. */ |
| #define VBI_OFFSET 244 |
| |
| /* 2048 for compatibility with earlier driver versions. The driver |
| really stores 1024 + tvnorm->vbipack * 4 samples per line in the |
| buffer. Note tvnorm->vbipack is <= 0xFF (limit of VBIPACK_LO + HI |
| is 0x1FF DWORDs) and VBI read()s store a frame counter in the last |
| four bytes of the VBI image. */ |
| #define VBI_BPL 2048 |
| |
| /* Compatibility. */ |
| #define VBI_DEFLINES 16 |
| |
| static unsigned int vbibufs = 4; |
| static unsigned int vbi_debug; |
| |
| 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) |
| |
| #define IMAGE_SIZE(fmt) \ |
| (((fmt)->count[0] + (fmt)->count[1]) * (fmt)->samples_per_line) |
| |
| /* ----------------------------------------------------------------------- */ |
| /* vbi risc code + mm */ |
| |
| 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 = IMAGE_SIZE(&fh->vbi_fmt.fmt); |
| |
| dprintk("setup: samples=%u start=%d,%d count=%u,%u\n", |
| fh->vbi_fmt.fmt.samples_per_line, |
| fh->vbi_fmt.fmt.start[0], |
| fh->vbi_fmt.fmt.start[1], |
| fh->vbi_fmt.fmt.count[0], |
| fh->vbi_fmt.fmt.count[1]); |
| |
| 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); |
| const struct bttv_tvnorm *tvnorm; |
| unsigned int skip_lines0, skip_lines1, min_vdelay; |
| int redo_dma_risc; |
| int rc; |
| |
| buf->vb.size = IMAGE_SIZE(&fh->vbi_fmt.fmt); |
| if (0 != buf->vb.baddr && buf->vb.bsize < buf->vb.size) |
| return -EINVAL; |
| |
| tvnorm = fh->vbi_fmt.tvnorm; |
| |
| /* There's no VBI_VDELAY register, RISC must skip the lines |
| we don't want. With default parameters we skip zero lines |
| as earlier driver versions did. The driver permits video |
| standard changes while capturing, so we use vbi_fmt.tvnorm |
| instead of btv->tvnorm to skip zero lines after video |
| standard changes as well. */ |
| |
| skip_lines0 = 0; |
| skip_lines1 = 0; |
| |
| if (fh->vbi_fmt.fmt.count[0] > 0) |
| skip_lines0 = max(0, (fh->vbi_fmt.fmt.start[0] |
| - tvnorm->vbistart[0])); |
| if (fh->vbi_fmt.fmt.count[1] > 0) |
| skip_lines1 = max(0, (fh->vbi_fmt.fmt.start[1] |
| - tvnorm->vbistart[1])); |
| |
| redo_dma_risc = 0; |
| |
| if (buf->vbi_skip[0] != skip_lines0 || |
| buf->vbi_skip[1] != skip_lines1 || |
| buf->vbi_count[0] != fh->vbi_fmt.fmt.count[0] || |
| buf->vbi_count[1] != fh->vbi_fmt.fmt.count[1]) { |
| buf->vbi_skip[0] = skip_lines0; |
| buf->vbi_skip[1] = skip_lines1; |
| buf->vbi_count[0] = fh->vbi_fmt.fmt.count[0]; |
| buf->vbi_count[1] = fh->vbi_fmt.fmt.count[1]; |
| redo_dma_risc = 1; |
| } |
| |
| if (VIDEOBUF_NEEDS_INIT == buf->vb.state) { |
| redo_dma_risc = 1; |
| if (0 != (rc = videobuf_iolock(q, &buf->vb, NULL))) |
| goto fail; |
| } |
| |
| if (redo_dma_risc) { |
| unsigned int bpl, padding, offset; |
| struct videobuf_dmabuf *dma=videobuf_to_dma(&buf->vb); |
| |
| bpl = 2044; /* max. vbipack */ |
| padding = VBI_BPL - bpl; |
| |
| if (fh->vbi_fmt.fmt.count[0] > 0) { |
| rc = bttv_risc_packed(btv, &buf->top, |
| dma->sglist, |
| /* offset */ 0, bpl, |
| padding, skip_lines0, |
| fh->vbi_fmt.fmt.count[0]); |
| if (0 != rc) |
| goto fail; |
| } |
| |
| if (fh->vbi_fmt.fmt.count[1] > 0) { |
| offset = fh->vbi_fmt.fmt.count[0] * VBI_BPL; |
| |
| rc = bttv_risc_packed(btv, &buf->bottom, |
| dma->sglist, |
| offset, bpl, |
| padding, skip_lines1, |
| fh->vbi_fmt.fmt.count[1]); |
| if (0 != rc) |
| goto fail; |
| } |
| } |
| |
| /* VBI capturing ends at VDELAY, start of video capturing, |
| no matter where the RISC program ends. VDELAY minimum is 2, |
| bounds.top is the corresponding first field line number |
| times two. VDELAY counts half field lines. */ |
| min_vdelay = MIN_VDELAY; |
| if (fh->vbi_fmt.end >= tvnorm->cropcap.bounds.top) |
| min_vdelay += fh->vbi_fmt.end - tvnorm->cropcap.bounds.top; |
| |
| /* For bttv_buffer_activate_vbi(). */ |
| buf->geo.vdelay = min_vdelay; |
| |
| buf->vb.state = VIDEOBUF_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 = VIDEOBUF_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(q,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, |
| }; |
| |
| /* ----------------------------------------------------------------------- */ |
| |
| static int try_fmt(struct v4l2_vbi_format *f, const struct bttv_tvnorm *tvnorm, |
| __s32 crop_start) |
| { |
| __s32 min_start, max_start, max_end, f2_offset; |
| unsigned int i; |
| |
| /* For compatibility with earlier driver versions we must pretend |
| the VBI and video capture window may overlap. In reality RISC |
| magic aborts VBI capturing at the first line of video capturing, |
| leaving the rest of the buffer unchanged, usually all zero. |
| VBI capturing must always start before video capturing. >> 1 |
| because cropping counts field lines times two. */ |
| min_start = tvnorm->vbistart[0]; |
| max_start = (crop_start >> 1) - 1; |
| max_end = (tvnorm->cropcap.bounds.top |
| + tvnorm->cropcap.bounds.height) >> 1; |
| |
| if (min_start > max_start) |
| return -EBUSY; |
| |
| BUG_ON(max_start >= max_end); |
| |
| f->sampling_rate = tvnorm->Fsc; |
| f->samples_per_line = VBI_BPL; |
| f->sample_format = V4L2_PIX_FMT_GREY; |
| f->offset = VBI_OFFSET; |
| |
| f2_offset = tvnorm->vbistart[1] - tvnorm->vbistart[0]; |
| |
| for (i = 0; i < 2; ++i) { |
| if (0 == f->count[i]) { |
| /* No data from this field. We leave f->start[i] |
| alone because VIDIOCSVBIFMT is w/o and EINVALs |
| when a driver does not support exactly the |
| requested parameters. */ |
| } else { |
| s64 start, count; |
| |
| start = clamp(f->start[i], min_start, max_start); |
| /* s64 to prevent overflow. */ |
| count = (s64) f->start[i] + f->count[i] - start; |
| f->start[i] = start; |
| f->count[i] = clamp(count, (s64) 1, |
| max_end - start); |
| } |
| |
| min_start += f2_offset; |
| max_start += f2_offset; |
| max_end += f2_offset; |
| } |
| |
| if (0 == (f->count[0] | f->count[1])) { |
| /* As in earlier driver versions. */ |
| f->start[0] = tvnorm->vbistart[0]; |
| f->start[1] = tvnorm->vbistart[1]; |
| f->count[0] = 1; |
| f->count[1] = 1; |
| } |
| |
| f->flags = 0; |
| |
| f->reserved[0] = 0; |
| f->reserved[1] = 0; |
| |
| return 0; |
| } |
| |
| int bttv_try_fmt_vbi_cap(struct file *file, void *f, struct v4l2_format *frt) |
| { |
| struct bttv_fh *fh = f; |
| struct bttv *btv = fh->btv; |
| const struct bttv_tvnorm *tvnorm; |
| __s32 crop_start; |
| |
| mutex_lock(&btv->lock); |
| |
| tvnorm = &bttv_tvnorms[btv->tvnorm]; |
| crop_start = btv->crop_start; |
| |
| mutex_unlock(&btv->lock); |
| |
| return try_fmt(&frt->fmt.vbi, tvnorm, crop_start); |
| } |
| |
| |
| int bttv_s_fmt_vbi_cap(struct file *file, void *f, struct v4l2_format *frt) |
| { |
| struct bttv_fh *fh = f; |
| struct bttv *btv = fh->btv; |
| const struct bttv_tvnorm *tvnorm; |
| __s32 start1, end; |
| int rc; |
| |
| mutex_lock(&btv->lock); |
| |
| rc = -EBUSY; |
| if (fh->resources & RESOURCE_VBI) |
| goto fail; |
| |
| tvnorm = &bttv_tvnorms[btv->tvnorm]; |
| |
| rc = try_fmt(&frt->fmt.vbi, tvnorm, btv->crop_start); |
| if (0 != rc) |
| goto fail; |
| |
| start1 = frt->fmt.vbi.start[1] - tvnorm->vbistart[1] + |
| tvnorm->vbistart[0]; |
| |
| /* First possible line of video capturing. Should be |
| max(f->start[0] + f->count[0], start1 + f->count[1]) * 2 |
| when capturing both fields. But for compatibility we must |
| pretend the VBI and video capture window may overlap, |
| so end = start + 1, the lowest possible value, times two |
| because vbi_fmt.end counts field lines times two. */ |
| end = max(frt->fmt.vbi.start[0], start1) * 2 + 2; |
| |
| mutex_lock(&fh->vbi.vb_lock); |
| |
| fh->vbi_fmt.fmt = frt->fmt.vbi; |
| fh->vbi_fmt.tvnorm = tvnorm; |
| fh->vbi_fmt.end = end; |
| |
| mutex_unlock(&fh->vbi.vb_lock); |
| |
| rc = 0; |
| |
| fail: |
| mutex_unlock(&btv->lock); |
| |
| return rc; |
| } |
| |
| |
| int bttv_g_fmt_vbi_cap(struct file *file, void *f, struct v4l2_format *frt) |
| { |
| struct bttv_fh *fh = f; |
| const struct bttv_tvnorm *tvnorm; |
| |
| frt->fmt.vbi = fh->vbi_fmt.fmt; |
| |
| tvnorm = &bttv_tvnorms[fh->btv->tvnorm]; |
| |
| if (tvnorm != fh->vbi_fmt.tvnorm) { |
| __s32 max_end; |
| unsigned int i; |
| |
| /* As in vbi_buffer_prepare() this imitates the |
| behaviour of earlier driver versions after video |
| standard changes, with default parameters anyway. */ |
| |
| max_end = (tvnorm->cropcap.bounds.top |
| + tvnorm->cropcap.bounds.height) >> 1; |
| |
| frt->fmt.vbi.sampling_rate = tvnorm->Fsc; |
| |
| for (i = 0; i < 2; ++i) { |
| __s32 new_start; |
| |
| new_start = frt->fmt.vbi.start[i] |
| + tvnorm->vbistart[i] |
| - fh->vbi_fmt.tvnorm->vbistart[i]; |
| |
| frt->fmt.vbi.start[i] = min(new_start, max_end - 1); |
| frt->fmt.vbi.count[i] = |
| min((__s32) frt->fmt.vbi.count[i], |
| max_end - frt->fmt.vbi.start[i]); |
| |
| max_end += tvnorm->vbistart[1] |
| - tvnorm->vbistart[0]; |
| } |
| } |
| return 0; |
| } |
| |
| void bttv_vbi_fmt_reset(struct bttv_vbi_fmt *f, int norm) |
| { |
| const struct bttv_tvnorm *tvnorm; |
| unsigned int real_samples_per_line; |
| unsigned int real_count; |
| |
| tvnorm = &bttv_tvnorms[norm]; |
| |
| f->fmt.sampling_rate = tvnorm->Fsc; |
| f->fmt.samples_per_line = VBI_BPL; |
| f->fmt.sample_format = V4L2_PIX_FMT_GREY; |
| f->fmt.offset = VBI_OFFSET; |
| f->fmt.start[0] = tvnorm->vbistart[0]; |
| f->fmt.start[1] = tvnorm->vbistart[1]; |
| f->fmt.count[0] = VBI_DEFLINES; |
| f->fmt.count[1] = VBI_DEFLINES; |
| f->fmt.flags = 0; |
| f->fmt.reserved[0] = 0; |
| f->fmt.reserved[1] = 0; |
| |
| /* For compatibility the buffer size must be 2 * VBI_DEFLINES * |
| VBI_BPL regardless of the current video standard. */ |
| real_samples_per_line = 1024 + tvnorm->vbipack * 4; |
| real_count = ((tvnorm->cropcap.defrect.top >> 1) |
| - tvnorm->vbistart[0]); |
| |
| BUG_ON(real_samples_per_line > VBI_BPL); |
| BUG_ON(real_count > VBI_DEFLINES); |
| |
| f->tvnorm = tvnorm; |
| |
| /* See bttv_vbi_fmt_set(). */ |
| f->end = tvnorm->vbistart[0] * 2 + 2; |
| } |
| |
| /* ----------------------------------------------------------------------- */ |
| /* |
| * Local variables: |
| * c-basic-offset: 8 |
| * End: |
| */ |