drivers/media/video/bttv-vbi.c

   1 /*
   2     $Id: bttv-vbi.c,v 1.9 2005/01/13 17:22:33 kraxel Exp $
   3
   4     bttv - Bt848 frame grabber driver
   5     vbi interface
   6
   7     (c) 2002 Gerd Knorr <kraxel@bytesex.org>
   8
   9     This program is free software; you can redistribute it and/or modify
  10     it under the terms of the GNU General Public License as published by
  11     the Free Software Foundation; either version 2 of the License, or
  12     (at your option) any later version.
  13
  14     This program is distributed in the hope that it will be useful,
  15     but WITHOUT ANY WARRANTY; without even the implied warranty of
  16     MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  17     GNU General Public License for more details.
  18
  19     You should have received a copy of the GNU General Public License
  20     along with this program; if not, write to the Free Software
  21     Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
  22 */
  23
  24 #include <linux/module.h>
  25 #include <linux/moduleparam.h>
  26 #include <linux/errno.h>
  27 #include <linux/fs.h>
  28 #include <linux/kernel.h>
  29 #include <linux/sched.h>
  30 #include <linux/interrupt.h>
  31 #include <linux/kdev_t.h>
  32 #include <asm/io.h>
  33 #include "bttvp.h"
  34
  35 #define VBI_DEFLINES 16
  36 #define VBI_MAXLINES 32
  37
  38 static unsigned int vbibufs = 4;
  39 static unsigned int vbi_debug = 0;
  40
  41 module_param(vbibufs,   int, 0444);
  42 module_param(vbi_debug, int, 0644);
  43 MODULE_PARM_DESC(vbibufs,"number of vbi buffers, range 2-32, default 4");
  44 MODULE_PARM_DESC(vbi_debug,"vbi code debug messages, default is 0 (no)");
  45
  46 #ifdef dprintk
  47 # undef dprintk
  48 #endif
  49 #define dprintk(fmt, arg...)    if (vbi_debug) \
  50         printk(KERN_DEBUG "bttv%d/vbi: " fmt, btv->c.nr , ## arg)
  51
  52 /* ----------------------------------------------------------------------- */
  53 /* vbi risc code + mm                                                      */
  54
  55 static int
  56 vbi_buffer_risc(struct bttv *btv, struct bttv_buffer *buf, int lines)
  57 {
  58         int bpl = 2048;
  59
  60         bttv_risc_packed(btv, &buf->top, buf->vb.dma.sglist,
  61                          0, bpl-4, 4, lines);
  62         bttv_risc_packed(btv, &buf->bottom, buf->vb.dma.sglist,
  63                          lines * bpl, bpl-4, 4, lines);
  64         return 0;
  65 }
  66
  67 static int vbi_buffer_setup(struct videobuf_queue *q,
  68                             unsigned int *count, unsigned int *size)
  69 {
  70         struct bttv_fh *fh = q->priv_data;
  71         struct bttv *btv = fh->btv;
  72
  73         if (0 == *count)
  74                 *count = vbibufs;
  75         *size = fh->lines * 2 * 2048;
  76         dprintk("setup: lines=%d\n",fh->lines);
  77         return 0;
  78 }
  79
  80 static int vbi_buffer_prepare(struct videobuf_queue *q,
  81                               struct videobuf_buffer *vb,
  82                               enum v4l2_field field)
  83 {
  84         struct bttv_fh *fh = q->priv_data;
  85         struct bttv *btv = fh->btv;
  86         struct bttv_buffer *buf = container_of(vb,struct bttv_buffer,vb);
  87         int rc;
  88
  89         buf->vb.size = fh->lines * 2 * 2048;
  90         if (0 != buf->vb.baddr  &&  buf->vb.bsize < buf->vb.size)
  91                 return -EINVAL;
  92
  93         if (STATE_NEEDS_INIT == buf->vb.state) {
  94                 if (0 != (rc = videobuf_iolock(btv->c.pci, &buf->vb, NULL)))
  95                         goto fail;
  96                 if (0 != (rc = vbi_buffer_risc(btv,buf,fh->lines)))
  97                         goto fail;
  98         }
  99         buf->vb.state = STATE_PREPARED;
 100         buf->vb.field = field;
 101         dprintk("buf prepare %p: top=%p bottom=%p field=%s\n",
 102                 vb, &buf->top, &buf->bottom,
 103                 v4l2_field_names[buf->vb.field]);
 104         return 0;
 105
 106  fail:
 107         bttv_dma_free(btv,buf);
 108         return rc;
 109 }
 110
 111 static void
 112 vbi_buffer_queue(struct videobuf_queue *q, struct videobuf_buffer *vb)
 113 {
 114         struct bttv_fh *fh = q->priv_data;
 115         struct bttv *btv = fh->btv;
 116         struct bttv_buffer *buf = container_of(vb,struct bttv_buffer,vb);
 117
 118         dprintk("queue %p\n",vb);
 119         buf->vb.state = STATE_QUEUED;
 120         list_add_tail(&buf->vb.queue,&btv->vcapture);
 121         if (NULL == btv->cvbi) {
 122                 fh->btv->loop_irq |= 4;
 123                 bttv_set_dma(btv,0x0c);
 124         }
 125 }
 126
 127 static void vbi_buffer_release(struct videobuf_queue *q, struct videobuf_buffer *vb)
 128 {
 129         struct bttv_fh *fh = q->priv_data;
 130         struct bttv *btv = fh->btv;
 131         struct bttv_buffer *buf = container_of(vb,struct bttv_buffer,vb);
 132
 133         dprintk("free %p\n",vb);
 134         bttv_dma_free(fh->btv,buf);
 135 }
 136
 137 struct videobuf_queue_ops bttv_vbi_qops = {
 138         .buf_setup    = vbi_buffer_setup,
 139         .buf_prepare  = vbi_buffer_prepare,
 140         .buf_queue    = vbi_buffer_queue,
 141         .buf_release  = vbi_buffer_release,
 142 };
 143
 144 /* ----------------------------------------------------------------------- */
 145
 146 void bttv_vbi_setlines(struct bttv_fh *fh, struct bttv *btv, int lines)
 147 {
 148         int vdelay;
 149
 150         if (lines < 1)
 151                 lines = 1;
 152         if (lines > VBI_MAXLINES)
 153                 lines = VBI_MAXLINES;
 154         fh->lines = lines;
 155
 156         vdelay = btread(BT848_E_VDELAY_LO);
 157         if (vdelay < lines*2) {
 158                 vdelay = lines*2;
 159                 btwrite(vdelay,BT848_E_VDELAY_LO);
 160                 btwrite(vdelay,BT848_O_VDELAY_LO);
 161         }
 162 }
 163
 164 void bttv_vbi_try_fmt(struct bttv_fh *fh, struct v4l2_format *f)
 165 {
 166         const struct bttv_tvnorm *tvnorm;
 167         u32 start0,start1;
 168         s32 count0,count1,count;
 169
 170         tvnorm = &bttv_tvnorms[fh->btv->tvnorm];
 171         f->type = V4L2_BUF_TYPE_VBI_CAPTURE;
 172         f->fmt.vbi.sampling_rate    = tvnorm->Fsc;
 173         f->fmt.vbi.samples_per_line = 2048;
 174         f->fmt.vbi.sample_format    = V4L2_PIX_FMT_GREY;
 175         f->fmt.vbi.offset           = 244;
 176         f->fmt.vbi.flags            = 0;
 177         switch (fh->btv->tvnorm) {
 178         case 1: /* NTSC */
 179                 start0 = 10;
 180                 start1 = 273;
 181                 break;
 182         case 0: /* PAL */
 183         case 2: /* SECAM */
 184         default:
 185                 start0 = 7;
 186                 start1 = 320;
 187         }
 188
 189         count0 = (f->fmt.vbi.start[0] + f->fmt.vbi.count[0]) - start0;
 190         count1 = (f->fmt.vbi.start[1] + f->fmt.vbi.count[1]) - start1;
 191         count  = max(count0,count1);
 192         if (count > VBI_MAXLINES)
 193                 count = VBI_MAXLINES;
 194         if (count < 1)
 195                 count = 1;
 196
 197         f->fmt.vbi.start[0] = start0;
 198         f->fmt.vbi.start[1] = start1;
 199         f->fmt.vbi.count[0] = count;
 200         f->fmt.vbi.count[1] = count;
 201 }
 202
 203 void bttv_vbi_get_fmt(struct bttv_fh *fh, struct v4l2_format *f)
 204 {
 205         const struct bttv_tvnorm *tvnorm;
 206
 207         tvnorm = &bttv_tvnorms[fh->btv->tvnorm];
 208         memset(f,0,sizeof(*f));
 209         f->type = V4L2_BUF_TYPE_VBI_CAPTURE;
 210         f->fmt.vbi.sampling_rate    = tvnorm->Fsc;
 211         f->fmt.vbi.samples_per_line = 2048;
 212         f->fmt.vbi.sample_format    = V4L2_PIX_FMT_GREY;
 213         f->fmt.vbi.offset           = 244;
 214         f->fmt.vbi.count[0]         = fh->lines;
 215         f->fmt.vbi.count[1]         = fh->lines;
 216         f->fmt.vbi.flags            = 0;
 217         switch (fh->btv->tvnorm) {
 218         case 1: /* NTSC */
 219                 f->fmt.vbi.start[0] = 10;
 220                 f->fmt.vbi.start[1] = 273;
 221                 break;
 222         case 0: /* PAL */
 223         case 2: /* SECAM */
 224         default:
 225                 f->fmt.vbi.start[0] = 7;
 226                 f->fmt.vbi.start[1] = 319;
 227         }
 228 }
 229
 230 /* ----------------------------------------------------------------------- */
 231 /*
 232  * Local variables:
 233  * c-basic-offset: 8
 234  * End:
 235  */