drivers/media/video/bttv-vbi.c

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