Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1 | /* |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 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> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 28 | #include <linux/interrupt.h> |
| 29 | #include <linux/kdev_t.h> |
| 30 | #include <asm/io.h> |
| 31 | #include "bttvp.h" |
| 32 | |
Trent Piepho | ddecbe1 | 2006-07-26 17:08:29 -0300 | [diff] [blame] | 33 | /* Offset from line sync pulse leading edge (0H) to start of VBI capture, |
| 34 | in fCLKx2 pixels. According to the datasheet, VBI capture starts |
| 35 | VBI_HDELAY fCLKx1 pixels from the tailing edgeof /HRESET, and /HRESET |
| 36 | is 64 fCLKx1 pixels wide. VBI_HDELAY is set to 0, so this should be |
| 37 | (64 + 0) * 2 = 128 fCLKx2 pixels. But it's not! The datasheet is |
| 38 | Just Plain Wrong. The real value appears to be different for |
| 39 | different revisions of the bt8x8 chips, and to be affected by the |
| 40 | horizontal scaling factor. Experimentally, the value is measured |
| 41 | to be about 244. */ |
| 42 | #define VBI_OFFSET 244 |
Michael H. Schimek | 67f1570 | 2006-01-09 15:25:27 -0200 | [diff] [blame] | 43 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 44 | #define VBI_DEFLINES 16 |
| 45 | #define VBI_MAXLINES 32 |
| 46 | |
| 47 | static unsigned int vbibufs = 4; |
| 48 | static unsigned int vbi_debug = 0; |
| 49 | |
| 50 | module_param(vbibufs, int, 0444); |
| 51 | module_param(vbi_debug, int, 0644); |
| 52 | MODULE_PARM_DESC(vbibufs,"number of vbi buffers, range 2-32, default 4"); |
| 53 | MODULE_PARM_DESC(vbi_debug,"vbi code debug messages, default is 0 (no)"); |
| 54 | |
| 55 | #ifdef dprintk |
| 56 | # undef dprintk |
| 57 | #endif |
| 58 | #define dprintk(fmt, arg...) if (vbi_debug) \ |
| 59 | printk(KERN_DEBUG "bttv%d/vbi: " fmt, btv->c.nr , ## arg) |
| 60 | |
| 61 | /* ----------------------------------------------------------------------- */ |
| 62 | /* vbi risc code + mm */ |
| 63 | |
| 64 | static int |
| 65 | vbi_buffer_risc(struct bttv *btv, struct bttv_buffer *buf, int lines) |
| 66 | { |
| 67 | int bpl = 2048; |
| 68 | |
| 69 | bttv_risc_packed(btv, &buf->top, buf->vb.dma.sglist, |
| 70 | 0, bpl-4, 4, lines); |
| 71 | bttv_risc_packed(btv, &buf->bottom, buf->vb.dma.sglist, |
| 72 | lines * bpl, bpl-4, 4, lines); |
| 73 | return 0; |
| 74 | } |
| 75 | |
| 76 | static int vbi_buffer_setup(struct videobuf_queue *q, |
| 77 | unsigned int *count, unsigned int *size) |
| 78 | { |
| 79 | struct bttv_fh *fh = q->priv_data; |
| 80 | struct bttv *btv = fh->btv; |
| 81 | |
| 82 | if (0 == *count) |
| 83 | *count = vbibufs; |
| 84 | *size = fh->lines * 2 * 2048; |
| 85 | dprintk("setup: lines=%d\n",fh->lines); |
| 86 | return 0; |
| 87 | } |
| 88 | |
| 89 | static int vbi_buffer_prepare(struct videobuf_queue *q, |
| 90 | struct videobuf_buffer *vb, |
| 91 | enum v4l2_field field) |
| 92 | { |
| 93 | struct bttv_fh *fh = q->priv_data; |
| 94 | struct bttv *btv = fh->btv; |
| 95 | struct bttv_buffer *buf = container_of(vb,struct bttv_buffer,vb); |
| 96 | int rc; |
| 97 | |
| 98 | buf->vb.size = fh->lines * 2 * 2048; |
| 99 | if (0 != buf->vb.baddr && buf->vb.bsize < buf->vb.size) |
| 100 | return -EINVAL; |
| 101 | |
| 102 | if (STATE_NEEDS_INIT == buf->vb.state) { |
Mauro Carvalho Chehab | c7b0ac0 | 2006-03-10 12:29:15 -0300 | [diff] [blame] | 103 | if (0 != (rc = videobuf_iolock(q, &buf->vb, NULL))) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 104 | goto fail; |
| 105 | if (0 != (rc = vbi_buffer_risc(btv,buf,fh->lines))) |
| 106 | goto fail; |
| 107 | } |
| 108 | buf->vb.state = STATE_PREPARED; |
| 109 | buf->vb.field = field; |
| 110 | dprintk("buf prepare %p: top=%p bottom=%p field=%s\n", |
| 111 | vb, &buf->top, &buf->bottom, |
| 112 | v4l2_field_names[buf->vb.field]); |
| 113 | return 0; |
| 114 | |
| 115 | fail: |
Mauro Carvalho Chehab | c7b0ac0 | 2006-03-10 12:29:15 -0300 | [diff] [blame] | 116 | bttv_dma_free(q,btv,buf); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 117 | return rc; |
| 118 | } |
| 119 | |
| 120 | static void |
| 121 | vbi_buffer_queue(struct videobuf_queue *q, struct videobuf_buffer *vb) |
| 122 | { |
| 123 | struct bttv_fh *fh = q->priv_data; |
| 124 | struct bttv *btv = fh->btv; |
| 125 | struct bttv_buffer *buf = container_of(vb,struct bttv_buffer,vb); |
| 126 | |
| 127 | dprintk("queue %p\n",vb); |
| 128 | buf->vb.state = STATE_QUEUED; |
| 129 | list_add_tail(&buf->vb.queue,&btv->vcapture); |
| 130 | if (NULL == btv->cvbi) { |
| 131 | fh->btv->loop_irq |= 4; |
| 132 | bttv_set_dma(btv,0x0c); |
| 133 | } |
| 134 | } |
| 135 | |
| 136 | static void vbi_buffer_release(struct videobuf_queue *q, struct videobuf_buffer *vb) |
| 137 | { |
| 138 | struct bttv_fh *fh = q->priv_data; |
| 139 | struct bttv *btv = fh->btv; |
| 140 | struct bttv_buffer *buf = container_of(vb,struct bttv_buffer,vb); |
| 141 | |
| 142 | dprintk("free %p\n",vb); |
Mauro Carvalho Chehab | c7b0ac0 | 2006-03-10 12:29:15 -0300 | [diff] [blame] | 143 | bttv_dma_free(&fh->cap,fh->btv,buf); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 144 | } |
| 145 | |
| 146 | struct videobuf_queue_ops bttv_vbi_qops = { |
| 147 | .buf_setup = vbi_buffer_setup, |
| 148 | .buf_prepare = vbi_buffer_prepare, |
| 149 | .buf_queue = vbi_buffer_queue, |
| 150 | .buf_release = vbi_buffer_release, |
| 151 | }; |
| 152 | |
| 153 | /* ----------------------------------------------------------------------- */ |
| 154 | |
| 155 | void bttv_vbi_setlines(struct bttv_fh *fh, struct bttv *btv, int lines) |
| 156 | { |
| 157 | int vdelay; |
| 158 | |
| 159 | if (lines < 1) |
| 160 | lines = 1; |
| 161 | if (lines > VBI_MAXLINES) |
| 162 | lines = VBI_MAXLINES; |
| 163 | fh->lines = lines; |
| 164 | |
| 165 | vdelay = btread(BT848_E_VDELAY_LO); |
| 166 | if (vdelay < lines*2) { |
| 167 | vdelay = lines*2; |
| 168 | btwrite(vdelay,BT848_E_VDELAY_LO); |
| 169 | btwrite(vdelay,BT848_O_VDELAY_LO); |
| 170 | } |
| 171 | } |
| 172 | |
| 173 | void bttv_vbi_try_fmt(struct bttv_fh *fh, struct v4l2_format *f) |
| 174 | { |
| 175 | const struct bttv_tvnorm *tvnorm; |
Michael H. Schimek | 67f1570 | 2006-01-09 15:25:27 -0200 | [diff] [blame] | 176 | s64 count0,count1,count; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 177 | |
| 178 | tvnorm = &bttv_tvnorms[fh->btv->tvnorm]; |
| 179 | f->type = V4L2_BUF_TYPE_VBI_CAPTURE; |
| 180 | f->fmt.vbi.sampling_rate = tvnorm->Fsc; |
| 181 | f->fmt.vbi.samples_per_line = 2048; |
| 182 | f->fmt.vbi.sample_format = V4L2_PIX_FMT_GREY; |
Michael H. Schimek | 67f1570 | 2006-01-09 15:25:27 -0200 | [diff] [blame] | 183 | f->fmt.vbi.offset = VBI_OFFSET; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 184 | f->fmt.vbi.flags = 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 185 | |
Michael H. Schimek | 67f1570 | 2006-01-09 15:25:27 -0200 | [diff] [blame] | 186 | /* s64 to prevent overflow. */ |
| 187 | count0 = (s64) f->fmt.vbi.start[0] + f->fmt.vbi.count[0] |
| 188 | - tvnorm->vbistart[0]; |
| 189 | count1 = (s64) f->fmt.vbi.start[1] + f->fmt.vbi.count[1] |
| 190 | - tvnorm->vbistart[1]; |
Mauro Carvalho Chehab | 4ae5c2e | 2006-03-25 15:53:38 -0300 | [diff] [blame] | 191 | count = clamp (max (count0, count1), (s64) 1, (s64) VBI_MAXLINES); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 192 | |
Michael H. Schimek | 67f1570 | 2006-01-09 15:25:27 -0200 | [diff] [blame] | 193 | f->fmt.vbi.start[0] = tvnorm->vbistart[0]; |
| 194 | f->fmt.vbi.start[1] = tvnorm->vbistart[1]; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 195 | f->fmt.vbi.count[0] = count; |
| 196 | f->fmt.vbi.count[1] = count; |
Michael H. Schimek | 67f1570 | 2006-01-09 15:25:27 -0200 | [diff] [blame] | 197 | |
| 198 | f->fmt.vbi.reserved[0] = 0; |
| 199 | f->fmt.vbi.reserved[1] = 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 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; |
Michael H. Schimek | 67f1570 | 2006-01-09 15:25:27 -0200 | [diff] [blame] | 212 | f->fmt.vbi.offset = VBI_OFFSET; |
| 213 | f->fmt.vbi.start[0] = tvnorm->vbistart[0]; |
| 214 | f->fmt.vbi.start[1] = tvnorm->vbistart[1]; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 215 | f->fmt.vbi.count[0] = fh->lines; |
| 216 | f->fmt.vbi.count[1] = fh->lines; |
| 217 | f->fmt.vbi.flags = 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 218 | } |
| 219 | |
| 220 | /* ----------------------------------------------------------------------- */ |
| 221 | /* |
| 222 | * Local variables: |
| 223 | * c-basic-offset: 8 |
| 224 | * End: |
| 225 | */ |