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Commit | Line | Data |
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1da177e4 | 1 | /* |
1da177e4 LT |
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 | ||
67f1570a MS |
34 | /* Offset from line sync pulse leading edge (0H) in 1 / sampling_rate: |
35 | bt8x8 /HRESET pulse starts at 0H and has length 64 / fCLKx1 (E|O_VTC | |
36 | HSFMT = 0). VBI_HDELAY (always 0) is an offset from the trailing edge | |
37 | of /HRESET in 1 / fCLKx1, and the sampling_rate tvnorm->Fsc is fCLKx2. */ | |
38 | #define VBI_OFFSET ((64 + 0) * 2) | |
39 | ||
1da177e4 LT |
40 | #define VBI_DEFLINES 16 |
41 | #define VBI_MAXLINES 32 | |
42 | ||
43 | static unsigned int vbibufs = 4; | |
44 | static unsigned int vbi_debug = 0; | |
45 | ||
46 | module_param(vbibufs, int, 0444); | |
47 | module_param(vbi_debug, int, 0644); | |
48 | MODULE_PARM_DESC(vbibufs,"number of vbi buffers, range 2-32, default 4"); | |
49 | MODULE_PARM_DESC(vbi_debug,"vbi code debug messages, default is 0 (no)"); | |
50 | ||
51 | #ifdef dprintk | |
52 | # undef dprintk | |
53 | #endif | |
54 | #define dprintk(fmt, arg...) if (vbi_debug) \ | |
55 | printk(KERN_DEBUG "bttv%d/vbi: " fmt, btv->c.nr , ## arg) | |
56 | ||
57 | /* ----------------------------------------------------------------------- */ | |
58 | /* vbi risc code + mm */ | |
59 | ||
60 | static int | |
61 | vbi_buffer_risc(struct bttv *btv, struct bttv_buffer *buf, int lines) | |
62 | { | |
63 | int bpl = 2048; | |
64 | ||
65 | bttv_risc_packed(btv, &buf->top, buf->vb.dma.sglist, | |
66 | 0, bpl-4, 4, lines); | |
67 | bttv_risc_packed(btv, &buf->bottom, buf->vb.dma.sglist, | |
68 | lines * bpl, bpl-4, 4, lines); | |
69 | return 0; | |
70 | } | |
71 | ||
72 | static int vbi_buffer_setup(struct videobuf_queue *q, | |
73 | unsigned int *count, unsigned int *size) | |
74 | { | |
75 | struct bttv_fh *fh = q->priv_data; | |
76 | struct bttv *btv = fh->btv; | |
77 | ||
78 | if (0 == *count) | |
79 | *count = vbibufs; | |
80 | *size = fh->lines * 2 * 2048; | |
81 | dprintk("setup: lines=%d\n",fh->lines); | |
82 | return 0; | |
83 | } | |
84 | ||
85 | static int vbi_buffer_prepare(struct videobuf_queue *q, | |
86 | struct videobuf_buffer *vb, | |
87 | enum v4l2_field field) | |
88 | { | |
89 | struct bttv_fh *fh = q->priv_data; | |
90 | struct bttv *btv = fh->btv; | |
91 | struct bttv_buffer *buf = container_of(vb,struct bttv_buffer,vb); | |
92 | int rc; | |
93 | ||
94 | buf->vb.size = fh->lines * 2 * 2048; | |
95 | if (0 != buf->vb.baddr && buf->vb.bsize < buf->vb.size) | |
96 | return -EINVAL; | |
97 | ||
98 | if (STATE_NEEDS_INIT == buf->vb.state) { | |
99 | if (0 != (rc = videobuf_iolock(btv->c.pci, &buf->vb, NULL))) | |
100 | goto fail; | |
101 | if (0 != (rc = vbi_buffer_risc(btv,buf,fh->lines))) | |
102 | goto fail; | |
103 | } | |
104 | buf->vb.state = STATE_PREPARED; | |
105 | buf->vb.field = field; | |
106 | dprintk("buf prepare %p: top=%p bottom=%p field=%s\n", | |
107 | vb, &buf->top, &buf->bottom, | |
108 | v4l2_field_names[buf->vb.field]); | |
109 | return 0; | |
110 | ||
111 | fail: | |
112 | bttv_dma_free(btv,buf); | |
113 | return rc; | |
114 | } | |
115 | ||
116 | static void | |
117 | vbi_buffer_queue(struct videobuf_queue *q, struct videobuf_buffer *vb) | |
118 | { | |
119 | struct bttv_fh *fh = q->priv_data; | |
120 | struct bttv *btv = fh->btv; | |
121 | struct bttv_buffer *buf = container_of(vb,struct bttv_buffer,vb); | |
122 | ||
123 | dprintk("queue %p\n",vb); | |
124 | buf->vb.state = STATE_QUEUED; | |
125 | list_add_tail(&buf->vb.queue,&btv->vcapture); | |
126 | if (NULL == btv->cvbi) { | |
127 | fh->btv->loop_irq |= 4; | |
128 | bttv_set_dma(btv,0x0c); | |
129 | } | |
130 | } | |
131 | ||
132 | static void vbi_buffer_release(struct videobuf_queue *q, struct videobuf_buffer *vb) | |
133 | { | |
134 | struct bttv_fh *fh = q->priv_data; | |
135 | struct bttv *btv = fh->btv; | |
136 | struct bttv_buffer *buf = container_of(vb,struct bttv_buffer,vb); | |
137 | ||
138 | dprintk("free %p\n",vb); | |
139 | bttv_dma_free(fh->btv,buf); | |
140 | } | |
141 | ||
142 | struct videobuf_queue_ops bttv_vbi_qops = { | |
143 | .buf_setup = vbi_buffer_setup, | |
144 | .buf_prepare = vbi_buffer_prepare, | |
145 | .buf_queue = vbi_buffer_queue, | |
146 | .buf_release = vbi_buffer_release, | |
147 | }; | |
148 | ||
149 | /* ----------------------------------------------------------------------- */ | |
150 | ||
151 | void bttv_vbi_setlines(struct bttv_fh *fh, struct bttv *btv, int lines) | |
152 | { | |
153 | int vdelay; | |
154 | ||
155 | if (lines < 1) | |
156 | lines = 1; | |
157 | if (lines > VBI_MAXLINES) | |
158 | lines = VBI_MAXLINES; | |
159 | fh->lines = lines; | |
160 | ||
161 | vdelay = btread(BT848_E_VDELAY_LO); | |
162 | if (vdelay < lines*2) { | |
163 | vdelay = lines*2; | |
164 | btwrite(vdelay,BT848_E_VDELAY_LO); | |
165 | btwrite(vdelay,BT848_O_VDELAY_LO); | |
166 | } | |
167 | } | |
168 | ||
169 | void bttv_vbi_try_fmt(struct bttv_fh *fh, struct v4l2_format *f) | |
170 | { | |
171 | const struct bttv_tvnorm *tvnorm; | |
67f1570a | 172 | s64 count0,count1,count; |
1da177e4 LT |
173 | |
174 | tvnorm = &bttv_tvnorms[fh->btv->tvnorm]; | |
175 | f->type = V4L2_BUF_TYPE_VBI_CAPTURE; | |
176 | f->fmt.vbi.sampling_rate = tvnorm->Fsc; | |
177 | f->fmt.vbi.samples_per_line = 2048; | |
178 | f->fmt.vbi.sample_format = V4L2_PIX_FMT_GREY; | |
67f1570a | 179 | f->fmt.vbi.offset = VBI_OFFSET; |
1da177e4 | 180 | f->fmt.vbi.flags = 0; |
1da177e4 | 181 | |
67f1570a MS |
182 | /* s64 to prevent overflow. */ |
183 | count0 = (s64) f->fmt.vbi.start[0] + f->fmt.vbi.count[0] | |
184 | - tvnorm->vbistart[0]; | |
185 | count1 = (s64) f->fmt.vbi.start[1] + f->fmt.vbi.count[1] | |
186 | - tvnorm->vbistart[1]; | |
187 | count = clamp (max (count0, count1), 1LL, (s64) VBI_MAXLINES); | |
1da177e4 | 188 | |
67f1570a MS |
189 | f->fmt.vbi.start[0] = tvnorm->vbistart[0]; |
190 | f->fmt.vbi.start[1] = tvnorm->vbistart[1]; | |
1da177e4 LT |
191 | f->fmt.vbi.count[0] = count; |
192 | f->fmt.vbi.count[1] = count; | |
67f1570a MS |
193 | |
194 | f->fmt.vbi.reserved[0] = 0; | |
195 | f->fmt.vbi.reserved[1] = 0; | |
1da177e4 LT |
196 | } |
197 | ||
198 | void bttv_vbi_get_fmt(struct bttv_fh *fh, struct v4l2_format *f) | |
199 | { | |
200 | const struct bttv_tvnorm *tvnorm; | |
201 | ||
202 | tvnorm = &bttv_tvnorms[fh->btv->tvnorm]; | |
203 | memset(f,0,sizeof(*f)); | |
204 | f->type = V4L2_BUF_TYPE_VBI_CAPTURE; | |
205 | f->fmt.vbi.sampling_rate = tvnorm->Fsc; | |
206 | f->fmt.vbi.samples_per_line = 2048; | |
207 | f->fmt.vbi.sample_format = V4L2_PIX_FMT_GREY; | |
67f1570a MS |
208 | f->fmt.vbi.offset = VBI_OFFSET; |
209 | f->fmt.vbi.start[0] = tvnorm->vbistart[0]; | |
210 | f->fmt.vbi.start[1] = tvnorm->vbistart[1]; | |
1da177e4 LT |
211 | f->fmt.vbi.count[0] = fh->lines; |
212 | f->fmt.vbi.count[1] = fh->lines; | |
213 | f->fmt.vbi.flags = 0; | |
1da177e4 LT |
214 | } |
215 | ||
216 | /* ----------------------------------------------------------------------- */ | |
217 | /* | |
218 | * Local variables: | |
219 | * c-basic-offset: 8 | |
220 | * End: | |
221 | */ |