allow coexistance of N build and AC build.
[tomato.git] / release / src-rt-6.x / linux / linux-2.6 / drivers / media / video / pwc / pwc-misc.c
blob6af5bb538358c95f2f5567e0a598cff05d75224a
1 /* Linux driver for Philips webcam
2 Various miscellaneous functions and tables.
3 (C) 1999-2003 Nemosoft Unv.
4 (C) 2004-2006 Luc Saillard (luc@saillard.org)
6 NOTE: this version of pwc is an unofficial (modified) release of pwc & pcwx
7 driver and thus may have bugs that are not present in the original version.
8 Please send bug reports and support requests to <luc@saillard.org>.
9 The decompression routines have been implemented by reverse-engineering the
10 Nemosoft binary pwcx module. Caveat emptor.
12 This program is free software; you can redistribute it and/or modify
13 it under the terms of the GNU General Public License as published by
14 the Free Software Foundation; either version 2 of the License, or
15 (at your option) any later version.
17 This program is distributed in the hope that it will be useful,
18 but WITHOUT ANY WARRANTY; without even the implied warranty of
19 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
20 GNU General Public License for more details.
22 You should have received a copy of the GNU General Public License
23 along with this program; if not, write to the Free Software
24 Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
28 #include "pwc.h"
30 const struct pwc_coord pwc_image_sizes[PSZ_MAX] =
32 { 128, 96, 0 }, /* sqcif */
33 { 160, 120, 0 }, /* qsif */
34 { 176, 144, 0 }, /* qcif */
35 { 320, 240, 0 }, /* sif */
36 { 352, 288, 0 }, /* cif */
37 { 640, 480, 0 }, /* vga */
40 /* x,y -> PSZ_ */
41 int pwc_decode_size(struct pwc_device *pdev, int width, int height)
43 int i, find;
45 /* Make sure we don't go beyond our max size.
46 NB: we have different limits for RAW and normal modes. In case
47 you don't have the decompressor loaded or use RAW mode,
48 the maximum viewable size is smaller.
50 if (pdev->pixfmt != V4L2_PIX_FMT_YUV420)
52 if (width > pdev->abs_max.x || height > pdev->abs_max.y)
54 PWC_DEBUG_SIZE("VIDEO_PALETTE_RAW: going beyond abs_max.\n");
55 return -1;
58 else
60 if (width > pdev->view_max.x || height > pdev->view_max.y)
62 PWC_DEBUG_SIZE("VIDEO_PALETTE_not RAW: going beyond view_max.\n");
63 return -1;
67 /* Find the largest size supported by the camera that fits into the
68 requested size.
70 find = -1;
71 for (i = 0; i < PSZ_MAX; i++) {
72 if (pdev->image_mask & (1 << i)) {
73 if (pwc_image_sizes[i].x <= width && pwc_image_sizes[i].y <= height)
74 find = i;
77 return find;
80 /* initialize variables depending on type and decompressor*/
81 void pwc_construct(struct pwc_device *pdev)
83 if (DEVICE_USE_CODEC1(pdev->type)) {
85 pdev->view_min.x = 128;
86 pdev->view_min.y = 96;
87 pdev->view_max.x = 352;
88 pdev->view_max.y = 288;
89 pdev->abs_max.x = 352;
90 pdev->abs_max.y = 288;
91 pdev->image_mask = 1 << PSZ_SQCIF | 1 << PSZ_QCIF | 1 << PSZ_CIF;
92 pdev->vcinterface = 2;
93 pdev->vendpoint = 4;
94 pdev->frame_header_size = 0;
95 pdev->frame_trailer_size = 0;
97 } else if (DEVICE_USE_CODEC3(pdev->type)) {
99 pdev->view_min.x = 160;
100 pdev->view_min.y = 120;
101 pdev->view_max.x = 640;
102 pdev->view_max.y = 480;
103 pdev->image_mask = 1 << PSZ_QSIF | 1 << PSZ_SIF | 1 << PSZ_VGA;
104 pdev->abs_max.x = 640;
105 pdev->abs_max.y = 480;
106 pdev->vcinterface = 3;
107 pdev->vendpoint = 5;
108 pdev->frame_header_size = TOUCAM_HEADER_SIZE;
109 pdev->frame_trailer_size = TOUCAM_TRAILER_SIZE;
111 } else /* if (DEVICE_USE_CODEC2(pdev->type)) */ {
113 pdev->view_min.x = 128;
114 pdev->view_min.y = 96;
115 /* Anthill bug #38: PWC always reports max size, even without PWCX */
116 pdev->view_max.x = 640;
117 pdev->view_max.y = 480;
118 pdev->image_mask = 1 << PSZ_SQCIF | 1 << PSZ_QSIF | 1 << PSZ_QCIF | 1 << PSZ_SIF | 1 << PSZ_CIF | 1 << PSZ_VGA;
119 pdev->abs_max.x = 640;
120 pdev->abs_max.y = 480;
121 pdev->vcinterface = 3;
122 pdev->vendpoint = 4;
123 pdev->frame_header_size = 0;
124 pdev->frame_trailer_size = 0;
126 pdev->pixfmt = V4L2_PIX_FMT_YUV420; /* default */
127 pdev->view_min.size = pdev->view_min.x * pdev->view_min.y;
128 pdev->view_max.size = pdev->view_max.x * pdev->view_max.y;
129 /* length of image, in YUV format; always allocate enough memory. */
130 pdev->len_per_image = PAGE_ALIGN((pdev->abs_max.x * pdev->abs_max.y * 3) / 2);