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)
5
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.
11
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.
16
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.
21
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
25*/
26
27
28#include "pwc.h"
29
30const int pwc_image_sizes[PSZ_MAX][2] =
31{
32	{ 128,  96 }, /* sqcif */
33	{ 160, 120 }, /* qsif */
34	{ 176, 144 }, /* qcif */
35	{ 320, 240 }, /* sif */
36	{ 352, 288 }, /* cif */
37	{ 640, 480 }, /* vga */
38};
39
40/* x,y -> PSZ_ */
41int pwc_get_size(struct pwc_device *pdev, int width, int height)
42{
43	int i;
44
45	/* Find the largest size supported by the camera that fits into the
46	   requested size. */
47	for (i = PSZ_MAX - 1; i >= 0; i--) {
48		if (!(pdev->image_mask & (1 << i)))
49			continue;
50
51		if (pwc_image_sizes[i][0] <= width &&
52		    pwc_image_sizes[i][1] <= height)
53			return i;
54	}
55
56	/* No mode found, return the smallest mode we have */
57	for (i = 0; i < PSZ_MAX; i++) {
58		if (pdev->image_mask & (1 << i))
59			return i;
60	}
61
62	/* Never reached there always is atleast one supported mode */
63	return 0;
64}
65
66/* initialize variables depending on type and decompressor */
67void pwc_construct(struct pwc_device *pdev)
68{
69	if (DEVICE_USE_CODEC1(pdev->type)) {
70
71		pdev->image_mask = 1 << PSZ_SQCIF | 1 << PSZ_QCIF | 1 << PSZ_CIF;
72		pdev->vcinterface = 2;
73		pdev->vendpoint = 4;
74		pdev->frame_header_size = 0;
75		pdev->frame_trailer_size = 0;
76
77	} else if (DEVICE_USE_CODEC3(pdev->type)) {
78
79		pdev->image_mask = 1 << PSZ_QSIF | 1 << PSZ_SIF | 1 << PSZ_VGA;
80		pdev->vcinterface = 3;
81		pdev->vendpoint = 5;
82		pdev->frame_header_size = TOUCAM_HEADER_SIZE;
83		pdev->frame_trailer_size = TOUCAM_TRAILER_SIZE;
84
85	} else /* if (DEVICE_USE_CODEC2(pdev->type)) */ {
86
87		pdev->image_mask = 1 << PSZ_SQCIF | 1 << PSZ_QSIF | 1 << PSZ_QCIF | 1 << PSZ_SIF | 1 << PSZ_CIF | 1 << PSZ_VGA;
88		pdev->vcinterface = 3;
89		pdev->vendpoint = 4;
90		pdev->frame_header_size = 0;
91		pdev->frame_trailer_size = 0;
92	}
93}
94