1// SPDX-License-Identifier: GPL-2.0-or-later
2/* Linux driver for Philips webcam
3   Various miscellaneous functions and tables.
4   (C) 1999-2003 Nemosoft Unv.
5   (C) 2004-2006 Luc Saillard (luc@saillard.org)
6
7   NOTE: this version of pwc is an unofficial (modified) release of pwc & pcwx
8   driver and thus may have bugs that are not present in the original version.
9   Please send bug reports and support requests to <luc@saillard.org>.
10   The decompression routines have been implemented by reverse-engineering the
11   Nemosoft binary pwcx module. Caveat emptor.
12
13*/
14
15
16#include "pwc.h"
17
18const int pwc_image_sizes[PSZ_MAX][2] =
19{
20	{ 128,  96 }, /* sqcif */
21	{ 160, 120 }, /* qsif */
22	{ 176, 144 }, /* qcif */
23	{ 320, 240 }, /* sif */
24	{ 352, 288 }, /* cif */
25	{ 640, 480 }, /* vga */
26};
27
28/* x,y -> PSZ_ */
29int pwc_get_size(struct pwc_device *pdev, int width, int height)
30{
31	int i;
32
33	/* Find the largest size supported by the camera that fits into the
34	   requested size. */
35	for (i = PSZ_MAX - 1; i >= 0; i--) {
36		if (!(pdev->image_mask & (1 << i)))
37			continue;
38
39		if (pwc_image_sizes[i][0] <= width &&
40		    pwc_image_sizes[i][1] <= height)
41			return i;
42	}
43
44	/* No mode found, return the smallest mode we have */
45	for (i = 0; i < PSZ_MAX; i++) {
46		if (pdev->image_mask & (1 << i))
47			return i;
48	}
49
50	/* Never reached there always is at least one supported mode */
51	return 0;
52}
53
54/* initialize variables depending on type and decompressor */
55void pwc_construct(struct pwc_device *pdev)
56{
57	if (DEVICE_USE_CODEC1(pdev->type)) {
58
59		pdev->image_mask = 1 << PSZ_SQCIF | 1 << PSZ_QCIF | 1 << PSZ_CIF;
60		pdev->vcinterface = 2;
61		pdev->vendpoint = 4;
62		pdev->frame_header_size = 0;
63		pdev->frame_trailer_size = 0;
64
65	} else if (DEVICE_USE_CODEC3(pdev->type)) {
66
67		pdev->image_mask = 1 << PSZ_QSIF | 1 << PSZ_SIF | 1 << PSZ_VGA;
68		pdev->vcinterface = 3;
69		pdev->vendpoint = 5;
70		pdev->frame_header_size = TOUCAM_HEADER_SIZE;
71		pdev->frame_trailer_size = TOUCAM_TRAILER_SIZE;
72
73	} else /* if (DEVICE_USE_CODEC2(pdev->type)) */ {
74
75		pdev->image_mask = 1 << PSZ_SQCIF | 1 << PSZ_QSIF | 1 << PSZ_QCIF | 1 << PSZ_SIF | 1 << PSZ_CIF | 1 << PSZ_VGA;
76		pdev->vcinterface = 3;
77		pdev->vendpoint = 4;
78		pdev->frame_header_size = 0;
79		pdev->frame_trailer_size = 0;
80	}
81}
82