// SPDX-License-Identifier: GPL-2.0-or-later
/* Linux driver for Philips webcam
   Various miscellaneous functions and tables.
   (C) 1999-2003 Nemosoft Unv.
   (C) 2004-2006 Luc Saillard (luc@saillard.org)

   NOTE: this version of pwc is an unofficial (modified) release of pwc & pcwx
   driver and thus may have bugs that are not present in the original version.
   Please send bug reports and support requests to <luc@saillard.org>.
   The decompression routines have been implemented by reverse-engineering the
   Nemosoft binary pwcx module. Caveat emptor.

*/


#include "pwc.h"

const int pwc_image_sizes[PSZ_MAX][2] =
{
        { 128,  96 }, /* sqcif */
        { 160, 120 }, /* qsif */
        { 176, 144 }, /* qcif */
        { 320, 240 }, /* sif */
        { 352, 288 }, /* cif */
        { 640, 480 }, /* vga */
};

/* x,y -> PSZ_ */
int pwc_get_size(struct pwc_device *pdev, int width, int height)
{
        int i;

        /* Find the largest size supported by the camera that fits into the
           requested size. */
        for (i = PSZ_MAX - 1; i >= 0; i--) {
                if (!(pdev->image_mask & (1 << i)))
                        continue;

                if (pwc_image_sizes[i][0] <= width &&
                    pwc_image_sizes[i][1] <= height)
                        return i;
        }

        /* No mode found, return the smallest mode we have */
        for (i = 0; i < PSZ_MAX; i++) {
                if (pdev->image_mask & (1 << i))
                        return i;
        }

        /* Never reached there always is at least one supported mode */
        return 0;
}

/* initialize variables depending on type and decompressor */
void pwc_construct(struct pwc_device *pdev)
{
        if (DEVICE_USE_CODEC1(pdev->type)) {

                pdev->image_mask = 1 << PSZ_SQCIF | 1 << PSZ_QCIF | 1 << PSZ_CIF;
                pdev->vcinterface = 2;
                pdev->vendpoint = 4;
                pdev->frame_header_size = 0;
                pdev->frame_trailer_size = 0;

        } else if (DEVICE_USE_CODEC3(pdev->type)) {

                pdev->image_mask = 1 << PSZ_QSIF | 1 << PSZ_SIF | 1 << PSZ_VGA;
                pdev->vcinterface = 3;
                pdev->vendpoint = 5;
                pdev->frame_header_size = TOUCAM_HEADER_SIZE;
                pdev->frame_trailer_size = TOUCAM_TRAILER_SIZE;

        } else /* if (DEVICE_USE_CODEC2(pdev->type)) */ {

                pdev->image_mask = 1 << PSZ_SQCIF | 1 << PSZ_QSIF | 1 << PSZ_QCIF | 1 << PSZ_SIF | 1 << PSZ_CIF | 1 << PSZ_VGA;
                pdev->vcinterface = 3;
                pdev->vendpoint = 4;
                pdev->frame_header_size = 0;
                pdev->frame_trailer_size = 0;
        }
}