LXR linux-old/drivers/usb/pwc-misc.c

   1/* Linux driver for Philips webcam 
   2   Various miscellaneous functions and tables.
   3   (C) 1999-2003 Nemosoft Unv. (webcam@smcc.demon.nl)
   4
   5   This program is free software; you can redistribute it and/or modify
   6   it under the terms of the GNU General Public License as published by
   7   the Free Software Foundation; either version 2 of the License, or
   8   (at your option) any later version.
   9
  10   This program is distributed in the hope that it will be useful,
  11   but WITHOUT ANY WARRANTY; without even the implied warranty of
  12   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  13   GNU General Public License for more details.
  14
  15   You should have received a copy of the GNU General Public License
  16   along with this program; if not, write to the Free Software
  17   Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
  18*/  
  19
  20#include <linux/slab.h>
  21
  22#include "pwc.h"
  23
  24struct pwc_coord pwc_image_sizes[PSZ_MAX] = 
  25{
  26        { 128,  96, 0 },
  27        { 160, 120, 0 },
  28        { 176, 144, 0 },
  29        { 320, 240, 0 },
  30        { 352, 288, 0 },
  31        { 640, 480, 0 },
  32};
  33
  34/* x,y -> PSZ_ */
  35int pwc_decode_size(struct pwc_device *pdev, int width, int height)
  36{
  37        int i, find;
  38
  39        /* Make sure we don't go beyond our max size */
  40        if (width > pdev->view_max.x || height > pdev->view_max.y)
  41                return -1;
  42        /* Find the largest size supported by the camera that fits into the
  43           requested size. 
  44         */
  45        find = -1;
  46        for (i = 0; i < PSZ_MAX; i++) {
  47                if (pdev->image_mask & (1 << i)) {
  48                        if (pwc_image_sizes[i].x <= width && pwc_image_sizes[i].y <= height)
  49                                find = i;
  50                }
  51        }
  52        return find;
  53}
  54/* initialize variables depending on type */
  55void pwc_construct(struct pwc_device *pdev)
  56{
  57        switch(pdev->type) {
  58        case 645:
  59        case 646:
  60                pdev->view_min.x = 128;
  61                pdev->view_min.y =  96;
  62                pdev->view_max.x = 352;
  63                pdev->view_max.y = 288;
  64                pdev->image_mask = 1 << PSZ_SQCIF | 1 << PSZ_QCIF | 1 << PSZ_CIF;
  65                pdev->vcinterface = 2;
  66                pdev->vendpoint = 4;
  67                pdev->frame_header_size = 0;
  68                pdev->frame_trailer_size = 0;
  69                break;
  70        case 675:
  71        case 680:
  72        case 690:
  73                pdev->view_min.x = 128;
  74                pdev->view_min.y =  96;
  75                pdev->view_max.x = 640;
  76                pdev->view_max.y = 480;
  77                pdev->image_mask = 1 << PSZ_SQCIF | 1 << PSZ_QSIF | 1 << PSZ_QCIF | 1 << PSZ_SIF | 1 << PSZ_CIF | 1 << PSZ_VGA;
  78                pdev->vcinterface = 3;
  79                pdev->vendpoint = 4;
  80                pdev->frame_header_size = 0;
  81                pdev->frame_trailer_size = 0;
  82                break;
  83        case 720:
  84        case 730:
  85        case 740:
  86        case 750:
  87                pdev->view_min.x = 160;
  88                pdev->view_min.y = 120;
  89                pdev->view_max.x = 640;
  90                pdev->view_max.y = 480;
  91                pdev->image_mask = 1 << PSZ_QSIF | 1 << PSZ_SIF | 1 << PSZ_VGA;
  92                pdev->vcinterface = 3;
  93                pdev->vendpoint = 5;
  94                pdev->frame_header_size = TOUCAM_HEADER_SIZE;
  95                pdev->frame_trailer_size = TOUCAM_TRAILER_SIZE;
  96                break;
  97        }
  98        pdev->view_min.size = pdev->view_min.x * pdev->view_min.y;
  99        pdev->view_max.size = pdev->view_max.x * pdev->view_max.y;
 100        /* length of image, in YUV format */
 101        pdev->len_per_image = (pdev->view_max.size * 3) / 2;
 102}
 103
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