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 18 const 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_ */ 29 int 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 */ 55 void 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