^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1) // SPDX-License-Identifier: GPL-2.0-or-later
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2) /* Linux driver for Philips webcam
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3) Decompression frontend.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4) (C) 1999-2003 Nemosoft Unv.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 5) (C) 2004-2006 Luc Saillard (luc@saillard.org)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 6)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 7) NOTE: this version of pwc is an unofficial (modified) release of pwc & pcwx
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 8) driver and thus may have bugs that are not present in the original version.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 9) Please send bug reports and support requests to <luc@saillard.org>.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 10) The decompression routines have been implemented by reverse-engineering the
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 11) Nemosoft binary pwcx module. Caveat emptor.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 12)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 13)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 14) vim: set ts=8:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 15) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 16)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 17) #include <asm/current.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 18) #include <asm/types.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 19)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 20) #include "pwc.h"
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 21) #include "pwc-dec1.h"
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 22) #include "pwc-dec23.h"
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 23)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 24) int pwc_decompress(struct pwc_device *pdev, struct pwc_frame_buf *fbuf)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 25) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 26) int n, line, col;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 27) void *yuv, *image;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 28) u16 *src;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 29) u16 *dsty, *dstu, *dstv;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 30)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 31) image = vb2_plane_vaddr(&fbuf->vb.vb2_buf, 0);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 32)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 33) yuv = fbuf->data + pdev->frame_header_size; /* Skip header */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 34)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 35) /* Raw format; that's easy... */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 36) if (pdev->pixfmt != V4L2_PIX_FMT_YUV420)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 37) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 38) struct pwc_raw_frame *raw_frame = image;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 39) raw_frame->type = cpu_to_le16(pdev->type);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 40) raw_frame->vbandlength = cpu_to_le16(pdev->vbandlength);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 41) /* cmd_buf is always 4 bytes, but sometimes, only the
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 42) * first 3 bytes is filled (Nala case). We can
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 43) * determine this using the type of the webcam */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 44) memcpy(raw_frame->cmd, pdev->cmd_buf, 4);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 45) memcpy(raw_frame+1, yuv, pdev->frame_size);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 46) vb2_set_plane_payload(&fbuf->vb.vb2_buf, 0,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 47) pdev->frame_size + sizeof(struct pwc_raw_frame));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 48) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 49) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 50)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 51) vb2_set_plane_payload(&fbuf->vb.vb2_buf, 0,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 52) pdev->width * pdev->height * 3 / 2);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 53)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 54) if (pdev->vbandlength == 0) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 55) /* Uncompressed mode.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 56) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 57) * We do some byte shuffling here to go from the
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 58) * native format to YUV420P.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 59) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 60) src = (u16 *)yuv;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 61) n = pdev->width * pdev->height;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 62) dsty = (u16 *)(image);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 63) dstu = (u16 *)(image + n);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 64) dstv = (u16 *)(image + n + n / 4);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 65)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 66) for (line = 0; line < pdev->height; line++) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 67) for (col = 0; col < pdev->width; col += 4) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 68) *dsty++ = *src++;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 69) *dsty++ = *src++;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 70) if (line & 1)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 71) *dstv++ = *src++;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 72) else
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 73) *dstu++ = *src++;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 74) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 75) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 76)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 77) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 78) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 79)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 80) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 81) * Compressed;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 82) * the decompressor routines will write the data in planar format
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 83) * immediately.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 84) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 85) if (DEVICE_USE_CODEC1(pdev->type)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 86)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 87) /* TODO & FIXME */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 88) PWC_ERROR("This chipset is not supported for now\n");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 89) return -ENXIO; /* No such device or address: missing decompressor */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 90)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 91) } else {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 92) pwc_dec23_decompress(pdev, yuv, image);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 93) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 94) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 95) }
Orange Pi5 kernel
Deprecated Linux kernel 5.10.110 for OrangePi 5/5B/5+ boards
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