diff options
Diffstat (limited to 'drivers/media/pci/cx18/cx18-av-vbi.c')
| -rw-r--r-- | drivers/media/pci/cx18/cx18-av-vbi.c | 299 |
1 files changed, 299 insertions, 0 deletions
diff --git a/drivers/media/pci/cx18/cx18-av-vbi.c b/drivers/media/pci/cx18/cx18-av-vbi.c new file mode 100644 index 000000000..a0d465924 --- /dev/null +++ b/drivers/media/pci/cx18/cx18-av-vbi.c @@ -0,0 +1,299 @@ +// SPDX-License-Identifier: GPL-2.0-or-later +/* + * cx18 ADEC VBI functions + * + * Derived from cx25840-vbi.c + * + * Copyright (C) 2007 Hans Verkuil <hverkuil@xs4all.nl> + */ + + +#include "cx18-driver.h" + +/* + * For sliced VBI output, we set up to use VIP-1.1, 8-bit mode, + * NN counts 1 byte Dwords, an IDID with the VBI line # in it. + * Thus, according to the VIP-2 Spec, our VBI ancillary data lines + * (should!) look like: + * 4 byte EAV code: 0xff 0x00 0x00 0xRP + * unknown number of possible idle bytes + * 3 byte Anc data preamble: 0x00 0xff 0xff + * 1 byte data identifier: ne010iii (parity bits, 010, DID bits) + * 1 byte secondary data id: nessssss (parity bits, SDID bits) + * 1 byte data word count: necccccc (parity bits, NN Dword count) + * 2 byte Internal DID: VBI-line-# 0x80 + * NN data bytes + * 1 byte checksum + * Fill bytes needed to fil out to 4*NN bytes of payload + * + * The RP codes for EAVs when in VIP-1.1 mode, not in raw mode, & + * in the vertical blanking interval are: + * 0xb0 (Task 0 VerticalBlank HorizontalBlank 0 0 0 0) + * 0xf0 (Task EvenField VerticalBlank HorizontalBlank 0 0 0 0) + * + * Since the V bit is only allowed to toggle in the EAV RP code, just + * before the first active region line and for active lines, they are: + * 0x90 (Task 0 0 HorizontalBlank 0 0 0 0) + * 0xd0 (Task EvenField 0 HorizontalBlank 0 0 0 0) + * + * The user application DID bytes we care about are: + * 0x91 (1 0 010 0 !ActiveLine AncDataPresent) + * 0x55 (0 1 010 2ndField !ActiveLine AncDataPresent) + * + */ +static const u8 sliced_vbi_did[2] = { 0x91, 0x55 }; + +struct vbi_anc_data { + /* u8 eav[4]; */ + /* u8 idle[]; Variable number of idle bytes */ + u8 preamble[3]; + u8 did; + u8 sdid; + u8 data_count; + u8 idid[2]; + u8 payload[1]; /* data_count of payload */ + /* u8 checksum; */ + /* u8 fill[]; Variable number of fill bytes */ +}; + +static int odd_parity(u8 c) +{ + c ^= (c >> 4); + c ^= (c >> 2); + c ^= (c >> 1); + + return c & 1; +} + +static int decode_vps(u8 *dst, u8 *p) +{ + static const u8 biphase_tbl[] = { + 0xf0, 0x78, 0x70, 0xf0, 0xb4, 0x3c, 0x34, 0xb4, + 0xb0, 0x38, 0x30, 0xb0, 0xf0, 0x78, 0x70, 0xf0, + 0xd2, 0x5a, 0x52, 0xd2, 0x96, 0x1e, 0x16, 0x96, + 0x92, 0x1a, 0x12, 0x92, 0xd2, 0x5a, 0x52, 0xd2, + 0xd0, 0x58, 0x50, 0xd0, 0x94, 0x1c, 0x14, 0x94, + 0x90, 0x18, 0x10, 0x90, 0xd0, 0x58, 0x50, 0xd0, + 0xf0, 0x78, 0x70, 0xf0, 0xb4, 0x3c, 0x34, 0xb4, + 0xb0, 0x38, 0x30, 0xb0, 0xf0, 0x78, 0x70, 0xf0, + 0xe1, 0x69, 0x61, 0xe1, 0xa5, 0x2d, 0x25, 0xa5, + 0xa1, 0x29, 0x21, 0xa1, 0xe1, 0x69, 0x61, 0xe1, + 0xc3, 0x4b, 0x43, 0xc3, 0x87, 0x0f, 0x07, 0x87, + 0x83, 0x0b, 0x03, 0x83, 0xc3, 0x4b, 0x43, 0xc3, + 0xc1, 0x49, 0x41, 0xc1, 0x85, 0x0d, 0x05, 0x85, + 0x81, 0x09, 0x01, 0x81, 0xc1, 0x49, 0x41, 0xc1, + 0xe1, 0x69, 0x61, 0xe1, 0xa5, 0x2d, 0x25, 0xa5, + 0xa1, 0x29, 0x21, 0xa1, 0xe1, 0x69, 0x61, 0xe1, + 0xe0, 0x68, 0x60, 0xe0, 0xa4, 0x2c, 0x24, 0xa4, + 0xa0, 0x28, 0x20, 0xa0, 0xe0, 0x68, 0x60, 0xe0, + 0xc2, 0x4a, 0x42, 0xc2, 0x86, 0x0e, 0x06, 0x86, + 0x82, 0x0a, 0x02, 0x82, 0xc2, 0x4a, 0x42, 0xc2, + 0xc0, 0x48, 0x40, 0xc0, 0x84, 0x0c, 0x04, 0x84, + 0x80, 0x08, 0x00, 0x80, 0xc0, 0x48, 0x40, 0xc0, + 0xe0, 0x68, 0x60, 0xe0, 0xa4, 0x2c, 0x24, 0xa4, + 0xa0, 0x28, 0x20, 0xa0, 0xe0, 0x68, 0x60, 0xe0, + 0xf0, 0x78, 0x70, 0xf0, 0xb4, 0x3c, 0x34, 0xb4, + 0xb0, 0x38, 0x30, 0xb0, 0xf0, 0x78, 0x70, 0xf0, + 0xd2, 0x5a, 0x52, 0xd2, 0x96, 0x1e, 0x16, 0x96, + 0x92, 0x1a, 0x12, 0x92, 0xd2, 0x5a, 0x52, 0xd2, + 0xd0, 0x58, 0x50, 0xd0, 0x94, 0x1c, 0x14, 0x94, + 0x90, 0x18, 0x10, 0x90, 0xd0, 0x58, 0x50, 0xd0, + 0xf0, 0x78, 0x70, 0xf0, 0xb4, 0x3c, 0x34, 0xb4, + 0xb0, 0x38, 0x30, 0xb0, 0xf0, 0x78, 0x70, 0xf0, + }; + + u8 c, err = 0; + int i; + + for (i = 0; i < 2 * 13; i += 2) { + err |= biphase_tbl[p[i]] | biphase_tbl[p[i + 1]]; + c = (biphase_tbl[p[i + 1]] & 0xf) | + ((biphase_tbl[p[i]] & 0xf) << 4); + dst[i / 2] = c; + } + + return err & 0xf0; +} + +int cx18_av_g_sliced_fmt(struct v4l2_subdev *sd, struct v4l2_sliced_vbi_format *svbi) +{ + struct cx18 *cx = v4l2_get_subdevdata(sd); + struct cx18_av_state *state = &cx->av_state; + static const u16 lcr2vbi[] = { + 0, V4L2_SLICED_TELETEXT_B, 0, /* 1 */ + 0, V4L2_SLICED_WSS_625, 0, /* 4 */ + V4L2_SLICED_CAPTION_525, /* 6 */ + 0, 0, V4L2_SLICED_VPS, 0, 0, /* 9 */ + 0, 0, 0, 0 + }; + int is_pal = !(state->std & V4L2_STD_525_60); + int i; + + memset(svbi->service_lines, 0, sizeof(svbi->service_lines)); + svbi->service_set = 0; + + /* we're done if raw VBI is active */ + if ((cx18_av_read(cx, 0x404) & 0x10) == 0) + return 0; + + if (is_pal) { + for (i = 7; i <= 23; i++) { + u8 v = cx18_av_read(cx, 0x424 + i - 7); + + svbi->service_lines[0][i] = lcr2vbi[v >> 4]; + svbi->service_lines[1][i] = lcr2vbi[v & 0xf]; + svbi->service_set |= svbi->service_lines[0][i] | + svbi->service_lines[1][i]; + } + } else { + for (i = 10; i <= 21; i++) { + u8 v = cx18_av_read(cx, 0x424 + i - 10); + + svbi->service_lines[0][i] = lcr2vbi[v >> 4]; + svbi->service_lines[1][i] = lcr2vbi[v & 0xf]; + svbi->service_set |= svbi->service_lines[0][i] | + svbi->service_lines[1][i]; + } + } + return 0; +} + +int cx18_av_s_raw_fmt(struct v4l2_subdev *sd, struct v4l2_vbi_format *fmt) +{ + struct cx18 *cx = v4l2_get_subdevdata(sd); + struct cx18_av_state *state = &cx->av_state; + + /* Setup standard */ + cx18_av_std_setup(cx); + + /* VBI Offset */ + cx18_av_write(cx, 0x47f, state->slicer_line_delay); + cx18_av_write(cx, 0x404, 0x2e); + return 0; +} + +int cx18_av_s_sliced_fmt(struct v4l2_subdev *sd, struct v4l2_sliced_vbi_format *svbi) +{ + struct cx18 *cx = v4l2_get_subdevdata(sd); + struct cx18_av_state *state = &cx->av_state; + int is_pal = !(state->std & V4L2_STD_525_60); + int i, x; + u8 lcr[24]; + + for (x = 0; x <= 23; x++) + lcr[x] = 0x00; + + /* Setup standard */ + cx18_av_std_setup(cx); + + /* Sliced VBI */ + cx18_av_write(cx, 0x404, 0x32); /* Ancillary data */ + cx18_av_write(cx, 0x406, 0x13); + cx18_av_write(cx, 0x47f, state->slicer_line_delay); + + /* Force impossible lines to 0 */ + if (is_pal) { + for (i = 0; i <= 6; i++) + svbi->service_lines[0][i] = + svbi->service_lines[1][i] = 0; + } else { + for (i = 0; i <= 9; i++) + svbi->service_lines[0][i] = + svbi->service_lines[1][i] = 0; + + for (i = 22; i <= 23; i++) + svbi->service_lines[0][i] = + svbi->service_lines[1][i] = 0; + } + + /* Build register values for requested service lines */ + for (i = 7; i <= 23; i++) { + for (x = 0; x <= 1; x++) { + switch (svbi->service_lines[1-x][i]) { + case V4L2_SLICED_TELETEXT_B: + lcr[i] |= 1 << (4 * x); + break; + case V4L2_SLICED_WSS_625: + lcr[i] |= 4 << (4 * x); + break; + case V4L2_SLICED_CAPTION_525: + lcr[i] |= 6 << (4 * x); + break; + case V4L2_SLICED_VPS: + lcr[i] |= 9 << (4 * x); + break; + } + } + } + + if (is_pal) { + for (x = 1, i = 0x424; i <= 0x434; i++, x++) + cx18_av_write(cx, i, lcr[6 + x]); + } else { + for (x = 1, i = 0x424; i <= 0x430; i++, x++) + cx18_av_write(cx, i, lcr[9 + x]); + for (i = 0x431; i <= 0x434; i++) + cx18_av_write(cx, i, 0); + } + + cx18_av_write(cx, 0x43c, 0x16); + /* Should match vblank set in cx18_av_std_setup() */ + cx18_av_write(cx, 0x474, is_pal ? 38 : 26); + return 0; +} + +int cx18_av_decode_vbi_line(struct v4l2_subdev *sd, + struct v4l2_decode_vbi_line *vbi) +{ + struct cx18 *cx = v4l2_get_subdevdata(sd); + struct cx18_av_state *state = &cx->av_state; + struct vbi_anc_data *anc = (struct vbi_anc_data *)vbi->p; + u8 *p; + int did, sdid, l, err = 0; + + /* + * Check for the ancillary data header for sliced VBI + */ + if (anc->preamble[0] || + anc->preamble[1] != 0xff || anc->preamble[2] != 0xff || + (anc->did != sliced_vbi_did[0] && + anc->did != sliced_vbi_did[1])) { + vbi->line = vbi->type = 0; + return 0; + } + + did = anc->did; + sdid = anc->sdid & 0xf; + l = anc->idid[0] & 0x3f; + l += state->slicer_line_offset; + p = anc->payload; + + /* Decode the SDID set by the slicer */ + switch (sdid) { + case 1: + sdid = V4L2_SLICED_TELETEXT_B; + break; + case 4: + sdid = V4L2_SLICED_WSS_625; + break; + case 6: + sdid = V4L2_SLICED_CAPTION_525; + err = !odd_parity(p[0]) || !odd_parity(p[1]); + break; + case 9: + sdid = V4L2_SLICED_VPS; + if (decode_vps(p, p) != 0) + err = 1; + break; + default: + sdid = 0; + err = 1; + break; + } + + vbi->type = err ? 0 : sdid; + vbi->line = err ? 0 : l; + vbi->is_second_field = err ? 0 : (did == sliced_vbi_did[1]); + vbi->p = p; + return 0; +} |