1/* cx25840 VBI functions 2 * 3 * This program is free software; you can redistribute it and/or 4 * modify it under the terms of the GNU General Public License 5 * as published by the Free Software Foundation; either version 2 6 * of the License, or (at your option) any later version. 7 * 8 * This program is distributed in the hope that it will be useful, 9 * but WITHOUT ANY WARRANTY; without even the implied warranty of 10 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 11 * GNU General Public License for more details. 12 * 13 * You should have received a copy of the GNU General Public License 14 * along with this program; if not, write to the Free Software 15 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA. 16 */ 17 18 19#include <linux/videodev2.h> 20#include <linux/i2c.h> 21#include <media/v4l2-common.h> 22#include <media/cx25840.h> 23 24#include "cx25840-core.h" 25 26static int odd_parity(u8 c) 27{ 28 c ^= (c >> 4); 29 c ^= (c >> 2); 30 c ^= (c >> 1); 31 32 return c & 1; 33} 34 35static int decode_vps(u8 * dst, u8 * p) 36{ 37 static const u8 biphase_tbl[] = { 38 0xf0, 0x78, 0x70, 0xf0, 0xb4, 0x3c, 0x34, 0xb4, 39 0xb0, 0x38, 0x30, 0xb0, 0xf0, 0x78, 0x70, 0xf0, 40 0xd2, 0x5a, 0x52, 0xd2, 0x96, 0x1e, 0x16, 0x96, 41 0x92, 0x1a, 0x12, 0x92, 0xd2, 0x5a, 0x52, 0xd2, 42 0xd0, 0x58, 0x50, 0xd0, 0x94, 0x1c, 0x14, 0x94, 43 0x90, 0x18, 0x10, 0x90, 0xd0, 0x58, 0x50, 0xd0, 44 0xf0, 0x78, 0x70, 0xf0, 0xb4, 0x3c, 0x34, 0xb4, 45 0xb0, 0x38, 0x30, 0xb0, 0xf0, 0x78, 0x70, 0xf0, 46 0xe1, 0x69, 0x61, 0xe1, 0xa5, 0x2d, 0x25, 0xa5, 47 0xa1, 0x29, 0x21, 0xa1, 0xe1, 0x69, 0x61, 0xe1, 48 0xc3, 0x4b, 0x43, 0xc3, 0x87, 0x0f, 0x07, 0x87, 49 0x83, 0x0b, 0x03, 0x83, 0xc3, 0x4b, 0x43, 0xc3, 50 0xc1, 0x49, 0x41, 0xc1, 0x85, 0x0d, 0x05, 0x85, 51 0x81, 0x09, 0x01, 0x81, 0xc1, 0x49, 0x41, 0xc1, 52 0xe1, 0x69, 0x61, 0xe1, 0xa5, 0x2d, 0x25, 0xa5, 53 0xa1, 0x29, 0x21, 0xa1, 0xe1, 0x69, 0x61, 0xe1, 54 0xe0, 0x68, 0x60, 0xe0, 0xa4, 0x2c, 0x24, 0xa4, 55 0xa0, 0x28, 0x20, 0xa0, 0xe0, 0x68, 0x60, 0xe0, 56 0xc2, 0x4a, 0x42, 0xc2, 0x86, 0x0e, 0x06, 0x86, 57 0x82, 0x0a, 0x02, 0x82, 0xc2, 0x4a, 0x42, 0xc2, 58 0xc0, 0x48, 0x40, 0xc0, 0x84, 0x0c, 0x04, 0x84, 59 0x80, 0x08, 0x00, 0x80, 0xc0, 0x48, 0x40, 0xc0, 60 0xe0, 0x68, 0x60, 0xe0, 0xa4, 0x2c, 0x24, 0xa4, 61 0xa0, 0x28, 0x20, 0xa0, 0xe0, 0x68, 0x60, 0xe0, 62 0xf0, 0x78, 0x70, 0xf0, 0xb4, 0x3c, 0x34, 0xb4, 63 0xb0, 0x38, 0x30, 0xb0, 0xf0, 0x78, 0x70, 0xf0, 64 0xd2, 0x5a, 0x52, 0xd2, 0x96, 0x1e, 0x16, 0x96, 65 0x92, 0x1a, 0x12, 0x92, 0xd2, 0x5a, 0x52, 0xd2, 66 0xd0, 0x58, 0x50, 0xd0, 0x94, 0x1c, 0x14, 0x94, 67 0x90, 0x18, 0x10, 0x90, 0xd0, 0x58, 0x50, 0xd0, 68 0xf0, 0x78, 0x70, 0xf0, 0xb4, 0x3c, 0x34, 0xb4, 69 0xb0, 0x38, 0x30, 0xb0, 0xf0, 0x78, 0x70, 0xf0, 70 }; 71 72 u8 c, err = 0; 73 int i; 74 75 for (i = 0; i < 2 * 13; i += 2) { 76 err |= biphase_tbl[p[i]] | biphase_tbl[p[i + 1]]; 77 c = (biphase_tbl[p[i + 1]] & 0xf) | 78 ((biphase_tbl[p[i]] & 0xf) << 4); 79 dst[i / 2] = c; 80 } 81 82 return err & 0xf0; 83} 84 85int cx25840_g_sliced_fmt(struct v4l2_subdev *sd, struct v4l2_sliced_vbi_format *svbi) 86{ 87 struct i2c_client *client = v4l2_get_subdevdata(sd); 88 struct cx25840_state *state = to_state(sd); 89 static const u16 lcr2vbi[] = { 90 0, V4L2_SLICED_TELETEXT_B, 0, /* 1 */ 91 0, V4L2_SLICED_WSS_625, 0, /* 4 */ 92 V4L2_SLICED_CAPTION_525, /* 6 */ 93 0, 0, V4L2_SLICED_VPS, 0, 0, /* 9 */ 94 0, 0, 0, 0 95 }; 96 int is_pal = !(state->std & V4L2_STD_525_60); 97 int i; 98 99 memset(svbi, 0, sizeof(*svbi)); 100 /* we're done if raw VBI is active */ 101 if ((cx25840_read(client, 0x404) & 0x10) == 0) 102 return 0; 103 104 if (is_pal) { 105 for (i = 7; i <= 23; i++) { 106 u8 v = cx25840_read(client, 0x424 + i - 7); 107 108 svbi->service_lines[0][i] = lcr2vbi[v >> 4]; 109 svbi->service_lines[1][i] = lcr2vbi[v & 0xf]; 110 svbi->service_set |= svbi->service_lines[0][i] | 111 svbi->service_lines[1][i]; 112 } 113 } else { 114 for (i = 10; i <= 21; i++) { 115 u8 v = cx25840_read(client, 0x424 + i - 10); 116 117 svbi->service_lines[0][i] = lcr2vbi[v >> 4]; 118 svbi->service_lines[1][i] = lcr2vbi[v & 0xf]; 119 svbi->service_set |= svbi->service_lines[0][i] | 120 svbi->service_lines[1][i]; 121 } 122 } 123 return 0; 124} 125 126int cx25840_s_raw_fmt(struct v4l2_subdev *sd, struct v4l2_vbi_format *fmt) 127{ 128 struct i2c_client *client = v4l2_get_subdevdata(sd); 129 struct cx25840_state *state = to_state(sd); 130 int is_pal = !(state->std & V4L2_STD_525_60); 131 int vbi_offset = is_pal ? 1 : 0; 132 133 /* Setup standard */ 134 cx25840_std_setup(client); 135 136 /* VBI Offset */ 137 cx25840_write(client, 0x47f, vbi_offset); 138 cx25840_write(client, 0x404, 0x2e); 139 return 0; 140} 141 142int cx25840_s_sliced_fmt(struct v4l2_subdev *sd, struct v4l2_sliced_vbi_format *svbi) 143{ 144 struct i2c_client *client = v4l2_get_subdevdata(sd); 145 struct cx25840_state *state = to_state(sd); 146 int is_pal = !(state->std & V4L2_STD_525_60); 147 int vbi_offset = is_pal ? 1 : 0; 148 int i, x; 149 u8 lcr[24]; 150 151 for (x = 0; x <= 23; x++) 152 lcr[x] = 0x00; 153 154 /* Setup standard */ 155 cx25840_std_setup(client); 156 157 /* Sliced VBI */ 158 cx25840_write(client, 0x404, 0x32); /* Ancillary data */ 159 cx25840_write(client, 0x406, 0x13); 160 cx25840_write(client, 0x47f, vbi_offset); 161 162 if (is_pal) { 163 for (i = 0; i <= 6; i++) 164 svbi->service_lines[0][i] = 165 svbi->service_lines[1][i] = 0; 166 } else { 167 for (i = 0; i <= 9; i++) 168 svbi->service_lines[0][i] = 169 svbi->service_lines[1][i] = 0; 170 171 for (i = 22; i <= 23; i++) 172 svbi->service_lines[0][i] = 173 svbi->service_lines[1][i] = 0; 174 } 175 176 for (i = 7; i <= 23; i++) { 177 for (x = 0; x <= 1; x++) { 178 switch (svbi->service_lines[1-x][i]) { 179 case V4L2_SLICED_TELETEXT_B: 180 lcr[i] |= 1 << (4 * x); 181 break; 182 case V4L2_SLICED_WSS_625: 183 lcr[i] |= 4 << (4 * x); 184 break; 185 case V4L2_SLICED_CAPTION_525: 186 lcr[i] |= 6 << (4 * x); 187 break; 188 case V4L2_SLICED_VPS: 189 lcr[i] |= 9 << (4 * x); 190 break; 191 } 192 } 193 } 194 195 if (is_pal) { 196 for (x = 1, i = 0x424; i <= 0x434; i++, x++) 197 cx25840_write(client, i, lcr[6 + x]); 198 } else { 199 for (x = 1, i = 0x424; i <= 0x430; i++, x++) 200 cx25840_write(client, i, lcr[9 + x]); 201 for (i = 0x431; i <= 0x434; i++) 202 cx25840_write(client, i, 0); 203 } 204 205 cx25840_write(client, 0x43c, 0x16); 206 cx25840_write(client, 0x474, is_pal ? 0x2a : 0x22); 207 return 0; 208} 209 210int cx25840_decode_vbi_line(struct v4l2_subdev *sd, struct v4l2_decode_vbi_line *vbi) 211{ 212 struct cx25840_state *state = to_state(sd); 213 u8 *p = vbi->p; 214 int id1, id2, l, err = 0; 215 216 if (p[0] || p[1] != 0xff || p[2] != 0xff || 217 (p[3] != 0x55 && p[3] != 0x91)) { 218 vbi->line = vbi->type = 0; 219 return 0; 220 } 221 222 p += 4; 223 id1 = p[-1]; 224 id2 = p[0] & 0xf; 225 l = p[2] & 0x3f; 226 l += state->vbi_line_offset; 227 p += 4; 228 229 switch (id2) { 230 case 1: 231 id2 = V4L2_SLICED_TELETEXT_B; 232 break; 233 case 4: 234 id2 = V4L2_SLICED_WSS_625; 235 break; 236 case 6: 237 id2 = V4L2_SLICED_CAPTION_525; 238 err = !odd_parity(p[0]) || !odd_parity(p[1]); 239 break; 240 case 9: 241 id2 = V4L2_SLICED_VPS; 242 if (decode_vps(p, p) != 0) 243 err = 1; 244 break; 245 default: 246 id2 = 0; 247 err = 1; 248 break; 249 } 250 251 vbi->type = err ? 0 : id2; 252 vbi->line = err ? 0 : l; 253 vbi->is_second_field = err ? 0 : (id1 == 0x55); 254 vbi->p = p; 255 return 0; 256} 257