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->service_lines, 0, sizeof(svbi->service_lines)); 100 svbi->service_set = 0; 101 /* we're done if raw VBI is active */ 102 if ((cx25840_read(client, 0x404) & 0x10) == 0) 103 return 0; 104 105 if (is_pal) { 106 for (i = 7; i <= 23; i++) { 107 u8 v = cx25840_read(client, 0x424 + i - 7); 108 109 svbi->service_lines[0][i] = lcr2vbi[v >> 4]; 110 svbi->service_lines[1][i] = lcr2vbi[v & 0xf]; 111 svbi->service_set |= svbi->service_lines[0][i] | 112 svbi->service_lines[1][i]; 113 } 114 } else { 115 for (i = 10; i <= 21; i++) { 116 u8 v = cx25840_read(client, 0x424 + i - 10); 117 118 svbi->service_lines[0][i] = lcr2vbi[v >> 4]; 119 svbi->service_lines[1][i] = lcr2vbi[v & 0xf]; 120 svbi->service_set |= svbi->service_lines[0][i] | 121 svbi->service_lines[1][i]; 122 } 123 } 124 return 0; 125} 126 127int cx25840_s_raw_fmt(struct v4l2_subdev *sd, struct v4l2_vbi_format *fmt) 128{ 129 struct i2c_client *client = v4l2_get_subdevdata(sd); 130 struct cx25840_state *state = to_state(sd); 131 int is_pal = !(state->std & V4L2_STD_525_60); 132 int vbi_offset = is_pal ? 1 : 0; 133 134 /* Setup standard */ 135 cx25840_std_setup(client); 136 137 /* VBI Offset */ 138 cx25840_write(client, 0x47f, vbi_offset); 139 cx25840_write(client, 0x404, 0x2e); 140 return 0; 141} 142 143int cx25840_s_sliced_fmt(struct v4l2_subdev *sd, struct v4l2_sliced_vbi_format *svbi) 144{ 145 struct i2c_client *client = v4l2_get_subdevdata(sd); 146 struct cx25840_state *state = to_state(sd); 147 int is_pal = !(state->std & V4L2_STD_525_60); 148 int vbi_offset = is_pal ? 1 : 0; 149 int i, x; 150 u8 lcr[24]; 151 152 for (x = 0; x <= 23; x++) 153 lcr[x] = 0x00; 154 155 /* Setup standard */ 156 cx25840_std_setup(client); 157 158 /* Sliced VBI */ 159 cx25840_write(client, 0x404, 0x32); /* Ancillary data */ 160 cx25840_write(client, 0x406, 0x13); 161 cx25840_write(client, 0x47f, vbi_offset); 162 163 if (is_pal) { 164 for (i = 0; i <= 6; i++) 165 svbi->service_lines[0][i] = 166 svbi->service_lines[1][i] = 0; 167 } else { 168 for (i = 0; i <= 9; i++) 169 svbi->service_lines[0][i] = 170 svbi->service_lines[1][i] = 0; 171 172 for (i = 22; i <= 23; i++) 173 svbi->service_lines[0][i] = 174 svbi->service_lines[1][i] = 0; 175 } 176 177 for (i = 7; i <= 23; i++) { 178 for (x = 0; x <= 1; x++) { 179 switch (svbi->service_lines[1-x][i]) { 180 case V4L2_SLICED_TELETEXT_B: 181 lcr[i] |= 1 << (4 * x); 182 break; 183 case V4L2_SLICED_WSS_625: 184 lcr[i] |= 4 << (4 * x); 185 break; 186 case V4L2_SLICED_CAPTION_525: 187 lcr[i] |= 6 << (4 * x); 188 break; 189 case V4L2_SLICED_VPS: 190 lcr[i] |= 9 << (4 * x); 191 break; 192 } 193 } 194 } 195 196 if (is_pal) { 197 for (x = 1, i = 0x424; i <= 0x434; i++, x++) 198 cx25840_write(client, i, lcr[6 + x]); 199 } else { 200 for (x = 1, i = 0x424; i <= 0x430; i++, x++) 201 cx25840_write(client, i, lcr[9 + x]); 202 for (i = 0x431; i <= 0x434; i++) 203 cx25840_write(client, i, 0); 204 } 205 206 cx25840_write(client, 0x43c, 0x16); 207 cx25840_write(client, 0x474, is_pal ? 0x2a : 0x22); 208 return 0; 209} 210 211int cx25840_decode_vbi_line(struct v4l2_subdev *sd, struct v4l2_decode_vbi_line *vbi) 212{ 213 struct cx25840_state *state = to_state(sd); 214 u8 *p = vbi->p; 215 int id1, id2, l, err = 0; 216 217 if (p[0] || p[1] != 0xff || p[2] != 0xff || 218 (p[3] != 0x55 && p[3] != 0x91)) { 219 vbi->line = vbi->type = 0; 220 return 0; 221 } 222 223 p += 4; 224 id1 = p[-1]; 225 id2 = p[0] & 0xf; 226 l = p[2] & 0x3f; 227 l += state->vbi_line_offset; 228 p += 4; 229 230 switch (id2) { 231 case 1: 232 id2 = V4L2_SLICED_TELETEXT_B; 233 break; 234 case 4: 235 id2 = V4L2_SLICED_WSS_625; 236 break; 237 case 6: 238 id2 = V4L2_SLICED_CAPTION_525; 239 err = !odd_parity(p[0]) || !odd_parity(p[1]); 240 break; 241 case 9: 242 id2 = V4L2_SLICED_VPS; 243 if (decode_vps(p, p) != 0) 244 err = 1; 245 break; 246 default: 247 id2 = 0; 248 err = 1; 249 break; 250 } 251 252 vbi->type = err ? 0 : id2; 253 vbi->line = err ? 0 : l; 254 vbi->is_second_field = err ? 0 : (id1 == 0x55); 255 vbi->p = p; 256 return 0; 257} 258