Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1 | /* |
| 2 | * Driver for the SAA5246A or SAA5281 Teletext (=Videotext) decoder chips from |
| 3 | * Philips. |
| 4 | * |
| 5 | * Only capturing of Teletext pages is tested. The videotext chips also have a |
| 6 | * TV output but my hardware doesn't use it. For this reason this driver does |
| 7 | * not support changing any TV display settings. |
| 8 | * |
| 9 | * Copyright (C) 2004 Michael Geng <linux@MichaelGeng.de> |
| 10 | * |
| 11 | * Derived from |
| 12 | * |
| 13 | * saa5249 driver |
| 14 | * Copyright (C) 1998 Richard Guenther |
| 15 | * <richard.guenther@student.uni-tuebingen.de> |
| 16 | * |
| 17 | * with changes by |
| 18 | * Alan Cox <Alan.Cox@linux.org> |
| 19 | * |
| 20 | * and |
| 21 | * |
| 22 | * vtx.c |
| 23 | * Copyright (C) 1994-97 Martin Buck <martin-2.buck@student.uni-ulm.de> |
| 24 | * |
| 25 | * This program is free software; you can redistribute it and/or modify |
| 26 | * it under the terms of the GNU General Public License as published by |
| 27 | * the Free Software Foundation; either version 2 of the License, or |
| 28 | * (at your option) any later version. |
| 29 | * |
| 30 | * This program is distributed in the hope that it will be useful, |
| 31 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 32 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| 33 | * GNU General Public License for more details. |
| 34 | * |
| 35 | * You should have received a copy of the GNU General Public License |
| 36 | * along with this program; if not, write to the Free Software |
| 37 | * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, |
| 38 | * USA. |
| 39 | */ |
| 40 | |
| 41 | #include <linux/module.h> |
| 42 | #include <linux/kernel.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 43 | #include <linux/mm.h> |
| 44 | #include <linux/init.h> |
| 45 | #include <linux/i2c.h> |
| 46 | #include <linux/videotext.h> |
| 47 | #include <linux/videodev.h> |
Mauro Carvalho Chehab | 5e87efa | 2006-06-05 10:26:32 -0300 | [diff] [blame] | 48 | #include <media/v4l2-common.h> |
Ingo Molnar | 3593cab | 2006-02-07 06:49:14 -0200 | [diff] [blame] | 49 | #include <linux/mutex.h> |
| 50 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 51 | #include "saa5246a.h" |
| 52 | |
| 53 | MODULE_AUTHOR("Michael Geng <linux@MichaelGeng.de>"); |
| 54 | MODULE_DESCRIPTION("Philips SAA5246A, SAA5281 Teletext decoder driver"); |
| 55 | MODULE_LICENSE("GPL"); |
| 56 | |
| 57 | struct saa5246a_device |
| 58 | { |
| 59 | u8 pgbuf[NUM_DAUS][VTX_VIRTUALSIZE]; |
| 60 | int is_searching[NUM_DAUS]; |
| 61 | struct i2c_client *client; |
Ingo Molnar | 3593cab | 2006-02-07 06:49:14 -0200 | [diff] [blame] | 62 | struct mutex lock; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 63 | }; |
| 64 | |
| 65 | static struct video_device saa_template; /* Declared near bottom */ |
| 66 | |
| 67 | /* Addresses to scan */ |
| 68 | static unsigned short normal_i2c[] = { I2C_ADDRESS, I2C_CLIENT_END }; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 69 | I2C_CLIENT_INSMOD; |
| 70 | |
| 71 | static struct i2c_client client_template; |
| 72 | |
| 73 | static int saa5246a_attach(struct i2c_adapter *adap, int addr, int kind) |
| 74 | { |
| 75 | int pgbuf; |
| 76 | int err; |
| 77 | struct i2c_client *client; |
| 78 | struct video_device *vd; |
| 79 | struct saa5246a_device *t; |
| 80 | |
| 81 | printk(KERN_INFO "saa5246a: teletext chip found.\n"); |
| 82 | client=kmalloc(sizeof(*client), GFP_KERNEL); |
| 83 | if(client==NULL) |
| 84 | return -ENOMEM; |
| 85 | client_template.adapter = adap; |
| 86 | client_template.addr = addr; |
| 87 | memcpy(client, &client_template, sizeof(*client)); |
Panagiotis Issaris | 7408187 | 2006-01-11 19:40:56 -0200 | [diff] [blame] | 88 | t = kzalloc(sizeof(*t), GFP_KERNEL); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 89 | if(t==NULL) |
| 90 | { |
| 91 | kfree(client); |
| 92 | return -ENOMEM; |
| 93 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 94 | strlcpy(client->name, IF_NAME, I2C_NAME_SIZE); |
Ingo Molnar | 3593cab | 2006-02-07 06:49:14 -0200 | [diff] [blame] | 95 | mutex_init(&t->lock); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 96 | |
| 97 | /* |
| 98 | * Now create a video4linux device |
| 99 | */ |
| 100 | |
| 101 | vd = video_device_alloc(); |
| 102 | if(vd==NULL) |
| 103 | { |
| 104 | kfree(t); |
| 105 | kfree(client); |
| 106 | return -ENOMEM; |
| 107 | } |
| 108 | i2c_set_clientdata(client, vd); |
| 109 | memcpy(vd, &saa_template, sizeof(*vd)); |
| 110 | |
| 111 | for (pgbuf = 0; pgbuf < NUM_DAUS; pgbuf++) |
| 112 | { |
| 113 | memset(t->pgbuf[pgbuf], ' ', sizeof(t->pgbuf[0])); |
| 114 | t->is_searching[pgbuf] = FALSE; |
| 115 | } |
| 116 | vd->priv=t; |
| 117 | |
| 118 | |
| 119 | /* |
| 120 | * Register it |
| 121 | */ |
| 122 | |
| 123 | if((err=video_register_device(vd, VFL_TYPE_VTX,-1))<0) |
| 124 | { |
| 125 | kfree(t); |
| 126 | kfree(client); |
| 127 | video_device_release(vd); |
| 128 | return err; |
| 129 | } |
| 130 | t->client = client; |
| 131 | i2c_attach_client(client); |
| 132 | return 0; |
| 133 | } |
| 134 | |
| 135 | /* |
| 136 | * We do most of the hard work when we become a device on the i2c. |
| 137 | */ |
| 138 | static int saa5246a_probe(struct i2c_adapter *adap) |
| 139 | { |
| 140 | if (adap->class & I2C_CLASS_TV_ANALOG) |
| 141 | return i2c_probe(adap, &addr_data, saa5246a_attach); |
| 142 | return 0; |
| 143 | } |
| 144 | |
| 145 | static int saa5246a_detach(struct i2c_client *client) |
| 146 | { |
| 147 | struct video_device *vd = i2c_get_clientdata(client); |
| 148 | i2c_detach_client(client); |
| 149 | video_unregister_device(vd); |
| 150 | kfree(vd->priv); |
| 151 | kfree(client); |
| 152 | return 0; |
| 153 | } |
| 154 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 155 | /* |
| 156 | * I2C interfaces |
| 157 | */ |
| 158 | |
| 159 | static struct i2c_driver i2c_driver_videotext = |
| 160 | { |
Laurent Riffard | 604f28e | 2005-11-26 20:43:39 +0100 | [diff] [blame] | 161 | .driver = { |
Laurent Riffard | 604f28e | 2005-11-26 20:43:39 +0100 | [diff] [blame] | 162 | .name = IF_NAME, /* name */ |
| 163 | }, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 164 | .id = I2C_DRIVERID_SAA5249, /* in i2c.h */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 165 | .attach_adapter = saa5246a_probe, |
| 166 | .detach_client = saa5246a_detach, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 167 | }; |
| 168 | |
| 169 | static struct i2c_client client_template = { |
| 170 | .driver = &i2c_driver_videotext, |
| 171 | .name = "(unset)", |
| 172 | }; |
| 173 | |
| 174 | static int i2c_sendbuf(struct saa5246a_device *t, int reg, int count, u8 *data) |
| 175 | { |
| 176 | char buf[64]; |
| 177 | |
| 178 | buf[0] = reg; |
| 179 | memcpy(buf+1, data, count); |
| 180 | |
| 181 | if(i2c_master_send(t->client, buf, count+1)==count+1) |
| 182 | return 0; |
| 183 | return -1; |
| 184 | } |
| 185 | |
| 186 | static int i2c_senddata(struct saa5246a_device *t, ...) |
| 187 | { |
| 188 | unsigned char buf[64]; |
| 189 | int v; |
| 190 | int ct=0; |
| 191 | va_list argp; |
| 192 | va_start(argp,t); |
| 193 | |
| 194 | while((v=va_arg(argp,int))!=-1) |
| 195 | buf[ct++]=v; |
| 196 | return i2c_sendbuf(t, buf[0], ct-1, buf+1); |
| 197 | } |
| 198 | |
| 199 | /* Get count number of bytes from I²C-device at address adr, store them in buf. |
| 200 | * Start & stop handshaking is done by this routine, ack will be sent after the |
| 201 | * last byte to inhibit further sending of data. If uaccess is TRUE, data is |
| 202 | * written to user-space with put_user. Returns -1 if I²C-device didn't send |
| 203 | * acknowledge, 0 otherwise |
| 204 | */ |
| 205 | static int i2c_getdata(struct saa5246a_device *t, int count, u8 *buf) |
| 206 | { |
| 207 | if(i2c_master_recv(t->client, buf, count)!=count) |
| 208 | return -1; |
| 209 | return 0; |
| 210 | } |
| 211 | |
| 212 | /* When a page is found then the not FOUND bit in one of the status registers |
| 213 | * of the SAA5264A chip is cleared. Unfortunately this bit is not set |
| 214 | * automatically when a new page is requested. Instead this function must be |
| 215 | * called after a page has been requested. |
| 216 | * |
| 217 | * Return value: 0 if successful |
| 218 | */ |
| 219 | static int saa5246a_clear_found_bit(struct saa5246a_device *t, |
| 220 | unsigned char dau_no) |
| 221 | { |
| 222 | unsigned char row_25_column_8; |
| 223 | |
| 224 | if (i2c_senddata(t, SAA5246A_REGISTER_R8, |
| 225 | |
| 226 | dau_no | |
| 227 | R8_DO_NOT_CLEAR_MEMORY, |
| 228 | |
| 229 | R9_CURSER_ROW_25, |
| 230 | |
| 231 | R10_CURSER_COLUMN_8, |
| 232 | |
| 233 | COMMAND_END) || |
| 234 | i2c_getdata(t, 1, &row_25_column_8)) |
| 235 | { |
| 236 | return -EIO; |
| 237 | } |
| 238 | row_25_column_8 |= ROW25_COLUMN8_PAGE_NOT_FOUND; |
| 239 | if (i2c_senddata(t, SAA5246A_REGISTER_R8, |
| 240 | |
| 241 | dau_no | |
| 242 | R8_DO_NOT_CLEAR_MEMORY, |
| 243 | |
| 244 | R9_CURSER_ROW_25, |
| 245 | |
| 246 | R10_CURSER_COLUMN_8, |
| 247 | |
| 248 | row_25_column_8, |
| 249 | |
| 250 | COMMAND_END)) |
| 251 | { |
| 252 | return -EIO; |
| 253 | } |
| 254 | |
| 255 | return 0; |
| 256 | } |
| 257 | |
| 258 | /* Requests one videotext page as described in req. The fields of req are |
| 259 | * checked and an error is returned if something is invalid. |
| 260 | * |
| 261 | * Return value: 0 if successful |
| 262 | */ |
| 263 | static int saa5246a_request_page(struct saa5246a_device *t, |
| 264 | vtx_pagereq_t *req) |
| 265 | { |
| 266 | if (req->pagemask < 0 || req->pagemask >= PGMASK_MAX) |
| 267 | return -EINVAL; |
| 268 | if (req->pagemask & PGMASK_PAGE) |
| 269 | if (req->page < 0 || req->page > PAGE_MAX) |
| 270 | return -EINVAL; |
| 271 | if (req->pagemask & PGMASK_HOUR) |
| 272 | if (req->hour < 0 || req->hour > HOUR_MAX) |
| 273 | return -EINVAL; |
| 274 | if (req->pagemask & PGMASK_MINUTE) |
| 275 | if (req->minute < 0 || req->minute > MINUTE_MAX) |
| 276 | return -EINVAL; |
| 277 | if (req->pgbuf < 0 || req->pgbuf >= NUM_DAUS) |
| 278 | return -EINVAL; |
| 279 | |
| 280 | if (i2c_senddata(t, SAA5246A_REGISTER_R2, |
| 281 | |
| 282 | R2_IN_R3_SELECT_PAGE_HUNDREDS | |
| 283 | req->pgbuf << 4 | |
| 284 | R2_BANK_0 | |
| 285 | R2_HAMMING_CHECK_OFF, |
| 286 | |
| 287 | HUNDREDS_OF_PAGE(req->page) | |
| 288 | R3_HOLD_PAGE | |
| 289 | (req->pagemask & PG_HUND ? |
| 290 | R3_PAGE_HUNDREDS_DO_CARE : |
| 291 | R3_PAGE_HUNDREDS_DO_NOT_CARE), |
| 292 | |
| 293 | TENS_OF_PAGE(req->page) | |
| 294 | (req->pagemask & PG_TEN ? |
| 295 | R3_PAGE_TENS_DO_CARE : |
| 296 | R3_PAGE_TENS_DO_NOT_CARE), |
| 297 | |
| 298 | UNITS_OF_PAGE(req->page) | |
| 299 | (req->pagemask & PG_UNIT ? |
| 300 | R3_PAGE_UNITS_DO_CARE : |
| 301 | R3_PAGE_UNITS_DO_NOT_CARE), |
| 302 | |
| 303 | TENS_OF_HOUR(req->hour) | |
| 304 | (req->pagemask & HR_TEN ? |
| 305 | R3_HOURS_TENS_DO_CARE : |
| 306 | R3_HOURS_TENS_DO_NOT_CARE), |
| 307 | |
| 308 | UNITS_OF_HOUR(req->hour) | |
| 309 | (req->pagemask & HR_UNIT ? |
| 310 | R3_HOURS_UNITS_DO_CARE : |
| 311 | R3_HOURS_UNITS_DO_NOT_CARE), |
| 312 | |
| 313 | TENS_OF_MINUTE(req->minute) | |
| 314 | (req->pagemask & MIN_TEN ? |
| 315 | R3_MINUTES_TENS_DO_CARE : |
| 316 | R3_MINUTES_TENS_DO_NOT_CARE), |
| 317 | |
| 318 | UNITS_OF_MINUTE(req->minute) | |
| 319 | (req->pagemask & MIN_UNIT ? |
| 320 | R3_MINUTES_UNITS_DO_CARE : |
| 321 | R3_MINUTES_UNITS_DO_NOT_CARE), |
| 322 | |
| 323 | COMMAND_END) || i2c_senddata(t, SAA5246A_REGISTER_R2, |
| 324 | |
| 325 | R2_IN_R3_SELECT_PAGE_HUNDREDS | |
| 326 | req->pgbuf << 4 | |
| 327 | R2_BANK_0 | |
| 328 | R2_HAMMING_CHECK_OFF, |
| 329 | |
| 330 | HUNDREDS_OF_PAGE(req->page) | |
| 331 | R3_UPDATE_PAGE | |
| 332 | (req->pagemask & PG_HUND ? |
| 333 | R3_PAGE_HUNDREDS_DO_CARE : |
| 334 | R3_PAGE_HUNDREDS_DO_NOT_CARE), |
| 335 | |
| 336 | COMMAND_END)) |
| 337 | { |
| 338 | return -EIO; |
| 339 | } |
| 340 | |
| 341 | t->is_searching[req->pgbuf] = TRUE; |
| 342 | return 0; |
| 343 | } |
| 344 | |
| 345 | /* This routine decodes the page number from the infobits contained in line 25. |
| 346 | * |
| 347 | * Parameters: |
| 348 | * infobits: must be bits 0 to 9 of column 25 |
| 349 | * |
| 350 | * Return value: page number coded in hexadecimal, i. e. page 123 is coded 0x123 |
| 351 | */ |
| 352 | static inline int saa5246a_extract_pagenum_from_infobits( |
| 353 | unsigned char infobits[10]) |
| 354 | { |
| 355 | int page_hundreds, page_tens, page_units; |
| 356 | |
| 357 | page_units = infobits[0] & ROW25_COLUMN0_PAGE_UNITS; |
| 358 | page_tens = infobits[1] & ROW25_COLUMN1_PAGE_TENS; |
| 359 | page_hundreds = infobits[8] & ROW25_COLUMN8_PAGE_HUNDREDS; |
| 360 | |
| 361 | /* page 0x.. means page 8.. */ |
| 362 | if (page_hundreds == 0) |
| 363 | page_hundreds = 8; |
| 364 | |
| 365 | return((page_hundreds << 8) | (page_tens << 4) | page_units); |
| 366 | } |
| 367 | |
| 368 | /* Decodes the hour from the infobits contained in line 25. |
| 369 | * |
| 370 | * Parameters: |
| 371 | * infobits: must be bits 0 to 9 of column 25 |
| 372 | * |
| 373 | * Return: hour coded in hexadecimal, i. e. 12h is coded 0x12 |
| 374 | */ |
| 375 | static inline int saa5246a_extract_hour_from_infobits( |
| 376 | unsigned char infobits[10]) |
| 377 | { |
| 378 | int hour_tens, hour_units; |
| 379 | |
| 380 | hour_units = infobits[4] & ROW25_COLUMN4_HOUR_UNITS; |
| 381 | hour_tens = infobits[5] & ROW25_COLUMN5_HOUR_TENS; |
| 382 | |
| 383 | return((hour_tens << 4) | hour_units); |
| 384 | } |
| 385 | |
| 386 | /* Decodes the minutes from the infobits contained in line 25. |
| 387 | * |
| 388 | * Parameters: |
| 389 | * infobits: must be bits 0 to 9 of column 25 |
| 390 | * |
| 391 | * Return: minutes coded in hexadecimal, i. e. 10min is coded 0x10 |
| 392 | */ |
| 393 | static inline int saa5246a_extract_minutes_from_infobits( |
| 394 | unsigned char infobits[10]) |
| 395 | { |
| 396 | int minutes_tens, minutes_units; |
| 397 | |
| 398 | minutes_units = infobits[2] & ROW25_COLUMN2_MINUTES_UNITS; |
| 399 | minutes_tens = infobits[3] & ROW25_COLUMN3_MINUTES_TENS; |
| 400 | |
| 401 | return((minutes_tens << 4) | minutes_units); |
| 402 | } |
| 403 | |
| 404 | /* Reads the status bits contained in the first 10 columns of the first line |
| 405 | * and extracts the information into info. |
| 406 | * |
| 407 | * Return value: 0 if successful |
| 408 | */ |
| 409 | static inline int saa5246a_get_status(struct saa5246a_device *t, |
| 410 | vtx_pageinfo_t *info, unsigned char dau_no) |
| 411 | { |
| 412 | unsigned char infobits[10]; |
| 413 | int column; |
| 414 | |
| 415 | if (dau_no >= NUM_DAUS) |
| 416 | return -EINVAL; |
| 417 | |
| 418 | if (i2c_senddata(t, SAA5246A_REGISTER_R8, |
| 419 | |
| 420 | dau_no | |
| 421 | R8_DO_NOT_CLEAR_MEMORY, |
| 422 | |
| 423 | R9_CURSER_ROW_25, |
| 424 | |
| 425 | R10_CURSER_COLUMN_0, |
| 426 | |
| 427 | COMMAND_END) || |
| 428 | i2c_getdata(t, 10, infobits)) |
| 429 | { |
| 430 | return -EIO; |
| 431 | } |
| 432 | |
| 433 | info->pagenum = saa5246a_extract_pagenum_from_infobits(infobits); |
| 434 | info->hour = saa5246a_extract_hour_from_infobits(infobits); |
| 435 | info->minute = saa5246a_extract_minutes_from_infobits(infobits); |
| 436 | info->charset = ((infobits[7] & ROW25_COLUMN7_CHARACTER_SET) >> 1); |
| 437 | info->delete = !!(infobits[3] & ROW25_COLUMN3_DELETE_PAGE); |
| 438 | info->headline = !!(infobits[5] & ROW25_COLUMN5_INSERT_HEADLINE); |
| 439 | info->subtitle = !!(infobits[5] & ROW25_COLUMN5_INSERT_SUBTITLE); |
| 440 | info->supp_header = !!(infobits[6] & ROW25_COLUMN6_SUPPRESS_HEADER); |
| 441 | info->update = !!(infobits[6] & ROW25_COLUMN6_UPDATE_PAGE); |
| 442 | info->inter_seq = !!(infobits[6] & ROW25_COLUMN6_INTERRUPTED_SEQUENCE); |
| 443 | info->dis_disp = !!(infobits[6] & ROW25_COLUMN6_SUPPRESS_DISPLAY); |
| 444 | info->serial = !!(infobits[7] & ROW25_COLUMN7_SERIAL_MODE); |
| 445 | info->notfound = !!(infobits[8] & ROW25_COLUMN8_PAGE_NOT_FOUND); |
| 446 | info->pblf = !!(infobits[9] & ROW25_COLUMN9_PAGE_BEING_LOOKED_FOR); |
| 447 | info->hamming = 0; |
| 448 | for (column = 0; column <= 7; column++) { |
| 449 | if (infobits[column] & ROW25_COLUMN0_TO_7_HAMMING_ERROR) { |
| 450 | info->hamming = 1; |
| 451 | break; |
| 452 | } |
| 453 | } |
| 454 | if (!info->hamming && !info->notfound) |
| 455 | t->is_searching[dau_no] = FALSE; |
| 456 | return 0; |
| 457 | } |
| 458 | |
| 459 | /* Reads 1 videotext page buffer of the SAA5246A. |
| 460 | * |
| 461 | * req is used both as input and as output. It contains information which part |
| 462 | * must be read. The videotext page is copied into req->buffer. |
| 463 | * |
| 464 | * Return value: 0 if successful |
| 465 | */ |
| 466 | static inline int saa5246a_get_page(struct saa5246a_device *t, |
| 467 | vtx_pagereq_t *req) |
| 468 | { |
| 469 | int start, end, size; |
| 470 | char *buf; |
| 471 | int err; |
| 472 | |
| 473 | if (req->pgbuf < 0 || req->pgbuf >= NUM_DAUS || |
| 474 | req->start < 0 || req->start > req->end || req->end >= VTX_PAGESIZE) |
| 475 | return -EINVAL; |
| 476 | |
| 477 | buf = kmalloc(VTX_PAGESIZE, GFP_KERNEL); |
| 478 | if (!buf) |
| 479 | return -ENOMEM; |
| 480 | |
| 481 | /* Read "normal" part of page */ |
| 482 | err = -EIO; |
| 483 | |
| 484 | end = min(req->end, VTX_PAGESIZE - 1); |
| 485 | if (i2c_senddata(t, SAA5246A_REGISTER_R8, |
| 486 | req->pgbuf | R8_DO_NOT_CLEAR_MEMORY, |
| 487 | ROW(req->start), COLUMN(req->start), COMMAND_END)) |
| 488 | goto out; |
| 489 | if (i2c_getdata(t, end - req->start + 1, buf)) |
| 490 | goto out; |
| 491 | err = -EFAULT; |
| 492 | if (copy_to_user(req->buffer, buf, end - req->start + 1)) |
| 493 | goto out; |
| 494 | |
| 495 | /* Always get the time from buffer 4, since this stupid SAA5246A only |
| 496 | * updates the currently displayed buffer... |
| 497 | */ |
| 498 | if (REQ_CONTAINS_TIME(req)) { |
| 499 | start = max(req->start, POS_TIME_START); |
| 500 | end = min(req->end, POS_TIME_END); |
| 501 | size = end - start + 1; |
| 502 | err = -EINVAL; |
| 503 | if (size < 0) |
| 504 | goto out; |
| 505 | err = -EIO; |
| 506 | if (i2c_senddata(t, SAA5246A_REGISTER_R8, |
| 507 | R8_ACTIVE_CHAPTER_4 | R8_DO_NOT_CLEAR_MEMORY, |
| 508 | R9_CURSER_ROW_0, start, COMMAND_END)) |
| 509 | goto out; |
| 510 | if (i2c_getdata(t, size, buf)) |
| 511 | goto out; |
| 512 | err = -EFAULT; |
| 513 | if (copy_to_user(req->buffer + start - req->start, buf, size)) |
| 514 | goto out; |
| 515 | } |
| 516 | /* Insert the header from buffer 4 only, if acquisition circuit is still searching for a page */ |
| 517 | if (REQ_CONTAINS_HEADER(req) && t->is_searching[req->pgbuf]) { |
| 518 | start = max(req->start, POS_HEADER_START); |
| 519 | end = min(req->end, POS_HEADER_END); |
| 520 | size = end - start + 1; |
| 521 | err = -EINVAL; |
| 522 | if (size < 0) |
| 523 | goto out; |
| 524 | err = -EIO; |
| 525 | if (i2c_senddata(t, SAA5246A_REGISTER_R8, |
| 526 | R8_ACTIVE_CHAPTER_4 | R8_DO_NOT_CLEAR_MEMORY, |
| 527 | R9_CURSER_ROW_0, start, COMMAND_END)) |
| 528 | goto out; |
| 529 | if (i2c_getdata(t, end - start + 1, buf)) |
| 530 | goto out; |
| 531 | err = -EFAULT; |
| 532 | if (copy_to_user(req->buffer + start - req->start, buf, size)) |
| 533 | goto out; |
| 534 | } |
| 535 | err = 0; |
| 536 | out: |
| 537 | kfree(buf); |
| 538 | return err; |
| 539 | } |
| 540 | |
| 541 | /* Stops the acquisition circuit given in dau_no. The page buffer associated |
| 542 | * with this acquisition circuit will no more be updated. The other daus are |
| 543 | * not affected. |
| 544 | * |
| 545 | * Return value: 0 if successful |
| 546 | */ |
| 547 | static inline int saa5246a_stop_dau(struct saa5246a_device *t, |
| 548 | unsigned char dau_no) |
| 549 | { |
| 550 | if (dau_no >= NUM_DAUS) |
| 551 | return -EINVAL; |
| 552 | if (i2c_senddata(t, SAA5246A_REGISTER_R2, |
| 553 | |
| 554 | R2_IN_R3_SELECT_PAGE_HUNDREDS | |
| 555 | dau_no << 4 | |
| 556 | R2_BANK_0 | |
| 557 | R2_HAMMING_CHECK_OFF, |
| 558 | |
| 559 | R3_PAGE_HUNDREDS_0 | |
| 560 | R3_HOLD_PAGE | |
| 561 | R3_PAGE_HUNDREDS_DO_NOT_CARE, |
| 562 | |
| 563 | COMMAND_END)) |
| 564 | { |
| 565 | return -EIO; |
| 566 | } |
| 567 | t->is_searching[dau_no] = FALSE; |
| 568 | return 0; |
| 569 | } |
| 570 | |
| 571 | /* Handles ioctls defined in videotext.h |
| 572 | * |
| 573 | * Returns 0 if successful |
| 574 | */ |
| 575 | static int do_saa5246a_ioctl(struct inode *inode, struct file *file, |
| 576 | unsigned int cmd, void *arg) |
| 577 | { |
| 578 | struct video_device *vd = video_devdata(file); |
| 579 | struct saa5246a_device *t=vd->priv; |
| 580 | switch(cmd) |
| 581 | { |
| 582 | case VTXIOCGETINFO: |
| 583 | { |
| 584 | vtx_info_t *info = arg; |
| 585 | |
| 586 | info->version_major = MAJOR_VERSION; |
| 587 | info->version_minor = MINOR_VERSION; |
| 588 | info->numpages = NUM_DAUS; |
| 589 | return 0; |
| 590 | } |
| 591 | |
| 592 | case VTXIOCCLRPAGE: |
| 593 | { |
| 594 | vtx_pagereq_t *req = arg; |
| 595 | |
| 596 | if (req->pgbuf < 0 || req->pgbuf >= NUM_DAUS) |
| 597 | return -EINVAL; |
| 598 | memset(t->pgbuf[req->pgbuf], ' ', sizeof(t->pgbuf[0])); |
| 599 | return 0; |
| 600 | } |
| 601 | |
| 602 | case VTXIOCCLRFOUND: |
| 603 | { |
| 604 | vtx_pagereq_t *req = arg; |
| 605 | |
| 606 | if (req->pgbuf < 0 || req->pgbuf >= NUM_DAUS) |
| 607 | return -EINVAL; |
| 608 | return(saa5246a_clear_found_bit(t, req->pgbuf)); |
| 609 | } |
| 610 | |
| 611 | case VTXIOCPAGEREQ: |
| 612 | { |
| 613 | vtx_pagereq_t *req = arg; |
| 614 | |
| 615 | return(saa5246a_request_page(t, req)); |
| 616 | } |
| 617 | |
| 618 | case VTXIOCGETSTAT: |
| 619 | { |
| 620 | vtx_pagereq_t *req = arg; |
| 621 | vtx_pageinfo_t info; |
| 622 | int rval; |
| 623 | |
| 624 | if ((rval = saa5246a_get_status(t, &info, req->pgbuf))) |
| 625 | return rval; |
| 626 | if(copy_to_user(req->buffer, &info, |
| 627 | sizeof(vtx_pageinfo_t))) |
| 628 | return -EFAULT; |
| 629 | return 0; |
| 630 | } |
| 631 | |
| 632 | case VTXIOCGETPAGE: |
| 633 | { |
| 634 | vtx_pagereq_t *req = arg; |
| 635 | |
| 636 | return(saa5246a_get_page(t, req)); |
| 637 | } |
| 638 | |
| 639 | case VTXIOCSTOPDAU: |
| 640 | { |
| 641 | vtx_pagereq_t *req = arg; |
| 642 | |
| 643 | return(saa5246a_stop_dau(t, req->pgbuf)); |
| 644 | } |
| 645 | |
| 646 | case VTXIOCPUTPAGE: |
| 647 | case VTXIOCSETDISP: |
| 648 | case VTXIOCPUTSTAT: |
| 649 | return 0; |
| 650 | |
| 651 | case VTXIOCCLRCACHE: |
| 652 | { |
| 653 | return 0; |
| 654 | } |
| 655 | |
| 656 | case VTXIOCSETVIRT: |
| 657 | { |
| 658 | /* I do not know what "virtual mode" means */ |
| 659 | return 0; |
| 660 | } |
| 661 | } |
| 662 | return -EINVAL; |
| 663 | } |
| 664 | |
| 665 | /* |
| 666 | * Translates old vtx IOCTLs to new ones |
| 667 | * |
| 668 | * This keeps new kernel versions compatible with old userspace programs. |
| 669 | */ |
| 670 | static inline unsigned int vtx_fix_command(unsigned int cmd) |
| 671 | { |
| 672 | switch (cmd) { |
| 673 | case VTXIOCGETINFO_OLD: |
| 674 | cmd = VTXIOCGETINFO; |
| 675 | break; |
| 676 | case VTXIOCCLRPAGE_OLD: |
| 677 | cmd = VTXIOCCLRPAGE; |
| 678 | break; |
| 679 | case VTXIOCCLRFOUND_OLD: |
| 680 | cmd = VTXIOCCLRFOUND; |
| 681 | break; |
| 682 | case VTXIOCPAGEREQ_OLD: |
| 683 | cmd = VTXIOCPAGEREQ; |
| 684 | break; |
| 685 | case VTXIOCGETSTAT_OLD: |
| 686 | cmd = VTXIOCGETSTAT; |
| 687 | break; |
| 688 | case VTXIOCGETPAGE_OLD: |
| 689 | cmd = VTXIOCGETPAGE; |
| 690 | break; |
| 691 | case VTXIOCSTOPDAU_OLD: |
| 692 | cmd = VTXIOCSTOPDAU; |
| 693 | break; |
| 694 | case VTXIOCPUTPAGE_OLD: |
| 695 | cmd = VTXIOCPUTPAGE; |
| 696 | break; |
| 697 | case VTXIOCSETDISP_OLD: |
| 698 | cmd = VTXIOCSETDISP; |
| 699 | break; |
| 700 | case VTXIOCPUTSTAT_OLD: |
| 701 | cmd = VTXIOCPUTSTAT; |
| 702 | break; |
| 703 | case VTXIOCCLRCACHE_OLD: |
| 704 | cmd = VTXIOCCLRCACHE; |
| 705 | break; |
| 706 | case VTXIOCSETVIRT_OLD: |
| 707 | cmd = VTXIOCSETVIRT; |
| 708 | break; |
| 709 | } |
| 710 | return cmd; |
| 711 | } |
| 712 | |
| 713 | /* |
| 714 | * Handle the locking |
| 715 | */ |
| 716 | static int saa5246a_ioctl(struct inode *inode, struct file *file, |
| 717 | unsigned int cmd, unsigned long arg) |
| 718 | { |
| 719 | struct video_device *vd = video_devdata(file); |
| 720 | struct saa5246a_device *t = vd->priv; |
| 721 | int err; |
| 722 | |
| 723 | cmd = vtx_fix_command(cmd); |
Ingo Molnar | 3593cab | 2006-02-07 06:49:14 -0200 | [diff] [blame] | 724 | mutex_lock(&t->lock); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 725 | err = video_usercopy(inode, file, cmd, arg, do_saa5246a_ioctl); |
Ingo Molnar | 3593cab | 2006-02-07 06:49:14 -0200 | [diff] [blame] | 726 | mutex_unlock(&t->lock); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 727 | return err; |
| 728 | } |
| 729 | |
| 730 | static int saa5246a_open(struct inode *inode, struct file *file) |
| 731 | { |
| 732 | struct video_device *vd = video_devdata(file); |
| 733 | struct saa5246a_device *t = vd->priv; |
| 734 | int err; |
| 735 | |
| 736 | err = video_exclusive_open(inode,file); |
| 737 | if (err < 0) |
| 738 | return err; |
| 739 | |
| 740 | if (t->client==NULL) { |
| 741 | err = -ENODEV; |
| 742 | goto fail; |
| 743 | } |
| 744 | |
| 745 | if (i2c_senddata(t, SAA5246A_REGISTER_R0, |
| 746 | |
| 747 | R0_SELECT_R11 | |
| 748 | R0_PLL_TIME_CONSTANT_LONG | |
| 749 | R0_ENABLE_nODD_EVEN_OUTPUT | |
| 750 | R0_ENABLE_HDR_POLL | |
| 751 | R0_DO_NOT_FORCE_nODD_EVEN_LOW_IF_PICTURE_DISPLAYED | |
| 752 | R0_NO_FREE_RUN_PLL | |
| 753 | R0_NO_AUTOMATIC_FASTEXT_PROMPT, |
| 754 | |
| 755 | R1_NON_INTERLACED_312_312_LINES | |
| 756 | R1_DEW | |
| 757 | R1_EXTENDED_PACKET_DISABLE | |
| 758 | R1_DAUS_ALL_ON | |
| 759 | R1_8_BITS_NO_PARITY | |
| 760 | R1_VCS_TO_SCS, |
| 761 | |
| 762 | COMMAND_END) || |
| 763 | i2c_senddata(t, SAA5246A_REGISTER_R4, |
| 764 | |
| 765 | /* We do not care much for the TV display but nevertheless we |
| 766 | * need the currently displayed page later because only on that |
| 767 | * page the time is updated. */ |
| 768 | R4_DISPLAY_PAGE_4, |
| 769 | |
| 770 | COMMAND_END)) |
| 771 | { |
| 772 | err = -EIO; |
| 773 | goto fail; |
| 774 | } |
| 775 | |
| 776 | return 0; |
| 777 | |
| 778 | fail: |
| 779 | video_exclusive_release(inode,file); |
| 780 | return err; |
| 781 | } |
| 782 | |
| 783 | static int saa5246a_release(struct inode *inode, struct file *file) |
| 784 | { |
| 785 | struct video_device *vd = video_devdata(file); |
| 786 | struct saa5246a_device *t = vd->priv; |
| 787 | |
| 788 | /* Stop all acquisition circuits. */ |
| 789 | i2c_senddata(t, SAA5246A_REGISTER_R1, |
| 790 | |
| 791 | R1_INTERLACED_312_AND_HALF_312_AND_HALF_LINES | |
| 792 | R1_DEW | |
| 793 | R1_EXTENDED_PACKET_DISABLE | |
| 794 | R1_DAUS_ALL_OFF | |
| 795 | R1_8_BITS_NO_PARITY | |
| 796 | R1_VCS_TO_SCS, |
| 797 | |
| 798 | COMMAND_END); |
| 799 | video_exclusive_release(inode,file); |
| 800 | return 0; |
| 801 | } |
| 802 | |
| 803 | static int __init init_saa_5246a (void) |
| 804 | { |
| 805 | printk(KERN_INFO |
| 806 | "SAA5246A (or compatible) Teletext decoder driver version %d.%d\n", |
| 807 | MAJOR_VERSION, MINOR_VERSION); |
| 808 | return i2c_add_driver(&i2c_driver_videotext); |
| 809 | } |
| 810 | |
| 811 | static void __exit cleanup_saa_5246a (void) |
| 812 | { |
| 813 | i2c_del_driver(&i2c_driver_videotext); |
| 814 | } |
| 815 | |
| 816 | module_init(init_saa_5246a); |
| 817 | module_exit(cleanup_saa_5246a); |
| 818 | |
Arjan van de Ven | fa027c2 | 2007-02-12 00:55:33 -0800 | [diff] [blame] | 819 | static const struct file_operations saa_fops = { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 820 | .owner = THIS_MODULE, |
| 821 | .open = saa5246a_open, |
| 822 | .release = saa5246a_release, |
| 823 | .ioctl = saa5246a_ioctl, |
| 824 | .llseek = no_llseek, |
| 825 | }; |
| 826 | |
| 827 | static struct video_device saa_template = |
| 828 | { |
| 829 | .owner = THIS_MODULE, |
| 830 | .name = IF_NAME, |
| 831 | .type = VID_TYPE_TELETEXT, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 832 | .fops = &saa_fops, |
| 833 | .release = video_device_release, |
| 834 | .minor = -1, |
| 835 | }; |