drivers/mfd/ab8500-debugfs.c

   1 /*
   2  * Copyright (C) ST-Ericsson SA 2010
   3  *
   4  * Author: Mattias Wallin <mattias.wallin@stericsson.com> for ST-Ericsson.
   5  * License Terms: GNU General Public License v2
   6  */
   7
   8 #include <linux/seq_file.h>
   9 #include <linux/uaccess.h>
  10 #include <linux/fs.h>
  11 #include <linux/debugfs.h>
  12 #include <linux/platform_device.h>
  13
  14 #include <linux/mfd/abx500.h>
  15 #include <linux/mfd/ab8500.h>
  16
  17 static u32 debug_bank;
  18 static u32 debug_address;
  19
  20 /**
  21  * struct ab8500_reg_range
  22  * @first: the first address of the range
  23  * @last: the last address of the range
  24  * @perm: access permissions for the range
  25  */
  26 struct ab8500_reg_range {
  27         u8 first;
  28         u8 last;
  29         u8 perm;
  30 };
  31
  32 /**
  33  * struct ab8500_i2c_ranges
  34  * @num_ranges: the number of ranges in the list
  35  * @bankid: bank identifier
  36  * @range: the list of register ranges
  37  */
  38 struct ab8500_i2c_ranges {
  39         u8 num_ranges;
  40         u8 bankid;
  41         const struct ab8500_reg_range *range;
  42 };
  43
  44 #define AB8500_NAME_STRING "ab8500"
  45 #define AB8500_NUM_BANKS 22
  46
  47 #define AB8500_REV_REG 0x80
  48
  49 static struct ab8500_i2c_ranges debug_ranges[AB8500_NUM_BANKS] = {
  50         [0x0] = {
  51                 .num_ranges = 0,
  52                 .range = 0,
  53         },
  54         [AB8500_SYS_CTRL1_BLOCK] = {
  55                 .num_ranges = 3,
  56                 .range = (struct ab8500_reg_range[]) {
  57                         {
  58                                 .first = 0x00,
  59                                 .last = 0x02,
  60                         },
  61                         {
  62                                 .first = 0x42,
  63                                 .last = 0x42,
  64                         },
  65                         {
  66                                 .first = 0x80,
  67                                 .last = 0x81,
  68                         },
  69                 },
  70         },
  71         [AB8500_SYS_CTRL2_BLOCK] = {
  72                 .num_ranges = 4,
  73                 .range = (struct ab8500_reg_range[]) {
  74                         {
  75                                 .first = 0x00,
  76                                 .last = 0x0D,
  77                         },
  78                         {
  79                                 .first = 0x0F,
  80                                 .last = 0x17,
  81                         },
  82                         {
  83                                 .first = 0x30,
  84                                 .last = 0x30,
  85                         },
  86                         {
  87                                 .first = 0x32,
  88                                 .last = 0x33,
  89                         },
  90                 },
  91         },
  92         [AB8500_REGU_CTRL1] = {
  93                 .num_ranges = 3,
  94                 .range = (struct ab8500_reg_range[]) {
  95                         {
  96                                 .first = 0x00,
  97                                 .last = 0x00,
  98                         },
  99                         {
 100                                 .first = 0x03,
 101                                 .last = 0x10,
 102                         },
 103                         {
 104                                 .first = 0x80,
 105                                 .last = 0x84,
 106                         },
 107                 },
 108         },
 109         [AB8500_REGU_CTRL2] = {
 110                 .num_ranges = 5,
 111                 .range = (struct ab8500_reg_range[]) {
 112                         {
 113                                 .first = 0x00,
 114                                 .last = 0x15,
 115                         },
 116                         {
 117                                 .first = 0x17,
 118                                 .last = 0x19,
 119                         },
 120                         {
 121                                 .first = 0x1B,
 122                                 .last = 0x1D,
 123                         },
 124                         {
 125                                 .first = 0x1F,
 126                                 .last = 0x22,
 127                         },
 128                         {
 129                                 .first = 0x40,
 130                                 .last = 0x44,
 131                         },
 132                         /* 0x80-0x8B is SIM registers and should
 133                          * not be accessed from here */
 134                 },
 135         },
 136         [AB8500_USB] = {
 137                 .num_ranges = 2,
 138                 .range = (struct ab8500_reg_range[]) {
 139                         {
 140                                 .first = 0x80,
 141                                 .last = 0x83,
 142                         },
 143                         {
 144                                 .first = 0x87,
 145                                 .last = 0x8A,
 146                         },
 147                 },
 148         },
 149         [AB8500_TVOUT] = {
 150                 .num_ranges = 9,
 151                 .range = (struct ab8500_reg_range[]) {
 152                         {
 153                                 .first = 0x00,
 154                                 .last = 0x12,
 155                         },
 156                         {
 157                                 .first = 0x15,
 158                                 .last = 0x17,
 159                         },
 160                         {
 161                                 .first = 0x19,
 162                                 .last = 0x21,
 163                         },
 164                         {
 165                                 .first = 0x27,
 166                                 .last = 0x2C,
 167                         },
 168                         {
 169                                 .first = 0x41,
 170                                 .last = 0x41,
 171                         },
 172                         {
 173                                 .first = 0x45,
 174                                 .last = 0x5B,
 175                         },
 176                         {
 177                                 .first = 0x5D,
 178                                 .last = 0x5D,
 179                         },
 180                         {
 181                                 .first = 0x69,
 182                                 .last = 0x69,
 183                         },
 184                         {
 185                                 .first = 0x80,
 186                                 .last = 0x81,
 187                         },
 188                 },
 189         },
 190         [AB8500_DBI] = {
 191                 .num_ranges = 0,
 192                 .range = NULL,
 193         },
 194         [AB8500_ECI_AV_ACC] = {
 195                 .num_ranges = 1,
 196                 .range = (struct ab8500_reg_range[]) {
 197                         {
 198                                 .first = 0x80,
 199                                 .last = 0x82,
 200                         },
 201                 },
 202         },
 203         [0x9] = {
 204                 .num_ranges = 0,
 205                 .range = NULL,
 206         },
 207         [AB8500_GPADC] = {
 208                 .num_ranges = 1,
 209                 .range = (struct ab8500_reg_range[]) {
 210                         {
 211                                 .first = 0x00,
 212                                 .last = 0x08,
 213                         },
 214                 },
 215         },
 216         [AB8500_CHARGER] = {
 217                 .num_ranges = 8,
 218                 .range = (struct ab8500_reg_range[]) {
 219                         {
 220                                 .first = 0x00,
 221                                 .last = 0x03,
 222                         },
 223                         {
 224                                 .first = 0x05,
 225                                 .last = 0x05,
 226                         },
 227                         {
 228                                 .first = 0x40,
 229                                 .last = 0x40,
 230                         },
 231                         {
 232                                 .first = 0x42,
 233                                 .last = 0x42,
 234                         },
 235                         {
 236                                 .first = 0x44,
 237                                 .last = 0x44,
 238                         },
 239                         {
 240                                 .first = 0x50,
 241                                 .last = 0x55,
 242                         },
 243                         {
 244                                 .first = 0x80,
 245                                 .last = 0x82,
 246                         },
 247                         {
 248                                 .first = 0xC0,
 249                                 .last = 0xC2,
 250                         },
 251                 },
 252         },
 253         [AB8500_GAS_GAUGE] = {
 254                 .num_ranges = 3,
 255                 .range = (struct ab8500_reg_range[]) {
 256                         {
 257                                 .first = 0x00,
 258                                 .last = 0x00,
 259                         },
 260                         {
 261                                 .first = 0x07,
 262                                 .last = 0x0A,
 263                         },
 264                         {
 265                                 .first = 0x10,
 266                                 .last = 0x14,
 267                         },
 268                 },
 269         },
 270         [AB8500_AUDIO] = {
 271                 .num_ranges = 1,
 272                 .range = (struct ab8500_reg_range[]) {
 273                         {
 274                                 .first = 0x00,
 275                                 .last = 0x6F,
 276                         },
 277                 },
 278         },
 279         [AB8500_INTERRUPT] = {
 280                 .num_ranges = 0,
 281                 .range = NULL,
 282         },
 283         [AB8500_RTC] = {
 284                 .num_ranges = 1,
 285                 .range = (struct ab8500_reg_range[]) {
 286                         {
 287                                 .first = 0x00,
 288                                 .last = 0x0F,
 289                         },
 290                 },
 291         },
 292         [AB8500_MISC] = {
 293                 .num_ranges = 8,
 294                 .range = (struct ab8500_reg_range[]) {
 295                         {
 296                                 .first = 0x00,
 297                                 .last = 0x05,
 298                         },
 299                         {
 300                                 .first = 0x10,
 301                                 .last = 0x15,
 302                         },
 303                         {
 304                                 .first = 0x20,
 305                                 .last = 0x25,
 306                         },
 307                         {
 308                                 .first = 0x30,
 309                                 .last = 0x35,
 310                         },
 311                         {
 312                                 .first = 0x40,
 313                                 .last = 0x45,
 314                         },
 315                         {
 316                                 .first = 0x50,
 317                                 .last = 0x50,
 318                         },
 319                         {
 320                                 .first = 0x60,
 321                                 .last = 0x67,
 322                         },
 323                         {
 324                                 .first = 0x80,
 325                                 .last = 0x80,
 326                         },
 327                 },
 328         },
 329         [0x11] = {
 330                 .num_ranges = 0,
 331                 .range = NULL,
 332         },
 333         [0x12] = {
 334                 .num_ranges = 0,
 335                 .range = NULL,
 336         },
 337         [0x13] = {
 338                 .num_ranges = 0,
 339                 .range = NULL,
 340         },
 341         [0x14] = {
 342                 .num_ranges = 0,
 343                 .range = NULL,
 344         },
 345         [AB8500_OTP_EMUL] = {
 346                 .num_ranges = 1,
 347                 .range = (struct ab8500_reg_range[]) {
 348                         {
 349                                 .first = 0x01,
 350                                 .last = 0x0F,
 351                         },
 352                 },
 353         },
 354 };
 355
 356 static int ab8500_registers_print(struct seq_file *s, void *p)
 357 {
 358         struct device *dev = s->private;
 359         unsigned int i;
 360         u32 bank = debug_bank;
 361
 362         seq_printf(s, AB8500_NAME_STRING " register values:\n");
 363
 364         seq_printf(s, " bank %u:\n", bank);
 365         for (i = 0; i < debug_ranges[bank].num_ranges; i++) {
 366                 u32 reg;
 367
 368                 for (reg = debug_ranges[bank].range[i].first;
 369                         reg <= debug_ranges[bank].range[i].last;
 370                         reg++) {
 371                         u8 value;
 372                         int err;
 373
 374                         err = abx500_get_register_interruptible(dev,
 375                                 (u8)bank, (u8)reg, &value);
 376                         if (err < 0) {
 377                                 dev_err(dev, "ab->read fail %d\n", err);
 378                                 return err;
 379                         }
 380
 381                         err = seq_printf(s, "  [%u/0x%02X]: 0x%02X\n", bank,
 382                                 reg, value);
 383                         if (err < 0) {
 384                                 dev_err(dev, "seq_printf overflow\n");
 385                                 /* Error is not returned here since
 386                                  * the output is wanted in any case */
 387                                 return 0;
 388                         }
 389                 }
 390         }
 391         return 0;
 392 }
 393
 394 static int ab8500_registers_open(struct inode *inode, struct file *file)
 395 {
 396         return single_open(file, ab8500_registers_print, inode->i_private);
 397 }
 398
 399 static const struct file_operations ab8500_registers_fops = {
 400         .open = ab8500_registers_open,
 401         .read = seq_read,
 402         .llseek = seq_lseek,
 403         .release = single_release,
 404         .owner = THIS_MODULE,
 405 };
 406
 407 static int ab8500_bank_print(struct seq_file *s, void *p)
 408 {
 409         return seq_printf(s, "%d\n", debug_bank);
 410 }
 411
 412 static int ab8500_bank_open(struct inode *inode, struct file *file)
 413 {
 414         return single_open(file, ab8500_bank_print, inode->i_private);
 415 }
 416
 417 static ssize_t ab8500_bank_write(struct file *file,
 418         const char __user *user_buf,
 419         size_t count, loff_t *ppos)
 420 {
 421         struct device *dev = ((struct seq_file *)(file->private_data))->private;
 422         unsigned long user_bank;
 423         int err;
 424
 425         /* Get userspace string and assure termination */
 426         err = kstrtoul_from_user(user_buf, count, 0, &user_bank);
 427         if (err)
 428                 return err;
 429
 430         if (user_bank >= AB8500_NUM_BANKS) {
 431                 dev_err(dev, "debugfs error input > number of banks\n");
 432                 return -EINVAL;
 433         }
 434
 435         debug_bank = user_bank;
 436
 437         return count;
 438 }
 439
 440 static int ab8500_address_print(struct seq_file *s, void *p)
 441 {
 442         return seq_printf(s, "0x%02X\n", debug_address);
 443 }
 444
 445 static int ab8500_address_open(struct inode *inode, struct file *file)
 446 {
 447         return single_open(file, ab8500_address_print, inode->i_private);
 448 }
 449
 450 static ssize_t ab8500_address_write(struct file *file,
 451         const char __user *user_buf,
 452         size_t count, loff_t *ppos)
 453 {
 454         struct device *dev = ((struct seq_file *)(file->private_data))->private;
 455         unsigned long user_address;
 456         int err;
 457
 458         /* Get userspace string and assure termination */
 459         err = kstrtoul_from_user(user_buf, count, 0, &user_address);
 460         if (err)
 461                 return err;
 462
 463         if (user_address > 0xff) {
 464                 dev_err(dev, "debugfs error input > 0xff\n");
 465                 return -EINVAL;
 466         }
 467         debug_address = user_address;
 468         return count;
 469 }
 470
 471 static int ab8500_val_print(struct seq_file *s, void *p)
 472 {
 473         struct device *dev = s->private;
 474         int ret;
 475         u8 regvalue;
 476
 477         ret = abx500_get_register_interruptible(dev,
 478                 (u8)debug_bank, (u8)debug_address, &regvalue);
 479         if (ret < 0) {
 480                 dev_err(dev, "abx500_get_reg fail %d, %d\n",
 481                         ret, __LINE__);
 482                 return -EINVAL;
 483         }
 484         seq_printf(s, "0x%02X\n", regvalue);
 485
 486         return 0;
 487 }
 488
 489 static int ab8500_val_open(struct inode *inode, struct file *file)
 490 {
 491         return single_open(file, ab8500_val_print, inode->i_private);
 492 }
 493
 494 static ssize_t ab8500_val_write(struct file *file,
 495         const char __user *user_buf,
 496         size_t count, loff_t *ppos)
 497 {
 498         struct device *dev = ((struct seq_file *)(file->private_data))->private;
 499         unsigned long user_val;
 500         int err;
 501
 502         /* Get userspace string and assure termination */
 503         err = kstrtoul_from_user(user_buf, count, 0, &user_val);
 504         if (err)
 505                 return err;
 506
 507         if (user_val > 0xff) {
 508                 dev_err(dev, "debugfs error input > 0xff\n");
 509                 return -EINVAL;
 510         }
 511         err = abx500_set_register_interruptible(dev,
 512                 (u8)debug_bank, debug_address, (u8)user_val);
 513         if (err < 0) {
 514                 printk(KERN_ERR "abx500_set_reg failed %d, %d", err, __LINE__);
 515                 return -EINVAL;
 516         }
 517
 518         return count;
 519 }
 520
 521 static const struct file_operations ab8500_bank_fops = {
 522         .open = ab8500_bank_open,
 523         .write = ab8500_bank_write,
 524         .read = seq_read,
 525         .llseek = seq_lseek,
 526         .release = single_release,
 527         .owner = THIS_MODULE,
 528 };
 529
 530 static const struct file_operations ab8500_address_fops = {
 531         .open = ab8500_address_open,
 532         .write = ab8500_address_write,
 533         .read = seq_read,
 534         .llseek = seq_lseek,
 535         .release = single_release,
 536         .owner = THIS_MODULE,
 537 };
 538
 539 static const struct file_operations ab8500_val_fops = {
 540         .open = ab8500_val_open,
 541         .write = ab8500_val_write,
 542         .read = seq_read,
 543         .llseek = seq_lseek,
 544         .release = single_release,
 545         .owner = THIS_MODULE,
 546 };
 547
 548 static struct dentry *ab8500_dir;
 549 static struct dentry *ab8500_reg_file;
 550 static struct dentry *ab8500_bank_file;
 551 static struct dentry *ab8500_address_file;
 552 static struct dentry *ab8500_val_file;
 553
 554 static int __devinit ab8500_debug_probe(struct platform_device *plf)
 555 {
 556         debug_bank = AB8500_MISC;
 557         debug_address = AB8500_REV_REG & 0x00FF;
 558
 559         ab8500_dir = debugfs_create_dir(AB8500_NAME_STRING, NULL);
 560         if (!ab8500_dir)
 561                 goto exit_no_debugfs;
 562
 563         ab8500_reg_file = debugfs_create_file("all-bank-registers",
 564                 S_IRUGO, ab8500_dir, &plf->dev, &ab8500_registers_fops);
 565         if (!ab8500_reg_file)
 566                 goto exit_destroy_dir;
 567
 568         ab8500_bank_file = debugfs_create_file("register-bank",
 569                 (S_IRUGO | S_IWUSR), ab8500_dir, &plf->dev, &ab8500_bank_fops);
 570         if (!ab8500_bank_file)
 571                 goto exit_destroy_reg;
 572
 573         ab8500_address_file = debugfs_create_file("register-address",
 574                 (S_IRUGO | S_IWUSR), ab8500_dir, &plf->dev,
 575                 &ab8500_address_fops);
 576         if (!ab8500_address_file)
 577                 goto exit_destroy_bank;
 578
 579         ab8500_val_file = debugfs_create_file("register-value",
 580                 (S_IRUGO | S_IWUSR), ab8500_dir, &plf->dev, &ab8500_val_fops);
 581         if (!ab8500_val_file)
 582                 goto exit_destroy_address;
 583
 584         return 0;
 585
 586 exit_destroy_address:
 587         debugfs_remove(ab8500_address_file);
 588 exit_destroy_bank:
 589         debugfs_remove(ab8500_bank_file);
 590 exit_destroy_reg:
 591         debugfs_remove(ab8500_reg_file);
 592 exit_destroy_dir:
 593         debugfs_remove(ab8500_dir);
 594 exit_no_debugfs:
 595         dev_err(&plf->dev, "failed to create debugfs entries.\n");
 596         return -ENOMEM;
 597 }
 598
 599 static int __devexit ab8500_debug_remove(struct platform_device *plf)
 600 {
 601         debugfs_remove(ab8500_val_file);
 602         debugfs_remove(ab8500_address_file);
 603         debugfs_remove(ab8500_bank_file);
 604         debugfs_remove(ab8500_reg_file);
 605         debugfs_remove(ab8500_dir);
 606
 607         return 0;
 608 }
 609
 610 static struct platform_driver ab8500_debug_driver = {
 611         .driver = {
 612                 .name = "ab8500-debug",
 613                 .owner = THIS_MODULE,
 614         },
 615         .probe  = ab8500_debug_probe,
 616         .remove = __devexit_p(ab8500_debug_remove)
 617 };
 618
 619 static int __init ab8500_debug_init(void)
 620 {
 621         return platform_driver_register(&ab8500_debug_driver);
 622 }
 623
 624 static void __exit ab8500_debug_exit(void)
 625 {
 626         platform_driver_unregister(&ab8500_debug_driver);
 627 }
 628 subsys_initcall(ab8500_debug_init);
 629 module_exit(ab8500_debug_exit);
 630
 631 MODULE_AUTHOR("Mattias WALLIN <mattias.wallin@stericsson.com");
 632 MODULE_DESCRIPTION("AB8500 DEBUG");
 633 MODULE_LICENSE("GPL v2");