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 = 0,
 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 = 0,
 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 = 0,
 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 = 0,
 332        },
 333        [0x12] = {
 334                .num_ranges = 0,
 335                .range = 0,
 336        },
 337        [0x13] = {
 338                .num_ranges = 0,
 339                .range = 0,
 340        },
 341        [0x14] = {
 342                .num_ranges = 0,
 343                .range = 0,
 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        char buf[32];
 423        int buf_size;
 424        unsigned long user_bank;
 425        int err;
 426
 427        /* Get userspace string and assure termination */
 428        buf_size = min(count, (sizeof(buf) - 1));
 429        if (copy_from_user(buf, user_buf, buf_size))
 430                return -EFAULT;
 431        buf[buf_size] = 0;
 432
 433        err = strict_strtoul(buf, 0, &user_bank);
 434        if (err)
 435                return -EINVAL;
 436
 437        if (user_bank >= AB8500_NUM_BANKS) {
 438                dev_err(dev, "debugfs error input > number of banks\n");
 439                return -EINVAL;
 440        }
 441
 442        debug_bank = user_bank;
 443
 444        return buf_size;
 445 }
 446
 447 static int ab8500_address_print(struct seq_file *s, void *p)
 448 {
 449        return seq_printf(s, "0x%02X\n", debug_address);
 450 }
 451
 452 static int ab8500_address_open(struct inode *inode, struct file *file)
 453 {
 454        return single_open(file, ab8500_address_print, inode->i_private);
 455 }
 456
 457 static ssize_t ab8500_address_write(struct file *file,
 458        const char __user *user_buf,
 459        size_t count, loff_t *ppos)
 460 {
 461        struct device *dev = ((struct seq_file *)(file->private_data))->private;
 462        char buf[32];
 463        int buf_size;
 464        unsigned long user_address;
 465        int err;
 466
 467        /* Get userspace string and assure termination */
 468        buf_size = min(count, (sizeof(buf) - 1));
 469        if (copy_from_user(buf, user_buf, buf_size))
 470                return -EFAULT;
 471        buf[buf_size] = 0;
 472
 473        err = strict_strtoul(buf, 0, &user_address);
 474        if (err)
 475                return -EINVAL;
 476        if (user_address > 0xff) {
 477                dev_err(dev, "debugfs error input > 0xff\n");
 478                return -EINVAL;
 479        }
 480        debug_address = user_address;
 481        return buf_size;
 482 }
 483
 484 static int ab8500_val_print(struct seq_file *s, void *p)
 485 {
 486        struct device *dev = s->private;
 487        int ret;
 488        u8 regvalue;
 489
 490        ret = abx500_get_register_interruptible(dev,
 491                (u8)debug_bank, (u8)debug_address, &regvalue);
 492        if (ret < 0) {
 493                dev_err(dev, "abx500_get_reg fail %d, %d\n",
 494                        ret, __LINE__);
 495                return -EINVAL;
 496        }
 497        seq_printf(s, "0x%02X\n", regvalue);
 498
 499        return 0;
 500 }
 501
 502 static int ab8500_val_open(struct inode *inode, struct file *file)
 503 {
 504        return single_open(file, ab8500_val_print, inode->i_private);
 505 }
 506
 507 static ssize_t ab8500_val_write(struct file *file,
 508        const char __user *user_buf,
 509        size_t count, loff_t *ppos)
 510 {
 511        struct device *dev = ((struct seq_file *)(file->private_data))->private;
 512        char buf[32];
 513        int buf_size;
 514        unsigned long user_val;
 515        int err;
 516
 517        /* Get userspace string and assure termination */
 518        buf_size = min(count, (sizeof(buf)-1));
 519        if (copy_from_user(buf, user_buf, buf_size))
 520                return -EFAULT;
 521        buf[buf_size] = 0;
 522
 523        err = strict_strtoul(buf, 0, &user_val);
 524        if (err)
 525                return -EINVAL;
 526        if (user_val > 0xff) {
 527                dev_err(dev, "debugfs error input > 0xff\n");
 528                return -EINVAL;
 529        }
 530        err = abx500_set_register_interruptible(dev,
 531                (u8)debug_bank, debug_address, (u8)user_val);
 532        if (err < 0) {
 533                printk(KERN_ERR "abx500_set_reg failed %d, %d", err, __LINE__);
 534                return -EINVAL;
 535        }
 536
 537        return buf_size;
 538 }
 539
 540 static const struct file_operations ab8500_bank_fops = {
 541        .open = ab8500_bank_open,
 542        .write = ab8500_bank_write,
 543        .read = seq_read,
 544        .llseek = seq_lseek,
 545        .release = single_release,
 546        .owner = THIS_MODULE,
 547 };
 548
 549 static const struct file_operations ab8500_address_fops = {
 550        .open = ab8500_address_open,
 551        .write = ab8500_address_write,
 552        .read = seq_read,
 553        .llseek = seq_lseek,
 554        .release = single_release,
 555        .owner = THIS_MODULE,
 556 };
 557
 558 static const struct file_operations ab8500_val_fops = {
 559        .open = ab8500_val_open,
 560        .write = ab8500_val_write,
 561        .read = seq_read,
 562        .llseek = seq_lseek,
 563        .release = single_release,
 564        .owner = THIS_MODULE,
 565 };
 566
 567 static struct dentry *ab8500_dir;
 568 static struct dentry *ab8500_reg_file;
 569 static struct dentry *ab8500_bank_file;
 570 static struct dentry *ab8500_address_file;
 571 static struct dentry *ab8500_val_file;
 572
 573 static int __devinit ab8500_debug_probe(struct platform_device *plf)
 574 {
 575        debug_bank = AB8500_MISC;
 576        debug_address = AB8500_REV_REG & 0x00FF;
 577
 578        ab8500_dir = debugfs_create_dir(AB8500_NAME_STRING, NULL);
 579        if (!ab8500_dir)
 580                goto exit_no_debugfs;
 581
 582        ab8500_reg_file = debugfs_create_file("all-bank-registers",
 583                S_IRUGO, ab8500_dir, &plf->dev, &ab8500_registers_fops);
 584        if (!ab8500_reg_file)
 585                goto exit_destroy_dir;
 586
 587        ab8500_bank_file = debugfs_create_file("register-bank",
 588                (S_IRUGO | S_IWUGO), ab8500_dir, &plf->dev, &ab8500_bank_fops);
 589        if (!ab8500_bank_file)
 590                goto exit_destroy_reg;
 591
 592        ab8500_address_file = debugfs_create_file("register-address",
 593                (S_IRUGO | S_IWUGO), ab8500_dir, &plf->dev,
 594                &ab8500_address_fops);
 595        if (!ab8500_address_file)
 596                goto exit_destroy_bank;
 597
 598        ab8500_val_file = debugfs_create_file("register-value",
 599                (S_IRUGO | S_IWUGO), ab8500_dir, &plf->dev, &ab8500_val_fops);
 600        if (!ab8500_val_file)
 601                goto exit_destroy_address;
 602
 603        return 0;
 604
 605 exit_destroy_address:
 606        debugfs_remove(ab8500_address_file);
 607 exit_destroy_bank:
 608        debugfs_remove(ab8500_bank_file);
 609 exit_destroy_reg:
 610        debugfs_remove(ab8500_reg_file);
 611 exit_destroy_dir:
 612        debugfs_remove(ab8500_dir);
 613 exit_no_debugfs:
 614        dev_err(&plf->dev, "failed to create debugfs entries.\n");
 615        return -ENOMEM;
 616 }
 617
 618 static int __devexit ab8500_debug_remove(struct platform_device *plf)
 619 {
 620        debugfs_remove(ab8500_val_file);
 621        debugfs_remove(ab8500_address_file);
 622        debugfs_remove(ab8500_bank_file);
 623        debugfs_remove(ab8500_reg_file);
 624        debugfs_remove(ab8500_dir);
 625
 626        return 0;
 627 }
 628
 629 static struct platform_driver ab8500_debug_driver = {
 630        .driver = {
 631                .name = "ab8500-debug",
 632                .owner = THIS_MODULE,
 633        },
 634        .probe  = ab8500_debug_probe,
 635        .remove = __devexit_p(ab8500_debug_remove)
 636 };
 637
 638 static int __init ab8500_debug_init(void)
 639 {
 640        return platform_driver_register(&ab8500_debug_driver);
 641 }
 642
 643 static void __exit ab8500_debug_exit(void)
 644 {
 645        platform_driver_unregister(&ab8500_debug_driver);
 646 }
 647 subsys_initcall(ab8500_debug_init);
 648 module_exit(ab8500_debug_exit);
 649
 650 MODULE_AUTHOR("Mattias WALLIN <mattias.wallin@stericsson.com");
 651 MODULE_DESCRIPTION("AB8500 DEBUG");
 652 MODULE_LICENSE("GPL v2");