drivers/mfd/ab3100-core.c

   1 /*
   2  * Copyright (C) 2007-2010 ST-Ericsson
   3  * License terms: GNU General Public License (GPL) version 2
   4  * Low-level core for exclusive access to the AB3100 IC on the I2C bus
   5  * and some basic chip-configuration.
   6  * Author: Linus Walleij <linus.walleij@stericsson.com>
   7  */
   8
   9 #include <linux/i2c.h>
  10 #include <linux/mutex.h>
  11 #include <linux/list.h>
  12 #include <linux/notifier.h>
  13 #include <linux/slab.h>
  14 #include <linux/err.h>
  15 #include <linux/module.h>
  16 #include <linux/platform_device.h>
  17 #include <linux/device.h>
  18 #include <linux/interrupt.h>
  19 #include <linux/random.h>
  20 #include <linux/debugfs.h>
  21 #include <linux/seq_file.h>
  22 #include <linux/uaccess.h>
  23 #include <linux/mfd/core.h>
  24 #include <linux/mfd/abx500.h>
  25
  26 /* These are the only registers inside AB3100 used in this main file */
  27
  28 /* Interrupt event registers */
  29 #define AB3100_EVENTA1          0x21
  30 #define AB3100_EVENTA2          0x22
  31 #define AB3100_EVENTA3          0x23
  32
  33 /* AB3100 DAC converter registers */
  34 #define AB3100_DIS              0x00
  35 #define AB3100_D0C              0x01
  36 #define AB3100_D1C              0x02
  37 #define AB3100_D2C              0x03
  38 #define AB3100_D3C              0x04
  39
  40 /* Chip ID register */
  41 #define AB3100_CID              0x20
  42
  43 /* AB3100 interrupt registers */
  44 #define AB3100_IMRA1            0x24
  45 #define AB3100_IMRA2            0x25
  46 #define AB3100_IMRA3            0x26
  47 #define AB3100_IMRB1            0x2B
  48 #define AB3100_IMRB2            0x2C
  49 #define AB3100_IMRB3            0x2D
  50
  51 /* System Power Monitoring and control registers */
  52 #define AB3100_MCA              0x2E
  53 #define AB3100_MCB              0x2F
  54
  55 /* SIM power up */
  56 #define AB3100_SUP              0x50
  57
  58 /*
  59  * I2C communication
  60  *
  61  * The AB3100 is usually assigned address 0x48 (7-bit)
  62  * The chip is defined in the platform i2c_board_data section.
  63  */
  64 static int ab3100_get_chip_id(struct device *dev)
  65 {
  66         struct ab3100 *ab3100 = dev_get_drvdata(dev->parent);
  67
  68         return (int)ab3100->chip_id;
  69 }
  70
  71 static int ab3100_set_register_interruptible(struct ab3100 *ab3100,
  72         u8 reg, u8 regval)
  73 {
  74         u8 regandval[2] = {reg, regval};
  75         int err;
  76
  77         err = mutex_lock_interruptible(&ab3100->access_mutex);
  78         if (err)
  79                 return err;
  80
  81         /*
  82          * A two-byte write message with the first byte containing the register
  83          * number and the second byte containing the value to be written
  84          * effectively sets a register in the AB3100.
  85          */
  86         err = i2c_master_send(ab3100->i2c_client, regandval, 2);
  87         if (err < 0) {
  88                 dev_err(ab3100->dev,
  89                         "write error (write register): %d\n",
  90                         err);
  91         } else if (err != 2) {
  92                 dev_err(ab3100->dev,
  93                         "write error (write register) "
  94                         "%d bytes transferred (expected 2)\n",
  95                         err);
  96                 err = -EIO;
  97         } else {
  98                 /* All is well */
  99                 err = 0;
 100         }
 101         mutex_unlock(&ab3100->access_mutex);
 102         return err;
 103 }
 104
 105 static int set_register_interruptible(struct device *dev,
 106         u8 bank, u8 reg, u8 value)
 107 {
 108         struct ab3100 *ab3100 = dev_get_drvdata(dev->parent);
 109
 110         return ab3100_set_register_interruptible(ab3100, reg, value);
 111 }
 112
 113 /*
 114  * The test registers exist at an I2C bus address up one
 115  * from the ordinary base. They are not supposed to be used
 116  * in production code, but sometimes you have to do that
 117  * anyway. It's currently only used from this file so declare
 118  * it static and do not export.
 119  */
 120 static int ab3100_set_test_register_interruptible(struct ab3100 *ab3100,
 121                                     u8 reg, u8 regval)
 122 {
 123         u8 regandval[2] = {reg, regval};
 124         int err;
 125
 126         err = mutex_lock_interruptible(&ab3100->access_mutex);
 127         if (err)
 128                 return err;
 129
 130         err = i2c_master_send(ab3100->testreg_client, regandval, 2);
 131         if (err < 0) {
 132                 dev_err(ab3100->dev,
 133                         "write error (write test register): %d\n",
 134                         err);
 135         } else if (err != 2) {
 136                 dev_err(ab3100->dev,
 137                         "write error (write test register) "
 138                         "%d bytes transferred (expected 2)\n",
 139                         err);
 140                 err = -EIO;
 141         } else {
 142                 /* All is well */
 143                 err = 0;
 144         }
 145         mutex_unlock(&ab3100->access_mutex);
 146
 147         return err;
 148 }
 149
 150 static int ab3100_get_register_interruptible(struct ab3100 *ab3100,
 151                                              u8 reg, u8 *regval)
 152 {
 153         int err;
 154
 155         err = mutex_lock_interruptible(&ab3100->access_mutex);
 156         if (err)
 157                 return err;
 158
 159         /*
 160          * AB3100 require an I2C "stop" command between each message, else
 161          * it will not work. The only way of achieveing this with the
 162          * message transport layer is to send the read and write messages
 163          * separately.
 164          */
 165         err = i2c_master_send(ab3100->i2c_client, &reg, 1);
 166         if (err < 0) {
 167                 dev_err(ab3100->dev,
 168                         "write error (send register address): %d\n",
 169                         err);
 170                 goto get_reg_out_unlock;
 171         } else if (err != 1) {
 172                 dev_err(ab3100->dev,
 173                         "write error (send register address) "
 174                         "%d bytes transferred (expected 1)\n",
 175                         err);
 176                 err = -EIO;
 177                 goto get_reg_out_unlock;
 178         } else {
 179                 /* All is well */
 180                 err = 0;
 181         }
 182
 183         err = i2c_master_recv(ab3100->i2c_client, regval, 1);
 184         if (err < 0) {
 185                 dev_err(ab3100->dev,
 186                         "write error (read register): %d\n",
 187                         err);
 188                 goto get_reg_out_unlock;
 189         } else if (err != 1) {
 190                 dev_err(ab3100->dev,
 191                         "write error (read register) "
 192                         "%d bytes transferred (expected 1)\n",
 193                         err);
 194                 err = -EIO;
 195                 goto get_reg_out_unlock;
 196         } else {
 197                 /* All is well */
 198                 err = 0;
 199         }
 200
 201  get_reg_out_unlock:
 202         mutex_unlock(&ab3100->access_mutex);
 203         return err;
 204 }
 205
 206 static int get_register_interruptible(struct device *dev, u8 bank, u8 reg,
 207                                       u8 *value)
 208 {
 209         struct ab3100 *ab3100 = dev_get_drvdata(dev->parent);
 210
 211         return ab3100_get_register_interruptible(ab3100, reg, value);
 212 }
 213
 214 static int ab3100_get_register_page_interruptible(struct ab3100 *ab3100,
 215                              u8 first_reg, u8 *regvals, u8 numregs)
 216 {
 217         int err;
 218
 219         if (ab3100->chip_id == 0xa0 ||
 220             ab3100->chip_id == 0xa1)
 221                 /* These don't support paged reads */
 222                 return -EIO;
 223
 224         err = mutex_lock_interruptible(&ab3100->access_mutex);
 225         if (err)
 226                 return err;
 227
 228         /*
 229          * Paged read also require an I2C "stop" command.
 230          */
 231         err = i2c_master_send(ab3100->i2c_client, &first_reg, 1);
 232         if (err < 0) {
 233                 dev_err(ab3100->dev,
 234                         "write error (send first register address): %d\n",
 235                         err);
 236                 goto get_reg_page_out_unlock;
 237         } else if (err != 1) {
 238                 dev_err(ab3100->dev,
 239                         "write error (send first register address) "
 240                         "%d bytes transferred (expected 1)\n",
 241                         err);
 242                 err = -EIO;
 243                 goto get_reg_page_out_unlock;
 244         }
 245
 246         err = i2c_master_recv(ab3100->i2c_client, regvals, numregs);
 247         if (err < 0) {
 248                 dev_err(ab3100->dev,
 249                         "write error (read register page): %d\n",
 250                         err);
 251                 goto get_reg_page_out_unlock;
 252         } else if (err != numregs) {
 253                 dev_err(ab3100->dev,
 254                         "write error (read register page) "
 255                         "%d bytes transferred (expected %d)\n",
 256                         err, numregs);
 257                 err = -EIO;
 258                 goto get_reg_page_out_unlock;
 259         }
 260
 261         /* All is well */
 262         err = 0;
 263
 264  get_reg_page_out_unlock:
 265         mutex_unlock(&ab3100->access_mutex);
 266         return err;
 267 }
 268
 269 static int get_register_page_interruptible(struct device *dev, u8 bank,
 270         u8 first_reg, u8 *regvals, u8 numregs)
 271 {
 272         struct ab3100 *ab3100 = dev_get_drvdata(dev->parent);
 273
 274         return ab3100_get_register_page_interruptible(ab3100,
 275                         first_reg, regvals, numregs);
 276 }
 277
 278 static int ab3100_mask_and_set_register_interruptible(struct ab3100 *ab3100,
 279                                  u8 reg, u8 andmask, u8 ormask)
 280 {
 281         u8 regandval[2] = {reg, 0};
 282         int err;
 283
 284         err = mutex_lock_interruptible(&ab3100->access_mutex);
 285         if (err)
 286                 return err;
 287
 288         /* First read out the target register */
 289         err = i2c_master_send(ab3100->i2c_client, &reg, 1);
 290         if (err < 0) {
 291                 dev_err(ab3100->dev,
 292                         "write error (maskset send address): %d\n",
 293                         err);
 294                 goto get_maskset_unlock;
 295         } else if (err != 1) {
 296                 dev_err(ab3100->dev,
 297                         "write error (maskset send address) "
 298                         "%d bytes transferred (expected 1)\n",
 299                         err);
 300                 err = -EIO;
 301                 goto get_maskset_unlock;
 302         }
 303
 304         err = i2c_master_recv(ab3100->i2c_client, &regandval[1], 1);
 305         if (err < 0) {
 306                 dev_err(ab3100->dev,
 307                         "write error (maskset read register): %d\n",
 308                         err);
 309                 goto get_maskset_unlock;
 310         } else if (err != 1) {
 311                 dev_err(ab3100->dev,
 312                         "write error (maskset read register) "
 313                         "%d bytes transferred (expected 1)\n",
 314                         err);
 315                 err = -EIO;
 316                 goto get_maskset_unlock;
 317         }
 318
 319         /* Modify the register */
 320         regandval[1] &= andmask;
 321         regandval[1] |= ormask;
 322
 323         /* Write the register */
 324         err = i2c_master_send(ab3100->i2c_client, regandval, 2);
 325         if (err < 0) {
 326                 dev_err(ab3100->dev,
 327                         "write error (write register): %d\n",
 328                         err);
 329                 goto get_maskset_unlock;
 330         } else if (err != 2) {
 331                 dev_err(ab3100->dev,
 332                         "write error (write register) "
 333                         "%d bytes transferred (expected 2)\n",
 334                         err);
 335                 err = -EIO;
 336                 goto get_maskset_unlock;
 337         }
 338
 339         /* All is well */
 340         err = 0;
 341
 342  get_maskset_unlock:
 343         mutex_unlock(&ab3100->access_mutex);
 344         return err;
 345 }
 346
 347 static int mask_and_set_register_interruptible(struct device *dev, u8 bank,
 348         u8 reg, u8 bitmask, u8 bitvalues)
 349 {
 350         struct ab3100 *ab3100 = dev_get_drvdata(dev->parent);
 351
 352         return ab3100_mask_and_set_register_interruptible(ab3100,
 353                         reg, bitmask, (bitmask & bitvalues));
 354 }
 355
 356 /*
 357  * Register a simple callback for handling any AB3100 events.
 358  */
 359 int ab3100_event_register(struct ab3100 *ab3100,
 360                           struct notifier_block *nb)
 361 {
 362         return blocking_notifier_chain_register(&ab3100->event_subscribers,
 363                                                nb);
 364 }
 365 EXPORT_SYMBOL(ab3100_event_register);
 366
 367 /*
 368  * Remove a previously registered callback.
 369  */
 370 int ab3100_event_unregister(struct ab3100 *ab3100,
 371                             struct notifier_block *nb)
 372 {
 373   return blocking_notifier_chain_unregister(&ab3100->event_subscribers,
 374                                             nb);
 375 }
 376 EXPORT_SYMBOL(ab3100_event_unregister);
 377
 378
 379 static int ab3100_event_registers_startup_state_get(struct device *dev,
 380                                              u8 *event)
 381 {
 382         struct ab3100 *ab3100 = dev_get_drvdata(dev->parent);
 383         if (!ab3100->startup_events_read)
 384                 return -EAGAIN; /* Try again later */
 385         memcpy(event, ab3100->startup_events, 3);
 386         return 0;
 387 }
 388
 389 static struct abx500_ops ab3100_ops = {
 390         .get_chip_id = ab3100_get_chip_id,
 391         .set_register = set_register_interruptible,
 392         .get_register = get_register_interruptible,
 393         .get_register_page = get_register_page_interruptible,
 394         .set_register_page = NULL,
 395         .mask_and_set_register = mask_and_set_register_interruptible,
 396         .event_registers_startup_state_get =
 397                 ab3100_event_registers_startup_state_get,
 398         .startup_irq_enabled = NULL,
 399 };
 400
 401 /*
 402  * This is a threaded interrupt handler so we can make some
 403  * I2C calls etc.
 404  */
 405 static irqreturn_t ab3100_irq_handler(int irq, void *data)
 406 {
 407         struct ab3100 *ab3100 = data;
 408         u8 event_regs[3];
 409         u32 fatevent;
 410         int err;
 411
 412         add_interrupt_randomness(irq);
 413
 414         err = ab3100_get_register_page_interruptible(ab3100, AB3100_EVENTA1,
 415                                        event_regs, 3);
 416         if (err)
 417                 goto err_event;
 418
 419         fatevent = (event_regs[0] << 16) |
 420                 (event_regs[1] << 8) |
 421                 event_regs[2];
 422
 423         if (!ab3100->startup_events_read) {
 424                 ab3100->startup_events[0] = event_regs[0];
 425                 ab3100->startup_events[1] = event_regs[1];
 426                 ab3100->startup_events[2] = event_regs[2];
 427                 ab3100->startup_events_read = true;
 428         }
 429         /*
 430          * The notified parties will have to mask out the events
 431          * they're interested in and react to them. They will be
 432          * notified on all events, then they use the fatevent value
 433          * to determine if they're interested.
 434          */
 435         blocking_notifier_call_chain(&ab3100->event_subscribers,
 436                                      fatevent, NULL);
 437
 438         dev_dbg(ab3100->dev,
 439                 "IRQ Event: 0x%08x\n", fatevent);
 440
 441         return IRQ_HANDLED;
 442
 443  err_event:
 444         dev_dbg(ab3100->dev,
 445                 "error reading event status\n");
 446         return IRQ_HANDLED;
 447 }
 448
 449 #ifdef CONFIG_DEBUG_FS
 450 /*
 451  * Some debugfs entries only exposed if we're using debug
 452  */
 453 static int ab3100_registers_print(struct seq_file *s, void *p)
 454 {
 455         struct ab3100 *ab3100 = s->private;
 456         u8 value;
 457         u8 reg;
 458
 459         seq_printf(s, "AB3100 registers:\n");
 460
 461         for (reg = 0; reg < 0xff; reg++) {
 462                 ab3100_get_register_interruptible(ab3100, reg, &value);
 463                 seq_printf(s, "[0x%x]:  0x%x\n", reg, value);
 464         }
 465         return 0;
 466 }
 467
 468 static int ab3100_registers_open(struct inode *inode, struct file *file)
 469 {
 470         return single_open(file, ab3100_registers_print, inode->i_private);
 471 }
 472
 473 static const struct file_operations ab3100_registers_fops = {
 474         .open = ab3100_registers_open,
 475         .read = seq_read,
 476         .llseek = seq_lseek,
 477         .release = single_release,
 478         .owner = THIS_MODULE,
 479 };
 480
 481 struct ab3100_get_set_reg_priv {
 482         struct ab3100 *ab3100;
 483         bool mode;
 484 };
 485
 486 static ssize_t ab3100_get_set_reg(struct file *file,
 487                                   const char __user *user_buf,
 488                                   size_t count, loff_t *ppos)
 489 {
 490         struct ab3100_get_set_reg_priv *priv = file->private_data;
 491         struct ab3100 *ab3100 = priv->ab3100;
 492         char buf[32];
 493         ssize_t buf_size;
 494         int regp;
 495         unsigned long user_reg;
 496         int err;
 497         int i = 0;
 498
 499         /* Get userspace string and assure termination */
 500         buf_size = min(count, (sizeof(buf)-1));
 501         if (copy_from_user(buf, user_buf, buf_size))
 502                 return -EFAULT;
 503         buf[buf_size] = 0;
 504
 505         /*
 506          * The idea is here to parse a string which is either
 507          * "0xnn" for reading a register, or "0xaa 0xbb" for
 508          * writing 0xbb to the register 0xaa. First move past
 509          * whitespace and then begin to parse the register.
 510          */
 511         while ((i < buf_size) && (buf[i] == ' '))
 512                 i++;
 513         regp = i;
 514
 515         /*
 516          * Advance pointer to end of string then terminate
 517          * the register string. This is needed to satisfy
 518          * the strict_strtoul() function.
 519          */
 520         while ((i < buf_size) && (buf[i] != ' '))
 521                 i++;
 522         buf[i] = '\0';
 523
 524         err = strict_strtoul(&buf[regp], 16, &user_reg);
 525         if (err)
 526                 return err;
 527         if (user_reg > 0xff)
 528                 return -EINVAL;
 529
 530         /* Either we read or we write a register here */
 531         if (!priv->mode) {
 532                 /* Reading */
 533                 u8 reg = (u8) user_reg;
 534                 u8 regvalue;
 535
 536                 ab3100_get_register_interruptible(ab3100, reg, &regvalue);
 537
 538                 dev_info(ab3100->dev,
 539                          "debug read AB3100 reg[0x%02x]: 0x%02x\n",
 540                          reg, regvalue);
 541         } else {
 542                 int valp;
 543                 unsigned long user_value;
 544                 u8 reg = (u8) user_reg;
 545                 u8 value;
 546                 u8 regvalue;
 547
 548                 /*
 549                  * Writing, we need some value to write to
 550                  * the register so keep parsing the string
 551                  * from userspace.
 552                  */
 553                 i++;
 554                 while ((i < buf_size) && (buf[i] == ' '))
 555                         i++;
 556                 valp = i;
 557                 while ((i < buf_size) && (buf[i] != ' '))
 558                         i++;
 559                 buf[i] = '\0';
 560
 561                 err = strict_strtoul(&buf[valp], 16, &user_value);
 562                 if (err)
 563                         return err;
 564                 if (user_reg > 0xff)
 565                         return -EINVAL;
 566
 567                 value = (u8) user_value;
 568                 ab3100_set_register_interruptible(ab3100, reg, value);
 569                 ab3100_get_register_interruptible(ab3100, reg, &regvalue);
 570
 571                 dev_info(ab3100->dev,
 572                          "debug write reg[0x%02x] with 0x%02x, "
 573                          "after readback: 0x%02x\n",
 574                          reg, value, regvalue);
 575         }
 576         return buf_size;
 577 }
 578
 579 static const struct file_operations ab3100_get_set_reg_fops = {
 580         .open = simple_open,
 581         .write = ab3100_get_set_reg,
 582         .llseek = noop_llseek,
 583 };
 584
 585 static struct dentry *ab3100_dir;
 586 static struct dentry *ab3100_reg_file;
 587 static struct ab3100_get_set_reg_priv ab3100_get_priv;
 588 static struct dentry *ab3100_get_reg_file;
 589 static struct ab3100_get_set_reg_priv ab3100_set_priv;
 590 static struct dentry *ab3100_set_reg_file;
 591
 592 static void ab3100_setup_debugfs(struct ab3100 *ab3100)
 593 {
 594         int err;
 595
 596         ab3100_dir = debugfs_create_dir("ab3100", NULL);
 597         if (!ab3100_dir)
 598                 goto exit_no_debugfs;
 599
 600         ab3100_reg_file = debugfs_create_file("registers",
 601                                 S_IRUGO, ab3100_dir, ab3100,
 602                                 &ab3100_registers_fops);
 603         if (!ab3100_reg_file) {
 604                 err = -ENOMEM;
 605                 goto exit_destroy_dir;
 606         }
 607
 608         ab3100_get_priv.ab3100 = ab3100;
 609         ab3100_get_priv.mode = false;
 610         ab3100_get_reg_file = debugfs_create_file("get_reg",
 611                                 S_IWUSR, ab3100_dir, &ab3100_get_priv,
 612                                 &ab3100_get_set_reg_fops);
 613         if (!ab3100_get_reg_file) {
 614                 err = -ENOMEM;
 615                 goto exit_destroy_reg;
 616         }
 617
 618         ab3100_set_priv.ab3100 = ab3100;
 619         ab3100_set_priv.mode = true;
 620         ab3100_set_reg_file = debugfs_create_file("set_reg",
 621                                 S_IWUSR, ab3100_dir, &ab3100_set_priv,
 622                                 &ab3100_get_set_reg_fops);
 623         if (!ab3100_set_reg_file) {
 624                 err = -ENOMEM;
 625                 goto exit_destroy_get_reg;
 626         }
 627         return;
 628
 629  exit_destroy_get_reg:
 630         debugfs_remove(ab3100_get_reg_file);
 631  exit_destroy_reg:
 632         debugfs_remove(ab3100_reg_file);
 633  exit_destroy_dir:
 634         debugfs_remove(ab3100_dir);
 635  exit_no_debugfs:
 636         return;
 637 }
 638 static inline void ab3100_remove_debugfs(void)
 639 {
 640         debugfs_remove(ab3100_set_reg_file);
 641         debugfs_remove(ab3100_get_reg_file);
 642         debugfs_remove(ab3100_reg_file);
 643         debugfs_remove(ab3100_dir);
 644 }
 645 #else
 646 static inline void ab3100_setup_debugfs(struct ab3100 *ab3100)
 647 {
 648 }
 649 static inline void ab3100_remove_debugfs(void)
 650 {
 651 }
 652 #endif
 653
 654 /*
 655  * Basic set-up, datastructure creation/destruction and I2C interface.
 656  * This sets up a default config in the AB3100 chip so that it
 657  * will work as expected.
 658  */
 659
 660 struct ab3100_init_setting {
 661         u8 abreg;
 662         u8 setting;
 663 };
 664
 665 static const struct ab3100_init_setting __devinitconst
 666 ab3100_init_settings[] = {
 667         {
 668                 .abreg = AB3100_MCA,
 669                 .setting = 0x01
 670         }, {
 671                 .abreg = AB3100_MCB,
 672                 .setting = 0x30
 673         }, {
 674                 .abreg = AB3100_IMRA1,
 675                 .setting = 0x00
 676         }, {
 677                 .abreg = AB3100_IMRA2,
 678                 .setting = 0xFF
 679         }, {
 680                 .abreg = AB3100_IMRA3,
 681                 .setting = 0x01
 682         }, {
 683                 .abreg = AB3100_IMRB1,
 684                 .setting = 0xBF
 685         }, {
 686                 .abreg = AB3100_IMRB2,
 687                 .setting = 0xFF
 688         }, {
 689                 .abreg = AB3100_IMRB3,
 690                 .setting = 0xFF
 691         }, {
 692                 .abreg = AB3100_SUP,
 693                 .setting = 0x00
 694         }, {
 695                 .abreg = AB3100_DIS,
 696                 .setting = 0xF0
 697         }, {
 698                 .abreg = AB3100_D0C,
 699                 .setting = 0x00
 700         }, {
 701                 .abreg = AB3100_D1C,
 702                 .setting = 0x00
 703         }, {
 704                 .abreg = AB3100_D2C,
 705                 .setting = 0x00
 706         }, {
 707                 .abreg = AB3100_D3C,
 708                 .setting = 0x00
 709         },
 710 };
 711
 712 static int __devinit ab3100_setup(struct ab3100 *ab3100)
 713 {
 714         int err = 0;
 715         int i;
 716
 717         for (i = 0; i < ARRAY_SIZE(ab3100_init_settings); i++) {
 718                 err = ab3100_set_register_interruptible(ab3100,
 719                                           ab3100_init_settings[i].abreg,
 720                                           ab3100_init_settings[i].setting);
 721                 if (err)
 722                         goto exit_no_setup;
 723         }
 724
 725         /*
 726          * Special trick to make the AB3100 use the 32kHz clock (RTC)
 727          * bit 3 in test register 0x02 is a special, undocumented test
 728          * register bit that only exist in AB3100 P1E
 729          */
 730         if (ab3100->chip_id == 0xc4) {
 731                 dev_warn(ab3100->dev,
 732                          "AB3100 P1E variant detected, "
 733                          "forcing chip to 32KHz\n");
 734                 err = ab3100_set_test_register_interruptible(ab3100,
 735                         0x02, 0x08);
 736         }
 737
 738  exit_no_setup:
 739         return err;
 740 }
 741
 742 /* The subdevices of the AB3100 */
 743 static struct mfd_cell ab3100_devs[] = {
 744         {
 745                 .name = "ab3100-dac",
 746                 .id = -1,
 747         },
 748         {
 749                 .name = "ab3100-leds",
 750                 .id = -1,
 751         },
 752         {
 753                 .name = "ab3100-power",
 754                 .id = -1,
 755         },
 756         {
 757                 .name = "ab3100-regulators",
 758                 .id = -1,
 759         },
 760         {
 761                 .name = "ab3100-sim",
 762                 .id = -1,
 763         },
 764         {
 765                 .name = "ab3100-uart",
 766                 .id = -1,
 767         },
 768         {
 769                 .name = "ab3100-rtc",
 770                 .id = -1,
 771         },
 772         {
 773                 .name = "ab3100-charger",
 774                 .id = -1,
 775         },
 776         {
 777                 .name = "ab3100-boost",
 778                 .id = -1,
 779         },
 780         {
 781                 .name = "ab3100-adc",
 782                 .id = -1,
 783         },
 784         {
 785                 .name = "ab3100-fuelgauge",
 786                 .id = -1,
 787         },
 788         {
 789                 .name = "ab3100-vibrator",
 790                 .id = -1,
 791         },
 792         {
 793                 .name = "ab3100-otp",
 794                 .id = -1,
 795         },
 796         {
 797                 .name = "ab3100-codec",
 798                 .id = -1,
 799         },
 800 };
 801
 802 struct ab_family_id {
 803         u8      id;
 804         char    *name;
 805 };
 806
 807 static const struct ab_family_id ids[] __devinitconst = {
 808         /* AB3100 */
 809         {
 810                 .id = 0xc0,
 811                 .name = "P1A"
 812         }, {
 813                 .id = 0xc1,
 814                 .name = "P1B"
 815         }, {
 816                 .id = 0xc2,
 817                 .name = "P1C"
 818         }, {
 819                 .id = 0xc3,
 820                 .name = "P1D"
 821         }, {
 822                 .id = 0xc4,
 823                 .name = "P1E"
 824         }, {
 825                 .id = 0xc5,
 826                 .name = "P1F/R1A"
 827         }, {
 828                 .id = 0xc6,
 829                 .name = "P1G/R1A"
 830         }, {
 831                 .id = 0xc7,
 832                 .name = "P2A/R2A"
 833         }, {
 834                 .id = 0xc8,
 835                 .name = "P2B/R2B"
 836         },
 837         /* AB3000 variants, not supported */
 838         {
 839                 .id = 0xa0
 840         }, {
 841                 .id = 0xa1
 842         }, {
 843                 .id = 0xa2
 844         }, {
 845                 .id = 0xa3
 846         }, {
 847                 .id = 0xa4
 848         }, {
 849                 .id = 0xa5
 850         }, {
 851                 .id = 0xa6
 852         }, {
 853                 .id = 0xa7
 854         },
 855         /* Terminator */
 856         {
 857                 .id = 0x00,
 858         },
 859 };
 860
 861 static int __devinit ab3100_probe(struct i2c_client *client,
 862                                   const struct i2c_device_id *id)
 863 {
 864         struct ab3100 *ab3100;
 865         struct ab3100_platform_data *ab3100_plf_data =
 866                 client->dev.platform_data;
 867         int err;
 868         int i;
 869
 870         ab3100 = kzalloc(sizeof(struct ab3100), GFP_KERNEL);
 871         if (!ab3100) {
 872                 dev_err(&client->dev, "could not allocate AB3100 device\n");
 873                 return -ENOMEM;
 874         }
 875
 876         /* Initialize data structure */
 877         mutex_init(&ab3100->access_mutex);
 878         BLOCKING_INIT_NOTIFIER_HEAD(&ab3100->event_subscribers);
 879
 880         ab3100->i2c_client = client;
 881         ab3100->dev = &ab3100->i2c_client->dev;
 882
 883         i2c_set_clientdata(client, ab3100);
 884
 885         /* Read chip ID register */
 886         err = ab3100_get_register_interruptible(ab3100, AB3100_CID,
 887                                                 &ab3100->chip_id);
 888         if (err) {
 889                 dev_err(&client->dev,
 890                         "could not communicate with the AB3100 analog "
 891                         "baseband chip\n");
 892                 goto exit_no_detect;
 893         }
 894
 895         for (i = 0; ids[i].id != 0x0; i++) {
 896                 if (ids[i].id == ab3100->chip_id) {
 897                         if (ids[i].name != NULL) {
 898                                 snprintf(&ab3100->chip_name[0],
 899                                          sizeof(ab3100->chip_name) - 1,
 900                                          "AB3100 %s",
 901                                          ids[i].name);
 902                                 break;
 903                         } else {
 904                                 dev_err(&client->dev,
 905                                         "AB3000 is not supported\n");
 906                                 goto exit_no_detect;
 907                         }
 908                 }
 909         }
 910
 911         if (ids[i].id == 0x0) {
 912                 dev_err(&client->dev, "unknown analog baseband chip id: 0x%x\n",
 913                         ab3100->chip_id);
 914                 dev_err(&client->dev, "accepting it anyway. Please update "
 915                         "the driver.\n");
 916                 goto exit_no_detect;
 917         }
 918
 919         dev_info(&client->dev, "Detected chip: %s\n",
 920                  &ab3100->chip_name[0]);
 921
 922         /* Attach a second dummy i2c_client to the test register address */
 923         ab3100->testreg_client = i2c_new_dummy(client->adapter,
 924                                                      client->addr + 1);
 925         if (!ab3100->testreg_client) {
 926                 err = -ENOMEM;
 927                 goto exit_no_testreg_client;
 928         }
 929
 930         err = ab3100_setup(ab3100);
 931         if (err)
 932                 goto exit_no_setup;
 933
 934         err = request_threaded_irq(client->irq, NULL, ab3100_irq_handler,
 935                                 IRQF_ONESHOT, "ab3100-core", ab3100);
 936         /* This real unpredictable IRQ is of course sampled for entropy */
 937         rand_initialize_irq(client->irq);
 938
 939         if (err)
 940                 goto exit_no_irq;
 941
 942         err = abx500_register_ops(&client->dev, &ab3100_ops);
 943         if (err)
 944                 goto exit_no_ops;
 945
 946         /* Set up and register the platform devices. */
 947         for (i = 0; i < ARRAY_SIZE(ab3100_devs); i++) {
 948                 ab3100_devs[i].platform_data = ab3100_plf_data;
 949                 ab3100_devs[i].pdata_size = sizeof(struct ab3100_platform_data);
 950         }
 951
 952         err = mfd_add_devices(&client->dev, 0, ab3100_devs,
 953                 ARRAY_SIZE(ab3100_devs), NULL, 0);
 954
 955         ab3100_setup_debugfs(ab3100);
 956
 957         return 0;
 958
 959  exit_no_ops:
 960  exit_no_irq:
 961  exit_no_setup:
 962         i2c_unregister_device(ab3100->testreg_client);
 963  exit_no_testreg_client:
 964  exit_no_detect:
 965         kfree(ab3100);
 966         return err;
 967 }
 968
 969 static int __devexit ab3100_remove(struct i2c_client *client)
 970 {
 971         struct ab3100 *ab3100 = i2c_get_clientdata(client);
 972
 973         /* Unregister subdevices */
 974         mfd_remove_devices(&client->dev);
 975
 976         ab3100_remove_debugfs();
 977         i2c_unregister_device(ab3100->testreg_client);
 978
 979         /*
 980          * At this point, all subscribers should have unregistered
 981          * their notifiers so deactivate IRQ
 982          */
 983         free_irq(client->irq, ab3100);
 984         kfree(ab3100);
 985         return 0;
 986 }
 987
 988 static const struct i2c_device_id ab3100_id[] = {
 989         { "ab3100", 0 },
 990         { }
 991 };
 992 MODULE_DEVICE_TABLE(i2c, ab3100_id);
 993
 994 static struct i2c_driver ab3100_driver = {
 995         .driver = {
 996                 .name   = "ab3100",
 997                 .owner  = THIS_MODULE,
 998         },
 999         .id_table       = ab3100_id,
1000         .probe          = ab3100_probe,
1001         .remove         = __devexit_p(ab3100_remove),
1002 };
1003
1004 static int __init ab3100_i2c_init(void)
1005 {
1006         return i2c_add_driver(&ab3100_driver);
1007 }
1008
1009 static void __exit ab3100_i2c_exit(void)
1010 {
1011         i2c_del_driver(&ab3100_driver);
1012 }
1013
1014 subsys_initcall(ab3100_i2c_init);
1015 module_exit(ab3100_i2c_exit);
1016
1017 MODULE_AUTHOR("Linus Walleij <linus.walleij@stericsson.com>");
1018 MODULE_DESCRIPTION("AB3100 core driver");
1019 MODULE_LICENSE("GPL");