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         err = ab3100_get_register_page_interruptible(ab3100, AB3100_EVENTA1,
 413                                        event_regs, 3);
 414         if (err)
 415                 goto err_event;
 416
 417         fatevent = (event_regs[0] << 16) |
 418                 (event_regs[1] << 8) |
 419                 event_regs[2];
 420
 421         if (!ab3100->startup_events_read) {
 422                 ab3100->startup_events[0] = event_regs[0];
 423                 ab3100->startup_events[1] = event_regs[1];
 424                 ab3100->startup_events[2] = event_regs[2];
 425                 ab3100->startup_events_read = true;
 426         }
 427         /*
 428          * The notified parties will have to mask out the events
 429          * they're interested in and react to them. They will be
 430          * notified on all events, then they use the fatevent value
 431          * to determine if they're interested.
 432          */
 433         blocking_notifier_call_chain(&ab3100->event_subscribers,
 434                                      fatevent, NULL);
 435
 436         dev_dbg(ab3100->dev,
 437                 "IRQ Event: 0x%08x\n", fatevent);
 438
 439         return IRQ_HANDLED;
 440
 441  err_event:
 442         dev_dbg(ab3100->dev,
 443                 "error reading event status\n");
 444         return IRQ_HANDLED;
 445 }
 446
 447 #ifdef CONFIG_DEBUG_FS
 448 /*
 449  * Some debugfs entries only exposed if we're using debug
 450  */
 451 static int ab3100_registers_print(struct seq_file *s, void *p)
 452 {
 453         struct ab3100 *ab3100 = s->private;
 454         u8 value;
 455         u8 reg;
 456
 457         seq_printf(s, "AB3100 registers:\n");
 458
 459         for (reg = 0; reg < 0xff; reg++) {
 460                 ab3100_get_register_interruptible(ab3100, reg, &value);
 461                 seq_printf(s, "[0x%x]:  0x%x\n", reg, value);
 462         }
 463         return 0;
 464 }
 465
 466 static int ab3100_registers_open(struct inode *inode, struct file *file)
 467 {
 468         return single_open(file, ab3100_registers_print, inode->i_private);
 469 }
 470
 471 static const struct file_operations ab3100_registers_fops = {
 472         .open = ab3100_registers_open,
 473         .read = seq_read,
 474         .llseek = seq_lseek,
 475         .release = single_release,
 476         .owner = THIS_MODULE,
 477 };
 478
 479 struct ab3100_get_set_reg_priv {
 480         struct ab3100 *ab3100;
 481         bool mode;
 482 };
 483
 484 static ssize_t ab3100_get_set_reg(struct file *file,
 485                                   const char __user *user_buf,
 486                                   size_t count, loff_t *ppos)
 487 {
 488         struct ab3100_get_set_reg_priv *priv = file->private_data;
 489         struct ab3100 *ab3100 = priv->ab3100;
 490         char buf[32];
 491         ssize_t buf_size;
 492         int regp;
 493         unsigned long user_reg;
 494         int err;
 495         int i = 0;
 496
 497         /* Get userspace string and assure termination */
 498         buf_size = min(count, (sizeof(buf)-1));
 499         if (copy_from_user(buf, user_buf, buf_size))
 500                 return -EFAULT;
 501         buf[buf_size] = 0;
 502
 503         /*
 504          * The idea is here to parse a string which is either
 505          * "0xnn" for reading a register, or "0xaa 0xbb" for
 506          * writing 0xbb to the register 0xaa. First move past
 507          * whitespace and then begin to parse the register.
 508          */
 509         while ((i < buf_size) && (buf[i] == ' '))
 510                 i++;
 511         regp = i;
 512
 513         /*
 514          * Advance pointer to end of string then terminate
 515          * the register string. This is needed to satisfy
 516          * the strict_strtoul() function.
 517          */
 518         while ((i < buf_size) && (buf[i] != ' '))
 519                 i++;
 520         buf[i] = '\0';
 521
 522         err = strict_strtoul(&buf[regp], 16, &user_reg);
 523         if (err)
 524                 return err;
 525         if (user_reg > 0xff)
 526                 return -EINVAL;
 527
 528         /* Either we read or we write a register here */
 529         if (!priv->mode) {
 530                 /* Reading */
 531                 u8 reg = (u8) user_reg;
 532                 u8 regvalue;
 533
 534                 ab3100_get_register_interruptible(ab3100, reg, &regvalue);
 535
 536                 dev_info(ab3100->dev,
 537                          "debug read AB3100 reg[0x%02x]: 0x%02x\n",
 538                          reg, regvalue);
 539         } else {
 540                 int valp;
 541                 unsigned long user_value;
 542                 u8 reg = (u8) user_reg;
 543                 u8 value;
 544                 u8 regvalue;
 545
 546                 /*
 547                  * Writing, we need some value to write to
 548                  * the register so keep parsing the string
 549                  * from userspace.
 550                  */
 551                 i++;
 552                 while ((i < buf_size) && (buf[i] == ' '))
 553                         i++;
 554                 valp = i;
 555                 while ((i < buf_size) && (buf[i] != ' '))
 556                         i++;
 557                 buf[i] = '\0';
 558
 559                 err = strict_strtoul(&buf[valp], 16, &user_value);
 560                 if (err)
 561                         return err;
 562                 if (user_reg > 0xff)
 563                         return -EINVAL;
 564
 565                 value = (u8) user_value;
 566                 ab3100_set_register_interruptible(ab3100, reg, value);
 567                 ab3100_get_register_interruptible(ab3100, reg, &regvalue);
 568
 569                 dev_info(ab3100->dev,
 570                          "debug write reg[0x%02x] with 0x%02x, "
 571                          "after readback: 0x%02x\n",
 572                          reg, value, regvalue);
 573         }
 574         return buf_size;
 575 }
 576
 577 static const struct file_operations ab3100_get_set_reg_fops = {
 578         .open = simple_open,
 579         .write = ab3100_get_set_reg,
 580         .llseek = noop_llseek,
 581 };
 582
 583 static struct dentry *ab3100_dir;
 584 static struct dentry *ab3100_reg_file;
 585 static struct ab3100_get_set_reg_priv ab3100_get_priv;
 586 static struct dentry *ab3100_get_reg_file;
 587 static struct ab3100_get_set_reg_priv ab3100_set_priv;
 588 static struct dentry *ab3100_set_reg_file;
 589
 590 static void ab3100_setup_debugfs(struct ab3100 *ab3100)
 591 {
 592         int err;
 593
 594         ab3100_dir = debugfs_create_dir("ab3100", NULL);
 595         if (!ab3100_dir)
 596                 goto exit_no_debugfs;
 597
 598         ab3100_reg_file = debugfs_create_file("registers",
 599                                 S_IRUGO, ab3100_dir, ab3100,
 600                                 &ab3100_registers_fops);
 601         if (!ab3100_reg_file) {
 602                 err = -ENOMEM;
 603                 goto exit_destroy_dir;
 604         }
 605
 606         ab3100_get_priv.ab3100 = ab3100;
 607         ab3100_get_priv.mode = false;
 608         ab3100_get_reg_file = debugfs_create_file("get_reg",
 609                                 S_IWUSR, ab3100_dir, &ab3100_get_priv,
 610                                 &ab3100_get_set_reg_fops);
 611         if (!ab3100_get_reg_file) {
 612                 err = -ENOMEM;
 613                 goto exit_destroy_reg;
 614         }
 615
 616         ab3100_set_priv.ab3100 = ab3100;
 617         ab3100_set_priv.mode = true;
 618         ab3100_set_reg_file = debugfs_create_file("set_reg",
 619                                 S_IWUSR, ab3100_dir, &ab3100_set_priv,
 620                                 &ab3100_get_set_reg_fops);
 621         if (!ab3100_set_reg_file) {
 622                 err = -ENOMEM;
 623                 goto exit_destroy_get_reg;
 624         }
 625         return;
 626
 627  exit_destroy_get_reg:
 628         debugfs_remove(ab3100_get_reg_file);
 629  exit_destroy_reg:
 630         debugfs_remove(ab3100_reg_file);
 631  exit_destroy_dir:
 632         debugfs_remove(ab3100_dir);
 633  exit_no_debugfs:
 634         return;
 635 }
 636 static inline void ab3100_remove_debugfs(void)
 637 {
 638         debugfs_remove(ab3100_set_reg_file);
 639         debugfs_remove(ab3100_get_reg_file);
 640         debugfs_remove(ab3100_reg_file);
 641         debugfs_remove(ab3100_dir);
 642 }
 643 #else
 644 static inline void ab3100_setup_debugfs(struct ab3100 *ab3100)
 645 {
 646 }
 647 static inline void ab3100_remove_debugfs(void)
 648 {
 649 }
 650 #endif
 651
 652 /*
 653  * Basic set-up, datastructure creation/destruction and I2C interface.
 654  * This sets up a default config in the AB3100 chip so that it
 655  * will work as expected.
 656  */
 657
 658 struct ab3100_init_setting {
 659         u8 abreg;
 660         u8 setting;
 661 };
 662
 663 static const struct ab3100_init_setting __devinitconst
 664 ab3100_init_settings[] = {
 665         {
 666                 .abreg = AB3100_MCA,
 667                 .setting = 0x01
 668         }, {
 669                 .abreg = AB3100_MCB,
 670                 .setting = 0x30
 671         }, {
 672                 .abreg = AB3100_IMRA1,
 673                 .setting = 0x00
 674         }, {
 675                 .abreg = AB3100_IMRA2,
 676                 .setting = 0xFF
 677         }, {
 678                 .abreg = AB3100_IMRA3,
 679                 .setting = 0x01
 680         }, {
 681                 .abreg = AB3100_IMRB1,
 682                 .setting = 0xBF
 683         }, {
 684                 .abreg = AB3100_IMRB2,
 685                 .setting = 0xFF
 686         }, {
 687                 .abreg = AB3100_IMRB3,
 688                 .setting = 0xFF
 689         }, {
 690                 .abreg = AB3100_SUP,
 691                 .setting = 0x00
 692         }, {
 693                 .abreg = AB3100_DIS,
 694                 .setting = 0xF0
 695         }, {
 696                 .abreg = AB3100_D0C,
 697                 .setting = 0x00
 698         }, {
 699                 .abreg = AB3100_D1C,
 700                 .setting = 0x00
 701         }, {
 702                 .abreg = AB3100_D2C,
 703                 .setting = 0x00
 704         }, {
 705                 .abreg = AB3100_D3C,
 706                 .setting = 0x00
 707         },
 708 };
 709
 710 static int __devinit ab3100_setup(struct ab3100 *ab3100)
 711 {
 712         int err = 0;
 713         int i;
 714
 715         for (i = 0; i < ARRAY_SIZE(ab3100_init_settings); i++) {
 716                 err = ab3100_set_register_interruptible(ab3100,
 717                                           ab3100_init_settings[i].abreg,
 718                                           ab3100_init_settings[i].setting);
 719                 if (err)
 720                         goto exit_no_setup;
 721         }
 722
 723         /*
 724          * Special trick to make the AB3100 use the 32kHz clock (RTC)
 725          * bit 3 in test register 0x02 is a special, undocumented test
 726          * register bit that only exist in AB3100 P1E
 727          */
 728         if (ab3100->chip_id == 0xc4) {
 729                 dev_warn(ab3100->dev,
 730                          "AB3100 P1E variant detected, "
 731                          "forcing chip to 32KHz\n");
 732                 err = ab3100_set_test_register_interruptible(ab3100,
 733                         0x02, 0x08);
 734         }
 735
 736  exit_no_setup:
 737         return err;
 738 }
 739
 740 /* The subdevices of the AB3100 */
 741 static struct mfd_cell ab3100_devs[] = {
 742         {
 743                 .name = "ab3100-dac",
 744                 .id = -1,
 745         },
 746         {
 747                 .name = "ab3100-leds",
 748                 .id = -1,
 749         },
 750         {
 751                 .name = "ab3100-power",
 752                 .id = -1,
 753         },
 754         {
 755                 .name = "ab3100-regulators",
 756                 .id = -1,
 757         },
 758         {
 759                 .name = "ab3100-sim",
 760                 .id = -1,
 761         },
 762         {
 763                 .name = "ab3100-uart",
 764                 .id = -1,
 765         },
 766         {
 767                 .name = "ab3100-rtc",
 768                 .id = -1,
 769         },
 770         {
 771                 .name = "ab3100-charger",
 772                 .id = -1,
 773         },
 774         {
 775                 .name = "ab3100-boost",
 776                 .id = -1,
 777         },
 778         {
 779                 .name = "ab3100-adc",
 780                 .id = -1,
 781         },
 782         {
 783                 .name = "ab3100-fuelgauge",
 784                 .id = -1,
 785         },
 786         {
 787                 .name = "ab3100-vibrator",
 788                 .id = -1,
 789         },
 790         {
 791                 .name = "ab3100-otp",
 792                 .id = -1,
 793         },
 794         {
 795                 .name = "ab3100-codec",
 796                 .id = -1,
 797         },
 798 };
 799
 800 struct ab_family_id {
 801         u8      id;
 802         char    *name;
 803 };
 804
 805 static const struct ab_family_id ids[] __devinitconst = {
 806         /* AB3100 */
 807         {
 808                 .id = 0xc0,
 809                 .name = "P1A"
 810         }, {
 811                 .id = 0xc1,
 812                 .name = "P1B"
 813         }, {
 814                 .id = 0xc2,
 815                 .name = "P1C"
 816         }, {
 817                 .id = 0xc3,
 818                 .name = "P1D"
 819         }, {
 820                 .id = 0xc4,
 821                 .name = "P1E"
 822         }, {
 823                 .id = 0xc5,
 824                 .name = "P1F/R1A"
 825         }, {
 826                 .id = 0xc6,
 827                 .name = "P1G/R1A"
 828         }, {
 829                 .id = 0xc7,
 830                 .name = "P2A/R2A"
 831         }, {
 832                 .id = 0xc8,
 833                 .name = "P2B/R2B"
 834         },
 835         /* AB3000 variants, not supported */
 836         {
 837                 .id = 0xa0
 838         }, {
 839                 .id = 0xa1
 840         }, {
 841                 .id = 0xa2
 842         }, {
 843                 .id = 0xa3
 844         }, {
 845                 .id = 0xa4
 846         }, {
 847                 .id = 0xa5
 848         }, {
 849                 .id = 0xa6
 850         }, {
 851                 .id = 0xa7
 852         },
 853         /* Terminator */
 854         {
 855                 .id = 0x00,
 856         },
 857 };
 858
 859 static int __devinit ab3100_probe(struct i2c_client *client,
 860                                   const struct i2c_device_id *id)
 861 {
 862         struct ab3100 *ab3100;
 863         struct ab3100_platform_data *ab3100_plf_data =
 864                 client->dev.platform_data;
 865         int err;
 866         int i;
 867
 868         ab3100 = kzalloc(sizeof(struct ab3100), GFP_KERNEL);
 869         if (!ab3100) {
 870                 dev_err(&client->dev, "could not allocate AB3100 device\n");
 871                 return -ENOMEM;
 872         }
 873
 874         /* Initialize data structure */
 875         mutex_init(&ab3100->access_mutex);
 876         BLOCKING_INIT_NOTIFIER_HEAD(&ab3100->event_subscribers);
 877
 878         ab3100->i2c_client = client;
 879         ab3100->dev = &ab3100->i2c_client->dev;
 880
 881         i2c_set_clientdata(client, ab3100);
 882
 883         /* Read chip ID register */
 884         err = ab3100_get_register_interruptible(ab3100, AB3100_CID,
 885                                                 &ab3100->chip_id);
 886         if (err) {
 887                 dev_err(&client->dev,
 888                         "could not communicate with the AB3100 analog "
 889                         "baseband chip\n");
 890                 goto exit_no_detect;
 891         }
 892
 893         for (i = 0; ids[i].id != 0x0; i++) {
 894                 if (ids[i].id == ab3100->chip_id) {
 895                         if (ids[i].name != NULL) {
 896                                 snprintf(&ab3100->chip_name[0],
 897                                          sizeof(ab3100->chip_name) - 1,
 898                                          "AB3100 %s",
 899                                          ids[i].name);
 900                                 break;
 901                         } else {
 902                                 dev_err(&client->dev,
 903                                         "AB3000 is not supported\n");
 904                                 goto exit_no_detect;
 905                         }
 906                 }
 907         }
 908
 909         if (ids[i].id == 0x0) {
 910                 dev_err(&client->dev, "unknown analog baseband chip id: 0x%x\n",
 911                         ab3100->chip_id);
 912                 dev_err(&client->dev, "accepting it anyway. Please update "
 913                         "the driver.\n");
 914                 goto exit_no_detect;
 915         }
 916
 917         dev_info(&client->dev, "Detected chip: %s\n",
 918                  &ab3100->chip_name[0]);
 919
 920         /* Attach a second dummy i2c_client to the test register address */
 921         ab3100->testreg_client = i2c_new_dummy(client->adapter,
 922                                                      client->addr + 1);
 923         if (!ab3100->testreg_client) {
 924                 err = -ENOMEM;
 925                 goto exit_no_testreg_client;
 926         }
 927
 928         err = ab3100_setup(ab3100);
 929         if (err)
 930                 goto exit_no_setup;
 931
 932         err = request_threaded_irq(client->irq, NULL, ab3100_irq_handler,
 933                                 IRQF_ONESHOT, "ab3100-core", ab3100);
 934         if (err)
 935                 goto exit_no_irq;
 936
 937         err = abx500_register_ops(&client->dev, &ab3100_ops);
 938         if (err)
 939                 goto exit_no_ops;
 940
 941         /* Set up and register the platform devices. */
 942         for (i = 0; i < ARRAY_SIZE(ab3100_devs); i++) {
 943                 ab3100_devs[i].platform_data = ab3100_plf_data;
 944                 ab3100_devs[i].pdata_size = sizeof(struct ab3100_platform_data);
 945         }
 946
 947         err = mfd_add_devices(&client->dev, 0, ab3100_devs,
 948                 ARRAY_SIZE(ab3100_devs), NULL, 0);
 949
 950         ab3100_setup_debugfs(ab3100);
 951
 952         return 0;
 953
 954  exit_no_ops:
 955  exit_no_irq:
 956  exit_no_setup:
 957         i2c_unregister_device(ab3100->testreg_client);
 958  exit_no_testreg_client:
 959  exit_no_detect:
 960         kfree(ab3100);
 961         return err;
 962 }
 963
 964 static int __devexit ab3100_remove(struct i2c_client *client)
 965 {
 966         struct ab3100 *ab3100 = i2c_get_clientdata(client);
 967
 968         /* Unregister subdevices */
 969         mfd_remove_devices(&client->dev);
 970
 971         ab3100_remove_debugfs();
 972         i2c_unregister_device(ab3100->testreg_client);
 973
 974         /*
 975          * At this point, all subscribers should have unregistered
 976          * their notifiers so deactivate IRQ
 977          */
 978         free_irq(client->irq, ab3100);
 979         kfree(ab3100);
 980         return 0;
 981 }
 982
 983 static const struct i2c_device_id ab3100_id[] = {
 984         { "ab3100", 0 },
 985         { }
 986 };
 987 MODULE_DEVICE_TABLE(i2c, ab3100_id);
 988
 989 static struct i2c_driver ab3100_driver = {
 990         .driver = {
 991                 .name   = "ab3100",
 992                 .owner  = THIS_MODULE,
 993         },
 994         .id_table       = ab3100_id,
 995         .probe          = ab3100_probe,
 996         .remove         = __devexit_p(ab3100_remove),
 997 };
 998
 999 static int __init ab3100_i2c_init(void)
1000 {
1001         return i2c_add_driver(&ab3100_driver);
1002 }
1003
1004 static void __exit ab3100_i2c_exit(void)
1005 {
1006         i2c_del_driver(&ab3100_driver);
1007 }
1008
1009 subsys_initcall(ab3100_i2c_init);
1010 module_exit(ab3100_i2c_exit);
1011
1012 MODULE_AUTHOR("Linus Walleij <linus.walleij@stericsson.com>");
1013 MODULE_DESCRIPTION("AB3100 core driver");
1014 MODULE_LICENSE("GPL");