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/ab3100.h>
  25 #include <linux/mfd/abx500.h>
  26
  27 /* These are the only registers inside AB3100 used in this main file */
  28
  29 /* Interrupt event registers */
  30 #define AB3100_EVENTA1          0x21
  31 #define AB3100_EVENTA2          0x22
  32 #define AB3100_EVENTA3          0x23
  33
  34 /* AB3100 DAC converter registers */
  35 #define AB3100_DIS              0x00
  36 #define AB3100_D0C              0x01
  37 #define AB3100_D1C              0x02
  38 #define AB3100_D2C              0x03
  39 #define AB3100_D3C              0x04
  40
  41 /* Chip ID register */
  42 #define AB3100_CID              0x20
  43
  44 /* AB3100 interrupt registers */
  45 #define AB3100_IMRA1            0x24
  46 #define AB3100_IMRA2            0x25
  47 #define AB3100_IMRA3            0x26
  48 #define AB3100_IMRB1            0x2B
  49 #define AB3100_IMRB2            0x2C
  50 #define AB3100_IMRB3            0x2D
  51
  52 /* System Power Monitoring and control registers */
  53 #define AB3100_MCA              0x2E
  54 #define AB3100_MCB              0x2F
  55
  56 /* SIM power up */
  57 #define AB3100_SUP              0x50
  58
  59 /*
  60  * I2C communication
  61  *
  62  * The AB3100 is usually assigned address 0x48 (7-bit)
  63  * The chip is defined in the platform i2c_board_data section.
  64  */
  65 static int ab3100_get_chip_id(struct device *dev)
  66 {
  67         struct ab3100 *ab3100 = dev_get_drvdata(dev->parent);
  68
  69         return (int)ab3100->chip_id;
  70 }
  71
  72 static int ab3100_set_register_interruptible(struct ab3100 *ab3100,
  73         u8 reg, u8 regval)
  74 {
  75         u8 regandval[2] = {reg, regval};
  76         int err;
  77
  78         err = mutex_lock_interruptible(&ab3100->access_mutex);
  79         if (err)
  80                 return err;
  81
  82         /*
  83          * A two-byte write message with the first byte containing the register
  84          * number and the second byte containing the value to be written
  85          * effectively sets a register in the AB3100.
  86          */
  87         err = i2c_master_send(ab3100->i2c_client, regandval, 2);
  88         if (err < 0) {
  89                 dev_err(ab3100->dev,
  90                         "write error (write register): %d\n",
  91                         err);
  92         } else if (err != 2) {
  93                 dev_err(ab3100->dev,
  94                         "write error (write register)\n"
  95                         "  %d bytes transferred (expected 2)\n",
  96                         err);
  97                 err = -EIO;
  98         } else {
  99                 /* All is well */
 100                 err = 0;
 101         }
 102         mutex_unlock(&ab3100->access_mutex);
 103         return err;
 104 }
 105
 106 static int set_register_interruptible(struct device *dev,
 107         u8 bank, u8 reg, u8 value)
 108 {
 109         struct ab3100 *ab3100 = dev_get_drvdata(dev->parent);
 110
 111         return ab3100_set_register_interruptible(ab3100, reg, value);
 112 }
 113
 114 /*
 115  * The test registers exist at an I2C bus address up one
 116  * from the ordinary base. They are not supposed to be used
 117  * in production code, but sometimes you have to do that
 118  * anyway. It's currently only used from this file so declare
 119  * it static and do not export.
 120  */
 121 static int ab3100_set_test_register_interruptible(struct ab3100 *ab3100,
 122                                     u8 reg, u8 regval)
 123 {
 124         u8 regandval[2] = {reg, regval};
 125         int err;
 126
 127         err = mutex_lock_interruptible(&ab3100->access_mutex);
 128         if (err)
 129                 return err;
 130
 131         err = i2c_master_send(ab3100->testreg_client, regandval, 2);
 132         if (err < 0) {
 133                 dev_err(ab3100->dev,
 134                         "write error (write test register): %d\n",
 135                         err);
 136         } else if (err != 2) {
 137                 dev_err(ab3100->dev,
 138                         "write error (write test register)\n"
 139                         "  %d bytes transferred (expected 2)\n",
 140                         err);
 141                 err = -EIO;
 142         } else {
 143                 /* All is well */
 144                 err = 0;
 145         }
 146         mutex_unlock(&ab3100->access_mutex);
 147
 148         return err;
 149 }
 150
 151 static int ab3100_get_register_interruptible(struct ab3100 *ab3100,
 152                                              u8 reg, u8 *regval)
 153 {
 154         int err;
 155
 156         err = mutex_lock_interruptible(&ab3100->access_mutex);
 157         if (err)
 158                 return err;
 159
 160         /*
 161          * AB3100 require an I2C "stop" command between each message, else
 162          * it will not work. The only way of achieveing this with the
 163          * message transport layer is to send the read and write messages
 164          * separately.
 165          */
 166         err = i2c_master_send(ab3100->i2c_client, &reg, 1);
 167         if (err < 0) {
 168                 dev_err(ab3100->dev,
 169                         "write error (send register address): %d\n",
 170                         err);
 171                 goto get_reg_out_unlock;
 172         } else if (err != 1) {
 173                 dev_err(ab3100->dev,
 174                         "write error (send register address)\n"
 175                         "  %d bytes transferred (expected 1)\n",
 176                         err);
 177                 err = -EIO;
 178                 goto get_reg_out_unlock;
 179         } else {
 180                 /* All is well */
 181                 err = 0;
 182         }
 183
 184         err = i2c_master_recv(ab3100->i2c_client, regval, 1);
 185         if (err < 0) {
 186                 dev_err(ab3100->dev,
 187                         "write error (read register): %d\n",
 188                         err);
 189                 goto get_reg_out_unlock;
 190         } else if (err != 1) {
 191                 dev_err(ab3100->dev,
 192                         "write error (read register)\n"
 193                         "  %d bytes transferred (expected 1)\n",
 194                         err);
 195                 err = -EIO;
 196                 goto get_reg_out_unlock;
 197         } else {
 198                 /* All is well */
 199                 err = 0;
 200         }
 201
 202  get_reg_out_unlock:
 203         mutex_unlock(&ab3100->access_mutex);
 204         return err;
 205 }
 206
 207 static int get_register_interruptible(struct device *dev, u8 bank, u8 reg,
 208                                       u8 *value)
 209 {
 210         struct ab3100 *ab3100 = dev_get_drvdata(dev->parent);
 211
 212         return ab3100_get_register_interruptible(ab3100, reg, value);
 213 }
 214
 215 static int ab3100_get_register_page_interruptible(struct ab3100 *ab3100,
 216                              u8 first_reg, u8 *regvals, u8 numregs)
 217 {
 218         int err;
 219
 220         if (ab3100->chip_id == 0xa0 ||
 221             ab3100->chip_id == 0xa1)
 222                 /* These don't support paged reads */
 223                 return -EIO;
 224
 225         err = mutex_lock_interruptible(&ab3100->access_mutex);
 226         if (err)
 227                 return err;
 228
 229         /*
 230          * Paged read also require an I2C "stop" command.
 231          */
 232         err = i2c_master_send(ab3100->i2c_client, &first_reg, 1);
 233         if (err < 0) {
 234                 dev_err(ab3100->dev,
 235                         "write error (send first register address): %d\n",
 236                         err);
 237                 goto get_reg_page_out_unlock;
 238         } else if (err != 1) {
 239                 dev_err(ab3100->dev,
 240                         "write error (send first register address)\n"
 241                         "  %d bytes transferred (expected 1)\n",
 242                         err);
 243                 err = -EIO;
 244                 goto get_reg_page_out_unlock;
 245         }
 246
 247         err = i2c_master_recv(ab3100->i2c_client, regvals, numregs);
 248         if (err < 0) {
 249                 dev_err(ab3100->dev,
 250                         "write error (read register page): %d\n",
 251                         err);
 252                 goto get_reg_page_out_unlock;
 253         } else if (err != numregs) {
 254                 dev_err(ab3100->dev,
 255                         "write error (read register page)\n"
 256                         "  %d bytes transferred (expected %d)\n",
 257                         err, numregs);
 258                 err = -EIO;
 259                 goto get_reg_page_out_unlock;
 260         }
 261
 262         /* All is well */
 263         err = 0;
 264
 265  get_reg_page_out_unlock:
 266         mutex_unlock(&ab3100->access_mutex);
 267         return err;
 268 }
 269
 270 static int get_register_page_interruptible(struct device *dev, u8 bank,
 271         u8 first_reg, u8 *regvals, u8 numregs)
 272 {
 273         struct ab3100 *ab3100 = dev_get_drvdata(dev->parent);
 274
 275         return ab3100_get_register_page_interruptible(ab3100,
 276                         first_reg, regvals, numregs);
 277 }
 278
 279 static int ab3100_mask_and_set_register_interruptible(struct ab3100 *ab3100,
 280                                  u8 reg, u8 andmask, u8 ormask)
 281 {
 282         u8 regandval[2] = {reg, 0};
 283         int err;
 284
 285         err = mutex_lock_interruptible(&ab3100->access_mutex);
 286         if (err)
 287                 return err;
 288
 289         /* First read out the target register */
 290         err = i2c_master_send(ab3100->i2c_client, &reg, 1);
 291         if (err < 0) {
 292                 dev_err(ab3100->dev,
 293                         "write error (maskset send address): %d\n",
 294                         err);
 295                 goto get_maskset_unlock;
 296         } else if (err != 1) {
 297                 dev_err(ab3100->dev,
 298                         "write error (maskset send address)\n"
 299                         "  %d bytes transferred (expected 1)\n",
 300                         err);
 301                 err = -EIO;
 302                 goto get_maskset_unlock;
 303         }
 304
 305         err = i2c_master_recv(ab3100->i2c_client, &regandval[1], 1);
 306         if (err < 0) {
 307                 dev_err(ab3100->dev,
 308                         "write error (maskset read register): %d\n",
 309                         err);
 310                 goto get_maskset_unlock;
 311         } else if (err != 1) {
 312                 dev_err(ab3100->dev,
 313                         "write error (maskset read register)\n"
 314                         "  %d bytes transferred (expected 1)\n",
 315                         err);
 316                 err = -EIO;
 317                 goto get_maskset_unlock;
 318         }
 319
 320         /* Modify the register */
 321         regandval[1] &= andmask;
 322         regandval[1] |= ormask;
 323
 324         /* Write the register */
 325         err = i2c_master_send(ab3100->i2c_client, regandval, 2);
 326         if (err < 0) {
 327                 dev_err(ab3100->dev,
 328                         "write error (write register): %d\n",
 329                         err);
 330                 goto get_maskset_unlock;
 331         } else if (err != 2) {
 332                 dev_err(ab3100->dev,
 333                         "write error (write register)\n"
 334                         "  %d bytes transferred (expected 2)\n",
 335                         err);
 336                 err = -EIO;
 337                 goto get_maskset_unlock;
 338         }
 339
 340         /* All is well */
 341         err = 0;
 342
 343  get_maskset_unlock:
 344         mutex_unlock(&ab3100->access_mutex);
 345         return err;
 346 }
 347
 348 static int mask_and_set_register_interruptible(struct device *dev, u8 bank,
 349         u8 reg, u8 bitmask, u8 bitvalues)
 350 {
 351         struct ab3100 *ab3100 = dev_get_drvdata(dev->parent);
 352
 353         return ab3100_mask_and_set_register_interruptible(ab3100,
 354                         reg, bitmask, (bitmask & bitvalues));
 355 }
 356
 357 /*
 358  * Register a simple callback for handling any AB3100 events.
 359  */
 360 int ab3100_event_register(struct ab3100 *ab3100,
 361                           struct notifier_block *nb)
 362 {
 363         return blocking_notifier_chain_register(&ab3100->event_subscribers,
 364                                                nb);
 365 }
 366 EXPORT_SYMBOL(ab3100_event_register);
 367
 368 /*
 369  * Remove a previously registered callback.
 370  */
 371 int ab3100_event_unregister(struct ab3100 *ab3100,
 372                             struct notifier_block *nb)
 373 {
 374         return blocking_notifier_chain_unregister(&ab3100->event_subscribers,
 375                                             nb);
 376 }
 377 EXPORT_SYMBOL(ab3100_event_unregister);
 378
 379
 380 static int ab3100_event_registers_startup_state_get(struct device *dev,
 381                                              u8 *event)
 382 {
 383         struct ab3100 *ab3100 = dev_get_drvdata(dev->parent);
 384
 385         if (!ab3100->startup_events_read)
 386                 return -EAGAIN; /* Try again later */
 387         memcpy(event, ab3100->startup_events, 3);
 388
 389         return 0;
 390 }
 391
 392 static struct abx500_ops ab3100_ops = {
 393         .get_chip_id = ab3100_get_chip_id,
 394         .set_register = set_register_interruptible,
 395         .get_register = get_register_interruptible,
 396         .get_register_page = get_register_page_interruptible,
 397         .set_register_page = NULL,
 398         .mask_and_set_register = mask_and_set_register_interruptible,
 399         .event_registers_startup_state_get =
 400                 ab3100_event_registers_startup_state_get,
 401         .startup_irq_enabled = NULL,
 402 };
 403
 404 /*
 405  * This is a threaded interrupt handler so we can make some
 406  * I2C calls etc.
 407  */
 408 static irqreturn_t ab3100_irq_handler(int irq, void *data)
 409 {
 410         struct ab3100 *ab3100 = data;
 411         u8 event_regs[3];
 412         u32 fatevent;
 413         int err;
 414
 415         err = ab3100_get_register_page_interruptible(ab3100, AB3100_EVENTA1,
 416                                        event_regs, 3);
 417         if (err)
 418                 goto err_event;
 419
 420         fatevent = (event_regs[0] << 16) |
 421                 (event_regs[1] << 8) |
 422                 event_regs[2];
 423
 424         if (!ab3100->startup_events_read) {
 425                 ab3100->startup_events[0] = event_regs[0];
 426                 ab3100->startup_events[1] = event_regs[1];
 427                 ab3100->startup_events[2] = event_regs[2];
 428                 ab3100->startup_events_read = true;
 429         }
 430         /*
 431          * The notified parties will have to mask out the events
 432          * they're interested in and react to them. They will be
 433          * notified on all events, then they use the fatevent value
 434          * to determine if they're interested.
 435          */
 436         blocking_notifier_call_chain(&ab3100->event_subscribers,
 437                                      fatevent, NULL);
 438
 439         dev_dbg(ab3100->dev,
 440                 "IRQ Event: 0x%08x\n", fatevent);
 441
 442         return IRQ_HANDLED;
 443
 444  err_event:
 445         dev_dbg(ab3100->dev,
 446                 "error reading event status\n");
 447         return IRQ_HANDLED;
 448 }
 449
 450 #ifdef CONFIG_DEBUG_FS
 451 /*
 452  * Some debugfs entries only exposed if we're using debug
 453  */
 454 static int ab3100_registers_print(struct seq_file *s, void *p)
 455 {
 456         struct ab3100 *ab3100 = s->private;
 457         u8 value;
 458         u8 reg;
 459
 460         seq_puts(s, "AB3100 registers:\n");
 461
 462         for (reg = 0; reg < 0xff; reg++) {
 463                 ab3100_get_register_interruptible(ab3100, reg, &value);
 464                 seq_printf(s, "[0x%x]:  0x%x\n", reg, value);
 465         }
 466         return 0;
 467 }
 468
 469 static int ab3100_registers_open(struct inode *inode, struct file *file)
 470 {
 471         return single_open(file, ab3100_registers_print, inode->i_private);
 472 }
 473
 474 static const struct file_operations ab3100_registers_fops = {
 475         .open = ab3100_registers_open,
 476         .read = seq_read,
 477         .llseek = seq_lseek,
 478         .release = single_release,
 479         .owner = THIS_MODULE,
 480 };
 481
 482 struct ab3100_get_set_reg_priv {
 483         struct ab3100 *ab3100;
 484         bool mode;
 485 };
 486
 487 static ssize_t ab3100_get_set_reg(struct file *file,
 488                                   const char __user *user_buf,
 489                                   size_t count, loff_t *ppos)
 490 {
 491         struct ab3100_get_set_reg_priv *priv = file->private_data;
 492         struct ab3100 *ab3100 = priv->ab3100;
 493         char buf[32];
 494         ssize_t buf_size;
 495         int regp;
 496         u8 user_reg;
 497         int err;
 498         int i = 0;
 499
 500         /* Get userspace string and assure termination */
 501         buf_size = min(count, (sizeof(buf)-1));
 502         if (copy_from_user(buf, user_buf, buf_size))
 503                 return -EFAULT;
 504         buf[buf_size] = 0;
 505
 506         /*
 507          * The idea is here to parse a string which is either
 508          * "0xnn" for reading a register, or "0xaa 0xbb" for
 509          * writing 0xbb to the register 0xaa. First move past
 510          * whitespace and then begin to parse the register.
 511          */
 512         while ((i < buf_size) && (buf[i] == ' '))
 513                 i++;
 514         regp = i;
 515
 516         /*
 517          * Advance pointer to end of string then terminate
 518          * the register string. This is needed to satisfy
 519          * the kstrtou8() function.
 520          */
 521         while ((i < buf_size) && (buf[i] != ' '))
 522                 i++;
 523         buf[i] = '\0';
 524
 525         err = kstrtou8(&buf[regp], 16, &user_reg);
 526         if (err)
 527                 return err;
 528
 529         /* Either we read or we write a register here */
 530         if (!priv->mode) {
 531                 /* Reading */
 532                 u8 regvalue;
 533
 534                 ab3100_get_register_interruptible(ab3100, user_reg, &regvalue);
 535
 536                 dev_info(ab3100->dev,
 537                          "debug read AB3100 reg[0x%02x]: 0x%02x\n",
 538                          user_reg, regvalue);
 539         } else {
 540                 int valp;
 541                 u8 user_value;
 542                 u8 regvalue;
 543
 544                 /*
 545                  * Writing, we need some value to write to
 546                  * the register so keep parsing the string
 547                  * from userspace.
 548                  */
 549                 i++;
 550                 while ((i < buf_size) && (buf[i] == ' '))
 551                         i++;
 552                 valp = i;
 553                 while ((i < buf_size) && (buf[i] != ' '))
 554                         i++;
 555                 buf[i] = '\0';
 556
 557                 err = kstrtou8(&buf[valp], 16, &user_value);
 558                 if (err)
 559                         return err;
 560
 561                 ab3100_set_register_interruptible(ab3100, user_reg, user_value);
 562                 ab3100_get_register_interruptible(ab3100, user_reg, &regvalue);
 563
 564                 dev_info(ab3100->dev,
 565                          "debug write reg[0x%02x]\n"
 566                          "  with 0x%02x, after readback: 0x%02x\n",
 567                          user_reg, user_value, regvalue);
 568         }
 569         return buf_size;
 570 }
 571
 572 static const struct file_operations ab3100_get_set_reg_fops = {
 573         .open = simple_open,
 574         .write = ab3100_get_set_reg,
 575         .llseek = noop_llseek,
 576 };
 577
 578 static struct dentry *ab3100_dir;
 579 static struct dentry *ab3100_reg_file;
 580 static struct ab3100_get_set_reg_priv ab3100_get_priv;
 581 static struct dentry *ab3100_get_reg_file;
 582 static struct ab3100_get_set_reg_priv ab3100_set_priv;
 583 static struct dentry *ab3100_set_reg_file;
 584
 585 static void ab3100_setup_debugfs(struct ab3100 *ab3100)
 586 {
 587         int err;
 588
 589         ab3100_dir = debugfs_create_dir("ab3100", NULL);
 590         if (!ab3100_dir)
 591                 goto exit_no_debugfs;
 592
 593         ab3100_reg_file = debugfs_create_file("registers",
 594                                 S_IRUGO, ab3100_dir, ab3100,
 595                                 &ab3100_registers_fops);
 596         if (!ab3100_reg_file) {
 597                 err = -ENOMEM;
 598                 goto exit_destroy_dir;
 599         }
 600
 601         ab3100_get_priv.ab3100 = ab3100;
 602         ab3100_get_priv.mode = false;
 603         ab3100_get_reg_file = debugfs_create_file("get_reg",
 604                                 S_IWUSR, ab3100_dir, &ab3100_get_priv,
 605                                 &ab3100_get_set_reg_fops);
 606         if (!ab3100_get_reg_file) {
 607                 err = -ENOMEM;
 608                 goto exit_destroy_reg;
 609         }
 610
 611         ab3100_set_priv.ab3100 = ab3100;
 612         ab3100_set_priv.mode = true;
 613         ab3100_set_reg_file = debugfs_create_file("set_reg",
 614                                 S_IWUSR, ab3100_dir, &ab3100_set_priv,
 615                                 &ab3100_get_set_reg_fops);
 616         if (!ab3100_set_reg_file) {
 617                 err = -ENOMEM;
 618                 goto exit_destroy_get_reg;
 619         }
 620         return;
 621
 622  exit_destroy_get_reg:
 623         debugfs_remove(ab3100_get_reg_file);
 624  exit_destroy_reg:
 625         debugfs_remove(ab3100_reg_file);
 626  exit_destroy_dir:
 627         debugfs_remove(ab3100_dir);
 628  exit_no_debugfs:
 629         return;
 630 }
 631 static inline void ab3100_remove_debugfs(void)
 632 {
 633         debugfs_remove(ab3100_set_reg_file);
 634         debugfs_remove(ab3100_get_reg_file);
 635         debugfs_remove(ab3100_reg_file);
 636         debugfs_remove(ab3100_dir);
 637 }
 638 #else
 639 static inline void ab3100_setup_debugfs(struct ab3100 *ab3100)
 640 {
 641 }
 642 static inline void ab3100_remove_debugfs(void)
 643 {
 644 }
 645 #endif
 646
 647 /*
 648  * Basic set-up, datastructure creation/destruction and I2C interface.
 649  * This sets up a default config in the AB3100 chip so that it
 650  * will work as expected.
 651  */
 652
 653 struct ab3100_init_setting {
 654         u8 abreg;
 655         u8 setting;
 656 };
 657
 658 static const struct ab3100_init_setting ab3100_init_settings[] = {
 659         {
 660                 .abreg = AB3100_MCA,
 661                 .setting = 0x01
 662         }, {
 663                 .abreg = AB3100_MCB,
 664                 .setting = 0x30
 665         }, {
 666                 .abreg = AB3100_IMRA1,
 667                 .setting = 0x00
 668         }, {
 669                 .abreg = AB3100_IMRA2,
 670                 .setting = 0xFF
 671         }, {
 672                 .abreg = AB3100_IMRA3,
 673                 .setting = 0x01
 674         }, {
 675                 .abreg = AB3100_IMRB1,
 676                 .setting = 0xBF
 677         }, {
 678                 .abreg = AB3100_IMRB2,
 679                 .setting = 0xFF
 680         }, {
 681                 .abreg = AB3100_IMRB3,
 682                 .setting = 0xFF
 683         }, {
 684                 .abreg = AB3100_SUP,
 685                 .setting = 0x00
 686         }, {
 687                 .abreg = AB3100_DIS,
 688                 .setting = 0xF0
 689         }, {
 690                 .abreg = AB3100_D0C,
 691                 .setting = 0x00
 692         }, {
 693                 .abreg = AB3100_D1C,
 694                 .setting = 0x00
 695         }, {
 696                 .abreg = AB3100_D2C,
 697                 .setting = 0x00
 698         }, {
 699                 .abreg = AB3100_D3C,
 700                 .setting = 0x00
 701         },
 702 };
 703
 704 static int ab3100_setup(struct ab3100 *ab3100)
 705 {
 706         int err = 0;
 707         int i;
 708
 709         for (i = 0; i < ARRAY_SIZE(ab3100_init_settings); i++) {
 710                 err = ab3100_set_register_interruptible(ab3100,
 711                                           ab3100_init_settings[i].abreg,
 712                                           ab3100_init_settings[i].setting);
 713                 if (err)
 714                         goto exit_no_setup;
 715         }
 716
 717         /*
 718          * Special trick to make the AB3100 use the 32kHz clock (RTC)
 719          * bit 3 in test register 0x02 is a special, undocumented test
 720          * register bit that only exist in AB3100 P1E
 721          */
 722         if (ab3100->chip_id == 0xc4) {
 723                 dev_warn(ab3100->dev,
 724                          "AB3100 P1E variant detected forcing chip to 32KHz\n");
 725                 err = ab3100_set_test_register_interruptible(ab3100,
 726                         0x02, 0x08);
 727         }
 728
 729  exit_no_setup:
 730         return err;
 731 }
 732
 733 /* The subdevices of the AB3100 */
 734 static struct mfd_cell ab3100_devs[] = {
 735         {
 736                 .name = "ab3100-dac",
 737                 .id = -1,
 738         },
 739         {
 740                 .name = "ab3100-leds",
 741                 .id = -1,
 742         },
 743         {
 744                 .name = "ab3100-power",
 745                 .id = -1,
 746         },
 747         {
 748                 .name = "ab3100-regulators",
 749                 .of_compatible = "stericsson,ab3100-regulators",
 750                 .id = -1,
 751         },
 752         {
 753                 .name = "ab3100-sim",
 754                 .id = -1,
 755         },
 756         {
 757                 .name = "ab3100-uart",
 758                 .id = -1,
 759         },
 760         {
 761                 .name = "ab3100-rtc",
 762                 .id = -1,
 763         },
 764         {
 765                 .name = "ab3100-charger",
 766                 .id = -1,
 767         },
 768         {
 769                 .name = "ab3100-boost",
 770                 .id = -1,
 771         },
 772         {
 773                 .name = "ab3100-adc",
 774                 .id = -1,
 775         },
 776         {
 777                 .name = "ab3100-fuelgauge",
 778                 .id = -1,
 779         },
 780         {
 781                 .name = "ab3100-vibrator",
 782                 .id = -1,
 783         },
 784         {
 785                 .name = "ab3100-otp",
 786                 .id = -1,
 787         },
 788         {
 789                 .name = "ab3100-codec",
 790                 .id = -1,
 791         },
 792 };
 793
 794 struct ab_family_id {
 795         u8      id;
 796         char    *name;
 797 };
 798
 799 static const struct ab_family_id ids[] = {
 800         /* AB3100 */
 801         {
 802                 .id = 0xc0,
 803                 .name = "P1A"
 804         }, {
 805                 .id = 0xc1,
 806                 .name = "P1B"
 807         }, {
 808                 .id = 0xc2,
 809                 .name = "P1C"
 810         }, {
 811                 .id = 0xc3,
 812                 .name = "P1D"
 813         }, {
 814                 .id = 0xc4,
 815                 .name = "P1E"
 816         }, {
 817                 .id = 0xc5,
 818                 .name = "P1F/R1A"
 819         }, {
 820                 .id = 0xc6,
 821                 .name = "P1G/R1A"
 822         }, {
 823                 .id = 0xc7,
 824                 .name = "P2A/R2A"
 825         }, {
 826                 .id = 0xc8,
 827                 .name = "P2B/R2B"
 828         },
 829         /* AB3000 variants, not supported */
 830         {
 831                 .id = 0xa0
 832         }, {
 833                 .id = 0xa1
 834         }, {
 835                 .id = 0xa2
 836         }, {
 837                 .id = 0xa3
 838         }, {
 839                 .id = 0xa4
 840         }, {
 841                 .id = 0xa5
 842         }, {
 843                 .id = 0xa6
 844         }, {
 845                 .id = 0xa7
 846         },
 847         /* Terminator */
 848         {
 849                 .id = 0x00,
 850         },
 851 };
 852
 853 static int ab3100_probe(struct i2c_client *client,
 854                                   const struct i2c_device_id *id)
 855 {
 856         struct ab3100 *ab3100;
 857         struct ab3100_platform_data *ab3100_plf_data =
 858                 dev_get_platdata(&client->dev);
 859         int err;
 860         int i;
 861
 862         ab3100 = devm_kzalloc(&client->dev, sizeof(struct ab3100), GFP_KERNEL);
 863         if (!ab3100)
 864                 return -ENOMEM;
 865
 866         /* Initialize data structure */
 867         mutex_init(&ab3100->access_mutex);
 868         BLOCKING_INIT_NOTIFIER_HEAD(&ab3100->event_subscribers);
 869
 870         ab3100->i2c_client = client;
 871         ab3100->dev = &ab3100->i2c_client->dev;
 872
 873         i2c_set_clientdata(client, ab3100);
 874
 875         /* Read chip ID register */
 876         err = ab3100_get_register_interruptible(ab3100, AB3100_CID,
 877                                                 &ab3100->chip_id);
 878         if (err) {
 879                 dev_err(&client->dev,
 880                         "failed to communicate with AB3100 chip\n");
 881                 goto exit_no_detect;
 882         }
 883
 884         for (i = 0; ids[i].id != 0x0; i++) {
 885                 if (ids[i].id == ab3100->chip_id) {
 886                         if (ids[i].name)
 887                                 break;
 888
 889                         dev_err(&client->dev, "AB3000 is not supported\n");
 890                         goto exit_no_detect;
 891                 }
 892         }
 893
 894         snprintf(&ab3100->chip_name[0],
 895                  sizeof(ab3100->chip_name) - 1, "AB3100 %s", ids[i].name);
 896
 897         if (ids[i].id == 0x0) {
 898                 dev_err(&client->dev, "unknown analog baseband chip id: 0x%x\n",
 899                         ab3100->chip_id);
 900                 dev_err(&client->dev,
 901                         "accepting it anyway. Please update the driver.\n");
 902                 goto exit_no_detect;
 903         }
 904
 905         dev_info(&client->dev, "Detected chip: %s\n",
 906                  &ab3100->chip_name[0]);
 907
 908         /* Attach a second dummy i2c_client to the test register address */
 909         ab3100->testreg_client = i2c_new_dummy(client->adapter,
 910                                                client->addr + 1);
 911         if (!ab3100->testreg_client) {
 912                 err = -ENOMEM;
 913                 goto exit_no_testreg_client;
 914         }
 915
 916         err = ab3100_setup(ab3100);
 917         if (err)
 918                 goto exit_no_setup;
 919
 920         err = devm_request_threaded_irq(&client->dev,
 921                                         client->irq, NULL, ab3100_irq_handler,
 922                                         IRQF_ONESHOT, "ab3100-core", ab3100);
 923         if (err)
 924                 goto exit_no_irq;
 925
 926         err = abx500_register_ops(&client->dev, &ab3100_ops);
 927         if (err)
 928                 goto exit_no_ops;
 929
 930         /* Set up and register the platform devices. */
 931         for (i = 0; i < ARRAY_SIZE(ab3100_devs); i++) {
 932                 ab3100_devs[i].platform_data = ab3100_plf_data;
 933                 ab3100_devs[i].pdata_size = sizeof(struct ab3100_platform_data);
 934         }
 935
 936         err = mfd_add_devices(&client->dev, 0, ab3100_devs,
 937                               ARRAY_SIZE(ab3100_devs), NULL, 0, NULL);
 938
 939         ab3100_setup_debugfs(ab3100);
 940
 941         return 0;
 942
 943  exit_no_ops:
 944  exit_no_irq:
 945  exit_no_setup:
 946         i2c_unregister_device(ab3100->testreg_client);
 947  exit_no_testreg_client:
 948  exit_no_detect:
 949         return err;
 950 }
 951
 952 static int ab3100_remove(struct i2c_client *client)
 953 {
 954         struct ab3100 *ab3100 = i2c_get_clientdata(client);
 955
 956         /* Unregister subdevices */
 957         mfd_remove_devices(&client->dev);
 958         ab3100_remove_debugfs();
 959         i2c_unregister_device(ab3100->testreg_client);
 960         return 0;
 961 }
 962
 963 static const struct i2c_device_id ab3100_id[] = {
 964         { "ab3100", 0 },
 965         { }
 966 };
 967 MODULE_DEVICE_TABLE(i2c, ab3100_id);
 968
 969 static struct i2c_driver ab3100_driver = {
 970         .driver = {
 971                 .name   = "ab3100",
 972         },
 973         .id_table       = ab3100_id,
 974         .probe          = ab3100_probe,
 975         .remove         = ab3100_remove,
 976 };
 977
 978 static int __init ab3100_i2c_init(void)
 979 {
 980         return i2c_add_driver(&ab3100_driver);
 981 }
 982
 983 static void __exit ab3100_i2c_exit(void)
 984 {
 985         i2c_del_driver(&ab3100_driver);
 986 }
 987
 988 subsys_initcall(ab3100_i2c_init);
 989 module_exit(ab3100_i2c_exit);
 990
 991 MODULE_AUTHOR("Linus Walleij <linus.walleij@stericsson.com>");
 992 MODULE_DESCRIPTION("AB3100 core driver");
 993 MODULE_LICENSE("GPL");