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/platform_device.h>
  16 #include <linux/device.h>
  17 #include <linux/interrupt.h>
  18 #include <linux/random.h>
  19 #include <linux/debugfs.h>
  20 #include <linux/seq_file.h>
  21 #include <linux/uaccess.h>
  22 #include <linux/mfd/abx500.h>
  23
  24 /* These are the only registers inside AB3100 used in this main file */
  25
  26 /* Interrupt event registers */
  27 #define AB3100_EVENTA1          0x21
  28 #define AB3100_EVENTA2          0x22
  29 #define AB3100_EVENTA3          0x23
  30
  31 /* AB3100 DAC converter registers */
  32 #define AB3100_DIS              0x00
  33 #define AB3100_D0C              0x01
  34 #define AB3100_D1C              0x02
  35 #define AB3100_D2C              0x03
  36 #define AB3100_D3C              0x04
  37
  38 /* Chip ID register */
  39 #define AB3100_CID              0x20
  40
  41 /* AB3100 interrupt registers */
  42 #define AB3100_IMRA1            0x24
  43 #define AB3100_IMRA2            0x25
  44 #define AB3100_IMRA3            0x26
  45 #define AB3100_IMRB1            0x2B
  46 #define AB3100_IMRB2            0x2C
  47 #define AB3100_IMRB3            0x2D
  48
  49 /* System Power Monitoring and control registers */
  50 #define AB3100_MCA              0x2E
  51 #define AB3100_MCB              0x2F
  52
  53 /* SIM power up */
  54 #define AB3100_SUP              0x50
  55
  56 /*
  57  * I2C communication
  58  *
  59  * The AB3100 is usually assigned address 0x48 (7-bit)
  60  * The chip is defined in the platform i2c_board_data section.
  61  */
  62 static int ab3100_get_chip_id(struct device *dev)
  63 {
  64         struct ab3100 *ab3100 = dev_get_drvdata(dev->parent);
  65
  66         return (int)ab3100->chip_id;
  67 }
  68
  69 static int ab3100_set_register_interruptible(struct ab3100 *ab3100,
  70         u8 reg, u8 regval)
  71 {
  72         u8 regandval[2] = {reg, regval};
  73         int err;
  74
  75         err = mutex_lock_interruptible(&ab3100->access_mutex);
  76         if (err)
  77                 return err;
  78
  79         /*
  80          * A two-byte write message with the first byte containing the register
  81          * number and the second byte containing the value to be written
  82          * effectively sets a register in the AB3100.
  83          */
  84         err = i2c_master_send(ab3100->i2c_client, regandval, 2);
  85         if (err < 0) {
  86                 dev_err(ab3100->dev,
  87                         "write error (write register): %d\n",
  88                         err);
  89         } else if (err != 2) {
  90                 dev_err(ab3100->dev,
  91                         "write error (write register) "
  92                         "%d bytes transferred (expected 2)\n",
  93                         err);
  94                 err = -EIO;
  95         } else {
  96                 /* All is well */
  97                 err = 0;
  98         }
  99         mutex_unlock(&ab3100->access_mutex);
 100         return err;
 101 }
 102
 103 static int set_register_interruptible(struct device *dev,
 104         u8 bank, u8 reg, u8 value)
 105 {
 106         struct ab3100 *ab3100 = dev_get_drvdata(dev->parent);
 107
 108         return ab3100_set_register_interruptible(ab3100, reg, value);
 109 }
 110
 111 /*
 112  * The test registers exist at an I2C bus address up one
 113  * from the ordinary base. They are not supposed to be used
 114  * in production code, but sometimes you have to do that
 115  * anyway. It's currently only used from this file so declare
 116  * it static and do not export.
 117  */
 118 static int ab3100_set_test_register_interruptible(struct ab3100 *ab3100,
 119                                     u8 reg, u8 regval)
 120 {
 121         u8 regandval[2] = {reg, regval};
 122         int err;
 123
 124         err = mutex_lock_interruptible(&ab3100->access_mutex);
 125         if (err)
 126                 return err;
 127
 128         err = i2c_master_send(ab3100->testreg_client, regandval, 2);
 129         if (err < 0) {
 130                 dev_err(ab3100->dev,
 131                         "write error (write test register): %d\n",
 132                         err);
 133         } else if (err != 2) {
 134                 dev_err(ab3100->dev,
 135                         "write error (write test register) "
 136                         "%d bytes transferred (expected 2)\n",
 137                         err);
 138                 err = -EIO;
 139         } else {
 140                 /* All is well */
 141                 err = 0;
 142         }
 143         mutex_unlock(&ab3100->access_mutex);
 144
 145         return err;
 146 }
 147
 148 static int ab3100_get_register_interruptible(struct ab3100 *ab3100,
 149         u8 reg, u8 *regval)
 150 {
 151         int err;
 152
 153         err = mutex_lock_interruptible(&ab3100->access_mutex);
 154         if (err)
 155                 return err;
 156
 157         /*
 158          * AB3100 require an I2C "stop" command between each message, else
 159          * it will not work. The only way of achieveing this with the
 160          * message transport layer is to send the read and write messages
 161          * separately.
 162          */
 163         err = i2c_master_send(ab3100->i2c_client, &reg, 1);
 164         if (err < 0) {
 165                 dev_err(ab3100->dev,
 166                         "write error (send register address): %d\n",
 167                         err);
 168                 goto get_reg_out_unlock;
 169         } else if (err != 1) {
 170                 dev_err(ab3100->dev,
 171                         "write error (send register address) "
 172                         "%d bytes transferred (expected 1)\n",
 173                         err);
 174                 err = -EIO;
 175                 goto get_reg_out_unlock;
 176         } else {
 177                 /* All is well */
 178                 err = 0;
 179         }
 180
 181         err = i2c_master_recv(ab3100->i2c_client, regval, 1);
 182         if (err < 0) {
 183                 dev_err(ab3100->dev,
 184                         "write error (read register): %d\n",
 185                         err);
 186                 goto get_reg_out_unlock;
 187         } else if (err != 1) {
 188                 dev_err(ab3100->dev,
 189                         "write error (read register) "
 190                         "%d bytes transferred (expected 1)\n",
 191                         err);
 192                 err = -EIO;
 193                 goto get_reg_out_unlock;
 194         } else {
 195                 /* All is well */
 196                 err = 0;
 197         }
 198
 199  get_reg_out_unlock:
 200         mutex_unlock(&ab3100->access_mutex);
 201         return err;
 202 }
 203
 204 static int get_register_interruptible(struct device *dev, u8 bank, u8 reg,
 205         u8 *value)
 206 {
 207         struct ab3100 *ab3100 = dev_get_drvdata(dev->parent);
 208
 209         return ab3100_get_register_interruptible(ab3100, reg, value);
 210 }
 211
 212 static int ab3100_get_register_page_interruptible(struct ab3100 *ab3100,
 213                              u8 first_reg, u8 *regvals, u8 numregs)
 214 {
 215         int err;
 216
 217         if (ab3100->chip_id == 0xa0 ||
 218             ab3100->chip_id == 0xa1)
 219                 /* These don't support paged reads */
 220                 return -EIO;
 221
 222         err = mutex_lock_interruptible(&ab3100->access_mutex);
 223         if (err)
 224                 return err;
 225
 226         /*
 227          * Paged read also require an I2C "stop" command.
 228          */
 229         err = i2c_master_send(ab3100->i2c_client, &first_reg, 1);
 230         if (err < 0) {
 231                 dev_err(ab3100->dev,
 232                         "write error (send first register address): %d\n",
 233                         err);
 234                 goto get_reg_page_out_unlock;
 235         } else if (err != 1) {
 236                 dev_err(ab3100->dev,
 237                         "write error (send first register address) "
 238                         "%d bytes transferred (expected 1)\n",
 239                         err);
 240                 err = -EIO;
 241                 goto get_reg_page_out_unlock;
 242         }
 243
 244         err = i2c_master_recv(ab3100->i2c_client, regvals, numregs);
 245         if (err < 0) {
 246                 dev_err(ab3100->dev,
 247                         "write error (read register page): %d\n",
 248                         err);
 249                 goto get_reg_page_out_unlock;
 250         } else if (err != numregs) {
 251                 dev_err(ab3100->dev,
 252                         "write error (read register page) "
 253                         "%d bytes transferred (expected %d)\n",
 254                         err, numregs);
 255                 err = -EIO;
 256                 goto get_reg_page_out_unlock;
 257         }
 258
 259         /* All is well */
 260         err = 0;
 261
 262  get_reg_page_out_unlock:
 263         mutex_unlock(&ab3100->access_mutex);
 264         return err;
 265 }
 266
 267 static int get_register_page_interruptible(struct device *dev, u8 bank,
 268         u8 first_reg, u8 *regvals, u8 numregs)
 269 {
 270         struct ab3100 *ab3100 = dev_get_drvdata(dev->parent);
 271
 272         return ab3100_get_register_page_interruptible(ab3100,
 273                         first_reg, regvals, numregs);
 274 }
 275
 276 static int ab3100_mask_and_set_register_interruptible(struct ab3100 *ab3100,
 277                                  u8 reg, u8 andmask, u8 ormask)
 278 {
 279         u8 regandval[2] = {reg, 0};
 280         int err;
 281
 282         err = mutex_lock_interruptible(&ab3100->access_mutex);
 283         if (err)
 284                 return err;
 285
 286         /* First read out the target register */
 287         err = i2c_master_send(ab3100->i2c_client, &reg, 1);
 288         if (err < 0) {
 289                 dev_err(ab3100->dev,
 290                         "write error (maskset send address): %d\n",
 291                         err);
 292                 goto get_maskset_unlock;
 293         } else if (err != 1) {
 294                 dev_err(ab3100->dev,
 295                         "write error (maskset send address) "
 296                         "%d bytes transferred (expected 1)\n",
 297                         err);
 298                 err = -EIO;
 299                 goto get_maskset_unlock;
 300         }
 301
 302         err = i2c_master_recv(ab3100->i2c_client, &regandval[1], 1);
 303         if (err < 0) {
 304                 dev_err(ab3100->dev,
 305                         "write error (maskset read register): %d\n",
 306                         err);
 307                 goto get_maskset_unlock;
 308         } else if (err != 1) {
 309                 dev_err(ab3100->dev,
 310                         "write error (maskset read register) "
 311                         "%d bytes transferred (expected 1)\n",
 312                         err);
 313                 err = -EIO;
 314                 goto get_maskset_unlock;
 315         }
 316
 317         /* Modify the register */
 318         regandval[1] &= andmask;
 319         regandval[1] |= ormask;
 320
 321         /* Write the register */
 322         err = i2c_master_send(ab3100->i2c_client, regandval, 2);
 323         if (err < 0) {
 324                 dev_err(ab3100->dev,
 325                         "write error (write register): %d\n",
 326                         err);
 327                 goto get_maskset_unlock;
 328         } else if (err != 2) {
 329                 dev_err(ab3100->dev,
 330                         "write error (write register) "
 331                         "%d bytes transferred (expected 2)\n",
 332                         err);
 333                 err = -EIO;
 334                 goto get_maskset_unlock;
 335         }
 336
 337         /* All is well */
 338         err = 0;
 339
 340  get_maskset_unlock:
 341         mutex_unlock(&ab3100->access_mutex);
 342         return err;
 343 }
 344
 345 static int mask_and_set_register_interruptible(struct device *dev, u8 bank,
 346         u8 reg, u8 bitmask, u8 bitvalues)
 347 {
 348         struct ab3100 *ab3100 = dev_get_drvdata(dev->parent);
 349
 350         return ab3100_mask_and_set_register_interruptible(ab3100,
 351                         reg, bitmask, (bitmask & bitvalues));
 352 }
 353
 354 /*
 355  * Register a simple callback for handling any AB3100 events.
 356  */
 357 int ab3100_event_register(struct ab3100 *ab3100,
 358                           struct notifier_block *nb)
 359 {
 360         return blocking_notifier_chain_register(&ab3100->event_subscribers,
 361                                                nb);
 362 }
 363 EXPORT_SYMBOL(ab3100_event_register);
 364
 365 /*
 366  * Remove a previously registered callback.
 367  */
 368 int ab3100_event_unregister(struct ab3100 *ab3100,
 369                             struct notifier_block *nb)
 370 {
 371   return blocking_notifier_chain_unregister(&ab3100->event_subscribers,
 372                                             nb);
 373 }
 374 EXPORT_SYMBOL(ab3100_event_unregister);
 375
 376
 377 static int ab3100_event_registers_startup_state_get(struct device *dev,
 378                                              u8 *event)
 379 {
 380         struct ab3100 *ab3100 = dev_get_drvdata(dev->parent);
 381         if (!ab3100->startup_events_read)
 382                 return -EAGAIN; /* Try again later */
 383         memcpy(event, ab3100->startup_events, 3);
 384         return 0;
 385 }
 386
 387 static struct abx500_ops ab3100_ops = {
 388         .get_chip_id = ab3100_get_chip_id,
 389         .set_register = set_register_interruptible,
 390         .get_register = get_register_interruptible,
 391         .get_register_page = get_register_page_interruptible,
 392         .set_register_page = NULL,
 393         .mask_and_set_register = mask_and_set_register_interruptible,
 394         .event_registers_startup_state_get =
 395                 ab3100_event_registers_startup_state_get,
 396         .startup_irq_enabled = NULL,
 397 };
 398
 399 /*
 400  * This is a threaded interrupt handler so we can make some
 401  * I2C calls etc.
 402  */
 403 static irqreturn_t ab3100_irq_handler(int irq, void *data)
 404 {
 405         struct ab3100 *ab3100 = data;
 406         u8 event_regs[3];
 407         u32 fatevent;
 408         int err;
 409
 410         add_interrupt_randomness(irq);
 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 int ab3100_get_set_reg_open_file(struct inode *inode, struct file *file)
 485 {
 486         file->private_data = inode->i_private;
 487         return 0;
 488 }
 489
 490 static ssize_t ab3100_get_set_reg(struct file *file,
 491                                   const char __user *user_buf,
 492                                   size_t count, loff_t *ppos)
 493 {
 494         struct ab3100_get_set_reg_priv *priv = file->private_data;
 495         struct ab3100 *ab3100 = priv->ab3100;
 496         char buf[32];
 497         ssize_t buf_size;
 498         int regp;
 499         unsigned long user_reg;
 500         int err;
 501         int i = 0;
 502
 503         /* Get userspace string and assure termination */
 504         buf_size = min(count, (sizeof(buf)-1));
 505         if (copy_from_user(buf, user_buf, buf_size))
 506                 return -EFAULT;
 507         buf[buf_size] = 0;
 508
 509         /*
 510          * The idea is here to parse a string which is either
 511          * "0xnn" for reading a register, or "0xaa 0xbb" for
 512          * writing 0xbb to the register 0xaa. First move past
 513          * whitespace and then begin to parse the register.
 514          */
 515         while ((i < buf_size) && (buf[i] == ' '))
 516                 i++;
 517         regp = i;
 518
 519         /*
 520          * Advance pointer to end of string then terminate
 521          * the register string. This is needed to satisfy
 522          * the strict_strtoul() function.
 523          */
 524         while ((i < buf_size) && (buf[i] != ' '))
 525                 i++;
 526         buf[i] = '\0';
 527
 528         err = strict_strtoul(&buf[regp], 16, &user_reg);
 529         if (err)
 530                 return err;
 531         if (user_reg > 0xff)
 532                 return -EINVAL;
 533
 534         /* Either we read or we write a register here */
 535         if (!priv->mode) {
 536                 /* Reading */
 537                 u8 reg = (u8) user_reg;
 538                 u8 regvalue;
 539
 540                 ab3100_get_register_interruptible(ab3100, reg, &regvalue);
 541
 542                 dev_info(ab3100->dev,
 543                          "debug read AB3100 reg[0x%02x]: 0x%02x\n",
 544                          reg, regvalue);
 545         } else {
 546                 int valp;
 547                 unsigned long user_value;
 548                 u8 reg = (u8) user_reg;
 549                 u8 value;
 550                 u8 regvalue;
 551
 552                 /*
 553                  * Writing, we need some value to write to
 554                  * the register so keep parsing the string
 555                  * from userspace.
 556                  */
 557                 i++;
 558                 while ((i < buf_size) && (buf[i] == ' '))
 559                         i++;
 560                 valp = i;
 561                 while ((i < buf_size) && (buf[i] != ' '))
 562                         i++;
 563                 buf[i] = '\0';
 564
 565                 err = strict_strtoul(&buf[valp], 16, &user_value);
 566                 if (err)
 567                         return err;
 568                 if (user_reg > 0xff)
 569                         return -EINVAL;
 570
 571                 value = (u8) user_value;
 572                 ab3100_set_register_interruptible(ab3100, reg, value);
 573                 ab3100_get_register_interruptible(ab3100, reg, &regvalue);
 574
 575                 dev_info(ab3100->dev,
 576                          "debug write reg[0x%02x] with 0x%02x, "
 577                          "after readback: 0x%02x\n",
 578                          reg, value, regvalue);
 579         }
 580         return buf_size;
 581 }
 582
 583 static const struct file_operations ab3100_get_set_reg_fops = {
 584         .open = ab3100_get_set_reg_open_file,
 585         .write = ab3100_get_set_reg,
 586         .llseek = noop_llseek,
 587 };
 588
 589 static struct dentry *ab3100_dir;
 590 static struct dentry *ab3100_reg_file;
 591 static struct ab3100_get_set_reg_priv ab3100_get_priv;
 592 static struct dentry *ab3100_get_reg_file;
 593 static struct ab3100_get_set_reg_priv ab3100_set_priv;
 594 static struct dentry *ab3100_set_reg_file;
 595
 596 static void ab3100_setup_debugfs(struct ab3100 *ab3100)
 597 {
 598         int err;
 599
 600         ab3100_dir = debugfs_create_dir("ab3100", NULL);
 601         if (!ab3100_dir)
 602                 goto exit_no_debugfs;
 603
 604         ab3100_reg_file = debugfs_create_file("registers",
 605                                 S_IRUGO, ab3100_dir, ab3100,
 606                                 &ab3100_registers_fops);
 607         if (!ab3100_reg_file) {
 608                 err = -ENOMEM;
 609                 goto exit_destroy_dir;
 610         }
 611
 612         ab3100_get_priv.ab3100 = ab3100;
 613         ab3100_get_priv.mode = false;
 614         ab3100_get_reg_file = debugfs_create_file("get_reg",
 615                                 S_IWUGO, ab3100_dir, &ab3100_get_priv,
 616                                 &ab3100_get_set_reg_fops);
 617         if (!ab3100_get_reg_file) {
 618                 err = -ENOMEM;
 619                 goto exit_destroy_reg;
 620         }
 621
 622         ab3100_set_priv.ab3100 = ab3100;
 623         ab3100_set_priv.mode = true;
 624         ab3100_set_reg_file = debugfs_create_file("set_reg",
 625                                 S_IWUGO, ab3100_dir, &ab3100_set_priv,
 626                                 &ab3100_get_set_reg_fops);
 627         if (!ab3100_set_reg_file) {
 628                 err = -ENOMEM;
 629                 goto exit_destroy_get_reg;
 630         }
 631         return;
 632
 633  exit_destroy_get_reg:
 634         debugfs_remove(ab3100_get_reg_file);
 635  exit_destroy_reg:
 636         debugfs_remove(ab3100_reg_file);
 637  exit_destroy_dir:
 638         debugfs_remove(ab3100_dir);
 639  exit_no_debugfs:
 640         return;
 641 }
 642 static inline void ab3100_remove_debugfs(void)
 643 {
 644         debugfs_remove(ab3100_set_reg_file);
 645         debugfs_remove(ab3100_get_reg_file);
 646         debugfs_remove(ab3100_reg_file);
 647         debugfs_remove(ab3100_dir);
 648 }
 649 #else
 650 static inline void ab3100_setup_debugfs(struct ab3100 *ab3100)
 651 {
 652 }
 653 static inline void ab3100_remove_debugfs(void)
 654 {
 655 }
 656 #endif
 657
 658 /*
 659  * Basic set-up, datastructure creation/destruction and I2C interface.
 660  * This sets up a default config in the AB3100 chip so that it
 661  * will work as expected.
 662  */
 663
 664 struct ab3100_init_setting {
 665         u8 abreg;
 666         u8 setting;
 667 };
 668
 669 static const struct ab3100_init_setting __initconst
 670 ab3100_init_settings[] = {
 671         {
 672                 .abreg = AB3100_MCA,
 673                 .setting = 0x01
 674         }, {
 675                 .abreg = AB3100_MCB,
 676                 .setting = 0x30
 677         }, {
 678                 .abreg = AB3100_IMRA1,
 679                 .setting = 0x00
 680         }, {
 681                 .abreg = AB3100_IMRA2,
 682                 .setting = 0xFF
 683         }, {
 684                 .abreg = AB3100_IMRA3,
 685                 .setting = 0x01
 686         }, {
 687                 .abreg = AB3100_IMRB1,
 688                 .setting = 0xBF
 689         }, {
 690                 .abreg = AB3100_IMRB2,
 691                 .setting = 0xFF
 692         }, {
 693                 .abreg = AB3100_IMRB3,
 694                 .setting = 0xFF
 695         }, {
 696                 .abreg = AB3100_SUP,
 697                 .setting = 0x00
 698         }, {
 699                 .abreg = AB3100_DIS,
 700                 .setting = 0xF0
 701         }, {
 702                 .abreg = AB3100_D0C,
 703                 .setting = 0x00
 704         }, {
 705                 .abreg = AB3100_D1C,
 706                 .setting = 0x00
 707         }, {
 708                 .abreg = AB3100_D2C,
 709                 .setting = 0x00
 710         }, {
 711                 .abreg = AB3100_D3C,
 712                 .setting = 0x00
 713         },
 714 };
 715
 716 static int __init ab3100_setup(struct ab3100 *ab3100)
 717 {
 718         int err = 0;
 719         int i;
 720
 721         for (i = 0; i < ARRAY_SIZE(ab3100_init_settings); i++) {
 722                 err = ab3100_set_register_interruptible(ab3100,
 723                                           ab3100_init_settings[i].abreg,
 724                                           ab3100_init_settings[i].setting);
 725                 if (err)
 726                         goto exit_no_setup;
 727         }
 728
 729         /*
 730          * Special trick to make the AB3100 use the 32kHz clock (RTC)
 731          * bit 3 in test register 0x02 is a special, undocumented test
 732          * register bit that only exist in AB3100 P1E
 733          */
 734         if (ab3100->chip_id == 0xc4) {
 735                 dev_warn(ab3100->dev,
 736                          "AB3100 P1E variant detected, "
 737                          "forcing chip to 32KHz\n");
 738                 err = ab3100_set_test_register_interruptible(ab3100,
 739                         0x02, 0x08);
 740         }
 741
 742  exit_no_setup:
 743         return err;
 744 }
 745
 746 /*
 747  * Here we define all the platform devices that appear
 748  * as children of the AB3100. These are regular platform
 749  * devices with the IORESOURCE_IO .start and .end set
 750  * to correspond to the internal AB3100 register range
 751  * mapping to the corresponding subdevice.
 752  */
 753
 754 #define AB3100_DEVICE(devname, devid)                           \
 755 static struct platform_device ab3100_##devname##_device = {     \
 756         .name           = devid,                                \
 757         .id             = -1,                                   \
 758 }
 759
 760 /* This lists all the subdevices */
 761 AB3100_DEVICE(dac, "ab3100-dac");
 762 AB3100_DEVICE(leds, "ab3100-leds");
 763 AB3100_DEVICE(power, "ab3100-power");
 764 AB3100_DEVICE(regulators, "ab3100-regulators");
 765 AB3100_DEVICE(sim, "ab3100-sim");
 766 AB3100_DEVICE(uart, "ab3100-uart");
 767 AB3100_DEVICE(rtc, "ab3100-rtc");
 768 AB3100_DEVICE(charger, "ab3100-charger");
 769 AB3100_DEVICE(boost, "ab3100-boost");
 770 AB3100_DEVICE(adc, "ab3100-adc");
 771 AB3100_DEVICE(fuelgauge, "ab3100-fuelgauge");
 772 AB3100_DEVICE(vibrator, "ab3100-vibrator");
 773 AB3100_DEVICE(otp, "ab3100-otp");
 774 AB3100_DEVICE(codec, "ab3100-codec");
 775
 776 static struct platform_device *
 777 ab3100_platform_devs[] = {
 778         &ab3100_dac_device,
 779         &ab3100_leds_device,
 780         &ab3100_power_device,
 781         &ab3100_regulators_device,
 782         &ab3100_sim_device,
 783         &ab3100_uart_device,
 784         &ab3100_rtc_device,
 785         &ab3100_charger_device,
 786         &ab3100_boost_device,
 787         &ab3100_adc_device,
 788         &ab3100_fuelgauge_device,
 789         &ab3100_vibrator_device,
 790         &ab3100_otp_device,
 791         &ab3100_codec_device,
 792 };
 793
 794 struct ab_family_id {
 795         u8      id;
 796         char    *name;
 797 };
 798
 799 static const struct ab_family_id ids[] __initdata = {
 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 __init 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                 client->dev.platform_data;
 859         int err;
 860         int i;
 861
 862         ab3100 = kzalloc(sizeof(struct ab3100), GFP_KERNEL);
 863         if (!ab3100) {
 864                 dev_err(&client->dev, "could not allocate AB3100 device\n");
 865                 return -ENOMEM;
 866         }
 867
 868         /* Initialize data structure */
 869         mutex_init(&ab3100->access_mutex);
 870         BLOCKING_INIT_NOTIFIER_HEAD(&ab3100->event_subscribers);
 871
 872         ab3100->i2c_client = client;
 873         ab3100->dev = &ab3100->i2c_client->dev;
 874
 875         i2c_set_clientdata(client, ab3100);
 876
 877         /* Read chip ID register */
 878         err = ab3100_get_register_interruptible(ab3100, AB3100_CID,
 879                                                 &ab3100->chip_id);
 880         if (err) {
 881                 dev_err(&client->dev,
 882                         "could not communicate with the AB3100 analog "
 883                         "baseband chip\n");
 884                 goto exit_no_detect;
 885         }
 886
 887         for (i = 0; ids[i].id != 0x0; i++) {
 888                 if (ids[i].id == ab3100->chip_id) {
 889                         if (ids[i].name != NULL) {
 890                                 snprintf(&ab3100->chip_name[0],
 891                                          sizeof(ab3100->chip_name) - 1,
 892                                          "AB3100 %s",
 893                                          ids[i].name);
 894                                 break;
 895                         } else {
 896                                 dev_err(&client->dev,
 897                                         "AB3000 is not supported\n");
 898                                 goto exit_no_detect;
 899                         }
 900                 }
 901         }
 902
 903         if (ids[i].id == 0x0) {
 904                 dev_err(&client->dev, "unknown analog baseband chip id: 0x%x\n",
 905                         ab3100->chip_id);
 906                 dev_err(&client->dev, "accepting it anyway. Please update "
 907                         "the driver.\n");
 908                 goto exit_no_detect;
 909         }
 910
 911         dev_info(&client->dev, "Detected chip: %s\n",
 912                  &ab3100->chip_name[0]);
 913
 914         /* Attach a second dummy i2c_client to the test register address */
 915         ab3100->testreg_client = i2c_new_dummy(client->adapter,
 916                                                      client->addr + 1);
 917         if (!ab3100->testreg_client) {
 918                 err = -ENOMEM;
 919                 goto exit_no_testreg_client;
 920         }
 921
 922         err = ab3100_setup(ab3100);
 923         if (err)
 924                 goto exit_no_setup;
 925
 926         err = request_threaded_irq(client->irq, NULL, ab3100_irq_handler,
 927                                 IRQF_ONESHOT, "ab3100-core", ab3100);
 928         /* This real unpredictable IRQ is of course sampled for entropy */
 929         rand_initialize_irq(client->irq);
 930
 931         if (err)
 932                 goto exit_no_irq;
 933
 934         err = abx500_register_ops(&client->dev, &ab3100_ops);
 935         if (err)
 936                 goto exit_no_ops;
 937
 938         /* Set parent and a pointer back to the container in device data */
 939         for (i = 0; i < ARRAY_SIZE(ab3100_platform_devs); i++) {
 940                 ab3100_platform_devs[i]->dev.parent =
 941                         &client->dev;
 942                 ab3100_platform_devs[i]->dev.platform_data =
 943                         ab3100_plf_data;
 944                 platform_set_drvdata(ab3100_platform_devs[i], ab3100);
 945         }
 946
 947         /* Register the platform devices */
 948         platform_add_devices(ab3100_platform_devs,
 949                              ARRAY_SIZE(ab3100_platform_devs));
 950
 951         ab3100_setup_debugfs(ab3100);
 952
 953         return 0;
 954
 955  exit_no_ops:
 956  exit_no_irq:
 957  exit_no_setup:
 958         i2c_unregister_device(ab3100->testreg_client);
 959  exit_no_testreg_client:
 960  exit_no_detect:
 961         kfree(ab3100);
 962         return err;
 963 }
 964
 965 static int __exit ab3100_remove(struct i2c_client *client)
 966 {
 967         struct ab3100 *ab3100 = i2c_get_clientdata(client);
 968         int i;
 969
 970         /* Unregister subdevices */
 971         for (i = 0; i < ARRAY_SIZE(ab3100_platform_devs); i++)
 972                 platform_device_unregister(ab3100_platform_devs[i]);
 973
 974         ab3100_remove_debugfs();
 975         i2c_unregister_device(ab3100->testreg_client);
 976
 977         /*
 978          * At this point, all subscribers should have unregistered
 979          * their notifiers so deactivate IRQ
 980          */
 981         free_irq(client->irq, ab3100);
 982         kfree(ab3100);
 983         return 0;
 984 }
 985
 986 static const struct i2c_device_id ab3100_id[] = {
 987         { "ab3100", 0 },
 988         { }
 989 };
 990 MODULE_DEVICE_TABLE(i2c, ab3100_id);
 991
 992 static struct i2c_driver ab3100_driver = {
 993         .driver = {
 994                 .name   = "ab3100",
 995                 .owner  = THIS_MODULE,
 996         },
 997         .id_table       = ab3100_id,
 998         .probe          = ab3100_probe,
 999         .remove         = __exit_p(ab3100_remove),
1000 };
1001
1002 static int __init ab3100_i2c_init(void)
1003 {
1004         return i2c_add_driver(&ab3100_driver);
1005 }
1006
1007 static void __exit ab3100_i2c_exit(void)
1008 {
1009         i2c_del_driver(&ab3100_driver);
1010 }
1011
1012 subsys_initcall(ab3100_i2c_init);
1013 module_exit(ab3100_i2c_exit);
1014
1015 MODULE_AUTHOR("Linus Walleij <linus.walleij@stericsson.com>");
1016 MODULE_DESCRIPTION("AB3100 core driver");
1017 MODULE_LICENSE("GPL");