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 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_IWUSR, 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_IWUSR, 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 __devinitconst
 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 __devinit 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 /* The subdevices of the AB3100 */
 747 static struct mfd_cell ab3100_devs[] = {
 748         {
 749                 .name = "ab3100-dac",
 750                 .id = -1,
 751         },
 752         {
 753                 .name = "ab3100-leds",
 754                 .id = -1,
 755         },
 756         {
 757                 .name = "ab3100-power",
 758                 .id = -1,
 759         },
 760         {
 761                 .name = "ab3100-regulators",
 762                 .id = -1,
 763         },
 764         {
 765                 .name = "ab3100-sim",
 766                 .id = -1,
 767         },
 768         {
 769                 .name = "ab3100-uart",
 770                 .id = -1,
 771         },
 772         {
 773                 .name = "ab3100-rtc",
 774                 .id = -1,
 775         },
 776         {
 777                 .name = "ab3100-charger",
 778                 .id = -1,
 779         },
 780         {
 781                 .name = "ab3100-boost",
 782                 .id = -1,
 783         },
 784         {
 785                 .name = "ab3100-adc",
 786                 .id = -1,
 787         },
 788         {
 789                 .name = "ab3100-fuelgauge",
 790                 .id = -1,
 791         },
 792         {
 793                 .name = "ab3100-vibrator",
 794                 .id = -1,
 795         },
 796         {
 797                 .name = "ab3100-otp",
 798                 .id = -1,
 799         },
 800         {
 801                 .name = "ab3100-codec",
 802                 .id = -1,
 803         },
 804 };
 805
 806 struct ab_family_id {
 807         u8      id;
 808         char    *name;
 809 };
 810
 811 static const struct ab_family_id ids[] __devinitconst = {
 812         /* AB3100 */
 813         {
 814                 .id = 0xc0,
 815                 .name = "P1A"
 816         }, {
 817                 .id = 0xc1,
 818                 .name = "P1B"
 819         }, {
 820                 .id = 0xc2,
 821                 .name = "P1C"
 822         }, {
 823                 .id = 0xc3,
 824                 .name = "P1D"
 825         }, {
 826                 .id = 0xc4,
 827                 .name = "P1E"
 828         }, {
 829                 .id = 0xc5,
 830                 .name = "P1F/R1A"
 831         }, {
 832                 .id = 0xc6,
 833                 .name = "P1G/R1A"
 834         }, {
 835                 .id = 0xc7,
 836                 .name = "P2A/R2A"
 837         }, {
 838                 .id = 0xc8,
 839                 .name = "P2B/R2B"
 840         },
 841         /* AB3000 variants, not supported */
 842         {
 843                 .id = 0xa0
 844         }, {
 845                 .id = 0xa1
 846         }, {
 847                 .id = 0xa2
 848         }, {
 849                 .id = 0xa3
 850         }, {
 851                 .id = 0xa4
 852         }, {
 853                 .id = 0xa5
 854         }, {
 855                 .id = 0xa6
 856         }, {
 857                 .id = 0xa7
 858         },
 859         /* Terminator */
 860         {
 861                 .id = 0x00,
 862         },
 863 };
 864
 865 static int __devinit ab3100_probe(struct i2c_client *client,
 866                                   const struct i2c_device_id *id)
 867 {
 868         struct ab3100 *ab3100;
 869         struct ab3100_platform_data *ab3100_plf_data =
 870                 client->dev.platform_data;
 871         int err;
 872         int i;
 873
 874         ab3100 = kzalloc(sizeof(struct ab3100), GFP_KERNEL);
 875         if (!ab3100) {
 876                 dev_err(&client->dev, "could not allocate AB3100 device\n");
 877                 return -ENOMEM;
 878         }
 879
 880         /* Initialize data structure */
 881         mutex_init(&ab3100->access_mutex);
 882         BLOCKING_INIT_NOTIFIER_HEAD(&ab3100->event_subscribers);
 883
 884         ab3100->i2c_client = client;
 885         ab3100->dev = &ab3100->i2c_client->dev;
 886
 887         i2c_set_clientdata(client, ab3100);
 888
 889         /* Read chip ID register */
 890         err = ab3100_get_register_interruptible(ab3100, AB3100_CID,
 891                                                 &ab3100->chip_id);
 892         if (err) {
 893                 dev_err(&client->dev,
 894                         "could not communicate with the AB3100 analog "
 895                         "baseband chip\n");
 896                 goto exit_no_detect;
 897         }
 898
 899         for (i = 0; ids[i].id != 0x0; i++) {
 900                 if (ids[i].id == ab3100->chip_id) {
 901                         if (ids[i].name != NULL) {
 902                                 snprintf(&ab3100->chip_name[0],
 903                                          sizeof(ab3100->chip_name) - 1,
 904                                          "AB3100 %s",
 905                                          ids[i].name);
 906                                 break;
 907                         } else {
 908                                 dev_err(&client->dev,
 909                                         "AB3000 is not supported\n");
 910                                 goto exit_no_detect;
 911                         }
 912                 }
 913         }
 914
 915         if (ids[i].id == 0x0) {
 916                 dev_err(&client->dev, "unknown analog baseband chip id: 0x%x\n",
 917                         ab3100->chip_id);
 918                 dev_err(&client->dev, "accepting it anyway. Please update "
 919                         "the driver.\n");
 920                 goto exit_no_detect;
 921         }
 922
 923         dev_info(&client->dev, "Detected chip: %s\n",
 924                  &ab3100->chip_name[0]);
 925
 926         /* Attach a second dummy i2c_client to the test register address */
 927         ab3100->testreg_client = i2c_new_dummy(client->adapter,
 928                                                      client->addr + 1);
 929         if (!ab3100->testreg_client) {
 930                 err = -ENOMEM;
 931                 goto exit_no_testreg_client;
 932         }
 933
 934         err = ab3100_setup(ab3100);
 935         if (err)
 936                 goto exit_no_setup;
 937
 938         err = request_threaded_irq(client->irq, NULL, ab3100_irq_handler,
 939                                 IRQF_ONESHOT, "ab3100-core", ab3100);
 940         /* This real unpredictable IRQ is of course sampled for entropy */
 941         rand_initialize_irq(client->irq);
 942
 943         if (err)
 944                 goto exit_no_irq;
 945
 946         err = abx500_register_ops(&client->dev, &ab3100_ops);
 947         if (err)
 948                 goto exit_no_ops;
 949
 950         /* Set up and register the platform devices. */
 951         for (i = 0; i < ARRAY_SIZE(ab3100_devs); i++) {
 952                 ab3100_devs[i].platform_data = ab3100_plf_data;
 953                 ab3100_devs[i].pdata_size = sizeof(struct ab3100_platform_data);
 954         }
 955
 956         err = mfd_add_devices(&client->dev, 0, ab3100_devs,
 957                 ARRAY_SIZE(ab3100_devs), NULL, 0);
 958
 959         ab3100_setup_debugfs(ab3100);
 960
 961         return 0;
 962
 963  exit_no_ops:
 964  exit_no_irq:
 965  exit_no_setup:
 966         i2c_unregister_device(ab3100->testreg_client);
 967  exit_no_testreg_client:
 968  exit_no_detect:
 969         kfree(ab3100);
 970         return err;
 971 }
 972
 973 static int __devexit ab3100_remove(struct i2c_client *client)
 974 {
 975         struct ab3100 *ab3100 = i2c_get_clientdata(client);
 976
 977         /* Unregister subdevices */
 978         mfd_remove_devices(&client->dev);
 979
 980         ab3100_remove_debugfs();
 981         i2c_unregister_device(ab3100->testreg_client);
 982
 983         /*
 984          * At this point, all subscribers should have unregistered
 985          * their notifiers so deactivate IRQ
 986          */
 987         free_irq(client->irq, ab3100);
 988         kfree(ab3100);
 989         return 0;
 990 }
 991
 992 static const struct i2c_device_id ab3100_id[] = {
 993         { "ab3100", 0 },
 994         { }
 995 };
 996 MODULE_DEVICE_TABLE(i2c, ab3100_id);
 997
 998 static struct i2c_driver ab3100_driver = {
 999         .driver = {
1000                 .name   = "ab3100",
1001                 .owner  = THIS_MODULE,
1002         },
1003         .id_table       = ab3100_id,
1004         .probe          = ab3100_probe,
1005         .remove         = __devexit_p(ab3100_remove),
1006 };
1007
1008 static int __init ab3100_i2c_init(void)
1009 {
1010         return i2c_add_driver(&ab3100_driver);
1011 }
1012
1013 static void __exit ab3100_i2c_exit(void)
1014 {
1015         i2c_del_driver(&ab3100_driver);
1016 }
1017
1018 subsys_initcall(ab3100_i2c_init);
1019 module_exit(ab3100_i2c_exit);
1020
1021 MODULE_AUTHOR("Linus Walleij <linus.walleij@stericsson.com>");
1022 MODULE_DESCRIPTION("AB3100 core driver");
1023 MODULE_LICENSE("GPL");