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/core.h>
  23 #include <linux/mfd/abx500.h>
  24
  25 /* These are the only registers inside AB3100 used in this main file */
  26
  27 /* Interrupt event registers */
  28 #define AB3100_EVENTA1          0x21
  29 #define AB3100_EVENTA2          0x22
  30 #define AB3100_EVENTA3          0x23
  31
  32 /* AB3100 DAC converter registers */
  33 #define AB3100_DIS              0x00
  34 #define AB3100_D0C              0x01
  35 #define AB3100_D1C              0x02
  36 #define AB3100_D2C              0x03
  37 #define AB3100_D3C              0x04
  38
  39 /* Chip ID register */
  40 #define AB3100_CID              0x20
  41
  42 /* AB3100 interrupt registers */
  43 #define AB3100_IMRA1            0x24
  44 #define AB3100_IMRA2            0x25
  45 #define AB3100_IMRA3            0x26
  46 #define AB3100_IMRB1            0x2B
  47 #define AB3100_IMRB2            0x2C
  48 #define AB3100_IMRB3            0x2D
  49
  50 /* System Power Monitoring and control registers */
  51 #define AB3100_MCA              0x2E
  52 #define AB3100_MCB              0x2F
  53
  54 /* SIM power up */
  55 #define AB3100_SUP              0x50
  56
  57 /*
  58  * I2C communication
  59  *
  60  * The AB3100 is usually assigned address 0x48 (7-bit)
  61  * The chip is defined in the platform i2c_board_data section.
  62  */
  63 static int ab3100_get_chip_id(struct device *dev)
  64 {
  65         struct ab3100 *ab3100 = dev_get_drvdata(dev->parent);
  66
  67         return (int)ab3100->chip_id;
  68 }
  69
  70 static int ab3100_set_register_interruptible(struct ab3100 *ab3100,
  71         u8 reg, u8 regval)
  72 {
  73         u8 regandval[2] = {reg, regval};
  74         int err;
  75
  76         err = mutex_lock_interruptible(&ab3100->access_mutex);
  77         if (err)
  78                 return err;
  79
  80         /*
  81          * A two-byte write message with the first byte containing the register
  82          * number and the second byte containing the value to be written
  83          * effectively sets a register in the AB3100.
  84          */
  85         err = i2c_master_send(ab3100->i2c_client, regandval, 2);
  86         if (err < 0) {
  87                 dev_err(ab3100->dev,
  88                         "write error (write register): %d\n",
  89                         err);
  90         } else if (err != 2) {
  91                 dev_err(ab3100->dev,
  92                         "write error (write register) "
  93                         "%d bytes transferred (expected 2)\n",
  94                         err);
  95                 err = -EIO;
  96         } else {
  97                 /* All is well */
  98                 err = 0;
  99         }
 100         mutex_unlock(&ab3100->access_mutex);
 101         return err;
 102 }
 103
 104 static int set_register_interruptible(struct device *dev,
 105         u8 bank, u8 reg, u8 value)
 106 {
 107         struct ab3100 *ab3100 = dev_get_drvdata(dev->parent);
 108
 109         return ab3100_set_register_interruptible(ab3100, reg, value);
 110 }
 111
 112 /*
 113  * The test registers exist at an I2C bus address up one
 114  * from the ordinary base. They are not supposed to be used
 115  * in production code, but sometimes you have to do that
 116  * anyway. It's currently only used from this file so declare
 117  * it static and do not export.
 118  */
 119 static int ab3100_set_test_register_interruptible(struct ab3100 *ab3100,
 120                                     u8 reg, u8 regval)
 121 {
 122         u8 regandval[2] = {reg, regval};
 123         int err;
 124
 125         err = mutex_lock_interruptible(&ab3100->access_mutex);
 126         if (err)
 127                 return err;
 128
 129         err = i2c_master_send(ab3100->testreg_client, regandval, 2);
 130         if (err < 0) {
 131                 dev_err(ab3100->dev,
 132                         "write error (write test register): %d\n",
 133                         err);
 134         } else if (err != 2) {
 135                 dev_err(ab3100->dev,
 136                         "write error (write test register) "
 137                         "%d bytes transferred (expected 2)\n",
 138                         err);
 139                 err = -EIO;
 140         } else {
 141                 /* All is well */
 142                 err = 0;
 143         }
 144         mutex_unlock(&ab3100->access_mutex);
 145
 146         return err;
 147 }
 148
 149 static int ab3100_get_register_interruptible(struct ab3100 *ab3100,
 150                                              u8 reg, u8 *regval)
 151 {
 152         int err;
 153
 154         err = mutex_lock_interruptible(&ab3100->access_mutex);
 155         if (err)
 156                 return err;
 157
 158         /*
 159          * AB3100 require an I2C "stop" command between each message, else
 160          * it will not work. The only way of achieveing this with the
 161          * message transport layer is to send the read and write messages
 162          * separately.
 163          */
 164         err = i2c_master_send(ab3100->i2c_client, &reg, 1);
 165         if (err < 0) {
 166                 dev_err(ab3100->dev,
 167                         "write error (send register address): %d\n",
 168                         err);
 169                 goto get_reg_out_unlock;
 170         } else if (err != 1) {
 171                 dev_err(ab3100->dev,
 172                         "write error (send register address) "
 173                         "%d bytes transferred (expected 1)\n",
 174                         err);
 175                 err = -EIO;
 176                 goto get_reg_out_unlock;
 177         } else {
 178                 /* All is well */
 179                 err = 0;
 180         }
 181
 182         err = i2c_master_recv(ab3100->i2c_client, regval, 1);
 183         if (err < 0) {
 184                 dev_err(ab3100->dev,
 185                         "write error (read register): %d\n",
 186                         err);
 187                 goto get_reg_out_unlock;
 188         } else if (err != 1) {
 189                 dev_err(ab3100->dev,
 190                         "write error (read register) "
 191                         "%d bytes transferred (expected 1)\n",
 192                         err);
 193                 err = -EIO;
 194                 goto get_reg_out_unlock;
 195         } else {
 196                 /* All is well */
 197                 err = 0;
 198         }
 199
 200  get_reg_out_unlock:
 201         mutex_unlock(&ab3100->access_mutex);
 202         return err;
 203 }
 204
 205 static int get_register_interruptible(struct device *dev, u8 bank, u8 reg,
 206                                       u8 *value)
 207 {
 208         struct ab3100 *ab3100 = dev_get_drvdata(dev->parent);
 209
 210         return ab3100_get_register_interruptible(ab3100, reg, value);
 211 }
 212
 213 static int ab3100_get_register_page_interruptible(struct ab3100 *ab3100,
 214                              u8 first_reg, u8 *regvals, u8 numregs)
 215 {
 216         int err;
 217
 218         if (ab3100->chip_id == 0xa0 ||
 219             ab3100->chip_id == 0xa1)
 220                 /* These don't support paged reads */
 221                 return -EIO;
 222
 223         err = mutex_lock_interruptible(&ab3100->access_mutex);
 224         if (err)
 225                 return err;
 226
 227         /*
 228          * Paged read also require an I2C "stop" command.
 229          */
 230         err = i2c_master_send(ab3100->i2c_client, &first_reg, 1);
 231         if (err < 0) {
 232                 dev_err(ab3100->dev,
 233                         "write error (send first register address): %d\n",
 234                         err);
 235                 goto get_reg_page_out_unlock;
 236         } else if (err != 1) {
 237                 dev_err(ab3100->dev,
 238                         "write error (send first register address) "
 239                         "%d bytes transferred (expected 1)\n",
 240                         err);
 241                 err = -EIO;
 242                 goto get_reg_page_out_unlock;
 243         }
 244
 245         err = i2c_master_recv(ab3100->i2c_client, regvals, numregs);
 246         if (err < 0) {
 247                 dev_err(ab3100->dev,
 248                         "write error (read register page): %d\n",
 249                         err);
 250                 goto get_reg_page_out_unlock;
 251         } else if (err != numregs) {
 252                 dev_err(ab3100->dev,
 253                         "write error (read register page) "
 254                         "%d bytes transferred (expected %d)\n",
 255                         err, numregs);
 256                 err = -EIO;
 257                 goto get_reg_page_out_unlock;
 258         }
 259
 260         /* All is well */
 261         err = 0;
 262
 263  get_reg_page_out_unlock:
 264         mutex_unlock(&ab3100->access_mutex);
 265         return err;
 266 }
 267
 268 static int get_register_page_interruptible(struct device *dev, u8 bank,
 269         u8 first_reg, u8 *regvals, u8 numregs)
 270 {
 271         struct ab3100 *ab3100 = dev_get_drvdata(dev->parent);
 272
 273         return ab3100_get_register_page_interruptible(ab3100,
 274                         first_reg, regvals, numregs);
 275 }
 276
 277 static int ab3100_mask_and_set_register_interruptible(struct ab3100 *ab3100,
 278                                  u8 reg, u8 andmask, u8 ormask)
 279 {
 280         u8 regandval[2] = {reg, 0};
 281         int err;
 282
 283         err = mutex_lock_interruptible(&ab3100->access_mutex);
 284         if (err)
 285                 return err;
 286
 287         /* First read out the target register */
 288         err = i2c_master_send(ab3100->i2c_client, &reg, 1);
 289         if (err < 0) {
 290                 dev_err(ab3100->dev,
 291                         "write error (maskset send address): %d\n",
 292                         err);
 293                 goto get_maskset_unlock;
 294         } else if (err != 1) {
 295                 dev_err(ab3100->dev,
 296                         "write error (maskset send address) "
 297                         "%d bytes transferred (expected 1)\n",
 298                         err);
 299                 err = -EIO;
 300                 goto get_maskset_unlock;
 301         }
 302
 303         err = i2c_master_recv(ab3100->i2c_client, &regandval[1], 1);
 304         if (err < 0) {
 305                 dev_err(ab3100->dev,
 306                         "write error (maskset read register): %d\n",
 307                         err);
 308                 goto get_maskset_unlock;
 309         } else if (err != 1) {
 310                 dev_err(ab3100->dev,
 311                         "write error (maskset read register) "
 312                         "%d bytes transferred (expected 1)\n",
 313                         err);
 314                 err = -EIO;
 315                 goto get_maskset_unlock;
 316         }
 317
 318         /* Modify the register */
 319         regandval[1] &= andmask;
 320         regandval[1] |= ormask;
 321
 322         /* Write the register */
 323         err = i2c_master_send(ab3100->i2c_client, regandval, 2);
 324         if (err < 0) {
 325                 dev_err(ab3100->dev,
 326                         "write error (write register): %d\n",
 327                         err);
 328                 goto get_maskset_unlock;
 329         } else if (err != 2) {
 330                 dev_err(ab3100->dev,
 331                         "write error (write register) "
 332                         "%d bytes transferred (expected 2)\n",
 333                         err);
 334                 err = -EIO;
 335                 goto get_maskset_unlock;
 336         }
 337
 338         /* All is well */
 339         err = 0;
 340
 341  get_maskset_unlock:
 342         mutex_unlock(&ab3100->access_mutex);
 343         return err;
 344 }
 345
 346 static int mask_and_set_register_interruptible(struct device *dev, u8 bank,
 347         u8 reg, u8 bitmask, u8 bitvalues)
 348 {
 349         struct ab3100 *ab3100 = dev_get_drvdata(dev->parent);
 350
 351         return ab3100_mask_and_set_register_interruptible(ab3100,
 352                         reg, bitmask, (bitmask & bitvalues));
 353 }
 354
 355 /*
 356  * Register a simple callback for handling any AB3100 events.
 357  */
 358 int ab3100_event_register(struct ab3100 *ab3100,
 359                           struct notifier_block *nb)
 360 {
 361         return blocking_notifier_chain_register(&ab3100->event_subscribers,
 362                                                nb);
 363 }
 364 EXPORT_SYMBOL(ab3100_event_register);
 365
 366 /*
 367  * Remove a previously registered callback.
 368  */
 369 int ab3100_event_unregister(struct ab3100 *ab3100,
 370                             struct notifier_block *nb)
 371 {
 372   return blocking_notifier_chain_unregister(&ab3100->event_subscribers,
 373                                             nb);
 374 }
 375 EXPORT_SYMBOL(ab3100_event_unregister);
 376
 377
 378 static int ab3100_event_registers_startup_state_get(struct device *dev,
 379                                              u8 *event)
 380 {
 381         struct ab3100 *ab3100 = dev_get_drvdata(dev->parent);
 382         if (!ab3100->startup_events_read)
 383                 return -EAGAIN; /* Try again later */
 384         memcpy(event, ab3100->startup_events, 3);
 385         return 0;
 386 }
 387
 388 static struct abx500_ops ab3100_ops = {
 389         .get_chip_id = ab3100_get_chip_id,
 390         .set_register = set_register_interruptible,
 391         .get_register = get_register_interruptible,
 392         .get_register_page = get_register_page_interruptible,
 393         .set_register_page = NULL,
 394         .mask_and_set_register = mask_and_set_register_interruptible,
 395         .event_registers_startup_state_get =
 396                 ab3100_event_registers_startup_state_get,
 397         .startup_irq_enabled = NULL,
 398 };
 399
 400 /*
 401  * This is a threaded interrupt handler so we can make some
 402  * I2C calls etc.
 403  */
 404 static irqreturn_t ab3100_irq_handler(int irq, void *data)
 405 {
 406         struct ab3100 *ab3100 = data;
 407         u8 event_regs[3];
 408         u32 fatevent;
 409         int err;
 410
 411         add_interrupt_randomness(irq);
 412
 413         err = ab3100_get_register_page_interruptible(ab3100, AB3100_EVENTA1,
 414                                        event_regs, 3);
 415         if (err)
 416                 goto err_event;
 417
 418         fatevent = (event_regs[0] << 16) |
 419                 (event_regs[1] << 8) |
 420                 event_regs[2];
 421
 422         if (!ab3100->startup_events_read) {
 423                 ab3100->startup_events[0] = event_regs[0];
 424                 ab3100->startup_events[1] = event_regs[1];
 425                 ab3100->startup_events[2] = event_regs[2];
 426                 ab3100->startup_events_read = true;
 427         }
 428         /*
 429          * The notified parties will have to mask out the events
 430          * they're interested in and react to them. They will be
 431          * notified on all events, then they use the fatevent value
 432          * to determine if they're interested.
 433          */
 434         blocking_notifier_call_chain(&ab3100->event_subscribers,
 435                                      fatevent, NULL);
 436
 437         dev_dbg(ab3100->dev,
 438                 "IRQ Event: 0x%08x\n", fatevent);
 439
 440         return IRQ_HANDLED;
 441
 442  err_event:
 443         dev_dbg(ab3100->dev,
 444                 "error reading event status\n");
 445         return IRQ_HANDLED;
 446 }
 447
 448 #ifdef CONFIG_DEBUG_FS
 449 /*
 450  * Some debugfs entries only exposed if we're using debug
 451  */
 452 static int ab3100_registers_print(struct seq_file *s, void *p)
 453 {
 454         struct ab3100 *ab3100 = s->private;
 455         u8 value;
 456         u8 reg;
 457
 458         seq_printf(s, "AB3100 registers:\n");
 459
 460         for (reg = 0; reg < 0xff; reg++) {
 461                 ab3100_get_register_interruptible(ab3100, reg, &value);
 462                 seq_printf(s, "[0x%x]:  0x%x\n", reg, value);
 463         }
 464         return 0;
 465 }
 466
 467 static int ab3100_registers_open(struct inode *inode, struct file *file)
 468 {
 469         return single_open(file, ab3100_registers_print, inode->i_private);
 470 }
 471
 472 static const struct file_operations ab3100_registers_fops = {
 473         .open = ab3100_registers_open,
 474         .read = seq_read,
 475         .llseek = seq_lseek,
 476         .release = single_release,
 477         .owner = THIS_MODULE,
 478 };
 479
 480 struct ab3100_get_set_reg_priv {
 481         struct ab3100 *ab3100;
 482         bool mode;
 483 };
 484
 485 static int ab3100_get_set_reg_open_file(struct inode *inode, struct file *file)
 486 {
 487         file->private_data = inode->i_private;
 488         return 0;
 489 }
 490
 491 static ssize_t ab3100_get_set_reg(struct file *file,
 492                                   const char __user *user_buf,
 493                                   size_t count, loff_t *ppos)
 494 {
 495         struct ab3100_get_set_reg_priv *priv = file->private_data;
 496         struct ab3100 *ab3100 = priv->ab3100;
 497         char buf[32];
 498         ssize_t buf_size;
 499         int regp;
 500         unsigned long user_reg;
 501         int err;
 502         int i = 0;
 503
 504         /* Get userspace string and assure termination */
 505         buf_size = min(count, (sizeof(buf)-1));
 506         if (copy_from_user(buf, user_buf, buf_size))
 507                 return -EFAULT;
 508         buf[buf_size] = 0;
 509
 510         /*
 511          * The idea is here to parse a string which is either
 512          * "0xnn" for reading a register, or "0xaa 0xbb" for
 513          * writing 0xbb to the register 0xaa. First move past
 514          * whitespace and then begin to parse the register.
 515          */
 516         while ((i < buf_size) && (buf[i] == ' '))
 517                 i++;
 518         regp = i;
 519
 520         /*
 521          * Advance pointer to end of string then terminate
 522          * the register string. This is needed to satisfy
 523          * the strict_strtoul() function.
 524          */
 525         while ((i < buf_size) && (buf[i] != ' '))
 526                 i++;
 527         buf[i] = '\0';
 528
 529         err = strict_strtoul(&buf[regp], 16, &user_reg);
 530         if (err)
 531                 return err;
 532         if (user_reg > 0xff)
 533                 return -EINVAL;
 534
 535         /* Either we read or we write a register here */
 536         if (!priv->mode) {
 537                 /* Reading */
 538                 u8 reg = (u8) user_reg;
 539                 u8 regvalue;
 540
 541                 ab3100_get_register_interruptible(ab3100, reg, &regvalue);
 542
 543                 dev_info(ab3100->dev,
 544                          "debug read AB3100 reg[0x%02x]: 0x%02x\n",
 545                          reg, regvalue);
 546         } else {
 547                 int valp;
 548                 unsigned long user_value;
 549                 u8 reg = (u8) user_reg;
 550                 u8 value;
 551                 u8 regvalue;
 552
 553                 /*
 554                  * Writing, we need some value to write to
 555                  * the register so keep parsing the string
 556                  * from userspace.
 557                  */
 558                 i++;
 559                 while ((i < buf_size) && (buf[i] == ' '))
 560                         i++;
 561                 valp = i;
 562                 while ((i < buf_size) && (buf[i] != ' '))
 563                         i++;
 564                 buf[i] = '\0';
 565
 566                 err = strict_strtoul(&buf[valp], 16, &user_value);
 567                 if (err)
 568                         return err;
 569                 if (user_reg > 0xff)
 570                         return -EINVAL;
 571
 572                 value = (u8) user_value;
 573                 ab3100_set_register_interruptible(ab3100, reg, value);
 574                 ab3100_get_register_interruptible(ab3100, reg, &regvalue);
 575
 576                 dev_info(ab3100->dev,
 577                          "debug write reg[0x%02x] with 0x%02x, "
 578                          "after readback: 0x%02x\n",
 579                          reg, value, regvalue);
 580         }
 581         return buf_size;
 582 }
 583
 584 static const struct file_operations ab3100_get_set_reg_fops = {
 585         .open = ab3100_get_set_reg_open_file,
 586         .write = ab3100_get_set_reg,
 587         .llseek = noop_llseek,
 588 };
 589
 590 static struct dentry *ab3100_dir;
 591 static struct dentry *ab3100_reg_file;
 592 static struct ab3100_get_set_reg_priv ab3100_get_priv;
 593 static struct dentry *ab3100_get_reg_file;
 594 static struct ab3100_get_set_reg_priv ab3100_set_priv;
 595 static struct dentry *ab3100_set_reg_file;
 596
 597 static void ab3100_setup_debugfs(struct ab3100 *ab3100)
 598 {
 599         int err;
 600
 601         ab3100_dir = debugfs_create_dir("ab3100", NULL);
 602         if (!ab3100_dir)
 603                 goto exit_no_debugfs;
 604
 605         ab3100_reg_file = debugfs_create_file("registers",
 606                                 S_IRUGO, ab3100_dir, ab3100,
 607                                 &ab3100_registers_fops);
 608         if (!ab3100_reg_file) {
 609                 err = -ENOMEM;
 610                 goto exit_destroy_dir;
 611         }
 612
 613         ab3100_get_priv.ab3100 = ab3100;
 614         ab3100_get_priv.mode = false;
 615         ab3100_get_reg_file = debugfs_create_file("get_reg",
 616                                 S_IWUSR, ab3100_dir, &ab3100_get_priv,
 617                                 &ab3100_get_set_reg_fops);
 618         if (!ab3100_get_reg_file) {
 619                 err = -ENOMEM;
 620                 goto exit_destroy_reg;
 621         }
 622
 623         ab3100_set_priv.ab3100 = ab3100;
 624         ab3100_set_priv.mode = true;
 625         ab3100_set_reg_file = debugfs_create_file("set_reg",
 626                                 S_IWUSR, ab3100_dir, &ab3100_set_priv,
 627                                 &ab3100_get_set_reg_fops);
 628         if (!ab3100_set_reg_file) {
 629                 err = -ENOMEM;
 630                 goto exit_destroy_get_reg;
 631         }
 632         return;
 633
 634  exit_destroy_get_reg:
 635         debugfs_remove(ab3100_get_reg_file);
 636  exit_destroy_reg:
 637         debugfs_remove(ab3100_reg_file);
 638  exit_destroy_dir:
 639         debugfs_remove(ab3100_dir);
 640  exit_no_debugfs:
 641         return;
 642 }
 643 static inline void ab3100_remove_debugfs(void)
 644 {
 645         debugfs_remove(ab3100_set_reg_file);
 646         debugfs_remove(ab3100_get_reg_file);
 647         debugfs_remove(ab3100_reg_file);
 648         debugfs_remove(ab3100_dir);
 649 }
 650 #else
 651 static inline void ab3100_setup_debugfs(struct ab3100 *ab3100)
 652 {
 653 }
 654 static inline void ab3100_remove_debugfs(void)
 655 {
 656 }
 657 #endif
 658
 659 /*
 660  * Basic set-up, datastructure creation/destruction and I2C interface.
 661  * This sets up a default config in the AB3100 chip so that it
 662  * will work as expected.
 663  */
 664
 665 struct ab3100_init_setting {
 666         u8 abreg;
 667         u8 setting;
 668 };
 669
 670 static const struct ab3100_init_setting __devinitconst
 671 ab3100_init_settings[] = {
 672         {
 673                 .abreg = AB3100_MCA,
 674                 .setting = 0x01
 675         }, {
 676                 .abreg = AB3100_MCB,
 677                 .setting = 0x30
 678         }, {
 679                 .abreg = AB3100_IMRA1,
 680                 .setting = 0x00
 681         }, {
 682                 .abreg = AB3100_IMRA2,
 683                 .setting = 0xFF
 684         }, {
 685                 .abreg = AB3100_IMRA3,
 686                 .setting = 0x01
 687         }, {
 688                 .abreg = AB3100_IMRB1,
 689                 .setting = 0xBF
 690         }, {
 691                 .abreg = AB3100_IMRB2,
 692                 .setting = 0xFF
 693         }, {
 694                 .abreg = AB3100_IMRB3,
 695                 .setting = 0xFF
 696         }, {
 697                 .abreg = AB3100_SUP,
 698                 .setting = 0x00
 699         }, {
 700                 .abreg = AB3100_DIS,
 701                 .setting = 0xF0
 702         }, {
 703                 .abreg = AB3100_D0C,
 704                 .setting = 0x00
 705         }, {
 706                 .abreg = AB3100_D1C,
 707                 .setting = 0x00
 708         }, {
 709                 .abreg = AB3100_D2C,
 710                 .setting = 0x00
 711         }, {
 712                 .abreg = AB3100_D3C,
 713                 .setting = 0x00
 714         },
 715 };
 716
 717 static int __devinit ab3100_setup(struct ab3100 *ab3100)
 718 {
 719         int err = 0;
 720         int i;
 721
 722         for (i = 0; i < ARRAY_SIZE(ab3100_init_settings); i++) {
 723                 err = ab3100_set_register_interruptible(ab3100,
 724                                           ab3100_init_settings[i].abreg,
 725                                           ab3100_init_settings[i].setting);
 726                 if (err)
 727                         goto exit_no_setup;
 728         }
 729
 730         /*
 731          * Special trick to make the AB3100 use the 32kHz clock (RTC)
 732          * bit 3 in test register 0x02 is a special, undocumented test
 733          * register bit that only exist in AB3100 P1E
 734          */
 735         if (ab3100->chip_id == 0xc4) {
 736                 dev_warn(ab3100->dev,
 737                          "AB3100 P1E variant detected, "
 738                          "forcing chip to 32KHz\n");
 739                 err = ab3100_set_test_register_interruptible(ab3100,
 740                         0x02, 0x08);
 741         }
 742
 743  exit_no_setup:
 744         return err;
 745 }
 746
 747 /* The subdevices of the AB3100 */
 748 static struct mfd_cell ab3100_devs[] = {
 749         {
 750                 .name = "ab3100-dac",
 751                 .id = -1,
 752         },
 753         {
 754                 .name = "ab3100-leds",
 755                 .id = -1,
 756         },
 757         {
 758                 .name = "ab3100-power",
 759                 .id = -1,
 760         },
 761         {
 762                 .name = "ab3100-regulators",
 763                 .id = -1,
 764         },
 765         {
 766                 .name = "ab3100-sim",
 767                 .id = -1,
 768         },
 769         {
 770                 .name = "ab3100-uart",
 771                 .id = -1,
 772         },
 773         {
 774                 .name = "ab3100-rtc",
 775                 .id = -1,
 776         },
 777         {
 778                 .name = "ab3100-charger",
 779                 .id = -1,
 780         },
 781         {
 782                 .name = "ab3100-boost",
 783                 .id = -1,
 784         },
 785         {
 786                 .name = "ab3100-adc",
 787                 .id = -1,
 788         },
 789         {
 790                 .name = "ab3100-fuelgauge",
 791                 .id = -1,
 792         },
 793         {
 794                 .name = "ab3100-vibrator",
 795                 .id = -1,
 796         },
 797         {
 798                 .name = "ab3100-otp",
 799                 .id = -1,
 800         },
 801         {
 802                 .name = "ab3100-codec",
 803                 .id = -1,
 804         },
 805 };
 806
 807 struct ab_family_id {
 808         u8      id;
 809         char    *name;
 810 };
 811
 812 static const struct ab_family_id ids[] __devinitdata = {
 813         /* AB3100 */
 814         {
 815                 .id = 0xc0,
 816                 .name = "P1A"
 817         }, {
 818                 .id = 0xc1,
 819                 .name = "P1B"
 820         }, {
 821                 .id = 0xc2,
 822                 .name = "P1C"
 823         }, {
 824                 .id = 0xc3,
 825                 .name = "P1D"
 826         }, {
 827                 .id = 0xc4,
 828                 .name = "P1E"
 829         }, {
 830                 .id = 0xc5,
 831                 .name = "P1F/R1A"
 832         }, {
 833                 .id = 0xc6,
 834                 .name = "P1G/R1A"
 835         }, {
 836                 .id = 0xc7,
 837                 .name = "P2A/R2A"
 838         }, {
 839                 .id = 0xc8,
 840                 .name = "P2B/R2B"
 841         },
 842         /* AB3000 variants, not supported */
 843         {
 844                 .id = 0xa0
 845         }, {
 846                 .id = 0xa1
 847         }, {
 848                 .id = 0xa2
 849         }, {
 850                 .id = 0xa3
 851         }, {
 852                 .id = 0xa4
 853         }, {
 854                 .id = 0xa5
 855         }, {
 856                 .id = 0xa6
 857         }, {
 858                 .id = 0xa7
 859         },
 860         /* Terminator */
 861         {
 862                 .id = 0x00,
 863         },
 864 };
 865
 866 static int __devinit ab3100_probe(struct i2c_client *client,
 867                                   const struct i2c_device_id *id)
 868 {
 869         struct ab3100 *ab3100;
 870         struct ab3100_platform_data *ab3100_plf_data =
 871                 client->dev.platform_data;
 872         int err;
 873         int i;
 874
 875         ab3100 = kzalloc(sizeof(struct ab3100), GFP_KERNEL);
 876         if (!ab3100) {
 877                 dev_err(&client->dev, "could not allocate AB3100 device\n");
 878                 return -ENOMEM;
 879         }
 880
 881         /* Initialize data structure */
 882         mutex_init(&ab3100->access_mutex);
 883         BLOCKING_INIT_NOTIFIER_HEAD(&ab3100->event_subscribers);
 884
 885         ab3100->i2c_client = client;
 886         ab3100->dev = &ab3100->i2c_client->dev;
 887
 888         i2c_set_clientdata(client, ab3100);
 889
 890         /* Read chip ID register */
 891         err = ab3100_get_register_interruptible(ab3100, AB3100_CID,
 892                                                 &ab3100->chip_id);
 893         if (err) {
 894                 dev_err(&client->dev,
 895                         "could not communicate with the AB3100 analog "
 896                         "baseband chip\n");
 897                 goto exit_no_detect;
 898         }
 899
 900         for (i = 0; ids[i].id != 0x0; i++) {
 901                 if (ids[i].id == ab3100->chip_id) {
 902                         if (ids[i].name != NULL) {
 903                                 snprintf(&ab3100->chip_name[0],
 904                                          sizeof(ab3100->chip_name) - 1,
 905                                          "AB3100 %s",
 906                                          ids[i].name);
 907                                 break;
 908                         } else {
 909                                 dev_err(&client->dev,
 910                                         "AB3000 is not supported\n");
 911                                 goto exit_no_detect;
 912                         }
 913                 }
 914         }
 915
 916         if (ids[i].id == 0x0) {
 917                 dev_err(&client->dev, "unknown analog baseband chip id: 0x%x\n",
 918                         ab3100->chip_id);
 919                 dev_err(&client->dev, "accepting it anyway. Please update "
 920                         "the driver.\n");
 921                 goto exit_no_detect;
 922         }
 923
 924         dev_info(&client->dev, "Detected chip: %s\n",
 925                  &ab3100->chip_name[0]);
 926
 927         /* Attach a second dummy i2c_client to the test register address */
 928         ab3100->testreg_client = i2c_new_dummy(client->adapter,
 929                                                      client->addr + 1);
 930         if (!ab3100->testreg_client) {
 931                 err = -ENOMEM;
 932                 goto exit_no_testreg_client;
 933         }
 934
 935         err = ab3100_setup(ab3100);
 936         if (err)
 937                 goto exit_no_setup;
 938
 939         err = request_threaded_irq(client->irq, NULL, ab3100_irq_handler,
 940                                 IRQF_ONESHOT, "ab3100-core", ab3100);
 941         /* This real unpredictable IRQ is of course sampled for entropy */
 942         rand_initialize_irq(client->irq);
 943
 944         if (err)
 945                 goto exit_no_irq;
 946
 947         err = abx500_register_ops(&client->dev, &ab3100_ops);
 948         if (err)
 949                 goto exit_no_ops;
 950
 951         /* Set up and register the platform devices. */
 952         for (i = 0; i < ARRAY_SIZE(ab3100_devs); i++)
 953                 ab3100_devs[i].mfd_data = ab3100_plf_data;
 954
 955         err = mfd_add_devices(&client->dev, 0, ab3100_devs,
 956                 ARRAY_SIZE(ab3100_devs), NULL, 0);
 957
 958         ab3100_setup_debugfs(ab3100);
 959
 960         return 0;
 961
 962  exit_no_ops:
 963  exit_no_irq:
 964  exit_no_setup:
 965         i2c_unregister_device(ab3100->testreg_client);
 966  exit_no_testreg_client:
 967  exit_no_detect:
 968         kfree(ab3100);
 969         return err;
 970 }
 971
 972 static int __devexit ab3100_remove(struct i2c_client *client)
 973 {
 974         struct ab3100 *ab3100 = i2c_get_clientdata(client);
 975
 976         /* Unregister subdevices */
 977         mfd_remove_devices(&client->dev);
 978
 979         ab3100_remove_debugfs();
 980         i2c_unregister_device(ab3100->testreg_client);
 981
 982         /*
 983          * At this point, all subscribers should have unregistered
 984          * their notifiers so deactivate IRQ
 985          */
 986         free_irq(client->irq, ab3100);
 987         kfree(ab3100);
 988         return 0;
 989 }
 990
 991 static const struct i2c_device_id ab3100_id[] = {
 992         { "ab3100", 0 },
 993         { }
 994 };
 995 MODULE_DEVICE_TABLE(i2c, ab3100_id);
 996
 997 static struct i2c_driver ab3100_driver = {
 998         .driver = {
 999                 .name   = "ab3100",
1000                 .owner  = THIS_MODULE,
1001         },
1002         .id_table       = ab3100_id,
1003         .probe          = ab3100_probe,
1004         .remove         = __devexit_p(ab3100_remove),
1005 };
1006
1007 static int __init ab3100_i2c_init(void)
1008 {
1009         return i2c_add_driver(&ab3100_driver);
1010 }
1011
1012 static void __exit ab3100_i2c_exit(void)
1013 {
1014         i2c_del_driver(&ab3100_driver);
1015 }
1016
1017 subsys_initcall(ab3100_i2c_init);
1018 module_exit(ab3100_i2c_exit);
1019
1020 MODULE_AUTHOR("Linus Walleij <linus.walleij@stericsson.com>");
1021 MODULE_DESCRIPTION("AB3100 core driver");
1022 MODULE_LICENSE("GPL");