drivers/mfd/ab3100-core.c

   1 /*
   2  * Copyright (C) 2007-2010 ST-Ericsson
   3  * License terms: GNU General Public License (GPL) version 2
   4  * Low-level core for exclusive access to the AB3100 IC on the I2C bus
   5  * and some basic chip-configuration.
   6  * Author: Linus Walleij <linus.walleij@stericsson.com>
   7  */
   8
   9 #include <linux/i2c.h>
  10 #include <linux/mutex.h>
  11 #include <linux/list.h>
  12 #include <linux/notifier.h>
  13 #include <linux/slab.h>
  14 #include <linux/err.h>
  15 #include <linux/module.h>
  16 #include <linux/platform_device.h>
  17 #include <linux/device.h>
  18 #include <linux/interrupt.h>
  19 #include <linux/random.h>
  20 #include <linux/debugfs.h>
  21 #include <linux/seq_file.h>
  22 #include <linux/uaccess.h>
  23 #include <linux/mfd/core.h>
  24 #include <linux/mfd/ab3100.h>
  25 #include <linux/mfd/abx500.h>
  26
  27 /* These are the only registers inside AB3100 used in this main file */
  28
  29 /* Interrupt event registers */
  30 #define AB3100_EVENTA1          0x21
  31 #define AB3100_EVENTA2          0x22
  32 #define AB3100_EVENTA3          0x23
  33
  34 /* AB3100 DAC converter registers */
  35 #define AB3100_DIS              0x00
  36 #define AB3100_D0C              0x01
  37 #define AB3100_D1C              0x02
  38 #define AB3100_D2C              0x03
  39 #define AB3100_D3C              0x04
  40
  41 /* Chip ID register */
  42 #define AB3100_CID              0x20
  43
  44 /* AB3100 interrupt registers */
  45 #define AB3100_IMRA1            0x24
  46 #define AB3100_IMRA2            0x25
  47 #define AB3100_IMRA3            0x26
  48 #define AB3100_IMRB1            0x2B
  49 #define AB3100_IMRB2            0x2C
  50 #define AB3100_IMRB3            0x2D
  51
  52 /* System Power Monitoring and control registers */
  53 #define AB3100_MCA              0x2E
  54 #define AB3100_MCB              0x2F
  55
  56 /* SIM power up */
  57 #define AB3100_SUP              0x50
  58
  59 /*
  60  * I2C communication
  61  *
  62  * The AB3100 is usually assigned address 0x48 (7-bit)
  63  * The chip is defined in the platform i2c_board_data section.
  64  */
  65 static int ab3100_get_chip_id(struct device *dev)
  66 {
  67         struct ab3100 *ab3100 = dev_get_drvdata(dev->parent);
  68
  69         return (int)ab3100->chip_id;
  70 }
  71
  72 static int ab3100_set_register_interruptible(struct ab3100 *ab3100,
  73         u8 reg, u8 regval)
  74 {
  75         u8 regandval[2] = {reg, regval};
  76         int err;
  77
  78         err = mutex_lock_interruptible(&ab3100->access_mutex);
  79         if (err)
  80                 return err;
  81
  82         /*
  83          * A two-byte write message with the first byte containing the register
  84          * number and the second byte containing the value to be written
  85          * effectively sets a register in the AB3100.
  86          */
  87         err = i2c_master_send(ab3100->i2c_client, regandval, 2);
  88         if (err < 0) {
  89                 dev_err(ab3100->dev,
  90                         "write error (write register): %d\n",
  91                         err);
  92         } else if (err != 2) {
  93                 dev_err(ab3100->dev,
  94                         "write error (write register) "
  95                         "%d bytes transferred (expected 2)\n",
  96                         err);
  97                 err = -EIO;
  98         } else {
  99                 /* All is well */
 100                 err = 0;
 101         }
 102         mutex_unlock(&ab3100->access_mutex);
 103         return err;
 104 }
 105
 106 static int set_register_interruptible(struct device *dev,
 107         u8 bank, u8 reg, u8 value)
 108 {
 109         struct ab3100 *ab3100 = dev_get_drvdata(dev->parent);
 110
 111         return ab3100_set_register_interruptible(ab3100, reg, value);
 112 }
 113
 114 /*
 115  * The test registers exist at an I2C bus address up one
 116  * from the ordinary base. They are not supposed to be used
 117  * in production code, but sometimes you have to do that
 118  * anyway. It's currently only used from this file so declare
 119  * it static and do not export.
 120  */
 121 static int ab3100_set_test_register_interruptible(struct ab3100 *ab3100,
 122                                     u8 reg, u8 regval)
 123 {
 124         u8 regandval[2] = {reg, regval};
 125         int err;
 126
 127         err = mutex_lock_interruptible(&ab3100->access_mutex);
 128         if (err)
 129                 return err;
 130
 131         err = i2c_master_send(ab3100->testreg_client, regandval, 2);
 132         if (err < 0) {
 133                 dev_err(ab3100->dev,
 134                         "write error (write test register): %d\n",
 135                         err);
 136         } else if (err != 2) {
 137                 dev_err(ab3100->dev,
 138                         "write error (write test register) "
 139                         "%d bytes transferred (expected 2)\n",
 140                         err);
 141                 err = -EIO;
 142         } else {
 143                 /* All is well */
 144                 err = 0;
 145         }
 146         mutex_unlock(&ab3100->access_mutex);
 147
 148         return err;
 149 }
 150
 151 static int ab3100_get_register_interruptible(struct ab3100 *ab3100,
 152                                              u8 reg, u8 *regval)
 153 {
 154         int err;
 155
 156         err = mutex_lock_interruptible(&ab3100->access_mutex);
 157         if (err)
 158                 return err;
 159
 160         /*
 161          * AB3100 require an I2C "stop" command between each message, else
 162          * it will not work. The only way of achieveing this with the
 163          * message transport layer is to send the read and write messages
 164          * separately.
 165          */
 166         err = i2c_master_send(ab3100->i2c_client, &reg, 1);
 167         if (err < 0) {
 168                 dev_err(ab3100->dev,
 169                         "write error (send register address): %d\n",
 170                         err);
 171                 goto get_reg_out_unlock;
 172         } else if (err != 1) {
 173                 dev_err(ab3100->dev,
 174                         "write error (send register address) "
 175                         "%d bytes transferred (expected 1)\n",
 176                         err);
 177                 err = -EIO;
 178                 goto get_reg_out_unlock;
 179         } else {
 180                 /* All is well */
 181                 err = 0;
 182         }
 183
 184         err = i2c_master_recv(ab3100->i2c_client, regval, 1);
 185         if (err < 0) {
 186                 dev_err(ab3100->dev,
 187                         "write error (read register): %d\n",
 188                         err);
 189                 goto get_reg_out_unlock;
 190         } else if (err != 1) {
 191                 dev_err(ab3100->dev,
 192                         "write error (read register) "
 193                         "%d bytes transferred (expected 1)\n",
 194                         err);
 195                 err = -EIO;
 196                 goto get_reg_out_unlock;
 197         } else {
 198                 /* All is well */
 199                 err = 0;
 200         }
 201
 202  get_reg_out_unlock:
 203         mutex_unlock(&ab3100->access_mutex);
 204         return err;
 205 }
 206
 207 static int get_register_interruptible(struct device *dev, u8 bank, u8 reg,
 208                                       u8 *value)
 209 {
 210         struct ab3100 *ab3100 = dev_get_drvdata(dev->parent);
 211
 212         return ab3100_get_register_interruptible(ab3100, reg, value);
 213 }
 214
 215 static int ab3100_get_register_page_interruptible(struct ab3100 *ab3100,
 216                              u8 first_reg, u8 *regvals, u8 numregs)
 217 {
 218         int err;
 219
 220         if (ab3100->chip_id == 0xa0 ||
 221             ab3100->chip_id == 0xa1)
 222                 /* These don't support paged reads */
 223                 return -EIO;
 224
 225         err = mutex_lock_interruptible(&ab3100->access_mutex);
 226         if (err)
 227                 return err;
 228
 229         /*
 230          * Paged read also require an I2C "stop" command.
 231          */
 232         err = i2c_master_send(ab3100->i2c_client, &first_reg, 1);
 233         if (err < 0) {
 234                 dev_err(ab3100->dev,
 235                         "write error (send first register address): %d\n",
 236                         err);
 237                 goto get_reg_page_out_unlock;
 238         } else if (err != 1) {
 239                 dev_err(ab3100->dev,
 240                         "write error (send first register address) "
 241                         "%d bytes transferred (expected 1)\n",
 242                         err);
 243                 err = -EIO;
 244                 goto get_reg_page_out_unlock;
 245         }
 246
 247         err = i2c_master_recv(ab3100->i2c_client, regvals, numregs);
 248         if (err < 0) {
 249                 dev_err(ab3100->dev,
 250                         "write error (read register page): %d\n",
 251                         err);
 252                 goto get_reg_page_out_unlock;
 253         } else if (err != numregs) {
 254                 dev_err(ab3100->dev,
 255                         "write error (read register page) "
 256                         "%d bytes transferred (expected %d)\n",
 257                         err, numregs);
 258                 err = -EIO;
 259                 goto get_reg_page_out_unlock;
 260         }
 261
 262         /* All is well */
 263         err = 0;
 264
 265  get_reg_page_out_unlock:
 266         mutex_unlock(&ab3100->access_mutex);
 267         return err;
 268 }
 269
 270 static int get_register_page_interruptible(struct device *dev, u8 bank,
 271         u8 first_reg, u8 *regvals, u8 numregs)
 272 {
 273         struct ab3100 *ab3100 = dev_get_drvdata(dev->parent);
 274
 275         return ab3100_get_register_page_interruptible(ab3100,
 276                         first_reg, regvals, numregs);
 277 }
 278
 279 static int ab3100_mask_and_set_register_interruptible(struct ab3100 *ab3100,
 280                                  u8 reg, u8 andmask, u8 ormask)
 281 {
 282         u8 regandval[2] = {reg, 0};
 283         int err;
 284
 285         err = mutex_lock_interruptible(&ab3100->access_mutex);
 286         if (err)
 287                 return err;
 288
 289         /* First read out the target register */
 290         err = i2c_master_send(ab3100->i2c_client, &reg, 1);
 291         if (err < 0) {
 292                 dev_err(ab3100->dev,
 293                         "write error (maskset send address): %d\n",
 294                         err);
 295                 goto get_maskset_unlock;
 296         } else if (err != 1) {
 297                 dev_err(ab3100->dev,
 298                         "write error (maskset send address) "
 299                         "%d bytes transferred (expected 1)\n",
 300                         err);
 301                 err = -EIO;
 302                 goto get_maskset_unlock;
 303         }
 304
 305         err = i2c_master_recv(ab3100->i2c_client, &regandval[1], 1);
 306         if (err < 0) {
 307                 dev_err(ab3100->dev,
 308                         "write error (maskset read register): %d\n",
 309                         err);
 310                 goto get_maskset_unlock;
 311         } else if (err != 1) {
 312                 dev_err(ab3100->dev,
 313                         "write error (maskset read register) "
 314                         "%d bytes transferred (expected 1)\n",
 315                         err);
 316                 err = -EIO;
 317                 goto get_maskset_unlock;
 318         }
 319
 320         /* Modify the register */
 321         regandval[1] &= andmask;
 322         regandval[1] |= ormask;
 323
 324         /* Write the register */
 325         err = i2c_master_send(ab3100->i2c_client, regandval, 2);
 326         if (err < 0) {
 327                 dev_err(ab3100->dev,
 328                         "write error (write register): %d\n",
 329                         err);
 330                 goto get_maskset_unlock;
 331         } else if (err != 2) {
 332                 dev_err(ab3100->dev,
 333                         "write error (write register) "
 334                         "%d bytes transferred (expected 2)\n",
 335                         err);
 336                 err = -EIO;
 337                 goto get_maskset_unlock;
 338         }
 339
 340         /* All is well */
 341         err = 0;
 342
 343  get_maskset_unlock:
 344         mutex_unlock(&ab3100->access_mutex);
 345         return err;
 346 }
 347
 348 static int mask_and_set_register_interruptible(struct device *dev, u8 bank,
 349         u8 reg, u8 bitmask, u8 bitvalues)
 350 {
 351         struct ab3100 *ab3100 = dev_get_drvdata(dev->parent);
 352
 353         return ab3100_mask_and_set_register_interruptible(ab3100,
 354                         reg, bitmask, (bitmask & bitvalues));
 355 }
 356
 357 /*
 358  * Register a simple callback for handling any AB3100 events.
 359  */
 360 int ab3100_event_register(struct ab3100 *ab3100,
 361                           struct notifier_block *nb)
 362 {
 363         return blocking_notifier_chain_register(&ab3100->event_subscribers,
 364                                                nb);
 365 }
 366 EXPORT_SYMBOL(ab3100_event_register);
 367
 368 /*
 369  * Remove a previously registered callback.
 370  */
 371 int ab3100_event_unregister(struct ab3100 *ab3100,
 372                             struct notifier_block *nb)
 373 {
 374   return blocking_notifier_chain_unregister(&ab3100->event_subscribers,
 375                                             nb);
 376 }
 377 EXPORT_SYMBOL(ab3100_event_unregister);
 378
 379
 380 static int ab3100_event_registers_startup_state_get(struct device *dev,
 381                                              u8 *event)
 382 {
 383         struct ab3100 *ab3100 = dev_get_drvdata(dev->parent);
 384         if (!ab3100->startup_events_read)
 385                 return -EAGAIN; /* Try again later */
 386         memcpy(event, ab3100->startup_events, 3);
 387         return 0;
 388 }
 389
 390 static struct abx500_ops ab3100_ops = {
 391         .get_chip_id = ab3100_get_chip_id,
 392         .set_register = set_register_interruptible,
 393         .get_register = get_register_interruptible,
 394         .get_register_page = get_register_page_interruptible,
 395         .set_register_page = NULL,
 396         .mask_and_set_register = mask_and_set_register_interruptible,
 397         .event_registers_startup_state_get =
 398                 ab3100_event_registers_startup_state_get,
 399         .startup_irq_enabled = NULL,
 400 };
 401
 402 /*
 403  * This is a threaded interrupt handler so we can make some
 404  * I2C calls etc.
 405  */
 406 static irqreturn_t ab3100_irq_handler(int irq, void *data)
 407 {
 408         struct ab3100 *ab3100 = data;
 409         u8 event_regs[3];
 410         u32 fatevent;
 411         int err;
 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 ssize_t ab3100_get_set_reg(struct file *file,
 486                                   const char __user *user_buf,
 487                                   size_t count, loff_t *ppos)
 488 {
 489         struct ab3100_get_set_reg_priv *priv = file->private_data;
 490         struct ab3100 *ab3100 = priv->ab3100;
 491         char buf[32];
 492         ssize_t buf_size;
 493         int regp;
 494         u8 user_reg;
 495         int err;
 496         int i = 0;
 497
 498         /* Get userspace string and assure termination */
 499         buf_size = min(count, (sizeof(buf)-1));
 500         if (copy_from_user(buf, user_buf, buf_size))
 501                 return -EFAULT;
 502         buf[buf_size] = 0;
 503
 504         /*
 505          * The idea is here to parse a string which is either
 506          * "0xnn" for reading a register, or "0xaa 0xbb" for
 507          * writing 0xbb to the register 0xaa. First move past
 508          * whitespace and then begin to parse the register.
 509          */
 510         while ((i < buf_size) && (buf[i] == ' '))
 511                 i++;
 512         regp = i;
 513
 514         /*
 515          * Advance pointer to end of string then terminate
 516          * the register string. This is needed to satisfy
 517          * the kstrtou8() function.
 518          */
 519         while ((i < buf_size) && (buf[i] != ' '))
 520                 i++;
 521         buf[i] = '\0';
 522
 523         err = kstrtou8(&buf[regp], 16, &user_reg);
 524         if (err)
 525                 return err;
 526
 527         /* Either we read or we write a register here */
 528         if (!priv->mode) {
 529                 /* Reading */
 530                 u8 regvalue;
 531
 532                 ab3100_get_register_interruptible(ab3100, user_reg, &regvalue);
 533
 534                 dev_info(ab3100->dev,
 535                          "debug read AB3100 reg[0x%02x]: 0x%02x\n",
 536                          user_reg, regvalue);
 537         } else {
 538                 int valp;
 539                 u8 user_value;
 540                 u8 regvalue;
 541
 542                 /*
 543                  * Writing, we need some value to write to
 544                  * the register so keep parsing the string
 545                  * from userspace.
 546                  */
 547                 i++;
 548                 while ((i < buf_size) && (buf[i] == ' '))
 549                         i++;
 550                 valp = i;
 551                 while ((i < buf_size) && (buf[i] != ' '))
 552                         i++;
 553                 buf[i] = '\0';
 554
 555                 err = kstrtou8(&buf[valp], 16, &user_value);
 556                 if (err)
 557                         return err;
 558
 559                 ab3100_set_register_interruptible(ab3100, user_reg, user_value);
 560                 ab3100_get_register_interruptible(ab3100, user_reg, &regvalue);
 561
 562                 dev_info(ab3100->dev,
 563                          "debug write reg[0x%02x] with 0x%02x, "
 564                          "after readback: 0x%02x\n",
 565                          user_reg, user_value, regvalue);
 566         }
 567         return buf_size;
 568 }
 569
 570 static const struct file_operations ab3100_get_set_reg_fops = {
 571         .open = simple_open,
 572         .write = ab3100_get_set_reg,
 573         .llseek = noop_llseek,
 574 };
 575
 576 static struct dentry *ab3100_dir;
 577 static struct dentry *ab3100_reg_file;
 578 static struct ab3100_get_set_reg_priv ab3100_get_priv;
 579 static struct dentry *ab3100_get_reg_file;
 580 static struct ab3100_get_set_reg_priv ab3100_set_priv;
 581 static struct dentry *ab3100_set_reg_file;
 582
 583 static void ab3100_setup_debugfs(struct ab3100 *ab3100)
 584 {
 585         int err;
 586
 587         ab3100_dir = debugfs_create_dir("ab3100", NULL);
 588         if (!ab3100_dir)
 589                 goto exit_no_debugfs;
 590
 591         ab3100_reg_file = debugfs_create_file("registers",
 592                                 S_IRUGO, ab3100_dir, ab3100,
 593                                 &ab3100_registers_fops);
 594         if (!ab3100_reg_file) {
 595                 err = -ENOMEM;
 596                 goto exit_destroy_dir;
 597         }
 598
 599         ab3100_get_priv.ab3100 = ab3100;
 600         ab3100_get_priv.mode = false;
 601         ab3100_get_reg_file = debugfs_create_file("get_reg",
 602                                 S_IWUSR, ab3100_dir, &ab3100_get_priv,
 603                                 &ab3100_get_set_reg_fops);
 604         if (!ab3100_get_reg_file) {
 605                 err = -ENOMEM;
 606                 goto exit_destroy_reg;
 607         }
 608
 609         ab3100_set_priv.ab3100 = ab3100;
 610         ab3100_set_priv.mode = true;
 611         ab3100_set_reg_file = debugfs_create_file("set_reg",
 612                                 S_IWUSR, ab3100_dir, &ab3100_set_priv,
 613                                 &ab3100_get_set_reg_fops);
 614         if (!ab3100_set_reg_file) {
 615                 err = -ENOMEM;
 616                 goto exit_destroy_get_reg;
 617         }
 618         return;
 619
 620  exit_destroy_get_reg:
 621         debugfs_remove(ab3100_get_reg_file);
 622  exit_destroy_reg:
 623         debugfs_remove(ab3100_reg_file);
 624  exit_destroy_dir:
 625         debugfs_remove(ab3100_dir);
 626  exit_no_debugfs:
 627         return;
 628 }
 629 static inline void ab3100_remove_debugfs(void)
 630 {
 631         debugfs_remove(ab3100_set_reg_file);
 632         debugfs_remove(ab3100_get_reg_file);
 633         debugfs_remove(ab3100_reg_file);
 634         debugfs_remove(ab3100_dir);
 635 }
 636 #else
 637 static inline void ab3100_setup_debugfs(struct ab3100 *ab3100)
 638 {
 639 }
 640 static inline void ab3100_remove_debugfs(void)
 641 {
 642 }
 643 #endif
 644
 645 /*
 646  * Basic set-up, datastructure creation/destruction and I2C interface.
 647  * This sets up a default config in the AB3100 chip so that it
 648  * will work as expected.
 649  */
 650
 651 struct ab3100_init_setting {
 652         u8 abreg;
 653         u8 setting;
 654 };
 655
 656 static const struct ab3100_init_setting ab3100_init_settings[] = {
 657         {
 658                 .abreg = AB3100_MCA,
 659                 .setting = 0x01
 660         }, {
 661                 .abreg = AB3100_MCB,
 662                 .setting = 0x30
 663         }, {
 664                 .abreg = AB3100_IMRA1,
 665                 .setting = 0x00
 666         }, {
 667                 .abreg = AB3100_IMRA2,
 668                 .setting = 0xFF
 669         }, {
 670                 .abreg = AB3100_IMRA3,
 671                 .setting = 0x01
 672         }, {
 673                 .abreg = AB3100_IMRB1,
 674                 .setting = 0xBF
 675         }, {
 676                 .abreg = AB3100_IMRB2,
 677                 .setting = 0xFF
 678         }, {
 679                 .abreg = AB3100_IMRB3,
 680                 .setting = 0xFF
 681         }, {
 682                 .abreg = AB3100_SUP,
 683                 .setting = 0x00
 684         }, {
 685                 .abreg = AB3100_DIS,
 686                 .setting = 0xF0
 687         }, {
 688                 .abreg = AB3100_D0C,
 689                 .setting = 0x00
 690         }, {
 691                 .abreg = AB3100_D1C,
 692                 .setting = 0x00
 693         }, {
 694                 .abreg = AB3100_D2C,
 695                 .setting = 0x00
 696         }, {
 697                 .abreg = AB3100_D3C,
 698                 .setting = 0x00
 699         },
 700 };
 701
 702 static int ab3100_setup(struct ab3100 *ab3100)
 703 {
 704         int err = 0;
 705         int i;
 706
 707         for (i = 0; i < ARRAY_SIZE(ab3100_init_settings); i++) {
 708                 err = ab3100_set_register_interruptible(ab3100,
 709                                           ab3100_init_settings[i].abreg,
 710                                           ab3100_init_settings[i].setting);
 711                 if (err)
 712                         goto exit_no_setup;
 713         }
 714
 715         /*
 716          * Special trick to make the AB3100 use the 32kHz clock (RTC)
 717          * bit 3 in test register 0x02 is a special, undocumented test
 718          * register bit that only exist in AB3100 P1E
 719          */
 720         if (ab3100->chip_id == 0xc4) {
 721                 dev_warn(ab3100->dev,
 722                          "AB3100 P1E variant detected, "
 723                          "forcing chip to 32KHz\n");
 724                 err = ab3100_set_test_register_interruptible(ab3100,
 725                         0x02, 0x08);
 726         }
 727
 728  exit_no_setup:
 729         return err;
 730 }
 731
 732 /* The subdevices of the AB3100 */
 733 static struct mfd_cell ab3100_devs[] = {
 734         {
 735                 .name = "ab3100-dac",
 736                 .id = -1,
 737         },
 738         {
 739                 .name = "ab3100-leds",
 740                 .id = -1,
 741         },
 742         {
 743                 .name = "ab3100-power",
 744                 .id = -1,
 745         },
 746         {
 747                 .name = "ab3100-regulators",
 748                 .of_compatible = "stericsson,ab3100-regulators",
 749                 .id = -1,
 750         },
 751         {
 752                 .name = "ab3100-sim",
 753                 .id = -1,
 754         },
 755         {
 756                 .name = "ab3100-uart",
 757                 .id = -1,
 758         },
 759         {
 760                 .name = "ab3100-rtc",
 761                 .id = -1,
 762         },
 763         {
 764                 .name = "ab3100-charger",
 765                 .id = -1,
 766         },
 767         {
 768                 .name = "ab3100-boost",
 769                 .id = -1,
 770         },
 771         {
 772                 .name = "ab3100-adc",
 773                 .id = -1,
 774         },
 775         {
 776                 .name = "ab3100-fuelgauge",
 777                 .id = -1,
 778         },
 779         {
 780                 .name = "ab3100-vibrator",
 781                 .id = -1,
 782         },
 783         {
 784                 .name = "ab3100-otp",
 785                 .id = -1,
 786         },
 787         {
 788                 .name = "ab3100-codec",
 789                 .id = -1,
 790         },
 791 };
 792
 793 struct ab_family_id {
 794         u8      id;
 795         char    *name;
 796 };
 797
 798 static const struct ab_family_id ids[] = {
 799         /* AB3100 */
 800         {
 801                 .id = 0xc0,
 802                 .name = "P1A"
 803         }, {
 804                 .id = 0xc1,
 805                 .name = "P1B"
 806         }, {
 807                 .id = 0xc2,
 808                 .name = "P1C"
 809         }, {
 810                 .id = 0xc3,
 811                 .name = "P1D"
 812         }, {
 813                 .id = 0xc4,
 814                 .name = "P1E"
 815         }, {
 816                 .id = 0xc5,
 817                 .name = "P1F/R1A"
 818         }, {
 819                 .id = 0xc6,
 820                 .name = "P1G/R1A"
 821         }, {
 822                 .id = 0xc7,
 823                 .name = "P2A/R2A"
 824         }, {
 825                 .id = 0xc8,
 826                 .name = "P2B/R2B"
 827         },
 828         /* AB3000 variants, not supported */
 829         {
 830                 .id = 0xa0
 831         }, {
 832                 .id = 0xa1
 833         }, {
 834                 .id = 0xa2
 835         }, {
 836                 .id = 0xa3
 837         }, {
 838                 .id = 0xa4
 839         }, {
 840                 .id = 0xa5
 841         }, {
 842                 .id = 0xa6
 843         }, {
 844                 .id = 0xa7
 845         },
 846         /* Terminator */
 847         {
 848                 .id = 0x00,
 849         },
 850 };
 851
 852 static int ab3100_probe(struct i2c_client *client,
 853                                   const struct i2c_device_id *id)
 854 {
 855         struct ab3100 *ab3100;
 856         struct ab3100_platform_data *ab3100_plf_data =
 857                 client->dev.platform_data;
 858         int err;
 859         int i;
 860
 861         ab3100 = devm_kzalloc(&client->dev, sizeof(struct ab3100), GFP_KERNEL);
 862         if (!ab3100) {
 863                 dev_err(&client->dev, "could not allocate AB3100 device\n");
 864                 return -ENOMEM;
 865         }
 866
 867         /* Initialize data structure */
 868         mutex_init(&ab3100->access_mutex);
 869         BLOCKING_INIT_NOTIFIER_HEAD(&ab3100->event_subscribers);
 870
 871         ab3100->i2c_client = client;
 872         ab3100->dev = &ab3100->i2c_client->dev;
 873
 874         i2c_set_clientdata(client, ab3100);
 875
 876         /* Read chip ID register */
 877         err = ab3100_get_register_interruptible(ab3100, AB3100_CID,
 878                                                 &ab3100->chip_id);
 879         if (err) {
 880                 dev_err(&client->dev,
 881                         "could not communicate with the AB3100 analog "
 882                         "baseband chip\n");
 883                 goto exit_no_detect;
 884         }
 885
 886         for (i = 0; ids[i].id != 0x0; i++) {
 887                 if (ids[i].id == ab3100->chip_id) {
 888                         if (ids[i].name != NULL) {
 889                                 snprintf(&ab3100->chip_name[0],
 890                                          sizeof(ab3100->chip_name) - 1,
 891                                          "AB3100 %s",
 892                                          ids[i].name);
 893                                 break;
 894                         } else {
 895                                 dev_err(&client->dev,
 896                                         "AB3000 is not supported\n");
 897                                 goto exit_no_detect;
 898                         }
 899                 }
 900         }
 901
 902         if (ids[i].id == 0x0) {
 903                 dev_err(&client->dev, "unknown analog baseband chip id: 0x%x\n",
 904                         ab3100->chip_id);
 905                 dev_err(&client->dev, "accepting it anyway. Please update "
 906                         "the driver.\n");
 907                 goto exit_no_detect;
 908         }
 909
 910         dev_info(&client->dev, "Detected chip: %s\n",
 911                  &ab3100->chip_name[0]);
 912
 913         /* Attach a second dummy i2c_client to the test register address */
 914         ab3100->testreg_client = i2c_new_dummy(client->adapter,
 915                                                client->addr + 1);
 916         if (!ab3100->testreg_client) {
 917                 err = -ENOMEM;
 918                 goto exit_no_testreg_client;
 919         }
 920
 921         err = ab3100_setup(ab3100);
 922         if (err)
 923                 goto exit_no_setup;
 924
 925         err = devm_request_threaded_irq(&client->dev,
 926                                         client->irq, NULL, ab3100_irq_handler,
 927                                         IRQF_ONESHOT, "ab3100-core", ab3100);
 928         if (err)
 929                 goto exit_no_irq;
 930
 931         err = abx500_register_ops(&client->dev, &ab3100_ops);
 932         if (err)
 933                 goto exit_no_ops;
 934
 935         /* Set up and register the platform devices. */
 936         for (i = 0; i < ARRAY_SIZE(ab3100_devs); i++) {
 937                 ab3100_devs[i].platform_data = ab3100_plf_data;
 938                 ab3100_devs[i].pdata_size = sizeof(struct ab3100_platform_data);
 939         }
 940
 941         err = mfd_add_devices(&client->dev, 0, ab3100_devs,
 942                               ARRAY_SIZE(ab3100_devs), NULL, 0, NULL);
 943
 944         ab3100_setup_debugfs(ab3100);
 945
 946         return 0;
 947
 948  exit_no_ops:
 949  exit_no_irq:
 950  exit_no_setup:
 951         i2c_unregister_device(ab3100->testreg_client);
 952  exit_no_testreg_client:
 953  exit_no_detect:
 954         return err;
 955 }
 956
 957 static int ab3100_remove(struct i2c_client *client)
 958 {
 959         struct ab3100 *ab3100 = i2c_get_clientdata(client);
 960
 961         /* Unregister subdevices */
 962         mfd_remove_devices(&client->dev);
 963         ab3100_remove_debugfs();
 964         i2c_unregister_device(ab3100->testreg_client);
 965         return 0;
 966 }
 967
 968 static const struct i2c_device_id ab3100_id[] = {
 969         { "ab3100", 0 },
 970         { }
 971 };
 972 MODULE_DEVICE_TABLE(i2c, ab3100_id);
 973
 974 static struct i2c_driver ab3100_driver = {
 975         .driver = {
 976                 .name   = "ab3100",
 977                 .owner  = THIS_MODULE,
 978         },
 979         .id_table       = ab3100_id,
 980         .probe          = ab3100_probe,
 981         .remove         = ab3100_remove,
 982 };
 983
 984 static int __init ab3100_i2c_init(void)
 985 {
 986         return i2c_add_driver(&ab3100_driver);
 987 }
 988
 989 static void __exit ab3100_i2c_exit(void)
 990 {
 991         i2c_del_driver(&ab3100_driver);
 992 }
 993
 994 subsys_initcall(ab3100_i2c_init);
 995 module_exit(ab3100_i2c_exit);
 996
 997 MODULE_AUTHOR("Linus Walleij <linus.walleij@stericsson.com>");
 998 MODULE_DESCRIPTION("AB3100 core driver");
 999 MODULE_LICENSE("GPL");