drivers/mfd/ab3100-core.c

   1 /*
   2  * Copyright (C) 2007-2009 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/err.h>
  14 #include <linux/platform_device.h>
  15 #include <linux/device.h>
  16 #include <linux/interrupt.h>
  17 #include <linux/debugfs.h>
  18 #include <linux/seq_file.h>
  19 #include <linux/uaccess.h>
  20 #include <linux/mfd/ab3100.h>
  21
  22 /* These are the only registers inside AB3100 used in this main file */
  23
  24 /* Interrupt event registers */
  25 #define AB3100_EVENTA1          0x21
  26 #define AB3100_EVENTA2          0x22
  27 #define AB3100_EVENTA3          0x23
  28
  29 /* AB3100 DAC converter registers */
  30 #define AB3100_DIS              0x00
  31 #define AB3100_D0C              0x01
  32 #define AB3100_D1C              0x02
  33 #define AB3100_D2C              0x03
  34 #define AB3100_D3C              0x04
  35
  36 /* Chip ID register */
  37 #define AB3100_CID              0x20
  38
  39 /* AB3100 interrupt registers */
  40 #define AB3100_IMRA1            0x24
  41 #define AB3100_IMRA2            0x25
  42 #define AB3100_IMRA3            0x26
  43 #define AB3100_IMRB1            0x2B
  44 #define AB3100_IMRB2            0x2C
  45 #define AB3100_IMRB3            0x2D
  46
  47 /* System Power Monitoring and control registers */
  48 #define AB3100_MCA              0x2E
  49 #define AB3100_MCB              0x2F
  50
  51 /* SIM power up */
  52 #define AB3100_SUP              0x50
  53
  54 /*
  55  * I2C communication
  56  *
  57  * The AB3100 is usually assigned address 0x48 (7-bit)
  58  * The chip is defined in the platform i2c_board_data section.
  59  */
  60
  61 u8 ab3100_get_chip_type(struct ab3100 *ab3100)
  62 {
  63         u8 chip = ABUNKNOWN;
  64
  65         switch (ab3100->chip_id & 0xf0) {
  66         case  0xa0:
  67                 chip = AB3000;
  68                 break;
  69         case  0xc0:
  70                 chip = AB3100;
  71                 break;
  72         }
  73         return chip;
  74 }
  75 EXPORT_SYMBOL(ab3100_get_chip_type);
  76
  77 int ab3100_set_register_interruptible(struct ab3100 *ab3100, u8 reg, u8 regval)
  78 {
  79         u8 regandval[2] = {reg, regval};
  80         int err;
  81
  82         err = mutex_lock_interruptible(&ab3100->access_mutex);
  83         if (err)
  84                 return err;
  85
  86         /*
  87          * A two-byte write message with the first byte containing the register
  88          * number and the second byte containing the value to be written
  89          * effectively sets a register in the AB3100.
  90          */
  91         err = i2c_master_send(ab3100->i2c_client, regandval, 2);
  92         if (err < 0) {
  93                 dev_err(ab3100->dev,
  94                         "write error (write register): %d\n",
  95                         err);
  96         } else if (err != 2) {
  97                 dev_err(ab3100->dev,
  98                         "write error (write register) "
  99                         "%d bytes transferred (expected 2)\n",
 100                         err);
 101                 err = -EIO;
 102         } else {
 103                 /* All is well */
 104                 err = 0;
 105         }
 106         mutex_unlock(&ab3100->access_mutex);
 107         return err;
 108 }
 109 EXPORT_SYMBOL(ab3100_set_register_interruptible);
 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
 150 int ab3100_get_register_interruptible(struct ab3100 *ab3100, 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 EXPORT_SYMBOL(ab3100_get_register_interruptible);
 205
 206
 207 int ab3100_get_register_page_interruptible(struct ab3100 *ab3100,
 208                              u8 first_reg, u8 *regvals, u8 numregs)
 209 {
 210         int err;
 211
 212         if (ab3100->chip_id == 0xa0 ||
 213             ab3100->chip_id == 0xa1)
 214                 /* These don't support paged reads */
 215                 return -EIO;
 216
 217         err = mutex_lock_interruptible(&ab3100->access_mutex);
 218         if (err)
 219                 return err;
 220
 221         /*
 222          * Paged read also require an I2C "stop" command.
 223          */
 224         err = i2c_master_send(ab3100->i2c_client, &first_reg, 1);
 225         if (err < 0) {
 226                 dev_err(ab3100->dev,
 227                         "write error (send first register address): %d\n",
 228                         err);
 229                 goto get_reg_page_out_unlock;
 230         } else if (err != 1) {
 231                 dev_err(ab3100->dev,
 232                         "write error (send first register address) "
 233                         "%d bytes transferred (expected 1)\n",
 234                         err);
 235                 err = -EIO;
 236                 goto get_reg_page_out_unlock;
 237         }
 238
 239         err = i2c_master_recv(ab3100->i2c_client, regvals, numregs);
 240         if (err < 0) {
 241                 dev_err(ab3100->dev,
 242                         "write error (read register page): %d\n",
 243                         err);
 244                 goto get_reg_page_out_unlock;
 245         } else if (err != numregs) {
 246                 dev_err(ab3100->dev,
 247                         "write error (read register page) "
 248                         "%d bytes transferred (expected %d)\n",
 249                         err, numregs);
 250                 err = -EIO;
 251                 goto get_reg_page_out_unlock;
 252         }
 253
 254         /* All is well */
 255         err = 0;
 256
 257  get_reg_page_out_unlock:
 258         mutex_unlock(&ab3100->access_mutex);
 259         return err;
 260 }
 261 EXPORT_SYMBOL(ab3100_get_register_page_interruptible);
 262
 263
 264 int ab3100_mask_and_set_register_interruptible(struct ab3100 *ab3100,
 265                                  u8 reg, u8 andmask, u8 ormask)
 266 {
 267         u8 regandval[2] = {reg, 0};
 268         int err;
 269
 270         err = mutex_lock_interruptible(&ab3100->access_mutex);
 271         if (err)
 272                 return err;
 273
 274         /* First read out the target register */
 275         err = i2c_master_send(ab3100->i2c_client, &reg, 1);
 276         if (err < 0) {
 277                 dev_err(ab3100->dev,
 278                         "write error (maskset send address): %d\n",
 279                         err);
 280                 goto get_maskset_unlock;
 281         } else if (err != 1) {
 282                 dev_err(ab3100->dev,
 283                         "write error (maskset send address) "
 284                         "%d bytes transferred (expected 1)\n",
 285                         err);
 286                 err = -EIO;
 287                 goto get_maskset_unlock;
 288         }
 289
 290         err = i2c_master_recv(ab3100->i2c_client, &regandval[1], 1);
 291         if (err < 0) {
 292                 dev_err(ab3100->dev,
 293                         "write error (maskset read register): %d\n",
 294                         err);
 295                 goto get_maskset_unlock;
 296         } else if (err != 1) {
 297                 dev_err(ab3100->dev,
 298                         "write error (maskset read register) "
 299                         "%d bytes transferred (expected 1)\n",
 300                         err);
 301                 err = -EIO;
 302                 goto get_maskset_unlock;
 303         }
 304
 305         /* Modify the register */
 306         regandval[1] &= andmask;
 307         regandval[1] |= ormask;
 308
 309         /* Write the register */
 310         err = i2c_master_send(ab3100->i2c_client, regandval, 2);
 311         if (err < 0) {
 312                 dev_err(ab3100->dev,
 313                         "write error (write register): %d\n",
 314                         err);
 315                 goto get_maskset_unlock;
 316         } else if (err != 2) {
 317                 dev_err(ab3100->dev,
 318                         "write error (write register) "
 319                         "%d bytes transferred (expected 2)\n",
 320                         err);
 321                 err = -EIO;
 322                 goto get_maskset_unlock;
 323         }
 324
 325         /* All is well */
 326         err = 0;
 327
 328  get_maskset_unlock:
 329         mutex_unlock(&ab3100->access_mutex);
 330         return err;
 331 }
 332 EXPORT_SYMBOL(ab3100_mask_and_set_register_interruptible);
 333
 334
 335 /*
 336  * Register a simple callback for handling any AB3100 events.
 337  */
 338 int ab3100_event_register(struct ab3100 *ab3100,
 339                           struct notifier_block *nb)
 340 {
 341         return blocking_notifier_chain_register(&ab3100->event_subscribers,
 342                                                nb);
 343 }
 344 EXPORT_SYMBOL(ab3100_event_register);
 345
 346 /*
 347  * Remove a previously registered callback.
 348  */
 349 int ab3100_event_unregister(struct ab3100 *ab3100,
 350                             struct notifier_block *nb)
 351 {
 352   return blocking_notifier_chain_unregister(&ab3100->event_subscribers,
 353                                             nb);
 354 }
 355 EXPORT_SYMBOL(ab3100_event_unregister);
 356
 357
 358 int ab3100_event_registers_startup_state_get(struct ab3100 *ab3100,
 359                                              u32 *fatevent)
 360 {
 361         if (!ab3100->startup_events_read)
 362                 return -EAGAIN; /* Try again later */
 363         *fatevent = ab3100->startup_events;
 364         return 0;
 365 }
 366 EXPORT_SYMBOL(ab3100_event_registers_startup_state_get);
 367
 368 /* Interrupt handling worker */
 369 static void ab3100_work(struct work_struct *work)
 370 {
 371         struct ab3100 *ab3100 = container_of(work, struct ab3100, work);
 372         u8 event_regs[3];
 373         u32 fatevent;
 374         int err;
 375
 376         err = ab3100_get_register_page_interruptible(ab3100, AB3100_EVENTA1,
 377                                        event_regs, 3);
 378         if (err)
 379                 goto err_event_wq;
 380
 381         fatevent = (event_regs[0] << 16) |
 382                 (event_regs[1] << 8) |
 383                 event_regs[2];
 384
 385         if (!ab3100->startup_events_read) {
 386                 ab3100->startup_events = fatevent;
 387                 ab3100->startup_events_read = true;
 388         }
 389         /*
 390          * The notified parties will have to mask out the events
 391          * they're interested in and react to them. They will be
 392          * notified on all events, then they use the fatevent value
 393          * to determine if they're interested.
 394          */
 395         blocking_notifier_call_chain(&ab3100->event_subscribers,
 396                                      fatevent, NULL);
 397
 398         dev_dbg(ab3100->dev,
 399                 "IRQ Event: 0x%08x\n", fatevent);
 400
 401         /* By now the IRQ should be acked and deasserted so enable it again */
 402         enable_irq(ab3100->i2c_client->irq);
 403         return;
 404
 405  err_event_wq:
 406         dev_dbg(ab3100->dev,
 407                 "error in event workqueue\n");
 408         /* Enable the IRQ anyway, what choice do we have? */
 409         enable_irq(ab3100->i2c_client->irq);
 410         return;
 411 }
 412
 413 static irqreturn_t ab3100_irq_handler(int irq, void *data)
 414 {
 415         struct ab3100 *ab3100 = data;
 416         /*
 417          * Disable the IRQ and dispatch a worker to handle the
 418          * event. Since the chip resides on I2C this is slow
 419          * stuff and we will re-enable the interrupts once th
 420          * worker has finished.
 421          */
 422         disable_irq_nosync(irq);
 423         schedule_work(&ab3100->work);
 424         return IRQ_HANDLED;
 425 }
 426
 427 #ifdef CONFIG_DEBUG_FS
 428 /*
 429  * Some debugfs entries only exposed if we're using debug
 430  */
 431 static int ab3100_registers_print(struct seq_file *s, void *p)
 432 {
 433         struct ab3100 *ab3100 = s->private;
 434         u8 value;
 435         u8 reg;
 436
 437         seq_printf(s, "AB3100 registers:\n");
 438
 439         for (reg = 0; reg < 0xff; reg++) {
 440                 ab3100_get_register_interruptible(ab3100, reg, &value);
 441                 seq_printf(s, "[0x%x]:  0x%x\n", reg, value);
 442         }
 443         return 0;
 444 }
 445
 446 static int ab3100_registers_open(struct inode *inode, struct file *file)
 447 {
 448         return single_open(file, ab3100_registers_print, inode->i_private);
 449 }
 450
 451 static const struct file_operations ab3100_registers_fops = {
 452         .open = ab3100_registers_open,
 453         .read = seq_read,
 454         .llseek = seq_lseek,
 455         .release = single_release,
 456         .owner = THIS_MODULE,
 457 };
 458
 459 struct ab3100_get_set_reg_priv {
 460         struct ab3100 *ab3100;
 461         bool mode;
 462 };
 463
 464 static int ab3100_get_set_reg_open_file(struct inode *inode, struct file *file)
 465 {
 466         file->private_data = inode->i_private;
 467         return 0;
 468 }
 469
 470 static ssize_t ab3100_get_set_reg(struct file *file,
 471                                   const char __user *user_buf,
 472                                   size_t count, loff_t *ppos)
 473 {
 474         struct ab3100_get_set_reg_priv *priv = file->private_data;
 475         struct ab3100 *ab3100 = priv->ab3100;
 476         char buf[32];
 477         ssize_t buf_size;
 478         int regp;
 479         unsigned long user_reg;
 480         int err;
 481         int i = 0;
 482
 483         /* Get userspace string and assure termination */
 484         buf_size = min(count, (sizeof(buf)-1));
 485         if (copy_from_user(buf, user_buf, buf_size))
 486                 return -EFAULT;
 487         buf[buf_size] = 0;
 488
 489         /*
 490          * The idea is here to parse a string which is either
 491          * "0xnn" for reading a register, or "0xaa 0xbb" for
 492          * writing 0xbb to the register 0xaa. First move past
 493          * whitespace and then begin to parse the register.
 494          */
 495         while ((i < buf_size) && (buf[i] == ' '))
 496                 i++;
 497         regp = i;
 498
 499         /*
 500          * Advance pointer to end of string then terminate
 501          * the register string. This is needed to satisfy
 502          * the strict_strtoul() function.
 503          */
 504         while ((i < buf_size) && (buf[i] != ' '))
 505                 i++;
 506         buf[i] = '\0';
 507
 508         err = strict_strtoul(&buf[regp], 16, &user_reg);
 509         if (err)
 510                 return err;
 511         if (user_reg > 0xff)
 512                 return -EINVAL;
 513
 514         /* Either we read or we write a register here */
 515         if (!priv->mode) {
 516                 /* Reading */
 517                 u8 reg = (u8) user_reg;
 518                 u8 regvalue;
 519
 520                 ab3100_get_register_interruptible(ab3100, reg, &regvalue);
 521
 522                 dev_info(ab3100->dev,
 523                          "debug read AB3100 reg[0x%02x]: 0x%02x\n",
 524                          reg, regvalue);
 525         } else {
 526                 int valp;
 527                 unsigned long user_value;
 528                 u8 reg = (u8) user_reg;
 529                 u8 value;
 530                 u8 regvalue;
 531
 532                 /*
 533                  * Writing, we need some value to write to
 534                  * the register so keep parsing the string
 535                  * from userspace.
 536                  */
 537                 i++;
 538                 while ((i < buf_size) && (buf[i] == ' '))
 539                         i++;
 540                 valp = i;
 541                 while ((i < buf_size) && (buf[i] != ' '))
 542                         i++;
 543                 buf[i] = '\0';
 544
 545                 err = strict_strtoul(&buf[valp], 16, &user_value);
 546                 if (err)
 547                         return err;
 548                 if (user_reg > 0xff)
 549                         return -EINVAL;
 550
 551                 value = (u8) user_value;
 552                 ab3100_set_register_interruptible(ab3100, reg, value);
 553                 ab3100_get_register_interruptible(ab3100, reg, &regvalue);
 554
 555                 dev_info(ab3100->dev,
 556                          "debug write reg[0x%02x] with 0x%02x, "
 557                          "after readback: 0x%02x\n",
 558                          reg, value, regvalue);
 559         }
 560         return buf_size;
 561 }
 562
 563 static const struct file_operations ab3100_get_set_reg_fops = {
 564         .open = ab3100_get_set_reg_open_file,
 565         .write = ab3100_get_set_reg,
 566 };
 567
 568 static struct dentry *ab3100_dir;
 569 static struct dentry *ab3100_reg_file;
 570 static struct ab3100_get_set_reg_priv ab3100_get_priv;
 571 static struct dentry *ab3100_get_reg_file;
 572 static struct ab3100_get_set_reg_priv ab3100_set_priv;
 573 static struct dentry *ab3100_set_reg_file;
 574
 575 static void ab3100_setup_debugfs(struct ab3100 *ab3100)
 576 {
 577         int err;
 578
 579         ab3100_dir = debugfs_create_dir("ab3100", NULL);
 580         if (!ab3100_dir)
 581                 goto exit_no_debugfs;
 582
 583         ab3100_reg_file = debugfs_create_file("registers",
 584                                 S_IRUGO, ab3100_dir, ab3100,
 585                                 &ab3100_registers_fops);
 586         if (!ab3100_reg_file) {
 587                 err = -ENOMEM;
 588                 goto exit_destroy_dir;
 589         }
 590
 591         ab3100_get_priv.ab3100 = ab3100;
 592         ab3100_get_priv.mode = false;
 593         ab3100_get_reg_file = debugfs_create_file("get_reg",
 594                                 S_IWUGO, ab3100_dir, &ab3100_get_priv,
 595                                 &ab3100_get_set_reg_fops);
 596         if (!ab3100_get_reg_file) {
 597                 err = -ENOMEM;
 598                 goto exit_destroy_reg;
 599         }
 600
 601         ab3100_set_priv.ab3100 = ab3100;
 602         ab3100_set_priv.mode = true;
 603         ab3100_set_reg_file = debugfs_create_file("set_reg",
 604                                 S_IWUGO, ab3100_dir, &ab3100_set_priv,
 605                                 &ab3100_get_set_reg_fops);
 606         if (!ab3100_set_reg_file) {
 607                 err = -ENOMEM;
 608                 goto exit_destroy_get_reg;
 609         }
 610         return;
 611
 612  exit_destroy_get_reg:
 613         debugfs_remove(ab3100_get_reg_file);
 614  exit_destroy_reg:
 615         debugfs_remove(ab3100_reg_file);
 616  exit_destroy_dir:
 617         debugfs_remove(ab3100_dir);
 618  exit_no_debugfs:
 619         return;
 620 }
 621 static inline void ab3100_remove_debugfs(void)
 622 {
 623         debugfs_remove(ab3100_set_reg_file);
 624         debugfs_remove(ab3100_get_reg_file);
 625         debugfs_remove(ab3100_reg_file);
 626         debugfs_remove(ab3100_dir);
 627 }
 628 #else
 629 static inline void ab3100_setup_debugfs(struct ab3100 *ab3100)
 630 {
 631 }
 632 static inline void ab3100_remove_debugfs(void)
 633 {
 634 }
 635 #endif
 636
 637 /*
 638  * Basic set-up, datastructure creation/destruction and I2C interface.
 639  * This sets up a default config in the AB3100 chip so that it
 640  * will work as expected.
 641  */
 642
 643 struct ab3100_init_setting {
 644         u8 abreg;
 645         u8 setting;
 646 };
 647
 648 static const struct ab3100_init_setting __initconst
 649 ab3100_init_settings[] = {
 650         {
 651                 .abreg = AB3100_MCA,
 652                 .setting = 0x01
 653         }, {
 654                 .abreg = AB3100_MCB,
 655                 .setting = 0x30
 656         }, {
 657                 .abreg = AB3100_IMRA1,
 658                 .setting = 0x00
 659         }, {
 660                 .abreg = AB3100_IMRA2,
 661                 .setting = 0xFF
 662         }, {
 663                 .abreg = AB3100_IMRA3,
 664                 .setting = 0x01
 665         }, {
 666                 .abreg = AB3100_IMRB1,
 667                 .setting = 0xBF
 668         }, {
 669                 .abreg = AB3100_IMRB2,
 670                 .setting = 0xFF
 671         }, {
 672                 .abreg = AB3100_IMRB3,
 673                 .setting = 0xFF
 674         }, {
 675                 .abreg = AB3100_SUP,
 676                 .setting = 0x00
 677         }, {
 678                 .abreg = AB3100_DIS,
 679                 .setting = 0xF0
 680         }, {
 681                 .abreg = AB3100_D0C,
 682                 .setting = 0x00
 683         }, {
 684                 .abreg = AB3100_D1C,
 685                 .setting = 0x00
 686         }, {
 687                 .abreg = AB3100_D2C,
 688                 .setting = 0x00
 689         }, {
 690                 .abreg = AB3100_D3C,
 691                 .setting = 0x00
 692         },
 693 };
 694
 695 static int __init ab3100_setup(struct ab3100 *ab3100)
 696 {
 697         int err = 0;
 698         int i;
 699
 700         for (i = 0; i < ARRAY_SIZE(ab3100_init_settings); i++) {
 701                 err = ab3100_set_register_interruptible(ab3100,
 702                                           ab3100_init_settings[i].abreg,
 703                                           ab3100_init_settings[i].setting);
 704                 if (err)
 705                         goto exit_no_setup;
 706         }
 707
 708         /*
 709          * Special trick to make the AB3100 use the 32kHz clock (RTC)
 710          * bit 3 in test register 0x02 is a special, undocumented test
 711          * register bit that only exist in AB3100 P1E
 712          */
 713         if (ab3100->chip_id == 0xc4) {
 714                 dev_warn(ab3100->dev,
 715                          "AB3100 P1E variant detected, "
 716                          "forcing chip to 32KHz\n");
 717                 err = ab3100_set_test_register_interruptible(ab3100, 0x02, 0x08);
 718         }
 719
 720  exit_no_setup:
 721         return err;
 722 }
 723
 724 /*
 725  * Here we define all the platform devices that appear
 726  * as children of the AB3100. These are regular platform
 727  * devices with the IORESOURCE_IO .start and .end set
 728  * to correspond to the internal AB3100 register range
 729  * mapping to the corresponding subdevice.
 730  */
 731
 732 #define AB3100_DEVICE(devname, devid)                           \
 733 static struct platform_device ab3100_##devname##_device = {     \
 734         .name           = devid,                                \
 735         .id             = -1,                                   \
 736 }
 737
 738 /*
 739  * This lists all the subdevices and corresponding register
 740  * ranges.
 741  */
 742 AB3100_DEVICE(dac, "ab3100-dac");
 743 AB3100_DEVICE(leds, "ab3100-leds");
 744 AB3100_DEVICE(power, "ab3100-power");
 745 AB3100_DEVICE(regulators, "ab3100-regulators");
 746 AB3100_DEVICE(sim, "ab3100-sim");
 747 AB3100_DEVICE(uart, "ab3100-uart");
 748 AB3100_DEVICE(rtc, "ab3100-rtc");
 749 AB3100_DEVICE(charger, "ab3100-charger");
 750 AB3100_DEVICE(boost, "ab3100-boost");
 751 AB3100_DEVICE(adc, "ab3100-adc");
 752 AB3100_DEVICE(fuelgauge, "ab3100-fuelgauge");
 753 AB3100_DEVICE(vibrator, "ab3100-vibrator");
 754 AB3100_DEVICE(otp, "ab3100-otp");
 755 AB3100_DEVICE(codec, "ab3100-codec");
 756
 757 static struct platform_device *
 758 ab3100_platform_devs[] = {
 759         &ab3100_dac_device,
 760         &ab3100_leds_device,
 761         &ab3100_power_device,
 762         &ab3100_regulators_device,
 763         &ab3100_sim_device,
 764         &ab3100_uart_device,
 765         &ab3100_rtc_device,
 766         &ab3100_charger_device,
 767         &ab3100_boost_device,
 768         &ab3100_adc_device,
 769         &ab3100_fuelgauge_device,
 770         &ab3100_vibrator_device,
 771         &ab3100_otp_device,
 772         &ab3100_codec_device,
 773 };
 774
 775 struct ab_family_id {
 776         u8      id;
 777         char    *name;
 778 };
 779
 780 static const struct ab_family_id ids[] __initdata = {
 781         /* AB3100 */
 782         {
 783                 .id = 0xc0,
 784                 .name = "P1A"
 785         }, {
 786                 .id = 0xc1,
 787                 .name = "P1B"
 788         }, {
 789                 .id = 0xc2,
 790                 .name = "P1C"
 791         }, {
 792                 .id = 0xc3,
 793                 .name = "P1D"
 794         }, {
 795                 .id = 0xc4,
 796                 .name = "P1E"
 797         }, {
 798                 .id = 0xc5,
 799                 .name = "P1F/R1A"
 800         }, {
 801                 .id = 0xc6,
 802                 .name = "P1G/R1A"
 803         }, {
 804                 .id = 0xc7,
 805                 .name = "P2A/R2A"
 806         }, {
 807                 .id = 0xc8,
 808                 .name = "P2B/R2B"
 809         },
 810         /* AB3000 variants, not supported */
 811         {
 812                 .id = 0xa0
 813         }, {
 814                 .id = 0xa1
 815         }, {
 816                 .id = 0xa2
 817         }, {
 818                 .id = 0xa3
 819         }, {
 820                 .id = 0xa4
 821         }, {
 822                 .id = 0xa5
 823         }, {
 824                 .id = 0xa6
 825         }, {
 826                 .id = 0xa7
 827         },
 828         /* Terminator */
 829         {
 830                 .id = 0x00,
 831         },
 832 };
 833
 834 static int __init ab3100_probe(struct i2c_client *client,
 835                         const struct i2c_device_id *id)
 836 {
 837         struct ab3100 *ab3100;
 838         struct ab3100_platform_data *ab3100_plf_data =
 839                 client->dev.platform_data;
 840         int err;
 841         int i;
 842
 843         ab3100 = kzalloc(sizeof(struct ab3100), GFP_KERNEL);
 844         if (!ab3100) {
 845                 dev_err(&client->dev, "could not allocate AB3100 device\n");
 846                 return -ENOMEM;
 847         }
 848
 849         /* Initialize data structure */
 850         mutex_init(&ab3100->access_mutex);
 851         BLOCKING_INIT_NOTIFIER_HEAD(&ab3100->event_subscribers);
 852
 853         ab3100->i2c_client = client;
 854         ab3100->dev = &ab3100->i2c_client->dev;
 855
 856         i2c_set_clientdata(client, ab3100);
 857
 858         /* Read chip ID register */
 859         err = ab3100_get_register_interruptible(ab3100, AB3100_CID,
 860                                                 &ab3100->chip_id);
 861         if (err) {
 862                 dev_err(&client->dev,
 863                         "could not communicate with the AB3100 analog "
 864                         "baseband chip\n");
 865                 goto exit_no_detect;
 866         }
 867
 868         for (i = 0; ids[i].id != 0x0; i++) {
 869                 if (ids[i].id == ab3100->chip_id) {
 870                         if (ids[i].name != NULL) {
 871                                 snprintf(&ab3100->chip_name[0],
 872                                          sizeof(ab3100->chip_name) - 1,
 873                                          "AB3100 %s",
 874                                          ids[i].name);
 875                                 break;
 876                         } else {
 877                                 dev_err(&client->dev,
 878                                         "AB3000 is not supported\n");
 879                                 goto exit_no_detect;
 880                         }
 881                 }
 882         }
 883
 884         if (ids[i].id == 0x0) {
 885                 dev_err(&client->dev, "unknown analog baseband chip id: 0x%x\n",
 886                         ab3100->chip_id);
 887                 dev_err(&client->dev, "accepting it anyway. Please update "
 888                         "the driver.\n");
 889                 goto exit_no_detect;
 890         }
 891
 892         dev_info(&client->dev, "Detected chip: %s\n",
 893                  &ab3100->chip_name[0]);
 894
 895         /* Attach a second dummy i2c_client to the test register address */
 896         ab3100->testreg_client = i2c_new_dummy(client->adapter,
 897                                                      client->addr + 1);
 898         if (!ab3100->testreg_client) {
 899                 err = -ENOMEM;
 900                 goto exit_no_testreg_client;
 901         }
 902
 903         strlcpy(ab3100->testreg_client->name, id->name,
 904                 sizeof(ab3100->testreg_client->name));
 905
 906         err = ab3100_setup(ab3100);
 907         if (err)
 908                 goto exit_no_setup;
 909
 910         INIT_WORK(&ab3100->work, ab3100_work);
 911
 912         /* This real unpredictable IRQ is of course sampled for entropy */
 913         err = request_irq(client->irq, ab3100_irq_handler,
 914                           IRQF_DISABLED | IRQF_SAMPLE_RANDOM,
 915                           "AB3100 IRQ", ab3100);
 916         if (err)
 917                 goto exit_no_irq;
 918
 919         /* Set parent and a pointer back to the container in device data */
 920         for (i = 0; i < ARRAY_SIZE(ab3100_platform_devs); i++) {
 921                 ab3100_platform_devs[i]->dev.parent =
 922                         &client->dev;
 923                 ab3100_platform_devs[i]->dev.platform_data =
 924                         ab3100_plf_data;
 925                 platform_set_drvdata(ab3100_platform_devs[i], ab3100);
 926         }
 927
 928         /* Register the platform devices */
 929         platform_add_devices(ab3100_platform_devs,
 930                              ARRAY_SIZE(ab3100_platform_devs));
 931
 932         ab3100_setup_debugfs(ab3100);
 933
 934         return 0;
 935
 936  exit_no_irq:
 937  exit_no_setup:
 938         i2c_unregister_device(ab3100->testreg_client);
 939  exit_no_testreg_client:
 940  exit_no_detect:
 941         kfree(ab3100);
 942         return err;
 943 }
 944
 945 static int __exit ab3100_remove(struct i2c_client *client)
 946 {
 947         struct ab3100 *ab3100 = i2c_get_clientdata(client);
 948         int i;
 949
 950         /* Unregister subdevices */
 951         for (i = 0; i < ARRAY_SIZE(ab3100_platform_devs); i++)
 952                 platform_device_unregister(ab3100_platform_devs[i]);
 953
 954         ab3100_remove_debugfs();
 955         i2c_unregister_device(ab3100->testreg_client);
 956
 957         /*
 958          * At this point, all subscribers should have unregistered
 959          * their notifiers so deactivate IRQ
 960          */
 961         free_irq(client->irq, ab3100);
 962         kfree(ab3100);
 963         return 0;
 964 }
 965
 966 static const struct i2c_device_id ab3100_id[] = {
 967         { "ab3100", 0 },
 968         { }
 969 };
 970 MODULE_DEVICE_TABLE(i2c, ab3100_id);
 971
 972 static struct i2c_driver ab3100_driver = {
 973         .driver = {
 974                 .name   = "ab3100",
 975                 .owner  = THIS_MODULE,
 976         },
 977         .id_table       = ab3100_id,
 978         .probe          = ab3100_probe,
 979         .remove         = __exit_p(ab3100_remove),
 980 };
 981
 982 static int __init ab3100_i2c_init(void)
 983 {
 984         return i2c_add_driver(&ab3100_driver);
 985 }
 986
 987 static void __exit ab3100_i2c_exit(void)
 988 {
 989         i2c_del_driver(&ab3100_driver);
 990 }
 991
 992 subsys_initcall(ab3100_i2c_init);
 993 module_exit(ab3100_i2c_exit);
 994
 995 MODULE_AUTHOR("Linus Walleij <linus.walleij@stericsson.com>");
 996 MODULE_DESCRIPTION("AB3100 core driver");
 997 MODULE_LICENSE("GPL");