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   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 /*
 369  * This is a threaded interrupt handler so we can make some
 370  * I2C calls etc.
 371  */
 372 static irqreturn_t ab3100_irq_handler(int irq, void *data)
 373 {
 374         struct ab3100 *ab3100 = data;
 375         u8 event_regs[3];
 376         u32 fatevent;
 377         int err;
 378
 379         err = ab3100_get_register_page_interruptible(ab3100, AB3100_EVENTA1,
 380                                        event_regs, 3);
 381         if (err)
 382                 goto err_event;
 383
 384         fatevent = (event_regs[0] << 16) |
 385                 (event_regs[1] << 8) |
 386                 event_regs[2];
 387
 388         if (!ab3100->startup_events_read) {
 389                 ab3100->startup_events = fatevent;
 390                 ab3100->startup_events_read = true;
 391         }
 392         /*
 393          * The notified parties will have to mask out the events
 394          * they're interested in and react to them. They will be
 395          * notified on all events, then they use the fatevent value
 396          * to determine if they're interested.
 397          */
 398         blocking_notifier_call_chain(&ab3100->event_subscribers,
 399                                      fatevent, NULL);
 400
 401         dev_dbg(ab3100->dev,
 402                 "IRQ Event: 0x%08x\n", fatevent);
 403
 404         return IRQ_HANDLED;
 405
 406  err_event:
 407         dev_dbg(ab3100->dev,
 408                 "error reading event status\n");
 409         return IRQ_HANDLED;
 410 }
 411
 412 #ifdef CONFIG_DEBUG_FS
 413 /*
 414  * Some debugfs entries only exposed if we're using debug
 415  */
 416 static int ab3100_registers_print(struct seq_file *s, void *p)
 417 {
 418         struct ab3100 *ab3100 = s->private;
 419         u8 value;
 420         u8 reg;
 421
 422         seq_printf(s, "AB3100 registers:\n");
 423
 424         for (reg = 0; reg < 0xff; reg++) {
 425                 ab3100_get_register_interruptible(ab3100, reg, &value);
 426                 seq_printf(s, "[0x%x]:  0x%x\n", reg, value);
 427         }
 428         return 0;
 429 }
 430
 431 static int ab3100_registers_open(struct inode *inode, struct file *file)
 432 {
 433         return single_open(file, ab3100_registers_print, inode->i_private);
 434 }
 435
 436 static const struct file_operations ab3100_registers_fops = {
 437         .open = ab3100_registers_open,
 438         .read = seq_read,
 439         .llseek = seq_lseek,
 440         .release = single_release,
 441         .owner = THIS_MODULE,
 442 };
 443
 444 struct ab3100_get_set_reg_priv {
 445         struct ab3100 *ab3100;
 446         bool mode;
 447 };
 448
 449 static int ab3100_get_set_reg_open_file(struct inode *inode, struct file *file)
 450 {
 451         file->private_data = inode->i_private;
 452         return 0;
 453 }
 454
 455 static ssize_t ab3100_get_set_reg(struct file *file,
 456                                   const char __user *user_buf,
 457                                   size_t count, loff_t *ppos)
 458 {
 459         struct ab3100_get_set_reg_priv *priv = file->private_data;
 460         struct ab3100 *ab3100 = priv->ab3100;
 461         char buf[32];
 462         ssize_t buf_size;
 463         int regp;
 464         unsigned long user_reg;
 465         int err;
 466         int i = 0;
 467
 468         /* Get userspace string and assure termination */
 469         buf_size = min(count, (sizeof(buf)-1));
 470         if (copy_from_user(buf, user_buf, buf_size))
 471                 return -EFAULT;
 472         buf[buf_size] = 0;
 473
 474         /*
 475          * The idea is here to parse a string which is either
 476          * "0xnn" for reading a register, or "0xaa 0xbb" for
 477          * writing 0xbb to the register 0xaa. First move past
 478          * whitespace and then begin to parse the register.
 479          */
 480         while ((i < buf_size) && (buf[i] == ' '))
 481                 i++;
 482         regp = i;
 483
 484         /*
 485          * Advance pointer to end of string then terminate
 486          * the register string. This is needed to satisfy
 487          * the strict_strtoul() function.
 488          */
 489         while ((i < buf_size) && (buf[i] != ' '))
 490                 i++;
 491         buf[i] = '\0';
 492
 493         err = strict_strtoul(&buf[regp], 16, &user_reg);
 494         if (err)
 495                 return err;
 496         if (user_reg > 0xff)
 497                 return -EINVAL;
 498
 499         /* Either we read or we write a register here */
 500         if (!priv->mode) {
 501                 /* Reading */
 502                 u8 reg = (u8) user_reg;
 503                 u8 regvalue;
 504
 505                 ab3100_get_register_interruptible(ab3100, reg, &regvalue);
 506
 507                 dev_info(ab3100->dev,
 508                          "debug read AB3100 reg[0x%02x]: 0x%02x\n",
 509                          reg, regvalue);
 510         } else {
 511                 int valp;
 512                 unsigned long user_value;
 513                 u8 reg = (u8) user_reg;
 514                 u8 value;
 515                 u8 regvalue;
 516
 517                 /*
 518                  * Writing, we need some value to write to
 519                  * the register so keep parsing the string
 520                  * from userspace.
 521                  */
 522                 i++;
 523                 while ((i < buf_size) && (buf[i] == ' '))
 524                         i++;
 525                 valp = i;
 526                 while ((i < buf_size) && (buf[i] != ' '))
 527                         i++;
 528                 buf[i] = '\0';
 529
 530                 err = strict_strtoul(&buf[valp], 16, &user_value);
 531                 if (err)
 532                         return err;
 533                 if (user_reg > 0xff)
 534                         return -EINVAL;
 535
 536                 value = (u8) user_value;
 537                 ab3100_set_register_interruptible(ab3100, reg, value);
 538                 ab3100_get_register_interruptible(ab3100, reg, &regvalue);
 539
 540                 dev_info(ab3100->dev,
 541                          "debug write reg[0x%02x] with 0x%02x, "
 542                          "after readback: 0x%02x\n",
 543                          reg, value, regvalue);
 544         }
 545         return buf_size;
 546 }
 547
 548 static const struct file_operations ab3100_get_set_reg_fops = {
 549         .open = ab3100_get_set_reg_open_file,
 550         .write = ab3100_get_set_reg,
 551 };
 552
 553 static struct dentry *ab3100_dir;
 554 static struct dentry *ab3100_reg_file;
 555 static struct ab3100_get_set_reg_priv ab3100_get_priv;
 556 static struct dentry *ab3100_get_reg_file;
 557 static struct ab3100_get_set_reg_priv ab3100_set_priv;
 558 static struct dentry *ab3100_set_reg_file;
 559
 560 static void ab3100_setup_debugfs(struct ab3100 *ab3100)
 561 {
 562         int err;
 563
 564         ab3100_dir = debugfs_create_dir("ab3100", NULL);
 565         if (!ab3100_dir)
 566                 goto exit_no_debugfs;
 567
 568         ab3100_reg_file = debugfs_create_file("registers",
 569                                 S_IRUGO, ab3100_dir, ab3100,
 570                                 &ab3100_registers_fops);
 571         if (!ab3100_reg_file) {
 572                 err = -ENOMEM;
 573                 goto exit_destroy_dir;
 574         }
 575
 576         ab3100_get_priv.ab3100 = ab3100;
 577         ab3100_get_priv.mode = false;
 578         ab3100_get_reg_file = debugfs_create_file("get_reg",
 579                                 S_IWUGO, ab3100_dir, &ab3100_get_priv,
 580                                 &ab3100_get_set_reg_fops);
 581         if (!ab3100_get_reg_file) {
 582                 err = -ENOMEM;
 583                 goto exit_destroy_reg;
 584         }
 585
 586         ab3100_set_priv.ab3100 = ab3100;
 587         ab3100_set_priv.mode = true;
 588         ab3100_set_reg_file = debugfs_create_file("set_reg",
 589                                 S_IWUGO, ab3100_dir, &ab3100_set_priv,
 590                                 &ab3100_get_set_reg_fops);
 591         if (!ab3100_set_reg_file) {
 592                 err = -ENOMEM;
 593                 goto exit_destroy_get_reg;
 594         }
 595         return;
 596
 597  exit_destroy_get_reg:
 598         debugfs_remove(ab3100_get_reg_file);
 599  exit_destroy_reg:
 600         debugfs_remove(ab3100_reg_file);
 601  exit_destroy_dir:
 602         debugfs_remove(ab3100_dir);
 603  exit_no_debugfs:
 604         return;
 605 }
 606 static inline void ab3100_remove_debugfs(void)
 607 {
 608         debugfs_remove(ab3100_set_reg_file);
 609         debugfs_remove(ab3100_get_reg_file);
 610         debugfs_remove(ab3100_reg_file);
 611         debugfs_remove(ab3100_dir);
 612 }
 613 #else
 614 static inline void ab3100_setup_debugfs(struct ab3100 *ab3100)
 615 {
 616 }
 617 static inline void ab3100_remove_debugfs(void)
 618 {
 619 }
 620 #endif
 621
 622 /*
 623  * Basic set-up, datastructure creation/destruction and I2C interface.
 624  * This sets up a default config in the AB3100 chip so that it
 625  * will work as expected.
 626  */
 627
 628 struct ab3100_init_setting {
 629         u8 abreg;
 630         u8 setting;
 631 };
 632
 633 static const struct ab3100_init_setting __initconst
 634 ab3100_init_settings[] = {
 635         {
 636                 .abreg = AB3100_MCA,
 637                 .setting = 0x01
 638         }, {
 639                 .abreg = AB3100_MCB,
 640                 .setting = 0x30
 641         }, {
 642                 .abreg = AB3100_IMRA1,
 643                 .setting = 0x00
 644         }, {
 645                 .abreg = AB3100_IMRA2,
 646                 .setting = 0xFF
 647         }, {
 648                 .abreg = AB3100_IMRA3,
 649                 .setting = 0x01
 650         }, {
 651                 .abreg = AB3100_IMRB1,
 652                 .setting = 0xBF
 653         }, {
 654                 .abreg = AB3100_IMRB2,
 655                 .setting = 0xFF
 656         }, {
 657                 .abreg = AB3100_IMRB3,
 658                 .setting = 0xFF
 659         }, {
 660                 .abreg = AB3100_SUP,
 661                 .setting = 0x00
 662         }, {
 663                 .abreg = AB3100_DIS,
 664                 .setting = 0xF0
 665         }, {
 666                 .abreg = AB3100_D0C,
 667                 .setting = 0x00
 668         }, {
 669                 .abreg = AB3100_D1C,
 670                 .setting = 0x00
 671         }, {
 672                 .abreg = AB3100_D2C,
 673                 .setting = 0x00
 674         }, {
 675                 .abreg = AB3100_D3C,
 676                 .setting = 0x00
 677         },
 678 };
 679
 680 static int __init ab3100_setup(struct ab3100 *ab3100)
 681 {
 682         int err = 0;
 683         int i;
 684
 685         for (i = 0; i < ARRAY_SIZE(ab3100_init_settings); i++) {
 686                 err = ab3100_set_register_interruptible(ab3100,
 687                                           ab3100_init_settings[i].abreg,
 688                                           ab3100_init_settings[i].setting);
 689                 if (err)
 690                         goto exit_no_setup;
 691         }
 692
 693         /*
 694          * Special trick to make the AB3100 use the 32kHz clock (RTC)
 695          * bit 3 in test register 0x02 is a special, undocumented test
 696          * register bit that only exist in AB3100 P1E
 697          */
 698         if (ab3100->chip_id == 0xc4) {
 699                 dev_warn(ab3100->dev,
 700                          "AB3100 P1E variant detected, "
 701                          "forcing chip to 32KHz\n");
 702                 err = ab3100_set_test_register_interruptible(ab3100, 0x02, 0x08);
 703         }
 704
 705  exit_no_setup:
 706         return err;
 707 }
 708
 709 /*
 710  * Here we define all the platform devices that appear
 711  * as children of the AB3100. These are regular platform
 712  * devices with the IORESOURCE_IO .start and .end set
 713  * to correspond to the internal AB3100 register range
 714  * mapping to the corresponding subdevice.
 715  */
 716
 717 #define AB3100_DEVICE(devname, devid)                           \
 718 static struct platform_device ab3100_##devname##_device = {     \
 719         .name           = devid,                                \
 720         .id             = -1,                                   \
 721 }
 722
 723 /*
 724  * This lists all the subdevices and corresponding register
 725  * ranges.
 726  */
 727 AB3100_DEVICE(dac, "ab3100-dac");
 728 AB3100_DEVICE(leds, "ab3100-leds");
 729 AB3100_DEVICE(power, "ab3100-power");
 730 AB3100_DEVICE(regulators, "ab3100-regulators");
 731 AB3100_DEVICE(sim, "ab3100-sim");
 732 AB3100_DEVICE(uart, "ab3100-uart");
 733 AB3100_DEVICE(rtc, "ab3100-rtc");
 734 AB3100_DEVICE(charger, "ab3100-charger");
 735 AB3100_DEVICE(boost, "ab3100-boost");
 736 AB3100_DEVICE(adc, "ab3100-adc");
 737 AB3100_DEVICE(fuelgauge, "ab3100-fuelgauge");
 738 AB3100_DEVICE(vibrator, "ab3100-vibrator");
 739 AB3100_DEVICE(otp, "ab3100-otp");
 740 AB3100_DEVICE(codec, "ab3100-codec");
 741
 742 static struct platform_device *
 743 ab3100_platform_devs[] = {
 744         &ab3100_dac_device,
 745         &ab3100_leds_device,
 746         &ab3100_power_device,
 747         &ab3100_regulators_device,
 748         &ab3100_sim_device,
 749         &ab3100_uart_device,
 750         &ab3100_rtc_device,
 751         &ab3100_charger_device,
 752         &ab3100_boost_device,
 753         &ab3100_adc_device,
 754         &ab3100_fuelgauge_device,
 755         &ab3100_vibrator_device,
 756         &ab3100_otp_device,
 757         &ab3100_codec_device,
 758 };
 759
 760 struct ab_family_id {
 761         u8      id;
 762         char    *name;
 763 };
 764
 765 static const struct ab_family_id ids[] __initdata = {
 766         /* AB3100 */
 767         {
 768                 .id = 0xc0,
 769                 .name = "P1A"
 770         }, {
 771                 .id = 0xc1,
 772                 .name = "P1B"
 773         }, {
 774                 .id = 0xc2,
 775                 .name = "P1C"
 776         }, {
 777                 .id = 0xc3,
 778                 .name = "P1D"
 779         }, {
 780                 .id = 0xc4,
 781                 .name = "P1E"
 782         }, {
 783                 .id = 0xc5,
 784                 .name = "P1F/R1A"
 785         }, {
 786                 .id = 0xc6,
 787                 .name = "P1G/R1A"
 788         }, {
 789                 .id = 0xc7,
 790                 .name = "P2A/R2A"
 791         }, {
 792                 .id = 0xc8,
 793                 .name = "P2B/R2B"
 794         },
 795         /* AB3000 variants, not supported */
 796         {
 797                 .id = 0xa0
 798         }, {
 799                 .id = 0xa1
 800         }, {
 801                 .id = 0xa2
 802         }, {
 803                 .id = 0xa3
 804         }, {
 805                 .id = 0xa4
 806         }, {
 807                 .id = 0xa5
 808         }, {
 809                 .id = 0xa6
 810         }, {
 811                 .id = 0xa7
 812         },
 813         /* Terminator */
 814         {
 815                 .id = 0x00,
 816         },
 817 };
 818
 819 static int __init ab3100_probe(struct i2c_client *client,
 820                         const struct i2c_device_id *id)
 821 {
 822         struct ab3100 *ab3100;
 823         struct ab3100_platform_data *ab3100_plf_data =
 824                 client->dev.platform_data;
 825         int err;
 826         int i;
 827
 828         ab3100 = kzalloc(sizeof(struct ab3100), GFP_KERNEL);
 829         if (!ab3100) {
 830                 dev_err(&client->dev, "could not allocate AB3100 device\n");
 831                 return -ENOMEM;
 832         }
 833
 834         /* Initialize data structure */
 835         mutex_init(&ab3100->access_mutex);
 836         BLOCKING_INIT_NOTIFIER_HEAD(&ab3100->event_subscribers);
 837
 838         ab3100->i2c_client = client;
 839         ab3100->dev = &ab3100->i2c_client->dev;
 840
 841         i2c_set_clientdata(client, ab3100);
 842
 843         /* Read chip ID register */
 844         err = ab3100_get_register_interruptible(ab3100, AB3100_CID,
 845                                                 &ab3100->chip_id);
 846         if (err) {
 847                 dev_err(&client->dev,
 848                         "could not communicate with the AB3100 analog "
 849                         "baseband chip\n");
 850                 goto exit_no_detect;
 851         }
 852
 853         for (i = 0; ids[i].id != 0x0; i++) {
 854                 if (ids[i].id == ab3100->chip_id) {
 855                         if (ids[i].name != NULL) {
 856                                 snprintf(&ab3100->chip_name[0],
 857                                          sizeof(ab3100->chip_name) - 1,
 858                                          "AB3100 %s",
 859                                          ids[i].name);
 860                                 break;
 861                         } else {
 862                                 dev_err(&client->dev,
 863                                         "AB3000 is not supported\n");
 864                                 goto exit_no_detect;
 865                         }
 866                 }
 867         }
 868
 869         if (ids[i].id == 0x0) {
 870                 dev_err(&client->dev, "unknown analog baseband chip id: 0x%x\n",
 871                         ab3100->chip_id);
 872                 dev_err(&client->dev, "accepting it anyway. Please update "
 873                         "the driver.\n");
 874                 goto exit_no_detect;
 875         }
 876
 877         dev_info(&client->dev, "Detected chip: %s\n",
 878                  &ab3100->chip_name[0]);
 879
 880         /* Attach a second dummy i2c_client to the test register address */
 881         ab3100->testreg_client = i2c_new_dummy(client->adapter,
 882                                                      client->addr + 1);
 883         if (!ab3100->testreg_client) {
 884                 err = -ENOMEM;
 885                 goto exit_no_testreg_client;
 886         }
 887
 888         err = ab3100_setup(ab3100);
 889         if (err)
 890                 goto exit_no_setup;
 891
 892         /* This real unpredictable IRQ is of course sampled for entropy */
 893         err = request_threaded_irq(client->irq, NULL, ab3100_irq_handler,
 894                           IRQF_ONESHOT,
 895                           "ab3100-core", ab3100);
 896         if (err)
 897                 goto exit_no_irq;
 898
 899         /* Set parent and a pointer back to the container in device data */
 900         for (i = 0; i < ARRAY_SIZE(ab3100_platform_devs); i++) {
 901                 ab3100_platform_devs[i]->dev.parent =
 902                         &client->dev;
 903                 ab3100_platform_devs[i]->dev.platform_data =
 904                         ab3100_plf_data;
 905                 platform_set_drvdata(ab3100_platform_devs[i], ab3100);
 906         }
 907
 908         /* Register the platform devices */
 909         platform_add_devices(ab3100_platform_devs,
 910                              ARRAY_SIZE(ab3100_platform_devs));
 911
 912         ab3100_setup_debugfs(ab3100);
 913
 914         return 0;
 915
 916  exit_no_irq:
 917  exit_no_setup:
 918         i2c_unregister_device(ab3100->testreg_client);
 919  exit_no_testreg_client:
 920  exit_no_detect:
 921         kfree(ab3100);
 922         return err;
 923 }
 924
 925 static int __exit ab3100_remove(struct i2c_client *client)
 926 {
 927         struct ab3100 *ab3100 = i2c_get_clientdata(client);
 928         int i;
 929
 930         /* Unregister subdevices */
 931         for (i = 0; i < ARRAY_SIZE(ab3100_platform_devs); i++)
 932                 platform_device_unregister(ab3100_platform_devs[i]);
 933
 934         ab3100_remove_debugfs();
 935         i2c_unregister_device(ab3100->testreg_client);
 936
 937         /*
 938          * At this point, all subscribers should have unregistered
 939          * their notifiers so deactivate IRQ
 940          */
 941         free_irq(client->irq, ab3100);
 942         kfree(ab3100);
 943         return 0;
 944 }
 945
 946 static const struct i2c_device_id ab3100_id[] = {
 947         { "ab3100", 0 },
 948         { }
 949 };
 950 MODULE_DEVICE_TABLE(i2c, ab3100_id);
 951
 952 static struct i2c_driver ab3100_driver = {
 953         .driver = {
 954                 .name   = "ab3100",
 955                 .owner  = THIS_MODULE,
 956         },
 957         .id_table       = ab3100_id,
 958         .probe          = ab3100_probe,
 959         .remove         = __exit_p(ab3100_remove),
 960 };
 961
 962 static int __init ab3100_i2c_init(void)
 963 {
 964         return i2c_add_driver(&ab3100_driver);
 965 }
 966
 967 static void __exit ab3100_i2c_exit(void)
 968 {
 969         i2c_del_driver(&ab3100_driver);
 970 }
 971
 972 subsys_initcall(ab3100_i2c_init);
 973 module_exit(ab3100_i2c_exit);
 974
 975 MODULE_AUTHOR("Linus Walleij <linus.walleij@stericsson.com>");
 976 MODULE_DESCRIPTION("AB3100 core driver");
 977 MODULE_LICENSE("GPL");