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/err.h>
  14 #include <linux/platform_device.h>
  15 #include <linux/device.h>
  16 #include <linux/interrupt.h>
  17 #include <linux/random.h>
  18 #include <linux/debugfs.h>
  19 #include <linux/seq_file.h>
  20 #include <linux/uaccess.h>
  21 #include <linux/mfd/ab3100.h>
  22
  23 /* These are the only registers inside AB3100 used in this main file */
  24
  25 /* Interrupt event registers */
  26 #define AB3100_EVENTA1          0x21
  27 #define AB3100_EVENTA2          0x22
  28 #define AB3100_EVENTA3          0x23
  29
  30 /* AB3100 DAC converter registers */
  31 #define AB3100_DIS              0x00
  32 #define AB3100_D0C              0x01
  33 #define AB3100_D1C              0x02
  34 #define AB3100_D2C              0x03
  35 #define AB3100_D3C              0x04
  36
  37 /* Chip ID register */
  38 #define AB3100_CID              0x20
  39
  40 /* AB3100 interrupt registers */
  41 #define AB3100_IMRA1            0x24
  42 #define AB3100_IMRA2            0x25
  43 #define AB3100_IMRA3            0x26
  44 #define AB3100_IMRB1            0x2B
  45 #define AB3100_IMRB2            0x2C
  46 #define AB3100_IMRB3            0x2D
  47
  48 /* System Power Monitoring and control registers */
  49 #define AB3100_MCA              0x2E
  50 #define AB3100_MCB              0x2F
  51
  52 /* SIM power up */
  53 #define AB3100_SUP              0x50
  54
  55 /*
  56  * I2C communication
  57  *
  58  * The AB3100 is usually assigned address 0x48 (7-bit)
  59  * The chip is defined in the platform i2c_board_data section.
  60  */
  61
  62 u8 ab3100_get_chip_type(struct ab3100 *ab3100)
  63 {
  64         u8 chip = ABUNKNOWN;
  65
  66         switch (ab3100->chip_id & 0xf0) {
  67         case  0xa0:
  68                 chip = AB3000;
  69                 break;
  70         case  0xc0:
  71                 chip = AB3100;
  72                 break;
  73         }
  74         return chip;
  75 }
  76 EXPORT_SYMBOL(ab3100_get_chip_type);
  77
  78 int ab3100_set_register_interruptible(struct ab3100 *ab3100, u8 reg, u8 regval)
  79 {
  80         u8 regandval[2] = {reg, regval};
  81         int err;
  82
  83         err = mutex_lock_interruptible(&ab3100->access_mutex);
  84         if (err)
  85                 return err;
  86
  87         /*
  88          * A two-byte write message with the first byte containing the register
  89          * number and the second byte containing the value to be written
  90          * effectively sets a register in the AB3100.
  91          */
  92         err = i2c_master_send(ab3100->i2c_client, regandval, 2);
  93         if (err < 0) {
  94                 dev_err(ab3100->dev,
  95                         "write error (write register): %d\n",
  96                         err);
  97         } else if (err != 2) {
  98                 dev_err(ab3100->dev,
  99                         "write error (write register) "
 100                         "%d bytes transferred (expected 2)\n",
 101                         err);
 102                 err = -EIO;
 103         } else {
 104                 /* All is well */
 105                 err = 0;
 106         }
 107         mutex_unlock(&ab3100->access_mutex);
 108         return err;
 109 }
 110 EXPORT_SYMBOL(ab3100_set_register_interruptible);
 111
 112
 113 /*
 114  * The test registers exist at an I2C bus address up one
 115  * from the ordinary base. They are not supposed to be used
 116  * in production code, but sometimes you have to do that
 117  * anyway. It's currently only used from this file so declare
 118  * it static and do not export.
 119  */
 120 static int ab3100_set_test_register_interruptible(struct ab3100 *ab3100,
 121                                     u8 reg, u8 regval)
 122 {
 123         u8 regandval[2] = {reg, regval};
 124         int err;
 125
 126         err = mutex_lock_interruptible(&ab3100->access_mutex);
 127         if (err)
 128                 return err;
 129
 130         err = i2c_master_send(ab3100->testreg_client, regandval, 2);
 131         if (err < 0) {
 132                 dev_err(ab3100->dev,
 133                         "write error (write test register): %d\n",
 134                         err);
 135         } else if (err != 2) {
 136                 dev_err(ab3100->dev,
 137                         "write error (write test register) "
 138                         "%d bytes transferred (expected 2)\n",
 139                         err);
 140                 err = -EIO;
 141         } else {
 142                 /* All is well */
 143                 err = 0;
 144         }
 145         mutex_unlock(&ab3100->access_mutex);
 146
 147         return err;
 148 }
 149
 150
 151 int ab3100_get_register_interruptible(struct ab3100 *ab3100, u8 reg, u8 *regval)
 152 {
 153         int err;
 154
 155         err = mutex_lock_interruptible(&ab3100->access_mutex);
 156         if (err)
 157                 return err;
 158
 159         /*
 160          * AB3100 require an I2C "stop" command between each message, else
 161          * it will not work. The only way of achieveing this with the
 162          * message transport layer is to send the read and write messages
 163          * separately.
 164          */
 165         err = i2c_master_send(ab3100->i2c_client, &reg, 1);
 166         if (err < 0) {
 167                 dev_err(ab3100->dev,
 168                         "write error (send register address): %d\n",
 169                         err);
 170                 goto get_reg_out_unlock;
 171         } else if (err != 1) {
 172                 dev_err(ab3100->dev,
 173                         "write error (send register address) "
 174                         "%d bytes transferred (expected 1)\n",
 175                         err);
 176                 err = -EIO;
 177                 goto get_reg_out_unlock;
 178         } else {
 179                 /* All is well */
 180                 err = 0;
 181         }
 182
 183         err = i2c_master_recv(ab3100->i2c_client, regval, 1);
 184         if (err < 0) {
 185                 dev_err(ab3100->dev,
 186                         "write error (read register): %d\n",
 187                         err);
 188                 goto get_reg_out_unlock;
 189         } else if (err != 1) {
 190                 dev_err(ab3100->dev,
 191                         "write error (read register) "
 192                         "%d bytes transferred (expected 1)\n",
 193                         err);
 194                 err = -EIO;
 195                 goto get_reg_out_unlock;
 196         } else {
 197                 /* All is well */
 198                 err = 0;
 199         }
 200
 201  get_reg_out_unlock:
 202         mutex_unlock(&ab3100->access_mutex);
 203         return err;
 204 }
 205 EXPORT_SYMBOL(ab3100_get_register_interruptible);
 206
 207
 208 int ab3100_get_register_page_interruptible(struct ab3100 *ab3100,
 209                              u8 first_reg, u8 *regvals, u8 numregs)
 210 {
 211         int err;
 212
 213         if (ab3100->chip_id == 0xa0 ||
 214             ab3100->chip_id == 0xa1)
 215                 /* These don't support paged reads */
 216                 return -EIO;
 217
 218         err = mutex_lock_interruptible(&ab3100->access_mutex);
 219         if (err)
 220                 return err;
 221
 222         /*
 223          * Paged read also require an I2C "stop" command.
 224          */
 225         err = i2c_master_send(ab3100->i2c_client, &first_reg, 1);
 226         if (err < 0) {
 227                 dev_err(ab3100->dev,
 228                         "write error (send first register address): %d\n",
 229                         err);
 230                 goto get_reg_page_out_unlock;
 231         } else if (err != 1) {
 232                 dev_err(ab3100->dev,
 233                         "write error (send first register address) "
 234                         "%d bytes transferred (expected 1)\n",
 235                         err);
 236                 err = -EIO;
 237                 goto get_reg_page_out_unlock;
 238         }
 239
 240         err = i2c_master_recv(ab3100->i2c_client, regvals, numregs);
 241         if (err < 0) {
 242                 dev_err(ab3100->dev,
 243                         "write error (read register page): %d\n",
 244                         err);
 245                 goto get_reg_page_out_unlock;
 246         } else if (err != numregs) {
 247                 dev_err(ab3100->dev,
 248                         "write error (read register page) "
 249                         "%d bytes transferred (expected %d)\n",
 250                         err, numregs);
 251                 err = -EIO;
 252                 goto get_reg_page_out_unlock;
 253         }
 254
 255         /* All is well */
 256         err = 0;
 257
 258  get_reg_page_out_unlock:
 259         mutex_unlock(&ab3100->access_mutex);
 260         return err;
 261 }
 262 EXPORT_SYMBOL(ab3100_get_register_page_interruptible);
 263
 264
 265 int ab3100_mask_and_set_register_interruptible(struct ab3100 *ab3100,
 266                                  u8 reg, u8 andmask, u8 ormask)
 267 {
 268         u8 regandval[2] = {reg, 0};
 269         int err;
 270
 271         err = mutex_lock_interruptible(&ab3100->access_mutex);
 272         if (err)
 273                 return err;
 274
 275         /* First read out the target register */
 276         err = i2c_master_send(ab3100->i2c_client, &reg, 1);
 277         if (err < 0) {
 278                 dev_err(ab3100->dev,
 279                         "write error (maskset send address): %d\n",
 280                         err);
 281                 goto get_maskset_unlock;
 282         } else if (err != 1) {
 283                 dev_err(ab3100->dev,
 284                         "write error (maskset send address) "
 285                         "%d bytes transferred (expected 1)\n",
 286                         err);
 287                 err = -EIO;
 288                 goto get_maskset_unlock;
 289         }
 290
 291         err = i2c_master_recv(ab3100->i2c_client, &regandval[1], 1);
 292         if (err < 0) {
 293                 dev_err(ab3100->dev,
 294                         "write error (maskset read register): %d\n",
 295                         err);
 296                 goto get_maskset_unlock;
 297         } else if (err != 1) {
 298                 dev_err(ab3100->dev,
 299                         "write error (maskset read register) "
 300                         "%d bytes transferred (expected 1)\n",
 301                         err);
 302                 err = -EIO;
 303                 goto get_maskset_unlock;
 304         }
 305
 306         /* Modify the register */
 307         regandval[1] &= andmask;
 308         regandval[1] |= ormask;
 309
 310         /* Write the register */
 311         err = i2c_master_send(ab3100->i2c_client, regandval, 2);
 312         if (err < 0) {
 313                 dev_err(ab3100->dev,
 314                         "write error (write register): %d\n",
 315                         err);
 316                 goto get_maskset_unlock;
 317         } else if (err != 2) {
 318                 dev_err(ab3100->dev,
 319                         "write error (write register) "
 320                         "%d bytes transferred (expected 2)\n",
 321                         err);
 322                 err = -EIO;
 323                 goto get_maskset_unlock;
 324         }
 325
 326         /* All is well */
 327         err = 0;
 328
 329  get_maskset_unlock:
 330         mutex_unlock(&ab3100->access_mutex);
 331         return err;
 332 }
 333 EXPORT_SYMBOL(ab3100_mask_and_set_register_interruptible);
 334
 335
 336 /*
 337  * Register a simple callback for handling any AB3100 events.
 338  */
 339 int ab3100_event_register(struct ab3100 *ab3100,
 340                           struct notifier_block *nb)
 341 {
 342         return blocking_notifier_chain_register(&ab3100->event_subscribers,
 343                                                nb);
 344 }
 345 EXPORT_SYMBOL(ab3100_event_register);
 346
 347 /*
 348  * Remove a previously registered callback.
 349  */
 350 int ab3100_event_unregister(struct ab3100 *ab3100,
 351                             struct notifier_block *nb)
 352 {
 353   return blocking_notifier_chain_unregister(&ab3100->event_subscribers,
 354                                             nb);
 355 }
 356 EXPORT_SYMBOL(ab3100_event_unregister);
 357
 358
 359 int ab3100_event_registers_startup_state_get(struct ab3100 *ab3100,
 360                                              u32 *fatevent)
 361 {
 362         if (!ab3100->startup_events_read)
 363                 return -EAGAIN; /* Try again later */
 364         *fatevent = ab3100->startup_events;
 365         return 0;
 366 }
 367 EXPORT_SYMBOL(ab3100_event_registers_startup_state_get);
 368
 369 /*
 370  * This is a threaded interrupt handler so we can make some
 371  * I2C calls etc.
 372  */
 373 static irqreturn_t ab3100_irq_handler(int irq, void *data)
 374 {
 375         struct ab3100 *ab3100 = data;
 376         u8 event_regs[3];
 377         u32 fatevent;
 378         int err;
 379
 380         add_interrupt_randomness(irq);
 381
 382         err = ab3100_get_register_page_interruptible(ab3100, AB3100_EVENTA1,
 383                                        event_regs, 3);
 384         if (err)
 385                 goto err_event;
 386
 387         fatevent = (event_regs[0] << 16) |
 388                 (event_regs[1] << 8) |
 389                 event_regs[2];
 390
 391         if (!ab3100->startup_events_read) {
 392                 ab3100->startup_events = fatevent;
 393                 ab3100->startup_events_read = true;
 394         }
 395         /*
 396          * The notified parties will have to mask out the events
 397          * they're interested in and react to them. They will be
 398          * notified on all events, then they use the fatevent value
 399          * to determine if they're interested.
 400          */
 401         blocking_notifier_call_chain(&ab3100->event_subscribers,
 402                                      fatevent, NULL);
 403
 404         dev_dbg(ab3100->dev,
 405                 "IRQ Event: 0x%08x\n", fatevent);
 406
 407         return IRQ_HANDLED;
 408
 409  err_event:
 410         dev_dbg(ab3100->dev,
 411                 "error reading event status\n");
 412         return IRQ_HANDLED;
 413 }
 414
 415 #ifdef CONFIG_DEBUG_FS
 416 /*
 417  * Some debugfs entries only exposed if we're using debug
 418  */
 419 static int ab3100_registers_print(struct seq_file *s, void *p)
 420 {
 421         struct ab3100 *ab3100 = s->private;
 422         u8 value;
 423         u8 reg;
 424
 425         seq_printf(s, "AB3100 registers:\n");
 426
 427         for (reg = 0; reg < 0xff; reg++) {
 428                 ab3100_get_register_interruptible(ab3100, reg, &value);
 429                 seq_printf(s, "[0x%x]:  0x%x\n", reg, value);
 430         }
 431         return 0;
 432 }
 433
 434 static int ab3100_registers_open(struct inode *inode, struct file *file)
 435 {
 436         return single_open(file, ab3100_registers_print, inode->i_private);
 437 }
 438
 439 static const struct file_operations ab3100_registers_fops = {
 440         .open = ab3100_registers_open,
 441         .read = seq_read,
 442         .llseek = seq_lseek,
 443         .release = single_release,
 444         .owner = THIS_MODULE,
 445 };
 446
 447 struct ab3100_get_set_reg_priv {
 448         struct ab3100 *ab3100;
 449         bool mode;
 450 };
 451
 452 static int ab3100_get_set_reg_open_file(struct inode *inode, struct file *file)
 453 {
 454         file->private_data = inode->i_private;
 455         return 0;
 456 }
 457
 458 static ssize_t ab3100_get_set_reg(struct file *file,
 459                                   const char __user *user_buf,
 460                                   size_t count, loff_t *ppos)
 461 {
 462         struct ab3100_get_set_reg_priv *priv = file->private_data;
 463         struct ab3100 *ab3100 = priv->ab3100;
 464         char buf[32];
 465         ssize_t buf_size;
 466         int regp;
 467         unsigned long user_reg;
 468         int err;
 469         int i = 0;
 470
 471         /* Get userspace string and assure termination */
 472         buf_size = min(count, (sizeof(buf)-1));
 473         if (copy_from_user(buf, user_buf, buf_size))
 474                 return -EFAULT;
 475         buf[buf_size] = 0;
 476
 477         /*
 478          * The idea is here to parse a string which is either
 479          * "0xnn" for reading a register, or "0xaa 0xbb" for
 480          * writing 0xbb to the register 0xaa. First move past
 481          * whitespace and then begin to parse the register.
 482          */
 483         while ((i < buf_size) && (buf[i] == ' '))
 484                 i++;
 485         regp = i;
 486
 487         /*
 488          * Advance pointer to end of string then terminate
 489          * the register string. This is needed to satisfy
 490          * the strict_strtoul() function.
 491          */
 492         while ((i < buf_size) && (buf[i] != ' '))
 493                 i++;
 494         buf[i] = '\0';
 495
 496         err = strict_strtoul(&buf[regp], 16, &user_reg);
 497         if (err)
 498                 return err;
 499         if (user_reg > 0xff)
 500                 return -EINVAL;
 501
 502         /* Either we read or we write a register here */
 503         if (!priv->mode) {
 504                 /* Reading */
 505                 u8 reg = (u8) user_reg;
 506                 u8 regvalue;
 507
 508                 ab3100_get_register_interruptible(ab3100, reg, &regvalue);
 509
 510                 dev_info(ab3100->dev,
 511                          "debug read AB3100 reg[0x%02x]: 0x%02x\n",
 512                          reg, regvalue);
 513         } else {
 514                 int valp;
 515                 unsigned long user_value;
 516                 u8 reg = (u8) user_reg;
 517                 u8 value;
 518                 u8 regvalue;
 519
 520                 /*
 521                  * Writing, we need some value to write to
 522                  * the register so keep parsing the string
 523                  * from userspace.
 524                  */
 525                 i++;
 526                 while ((i < buf_size) && (buf[i] == ' '))
 527                         i++;
 528                 valp = i;
 529                 while ((i < buf_size) && (buf[i] != ' '))
 530                         i++;
 531                 buf[i] = '\0';
 532
 533                 err = strict_strtoul(&buf[valp], 16, &user_value);
 534                 if (err)
 535                         return err;
 536                 if (user_reg > 0xff)
 537                         return -EINVAL;
 538
 539                 value = (u8) user_value;
 540                 ab3100_set_register_interruptible(ab3100, reg, value);
 541                 ab3100_get_register_interruptible(ab3100, reg, &regvalue);
 542
 543                 dev_info(ab3100->dev,
 544                          "debug write reg[0x%02x] with 0x%02x, "
 545                          "after readback: 0x%02x\n",
 546                          reg, value, regvalue);
 547         }
 548         return buf_size;
 549 }
 550
 551 static const struct file_operations ab3100_get_set_reg_fops = {
 552         .open = ab3100_get_set_reg_open_file,
 553         .write = ab3100_get_set_reg,
 554 };
 555
 556 static struct dentry *ab3100_dir;
 557 static struct dentry *ab3100_reg_file;
 558 static struct ab3100_get_set_reg_priv ab3100_get_priv;
 559 static struct dentry *ab3100_get_reg_file;
 560 static struct ab3100_get_set_reg_priv ab3100_set_priv;
 561 static struct dentry *ab3100_set_reg_file;
 562
 563 static void ab3100_setup_debugfs(struct ab3100 *ab3100)
 564 {
 565         int err;
 566
 567         ab3100_dir = debugfs_create_dir("ab3100", NULL);
 568         if (!ab3100_dir)
 569                 goto exit_no_debugfs;
 570
 571         ab3100_reg_file = debugfs_create_file("registers",
 572                                 S_IRUGO, ab3100_dir, ab3100,
 573                                 &ab3100_registers_fops);
 574         if (!ab3100_reg_file) {
 575                 err = -ENOMEM;
 576                 goto exit_destroy_dir;
 577         }
 578
 579         ab3100_get_priv.ab3100 = ab3100;
 580         ab3100_get_priv.mode = false;
 581         ab3100_get_reg_file = debugfs_create_file("get_reg",
 582                                 S_IWUGO, ab3100_dir, &ab3100_get_priv,
 583                                 &ab3100_get_set_reg_fops);
 584         if (!ab3100_get_reg_file) {
 585                 err = -ENOMEM;
 586                 goto exit_destroy_reg;
 587         }
 588
 589         ab3100_set_priv.ab3100 = ab3100;
 590         ab3100_set_priv.mode = true;
 591         ab3100_set_reg_file = debugfs_create_file("set_reg",
 592                                 S_IWUGO, ab3100_dir, &ab3100_set_priv,
 593                                 &ab3100_get_set_reg_fops);
 594         if (!ab3100_set_reg_file) {
 595                 err = -ENOMEM;
 596                 goto exit_destroy_get_reg;
 597         }
 598         return;
 599
 600  exit_destroy_get_reg:
 601         debugfs_remove(ab3100_get_reg_file);
 602  exit_destroy_reg:
 603         debugfs_remove(ab3100_reg_file);
 604  exit_destroy_dir:
 605         debugfs_remove(ab3100_dir);
 606  exit_no_debugfs:
 607         return;
 608 }
 609 static inline void ab3100_remove_debugfs(void)
 610 {
 611         debugfs_remove(ab3100_set_reg_file);
 612         debugfs_remove(ab3100_get_reg_file);
 613         debugfs_remove(ab3100_reg_file);
 614         debugfs_remove(ab3100_dir);
 615 }
 616 #else
 617 static inline void ab3100_setup_debugfs(struct ab3100 *ab3100)
 618 {
 619 }
 620 static inline void ab3100_remove_debugfs(void)
 621 {
 622 }
 623 #endif
 624
 625 /*
 626  * Basic set-up, datastructure creation/destruction and I2C interface.
 627  * This sets up a default config in the AB3100 chip so that it
 628  * will work as expected.
 629  */
 630
 631 struct ab3100_init_setting {
 632         u8 abreg;
 633         u8 setting;
 634 };
 635
 636 static const struct ab3100_init_setting __initconst
 637 ab3100_init_settings[] = {
 638         {
 639                 .abreg = AB3100_MCA,
 640                 .setting = 0x01
 641         }, {
 642                 .abreg = AB3100_MCB,
 643                 .setting = 0x30
 644         }, {
 645                 .abreg = AB3100_IMRA1,
 646                 .setting = 0x00
 647         }, {
 648                 .abreg = AB3100_IMRA2,
 649                 .setting = 0xFF
 650         }, {
 651                 .abreg = AB3100_IMRA3,
 652                 .setting = 0x01
 653         }, {
 654                 .abreg = AB3100_IMRB1,
 655                 .setting = 0xBF
 656         }, {
 657                 .abreg = AB3100_IMRB2,
 658                 .setting = 0xFF
 659         }, {
 660                 .abreg = AB3100_IMRB3,
 661                 .setting = 0xFF
 662         }, {
 663                 .abreg = AB3100_SUP,
 664                 .setting = 0x00
 665         }, {
 666                 .abreg = AB3100_DIS,
 667                 .setting = 0xF0
 668         }, {
 669                 .abreg = AB3100_D0C,
 670                 .setting = 0x00
 671         }, {
 672                 .abreg = AB3100_D1C,
 673                 .setting = 0x00
 674         }, {
 675                 .abreg = AB3100_D2C,
 676                 .setting = 0x00
 677         }, {
 678                 .abreg = AB3100_D3C,
 679                 .setting = 0x00
 680         },
 681 };
 682
 683 static int __init ab3100_setup(struct ab3100 *ab3100)
 684 {
 685         int err = 0;
 686         int i;
 687
 688         for (i = 0; i < ARRAY_SIZE(ab3100_init_settings); i++) {
 689                 err = ab3100_set_register_interruptible(ab3100,
 690                                           ab3100_init_settings[i].abreg,
 691                                           ab3100_init_settings[i].setting);
 692                 if (err)
 693                         goto exit_no_setup;
 694         }
 695
 696         /*
 697          * Special trick to make the AB3100 use the 32kHz clock (RTC)
 698          * bit 3 in test register 0x02 is a special, undocumented test
 699          * register bit that only exist in AB3100 P1E
 700          */
 701         if (ab3100->chip_id == 0xc4) {
 702                 dev_warn(ab3100->dev,
 703                          "AB3100 P1E variant detected, "
 704                          "forcing chip to 32KHz\n");
 705                 err = ab3100_set_test_register_interruptible(ab3100, 0x02, 0x08);
 706         }
 707
 708  exit_no_setup:
 709         return err;
 710 }
 711
 712 /*
 713  * Here we define all the platform devices that appear
 714  * as children of the AB3100. These are regular platform
 715  * devices with the IORESOURCE_IO .start and .end set
 716  * to correspond to the internal AB3100 register range
 717  * mapping to the corresponding subdevice.
 718  */
 719
 720 #define AB3100_DEVICE(devname, devid)                           \
 721 static struct platform_device ab3100_##devname##_device = {     \
 722         .name           = devid,                                \
 723         .id             = -1,                                   \
 724 }
 725
 726 /* This lists all the subdevices */
 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         err = request_threaded_irq(client->irq, NULL, ab3100_irq_handler,
 893                                 IRQF_ONESHOT, "ab3100-core", ab3100);
 894         /* This real unpredictable IRQ is of course sampled for entropy */
 895         rand_initialize_irq(client->irq);
 896
 897         if (err)
 898                 goto exit_no_irq;
 899
 900         /* Set parent and a pointer back to the container in device data */
 901         for (i = 0; i < ARRAY_SIZE(ab3100_platform_devs); i++) {
 902                 ab3100_platform_devs[i]->dev.parent =
 903                         &client->dev;
 904                 ab3100_platform_devs[i]->dev.platform_data =
 905                         ab3100_plf_data;
 906                 platform_set_drvdata(ab3100_platform_devs[i], ab3100);
 907         }
 908
 909         /* Register the platform devices */
 910         platform_add_devices(ab3100_platform_devs,
 911                              ARRAY_SIZE(ab3100_platform_devs));
 912
 913         ab3100_setup_debugfs(ab3100);
 914
 915         return 0;
 916
 917  exit_no_irq:
 918  exit_no_setup:
 919         i2c_unregister_device(ab3100->testreg_client);
 920  exit_no_testreg_client:
 921  exit_no_detect:
 922         kfree(ab3100);
 923         return err;
 924 }
 925
 926 static int __exit ab3100_remove(struct i2c_client *client)
 927 {
 928         struct ab3100 *ab3100 = i2c_get_clientdata(client);
 929         int i;
 930
 931         /* Unregister subdevices */
 932         for (i = 0; i < ARRAY_SIZE(ab3100_platform_devs); i++)
 933                 platform_device_unregister(ab3100_platform_devs[i]);
 934
 935         ab3100_remove_debugfs();
 936         i2c_unregister_device(ab3100->testreg_client);
 937
 938         /*
 939          * At this point, all subscribers should have unregistered
 940          * their notifiers so deactivate IRQ
 941          */
 942         free_irq(client->irq, ab3100);
 943         kfree(ab3100);
 944         return 0;
 945 }
 946
 947 static const struct i2c_device_id ab3100_id[] = {
 948         { "ab3100", 0 },
 949         { }
 950 };
 951 MODULE_DEVICE_TABLE(i2c, ab3100_id);
 952
 953 static struct i2c_driver ab3100_driver = {
 954         .driver = {
 955                 .name   = "ab3100",
 956                 .owner  = THIS_MODULE,
 957         },
 958         .id_table       = ab3100_id,
 959         .probe          = ab3100_probe,
 960         .remove         = __exit_p(ab3100_remove),
 961 };
 962
 963 static int __init ab3100_i2c_init(void)
 964 {
 965         return i2c_add_driver(&ab3100_driver);
 966 }
 967
 968 static void __exit ab3100_i2c_exit(void)
 969 {
 970         i2c_del_driver(&ab3100_driver);
 971 }
 972
 973 subsys_initcall(ab3100_i2c_init);
 974 module_exit(ab3100_i2c_exit);
 975
 976 MODULE_AUTHOR("Linus Walleij <linus.walleij@stericsson.com>");
 977 MODULE_DESCRIPTION("AB3100 core driver");
 978 MODULE_LICENSE("GPL");