linux/drivers/mfd/ab3100-core.c
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   1/*
   2 * Copyright (C) 2007-2010 ST-Ericsson
   3 * License terms: GNU General Public License (GPL) version 2
   4 * Low-level core for exclusive access to the AB3100 IC on the I2C bus
   5 * and some basic chip-configuration.
   6 * Author: Linus Walleij <linus.walleij@stericsson.com>
   7 */
   8
   9#include <linux/i2c.h>
  10#include <linux/mutex.h>
  11#include <linux/list.h>
  12#include <linux/notifier.h>
  13#include <linux/slab.h>
  14#include <linux/err.h>
  15#include <linux/platform_device.h>
  16#include <linux/device.h>
  17#include <linux/interrupt.h>
  18#include <linux/random.h>
  19#include <linux/debugfs.h>
  20#include <linux/seq_file.h>
  21#include <linux/uaccess.h>
  22#include <linux/mfd/core.h>
  23#include <linux/mfd/abx500.h>
  24
  25/* These are the only registers inside AB3100 used in this main file */
  26
  27/* Interrupt event registers */
  28#define AB3100_EVENTA1          0x21
  29#define AB3100_EVENTA2          0x22
  30#define AB3100_EVENTA3          0x23
  31
  32/* AB3100 DAC converter registers */
  33#define AB3100_DIS              0x00
  34#define AB3100_D0C              0x01
  35#define AB3100_D1C              0x02
  36#define AB3100_D2C              0x03
  37#define AB3100_D3C              0x04
  38
  39/* Chip ID register */
  40#define AB3100_CID              0x20
  41
  42/* AB3100 interrupt registers */
  43#define AB3100_IMRA1            0x24
  44#define AB3100_IMRA2            0x25
  45#define AB3100_IMRA3            0x26
  46#define AB3100_IMRB1            0x2B
  47#define AB3100_IMRB2            0x2C
  48#define AB3100_IMRB3            0x2D
  49
  50/* System Power Monitoring and control registers */
  51#define AB3100_MCA              0x2E
  52#define AB3100_MCB              0x2F
  53
  54/* SIM power up */
  55#define AB3100_SUP              0x50
  56
  57/*
  58 * I2C communication
  59 *
  60 * The AB3100 is usually assigned address 0x48 (7-bit)
  61 * The chip is defined in the platform i2c_board_data section.
  62 */
  63static int ab3100_get_chip_id(struct device *dev)
  64{
  65        struct ab3100 *ab3100 = dev_get_drvdata(dev->parent);
  66
  67        return (int)ab3100->chip_id;
  68}
  69
  70static int ab3100_set_register_interruptible(struct ab3100 *ab3100,
  71        u8 reg, u8 regval)
  72{
  73        u8 regandval[2] = {reg, regval};
  74        int err;
  75
  76        err = mutex_lock_interruptible(&ab3100->access_mutex);
  77        if (err)
  78                return err;
  79
  80        /*
  81         * A two-byte write message with the first byte containing the register
  82         * number and the second byte containing the value to be written
  83         * effectively sets a register in the AB3100.
  84         */
  85        err = i2c_master_send(ab3100->i2c_client, regandval, 2);
  86        if (err < 0) {
  87                dev_err(ab3100->dev,
  88                        "write error (write register): %d\n",
  89                        err);
  90        } else if (err != 2) {
  91                dev_err(ab3100->dev,
  92                        "write error (write register) "
  93                        "%d bytes transferred (expected 2)\n",
  94                        err);
  95                err = -EIO;
  96        } else {
  97                /* All is well */
  98                err = 0;
  99        }
 100        mutex_unlock(&ab3100->access_mutex);
 101        return err;
 102}
 103
 104static int set_register_interruptible(struct device *dev,
 105        u8 bank, u8 reg, u8 value)
 106{
 107        struct ab3100 *ab3100 = dev_get_drvdata(dev->parent);
 108
 109        return ab3100_set_register_interruptible(ab3100, reg, value);
 110}
 111
 112/*
 113 * The test registers exist at an I2C bus address up one
 114 * from the ordinary base. They are not supposed to be used
 115 * in production code, but sometimes you have to do that
 116 * anyway. It's currently only used from this file so declare
 117 * it static and do not export.
 118 */
 119static 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
 149static int ab3100_get_register_interruptible(struct ab3100 *ab3100,
 150                                             u8 reg, u8 *regval)
 151{
 152        int err;
 153
 154        err = mutex_lock_interruptible(&ab3100->access_mutex);
 155        if (err)
 156                return err;
 157
 158        /*
 159         * AB3100 require an I2C "stop" command between each message, else
 160         * it will not work. The only way of achieveing this with the
 161         * message transport layer is to send the read and write messages
 162         * separately.
 163         */
 164        err = i2c_master_send(ab3100->i2c_client, &reg, 1);
 165        if (err < 0) {
 166                dev_err(ab3100->dev,
 167                        "write error (send register address): %d\n",
 168                        err);
 169                goto get_reg_out_unlock;
 170        } else if (err != 1) {
 171                dev_err(ab3100->dev,
 172                        "write error (send register address) "
 173                        "%d bytes transferred (expected 1)\n",
 174                        err);
 175                err = -EIO;
 176                goto get_reg_out_unlock;
 177        } else {
 178                /* All is well */
 179                err = 0;
 180        }
 181
 182        err = i2c_master_recv(ab3100->i2c_client, regval, 1);
 183        if (err < 0) {
 184                dev_err(ab3100->dev,
 185                        "write error (read register): %d\n",
 186                        err);
 187                goto get_reg_out_unlock;
 188        } else if (err != 1) {
 189                dev_err(ab3100->dev,
 190                        "write error (read register) "
 191                        "%d bytes transferred (expected 1)\n",
 192                        err);
 193                err = -EIO;
 194                goto get_reg_out_unlock;
 195        } else {
 196                /* All is well */
 197                err = 0;
 198        }
 199
 200 get_reg_out_unlock:
 201        mutex_unlock(&ab3100->access_mutex);
 202        return err;
 203}
 204
 205static int get_register_interruptible(struct device *dev, u8 bank, u8 reg,
 206                                      u8 *value)
 207{
 208        struct ab3100 *ab3100 = dev_get_drvdata(dev->parent);
 209
 210        return ab3100_get_register_interruptible(ab3100, reg, value);
 211}
 212
 213static int ab3100_get_register_page_interruptible(struct ab3100 *ab3100,
 214                             u8 first_reg, u8 *regvals, u8 numregs)
 215{
 216        int err;
 217
 218        if (ab3100->chip_id == 0xa0 ||
 219            ab3100->chip_id == 0xa1)
 220                /* These don't support paged reads */
 221                return -EIO;
 222
 223        err = mutex_lock_interruptible(&ab3100->access_mutex);
 224        if (err)
 225                return err;
 226
 227        /*
 228         * Paged read also require an I2C "stop" command.
 229         */
 230        err = i2c_master_send(ab3100->i2c_client, &first_reg, 1);
 231        if (err < 0) {
 232                dev_err(ab3100->dev,
 233                        "write error (send first register address): %d\n",
 234                        err);
 235                goto get_reg_page_out_unlock;
 236        } else if (err != 1) {
 237                dev_err(ab3100->dev,
 238                        "write error (send first register address) "
 239                        "%d bytes transferred (expected 1)\n",
 240                        err);
 241                err = -EIO;
 242                goto get_reg_page_out_unlock;
 243        }
 244
 245        err = i2c_master_recv(ab3100->i2c_client, regvals, numregs);
 246        if (err < 0) {
 247                dev_err(ab3100->dev,
 248                        "write error (read register page): %d\n",
 249                        err);
 250                goto get_reg_page_out_unlock;
 251        } else if (err != numregs) {
 252                dev_err(ab3100->dev,
 253                        "write error (read register page) "
 254                        "%d bytes transferred (expected %d)\n",
 255                        err, numregs);
 256                err = -EIO;
 257                goto get_reg_page_out_unlock;
 258        }
 259
 260        /* All is well */
 261        err = 0;
 262
 263 get_reg_page_out_unlock:
 264        mutex_unlock(&ab3100->access_mutex);
 265        return err;
 266}
 267
 268static int get_register_page_interruptible(struct device *dev, u8 bank,
 269        u8 first_reg, u8 *regvals, u8 numregs)
 270{
 271        struct ab3100 *ab3100 = dev_get_drvdata(dev->parent);
 272
 273        return ab3100_get_register_page_interruptible(ab3100,
 274                        first_reg, regvals, numregs);
 275}
 276
 277static int ab3100_mask_and_set_register_interruptible(struct ab3100 *ab3100,
 278                                 u8 reg, u8 andmask, u8 ormask)
 279{
 280        u8 regandval[2] = {reg, 0};
 281        int err;
 282
 283        err = mutex_lock_interruptible(&ab3100->access_mutex);
 284        if (err)
 285                return err;
 286
 287        /* First read out the target register */
 288        err = i2c_master_send(ab3100->i2c_client, &reg, 1);
 289        if (err < 0) {
 290                dev_err(ab3100->dev,
 291                        "write error (maskset send address): %d\n",
 292                        err);
 293                goto get_maskset_unlock;
 294        } else if (err != 1) {
 295                dev_err(ab3100->dev,
 296                        "write error (maskset send address) "
 297                        "%d bytes transferred (expected 1)\n",
 298                        err);
 299                err = -EIO;
 300                goto get_maskset_unlock;
 301        }
 302
 303        err = i2c_master_recv(ab3100->i2c_client, &regandval[1], 1);
 304        if (err < 0) {
 305                dev_err(ab3100->dev,
 306                        "write error (maskset read register): %d\n",
 307                        err);
 308                goto get_maskset_unlock;
 309        } else if (err != 1) {
 310                dev_err(ab3100->dev,
 311                        "write error (maskset read register) "
 312                        "%d bytes transferred (expected 1)\n",
 313                        err);
 314                err = -EIO;
 315                goto get_maskset_unlock;
 316        }
 317
 318        /* Modify the register */
 319        regandval[1] &= andmask;
 320        regandval[1] |= ormask;
 321
 322        /* Write the register */
 323        err = i2c_master_send(ab3100->i2c_client, regandval, 2);
 324        if (err < 0) {
 325                dev_err(ab3100->dev,
 326                        "write error (write register): %d\n",
 327                        err);
 328                goto get_maskset_unlock;
 329        } else if (err != 2) {
 330                dev_err(ab3100->dev,
 331                        "write error (write register) "
 332                        "%d bytes transferred (expected 2)\n",
 333                        err);
 334                err = -EIO;
 335                goto get_maskset_unlock;
 336        }
 337
 338        /* All is well */
 339        err = 0;
 340
 341 get_maskset_unlock:
 342        mutex_unlock(&ab3100->access_mutex);
 343        return err;
 344}
 345
 346static int mask_and_set_register_interruptible(struct device *dev, u8 bank,
 347        u8 reg, u8 bitmask, u8 bitvalues)
 348{
 349        struct ab3100 *ab3100 = dev_get_drvdata(dev->parent);
 350
 351        return ab3100_mask_and_set_register_interruptible(ab3100,
 352                        reg, bitmask, (bitmask & bitvalues));
 353}
 354
 355/*
 356 * Register a simple callback for handling any AB3100 events.
 357 */
 358int ab3100_event_register(struct ab3100 *ab3100,
 359                          struct notifier_block *nb)
 360{
 361        return blocking_notifier_chain_register(&ab3100->event_subscribers,
 362                                               nb);
 363}
 364EXPORT_SYMBOL(ab3100_event_register);
 365
 366/*
 367 * Remove a previously registered callback.
 368 */
 369int ab3100_event_unregister(struct ab3100 *ab3100,
 370                            struct notifier_block *nb)
 371{
 372  return blocking_notifier_chain_unregister(&ab3100->event_subscribers,
 373                                            nb);
 374}
 375EXPORT_SYMBOL(ab3100_event_unregister);
 376
 377
 378static int ab3100_event_registers_startup_state_get(struct device *dev,
 379                                             u8 *event)
 380{
 381        struct ab3100 *ab3100 = dev_get_drvdata(dev->parent);
 382        if (!ab3100->startup_events_read)
 383                return -EAGAIN; /* Try again later */
 384        memcpy(event, ab3100->startup_events, 3);
 385        return 0;
 386}
 387
 388static struct abx500_ops ab3100_ops = {
 389        .get_chip_id = ab3100_get_chip_id,
 390        .set_register = set_register_interruptible,
 391        .get_register = get_register_interruptible,
 392        .get_register_page = get_register_page_interruptible,
 393        .set_register_page = NULL,
 394        .mask_and_set_register = mask_and_set_register_interruptible,
 395        .event_registers_startup_state_get =
 396                ab3100_event_registers_startup_state_get,
 397        .startup_irq_enabled = NULL,
 398};
 399
 400/*
 401 * This is a threaded interrupt handler so we can make some
 402 * I2C calls etc.
 403 */
 404static irqreturn_t ab3100_irq_handler(int irq, void *data)
 405{
 406        struct ab3100 *ab3100 = data;
 407        u8 event_regs[3];
 408        u32 fatevent;
 409        int err;
 410
 411        add_interrupt_randomness(irq);
 412
 413        err = ab3100_get_register_page_interruptible(ab3100, AB3100_EVENTA1,
 414                                       event_regs, 3);
 415        if (err)
 416                goto err_event;
 417
 418        fatevent = (event_regs[0] << 16) |
 419                (event_regs[1] << 8) |
 420                event_regs[2];
 421
 422        if (!ab3100->startup_events_read) {
 423                ab3100->startup_events[0] = event_regs[0];
 424                ab3100->startup_events[1] = event_regs[1];
 425                ab3100->startup_events[2] = event_regs[2];
 426                ab3100->startup_events_read = true;
 427        }
 428        /*
 429         * The notified parties will have to mask out the events
 430         * they're interested in and react to them. They will be
 431         * notified on all events, then they use the fatevent value
 432         * to determine if they're interested.
 433         */
 434        blocking_notifier_call_chain(&ab3100->event_subscribers,
 435                                     fatevent, NULL);
 436
 437        dev_dbg(ab3100->dev,
 438                "IRQ Event: 0x%08x\n", fatevent);
 439
 440        return IRQ_HANDLED;
 441
 442 err_event:
 443        dev_dbg(ab3100->dev,
 444                "error reading event status\n");
 445        return IRQ_HANDLED;
 446}
 447
 448#ifdef CONFIG_DEBUG_FS
 449/*
 450 * Some debugfs entries only exposed if we're using debug
 451 */
 452static int ab3100_registers_print(struct seq_file *s, void *p)
 453{
 454        struct ab3100 *ab3100 = s->private;
 455        u8 value;
 456        u8 reg;
 457
 458        seq_printf(s, "AB3100 registers:\n");
 459
 460        for (reg = 0; reg < 0xff; reg++) {
 461                ab3100_get_register_interruptible(ab3100, reg, &value);
 462                seq_printf(s, "[0x%x]:  0x%x\n", reg, value);
 463        }
 464        return 0;
 465}
 466
 467static int ab3100_registers_open(struct inode *inode, struct file *file)
 468{
 469        return single_open(file, ab3100_registers_print, inode->i_private);
 470}
 471
 472static const struct file_operations ab3100_registers_fops = {
 473        .open = ab3100_registers_open,
 474        .read = seq_read,
 475        .llseek = seq_lseek,
 476        .release = single_release,
 477        .owner = THIS_MODULE,
 478};
 479
 480struct ab3100_get_set_reg_priv {
 481        struct ab3100 *ab3100;
 482        bool mode;
 483};
 484
 485static int ab3100_get_set_reg_open_file(struct inode *inode, struct file *file)
 486{
 487        file->private_data = inode->i_private;
 488        return 0;
 489}
 490
 491static ssize_t ab3100_get_set_reg(struct file *file,
 492                                  const char __user *user_buf,
 493                                  size_t count, loff_t *ppos)
 494{
 495        struct ab3100_get_set_reg_priv *priv = file->private_data;
 496        struct ab3100 *ab3100 = priv->ab3100;
 497        char buf[32];
 498        ssize_t buf_size;
 499        int regp;
 500        unsigned long user_reg;
 501        int err;
 502        int i = 0;
 503
 504        /* Get userspace string and assure termination */
 505        buf_size = min(count, (sizeof(buf)-1));
 506        if (copy_from_user(buf, user_buf, buf_size))
 507                return -EFAULT;
 508        buf[buf_size] = 0;
 509
 510        /*
 511         * The idea is here to parse a string which is either
 512         * "0xnn" for reading a register, or "0xaa 0xbb" for
 513         * writing 0xbb to the register 0xaa. First move past
 514         * whitespace and then begin to parse the register.
 515         */
 516        while ((i < buf_size) && (buf[i] == ' '))
 517                i++;
 518        regp = i;
 519
 520        /*
 521         * Advance pointer to end of string then terminate
 522         * the register string. This is needed to satisfy
 523         * the strict_strtoul() function.
 524         */
 525        while ((i < buf_size) && (buf[i] != ' '))
 526                i++;
 527        buf[i] = '\0';
 528
 529        err = strict_strtoul(&buf[regp], 16, &user_reg);
 530        if (err)
 531                return err;
 532        if (user_reg > 0xff)
 533                return -EINVAL;
 534
 535        /* Either we read or we write a register here */
 536        if (!priv->mode) {
 537                /* Reading */
 538                u8 reg = (u8) user_reg;
 539                u8 regvalue;
 540
 541                ab3100_get_register_interruptible(ab3100, reg, &regvalue);
 542
 543                dev_info(ab3100->dev,
 544                         "debug read AB3100 reg[0x%02x]: 0x%02x\n",
 545                         reg, regvalue);
 546        } else {
 547                int valp;
 548                unsigned long user_value;
 549                u8 reg = (u8) user_reg;
 550                u8 value;
 551                u8 regvalue;
 552
 553                /*
 554                 * Writing, we need some value to write to
 555                 * the register so keep parsing the string
 556                 * from userspace.
 557                 */
 558                i++;
 559                while ((i < buf_size) && (buf[i] == ' '))
 560                        i++;
 561                valp = i;
 562                while ((i < buf_size) && (buf[i] != ' '))
 563                        i++;
 564                buf[i] = '\0';
 565
 566                err = strict_strtoul(&buf[valp], 16, &user_value);
 567                if (err)
 568                        return err;
 569                if (user_reg > 0xff)
 570                        return -EINVAL;
 571
 572                value = (u8) user_value;
 573                ab3100_set_register_interruptible(ab3100, reg, value);
 574                ab3100_get_register_interruptible(ab3100, reg, &regvalue);
 575
 576                dev_info(ab3100->dev,
 577                         "debug write reg[0x%02x] with 0x%02x, "
 578                         "after readback: 0x%02x\n",
 579                         reg, value, regvalue);
 580        }
 581        return buf_size;
 582}
 583
 584static const struct file_operations ab3100_get_set_reg_fops = {
 585        .open = ab3100_get_set_reg_open_file,
 586        .write = ab3100_get_set_reg,
 587        .llseek = noop_llseek,
 588};
 589
 590static struct dentry *ab3100_dir;
 591static struct dentry *ab3100_reg_file;
 592static struct ab3100_get_set_reg_priv ab3100_get_priv;
 593static struct dentry *ab3100_get_reg_file;
 594static struct ab3100_get_set_reg_priv ab3100_set_priv;
 595static struct dentry *ab3100_set_reg_file;
 596
 597static void ab3100_setup_debugfs(struct ab3100 *ab3100)
 598{
 599        int err;
 600
 601        ab3100_dir = debugfs_create_dir("ab3100", NULL);
 602        if (!ab3100_dir)
 603                goto exit_no_debugfs;
 604
 605        ab3100_reg_file = debugfs_create_file("registers",
 606                                S_IRUGO, ab3100_dir, ab3100,
 607                                &ab3100_registers_fops);
 608        if (!ab3100_reg_file) {
 609                err = -ENOMEM;
 610                goto exit_destroy_dir;
 611        }
 612
 613        ab3100_get_priv.ab3100 = ab3100;
 614        ab3100_get_priv.mode = false;
 615        ab3100_get_reg_file = debugfs_create_file("get_reg",
 616                                S_IWUSR, ab3100_dir, &ab3100_get_priv,
 617                                &ab3100_get_set_reg_fops);
 618        if (!ab3100_get_reg_file) {
 619                err = -ENOMEM;
 620                goto exit_destroy_reg;
 621        }
 622
 623        ab3100_set_priv.ab3100 = ab3100;
 624        ab3100_set_priv.mode = true;
 625        ab3100_set_reg_file = debugfs_create_file("set_reg",
 626                                S_IWUSR, ab3100_dir, &ab3100_set_priv,
 627                                &ab3100_get_set_reg_fops);
 628        if (!ab3100_set_reg_file) {
 629                err = -ENOMEM;
 630                goto exit_destroy_get_reg;
 631        }
 632        return;
 633
 634 exit_destroy_get_reg:
 635        debugfs_remove(ab3100_get_reg_file);
 636 exit_destroy_reg:
 637        debugfs_remove(ab3100_reg_file);
 638 exit_destroy_dir:
 639        debugfs_remove(ab3100_dir);
 640 exit_no_debugfs:
 641        return;
 642}
 643static inline void ab3100_remove_debugfs(void)
 644{
 645        debugfs_remove(ab3100_set_reg_file);
 646        debugfs_remove(ab3100_get_reg_file);
 647        debugfs_remove(ab3100_reg_file);
 648        debugfs_remove(ab3100_dir);
 649}
 650#else
 651static inline void ab3100_setup_debugfs(struct ab3100 *ab3100)
 652{
 653}
 654static inline void ab3100_remove_debugfs(void)
 655{
 656}
 657#endif
 658
 659/*
 660 * Basic set-up, datastructure creation/destruction and I2C interface.
 661 * This sets up a default config in the AB3100 chip so that it
 662 * will work as expected.
 663 */
 664
 665struct ab3100_init_setting {
 666        u8 abreg;
 667        u8 setting;
 668};
 669
 670static const struct ab3100_init_setting __devinitconst
 671ab3100_init_settings[] = {
 672        {
 673                .abreg = AB3100_MCA,
 674                .setting = 0x01
 675        }, {
 676                .abreg = AB3100_MCB,
 677                .setting = 0x30
 678        }, {
 679                .abreg = AB3100_IMRA1,
 680                .setting = 0x00
 681        }, {
 682                .abreg = AB3100_IMRA2,
 683                .setting = 0xFF
 684        }, {
 685                .abreg = AB3100_IMRA3,
 686                .setting = 0x01
 687        }, {
 688                .abreg = AB3100_IMRB1,
 689                .setting = 0xBF
 690        }, {
 691                .abreg = AB3100_IMRB2,
 692                .setting = 0xFF
 693        }, {
 694                .abreg = AB3100_IMRB3,
 695                .setting = 0xFF
 696        }, {
 697                .abreg = AB3100_SUP,
 698                .setting = 0x00
 699        }, {
 700                .abreg = AB3100_DIS,
 701                .setting = 0xF0
 702        }, {
 703                .abreg = AB3100_D0C,
 704                .setting = 0x00
 705        }, {
 706                .abreg = AB3100_D1C,
 707                .setting = 0x00
 708        }, {
 709                .abreg = AB3100_D2C,
 710                .setting = 0x00
 711        }, {
 712                .abreg = AB3100_D3C,
 713                .setting = 0x00
 714        },
 715};
 716
 717static int __devinit ab3100_setup(struct ab3100 *ab3100)
 718{
 719        int err = 0;
 720        int i;
 721
 722        for (i = 0; i < ARRAY_SIZE(ab3100_init_settings); i++) {
 723                err = ab3100_set_register_interruptible(ab3100,
 724                                          ab3100_init_settings[i].abreg,
 725                                          ab3100_init_settings[i].setting);
 726                if (err)
 727                        goto exit_no_setup;
 728        }
 729
 730        /*
 731         * Special trick to make the AB3100 use the 32kHz clock (RTC)
 732         * bit 3 in test register 0x02 is a special, undocumented test
 733         * register bit that only exist in AB3100 P1E
 734         */
 735        if (ab3100->chip_id == 0xc4) {
 736                dev_warn(ab3100->dev,
 737                         "AB3100 P1E variant detected, "
 738                         "forcing chip to 32KHz\n");
 739                err = ab3100_set_test_register_interruptible(ab3100,
 740                        0x02, 0x08);
 741        }
 742
 743 exit_no_setup:
 744        return err;
 745}
 746
 747/* The subdevices of the AB3100 */
 748static struct mfd_cell ab3100_devs[] = {
 749        {
 750                .name = "ab3100-dac",
 751                .id = -1,
 752        },
 753        {
 754                .name = "ab3100-leds",
 755                .id = -1,
 756        },
 757        {
 758                .name = "ab3100-power",
 759                .id = -1,
 760        },
 761        {
 762                .name = "ab3100-regulators",
 763                .id = -1,
 764        },
 765        {
 766                .name = "ab3100-sim",
 767                .id = -1,
 768        },
 769        {
 770                .name = "ab3100-uart",
 771                .id = -1,
 772        },
 773        {
 774                .name = "ab3100-rtc",
 775                .id = -1,
 776        },
 777        {
 778                .name = "ab3100-charger",
 779                .id = -1,
 780        },
 781        {
 782                .name = "ab3100-boost",
 783                .id = -1,
 784        },
 785        {
 786                .name = "ab3100-adc",
 787                .id = -1,
 788        },
 789        {
 790                .name = "ab3100-fuelgauge",
 791                .id = -1,
 792        },
 793        {
 794                .name = "ab3100-vibrator",
 795                .id = -1,
 796        },
 797        {
 798                .name = "ab3100-otp",
 799                .id = -1,
 800        },
 801        {
 802                .name = "ab3100-codec",
 803                .id = -1,
 804        },
 805};
 806
 807struct ab_family_id {
 808        u8      id;
 809        char    *name;
 810};
 811
 812static const struct ab_family_id ids[] __devinitdata = {
 813        /* AB3100 */
 814        {
 815                .id = 0xc0,
 816                .name = "P1A"
 817        }, {
 818                .id = 0xc1,
 819                .name = "P1B"
 820        }, {
 821                .id = 0xc2,
 822                .name = "P1C"
 823        }, {
 824                .id = 0xc3,
 825                .name = "P1D"
 826        }, {
 827                .id = 0xc4,
 828                .name = "P1E"
 829        }, {
 830                .id = 0xc5,
 831                .name = "P1F/R1A"
 832        }, {
 833                .id = 0xc6,
 834                .name = "P1G/R1A"
 835        }, {
 836                .id = 0xc7,
 837                .name = "P2A/R2A"
 838        }, {
 839                .id = 0xc8,
 840                .name = "P2B/R2B"
 841        },
 842        /* AB3000 variants, not supported */
 843        {
 844                .id = 0xa0
 845        }, {
 846                .id = 0xa1
 847        }, {
 848                .id = 0xa2
 849        }, {
 850                .id = 0xa3
 851        }, {
 852                .id = 0xa4
 853        }, {
 854                .id = 0xa5
 855        }, {
 856                .id = 0xa6
 857        }, {
 858                .id = 0xa7
 859        },
 860        /* Terminator */
 861        {
 862                .id = 0x00,
 863        },
 864};
 865
 866static int __devinit ab3100_probe(struct i2c_client *client,
 867                                  const struct i2c_device_id *id)
 868{
 869        struct ab3100 *ab3100;
 870        struct ab3100_platform_data *ab3100_plf_data =
 871                client->dev.platform_data;
 872        int err;
 873        int i;
 874
 875        ab3100 = kzalloc(sizeof(struct ab3100), GFP_KERNEL);
 876        if (!ab3100) {
 877                dev_err(&client->dev, "could not allocate AB3100 device\n");
 878                return -ENOMEM;
 879        }
 880
 881        /* Initialize data structure */
 882        mutex_init(&ab3100->access_mutex);
 883        BLOCKING_INIT_NOTIFIER_HEAD(&ab3100->event_subscribers);
 884
 885        ab3100->i2c_client = client;
 886        ab3100->dev = &ab3100->i2c_client->dev;
 887
 888        i2c_set_clientdata(client, ab3100);
 889
 890        /* Read chip ID register */
 891        err = ab3100_get_register_interruptible(ab3100, AB3100_CID,
 892                                                &ab3100->chip_id);
 893        if (err) {
 894                dev_err(&client->dev,
 895                        "could not communicate with the AB3100 analog "
 896                        "baseband chip\n");
 897                goto exit_no_detect;
 898        }
 899
 900        for (i = 0; ids[i].id != 0x0; i++) {
 901                if (ids[i].id == ab3100->chip_id) {
 902                        if (ids[i].name != NULL) {
 903                                snprintf(&ab3100->chip_name[0],
 904                                         sizeof(ab3100->chip_name) - 1,
 905                                         "AB3100 %s",
 906                                         ids[i].name);
 907                                break;
 908                        } else {
 909                                dev_err(&client->dev,
 910                                        "AB3000 is not supported\n");
 911                                goto exit_no_detect;
 912                        }
 913                }
 914        }
 915
 916        if (ids[i].id == 0x0) {
 917                dev_err(&client->dev, "unknown analog baseband chip id: 0x%x\n",
 918                        ab3100->chip_id);
 919                dev_err(&client->dev, "accepting it anyway. Please update "
 920                        "the driver.\n");
 921                goto exit_no_detect;
 922        }
 923
 924        dev_info(&client->dev, "Detected chip: %s\n",
 925                 &ab3100->chip_name[0]);
 926
 927        /* Attach a second dummy i2c_client to the test register address */
 928        ab3100->testreg_client = i2c_new_dummy(client->adapter,
 929                                                     client->addr + 1);
 930        if (!ab3100->testreg_client) {
 931                err = -ENOMEM;
 932                goto exit_no_testreg_client;
 933        }
 934
 935        err = ab3100_setup(ab3100);
 936        if (err)
 937                goto exit_no_setup;
 938
 939        err = request_threaded_irq(client->irq, NULL, ab3100_irq_handler,
 940                                IRQF_ONESHOT, "ab3100-core", ab3100);
 941        /* This real unpredictable IRQ is of course sampled for entropy */
 942        rand_initialize_irq(client->irq);
 943
 944        if (err)
 945                goto exit_no_irq;
 946
 947        err = abx500_register_ops(&client->dev, &ab3100_ops);
 948        if (err)
 949                goto exit_no_ops;
 950
 951        /* Set up and register the platform devices. */
 952        for (i = 0; i < ARRAY_SIZE(ab3100_devs); i++)
 953                ab3100_devs[i].mfd_data = ab3100_plf_data;
 954
 955        err = mfd_add_devices(&client->dev, 0, ab3100_devs,
 956                ARRAY_SIZE(ab3100_devs), NULL, 0);
 957
 958        ab3100_setup_debugfs(ab3100);
 959
 960        return 0;
 961
 962 exit_no_ops:
 963 exit_no_irq:
 964 exit_no_setup:
 965        i2c_unregister_device(ab3100->testreg_client);
 966 exit_no_testreg_client:
 967 exit_no_detect:
 968        kfree(ab3100);
 969        return err;
 970}
 971
 972static int __devexit ab3100_remove(struct i2c_client *client)
 973{
 974        struct ab3100 *ab3100 = i2c_get_clientdata(client);
 975
 976        /* Unregister subdevices */
 977        mfd_remove_devices(&client->dev);
 978
 979        ab3100_remove_debugfs();
 980        i2c_unregister_device(ab3100->testreg_client);
 981
 982        /*
 983         * At this point, all subscribers should have unregistered
 984         * their notifiers so deactivate IRQ
 985         */
 986        free_irq(client->irq, ab3100);
 987        kfree(ab3100);
 988        return 0;
 989}
 990
 991static const struct i2c_device_id ab3100_id[] = {
 992        { "ab3100", 0 },
 993        { }
 994};
 995MODULE_DEVICE_TABLE(i2c, ab3100_id);
 996
 997static struct i2c_driver ab3100_driver = {
 998        .driver = {
 999                .name   = "ab3100",
1000                .owner  = THIS_MODULE,
1001        },
1002        .id_table       = ab3100_id,
1003        .probe          = ab3100_probe,
1004        .remove         = __devexit_p(ab3100_remove),
1005};
1006
1007static int __init ab3100_i2c_init(void)
1008{
1009        return i2c_add_driver(&ab3100_driver);
1010}
1011
1012static void __exit ab3100_i2c_exit(void)
1013{
1014        i2c_del_driver(&ab3100_driver);
1015}
1016
1017subsys_initcall(ab3100_i2c_init);
1018module_exit(ab3100_i2c_exit);
1019
1020MODULE_AUTHOR("Linus Walleij <linus.walleij@stericsson.com>");
1021MODULE_DESCRIPTION("AB3100 core driver");
1022MODULE_LICENSE("GPL");
1023