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/module.h>
  16#include <linux/platform_device.h>
  17#include <linux/device.h>
  18#include <linux/interrupt.h>
  19#include <linux/random.h>
  20#include <linux/debugfs.h>
  21#include <linux/seq_file.h>
  22#include <linux/uaccess.h>
  23#include <linux/mfd/core.h>
  24#include <linux/mfd/ab3100.h>
  25#include <linux/mfd/abx500.h>
  26
  27/* These are the only registers inside AB3100 used in this main file */
  28
  29/* Interrupt event registers */
  30#define AB3100_EVENTA1          0x21
  31#define AB3100_EVENTA2          0x22
  32#define AB3100_EVENTA3          0x23
  33
  34/* AB3100 DAC converter registers */
  35#define AB3100_DIS              0x00
  36#define AB3100_D0C              0x01
  37#define AB3100_D1C              0x02
  38#define AB3100_D2C              0x03
  39#define AB3100_D3C              0x04
  40
  41/* Chip ID register */
  42#define AB3100_CID              0x20
  43
  44/* AB3100 interrupt registers */
  45#define AB3100_IMRA1            0x24
  46#define AB3100_IMRA2            0x25
  47#define AB3100_IMRA3            0x26
  48#define AB3100_IMRB1            0x2B
  49#define AB3100_IMRB2            0x2C
  50#define AB3100_IMRB3            0x2D
  51
  52/* System Power Monitoring and control registers */
  53#define AB3100_MCA              0x2E
  54#define AB3100_MCB              0x2F
  55
  56/* SIM power up */
  57#define AB3100_SUP              0x50
  58
  59/*
  60 * I2C communication
  61 *
  62 * The AB3100 is usually assigned address 0x48 (7-bit)
  63 * The chip is defined in the platform i2c_board_data section.
  64 */
  65static int ab3100_get_chip_id(struct device *dev)
  66{
  67        struct ab3100 *ab3100 = dev_get_drvdata(dev->parent);
  68
  69        return (int)ab3100->chip_id;
  70}
  71
  72static int ab3100_set_register_interruptible(struct ab3100 *ab3100,
  73        u8 reg, u8 regval)
  74{
  75        u8 regandval[2] = {reg, regval};
  76        int err;
  77
  78        err = mutex_lock_interruptible(&ab3100->access_mutex);
  79        if (err)
  80                return err;
  81
  82        /*
  83         * A two-byte write message with the first byte containing the register
  84         * number and the second byte containing the value to be written
  85         * effectively sets a register in the AB3100.
  86         */
  87        err = i2c_master_send(ab3100->i2c_client, regandval, 2);
  88        if (err < 0) {
  89                dev_err(ab3100->dev,
  90                        "write error (write register): %d\n",
  91                        err);
  92        } else if (err != 2) {
  93                dev_err(ab3100->dev,
  94                        "write error (write register) "
  95                        "%d bytes transferred (expected 2)\n",
  96                        err);
  97                err = -EIO;
  98        } else {
  99                /* All is well */
 100                err = 0;
 101        }
 102        mutex_unlock(&ab3100->access_mutex);
 103        return err;
 104}
 105
 106static int set_register_interruptible(struct device *dev,
 107        u8 bank, u8 reg, u8 value)
 108{
 109        struct ab3100 *ab3100 = dev_get_drvdata(dev->parent);
 110
 111        return ab3100_set_register_interruptible(ab3100, reg, value);
 112}
 113
 114/*
 115 * The test registers exist at an I2C bus address up one
 116 * from the ordinary base. They are not supposed to be used
 117 * in production code, but sometimes you have to do that
 118 * anyway. It's currently only used from this file so declare
 119 * it static and do not export.
 120 */
 121static int ab3100_set_test_register_interruptible(struct ab3100 *ab3100,
 122                                    u8 reg, u8 regval)
 123{
 124        u8 regandval[2] = {reg, regval};
 125        int err;
 126
 127        err = mutex_lock_interruptible(&ab3100->access_mutex);
 128        if (err)
 129                return err;
 130
 131        err = i2c_master_send(ab3100->testreg_client, regandval, 2);
 132        if (err < 0) {
 133                dev_err(ab3100->dev,
 134                        "write error (write test register): %d\n",
 135                        err);
 136        } else if (err != 2) {
 137                dev_err(ab3100->dev,
 138                        "write error (write test register) "
 139                        "%d bytes transferred (expected 2)\n",
 140                        err);
 141                err = -EIO;
 142        } else {
 143                /* All is well */
 144                err = 0;
 145        }
 146        mutex_unlock(&ab3100->access_mutex);
 147
 148        return err;
 149}
 150
 151static int ab3100_get_register_interruptible(struct ab3100 *ab3100,
 152                                             u8 reg, u8 *regval)
 153{
 154        int err;
 155
 156        err = mutex_lock_interruptible(&ab3100->access_mutex);
 157        if (err)
 158                return err;
 159
 160        /*
 161         * AB3100 require an I2C "stop" command between each message, else
 162         * it will not work. The only way of achieveing this with the
 163         * message transport layer is to send the read and write messages
 164         * separately.
 165         */
 166        err = i2c_master_send(ab3100->i2c_client, &reg, 1);
 167        if (err < 0) {
 168                dev_err(ab3100->dev,
 169                        "write error (send register address): %d\n",
 170                        err);
 171                goto get_reg_out_unlock;
 172        } else if (err != 1) {
 173                dev_err(ab3100->dev,
 174                        "write error (send register address) "
 175                        "%d bytes transferred (expected 1)\n",
 176                        err);
 177                err = -EIO;
 178                goto get_reg_out_unlock;
 179        } else {
 180                /* All is well */
 181                err = 0;
 182        }
 183
 184        err = i2c_master_recv(ab3100->i2c_client, regval, 1);
 185        if (err < 0) {
 186                dev_err(ab3100->dev,
 187                        "write error (read register): %d\n",
 188                        err);
 189                goto get_reg_out_unlock;
 190        } else if (err != 1) {
 191                dev_err(ab3100->dev,
 192                        "write error (read register) "
 193                        "%d bytes transferred (expected 1)\n",
 194                        err);
 195                err = -EIO;
 196                goto get_reg_out_unlock;
 197        } else {
 198                /* All is well */
 199                err = 0;
 200        }
 201
 202 get_reg_out_unlock:
 203        mutex_unlock(&ab3100->access_mutex);
 204        return err;
 205}
 206
 207static int get_register_interruptible(struct device *dev, u8 bank, u8 reg,
 208                                      u8 *value)
 209{
 210        struct ab3100 *ab3100 = dev_get_drvdata(dev->parent);
 211
 212        return ab3100_get_register_interruptible(ab3100, reg, value);
 213}
 214
 215static int ab3100_get_register_page_interruptible(struct ab3100 *ab3100,
 216                             u8 first_reg, u8 *regvals, u8 numregs)
 217{
 218        int err;
 219
 220        if (ab3100->chip_id == 0xa0 ||
 221            ab3100->chip_id == 0xa1)
 222                /* These don't support paged reads */
 223                return -EIO;
 224
 225        err = mutex_lock_interruptible(&ab3100->access_mutex);
 226        if (err)
 227                return err;
 228
 229        /*
 230         * Paged read also require an I2C "stop" command.
 231         */
 232        err = i2c_master_send(ab3100->i2c_client, &first_reg, 1);
 233        if (err < 0) {
 234                dev_err(ab3100->dev,
 235                        "write error (send first register address): %d\n",
 236                        err);
 237                goto get_reg_page_out_unlock;
 238        } else if (err != 1) {
 239                dev_err(ab3100->dev,
 240                        "write error (send first register address) "
 241                        "%d bytes transferred (expected 1)\n",
 242                        err);
 243                err = -EIO;
 244                goto get_reg_page_out_unlock;
 245        }
 246
 247        err = i2c_master_recv(ab3100->i2c_client, regvals, numregs);
 248        if (err < 0) {
 249                dev_err(ab3100->dev,
 250                        "write error (read register page): %d\n",
 251                        err);
 252                goto get_reg_page_out_unlock;
 253        } else if (err != numregs) {
 254                dev_err(ab3100->dev,
 255                        "write error (read register page) "
 256                        "%d bytes transferred (expected %d)\n",
 257                        err, numregs);
 258                err = -EIO;
 259                goto get_reg_page_out_unlock;
 260        }
 261
 262        /* All is well */
 263        err = 0;
 264
 265 get_reg_page_out_unlock:
 266        mutex_unlock(&ab3100->access_mutex);
 267        return err;
 268}
 269
 270static int get_register_page_interruptible(struct device *dev, u8 bank,
 271        u8 first_reg, u8 *regvals, u8 numregs)
 272{
 273        struct ab3100 *ab3100 = dev_get_drvdata(dev->parent);
 274
 275        return ab3100_get_register_page_interruptible(ab3100,
 276                        first_reg, regvals, numregs);
 277}
 278
 279static int ab3100_mask_and_set_register_interruptible(struct ab3100 *ab3100,
 280                                 u8 reg, u8 andmask, u8 ormask)
 281{
 282        u8 regandval[2] = {reg, 0};
 283        int err;
 284
 285        err = mutex_lock_interruptible(&ab3100->access_mutex);
 286        if (err)
 287                return err;
 288
 289        /* First read out the target register */
 290        err = i2c_master_send(ab3100->i2c_client, &reg, 1);
 291        if (err < 0) {
 292                dev_err(ab3100->dev,
 293                        "write error (maskset send address): %d\n",
 294                        err);
 295                goto get_maskset_unlock;
 296        } else if (err != 1) {
 297                dev_err(ab3100->dev,
 298                        "write error (maskset send address) "
 299                        "%d bytes transferred (expected 1)\n",
 300                        err);
 301                err = -EIO;
 302                goto get_maskset_unlock;
 303        }
 304
 305        err = i2c_master_recv(ab3100->i2c_client, &regandval[1], 1);
 306        if (err < 0) {
 307                dev_err(ab3100->dev,
 308                        "write error (maskset read register): %d\n",
 309                        err);
 310                goto get_maskset_unlock;
 311        } else if (err != 1) {
 312                dev_err(ab3100->dev,
 313                        "write error (maskset read register) "
 314                        "%d bytes transferred (expected 1)\n",
 315                        err);
 316                err = -EIO;
 317                goto get_maskset_unlock;
 318        }
 319
 320        /* Modify the register */
 321        regandval[1] &= andmask;
 322        regandval[1] |= ormask;
 323
 324        /* Write the register */
 325        err = i2c_master_send(ab3100->i2c_client, regandval, 2);
 326        if (err < 0) {
 327                dev_err(ab3100->dev,
 328                        "write error (write register): %d\n",
 329                        err);
 330                goto get_maskset_unlock;
 331        } else if (err != 2) {
 332                dev_err(ab3100->dev,
 333                        "write error (write register) "
 334                        "%d bytes transferred (expected 2)\n",
 335                        err);
 336                err = -EIO;
 337                goto get_maskset_unlock;
 338        }
 339
 340        /* All is well */
 341        err = 0;
 342
 343 get_maskset_unlock:
 344        mutex_unlock(&ab3100->access_mutex);
 345        return err;
 346}
 347
 348static int mask_and_set_register_interruptible(struct device *dev, u8 bank,
 349        u8 reg, u8 bitmask, u8 bitvalues)
 350{
 351        struct ab3100 *ab3100 = dev_get_drvdata(dev->parent);
 352
 353        return ab3100_mask_and_set_register_interruptible(ab3100,
 354                        reg, bitmask, (bitmask & bitvalues));
 355}
 356
 357/*
 358 * Register a simple callback for handling any AB3100 events.
 359 */
 360int ab3100_event_register(struct ab3100 *ab3100,
 361                          struct notifier_block *nb)
 362{
 363        return blocking_notifier_chain_register(&ab3100->event_subscribers,
 364                                               nb);
 365}
 366EXPORT_SYMBOL(ab3100_event_register);
 367
 368/*
 369 * Remove a previously registered callback.
 370 */
 371int ab3100_event_unregister(struct ab3100 *ab3100,
 372                            struct notifier_block *nb)
 373{
 374  return blocking_notifier_chain_unregister(&ab3100->event_subscribers,
 375                                            nb);
 376}
 377EXPORT_SYMBOL(ab3100_event_unregister);
 378
 379
 380static int ab3100_event_registers_startup_state_get(struct device *dev,
 381                                             u8 *event)
 382{
 383        struct ab3100 *ab3100 = dev_get_drvdata(dev->parent);
 384        if (!ab3100->startup_events_read)
 385                return -EAGAIN; /* Try again later */
 386        memcpy(event, ab3100->startup_events, 3);
 387        return 0;
 388}
 389
 390static struct abx500_ops ab3100_ops = {
 391        .get_chip_id = ab3100_get_chip_id,
 392        .set_register = set_register_interruptible,
 393        .get_register = get_register_interruptible,
 394        .get_register_page = get_register_page_interruptible,
 395        .set_register_page = NULL,
 396        .mask_and_set_register = mask_and_set_register_interruptible,
 397        .event_registers_startup_state_get =
 398                ab3100_event_registers_startup_state_get,
 399        .startup_irq_enabled = NULL,
 400};
 401
 402/*
 403 * This is a threaded interrupt handler so we can make some
 404 * I2C calls etc.
 405 */
 406static irqreturn_t ab3100_irq_handler(int irq, void *data)
 407{
 408        struct ab3100 *ab3100 = data;
 409        u8 event_regs[3];
 410        u32 fatevent;
 411        int err;
 412
 413        err = ab3100_get_register_page_interruptible(ab3100, AB3100_EVENTA1,
 414                                       event_regs, 3);
 415        if (err)
 416                goto err_event;
 417
 418        fatevent = (event_regs[0] << 16) |
 419                (event_regs[1] << 8) |
 420                event_regs[2];
 421
 422        if (!ab3100->startup_events_read) {
 423                ab3100->startup_events[0] = event_regs[0];
 424                ab3100->startup_events[1] = event_regs[1];
 425                ab3100->startup_events[2] = event_regs[2];
 426                ab3100->startup_events_read = true;
 427        }
 428        /*
 429         * The notified parties will have to mask out the events
 430         * they're interested in and react to them. They will be
 431         * notified on all events, then they use the fatevent value
 432         * to determine if they're interested.
 433         */
 434        blocking_notifier_call_chain(&ab3100->event_subscribers,
 435                                     fatevent, NULL);
 436
 437        dev_dbg(ab3100->dev,
 438                "IRQ Event: 0x%08x\n", fatevent);
 439
 440        return IRQ_HANDLED;
 441
 442 err_event:
 443        dev_dbg(ab3100->dev,
 444                "error reading event status\n");
 445        return IRQ_HANDLED;
 446}
 447
 448#ifdef CONFIG_DEBUG_FS
 449/*
 450 * Some debugfs entries only exposed if we're using debug
 451 */
 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 ssize_t ab3100_get_set_reg(struct file *file,
 486                                  const char __user *user_buf,
 487                                  size_t count, loff_t *ppos)
 488{
 489        struct ab3100_get_set_reg_priv *priv = file->private_data;
 490        struct ab3100 *ab3100 = priv->ab3100;
 491        char buf[32];
 492        ssize_t buf_size;
 493        int regp;
 494        unsigned long user_reg;
 495        int err;
 496        int i = 0;
 497
 498        /* Get userspace string and assure termination */
 499        buf_size = min(count, (sizeof(buf)-1));
 500        if (copy_from_user(buf, user_buf, buf_size))
 501                return -EFAULT;
 502        buf[buf_size] = 0;
 503
 504        /*
 505         * The idea is here to parse a string which is either
 506         * "0xnn" for reading a register, or "0xaa 0xbb" for
 507         * writing 0xbb to the register 0xaa. First move past
 508         * whitespace and then begin to parse the register.
 509         */
 510        while ((i < buf_size) && (buf[i] == ' '))
 511                i++;
 512        regp = i;
 513
 514        /*
 515         * Advance pointer to end of string then terminate
 516         * the register string. This is needed to satisfy
 517         * the strict_strtoul() function.
 518         */
 519        while ((i < buf_size) && (buf[i] != ' '))
 520                i++;
 521        buf[i] = '\0';
 522
 523        err = strict_strtoul(&buf[regp], 16, &user_reg);
 524        if (err)
 525                return err;
 526        if (user_reg > 0xff)
 527                return -EINVAL;
 528
 529        /* Either we read or we write a register here */
 530        if (!priv->mode) {
 531                /* Reading */
 532                u8 reg = (u8) user_reg;
 533                u8 regvalue;
 534
 535                ab3100_get_register_interruptible(ab3100, reg, &regvalue);
 536
 537                dev_info(ab3100->dev,
 538                         "debug read AB3100 reg[0x%02x]: 0x%02x\n",
 539                         reg, regvalue);
 540        } else {
 541                int valp;
 542                unsigned long user_value;
 543                u8 reg = (u8) user_reg;
 544                u8 value;
 545                u8 regvalue;
 546
 547                /*
 548                 * Writing, we need some value to write to
 549                 * the register so keep parsing the string
 550                 * from userspace.
 551                 */
 552                i++;
 553                while ((i < buf_size) && (buf[i] == ' '))
 554                        i++;
 555                valp = i;
 556                while ((i < buf_size) && (buf[i] != ' '))
 557                        i++;
 558                buf[i] = '\0';
 559
 560                err = strict_strtoul(&buf[valp], 16, &user_value);
 561                if (err)
 562                        return err;
 563                if (user_reg > 0xff)
 564                        return -EINVAL;
 565
 566                value = (u8) user_value;
 567                ab3100_set_register_interruptible(ab3100, reg, value);
 568                ab3100_get_register_interruptible(ab3100, reg, &regvalue);
 569
 570                dev_info(ab3100->dev,
 571                         "debug write reg[0x%02x] with 0x%02x, "
 572                         "after readback: 0x%02x\n",
 573                         reg, value, regvalue);
 574        }
 575        return buf_size;
 576}
 577
 578static const struct file_operations ab3100_get_set_reg_fops = {
 579        .open = simple_open,
 580        .write = ab3100_get_set_reg,
 581        .llseek = noop_llseek,
 582};
 583
 584static struct dentry *ab3100_dir;
 585static struct dentry *ab3100_reg_file;
 586static struct ab3100_get_set_reg_priv ab3100_get_priv;
 587static struct dentry *ab3100_get_reg_file;
 588static struct ab3100_get_set_reg_priv ab3100_set_priv;
 589static struct dentry *ab3100_set_reg_file;
 590
 591static void ab3100_setup_debugfs(struct ab3100 *ab3100)
 592{
 593        int err;
 594
 595        ab3100_dir = debugfs_create_dir("ab3100", NULL);
 596        if (!ab3100_dir)
 597                goto exit_no_debugfs;
 598
 599        ab3100_reg_file = debugfs_create_file("registers",
 600                                S_IRUGO, ab3100_dir, ab3100,
 601                                &ab3100_registers_fops);
 602        if (!ab3100_reg_file) {
 603                err = -ENOMEM;
 604                goto exit_destroy_dir;
 605        }
 606
 607        ab3100_get_priv.ab3100 = ab3100;
 608        ab3100_get_priv.mode = false;
 609        ab3100_get_reg_file = debugfs_create_file("get_reg",
 610                                S_IWUSR, ab3100_dir, &ab3100_get_priv,
 611                                &ab3100_get_set_reg_fops);
 612        if (!ab3100_get_reg_file) {
 613                err = -ENOMEM;
 614                goto exit_destroy_reg;
 615        }
 616
 617        ab3100_set_priv.ab3100 = ab3100;
 618        ab3100_set_priv.mode = true;
 619        ab3100_set_reg_file = debugfs_create_file("set_reg",
 620                                S_IWUSR, ab3100_dir, &ab3100_set_priv,
 621                                &ab3100_get_set_reg_fops);
 622        if (!ab3100_set_reg_file) {
 623                err = -ENOMEM;
 624                goto exit_destroy_get_reg;
 625        }
 626        return;
 627
 628 exit_destroy_get_reg:
 629        debugfs_remove(ab3100_get_reg_file);
 630 exit_destroy_reg:
 631        debugfs_remove(ab3100_reg_file);
 632 exit_destroy_dir:
 633        debugfs_remove(ab3100_dir);
 634 exit_no_debugfs:
 635        return;
 636}
 637static inline void ab3100_remove_debugfs(void)
 638{
 639        debugfs_remove(ab3100_set_reg_file);
 640        debugfs_remove(ab3100_get_reg_file);
 641        debugfs_remove(ab3100_reg_file);
 642        debugfs_remove(ab3100_dir);
 643}
 644#else
 645static inline void ab3100_setup_debugfs(struct ab3100 *ab3100)
 646{
 647}
 648static inline void ab3100_remove_debugfs(void)
 649{
 650}
 651#endif
 652
 653/*
 654 * Basic set-up, datastructure creation/destruction and I2C interface.
 655 * This sets up a default config in the AB3100 chip so that it
 656 * will work as expected.
 657 */
 658
 659struct ab3100_init_setting {
 660        u8 abreg;
 661        u8 setting;
 662};
 663
 664static const struct ab3100_init_setting ab3100_init_settings[] = {
 665        {
 666                .abreg = AB3100_MCA,
 667                .setting = 0x01
 668        }, {
 669                .abreg = AB3100_MCB,
 670                .setting = 0x30
 671        }, {
 672                .abreg = AB3100_IMRA1,
 673                .setting = 0x00
 674        }, {
 675                .abreg = AB3100_IMRA2,
 676                .setting = 0xFF
 677        }, {
 678                .abreg = AB3100_IMRA3,
 679                .setting = 0x01
 680        }, {
 681                .abreg = AB3100_IMRB1,
 682                .setting = 0xBF
 683        }, {
 684                .abreg = AB3100_IMRB2,
 685                .setting = 0xFF
 686        }, {
 687                .abreg = AB3100_IMRB3,
 688                .setting = 0xFF
 689        }, {
 690                .abreg = AB3100_SUP,
 691                .setting = 0x00
 692        }, {
 693                .abreg = AB3100_DIS,
 694                .setting = 0xF0
 695        }, {
 696                .abreg = AB3100_D0C,
 697                .setting = 0x00
 698        }, {
 699                .abreg = AB3100_D1C,
 700                .setting = 0x00
 701        }, {
 702                .abreg = AB3100_D2C,
 703                .setting = 0x00
 704        }, {
 705                .abreg = AB3100_D3C,
 706                .setting = 0x00
 707        },
 708};
 709
 710static int ab3100_setup(struct ab3100 *ab3100)
 711{
 712        int err = 0;
 713        int i;
 714
 715        for (i = 0; i < ARRAY_SIZE(ab3100_init_settings); i++) {
 716                err = ab3100_set_register_interruptible(ab3100,
 717                                          ab3100_init_settings[i].abreg,
 718                                          ab3100_init_settings[i].setting);
 719                if (err)
 720                        goto exit_no_setup;
 721        }
 722
 723        /*
 724         * Special trick to make the AB3100 use the 32kHz clock (RTC)
 725         * bit 3 in test register 0x02 is a special, undocumented test
 726         * register bit that only exist in AB3100 P1E
 727         */
 728        if (ab3100->chip_id == 0xc4) {
 729                dev_warn(ab3100->dev,
 730                         "AB3100 P1E variant detected, "
 731                         "forcing chip to 32KHz\n");
 732                err = ab3100_set_test_register_interruptible(ab3100,
 733                        0x02, 0x08);
 734        }
 735
 736 exit_no_setup:
 737        return err;
 738}
 739
 740/* The subdevices of the AB3100 */
 741static struct mfd_cell ab3100_devs[] = {
 742        {
 743                .name = "ab3100-dac",
 744                .id = -1,
 745        },
 746        {
 747                .name = "ab3100-leds",
 748                .id = -1,
 749        },
 750        {
 751                .name = "ab3100-power",
 752                .id = -1,
 753        },
 754        {
 755                .name = "ab3100-regulators",
 756                .of_compatible = "stericsson,ab3100-regulators",
 757                .id = -1,
 758        },
 759        {
 760                .name = "ab3100-sim",
 761                .id = -1,
 762        },
 763        {
 764                .name = "ab3100-uart",
 765                .id = -1,
 766        },
 767        {
 768                .name = "ab3100-rtc",
 769                .id = -1,
 770        },
 771        {
 772                .name = "ab3100-charger",
 773                .id = -1,
 774        },
 775        {
 776                .name = "ab3100-boost",
 777                .id = -1,
 778        },
 779        {
 780                .name = "ab3100-adc",
 781                .id = -1,
 782        },
 783        {
 784                .name = "ab3100-fuelgauge",
 785                .id = -1,
 786        },
 787        {
 788                .name = "ab3100-vibrator",
 789                .id = -1,
 790        },
 791        {
 792                .name = "ab3100-otp",
 793                .id = -1,
 794        },
 795        {
 796                .name = "ab3100-codec",
 797                .id = -1,
 798        },
 799};
 800
 801struct ab_family_id {
 802        u8      id;
 803        char    *name;
 804};
 805
 806static const struct ab_family_id ids[] = {
 807        /* AB3100 */
 808        {
 809                .id = 0xc0,
 810                .name = "P1A"
 811        }, {
 812                .id = 0xc1,
 813                .name = "P1B"
 814        }, {
 815                .id = 0xc2,
 816                .name = "P1C"
 817        }, {
 818                .id = 0xc3,
 819                .name = "P1D"
 820        }, {
 821                .id = 0xc4,
 822                .name = "P1E"
 823        }, {
 824                .id = 0xc5,
 825                .name = "P1F/R1A"
 826        }, {
 827                .id = 0xc6,
 828                .name = "P1G/R1A"
 829        }, {
 830                .id = 0xc7,
 831                .name = "P2A/R2A"
 832        }, {
 833                .id = 0xc8,
 834                .name = "P2B/R2B"
 835        },
 836        /* AB3000 variants, not supported */
 837        {
 838                .id = 0xa0
 839        }, {
 840                .id = 0xa1
 841        }, {
 842                .id = 0xa2
 843        }, {
 844                .id = 0xa3
 845        }, {
 846                .id = 0xa4
 847        }, {
 848                .id = 0xa5
 849        }, {
 850                .id = 0xa6
 851        }, {
 852                .id = 0xa7
 853        },
 854        /* Terminator */
 855        {
 856                .id = 0x00,
 857        },
 858};
 859
 860static int ab3100_probe(struct i2c_client *client,
 861                                  const struct i2c_device_id *id)
 862{
 863        struct ab3100 *ab3100;
 864        struct ab3100_platform_data *ab3100_plf_data =
 865                client->dev.platform_data;
 866        int err;
 867        int i;
 868
 869        ab3100 = devm_kzalloc(&client->dev, sizeof(struct ab3100), GFP_KERNEL);
 870        if (!ab3100) {
 871                dev_err(&client->dev, "could not allocate AB3100 device\n");
 872                return -ENOMEM;
 873        }
 874
 875        /* Initialize data structure */
 876        mutex_init(&ab3100->access_mutex);
 877        BLOCKING_INIT_NOTIFIER_HEAD(&ab3100->event_subscribers);
 878
 879        ab3100->i2c_client = client;
 880        ab3100->dev = &ab3100->i2c_client->dev;
 881
 882        i2c_set_clientdata(client, ab3100);
 883
 884        /* Read chip ID register */
 885        err = ab3100_get_register_interruptible(ab3100, AB3100_CID,
 886                                                &ab3100->chip_id);
 887        if (err) {
 888                dev_err(&client->dev,
 889                        "could not communicate with the AB3100 analog "
 890                        "baseband chip\n");
 891                goto exit_no_detect;
 892        }
 893
 894        for (i = 0; ids[i].id != 0x0; i++) {
 895                if (ids[i].id == ab3100->chip_id) {
 896                        if (ids[i].name != NULL) {
 897                                snprintf(&ab3100->chip_name[0],
 898                                         sizeof(ab3100->chip_name) - 1,
 899                                         "AB3100 %s",
 900                                         ids[i].name);
 901                                break;
 902                        } else {
 903                                dev_err(&client->dev,
 904                                        "AB3000 is not supported\n");
 905                                goto exit_no_detect;
 906                        }
 907                }
 908        }
 909
 910        if (ids[i].id == 0x0) {
 911                dev_err(&client->dev, "unknown analog baseband chip id: 0x%x\n",
 912                        ab3100->chip_id);
 913                dev_err(&client->dev, "accepting it anyway. Please update "
 914                        "the driver.\n");
 915                goto exit_no_detect;
 916        }
 917
 918        dev_info(&client->dev, "Detected chip: %s\n",
 919                 &ab3100->chip_name[0]);
 920
 921        /* Attach a second dummy i2c_client to the test register address */
 922        ab3100->testreg_client = i2c_new_dummy(client->adapter,
 923                                               client->addr + 1);
 924        if (!ab3100->testreg_client) {
 925                err = -ENOMEM;
 926                goto exit_no_testreg_client;
 927        }
 928
 929        err = ab3100_setup(ab3100);
 930        if (err)
 931                goto exit_no_setup;
 932
 933        err = devm_request_threaded_irq(&client->dev,
 934                                        client->irq, NULL, ab3100_irq_handler,
 935                                        IRQF_ONESHOT, "ab3100-core", ab3100);
 936        if (err)
 937                goto exit_no_irq;
 938
 939        err = abx500_register_ops(&client->dev, &ab3100_ops);
 940        if (err)
 941                goto exit_no_ops;
 942
 943        /* Set up and register the platform devices. */
 944        for (i = 0; i < ARRAY_SIZE(ab3100_devs); i++) {
 945                ab3100_devs[i].platform_data = ab3100_plf_data;
 946                ab3100_devs[i].pdata_size = sizeof(struct ab3100_platform_data);
 947        }
 948
 949        err = mfd_add_devices(&client->dev, 0, ab3100_devs,
 950                              ARRAY_SIZE(ab3100_devs), NULL, 0, NULL);
 951
 952        ab3100_setup_debugfs(ab3100);
 953
 954        return 0;
 955
 956 exit_no_ops:
 957 exit_no_irq:
 958 exit_no_setup:
 959        i2c_unregister_device(ab3100->testreg_client);
 960 exit_no_testreg_client:
 961 exit_no_detect:
 962        return err;
 963}
 964
 965static int ab3100_remove(struct i2c_client *client)
 966{
 967        struct ab3100 *ab3100 = i2c_get_clientdata(client);
 968
 969        /* Unregister subdevices */
 970        mfd_remove_devices(&client->dev);
 971        ab3100_remove_debugfs();
 972        i2c_unregister_device(ab3100->testreg_client);
 973        return 0;
 974}
 975
 976static const struct i2c_device_id ab3100_id[] = {
 977        { "ab3100", 0 },
 978        { }
 979};
 980MODULE_DEVICE_TABLE(i2c, ab3100_id);
 981
 982static struct i2c_driver ab3100_driver = {
 983        .driver = {
 984                .name   = "ab3100",
 985                .owner  = THIS_MODULE,
 986        },
 987        .id_table       = ab3100_id,
 988        .probe          = ab3100_probe,
 989        .remove         = ab3100_remove,
 990};
 991
 992static int __init ab3100_i2c_init(void)
 993{
 994        return i2c_add_driver(&ab3100_driver);
 995}
 996
 997static void __exit ab3100_i2c_exit(void)
 998{
 999        i2c_del_driver(&ab3100_driver);
1000}
1001
1002subsys_initcall(ab3100_i2c_init);
1003module_exit(ab3100_i2c_exit);
1004
1005MODULE_AUTHOR("Linus Walleij <linus.walleij@stericsson.com>");
1006MODULE_DESCRIPTION("AB3100 core driver");
1007MODULE_LICENSE("GPL");
1008
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