linux/drivers/mfd/ab3100-core.c
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   1// SPDX-License-Identifier: GPL-2.0-only
   2/*
   3 * Copyright (C) 2007-2010 ST-Ericsson
   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/init.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)\n"
  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)\n"
 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)\n"
 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)\n"
 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)\n"
 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)\n"
 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)\n"
 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)\n"
 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)\n"
 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
 385        if (!ab3100->startup_events_read)
 386                return -EAGAIN; /* Try again later */
 387        memcpy(event, ab3100->startup_events, 3);
 388
 389        return 0;
 390}
 391
 392static struct abx500_ops ab3100_ops = {
 393        .get_chip_id = ab3100_get_chip_id,
 394        .set_register = set_register_interruptible,
 395        .get_register = get_register_interruptible,
 396        .get_register_page = get_register_page_interruptible,
 397        .set_register_page = NULL,
 398        .mask_and_set_register = mask_and_set_register_interruptible,
 399        .event_registers_startup_state_get =
 400                ab3100_event_registers_startup_state_get,
 401        .startup_irq_enabled = NULL,
 402};
 403
 404/*
 405 * This is a threaded interrupt handler so we can make some
 406 * I2C calls etc.
 407 */
 408static irqreturn_t ab3100_irq_handler(int irq, void *data)
 409{
 410        struct ab3100 *ab3100 = data;
 411        u8 event_regs[3];
 412        u32 fatevent;
 413        int err;
 414
 415        err = ab3100_get_register_page_interruptible(ab3100, AB3100_EVENTA1,
 416                                       event_regs, 3);
 417        if (err)
 418                goto err_event;
 419
 420        fatevent = (event_regs[0] << 16) |
 421                (event_regs[1] << 8) |
 422                event_regs[2];
 423
 424        if (!ab3100->startup_events_read) {
 425                ab3100->startup_events[0] = event_regs[0];
 426                ab3100->startup_events[1] = event_regs[1];
 427                ab3100->startup_events[2] = event_regs[2];
 428                ab3100->startup_events_read = true;
 429        }
 430        /*
 431         * The notified parties will have to mask out the events
 432         * they're interested in and react to them. They will be
 433         * notified on all events, then they use the fatevent value
 434         * to determine if they're interested.
 435         */
 436        blocking_notifier_call_chain(&ab3100->event_subscribers,
 437                                     fatevent, NULL);
 438
 439        dev_dbg(ab3100->dev,
 440                "IRQ Event: 0x%08x\n", fatevent);
 441
 442        return IRQ_HANDLED;
 443
 444 err_event:
 445        dev_dbg(ab3100->dev,
 446                "error reading event status\n");
 447        return IRQ_HANDLED;
 448}
 449
 450#ifdef CONFIG_DEBUG_FS
 451/*
 452 * Some debugfs entries only exposed if we're using debug
 453 */
 454static int ab3100_registers_print(struct seq_file *s, void *p)
 455{
 456        struct ab3100 *ab3100 = s->private;
 457        u8 value;
 458        u8 reg;
 459
 460        seq_puts(s, "AB3100 registers:\n");
 461
 462        for (reg = 0; reg < 0xff; reg++) {
 463                ab3100_get_register_interruptible(ab3100, reg, &value);
 464                seq_printf(s, "[0x%x]:  0x%x\n", reg, value);
 465        }
 466        return 0;
 467}
 468
 469static int ab3100_registers_open(struct inode *inode, struct file *file)
 470{
 471        return single_open(file, ab3100_registers_print, inode->i_private);
 472}
 473
 474static const struct file_operations ab3100_registers_fops = {
 475        .open = ab3100_registers_open,
 476        .read = seq_read,
 477        .llseek = seq_lseek,
 478        .release = single_release,
 479        .owner = THIS_MODULE,
 480};
 481
 482struct ab3100_get_set_reg_priv {
 483        struct ab3100 *ab3100;
 484        bool mode;
 485};
 486
 487static ssize_t ab3100_get_set_reg(struct file *file,
 488                                  const char __user *user_buf,
 489                                  size_t count, loff_t *ppos)
 490{
 491        struct ab3100_get_set_reg_priv *priv = file->private_data;
 492        struct ab3100 *ab3100 = priv->ab3100;
 493        char buf[32];
 494        ssize_t buf_size;
 495        int regp;
 496        u8 user_reg;
 497        int err;
 498        int i = 0;
 499
 500        /* Get userspace string and assure termination */
 501        buf_size = min(count, (sizeof(buf)-1));
 502        if (copy_from_user(buf, user_buf, buf_size))
 503                return -EFAULT;
 504        buf[buf_size] = 0;
 505
 506        /*
 507         * The idea is here to parse a string which is either
 508         * "0xnn" for reading a register, or "0xaa 0xbb" for
 509         * writing 0xbb to the register 0xaa. First move past
 510         * whitespace and then begin to parse the register.
 511         */
 512        while ((i < buf_size) && (buf[i] == ' '))
 513                i++;
 514        regp = i;
 515
 516        /*
 517         * Advance pointer to end of string then terminate
 518         * the register string. This is needed to satisfy
 519         * the kstrtou8() function.
 520         */
 521        while ((i < buf_size) && (buf[i] != ' '))
 522                i++;
 523        buf[i] = '\0';
 524
 525        err = kstrtou8(&buf[regp], 16, &user_reg);
 526        if (err)
 527                return err;
 528
 529        /* Either we read or we write a register here */
 530        if (!priv->mode) {
 531                /* Reading */
 532                u8 regvalue;
 533
 534                ab3100_get_register_interruptible(ab3100, user_reg, &regvalue);
 535
 536                dev_info(ab3100->dev,
 537                         "debug read AB3100 reg[0x%02x]: 0x%02x\n",
 538                         user_reg, regvalue);
 539        } else {
 540                int valp;
 541                u8 user_value;
 542                u8 regvalue;
 543
 544                /*
 545                 * Writing, we need some value to write to
 546                 * the register so keep parsing the string
 547                 * from userspace.
 548                 */
 549                i++;
 550                while ((i < buf_size) && (buf[i] == ' '))
 551                        i++;
 552                valp = i;
 553                while ((i < buf_size) && (buf[i] != ' '))
 554                        i++;
 555                buf[i] = '\0';
 556
 557                err = kstrtou8(&buf[valp], 16, &user_value);
 558                if (err)
 559                        return err;
 560
 561                ab3100_set_register_interruptible(ab3100, user_reg, user_value);
 562                ab3100_get_register_interruptible(ab3100, user_reg, &regvalue);
 563
 564                dev_info(ab3100->dev,
 565                         "debug write reg[0x%02x]\n"
 566                         "  with 0x%02x, after readback: 0x%02x\n",
 567                         user_reg, user_value, regvalue);
 568        }
 569        return buf_size;
 570}
 571
 572static const struct file_operations ab3100_get_set_reg_fops = {
 573        .open = simple_open,
 574        .write = ab3100_get_set_reg,
 575        .llseek = noop_llseek,
 576};
 577
 578static struct ab3100_get_set_reg_priv ab3100_get_priv;
 579static struct ab3100_get_set_reg_priv ab3100_set_priv;
 580
 581static void ab3100_setup_debugfs(struct ab3100 *ab3100)
 582{
 583        struct dentry *ab3100_dir;
 584
 585        ab3100_dir = debugfs_create_dir("ab3100", NULL);
 586
 587        debugfs_create_file("registers", S_IRUGO, ab3100_dir, ab3100,
 588                            &ab3100_registers_fops);
 589
 590        ab3100_get_priv.ab3100 = ab3100;
 591        ab3100_get_priv.mode = false;
 592        debugfs_create_file("get_reg", S_IWUSR, ab3100_dir, &ab3100_get_priv,
 593                            &ab3100_get_set_reg_fops);
 594
 595        ab3100_set_priv.ab3100 = ab3100;
 596        ab3100_set_priv.mode = true;
 597        debugfs_create_file("set_reg", S_IWUSR, ab3100_dir, &ab3100_set_priv,
 598                            &ab3100_get_set_reg_fops);
 599}
 600#else
 601static inline void ab3100_setup_debugfs(struct ab3100 *ab3100)
 602{
 603}
 604#endif
 605
 606/*
 607 * Basic set-up, datastructure creation/destruction and I2C interface.
 608 * This sets up a default config in the AB3100 chip so that it
 609 * will work as expected.
 610 */
 611
 612struct ab3100_init_setting {
 613        u8 abreg;
 614        u8 setting;
 615};
 616
 617static const struct ab3100_init_setting ab3100_init_settings[] = {
 618        {
 619                .abreg = AB3100_MCA,
 620                .setting = 0x01
 621        }, {
 622                .abreg = AB3100_MCB,
 623                .setting = 0x30
 624        }, {
 625                .abreg = AB3100_IMRA1,
 626                .setting = 0x00
 627        }, {
 628                .abreg = AB3100_IMRA2,
 629                .setting = 0xFF
 630        }, {
 631                .abreg = AB3100_IMRA3,
 632                .setting = 0x01
 633        }, {
 634                .abreg = AB3100_IMRB1,
 635                .setting = 0xBF
 636        }, {
 637                .abreg = AB3100_IMRB2,
 638                .setting = 0xFF
 639        }, {
 640                .abreg = AB3100_IMRB3,
 641                .setting = 0xFF
 642        }, {
 643                .abreg = AB3100_SUP,
 644                .setting = 0x00
 645        }, {
 646                .abreg = AB3100_DIS,
 647                .setting = 0xF0
 648        }, {
 649                .abreg = AB3100_D0C,
 650                .setting = 0x00
 651        }, {
 652                .abreg = AB3100_D1C,
 653                .setting = 0x00
 654        }, {
 655                .abreg = AB3100_D2C,
 656                .setting = 0x00
 657        }, {
 658                .abreg = AB3100_D3C,
 659                .setting = 0x00
 660        },
 661};
 662
 663static int ab3100_setup(struct ab3100 *ab3100)
 664{
 665        int err = 0;
 666        int i;
 667
 668        for (i = 0; i < ARRAY_SIZE(ab3100_init_settings); i++) {
 669                err = ab3100_set_register_interruptible(ab3100,
 670                                          ab3100_init_settings[i].abreg,
 671                                          ab3100_init_settings[i].setting);
 672                if (err)
 673                        goto exit_no_setup;
 674        }
 675
 676        /*
 677         * Special trick to make the AB3100 use the 32kHz clock (RTC)
 678         * bit 3 in test register 0x02 is a special, undocumented test
 679         * register bit that only exist in AB3100 P1E
 680         */
 681        if (ab3100->chip_id == 0xc4) {
 682                dev_warn(ab3100->dev,
 683                         "AB3100 P1E variant detected forcing chip to 32KHz\n");
 684                err = ab3100_set_test_register_interruptible(ab3100,
 685                        0x02, 0x08);
 686        }
 687
 688 exit_no_setup:
 689        return err;
 690}
 691
 692/* The subdevices of the AB3100 */
 693static struct mfd_cell ab3100_devs[] = {
 694        {
 695                .name = "ab3100-dac",
 696                .id = -1,
 697        },
 698        {
 699                .name = "ab3100-leds",
 700                .id = -1,
 701        },
 702        {
 703                .name = "ab3100-power",
 704                .id = -1,
 705        },
 706        {
 707                .name = "ab3100-regulators",
 708                .of_compatible = "stericsson,ab3100-regulators",
 709                .id = -1,
 710        },
 711        {
 712                .name = "ab3100-sim",
 713                .id = -1,
 714        },
 715        {
 716                .name = "ab3100-uart",
 717                .id = -1,
 718        },
 719        {
 720                .name = "ab3100-rtc",
 721                .id = -1,
 722        },
 723        {
 724                .name = "ab3100-charger",
 725                .id = -1,
 726        },
 727        {
 728                .name = "ab3100-boost",
 729                .id = -1,
 730        },
 731        {
 732                .name = "ab3100-adc",
 733                .id = -1,
 734        },
 735        {
 736                .name = "ab3100-fuelgauge",
 737                .id = -1,
 738        },
 739        {
 740                .name = "ab3100-vibrator",
 741                .id = -1,
 742        },
 743        {
 744                .name = "ab3100-otp",
 745                .id = -1,
 746        },
 747        {
 748                .name = "ab3100-codec",
 749                .id = -1,
 750        },
 751};
 752
 753struct ab_family_id {
 754        u8      id;
 755        char    *name;
 756};
 757
 758static const struct ab_family_id ids[] = {
 759        /* AB3100 */
 760        {
 761                .id = 0xc0,
 762                .name = "P1A"
 763        }, {
 764                .id = 0xc1,
 765                .name = "P1B"
 766        }, {
 767                .id = 0xc2,
 768                .name = "P1C"
 769        }, {
 770                .id = 0xc3,
 771                .name = "P1D"
 772        }, {
 773                .id = 0xc4,
 774                .name = "P1E"
 775        }, {
 776                .id = 0xc5,
 777                .name = "P1F/R1A"
 778        }, {
 779                .id = 0xc6,
 780                .name = "P1G/R1A"
 781        }, {
 782                .id = 0xc7,
 783                .name = "P2A/R2A"
 784        }, {
 785                .id = 0xc8,
 786                .name = "P2B/R2B"
 787        },
 788        /* AB3000 variants, not supported */
 789        {
 790                .id = 0xa0
 791        }, {
 792                .id = 0xa1
 793        }, {
 794                .id = 0xa2
 795        }, {
 796                .id = 0xa3
 797        }, {
 798                .id = 0xa4
 799        }, {
 800                .id = 0xa5
 801        }, {
 802                .id = 0xa6
 803        }, {
 804                .id = 0xa7
 805        },
 806        /* Terminator */
 807        {
 808                .id = 0x00,
 809        },
 810};
 811
 812static int ab3100_probe(struct i2c_client *client,
 813                                  const struct i2c_device_id *id)
 814{
 815        struct ab3100 *ab3100;
 816        struct ab3100_platform_data *ab3100_plf_data =
 817                dev_get_platdata(&client->dev);
 818        int err;
 819        int i;
 820
 821        ab3100 = devm_kzalloc(&client->dev, sizeof(struct ab3100), GFP_KERNEL);
 822        if (!ab3100)
 823                return -ENOMEM;
 824
 825        /* Initialize data structure */
 826        mutex_init(&ab3100->access_mutex);
 827        BLOCKING_INIT_NOTIFIER_HEAD(&ab3100->event_subscribers);
 828
 829        ab3100->i2c_client = client;
 830        ab3100->dev = &ab3100->i2c_client->dev;
 831
 832        i2c_set_clientdata(client, ab3100);
 833
 834        /* Read chip ID register */
 835        err = ab3100_get_register_interruptible(ab3100, AB3100_CID,
 836                                                &ab3100->chip_id);
 837        if (err) {
 838                dev_err(&client->dev,
 839                        "failed to communicate with AB3100 chip\n");
 840                goto exit_no_detect;
 841        }
 842
 843        for (i = 0; ids[i].id != 0x0; i++) {
 844                if (ids[i].id == ab3100->chip_id) {
 845                        if (ids[i].name)
 846                                break;
 847
 848                        dev_err(&client->dev, "AB3000 is not supported\n");
 849                        goto exit_no_detect;
 850                }
 851        }
 852
 853        snprintf(&ab3100->chip_name[0],
 854                 sizeof(ab3100->chip_name) - 1, "AB3100 %s", ids[i].name);
 855
 856        if (ids[i].id == 0x0) {
 857                dev_err(&client->dev, "unknown analog baseband chip id: 0x%x\n",
 858                        ab3100->chip_id);
 859                dev_err(&client->dev,
 860                        "accepting it anyway. Please update the driver.\n");
 861                goto exit_no_detect;
 862        }
 863
 864        dev_info(&client->dev, "Detected chip: %s\n",
 865                 &ab3100->chip_name[0]);
 866
 867        /* Attach a second dummy i2c_client to the test register address */
 868        ab3100->testreg_client = i2c_new_dummy_device(client->adapter,
 869                                               client->addr + 1);
 870        if (IS_ERR(ab3100->testreg_client)) {
 871                err = PTR_ERR(ab3100->testreg_client);
 872                goto exit_no_testreg_client;
 873        }
 874
 875        err = ab3100_setup(ab3100);
 876        if (err)
 877                goto exit_no_setup;
 878
 879        err = devm_request_threaded_irq(&client->dev,
 880                                        client->irq, NULL, ab3100_irq_handler,
 881                                        IRQF_ONESHOT, "ab3100-core", ab3100);
 882        if (err)
 883                goto exit_no_irq;
 884
 885        err = abx500_register_ops(&client->dev, &ab3100_ops);
 886        if (err)
 887                goto exit_no_ops;
 888
 889        /* Set up and register the platform devices. */
 890        for (i = 0; i < ARRAY_SIZE(ab3100_devs); i++) {
 891                ab3100_devs[i].platform_data = ab3100_plf_data;
 892                ab3100_devs[i].pdata_size = sizeof(struct ab3100_platform_data);
 893        }
 894
 895        err = mfd_add_devices(&client->dev, 0, ab3100_devs,
 896                              ARRAY_SIZE(ab3100_devs), NULL, 0, NULL);
 897
 898        ab3100_setup_debugfs(ab3100);
 899
 900        return 0;
 901
 902 exit_no_ops:
 903 exit_no_irq:
 904 exit_no_setup:
 905        i2c_unregister_device(ab3100->testreg_client);
 906 exit_no_testreg_client:
 907 exit_no_detect:
 908        return err;
 909}
 910
 911static const struct i2c_device_id ab3100_id[] = {
 912        { "ab3100", 0 },
 913        { }
 914};
 915
 916static struct i2c_driver ab3100_driver = {
 917        .driver = {
 918                .name                   = "ab3100",
 919                .suppress_bind_attrs    = true,
 920        },
 921        .id_table       = ab3100_id,
 922        .probe          = ab3100_probe,
 923};
 924
 925static int __init ab3100_i2c_init(void)
 926{
 927        return i2c_add_driver(&ab3100_driver);
 928}
 929subsys_initcall(ab3100_i2c_init);
 930