linux/drivers/mfd/wm8350-core.c
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   1/*
   2 * wm8350-core.c  --  Device access for Wolfson WM8350
   3 *
   4 * Copyright 2007, 2008 Wolfson Microelectronics PLC.
   5 *
   6 * Author: Liam Girdwood, Mark Brown
   7 *
   8 *  This program is free software; you can redistribute  it and/or modify it
   9 *  under  the terms of  the GNU General  Public License as published by the
  10 *  Free Software Foundation;  either version 2 of the  License, or (at your
  11 *  option) any later version.
  12 *
  13 */
  14
  15#include <linux/kernel.h>
  16#include <linux/module.h>
  17#include <linux/init.h>
  18#include <linux/slab.h>
  19#include <linux/bug.h>
  20#include <linux/device.h>
  21#include <linux/delay.h>
  22#include <linux/interrupt.h>
  23#include <linux/regmap.h>
  24#include <linux/workqueue.h>
  25
  26#include <linux/mfd/wm8350/core.h>
  27#include <linux/mfd/wm8350/audio.h>
  28#include <linux/mfd/wm8350/comparator.h>
  29#include <linux/mfd/wm8350/gpio.h>
  30#include <linux/mfd/wm8350/pmic.h>
  31#include <linux/mfd/wm8350/rtc.h>
  32#include <linux/mfd/wm8350/supply.h>
  33#include <linux/mfd/wm8350/wdt.h>
  34
  35#define WM8350_CLOCK_CONTROL_1          0x28
  36#define WM8350_AIF_TEST                 0x74
  37
  38/* debug */
  39#define WM8350_BUS_DEBUG 0
  40#if WM8350_BUS_DEBUG
  41#define dump(regs, src) do { \
  42        int i_; \
  43        u16 *src_ = src; \
  44        printk(KERN_DEBUG); \
  45        for (i_ = 0; i_ < regs; i_++) \
  46                printk(" 0x%4.4x", *src_++); \
  47        printk("\n"); \
  48} while (0);
  49#else
  50#define dump(bytes, src)
  51#endif
  52
  53#define WM8350_LOCK_DEBUG 0
  54#if WM8350_LOCK_DEBUG
  55#define ldbg(format, arg...) printk(format, ## arg)
  56#else
  57#define ldbg(format, arg...)
  58#endif
  59
  60/*
  61 * WM8350 Device IO
  62 */
  63static DEFINE_MUTEX(reg_lock_mutex);
  64
  65/*
  66 * Safe read, modify, write methods
  67 */
  68int wm8350_clear_bits(struct wm8350 *wm8350, u16 reg, u16 mask)
  69{
  70        return regmap_update_bits(wm8350->regmap, reg, mask, 0);
  71}
  72EXPORT_SYMBOL_GPL(wm8350_clear_bits);
  73
  74int wm8350_set_bits(struct wm8350 *wm8350, u16 reg, u16 mask)
  75{
  76        return regmap_update_bits(wm8350->regmap, reg, mask, mask);
  77}
  78EXPORT_SYMBOL_GPL(wm8350_set_bits);
  79
  80u16 wm8350_reg_read(struct wm8350 *wm8350, int reg)
  81{
  82        unsigned int data;
  83        int err;
  84
  85        err = regmap_read(wm8350->regmap, reg, &data);
  86        if (err)
  87                dev_err(wm8350->dev, "read from reg R%d failed\n", reg);
  88
  89        return data;
  90}
  91EXPORT_SYMBOL_GPL(wm8350_reg_read);
  92
  93int wm8350_reg_write(struct wm8350 *wm8350, int reg, u16 val)
  94{
  95        int ret;
  96
  97        ret = regmap_write(wm8350->regmap, reg, val);
  98
  99        if (ret)
 100                dev_err(wm8350->dev, "write to reg R%d failed\n", reg);
 101        return ret;
 102}
 103EXPORT_SYMBOL_GPL(wm8350_reg_write);
 104
 105int wm8350_block_read(struct wm8350 *wm8350, int start_reg, int regs,
 106                      u16 *dest)
 107{
 108        int err = 0;
 109
 110        err = regmap_bulk_read(wm8350->regmap, start_reg, dest, regs);
 111        if (err)
 112                dev_err(wm8350->dev, "block read starting from R%d failed\n",
 113                        start_reg);
 114
 115        return err;
 116}
 117EXPORT_SYMBOL_GPL(wm8350_block_read);
 118
 119int wm8350_block_write(struct wm8350 *wm8350, int start_reg, int regs,
 120                       u16 *src)
 121{
 122        int ret = 0;
 123
 124        ret = regmap_bulk_write(wm8350->regmap, start_reg, src, regs);
 125        if (ret)
 126                dev_err(wm8350->dev, "block write starting at R%d failed\n",
 127                        start_reg);
 128
 129        return ret;
 130}
 131EXPORT_SYMBOL_GPL(wm8350_block_write);
 132
 133/**
 134 * wm8350_reg_lock()
 135 *
 136 * The WM8350 has a hardware lock which can be used to prevent writes to
 137 * some registers (generally those which can cause particularly serious
 138 * problems if misused).  This function enables that lock.
 139 */
 140int wm8350_reg_lock(struct wm8350 *wm8350)
 141{
 142        int ret;
 143
 144        mutex_lock(&reg_lock_mutex);
 145
 146        ldbg(__func__);
 147
 148        ret = wm8350_reg_write(wm8350, WM8350_SECURITY, WM8350_LOCK_KEY);
 149        if (ret)
 150                dev_err(wm8350->dev, "lock failed\n");
 151
 152        wm8350->unlocked = false;
 153
 154        mutex_unlock(&reg_lock_mutex);
 155
 156        return ret;
 157}
 158EXPORT_SYMBOL_GPL(wm8350_reg_lock);
 159
 160/**
 161 * wm8350_reg_unlock()
 162 *
 163 * The WM8350 has a hardware lock which can be used to prevent writes to
 164 * some registers (generally those which can cause particularly serious
 165 * problems if misused).  This function disables that lock so updates
 166 * can be performed.  For maximum safety this should be done only when
 167 * required.
 168 */
 169int wm8350_reg_unlock(struct wm8350 *wm8350)
 170{
 171        int ret;
 172
 173        mutex_lock(&reg_lock_mutex);
 174
 175        ldbg(__func__);
 176
 177        ret = wm8350_reg_write(wm8350, WM8350_SECURITY, WM8350_UNLOCK_KEY);
 178        if (ret)
 179                dev_err(wm8350->dev, "unlock failed\n");
 180
 181        wm8350->unlocked = true;
 182
 183        mutex_unlock(&reg_lock_mutex);
 184
 185        return ret;
 186}
 187EXPORT_SYMBOL_GPL(wm8350_reg_unlock);
 188
 189int wm8350_read_auxadc(struct wm8350 *wm8350, int channel, int scale, int vref)
 190{
 191        u16 reg, result = 0;
 192
 193        if (channel < WM8350_AUXADC_AUX1 || channel > WM8350_AUXADC_TEMP)
 194                return -EINVAL;
 195        if (channel >= WM8350_AUXADC_USB && channel <= WM8350_AUXADC_TEMP
 196            && (scale != 0 || vref != 0))
 197                return -EINVAL;
 198
 199        mutex_lock(&wm8350->auxadc_mutex);
 200
 201        /* Turn on the ADC */
 202        reg = wm8350_reg_read(wm8350, WM8350_POWER_MGMT_5);
 203        wm8350_reg_write(wm8350, WM8350_POWER_MGMT_5, reg | WM8350_AUXADC_ENA);
 204
 205        if (scale || vref) {
 206                reg = scale << 13;
 207                reg |= vref << 12;
 208                wm8350_reg_write(wm8350, WM8350_AUX1_READBACK + channel, reg);
 209        }
 210
 211        reg = wm8350_reg_read(wm8350, WM8350_DIGITISER_CONTROL_1);
 212        reg |= 1 << channel | WM8350_AUXADC_POLL;
 213        wm8350_reg_write(wm8350, WM8350_DIGITISER_CONTROL_1, reg);
 214
 215        /* If a late IRQ left the completion signalled then consume
 216         * the completion. */
 217        try_wait_for_completion(&wm8350->auxadc_done);
 218
 219        /* We ignore the result of the completion and just check for a
 220         * conversion result, allowing us to soldier on if the IRQ
 221         * infrastructure is not set up for the chip. */
 222        wait_for_completion_timeout(&wm8350->auxadc_done, msecs_to_jiffies(5));
 223
 224        reg = wm8350_reg_read(wm8350, WM8350_DIGITISER_CONTROL_1);
 225        if (reg & WM8350_AUXADC_POLL)
 226                dev_err(wm8350->dev, "adc chn %d read timeout\n", channel);
 227        else
 228                result = wm8350_reg_read(wm8350,
 229                                         WM8350_AUX1_READBACK + channel);
 230
 231        /* Turn off the ADC */
 232        reg = wm8350_reg_read(wm8350, WM8350_POWER_MGMT_5);
 233        wm8350_reg_write(wm8350, WM8350_POWER_MGMT_5,
 234                         reg & ~WM8350_AUXADC_ENA);
 235
 236        mutex_unlock(&wm8350->auxadc_mutex);
 237
 238        return result & WM8350_AUXADC_DATA1_MASK;
 239}
 240EXPORT_SYMBOL_GPL(wm8350_read_auxadc);
 241
 242static irqreturn_t wm8350_auxadc_irq(int irq, void *irq_data)
 243{
 244        struct wm8350 *wm8350 = irq_data;
 245
 246        complete(&wm8350->auxadc_done);
 247
 248        return IRQ_HANDLED;
 249}
 250
 251/*
 252 * Register a client device.  This is non-fatal since there is no need to
 253 * fail the entire device init due to a single platform device failing.
 254 */
 255static void wm8350_client_dev_register(struct wm8350 *wm8350,
 256                                       const char *name,
 257                                       struct platform_device **pdev)
 258{
 259        int ret;
 260
 261        *pdev = platform_device_alloc(name, -1);
 262        if (*pdev == NULL) {
 263                dev_err(wm8350->dev, "Failed to allocate %s\n", name);
 264                return;
 265        }
 266
 267        (*pdev)->dev.parent = wm8350->dev;
 268        platform_set_drvdata(*pdev, wm8350);
 269        ret = platform_device_add(*pdev);
 270        if (ret != 0) {
 271                dev_err(wm8350->dev, "Failed to register %s: %d\n", name, ret);
 272                platform_device_put(*pdev);
 273                *pdev = NULL;
 274        }
 275}
 276
 277int wm8350_device_init(struct wm8350 *wm8350, int irq,
 278                       struct wm8350_platform_data *pdata)
 279{
 280        int ret;
 281        unsigned int id1, id2, mask_rev;
 282        unsigned int cust_id, mode, chip_rev;
 283
 284        dev_set_drvdata(wm8350->dev, wm8350);
 285
 286        /* get WM8350 revision and config mode */
 287        ret = regmap_read(wm8350->regmap, WM8350_RESET_ID, &id1);
 288        if (ret != 0) {
 289                dev_err(wm8350->dev, "Failed to read ID: %d\n", ret);
 290                goto err;
 291        }
 292
 293        ret = regmap_read(wm8350->regmap, WM8350_ID, &id2);
 294        if (ret != 0) {
 295                dev_err(wm8350->dev, "Failed to read ID: %d\n", ret);
 296                goto err;
 297        }
 298
 299        ret = regmap_read(wm8350->regmap, WM8350_REVISION, &mask_rev);
 300        if (ret != 0) {
 301                dev_err(wm8350->dev, "Failed to read revision: %d\n", ret);
 302                goto err;
 303        }
 304
 305        if (id1 != 0x6143) {
 306                dev_err(wm8350->dev,
 307                        "Device with ID %x is not a WM8350\n", id1);
 308                ret = -ENODEV;
 309                goto err;
 310        }
 311
 312        mode = id2 & WM8350_CONF_STS_MASK >> 10;
 313        cust_id = id2 & WM8350_CUST_ID_MASK;
 314        chip_rev = (id2 & WM8350_CHIP_REV_MASK) >> 12;
 315        dev_info(wm8350->dev,
 316                 "CONF_STS %d, CUST_ID %d, MASK_REV %d, CHIP_REV %d\n",
 317                 mode, cust_id, mask_rev, chip_rev);
 318
 319        if (cust_id != 0) {
 320                dev_err(wm8350->dev, "Unsupported CUST_ID\n");
 321                ret = -ENODEV;
 322                goto err;
 323        }
 324
 325        switch (mask_rev) {
 326        case 0:
 327                wm8350->pmic.max_dcdc = WM8350_DCDC_6;
 328                wm8350->pmic.max_isink = WM8350_ISINK_B;
 329
 330                switch (chip_rev) {
 331                case WM8350_REV_E:
 332                        dev_info(wm8350->dev, "WM8350 Rev E\n");
 333                        break;
 334                case WM8350_REV_F:
 335                        dev_info(wm8350->dev, "WM8350 Rev F\n");
 336                        break;
 337                case WM8350_REV_G:
 338                        dev_info(wm8350->dev, "WM8350 Rev G\n");
 339                        wm8350->power.rev_g_coeff = 1;
 340                        break;
 341                case WM8350_REV_H:
 342                        dev_info(wm8350->dev, "WM8350 Rev H\n");
 343                        wm8350->power.rev_g_coeff = 1;
 344                        break;
 345                default:
 346                        /* For safety we refuse to run on unknown hardware */
 347                        dev_err(wm8350->dev, "Unknown WM8350 CHIP_REV\n");
 348                        ret = -ENODEV;
 349                        goto err;
 350                }
 351                break;
 352
 353        case 1:
 354                wm8350->pmic.max_dcdc = WM8350_DCDC_4;
 355                wm8350->pmic.max_isink = WM8350_ISINK_A;
 356
 357                switch (chip_rev) {
 358                case 0:
 359                        dev_info(wm8350->dev, "WM8351 Rev A\n");
 360                        wm8350->power.rev_g_coeff = 1;
 361                        break;
 362
 363                case 1:
 364                        dev_info(wm8350->dev, "WM8351 Rev B\n");
 365                        wm8350->power.rev_g_coeff = 1;
 366                        break;
 367
 368                default:
 369                        dev_err(wm8350->dev, "Unknown WM8351 CHIP_REV\n");
 370                        ret = -ENODEV;
 371                        goto err;
 372                }
 373                break;
 374
 375        case 2:
 376                wm8350->pmic.max_dcdc = WM8350_DCDC_6;
 377                wm8350->pmic.max_isink = WM8350_ISINK_B;
 378
 379                switch (chip_rev) {
 380                case 0:
 381                        dev_info(wm8350->dev, "WM8352 Rev A\n");
 382                        wm8350->power.rev_g_coeff = 1;
 383                        break;
 384
 385                default:
 386                        dev_err(wm8350->dev, "Unknown WM8352 CHIP_REV\n");
 387                        ret = -ENODEV;
 388                        goto err;
 389                }
 390                break;
 391
 392        default:
 393                dev_err(wm8350->dev, "Unknown MASK_REV\n");
 394                ret = -ENODEV;
 395                goto err;
 396        }
 397
 398        mutex_init(&wm8350->auxadc_mutex);
 399        init_completion(&wm8350->auxadc_done);
 400
 401        ret = wm8350_irq_init(wm8350, irq, pdata);
 402        if (ret < 0)
 403                goto err;
 404
 405        if (wm8350->irq_base) {
 406                ret = request_threaded_irq(wm8350->irq_base +
 407                                           WM8350_IRQ_AUXADC_DATARDY,
 408                                           NULL, wm8350_auxadc_irq, 0,
 409                                           "auxadc", wm8350);
 410                if (ret < 0)
 411                        dev_warn(wm8350->dev,
 412                                 "Failed to request AUXADC IRQ: %d\n", ret);
 413        }
 414
 415        if (pdata && pdata->init) {
 416                ret = pdata->init(wm8350);
 417                if (ret != 0) {
 418                        dev_err(wm8350->dev, "Platform init() failed: %d\n",
 419                                ret);
 420                        goto err_irq;
 421                }
 422        }
 423
 424        wm8350_reg_write(wm8350, WM8350_SYSTEM_INTERRUPTS_MASK, 0x0);
 425
 426        wm8350_client_dev_register(wm8350, "wm8350-codec",
 427                                   &(wm8350->codec.pdev));
 428        wm8350_client_dev_register(wm8350, "wm8350-gpio",
 429                                   &(wm8350->gpio.pdev));
 430        wm8350_client_dev_register(wm8350, "wm8350-hwmon",
 431                                   &(wm8350->hwmon.pdev));
 432        wm8350_client_dev_register(wm8350, "wm8350-power",
 433                                   &(wm8350->power.pdev));
 434        wm8350_client_dev_register(wm8350, "wm8350-rtc", &(wm8350->rtc.pdev));
 435        wm8350_client_dev_register(wm8350, "wm8350-wdt", &(wm8350->wdt.pdev));
 436
 437        return 0;
 438
 439err_irq:
 440        wm8350_irq_exit(wm8350);
 441err:
 442        return ret;
 443}
 444EXPORT_SYMBOL_GPL(wm8350_device_init);
 445
 446void wm8350_device_exit(struct wm8350 *wm8350)
 447{
 448        int i;
 449
 450        for (i = 0; i < ARRAY_SIZE(wm8350->pmic.led); i++)
 451                platform_device_unregister(wm8350->pmic.led[i].pdev);
 452
 453        for (i = 0; i < ARRAY_SIZE(wm8350->pmic.pdev); i++)
 454                platform_device_unregister(wm8350->pmic.pdev[i]);
 455
 456        platform_device_unregister(wm8350->wdt.pdev);
 457        platform_device_unregister(wm8350->rtc.pdev);
 458        platform_device_unregister(wm8350->power.pdev);
 459        platform_device_unregister(wm8350->hwmon.pdev);
 460        platform_device_unregister(wm8350->gpio.pdev);
 461        platform_device_unregister(wm8350->codec.pdev);
 462
 463        if (wm8350->irq_base)
 464                free_irq(wm8350->irq_base + WM8350_IRQ_AUXADC_DATARDY, wm8350);
 465
 466        wm8350_irq_exit(wm8350);
 467}
 468EXPORT_SYMBOL_GPL(wm8350_device_exit);
 469
 470MODULE_DESCRIPTION("WM8350 AudioPlus PMIC core driver");
 471MODULE_LICENSE("GPL");
 472
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