linux/drivers/power/pcf50633-charger.c
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   1/* NXP PCF50633 Main Battery Charger Driver
   2 *
   3 * (C) 2006-2008 by Openmoko, Inc.
   4 * Author: Balaji Rao <balajirrao@openmoko.org>
   5 * All rights reserved.
   6 *
   7 * Broken down from monstrous PCF50633 driver mainly by
   8 * Harald Welte, Andy Green and Werner Almesberger
   9 *
  10 *  This program is free software; you can redistribute  it and/or modify it
  11 *  under  the terms of  the GNU General  Public License as published by the
  12 *  Free Software Foundation;  either version 2 of the  License, or (at your
  13 *  option) any later version.
  14 *
  15 */
  16
  17#include <linux/kernel.h>
  18#include <linux/module.h>
  19#include <linux/slab.h>
  20#include <linux/init.h>
  21#include <linux/types.h>
  22#include <linux/device.h>
  23#include <linux/sysfs.h>
  24#include <linux/platform_device.h>
  25#include <linux/power_supply.h>
  26
  27#include <linux/mfd/pcf50633/core.h>
  28#include <linux/mfd/pcf50633/mbc.h>
  29
  30struct pcf50633_mbc {
  31        struct pcf50633 *pcf;
  32
  33        int adapter_online;
  34        int usb_online;
  35
  36        struct power_supply usb;
  37        struct power_supply adapter;
  38        struct power_supply ac;
  39};
  40
  41int pcf50633_mbc_usb_curlim_set(struct pcf50633 *pcf, int ma)
  42{
  43        struct pcf50633_mbc *mbc = platform_get_drvdata(pcf->mbc_pdev);
  44        int ret = 0;
  45        u8 bits;
  46        int charging_start = 1;
  47        u8 mbcs2, chgmod;
  48        unsigned int mbcc5;
  49
  50        if (ma >= 1000) {
  51                bits = PCF50633_MBCC7_USB_1000mA;
  52                ma = 1000;
  53        } else if (ma >= 500) {
  54                bits = PCF50633_MBCC7_USB_500mA;
  55                ma = 500;
  56        } else if (ma >= 100) {
  57                bits = PCF50633_MBCC7_USB_100mA;
  58                ma = 100;
  59        } else {
  60                bits = PCF50633_MBCC7_USB_SUSPEND;
  61                charging_start = 0;
  62                ma = 0;
  63        }
  64
  65        ret = pcf50633_reg_set_bit_mask(pcf, PCF50633_REG_MBCC7,
  66                                        PCF50633_MBCC7_USB_MASK, bits);
  67        if (ret)
  68                dev_err(pcf->dev, "error setting usb curlim to %d mA\n", ma);
  69        else
  70                dev_info(pcf->dev, "usb curlim to %d mA\n", ma);
  71
  72        /*
  73         * We limit the charging current to be the USB current limit.
  74         * The reason is that on pcf50633, when it enters PMU Standby mode,
  75         * which it does when the device goes "off", the USB current limit
  76         * reverts to the variant default.  In at least one common case, that
  77         * default is 500mA.  By setting the charging current to be the same
  78         * as the USB limit we set here before PMU standby, we enforce it only
  79         * using the correct amount of current even when the USB current limit
  80         * gets reset to the wrong thing
  81         */
  82
  83        if (mbc->pcf->pdata->charger_reference_current_ma) {
  84                mbcc5 = (ma << 8) / mbc->pcf->pdata->charger_reference_current_ma;
  85                if (mbcc5 > 255)
  86                        mbcc5 = 255;
  87                pcf50633_reg_write(mbc->pcf, PCF50633_REG_MBCC5, mbcc5);
  88        }
  89
  90        mbcs2 = pcf50633_reg_read(mbc->pcf, PCF50633_REG_MBCS2);
  91        chgmod = (mbcs2 & PCF50633_MBCS2_MBC_MASK);
  92
  93        /* If chgmod == BATFULL, setting chgena has no effect.
  94         * Datasheet says we need to set resume instead but when autoresume is
  95         * used resume doesn't work. Clear and set chgena instead.
  96         */
  97        if (chgmod != PCF50633_MBCS2_MBC_BAT_FULL)
  98                pcf50633_reg_set_bit_mask(pcf, PCF50633_REG_MBCC1,
  99                                PCF50633_MBCC1_CHGENA, PCF50633_MBCC1_CHGENA);
 100        else {
 101                pcf50633_reg_clear_bits(pcf, PCF50633_REG_MBCC1,
 102                                PCF50633_MBCC1_CHGENA);
 103                pcf50633_reg_set_bit_mask(pcf, PCF50633_REG_MBCC1,
 104                                PCF50633_MBCC1_CHGENA, PCF50633_MBCC1_CHGENA);
 105        }
 106
 107        power_supply_changed(&mbc->usb);
 108
 109        return ret;
 110}
 111EXPORT_SYMBOL_GPL(pcf50633_mbc_usb_curlim_set);
 112
 113int pcf50633_mbc_get_status(struct pcf50633 *pcf)
 114{
 115        struct pcf50633_mbc *mbc  = platform_get_drvdata(pcf->mbc_pdev);
 116        int status = 0;
 117        u8 chgmod;
 118
 119        if (!mbc)
 120                return 0;
 121
 122        chgmod = pcf50633_reg_read(mbc->pcf, PCF50633_REG_MBCS2)
 123                & PCF50633_MBCS2_MBC_MASK;
 124
 125        if (mbc->usb_online)
 126                status |= PCF50633_MBC_USB_ONLINE;
 127        if (chgmod == PCF50633_MBCS2_MBC_USB_PRE ||
 128            chgmod == PCF50633_MBCS2_MBC_USB_PRE_WAIT ||
 129            chgmod == PCF50633_MBCS2_MBC_USB_FAST ||
 130            chgmod == PCF50633_MBCS2_MBC_USB_FAST_WAIT)
 131                status |= PCF50633_MBC_USB_ACTIVE;
 132        if (mbc->adapter_online)
 133                status |= PCF50633_MBC_ADAPTER_ONLINE;
 134        if (chgmod == PCF50633_MBCS2_MBC_ADP_PRE ||
 135            chgmod == PCF50633_MBCS2_MBC_ADP_PRE_WAIT ||
 136            chgmod == PCF50633_MBCS2_MBC_ADP_FAST ||
 137            chgmod == PCF50633_MBCS2_MBC_ADP_FAST_WAIT)
 138                status |= PCF50633_MBC_ADAPTER_ACTIVE;
 139
 140        return status;
 141}
 142EXPORT_SYMBOL_GPL(pcf50633_mbc_get_status);
 143
 144int pcf50633_mbc_get_usb_online_status(struct pcf50633 *pcf)
 145{
 146        struct pcf50633_mbc *mbc  = platform_get_drvdata(pcf->mbc_pdev);
 147
 148        if (!mbc)
 149                return 0;
 150
 151        return mbc->usb_online;
 152}
 153EXPORT_SYMBOL_GPL(pcf50633_mbc_get_usb_online_status);
 154
 155static ssize_t
 156show_chgmode(struct device *dev, struct device_attribute *attr, char *buf)
 157{
 158        struct pcf50633_mbc *mbc = dev_get_drvdata(dev);
 159
 160        u8 mbcs2 = pcf50633_reg_read(mbc->pcf, PCF50633_REG_MBCS2);
 161        u8 chgmod = (mbcs2 & PCF50633_MBCS2_MBC_MASK);
 162
 163        return sprintf(buf, "%d\n", chgmod);
 164}
 165static DEVICE_ATTR(chgmode, S_IRUGO, show_chgmode, NULL);
 166
 167static ssize_t
 168show_usblim(struct device *dev, struct device_attribute *attr, char *buf)
 169{
 170        struct pcf50633_mbc *mbc = dev_get_drvdata(dev);
 171        u8 usblim = pcf50633_reg_read(mbc->pcf, PCF50633_REG_MBCC7) &
 172                                                PCF50633_MBCC7_USB_MASK;
 173        unsigned int ma;
 174
 175        if (usblim == PCF50633_MBCC7_USB_1000mA)
 176                ma = 1000;
 177        else if (usblim == PCF50633_MBCC7_USB_500mA)
 178                ma = 500;
 179        else if (usblim == PCF50633_MBCC7_USB_100mA)
 180                ma = 100;
 181        else
 182                ma = 0;
 183
 184        return sprintf(buf, "%u\n", ma);
 185}
 186
 187static ssize_t set_usblim(struct device *dev,
 188                struct device_attribute *attr, const char *buf, size_t count)
 189{
 190        struct pcf50633_mbc *mbc = dev_get_drvdata(dev);
 191        unsigned long ma;
 192        int ret;
 193
 194        ret = strict_strtoul(buf, 10, &ma);
 195        if (ret)
 196                return -EINVAL;
 197
 198        pcf50633_mbc_usb_curlim_set(mbc->pcf, ma);
 199
 200        return count;
 201}
 202
 203static DEVICE_ATTR(usb_curlim, S_IRUGO | S_IWUSR, show_usblim, set_usblim);
 204
 205static ssize_t
 206show_chglim(struct device *dev, struct device_attribute *attr, char *buf)
 207{
 208        struct pcf50633_mbc *mbc = dev_get_drvdata(dev);
 209        u8 mbcc5 = pcf50633_reg_read(mbc->pcf, PCF50633_REG_MBCC5);
 210        unsigned int ma;
 211
 212        if (!mbc->pcf->pdata->charger_reference_current_ma)
 213                return -ENODEV;
 214
 215        ma = (mbc->pcf->pdata->charger_reference_current_ma *  mbcc5) >> 8;
 216
 217        return sprintf(buf, "%u\n", ma);
 218}
 219
 220static ssize_t set_chglim(struct device *dev,
 221                struct device_attribute *attr, const char *buf, size_t count)
 222{
 223        struct pcf50633_mbc *mbc = dev_get_drvdata(dev);
 224        unsigned long ma;
 225        unsigned int mbcc5;
 226        int ret;
 227
 228        if (!mbc->pcf->pdata->charger_reference_current_ma)
 229                return -ENODEV;
 230
 231        ret = strict_strtoul(buf, 10, &ma);
 232        if (ret)
 233                return -EINVAL;
 234
 235        mbcc5 = (ma << 8) / mbc->pcf->pdata->charger_reference_current_ma;
 236        if (mbcc5 > 255)
 237                mbcc5 = 255;
 238        pcf50633_reg_write(mbc->pcf, PCF50633_REG_MBCC5, mbcc5);
 239
 240        return count;
 241}
 242
 243/*
 244 * This attribute allows to change MBC charging limit on the fly
 245 * independently of usb current limit. It also gets set automatically every
 246 * time usb current limit is changed.
 247 */
 248static DEVICE_ATTR(chg_curlim, S_IRUGO | S_IWUSR, show_chglim, set_chglim);
 249
 250static struct attribute *pcf50633_mbc_sysfs_entries[] = {
 251        &dev_attr_chgmode.attr,
 252        &dev_attr_usb_curlim.attr,
 253        &dev_attr_chg_curlim.attr,
 254        NULL,
 255};
 256
 257static struct attribute_group mbc_attr_group = {
 258        .name   = NULL,                 /* put in device directory */
 259        .attrs  = pcf50633_mbc_sysfs_entries,
 260};
 261
 262static void
 263pcf50633_mbc_irq_handler(int irq, void *data)
 264{
 265        struct pcf50633_mbc *mbc = data;
 266
 267        /* USB */
 268        if (irq == PCF50633_IRQ_USBINS) {
 269                mbc->usb_online = 1;
 270        } else if (irq == PCF50633_IRQ_USBREM) {
 271                mbc->usb_online = 0;
 272                pcf50633_mbc_usb_curlim_set(mbc->pcf, 0);
 273        }
 274
 275        /* Adapter */
 276        if (irq == PCF50633_IRQ_ADPINS)
 277                mbc->adapter_online = 1;
 278        else if (irq == PCF50633_IRQ_ADPREM)
 279                mbc->adapter_online = 0;
 280
 281        power_supply_changed(&mbc->ac);
 282        power_supply_changed(&mbc->usb);
 283        power_supply_changed(&mbc->adapter);
 284
 285        if (mbc->pcf->pdata->mbc_event_callback)
 286                mbc->pcf->pdata->mbc_event_callback(mbc->pcf, irq);
 287}
 288
 289static int adapter_get_property(struct power_supply *psy,
 290                        enum power_supply_property psp,
 291                        union power_supply_propval *val)
 292{
 293        struct pcf50633_mbc *mbc = container_of(psy,
 294                                struct pcf50633_mbc, adapter);
 295        int ret = 0;
 296
 297        switch (psp) {
 298        case POWER_SUPPLY_PROP_ONLINE:
 299                val->intval =  mbc->adapter_online;
 300                break;
 301        default:
 302                ret = -EINVAL;
 303                break;
 304        }
 305        return ret;
 306}
 307
 308static int usb_get_property(struct power_supply *psy,
 309                        enum power_supply_property psp,
 310                        union power_supply_propval *val)
 311{
 312        struct pcf50633_mbc *mbc = container_of(psy, struct pcf50633_mbc, usb);
 313        int ret = 0;
 314        u8 usblim = pcf50633_reg_read(mbc->pcf, PCF50633_REG_MBCC7) &
 315                                                PCF50633_MBCC7_USB_MASK;
 316
 317        switch (psp) {
 318        case POWER_SUPPLY_PROP_ONLINE:
 319                val->intval = mbc->usb_online &&
 320                                (usblim <= PCF50633_MBCC7_USB_500mA);
 321                break;
 322        default:
 323                ret = -EINVAL;
 324                break;
 325        }
 326        return ret;
 327}
 328
 329static int ac_get_property(struct power_supply *psy,
 330                        enum power_supply_property psp,
 331                        union power_supply_propval *val)
 332{
 333        struct pcf50633_mbc *mbc = container_of(psy, struct pcf50633_mbc, ac);
 334        int ret = 0;
 335        u8 usblim = pcf50633_reg_read(mbc->pcf, PCF50633_REG_MBCC7) &
 336                                                PCF50633_MBCC7_USB_MASK;
 337
 338        switch (psp) {
 339        case POWER_SUPPLY_PROP_ONLINE:
 340                val->intval = mbc->usb_online &&
 341                                (usblim == PCF50633_MBCC7_USB_1000mA);
 342                break;
 343        default:
 344                ret = -EINVAL;
 345                break;
 346        }
 347        return ret;
 348}
 349
 350static enum power_supply_property power_props[] = {
 351        POWER_SUPPLY_PROP_ONLINE,
 352};
 353
 354static const u8 mbc_irq_handlers[] = {
 355        PCF50633_IRQ_ADPINS,
 356        PCF50633_IRQ_ADPREM,
 357        PCF50633_IRQ_USBINS,
 358        PCF50633_IRQ_USBREM,
 359        PCF50633_IRQ_BATFULL,
 360        PCF50633_IRQ_CHGHALT,
 361        PCF50633_IRQ_THLIMON,
 362        PCF50633_IRQ_THLIMOFF,
 363        PCF50633_IRQ_USBLIMON,
 364        PCF50633_IRQ_USBLIMOFF,
 365        PCF50633_IRQ_LOWSYS,
 366        PCF50633_IRQ_LOWBAT,
 367};
 368
 369static int __devinit pcf50633_mbc_probe(struct platform_device *pdev)
 370{
 371        struct pcf50633_mbc *mbc;
 372        int ret;
 373        int i;
 374        u8 mbcs1;
 375
 376        mbc = kzalloc(sizeof(*mbc), GFP_KERNEL);
 377        if (!mbc)
 378                return -ENOMEM;
 379
 380        platform_set_drvdata(pdev, mbc);
 381        mbc->pcf = dev_to_pcf50633(pdev->dev.parent);
 382
 383        /* Set up IRQ handlers */
 384        for (i = 0; i < ARRAY_SIZE(mbc_irq_handlers); i++)
 385                pcf50633_register_irq(mbc->pcf, mbc_irq_handlers[i],
 386                                        pcf50633_mbc_irq_handler, mbc);
 387
 388        /* Create power supplies */
 389        mbc->adapter.name               = "adapter";
 390        mbc->adapter.type               = POWER_SUPPLY_TYPE_MAINS;
 391        mbc->adapter.properties         = power_props;
 392        mbc->adapter.num_properties     = ARRAY_SIZE(power_props);
 393        mbc->adapter.get_property       = &adapter_get_property;
 394        mbc->adapter.supplied_to        = mbc->pcf->pdata->batteries;
 395        mbc->adapter.num_supplicants    = mbc->pcf->pdata->num_batteries;
 396
 397        mbc->usb.name                   = "usb";
 398        mbc->usb.type                   = POWER_SUPPLY_TYPE_USB;
 399        mbc->usb.properties             = power_props;
 400        mbc->usb.num_properties         = ARRAY_SIZE(power_props);
 401        mbc->usb.get_property           = usb_get_property;
 402        mbc->usb.supplied_to            = mbc->pcf->pdata->batteries;
 403        mbc->usb.num_supplicants        = mbc->pcf->pdata->num_batteries;
 404
 405        mbc->ac.name                    = "ac";
 406        mbc->ac.type                    = POWER_SUPPLY_TYPE_MAINS;
 407        mbc->ac.properties              = power_props;
 408        mbc->ac.num_properties          = ARRAY_SIZE(power_props);
 409        mbc->ac.get_property            = ac_get_property;
 410        mbc->ac.supplied_to             = mbc->pcf->pdata->batteries;
 411        mbc->ac.num_supplicants         = mbc->pcf->pdata->num_batteries;
 412
 413        ret = power_supply_register(&pdev->dev, &mbc->adapter);
 414        if (ret) {
 415                dev_err(mbc->pcf->dev, "failed to register adapter\n");
 416                kfree(mbc);
 417                return ret;
 418        }
 419
 420        ret = power_supply_register(&pdev->dev, &mbc->usb);
 421        if (ret) {
 422                dev_err(mbc->pcf->dev, "failed to register usb\n");
 423                power_supply_unregister(&mbc->adapter);
 424                kfree(mbc);
 425                return ret;
 426        }
 427
 428        ret = power_supply_register(&pdev->dev, &mbc->ac);
 429        if (ret) {
 430                dev_err(mbc->pcf->dev, "failed to register ac\n");
 431                power_supply_unregister(&mbc->adapter);
 432                power_supply_unregister(&mbc->usb);
 433                kfree(mbc);
 434                return ret;
 435        }
 436
 437        ret = sysfs_create_group(&pdev->dev.kobj, &mbc_attr_group);
 438        if (ret)
 439                dev_err(mbc->pcf->dev, "failed to create sysfs entries\n");
 440
 441        mbcs1 = pcf50633_reg_read(mbc->pcf, PCF50633_REG_MBCS1);
 442        if (mbcs1 & PCF50633_MBCS1_USBPRES)
 443                pcf50633_mbc_irq_handler(PCF50633_IRQ_USBINS, mbc);
 444        if (mbcs1 & PCF50633_MBCS1_ADAPTPRES)
 445                pcf50633_mbc_irq_handler(PCF50633_IRQ_ADPINS, mbc);
 446
 447        return 0;
 448}
 449
 450static int __devexit pcf50633_mbc_remove(struct platform_device *pdev)
 451{
 452        struct pcf50633_mbc *mbc = platform_get_drvdata(pdev);
 453        int i;
 454
 455        /* Remove IRQ handlers */
 456        for (i = 0; i < ARRAY_SIZE(mbc_irq_handlers); i++)
 457                pcf50633_free_irq(mbc->pcf, mbc_irq_handlers[i]);
 458
 459        sysfs_remove_group(&pdev->dev.kobj, &mbc_attr_group);
 460        power_supply_unregister(&mbc->usb);
 461        power_supply_unregister(&mbc->adapter);
 462        power_supply_unregister(&mbc->ac);
 463
 464        kfree(mbc);
 465
 466        return 0;
 467}
 468
 469static struct platform_driver pcf50633_mbc_driver = {
 470        .driver = {
 471                .name = "pcf50633-mbc",
 472        },
 473        .probe = pcf50633_mbc_probe,
 474        .remove = __devexit_p(pcf50633_mbc_remove),
 475};
 476
 477module_platform_driver(pcf50633_mbc_driver);
 478
 479MODULE_AUTHOR("Balaji Rao <balajirrao@openmoko.org>");
 480MODULE_DESCRIPTION("PCF50633 mbc driver");
 481MODULE_LICENSE("GPL");
 482MODULE_ALIAS("platform:pcf50633-mbc");
 483
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