drivers/power/pcf50633-charger.c

   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
  30 struct 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
  41 int 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 }
 111 EXPORT_SYMBOL_GPL(pcf50633_mbc_usb_curlim_set);
 112
 113 int 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 }
 142 EXPORT_SYMBOL_GPL(pcf50633_mbc_get_status);
 143
 144 int 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 }
 153 EXPORT_SYMBOL_GPL(pcf50633_mbc_get_usb_online_status);
 154
 155 static ssize_t
 156 show_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 }
 165 static DEVICE_ATTR(chgmode, S_IRUGO, show_chgmode, NULL);
 166
 167 static ssize_t
 168 show_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
 187 static 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 = kstrtoul(buf, 10, &ma);
 195         if (ret)
 196                 return ret;
 197
 198         pcf50633_mbc_usb_curlim_set(mbc->pcf, ma);
 199
 200         return count;
 201 }
 202
 203 static DEVICE_ATTR(usb_curlim, S_IRUGO | S_IWUSR, show_usblim, set_usblim);
 204
 205 static ssize_t
 206 show_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
 220 static 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 = kstrtoul(buf, 10, &ma);
 232         if (ret)
 233                 return ret;
 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  */
 248 static DEVICE_ATTR(chg_curlim, S_IRUGO | S_IWUSR, show_chglim, set_chglim);
 249
 250 static 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
 257 static struct attribute_group mbc_attr_group = {
 258         .name   = NULL,                 /* put in device directory */
 259         .attrs  = pcf50633_mbc_sysfs_entries,
 260 };
 261
 262 static void
 263 pcf50633_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
 289 static 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
 308 static 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
 329 static 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
 350 static enum power_supply_property power_props[] = {
 351         POWER_SUPPLY_PROP_ONLINE,
 352 };
 353
 354 static 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
 369 static int 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 = devm_kzalloc(&pdev->dev, 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                 return ret;
 417         }
 418
 419         ret = power_supply_register(&pdev->dev, &mbc->usb);
 420         if (ret) {
 421                 dev_err(mbc->pcf->dev, "failed to register usb\n");
 422                 power_supply_unregister(&mbc->adapter);
 423                 return ret;
 424         }
 425
 426         ret = power_supply_register(&pdev->dev, &mbc->ac);
 427         if (ret) {
 428                 dev_err(mbc->pcf->dev, "failed to register ac\n");
 429                 power_supply_unregister(&mbc->adapter);
 430                 power_supply_unregister(&mbc->usb);
 431                 return ret;
 432         }
 433
 434         ret = sysfs_create_group(&pdev->dev.kobj, &mbc_attr_group);
 435         if (ret)
 436                 dev_err(mbc->pcf->dev, "failed to create sysfs entries\n");
 437
 438         mbcs1 = pcf50633_reg_read(mbc->pcf, PCF50633_REG_MBCS1);
 439         if (mbcs1 & PCF50633_MBCS1_USBPRES)
 440                 pcf50633_mbc_irq_handler(PCF50633_IRQ_USBINS, mbc);
 441         if (mbcs1 & PCF50633_MBCS1_ADAPTPRES)
 442                 pcf50633_mbc_irq_handler(PCF50633_IRQ_ADPINS, mbc);
 443
 444         return 0;
 445 }
 446
 447 static int pcf50633_mbc_remove(struct platform_device *pdev)
 448 {
 449         struct pcf50633_mbc *mbc = platform_get_drvdata(pdev);
 450         int i;
 451
 452         /* Remove IRQ handlers */
 453         for (i = 0; i < ARRAY_SIZE(mbc_irq_handlers); i++)
 454                 pcf50633_free_irq(mbc->pcf, mbc_irq_handlers[i]);
 455
 456         sysfs_remove_group(&pdev->dev.kobj, &mbc_attr_group);
 457         power_supply_unregister(&mbc->usb);
 458         power_supply_unregister(&mbc->adapter);
 459         power_supply_unregister(&mbc->ac);
 460
 461         return 0;
 462 }
 463
 464 static struct platform_driver pcf50633_mbc_driver = {
 465         .driver = {
 466                 .name = "pcf50633-mbc",
 467         },
 468         .probe = pcf50633_mbc_probe,
 469         .remove = pcf50633_mbc_remove,
 470 };
 471
 472 module_platform_driver(pcf50633_mbc_driver);
 473
 474 MODULE_AUTHOR("Balaji Rao <balajirrao@openmoko.org>");
 475 MODULE_DESCRIPTION("PCF50633 mbc driver");
 476 MODULE_LICENSE("GPL");
 477 MODULE_ALIAS("platform:pcf50633-mbc");