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 = power_supply_get_drvdata(psy);
 294         int ret = 0;
 295
 296         switch (psp) {
 297         case POWER_SUPPLY_PROP_ONLINE:
 298                 val->intval =  mbc->adapter_online;
 299                 break;
 300         default:
 301                 ret = -EINVAL;
 302                 break;
 303         }
 304         return ret;
 305 }
 306
 307 static int usb_get_property(struct power_supply *psy,
 308                         enum power_supply_property psp,
 309                         union power_supply_propval *val)
 310 {
 311         struct pcf50633_mbc *mbc = power_supply_get_drvdata(psy);
 312         int ret = 0;
 313         u8 usblim = pcf50633_reg_read(mbc->pcf, PCF50633_REG_MBCC7) &
 314                                                 PCF50633_MBCC7_USB_MASK;
 315
 316         switch (psp) {
 317         case POWER_SUPPLY_PROP_ONLINE:
 318                 val->intval = mbc->usb_online &&
 319                                 (usblim <= PCF50633_MBCC7_USB_500mA);
 320                 break;
 321         default:
 322                 ret = -EINVAL;
 323                 break;
 324         }
 325         return ret;
 326 }
 327
 328 static int ac_get_property(struct power_supply *psy,
 329                         enum power_supply_property psp,
 330                         union power_supply_propval *val)
 331 {
 332         struct pcf50633_mbc *mbc = power_supply_get_drvdata(psy);
 333         int ret = 0;
 334         u8 usblim = pcf50633_reg_read(mbc->pcf, PCF50633_REG_MBCC7) &
 335                                                 PCF50633_MBCC7_USB_MASK;
 336
 337         switch (psp) {
 338         case POWER_SUPPLY_PROP_ONLINE:
 339                 val->intval = mbc->usb_online &&
 340                                 (usblim == PCF50633_MBCC7_USB_1000mA);
 341                 break;
 342         default:
 343                 ret = -EINVAL;
 344                 break;
 345         }
 346         return ret;
 347 }
 348
 349 static enum power_supply_property power_props[] = {
 350         POWER_SUPPLY_PROP_ONLINE,
 351 };
 352
 353 static const u8 mbc_irq_handlers[] = {
 354         PCF50633_IRQ_ADPINS,
 355         PCF50633_IRQ_ADPREM,
 356         PCF50633_IRQ_USBINS,
 357         PCF50633_IRQ_USBREM,
 358         PCF50633_IRQ_BATFULL,
 359         PCF50633_IRQ_CHGHALT,
 360         PCF50633_IRQ_THLIMON,
 361         PCF50633_IRQ_THLIMOFF,
 362         PCF50633_IRQ_USBLIMON,
 363         PCF50633_IRQ_USBLIMOFF,
 364         PCF50633_IRQ_LOWSYS,
 365         PCF50633_IRQ_LOWBAT,
 366 };
 367
 368 static const struct power_supply_desc pcf50633_mbc_adapter_desc = {
 369         .name           = "adapter",
 370         .type           = POWER_SUPPLY_TYPE_MAINS,
 371         .properties     = power_props,
 372         .num_properties = ARRAY_SIZE(power_props),
 373         .get_property   = &adapter_get_property,
 374 };
 375
 376 static const struct power_supply_desc pcf50633_mbc_usb_desc = {
 377         .name           = "usb",
 378         .type           = POWER_SUPPLY_TYPE_USB,
 379         .properties     = power_props,
 380         .num_properties = ARRAY_SIZE(power_props),
 381         .get_property   = usb_get_property,
 382 };
 383
 384 static const struct power_supply_desc pcf50633_mbc_ac_desc = {
 385         .name           = "ac",
 386         .type           = POWER_SUPPLY_TYPE_MAINS,
 387         .properties     = power_props,
 388         .num_properties = ARRAY_SIZE(power_props),
 389         .get_property   = ac_get_property,
 390 };
 391
 392 static int pcf50633_mbc_probe(struct platform_device *pdev)
 393 {
 394         struct power_supply_config psy_cfg = {};
 395         struct pcf50633_mbc *mbc;
 396         int ret;
 397         int i;
 398         u8 mbcs1;
 399
 400         mbc = devm_kzalloc(&pdev->dev, sizeof(*mbc), GFP_KERNEL);
 401         if (!mbc)
 402                 return -ENOMEM;
 403
 404         platform_set_drvdata(pdev, mbc);
 405         mbc->pcf = dev_to_pcf50633(pdev->dev.parent);
 406
 407         /* Set up IRQ handlers */
 408         for (i = 0; i < ARRAY_SIZE(mbc_irq_handlers); i++)
 409                 pcf50633_register_irq(mbc->pcf, mbc_irq_handlers[i],
 410                                         pcf50633_mbc_irq_handler, mbc);
 411
 412         psy_cfg.supplied_to             = mbc->pcf->pdata->batteries;
 413         psy_cfg.num_supplicants         = mbc->pcf->pdata->num_batteries;
 414         psy_cfg.drv_data                = mbc;
 415
 416         /* Create power supplies */
 417         mbc->adapter = power_supply_register(&pdev->dev,
 418                                              &pcf50633_mbc_adapter_desc,
 419                                              &psy_cfg);
 420         if (IS_ERR(mbc->adapter)) {
 421                 dev_err(mbc->pcf->dev, "failed to register adapter\n");
 422                 ret = PTR_ERR(mbc->adapter);
 423                 return ret;
 424         }
 425
 426         mbc->usb = power_supply_register(&pdev->dev, &pcf50633_mbc_usb_desc,
 427                                          &psy_cfg);
 428         if (IS_ERR(mbc->usb)) {
 429                 dev_err(mbc->pcf->dev, "failed to register usb\n");
 430                 power_supply_unregister(mbc->adapter);
 431                 ret = PTR_ERR(mbc->usb);
 432                 return ret;
 433         }
 434
 435         mbc->ac = power_supply_register(&pdev->dev, &pcf50633_mbc_ac_desc,
 436                                         &psy_cfg);
 437         if (IS_ERR(mbc->ac)) {
 438                 dev_err(mbc->pcf->dev, "failed to register ac\n");
 439                 power_supply_unregister(mbc->adapter);
 440                 power_supply_unregister(mbc->usb);
 441                 ret = PTR_ERR(mbc->ac);
 442                 return ret;
 443         }
 444
 445         ret = sysfs_create_group(&pdev->dev.kobj, &mbc_attr_group);
 446         if (ret)
 447                 dev_err(mbc->pcf->dev, "failed to create sysfs entries\n");
 448
 449         mbcs1 = pcf50633_reg_read(mbc->pcf, PCF50633_REG_MBCS1);
 450         if (mbcs1 & PCF50633_MBCS1_USBPRES)
 451                 pcf50633_mbc_irq_handler(PCF50633_IRQ_USBINS, mbc);
 452         if (mbcs1 & PCF50633_MBCS1_ADAPTPRES)
 453                 pcf50633_mbc_irq_handler(PCF50633_IRQ_ADPINS, mbc);
 454
 455         return 0;
 456 }
 457
 458 static int pcf50633_mbc_remove(struct platform_device *pdev)
 459 {
 460         struct pcf50633_mbc *mbc = platform_get_drvdata(pdev);
 461         int i;
 462
 463         /* Remove IRQ handlers */
 464         for (i = 0; i < ARRAY_SIZE(mbc_irq_handlers); i++)
 465                 pcf50633_free_irq(mbc->pcf, mbc_irq_handlers[i]);
 466
 467         sysfs_remove_group(&pdev->dev.kobj, &mbc_attr_group);
 468         power_supply_unregister(mbc->usb);
 469         power_supply_unregister(mbc->adapter);
 470         power_supply_unregister(mbc->ac);
 471
 472         return 0;
 473 }
 474
 475 static struct platform_driver pcf50633_mbc_driver = {
 476         .driver = {
 477                 .name = "pcf50633-mbc",
 478         },
 479         .probe = pcf50633_mbc_probe,
 480         .remove = pcf50633_mbc_remove,
 481 };
 482
 483 module_platform_driver(pcf50633_mbc_driver);
 484
 485 MODULE_AUTHOR("Balaji Rao <balajirrao@openmoko.org>");
 486 MODULE_DESCRIPTION("PCF50633 mbc driver");
 487 MODULE_LICENSE("GPL");
 488 MODULE_ALIAS("platform:pcf50633-mbc");