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/init.h>
  20 #include <linux/types.h>
  21 #include <linux/device.h>
  22 #include <linux/sysfs.h>
  23 #include <linux/platform_device.h>
  24 #include <linux/power_supply.h>
  25
  26 #include <linux/mfd/pcf50633/core.h>
  27 #include <linux/mfd/pcf50633/mbc.h>
  28
  29 struct pcf50633_mbc {
  30         struct pcf50633 *pcf;
  31
  32         int adapter_active;
  33         int adapter_online;
  34         int usb_active;
  35         int usb_online;
  36
  37         struct power_supply usb;
  38         struct power_supply adapter;
  39
  40         struct delayed_work charging_restart_work;
  41 };
  42
  43 int pcf50633_mbc_usb_curlim_set(struct pcf50633 *pcf, int ma)
  44 {
  45         struct pcf50633_mbc *mbc = platform_get_drvdata(pcf->mbc_pdev);
  46         int ret = 0;
  47         u8 bits;
  48         int charging_start = 1;
  49         u8 mbcs2, chgmod;
  50
  51         if (ma >= 1000)
  52                 bits = PCF50633_MBCC7_USB_1000mA;
  53         else if (ma >= 500)
  54                 bits = PCF50633_MBCC7_USB_500mA;
  55         else if (ma >= 100)
  56                 bits = PCF50633_MBCC7_USB_100mA;
  57         else {
  58                 bits = PCF50633_MBCC7_USB_SUSPEND;
  59                 charging_start = 0;
  60         }
  61
  62         ret = pcf50633_reg_set_bit_mask(pcf, PCF50633_REG_MBCC7,
  63                                         PCF50633_MBCC7_USB_MASK, bits);
  64         if (ret)
  65                 dev_err(pcf->dev, "error setting usb curlim to %d mA\n", ma);
  66         else
  67                 dev_info(pcf->dev, "usb curlim to %d mA\n", ma);
  68
  69         /* Manual charging start */
  70         mbcs2 = pcf50633_reg_read(pcf, PCF50633_REG_MBCS2);
  71         chgmod = (mbcs2 & PCF50633_MBCS2_MBC_MASK);
  72
  73         /* If chgmod == BATFULL, setting chgena has no effect.
  74          * We need to set resume instead.
  75          */
  76         if (chgmod != PCF50633_MBCS2_MBC_BAT_FULL)
  77                 pcf50633_reg_set_bit_mask(pcf, PCF50633_REG_MBCC1,
  78                                 PCF50633_MBCC1_CHGENA, PCF50633_MBCC1_CHGENA);
  79         else
  80                 pcf50633_reg_set_bit_mask(pcf, PCF50633_REG_MBCC1,
  81                                 PCF50633_MBCC1_RESUME, PCF50633_MBCC1_RESUME);
  82
  83         mbc->usb_active = charging_start;
  84
  85         power_supply_changed(&mbc->usb);
  86
  87         return ret;
  88 }
  89 EXPORT_SYMBOL_GPL(pcf50633_mbc_usb_curlim_set);
  90
  91 int pcf50633_mbc_get_status(struct pcf50633 *pcf)
  92 {
  93         struct pcf50633_mbc *mbc  = platform_get_drvdata(pcf->mbc_pdev);
  94         int status = 0;
  95
  96         if (mbc->usb_online)
  97                 status |= PCF50633_MBC_USB_ONLINE;
  98         if (mbc->usb_active)
  99                 status |= PCF50633_MBC_USB_ACTIVE;
 100         if (mbc->adapter_online)
 101                 status |= PCF50633_MBC_ADAPTER_ONLINE;
 102         if (mbc->adapter_active)
 103                 status |= PCF50633_MBC_ADAPTER_ACTIVE;
 104
 105         return status;
 106 }
 107 EXPORT_SYMBOL_GPL(pcf50633_mbc_get_status);
 108
 109 static ssize_t
 110 show_chgmode(struct device *dev, struct device_attribute *attr, char *buf)
 111 {
 112         struct pcf50633_mbc *mbc = dev_get_drvdata(dev);
 113
 114         u8 mbcs2 = pcf50633_reg_read(mbc->pcf, PCF50633_REG_MBCS2);
 115         u8 chgmod = (mbcs2 & PCF50633_MBCS2_MBC_MASK);
 116
 117         return sprintf(buf, "%d\n", chgmod);
 118 }
 119 static DEVICE_ATTR(chgmode, S_IRUGO, show_chgmode, NULL);
 120
 121 static ssize_t
 122 show_usblim(struct device *dev, struct device_attribute *attr, char *buf)
 123 {
 124         struct pcf50633_mbc *mbc = dev_get_drvdata(dev);
 125         u8 usblim = pcf50633_reg_read(mbc->pcf, PCF50633_REG_MBCC7) &
 126                                                 PCF50633_MBCC7_USB_MASK;
 127         unsigned int ma;
 128
 129         if (usblim == PCF50633_MBCC7_USB_1000mA)
 130                 ma = 1000;
 131         else if (usblim == PCF50633_MBCC7_USB_500mA)
 132                 ma = 500;
 133         else if (usblim == PCF50633_MBCC7_USB_100mA)
 134                 ma = 100;
 135         else
 136                 ma = 0;
 137
 138         return sprintf(buf, "%u\n", ma);
 139 }
 140
 141 static ssize_t set_usblim(struct device *dev,
 142                 struct device_attribute *attr, const char *buf, size_t count)
 143 {
 144         struct pcf50633_mbc *mbc = dev_get_drvdata(dev);
 145         unsigned long ma;
 146         int ret;
 147
 148         ret = strict_strtoul(buf, 10, &ma);
 149         if (ret)
 150                 return -EINVAL;
 151
 152         pcf50633_mbc_usb_curlim_set(mbc->pcf, ma);
 153
 154         return count;
 155 }
 156
 157 static DEVICE_ATTR(usb_curlim, S_IRUGO | S_IWUSR, show_usblim, set_usblim);
 158
 159 static struct attribute *pcf50633_mbc_sysfs_entries[] = {
 160         &dev_attr_chgmode.attr,
 161         &dev_attr_usb_curlim.attr,
 162         NULL,
 163 };
 164
 165 static struct attribute_group mbc_attr_group = {
 166         .name   = NULL,                 /* put in device directory */
 167         .attrs  = pcf50633_mbc_sysfs_entries,
 168 };
 169
 170 /* MBC state machine switches into charging mode when the battery voltage
 171  * falls below 96% of a battery float voltage. But the voltage drop in Li-ion
 172  * batteries is marginal(1~2 %) till about 80% of its capacity - which means,
 173  * after a BATFULL, charging won't be restarted until 80%.
 174  *
 175  * This work_struct function restarts charging at regular intervals to make
 176  * sure we don't discharge too much
 177  */
 178
 179 static void pcf50633_mbc_charging_restart(struct work_struct *work)
 180 {
 181         struct pcf50633_mbc *mbc;
 182         u8 mbcs2, chgmod;
 183
 184         mbc = container_of(work, struct pcf50633_mbc,
 185                                 charging_restart_work.work);
 186
 187         mbcs2 = pcf50633_reg_read(mbc->pcf, PCF50633_REG_MBCS2);
 188         chgmod = (mbcs2 & PCF50633_MBCS2_MBC_MASK);
 189
 190         if (chgmod != PCF50633_MBCS2_MBC_BAT_FULL)
 191                 return;
 192
 193         /* Restart charging */
 194         pcf50633_reg_set_bit_mask(mbc->pcf, PCF50633_REG_MBCC1,
 195                                 PCF50633_MBCC1_RESUME, PCF50633_MBCC1_RESUME);
 196         mbc->usb_active = 1;
 197         power_supply_changed(&mbc->usb);
 198
 199         dev_info(mbc->pcf->dev, "Charging restarted\n");
 200 }
 201
 202 static void
 203 pcf50633_mbc_irq_handler(int irq, void *data)
 204 {
 205         struct pcf50633_mbc *mbc = data;
 206         int chg_restart_interval =
 207                         mbc->pcf->pdata->charging_restart_interval;
 208
 209         /* USB */
 210         if (irq == PCF50633_IRQ_USBINS) {
 211                 mbc->usb_online = 1;
 212         } else if (irq == PCF50633_IRQ_USBREM) {
 213                 mbc->usb_online = 0;
 214                 mbc->usb_active = 0;
 215                 pcf50633_mbc_usb_curlim_set(mbc->pcf, 0);
 216                 cancel_delayed_work_sync(&mbc->charging_restart_work);
 217         }
 218
 219         /* Adapter */
 220         if (irq == PCF50633_IRQ_ADPINS) {
 221                 mbc->adapter_online = 1;
 222                 mbc->adapter_active = 1;
 223         } else if (irq == PCF50633_IRQ_ADPREM) {
 224                 mbc->adapter_online = 0;
 225                 mbc->adapter_active = 0;
 226         }
 227
 228         if (irq == PCF50633_IRQ_BATFULL) {
 229                 mbc->usb_active = 0;
 230                 mbc->adapter_active = 0;
 231
 232                 if (chg_restart_interval > 0)
 233                         schedule_delayed_work(&mbc->charging_restart_work,
 234                                                         chg_restart_interval);
 235         } else if (irq == PCF50633_IRQ_USBLIMON)
 236                 mbc->usb_active = 0;
 237         else if (irq == PCF50633_IRQ_USBLIMOFF)
 238                 mbc->usb_active = 1;
 239
 240         power_supply_changed(&mbc->usb);
 241         power_supply_changed(&mbc->adapter);
 242
 243         if (mbc->pcf->pdata->mbc_event_callback)
 244                 mbc->pcf->pdata->mbc_event_callback(mbc->pcf, irq);
 245 }
 246
 247 static int adapter_get_property(struct power_supply *psy,
 248                         enum power_supply_property psp,
 249                         union power_supply_propval *val)
 250 {
 251         struct pcf50633_mbc *mbc = container_of(psy,
 252                                 struct pcf50633_mbc, adapter);
 253         int ret = 0;
 254
 255         switch (psp) {
 256         case POWER_SUPPLY_PROP_ONLINE:
 257                 val->intval =  mbc->adapter_online;
 258                 break;
 259         default:
 260                 ret = -EINVAL;
 261                 break;
 262         }
 263         return ret;
 264 }
 265
 266 static int usb_get_property(struct power_supply *psy,
 267                         enum power_supply_property psp,
 268                         union power_supply_propval *val)
 269 {
 270         struct pcf50633_mbc *mbc = container_of(psy, struct pcf50633_mbc, usb);
 271         int ret = 0;
 272
 273         switch (psp) {
 274         case POWER_SUPPLY_PROP_ONLINE:
 275                 val->intval = mbc->usb_online;
 276                 break;
 277         default:
 278                 ret = -EINVAL;
 279                 break;
 280         }
 281         return ret;
 282 }
 283
 284 static enum power_supply_property power_props[] = {
 285         POWER_SUPPLY_PROP_ONLINE,
 286 };
 287
 288 static const u8 mbc_irq_handlers[] = {
 289         PCF50633_IRQ_ADPINS,
 290         PCF50633_IRQ_ADPREM,
 291         PCF50633_IRQ_USBINS,
 292         PCF50633_IRQ_USBREM,
 293         PCF50633_IRQ_BATFULL,
 294         PCF50633_IRQ_CHGHALT,
 295         PCF50633_IRQ_THLIMON,
 296         PCF50633_IRQ_THLIMOFF,
 297         PCF50633_IRQ_USBLIMON,
 298         PCF50633_IRQ_USBLIMOFF,
 299         PCF50633_IRQ_LOWSYS,
 300         PCF50633_IRQ_LOWBAT,
 301 };
 302
 303 static int __devinit pcf50633_mbc_probe(struct platform_device *pdev)
 304 {
 305         struct pcf50633_mbc *mbc;
 306         struct pcf50633_subdev_pdata *pdata = pdev->dev.platform_data;
 307         int ret;
 308         int i;
 309         u8 mbcs1;
 310
 311         mbc = kzalloc(sizeof(*mbc), GFP_KERNEL);
 312         if (!mbc)
 313                 return -ENOMEM;
 314
 315         platform_set_drvdata(pdev, mbc);
 316         mbc->pcf = pdata->pcf;
 317
 318         /* Set up IRQ handlers */
 319         for (i = 0; i < ARRAY_SIZE(mbc_irq_handlers); i++)
 320                 pcf50633_register_irq(mbc->pcf, mbc_irq_handlers[i],
 321                                         pcf50633_mbc_irq_handler, mbc);
 322
 323         /* Create power supplies */
 324         mbc->adapter.name               = "adapter";
 325         mbc->adapter.type               = POWER_SUPPLY_TYPE_MAINS;
 326         mbc->adapter.properties         = power_props;
 327         mbc->adapter.num_properties     = ARRAY_SIZE(power_props);
 328         mbc->adapter.get_property       = &adapter_get_property;
 329         mbc->adapter.supplied_to        = mbc->pcf->pdata->batteries;
 330         mbc->adapter.num_supplicants    = mbc->pcf->pdata->num_batteries;
 331
 332         mbc->usb.name                   = "usb";
 333         mbc->usb.type                   = POWER_SUPPLY_TYPE_USB;
 334         mbc->usb.properties             = power_props;
 335         mbc->usb.num_properties         = ARRAY_SIZE(power_props);
 336         mbc->usb.get_property           = usb_get_property;
 337         mbc->usb.supplied_to            = mbc->pcf->pdata->batteries;
 338         mbc->usb.num_supplicants        = mbc->pcf->pdata->num_batteries;
 339
 340         ret = power_supply_register(&pdev->dev, &mbc->adapter);
 341         if (ret) {
 342                 dev_err(mbc->pcf->dev, "failed to register adapter\n");
 343                 kfree(mbc);
 344                 return ret;
 345         }
 346
 347         ret = power_supply_register(&pdev->dev, &mbc->usb);
 348         if (ret) {
 349                 dev_err(mbc->pcf->dev, "failed to register usb\n");
 350                 power_supply_unregister(&mbc->adapter);
 351                 kfree(mbc);
 352                 return ret;
 353         }
 354
 355         INIT_DELAYED_WORK(&mbc->charging_restart_work,
 356                                 pcf50633_mbc_charging_restart);
 357
 358         ret = sysfs_create_group(&pdev->dev.kobj, &mbc_attr_group);
 359         if (ret)
 360                 dev_err(mbc->pcf->dev, "failed to create sysfs entries\n");
 361
 362         mbcs1 = pcf50633_reg_read(mbc->pcf, PCF50633_REG_MBCS1);
 363         if (mbcs1 & PCF50633_MBCS1_USBPRES)
 364                 pcf50633_mbc_irq_handler(PCF50633_IRQ_USBINS, mbc);
 365         if (mbcs1 & PCF50633_MBCS1_ADAPTPRES)
 366                 pcf50633_mbc_irq_handler(PCF50633_IRQ_ADPINS, mbc);
 367
 368         return 0;
 369 }
 370
 371 static int __devexit pcf50633_mbc_remove(struct platform_device *pdev)
 372 {
 373         struct pcf50633_mbc *mbc = platform_get_drvdata(pdev);
 374         int i;
 375
 376         /* Remove IRQ handlers */
 377         for (i = 0; i < ARRAY_SIZE(mbc_irq_handlers); i++)
 378                 pcf50633_free_irq(mbc->pcf, mbc_irq_handlers[i]);
 379
 380         power_supply_unregister(&mbc->usb);
 381         power_supply_unregister(&mbc->adapter);
 382
 383         cancel_delayed_work_sync(&mbc->charging_restart_work);
 384
 385         kfree(mbc);
 386
 387         return 0;
 388 }
 389
 390 static struct platform_driver pcf50633_mbc_driver = {
 391         .driver = {
 392                 .name = "pcf50633-mbc",
 393         },
 394         .probe = pcf50633_mbc_probe,
 395         .remove = __devexit_p(pcf50633_mbc_remove),
 396 };
 397
 398 static int __init pcf50633_mbc_init(void)
 399 {
 400         return platform_driver_register(&pcf50633_mbc_driver);
 401 }
 402 module_init(pcf50633_mbc_init);
 403
 404 static void __exit pcf50633_mbc_exit(void)
 405 {
 406         platform_driver_unregister(&pcf50633_mbc_driver);
 407 }
 408 module_exit(pcf50633_mbc_exit);
 409
 410 MODULE_AUTHOR("Balaji Rao <balajirrao@openmoko.org>");
 411 MODULE_DESCRIPTION("PCF50633 mbc driver");
 412 MODULE_LICENSE("GPL");
 413 MODULE_ALIAS("platform:pcf50633-mbc");