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
  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
  47         if (ma >= 1000)
  48                 bits = PCF50633_MBCC7_USB_1000mA;
  49         else if (ma >= 500)
  50                 bits = PCF50633_MBCC7_USB_500mA;
  51         else if (ma >= 100)
  52                 bits = PCF50633_MBCC7_USB_100mA;
  53         else
  54                 bits = PCF50633_MBCC7_USB_SUSPEND;
  55
  56         ret = pcf50633_reg_set_bit_mask(pcf, PCF50633_REG_MBCC7,
  57                                         PCF50633_MBCC7_USB_MASK, bits);
  58         if (ret)
  59                 dev_err(pcf->dev, "error setting usb curlim to %d mA\n", ma);
  60         else
  61                 dev_info(pcf->dev, "usb curlim to %d mA\n", ma);
  62
  63         power_supply_changed(&mbc->usb);
  64
  65         return ret;
  66 }
  67 EXPORT_SYMBOL_GPL(pcf50633_mbc_usb_curlim_set);
  68
  69 int pcf50633_mbc_get_status(struct pcf50633 *pcf)
  70 {
  71         struct pcf50633_mbc *mbc  = platform_get_drvdata(pcf->mbc_pdev);
  72         int status = 0;
  73
  74         if (mbc->usb_online)
  75                 status |= PCF50633_MBC_USB_ONLINE;
  76         if (mbc->usb_active)
  77                 status |= PCF50633_MBC_USB_ACTIVE;
  78         if (mbc->adapter_online)
  79                 status |= PCF50633_MBC_ADAPTER_ONLINE;
  80         if (mbc->adapter_active)
  81                 status |= PCF50633_MBC_ADAPTER_ACTIVE;
  82
  83         return status;
  84 }
  85 EXPORT_SYMBOL_GPL(pcf50633_mbc_get_status);
  86
  87 void pcf50633_mbc_set_status(struct pcf50633 *pcf, int what, int status)
  88 {
  89         struct pcf50633_mbc *mbc = platform_get_drvdata(pcf->mbc_pdev);
  90
  91         if (what & PCF50633_MBC_USB_ONLINE)
  92                 mbc->usb_online = !!status;
  93         if (what & PCF50633_MBC_USB_ACTIVE)
  94                 mbc->usb_active = !!status;
  95         if (what & PCF50633_MBC_ADAPTER_ONLINE)
  96                 mbc->adapter_online = !!status;
  97         if (what & PCF50633_MBC_ADAPTER_ACTIVE)
  98                 mbc->adapter_active = !!status;
  99 }
 100 EXPORT_SYMBOL_GPL(pcf50633_mbc_set_status);
 101
 102 static ssize_t
 103 show_chgmode(struct device *dev, struct device_attribute *attr, char *buf)
 104 {
 105         struct pcf50633_mbc *mbc = dev_get_drvdata(dev);
 106
 107         u8 mbcs2 = pcf50633_reg_read(mbc->pcf, PCF50633_REG_MBCS2);
 108         u8 chgmod = (mbcs2 & PCF50633_MBCS2_MBC_MASK);
 109
 110         return sprintf(buf, "%d\n", chgmod);
 111 }
 112 static DEVICE_ATTR(chgmode, S_IRUGO, show_chgmode, NULL);
 113
 114 static ssize_t
 115 show_usblim(struct device *dev, struct device_attribute *attr, char *buf)
 116 {
 117         struct pcf50633_mbc *mbc = dev_get_drvdata(dev);
 118         u8 usblim = pcf50633_reg_read(mbc->pcf, PCF50633_REG_MBCC7) &
 119                                                 PCF50633_MBCC7_USB_MASK;
 120         unsigned int ma;
 121
 122         if (usblim == PCF50633_MBCC7_USB_1000mA)
 123                 ma = 1000;
 124         else if (usblim == PCF50633_MBCC7_USB_500mA)
 125                 ma = 500;
 126         else if (usblim == PCF50633_MBCC7_USB_100mA)
 127                 ma = 100;
 128         else
 129                 ma = 0;
 130
 131         return sprintf(buf, "%u\n", ma);
 132 }
 133
 134 static ssize_t set_usblim(struct device *dev,
 135                 struct device_attribute *attr, const char *buf, size_t count)
 136 {
 137         struct pcf50633_mbc *mbc = dev_get_drvdata(dev);
 138         unsigned long ma;
 139         int ret;
 140
 141         ret = strict_strtoul(buf, 10, &ma);
 142         if (ret)
 143                 return -EINVAL;
 144
 145         pcf50633_mbc_usb_curlim_set(mbc->pcf, ma);
 146
 147         return count;
 148 }
 149
 150 static DEVICE_ATTR(usb_curlim, S_IRUGO | S_IWUSR, show_usblim, set_usblim);
 151
 152 static struct attribute *pcf50633_mbc_sysfs_entries[] = {
 153         &dev_attr_chgmode.attr,
 154         &dev_attr_usb_curlim.attr,
 155         NULL,
 156 };
 157
 158 static struct attribute_group mbc_attr_group = {
 159         .name   = NULL,                 /* put in device directory */
 160         .attrs  = pcf50633_mbc_sysfs_entries,
 161 };
 162
 163 static void
 164 pcf50633_mbc_irq_handler(int irq, void *data)
 165 {
 166         struct pcf50633_mbc *mbc = data;
 167
 168         /* USB */
 169         if (irq == PCF50633_IRQ_USBINS) {
 170                 mbc->usb_online = 1;
 171         } else if (irq == PCF50633_IRQ_USBREM) {
 172                 mbc->usb_online = 0;
 173                 mbc->usb_active = 0;
 174                 pcf50633_mbc_usb_curlim_set(mbc->pcf, 0);
 175         }
 176
 177         /* Adapter */
 178         if (irq == PCF50633_IRQ_ADPINS) {
 179                 mbc->adapter_online = 1;
 180                 mbc->adapter_active = 1;
 181         } else if (irq == PCF50633_IRQ_ADPREM) {
 182                 mbc->adapter_online = 0;
 183                 mbc->adapter_active = 0;
 184         }
 185
 186         if (irq == PCF50633_IRQ_BATFULL) {
 187                 mbc->usb_active = 0;
 188                 mbc->adapter_active = 0;
 189         }
 190
 191         power_supply_changed(&mbc->usb);
 192         power_supply_changed(&mbc->adapter);
 193
 194         if (mbc->pcf->pdata->mbc_event_callback)
 195                 mbc->pcf->pdata->mbc_event_callback(mbc->pcf, irq);
 196 }
 197
 198 static int adapter_get_property(struct power_supply *psy,
 199                         enum power_supply_property psp,
 200                         union power_supply_propval *val)
 201 {
 202         struct pcf50633_mbc *mbc = container_of(psy, struct pcf50633_mbc, usb);
 203         int ret = 0;
 204
 205         switch (psp) {
 206         case POWER_SUPPLY_PROP_ONLINE:
 207                 val->intval =  mbc->adapter_online;
 208                 break;
 209         default:
 210                 ret = -EINVAL;
 211                 break;
 212         }
 213         return ret;
 214 }
 215
 216 static int usb_get_property(struct power_supply *psy,
 217                         enum power_supply_property psp,
 218                         union power_supply_propval *val)
 219 {
 220         struct pcf50633_mbc *mbc = container_of(psy, struct pcf50633_mbc, usb);
 221         int ret = 0;
 222
 223         switch (psp) {
 224         case POWER_SUPPLY_PROP_ONLINE:
 225                 val->intval = mbc->usb_online;
 226                 break;
 227         default:
 228                 ret = -EINVAL;
 229                 break;
 230         }
 231         return ret;
 232 }
 233
 234 static enum power_supply_property power_props[] = {
 235         POWER_SUPPLY_PROP_ONLINE,
 236 };
 237
 238 static const u8 mbc_irq_handlers[] = {
 239         PCF50633_IRQ_ADPINS,
 240         PCF50633_IRQ_ADPREM,
 241         PCF50633_IRQ_USBINS,
 242         PCF50633_IRQ_USBREM,
 243         PCF50633_IRQ_BATFULL,
 244         PCF50633_IRQ_CHGHALT,
 245         PCF50633_IRQ_THLIMON,
 246         PCF50633_IRQ_THLIMOFF,
 247         PCF50633_IRQ_USBLIMON,
 248         PCF50633_IRQ_USBLIMOFF,
 249         PCF50633_IRQ_LOWSYS,
 250         PCF50633_IRQ_LOWBAT,
 251 };
 252
 253 static int __devinit pcf50633_mbc_probe(struct platform_device *pdev)
 254 {
 255         struct pcf50633_mbc *mbc;
 256         struct pcf50633_subdev_pdata *pdata = pdev->dev.platform_data;
 257         int ret;
 258         int i;
 259         u8 mbcs1;
 260
 261         mbc = kzalloc(sizeof(*mbc), GFP_KERNEL);
 262         if (!mbc)
 263                 return -ENOMEM;
 264
 265         platform_set_drvdata(pdev, mbc);
 266         mbc->pcf = pdata->pcf;
 267
 268         /* Set up IRQ handlers */
 269         for (i = 0; i < ARRAY_SIZE(mbc_irq_handlers); i++)
 270                 pcf50633_register_irq(mbc->pcf, mbc_irq_handlers[i],
 271                                         pcf50633_mbc_irq_handler, mbc);
 272
 273         /* Create power supplies */
 274         mbc->adapter.name               = "adapter";
 275         mbc->adapter.type               = POWER_SUPPLY_TYPE_MAINS;
 276         mbc->adapter.properties         = power_props;
 277         mbc->adapter.num_properties     = ARRAY_SIZE(power_props);
 278         mbc->adapter.get_property       = &adapter_get_property;
 279         mbc->adapter.supplied_to        = mbc->pcf->pdata->batteries;
 280         mbc->adapter.num_supplicants    = mbc->pcf->pdata->num_batteries;
 281
 282         mbc->usb.name                   = "usb";
 283         mbc->usb.type                   = POWER_SUPPLY_TYPE_USB;
 284         mbc->usb.properties             = power_props;
 285         mbc->usb.num_properties         = ARRAY_SIZE(power_props);
 286         mbc->usb.get_property           = usb_get_property;
 287         mbc->usb.supplied_to            = mbc->pcf->pdata->batteries;
 288         mbc->usb.num_supplicants        = mbc->pcf->pdata->num_batteries;
 289
 290         ret = power_supply_register(&pdev->dev, &mbc->adapter);
 291         if (ret) {
 292                 dev_err(mbc->pcf->dev, "failed to register adapter\n");
 293                 kfree(mbc);
 294                 return ret;
 295         }
 296
 297         ret = power_supply_register(&pdev->dev, &mbc->usb);
 298         if (ret) {
 299                 dev_err(mbc->pcf->dev, "failed to register usb\n");
 300                 power_supply_unregister(&mbc->adapter);
 301                 kfree(mbc);
 302                 return ret;
 303         }
 304
 305         ret = sysfs_create_group(&pdev->dev.kobj, &mbc_attr_group);
 306         if (ret)
 307                 dev_err(mbc->pcf->dev, "failed to create sysfs entries\n");
 308
 309         mbcs1 = pcf50633_reg_read(mbc->pcf, PCF50633_REG_MBCS1);
 310         if (mbcs1 & PCF50633_MBCS1_USBPRES)
 311                 pcf50633_mbc_irq_handler(PCF50633_IRQ_USBINS, mbc);
 312         if (mbcs1 & PCF50633_MBCS1_ADAPTPRES)
 313                 pcf50633_mbc_irq_handler(PCF50633_IRQ_ADPINS, mbc);
 314
 315         return 0;
 316 }
 317
 318 static int __devexit pcf50633_mbc_remove(struct platform_device *pdev)
 319 {
 320         struct pcf50633_mbc *mbc = platform_get_drvdata(pdev);
 321         int i;
 322
 323         /* Remove IRQ handlers */
 324         for (i = 0; i < ARRAY_SIZE(mbc_irq_handlers); i++)
 325                 pcf50633_free_irq(mbc->pcf, mbc_irq_handlers[i]);
 326
 327         power_supply_unregister(&mbc->usb);
 328         power_supply_unregister(&mbc->adapter);
 329
 330         kfree(mbc);
 331
 332         return 0;
 333 }
 334
 335 static struct platform_driver pcf50633_mbc_driver = {
 336         .driver = {
 337                 .name = "pcf50633-mbc",
 338         },
 339         .probe = pcf50633_mbc_probe,
 340         .remove = __devexit_p(pcf50633_mbc_remove),
 341 };
 342
 343 static int __init pcf50633_mbc_init(void)
 344 {
 345         return platform_driver_register(&pcf50633_mbc_driver);
 346 }
 347 module_init(pcf50633_mbc_init);
 348
 349 static void __exit pcf50633_mbc_exit(void)
 350 {
 351         platform_driver_unregister(&pcf50633_mbc_driver);
 352 }
 353 module_exit(pcf50633_mbc_exit);
 354
 355 MODULE_AUTHOR("Balaji Rao <balajirrao@openmoko.org>");
 356 MODULE_DESCRIPTION("PCF50633 mbc driver");
 357 MODULE_LICENSE("GPL");
 358 MODULE_ALIAS("platform:pcf50633-mbc");