/* NXP PCF50633 Main Battery Charger Driver * * (C) 2006-2008 by Openmoko, Inc. * Author: Balaji Rao <balajirrao@openmoko.org> * All rights reserved. * * Broken down from monstrous PCF50633 driver mainly by * Harald Welte, Andy Green and Werner Almesberger * * This program is free software; you can redistribute it and/or modify it * under the terms of the GNU General Public License as published by the * Free Software Foundation; either version 2 of the License, or (at your * option) any later version. * */ #include <linux/kernel.h> #include <linux/module.h> #include <linux/init.h> #include <linux/types.h> #include <linux/device.h> #include <linux/sysfs.h> #include <linux/platform_device.h> #include <linux/power_supply.h> #include <linux/mfd/pcf50633/core.h> #include <linux/mfd/pcf50633/mbc.h> struct pcf50633_mbc { struct pcf50633 *pcf; int adapter_active; int adapter_online; int usb_active; int usb_online; struct power_supply usb; struct power_supply adapter; struct delayed_work charging_restart_work; }; int pcf50633_mbc_usb_curlim_set(struct pcf50633 *pcf, int ma) { struct pcf50633_mbc *mbc = platform_get_drvdata(pcf->mbc_pdev); int ret = 0; u8 bits; int charging_start = 1; u8 mbcs2, chgmod; if (ma >= 1000) bits = PCF50633_MBCC7_USB_1000mA; else if (ma >= 500) bits = PCF50633_MBCC7_USB_500mA; else if (ma >= 100) bits = PCF50633_MBCC7_USB_100mA; else { bits = PCF50633_MBCC7_USB_SUSPEND; charging_start = 0; } ret = pcf50633_reg_set_bit_mask(pcf, PCF50633_REG_MBCC7, PCF50633_MBCC7_USB_MASK, bits); if (ret) dev_err(pcf->dev, "error setting usb curlim to %d mA\n", ma); else dev_info(pcf->dev, "usb curlim to %d mA\n", ma); /* Manual charging start */ mbcs2 = pcf50633_reg_read(pcf, PCF50633_REG_MBCS2); chgmod = (mbcs2 & PCF50633_MBCS2_MBC_MASK); /* If chgmod == BATFULL, setting chgena has no effect. * We need to set resume instead. */ if (chgmod != PCF50633_MBCS2_MBC_BAT_FULL) pcf50633_reg_set_bit_mask(pcf, PCF50633_REG_MBCC1, PCF50633_MBCC1_CHGENA, PCF50633_MBCC1_CHGENA); else pcf50633_reg_set_bit_mask(pcf, PCF50633_REG_MBCC1, PCF50633_MBCC1_RESUME, PCF50633_MBCC1_RESUME); mbc->usb_active = charging_start; power_supply_changed(&mbc->usb); return ret; } EXPORT_SYMBOL_GPL(pcf50633_mbc_usb_curlim_set); int pcf50633_mbc_get_status(struct pcf50633 *pcf) { struct pcf50633_mbc *mbc = platform_get_drvdata(pcf->mbc_pdev); int status = 0; if (mbc->usb_online) status |= PCF50633_MBC_USB_ONLINE; if (mbc->usb_active) status |= PCF50633_MBC_USB_ACTIVE; if (mbc->adapter_online) status |= PCF50633_MBC_ADAPTER_ONLINE; if (mbc->adapter_active) status |= PCF50633_MBC_ADAPTER_ACTIVE; return status; } EXPORT_SYMBOL_GPL(pcf50633_mbc_get_status); static ssize_t show_chgmode(struct device *dev, struct device_attribute *attr, char *buf) { struct pcf50633_mbc *mbc = dev_get_drvdata(dev); u8 mbcs2 = pcf50633_reg_read(mbc->pcf, PCF50633_REG_MBCS2); u8 chgmod = (mbcs2 & PCF50633_MBCS2_MBC_MASK); return sprintf(buf, "%d\n", chgmod); } static DEVICE_ATTR(chgmode, S_IRUGO, show_chgmode, NULL); static ssize_t show_usblim(struct device *dev, struct device_attribute *attr, char *buf) { struct pcf50633_mbc *mbc = dev_get_drvdata(dev); u8 usblim = pcf50633_reg_read(mbc->pcf, PCF50633_REG_MBCC7) & PCF50633_MBCC7_USB_MASK; unsigned int ma; if (usblim == PCF50633_MBCC7_USB_1000mA) ma = 1000; else if (usblim == PCF50633_MBCC7_USB_500mA) ma = 500; else if (usblim == PCF50633_MBCC7_USB_100mA) ma = 100; else ma = 0; return sprintf(buf, "%u\n", ma); } static ssize_t set_usblim(struct device *dev, struct device_attribute *attr, const char *buf, size_t count) { struct pcf50633_mbc *mbc = dev_get_drvdata(dev); unsigned long ma; int ret; ret = strict_strtoul(buf, 10, &ma); if (ret) return -EINVAL; pcf50633_mbc_usb_curlim_set(mbc->pcf, ma); return count; } static DEVICE_ATTR(usb_curlim, S_IRUGO | S_IWUSR, show_usblim, set_usblim); static struct attribute *pcf50633_mbc_sysfs_entries[] = { &dev_attr_chgmode.attr, &dev_attr_usb_curlim.attr, NULL, }; static struct attribute_group mbc_attr_group = { .name = NULL, /* put in device directory */ .attrs = pcf50633_mbc_sysfs_entries, }; /* MBC state machine switches into charging mode when the battery voltage * falls below 96% of a battery float voltage. But the voltage drop in Li-ion * batteries is marginal(1~2 %) till about 80% of its capacity - which means, * after a BATFULL, charging won't be restarted until 80%. * * This work_struct function restarts charging at regular intervals to make * sure we don't discharge too much */ static void pcf50633_mbc_charging_restart(struct work_struct *work) { struct pcf50633_mbc *mbc; u8 mbcs2, chgmod; mbc = container_of(work, struct pcf50633_mbc, charging_restart_work.work); mbcs2 = pcf50633_reg_read(mbc->pcf, PCF50633_REG_MBCS2); chgmod = (mbcs2 & PCF50633_MBCS2_MBC_MASK); if (chgmod != PCF50633_MBCS2_MBC_BAT_FULL) return; /* Restart charging */ pcf50633_reg_set_bit_mask(mbc->pcf, PCF50633_REG_MBCC1, PCF50633_MBCC1_RESUME, PCF50633_MBCC1_RESUME); mbc->usb_active = 1; power_supply_changed(&mbc->usb); dev_info(mbc->pcf->dev, "Charging restarted\n"); } static void pcf50633_mbc_irq_handler(int irq, void *data) { struct pcf50633_mbc *mbc = data; int chg_restart_interval = mbc->pcf->pdata->charging_restart_interval; /* USB */ if (irq == PCF50633_IRQ_USBINS) { mbc->usb_online = 1; } else if (irq == PCF50633_IRQ_USBREM) { mbc->usb_online = 0; mbc->usb_active = 0; pcf50633_mbc_usb_curlim_set(mbc->pcf, 0); cancel_delayed_work_sync(&mbc->charging_restart_work); } /* Adapter */ if (irq == PCF50633_IRQ_ADPINS) { mbc->adapter_online = 1; mbc->adapter_active = 1; } else if (irq == PCF50633_IRQ_ADPREM) { mbc->adapter_online = 0; mbc->adapter_active = 0; } if (irq == PCF50633_IRQ_BATFULL) { mbc->usb_active = 0; mbc->adapter_active = 0; if (chg_restart_interval > 0) schedule_delayed_work(&mbc->charging_restart_work, chg_restart_interval); } else if (irq == PCF50633_IRQ_USBLIMON) mbc->usb_active = 0; else if (irq == PCF50633_IRQ_USBLIMOFF) mbc->usb_active = 1; power_supply_changed(&mbc->usb); power_supply_changed(&mbc->adapter); if (mbc->pcf->pdata->mbc_event_callback) mbc->pcf->pdata->mbc_event_callback(mbc->pcf, irq); } static int adapter_get_property(struct power_supply *psy, enum power_supply_property psp, union power_supply_propval *val) { struct pcf50633_mbc *mbc = container_of(psy, struct pcf50633_mbc, adapter); int ret = 0; switch (psp) { case POWER_SUPPLY_PROP_ONLINE: val->intval = mbc->adapter_online; break; default: ret = -EINVAL; break; } return ret; } static int usb_get_property(struct power_supply *psy, enum power_supply_property psp, union power_supply_propval *val) { struct pcf50633_mbc *mbc = container_of(psy, struct pcf50633_mbc, usb); int ret = 0; switch (psp) { case POWER_SUPPLY_PROP_ONLINE: val->intval = mbc->usb_online; break; default: ret = -EINVAL; break; } return ret; } static enum power_supply_property power_props[] = { POWER_SUPPLY_PROP_ONLINE, }; static const u8 mbc_irq_handlers[] = { PCF50633_IRQ_ADPINS, PCF50633_IRQ_ADPREM, PCF50633_IRQ_USBINS, PCF50633_IRQ_USBREM, PCF50633_IRQ_BATFULL, PCF50633_IRQ_CHGHALT, PCF50633_IRQ_THLIMON, PCF50633_IRQ_THLIMOFF, PCF50633_IRQ_USBLIMON, PCF50633_IRQ_USBLIMOFF, PCF50633_IRQ_LOWSYS, PCF50633_IRQ_LOWBAT, }; static int __devinit pcf50633_mbc_probe(struct platform_device *pdev) { struct pcf50633_mbc *mbc; struct pcf50633_subdev_pdata *pdata = pdev->dev.platform_data; int ret; int i; u8 mbcs1; mbc = kzalloc(sizeof(*mbc), GFP_KERNEL); if (!mbc) return -ENOMEM; platform_set_drvdata(pdev, mbc); mbc->pcf = pdata->pcf; /* Set up IRQ handlers */ for (i = 0; i < ARRAY_SIZE(mbc_irq_handlers); i++) pcf50633_register_irq(mbc->pcf, mbc_irq_handlers[i], pcf50633_mbc_irq_handler, mbc); /* Create power supplies */ mbc->adapter.name = "adapter"; mbc->adapter.type = POWER_SUPPLY_TYPE_MAINS; mbc->adapter.properties = power_props; mbc->adapter.num_properties = ARRAY_SIZE(power_props); mbc->adapter.get_property = &adapter_get_property; mbc->adapter.supplied_to = mbc->pcf->pdata->batteries; mbc->adapter.num_supplicants = mbc->pcf->pdata->num_batteries; mbc->usb.name = "usb"; mbc->usb.type = POWER_SUPPLY_TYPE_USB; mbc->usb.properties = power_props; mbc->usb.num_properties = ARRAY_SIZE(power_props); mbc->usb.get_property = usb_get_property; mbc->usb.supplied_to = mbc->pcf->pdata->batteries; mbc->usb.num_supplicants = mbc->pcf->pdata->num_batteries; ret = power_supply_register(&pdev->dev, &mbc->adapter); if (ret) { dev_err(mbc->pcf->dev, "failed to register adapter\n"); kfree(mbc); return ret; } ret = power_supply_register(&pdev->dev, &mbc->usb); if (ret) { dev_err(mbc->pcf->dev, "failed to register usb\n"); power_supply_unregister(&mbc->adapter); kfree(mbc); return ret; } INIT_DELAYED_WORK(&mbc->charging_restart_work, pcf50633_mbc_charging_restart); ret = sysfs_create_group(&pdev->dev.kobj, &mbc_attr_group); if (ret) dev_err(mbc->pcf->dev, "failed to create sysfs entries\n"); mbcs1 = pcf50633_reg_read(mbc->pcf, PCF50633_REG_MBCS1); if (mbcs1 & PCF50633_MBCS1_USBPRES) pcf50633_mbc_irq_handler(PCF50633_IRQ_USBINS, mbc); if (mbcs1 & PCF50633_MBCS1_ADAPTPRES) pcf50633_mbc_irq_handler(PCF50633_IRQ_ADPINS, mbc); return 0; } static int __devexit pcf50633_mbc_remove(struct platform_device *pdev) { struct pcf50633_mbc *mbc = platform_get_drvdata(pdev); int i; /* Remove IRQ handlers */ for (i = 0; i < ARRAY_SIZE(mbc_irq_handlers); i++) pcf50633_free_irq(mbc->pcf, mbc_irq_handlers[i]); power_supply_unregister(&mbc->usb); power_supply_unregister(&mbc->adapter); cancel_delayed_work_sync(&mbc->charging_restart_work); kfree(mbc); return 0; } static struct platform_driver pcf50633_mbc_driver = { .driver = { .name = "pcf50633-mbc", }, .probe = pcf50633_mbc_probe, .remove = __devexit_p(pcf50633_mbc_remove), }; static int __init pcf50633_mbc_init(void) { return platform_driver_register(&pcf50633_mbc_driver); } module_init(pcf50633_mbc_init); static void __exit pcf50633_mbc_exit(void) { platform_driver_unregister(&pcf50633_mbc_driver); } module_exit(pcf50633_mbc_exit); MODULE_AUTHOR("Balaji Rao <balajirrao@openmoko.org>"); MODULE_DESCRIPTION("PCF50633 mbc driver"); MODULE_LICENSE("GPL"); MODULE_ALIAS("platform:pcf50633-mbc");