474 lines
12 KiB
C
474 lines
12 KiB
C
// SPDX-License-Identifier: GPL-2.0-or-later
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/* NXP PCF50633 Main Battery Charger Driver
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*
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* (C) 2006-2008 by Openmoko, Inc.
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* Author: Balaji Rao <balajirrao@openmoko.org>
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* All rights reserved.
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*
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* Broken down from monstrous PCF50633 driver mainly by
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* Harald Welte, Andy Green and Werner Almesberger
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*/
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#include <linux/kernel.h>
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#include <linux/module.h>
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#include <linux/slab.h>
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#include <linux/init.h>
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#include <linux/types.h>
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#include <linux/device.h>
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#include <linux/sysfs.h>
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#include <linux/platform_device.h>
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#include <linux/power_supply.h>
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#include <linux/mfd/pcf50633/core.h>
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#include <linux/mfd/pcf50633/mbc.h>
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struct pcf50633_mbc {
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struct pcf50633 *pcf;
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int adapter_online;
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int usb_online;
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struct power_supply *usb;
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struct power_supply *adapter;
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struct power_supply *ac;
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};
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int pcf50633_mbc_usb_curlim_set(struct pcf50633 *pcf, int ma)
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{
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struct pcf50633_mbc *mbc = platform_get_drvdata(pcf->mbc_pdev);
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int ret = 0;
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u8 bits;
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u8 mbcs2, chgmod;
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unsigned int mbcc5;
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if (ma >= 1000) {
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bits = PCF50633_MBCC7_USB_1000mA;
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ma = 1000;
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} else if (ma >= 500) {
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bits = PCF50633_MBCC7_USB_500mA;
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ma = 500;
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} else if (ma >= 100) {
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bits = PCF50633_MBCC7_USB_100mA;
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ma = 100;
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} else {
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bits = PCF50633_MBCC7_USB_SUSPEND;
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ma = 0;
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}
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ret = pcf50633_reg_set_bit_mask(pcf, PCF50633_REG_MBCC7,
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PCF50633_MBCC7_USB_MASK, bits);
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if (ret)
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dev_err(pcf->dev, "error setting usb curlim to %d mA\n", ma);
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else
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dev_info(pcf->dev, "usb curlim to %d mA\n", ma);
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/*
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* We limit the charging current to be the USB current limit.
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* The reason is that on pcf50633, when it enters PMU Standby mode,
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* which it does when the device goes "off", the USB current limit
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* reverts to the variant default. In at least one common case, that
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* default is 500mA. By setting the charging current to be the same
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* as the USB limit we set here before PMU standby, we enforce it only
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* using the correct amount of current even when the USB current limit
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* gets reset to the wrong thing
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*/
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if (mbc->pcf->pdata->charger_reference_current_ma) {
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mbcc5 = (ma << 8) / mbc->pcf->pdata->charger_reference_current_ma;
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if (mbcc5 > 255)
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mbcc5 = 255;
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pcf50633_reg_write(mbc->pcf, PCF50633_REG_MBCC5, mbcc5);
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}
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mbcs2 = pcf50633_reg_read(mbc->pcf, PCF50633_REG_MBCS2);
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chgmod = (mbcs2 & PCF50633_MBCS2_MBC_MASK);
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/* If chgmod == BATFULL, setting chgena has no effect.
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* Datasheet says we need to set resume instead but when autoresume is
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* used resume doesn't work. Clear and set chgena instead.
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*/
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if (chgmod != PCF50633_MBCS2_MBC_BAT_FULL)
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pcf50633_reg_set_bit_mask(pcf, PCF50633_REG_MBCC1,
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PCF50633_MBCC1_CHGENA, PCF50633_MBCC1_CHGENA);
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else {
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pcf50633_reg_clear_bits(pcf, PCF50633_REG_MBCC1,
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PCF50633_MBCC1_CHGENA);
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pcf50633_reg_set_bit_mask(pcf, PCF50633_REG_MBCC1,
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PCF50633_MBCC1_CHGENA, PCF50633_MBCC1_CHGENA);
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}
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power_supply_changed(mbc->usb);
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return ret;
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}
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EXPORT_SYMBOL_GPL(pcf50633_mbc_usb_curlim_set);
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int pcf50633_mbc_get_status(struct pcf50633 *pcf)
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{
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struct pcf50633_mbc *mbc = platform_get_drvdata(pcf->mbc_pdev);
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int status = 0;
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u8 chgmod;
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if (!mbc)
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return 0;
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chgmod = pcf50633_reg_read(mbc->pcf, PCF50633_REG_MBCS2)
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& PCF50633_MBCS2_MBC_MASK;
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if (mbc->usb_online)
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status |= PCF50633_MBC_USB_ONLINE;
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if (chgmod == PCF50633_MBCS2_MBC_USB_PRE ||
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chgmod == PCF50633_MBCS2_MBC_USB_PRE_WAIT ||
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chgmod == PCF50633_MBCS2_MBC_USB_FAST ||
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chgmod == PCF50633_MBCS2_MBC_USB_FAST_WAIT)
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status |= PCF50633_MBC_USB_ACTIVE;
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if (mbc->adapter_online)
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status |= PCF50633_MBC_ADAPTER_ONLINE;
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if (chgmod == PCF50633_MBCS2_MBC_ADP_PRE ||
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chgmod == PCF50633_MBCS2_MBC_ADP_PRE_WAIT ||
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chgmod == PCF50633_MBCS2_MBC_ADP_FAST ||
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chgmod == PCF50633_MBCS2_MBC_ADP_FAST_WAIT)
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status |= PCF50633_MBC_ADAPTER_ACTIVE;
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return status;
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}
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EXPORT_SYMBOL_GPL(pcf50633_mbc_get_status);
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int pcf50633_mbc_get_usb_online_status(struct pcf50633 *pcf)
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{
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struct pcf50633_mbc *mbc = platform_get_drvdata(pcf->mbc_pdev);
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if (!mbc)
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return 0;
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return mbc->usb_online;
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}
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EXPORT_SYMBOL_GPL(pcf50633_mbc_get_usb_online_status);
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static ssize_t
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show_chgmode(struct device *dev, struct device_attribute *attr, char *buf)
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{
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struct pcf50633_mbc *mbc = dev_get_drvdata(dev);
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u8 mbcs2 = pcf50633_reg_read(mbc->pcf, PCF50633_REG_MBCS2);
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u8 chgmod = (mbcs2 & PCF50633_MBCS2_MBC_MASK);
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return sprintf(buf, "%d\n", chgmod);
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}
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static DEVICE_ATTR(chgmode, S_IRUGO, show_chgmode, NULL);
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static ssize_t
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show_usblim(struct device *dev, struct device_attribute *attr, char *buf)
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{
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struct pcf50633_mbc *mbc = dev_get_drvdata(dev);
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u8 usblim = pcf50633_reg_read(mbc->pcf, PCF50633_REG_MBCC7) &
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PCF50633_MBCC7_USB_MASK;
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unsigned int ma;
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if (usblim == PCF50633_MBCC7_USB_1000mA)
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ma = 1000;
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else if (usblim == PCF50633_MBCC7_USB_500mA)
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ma = 500;
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else if (usblim == PCF50633_MBCC7_USB_100mA)
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ma = 100;
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else
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ma = 0;
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return sprintf(buf, "%u\n", ma);
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}
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static ssize_t set_usblim(struct device *dev,
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struct device_attribute *attr, const char *buf, size_t count)
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{
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struct pcf50633_mbc *mbc = dev_get_drvdata(dev);
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unsigned long ma;
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int ret;
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ret = kstrtoul(buf, 10, &ma);
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if (ret)
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return ret;
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pcf50633_mbc_usb_curlim_set(mbc->pcf, ma);
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return count;
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}
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static DEVICE_ATTR(usb_curlim, S_IRUGO | S_IWUSR, show_usblim, set_usblim);
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static ssize_t
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show_chglim(struct device *dev, struct device_attribute *attr, char *buf)
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{
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struct pcf50633_mbc *mbc = dev_get_drvdata(dev);
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u8 mbcc5 = pcf50633_reg_read(mbc->pcf, PCF50633_REG_MBCC5);
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unsigned int ma;
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if (!mbc->pcf->pdata->charger_reference_current_ma)
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return -ENODEV;
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ma = (mbc->pcf->pdata->charger_reference_current_ma * mbcc5) >> 8;
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return sprintf(buf, "%u\n", ma);
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}
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static ssize_t set_chglim(struct device *dev,
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struct device_attribute *attr, const char *buf, size_t count)
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{
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struct pcf50633_mbc *mbc = dev_get_drvdata(dev);
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unsigned long ma;
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unsigned int mbcc5;
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int ret;
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if (!mbc->pcf->pdata->charger_reference_current_ma)
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return -ENODEV;
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ret = kstrtoul(buf, 10, &ma);
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if (ret)
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return ret;
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mbcc5 = (ma << 8) / mbc->pcf->pdata->charger_reference_current_ma;
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if (mbcc5 > 255)
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mbcc5 = 255;
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pcf50633_reg_write(mbc->pcf, PCF50633_REG_MBCC5, mbcc5);
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return count;
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}
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/*
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* This attribute allows to change MBC charging limit on the fly
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* independently of usb current limit. It also gets set automatically every
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* time usb current limit is changed.
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*/
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static DEVICE_ATTR(chg_curlim, S_IRUGO | S_IWUSR, show_chglim, set_chglim);
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static struct attribute *pcf50633_mbc_sysfs_attrs[] = {
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&dev_attr_chgmode.attr,
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&dev_attr_usb_curlim.attr,
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&dev_attr_chg_curlim.attr,
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NULL,
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};
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ATTRIBUTE_GROUPS(pcf50633_mbc_sysfs);
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static void
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pcf50633_mbc_irq_handler(int irq, void *data)
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{
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struct pcf50633_mbc *mbc = data;
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/* USB */
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if (irq == PCF50633_IRQ_USBINS) {
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mbc->usb_online = 1;
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} else if (irq == PCF50633_IRQ_USBREM) {
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mbc->usb_online = 0;
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pcf50633_mbc_usb_curlim_set(mbc->pcf, 0);
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}
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/* Adapter */
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if (irq == PCF50633_IRQ_ADPINS)
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mbc->adapter_online = 1;
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else if (irq == PCF50633_IRQ_ADPREM)
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mbc->adapter_online = 0;
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power_supply_changed(mbc->ac);
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power_supply_changed(mbc->usb);
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power_supply_changed(mbc->adapter);
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if (mbc->pcf->pdata->mbc_event_callback)
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mbc->pcf->pdata->mbc_event_callback(mbc->pcf, irq);
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}
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static int adapter_get_property(struct power_supply *psy,
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enum power_supply_property psp,
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union power_supply_propval *val)
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{
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struct pcf50633_mbc *mbc = power_supply_get_drvdata(psy);
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int ret = 0;
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switch (psp) {
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case POWER_SUPPLY_PROP_ONLINE:
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val->intval = mbc->adapter_online;
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break;
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default:
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ret = -EINVAL;
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break;
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}
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return ret;
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}
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static int usb_get_property(struct power_supply *psy,
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enum power_supply_property psp,
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union power_supply_propval *val)
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{
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struct pcf50633_mbc *mbc = power_supply_get_drvdata(psy);
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int ret = 0;
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u8 usblim = pcf50633_reg_read(mbc->pcf, PCF50633_REG_MBCC7) &
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PCF50633_MBCC7_USB_MASK;
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switch (psp) {
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case POWER_SUPPLY_PROP_ONLINE:
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val->intval = mbc->usb_online &&
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(usblim <= PCF50633_MBCC7_USB_500mA);
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break;
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default:
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ret = -EINVAL;
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break;
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}
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return ret;
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}
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static int ac_get_property(struct power_supply *psy,
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enum power_supply_property psp,
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union power_supply_propval *val)
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{
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struct pcf50633_mbc *mbc = power_supply_get_drvdata(psy);
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int ret = 0;
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u8 usblim = pcf50633_reg_read(mbc->pcf, PCF50633_REG_MBCC7) &
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PCF50633_MBCC7_USB_MASK;
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switch (psp) {
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case POWER_SUPPLY_PROP_ONLINE:
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val->intval = mbc->usb_online &&
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(usblim == PCF50633_MBCC7_USB_1000mA);
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break;
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default:
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ret = -EINVAL;
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break;
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}
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return ret;
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}
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static enum power_supply_property power_props[] = {
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POWER_SUPPLY_PROP_ONLINE,
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};
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static const u8 mbc_irq_handlers[] = {
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PCF50633_IRQ_ADPINS,
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PCF50633_IRQ_ADPREM,
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PCF50633_IRQ_USBINS,
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PCF50633_IRQ_USBREM,
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PCF50633_IRQ_BATFULL,
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PCF50633_IRQ_CHGHALT,
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PCF50633_IRQ_THLIMON,
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PCF50633_IRQ_THLIMOFF,
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PCF50633_IRQ_USBLIMON,
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PCF50633_IRQ_USBLIMOFF,
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PCF50633_IRQ_LOWSYS,
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PCF50633_IRQ_LOWBAT,
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};
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static const struct power_supply_desc pcf50633_mbc_adapter_desc = {
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.name = "adapter",
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.type = POWER_SUPPLY_TYPE_MAINS,
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.properties = power_props,
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.num_properties = ARRAY_SIZE(power_props),
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.get_property = &adapter_get_property,
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};
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static const struct power_supply_desc pcf50633_mbc_usb_desc = {
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.name = "usb",
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.type = POWER_SUPPLY_TYPE_USB,
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.properties = power_props,
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.num_properties = ARRAY_SIZE(power_props),
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.get_property = usb_get_property,
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};
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static const struct power_supply_desc pcf50633_mbc_ac_desc = {
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.name = "ac",
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.type = POWER_SUPPLY_TYPE_MAINS,
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.properties = power_props,
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.num_properties = ARRAY_SIZE(power_props),
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.get_property = ac_get_property,
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};
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static int pcf50633_mbc_probe(struct platform_device *pdev)
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{
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struct power_supply_config psy_cfg = {};
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struct power_supply_config usb_psy_cfg;
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struct pcf50633_mbc *mbc;
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int i;
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u8 mbcs1;
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mbc = devm_kzalloc(&pdev->dev, sizeof(*mbc), GFP_KERNEL);
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if (!mbc)
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return -ENOMEM;
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platform_set_drvdata(pdev, mbc);
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mbc->pcf = dev_to_pcf50633(pdev->dev.parent);
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/* Set up IRQ handlers */
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for (i = 0; i < ARRAY_SIZE(mbc_irq_handlers); i++)
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pcf50633_register_irq(mbc->pcf, mbc_irq_handlers[i],
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pcf50633_mbc_irq_handler, mbc);
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psy_cfg.supplied_to = mbc->pcf->pdata->batteries;
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psy_cfg.num_supplicants = mbc->pcf->pdata->num_batteries;
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psy_cfg.drv_data = mbc;
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/* Create power supplies */
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mbc->adapter = power_supply_register(&pdev->dev,
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&pcf50633_mbc_adapter_desc,
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&psy_cfg);
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if (IS_ERR(mbc->adapter)) {
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dev_err(mbc->pcf->dev, "failed to register adapter\n");
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return PTR_ERR(mbc->adapter);
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}
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usb_psy_cfg = psy_cfg;
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usb_psy_cfg.attr_grp = pcf50633_mbc_sysfs_groups;
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mbc->usb = power_supply_register(&pdev->dev, &pcf50633_mbc_usb_desc,
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&usb_psy_cfg);
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if (IS_ERR(mbc->usb)) {
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dev_err(mbc->pcf->dev, "failed to register usb\n");
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power_supply_unregister(mbc->adapter);
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return PTR_ERR(mbc->usb);
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}
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mbc->ac = power_supply_register(&pdev->dev, &pcf50633_mbc_ac_desc,
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&psy_cfg);
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if (IS_ERR(mbc->ac)) {
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dev_err(mbc->pcf->dev, "failed to register ac\n");
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power_supply_unregister(mbc->adapter);
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power_supply_unregister(mbc->usb);
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return PTR_ERR(mbc->ac);
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}
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mbcs1 = pcf50633_reg_read(mbc->pcf, PCF50633_REG_MBCS1);
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if (mbcs1 & PCF50633_MBCS1_USBPRES)
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pcf50633_mbc_irq_handler(PCF50633_IRQ_USBINS, mbc);
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if (mbcs1 & PCF50633_MBCS1_ADAPTPRES)
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pcf50633_mbc_irq_handler(PCF50633_IRQ_ADPINS, mbc);
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return 0;
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}
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static int pcf50633_mbc_remove(struct platform_device *pdev)
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{
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struct pcf50633_mbc *mbc = platform_get_drvdata(pdev);
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int i;
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/* Remove IRQ handlers */
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for (i = 0; i < ARRAY_SIZE(mbc_irq_handlers); i++)
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pcf50633_free_irq(mbc->pcf, mbc_irq_handlers[i]);
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power_supply_unregister(mbc->usb);
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power_supply_unregister(mbc->adapter);
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power_supply_unregister(mbc->ac);
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return 0;
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}
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static struct platform_driver pcf50633_mbc_driver = {
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.driver = {
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.name = "pcf50633-mbc",
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},
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.probe = pcf50633_mbc_probe,
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.remove = pcf50633_mbc_remove,
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};
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module_platform_driver(pcf50633_mbc_driver);
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MODULE_AUTHOR("Balaji Rao <balajirrao@openmoko.org>");
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MODULE_DESCRIPTION("PCF50633 mbc driver");
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MODULE_LICENSE("GPL");
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MODULE_ALIAS("platform:pcf50633-mbc");
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