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|
/* 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/slab.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_online;
int usb_online;
struct power_supply usb;
struct power_supply adapter;
struct power_supply ac;
};
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;
unsigned int mbcc5;
if (ma >= 1000) {
bits = PCF50633_MBCC7_USB_1000mA;
ma = 1000;
} else if (ma >= 500) {
bits = PCF50633_MBCC7_USB_500mA;
ma = 500;
} else if (ma >= 100) {
bits = PCF50633_MBCC7_USB_100mA;
ma = 100;
} else {
bits = PCF50633_MBCC7_USB_SUSPEND;
charging_start = 0;
ma = 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);
/*
* We limit the charging current to be the USB current limit.
* The reason is that on pcf50633, when it enters PMU Standby mode,
* which it does when the device goes "off", the USB current limit
* reverts to the variant default. In at least one common case, that
* default is 500mA. By setting the charging current to be the same
* as the USB limit we set here before PMU standby, we enforce it only
* using the correct amount of current even when the USB current limit
* gets reset to the wrong thing
*/
if (mbc->pcf->pdata->charger_reference_current_ma) {
mbcc5 = (ma << 8) / mbc->pcf->pdata->charger_reference_current_ma;
if (mbcc5 > 255)
mbcc5 = 255;
pcf50633_reg_write(mbc->pcf, PCF50633_REG_MBCC5, mbcc5);
}
mbcs2 = pcf50633_reg_read(mbc->pcf, PCF50633_REG_MBCS2);
chgmod = (mbcs2 & PCF50633_MBCS2_MBC_MASK);
/* If chgmod == BATFULL, setting chgena has no effect.
* Datasheet says we need to set resume instead but when autoresume is
* used resume doesn't work. Clear and set chgena 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_clear_bits(pcf, PCF50633_REG_MBCC1,
PCF50633_MBCC1_CHGENA);
pcf50633_reg_set_bit_mask(pcf, PCF50633_REG_MBCC1,
PCF50633_MBCC1_CHGENA, PCF50633_MBCC1_CHGENA);
}
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;
u8 chgmod;
if (!mbc)
return 0;
chgmod = pcf50633_reg_read(mbc->pcf, PCF50633_REG_MBCS2)
& PCF50633_MBCS2_MBC_MASK;
if (mbc->usb_online)
status |= PCF50633_MBC_USB_ONLINE;
if (chgmod == PCF50633_MBCS2_MBC_USB_PRE ||
chgmod == PCF50633_MBCS2_MBC_USB_PRE_WAIT ||
chgmod == PCF50633_MBCS2_MBC_USB_FAST ||
chgmod == PCF50633_MBCS2_MBC_USB_FAST_WAIT)
status |= PCF50633_MBC_USB_ACTIVE;
if (mbc->adapter_online)
status |= PCF50633_MBC_ADAPTER_ONLINE;
if (chgmod == PCF50633_MBCS2_MBC_ADP_PRE ||
chgmod == PCF50633_MBCS2_MBC_ADP_PRE_WAIT ||
chgmod == PCF50633_MBCS2_MBC_ADP_FAST ||
chgmod == PCF50633_MBCS2_MBC_ADP_FAST_WAIT)
status |= PCF50633_MBC_ADAPTER_ACTIVE;
return status;
}
EXPORT_SYMBOL_GPL(pcf50633_mbc_get_status);
int pcf50633_mbc_get_usb_online_status(struct pcf50633 *pcf)
{
struct pcf50633_mbc *mbc = platform_get_drvdata(pcf->mbc_pdev);
if (!mbc)
return 0;
return mbc->usb_online;
}
EXPORT_SYMBOL_GPL(pcf50633_mbc_get_usb_online_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 = kstrtoul(buf, 10, &ma);
if (ret)
return ret;
pcf50633_mbc_usb_curlim_set(mbc->pcf, ma);
return count;
}
static DEVICE_ATTR(usb_curlim, S_IRUGO | S_IWUSR, show_usblim, set_usblim);
static ssize_t
show_chglim(struct device *dev, struct device_attribute *attr, char *buf)
{
struct pcf50633_mbc *mbc = dev_get_drvdata(dev);
u8 mbcc5 = pcf50633_reg_read(mbc->pcf, PCF50633_REG_MBCC5);
unsigned int ma;
if (!mbc->pcf->pdata->charger_reference_current_ma)
return -ENODEV;
ma = (mbc->pcf->pdata->charger_reference_current_ma * mbcc5) >> 8;
return sprintf(buf, "%u\n", ma);
}
static ssize_t set_chglim(struct device *dev,
struct device_attribute *attr, const char *buf, size_t count)
{
struct pcf50633_mbc *mbc = dev_get_drvdata(dev);
unsigned long ma;
unsigned int mbcc5;
int ret;
if (!mbc->pcf->pdata->charger_reference_current_ma)
return -ENODEV;
ret = kstrtoul(buf, 10, &ma);
if (ret)
return ret;
mbcc5 = (ma << 8) / mbc->pcf->pdata->charger_reference_current_ma;
if (mbcc5 > 255)
mbcc5 = 255;
pcf50633_reg_write(mbc->pcf, PCF50633_REG_MBCC5, mbcc5);
return count;
}
/*
* This attribute allows to change MBC charging limit on the fly
* independently of usb current limit. It also gets set automatically every
* time usb current limit is changed.
*/
static DEVICE_ATTR(chg_curlim, S_IRUGO | S_IWUSR, show_chglim, set_chglim);
static struct attribute *pcf50633_mbc_sysfs_entries[]
|