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pcf50633: Get rid of charging restart software auto-triggering 

After reaching Battery Full condition MBC state machine switches back
into charging mode when the battery voltage falls below 96% of a
battery float voltage. 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 75-80%.

That is a desired behaviour recommended by battery manufacturers,
don't mess with it.

Signed-off-by: Paul Fertser <fercerpav@gmail.com>
Signed-off-by: Anton Vorontsov <cbouatmailru@gmail.com>
This commit is contained in:
Paul Fertser 2009-11-05 00:24:57 +03:00 committed by Anton Vorontsov
parent 31b4ff06e0
commit e98c73a24f
2 changed files with 0 additions and 48 deletions
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46
drivers/power/pcf50633-charger.c
View File

@ -37,8 +37,6 @@ struct pcf50633_mbc {
struct power_supply usb;
struct power_supply adapter;
struct power_supply ac;
struct delayed_work charging_restart_work;
};
int pcf50633_mbc_usb_curlim_set(struct pcf50633 *pcf, int ma)
@ -236,44 +234,10 @@ static struct attribute_group mbc_attr_group = {
.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) {
@ -282,7 +246,6 @@ pcf50633_mbc_irq_handler(int irq, void *data)
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 */
@ -297,10 +260,6 @@ pcf50633_mbc_irq_handler(int irq, void *data)
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)
@ -463,9 +422,6 @@ static int __devinit pcf50633_mbc_probe(struct platform_device *pdev)
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");
@ -492,8 +448,6 @@ static int __devexit pcf50633_mbc_remove(struct platform_device *pdev)
power_supply_unregister(&mbc->adapter);
power_supply_unregister(&mbc->ac);
cancel_delayed_work_sync(&mbc->charging_restart_work);
kfree(mbc);
return 0;

2
include/linux/mfd/pcf50633/core.h
View File

@ -29,8 +29,6 @@ struct pcf50633_platform_data {
char **batteries;
int num_batteries;
int charging_restart_interval;
/*
* Should be set accordingly to the reference resistor used, see
* I_{ch(ref)} charger reference current in the pcf50633 User