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smb347-charger: Fix battery status reporting logic for charger faults

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This patch checks for charger status register for determining the
battery charging status and reports Discharing/Charging/Not Charging/Full
accordingly.

This patch also adds the interrupt support for Safety Timer Expiration.
This interrupt is helpful in debugging the cause for charger fault.

Signed-off-by: Ramakrishna Pallala <ramakrishna.pallala@intel.com>
Acked-by: Mika Westerberg <mika.westerberg@linux.intel.com>
Signed-off-by: Anton Vorontsov <anton.vorontsov@linaro.org>
This commit is contained in:
Ramakrishna Pallala 2012-09-18 21:58:07 +05:30 committed by Anton Vorontsov
parent ec60ea5cd6
commit 1502cfe19b
1 changed files with 82 additions and 15 deletions
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97
drivers/power/smb347-charger.c
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@ -80,6 +80,7 @@
#define CFG_FAULT_IRQ_DCIN_UV BIT(2)
#define CFG_STATUS_IRQ 0x0d
#define CFG_STATUS_IRQ_TERMINATION_OR_TAPER BIT(4)
#define CFG_STATUS_IRQ_CHARGE_TIMEOUT BIT(7)
#define CFG_ADDRESS 0x0e
/* Command registers */
@ -96,6 +97,9 @@
#define IRQSTAT_C_TERMINATION_STAT BIT(0)
#define IRQSTAT_C_TERMINATION_IRQ BIT(1)
#define IRQSTAT_C_TAPER_IRQ BIT(3)
#define IRQSTAT_D 0x38
#define IRQSTAT_D_CHARGE_TIMEOUT_STAT BIT(2)
#define IRQSTAT_D_CHARGE_TIMEOUT_IRQ BIT(3)
#define IRQSTAT_E 0x39
#define IRQSTAT_E_USBIN_UV_STAT BIT(0)
#define IRQSTAT_E_USBIN_UV_IRQ BIT(1)
@ -109,8 +113,10 @@
#define STAT_B 0x3c
#define STAT_C 0x3d
#define STAT_C_CHG_ENABLED BIT(0)
#define STAT_C_HOLDOFF_STAT BIT(3)
#define STAT_C_CHG_MASK 0x06
#define STAT_C_CHG_SHIFT 1
#define STAT_C_CHG_TERM BIT(5)
#define STAT_C_CHARGER_ERROR BIT(6)
#define STAT_E 0x3f
@ -701,7 +707,7 @@ static int smb347_hw_init(struct smb347_charger *smb)
static irqreturn_t smb347_interrupt(int irq, void *data)
{
struct smb347_charger *smb = data;
unsigned int stat_c, irqstat_e, irqstat_c;
unsigned int stat_c, irqstat_c, irqstat_d, irqstat_e;
bool handled = false;
int ret;
@ -717,6 +723,12 @@ static irqreturn_t smb347_interrupt(int irq, void *data)
return IRQ_NONE;
}
ret = regmap_read(smb->regmap, IRQSTAT_D, &irqstat_d);
if (ret < 0) {
dev_warn(smb->dev, "reading IRQSTAT_D failed\n");
return IRQ_NONE;
}
ret = regmap_read(smb->regmap, IRQSTAT_E, &irqstat_e);
if (ret < 0) {
dev_warn(smb->dev, "reading IRQSTAT_E failed\n");
@ -724,13 +736,11 @@ static irqreturn_t smb347_interrupt(int irq, void *data)
}
/*
* If we get charger error we report the error back to user and
* disable charging.
* If we get charger error we report the error back to user.
* If the error is recovered charging will resume again.
*/
if (stat_c & STAT_C_CHARGER_ERROR) {
dev_err(smb->dev, "error in charger, disabling charging\n");
smb347_charging_disable(smb);
dev_err(smb->dev, "charging stopped due to charger error\n");
power_supply_changed(&smb->battery);
handled = true;
}
@ -743,6 +753,20 @@ static irqreturn_t smb347_interrupt(int irq, void *data)
if (irqstat_c & (IRQSTAT_C_TERMINATION_IRQ | IRQSTAT_C_TAPER_IRQ)) {
if (irqstat_c & IRQSTAT_C_TERMINATION_STAT)
power_supply_changed(&smb->battery);
dev_dbg(smb->dev, "going to HW maintenance mode\n");
handled = true;
}
/*
* If we got a charger timeout INT that means the charge
* full is not detected with in charge timeout value.
*/
if (irqstat_d & IRQSTAT_D_CHARGE_TIMEOUT_IRQ) {
dev_dbg(smb->dev, "total Charge Timeout INT received\n");
if (irqstat_d & IRQSTAT_D_CHARGE_TIMEOUT_STAT)
dev_warn(smb->dev, "charging stopped due to timeout\n");
power_supply_changed(&smb->battery);
handled = true;
}
@ -776,6 +800,7 @@ static int smb347_irq_set(struct smb347_charger *smb, bool enable)
* Enable/disable interrupts for:
* - under voltage
* - termination current reached
* - charger timeout
* - charger error
*/
ret = regmap_update_bits(smb->regmap, CFG_FAULT_IRQ, 0xff,
@ -784,7 +809,8 @@ static int smb347_irq_set(struct smb347_charger *smb, bool enable)
goto fail;
ret = regmap_update_bits(smb->regmap, CFG_STATUS_IRQ, 0xff,
enable ? CFG_STATUS_IRQ_TERMINATION_OR_TAPER : 0);
enable ? (CFG_STATUS_IRQ_TERMINATION_OR_TAPER |
CFG_STATUS_IRQ_CHARGE_TIMEOUT) : 0);
if (ret < 0)
goto fail;
@ -988,6 +1014,51 @@ static enum power_supply_property smb347_usb_properties[] = {
POWER_SUPPLY_PROP_CONSTANT_CHARGE_VOLTAGE,
};
static int smb347_get_charging_status(struct smb347_charger *smb)
{
int ret, status;
unsigned int val;
if (!smb347_is_ps_online(smb))
return POWER_SUPPLY_STATUS_DISCHARGING;
ret = regmap_read(smb->regmap, STAT_C, &val);
if (ret < 0)
return ret;
if ((val & STAT_C_CHARGER_ERROR) ||
(val & STAT_C_HOLDOFF_STAT)) {
/*
* set to NOT CHARGING upon charger error
* or charging has stopped.
*/
status = POWER_SUPPLY_STATUS_NOT_CHARGING;
} else {
if ((val & STAT_C_CHG_MASK) >> STAT_C_CHG_SHIFT) {
/*
* set to charging if battery is in pre-charge,
* fast charge or taper charging mode.
*/
status = POWER_SUPPLY_STATUS_CHARGING;
} else if (val & STAT_C_CHG_TERM) {
/*
* set the status to FULL if battery is not in pre
* charge, fast charge or taper charging mode AND
* charging is terminated at least once.
*/
status = POWER_SUPPLY_STATUS_FULL;
} else {
/*
* in this case no charger error or termination
* occured but charging is not in progress!!!
*/
status = POWER_SUPPLY_STATUS_NOT_CHARGING;
}
}
return status;
}
static int smb347_battery_get_property(struct power_supply *psy,
enum power_supply_property prop,
union power_supply_propval *val)
@ -1003,14 +1074,10 @@ static int smb347_battery_get_property(struct power_supply *psy,
switch (prop) {
case POWER_SUPPLY_PROP_STATUS:
if (!smb347_is_ps_online(smb)) {
val->intval = POWER_SUPPLY_STATUS_DISCHARGING;
break;
}
if (smb347_charging_status(smb))
val->intval = POWER_SUPPLY_STATUS_CHARGING;
else
val->intval = POWER_SUPPLY_STATUS_FULL;
ret = smb347_get_charging_status(smb);
if (ret < 0)
return ret;
val->intval = ret;
break;
case POWER_SUPPLY_PROP_CHARGE_TYPE: