[PATCH] smb347_charger: fix battery status reporting logic for charger faults
From: Ramakrishna Pallala
Date: Fri Jul 20 2012 - 11:16:09 EST
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@xxxxxxxxx>
---
drivers/power/smb347-charger.c | 96 +++++++++++++++++++++++++++++++++------
1 files changed, 81 insertions(+), 15 deletions(-)
diff --git a/drivers/power/smb347-charger.c b/drivers/power/smb347-charger.c
index 332dd01..b6a8c59 100644
--- a/drivers/power/smb347-charger.c
+++ b/drivers/power/smb347-charger.c
@@ -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 @@ fail:
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 recieved\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 +1014,50 @@ 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 (!smb)
+ return -ENODEV;
+
+ 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 +1073,10 @@ 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:
--
1.7.0.4
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