power: pm8921-charger: OVP_FET control for USBIN drop error
In some case, USBIN voltage doesn't drop for a while when
usb cable is unplugged. Due to this error, charger cannot
be detected correctly. This patch introduce OVP_FET
off method to drop USBIN volatge in error case.
Change-Id: I8d279cc8b4e7a489e8bfdc86b2015ff45704f832
diff --git a/drivers/power/pm8921-charger.c b/drivers/power/pm8921-charger.c
index aac3221..55fec15 100644
--- a/drivers/power/pm8921-charger.c
+++ b/drivers/power/pm8921-charger.c
@@ -274,6 +274,7 @@
struct delayed_work update_heartbeat_work;
struct delayed_work eoc_work;
struct delayed_work unplug_check_work;
+ struct delayed_work unplug_usbcheck_work;
struct delayed_work vin_collapse_check_work;
struct wake_lock eoc_wake_lock;
enum pm8921_chg_cold_thr cold_thr;
@@ -2855,6 +2856,27 @@
return IRQ_HANDLED;
}
+static void unplug_usbcheck_work(struct work_struct *work)
+{
+ int usb_vin;
+ struct pm8xxx_adc_chan_result vchg;
+ struct delayed_work *dwork = to_delayed_work(work);
+ struct pm8921_chg_chip *chip = container_of(dwork,
+ struct pm8921_chg_chip, unplug_usbcheck_work);
+
+ pm8xxx_adc_read(CHANNEL_USBIN, &vchg);
+ usb_vin = vchg.physical;
+ pr_info("usb_vin : %d, max_voltage_mv=%d\n", usb_vin, chip->max_voltage_mv);
+
+ if (usb_vin/1000 <= chip->max_voltage_mv) {
+ unplug_ovp_fet_open(chip);
+ }
+ pr_debug(" Notify USB update here \n");
+ power_supply_changed(&chip->batt_psy);
+ power_supply_changed(&chip->usb_psy);
+ power_supply_changed(&chip->dc_psy);
+}
+
static irqreturn_t chg_gone_irq_handler(int irq, void *data)
{
struct pm8921_chg_chip *chip = data;
@@ -2863,8 +2885,16 @@
usb_chg_plugged_in = is_usb_chg_plugged_in(chip);
chg_gone = pm_chg_get_rt_status(chip, CHG_GONE_IRQ);
- pr_debug("chg_gone=%d, usb_valid = %d\n", chg_gone, usb_chg_plugged_in);
- pr_debug("Chg gone fsm_state=%d\n", pm_chg_get_fsm_state(data));
+ pr_info("chg_gone=%d, usb_valid = %d\n", chg_gone, usb_chg_plugged_in);
+ pr_info("Chg gone fsm_state=%d\n", pm_chg_get_fsm_state(data));
+
+ if (chg_gone && usb_chg_plugged_in) {
+ pr_info("schedule to check again here\n");
+ /* schedule to check again later */
+ schedule_delayed_work(&chip->unplug_usbcheck_work,
+ round_jiffies_relative(msecs_to_jiffies
+ (UNPLUG_CHECK_WAIT_PERIOD_MS)));
+ }
power_supply_changed(&chip->batt_psy);
power_supply_changed(&chip->usb_psy);
@@ -4448,6 +4478,7 @@
INIT_DELAYED_WORK(&chip->vin_collapse_check_work,
vin_collapse_check_worker);
INIT_DELAYED_WORK(&chip->unplug_check_work, unplug_check_worker);
+ INIT_DELAYED_WORK(&chip->unplug_usbcheck_work, unplug_usbcheck_work);
rc = request_irqs(chip, pdev);
if (rc) {