power: pm8921-charger: Add api to control OVP
Some board configurations have different needs for usb overvoltage
thresholds and debounce time for usb detection.
Provide apis to program threshold voltage, debounce time and
disable/enable overvoltage protection.
CRs-Fixed: 324137
Change-Id: Ie618ca12be819739a623cf41e5e1198305467aa5
Signed-off-by: Abhijeet Dharmapurikar <adharmap@codeaurora.org>
diff --git a/drivers/power/pm8921-charger.c b/drivers/power/pm8921-charger.c
index 5bf9c76..ea50ae9 100644
--- a/drivers/power/pm8921-charger.c
+++ b/drivers/power/pm8921-charger.c
@@ -1334,6 +1334,69 @@
return pm_chg_vinmin_set(the_chip, voltage);
}
+#define USB_OV_THRESHOLD_MASK 0x60
+#define USB_OV_THRESHOLD_SHIFT 5
+int pm8921_usb_ovp_set_threshold(enum pm8921_usb_ov_threshold ov)
+{
+ u8 temp;
+
+ if (!the_chip) {
+ pr_err("called before init\n");
+ return -EINVAL;
+ }
+
+ if (ov > PM_USB_OV_7V) {
+ pr_err("limiting to over voltage threshold to 7volts\n");
+ ov = PM_USB_OV_7V;
+ }
+
+ temp = USB_OV_THRESHOLD_MASK & (ov << USB_OV_THRESHOLD_SHIFT);
+
+ return pm_chg_masked_write(the_chip, USB_OVP_CONTROL,
+ USB_OV_THRESHOLD_MASK, temp);
+}
+EXPORT_SYMBOL(pm8921_usb_ovp_set_threshold);
+
+#define USB_DEBOUNCE_TIME_MASK 0x06
+#define USB_DEBOUNCE_TIME_SHIFT 1
+int pm8921_usb_ovp_set_hystersis(enum pm8921_usb_debounce_time ms)
+{
+ u8 temp;
+
+ if (!the_chip) {
+ pr_err("called before init\n");
+ return -EINVAL;
+ }
+
+ if (ms > PM_USB_DEBOUNCE_80P5MS) {
+ pr_err("limiting debounce to 80.5ms\n");
+ ms = PM_USB_DEBOUNCE_80P5MS;
+ }
+
+ temp = USB_DEBOUNCE_TIME_MASK & (ms << USB_DEBOUNCE_TIME_SHIFT);
+
+ return pm_chg_masked_write(the_chip, USB_OVP_CONTROL,
+ USB_DEBOUNCE_TIME_MASK, temp);
+}
+EXPORT_SYMBOL(pm8921_usb_ovp_set_hystersis);
+
+#define USB_OVP_DISABLE_MASK 0x80
+int pm8921_usb_ovp_disable(int disable)
+{
+ u8 temp = 0;
+
+ if (!the_chip) {
+ pr_err("called before init\n");
+ return -EINVAL;
+ }
+
+ if (disable)
+ temp = USB_OVP_DISABLE_MASK;
+
+ return pm_chg_masked_write(the_chip, USB_OVP_CONTROL,
+ USB_OVP_DISABLE_MASK, temp);
+}
+
bool pm8921_is_battery_charging(int *source)
{
int fsm_state, is_charging, dc_present, usb_present;