sunxi: axp221: Add VBUS detection support
Some of the AXP PMICs support VBUS detection, i.e. checking whether
VBUS power input is available and usable (supplied by an external
source). A few boards use this instead of a separate GPIO to detect
VBUS on USB OTG.
Signed-off-by: Chen-Yu Tsai <wens@csie.org>
Acked-by: Hans de Goede <hdegoede@redhat.com>
Signed-off-by: Hans de Goede <hdegoede@redhat.com>
diff --git a/drivers/power/axp221.c b/drivers/power/axp221.c
index 3e07f23..c2c3988 100644
--- a/drivers/power/axp221.c
+++ b/drivers/power/axp221.c
@@ -385,6 +385,22 @@
return 0;
}
+int axp_get_vbus(void)
+{
+ int ret;
+ u8 val;
+
+ ret = axp221_init();
+ if (ret)
+ return ret;
+
+ ret = pmic_bus_read(AXP221_POWER_STATUS, &val);
+ if (ret)
+ return ret;
+
+ return (val & AXP221_POWER_STATUS_VBUS_USABLE) ? 1 : 0;
+}
+
static int axp_drivebus_setup(void)
{
int ret;