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authorHans de Goede <hdegoede@redhat.com>2015-01-11 19:58:03 +0100
committerHans de Goede <hdegoede@redhat.com>2015-01-14 14:56:40 +0100
commit2abac6213d9d05c34fba7dcaa2934668774008a7 (patch)
tree4232558f135a6f0fd620c11f6d4650de087ceb09
parent3c781190d11ca44752562867d76ccfb8d0a45ac3 (diff)
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sunxi: axp221: Add support for controlling the drivebus pin
The axp221 / axp223's N_VBUSEN pin can be configured as an output rather then an input, add axp_drivebus_enable() and _disable() functions to set the pin in output mode and control it. Signed-off-by: Hans de Goede <hdegoede@redhat.com> Acked-by: Ian Campbell <ijc@hellion.org.uk>
-rw-r--r--drivers/power/axp221.c36
-rw-r--r--include/axp221.h9
2 files changed, 45 insertions, 0 deletions
diff --git a/drivers/power/axp221.c b/drivers/power/axp221.c
index 728727b..4c86f09 100644
--- a/drivers/power/axp221.c
+++ b/drivers/power/axp221.c
@@ -353,3 +353,39 @@ int axp221_get_sid(unsigned int *sid)
return 0;
}
+
+static int axp_drivebus_setup(void)
+{
+ int ret;
+
+ ret = axp221_init();
+ if (ret)
+ return ret;
+
+ /* Set N_VBUSEN pin to output / DRIVEBUS function */
+ return axp221_clrbits(AXP221_MISC_CTRL, AXP221_MISC_CTRL_N_VBUSEN_FUNC);
+}
+
+int axp_drivebus_enable(void)
+{
+ int ret;
+
+ ret = axp_drivebus_setup();
+ if (ret)
+ return ret;
+
+ /* Set DRIVEBUS high */
+ return axp221_setbits(AXP221_VBUS_IPSOUT, AXP221_VBUS_IPSOUT_DRIVEBUS);
+}
+
+int axp_drivebus_disable(void)
+{
+ int ret;
+
+ ret = axp_drivebus_setup();
+ if (ret)
+ return ret;
+
+ /* Set DRIVEBUS low */
+ return axp221_clrbits(AXP221_VBUS_IPSOUT, AXP221_VBUS_IPSOUT_DRIVEBUS);
+}
diff --git a/include/axp221.h b/include/axp221.h
index e9552f6..e6639f1 100644
--- a/include/axp221.h
+++ b/include/axp221.h
@@ -45,11 +45,18 @@
#define AXP221_ALDO1_CTRL 0x28
#define AXP221_ALDO2_CTRL 0x29
#define AXP221_ALDO3_CTRL 0x2a
+#define AXP221_VBUS_IPSOUT 0x30
+#define AXP221_VBUS_IPSOUT_DRIVEBUS (1 << 2)
+#define AXP221_MISC_CTRL 0x8f
+#define AXP221_MISC_CTRL_N_VBUSEN_FUNC (1 << 4)
#define AXP221_PAGE 0xff
/* Page 1 addresses */
#define AXP221_SID 0x20
+/* We support drivebus control */
+#define AXP_DRIVEBUS
+
int axp221_set_dcdc1(unsigned int mvolt);
int axp221_set_dcdc2(unsigned int mvolt);
int axp221_set_dcdc3(unsigned int mvolt);
@@ -64,3 +71,5 @@ int axp221_set_aldo2(unsigned int mvolt);
int axp221_set_aldo3(unsigned int mvolt);
int axp221_init(void);
int axp221_get_sid(unsigned int *sid);
+int axp_drivebus_enable(void);
+int axp_drivebus_disable(void);