[v3,04/12] usb: typec: add API to get typec basic port power and data config

[Jun Li <jun.li@nxp.com>]

This patch adds 3 APIs to get the typec port power and data type,
and preferred power role.

Signed-off-by: Li Jun <jun.li@nxp.com>
---
change for v3:
- Use fwnode to get the node of usb connector.
- add one API to get data type

 drivers/usb/typec/class.c | 85 +++++++++++++++++++++++++++++++++++++++++++++++
 include/linux/usb/typec.h |  3 ++
 2 files changed, 88 insertions(+)

diff --git a/drivers/usb/typec/class.c b/drivers/usb/typec/class.c
index 53df10d..c5e937f 100644
--- a/drivers/usb/typec/class.c
+++ b/drivers/usb/typec/class.c
@@ -9,6 +9,7 @@
 #include <linux/device.h>
 #include <linux/module.h>
 #include <linux/mutex.h>
+#include <linux/property.h>
 #include <linux/slab.h>
 #include <linux/usb/typec.h>
 #include <linux/usb/typec_mux.h>
@@ -802,6 +803,12 @@ static const char * const typec_port_types[] = {
 	[TYPEC_PORT_DRP] = "dual",
 };
 
+static const char * const typec_data_types[] = {
+	[TYPEC_PORT_DFP] = "host",
+	[TYPEC_PORT_UFP] = "device",
+	[TYPEC_PORT_DRD] = "dual",
+};
+
 static const char * const typec_port_types_drp[] = {
 	[TYPEC_PORT_SRC] = "dual [source] sink",
 	[TYPEC_PORT_SNK] = "dual source [sink]",
@@ -1252,6 +1259,84 @@ void typec_set_pwr_opmode(struct typec_port *port,
 }
 EXPORT_SYMBOL_GPL(typec_set_pwr_opmode);
 
+/**
+ * typec_get_power_type - Get the typec port power type
+ * @fwnode: Firmware node to get the property of
+ *
+ * This routine is used by typec hardware driver to read property
+ * port power type from the device firmware description.
+ *
+ * Returns typec_port_type if success, otherwise negative error code.
+ */
+int typec_get_power_type(struct fwnode_handle *fwnode)
+{
+	const char *type_str;
+	int ret;
+
+	if (!fwnode)
+		return -EINVAL;
+
+	ret = fwnode_property_read_string(fwnode, "power-type", &type_str);
+	if (ret < 0)
+		return ret;
+
+	return match_string(typec_port_types, ARRAY_SIZE(typec_port_types),
+			    type_str);
+}
+EXPORT_SYMBOL_GPL(typec_get_power_type);
+
+/**
+ * typec_get_preferred_role - Get the typec preferred power role
+ * @fwnode: Firmware node to get the property of
+ *
+ * This routine is used by typec hardware driver to read property
+ * try-power-role from the device firmware description to decide
+ * if the port can support Try.SRC or Try.SNK.
+ *
+ * Returns typec_role if success, otherwise negative error code.
+ */
+int typec_get_preferred_role(struct fwnode_handle *fwnode)
+{
+	const char *type_str;
+	int ret;
+
+	if (!fwnode)
+		return -EINVAL;
+
+	ret = fwnode_property_read_string(fwnode, "try-power-role", &type_str);
+	if (ret < 0)
+		return ret;
+
+	return match_string(typec_roles, ARRAY_SIZE(typec_roles), type_str);
+}
+EXPORT_SYMBOL_GPL(typec_get_preferred_role);
+
+/**
+ * typec_get_data_type - Get the typec port data type
+ * @fwnode: Firmware node to get the property of
+ *
+ * This routine is used by typec hardware driver to read property
+ * port data type from the device firmware description.
+ *
+ * Returns typec_data_type if success, otherwise negative error code.
+ */
+int typec_get_data_type(struct fwnode_handle *fwnode)
+{
+	const char *type_str;
+	int ret;
+
+	if (!fwnode)
+		return -EINVAL;
+
+	ret = fwnode_property_read_string(fwnode, "data-type", &type_str);
+	if (ret < 0)
+		return ret;
+
+	return match_string(typec_data_types, ARRAY_SIZE(typec_data_types),
+			    type_str);
+}
+EXPORT_SYMBOL_GPL(typec_get_data_type);
+
 /* ------------------------------------------ */
 /* API for Multiplexer/DeMultiplexer Switches */
 
diff --git a/include/linux/usb/typec.h b/include/linux/usb/typec.h
index 672b39b..c415593 100644
--- a/include/linux/usb/typec.h
+++ b/include/linux/usb/typec.h
@@ -267,4 +267,7 @@ int typec_set_orientation(struct typec_port *port,
 			  enum typec_orientation orientation);
 int typec_set_mode(struct typec_port *port, int mode);
 
+int typec_get_power_type(struct fwnode_handle *fwnode);
+int typec_get_preferred_role(struct fwnode_handle *fwnode);
+int typec_get_data_type(struct fwnode_handle *fwnode);
 #endif /* __LINUX_USB_TYPEC_H */