[PATCH v3 05/12] usb: typec: add API to get sink and source config

[Li Jun <jun.li@xxxxxxx>]

This patch add 2 APIs to get sink and source power config from firmware
description in case the port supports PD.

Signed-off-by: Li Jun <jun.li@xxxxxxx>
---
 drivers/usb/typec/tcpm.c | 47 +++++++++++++++++++++++++++++++++++++++++++++++
 include/linux/usb/tcpm.h |  8 +++++---
 2 files changed, 52 insertions(+), 3 deletions(-)

diff --git a/drivers/usb/typec/tcpm.c b/drivers/usb/typec/tcpm.c
index 7500dc0..0bd34c9 100644
--- a/drivers/usb/typec/tcpm.c
+++ b/drivers/usb/typec/tcpm.c
@@ -13,6 +13,7 @@
 #include <linux/module.h>
 #include <linux/mutex.h>
 #include <linux/proc_fs.h>
+#include <linux/property.h>
 #include <linux/sched/clock.h>
 #include <linux/seq_file.h>
 #include <linux/slab.h>
@@ -3595,6 +3596,52 @@ static int tcpm_copy_vdos(u32 *dest_vdo, const u32 *src_vdo,
 	return nr_vdo;
 }
 
+int tcpm_get_src_config(struct fwnode_handle *fwnode, struct tcpc_config *tcfg)
+{
+	int ret;
+
+	if (!fwnode)
+		return -EINVAL;
+
+	ret = fwnode_property_read_u32_array(fwnode, "source-pdos",
+					     NULL, 0);
+	if (ret <= 0)
+		return -EINVAL;
+
+	tcfg->nr_src_pdo = min(ret, PDO_MAX_OBJECTS);
+	return fwnode_property_read_u32_array(fwnode, "source-pdos",
+					      tcfg->src_pdo, tcfg->nr_src_pdo);
+}
+EXPORT_SYMBOL_GPL(tcpm_get_src_config);
+
+int tcpm_get_snk_config(struct fwnode_handle *fwnode, struct tcpc_config *tcfg)
+{
+	int ret;
+
+	if (!fwnode)
+		return -EINVAL;
+
+	if ((fwnode_property_read_u32(fwnode, "max-sink-microvolt",
+				      &tcfg->max_snk_mv) < 0) ||
+		(fwnode_property_read_u32(fwnode, "max-sink-microamp",
+					  &tcfg->max_snk_ma) < 0) ||
+		(fwnode_property_read_u32(fwnode, "max-sink-microwatt-hours",
+					  &tcfg->max_snk_mw) < 0) ||
+		(fwnode_property_read_u32(fwnode, "op-sink-microwatt-hours",
+					  &tcfg->operating_snk_mw) < 0))
+		return -EINVAL;
+
+	ret = fwnode_property_read_u32_array(fwnode, "sink-pdos",
+					     NULL, 0);
+	if (ret <= 0)
+		return -EINVAL;
+
+	tcfg->nr_snk_pdo = min(ret, PDO_MAX_OBJECTS);
+	return fwnode_property_read_u32_array(fwnode, "sink-pdos",
+					      tcfg->snk_pdo, tcfg->nr_snk_pdo);
+}
+EXPORT_SYMBOL_GPL(tcpm_get_snk_config);
+
 int tcpm_update_source_capabilities(struct tcpm_port *port, const u32 *pdo,
 				    unsigned int nr_pdo)
 {
diff --git a/include/linux/usb/tcpm.h b/include/linux/usb/tcpm.h
index e2e2db3..5d361f6 100644
--- a/include/linux/usb/tcpm.h
+++ b/include/linux/usb/tcpm.h
@@ -76,10 +76,10 @@ enum tcpm_transmit_type {
  * @alt_modes:	List of supported alternate modes
  */
 struct tcpc_config {
-	const u32 *src_pdo;
+	u32 *src_pdo;
 	unsigned int nr_src_pdo;
 
-	const u32 *snk_pdo;
+	u32 *snk_pdo;
 	unsigned int nr_snk_pdo;
 
 	const u32 *snk_vdo;
@@ -143,7 +143,7 @@ enum tcpc_mux_mode {
  * @mux:	Pointer to multiplexer data
  */
 struct tcpc_dev {
-	const struct tcpc_config *config;
+	struct tcpc_config *config;
 	struct fwnode_handle *fwnode;
 
 	int (*init)(struct tcpc_dev *dev);
@@ -189,5 +189,7 @@ void tcpm_pd_transmit_complete(struct tcpm_port *port,
 			       enum tcpm_transmit_status status);
 void tcpm_pd_hard_reset(struct tcpm_port *port);
 void tcpm_tcpc_reset(struct tcpm_port *port);
+int tcpm_get_src_config(struct fwnode_handle *fwnode, struct tcpc_config *tcfg);
+int tcpm_get_snk_config(struct fwnode_handle *fwnode, struct tcpc_config *tcfg);
 
 #endif /* __LINUX_USB_TCPM_H */
-- 
2.7.4

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