usb: typec: tcpm: add support for Sink Cap Extended msg response

Add support for responding to Sink Cap Extended msg request. To achieve
this, include parsing support for DT properties related to Sink Cap
Extended. The request for Sink Cap Ext is a control message while the
response is an extended message (chunked). As the Sink Caps Extended
Data Block size (24 Byte) is less than MaxExtendedMsgChunkLen (26 Byte),
a single chunk is sufficient to complete this AMS.

Supporting sink cap extended messages while responding to a
Get_Sink_Caps_Extended request when port is in Sink role is required in
order to be compliant with at least USB PD Rev3.1 Ver1.8.

Signed-off-by: Amit Sunil Dhamne <amitsd@google.com>
Reviewed-by: Badhri Jagan Sridharan <badhri@google.com>
Reviewed-by: Heikki Krogerus <heikki.krogerus@linux.intel.com>
Link: https://patch.msgid.link/20260223-skedb-v2-2-60675765bc7e@google.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

1 files changed, 80 insertions, 2 deletions

diff --git a/include/linux/usb/pd.h b/include/linux/usb/pd.h
index 6ccd1b2af993..5a98983195cb 100644
--- a/include/linux/usb/pd.h
+++ b/include/linux/usb/pd.h
@@ -34,7 +34,8 @@ enum pd_ctrl_msg_type {
 	PD_CTRL_FR_SWAP = 19,
 	PD_CTRL_GET_PPS_STATUS = 20,
 	PD_CTRL_GET_COUNTRY_CODES = 21,
-	/* 22-23 Reserved */
+	PD_CTRL_GET_SINK_CAP_EXT = 22,
+	/* 23 Reserved */
 	PD_CTRL_GET_REVISION = 24,
 	/* 25-31 Reserved */
 };
@@ -72,7 +73,8 @@ enum pd_ext_msg_type {
 	PD_EXT_PPS_STATUS = 12,
 	PD_EXT_COUNTRY_INFO = 13,
 	PD_EXT_COUNTRY_CODES = 14,
-	/* 15-31 Reserved */
+	PD_EXT_SINK_CAP_EXT = 15,
+	/* 16-31 Reserved */
 };
 
 #define PD_REV10	0x0
@@ -205,6 +207,72 @@ struct pd_message {
 	};
 } __packed;
 
+/*
+ * count_chunked_data_objs - Helper to calculate number of Data Objects on a 4
+ *   byte boundary.
+ * @size: Size of data block for extended message. Should *not* include extended
+ *   header size.
+ */
+static inline u8 count_chunked_data_objs(u32 size)
+{
+	size += offsetof(struct pd_chunked_ext_message_data, data);
+	return ((size / 4) + (size % 4 ? 1 : 0));
+}
+
+/* Sink Caps Extended Data Block Version */
+#define SKEDB_VER_1_0				1
+
+/* Sink Caps Extended Sink Modes */
+#define SINK_MODE_PPS		BIT(0)
+#define SINK_MODE_VBUS		BIT(1)
+#define SINK_MODE_AC_SUPPLY	BIT(2)
+#define SINK_MODE_BATT		BIT(3)
+#define SINK_MODE_BATT_UL	BIT(4) /* Unlimited battery power supply */
+#define SINK_MODE_AVS		BIT(5)
+
+/**
+ * struct sink_caps_ext_msg - Sink extended capability PD message
+ * @vid: Vendor ID
+ * @pid: Product ID
+ * @xid: Value assigned by USB-IF for product
+ * @fw: Firmware version
+ * @hw: Hardware version
+ * @skedb_ver: Sink Caps Extended Data Block (SKEDB) Version
+ * @load_step: Indicates the load step slew rate.
+ * @load_char: Sink overload characteristics
+ * @compliance: Types of sources the sink has been tested & certified on
+ * @touch_temp: Indicates the IEC standard to which the touch temperature
+ *              conforms to (if applicable).
+ * @batt_info: Indicates number batteries and hot swappable ports
+ * @modes: Charging caps & power sources supported
+ * @spr_min_pdp: Sink Minimum PDP for SPR mode
+ * @spr_op_pdp: Sink Operational PDP for SPR mode
+ * @spr_max_pdp: Sink Maximum PDP for SPR mode
+ * @epr_min_pdp: Sink Minimum PDP for EPR mode
+ * @epr_op_pdp: Sink Operational PDP for EPR mode
+ * @epr_max_pdp: Sink Maximum PDP for EPR mode
+ */
+struct sink_caps_ext_msg {
+	__le16 vid;
+	__le16 pid;
+	__le32 xid;
+	u8 fw;
+	u8 hw;
+	u8 skedb_ver;
+	u8 load_step;
+	__le16 load_char;
+	u8 compliance;
+	u8 touch_temp;
+	u8 batt_info;
+	u8 modes;
+	u8 spr_min_pdp;
+	u8 spr_op_pdp;
+	u8 spr_max_pdp;
+	u8 epr_min_pdp;
+	u8 epr_op_pdp;
+	u8 epr_max_pdp;
+} __packed;
+
 /* PDO: Power Data Object */
 #define PDO_MAX_OBJECTS		7
 
@@ -329,6 +397,11 @@ enum pd_apdo_type {
 #define PDO_SPR_AVS_APDO_9V_TO_15V_MAX_CURR	GENMASK(19, 10)	/* 10mA unit */
 #define PDO_SPR_AVS_APDO_15V_TO_20V_MAX_CURR	GENMASK(9, 0)	/* 10mA unit */
 
+/* SPR AVS has two different current ranges 9V - 15V, 15V - 20V */
+#define SPR_AVS_TIER1_MIN_VOLT_MV		9000
+#define SPR_AVS_TIER1_MAX_VOLT_MV		15000
+#define SPR_AVS_TIER2_MAX_VOLT_MV		20000
+
 static inline enum pd_pdo_type pdo_type(u32 pdo)
 {
 	return (pdo >> PDO_TYPE_SHIFT) & PDO_TYPE_MASK;
@@ -339,6 +412,11 @@ static inline unsigned int pdo_fixed_voltage(u32 pdo)
 	return ((pdo >> PDO_FIXED_VOLT_SHIFT) & PDO_VOLT_MASK) * 50;
 }
 
+static inline unsigned int pdo_fixed_current(u32 pdo)
+{
+	return ((pdo >> PDO_FIXED_CURR_SHIFT) & PDO_CURR_MASK) * 10;
+}
+
 static inline unsigned int pdo_min_voltage(u32 pdo)
 {
 	return ((pdo >> PDO_VAR_MIN_VOLT_SHIFT) & PDO_VOLT_MASK) * 50;