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Subject[RFC PATCH v2 7/7] typec: tcpm: Add support for sink PPS related messages
This commit adds sink side support for Get_Status, Status,
Get_PPS_Status and PPS_Status handling. As there's the
potential for a partner to respond with Not_Supported
handling of this message is also added. Sending of
Not_Supported is added is added to handle messages
received but not yet handled.

Signed-off-by: Adam Thomson <Adam.Thomson.Opensource@diasemi.com>
---
drivers/usb/typec/tcpm.c | 152 ++++++++++++++++++++++++++++++++++++++++++++---
1 file changed, 143 insertions(+), 9 deletions(-)

diff --git a/drivers/usb/typec/tcpm.c b/drivers/usb/typec/tcpm.c
index 7c26c3d..8db49ab 100644
--- a/drivers/usb/typec/tcpm.c
+++ b/drivers/usb/typec/tcpm.c
@@ -19,7 +19,9 @@
#include <linux/slab.h>
#include <linux/spinlock.h>
#include <linux/usb/pd.h>
+#include <linux/usb/pd_ado.h>
#include <linux/usb/pd_bdo.h>
+#include <linux/usb/pd_ext_sdb.h>
#include <linux/usb/pd_vdo.h>
#include <linux/usb/tcpm.h>
#include <linux/usb/typec.h>
@@ -113,6 +115,11 @@
S(SNK_TRYWAIT_VBUS), \
S(BIST_RX), \
\
+ S(GET_STATUS_SEND), \
+ S(GET_STATUS_SEND_TIMEOUT), \
+ S(GET_PPS_STATUS_SEND), \
+ S(GET_PPS_STATUS_SEND_TIMEOUT), \
+ \
S(ERROR_RECOVERY), \
S(PORT_RESET), \
S(PORT_RESET_WAIT_OFF)
@@ -143,6 +150,7 @@ enum pd_msg_request {
PD_MSG_NONE = 0,
PD_MSG_CTRL_REJECT,
PD_MSG_CTRL_WAIT,
+ PD_MSG_CTRL_NOT_SUPP,
PD_MSG_DATA_SINK_CAP,
PD_MSG_DATA_SOURCE_CAP,
};
@@ -1285,10 +1293,42 @@ static void vdm_state_machine_work(struct work_struct *work)
/*
* PD (data, control) command handling functions
*/
+static inline enum tcpm_state ready_state(struct tcpm_port *port)
+{
+ if (port->pwr_role == TYPEC_SOURCE)
+ return SRC_READY;
+ else
+ return SNK_READY;
+}

static int tcpm_pd_send_control(struct tcpm_port *port,
enum pd_ctrl_msg_type type);

+static void tcpm_handle_alert(struct tcpm_port *port, const __le32 *payload,
+ int cnt)
+{
+ u32 p0 = le32_to_cpu(payload[0]);
+ unsigned int type = usb_pd_ado_type(p0);
+
+ if (!type) {
+ tcpm_log(port, "Alert message received with no type");
+ return;
+ }
+
+ /* Just handling non-battery alerts for now */
+ if (!(type & USB_PD_ADO_TYPE_BATT_STATUS_CHANGE)) {
+ switch (port->state) {
+ case SRC_READY:
+ case SNK_READY:
+ tcpm_set_state(port, GET_STATUS_SEND, 0);
+ break;
+ default:
+ tcpm_queue_message(port, PD_MSG_CTRL_WAIT);
+ break;
+ }
+ }
+}
+
static void tcpm_pd_data_request(struct tcpm_port *port,
const struct pd_message *msg)
{
@@ -1371,6 +1411,14 @@ static void tcpm_pd_data_request(struct tcpm_port *port,
tcpm_set_state(port, BIST_RX, 0);
}
break;
+ case PD_DATA_ALERT:
+ tcpm_handle_alert(port, msg->payload, cnt);
+ break;
+ case PD_DATA_BATT_STATUS:
+ case PD_DATA_GET_COUNTRY_INFO:
+ /* Currently unsupported */
+ tcpm_queue_message(port, PD_MSG_CTRL_NOT_SUPP);
+ break;
default:
tcpm_log(port, "Unhandled data message type %#x", type);
break;
@@ -1453,6 +1501,7 @@ static void tcpm_pd_ctrl_request(struct tcpm_port *port,
break;
case PD_CTRL_REJECT:
case PD_CTRL_WAIT:
+ case PD_CTRL_NOT_SUPP:
switch (port->state) {
case SNK_NEGOTIATE_CAPABILITIES:
/* USB PD specification, Figure 8-43 */
@@ -1569,12 +1618,84 @@ static void tcpm_pd_ctrl_request(struct tcpm_port *port,
break;
}
break;
+ case PD_CTRL_GET_SOURCE_CAP_EXT:
+ case PD_CTRL_GET_STATUS:
+ case PD_CTRL_FR_SWAP:
+ case PD_CTRL_GET_PPS_STATUS:
+ case PD_CTRL_GET_COUNTRY_CODES:
+ /* Currently not supported */
+ tcpm_queue_message(port, PD_MSG_CTRL_NOT_SUPP);
+ break;
default:
tcpm_log(port, "Unhandled ctrl message type %#x", type);
break;
}
}

+static void tcpm_pd_ext_msg_request(struct tcpm_port *port,
+ const struct pd_message *msg)
+{
+ enum pd_ext_msg_type type = pd_header_type_le(msg->header);
+ unsigned int data_size = pd_ext_header_data_size_le(msg->ext_msg.header);
+ u8 *data;
+
+ if (!(msg->ext_msg.header && PD_EXT_HDR_CHUNKED)) {
+ tcpm_log(port, "Unchunked extended messages unsupported");
+ return;
+ }
+
+ if (data_size > (PD_EXT_MAX_CHUNK_DATA)) {
+ tcpm_log(port, "Chunk handling not yet supported");
+ return;
+ }
+
+ data = kzalloc(data_size, GFP_KERNEL);
+ if (!data) {
+ tcpm_log(port, "Failed to allocate memory for ext msg data");
+ return;
+ }
+ memcpy(data, msg->ext_msg.data, data_size);
+
+ switch (type) {
+ case PD_EXT_STATUS:
+ /*
+ * If PPS related events raised then get PPS status to clear
+ * (see USB PD 3.0 Spec, 6.5.2.4)
+ */
+ if (data[USB_PD_EXT_SDB_EVENT_FLAGS] & USB_PD_EXT_SDB_PPS_EVENTS)
+ tcpm_set_state(port, GET_PPS_STATUS_SEND, 0);
+ else
+ tcpm_set_state(port, ready_state(port), 0);
+ break;
+ case PD_EXT_PPS_STATUS:
+ /*
+ * For now the PPS status message is used to clear events
+ * and nothing more.
+ */
+ tcpm_set_state(port, ready_state(port), 0);
+ break;
+ case PD_EXT_SOURCE_CAP_EXT:
+ case PD_EXT_GET_BATT_CAP:
+ case PD_EXT_GET_BATT_STATUS:
+ case PD_EXT_BATT_CAP:
+ case PD_EXT_GET_MANUFACTURER_INFO:
+ case PD_EXT_MANUFACTURER_INFO:
+ case PD_EXT_SECURITY_REQUEST:
+ case PD_EXT_SECURITY_RESPONSE:
+ case PD_EXT_FW_UPDATE_REQUEST:
+ case PD_EXT_FW_UPDATE_RESPONSE:
+ case PD_EXT_COUNTRY_INFO:
+ case PD_EXT_COUNTRY_CODES:
+ tcpm_queue_message(port, PD_MSG_CTRL_NOT_SUPP);
+ break;
+ default:
+ tcpm_log(port, "Unhandle extended message type %#x", type);
+ break;
+ }
+
+ kfree(data);
+}
+
static void tcpm_pd_rx_handler(struct work_struct *work)
{
struct pd_rx_event *event = container_of(work,
@@ -1615,7 +1736,9 @@ static void tcpm_pd_rx_handler(struct work_struct *work)
"Data role mismatch, initiating error recovery");
tcpm_set_state(port, ERROR_RECOVERY, 0);
} else {
- if (cnt)
+ if (msg->header & PD_HEADER_EXT_HDR)
+ tcpm_pd_ext_msg_request(port, msg);
+ else if (cnt)
tcpm_pd_data_request(port, msg);
else
tcpm_pd_ctrl_request(port, msg);
@@ -1676,6 +1799,9 @@ static bool tcpm_send_queued_message(struct tcpm_port *port)
case PD_MSG_CTRL_REJECT:
tcpm_pd_send_control(port, PD_CTRL_REJECT);
break;
+ case PD_MSG_CTRL_NOT_SUPP:
+ tcpm_pd_send_control(port, PD_CTRL_NOT_SUPP);
+ break;
case PD_MSG_DATA_SINK_CAP:
tcpm_pd_send_sink_caps(port);
break;
@@ -2348,14 +2474,6 @@ static inline enum tcpm_state hard_reset_state(struct tcpm_port *port)
return SNK_UNATTACHED;
}

-static inline enum tcpm_state ready_state(struct tcpm_port *port)
-{
- if (port->pwr_role == TYPEC_SOURCE)
- return SRC_READY;
- else
- return SNK_READY;
-}
-
static inline enum tcpm_state unattached_state(struct tcpm_port *port)
{
if (port->port_type == TYPEC_PORT_DRP) {
@@ -3058,6 +3176,22 @@ static void run_state_machine(struct tcpm_port *port)
/* Always switch to unattached state */
tcpm_set_state(port, unattached_state(port), 0);
break;
+ case GET_STATUS_SEND:
+ tcpm_pd_send_control(port, PD_CTRL_GET_STATUS);
+ tcpm_set_state(port, GET_STATUS_SEND_TIMEOUT,
+ PD_T_SENDER_RESPONSE);
+ break;
+ case GET_STATUS_SEND_TIMEOUT:
+ tcpm_set_state(port, ready_state(port), 0);
+ break;
+ case GET_PPS_STATUS_SEND:
+ tcpm_pd_send_control(port, PD_CTRL_GET_PPS_STATUS);
+ tcpm_set_state(port, GET_PPS_STATUS_SEND_TIMEOUT,
+ PD_T_SENDER_RESPONSE);
+ break;
+ case GET_PPS_STATUS_SEND_TIMEOUT:
+ tcpm_set_state(port, ready_state(port), 0);
+ break;
case ERROR_RECOVERY:
tcpm_swap_complete(port, -EPROTO);
tcpm_pps_complete(port, -EPROTO);
--
1.9.1
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