zephyr test: Support EC_CMD_TYPEC_DISCOVERY

Add a utility function to wrap the Type-C Discovery host command.

BUG=b:219556831
TEST=zmake testall
BRANCH=none

Signed-off-by: Abe Levkoy <alevkoy@chromium.org>
Change-Id: I1737eadd58febfc7a4bd0a15098840ace510df08
Reviewed-on: https://chromium-review.googlesource.com/c/chromiumos/platform/ec/+/3502649
Reviewed-by: Jeremy Bettis <jbettis@chromium.org>
Commit-Queue: Jeremy Bettis <jbettis@chromium.org>

Author: Abe Levkoy

zephyr/test/drivers/include/utils.h

@@ -8,6 +8,7 @@
 
 #include <drivers/emul.h>
 #include <drivers/gpio/gpio_emul.h>
+#include <string.h>
 
 #include "charger.h"
 #include "emul/tcpc/emul_tcpci_partner_src.h"
@@ -208,6 +209,7 @@ host_cmd_get_charge_control(void)
 
 	zassume_ok(host_command_process(&args),
 		   "Failed to get charge control values");
+
 	return response;
 }
 
@@ -224,6 +226,19 @@ host_cmd_get_charge_control(void)
 void host_cmd_motion_sense_dump(int max_sensor_count,
 				struct ec_response_motion_sense *response);
 
+/**
+ * Run the host command to get the PD discovery responses.
+ *
+ * @param port          The USB-C port number
+ * @param partner_type  SOP, SOP', or SOP''
+ * @param response      Destination buffer for command response;
+ *                      should hold struct ec_response_typec_discovery and
+ *                      enough struct svid_mode_info for expected response.
+ * @param response_size Number of bytes in response
+ */
+void host_cmd_typec_discovery(int port, enum typec_partner_type partner_type,
+			      void *response, size_t response_size);
+
 #define GPIO_ACOK_OD_NODE DT_NODELABEL(gpio_acok_od)
 #define GPIO_ACOK_OD_PIN  DT_GPIO_PIN(GPIO_ACOK_OD_NODE, gpios)
 

zephyr/test/drivers/src/utils.c

@@ -111,3 +111,21 @@ void host_cmd_motion_sense_dump(int max_sensor_count,
 	zassume_ok(host_command_process(&args),
 		   "Failed to get motion_sense dump");
 }
+
+void host_cmd_typec_discovery(int port, enum typec_partner_type partner_type,
+			      void *response, size_t response_size)
+{
+	struct ec_params_typec_discovery params = {
+		.port = port, .partner_type = partner_type
+	};
+	struct host_cmd_handler_args args = BUILD_HOST_COMMAND_PARAMS(
+		EC_CMD_TYPEC_DISCOVERY, 0, params);
+	/* The expected response to EC_CMD_TYPEC_DISCOVERY extends beyond the
+	 * bounds of struct ec_response_typec_discovery.
+	 */
+	args.response = response;
+	args.response_max = response_size;
+
+	zassume_ok(host_command_process(&args),
+		   "Failed to get Type-C state for port %d", port);
+}