rwsig: expose a new feature bit when RWSIG task is enabled

Expose EC_FEATURE_RWSIG if RWSIG task is enabled. This allows flashrom
to run EC_CMD_RWSIG_ACTION and abort RWSIG jump, then perform regular
firmware update flow.

BRANCH=none
BUG=b:37584134
TEST=on eve, `ectool --name=cros_tp inventory` should show 'RWSIG task'.

Change-Id: Iea14f4f01fab201767dccd07d711ae9e1b638f6a
Signed-off-by: Wei-Ning Huang <wnhuang@google.com>
Reviewed-on: https://chromium-review.googlesource.com/497788
Commit-Ready: Wei-Ning Huang <wnhuang@chromium.org>
Tested-by: Wei-Ning Huang <wnhuang@chromium.org>
Reviewed-by: Nicolas Boichat <drinkcat@chromium.org>
Reviewed-by: Vincent Palatin <vpalatin@chromium.org>

common/host_command.c

@@ -792,6 +792,9 @@ static int host_command_get_features(struct host_cmd_handler_args *args)
 #endif
 #ifdef HAS_TASK_CENTROIDING
 		| EC_FEATURE_MASK_0(EC_FEATURE_TOUCHPAD)
+#endif
+#ifdef HAS_TASK_RWSIG
+		| EC_FEATURE_MASK_0(EC_FEATURE_RWSIG)
 #endif
 		;
 	return EC_RES_SUCCESS;

include/ec_commands.h

@@ -1080,6 +1080,8 @@ enum ec_feature_code {
 	EC_FEATURE_FINGERPRINT = 28,
 	/* The MCU exposes a Touchpad */
 	EC_FEATURE_TOUCHPAD = 29,
+	/* The MCU has RWSIG task enabled */
+	EC_FEATURE_RWSIG = 30,
 };
 
 #define EC_FEATURE_MASK_0(event_code) (1UL << (event_code % 32))

util/ectool.c

@@ -515,6 +515,7 @@ static const char * const ec_feature_names[] = {
 	[EC_FEATURE_USBC_SS_MUX_VIRTUAL] = "Host-controlled USB-C SS mux",
 	[EC_FEATURE_RTC] = "Real-time clock",
 	[EC_FEATURE_TOUCHPAD] = "Touchpad",
+	[EC_FEATURE_RWSIG] = "RWSIG task",
 };
 
 int cmd_inventory(int argc, char *argv[])