common: add feature bit for touchpad support

Add a new 'feature' bit to allow the host to auto-detect a TP MCU.

Signed-off-by: Wei-Ning Huang <wnhuang@google.com>

BRANCH=none
BUG=b:37584134
TEST=on eve with TP connected, look at the feature bit.

Change-Id: I81b30b96b31fc8dcb6769dd146fb33cdd487fddf
Reviewed-on: https://chromium-review.googlesource.com/485422
Commit-Ready: Wei-Ning Huang <wnhuang@chromium.org>
Tested-by: Wei-Ning Huang <wnhuang@chromium.org>
Reviewed-by: Gwendal Grignou <gwendal@chromium.org>

common/host_command.c

@@ -789,6 +789,9 @@ static int host_command_get_features(struct host_cmd_handler_args *args)
 #endif
 #ifdef CONFIG_SPI_FP_PORT
 		| EC_FEATURE_MASK_0(EC_FEATURE_FINGERPRINT)
+#endif
+#ifdef HAS_TASK_CENTROIDING
+		| EC_FEATURE_MASK_0(EC_FEATURE_TOUCHPAD)
 #endif
 		;
 	return EC_RES_SUCCESS;

include/ec_commands.h

@@ -1078,6 +1078,8 @@ enum ec_feature_code {
 	EC_FEATURE_RTC = 27,
 	/* The MCU exposes a Fingerprint sensor */
 	EC_FEATURE_FINGERPRINT = 28,
+	/* The MCU exposes a Touchpad */
+	EC_FEATURE_TOUCHPAD = 29,
 };
 
 #define EC_FEATURE_MASK_0(event_code) (1UL << (event_code % 32))

util/ectool.c

@@ -512,6 +512,7 @@ static const char * const ec_feature_names[] = {
 	[EC_FEATURE_VSTORE] = "Temporary secure vstore",
 	[EC_FEATURE_USBC_SS_MUX_VIRTUAL] = "Host-controlled USB-C SS mux",
 	[EC_FEATURE_RTC] = "Real-time clock",
+	[EC_FEATURE_TOUCHPAD] = "Touchpad",
 };
 
 int cmd_inventory(int argc, char *argv[])