pd: add sending read info VDM every time source is plugged in

Every time a type-C source is plugged in, send a special VDM to
read device info. Device info will contain RW Hash (sha1), a
unique hardware descriptor (USB_PD_HARDWARE_DEVICE_ID), a
software version number just for debugging (USB_PD_DBG_SW_VERSION),
and a flag for if the device is in RW. This feature is off by
default and can be turned on by defining
CONFIG_USB_PD_READ_INFO_ON_CONNECT, currently defined for samus
and ryu only.

Renamed the read RW_HASH VDM to READ_INFO since it now returns
more than just the hash.

When device info is received, we store the RW hash. In the future
we will use this to check if device needs an update.

BUG=chrome-os-partner:31361
BRANCH=none
TEST=load onto a samus and a zinger. test when you attach zinger
we send a VDM, and we get device info printed to console. also
use "pd 0 hash" to query last hash received.

Change-Id: I0ca57651cf8506ea738b080a6cf8e7b020ef8724
Signed-off-by: Alec Berg <alecaberg@chromium.org>
Reviewed-on: https://chromium-review.googlesource.com/213832
Reviewed-by: Randall Spangler <rspangler@chromium.org>
Reviewed-by: Todd Broch <tbroch@chromium.org>

1 files changed, 24 insertions, 4 deletions

diff --git a/common/usb_pd_protocol.c b/common/usb_pd_protocol.c
index 263c9b63e0..387ea20e82 100644
--- a/common/usb_pd_protocol.c
+++ b/common/usb_pd_protocol.c
@@ -13,6 +13,7 @@
 #include "hooks.h"
 #include "host_command.h"
 #include "registers.h"
+#include "sha1.h"
 #include "task.h"
 #include "timer.h"
 #include "util.h"
@@ -220,6 +221,9 @@ static struct pd_protocol {
 	/* next Vendor Defined Message to send */
 	uint32_t vdo_data[VDO_MAX_SIZE];
 	uint8_t vdo_count;
+
+	/* Attached ChromeOS device RW hash */
+	uint32_t dev_rw_hash[SHA1_DIGEST_SIZE/4];
 } pd[PD_PORT_COUNT];
 
 /*
@@ -1019,6 +1023,11 @@ static void pd_vdm_send_state_machine(int port)
 	}
 }
 
+void pd_dev_store_rw_hash(int port, uint32_t *rw_hash)
+{
+	memcpy(pd[port].dev_rw_hash, rw_hash, SHA1_DIGEST_SIZE);
+}
+
 #ifdef CONFIG_USB_PD_DUAL_ROLE
 void pd_set_dual_role(enum pd_dual_role_states state)
 {
@@ -1276,6 +1285,11 @@ void pd_task(void)
 						!(cc1_volt >= PD_SNK_VA);
 					pd_select_polarity(port,
 							   pd[port].polarity);
+#ifdef CONFIG_USB_PD_READ_INFO_ON_CONNECT
+					/* Send google VDM to read info */
+					pd_send_vdm(port, USB_VID_GOOGLE,
+						VDO_CMD_READ_INFO, NULL, 0);
+#endif
 					set_state(port, PD_STATE_SNK_DISCOVERY);
 					timeout = 10*MSEC;
 				}
@@ -1493,9 +1507,9 @@ static int remote_flashing(int argc, char **argv)
 		cmd = VDO_CMD_FLASH_HASH;
 		cnt = argc;
 		ccprintf("HASH ...");
-	} else if (!strcasecmp(argv[3], "rw_hash")) {
-		cmd = VDO_CMD_RW_HASH;
-		ccprintf("RW HASH...");
+	} else if (!strcasecmp(argv[3], "info")) {
+		cmd = VDO_CMD_READ_INFO;
+		ccprintf("INFO...");
 	} else if (!strcasecmp(argv[3], "version")) {
 		cmd = VDO_CMD_VERSION;
 		ccprintf("VERSION...");
@@ -1602,6 +1616,11 @@ static int command_pd(int argc, char **argv)
 	} else if (!strncasecmp(argv[2], "hard", 4)) {
 		set_state(port, PD_STATE_HARD_RESET);
 		task_wake(PORT_TO_TASK_ID(port));
+	} else if (!strncasecmp(argv[2], "hash", 4)) {
+		int i;
+		for (i = 0; i < SHA1_DIGEST_SIZE / 4; i++)
+			ccprintf("%08x ", pd[port].dev_rw_hash[i]);
+		ccprintf("\n");
 	} else if (!strncasecmp(argv[2], "soft", 4)) {
 		execute_soft_reset(port);
 		send_control(port, PD_CTRL_SOFT_RESET);
@@ -1690,7 +1709,8 @@ static int command_pd(int argc, char **argv)
 DECLARE_CONSOLE_COMMAND(pd, command_pd,
 			"<port> "
 			"[tx|bist|charger|dev|dump|dualrole|enable"
-			"|soft|hard|clock|ping|state|vdm [ping | curr]]",
+			"|soft|hash|hard|clock|ping|state"
+			"|vdm [ping | curr]]",
 			"USB PD",
 			NULL);