usb: update state machine framework

- OBJ is renamed to context (CTX) for current and last state
 - State definition now includes its parent (no need for the boiler
plate function that takes in a signal)
 - The init_state, set_state, and exe_state have been re-written to take
advantages of new state machine definition. I had to add more logic to
handle hierarchical states fully.
 - Explicitly create the USB states at the bottom of the file with all
of the statics. Don't need to use macros (even though I did suggest them)
 - Use NULL when we do_nothing instead of calling into a function
 - Created a "private" enum in the C file that lists all of the states
in the file, that we can use to refer to a state (it is also the
index into the states array for that state).
 - Changed prototype of state function to return void, since we aren't
really using the return value and it cleans up a lot of return 0 that
aren't needed.
 - Add const to int port since we can and should
 - Moves struct definition to implementation file only to keep
implementation details private. We can access data through accessor if
needed.

BRANCH=none
BUG=none
TEST=all unit tests passes

Change-Id: I482a63e08f7d63022d5102b891a2fac0b0faa46f
Signed-off-by: Jett Rink <jettrink@chromium.org>
Reviewed-on: https://chromium-review.googlesource.com/c/chromiumos/platform/ec/+/1733744
Commit-Queue: Denis Brockus <dbrockus@chromium.org>
Reviewed-by: Denis Brockus <dbrockus@chromium.org>

1 files changed, 1 insertions, 107 deletions

diff --git a/include/usb_prl_sm.h b/include/usb_prl_sm.h
index 28f3a44078..4116bbe1a3 100644
--- a/include/usb_prl_sm.h
+++ b/include/usb_prl_sm.h
@@ -11,58 +11,6 @@
 #include "usb_pd.h"
 #include "usb_pd_tcpm.h"
 
-enum prl_tx_state_id {
-	PRL_TX_PHY_LAYER_RESET,
-	PRL_TX_WAIT_FOR_MESSAGE_REQUEST,
-	PRL_TX_LAYER_RESET_FOR_TRANSMIT,
-	PRL_TX_CONSTRUCT_MESSAGE,
-	PRL_TX_WAIT_FOR_PHY_RESPONSE,
-	PRL_TX_MATCH_MESSAGE_ID,
-	PRL_TX_MESSAGE_SENT,
-	PRL_TX_CHECK_RETRY_COUNTER,
-	PRL_TX_TRANSMISSION_ERROR,
-	PRL_TX_DISCARD_MESSAGE,
-
-	PRL_TX_SRC_SINK_TX,
-	PRL_TX_SRC_SOURCE_TX,
-	PRL_TX_SRC_PENDING,
-
-	PRL_TX_SNK_START_OF_AMS,
-	PRL_TX_SNK_PENDING,
-};
-
-enum prl_hr_state_id {
-	PRL_HR_WAIT_FOR_REQUEST,
-	PRL_HR_RESET_LAYER,
-	PRL_HR_INDICATE_HARD_RESET,
-	PRL_HR_WAIT_FOR_PHY_HARD_RESET_COMPLETE,
-	PRL_HR_PHY_HARD_RESET_REQUESTED,
-	PRL_HR_WAIT_FOR_PE_HARD_RESET_COMPLETE,
-	PRL_HR_PE_HARD_RESET_COMPLETE,
-};
-
-enum rch_state_id {
-	RCH_WAIT_FOR_MESSAGE_FROM_PROTOCOL_LAYER,
-	RCH_PASS_UP_MESSAGE,
-	RCH_PROCESSING_EXTENDED_MESSAGE,
-	RCH_REQUESTING_CHUNK,
-	RCH_WAITING_CHUNK,
-	RCH_REPORT_ERROR,
-};
-
-enum tch_state_id {
-	TCH_WAIT_FOR_MESSAGE_REQUEST_FROM_PE,
-	TCH_PASS_DOWN_MESSAGE,
-	TCH_WAIT_FOR_TRANSMISSION_COMPLETE,
-	TCH_MESSAGE_SENT,
-	TCH_PREPARE_TO_SEND_CHUNKED_MESSAGE,
-	TCH_CONSTRUCT_CHUNKED_MESSAGE,
-	TCH_SENDING_CHUNKED_MESSAGE,
-	TCH_WAIT_CHUNK_REQUEST,
-	TCH_MESSAGE_RECEIVED,
-	TCH_REPORT_ERROR,
-};
-
 /*
  * Number of times the Protocol Layer will try to transmit a message
  * before giving up and signaling an error
@@ -70,67 +18,13 @@ enum tch_state_id {
 #define N_RETRY_COUNT 2
 
 /**
- * Initialize the Protocol Layer State Machine
- *
- * @param port USB-C port number
- */
-void prl_init(int port);
-
-/**
- * Resets the Protocol Layer State Machine
- *
- * @param port USB-C port number
- */
-void prl_reset(int port);
-
-/**
- * Get Chunked Rx State Machine state id
- *
- * @param port USB-C port number
- * @return id
- */
-enum rch_state_id get_rch_state_id(int port);
-
-/**
- * Get Chunked Tx State Machine state id
- *
- * @param port USB-C port number
- * @return id
- */
-enum tch_state_id get_tch_state_id(int port);
-
-/**
- * Get Message Transmission State Machine state id
- *
- * @param port USB-C port number
- * @return id
- */
-enum prl_tx_state_id get_prl_tx_state_id(int port);
-
-/**
- * Get Hard Reset State Machine state id
- *
- * @param port USB-C port number
- * @return id
- */
-enum prl_hr_state_id get_prl_hr_state_id(int port);
-
-/**
- * Returns the state of the PRL state machine
- * @return SM_INIT for initializing
- *         SM_RUN for running
- *         SM_PAUSED for paused
- */
-enum sm_local_state prl_get_local_state(int port);
-
-/**
  * Runs the Protocol Layer State Machine
  *
  * @param port USB-C port number
  * @param evt  system event, ie: PD_EVENT_RX
  * @param en   0 to disable the machine, 1 to enable the machine
  */
-void usbc_protocol_layer(int port, int evt, int en);
+void prl_run(int port, int evt, int en);
 
 /**
  * Set the PD revision