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/* Copyright 2019 The ChromiumOS Authors
* Use of this source code is governed by a BSD-style license that can be
* found in the LICENSE file.
*/
#include "common.h"
#include "console.h"
#include "task.h"
#include "util.h"
#include "usb_pd.h"
#include "usb_pd_tcpm.h"
#include "usb_pe_sm.h"
#include "usb_prl_sm.h"
#include "usb_pd_tcpm.h"
#include "usb_tc_sm.h"
#include "usb_emsg.h"
#include "usb_sm.h"
/* USB Policy Engine Charge-Through VCONN Powered Device module */
/* Policy Engine Flags */
#define PE_FLAGS_MSG_RECEIVED BIT(0)
/**
* This is the PE Port object that contains information needed to
* implement a VCONN and Charge-Through VCONN Powered Device.
*/
static struct policy_engine {
/* state machine context */
struct sm_ctx ctx;
/* port flags, see PE_FLAGS_* */
uint32_t flags;
} pe[CONFIG_USB_PD_PORT_MAX_COUNT];
/* List of all policy-engine-level states */
enum usb_pe_state {
PE_REQUEST,
};
/* Forward declare the full list of states. This is indexed by usb_pe_states */
static const struct usb_state pe_states[];
static void set_state_pe(const int port, enum usb_pe_state new_state)
{
set_state(port, &pe[port].ctx, &pe_states[new_state]);
}
static void pe_init(int port)
{
const struct sm_ctx cleared = {};
pe[port].flags = 0;
pe[port].ctx = cleared;
set_state_pe(port, PE_REQUEST);
}
bool pe_in_frs_mode(int port)
{
/* Will never be in FRS mode */
return false;
}
bool pe_in_local_ams(int port)
{
/* We never start a local AMS */
return false;
}
void pe_run(int port, int evt, int en)
{
static enum sm_local_state local_state[CONFIG_USB_PD_PORT_MAX_COUNT];
switch (local_state[port]) {
case SM_PAUSED:
if (!en)
break;
__fallthrough;
case SM_INIT:
pe_init(port);
local_state[port] = SM_RUN;
__fallthrough;
case SM_RUN:
if (en)
run_state(port, &pe[port].ctx);
else
local_state[port] = SM_PAUSED;
break;
}
}
void pe_message_received(int port)
{
pe[port].flags |= PE_FLAGS_MSG_RECEIVED;
task_wake(PD_PORT_TO_TASK_ID(port));
}
/**
* NOTE:
* The Charge-Through Vconn Powered Device's Policy Engine is very
* simple and no implementation is needed for the following functions
* that might be called by the Protocol Layer.
*/
void pe_hard_reset_sent(int port)
{
/* No implementation needed by this policy engine */
}
void pe_got_hard_reset(int port)
{
/* No implementation needed by this policy engine */
}
void pe_report_error(int port, enum pe_error e, enum tcpci_msg_type type)
{
/* No implementation needed by this policy engine */
}
void pe_report_discard(int port)
{
/* No implementation needed by this policy engine */
}
void pe_got_soft_reset(int port)
{
/* No implementation needed by this policy engine */
}
void pe_message_sent(int port)
{
/* No implementation needed by this policy engine */
}
static void pe_request_run(const int port)
{
uint32_t *payload = (uint32_t *)tx_emsg[port].buf;
uint32_t header = rx_emsg[port].header;
uint32_t vdo = *(uint32_t *)rx_emsg[port].buf;
if (pe[port].flags & PE_FLAGS_MSG_RECEIVED) {
pe[port].flags &= ~PE_FLAGS_MSG_RECEIVED;
/*
* Only support Structured VDM Discovery
* Identity message
*/
if (PD_HEADER_TYPE(header) != PD_DATA_VENDOR_DEF)
return;
if (PD_HEADER_CNT(header) == 0)
return;
if (!PD_VDO_SVDM(vdo))
return;
if (PD_VDO_CMD(vdo) != CMD_DISCOVER_IDENT)
return;
#ifdef CONFIG_USB_CTVPD
/*
* We have a valid DISCOVER IDENTITY message.
* Attempt to reset support timer
*/
tc_reset_support_timer(port);
#endif
/* Prepare to send ACK */
/* VDM Header */
payload[0] = VDO(USB_VID_GOOGLE, 1, /* Structured VDM */
VDO_SVDM_VERS(1) | VDO_CMDT(CMDT_RSP_ACK) |
CMD_DISCOVER_IDENT);
/* ID Header VDO */
payload[1] = VDO_IDH(0, /* Not a USB Host */
1, /* Capable of being enumerated as USB
Device */
IDH_PTYPE_VPD, 0, /* Modal Operation Not
Supported */
USB_VID_GOOGLE);
/* Cert State VDO */
payload[2] = 0;
/* Product VDO */
payload[3] = VDO_PRODUCT(CONFIG_USB_PID, USB_BCD_DEVICE);
/* VPD VDO */
payload[4] = VDO_VPD(
VPD_HW_VERSION, VPD_FW_VERSION, VPD_MAX_VBUS_20V,
IS_ENABLED(CONFIG_USB_CTVPD) ? VPD_CT_CURRENT : 0,
IS_ENABLED(CONFIG_USB_CTVPD) ?
VPD_VBUS_IMP(VPD_VBUS_IMPEDANCE) :
0,
IS_ENABLED(CONFIG_USB_CTVPD) ?
VPD_GND_IMP(VPD_GND_IMPEDANCE) :
0,
IS_ENABLED(CONFIG_USB_CTVPD) ? VPD_CTS_SUPPORTED :
VPD_CTS_NOT_SUPPORTED);
/* 20 bytes, 5 data objects */
tx_emsg[port].len = 20;
/* Set to highest revision supported by both ports. */
prl_set_rev(port, TCPCI_MSG_SOP_PRIME,
(PD_HEADER_REV(header) > PD_REV30) ?
PD_REV30 :
PD_HEADER_REV(header));
/* Send the ACK */
prl_send_data_msg(port, TCPCI_MSG_SOP_PRIME,
PD_DATA_VENDOR_DEF);
}
}
/* All policy-engine-level states. */
static const struct usb_state pe_states[] = {
[PE_REQUEST] = {
.run = pe_request_run,
},
};
#ifdef TEST_BUILD
const struct test_sm_data test_pe_sm_data[] = {
{
.base = pe_states,
.size = ARRAY_SIZE(pe_states),
},
};
const int test_pe_sm_data_size = ARRAY_SIZE(test_pe_sm_data);
#endif
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