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/* Copyright 2020 The Chromium OS Authors. All rights reserved.
* Use of this source code is governed by a BSD-style license that can be
* found in the LICENSE file.
*/
/*
* Device Policy Manager implementation
* Refer to USB PD 3.0 spec, version 2.0, sections 8.2 and 8.3
*/
#include "compile_time_macros.h"
#include "console.h"
#include "usb_dp_alt_mode.h"
#include "usb_pd.h"
#include "usb_pd_dpm.h"
#include "usb_pe_sm.h"
#include "tcpm.h"
#ifdef CONFIG_COMMON_RUNTIME
#define CPRINTF(format, args...) cprintf(CC_USBPD, format, ## args)
#define CPRINTS(format, args...) cprints(CC_USBPD, format, ## args)
#else
#define CPRINTF(format, args...)
#define CPRINTS(format, args...)
#endif
static struct {
bool mode_entry_done;
} dpm[CONFIG_USB_PD_PORT_MAX_COUNT];
void dpm_init(int port)
{
dpm[port].mode_entry_done = false;
}
void dpm_set_mode_entry_done(int port)
{
dpm[port].mode_entry_done = true;
}
void dpm_vdm_acked(int port, enum tcpm_transmit_type type, int vdo_count,
uint32_t *vdm)
{
const uint16_t svid = PD_VDO_VID(vdm[0]);
assert(vdo_count >= 1);
switch (svid) {
case USB_SID_DISPLAYPORT:
dp_vdm_acked(port, type, vdo_count, vdm);
break;
default:
CPRINTS("C%d: Received unexpected VDM ACK for SVID %d", port,
svid);
}
}
void dpm_vdm_naked(int port, enum tcpm_transmit_type type, uint16_t svid,
uint8_t vdm_cmd)
{
switch (svid) {
case USB_SID_DISPLAYPORT:
dp_vdm_naked(port, type, vdm_cmd);
break;
default:
CPRINTS("C%d: Received unexpected VDM NAK for SVID %d", port,
svid);
}
}
void dpm_attempt_mode_entry(int port)
{
uint32_t vdo_count;
uint32_t vdm[VDO_MAX_SIZE];
if (dpm[port].mode_entry_done)
return;
if (pd_get_data_role(port) != PD_ROLE_DFP)
return;
/*
* Check if we even discovered a DisplayPort mode; if not, just
* mark discovery done and get out of here.
*/
if (!pd_is_mode_discovered_for_svid(port, TCPC_TX_SOP,
USB_SID_DISPLAYPORT)) {
CPRINTF("C%d: No DP mode discovered\n", port);
dpm_set_mode_entry_done(port);
return;
}
vdo_count = dp_setup_next_vdm(port, ARRAY_SIZE(vdm), vdm);
if (vdo_count < 0) {
dpm_set_mode_entry_done(port);
CPRINTF("C%d: Couldn't set up DP VDM\n", port);
return;
}
/*
* TODO(b/155890173): Provide a host command to request that the PE send
* an arbitrary VDM via this mechanism.
*/
if (!pd_setup_vdm_request(port, TCPC_TX_SOP, vdm, vdo_count)) {
dpm_set_mode_entry_done(port);
return;
}
pe_dpm_request(port, DPM_REQUEST_VDM);
}
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