/**
* Perform cleanup operations on an override port, when switching to a
* different port. This involves switching the port from sink to source,
* if applicable.
*/
static void charge_manager_cleanup_override_port(int port)
{
if (port < 0 || port >= CONFIG_USB_PD_PORT_COUNT)
return;
if (dualrole_capability[port] == CAP_DUALROLE &&
pd_get_role(port) == PD_ROLE_SINK)
pd_request_power_swap(port);
}
/**
* Attempt to switch to power source on port if applicable.
*/
static void charge_manager_switch_to_source(int port)
{
if (port < 0 || port >= CONFIG_USB_PD_PORT_COUNT)
return;
/* If connected to dual-role device, then ask for a swap */
if (dualrole_capability[port] == CAP_DUALROLE &&
pd_get_role(port) == PD_ROLE_SINK)
pd_request_power_swap(port);
}
/**
* Select an 'override port', a port which is always the preferred charge port.
* Returns EC_SUCCESS on success, ec_error_list status on failure.
*
* @param port Charge port to select as override, or
* OVERRIDE_OFF to select no override port,
* or OVERRIDE_DONT_CHARGE to specifc that no
* charge port should be selected.
*/
int charge_manager_set_override(int port)
{
int retval = EC_SUCCESS;
ASSERT(port >= OVERRIDE_DONT_CHARGE && port < CONFIG_USB_PD_PORT_COUNT);
CPRINTS("Charge Override: %d", port);
/* Supersede any pending delayed overrides. */
if (delayed_override_port != OVERRIDE_OFF) {
if (delayed_override_port != port)
charge_manager_cleanup_override_port(
delayed_override_port);
delayed_override_port = OVERRIDE_OFF;
hook_call_deferred(
charge_override_timeout, -1);
}
/* Set the override port if it's a sink. */
if (port < 0 || pd_get_role(port) == PD_ROLE_SINK) {
if (override_port != port) {
charge_manager_cleanup_override_port(override_port);
override_port = port;
if (charge_manager_is_seeded())
hook_call_deferred(charge_manager_refresh, 0);
}
}
/*
* If the attached device is capable of being a sink, request a
* power swap and set the delayed override for swap completion.
*/
else if (pd_get_role(port) != PD_ROLE_SINK &&
dualrole_capability[port] == CAP_DUALROLE) {
delayed_override_deadline.val = get_time().val +
POWER_SWAP_TIMEOUT;
delayed_override_port = port;
hook_call_deferred(
charge_override_timeout,
POWER_SWAP_TIMEOUT);
pd_request_power_swap(port);
/* Can't charge from requested port -- return error. */
} else
retval = EC_ERROR_INVAL;
return retval;
}
void pd_check_pr_role(int port, int pr_role, int flags)
{
/*
* If partner is dual-role power and dualrole toggling is on, consider
* if a power swap is necessary.
*/
if ((flags & PD_FLAGS_PARTNER_DR_POWER) &&
pd_get_dual_role() == PD_DRP_TOGGLE_ON) {
/*
* If we are source and partner is externally powered,
* swap to become a sink.
*/
if ((flags & PD_FLAGS_PARTNER_EXTPOWER) &&
pr_role == PD_ROLE_SOURCE)
pd_request_power_swap(port);
}
}
/**
* Select an 'override port', a port which is always the preferred charge port.
* Returns EC_SUCCESS on success, ec_error_list status on failure.
*
* @param port Charge port to select as override, or
* OVERRIDE_OFF to select no override port,
* or OVERRIDE_DONT_CHARGE to specifc that no
* charge port should be selected.
*/
int charge_manager_set_override(int port)
{
int retval = EC_SUCCESS;
ASSERT(port >= OVERRIDE_DONT_CHARGE && port < CONFIG_USB_PD_PORT_COUNT);
CPRINTS("Charge Override: %d", port);
/*
* If attempting to change the override port, then return
* error. Since we may be in the middle of a power swap on
* the original override port, it's too complicated to
* guarantee that the original override port is switched back
* to source.
*/
if (delayed_override_port != OVERRIDE_OFF)
return EC_ERROR_BUSY;
/* Set the override port if it's a sink. */
if (port < 0 || pd_get_role(port) == PD_ROLE_SINK) {
if (override_port != port) {
override_port = port;
if (charge_manager_is_seeded())
hook_call_deferred(charge_manager_refresh, 0);
}
}
/*
* If the attached device is capable of being a sink, request a
* power swap and set the delayed override for swap completion.
*/
else if (pd_get_role(port) != PD_ROLE_SINK &&
dualrole_capability[port] == CAP_DUALROLE) {
delayed_override_deadline.val = get_time().val +
POWER_SWAP_TIMEOUT;
delayed_override_port = port;
hook_call_deferred(
charge_override_timeout,
POWER_SWAP_TIMEOUT);
pd_request_power_swap(port);
/* Can't charge from requested port -- return error. */
} else
retval = EC_ERROR_INVAL;
return retval;
}
