TCPMv2: DPM sourcing policy - 3.0 A PD sinks

Move the sourcing policy from the charge_manager to the DPM for TCPMv2.
The first step of this policy will be to allocate 3.0 A only if a
peripheral reports requiring more than 1.5 A in their Sink Capabilities
vSafe5V operational current.  For this commit, leave in some
charge_manager APIs for linking which will be re-named or removed later.

BRANCH=None
BUG=b:141690755,b:168862110
TEST=on drawcia verify:
- non-PD sink only offered 1.5 A Rp
- PD sink requiring 1.5 A or less Rp isn't offered 3.0 A
- PD sink requiring 3.0 A is offered a new 3.0 A Source Capability after
sink capability probing.  Port continues to receive 3.0 A over both hard
and soft resets.
- When 2 3.0 A sinks are plugged in, only the first is offered 3.0 A.
After the first is unplugged, the second receives a 3.0 A source
capability message

Signed-off-by: Diana Z <dzigterman@chromium.org>
Change-Id: Iec48312df1125086db2919c1503c7ba31fe12bcc
Reviewed-on: https://chromium-review.googlesource.com/c/chromiumos/platform/ec/+/2597429
Reviewed-by: Keith Short <keithshort@chromium.org>

1 files changed, 17 insertions, 0 deletions

diff --git a/include/usb_pd_dpm.h b/include/usb_pd_dpm.h
index ccc7c57ff7..29253f4031 100644
--- a/include/usb_pd_dpm.h
+++ b/include/usb_pd_dpm.h
@@ -58,4 +58,21 @@ void dpm_vdm_naked(int port, enum tcpm_transmit_type type, uint16_t svid,
  */
 void dpm_run(int port);
 
+/*
+ * Determines the current allocation for the connection, past the basic
+ * CONFIG_USB_PD_PULLUP value set by the TC (generally 1.5 A)
+ *
+ * @param port		USB-C port number
+ * @param vsafe5v_pdo	Copy of first Sink_Capability PDO, which should
+ *			represent the vSafe5V fixed PDO
+ */
+void dpm_evaluate_sink_fixed_pdo(int port, uint32_t vsafe5v_pdo);
+
+/*
+ * Remove this port as a sink, and reallocate maximum current as needed.
+ *
+ * @param port		USB-C port number
+ */
+void dpm_remove_sink(int port);
+
 #endif  /* __CROS_EC_USB_DPM_H */