Add back unit test for usb_pd"

This is mostly the same as previous commits, but with increased delay.
Previously, we have short delays (e.g. 3ms) which is too short and may
cause instability.

Now that we have slowed down the time when running unit tests and
increased the delay, this shouldn't cause problems anymore.

BUG=chrome-os-partner:31200
TEST=Repeatedly run multiple unit tests in parallel.
BRANCH=Samus

Change-Id: Ib55e3adc5fd27a8e233996b4799dab3cefd62318
Signed-off-by: Vic Yang <victoryang@chromium.org>
Reviewed-on: https://chromium-review.googlesource.com/220734
Reviewed-by: Vincent Palatin <vpalatin@chromium.org>

1 files changed, 122 insertions, 0 deletions

diff --git a/board/host/usb_pd_policy.c b/board/host/usb_pd_policy.c
new file mode 100644
index 0000000000..ffa6d53be9
--- /dev/null
+++ b/board/host/usb_pd_policy.c
@@ -0,0 +1,122 @@
+/* Copyright (c) 2014 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.
+ */
+
+#include "common.h"
+#include "console.h"
+#include "usb_pd.h"
+#include "util.h"
+
+const uint32_t pd_src_pdo[] = {
+		PDO_FIXED(5000,   500, PDO_FIXED_EXTERNAL),
+		PDO_FIXED(5000,   900, 0),
+};
+const int pd_src_pdo_cnt = ARRAY_SIZE(pd_src_pdo);
+
+const uint32_t pd_snk_pdo[] = {
+		PDO_BATT(4500,   5500, 15000),
+		PDO_BATT(11500, 12500, 36000),
+};
+const int pd_snk_pdo_cnt = ARRAY_SIZE(pd_snk_pdo);
+
+/* Cap on the max voltage requested as a sink (in millivolts) */
+static unsigned max_mv = -1; /* no cap */
+
+int pd_choose_voltage(int cnt, uint32_t *src_caps, uint32_t *rdo)
+{
+	int i;
+	int sel_mv;
+	int max_uw = 0;
+	int max_i = -1;
+
+	/* Get max power */
+	for (i = 0; i < cnt; i++) {
+		int uw;
+		int mv = ((src_caps[i] >> 10) & 0x3FF) * 50;
+		if ((src_caps[i] & PDO_TYPE_MASK) == PDO_TYPE_BATTERY) {
+			uw = 250000 * (src_caps[i] & 0x3FF);
+		} else {
+			int ma = (src_caps[i] & 0x3FF) * 10;
+			uw = ma * mv;
+		}
+		if ((uw > max_uw) && (mv <= max_mv)) {
+			max_i = i;
+			max_uw = uw;
+			sel_mv = mv;
+		}
+	}
+	if (max_i < 0)
+		return -EC_ERROR_UNKNOWN;
+
+	/* request all the power ... */
+	if ((src_caps[max_i] & PDO_TYPE_MASK) == PDO_TYPE_BATTERY) {
+		int uw = 250000 * (src_caps[max_i] & 0x3FF);
+		*rdo = RDO_BATT(max_i + 1, uw/2, uw, 0);
+		ccprintf("Request [%d] %dV %d/%d mW\n",
+			 max_i, sel_mv/1000, uw/1000, uw/1000);
+	} else {
+		int ma = 10 * (src_caps[max_i] & 0x3FF);
+		*rdo = RDO_FIXED(max_i + 1, ma / 2, ma, 0);
+		ccprintf("Request [%d] %dV %d/%d mA\n",
+			 max_i, sel_mv/1000, max_i, ma/2, ma);
+	}
+	return EC_SUCCESS;
+}
+
+void pd_set_max_voltage(unsigned mv)
+{
+	max_mv = mv;
+}
+
+int pd_request_voltage(uint32_t rdo)
+{
+	int op_ma = rdo & 0x3FF;
+	int max_ma = (rdo >> 10) & 0x3FF;
+	int idx = rdo >> 28;
+	uint32_t pdo;
+	uint32_t pdo_ma;
+
+	if (!idx || idx > pd_src_pdo_cnt)
+		return EC_ERROR_INVAL; /* Invalid index */
+
+	/* check current ... */
+	pdo = pd_src_pdo[idx - 1];
+	pdo_ma = (pdo & 0x3ff);
+	if (op_ma > pdo_ma)
+		return EC_ERROR_INVAL; /* too much op current */
+	if (max_ma > pdo_ma)
+		return EC_ERROR_INVAL; /* too much max current */
+
+	ccprintf("Switch to %d V %d mA (for %d/%d mA)\n",
+		 ((pdo >> 10) & 0x3ff) * 50, (pdo & 0x3ff) * 10,
+		 ((rdo >> 10) & 0x3ff) * 10, (rdo & 0x3ff) * 10);
+
+	return EC_SUCCESS;
+}
+
+int pd_set_power_supply_ready(int port)
+{
+	/* Not implemented */
+	return EC_SUCCESS;
+}
+
+void pd_power_supply_reset(int port)
+{
+	/* Not implemented */
+}
+
+void pd_set_input_current_limit(uint32_t max_ma)
+{
+	/* Not implemented */
+}
+
+int pd_board_checks(void)
+{
+	return EC_SUCCESS;
+}
+
+int pd_custom_vdm(int port, int cnt, uint32_t *payload, uint32_t **rpayload)
+{
+	return 0;
+}