1 files changed, 120 insertions, 0 deletions
diff --git a/board/cr50/user_pres.c b/board/cr50/user_pres.c
new file mode 100644
index 0000000000..218764657f
--- /dev/null
+++ b/board/cr50/user_pres.c
@@ -0,0 +1,120 @@
+/* Copyright 2022 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.
+ *
+ * Track USER_PRES_L
+ */
+#include "extension.h"
+#include "gpio.h"
+#include "hooks.h"
+#include "registers.h"
+#include "scratch_reg1.h"
+#include "timer.h"
+
+static uint64_t last_press;
+static uint8_t asserted;
+
+/* Save the timestamp when DIOM4 is deasserted. */
+void diom4_deasserted(enum gpio_signal unused)
+{
+	if (!board_use_diom4())
+		return;
+
+	asserted = 1;
+	last_press = get_time().val;
+}
+
+void disable_user_pres(void)
+{
+	asserted = 0;
+	gpio_set_wakepin(GPIO_DIOM4, 0);
+	/* Disable the pullup and input on DIOM4 */
+	GWRITE_FIELD(PINMUX, DIOM4_CTL, PU, 0);
+	GWRITE_FIELD(PINMUX, DIOM4_CTL, IE, 0);
+	gpio_disable_interrupt(GPIO_DIOM4);
+}
+
+void enable_user_pres(void)
+{
+	/*
+	 * The interrupt happens on the rising edge. Wake on the falling edge
+	 * to ensure cr50 sees the rising edge interrupt.
+	 */
+	gpio_set_wakepin(GPIO_DIOM4, GPIO_HIB_WAKE_FALLING);
+	/*
+	 * Some boards don't have an external pull up. Add an internal one to
+	 * make sure the signal isn't floating.
+	 * Enable the pullup and input on DIOM4
+	 */
+	GWRITE_FIELD(PINMUX, DIOM4_CTL, PU, 1);
+	GWRITE_FIELD(PINMUX, DIOM4_CTL, IE, 1);
+	/* Enable interrupts for user_pres_l detection */
+	gpio_enable_interrupt(GPIO_DIOM4);
+}
+
+/*
+ * Vendor command to for tracking USER_PRES_L
+ *
+ * This vendor command can be used to enable tracking USER_PRES_L on DIOM4 and
+ * get the time since DIOM4 was deasserted.
+ *
+ * checks:
+ * - batt_is_present - Factory reset can only be done if HW write protect is
+ *              removed.
+ * - FWMP disables ccd -  If FWMP has disabled ccd, then we can't bypass it with
+ *              a factory reset.
+ * - CCD password is set - If there is a password, someone will have to use that
+ *              to open ccd and enable ccd manually. A factory reset cannot be
+ *              used to get around the password.
+ */
+static enum vendor_cmd_rc vc_user_pres(enum vendor_cmd_cc code,
+				       void *buf,
+				       size_t input_size,
+				       size_t *response_size)
+{
+	struct user_pres_response response;
+	uint8_t *buffer = buf;
+
+	*response_size = 0;
+
+	if (input_size == 1) {
+		uint8_t *cmd = buffer;
+
+		if (*cmd == USER_PRES_DISABLE) {
+			board_write_prop(BOARD_USE_DIOM4, 0);
+			disable_user_pres();
+		} else if (*cmd == USER_PRES_ENABLE) {
+			board_write_prop(BOARD_USE_DIOM4, 1);
+			enable_user_pres();
+		} else {
+			return VENDOR_RC_BOGUS_ARGS;
+		}
+		return VENDOR_RC_SUCCESS;
+	} else if (input_size) {
+		return VENDOR_RC_BOGUS_ARGS;
+	}
+	*response_size = sizeof(response);
+	response.state = board_use_diom4() ? USER_PRES_ENABLE :
+			USER_PRES_DISABLE;
+	if (board_use_diom4() && asserted) {
+		response.state |= USER_PRES_PRESSED;
+		response.last_press = get_time().val - last_press;
+	}
+	memcpy(buffer, &response, sizeof(response));
+
+	return VENDOR_RC_SUCCESS;
+}
+DECLARE_VENDOR_COMMAND(VENDOR_CC_USER_PRES, vc_user_pres);
+
+/**
+ * Setup DIOM4 interrupts if the board uses them.
+ */
+static void init_user_pres(void)
+{
+	if (!board_use_diom4()) {
+		disable_user_pres();
+		return;
+	}
+	enable_user_pres();
+}
+DECLARE_HOOK(HOOK_INIT, init_user_pres, HOOK_PRIO_DEFAULT);