fusb302: Fairchild FUSB302B USB-C / USB-PD controller driver

sys/arm64/rockchip/rk3399_fusb302_helper.c

@@ -0,0 +1,132 @@
+/*-
+ * SPDX-License-Identifier: BSD-2-Clause
+ *
+ * Copyright (c) 2026 Kyle Crenshaw
+ * All rights reserved.
+ */
+
+#include <sys/param.h>
+#include <sys/bus.h>
+#include <sys/kernel.h>
+#include <sys/module.h>
+#include <sys/systm.h>
+#include <sys/sysctl.h>
+
+#include "rk3399_typec_altmode_var.h"
+
+static struct sysctl_ctx_list rk3399_fusb302_helper_ctx;
+static struct sysctl_oid *rk3399_fusb302_helper_tree;
+
+static int rk3399_fusb302_helper_valid;
+static int rk3399_fusb302_helper_dp_ready;
+static int rk3399_fusb302_helper_usb_ss = -1;
+static uint32_t rk3399_fusb302_helper_pin_assignment = 0x8;
+static uint32_t rk3399_fusb302_helper_dp_status = 0x9a;
+static uint32_t rk3399_fusb302_helper_get_count;
+
+int	fusb302_get_dp_altmode_state(device_t dev,
+	    struct rk3399_typec_dp_altmode_status *status);
+
+/*
+ * Export the same getter name that rk_cdn_dp already probes for.  This keeps
+ * the DP bridge out of the built-in FUSB302 driver while preserving the
+ * existing consumer path in rk_cdn_dp.
+ */
+int
+fusb302_get_dp_altmode_state(device_t dev __unused,
+    struct rk3399_typec_dp_altmode_status *status)
+{
+
+	if (status == NULL)
+		return (EINVAL);
+
+	status->valid = (rk3399_fusb302_helper_valid != 0);
+	status->dp_ready = (rk3399_fusb302_helper_dp_ready != 0);
+	status->usb_ss = rk3399_fusb302_helper_usb_ss;
+	status->pin_assignment = rk3399_fusb302_helper_pin_assignment;
+	status->dp_status = rk3399_fusb302_helper_dp_status;
+	rk3399_fusb302_helper_get_count++;
+	return (0);
+}
+
+static int
+rk3399_fusb302_helper_usb_ss_sysctl(SYSCTL_HANDLER_ARGS)
+{
+	int error, value;
+
+	value = rk3399_fusb302_helper_usb_ss;
+	error = sysctl_handle_int(oidp, &value, 0, req);
+	if (error != 0 || req->newptr == NULL)
+		return (error);
+	if (value < -1 || value > 1)
+		return (EINVAL);
+	rk3399_fusb302_helper_usb_ss = value;
+	return (0);
+}
+
+static int
+rk3399_fusb302_helper_modevent(module_t mod __unused, int what,
+    void *arg __unused)
+{
+	switch (what) {
+	case MOD_LOAD:
+		sysctl_ctx_init(&rk3399_fusb302_helper_ctx);
+		rk3399_fusb302_helper_tree = SYSCTL_ADD_NODE(
+		    &rk3399_fusb302_helper_ctx,
+		    SYSCTL_STATIC_CHILDREN(_hw),
+		    OID_AUTO, "rk3399_fusb302_helper",
+		    CTLFLAG_RW | CTLFLAG_MPSAFE, 0,
+		    "Post-boot FUSB302 DP Alt Mode bridge");
+		if (rk3399_fusb302_helper_tree == NULL)
+			return (ENOMEM);
+
+		SYSCTL_ADD_INT(&rk3399_fusb302_helper_ctx,
+		    SYSCTL_CHILDREN(rk3399_fusb302_helper_tree), OID_AUTO,
+		    "valid", CTLFLAG_RWTUN,
+		    &rk3399_fusb302_helper_valid, 0,
+		    "Whether helper-exported state should be considered present");
+		SYSCTL_ADD_INT(&rk3399_fusb302_helper_ctx,
+		    SYSCTL_CHILDREN(rk3399_fusb302_helper_tree), OID_AUTO,
+		    "dp_ready", CTLFLAG_RWTUN,
+		    &rk3399_fusb302_helper_dp_ready, 0,
+		    "Manual DP Alt Mode ready state");
+		SYSCTL_ADD_PROC(&rk3399_fusb302_helper_ctx,
+		    SYSCTL_CHILDREN(rk3399_fusb302_helper_tree), OID_AUTO,
+		    "usb_ss", CTLTYPE_INT | CTLFLAG_RWTUN | CTLFLAG_MPSAFE,
+		    NULL, 0, rk3399_fusb302_helper_usb_ss_sysctl, "I",
+		    "Manual USB_SS property: -1 unknown, 0 DP-only, 1 USB3+DP");
+		SYSCTL_ADD_U32(&rk3399_fusb302_helper_ctx,
+		    SYSCTL_CHILDREN(rk3399_fusb302_helper_tree), OID_AUTO,
+		    "pin_assignment", CTLFLAG_RWTUN,
+		    &rk3399_fusb302_helper_pin_assignment, 0,
+		    "Manual DP Alt Mode pin assignment value");
+		SYSCTL_ADD_U32(&rk3399_fusb302_helper_ctx,
+		    SYSCTL_CHILDREN(rk3399_fusb302_helper_tree), OID_AUTO,
+		    "dp_status", CTLFLAG_RWTUN,
+		    &rk3399_fusb302_helper_dp_status, 0,
+		    "Manual DP Alt Mode status value");
+		SYSCTL_ADD_U32(&rk3399_fusb302_helper_ctx,
+		    SYSCTL_CHILDREN(rk3399_fusb302_helper_tree), OID_AUTO,
+		    "get_count", CTLFLAG_RD,
+		    &rk3399_fusb302_helper_get_count, 0,
+		    "Number of exported state reads");
+		break;
+	case MOD_UNLOAD:
+		sysctl_ctx_free(&rk3399_fusb302_helper_ctx);
+		break;
+	default:
+		break;
+	}
+
+	return (0);
+}
+
+static moduledata_t rk3399_fusb302_helper_mod = {
+	"rk3399_fusb302_helper",
+	rk3399_fusb302_helper_modevent,
+	NULL
+};
+
+DECLARE_MODULE(rk3399_fusb302_helper, rk3399_fusb302_helper_mod,
+    SI_SUB_DRIVERS, SI_ORDER_MIDDLE);
+MODULE_VERSION(rk3399_fusb302_helper, 1);