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Index: sys/conf/files
===================================================================
--- sys/conf/files
+++ sys/conf/files
@@ -3172,6 +3172,7 @@
dev/sdio/sdiob.c optional mmccam
dev/sff/sff_if.m optional sff
dev/sff/sff.c optional sff
+dev/sff/sfp_acpi.c optional sff acpi
dev/sff/sfp_fdt.c optional sff fdt
dev/sge/if_sge.c optional sge pci
dev/siis/siis.c optional siis pci
Index: sys/dev/sff/sfp_acpi.c
===================================================================
--- /dev/null
+++ sys/dev/sff/sfp_acpi.c
@@ -0,0 +1,136 @@
+/*-
+ * SPDX-License-Identifier: BSD-2-Clause
+ *
+ * Copyright (c) 2026 Xiangbo Kong <yarshure@gmail.com>
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ * notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ * notice, this list of conditions and the following disclaimer in the
+ * documentation and/or other materials provided with the distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
+ * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
+ * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+ * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
+ * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+ * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+ * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
+ * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
+ * SUCH DAMAGE.
+ */
+
+/*
+ * Small Form Factor (SFF) Committee Pluggable (SFP) Transceiver (ACPI-based).
+ *
+ * The counterpart of sfp_fdt(4). Firmware describes the cage the same way a
+ * device tree does -- a node with compatible "sff,sfp" -- but places it where
+ * ACPI places an i2c device: in the scope of the bus its EEPROM answers on,
+ * with an I2cSerialBus resource giving the base page's 7-bit address, 0x50.
+ * So where the FDT front-end has to follow an "i2c-bus" phandle to find its
+ * bus, this one simply has it as a parent, and it can own the bus request
+ * itself rather than borrowing another device on the bus.
+ *
+ * Everything above this -- DPAA2_MC_GET_SFF_DEV(), SFF_READ_EEPROM() and the
+ * SIOCGI2C handler in the NIC driver -- is shared with the FDT path and knows
+ * nothing about which of the two described the transceiver.
+ */
+
+#include <sys/param.h>
+#include <sys/kernel.h>
+#include <sys/bus.h>
+#include <sys/module.h>
+#include <sys/systm.h>
+
+#include <contrib/dev/acpica/include/acpi.h>
+#include <dev/acpica/acpivar.h>
+
+#include <dev/iicbus/iicbus.h>
+#include <dev/iicbus/iiconf.h>
+
+#include "sff.h"
+#include "sff_if.h"
+
+#define SFP_ACPI_COMPAT "sff,sfp"
+
+static int
+sfp_acpi_probe(device_t dev)
+{
+ char compat[64];
+ ssize_t s;
+
+ if (acpi_disabled("sff"))
+ return (ENXIO);
+ if (acpi_get_handle(dev) == NULL)
+ return (ENXIO);
+
+ /*
+ * Match the same compatible string the device-tree binding uses; ACPI
+ * carries it in _DSD, with _HID "PRP0001".
+ */
+ memset(compat, 0, sizeof(compat));
+ s = device_get_property(dev, "compatible", compat, sizeof(compat) - 1,
+ DEVICE_PROP_ANY);
+ if (s <= 0 || strcmp(compat, SFP_ACPI_COMPAT) != 0)
+ return (ENXIO);
+
+ device_set_desc(dev, "Small Form-factor Pluggable Transceiver");
+ return (BUS_PROBE_DEFAULT);
+}
+
+static int
+sfp_acpi_attach(device_t dev)
+{
+
+ /*
+ * Nothing to latch. acpi_iicbus(4) already attached us to our
+ * namespace node, so acpi_get_device() on the handle a DPMAC's "sfp"
+ * property points at yields this device -- the ACPI equivalent of the
+ * xref registration sfp_fdt(4) has to do here.
+ */
+ return (0);
+}
+
+static int
+sfp_acpi_get_i2c_bus(device_t dev, device_t *i2c_bus)
+{
+
+ KASSERT(i2c_bus != NULL, ("%s: i2c_bus is NULL", __func__));
+
+ *i2c_bus = device_get_parent(dev);
+ return (0);
+}
+
+static int
+sfp_acpi_read_eeprom(device_t dev, uint8_t dev_addr, uint8_t offset,
+ uint8_t *buf, int len)
+{
+
+ /* We sit on the bus the EEPROM answers on, so we own the request. */
+ return (sff_read_eeprom(dev, dev_addr, offset, buf, len));
+}
+
+static device_method_t sfp_acpi_methods[] = {
+ /* Device interface */
+ DEVMETHOD(device_probe, sfp_acpi_probe),
+ DEVMETHOD(device_attach, sfp_acpi_attach),
+
+ /* SFF */
+ DEVMETHOD(sff_get_i2c_bus, sfp_acpi_get_i2c_bus),
+ DEVMETHOD(sff_read_eeprom, sfp_acpi_read_eeprom),
+
+ DEVMETHOD_END
+};
+
+DEFINE_CLASS_0(sfp_acpi, sfp_acpi_driver, sfp_acpi_methods, 0);
+
+DRIVER_MODULE(sfp_acpi, iicbus, sfp_acpi_driver, 0, 0);
+MODULE_VERSION(sfp_acpi, 1);
+MODULE_DEPEND(sfp_acpi, sff, 1, 1, 1);
+MODULE_DEPEND(sfp_acpi, acpi, 1, 1, 1);
+MODULE_DEPEND(sfp_acpi, iicbus, IICBUS_MINVER, IICBUS_PREFVER, IICBUS_MAXVER);
Index: sys/modules/sff/Makefile
===================================================================
--- sys/modules/sff/Makefile
+++ sys/modules/sff/Makefile
@@ -11,6 +11,13 @@
ofw_bus_if.h
.endif
+.if ${MACHINE_CPUARCH} == "aarch64" || ${MACHINE_CPUARCH} == "amd64" || \
+ ${MACHINE_CPUARCH} == "i386"
+SRCS+= sfp_acpi.c \
+ opt_acpi.h \
+ acpi_if.h
+.endif
+
#
# sff(4) 存在的意义就是被 NIC 驱动消费:它们需要 sff_read_eeprom() 和
# SFF_* kobj 方法描述符。没有这行,kmod 构建会把符号全部局部化,

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