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+#
+# Copyright (C) 2020 OpenWrt.org
+#
+# This is free software, licensed under the GNU General Public License v2.
+# See /LICENSE for more information.
+#
+
+include $(TOPDIR)/rules.mk
+include $(INCLUDE_DIR)/kernel.mk
+
+PKG_NAME:=linkstation-poweroff
+PKG_RELEASE:=1
+
+PKG_LICENSE:=GPL-2.0
+
+include $(INCLUDE_DIR)/package.mk
+
+define KernelPackage/linkstation-poweroff
+ SUBMENU:=Other modules
+ DEPENDS:=@TARGET_mvebu
+ KCONFIG:=
+ TITLE:=Buffalo LinkStation power off driver
+ FILES:=$(PKG_BUILD_DIR)/linkstation-poweroff.ko
+ AUTOLOAD:=$(call AutoLoad,31,linkstation-poweroff,1)
+endef
+
+define KernelPackage/linkstation-poweroff/description
+ Some Buffalo LinkStations use a LED output at the ethernet phy
+ to inform the board that a power off operation must be performed
+ after restarting. This driver sets the LED to the proper state
+ before restarting or powering off.
+endef
+
+EXTRA_KCONFIG:= \
+ CONFIG_POWER_RESET_LINKSTATION=m
+
+EXTRA_CFLAGS:= \
+ $(patsubst CONFIG_%, -DCONFIG_%=1, $(patsubst %=m,%,$(filter %=m,$(EXTRA_KCONFIG)))) \
+ $(patsubst CONFIG_%, -DCONFIG_%=1, $(patsubst %=y,%,$(filter %=y,$(EXTRA_KCONFIG))))
+
+MAKE_OPTS:= \
+ $(KERNEL_MAKE_FLAGS) \
+ M="$(PKG_BUILD_DIR)" \
+ EXTRA_CFLAGS="$(EXTRA_CFLAGS)" \
+ $(EXTRA_KCONFIG)
+
+define Build/Compile
+ $(MAKE) -C "$(LINUX_DIR)" \
+ $(MAKE_OPTS) \
+ modules
+endef
+
+$(eval $(call KernelPackage,linkstation-poweroff))
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+config POWER_RESET_LINKSTATION
+ tristate "Buffalo LinkStation power-off driver"
+ depends on ARCH_MVEBU || COMPILE_TEST
+ depends on OF_MDIO && PHYLIB
+ help
+ Some Buffalo LinkStations use a LED output at the ethernet PHY
+ to inform the board that a power off operation must be performed
+ after restarting. This driver sets the LED to the proper state
+ for restarting or powering off.
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+obj-${CONFIG_POWER_RESET_LINKSTATION} += linkstation-poweroff.o
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+// SPDX-License-Identifier: GPL-2.0
+/*
+ * LinkStation power off restart driver
+ * Copyright (C) 2020 Daniel González Cabanelas <dgcbueu@gmail.com>
+ *
+ */
+
+#include <linux/module.h>
+#include <linux/notifier.h>
+#include <linux/of.h>
+#include <linux/of_mdio.h>
+#include <linux/of_platform.h>
+#include <linux/reboot.h>
+#include <linux/phy.h>
+
+#define MII_MARVELL_LED_PAGE 3
+#define MII_PHY_LED_CTRL 16
+
+#define LED2_OFF (0x8 << 8)
+#define LED2_ON (0x9 << 8)
+#define LEDMASK GENMASK(11,8)
+
+static struct phy_device *phydev;
+
+static void mvphy_reg_led(u16 data)
+{
+ int rc;
+ rc = phy_modify_paged(phydev, MII_MARVELL_LED_PAGE,
+ MII_PHY_LED_CTRL, LEDMASK, data);
+ if (rc < 0)
+ dev_err(&phydev->mdio.dev,
+ "LED2 write register failed, %d\n", rc);
+}
+
+static int linkstation_reboot_notifier(struct notifier_block *nb,
+ unsigned long action, void *unused)
+{
+ if (action == SYS_RESTART)
+ mvphy_reg_led(LED2_ON);
+
+ return NOTIFY_DONE;
+}
+
+static struct notifier_block linkstation_reboot_nb = {
+ .notifier_call = linkstation_reboot_notifier,
+};
+
+static void linkstation_poweroff(void)
+{
+ unregister_reboot_notifier(&linkstation_reboot_nb);
+ mvphy_reg_led(LED2_OFF);
+
+ kernel_restart("Power off");
+}
+
+static int linkstation_poweroff_probe(struct platform_device *pdev)
+{
+ struct mii_bus *bus;
+ struct device_node *dn;
+
+ dn = of_parse_phandle(pdev->dev.of_node, "phy-handle,led", 0);
+
+ if (dn) {
+ phydev = of_phy_find_device(dn);
+ of_node_put(dn);
+ } else {
+ dn = of_find_node_by_name(NULL, "mdio");
+ if (!dn)
+ return -ENODEV;
+
+ bus = of_mdio_find_bus(dn);
+ if (!bus)
+ return -EPROBE_DEFER;
+
+ of_node_put(dn);
+
+ phydev = phy_find_first(bus);
+ }
+
+ if (!phydev)
+ return -ENODEV;
+
+ register_reboot_notifier(&linkstation_reboot_nb);
+ pm_power_off = linkstation_poweroff;
+
+ dev_info(&pdev->dev, "PHY [%s]\n", phydev_name(phydev));
+
+ return 0;
+}
+
+static int linkstation_poweroff_remove(struct platform_device *pdev)
+{
+ pm_power_off = NULL;
+ unregister_reboot_notifier(&linkstation_reboot_nb);
+
+ return 0;
+}
+
+static const struct of_device_id ls_poweroff_of_match[] = {
+ { .compatible = "linkstation,power-off", },
+ {},
+};
+
+MODULE_DEVICE_TABLE(of, ls_poweroff_of_match);
+
+static struct platform_driver linkstation_poweroff_driver = {
+ .probe = linkstation_poweroff_probe,
+ .remove = linkstation_poweroff_remove,
+ .driver = {
+ .name = "linkstation_power_off",
+ .of_match_table = ls_poweroff_of_match,
+ },
+};
+
+module_platform_driver(linkstation_poweroff_driver);
+
+MODULE_AUTHOR("Daniel González Cabanelas <dgcbueu@gmail.com>");
+MODULE_DESCRIPTION("LinkStation power off driver");
+MODULE_LICENSE("GPL v2");
Some Buffalo LinkStations perform the power off operation depending on the state of an output pin (LED) at the ethernet PHY. This package adds the driver for implementing this function. The driver is required by the Buffalo LinkStation LS421DE (mvebu target). Without it, the board reamains forever halted if a power off command is executed, unless the PSU is disconnected and connected again. Signed-off-by: Daniel González Cabanelas <dgcbueu@gmail.com> --- package/kernel/linkstation-pwr/Makefile | 53 ++++++++ package/kernel/linkstation-pwr/src/Kconfig | 9 ++ package/kernel/linkstation-pwr/src/Makefile | 1 + .../src/linkstation-poweroff.c | 119 ++++++++++++++++++ 4 files changed, 182 insertions(+) create mode 100644 package/kernel/linkstation-pwr/Makefile create mode 100644 package/kernel/linkstation-pwr/src/Kconfig create mode 100644 package/kernel/linkstation-pwr/src/Makefile create mode 100644 package/kernel/linkstation-pwr/src/linkstation-poweroff.c