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authorAndrew Lunn2012-12-28 13:25:11 +0100
committerAnton Vorontsov2013-01-06 14:00:31 -0800
commitffd8f9a727f27270584c7472ca56cce1e4736888 (patch)
treee12dbb3f62ace5eb65251bc646f3da5a47a193ad /drivers/power
parente8fc721a9ab8dd6723063a92f5c5fdb5eaffbd6e (diff)
power/reset: Add a new driver implementing 'power off by restarting'
Some devices, Buffalo Linkstation LS-XHL and LS-CHLv2 for example, power-off by restarting to letting u-boot hold the SoC until the user presses a key. Add a generic driver to implement this. It binds a function to pm_power_off, which calls arm_pm_restart. Signed-off-by: Andrew Lunn <andrew@lunn.ch> Tested-by: Michael Walle <michael@walle.cc> Signed-off-by: Anton Vorontsov <anton@enomsg.org>
Diffstat (limited to 'drivers/power')
-rw-r--r--drivers/power/reset/Kconfig8
-rw-r--r--drivers/power/reset/Makefile1
-rw-r--r--drivers/power/reset/restart-poweroff.c65
3 files changed, 74 insertions, 0 deletions
diff --git a/drivers/power/reset/Kconfig b/drivers/power/reset/Kconfig
index 6453aac701c0..1ae65b822864 100644
--- a/drivers/power/reset/Kconfig
+++ b/drivers/power/reset/Kconfig
@@ -22,3 +22,11 @@ config POWER_RESET_QNAP
commands to the microcontroller which controls the main power.
Say Y if you have a QNAP NAS.
+
+config POWER_RESET_RESTART
+ bool "Restart power-off driver"
+ depends on ARM
+ help
+ Some boards don't actually have the ability to power off.
+ Instead they restart, and u-boot holds the SoC until the
+ user presses a key. u-boot then boots into Linux.
diff --git a/drivers/power/reset/Makefile b/drivers/power/reset/Makefile
index c4d3b2d11b9e..0f317f50c56f 100644
--- a/drivers/power/reset/Makefile
+++ b/drivers/power/reset/Makefile
@@ -1,2 +1,3 @@
obj-$(CONFIG_POWER_RESET_GPIO) += gpio-poweroff.o
obj-$(CONFIG_POWER_RESET_QNAP) += qnap-poweroff.o
+obj-$(CONFIG_POWER_RESET_RESTART) += restart-poweroff.o \ No newline at end of file
diff --git a/drivers/power/reset/restart-poweroff.c b/drivers/power/reset/restart-poweroff.c
new file mode 100644
index 000000000000..b11b9e887174
--- /dev/null
+++ b/drivers/power/reset/restart-poweroff.c
@@ -0,0 +1,65 @@
+/*
+ * Power off by restarting and let u-boot keep hold of the machine
+ * until the user presses a button for example.
+ *
+ * Andrew Lunn <andrew@lunn.ch>
+ *
+ * Copyright (C) 2012 Andrew Lunn
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ */
+#include <linux/kernel.h>
+#include <linux/init.h>
+#include <linux/platform_device.h>
+#include <linux/of_platform.h>
+#include <linux/module.h>
+#include <asm/system_misc.h>
+
+static void restart_poweroff_do_poweroff(void)
+{
+ arm_pm_restart('h', NULL);
+}
+
+static int __devinit restart_poweroff_probe(struct platform_device *pdev)
+{
+ /* If a pm_power_off function has already been added, leave it alone */
+ if (pm_power_off != NULL) {
+ dev_err(&pdev->dev,
+ "pm_power_off function already registered");
+ return -EBUSY;
+ }
+
+ pm_power_off = &restart_poweroff_do_poweroff;
+ return 0;
+}
+
+static int __devexit restart_poweroff_remove(struct platform_device *pdev)
+{
+ if (pm_power_off == &restart_poweroff_do_poweroff)
+ pm_power_off = NULL;
+
+ return 0;
+}
+
+static const struct of_device_id of_restart_poweroff_match[] = {
+ { .compatible = "restart-poweroff", },
+ {},
+};
+
+static struct platform_driver restart_poweroff_driver = {
+ .probe = restart_poweroff_probe,
+ .remove = __devexit_p(restart_poweroff_remove),
+ .driver = {
+ .name = "poweroff-restart",
+ .owner = THIS_MODULE,
+ .of_match_table = of_restart_poweroff_match,
+ },
+};
+module_platform_driver(restart_poweroff_driver);
+
+MODULE_AUTHOR("Andrew Lunn <andrew@lunn.ch");
+MODULE_DESCRIPTION("restart poweroff driver");
+MODULE_LICENSE("GPLv2");
+MODULE_ALIAS("platform:poweroff-restart");