[PATCH v3 1/3] power: reset: new driver regulator-poweroff

[Michael Klein <michael@xxxxxxxxxxxx>]

This driver registers a pm_power_off function to disable a set of
regulators defined in the devicetree to turn off the board.

Signed-off-by: Michael Klein <michael@xxxxxxxxxxxx>
---
 drivers/power/reset/Kconfig              |   7 ++
 drivers/power/reset/Makefile             |   1 +
 drivers/power/reset/regulator-poweroff.c | 107 +++++++++++++++++++++++
 3 files changed, 115 insertions(+)
 create mode 100644 drivers/power/reset/regulator-poweroff.c

diff --git a/drivers/power/reset/Kconfig b/drivers/power/reset/Kconfig
index d55b3727e00e..ae6cb7b0bd4d 100644
--- a/drivers/power/reset/Kconfig
+++ b/drivers/power/reset/Kconfig
@@ -177,6 +177,13 @@ config POWER_RESET_QNAP
 
 	  Say Y if you have a QNAP NAS.
 
+config POWER_RESET_REGULATOR
+	bool "Regulator subsystem power-off driver"
+	depends on OF && REGULATOR
+	help
+	  This driver supports turning off your board by disabling a set
+	  of regulators defined in the devicetree.
+
 config POWER_RESET_RESTART
 	bool "Restart power-off driver"
 	help
diff --git a/drivers/power/reset/Makefile b/drivers/power/reset/Makefile
index c51eceba9ea3..9dc49d3a57ff 100644
--- a/drivers/power/reset/Makefile
+++ b/drivers/power/reset/Makefile
@@ -19,6 +19,7 @@ obj-$(CONFIG_POWER_RESET_OCELOT_RESET) += ocelot-reset.o
 obj-$(CONFIG_POWER_RESET_PIIX4_POWEROFF) += piix4-poweroff.o
 obj-$(CONFIG_POWER_RESET_LTC2952) += ltc2952-poweroff.o
 obj-$(CONFIG_POWER_RESET_QNAP) += qnap-poweroff.o
+obj-$(CONFIG_POWER_RESET_REGULATOR) += regulator-poweroff.o
 obj-$(CONFIG_POWER_RESET_RESTART) += restart-poweroff.o
 obj-$(CONFIG_POWER_RESET_ST) += st-poweroff.o
 obj-$(CONFIG_POWER_RESET_VERSATILE) += arm-versatile-reboot.o
diff --git a/drivers/power/reset/regulator-poweroff.c b/drivers/power/reset/regulator-poweroff.c
new file mode 100644
index 000000000000..df2ca4fdcc49
--- /dev/null
+++ b/drivers/power/reset/regulator-poweroff.c
@@ -0,0 +1,107 @@
+// SPDX-License-Identifier: GPL-2.0-only
+/*
+ * Force-disables a regulator to power down a device
+ *
+ * Michael Klein <michael@xxxxxxxxxxxx>
+ *
+ * Copyright (C) 2020 Michael Klein
+ *
+ * Based on the gpio-poweroff driver.
+ */
+#include <linux/delay.h>
+#include <linux/init.h>
+#include <linux/kernel.h>
+#include <linux/module.h>
+#include <linux/of.h>
+#include <linux/platform_device.h>
+#include <linux/regulator/consumer.h>
+
+#define DEFAULT_TIMEOUT_MS 3000
+
+/*
+ * Hold configuration here, cannot be more than one instance of the driver
+ * since pm_power_off itself is global.
+ */
+static struct regulator **poweroff_regulators;
+static u32 timeout = DEFAULT_TIMEOUT_MS;
+
+static void regulator_poweroff_do_poweroff(void)
+{
+	struct regulator **it;
+
+	if (poweroff_regulators)
+		for (it = poweroff_regulators; *it; ++it)
+			if (regulator_is_enabled(*it))
+				regulator_force_disable(*it);
+
+	/* give it some time */
+	mdelay(timeout);
+
+	WARN_ON(1);
+}
+
+static int regulator_poweroff_probe(struct platform_device *pdev)
+{
+	int count;
+	const char *name;
+	struct regulator **it;
+	struct property *prop;
+	struct device_node *node = pdev->dev.of_node;
+
+	/* If a pm_power_off function has already been added, leave it alone */
+	if (pm_power_off != NULL) {
+		dev_err(&pdev->dev,
+			"%s: pm_power_off function already registered\n",
+		       __func__);
+		return -EBUSY;
+	}
+
+	count = of_property_count_strings(node, "regulator-names");
+	if (count <= 0)
+		return -ENOENT;
+
+	poweroff_regulators = devm_kcalloc(&pdev->dev, count + 1,
+		sizeof(struct regulator *), GFP_KERNEL);
+
+	it = poweroff_regulators;
+	of_property_for_each_string(node, "regulator-names", prop, name) {
+		*it = devm_regulator_get(&pdev->dev, name);
+		if (IS_ERR(*it))
+			return PTR_ERR(*it);
+		it++;
+	}
+
+	of_property_read_u32(node, "timeout-ms", &timeout);
+
+	pm_power_off = &regulator_poweroff_do_poweroff;
+	return 0;
+}
+
+static int regulator_poweroff_remove(__maybe_unused struct platform_device *pdev)
+{
+	if (pm_power_off == &regulator_poweroff_do_poweroff)
+		pm_power_off = NULL;
+
+	return 0;
+}
+
+static const struct of_device_id of_regulator_poweroff_match[] = {
+	{ .compatible = "regulator-poweroff", },
+	{},
+};
+
+static struct platform_driver regulator_poweroff_driver = {
+	.probe = regulator_poweroff_probe,
+	.remove = regulator_poweroff_remove,
+	.driver = {
+		.name = "poweroff-regulator",
+		.of_match_table = of_regulator_poweroff_match,
+	},
+};
+
+module_platform_driver(regulator_poweroff_driver);
+
+MODULE_AUTHOR("Michael Klein <michael@xxxxxxxxxxxx>");
+MODULE_DESCRIPTION("Regulator poweroff driver");
+MODULE_LICENSE("GPL v2");
+MODULE_ALIAS("platform:poweroff-regulator");
-- 
2.29.2