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Message-Id: <1424283496-4479-2-git-send-email-moritz.fischer@ettus.com>
Date: Wed, 18 Feb 2015 10:18:14 -0800
From: Moritz Fischer <moritz.fischer@...us.com>
To: sre@...nel.org
Cc: dbaryshkov@...il.com, dwmw2@...radead.org,
devicetree@...r.kernel.org, linux-kernel@...r.kernel.org,
Moritz Fischer <moritz.fischer@...us.com>
Subject: [PATCH v1 1/3] power: reset: Add support for NI Ettus Research USRP E3x0 soft-poweroff.
Signed-off-by: Moritz Fischer <moritz.fischer@...us.com>
---
drivers/power/reset/Kconfig | 10 +++++
drivers/power/reset/Makefile | 1 +
drivers/power/reset/e3x0-poweroff.c | 79 +++++++++++++++++++++++++++++++++++++
3 files changed, 90 insertions(+)
diff --git a/drivers/power/reset/Kconfig b/drivers/power/reset/Kconfig
index 27f6646..7e81c93 100644
--- a/drivers/power/reset/Kconfig
+++ b/drivers/power/reset/Kconfig
@@ -48,6 +48,16 @@ config POWER_RESET_BRCMSTB
Say Y here if you have a Broadcom STB board and you wish
to have restart support.
+config POWER_RESET_E3X0
+ tristate "NI Ettus Research USRP E3x0 soft poweroff driver."
+ default n
+ help
+ Say Y here to enable support for the NI Ettus Research
+ USRP E3x0 soft poweroff.
+
+ To compile this driver as a module, chose M here: the
+ module will be called e3x0-poweroff.
+
config POWER_RESET_GPIO
bool "GPIO power-off driver"
depends on OF_GPIO
diff --git a/drivers/power/reset/Makefile b/drivers/power/reset/Makefile
index 11de15b..eef50e9a 100644
--- a/drivers/power/reset/Makefile
+++ b/drivers/power/reset/Makefile
@@ -3,6 +3,7 @@ obj-$(CONFIG_POWER_RESET_AT91_POWEROFF) += at91-poweroff.o
obj-$(CONFIG_POWER_RESET_AT91_RESET) += at91-reset.o
obj-$(CONFIG_POWER_RESET_AXXIA) += axxia-reset.o
obj-$(CONFIG_POWER_RESET_BRCMSTB) += brcmstb-reboot.o
+obj-$(CONFIG_POWER_RESET_E3X0) += e3x0-poweroff.o
obj-$(CONFIG_POWER_RESET_GPIO) += gpio-poweroff.o
obj-$(CONFIG_POWER_RESET_GPIO_RESTART) += gpio-restart.o
obj-$(CONFIG_POWER_RESET_HISI) += hisi-reboot.o
diff --git a/drivers/power/reset/e3x0-poweroff.c b/drivers/power/reset/e3x0-poweroff.c
new file mode 100644
index 0000000..767fa19
--- /dev/null
+++ b/drivers/power/reset/e3x0-poweroff.c
@@ -0,0 +1,79 @@
+/*
+ * Copyright (c) 2015, National Instruments Corp. All rights reserved.
+ *
+ * Driver for NI Ettus Research USRP E3x0 soft power off.
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; version 2 of the License.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ */
+
+#include <linux/device.h>
+#include <linux/io.h>
+#include <linux/kernel.h>
+#include <linux/module.h>
+#include <linux/of.h>
+#include <linux/platform_device.h>
+#include <linux/regmap.h>
+#include <linux/mfd/syscon.h>
+
+static const u32 SC_POWEROFF = 0x0;
+static const u32 SC_POWEROFF_MAGIC = 0x7a;
+
+static struct regmap *syscon;
+
+static void e3x0_pm_power_off(void)
+{
+ regmap_write(syscon, SC_POWEROFF, SC_POWEROFF_MAGIC);
+}
+
+static int e3x0_poweroff_probe(struct platform_device *pdev)
+{
+ struct device *dev = &pdev->dev;
+
+ syscon = syscon_regmap_lookup_by_phandle(dev->of_node, "syscon");
+ if (IS_ERR(syscon)) {
+ dev_err(dev, "Failed to get syscon");
+ return PTR_ERR(syscon);
+ }
+
+ if (!pm_power_off)
+ pm_power_off = e3x0_pm_power_off;
+
+ return 0;
+}
+
+static int e3x0_poweroff_remove(struct platform_device *pdev)
+{
+ if (pm_power_off == e3x0_pm_power_off)
+ pm_power_off = NULL;
+ return 0;
+}
+
+#ifdef CONFIG_OF
+static const struct of_device_id e3x0_poweroff_match[] = {
+ { .compatible = "ettus,e3x0-poweroff", },
+ { },
+};
+MODULE_DEVICE_TABLE(of, e3x0_poweroff_match);
+#endif
+
+static struct platform_driver e3x0_poweroff_driver = {
+ .driver = {
+ .name = "e3x0-poweroff",
+ .of_match_table = of_match_ptr(e3x0_poweroff_match),
+ },
+ .probe = e3x0_poweroff_probe,
+ .remove = e3x0_poweroff_remove,
+};
+module_platform_driver(e3x0_poweroff_driver);
+
+MODULE_LICENSE("GPL v2");
+MODULE_AUTHOR("Moritz Fischer <moritz.fischer@...us.com>");
+MODULE_DESCRIPTION("NI Ettus Research USRP E3x0 soft-poweroff driver");
+MODULE_ALIAS("platform:e3x0-poweroff");
--
1.9.3
--
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