Input: add support for NI Ettus Research USRP E3x0 button

Signed-off-by: Moritz Fischer <moritz.fischer@ettus.com>
Signed-off-by: Dmitry Torokhov <dmitry.torokhov@gmail.com>

5 files changed, 194 insertions, 0 deletions

diff --git a/Documentation/devicetree/bindings/input/e3x0-button.txt b/Documentation/devicetree/bindings/input/e3x0-button.txt
new file mode 100644
index 000000000000..751665e8e47a
--- /dev/null
+++ b/Documentation/devicetree/bindings/input/e3x0-button.txt
@@ -0,0 +1,25 @@
+National Instruments Ettus Research USRP E3x0 button driver
+
+This module is part of the NI Ettus Research USRP E3x0 SDR.
+
+This module provides a simple power button event via two interrupts.
+
+Required properties:
+- compatible: should be one of the following
+  - "ettus,e3x0-button": For devices such as the NI Ettus Research USRP E3x0
+- interrupt-parent:
+  - a phandle to the interrupt controller that it is attached to.
+- interrupts: should be one of the following
+  - <0 30 1>, <0 31 1>: For devices such as the NI Ettus Research USRP E3x0
+- interrupt-names: should be one of the following
+  - "press", "release": For devices such as the NI Ettus Research USRP E3x0
+
+Note: Interrupt numbers might vary depending on the FPGA configuration.
+
+Example:
+        button {
+                compatible = "ettus,e3x0-button";
+                interrupt-parent = <&intc>;
+                interrupts = <0 30 1>, <0 31 1>;
+                interrupt-names = "press", "release";
+        }
diff --git a/Documentation/devicetree/bindings/vendor-prefixes.txt b/Documentation/devicetree/bindings/vendor-prefixes.txt
index e6469ec7a90e..9f18b4f5cf09 100644
--- a/Documentation/devicetree/bindings/vendor-prefixes.txt
+++ b/Documentation/devicetree/bindings/vendor-prefixes.txt
@@ -48,6 +48,7 @@ epcos	EPCOS AG
 epfl    Ecole Polytechnique Fédérale de Lausanne
 epson   Seiko Epson Corp.
 est     ESTeem Wireless Modems
+ettus   NI Ettus Research
 eukrea  Eukréa Electromatique
 excito  Excito
 fsl     Freescale Semiconductor
diff --git a/drivers/input/misc/Kconfig b/drivers/input/misc/Kconfig
index 9e610c4862a2..6deb8dae3205 100644
--- a/drivers/input/misc/Kconfig
+++ b/drivers/input/misc/Kconfig
@@ -93,6 +93,16 @@ config INPUT_BMA150
           To compile this driver as a module, choose M here: the
           module will be called bma150.
 
+config INPUT_E3X0_BUTTON
+        tristate "NI Ettus Research USRP E3x0 Button support."
+        default n
+        help
+          Say Y here to enable support for the NI Ettus Research
+          USRP E3x0 Button.
+
+          To compile this driver as a module, choose M here: the
+          module will be called e3x0_button.
+
 config INPUT_PCSPKR
         tristate "PC Speaker support"
         depends on PCSPKR_PLATFORM
diff --git a/drivers/input/misc/Makefile b/drivers/input/misc/Makefile
index f8d9ea7c059a..403a1a54a76c 100644
--- a/drivers/input/misc/Makefile
+++ b/drivers/input/misc/Makefile
@@ -26,6 +26,7 @@ obj-$(CONFIG_INPUT_COBALT_BTNS)		+= cobalt_btns.o
 obj-$(CONFIG_INPUT_DA9052_ONKEY)        += da9052_onkey.o
 obj-$(CONFIG_INPUT_DA9055_ONKEY)        += da9055_onkey.o
 obj-$(CONFIG_INPUT_DM355EVM)            += dm355evm_keys.o
+obj-$(CONFIG_INPUT_E3X0_BUTTON)         += e3x0-button.o
 obj-$(CONFIG_INPUT_DRV260X_HAPTICS)     += drv260x.o
 obj-$(CONFIG_INPUT_DRV2667_HAPTICS)     += drv2667.o
 obj-$(CONFIG_INPUT_GP2A)                += gp2ap002a00f.o
diff --git a/drivers/input/misc/e3x0-button.c b/drivers/input/misc/e3x0-button.c
new file mode 100644
index 000000000000..13bfca8a7b16
--- /dev/null
+++ b/drivers/input/misc/e3x0-button.c
@@ -0,0 +1,157 @@
+/*
+ * Copyright (c) 2014, National Instruments Corp. All rights reserved.
+ *
+ * Driver for NI Ettus Research USRP E3x0 Button Driver
+ *
+ * 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/kernel.h>
+#include <linux/module.h>
+#include <linux/platform_device.h>
+#include <linux/input.h>
+#include <linux/interrupt.h>
+#include <linux/of.h>
+#include <linux/slab.h>
+
+static irqreturn_t e3x0_button_release_handler(int irq, void *data)
+{
+        struct input_dev *idev = data;
+
+        input_report_key(idev, KEY_POWER, 0);
+        input_sync(idev);
+
+        return IRQ_HANDLED;
+}
+
+static irqreturn_t e3x0_button_press_handler(int irq, void *data)
+{
+        struct input_dev *idev = data;
+
+        input_report_key(idev, KEY_POWER, 1);
+        pm_wakeup_event(idev->dev.parent, 0);
+        input_sync(idev);
+
+        return IRQ_HANDLED;
+}
+
+static int __maybe_unused e3x0_button_suspend(struct device *dev)
+{
+        struct platform_device *pdev = to_platform_device(dev);
+
+        if (device_may_wakeup(dev))
+                enable_irq_wake(platform_get_irq_byname(pdev, "press"));
+
+        return 0;
+}
+
+static int __maybe_unused e3x0_button_resume(struct device *dev)
+{
+        struct platform_device *pdev = to_platform_device(dev);
+
+        if (device_may_wakeup(dev))
+                disable_irq_wake(platform_get_irq_byname(pdev, "press"));
+
+        return 0;
+}
+
+static SIMPLE_DEV_PM_OPS(e3x0_button_pm_ops,
+                         e3x0_button_suspend, e3x0_button_resume);
+
+static int e3x0_button_probe(struct platform_device *pdev)
+{
+        struct input_dev *input;
+        int irq_press, irq_release;
+        int error;
+
+        irq_press = platform_get_irq_byname(pdev, "press");
+        if (irq_press < 0) {
+                dev_err(&pdev->dev, "No IRQ for 'press', error=%d\n",
+                        irq_press);
+                return irq_press;
+        }
+
+        irq_release = platform_get_irq_byname(pdev, "release");
+        if (irq_release < 0) {
+                dev_err(&pdev->dev, "No IRQ for 'release', error=%d\n",
+                        irq_release);
+                return irq_release;
+        }
+
+        input = devm_input_allocate_device(&pdev->dev);
+        if (!input)
+                return -ENOMEM;
+
+        input->name = "NI Ettus Research USRP E3x0 Button Driver";
+        input->phys = "e3x0_button/input0";
+        input->dev.parent = &pdev->dev;
+
+        input_set_capability(input, EV_KEY, KEY_POWER);
+
+        error = devm_request_irq(&pdev->dev, irq_press,
+                                 e3x0_button_press_handler, 0,
+                                 "e3x0-button", input);
+        if (error) {
+                dev_err(&pdev->dev, "Failed to request 'press' IRQ#%d: %d\n",
+                        irq_press, error);
+                return error;
+        }
+
+        error = devm_request_irq(&pdev->dev, irq_release,
+                                 e3x0_button_release_handler, 0,