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>

diff --git a/Documentation/devicetree/bindings/input/e3x0-button.txt b/Documentation/devicetree/bindings/input/e3x0-button.txt
new file mode 100644 (file)
index 0000000..751665e
--- /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 e6469ec..9f18b4f 100644 (file)
--- 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 9e610c4..6deb8da 100644 (file)
--- 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 f8d9ea7..403a1a5 100644 (file)
--- 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 (file)
index 0000000..13bfca8
--- /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,
+                                "e3x0-button", input);
+       if (error) {
+               dev_err(&pdev->dev, "Failed to request 'release' IRQ#%d: %d\n",
+                       irq_release, error);
+               return error;
+       }
+
+       error = input_register_device(input);
+       if (error) {
+               dev_err(&pdev->dev, "Can't register input device: %d\n", error);
+               return error;
+       }
+
+       platform_set_drvdata(pdev, input);
+       device_init_wakeup(&pdev->dev, 1);
+       return 0;
+}
+
+static int e3x0_button_remove(struct platform_device *pdev)
+{
+       device_init_wakeup(&pdev->dev, 0);
+       return 0;
+}
+
+#ifdef CONFIG_OF
+static const struct of_device_id e3x0_button_match[] = {
+       { .compatible = "ettus,e3x0-button", },
+       { }
+};
+MODULE_DEVICE_TABLE(of, e3x0_button_match);
+#endif
+
+static struct platform_driver e3x0_button_driver = {
+       .driver         = {
+               .name   = "e3x0-button",
+               .of_match_table = of_match_ptr(e3x0_button_match),
+               .pm     = &e3x0_button_pm_ops,
+       },
+       .probe          = e3x0_button_probe,
+       .remove         = e3x0_button_remove,
+};
+
+module_platform_driver(e3x0_button_driver);
+
+MODULE_LICENSE("GPL v2");
+MODULE_AUTHOR("Moritz Fischer <moritz.fischer@ettus.com>");
+MODULE_DESCRIPTION("NI Ettus Research USRP E3x0 Button driver");
+MODULE_ALIAS("platform:e3x0-button");