[PATCH v3 5/5] Input: Add tps65217 power button driver

Marcin Niestroj
2016-06-16T11:41:27Z

This driver enables us to use tps65217's power button as KEY_POWER on
am335x boards (directly connected button in chiliboard, accessible pin
via expansion header in beaglebone). This patch has been tested with
chiliboard.

Signed-off-by: Marcin Niestroj <m.niestroj@grinn-global.com>
---
depends on patches 1-4 in series

.../bindings/input/tps65217-pwrbutton.txt | 17 +++
drivers/input/misc/Kconfig | 10 ++
drivers/input/misc/Makefile | 1 +
drivers/input/misc/tps65217-pwrbutton.c | 131 +++++++++++++++++++++
4 files changed, 159 insertions(+)
create mode 100644 Documentation/devicetree/bindings/input/tps65217-pwrbutton.txt
create mode 100644 drivers/input/misc/tps65217-pwrbutton.c

diff --git a/Documentation/devicetree/bindings/input/tps65217-pwrbutton.txt b/Documentation/devicetree/bindings/input/tps65217-pwrbutton.txt
new file mode 100644
index 0000000..d5f5cce
--- /dev/null
+++ b/Documentation/devicetree/bindings/input/tps65217-pwrbutton.txt
@@ -0,0 +1,17 @@
+Texas Instruments TPS65217 power button
+
+This module is part of the TPS65217. For more details about the whole
+chip see Documentation/devicetree/bindings/regulator/tps65217.txt.
+
+This module provides a simple power button event via an Interrupt.
+
+Required properties:
+- compatible: should be "ti,tps65217-pwrbutton"
+
+Example:
+
+&tps {
+ tps65217-pwrbutton {
+ compatible = "ti,tps65217-pwrbutton";
+ };
+};
diff --git a/drivers/input/misc/Kconfig b/drivers/input/misc/Kconfig
index 1f2337a..2649400 100644
--- a/drivers/input/misc/Kconfig
+++ b/drivers/input/misc/Kconfig
@@ -438,6 +438,16 @@ config INPUT_RETU_PWRBUTTON
To compile this driver as a module, choose M here. The module will
be called retu-pwrbutton.

+config INPUT_TPS65217_PWRBUTTON
+ tristate "TPS65217 Power button driver"
+ depends on MFD_TPS65217
+ help
+ Say Y here if you want to enable power button reporting for
+ the TPS65217 Power Management IC device.
+
+ To compile this driver as a module, choose M here. The module will
+ be called tps65217-pwrbutton.
+
config INPUT_TPS65218_PWRBUTTON
tristate "TPS65218 Power button driver"
depends on MFD_TPS65218
diff --git a/drivers/input/misc/Makefile b/drivers/input/misc/Makefile
index 0357a08..651cafc 100644
--- a/drivers/input/misc/Makefile
+++ b/drivers/input/misc/Makefile
@@ -65,6 +65,7 @@ obj-$(CONFIG_INPUT_SGI_BTNS) += sgi_btns.o
obj-$(CONFIG_INPUT_SIRFSOC_ONKEY) += sirfsoc-onkey.o
obj-$(CONFIG_INPUT_SOC_BUTTON_ARRAY) += soc_button_array.o
obj-$(CONFIG_INPUT_SPARCSPKR) += sparcspkr.o
+obj-$(CONFIG_INPUT_TPS65217_PWRBUTTON) += tps65217-pwrbutton.o
obj-$(CONFIG_INPUT_TPS65218_PWRBUTTON) += tps65218-pwrbutton.o
obj-$(CONFIG_INPUT_TWL4030_PWRBUTTON) += twl4030-pwrbutton.o
obj-$(CONFIG_INPUT_TWL4030_VIBRA) += twl4030-vibra.o
diff --git a/drivers/input/misc/tps65217-pwrbutton.c b/drivers/input/misc/tps65217-pwrbutton.c
new file mode 100644
index 0000000..50372bf
--- /dev/null
+++ b/drivers/input/misc/tps65217-pwrbutton.c
@@ -0,0 +1,131 @@
+/*
+ * Texas Instruments' TPS65217 Power Button Input Driver
+ *
+ * Copyright (C) 2016 Grinn - http://www.grinn-global.com/
+ * Author: Marcin Niestroj <m.niestroj@grinn-global.com>
+ *
+ * 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.
+ *
+ * This program is distributed "as is" WITHOUT ANY WARRANTY of any
+ * kind, whether express or implied; without even the implied warranty
+ * of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ */
+
+#include <linux/init.h>
+#include <linux/input.h>
+#include <linux/interrupt.h>
+#include <linux/kernel.h>
+#include <linux/mfd/tps65217.h>
+#include <linux/module.h>
+#include <linux/of.h>
+#include <linux/platform_device.h>
+#include <linux/slab.h>
+
+struct tps65217_pwrbutton {
+ struct device *dev;
+ struct tps65217 *tps;
+ struct input_dev *idev;
+};
+
+static irqreturn_t tps65217_pb_irq(int irq, void *data)
+{
+ struct tps65217_pwrbutton *pwr = data;
+ unsigned int reg;
+ int error;
+
+ error = tps65217_reg_read(pwr->tps, TPS65217_REG_STATUS, &reg);
+ if (error) {
+ dev_err(pwr->dev, "can't read register: %d\n", error);
+ goto out;
+ }
+
+ if (reg & TPS65217_STATUS_PB) {
+ input_report_key(pwr->idev, KEY_POWER, 1);
+ pm_wakeup_event(pwr->dev, 0);
+ } else {
+ input_report_key(pwr->idev, KEY_POWER, 0);
+ }
+
+ input_sync(pwr->idev);
+
+out:
+ return IRQ_HANDLED;
+}
+
+static int tps65217_pb_probe(struct platform_device *pdev)
+{
+ struct tps65217 *tps = dev_get_drvdata(pdev->dev.parent);
+ struct device *dev = &pdev->dev;
+ struct tps65217_pwrbutton *pwr;
+ struct input_dev *idev;
+ int error;
+ int irq;
+
+ pwr = devm_kzalloc(dev, sizeof(*pwr), GFP_KERNEL);
+ if (!pwr)
+ return -ENOMEM;
+
+ idev = devm_input_allocate_device(dev);
+ if (!idev)
+ return -ENOMEM;
+
+ idev->name = "tps65217_pwrbutton";
+ idev->phys = "tps65217_pwrbutton/input0";
+ idev->dev.parent = dev;
+ idev->id.bustype = BUS_I2C;
+
+ input_set_capability(idev, EV_KEY, KEY_POWER);
+
+ pwr->tps = tps;
+ pwr->dev = dev;
+ pwr->idev = idev;
+ platform_set_drvdata(pdev, pwr);
+ device_init_wakeup(dev, true);
+
+ irq = platform_get_irq_byname(pdev, "PB");
+ if (irq < 0) {
+ dev_err(dev, "No IRQ resource!\n");
+ return -EINVAL;
+ }
+
+ error = devm_request_threaded_irq(dev, irq, NULL, tps65217_pb_irq,
+ IRQF_TRIGGER_RISING |
+ IRQF_TRIGGER_FALLING |
+ IRQF_ONESHOT,
+ "tps65217-pwrbutton", pwr);
+ if (error) {
+ dev_err(dev, "failed to request IRQ #%d: %d\n",
+ irq, error);
+ return error;
+ }
+
+ error = input_register_device(idev);
+ if (error) {
+ dev_err(dev, "Can't register power button: %d\n", error);
+ return error;
+ }
+
+ return 0;
+}
+
+static const struct of_device_id tps65217_pb_match[] = {
+ { .compatible = "ti,tps65217-pwrbutton" },
+ { },
+};
+MODULE_DEVICE_TABLE(of, tps65217_pb_match);
+
+static struct platform_driver tps65217_pb_driver = {
+ .probe = tps65217_pb_probe,
+ .driver = {
+ .name = "tps65217-pwrbutton",
+ .of_match_table = tps65217_pb_match,
+ },
+};
+module_platform_driver(tps65217_pb_driver);
+
+MODULE_DESCRIPTION("TPS65217 Power Button");
+MODULE_LICENSE("GPL v2");
+MODULE_AUTHOR("Marcin Niestroj <m.niestroj@grinn-global.com>");
--
2.8.3