Input: add tps65218 power button driver

With this driver, we can report KEY_POWER on AM437x SK. This patch has been
tested with said board.

Signed-off-by: Felipe Balbi <balbi@ti.com>
Signed-off-by: Dmitry Torokhov <dmitry.torokhov@gmail.com>

4 files changed, 154 insertions, 0 deletions

diff --git a/Documentation/devicetree/bindings/input/tps65218-pwrbutton.txt b/Documentation/devicetree/bindings/input/tps65218-pwrbutton.txt
new file mode 100644
index 000000000000..e30e0b93f2b3
--- /dev/null
+++ b/Documentation/devicetree/bindings/input/tps65218-pwrbutton.txt
@@ -0,0 +1,17 @@
+Texas Instruments TPS65218 power button
+
+This driver provides a simple power button event via an Interrupt.
+
+Required properties:
+- compatible: should be "ti,tps65218-pwrbutton"
+- interrupts: should be one of the following
+   - <3 IRQ_TYPE_EDGE_BOTH>: For controllers compatible with tps65218
+
+Example:
+
+&tps {
+        power-button {
+                compatible = "ti,tps65218-pwrbutton";
+                interrupts = <3 IRQ_TYPE_EDGE_BOTH>;
+        };
+};
diff --git a/drivers/input/misc/Kconfig b/drivers/input/misc/Kconfig
index 1da0a20c42ea..95919170795d 100644
--- a/drivers/input/misc/Kconfig
+++ b/drivers/input/misc/Kconfig
@@ -416,6 +416,16 @@ config INPUT_RETU_PWRBUTTON
           To compile this driver as a module, choose M here. The module will
           be called retu-pwrbutton.
 
+config INPUT_TPS65218_PWRBUTTON
+        tristate "TPS65218 Power button driver"
+        depends on MFD_TPS65218
+        help
+          Say Y here if you want to enable power buttong reporting for
+          the TPS65218 Power Management IC device.
+
+          To compile this driver as a module, choose M here. The module will
+          be called tps65218-pwrbutton.
+
 config INPUT_TWL4030_PWRBUTTON
         tristate "TWL4030 Power button Driver"
         depends on TWL4030_CORE
diff --git a/drivers/input/misc/Makefile b/drivers/input/misc/Makefile
index 1f135af4af01..9a1083f78374 100644
--- a/drivers/input/misc/Makefile
+++ b/drivers/input/misc/Makefile
@@ -60,6 +60,7 @@ 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-$(CONFIG_INPUT_TPS65218_PWRBUTTON)  += tps65218-pwrbutton.o
 obj-$(CONFIG_INPUT_TWL4030_PWRBUTTON)   += twl4030-pwrbutton.o
 obj-$(CONFIG_INPUT_TWL4030_VIBRA)       += twl4030-vibra.o
 obj-$(CONFIG_INPUT_TWL6040_VIBRA)       += twl6040-vibra.o
diff --git a/drivers/input/misc/tps65218-pwrbutton.c b/drivers/input/misc/tps65218-pwrbutton.c
new file mode 100644
index 000000000000..54508dec4eb3
--- /dev/null
+++ b/drivers/input/misc/tps65218-pwrbutton.c
@@ -0,0 +1,126 @@
+/*
+ * Texas Instruments' TPS65218 Power Button Input Driver
+ *
+ * Copyright (C) 2014 Texas Instruments Incorporated - http://www.ti.com/
+ * Author: Felipe Balbi <balbi@ti.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/tps65218.h>
+#include <linux/module.h>
+#include <linux/of.h>
+#include <linux/platform_device.h>
+#include <linux/slab.h>
+
+struct tps65218_pwrbutton {
+        struct device *dev;
+        struct tps65218 *tps;
+        struct input_dev *idev;
+};
+
+static irqreturn_t tps65218_pwr_irq(int irq, void *_pwr)
+{
+        struct tps65218_pwrbutton *pwr = _pwr;
+        unsigned int reg;
+        int error;
+
+        error = tps65218_reg_read(pwr->tps, TPS65218_REG_STATUS, &reg);
+        if (error) {
+                dev_err(pwr->dev, "can't read register: %d\n", error);
+                goto out;
+        }
+
+        if (reg & TPS65218_STATUS_PB_STATE) {
+                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 tps65218_pwron_probe(struct platform_device *pdev)
+{
+        struct tps65218 *tps = dev_get_drvdata(pdev->dev.parent);
+        struct device *dev = &pdev->dev;
+        struct tps65218_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 = "tps65218_pwrbutton";
+        idev->phys = "tps65218_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(pdev, 0);
+        error = devm_request_threaded_irq(dev, irq, NULL, tps65218_pwr_irq,
+                                          IRQF_TRIGGER_RISING |
+                                                IRQF_TRIGGER_FALLING |
+                                                IRQF_ONESHOT,
+                                          "tps65218-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 struct of_device_id of_tps65218_pwr_match[] = {
+        { .compatible = "ti,tps65218-pwrbutton" },
+        { },
+};
+MODULE_DEVICE_TABLE(of, of_tps65218_pwr_match);
+
+static struct platform_driver tps65218_pwron_driver = {
+        .probe  = tps65218_pwron_probe,
+        .driver = {
+                .name   = "tps65218_pwrbutton",
+                .of_match_table = of_tps65218_pwr_match,
+        },
+};
+module_platform_driver(tps65218_pwron_driver);
+
+MODULE_DESCRIPTION("TPS65218 Power Button");
+MODULE_LICENSE("GPL v2");
+MODULE_AUTHOR("Felipe Balbi <balbi@ti.com>");