Input: add Retu power button driver.

Signed-off-by: Aaro Koskinen <aaro.koskinen@iki.fi>
Acked-by: Felipe Balbi <balbi@ti.com>
Signed-off-by: Dmitry Torokhov <dmitry.torokhov@gmail.com>

3 files changed, 110 insertions, 0 deletions

diff --git a/drivers/input/misc/Kconfig b/drivers/input/misc/Kconfig
index 0f959d744e74..2a1647ef5610 100644
--- a/drivers/input/misc/Kconfig
+++ b/drivers/input/misc/Kconfig
@@ -364,6 +364,16 @@ config INPUT_CM109
           To compile this driver as a module, choose M here: the module will be
           called cm109.
 
+config INPUT_RETU_PWRBUTTON
+        tristate "Retu Power button Driver"
+        depends on MFD_RETU
+        help
+          Say Y here if you want to enable power key reporting via the
+          Retu chips found in Nokia Internet Tablets (770, N800, N810).
+
+          To compile this driver as a module, choose M here. The module will
+          be called retu-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 23347e3f7e96..1f874afeea6a 100644
--- a/drivers/input/misc/Makefile
+++ b/drivers/input/misc/Makefile
@@ -46,6 +46,7 @@ obj-$(CONFIG_INPUT_PMIC8XXX_PWRKEY)	+= pmic8xxx-pwrkey.o
 obj-$(CONFIG_INPUT_POWERMATE)           += powermate.o
 obj-$(CONFIG_INPUT_PWM_BEEPER)          += pwm-beeper.o
 obj-$(CONFIG_INPUT_RB532_BUTTON)        += rb532_button.o
+obj-$(CONFIG_INPUT_RETU_PWRBUTTON)      += retu-pwrbutton.o
 obj-$(CONFIG_INPUT_GPIO_ROTARY_ENCODER) += rotary_encoder.o
 obj-$(CONFIG_INPUT_SGI_BTNS)            += sgi_btns.o
 obj-$(CONFIG_INPUT_SPARCSPKR)           += sparcspkr.o
diff --git a/drivers/input/misc/retu-pwrbutton.c b/drivers/input/misc/retu-pwrbutton.c
new file mode 100644
index 000000000000..3767f43ce37e
--- /dev/null
+++ b/drivers/input/misc/retu-pwrbutton.c
@@ -0,0 +1,99 @@
+/*
+ * Retu power button driver.
+ *
+ * Copyright (C) 2004-2010 Nokia Corporation
+ *
+ * Original code written by Ari Saastamoinen, Juha Yrjölä and Felipe Balbi.
+ * Rewritten by Aaro Koskinen.
+ *
+ * This file is subject to the terms and conditions of the GNU General
+ * Public License. See the file "COPYING" in the main directory of this
+ * archive for more details.
+ *
+ * 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/irq.h>
+#include <linux/init.h>
+#include <linux/slab.h>
+#include <linux/errno.h>
+#include <linux/input.h>
+#include <linux/kernel.h>
+#include <linux/module.h>
+#include <linux/mfd/retu.h>
+#include <linux/interrupt.h>
+#include <linux/platform_device.h>
+
+#define RETU_STATUS_PWRONX (1 << 5)
+
+static irqreturn_t retu_pwrbutton_irq(int irq, void *_pwr)
+{
+        struct input_dev *idev = _pwr;
+        struct retu_dev *rdev = input_get_drvdata(idev);
+        bool state;
+
+        state = !(retu_read(rdev, RETU_REG_STATUS) & RETU_STATUS_PWRONX);
+        input_report_key(idev, KEY_POWER, state);
+        input_sync(idev);
+
+        return IRQ_HANDLED;
+}
+
+static int __devinit retu_pwrbutton_probe(struct platform_device *pdev)
+{
+        struct retu_dev *rdev = dev_get_drvdata(pdev->dev.parent);
+        struct input_dev *idev;
+        int irq;
+        int error;
+
+        irq = platform_get_irq(pdev, 0);
+        if (irq < 0)
+                return irq;
+
+        idev = devm_input_allocate_device(&pdev->dev);
+        if (!idev)
+                return -ENOMEM;
+
+        idev->name = "retu-pwrbutton";
+        idev->dev.parent = &pdev->dev;
+
+        input_set_capability(idev, EV_KEY, KEY_POWER);
+        input_set_drvdata(idev, rdev);
+
+        error = devm_request_threaded_irq(&pdev->dev, irq,
+                                          NULL, retu_pwrbutton_irq, 0,
+                                          "retu-pwrbutton", idev);
+        if (error)
+                return error;
+
+        error = input_register_device(idev);
+        if (error)
+                return error;
+
+        return 0;
+}
+
+static int __devexit retu_pwrbutton_remove(struct platform_device *pdev)
+{
+        return 0;
+}
+
+static struct platform_driver retu_pwrbutton_driver = {
+        .probe          = retu_pwrbutton_probe,
+        .remove         = __devexit_p(retu_pwrbutton_remove),
+        .driver         = {
+                .name   = "retu-pwrbutton",
+                .owner  = THIS_MODULE,
+        },
+};
+module_platform_driver(retu_pwrbutton_driver);
+
+MODULE_ALIAS("platform:retu-pwrbutton");
+MODULE_DESCRIPTION("Retu Power Button");
+MODULE_AUTHOR("Ari Saastamoinen");
+MODULE_AUTHOR("Felipe Balbi");
+MODULE_AUTHOR("Aaro Koskinen <aaro.koskinen@iki.fi>");
+MODULE_LICENSE("GPL");