INPUT: KEY: Add Power button input key event driver

This patch adds palmas power button as a input event driver. This
will be mapped as power button key in the userland.

Change-Id: Ifedb13322cf1fc8658247fe47eeca423657497b3
Signed-off-by: Girish S G <girishsg@ti.com>
Signed-off-by: Keerthy <j-keerthy@ti.com>

2 files changed, 153 insertions, 0 deletions

diff --git a/drivers/input/misc/Makefile b/drivers/input/misc/Makefile
index 9224870fa8b..d01354e8b38 100644
--- a/drivers/input/misc/Makefile
+++ b/drivers/input/misc/Makefile
@@ -55,6 +55,7 @@ obj-$(CONFIG_INPUT_GPIO_ROTARY_ENCODER)	+= rotary_encoder.o
 obj-$(CONFIG_INPUT_SGI_BTNS)		+= sgi_btns.o
 obj-$(CONFIG_INPUT_SPARCSPKR)		+= sparcspkr.o
 obj-$(CONFIG_INPUT_TWL4030_PWRBUTTON)	+= twl4030-pwrbutton.o
+obj-$(CONFIG_INPUT_PALMAS_PWRBUTTON)	+= palmas-pwrbutton.o
 obj-$(CONFIG_INPUT_TWL4030_VIBRA)	+= twl4030-vibra.o
 obj-$(CONFIG_INPUT_TWL6040_VIBRA)	+= twl6040-vibra.o
 obj-$(CONFIG_INPUT_UINPUT)		+= uinput.o
diff --git a/drivers/input/misc/palmas-pwrbutton.c b/drivers/input/misc/palmas-pwrbutton.c
new file mode 100644
index 00000000000..7cf30eb7143
--- /dev/null
+++ b/drivers/input/misc/palmas-pwrbutton.c
@@ -0,0 +1,152 @@
+/**
+ * palmas-pwrbutton.c - Palmas Power Button Input Driver
+ *
+ * Copyright (C) 2012 Texas Instrument Inc
+ *
+ * Written by Girish S Ghongdemath <girishsg@ti.com>
+ * Based on twl4030-pwrbutton.c driver.
+ *
+ * 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.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
+ */
+
+#include <linux/module.h>
+#include <linux/init.h>
+#include <linux/kernel.h>
+#include <linux/slab.h>
+#include <linux/errno.h>
+#include <linux/input.h>
+#include <linux/interrupt.h>
+#include <linux/platform_device.h>
+#include <linux/mfd/palmas.h>
+
+struct palmas_pwron {
+	struct palmas *palmas;
+	struct input_dev *input_dev;
+};
+
+static irqreturn_t pwron_irq(int irq, void *palmas_pwron)
+{
+	struct palmas_pwron *pwron = palmas_pwron;
+	struct input_dev *input_dev = pwron->input_dev;
+	int err;
+	u8 value;
+
+	err = pwron->palmas->read(pwron->palmas, PALMAS_INTERRUPT_BASE,
+				  PALMAS_INT1_STATUS, &value);
+	if (!err) {
+		input_report_key(input_dev, KEY_POWER,
+				  value & INT1_STATUS_PWRON);
+		input_report_key(input_dev, KEY_POWER, 0);
+		input_sync(input_dev);
+	} else {
+		dev_err(input_dev->dev.parent, "Palmas: i2c error %d while"
+			"reading\n", err);
+	}
+
+	return IRQ_HANDLED;
+}
+
+static int __init palmas_pwron_probe(struct platform_device *pdev)
+{
+	struct palmas *palmas = dev_get_drvdata(pdev->dev.parent);
+	struct input_dev *input_dev;
+	struct palmas_pwron *pwron;
+	int irq = platform_get_irq_byname(pdev, "PWRON_BUTTON");
+	int err;
+
+	pwron = kzalloc(sizeof(*pwron), GFP_KERNEL);
+	if (!pwron) {
+		dev_err(&pdev->dev, "PWRON memory allocation failed\n");
+		return -ENOMEM;
+	}
+
+	input_dev = input_allocate_device();
+	if (!input_dev) {
+			dev_err(&pdev->dev, "input_dev memory allocation failed\n");
+			err = -ENOMEM;
+			goto free_pwron;
+	}
+
+	input_dev->evbit[0] = BIT_MASK(EV_KEY);
+	input_dev->keybit[BIT_WORD(KEY_POWER)] = BIT_MASK(KEY_POWER);
+	input_dev->name = "palmas_pwron";
+	input_dev->phys = "palmas_pwron/input0";
+	input_dev->dev.parent = &pdev->dev;
+
+	pwron->palmas = palmas;
+	pwron->input_dev = input_dev;
+
+	err = request_threaded_irq(irq, NULL, pwron_irq,
+			IRQF_TRIGGER_FALLING | IRQF_TRIGGER_RISING,
+			"palmas_pwron", pwron);
+	if (err < 0) {
+		dev_err(&pdev->dev, "Can't get IRQ for pwron: %d\n", err);
+		goto free_input_dev;
+	}
+
+	err = input_register_device(input_dev);
+	if (err) {
+		dev_dbg(&pdev->dev, "Can't register power button: %d\n", err);
+		goto free_irq;
+	}
+
+	platform_set_drvdata(pdev, input_dev);
+
+	return 0;
+
+free_irq:
+	free_irq(irq, input_dev);
+free_input_dev:
+	input_free_device(input_dev);
+free_pwron:
+	kfree(pwron);
+	return err;
+}
+
+static int __exit palmas_pwron_remove(struct platform_device *pdev)
+{
+	struct input_dev *input_dev = platform_get_drvdata(pdev);
+	int irq = platform_get_irq(pdev, 0);
+
+	free_irq(irq, input_dev);
+	input_unregister_device(input_dev);
+
+	return 0;
+}
+
+static struct platform_driver palmas_pwron_driver = {
+	.remove		= __exit_p(palmas_pwron_remove),
+	.driver		= {
+		.name	= "palmas_pwron",
+		.owner	= THIS_MODULE,
+	},
+};
+
+static int __init palmas_pwron_init(void)
+{
+	return platform_driver_probe(&palmas_pwron_driver,
+			palmas_pwron_probe);
+}
+module_init(palmas_pwron_init);
+
+static void __exit palmas_pwron_exit(void)
+{
+	platform_driver_unregister(&palmas_pwron_driver);
+}
+module_exit(palmas_pwron_exit);
+
+MODULE_ALIAS("platform:palmas_pwrbutton");
+MODULE_DESCRIPTION("Palmas Power Button");
+MODULE_LICENSE("GPL");
+MODULE_AUTHOR("Girish S Ghongdemath <girishsg@ti.com>");