Input: add support for PowerOn button on the AB8500 MFD

Add the PowerOn (PonKey) button support to detect power on/off events.

Acked-by: Linus Walleij <linus.walleij@stericsson.com>
Signed-off-by: Sundar R Iyer <sundar.iyer@stericsson.com>
Signed-off-by: Dmitry Torokhov <dtor@mail.ru>

3 files changed, 168 insertions, 0 deletions

diff --git a/drivers/input/misc/Kconfig b/drivers/input/misc/Kconfig
index b49e23379723..b99b8cbde02f 100644
--- a/drivers/input/misc/Kconfig
+++ b/drivers/input/misc/Kconfig
@@ -22,6 +22,16 @@ config INPUT_88PM860X_ONKEY
 	  To compile this driver as a module, choose M here: the module
 	  will be called 88pm860x_onkey.
 
+config INPUT_AB8500_PONKEY
+	tristate "AB8500 Pon (PowerOn) Key"
+	depends on AB8500_CORE
+	help
+	  Say Y here to use the PowerOn Key for ST-Ericsson's AB8500
+	  Mix-Sig PMIC.
+
+	  To compile this driver as a module, choose M here: the module
+	  will be called ab8500-ponkey.
+
 config INPUT_AD714X
 	tristate "Analog Devices AD714x Capacitance Touch Sensor"
 	help
diff --git a/drivers/input/misc/Makefile b/drivers/input/misc/Makefile
index 19ccca78fa76..1fe1f6c8b737 100644
--- a/drivers/input/misc/Makefile
+++ b/drivers/input/misc/Makefile
@@ -5,6 +5,7 @@
 # Each configuration option enables a list of files.
 
 obj-$(CONFIG_INPUT_88PM860X_ONKEY)	+= 88pm860x_onkey.o
+obj-$(CONFIG_INPUT_AB8500_PONKEY)	+= ab8500-ponkey.o
 obj-$(CONFIG_INPUT_AD714X)		+= ad714x.o
 obj-$(CONFIG_INPUT_AD714X_I2C)		+= ad714x-i2c.o
 obj-$(CONFIG_INPUT_AD714X_SPI)		+= ad714x-spi.o
diff --git a/drivers/input/misc/ab8500-ponkey.c b/drivers/input/misc/ab8500-ponkey.c
new file mode 100644
index 000000000000..98f8ede504b8
--- /dev/null
+++ b/drivers/input/misc/ab8500-ponkey.c
@@ -0,0 +1,157 @@
+/*
+ * Copyright (C) ST-Ericsson SA 2010
+ *
+ * License Terms: GNU General Public License v2
+ * Author: Sundar Iyer <sundar.iyer@stericsson.com> for ST-Ericsson
+ *
+ * AB8500 Power-On Key handler
+ */
+
+#include <linux/kernel.h>
+#include <linux/module.h>
+#include <linux/platform_device.h>
+#include <linux/input.h>
+#include <linux/interrupt.h>
+#include <linux/mfd/ab8500.h>
+#include <linux/slab.h>
+
+/**
+ * struct ab8500_ponkey - ab8500 ponkey information
+ * @input_dev: pointer to input device
+ * @ab8500: ab8500 parent
+ * @irq_dbf: irq number for falling transition
+ * @irq_dbr: irq number for rising transition
+ */
+struct ab8500_ponkey {
+	struct input_dev	*idev;
+	struct ab8500		*ab8500;
+	int			irq_dbf;
+	int			irq_dbr;
+};
+
+/* AB8500 gives us an interrupt when ONKEY is held */
+static irqreturn_t ab8500_ponkey_handler(int irq, void *data)
+{
+	struct ab8500_ponkey *ponkey = data;
+
+	if (irq == ponkey->irq_dbf)
+		input_report_key(ponkey->idev, KEY_POWER, true);
+	else if (irq == ponkey->irq_dbr)
+		input_report_key(ponkey->idev, KEY_POWER, false);
+
+	input_sync(ponkey->idev);
+
+	return IRQ_HANDLED;
+}
+
+static int __devinit ab8500_ponkey_probe(struct platform_device *pdev)
+{
+	struct ab8500 *ab8500 = dev_get_drvdata(pdev->dev.parent);
+	struct ab8500_ponkey *ponkey;
+	struct input_dev *input;
+	int irq_dbf, irq_dbr;
+	int error;
+
+	irq_dbf = platform_get_irq_byname(pdev, "ONKEY_DBF");
+	if (irq_dbf < 0) {
+		dev_err(&pdev->dev, "No IRQ for ONKEY_DBF, error=%d\n", irq_dbf);
+		return irq_dbf;
+	}
+
+	irq_dbr = platform_get_irq_byname(pdev, "ONKEY_DBR");
+	if (irq_dbr < 0) {
+		dev_err(&pdev->dev, "No IRQ for ONKEY_DBR, error=%d\n", irq_dbr);
+		return irq_dbr;
+	}
+
+	ponkey = kzalloc(sizeof(struct ab8500_ponkey), GFP_KERNEL);
+	input = input_allocate_device();
+	if (!ponkey || !input) {
+		error = -ENOMEM;
+		goto err_free_mem;
+	}
+
+	ponkey->idev = input;
+	ponkey->ab8500 = ab8500;
+	ponkey->irq_dbf = irq_dbf;
+	ponkey->irq_dbr = irq_dbr;
+
+	input->name = "AB8500 POn(PowerOn) Key";
+	input->dev.parent = &pdev->dev;
+
+	input_set_capability(input, EV_KEY, KEY_POWER);
+
+	error = request_any_context_irq(ponkey->irq_dbf, ab8500_ponkey_handler,
+					0, "ab8500-ponkey-dbf", ponkey);
+	if (error < 0) {
+		dev_err(ab8500->dev, "Failed to request dbf IRQ#%d: %d\n",
+			ponkey->irq_dbf, error);
+		goto err_free_mem;
+	}
+
+	error = request_any_context_irq(ponkey->irq_dbr, ab8500_ponkey_handler,
+					0, "ab8500-ponkey-dbr", ponkey);
+	if (error < 0) {
+		dev_err(ab8500->dev, "Failed to request dbr IRQ#%d: %d\n",
+			ponkey->irq_dbr, error);
+		goto err_free_dbf_irq;
+	}
+
+	error = input_register_device(ponkey->idev);
+	if (error) {
+		dev_err(ab8500->dev, "Can't register input device: %d\n", error);
+		goto err_free_dbr_irq;
+	}
+
+	platform_set_drvdata(pdev, ponkey);
+	return 0;
+
+err_free_dbr_irq:
+	free_irq(ponkey->irq_dbf, ponkey);
+err_free_dbf_irq:
+	free_irq(ponkey->irq_dbf, ponkey);
+err_free_mem:
+	input_free_device(input);
+	kfree(ponkey);
+
+	return error;
+}
+
+static int __devexit ab8500_ponkey_remove(struct platform_device *pdev)
+{
+	struct ab8500_ponkey *ponkey = platform_get_drvdata(pdev);
+
+	free_irq(ponkey->irq_dbf, ponkey);
+	free_irq(ponkey->irq_dbr, ponkey);
+	input_unregister_device(ponkey->idev);
+	kfree(ponkey);
+
+	platform_set_drvdata(pdev, NULL);
+
+	return 0;
+}
+
+static struct platform_driver ab8500_ponkey_driver = {
+	.driver		= {
+		.name	= "ab8500-poweron-key",
+		.owner	= THIS_MODULE,
+	},
+	.probe		= ab8500_ponkey_probe,
+	.remove		= __devexit_p(ab8500_ponkey_remove),
+};
+
+static int __init ab8500_ponkey_init(void)
+{
+	return platform_driver_register(&ab8500_ponkey_driver);
+}
+module_init(ab8500_ponkey_init);
+
+static void __exit ab8500_ponkey_exit(void)
+{
+	platform_driver_unregister(&ab8500_ponkey_driver);
+}
+module_exit(ab8500_ponkey_exit);
+
+MODULE_LICENSE("GPL v2");
+MODULE_AUTHOR("Sundar Iyer <sundar.iyer@stericsson.com>");
+MODULE_DESCRIPTION("ST-Ericsson AB8500 Power-ON(Pon) Key driver");