Input: add DA9055 Onkey driver

This is the ONKEY driver of the Dialog DA9055 PMIC and depends on the
DA9055 MFD core driver.

This driver was functionally tested on SMDK6410 board.

Signed-off-by: David Dajun Chen <dchen@diasemi.com>
Signed-off-by: Ashish Jangam <ashish.jangam@kpitcummins.com>
Signed-off-by: Dmitry Torokhov <dmitry.torokhov@gmail.com>

drivers/input/misc/Kconfig

@@ -483,6 +483,16 @@ config INPUT_DA9052_ONKEY
 	  To compile this driver as a module, choose M here: the
 	  module will be called da9052_onkey.
 
+config INPUT_DA9055_ONKEY
+	tristate "Dialog Semiconductor DA9055 ONKEY"
+	depends on MFD_DA9055
+	help
+	  Support the ONKEY of DA9055 PMICs as an input device
+	  reporting power button status.
+
+	  To compile this driver as a module, choose M here: the module
+	  will be called da9055_onkey.
+
 config INPUT_DM355EVM
 	tristate "TI DaVinci DM355 EVM Keypad and IR Remote"
 	depends on MFD_DM355EVM_MSP

drivers/input/misc/Makefile

@@ -23,6 +23,7 @@ obj-$(CONFIG_INPUT_CMA3000)		+= cma3000_d0x.o
 obj-$(CONFIG_INPUT_CMA3000_I2C)		+= cma3000_d0x_i2c.o
 obj-$(CONFIG_INPUT_COBALT_BTNS)		+= cobalt_btns.o
 obj-$(CONFIG_INPUT_DA9052_ONKEY)	+= da9052_onkey.o
+obj-$(CONFIG_INPUT_DA9055_ONKEY)	+= da9055_onkey.o
 obj-$(CONFIG_INPUT_DM355EVM)		+= dm355evm_keys.o
 obj-$(CONFIG_INPUT_GP2A)		+= gp2ap002a00f.o
 obj-$(CONFIG_INPUT_GPIO_TILT_POLLED)	+= gpio_tilt_polled.o

drivers/input/misc/da9055_onkey.c

@@ -0,0 +1,171 @@
+/*
+ * ON pin driver for Dialog DA9055 PMICs
+ *
+ * Copyright(c) 2012 Dialog Semiconductor Ltd.
+ *
+ * Author: David Dajun Chen <dchen@diasemi.com>
+ *
+ * This program is free software; you can redistribute  it and/or modify it
+ * under  the terms of  the GNU General  Public License as published by the
+ * Free Software Foundation;  either version 2 of the  License, or (at your
+ * option) any later version.
+ */
+
+#include <linux/init.h>
+#include <linux/input.h>
+#include <linux/module.h>
+#include <linux/platform_device.h>
+
+#include <linux/mfd/da9055/core.h>
+#include <linux/mfd/da9055/reg.h>
+
+struct da9055_onkey {
+	struct da9055 *da9055;
+	struct input_dev *input;
+	struct delayed_work work;
+};
+
+static void da9055_onkey_query(struct da9055_onkey *onkey)
+{
+	int key_stat;
+
+	key_stat = da9055_reg_read(onkey->da9055, DA9055_REG_STATUS_A);
+	if (key_stat < 0) {
+		dev_err(onkey->da9055->dev,
+			"Failed to read onkey event %d\n", key_stat);
+	} else {
+		key_stat &= DA9055_NOKEY_STS;
+		/*
+		 * Onkey status bit is cleared when onkey button is relased.
+		 */
+		if (!key_stat) {
+			input_report_key(onkey->input, KEY_POWER, 0);
+			input_sync(onkey->input);
+		}
+	}
+
+	/*
+	 * Interrupt is generated only when the ONKEY pin is asserted.
+	 * Hence the deassertion of the pin is simulated through work queue.
+	 */
+	if (key_stat)
+		schedule_delayed_work(&onkey->work, msecs_to_jiffies(10));
+
+}
+
+static void da9055_onkey_work(struct work_struct *work)
+{
+	struct da9055_onkey *onkey = container_of(work, struct da9055_onkey,
+						  work.work);
+
+	da9055_onkey_query(onkey);
+}
+
+static irqreturn_t da9055_onkey_irq(int irq, void *data)
+{
+	struct da9055_onkey *onkey = data;
+
+	input_report_key(onkey->input, KEY_POWER, 1);
+	input_sync(onkey->input);
+
+	da9055_onkey_query(onkey);
+
+	return IRQ_HANDLED;
+}
+
+static int __devinit da9055_onkey_probe(struct platform_device *pdev)
+{
+	struct da9055 *da9055 = dev_get_drvdata(pdev->dev.parent);
+	struct da9055_onkey *onkey;
+	struct input_dev *input_dev;
+	int irq, err;
+
+	irq = platform_get_irq_byname(pdev, "ONKEY");
+	if (irq < 0) {
+		dev_err(&pdev->dev,
+			"Failed to get an IRQ for input device, %d\n", irq);
+		return -EINVAL;
+	}
+
+	onkey = devm_kzalloc(&pdev->dev, sizeof(*onkey), GFP_KERNEL);
+	if (!onkey) {
+		dev_err(&pdev->dev, "Failed to allocate memory\n");
+		return -ENOMEM;
+	}
+
+	input_dev = input_allocate_device();
+	if (!input_dev) {
+		dev_err(&pdev->dev, "Failed to allocate memory\n");
+		return -ENOMEM;
+	}
+
+	onkey->input = input_dev;
+	onkey->da9055 = da9055;
+	input_dev->name = "da9055-onkey";
+	input_dev->phys = "da9055-onkey/input0";
+	input_dev->dev.parent = &pdev->dev;
+
+	input_dev->evbit[0] = BIT_MASK(EV_KEY);
+	__set_bit(KEY_POWER, input_dev->keybit);
+
+	INIT_DELAYED_WORK(&onkey->work, da9055_onkey_work);
+
+	irq = regmap_irq_get_virq(da9055->irq_data, irq);
+	err = request_threaded_irq(irq, NULL, da9055_onkey_irq,
+				   IRQF_TRIGGER_HIGH | IRQF_ONESHOT,
+				   "ONKEY", onkey);
+	if (err < 0) {
+		dev_err(&pdev->dev,
+			"Failed to register ONKEY IRQ %d, error = %d\n",
+			irq, err);
+		goto err_free_input;
+	}
+
+	err = input_register_device(input_dev);
+	if (err) {
+		dev_err(&pdev->dev, "Unable to register input device, %d\n",
+			err);
+		goto err_free_irq;
+	}
+
+	platform_set_drvdata(pdev, onkey);
+
+	return 0;
+
+err_free_irq:
+	free_irq(irq, onkey);
+	cancel_delayed_work_sync(&onkey->work);
+err_free_input:
+	input_free_device(input_dev);
+
+	return err;
+}
+
+static int __devexit da9055_onkey_remove(struct platform_device *pdev)
+{
+	struct da9055_onkey *onkey = platform_get_drvdata(pdev);
+	int irq = platform_get_irq_byname(pdev, "ONKEY");
+
+	irq = regmap_irq_get_virq(onkey->da9055->irq_data, irq);
+	free_irq(irq, onkey);
+	cancel_delayed_work_sync(&onkey->work);
+	input_unregister_device(onkey->input);
+
+	return 0;
+}
+
+static struct platform_driver da9055_onkey_driver = {
+	.probe	= da9055_onkey_probe,
+	.remove	= __devexit_p(da9055_onkey_remove),
+	.driver = {
+		.name	= "da9055-onkey",
+		.owner	= THIS_MODULE,
+	},
+};
+
+module_platform_driver(da9055_onkey_driver);
+
+MODULE_AUTHOR("David Dajun Chen <dchen@diasemi.com>");
+MODULE_DESCRIPTION("Onkey driver for DA9055");
+MODULE_LICENSE("GPL");
+MODULE_ALIAS("platform:da9055-onkey");