Message-ID: <00c84979e48d7310bd3907216c01debbb80d8392.1431437466.git.stwiss.opensource@diasemi.com>
Date:	Tue, 12 May 2015 14:31:06 +0100
From:	S Twiss <stwiss.opensource@...semi.com>
To:	Dmitry Torokhov <dmitry.torokhov@...il.com>
CC:	DT <devicetree@...r.kernel.org>,
	David Dajun Chen <david.chen@...semi.com>,
	INPUT <linux-input@...r.kernel.org>,
	Ian Campbell <ijc+devicetree@...lion.org.uk>,
	Kumar Gala <galak@...eaurora.org>,
	LKML <linux-kernel@...r.kernel.org>,
	Lee Jones <lee.jones@...aro.org>,
	Mark Rutland <mark.rutland@....com>,
	Pawel Moll <pawel.moll@....com>,
	Rob Herring <robh+dt@...nel.org>,
	Samuel Ortiz <sameo@...ux.intel.com>,
	Steve Twiss <stwiss.opensource@...semi.com>,
	Support Opensource <support.opensource@...semi.com>
Subject: [PATCH V4 1/3] input: misc: da9063: OnKey driver

From: Steve Twiss <stwiss.opensource@...semi.com>

Add OnKey driver support for DA9063


Signed-off-by: Steve Twiss <stwiss.opensource@...semi.com>

---
The changes made here have been taken from the DA9062 OnKey review thread. 
Please see https://lkml.org/lkml/2015/4/29/406 for more information on this.

Version History

Changes in V4
 - No change

Changes in V3
 - Move the MFD code changes into a separate patch [PATCH V3 3/3]
 - Rename OnKey driver to use underscore: da9063_onkey.c
 - Header and MODULE_LICENSE macro update for GPL and filename change
 - Remove MAINTAINERS file (no longer needed due to rename of onkey driver)
 - Delete input_unregister_device call from platform driver remove function
 - Replaced dev_notice() with dev_dbg() for key press notification

Changes in V2
 - Remove the circular dependency comment in the main e-mail body
   linking PATCH V1 1/2 and 2/2
 - Alter the copyright header information to match expected GPLv2
   text from http://www.gnu.org/licenses/gpl-2.0.html

This patch applies against linux-next and v4.1-rc3 


 drivers/input/misc/Kconfig        |  10 ++
 drivers/input/misc/Makefile       |   1 +
 drivers/input/misc/da9063_onkey.c | 227 ++++++++++++++++++++++++++++++++++++++
 3 files changed, 238 insertions(+)
 create mode 100644 drivers/input/misc/da9063_onkey.c

diff --git a/drivers/input/misc/Kconfig b/drivers/input/misc/Kconfig
index 4436ab1..d917883 100644
--- a/drivers/input/misc/Kconfig
+++ b/drivers/input/misc/Kconfig
@@ -610,6 +610,16 @@ config INPUT_DA9055_ONKEY
 	  To compile this driver as a module, choose M here: the module
 	  will be called da9055_onkey.
 
+config INPUT_DA9063_ONKEY
+	tristate "Dialog DA9063 OnKey"
+	depends on MFD_DA9063
+	help
+	  Support the ONKEY of Dialog DA9063 Power Management IC as an
+	  input device reporting power button statue.
+
+	  To compile this driver as a module, choose M here: the module
+	  will be called da9063-onkey.
+
 config INPUT_DM355EVM
 	tristate "TI DaVinci DM355 EVM Keypad and IR Remote"
 	depends on MFD_DM355EVM_MSP
diff --git a/drivers/input/misc/Makefile b/drivers/input/misc/Makefile
index 78ba4c1..4f95c56 100644
--- a/drivers/input/misc/Makefile
+++ b/drivers/input/misc/Makefile
@@ -25,6 +25,7 @@ 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-$(CONFIG_INPUT_DA9063_ONKEY)	+= da9063_onkey.o
 obj-$(CONFIG_INPUT_DM355EVM)		+= dm355evm_keys.o
 obj-$(CONFIG_INPUT_E3X0_BUTTON)		+= e3x0-button.o
 obj-$(CONFIG_INPUT_DRV260X_HAPTICS)	+= drv260x.o
diff --git a/drivers/input/misc/da9063_onkey.c b/drivers/input/misc/da9063_onkey.c
new file mode 100644
index 0000000..250595c
--- /dev/null
+++ b/drivers/input/misc/da9063_onkey.c
@@ -0,0 +1,227 @@
+/*
+ * da9063_onkey.c - Onkey device driver for DA9063
+ * Copyright (C) 2015  Dialog Semiconductor Ltd.
+ *
+ * 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.
+ *
+ * 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/module.h>
+#include <linux/errno.h>
+#include <linux/input.h>
+#include <linux/interrupt.h>
+#include <linux/platform_device.h>
+#include <linux/workqueue.h>
+#include <linux/regmap.h>
+#include <linux/of.h>
+#include <linux/mfd/da9063/core.h>
+#include <linux/mfd/da9063/pdata.h>
+#include <linux/mfd/da9063/registers.h>
+
+struct da9063_onkey {
+	struct	da9063 *hw;
+	struct delayed_work work;
+	struct	input_dev *input;
+	int irq;
+	bool key_power;
+};
+
+static void da9063_poll_on(struct work_struct *work)
+{
+	struct da9063_onkey *onkey = container_of(work, struct da9063_onkey,
+						  work.work);
+	unsigned int val;
+	int fault_log = 0;
+	bool poll = true;
+	int ret;
+
+	/* poll to see when the pin is released */
+	ret = regmap_read(onkey->hw->regmap, DA9063_REG_STATUS_A, &val);
+	if (ret < 0) {
+		dev_err(&onkey->input->dev,
+			"Failed to read ON status: %d\n", ret);
+		goto err_poll;
+	}
+
+	if (!(val & DA9063_NONKEY)) {
+		ret = regmap_update_bits(onkey->hw->regmap,
+					 DA9063_REG_CONTROL_B,
+					 DA9063_NONKEY_LOCK, 0);
+		if (ret < 0) {
+			dev_err(&onkey->input->dev,
+				"Failed to reset the Key Delay %d\n", ret);
+			goto err_poll;
+		}
+
+		input_report_key(onkey->input, KEY_POWER, 0);
+		input_sync(onkey->input);
+
+		poll = false;
+	}
+
+	/* if the fault log KEY_RESET is detected,
+	 * then clear it and shutdown via I2C
+	 */
+	ret = regmap_read(onkey->hw->regmap, DA9063_REG_FAULT_LOG, &fault_log);
+	if (ret < 0)
+		dev_warn(&onkey->input->dev, "Cannot read FAULT_LOG\n");
+
+	if (fault_log & DA9063_KEY_RESET) {
+		ret = regmap_write(onkey->hw->regmap,
+				   DA9063_REG_FAULT_LOG,
+				   DA9063_KEY_RESET);
+		if (ret < 0)
+			dev_warn(&onkey->input->dev,
+				 "Cannot reset KEY_RESET fault log\n");
+		else {
+			/* at this point we do any S/W housekeeping
+			 * and then send shutdown command
+			 */
+			dev_dbg(&onkey->input->dev,
+				 "Sending SHUTDOWN to DA9063 ...\n");
+			ret = regmap_write(onkey->hw->regmap,
+					   DA9063_REG_CONTROL_F,
+					   DA9063_SHUTDOWN);
+			if (ret < 0)
+				dev_err(&onkey->input->dev,
+					"Cannot SHUTDOWN DA9063\n");
+		}
+	}
+
+err_poll:
+	if (poll)
+		schedule_delayed_work(&onkey->work, 50);
+}
+
+static irqreturn_t da9063_onkey_irq_handler(int irq, void *data)
+{
+	struct da9063_onkey *onkey = data;
+	unsigned int val;
+	int ret;
+
+	ret = regmap_read(onkey->hw->regmap, DA9063_REG_STATUS_A, &val);
+	if (onkey->key_power && (ret >= 0) && (val & DA9063_NONKEY)) {
+		input_report_key(onkey->input, KEY_POWER, 1);
+		input_sync(onkey->input);
+		schedule_delayed_work(&onkey->work, 0);
+		dev_dbg(&onkey->input->dev, "KEY_POWER pressed.\n");
+	} else {
+		input_report_key(onkey->input, KEY_SLEEP, 1);
+		input_sync(onkey->input);
+		input_report_key(onkey->input, KEY_SLEEP, 0);
+		input_sync(onkey->input);
+		dev_dbg(&onkey->input->dev, "KEY_SLEEP pressed.\n");
+	}
+
+	return IRQ_HANDLED;
+}
+
+static int da9063_onkey_probe(struct platform_device *pdev)
+{
+	struct da9063 *da9063 = dev_get_drvdata(pdev->dev.parent);
+	struct da9063_pdata *pdata = dev_get_platdata(da9063->dev);
+	struct da9063_onkey *onkey;
+	bool kp_tmp = true;
+	int ret = 0;
+
+	if (pdata)
+		kp_tmp = pdata->key_power;
+	else {
+		kp_tmp = of_property_read_bool((&pdev->dev)->of_node,
+					       "dlg,disable-key-power");
+		kp_tmp = !kp_tmp;
+	}
+
+	onkey = devm_kzalloc(&pdev->dev, sizeof(struct da9063_onkey),
+			     GFP_KERNEL);
+	if (!onkey) {
+		dev_err(&pdev->dev, "Failed to allocate memory.\n");
+		ret = -ENOMEM;
+		goto err;
+	}
+
+	INIT_DELAYED_WORK(&onkey->work, da9063_poll_on);
+
+	onkey->input = devm_input_allocate_device(&pdev->dev);
+	if (!onkey->input) {
+		dev_err(&pdev->dev, "Failed to allocated input device.\n");
+		ret = -ENOMEM;
+		goto err;
+	}
+
+	ret = platform_get_irq_byname(pdev, "ONKEY");
+	if (ret < 0) {
+		dev_err(&pdev->dev, "Failed to get platform IRQ.\n");
+		goto err;
+	}
+	onkey->irq = ret;
+
+	ret = request_threaded_irq(onkey->irq, NULL,
+				   da9063_onkey_irq_handler,
+				   IRQF_TRIGGER_LOW | IRQF_ONESHOT,
+				   "ONKEY", onkey);
+	if (ret) {
+		dev_err(&pdev->dev,
+			"Failed to request input device IRQ.\n");
+		goto err;
+	}
+
+	onkey->hw = da9063;
+	onkey->key_power = kp_tmp;
+	onkey->input->evbit[0] = BIT_MASK(EV_KEY);
+	onkey->input->name = DA9063_DRVNAME_ONKEY;
+	onkey->input->phys = DA9063_DRVNAME_ONKEY "/input0";
+	onkey->input->dev.parent = &pdev->dev;
+
+	if (onkey->key_power)
+		input_set_capability(onkey->input, EV_KEY, KEY_POWER);
+	input_set_capability(onkey->input, EV_KEY, KEY_SLEEP);
+
+	ret = input_register_device(onkey->input);
+	if (ret) {
+		dev_err(&pdev->dev,
+			"Failed to register input device.\n");
+		goto err_irq;
+	}
+
+	platform_set_drvdata(pdev, onkey);
+	return 0;
+
+err_irq:
+	free_irq(onkey->irq, onkey);
+	cancel_delayed_work_sync(&onkey->work);
+err:
+	return ret;
+}
+
+static int da9063_onkey_remove(struct platform_device *pdev)
+{
+	struct	da9063_onkey *onkey = platform_get_drvdata(pdev);
+
+	free_irq(onkey->irq, onkey);
+	cancel_delayed_work_sync(&onkey->work);
+	return 0;
+}
+
+static struct platform_driver da9063_onkey_driver = {
+	.probe	= da9063_onkey_probe,
+	.remove	= da9063_onkey_remove,
+	.driver	= {
+		.name	= DA9063_DRVNAME_ONKEY,
+		.owner	= THIS_MODULE,
+	},
+};
+
+module_platform_driver(da9063_onkey_driver);
+
+MODULE_AUTHOR("S Twiss <stwiss.opensource@...semi.com>");
+MODULE_DESCRIPTION("Onkey device driver for Dialog DA9063");
+MODULE_LICENSE("GPL");
+MODULE_ALIAS("platform:" DA9063_DRVNAME_ONKEY);
-- 
end-of-patch for PATCH V4

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