[PATCH 12/13] input: max77650: add onkey support

[Bartosz Golaszewski <brgl@bgdev.pl>]

From: Bartosz Golaszewski <bgolaszewski@baylibre.com>

Add support for the push- and slide-button events for max77650.

Signed-off-by: Bartosz Golaszewski <bgolaszewski@baylibre.com>
---
 drivers/input/misc/Kconfig          |   9 ++
 drivers/input/misc/Makefile         |   1 +
 drivers/input/misc/max77650-onkey.c | 135 ++++++++++++++++++++++++++++
 3 files changed, 145 insertions(+)
 create mode 100644 drivers/input/misc/max77650-onkey.c

diff --git a/drivers/input/misc/Kconfig b/drivers/input/misc/Kconfig
index ca59a2be9bc5..bb9c45c1269e 100644
--- a/drivers/input/misc/Kconfig
+++ b/drivers/input/misc/Kconfig
@@ -180,6 +180,15 @@ config INPUT_M68K_BEEP
 	tristate "M68k Beeper support"
 	depends on M68K
 
+config INPUT_MAX77650_ONKEY
+	tristate "Maxim MAX77650 ONKEY support"
+	depends on MFD_MAX77650
+	help
+	  Support the ONKEY of the MAX77650 PMIC as an input device.
+
+	  To compile this driver as a module, choose M here: the module
+	  will be called max77650-onkey.
+
 config INPUT_MAX77693_HAPTIC
 	tristate "MAXIM MAX77693/MAX77843 haptic controller support"
 	depends on (MFD_MAX77693 || MFD_MAX77843) && PWM
diff --git a/drivers/input/misc/Makefile b/drivers/input/misc/Makefile
index 9d0f9d1ff68f..5bd53590ce60 100644
--- a/drivers/input/misc/Makefile
+++ b/drivers/input/misc/Makefile
@@ -43,6 +43,7 @@ obj-$(CONFIG_INPUT_IXP4XX_BEEPER)	+= ixp4xx-beeper.o
 obj-$(CONFIG_INPUT_KEYSPAN_REMOTE)	+= keyspan_remote.o
 obj-$(CONFIG_INPUT_KXTJ9)		+= kxtj9.o
 obj-$(CONFIG_INPUT_M68K_BEEP)		+= m68kspkr.o
+obj-$(CONFIG_INPUT_MAX77650_ONKEY)	+= max77650-onkey.o
 obj-$(CONFIG_INPUT_MAX77693_HAPTIC)	+= max77693-haptic.o
 obj-$(CONFIG_INPUT_MAX8925_ONKEY)	+= max8925_onkey.o
 obj-$(CONFIG_INPUT_MAX8997_HAPTIC)	+= max8997_haptic.o
diff --git a/drivers/input/misc/max77650-onkey.c b/drivers/input/misc/max77650-onkey.c
new file mode 100644
index 000000000000..cc7e83f589cd
--- /dev/null
+++ b/drivers/input/misc/max77650-onkey.c
@@ -0,0 +1,135 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * Copyright (C) 2018 BayLibre SAS
+ * Author: Bartosz Golaszewski <bgolaszewski@baylibre.com>
+ *
+ * ONKEY driver for MAXIM 77650/77651 charger/power-supply.
+ */
+
+#include <linux/i2c.h>
+#include <linux/input.h>
+#include <linux/interrupt.h>
+#include <linux/mfd/max77650.h>
+#include <linux/module.h>
+#include <linux/platform_device.h>
+#include <linux/regmap.h>
+
+#define MAX77650_ONKEY_MODE_MASK	BIT(3)
+#define MAX77650_ONKEY_MODE_PUSH	0x00
+#define MAX77650_ONKEY_MODE_SLIDE	BIT(3)
+
+struct max77650_onkey {
+	struct input_dev *input;
+	unsigned int code;
+};
+
+static irqreturn_t
+max77650_onkey_report(struct max77650_onkey *onkey, int value)
+{
+	input_report_key(onkey->input, onkey->code, value);
+	input_sync(onkey->input);
+
+	return IRQ_HANDLED;
+}
+
+static irqreturn_t max77650_onkey_falling(int irq, void *data)
+{
+	struct max77650_onkey *onkey = data;
+
+	return max77650_onkey_report(onkey, 0);
+}
+
+static irqreturn_t max77650_onkey_rising(int irq, void *data)
+{
+	struct max77650_onkey *onkey = data;
+
+	return max77650_onkey_report(onkey, 1);
+}
+
+static int max77650_onkey_probe(struct platform_device *pdev)
+{
+	struct regmap_irq_chip_data *irq_data;
+	struct max77650_onkey *onkey;
+	struct device *dev, *parent;
+	int irq_r, irq_f, rv, mode;
+	struct i2c_client *i2c;
+	const char *mode_prop;
+	struct regmap *map;
+
+	dev = &pdev->dev;
+	parent = dev->parent;
+	i2c = to_i2c_client(parent);
+	irq_data = i2c_get_clientdata(i2c);
+
+	map = dev_get_regmap(parent, NULL);
+	if (!map)
+		return -ENODEV;
+
+	onkey = devm_kzalloc(dev, sizeof(*onkey), GFP_KERNEL);
+	if (!onkey)
+		return -ENOMEM;
+
+	rv = device_property_read_u32(dev, "linux,code", &onkey->code);
+	if (rv)
+		onkey->code = KEY_POWER;
+
+	rv = device_property_read_string(dev, "maxim,onkey-mode", &mode_prop);
+	if (rv)
+		mode_prop = "push";
+
+	if (strcmp(mode_prop, "push") == 0)
+		mode = MAX77650_ONKEY_MODE_PUSH;
+	else if (strcmp(mode_prop, "slide") == 0)
+		mode = MAX77650_ONKEY_MODE_SLIDE;
+	else
+		return -EINVAL;
+
+	rv = regmap_update_bits(map, MAX77650_REG_CNFG_GLBL,
+				MAX77650_ONKEY_MODE_MASK, mode);
+	if (rv)
+		return rv;
+
+	irq_f = regmap_irq_get_virq(irq_data, MAX77650_INT_nEN_F);
+	if (irq_f <= 0)
+		return -EINVAL;
+
+	irq_r = regmap_irq_get_virq(irq_data, MAX77650_INT_nEN_R);
+	if (irq_r <= 0)
+		return -EINVAL;
+
+	onkey->input = devm_input_allocate_device(dev);
+	if (!onkey->input)
+		return -ENOMEM;
+
+	onkey->input->name = "max77650_onkey";
+	onkey->input->phys = "max77650_onkey/input0";
+	onkey->input->id.bustype = BUS_I2C;
+	onkey->input->dev.parent = dev;
+	input_set_capability(onkey->input, EV_KEY, onkey->code);
+
+	rv = devm_request_threaded_irq(dev, irq_f, NULL,
+				       max77650_onkey_falling,
+				       IRQF_ONESHOT, "onkey-down", onkey);
+	if (rv)
+		return rv;
+
+	rv = devm_request_threaded_irq(dev, irq_r, NULL,
+				       max77650_onkey_rising,
+				       IRQF_ONESHOT, "onkey-up", onkey);
+	if (rv)
+		return rv;
+
+	return input_register_device(onkey->input);
+}
+
+static struct platform_driver max77650_onkey_driver = {
+	.driver = {
+		.name = "max77650-onkey",
+	},
+	.probe = max77650_onkey_probe,
+};
+module_platform_driver(max77650_onkey_driver);
+
+MODULE_DESCRIPTION("MAXIM 77650/77651 ONKEY driver");
+MODULE_AUTHOR("Bartosz Golaszewski <bgolaszewski@baylibre.com>");
+MODULE_LICENSE("GPL");
-- 
2.19.1