input: add onkey driver for Marvell 88PM886 PMIC

Marvell 88PM886 PMIC provides onkey among other things. Add client
driver to handle it. The driver currently only provides a basic support
omitting additional functions found in the vendor version, such as long
onkey and GPIO integration.

Acked-by: Dmitry Torokhov <dmitry.torokhov@gmail.com>
Signed-off-by: Karel Balej <balejk@matfyz.cz>

diff --git a/drivers/input/misc/88pm886-onkey.c b/drivers/input/misc/88pm886-onkey.c
new file mode 100644 (file)
index 0000000..284ff51
--- /dev/null
+++ b/drivers/input/misc/88pm886-onkey.c
@@ -0,0 +1,98 @@
+// SPDX-License-Identifier: GPL-2.0-only
+#include <linux/input.h>
+#include <linux/interrupt.h>
+#include <linux/irq.h>
+#include <linux/platform_device.h>
+#include <linux/regmap.h>
+
+#include <linux/mfd/88pm886.h>
+
+struct pm886_onkey {
+       struct input_dev *idev;
+       struct pm886_chip *chip;
+};
+
+static irqreturn_t pm886_onkey_irq_handler(int irq, void *data)
+{
+       struct pm886_onkey *onkey = data;
+       struct regmap *regmap = onkey->chip->regmap;
+       struct input_dev *idev = onkey->idev;
+       struct device *parent = idev->dev.parent;
+       unsigned int val;
+       int err;
+
+       err = regmap_read(regmap, PM886_REG_STATUS1, &val);
+       if (err) {
+               dev_err(parent, "Failed to read status: %d\n", err);
+               return IRQ_NONE;
+       }
+       val &= PM886_ONKEY_STS1;
+
+       input_report_key(idev, KEY_POWER, val);
+       input_sync(idev);
+
+       return IRQ_HANDLED;
+}
+
+static int pm886_onkey_probe(struct platform_device *pdev)
+{
+       struct pm886_chip *chip = dev_get_drvdata(pdev->dev.parent);
+       struct device *dev = &pdev->dev;
+       struct pm886_onkey *onkey;
+       struct input_dev *idev;
+       int irq, err;
+
+       onkey = devm_kzalloc(dev, sizeof(*onkey), GFP_KERNEL);
+       if (!onkey)
+               return -ENOMEM;
+
+       onkey->chip = chip;
+
+       irq = platform_get_irq(pdev, 0);
+       if (irq < 0)
+               return dev_err_probe(dev, irq, "Failed to get IRQ\n");
+
+       idev = devm_input_allocate_device(dev);
+       if (!idev) {
+               dev_err(dev, "Failed to allocate input device\n");
+               return -ENOMEM;
+       }
+       onkey->idev = idev;
+
+       idev->name = "88pm886-onkey";
+       idev->phys = "88pm886-onkey/input0";
+       idev->id.bustype = BUS_I2C;
+
+       input_set_capability(idev, EV_KEY, KEY_POWER);
+
+       err = devm_request_threaded_irq(dev, irq, NULL, pm886_onkey_irq_handler,
+                                       IRQF_ONESHOT | IRQF_NO_SUSPEND, "onkey",
+                                       onkey);
+       if (err)
+               return dev_err_probe(dev, err, "Failed to request IRQ\n");
+
+       err = input_register_device(idev);
+       if (err)
+               return dev_err_probe(dev, err, "Failed to register input device\n");
+
+       return 0;
+}
+
+static const struct platform_device_id pm886_onkey_id_table[] = {
+       { "88pm886-onkey", },
+       { }
+};
+MODULE_DEVICE_TABLE(platform, pm886_onkey_id_table);
+
+static struct platform_driver pm886_onkey_driver = {
+       .driver = {
+               .name = "88pm886-onkey",
+       },
+       .probe = pm886_onkey_probe,
+       .id_table = pm886_onkey_id_table,
+};
+module_platform_driver(pm886_onkey_driver);
+
+MODULE_DESCRIPTION("Marvell 88PM886 onkey driver");
+MODULE_AUTHOR("Karel Balej <balejk@matfyz.cz>");
+MODULE_LICENSE("GPL");

diff --git a/drivers/input/misc/Kconfig b/drivers/input/misc/Kconfig
index 6ba984d7f0b18694f48160c4628575af1c8ea252..16a079d9f0f25eb5fef12e05795fb38687afcd27 100644 (file)
--- a/drivers/input/misc/Kconfig
+++ b/drivers/input/misc/Kconfig
@@ -33,6 +33,13 @@ config INPUT_88PM80X_ONKEY
          To compile this driver as a module, choose M here: the module
          will be called 88pm80x_onkey.
 
+config INPUT_88PM886_ONKEY
+       tristate "Marvell 88PM886 onkey support"
+       depends on MFD_88PM886_PMIC
+       help
+         Support the onkey of Marvell 88PM886 PMIC as an input device
+         reporting power button status.
+
 config INPUT_AB8500_PONKEY
        tristate "AB8500 Pon (PowerOn) Key"
        depends on AB8500_CORE

diff --git a/drivers/input/misc/Makefile b/drivers/input/misc/Makefile
index 04296a4abe8e87ac41873d4451abc8e3c00d02a5..054a6dc1ac27b282daad526ffae24ffb4017811c 100644 (file)
--- a/drivers/input/misc/Makefile
+++ b/drivers/input/misc/Makefile
@@ -7,6 +7,7 @@
 
 obj-$(CONFIG_INPUT_88PM860X_ONKEY)     += 88pm860x_onkey.o
 obj-$(CONFIG_INPUT_88PM80X_ONKEY)      += 88pm80x_onkey.o
+obj-$(CONFIG_INPUT_88PM886_ONKEY)      += 88pm886-onkey.o
 obj-$(CONFIG_INPUT_AB8500_PONKEY)      += ab8500-ponkey.o
 obj-$(CONFIG_INPUT_AD714X)             += ad714x.o
 obj-$(CONFIG_INPUT_AD714X_I2C)         += ad714x-i2c.o