[RFC PATCH v3 4/5] input: add onkey driver for Marvell 88PM886 PMIC

Karel Balej
2024-03-03T10:15:36Z

From: Karel Balej <balejk@matfyz.cz>

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.

Signed-off-by: Karel Balej <balejk@matfyz.cz>
---

Notes:
RFC v3:
- Drop wakeup-source.
RFC v2:
- Address Dmitry's feedback:
- Sort includes alphabetically.
- Drop onkey->irq.
- ret -> err in irq_handler and no initialization.
- Break long lines and other formatting.
- Do not clobber platform_get_irq error.
- Do not set device parent manually.
- Use input_set_capability.
- Use the wakeup-source DT property.
- Drop of_match_table.
- Use more temporaries.
- Use dev_err_probe.
- Modify Kconfig description.

drivers/input/misc/88pm886-onkey.c | 92 ++++++++++++++++++++++++++++++
drivers/input/misc/Kconfig | 7 +++
drivers/input/misc/Makefile | 1 +
3 files changed, 100 insertions(+)
create mode 100644 drivers/input/misc/88pm886-onkey.c

diff --git a/drivers/input/misc/88pm886-onkey.c b/drivers/input/misc/88pm886-onkey.c
new file mode 100644
index 000000000000..2e5df21cd11b
--- /dev/null
+++ b/drivers/input/misc/88pm886-onkey.c
@@ -0,0 +1,92 @@
+// SPDX-License-Identifier: GPL-2.0-only
+#include <linux/input.h>
+#include <linux/interrupt.h>
+#include <linux/irq.h>
+#include <linux/kernel.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->regmaps[PM886_REGMAP_BASE];
+ 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 struct platform_driver pm886_onkey_driver = {
+ .driver = {
+ .name = "88pm886-onkey",
+ },
+ .probe = pm886_onkey_probe,
+};
+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 6ba984d7f0b1..16a079d9f0f2 100644
--- 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 04296a4abe8e..054a6dc1ac27 100644
--- 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
--
2.44.0