[PATCH 2/3] Input: add TWL603x power button

[akemnade@kernel.org]

From: Andreas Kemnade <andreas@kemnade.info>

Like the TWL4030, these PMICs also have a power button feature, so add
a driver for it.

Signed-off-by: Andreas Kemnade <andreas@kemnade.info>
---
 drivers/input/misc/Kconfig             |  10 +++
 drivers/input/misc/Makefile            |   1 +
 drivers/input/misc/twl6030-pwrbutton.c | 111 +++++++++++++++++++++++++++++++++
 3 files changed, 122 insertions(+)

diff --git a/drivers/input/misc/Kconfig b/drivers/input/misc/Kconfig
index cc2558630797e..5e2d1a5116502 100644
--- a/drivers/input/misc/Kconfig
+++ b/drivers/input/misc/Kconfig
@@ -569,6 +569,16 @@ config INPUT_TWL4030_VIBRA
 	  To compile this driver as a module, choose M here. The module will
 	  be called twl4030_vibra.
 
+config INPUT_TWL6030_PWRBUTTON
+	tristate "TWL6030 Power button Driver"
+	depends on TWL4030_CORE
+	help
+	  Say Y here if you want to enable power key reporting via the
+	  TWL6030 family of chips.
+
+	  To compile this driver as a module, choose M here. The module will
+	  be called twl4030_pwrbutton.
+
 config INPUT_TWL6040_VIBRA
 	tristate "Support for TWL6040 Vibrator"
 	depends on TWL6040_CORE
diff --git a/drivers/input/misc/Makefile b/drivers/input/misc/Makefile
index f5ebfa9d99831..596c013261f44 100644
--- a/drivers/input/misc/Makefile
+++ b/drivers/input/misc/Makefile
@@ -88,6 +88,7 @@ obj-$(CONFIG_INPUT_TPS65219_PWRBUTTON)	+= tps65219-pwrbutton.o
 obj-$(CONFIG_INPUT_TPS6594_PWRBUTTON)	+= tps6594-pwrbutton.o
 obj-$(CONFIG_INPUT_TWL4030_PWRBUTTON)	+= twl4030-pwrbutton.o
 obj-$(CONFIG_INPUT_TWL4030_VIBRA)	+= twl4030-vibra.o
+obj-$(CONFIG_INPUT_TWL6030_PWRBUTTON)	+= twl6030-pwrbutton.o
 obj-$(CONFIG_INPUT_TWL6040_VIBRA)	+= twl6040-vibra.o
 obj-$(CONFIG_INPUT_UINPUT)		+= uinput.o
 obj-$(CONFIG_INPUT_WISTRON_BTNS)	+= wistron_btns.o
diff --git a/drivers/input/misc/twl6030-pwrbutton.c b/drivers/input/misc/twl6030-pwrbutton.c
new file mode 100644
index 0000000000000..fb3d8dcc9088a
--- /dev/null
+++ b/drivers/input/misc/twl6030-pwrbutton.c
@@ -0,0 +1,111 @@
+// SPDX-License-Identifier: GPL-2.0-only
+/**
+ * TWL603x power button input driver
+ *
+ * Copyright (C) 2024 Andreas Kemnade <andreas@kemnade.info>
+ *
+ * based on older 6030 driver found in a v3.0 vendor kernel
+ */
+
+#include <linux/module.h>
+#include <linux/init.h>
+#include <linux/kernel.h>
+#include <linux/errno.h>
+#include <linux/input.h>
+#include <linux/bits.h>
+#include <linux/interrupt.h>
+#include <linux/of.h>
+#include <linux/platform_device.h>
+#include <linux/mfd/twl.h>
+
+#define PWR_PWRON_IRQ BIT(0)
+
+#define STS_HW_CONDITIONS 0x2
+
+static irqreturn_t powerbutton_irq(int irq, void *_pwr)
+{
+	struct input_dev *pwr = _pwr;
+	int err;
+	u8 value;
+
+	err = twl_i2c_read_u8(TWL_MODULE_PM_MASTER, &value, STS_HW_CONDITIONS);
+	if (err)
+		return IRQ_HANDLED;
+
+	pm_wakeup_event(pwr->dev.parent, 0);
+	input_report_key(pwr, KEY_POWER, value & PWR_PWRON_IRQ);
+	input_sync(pwr);
+
+	return IRQ_HANDLED;
+}
+
+static int twl6030_pwrbutton_probe(struct platform_device *pdev)
+{
+	struct input_dev *pwr;
+	int irq = platform_get_irq(pdev, 0);
+	int err;
+
+	pwr = devm_input_allocate_device(&pdev->dev);
+	if (!pwr) {
+		dev_err(&pdev->dev, "Can't allocate power button\n");
+		return -ENOMEM;
+	}
+
+	input_set_capability(pwr, EV_KEY, KEY_POWER);
+	pwr->name = "twl6030_pwrbutton";
+	pwr->phys = "twl6030_pwrbutton/input0";
+	pwr->dev.parent = &pdev->dev;
+
+	err = devm_request_threaded_irq(&pdev->dev, irq, NULL, powerbutton_irq,
+			IRQF_TRIGGER_FALLING | IRQF_TRIGGER_RISING |
+			IRQF_ONESHOT,
+			"twl6030_pwrbutton", pwr);
+	if (err < 0) {
+		dev_err(&pdev->dev, "Can't get IRQ for pwrbutton: %d\n", err);
+		return err;
+	}
+
+	err = input_register_device(pwr);
+	if (err) {
+		dev_err(&pdev->dev, "Can't register power button: %d\n", err);
+		return err;
+	}
+
+	err = twl6030_interrupt_unmask(0x01, REG_INT_MSK_LINE_A);
+	if (err < 0)
+		return err;
+
+	err = twl6030_interrupt_unmask(0x01, REG_INT_MSK_STS_A);
+	if (err < 0)
+		return err;
+
+	device_init_wakeup(&pdev->dev, true);
+
+	return 0;
+}
+
+static void twl6030_pwrbutton_remove(struct platform_device *pdev)
+{
+	twl6030_interrupt_mask(0x01, REG_INT_MSK_LINE_A);
+	twl6030_interrupt_mask(0x01, REG_INT_MSK_STS_A);
+}
+
+static const struct of_device_id twl6030_pwrbutton_dt_match_table[] = {
+	{ .compatible = "ti,twl6030-pwrbutton" },
+	{},
+};
+MODULE_DEVICE_TABLE(of, twl6030_pwrbutton_dt_match_table);
+
+static struct platform_driver twl6030_pwrbutton_driver = {
+	.probe		= twl6030_pwrbutton_probe,
+	.remove		= twl6030_pwrbutton_remove,
+	.driver		= {
+		.name	= "twl6030_pwrbutton",
+		.of_match_table = of_match_ptr(twl6030_pwrbutton_dt_match_table),
+	},
+};
+module_platform_driver(twl6030_pwrbutton_driver);
+
+MODULE_ALIAS("platform:twl6030_pwrbutton");
+MODULE_DESCRIPTION("Phoenix Power Button");
+MODULE_LICENSE("GPL");

-- 
2.47.3