Merge tag 'ib-mfd-input-v6.18' of git://git.kernel.org/pub/scm/linux/kernel/git/lee/mfd into next

Sync up with MFD tree to bring in support for tps6594.

drivers/input/misc/Kconfig

@@ -506,6 +506,16 @@ config INPUT_TPS65219_PWRBUTTON
 	  To compile this driver as a module, choose M here. The module will
 	  be called tps65219-pwrbutton.
 
+config INPUT_TPS6594_PWRBUTTON
+	tristate "TPS6594 Power button driver"
+	depends on MFD_TPS6594
+	help
+	  Say Y here if you want to enable power button reporting for
+	  TPS6594 Power Management IC devices.
+
+	  To compile this driver as a module, choose M here. The module will
+	  be called tps6594-pwrbutton.
+
 config INPUT_AXP20X_PEK
 	tristate "X-Powers AXP20X power button driver"
 	depends on MFD_AXP20X

drivers/input/misc/Makefile

@@ -83,6 +83,7 @@ obj-$(CONFIG_INPUT_SPARCSPKR)		+= sparcspkr.o
 obj-$(CONFIG_INPUT_STPMIC1_ONKEY)  	+= stpmic1_onkey.o
 obj-$(CONFIG_INPUT_TPS65218_PWRBUTTON)	+= tps65218-pwrbutton.o
 obj-$(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_TWL6040_VIBRA)	+= twl6040-vibra.o

drivers/input/misc/tps6594-pwrbutton.c

@@ -0,0 +1,126 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * power button driver for TI TPS6594 PMICs
+ *
+ * Copyright (C) 2025 Critical Link LLC - https://www.criticallink.com/
+ */
+#include <linux/init.h>
+#include <linux/input.h>
+#include <linux/interrupt.h>
+#include <linux/kernel.h>
+#include <linux/mfd/tps6594.h>
+#include <linux/module.h>
+#include <linux/platform_device.h>
+#include <linux/regmap.h>
+#include <linux/slab.h>
+
+struct tps6594_pwrbutton {
+	struct device *dev;
+	struct input_dev *idev;
+	char phys[32];
+};
+
+static irqreturn_t tps6594_pb_push_irq(int irq, void *_pwr)
+{
+	struct tps6594_pwrbutton *pwr = _pwr;
+
+	input_report_key(pwr->idev, KEY_POWER, 1);
+	pm_wakeup_event(pwr->dev, 0);
+	input_sync(pwr->idev);
+
+	return IRQ_HANDLED;
+}
+
+static irqreturn_t tps6594_pb_release_irq(int irq, void *_pwr)
+{
+	struct tps6594_pwrbutton *pwr = _pwr;
+
+	input_report_key(pwr->idev, KEY_POWER, 0);
+	input_sync(pwr->idev);
+
+	return IRQ_HANDLED;
+}
+
+static int tps6594_pb_probe(struct platform_device *pdev)
+{
+	struct device *dev = &pdev->dev;
+	struct tps6594_pwrbutton *pwr;
+	struct input_dev *idev;
+	int error;
+	int push_irq;
+	int release_irq;
+
+	pwr = devm_kzalloc(dev, sizeof(*pwr), GFP_KERNEL);
+	if (!pwr)
+		return -ENOMEM;
+
+	idev = devm_input_allocate_device(dev);
+	if (!idev)
+		return -ENOMEM;
+
+	idev->name = pdev->name;
+	snprintf(pwr->phys, sizeof(pwr->phys), "%s/input0",
+		 pdev->name);
+	idev->phys = pwr->phys;
+	idev->id.bustype = BUS_I2C;
+
+	input_set_capability(idev, EV_KEY, KEY_POWER);
+
+	pwr->dev = dev;
+	pwr->idev = idev;
+	device_init_wakeup(dev, true);
+
+	push_irq = platform_get_irq(pdev, 0);
+	if (push_irq < 0)
+		return -EINVAL;
+
+	release_irq = platform_get_irq(pdev, 1);
+	if (release_irq < 0)
+		return -EINVAL;
+
+	error = devm_request_threaded_irq(dev, push_irq, NULL,
+					  tps6594_pb_push_irq,
+					  IRQF_ONESHOT,
+					  pdev->resource[0].name, pwr);
+	if (error) {
+		dev_err(dev, "failed to request push IRQ #%d: %d\n", push_irq,
+			error);
+		return error;
+	}
+
+	error = devm_request_threaded_irq(dev, release_irq, NULL,
+					  tps6594_pb_release_irq,
+					  IRQF_ONESHOT,
+					  pdev->resource[1].name, pwr);
+	if (error) {
+		dev_err(dev, "failed to request release IRQ #%d: %d\n",
+			release_irq, error);
+		return error;
+	}
+
+	error = input_register_device(idev);
+	if (error) {
+		dev_err(dev, "Can't register power button: %d\n", error);
+		return error;
+	}
+
+	return 0;
+}
+
+static const struct platform_device_id tps6594_pwrbtn_id_table[] = {
+	{ "tps6594-pwrbutton", },
+	{ /* sentinel */ }
+};
+MODULE_DEVICE_TABLE(platform, tps6594_pwrbtn_id_table);
+
+static struct platform_driver tps6594_pb_driver = {
+	.probe = tps6594_pb_probe,
+	.driver = {
+		.name = "tps6594_pwrbutton",
+	},
+	.id_table = tps6594_pwrbtn_id_table,
+};
+module_platform_driver(tps6594_pb_driver);
+
+MODULE_DESCRIPTION("TPS6594 Power Button");
+MODULE_LICENSE("GPL");

drivers/mfd/tps6594-core.c

@@ -15,11 +15,14 @@
 #include <linux/interrupt.h>
 #include <linux/module.h>
 #include <linux/of.h>
+#include <linux/reboot.h>
 
 #include <linux/mfd/core.h>
 #include <linux/mfd/tps6594.h>
 
 #define TPS6594_CRC_SYNC_TIMEOUT_MS 150
+#define TPS65224_EN_SEL_PB 1
+#define TPS65224_GPIO3_SEL_PB 3
 
 /* Completion to synchronize CRC feature enabling on all PMICs */
 static DECLARE_COMPLETION(tps6594_crc_comp);
@@ -128,6 +131,12 @@ static const struct resource tps6594_rtc_resources[] = {
 	DEFINE_RES_IRQ_NAMED(TPS6594_IRQ_POWER_UP, TPS6594_IRQ_NAME_POWERUP),
 };
 
+static const struct resource tps6594_pwrbutton_resources[] = {
+	DEFINE_RES_IRQ_NAMED(TPS65224_IRQ_PB_FALL, TPS65224_IRQ_NAME_PB_FALL),
+	DEFINE_RES_IRQ_NAMED(TPS65224_IRQ_PB_RISE, TPS65224_IRQ_NAME_PB_RISE),
+	DEFINE_RES_IRQ_NAMED(TPS65224_IRQ_PB_SHORT, TPS65224_IRQ_NAME_PB_SHORT),
+};
+
 static const struct mfd_cell tps6594_common_cells[] = {
 	MFD_CELL_RES("tps6594-regulator", tps6594_regulator_resources),
 	MFD_CELL_RES("tps6594-pinctrl", tps6594_pinctrl_resources),
@@ -318,8 +327,6 @@ static const struct resource tps65224_pfsm_resources[] = {
 	DEFINE_RES_IRQ_NAMED(TPS65224_IRQ_REG_UNLOCK, TPS65224_IRQ_NAME_REG_UNLOCK),
 	DEFINE_RES_IRQ_NAMED(TPS65224_IRQ_TWARN, TPS65224_IRQ_NAME_TWARN),
 	DEFINE_RES_IRQ_NAMED(TPS65224_IRQ_PB_LONG, TPS65224_IRQ_NAME_PB_LONG),
-	DEFINE_RES_IRQ_NAMED(TPS65224_IRQ_PB_FALL, TPS65224_IRQ_NAME_PB_FALL),
-	DEFINE_RES_IRQ_NAMED(TPS65224_IRQ_PB_RISE, TPS65224_IRQ_NAME_PB_RISE),
 	DEFINE_RES_IRQ_NAMED(TPS65224_IRQ_TSD_ORD, TPS65224_IRQ_NAME_TSD_ORD),
 	DEFINE_RES_IRQ_NAMED(TPS65224_IRQ_BIST_FAIL, TPS65224_IRQ_NAME_BIST_FAIL),
 	DEFINE_RES_IRQ_NAMED(TPS65224_IRQ_REG_CRC_ERR, TPS65224_IRQ_NAME_REG_CRC_ERR),
@@ -347,6 +354,12 @@ static const struct mfd_cell tps65224_common_cells[] = {
 	MFD_CELL_RES("tps6594-regulator", tps65224_regulator_resources),
 };
 
+static const struct mfd_cell tps6594_pwrbutton_cell = {
+	.name = "tps6594-pwrbutton",
+	.resources = tps6594_pwrbutton_resources,
+	.num_resources = ARRAY_SIZE(tps6594_pwrbutton_resources),
+};
+
 static const struct regmap_irq tps65224_irqs[] = {
 	/* INT_BUCK register */
 	REGMAP_IRQ_REG(TPS65224_IRQ_BUCK1_UVOV, 0, TPS65224_BIT_BUCK1_UVOV_INT),
@@ -676,11 +689,25 @@ static int tps6594_enable_crc(struct tps6594 *tps)
 	return ret;
 }
 
+static int tps6594_power_off_handler(struct sys_off_data *data)
+{
+	struct tps6594 *tps = data->cb_data;
+	int ret;
+
+	ret = regmap_update_bits(tps->regmap, TPS6594_REG_FSM_I2C_TRIGGERS,
+				 TPS6594_BIT_TRIGGER_I2C(0), TPS6594_BIT_TRIGGER_I2C(0));
+	if (ret)
+		return notifier_from_errno(ret);
+
+	return NOTIFY_DONE;
+}
+
 int tps6594_device_init(struct tps6594 *tps, bool enable_crc)
 {
 	struct device *dev = tps->dev;
 	int ret;
 	struct regmap_irq_chip *irq_chip;
+	unsigned int pwr_on, gpio3_cfg;
 	const struct mfd_cell *cells;
 	int n_cells;
 
@@ -727,6 +754,27 @@ int tps6594_device_init(struct tps6594 *tps, bool enable_crc)
 	if (ret)
 		return dev_err_probe(dev, ret, "Failed to add common child devices\n");
 
+	/* If either the PB/EN/VSENSE or GPIO3 is configured as PB, register a driver for it */
+	if (tps->chip_id == TPS65224 || tps->chip_id == TPS652G1) {
+		ret = regmap_read(tps->regmap, TPS6594_REG_NPWRON_CONF, &pwr_on);
+		if (ret)
+			return dev_err_probe(dev, ret, "Failed to read PB/EN/VSENSE config\n");
+
+		ret = regmap_read(tps->regmap, TPS6594_REG_GPIOX_CONF(2), &gpio3_cfg);
+		if (ret)
+			return dev_err_probe(dev, ret, "Failed to read GPIO3 config\n");
+
+		if (FIELD_GET(TPS65224_MASK_EN_PB_VSENSE_CONFIG, pwr_on) == TPS65224_EN_SEL_PB ||
+		    FIELD_GET(TPS65224_MASK_GPIO_SEL, gpio3_cfg) == TPS65224_GPIO3_SEL_PB) {
+			ret = devm_mfd_add_devices(dev, PLATFORM_DEVID_AUTO,
+						   &tps6594_pwrbutton_cell, 1, NULL, 0,
+						   regmap_irq_get_domain(tps->irq_data));
+			if (ret)
+				return dev_err_probe(dev, ret,
+						     "Failed to add power button device.\n");
+		}
+	}
+
 	/* No RTC for LP8764, TPS65224 and TPS652G1 */
 	if (tps->chip_id != LP8764 && tps->chip_id != TPS65224 && tps->chip_id != TPS652G1) {
 		ret = devm_mfd_add_devices(dev, PLATFORM_DEVID_AUTO, tps6594_rtc_cells,
@@ -736,6 +784,12 @@ int tps6594_device_init(struct tps6594 *tps, bool enable_crc)
 			return dev_err_probe(dev, ret, "Failed to add RTC child device\n");
 	}
 
+	if (of_device_is_system_power_controller(dev->of_node)) {
+		ret = devm_register_power_off_handler(tps->dev, tps6594_power_off_handler, tps);
+		if (ret)
+			return dev_err_probe(dev, ret, "Failed to register power-off handler\n");
+	}
+
 	return 0;
 }
 EXPORT_SYMBOL_GPL(tps6594_device_init);