[PATCH v5 2/5] mfd: rn5t618: add IRQ support

[Andreas Kemnade]

This adds support for IRQ handling in the RC5T619 which is required
for properly implementing subdevices like RTC.
For now only definitions for the variant RC5T619 are included.

Signed-off-by: Andreas Kemnade <andreas@xxxxxxxxxxxx>
---
Changes in v5:
rn5t618_irq_init static

Changes in v4:
merge rn5t618-irq.c into rn5t618.c
use macros for IRQ table

Changes in v3:
alignment cleanup

Changes in v2:
- no dead code, did some more testing and thinking for that
- remove extra empty lines
 drivers/mfd/Kconfig         |  1 +
 drivers/mfd/rn5t618.c       | 88 +++++++++++++++++++++++++++++++++++++++++++++
 include/linux/mfd/rn5t618.h | 15 ++++++++
 3 files changed, 104 insertions(+)

diff --git a/drivers/mfd/Kconfig b/drivers/mfd/Kconfig
index ae24d3ea68ea..522e068d0082 100644
--- a/drivers/mfd/Kconfig
+++ b/drivers/mfd/Kconfig
@@ -1057,6 +1057,7 @@ config MFD_RN5T618
 	depends on OF
 	select MFD_CORE
 	select REGMAP_I2C
+	select REGMAP_IRQ
 	help
 	  Say yes here to add support for the Ricoh RN5T567,
 	  RN5T618, RC5T619 PMIC.
diff --git a/drivers/mfd/rn5t618.c b/drivers/mfd/rn5t618.c
index da5cd9c92a59..fbd31397b047 100644
--- a/drivers/mfd/rn5t618.c
+++ b/drivers/mfd/rn5t618.c
@@ -8,6 +8,8 @@
 
 #include <linux/delay.h>
 #include <linux/i2c.h>
+#include <linux/interrupt.h>
+#include <linux/irq.h>
 #include <linux/mfd/core.h>
 #include <linux/mfd/rn5t618.h>
 #include <linux/module.h>
@@ -45,9 +47,63 @@ static const struct regmap_config rn5t618_regmap_config = {
 	.cache_type	= REGCACHE_RBTREE,
 };
 
+static const struct regmap_irq rc5t619_irqs[] = {
+	REGMAP_IRQ_REG(RN5T618_IRQ_SYS, 0, BIT(0)),
+	REGMAP_IRQ_REG(RN5T618_IRQ_DCDC, 0, BIT(1)),
+	REGMAP_IRQ_REG(RN5T618_IRQ_RTC, 0, BIT(2)),
+	REGMAP_IRQ_REG(RN5T618_IRQ_ADC, 0, BIT(3)),
+	REGMAP_IRQ_REG(RN5T618_IRQ_GPIO, 0, BIT(4)),
+	REGMAP_IRQ_REG(RN5T618_IRQ_CHG, 0, BIT(6)),
+};
+
+static const struct regmap_irq_chip rc5t619_irq_chip = {
+	.name = "rc5t619",
+	.irqs = rc5t619_irqs,
+	.num_irqs = ARRAY_SIZE(rc5t619_irqs),
+	.num_regs = 1,
+	.status_base = RN5T618_INTMON,
+	.mask_base = RN5T618_INTEN,
+	.mask_invert = true,
+};
+
 static struct rn5t618 *rn5t618_pm_power_off;
 static struct notifier_block rn5t618_restart_handler;
 
+static int rn5t618_irq_init(struct rn5t618 *rn5t618)
+{
+	const struct regmap_irq_chip *irq_chip;
+	int ret;
+
+	if (!rn5t618->irq)
+		return 0;
+
+	switch (rn5t618->variant) {
+	case RC5T619:
+		irq_chip = &rc5t619_irq_chip;
+		break;
+	default:
+		irq_chip = NULL;
+		break;
+	}
+
+	if (!irq_chip) {
+		dev_err(rn5t618->dev, "Currently no IRQ support for variant %d\n",
+			(int)rn5t618->variant);
+		return -ENOENT;
+	}
+
+	ret = devm_regmap_add_irq_chip(rn5t618->dev, rn5t618->regmap,
+				       rn5t618->irq,
+				       IRQF_TRIGGER_FALLING | IRQF_ONESHOT,
+				       0, irq_chip, &rn5t618->irq_data);
+	if (ret) {
+		dev_err(rn5t618->dev, "Failed to register IRQ chip\n");
+		return ret;
+	}
+
+	return 0;
+}
+
 static void rn5t618_trigger_poweroff_sequence(bool repower)
 {
 	/* disable automatic repower-on */
@@ -105,6 +161,8 @@ static int rn5t618_i2c_probe(struct i2c_client *i2c,
 
 	i2c_set_clientdata(i2c, priv);
 	priv->variant = (long)of_id->data;
+	priv->irq = i2c->irq;
+	priv->dev = &i2c->dev;
 
 	priv->regmap = devm_regmap_init_i2c(i2c, &rn5t618_regmap_config);
 	if (IS_ERR(priv->regmap)) {
@@ -137,6 +195,11 @@ static int rn5t618_i2c_probe(struct i2c_client *i2c,
 		return ret;
 	}
 
+	if (priv->irq > 0) {
+		if (rn5t618_irq_init(priv))
+			priv->irq = 0;
+	}
+
 	return 0;
 }
 
@@ -154,15 +217,40 @@ static int rn5t618_i2c_remove(struct i2c_client *i2c)
 	return 0;
 }
 
+static int __maybe_unused rn5t618_i2c_suspend(struct device *dev)
+{
+	struct rn5t618 *priv = dev_get_drvdata(dev);
+
+	if (priv->irq)
+		disable_irq(priv->irq);
+
+	return 0;
+}
+
+static int __maybe_unused rn5t618_i2c_resume(struct device *dev)
+{
+	struct rn5t618 *priv = dev_get_drvdata(dev);
+
+	if (priv->irq)
+		enable_irq(priv->irq);
+
+	return 0;
+}
+
 static const struct i2c_device_id rn5t618_i2c_id[] = {
 	{ }
 };
 MODULE_DEVICE_TABLE(i2c, rn5t618_i2c_id);
 
+static SIMPLE_DEV_PM_OPS(rn5t618_i2c_dev_pm_ops,
+			rn5t618_i2c_suspend,
+			rn5t618_i2c_resume);
+
 static struct i2c_driver rn5t618_i2c_driver = {
 	.driver = {
 		.name = "rn5t618",
 		.of_match_table = of_match_ptr(rn5t618_of_match),
+		.pm = &rn5t618_i2c_dev_pm_ops,
 	},
 	.probe = rn5t618_i2c_probe,
 	.remove = rn5t618_i2c_remove,
diff --git a/include/linux/mfd/rn5t618.h b/include/linux/mfd/rn5t618.h
index d62ef48060b5..739571656f2b 100644
--- a/include/linux/mfd/rn5t618.h
+++ b/include/linux/mfd/rn5t618.h
@@ -242,9 +242,24 @@ enum {
 	RC5T619,
 };
 
+/* RN5T618 IRQ definitions */
+enum {
+	RN5T618_IRQ_SYS = 0,
+	RN5T618_IRQ_DCDC,
+	RN5T618_IRQ_RTC,
+	RN5T618_IRQ_ADC,
+	RN5T618_IRQ_GPIO,
+	RN5T618_IRQ_CHG,
+	RN5T618_NR_IRQS,
+};
+
 struct rn5t618 {
 	struct regmap *regmap;
+	struct device *dev;
 	long variant;
+
+	int irq;
+	struct regmap_irq_chip_data *irq_data;
 };
 
 #endif /* __LINUX_MFD_RN5T618_H */
-- 
2.11.0