[Letux-kernel] [PATCH 2/5] mfd: rn5t618: add irq support

Andreas Kemnade andreas at kemnade.info
Mon Oct 21 07:41:01 CEST 2019


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 at kemnade.info>
---
 drivers/mfd/Kconfig         |  1 +
 drivers/mfd/Makefile        |  2 +-
 drivers/mfd/rn5t618-core.c  | 35 ++++++++++++++++-
 drivers/mfd/rn5t618-irq.c   | 92 +++++++++++++++++++++++++++++++++++++++++++++
 include/linux/mfd/rn5t618.h | 18 +++++++++
 5 files changed, 146 insertions(+), 2 deletions(-)
 create mode 100644 drivers/mfd/rn5t618-irq.c

diff --git a/drivers/mfd/Kconfig b/drivers/mfd/Kconfig
index f129f9678940..7534f9c8478a 100644
--- a/drivers/mfd/Kconfig
+++ b/drivers/mfd/Kconfig
@@ -1063,6 +1063,7 @@ 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/Makefile b/drivers/mfd/Makefile
index 7d7e0ec4e325..27a67fc7cac1 100644
--- a/drivers/mfd/Makefile
+++ b/drivers/mfd/Makefile
@@ -220,7 +220,7 @@ obj-$(CONFIG_MFD_VIPERBOARD)    += viperboard.o
 obj-$(CONFIG_MFD_RC5T583)	+= rc5t583.o rc5t583-irq.o
 obj-$(CONFIG_MFD_RK808)		+= rk808.o
 
-rn5t618-objs			:= rn5t618-core.o
+rn5t618-objs			:= rn5t618-core.o rn5t618-irq.o
 obj-$(CONFIG_MFD_RN5T618)	+= rn5t618.o
 obj-$(CONFIG_MFD_SEC_CORE)	+= sec-core.o sec-irq.o
 obj-$(CONFIG_MFD_SYSCON)	+= syscon.o
diff --git a/drivers/mfd/rn5t618-core.c b/drivers/mfd/rn5t618-core.c
index da5cd9c92a59..d4ed2865ed8b 100644
--- a/drivers/mfd/rn5t618-core.c
+++ b/drivers/mfd/rn5t618-core.c
@@ -8,6 +8,7 @@
 
 #include <linux/delay.h>
 #include <linux/i2c.h>
+#include <linux/interrupt.h>
 #include <linux/mfd/core.h>
 #include <linux/mfd/rn5t618.h>
 #include <linux/module.h>
@@ -105,7 +106,8 @@ static int rn5t618_i2c_probe(struct i2c_client *i2c,
 
 	i2c_set_clientdata(i2c, priv);
 	priv->variant = (long)of_id->data;
-
+	priv->chip_irq = i2c->irq;
+	priv->dev = &i2c->dev;
 	priv->regmap = devm_regmap_init_i2c(i2c, &rn5t618_regmap_config);
 	if (IS_ERR(priv->regmap)) {
 		ret = PTR_ERR(priv->regmap);
@@ -137,6 +139,11 @@ static int rn5t618_i2c_probe(struct i2c_client *i2c,
 		return ret;
 	}
 
+	if (priv->chip_irq > 0) {
+		if (rn5t618_irq_init(priv))
+			priv->chip_irq = 0;
+	}
+
 	return 0;
 }
 
@@ -154,15 +161,41 @@ 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->chip_irq)
+		disable_irq(priv->chip_irq);
+
+	return 0;
+}
+
+static int __maybe_unused rn5t618_i2c_resume(struct device *dev)
+{
+	struct rn5t618 *priv = dev_get_drvdata(dev);
+
+	if (priv->chip_irq)
+		enable_irq(priv->chip_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/drivers/mfd/rn5t618-irq.c b/drivers/mfd/rn5t618-irq.c
new file mode 100644
index 000000000000..384fc844bad4
--- /dev/null
+++ b/drivers/mfd/rn5t618-irq.c
@@ -0,0 +1,92 @@
+// SPDX-License-Identifier: GPL-2.0+
+/*
+ * Copyright 2019 Andreas Kemnade
+ */
+#include <linux/device.h>
+#include <linux/interrupt.h>
+#include <linux/irq.h>
+#include <linux/module.h>
+#include <linux/regmap.h>
+
+#include <linux/mfd/rn5t618.h>
+
+static const struct regmap_irq rc5t619_irqs[] = {
+	[RN5T618_IRQ_SYS] = {
+		.reg_offset = 0,
+		.mask = (0 << 1)
+	},
+	[RN5T618_IRQ_DCDC] = {
+		.reg_offset = 0,
+		.mask = (1 << 1)
+	},
+	[RN5T618_IRQ_RTC]  = {
+		.reg_offset = 0,
+		.mask = (1 << 2)
+	},
+	[RN5T618_IRQ_ADC] = {
+		.reg_offset = 0,
+		.mask = (1 << 3)
+	},
+	[RN5T618_IRQ_GPIO] = {
+		.reg_offset = 0,
+		.mask = (1 << 4)
+	},
+#if 0
+/*
+ * REVISIT when implementing charger:
+ * according to some other implementation it needs special treatment,
+ * inverted but experiments seem not to confirm that.
+ */
+	[RN5T618_IRQ_CHG] = {
+		.reg_offset = 0,
+		.mask = (1 << 6),
+	}
+#endif
+};
+
+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,
+};
+
+int rn5t618_irq_init(struct rn5t618 *rn5t618)
+{
+	const struct regmap_irq_chip *irq_chip;
+	int ret;
+
+	if (!rn5t618->chip_irq)
+		return 0;
+
+	switch (rn5t618->variant) {
+	case RC5T619:
+		irq_chip = &rc5t619_irq_chip;
+		break;
+
+		/* TODO: check irq definitions for other variants */
+
+	default:
+		irq_chip = NULL;
+		break;
+	}
+
+	if (!irq_chip) {
+		dev_err(rn5t618->dev, "no IRQ definition known for variant\n");
+		return -ENOENT;
+	}
+
+	ret = devm_regmap_add_irq_chip(rn5t618->dev, rn5t618->regmap,
+				rn5t618->chip_irq,
+				IRQF_TRIGGER_FALLING | IRQF_ONESHOT,
+				0, irq_chip, &rn5t618->irq_data);
+	if (ret != 0) {
+		dev_err(rn5t618->dev, "Failed to register IRQ chip\n");
+		return ret;
+	}
+
+	return 0;
+}
diff --git a/include/linux/mfd/rn5t618.h b/include/linux/mfd/rn5t618.h
index d62ef48060b5..4d680f34ad2f 100644
--- a/include/linux/mfd/rn5t618.h
+++ b/include/linux/mfd/rn5t618.h
@@ -242,9 +242,27 @@ enum {
 	RC5T619,
 };
 
+
+/* RN5T618 IRQ definitions */
+enum {
+	RN5T618_IRQ_SYS,
+	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 chip_irq;
+	struct regmap_irq_chip_data *irq_data;
 };
 
+extern int rn5t618_irq_init(struct rn5t618 *rn5t618);
 #endif /* __LINUX_MFD_RN5T618_H */
-- 
2.11.0



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