[PATCH v2 2/5] mfd: rn5t618: add irq support

Andreas Kemnade
2019-10-31T21:38:59Z

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@kemnade.info>
---
Changes in v2:
- no dead code, did some more testing and thinking for that
- remove extra empty lines
drivers/mfd/Kconfig | 1 +
drivers/mfd/Makefile | 2 +-
drivers/mfd/rn5t618-core.c | 35 ++++++++++++++-
drivers/mfd/rn5t618-irq.c | 85 +++++++++++++++++++++++++++++++++++++
include/linux/mfd/rn5t618.h | 16 +++++++
5 files changed, 137 insertions(+), 2 deletions(-)
create mode 100644 drivers/mfd/rn5t618-irq.c

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/Makefile b/drivers/mfd/Makefile
index 110ea700231b..2906d5db67d0 100644
--- a/drivers/mfd/Makefile
+++ b/drivers/mfd/Makefile
@@ -217,7 +217,7 @@ 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..5d5490f08134
--- /dev/null
+++ b/drivers/mfd/rn5t618-irq.c
@@ -0,0 +1,85 @@
+// 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)
+ },
+ [RN5T618_IRQ_CHG] = {
+ .reg_offset = 0,
+ .mask = (1 << 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,
+};
+
+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..edd2b6485e3b 100644
--- a/include/linux/mfd/rn5t618.h
+++ b/include/linux/mfd/rn5t618.h
@@ -242,9 +242,25 @@ 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 */
--
2.20.1