linux-kernel - [PATCH v2 4/4] rtc: isl1208: Add "evdet" interrupt source for isl1219.

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Date:   Wed, 28 Feb 2018 12:45:47 +0000
From:   Denis OSTERLAND <denis.osterland@...hl.com>
To:     "a.zummo@...ertech.it" <a.zummo@...ertech.it>,
        "alexandre.belloni@...e-electrons.com" 
        <alexandre.belloni@...e-electrons.com>
CC:     "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "mgr@...gutronix.de" <mgr@...gutronix.de>,
        "devicetree@...r.kernel.org" <devicetree@...r.kernel.org>,
        "linux@...ck-us.net" <linux@...ck-us.net>,
        "jdelvare@...e.com" <jdelvare@...e.com>,
        "linux-rtc@...r.kernel.org" <linux-rtc@...r.kernel.org>,
        "kernel@...gutronix.de" <kernel@...gutronix.de>,
        Denis OSTERLAND <denis.osterland@...hl.com>
Subject: [PATCH v2 4/4] rtc: isl1208: Add "evdet" interrupt source for
 isl1219.

From: Denis Osterland <Denis.Osterland@...hl.com>

Add support for "evdet" named interrupt source.

The check if i2c client irq matches evdet irq is needed
for the case that there is only one interrupt named "evdet".
In this case i2c client code handles this like an unnamed
interrupt souce and assigns the value.

Signed-off-by: Denis Osterland <Denis.Osterland@...hl.com>
Reviewed-by: Michael Grzeschik <m.grzeschik@...gutronix.de>
---
 drivers/rtc/rtc-isl1208.c | 47 +++++++++++++++++++++++++++++++----------------
 1 file changed, 31 insertions(+), 16 deletions(-)

diff --git a/drivers/rtc/rtc-isl1208.c b/drivers/rtc/rtc-isl1208.c
index 164371b..f2f148b 100644
--- a/drivers/rtc/rtc-isl1208.c
+++ b/drivers/rtc/rtc-isl1208.c
@@ -14,6 +14,7 @@
 #include <linux/i2c.h>
 #include <linux/bcd.h>
 #include <linux/rtc.h>
+#include <linux/of_irq.h>
 
 /* Register map */
 /* rtc section */
@@ -79,6 +80,7 @@ enum {
 struct isl1208 {
 	struct rtc_device *rtc;
 	const struct attribute_group *sysfs_files;
+	int evdet_irq;
 };
 
 /* block read */
@@ -730,6 +732,24 @@ static const struct attribute_group isl1219_rtc_sysfs_files = {
 	.attrs	= isl1219_rtc_attrs,
 };
 
+static int isl1208_setup_irq(struct i2c_client *client, int irq)
+{
+	int rc = devm_request_threaded_irq(&client->dev, irq, NULL,
+					isl1208_rtc_interrupt,
+					IRQF_SHARED | IRQF_ONESHOT,
+					isl1208_driver.driver.name,
+					client);
+	if (!rc) {
+		device_init_wakeup(&client->dev, 1);
+		enable_irq_wake(irq);
+	} else {
+		dev_err(&client->dev,
+			"Unable to request irq %d, no alarm support\n",
+			irq);
+	}
+	return rc;
+}
+
 static int
 isl1208_probe(struct i2c_client *client, const struct i2c_device_id *id)
 {
@@ -772,6 +792,8 @@ isl1208_probe(struct i2c_client *client, const struct i2c_device_id *id)
 			return rc;
 		}
 		isl1208->sysfs_files = &isl1219_rtc_sysfs_files;
+		isl1208->evdet_irq = of_irq_get_byname(client->dev.of_node,
+								"evdet");
 	} else {
 		isl1208->sysfs_files = &isl1208_rtc_sysfs_files;
 	}
@@ -780,22 +802,15 @@ isl1208_probe(struct i2c_client *client, const struct i2c_device_id *id)
 	if (rc)
 		return rc;
 
-	if (client->irq > 0) {
-		rc = devm_request_threaded_irq(&client->dev, client->irq, NULL,
-					       isl1208_rtc_interrupt,
-					       IRQF_SHARED | IRQF_ONESHOT,
-					       isl1208_driver.driver.name,
-					       client);
-		if (!rc) {
-			device_init_wakeup(&client->dev, 1);
-			enable_irq_wake(client->irq);
-		} else {
-			dev_err(&client->dev,
-				"Unable to request irq %d, no alarm support\n",
-				client->irq);
-			client->irq = 0;
-		}
-	}
+	if (client->irq > 0)
+		rc = isl1208_setup_irq(client, client->irq);
+	if (rc)
+		return rc;
+
+	if (isl1208->evdet_irq > 0 && isl1208->evdet_irq != client->irq)
+		rc = isl1208_setup_irq(client, isl1208->evdet_irq);
+	if (rc)
+		return rc;
 
 	return rtc_register_device(isl1208->rtc);
 }
-- 
2.7.4


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