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From 9ec20c5b243d6f1f83b38b57474cf532c4575a02 Mon Sep 17 00:00:00 2001
From: John Ogness <john.ogness@linutronix.de>
Date: Fri, 15 Feb 2019 12:58:25 +0106
Subject: [PATCH] hello: add custom sysfs files
Signed-off-by: John Ogness <john.ogness@linutronix.de>
---
hello.c | 26 ++++++++++++++++++++++
1 file changed, 26 insertions(+)
diff --git a/hello.c b/hello.c
index 7f78d06..4c7989a 100644
--- a/hello.c
+++ b/hello.c
@@ -77,6 +77,30 @@ static const struct file_operations hello_fops = {
.write = hello_write,
};
+static ssize_t major_show(struct device *dev,
+ struct device_attribute *attr, char *buf)
+{
+ return sprintf(buf, "%d\n", MAJOR(hello_devt));
+}
+static DEVICE_ATTR_RO(major);
+
+static ssize_t minor_show(struct device *dev,
+ struct device_attribute *attr, char *buf)
+{
+ struct platform_device *pdev = to_platform_device(dev);
+ struct hello_dev *hello = platform_get_drvdata(pdev);
+
+ return sprintf(buf, "%d\n", hello->minor);
+}
+static DEVICE_ATTR_RO(minor);
+
+static struct attribute *hello_device_attrs[] = {
+ &dev_attr_major.attr,
+ &dev_attr_minor.attr,
+ NULL,
+};
+ATTRIBUTE_GROUPS(hello_device);
+
static int hello_probe(struct platform_device *pdev)
{
struct hello_dev *hello;
@@ -187,6 +211,8 @@ static int __init hello_init(void)
goto err_region;
}
+ hello_class->dev_groups = hello_device_groups;
+
ret = platform_driver_register(&hello_driver);
if (ret != 0)
goto err_class;
--
2.1.4
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