mirror of
https://github.com/epasveer/seer.git
synced 2026-08-31 09:30:41 +08:00
QuangNguyenMinh123
78 lines
2.0 KiB
C
78 lines
2.0 KiB
C
#include <linux/module.h>
|
|
#include <linux/platform_device.h>
|
|
#include <linux/of.h>
|
|
#include <linux/sysfs.h>
|
|
#include <linux/slab.h>
|
|
|
|
MODULE_LICENSE("GPL");
|
|
MODULE_AUTHOR("Developer");
|
|
MODULE_DESCRIPTION("Simple platform driver with DT compatible and sysfs for Raspberry Pi 4");
|
|
MODULE_VERSION("1.0");
|
|
|
|
struct myplatform_dev {
|
|
struct device *dev;
|
|
u32 id;
|
|
};
|
|
|
|
/* sysfs: read the device id assigned at probe */
|
|
static ssize_t id_show(struct device *dev, struct device_attribute *attr, char *buf)
|
|
{
|
|
struct myplatform_dev *priv = dev_get_drvdata(dev);
|
|
return sysfs_emit(buf, "%u\n", priv->id);
|
|
}
|
|
static DEVICE_ATTR_RO(id);
|
|
|
|
static struct attribute *myplatform_attrs[] = {
|
|
&dev_attr_id.attr,
|
|
NULL,
|
|
};
|
|
ATTRIBUTE_GROUPS(myplatform);
|
|
|
|
static int myplatform_probe(struct platform_device *pdev)
|
|
{
|
|
struct myplatform_dev *priv;
|
|
u32 id = 0;
|
|
|
|
priv = devm_kzalloc(&pdev->dev, sizeof(*priv), GFP_KERNEL);
|
|
if (!priv)
|
|
return -ENOMEM;
|
|
|
|
priv->dev = &pdev->dev;
|
|
|
|
/* Read optional "id" property from DT node, default 0 */
|
|
of_property_read_u32(pdev->dev.of_node, "id", &id);
|
|
priv->id = id;
|
|
|
|
platform_set_drvdata(pdev, priv);
|
|
|
|
dev_info(&pdev->dev, "myplatform: probed (id=%u, node=%s)\n",
|
|
priv->id, pdev->dev.of_node->name);
|
|
return 0;
|
|
}
|
|
|
|
static int myplatform_remove(struct platform_device *pdev)
|
|
{
|
|
dev_info(&pdev->dev, "myplatform: removed\n");
|
|
return 0;
|
|
}
|
|
|
|
static const struct of_device_id myplatform_of_match[] = {
|
|
{ .compatible = "rpi4,myplatform" },
|
|
{ /* sentinel */ }
|
|
};
|
|
MODULE_DEVICE_TABLE(of, myplatform_of_match);
|
|
|
|
static struct platform_driver myplatform_driver = {
|
|
.probe = myplatform_probe,
|
|
.remove = myplatform_remove,
|
|
.driver = {
|
|
.name = "myplatform",
|
|
.of_match_table = myplatform_of_match,
|
|
.dev_groups = myplatform_groups,
|
|
},
|
|
};
|
|
|
|
/* Expands to module_init / module_exit wrappers around
|
|
* platform_driver_register / platform_driver_unregister */
|
|
module_platform_driver(myplatform_driver);
|