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// SPDX-License-Identifier: GPL-2.0 or BSD-3-Clause
/*
* Copyright(c) 2015, 2016 Intel Corporation.
*/
#include <linux/cdev.h>
#include <linux/module.h>
#include <linux/device.h>
#include <linux/fs.h>
#include "hfi.h"
#include "device.h"
static struct class *class;
static struct class *user_class;
static dev_t hfi1_dev;
int hfi1_cdev_init(int minor, const char *name,
const struct file_operations *fops,
struct cdev *cdev, struct device **devp,
bool user_accessible,
struct kobject *parent)
{
const dev_t dev = MKDEV(MAJOR(hfi1_dev), minor);
struct device *device = NULL;
int ret;
cdev_init(cdev, fops);
cdev->owner = THIS_MODULE;
cdev_set_parent(cdev, parent);
kobject_set_name(&cdev->kobj, name);
ret = cdev_add(cdev, dev, 1);
if (ret < 0) {
pr_err("Could not add cdev for minor %d, %s (err %d)\n",
minor, name, -ret);
goto done;
}
if (user_accessible)
device = device_create(user_class, NULL, dev, NULL, "%s", name);
else
device = device_create(class, NULL, dev, NULL, "%s", name);
if (IS_ERR(device)) {
ret = PTR_ERR(device);
device = NULL;
pr_err("Could not create device for minor %d, %s (err %d)\n",
minor, name, -ret);
cdev_del(cdev);
}
done:
*devp = device;
return ret;
}
void hfi1_cdev_cleanup(struct cdev *cdev, struct device **devp)
{
struct device *device = *devp;
if (device) {
device_unregister(device);
*devp = NULL;
cdev_del(cdev);
}
}
static const char *hfi1_class_name = "hfi1";
const char *class_name(void)
{
return hfi1_class_name;
}
static char *hfi1_devnode(struct device *dev, umode_t *mode)
{
if (mode)
*mode = 0600;
return kasprintf(GFP_KERNEL, "%s", dev_name(dev));
}
static const char *hfi1_class_name_user = "hfi1_user";
static const char *class_name_user(void)
{
return hfi1_class_name_user;
}
static char *hfi1_user_devnode(struct device *dev, umode_t *mode)
{
if (mode)
*mode = 0666;
return kasprintf(GFP_KERNEL, "%s", dev_name(dev));
}
int __init dev_init(void)
{
int ret;
ret = alloc_chrdev_region(&hfi1_dev, 0, HFI1_NMINORS, DRIVER_NAME);
if (ret < 0) {
pr_err("Could not allocate chrdev region (err %d)\n", -ret);
goto done;
}
class = class_create(THIS_MODULE, class_name());
if (IS_ERR(class)) {
ret = PTR_ERR(class);
pr_err("Could not create device class (err %d)\n", -ret);
unregister_chrdev_region(hfi1_dev, HFI1_NMINORS);
goto done;
}
class->devnode = hfi1_devnode;
user_class = class_create(THIS_MODULE, class_name_user());
if (IS_ERR(user_class)) {
ret = PTR_ERR(user_class);
pr_err("Could not create device class for user accessible files (err %d)\n",
-ret);
class_destroy(class);
class = NULL;
user_class = NULL;
unregister_chrdev_region(hfi1_dev, HFI1_NMINORS);
goto done;
}
user_class->devnode = hfi1_user_devnode;
done:
return ret;
}
void dev_cleanup(void)
{
class_destroy(class);
class = NULL;
class_destroy(user_class);
user_class = NULL;
unregister_chrdev_region(hfi1_dev, HFI1_NMINORS);
}
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