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path: root/drivers/infiniband/hw/hfi1/device.c
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Diffstat (limited to 'drivers/infiniband/hw/hfi1/device.c')
-rw-r--r--drivers/infiniband/hw/hfi1/device.c132
1 files changed, 132 insertions, 0 deletions
diff --git a/drivers/infiniband/hw/hfi1/device.c b/drivers/infiniband/hw/hfi1/device.c
new file mode 100644
index 0000000000..b0a00b7aae
--- /dev/null
+++ b/drivers/infiniband/hw/hfi1/device.c
@@ -0,0 +1,132 @@
+// SPDX-License-Identifier: GPL-2.0 or BSD-3-Clause
+/*
+ * Copyright(c) 2015, 2016 Intel Corporation.
+ */
+
+#include <linux/cdev.h>
+#include <linux/device.h>
+#include <linux/fs.h>
+
+#include "hfi.h"
+#include "device.h"
+
+static char *hfi1_devnode(const struct device *dev, umode_t *mode)
+{
+ if (mode)
+ *mode = 0600;
+ return kasprintf(GFP_KERNEL, "%s", dev_name(dev));
+}
+
+static const struct class class = {
+ .name = "hfi1",
+ .devnode = hfi1_devnode,
+};
+
+static char *hfi1_user_devnode(const struct device *dev, umode_t *mode)
+{
+ if (mode)
+ *mode = 0666;
+ return kasprintf(GFP_KERNEL, "%s", dev_name(dev));
+}
+
+static const struct class user_class = {
+ .name = "hfi1_user",
+ .devnode = hfi1_user_devnode,
+};
+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;
+}
+
+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;
+ }
+
+ ret = class_register(&class);
+ if (ret) {
+ pr_err("Could not create device class (err %d)\n", -ret);
+ unregister_chrdev_region(hfi1_dev, HFI1_NMINORS);
+ goto done;
+ }
+
+ ret = class_register(&user_class);
+ if (ret) {
+ pr_err("Could not create device class for user accessible files (err %d)\n",
+ -ret);
+ class_unregister(&class);
+ unregister_chrdev_region(hfi1_dev, HFI1_NMINORS);
+ goto done;
+ }
+
+done:
+ return ret;
+}
+
+void dev_cleanup(void)
+{
+ class_unregister(&class);
+ class_unregister(&user_class);
+
+ unregister_chrdev_region(hfi1_dev, HFI1_NMINORS);
+}