[PATCH v2 11/49] IB/hfi1: add char device instantiation code

Mike Marciniszyn
2015-06-15T13:26:57Z

drivers/infiniband/hw/hfi1/device.c | 142 +++++++++++++++++++++++++++++++++++
drivers/infiniband/hw/hfi1/device.h | 61 +++++++++++++++
2 files changed, 203 insertions(+)
create mode 100644 drivers/infiniband/hw/hfi1/device.c
create mode 100644 drivers/infiniband/hw/hfi1/device.h

diff --git a/drivers/infiniband/hw/hfi1/device.c b/drivers/infiniband/hw/hfi1/device.c
new file mode 100644
index 0000000..07c87a87
--- /dev/null
+++ b/drivers/infiniband/hw/hfi1/device.c
@@ -0,0 +1,142 @@
+/*
+ *
+ * This file is provided under a dual BSD/GPLv2 license. When using or
+ * redistributing this file, you may do so under either license.
+ *
+ * GPL LICENSE SUMMARY
+ *
+ * Copyright(c) 2015 Intel Corporation.
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of version 2 of the GNU General Public License as
+ * published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope that it will be useful, but
+ * WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+ * General Public License for more details.
+ *
+ * BSD LICENSE
+ *
+ * Copyright(c) 2015 Intel Corporation.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ *
+ * - Redistributions of source code must retain the above copyright
+ * notice, this list of conditions and the following disclaimer.
+ * - Redistributions in binary form must reproduce the above copyright
+ * notice, this list of conditions and the following disclaimer in
+ * the documentation and/or other materials provided with the
+ * distribution.
+ * - Neither the name of Intel Corporation nor the names of its
+ * contributors may be used to endorse or promote products derived
+ * from this software without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+ * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+ * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+ * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+ * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+ * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+ * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+ * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+ * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+ * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+ * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ *
+ */
+
+#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 dev_t hfi1_dev;
+
+int hfi1_cdev_init(int minor, const char *name,
+ const struct file_operations *fops,
+ struct cdev *cdev, struct device **devp)
+{
+ const dev_t dev = MKDEV(MAJOR(hfi1_dev), minor);
+ struct device *device = NULL;
+ int ret;
+
+ cdev_init(cdev, fops);
+ cdev->owner = THIS_MODULE;
+ 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;
+ }
+
+ device = device_create(class, NULL, dev, NULL, "%s", name);
+ if (!IS_ERR(device))
+ goto done;
+ 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;
+ }
+
+ 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);
+ }
+
+done:
+ return ret;
+}
+
+void dev_cleanup(void)
+{
+ if (class) {
+ class_destroy(class);
+ class = NULL;
+ }
+
+ unregister_chrdev_region(hfi1_dev, HFI1_NMINORS);
+}
diff --git a/drivers/infiniband/hw/hfi1/device.h b/drivers/infiniband/hw/hfi1/device.h
new file mode 100644
index 0000000..98caecd
--- /dev/null
+++ b/drivers/infiniband/hw/hfi1/device.h
@@ -0,0 +1,61 @@
+#ifndef _HFI1_DEVICE_H
+#define _HFI1_DEVICE_H
+/*
+ *
+ * This file is provided under a dual BSD/GPLv2 license. When using or
+ * redistributing this file, you may do so under either license.
+ *
+ * GPL LICENSE SUMMARY
+ *
+ * Copyright(c) 2015 Intel Corporation.
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of version 2 of the GNU General Public License as
+ * published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope that it will be useful, but
+ * WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+ * General Public License for more details.
+ *
+ * BSD LICENSE
+ *
+ * Copyright(c) 2015 Intel Corporation.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ *
+ * - Redistributions of source code must retain the above copyright
+ * notice, this list of conditions and the following disclaimer.
+ * - Redistributions in binary form must reproduce the above copyright
+ * notice, this list of conditions and the following disclaimer in
+ * the documentation and/or other materials provided with the
+ * distribution.
+ * - Neither the name of Intel Corporation nor the names of its
+ * contributors may be used to endorse or promote products derived
+ * from this software without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+ * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+ * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+ * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+ * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+ * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+ * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+ * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+ * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+ * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+ * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ *
+ */
+
+int hfi1_cdev_init(int minor, const char *name,
+ const struct file_operations *fops,
+ struct cdev *cdev, struct device **devp);
+void hfi1_cdev_cleanup(struct cdev *cdev, struct device **devp);
+const char *class_name(void);
+int __init dev_init(void);
+void dev_cleanup(void);
+
+#endif /* _HFI1_DEVICE_H */