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Subject[PATCH v3 1/6] rpmsg: char: Export eptdev create an destroy functions
Date
To prepare the split of the code related to the control (ctrldev)
and the endpoint (eptdev) devices in 2 separate files:

- Rename and export the functions in rpmsg_char.h.

- Suppress the dependency with the rpmsg_ctrldev struct in the
rpmsg_eptdev_create function.

- The rpmsg class is provided as parameter in rpmsg_chrdev_create_eptdev,
because the class is associated to the control part.

Suggested-by: Mathieu Poirier <mathieu.poirier@linaro.org>
Signed-off-by: Arnaud Pouliquen <arnaud.pouliquen@foss.st.com>
Reviewed-by: Mathieu Poirier <mathieu.poirier@linaro.org>

---
Update from v2:

- rename functions from rpmsg_chrdev_create/destroy_eptdev to
rpmsg_chrdev_eptdev_create/destroy
---
drivers/rpmsg/rpmsg_char.c | 18 ++++++++------
drivers/rpmsg/rpmsg_char.h | 49 ++++++++++++++++++++++++++++++++++++++
2 files changed, 60 insertions(+), 7 deletions(-)
create mode 100644 drivers/rpmsg/rpmsg_char.h

diff --git a/drivers/rpmsg/rpmsg_char.c b/drivers/rpmsg/rpmsg_char.c
index e4e54f515af6..3c53ece557a9 100644
--- a/drivers/rpmsg/rpmsg_char.c
+++ b/drivers/rpmsg/rpmsg_char.c
@@ -1,5 +1,6 @@
// SPDX-License-Identifier: GPL-2.0
/*
+ * Copyright (C) 2021, STMicroelectronics
* Copyright (c) 2016, Linaro Ltd.
* Copyright (c) 2012, Michal Simek <monstr@monstr.eu>
* Copyright (c) 2012, PetaLogix
@@ -15,6 +16,8 @@
#include <linux/rpmsg.h>
#include <linux/skbuff.h>

+#include "rpmsg_char.h"
+
#define RPMSG_DEV_MAX (MINORMASK + 1)

static dev_t rpmsg_major;
@@ -69,7 +72,7 @@ struct rpmsg_eptdev {
wait_queue_head_t readq;
};

-static int rpmsg_eptdev_destroy(struct device *dev, void *data)
+int rpmsg_chrdev_eptdev_destroy(struct device *dev, void *data)
{
struct rpmsg_eptdev *eptdev = dev_to_eptdev(dev);

@@ -88,6 +91,7 @@ static int rpmsg_eptdev_destroy(struct device *dev, void *data)

return 0;
}
+EXPORT_SYMBOL(rpmsg_chrdev_eptdev_destroy);

static int rpmsg_ept_cb(struct rpmsg_device *rpdev, void *buf, int len,
void *priv, u32 addr)
@@ -271,7 +275,7 @@ static long rpmsg_eptdev_ioctl(struct file *fp, unsigned int cmd,
if (cmd != RPMSG_DESTROY_EPT_IOCTL)
return -EINVAL;

- return rpmsg_eptdev_destroy(&eptdev->dev, NULL);
+ return rpmsg_chrdev_eptdev_destroy(&eptdev->dev, NULL);
}

static const struct file_operations rpmsg_eptdev_fops = {
@@ -330,10 +334,9 @@ static void rpmsg_eptdev_release_device(struct device *dev)
kfree(eptdev);
}

-static int rpmsg_eptdev_create(struct rpmsg_ctrldev *ctrldev,
+int rpmsg_chrdev_eptdev_create(struct rpmsg_device *rpdev, struct device *parent,
struct rpmsg_channel_info chinfo)
{
- struct rpmsg_device *rpdev = ctrldev->rpdev;
struct rpmsg_eptdev *eptdev;
struct device *dev;
int ret;
@@ -353,7 +356,7 @@ static int rpmsg_eptdev_create(struct rpmsg_ctrldev *ctrldev,

device_initialize(dev);
dev->class = rpmsg_class;
- dev->parent = &ctrldev->dev;
+ dev->parent = parent;
dev->groups = rpmsg_eptdev_groups;
dev_set_drvdata(dev, eptdev);

@@ -396,6 +399,7 @@ static int rpmsg_eptdev_create(struct rpmsg_ctrldev *ctrldev,

return ret;
}
+EXPORT_SYMBOL(rpmsg_chrdev_eptdev_create);

static int rpmsg_ctrldev_open(struct inode *inode, struct file *filp)
{
@@ -435,7 +439,7 @@ static long rpmsg_ctrldev_ioctl(struct file *fp, unsigned int cmd,
chinfo.src = eptinfo.src;
chinfo.dst = eptinfo.dst;

- return rpmsg_eptdev_create(ctrldev, chinfo);
+ return rpmsg_chrdev_eptdev_create(ctrldev->rpdev, &ctrldev->dev, chinfo);
};

static const struct file_operations rpmsg_ctrldev_fops = {
@@ -521,7 +525,7 @@ static void rpmsg_chrdev_remove(struct rpmsg_device *rpdev)
int ret;

/* Destroy all endpoints */
- ret = device_for_each_child(&ctrldev->dev, NULL, rpmsg_eptdev_destroy);
+ ret = device_for_each_child(&ctrldev->dev, NULL, rpmsg_chrdev_eptdev_destroy);
if (ret)
dev_warn(&rpdev->dev, "failed to nuke endpoints: %d\n", ret);

diff --git a/drivers/rpmsg/rpmsg_char.h b/drivers/rpmsg/rpmsg_char.h
new file mode 100644
index 000000000000..facd324290a4
--- /dev/null
+++ b/drivers/rpmsg/rpmsg_char.h
@@ -0,0 +1,49 @@
+/* SPDX-License-Identifier: GPL-2.0 WITH Linux-syscall-note */
+/*
+ * Copyright (C) STMicroelectronics 2021.
+ */
+
+#ifndef __RPMSG_CHRDEV_H__
+#define __RPMSG_CHRDEV_H__
+
+#if IS_REACHABLE(CONFIG_RPMSG_CHAR)
+/**
+ * rpmsg_chrdev_eptdev_create() - register char device based on an endpoint
+ * @rpdev: prepared rpdev to be used for creating endpoints
+ * @parent: parent device
+ * @chinfo: assiated endpoint channel information.
+ *
+ * This function create a new rpmsg char endpoint device to instantiate a new
+ * endpoint based on chinfo information.
+ */
+int rpmsg_chrdev_eptdev_create(struct rpmsg_device *rpdev, struct device *parent,
+ struct rpmsg_channel_info chinfo);
+
+/**
+ * rpmsg_chrdev_eptdev_destroy() - destroy created char device endpoint.
+ * @data: private data associated to the endpoint device
+ *
+ * This function destroys a rpmsg char endpoint device created by the RPMSG_DESTROY_EPT_IOCTL
+ * control.
+ */
+int rpmsg_chrdev_eptdev_destroy(struct device *dev, void *data);
+
+#else /*IS_REACHABLE(CONFIG_RPMSG_CHAR) */
+
+static inline int rpmsg_chrdev_eptdev_create(struct rpmsg_device *rpdev, struct device *parent,
+ struct rpmsg_channel_info chinfo)
+{
+ return -EINVAL;
+}
+
+static inline int rpmsg_chrdev_eptdev_destroy(struct device *dev, void *data)
+{
+ /* This shouldn't be possible */
+ WARN_ON(1);
+
+ return 0;
+}
+
+#endif /*IS_REACHABLE(CONFIG_RPMSG_CHAR) */
+
+#endif /*__RPMSG_CHRDEV_H__ */
--
2.17.1
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