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Message-ID: <20211022125426.2579-2-arnaud.pouliquen@foss.st.com>
Date: Fri, 22 Oct 2021 14:54:17 +0200
From: Arnaud Pouliquen <arnaud.pouliquen@...s.st.com>
To: Bjorn Andersson <bjorn.andersson@...aro.org>,
Ohad Ben-Cohen <ohad@...ery.com>,
Mathieu Poirier <mathieu.poirier@...aro.org>
CC: <linux-remoteproc@...r.kernel.org>, <linux-kernel@...r.kernel.org>,
<linux-stm32@...md-mailman.stormreply.com>,
<julien.massot@....bzh>, <arnaud.pouliquen@...s.st.com>
Subject: [PATCH v6 01/10] rpmsg: char: Export eptdev create an destroy functions
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.
Suggested-by: Mathieu Poirier <mathieu.poirier@...aro.org>
Signed-off-by: Arnaud Pouliquen <arnaud.pouliquen@...s.st.com>
---
update vs previous revision:
- add comment to explain the IS_REACHABLE usage
- remove Mathieu Poirier reviewed-by as patch updated
---
drivers/rpmsg/rpmsg_char.c | 18 +++++++-----
drivers/rpmsg/rpmsg_char.h | 57 ++++++++++++++++++++++++++++++++++++++
2 files changed, 68 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 b5907b80727c..941c5c54dd72 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@...str.eu>
* Copyright (c) 2012, PetaLogix
@@ -22,6 +23,8 @@
#include <linux/uaccess.h>
#include <uapi/linux/rpmsg.h>
+#include "rpmsg_char.h"
+
#define RPMSG_DEV_MAX (MINORMASK + 1)
static dev_t rpmsg_major;
@@ -76,7 +79,7 @@ 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);
@@ -95,6 +98,7 @@ 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)
@@ -278,7 +282,7 @@ 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 = {
@@ -337,10 +341,9 @@ 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;
@@ -360,7 +363,7 @@ 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);
@@ -403,6 +406,7 @@ 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)
{
@@ -442,7 +446,7 @@ 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 = {
@@ -528,7 +532,7 @@ 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..109c2c43005f
--- /dev/null
+++ b/drivers/rpmsg/rpmsg_char.h
@@ -0,0 +1,57 @@
+/* SPDX-License-Identifier: GPL-2.0 WITH Linux-syscall-note */
+/*
+ * Copyright (C) STMicroelectronics 2021.
+ */
+
+#ifndef __RPMSG_CHRDEV_H__
+#define __RPMSG_CHRDEV_H__
+
+/*
+ * The IS_REACHABLE macro is used here to prevent unresolved symbol error during link,
+ * building with RPMSG_CHAR=m and RPMSG_CTRL=y configuration.
+ * In such case a kernel warning is printed to help develloper to fix the issue.
+ */
+
+#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: associated 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)
+{
+ /* This shouldn't be possible */
+ WARN_ON(1);
+ 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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