From: Arnaud Pouliquen <arnaud.pouliquen@foss.st.com>
To: Bjorn Andersson <bjorn.andersson@linaro.org>,
Ohad Ben-Cohen <ohad@wizery.com>,
Mathieu Poirier <mathieu.poirier@linaro.org>
Cc: <linux-remoteproc@vger.kernel.org>,
<linux-kernel@vger.kernel.org>,
<linux-stm32@st-md-mailman.stormreply.com>,
<julien.massot@iot.bzh>, <arnaud.pouliquen@foss.st.com>
Subject: [PATCH v2 4/4] rpmsg: char: Introduce the "rpmsg-raw" channel
Date: Wed, 23 Jun 2021 17:05:04 +0200 [thread overview]
Message-ID: <20210623150504.14450-5-arnaud.pouliquen@foss.st.com> (raw)
In-Reply-To: <20210623150504.14450-1-arnaud.pouliquen@foss.st.com>
Allows to probe the endpoint device on a remote name service announcement,
by registering a rpmsg_driverfor the "rpmsg-raw" channel.
With this patch the /dev/rpmsgX interface can be instantiated by the remote
firmware.
Signed-off-by: Arnaud Pouliquen <arnaud.pouliquen@foss.st.com>
---
update vs V1:
- management of the default endpoint creation in the driver probe.
---
drivers/rpmsg/rpmsg_char.c | 75 +++++++++++++++++++++++++++++++++++++-
1 file changed, 73 insertions(+), 2 deletions(-)
diff --git a/drivers/rpmsg/rpmsg_char.c b/drivers/rpmsg/rpmsg_char.c
index a75dce1e29d8..3748de00c97b 100644
--- a/drivers/rpmsg/rpmsg_char.c
+++ b/drivers/rpmsg/rpmsg_char.c
@@ -25,6 +25,8 @@
#include "rpmsg_char.h"
+#define RPMSG_CHAR_DEVNAME "rpmsg-raw"
+
static dev_t rpmsg_major;
static struct class *rpmsg_class;
@@ -421,6 +423,61 @@ int rpmsg_chrdev_eptdev_create(struct rpmsg_device *rpdev, struct device *parent
}
EXPORT_SYMBOL(rpmsg_chrdev_eptdev_create);
+static int rpmsg_chrdev_probe(struct rpmsg_device *rpdev)
+{
+ struct rpmsg_channel_info chinfo;
+ struct rpmsg_eptdev *eptdev;
+ struct rpmsg_endpoint *ept;
+
+ memcpy(chinfo.name, RPMSG_CHAR_DEVNAME, sizeof(RPMSG_CHAR_DEVNAME));
+ chinfo.src = rpdev->src;
+ chinfo.dst = rpdev->dst;
+
+ eptdev = __rpmsg_chrdev_eptdev_create(rpdev, &rpdev->dev, chinfo);
+ if (IS_ERR(eptdev))
+ return PTR_ERR(eptdev);
+
+ /*
+ * Create the default endpoint associated to the rpmsg device and provide rpmsg_eptdev
+ * structure as callback private data.
+ */
+ ept = rpmsg_create_default_ept(rpdev, rpmsg_ept_cb, eptdev, eptdev->chinfo);
+ if (!ept) {
+ dev_err(&rpdev->dev, "failed to create %s\n", eptdev->chinfo.name);
+ put_device(&eptdev->dev);
+ return -EINVAL;
+ }
+
+ /*
+ * Do not allow the creation and release of an endpoint on /dev/rpmsgX open and close,
+ * reuse the default endpoint instead
+ */
+ eptdev->static_ept = true;
+
+ return 0;
+}
+
+static void rpmsg_chrdev_remove(struct rpmsg_device *rpdev)
+{
+ int ret;
+
+ ret = device_for_each_child(&rpdev->dev, NULL, rpmsg_chrdev_eptdev_destroy);
+ if (ret)
+ dev_warn(&rpdev->dev, "failed to destroy endpoints: %d\n", ret);
+}
+
+static struct rpmsg_device_id rpmsg_chrdev_id_table[] = {
+ { .name = RPMSG_CHAR_DEVNAME },
+ { },
+};
+
+static struct rpmsg_driver rpmsg_chrdev_driver = {
+ .probe = rpmsg_chrdev_probe,
+ .remove = rpmsg_chrdev_remove,
+ .id_table = rpmsg_chrdev_id_table,
+ .drv.name = "rpmsg_chrdev",
+};
+
static int rpmsg_chrdev_init(void)
{
int ret;
@@ -434,16 +491,30 @@ static int rpmsg_chrdev_init(void)
rpmsg_class = class_create(THIS_MODULE, "rpmsg");
if (IS_ERR(rpmsg_class)) {
pr_err("failed to create rpmsg class\n");
- unregister_chrdev_region(rpmsg_major, RPMSG_DEV_MAX);
- return PTR_ERR(rpmsg_class);
+ ret = PTR_ERR(rpmsg_class);
+ goto free_region;
+ }
+
+ ret = register_rpmsg_driver(&rpmsg_chrdev_driver);
+ if (ret < 0) {
+ pr_err("rpmsg: failed to register rpmsg raw driver\n");
+ goto free_class;
}
return 0;
+
+free_class:
+ class_destroy(rpmsg_class);
+free_region:
+ unregister_chrdev_region(rpmsg_major, RPMSG_DEV_MAX);
+
+ return ret;
}
postcore_initcall(rpmsg_chrdev_init);
static void rpmsg_chrdev_exit(void)
{
+ unregister_rpmsg_driver(&rpmsg_chrdev_driver);
class_destroy(rpmsg_class);
unregister_chrdev_region(rpmsg_major, RPMSG_DEV_MAX);
}
--
2.17.1
next prev parent reply other threads:[~2021-06-23 15:08 UTC|newest]
Thread overview: 10+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-06-23 15:05 [PATCH v2 0/4] rpmsg: char: introduce the rpmsg-raw channel Arnaud Pouliquen
2021-06-23 15:05 ` [PATCH v2 1/4] rpmsg: Introduce rpmsg_create_default_ept function Arnaud Pouliquen
2021-06-30 20:38 ` Mathieu Poirier
2021-06-23 15:05 ` [PATCH v2 2/4] rpmsg: char: Introduce __rpmsg_chrdev_create_eptdev function Arnaud Pouliquen
2021-06-30 20:38 ` Mathieu Poirier
2021-06-23 15:05 ` [PATCH v2 3/4] rpmsg: char: Add possibility to use default endpoint of the rpmsg device Arnaud Pouliquen
2021-06-30 20:48 ` Mathieu Poirier
2021-07-01 7:34 ` Arnaud POULIQUEN
2021-06-23 15:05 ` Arnaud Pouliquen [this message]
2021-06-30 20:53 ` [PATCH v2 4/4] rpmsg: char: Introduce the "rpmsg-raw" channel Mathieu Poirier
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
Avoid top-posting and favor interleaved quoting:
https://en.wikipedia.org/wiki/Posting_style#Interleaved_style
* Reply using the --to, --cc, and --in-reply-to
switches of git-send-email(1):
git send-email \
--in-reply-to=20210623150504.14450-5-arnaud.pouliquen@foss.st.com \
--to=arnaud.pouliquen@foss.st.com \
--cc=bjorn.andersson@linaro.org \
--cc=julien.massot@iot.bzh \
--cc=linux-kernel@vger.kernel.org \
--cc=linux-remoteproc@vger.kernel.org \
--cc=linux-stm32@st-md-mailman.stormreply.com \
--cc=mathieu.poirier@linaro.org \
--cc=ohad@wizery.com \
/path/to/YOUR_REPLY
https://kernel.org/pub/software/scm/git/docs/git-send-email.html
* If your mail client supports setting the In-Reply-To header
via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line
before the message body.
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox;
as well as URLs for NNTP newsgroup(s).