linux-kernel - [PATCH 2/3] ptp: Add clock name to uevent

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Message-ID: <20241015105414.2825635-3-svens@linux.ibm.com>
Date: Tue, 15 Oct 2024 12:54:13 +0200
From: Sven Schnelle <svens@...ux.ibm.com>
To: Heiko Carstens <hca@...ux.ibm.com>, Vasily Gorbik <gor@...ux.ibm.com>,
        Alexander Gordeev <agordeev@...ux.ibm.com>,
        Christian Borntraeger <borntraeger@...ux.ibm.com>,
        Sven Schnelle <svens@...ux.ibm.com>,
        Richard Cochran <richardcochran@...il.com>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        "Ricardo B. Marliere" <ricardo@...liere.net>
Cc: linux-kernel@...r.kernel.org, linux-s390@...r.kernel.org,
        netdev@...r.kernel.org
Subject: [PATCH 2/3] ptp: Add clock name to uevent

To allow users to have stable device names with the help of udev,
add the name to the udev event that is sent when a new PtP clock
is available. The key is called 'PTP_CLOCK_NAME'.

Signed-off-by: Sven Schnelle <svens@...ux.ibm.com>
---
 drivers/ptp/ptp_clock.c | 11 ++++++++++-
 1 file changed, 10 insertions(+), 1 deletion(-)

diff --git a/drivers/ptp/ptp_clock.c b/drivers/ptp/ptp_clock.c
index c56cd0f63909..15937acb79c6 100644
--- a/drivers/ptp/ptp_clock.c
+++ b/drivers/ptp/ptp_clock.c
@@ -25,9 +25,11 @@
 #define PTP_PPS_EVENT PPS_CAPTUREASSERT
 #define PTP_PPS_MODE (PTP_PPS_DEFAULTS | PPS_CANWAIT | PPS_TSFMT_TSPEC)
 
+static int ptp_udev_uevent(const struct device *dev, struct kobj_uevent_env *env);
 const struct class ptp_class = {
 	.name = "ptp",
-	.dev_groups = ptp_groups
+	.dev_groups = ptp_groups,
+	.dev_uevent = ptp_udev_uevent
 };
 
 /* private globals */
@@ -514,6 +516,13 @@ EXPORT_SYMBOL(ptp_cancel_worker_sync);
 
 /* module operations */
 
+static int ptp_udev_uevent(const struct device *dev, struct kobj_uevent_env *env)
+{
+	struct ptp_clock *ptp = container_of(dev, struct ptp_clock, dev);
+
+	return add_uevent_var(env, "PTP_CLOCK_NAME=%s", ptp->info->name);
+}
+
 static void __exit ptp_exit(void)
 {
 	class_unregister(&ptp_class);
-- 
2.43.0