linux-kernel - [PATCH RFC 7/9] iio: trigger: Add new API iio_trigger_attach

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite for Android: free password hash cracker in your pocket

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Message-ID: <20250519-timestamp-v1-7-fcb4f6c2721c@gmail.com>
Date: Mon, 19 May 2025 23:25:59 +0900
From: Gyeyoung Baek <gye976@...il.com>
To: Jonathan Cameron <jic23@...nel.org>,
	David Lechner <dlechner@...libre.com>,
	Nuno Sá <nuno.sa@...log.com>,
	Andy Shevchenko <andy@...nel.org>
Cc: Gyeyoung Baek <gye976@...il.com>,
	linux-iio@...r.kernel.org,
	linux-kernel@...r.kernel.org
Subject: [PATCH RFC 7/9] iio: trigger: Add new API iio_trigger_attach_timestamp()

This new API is used in `iio_poll_func_register()` to handle the case
where the trigger writes a timestamp directly into the consumer (i.e. early_timestamp == true).

Signed-off-by: Gyeyoung Baek <gye976@...il.com>
---
 drivers/iio/industrialio-trigger.c | 22 ++++++++++++++++++++++
 1 file changed, 22 insertions(+)

diff --git a/drivers/iio/industrialio-trigger.c b/drivers/iio/industrialio-trigger.c
index d6b0e1ec4153..f394933b9d0a 100644
--- a/drivers/iio/industrialio-trigger.c
+++ b/drivers/iio/industrialio-trigger.c
@@ -288,6 +288,15 @@ static void iio_trigger_put_irq(struct iio_trigger *trig, int irq)
 	clear_bit(irq - trig->subirq_base, trig->pool);
 }
 
+static int iio_trigger_attach_timestamp(struct iio_trigger *trig,
+					  struct iio_poll_func *pf)
+{
+	/* RFC */
+	trig->consumer_pf[pf->irq - trig->subirq_base] = pf;
+
+	return 0;
+}
+
 static int iio_poll_func_register(struct iio_poll_func *pf,
 				  struct iio_trigger *trig)
 {
@@ -302,6 +311,16 @@ static int iio_poll_func_register(struct iio_poll_func *pf,
 	if (!pf->timestamp_enabled)
 		goto out_request_irq;
 
+	/*
+	 * The trigger supports grabbing timestamp.
+	 * Just request raw irq handler.
+	 */
+	if (trig->early_timestamp) {
+		ret = iio_trigger_attach_timestamp(trig, pf);
+		pf->timestamp_type = IIO_TIMESTAMP_TYPE_TRIGGER;
+		goto out_request_irq;
+	}
+
 	if (trig->trig_type & IIO_TRIG_TYPE_POLL_NESTED) {
 		bottomhalf = iio_pollfunc_bottom_half_wrapper;
 		pf->timestamp_type = IIO_TIMESTAMP_TYPE_CONSUMER_BOTTOM_HALF;
@@ -395,6 +414,9 @@ int iio_trigger_detach_poll_func(struct iio_trigger *trig,
 	module_put(iio_dev_opaque->driver_module);
 	pf->irq = 0;
 
+	/* RFC */
+	trig->consumer_pf[pf->irq - trig->subirq_base] = NULL;
+
 	return ret;
 }
 

-- 
2.43.0