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From: William Breathitt Gray <vilhelm.gray@gmail.com>
To: jic23@kernel.org
Cc: linux-stm32@st-md-mailman.stormreply.com, kernel@pengutronix.de,
	a.fatoum@pengutronix.de, kamel.bouhara@bootlin.com,
	gwendal@chromium.org, alexandre.belloni@bootlin.com,
	david@lechnology.com, linux-iio@vger.kernel.org,
	linux-kernel@vger.kernel.org,
	linux-arm-kernel@lists.infradead.org, syednwaris@gmail.com,
	patrick.havelange@essensium.com, fabrice.gasnier@st.com,
	mcoquelin.stm32@gmail.com, alexandre.torgue@st.com,
	o.rempel@pengutronix.de, jarkko.nikula@linux.intel.com,
	William Breathitt Gray <vilhelm.gray@gmail.com>,
	Dan Carpenter <dan.carpenter@oracle.com>
Subject: [PATCH v16 10/14] counter: Implement signalZ_action_component_id sysfs attribute
Date: Fri, 27 Aug 2021 12:47:54 +0900	[thread overview]
Message-ID: <e87de8c56bd9cb5c204c12866de6c04199dee9fa.1630031207.git.vilhelm.gray@gmail.com> (raw)
In-Reply-To: <cover.1630031207.git.vilhelm.gray@gmail.com>

The Generic Counter chrdev interface expects users to supply component
IDs in order to select Synapses for requests. In order for users to know
what component ID belongs to which Synapse this information must be
exposed. The signalZ_action_component_id attribute provides a way for
users to discover what component ID belongs to the respective Synapse.

Cc: Gwendal Grignou <gwendal@chromium.org>
Cc: Dan Carpenter <dan.carpenter@oracle.com>
Reviewed-by: David Lechner <david@lechnology.com>
Signed-off-by: William Breathitt Gray <vilhelm.gray@gmail.com>
---
 Documentation/ABI/testing/sysfs-bus-counter |  7 ++++
 drivers/counter/counter-sysfs.c             | 45 +++++++++++++++++++++
 2 files changed, 52 insertions(+)

diff --git a/Documentation/ABI/testing/sysfs-bus-counter b/Documentation/ABI/testing/sysfs-bus-counter
index dee79b606847..aa2cd3c10d74 100644
--- a/Documentation/ABI/testing/sysfs-bus-counter
+++ b/Documentation/ABI/testing/sysfs-bus-counter
@@ -203,6 +203,13 @@ Description:
 		both edges:
 			Any state transition.
 
+What:		/sys/bus/counter/devices/counterX/countY/signalZ_action_component_id
+KernelVersion:	5.16
+Contact:	linux-iio@vger.kernel.org
+Description:
+		Read-only attribute that indicates the component ID of the
+		respective Synapse of Count Y for Signal Z.
+
 What:		/sys/bus/counter/devices/counterX/countY/spike_filter_ns
 KernelVersion:	5.14
 Contact:	linux-iio@vger.kernel.org
diff --git a/drivers/counter/counter-sysfs.c b/drivers/counter/counter-sysfs.c
index 108cbd838eb9..ee7ff1cde454 100644
--- a/drivers/counter/counter-sysfs.c
+++ b/drivers/counter/counter-sysfs.c
@@ -532,6 +532,46 @@ static int counter_name_attr_create(struct device *const dev,
 	return 0;
 }
 
+static ssize_t counter_comp_id_show(struct device *dev,
+				    struct device_attribute *attr, char *buf)
+{
+	const size_t id = (size_t)to_counter_attribute(attr)->comp.priv;
+
+	return sprintf(buf, "%zu\n", id);
+}
+
+static int counter_comp_id_attr_create(struct device *const dev,
+				       struct counter_attribute_group *const group,
+				       const char *name, const size_t id)
+{
+	struct counter_attribute *counter_attr;
+
+	/* Allocate Counter attribute */
+	counter_attr = devm_kzalloc(dev, sizeof(*counter_attr), GFP_KERNEL);
+	if (!counter_attr)
+		return -ENOMEM;
+
+	/* Generate component ID name */
+	name = devm_kasprintf(dev, GFP_KERNEL, "%s_component_id", name);
+	if (!name)
+		return -ENOMEM;
+
+	/* Configure Counter attribute */
+	counter_attr->comp.priv = (void *)id;
+
+	/* Configure device attribute */
+	sysfs_attr_init(&counter_attr->dev_attr.attr);
+	counter_attr->dev_attr.attr.name = name;
+	counter_attr->dev_attr.attr.mode = 0444;
+	counter_attr->dev_attr.show = counter_comp_id_show;
+
+	/* Store list node */
+	list_add(&counter_attr->l, &group->attr_list);
+	group->num_attr++;
+
+	return 0;
+}
+
 static struct counter_comp counter_signal_comp = {
 	.type = COUNTER_COMP_SIGNAL_LEVEL,
 	.name = "signal",
@@ -626,6 +666,11 @@ static int counter_sysfs_synapses_add(struct counter_device *const counter,
 					  COUNTER_SCOPE_COUNT, count);
 		if (err < 0)
 			return err;
+
+		/* Create Synapse component ID attribute */
+		err = counter_comp_id_attr_create(dev, group, comp.name, i);
+		if (err < 0)
+			return err;
 	}
 
 	return 0;
-- 
2.32.0


  parent reply	other threads:[~2021-08-27  3:49 UTC|newest]

Thread overview: 35+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-08-27  3:47 [PATCH v16 00/14] Introduce the Counter character device interface William Breathitt Gray
2021-08-27  3:47 ` [PATCH v16 01/14] counter: stm32-lptimer-cnt: Provide defines for clock polarities William Breathitt Gray
2021-08-31 13:38   ` Fabrice Gasnier
2021-09-08 17:31     ` Jonathan Cameron
2021-08-27  3:47 ` [PATCH v16 02/14] counter: stm32-timer-cnt: Provide defines for slave mode selection William Breathitt Gray
2021-08-31 13:40   ` Fabrice Gasnier
2021-09-08 17:31     ` Jonathan Cameron
2021-08-27  3:47 ` [PATCH v16 03/14] counter: Internalize sysfs interface code William Breathitt Gray
2021-08-31 13:44   ` [Linux-stm32] " Fabrice Gasnier
2021-08-31 14:16     ` William Breathitt Gray
2021-08-31 14:55       ` William Breathitt Gray
2021-09-08 17:44     ` Jonathan Cameron
2021-08-27  3:47 ` [PATCH v16 04/14] counter: Update counter.h comments to reflect sysfs internalization William Breathitt Gray
2021-09-08 17:46   ` Jonathan Cameron
2021-08-27  3:47 ` [PATCH v16 05/14] docs: counter: Update " William Breathitt Gray
2021-09-08 17:48   ` Jonathan Cameron
2021-08-27  3:47 ` [PATCH v16 06/14] counter: Move counter enums to uapi header William Breathitt Gray
2021-08-27  3:47 ` [PATCH v16 07/14] counter: Add character device interface William Breathitt Gray
2021-09-12 16:18   ` Jonathan Cameron
2021-09-20 10:09     ` William Breathitt Gray
2021-09-26 15:15       ` Jonathan Cameron
2021-09-27 10:21         ` William Breathitt Gray
2021-09-27 11:20           ` Jonathan Cameron
2021-09-27 11:33             ` William Breathitt Gray
2021-08-27  3:47 ` [PATCH v16 08/14] docs: counter: Document " William Breathitt Gray
2021-09-12 16:18   ` Jonathan Cameron
2021-08-27  3:47 ` [PATCH v16 09/14] tools/counter: Create Counter tools William Breathitt Gray
2021-09-12 16:26   ` Jonathan Cameron
2021-08-27  3:47 ` William Breathitt Gray [this message]
2021-08-27  3:47 ` [PATCH v16 11/14] counter: Implement *_component_id sysfs attributes William Breathitt Gray
2021-08-27  3:47 ` [PATCH v16 12/14] counter: Implement events_queue_size sysfs attribute William Breathitt Gray
2021-08-27  3:47 ` [PATCH v16 13/14] counter: 104-quad-8: Replace mutex with spinlock William Breathitt Gray
2021-08-27  3:47 ` [PATCH v16 14/14] counter: 104-quad-8: Add IRQ support for the ACCES 104-QUAD-8 William Breathitt Gray
2021-08-30 17:17 ` [PATCH v16 00/14] Introduce the Counter character device interface Jonathan Cameron
2021-09-12 16:36   ` Jonathan Cameron

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