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authorWilliam Breathitt Gray <vilhelm.gray@gmail.com>2021-09-29 06:16:02 +0300
committerJonathan Cameron <Jonathan.Cameron@huawei.com>2021-10-17 12:54:36 +0300
commitbb6264a61de84320e77a22b4b8f4babf240608c4 (patch)
treee3f7f131dedc87caf58ab4498137ea94fde306d9 /drivers/counter
parent086099893fcebeae50f9020588080de43c82e4c0 (diff)
downloadlinux-bb6264a61de84320e77a22b4b8f4babf240608c4.tar.xz
counter: Implement signalZ_action_component_id sysfs attribute
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> Link: https://lore.kernel.org/r/a6c81b2f1f5d0b8d59b1ebe4f0fed04914b07547.1632884256.git.vilhelm.gray@gmail.com Signed-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>
Diffstat (limited to 'drivers/counter')
-rw-r--r--drivers/counter/counter-sysfs.c45
1 files changed, 45 insertions, 0 deletions
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;