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counter: Implement signalZ_action_component_id sysfs attribute

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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>
This commit is contained in:
William Breathitt Gray 2021-09-29 12:16:02 +09:00 committed by Jonathan Cameron
parent 086099893f
commit bb6264a61d
2 changed files with 52 additions and 0 deletions
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7
Documentation/ABI/testing/sysfs-bus-counter
View File

@ -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

45
drivers/counter/counter-sysfs.c
View File

@ -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;