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greybus: connection: Add sysfs 'ap_cport_id' file for connections

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Its a very useful piece of information, i.e. the cport id of the AP to
which the cport of the module is connected, and is required lots of
times. It isn't known in advance as it is allocated at runtime.

This patch creates another file 'ap_cport_id', only for the connection
directories, which will give the cport id of the AP.

Signed-off-by: Viresh Kumar <viresh.kumar@linaro.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@google.com>
This commit is contained in:
Viresh Kumar 2015-09-07 17:56:58 +05:30 committed by Greg Kroah-Hartman
parent 0a020570ed
commit 8552ca0f36
2 changed files with 17 additions and 0 deletions
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8
drivers/staging/greybus/Documentation/sysfs-bus-greybus
View File

@ -126,6 +126,14 @@ Description:
3 - error
4 - destroying
What: /sys/bus/greybus/device/.../ap_cport_id
Date: October 2015
KernelVersion: 4.XX
Contact: Greg Kroah-Hartman <greg@kroah.com>
Description:
The cport ID of the AP, to which cport of the module is
connected.
What: /sys/bus/greybus/device/.../protocol_id
Date: October 2015
KernelVersion: 4.XX

9
drivers/staging/greybus/connection.c
View File

@ -116,9 +116,18 @@ protocol_id_show(struct device *dev, struct device_attribute *attr, char *buf)
}
static DEVICE_ATTR_RO(protocol_id);
static ssize_t
ap_cport_id_show(struct device *dev, struct device_attribute *attr, char *buf)
{
struct gb_connection *connection = to_gb_connection(dev);
return sprintf(buf, "%hu\n", connection->hd_cport_id);
}
static DEVICE_ATTR_RO(ap_cport_id);
static struct attribute *connection_attrs[] = {
&dev_attr_state.attr,
&dev_attr_protocol_id.attr,
&dev_attr_ap_cport_id.attr,
NULL,
};