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mei: bus: add more client attributes to sysfs 

Export more client attributes via sysfs that are usually obtained
upon connection. In some cases, for example a monitoring application
may wish to know the attributes without actually performing the connection.
Added attributes:
max number of connections, fixed address, max message length.

Signed-off-by: Alexander Usyskin <alexander.usyskin@intel.com>
Signed-off-by: Tomas Winkler <tomas.winkler@intel.com>
Link: https://lore.kernel.org/r/20191116142136.17535-1-tomas.winkler@intel.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Alexander Usyskin 2019-11-16 16:21:36 +02:00 committed by Greg Kroah-Hartman
parent 87ff16007c
commit 64498695dd
3 changed files with 90 additions and 0 deletions
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21
Documentation/ABI/testing/sysfs-bus-mei
View File

@ -26,3 +26,24 @@ KernelVersion: 4.3
Contact: Tomas Winkler <tomas.winkler@intel.com>
Description: Stores mei client protocol version
Format: %d
What: /sys/bus/mei/devices/.../max_conn
Date: Nov 2019
KernelVersion: 5.5
Contact: Tomas Winkler <tomas.winkler@intel.com>
Description: Stores mei client maximum number of connections
Format: %d
What: /sys/bus/mei/devices/.../fixed
Date: Nov 2019
KernelVersion: 5.5
Contact: Tomas Winkler <tomas.winkler@intel.com>
Description: Stores mei client fixed address, if any
Format: %d
What: /sys/bus/mei/devices/.../max_len
Date: Nov 2019
KernelVersion: 5.5
Contact: Tomas Winkler <tomas.winkler@intel.com>
Description: Stores mei client maximum message length
Format: %d

33
drivers/misc/mei/bus.c
View File

@ -791,11 +791,44 @@ static ssize_t modalias_show(struct device *dev, struct device_attribute *a,
}
static DEVICE_ATTR_RO(modalias);
static ssize_t max_conn_show(struct device *dev, struct device_attribute *a,
char *buf)
{
struct mei_cl_device *cldev = to_mei_cl_device(dev);
u8 maxconn = mei_me_cl_max_conn(cldev->me_cl);
return scnprintf(buf, PAGE_SIZE, "%d", maxconn);
}
static DEVICE_ATTR_RO(max_conn);
static ssize_t fixed_show(struct device *dev, struct device_attribute *a,
char *buf)
{
struct mei_cl_device *cldev = to_mei_cl_device(dev);
u8 fixed = mei_me_cl_fixed(cldev->me_cl);
return scnprintf(buf, PAGE_SIZE, "%d", fixed);
}
static DEVICE_ATTR_RO(fixed);
static ssize_t max_len_show(struct device *dev, struct device_attribute *a,
char *buf)
{
struct mei_cl_device *cldev = to_mei_cl_device(dev);
u32 maxlen = mei_me_cl_max_len(cldev->me_cl);
return scnprintf(buf, PAGE_SIZE, "%u", maxlen);
}
static DEVICE_ATTR_RO(max_len);
static struct attribute *mei_cldev_attrs[] = {
&dev_attr_name.attr,
&dev_attr_uuid.attr,
&dev_attr_version.attr,
&dev_attr_modalias.attr,
&dev_attr_max_conn.attr,
&dev_attr_fixed.attr,
&dev_attr_max_len.attr,
NULL,
};
ATTRIBUTE_GROUPS(mei_cldev);

36
drivers/misc/mei/client.h
View File

@ -69,6 +69,42 @@ static inline u8 mei_me_cl_ver(const struct mei_me_client *me_cl)
return me_cl->props.protocol_version;
}
/**
* mei_me_cl_max_conn - return me client max number of connections
*
* @me_cl: me client
*
* Return: me client max number of connections
*/
static inline u8 mei_me_cl_max_conn(const struct mei_me_client *me_cl)
{
return me_cl->props.max_number_of_connections;
}
/**
* mei_me_cl_fixed - return me client fixed address, if any
*
* @me_cl: me client
*
* Return: me client fixed address
*/
static inline u8 mei_me_cl_fixed(const struct mei_me_client *me_cl)
{
return me_cl->props.fixed_address;
}
/**
* mei_me_cl_max_len - return me client max msg length
*
* @me_cl: me client
*
* Return: me client max msg length
*/
static inline u32 mei_me_cl_max_len(const struct mei_me_client *me_cl)
{
return me_cl->props.max_msg_length;
}
/*
* MEI IO Functions
*/