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mei: export fw status registers through sysfs 

The interface is for applications that monitor
the fw health.

We use device_create_with_groups interface
to register attribute with the mei class device

Signed-off-by: Tomas Winkler <tomas.winkler@intel.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
hifive-unleashed-5.1
Tomas Winkler 2014-11-19 17:01:39 +02:00 committed by Greg Kroah-Hartman
parent edca5ea3ff
commit 55c4e6405d
1 changed files with 41 additions and 2 deletions
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43
drivers/misc/mei/main.c
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@ -631,6 +631,44 @@ out:
return mask;
}
/**
* fw_status_show - mei device attribute show method
*
* @device: device pointer
* @attr: attribute pointer
* @buf: char out buffer
*
* Return: number of the bytes printed into buf or error
*/
static ssize_t fw_status_show(struct device *device,
struct device_attribute *attr, char *buf)
{
struct mei_device *dev = dev_get_drvdata(device);
struct mei_fw_status fw_status;
int err, i;
ssize_t cnt = 0;
mutex_lock(&dev->device_lock);
err = mei_fw_status(dev, &fw_status);
mutex_unlock(&dev->device_lock);
if (err) {
dev_err(device, "read fw_status error = %d\n", err);
return err;
}
for (i = 0; i < fw_status.count; i++)
cnt += scnprintf(buf + cnt, PAGE_SIZE - cnt, "%08X\n",
fw_status.status[i]);
return cnt;
}
static DEVICE_ATTR_RO(fw_status);
static struct attribute *mei_attrs[] = {
&dev_attr_fw_status.attr,
NULL
};
ATTRIBUTE_GROUPS(mei);
/*
* file operations structure will be used for mei char device.
*/
@ -710,8 +748,9 @@ int mei_register(struct mei_device *dev, struct device *parent)
goto err_dev_add;
}
clsdev = device_create(mei_class, parent, devno,
NULL, "mei%d", dev->minor);
clsdev = device_create_with_groups(mei_class, parent, devno,
dev, mei_groups,
"mei%d", dev->minor);
if (IS_ERR(clsdev)) {
dev_err(parent, "unable to create device %d:%d\n",