Donate to e Foundation | Murena handsets with /e/OS | Own a part of Murena! Learn more

Commit 55c4e640 authored by Tomas Winkler's avatar Tomas Winkler Committed by Greg Kroah-Hartman
Browse files

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: default avatarTomas Winkler <tomas.winkler@intel.com>
Signed-off-by: default avatarGreg Kroah-Hartman <gregkh@linuxfoundation.org>
parent edca5ea3

drivers/misc/mei/main.c

+41 −2
Original line number Diff line number Diff line
@@ -631,6 +631,44 @@ static unsigned int mei_poll(struct file *file, poll_table *wait) 
	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",