From 55c4e6405d434e2db1e3fb3618b84741bb17d862 Mon Sep 17 00:00:00 2001 From: Tomas Winkler Date: Wed, 19 Nov 2014 17:01:39 +0200 Subject: [PATCH] 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 Signed-off-by: Greg Kroah-Hartman --- drivers/misc/mei/main.c | 43 +++++++++++++++++++++++++++++++++++++++++-- 1 file changed, 41 insertions(+), 2 deletions(-) diff --git a/drivers/misc/mei/main.c b/drivers/misc/mei/main.c index beedc91f03a6..ae56ba6ca0e3 100644 --- a/drivers/misc/mei/main.c +++ b/drivers/misc/mei/main.c @@ -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", -- 2.11.0