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Subject[char-misc-next 2/3] mei: adding sysfs fw_status attribute
Date
Export fw status register through sysfs interface.
The interface is for applications that monitors
fw health.

Signed-off-by: Natalia Ovsyanikov <natalia.ovsyanikov@intel.com>
Signed-off-by: Tomas Winkler <tomas.winkler@intel.com>
---
drivers/misc/mei/main.c | 54 ++++++++++++++++++++++++++++++++++++++++++++++---
1 file changed, 51 insertions(+), 3 deletions(-)

diff --git a/drivers/misc/mei/main.c b/drivers/misc/mei/main.c
index 173ff09..64e36a8 100644
--- a/drivers/misc/mei/main.c
+++ b/drivers/misc/mei/main.c
@@ -659,6 +659,44 @@ out:
return mask;
}

+/**
+ * mei_show_fw_status - mei device attribute show method
+ *
+ * @dev: device pointer
+ * @attr: attribute pointer
+ * @buf: char out buffer
+ *
+ * returns number of the bytes, printed into the buffer
+ */
+
+static ssize_t mei_show_fw_status(struct device *device,
+ struct device_attribute *attr, char *buf)
+{
+ struct mei_device *dev = dev_get_drvdata(device);
+ u32 fw_status;
+ int err;
+
+ mutex_lock(&dev->device_lock);
+ err = mei_fw_status(dev, &fw_status);
+ mutex_unlock(&dev->device_lock);
+ if (err) {
+ dev_err(device, "attribute show: read fw_status error = %d\n",
+ err);
+ return err;
+ }
+
+ dev_dbg(device, "attribute show: fw_status 0x%x\n", fw_status);
+ return sprintf(buf, "%08X\n", fw_status);
+}
+static DEVICE_ATTR(fw_status, S_IRUGO, mei_show_fw_status, NULL);
+static struct attribute *mei_attributes[] = {
+ &dev_attr_fw_status.attr,
+ NULL
+};
+static const struct attribute_group mei_attr_group = {
+ .attrs = mei_attributes,
+};
+
/*
* file operations structure will be used for mei char device.
*/
@@ -685,17 +723,22 @@ static struct miscdevice mei_misc_device = {
.minor = MISC_DYNAMIC_MINOR,
};

-
int mei_register(struct mei_device *dev)
{
+ struct device *device = &dev->pdev->dev;
int ret;
- mei_misc_device.parent = &dev->pdev->dev;
+
+ mei_misc_device.parent = device;
ret = misc_register(&mei_misc_device);
if (ret)
return ret;

+ ret = sysfs_create_group(&device->kobj, &mei_attr_group);
+ if (ret)
+ return ret;
+
if (mei_dbgfs_register(dev, mei_misc_device.name))
- dev_err(&dev->pdev->dev, "cannot register debugfs\n");
+ dev_err(device, "cannot register debugfs\n");

return 0;
}
@@ -703,7 +746,12 @@ EXPORT_SYMBOL_GPL(mei_register);

void mei_deregister(struct mei_device *dev)
{
+ struct device *device = &dev->pdev->dev;
+
+ sysfs_remove_group(&device->kobj, &mei_attr_group);
+
mei_dbgfs_deregister(dev);
+
misc_deregister(&mei_misc_device);
mei_misc_device.parent = NULL;
}
--
1.8.1.2


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