linux-kernel - [char-misc-next 06/11] mei: bus: add name and uuid into device attributes

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Date:	Thu,  7 May 2015 15:54:03 +0300
From:	Tomas Winkler <tomas.winkler@...el.com>
To:	gregkh@...uxfoundation.org
Cc:	arnd@...db.de, linux-kernel@...r.kernel.org,
	Tomas Winkler <tomas.winkler@...el.com>,
	linux-api@...r.kernel.org
Subject: [char-misc-next 06/11] mei: bus: add name and uuid into device attributes

Export name and uuid via sysfs and uevent

Cc: linux-api@...r.kernel.org
Signed-off-by: Tomas Winkler <tomas.winkler@...el.com>
---
 Documentation/ABI/testing/sysfs-bus-mei | 14 ++++++++++++++
 drivers/misc/mei/bus.c                  | 33 +++++++++++++++++++++++++++++++++
 2 files changed, 47 insertions(+)

diff --git a/Documentation/ABI/testing/sysfs-bus-mei b/Documentation/ABI/testing/sysfs-bus-mei
index 91967a70313a..20e4d1638bac 100644
--- a/Documentation/ABI/testing/sysfs-bus-mei
+++ b/Documentation/ABI/testing/sysfs-bus-mei
@@ -5,3 +5,17 @@ Contact:	Samuel Ortiz <sameo@...ux.intel.com>
 		linux-mei@...ux.intel.com
 Description:	Stores the same MODALIAS value emitted by uevent
 		Format: mei:<mei device name>:<device uuid>:
+
+What:		/sys/bus/mei/devices/.../name
+Date:		May 2015
+KernelVersion:	4.2
+Contact:	Tomas Winkler <tomas.winkler@...el.com>
+Description:	Stores mei client device name
+		Format: string
+
+What:		/sys/bus/mei/devices/.../uuid
+Date:		May 2015
+KernelVersion:	4.2
+Contact:	Tomas Winkler <tomas.winkler@...el.com>
+Description:	Stores mei client device uuid
+		Format: xxxxxxxx-xxxx-xxxx-xxxx-xxxxxxxxxxxx
diff --git a/drivers/misc/mei/bus.c b/drivers/misc/mei/bus.c
index 17b00baa53b1..e76d94aa6e12 100644
--- a/drivers/misc/mei/bus.c
+++ b/drivers/misc/mei/bus.c
@@ -114,6 +114,31 @@ static int mei_cl_device_remove(struct device *dev)
 	return driver->remove(device);
 }
 
+static ssize_t name_show(struct device *dev, struct device_attribute *a,
+			     char *buf)
+{
+	struct mei_cl_device *device = to_mei_cl_device(dev);
+	size_t len;
+
+	len = snprintf(buf, PAGE_SIZE, "%s", device->name);
+
+	return (len >= PAGE_SIZE) ? (PAGE_SIZE - 1) : len;
+}
+static DEVICE_ATTR_RO(name);
+
+static ssize_t uuid_show(struct device *dev, struct device_attribute *a,
+			     char *buf)
+{
+	struct mei_cl_device *device = to_mei_cl_device(dev);
+	const uuid_le *uuid = mei_me_cl_uuid(device->me_cl);
+	size_t len;
+
+	len = snprintf(buf, PAGE_SIZE, "%pUl", uuid);
+
+	return (len >= PAGE_SIZE) ? (PAGE_SIZE - 1) : len;
+}
+static DEVICE_ATTR_RO(uuid);
+
 static ssize_t modalias_show(struct device *dev, struct device_attribute *a,
 			     char *buf)
 {
@@ -129,6 +154,8 @@ static ssize_t modalias_show(struct device *dev, struct device_attribute *a,
 static DEVICE_ATTR_RO(modalias);
 
 static struct attribute *mei_cl_dev_attrs[] = {
+	&dev_attr_name.attr,
+	&dev_attr_uuid.attr,
 	&dev_attr_modalias.attr,
 	NULL,
 };
@@ -139,6 +166,12 @@ static int mei_cl_uevent(struct device *dev, struct kobj_uevent_env *env)
 	struct mei_cl_device *device = to_mei_cl_device(dev);
 	const uuid_le *uuid = mei_me_cl_uuid(device->me_cl);
 
+	if (add_uevent_var(env, "MEI_CL_UUID=%pUl", uuid))
+		return -ENOMEM;
+
+	if (add_uevent_var(env, "MEI_CL_NAME=%s", device->name))
+		return -ENOMEM;
+
 	if (add_uevent_var(env, "MODALIAS=mei:%s:" MEI_CL_UUID_FMT ":",
 		device->name, MEI_CL_UUID_ARGS(uuid->b)))
 		return -ENOMEM;
-- 
2.1.0

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