staging: fsl-mc: add support for the modalias sysfs attribute

In order to support uevent based module loading implement modalias support
for the fsl-mc bus driver. Aliases are based on vendor and object/device
id and are of the form "fsl-mc:vNdN".

Signed-off-by: Stuart Yoder <stuart.yoder@nxp.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

diff --git a/drivers/staging/fsl-mc/bus/mc-bus.c b/drivers/staging/fsl-mc/bus/mc-bus.c
index 4053643..d8776dd 100644 (file)
--- a/drivers/staging/fsl-mc/bus/mc-bus.c
+++ b/drivers/staging/fsl-mc/bus/mc-bus.c
@@ -82,10 +82,35 @@ static int fsl_mc_bus_uevent(struct device *dev, struct kobj_uevent_env *env)
        return 0;
 }
 
+static ssize_t modalias_show(struct device *dev, struct device_attribute *attr,
+                            char *buf)
+{
+       struct fsl_mc_device *mc_dev = to_fsl_mc_device(dev);
+
+       return sprintf(buf, "fsl-mc:v%08Xd%s\n", mc_dev->obj_desc.vendor,
+                      mc_dev->obj_desc.type);
+}
+static DEVICE_ATTR_RO(modalias);
+
+static struct attribute *fsl_mc_dev_attrs[] = {
+       &dev_attr_modalias.attr,
+       NULL,
+};
+
+static const struct attribute_group fsl_mc_dev_group = {
+       .attrs = fsl_mc_dev_attrs,
+};
+
+static const struct attribute_group *fsl_mc_dev_groups[] = {
+       &fsl_mc_dev_group,
+       NULL,
+};
+
 struct bus_type fsl_mc_bus_type = {
        .name = "fsl-mc",
        .match = fsl_mc_bus_match,
        .uevent = fsl_mc_bus_uevent,
+       .dev_groups = fsl_mc_dev_groups,
 };
 EXPORT_SYMBOL_GPL(fsl_mc_bus_type);