Staging: ipack: Expose modalias through sysfs.

Also include it in the hotplug event so that udev can
provide the respective driver.

Signed-off-by: Jens Taprogge <jens.taprogge@taprogge.org>
Signed-off-by: Samuel Iglesias Gonsálvez <siglesias@igalia.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

diff --git a/drivers/staging/ipack/ipack.c b/drivers/staging/ipack/ipack.c
index a328629..a5ef28f 100644 (file)
--- a/drivers/staging/ipack/ipack.c
+++ b/drivers/staging/ipack/ipack.c
@@ -86,6 +86,31 @@ static int ipack_bus_remove(struct device *device)
        return 0;
 }
 
+#ifdef CONFIG_HOTPLUG
+
+static int ipack_uevent(struct device *dev, struct kobj_uevent_env *env)
+{
+       struct ipack_device *idev;
+
+       if (!dev)
+               return -ENODEV;
+
+       idev = to_ipack_dev(dev);
+
+       if (add_uevent_var(env,
+                          "MODALIAS=ipack:f%02Xv%08Xd%08X", idev->id_format,
+                          idev->id_vendor, idev->id_device))
+               return -ENOMEM;
+
+       return 0;
+}
+
+#else /* !CONFIG_HOTPLUG */
+
+#define ipack_uevent NULL
+
+#endif /* !CONFIG_HOTPLUG */
+
 #define ipack_device_attr(field, format_string)                                \
 static ssize_t                                                         \
 field##_show(struct device *dev, struct device_attribute *attr,                \
@@ -123,12 +148,22 @@ id_device_show(struct device *dev, struct device_attribute *attr, char *buf)
        }
 }
 
+static ssize_t modalias_show(struct device *dev, struct device_attribute *attr,
+                            char *buf)
+{
+       struct ipack_device *idev = to_ipack_dev(dev);
+
+       return sprintf(buf, "ipac:f%02Xv%08Xd%08X", idev->id_format,
+                      idev->id_vendor, idev->id_device);
+}
+
 ipack_device_attr(id_format, "0x%hhu\n");
 
 static struct device_attribute ipack_dev_attrs[] = {
        __ATTR_RO(id_device),
        __ATTR_RO(id_format),
        __ATTR_RO(id_vendor),
+       __ATTR_RO(modalias),
 };
 
 static struct bus_type ipack_bus_type = {
@@ -137,6 +172,7 @@ static struct bus_type ipack_bus_type = {
        .match     = ipack_bus_match,
        .remove    = ipack_bus_remove,
        .dev_attrs = ipack_dev_attrs,
+       .uevent    = ipack_uevent,
 };
 
 struct ipack_bus_device *ipack_bus_register(struct device *parent, int slots,