[PATCH] Add modalias to macio sysfs attributes

Provide a "compatible" entry in /sys/bus/macio/devices/*/ This can be used
to load drivers via the modules.alias file.

Signed-off-by: Olaf Hering <olh@suse.de>
Acked-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Paul Mackerras <paulus@samba.org>

1 files changed, 26 insertions, 0 deletions

diff --git a/drivers/macintosh/macio_sysfs.c b/drivers/macintosh/macio_sysfs.c
index 97d22bb4516a..7f7d4eaca870 100644
--- a/drivers/macintosh/macio_sysfs.c
+++ b/drivers/macintosh/macio_sysfs.c
@@ -39,6 +39,31 @@ compatible_show (struct device *dev, struct device_attribute *attr, char *buf)
         return length;
 }
 
+static ssize_t modalias_show (struct device *dev, struct device_attribute *attr,
+                              char *buf)
+{
+        struct of_device *of;
+        char *compat;
+        int cplen;
+        int length;
+
+        of = &to_macio_device (dev)->ofdev;
+        compat = (char *) get_property (of->node, "compatible", &cplen);
+        if (!compat) compat = "", cplen = 1;
+        length = sprintf (buf, "of:N%sT%s", of->node->name, of->node->type);
+        buf += length;
+        while (cplen > 0) {
+                int l;
+                length += sprintf (buf, "C%s", compat);
+                buf += length;
+                l = strlen (compat) + 1;
+                compat += l;
+                cplen -= l;
+        }
+
+        return length;
+}
+
 macio_config_of_attr (name, "%s\n");
 macio_config_of_attr (type, "%s\n");
 
@@ -46,5 +71,6 @@ struct device_attribute macio_dev_attrs[] = {
         __ATTR_RO(name),
         __ATTR_RO(type),
         __ATTR_RO(compatible),
+        __ATTR_RO(modalias),
         __ATTR_NULL
 };