[POWERPC] Move of_device_get_modalias to drivers/of

[linux-2.6-omap-h63xx.git] / drivers / of / device.c

diff --git a/drivers/of/device.c b/drivers/of/device.c
index 8fbfeee53c1e30841e9558c61fb04202bbf1688b..8a1d93a2bb815c380bb18710369912834c2d2f06 100644 (file)
--- a/drivers/of/device.c
+++ b/drivers/of/device.c
@@ -104,3 +104,51 @@ void of_device_unregister(struct of_device *ofdev)
        device_unregister(&ofdev->dev);
 }
 EXPORT_SYMBOL(of_device_unregister);
+
+ssize_t of_device_get_modalias(struct of_device *ofdev,
+                               char *str, ssize_t len)
+{
+       const char *compat;
+       int cplen, i;
+       ssize_t tsize, csize, repend;
+
+       /* Name & Type */
+       csize = snprintf(str, len, "of:N%sT%s",
+                               ofdev->node->name, ofdev->node->type);
+
+       /* Get compatible property if any */
+       compat = of_get_property(ofdev->node, "compatible", &cplen);
+       if (!compat)
+               return csize;
+
+       /* Find true end (we tolerate multiple \0 at the end */
+       for (i = (cplen - 1); i >= 0 && !compat[i]; i--)
+               cplen--;
+       if (!cplen)
+               return csize;
+       cplen++;
+
+       /* Check space (need cplen+1 chars including final \0) */
+       tsize = csize + cplen;
+       repend = tsize;
+
+       if (csize >= len)               /* @ the limit, all is already filled */
+               return tsize;
+
+       if (tsize >= len) {             /* limit compat list */
+               cplen = len - csize - 1;
+               repend = len;
+       }
+
+       /* Copy and do char replacement */
+       memcpy(&str[csize + 1], compat, cplen);
+       for (i = csize; i < repend; i++) {
+               char c = str[i];
+               if (c == '\0')
+                       str[i] = 'C';
+               else if (c == ' ')
+                       str[i] = '_';
+       }
+
+       return tsize;
+}