diff options
Diffstat (limited to 'arch/powerpc')
| -rw-r--r-- | arch/powerpc/boot/flatdevtree.c | 65 | ||||
| -rw-r--r-- | arch/powerpc/boot/flatdevtree.h | 3 |
2 files changed, 68 insertions, 0 deletions
diff --git a/arch/powerpc/boot/flatdevtree.c b/arch/powerpc/boot/flatdevtree.c index 88b178a77e8..f6e37c2ee4d 100644 --- a/arch/powerpc/boot/flatdevtree.c +++ b/arch/powerpc/boot/flatdevtree.c @@ -820,6 +820,71 @@ int ft_get_prop(struct ft_cxt *cxt, const void *phandle, const char *propname, return -1; } +void *__ft_find_node_by_prop_value(struct ft_cxt *cxt, void *prev, + const char *propname, const char *propval, + unsigned int proplen) +{ + struct ft_atom atom; + char *p = ft_root_node(cxt); + char *next; + int past_prev = prev ? 0 : 1; + int depth = -1; + + while ((next = ft_next(cxt, p, &atom)) != NULL) { + const void *data; + unsigned int size; + + switch (atom.tag) { + case OF_DT_BEGIN_NODE: + depth++; + + if (prev == p) { + past_prev = 1; + break; + } + + if (!past_prev || depth < 1) + break; + + data = __ft_get_prop(cxt, p, propname, &size); + if (!data || size != proplen) + break; + if (memcmp(data, propval, size)) + break; + + return p; + + case OF_DT_END_NODE: + if (depth-- == 0) + return NULL; + + break; + } + + p = next; + } + + return NULL; +} + +void *ft_find_node_by_prop_value(struct ft_cxt *cxt, const void *prev, + const char *propname, const char *propval, + int proplen) +{ + void *node = NULL; + + if (prev) { + node = ft_node_ph2node(cxt, prev); + + if (!node) + return NULL; + } + + node = __ft_find_node_by_prop_value(cxt, node, propname, + propval, proplen); + return ft_get_phandle(cxt, node); +} + int ft_set_prop(struct ft_cxt *cxt, const void *phandle, const char *propname, const void *buf, const unsigned int buflen) { diff --git a/arch/powerpc/boot/flatdevtree.h b/arch/powerpc/boot/flatdevtree.h index 950042493fb..e3e3e79937f 100644 --- a/arch/powerpc/boot/flatdevtree.h +++ b/arch/powerpc/boot/flatdevtree.h @@ -105,5 +105,8 @@ int ft_get_prop(struct ft_cxt *cxt, const void *phandle, const char *propname, int ft_set_prop(struct ft_cxt *cxt, const void *phandle, const char *propname, const void *buf, const unsigned int buflen); void *ft_get_parent(struct ft_cxt *cxt, const void *phandle); +void *ft_find_node_by_prop_value(struct ft_cxt *cxt, const void *prev, + const char *propname, const char *propval, + int proplen); #endif /* FLATDEVTREE_H */ |