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authorGrant Likely <grant.likely@secretlab.ca>2011-12-12 09:25:58 -0700
committerGrant Likely <grant.likely@secretlab.ca>2012-01-28 10:29:20 -0700
commit7aff0fe33033fc75b61446ba29d38b1b1354af9f (patch)
tree2ddcfaf17ab0d98959478fd5133d1fe08adb8eef /drivers/of
parentdcd6c92267155e70a94b3927bce681ce74b80d1f (diff)
downloadlinux-7aff0fe33033fc75b61446ba29d38b1b1354af9f.tar.bz2
of: Add of_property_match_string() to find index into a string list
Add a helper function for finding the index of a string in a string list property. This helper is useful for bindings that use a separate *-name property for attaching names to tuples in another property such as 'reg' or 'gpios'. Signed-off-by: Grant Likely <grant.likely@secretlab.ca>
Diffstat (limited to 'drivers/of')
-rw-r--r--drivers/of/base.c36
-rw-r--r--drivers/of/selftest.c29
2 files changed, 65 insertions, 0 deletions
diff --git a/drivers/of/base.c b/drivers/of/base.c
index 133908a6fd8d..13ba72875e25 100644
--- a/drivers/of/base.c
+++ b/drivers/of/base.c
@@ -761,6 +761,42 @@ int of_property_read_string_index(struct device_node *np, const char *propname,
}
EXPORT_SYMBOL_GPL(of_property_read_string_index);
+/**
+ * of_property_match_string() - Find string in a list and return index
+ * @np: pointer to node containing string list property
+ * @propname: string list property name
+ * @string: pointer to string to search for in string list
+ *
+ * This function searches a string list property and returns the index
+ * of a specific string value.
+ */
+int of_property_match_string(struct device_node *np, const char *propname,
+ const char *string)
+{
+ struct property *prop = of_find_property(np, propname, NULL);
+ size_t l;
+ int i;
+ const char *p, *end;
+
+ if (!prop)
+ return -EINVAL;
+ if (!prop->value)
+ return -ENODATA;
+
+ p = prop->value;
+ end = p + prop->length;
+
+ for (i = 0; p < end; i++, p += l) {
+ l = strlen(p) + 1;
+ if (p + l > end)
+ return -EILSEQ;
+ pr_debug("comparing %s with %s\n", string, p);
+ if (strcmp(string, p) == 0)
+ return i; /* Found it; return index */
+ }
+ return -ENODATA;
+}
+EXPORT_SYMBOL_GPL(of_property_match_string);
/**
* of_property_count_strings - Find and return the number of strings from a
diff --git a/drivers/of/selftest.c b/drivers/of/selftest.c
index 9d2b4803a9d6..f24ffd7088d2 100644
--- a/drivers/of/selftest.c
+++ b/drivers/of/selftest.c
@@ -120,6 +120,34 @@ static void __init of_selftest_parse_phandle_with_args(void)
pr_info("end - %s\n", passed_all ? "PASS" : "FAIL");
}
+static void __init of_selftest_property_match_string(void)
+{
+ struct device_node *np;
+ int rc;
+
+ pr_info("start\n");
+ np = of_find_node_by_path("/testcase-data/phandle-tests/consumer-a");
+ if (!np) {
+ pr_err("No testcase data in device tree\n");
+ return;
+ }
+
+ rc = of_property_match_string(np, "phandle-list-names", "first");
+ selftest(rc == 0, "first expected:0 got:%i\n", rc);
+ rc = of_property_match_string(np, "phandle-list-names", "second");
+ selftest(rc == 1, "second expected:0 got:%i\n", rc);
+ rc = of_property_match_string(np, "phandle-list-names", "third");
+ selftest(rc == 2, "third expected:0 got:%i\n", rc);
+ rc = of_property_match_string(np, "phandle-list-names", "fourth");
+ selftest(rc == -ENODATA, "unmatched string; rc=%i", rc);
+ rc = of_property_match_string(np, "missing-property", "blah");
+ selftest(rc == -EINVAL, "missing property; rc=%i", rc);
+ rc = of_property_match_string(np, "empty-property", "blah");
+ selftest(rc == -ENODATA, "empty property; rc=%i", rc);
+ rc = of_property_match_string(np, "unterminated-string", "blah");
+ selftest(rc == -EILSEQ, "unterminated string; rc=%i", rc);
+}
+
static int __init of_selftest(void)
{
struct device_node *np;
@@ -133,6 +161,7 @@ static int __init of_selftest(void)
pr_info("start of selftest - you will see error messages\n");
of_selftest_parse_phandle_with_args();
+ of_selftest_property_match_string();
pr_info("end of selftest - %s\n", selftest_passed ? "PASS" : "FAIL");
return 0;
}