This introduces a platform API so busses can allow platform_data to
be attached to any struct device they create from probing in one step.
The function checks through the async platform_data map if one was
previously registered, and checks the device's device path for itself
and its parents against the mapped device path names.
If it sees a match, it attaches the associated platform_data and sets
that map entry's device_path to NULL so no further time is spent trying
to match it.
Signed-off-by: Andy Green <andy.green@xxxxxxxxxx>
---
drivers/base/platform.c | 70 +++++++++++++++++++++++++++++++++++++++
include/linux/platform_device.h | 2 +
2 files changed, 72 insertions(+), 0 deletions(-)
diff --git a/drivers/base/platform.c b/drivers/base/platform.c
index 180e372..534bf3a 100644
--- a/drivers/base/platform.c
+++ b/drivers/base/platform.c
@@ -1353,3 +1353,73 @@ void platform_async_platform_data_register(
platform_async_platform_data_count = count;
}
EXPORT_SYMBOL_GPL(platform_async_platform_data_register);
+
+/**
+ * platform_async_platform_data_attach - if there is any async devname map
+ * defined, go through it looking for a match with the
+ * device's path considering its parent device names.
+ * If a match is found, attach the corresponding
+ * platform_data and the entry in the map table set to
+ * NULL so it won't be looked for again.
+ *
+ * @dev: device to have data attched to if it matches any map entry
+ */
+void platform_async_platform_data_attach(struct device *dev)
+{
+ struct platform_async_platform_data *map;
+ const char *path;
+ int count;
+ const char *p;
+ int len;
+ struct device *devn;
+
+ map = platform_async_platform_data_map;
+ count = platform_async_platform_data_count;
+
+ while (count--) {
+
+ if (map->device_path == NULL) {
+ map++;
+ continue;
+ }
+
+ p = map->device_path + strlen(map->device_path);
+ devn = dev;
+
+ while (devn) {
+
+ path = dev_name(devn);
+ len = strlen(path);
+
+ if ((p - map->device_path) < len) {
+ devn = NULL;
+ continue;
+ }
+
+ p -= len;
+
+ if (strncmp(path, p, len)) {
+ devn = NULL;
+ continue;
+ }
+
+ devn = devn->parent;
+ if (p == map->device_path) {
+ dev_info(dev, "Attched async platform data\n");
+ dev->platform_data = map->platform_data;
+ map->device_path = NULL;
+ return;
+ }
+
+ if (devn != NULL && (p - map->device_path) < 2)
+ devn = NULL;
+
+ p--;
+ if (devn != NULL && *p != '/')
+ devn = NULL;
+ }
+
+ map++;
+ }
+}
+EXPORT_SYMBOL_GPL(platform_async_platform_data_attach);
diff --git a/include/linux/platform_device.h b/include/linux/platform_device.h
index 19ea497..4b5fa12 100644
--- a/include/linux/platform_device.h
+++ b/include/linux/platform_device.h
@@ -213,4 +213,6 @@ struct platform_async_platform_data {
extern void platform_async_platform_data_register(
struct platform_async_platform_data *map, int count);
+extern void platform_async_platform_data_attach(struct device *dev);
+
#endif /* _PLATFORM_DEVICE_H_ */
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