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-rw-r--r--src/barebox-state/state.c161
1 files changed, 161 insertions, 0 deletions
diff --git a/src/barebox-state/state.c b/src/barebox-state/state.c
index e907290..804ac6c 100644
--- a/src/barebox-state/state.c
+++ b/src/barebox-state/state.c
@@ -33,6 +33,167 @@
/* list of all registered state instances */
static LIST_HEAD(state_list);
+/**
+ * Save the state
+ * @param state
+ * @return
+ */
+int state_save(struct state *state)
+{
+ uint8_t *buf;
+ ssize_t len;
+ int ret;
+
+ if (!state->dirty)
+ return 0;
+
+ ret = state->format->pack(state->format, state, &buf, &len);
+ if (ret) {
+ dev_err(&state->dev, "Failed to pack state with backend format %s, %d\n",
+ state->format->name, ret);
+ return ret;
+ }
+
+ ret = state_storage_write(&state->storage, buf, len);
+ if (ret) {
+ dev_err(&state->dev, "Failed to write packed state, %d\n", ret);
+ goto out;
+ }
+
+ state->dirty = 0;
+
+out:
+ free(buf);
+ return ret;
+}
+
+/**
+ * state_load - Loads a state from the backend
+ * @param state The state that should be updated to contain the loaded data
+ * @return 0 on success, -errno on failure. If no state is loaded the previous
+ * values remain in the state.
+ *
+ * This function uses the registered storage backend to read data. All data that
+ * we read is checked for integrity by the formatter. After that we unpack the
+ * data into our state.
+ */
+int state_load(struct state *state)
+{
+ uint8_t *buf;
+ ssize_t len;
+ int ret;
+
+ ret = state_storage_read(&state->storage, state->format,
+ state->magic, &buf, &len);
+ if (ret) {
+ dev_err(&state->dev, "Failed to read state with format %s, %d\n",
+ state->format->name, ret);
+ return ret;
+ }
+
+ ret = state->format->unpack(state->format, state, buf, len);
+ if (ret) {
+ dev_err(&state->dev, "Failed to unpack read data with format %s although verified, %d\n",
+ state->format->name, ret);
+ goto out;
+ }
+
+ state->dirty = 0;
+
+out:
+ free(buf);
+ return ret;
+}
+
+static int state_format_init(struct state *state,
+ struct device_d *dev, const char *backend_format,
+ struct device_node *node, const char *state_name)
+{
+ int ret;
+
+ if (!backend_format || !strcmp(backend_format, "raw")) {
+ ret = backend_format_raw_create(&state->format, node,
+ state_name, dev);
+ } else if (!strcmp(backend_format, "dtb")) {
+ ret = backend_format_dtb_create(&state->format, dev);
+ } else {
+ dev_err(dev, "Invalid backend format %s\n",
+ backend_format);
+ return -EINVAL;
+ }
+
+ if (ret && ret != -EPROBE_DEFER)
+ dev_err(dev, "Failed to initialize format %s, %d\n",
+ backend_format, ret);
+
+ return ret;
+}
+
+static void state_format_free(struct state_backend_format *format)
+{
+ if (format->free)
+ format->free(format);
+}
+
+/**
+ * state_backend_init - Initiates the backend storage and format using the
+ * passed arguments
+ * @param backend state backend
+ * @param dev Device pointer used for prints
+ * @param node the DT device node corresponding to the state
+ * @param backend_format a string describing the format. Valid values are 'raw'
+ * and 'dtb' currently
+ * @param storage_path Path to the backend storage file/device/partition/...
+ * @param state_name Name of the state
+ * @param of_path Path in the devicetree
+ * @param stridesize stridesize in case we have a medium without eraseblocks.
+ * stridesize describes how far apart copies of the same data should be stored.
+ * For blockdevices it makes sense to align them on blocksize.
+ * @param storagetype Type of the storage backend. This may be NULL where we
+ * autoselect some backwardscompatible backend options
+ * @return 0 on success, -errno otherwise
+ */
+static int state_backend_init(struct state *state, struct device_d *dev,
+ struct device_node *node, const char *backend_format,
+ const char *storage_path, const char *state_name, const
+ char *of_path, off_t offset, size_t max_size,
+ uint32_t stridesize, const char *storagetype)
+{
+ int ret;
+
+ ret = state_format_init(state, dev, backend_format, node, state_name);
+ if (ret)
+ return ret;
+
+ ret = state_storage_init(&state->storage, dev, storage_path, offset,
+ max_size, stridesize, storagetype);
+ if (ret)
+ goto out_free_format;
+
+ state->of_backend_path = xstrdup(of_path);
+
+ return 0;
+
+out_free_format:
+ state_format_free(state->format);
+ state->format = NULL;
+
+ return ret;
+}
+
+void state_backend_set_readonly(struct state *state)
+{
+ state_storage_set_readonly(&state->storage);
+}
+
+void state_backend_free(struct state *state)
+{
+ state_storage_free(&state->storage);
+ if (state->format)
+ state_format_free(state->format);
+ free(state->of_path);
+}
+
static struct state *state_new(const char *name)
{
struct state *state;