topology: Add text section parser.

Parse text lists (like enum values) and store for later attachment
to other objects.

Signed-off-by: Liam Girdwood <liam.r.girdwood@linux.intel.com>
Signed-off-by: Takashi Iwai <tiwai@suse.de>

src/topology/text.c

@@ -0,0 +1,88 @@
+/*
+  Copyright(c) 2014-2015 Intel Corporation
+  All rights reserved.
+
+  This program is free software; you can redistribute it and/or modify
+  it under the terms of version 2 of the GNU General Public License as
+  published by the Free Software Foundation.
+
+  This program is distributed in the hope that it will be useful, but
+  WITHOUT ANY WARRANTY; without even the implied warranty of
+  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+  General Public License for more details.
+
+  Authors: Mengdong Lin <mengdong.lin@intel.com>
+           Yao Jin <yao.jin@intel.com>
+           Liam Girdwood <liam.r.girdwood@linux.intel.com>
+
+*/
+
+#include "list.h"
+#include "tplg_local.h"
+
+#define TEXT_SIZE_MAX \
+	(SND_SOC_TPLG_NUM_TEXTS * SNDRV_CTL_ELEM_ID_NAME_MAXLEN)
+
+static int parse_text_values(snd_config_t *cfg, struct tplg_elem *elem)
+{
+	snd_config_iterator_t i, next;
+	snd_config_t *n;
+	const char *value = NULL;
+	int j = 0;
+
+	tplg_dbg(" Text Values: %s\n", elem->id);
+
+	snd_config_for_each(i, next, cfg) {
+		n = snd_config_iterator_entry(i);
+
+		if (j == SND_SOC_TPLG_NUM_TEXTS) {
+			tplg_dbg("error: text string number exceeds %d\n", j);
+			return -ENOMEM;
+		}
+
+		/* get value */
+		if (snd_config_get_string(n, &value) < 0)
+			continue;
+
+		elem_copy_text(&elem->texts[j][0], value,
+			SNDRV_CTL_ELEM_ID_NAME_MAXLEN);
+		tplg_dbg("\t%s\n", &elem->texts[j][0]);
+
+		j++;
+	}
+
+	return 0;
+}
+
+/* Parse Text data */
+int tplg_parse_text(snd_tplg_t *tplg, snd_config_t *cfg,
+	void *private ATTRIBUTE_UNUSED)
+{
+	snd_config_iterator_t i, next;
+	snd_config_t *n;
+	const char *id;
+	int err = 0;
+	struct tplg_elem *elem;
+
+	elem = tplg_elem_new_common(tplg, cfg, OBJECT_TYPE_TEXT);
+	if (!elem)
+		return -ENOMEM;
+
+	snd_config_for_each(i, next, cfg) {
+
+		n = snd_config_iterator_entry(i);
+		if (snd_config_get_id(n, &id) < 0)
+			continue;
+
+		if (strcmp(id, "values") == 0) {
+			err = parse_text_values(n, elem);
+			if (err < 0) {
+				SNDERR("error: failed to parse text values");
+				return err;
+			}
+			continue;
+		}
+	}
+
+	return err;
+}