From 3a3439450864c8706e4e20d392fd43ecf935153f Mon Sep 17 00:00:00 2001
From: Jaroslav Kysela <perex@perex.cz>
Date: Tue, 12 Oct 2010 13:29:05 +0200
Subject: [PATCH] ucm: unify snd_use_case_geti(), add snd_use_case_card_list()
 template

Signed-off-by: Jaroslav Kysela <perex@perex.cz>
---
 include/use-case.h | 23 ++++++++++++++++++++---
 src/ucm/main.c     | 19 ++++++++++++++-----
 2 files changed, 34 insertions(+), 8 deletions(-)

diff --git a/include/use-case.h b/include/use-case.h
index dffcd346..d5ca361b 100644
--- a/include/use-case.h
+++ b/include/use-case.h
@@ -245,14 +245,16 @@ int snd_use_case_get(snd_use_case_mgr_t *uc_mgr,
  * \brief Get current - integer
  * \param uc_mgr Use case manager
  * \param identifier 
- * \return Value if success, otherwise a negative error code
+ * \param value result 
+ * \return Zero if success, otherwise a negative error code
  *
  * Known identifiers:
  *   _devstatus/<device>	- return status for given device
  *   _modstatus/<modifier>	- return status for given modifier
  */
-long snd_use_case_geti(snd_use_case_mgr_t *uc_mgr,
-                       const char *identifier);
+int snd_use_case_geti(snd_use_case_mgr_t *uc_mgr,
+		      const char *identifier,
+		      long *value);
 
 /**
  * \brief Set new
@@ -310,6 +312,21 @@ int snd_use_case_mgr_close(snd_use_case_mgr_t *uc_mgr);
  */
 int snd_use_case_mgr_reset(snd_use_case_mgr_t *uc_mgr);
 
+/*
+ * helper functions
+ */
+
+/**
+ * \brief Obtain a list of cards
+ * \param uc_mgr Use case manager (may be NULL - card list)
+ * \param list Returned allocated list
+ * \return Number of list entries if success, otherwise a negative error code
+ */
+static inline int snd_use_case_card_list(const char **list[])
+{
+	return snd_use_case_get_list(NULL, NULL, list);
+}
+
 /**
  *  \}
  */
diff --git a/src/ucm/main.c b/src/ucm/main.c
index e06e3fb7..88389764 100644
--- a/src/ucm/main.c
+++ b/src/ucm/main.c
@@ -944,8 +944,9 @@ long modifier_status(snd_use_case_mgr_t *uc_mgr,
  * \param identifier 
  * \return Value if success, otherwise a negative error code 
  */
-long snd_use_case_geti(snd_use_case_mgr_t *uc_mgr,
-                       const char *identifier)
+int snd_use_case_geti(snd_use_case_mgr_t *uc_mgr,
+		      const char *identifier,
+		      long *value)
 {
         char *str, *str1;
         long err;
@@ -964,11 +965,19 @@ long snd_use_case_geti(snd_use_case_mgr_t *uc_mgr,
                 } else {
                         str = NULL;
                 }
-                if (check_identifier(identifier, "_devstatus"))
+                if (check_identifier(identifier, "_devstatus")) {
                         err = device_status(uc_mgr, str);
-                else if (check_identifier(identifier, "_modstatus"))
+			if (err >= 0) {
+				*value = err;
+				err = 0;
+			}
+		} else if (check_identifier(identifier, "_modstatus")) {
                         err = modifier_status(uc_mgr, str);
-                else
+			if (err >= 0) {
+				*value = err;
+				err = 0;
+			}
+		} else
                         err = -EINVAL;
                 if (str)
                         free(str);
-- 
2.11.0