Added const specifier for several mixer functions

Functions changed are:
 - mixer_get_name
 - mixer_get_num_ctls
 - mixer_ctl_get_id
 - mixer_ctl_get_name
 - mixer_ctl_get_type
 - mixer_ctl_get_type_string
 - mixer_ctl_get_num_values
 - mixer_ctl_get_num_enums
 - mixer_ctl_get_enum_string
 - mixer_ctl_get_percent
 - mixer_ctl_get_value
 - mixer_ctl_get_array
 - mixer_ctl_get_range_min
 - mixer_ctl_get_range_max

1 files changed, 13 insertions, 13 deletions

diff --git a/include/tinyalsa/mixer.h b/include/tinyalsa/mixer.h
index 4de6133..fb862f3 100644
--- a/include/tinyalsa/mixer.h
+++ b/include/tinyalsa/mixer.h
@@ -69,9 +69,9 @@ struct mixer *mixer_open(unsigned int card);
 
 void mixer_close(struct mixer *mixer);
 
-const char *mixer_get_name(struct mixer *mixer);
+const char *mixer_get_name(const struct mixer *mixer);
 
-unsigned int mixer_get_num_ctls(struct mixer *mixer);
+unsigned int mixer_get_num_ctls(const struct mixer *mixer);
 
 struct mixer_ctl *mixer_get_ctl(struct mixer *mixer, unsigned int id);
 
@@ -81,17 +81,17 @@ struct mixer_ctl *mixer_get_ctl_by_name_and_index(struct mixer *mixer,
                                                   const char *name,
                                                   unsigned int index);
 
-unsigned int mixer_ctl_get_id(struct mixer_ctl *ctl);
+unsigned int mixer_ctl_get_id(const struct mixer_ctl *ctl);
 
-const char *mixer_ctl_get_name(struct mixer_ctl *ctl);
+const char *mixer_ctl_get_name(const struct mixer_ctl *ctl);
 
-enum mixer_ctl_type mixer_ctl_get_type(struct mixer_ctl *ctl);
+enum mixer_ctl_type mixer_ctl_get_type(const struct mixer_ctl *ctl);
 
-const char *mixer_ctl_get_type_string(struct mixer_ctl *ctl);
+const char *mixer_ctl_get_type_string(const struct mixer_ctl *ctl);
 
-unsigned int mixer_ctl_get_num_values(struct mixer_ctl *ctl);
+unsigned int mixer_ctl_get_num_values(const struct mixer_ctl *ctl);
 
-unsigned int mixer_ctl_get_num_enums(struct mixer_ctl *ctl);
+unsigned int mixer_ctl_get_num_enums(const struct mixer_ctl *ctl);
 
 const char *mixer_ctl_get_enum_string(struct mixer_ctl *ctl, unsigned int enum_id);
 
@@ -102,13 +102,13 @@ const char *mixer_ctl_get_enum_string(struct mixer_ctl *ctl, unsigned int enum_i
 void mixer_ctl_update(struct mixer_ctl *ctl);
 
 /* Set and get mixer controls */
-int mixer_ctl_get_percent(struct mixer_ctl *ctl, unsigned int id);
+int mixer_ctl_get_percent(const struct mixer_ctl *ctl, unsigned int id);
 
 int mixer_ctl_set_percent(struct mixer_ctl *ctl, unsigned int id, int percent);
 
-int mixer_ctl_get_value(struct mixer_ctl *ctl, unsigned int id);
+int mixer_ctl_get_value(const struct mixer_ctl *ctl, unsigned int id);
 
-int mixer_ctl_get_array(struct mixer_ctl *ctl, void *array, size_t count);
+int mixer_ctl_get_array(const struct mixer_ctl *ctl, void *array, size_t count);
 
 int mixer_ctl_set_value(struct mixer_ctl *ctl, unsigned int id, int value);
 
@@ -117,9 +117,9 @@ int mixer_ctl_set_array(struct mixer_ctl *ctl, const void *array, size_t count);
 int mixer_ctl_set_enum_by_string(struct mixer_ctl *ctl, const char *string);
 
 /* Determe range of integer mixer controls */
-int mixer_ctl_get_range_min(struct mixer_ctl *ctl);
+int mixer_ctl_get_range_min(const struct mixer_ctl *ctl);
 
-int mixer_ctl_get_range_max(struct mixer_ctl *ctl);
+int mixer_ctl_get_range_max(const struct mixer_ctl *ctl);
 
 #if defined(__cplusplus)
 }  /* extern "C" */