ctl: improve documentation of APIs to add an element set

Currently, documentation of APIs to add an element set describes causes of
errors partly. But it gives an opinion to describe them thoroughly. This
is not good for users.

This commit changes the documentation so that it partly describes the
causes.

Signed-off-by: Takashi Sakamoto <o-takashi@sakamocchi.jp>
Signed-off-by: Takashi Iwai <tiwai@suse.de>

diff --git a/src/control/control.c b/src/control/control.c
index 85485aac4f1fb4d7c49e5f6fee42f14959440db2..9bb802199cb5dc0daa9d50d0713cc7f44ac4a7f9 100644 (file)
--- a/src/control/control.c
+++ b/src/control/control.c
@@ -358,7 +358,8 @@ static bool validate_element_member_dimension(snd_ctl_elem_info_t *info)
  * <dt>-EBUSY
  * <dd>A element with ID \a id already exists.
  * <dt>-EINVAL
- * <dd>ID has no name, or the number of members is not between 1 to 127.
+ * <dd>Some arguments include invalid value; i.e. ID field in \a info has no
+ *     name, or the number of members is not between 1 to 127.
  * <dt>-ENOMEM
  * <dd>Out of memory, or there are too many user elements.
  * <dt>-ENXIO
@@ -446,7 +447,8 @@ int snd_ctl_elem_add_integer_set(snd_ctl_t *ctl, snd_ctl_elem_info_t *info,
  * <dt>-EBUSY
  * <dd>A element with ID \a id already exists.
  * <dt>-EINVAL
- * <dd>ID has no name, or the number of members is not between 1 to 127.
+ * <dd>Some arguments include invalid value; i.e. ID has no name, or the number
+ *     of members is not between 1 to 127.
  * <dt>-ENOMEM
  * <dd>Out of memory, or there are too many user elements.
  * <dt>-ENXIO
@@ -530,7 +532,8 @@ int snd_ctl_elem_add_integer64_set(snd_ctl_t *ctl, snd_ctl_elem_info_t *info,
  * <dt>-EBUSY
  * <dd>A element with ID \a id already exists.
  * <dt>-EINVAL
- * <dd>ID has no name, or the number of members is not between 1 to 127.
+ * <dd>Some parameters include invalid value; i.e. ID has no name, or the number
+ *      of members is not between 1 to 127.
  * <dt>-ENOMEM
  * <dd>Out of memory, or there are too many user elements.
  * <dt>-ENXIO
@@ -591,9 +594,10 @@ int snd_ctl_elem_add_boolean_set(snd_ctl_t *ctl, snd_ctl_elem_info_t *info,
  * <dt>-EBUSY
  * <dd>A control element with ID \a id already exists.
  * <dt>-EINVAL
- * <dd>\a element_count is not between 1 to 127, or \a items is not at least
- *     one, or a string in \a labels is empty, or longer than 63 bytes, or total
- *     length of the labels requires more than 64 KiB storage.
+ * <dd>Some arguments include invalid value; i.e. \a element_count is not
+ *     between 1 to 127, or \a items is not at least one, or a string in \a
+ *     labels is empty, or longer than 63 bytes, or total length of the labels
+ *     requires more than 64 KiB storage.
  * <dt>-ENOMEM
  * <dd>Out of memory, or there are too many user control elements.
  * <dt>-ENXIO
@@ -677,7 +681,8 @@ int snd_ctl_elem_add_enumerated_set(snd_ctl_t *ctl, snd_ctl_elem_info_t *info,
  * <dt>-EBUSY
  * <dd>A element with ID \a id already exists.
  * <dt>-EINVAL
- * <dd>ID has no name, or the number of members is not between 1 to 511.
+ * <dd>Some arguments include invalid value; i.e. ID has no name, or the number
+ *     of members is not between 1 to 511.
  * <dt>-ENOMEM
  * <dd>Out of memory, or there are too many user elements.
  * <dt>-ENXIO