ALSA: add/change some comments describing function return values
script/kernel-doc reports the following type of warnings (when run in verbose
mode):
Warning(sound/core/init.c:152): No description found for return value of
'snd_card_create'
To fix that:
- add missing descriptions of function return values
- use "Return:" sections to describe those return values
Along the way:
- complete some descriptions
- fix some typos
Signed-off-by: Yacine Belkadi <yacine.belkadi.1@gmail.com>
Signed-off-by: Takashi Iwai <tiwai@suse.de>
diff --git a/sound/core/control.c b/sound/core/control.c
index 8c7c2c9..d8aa206 100644
--- a/sound/core/control.c
+++ b/sound/core/control.c
@@ -190,7 +190,7 @@
* Allocates a new struct snd_kcontrol instance and copies the given template
* to the new instance. It does not copy volatile data (access).
*
- * Returns the pointer of the new instance, or NULL on failure.
+ * Return: The pointer of the new instance, or %NULL on failure.
*/
static struct snd_kcontrol *snd_ctl_new(struct snd_kcontrol *control,
unsigned int access)
@@ -224,7 +224,7 @@
* template. When the access field of ncontrol is 0, it's assumed as
* READWRITE access. When the count field is 0, it's assumes as one.
*
- * Returns the pointer of the newly generated instance, or NULL on failure.
+ * Return: The pointer of the newly generated instance, or %NULL on failure.
*/
struct snd_kcontrol *snd_ctl_new1(const struct snd_kcontrol_new *ncontrol,
void *private_data)
@@ -322,9 +322,10 @@
* snd_ctl_new1() to the given card. Assigns also an unique
* numid used for fast search.
*
- * Returns zero if successful, or a negative error code on failure.
- *
* It frees automatically the control which cannot be added.
+ *
+ * Return: Zero if successful, or a negative error code on failure.
+ *
*/
int snd_ctl_add(struct snd_card *card, struct snd_kcontrol *kcontrol)
{
@@ -380,9 +381,9 @@
* and the add_on_replace flag is set, the control is added. If the
* control exists, it is destroyed first.
*
- * Returns zero if successful, or a negative error code on failure.
- *
* It frees automatically the control which cannot be added or replaced.
+ *
+ * Return: Zero if successful, or a negative error code on failure.
*/
int snd_ctl_replace(struct snd_card *card, struct snd_kcontrol *kcontrol,
bool add_on_replace)
@@ -442,8 +443,8 @@
* Removes the control from the card and then releases the instance.
* You don't need to call snd_ctl_free_one(). You must be in
* the write lock - down_write(&card->controls_rwsem).
- *
- * Returns 0 if successful, or a negative error code on failure.
+ *
+ * Return: 0 if successful, or a negative error code on failure.
*/
int snd_ctl_remove(struct snd_card *card, struct snd_kcontrol *kcontrol)
{
@@ -470,8 +471,8 @@
*
* Finds the control instance with the given id, removes it from the
* card list and releases it.
- *
- * Returns 0 if successful, or a negative error code on failure.
+ *
+ * Return: 0 if successful, or a negative error code on failure.
*/
int snd_ctl_remove_id(struct snd_card *card, struct snd_ctl_elem_id *id)
{
@@ -498,8 +499,8 @@
*
* Finds the control instance with the given id, removes it from the
* card list and releases it.
- *
- * Returns 0 if successful, or a negative error code on failure.
+ *
+ * Return: 0 if successful, or a negative error code on failure.
*/
static int snd_ctl_remove_user_ctl(struct snd_ctl_file * file,
struct snd_ctl_elem_id *id)
@@ -541,7 +542,7 @@
* Finds the control instance with the given id, and activate or
* inactivate the control together with notification, if changed.
*
- * Returns 0 if unchanged, 1 if changed, or a negative error code on failure.
+ * Return: 0 if unchanged, 1 if changed, or a negative error code on failure.
*/
int snd_ctl_activate_id(struct snd_card *card, struct snd_ctl_elem_id *id,
int active)
@@ -587,7 +588,7 @@
* Finds the control with the old id from the card, and replaces the
* id with the new one.
*
- * Returns zero if successful, or a negative error code on failure.
+ * Return: Zero if successful, or a negative error code on failure.
*/
int snd_ctl_rename_id(struct snd_card *card, struct snd_ctl_elem_id *src_id,
struct snd_ctl_elem_id *dst_id)
@@ -616,10 +617,11 @@
*
* Finds the control instance with the given number-id from the card.
*
- * Returns the pointer of the instance if found, or NULL if not.
- *
* The caller must down card->controls_rwsem before calling this function
* (if the race condition can happen).
+ *
+ * Return: The pointer of the instance if found, or %NULL if not.
+ *
*/
struct snd_kcontrol *snd_ctl_find_numid(struct snd_card *card, unsigned int numid)
{
@@ -643,10 +645,11 @@
*
* Finds the control instance with the given id from the card.
*
- * Returns the pointer of the instance if found, or NULL if not.
- *
* The caller must down card->controls_rwsem before calling this function
* (if the race condition can happen).
+ *
+ * Return: The pointer of the instance if found, or %NULL if not.
+ *
*/
struct snd_kcontrol *snd_ctl_find_id(struct snd_card *card,
struct snd_ctl_elem_id *id)
@@ -1710,6 +1713,8 @@
* Sets all required fields in @info to their appropriate values.
* If the control's accessibility is not the default (readable and writable),
* the caller has to fill @info->access.
+ *
+ * Return: Zero.
*/
int snd_ctl_enum_info(struct snd_ctl_elem_info *info, unsigned int channels,
unsigned int items, const char *const names[])
diff --git a/sound/core/device.c b/sound/core/device.c
index f03cb54..df88def 100644
--- a/sound/core/device.c
+++ b/sound/core/device.c
@@ -39,7 +39,7 @@
* The data pointer plays a role as the identifier, too, so the
* pointer address must be unique and unchanged.
*
- * Returns zero if successful, or a negative error code on failure.
+ * Return: Zero if successful, or a negative error code on failure.
*/
int snd_device_new(struct snd_card *card, snd_device_type_t type,
void *device_data, struct snd_device_ops *ops)
@@ -73,7 +73,7 @@
* callbacks, dev_disconnect and dev_free, corresponding to the state.
* Then release the device.
*
- * Returns zero if successful, or a negative error code on failure or if the
+ * Return: Zero if successful, or a negative error code on failure or if the
* device not found.
*/
int snd_device_free(struct snd_card *card, void *device_data)
@@ -116,7 +116,7 @@
*
* Usually called from snd_card_disconnect().
*
- * Returns zero if successful, or a negative error code on failure or if the
+ * Return: Zero if successful, or a negative error code on failure or if the
* device not found.
*/
int snd_device_disconnect(struct snd_card *card, void *device_data)
@@ -151,7 +151,7 @@
* but it can be called later if any new devices are created after
* invocation of snd_card_register().
*
- * Returns zero if successful, or a negative error code on failure or if the
+ * Return: Zero if successful, or a negative error code on failure or if the
* device not found.
*/
int snd_device_register(struct snd_card *card, void *device_data)
diff --git a/sound/core/hwdep.c b/sound/core/hwdep.c
index 3f7f662..d105073 100644
--- a/sound/core/hwdep.c
+++ b/sound/core/hwdep.c
@@ -356,7 +356,7 @@
* The callbacks (hwdep->ops) must be set on the returned instance
* after this call manually by the caller.
*
- * Returns zero if successful, or a negative error code on failure.
+ * Return: Zero if successful, or a negative error code on failure.
*/
int snd_hwdep_new(struct snd_card *card, char *id, int device,
struct snd_hwdep **rhwdep)
diff --git a/sound/core/info.c b/sound/core/info.c
index 5bb97e7..db308db 100644
--- a/sound/core/info.c
+++ b/sound/core/info.c
@@ -105,7 +105,7 @@
*
* Outputs the string on the procfs buffer just like printf().
*
- * Returns the size of output string.
+ * Return: The size of output string, or a negative error code.
*/
int snd_iprintf(struct snd_info_buffer *buffer, const char *fmt, ...)
{
@@ -694,7 +694,7 @@
*
* Reads one line from the buffer and stores the string.
*
- * Returns zero if successful, or 1 if error or EOF.
+ * Return: Zero if successful, or 1 if error or EOF.
*/
int snd_info_get_line(struct snd_info_buffer *buffer, char *line, int len)
{
@@ -735,7 +735,7 @@
* Parses the original string and copy a token to the given
* string buffer.
*
- * Returns the updated pointer of the original string so that
+ * Return: The updated pointer of the original string so that
* it can be used for the next call.
*/
const char *snd_info_get_str(char *dest, const char *src, int len)
@@ -774,7 +774,7 @@
* Usually called from other functions such as
* snd_info_create_card_entry().
*
- * Returns the pointer of the new instance, or NULL on failure.
+ * Return: The pointer of the new instance, or %NULL on failure.
*/
static struct snd_info_entry *snd_info_create_entry(const char *name)
{
@@ -803,7 +803,7 @@
*
* Creates a new info entry and assigns it to the given module.
*
- * Returns the pointer of the new instance, or NULL on failure.
+ * Return: The pointer of the new instance, or %NULL on failure.
*/
struct snd_info_entry *snd_info_create_module_entry(struct module * module,
const char *name,
@@ -827,7 +827,7 @@
*
* Creates a new info entry and assigns it to the given card.
*
- * Returns the pointer of the new instance, or NULL on failure.
+ * Return: The pointer of the new instance, or %NULL on failure.
*/
struct snd_info_entry *snd_info_create_card_entry(struct snd_card *card,
const char *name,
@@ -893,7 +893,7 @@
* For releasing this entry, use snd_device_free() instead of
* snd_info_free_entry().
*
- * Returns zero if successful, or a negative error code on failure.
+ * Return: Zero if successful, or a negative error code on failure.
*/
int snd_card_proc_new(struct snd_card *card, const char *name,
struct snd_info_entry **entryp)
@@ -949,7 +949,7 @@
*
* Registers the proc info entry.
*
- * Returns zero if successful, or a negative error code on failure.
+ * Return: Zero if successful, or a negative error code on failure.
*/
int snd_info_register(struct snd_info_entry * entry)
{
diff --git a/sound/core/init.c b/sound/core/init.c
index 7b012d1..6ef0640 100644
--- a/sound/core/init.c
+++ b/sound/core/init.c
@@ -144,7 +144,7 @@
* space for the driver to use freely. The allocated struct is stored
* in the given card_ret pointer.
*
- * Returns zero if successful or a negative error code.
+ * Return: Zero if successful or a negative error code.
*/
int snd_card_create(int idx, const char *xid,
struct module *module, int extra_size,
@@ -337,7 +337,7 @@
*
* Disconnects all APIs from the file-operations (user space).
*
- * Returns zero, otherwise a negative error code.
+ * Return: Zero, otherwise a negative error code.
*
* Note: The current implementation replaces all active file->f_op with special
* dummy file operations (they do nothing except release).
@@ -415,7 +415,7 @@
* devices automatically. That is, you don't have to release the devices
* by yourself.
*
- * Returns zero. Frees all associated devices and frees the control
+ * Return: Zero. Frees all associated devices and frees the control
* interface associated to given soundcard.
*/
static int snd_card_do_free(struct snd_card *card)
@@ -677,7 +677,7 @@
* external accesses. Thus, you should call this function at the end
* of the initialization of the card.
*
- * Returns zero otherwise a negative error code if the registration failed.
+ * Return: Zero otherwise a negative error code if the registration failed.
*/
int snd_card_register(struct snd_card *card)
{
@@ -849,7 +849,7 @@
* This function adds the component id string to the supported list.
* The component can be referred from the alsa-lib.
*
- * Returns zero otherwise a negative error code.
+ * Return: Zero otherwise a negative error code.
*/
int snd_component_add(struct snd_card *card, const char *component)
@@ -883,7 +883,7 @@
* This linked-list is used to keep tracking the connection state,
* and to avoid the release of busy resources by hotplug.
*
- * Returns zero or a negative error code.
+ * Return: zero or a negative error code.
*/
int snd_card_file_add(struct snd_card *card, struct file *file)
{
@@ -920,7 +920,7 @@
* called beforehand, it processes the pending release of
* resources.
*
- * Returns zero or a negative error code.
+ * Return: Zero or a negative error code.
*/
int snd_card_file_remove(struct snd_card *card, struct file *file)
{
@@ -959,6 +959,8 @@
*
* Waits until the power-state is changed.
*
+ * Return: Zero if successful, or a negative error code.
+ *
* Note: the power lock must be active before call.
*/
int snd_power_wait(struct snd_card *card, unsigned int power_state)
diff --git a/sound/core/isadma.c b/sound/core/isadma.c
index c0f1208..e2b3861 100644
--- a/sound/core/isadma.c
+++ b/sound/core/isadma.c
@@ -81,7 +81,7 @@
* @dma: the dma number
* @size: the dma transfer size
*
- * Returns the current pointer in DMA tranfer buffer in bytes
+ * Return: The current pointer in DMA transfer buffer in bytes.
*/
unsigned int snd_dma_pointer(unsigned long dma, unsigned int size)
{
diff --git a/sound/core/jack.c b/sound/core/jack.c
index a06b165..b35fe73 100644
--- a/sound/core/jack.c
+++ b/sound/core/jack.c
@@ -98,8 +98,8 @@
*
* Creates a new jack object.
*
- * Returns zero if successful, or a negative error code on failure.
- * On success jjack will be initialised.
+ * Return: Zero if successful, or a negative error code on failure.
+ * On success @jjack will be initialised.
*/
int snd_jack_new(struct snd_card *card, const char *id, int type,
struct snd_jack **jjack)
@@ -189,6 +189,8 @@
* using this abstraction.
*
* This function may only be called prior to registration of the jack.
+ *
+ * Return: Zero if successful, or a negative error code on failure.
*/
int snd_jack_set_key(struct snd_jack *jack, enum snd_jack_types type,
int keytype)
diff --git a/sound/core/memalloc.c b/sound/core/memalloc.c
index 6915692..bdf826f 100644
--- a/sound/core/memalloc.c
+++ b/sound/core/memalloc.c
@@ -81,7 +81,7 @@
*
* Allocates the physically contiguous pages with the given size.
*
- * Returns the pointer of the buffer, or NULL if no enoguh memory.
+ * Return: The pointer of the buffer, or %NULL if no enough memory.
*/
void *snd_malloc_pages(size_t size, gfp_t gfp_flags)
{
@@ -175,9 +175,9 @@
*
* Calls the memory-allocator function for the corresponding
* buffer type.
- *
- * Returns zero if the buffer with the given size is allocated successfully,
- * other a negative value at error.
+ *
+ * Return: Zero if the buffer with the given size is allocated successfully,
+ * otherwise a negative value on error.
*/
int snd_dma_alloc_pages(int type, struct device *device, size_t size,
struct snd_dma_buffer *dmab)
@@ -229,9 +229,9 @@
* buffer type. When no space is left, this function reduces the size and
* tries to allocate again. The size actually allocated is stored in
* res_size argument.
- *
- * Returns zero if the buffer with the given size is allocated successfully,
- * other a negative value at error.
+ *
+ * Return: Zero if the buffer with the given size is allocated successfully,
+ * otherwise a negative value on error.
*/
int snd_dma_alloc_pages_fallback(int type, struct device *device, size_t size,
struct snd_dma_buffer *dmab)
@@ -292,7 +292,7 @@
* Looks for the reserved-buffer list and re-uses if the same buffer
* is found in the list. When the buffer is found, it's removed from the free list.
*
- * Returns the size of buffer if the buffer is found, or zero if not found.
+ * Return: The size of buffer if the buffer is found, or zero if not found.
*/
size_t snd_dma_get_reserved_buf(struct snd_dma_buffer *dmab, unsigned int id)
{
@@ -326,8 +326,8 @@
* @id: the buffer id
*
* Reserves the given buffer as a reserved buffer.
- *
- * Returns zero if successful, or a negative code at error.
+ *
+ * Return: Zero if successful, or a negative code on error.
*/
int snd_dma_reserve_buf(struct snd_dma_buffer *dmab, unsigned int id)
{
diff --git a/sound/core/memory.c b/sound/core/memory.c
index 66a278d..36c0f1a 100644
--- a/sound/core/memory.c
+++ b/sound/core/memory.c
@@ -33,7 +33,7 @@
*
* Copies the data from mmio-space to user-space.
*
- * Returns zero if successful, or non-zero on failure.
+ * Return: Zero if successful, or non-zero on failure.
*/
int copy_to_user_fromio(void __user *dst, const volatile void __iomem *src, size_t count)
{
@@ -66,7 +66,7 @@
*
* Copies the data from user-space to mmio-space.
*
- * Returns zero if successful, or non-zero on failure.
+ * Return: Zero if successful, or non-zero on failure.
*/
int copy_from_user_toio(volatile void __iomem *dst, const void __user *src, size_t count)
{
diff --git a/sound/core/pcm.c b/sound/core/pcm.c
index 61798f8..578327e 100644
--- a/sound/core/pcm.c
+++ b/sound/core/pcm.c
@@ -637,7 +637,7 @@
* calling this, i.e. zero must be given to the argument of
* snd_pcm_new().
*
- * Returns zero if successful, or a negative error code on failure.
+ * Return: Zero if successful, or a negative error code on failure.
*/
int snd_pcm_new_stream(struct snd_pcm *pcm, int stream, int substream_count)
{
@@ -759,7 +759,7 @@
* The pcm operators have to be set afterwards to the new instance
* via snd_pcm_set_ops().
*
- * Returns zero if successful, or a negative error code on failure.
+ * Return: Zero if successful, or a negative error code on failure.
*/
int snd_pcm_new(struct snd_card *card, const char *id, int device,
int playback_count, int capture_count, struct snd_pcm **rpcm)
@@ -787,7 +787,7 @@
* The pcm operators have to be set afterwards to the new instance
* via snd_pcm_set_ops().
*
- * Returns zero if successful, or a negative error code on failure.
+ * Return: Zero if successful, or a negative error code on failure.
*/
int snd_pcm_new_internal(struct snd_card *card, const char *id, int device,
int playback_count, int capture_count,
diff --git a/sound/core/pcm_lib.c b/sound/core/pcm_lib.c
index c4840ff..41b3dfe 100644
--- a/sound/core/pcm_lib.c
+++ b/sound/core/pcm_lib.c
@@ -666,7 +666,8 @@
* The interval is changed to the range satisfying both intervals.
* The interval status (min, max, integer, etc.) are evaluated.
*
- * Returns non-zero if the value is changed, zero if not changed.
+ * Return: Positive if the value is changed, zero if it's not changed, or a
+ * negative error code.
*/
int snd_interval_refine(struct snd_interval *i, const struct snd_interval *v)
{
@@ -865,7 +866,8 @@
* @nump: pointer to store the resultant numerator
* @denp: pointer to store the resultant denominator
*
- * Returns non-zero if the value is changed, zero if not changed.
+ * Return: Positive if the value is changed, zero if it's not changed, or a
+ * negative error code.
*/
int snd_interval_ratnum(struct snd_interval *i,
unsigned int rats_count, struct snd_ratnum *rats,
@@ -983,7 +985,8 @@
* @nump: pointer to store the resultant numerator
* @denp: pointer to store the resultant denominator
*
- * Returns non-zero if the value is changed, zero if not changed.
+ * Return: Positive if the value is changed, zero if it's not changed, or a
+ * negative error code.
*/
static int snd_interval_ratden(struct snd_interval *i,
unsigned int rats_count, struct snd_ratden *rats,
@@ -1082,7 +1085,8 @@
* When mask is non-zero, only the elements corresponding to bit 1 are
* evaluated.
*
- * Returns non-zero if the value is changed, zero if not changed.
+ * Return: Positive if the value is changed, zero if it's not changed, or a
+ * negative error code.
*/
int snd_interval_list(struct snd_interval *i, unsigned int count,
const unsigned int *list, unsigned int mask)
@@ -1142,7 +1146,7 @@
* @private: the private data pointer passed to function
* @dep: the dependent variables
*
- * Returns zero if successful, or a negative error code on failure.
+ * Return: Zero if successful, or a negative error code on failure.
*/
int snd_pcm_hw_rule_add(struct snd_pcm_runtime *runtime, unsigned int cond,
int var,
@@ -1200,6 +1204,8 @@
* @mask: the bitmap mask
*
* Apply the constraint of the given bitmap mask to a 32-bit mask parameter.
+ *
+ * Return: Zero if successful, or a negative error code on failure.
*/
int snd_pcm_hw_constraint_mask(struct snd_pcm_runtime *runtime, snd_pcm_hw_param_t var,
u_int32_t mask)
@@ -1220,6 +1226,8 @@
* @mask: the 64bit bitmap mask
*
* Apply the constraint of the given bitmap mask to a 64-bit mask parameter.
+ *
+ * Return: Zero if successful, or a negative error code on failure.
*/
int snd_pcm_hw_constraint_mask64(struct snd_pcm_runtime *runtime, snd_pcm_hw_param_t var,
u_int64_t mask)
@@ -1240,6 +1248,9 @@
* @var: hw_params variable to apply the integer constraint
*
* Apply the constraint of integer to an interval parameter.
+ *
+ * Return: Positive if the value is changed, zero if it's not changed, or a
+ * negative error code.
*/
int snd_pcm_hw_constraint_integer(struct snd_pcm_runtime *runtime, snd_pcm_hw_param_t var)
{
@@ -1257,6 +1268,9 @@
* @max: the maximal value
*
* Apply the min/max range constraint to an interval parameter.
+ *
+ * Return: Positive if the value is changed, zero if it's not changed, or a
+ * negative error code.
*/
int snd_pcm_hw_constraint_minmax(struct snd_pcm_runtime *runtime, snd_pcm_hw_param_t var,
unsigned int min, unsigned int max)
@@ -1288,6 +1302,8 @@
* @l: list
*
* Apply the list of constraints to an interval parameter.
+ *
+ * Return: Zero if successful, or a negative error code on failure.
*/
int snd_pcm_hw_constraint_list(struct snd_pcm_runtime *runtime,
unsigned int cond,
@@ -1322,6 +1338,8 @@
* @cond: condition bits
* @var: hw_params variable to apply the ratnums constraint
* @r: struct snd_ratnums constriants
+ *
+ * Return: Zero if successful, or a negative error code on failure.
*/
int snd_pcm_hw_constraint_ratnums(struct snd_pcm_runtime *runtime,
unsigned int cond,
@@ -1355,6 +1373,8 @@
* @cond: condition bits
* @var: hw_params variable to apply the ratdens constraint
* @r: struct snd_ratdens constriants
+ *
+ * Return: Zero if successful, or a negative error code on failure.
*/
int snd_pcm_hw_constraint_ratdens(struct snd_pcm_runtime *runtime,
unsigned int cond,
@@ -1386,6 +1406,8 @@
* @cond: condition bits
* @width: sample bits width
* @msbits: msbits width
+ *
+ * Return: Zero if successful, or a negative error code on failure.
*/
int snd_pcm_hw_constraint_msbits(struct snd_pcm_runtime *runtime,
unsigned int cond,
@@ -1414,6 +1436,8 @@
* @cond: condition bits
* @var: hw_params variable to apply the step constraint
* @step: step size
+ *
+ * Return: Zero if successful, or a negative error code on failure.
*/
int snd_pcm_hw_constraint_step(struct snd_pcm_runtime *runtime,
unsigned int cond,
@@ -1444,6 +1468,8 @@
* @runtime: PCM runtime instance
* @cond: condition bits
* @var: hw_params variable to apply the power-of-2 constraint
+ *
+ * Return: Zero if successful, or a negative error code on failure.
*/
int snd_pcm_hw_constraint_pow2(struct snd_pcm_runtime *runtime,
unsigned int cond,
@@ -1470,6 +1496,8 @@
* snd_pcm_hw_rule_noresample - add a rule to allow disabling hw resampling
* @runtime: PCM runtime instance
* @base_rate: the rate at which the hardware does not resample
+ *
+ * Return: Zero if successful, or a negative error code on failure.
*/
int snd_pcm_hw_rule_noresample(struct snd_pcm_runtime *runtime,
unsigned int base_rate)
@@ -1519,8 +1547,8 @@
* @var: parameter to retrieve
* @dir: pointer to the direction (-1,0,1) or %NULL
*
- * Return the value for field @var if it's fixed in configuration space
- * defined by @params. Return -%EINVAL otherwise.
+ * Return: The value for field @var if it's fixed in configuration space
+ * defined by @params. -%EINVAL otherwise.
*/
int snd_pcm_hw_param_value(const struct snd_pcm_hw_params *params,
snd_pcm_hw_param_t var, int *dir)
@@ -1591,7 +1619,8 @@
*
* Inside configuration space defined by @params remove from @var all
* values > minimum. Reduce configuration space accordingly.
- * Return the minimum.
+ *
+ * Return: The minimum, or a negative error code on failure.
*/
int snd_pcm_hw_param_first(struct snd_pcm_substream *pcm,
struct snd_pcm_hw_params *params,
@@ -1637,7 +1666,8 @@
*
* Inside configuration space defined by @params remove from @var all
* values < maximum. Reduce configuration space accordingly.
- * Return the maximum.
+ *
+ * Return: The maximum, or a negative error code on failure.
*/
int snd_pcm_hw_param_last(struct snd_pcm_substream *pcm,
struct snd_pcm_hw_params *params,
@@ -1665,6 +1695,8 @@
* The configuration chosen is that obtained fixing in this order:
* first access, first format, first subformat, min channels,
* min rate, min period time, max buffer size, min tick time
+ *
+ * Return: Zero if successful, or a negative error code on failure.
*/
int snd_pcm_hw_params_choose(struct snd_pcm_substream *pcm,
struct snd_pcm_hw_params *params)
@@ -1771,7 +1803,7 @@
* Processes the generic ioctl commands for PCM.
* Can be passed as the ioctl callback for PCM ops.
*
- * Returns zero if successful, or a negative error code on failure.
+ * Return: Zero if successful, or a negative error code on failure.
*/
int snd_pcm_lib_ioctl(struct snd_pcm_substream *substream,
unsigned int cmd, void *arg)
@@ -2510,7 +2542,7 @@
* @info_ret: store struct snd_pcm_chmap instance if non-NULL
*
* Create channel-mapping control elements assigned to the given PCM stream(s).
- * Returns zero if succeed, or a negative error value.
+ * Return: Zero if successful, or a negative error value.
*/
int snd_pcm_add_chmap_ctls(struct snd_pcm *pcm, int stream,
const struct snd_pcm_chmap_elem *chmap,
diff --git a/sound/core/pcm_memory.c b/sound/core/pcm_memory.c
index 69e01c4..0af622c 100644
--- a/sound/core/pcm_memory.c
+++ b/sound/core/pcm_memory.c
@@ -95,7 +95,7 @@
*
* Releases the pre-allocated buffer of the given substream.
*
- * Returns zero if successful, or a negative error code on failure.
+ * Return: Zero if successful, or a negative error code on failure.
*/
int snd_pcm_lib_preallocate_free(struct snd_pcm_substream *substream)
{
@@ -115,7 +115,7 @@
*
* Releases all the pre-allocated buffers on the given pcm.
*
- * Returns zero if successful, or a negative error code on failure.
+ * Return: Zero if successful, or a negative error code on failure.
*/
int snd_pcm_lib_preallocate_free_for_all(struct snd_pcm *pcm)
{
@@ -265,7 +265,7 @@
* destruction time. The dma_buf_id must be unique for all systems
* (in the same DMA buffer type) e.g. using snd_dma_pci_buf_id().
*
- * Returns zero if successful, or a negative error code on failure.
+ * Return: Zero if successful, or a negative error code on failure.
*/
int snd_pcm_lib_preallocate_pages(struct snd_pcm_substream *substream,
int type, struct device *data,
@@ -289,7 +289,7 @@
* Do pre-allocation to all substreams of the given pcm for the
* specified DMA type.
*
- * Returns zero if successful, or a negative error code on failure.
+ * Return: Zero if successful, or a negative error code on failure.
*/
int snd_pcm_lib_preallocate_pages_for_all(struct snd_pcm *pcm,
int type, void *data,
@@ -313,8 +313,9 @@
* @substream: the pcm substream instance
* @offset: the buffer offset
*
- * Returns the page struct at the given buffer offset.
* Used as the page callback of PCM ops.
+ *
+ * Return: The page struct at the given buffer offset. %NULL on failure.
*/
struct page *snd_pcm_sgbuf_ops_page(struct snd_pcm_substream *substream, unsigned long offset)
{
@@ -337,7 +338,7 @@
* Allocates the DMA buffer on the BUS type given earlier to
* snd_pcm_lib_preallocate_xxx_pages().
*
- * Returns 1 if the buffer is changed, 0 if not changed, or a negative
+ * Return: 1 if the buffer is changed, 0 if not changed, or a negative
* code on failure.
*/
int snd_pcm_lib_malloc_pages(struct snd_pcm_substream *substream, size_t size)
@@ -390,7 +391,7 @@
*
* Releases the DMA buffer allocated via snd_pcm_lib_malloc_pages().
*
- * Returns zero if successful, or a negative error code on failure.
+ * Return: Zero if successful, or a negative error code on failure.
*/
int snd_pcm_lib_free_pages(struct snd_pcm_substream *substream)
{
@@ -437,6 +438,8 @@
* snd_pcm_lib_free_vmalloc_buffer - free vmalloc buffer
* @substream: the substream with a buffer allocated by
* snd_pcm_lib_alloc_vmalloc_buffer()
+ *
+ * Return: Zero if successful, or a negative error code on failure.
*/
int snd_pcm_lib_free_vmalloc_buffer(struct snd_pcm_substream *substream)
{
@@ -458,6 +461,8 @@
* @offset: offset in the buffer
*
* This function is to be used as the page callback in the PCM ops.
+ *
+ * Return: The page struct, or %NULL on failure.
*/
struct page *snd_pcm_lib_get_vmalloc_page(struct snd_pcm_substream *substream,
unsigned long offset)
diff --git a/sound/core/pcm_misc.c b/sound/core/pcm_misc.c
index d4fc1bf..b875b19 100644
--- a/sound/core/pcm_misc.c
+++ b/sound/core/pcm_misc.c
@@ -213,7 +213,7 @@
* snd_pcm_format_signed - Check the PCM format is signed linear
* @format: the format to check
*
- * Returns 1 if the given PCM format is signed linear, 0 if unsigned
+ * Return: 1 if the given PCM format is signed linear, 0 if unsigned
* linear, and a negative error code for non-linear formats.
*/
int snd_pcm_format_signed(snd_pcm_format_t format)
@@ -232,7 +232,7 @@
* snd_pcm_format_unsigned - Check the PCM format is unsigned linear
* @format: the format to check
*
- * Returns 1 if the given PCM format is unsigned linear, 0 if signed
+ * Return: 1 if the given PCM format is unsigned linear, 0 if signed
* linear, and a negative error code for non-linear formats.
*/
int snd_pcm_format_unsigned(snd_pcm_format_t format)
@@ -251,7 +251,7 @@
* snd_pcm_format_linear - Check the PCM format is linear
* @format: the format to check
*
- * Returns 1 if the given PCM format is linear, 0 if not.
+ * Return: 1 if the given PCM format is linear, 0 if not.
*/
int snd_pcm_format_linear(snd_pcm_format_t format)
{
@@ -264,7 +264,7 @@
* snd_pcm_format_little_endian - Check the PCM format is little-endian
* @format: the format to check
*
- * Returns 1 if the given PCM format is little-endian, 0 if
+ * Return: 1 if the given PCM format is little-endian, 0 if
* big-endian, or a negative error code if endian not specified.
*/
int snd_pcm_format_little_endian(snd_pcm_format_t format)
@@ -283,7 +283,7 @@
* snd_pcm_format_big_endian - Check the PCM format is big-endian
* @format: the format to check
*
- * Returns 1 if the given PCM format is big-endian, 0 if
+ * Return: 1 if the given PCM format is big-endian, 0 if
* little-endian, or a negative error code if endian not specified.
*/
int snd_pcm_format_big_endian(snd_pcm_format_t format)
@@ -302,7 +302,7 @@
* snd_pcm_format_width - return the bit-width of the format
* @format: the format to check
*
- * Returns the bit-width of the format, or a negative error code
+ * Return: The bit-width of the format, or a negative error code
* if unknown format.
*/
int snd_pcm_format_width(snd_pcm_format_t format)
@@ -321,7 +321,7 @@
* snd_pcm_format_physical_width - return the physical bit-width of the format
* @format: the format to check
*
- * Returns the physical bit-width of the format, or a negative error code
+ * Return: The physical bit-width of the format, or a negative error code
* if unknown format.
*/
int snd_pcm_format_physical_width(snd_pcm_format_t format)
@@ -341,7 +341,7 @@
* @format: the format to check
* @samples: sampling rate
*
- * Returns the byte size of the given samples for the format, or a
+ * Return: The byte size of the given samples for the format, or a
* negative error code if unknown format.
*/
ssize_t snd_pcm_format_size(snd_pcm_format_t format, size_t samples)
@@ -358,7 +358,7 @@
* snd_pcm_format_silence_64 - return the silent data in 8 bytes array
* @format: the format to check
*
- * Returns the format pattern to fill or NULL if error.
+ * Return: The format pattern to fill or %NULL if error.
*/
const unsigned char *snd_pcm_format_silence_64(snd_pcm_format_t format)
{
@@ -379,7 +379,7 @@
*
* Sets the silence data on the buffer for the given samples.
*
- * Returns zero if successful, or a negative error code on failure.
+ * Return: Zero if successful, or a negative error code on failure.
*/
int snd_pcm_format_set_silence(snd_pcm_format_t format, void *data, unsigned int samples)
{
@@ -449,7 +449,7 @@
* Determines the rate_min and rate_max fields from the rates bits of
* the given runtime->hw.
*
- * Returns zero if successful.
+ * Return: Zero if successful.
*/
int snd_pcm_limit_hw_rates(struct snd_pcm_runtime *runtime)
{
@@ -475,7 +475,7 @@
* snd_pcm_rate_to_rate_bit - converts sample rate to SNDRV_PCM_RATE_xxx bit
* @rate: the sample rate to convert
*
- * Returns the SNDRV_PCM_RATE_xxx flag that corresponds to the given rate, or
+ * Return: The SNDRV_PCM_RATE_xxx flag that corresponds to the given rate, or
* SNDRV_PCM_RATE_KNOT for an unknown rate.
*/
unsigned int snd_pcm_rate_to_rate_bit(unsigned int rate)
@@ -493,8 +493,8 @@
* snd_pcm_rate_bit_to_rate - converts SNDRV_PCM_RATE_xxx bit to sample rate
* @rate_bit: the rate bit to convert
*
- * Returns the sample rate that corresponds to the given SNDRV_PCM_RATE_xxx flag
- * or 0 for an unknown rate bit
+ * Return: The sample rate that corresponds to the given SNDRV_PCM_RATE_xxx flag
+ * or 0 for an unknown rate bit.
*/
unsigned int snd_pcm_rate_bit_to_rate(unsigned int rate_bit)
{
diff --git a/sound/core/pcm_native.c b/sound/core/pcm_native.c
index 71ae86c..5bce915 100644
--- a/sound/core/pcm_native.c
+++ b/sound/core/pcm_native.c
@@ -898,6 +898,8 @@
/**
* snd_pcm_start - start all linked streams
* @substream: the PCM substream instance
+ *
+ * Return: Zero if successful, or a negative error code.
*/
int snd_pcm_start(struct snd_pcm_substream *substream)
{
@@ -951,6 +953,8 @@
* @state: PCM state after stopping the stream
*
* The state of each stream is then changed to the given state unconditionally.
+ *
+ * Return: Zero if succesful, or a negative error code.
*/
int snd_pcm_stop(struct snd_pcm_substream *substream, snd_pcm_state_t state)
{
@@ -965,6 +969,8 @@
*
* After stopping, the state is changed to SETUP.
* Unlike snd_pcm_stop(), this affects only the given stream.
+ *
+ * Return: Zero if succesful, or a negative error code.
*/
int snd_pcm_drain_done(struct snd_pcm_substream *substream)
{
@@ -1098,6 +1104,9 @@
* @substream: the PCM substream
*
* After this call, all streams are changed to SUSPENDED state.
+ *
+ * Return: Zero if successful (or @substream is %NULL), or a negative error
+ * code.
*/
int snd_pcm_suspend(struct snd_pcm_substream *substream)
{
@@ -1120,6 +1129,8 @@
* @pcm: the PCM instance
*
* After this call, all streams are changed to SUSPENDED state.
+ *
+ * Return: Zero if successful (or @pcm is %NULL), or a negative error code.
*/
int snd_pcm_suspend_all(struct snd_pcm *pcm)
{
@@ -1343,6 +1354,8 @@
* snd_pcm_prepare - prepare the PCM substream to be triggerable
* @substream: the PCM substream instance
* @file: file to refer f_flags
+ *
+ * Return: Zero if successful, or a negative error code.
*/
static int snd_pcm_prepare(struct snd_pcm_substream *substream,
struct file *file)
diff --git a/sound/core/rawmidi.c b/sound/core/rawmidi.c
index 1bb95ae..7b596b5 100644
--- a/sound/core/rawmidi.c
+++ b/sound/core/rawmidi.c
@@ -863,7 +863,7 @@
*
* Reads the data from the internal buffer.
*
- * Returns the size of read data, or a negative error code on failure.
+ * Return: The size of read data, or a negative error code on failure.
*/
int snd_rawmidi_receive(struct snd_rawmidi_substream *substream,
const unsigned char *buffer, int count)
@@ -1024,8 +1024,8 @@
/**
* snd_rawmidi_transmit_empty - check whether the output buffer is empty
* @substream: the rawmidi substream
- *
- * Returns 1 if the internal output buffer is empty, 0 if not.
+ *
+ * Return: 1 if the internal output buffer is empty, 0 if not.
*/
int snd_rawmidi_transmit_empty(struct snd_rawmidi_substream *substream)
{
@@ -1055,7 +1055,7 @@
* and call snd_rawmidi_transmit_ack() after the transmission is
* finished.
*
- * Returns the size of copied data, or a negative error code on failure.
+ * Return: The size of copied data, or a negative error code on failure.
*/
int snd_rawmidi_transmit_peek(struct snd_rawmidi_substream *substream,
unsigned char *buffer, int count)
@@ -1107,7 +1107,7 @@
* the given size and updates the condition.
* Call after the transmission is finished.
*
- * Returns the advanced size if successful, or a negative error code on failure.
+ * Return: The advanced size if successful, or a negative error code on failure.
*/
int snd_rawmidi_transmit_ack(struct snd_rawmidi_substream *substream, int count)
{
@@ -1140,7 +1140,7 @@
*
* Copies data from the buffer to the device and advances the pointer.
*
- * Returns the copied size if successful, or a negative error code on failure.
+ * Return: The copied size if successful, or a negative error code on failure.
*/
int snd_rawmidi_transmit(struct snd_rawmidi_substream *substream,
unsigned char *buffer, int count)
@@ -1438,7 +1438,7 @@
* Creates a new rawmidi instance.
* Use snd_rawmidi_set_ops() to set the operators to the new instance.
*
- * Returns zero if successful, or a negative error code on failure.
+ * Return: Zero if successful, or a negative error code on failure.
*/
int snd_rawmidi_new(struct snd_card *card, char *id, int device,
int output_count, int input_count,
diff --git a/sound/core/sound.c b/sound/core/sound.c
index 70ccdab..f002bd9 100644
--- a/sound/core/sound.c
+++ b/sound/core/sound.c
@@ -102,6 +102,9 @@
* This function increments the reference counter of the card instance
* if an associated instance with the given minor number and type is found.
* The caller must call snd_card_unref() appropriately later.
+ *
+ * Return: The user data pointer if the specified device is found. %NULL
+ * otherwise.
*/
void *snd_lookup_minor_data(unsigned int minor, int type)
{
@@ -261,7 +264,7 @@
* Registers an ALSA device file for the given card.
* The operators have to be set in reg parameter.
*
- * Returns zero if successful, or a negative error code on failure.
+ * Return: Zero if successful, or a negative error code on failure.
*/
int snd_register_device_for_dev(int type, struct snd_card *card, int dev,
const struct file_operations *f_ops,
@@ -339,7 +342,7 @@
* Unregisters the device file already registered via
* snd_register_device().
*
- * Returns zero if sucecessful, or a negative error code on failure
+ * Return: Zero if successful, or a negative error code on failure.
*/
int snd_unregister_device(int type, struct snd_card *card, int dev)
{
diff --git a/sound/core/vmaster.c b/sound/core/vmaster.c
index 8575861..55c9d8c 100644
--- a/sound/core/vmaster.c
+++ b/sound/core/vmaster.c
@@ -362,8 +362,7 @@
* @name: name string of the control element to create
* @tlv: optional TLV int array for dB information
*
- * Creates a virtual matster control with the given name string.
- * Returns the created control element, or NULL for errors (ENOMEM).
+ * Creates a virtual master control with the given name string.
*
* After creating a vmaster element, you can add the slave controls
* via snd_ctl_add_slave() or snd_ctl_add_slave_uncached().
@@ -372,6 +371,8 @@
* for dB scale of the master control. It should be a single element
* with #SNDRV_CTL_TLVT_DB_SCALE, #SNDRV_CTL_TLV_DB_MINMAX or
* #SNDRV_CTL_TLVT_DB_MINMAX_MUTE type, and should be the max 0dB.
+ *
+ * Return: The created control element, or %NULL for errors (ENOMEM).
*/
struct snd_kcontrol *snd_ctl_make_virtual_master(char *name,
const unsigned int *tlv)
@@ -423,6 +424,8 @@
*
* Adds the given hook to the vmaster control element so that it's called
* at each time when the value is changed.
+ *
+ * Return: Zero.
*/
int snd_ctl_add_vmaster_hook(struct snd_kcontrol *kcontrol,
void (*hook)(void *private_data, int),