ASoC: Constify passed data to core function

Several ASoC functions receive pointers to data which is not modified,
e.g. pointers to 'snd_soc_dai', 'snd_soc_pcm_runtime',
'snd_pcm_hw_params' and 'snd_soc_dai_link'.

All these pointers can be made as a pointer to const.  This makes code
safer, serves as clear annotation of function's intentions (no ownership
passed to the function, no modifications) and allows putting pointed
structures in rodata (if ever applicable).
Signed-off-by: Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org>
Link: https://msgid.link/r/20240617-n-asoc-const-auto-selectable-formats-v1-3-8004f346ee38@linaro.orgSigned-off-by: Mark Brown <broonie@kernel.org>

include/sound/soc-dai.h

@@ -180,8 +180,8 @@ int snd_soc_dai_set_pll(struct snd_soc_dai *dai,
 int snd_soc_dai_set_bclk_ratio(struct snd_soc_dai *dai, unsigned int ratio);
 
 /* Digital Audio interface formatting */
-int snd_soc_dai_get_fmt_max_priority(struct snd_soc_pcm_runtime *rtd);
-u64 snd_soc_dai_get_fmt(struct snd_soc_dai *dai, int priority);
+int snd_soc_dai_get_fmt_max_priority(const struct snd_soc_pcm_runtime *rtd);
+u64 snd_soc_dai_get_fmt(const struct snd_soc_dai *dai, int priority);
 int snd_soc_dai_set_fmt(struct snd_soc_dai *dai, unsigned int fmt);
 
 int snd_soc_dai_set_tdm_slot(struct snd_soc_dai *dai,
@@ -202,7 +202,7 @@ int snd_soc_dai_get_channel_map(struct snd_soc_dai *dai,
 		unsigned int *tx_num, unsigned int *tx_slot,
 		unsigned int *rx_num, unsigned int *rx_slot);
 
-int snd_soc_dai_is_dummy(struct snd_soc_dai *dai);
+int snd_soc_dai_is_dummy(const struct snd_soc_dai *dai);
 
 int snd_soc_dai_hw_params(struct snd_soc_dai *dai,
 			  struct snd_pcm_substream *substream,
@@ -218,7 +218,7 @@ void snd_soc_dai_suspend(struct snd_soc_dai *dai);
 void snd_soc_dai_resume(struct snd_soc_dai *dai);
 int snd_soc_dai_compress_new(struct snd_soc_dai *dai,
 			     struct snd_soc_pcm_runtime *rtd, int num);
-bool snd_soc_dai_stream_valid(struct snd_soc_dai *dai, int stream);
+bool snd_soc_dai_stream_valid(const struct snd_soc_dai *dai, int stream);
 void snd_soc_dai_link_set_capabilities(struct snd_soc_dai_link *dai_link);
 void snd_soc_dai_action(struct snd_soc_dai *dai,
 			int stream, int action);
@@ -232,7 +232,7 @@ static inline void snd_soc_dai_deactivate(struct snd_soc_dai *dai,
 {
 	snd_soc_dai_action(dai, stream, -1);
 }
-int snd_soc_dai_active(struct snd_soc_dai *dai);
+int snd_soc_dai_active(const struct snd_soc_dai *dai);
 
 int snd_soc_pcm_dai_probe(struct snd_soc_pcm_runtime *rtd, int order);
 int snd_soc_pcm_dai_remove(struct snd_soc_pcm_runtime *rtd, int order);
@@ -271,7 +271,7 @@ int snd_soc_dai_compr_get_metadata(struct snd_soc_dai *dai,
 				   struct snd_compr_stream *cstream,
 				   struct snd_compr_metadata *metadata);
 
-const char *snd_soc_dai_name_get(struct snd_soc_dai *dai);
+const char *snd_soc_dai_name_get(const struct snd_soc_dai *dai);
 
 struct snd_soc_dai_ops {
 	/* DAI driver callbacks */
@@ -518,7 +518,8 @@ static inline void snd_soc_dai_init_dma_data(struct snd_soc_dai *dai, void *play
 	snd_soc_dai_dma_data_set_capture(dai,  capture);
 }
 
-static inline unsigned int snd_soc_dai_tdm_mask_get(struct snd_soc_dai *dai, int stream)
+static inline unsigned int snd_soc_dai_tdm_mask_get(const struct snd_soc_dai *dai,
+						    int stream)
 {
 	return dai->stream[stream].tdm_mask;
 }
@@ -529,7 +530,8 @@ static inline void snd_soc_dai_tdm_mask_set(struct snd_soc_dai *dai, int stream,
 	dai->stream[stream].tdm_mask = tdm_mask;
 }
 
-static inline unsigned int snd_soc_dai_stream_active(struct snd_soc_dai *dai, int stream)
+static inline unsigned int snd_soc_dai_stream_active(const struct snd_soc_dai *dai,
+						     int stream)
 {
 	/* see snd_soc_dai_action() for setup */
 	return dai->stream[stream].active;

include/sound/soc.h

@@ -534,10 +534,10 @@ static inline int snd_soc_set_dmi_name(struct snd_soc_card *card,
 
 /* Utility functions to get clock rates from various things */
 int snd_soc_calc_frame_size(int sample_size, int channels, int tdm_slots);
-int snd_soc_params_to_frame_size(struct snd_pcm_hw_params *params);
+int snd_soc_params_to_frame_size(const struct snd_pcm_hw_params *params);
 int snd_soc_calc_bclk(int fs, int sample_size, int channels, int tdm_slots);
-int snd_soc_params_to_bclk(struct snd_pcm_hw_params *parms);
-int snd_soc_tdm_params_to_bclk(struct snd_pcm_hw_params *params,
+int snd_soc_params_to_bclk(const struct snd_pcm_hw_params *parms);
+int snd_soc_tdm_params_to_bclk(const struct snd_pcm_hw_params *params,
 			       int tdm_width, int tdm_slots, int slot_multiple);
 
 /* set runtime hw params */
@@ -837,7 +837,8 @@ struct snd_soc_dai_link {
 #endif
 };
 
-static inline int snd_soc_link_num_ch_map(struct snd_soc_dai_link *link) {
+static inline int snd_soc_link_num_ch_map(const struct snd_soc_dai_link *link)
+{
 	return max(link->num_cpus, link->num_codecs);
 }
 
@@ -1299,7 +1300,7 @@ struct soc_enum {
 #endif
 };
 
-static inline bool snd_soc_volsw_is_stereo(struct soc_mixer_control *mc)
+static inline bool snd_soc_volsw_is_stereo(const struct soc_mixer_control *mc)
 {
 	if (mc->reg == mc->rreg && mc->shift == mc->rshift)
 		return false;
@@ -1311,7 +1312,7 @@ static inline bool snd_soc_volsw_is_stereo(struct soc_mixer_control *mc)
 	return true;
 }
 
-static inline unsigned int snd_soc_enum_val_to_item(struct soc_enum *e,
+static inline unsigned int snd_soc_enum_val_to_item(const struct soc_enum *e,
 	unsigned int val)
 {
 	unsigned int i;
@@ -1326,7 +1327,7 @@ static inline unsigned int snd_soc_enum_val_to_item(struct soc_enum *e,
 	return 0;
 }
 
-static inline unsigned int snd_soc_enum_item_to_val(struct soc_enum *e,
+static inline unsigned int snd_soc_enum_item_to_val(const struct soc_enum *e,
 	unsigned int item)
 {
 	if (!e->values)
@@ -1401,7 +1402,7 @@ unsigned int snd_soc_daifmt_parse_clock_provider_raw(struct device_node *np,
 	snd_soc_daifmt_clock_provider_from_bitmap(			\
 		snd_soc_daifmt_parse_clock_provider_as_bitmap(np, prefix))
 
-int snd_soc_get_stream_cpu(struct snd_soc_dai_link *dai_link, int stream);
+int snd_soc_get_stream_cpu(const struct snd_soc_dai_link *dai_link, int stream);
 int snd_soc_get_dlc(const struct of_phandle_args *args,
 		    struct snd_soc_dai_link_component *dlc);
 int snd_soc_of_get_dlc(struct device_node *of_node,

sound/soc/soc-core.c

@@ -297,7 +297,7 @@ static int snd_soc_is_matching_dai(const struct snd_soc_dai_link_component *dlc,
 	return 0;
 }
 
-const char *snd_soc_dai_name_get(struct snd_soc_dai *dai)
+const char *snd_soc_dai_name_get(const struct snd_soc_dai *dai)
 {
 	/* see snd_soc_is_matching_dai() */
 	if (dai->driver->name)
@@ -3430,7 +3430,7 @@ unsigned int snd_soc_daifmt_parse_clock_provider_raw(struct device_node *np,
 }
 EXPORT_SYMBOL_GPL(snd_soc_daifmt_parse_clock_provider_raw);
 
-int snd_soc_get_stream_cpu(struct snd_soc_dai_link *dai_link, int stream)
+int snd_soc_get_stream_cpu(const struct snd_soc_dai_link *dai_link, int stream)
 {
 	/*
 	 * [Normal]

sound/soc/soc-dai.c

@@ -134,7 +134,7 @@ int snd_soc_dai_set_bclk_ratio(struct snd_soc_dai *dai, unsigned int ratio)
 }
 EXPORT_SYMBOL_GPL(snd_soc_dai_set_bclk_ratio);
 
-int snd_soc_dai_get_fmt_max_priority(struct snd_soc_pcm_runtime *rtd)
+int snd_soc_dai_get_fmt_max_priority(const struct snd_soc_pcm_runtime *rtd)
 {
 	struct snd_soc_dai *dai;
 	int i, max = 0;
@@ -166,7 +166,7 @@ int snd_soc_dai_get_fmt_max_priority(struct snd_soc_pcm_runtime *rtd)
  * modes.  This will mean that sometimes fewer formats
  * are reported here than are supported by set_fmt().
  */
-u64 snd_soc_dai_get_fmt(struct snd_soc_dai *dai, int priority)
+u64 snd_soc_dai_get_fmt(const struct snd_soc_dai *dai, int priority)
 {
 	const struct snd_soc_dai_ops *ops = dai->driver->ops;
 	u64 fmt = 0;
@@ -471,7 +471,7 @@ int snd_soc_dai_compress_new(struct snd_soc_dai *dai,
  *
  * Returns true if the DAI supports the indicated stream type.
  */
-bool snd_soc_dai_stream_valid(struct snd_soc_dai *dai, int dir)
+bool snd_soc_dai_stream_valid(const struct snd_soc_dai *dai, int dir)
 {
 	struct snd_soc_pcm_stream *stream = snd_soc_dai_get_pcm_stream(dai, dir);
 
@@ -528,7 +528,7 @@ void snd_soc_dai_action(struct snd_soc_dai *dai,
 }
 EXPORT_SYMBOL_GPL(snd_soc_dai_action);
 
-int snd_soc_dai_active(struct snd_soc_dai *dai)
+int snd_soc_dai_active(const struct snd_soc_dai *dai)
 {
 	int stream, active;
 

sound/soc/soc-utils.c

@@ -21,7 +21,7 @@ int snd_soc_calc_frame_size(int sample_size, int channels, int tdm_slots)
 }
 EXPORT_SYMBOL_GPL(snd_soc_calc_frame_size);
 
-int snd_soc_params_to_frame_size(struct snd_pcm_hw_params *params)
+int snd_soc_params_to_frame_size(const struct snd_pcm_hw_params *params)
 {
 	int sample_size;
 
@@ -40,7 +40,7 @@ int snd_soc_calc_bclk(int fs, int sample_size, int channels, int tdm_slots)
 }
 EXPORT_SYMBOL_GPL(snd_soc_calc_bclk);
 
-int snd_soc_params_to_bclk(struct snd_pcm_hw_params *params)
+int snd_soc_params_to_bclk(const struct snd_pcm_hw_params *params)
 {
 	int ret;
 
@@ -79,7 +79,7 @@ EXPORT_SYMBOL_GPL(snd_soc_params_to_bclk);
  * Return: bclk frequency in Hz, else a negative error code if params format
  *	   is invalid.
  */
-int snd_soc_tdm_params_to_bclk(struct snd_pcm_hw_params *params,
+int snd_soc_tdm_params_to_bclk(const struct snd_pcm_hw_params *params,
 			       int tdm_width, int tdm_slots, int slot_multiple)
 {
 	if (!tdm_slots)
@@ -211,7 +211,7 @@ static struct snd_soc_dai_driver dummy_dai = {
 	.ops = &dummy_dai_ops,
 };
 
-int snd_soc_dai_is_dummy(struct snd_soc_dai *dai)
+int snd_soc_dai_is_dummy(const struct snd_soc_dai *dai)
 {
 	if (dai->driver == &dummy_dai)
 		return 1;