linux/sound/soc/generic/simple-card-utils.c
Pierre-Louis Bossart bd029fc868
ASoC: generic: simple-card-utils: remove useless assignment
cppcheck warning:

sound/soc/generic/simple-card-utils.c:258:10: style: Variable 'ret' is
assigned a value that is never used. [unreadVariable]
 int ret = 0;
         ^

Signed-off-by: Pierre-Louis Bossart <pierre-louis.bossart@linux.intel.com>
Link: https://lore.kernel.org/r/20210218221921.88991-7-pierre-louis.bossart@linux.intel.com
Signed-off-by: Mark Brown <broonie@kernel.org>
2021-03-10 13:06:58 +00:00

656 lines
16 KiB
C

// SPDX-License-Identifier: GPL-2.0
//
// simple-card-utils.c
//
// Copyright (c) 2016 Kuninori Morimoto <kuninori.morimoto.gx@renesas.com>
#include <linux/clk.h>
#include <linux/gpio.h>
#include <linux/gpio/consumer.h>
#include <linux/module.h>
#include <linux/of.h>
#include <linux/of_gpio.h>
#include <linux/of_graph.h>
#include <sound/jack.h>
#include <sound/simple_card_utils.h>
void asoc_simple_convert_fixup(struct asoc_simple_data *data,
struct snd_pcm_hw_params *params)
{
struct snd_interval *rate = hw_param_interval(params,
SNDRV_PCM_HW_PARAM_RATE);
struct snd_interval *channels = hw_param_interval(params,
SNDRV_PCM_HW_PARAM_CHANNELS);
if (data->convert_rate)
rate->min =
rate->max = data->convert_rate;
if (data->convert_channels)
channels->min =
channels->max = data->convert_channels;
}
EXPORT_SYMBOL_GPL(asoc_simple_convert_fixup);
void asoc_simple_parse_convert(struct device *dev,
struct device_node *np,
char *prefix,
struct asoc_simple_data *data)
{
char prop[128];
if (!prefix)
prefix = "";
/* sampling rate convert */
snprintf(prop, sizeof(prop), "%s%s", prefix, "convert-rate");
of_property_read_u32(np, prop, &data->convert_rate);
/* channels transfer */
snprintf(prop, sizeof(prop), "%s%s", prefix, "convert-channels");
of_property_read_u32(np, prop, &data->convert_channels);
}
EXPORT_SYMBOL_GPL(asoc_simple_parse_convert);
int asoc_simple_parse_daifmt(struct device *dev,
struct device_node *node,
struct device_node *codec,
char *prefix,
unsigned int *retfmt)
{
struct device_node *bitclkmaster = NULL;
struct device_node *framemaster = NULL;
unsigned int daifmt;
daifmt = snd_soc_of_parse_daifmt(node, prefix,
&bitclkmaster, &framemaster);
daifmt &= ~SND_SOC_DAIFMT_MASTER_MASK;
if (!bitclkmaster && !framemaster) {
/*
* No dai-link level and master setting was not found from
* sound node level, revert back to legacy DT parsing and
* take the settings from codec node.
*/
dev_dbg(dev, "Revert to legacy daifmt parsing\n");
daifmt = snd_soc_of_parse_daifmt(codec, NULL, NULL, NULL) |
(daifmt & ~SND_SOC_DAIFMT_CLOCK_MASK);
} else {
if (codec == bitclkmaster)
daifmt |= (codec == framemaster) ?
SND_SOC_DAIFMT_CBM_CFM : SND_SOC_DAIFMT_CBM_CFS;
else
daifmt |= (codec == framemaster) ?
SND_SOC_DAIFMT_CBS_CFM : SND_SOC_DAIFMT_CBS_CFS;
}
of_node_put(bitclkmaster);
of_node_put(framemaster);
*retfmt = daifmt;
return 0;
}
EXPORT_SYMBOL_GPL(asoc_simple_parse_daifmt);
int asoc_simple_set_dailink_name(struct device *dev,
struct snd_soc_dai_link *dai_link,
const char *fmt, ...)
{
va_list ap;
char *name = NULL;
int ret = -ENOMEM;
va_start(ap, fmt);
name = devm_kvasprintf(dev, GFP_KERNEL, fmt, ap);
va_end(ap);
if (name) {
ret = 0;
dai_link->name = name;
dai_link->stream_name = name;
}
return ret;
}
EXPORT_SYMBOL_GPL(asoc_simple_set_dailink_name);
int asoc_simple_parse_card_name(struct snd_soc_card *card,
char *prefix)
{
int ret;
if (!prefix)
prefix = "";
/* Parse the card name from DT */
ret = snd_soc_of_parse_card_name(card, "label");
if (ret < 0 || !card->name) {
char prop[128];
snprintf(prop, sizeof(prop), "%sname", prefix);
ret = snd_soc_of_parse_card_name(card, prop);
if (ret < 0)
return ret;
}
if (!card->name && card->dai_link)
card->name = card->dai_link->name;
return 0;
}
EXPORT_SYMBOL_GPL(asoc_simple_parse_card_name);
static int asoc_simple_clk_enable(struct asoc_simple_dai *dai)
{
if (dai)
return clk_prepare_enable(dai->clk);
return 0;
}
static void asoc_simple_clk_disable(struct asoc_simple_dai *dai)
{
if (dai)
clk_disable_unprepare(dai->clk);
}
int asoc_simple_parse_clk(struct device *dev,
struct device_node *node,
struct asoc_simple_dai *simple_dai,
struct snd_soc_dai_link_component *dlc)
{
struct clk *clk;
u32 val;
/*
* Parse dai->sysclk come from "clocks = <&xxx>"
* (if system has common clock)
* or "system-clock-frequency = <xxx>"
* or device's module clock.
*/
clk = devm_get_clk_from_child(dev, node, NULL);
if (IS_ERR(clk))
clk = devm_get_clk_from_child(dev, dlc->of_node, NULL);
if (!IS_ERR(clk)) {
simple_dai->clk = clk;
simple_dai->sysclk = clk_get_rate(clk);
} else if (!of_property_read_u32(node, "system-clock-frequency",
&val)) {
simple_dai->sysclk = val;
}
if (of_property_read_bool(node, "system-clock-direction-out"))
simple_dai->clk_direction = SND_SOC_CLOCK_OUT;
return 0;
}
EXPORT_SYMBOL_GPL(asoc_simple_parse_clk);
int asoc_simple_startup(struct snd_pcm_substream *substream)
{
struct snd_soc_pcm_runtime *rtd = asoc_substream_to_rtd(substream);
struct asoc_simple_priv *priv = snd_soc_card_get_drvdata(rtd->card);
struct simple_dai_props *dai_props = simple_priv_to_props(priv, rtd->num);
int ret;
ret = asoc_simple_clk_enable(dai_props->cpu_dai);
if (ret)
return ret;
ret = asoc_simple_clk_enable(dai_props->codec_dai);
if (ret)
asoc_simple_clk_disable(dai_props->cpu_dai);
return ret;
}
EXPORT_SYMBOL_GPL(asoc_simple_startup);
void asoc_simple_shutdown(struct snd_pcm_substream *substream)
{
struct snd_soc_pcm_runtime *rtd = asoc_substream_to_rtd(substream);
struct snd_soc_dai *codec_dai = asoc_rtd_to_codec(rtd, 0);
struct snd_soc_dai *cpu_dai = asoc_rtd_to_cpu(rtd, 0);
struct asoc_simple_priv *priv = snd_soc_card_get_drvdata(rtd->card);
struct simple_dai_props *dai_props =
simple_priv_to_props(priv, rtd->num);
if (dai_props->mclk_fs) {
snd_soc_dai_set_sysclk(codec_dai, 0, 0, SND_SOC_CLOCK_IN);
snd_soc_dai_set_sysclk(cpu_dai, 0, 0, SND_SOC_CLOCK_OUT);
}
asoc_simple_clk_disable(dai_props->cpu_dai);
asoc_simple_clk_disable(dai_props->codec_dai);
}
EXPORT_SYMBOL_GPL(asoc_simple_shutdown);
static int asoc_simple_set_clk_rate(struct asoc_simple_dai *simple_dai,
unsigned long rate)
{
if (!simple_dai)
return 0;
if (!simple_dai->clk)
return 0;
if (clk_get_rate(simple_dai->clk) == rate)
return 0;
return clk_set_rate(simple_dai->clk, rate);
}
int asoc_simple_hw_params(struct snd_pcm_substream *substream,
struct snd_pcm_hw_params *params)
{
struct snd_soc_pcm_runtime *rtd = asoc_substream_to_rtd(substream);
struct snd_soc_dai *codec_dai = asoc_rtd_to_codec(rtd, 0);
struct snd_soc_dai *cpu_dai = asoc_rtd_to_cpu(rtd, 0);
struct asoc_simple_priv *priv = snd_soc_card_get_drvdata(rtd->card);
struct simple_dai_props *dai_props =
simple_priv_to_props(priv, rtd->num);
unsigned int mclk, mclk_fs = 0;
int ret;
if (dai_props->mclk_fs)
mclk_fs = dai_props->mclk_fs;
if (mclk_fs) {
mclk = params_rate(params) * mclk_fs;
ret = asoc_simple_set_clk_rate(dai_props->codec_dai, mclk);
if (ret < 0)
return ret;
ret = asoc_simple_set_clk_rate(dai_props->cpu_dai, mclk);
if (ret < 0)
return ret;
ret = snd_soc_dai_set_sysclk(codec_dai, 0, mclk,
SND_SOC_CLOCK_IN);
if (ret && ret != -ENOTSUPP)
goto err;
ret = snd_soc_dai_set_sysclk(cpu_dai, 0, mclk,
SND_SOC_CLOCK_OUT);
if (ret && ret != -ENOTSUPP)
goto err;
}
return 0;
err:
return ret;
}
EXPORT_SYMBOL_GPL(asoc_simple_hw_params);
int asoc_simple_be_hw_params_fixup(struct snd_soc_pcm_runtime *rtd,
struct snd_pcm_hw_params *params)
{
struct asoc_simple_priv *priv = snd_soc_card_get_drvdata(rtd->card);
struct simple_dai_props *dai_props = simple_priv_to_props(priv, rtd->num);
asoc_simple_convert_fixup(&dai_props->adata, params);
return 0;
}
EXPORT_SYMBOL_GPL(asoc_simple_be_hw_params_fixup);
static int asoc_simple_init_dai(struct snd_soc_dai *dai,
struct asoc_simple_dai *simple_dai)
{
int ret;
if (!simple_dai)
return 0;
if (simple_dai->sysclk) {
ret = snd_soc_dai_set_sysclk(dai, 0, simple_dai->sysclk,
simple_dai->clk_direction);
if (ret && ret != -ENOTSUPP) {
dev_err(dai->dev, "simple-card: set_sysclk error\n");
return ret;
}
}
if (simple_dai->slots) {
ret = snd_soc_dai_set_tdm_slot(dai,
simple_dai->tx_slot_mask,
simple_dai->rx_slot_mask,
simple_dai->slots,
simple_dai->slot_width);
if (ret && ret != -ENOTSUPP) {
dev_err(dai->dev, "simple-card: set_tdm_slot error\n");
return ret;
}
}
return 0;
}
static int asoc_simple_init_dai_link_params(struct snd_soc_pcm_runtime *rtd,
struct simple_dai_props *dai_props)
{
struct snd_soc_dai_link *dai_link = rtd->dai_link;
struct snd_soc_component *component;
struct snd_soc_pcm_stream *params;
struct snd_pcm_hardware hw;
int i, ret, stream;
/* Only codecs should have non_legacy_dai_naming set. */
for_each_rtd_components(rtd, i, component) {
if (!component->driver->non_legacy_dai_naming)
return 0;
}
/* Assumes the capabilities are the same for all supported streams */
for_each_pcm_streams(stream) {
ret = snd_soc_runtime_calc_hw(rtd, &hw, stream);
if (ret == 0)
break;
}
if (ret < 0) {
dev_err(rtd->dev, "simple-card: no valid dai_link params\n");
return ret;
}
params = devm_kzalloc(rtd->dev, sizeof(*params), GFP_KERNEL);
if (!params)
return -ENOMEM;
params->formats = hw.formats;
params->rates = hw.rates;
params->rate_min = hw.rate_min;
params->rate_max = hw.rate_max;
params->channels_min = hw.channels_min;
params->channels_max = hw.channels_max;
dai_link->params = params;
dai_link->num_params = 1;
return 0;
}
int asoc_simple_dai_init(struct snd_soc_pcm_runtime *rtd)
{
struct asoc_simple_priv *priv = snd_soc_card_get_drvdata(rtd->card);
struct simple_dai_props *dai_props = simple_priv_to_props(priv, rtd->num);
int ret;
ret = asoc_simple_init_dai(asoc_rtd_to_codec(rtd, 0),
dai_props->codec_dai);
if (ret < 0)
return ret;
ret = asoc_simple_init_dai(asoc_rtd_to_cpu(rtd, 0),
dai_props->cpu_dai);
if (ret < 0)
return ret;
ret = asoc_simple_init_dai_link_params(rtd, dai_props);
if (ret < 0)
return ret;
return 0;
}
EXPORT_SYMBOL_GPL(asoc_simple_dai_init);
void asoc_simple_canonicalize_platform(struct snd_soc_dai_link *dai_link)
{
/* Assumes platform == cpu */
if (!dai_link->platforms->of_node)
dai_link->platforms->of_node = dai_link->cpus->of_node;
/*
* DPCM BE can be no platform.
* Alloced memory will be waste, but not leak.
*/
if (!dai_link->platforms->of_node)
dai_link->num_platforms = 0;
}
EXPORT_SYMBOL_GPL(asoc_simple_canonicalize_platform);
void asoc_simple_canonicalize_cpu(struct snd_soc_dai_link *dai_link,
int is_single_links)
{
/*
* In soc_bind_dai_link() will check cpu name after
* of_node matching if dai_link has cpu_dai_name.
* but, it will never match if name was created by
* fmt_single_name() remove cpu_dai_name if cpu_args
* was 0. See:
* fmt_single_name()
* fmt_multiple_name()
*/
if (is_single_links)
dai_link->cpus->dai_name = NULL;
}
EXPORT_SYMBOL_GPL(asoc_simple_canonicalize_cpu);
int asoc_simple_clean_reference(struct snd_soc_card *card)
{
struct snd_soc_dai_link *dai_link;
int i;
for_each_card_prelinks(card, i, dai_link) {
of_node_put(dai_link->cpus->of_node);
of_node_put(dai_link->codecs->of_node);
}
return 0;
}
EXPORT_SYMBOL_GPL(asoc_simple_clean_reference);
int asoc_simple_parse_routing(struct snd_soc_card *card,
char *prefix)
{
struct device_node *node = card->dev->of_node;
char prop[128];
if (!prefix)
prefix = "";
snprintf(prop, sizeof(prop), "%s%s", prefix, "routing");
if (!of_property_read_bool(node, prop))
return 0;
return snd_soc_of_parse_audio_routing(card, prop);
}
EXPORT_SYMBOL_GPL(asoc_simple_parse_routing);
int asoc_simple_parse_widgets(struct snd_soc_card *card,
char *prefix)
{
struct device_node *node = card->dev->of_node;
char prop[128];
if (!prefix)
prefix = "";
snprintf(prop, sizeof(prop), "%s%s", prefix, "widgets");
if (of_property_read_bool(node, prop))
return snd_soc_of_parse_audio_simple_widgets(card, prop);
/* no widgets is not error */
return 0;
}
EXPORT_SYMBOL_GPL(asoc_simple_parse_widgets);
int asoc_simple_parse_pin_switches(struct snd_soc_card *card,
char *prefix)
{
const unsigned int nb_controls_max = 16;
const char **strings, *control_name;
struct snd_kcontrol_new *controls;
struct device *dev = card->dev;
unsigned int i, nb_controls;
char prop[128];
int ret;
if (!prefix)
prefix = "";
snprintf(prop, sizeof(prop), "%s%s", prefix, "pin-switches");
if (!of_property_read_bool(dev->of_node, prop))
return 0;
strings = devm_kcalloc(dev, nb_controls_max,
sizeof(*strings), GFP_KERNEL);
if (!strings)
return -ENOMEM;
ret = of_property_read_string_array(dev->of_node, prop,
strings, nb_controls_max);
if (ret < 0)
return ret;
nb_controls = (unsigned int)ret;
controls = devm_kcalloc(dev, nb_controls,
sizeof(*controls), GFP_KERNEL);
if (!controls)
return -ENOMEM;
for (i = 0; i < nb_controls; i++) {
control_name = devm_kasprintf(dev, GFP_KERNEL,
"%s Switch", strings[i]);
if (!control_name)
return -ENOMEM;
controls[i].iface = SNDRV_CTL_ELEM_IFACE_MIXER;
controls[i].name = control_name;
controls[i].info = snd_soc_dapm_info_pin_switch;
controls[i].get = snd_soc_dapm_get_pin_switch;
controls[i].put = snd_soc_dapm_put_pin_switch;
controls[i].private_value = (unsigned long)strings[i];
}
card->controls = controls;
card->num_controls = nb_controls;
return 0;
}
EXPORT_SYMBOL_GPL(asoc_simple_parse_pin_switches);
int asoc_simple_init_jack(struct snd_soc_card *card,
struct asoc_simple_jack *sjack,
int is_hp, char *prefix,
char *pin)
{
struct device *dev = card->dev;
enum of_gpio_flags flags;
char prop[128];
char *pin_name;
char *gpio_name;
int mask;
int det;
if (!prefix)
prefix = "";
sjack->gpio.gpio = -ENOENT;
if (is_hp) {
snprintf(prop, sizeof(prop), "%shp-det-gpio", prefix);
pin_name = pin ? pin : "Headphones";
gpio_name = "Headphone detection";
mask = SND_JACK_HEADPHONE;
} else {
snprintf(prop, sizeof(prop), "%smic-det-gpio", prefix);
pin_name = pin ? pin : "Mic Jack";
gpio_name = "Mic detection";
mask = SND_JACK_MICROPHONE;
}
det = of_get_named_gpio_flags(dev->of_node, prop, 0, &flags);
if (det == -EPROBE_DEFER)
return -EPROBE_DEFER;
if (gpio_is_valid(det)) {
sjack->pin.pin = pin_name;
sjack->pin.mask = mask;
sjack->gpio.name = gpio_name;
sjack->gpio.report = mask;
sjack->gpio.gpio = det;
sjack->gpio.invert = !!(flags & OF_GPIO_ACTIVE_LOW);
sjack->gpio.debounce_time = 150;
snd_soc_card_jack_new(card, pin_name, mask,
&sjack->jack,
&sjack->pin, 1);
snd_soc_jack_add_gpios(&sjack->jack, 1,
&sjack->gpio);
}
return 0;
}
EXPORT_SYMBOL_GPL(asoc_simple_init_jack);
int asoc_simple_init_priv(struct asoc_simple_priv *priv,
struct link_info *li)
{
struct snd_soc_card *card = simple_priv_to_card(priv);
struct device *dev = simple_priv_to_dev(priv);
struct snd_soc_dai_link *dai_link;
struct simple_dai_props *dai_props;
struct asoc_simple_dai *dais;
struct snd_soc_codec_conf *cconf = NULL;
int i;
dai_props = devm_kcalloc(dev, li->link, sizeof(*dai_props), GFP_KERNEL);
dai_link = devm_kcalloc(dev, li->link, sizeof(*dai_link), GFP_KERNEL);
dais = devm_kcalloc(dev, li->dais, sizeof(*dais), GFP_KERNEL);
if (!dai_props || !dai_link || !dais)
return -ENOMEM;
if (li->conf) {
cconf = devm_kcalloc(dev, li->conf, sizeof(*cconf), GFP_KERNEL);
if (!cconf)
return -ENOMEM;
}
/*
* Use snd_soc_dai_link_component instead of legacy style
* It is codec only. but cpu/platform will be supported in the future.
* see
* soc-core.c :: snd_soc_init_multicodec()
*
* "platform" might be removed
* see
* simple-card-utils.c :: asoc_simple_canonicalize_platform()
*/
for (i = 0; i < li->link; i++) {
dai_link[i].cpus = &dai_props[i].cpus;
dai_link[i].num_cpus = 1;
dai_link[i].codecs = &dai_props[i].codecs;
dai_link[i].num_codecs = 1;
dai_link[i].platforms = &dai_props[i].platforms;
dai_link[i].num_platforms = 1;
}
priv->dai_props = dai_props;
priv->dai_link = dai_link;
priv->dais = dais;
priv->codec_conf = cconf;
card->dai_link = priv->dai_link;
card->num_links = li->link;
card->codec_conf = cconf;
card->num_configs = li->conf;
return 0;
}
EXPORT_SYMBOL_GPL(asoc_simple_init_priv);
/* Module information */
MODULE_AUTHOR("Kuninori Morimoto <kuninori.morimoto.gx@renesas.com>");
MODULE_DESCRIPTION("ALSA SoC Simple Card Utils");
MODULE_LICENSE("GPL v2");