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ASoC: simple-card-utils: add asoc_simple_parse_pin_switches() 

This function is a helper that permits to create pin switch controls for
a list of widgets whose names are listed in the PREFIX "pin-switches"
devicetree property.

Signed-off-by: Paul Cercueil <paul@crapouillou.net>
Signed-off-by: Mark Brown <broonie@kernel.org>
This commit is contained in:
Paul Cercueil 2019-04-26 04:25:49 +02:00 committed by Mark Brown
parent fb45befa7e
commit 90194281ee
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2 changed files with 59 additions and 0 deletions
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2
include/sound/simple_card_utils.h
View File

@ -133,6 +133,8 @@ int asoc_simple_parse_routing(struct snd_soc_card *card,
char *prefix);
int asoc_simple_parse_widgets(struct snd_soc_card *card,
char *prefix);
int asoc_simple_parse_pin_switches(struct snd_soc_card *card,
char *prefix);
int asoc_simple_init_jack(struct snd_soc_card *card,
struct asoc_simple_jack *sjack,

57
sound/soc/generic/simple-card-utils.c
View File

@ -430,6 +430,63 @@ int asoc_simple_parse_widgets(struct snd_soc_card *card,
}
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)