From 90194281ee8b01fc5a223a12ac90006ae98862c4 Mon Sep 17 00:00:00 2001 From: Paul Cercueil Date: Fri, 26 Apr 2019 04:25:49 +0200 Subject: 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 Signed-off-by: Mark Brown --- sound/soc/generic/simple-card-utils.c | 57 +++++++++++++++++++++++++++++++++++ 1 file changed, 57 insertions(+) (limited to 'sound/soc/generic') diff --git a/sound/soc/generic/simple-card-utils.c b/sound/soc/generic/simple-card-utils.c index db1458a19985..f4c6375d11c7 100644 --- a/sound/soc/generic/simple-card-utils.c +++ b/sound/soc/generic/simple-card-utils.c @@ -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) -- cgit v1.2.3-59-g8ed1b