| Message ID | 20240425215125.29761-34-quic_wcheng@quicinc.com |
|---|---|
| State | New |
| Headers | show |
| Series | Introduce QC USB SND audio offloading support | expand |
Hi Amadeusz, On 4/26/2024 6:26 AM, Amadeusz Sławiński wrote: > On 4/25/2024 11:51 PM, Wesley Cheng wrote: >> Expose API for creation of a jack control for notifying of available >> devices that are plugged in/discovered, and that support offloading. >> This >> allows for control names to be standardized across implementations of USB >> audio offloading. >> >> Signed-off-by: Wesley Cheng <quic_wcheng@quicinc.com> >> --- > > (...) > >> /* SOC USB sound kcontrols */ >> +/** >> + * snd_soc_usb_setup_offload_jack() - Create USB offloading jack >> + * @component: USB DPCM backend DAI component >> + * @jack: jack structure to create >> + * >> + * Creates a jack device for notifying userspace of the availability >> + * of an offload capable device. >> + * >> + * Returns 0 on success, negative on error. >> + * >> + */ >> +int snd_soc_usb_setup_offload_jack(struct snd_soc_component *component, >> + struct snd_soc_jack *jack) >> +{ >> + int ret; >> + >> + ret = snd_soc_card_jack_new(component->card, "USB Offload >> Playback Jack", >> + SND_JACK_HEADPHONE, jack); >> + if (ret < 0) { >> + dev_err(component->card->dev, "Unable to add USB offload >> jack\n"); >> + return ret; >> + } >> + >> + ret = snd_soc_component_set_jack(component, jack, NULL); >> + if (ret) { >> + dev_warn(component->card->dev, "Failed to set jack: %d\n", ret); >> + return ret; >> + } >> + >> + return 0; >> +} >> +EXPORT_SYMBOL_GPL(snd_soc_usb_setup_offload_jack); >> + >> static int snd_soc_usb_get_offload_card_status(struct snd_kcontrol >> *kcontrol, >> struct snd_ctl_elem_value *ucontrol) >> { >> > > I'm not sure if this should be handled in generic USB API, this feels > like something that should be handled in specific device driver side, > like all users currently do. > In some of the previous comments, it was mentioned that maybe it was better to have more consistent/defined naming across devices that do have support for audio offload. Initially, I did have these within our vendor specific ASoC platform driver also. > Anyway I think there should also be some function that tears jack down, > by calling: > snd_soc_component_set_jack(component, NULL, NULL); > so it can get cleaned up properly? I can add that. I didn't realize there were some situations where maybe components would want to disable the jack. I will leave the cleanup part to ASoC when the platform card is removed. Thanks Wesley Cheng
diff --git a/include/sound/soc-usb.h b/include/sound/soc-usb.h index 5e6076f65a41..3137f538270f 100644 --- a/include/sound/soc-usb.h +++ b/include/sound/soc-usb.h @@ -6,6 +6,8 @@ #ifndef __LINUX_SND_SOC_USB_H #define __LINUX_SND_SOC_USB_H +#include <sound/soc.h> + enum snd_soc_usb_kctl { SND_SOC_USB_KCTL_CARD_ROUTE, SND_SOC_USB_KCTL_PCM_ROUTE, @@ -88,6 +90,8 @@ int snd_soc_usb_prepare_session(struct snd_soc_usb *usb, int card_idx, int pcm_i int snd_soc_usb_shutdown_session(struct snd_soc_usb *usb, int session_id); int snd_soc_usb_set_session_state(struct snd_soc_usb *usb, int session_id, enum snd_soc_usb_dai_state state); +int snd_soc_usb_setup_offload_jack(struct snd_soc_component *component, + struct snd_soc_jack *jack); struct snd_soc_usb *snd_soc_usb_allocate_port(struct snd_soc_component *component, int num_streams, void *data); @@ -143,6 +147,12 @@ static inline int snd_soc_usb_set_session_state(struct snd_soc_usb *usb, return -EINVAL; } +static inline int snd_soc_usb_setup_offload_jack(struct snd_soc_component *component, + struct snd_soc_jack *jack) +{ + return -ENODEV; +} + static inline struct snd_soc_usb *snd_soc_usb_allocate_port( struct snd_soc_component *component, int num_streams, void *data) diff --git a/sound/soc/soc-usb.c b/sound/soc/soc-usb.c index e291f146a79d..27c76a33da32 100644 --- a/sound/soc/soc-usb.c +++ b/sound/soc/soc-usb.c @@ -4,8 +4,10 @@ */ #include <linux/of.h> #include <linux/usb.h> -#include <sound/soc.h> + +#include <sound/jack.h> #include <sound/soc-usb.h> + #include "../usb/card.h" static DEFINE_MUTEX(ctx_mutex); @@ -42,6 +44,39 @@ static struct snd_soc_usb *snd_soc_find_usb_ctx(struct device_node *node) } /* SOC USB sound kcontrols */ +/** + * snd_soc_usb_setup_offload_jack() - Create USB offloading jack + * @component: USB DPCM backend DAI component + * @jack: jack structure to create + * + * Creates a jack device for notifying userspace of the availability + * of an offload capable device. + * + * Returns 0 on success, negative on error. + * + */ +int snd_soc_usb_setup_offload_jack(struct snd_soc_component *component, + struct snd_soc_jack *jack) +{ + int ret; + + ret = snd_soc_card_jack_new(component->card, "USB Offload Playback Jack", + SND_JACK_HEADPHONE, jack); + if (ret < 0) { + dev_err(component->card->dev, "Unable to add USB offload jack\n"); + return ret; + } + + ret = snd_soc_component_set_jack(component, jack, NULL); + if (ret) { + dev_warn(component->card->dev, "Failed to set jack: %d\n", ret); + return ret; + } + + return 0; +} +EXPORT_SYMBOL_GPL(snd_soc_usb_setup_offload_jack); + static int snd_soc_usb_get_offload_card_status(struct snd_kcontrol *kcontrol, struct snd_ctl_elem_value *ucontrol) {
Expose API for creation of a jack control for notifying of available devices that are plugged in/discovered, and that support offloading. This allows for control names to be standardized across implementations of USB audio offloading. Signed-off-by: Wesley Cheng <quic_wcheng@quicinc.com> --- include/sound/soc-usb.h | 10 ++++++++++ sound/soc/soc-usb.c | 37 ++++++++++++++++++++++++++++++++++++- 2 files changed, 46 insertions(+), 1 deletion(-)