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ALSA: ump: Add ioctls to inquiry UMP EP and Block info via control API

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It'd be convenient to have ioctls to inquiry the UMP Endpoint and UMP
Block information directly via the control API without opening the
rawmidi interface, just like SNDRV_CTL_IOCTL_RAWMIDI_INFO.

This patch extends the rawmidi ioctl handler to support those; new
ioctls, SNDRV_CTL_IOCTL_UMP_ENDPOINT_INFO and
SNDRV_CTL_IOCTL_UMP_BLOCK_INFO, return the snd_ump_endpoint and
snd_ump_block data that is specified by the device field,
respectively.

Suggested-by: Jaroslav Kysela <perex@perex.cz>
Reviewed-by: Jaroslav Kysela <perex@perex.cz>
Link: https://lore.kernel.org/r/20230523075358.9672-6-tiwai@suse.de
Signed-off-by: Takashi Iwai <tiwai@suse.de>
This commit is contained in:
Takashi Iwai 2023-05-23 09:53:26 +02:00
parent 127ae6f6da
commit 30fc139260
2 changed files with 28 additions and 0 deletions
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2
include/uapi/sound/asound.h
View File

@ -1178,6 +1178,8 @@ struct snd_ctl_tlv {
#define SNDRV_CTL_IOCTL_RAWMIDI_INFO _IOWR('U', 0x41, struct snd_rawmidi_info)
#define SNDRV_CTL_IOCTL_RAWMIDI_PREFER_SUBDEVICE _IOW('U', 0x42, int)
#define SNDRV_CTL_IOCTL_UMP_NEXT_DEVICE _IOWR('U', 0x43, int)
#define SNDRV_CTL_IOCTL_UMP_ENDPOINT_INFO _IOWR('U', 0x44, struct snd_ump_endpoint_info)
#define SNDRV_CTL_IOCTL_UMP_BLOCK_INFO _IOWR('U', 0x45, struct snd_ump_block_info)
#define SNDRV_CTL_IOCTL_POWER _IOWR('U', 0xd0, int)
#define SNDRV_CTL_IOCTL_POWER_STATE _IOR('U', 0xd1, int)

26
sound/core/rawmidi.c
View File

@ -1043,6 +1043,28 @@ static int snd_rawmidi_next_device(struct snd_card *card, int __user *argp,
return 0;
}
#if IS_ENABLED(CONFIG_SND_UMP)
/* inquiry of UMP endpoint and block info via control API */
static int snd_rawmidi_call_ump_ioctl(struct snd_card *card, int cmd,
void __user *argp)
{
struct snd_ump_endpoint_info __user *info = argp;
struct snd_rawmidi *rmidi;
int device, ret;
if (get_user(device, &info->device))
return -EFAULT;
mutex_lock(&register_mutex);
rmidi = snd_rawmidi_search(card, device);
if (rmidi && rmidi->ops && rmidi->ops->ioctl)
ret = rmidi->ops->ioctl(rmidi, cmd, argp);
else
ret = -ENXIO;
mutex_unlock(&register_mutex);
return ret;
}
#endif
static int snd_rawmidi_control_ioctl(struct snd_card *card,
struct snd_ctl_file *control,
unsigned int cmd,
@ -1056,6 +1078,10 @@ static int snd_rawmidi_control_ioctl(struct snd_card *card,
#if IS_ENABLED(CONFIG_SND_UMP)
case SNDRV_CTL_IOCTL_UMP_NEXT_DEVICE:
return snd_rawmidi_next_device(card, argp, true);
case SNDRV_CTL_IOCTL_UMP_ENDPOINT_INFO:
return snd_rawmidi_call_ump_ioctl(card, SNDRV_UMP_IOCTL_ENDPOINT_INFO, argp);
case SNDRV_CTL_IOCTL_UMP_BLOCK_INFO:
return snd_rawmidi_call_ump_ioctl(card, SNDRV_UMP_IOCTL_BLOCK_INFO, argp);
#endif
case SNDRV_CTL_IOCTL_RAWMIDI_PREFER_SUBDEVICE:
{