linux-kernel - [PATCH v2 05/37] ALSA: ump: Add ioctls to inquiry UMP EP and Block info via control API

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Date:   Tue, 23 May 2023 09:53:26 +0200
From:   Takashi Iwai <tiwai@...e.de>
To:     alsa-devel@...a-project.org
Cc:     linux-kernel@...r.kernel.org
Subject: [PATCH v2 05/37] ALSA: ump: Add ioctls to inquiry UMP EP and Block info via control API

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@...ex.cz>
Reviewed-by: Jaroslav Kysela <perex@...ex.cz>
Signed-off-by: Takashi Iwai <tiwai@...e.de>
---
 include/uapi/sound/asound.h |  2 ++
 sound/core/rawmidi.c        | 26 ++++++++++++++++++++++++++
 2 files changed, 28 insertions(+)

diff --git a/include/uapi/sound/asound.h b/include/uapi/sound/asound.h
index 1e4a21036109..5c5f41dd4001 100644
--- a/include/uapi/sound/asound.h
+++ b/include/uapi/sound/asound.h
@@ -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)
 
diff --git a/sound/core/rawmidi.c b/sound/core/rawmidi.c
index 9936ed282b85..ffb5b58105f4 100644
--- a/sound/core/rawmidi.c
+++ b/sound/core/rawmidi.c
@@ -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:
 	{
-- 
2.35.3