linux-kernel - [PATCH v2 02/37] ALSA: rawmidi: Add ioctl callback to snd_rawmidi_global

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Message-Id: <20230523075358.9672-3-tiwai@suse.de>
Date:   Tue, 23 May 2023 09:53:23 +0200
From:   Takashi Iwai <tiwai@...e.de>
To:     alsa-devel@...a-project.org
Cc:     linux-kernel@...r.kernel.org
Subject: [PATCH v2 02/37] ALSA: rawmidi: Add ioctl callback to snd_rawmidi_global_ops

A new callback, ioctl, is added to snd_rawmidi_global_ops for allowing
the driver to deal with the own ioctls.  This is another preparation
patch for the upcoming UMP support.

Reviewed-by: Jaroslav Kysela <perex@...ex.cz>
Signed-off-by: Takashi Iwai <tiwai@...e.de>
---
 include/sound/rawmidi.h | 2 ++
 sound/core/rawmidi.c    | 7 +++++--
 2 files changed, 7 insertions(+), 2 deletions(-)

diff --git a/include/sound/rawmidi.h b/include/sound/rawmidi.h
index 52b1cbfb2526..84413cfcdcb5 100644
--- a/include/sound/rawmidi.h
+++ b/include/sound/rawmidi.h
@@ -47,6 +47,8 @@ struct snd_rawmidi_global_ops {
 	int (*dev_unregister) (struct snd_rawmidi * rmidi);
 	void (*get_port_info)(struct snd_rawmidi *rmidi, int number,
 			      struct snd_seq_port_info *info);
+	long (*ioctl)(struct snd_rawmidi *rmidi, unsigned int cmd,
+		      void __user *argp);
 };
 
 struct snd_rawmidi_runtime {
diff --git a/sound/core/rawmidi.c b/sound/core/rawmidi.c
index 589b75087d27..ab28cfc1fac8 100644
--- a/sound/core/rawmidi.c
+++ b/sound/core/rawmidi.c
@@ -893,6 +893,7 @@ static int snd_rawmidi_ioctl_status64(struct snd_rawmidi_file *rfile,
 static long snd_rawmidi_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
 {
 	struct snd_rawmidi_file *rfile;
+	struct snd_rawmidi *rmidi;
 	void __user *argp = (void __user *)arg;
 
 	rfile = file->private_data;
@@ -984,8 +985,10 @@ static long snd_rawmidi_ioctl(struct file *file, unsigned int cmd, unsigned long
 		}
 	}
 	default:
-		rmidi_dbg(rfile->rmidi,
-			  "rawmidi: unknown command = 0x%x\n", cmd);
+		rmidi = rfile->rmidi;
+		if (rmidi->ops && rmidi->ops->ioctl)
+			return rmidi->ops->ioctl(rmidi, cmd, argp);
+		rmidi_dbg(rmidi, "rawmidi: unknown command = 0x%x\n", cmd);
 	}
 	return -ENOTTY;
 }
-- 
2.35.3