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2024-02-20 ea08eeccae9297f7aabd2ef7f0c2517ac4549acc 
 kernel/sound/core/rawmidi.c
....@@ -1,22 +1,7 @@
1
+// SPDX-License-Identifier: GPL-2.0-or-later
12 /*
23  *  Abstract layer for MIDI v1.0 stream
34  *  Copyright (c) by Jaroslav Kysela <perex@perex.cz>
4
- *
5
- *
6
- *   This program is free software; you can redistribute it and/or modify
7
- *   it under the terms of the GNU General Public License as published by
8
- *   the Free Software Foundation; either version 2 of the License, or
9
- *   (at your option) any later version.
10
- *
11
- *   This program is distributed in the hope that it will be useful,
12
- *   but WITHOUT ANY WARRANTY; without even the implied warranty of
13
- *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
14
- *   GNU General Public License for more details.
15
- *
16
- *   You should have received a copy of the GNU General Public License
17
- *   along with this program; if not, write to the Free Software
18
- *   Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307 USA
19
- *
205  */
216 
227 #include <sound/core.h>
....@@ -50,7 +35,7 @@
5035 MODULE_PARM_DESC(amidi_map, "Raw MIDI device number assigned to 2nd OSS device.");
5136 #endif /* CONFIG_SND_OSSEMUL */
5237 
53
-static int snd_rawmidi_free(struct snd_rawmidi *rawmidi);
38
+static int snd_rawmidi_free(struct snd_rawmidi *rmidi);
5439 static int snd_rawmidi_dev_free(struct snd_device *device);
5540 static int snd_rawmidi_dev_register(struct snd_device *device);
5641 static int snd_rawmidi_dev_disconnect(struct snd_device *device);
....@@ -64,6 +49,29 @@
6449 	dev_warn(&(rmidi)->dev, fmt, ##args)
6550 #define rmidi_dbg(rmidi, fmt, args...) \
6651 	dev_dbg(&(rmidi)->dev, fmt, ##args)
52
+
53
+struct snd_rawmidi_status32 {
54
+	s32 stream;
55
+	s32 tstamp_sec;			/* Timestamp */
56
+	s32 tstamp_nsec;
57
+	u32 avail;			/* available bytes */
58
+	u32 xruns;			/* count of overruns since last status (in bytes) */
59
+	unsigned char reserved[16];	/* reserved for future use */
60
+};
61
+
62
+#define SNDRV_RAWMIDI_IOCTL_STATUS32	_IOWR('W', 0x20, struct snd_rawmidi_status32)
63
+
64
+struct snd_rawmidi_status64 {
65
+	int stream;
66
+	u8 rsvd[4];			/* alignment */
67
+	s64 tstamp_sec;			/* Timestamp */
68
+	s64 tstamp_nsec;
69
+	size_t avail;			/* available bytes */
70
+	size_t xruns;			/* count of overruns since last status (in bytes) */
71
+	unsigned char reserved[16];	/* reserved for future use */
72
+};
73
+
74
+#define SNDRV_RAWMIDI_IOCTL_STATUS64	_IOWR('W', 0x20, struct snd_rawmidi_status64)
6775 
6876 static struct snd_rawmidi *snd_rawmidi_search(struct snd_card *card, int device)
6977 {
....@@ -262,7 +270,7 @@
262270 {
263271 	struct snd_rawmidi_substream *substream;
264272 	struct snd_rawmidi_str *s = &rmidi->streams[stream];
265
-	static unsigned int info_flags[2] = {
273
+	static const unsigned int info_flags[2] = {
266274 		[SNDRV_RAWMIDI_STREAM_OUTPUT] = SNDRV_RAWMIDI_INFO_OUTPUT,
267275 		[SNDRV_RAWMIDI_STREAM_INPUT] = SNDRV_RAWMIDI_INFO_INPUT,
268276 	};
....@@ -403,7 +411,7 @@
403411 	if ((file->f_flags & O_APPEND) && !(file->f_flags & O_NONBLOCK))
404412 		return -EINVAL;		/* invalid combination */
405413 
406
-	err = nonseekable_open(inode, file);
414
+	err = stream_open(inode, file);
407415 	if (err < 0)
408416 		return err;
409417 
....@@ -718,7 +726,7 @@
718726 EXPORT_SYMBOL(snd_rawmidi_input_params);
719727 
720728 static int snd_rawmidi_output_status(struct snd_rawmidi_substream *substream,
721
-				     struct snd_rawmidi_status *status)
729
+				     struct snd_rawmidi_status64 *status)
722730 {
723731 	struct snd_rawmidi_runtime *runtime = substream->runtime;
724732 
....@@ -731,7 +739,7 @@
731739 }
732740 
733741 static int snd_rawmidi_input_status(struct snd_rawmidi_substream *substream,
734
-				    struct snd_rawmidi_status *status)
742
+				    struct snd_rawmidi_status64 *status)
735743 {
736744 	struct snd_rawmidi_runtime *runtime = substream->runtime;
737745 
....@@ -742,6 +750,80 @@
742750 	status->xruns = runtime->xruns;
743751 	runtime->xruns = 0;
744752 	spin_unlock_irq(&runtime->lock);
753
+	return 0;
754
+}
755
+
756
+static int snd_rawmidi_ioctl_status32(struct snd_rawmidi_file *rfile,
757
+				      struct snd_rawmidi_status32 __user *argp)
758
+{
759
+	int err = 0;
760
+	struct snd_rawmidi_status32 __user *status = argp;
761
+	struct snd_rawmidi_status32 status32;
762
+	struct snd_rawmidi_status64 status64;
763
+
764
+	if (copy_from_user(&status32, argp,
765
+			   sizeof(struct snd_rawmidi_status32)))
766
+		return -EFAULT;
767
+
768
+	switch (status32.stream) {
769
+	case SNDRV_RAWMIDI_STREAM_OUTPUT:
770
+		if (rfile->output == NULL)
771
+			return -EINVAL;
772
+		err = snd_rawmidi_output_status(rfile->output, &status64);
773
+		break;
774
+	case SNDRV_RAWMIDI_STREAM_INPUT:
775
+		if (rfile->input == NULL)
776
+			return -EINVAL;
777
+		err = snd_rawmidi_input_status(rfile->input, &status64);
778
+		break;
779
+	default:
780
+		return -EINVAL;
781
+	}
782
+	if (err < 0)
783
+		return err;
784
+
785
+	status32 = (struct snd_rawmidi_status32) {
786
+		.stream = status64.stream,
787
+		.tstamp_sec = status64.tstamp_sec,
788
+		.tstamp_nsec = status64.tstamp_nsec,
789
+		.avail = status64.avail,
790
+		.xruns = status64.xruns,
791
+	};
792
+
793
+	if (copy_to_user(status, &status32, sizeof(*status)))
794
+		return -EFAULT;
795
+
796
+	return 0;
797
+}
798
+
799
+static int snd_rawmidi_ioctl_status64(struct snd_rawmidi_file *rfile,
800
+				      struct snd_rawmidi_status64 __user *argp)
801
+{
802
+	int err = 0;
803
+	struct snd_rawmidi_status64 status;
804
+
805
+	if (copy_from_user(&status, argp, sizeof(struct snd_rawmidi_status64)))
806
+		return -EFAULT;
807
+
808
+	switch (status.stream) {
809
+	case SNDRV_RAWMIDI_STREAM_OUTPUT:
810
+		if (rfile->output == NULL)
811
+			return -EINVAL;
812
+		err = snd_rawmidi_output_status(rfile->output, &status);
813
+		break;
814
+	case SNDRV_RAWMIDI_STREAM_INPUT:
815
+		if (rfile->input == NULL)
816
+			return -EINVAL;
817
+		err = snd_rawmidi_input_status(rfile->input, &status);
818
+		break;
819
+	default:
820
+		return -EINVAL;
821
+	}
822
+	if (err < 0)
823
+		return err;
824
+	if (copy_to_user(argp, &status,
825
+			 sizeof(struct snd_rawmidi_status64)))
826
+		return -EFAULT;
745827 	return 0;
746828 }
747829 
....@@ -791,33 +873,10 @@
791873 			return -EINVAL;
792874 		}
793875 	}
794
-	case SNDRV_RAWMIDI_IOCTL_STATUS:
795
-	{
796
-		int err = 0;
797
-		struct snd_rawmidi_status status;
798
-
799
-		if (copy_from_user(&status, argp, sizeof(struct snd_rawmidi_status)))
800
-			return -EFAULT;
801
-		switch (status.stream) {
802
-		case SNDRV_RAWMIDI_STREAM_OUTPUT:
803
-			if (rfile->output == NULL)
804
-				return -EINVAL;
805
-			err = snd_rawmidi_output_status(rfile->output, &status);
806
-			break;
807
-		case SNDRV_RAWMIDI_STREAM_INPUT:
808
-			if (rfile->input == NULL)
809
-				return -EINVAL;
810
-			err = snd_rawmidi_input_status(rfile->input, &status);
811
-			break;
812
-		default:
813
-			return -EINVAL;
814
-		}
815
-		if (err < 0)
816
-			return err;
817
-		if (copy_to_user(argp, &status, sizeof(struct snd_rawmidi_status)))
818
-			return -EFAULT;
819
-		return 0;
820
-	}
876
+	case SNDRV_RAWMIDI_IOCTL_STATUS32:
877
+		return snd_rawmidi_ioctl_status32(rfile, argp);
878
+	case SNDRV_RAWMIDI_IOCTL_STATUS64:
879
+		return snd_rawmidi_ioctl_status64(rfile, argp);
821880 	case SNDRV_RAWMIDI_IOCTL_DROP:
822881 	{
823882 		int val;
....@@ -1271,6 +1330,28 @@
12711330 }
12721331 EXPORT_SYMBOL(snd_rawmidi_transmit);
12731332 
1333
+/**
1334
+ * snd_rawmidi_proceed - Discard the all pending bytes and proceed
1335
+ * @substream: rawmidi substream
1336
+ *
1337
+ * Return: the number of discarded bytes
1338
+ */
1339
+int snd_rawmidi_proceed(struct snd_rawmidi_substream *substream)
1340
+{
1341
+	struct snd_rawmidi_runtime *runtime = substream->runtime;
1342
+	unsigned long flags;
1343
+	int count = 0;
1344
+
1345
+	spin_lock_irqsave(&runtime->lock, flags);
1346
+	if (runtime->avail < runtime->buffer_size) {
1347
+		count = runtime->buffer_size - runtime->avail;
1348
+		__snd_rawmidi_transmit_ack(substream, count);
1349
+	}
1350
+	spin_unlock_irqrestore(&runtime->lock, flags);
1351
+	return count;
1352
+}
1353
+EXPORT_SYMBOL(snd_rawmidi_proceed);
1354
+
12741355 static long snd_rawmidi_kernel_write1(struct snd_rawmidi_substream *substream,
12751356 				      const unsigned char __user *userbuf,
12761357 				      const unsigned char *kernelbuf,
....@@ -1584,7 +1665,7 @@
15841665 {
15851666 	struct snd_rawmidi *rmidi;
15861667 	int err;
1587
-	static struct snd_device_ops ops = {
1668
+	static const struct snd_device_ops ops = {
15881669 		.dev_free = snd_rawmidi_dev_free,
15891670 		.dev_register = snd_rawmidi_dev_register,
15901671 		.dev_disconnect = snd_rawmidi_dev_disconnect,
....@@ -1655,10 +1736,8 @@
16551736 
16561737 	snd_info_free_entry(rmidi->proc_entry);
16571738 	rmidi->proc_entry = NULL;
1658
-	mutex_lock(&register_mutex);
16591739 	if (rmidi->ops && rmidi->ops->dev_unregister)
16601740 		rmidi->ops->dev_unregister(rmidi);
1661
-	mutex_unlock(&register_mutex);
16621741 
16631742 	snd_rawmidi_free_substreams(&rmidi->streams[SNDRV_RAWMIDI_STREAM_INPUT]);
16641743 	snd_rawmidi_free_substreams(&rmidi->streams[SNDRV_RAWMIDI_STREAM_OUTPUT]);