修改4g拨号为QMI,需要在系统里后台执行quectel-CM

hc

2024-10-22 8ac6c7a54ed1b98d142dce24b11c6de6a1e239a5

 kernel/sound/usb/line6/midibuf.c
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@@ -1,17 +1,14 @@
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+// SPDX-License-Identifier: GPL-2.0-only
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 /*
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  * Line 6 Linux USB driver
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  *
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  * Copyright (C) 2004-2010 Markus Grabner (grabner@icg.tugraz.at)
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- *
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- *	This program is free software; you can redistribute it and/or
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- *	modify it under the terms of the GNU General Public License as
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- *	published by the Free Software Foundation, version 2.
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- *
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  */
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 #include <linux/slab.h>
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 #include "midibuf.h"
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+
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 static int midibuf_message_length(unsigned char code)
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 {
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@@ -24,12 +21,7 @@
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 		message_length = length[(code >> 4) - 8];
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 	} else {
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-		/*
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-		   Note that according to the MIDI specification 0xf2 is
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-		   the "Song Position Pointer", but this is used by Line 6
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-		   to send sysex messages to the host.
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-		 */
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-		static const int length[] = { -1, 2, -1, 2, -1, -1, 1, 1, 1, 1,
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+		static const int length[] = { -1, 2, 2, 2, -1, -1, 1, 1, 1, -1,
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 			1, 1, 1, -1, 1, 1
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 		};
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 		message_length = length[code & 0x0f];
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@@ -129,7 +121,7 @@
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 }
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 int line6_midibuf_read(struct midi_buffer *this, unsigned char *data,
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-		       int length)
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+		       int length, int read_type)
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 {
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 	int bytes_used;
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 	int length1, length2;
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@@ -152,9 +144,22 @@
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 	length1 = this->size - this->pos_read;
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-	/* check MIDI command length */
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 	command = this->buf[this->pos_read];
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+	/*
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+	   PODxt always has status byte lower nibble set to 0010,
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+	   when it means to send 0000, so we correct if here so
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+	   that control/program changes come on channel 1 and
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+	   sysex message status byte is correct
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+	 */
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+	if (read_type == LINE6_MIDIBUF_READ_RX) {
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+		if (command == 0xb2 || command == 0xc2 || command == 0xf2) {
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+			unsigned char fixed = command & 0xf0;
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+			this->buf[this->pos_read] = fixed;
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+			command = fixed;
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+		}
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+	}
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+	/* check MIDI command length */
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 	if (command & 0x80) {
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 		midi_length = midibuf_message_length(command);
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 		this->command_prev = command;