From 8ac6c7a54ed1b98d142dce24b11c6de6a1e239a5 Mon Sep 17 00:00:00 2001
From: hc <hc@nodka.com>
Date: Tue, 22 Oct 2024 10:36:11 +0000
Subject: [PATCH] 修改4g拨号为QMI,需要在系统里后台执行quectel-CM
---
kernel/sound/usb/line6/midibuf.c | 31 ++++++++++++++++++-------------
1 files changed, 18 insertions(+), 13 deletions(-)
diff --git a/kernel/sound/usb/line6/midibuf.c b/kernel/sound/usb/line6/midibuf.c
index c931d48..e7f830f 100644
--- a/kernel/sound/usb/line6/midibuf.c
+++ b/kernel/sound/usb/line6/midibuf.c
@@ -1,17 +1,14 @@
+// SPDX-License-Identifier: GPL-2.0-only
/*
* Line 6 Linux USB driver
*
* Copyright (C) 2004-2010 Markus Grabner (grabner@icg.tugraz.at)
- *
- * This program is free software; you can redistribute it and/or
- * modify it under the terms of the GNU General Public License as
- * published by the Free Software Foundation, version 2.
- *
*/
#include <linux/slab.h>
#include "midibuf.h"
+
static int midibuf_message_length(unsigned char code)
{
@@ -24,12 +21,7 @@
message_length = length[(code >> 4) - 8];
} else {
- /*
- Note that according to the MIDI specification 0xf2 is
- the "Song Position Pointer", but this is used by Line 6
- to send sysex messages to the host.
- */
- static const int length[] = { -1, 2, -1, 2, -1, -1, 1, 1, 1, 1,
+ static const int length[] = { -1, 2, 2, 2, -1, -1, 1, 1, 1, -1,
1, 1, 1, -1, 1, 1
};
message_length = length[code & 0x0f];
@@ -129,7 +121,7 @@
}
int line6_midibuf_read(struct midi_buffer *this, unsigned char *data,
- int length)
+ int length, int read_type)
{
int bytes_used;
int length1, length2;
@@ -152,9 +144,22 @@
length1 = this->size - this->pos_read;
- /* check MIDI command length */
command = this->buf[this->pos_read];
+ /*
+ PODxt always has status byte lower nibble set to 0010,
+ when it means to send 0000, so we correct if here so
+ that control/program changes come on channel 1 and
+ sysex message status byte is correct
+ */
+ if (read_type == LINE6_MIDIBUF_READ_RX) {
+ if (command == 0xb2 || command == 0xc2 || command == 0xf2) {
+ unsigned char fixed = command & 0xf0;
+ this->buf[this->pos_read] = fixed;
+ command = fixed;
+ }
+ }
+ /* check MIDI command length */
if (command & 0x80) {
midi_length = midibuf_message_length(command);
this->command_prev = command;
--
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