Markus Grabner | 705ecec | 2009-02-27 19:43:04 -0800 | [diff] [blame] | 1 | /* |
Markus Grabner | e1a164d | 2010-08-23 01:08:25 +0200 | [diff] [blame] | 2 | * Line6 Linux USB driver - 0.9.1beta |
Markus Grabner | 705ecec | 2009-02-27 19:43:04 -0800 | [diff] [blame] | 3 | * |
Markus Grabner | 1027f476 | 2010-08-12 01:35:30 +0200 | [diff] [blame] | 4 | * Copyright (C) 2004-2010 Markus Grabner (grabner@icg.tugraz.at) |
Markus Grabner | 705ecec | 2009-02-27 19:43:04 -0800 | [diff] [blame] | 5 | * |
| 6 | * This program is free software; you can redistribute it and/or |
| 7 | * modify it under the terms of the GNU General Public License as |
| 8 | * published by the Free Software Foundation, version 2. |
| 9 | * |
| 10 | */ |
| 11 | |
Markus Grabner | 705ecec | 2009-02-27 19:43:04 -0800 | [diff] [blame] | 12 | #include <linux/slab.h> |
| 13 | |
| 14 | #include "midibuf.h" |
| 15 | |
Greg Kroah-Hartman | b702ed25 | 2009-02-27 20:45:03 -0800 | [diff] [blame] | 16 | static int midibuf_message_length(unsigned char code) |
Markus Grabner | 705ecec | 2009-02-27 19:43:04 -0800 | [diff] [blame] | 17 | { |
Greg Kroah-Hartman | ce9b490 | 2009-02-27 22:43:11 -0800 | [diff] [blame] | 18 | if (code < 0x80) |
Markus Grabner | 705ecec | 2009-02-27 19:43:04 -0800 | [diff] [blame] | 19 | return -1; |
Greg Kroah-Hartman | ce9b490 | 2009-02-27 22:43:11 -0800 | [diff] [blame] | 20 | else if (code < 0xf0) { |
Markus Grabner | 705ecec | 2009-02-27 19:43:04 -0800 | [diff] [blame] | 21 | static const int length[] = { 3, 3, 3, 3, 2, 2, 3 }; |
| 22 | return length[(code >> 4) - 8]; |
Greg Kroah-Hartman | ce9b490 | 2009-02-27 22:43:11 -0800 | [diff] [blame] | 23 | } else { |
Markus Grabner | 705ecec | 2009-02-27 19:43:04 -0800 | [diff] [blame] | 24 | /* |
Markus Grabner | e1a164d | 2010-08-23 01:08:25 +0200 | [diff] [blame] | 25 | Note that according to the MIDI specification 0xf2 is |
| 26 | the "Song Position Pointer", but this is used by Line6 |
| 27 | to send sysex messages to the host. |
| 28 | */ |
Greg Kroah-Hartman | ce9b490 | 2009-02-27 22:43:11 -0800 | [diff] [blame] | 29 | static const int length[] = { -1, 2, -1, 2, -1, -1, 1, 1, 1, 1, |
Markus Grabner | e1a164d | 2010-08-23 01:08:25 +0200 | [diff] [blame] | 30 | 1, 1, 1, -1, 1, 1 |
| 31 | }; |
Markus Grabner | 705ecec | 2009-02-27 19:43:04 -0800 | [diff] [blame] | 32 | return length[code & 0x0f]; |
| 33 | } |
| 34 | } |
| 35 | |
Stefan Hajnoczi | 269edc8 | 2013-01-11 23:08:09 +0100 | [diff] [blame] | 36 | static int midibuf_is_empty(struct midi_buffer *this) |
Markus Grabner | 705ecec | 2009-02-27 19:43:04 -0800 | [diff] [blame] | 37 | { |
| 38 | return (this->pos_read == this->pos_write) && !this->full; |
| 39 | } |
| 40 | |
Stefan Hajnoczi | 269edc8 | 2013-01-11 23:08:09 +0100 | [diff] [blame] | 41 | static int midibuf_is_full(struct midi_buffer *this) |
Markus Grabner | 705ecec | 2009-02-27 19:43:04 -0800 | [diff] [blame] | 42 | { |
| 43 | return this->full; |
| 44 | } |
| 45 | |
Stefan Hajnoczi | 269edc8 | 2013-01-11 23:08:09 +0100 | [diff] [blame] | 46 | void line6_midibuf_reset(struct midi_buffer *this) |
Markus Grabner | 1027f476 | 2010-08-12 01:35:30 +0200 | [diff] [blame] | 47 | { |
| 48 | this->pos_read = this->pos_write = this->full = 0; |
| 49 | this->command_prev = -1; |
| 50 | } |
| 51 | |
Stefan Hajnoczi | 269edc8 | 2013-01-11 23:08:09 +0100 | [diff] [blame] | 52 | int line6_midibuf_init(struct midi_buffer *this, int size, int split) |
Markus Grabner | 1027f476 | 2010-08-12 01:35:30 +0200 | [diff] [blame] | 53 | { |
| 54 | this->buf = kmalloc(size, GFP_KERNEL); |
| 55 | |
| 56 | if (this->buf == NULL) |
| 57 | return -ENOMEM; |
| 58 | |
| 59 | this->size = size; |
| 60 | this->split = split; |
| 61 | line6_midibuf_reset(this); |
| 62 | return 0; |
| 63 | } |
| 64 | |
Stefan Hajnoczi | 269edc8 | 2013-01-11 23:08:09 +0100 | [diff] [blame] | 65 | void line6_midibuf_status(struct midi_buffer *this) |
Markus Grabner | 1027f476 | 2010-08-12 01:35:30 +0200 | [diff] [blame] | 66 | { |
Stefan Hajnoczi | b3a24fc | 2012-11-11 13:24:40 +0100 | [diff] [blame] | 67 | pr_debug("midibuf size=%d split=%d pos_read=%d pos_write=%d full=%d command_prev=%02x\n", |
| 68 | this->size, this->split, this->pos_read, this->pos_write, |
| 69 | this->full, this->command_prev); |
Markus Grabner | 1027f476 | 2010-08-12 01:35:30 +0200 | [diff] [blame] | 70 | } |
| 71 | |
Stefan Hajnoczi | 269edc8 | 2013-01-11 23:08:09 +0100 | [diff] [blame] | 72 | int line6_midibuf_bytes_free(struct midi_buffer *this) |
Markus Grabner | 705ecec | 2009-02-27 19:43:04 -0800 | [diff] [blame] | 73 | { |
| 74 | return |
Markus Grabner | e1a164d | 2010-08-23 01:08:25 +0200 | [diff] [blame] | 75 | midibuf_is_full(this) ? |
| 76 | 0 : |
| 77 | (this->pos_read - this->pos_write + this->size - 1) % this->size + |
| 78 | 1; |
Markus Grabner | 705ecec | 2009-02-27 19:43:04 -0800 | [diff] [blame] | 79 | } |
| 80 | |
Stefan Hajnoczi | 269edc8 | 2013-01-11 23:08:09 +0100 | [diff] [blame] | 81 | int line6_midibuf_bytes_used(struct midi_buffer *this) |
Markus Grabner | 705ecec | 2009-02-27 19:43:04 -0800 | [diff] [blame] | 82 | { |
| 83 | return |
Markus Grabner | e1a164d | 2010-08-23 01:08:25 +0200 | [diff] [blame] | 84 | midibuf_is_empty(this) ? |
| 85 | 0 : |
| 86 | (this->pos_write - this->pos_read + this->size - 1) % this->size + |
| 87 | 1; |
Markus Grabner | 705ecec | 2009-02-27 19:43:04 -0800 | [diff] [blame] | 88 | } |
| 89 | |
Stefan Hajnoczi | 269edc8 | 2013-01-11 23:08:09 +0100 | [diff] [blame] | 90 | int line6_midibuf_write(struct midi_buffer *this, unsigned char *data, |
Markus Grabner | e1a164d | 2010-08-23 01:08:25 +0200 | [diff] [blame] | 91 | int length) |
Markus Grabner | 705ecec | 2009-02-27 19:43:04 -0800 | [diff] [blame] | 92 | { |
| 93 | int bytes_free; |
| 94 | int length1, length2; |
| 95 | int skip_active_sense = 0; |
| 96 | |
Greg Kroah-Hartman | ce9b490 | 2009-02-27 22:43:11 -0800 | [diff] [blame] | 97 | if (midibuf_is_full(this) || (length <= 0)) |
Markus Grabner | 705ecec | 2009-02-27 19:43:04 -0800 | [diff] [blame] | 98 | return 0; |
| 99 | |
| 100 | /* skip trailing active sense */ |
Greg Kroah-Hartman | ce9b490 | 2009-02-27 22:43:11 -0800 | [diff] [blame] | 101 | if (data[length - 1] == 0xfe) { |
Markus Grabner | 705ecec | 2009-02-27 19:43:04 -0800 | [diff] [blame] | 102 | --length; |
| 103 | skip_active_sense = 1; |
| 104 | } |
| 105 | |
Markus Grabner | 1027f476 | 2010-08-12 01:35:30 +0200 | [diff] [blame] | 106 | bytes_free = line6_midibuf_bytes_free(this); |
Markus Grabner | 705ecec | 2009-02-27 19:43:04 -0800 | [diff] [blame] | 107 | |
Greg Kroah-Hartman | ce9b490 | 2009-02-27 22:43:11 -0800 | [diff] [blame] | 108 | if (length > bytes_free) |
Markus Grabner | 705ecec | 2009-02-27 19:43:04 -0800 | [diff] [blame] | 109 | length = bytes_free; |
| 110 | |
Greg Kroah-Hartman | ce9b490 | 2009-02-27 22:43:11 -0800 | [diff] [blame] | 111 | if (length > 0) { |
Markus Grabner | 705ecec | 2009-02-27 19:43:04 -0800 | [diff] [blame] | 112 | length1 = this->size - this->pos_write; |
| 113 | |
Greg Kroah-Hartman | ce9b490 | 2009-02-27 22:43:11 -0800 | [diff] [blame] | 114 | if (length < length1) { |
Markus Grabner | 705ecec | 2009-02-27 19:43:04 -0800 | [diff] [blame] | 115 | /* no buffer wraparound */ |
| 116 | memcpy(this->buf + this->pos_write, data, length); |
| 117 | this->pos_write += length; |
Greg Kroah-Hartman | ce9b490 | 2009-02-27 22:43:11 -0800 | [diff] [blame] | 118 | } else { |
Markus Grabner | 705ecec | 2009-02-27 19:43:04 -0800 | [diff] [blame] | 119 | /* buffer wraparound */ |
| 120 | length2 = length - length1; |
| 121 | memcpy(this->buf + this->pos_write, data, length1); |
| 122 | memcpy(this->buf, data + length1, length2); |
| 123 | this->pos_write = length2; |
| 124 | } |
| 125 | |
Greg Kroah-Hartman | ce9b490 | 2009-02-27 22:43:11 -0800 | [diff] [blame] | 126 | if (this->pos_write == this->pos_read) |
Markus Grabner | 705ecec | 2009-02-27 19:43:04 -0800 | [diff] [blame] | 127 | this->full = 1; |
| 128 | } |
| 129 | |
| 130 | return length + skip_active_sense; |
| 131 | } |
| 132 | |
Stefan Hajnoczi | 269edc8 | 2013-01-11 23:08:09 +0100 | [diff] [blame] | 133 | int line6_midibuf_read(struct midi_buffer *this, unsigned char *data, |
| 134 | int length) |
Markus Grabner | 705ecec | 2009-02-27 19:43:04 -0800 | [diff] [blame] | 135 | { |
| 136 | int bytes_used; |
| 137 | int length1, length2; |
| 138 | int command; |
| 139 | int midi_length; |
| 140 | int repeat = 0; |
| 141 | int i; |
| 142 | |
Greg Kroah-Hartman | ce9b490 | 2009-02-27 22:43:11 -0800 | [diff] [blame] | 143 | /* we need to be able to store at least a 3 byte MIDI message */ |
| 144 | if (length < 3) |
| 145 | return -EINVAL; |
Markus Grabner | 705ecec | 2009-02-27 19:43:04 -0800 | [diff] [blame] | 146 | |
Greg Kroah-Hartman | ce9b490 | 2009-02-27 22:43:11 -0800 | [diff] [blame] | 147 | if (midibuf_is_empty(this)) |
Markus Grabner | 705ecec | 2009-02-27 19:43:04 -0800 | [diff] [blame] | 148 | return 0; |
| 149 | |
Markus Grabner | 1027f476 | 2010-08-12 01:35:30 +0200 | [diff] [blame] | 150 | bytes_used = line6_midibuf_bytes_used(this); |
Markus Grabner | 705ecec | 2009-02-27 19:43:04 -0800 | [diff] [blame] | 151 | |
Greg Kroah-Hartman | ce9b490 | 2009-02-27 22:43:11 -0800 | [diff] [blame] | 152 | if (length > bytes_used) |
Markus Grabner | 705ecec | 2009-02-27 19:43:04 -0800 | [diff] [blame] | 153 | length = bytes_used; |
| 154 | |
| 155 | length1 = this->size - this->pos_read; |
| 156 | |
| 157 | /* check MIDI command length */ |
| 158 | command = this->buf[this->pos_read]; |
| 159 | |
Greg Kroah-Hartman | ce9b490 | 2009-02-27 22:43:11 -0800 | [diff] [blame] | 160 | if (command & 0x80) { |
Markus Grabner | 705ecec | 2009-02-27 19:43:04 -0800 | [diff] [blame] | 161 | midi_length = midibuf_message_length(command); |
| 162 | this->command_prev = command; |
Greg Kroah-Hartman | ce9b490 | 2009-02-27 22:43:11 -0800 | [diff] [blame] | 163 | } else { |
| 164 | if (this->command_prev > 0) { |
Markus Grabner | e1a164d | 2010-08-23 01:08:25 +0200 | [diff] [blame] | 165 | int midi_length_prev = |
| 166 | midibuf_message_length(this->command_prev); |
Markus Grabner | 705ecec | 2009-02-27 19:43:04 -0800 | [diff] [blame] | 167 | |
Greg Kroah-Hartman | ce9b490 | 2009-02-27 22:43:11 -0800 | [diff] [blame] | 168 | if (midi_length_prev > 0) { |
Markus Grabner | 705ecec | 2009-02-27 19:43:04 -0800 | [diff] [blame] | 169 | midi_length = midi_length_prev - 1; |
| 170 | repeat = 1; |
Greg Kroah-Hartman | ce9b490 | 2009-02-27 22:43:11 -0800 | [diff] [blame] | 171 | } else |
Markus Grabner | 705ecec | 2009-02-27 19:43:04 -0800 | [diff] [blame] | 172 | midi_length = -1; |
Greg Kroah-Hartman | ce9b490 | 2009-02-27 22:43:11 -0800 | [diff] [blame] | 173 | } else |
Markus Grabner | 705ecec | 2009-02-27 19:43:04 -0800 | [diff] [blame] | 174 | midi_length = -1; |
| 175 | } |
| 176 | |
Greg Kroah-Hartman | ce9b490 | 2009-02-27 22:43:11 -0800 | [diff] [blame] | 177 | if (midi_length < 0) { |
Markus Grabner | 705ecec | 2009-02-27 19:43:04 -0800 | [diff] [blame] | 178 | /* search for end of message */ |
Greg Kroah-Hartman | ce9b490 | 2009-02-27 22:43:11 -0800 | [diff] [blame] | 179 | if (length < length1) { |
Markus Grabner | 705ecec | 2009-02-27 19:43:04 -0800 | [diff] [blame] | 180 | /* no buffer wraparound */ |
Greg Kroah-Hartman | ce9b490 | 2009-02-27 22:43:11 -0800 | [diff] [blame] | 181 | for (i = 1; i < length; ++i) |
| 182 | if (this->buf[this->pos_read + i] & 0x80) |
Markus Grabner | 705ecec | 2009-02-27 19:43:04 -0800 | [diff] [blame] | 183 | break; |
| 184 | |
| 185 | midi_length = i; |
Greg Kroah-Hartman | ce9b490 | 2009-02-27 22:43:11 -0800 | [diff] [blame] | 186 | } else { |
Markus Grabner | 705ecec | 2009-02-27 19:43:04 -0800 | [diff] [blame] | 187 | /* buffer wraparound */ |
| 188 | length2 = length - length1; |
| 189 | |
Greg Kroah-Hartman | ce9b490 | 2009-02-27 22:43:11 -0800 | [diff] [blame] | 190 | for (i = 1; i < length1; ++i) |
| 191 | if (this->buf[this->pos_read + i] & 0x80) |
Markus Grabner | 705ecec | 2009-02-27 19:43:04 -0800 | [diff] [blame] | 192 | break; |
| 193 | |
Greg Kroah-Hartman | ce9b490 | 2009-02-27 22:43:11 -0800 | [diff] [blame] | 194 | if (i < length1) |
Markus Grabner | 705ecec | 2009-02-27 19:43:04 -0800 | [diff] [blame] | 195 | midi_length = i; |
| 196 | else { |
Greg Kroah-Hartman | ce9b490 | 2009-02-27 22:43:11 -0800 | [diff] [blame] | 197 | for (i = 0; i < length2; ++i) |
| 198 | if (this->buf[i] & 0x80) |
Markus Grabner | 705ecec | 2009-02-27 19:43:04 -0800 | [diff] [blame] | 199 | break; |
| 200 | |
| 201 | midi_length = length1 + i; |
| 202 | } |
| 203 | } |
| 204 | |
Greg Kroah-Hartman | ce9b490 | 2009-02-27 22:43:11 -0800 | [diff] [blame] | 205 | if (midi_length == length) |
Markus Grabner | e1a164d | 2010-08-23 01:08:25 +0200 | [diff] [blame] | 206 | midi_length = -1; /* end of message not found */ |
Markus Grabner | 705ecec | 2009-02-27 19:43:04 -0800 | [diff] [blame] | 207 | } |
| 208 | |
Greg Kroah-Hartman | ce9b490 | 2009-02-27 22:43:11 -0800 | [diff] [blame] | 209 | if (midi_length < 0) { |
| 210 | if (!this->split) |
Markus Grabner | e1a164d | 2010-08-23 01:08:25 +0200 | [diff] [blame] | 211 | return 0; /* command is not yet complete */ |
Greg Kroah-Hartman | ce9b490 | 2009-02-27 22:43:11 -0800 | [diff] [blame] | 212 | } else { |
| 213 | if (length < midi_length) |
Markus Grabner | e1a164d | 2010-08-23 01:08:25 +0200 | [diff] [blame] | 214 | return 0; /* command is not yet complete */ |
Markus Grabner | 705ecec | 2009-02-27 19:43:04 -0800 | [diff] [blame] | 215 | |
| 216 | length = midi_length; |
| 217 | } |
| 218 | |
Greg Kroah-Hartman | ce9b490 | 2009-02-27 22:43:11 -0800 | [diff] [blame] | 219 | if (length < length1) { |
Markus Grabner | 705ecec | 2009-02-27 19:43:04 -0800 | [diff] [blame] | 220 | /* no buffer wraparound */ |
| 221 | memcpy(data + repeat, this->buf + this->pos_read, length); |
| 222 | this->pos_read += length; |
Greg Kroah-Hartman | ce9b490 | 2009-02-27 22:43:11 -0800 | [diff] [blame] | 223 | } else { |
Markus Grabner | 705ecec | 2009-02-27 19:43:04 -0800 | [diff] [blame] | 224 | /* buffer wraparound */ |
| 225 | length2 = length - length1; |
| 226 | memcpy(data + repeat, this->buf + this->pos_read, length1); |
| 227 | memcpy(data + repeat + length1, this->buf, length2); |
| 228 | this->pos_read = length2; |
| 229 | } |
| 230 | |
Greg Kroah-Hartman | ce9b490 | 2009-02-27 22:43:11 -0800 | [diff] [blame] | 231 | if (repeat) |
Markus Grabner | 705ecec | 2009-02-27 19:43:04 -0800 | [diff] [blame] | 232 | data[0] = this->command_prev; |
| 233 | |
| 234 | this->full = 0; |
| 235 | return length + repeat; |
| 236 | } |
| 237 | |
Stefan Hajnoczi | 269edc8 | 2013-01-11 23:08:09 +0100 | [diff] [blame] | 238 | int line6_midibuf_ignore(struct midi_buffer *this, int length) |
Markus Grabner | 705ecec | 2009-02-27 19:43:04 -0800 | [diff] [blame] | 239 | { |
Markus Grabner | 1027f476 | 2010-08-12 01:35:30 +0200 | [diff] [blame] | 240 | int bytes_used = line6_midibuf_bytes_used(this); |
Markus Grabner | 705ecec | 2009-02-27 19:43:04 -0800 | [diff] [blame] | 241 | |
Greg Kroah-Hartman | ce9b490 | 2009-02-27 22:43:11 -0800 | [diff] [blame] | 242 | if (length > bytes_used) |
Markus Grabner | 705ecec | 2009-02-27 19:43:04 -0800 | [diff] [blame] | 243 | length = bytes_used; |
| 244 | |
| 245 | this->pos_read = (this->pos_read + length) % this->size; |
| 246 | this->full = 0; |
| 247 | return length; |
| 248 | } |
| 249 | |
Stefan Hajnoczi | 269edc8 | 2013-01-11 23:08:09 +0100 | [diff] [blame] | 250 | int line6_midibuf_skip_message(struct midi_buffer *this, unsigned short mask) |
Markus Grabner | 705ecec | 2009-02-27 19:43:04 -0800 | [diff] [blame] | 251 | { |
| 252 | int cmd = this->command_prev; |
| 253 | |
Greg Kroah-Hartman | ce9b490 | 2009-02-27 22:43:11 -0800 | [diff] [blame] | 254 | if ((cmd >= 0x80) && (cmd < 0xf0)) |
| 255 | if ((mask & (1 << (cmd & 0x0f))) == 0) |
Markus Grabner | 705ecec | 2009-02-27 19:43:04 -0800 | [diff] [blame] | 256 | return 1; |
| 257 | |
| 258 | return 0; |
| 259 | } |
| 260 | |
Stefan Hajnoczi | 269edc8 | 2013-01-11 23:08:09 +0100 | [diff] [blame] | 261 | void line6_midibuf_destroy(struct midi_buffer *this) |
Markus Grabner | 705ecec | 2009-02-27 19:43:04 -0800 | [diff] [blame] | 262 | { |
Greg Kroah-Hartman | 536165d | 2009-02-27 20:49:46 -0800 | [diff] [blame] | 263 | kfree(this->buf); |
| 264 | this->buf = NULL; |
Markus Grabner | 705ecec | 2009-02-27 19:43:04 -0800 | [diff] [blame] | 265 | } |