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1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 | /* * Copyright (c) by Jaroslav Kysela <perex@perex.cz> * Copyright (c) 2009 by Krzysztof Helt * Routines for control of MPU-401 in UART mode * * MPU-401 supports UART mode which is not capable generate transmit * interrupts thus output is done via polling. Also, if irq < 0, then * input is done also via polling. Do not expect good performance. * * * 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; either version 2 of the License, or * (at your option) any later version. * * This program is distributed in the hope that it will be useful, * but WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the * GNU General Public License for more details. * * You should have received a copy of the GNU General Public License * along with this program; if not, write to the Free Software * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA * */ #include <linux/io.h> #include <linux/slab.h> #include <linux/delay.h> #include <linux/ioport.h> #include <linux/errno.h> #include <linux/export.h> #include <sound/core.h> #include <sound/rawmidi.h> #include "msnd.h" #define MSNDMIDI_MODE_BIT_INPUT 0 #define MSNDMIDI_MODE_BIT_OUTPUT 1 #define MSNDMIDI_MODE_BIT_INPUT_TRIGGER 2 #define MSNDMIDI_MODE_BIT_OUTPUT_TRIGGER 3 struct snd_msndmidi { struct snd_msnd *dev; unsigned long mode; /* MSNDMIDI_MODE_XXXX */ struct snd_rawmidi_substream *substream_input; spinlock_t input_lock; }; /* * input/output open/close - protected by open_mutex in rawmidi.c */ static int snd_msndmidi_input_open(struct snd_rawmidi_substream *substream) { struct snd_msndmidi *mpu; snd_printdd("snd_msndmidi_input_open()\n"); mpu = substream->rmidi->private_data; mpu->substream_input = substream; snd_msnd_enable_irq(mpu->dev); snd_msnd_send_dsp_cmd(mpu->dev, HDEX_MIDI_IN_START); set_bit(MSNDMIDI_MODE_BIT_INPUT, &mpu->mode); return 0; } static int snd_msndmidi_input_close(struct snd_rawmidi_substream *substream) { struct snd_msndmidi *mpu; mpu = substream->rmidi->private_data; snd_msnd_send_dsp_cmd(mpu->dev, HDEX_MIDI_IN_STOP); clear_bit(MSNDMIDI_MODE_BIT_INPUT, &mpu->mode); mpu->substream_input = NULL; snd_msnd_disable_irq(mpu->dev); return 0; } static void snd_msndmidi_input_drop(struct snd_msndmidi *mpu) { u16 tail; tail = readw(mpu->dev->MIDQ + JQS_wTail); writew(tail, mpu->dev->MIDQ + JQS_wHead); } /* * trigger input */ static void snd_msndmidi_input_trigger(struct snd_rawmidi_substream *substream, int up) { unsigned long flags; struct snd_msndmidi *mpu; snd_printdd("snd_msndmidi_input_trigger(, %i)\n", up); mpu = substream->rmidi->private_data; spin_lock_irqsave(&mpu->input_lock, flags); if (up) { if (!test_and_set_bit(MSNDMIDI_MODE_BIT_INPUT_TRIGGER, &mpu->mode)) snd_msndmidi_input_drop(mpu); } else { clear_bit(MSNDMIDI_MODE_BIT_INPUT_TRIGGER, &mpu->mode); } spin_unlock_irqrestore(&mpu->input_lock, flags); if (up) snd_msndmidi_input_read(mpu); } void snd_msndmidi_input_read(void *mpuv) { unsigned long flags; struct snd_msndmidi *mpu = mpuv; void __iomem *pwMIDQData = mpu->dev->mappedbase + MIDQ_DATA_BUFF; u16 head, tail, size; spin_lock_irqsave(&mpu->input_lock, flags); head = readw(mpu->dev->MIDQ + JQS_wHead); tail = readw(mpu->dev->MIDQ + JQS_wTail); size = readw(mpu->dev->MIDQ + JQS_wSize); if (head > size || tail > size) goto out; while (head != tail) { unsigned char val = readw(pwMIDQData + 2 * head); if (test_bit(MSNDMIDI_MODE_BIT_INPUT_TRIGGER, &mpu->mode)) snd_rawmidi_receive(mpu->substream_input, &val, 1); if (++head > size) head = 0; writew(head, mpu->dev->MIDQ + JQS_wHead); } out: spin_unlock_irqrestore(&mpu->input_lock, flags); } EXPORT_SYMBOL(snd_msndmidi_input_read); static const struct snd_rawmidi_ops snd_msndmidi_input = { .open = snd_msndmidi_input_open, .close = snd_msndmidi_input_close, .trigger = snd_msndmidi_input_trigger, }; static void snd_msndmidi_free(struct snd_rawmidi *rmidi) { struct snd_msndmidi *mpu = rmidi->private_data; kfree(mpu); } int snd_msndmidi_new(struct snd_card *card, int device) { struct snd_msnd *chip = card->private_data; struct snd_msndmidi *mpu; struct snd_rawmidi *rmidi; int err; err = snd_rawmidi_new(card, "MSND-MIDI", device, 1, 1, &rmidi); if (err < 0) return err; mpu = kzalloc(sizeof(*mpu), GFP_KERNEL); if (mpu == NULL) { snd_device_free(card, rmidi); return -ENOMEM; } mpu->dev = chip; chip->msndmidi_mpu = mpu; rmidi->private_data = mpu; rmidi->private_free = snd_msndmidi_free; spin_lock_init(&mpu->input_lock); strcpy(rmidi->name, "MSND MIDI"); snd_rawmidi_set_ops(rmidi, SNDRV_RAWMIDI_STREAM_INPUT, &snd_msndmidi_input); rmidi->info_flags |= SNDRV_RAWMIDI_INFO_INPUT; return 0; } |