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