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Linux/sound/isa/msnd/msnd_midi.c

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  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 <linux/export.h>
 33 #include <sound/core.h>
 34 #include <sound/rawmidi.h>
 35 
 36 #include "msnd.h"
 37 
 38 #define MSNDMIDI_MODE_BIT_INPUT         0
 39 #define MSNDMIDI_MODE_BIT_OUTPUT                1
 40 #define MSNDMIDI_MODE_BIT_INPUT_TRIGGER 2
 41 #define MSNDMIDI_MODE_BIT_OUTPUT_TRIGGER        3
 42 
 43 struct snd_msndmidi {
 44         struct snd_msnd *dev;
 45 
 46         unsigned long mode;             /* MSNDMIDI_MODE_XXXX */
 47 
 48         struct snd_rawmidi_substream *substream_input;
 49 
 50         spinlock_t input_lock;
 51 };
 52 
 53 /*
 54  * input/output open/close - protected by open_mutex in rawmidi.c
 55  */
 56 static int snd_msndmidi_input_open(struct snd_rawmidi_substream *substream)
 57 {
 58         struct snd_msndmidi *mpu;
 59 
 60         snd_printdd("snd_msndmidi_input_open()\n");
 61 
 62         mpu = substream->rmidi->private_data;
 63 
 64         mpu->substream_input = substream;
 65 
 66         snd_msnd_enable_irq(mpu->dev);
 67 
 68         snd_msnd_send_dsp_cmd(mpu->dev, HDEX_MIDI_IN_START);
 69         set_bit(MSNDMIDI_MODE_BIT_INPUT, &mpu->mode);
 70         return 0;
 71 }
 72 
 73 static int snd_msndmidi_input_close(struct snd_rawmidi_substream *substream)
 74 {
 75         struct snd_msndmidi *mpu;
 76 
 77         mpu = substream->rmidi->private_data;
 78         snd_msnd_send_dsp_cmd(mpu->dev, HDEX_MIDI_IN_STOP);
 79         clear_bit(MSNDMIDI_MODE_BIT_INPUT, &mpu->mode);
 80         mpu->substream_input = NULL;
 81         snd_msnd_disable_irq(mpu->dev);
 82         return 0;
 83 }
 84 
 85 static void snd_msndmidi_input_drop(struct snd_msndmidi *mpu)
 86 {
 87         u16 tail;
 88 
 89         tail = readw(mpu->dev->MIDQ + JQS_wTail);
 90         writew(tail, mpu->dev->MIDQ + JQS_wHead);
 91 }
 92 
 93 /*
 94  * trigger input
 95  */
 96 static void snd_msndmidi_input_trigger(struct snd_rawmidi_substream *substream,
 97                                         int up)
 98 {
 99         unsigned long flags;
100         struct snd_msndmidi *mpu;
101 
102         snd_printdd("snd_msndmidi_input_trigger(, %i)\n", up);
103 
104         mpu = substream->rmidi->private_data;
105         spin_lock_irqsave(&mpu->input_lock, flags);
106         if (up) {
107                 if (!test_and_set_bit(MSNDMIDI_MODE_BIT_INPUT_TRIGGER,
108                                       &mpu->mode))
109                         snd_msndmidi_input_drop(mpu);
110         } else {
111                 clear_bit(MSNDMIDI_MODE_BIT_INPUT_TRIGGER, &mpu->mode);
112         }
113         spin_unlock_irqrestore(&mpu->input_lock, flags);
114         if (up)
115                 snd_msndmidi_input_read(mpu);
116 }
117 
118 void snd_msndmidi_input_read(void *mpuv)
119 {
120         unsigned long flags;
121         struct snd_msndmidi *mpu = mpuv;
122         void *pwMIDQData = mpu->dev->mappedbase + MIDQ_DATA_BUFF;
123 
124         spin_lock_irqsave(&mpu->input_lock, flags);
125         while (readw(mpu->dev->MIDQ + JQS_wTail) !=
126                readw(mpu->dev->MIDQ + JQS_wHead)) {
127                 u16 wTmp, val;
128                 val = readw(pwMIDQData + 2 * readw(mpu->dev->MIDQ + JQS_wHead));
129 
130                         if (test_bit(MSNDMIDI_MODE_BIT_INPUT_TRIGGER,
131                                      &mpu->mode))
132                                 snd_rawmidi_receive(mpu->substream_input,
133                                                     (unsigned char *)&val, 1);
134 
135                 wTmp = readw(mpu->dev->MIDQ + JQS_wHead) + 1;
136                 if (wTmp > readw(mpu->dev->MIDQ + JQS_wSize))
137                         writew(0,  mpu->dev->MIDQ + JQS_wHead);
138                 else
139                         writew(wTmp,  mpu->dev->MIDQ + JQS_wHead);
140         }
141         spin_unlock_irqrestore(&mpu->input_lock, flags);
142 }
143 EXPORT_SYMBOL(snd_msndmidi_input_read);
144 
145 static struct snd_rawmidi_ops snd_msndmidi_input = {
146         .open =         snd_msndmidi_input_open,
147         .close =        snd_msndmidi_input_close,
148         .trigger =      snd_msndmidi_input_trigger,
149 };
150 
151 static void snd_msndmidi_free(struct snd_rawmidi *rmidi)
152 {
153         struct snd_msndmidi *mpu = rmidi->private_data;
154         kfree(mpu);
155 }
156 
157 int snd_msndmidi_new(struct snd_card *card, int device)
158 {
159         struct snd_msnd *chip = card->private_data;
160         struct snd_msndmidi *mpu;
161         struct snd_rawmidi *rmidi;
162         int err;
163 
164         err = snd_rawmidi_new(card, "MSND-MIDI", device, 1, 1, &rmidi);
165         if (err < 0)
166                 return err;
167         mpu = kzalloc(sizeof(*mpu), GFP_KERNEL);
168         if (mpu == NULL) {
169                 snd_device_free(card, rmidi);
170                 return -ENOMEM;
171         }
172         mpu->dev = chip;
173         chip->msndmidi_mpu = mpu;
174         rmidi->private_data = mpu;
175         rmidi->private_free = snd_msndmidi_free;
176         spin_lock_init(&mpu->input_lock);
177         strcpy(rmidi->name, "MSND MIDI");
178         snd_rawmidi_set_ops(rmidi, SNDRV_RAWMIDI_STREAM_INPUT,
179                             &snd_msndmidi_input);
180         rmidi->info_flags |= SNDRV_RAWMIDI_INFO_INPUT;
181         return 0;
182 }
183 

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