diff options
Diffstat (limited to 'sound/oss/midibuf.c')
| -rw-r--r-- | sound/oss/midibuf.c | 427 |
1 files changed, 0 insertions, 427 deletions
diff --git a/sound/oss/midibuf.c b/sound/oss/midibuf.c deleted file mode 100644 index 1277df815d5b..000000000000 --- a/sound/oss/midibuf.c +++ /dev/null @@ -1,427 +0,0 @@ -/* - * sound/oss/midibuf.c - * - * Device file manager for /dev/midi# - */ -/* - * Copyright (C) by Hannu Savolainen 1993-1997 - * - * OSS/Free for Linux is distributed under the GNU GENERAL PUBLIC LICENSE (GPL) - * Version 2 (June 1991). See the "COPYING" file distributed with this software - * for more info. - */ -/* - * Thomas Sailer : ioctl code reworked (vmalloc/vfree removed) - */ -#include <linux/stddef.h> -#include <linux/kmod.h> -#include <linux/spinlock.h> -#include <linux/sched/signal.h> - -#define MIDIBUF_C - -#include "sound_config.h" - - -/* - * Don't make MAX_QUEUE_SIZE larger than 4000 - */ - -#define MAX_QUEUE_SIZE 4000 - -static wait_queue_head_t midi_sleeper[MAX_MIDI_DEV]; -static wait_queue_head_t input_sleeper[MAX_MIDI_DEV]; - -struct midi_buf -{ - int len, head, tail; - unsigned char queue[MAX_QUEUE_SIZE]; -}; - -struct midi_parms -{ - long prech_timeout; /* - * Timeout before the first ch - */ -}; - -static struct midi_buf *midi_out_buf[MAX_MIDI_DEV] = {NULL}; -static struct midi_buf *midi_in_buf[MAX_MIDI_DEV] = {NULL}; -static struct midi_parms parms[MAX_MIDI_DEV]; - -static void midi_poll(unsigned long dummy); - - -static DEFINE_TIMER(poll_timer, midi_poll); - -static volatile int open_devs; -static DEFINE_SPINLOCK(lock); - -#define DATA_AVAIL(q) (q->len) -#define SPACE_AVAIL(q) (MAX_QUEUE_SIZE - q->len) - -#define QUEUE_BYTE(q, data) \ - if (SPACE_AVAIL(q)) \ - { \ - unsigned long flags; \ - spin_lock_irqsave(&lock, flags); \ - q->queue[q->tail] = (data); \ - q->len++; q->tail = (q->tail+1) % MAX_QUEUE_SIZE; \ - spin_unlock_irqrestore(&lock, flags); \ - } - -#define REMOVE_BYTE(q, data) \ - if (DATA_AVAIL(q)) \ - { \ - unsigned long flags; \ - spin_lock_irqsave(&lock, flags); \ - data = q->queue[q->head]; \ - q->len--; q->head = (q->head+1) % MAX_QUEUE_SIZE; \ - spin_unlock_irqrestore(&lock, flags); \ - } - -static void drain_midi_queue(int dev) -{ - - /* - * Give the Midi driver time to drain its output queues - */ - - if (midi_devs[dev]->buffer_status != NULL) - wait_event_interruptible_timeout(midi_sleeper[dev], - !midi_devs[dev]->buffer_status(dev), HZ/10); -} - -static void midi_input_intr(int dev, unsigned char data) -{ - if (midi_in_buf[dev] == NULL) - return; - - if (data == 0xfe) /* - * Active sensing - */ - return; /* - * Ignore - */ - - if (SPACE_AVAIL(midi_in_buf[dev])) { - QUEUE_BYTE(midi_in_buf[dev], data); - wake_up(&input_sleeper[dev]); - } -} - -static void midi_output_intr(int dev) -{ - /* - * Currently NOP - */ -} - -static void midi_poll(unsigned long dummy) -{ - unsigned long flags; - int dev; - - spin_lock_irqsave(&lock, flags); - if (open_devs) - { - for (dev = 0; dev < num_midis; dev++) - if (midi_devs[dev] != NULL && midi_out_buf[dev] != NULL) - { - while (DATA_AVAIL(midi_out_buf[dev])) - { - int ok; - int c = midi_out_buf[dev]->queue[midi_out_buf[dev]->head]; - - spin_unlock_irqrestore(&lock,flags);/* Give some time to others */ - ok = midi_devs[dev]->outputc(dev, c); - spin_lock_irqsave(&lock, flags); - if (!ok) - break; - midi_out_buf[dev]->head = (midi_out_buf[dev]->head + 1) % MAX_QUEUE_SIZE; - midi_out_buf[dev]->len--; - } - - if (DATA_AVAIL(midi_out_buf[dev]) < 100) - wake_up(&midi_sleeper[dev]); - } - poll_timer.expires = (1) + jiffies; - add_timer(&poll_timer); - /* - * Come back later - */ - } - spin_unlock_irqrestore(&lock, flags); -} - -int MIDIbuf_open(int dev, struct file *file) -{ - int mode, err; - - dev = dev >> 4; - mode = translate_mode(file); - - if (num_midis > MAX_MIDI_DEV) - { - printk(KERN_ERR "midi: Too many midi interfaces\n"); - num_midis = MAX_MIDI_DEV; - } - if (dev < 0 || dev >= num_midis || midi_devs[dev] == NULL) - return -ENXIO; - /* - * Interrupts disabled. Be careful - */ - - module_put(midi_devs[dev]->owner); - - if ((err = midi_devs[dev]->open(dev, mode, - midi_input_intr, midi_output_intr)) < 0) - return err; - - parms[dev].prech_timeout = MAX_SCHEDULE_TIMEOUT; - midi_in_buf[dev] = vmalloc(sizeof(struct midi_buf)); - - if (midi_in_buf[dev] == NULL) - { - printk(KERN_WARNING "midi: Can't allocate buffer\n"); - midi_devs[dev]->close(dev); - return -EIO; - } - midi_in_buf[dev]->len = midi_in_buf[dev]->head = midi_in_buf[dev]->tail = 0; - - midi_out_buf[dev] = vmalloc(sizeof(struct midi_buf)); - - if (midi_out_buf[dev] == NULL) - { - printk(KERN_WARNING "midi: Can't allocate buffer\n"); - midi_devs[dev]->close(dev); - vfree(midi_in_buf[dev]); - midi_in_buf[dev] = NULL; - return -EIO; - } - midi_out_buf[dev]->len = midi_out_buf[dev]->head = midi_out_buf[dev]->tail = 0; - open_devs++; - - init_waitqueue_head(&midi_sleeper[dev]); - init_waitqueue_head(&input_sleeper[dev]); - - if (open_devs < 2) /* This was first open */ - { - poll_timer.expires = 1 + jiffies; - add_timer(&poll_timer); /* Start polling */ - } - return err; -} - -void MIDIbuf_release(int dev, struct file *file) -{ - int mode; - - dev = dev >> 4; - mode = translate_mode(file); - - if (dev < 0 || dev >= num_midis || midi_devs[dev] == NULL) - return; - - /* - * Wait until the queue is empty - */ - - if (mode != OPEN_READ) - { - midi_devs[dev]->outputc(dev, 0xfe); /* - * Active sensing to shut the - * devices - */ - - wait_event_interruptible(midi_sleeper[dev], - !DATA_AVAIL(midi_out_buf[dev])); - /* - * Sync - */ - - drain_midi_queue(dev); /* - * Ensure the output queues are empty - */ - } - - midi_devs[dev]->close(dev); - - open_devs--; - if (open_devs == 0) - del_timer_sync(&poll_timer); - vfree(midi_in_buf[dev]); - vfree(midi_out_buf[dev]); - midi_in_buf[dev] = NULL; - midi_out_buf[dev] = NULL; - - module_put(midi_devs[dev]->owner); -} - -int MIDIbuf_write(int dev, struct file *file, const char __user *buf, int count) -{ - int c, n, i; - unsigned char tmp_data; - - dev = dev >> 4; - - if (!count) - return 0; - - c = 0; - - while (c < count) - { - n = SPACE_AVAIL(midi_out_buf[dev]); - - if (n == 0) { /* - * No space just now. - */ - - if (file->f_flags & O_NONBLOCK) { - c = -EAGAIN; - goto out; - } - - if (wait_event_interruptible(midi_sleeper[dev], - SPACE_AVAIL(midi_out_buf[dev]))) - { - c = -EINTR; - goto out; - } - n = SPACE_AVAIL(midi_out_buf[dev]); - } - if (n > (count - c)) - n = count - c; - - for (i = 0; i < n; i++) - { - /* BROKE BROKE BROKE - CAN'T DO THIS WITH CLI !! */ - /* yes, think the same, so I removed the cli() brackets - QUEUE_BYTE is protected against interrupts */ - if (copy_from_user((char *) &tmp_data, &(buf)[c], 1)) { - c = -EFAULT; - goto out; - } - QUEUE_BYTE(midi_out_buf[dev], tmp_data); - c++; - } - } -out: - return c; -} - - -int MIDIbuf_read(int dev, struct file *file, char __user *buf, int count) -{ - int n, c = 0; - unsigned char tmp_data; - - dev = dev >> 4; - - if (!DATA_AVAIL(midi_in_buf[dev])) { /* - * No data yet, wait - */ - if (file->f_flags & O_NONBLOCK) { - c = -EAGAIN; - goto out; - } - wait_event_interruptible_timeout(input_sleeper[dev], - DATA_AVAIL(midi_in_buf[dev]), - parms[dev].prech_timeout); - - if (signal_pending(current)) - c = -EINTR; /* The user is getting restless */ - } - if (c == 0 && DATA_AVAIL(midi_in_buf[dev])) /* - * Got some bytes - */ - { - n = DATA_AVAIL(midi_in_buf[dev]); - if (n > count) - n = count; - c = 0; - - while (c < n) - { - char *fixit; - REMOVE_BYTE(midi_in_buf[dev], tmp_data); - fixit = (char *) &tmp_data; - /* BROKE BROKE BROKE */ - /* yes removed the cli() brackets again - should q->len,tail&head be atomic_t? */ - if (copy_to_user(&(buf)[c], fixit, 1)) { - c = -EFAULT; - goto out; - } - c++; - } - } -out: - return c; -} - -int MIDIbuf_ioctl(int dev, struct file *file, - unsigned int cmd, void __user *arg) -{ - int val; - - dev = dev >> 4; - - if (((cmd >> 8) & 0xff) == 'C') - { - if (midi_devs[dev]->coproc) /* Coprocessor ioctl */ - return midi_devs[dev]->coproc->ioctl(midi_devs[dev]->coproc->devc, cmd, arg, 0); -/* printk("/dev/midi%d: No coprocessor for this device\n", dev);*/ - return -ENXIO; - } - else - { - switch (cmd) - { - case SNDCTL_MIDI_PRETIME: - if (get_user(val, (int __user *)arg)) - return -EFAULT; - if (val < 0) - val = 0; - val = (HZ * val) / 10; - parms[dev].prech_timeout = val; - return put_user(val, (int __user *)arg); - - default: - if (!midi_devs[dev]->ioctl) - return -EINVAL; - return midi_devs[dev]->ioctl(dev, cmd, arg); - } - } -} - -/* No kernel lock - fine */ -unsigned int MIDIbuf_poll(int dev, struct file *file, poll_table * wait) -{ - unsigned int mask = 0; - - dev = dev >> 4; - - /* input */ - poll_wait(file, &input_sleeper[dev], wait); - if (DATA_AVAIL(midi_in_buf[dev])) - mask |= POLLIN | POLLRDNORM; - - /* output */ - poll_wait(file, &midi_sleeper[dev], wait); - if (!SPACE_AVAIL(midi_out_buf[dev])) - mask |= POLLOUT | POLLWRNORM; - - return mask; -} - - -int MIDIbuf_avail(int dev) -{ - if (midi_in_buf[dev]) - return DATA_AVAIL (midi_in_buf[dev]); - return 0; -} -EXPORT_SYMBOL(MIDIbuf_avail); - |