2 * linux/sound/oss/soundcard.c
4 * Sound card driver for Linux
7 * Copyright (C) by Hannu Savolainen 1993-1997
9 * OSS/Free for Linux is distributed under the GNU GENERAL PUBLIC LICENSE (GPL)
10 * Version 2 (June 1991). See the "COPYING" file distributed with this software
14 * Thomas Sailer : ioctl code reworked (vmalloc/vfree removed)
15 * integrated sound_switch.c
16 * Stefan Reinauer : integrated /proc/sound (equals to /dev/sndstat,
17 * which should disappear in the near future)
18 * Eric Dumas : devfs support (22-Jan-98) <dumas@linux.eu.org> with
19 * fixups by C. Scott Ananian <cananian@alumni.princeton.edu>
20 * Richard Gooch : moved common (non OSS-specific) devices to sound_core.c
21 * Rob Riggs : Added persistent DMA buffers support (1998/10/17)
22 * Christoph Hellwig : Some cleanup work (2000/03/01)
26 #include "sound_config.h"
27 #include <linux/init.h>
28 #include <linux/types.h>
29 #include <linux/errno.h>
30 #include <linux/signal.h>
31 #include <linux/fcntl.h>
32 #include <linux/ctype.h>
33 #include <linux/stddef.h>
34 #include <linux/kmod.h>
37 #include <linux/wait.h>
38 #include <linux/slab.h>
39 #include <linux/ioport.h>
40 #include <linux/major.h>
41 #include <linux/delay.h>
42 #include <linux/proc_fs.h>
43 #include <linux/smp_lock.h>
44 #include <linux/module.h>
47 * This ought to be moved into include/asm/dma.h
50 #define valid_dma(n) ((n) >= 0 && (n) < MAX_DMA_CHANNELS && (n) != 4)
54 * Table for permanently allocated memory (used when unloading the module)
56 void * sound_mem_blocks[1024];
57 int sound_nblocks = 0;
59 /* Persistent DMA buffers */
60 #ifdef CONFIG_SOUND_DMAP
61 int sound_dmap_flag = 1;
63 int sound_dmap_flag = 0;
66 static char dma_alloc_map[MAX_DMA_CHANNELS];
68 #define DMA_MAP_UNAVAIL 0
69 #define DMA_MAP_FREE 1
70 #define DMA_MAP_BUSY 2
73 unsigned long seq_time = 0; /* Time for /dev/sequencer */
74 extern struct class *sound_class;
77 * Table for configurable mixer volume handling
79 static mixer_vol_table mixer_vols[MAX_MIXER_DEV];
80 static int num_mixer_volumes;
82 int *load_mixer_volumes(char *name, int *levels, int present)
86 for (i = 0; i < num_mixer_volumes; i++) {
87 if (strcmp(name, mixer_vols[i].name) == 0) {
89 mixer_vols[i].num = i;
90 return mixer_vols[i].levels;
93 if (num_mixer_volumes >= MAX_MIXER_DEV) {
94 printk(KERN_ERR "Sound: Too many mixers (%s)\n", name);
97 n = num_mixer_volumes++;
99 strcpy(mixer_vols[n].name, name);
102 mixer_vols[n].num = n;
104 mixer_vols[n].num = -1;
106 for (i = 0; i < 32; i++)
107 mixer_vols[n].levels[i] = levels[i];
108 return mixer_vols[n].levels;
110 EXPORT_SYMBOL(load_mixer_volumes);
112 static int set_mixer_levels(void __user * arg)
114 /* mixer_vol_table is 174 bytes, so IMHO no reason to not allocate it on the stack */
117 if (__copy_from_user(&buf, arg, sizeof(buf)))
119 load_mixer_volumes(buf.name, buf.levels, 0);
120 if (__copy_to_user(arg, &buf, sizeof(buf)))
125 static int get_mixer_levels(void __user * arg)
129 if (__get_user(n, (int __user *)(&(((mixer_vol_table __user *)arg)->num))))
131 if (n < 0 || n >= num_mixer_volumes)
133 if (__copy_to_user(arg, &mixer_vols[n], sizeof(mixer_vol_table)))
138 /* 4K page size but our output routines use some slack for overruns */
139 #define PROC_BLOCK_SIZE (3*1024)
141 static ssize_t sound_read(struct file *file, char __user *buf, size_t count, loff_t *ppos)
143 int dev = iminor(file->f_dentry->d_inode);
147 * The OSS drivers aren't remotely happy without this locking,
148 * and unless someone fixes them when they are about to bite the
149 * big one anyway, we might as well bandage here..
154 DEB(printk("sound_read(dev=%d, count=%d)\n", dev, count));
155 switch (dev & 0x0f) {
159 ret = audio_read(dev, file, buf, count);
164 ret = sequencer_read(dev, file, buf, count);
168 ret = MIDIbuf_read(dev, file, buf, count);
174 static ssize_t sound_write(struct file *file, const char __user *buf, size_t count, loff_t *ppos)
176 int dev = iminor(file->f_dentry->d_inode);
180 DEB(printk("sound_write(dev=%d, count=%d)\n", dev, count));
181 switch (dev & 0x0f) {
184 ret = sequencer_write(dev, file, buf, count);
190 ret = audio_write(dev, file, buf, count);
194 ret = MIDIbuf_write(dev, file, buf, count);
201 static int sound_open(struct inode *inode, struct file *file)
203 int dev = iminor(inode);
206 DEB(printk("sound_open(dev=%d)\n", dev));
207 if ((dev >= SND_NDEVS) || (dev < 0)) {
208 printk(KERN_ERR "Invalid minor device %d\n", dev);
211 switch (dev & 0x0f) {
214 if (dev >= 0 && dev < MAX_MIXER_DEV && mixer_devs[dev] == NULL) {
215 request_module("mixer%d", dev);
217 if (dev && (dev >= num_mixers || mixer_devs[dev] == NULL))
220 if (!try_module_get(mixer_devs[dev]->owner))
226 if ((retval = sequencer_open(dev, file)) < 0)
231 if ((retval = MIDIbuf_open(dev, file)) < 0)
238 if ((retval = audio_open(dev, file)) < 0)
243 printk(KERN_ERR "Invalid minor device %d\n", dev);
250 static int sound_release(struct inode *inode, struct file *file)
252 int dev = iminor(inode);
255 DEB(printk("sound_release(dev=%d)\n", dev));
256 switch (dev & 0x0f) {
258 module_put(mixer_devs[dev >> 4]->owner);
263 sequencer_release(dev, file);
267 MIDIbuf_release(dev, file);
273 audio_release(dev, file);
277 printk(KERN_ERR "Sound error: Releasing unknown device 0x%02x\n", dev);
284 static int get_mixer_info(int dev, void __user *arg)
287 memset(&info, 0, sizeof(info));
288 strlcpy(info.id, mixer_devs[dev]->id, sizeof(info.id));
289 strlcpy(info.name, mixer_devs[dev]->name, sizeof(info.name));
290 info.modify_counter = mixer_devs[dev]->modify_counter;
291 if (__copy_to_user(arg, &info, sizeof(info)))
296 static int get_old_mixer_info(int dev, void __user *arg)
298 _old_mixer_info info;
299 memset(&info, 0, sizeof(info));
300 strlcpy(info.id, mixer_devs[dev]->id, sizeof(info.id));
301 strlcpy(info.name, mixer_devs[dev]->name, sizeof(info.name));
302 if (copy_to_user(arg, &info, sizeof(info)))
307 static int sound_mixer_ioctl(int mixdev, unsigned int cmd, void __user *arg)
309 if (mixdev < 0 || mixdev >= MAX_MIXER_DEV)
311 /* Try to load the mixer... */
312 if (mixer_devs[mixdev] == NULL) {
313 request_module("mixer%d", mixdev);
315 if (mixdev >= num_mixers || !mixer_devs[mixdev])
317 if (cmd == SOUND_MIXER_INFO)
318 return get_mixer_info(mixdev, arg);
319 if (cmd == SOUND_OLD_MIXER_INFO)
320 return get_old_mixer_info(mixdev, arg);
321 if (_SIOC_DIR(cmd) & _SIOC_WRITE)
322 mixer_devs[mixdev]->modify_counter++;
323 if (!mixer_devs[mixdev]->ioctl)
325 return mixer_devs[mixdev]->ioctl(mixdev, cmd, arg);
328 static int sound_ioctl(struct inode *inode, struct file *file,
329 unsigned int cmd, unsigned long arg)
332 int dev = iminor(inode);
333 void __user *p = (void __user *)arg;
335 if (_SIOC_DIR(cmd) != _SIOC_NONE && _SIOC_DIR(cmd) != 0) {
337 * Have to validate the address given by the process.
339 len = _SIOC_SIZE(cmd);
340 if (len < 1 || len > 65536 || !p)
342 if (_SIOC_DIR(cmd) & _SIOC_WRITE)
343 if (!access_ok(VERIFY_READ, p, len))
345 if (_SIOC_DIR(cmd) & _SIOC_READ)
346 if (!access_ok(VERIFY_WRITE, p, len))
349 DEB(printk("sound_ioctl(dev=%d, cmd=0x%x, arg=0x%x)\n", dev, cmd, arg));
350 if (cmd == OSS_GETVERSION)
351 return __put_user(SOUND_VERSION, (int __user *)p);
353 if (_IOC_TYPE(cmd) == 'M' && num_mixers > 0 && /* Mixer ioctl */
354 (dev & 0x0f) != SND_DEV_CTL) {
360 return sound_mixer_ioctl(audio_devs[dev >> 4]->mixer_dev,
364 return sound_mixer_ioctl(dev >> 4, cmd, p);
367 switch (dev & 0x0f) {
369 if (cmd == SOUND_MIXER_GETLEVELS)
370 return get_mixer_levels(p);
371 if (cmd == SOUND_MIXER_SETLEVELS)
372 return set_mixer_levels(p);
373 return sound_mixer_ioctl(dev >> 4, cmd, p);
377 return sequencer_ioctl(dev, file, cmd, p);
382 return audio_ioctl(dev, file, cmd, p);
386 return MIDIbuf_ioctl(dev, file, cmd, p);
393 static unsigned int sound_poll(struct file *file, poll_table * wait)
395 struct inode *inode = file->f_dentry->d_inode;
396 int dev = iminor(inode);
398 DEB(printk("sound_poll(dev=%d)\n", dev));
399 switch (dev & 0x0f) {
402 return sequencer_poll(dev, file, wait);
405 return MIDIbuf_poll(dev, file, wait);
410 return DMAbuf_poll(file, dev >> 4, wait);
415 static int sound_mmap(struct file *file, struct vm_area_struct *vma)
419 struct dma_buffparms *dmap = NULL;
420 int dev = iminor(file->f_dentry->d_inode);
422 dev_class = dev & 0x0f;
425 if (dev_class != SND_DEV_DSP && dev_class != SND_DEV_DSP16 && dev_class != SND_DEV_AUDIO) {
426 printk(KERN_ERR "Sound: mmap() not supported for other than audio devices\n");
430 if (vma->vm_flags & VM_WRITE) /* Map write and read/write to the output buf */
431 dmap = audio_devs[dev]->dmap_out;
432 else if (vma->vm_flags & VM_READ)
433 dmap = audio_devs[dev]->dmap_in;
435 printk(KERN_ERR "Sound: Undefined mmap() access\n");
441 printk(KERN_ERR "Sound: mmap() error. dmap == NULL\n");
445 if (dmap->raw_buf == NULL) {
446 printk(KERN_ERR "Sound: mmap() called when raw_buf == NULL\n");
450 if (dmap->mapping_flags) {
451 printk(KERN_ERR "Sound: mmap() called twice for the same DMA buffer\n");
455 if (vma->vm_pgoff != 0) {
456 printk(KERN_ERR "Sound: mmap() offset must be 0.\n");
460 size = vma->vm_end - vma->vm_start;
462 if (size != dmap->bytes_in_use) {
463 printk(KERN_WARNING "Sound: mmap() size = %ld. Should be %d\n", size, dmap->bytes_in_use);
465 if (remap_pfn_range(vma, vma->vm_start,
466 virt_to_phys(dmap->raw_buf) >> PAGE_SHIFT,
467 vma->vm_end - vma->vm_start, vma->vm_page_prot)) {
472 dmap->mapping_flags |= DMA_MAP_MAPPED;
474 if( audio_devs[dev]->d->mmap)
475 audio_devs[dev]->d->mmap(dev);
477 memset(dmap->raw_buf,
484 struct file_operations oss_sound_fops = {
485 .owner = THIS_MODULE,
488 .write = sound_write,
490 .ioctl = sound_ioctl,
493 .release = sound_release,
497 * Create the required special subdevices
500 static int create_special_devices(void)
503 seq1=register_sound_special(&oss_sound_fops, 1);
506 seq2=register_sound_special(&oss_sound_fops, 8);
509 unregister_sound_special(1);
515 /* These device names follow the official Linux device list,
516 * Documentation/devices.txt. Let us know if there are other
517 * common names we should support for compatibility.
518 * Only those devices not created by the generic code in sound_core.c are
521 static const struct {
522 unsigned short minor;
526 } dev_list[] = { /* list of minor devices */
527 /* seems to be some confusion here -- this device is not in the device list */
528 {SND_DEV_DSP16, "dspW", S_IWUGO | S_IRUSR | S_IRGRP,
530 {SND_DEV_AUDIO, "audio", S_IWUGO | S_IRUSR | S_IRGRP,
537 module_param(dmabuf, int, 0444);
538 module_param(dmabug, int, 0444);
540 static int __init oss_init(void)
547 isa_dma_bridge_buggy = dmabug;
550 err = create_special_devices();
552 printk(KERN_ERR "sound: driver already loaded/included in kernel\n");
556 /* Protecting the innocent */
557 sound_dmap_flag = (dmabuf > 0 ? 1 : 0);
559 for (i = 0; i < sizeof (dev_list) / sizeof *dev_list; i++) {
560 class_device_create(sound_class, NULL,
561 MKDEV(SOUND_MAJOR, dev_list[i].minor),
562 NULL, "%s", dev_list[i].name);
564 if (!dev_list[i].num)
567 for (j = 1; j < *dev_list[i].num; j++)
568 class_device_create(sound_class, NULL,
569 MKDEV(SOUND_MAJOR, dev_list[i].minor + (j*0x10)),
570 NULL, "%s%d", dev_list[i].name, j);
573 if (sound_nblocks >= 1024)
574 printk(KERN_ERR "Sound warning: Deallocation table was too small.\n");
579 static void __exit oss_cleanup(void)
583 for (i = 0; i < sizeof (dev_list) / sizeof *dev_list; i++) {
584 class_device_destroy(sound_class, MKDEV(SOUND_MAJOR, dev_list[i].minor));
585 if (!dev_list[i].num)
587 for (j = 1; j < *dev_list[i].num; j++)
588 class_device_destroy(sound_class, MKDEV(SOUND_MAJOR, dev_list[i].minor + (j*0x10)));
591 unregister_sound_special(1);
592 unregister_sound_special(8);
598 for (i = 0; i < MAX_DMA_CHANNELS; i++)
599 if (dma_alloc_map[i] != DMA_MAP_UNAVAIL) {
600 printk(KERN_ERR "Sound: Hmm, DMA%d was left allocated - fixed\n", i);
604 for (i = 0; i < sound_nblocks; i++)
605 vfree(sound_mem_blocks[i]);
609 module_init(oss_init);
610 module_exit(oss_cleanup);
611 MODULE_LICENSE("GPL");
612 MODULE_DESCRIPTION("OSS Sound subsystem");
613 MODULE_AUTHOR("Hannu Savolainen, et al.");
616 int sound_alloc_dma(int chn, char *deviceID)
620 if ((err = request_dma(chn, deviceID)) != 0)
623 dma_alloc_map[chn] = DMA_MAP_FREE;
627 EXPORT_SYMBOL(sound_alloc_dma);
629 int sound_open_dma(int chn, char *deviceID)
631 if (!valid_dma(chn)) {
632 printk(KERN_ERR "sound_open_dma: Invalid DMA channel %d\n", chn);
636 if (dma_alloc_map[chn] != DMA_MAP_FREE) {
637 printk("sound_open_dma: DMA channel %d busy or not allocated (%d)\n", chn, dma_alloc_map[chn]);
640 dma_alloc_map[chn] = DMA_MAP_BUSY;
643 EXPORT_SYMBOL(sound_open_dma);
645 void sound_free_dma(int chn)
647 if (dma_alloc_map[chn] == DMA_MAP_UNAVAIL) {
648 /* printk( "sound_free_dma: Bad access to DMA channel %d\n", chn); */
652 dma_alloc_map[chn] = DMA_MAP_UNAVAIL;
654 EXPORT_SYMBOL(sound_free_dma);
656 void sound_close_dma(int chn)
658 if (dma_alloc_map[chn] != DMA_MAP_BUSY) {
659 printk(KERN_ERR "sound_close_dma: Bad access to DMA channel %d\n", chn);
662 dma_alloc_map[chn] = DMA_MAP_FREE;
664 EXPORT_SYMBOL(sound_close_dma);
666 static void do_sequencer_timer(unsigned long dummy)
672 static DEFINE_TIMER(seq_timer, do_sequencer_timer, 0, 0);
674 void request_sound_timer(int count)
676 extern unsigned long seq_time;
679 seq_timer.expires = (-count) + jiffies;
680 add_timer(&seq_timer);
690 seq_timer.expires = (count) + jiffies;
691 add_timer(&seq_timer);
694 void sound_stop_timer(void)
696 del_timer(&seq_timer);
699 void conf_printf(char *name, struct address_info *hw_config)
701 #ifndef CONFIG_SOUND_TRACEINIT
704 printk("<%s> at 0x%03x", name, hw_config->io_base);
707 printk(" irq %d", (hw_config->irq > 0) ? hw_config->irq : -hw_config->irq);
709 if (hw_config->dma != -1 || hw_config->dma2 != -1)
711 printk(" dma %d", hw_config->dma);
712 if (hw_config->dma2 != -1)
713 printk(",%d", hw_config->dma2);
718 EXPORT_SYMBOL(conf_printf);
720 void conf_printf2(char *name, int base, int irq, int dma, int dma2)
722 #ifndef CONFIG_SOUND_TRACEINIT
725 printk("<%s> at 0x%03x", name, base);
728 printk(" irq %d", (irq > 0) ? irq : -irq);
730 if (dma != -1 || dma2 != -1)
732 printk(" dma %d", dma);
739 EXPORT_SYMBOL(conf_printf2);