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>
35 #include <linux/kernel.h>
38 #include <linux/wait.h>
39 #include <linux/slab.h>
40 #include <linux/ioport.h>
41 #include <linux/major.h>
42 #include <linux/delay.h>
43 #include <linux/proc_fs.h>
44 #include <linux/smp_lock.h>
45 #include <linux/module.h>
47 #include <linux/device.h>
50 * This ought to be moved into include/asm/dma.h
53 #define valid_dma(n) ((n) >= 0 && (n) < MAX_DMA_CHANNELS && (n) != 4)
57 * Table for permanently allocated memory (used when unloading the module)
59 void * sound_mem_blocks[1024];
60 int sound_nblocks = 0;
62 /* Persistent DMA buffers */
63 #ifdef CONFIG_SOUND_DMAP
64 int sound_dmap_flag = 1;
66 int sound_dmap_flag = 0;
69 static char dma_alloc_map[MAX_DMA_CHANNELS];
71 #define DMA_MAP_UNAVAIL 0
72 #define DMA_MAP_FREE 1
73 #define DMA_MAP_BUSY 2
76 unsigned long seq_time = 0; /* Time for /dev/sequencer */
77 extern struct class *sound_class;
80 * Table for configurable mixer volume handling
82 static mixer_vol_table mixer_vols[MAX_MIXER_DEV];
83 static int num_mixer_volumes;
85 int *load_mixer_volumes(char *name, int *levels, int present)
89 for (i = 0; i < num_mixer_volumes; i++) {
90 if (strcmp(name, mixer_vols[i].name) == 0) {
92 mixer_vols[i].num = i;
93 return mixer_vols[i].levels;
96 if (num_mixer_volumes >= MAX_MIXER_DEV) {
97 printk(KERN_ERR "Sound: Too many mixers (%s)\n", name);
100 n = num_mixer_volumes++;
102 strcpy(mixer_vols[n].name, name);
105 mixer_vols[n].num = n;
107 mixer_vols[n].num = -1;
109 for (i = 0; i < 32; i++)
110 mixer_vols[n].levels[i] = levels[i];
111 return mixer_vols[n].levels;
113 EXPORT_SYMBOL(load_mixer_volumes);
115 static int set_mixer_levels(void __user * arg)
117 /* mixer_vol_table is 174 bytes, so IMHO no reason to not allocate it on the stack */
120 if (__copy_from_user(&buf, arg, sizeof(buf)))
122 load_mixer_volumes(buf.name, buf.levels, 0);
123 if (__copy_to_user(arg, &buf, sizeof(buf)))
128 static int get_mixer_levels(void __user * arg)
132 if (__get_user(n, (int __user *)(&(((mixer_vol_table __user *)arg)->num))))
134 if (n < 0 || n >= num_mixer_volumes)
136 if (__copy_to_user(arg, &mixer_vols[n], sizeof(mixer_vol_table)))
141 /* 4K page size but our output routines use some slack for overruns */
142 #define PROC_BLOCK_SIZE (3*1024)
144 static ssize_t sound_read(struct file *file, char __user *buf, size_t count, loff_t *ppos)
146 int dev = iminor(file->f_path.dentry->d_inode);
150 * The OSS drivers aren't remotely happy without this locking,
151 * and unless someone fixes them when they are about to bite the
152 * big one anyway, we might as well bandage here..
157 DEB(printk("sound_read(dev=%d, count=%d)\n", dev, count));
158 switch (dev & 0x0f) {
162 ret = audio_read(dev, file, buf, count);
167 ret = sequencer_read(dev, file, buf, count);
171 ret = MIDIbuf_read(dev, file, buf, count);
177 static ssize_t sound_write(struct file *file, const char __user *buf, size_t count, loff_t *ppos)
179 int dev = iminor(file->f_path.dentry->d_inode);
183 DEB(printk("sound_write(dev=%d, count=%d)\n", dev, count));
184 switch (dev & 0x0f) {
187 ret = sequencer_write(dev, file, buf, count);
193 ret = audio_write(dev, file, buf, count);
197 ret = MIDIbuf_write(dev, file, buf, count);
204 static int sound_open(struct inode *inode, struct file *file)
206 int dev = iminor(inode);
209 DEB(printk("sound_open(dev=%d)\n", dev));
210 if ((dev >= SND_NDEVS) || (dev < 0)) {
211 printk(KERN_ERR "Invalid minor device %d\n", dev);
214 switch (dev & 0x0f) {
217 if (dev >= 0 && dev < MAX_MIXER_DEV && mixer_devs[dev] == NULL) {
218 request_module("mixer%d", dev);
220 if (dev && (dev >= num_mixers || mixer_devs[dev] == NULL))
223 if (!try_module_get(mixer_devs[dev]->owner))
229 if ((retval = sequencer_open(dev, file)) < 0)
234 if ((retval = MIDIbuf_open(dev, file)) < 0)
241 if ((retval = audio_open(dev, file)) < 0)
246 printk(KERN_ERR "Invalid minor device %d\n", dev);
253 static int sound_release(struct inode *inode, struct file *file)
255 int dev = iminor(inode);
258 DEB(printk("sound_release(dev=%d)\n", dev));
259 switch (dev & 0x0f) {
261 module_put(mixer_devs[dev >> 4]->owner);
266 sequencer_release(dev, file);
270 MIDIbuf_release(dev, file);
276 audio_release(dev, file);
280 printk(KERN_ERR "Sound error: Releasing unknown device 0x%02x\n", dev);
287 static int get_mixer_info(int dev, void __user *arg)
290 memset(&info, 0, sizeof(info));
291 strlcpy(info.id, mixer_devs[dev]->id, sizeof(info.id));
292 strlcpy(info.name, mixer_devs[dev]->name, sizeof(info.name));
293 info.modify_counter = mixer_devs[dev]->modify_counter;
294 if (__copy_to_user(arg, &info, sizeof(info)))
299 static int get_old_mixer_info(int dev, void __user *arg)
301 _old_mixer_info info;
302 memset(&info, 0, sizeof(info));
303 strlcpy(info.id, mixer_devs[dev]->id, sizeof(info.id));
304 strlcpy(info.name, mixer_devs[dev]->name, sizeof(info.name));
305 if (copy_to_user(arg, &info, sizeof(info)))
310 static int sound_mixer_ioctl(int mixdev, unsigned int cmd, void __user *arg)
312 if (mixdev < 0 || mixdev >= MAX_MIXER_DEV)
314 /* Try to load the mixer... */
315 if (mixer_devs[mixdev] == NULL) {
316 request_module("mixer%d", mixdev);
318 if (mixdev >= num_mixers || !mixer_devs[mixdev])
320 if (cmd == SOUND_MIXER_INFO)
321 return get_mixer_info(mixdev, arg);
322 if (cmd == SOUND_OLD_MIXER_INFO)
323 return get_old_mixer_info(mixdev, arg);
324 if (_SIOC_DIR(cmd) & _SIOC_WRITE)
325 mixer_devs[mixdev]->modify_counter++;
326 if (!mixer_devs[mixdev]->ioctl)
328 return mixer_devs[mixdev]->ioctl(mixdev, cmd, arg);
331 static int sound_ioctl(struct inode *inode, struct file *file,
332 unsigned int cmd, unsigned long arg)
335 int dev = iminor(inode);
336 void __user *p = (void __user *)arg;
338 if (_SIOC_DIR(cmd) != _SIOC_NONE && _SIOC_DIR(cmd) != 0) {
340 * Have to validate the address given by the process.
342 len = _SIOC_SIZE(cmd);
343 if (len < 1 || len > 65536 || !p)
345 if (_SIOC_DIR(cmd) & _SIOC_WRITE)
346 if (!access_ok(VERIFY_READ, p, len))
348 if (_SIOC_DIR(cmd) & _SIOC_READ)
349 if (!access_ok(VERIFY_WRITE, p, len))
352 DEB(printk("sound_ioctl(dev=%d, cmd=0x%x, arg=0x%x)\n", dev, cmd, arg));
353 if (cmd == OSS_GETVERSION)
354 return __put_user(SOUND_VERSION, (int __user *)p);
356 if (_IOC_TYPE(cmd) == 'M' && num_mixers > 0 && /* Mixer ioctl */
357 (dev & 0x0f) != SND_DEV_CTL) {
363 return sound_mixer_ioctl(audio_devs[dev >> 4]->mixer_dev,
367 return sound_mixer_ioctl(dev >> 4, cmd, p);
370 switch (dev & 0x0f) {
372 if (cmd == SOUND_MIXER_GETLEVELS)
373 return get_mixer_levels(p);
374 if (cmd == SOUND_MIXER_SETLEVELS)
375 return set_mixer_levels(p);
376 return sound_mixer_ioctl(dev >> 4, cmd, p);
380 return sequencer_ioctl(dev, file, cmd, p);
385 return audio_ioctl(dev, file, cmd, p);
389 return MIDIbuf_ioctl(dev, file, cmd, p);
396 static unsigned int sound_poll(struct file *file, poll_table * wait)
398 struct inode *inode = file->f_path.dentry->d_inode;
399 int dev = iminor(inode);
401 DEB(printk("sound_poll(dev=%d)\n", dev));
402 switch (dev & 0x0f) {
405 return sequencer_poll(dev, file, wait);
408 return MIDIbuf_poll(dev, file, wait);
413 return DMAbuf_poll(file, dev >> 4, wait);
418 static int sound_mmap(struct file *file, struct vm_area_struct *vma)
422 struct dma_buffparms *dmap = NULL;
423 int dev = iminor(file->f_path.dentry->d_inode);
425 dev_class = dev & 0x0f;
428 if (dev_class != SND_DEV_DSP && dev_class != SND_DEV_DSP16 && dev_class != SND_DEV_AUDIO) {
429 printk(KERN_ERR "Sound: mmap() not supported for other than audio devices\n");
433 if (vma->vm_flags & VM_WRITE) /* Map write and read/write to the output buf */
434 dmap = audio_devs[dev]->dmap_out;
435 else if (vma->vm_flags & VM_READ)
436 dmap = audio_devs[dev]->dmap_in;
438 printk(KERN_ERR "Sound: Undefined mmap() access\n");
444 printk(KERN_ERR "Sound: mmap() error. dmap == NULL\n");
448 if (dmap->raw_buf == NULL) {
449 printk(KERN_ERR "Sound: mmap() called when raw_buf == NULL\n");
453 if (dmap->mapping_flags) {
454 printk(KERN_ERR "Sound: mmap() called twice for the same DMA buffer\n");
458 if (vma->vm_pgoff != 0) {
459 printk(KERN_ERR "Sound: mmap() offset must be 0.\n");
463 size = vma->vm_end - vma->vm_start;
465 if (size != dmap->bytes_in_use) {
466 printk(KERN_WARNING "Sound: mmap() size = %ld. Should be %d\n", size, dmap->bytes_in_use);
468 if (remap_pfn_range(vma, vma->vm_start,
469 virt_to_phys(dmap->raw_buf) >> PAGE_SHIFT,
470 vma->vm_end - vma->vm_start, vma->vm_page_prot)) {
475 dmap->mapping_flags |= DMA_MAP_MAPPED;
477 if( audio_devs[dev]->d->mmap)
478 audio_devs[dev]->d->mmap(dev);
480 memset(dmap->raw_buf,
487 const struct file_operations oss_sound_fops = {
488 .owner = THIS_MODULE,
491 .write = sound_write,
493 .ioctl = sound_ioctl,
496 .release = sound_release,
500 * Create the required special subdevices
503 static int create_special_devices(void)
506 seq1=register_sound_special(&oss_sound_fops, 1);
509 seq2=register_sound_special(&oss_sound_fops, 8);
512 unregister_sound_special(1);
518 /* These device names follow the official Linux device list,
519 * Documentation/devices.txt. Let us know if there are other
520 * common names we should support for compatibility.
521 * Only those devices not created by the generic code in sound_core.c are
524 static const struct {
525 unsigned short minor;
529 } dev_list[] = { /* list of minor devices */
530 /* seems to be some confusion here -- this device is not in the device list */
531 {SND_DEV_DSP16, "dspW", S_IWUGO | S_IRUSR | S_IRGRP,
533 {SND_DEV_AUDIO, "audio", S_IWUGO | S_IRUSR | S_IRGRP,
540 module_param(dmabuf, int, 0444);
541 module_param(dmabug, int, 0444);
543 static int __init oss_init(void)
550 isa_dma_bridge_buggy = dmabug;
553 err = create_special_devices();
555 printk(KERN_ERR "sound: driver already loaded/included in kernel\n");
559 /* Protecting the innocent */
560 sound_dmap_flag = (dmabuf > 0 ? 1 : 0);
562 for (i = 0; i < ARRAY_SIZE(dev_list); i++) {
563 device_create_drvdata(sound_class, NULL,
564 MKDEV(SOUND_MAJOR, dev_list[i].minor),
565 NULL, "%s", dev_list[i].name);
567 if (!dev_list[i].num)
570 for (j = 1; j < *dev_list[i].num; j++)
571 device_create_drvdata(sound_class, NULL,
573 dev_list[i].minor + (j*0x10)),
575 "%s%d", dev_list[i].name, j);
578 if (sound_nblocks >= 1024)
579 printk(KERN_ERR "Sound warning: Deallocation table was too small.\n");
584 static void __exit oss_cleanup(void)
588 for (i = 0; i < ARRAY_SIZE(dev_list); i++) {
589 device_destroy(sound_class, MKDEV(SOUND_MAJOR, dev_list[i].minor));
590 if (!dev_list[i].num)
592 for (j = 1; j < *dev_list[i].num; j++)
593 device_destroy(sound_class, MKDEV(SOUND_MAJOR, dev_list[i].minor + (j*0x10)));
596 unregister_sound_special(1);
597 unregister_sound_special(8);
603 for (i = 0; i < MAX_DMA_CHANNELS; i++)
604 if (dma_alloc_map[i] != DMA_MAP_UNAVAIL) {
605 printk(KERN_ERR "Sound: Hmm, DMA%d was left allocated - fixed\n", i);
609 for (i = 0; i < sound_nblocks; i++)
610 vfree(sound_mem_blocks[i]);
614 module_init(oss_init);
615 module_exit(oss_cleanup);
616 MODULE_LICENSE("GPL");
617 MODULE_DESCRIPTION("OSS Sound subsystem");
618 MODULE_AUTHOR("Hannu Savolainen, et al.");
621 int sound_alloc_dma(int chn, char *deviceID)
625 if ((err = request_dma(chn, deviceID)) != 0)
628 dma_alloc_map[chn] = DMA_MAP_FREE;
632 EXPORT_SYMBOL(sound_alloc_dma);
634 int sound_open_dma(int chn, char *deviceID)
636 if (!valid_dma(chn)) {
637 printk(KERN_ERR "sound_open_dma: Invalid DMA channel %d\n", chn);
641 if (dma_alloc_map[chn] != DMA_MAP_FREE) {
642 printk("sound_open_dma: DMA channel %d busy or not allocated (%d)\n", chn, dma_alloc_map[chn]);
645 dma_alloc_map[chn] = DMA_MAP_BUSY;
648 EXPORT_SYMBOL(sound_open_dma);
650 void sound_free_dma(int chn)
652 if (dma_alloc_map[chn] == DMA_MAP_UNAVAIL) {
653 /* printk( "sound_free_dma: Bad access to DMA channel %d\n", chn); */
657 dma_alloc_map[chn] = DMA_MAP_UNAVAIL;
659 EXPORT_SYMBOL(sound_free_dma);
661 void sound_close_dma(int chn)
663 if (dma_alloc_map[chn] != DMA_MAP_BUSY) {
664 printk(KERN_ERR "sound_close_dma: Bad access to DMA channel %d\n", chn);
667 dma_alloc_map[chn] = DMA_MAP_FREE;
669 EXPORT_SYMBOL(sound_close_dma);
671 static void do_sequencer_timer(unsigned long dummy)
677 static DEFINE_TIMER(seq_timer, do_sequencer_timer, 0, 0);
679 void request_sound_timer(int count)
681 extern unsigned long seq_time;
684 seq_timer.expires = (-count) + jiffies;
685 add_timer(&seq_timer);
695 seq_timer.expires = (count) + jiffies;
696 add_timer(&seq_timer);
699 void sound_stop_timer(void)
701 del_timer(&seq_timer);
704 void conf_printf(char *name, struct address_info *hw_config)
706 #ifndef CONFIG_SOUND_TRACEINIT
709 printk("<%s> at 0x%03x", name, hw_config->io_base);
712 printk(" irq %d", (hw_config->irq > 0) ? hw_config->irq : -hw_config->irq);
714 if (hw_config->dma != -1 || hw_config->dma2 != -1)
716 printk(" dma %d", hw_config->dma);
717 if (hw_config->dma2 != -1)
718 printk(",%d", hw_config->dma2);
723 EXPORT_SYMBOL(conf_printf);
725 void conf_printf2(char *name, int base, int irq, int dma, int dma2)
727 #ifndef CONFIG_SOUND_TRACEINIT
730 printk("<%s> at 0x%03x", name, base);
733 printk(" irq %d", (irq > 0) ? irq : -irq);
735 if (dma != -1 || dma2 != -1)
737 printk(" dma %d", dma);
744 EXPORT_SYMBOL(conf_printf2);