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/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>
46 #include <linux/device.h>
49 * This ought to be moved into include/asm/dma.h
52 #define valid_dma(n) ((n) >= 0 && (n) < MAX_DMA_CHANNELS && (n) != 4)
56 * Table for permanently allocated memory (used when unloading the module)
58 void * sound_mem_blocks[MAX_MEM_BLOCKS];
59 int sound_nblocks = 0;
61 /* Persistent DMA buffers */
62 #ifdef CONFIG_SOUND_DMAP
63 int sound_dmap_flag = 1;
65 int sound_dmap_flag = 0;
68 static char dma_alloc_map[MAX_DMA_CHANNELS];
70 #define DMA_MAP_UNAVAIL 0
71 #define DMA_MAP_FREE 1
72 #define DMA_MAP_BUSY 2
75 unsigned long seq_time = 0; /* Time for /dev/sequencer */
76 extern struct class *sound_class;
79 * Table for configurable mixer volume handling
81 static mixer_vol_table mixer_vols[MAX_MIXER_DEV];
82 static int num_mixer_volumes;
84 int *load_mixer_volumes(char *name, int *levels, int present)
88 for (i = 0; i < num_mixer_volumes; i++) {
89 if (strcmp(name, mixer_vols[i].name) == 0) {
91 mixer_vols[i].num = i;
92 return mixer_vols[i].levels;
95 if (num_mixer_volumes >= MAX_MIXER_DEV) {
96 printk(KERN_ERR "Sound: Too many mixers (%s)\n", name);
99 n = num_mixer_volumes++;
101 strcpy(mixer_vols[n].name, name);
104 mixer_vols[n].num = n;
106 mixer_vols[n].num = -1;
108 for (i = 0; i < 32; i++)
109 mixer_vols[n].levels[i] = levels[i];
110 return mixer_vols[n].levels;
112 EXPORT_SYMBOL(load_mixer_volumes);
114 static int set_mixer_levels(void __user * arg)
116 /* mixer_vol_table is 174 bytes, so IMHO no reason to not allocate it on the stack */
119 if (__copy_from_user(&buf, arg, sizeof(buf)))
121 load_mixer_volumes(buf.name, buf.levels, 0);
122 if (__copy_to_user(arg, &buf, sizeof(buf)))
127 static int get_mixer_levels(void __user * arg)
131 if (__get_user(n, (int __user *)(&(((mixer_vol_table __user *)arg)->num))))
133 if (n < 0 || n >= num_mixer_volumes)
135 if (__copy_to_user(arg, &mixer_vols[n], sizeof(mixer_vol_table)))
140 /* 4K page size but our output routines use some slack for overruns */
141 #define PROC_BLOCK_SIZE (3*1024)
143 static ssize_t sound_read(struct file *file, char __user *buf, size_t count, loff_t *ppos)
145 int dev = iminor(file->f_path.dentry->d_inode);
149 * The OSS drivers aren't remotely happy without this locking,
150 * and unless someone fixes them when they are about to bite the
151 * big one anyway, we might as well bandage here..
156 DEB(printk("sound_read(dev=%d, count=%d)\n", dev, count));
157 switch (dev & 0x0f) {
161 ret = audio_read(dev, file, buf, count);
166 ret = sequencer_read(dev, file, buf, count);
170 ret = MIDIbuf_read(dev, file, buf, count);
176 static ssize_t sound_write(struct file *file, const char __user *buf, size_t count, loff_t *ppos)
178 int dev = iminor(file->f_path.dentry->d_inode);
182 DEB(printk("sound_write(dev=%d, count=%d)\n", dev, count));
183 switch (dev & 0x0f) {
186 ret = sequencer_write(dev, file, buf, count);
192 ret = audio_write(dev, file, buf, count);
196 ret = MIDIbuf_write(dev, file, buf, count);
203 static int sound_open(struct inode *inode, struct file *file)
205 int dev = iminor(inode);
208 DEB(printk("sound_open(dev=%d)\n", dev));
209 if ((dev >= SND_NDEVS) || (dev < 0)) {
210 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);
221 if (dev && (dev >= num_mixers || mixer_devs[dev] == NULL))
224 if (!try_module_get(mixer_devs[dev]->owner))
232 retval = sequencer_open(dev, file);
236 retval = MIDIbuf_open(dev, file);
242 retval = audio_open(dev, file);
246 printk(KERN_ERR "Invalid minor device %d\n", dev);
254 static int sound_release(struct inode *inode, struct file *file)
256 int dev = iminor(inode);
259 DEB(printk("sound_release(dev=%d)\n", dev));
260 switch (dev & 0x0f) {
262 module_put(mixer_devs[dev >> 4]->owner);
267 sequencer_release(dev, file);
271 MIDIbuf_release(dev, file);
277 audio_release(dev, file);
281 printk(KERN_ERR "Sound error: Releasing unknown device 0x%02x\n", dev);
288 static int get_mixer_info(int dev, void __user *arg)
291 memset(&info, 0, sizeof(info));
292 strlcpy(info.id, mixer_devs[dev]->id, sizeof(info.id));
293 strlcpy(info.name, mixer_devs[dev]->name, sizeof(info.name));
294 info.modify_counter = mixer_devs[dev]->modify_counter;
295 if (__copy_to_user(arg, &info, sizeof(info)))
300 static int get_old_mixer_info(int dev, void __user *arg)
302 _old_mixer_info info;
303 memset(&info, 0, sizeof(info));
304 strlcpy(info.id, mixer_devs[dev]->id, sizeof(info.id));
305 strlcpy(info.name, mixer_devs[dev]->name, sizeof(info.name));
306 if (copy_to_user(arg, &info, sizeof(info)))
311 static int sound_mixer_ioctl(int mixdev, unsigned int cmd, void __user *arg)
313 if (mixdev < 0 || mixdev >= MAX_MIXER_DEV)
315 /* Try to load the mixer... */
316 if (mixer_devs[mixdev] == NULL) {
317 request_module("mixer%d", mixdev);
319 if (mixdev >= num_mixers || !mixer_devs[mixdev])
321 if (cmd == SOUND_MIXER_INFO)
322 return get_mixer_info(mixdev, arg);
323 if (cmd == SOUND_OLD_MIXER_INFO)
324 return get_old_mixer_info(mixdev, arg);
325 if (_SIOC_DIR(cmd) & _SIOC_WRITE)
326 mixer_devs[mixdev]->modify_counter++;
327 if (!mixer_devs[mixdev]->ioctl)
329 return mixer_devs[mixdev]->ioctl(mixdev, cmd, arg);
332 static long sound_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
335 int dev = iminor(file->f_dentry->d_inode);
337 void __user *p = (void __user *)arg;
339 if (_SIOC_DIR(cmd) != _SIOC_NONE && _SIOC_DIR(cmd) != 0) {
341 * Have to validate the address given by the process.
343 len = _SIOC_SIZE(cmd);
344 if (len < 1 || len > 65536 || !p)
346 if (_SIOC_DIR(cmd) & _SIOC_WRITE)
347 if (!access_ok(VERIFY_READ, p, len))
349 if (_SIOC_DIR(cmd) & _SIOC_READ)
350 if (!access_ok(VERIFY_WRITE, p, len))
353 DEB(printk("sound_ioctl(dev=%d, cmd=0x%x, arg=0x%x)\n", dev, cmd, arg));
354 if (cmd == OSS_GETVERSION)
355 return __put_user(SOUND_VERSION, (int __user *)p);
358 if (_IOC_TYPE(cmd) == 'M' && num_mixers > 0 && /* Mixer ioctl */
359 (dev & 0x0f) != SND_DEV_CTL) {
365 ret = sound_mixer_ioctl(audio_devs[dev >> 4]->mixer_dev,
369 ret = sound_mixer_ioctl(dev >> 4, cmd, p);
376 switch (dev & 0x0f) {
378 if (cmd == SOUND_MIXER_GETLEVELS)
379 ret = get_mixer_levels(p);
380 else if (cmd == SOUND_MIXER_SETLEVELS)
381 ret = set_mixer_levels(p);
383 ret = sound_mixer_ioctl(dev >> 4, cmd, p);
388 ret = sequencer_ioctl(dev, file, cmd, p);
394 ret = audio_ioctl(dev, file, cmd, p);
398 ret = MIDIbuf_ioctl(dev, file, cmd, p);
406 static unsigned int sound_poll(struct file *file, poll_table * wait)
408 struct inode *inode = file->f_path.dentry->d_inode;
409 int dev = iminor(inode);
411 DEB(printk("sound_poll(dev=%d)\n", dev));
412 switch (dev & 0x0f) {
415 return sequencer_poll(dev, file, wait);
418 return MIDIbuf_poll(dev, file, wait);
423 return DMAbuf_poll(file, dev >> 4, wait);
428 static int sound_mmap(struct file *file, struct vm_area_struct *vma)
432 struct dma_buffparms *dmap = NULL;
433 int dev = iminor(file->f_path.dentry->d_inode);
435 dev_class = dev & 0x0f;
438 if (dev_class != SND_DEV_DSP && dev_class != SND_DEV_DSP16 && dev_class != SND_DEV_AUDIO) {
439 printk(KERN_ERR "Sound: mmap() not supported for other than audio devices\n");
443 if (vma->vm_flags & VM_WRITE) /* Map write and read/write to the output buf */
444 dmap = audio_devs[dev]->dmap_out;
445 else if (vma->vm_flags & VM_READ)
446 dmap = audio_devs[dev]->dmap_in;
448 printk(KERN_ERR "Sound: Undefined mmap() access\n");
454 printk(KERN_ERR "Sound: mmap() error. dmap == NULL\n");
458 if (dmap->raw_buf == NULL) {
459 printk(KERN_ERR "Sound: mmap() called when raw_buf == NULL\n");
463 if (dmap->mapping_flags) {
464 printk(KERN_ERR "Sound: mmap() called twice for the same DMA buffer\n");
468 if (vma->vm_pgoff != 0) {
469 printk(KERN_ERR "Sound: mmap() offset must be 0.\n");
473 size = vma->vm_end - vma->vm_start;
475 if (size != dmap->bytes_in_use) {
476 printk(KERN_WARNING "Sound: mmap() size = %ld. Should be %d\n", size, dmap->bytes_in_use);
478 if (remap_pfn_range(vma, vma->vm_start,
479 virt_to_phys(dmap->raw_buf) >> PAGE_SHIFT,
480 vma->vm_end - vma->vm_start, vma->vm_page_prot)) {
485 dmap->mapping_flags |= DMA_MAP_MAPPED;
487 if( audio_devs[dev]->d->mmap)
488 audio_devs[dev]->d->mmap(dev);
490 memset(dmap->raw_buf,
497 const struct file_operations oss_sound_fops = {
498 .owner = THIS_MODULE,
501 .write = sound_write,
503 .unlocked_ioctl = sound_ioctl,
506 .release = sound_release,
510 * Create the required special subdevices
513 static int create_special_devices(void)
516 seq1=register_sound_special(&oss_sound_fops, 1);
519 seq2=register_sound_special(&oss_sound_fops, 8);
522 unregister_sound_special(1);
528 /* These device names follow the official Linux device list,
529 * Documentation/devices.txt. Let us know if there are other
530 * common names we should support for compatibility.
531 * Only those devices not created by the generic code in sound_core.c are
534 static const struct {
535 unsigned short minor;
539 } dev_list[] = { /* list of minor devices */
540 /* seems to be some confusion here -- this device is not in the device list */
541 {SND_DEV_DSP16, "dspW", S_IWUGO | S_IRUSR | S_IRGRP,
543 {SND_DEV_AUDIO, "audio", S_IWUGO | S_IRUSR | S_IRGRP,
550 module_param(dmabuf, int, 0444);
551 module_param(dmabug, int, 0444);
553 static int __init oss_init(void)
560 isa_dma_bridge_buggy = dmabug;
563 err = create_special_devices();
565 printk(KERN_ERR "sound: driver already loaded/included in kernel\n");
569 /* Protecting the innocent */
570 sound_dmap_flag = (dmabuf > 0 ? 1 : 0);
572 for (i = 0; i < ARRAY_SIZE(dev_list); i++) {
573 device_create(sound_class, NULL,
574 MKDEV(SOUND_MAJOR, dev_list[i].minor), NULL,
575 "%s", dev_list[i].name);
577 if (!dev_list[i].num)
580 for (j = 1; j < *dev_list[i].num; j++)
581 device_create(sound_class, NULL,
583 dev_list[i].minor + (j*0x10)),
584 NULL, "%s%d", dev_list[i].name, j);
587 if (sound_nblocks >= MAX_MEM_BLOCKS - 1)
588 printk(KERN_ERR "Sound warning: Deallocation table was too small.\n");
593 static void __exit oss_cleanup(void)
597 for (i = 0; i < ARRAY_SIZE(dev_list); i++) {
598 device_destroy(sound_class, MKDEV(SOUND_MAJOR, dev_list[i].minor));
599 if (!dev_list[i].num)
601 for (j = 1; j < *dev_list[i].num; j++)
602 device_destroy(sound_class, MKDEV(SOUND_MAJOR, dev_list[i].minor + (j*0x10)));
605 unregister_sound_special(1);
606 unregister_sound_special(8);
612 for (i = 0; i < MAX_DMA_CHANNELS; i++)
613 if (dma_alloc_map[i] != DMA_MAP_UNAVAIL) {
614 printk(KERN_ERR "Sound: Hmm, DMA%d was left allocated - fixed\n", i);
618 for (i = 0; i < sound_nblocks; i++)
619 vfree(sound_mem_blocks[i]);
623 module_init(oss_init);
624 module_exit(oss_cleanup);
625 MODULE_LICENSE("GPL");
626 MODULE_DESCRIPTION("OSS Sound subsystem");
627 MODULE_AUTHOR("Hannu Savolainen, et al.");
630 int sound_alloc_dma(int chn, char *deviceID)
634 if ((err = request_dma(chn, deviceID)) != 0)
637 dma_alloc_map[chn] = DMA_MAP_FREE;
641 EXPORT_SYMBOL(sound_alloc_dma);
643 int sound_open_dma(int chn, char *deviceID)
645 if (!valid_dma(chn)) {
646 printk(KERN_ERR "sound_open_dma: Invalid DMA channel %d\n", chn);
650 if (dma_alloc_map[chn] != DMA_MAP_FREE) {
651 printk("sound_open_dma: DMA channel %d busy or not allocated (%d)\n", chn, dma_alloc_map[chn]);
654 dma_alloc_map[chn] = DMA_MAP_BUSY;
657 EXPORT_SYMBOL(sound_open_dma);
659 void sound_free_dma(int chn)
661 if (dma_alloc_map[chn] == DMA_MAP_UNAVAIL) {
662 /* printk( "sound_free_dma: Bad access to DMA channel %d\n", chn); */
666 dma_alloc_map[chn] = DMA_MAP_UNAVAIL;
668 EXPORT_SYMBOL(sound_free_dma);
670 void sound_close_dma(int chn)
672 if (dma_alloc_map[chn] != DMA_MAP_BUSY) {
673 printk(KERN_ERR "sound_close_dma: Bad access to DMA channel %d\n", chn);
676 dma_alloc_map[chn] = DMA_MAP_FREE;
678 EXPORT_SYMBOL(sound_close_dma);
680 static void do_sequencer_timer(unsigned long dummy)
686 static DEFINE_TIMER(seq_timer, do_sequencer_timer, 0, 0);
688 void request_sound_timer(int count)
690 extern unsigned long seq_time;
693 seq_timer.expires = (-count) + jiffies;
694 add_timer(&seq_timer);
704 seq_timer.expires = (count) + jiffies;
705 add_timer(&seq_timer);
708 void sound_stop_timer(void)
710 del_timer(&seq_timer);
713 void conf_printf(char *name, struct address_info *hw_config)
715 #ifndef CONFIG_SOUND_TRACEINIT
718 printk("<%s> at 0x%03x", name, hw_config->io_base);
721 printk(" irq %d", (hw_config->irq > 0) ? hw_config->irq : -hw_config->irq);
723 if (hw_config->dma != -1 || hw_config->dma2 != -1)
725 printk(" dma %d", hw_config->dma);
726 if (hw_config->dma2 != -1)
727 printk(",%d", hw_config->dma2);
732 EXPORT_SYMBOL(conf_printf);
734 void conf_printf2(char *name, int base, int irq, int dma, int dma2)
736 #ifndef CONFIG_SOUND_TRACEINIT
739 printk("<%s> at 0x%03x", name, base);
742 printk(" irq %d", (irq > 0) ? irq : -irq);
744 if (dma != -1 || dma2 != -1)
746 printk(" dma %d", dma);
753 EXPORT_SYMBOL(conf_printf2);