Linux-2.6.12-rc2v2.6.12-rc2

Initial git repository build. I'm not bothering with the full history,
even though we have it. We can create a separate "historical" git
archive of that later if we want to, and in the meantime it's about
3.2GB when imported into git - space that would just make the early
git days unnecessarily complicated, when we don't have a lot of good
infrastructure for it.

Let it rip!

1 files changed, 583 insertions, 0 deletions

diff --git a/sound/sound_core.c b/sound/sound_core.c
new file mode 100644
index 000000000000..30f75c9288cb
--- /dev/null
+++ b/sound/sound_core.c
@@ -0,0 +1,583 @@
+/*
+ *      Sound core handling. Breaks out sound functions to submodules
+ *      
+ *      Author:         Alan Cox <alan.cox@linux.org>
+ *
+ *      Fixes:
+ *
+ *
+ *      This program is free software; you can redistribute it and/or
+ *      modify it under the terms of the GNU General Public License
+ *      as published by the Free Software Foundation; either version
+ *      2 of the License, or (at your option) any later version.
+ *
+ *                         --------------------
+ * 
+ *      Top level handler for the sound subsystem. Various devices can
+ *      plug into this. The fact they don't all go via OSS doesn't mean 
+ *      they don't have to implement the OSS API. There is a lot of logic
+ *      to keeping much of the OSS weight out of the code in a compatibility
+ *      module, but it's up to the driver to rember to load it...
+ *
+ *      The code provides a set of functions for registration of devices
+ *      by type. This is done rather than providing a single call so that
+ *      we can hide any future changes in the internals (eg when we go to
+ *      32bit dev_t) from the modules and their interface.
+ *
+ *      Secondly we need to allocate the dsp, dsp16 and audio devices as
+ *      one. Thus we misuse the chains a bit to simplify this.
+ *
+ *      Thirdly to make it more fun and for 2.3.x and above we do all
+ *      of this using fine grained locking.
+ *
+ *      FIXME: we have to resolve modules and fine grained load/unload
+ *      locking at some point in 2.3.x.
+ */
+
+#include <linux/config.h>
+#include <linux/module.h>
+#include <linux/init.h>
+#include <linux/slab.h>
+#include <linux/types.h>
+#include <linux/kernel.h>
+#include <linux/fs.h>
+#include <linux/sound.h>
+#include <linux/major.h>
+#include <linux/kmod.h>
+#include <linux/devfs_fs_kernel.h>
+#include <linux/device.h>
+
+#define SOUND_STEP 16
+
+
+struct sound_unit
+{
+        int unit_minor;
+        struct file_operations *unit_fops;
+        struct sound_unit *next;
+        char name[32];
+};
+
+#ifdef CONFIG_SOUND_MSNDCLAS
+extern int msnd_classic_init(void);
+#endif
+#ifdef CONFIG_SOUND_MSNDPIN
+extern int msnd_pinnacle_init(void);
+#endif
+
+struct class_simple *sound_class;
+EXPORT_SYMBOL(sound_class);
+
+/*
+ *      Low level list operator. Scan the ordered list, find a hole and
+ *      join into it. Called with the lock asserted
+ */
+
+static int __sound_insert_unit(struct sound_unit * s, struct sound_unit **list, struct file_operations *fops, int index, int low, int top)
+{
+        int n=low;
+
+        if (index < 0) {        /* first free */
+
+                while (*list && (*list)->unit_minor<n)
+                        list=&((*list)->next);
+
+                while(n<top)
+                {
+                        /* Found a hole ? */
+                        if(*list==NULL || (*list)->unit_minor>n)
+                                break;
+                        list=&((*list)->next);
+                        n+=SOUND_STEP;
+                }
+
+                if(n>=top)
+                        return -ENOENT;
+        } else {
+                n = low+(index*16);
+                while (*list) {
+                        if ((*list)->unit_minor==n)
+                                return -EBUSY;
+                        if ((*list)->unit_minor>n)
+                                break;
+                        list=&((*list)->next);
+                }
+        }       
+                
+        /*
+         *      Fill it in
+         */
+         
+        s->unit_minor=n;
+        s->unit_fops=fops;
+        
+        /*
+         *      Link it
+         */
+         
+        s->next=*list;
+        *list=s;
+        
+        
+        return n;
+}
+
+/*
+ *      Remove a node from the chain. Called with the lock asserted
+ */
+ 
+static struct sound_unit *__sound_remove_unit(struct sound_unit **list, int unit)
+{
+        while(*list)
+        {
+                struct sound_unit *p=*list;
+                if(p->unit_minor==unit)
+                {
+                        *list=p->next;
+                        return p;
+                }
+                list=&(p->next);
+        }
+        printk(KERN_ERR "Sound device %d went missing!\n", unit);
+        return NULL;
+}
+
+/*
+ *      This lock guards the sound loader list.
+ */
+
+static DEFINE_SPINLOCK(sound_loader_lock);
+
+/*
+ *      Allocate the controlling structure and add it to the sound driver
+ *      list. Acquires locks as needed
+ */
+
+static int sound_insert_unit(struct sound_unit **list, struct file_operations *fops, int index, int low, int top, const char *name, umode_t mode)
+{
+        struct sound_unit *s = kmalloc(sizeof(*s), GFP_KERNEL);
+        int r;
+
+        if (!s)
+                return -ENOMEM;
+                
+        spin_lock(&sound_loader_lock);
+        r = __sound_insert_unit(s, list, fops, index, low, top);
+        spin_unlock(&sound_loader_lock);
+        
+        if (r < 0)
+                goto fail;
+        else if (r < SOUND_STEP)
+                sprintf(s->name, "sound/%s", name);
+        else
+                sprintf(s->name, "sound/%s%d", name, r / SOUND_STEP);
+
+        devfs_mk_cdev(MKDEV(SOUND_MAJOR, s->unit_minor),
+                        S_IFCHR | mode, s->name);
+        class_simple_device_add(sound_class, MKDEV(SOUND_MAJOR, s->unit_minor),
+                                NULL, s->name+6);
+        return r;
+
+ fail:
+        kfree(s);
+        return r;
+}
+
+/*
+ *      Remove a unit. Acquires locks as needed. The drivers MUST have
+ *      completed the removal before their file operations become
+ *      invalid.
+ */
+        
+static void sound_remove_unit(struct sound_unit **list, int unit)
+{
+        struct sound_unit *p;
+
+        spin_lock(&sound_loader_lock);
+        p = __sound_remove_unit(list, unit);
+        spin_unlock(&sound_loader_lock);
+        if (p) {
+                devfs_remove(p->name);
+                class_simple_device_remove(MKDEV(SOUND_MAJOR, p->unit_minor));
+                kfree(p);
+        }
+}
+
+/*
+ *      Allocations
+ *
+ *      0       *16             Mixers
+ *      1       *8              Sequencers
+ *      2       *16             Midi
+ *      3       *16             DSP
+ *      4       *16             SunDSP
+ *      5       *16             DSP16
+ *      6       --              sndstat (obsolete)
+ *      7       *16             unused
+ *      8       --              alternate sequencer (see above)
+ *      9       *16             raw synthesizer access
+ *      10      *16             unused
+ *      11      *16             unused
+ *      12      *16             unused
+ *      13      *16             unused
+ *      14      *16             unused
+ *      15      *16             unused
+ */
+
+static struct sound_unit *chains[SOUND_STEP];
+
+/**
+ *      register_sound_special - register a special sound node
+ *      @fops: File operations for the driver
+ *      @unit: Unit number to allocate
+ *
+ *      Allocate a special sound device by minor number from the sound
+ *      subsystem. The allocated number is returned on succes. On failure
+ *      a negative error code is returned.
+ */
+ 
+int register_sound_special(struct file_operations *fops, int unit)
+{
+        const int chain = unit % SOUND_STEP;
+        int max_unit = 128 + chain;
+        const char *name;
+        char _name[16];
+
+        switch (chain) {
+            case 0:
+                name = "mixer";
+                break;
+            case 1:
+                name = "sequencer";
+                if (unit >= SOUND_STEP)
+                        goto __unknown;
+                max_unit = unit + 1;
+                break;
+            case 2:
+                name = "midi";
+                break;
+            case 3:
+                name = "dsp";
+                break;
+            case 4:
+                name = "audio";
+                break;
+            case 8:
+                name = "sequencer2";
+                if (unit >= SOUND_STEP)
+                        goto __unknown;
+                max_unit = unit + 1;
+                break;
+            case 9:
+                name = "dmmidi";
+                break;
+            case 10:
+                name = "dmfm";
+                break;
+            case 12:
+                name = "adsp";
+                break;
+            case 13:
+                name = "amidi";
+                break;
+            case 14:
+                name = "admmidi";
+                break;
+            default:
+                {
+                    __unknown:
+                        sprintf(_name, "unknown%d", chain);
+                        if (unit >= SOUND_STEP)
+                                strcat(_name, "-");
+                        name = _name;
+                }
+                break;
+        }
+        return sound_insert_unit(&chains[chain], fops, -1, unit, max_unit,
+                                 name, S_IRUSR | S_IWUSR);
+}
+ 
+EXPORT_SYMBOL(register_sound_special);
+
+/**
+ *      register_sound_mixer - register a mixer device
+ *      @fops: File operations for the driver
+ *      @dev: Unit number to allocate
+ *
+ *      Allocate a mixer device. Unit is the number of the mixer requested.
+ *      Pass -1 to request the next free mixer unit. On success the allocated
+ *      number is returned, on failure a negative error code is returned.
+ */
+
+int register_sound_mixer(struct file_operations *fops, int dev)
+{
+        return sound_insert_unit(&chains[0], fops, dev, 0, 128,
+                                 "mixer", S_IRUSR | S_IWUSR);
+}
+
+EXPORT_SYMBOL(register_sound_mixer);
+
+/**
+ *      register_sound_midi - register a midi device
+ *      @fops: File operations for the driver
+ *      @dev: Unit number to allocate
+ *
+ *      Allocate a midi device. Unit is the number of the midi device requested.
+ *      Pass -1 to request the next free midi unit. On success the allocated
+ *      number is returned, on failure a negative error code is returned.
+ */
+
+int register_sound_midi(struct file_operations *fops, int dev)
+{
+        return sound_insert_unit(&chains[2], fops, dev, 2, 130,
+                                 "midi", S_IRUSR | S_IWUSR);
+}
+
+EXPORT_SYMBOL(register_sound_midi);
+
+/*
+ *      DSP's are registered as a triple. Register only one and cheat
+ *      in open - see below.
+ */
+ 
+/**
+ *      register_sound_dsp - register a DSP device
+ *      @fops: File operations for the driver
+ *      @dev: Unit number to allocate
+ *
+ *      Allocate a DSP device. Unit is the number of the DSP requested.
+ *      Pass -1 to request the next free DSP unit. On success the allocated
+ *      number is returned, on failure a negative error code is returned.
+ *
+ *      This function allocates both the audio and dsp device entries together
+ *      and will always allocate them as a matching pair - eg dsp3/audio3
+ */
+
+int register_sound_dsp(struct file_operations *fops, int dev)
+{
+        return sound_insert_unit(&chains[3], fops, dev, 3, 131,
+                                 "dsp", S_IWUSR | S_IRUSR);
+}
+
+EXPORT_SYMBOL(register_sound_dsp);
+
+/**
+ *      register_sound_synth - register a synth device
+ *      @fops: File operations for the driver
+ *      @dev: Unit number to allocate
+ *
+ *      Allocate a synth device. Unit is the number of the synth device requested.
+ *      Pass -1 to request the next free synth unit. On success the allocated
+ *      number is returned, on failure a negative error code is returned.
+ */
+
+
+int register_sound_synth(struct file_operations *fops, int dev)
+{
+        return sound_insert_unit(&chains[9], fops, dev, 9, 137,
+                                 "synth", S_IRUSR | S_IWUSR);
+}
+
+EXPORT_SYMBOL(register_sound_synth);
+
+/**
+ *      unregister_sound_special - unregister a special sound device
+ *      @unit: unit number to allocate
+ *
+ *      Release a sound device that was allocated with
+ *      register_sound_special(). The unit passed is the return value from
+ *      the register function.
+ */
+
+
+void unregister_sound_special(int unit)
+{
+        sound_remove_unit(&chains[unit % SOUND_STEP], unit);
+}
+ 
+EXPORT_SYMBOL(unregister_sound_special);
+
+/**
+ *      unregister_sound_mixer - unregister a mixer
+ *      @unit: unit number to allocate
+ *
+ *      Release a sound device that was allocated with register_sound_mixer().
+ *      The unit passed is the return value from the register function.
+ */
+
+void unregister_sound_mixer(int unit)
+{
+        sound_remove_unit(&chains[0], unit);
+}
+
+EXPORT_SYMBOL(unregister_sound_mixer);
+
+/**
+ *      unregister_sound_midi - unregister a midi device
+ *      @unit: unit number to allocate
+ *
+ *      Release a sound device that was allocated with register_sound_midi().
+ *      The unit passed is the return value from the register function.
+ */
+
+void unregister_sound_midi(int unit)
+{
+        return sound_remove_unit(&chains[2], unit);
+}
+
+EXPORT_SYMBOL(unregister_sound_midi);
+
+/**
+ *      unregister_sound_dsp - unregister a DSP device
+ *      @unit: unit number to allocate
+ *
+ *      Release a sound device that was allocated with register_sound_dsp().
+ *      The unit passed is the return value from the register function.
+ *
+ *      Both of the allocated units are released together automatically.
+ */
+
+void unregister_sound_dsp(int unit)
+{
+        return sound_remove_unit(&chains[3], unit);
+}
+
+
+EXPORT_SYMBOL(unregister_sound_dsp);
+
+/**
+ *      unregister_sound_synth - unregister a synth device
+ *      @unit: unit number to allocate
+ *
+ *      Release a sound device that was allocated with register_sound_synth().
+ *      The unit passed is the return value from the register function.
+ */
+
+void unregister_sound_synth(int unit)
+{
+        return sound_remove_unit(&chains[9], unit);
+}
+
+EXPORT_SYMBOL(unregister_sound_synth);
+
+/*
+ *      Now our file operations
+ */
+
+static int soundcore_open(struct inode *, struct file *);
+
+static struct file_operations soundcore_fops=
+{
+        /* We must have an owner or the module locking fails */
+        .owner  = THIS_MODULE,
+        .open   = soundcore_open,
+};
+
+static struct sound_unit *__look_for_unit(int chain, int unit)
+{
+        struct sound_unit *s;
+        
+        s=chains[chain];
+        while(s && s->unit_minor <= unit)
+        {
+                if(s->unit_minor==unit)
+                        return s;
+                s=s->next;
+        }
+        return NULL;
+}
+
+int soundcore_open(struct inode *inode, struct file *file)
+{
+        int chain;
+        int unit = iminor(inode);
+        struct sound_unit *s;
+        struct file_operations *new_fops = NULL;
+
+        chain=unit&0x0F;
+        if(chain==4 || chain==5)        /* dsp/audio/dsp16 */
+        {
+                unit&=0xF0;
+                unit|=3;
+                chain=3;
+        }
+        
+        spin_lock(&sound_loader_lock);
+        s = __look_for_unit(chain, unit);
+        if (s)
+                new_fops = fops_get(s->unit_fops);
+        if (!new_fops) {
+                spin_unlock(&sound_loader_lock);
+                /*
+                 *  Please, don't change this order or code.
+                 *  For ALSA slot means soundcard and OSS emulation code
+                 *  comes as add-on modules which aren't depend on
+                 *  ALSA toplevel modules for soundcards, thus we need
+                 *  load them at first.   [Jaroslav Kysela <perex@jcu.cz>]
+                 */
+                request_module("sound-slot-%i", unit>>4);
+                request_module("sound-service-%i-%i", unit>>4, chain);
+                spin_lock(&sound_loader_lock);
+                s = __look_for_unit(chain, unit);
+                if (s)
+                        new_fops = fops_get(s->unit_fops);
+        }
+        if (new_fops) {
+                /*
+                 * We rely upon the fact that we can't be unloaded while the
+                 * subdriver is there, so if ->open() is successful we can
+                 * safely drop the reference counter and if it is not we can
+                 * revert to old ->f_op. Ugly, indeed, but that's the cost of
+                 * switching ->f_op in the first place.
+                 */
+                int err = 0;
+                struct file_operations *old_fops = file->f_op;
+                file->f_op = new_fops;
+                spin_unlock(&sound_loader_lock);
+                if(file->f_op->open)
+                        err = file->f_op->open(inode,file);
+                if (err) {
+                        fops_put(file->f_op);
+                        file->f_op = fops_get(old_fops);
+                }
+                fops_put(old_fops);
+                return err;
+        }
+        spin_unlock(&sound_loader_lock);
+        return -ENODEV;
+}
+
+extern int mod_firmware_load(const char *, char **);
+EXPORT_SYMBOL(mod_firmware_load);
+
+
+MODULE_DESCRIPTION("Core sound module");
+MODULE_AUTHOR("Alan Cox");
+MODULE_LICENSE("GPL");
+MODULE_ALIAS_CHARDEV_MAJOR(SOUND_MAJOR);
+
+static void __exit cleanup_soundcore(void)
+{
+        /* We have nothing to really do here - we know the lists must be
+           empty */
+        unregister_chrdev(SOUND_MAJOR, "sound");
+        devfs_remove("sound");
+        class_simple_destroy(sound_class);
+}
+
+static int __init init_soundcore(void)
+{
+        if (register_chrdev(SOUND_MAJOR, "sound", &soundcore_fops)==-1) {
+                printk(KERN_ERR "soundcore: sound device already in use.\n");
+                return -EBUSY;
+        }
+        devfs_mk_dir ("sound");
+        sound_class = class_simple_create(THIS_MODULE, "sound");
+        if (IS_ERR(sound_class))
+                return PTR_ERR(sound_class);
+
+        return 0;
+}
+
+module_init(init_soundcore);
+module_exit(cleanup_soundcore);