diff options
Diffstat (limited to 'ANDROID_3.4.5/sound/sound_core.c')
| -rw-r--r-- | ANDROID_3.4.5/sound/sound_core.c | 670 |
1 files changed, 0 insertions, 670 deletions
diff --git a/ANDROID_3.4.5/sound/sound_core.c b/ANDROID_3.4.5/sound/sound_core.c deleted file mode 100644 index c6e81fb9..00000000 --- a/ANDROID_3.4.5/sound/sound_core.c +++ /dev/null @@ -1,670 +0,0 @@ -/* - * Sound core. This file is composed of two parts. sound_class - * which is common to both OSS and ALSA and OSS sound core which - * is used OSS or emulation of it. - */ - -/* - * First, the common part. - */ -#include <linux/module.h> -#include <linux/device.h> -#include <linux/err.h> -#include <linux/kdev_t.h> -#include <linux/major.h> -#include <sound/core.h> - -#ifdef CONFIG_SOUND_OSS_CORE -static int __init init_oss_soundcore(void); -static void cleanup_oss_soundcore(void); -#else -static inline int init_oss_soundcore(void) { return 0; } -static inline void cleanup_oss_soundcore(void) { } -#endif - -struct class *sound_class; -EXPORT_SYMBOL(sound_class); - -MODULE_DESCRIPTION("Core sound module"); -MODULE_AUTHOR("Alan Cox"); -MODULE_LICENSE("GPL"); - -static char *sound_devnode(struct device *dev, umode_t *mode) -{ - if (MAJOR(dev->devt) == SOUND_MAJOR) - return NULL; - return kasprintf(GFP_KERNEL, "snd/%s", dev_name(dev)); -} - -static int __init init_soundcore(void) -{ - int rc; - - rc = init_oss_soundcore(); - if (rc) - return rc; - - sound_class = class_create(THIS_MODULE, "sound"); - if (IS_ERR(sound_class)) { - cleanup_oss_soundcore(); - return PTR_ERR(sound_class); - } - - sound_class->devnode = sound_devnode; - - return 0; -} - -static void __exit cleanup_soundcore(void) -{ - cleanup_oss_soundcore(); - class_destroy(sound_class); -} - -subsys_initcall(init_soundcore); -module_exit(cleanup_soundcore); - - -#ifdef CONFIG_SOUND_OSS_CORE -/* - * OSS sound core handling. Breaks out sound functions to submodules - * - * Author: Alan Cox <alan@lxorguk.ukuu.org.uk> - * - * 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/init.h> -#include <linux/slab.h> -#include <linux/types.h> -#include <linux/kernel.h> -#include <linux/sound.h> -#include <linux/kmod.h> - -#define SOUND_STEP 16 - -struct sound_unit -{ - int unit_minor; - const 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 - -/* - * By default, OSS sound_core claims full legacy minor range (0-255) - * of SOUND_MAJOR to trap open attempts to any sound minor and - * requests modules using custom sound-slot/service-* module aliases. - * The only benefit of doing this is allowing use of custom module - * aliases instead of the standard char-major-* ones. This behavior - * prevents alternative OSS implementation and is scheduled to be - * removed. - * - * CONFIG_SOUND_OSS_CORE_PRECLAIM and soundcore.preclaim_oss kernel - * parameter are added to allow distros and developers to try and - * switch to alternative implementations without needing to rebuild - * the kernel in the meantime. If preclaim_oss is non-zero, the - * kernel will behave the same as before. All SOUND_MAJOR minors are - * preclaimed and the custom module aliases along with standard chrdev - * ones are emitted if a missing device is opened. If preclaim_oss is - * zero, sound_core only grabs what's actually in use and for missing - * devices only the standard chrdev aliases are requested. - * - * All these clutters are scheduled to be removed along with - * sound-slot/service-* module aliases. Please take a look at - * feature-removal-schedule.txt for details. - */ -#ifdef CONFIG_SOUND_OSS_CORE_PRECLAIM -static int preclaim_oss = 1; -#else -static int preclaim_oss = 0; -#endif - -module_param(preclaim_oss, int, 0444); - -static int soundcore_open(struct inode *, struct file *); - -static const struct file_operations soundcore_fops = -{ - /* We must have an owner or the module locking fails */ - .owner = THIS_MODULE, - .open = soundcore_open, - .llseek = noop_llseek, -}; - -/* - * 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, const 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, const struct file_operations *fops, int index, int low, int top, const char *name, umode_t mode, struct device *dev) -{ - struct sound_unit *s = kmalloc(sizeof(*s), GFP_KERNEL); - int r; - - if (!s) - return -ENOMEM; - - spin_lock(&sound_loader_lock); -retry: - 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); - - if (!preclaim_oss) { - /* - * Something else might have grabbed the minor. If - * first free slot is requested, rescan with @low set - * to the next unit; otherwise, -EBUSY. - */ - r = __register_chrdev(SOUND_MAJOR, s->unit_minor, 1, s->name, - &soundcore_fops); - if (r < 0) { - spin_lock(&sound_loader_lock); - __sound_remove_unit(list, s->unit_minor); - if (index < 0) { - low = s->unit_minor + SOUND_STEP; - goto retry; - } - spin_unlock(&sound_loader_lock); - return -EBUSY; - } - } - - device_create(sound_class, dev, MKDEV(SOUND_MAJOR, s->unit_minor), - NULL, s->name+6); - return s->unit_minor; - -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) { - if (!preclaim_oss) - __unregister_chrdev(SOUND_MAJOR, p->unit_minor, 1, - p->name); - device_destroy(sound_class, 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_device - register a special sound node - * @fops: File operations for the driver - * @unit: Unit number to allocate - * @dev: device pointer - * - * Allocate a special sound device by minor number from the sound - * subsystem. The allocated number is returned on success. On failure - * a negative error code is returned. - */ - -int register_sound_special_device(const struct file_operations *fops, int unit, - struct device *dev) -{ - 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 5: - name = "dspW"; - 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, dev); -} - -EXPORT_SYMBOL(register_sound_special_device); - -int register_sound_special(const struct file_operations *fops, int unit) -{ - return register_sound_special_device(fops, unit, NULL); -} - -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(const struct file_operations *fops, int dev) -{ - return sound_insert_unit(&chains[0], fops, dev, 0, 128, - "mixer", S_IRUSR | S_IWUSR, NULL); -} - -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(const struct file_operations *fops, int dev) -{ - return sound_insert_unit(&chains[2], fops, dev, 2, 130, - "midi", S_IRUSR | S_IWUSR, NULL); -} - -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(const struct file_operations *fops, int dev) -{ - return sound_insert_unit(&chains[3], fops, dev, 3, 131, - "dsp", S_IWUSR | S_IRUSR, NULL); -} - -EXPORT_SYMBOL(register_sound_dsp); - -/** - * 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) -{ - 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) -{ - sound_remove_unit(&chains[3], unit); -} - - -EXPORT_SYMBOL(unregister_sound_dsp); - -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; -} - -static int soundcore_open(struct inode *inode, struct file *file) -{ - int chain; - int unit = iminor(inode); - struct sound_unit *s; - const 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 (preclaim_oss && !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); - - /* - * sound-slot/service-* module aliases are scheduled - * for removal in favor of the standard char-major-* - * module aliases. For the time being, generate both - * the legacy and standard module aliases to ease - * transition. - */ - if (request_module("char-major-%d-%d", SOUND_MAJOR, unit) > 0) - request_module("char-major-%d", SOUND_MAJOR); - - 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; - const 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; -} - -MODULE_ALIAS_CHARDEV_MAJOR(SOUND_MAJOR); - -static void cleanup_oss_soundcore(void) -{ - /* We have nothing to really do here - we know the lists must be - empty */ - unregister_chrdev(SOUND_MAJOR, "sound"); -} - -static int __init init_oss_soundcore(void) -{ - if (preclaim_oss && - register_chrdev(SOUND_MAJOR, "sound", &soundcore_fops) == -1) { - printk(KERN_ERR "soundcore: sound device already in use.\n"); - return -EBUSY; - } - - return 0; -} - -#endif /* CONFIG_SOUND_OSS_CORE */ |