diff options
Diffstat (limited to 'sound/core/seq/seq_device.c')
| -rw-r--r-- | sound/core/seq/seq_device.c | 575 |
1 files changed, 0 insertions, 575 deletions
diff --git a/sound/core/seq/seq_device.c b/sound/core/seq/seq_device.c deleted file mode 100644 index 040c60e1da28..000000000000 --- a/sound/core/seq/seq_device.c +++ /dev/null @@ -1,575 +0,0 @@ -/* - * ALSA sequencer device management - * Copyright (c) 1999 by Takashi Iwai <tiwai@suse.de> - * - * 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. - * - * This program is distributed in the hope that it will be useful, - * but WITHOUT ANY WARRANTY; without even the implied warranty of - * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the - * GNU General Public License for more details. - * - * You should have received a copy of the GNU General Public License - * along with this program; if not, write to the Free Software - * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA - * - * - *---------------------------------------------------------------- - * - * This device handler separates the card driver module from sequencer - * stuff (sequencer core, synth drivers, etc), so that user can avoid - * to spend unnecessary resources e.g. if he needs only listening to - * MP3s. - * - * The card (or lowlevel) driver creates a sequencer device entry - * via snd_seq_device_new(). This is an entry pointer to communicate - * with the sequencer device "driver", which is involved with the - * actual part to communicate with the sequencer core. - * Each sequencer device entry has an id string and the corresponding - * driver with the same id is loaded when required. For example, - * lowlevel codes to access emu8000 chip on sbawe card are included in - * emu8000-synth module. To activate this module, the hardware - * resources like i/o port are passed via snd_seq_device argument. - * - */ - -#include <linux/init.h> -#include <linux/module.h> -#include <sound/core.h> -#include <sound/info.h> -#include <sound/seq_device.h> -#include <sound/seq_kernel.h> -#include <sound/initval.h> -#include <linux/kmod.h> -#include <linux/slab.h> -#include <linux/mutex.h> - -MODULE_AUTHOR("Takashi Iwai <tiwai@suse.de>"); -MODULE_DESCRIPTION("ALSA sequencer device management"); -MODULE_LICENSE("GPL"); - -/* driver state */ -#define DRIVER_EMPTY 0 -#define DRIVER_LOADED (1<<0) -#define DRIVER_REQUESTED (1<<1) -#define DRIVER_LOCKED (1<<2) - -struct ops_list { - char id[ID_LEN]; /* driver id */ - int driver; /* driver state */ - int used; /* reference counter */ - int argsize; /* argument size */ - - /* operators */ - struct snd_seq_dev_ops ops; - - /* registered devices */ - struct list_head dev_list; /* list of devices */ - int num_devices; /* number of associated devices */ - int num_init_devices; /* number of initialized devices */ - struct mutex reg_mutex; - - struct list_head list; /* next driver */ -}; - - -static LIST_HEAD(opslist); -static int num_ops; -static DEFINE_MUTEX(ops_mutex); -#ifdef CONFIG_PROC_FS -static struct snd_info_entry *info_entry; -#endif - -/* - * prototypes - */ -static int snd_seq_device_free(struct snd_seq_device *dev); -static int snd_seq_device_dev_free(struct snd_device *device); -static int snd_seq_device_dev_register(struct snd_device *device); -static int snd_seq_device_dev_disconnect(struct snd_device *device); - -static int init_device(struct snd_seq_device *dev, struct ops_list *ops); -static int free_device(struct snd_seq_device *dev, struct ops_list *ops); -static struct ops_list *find_driver(char *id, int create_if_empty); -static struct ops_list *create_driver(char *id); -static void unlock_driver(struct ops_list *ops); -static void remove_drivers(void); - -/* - * show all drivers and their status - */ - -#ifdef CONFIG_PROC_FS -static void snd_seq_device_info(struct snd_info_entry *entry, - struct snd_info_buffer *buffer) -{ - struct ops_list *ops; - - mutex_lock(&ops_mutex); - list_for_each_entry(ops, &opslist, list) { - snd_iprintf(buffer, "snd-%s%s%s%s,%d\n", - ops->id, - ops->driver & DRIVER_LOADED ? ",loaded" : (ops->driver == DRIVER_EMPTY ? ",empty" : ""), - ops->driver & DRIVER_REQUESTED ? ",requested" : "", - ops->driver & DRIVER_LOCKED ? ",locked" : "", - ops->num_devices); - } - mutex_unlock(&ops_mutex); -} -#endif - -/* - * load all registered drivers (called from seq_clientmgr.c) - */ - -#ifdef CONFIG_MODULES -/* avoid auto-loading during module_init() */ -static int snd_seq_in_init; -void snd_seq_autoload_lock(void) -{ - snd_seq_in_init++; -} - -void snd_seq_autoload_unlock(void) -{ - snd_seq_in_init--; -} -#endif - -void snd_seq_device_load_drivers(void) -{ -#ifdef CONFIG_MODULES - struct ops_list *ops; - - /* Calling request_module during module_init() - * may cause blocking. - */ - if (snd_seq_in_init) - return; - - mutex_lock(&ops_mutex); - list_for_each_entry(ops, &opslist, list) { - if (! (ops->driver & DRIVER_LOADED) && - ! (ops->driver & DRIVER_REQUESTED)) { - ops->used++; - mutex_unlock(&ops_mutex); - ops->driver |= DRIVER_REQUESTED; - request_module("snd-%s", ops->id); - mutex_lock(&ops_mutex); - ops->used--; - } - } - mutex_unlock(&ops_mutex); -#endif -} - -/* - * register a sequencer device - * card = card info (NULL allowed) - * device = device number (if any) - * id = id of driver - * result = return pointer (NULL allowed if unnecessary) - */ -int snd_seq_device_new(struct snd_card *card, int device, char *id, int argsize, - struct snd_seq_device **result) -{ - struct snd_seq_device *dev; - struct ops_list *ops; - int err; - static struct snd_device_ops dops = { - .dev_free = snd_seq_device_dev_free, - .dev_register = snd_seq_device_dev_register, - .dev_disconnect = snd_seq_device_dev_disconnect, - }; - - if (result) - *result = NULL; - - if (snd_BUG_ON(!id)) - return -EINVAL; - - ops = find_driver(id, 1); - if (ops == NULL) - return -ENOMEM; - - dev = kzalloc(sizeof(*dev)*2 + argsize, GFP_KERNEL); - if (dev == NULL) { - unlock_driver(ops); - return -ENOMEM; - } - - /* set up device info */ - dev->card = card; - dev->device = device; - strlcpy(dev->id, id, sizeof(dev->id)); - dev->argsize = argsize; - dev->status = SNDRV_SEQ_DEVICE_FREE; - - /* add this device to the list */ - mutex_lock(&ops->reg_mutex); - list_add_tail(&dev->list, &ops->dev_list); - ops->num_devices++; - mutex_unlock(&ops->reg_mutex); - - unlock_driver(ops); - - if ((err = snd_device_new(card, SNDRV_DEV_SEQUENCER, dev, &dops)) < 0) { - snd_seq_device_free(dev); - return err; - } - - if (result) - *result = dev; - - return 0; -} - -/* - * free the existing device - */ -static int snd_seq_device_free(struct snd_seq_device *dev) -{ - struct ops_list *ops; - - if (snd_BUG_ON(!dev)) - return -EINVAL; - - ops = find_driver(dev->id, 0); - if (ops == NULL) - return -ENXIO; - - /* remove the device from the list */ - mutex_lock(&ops->reg_mutex); - list_del(&dev->list); - ops->num_devices--; - mutex_unlock(&ops->reg_mutex); - - free_device(dev, ops); - if (dev->private_free) - dev->private_free(dev); - kfree(dev); - - unlock_driver(ops); - - return 0; -} - -static int snd_seq_device_dev_free(struct snd_device *device) -{ - struct snd_seq_device *dev = device->device_data; - return snd_seq_device_free(dev); -} - -/* - * register the device - */ -static int snd_seq_device_dev_register(struct snd_device *device) -{ - struct snd_seq_device *dev = device->device_data; - struct ops_list *ops; - - ops = find_driver(dev->id, 0); - if (ops == NULL) - return -ENOENT; - - /* initialize this device if the corresponding driver was - * already loaded - */ - if (ops->driver & DRIVER_LOADED) - init_device(dev, ops); - - unlock_driver(ops); - return 0; -} - -/* - * disconnect the device - */ -static int snd_seq_device_dev_disconnect(struct snd_device *device) -{ - struct snd_seq_device *dev = device->device_data; - struct ops_list *ops; - - ops = find_driver(dev->id, 0); - if (ops == NULL) - return -ENOENT; - - free_device(dev, ops); - - unlock_driver(ops); - return 0; -} - -/* - * register device driver - * id = driver id - * entry = driver operators - duplicated to each instance - */ -int snd_seq_device_register_driver(char *id, struct snd_seq_dev_ops *entry, - int argsize) -{ - struct ops_list *ops; - struct snd_seq_device *dev; - - if (id == NULL || entry == NULL || - entry->init_device == NULL || entry->free_device == NULL) - return -EINVAL; - - snd_seq_autoload_lock(); - ops = find_driver(id, 1); - if (ops == NULL) { - snd_seq_autoload_unlock(); - return -ENOMEM; - } - if (ops->driver & DRIVER_LOADED) { - snd_printk(KERN_WARNING "driver_register: driver '%s' already exists\n", id); - unlock_driver(ops); - snd_seq_autoload_unlock(); - return -EBUSY; - } - - mutex_lock(&ops->reg_mutex); - /* copy driver operators */ - ops->ops = *entry; - ops->driver |= DRIVER_LOADED; - ops->argsize = argsize; - - /* initialize existing devices if necessary */ - list_for_each_entry(dev, &ops->dev_list, list) { - init_device(dev, ops); - } - mutex_unlock(&ops->reg_mutex); - - unlock_driver(ops); - snd_seq_autoload_unlock(); - - return 0; -} - - -/* - * create driver record - */ -static struct ops_list * create_driver(char *id) -{ - struct ops_list *ops; - - ops = kzalloc(sizeof(*ops), GFP_KERNEL); - if (ops == NULL) - return ops; - - /* set up driver entry */ - strlcpy(ops->id, id, sizeof(ops->id)); - mutex_init(&ops->reg_mutex); - /* - * The ->reg_mutex locking rules are per-driver, so we create - * separate per-driver lock classes: - */ - lockdep_set_class(&ops->reg_mutex, (struct lock_class_key *)id); - - ops->driver = DRIVER_EMPTY; - INIT_LIST_HEAD(&ops->dev_list); - /* lock this instance */ - ops->used = 1; - - /* register driver entry */ - mutex_lock(&ops_mutex); - list_add_tail(&ops->list, &opslist); - num_ops++; - mutex_unlock(&ops_mutex); - - return ops; -} - - -/* - * unregister the specified driver - */ -int snd_seq_device_unregister_driver(char *id) -{ - struct ops_list *ops; - struct snd_seq_device *dev; - - ops = find_driver(id, 0); - if (ops == NULL) - return -ENXIO; - if (! (ops->driver & DRIVER_LOADED) || - (ops->driver & DRIVER_LOCKED)) { - snd_printk(KERN_ERR "driver_unregister: cannot unload driver '%s': status=%x\n", - id, ops->driver); - unlock_driver(ops); - return -EBUSY; - } - - /* close and release all devices associated with this driver */ - mutex_lock(&ops->reg_mutex); - ops->driver |= DRIVER_LOCKED; /* do not remove this driver recursively */ - list_for_each_entry(dev, &ops->dev_list, list) { - free_device(dev, ops); - } - - ops->driver = 0; - if (ops->num_init_devices > 0) - snd_printk(KERN_ERR "free_driver: init_devices > 0!! (%d)\n", - ops->num_init_devices); - mutex_unlock(&ops->reg_mutex); - - unlock_driver(ops); - - /* remove empty driver entries */ - remove_drivers(); - - return 0; -} - - -/* - * remove empty driver entries - */ -static void remove_drivers(void) -{ - struct list_head *head; - - mutex_lock(&ops_mutex); - head = opslist.next; - while (head != &opslist) { - struct ops_list *ops = list_entry(head, struct ops_list, list); - if (! (ops->driver & DRIVER_LOADED) && - ops->used == 0 && ops->num_devices == 0) { - head = head->next; - list_del(&ops->list); - kfree(ops); - num_ops--; - } else - head = head->next; - } - mutex_unlock(&ops_mutex); -} - -/* - * initialize the device - call init_device operator - */ -static int init_device(struct snd_seq_device *dev, struct ops_list *ops) -{ - if (! (ops->driver & DRIVER_LOADED)) - return 0; /* driver is not loaded yet */ - if (dev->status != SNDRV_SEQ_DEVICE_FREE) - return 0; /* already initialized */ - if (ops->argsize != dev->argsize) { - snd_printk(KERN_ERR "incompatible device '%s' for plug-in '%s' (%d %d)\n", - dev->name, ops->id, ops->argsize, dev->argsize); - return -EINVAL; - } - if (ops->ops.init_device(dev) >= 0) { - dev->status = SNDRV_SEQ_DEVICE_REGISTERED; - ops->num_init_devices++; - } else { - snd_printk(KERN_ERR "init_device failed: %s: %s\n", - dev->name, dev->id); - } - - return 0; -} - -/* - * release the device - call free_device operator - */ -static int free_device(struct snd_seq_device *dev, struct ops_list *ops) -{ - int result; - - if (! (ops->driver & DRIVER_LOADED)) - return 0; /* driver is not loaded yet */ - if (dev->status != SNDRV_SEQ_DEVICE_REGISTERED) - return 0; /* not registered */ - if (ops->argsize != dev->argsize) { - snd_printk(KERN_ERR "incompatible device '%s' for plug-in '%s' (%d %d)\n", - dev->name, ops->id, ops->argsize, dev->argsize); - return -EINVAL; - } - if ((result = ops->ops.free_device(dev)) >= 0 || result == -ENXIO) { - dev->status = SNDRV_SEQ_DEVICE_FREE; - dev->driver_data = NULL; - ops->num_init_devices--; - } else { - snd_printk(KERN_ERR "free_device failed: %s: %s\n", - dev->name, dev->id); - } - - return 0; -} - -/* - * find the matching driver with given id - */ -static struct ops_list * find_driver(char *id, int create_if_empty) -{ - struct ops_list *ops; - - mutex_lock(&ops_mutex); - list_for_each_entry(ops, &opslist, list) { - if (strcmp(ops->id, id) == 0) { - ops->used++; - mutex_unlock(&ops_mutex); - return ops; - } - } - mutex_unlock(&ops_mutex); - if (create_if_empty) - return create_driver(id); - return NULL; -} - -static void unlock_driver(struct ops_list *ops) -{ - mutex_lock(&ops_mutex); - ops->used--; - mutex_unlock(&ops_mutex); -} - - -/* - * module part - */ - -static int __init alsa_seq_device_init(void) -{ -#ifdef CONFIG_PROC_FS - info_entry = snd_info_create_module_entry(THIS_MODULE, "drivers", - snd_seq_root); - if (info_entry == NULL) - return -ENOMEM; - info_entry->content = SNDRV_INFO_CONTENT_TEXT; - info_entry->c.text.read = snd_seq_device_info; - if (snd_info_register(info_entry) < 0) { - snd_info_free_entry(info_entry); - return -ENOMEM; - } -#endif - return 0; -} - -static void __exit alsa_seq_device_exit(void) -{ - remove_drivers(); -#ifdef CONFIG_PROC_FS - snd_info_free_entry(info_entry); -#endif - if (num_ops) - snd_printk(KERN_ERR "drivers not released (%d)\n", num_ops); -} - -module_init(alsa_seq_device_init) -module_exit(alsa_seq_device_exit) - -EXPORT_SYMBOL(snd_seq_device_load_drivers); -EXPORT_SYMBOL(snd_seq_device_new); -EXPORT_SYMBOL(snd_seq_device_register_driver); -EXPORT_SYMBOL(snd_seq_device_unregister_driver); -#ifdef CONFIG_MODULES -EXPORT_SYMBOL(snd_seq_autoload_lock); -EXPORT_SYMBOL(snd_seq_autoload_unlock); -#endif |