/* * Initialization routines * Copyright (c) by Jaroslav Kysela <perex@suse.cz> * * * 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 * */ #include <sound/driver.h>#include <linux/init.h>#include <linux/sched.h>#include <linux/file.h>#include <linux/slab.h>#include <linux/time.h>#include <linux/ctype.h>#include <linux/pci.h>#include <linux/pm.h> #include <sound/core.h>#include <sound/control.h>#include <sound/info.h> struct snd_shutdown_f_ops { struct file_operations f_ops; struct snd_shutdown_f_ops *next;}; static unsigned int snd_cards_lock; /* locked for registering/using */struct snd_card *snd_cards[SNDRV_CARDS];EXPORT_SYMBOL(snd_cards); static DEFINE_MUTEX(snd_card_mutex); #if defined(CONFIG_SND_MIXER_OSS) || defined(CONFIG_SND_MIXER_OSS_MODULE)int (*snd_mixer_oss_notify_callback)(struct snd_card *card, int free_flag);EXPORT_SYMBOL(snd_mixer_oss_notify_callback);#endif #ifdef CONFIG_PROC_FSstatic void snd_card_id_read(struct snd_info_entry *entry, struct snd_info_buffer *buffer){ snd_iprintf(buffer, "%s\n", entry->card->id);} static inline int init_info_for_card(struct snd_card *card){ int err; struct snd_info_entry *entry; if ((err = snd_info_card_register(card)) < 0) { snd_printd("unable to create card info\n"); return err; } if ((entry = snd_info_create_card_entry(card, "id", card->proc_root)) == NULL) { snd_printd("unable to create card entry\n"); return err; } entry->c.text.read = snd_card_id_read; if (snd_info_register(entry) < 0) { snd_info_free_entry(entry); entry = NULL; } card->proc_id = entry; return 0;}#else /* !CONFIG_PROC_FS */#define init_info_for_card(card)#endif static void snd_card_free_thread(void * __card); /** * snd_card_new - create and initialize a soundcard structure * @idx: card index (address) [0 ... (SNDRV_CARDS-1)] * @xid: card identification (ASCII string) * @module: top level module for locking * @extra_size: allocate this extra size after the main soundcard structure * * Creates and initializes a soundcard structure. * * Returns kmallocated snd_card structure. Creates the ALSA control interface * (which is blocked until snd_card_register function is called). */struct snd_card *snd_card_new(int idx, const char *xid, struct module *module, int extra_size){ struct snd_card *card; int err; if (extra_size < 0) extra_size = 0; card = kzalloc(sizeof(*card) + extra_size, GFP_KERNEL); if (card == NULL) return NULL; if (xid) { if (!snd_info_check_reserved_words(xid)) goto __error; strlcpy(card->id, xid, sizeof(card->id)); } err = 0; mutex_lock(&snd_card_mutex); if (idx < 0) { int idx2; for (idx2 = 0; idx2 < SNDRV_CARDS; idx2++) if (~snd_cards_lock & idx & 1<<idx2) { idx = idx2; if (idx >= snd_ecards_limit) snd_ecards_limit = idx + 1; break; } } else if (idx < snd_ecards_limit) { if (snd_cards_lock & (1 << idx)) err = -ENODEV; /* invalid */ } else if (idx < SNDRV_CARDS) snd_ecards_limit = idx + 1; /* increase the limit */ else err = -ENODEV; if (idx < 0 || err < 0) { mutex_unlock(&snd_card_mutex); snd_printk(KERN_ERR "cannot find the slot for index %d (range 0-%i)\n", idx, snd_ecards_limit - 1); goto __error; } snd_cards_lock |= 1 << idx; /* lock it */ mutex_unlock(&snd_card_mutex); card->number = idx; card->module = module; INIT_LIST_HEAD(&card->devices); init_rwsem(&card->controls_rwsem); rwlock_init(&card->ctl_files_rwlock); INIT_LIST_HEAD(&card->controls); INIT_LIST_HEAD(&card->ctl_files); spin_lock_init(&card->files_lock); init_waitqueue_head(&card->shutdown_sleep); INIT_WORK(&card->free_workq, snd_card_free_thread, card);#ifdef CONFIG_PM mutex_init(&card->power_lock); init_waitqueue_head(&card->power_sleep);#endif /* the control interface cannot be accessed from the user space until */ /* snd_cards_bitmask and snd_cards are set with snd_card_register */ if ((err = snd_ctl_create(card)) < 0) { snd_printd("unable to register control minors\n"); goto __error; } if ((err = snd_info_card_create(card)) < 0) { snd_printd("unable to create card info\n"); goto __error_ctl; } if (extra_size > 0) card->private_data = (char *)card + sizeof(struct snd_card); return card; __error_ctl: snd_device_free_all(card, SNDRV_DEV_CMD_PRE); __error: kfree(card); return NULL;} EXPORT_SYMBOL(snd_card_new); /* return non-zero if a card is already locked */int snd_card_locked(int card){ int locked; mutex_lock(&snd_card_mutex); locked = snd_cards_lock & (1 << card); mutex_unlock(&snd_card_mutex); return locked;} static loff_t snd_disconnect_llseek(struct file *file, loff_t offset, int orig){ return -ENODEV;} static ssize_t snd_disconnect_read(struct file *file, char __user *buf, size_t count, loff_t *offset){ return -ENODEV;} static ssize_t snd_disconnect_write(struct file *file, const char __user *buf, size_t count, loff_t *offset){ return -ENODEV;} static unsigned int snd_disconnect_poll(struct file * file, poll_table * wait){ return POLLERR | POLLNVAL;} static long snd_disconnect_ioctl(struct file *file, unsigned int cmd, unsigned long arg){ return -ENODEV;} static int snd_disconnect_mmap(struct file *file, struct vm_area_struct *vma){ return -ENODEV;} static int snd_disconnect_fasync(int fd, struct file *file, int on){ return -ENODEV;} /** * snd_card_disconnect - disconnect all APIs from the file-operations (user space) * @card: soundcard structure * * Disconnects all APIs from the file-operations (user space). * * Returns zero, otherwise a negative error code. * * Note: The current implementation replaces all active file->f_op with special * dummy file operations (they do nothing except release). */int snd_card_disconnect(struct snd_card *card){ struct snd_monitor_file *mfile; struct file *file; struct snd_shutdown_f_ops *s_f_ops; struct file_operations *f_ops; const struct file_operations *old_f_ops; int err; spin_lock(&card->files_lock); if (card->shutdown) { spin_unlock(&card->files_lock); return 0; } card->shutdown = 1; spin_unlock(&card->files_lock); /* phase 1: disable fops (user space) operations for ALSA API */ mutex_lock(&snd_card_mutex); snd_cards[card->number] = NULL; mutex_unlock(&snd_card_mutex); /* phase 2: replace file->f_op with special dummy operations */ spin_lock(&card->files_lock); mfile = card->files; while (mfile) { file = mfile->file; /* it's critical part, use endless loop */ /* we have no room to fail */ s_f_ops = kmalloc(sizeof(struct snd_shutdown_f_ops), GFP_ATOMIC); if (s_f_ops == NULL) panic("Atomic allocation failed for snd_shutdown_f_ops!"); f_ops = &s_f_ops->f_ops; memset(f_ops, 0, sizeof(*f_ops)); f_ops->owner = file->f_op->owner; f_ops->release = file->f_op->release; f_ops->llseek = snd_disconnect_llseek; f_ops->read = snd_disconnect_read; f_ops->write = snd_disconnect_write; f_ops->poll = snd_disconnect_poll; f_ops->unlocked_ioctl = snd_disconnect_ioctl;#ifdef CONFIG_COMPAT f_ops->compat_ioctl = snd_disconnect_ioctl;#endif f_ops->mmap = snd_disconnect_mmap; f_ops->fasync = snd_disconnect_fasync; s_f_ops->next = card->s_f_ops; card->s_f_ops = s_f_ops; f_ops = fops_get(f_ops); old_f_ops = file->f_op; file->f_op = f_ops; /* must be atomic */ fops_put(old_f_ops); mfile = mfile->next; } spin_unlock(&card->files_lock); /* phase 3: notify all connected devices about disconnection */ /* at this point, they cannot respond to any calls except release() */ #if defined(CONFIG_SND_MIXER_OSS) || defined(CONFIG_SND_MIXER_OSS_MODULE) if (snd_mixer_oss_notify_callback) snd_mixer_oss_notify_callback(card, SND_MIXER_OSS_NOTIFY_DISCONNECT);#endif /* notify all devices that we are disconnected */ err = snd_device_disconnect_all(card); if (err < 0) snd_printk(KERN_ERR "not all devices for card %i can be disconnected\n", card->number); return 0; } EXPORT_SYMBOL(snd_card_disconnect); /** * snd_card_free - frees given soundcard structure * @card: soundcard structure * * This function releases the soundcard structure and the all assigned * devices automatically. That is, you don't have to release the devices * by yourself. * * Returns zero. Frees all associated devices and frees the control * interface associated to given soundcard. */int snd_card_free(struct snd_card *card){ struct snd_shutdown_f_ops *s_f_ops; if (card == NULL) return -EINVAL; mutex_lock(&snd_card_mutex); snd_cards[card->number] = NULL; mutex_unlock(&snd_card_mutex); #ifdef CONFIG_PM wake_up(&card->power_sleep);#endif /* wait, until all devices are ready for the free operation */ wait_event(card->shutdown_sleep, card->files == NULL); #if defined(CONFIG_SND_MIXER_OSS) || defined(CONFIG_SND_MIXER_OSS_MODULE) if (snd_mixer_oss_notify_callback) snd_mixer_oss_notify_callback(card, SND_MIXER_OSS_NOTIFY_FREE);#endif if (snd_device_free_all(card, SNDRV_DEV_CMD_PRE) < 0) { snd_printk(KERN_ERR "unable to free all devices (pre)\n"); /* Fatal, but this situation should never occur */ } if (snd_device_free_all(card, SNDRV_DEV_CMD_NORMAL) < 0) { snd_printk(KERN_ERR "unable to free all devices (normal)\n"); /* Fatal, but this situation should never occur */ } if (snd_device_free_all(card, SNDRV_DEV_CMD_POST) < 0) { snd_printk(KERN_ERR "unable to free all devices (post)\n"); /* Fatal, but this situation should never occur */ } if (card->private_free) card->private_free(card); snd_info_unregister(card->proc_id); if (snd_info_card_free(card) < 0) { snd_printk(KERN_WARNING "unable to free card info\n"); /* Not fatal error */ } while (card->s_f_ops) { s_f_ops = card->s_f_ops; card->s_f_ops = s_f_ops->next; kfree(s_f_ops); } mutex_lock(&snd_card_mutex); snd_cards_lock &= ~(1 << card->number); mutex_unlock(&snd_card_mutex); kfree(card); return 0;} EXPORT_SYMBOL(snd_card_free); static void snd_card_free_thread(void * __card){ struct snd_card *card = __card; struct module * module = card->module; if (!try_module_get(module)) { snd_printk(KERN_ERR "unable to lock toplevel module for card %i in free thread\n", card->number); module = NULL; } snd_card_free(card); module_put(module);} /** * snd_card_free_in_thread - call snd_card_free() in thread * @card: soundcard structure * * This function schedules the call of snd_card_free() function in a * work queue. When all devices are released (non-busy), the work * is woken up and calls snd_card_free(). * * When a card can be disconnected at any time by hotplug service, * this function should be used in disconnect (or detach) callback * instead of calling snd_card_free() directly. * * Returns - zero otherwise a negative error code if the start of thread failed. */int snd_card_free_in_thread(struct snd_card *card){ if (card->files == NULL) { snd_card_free(card); return 0; } if (schedule_work(&card->free_workq)) return 0; snd_printk(KERN_ERR "schedule_work() failed in snd_card_free_in_thread for card %i\n", card->number); /* try to free the structure immediately */ snd_card_free(card); return -EFAULT;} EXPORT_SYMBOL(snd_card_free_in_thread); static void choose_default_id(struct snd_card *card){ int i, len, idx_flag = 0, loops = SNDRV_CARDS; char *id, *spos; id = spos = card->shortname; while (*id != '\0') { if (*id == ' ') spos = id + 1; id++; } id = card->id; while (*spos != '\0' && !isalnum(*spos)) spos++; if (isdigit(*spos)) *id++ = isalpha(card->shortname[0]) ? card->shortname[0] : 'D'; while (*spos != '\0' && (size_t)(id - card->id) < sizeof(card->id) - 1) { if (isalnum(*spos)) *id++ = *spos; spos++; } *id = '\0'; id = card->id; if (*id == '\0') strcpy(id, "default"); while (1) { if (loops-- == 0) { snd_printk(KERN_ERR "unable to choose default card id (%s)\n", id); strcpy(card->id, card->proc_root->name); return; } if (!snd_info_check_reserved_words(id)) goto __change; for (i = 0; i < snd_ecards_limit; i++) { if (snd_cards[i] && !strcmp(snd_cards[i]->id, id)) goto __change; } break; __change: len = strlen(id); if (idx_flag) { if (id[len-1] != '9') id[len-1]++; else id[len-1] = 'A'; } else if ((size_t)len <= sizeof(card->id) - 3) { strcat(id, "_1"); idx_flag++; } else { spos = id + len - 2; if ((size_t)len <= sizeof(card->id) - 2) spos++; *spos++ = '_'; *spos++ = '1'; *spos++ = '\0'; idx_flag++; } }} /** * snd_card_register - register the soundcard * @card: soundcard structure * * This function registers all the devices assigned to the soundcard. * Until calling this, the ALSA control interface is blocked from the * external accesses. Thus, you should call this function at the end * of the initialization of the card.Lines 1–500 of 784. Load more
/* * Initialization routines * Copyright (c) by Jaroslav Kysela <perex@suse.cz> * * * 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 * */ #include <sound/driver.h> #include <linux/init.h> #include <linux/sched.h> #include <linux/file.h> #include <linux/slab.h> #include <linux/time.h> #include <linux/ctype.h> #include <linux/pci.h> #include <linux/pm.h> #include <sound/core.h> #include <sound/control.h> #include <sound/info.h> struct snd_shutdown_f_ops { struct file_operations f_ops; struct snd_shutdown_f_ops *next; }; static unsigned int snd_cards_lock; /* locked for registering/using */ struct snd_card *snd_cards[SNDRV_CARDS]; EXPORT_SYMBOL(snd_cards); static DEFINE_MUTEX(snd_card_mutex); #if defined(CONFIG_SND_MIXER_OSS) || defined(CONFIG_SND_MIXER_OSS_MODULE) int (*snd_mixer_oss_notify_callback)(struct snd_card *card, int free_flag); EXPORT_SYMBOL(snd_mixer_oss_notify_callback); #endif #ifdef CONFIG_PROC_FS static void snd_card_id_read(struct snd_info_entry *entry, struct snd_info_buffer *buffer) { snd_iprintf(buffer, "%s\n", entry->card->id); } static inline int init_info_for_card(struct snd_card *card) { int err; struct snd_info_entry *entry; if ((err = snd_info_card_register(card)) < 0) { snd_printd("unable to create card info\n"); return err; } if ((entry = snd_info_create_card_entry(card, "id", card->proc_root)) == NULL) { snd_printd("unable to create card entry\n"); return err; } entry->c.text.read = snd_card_id_read; if (snd_info_register(entry) < 0) { snd_info_free_entry(entry); entry = NULL; } card->proc_id = entry; return 0; } #else /* !CONFIG_PROC_FS */ #define init_info_for_card(card) #endif static void snd_card_free_thread(void * __card); /** * snd_card_new - create and initialize a soundcard structure * @idx: card index (address) [0 ... (SNDRV_CARDS-1)] * @xid: card identification (ASCII string) * @module: top level module for locking * @extra_size: allocate this extra size after the main soundcard structure * * Creates and initializes a soundcard structure. * * Returns kmallocated snd_card structure. Creates the ALSA control interface * (which is blocked until snd_card_register function is called). */ struct snd_card *snd_card_new(int idx, const char *xid, struct module *module, int extra_size) { struct snd_card *card; int err; if (extra_size < 0) extra_size = 0; card = kzalloc(sizeof(*card) + extra_size, GFP_KERNEL); if (card == NULL) return NULL; if (xid) { if (!snd_info_check_reserved_words(xid)) goto __error; strlcpy(card->id, xid, sizeof(card->id)); } err = 0; mutex_lock(&snd_card_mutex); if (idx < 0) { int idx2; for (idx2 = 0; idx2 < SNDRV_CARDS; idx2++) if (~snd_cards_lock & idx & 1<<idx2) { idx = idx2; if (idx >= snd_ecards_limit) snd_ecards_limit = idx + 1; break; } } else if (idx < snd_ecards_limit) { if (snd_cards_lock & (1 << idx)) err = -ENODEV; /* invalid */ } else if (idx < SNDRV_CARDS) snd_ecards_limit = idx + 1; /* increase the limit */ else err = -ENODEV; if (idx < 0 || err < 0) { mutex_unlock(&snd_card_mutex); snd_printk(KERN_ERR "cannot find the slot for index %d (range 0-%i)\n", idx, snd_ecards_limit - 1); goto __error; } snd_cards_lock |= 1 << idx; /* lock it */ mutex_unlock(&snd_card_mutex); card->number = idx; card->module = module; INIT_LIST_HEAD(&card->devices); init_rwsem(&card->controls_rwsem); rwlock_init(&card->ctl_files_rwlock); INIT_LIST_HEAD(&card->controls); INIT_LIST_HEAD(&card->ctl_files); spin_lock_init(&card->files_lock); init_waitqueue_head(&card->shutdown_sleep); INIT_WORK(&card->free_workq, snd_card_free_thread, card); #ifdef CONFIG_PM mutex_init(&card->power_lock); init_waitqueue_head(&card->power_sleep); #endif /* the control interface cannot be accessed from the user space until */ /* snd_cards_bitmask and snd_cards are set with snd_card_register */ if ((err = snd_ctl_create(card)) < 0) { snd_printd("unable to register control minors\n"); goto __error; } if ((err = snd_info_card_create(card)) < 0) { snd_printd("unable to create card info\n"); goto __error_ctl; } if (extra_size > 0) card->private_data = (char *)card + sizeof(struct snd_card); return card; __error_ctl: snd_device_free_all(card, SNDRV_DEV_CMD_PRE); __error: kfree(card); return NULL; } EXPORT_SYMBOL(snd_card_new); /* return non-zero if a card is already locked */ int snd_card_locked(int card) { int locked; mutex_lock(&snd_card_mutex); locked = snd_cards_lock & (1 << card); mutex_unlock(&snd_card_mutex); return locked; } static loff_t snd_disconnect_llseek(struct file *file, loff_t offset, int orig) { return -ENODEV; } static ssize_t snd_disconnect_read(struct file *file, char __user *buf, size_t count, loff_t *offset) { return -ENODEV; } static ssize_t snd_disconnect_write(struct file *file, const char __user *buf, size_t count, loff_t *offset) { return -ENODEV; } static unsigned int snd_disconnect_poll(struct file * file, poll_table * wait) { return POLLERR | POLLNVAL; } static long snd_disconnect_ioctl(struct file *file, unsigned int cmd, unsigned long arg) { return -ENODEV; } static int snd_disconnect_mmap(struct file *file, struct vm_area_struct *vma) { return -ENODEV; } static int snd_disconnect_fasync(int fd, struct file *file, int on) { return -ENODEV; } /** * snd_card_disconnect - disconnect all APIs from the file-operations (user space) * @card: soundcard structure * * Disconnects all APIs from the file-operations (user space). * * Returns zero, otherwise a negative error code. * * Note: The current implementation replaces all active file->f_op with special * dummy file operations (they do nothing except release). */ int snd_card_disconnect(struct snd_card *card) { struct snd_monitor_file *mfile; struct file *file; struct snd_shutdown_f_ops *s_f_ops; struct file_operations *f_ops; const struct file_operations *old_f_ops; int err; spin_lock(&card->files_lock); if (card->shutdown) { spin_unlock(&card->files_lock); return 0; } card->shutdown = 1; spin_unlock(&card->files_lock); /* phase 1: disable fops (user space) operations for ALSA API */ mutex_lock(&snd_card_mutex); snd_cards[card->number] = NULL; mutex_unlock(&snd_card_mutex); /* phase 2: replace file->f_op with special dummy operations */ spin_lock(&card->files_lock); mfile = card->files; while (mfile) { file = mfile->file; /* it's critical part, use endless loop */ /* we have no room to fail */ s_f_ops = kmalloc(sizeof(struct snd_shutdown_f_ops), GFP_ATOMIC); if (s_f_ops == NULL) panic("Atomic allocation failed for snd_shutdown_f_ops!"); f_ops = &s_f_ops->f_ops; memset(f_ops, 0, sizeof(*f_ops)); f_ops->owner = file->f_op->owner; f_ops->release = file->f_op->release; f_ops->llseek = snd_disconnect_llseek; f_ops->read = snd_disconnect_read; f_ops->write = snd_disconnect_write; f_ops->poll = snd_disconnect_poll; f_ops->unlocked_ioctl = snd_disconnect_ioctl; #ifdef CONFIG_COMPAT f_ops->compat_ioctl = snd_disconnect_ioctl; #endif f_ops->mmap = snd_disconnect_mmap; f_ops->fasync = snd_disconnect_fasync; s_f_ops->next = card->s_f_ops; card->s_f_ops = s_f_ops; f_ops = fops_get(f_ops); old_f_ops = file->f_op; file->f_op = f_ops; /* must be atomic */ fops_put(old_f_ops); mfile = mfile->next; } spin_unlock(&card->files_lock); /* phase 3: notify all connected devices about disconnection */ /* at this point, they cannot respond to any calls except release() */ #if defined(CONFIG_SND_MIXER_OSS) || defined(CONFIG_SND_MIXER_OSS_MODULE) if (snd_mixer_oss_notify_callback) snd_mixer_oss_notify_callback(card, SND_MIXER_OSS_NOTIFY_DISCONNECT); #endif /* notify all devices that we are disconnected */ err = snd_device_disconnect_all(card); if (err < 0) snd_printk(KERN_ERR "not all devices for card %i can be disconnected\n", card->number); return 0; } EXPORT_SYMBOL(snd_card_disconnect); /** * snd_card_free - frees given soundcard structure * @card: soundcard structure * * This function releases the soundcard structure and the all assigned * devices automatically. That is, you don't have to release the devices * by yourself. * * Returns zero. Frees all associated devices and frees the control * interface associated to given soundcard. */ int snd_card_free(struct snd_card *card) { struct snd_shutdown_f_ops *s_f_ops; if (card == NULL) return -EINVAL; mutex_lock(&snd_card_mutex); snd_cards[card->number] = NULL; mutex_unlock(&snd_card_mutex); #ifdef CONFIG_PM wake_up(&card->power_sleep); #endif /* wait, until all devices are ready for the free operation */ wait_event(card->shutdown_sleep, card->files == NULL); #if defined(CONFIG_SND_MIXER_OSS) || defined(CONFIG_SND_MIXER_OSS_MODULE) if (snd_mixer_oss_notify_callback) snd_mixer_oss_notify_callback(card, SND_MIXER_OSS_NOTIFY_FREE); #endif if (snd_device_free_all(card, SNDRV_DEV_CMD_PRE) < 0) { snd_printk(KERN_ERR "unable to free all devices (pre)\n"); /* Fatal, but this situation should never occur */ } if (snd_device_free_all(card, SNDRV_DEV_CMD_NORMAL) < 0) { snd_printk(KERN_ERR "unable to free all devices (normal)\n"); /* Fatal, but this situation should never occur */ } if (snd_device_free_all(card, SNDRV_DEV_CMD_POST) < 0) { snd_printk(KERN_ERR "unable to free all devices (post)\n"); /* Fatal, but this situation should never occur */ } if (card->private_free) card->private_free(card); snd_info_unregister(card->proc_id); if (snd_info_card_free(card) < 0) { snd_printk(KERN_WARNING "unable to free card info\n"); /* Not fatal error */ } while (card->s_f_ops) { s_f_ops = card->s_f_ops; card->s_f_ops = s_f_ops->next; kfree(s_f_ops); } mutex_lock(&snd_card_mutex); snd_cards_lock &= ~(1 << card->number); mutex_unlock(&snd_card_mutex); kfree(card); return 0; } EXPORT_SYMBOL(snd_card_free); static void snd_card_free_thread(void * __card) { struct snd_card *card = __card; struct module * module = card->module; if (!try_module_get(module)) { snd_printk(KERN_ERR "unable to lock toplevel module for card %i in free thread\n", card->number); module = NULL; } snd_card_free(card); module_put(module); } /** * snd_card_free_in_thread - call snd_card_free() in thread * @card: soundcard structure * * This function schedules the call of snd_card_free() function in a * work queue. When all devices are released (non-busy), the work * is woken up and calls snd_card_free(). * * When a card can be disconnected at any time by hotplug service, * this function should be used in disconnect (or detach) callback * instead of calling snd_card_free() directly. * * Returns - zero otherwise a negative error code if the start of thread failed. */ int snd_card_free_in_thread(struct snd_card *card) { if (card->files == NULL) { snd_card_free(card); return 0; } if (schedule_work(&card->free_workq)) return 0; snd_printk(KERN_ERR "schedule_work() failed in snd_card_free_in_thread for card %i\n", card->number); /* try to free the structure immediately */ snd_card_free(card); return -EFAULT; } EXPORT_SYMBOL(snd_card_free_in_thread); static void choose_default_id(struct snd_card *card) { int i, len, idx_flag = 0, loops = SNDRV_CARDS; char *id, *spos; id = spos = card->shortname; while (*id != '\0') { if (*id == ' ') spos = id + 1; id++; } id = card->id; while (*spos != '\0' && !isalnum(*spos)) spos++; if (isdigit(*spos)) *id++ = isalpha(card->shortname[0]) ? card->shortname[0] : 'D'; while (*spos != '\0' && (size_t)(id - card->id) < sizeof(card->id) - 1) { if (isalnum(*spos)) *id++ = *spos; spos++; } *id = '\0'; id = card->id; if (*id == '\0') strcpy(id, "default"); while (1) { if (loops-- == 0) { snd_printk(KERN_ERR "unable to choose default card id (%s)\n", id); strcpy(card->id, card->proc_root->name); return; } if (!snd_info_check_reserved_words(id)) goto __change; for (i = 0; i < snd_ecards_limit; i++) { if (snd_cards[i] && !strcmp(snd_cards[i]->id, id)) goto __change; } break; __change: len = strlen(id); if (idx_flag) { if (id[len-1] != '9') id[len-1]++; else id[len-1] = 'A'; } else if ((size_t)len <= sizeof(card->id) - 3) { strcat(id, "_1"); idx_flag++; } else { spos = id + len - 2; if ((size_t)len <= sizeof(card->id) - 2) spos++; *spos++ = '_'; *spos++ = '1'; *spos++ = '\0'; idx_flag++; } } } /** * snd_card_register - register the soundcard * @card: soundcard structure * * This function registers all the devices assigned to the soundcard. * Until calling this, the ALSA control interface is blocked from the * external accesses. Thus, you should call this function at the end * of the initialization of the card.