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a0830dbd4e
For more strict protection for wild disconnections, a refcount is introduced to the card instance, and let it up/down when an object is referred via snd_lookup_*() in the open ops. The free-after-last-close check is also changed to check this refcount instead of the empty list, too. Reported-by: Matthieu CASTET <matthieu.castet@parrot.com> Cc: <stable@vger.kernel.org> Signed-off-by: Takashi Iwai <tiwai@suse.de>
992 lines
25 KiB
C
992 lines
25 KiB
C
/*
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* Initialization routines
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* Copyright (c) by Jaroslav Kysela <perex@perex.cz>
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*
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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*
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*/
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#include <linux/init.h>
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#include <linux/sched.h>
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#include <linux/module.h>
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#include <linux/device.h>
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#include <linux/file.h>
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#include <linux/slab.h>
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#include <linux/time.h>
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#include <linux/ctype.h>
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#include <linux/pm.h>
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#include <sound/core.h>
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#include <sound/control.h>
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#include <sound/info.h>
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/* monitor files for graceful shutdown (hotplug) */
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struct snd_monitor_file {
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struct file *file;
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const struct file_operations *disconnected_f_op;
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struct list_head shutdown_list; /* still need to shutdown */
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struct list_head list; /* link of monitor files */
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};
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static DEFINE_SPINLOCK(shutdown_lock);
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static LIST_HEAD(shutdown_files);
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static const struct file_operations snd_shutdown_f_ops;
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static unsigned int snd_cards_lock; /* locked for registering/using */
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struct snd_card *snd_cards[SNDRV_CARDS];
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EXPORT_SYMBOL(snd_cards);
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static DEFINE_MUTEX(snd_card_mutex);
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static char *slots[SNDRV_CARDS];
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module_param_array(slots, charp, NULL, 0444);
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MODULE_PARM_DESC(slots, "Module names assigned to the slots.");
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/* return non-zero if the given index is reserved for the given
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* module via slots option
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*/
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static int module_slot_match(struct module *module, int idx)
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{
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int match = 1;
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#ifdef MODULE
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const char *s1, *s2;
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if (!module || !module->name || !slots[idx])
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return 0;
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s1 = module->name;
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s2 = slots[idx];
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if (*s2 == '!') {
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match = 0; /* negative match */
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s2++;
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}
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/* compare module name strings
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* hyphens are handled as equivalent with underscore
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*/
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for (;;) {
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char c1 = *s1++;
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char c2 = *s2++;
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if (c1 == '-')
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c1 = '_';
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if (c2 == '-')
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c2 = '_';
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if (c1 != c2)
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return !match;
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if (!c1)
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break;
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}
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#endif /* MODULE */
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return match;
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}
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#if defined(CONFIG_SND_MIXER_OSS) || defined(CONFIG_SND_MIXER_OSS_MODULE)
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int (*snd_mixer_oss_notify_callback)(struct snd_card *card, int free_flag);
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EXPORT_SYMBOL(snd_mixer_oss_notify_callback);
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#endif
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#ifdef CONFIG_PROC_FS
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static void snd_card_id_read(struct snd_info_entry *entry,
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struct snd_info_buffer *buffer)
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{
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snd_iprintf(buffer, "%s\n", entry->card->id);
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}
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static inline int init_info_for_card(struct snd_card *card)
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{
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int err;
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struct snd_info_entry *entry;
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if ((err = snd_info_card_register(card)) < 0) {
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snd_printd("unable to create card info\n");
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return err;
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}
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if ((entry = snd_info_create_card_entry(card, "id", card->proc_root)) == NULL) {
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snd_printd("unable to create card entry\n");
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return err;
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}
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entry->c.text.read = snd_card_id_read;
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if (snd_info_register(entry) < 0) {
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snd_info_free_entry(entry);
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entry = NULL;
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}
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card->proc_id = entry;
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return 0;
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}
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#else /* !CONFIG_PROC_FS */
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#define init_info_for_card(card)
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#endif
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/**
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* snd_card_create - create and initialize a soundcard structure
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* @idx: card index (address) [0 ... (SNDRV_CARDS-1)]
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* @xid: card identification (ASCII string)
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* @module: top level module for locking
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* @extra_size: allocate this extra size after the main soundcard structure
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* @card_ret: the pointer to store the created card instance
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*
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* Creates and initializes a soundcard structure.
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*
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* The function allocates snd_card instance via kzalloc with the given
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* space for the driver to use freely. The allocated struct is stored
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* in the given card_ret pointer.
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*
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* Returns zero if successful or a negative error code.
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*/
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int snd_card_create(int idx, const char *xid,
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struct module *module, int extra_size,
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struct snd_card **card_ret)
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{
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struct snd_card *card;
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int err, idx2;
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if (snd_BUG_ON(!card_ret))
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return -EINVAL;
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*card_ret = NULL;
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if (extra_size < 0)
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extra_size = 0;
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card = kzalloc(sizeof(*card) + extra_size, GFP_KERNEL);
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if (!card)
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return -ENOMEM;
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if (xid)
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strlcpy(card->id, xid, sizeof(card->id));
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err = 0;
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mutex_lock(&snd_card_mutex);
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if (idx < 0) {
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for (idx2 = 0; idx2 < SNDRV_CARDS; idx2++)
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/* idx == -1 == 0xffff means: take any free slot */
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if (~snd_cards_lock & idx & 1<<idx2) {
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if (module_slot_match(module, idx2)) {
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idx = idx2;
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break;
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}
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}
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}
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if (idx < 0) {
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for (idx2 = 0; idx2 < SNDRV_CARDS; idx2++)
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/* idx == -1 == 0xffff means: take any free slot */
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if (~snd_cards_lock & idx & 1<<idx2) {
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if (!slots[idx2] || !*slots[idx2]) {
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idx = idx2;
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break;
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}
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}
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}
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if (idx < 0)
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err = -ENODEV;
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else if (idx < snd_ecards_limit) {
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if (snd_cards_lock & (1 << idx))
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err = -EBUSY; /* invalid */
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} else if (idx >= SNDRV_CARDS)
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err = -ENODEV;
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if (err < 0) {
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mutex_unlock(&snd_card_mutex);
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snd_printk(KERN_ERR "cannot find the slot for index %d (range 0-%i), error: %d\n",
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idx, snd_ecards_limit - 1, err);
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goto __error;
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}
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snd_cards_lock |= 1 << idx; /* lock it */
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if (idx >= snd_ecards_limit)
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snd_ecards_limit = idx + 1; /* increase the limit */
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mutex_unlock(&snd_card_mutex);
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card->number = idx;
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card->module = module;
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INIT_LIST_HEAD(&card->devices);
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init_rwsem(&card->controls_rwsem);
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rwlock_init(&card->ctl_files_rwlock);
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INIT_LIST_HEAD(&card->controls);
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INIT_LIST_HEAD(&card->ctl_files);
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spin_lock_init(&card->files_lock);
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INIT_LIST_HEAD(&card->files_list);
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init_waitqueue_head(&card->shutdown_sleep);
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atomic_set(&card->refcount, 0);
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#ifdef CONFIG_PM
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mutex_init(&card->power_lock);
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init_waitqueue_head(&card->power_sleep);
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#endif
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/* the control interface cannot be accessed from the user space until */
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/* snd_cards_bitmask and snd_cards are set with snd_card_register */
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err = snd_ctl_create(card);
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if (err < 0) {
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snd_printk(KERN_ERR "unable to register control minors\n");
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goto __error;
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}
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err = snd_info_card_create(card);
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if (err < 0) {
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snd_printk(KERN_ERR "unable to create card info\n");
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goto __error_ctl;
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}
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if (extra_size > 0)
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card->private_data = (char *)card + sizeof(struct snd_card);
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*card_ret = card;
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return 0;
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__error_ctl:
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snd_device_free_all(card, SNDRV_DEV_CMD_PRE);
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__error:
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kfree(card);
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return err;
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}
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EXPORT_SYMBOL(snd_card_create);
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/* return non-zero if a card is already locked */
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int snd_card_locked(int card)
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{
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int locked;
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mutex_lock(&snd_card_mutex);
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locked = snd_cards_lock & (1 << card);
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mutex_unlock(&snd_card_mutex);
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return locked;
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}
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static loff_t snd_disconnect_llseek(struct file *file, loff_t offset, int orig)
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{
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return -ENODEV;
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}
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static ssize_t snd_disconnect_read(struct file *file, char __user *buf,
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size_t count, loff_t *offset)
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{
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return -ENODEV;
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}
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static ssize_t snd_disconnect_write(struct file *file, const char __user *buf,
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size_t count, loff_t *offset)
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{
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return -ENODEV;
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}
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static int snd_disconnect_release(struct inode *inode, struct file *file)
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{
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struct snd_monitor_file *df = NULL, *_df;
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spin_lock(&shutdown_lock);
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list_for_each_entry(_df, &shutdown_files, shutdown_list) {
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if (_df->file == file) {
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df = _df;
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list_del_init(&df->shutdown_list);
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break;
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}
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}
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spin_unlock(&shutdown_lock);
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if (likely(df)) {
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if ((file->f_flags & FASYNC) && df->disconnected_f_op->fasync)
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df->disconnected_f_op->fasync(-1, file, 0);
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return df->disconnected_f_op->release(inode, file);
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}
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panic("%s(%p, %p) failed!", __func__, inode, file);
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}
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static unsigned int snd_disconnect_poll(struct file * file, poll_table * wait)
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{
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return POLLERR | POLLNVAL;
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}
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static long snd_disconnect_ioctl(struct file *file,
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unsigned int cmd, unsigned long arg)
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{
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return -ENODEV;
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}
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static int snd_disconnect_mmap(struct file *file, struct vm_area_struct *vma)
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{
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return -ENODEV;
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}
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static int snd_disconnect_fasync(int fd, struct file *file, int on)
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{
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return -ENODEV;
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}
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static const struct file_operations snd_shutdown_f_ops =
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{
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.owner = THIS_MODULE,
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.llseek = snd_disconnect_llseek,
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.read = snd_disconnect_read,
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.write = snd_disconnect_write,
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.release = snd_disconnect_release,
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.poll = snd_disconnect_poll,
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.unlocked_ioctl = snd_disconnect_ioctl,
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#ifdef CONFIG_COMPAT
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.compat_ioctl = snd_disconnect_ioctl,
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#endif
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.mmap = snd_disconnect_mmap,
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.fasync = snd_disconnect_fasync
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};
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/**
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* snd_card_disconnect - disconnect all APIs from the file-operations (user space)
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* @card: soundcard structure
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*
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* Disconnects all APIs from the file-operations (user space).
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*
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* Returns zero, otherwise a negative error code.
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*
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* Note: The current implementation replaces all active file->f_op with special
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* dummy file operations (they do nothing except release).
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*/
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int snd_card_disconnect(struct snd_card *card)
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{
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struct snd_monitor_file *mfile;
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int err;
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if (!card)
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return -EINVAL;
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spin_lock(&card->files_lock);
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if (card->shutdown) {
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spin_unlock(&card->files_lock);
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return 0;
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}
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card->shutdown = 1;
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spin_unlock(&card->files_lock);
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/* phase 1: disable fops (user space) operations for ALSA API */
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mutex_lock(&snd_card_mutex);
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snd_cards[card->number] = NULL;
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snd_cards_lock &= ~(1 << card->number);
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mutex_unlock(&snd_card_mutex);
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/* phase 2: replace file->f_op with special dummy operations */
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spin_lock(&card->files_lock);
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list_for_each_entry(mfile, &card->files_list, list) {
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/* it's critical part, use endless loop */
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/* we have no room to fail */
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mfile->disconnected_f_op = mfile->file->f_op;
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spin_lock(&shutdown_lock);
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list_add(&mfile->shutdown_list, &shutdown_files);
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spin_unlock(&shutdown_lock);
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mfile->file->f_op = &snd_shutdown_f_ops;
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fops_get(mfile->file->f_op);
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}
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spin_unlock(&card->files_lock);
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/* phase 3: notify all connected devices about disconnection */
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/* at this point, they cannot respond to any calls except release() */
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#if defined(CONFIG_SND_MIXER_OSS) || defined(CONFIG_SND_MIXER_OSS_MODULE)
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if (snd_mixer_oss_notify_callback)
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snd_mixer_oss_notify_callback(card, SND_MIXER_OSS_NOTIFY_DISCONNECT);
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#endif
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/* notify all devices that we are disconnected */
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err = snd_device_disconnect_all(card);
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if (err < 0)
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snd_printk(KERN_ERR "not all devices for card %i can be disconnected\n", card->number);
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snd_info_card_disconnect(card);
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if (card->card_dev) {
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device_unregister(card->card_dev);
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card->card_dev = NULL;
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}
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#ifdef CONFIG_PM
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wake_up(&card->power_sleep);
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#endif
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return 0;
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}
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EXPORT_SYMBOL(snd_card_disconnect);
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/**
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* snd_card_free - frees given soundcard structure
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* @card: soundcard structure
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*
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* This function releases the soundcard structure and the all assigned
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* devices automatically. That is, you don't have to release the devices
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* by yourself.
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*
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* Returns zero. Frees all associated devices and frees the control
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* interface associated to given soundcard.
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*/
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static int snd_card_do_free(struct snd_card *card)
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{
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#if defined(CONFIG_SND_MIXER_OSS) || defined(CONFIG_SND_MIXER_OSS_MODULE)
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if (snd_mixer_oss_notify_callback)
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snd_mixer_oss_notify_callback(card, SND_MIXER_OSS_NOTIFY_FREE);
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#endif
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if (snd_device_free_all(card, SNDRV_DEV_CMD_PRE) < 0) {
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snd_printk(KERN_ERR "unable to free all devices (pre)\n");
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/* Fatal, but this situation should never occur */
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}
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if (snd_device_free_all(card, SNDRV_DEV_CMD_NORMAL) < 0) {
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snd_printk(KERN_ERR "unable to free all devices (normal)\n");
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/* Fatal, but this situation should never occur */
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}
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if (snd_device_free_all(card, SNDRV_DEV_CMD_POST) < 0) {
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snd_printk(KERN_ERR "unable to free all devices (post)\n");
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/* Fatal, but this situation should never occur */
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}
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if (card->private_free)
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card->private_free(card);
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snd_info_free_entry(card->proc_id);
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if (snd_info_card_free(card) < 0) {
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snd_printk(KERN_WARNING "unable to free card info\n");
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/* Not fatal error */
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}
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kfree(card);
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return 0;
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}
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/**
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* snd_card_unref - release the reference counter
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* @card: the card instance
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*
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* Decrements the reference counter. When it reaches to zero, wake up
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* the sleeper and call the destructor if needed.
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*/
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void snd_card_unref(struct snd_card *card)
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{
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if (atomic_dec_and_test(&card->refcount)) {
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wake_up(&card->shutdown_sleep);
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if (card->free_on_last_close)
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snd_card_do_free(card);
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}
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}
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EXPORT_SYMBOL(snd_card_unref);
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int snd_card_free_when_closed(struct snd_card *card)
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{
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int ret;
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atomic_inc(&card->refcount);
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ret = snd_card_disconnect(card);
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if (ret) {
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atomic_dec(&card->refcount);
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return ret;
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}
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card->free_on_last_close = 1;
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if (atomic_dec_and_test(&card->refcount))
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snd_card_do_free(card);
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return 0;
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}
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EXPORT_SYMBOL(snd_card_free_when_closed);
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int snd_card_free(struct snd_card *card)
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{
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int ret = snd_card_disconnect(card);
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if (ret)
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return ret;
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/* wait, until all devices are ready for the free operation */
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wait_event(card->shutdown_sleep, !atomic_read(&card->refcount));
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snd_card_do_free(card);
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return 0;
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}
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EXPORT_SYMBOL(snd_card_free);
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/* retrieve the last word of shortname or longname */
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static const char *retrieve_id_from_card_name(const char *name)
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{
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const char *spos = name;
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while (*name) {
|
|
if (isspace(*name) && isalnum(name[1]))
|
|
spos = name + 1;
|
|
name++;
|
|
}
|
|
return spos;
|
|
}
|
|
|
|
/* return true if the given id string doesn't conflict any other card ids */
|
|
static bool card_id_ok(struct snd_card *card, const char *id)
|
|
{
|
|
int i;
|
|
if (!snd_info_check_reserved_words(id))
|
|
return false;
|
|
for (i = 0; i < snd_ecards_limit; i++) {
|
|
if (snd_cards[i] && snd_cards[i] != card &&
|
|
!strcmp(snd_cards[i]->id, id))
|
|
return false;
|
|
}
|
|
return true;
|
|
}
|
|
|
|
/* copy to card->id only with valid letters from nid */
|
|
static void copy_valid_id_string(struct snd_card *card, const char *src,
|
|
const char *nid)
|
|
{
|
|
char *id = card->id;
|
|
|
|
while (*nid && !isalnum(*nid))
|
|
nid++;
|
|
if (isdigit(*nid))
|
|
*id++ = isalpha(*src) ? *src : 'D';
|
|
while (*nid && (size_t)(id - card->id) < sizeof(card->id) - 1) {
|
|
if (isalnum(*nid))
|
|
*id++ = *nid;
|
|
nid++;
|
|
}
|
|
*id = 0;
|
|
}
|
|
|
|
/* Set card->id from the given string
|
|
* If the string conflicts with other ids, add a suffix to make it unique.
|
|
*/
|
|
static void snd_card_set_id_no_lock(struct snd_card *card, const char *src,
|
|
const char *nid)
|
|
{
|
|
int len, loops;
|
|
bool with_suffix;
|
|
bool is_default = false;
|
|
char *id;
|
|
|
|
copy_valid_id_string(card, src, nid);
|
|
id = card->id;
|
|
|
|
again:
|
|
/* use "Default" for obviously invalid strings
|
|
* ("card" conflicts with proc directories)
|
|
*/
|
|
if (!*id || !strncmp(id, "card", 4)) {
|
|
strcpy(id, "Default");
|
|
is_default = true;
|
|
}
|
|
|
|
with_suffix = false;
|
|
for (loops = 0; loops < SNDRV_CARDS; loops++) {
|
|
if (card_id_ok(card, id))
|
|
return; /* OK */
|
|
|
|
len = strlen(id);
|
|
if (!with_suffix) {
|
|
/* add the "_X" suffix */
|
|
char *spos = id + len;
|
|
if (len > sizeof(card->id) - 3)
|
|
spos = id + sizeof(card->id) - 3;
|
|
strcpy(spos, "_1");
|
|
with_suffix = true;
|
|
} else {
|
|
/* modify the existing suffix */
|
|
if (id[len - 1] != '9')
|
|
id[len - 1]++;
|
|
else
|
|
id[len - 1] = 'A';
|
|
}
|
|
}
|
|
/* fallback to the default id */
|
|
if (!is_default) {
|
|
*id = 0;
|
|
goto again;
|
|
}
|
|
/* last resort... */
|
|
snd_printk(KERN_ERR "unable to set card id (%s)\n", id);
|
|
if (card->proc_root->name)
|
|
strcpy(card->id, card->proc_root->name);
|
|
}
|
|
|
|
/**
|
|
* snd_card_set_id - set card identification name
|
|
* @card: soundcard structure
|
|
* @nid: new identification string
|
|
*
|
|
* This function sets the card identification and checks for name
|
|
* collisions.
|
|
*/
|
|
void snd_card_set_id(struct snd_card *card, const char *nid)
|
|
{
|
|
/* check if user specified own card->id */
|
|
if (card->id[0] != '\0')
|
|
return;
|
|
mutex_lock(&snd_card_mutex);
|
|
snd_card_set_id_no_lock(card, nid, nid);
|
|
mutex_unlock(&snd_card_mutex);
|
|
}
|
|
EXPORT_SYMBOL(snd_card_set_id);
|
|
|
|
static ssize_t
|
|
card_id_show_attr(struct device *dev,
|
|
struct device_attribute *attr, char *buf)
|
|
{
|
|
struct snd_card *card = dev_get_drvdata(dev);
|
|
return snprintf(buf, PAGE_SIZE, "%s\n", card ? card->id : "(null)");
|
|
}
|
|
|
|
static ssize_t
|
|
card_id_store_attr(struct device *dev, struct device_attribute *attr,
|
|
const char *buf, size_t count)
|
|
{
|
|
struct snd_card *card = dev_get_drvdata(dev);
|
|
char buf1[sizeof(card->id)];
|
|
size_t copy = count > sizeof(card->id) - 1 ?
|
|
sizeof(card->id) - 1 : count;
|
|
size_t idx;
|
|
int c;
|
|
|
|
for (idx = 0; idx < copy; idx++) {
|
|
c = buf[idx];
|
|
if (!isalnum(c) && c != '_' && c != '-')
|
|
return -EINVAL;
|
|
}
|
|
memcpy(buf1, buf, copy);
|
|
buf1[copy] = '\0';
|
|
mutex_lock(&snd_card_mutex);
|
|
if (!card_id_ok(NULL, buf1)) {
|
|
mutex_unlock(&snd_card_mutex);
|
|
return -EEXIST;
|
|
}
|
|
strcpy(card->id, buf1);
|
|
snd_info_card_id_change(card);
|
|
mutex_unlock(&snd_card_mutex);
|
|
|
|
return count;
|
|
}
|
|
|
|
static struct device_attribute card_id_attrs =
|
|
__ATTR(id, S_IRUGO | S_IWUSR, card_id_show_attr, card_id_store_attr);
|
|
|
|
static ssize_t
|
|
card_number_show_attr(struct device *dev,
|
|
struct device_attribute *attr, char *buf)
|
|
{
|
|
struct snd_card *card = dev_get_drvdata(dev);
|
|
return snprintf(buf, PAGE_SIZE, "%i\n", card ? card->number : -1);
|
|
}
|
|
|
|
static struct device_attribute card_number_attrs =
|
|
__ATTR(number, S_IRUGO, card_number_show_attr, NULL);
|
|
|
|
/**
|
|
* 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.
|
|
*
|
|
* Returns zero otherwise a negative error code if the registration failed.
|
|
*/
|
|
int snd_card_register(struct snd_card *card)
|
|
{
|
|
int err;
|
|
|
|
if (snd_BUG_ON(!card))
|
|
return -EINVAL;
|
|
|
|
if (!card->card_dev) {
|
|
card->card_dev = device_create(sound_class, card->dev,
|
|
MKDEV(0, 0), card,
|
|
"card%i", card->number);
|
|
if (IS_ERR(card->card_dev))
|
|
card->card_dev = NULL;
|
|
}
|
|
|
|
if ((err = snd_device_register_all(card)) < 0)
|
|
return err;
|
|
mutex_lock(&snd_card_mutex);
|
|
if (snd_cards[card->number]) {
|
|
/* already registered */
|
|
mutex_unlock(&snd_card_mutex);
|
|
return 0;
|
|
}
|
|
if (*card->id) {
|
|
/* make a unique id name from the given string */
|
|
char tmpid[sizeof(card->id)];
|
|
memcpy(tmpid, card->id, sizeof(card->id));
|
|
snd_card_set_id_no_lock(card, tmpid, tmpid);
|
|
} else {
|
|
/* create an id from either shortname or longname */
|
|
const char *src;
|
|
src = *card->shortname ? card->shortname : card->longname;
|
|
snd_card_set_id_no_lock(card, src,
|
|
retrieve_id_from_card_name(src));
|
|
}
|
|
snd_cards[card->number] = card;
|
|
mutex_unlock(&snd_card_mutex);
|
|
init_info_for_card(card);
|
|
#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_REGISTER);
|
|
#endif
|
|
if (card->card_dev) {
|
|
err = device_create_file(card->card_dev, &card_id_attrs);
|
|
if (err < 0)
|
|
return err;
|
|
err = device_create_file(card->card_dev, &card_number_attrs);
|
|
if (err < 0)
|
|
return err;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
EXPORT_SYMBOL(snd_card_register);
|
|
|
|
#ifdef CONFIG_PROC_FS
|
|
static struct snd_info_entry *snd_card_info_entry;
|
|
|
|
static void snd_card_info_read(struct snd_info_entry *entry,
|
|
struct snd_info_buffer *buffer)
|
|
{
|
|
int idx, count;
|
|
struct snd_card *card;
|
|
|
|
for (idx = count = 0; idx < SNDRV_CARDS; idx++) {
|
|
mutex_lock(&snd_card_mutex);
|
|
if ((card = snd_cards[idx]) != NULL) {
|
|
count++;
|
|
snd_iprintf(buffer, "%2i [%-15s]: %s - %s\n",
|
|
idx,
|
|
card->id,
|
|
card->driver,
|
|
card->shortname);
|
|
snd_iprintf(buffer, " %s\n",
|
|
card->longname);
|
|
}
|
|
mutex_unlock(&snd_card_mutex);
|
|
}
|
|
if (!count)
|
|
snd_iprintf(buffer, "--- no soundcards ---\n");
|
|
}
|
|
|
|
#ifdef CONFIG_SND_OSSEMUL
|
|
|
|
void snd_card_info_read_oss(struct snd_info_buffer *buffer)
|
|
{
|
|
int idx, count;
|
|
struct snd_card *card;
|
|
|
|
for (idx = count = 0; idx < SNDRV_CARDS; idx++) {
|
|
mutex_lock(&snd_card_mutex);
|
|
if ((card = snd_cards[idx]) != NULL) {
|
|
count++;
|
|
snd_iprintf(buffer, "%s\n", card->longname);
|
|
}
|
|
mutex_unlock(&snd_card_mutex);
|
|
}
|
|
if (!count) {
|
|
snd_iprintf(buffer, "--- no soundcards ---\n");
|
|
}
|
|
}
|
|
|
|
#endif
|
|
|
|
#ifdef MODULE
|
|
static struct snd_info_entry *snd_card_module_info_entry;
|
|
static void snd_card_module_info_read(struct snd_info_entry *entry,
|
|
struct snd_info_buffer *buffer)
|
|
{
|
|
int idx;
|
|
struct snd_card *card;
|
|
|
|
for (idx = 0; idx < SNDRV_CARDS; idx++) {
|
|
mutex_lock(&snd_card_mutex);
|
|
if ((card = snd_cards[idx]) != NULL)
|
|
snd_iprintf(buffer, "%2i %s\n",
|
|
idx, card->module->name);
|
|
mutex_unlock(&snd_card_mutex);
|
|
}
|
|
}
|
|
#endif
|
|
|
|
int __init snd_card_info_init(void)
|
|
{
|
|
struct snd_info_entry *entry;
|
|
|
|
entry = snd_info_create_module_entry(THIS_MODULE, "cards", NULL);
|
|
if (! entry)
|
|
return -ENOMEM;
|
|
entry->c.text.read = snd_card_info_read;
|
|
if (snd_info_register(entry) < 0) {
|
|
snd_info_free_entry(entry);
|
|
return -ENOMEM;
|
|
}
|
|
snd_card_info_entry = entry;
|
|
|
|
#ifdef MODULE
|
|
entry = snd_info_create_module_entry(THIS_MODULE, "modules", NULL);
|
|
if (entry) {
|
|
entry->c.text.read = snd_card_module_info_read;
|
|
if (snd_info_register(entry) < 0)
|
|
snd_info_free_entry(entry);
|
|
else
|
|
snd_card_module_info_entry = entry;
|
|
}
|
|
#endif
|
|
|
|
return 0;
|
|
}
|
|
|
|
int __exit snd_card_info_done(void)
|
|
{
|
|
snd_info_free_entry(snd_card_info_entry);
|
|
#ifdef MODULE
|
|
snd_info_free_entry(snd_card_module_info_entry);
|
|
#endif
|
|
return 0;
|
|
}
|
|
|
|
#endif /* CONFIG_PROC_FS */
|
|
|
|
/**
|
|
* snd_component_add - add a component string
|
|
* @card: soundcard structure
|
|
* @component: the component id string
|
|
*
|
|
* This function adds the component id string to the supported list.
|
|
* The component can be referred from the alsa-lib.
|
|
*
|
|
* Returns zero otherwise a negative error code.
|
|
*/
|
|
|
|
int snd_component_add(struct snd_card *card, const char *component)
|
|
{
|
|
char *ptr;
|
|
int len = strlen(component);
|
|
|
|
ptr = strstr(card->components, component);
|
|
if (ptr != NULL) {
|
|
if (ptr[len] == '\0' || ptr[len] == ' ') /* already there */
|
|
return 1;
|
|
}
|
|
if (strlen(card->components) + 1 + len + 1 > sizeof(card->components)) {
|
|
snd_BUG();
|
|
return -ENOMEM;
|
|
}
|
|
if (card->components[0] != '\0')
|
|
strcat(card->components, " ");
|
|
strcat(card->components, component);
|
|
return 0;
|
|
}
|
|
|
|
EXPORT_SYMBOL(snd_component_add);
|
|
|
|
/**
|
|
* snd_card_file_add - add the file to the file list of the card
|
|
* @card: soundcard structure
|
|
* @file: file pointer
|
|
*
|
|
* This function adds the file to the file linked-list of the card.
|
|
* This linked-list is used to keep tracking the connection state,
|
|
* and to avoid the release of busy resources by hotplug.
|
|
*
|
|
* Returns zero or a negative error code.
|
|
*/
|
|
int snd_card_file_add(struct snd_card *card, struct file *file)
|
|
{
|
|
struct snd_monitor_file *mfile;
|
|
|
|
mfile = kmalloc(sizeof(*mfile), GFP_KERNEL);
|
|
if (mfile == NULL)
|
|
return -ENOMEM;
|
|
mfile->file = file;
|
|
mfile->disconnected_f_op = NULL;
|
|
INIT_LIST_HEAD(&mfile->shutdown_list);
|
|
spin_lock(&card->files_lock);
|
|
if (card->shutdown) {
|
|
spin_unlock(&card->files_lock);
|
|
kfree(mfile);
|
|
return -ENODEV;
|
|
}
|
|
list_add(&mfile->list, &card->files_list);
|
|
atomic_inc(&card->refcount);
|
|
spin_unlock(&card->files_lock);
|
|
return 0;
|
|
}
|
|
|
|
EXPORT_SYMBOL(snd_card_file_add);
|
|
|
|
/**
|
|
* snd_card_file_remove - remove the file from the file list
|
|
* @card: soundcard structure
|
|
* @file: file pointer
|
|
*
|
|
* This function removes the file formerly added to the card via
|
|
* snd_card_file_add() function.
|
|
* If all files are removed and snd_card_free_when_closed() was
|
|
* called beforehand, it processes the pending release of
|
|
* resources.
|
|
*
|
|
* Returns zero or a negative error code.
|
|
*/
|
|
int snd_card_file_remove(struct snd_card *card, struct file *file)
|
|
{
|
|
struct snd_monitor_file *mfile, *found = NULL;
|
|
|
|
spin_lock(&card->files_lock);
|
|
list_for_each_entry(mfile, &card->files_list, list) {
|
|
if (mfile->file == file) {
|
|
list_del(&mfile->list);
|
|
spin_lock(&shutdown_lock);
|
|
list_del(&mfile->shutdown_list);
|
|
spin_unlock(&shutdown_lock);
|
|
if (mfile->disconnected_f_op)
|
|
fops_put(mfile->disconnected_f_op);
|
|
found = mfile;
|
|
break;
|
|
}
|
|
}
|
|
spin_unlock(&card->files_lock);
|
|
if (!found) {
|
|
snd_printk(KERN_ERR "ALSA card file remove problem (%p)\n", file);
|
|
return -ENOENT;
|
|
}
|
|
kfree(found);
|
|
snd_card_unref(card);
|
|
return 0;
|
|
}
|
|
|
|
EXPORT_SYMBOL(snd_card_file_remove);
|
|
|
|
#ifdef CONFIG_PM
|
|
/**
|
|
* snd_power_wait - wait until the power-state is changed.
|
|
* @card: soundcard structure
|
|
* @power_state: expected power state
|
|
*
|
|
* Waits until the power-state is changed.
|
|
*
|
|
* Note: the power lock must be active before call.
|
|
*/
|
|
int snd_power_wait(struct snd_card *card, unsigned int power_state)
|
|
{
|
|
wait_queue_t wait;
|
|
int result = 0;
|
|
|
|
/* fastpath */
|
|
if (snd_power_get_state(card) == power_state)
|
|
return 0;
|
|
init_waitqueue_entry(&wait, current);
|
|
add_wait_queue(&card->power_sleep, &wait);
|
|
while (1) {
|
|
if (card->shutdown) {
|
|
result = -ENODEV;
|
|
break;
|
|
}
|
|
if (snd_power_get_state(card) == power_state)
|
|
break;
|
|
set_current_state(TASK_UNINTERRUPTIBLE);
|
|
snd_power_unlock(card);
|
|
schedule_timeout(30 * HZ);
|
|
snd_power_lock(card);
|
|
}
|
|
remove_wait_queue(&card->power_sleep, &wait);
|
|
return result;
|
|
}
|
|
|
|
EXPORT_SYMBOL(snd_power_wait);
|
|
#endif /* CONFIG_PM */
|