![Takashi Iwai](/assets/img/avatar_default.png)
Currently ALSA supports up to 32 card instances when the dynamic minor is used. While 32 cards are usually big enough for normal use cases, there are sometimes weird requirements with more card support. Actually, this limitation, 32, comes from the index option, where you can pass the bit mask to assign the card. Other than that, we can actually give more cards up to the minor number limits (currently 256, which can be extended more, too). This patch adds a new Kconfig to specify the max card numbers, and changes a few places to accept more than 32 cards. The only incompatibility with high card numbers would be the handling of index option. The index option can be still used to pass the bitmask for card assignments, but this works only up to 32 slots. More than 32, no bitmask style option is available but only a single slot can be specified via index option. Signed-off-by: Takashi Iwai <tiwai@suse.de>
997 lines
25 KiB
C
997 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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/* locked for registering/using */
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static DECLARE_BITMAP(snd_cards_lock, SNDRV_CARDS);
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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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* Return: 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 (idx2 < sizeof(int) && !(idx & (1U << idx2)))
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continue;
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if (!test_bit(idx2, snd_cards_lock)) {
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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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}
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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 (idx2 < sizeof(int) && !(idx & (1U << idx2)))
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continue;
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if (!test_bit(idx2, snd_cards_lock)) {
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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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}
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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 (test_bit(idx, snd_cards_lock))
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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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set_bit(idx, snd_cards_lock); /* 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 = test_bit(card, snd_cards_lock);
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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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* Return: 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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clear_bit(card->number, snd_cards_lock);
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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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* Return: 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));
|
|
snd_card_do_free(card);
|
|
return 0;
|
|
}
|
|
|
|
EXPORT_SYMBOL(snd_card_free);
|
|
|
|
/* retrieve the last word of shortname or longname */
|
|
static const char *retrieve_id_from_card_name(const char *name)
|
|
{
|
|
const char *spos = name;
|
|
|
|
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 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;
|
|
}
|
|
|
|
len = strlen(id);
|
|
for (loops = 0; loops < SNDRV_CARDS; loops++) {
|
|
char *spos;
|
|
char sfxstr[5]; /* "_012" */
|
|
int sfxlen;
|
|
|
|
if (card_id_ok(card, id))
|
|
return; /* OK */
|
|
|
|
/* Add _XYZ suffix */
|
|
sprintf(sfxstr, "_%X", loops + 1);
|
|
sfxlen = strlen(sfxstr);
|
|
if (len + sfxlen >= sizeof(card->id))
|
|
spos = id + sizeof(card->id) - sfxlen - 1;
|
|
else
|
|
spos = id + len;
|
|
strcpy(spos, sfxstr);
|
|
}
|
|
/* 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.
|
|
*
|
|
* Return: 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.
|
|
*
|
|
* Return: 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.
|
|
*
|
|
* Return: 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.
|
|
*
|
|
* Return: 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.
|
|
*
|
|
* Return: Zero if successful, or a negative error code.
|
|
*
|
|
* 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 */
|