forked from luck/tmp_suning_uos_patched
2af677fc88
Instead of a comment string, store the device type in the snd_minor structure. This makes snd_minor more flexible, and has the nice side effect that we don't need anymore to create a separate snd_minor template for registering a device but can pass the file_operations directly to snd_register_device(). Signed-off-by: Clemens Ladisch <clemens@ladisch.de>
1355 lines
35 KiB
C
1355 lines
35 KiB
C
/*
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* Routines for driver control interface
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* Copyright (c) by Jaroslav Kysela <perex@suse.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 <sound/driver.h>
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#include <linux/threads.h>
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#include <linux/interrupt.h>
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#include <linux/smp_lock.h>
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#include <linux/slab.h>
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#include <linux/vmalloc.h>
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#include <linux/time.h>
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#include <sound/core.h>
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#include <sound/minors.h>
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#include <sound/info.h>
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#include <sound/control.h>
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/* max number of user-defined controls */
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#define MAX_USER_CONTROLS 32
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struct snd_kctl_ioctl {
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struct list_head list; /* list of all ioctls */
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snd_kctl_ioctl_func_t fioctl;
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};
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static DECLARE_RWSEM(snd_ioctl_rwsem);
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static LIST_HEAD(snd_control_ioctls);
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#ifdef CONFIG_COMPAT
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static LIST_HEAD(snd_control_compat_ioctls);
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#endif
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static int snd_ctl_open(struct inode *inode, struct file *file)
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{
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int cardnum = SNDRV_MINOR_CARD(iminor(inode));
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unsigned long flags;
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struct snd_card *card;
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struct snd_ctl_file *ctl;
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int err;
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card = snd_cards[cardnum];
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if (!card) {
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err = -ENODEV;
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goto __error1;
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}
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err = snd_card_file_add(card, file);
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if (err < 0) {
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err = -ENODEV;
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goto __error1;
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}
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if (!try_module_get(card->module)) {
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err = -EFAULT;
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goto __error2;
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}
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ctl = kzalloc(sizeof(*ctl), GFP_KERNEL);
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if (ctl == NULL) {
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err = -ENOMEM;
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goto __error;
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}
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INIT_LIST_HEAD(&ctl->events);
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init_waitqueue_head(&ctl->change_sleep);
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spin_lock_init(&ctl->read_lock);
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ctl->card = card;
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ctl->pid = current->pid;
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file->private_data = ctl;
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write_lock_irqsave(&card->ctl_files_rwlock, flags);
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list_add_tail(&ctl->list, &card->ctl_files);
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write_unlock_irqrestore(&card->ctl_files_rwlock, flags);
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return 0;
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__error:
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module_put(card->module);
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__error2:
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snd_card_file_remove(card, file);
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__error1:
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return err;
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}
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static void snd_ctl_empty_read_queue(struct snd_ctl_file * ctl)
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{
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struct snd_kctl_event *cread;
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spin_lock(&ctl->read_lock);
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while (!list_empty(&ctl->events)) {
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cread = snd_kctl_event(ctl->events.next);
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list_del(&cread->list);
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kfree(cread);
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}
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spin_unlock(&ctl->read_lock);
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}
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static int snd_ctl_release(struct inode *inode, struct file *file)
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{
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unsigned long flags;
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struct list_head *list;
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struct snd_card *card;
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struct snd_ctl_file *ctl;
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struct snd_kcontrol *control;
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unsigned int idx;
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ctl = file->private_data;
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fasync_helper(-1, file, 0, &ctl->fasync);
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file->private_data = NULL;
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card = ctl->card;
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write_lock_irqsave(&card->ctl_files_rwlock, flags);
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list_del(&ctl->list);
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write_unlock_irqrestore(&card->ctl_files_rwlock, flags);
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down_write(&card->controls_rwsem);
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list_for_each(list, &card->controls) {
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control = snd_kcontrol(list);
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for (idx = 0; idx < control->count; idx++)
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if (control->vd[idx].owner == ctl)
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control->vd[idx].owner = NULL;
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}
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up_write(&card->controls_rwsem);
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snd_ctl_empty_read_queue(ctl);
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kfree(ctl);
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module_put(card->module);
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snd_card_file_remove(card, file);
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return 0;
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}
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void snd_ctl_notify(struct snd_card *card, unsigned int mask,
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struct snd_ctl_elem_id *id)
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{
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unsigned long flags;
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struct list_head *flist;
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struct snd_ctl_file *ctl;
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struct snd_kctl_event *ev;
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snd_assert(card != NULL && id != NULL, return);
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read_lock(&card->ctl_files_rwlock);
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#if defined(CONFIG_SND_MIXER_OSS) || defined(CONFIG_SND_MIXER_OSS_MODULE)
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card->mixer_oss_change_count++;
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#endif
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list_for_each(flist, &card->ctl_files) {
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struct list_head *elist;
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ctl = snd_ctl_file(flist);
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if (!ctl->subscribed)
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continue;
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spin_lock_irqsave(&ctl->read_lock, flags);
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list_for_each(elist, &ctl->events) {
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ev = snd_kctl_event(elist);
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if (ev->id.numid == id->numid) {
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ev->mask |= mask;
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goto _found;
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}
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}
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ev = kzalloc(sizeof(*ev), GFP_ATOMIC);
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if (ev) {
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ev->id = *id;
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ev->mask = mask;
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list_add_tail(&ev->list, &ctl->events);
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} else {
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snd_printk(KERN_ERR "No memory available to allocate event\n");
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}
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_found:
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wake_up(&ctl->change_sleep);
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spin_unlock_irqrestore(&ctl->read_lock, flags);
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kill_fasync(&ctl->fasync, SIGIO, POLL_IN);
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}
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read_unlock(&card->ctl_files_rwlock);
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}
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/**
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* snd_ctl_new - create a control instance from the template
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* @control: the control template
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* @access: the default control access
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*
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* Allocates a new struct snd_kcontrol instance and copies the given template
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* to the new instance. It does not copy volatile data (access).
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*
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* Returns the pointer of the new instance, or NULL on failure.
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*/
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struct snd_kcontrol *snd_ctl_new(struct snd_kcontrol *control, unsigned int access)
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{
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struct snd_kcontrol *kctl;
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unsigned int idx;
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snd_assert(control != NULL, return NULL);
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snd_assert(control->count > 0, return NULL);
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kctl = kzalloc(sizeof(*kctl) + sizeof(struct snd_kcontrol_volatile) * control->count, GFP_KERNEL);
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if (kctl == NULL) {
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snd_printk(KERN_ERR "Cannot allocate control instance\n");
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return NULL;
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}
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*kctl = *control;
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for (idx = 0; idx < kctl->count; idx++)
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kctl->vd[idx].access = access;
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return kctl;
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}
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/**
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* snd_ctl_new1 - create a control instance from the template
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* @ncontrol: the initialization record
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* @private_data: the private data to set
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*
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* Allocates a new struct snd_kcontrol instance and initialize from the given
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* template. When the access field of ncontrol is 0, it's assumed as
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* READWRITE access. When the count field is 0, it's assumes as one.
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*
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* Returns the pointer of the newly generated instance, or NULL on failure.
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*/
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struct snd_kcontrol *snd_ctl_new1(const struct snd_kcontrol_new *ncontrol,
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void *private_data)
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{
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struct snd_kcontrol kctl;
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unsigned int access;
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snd_assert(ncontrol != NULL, return NULL);
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snd_assert(ncontrol->info != NULL, return NULL);
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memset(&kctl, 0, sizeof(kctl));
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kctl.id.iface = ncontrol->iface;
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kctl.id.device = ncontrol->device;
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kctl.id.subdevice = ncontrol->subdevice;
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if (ncontrol->name)
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strlcpy(kctl.id.name, ncontrol->name, sizeof(kctl.id.name));
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kctl.id.index = ncontrol->index;
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kctl.count = ncontrol->count ? ncontrol->count : 1;
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access = ncontrol->access == 0 ? SNDRV_CTL_ELEM_ACCESS_READWRITE :
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(ncontrol->access & (SNDRV_CTL_ELEM_ACCESS_READWRITE|SNDRV_CTL_ELEM_ACCESS_INACTIVE|
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SNDRV_CTL_ELEM_ACCESS_DINDIRECT|SNDRV_CTL_ELEM_ACCESS_INDIRECT));
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kctl.info = ncontrol->info;
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kctl.get = ncontrol->get;
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kctl.put = ncontrol->put;
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kctl.private_value = ncontrol->private_value;
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kctl.private_data = private_data;
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return snd_ctl_new(&kctl, access);
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}
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/**
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* snd_ctl_free_one - release the control instance
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* @kcontrol: the control instance
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*
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* Releases the control instance created via snd_ctl_new()
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* or snd_ctl_new1().
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* Don't call this after the control was added to the card.
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*/
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void snd_ctl_free_one(struct snd_kcontrol *kcontrol)
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{
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if (kcontrol) {
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if (kcontrol->private_free)
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kcontrol->private_free(kcontrol);
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kfree(kcontrol);
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}
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}
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static unsigned int snd_ctl_hole_check(struct snd_card *card,
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unsigned int count)
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{
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struct list_head *list;
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struct snd_kcontrol *kctl;
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list_for_each(list, &card->controls) {
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kctl = snd_kcontrol(list);
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if ((kctl->id.numid <= card->last_numid &&
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kctl->id.numid + kctl->count > card->last_numid) ||
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(kctl->id.numid <= card->last_numid + count - 1 &&
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kctl->id.numid + kctl->count > card->last_numid + count - 1))
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return card->last_numid = kctl->id.numid + kctl->count - 1;
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}
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return card->last_numid;
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}
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static int snd_ctl_find_hole(struct snd_card *card, unsigned int count)
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{
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unsigned int last_numid, iter = 100000;
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last_numid = card->last_numid;
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while (last_numid != snd_ctl_hole_check(card, count)) {
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if (--iter == 0) {
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/* this situation is very unlikely */
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snd_printk(KERN_ERR "unable to allocate new control numid\n");
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return -ENOMEM;
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}
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last_numid = card->last_numid;
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}
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return 0;
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}
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/**
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* snd_ctl_add - add the control instance to the card
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* @card: the card instance
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* @kcontrol: the control instance to add
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*
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* Adds the control instance created via snd_ctl_new() or
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* snd_ctl_new1() to the given card. Assigns also an unique
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* numid used for fast search.
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*
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* Returns zero if successful, or a negative error code on failure.
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*
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* It frees automatically the control which cannot be added.
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*/
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int snd_ctl_add(struct snd_card *card, struct snd_kcontrol *kcontrol)
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{
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struct snd_ctl_elem_id id;
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unsigned int idx;
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snd_assert(card != NULL, return -EINVAL);
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if (! kcontrol)
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return -EINVAL;
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snd_assert(kcontrol->info != NULL, return -EINVAL);
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id = kcontrol->id;
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down_write(&card->controls_rwsem);
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if (snd_ctl_find_id(card, &id)) {
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up_write(&card->controls_rwsem);
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snd_ctl_free_one(kcontrol);
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snd_printd(KERN_ERR "control %i:%i:%i:%s:%i is already present\n",
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id.iface,
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id.device,
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id.subdevice,
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id.name,
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id.index);
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return -EBUSY;
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}
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if (snd_ctl_find_hole(card, kcontrol->count) < 0) {
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up_write(&card->controls_rwsem);
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snd_ctl_free_one(kcontrol);
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return -ENOMEM;
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}
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list_add_tail(&kcontrol->list, &card->controls);
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card->controls_count += kcontrol->count;
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kcontrol->id.numid = card->last_numid + 1;
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card->last_numid += kcontrol->count;
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up_write(&card->controls_rwsem);
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for (idx = 0; idx < kcontrol->count; idx++, id.index++, id.numid++)
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snd_ctl_notify(card, SNDRV_CTL_EVENT_MASK_ADD, &id);
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return 0;
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}
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/**
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* snd_ctl_remove - remove the control from the card and release it
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* @card: the card instance
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* @kcontrol: the control instance to remove
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*
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* Removes the control from the card and then releases the instance.
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* You don't need to call snd_ctl_free_one(). You must be in
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* the write lock - down_write(&card->controls_rwsem).
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*
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* Returns 0 if successful, or a negative error code on failure.
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*/
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int snd_ctl_remove(struct snd_card *card, struct snd_kcontrol *kcontrol)
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{
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struct snd_ctl_elem_id id;
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unsigned int idx;
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snd_assert(card != NULL && kcontrol != NULL, return -EINVAL);
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list_del(&kcontrol->list);
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card->controls_count -= kcontrol->count;
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id = kcontrol->id;
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for (idx = 0; idx < kcontrol->count; idx++, id.index++, id.numid++)
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snd_ctl_notify(card, SNDRV_CTL_EVENT_MASK_REMOVE, &id);
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snd_ctl_free_one(kcontrol);
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return 0;
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}
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/**
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* snd_ctl_remove_id - remove the control of the given id and release it
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* @card: the card instance
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* @id: the control id to remove
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*
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* Finds the control instance with the given id, removes it from the
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* card list and releases it.
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*
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* Returns 0 if successful, or a negative error code on failure.
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*/
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int snd_ctl_remove_id(struct snd_card *card, struct snd_ctl_elem_id *id)
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{
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struct snd_kcontrol *kctl;
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int ret;
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down_write(&card->controls_rwsem);
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kctl = snd_ctl_find_id(card, id);
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if (kctl == NULL) {
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up_write(&card->controls_rwsem);
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return -ENOENT;
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}
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ret = snd_ctl_remove(card, kctl);
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up_write(&card->controls_rwsem);
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return ret;
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}
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/**
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* snd_ctl_remove_unlocked_id - remove the unlocked control of the given id and release it
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* @file: active control handle
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* @id: the control id to remove
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*
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* Finds the control instance with the given id, removes it from the
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* card list and releases it.
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*
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* Returns 0 if successful, or a negative error code on failure.
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*/
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static int snd_ctl_remove_unlocked_id(struct snd_ctl_file * file,
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struct snd_ctl_elem_id *id)
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{
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struct snd_card *card = file->card;
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struct snd_kcontrol *kctl;
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int idx, ret;
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down_write(&card->controls_rwsem);
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kctl = snd_ctl_find_id(card, id);
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if (kctl == NULL) {
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up_write(&card->controls_rwsem);
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return -ENOENT;
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}
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for (idx = 0; idx < kctl->count; idx++)
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if (kctl->vd[idx].owner != NULL && kctl->vd[idx].owner != file) {
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up_write(&card->controls_rwsem);
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return -EBUSY;
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}
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ret = snd_ctl_remove(card, kctl);
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up_write(&card->controls_rwsem);
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return ret;
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}
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|
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/**
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* snd_ctl_rename_id - replace the id of a control on the card
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* @card: the card instance
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* @src_id: the old id
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* @dst_id: the new id
|
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*
|
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* Finds the control with the old id from the card, and replaces the
|
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* id with the new one.
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*
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* Returns zero if successful, or a negative error code on failure.
|
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*/
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int snd_ctl_rename_id(struct snd_card *card, struct snd_ctl_elem_id *src_id,
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struct snd_ctl_elem_id *dst_id)
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{
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struct snd_kcontrol *kctl;
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down_write(&card->controls_rwsem);
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kctl = snd_ctl_find_id(card, src_id);
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if (kctl == NULL) {
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up_write(&card->controls_rwsem);
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return -ENOENT;
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}
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kctl->id = *dst_id;
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kctl->id.numid = card->last_numid + 1;
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card->last_numid += kctl->count;
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up_write(&card->controls_rwsem);
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return 0;
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}
|
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|
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/**
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* snd_ctl_find_numid - find the control instance with the given number-id
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* @card: the card instance
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* @numid: the number-id to search
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*
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* Finds the control instance with the given number-id from the card.
|
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*
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* Returns the pointer of the instance if found, or NULL if not.
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*
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* The caller must down card->controls_rwsem before calling this function
|
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* (if the race condition can happen).
|
|
*/
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struct snd_kcontrol *snd_ctl_find_numid(struct snd_card *card, unsigned int numid)
|
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{
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struct list_head *list;
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struct snd_kcontrol *kctl;
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|
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snd_assert(card != NULL && numid != 0, return NULL);
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|
list_for_each(list, &card->controls) {
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kctl = snd_kcontrol(list);
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if (kctl->id.numid <= numid && kctl->id.numid + kctl->count > numid)
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return kctl;
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}
|
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return NULL;
|
|
}
|
|
|
|
/**
|
|
* snd_ctl_find_id - find the control instance with the given id
|
|
* @card: the card instance
|
|
* @id: the id to search
|
|
*
|
|
* Finds the control instance with the given id from the card.
|
|
*
|
|
* Returns the pointer of the instance if found, or NULL if not.
|
|
*
|
|
* The caller must down card->controls_rwsem before calling this function
|
|
* (if the race condition can happen).
|
|
*/
|
|
struct snd_kcontrol *snd_ctl_find_id(struct snd_card *card,
|
|
struct snd_ctl_elem_id *id)
|
|
{
|
|
struct list_head *list;
|
|
struct snd_kcontrol *kctl;
|
|
|
|
snd_assert(card != NULL && id != NULL, return NULL);
|
|
if (id->numid != 0)
|
|
return snd_ctl_find_numid(card, id->numid);
|
|
list_for_each(list, &card->controls) {
|
|
kctl = snd_kcontrol(list);
|
|
if (kctl->id.iface != id->iface)
|
|
continue;
|
|
if (kctl->id.device != id->device)
|
|
continue;
|
|
if (kctl->id.subdevice != id->subdevice)
|
|
continue;
|
|
if (strncmp(kctl->id.name, id->name, sizeof(kctl->id.name)))
|
|
continue;
|
|
if (kctl->id.index > id->index)
|
|
continue;
|
|
if (kctl->id.index + kctl->count <= id->index)
|
|
continue;
|
|
return kctl;
|
|
}
|
|
return NULL;
|
|
}
|
|
|
|
static int snd_ctl_card_info(struct snd_card *card, struct snd_ctl_file * ctl,
|
|
unsigned int cmd, void __user *arg)
|
|
{
|
|
struct snd_ctl_card_info *info;
|
|
|
|
info = kzalloc(sizeof(*info), GFP_KERNEL);
|
|
if (! info)
|
|
return -ENOMEM;
|
|
down_read(&snd_ioctl_rwsem);
|
|
info->card = card->number;
|
|
strlcpy(info->id, card->id, sizeof(info->id));
|
|
strlcpy(info->driver, card->driver, sizeof(info->driver));
|
|
strlcpy(info->name, card->shortname, sizeof(info->name));
|
|
strlcpy(info->longname, card->longname, sizeof(info->longname));
|
|
strlcpy(info->mixername, card->mixername, sizeof(info->mixername));
|
|
strlcpy(info->components, card->components, sizeof(info->components));
|
|
up_read(&snd_ioctl_rwsem);
|
|
if (copy_to_user(arg, info, sizeof(struct snd_ctl_card_info))) {
|
|
kfree(info);
|
|
return -EFAULT;
|
|
}
|
|
kfree(info);
|
|
return 0;
|
|
}
|
|
|
|
static int snd_ctl_elem_list(struct snd_card *card,
|
|
struct snd_ctl_elem_list __user *_list)
|
|
{
|
|
struct list_head *plist;
|
|
struct snd_ctl_elem_list list;
|
|
struct snd_kcontrol *kctl;
|
|
struct snd_ctl_elem_id *dst, *id;
|
|
unsigned int offset, space, first, jidx;
|
|
|
|
if (copy_from_user(&list, _list, sizeof(list)))
|
|
return -EFAULT;
|
|
offset = list.offset;
|
|
space = list.space;
|
|
first = 0;
|
|
/* try limit maximum space */
|
|
if (space > 16384)
|
|
return -ENOMEM;
|
|
if (space > 0) {
|
|
/* allocate temporary buffer for atomic operation */
|
|
dst = vmalloc(space * sizeof(struct snd_ctl_elem_id));
|
|
if (dst == NULL)
|
|
return -ENOMEM;
|
|
down_read(&card->controls_rwsem);
|
|
list.count = card->controls_count;
|
|
plist = card->controls.next;
|
|
while (plist != &card->controls) {
|
|
if (offset == 0)
|
|
break;
|
|
kctl = snd_kcontrol(plist);
|
|
if (offset < kctl->count)
|
|
break;
|
|
offset -= kctl->count;
|
|
plist = plist->next;
|
|
}
|
|
list.used = 0;
|
|
id = dst;
|
|
while (space > 0 && plist != &card->controls) {
|
|
kctl = snd_kcontrol(plist);
|
|
for (jidx = offset; space > 0 && jidx < kctl->count; jidx++) {
|
|
snd_ctl_build_ioff(id, kctl, jidx);
|
|
id++;
|
|
space--;
|
|
list.used++;
|
|
}
|
|
plist = plist->next;
|
|
offset = 0;
|
|
}
|
|
up_read(&card->controls_rwsem);
|
|
if (list.used > 0 &&
|
|
copy_to_user(list.pids, dst,
|
|
list.used * sizeof(struct snd_ctl_elem_id))) {
|
|
vfree(dst);
|
|
return -EFAULT;
|
|
}
|
|
vfree(dst);
|
|
} else {
|
|
down_read(&card->controls_rwsem);
|
|
list.count = card->controls_count;
|
|
up_read(&card->controls_rwsem);
|
|
}
|
|
if (copy_to_user(_list, &list, sizeof(list)))
|
|
return -EFAULT;
|
|
return 0;
|
|
}
|
|
|
|
static int snd_ctl_elem_info(struct snd_ctl_file *ctl,
|
|
struct snd_ctl_elem_info *info)
|
|
{
|
|
struct snd_card *card = ctl->card;
|
|
struct snd_kcontrol *kctl;
|
|
struct snd_kcontrol_volatile *vd;
|
|
unsigned int index_offset;
|
|
int result;
|
|
|
|
down_read(&card->controls_rwsem);
|
|
kctl = snd_ctl_find_id(card, &info->id);
|
|
if (kctl == NULL) {
|
|
up_read(&card->controls_rwsem);
|
|
return -ENOENT;
|
|
}
|
|
#ifdef CONFIG_SND_DEBUG
|
|
info->access = 0;
|
|
#endif
|
|
result = kctl->info(kctl, info);
|
|
if (result >= 0) {
|
|
snd_assert(info->access == 0, );
|
|
index_offset = snd_ctl_get_ioff(kctl, &info->id);
|
|
vd = &kctl->vd[index_offset];
|
|
snd_ctl_build_ioff(&info->id, kctl, index_offset);
|
|
info->access = vd->access;
|
|
if (vd->owner) {
|
|
info->access |= SNDRV_CTL_ELEM_ACCESS_LOCK;
|
|
if (vd->owner == ctl)
|
|
info->access |= SNDRV_CTL_ELEM_ACCESS_OWNER;
|
|
info->owner = vd->owner_pid;
|
|
} else {
|
|
info->owner = -1;
|
|
}
|
|
}
|
|
up_read(&card->controls_rwsem);
|
|
return result;
|
|
}
|
|
|
|
static int snd_ctl_elem_info_user(struct snd_ctl_file *ctl,
|
|
struct snd_ctl_elem_info __user *_info)
|
|
{
|
|
struct snd_ctl_elem_info info;
|
|
int result;
|
|
|
|
if (copy_from_user(&info, _info, sizeof(info)))
|
|
return -EFAULT;
|
|
result = snd_ctl_elem_info(ctl, &info);
|
|
if (result >= 0)
|
|
if (copy_to_user(_info, &info, sizeof(info)))
|
|
return -EFAULT;
|
|
return result;
|
|
}
|
|
|
|
int snd_ctl_elem_read(struct snd_card *card, struct snd_ctl_elem_value *control)
|
|
{
|
|
struct snd_kcontrol *kctl;
|
|
struct snd_kcontrol_volatile *vd;
|
|
unsigned int index_offset;
|
|
int result, indirect;
|
|
|
|
down_read(&card->controls_rwsem);
|
|
kctl = snd_ctl_find_id(card, &control->id);
|
|
if (kctl == NULL) {
|
|
result = -ENOENT;
|
|
} else {
|
|
index_offset = snd_ctl_get_ioff(kctl, &control->id);
|
|
vd = &kctl->vd[index_offset];
|
|
indirect = vd->access & SNDRV_CTL_ELEM_ACCESS_INDIRECT ? 1 : 0;
|
|
if (control->indirect != indirect) {
|
|
result = -EACCES;
|
|
} else {
|
|
if ((vd->access & SNDRV_CTL_ELEM_ACCESS_READ) && kctl->get != NULL) {
|
|
snd_ctl_build_ioff(&control->id, kctl, index_offset);
|
|
result = kctl->get(kctl, control);
|
|
} else {
|
|
result = -EPERM;
|
|
}
|
|
}
|
|
}
|
|
up_read(&card->controls_rwsem);
|
|
return result;
|
|
}
|
|
|
|
static int snd_ctl_elem_read_user(struct snd_card *card,
|
|
struct snd_ctl_elem_value __user *_control)
|
|
{
|
|
struct snd_ctl_elem_value *control;
|
|
int result;
|
|
|
|
control = kmalloc(sizeof(*control), GFP_KERNEL);
|
|
if (control == NULL)
|
|
return -ENOMEM;
|
|
if (copy_from_user(control, _control, sizeof(*control))) {
|
|
kfree(control);
|
|
return -EFAULT;
|
|
}
|
|
result = snd_ctl_elem_read(card, control);
|
|
if (result >= 0)
|
|
if (copy_to_user(_control, control, sizeof(*control)))
|
|
result = -EFAULT;
|
|
kfree(control);
|
|
return result;
|
|
}
|
|
|
|
int snd_ctl_elem_write(struct snd_card *card, struct snd_ctl_file *file,
|
|
struct snd_ctl_elem_value *control)
|
|
{
|
|
struct snd_kcontrol *kctl;
|
|
struct snd_kcontrol_volatile *vd;
|
|
unsigned int index_offset;
|
|
int result, indirect;
|
|
|
|
down_read(&card->controls_rwsem);
|
|
kctl = snd_ctl_find_id(card, &control->id);
|
|
if (kctl == NULL) {
|
|
result = -ENOENT;
|
|
} else {
|
|
index_offset = snd_ctl_get_ioff(kctl, &control->id);
|
|
vd = &kctl->vd[index_offset];
|
|
indirect = vd->access & SNDRV_CTL_ELEM_ACCESS_INDIRECT ? 1 : 0;
|
|
if (control->indirect != indirect) {
|
|
result = -EACCES;
|
|
} else {
|
|
if (!(vd->access & SNDRV_CTL_ELEM_ACCESS_WRITE) ||
|
|
kctl->put == NULL ||
|
|
(file && vd->owner != NULL && vd->owner != file)) {
|
|
result = -EPERM;
|
|
} else {
|
|
snd_ctl_build_ioff(&control->id, kctl, index_offset);
|
|
result = kctl->put(kctl, control);
|
|
}
|
|
if (result > 0) {
|
|
up_read(&card->controls_rwsem);
|
|
snd_ctl_notify(card, SNDRV_CTL_EVENT_MASK_VALUE, &control->id);
|
|
return 0;
|
|
}
|
|
}
|
|
}
|
|
up_read(&card->controls_rwsem);
|
|
return result;
|
|
}
|
|
|
|
static int snd_ctl_elem_write_user(struct snd_ctl_file *file,
|
|
struct snd_ctl_elem_value __user *_control)
|
|
{
|
|
struct snd_ctl_elem_value *control;
|
|
int result;
|
|
|
|
control = kmalloc(sizeof(*control), GFP_KERNEL);
|
|
if (control == NULL)
|
|
return -ENOMEM;
|
|
if (copy_from_user(control, _control, sizeof(*control))) {
|
|
kfree(control);
|
|
return -EFAULT;
|
|
}
|
|
result = snd_ctl_elem_write(file->card, file, control);
|
|
if (result >= 0)
|
|
if (copy_to_user(_control, control, sizeof(*control)))
|
|
result = -EFAULT;
|
|
kfree(control);
|
|
return result;
|
|
}
|
|
|
|
static int snd_ctl_elem_lock(struct snd_ctl_file *file,
|
|
struct snd_ctl_elem_id __user *_id)
|
|
{
|
|
struct snd_card *card = file->card;
|
|
struct snd_ctl_elem_id id;
|
|
struct snd_kcontrol *kctl;
|
|
struct snd_kcontrol_volatile *vd;
|
|
int result;
|
|
|
|
if (copy_from_user(&id, _id, sizeof(id)))
|
|
return -EFAULT;
|
|
down_write(&card->controls_rwsem);
|
|
kctl = snd_ctl_find_id(card, &id);
|
|
if (kctl == NULL) {
|
|
result = -ENOENT;
|
|
} else {
|
|
vd = &kctl->vd[snd_ctl_get_ioff(kctl, &id)];
|
|
if (vd->owner != NULL)
|
|
result = -EBUSY;
|
|
else {
|
|
vd->owner = file;
|
|
vd->owner_pid = current->pid;
|
|
result = 0;
|
|
}
|
|
}
|
|
up_write(&card->controls_rwsem);
|
|
return result;
|
|
}
|
|
|
|
static int snd_ctl_elem_unlock(struct snd_ctl_file *file,
|
|
struct snd_ctl_elem_id __user *_id)
|
|
{
|
|
struct snd_card *card = file->card;
|
|
struct snd_ctl_elem_id id;
|
|
struct snd_kcontrol *kctl;
|
|
struct snd_kcontrol_volatile *vd;
|
|
int result;
|
|
|
|
if (copy_from_user(&id, _id, sizeof(id)))
|
|
return -EFAULT;
|
|
down_write(&card->controls_rwsem);
|
|
kctl = snd_ctl_find_id(card, &id);
|
|
if (kctl == NULL) {
|
|
result = -ENOENT;
|
|
} else {
|
|
vd = &kctl->vd[snd_ctl_get_ioff(kctl, &id)];
|
|
if (vd->owner == NULL)
|
|
result = -EINVAL;
|
|
else if (vd->owner != file)
|
|
result = -EPERM;
|
|
else {
|
|
vd->owner = NULL;
|
|
vd->owner_pid = 0;
|
|
result = 0;
|
|
}
|
|
}
|
|
up_write(&card->controls_rwsem);
|
|
return result;
|
|
}
|
|
|
|
struct user_element {
|
|
struct snd_ctl_elem_info info;
|
|
void *elem_data; /* element data */
|
|
unsigned long elem_data_size; /* size of element data in bytes */
|
|
void *priv_data; /* private data (like strings for enumerated type) */
|
|
unsigned long priv_data_size; /* size of private data in bytes */
|
|
};
|
|
|
|
static int snd_ctl_elem_user_info(struct snd_kcontrol *kcontrol,
|
|
struct snd_ctl_elem_info *uinfo)
|
|
{
|
|
struct user_element *ue = kcontrol->private_data;
|
|
|
|
*uinfo = ue->info;
|
|
return 0;
|
|
}
|
|
|
|
static int snd_ctl_elem_user_get(struct snd_kcontrol *kcontrol,
|
|
struct snd_ctl_elem_value *ucontrol)
|
|
{
|
|
struct user_element *ue = kcontrol->private_data;
|
|
|
|
memcpy(&ucontrol->value, ue->elem_data, ue->elem_data_size);
|
|
return 0;
|
|
}
|
|
|
|
static int snd_ctl_elem_user_put(struct snd_kcontrol *kcontrol,
|
|
struct snd_ctl_elem_value *ucontrol)
|
|
{
|
|
int change;
|
|
struct user_element *ue = kcontrol->private_data;
|
|
|
|
change = memcmp(&ucontrol->value, ue->elem_data, ue->elem_data_size) != 0;
|
|
if (change)
|
|
memcpy(ue->elem_data, &ucontrol->value, ue->elem_data_size);
|
|
return change;
|
|
}
|
|
|
|
static void snd_ctl_elem_user_free(struct snd_kcontrol *kcontrol)
|
|
{
|
|
kfree(kcontrol->private_data);
|
|
}
|
|
|
|
static int snd_ctl_elem_add(struct snd_ctl_file *file,
|
|
struct snd_ctl_elem_info *info, int replace)
|
|
{
|
|
struct snd_card *card = file->card;
|
|
struct snd_kcontrol kctl, *_kctl;
|
|
unsigned int access;
|
|
long private_size;
|
|
struct user_element *ue;
|
|
int idx, err;
|
|
|
|
if (card->user_ctl_count >= MAX_USER_CONTROLS)
|
|
return -ENOMEM;
|
|
if (info->count > 1024)
|
|
return -EINVAL;
|
|
access = info->access == 0 ? SNDRV_CTL_ELEM_ACCESS_READWRITE :
|
|
(info->access & (SNDRV_CTL_ELEM_ACCESS_READWRITE|
|
|
SNDRV_CTL_ELEM_ACCESS_INACTIVE));
|
|
info->id.numid = 0;
|
|
memset(&kctl, 0, sizeof(kctl));
|
|
down_write(&card->controls_rwsem);
|
|
_kctl = snd_ctl_find_id(card, &info->id);
|
|
err = 0;
|
|
if (_kctl) {
|
|
if (replace)
|
|
err = snd_ctl_remove(card, _kctl);
|
|
else
|
|
err = -EBUSY;
|
|
} else {
|
|
if (replace)
|
|
err = -ENOENT;
|
|
}
|
|
up_write(&card->controls_rwsem);
|
|
if (err < 0)
|
|
return err;
|
|
memcpy(&kctl.id, &info->id, sizeof(info->id));
|
|
kctl.count = info->owner ? info->owner : 1;
|
|
access |= SNDRV_CTL_ELEM_ACCESS_USER;
|
|
kctl.info = snd_ctl_elem_user_info;
|
|
if (access & SNDRV_CTL_ELEM_ACCESS_READ)
|
|
kctl.get = snd_ctl_elem_user_get;
|
|
if (access & SNDRV_CTL_ELEM_ACCESS_WRITE)
|
|
kctl.put = snd_ctl_elem_user_put;
|
|
switch (info->type) {
|
|
case SNDRV_CTL_ELEM_TYPE_BOOLEAN:
|
|
private_size = sizeof(char);
|
|
if (info->count > 128)
|
|
return -EINVAL;
|
|
break;
|
|
case SNDRV_CTL_ELEM_TYPE_INTEGER:
|
|
private_size = sizeof(long);
|
|
if (info->count > 128)
|
|
return -EINVAL;
|
|
break;
|
|
case SNDRV_CTL_ELEM_TYPE_INTEGER64:
|
|
private_size = sizeof(long long);
|
|
if (info->count > 64)
|
|
return -EINVAL;
|
|
break;
|
|
case SNDRV_CTL_ELEM_TYPE_BYTES:
|
|
private_size = sizeof(unsigned char);
|
|
if (info->count > 512)
|
|
return -EINVAL;
|
|
break;
|
|
case SNDRV_CTL_ELEM_TYPE_IEC958:
|
|
private_size = sizeof(struct snd_aes_iec958);
|
|
if (info->count != 1)
|
|
return -EINVAL;
|
|
break;
|
|
default:
|
|
return -EINVAL;
|
|
}
|
|
private_size *= info->count;
|
|
ue = kzalloc(sizeof(struct user_element) + private_size, GFP_KERNEL);
|
|
if (ue == NULL)
|
|
return -ENOMEM;
|
|
ue->info = *info;
|
|
ue->elem_data = (char *)ue + sizeof(*ue);
|
|
ue->elem_data_size = private_size;
|
|
kctl.private_free = snd_ctl_elem_user_free;
|
|
_kctl = snd_ctl_new(&kctl, access);
|
|
if (_kctl == NULL) {
|
|
kfree(_kctl->private_data);
|
|
return -ENOMEM;
|
|
}
|
|
_kctl->private_data = ue;
|
|
for (idx = 0; idx < _kctl->count; idx++)
|
|
_kctl->vd[idx].owner = file;
|
|
err = snd_ctl_add(card, _kctl);
|
|
if (err < 0) {
|
|
snd_ctl_free_one(_kctl);
|
|
return err;
|
|
}
|
|
|
|
down_write(&card->controls_rwsem);
|
|
card->user_ctl_count++;
|
|
up_write(&card->controls_rwsem);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int snd_ctl_elem_add_user(struct snd_ctl_file *file,
|
|
struct snd_ctl_elem_info __user *_info, int replace)
|
|
{
|
|
struct snd_ctl_elem_info info;
|
|
if (copy_from_user(&info, _info, sizeof(info)))
|
|
return -EFAULT;
|
|
return snd_ctl_elem_add(file, &info, replace);
|
|
}
|
|
|
|
static int snd_ctl_elem_remove(struct snd_ctl_file *file,
|
|
struct snd_ctl_elem_id __user *_id)
|
|
{
|
|
struct snd_ctl_elem_id id;
|
|
int err;
|
|
|
|
if (copy_from_user(&id, _id, sizeof(id)))
|
|
return -EFAULT;
|
|
err = snd_ctl_remove_unlocked_id(file, &id);
|
|
if (! err) {
|
|
struct snd_card *card = file->card;
|
|
down_write(&card->controls_rwsem);
|
|
card->user_ctl_count--;
|
|
up_write(&card->controls_rwsem);
|
|
}
|
|
return err;
|
|
}
|
|
|
|
static int snd_ctl_subscribe_events(struct snd_ctl_file *file, int __user *ptr)
|
|
{
|
|
int subscribe;
|
|
if (get_user(subscribe, ptr))
|
|
return -EFAULT;
|
|
if (subscribe < 0) {
|
|
subscribe = file->subscribed;
|
|
if (put_user(subscribe, ptr))
|
|
return -EFAULT;
|
|
return 0;
|
|
}
|
|
if (subscribe) {
|
|
file->subscribed = 1;
|
|
return 0;
|
|
} else if (file->subscribed) {
|
|
snd_ctl_empty_read_queue(file);
|
|
file->subscribed = 0;
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
static long snd_ctl_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
|
|
{
|
|
struct snd_ctl_file *ctl;
|
|
struct snd_card *card;
|
|
struct list_head *list;
|
|
struct snd_kctl_ioctl *p;
|
|
void __user *argp = (void __user *)arg;
|
|
int __user *ip = argp;
|
|
int err;
|
|
|
|
ctl = file->private_data;
|
|
card = ctl->card;
|
|
snd_assert(card != NULL, return -ENXIO);
|
|
switch (cmd) {
|
|
case SNDRV_CTL_IOCTL_PVERSION:
|
|
return put_user(SNDRV_CTL_VERSION, ip) ? -EFAULT : 0;
|
|
case SNDRV_CTL_IOCTL_CARD_INFO:
|
|
return snd_ctl_card_info(card, ctl, cmd, argp);
|
|
case SNDRV_CTL_IOCTL_ELEM_LIST:
|
|
return snd_ctl_elem_list(ctl->card, argp);
|
|
case SNDRV_CTL_IOCTL_ELEM_INFO:
|
|
return snd_ctl_elem_info_user(ctl, argp);
|
|
case SNDRV_CTL_IOCTL_ELEM_READ:
|
|
return snd_ctl_elem_read_user(ctl->card, argp);
|
|
case SNDRV_CTL_IOCTL_ELEM_WRITE:
|
|
return snd_ctl_elem_write_user(ctl, argp);
|
|
case SNDRV_CTL_IOCTL_ELEM_LOCK:
|
|
return snd_ctl_elem_lock(ctl, argp);
|
|
case SNDRV_CTL_IOCTL_ELEM_UNLOCK:
|
|
return snd_ctl_elem_unlock(ctl, argp);
|
|
case SNDRV_CTL_IOCTL_ELEM_ADD:
|
|
return snd_ctl_elem_add_user(ctl, argp, 0);
|
|
case SNDRV_CTL_IOCTL_ELEM_REPLACE:
|
|
return snd_ctl_elem_add_user(ctl, argp, 1);
|
|
case SNDRV_CTL_IOCTL_ELEM_REMOVE:
|
|
return snd_ctl_elem_remove(ctl, argp);
|
|
case SNDRV_CTL_IOCTL_SUBSCRIBE_EVENTS:
|
|
return snd_ctl_subscribe_events(ctl, ip);
|
|
case SNDRV_CTL_IOCTL_POWER:
|
|
return -ENOPROTOOPT;
|
|
case SNDRV_CTL_IOCTL_POWER_STATE:
|
|
#ifdef CONFIG_PM
|
|
return put_user(card->power_state, ip) ? -EFAULT : 0;
|
|
#else
|
|
return put_user(SNDRV_CTL_POWER_D0, ip) ? -EFAULT : 0;
|
|
#endif
|
|
}
|
|
down_read(&snd_ioctl_rwsem);
|
|
list_for_each(list, &snd_control_ioctls) {
|
|
p = list_entry(list, struct snd_kctl_ioctl, list);
|
|
err = p->fioctl(card, ctl, cmd, arg);
|
|
if (err != -ENOIOCTLCMD) {
|
|
up_read(&snd_ioctl_rwsem);
|
|
return err;
|
|
}
|
|
}
|
|
up_read(&snd_ioctl_rwsem);
|
|
snd_printdd("unknown ioctl = 0x%x\n", cmd);
|
|
return -ENOTTY;
|
|
}
|
|
|
|
static ssize_t snd_ctl_read(struct file *file, char __user *buffer,
|
|
size_t count, loff_t * offset)
|
|
{
|
|
struct snd_ctl_file *ctl;
|
|
int err = 0;
|
|
ssize_t result = 0;
|
|
|
|
ctl = file->private_data;
|
|
snd_assert(ctl != NULL && ctl->card != NULL, return -ENXIO);
|
|
if (!ctl->subscribed)
|
|
return -EBADFD;
|
|
if (count < sizeof(struct snd_ctl_event))
|
|
return -EINVAL;
|
|
spin_lock_irq(&ctl->read_lock);
|
|
while (count >= sizeof(struct snd_ctl_event)) {
|
|
struct snd_ctl_event ev;
|
|
struct snd_kctl_event *kev;
|
|
while (list_empty(&ctl->events)) {
|
|
wait_queue_t wait;
|
|
if ((file->f_flags & O_NONBLOCK) != 0 || result > 0) {
|
|
err = -EAGAIN;
|
|
goto __end_lock;
|
|
}
|
|
init_waitqueue_entry(&wait, current);
|
|
add_wait_queue(&ctl->change_sleep, &wait);
|
|
set_current_state(TASK_INTERRUPTIBLE);
|
|
spin_unlock_irq(&ctl->read_lock);
|
|
schedule();
|
|
remove_wait_queue(&ctl->change_sleep, &wait);
|
|
if (signal_pending(current))
|
|
return result > 0 ? result : -ERESTARTSYS;
|
|
spin_lock_irq(&ctl->read_lock);
|
|
}
|
|
kev = snd_kctl_event(ctl->events.next);
|
|
ev.type = SNDRV_CTL_EVENT_ELEM;
|
|
ev.data.elem.mask = kev->mask;
|
|
ev.data.elem.id = kev->id;
|
|
list_del(&kev->list);
|
|
spin_unlock_irq(&ctl->read_lock);
|
|
kfree(kev);
|
|
if (copy_to_user(buffer, &ev, sizeof(struct snd_ctl_event))) {
|
|
err = -EFAULT;
|
|
goto __end;
|
|
}
|
|
spin_lock_irq(&ctl->read_lock);
|
|
buffer += sizeof(struct snd_ctl_event);
|
|
count -= sizeof(struct snd_ctl_event);
|
|
result += sizeof(struct snd_ctl_event);
|
|
}
|
|
__end_lock:
|
|
spin_unlock_irq(&ctl->read_lock);
|
|
__end:
|
|
return result > 0 ? result : err;
|
|
}
|
|
|
|
static unsigned int snd_ctl_poll(struct file *file, poll_table * wait)
|
|
{
|
|
unsigned int mask;
|
|
struct snd_ctl_file *ctl;
|
|
|
|
ctl = file->private_data;
|
|
if (!ctl->subscribed)
|
|
return 0;
|
|
poll_wait(file, &ctl->change_sleep, wait);
|
|
|
|
mask = 0;
|
|
if (!list_empty(&ctl->events))
|
|
mask |= POLLIN | POLLRDNORM;
|
|
|
|
return mask;
|
|
}
|
|
|
|
/*
|
|
* register the device-specific control-ioctls.
|
|
* called from each device manager like pcm.c, hwdep.c, etc.
|
|
*/
|
|
static int _snd_ctl_register_ioctl(snd_kctl_ioctl_func_t fcn, struct list_head *lists)
|
|
{
|
|
struct snd_kctl_ioctl *pn;
|
|
|
|
pn = kzalloc(sizeof(struct snd_kctl_ioctl), GFP_KERNEL);
|
|
if (pn == NULL)
|
|
return -ENOMEM;
|
|
pn->fioctl = fcn;
|
|
down_write(&snd_ioctl_rwsem);
|
|
list_add_tail(&pn->list, lists);
|
|
up_write(&snd_ioctl_rwsem);
|
|
return 0;
|
|
}
|
|
|
|
int snd_ctl_register_ioctl(snd_kctl_ioctl_func_t fcn)
|
|
{
|
|
return _snd_ctl_register_ioctl(fcn, &snd_control_ioctls);
|
|
}
|
|
|
|
#ifdef CONFIG_COMPAT
|
|
int snd_ctl_register_ioctl_compat(snd_kctl_ioctl_func_t fcn)
|
|
{
|
|
return _snd_ctl_register_ioctl(fcn, &snd_control_compat_ioctls);
|
|
}
|
|
#endif
|
|
|
|
/*
|
|
* de-register the device-specific control-ioctls.
|
|
*/
|
|
static int _snd_ctl_unregister_ioctl(snd_kctl_ioctl_func_t fcn,
|
|
struct list_head *lists)
|
|
{
|
|
struct list_head *list;
|
|
struct snd_kctl_ioctl *p;
|
|
|
|
snd_assert(fcn != NULL, return -EINVAL);
|
|
down_write(&snd_ioctl_rwsem);
|
|
list_for_each(list, lists) {
|
|
p = list_entry(list, struct snd_kctl_ioctl, list);
|
|
if (p->fioctl == fcn) {
|
|
list_del(&p->list);
|
|
up_write(&snd_ioctl_rwsem);
|
|
kfree(p);
|
|
return 0;
|
|
}
|
|
}
|
|
up_write(&snd_ioctl_rwsem);
|
|
snd_BUG();
|
|
return -EINVAL;
|
|
}
|
|
|
|
int snd_ctl_unregister_ioctl(snd_kctl_ioctl_func_t fcn)
|
|
{
|
|
return _snd_ctl_unregister_ioctl(fcn, &snd_control_ioctls);
|
|
}
|
|
|
|
#ifdef CONFIG_COMPAT
|
|
int snd_ctl_unregister_ioctl_compat(snd_kctl_ioctl_func_t fcn)
|
|
{
|
|
return _snd_ctl_unregister_ioctl(fcn, &snd_control_compat_ioctls);
|
|
}
|
|
|
|
#endif
|
|
|
|
static int snd_ctl_fasync(int fd, struct file * file, int on)
|
|
{
|
|
struct snd_ctl_file *ctl;
|
|
int err;
|
|
ctl = file->private_data;
|
|
err = fasync_helper(fd, file, on, &ctl->fasync);
|
|
if (err < 0)
|
|
return err;
|
|
return 0;
|
|
}
|
|
|
|
/*
|
|
* ioctl32 compat
|
|
*/
|
|
#ifdef CONFIG_COMPAT
|
|
#include "control_compat.c"
|
|
#else
|
|
#define snd_ctl_ioctl_compat NULL
|
|
#endif
|
|
|
|
/*
|
|
* INIT PART
|
|
*/
|
|
|
|
static struct file_operations snd_ctl_f_ops =
|
|
{
|
|
.owner = THIS_MODULE,
|
|
.read = snd_ctl_read,
|
|
.open = snd_ctl_open,
|
|
.release = snd_ctl_release,
|
|
.poll = snd_ctl_poll,
|
|
.unlocked_ioctl = snd_ctl_ioctl,
|
|
.compat_ioctl = snd_ctl_ioctl_compat,
|
|
.fasync = snd_ctl_fasync,
|
|
};
|
|
|
|
/*
|
|
* registration of the control device
|
|
*/
|
|
static int snd_ctl_dev_register(struct snd_device *device)
|
|
{
|
|
struct snd_card *card = device->device_data;
|
|
int err, cardnum;
|
|
char name[16];
|
|
|
|
snd_assert(card != NULL, return -ENXIO);
|
|
cardnum = card->number;
|
|
snd_assert(cardnum >= 0 && cardnum < SNDRV_CARDS, return -ENXIO);
|
|
sprintf(name, "controlC%i", cardnum);
|
|
if ((err = snd_register_device(SNDRV_DEVICE_TYPE_CONTROL,
|
|
card, -1, &snd_ctl_f_ops, name)) < 0)
|
|
return err;
|
|
return 0;
|
|
}
|
|
|
|
/*
|
|
* disconnection of the control device
|
|
*/
|
|
static int snd_ctl_dev_disconnect(struct snd_device *device)
|
|
{
|
|
struct snd_card *card = device->device_data;
|
|
struct list_head *flist;
|
|
struct snd_ctl_file *ctl;
|
|
|
|
down_read(&card->controls_rwsem);
|
|
list_for_each(flist, &card->ctl_files) {
|
|
ctl = snd_ctl_file(flist);
|
|
wake_up(&ctl->change_sleep);
|
|
kill_fasync(&ctl->fasync, SIGIO, POLL_ERR);
|
|
}
|
|
up_read(&card->controls_rwsem);
|
|
return 0;
|
|
}
|
|
|
|
/*
|
|
* free all controls
|
|
*/
|
|
static int snd_ctl_dev_free(struct snd_device *device)
|
|
{
|
|
struct snd_card *card = device->device_data;
|
|
struct snd_kcontrol *control;
|
|
|
|
down_write(&card->controls_rwsem);
|
|
while (!list_empty(&card->controls)) {
|
|
control = snd_kcontrol(card->controls.next);
|
|
snd_ctl_remove(card, control);
|
|
}
|
|
up_write(&card->controls_rwsem);
|
|
return 0;
|
|
}
|
|
|
|
/*
|
|
* de-registration of the control device
|
|
*/
|
|
static int snd_ctl_dev_unregister(struct snd_device *device)
|
|
{
|
|
struct snd_card *card = device->device_data;
|
|
int err, cardnum;
|
|
|
|
snd_assert(card != NULL, return -ENXIO);
|
|
cardnum = card->number;
|
|
snd_assert(cardnum >= 0 && cardnum < SNDRV_CARDS, return -ENXIO);
|
|
if ((err = snd_unregister_device(SNDRV_DEVICE_TYPE_CONTROL,
|
|
card, -1)) < 0)
|
|
return err;
|
|
return snd_ctl_dev_free(device);
|
|
}
|
|
|
|
/*
|
|
* create control core:
|
|
* called from init.c
|
|
*/
|
|
int snd_ctl_create(struct snd_card *card)
|
|
{
|
|
static struct snd_device_ops ops = {
|
|
.dev_free = snd_ctl_dev_free,
|
|
.dev_register = snd_ctl_dev_register,
|
|
.dev_disconnect = snd_ctl_dev_disconnect,
|
|
.dev_unregister = snd_ctl_dev_unregister
|
|
};
|
|
|
|
snd_assert(card != NULL, return -ENXIO);
|
|
return snd_device_new(card, SNDRV_DEV_CONTROL, card, &ops);
|
|
}
|