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![Dan Carpenter](/assets/img/avatar_default.png)
Smatch complains that "ret" might be uninitialized.
Fixes: fbd3eb7f66
("ALSA: control: Add verification for kctl accesses")
Signed-off-by: Dan Carpenter <dan.carpenter@oracle.com>
Link: https://lore.kernel.org/r/20200108053706.h3hcnvmnf62wkjac@kili.mountain
Signed-off-by: Takashi Iwai <tiwai@suse.de>
2131 lines
55 KiB
C
2131 lines
55 KiB
C
// SPDX-License-Identifier: GPL-2.0-or-later
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/*
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* Routines for driver control interface
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* Copyright (c) by Jaroslav Kysela <perex@perex.cz>
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*/
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#include <linux/threads.h>
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#include <linux/interrupt.h>
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#include <linux/module.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 <linux/mm.h>
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#include <linux/math64.h>
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#include <linux/sched/signal.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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#define MAX_CONTROL_COUNT 1028
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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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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 i, err;
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err = stream_open(inode, file);
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if (err < 0)
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return err;
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card = snd_lookup_minor_data(iminor(inode), SNDRV_DEVICE_TYPE_CONTROL);
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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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for (i = 0; i < SND_CTL_SUBDEV_ITEMS; i++)
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ctl->preferred_subdevice[i] = -1;
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ctl->pid = get_pid(task_pid(current));
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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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snd_card_unref(card);
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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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if (card)
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snd_card_unref(card);
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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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unsigned long flags;
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struct snd_kctl_event *cread;
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spin_lock_irqsave(&ctl->read_lock, flags);
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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_irqrestore(&ctl->read_lock, flags);
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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 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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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_entry(control, &card->controls, 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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up_write(&card->controls_rwsem);
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snd_ctl_empty_read_queue(ctl);
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put_pid(ctl->pid);
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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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/**
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* snd_ctl_notify - Send notification to user-space for a control change
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* @card: the card to send notification
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* @mask: the event mask, SNDRV_CTL_EVENT_*
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* @id: the ctl element id to send notification
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*
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* This function adds an event record with the given id and mask, appends
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* to the list and wakes up the user-space for notification. This can be
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* called in the atomic context.
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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 snd_ctl_file *ctl;
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struct snd_kctl_event *ev;
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if (snd_BUG_ON(!card || !id))
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return;
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if (card->shutdown)
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return;
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read_lock(&card->ctl_files_rwlock);
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#if IS_ENABLED(CONFIG_SND_MIXER_OSS)
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card->mixer_oss_change_count++;
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#endif
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list_for_each_entry(ctl, &card->ctl_files, list) {
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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_entry(ev, &ctl->events, list) {
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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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dev_err(card->dev, "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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EXPORT_SYMBOL(snd_ctl_notify);
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/**
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* snd_ctl_new - create a new control instance with some elements
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* @kctl: the pointer to store new control instance
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* @count: the number of elements in this control
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* @access: the default access flags for elements in this control
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* @file: given when locking these elements
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*
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* Allocates a memory object for a new control instance. The instance has
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* elements as many as the given number (@count). Each element has given
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* access permissions (@access). Each element is locked when @file is given.
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*
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* Return: 0 on success, error code on failure
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*/
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static int snd_ctl_new(struct snd_kcontrol **kctl, unsigned int count,
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unsigned int access, struct snd_ctl_file *file)
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{
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unsigned int idx;
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if (count == 0 || count > MAX_CONTROL_COUNT)
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return -EINVAL;
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*kctl = kzalloc(struct_size(*kctl, vd, count), GFP_KERNEL);
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if (!*kctl)
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return -ENOMEM;
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for (idx = 0; idx < count; idx++) {
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(*kctl)->vd[idx].access = access;
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(*kctl)->vd[idx].owner = file;
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}
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(*kctl)->count = count;
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return 0;
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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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* Return: 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 count;
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unsigned int access;
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int err;
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if (snd_BUG_ON(!ncontrol || !ncontrol->info))
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return NULL;
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count = ncontrol->count;
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if (count == 0)
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count = 1;
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access = ncontrol->access;
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if (access == 0)
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access = SNDRV_CTL_ELEM_ACCESS_READWRITE;
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access &= (SNDRV_CTL_ELEM_ACCESS_READWRITE |
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SNDRV_CTL_ELEM_ACCESS_VOLATILE |
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SNDRV_CTL_ELEM_ACCESS_INACTIVE |
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SNDRV_CTL_ELEM_ACCESS_TLV_READWRITE |
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SNDRV_CTL_ELEM_ACCESS_TLV_COMMAND |
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SNDRV_CTL_ELEM_ACCESS_TLV_CALLBACK |
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SNDRV_CTL_ELEM_ACCESS_SKIP_CHECK);
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err = snd_ctl_new(&kctl, count, access, NULL);
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if (err < 0)
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return NULL;
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/* The 'numid' member is decided when calling snd_ctl_add(). */
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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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if (strcmp(ncontrol->name, kctl->id.name) != 0)
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pr_warn("ALSA: Control name '%s' truncated to '%s'\n",
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ncontrol->name, kctl->id.name);
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}
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kctl->id.index = ncontrol->index;
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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->tlv.p = ncontrol->tlv.p;
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kctl->private_value = ncontrol->private_value;
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kctl->private_data = private_data;
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return kctl;
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}
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EXPORT_SYMBOL(snd_ctl_new1);
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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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EXPORT_SYMBOL(snd_ctl_free_one);
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static bool snd_ctl_remove_numid_conflict(struct snd_card *card,
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unsigned int count)
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{
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struct snd_kcontrol *kctl;
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/* Make sure that the ids assigned to the control do not wrap around */
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if (card->last_numid >= UINT_MAX - count)
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card->last_numid = 0;
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list_for_each_entry(kctl, &card->controls, list) {
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if (kctl->id.numid < card->last_numid + 1 + count &&
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kctl->id.numid + kctl->count > card->last_numid + 1) {
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card->last_numid = kctl->id.numid + kctl->count - 1;
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return true;
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}
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}
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return false;
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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 iter = 100000;
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while (snd_ctl_remove_numid_conflict(card, count)) {
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if (--iter == 0) {
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/* this situation is very unlikely */
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dev_err(card->dev, "unable to allocate new control numid\n");
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return -ENOMEM;
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}
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}
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return 0;
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}
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enum snd_ctl_add_mode {
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CTL_ADD_EXCLUSIVE, CTL_REPLACE, CTL_ADD_ON_REPLACE,
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};
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/* add/replace a new kcontrol object; call with card->controls_rwsem locked */
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static int __snd_ctl_add_replace(struct snd_card *card,
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struct snd_kcontrol *kcontrol,
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enum snd_ctl_add_mode mode)
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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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unsigned int count;
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struct snd_kcontrol *old;
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int err;
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id = kcontrol->id;
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if (id.index > UINT_MAX - kcontrol->count)
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return -EINVAL;
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old = snd_ctl_find_id(card, &id);
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if (!old) {
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if (mode == CTL_REPLACE)
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return -EINVAL;
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} else {
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if (mode == CTL_ADD_EXCLUSIVE) {
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dev_err(card->dev,
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"control %i:%i:%i:%s:%i is already present\n",
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id.iface, id.device, id.subdevice, id.name,
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id.index);
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return -EBUSY;
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}
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err = snd_ctl_remove(card, old);
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if (err < 0)
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return err;
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}
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if (snd_ctl_find_hole(card, kcontrol->count) < 0)
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return -ENOMEM;
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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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id = kcontrol->id;
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count = kcontrol->count;
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for (idx = 0; idx < 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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static int snd_ctl_add_replace(struct snd_card *card,
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struct snd_kcontrol *kcontrol,
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enum snd_ctl_add_mode mode)
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{
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int err = -EINVAL;
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if (! kcontrol)
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return err;
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if (snd_BUG_ON(!card || !kcontrol->info))
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goto error;
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down_write(&card->controls_rwsem);
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err = __snd_ctl_add_replace(card, kcontrol, mode);
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up_write(&card->controls_rwsem);
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if (err < 0)
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goto error;
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return 0;
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error:
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snd_ctl_free_one(kcontrol);
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return err;
|
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}
|
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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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* It frees automatically the control which cannot be added.
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*
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* Return: Zero if successful, or a negative error code on failure.
|
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*
|
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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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return snd_ctl_add_replace(card, kcontrol, CTL_ADD_EXCLUSIVE);
|
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}
|
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EXPORT_SYMBOL(snd_ctl_add);
|
|
|
|
/**
|
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* snd_ctl_replace - replace the control instance of the card
|
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* @card: the card instance
|
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* @kcontrol: the control instance to replace
|
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* @add_on_replace: add the control if not already added
|
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*
|
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* Replaces the given control. If the given control does not exist
|
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* and the add_on_replace flag is set, the control is added. If the
|
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* control exists, it is destroyed first.
|
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*
|
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* It frees automatically the control which cannot be added or replaced.
|
|
*
|
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* Return: Zero if successful, or a negative error code on failure.
|
|
*/
|
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int snd_ctl_replace(struct snd_card *card, struct snd_kcontrol *kcontrol,
|
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bool add_on_replace)
|
|
{
|
|
return snd_ctl_add_replace(card, kcontrol,
|
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add_on_replace ? CTL_ADD_ON_REPLACE : CTL_REPLACE);
|
|
}
|
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EXPORT_SYMBOL(snd_ctl_replace);
|
|
|
|
/**
|
|
* snd_ctl_remove - remove the control from the card and release it
|
|
* @card: the card instance
|
|
* @kcontrol: the control instance to remove
|
|
*
|
|
* Removes the control from the card and then releases the instance.
|
|
* You don't need to call snd_ctl_free_one(). You must be in
|
|
* the write lock - down_write(&card->controls_rwsem).
|
|
*
|
|
* Return: 0 if successful, or a negative error code on failure.
|
|
*/
|
|
int snd_ctl_remove(struct snd_card *card, struct snd_kcontrol *kcontrol)
|
|
{
|
|
struct snd_ctl_elem_id id;
|
|
unsigned int idx;
|
|
|
|
if (snd_BUG_ON(!card || !kcontrol))
|
|
return -EINVAL;
|
|
list_del(&kcontrol->list);
|
|
card->controls_count -= kcontrol->count;
|
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id = kcontrol->id;
|
|
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);
|
|
return 0;
|
|
}
|
|
EXPORT_SYMBOL(snd_ctl_remove);
|
|
|
|
/**
|
|
* snd_ctl_remove_id - remove the control of the given id and release it
|
|
* @card: the card instance
|
|
* @id: the control id to remove
|
|
*
|
|
* Finds the control instance with the given id, removes it from the
|
|
* card list and releases it.
|
|
*
|
|
* Return: 0 if successful, or a negative error code on failure.
|
|
*/
|
|
int snd_ctl_remove_id(struct snd_card *card, struct snd_ctl_elem_id *id)
|
|
{
|
|
struct snd_kcontrol *kctl;
|
|
int ret;
|
|
|
|
down_write(&card->controls_rwsem);
|
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kctl = snd_ctl_find_id(card, id);
|
|
if (kctl == NULL) {
|
|
up_write(&card->controls_rwsem);
|
|
return -ENOENT;
|
|
}
|
|
ret = snd_ctl_remove(card, kctl);
|
|
up_write(&card->controls_rwsem);
|
|
return ret;
|
|
}
|
|
EXPORT_SYMBOL(snd_ctl_remove_id);
|
|
|
|
/**
|
|
* snd_ctl_remove_user_ctl - remove and release the unlocked user control
|
|
* @file: active control handle
|
|
* @id: the control id to remove
|
|
*
|
|
* Finds the control instance with the given id, removes it from the
|
|
* card list and releases it.
|
|
*
|
|
* Return: 0 if successful, or a negative error code on failure.
|
|
*/
|
|
static int snd_ctl_remove_user_ctl(struct snd_ctl_file * file,
|
|
struct snd_ctl_elem_id *id)
|
|
{
|
|
struct snd_card *card = file->card;
|
|
struct snd_kcontrol *kctl;
|
|
int idx, ret;
|
|
|
|
down_write(&card->controls_rwsem);
|
|
kctl = snd_ctl_find_id(card, id);
|
|
if (kctl == NULL) {
|
|
ret = -ENOENT;
|
|
goto error;
|
|
}
|
|
if (!(kctl->vd[0].access & SNDRV_CTL_ELEM_ACCESS_USER)) {
|
|
ret = -EINVAL;
|
|
goto error;
|
|
}
|
|
for (idx = 0; idx < kctl->count; idx++)
|
|
if (kctl->vd[idx].owner != NULL && kctl->vd[idx].owner != file) {
|
|
ret = -EBUSY;
|
|
goto error;
|
|
}
|
|
ret = snd_ctl_remove(card, kctl);
|
|
if (ret < 0)
|
|
goto error;
|
|
card->user_ctl_count--;
|
|
error:
|
|
up_write(&card->controls_rwsem);
|
|
return ret;
|
|
}
|
|
|
|
/**
|
|
* snd_ctl_activate_id - activate/inactivate the control of the given id
|
|
* @card: the card instance
|
|
* @id: the control id to activate/inactivate
|
|
* @active: non-zero to activate
|
|
*
|
|
* Finds the control instance with the given id, and activate or
|
|
* inactivate the control together with notification, if changed.
|
|
* The given ID data is filled with full information.
|
|
*
|
|
* Return: 0 if unchanged, 1 if changed, or a negative error code on failure.
|
|
*/
|
|
int snd_ctl_activate_id(struct snd_card *card, struct snd_ctl_elem_id *id,
|
|
int active)
|
|
{
|
|
struct snd_kcontrol *kctl;
|
|
struct snd_kcontrol_volatile *vd;
|
|
unsigned int index_offset;
|
|
int ret;
|
|
|
|
down_write(&card->controls_rwsem);
|
|
kctl = snd_ctl_find_id(card, id);
|
|
if (kctl == NULL) {
|
|
ret = -ENOENT;
|
|
goto unlock;
|
|
}
|
|
index_offset = snd_ctl_get_ioff(kctl, id);
|
|
vd = &kctl->vd[index_offset];
|
|
ret = 0;
|
|
if (active) {
|
|
if (!(vd->access & SNDRV_CTL_ELEM_ACCESS_INACTIVE))
|
|
goto unlock;
|
|
vd->access &= ~SNDRV_CTL_ELEM_ACCESS_INACTIVE;
|
|
} else {
|
|
if (vd->access & SNDRV_CTL_ELEM_ACCESS_INACTIVE)
|
|
goto unlock;
|
|
vd->access |= SNDRV_CTL_ELEM_ACCESS_INACTIVE;
|
|
}
|
|
snd_ctl_build_ioff(id, kctl, index_offset);
|
|
ret = 1;
|
|
unlock:
|
|
up_write(&card->controls_rwsem);
|
|
if (ret > 0)
|
|
snd_ctl_notify(card, SNDRV_CTL_EVENT_MASK_INFO, id);
|
|
return ret;
|
|
}
|
|
EXPORT_SYMBOL_GPL(snd_ctl_activate_id);
|
|
|
|
/**
|
|
* snd_ctl_rename_id - replace the id of a control on the card
|
|
* @card: the card instance
|
|
* @src_id: the old id
|
|
* @dst_id: the new id
|
|
*
|
|
* Finds the control with the old id from the card, and replaces the
|
|
* id with the new one.
|
|
*
|
|
* Return: Zero if successful, or a negative error code on failure.
|
|
*/
|
|
int snd_ctl_rename_id(struct snd_card *card, struct snd_ctl_elem_id *src_id,
|
|
struct snd_ctl_elem_id *dst_id)
|
|
{
|
|
struct snd_kcontrol *kctl;
|
|
|
|
down_write(&card->controls_rwsem);
|
|
kctl = snd_ctl_find_id(card, src_id);
|
|
if (kctl == NULL) {
|
|
up_write(&card->controls_rwsem);
|
|
return -ENOENT;
|
|
}
|
|
kctl->id = *dst_id;
|
|
kctl->id.numid = card->last_numid + 1;
|
|
card->last_numid += kctl->count;
|
|
up_write(&card->controls_rwsem);
|
|
return 0;
|
|
}
|
|
EXPORT_SYMBOL(snd_ctl_rename_id);
|
|
|
|
/**
|
|
* snd_ctl_find_numid - find the control instance with the given number-id
|
|
* @card: the card instance
|
|
* @numid: the number-id to search
|
|
*
|
|
* Finds the control instance with the given number-id from the card.
|
|
*
|
|
* The caller must down card->controls_rwsem before calling this function
|
|
* (if the race condition can happen).
|
|
*
|
|
* Return: The pointer of the instance if found, or %NULL if not.
|
|
*
|
|
*/
|
|
struct snd_kcontrol *snd_ctl_find_numid(struct snd_card *card, unsigned int numid)
|
|
{
|
|
struct snd_kcontrol *kctl;
|
|
|
|
if (snd_BUG_ON(!card || !numid))
|
|
return NULL;
|
|
list_for_each_entry(kctl, &card->controls, list) {
|
|
if (kctl->id.numid <= numid && kctl->id.numid + kctl->count > numid)
|
|
return kctl;
|
|
}
|
|
return NULL;
|
|
}
|
|
EXPORT_SYMBOL(snd_ctl_find_numid);
|
|
|
|
/**
|
|
* 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.
|
|
*
|
|
* The caller must down card->controls_rwsem before calling this function
|
|
* (if the race condition can happen).
|
|
*
|
|
* Return: The pointer of the instance if found, or %NULL if not.
|
|
*
|
|
*/
|
|
struct snd_kcontrol *snd_ctl_find_id(struct snd_card *card,
|
|
struct snd_ctl_elem_id *id)
|
|
{
|
|
struct snd_kcontrol *kctl;
|
|
|
|
if (snd_BUG_ON(!card || !id))
|
|
return NULL;
|
|
if (id->numid != 0)
|
|
return snd_ctl_find_numid(card, id->numid);
|
|
list_for_each_entry(kctl, &card->controls, 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;
|
|
}
|
|
EXPORT_SYMBOL(snd_ctl_find_id);
|
|
|
|
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 snd_ctl_elem_list list;
|
|
struct snd_kcontrol *kctl;
|
|
struct snd_ctl_elem_id id;
|
|
unsigned int offset, space, jidx;
|
|
int err = 0;
|
|
|
|
if (copy_from_user(&list, _list, sizeof(list)))
|
|
return -EFAULT;
|
|
offset = list.offset;
|
|
space = list.space;
|
|
|
|
down_read(&card->controls_rwsem);
|
|
list.count = card->controls_count;
|
|
list.used = 0;
|
|
if (space > 0) {
|
|
list_for_each_entry(kctl, &card->controls, list) {
|
|
if (offset >= kctl->count) {
|
|
offset -= kctl->count;
|
|
continue;
|
|
}
|
|
for (jidx = offset; jidx < kctl->count; jidx++) {
|
|
snd_ctl_build_ioff(&id, kctl, jidx);
|
|
if (copy_to_user(list.pids + list.used, &id,
|
|
sizeof(id))) {
|
|
err = -EFAULT;
|
|
goto out;
|
|
}
|
|
list.used++;
|
|
if (!--space)
|
|
goto out;
|
|
}
|
|
offset = 0;
|
|
}
|
|
}
|
|
out:
|
|
up_read(&card->controls_rwsem);
|
|
if (!err && copy_to_user(_list, &list, sizeof(list)))
|
|
err = -EFAULT;
|
|
return err;
|
|
}
|
|
|
|
/* Check whether the given kctl info is valid */
|
|
static int snd_ctl_check_elem_info(struct snd_card *card,
|
|
const struct snd_ctl_elem_info *info)
|
|
{
|
|
static const unsigned int max_value_counts[] = {
|
|
[SNDRV_CTL_ELEM_TYPE_BOOLEAN] = 128,
|
|
[SNDRV_CTL_ELEM_TYPE_INTEGER] = 128,
|
|
[SNDRV_CTL_ELEM_TYPE_ENUMERATED] = 128,
|
|
[SNDRV_CTL_ELEM_TYPE_BYTES] = 512,
|
|
[SNDRV_CTL_ELEM_TYPE_IEC958] = 1,
|
|
[SNDRV_CTL_ELEM_TYPE_INTEGER64] = 64,
|
|
};
|
|
|
|
if (info->type < SNDRV_CTL_ELEM_TYPE_BOOLEAN ||
|
|
info->type > SNDRV_CTL_ELEM_TYPE_INTEGER64) {
|
|
if (card)
|
|
dev_err(card->dev,
|
|
"control %i:%i:%i:%s:%i: invalid type %d\n",
|
|
info->id.iface, info->id.device,
|
|
info->id.subdevice, info->id.name,
|
|
info->id.index, info->type);
|
|
return -EINVAL;
|
|
}
|
|
if (info->type == SNDRV_CTL_ELEM_TYPE_ENUMERATED &&
|
|
info->value.enumerated.items == 0) {
|
|
if (card)
|
|
dev_err(card->dev,
|
|
"control %i:%i:%i:%s:%i: zero enum items\n",
|
|
info->id.iface, info->id.device,
|
|
info->id.subdevice, info->id.name,
|
|
info->id.index);
|
|
return -EINVAL;
|
|
}
|
|
if (info->count > max_value_counts[info->type]) {
|
|
if (card)
|
|
dev_err(card->dev,
|
|
"control %i:%i:%i:%s:%i: invalid count %d\n",
|
|
info->id.iface, info->id.device,
|
|
info->id.subdevice, info->id.name,
|
|
info->id.index, info->count);
|
|
return -EINVAL;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
/* The capacity of struct snd_ctl_elem_value.value.*/
|
|
static const unsigned int value_sizes[] = {
|
|
[SNDRV_CTL_ELEM_TYPE_BOOLEAN] = sizeof(long),
|
|
[SNDRV_CTL_ELEM_TYPE_INTEGER] = sizeof(long),
|
|
[SNDRV_CTL_ELEM_TYPE_ENUMERATED] = sizeof(unsigned int),
|
|
[SNDRV_CTL_ELEM_TYPE_BYTES] = sizeof(unsigned char),
|
|
[SNDRV_CTL_ELEM_TYPE_IEC958] = sizeof(struct snd_aes_iec958),
|
|
[SNDRV_CTL_ELEM_TYPE_INTEGER64] = sizeof(long long),
|
|
};
|
|
|
|
#ifdef CONFIG_SND_CTL_VALIDATION
|
|
/* fill the remaining snd_ctl_elem_value data with the given pattern */
|
|
static void fill_remaining_elem_value(struct snd_ctl_elem_value *control,
|
|
struct snd_ctl_elem_info *info,
|
|
u32 pattern)
|
|
{
|
|
size_t offset = value_sizes[info->type] * info->count;
|
|
|
|
offset = (offset + sizeof(u32) - 1) / sizeof(u32);
|
|
memset32((u32 *)control->value.bytes.data + offset, pattern,
|
|
sizeof(control->value) / sizeof(u32) - offset);
|
|
}
|
|
|
|
/* check whether the given integer ctl value is valid */
|
|
static int sanity_check_int_value(struct snd_card *card,
|
|
const struct snd_ctl_elem_value *control,
|
|
const struct snd_ctl_elem_info *info,
|
|
int i)
|
|
{
|
|
long long lval, lmin, lmax, lstep;
|
|
u64 rem;
|
|
|
|
switch (info->type) {
|
|
default:
|
|
case SNDRV_CTL_ELEM_TYPE_BOOLEAN:
|
|
lval = control->value.integer.value[i];
|
|
lmin = 0;
|
|
lmax = 1;
|
|
lstep = 0;
|
|
break;
|
|
case SNDRV_CTL_ELEM_TYPE_INTEGER:
|
|
lval = control->value.integer.value[i];
|
|
lmin = info->value.integer.min;
|
|
lmax = info->value.integer.max;
|
|
lstep = info->value.integer.step;
|
|
break;
|
|
case SNDRV_CTL_ELEM_TYPE_INTEGER64:
|
|
lval = control->value.integer64.value[i];
|
|
lmin = info->value.integer64.min;
|
|
lmax = info->value.integer64.max;
|
|
lstep = info->value.integer64.step;
|
|
break;
|
|
case SNDRV_CTL_ELEM_TYPE_ENUMERATED:
|
|
lval = control->value.enumerated.item[i];
|
|
lmin = 0;
|
|
lmax = info->value.enumerated.items - 1;
|
|
lstep = 0;
|
|
break;
|
|
}
|
|
|
|
if (lval < lmin || lval > lmax) {
|
|
dev_err(card->dev,
|
|
"control %i:%i:%i:%s:%i: value out of range %lld (%lld/%lld) at count %i\n",
|
|
control->id.iface, control->id.device,
|
|
control->id.subdevice, control->id.name,
|
|
control->id.index, lval, lmin, lmax, i);
|
|
return -EINVAL;
|
|
}
|
|
if (lstep) {
|
|
div64_u64_rem(lval, lstep, &rem);
|
|
if (rem) {
|
|
dev_err(card->dev,
|
|
"control %i:%i:%i:%s:%i: unaligned value %lld (step %lld) at count %i\n",
|
|
control->id.iface, control->id.device,
|
|
control->id.subdevice, control->id.name,
|
|
control->id.index, lval, lstep, i);
|
|
return -EINVAL;
|
|
}
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
/* perform sanity checks to the given snd_ctl_elem_value object */
|
|
static int sanity_check_elem_value(struct snd_card *card,
|
|
const struct snd_ctl_elem_value *control,
|
|
const struct snd_ctl_elem_info *info,
|
|
u32 pattern)
|
|
{
|
|
size_t offset;
|
|
int i, ret = 0;
|
|
u32 *p;
|
|
|
|
switch (info->type) {
|
|
case SNDRV_CTL_ELEM_TYPE_BOOLEAN:
|
|
case SNDRV_CTL_ELEM_TYPE_INTEGER:
|
|
case SNDRV_CTL_ELEM_TYPE_INTEGER64:
|
|
case SNDRV_CTL_ELEM_TYPE_ENUMERATED:
|
|
for (i = 0; i < info->count; i++) {
|
|
ret = sanity_check_int_value(card, control, info, i);
|
|
if (ret < 0)
|
|
return ret;
|
|
}
|
|
break;
|
|
default:
|
|
break;
|
|
}
|
|
|
|
/* check whether the remaining area kept untouched */
|
|
offset = value_sizes[info->type] * info->count;
|
|
offset = (offset + sizeof(u32) - 1) / sizeof(u32);
|
|
p = (u32 *)control->value.bytes.data + offset;
|
|
for (; offset < sizeof(control->value) / sizeof(u32); offset++, p++) {
|
|
if (*p != pattern) {
|
|
ret = -EINVAL;
|
|
break;
|
|
}
|
|
*p = 0; /* clear the checked area */
|
|
}
|
|
|
|
return ret;
|
|
}
|
|
#else
|
|
static inline void fill_remaining_elem_value(struct snd_ctl_elem_value *control,
|
|
struct snd_ctl_elem_info *info,
|
|
u32 pattern)
|
|
{
|
|
}
|
|
|
|
static inline int sanity_check_elem_value(struct snd_card *card,
|
|
struct snd_ctl_elem_value *control,
|
|
struct snd_ctl_elem_info *info,
|
|
u32 pattern)
|
|
{
|
|
return 0;
|
|
}
|
|
#endif
|
|
|
|
static int __snd_ctl_elem_info(struct snd_card *card,
|
|
struct snd_kcontrol *kctl,
|
|
struct snd_ctl_elem_info *info,
|
|
struct snd_ctl_file *ctl)
|
|
{
|
|
struct snd_kcontrol_volatile *vd;
|
|
unsigned int index_offset;
|
|
int result;
|
|
|
|
#ifdef CONFIG_SND_DEBUG
|
|
info->access = 0;
|
|
#endif
|
|
result = kctl->info(kctl, info);
|
|
if (result >= 0) {
|
|
snd_BUG_ON(info->access);
|
|
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 = pid_vnr(vd->owner->pid);
|
|
} else {
|
|
info->owner = -1;
|
|
}
|
|
if (!snd_ctl_skip_validation(info) &&
|
|
snd_ctl_check_elem_info(card, info) < 0)
|
|
result = -EINVAL;
|
|
}
|
|
return result;
|
|
}
|
|
|
|
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;
|
|
int result;
|
|
|
|
down_read(&card->controls_rwsem);
|
|
kctl = snd_ctl_find_id(card, &info->id);
|
|
if (kctl == NULL)
|
|
result = -ENOENT;
|
|
else
|
|
result = __snd_ctl_elem_info(card, kctl, info, ctl);
|
|
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_power_wait(ctl->card, SNDRV_CTL_POWER_D0);
|
|
if (result < 0)
|
|
return result;
|
|
result = snd_ctl_elem_info(ctl, &info);
|
|
if (result < 0)
|
|
return result;
|
|
/* drop internal access flags */
|
|
info.access &= ~SNDRV_CTL_ELEM_ACCESS_SKIP_CHECK;
|
|
if (copy_to_user(_info, &info, sizeof(info)))
|
|
return -EFAULT;
|
|
return result;
|
|
}
|
|
|
|
static 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;
|
|
struct snd_ctl_elem_info info;
|
|
const u32 pattern = 0xdeadbeef;
|
|
int ret;
|
|
|
|
kctl = snd_ctl_find_id(card, &control->id);
|
|
if (kctl == NULL)
|
|
return -ENOENT;
|
|
|
|
index_offset = snd_ctl_get_ioff(kctl, &control->id);
|
|
vd = &kctl->vd[index_offset];
|
|
if (!(vd->access & SNDRV_CTL_ELEM_ACCESS_READ) || kctl->get == NULL)
|
|
return -EPERM;
|
|
|
|
snd_ctl_build_ioff(&control->id, kctl, index_offset);
|
|
|
|
#ifdef CONFIG_SND_CTL_VALIDATION
|
|
/* info is needed only for validation */
|
|
memset(&info, 0, sizeof(info));
|
|
info.id = control->id;
|
|
ret = __snd_ctl_elem_info(card, kctl, &info, NULL);
|
|
if (ret < 0)
|
|
return ret;
|
|
#endif
|
|
|
|
if (!snd_ctl_skip_validation(&info))
|
|
fill_remaining_elem_value(control, &info, pattern);
|
|
ret = kctl->get(kctl, control);
|
|
if (ret < 0)
|
|
return ret;
|
|
if (!snd_ctl_skip_validation(&info) &&
|
|
sanity_check_elem_value(card, control, &info, pattern) < 0) {
|
|
dev_err(card->dev,
|
|
"control %i:%i:%i:%s:%i: access overflow\n",
|
|
control->id.iface, control->id.device,
|
|
control->id.subdevice, control->id.name,
|
|
control->id.index);
|
|
return -EINVAL;
|
|
}
|
|
return ret;
|
|
}
|
|
|
|
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 = memdup_user(_control, sizeof(*control));
|
|
if (IS_ERR(control))
|
|
return PTR_ERR(control);
|
|
|
|
result = snd_power_wait(card, SNDRV_CTL_POWER_D0);
|
|
if (result < 0)
|
|
goto error;
|
|
|
|
down_read(&card->controls_rwsem);
|
|
result = snd_ctl_elem_read(card, control);
|
|
up_read(&card->controls_rwsem);
|
|
if (result < 0)
|
|
goto error;
|
|
|
|
if (copy_to_user(_control, control, sizeof(*control)))
|
|
result = -EFAULT;
|
|
error:
|
|
kfree(control);
|
|
return result;
|
|
}
|
|
|
|
static 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;
|
|
|
|
kctl = snd_ctl_find_id(card, &control->id);
|
|
if (kctl == NULL)
|
|
return -ENOENT;
|
|
|
|
index_offset = snd_ctl_get_ioff(kctl, &control->id);
|
|
vd = &kctl->vd[index_offset];
|
|
if (!(vd->access & SNDRV_CTL_ELEM_ACCESS_WRITE) || kctl->put == NULL ||
|
|
(file && vd->owner && vd->owner != file)) {
|
|
return -EPERM;
|
|
}
|
|
|
|
snd_ctl_build_ioff(&control->id, kctl, index_offset);
|
|
result = kctl->put(kctl, control);
|
|
if (result < 0)
|
|
return result;
|
|
|
|
if (result > 0) {
|
|
struct snd_ctl_elem_id id = control->id;
|
|
snd_ctl_notify(card, SNDRV_CTL_EVENT_MASK_VALUE, &id);
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
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;
|
|
struct snd_card *card;
|
|
int result;
|
|
|
|
control = memdup_user(_control, sizeof(*control));
|
|
if (IS_ERR(control))
|
|
return PTR_ERR(control);
|
|
|
|
card = file->card;
|
|
result = snd_power_wait(card, SNDRV_CTL_POWER_D0);
|
|
if (result < 0)
|
|
goto error;
|
|
|
|
down_write(&card->controls_rwsem);
|
|
result = snd_ctl_elem_write(card, file, control);
|
|
up_write(&card->controls_rwsem);
|
|
if (result < 0)
|
|
goto error;
|
|
|
|
if (copy_to_user(_control, control, sizeof(*control)))
|
|
result = -EFAULT;
|
|
error:
|
|
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;
|
|
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;
|
|
result = 0;
|
|
}
|
|
}
|
|
up_write(&card->controls_rwsem);
|
|
return result;
|
|
}
|
|
|
|
struct user_element {
|
|
struct snd_ctl_elem_info info;
|
|
struct snd_card *card;
|
|
char *elem_data; /* element data */
|
|
unsigned long elem_data_size; /* size of element data in bytes */
|
|
void *tlv_data; /* TLV data */
|
|
unsigned long tlv_data_size; /* TLV data size */
|
|
void *priv_data; /* private data (like strings for enumerated type) */
|
|
};
|
|
|
|
static int snd_ctl_elem_user_info(struct snd_kcontrol *kcontrol,
|
|
struct snd_ctl_elem_info *uinfo)
|
|
{
|
|
struct user_element *ue = kcontrol->private_data;
|
|
unsigned int offset;
|
|
|
|
offset = snd_ctl_get_ioff(kcontrol, &uinfo->id);
|
|
*uinfo = ue->info;
|
|
snd_ctl_build_ioff(&uinfo->id, kcontrol, offset);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int snd_ctl_elem_user_enum_info(struct snd_kcontrol *kcontrol,
|
|
struct snd_ctl_elem_info *uinfo)
|
|
{
|
|
struct user_element *ue = kcontrol->private_data;
|
|
const char *names;
|
|
unsigned int item;
|
|
unsigned int offset;
|
|
|
|
item = uinfo->value.enumerated.item;
|
|
|
|
offset = snd_ctl_get_ioff(kcontrol, &uinfo->id);
|
|
*uinfo = ue->info;
|
|
snd_ctl_build_ioff(&uinfo->id, kcontrol, offset);
|
|
|
|
item = min(item, uinfo->value.enumerated.items - 1);
|
|
uinfo->value.enumerated.item = item;
|
|
|
|
names = ue->priv_data;
|
|
for (; item > 0; --item)
|
|
names += strlen(names) + 1;
|
|
strcpy(uinfo->value.enumerated.name, names);
|
|
|
|
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;
|
|
unsigned int size = ue->elem_data_size;
|
|
char *src = ue->elem_data +
|
|
snd_ctl_get_ioff(kcontrol, &ucontrol->id) * size;
|
|
|
|
memcpy(&ucontrol->value, src, 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;
|
|
unsigned int size = ue->elem_data_size;
|
|
char *dst = ue->elem_data +
|
|
snd_ctl_get_ioff(kcontrol, &ucontrol->id) * size;
|
|
|
|
change = memcmp(&ucontrol->value, dst, size) != 0;
|
|
if (change)
|
|
memcpy(dst, &ucontrol->value, size);
|
|
return change;
|
|
}
|
|
|
|
static int replace_user_tlv(struct snd_kcontrol *kctl, unsigned int __user *buf,
|
|
unsigned int size)
|
|
{
|
|
struct user_element *ue = kctl->private_data;
|
|
unsigned int *container;
|
|
struct snd_ctl_elem_id id;
|
|
unsigned int mask = 0;
|
|
int i;
|
|
int change;
|
|
|
|
if (size > 1024 * 128) /* sane value */
|
|
return -EINVAL;
|
|
|
|
container = vmemdup_user(buf, size);
|
|
if (IS_ERR(container))
|
|
return PTR_ERR(container);
|
|
|
|
change = ue->tlv_data_size != size;
|
|
if (!change)
|
|
change = memcmp(ue->tlv_data, container, size) != 0;
|
|
if (!change) {
|
|
kvfree(container);
|
|
return 0;
|
|
}
|
|
|
|
if (ue->tlv_data == NULL) {
|
|
/* Now TLV data is available. */
|
|
for (i = 0; i < kctl->count; ++i)
|
|
kctl->vd[i].access |= SNDRV_CTL_ELEM_ACCESS_TLV_READ;
|
|
mask = SNDRV_CTL_EVENT_MASK_INFO;
|
|
}
|
|
|
|
kvfree(ue->tlv_data);
|
|
ue->tlv_data = container;
|
|
ue->tlv_data_size = size;
|
|
|
|
mask |= SNDRV_CTL_EVENT_MASK_TLV;
|
|
for (i = 0; i < kctl->count; ++i) {
|
|
snd_ctl_build_ioff(&id, kctl, i);
|
|
snd_ctl_notify(ue->card, mask, &id);
|
|
}
|
|
|
|
return change;
|
|
}
|
|
|
|
static int read_user_tlv(struct snd_kcontrol *kctl, unsigned int __user *buf,
|
|
unsigned int size)
|
|
{
|
|
struct user_element *ue = kctl->private_data;
|
|
|
|
if (ue->tlv_data_size == 0 || ue->tlv_data == NULL)
|
|
return -ENXIO;
|
|
|
|
if (size < ue->tlv_data_size)
|
|
return -ENOSPC;
|
|
|
|
if (copy_to_user(buf, ue->tlv_data, ue->tlv_data_size))
|
|
return -EFAULT;
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int snd_ctl_elem_user_tlv(struct snd_kcontrol *kctl, int op_flag,
|
|
unsigned int size, unsigned int __user *buf)
|
|
{
|
|
if (op_flag == SNDRV_CTL_TLV_OP_WRITE)
|
|
return replace_user_tlv(kctl, buf, size);
|
|
else
|
|
return read_user_tlv(kctl, buf, size);
|
|
}
|
|
|
|
static int snd_ctl_elem_init_enum_names(struct user_element *ue)
|
|
{
|
|
char *names, *p;
|
|
size_t buf_len, name_len;
|
|
unsigned int i;
|
|
const uintptr_t user_ptrval = ue->info.value.enumerated.names_ptr;
|
|
|
|
if (ue->info.value.enumerated.names_length > 64 * 1024)
|
|
return -EINVAL;
|
|
|
|
names = vmemdup_user((const void __user *)user_ptrval,
|
|
ue->info.value.enumerated.names_length);
|
|
if (IS_ERR(names))
|
|
return PTR_ERR(names);
|
|
|
|
/* check that there are enough valid names */
|
|
buf_len = ue->info.value.enumerated.names_length;
|
|
p = names;
|
|
for (i = 0; i < ue->info.value.enumerated.items; ++i) {
|
|
name_len = strnlen(p, buf_len);
|
|
if (name_len == 0 || name_len >= 64 || name_len == buf_len) {
|
|
kvfree(names);
|
|
return -EINVAL;
|
|
}
|
|
p += name_len + 1;
|
|
buf_len -= name_len + 1;
|
|
}
|
|
|
|
ue->priv_data = names;
|
|
ue->info.value.enumerated.names_ptr = 0;
|
|
|
|
return 0;
|
|
}
|
|
|
|
static void snd_ctl_elem_user_free(struct snd_kcontrol *kcontrol)
|
|
{
|
|
struct user_element *ue = kcontrol->private_data;
|
|
|
|
kvfree(ue->tlv_data);
|
|
kvfree(ue->priv_data);
|
|
kfree(ue);
|
|
}
|
|
|
|
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;
|
|
unsigned int count;
|
|
unsigned int access;
|
|
long private_size;
|
|
struct user_element *ue;
|
|
unsigned int offset;
|
|
int err;
|
|
|
|
if (!*info->id.name)
|
|
return -EINVAL;
|
|
if (strnlen(info->id.name, sizeof(info->id.name)) >= sizeof(info->id.name))
|
|
return -EINVAL;
|
|
|
|
/* Delete a control to replace them if needed. */
|
|
if (replace) {
|
|
info->id.numid = 0;
|
|
err = snd_ctl_remove_user_ctl(file, &info->id);
|
|
if (err)
|
|
return err;
|
|
}
|
|
|
|
/*
|
|
* The number of userspace controls are counted control by control,
|
|
* not element by element.
|
|
*/
|
|
if (card->user_ctl_count + 1 > MAX_USER_CONTROLS)
|
|
return -ENOMEM;
|
|
|
|
/* Check the number of elements for this userspace control. */
|
|
count = info->owner;
|
|
if (count == 0)
|
|
count = 1;
|
|
|
|
/* Arrange access permissions if needed. */
|
|
access = info->access;
|
|
if (access == 0)
|
|
access = SNDRV_CTL_ELEM_ACCESS_READWRITE;
|
|
access &= (SNDRV_CTL_ELEM_ACCESS_READWRITE |
|
|
SNDRV_CTL_ELEM_ACCESS_INACTIVE |
|
|
SNDRV_CTL_ELEM_ACCESS_TLV_WRITE);
|
|
|
|
/* In initial state, nothing is available as TLV container. */
|
|
if (access & SNDRV_CTL_ELEM_ACCESS_TLV_WRITE)
|
|
access |= SNDRV_CTL_ELEM_ACCESS_TLV_CALLBACK;
|
|
access |= SNDRV_CTL_ELEM_ACCESS_USER;
|
|
|
|
/*
|
|
* Check information and calculate the size of data specific to
|
|
* this userspace control.
|
|
*/
|
|
/* pass NULL to card for suppressing error messages */
|
|
err = snd_ctl_check_elem_info(NULL, info);
|
|
if (err < 0)
|
|
return err;
|
|
/* user-space control doesn't allow zero-size data */
|
|
if (info->count < 1)
|
|
return -EINVAL;
|
|
private_size = value_sizes[info->type] * info->count;
|
|
|
|
/*
|
|
* Keep memory object for this userspace control. After passing this
|
|
* code block, the instance should be freed by snd_ctl_free_one().
|
|
*
|
|
* Note that these elements in this control are locked.
|
|
*/
|
|
err = snd_ctl_new(&kctl, count, access, file);
|
|
if (err < 0)
|
|
return err;
|
|
memcpy(&kctl->id, &info->id, sizeof(kctl->id));
|
|
kctl->private_data = kzalloc(sizeof(struct user_element) + private_size * count,
|
|
GFP_KERNEL);
|
|
if (kctl->private_data == NULL) {
|
|
kfree(kctl);
|
|
return -ENOMEM;
|
|
}
|
|
kctl->private_free = snd_ctl_elem_user_free;
|
|
|
|
/* Set private data for this userspace control. */
|
|
ue = (struct user_element *)kctl->private_data;
|
|
ue->card = card;
|
|
ue->info = *info;
|
|
ue->info.access = 0;
|
|
ue->elem_data = (char *)ue + sizeof(*ue);
|
|
ue->elem_data_size = private_size;
|
|
if (ue->info.type == SNDRV_CTL_ELEM_TYPE_ENUMERATED) {
|
|
err = snd_ctl_elem_init_enum_names(ue);
|
|
if (err < 0) {
|
|
snd_ctl_free_one(kctl);
|
|
return err;
|
|
}
|
|
}
|
|
|
|
/* Set callback functions. */
|
|
if (info->type == SNDRV_CTL_ELEM_TYPE_ENUMERATED)
|
|
kctl->info = snd_ctl_elem_user_enum_info;
|
|
else
|
|
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;
|
|
if (access & SNDRV_CTL_ELEM_ACCESS_TLV_WRITE)
|
|
kctl->tlv.c = snd_ctl_elem_user_tlv;
|
|
|
|
/* This function manage to free the instance on failure. */
|
|
down_write(&card->controls_rwsem);
|
|
err = __snd_ctl_add_replace(card, kctl, CTL_ADD_EXCLUSIVE);
|
|
if (err < 0) {
|
|
snd_ctl_free_one(kctl);
|
|
goto unlock;
|
|
}
|
|
offset = snd_ctl_get_ioff(kctl, &info->id);
|
|
snd_ctl_build_ioff(&info->id, kctl, offset);
|
|
/*
|
|
* Here we cannot fill any field for the number of elements added by
|
|
* this operation because there're no specific fields. The usage of
|
|
* 'owner' field for this purpose may cause any bugs to userspace
|
|
* applications because the field originally means PID of a process
|
|
* which locks the element.
|
|
*/
|
|
|
|
card->user_ctl_count++;
|
|
|
|
unlock:
|
|
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;
|
|
int err;
|
|
|
|
if (copy_from_user(&info, _info, sizeof(info)))
|
|
return -EFAULT;
|
|
err = snd_ctl_elem_add(file, &info, replace);
|
|
if (err < 0)
|
|
return err;
|
|
if (copy_to_user(_info, &info, sizeof(info))) {
|
|
snd_ctl_remove_user_ctl(file, &info.id);
|
|
return -EFAULT;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int snd_ctl_elem_remove(struct snd_ctl_file *file,
|
|
struct snd_ctl_elem_id __user *_id)
|
|
{
|
|
struct snd_ctl_elem_id id;
|
|
|
|
if (copy_from_user(&id, _id, sizeof(id)))
|
|
return -EFAULT;
|
|
return snd_ctl_remove_user_ctl(file, &id);
|
|
}
|
|
|
|
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 int call_tlv_handler(struct snd_ctl_file *file, int op_flag,
|
|
struct snd_kcontrol *kctl,
|
|
struct snd_ctl_elem_id *id,
|
|
unsigned int __user *buf, unsigned int size)
|
|
{
|
|
static const struct {
|
|
int op;
|
|
int perm;
|
|
} pairs[] = {
|
|
{SNDRV_CTL_TLV_OP_READ, SNDRV_CTL_ELEM_ACCESS_TLV_READ},
|
|
{SNDRV_CTL_TLV_OP_WRITE, SNDRV_CTL_ELEM_ACCESS_TLV_WRITE},
|
|
{SNDRV_CTL_TLV_OP_CMD, SNDRV_CTL_ELEM_ACCESS_TLV_COMMAND},
|
|
};
|
|
struct snd_kcontrol_volatile *vd = &kctl->vd[snd_ctl_get_ioff(kctl, id)];
|
|
int i;
|
|
|
|
/* Check support of the request for this element. */
|
|
for (i = 0; i < ARRAY_SIZE(pairs); ++i) {
|
|
if (op_flag == pairs[i].op && (vd->access & pairs[i].perm))
|
|
break;
|
|
}
|
|
if (i == ARRAY_SIZE(pairs))
|
|
return -ENXIO;
|
|
|
|
if (kctl->tlv.c == NULL)
|
|
return -ENXIO;
|
|
|
|
/* Write and command operations are not allowed for locked element. */
|
|
if (op_flag != SNDRV_CTL_TLV_OP_READ &&
|
|
vd->owner != NULL && vd->owner != file)
|
|
return -EPERM;
|
|
|
|
return kctl->tlv.c(kctl, op_flag, size, buf);
|
|
}
|
|
|
|
static int read_tlv_buf(struct snd_kcontrol *kctl, struct snd_ctl_elem_id *id,
|
|
unsigned int __user *buf, unsigned int size)
|
|
{
|
|
struct snd_kcontrol_volatile *vd = &kctl->vd[snd_ctl_get_ioff(kctl, id)];
|
|
unsigned int len;
|
|
|
|
if (!(vd->access & SNDRV_CTL_ELEM_ACCESS_TLV_READ))
|
|
return -ENXIO;
|
|
|
|
if (kctl->tlv.p == NULL)
|
|
return -ENXIO;
|
|
|
|
len = sizeof(unsigned int) * 2 + kctl->tlv.p[1];
|
|
if (size < len)
|
|
return -ENOMEM;
|
|
|
|
if (copy_to_user(buf, kctl->tlv.p, len))
|
|
return -EFAULT;
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int snd_ctl_tlv_ioctl(struct snd_ctl_file *file,
|
|
struct snd_ctl_tlv __user *buf,
|
|
int op_flag)
|
|
{
|
|
struct snd_ctl_tlv header;
|
|
unsigned int __user *container;
|
|
unsigned int container_size;
|
|
struct snd_kcontrol *kctl;
|
|
struct snd_ctl_elem_id id;
|
|
struct snd_kcontrol_volatile *vd;
|
|
|
|
if (copy_from_user(&header, buf, sizeof(header)))
|
|
return -EFAULT;
|
|
|
|
/* In design of control core, numerical ID starts at 1. */
|
|
if (header.numid == 0)
|
|
return -EINVAL;
|
|
|
|
/* At least, container should include type and length fields. */
|
|
if (header.length < sizeof(unsigned int) * 2)
|
|
return -EINVAL;
|
|
container_size = header.length;
|
|
container = buf->tlv;
|
|
|
|
kctl = snd_ctl_find_numid(file->card, header.numid);
|
|
if (kctl == NULL)
|
|
return -ENOENT;
|
|
|
|
/* Calculate index of the element in this set. */
|
|
id = kctl->id;
|
|
snd_ctl_build_ioff(&id, kctl, header.numid - id.numid);
|
|
vd = &kctl->vd[snd_ctl_get_ioff(kctl, &id)];
|
|
|
|
if (vd->access & SNDRV_CTL_ELEM_ACCESS_TLV_CALLBACK) {
|
|
return call_tlv_handler(file, op_flag, kctl, &id, container,
|
|
container_size);
|
|
} else {
|
|
if (op_flag == SNDRV_CTL_TLV_OP_READ) {
|
|
return read_tlv_buf(kctl, &id, container,
|
|
container_size);
|
|
}
|
|
}
|
|
|
|
/* Not supported. */
|
|
return -ENXIO;
|
|
}
|
|
|
|
static long snd_ctl_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
|
|
{
|
|
struct snd_ctl_file *ctl;
|
|
struct snd_card *card;
|
|
struct snd_kctl_ioctl *p;
|
|
void __user *argp = (void __user *)arg;
|
|
int __user *ip = argp;
|
|
int err;
|
|
|
|
ctl = file->private_data;
|
|
card = ctl->card;
|
|
if (snd_BUG_ON(!card))
|
|
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(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(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_TLV_READ:
|
|
down_read(&ctl->card->controls_rwsem);
|
|
err = snd_ctl_tlv_ioctl(ctl, argp, SNDRV_CTL_TLV_OP_READ);
|
|
up_read(&ctl->card->controls_rwsem);
|
|
return err;
|
|
case SNDRV_CTL_IOCTL_TLV_WRITE:
|
|
down_write(&ctl->card->controls_rwsem);
|
|
err = snd_ctl_tlv_ioctl(ctl, argp, SNDRV_CTL_TLV_OP_WRITE);
|
|
up_write(&ctl->card->controls_rwsem);
|
|
return err;
|
|
case SNDRV_CTL_IOCTL_TLV_COMMAND:
|
|
down_write(&ctl->card->controls_rwsem);
|
|
err = snd_ctl_tlv_ioctl(ctl, argp, SNDRV_CTL_TLV_OP_CMD);
|
|
up_write(&ctl->card->controls_rwsem);
|
|
return err;
|
|
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_entry(p, &snd_control_ioctls, list) {
|
|
err = p->fioctl(card, ctl, cmd, arg);
|
|
if (err != -ENOIOCTLCMD) {
|
|
up_read(&snd_ioctl_rwsem);
|
|
return err;
|
|
}
|
|
}
|
|
up_read(&snd_ioctl_rwsem);
|
|
dev_dbg(card->dev, "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;
|
|
if (snd_BUG_ON(!ctl || !ctl->card))
|
|
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_entry_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 (ctl->card->shutdown)
|
|
return -ENODEV;
|
|
if (signal_pending(current))
|
|
return -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 __poll_t snd_ctl_poll(struct file *file, poll_table * wait)
|
|
{
|
|
__poll_t 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 |= EPOLLIN | EPOLLRDNORM;
|
|
|
|
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;
|
|
}
|
|
|
|
/**
|
|
* snd_ctl_register_ioctl - register the device-specific control-ioctls
|
|
* @fcn: ioctl callback function
|
|
*
|
|
* called from each device manager like pcm.c, hwdep.c, etc.
|
|
*/
|
|
int snd_ctl_register_ioctl(snd_kctl_ioctl_func_t fcn)
|
|
{
|
|
return _snd_ctl_register_ioctl(fcn, &snd_control_ioctls);
|
|
}
|
|
EXPORT_SYMBOL(snd_ctl_register_ioctl);
|
|
|
|
#ifdef CONFIG_COMPAT
|
|
/**
|
|
* snd_ctl_register_ioctl_compat - register the device-specific 32bit compat
|
|
* control-ioctls
|
|
* @fcn: ioctl callback function
|
|
*/
|
|
int snd_ctl_register_ioctl_compat(snd_kctl_ioctl_func_t fcn)
|
|
{
|
|
return _snd_ctl_register_ioctl(fcn, &snd_control_compat_ioctls);
|
|
}
|
|
EXPORT_SYMBOL(snd_ctl_register_ioctl_compat);
|
|
#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 snd_kctl_ioctl *p;
|
|
|
|
if (snd_BUG_ON(!fcn))
|
|
return -EINVAL;
|
|
down_write(&snd_ioctl_rwsem);
|
|
list_for_each_entry(p, lists, 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;
|
|
}
|
|
|
|
/**
|
|
* snd_ctl_unregister_ioctl - de-register the device-specific control-ioctls
|
|
* @fcn: ioctl callback function to unregister
|
|
*/
|
|
int snd_ctl_unregister_ioctl(snd_kctl_ioctl_func_t fcn)
|
|
{
|
|
return _snd_ctl_unregister_ioctl(fcn, &snd_control_ioctls);
|
|
}
|
|
EXPORT_SYMBOL(snd_ctl_unregister_ioctl);
|
|
|
|
#ifdef CONFIG_COMPAT
|
|
/**
|
|
* snd_ctl_unregister_ioctl - de-register the device-specific compat 32bit
|
|
* control-ioctls
|
|
* @fcn: ioctl callback function to unregister
|
|
*/
|
|
int snd_ctl_unregister_ioctl_compat(snd_kctl_ioctl_func_t fcn)
|
|
{
|
|
return _snd_ctl_unregister_ioctl(fcn, &snd_control_compat_ioctls);
|
|
}
|
|
EXPORT_SYMBOL(snd_ctl_unregister_ioctl_compat);
|
|
#endif
|
|
|
|
static int snd_ctl_fasync(int fd, struct file * file, int on)
|
|
{
|
|
struct snd_ctl_file *ctl;
|
|
|
|
ctl = file->private_data;
|
|
return fasync_helper(fd, file, on, &ctl->fasync);
|
|
}
|
|
|
|
/* return the preferred subdevice number if already assigned;
|
|
* otherwise return -1
|
|
*/
|
|
int snd_ctl_get_preferred_subdevice(struct snd_card *card, int type)
|
|
{
|
|
struct snd_ctl_file *kctl;
|
|
int subdevice = -1;
|
|
|
|
read_lock(&card->ctl_files_rwlock);
|
|
list_for_each_entry(kctl, &card->ctl_files, list) {
|
|
if (kctl->pid == task_pid(current)) {
|
|
subdevice = kctl->preferred_subdevice[type];
|
|
if (subdevice != -1)
|
|
break;
|
|
}
|
|
}
|
|
read_unlock(&card->ctl_files_rwlock);
|
|
return subdevice;
|
|
}
|
|
EXPORT_SYMBOL_GPL(snd_ctl_get_preferred_subdevice);
|
|
|
|
/*
|
|
* ioctl32 compat
|
|
*/
|
|
#ifdef CONFIG_COMPAT
|
|
#include "control_compat.c"
|
|
#else
|
|
#define snd_ctl_ioctl_compat NULL
|
|
#endif
|
|
|
|
/*
|
|
* INIT PART
|
|
*/
|
|
|
|
static const struct file_operations snd_ctl_f_ops =
|
|
{
|
|
.owner = THIS_MODULE,
|
|
.read = snd_ctl_read,
|
|
.open = snd_ctl_open,
|
|
.release = snd_ctl_release,
|
|
.llseek = no_llseek,
|
|
.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;
|
|
|
|
return snd_register_device(SNDRV_DEVICE_TYPE_CONTROL, card, -1,
|
|
&snd_ctl_f_ops, card, &card->ctl_dev);
|
|
}
|
|
|
|
/*
|
|
* disconnection of the control device
|
|
*/
|
|
static int snd_ctl_dev_disconnect(struct snd_device *device)
|
|
{
|
|
struct snd_card *card = device->device_data;
|
|
struct snd_ctl_file *ctl;
|
|
|
|
read_lock(&card->ctl_files_rwlock);
|
|
list_for_each_entry(ctl, &card->ctl_files, list) {
|
|
wake_up(&ctl->change_sleep);
|
|
kill_fasync(&ctl->fasync, SIGIO, POLL_ERR);
|
|
}
|
|
read_unlock(&card->ctl_files_rwlock);
|
|
|
|
return snd_unregister_device(&card->ctl_dev);
|
|
}
|
|
|
|
/*
|
|
* 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);
|
|
put_device(&card->ctl_dev);
|
|
return 0;
|
|
}
|
|
|
|
/*
|
|
* create control core:
|
|
* called from init.c
|
|
*/
|
|
int snd_ctl_create(struct snd_card *card)
|
|
{
|
|
static const struct snd_device_ops ops = {
|
|
.dev_free = snd_ctl_dev_free,
|
|
.dev_register = snd_ctl_dev_register,
|
|
.dev_disconnect = snd_ctl_dev_disconnect,
|
|
};
|
|
int err;
|
|
|
|
if (snd_BUG_ON(!card))
|
|
return -ENXIO;
|
|
if (snd_BUG_ON(card->number < 0 || card->number >= SNDRV_CARDS))
|
|
return -ENXIO;
|
|
|
|
snd_device_initialize(&card->ctl_dev, card);
|
|
dev_set_name(&card->ctl_dev, "controlC%d", card->number);
|
|
|
|
err = snd_device_new(card, SNDRV_DEV_CONTROL, card, &ops);
|
|
if (err < 0)
|
|
put_device(&card->ctl_dev);
|
|
return err;
|
|
}
|
|
|
|
/*
|
|
* Frequently used control callbacks/helpers
|
|
*/
|
|
|
|
/**
|
|
* snd_ctl_boolean_mono_info - Helper function for a standard boolean info
|
|
* callback with a mono channel
|
|
* @kcontrol: the kcontrol instance
|
|
* @uinfo: info to store
|
|
*
|
|
* This is a function that can be used as info callback for a standard
|
|
* boolean control with a single mono channel.
|
|
*/
|
|
int snd_ctl_boolean_mono_info(struct snd_kcontrol *kcontrol,
|
|
struct snd_ctl_elem_info *uinfo)
|
|
{
|
|
uinfo->type = SNDRV_CTL_ELEM_TYPE_BOOLEAN;
|
|
uinfo->count = 1;
|
|
uinfo->value.integer.min = 0;
|
|
uinfo->value.integer.max = 1;
|
|
return 0;
|
|
}
|
|
EXPORT_SYMBOL(snd_ctl_boolean_mono_info);
|
|
|
|
/**
|
|
* snd_ctl_boolean_stereo_info - Helper function for a standard boolean info
|
|
* callback with stereo two channels
|
|
* @kcontrol: the kcontrol instance
|
|
* @uinfo: info to store
|
|
*
|
|
* This is a function that can be used as info callback for a standard
|
|
* boolean control with stereo two channels.
|
|
*/
|
|
int snd_ctl_boolean_stereo_info(struct snd_kcontrol *kcontrol,
|
|
struct snd_ctl_elem_info *uinfo)
|
|
{
|
|
uinfo->type = SNDRV_CTL_ELEM_TYPE_BOOLEAN;
|
|
uinfo->count = 2;
|
|
uinfo->value.integer.min = 0;
|
|
uinfo->value.integer.max = 1;
|
|
return 0;
|
|
}
|
|
EXPORT_SYMBOL(snd_ctl_boolean_stereo_info);
|
|
|
|
/**
|
|
* snd_ctl_enum_info - fills the info structure for an enumerated control
|
|
* @info: the structure to be filled
|
|
* @channels: the number of the control's channels; often one
|
|
* @items: the number of control values; also the size of @names
|
|
* @names: an array containing the names of all control values
|
|
*
|
|
* Sets all required fields in @info to their appropriate values.
|
|
* If the control's accessibility is not the default (readable and writable),
|
|
* the caller has to fill @info->access.
|
|
*
|
|
* Return: Zero.
|
|
*/
|
|
int snd_ctl_enum_info(struct snd_ctl_elem_info *info, unsigned int channels,
|
|
unsigned int items, const char *const names[])
|
|
{
|
|
info->type = SNDRV_CTL_ELEM_TYPE_ENUMERATED;
|
|
info->count = channels;
|
|
info->value.enumerated.items = items;
|
|
if (!items)
|
|
return 0;
|
|
if (info->value.enumerated.item >= items)
|
|
info->value.enumerated.item = items - 1;
|
|
WARN(strlen(names[info->value.enumerated.item]) >= sizeof(info->value.enumerated.name),
|
|
"ALSA: too long item name '%s'\n",
|
|
names[info->value.enumerated.item]);
|
|
strlcpy(info->value.enumerated.name,
|
|
names[info->value.enumerated.item],
|
|
sizeof(info->value.enumerated.name));
|
|
return 0;
|
|
}
|
|
EXPORT_SYMBOL(snd_ctl_enum_info);
|