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2145 lines
55 KiB
2145 lines
55 KiB
// SPDX-License-Identifier: GPL-2.0-or-later |
|
/* |
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* Routines for driver control interface |
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* Copyright (c) by Jaroslav Kysela <[email protected]> |
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*/ |
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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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|
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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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|
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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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|
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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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|
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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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|
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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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|
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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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|
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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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|
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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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|
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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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|
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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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/** |
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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_irqsave(&card->ctl_files_rwlock, flags); |
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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(&ctl->read_lock); |
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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(&ctl->read_lock); |
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kill_fasync(&ctl->fasync, SIGIO, POLL_IN); |
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} |
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read_unlock_irqrestore(&card->ctl_files_rwlock, flags); |
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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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|
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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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|
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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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|
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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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|
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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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strscpy(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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|
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kctl->private_value = ncontrol->private_value; |
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kctl->private_data = private_data; |
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|
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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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|
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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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|
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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) { |
|
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); |
|
return -EBUSY; |
|
} |
|
|
|
err = snd_ctl_remove(card, old); |
|
if (err < 0) |
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return err; |
|
} |
|
|
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if (snd_ctl_find_hole(card, kcontrol->count) < 0) |
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return -ENOMEM; |
|
|
|
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; |
|
card->last_numid += kcontrol->count; |
|
|
|
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); |
|
|
|
return 0; |
|
} |
|
|
|
static int snd_ctl_add_replace(struct snd_card *card, |
|
struct snd_kcontrol *kcontrol, |
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enum snd_ctl_add_mode mode) |
|
{ |
|
int err = -EINVAL; |
|
|
|
if (! kcontrol) |
|
return err; |
|
if (snd_BUG_ON(!card || !kcontrol->info)) |
|
goto error; |
|
|
|
down_write(&card->controls_rwsem); |
|
err = __snd_ctl_add_replace(card, kcontrol, mode); |
|
up_write(&card->controls_rwsem); |
|
if (err < 0) |
|
goto error; |
|
return 0; |
|
|
|
error: |
|
snd_ctl_free_one(kcontrol); |
|
return err; |
|
} |
|
|
|
/** |
|
* snd_ctl_add - add the control instance to the card |
|
* @card: the card instance |
|
* @kcontrol: the control instance to add |
|
* |
|
* Adds the control instance created via snd_ctl_new() or |
|
* snd_ctl_new1() to the given card. Assigns also an unique |
|
* numid used for fast search. |
|
* |
|
* It frees automatically the control which cannot be added. |
|
* |
|
* Return: Zero if successful, or a negative error code on failure. |
|
* |
|
*/ |
|
int snd_ctl_add(struct snd_card *card, struct snd_kcontrol *kcontrol) |
|
{ |
|
return snd_ctl_add_replace(card, kcontrol, CTL_ADD_EXCLUSIVE); |
|
} |
|
EXPORT_SYMBOL(snd_ctl_add); |
|
|
|
/** |
|
* snd_ctl_replace - replace the control instance of the card |
|
* @card: the card instance |
|
* @kcontrol: the control instance to replace |
|
* @add_on_replace: add the control if not already added |
|
* |
|
* Replaces the given control. If the given control does not exist |
|
* and the add_on_replace flag is set, the control is added. If the |
|
* control exists, it is destroyed first. |
|
* |
|
* 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. |
|
*/ |
|
int snd_ctl_replace(struct snd_card *card, struct snd_kcontrol *kcontrol, |
|
bool add_on_replace) |
|
{ |
|
return snd_ctl_add_replace(card, kcontrol, |
|
add_on_replace ? CTL_ADD_ON_REPLACE : CTL_REPLACE); |
|
} |
|
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; |
|
id = kcontrol->id; |
|
for (idx = 0; idx < kcontrol->count; idx++, id.index++, id.numid++) |
|
snd_ctl_notify(card, SNDRV_CTL_EVENT_MASK_REMOVE, &id); |
|
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); |
|
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; |
|
strscpy(info->id, card->id, sizeof(info->id)); |
|
strscpy(info->driver, card->driver, sizeof(info->driver)); |
|
strscpy(info->name, card->shortname, sizeof(info->name)); |
|
strscpy(info->longname, card->longname, sizeof(info->longname)); |
|
strscpy(info->mixername, card->mixername, sizeof(info->mixername)); |
|
strscpy(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 *list) |
|
{ |
|
struct snd_kcontrol *kctl; |
|
struct snd_ctl_elem_id id; |
|
unsigned int offset, space, jidx; |
|
int err = 0; |
|
|
|
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); |
|
return err; |
|
} |
|
|
|
static int snd_ctl_elem_list_user(struct snd_card *card, |
|
struct snd_ctl_elem_list __user *_list) |
|
{ |
|
struct snd_ctl_elem_list list; |
|
int err; |
|
|
|
if (copy_from_user(&list, _list, sizeof(list))) |
|
return -EFAULT; |
|
err = snd_ctl_elem_list(card, &list); |
|
if (err) |
|
return err; |
|
if (copy_to_user(_list, &list, sizeof(list))) |
|
return -EFAULT; |
|
|
|
return 0; |
|
} |
|
|
|
/* 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 = DIV_ROUND_UP(offset, 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 = DIV_ROUND_UP(offset, 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 err; |
|
} |
|
|
|
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_user(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_compat - 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; |
|
unsigned long flags; |
|
|
|
read_lock_irqsave(&card->ctl_files_rwlock, flags); |
|
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_irqrestore(&card->ctl_files_rwlock, flags); |
|
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; |
|
unsigned long flags; |
|
|
|
read_lock_irqsave(&card->ctl_files_rwlock, flags); |
|
list_for_each_entry(ctl, &card->ctl_files, list) { |
|
wake_up(&ctl->change_sleep); |
|
kill_fasync(&ctl->fasync, SIGIO, POLL_ERR); |
|
} |
|
read_unlock_irqrestore(&card->ctl_files_rwlock, flags); |
|
|
|
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]); |
|
strscpy(info->value.enumerated.name, |
|
names[info->value.enumerated.item], |
|
sizeof(info->value.enumerated.name)); |
|
return 0; |
|
} |
|
EXPORT_SYMBOL(snd_ctl_enum_info);
|
|
|