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sound/core/control.c
50.3 KB
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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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* * * This program is free software; you can redistribute it and/or modify * it under the terms of the GNU General Public License as published by * the Free Software Foundation; either version 2 of the License, or * (at your option) any later version. * * This program is distributed in the hope that it will be useful, * but WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the * GNU General Public License for more details. * * You should have received a copy of the GNU General Public License * along with this program; if not, write to the Free Software * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA * */ |
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#include <linux/threads.h> #include <linux/interrupt.h> |
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#include <linux/module.h> |
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#include <linux/slab.h> #include <linux/vmalloc.h> #include <linux/time.h> #include <sound/core.h> #include <sound/minors.h> #include <sound/info.h> #include <sound/control.h> /* max number of user-defined controls */ #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 */ snd_kctl_ioctl_func_t fioctl; |
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}; |
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static DECLARE_RWSEM(snd_ioctl_rwsem); static LIST_HEAD(snd_control_ioctls); #ifdef CONFIG_COMPAT static LIST_HEAD(snd_control_compat_ioctls); #endif static int snd_ctl_open(struct inode *inode, struct file *file) { |
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unsigned long flags; |
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struct snd_card *card; struct snd_ctl_file *ctl; |
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int i, err; |
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|
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err = nonseekable_open(inode, file); if (err < 0) return err; |
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card = snd_lookup_minor_data(iminor(inode), SNDRV_DEVICE_TYPE_CONTROL); |
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if (!card) { err = -ENODEV; goto __error1; } err = snd_card_file_add(card, file); if (err < 0) { err = -ENODEV; goto __error1; } if (!try_module_get(card->module)) { err = -EFAULT; goto __error2; } |
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ctl = kzalloc(sizeof(*ctl), GFP_KERNEL); |
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if (ctl == NULL) { err = -ENOMEM; goto __error; } INIT_LIST_HEAD(&ctl->events); init_waitqueue_head(&ctl->change_sleep); spin_lock_init(&ctl->read_lock); ctl->card = card; |
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for (i = 0; i < SND_CTL_SUBDEV_ITEMS; i++) ctl->preferred_subdevice[i] = -1; |
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ctl->pid = get_pid(task_pid(current)); |
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file->private_data = ctl; write_lock_irqsave(&card->ctl_files_rwlock, flags); list_add_tail(&ctl->list, &card->ctl_files); write_unlock_irqrestore(&card->ctl_files_rwlock, flags); |
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snd_card_unref(card); |
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return 0; __error: module_put(card->module); __error2: snd_card_file_remove(card, file); __error1: |
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if (card) snd_card_unref(card); |
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return err; } |
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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)) { cread = snd_kctl_event(ctl->events.next); list_del(&cread->list); kfree(cread); } |
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spin_unlock_irqrestore(&ctl->read_lock, flags); |
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} static int snd_ctl_release(struct inode *inode, struct file *file) { unsigned long flags; |
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struct snd_card *card; struct snd_ctl_file *ctl; struct snd_kcontrol *control; |
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unsigned int idx; ctl = file->private_data; |
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file->private_data = NULL; card = ctl->card; write_lock_irqsave(&card->ctl_files_rwlock, flags); list_del(&ctl->list); write_unlock_irqrestore(&card->ctl_files_rwlock, flags); 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++) if (control->vd[idx].owner == ctl) control->vd[idx].owner = NULL; |
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up_write(&card->controls_rwsem); snd_ctl_empty_read_queue(ctl); |
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put_pid(ctl->pid); |
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kfree(ctl); module_put(card->module); snd_card_file_remove(card, file); return 0; } |
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/** * snd_ctl_notify - Send notification to user-space for a control change * @card: the card to send notification * @mask: the event mask, SNDRV_CTL_EVENT_* * @id: the ctl element id to send notification * * This function adds an event record with the given id and mask, appends * to the list and wakes up the user-space for notification. This can be * called in the atomic context. */ |
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void snd_ctl_notify(struct snd_card *card, unsigned int mask, struct snd_ctl_elem_id *id) |
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{ unsigned long flags; |
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struct snd_ctl_file *ctl; struct snd_kctl_event *ev; |
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|
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if (snd_BUG_ON(!card || !id)) return; |
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if (card->shutdown) 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++; #endif |
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list_for_each_entry(ctl, &card->ctl_files, list) { |
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if (!ctl->subscribed) continue; 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) { ev->mask |= mask; goto _found; } } |
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ev = kzalloc(sizeof(*ev), GFP_ATOMIC); |
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if (ev) { ev->id = *id; ev->mask = mask; list_add_tail(&ev->list, &ctl->events); } else { |
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dev_err(card->dev, "No memory available to allocate event "); |
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} _found: wake_up(&ctl->change_sleep); spin_unlock_irqrestore(&ctl->read_lock, flags); kill_fasync(&ctl->fasync, SIGIO, POLL_IN); } read_unlock(&card->ctl_files_rwlock); } |
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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 * @kctl: the pointer to store new control instance * @count: the number of elements in this control * @access: the default access flags for elements in this control * @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 * elements as many as the given number (@count). Each element has given * 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, unsigned int access, struct snd_ctl_file *file) |
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{ |
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unsigned int size; |
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unsigned int idx; |
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if (count == 0 || count > MAX_CONTROL_COUNT) return -EINVAL; |
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|
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size = sizeof(struct snd_kcontrol); size += sizeof(struct snd_kcontrol_volatile) * count; |
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|
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*kctl = kzalloc(size, GFP_KERNEL); |
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if (!*kctl) |
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return -ENOMEM; |
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for (idx = 0; idx < count; idx++) { (*kctl)->vd[idx].access = access; (*kctl)->vd[idx].owner = file; } (*kctl)->count = count; return 0; |
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} /** * snd_ctl_new1 - create a control instance from the template * @ncontrol: the initialization record * @private_data: the private data to set * |
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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 * READWRITE access. When the count field is 0, it's assumes as one. * |
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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, void *private_data) |
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{ |
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struct snd_kcontrol *kctl; unsigned int count; |
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unsigned int access; |
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int err; |
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|
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if (snd_BUG_ON(!ncontrol || !ncontrol->info)) return NULL; |
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count = ncontrol->count; if (count == 0) count = 1; access = ncontrol->access; if (access == 0) access = SNDRV_CTL_ELEM_ACCESS_READWRITE; access &= (SNDRV_CTL_ELEM_ACCESS_READWRITE | SNDRV_CTL_ELEM_ACCESS_VOLATILE | SNDRV_CTL_ELEM_ACCESS_INACTIVE | SNDRV_CTL_ELEM_ACCESS_TLV_READWRITE | SNDRV_CTL_ELEM_ACCESS_TLV_COMMAND | SNDRV_CTL_ELEM_ACCESS_TLV_CALLBACK); err = snd_ctl_new(&kctl, count, access, NULL); if (err < 0) return NULL; /* The 'numid' member is decided when calling snd_ctl_add(). */ kctl->id.iface = ncontrol->iface; kctl->id.device = ncontrol->device; 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)); if (strcmp(ncontrol->name, kctl->id.name) != 0) |
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pr_warn("ALSA: Control name '%s' truncated to '%s' ", |
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ncontrol->name, kctl->id.name); |
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} |
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kctl->id.index = ncontrol->index; kctl->info = ncontrol->info; kctl->get = ncontrol->get; kctl->put = ncontrol->put; kctl->tlv.p = ncontrol->tlv.p; kctl->private_value = ncontrol->private_value; kctl->private_data = private_data; return kctl; |
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} |
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EXPORT_SYMBOL(snd_ctl_new1); |
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/** * snd_ctl_free_one - release the control instance * @kcontrol: the control instance * * Releases the control instance created via snd_ctl_new() * or snd_ctl_new1(). * Don't call this after the control was added to the card. */ |
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void snd_ctl_free_one(struct snd_kcontrol *kcontrol) |
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{ if (kcontrol) { if (kcontrol->private_free) kcontrol->private_free(kcontrol); kfree(kcontrol); } } |
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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, unsigned int count) |
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{ |
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struct snd_kcontrol *kctl; |
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|
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/* Make sure that the ids assigned to the control do not wrap around */ if (card->last_numid >= UINT_MAX - count) 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) { card->last_numid = kctl->id.numid + kctl->count - 1; return true; } |
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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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|
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while (snd_ctl_remove_numid_conflict(card, count)) { |
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if (--iter == 0) { /* this situation is very unlikely */ |
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dev_err(card->dev, "unable to allocate new control numid "); |
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return -ENOMEM; } |
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} return 0; } /** * 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. * |
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* It frees automatically the control which cannot be added. |
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* * Return: Zero if successful, or a negative error code on failure. * |
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*/ |
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int snd_ctl_add(struct snd_card *card, struct snd_kcontrol *kcontrol) |
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{ |
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struct snd_ctl_elem_id id; |
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unsigned int idx; |
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unsigned int count; |
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int err = -EINVAL; |
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|
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if (! kcontrol) |
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return err; |
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if (snd_BUG_ON(!card || !kcontrol->info)) goto error; |
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id = kcontrol->id; |
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if (id.index > UINT_MAX - kcontrol->count) goto error; |
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down_write(&card->controls_rwsem); if (snd_ctl_find_id(card, &id)) { up_write(&card->controls_rwsem); |
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dev_err(card->dev, "control %i:%i:%i:%s:%i is already present ", |
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id.iface, id.device, id.subdevice, id.name, id.index); |
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err = -EBUSY; goto error; |
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} if (snd_ctl_find_hole(card, kcontrol->count) < 0) { up_write(&card->controls_rwsem); |
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err = -ENOMEM; goto error; |
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} list_add_tail(&kcontrol->list, &card->controls); card->controls_count += kcontrol->count; kcontrol->id.numid = card->last_numid + 1; card->last_numid += kcontrol->count; |
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id = kcontrol->id; |
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count = kcontrol->count; |
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up_write(&card->controls_rwsem); |
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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; |
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error: snd_ctl_free_one(kcontrol); return err; |
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} |
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EXPORT_SYMBOL(snd_ctl_add); |
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/** |
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* 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. * |
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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, bool add_on_replace) { struct snd_ctl_elem_id id; |
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unsigned int count; |
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unsigned int idx; struct snd_kcontrol *old; int ret; if (!kcontrol) return -EINVAL; if (snd_BUG_ON(!card || !kcontrol->info)) { ret = -EINVAL; goto error; } id = kcontrol->id; down_write(&card->controls_rwsem); old = snd_ctl_find_id(card, &id); if (!old) { if (add_on_replace) goto add; up_write(&card->controls_rwsem); ret = -EINVAL; goto error; } ret = snd_ctl_remove(card, old); if (ret < 0) { up_write(&card->controls_rwsem); goto error; } add: if (snd_ctl_find_hole(card, kcontrol->count) < 0) { up_write(&card->controls_rwsem); ret = -ENOMEM; goto error; } list_add_tail(&kcontrol->list, &card->controls); card->controls_count += kcontrol->count; kcontrol->id.numid = card->last_numid + 1; card->last_numid += kcontrol->count; |
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id = kcontrol->id; |
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460 |
count = kcontrol->count; |
66b5b9722 ALSA: Add snd_ctl... |
461 |
up_write(&card->controls_rwsem); |
fd9f26e4e ALSA: control: Do... |
462 |
for (idx = 0; idx < count; idx++, id.index++, id.numid++) |
66b5b9722 ALSA: Add snd_ctl... |
463 464 465 466 467 468 469 470 471 472 |
snd_ctl_notify(card, SNDRV_CTL_EVENT_MASK_ADD, &id); return 0; error: snd_ctl_free_one(kcontrol); return ret; } EXPORT_SYMBOL(snd_ctl_replace); /** |
1da177e4c Linux-2.6.12-rc2 |
473 474 475 476 477 478 479 |
* 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). |
eb7c06e8e ALSA: add/change ... |
480 481 |
* * Return: 0 if successful, or a negative error code on failure. |
1da177e4c Linux-2.6.12-rc2 |
482 |
*/ |
82e9bae6f [ALSA] Remove xxx... |
483 |
int snd_ctl_remove(struct snd_card *card, struct snd_kcontrol *kcontrol) |
1da177e4c Linux-2.6.12-rc2 |
484 |
{ |
82e9bae6f [ALSA] Remove xxx... |
485 |
struct snd_ctl_elem_id id; |
1da177e4c Linux-2.6.12-rc2 |
486 |
unsigned int idx; |
7eaa943c8 ALSA: Kill snd_as... |
487 488 |
if (snd_BUG_ON(!card || !kcontrol)) return -EINVAL; |
1da177e4c Linux-2.6.12-rc2 |
489 490 491 492 493 494 495 496 |
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; } |
c0d3fb39e [ALSA] Clean up E... |
497 |
EXPORT_SYMBOL(snd_ctl_remove); |
1da177e4c Linux-2.6.12-rc2 |
498 499 500 501 502 503 504 |
/** * 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. |
eb7c06e8e ALSA: add/change ... |
505 506 |
* * Return: 0 if successful, or a negative error code on failure. |
1da177e4c Linux-2.6.12-rc2 |
507 |
*/ |
82e9bae6f [ALSA] Remove xxx... |
508 |
int snd_ctl_remove_id(struct snd_card *card, struct snd_ctl_elem_id *id) |
1da177e4c Linux-2.6.12-rc2 |
509 |
{ |
82e9bae6f [ALSA] Remove xxx... |
510 |
struct snd_kcontrol *kctl; |
1da177e4c Linux-2.6.12-rc2 |
511 512 513 514 515 516 517 518 519 520 521 522 |
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; } |
c0d3fb39e [ALSA] Clean up E... |
523 |
EXPORT_SYMBOL(snd_ctl_remove_id); |
1da177e4c Linux-2.6.12-rc2 |
524 |
/** |
f217ac59b sound: snd_ctl_re... |
525 |
* snd_ctl_remove_user_ctl - remove and release the unlocked user control |
1da177e4c Linux-2.6.12-rc2 |
526 527 528 529 530 |
* @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. |
eb7c06e8e ALSA: add/change ... |
531 532 |
* * Return: 0 if successful, or a negative error code on failure. |
1da177e4c Linux-2.6.12-rc2 |
533 |
*/ |
f217ac59b sound: snd_ctl_re... |
534 535 |
static int snd_ctl_remove_user_ctl(struct snd_ctl_file * file, struct snd_ctl_elem_id *id) |
1da177e4c Linux-2.6.12-rc2 |
536 |
{ |
82e9bae6f [ALSA] Remove xxx... |
537 538 |
struct snd_card *card = file->card; struct snd_kcontrol *kctl; |
1da177e4c Linux-2.6.12-rc2 |
539 540 541 542 543 |
int idx, ret; down_write(&card->controls_rwsem); kctl = snd_ctl_find_id(card, id); if (kctl == NULL) { |
317b80817 sound: snd_ctl_re... |
544 545 |
ret = -ENOENT; goto error; |
1da177e4c Linux-2.6.12-rc2 |
546 |
} |
18dd0aa5a sound: snd_ctl_re... |
547 548 549 550 |
if (!(kctl->vd[0].access & SNDRV_CTL_ELEM_ACCESS_USER)) { ret = -EINVAL; goto error; } |
1da177e4c Linux-2.6.12-rc2 |
551 552 |
for (idx = 0; idx < kctl->count; idx++) if (kctl->vd[idx].owner != NULL && kctl->vd[idx].owner != file) { |
317b80817 sound: snd_ctl_re... |
553 554 |
ret = -EBUSY; goto error; |
1da177e4c Linux-2.6.12-rc2 |
555 556 |
} ret = snd_ctl_remove(card, kctl); |
f217ac59b sound: snd_ctl_re... |
557 558 559 |
if (ret < 0) goto error; card->user_ctl_count--; |
317b80817 sound: snd_ctl_re... |
560 |
error: |
1da177e4c Linux-2.6.12-rc2 |
561 562 563 564 565 |
up_write(&card->controls_rwsem); return ret; } /** |
3cbdd7533 ALSA: Add snd_ctl... |
566 567 568 569 570 571 572 |
* 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. |
c78497e01 ALSA: ctl: confir... |
573 |
* The given ID data is filled with full information. |
3cbdd7533 ALSA: Add snd_ctl... |
574 |
* |
eb7c06e8e ALSA: add/change ... |
575 |
* Return: 0 if unchanged, 1 if changed, or a negative error code on failure. |
3cbdd7533 ALSA: Add snd_ctl... |
576 577 578 579 580 581 582 583 584 585 586 587 588 589 590 |
*/ 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; } |
31584ed18 ALSA: snd_ctl_act... |
591 |
index_offset = snd_ctl_get_ioff(kctl, id); |
3cbdd7533 ALSA: Add snd_ctl... |
592 593 594 595 596 597 598 599 600 601 602 |
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; } |
c78497e01 ALSA: ctl: confir... |
603 |
snd_ctl_build_ioff(id, kctl, index_offset); |
3cbdd7533 ALSA: Add snd_ctl... |
604 605 606 607 608 609 610 611 612 613 |
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); /** |
1da177e4c Linux-2.6.12-rc2 |
614 615 616 617 618 619 620 621 |
* 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. * |
eb7c06e8e ALSA: add/change ... |
622 |
* Return: Zero if successful, or a negative error code on failure. |
1da177e4c Linux-2.6.12-rc2 |
623 |
*/ |
82e9bae6f [ALSA] Remove xxx... |
624 625 |
int snd_ctl_rename_id(struct snd_card *card, struct snd_ctl_elem_id *src_id, struct snd_ctl_elem_id *dst_id) |
1da177e4c Linux-2.6.12-rc2 |
626 |
{ |
82e9bae6f [ALSA] Remove xxx... |
627 |
struct snd_kcontrol *kctl; |
1da177e4c Linux-2.6.12-rc2 |
628 629 630 631 632 633 634 635 636 637 638 639 640 |
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; } |
c0d3fb39e [ALSA] Clean up E... |
641 |
EXPORT_SYMBOL(snd_ctl_rename_id); |
1da177e4c Linux-2.6.12-rc2 |
642 643 644 645 646 647 648 |
/** * 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. * |
1da177e4c Linux-2.6.12-rc2 |
649 650 |
* The caller must down card->controls_rwsem before calling this function * (if the race condition can happen). |
eb7c06e8e ALSA: add/change ... |
651 652 653 |
* * Return: The pointer of the instance if found, or %NULL if not. * |
1da177e4c Linux-2.6.12-rc2 |
654 |
*/ |
82e9bae6f [ALSA] Remove xxx... |
655 |
struct snd_kcontrol *snd_ctl_find_numid(struct snd_card *card, unsigned int numid) |
1da177e4c Linux-2.6.12-rc2 |
656 |
{ |
82e9bae6f [ALSA] Remove xxx... |
657 |
struct snd_kcontrol *kctl; |
1da177e4c Linux-2.6.12-rc2 |
658 |
|
7eaa943c8 ALSA: Kill snd_as... |
659 660 |
if (snd_BUG_ON(!card || !numid)) return NULL; |
9244b2c30 [ALSA] alsa core:... |
661 |
list_for_each_entry(kctl, &card->controls, list) { |
1da177e4c Linux-2.6.12-rc2 |
662 663 664 665 666 |
if (kctl->id.numid <= numid && kctl->id.numid + kctl->count > numid) return kctl; } return NULL; } |
c0d3fb39e [ALSA] Clean up E... |
667 |
EXPORT_SYMBOL(snd_ctl_find_numid); |
1da177e4c Linux-2.6.12-rc2 |
668 669 670 671 672 673 674 |
/** * 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. * |
1da177e4c Linux-2.6.12-rc2 |
675 676 |
* The caller must down card->controls_rwsem before calling this function * (if the race condition can happen). |
eb7c06e8e ALSA: add/change ... |
677 678 679 |
* * Return: The pointer of the instance if found, or %NULL if not. * |
1da177e4c Linux-2.6.12-rc2 |
680 |
*/ |
82e9bae6f [ALSA] Remove xxx... |
681 682 |
struct snd_kcontrol *snd_ctl_find_id(struct snd_card *card, struct snd_ctl_elem_id *id) |
1da177e4c Linux-2.6.12-rc2 |
683 |
{ |
82e9bae6f [ALSA] Remove xxx... |
684 |
struct snd_kcontrol *kctl; |
1da177e4c Linux-2.6.12-rc2 |
685 |
|
7eaa943c8 ALSA: Kill snd_as... |
686 687 |
if (snd_BUG_ON(!card || !id)) return NULL; |
1da177e4c Linux-2.6.12-rc2 |
688 689 |
if (id->numid != 0) return snd_ctl_find_numid(card, id->numid); |
9244b2c30 [ALSA] alsa core:... |
690 |
list_for_each_entry(kctl, &card->controls, list) { |
1da177e4c Linux-2.6.12-rc2 |
691 692 693 694 695 696 697 698 699 700 701 702 703 704 705 706 |
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; } |
c0d3fb39e [ALSA] Clean up E... |
707 |
EXPORT_SYMBOL(snd_ctl_find_id); |
82e9bae6f [ALSA] Remove xxx... |
708 |
static int snd_ctl_card_info(struct snd_card *card, struct snd_ctl_file * ctl, |
1da177e4c Linux-2.6.12-rc2 |
709 710 |
unsigned int cmd, void __user *arg) { |
82e9bae6f [ALSA] Remove xxx... |
711 |
struct snd_ctl_card_info *info; |
1da177e4c Linux-2.6.12-rc2 |
712 |
|
ca2c09665 [ALSA] Replace wi... |
713 |
info = kzalloc(sizeof(*info), GFP_KERNEL); |
1da177e4c Linux-2.6.12-rc2 |
714 715 716 717 718 719 720 721 722 723 724 |
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); |
82e9bae6f [ALSA] Remove xxx... |
725 |
if (copy_to_user(arg, info, sizeof(struct snd_ctl_card_info))) { |
1da177e4c Linux-2.6.12-rc2 |
726 727 728 729 730 731 |
kfree(info); return -EFAULT; } kfree(info); return 0; } |
82e9bae6f [ALSA] Remove xxx... |
732 733 |
static int snd_ctl_elem_list(struct snd_card *card, struct snd_ctl_elem_list __user *_list) |
1da177e4c Linux-2.6.12-rc2 |
734 735 |
{ struct list_head *plist; |
82e9bae6f [ALSA] Remove xxx... |
736 737 738 |
struct snd_ctl_elem_list list; struct snd_kcontrol *kctl; struct snd_ctl_elem_id *dst, *id; |
78fa2c4d2 ALSA: core: remov... |
739 |
unsigned int offset, space, jidx; |
1da177e4c Linux-2.6.12-rc2 |
740 741 742 743 744 |
if (copy_from_user(&list, _list, sizeof(list))) return -EFAULT; offset = list.offset; space = list.space; |
1da177e4c Linux-2.6.12-rc2 |
745 746 747 748 749 |
/* try limit maximum space */ if (space > 16384) return -ENOMEM; if (space > 0) { /* allocate temporary buffer for atomic operation */ |
82e9bae6f [ALSA] Remove xxx... |
750 |
dst = vmalloc(space * sizeof(struct snd_ctl_elem_id)); |
1da177e4c Linux-2.6.12-rc2 |
751 752 753 754 755 756 757 758 759 760 761 762 763 764 765 766 767 768 769 770 771 772 773 774 775 776 777 778 |
if (dst == NULL) return -ENOMEM; down_read(&card->controls_rwsem); list.count = card->controls_count; plist = card->controls.next; while (plist != &card->controls) { if (offset == 0) break; kctl = snd_kcontrol(plist); if (offset < kctl->count) break; offset -= kctl->count; plist = plist->next; } list.used = 0; id = dst; while (space > 0 && plist != &card->controls) { kctl = snd_kcontrol(plist); for (jidx = offset; space > 0 && jidx < kctl->count; jidx++) { snd_ctl_build_ioff(id, kctl, jidx); id++; space--; list.used++; } plist = plist->next; offset = 0; } up_read(&card->controls_rwsem); |
82e9bae6f [ALSA] Remove xxx... |
779 780 781 |
if (list.used > 0 && copy_to_user(list.pids, dst, list.used * sizeof(struct snd_ctl_elem_id))) { |
1da177e4c Linux-2.6.12-rc2 |
782 783 784 785 786 787 788 789 790 791 792 793 794 |
vfree(dst); return -EFAULT; } vfree(dst); } else { down_read(&card->controls_rwsem); list.count = card->controls_count; up_read(&card->controls_rwsem); } if (copy_to_user(_list, &list, sizeof(list))) return -EFAULT; return 0; } |
860c1994a ALSA: control: ad... |
795 796 797 798 799 800 801 802 803 804 805 806 807 808 809 810 811 812 813 814 815 816 817 818 819 820 821 822 823 |
static bool validate_element_member_dimension(struct snd_ctl_elem_info *info) { unsigned int members; unsigned int i; if (info->dimen.d[0] == 0) return true; members = 1; for (i = 0; i < ARRAY_SIZE(info->dimen.d); ++i) { if (info->dimen.d[i] == 0) break; members *= info->dimen.d[i]; /* * info->count should be validated in advance, to guarantee * calculation soundness. */ if (members > info->count) return false; } for (++i; i < ARRAY_SIZE(info->dimen.d); ++i) { if (info->dimen.d[i] > 0) return false; } return members == info->count; } |
82e9bae6f [ALSA] Remove xxx... |
824 825 |
static int snd_ctl_elem_info(struct snd_ctl_file *ctl, struct snd_ctl_elem_info *info) |
1da177e4c Linux-2.6.12-rc2 |
826 |
{ |
82e9bae6f [ALSA] Remove xxx... |
827 828 829 |
struct snd_card *card = ctl->card; struct snd_kcontrol *kctl; struct snd_kcontrol_volatile *vd; |
1da177e4c Linux-2.6.12-rc2 |
830 831 832 833 834 835 836 837 838 839 840 841 842 843 |
unsigned int index_offset; int result; down_read(&card->controls_rwsem); kctl = snd_ctl_find_id(card, &info->id); if (kctl == NULL) { up_read(&card->controls_rwsem); return -ENOENT; } #ifdef CONFIG_SND_DEBUG info->access = 0; #endif result = kctl->info(kctl, info); if (result >= 0) { |
7eaa943c8 ALSA: Kill snd_as... |
844 |
snd_BUG_ON(info->access); |
1da177e4c Linux-2.6.12-rc2 |
845 846 847 848 849 850 851 852 |
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; |
25d27eded control: use refe... |
853 |
info->owner = pid_vnr(vd->owner->pid); |
1da177e4c Linux-2.6.12-rc2 |
854 855 856 857 858 859 860 |
} else { info->owner = -1; } } up_read(&card->controls_rwsem); return result; } |
82e9bae6f [ALSA] Remove xxx... |
861 862 |
static int snd_ctl_elem_info_user(struct snd_ctl_file *ctl, struct snd_ctl_elem_info __user *_info) |
1da177e4c Linux-2.6.12-rc2 |
863 |
{ |
82e9bae6f [ALSA] Remove xxx... |
864 |
struct snd_ctl_elem_info info; |
1da177e4c Linux-2.6.12-rc2 |
865 866 867 868 |
int result; if (copy_from_user(&info, _info, sizeof(info))) return -EFAULT; |
646494007 [ALSA] make contr... |
869 |
snd_power_lock(ctl->card); |
cbac4b0cb [ALSA] Cleanup un... |
870 |
result = snd_power_wait(ctl->card, SNDRV_CTL_POWER_D0); |
646494007 [ALSA] make contr... |
871 872 873 |
if (result >= 0) result = snd_ctl_elem_info(ctl, &info); snd_power_unlock(ctl->card); |
1da177e4c Linux-2.6.12-rc2 |
874 875 876 877 878 |
if (result >= 0) if (copy_to_user(_info, &info, sizeof(info))) return -EFAULT; return result; } |
d3bd67cdb ALSA: make snd_ct... |
879 880 |
static int snd_ctl_elem_read(struct snd_card *card, struct snd_ctl_elem_value *control) |
1da177e4c Linux-2.6.12-rc2 |
881 |
{ |
82e9bae6f [ALSA] Remove xxx... |
882 883 |
struct snd_kcontrol *kctl; struct snd_kcontrol_volatile *vd; |
1da177e4c Linux-2.6.12-rc2 |
884 |
unsigned int index_offset; |
8ace4f3c9 [ALSA] Remove ind... |
885 |
int result; |
1da177e4c Linux-2.6.12-rc2 |
886 887 888 889 890 891 892 893 |
down_read(&card->controls_rwsem); kctl = snd_ctl_find_id(card, &control->id); if (kctl == NULL) { result = -ENOENT; } else { index_offset = snd_ctl_get_ioff(kctl, &control->id); vd = &kctl->vd[index_offset]; |
8ace4f3c9 [ALSA] Remove ind... |
894 895 896 897 898 899 |
if ((vd->access & SNDRV_CTL_ELEM_ACCESS_READ) && kctl->get != NULL) { snd_ctl_build_ioff(&control->id, kctl, index_offset); result = kctl->get(kctl, control); } else result = -EPERM; |
1da177e4c Linux-2.6.12-rc2 |
900 901 902 903 |
} up_read(&card->controls_rwsem); return result; } |
82e9bae6f [ALSA] Remove xxx... |
904 905 |
static int snd_ctl_elem_read_user(struct snd_card *card, struct snd_ctl_elem_value __user *_control) |
1da177e4c Linux-2.6.12-rc2 |
906 |
{ |
82e9bae6f [ALSA] Remove xxx... |
907 |
struct snd_ctl_elem_value *control; |
1da177e4c Linux-2.6.12-rc2 |
908 |
int result; |
ef44a1ec6 ALSA: sound/core:... |
909 910 911 912 |
control = memdup_user(_control, sizeof(*control)); if (IS_ERR(control)) return PTR_ERR(control); |
646494007 [ALSA] make contr... |
913 |
snd_power_lock(card); |
cbac4b0cb [ALSA] Cleanup un... |
914 |
result = snd_power_wait(card, SNDRV_CTL_POWER_D0); |
646494007 [ALSA] make contr... |
915 916 917 |
if (result >= 0) result = snd_ctl_elem_read(card, control); snd_power_unlock(card); |
1da177e4c Linux-2.6.12-rc2 |
918 919 920 921 922 923 |
if (result >= 0) if (copy_to_user(_control, control, sizeof(*control))) result = -EFAULT; kfree(control); return result; } |
d3bd67cdb ALSA: make snd_ct... |
924 925 |
static int snd_ctl_elem_write(struct snd_card *card, struct snd_ctl_file *file, struct snd_ctl_elem_value *control) |
1da177e4c Linux-2.6.12-rc2 |
926 |
{ |
82e9bae6f [ALSA] Remove xxx... |
927 928 |
struct snd_kcontrol *kctl; struct snd_kcontrol_volatile *vd; |
1da177e4c Linux-2.6.12-rc2 |
929 |
unsigned int index_offset; |
8ace4f3c9 [ALSA] Remove ind... |
930 |
int result; |
1da177e4c Linux-2.6.12-rc2 |
931 932 933 934 935 936 937 938 |
down_read(&card->controls_rwsem); kctl = snd_ctl_find_id(card, &control->id); if (kctl == NULL) { result = -ENOENT; } else { index_offset = snd_ctl_get_ioff(kctl, &control->id); vd = &kctl->vd[index_offset]; |
8ace4f3c9 [ALSA] Remove ind... |
939 940 941 942 |
if (!(vd->access & SNDRV_CTL_ELEM_ACCESS_WRITE) || kctl->put == NULL || (file && vd->owner && vd->owner != file)) { result = -EPERM; |
1da177e4c Linux-2.6.12-rc2 |
943 |
} else { |
8ace4f3c9 [ALSA] Remove ind... |
944 945 946 947 |
snd_ctl_build_ioff(&control->id, kctl, index_offset); result = kctl->put(kctl, control); } if (result > 0) { |
fd9f26e4e ALSA: control: Do... |
948 |
struct snd_ctl_elem_id id = control->id; |
8ace4f3c9 [ALSA] Remove ind... |
949 |
up_read(&card->controls_rwsem); |
fd9f26e4e ALSA: control: Do... |
950 |
snd_ctl_notify(card, SNDRV_CTL_EVENT_MASK_VALUE, &id); |
8ace4f3c9 [ALSA] Remove ind... |
951 |
return 0; |
1da177e4c Linux-2.6.12-rc2 |
952 953 954 955 956 |
} } up_read(&card->controls_rwsem); return result; } |
82e9bae6f [ALSA] Remove xxx... |
957 958 |
static int snd_ctl_elem_write_user(struct snd_ctl_file *file, struct snd_ctl_elem_value __user *_control) |
1da177e4c Linux-2.6.12-rc2 |
959 |
{ |
82e9bae6f [ALSA] Remove xxx... |
960 |
struct snd_ctl_elem_value *control; |
646494007 [ALSA] make contr... |
961 |
struct snd_card *card; |
1da177e4c Linux-2.6.12-rc2 |
962 |
int result; |
ef44a1ec6 ALSA: sound/core:... |
963 964 965 |
control = memdup_user(_control, sizeof(*control)); if (IS_ERR(control)) return PTR_ERR(control); |
646494007 [ALSA] make contr... |
966 967 |
card = file->card; snd_power_lock(card); |
cbac4b0cb [ALSA] Cleanup un... |
968 |
result = snd_power_wait(card, SNDRV_CTL_POWER_D0); |
646494007 [ALSA] make contr... |
969 970 971 |
if (result >= 0) result = snd_ctl_elem_write(card, file, control); snd_power_unlock(card); |
1da177e4c Linux-2.6.12-rc2 |
972 973 974 975 976 977 |
if (result >= 0) if (copy_to_user(_control, control, sizeof(*control))) result = -EFAULT; kfree(control); return result; } |
82e9bae6f [ALSA] Remove xxx... |
978 979 |
static int snd_ctl_elem_lock(struct snd_ctl_file *file, struct snd_ctl_elem_id __user *_id) |
1da177e4c Linux-2.6.12-rc2 |
980 |
{ |
82e9bae6f [ALSA] Remove xxx... |
981 982 983 984 |
struct snd_card *card = file->card; struct snd_ctl_elem_id id; struct snd_kcontrol *kctl; struct snd_kcontrol_volatile *vd; |
1da177e4c Linux-2.6.12-rc2 |
985 986 987 988 989 990 991 992 993 994 995 996 997 998 |
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; |
1da177e4c Linux-2.6.12-rc2 |
999 1000 1001 1002 1003 1004 |
result = 0; } } up_write(&card->controls_rwsem); return result; } |
82e9bae6f [ALSA] Remove xxx... |
1005 1006 |
static int snd_ctl_elem_unlock(struct snd_ctl_file *file, struct snd_ctl_elem_id __user *_id) |
1da177e4c Linux-2.6.12-rc2 |
1007 |
{ |
82e9bae6f [ALSA] Remove xxx... |
1008 1009 1010 1011 |
struct snd_card *card = file->card; struct snd_ctl_elem_id id; struct snd_kcontrol *kctl; struct snd_kcontrol_volatile *vd; |
1da177e4c Linux-2.6.12-rc2 |
1012 1013 1014 1015 1016 1017 1018 1019 1020 1021 1022 1023 1024 1025 1026 1027 |
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; |
1da177e4c Linux-2.6.12-rc2 |
1028 1029 1030 1031 1032 1033 1034 1035 |
result = 0; } } up_write(&card->controls_rwsem); return result; } struct user_element { |
82e9bae6f [ALSA] Remove xxx... |
1036 |
struct snd_ctl_elem_info info; |
07f4d9d74 ALSA: control: Pr... |
1037 |
struct snd_card *card; |
e1c78df1d ALSA: ctl: fix to... |
1038 |
char *elem_data; /* element data */ |
1da177e4c Linux-2.6.12-rc2 |
1039 |
unsigned long elem_data_size; /* size of element data in bytes */ |
8aa9b586e [ALSA] Control AP... |
1040 1041 |
void *tlv_data; /* TLV data */ unsigned long tlv_data_size; /* TLV data size */ |
1da177e4c Linux-2.6.12-rc2 |
1042 |
void *priv_data; /* private data (like strings for enumerated type) */ |
1da177e4c Linux-2.6.12-rc2 |
1043 |
}; |
82e9bae6f [ALSA] Remove xxx... |
1044 1045 |
static int snd_ctl_elem_user_info(struct snd_kcontrol *kcontrol, struct snd_ctl_elem_info *uinfo) |
1da177e4c Linux-2.6.12-rc2 |
1046 1047 |
{ struct user_element *ue = kcontrol->private_data; |
c378c3b03 ALSA: ctl: fix a ... |
1048 |
unsigned int offset; |
1da177e4c Linux-2.6.12-rc2 |
1049 |
|
c378c3b03 ALSA: ctl: fix a ... |
1050 |
offset = snd_ctl_get_ioff(kcontrol, &uinfo->id); |
1da177e4c Linux-2.6.12-rc2 |
1051 |
*uinfo = ue->info; |
c378c3b03 ALSA: ctl: fix a ... |
1052 |
snd_ctl_build_ioff(&uinfo->id, kcontrol, offset); |
1da177e4c Linux-2.6.12-rc2 |
1053 1054 |
return 0; } |
8d448162b ALSA: control: ad... |
1055 1056 1057 1058 1059 1060 |
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; |
c378c3b03 ALSA: ctl: fix a ... |
1061 |
unsigned int offset; |
8d448162b ALSA: control: ad... |
1062 1063 |
item = uinfo->value.enumerated.item; |
c378c3b03 ALSA: ctl: fix a ... |
1064 |
offset = snd_ctl_get_ioff(kcontrol, &uinfo->id); |
8d448162b ALSA: control: ad... |
1065 |
*uinfo = ue->info; |
c378c3b03 ALSA: ctl: fix a ... |
1066 |
snd_ctl_build_ioff(&uinfo->id, kcontrol, offset); |
8d448162b ALSA: control: ad... |
1067 1068 1069 1070 1071 1072 1073 1074 1075 1076 1077 |
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; } |
82e9bae6f [ALSA] Remove xxx... |
1078 1079 |
static int snd_ctl_elem_user_get(struct snd_kcontrol *kcontrol, struct snd_ctl_elem_value *ucontrol) |
1da177e4c Linux-2.6.12-rc2 |
1080 1081 |
{ struct user_element *ue = kcontrol->private_data; |
e1c78df1d ALSA: ctl: fix to... |
1082 1083 1084 |
unsigned int size = ue->elem_data_size; char *src = ue->elem_data + snd_ctl_get_ioff(kcontrol, &ucontrol->id) * size; |
1da177e4c Linux-2.6.12-rc2 |
1085 |
|
07f4d9d74 ALSA: control: Pr... |
1086 |
mutex_lock(&ue->card->user_ctl_lock); |
e1c78df1d ALSA: ctl: fix to... |
1087 |
memcpy(&ucontrol->value, src, size); |
07f4d9d74 ALSA: control: Pr... |
1088 |
mutex_unlock(&ue->card->user_ctl_lock); |
1da177e4c Linux-2.6.12-rc2 |
1089 1090 |
return 0; } |
82e9bae6f [ALSA] Remove xxx... |
1091 1092 |
static int snd_ctl_elem_user_put(struct snd_kcontrol *kcontrol, struct snd_ctl_elem_value *ucontrol) |
1da177e4c Linux-2.6.12-rc2 |
1093 1094 1095 |
{ int change; struct user_element *ue = kcontrol->private_data; |
e1c78df1d ALSA: ctl: fix to... |
1096 1097 1098 |
unsigned int size = ue->elem_data_size; char *dst = ue->elem_data + snd_ctl_get_ioff(kcontrol, &ucontrol->id) * size; |
07f4d9d74 ALSA: control: Pr... |
1099 1100 |
mutex_lock(&ue->card->user_ctl_lock); |
e1c78df1d ALSA: ctl: fix to... |
1101 |
change = memcmp(&ucontrol->value, dst, size) != 0; |
1da177e4c Linux-2.6.12-rc2 |
1102 |
if (change) |
e1c78df1d ALSA: ctl: fix to... |
1103 |
memcpy(dst, &ucontrol->value, size); |
07f4d9d74 ALSA: control: Pr... |
1104 |
mutex_unlock(&ue->card->user_ctl_lock); |
1da177e4c Linux-2.6.12-rc2 |
1105 1106 |
return change; } |
8aa9b586e [ALSA] Control AP... |
1107 1108 1109 1110 1111 1112 1113 1114 |
static int snd_ctl_elem_user_tlv(struct snd_kcontrol *kcontrol, int op_flag, unsigned int size, unsigned int __user *tlv) { struct user_element *ue = kcontrol->private_data; int change = 0; void *new_data; |
39d118677 ALSA: ctl: evalua... |
1115 |
if (op_flag == SNDRV_CTL_TLV_OP_WRITE) { |
8aa9b586e [ALSA] Control AP... |
1116 1117 |
if (size > 1024 * 128) /* sane value */ return -EINVAL; |
ef44a1ec6 ALSA: sound/core:... |
1118 1119 1120 1121 |
new_data = memdup_user(tlv, size); if (IS_ERR(new_data)) return PTR_ERR(new_data); |
07f4d9d74 ALSA: control: Pr... |
1122 |
mutex_lock(&ue->card->user_ctl_lock); |
8aa9b586e [ALSA] Control AP... |
1123 1124 1125 1126 1127 1128 |
change = ue->tlv_data_size != size; if (!change) change = memcmp(ue->tlv_data, new_data, size); kfree(ue->tlv_data); ue->tlv_data = new_data; ue->tlv_data_size = size; |
07f4d9d74 ALSA: control: Pr... |
1129 |
mutex_unlock(&ue->card->user_ctl_lock); |
8aa9b586e [ALSA] Control AP... |
1130 |
} else { |
07f4d9d74 ALSA: control: Pr... |
1131 1132 1133 1134 1135 1136 1137 1138 1139 1140 1141 |
int ret = 0; mutex_lock(&ue->card->user_ctl_lock); if (!ue->tlv_data_size || !ue->tlv_data) { ret = -ENXIO; goto err_unlock; } if (size < ue->tlv_data_size) { ret = -ENOSPC; goto err_unlock; } |
8aa9b586e [ALSA] Control AP... |
1142 |
if (copy_to_user(tlv, ue->tlv_data, ue->tlv_data_size)) |
07f4d9d74 ALSA: control: Pr... |
1143 1144 1145 1146 1147 |
ret = -EFAULT; err_unlock: mutex_unlock(&ue->card->user_ctl_lock); if (ret) return ret; |
8aa9b586e [ALSA] Control AP... |
1148 1149 1150 |
} return change; } |
8d448162b ALSA: control: ad... |
1151 1152 1153 1154 1155 |
static int snd_ctl_elem_init_enum_names(struct user_element *ue) { char *names, *p; size_t buf_len, name_len; unsigned int i; |
447c6f93a ALSA: control: re... |
1156 |
const uintptr_t user_ptrval = ue->info.value.enumerated.names_ptr; |
8d448162b ALSA: control: ad... |
1157 1158 1159 |
if (ue->info.value.enumerated.names_length > 64 * 1024) return -EINVAL; |
447c6f93a ALSA: control: re... |
1160 |
names = memdup_user((const void __user *)user_ptrval, |
8d448162b ALSA: control: ad... |
1161 1162 1163 1164 1165 1166 1167 1168 1169 1170 1171 1172 1173 1174 1175 1176 1177 1178 1179 1180 1181 1182 |
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) { kfree(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; } |
82e9bae6f [ALSA] Remove xxx... |
1183 |
static void snd_ctl_elem_user_free(struct snd_kcontrol *kcontrol) |
1da177e4c Linux-2.6.12-rc2 |
1184 |
{ |
8aa9b586e [ALSA] Control AP... |
1185 |
struct user_element *ue = kcontrol->private_data; |
8d448162b ALSA: control: ad... |
1186 1187 1188 |
kfree(ue->tlv_data); kfree(ue->priv_data); |
8aa9b586e [ALSA] Control AP... |
1189 |
kfree(ue); |
1da177e4c Linux-2.6.12-rc2 |
1190 |
} |
82e9bae6f [ALSA] Remove xxx... |
1191 1192 |
static int snd_ctl_elem_add(struct snd_ctl_file *file, struct snd_ctl_elem_info *info, int replace) |
1da177e4c Linux-2.6.12-rc2 |
1193 |
{ |
4ed56666b ALSA: core: use p... |
1194 1195 1196 1197 1198 1199 1200 1201 1202 1203 1204 1205 1206 1207 1208 1209 1210 |
/* 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), }; 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, }; |
82e9bae6f [ALSA] Remove xxx... |
1211 |
struct snd_card *card = file->card; |
2225e79b9 ALSA: core: reduc... |
1212 1213 |
struct snd_kcontrol *kctl; unsigned int count; |
1da177e4c Linux-2.6.12-rc2 |
1214 1215 1216 |
unsigned int access; long private_size; struct user_element *ue; |
cab2ed747 ALSA: ctl: fill i... |
1217 |
unsigned int offset; |
2225e79b9 ALSA: core: reduc... |
1218 |
int err; |
82262a466 ALSA: control: Fi... |
1219 |
|
be3bb8236 ALSA: control: Ad... |
1220 1221 1222 1223 |
if (!*info->id.name) return -EINVAL; if (strnlen(info->id.name, sizeof(info->id.name)) >= sizeof(info->id.name)) return -EINVAL; |
82262a466 ALSA: control: Fi... |
1224 |
|
2225e79b9 ALSA: core: reduc... |
1225 |
/* Delete a control to replace them if needed. */ |
82262a466 ALSA: control: Fi... |
1226 |
if (replace) { |
2225e79b9 ALSA: core: reduc... |
1227 |
info->id.numid = 0; |
82262a466 ALSA: control: Fi... |
1228 1229 1230 |
err = snd_ctl_remove_user_ctl(file, &info->id); if (err) return err; |
1da177e4c Linux-2.6.12-rc2 |
1231 |
} |
82262a466 ALSA: control: Fi... |
1232 |
|
2225e79b9 ALSA: core: reduc... |
1233 1234 1235 1236 1237 |
/* * The number of userspace controls are counted control by control, * not element by element. */ if (card->user_ctl_count + 1 > MAX_USER_CONTROLS) |
82262a466 ALSA: control: Fi... |
1238 |
return -ENOMEM; |
2225e79b9 ALSA: core: reduc... |
1239 1240 1241 1242 1243 1244 1245 1246 1247 1248 1249 1250 1251 |
/* 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_READWRITE); if (access & SNDRV_CTL_ELEM_ACCESS_TLV_READWRITE) |
8aa9b586e [ALSA] Control AP... |
1252 |
access |= SNDRV_CTL_ELEM_ACCESS_TLV_CALLBACK; |
2225e79b9 ALSA: core: reduc... |
1253 |
access |= SNDRV_CTL_ELEM_ACCESS_USER; |
4ed56666b ALSA: core: use p... |
1254 |
|
2225e79b9 ALSA: core: reduc... |
1255 1256 1257 1258 |
/* * Check information and calculate the size of data specific to * this userspace control. */ |
4ed56666b ALSA: core: use p... |
1259 1260 |
if (info->type < SNDRV_CTL_ELEM_TYPE_BOOLEAN || info->type > SNDRV_CTL_ELEM_TYPE_INTEGER64) |
1da177e4c Linux-2.6.12-rc2 |
1261 |
return -EINVAL; |
4ed56666b ALSA: core: use p... |
1262 1263 1264 1265 1266 1267 |
if (info->type == SNDRV_CTL_ELEM_TYPE_ENUMERATED && info->value.enumerated.items == 0) return -EINVAL; if (info->count < 1 || info->count > max_value_counts[info->type]) return -EINVAL; |
860c1994a ALSA: control: ad... |
1268 1269 |
if (!validate_element_member_dimension(info)) return -EINVAL; |
4ed56666b ALSA: core: use p... |
1270 |
private_size = value_sizes[info->type] * info->count; |
2225e79b9 ALSA: core: reduc... |
1271 1272 1273 1274 1275 1276 1277 1278 1279 1280 |
/* * 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; |
e79d74ab2 ALSA: control: Fi... |
1281 |
memcpy(&kctl->id, &info->id, sizeof(kctl->id)); |
e1c78df1d ALSA: ctl: fix to... |
1282 |
kctl->private_data = kzalloc(sizeof(struct user_element) + private_size * count, |
2225e79b9 ALSA: core: reduc... |
1283 1284 1285 |
GFP_KERNEL); if (kctl->private_data == NULL) { kfree(kctl); |
1da177e4c Linux-2.6.12-rc2 |
1286 |
return -ENOMEM; |
2225e79b9 ALSA: core: reduc... |
1287 1288 1289 1290 1291 |
} kctl->private_free = snd_ctl_elem_user_free; /* Set private data for this userspace control. */ ue = (struct user_element *)kctl->private_data; |
07f4d9d74 ALSA: control: Pr... |
1292 |
ue->card = card; |
1da177e4c Linux-2.6.12-rc2 |
1293 |
ue->info = *info; |
86148e84c [ALSA] Fix errors... |
1294 |
ue->info.access = 0; |
1da177e4c Linux-2.6.12-rc2 |
1295 1296 |
ue->elem_data = (char *)ue + sizeof(*ue); ue->elem_data_size = private_size; |
8d448162b ALSA: control: ad... |
1297 1298 1299 |
if (ue->info.type == SNDRV_CTL_ELEM_TYPE_ENUMERATED) { err = snd_ctl_elem_init_enum_names(ue); if (err < 0) { |
2225e79b9 ALSA: core: reduc... |
1300 |
snd_ctl_free_one(kctl); |
8d448162b ALSA: control: ad... |
1301 1302 1303 |
return err; } } |
2225e79b9 ALSA: core: reduc... |
1304 1305 1306 1307 1308 1309 1310 1311 1312 1313 1314 1315 1316 1317 1318 |
/* 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_READWRITE) kctl->tlv.c = snd_ctl_elem_user_tlv; /* This function manage to free the instance on failure. */ err = snd_ctl_add(card, kctl); |
2fbf182ed [PATCH] alsa: fix... |
1319 |
if (err < 0) |
1da177e4c Linux-2.6.12-rc2 |
1320 |
return err; |
cab2ed747 ALSA: ctl: fill i... |
1321 1322 1323 1324 1325 1326 1327 1328 1329 |
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. */ |
1da177e4c Linux-2.6.12-rc2 |
1330 1331 1332 1333 1334 1335 1336 |
down_write(&card->controls_rwsem); card->user_ctl_count++; up_write(&card->controls_rwsem); return 0; } |
82e9bae6f [ALSA] Remove xxx... |
1337 1338 |
static int snd_ctl_elem_add_user(struct snd_ctl_file *file, struct snd_ctl_elem_info __user *_info, int replace) |
1da177e4c Linux-2.6.12-rc2 |
1339 |
{ |
82e9bae6f [ALSA] Remove xxx... |
1340 |
struct snd_ctl_elem_info info; |
cab2ed747 ALSA: ctl: fill i... |
1341 |
int err; |
1da177e4c Linux-2.6.12-rc2 |
1342 1343 |
if (copy_from_user(&info, _info, sizeof(info))) return -EFAULT; |
cab2ed747 ALSA: ctl: fill i... |
1344 1345 1346 1347 1348 1349 1350 1351 1352 |
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; |
1da177e4c Linux-2.6.12-rc2 |
1353 |
} |
82e9bae6f [ALSA] Remove xxx... |
1354 1355 |
static int snd_ctl_elem_remove(struct snd_ctl_file *file, struct snd_ctl_elem_id __user *_id) |
1da177e4c Linux-2.6.12-rc2 |
1356 |
{ |
82e9bae6f [ALSA] Remove xxx... |
1357 |
struct snd_ctl_elem_id id; |
1da177e4c Linux-2.6.12-rc2 |
1358 1359 1360 |
if (copy_from_user(&id, _id, sizeof(id))) return -EFAULT; |
f217ac59b sound: snd_ctl_re... |
1361 |
return snd_ctl_remove_user_ctl(file, &id); |
1da177e4c Linux-2.6.12-rc2 |
1362 |
} |
82e9bae6f [ALSA] Remove xxx... |
1363 |
static int snd_ctl_subscribe_events(struct snd_ctl_file *file, int __user *ptr) |
1da177e4c Linux-2.6.12-rc2 |
1364 1365 1366 1367 1368 1369 1370 1371 1372 1373 1374 1375 1376 1377 1378 1379 1380 1381 1382 |
{ 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; } |
8aa9b586e [ALSA] Control AP... |
1383 1384 1385 |
static int snd_ctl_tlv_ioctl(struct snd_ctl_file *file, struct snd_ctl_tlv __user *_tlv, int op_flag) |
42750b04c [ALSA] Control AP... |
1386 |
{ |
8aa9b586e [ALSA] Control AP... |
1387 |
struct snd_card *card = file->card; |
42750b04c [ALSA] Control AP... |
1388 1389 |
struct snd_ctl_tlv tlv; struct snd_kcontrol *kctl; |
8aa9b586e [ALSA] Control AP... |
1390 |
struct snd_kcontrol_volatile *vd; |
42750b04c [ALSA] Control AP... |
1391 1392 1393 1394 1395 |
unsigned int len; int err = 0; if (copy_from_user(&tlv, _tlv, sizeof(tlv))) return -EFAULT; |
6123637fa sound: control: f... |
1396 |
if (tlv.length < sizeof(unsigned int) * 2) |
8aa9b586e [ALSA] Control AP... |
1397 |
return -EINVAL; |
c0bcdbdff ALSA: control: Av... |
1398 1399 |
if (!tlv.numid) return -EINVAL; |
8aa9b586e [ALSA] Control AP... |
1400 1401 1402 1403 1404 1405 1406 1407 1408 1409 1410 |
down_read(&card->controls_rwsem); kctl = snd_ctl_find_numid(card, tlv.numid); if (kctl == NULL) { err = -ENOENT; goto __kctl_end; } if (kctl->tlv.p == NULL) { err = -ENXIO; goto __kctl_end; } vd = &kctl->vd[tlv.numid - kctl->id.numid]; |
39d118677 ALSA: ctl: evalua... |
1411 1412 1413 1414 1415 1416 |
if ((op_flag == SNDRV_CTL_TLV_OP_READ && (vd->access & SNDRV_CTL_ELEM_ACCESS_TLV_READ) == 0) || (op_flag == SNDRV_CTL_TLV_OP_WRITE && (vd->access & SNDRV_CTL_ELEM_ACCESS_TLV_WRITE) == 0) || (op_flag == SNDRV_CTL_TLV_OP_CMD && (vd->access & SNDRV_CTL_ELEM_ACCESS_TLV_COMMAND) == 0)) { |
8aa9b586e [ALSA] Control AP... |
1417 1418 1419 1420 |
err = -ENXIO; goto __kctl_end; } if (vd->access & SNDRV_CTL_ELEM_ACCESS_TLV_CALLBACK) { |
bec145ae6 ALSA: remove unne... |
1421 |
if (vd->owner != NULL && vd->owner != file) { |
8aa9b586e [ALSA] Control AP... |
1422 1423 1424 |
err = -EPERM; goto __kctl_end; } |
bd483d4c6 ALSA: control - F... |
1425 |
err = kctl->tlv.c(kctl, op_flag, tlv.length, _tlv->tlv); |
8aa9b586e [ALSA] Control AP... |
1426 |
if (err > 0) { |
fd9f26e4e ALSA: control: Do... |
1427 |
struct snd_ctl_elem_id id = kctl->id; |
8aa9b586e [ALSA] Control AP... |
1428 |
up_read(&card->controls_rwsem); |
fd9f26e4e ALSA: control: Do... |
1429 |
snd_ctl_notify(card, SNDRV_CTL_EVENT_MASK_TLV, &id); |
8aa9b586e [ALSA] Control AP... |
1430 1431 1432 |
return 0; } } else { |
c30cf8cbe ALSA: control: Fi... |
1433 |
if (op_flag != SNDRV_CTL_TLV_OP_READ) { |
8aa9b586e [ALSA] Control AP... |
1434 1435 1436 1437 1438 1439 1440 1441 1442 1443 1444 |
err = -ENXIO; goto __kctl_end; } len = kctl->tlv.p[1] + 2 * sizeof(unsigned int); if (tlv.length < len) { err = -ENOMEM; goto __kctl_end; } if (copy_to_user(_tlv->tlv, kctl->tlv.p, len)) err = -EFAULT; } |
42750b04c [ALSA] Control AP... |
1445 |
__kctl_end: |
8aa9b586e [ALSA] Control AP... |
1446 1447 |
up_read(&card->controls_rwsem); return err; |
42750b04c [ALSA] Control AP... |
1448 |
} |
1da177e4c Linux-2.6.12-rc2 |
1449 1450 |
static long snd_ctl_ioctl(struct file *file, unsigned int cmd, unsigned long arg) { |
82e9bae6f [ALSA] Remove xxx... |
1451 1452 |
struct snd_ctl_file *ctl; struct snd_card *card; |
82e9bae6f [ALSA] Remove xxx... |
1453 |
struct snd_kctl_ioctl *p; |
1da177e4c Linux-2.6.12-rc2 |
1454 1455 1456 1457 1458 1459 |
void __user *argp = (void __user *)arg; int __user *ip = argp; int err; ctl = file->private_data; card = ctl->card; |
7eaa943c8 ALSA: Kill snd_as... |
1460 1461 |
if (snd_BUG_ON(!card)) return -ENXIO; |
1da177e4c Linux-2.6.12-rc2 |
1462 1463 1464 1465 1466 1467 |
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: |
42750b04c [ALSA] Control AP... |
1468 |
return snd_ctl_elem_list(card, argp); |
1da177e4c Linux-2.6.12-rc2 |
1469 1470 1471 |
case SNDRV_CTL_IOCTL_ELEM_INFO: return snd_ctl_elem_info_user(ctl, argp); case SNDRV_CTL_IOCTL_ELEM_READ: |
42750b04c [ALSA] Control AP... |
1472 |
return snd_ctl_elem_read_user(card, argp); |
1da177e4c Linux-2.6.12-rc2 |
1473 1474 1475 1476 1477 1478 1479 1480 1481 1482 1483 1484 1485 1486 |
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); |
8aa9b586e [ALSA] Control AP... |
1487 |
case SNDRV_CTL_IOCTL_TLV_READ: |
0cea76f33 ALSA: control: De... |
1488 |
return snd_ctl_tlv_ioctl(ctl, argp, SNDRV_CTL_TLV_OP_READ); |
8aa9b586e [ALSA] Control AP... |
1489 |
case SNDRV_CTL_IOCTL_TLV_WRITE: |
0cea76f33 ALSA: control: De... |
1490 |
return snd_ctl_tlv_ioctl(ctl, argp, SNDRV_CTL_TLV_OP_WRITE); |
8aa9b586e [ALSA] Control AP... |
1491 |
case SNDRV_CTL_IOCTL_TLV_COMMAND: |
0cea76f33 ALSA: control: De... |
1492 |
return snd_ctl_tlv_ioctl(ctl, argp, SNDRV_CTL_TLV_OP_CMD); |
1da177e4c Linux-2.6.12-rc2 |
1493 |
case SNDRV_CTL_IOCTL_POWER: |
a381a7a66 [ALSA] Decentrali... |
1494 |
return -ENOPROTOOPT; |
1da177e4c Linux-2.6.12-rc2 |
1495 1496 1497 1498 1499 1500 1501 1502 |
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); |
9244b2c30 [ALSA] alsa core:... |
1503 |
list_for_each_entry(p, &snd_control_ioctls, list) { |
1da177e4c Linux-2.6.12-rc2 |
1504 1505 1506 1507 1508 1509 1510 |
err = p->fioctl(card, ctl, cmd, arg); if (err != -ENOIOCTLCMD) { up_read(&snd_ioctl_rwsem); return err; } } up_read(&snd_ioctl_rwsem); |
bb0094574 ALSA: control: Us... |
1511 1512 |
dev_dbg(card->dev, "unknown ioctl = 0x%x ", cmd); |
1da177e4c Linux-2.6.12-rc2 |
1513 1514 |
return -ENOTTY; } |
82e9bae6f [ALSA] Remove xxx... |
1515 1516 |
static ssize_t snd_ctl_read(struct file *file, char __user *buffer, size_t count, loff_t * offset) |
1da177e4c Linux-2.6.12-rc2 |
1517 |
{ |
82e9bae6f [ALSA] Remove xxx... |
1518 |
struct snd_ctl_file *ctl; |
1da177e4c Linux-2.6.12-rc2 |
1519 1520 1521 1522 |
int err = 0; ssize_t result = 0; ctl = file->private_data; |
7eaa943c8 ALSA: Kill snd_as... |
1523 1524 |
if (snd_BUG_ON(!ctl || !ctl->card)) return -ENXIO; |
1da177e4c Linux-2.6.12-rc2 |
1525 1526 |
if (!ctl->subscribed) return -EBADFD; |
82e9bae6f [ALSA] Remove xxx... |
1527 |
if (count < sizeof(struct snd_ctl_event)) |
1da177e4c Linux-2.6.12-rc2 |
1528 1529 |
return -EINVAL; spin_lock_irq(&ctl->read_lock); |
82e9bae6f [ALSA] Remove xxx... |
1530 1531 1532 |
while (count >= sizeof(struct snd_ctl_event)) { struct snd_ctl_event ev; struct snd_kctl_event *kev; |
1da177e4c Linux-2.6.12-rc2 |
1533 1534 1535 1536 1537 1538 1539 1540 1541 1542 1543 1544 |
while (list_empty(&ctl->events)) { wait_queue_t wait; if ((file->f_flags & O_NONBLOCK) != 0 || result > 0) { err = -EAGAIN; goto __end_lock; } init_waitqueue_entry(&wait, current); add_wait_queue(&ctl->change_sleep, &wait); set_current_state(TASK_INTERRUPTIBLE); spin_unlock_irq(&ctl->read_lock); schedule(); remove_wait_queue(&ctl->change_sleep, &wait); |
0914f7961 ALSA: Avoid endle... |
1545 1546 |
if (ctl->card->shutdown) return -ENODEV; |
1da177e4c Linux-2.6.12-rc2 |
1547 |
if (signal_pending(current)) |
0e5d720ce [ALSA] sound/core... |
1548 |
return -ERESTARTSYS; |
1da177e4c Linux-2.6.12-rc2 |
1549 1550 1551 1552 1553 1554 1555 1556 1557 |
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); |
82e9bae6f [ALSA] Remove xxx... |
1558 |
if (copy_to_user(buffer, &ev, sizeof(struct snd_ctl_event))) { |
1da177e4c Linux-2.6.12-rc2 |
1559 1560 1561 1562 |
err = -EFAULT; goto __end; } spin_lock_irq(&ctl->read_lock); |
82e9bae6f [ALSA] Remove xxx... |
1563 1564 1565 |
buffer += sizeof(struct snd_ctl_event); count -= sizeof(struct snd_ctl_event); result += sizeof(struct snd_ctl_event); |
1da177e4c Linux-2.6.12-rc2 |
1566 1567 1568 1569 1570 1571 1572 1573 1574 1575 |
} __end_lock: spin_unlock_irq(&ctl->read_lock); __end: return result > 0 ? result : err; } static unsigned int snd_ctl_poll(struct file *file, poll_table * wait) { unsigned int mask; |
82e9bae6f [ALSA] Remove xxx... |
1576 |
struct snd_ctl_file *ctl; |
1da177e4c Linux-2.6.12-rc2 |
1577 1578 1579 1580 1581 1582 1583 1584 1585 1586 1587 1588 1589 1590 1591 1592 1593 1594 1595 |
ctl = file->private_data; if (!ctl->subscribed) return 0; poll_wait(file, &ctl->change_sleep, wait); mask = 0; if (!list_empty(&ctl->events)) mask |= POLLIN | POLLRDNORM; return mask; } /* * register the device-specific control-ioctls. * called from each device manager like pcm.c, hwdep.c, etc. */ static int _snd_ctl_register_ioctl(snd_kctl_ioctl_func_t fcn, struct list_head *lists) { |
82e9bae6f [ALSA] Remove xxx... |
1596 |
struct snd_kctl_ioctl *pn; |
1da177e4c Linux-2.6.12-rc2 |
1597 |
|
82e9bae6f [ALSA] Remove xxx... |
1598 |
pn = kzalloc(sizeof(struct snd_kctl_ioctl), GFP_KERNEL); |
1da177e4c Linux-2.6.12-rc2 |
1599 1600 1601 1602 1603 1604 1605 1606 |
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; } |
12cddbd86 ALSA: control: Ad... |
1607 1608 1609 1610 1611 1612 |
/** * 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. */ |
1da177e4c Linux-2.6.12-rc2 |
1613 1614 1615 1616 |
int snd_ctl_register_ioctl(snd_kctl_ioctl_func_t fcn) { return _snd_ctl_register_ioctl(fcn, &snd_control_ioctls); } |
c0d3fb39e [ALSA] Clean up E... |
1617 |
EXPORT_SYMBOL(snd_ctl_register_ioctl); |
1da177e4c Linux-2.6.12-rc2 |
1618 |
#ifdef CONFIG_COMPAT |
12cddbd86 ALSA: control: Ad... |
1619 1620 1621 1622 1623 |
/** * snd_ctl_register_ioctl_compat - register the device-specific 32bit compat * control-ioctls * @fcn: ioctl callback function */ |
1da177e4c Linux-2.6.12-rc2 |
1624 1625 1626 1627 |
int snd_ctl_register_ioctl_compat(snd_kctl_ioctl_func_t fcn) { return _snd_ctl_register_ioctl(fcn, &snd_control_compat_ioctls); } |
c0d3fb39e [ALSA] Clean up E... |
1628 |
EXPORT_SYMBOL(snd_ctl_register_ioctl_compat); |
1da177e4c Linux-2.6.12-rc2 |
1629 1630 1631 1632 1633 |
#endif /* * de-register the device-specific control-ioctls. */ |
82e9bae6f [ALSA] Remove xxx... |
1634 1635 |
static int _snd_ctl_unregister_ioctl(snd_kctl_ioctl_func_t fcn, struct list_head *lists) |
1da177e4c Linux-2.6.12-rc2 |
1636 |
{ |
82e9bae6f [ALSA] Remove xxx... |
1637 |
struct snd_kctl_ioctl *p; |
1da177e4c Linux-2.6.12-rc2 |
1638 |
|
7eaa943c8 ALSA: Kill snd_as... |
1639 1640 |
if (snd_BUG_ON(!fcn)) return -EINVAL; |
1da177e4c Linux-2.6.12-rc2 |
1641 |
down_write(&snd_ioctl_rwsem); |
9244b2c30 [ALSA] alsa core:... |
1642 |
list_for_each_entry(p, lists, list) { |
1da177e4c Linux-2.6.12-rc2 |
1643 1644 1645 1646 1647 1648 1649 1650 1651 1652 1653 |
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; } |
12cddbd86 ALSA: control: Ad... |
1654 1655 1656 1657 |
/** * snd_ctl_unregister_ioctl - de-register the device-specific control-ioctls * @fcn: ioctl callback function to unregister */ |
1da177e4c Linux-2.6.12-rc2 |
1658 1659 1660 1661 |
int snd_ctl_unregister_ioctl(snd_kctl_ioctl_func_t fcn) { return _snd_ctl_unregister_ioctl(fcn, &snd_control_ioctls); } |
c0d3fb39e [ALSA] Clean up E... |
1662 |
EXPORT_SYMBOL(snd_ctl_unregister_ioctl); |
1da177e4c Linux-2.6.12-rc2 |
1663 |
#ifdef CONFIG_COMPAT |
12cddbd86 ALSA: control: Ad... |
1664 1665 1666 1667 1668 |
/** * snd_ctl_unregister_ioctl - de-register the device-specific compat 32bit * control-ioctls * @fcn: ioctl callback function to unregister */ |
1da177e4c Linux-2.6.12-rc2 |
1669 1670 1671 1672 |
int snd_ctl_unregister_ioctl_compat(snd_kctl_ioctl_func_t fcn) { return _snd_ctl_unregister_ioctl(fcn, &snd_control_compat_ioctls); } |
c0d3fb39e [ALSA] Clean up E... |
1673 |
EXPORT_SYMBOL(snd_ctl_unregister_ioctl_compat); |
1da177e4c Linux-2.6.12-rc2 |
1674 1675 1676 1677 |
#endif static int snd_ctl_fasync(int fd, struct file * file, int on) { |
82e9bae6f [ALSA] Remove xxx... |
1678 |
struct snd_ctl_file *ctl; |
60aa49243 Rationalize fasyn... |
1679 |
|
1da177e4c Linux-2.6.12-rc2 |
1680 |
ctl = file->private_data; |
60aa49243 Rationalize fasyn... |
1681 |
return fasync_helper(fd, file, on, &ctl->fasync); |
1da177e4c Linux-2.6.12-rc2 |
1682 |
} |
23c18d4bf ALSA: control: Pr... |
1683 1684 1685 1686 1687 1688 1689 1690 1691 1692 1693 1694 1695 1696 1697 1698 1699 1700 1701 1702 |
/* 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); |
1da177e4c Linux-2.6.12-rc2 |
1703 1704 1705 1706 1707 1708 1709 1710 1711 1712 1713 1714 |
/* * ioctl32 compat */ #ifdef CONFIG_COMPAT #include "control_compat.c" #else #define snd_ctl_ioctl_compat NULL #endif /* * INIT PART */ |
9c2e08c59 [PATCH] mark stru... |
1715 |
static const struct file_operations snd_ctl_f_ops = |
1da177e4c Linux-2.6.12-rc2 |
1716 1717 1718 1719 1720 |
{ .owner = THIS_MODULE, .read = snd_ctl_read, .open = snd_ctl_open, .release = snd_ctl_release, |
02f4865fa ALSA: core - Defi... |
1721 |
.llseek = no_llseek, |
1da177e4c Linux-2.6.12-rc2 |
1722 1723 1724 1725 1726 |
.poll = snd_ctl_poll, .unlocked_ioctl = snd_ctl_ioctl, .compat_ioctl = snd_ctl_ioctl_compat, .fasync = snd_ctl_fasync, }; |
1da177e4c Linux-2.6.12-rc2 |
1727 1728 1729 |
/* * registration of the control device */ |
82e9bae6f [ALSA] Remove xxx... |
1730 |
static int snd_ctl_dev_register(struct snd_device *device) |
1da177e4c Linux-2.6.12-rc2 |
1731 |
{ |
82e9bae6f [ALSA] Remove xxx... |
1732 |
struct snd_card *card = device->device_data; |
1da177e4c Linux-2.6.12-rc2 |
1733 |
|
40a4b2638 ALSA: Simplify sn... |
1734 1735 |
return snd_register_device(SNDRV_DEVICE_TYPE_CONTROL, card, -1, &snd_ctl_f_ops, card, &card->ctl_dev); |
1da177e4c Linux-2.6.12-rc2 |
1736 1737 1738 1739 1740 |
} /* * disconnection of the control device */ |
82e9bae6f [ALSA] Remove xxx... |
1741 |
static int snd_ctl_dev_disconnect(struct snd_device *device) |
1da177e4c Linux-2.6.12-rc2 |
1742 |
{ |
82e9bae6f [ALSA] Remove xxx... |
1743 |
struct snd_card *card = device->device_data; |
82e9bae6f [ALSA] Remove xxx... |
1744 |
struct snd_ctl_file *ctl; |
1da177e4c Linux-2.6.12-rc2 |
1745 |
|
d8009882e ALSA: use correct... |
1746 |
read_lock(&card->ctl_files_rwlock); |
9244b2c30 [ALSA] alsa core:... |
1747 |
list_for_each_entry(ctl, &card->ctl_files, list) { |
1da177e4c Linux-2.6.12-rc2 |
1748 1749 1750 |
wake_up(&ctl->change_sleep); kill_fasync(&ctl->fasync, SIGIO, POLL_ERR); } |
d8009882e ALSA: use correct... |
1751 |
read_unlock(&card->ctl_files_rwlock); |
c461482c8 [ALSA] Unregister... |
1752 |
|
40a4b2638 ALSA: Simplify sn... |
1753 |
return snd_unregister_device(&card->ctl_dev); |
1da177e4c Linux-2.6.12-rc2 |
1754 1755 1756 1757 1758 |
} /* * free all controls */ |
82e9bae6f [ALSA] Remove xxx... |
1759 |
static int snd_ctl_dev_free(struct snd_device *device) |
1da177e4c Linux-2.6.12-rc2 |
1760 |
{ |
82e9bae6f [ALSA] Remove xxx... |
1761 1762 |
struct snd_card *card = device->device_data; struct snd_kcontrol *control; |
1da177e4c Linux-2.6.12-rc2 |
1763 1764 1765 1766 1767 1768 1769 |
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); |
0fcd9f4b3 ALSA: control: Em... |
1770 |
put_device(&card->ctl_dev); |
1da177e4c Linux-2.6.12-rc2 |
1771 1772 1773 1774 |
return 0; } /* |
1da177e4c Linux-2.6.12-rc2 |
1775 1776 1777 |
* create control core: * called from init.c */ |
82e9bae6f [ALSA] Remove xxx... |
1778 |
int snd_ctl_create(struct snd_card *card) |
1da177e4c Linux-2.6.12-rc2 |
1779 |
{ |
82e9bae6f [ALSA] Remove xxx... |
1780 |
static struct snd_device_ops ops = { |
1da177e4c Linux-2.6.12-rc2 |
1781 1782 1783 |
.dev_free = snd_ctl_dev_free, .dev_register = snd_ctl_dev_register, .dev_disconnect = snd_ctl_dev_disconnect, |
1da177e4c Linux-2.6.12-rc2 |
1784 |
}; |
0fcd9f4b3 ALSA: control: Em... |
1785 |
int err; |
1da177e4c Linux-2.6.12-rc2 |
1786 |
|
7eaa943c8 ALSA: Kill snd_as... |
1787 1788 |
if (snd_BUG_ON(!card)) return -ENXIO; |
0fcd9f4b3 ALSA: control: Em... |
1789 1790 1791 1792 1793 1794 1795 1796 1797 1798 |
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; |
1da177e4c Linux-2.6.12-rc2 |
1799 |
} |
b9ed4f2b6 [ALSA] Add helper... |
1800 1801 |
/* |
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* Frequently used control callbacks/helpers |
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*/ |
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/** * 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. */ |
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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; } |
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EXPORT_SYMBOL(snd_ctl_boolean_mono_info); |
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/** * 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. */ |
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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; } |
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EXPORT_SYMBOL(snd_ctl_boolean_stereo_info); |
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/** * 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. |
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* * Return: Zero. |
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*/ 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; |
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if (!items) return 0; |
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if (info->value.enumerated.item >= items) info->value.enumerated.item = items - 1; |
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WARN(strlen(names[info->value.enumerated.item]) >= sizeof(info->value.enumerated.name), "ALSA: too long item name '%s' ", names[info->value.enumerated.item]); |
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strlcpy(info->value.enumerated.name, names[info->value.enumerated.item], sizeof(info->value.enumerated.name)); return 0; } EXPORT_SYMBOL(snd_ctl_enum_info); |