};
static DECLARE_RWSEM(snd_ioctl_rwsem);
+static DECLARE_RWSEM(snd_ctl_layer_rwsem);
static LIST_HEAD(snd_control_ioctls);
#ifdef CONFIG_COMPAT
static LIST_HEAD(snd_control_compat_ioctls);
#endif
+static struct snd_ctl_layer_ops *snd_ctl_layer;
static int snd_ctl_open(struct inode *inode, struct file *file)
{
}
EXPORT_SYMBOL(snd_ctl_notify);
+/**
+ * snd_ctl_notify_one - Send notification to user-space for a control change
+ * @card: the card to send notification
+ * @mask: the event mask, SNDRV_CTL_EVENT_*
+ * @kctl: the pointer with the control instance
+ * @ioff: the additional offset to the control index
+ *
+ * This function calls snd_ctl_notify() and does additional jobs
+ * like LED state changes.
+ */
+void snd_ctl_notify_one(struct snd_card *card, unsigned int mask,
+ struct snd_kcontrol *kctl, unsigned int ioff)
+{
+ struct snd_ctl_elem_id id = kctl->id;
+ struct snd_ctl_layer_ops *lops;
+
+ id.index += ioff;
+ id.numid += ioff;
+ snd_ctl_notify(card, mask, &id);
+ down_read(&snd_ctl_layer_rwsem);
+ for (lops = snd_ctl_layer; lops; lops = lops->next)
+ lops->lnotify(card, mask, kctl, ioff);
+ up_read(&snd_ctl_layer_rwsem);
+}
+EXPORT_SYMBOL(snd_ctl_notify_one);
+
/**
* snd_ctl_new - create a new control instance with some elements
* @kctl: the pointer to store new control instance
SNDRV_CTL_ELEM_ACCESS_TLV_READWRITE |
SNDRV_CTL_ELEM_ACCESS_TLV_COMMAND |
SNDRV_CTL_ELEM_ACCESS_TLV_CALLBACK |
+ SNDRV_CTL_ELEM_ACCESS_LED_MASK |
SNDRV_CTL_ELEM_ACCESS_SKIP_CHECK);
err = snd_ctl_new(&kctl, count, access, NULL);
{
struct snd_ctl_elem_id id;
unsigned int idx;
- unsigned int count;
struct snd_kcontrol *old;
int err;
kcontrol->id.numid = card->last_numid + 1;
card->last_numid += kcontrol->count;
- id = kcontrol->id;
- count = kcontrol->count;
- for (idx = 0; idx < count; idx++, id.index++, id.numid++)
- snd_ctl_notify(card, SNDRV_CTL_EVENT_MASK_ADD, &id);
+ for (idx = 0; idx < kcontrol->count; idx++)
+ snd_ctl_notify_one(card, SNDRV_CTL_EVENT_MASK_ADD, kcontrol, idx);
return 0;
}
*/
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);
+ for (idx = 0; idx < kcontrol->count; idx++)
+ snd_ctl_notify_one(card, SNDRV_CTL_EVENT_MASK_REMOVE, kcontrol, idx);
snd_ctl_free_one(kcontrol);
return 0;
}
vd->access |= SNDRV_CTL_ELEM_ACCESS_INACTIVE;
}
snd_ctl_build_ioff(id, kctl, index_offset);
- ret = 1;
+ downgrade_write(&card->controls_rwsem);
+ snd_ctl_notify_one(card, SNDRV_CTL_EVENT_MASK_INFO, kctl, index_offset);
+ up_read(&card->controls_rwsem);
+ return 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);
if (result < 0)
return result;
/* drop internal access flags */
- info.access &= ~SNDRV_CTL_ELEM_ACCESS_SKIP_CHECK;
+ info.access &= ~(SNDRV_CTL_ELEM_ACCESS_SKIP_CHECK|
+ SNDRV_CTL_ELEM_ACCESS_LED_MASK);
if (copy_to_user(_info, &info, sizeof(info)))
return -EFAULT;
return result;
unsigned int index_offset;
int result;
+ down_write(&card->controls_rwsem);
kctl = snd_ctl_find_id(card, &control->id);
- if (kctl == NULL)
+ if (kctl == NULL) {
+ up_write(&card->controls_rwsem);
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)) {
+ up_write(&card->controls_rwsem);
return -EPERM;
}
snd_ctl_build_ioff(&control->id, kctl, index_offset);
result = kctl->put(kctl, control);
- if (result < 0)
+ if (result < 0) {
+ up_write(&card->controls_rwsem);
return result;
+ }
if (result > 0) {
- struct snd_ctl_elem_id id = control->id;
- snd_ctl_notify(card, SNDRV_CTL_EVENT_MASK_VALUE, &id);
+ downgrade_write(&card->controls_rwsem);
+ snd_ctl_notify_one(card, SNDRV_CTL_EVENT_MASK_VALUE, kctl, index_offset);
+ up_read(&card->controls_rwsem);
+ } else {
+ up_write(&card->controls_rwsem);
}
return 0;
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;
{
struct user_element *ue = kctl->private_data;
unsigned int *container;
- struct snd_ctl_elem_id id;
unsigned int mask = 0;
int i;
int change;
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);
- }
+ for (i = 0; i < kctl->count; ++i)
+ snd_ctl_notify_one(ue->card, mask, kctl, i);
return change;
}
#define snd_ctl_ioctl_compat NULL
#endif
+/*
+ * control layers (audio LED etc.)
+ */
+
+/**
+ * snd_ctl_request_layer - request to use the layer
+ * @module_name: Name of the kernel module (NULL == build-in)
+ *
+ * Return an error code when the module cannot be loaded.
+ */
+int snd_ctl_request_layer(const char *module_name)
+{
+ struct snd_ctl_layer_ops *lops;
+
+ if (module_name == NULL)
+ return 0;
+ down_read(&snd_ctl_layer_rwsem);
+ for (lops = snd_ctl_layer; lops; lops = lops->next)
+ if (strcmp(lops->module_name, module_name) == 0)
+ break;
+ up_read(&snd_ctl_layer_rwsem);
+ if (lops)
+ return 0;
+ return request_module(module_name);
+}
+EXPORT_SYMBOL_GPL(snd_ctl_request_layer);
+
+/**
+ * snd_ctl_register_layer - register new control layer
+ * @lops: operation structure
+ *
+ * The new layer can track all control elements and do additional
+ * operations on top (like audio LED handling).
+ */
+void snd_ctl_register_layer(struct snd_ctl_layer_ops *lops)
+{
+ struct snd_card *card;
+ int card_number;
+
+ down_write(&snd_ctl_layer_rwsem);
+ lops->next = snd_ctl_layer;
+ snd_ctl_layer = lops;
+ up_write(&snd_ctl_layer_rwsem);
+ for (card_number = 0; card_number < SNDRV_CARDS; card_number++) {
+ card = snd_card_ref(card_number);
+ if (card) {
+ down_read(&card->controls_rwsem);
+ lops->lregister(card);
+ up_read(&card->controls_rwsem);
+ snd_card_unref(card);
+ }
+ }
+}
+EXPORT_SYMBOL_GPL(snd_ctl_register_layer);
+
+/**
+ * snd_ctl_disconnect_layer - disconnect control layer
+ * @lops: operation structure
+ *
+ * It is expected that the information about tracked cards
+ * is freed before this call (the disconnect callback is
+ * not called here).
+ */
+void snd_ctl_disconnect_layer(struct snd_ctl_layer_ops *lops)
+{
+ struct snd_ctl_layer_ops *lops2, *prev_lops2;
+
+ down_write(&snd_ctl_layer_rwsem);
+ for (lops2 = snd_ctl_layer, prev_lops2 = NULL; lops2; lops2 = lops2->next)
+ if (lops2 == lops) {
+ if (!prev_lops2)
+ snd_ctl_layer = lops->next;
+ else
+ prev_lops2->next = lops->next;
+ break;
+ }
+ up_write(&snd_ctl_layer_rwsem);
+}
+EXPORT_SYMBOL_GPL(snd_ctl_disconnect_layer);
+
/*
* INIT PART
*/
static int snd_ctl_dev_register(struct snd_device *device)
{
struct snd_card *card = device->device_data;
+ struct snd_ctl_layer_ops *lops;
+ int err;
- return snd_register_device(SNDRV_DEVICE_TYPE_CONTROL, card, -1,
- &snd_ctl_f_ops, card, &card->ctl_dev);
+ err = snd_register_device(SNDRV_DEVICE_TYPE_CONTROL, card, -1,
+ &snd_ctl_f_ops, card, &card->ctl_dev);
+ if (err < 0)
+ return err;
+ down_read(&card->controls_rwsem);
+ down_read(&snd_ctl_layer_rwsem);
+ for (lops = snd_ctl_layer; lops; lops = lops->next)
+ lops->lregister(card);
+ up_read(&snd_ctl_layer_rwsem);
+ up_read(&card->controls_rwsem);
+ return 0;
}
/*
{
struct snd_card *card = device->device_data;
struct snd_ctl_file *ctl;
+ struct snd_ctl_layer_ops *lops;
unsigned long flags;
read_lock_irqsave(&card->ctl_files_rwlock, flags);
}
read_unlock_irqrestore(&card->ctl_files_rwlock, flags);
+ down_read(&card->controls_rwsem);
+ down_read(&snd_ctl_layer_rwsem);
+ for (lops = snd_ctl_layer; lops; lops = lops->next)
+ lops->ldisconnect(card);
+ up_read(&snd_ctl_layer_rwsem);
+ up_read(&card->controls_rwsem);
+
return snd_unregister_device(&card->ctl_dev);
}
git.samba.org / sfrench / cifs-2.6.git / blobdiff