/*
* Information interface for ALSA driver
- * Copyright (c) by Jaroslav Kysela <perex@suse.cz>
+ * Copyright (c) by Jaroslav Kysela <perex@perex.cz>
*
*
* This program is free software; you can redistribute it and/or modify
*
*/
-#include <sound/driver.h>
#include <linux/init.h>
#include <linux/time.h>
+#include <linux/mm.h>
+#include <linux/slab.h>
#include <linux/smp_lock.h>
#include <linux/string.h>
#include <sound/core.h>
char *nbuf;
nsize = PAGE_ALIGN(nsize);
- nbuf = kmalloc(nsize, GFP_KERNEL);
+ nbuf = krealloc(buffer->buffer, nsize, GFP_KERNEL);
if (! nbuf)
return -ENOMEM;
- memcpy(nbuf, buffer->buffer, buffer->len);
- kfree(buffer->buffer);
buffer->buffer = nbuf;
buffer->len = nsize;
return 0;
*
* Returns the size of output string.
*/
-int snd_iprintf(struct snd_info_buffer *buffer, char *fmt,...)
+int snd_iprintf(struct snd_info_buffer *buffer, const char *fmt, ...)
{
va_list args;
int len, res;
struct snd_info_entry *snd_oss_root;
#endif
-static inline void snd_info_entry_prepare(struct proc_dir_entry *de)
-{
- de->owner = THIS_MODULE;
-}
-
static void snd_remove_proc_entry(struct proc_dir_entry *parent,
struct proc_dir_entry *de)
{
{
struct snd_info_private_data *data;
struct snd_info_entry *entry;
- loff_t ret;
+ loff_t ret = -EINVAL, size;
data = file->private_data;
entry = data->entry;
- lock_kernel();
- switch (entry->content) {
- case SNDRV_INFO_CONTENT_TEXT:
- switch (orig) {
- case SEEK_SET:
- file->f_pos = offset;
- ret = file->f_pos;
- goto out;
- case SEEK_CUR:
- file->f_pos += offset;
- ret = file->f_pos;
- goto out;
- case SEEK_END:
- default:
- ret = -EINVAL;
- goto out;
- }
+ mutex_lock(&entry->access);
+ if (entry->content == SNDRV_INFO_CONTENT_DATA &&
+ entry->c.ops->llseek) {
+ offset = entry->c.ops->llseek(entry,
+ data->file_private_data,
+ file, offset, orig);
+ goto out;
+ }
+ if (entry->content == SNDRV_INFO_CONTENT_DATA)
+ size = entry->size;
+ else
+ size = 0;
+ switch (orig) {
+ case SEEK_SET:
break;
- case SNDRV_INFO_CONTENT_DATA:
- if (entry->c.ops->llseek) {
- ret = entry->c.ops->llseek(entry,
- data->file_private_data,
- file, offset, orig);
+ case SEEK_CUR:
+ offset += file->f_pos;
+ break;
+ case SEEK_END:
+ if (!size)
goto out;
- }
+ offset += size;
break;
- }
- ret = -ENXIO;
-out:
- unlock_kernel();
+ default:
+ goto out;
+ }
+ if (offset < 0)
+ goto out;
+ if (size && offset > size)
+ offset = size;
+ file->f_pos = offset;
+ ret = offset;
+ out:
+ mutex_unlock(&entry->access);
return ret;
}
loff_t pos;
data = file->private_data;
- snd_assert(data != NULL, return -ENXIO);
+ if (snd_BUG_ON(!data))
+ return -ENXIO;
pos = *offset;
if (pos < 0 || (long) pos != pos || (ssize_t) count < 0)
return -EIO;
return -EFAULT;
break;
case SNDRV_INFO_CONTENT_DATA:
- if (entry->c.ops->read)
+ if (pos >= entry->size)
+ return 0;
+ if (entry->c.ops->read) {
+ size = entry->size - pos;
+ size = min(count, size);
size = entry->c.ops->read(entry,
data->file_private_data,
- file, buffer, count, pos);
+ file, buffer, size, pos);
+ }
break;
}
if ((ssize_t) size > 0)
loff_t pos;
data = file->private_data;
- snd_assert(data != NULL, return -ENXIO);
+ if (snd_BUG_ON(!data))
+ return -ENXIO;
entry = data->entry;
pos = *offset;
if (pos < 0 || (long) pos != pos || (ssize_t) count < 0)
size = count;
break;
case SNDRV_INFO_CONTENT_DATA:
- if (entry->c.ops->write)
+ if (entry->c.ops->write && count > 0) {
+ size_t maxsize = entry->size - pos;
+ count = min(count, maxsize);
size = entry->c.ops->write(entry,
data->file_private_data,
file, buffer, count, pos);
+ }
break;
}
if ((ssize_t) size > 0)
static int snd_info_entry_mmap(struct file *file, struct vm_area_struct *vma)
{
- struct inode *inode = file->f_dentry->d_inode;
+ struct inode *inode = file->f_path.dentry->d_inode;
struct snd_info_private_data *data;
struct snd_info_entry *entry;
return -ENXIO;
}
-static struct file_operations snd_info_entry_operations =
+static const struct file_operations snd_info_entry_operations =
{
.owner = THIS_MODULE,
.llseek = snd_info_entry_llseek,
.release = snd_info_entry_release,
};
-/**
- * snd_create_proc_entry - create a procfs entry
- * @name: the name of the proc file
- * @mode: the file permission bits, S_Ixxx
- * @parent: the parent proc-directory entry
- *
- * Creates a new proc file entry with the given name and permission
- * on the given directory.
- *
- * Returns the pointer of new instance or NULL on failure.
- */
-static struct proc_dir_entry *snd_create_proc_entry(const char *name, mode_t mode,
- struct proc_dir_entry *parent)
-{
- struct proc_dir_entry *p;
- p = create_proc_entry(name, mode, parent);
- if (p)
- snd_info_entry_prepare(p);
- return p;
-}
-
int __init snd_info_init(void)
{
struct proc_dir_entry *p;
- p = snd_create_proc_entry("asound", S_IFDIR | S_IRUGO | S_IXUGO, &proc_root);
+ p = create_proc_entry("asound", S_IFDIR | S_IRUGO | S_IXUGO, NULL);
if (p == NULL)
return -ENOMEM;
snd_proc_root = p;
#ifdef CONFIG_SND_OSSEMUL
snd_info_free_entry(snd_oss_root);
#endif
- snd_remove_proc_entry(&proc_root, snd_proc_root);
+ snd_remove_proc_entry(NULL, snd_proc_root);
}
return 0;
}
char str[8];
struct snd_info_entry *entry;
- snd_assert(card != NULL, return -ENXIO);
+ if (snd_BUG_ON(!card))
+ return -ENXIO;
sprintf(str, "card%i", card->number);
if ((entry = snd_info_create_module_entry(card->module, str, NULL)) == NULL)
{
struct proc_dir_entry *p;
- snd_assert(card != NULL, return -ENXIO);
+ if (snd_BUG_ON(!card))
+ return -ENXIO;
if (!strcmp(card->id, card->proc_root->name))
return 0;
}
/*
+ * called on card->id change
+ */
+void snd_info_card_id_change(struct snd_card *card)
+{
+ mutex_lock(&info_mutex);
+ if (card->proc_root_link) {
+ snd_remove_proc_entry(snd_proc_root, card->proc_root_link);
+ card->proc_root_link = NULL;
+ }
+ if (strcmp(card->id, card->proc_root->name))
+ card->proc_root_link = proc_symlink(card->id,
+ snd_proc_root,
+ card->proc_root->name);
+ mutex_unlock(&info_mutex);
+}
+
+/*
* de-register the card proc file
* called from init.c
*/
void snd_info_card_disconnect(struct snd_card *card)
{
- snd_assert(card != NULL, return);
+ if (!card)
+ return;
mutex_lock(&info_mutex);
if (card->proc_root_link) {
snd_remove_proc_entry(snd_proc_root, card->proc_root_link);
*/
int snd_info_card_free(struct snd_card *card)
{
- snd_assert(card != NULL, return -ENXIO);
+ if (!card)
+ return 0;
snd_info_free_entry(card->proc_root);
card->proc_root = NULL;
return 0;
* Returns the updated pointer of the original string so that
* it can be used for the next call.
*/
-char *snd_info_get_str(char *dest, char *src, int len)
+const char *snd_info_get_str(char *dest, const char *src, int len)
{
int c;
return;
list_del_init(&entry->list);
root = entry->parent == NULL ? snd_proc_root : entry->parent->p;
- snd_assert(root, return);
+ snd_BUG_ON(!root);
snd_remove_proc_entry(root, entry->p);
entry->p = NULL;
}
{
struct proc_dir_entry *root, *p = NULL;
- snd_assert(entry != NULL, return -ENXIO);
+ if (snd_BUG_ON(!entry))
+ return -ENXIO;
root = entry->parent == NULL ? snd_proc_root : entry->parent->p;
mutex_lock(&info_mutex);
- p = snd_create_proc_entry(entry->name, entry->mode, root);
+ p = create_proc_entry(entry->name, entry->mode, root);
if (!p) {
mutex_unlock(&info_mutex);
return -ENOMEM;
}
- p->owner = entry->module;
if (!S_ISDIR(entry->mode))
p->proc_fops = &snd_info_entry_operations;
p->size = entry->size;
git://ftp.safe.ca / safe / jmp / linux-2.6 / blobdiff