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ALSA: info - Implement common llseek for binary mode

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The llseek implementation is identical for existing driver implementations,
so let's merge to the common layer.  The same code for the text proc file
can be used even for the binary proc file.

The driver can provide its own llseek method if needed.  Then the common
code will be skipped.

Signed-off-by: Takashi Iwai <tiwai@suse.de>
This commit is contained in:
Takashi Iwai
2010-04-13 11:39:47 +02:00
parent d97e1b7823
commit 73029e0ff1
4 changed files with 32 additions and 129 deletions
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24
sound/drivers/opl4/opl4_proc.c
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@@ -90,35 +90,11 @@ static ssize_t snd_opl4_mem_proc_write(struct snd_info_entry *entry,
return count;
}
static loff_t snd_opl4_mem_proc_llseek(struct snd_info_entry *entry,
void *file_private_data,
struct file *file,
loff_t offset, int orig)
{
switch (orig) {
case SEEK_SET:
file->f_pos = offset;
break;
case SEEK_CUR:
file->f_pos += offset;
break;
case SEEK_END: /* offset is negative */
file->f_pos = entry->size + offset;
break;
default:
return -EINVAL;
}
if (file->f_pos > entry->size)
file->f_pos = entry->size;
return file->f_pos;
}
static struct snd_info_entry_ops snd_opl4_mem_proc_ops = {
.open = snd_opl4_mem_proc_open,
.release = snd_opl4_mem_proc_release,
.read = snd_opl4_mem_proc_read,
.write = snd_opl4_mem_proc_write,
.llseek = snd_opl4_mem_proc_llseek,
};
int snd_opl4_create_proc(struct snd_opl4 *opl4)