77 lines
1.7 KiB
C
77 lines
1.7 KiB
C
|
#include <linux/vmalloc.h>
|
||
|
|
#include <linux/module.h>
|
||
|
|
#include <linux/fs.h>
|
||
|
|
#include <linux/mm.h>
|
||
|
|
#include <linux/slab.h>
|
||
|
|
#include <asm/uaccess.h>
|
||
|
|
|
||
|
|
static int do_mod_firmware_load(const char *fn, char **fp)
|
||
|
|
{
|
||
|
|
struct file* filp;
|
||
|
|
long l;
|
||
|
|
char *dp;
|
||
|
|
loff_t pos;
|
||
|
|
|
||
|
|
filp = filp_open(fn, 0, 0);
|
||
|
|
if (IS_ERR(filp))
|
||
|
|
{
|
||
|
|
printk(KERN_INFO "Unable to load '%s'.\n", fn);
|
||
|
|
return 0;
|
||
|
|
}
|
||
|
|
l = filp->f_dentry->d_inode->i_size;
|
||
|
|
if (l <= 0 || l > 131072)
|
||
|
|
{
|
||
|
|
printk(KERN_INFO "Invalid firmware '%s'\n", fn);
|
||
|
|
filp_close(filp, current->files);
|
||
|
|
return 0;
|
||
|
|
}
|
||
|
|
dp = vmalloc(l);
|
||
|
|
if (dp == NULL)
|
||
|
|
{
|
||
|
|
printk(KERN_INFO "Out of memory loading '%s'.\n", fn);
|
||
|
|
filp_close(filp, current->files);
|
||
|
|
return 0;
|
||
|
|
}
|
||
|
|
pos = 0;
|
||
|
|
if (vfs_read(filp, dp, l, &pos) != l)
|
||
|
|
{
|
||
|
|
printk(KERN_INFO "Failed to read '%s'.\n", fn);
|
||
|
|
vfree(dp);
|
||
|
|
filp_close(filp, current->files);
|
||
|
|
return 0;
|
||
|
|
}
|
||
|
|
filp_close(filp, current->files);
|
||
|
|
*fp = dp;
|
||
|
|
return (int) l;
|
||
|
|
}
|
||
|
|
|
||
|
|
/**
|
||
|
|
* mod_firmware_load - load sound driver firmware
|
||
|
|
* @fn: filename
|
||
|
|
* @fp: return for the buffer.
|
||
|
|
*
|
||
|
|
* Load the firmware for a sound module (up to 128K) into a buffer.
|
||
|
|
* The buffer is returned in *fp. It is allocated with vmalloc so is
|
||
|
|
* virtually linear and not DMAable. The caller should free it with
|
||
|
|
* vfree when finished.
|
||
|
|
*
|
||
|
|
* The length of the buffer is returned on a successful load, the
|
||
|
|
* value zero on a failure.
|
||
|
|
*
|
||
|
|
* Caution: This API is not recommended. Firmware should be loaded via
|
||
|
|
* an ioctl call and a setup application. This function may disappear
|
||
|
|
* in future.
|
||
|
|
*/
|
||
|
|
|
||
|
|
int mod_firmware_load(const char *fn, char **fp)
|
||
|
|
{
|
||
|
|
int r;
|
||
|
|
mm_segment_t fs = get_fs();
|
||
|
|
|
||
|
|
set_fs(get_ds());
|
||
|
|
r = do_mod_firmware_load(fn, fp);
|
||
|
|
set_fs(fs);
|
||
|
|
return r;
|
||
|
|
}
|
||
|
|
|