tjh.dev
Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
kernel
os
linux
1#include <linux/vmalloc.h>
2#include <linux/module.h>
3#include <linux/fs.h>
4#include <linux/file.h>
5#include <linux/mm.h>
6#include <linux/sched.h>
7#include <asm/uaccess.h>
8#include "oss/sound_firmware.h"
9
10static int do_mod_firmware_load(const char *fn, char **fp)
11{
12 struct file* filp;
13 long l;
14 char *dp;
15
16 filp = filp_open(fn, 0, 0);
17 if (IS_ERR(filp))
18 {
19 printk(KERN_INFO "Unable to load '%s'.\n", fn);
20 return 0;
21 }
22 l = i_size_read(file_inode(filp));
23 if (l <= 0 || l > 131072)
24 {
25 printk(KERN_INFO "Invalid firmware '%s'\n", fn);
26 fput(filp);
27 return 0;
28 }
29 dp = vmalloc(l);
30 if (dp == NULL)
31 {
32 printk(KERN_INFO "Out of memory loading '%s'.\n", fn);
33 fput(filp);
34 return 0;
35 }
36 if (kernel_read(filp, 0, dp, l) != l)
37 {
38 printk(KERN_INFO "Failed to read '%s'.\n", fn);
39 vfree(dp);
40 fput(filp);
41 return 0;
42 }
43 fput(filp);
44 *fp = dp;
45 return (int) l;
46}
47
48/**
49 * mod_firmware_load - load sound driver firmware
50 * @fn: filename
51 * @fp: return for the buffer.
52 *
53 * Load the firmware for a sound module (up to 128K) into a buffer.
54 * The buffer is returned in *fp. It is allocated with vmalloc so is
55 * virtually linear and not DMAable. The caller should free it with
56 * vfree when finished.
57 *
58 * The length of the buffer is returned on a successful load, the
59 * value zero on a failure.
60 *
61 * Caution: This API is not recommended. Firmware should be loaded via
62 * request_firmware.
63 */
64
65int mod_firmware_load(const char *fn, char **fp)
66{
67 int r;
68 mm_segment_t fs = get_fs();
69
70 set_fs(get_ds());
71 r = do_mod_firmware_load(fn, fp);
72 set_fs(fs);
73 return r;
74}
75EXPORT_SYMBOL(mod_firmware_load);
76
77MODULE_LICENSE("GPL");