1 #include <linux/vmalloc.h>
2 #include <linux/module.h>
3 #include <linux/fs.h>
4 #include <linux/mm.h>
5 #include <linux/sched.h>
6 #include <asm/uaccess.h>
7 #include "oss/sound_firmware.h"
8
do_mod_firmware_load(const char * fn,char ** fp)9 static int do_mod_firmware_load(const char *fn, char **fp)
10 {
11 struct file* filp;
12 long l;
13 char *dp;
14 loff_t pos;
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(filp->f_path.dentry->d_inode);
23 if (l <= 0 || l > 131072)
24 {
25 printk(KERN_INFO "Invalid firmware '%s'\n", fn);
26 filp_close(filp, current->files);
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 filp_close(filp, current->files);
34 return 0;
35 }
36 pos = 0;
37 if (vfs_read(filp, dp, l, &pos) != l)
38 {
39 printk(KERN_INFO "Failed to read '%s'.\n", fn);
40 vfree(dp);
41 filp_close(filp, current->files);
42 return 0;
43 }
44 filp_close(filp, current->files);
45 *fp = dp;
46 return (int) l;
47 }
48
49 /**
50 * mod_firmware_load - load sound driver firmware
51 * @fn: filename
52 * @fp: return for the buffer.
53 *
54 * Load the firmware for a sound module (up to 128K) into a buffer.
55 * The buffer is returned in *fp. It is allocated with vmalloc so is
56 * virtually linear and not DMAable. The caller should free it with
57 * vfree when finished.
58 *
59 * The length of the buffer is returned on a successful load, the
60 * value zero on a failure.
61 *
62 * Caution: This API is not recommended. Firmware should be loaded via
63 * request_firmware.
64 */
65
mod_firmware_load(const char * fn,char ** fp)66 int mod_firmware_load(const char *fn, char **fp)
67 {
68 int r;
69 mm_segment_t fs = get_fs();
70
71 set_fs(get_ds());
72 r = do_mod_firmware_load(fn, fp);
73 set_fs(fs);
74 return r;
75 }
76 EXPORT_SYMBOL(mod_firmware_load);
77
78 MODULE_LICENSE("GPL");
79