1 #include <linux/vmalloc.h>
2 #include <linux/module.h>
3 #include <linux/fs.h>
4 #include <linux/mm.h>
5 #include <linux/slab.h>
6 #include <asm/uaccess.h>
7
8 static int do_mod_firmware_load(const char *fn, char **fp)
9 {
10 struct file* filp;
11 long l;
12 char *dp;
13 loff_t pos;
14
15 filp = filp_open(fn, 0, 0);
16 if (IS_ERR(filp))
17 {
18 printk(KERN_INFO "Unable to load '%s'.\n", fn);
19 return 0;
20 }
21 l = filp->f_dentry->d_inode->i_size;
22 if (l <= 0 || l > 131072)
23 {
24 printk(KERN_INFO "Invalid firmware '%s'\n", fn);
25 filp_close(filp, current->files);
26 return 0;
27 }
28 dp = vmalloc(l);
29 if (dp == NULL)
30 {
31 printk(KERN_INFO "Out of memory loading '%s'.\n", fn);
32 filp_close(filp, current->files);
33 return 0;
34 }
35 pos = 0;
36 if (vfs_read(filp, dp, l, &pos) != l)
37 {
38 printk(KERN_INFO "Failed to read '%s'.\n", fn);
39 vfree(dp);
40 filp_close(filp, current->files);
41 return 0;
42 }
43 filp_close(filp, current->files);
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 * an ioctl call and a setup application. This function may disappear
63 * in future.
64 */
65
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
77
|
This page was automatically generated by the
LXR engine.
|