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 <linux/sched.h>
7 #include <asm/uaccess.h>
8 #include "oss/sound_firmware.h"
9
10 static int do_mod_firmware_load(const char *fn, char **fp)
11 {
12 struct file* filp;
13 long l;
14 char *dp;
15 loff_t pos;
16
17 filp = filp_open(fn, 0, 0);
18 if (IS_ERR(filp))
19 {
20 printk(KERN_INFO "Unable to load '%s'.\n", fn);
21 return 0;
22 }
23 l = filp->f_path.dentry->d_inode->i_size;
24 if (l <= 0 || l > 131072)
25 {
26 printk(KERN_INFO "Invalid firmware '%s'\n", fn);
27 filp_close(filp, current->files);
28 return 0;
29 }
30 dp = vmalloc(l);
31 if (dp == NULL)
32 {
33 printk(KERN_INFO "Out of memory loading '%s'.\n", fn);
34 filp_close(filp, current->files);
35 return 0;
36 }
37 pos = 0;
38 if (vfs_read(filp, dp, l, &pos) != l)
39 {
40 printk(KERN_INFO "Failed to read '%s'.\n", fn);
41 vfree(dp);
42 filp_close(filp, current->files);
43 return 0;
44 }
45 filp_close(filp, current->files);
46 *fp = dp;
47 return (int) l;
48 }
49
50 /**
51 * mod_firmware_load - load sound driver firmware
52 * @fn: filename
53 * @fp: return for the buffer.
54 *
55 * Load the firmware for a sound module (up to 128K) into a buffer.
56 * The buffer is returned in *fp. It is allocated with vmalloc so is
57 * virtually linear and not DMAable. The caller should free it with
58 * vfree when finished.
59 *
60 * The length of the buffer is returned on a successful load, the
61 * value zero on a failure.
62 *
63 * Caution: This API is not recommended. Firmware should be loaded via
64 * request_firmware.
65 */
66
67 int mod_firmware_load(const char *fn, char **fp)
68 {
69 int r;
70 mm_segment_t fs = get_fs();
71
72 set_fs(get_ds());
73 r = do_mod_firmware_load(fn, fp);
74 set_fs(fs);
75 return r;
76 }
77 EXPORT_SYMBOL(mod_firmware_load);
78
79 MODULE_LICENSE("GPL");
80
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