Root/sound/sound_firmware.c

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    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 = i_size_read(file_inode(filp));
24    if (l <= 0 || l > 131072)
25    {
26        printk(KERN_INFO "Invalid firmware '%s'\n", fn);
27        fput(filp);
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        fput(filp);
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        fput(filp);
43        return 0;
44    }
45    fput(filp);
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 
67int 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}
77EXPORT_SYMBOL(mod_firmware_load);
78
79MODULE_LICENSE("GPL");
80

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