Root/sound/sound_firmware.c

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
9static 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 
66int 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}
76EXPORT_SYMBOL(mod_firmware_load);
77
78MODULE_LICENSE("GPL");
79

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