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