File: /usr/src/linux/drivers/sound/sound_firmware.c

1     #include "os.h"
2     #define __KERNEL_SYSCALLS__
3     #include <linux/module.h>
4     #include <linux/fs.h>
5     #include <linux/mm.h>
6     #include <linux/slab.h>
7     #include <linux/unistd.h>
8     #include <asm/uaccess.h>
9     
10     static int errno;
11     static int do_mod_firmware_load(const char *fn, char **fp)
12     {
13     	int fd;
14     	long l;
15     	char *dp;
16     
17     	fd = open(fn, 0, 0);
18     	if (fd == -1)
19     	{
20     		printk(KERN_INFO "Unable to load '%s'.\n", fn);
21     		return 0;
22     	}
23     	l = lseek(fd, 0L, 2);
24     	if (l <= 0 || l > 131072)
25     	{
26     		printk(KERN_INFO "Invalid firmware '%s'\n", fn);
27     		sys_close(fd);
28     		return 0;
29     	}
30     	lseek(fd, 0L, 0);
31     	dp = vmalloc(l);
32     	if (dp == NULL)
33     	{
34     		printk(KERN_INFO "Out of memory loading '%s'.\n", fn);
35     		sys_close(fd);
36     		return 0;
37     	}
38     	if (read(fd, dp, l) != l)
39     	{
40     		printk(KERN_INFO "Failed to read '%s'.\n", fn);
41     		vfree(dp);
42     		sys_close(fd);
43     		return 0;
44     	}
45     	close(fd);
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      *	an ioctl call and a setup application. This function may disappear
65      *	in future.
66      */
67      
68     int mod_firmware_load(const char *fn, char **fp)
69     {
70     	int r;
71     	mm_segment_t fs = get_fs();
72     
73     	set_fs(get_ds());
74     	r = do_mod_firmware_load(fn, fp);
75     	set_fs(fs);
76     	return r;
77     }
78     
79