| 1 | #include <linux/vmalloc.h>
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| 2 | #include <linux/module.h>
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| 3 | #include <linux/fs.h>
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| 4 | #include <linux/mm.h>
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| 5 | #include <linux/sched.h>
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| 6 | #include <asm/uaccess.h>
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| 7 | #include "oss/sound_firmware.h"
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| 8 |
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| 9 | static int do_mod_firmware_load(const char *fn, char **fp)
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| 10 | {
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| 11 | struct file* filp;
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| 12 | long l;
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| 13 | char *dp;
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| 14 | loff_t pos;
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| 15 |
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| 16 | filp = filp_open(fn, 0, 0);
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| 17 | if (IS_ERR(filp))
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| 18 | {
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| 19 | printk(KERN_INFO "Unable to load '%s'.\n", fn);
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| 20 | return 0;
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| 21 | }
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| 22 | l = i_size_read(filp->f_path.dentry->d_inode);
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| 23 | if (l <= 0 || l > 131072)
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| 24 | {
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| 25 | printk(KERN_INFO "Invalid firmware '%s'\n", fn);
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| 26 | filp_close(filp, current->files);
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| 27 | return 0;
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| 28 | }
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| 29 | dp = vmalloc(l);
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| 30 | if (dp == NULL)
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| 31 | {
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| 32 | printk(KERN_INFO "Out of memory loading '%s'.\n", fn);
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| 33 | filp_close(filp, current->files);
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| 34 | return 0;
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| 35 | }
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| 36 | pos = 0;
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| 37 | if (vfs_read(filp, dp, l, &pos) != l)
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| 38 | {
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| 39 | printk(KERN_INFO "Failed to read '%s'.\n", fn);
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| 40 | vfree(dp);
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| 41 | filp_close(filp, current->files);
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| 42 | return 0;
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| 43 | }
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| 44 | filp_close(filp, current->files);
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| 45 | *fp = dp;
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| 46 | return (int) l;
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| 47 | }
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| 48 |
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| 49 | /**
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| 50 | * mod_firmware_load - load sound driver firmware
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| 51 | * @fn: filename
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| 52 | * @fp: return for the buffer.
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| 53 | *
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| 54 | * Load the firmware for a sound module (up to 128K) into a buffer.
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| 55 | * The buffer is returned in *fp. It is allocated with vmalloc so is
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| 56 | * virtually linear and not DMAable. The caller should free it with
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| 57 | * vfree when finished.
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| 58 | *
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| 59 | * The length of the buffer is returned on a successful load, the
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| 60 | * value zero on a failure.
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| 61 | *
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| 62 | * Caution: This API is not recommended. Firmware should be loaded via
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| 63 | * request_firmware.
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| 64 | */
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| 65 |
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| 66 | int mod_firmware_load(const char *fn, char **fp)
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| 67 | {
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| 68 | int r;
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| 69 | mm_segment_t fs = get_fs();
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| 70 |
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| 71 | set_fs(get_ds());
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| 72 | r = do_mod_firmware_load(fn, fp);
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| 73 | set_fs(fs);
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| 74 | return r;
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| 75 | }
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| 76 | EXPORT_SYMBOL(mod_firmware_load);
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| 77 |
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| 78 | MODULE_LICENSE("GPL");
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