linux/sound/sound_firmware.c
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   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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