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/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, NULL);
  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, NULL);
  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, NULL);
  42                return 0;
  43        }
  44        filp_close(filp, NULL);
  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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