LXR linux/sound/sound

   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
  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(file_inode(filp));
  23        if (l <= 0 || l > 131072)
  24        {
  25                printk(KERN_INFO "Invalid firmware '%s'\n", fn);
  26                fput(filp);
  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                fput(filp);
  34                return 0;
  35        }
  36        if (kernel_read(filp, 0, dp, l) != l)
  37        {
  38                printk(KERN_INFO "Failed to read '%s'.\n", fn);
  39                vfree(dp);
  40                fput(filp);
  41                return 0;
  42        }
  43        fput(filp);
  44        *fp = dp;
  45        return (int) l;
  46}
  47
  48/**
  49 *      mod_firmware_load - load sound driver firmware
  50 *      @fn: filename
  51 *      @fp: return for the buffer.
  52 *
  53 *      Load the firmware for a sound module (up to 128K) into a buffer.
  54 *      The buffer is returned in *fp. It is allocated with vmalloc so is
  55 *      virtually linear and not DMAable. The caller should free it with
  56 *      vfree when finished.
  57 *
  58 *      The length of the buffer is returned on a successful load, the
  59 *      value zero on a failure.
  60 *
  61 *      Caution: This API is not recommended. Firmware should be loaded via
  62 *      request_firmware.
  63 */
  64 
  65int mod_firmware_load(const char *fn, char **fp)
  66{
  67        int r;
  68        mm_segment_t fs = get_fs();
  69
  70        set_fs(get_ds());
  71        r = do_mod_firmware_load(fn, fp);
  72        set_fs(fs);
  73        return r;
  74}
  75EXPORT_SYMBOL(mod_firmware_load);
  76
  77MODULE_LICENSE("GPL");
  78