sound/sound_firmware.c

   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
  10 static 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
  67 int 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 }
  77 EXPORT_SYMBOL(mod_firmware_load);
  78
  79 MODULE_LICENSE("GPL");