sound/sound_firmware.c

   1 #include <linux/vmalloc.h>
   2 #include <linux/module.h>
   3 #include <linux/fs.h>
   4 #include <linux/mm.h>
   5 #include <linux/slab.h>
   6 #include <asm/uaccess.h>
   7 #include "oss/sound_firmware.h"
   8
   9 static 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 = filp->f_path.dentry->d_inode->i_size;
  23         if (l <= 0 || l > 131072)
  24         {
  25                 printk(KERN_INFO "Invalid firmware '%s'\n", fn);
  26                 filp_close(filp, current->files);
  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, current->files);
  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, current->files);
  42                 return 0;
  43         }
  44         filp_close(filp, current->files);
  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
  66 int 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 }
  76 EXPORT_SYMBOL(mod_firmware_load);
  77
  78 MODULE_LICENSE("GPL");