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
  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
  65 int 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 }
  75 EXPORT_SYMBOL(mod_firmware_load);
  76
  77 MODULE_LICENSE("GPL");