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TOMOYO Linux Cross Reference
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/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");
 80 

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