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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 
 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");
 78 

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