LXR linux/sound/sound

   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
   8static int do_mod_firmware_load(const char *fn, char **fp)
   9{
  10        struct file* filp;
  11        long l;
  12        char *dp;
  13        loff_t pos;
  14
  15        filp = filp_open(fn, 0, 0);
  16        if (IS_ERR(filp))
  17        {
  18                printk(KERN_INFO "Unable to load '%s'.\n", fn);
  19                return 0;
  20        }
  21        l = filp->f_dentry->d_inode->i_size;
  22        if (l <= 0 || l > 131072)
  23        {
  24                printk(KERN_INFO "Invalid firmware '%s'\n", fn);
  25                filp_close(filp, current->files);
  26                return 0;
  27        }
  28        dp = vmalloc(l);
  29        if (dp == NULL)
  30        {
  31                printk(KERN_INFO "Out of memory loading '%s'.\n", fn);
  32                filp_close(filp, current->files);
  33                return 0;
  34        }
  35        pos = 0;
  36        if (vfs_read(filp, dp, l, &pos) != l)
  37        {
  38                printk(KERN_INFO "Failed to read '%s'.\n", fn);
  39                vfree(dp);
  40                filp_close(filp, current->files);
  41                return 0;
  42        }
  43        filp_close(filp, current->files);
  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 *      an ioctl call and a setup application. This function may disappear
  63 *      in future.
  64 */
  65 
  66int 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
  77