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Sourcecode: alsa-driver version File versions

sound_firmware.c

#include <linux/vmalloc.h>
#include <linux/module.h>
#include <linux/fs.h>
#include <linux/mm.h>
#include <linux/slab.h>
#include <asm/uaccess.h>

static int do_mod_firmware_load(const char *fn, char **fp)
{
      struct file* filp;
      long l;
      char *dp;
      loff_t pos;

      filp = filp_open(fn, 0, 0);
      if (IS_ERR(filp))
      {
            printk(KERN_INFO "Unable to load '%s'.\n", fn);
            return 0;
      }
      l = filp->f_dentry->d_inode->i_size;
      if (l <= 0 || l > 131072)
      {
            printk(KERN_INFO "Invalid firmware '%s'\n", fn);
            filp_close(filp, current->files);
            return 0;
      }
      dp = vmalloc(l);
      if (dp == NULL)
      {
            printk(KERN_INFO "Out of memory loading '%s'.\n", fn);
            filp_close(filp, current->files);
            return 0;
      }
      pos = 0;
      if (vfs_read(filp, dp, l, &pos) != l)
      {
            printk(KERN_INFO "Failed to read '%s'.\n", fn);
            vfree(dp);
            filp_close(filp, current->files);
            return 0;
      }
      filp_close(filp, current->files);
      *fp = dp;
      return (int) l;
}

/**
 *    mod_firmware_load - load sound driver firmware
 *    @fn: filename
 *    @fp: return for the buffer.
 *
 *    Load the firmware for a sound module (up to 128K) into a buffer.
 *    The buffer is returned in *fp. It is allocated with vmalloc so is
 *    virtually linear and not DMAable. The caller should free it with
 *    vfree when finished.
 *
 *    The length of the buffer is returned on a successful load, the
 *    value zero on a failure.
 *
 *    Caution: This API is not recommended. Firmware should be loaded via
 *    an ioctl call and a setup application. This function may disappear
 *    in future.
 */
 
int mod_firmware_load(const char *fn, char **fp)
{
      int r;
      mm_segment_t fs = get_fs();

      set_fs(get_ds());
      r = do_mod_firmware_load(fn, fp);
      set_fs(fs);
      return r;
}


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