1 files changed, 76 insertions, 0 deletions

diff --git a/sound/sound_firmware.c b/sound/sound_firmware.c
new file mode 100644
index 000000000000..6ddadfac35ad
--- /dev/null
+++ b/sound/sound_firmware.c
@@ -0,0 +1,76 @@
+#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;
+}
+