Add the rt linux 4.1.3-rt3 as base

[kvmfornfv.git] / kernel / sound / sound_firmware.c

diff --git a/kernel/sound/sound_firmware.c b/kernel/sound/sound_firmware.c
new file mode 100644 (file)
index 0000000..b155137
--- /dev/null
+++ b/kernel/sound/sound_firmware.c
@@ -0,0 +1,79 @@
+#include <linux/vmalloc.h>
+#include <linux/module.h>
+#include <linux/fs.h>
+#include <linux/file.h>
+#include <linux/mm.h>
+#include <linux/sched.h>
+#include <asm/uaccess.h>
+#include "oss/sound_firmware.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 = i_size_read(file_inode(filp));
+       if (l <= 0 || l > 131072)
+       {
+               printk(KERN_INFO "Invalid firmware '%s'\n", fn);
+               fput(filp);
+               return 0;
+       }
+       dp = vmalloc(l);
+       if (dp == NULL)
+       {
+               printk(KERN_INFO "Out of memory loading '%s'.\n", fn);
+               fput(filp);
+               return 0;
+       }
+       pos = 0;
+       if (vfs_read(filp, dp, l, &pos) != l)
+       {
+               printk(KERN_INFO "Failed to read '%s'.\n", fn);
+               vfree(dp);
+               fput(filp);
+               return 0;
+       }
+       fput(filp);
+       *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
+ *     request_firmware.
+ */
+ 
+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;
+}
+EXPORT_SYMBOL(mod_firmware_load);
+
+MODULE_LICENSE("GPL");