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-rw-r--r--sound/sound_firmware.c76
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;
+}
+