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authorLinus Torvalds <torvalds@ppc970.osdl.org>2005-04-16 15:20:36 -0700
committerLinus Torvalds <torvalds@ppc970.osdl.org>2005-04-16 15:20:36 -0700
commit1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 (patch)
tree0bba044c4ce775e45a88a51686b5d9f90697ea9d /sound/sound_firmware.c
downloadlinux-1da177e4c3f41524e886b7f1b8a0c1fc7321cac2.tar.gz
Linux-2.6.12-rc2v2.6.12-rc2
Initial git repository build. I'm not bothering with the full history, even though we have it. We can create a separate "historical" git archive of that later if we want to, and in the meantime it's about 3.2GB when imported into git - space that would just make the early git days unnecessarily complicated, when we don't have a lot of good infrastructure for it. Let it rip!
Diffstat (limited to 'sound/sound_firmware.c')
-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 00000000000..6ddadfac35a
--- /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;
+}
+