ALSA: Add USB US122L driver

Added a new US122L usb-audio driver.  This driver works together with a
dedicated alsa-lib plugin.

Signed-off-by: Takashi Iwai <tiwai@suse.de>
Signed-off-by: Jaroslav Kysela <perex@perex.cz>

1 files changed, 112 insertions, 0 deletions

diff --git a/sound/usb/usx2y/usb_stream.h b/sound/usb/usx2y/usb_stream.h
new file mode 100644
index 000000000000..4dd74ab1e9cc
--- /dev/null
+++ b/sound/usb/usx2y/usb_stream.h
@@ -0,0 +1,112 @@
+/*
+ * Copyright (C) 2007, 2008 Karsten Wiese <fzu@wemgehoertderstaat.de>
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License as published by the
+ * Free Software Foundation; either version 2 of the License, or (at your
+ * option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful, but
+ * WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
+ * or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
+ * for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software Foundation,
+ * Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
+ */
+
+#define USB_STREAM_INTERFACE_VERSION 2
+
+#define SNDRV_USB_STREAM_IOCTL_SET_PARAMS \
+        _IOW('H', 0x90, struct usb_stream_config)
+
+struct usb_stream_packet {
+        unsigned offset;
+        unsigned length;
+};
+
+
+struct usb_stream_config {
+        unsigned version;
+        unsigned sample_rate;
+        unsigned period_frames;
+        unsigned frame_size;
+};
+
+struct usb_stream {
+        struct usb_stream_config cfg;
+        unsigned read_size;
+        unsigned write_size;
+
+        int period_size;
+
+        unsigned state;
+
+        int idle_insize;
+        int idle_outsize;
+        int sync_packet;
+        unsigned insize_done;
+        unsigned periods_done;
+        unsigned periods_polled;
+
+        struct usb_stream_packet outpacket[2];
+        unsigned                 inpackets;
+        unsigned                 inpacket_head;
+        unsigned                 inpacket_split;
+        unsigned                 inpacket_split_at;
+        unsigned                 next_inpacket_split;
+        unsigned                 next_inpacket_split_at;
+        struct usb_stream_packet inpacket[0];
+};
+
+enum usb_stream_state {
+        usb_stream_invalid,
+        usb_stream_stopped,
+        usb_stream_sync0,
+        usb_stream_sync1,
+        usb_stream_ready,
+        usb_stream_running,
+        usb_stream_xrun,
+};
+
+#if __KERNEL__
+
+#define USB_STREAM_NURBS 4
+#define USB_STREAM_URBDEPTH 4
+
+struct usb_stream_kernel {
+        struct usb_stream *s;
+
+        void *write_page;
+
+        unsigned n_o_ps;
+
+        struct urb *inurb[USB_STREAM_NURBS];
+        struct urb *idle_inurb;
+        struct urb *completed_inurb;
+        struct urb *outurb[USB_STREAM_NURBS];
+        struct urb *idle_outurb;
+        struct urb *completed_outurb;
+        struct urb *i_urb;
+
+        int iso_frame_balance;
+
+        wait_queue_head_t sleep;
+
+        unsigned out_phase;
+        unsigned out_phase_peeked;
+        unsigned freqn;
+};
+
+struct usb_stream *usb_stream_new(struct usb_stream_kernel *sk,
+                                  struct usb_device *dev,
+                                  unsigned in_endpoint, unsigned out_endpoint,
+                                  unsigned sample_rate, unsigned use_packsize,
+                                  unsigned period_frames, unsigned frame_size);
+void usb_stream_free(struct usb_stream_kernel *);
+int usb_stream_start(struct usb_stream_kernel *);
+void usb_stream_stop(struct usb_stream_kernel *);
+
+
+#endif