Merge branch 'v4l_for_linus' of git://git.kernel.org/pub/scm/linux/kernel/git/mchehab/linux-media

Pull media updates from Mauro Carvalho Chehab:
 "The first part of the media updates for Kernel 3.7.

  This series contain:

   - A major tree renaming patch series: now, drivers are organized
     internally by their used bus, instead of by V4L2 and/or DVB API,
     providing a cleaner driver location for hybrid drivers that
     implement both APIs, and allowing to cleanup the Kconfig items and
     make them more intuitive for the end user;

   - Media Kernel developers are typically very lazy with their duties
     of keeping the MAINTAINERS entries for their drivers updated.  As
     now the tree is more organized, we're doing an effort to add/update
     those entries for the drivers that aren't currently orphan;

   - Several DVB USB drivers got moved to a new DVB USB v2 core; the new
     core fixes several bugs (as the existing one that got bitroted).
     Now, suspend/resume finally started to work fine (at least with
     some devices - we should expect more work with regards to it);

   - added multistream support for DVB-T2, and unified the API for
     DVB-S2 and ISDB-S.  Backward binary support is preserved;

   - as usual, a few new drivers, some V4L2 core improvements and lots
     of drivers improvements and fixes.

  There are some points to notice on this series:

   1) you should expect a trivial merge conflict on your tree, with the
      removal of Documentation/feature-removal-schedule.txt: this series
      would be adding two additional entries there.  I opted to not
      rebase it due to this recent change;

   2) With regards to the PCTV 520e udev-related breakage, I opted to
      fix it in a way that the patches can be backported to 3.5 even
      without your firmware fix patch.  This way, Greg doesn't need to
      rush backporting your patch (as there are still the firmware cache
      and firmware path customization issues to be addressed there).

      I'll send later a patch (likely after the end of the merge window)
      reverting the rest of the DRX-K async firmware request, fully
      restoring its original behaviour to allow media drivers to
      initialize everything serialized as before for 3.7 and upper.

   3) I'm planning to work on this weekend to test the DMABUF patches
      for V4L2.  The patches are on my queue for several Kernel cycles,
      but, up to now, there is/was no way to test the series locally.

      I have some concerns about this particular changeset with regards
      to security issues, and with regards to the replacement of the old
      VIDIOC_OVERLAY ioctl's that is broken on modern systems, due to
      GPU drivers change.  The Overlay API allows direct PCI2PCI
      transfers from a media capture card into the GPU framebuffer, but
      its API is crappy.  Also, the only existing X11 driver that
      implements it requires a XV extension that is not available
      anymore on modern drivers.  The DMABUF can do the same thing, but
      with it is promising to be a properly-designed API.  If I can
      successfully test this series and be happy with it, I should be
      asking you to pull them next week."

* 'v4l_for_linus' of git://git.kernel.org/pub/scm/linux/kernel/git/mchehab/linux-media: (717 commits)
  em28xx: regression fix: use DRX-K sync firmware requests on em28xx
  drxk: allow loading firmware synchrousnously
  em28xx: Make all em28xx extensions to be initialized asynchronously
  [media] tda18271: properly report read errors in tda18271_get_id
  [media] tda18271: delay IR & RF calibration until init() if delay_cal is set
  [media] MAINTAINERS: add Michael Krufky as tda827x maintainer
  [media] MAINTAINERS: add Michael Krufky as tda8290 maintainer
  [media] MAINTAINERS: add Michael Krufky as cxusb maintainer
  [media] MAINTAINERS: add Michael Krufky as lg2160 maintainer
  [media] MAINTAINERS: add Michael Krufky as lgdt3305 maintainer
  [media] MAINTAINERS: add Michael Krufky as mxl111sf maintainer
  [media] MAINTAINERS: add Michael Krufky as mxl5007t maintainer
  [media] MAINTAINERS: add Michael Krufky as tda18271 maintainer
  [media] s5p-tv: Report only multi-plane capabilities in vidioc_querycap
  [media] s5p-mfc: Fix misplaced return statement in s5p_mfc_suspend()
  [media] exynos-gsc: Add missing static storage class specifiers
  [media] exynos-gsc: Remove <linux/version.h> header file inclusion
  [media] s5p-fimc: Fix incorrect condition in fimc_lite_reqbufs()
  [media] s5p-tv: Fix potential NULL pointer dereference error
  [media] s5k6aa: Fix possible NULL pointer dereference
  ...

1 files changed, 186 insertions, 0 deletions

diff --git a/drivers/media/dvb-core/dvb_ringbuffer.h b/drivers/media/dvb-core/dvb_ringbuffer.h
new file mode 100644
index 00000000000..41f04dae69b
--- /dev/null
+++ b/drivers/media/dvb-core/dvb_ringbuffer.h
@@ -0,0 +1,186 @@
+/*
+ *
+ * dvb_ringbuffer.h: ring buffer implementation for the dvb driver
+ *
+ * Copyright (C) 2003 Oliver Endriss
+ * Copyright (C) 2004 Andrew de Quincey
+ *
+ * based on code originally found in av7110.c & dvb_ci.c:
+ * Copyright (C) 1999-2003 Ralph Metzler & Marcus Metzler
+ *                         for convergence integrated media GmbH
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public License
+ * as published by the Free Software Foundation; either version 2.1
+ * 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 Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
+ */
+
+#ifndef _DVB_RINGBUFFER_H_
+#define _DVB_RINGBUFFER_H_
+
+#include <linux/spinlock.h>
+#include <linux/wait.h>
+
+struct dvb_ringbuffer {
+	u8               *data;
+	ssize_t           size;
+	ssize_t           pread;
+	ssize_t           pwrite;
+	int               error;
+
+	wait_queue_head_t queue;
+	spinlock_t        lock;
+};
+
+#define DVB_RINGBUFFER_PKTHDRSIZE 3
+
+
+/*
+** Notes:
+** ------
+** (1) For performance reasons read and write routines don't check buffer sizes
+**     and/or number of bytes free/available. This has to be done before these
+**     routines are called. For example:
+**
+**     *** write <buflen> bytes ***
+**     free = dvb_ringbuffer_free(rbuf);
+**     if (free >= buflen)
+**         count = dvb_ringbuffer_write(rbuf, buffer, buflen);
+**     else
+**         ...
+**
+**     *** read min. 1000, max. <bufsize> bytes ***
+**     avail = dvb_ringbuffer_avail(rbuf);
+**     if (avail >= 1000)
+**         count = dvb_ringbuffer_read(rbuf, buffer, min(avail, bufsize));
+**     else
+**         ...
+**
+** (2) If there is exactly one reader and one writer, there is no need
+**     to lock read or write operations.
+**     Two or more readers must be locked against each other.
+**     Flushing the buffer counts as a read operation.
+**     Resetting the buffer counts as a read and write operation.
+**     Two or more writers must be locked against each other.
+*/
+
+/* initialize ring buffer, lock and queue */
+extern void dvb_ringbuffer_init(struct dvb_ringbuffer *rbuf, void *data, size_t len);
+
+/* test whether buffer is empty */
+extern int dvb_ringbuffer_empty(struct dvb_ringbuffer *rbuf);
+
+/* return the number of free bytes in the buffer */
+extern ssize_t dvb_ringbuffer_free(struct dvb_ringbuffer *rbuf);
+
+/* return the number of bytes waiting in the buffer */
+extern ssize_t dvb_ringbuffer_avail(struct dvb_ringbuffer *rbuf);
+
+
+/*
+** Reset the read and write pointers to zero and flush the buffer
+** This counts as a read and write operation
+*/
+extern void dvb_ringbuffer_reset(struct dvb_ringbuffer *rbuf);
+
+
+/* read routines & macros */
+/* ---------------------- */
+/* flush buffer */
+extern void dvb_ringbuffer_flush(struct dvb_ringbuffer *rbuf);
+
+/* flush buffer protected by spinlock and wake-up waiting task(s) */
+extern void dvb_ringbuffer_flush_spinlock_wakeup(struct dvb_ringbuffer *rbuf);
+
+/* peek at byte <offs> in the buffer */
+#define DVB_RINGBUFFER_PEEK(rbuf,offs)	\
+			(rbuf)->data[((rbuf)->pread+(offs))%(rbuf)->size]
+
+/* advance read ptr by <num> bytes */
+#define DVB_RINGBUFFER_SKIP(rbuf,num)	\
+			(rbuf)->pread=((rbuf)->pread+(num))%(rbuf)->size
+
+/*
+** read <len> bytes from ring buffer into <buf>
+** <usermem> specifies whether <buf> resides in user space
+** returns number of bytes transferred or -EFAULT
+*/
+extern ssize_t dvb_ringbuffer_read_user(struct dvb_ringbuffer *rbuf,
+				   u8 __user *buf, size_t len);
+extern void dvb_ringbuffer_read(struct dvb_ringbuffer *rbuf,
+				   u8 *buf, size_t len);
+
+
+/* write routines & macros */
+/* ----------------------- */
+/* write single byte to ring buffer */
+#define DVB_RINGBUFFER_WRITE_BYTE(rbuf,byte)	\
+			{ (rbuf)->data[(rbuf)->pwrite]=(byte); \
+			(rbuf)->pwrite=((rbuf)->pwrite+1)%(rbuf)->size; }
+/*
+** write <len> bytes to ring buffer
+** <usermem> specifies whether <buf> resides in user space
+** returns number of bytes transferred or -EFAULT
+*/
+extern ssize_t dvb_ringbuffer_write(struct dvb_ringbuffer *rbuf, const u8 *buf,
+				    size_t len);
+
+
+/**
+ * Write a packet into the ringbuffer.
+ *
+ * <rbuf> Ringbuffer to write to.
+ * <buf> Buffer to write.
+ * <len> Length of buffer (currently limited to 65535 bytes max).
+ * returns Number of bytes written, or -EFAULT, -ENOMEM, -EVINAL.
+ */
+extern ssize_t dvb_ringbuffer_pkt_write(struct dvb_ringbuffer *rbuf, u8* buf,
+					size_t len);
+
+/**
+ * Read from a packet in the ringbuffer. Note: unlike dvb_ringbuffer_read(), this
+ * does NOT update the read pointer in the ringbuffer. You must use
+ * dvb_ringbuffer_pkt_dispose() to mark a packet as no longer required.
+ *
+ * <rbuf> Ringbuffer concerned.
+ * <idx> Packet index as returned by dvb_ringbuffer_pkt_next().
+ * <offset> Offset into packet to read from.
+ * <buf> Destination buffer for data.
+ * <len> Size of destination buffer.
+ * <usermem> Set to 1 if <buf> is in userspace.
+ * returns Number of bytes read, or -EFAULT.
+ */
+extern ssize_t dvb_ringbuffer_pkt_read_user(struct dvb_ringbuffer *rbuf, size_t idx,
+				       int offset, u8 __user *buf, size_t len);
+extern ssize_t dvb_ringbuffer_pkt_read(struct dvb_ringbuffer *rbuf, size_t idx,
+				       int offset, u8 *buf, size_t len);
+
+/**
+ * Dispose of a packet in the ring buffer.
+ *
+ * <rbuf> Ring buffer concerned.
+ * <idx> Packet index as returned by dvb_ringbuffer_pkt_next().
+ */
+extern void dvb_ringbuffer_pkt_dispose(struct dvb_ringbuffer *rbuf, size_t idx);
+
+/**
+ * Get the index of the next packet in a ringbuffer.
+ *
+ * <rbuf> Ringbuffer concerned.
+ * <idx> Previous packet index, or -1 to return the first packet index.
+ * <pktlen> On success, will be updated to contain the length of the packet in bytes.
+ * returns Packet index (if >=0), or -1 if no packets available.
+ */
+extern ssize_t dvb_ringbuffer_pkt_next(struct dvb_ringbuffer *rbuf, size_t idx, size_t* pktlen);
+
+
+#endif /* _DVB_RINGBUFFER_H_ */