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, 475 insertions, 0 deletions

diff --git a/drivers/media/pci/saa7164/saa7164-bus.c b/drivers/media/pci/saa7164/saa7164-bus.c
new file mode 100644
index 0000000..a7f58a9
--- /dev/null
+++ b/drivers/media/pci/saa7164/saa7164-bus.c
@@ -0,0 +1,475 @@
+/*
+ *  Driver for the NXP SAA7164 PCIe bridge
+ *
+ *  Copyright (c) 2010 Steven Toth <stoth@kernellabs.com>
+ *
+ *  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.
+ */
+
+#include "saa7164.h"
+
+/* The message bus to/from the firmware is a ring buffer in PCI address
+ * space. Establish the defaults.
+ */
+int saa7164_bus_setup(struct saa7164_dev *dev)
+{
+	struct tmComResBusInfo *b	= &dev->bus;
+
+	mutex_init(&b->lock);
+
+	b->Type			= TYPE_BUS_PCIe;
+	b->m_wMaxReqSize	= SAA_DEVICE_MAXREQUESTSIZE;
+
+	b->m_pdwSetRing		= (u8 *)(dev->bmmio +
+		((u32)dev->busdesc.CommandRing));
+
+	b->m_dwSizeSetRing	= SAA_DEVICE_BUFFERBLOCKSIZE;
+
+	b->m_pdwGetRing		= (u8 *)(dev->bmmio +
+		((u32)dev->busdesc.ResponseRing));
+
+	b->m_dwSizeGetRing	= SAA_DEVICE_BUFFERBLOCKSIZE;
+
+	b->m_dwSetWritePos	= ((u32)dev->intfdesc.BARLocation) +
+		(2 * sizeof(u64));
+	b->m_dwSetReadPos	= b->m_dwSetWritePos + (1 * sizeof(u32));
+
+	b->m_dwGetWritePos	= b->m_dwSetWritePos + (2 * sizeof(u32));
+	b->m_dwGetReadPos	= b->m_dwSetWritePos + (3 * sizeof(u32));
+
+	return 0;
+}
+
+void saa7164_bus_dump(struct saa7164_dev *dev)
+{
+	struct tmComResBusInfo *b = &dev->bus;
+
+	dprintk(DBGLVL_BUS, "Dumping the bus structure:\n");
+	dprintk(DBGLVL_BUS, " .type             = %d\n", b->Type);
+	dprintk(DBGLVL_BUS, " .dev->bmmio       = 0x%p\n", dev->bmmio);
+	dprintk(DBGLVL_BUS, " .m_wMaxReqSize    = 0x%x\n", b->m_wMaxReqSize);
+	dprintk(DBGLVL_BUS, " .m_pdwSetRing     = 0x%p\n", b->m_pdwSetRing);
+	dprintk(DBGLVL_BUS, " .m_dwSizeSetRing  = 0x%x\n", b->m_dwSizeSetRing);
+	dprintk(DBGLVL_BUS, " .m_pdwGetRing     = 0x%p\n", b->m_pdwGetRing);
+	dprintk(DBGLVL_BUS, " .m_dwSizeGetRing  = 0x%x\n", b->m_dwSizeGetRing);
+
+	dprintk(DBGLVL_BUS, " .m_dwSetReadPos   = 0x%x (0x%08x)\n",
+		b->m_dwSetReadPos, saa7164_readl(b->m_dwSetReadPos));
+
+	dprintk(DBGLVL_BUS, " .m_dwSetWritePos  = 0x%x (0x%08x)\n",
+		b->m_dwSetWritePos, saa7164_readl(b->m_dwSetWritePos));
+
+	dprintk(DBGLVL_BUS, " .m_dwGetReadPos   = 0x%x (0x%08x)\n",
+		b->m_dwGetReadPos, saa7164_readl(b->m_dwGetReadPos));
+
+	dprintk(DBGLVL_BUS, " .m_dwGetWritePos  = 0x%x (0x%08x)\n",
+		b->m_dwGetWritePos, saa7164_readl(b->m_dwGetWritePos));
+
+}
+
+/* Intensionally throw a BUG() if the state of the message bus looks corrupt */
+void saa7164_bus_verify(struct saa7164_dev *dev)
+{
+	struct tmComResBusInfo *b = &dev->bus;
+	int bug = 0;
+
+	if (saa7164_readl(b->m_dwSetReadPos) > b->m_dwSizeSetRing)
+		bug++;
+
+	if (saa7164_readl(b->m_dwSetWritePos) > b->m_dwSizeSetRing)
+		bug++;
+
+	if (saa7164_readl(b->m_dwGetReadPos) > b->m_dwSizeGetRing)
+		bug++;
+
+	if (saa7164_readl(b->m_dwGetWritePos) > b->m_dwSizeGetRing)
+		bug++;
+
+	if (bug) {
+		saa_debug = 0xffff; /* Ensure we get the bus dump */
+		saa7164_bus_dump(dev);
+		saa_debug = 1024; /* Ensure we get the bus dump */
+		BUG();
+	}
+}
+
+void saa7164_bus_dumpmsg(struct saa7164_dev *dev, struct tmComResInfo* m,
+	void *buf)
+{
+	dprintk(DBGLVL_BUS, "Dumping msg structure:\n");
+	dprintk(DBGLVL_BUS, " .id               = %d\n",   m->id);
+	dprintk(DBGLVL_BUS, " .flags            = 0x%x\n", m->flags);
+	dprintk(DBGLVL_BUS, " .size             = 0x%x\n", m->size);
+	dprintk(DBGLVL_BUS, " .command          = 0x%x\n", m->command);
+	dprintk(DBGLVL_BUS, " .controlselector  = 0x%x\n", m->controlselector);
+	dprintk(DBGLVL_BUS, " .seqno            = %d\n",   m->seqno);
+	if (buf)
+		dprintk(DBGLVL_BUS, " .buffer (ignored)\n");
+}
+
+/*
+ * Places a command or a response on the bus. The implementation does not
+ * know if it is a command or a response it just places the data on the
+ * bus depending on the bus information given in the struct tmComResBusInfo
+ * structure. If the command or response does not fit into the bus ring
+ * buffer it will be refused.
+ *
+ * Return Value:
+ *  SAA_OK     The function executed successfully.
+ *  < 0        One or more members are not initialized.
+ */
+int saa7164_bus_set(struct saa7164_dev *dev, struct tmComResInfo* msg,
+	void *buf)
+{
+	struct tmComResBusInfo *bus = &dev->bus;
+	u32 bytes_to_write, free_write_space, timeout, curr_srp, curr_swp;
+	u32 new_swp, space_rem;
+	int ret = SAA_ERR_BAD_PARAMETER;
+
+	if (!msg) {
+		printk(KERN_ERR "%s() !msg\n", __func__);
+		return SAA_ERR_BAD_PARAMETER;
+	}
+
+	dprintk(DBGLVL_BUS, "%s()\n", __func__);
+
+	saa7164_bus_verify(dev);
+
+	msg->size = cpu_to_le16(msg->size);
+	msg->command = cpu_to_le32(msg->command);
+	msg->controlselector = cpu_to_le16(msg->controlselector);
+
+	if (msg->size > dev->bus.m_wMaxReqSize) {
+		printk(KERN_ERR "%s() Exceeded dev->bus.m_wMaxReqSize\n",
+			__func__);
+		return SAA_ERR_BAD_PARAMETER;
+	}
+
+	if ((msg->size > 0) && (buf == NULL)) {
+		printk(KERN_ERR "%s() Missing message buffer\n", __func__);
+		return SAA_ERR_BAD_PARAMETER;
+	}
+
+	/* Lock the bus from any other access */
+	mutex_lock(&bus->lock);
+
+	bytes_to_write = sizeof(*msg) + msg->size;
+	free_write_space = 0;
+	timeout = SAA_BUS_TIMEOUT;
+	curr_srp = le32_to_cpu(saa7164_readl(bus->m_dwSetReadPos));
+	curr_swp = le32_to_cpu(saa7164_readl(bus->m_dwSetWritePos));
+
+	/* Deal with ring wrapping issues */
+	if (curr_srp > curr_swp)
+		/* Deal with the wrapped ring */
+		free_write_space = curr_srp - curr_swp;
+	else
+		/* The ring has not wrapped yet */
+		free_write_space = (curr_srp + bus->m_dwSizeSetRing) - curr_swp;
+
+	dprintk(DBGLVL_BUS, "%s() bytes_to_write = %d\n", __func__,
+		bytes_to_write);
+
+	dprintk(DBGLVL_BUS, "%s() free_write_space = %d\n", __func__,
+		free_write_space);
+
+	dprintk(DBGLVL_BUS, "%s() curr_srp = %x\n", __func__, curr_srp);
+	dprintk(DBGLVL_BUS, "%s() curr_swp = %x\n", __func__, curr_swp);
+
+	/* Process the msg and write the content onto the bus */
+	while (bytes_to_write >= free_write_space) {
+
+		if (timeout-- == 0) {
+			printk(KERN_ERR "%s() bus timeout\n", __func__);
+			ret = SAA_ERR_NO_RESOURCES;
+			goto out;
+		}
+
+		/* TODO: Review this delay, efficient? */
+		/* Wait, allowing the hardware fetch time */
+		mdelay(1);
+
+		/* Check the space usage again */
+		curr_srp = le32_to_cpu(saa7164_readl(bus->m_dwSetReadPos));
+
+		/* Deal with ring wrapping issues */
+		if (curr_srp > curr_swp)
+			/* Deal with the wrapped ring */
+			free_write_space = curr_srp - curr_swp;
+		else
+			/* Read didn't wrap around the buffer */
+			free_write_space = (curr_srp + bus->m_dwSizeSetRing) -
+				curr_swp;
+
+	}
+
+	/* Calculate the new write position */
+	new_swp = curr_swp + bytes_to_write;
+
+	dprintk(DBGLVL_BUS, "%s() new_swp = %x\n", __func__, new_swp);
+	dprintk(DBGLVL_BUS, "%s() bus->m_dwSizeSetRing = %x\n", __func__,
+		bus->m_dwSizeSetRing);
+
+	/* Mental Note: line 462 tmmhComResBusPCIe.cpp */
+
+	/* Check if we're going to wrap again */
+	if (new_swp > bus->m_dwSizeSetRing) {
+
+		/* Ring wraps */
+		new_swp -= bus->m_dwSizeSetRing;
+
+		space_rem = bus->m_dwSizeSetRing - curr_swp;
+
+		dprintk(DBGLVL_BUS, "%s() space_rem = %x\n", __func__,
+			space_rem);
+
+		dprintk(DBGLVL_BUS, "%s() sizeof(*msg) = %d\n", __func__,
+			(u32)sizeof(*msg));
+
+		if (space_rem < sizeof(*msg)) {
+			dprintk(DBGLVL_BUS, "%s() tr4\n", __func__);
+
+			/* Split the msg into pieces as the ring wraps */
+			memcpy(bus->m_pdwSetRing + curr_swp, msg, space_rem);
+			memcpy(bus->m_pdwSetRing, (u8 *)msg + space_rem,
+				sizeof(*msg) - space_rem);
+
+			memcpy(bus->m_pdwSetRing + sizeof(*msg) - space_rem,
+				buf, msg->size);
+
+		} else if (space_rem == sizeof(*msg)) {
+			dprintk(DBGLVL_BUS, "%s() tr5\n", __func__);
+
+			/* Additional data at the beginning of the ring */
+			memcpy(bus->m_pdwSetRing + curr_swp, msg, sizeof(*msg));
+			memcpy(bus->m_pdwSetRing, buf, msg->size);
+
+		} else {
+			/* Additional data wraps around the ring */
+			memcpy(bus->m_pdwSetRing + curr_swp, msg, sizeof(*msg));
+			if (msg->size > 0) {
+				memcpy(bus->m_pdwSetRing + curr_swp +
+					sizeof(*msg), buf, space_rem -
+					sizeof(*msg));
+				memcpy(bus->m_pdwSetRing, (u8 *)buf +
+					space_rem - sizeof(*msg),
+					bytes_to_write - space_rem);
+			}
+
+		}
+
+	} /* (new_swp > bus->m_dwSizeSetRing) */
+	else {
+		dprintk(DBGLVL_BUS, "%s() tr6\n", __func__);
+
+		/* The ring buffer doesn't wrap, two simple copies */
+		memcpy(bus->m_pdwSetRing + curr_swp, msg, sizeof(*msg));
+		memcpy(bus->m_pdwSetRing + curr_swp + sizeof(*msg), buf,
+			msg->size);
+	}
+
+	dprintk(DBGLVL_BUS, "%s() new_swp = %x\n", __func__, new_swp);
+
+	/* Update the bus write position */
+	saa7164_writel(bus->m_dwSetWritePos, cpu_to_le32(new_swp));
+	ret = SAA_OK;
+
+out:
+	saa7164_bus_dump(dev);
+	mutex_unlock(&bus->lock);
+	saa7164_bus_verify(dev);
+	return ret;
+}
+
+/*
+ * Receive a command or a response from the bus. The implementation does not
+ * know if it is a command or a response it simply dequeues the data,
+ * depending on the bus information given in the struct tmComResBusInfo
+ * structure.
+ *
+ * Return Value:
+ *  0          The function executed successfully.
+ *  < 0        One or more members are not initialized.
+ */
+int saa7164_bus_get(struct saa7164_dev *dev, struct tmComResInfo* msg,
+	void *buf, int peekonly)
+{
+	struct tmComResBusInfo *bus = &dev->bus;
+	u32 bytes_to_read, write_distance, curr_grp, curr_gwp,
+		new_grp, buf_size, space_rem;
+	struct tmComResInfo msg_tmp;
+	int ret = SAA_ERR_BAD_PARAMETER;
+
+	saa7164_bus_verify(dev);
+
+	if (msg == NULL)
+		return ret;
+
+	if (msg->size > dev->bus.m_wMaxReqSize) {
+		printk(KERN_ERR "%s() Exceeded dev->bus.m_wMaxReqSize\n",
+			__func__);
+		return ret;
+	}
+
+	if ((peekonly == 0) && (msg->size > 0) && (buf == NULL)) {
+		printk(KERN_ERR
+			"%s() Missing msg buf, size should be %d bytes\n",
+			__func__, msg->size);
+		return ret;
+	}
+
+	mutex_lock(&bus->lock);
+
+	/* Peek the bus to see if a msg exists, if it's not what we're expecting
+	 * then return cleanly else read the message from the bus.
+	 */
+	curr_gwp = le32_to_cpu(saa7164_readl(bus->m_dwGetWritePos));
+	curr_grp = le32_to_cpu(saa7164_readl(bus->m_dwGetReadPos));
+
+	if (curr_gwp == curr_grp) {
+		ret = SAA_ERR_EMPTY;
+		goto out;
+	}
+
+	bytes_to_read = sizeof(*msg);
+
+	/* Calculate write distance to current read position */
+	write_distance = 0;
+	if (curr_gwp >= curr_grp)
+		/* Write doesn't wrap around the ring */
+		write_distance = curr_gwp - curr_grp;
+	else
+		/* Write wraps around the ring */
+		write_distance = curr_gwp + bus->m_dwSizeGetRing - curr_grp;
+
+	if (bytes_to_read > write_distance) {
+		printk(KERN_ERR "%s() No message/response found\n", __func__);
+		ret = SAA_ERR_INVALID_COMMAND;
+		goto out;
+	}
+
+	/* Calculate the new read position */
+	new_grp = curr_grp + bytes_to_read;
+	if (new_grp > bus->m_dwSizeGetRing) {
+
+		/* Ring wraps */
+		new_grp -= bus->m_dwSizeGetRing;
+		space_rem = bus->m_dwSizeGetRing - curr_grp;
+
+		memcpy(&msg_tmp, bus->m_pdwGetRing + curr_grp, space_rem);
+		memcpy((u8 *)&msg_tmp + space_rem, bus->m_pdwGetRing,
+			bytes_to_read - space_rem);
+
+	} else {
+		/* No wrapping */
+		memcpy(&msg_tmp, bus->m_pdwGetRing + curr_grp, bytes_to_read);
+	}
+
+	/* No need to update the read positions, because this was a peek */
+	/* If the caller specifically want to peek, return */
+	if (peekonly) {
+		memcpy(msg, &msg_tmp, sizeof(*msg));
+		goto peekout;
+	}
+
+	/* Check if the command/response matches what is expected */
+	if ((msg_tmp.id != msg->id) || (msg_tmp.command != msg->command) ||
+		(msg_tmp.controlselector != msg->controlselector) ||
+		(msg_tmp.seqno != msg->seqno) || (msg_tmp.size != msg->size)) {
+
+		printk(KERN_ERR "%s() Unexpected msg miss-match\n", __func__);
+		saa7164_bus_dumpmsg(dev, msg, buf);
+		saa7164_bus_dumpmsg(dev, &msg_tmp, NULL);
+		ret = SAA_ERR_INVALID_COMMAND;
+		goto out;
+	}
+
+	/* Get the actual command and response from the bus */
+	buf_size = msg->size;
+
+	bytes_to_read = sizeof(*msg) + msg->size;
+	/* Calculate write distance to current read position */
+	write_distance = 0;
+	if (curr_gwp >= curr_grp)
+		/* Write doesn't wrap around the ring */
+		write_distance = curr_gwp - curr_grp;
+	else
+		/* Write wraps around the ring */
+		write_distance = curr_gwp + bus->m_dwSizeGetRing - curr_grp;
+
+	if (bytes_to_read > write_distance) {
+		printk(KERN_ERR "%s() Invalid bus state, missing msg "
+			"or mangled ring, faulty H/W / bad code?\n", __func__);
+		ret = SAA_ERR_INVALID_COMMAND;
+		goto out;
+	}
+
+	/* Calculate the new read position */
+	new_grp = curr_grp + bytes_to_read;
+	if (new_grp > bus->m_dwSizeGetRing) {
+
+		/* Ring wraps */
+		new_grp -= bus->m_dwSizeGetRing;
+		space_rem = bus->m_dwSizeGetRing - curr_grp;
+
+		if (space_rem < sizeof(*msg)) {
+			/* msg wraps around the ring */
+			memcpy(msg, bus->m_pdwGetRing + curr_grp, space_rem);
+			memcpy((u8 *)msg + space_rem, bus->m_pdwGetRing,
+				sizeof(*msg) - space_rem);
+			if (buf)
+				memcpy(buf, bus->m_pdwGetRing + sizeof(*msg) -
+					space_rem, buf_size);
+
+		} else if (space_rem == sizeof(*msg)) {
+			memcpy(msg, bus->m_pdwGetRing + curr_grp, sizeof(*msg));
+			if (buf)
+				memcpy(buf, bus->m_pdwGetRing, buf_size);
+		} else {
+			/* Additional data wraps around the ring */
+			memcpy(msg, bus->m_pdwGetRing + curr_grp, sizeof(*msg));
+			if (buf) {
+				memcpy(buf, bus->m_pdwGetRing + curr_grp +
+					sizeof(*msg), space_rem - sizeof(*msg));
+				memcpy(buf + space_rem - sizeof(*msg),
+					bus->m_pdwGetRing, bytes_to_read -
+					space_rem);
+			}
+
+		}
+
+	} else {
+		/* No wrapping */
+		memcpy(msg, bus->m_pdwGetRing + curr_grp, sizeof(*msg));
+		if (buf)
+			memcpy(buf, bus->m_pdwGetRing + curr_grp + sizeof(*msg),
+				buf_size);
+	}
+
+	/* Update the read positions, adjusting the ring */
+	saa7164_writel(bus->m_dwGetReadPos, cpu_to_le32(new_grp));
+
+peekout:
+	msg->size = le16_to_cpu(msg->size);
+	msg->command = le32_to_cpu(msg->command);
+	msg->controlselector = le16_to_cpu(msg->controlselector);
+	ret = SAA_OK;
+out:
+	mutex_unlock(&bus->lock);
+	saa7164_bus_verify(dev);
+	return ret;
+}
+