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, 850 insertions, 0 deletions

diff --git a/drivers/media/usb/dvb-usb-v2/mxl111sf-i2c.c b/drivers/media/usb/dvb-usb-v2/mxl111sf-i2c.c
new file mode 100644
index 000000000000..34434557ef65
--- /dev/null
+++ b/drivers/media/usb/dvb-usb-v2/mxl111sf-i2c.c
@@ -0,0 +1,850 @@
+/*
+ *  mxl111sf-i2c.c - driver for the MaxLinear MXL111SF
+ *
+ *  Copyright (C) 2010 Michael Krufky <mkrufky@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 "mxl111sf-i2c.h"
+#include "mxl111sf.h"
+
+/* SW-I2C ----------------------------------------------------------------- */
+
+#define SW_I2C_ADDR		0x1a
+#define SW_I2C_EN		0x02
+#define SW_SCL_OUT		0x04
+#define SW_SDA_OUT		0x08
+#define SW_SDA_IN		0x04
+
+#define SW_I2C_BUSY_ADDR	0x2f
+#define SW_I2C_BUSY		0x02
+
+static int mxl111sf_i2c_bitbang_sendbyte(struct mxl111sf_state *state,
+					 u8 byte)
+{
+	int i, ret;
+	u8 data = 0;
+
+	mxl_i2c("(0x%02x)", byte);
+
+	ret = mxl111sf_read_reg(state, SW_I2C_BUSY_ADDR, &data);
+	if (mxl_fail(ret))
+		goto fail;
+
+	for (i = 0; i < 8; i++) {
+
+		data = (byte & (0x80 >> i)) ? SW_SDA_OUT : 0;
+
+		ret = mxl111sf_write_reg(state, SW_I2C_ADDR,
+					 0x10 | SW_I2C_EN | data);
+		if (mxl_fail(ret))
+			goto fail;
+
+		ret = mxl111sf_write_reg(state, SW_I2C_ADDR,
+					 0x10 | SW_I2C_EN | data | SW_SCL_OUT);
+		if (mxl_fail(ret))
+			goto fail;
+
+		ret = mxl111sf_write_reg(state, SW_I2C_ADDR,
+					 0x10 | SW_I2C_EN | data);
+		if (mxl_fail(ret))
+			goto fail;
+	}
+
+	/* last bit was 0 so we need to release SDA */
+	if (!(byte & 1)) {
+		ret = mxl111sf_write_reg(state, SW_I2C_ADDR,
+					 0x10 | SW_I2C_EN | SW_SDA_OUT);
+		if (mxl_fail(ret))
+			goto fail;
+	}
+
+	/* CLK high for ACK readback */
+	ret = mxl111sf_write_reg(state, SW_I2C_ADDR,
+				 0x10 | SW_I2C_EN | SW_SCL_OUT | SW_SDA_OUT);
+	if (mxl_fail(ret))
+		goto fail;
+
+	ret = mxl111sf_read_reg(state, SW_I2C_BUSY_ADDR, &data);
+	if (mxl_fail(ret))
+		goto fail;
+
+	/* drop the CLK after getting ACK, SDA will go high right away */
+	ret = mxl111sf_write_reg(state, SW_I2C_ADDR,
+				 0x10 | SW_I2C_EN | SW_SDA_OUT);
+	if (mxl_fail(ret))
+		goto fail;
+
+	if (data & SW_SDA_IN)
+		ret = -EIO;
+fail:
+	return ret;
+}
+
+static int mxl111sf_i2c_bitbang_recvbyte(struct mxl111sf_state *state,
+					 u8 *pbyte)
+{
+	int i, ret;
+	u8 byte = 0;
+	u8 data = 0;
+
+	mxl_i2c("()");
+
+	*pbyte = 0;
+
+	ret = mxl111sf_write_reg(state, SW_I2C_ADDR,
+				 0x10 | SW_I2C_EN | SW_SDA_OUT);
+	if (mxl_fail(ret))
+		goto fail;
+
+	for (i = 0; i < 8; i++) {
+		ret = mxl111sf_write_reg(state, SW_I2C_ADDR,
+					 0x10 | SW_I2C_EN |
+					 SW_SCL_OUT | SW_SDA_OUT);
+		if (mxl_fail(ret))
+			goto fail;
+
+		ret = mxl111sf_read_reg(state, SW_I2C_BUSY_ADDR, &data);
+		if (mxl_fail(ret))
+			goto fail;
+
+		if (data & SW_SDA_IN)
+			byte |= (0x80 >> i);
+
+		ret = mxl111sf_write_reg(state, SW_I2C_ADDR,
+					 0x10 | SW_I2C_EN | SW_SDA_OUT);
+		if (mxl_fail(ret))
+			goto fail;
+	}
+	*pbyte = byte;
+fail:
+	return ret;
+}
+
+static int mxl111sf_i2c_start(struct mxl111sf_state *state)
+{
+	int ret;
+
+	mxl_i2c("()");
+
+	ret = mxl111sf_write_reg(state, SW_I2C_ADDR,
+				 0x10 | SW_I2C_EN | SW_SCL_OUT | SW_SDA_OUT);
+	if (mxl_fail(ret))
+		goto fail;
+
+	ret = mxl111sf_write_reg(state, SW_I2C_ADDR,
+				 0x10 | SW_I2C_EN | SW_SCL_OUT);
+	if (mxl_fail(ret))
+		goto fail;
+
+	ret = mxl111sf_write_reg(state, SW_I2C_ADDR,
+				 0x10 | SW_I2C_EN); /* start */
+	mxl_fail(ret);
+fail:
+	return ret;
+}
+
+static int mxl111sf_i2c_stop(struct mxl111sf_state *state)
+{
+	int ret;
+
+	mxl_i2c("()");
+
+	ret = mxl111sf_write_reg(state, SW_I2C_ADDR,
+				 0x10 | SW_I2C_EN); /* stop */
+	if (mxl_fail(ret))
+		goto fail;
+
+	ret = mxl111sf_write_reg(state, SW_I2C_ADDR,
+				 0x10 | SW_I2C_EN | SW_SCL_OUT);
+	if (mxl_fail(ret))
+		goto fail;
+
+	ret = mxl111sf_write_reg(state, SW_I2C_ADDR,
+				 0x10 | SW_I2C_EN | SW_SCL_OUT | SW_SDA_OUT);
+	if (mxl_fail(ret))
+		goto fail;
+
+	ret = mxl111sf_write_reg(state, SW_I2C_ADDR,
+				 0x10 | SW_SCL_OUT | SW_SDA_OUT);
+	mxl_fail(ret);
+fail:
+	return ret;
+}
+
+static int mxl111sf_i2c_ack(struct mxl111sf_state *state)
+{
+	int ret;
+	u8 b = 0;
+
+	mxl_i2c("()");
+
+	ret = mxl111sf_read_reg(state, SW_I2C_BUSY_ADDR, &b);
+	if (mxl_fail(ret))
+		goto fail;
+
+	ret = mxl111sf_write_reg(state, SW_I2C_ADDR,
+				 0x10 | SW_I2C_EN);
+	if (mxl_fail(ret))
+		goto fail;
+
+	/* pull SDA low */
+	ret = mxl111sf_write_reg(state, SW_I2C_ADDR,
+				 0x10 | SW_I2C_EN | SW_SCL_OUT);
+	if (mxl_fail(ret))
+		goto fail;
+
+	ret = mxl111sf_write_reg(state, SW_I2C_ADDR,
+				 0x10 | SW_I2C_EN | SW_SDA_OUT);
+	mxl_fail(ret);
+fail:
+	return ret;
+}
+
+static int mxl111sf_i2c_nack(struct mxl111sf_state *state)
+{
+	int ret;
+
+	mxl_i2c("()");
+
+	/* SDA high to signal last byte read from slave */
+	ret = mxl111sf_write_reg(state, SW_I2C_ADDR,
+				 0x10 | SW_I2C_EN | SW_SCL_OUT | SW_SDA_OUT);
+	if (mxl_fail(ret))
+		goto fail;
+
+	ret = mxl111sf_write_reg(state, SW_I2C_ADDR,
+				 0x10 | SW_I2C_EN | SW_SDA_OUT);
+	mxl_fail(ret);
+fail:
+	return ret;
+}
+
+/* ------------------------------------------------------------------------ */
+
+static int mxl111sf_i2c_sw_xfer_msg(struct mxl111sf_state *state,
+				    struct i2c_msg *msg)
+{
+	int i, ret;
+
+	mxl_i2c("()");
+
+	if (msg->flags & I2C_M_RD) {
+
+		ret = mxl111sf_i2c_start(state);
+		if (mxl_fail(ret))
+			goto fail;
+
+		ret = mxl111sf_i2c_bitbang_sendbyte(state,
+						    (msg->addr << 1) | 0x01);
+		if (mxl_fail(ret)) {
+			mxl111sf_i2c_stop(state);
+			goto fail;
+		}
+
+		for (i = 0; i < msg->len; i++) {
+			ret = mxl111sf_i2c_bitbang_recvbyte(state,
+							    &msg->buf[i]);
+			if (mxl_fail(ret)) {
+				mxl111sf_i2c_stop(state);
+				goto fail;
+			}
+
+			if (i < msg->len - 1)
+				mxl111sf_i2c_ack(state);
+		}
+
+		mxl111sf_i2c_nack(state);
+
+		ret = mxl111sf_i2c_stop(state);
+		if (mxl_fail(ret))
+			goto fail;
+
+	} else {
+
+		ret = mxl111sf_i2c_start(state);
+		if (mxl_fail(ret))
+			goto fail;
+
+		ret = mxl111sf_i2c_bitbang_sendbyte(state,
+						    (msg->addr << 1) & 0xfe);
+		if (mxl_fail(ret)) {
+			mxl111sf_i2c_stop(state);
+			goto fail;
+		}
+
+		for (i = 0; i < msg->len; i++) {
+			ret = mxl111sf_i2c_bitbang_sendbyte(state,
+							    msg->buf[i]);
+			if (mxl_fail(ret)) {
+				mxl111sf_i2c_stop(state);
+				goto fail;
+			}
+		}
+
+		/* FIXME: we only want to do this on the last transaction */
+		mxl111sf_i2c_stop(state);
+	}
+fail:
+	return ret;
+}
+
+/* HW-I2C ----------------------------------------------------------------- */
+
+#define USB_WRITE_I2C_CMD     0x99
+#define USB_READ_I2C_CMD      0xdd
+#define USB_END_I2C_CMD       0xfe
+
+#define USB_WRITE_I2C_CMD_LEN   26
+#define USB_READ_I2C_CMD_LEN    24
+
+#define I2C_MUX_REG           0x30
+#define I2C_CONTROL_REG       0x00
+#define I2C_SLAVE_ADDR_REG    0x08
+#define I2C_DATA_REG          0x0c
+#define I2C_INT_STATUS_REG    0x10
+
+static int mxl111sf_i2c_send_data(struct mxl111sf_state *state,
+				  u8 index, u8 *wdata)
+{
+	int ret = mxl111sf_ctrl_msg(state->d, wdata[0],
+				    &wdata[1], 25, NULL, 0);
+	mxl_fail(ret);
+
+	return ret;
+}
+
+static int mxl111sf_i2c_get_data(struct mxl111sf_state *state,
+				 u8 index, u8 *wdata, u8 *rdata)
+{
+	int ret = mxl111sf_ctrl_msg(state->d, wdata[0],
+				    &wdata[1], 25, rdata, 24);
+	mxl_fail(ret);
+
+	return ret;
+}
+
+static u8 mxl111sf_i2c_check_status(struct mxl111sf_state *state)
+{
+	u8 status = 0;
+	u8 buf[26];
+
+	mxl_i2c_adv("()");
+
+	buf[0] = USB_READ_I2C_CMD;
+	buf[1] = 0x00;
+
+	buf[2] = I2C_INT_STATUS_REG;
+	buf[3] = 0x00;
+	buf[4] = 0x00;
+
+	buf[5] = USB_END_I2C_CMD;
+
+	mxl111sf_i2c_get_data(state, 0, buf, buf);
+
+	if (buf[1] & 0x04)
+		status = 1;
+
+	return status;
+}
+
+static u8 mxl111sf_i2c_check_fifo(struct mxl111sf_state *state)
+{
+	u8 status = 0;
+	u8 buf[26];
+
+	mxl_i2c("()");
+
+	buf[0] = USB_READ_I2C_CMD;
+	buf[1] = 0x00;
+
+	buf[2] = I2C_MUX_REG;
+	buf[3] = 0x00;
+	buf[4] = 0x00;
+
+	buf[5] = I2C_INT_STATUS_REG;
+	buf[6] = 0x00;
+	buf[7] = 0x00;
+	buf[8] = USB_END_I2C_CMD;
+
+	mxl111sf_i2c_get_data(state, 0, buf, buf);
+
+	if (0x08 == (buf[1] & 0x08))
+		status = 1;
+
+	if ((buf[5] & 0x02) == 0x02)
+		mxl_i2c("(buf[5] & 0x02) == 0x02"); /* FIXME */
+
+	return status;
+}
+
+static int mxl111sf_i2c_readagain(struct mxl111sf_state *state,
+				  u8 count, u8 *rbuf)
+{
+	u8 i2c_w_data[26];
+	u8 i2c_r_data[24];
+	u8 i = 0;
+	u8 fifo_status = 0;
+	int status = 0;
+
+	mxl_i2c("read %d bytes", count);
+
+	while ((fifo_status == 0) && (i++ < 5))
+		fifo_status = mxl111sf_i2c_check_fifo(state);
+
+	i2c_w_data[0] = 0xDD;
+	i2c_w_data[1] = 0x00;
+
+	for (i = 2; i < 26; i++)
+		i2c_w_data[i] = 0xFE;
+
+	for (i = 0; i < count; i++) {
+		i2c_w_data[2+(i*3)] = 0x0C;
+		i2c_w_data[3+(i*3)] = 0x00;
+		i2c_w_data[4+(i*3)] = 0x00;
+	}
+
+	mxl111sf_i2c_get_data(state, 0, i2c_w_data, i2c_r_data);
+
+	/* Check for I2C NACK status */
+	if (mxl111sf_i2c_check_status(state) == 1) {
+		mxl_i2c("error!");
+	} else {
+		for (i = 0; i < count; i++) {
+			rbuf[i] = i2c_r_data[(i*3)+1];
+			mxl_i2c("%02x\t %02x",
+				i2c_r_data[(i*3)+1],
+				i2c_r_data[(i*3)+2]);
+		}
+
+		status = 1;
+	}
+
+	return status;
+}
+
+#define HWI2C400 1
+static int mxl111sf_i2c_hw_xfer_msg(struct mxl111sf_state *state,
+				    struct i2c_msg *msg)
+{
+	int i, k, ret = 0;
+	u16 index = 0;
+	u8 buf[26];
+	u8 i2c_r_data[24];
+	u16 block_len;
+	u16 left_over_len;
+	u8 rd_status[8];
+	u8 ret_status;
+	u8 readbuff[26];
+
+	mxl_i2c("addr: 0x%02x, read buff len: %d, write buff len: %d",
+		msg->addr, (msg->flags & I2C_M_RD) ? msg->len : 0,
+		(!(msg->flags & I2C_M_RD)) ? msg->len : 0);
+
+	for (index = 0; index < 26; index++)
+		buf[index] = USB_END_I2C_CMD;
+
+	/* command to indicate data payload is destined for I2C interface */
+	buf[0] = USB_WRITE_I2C_CMD;
+	buf[1] = 0x00;
+
+	/* enable I2C interface */
+	buf[2] = I2C_MUX_REG;
+	buf[3] = 0x80;
+	buf[4] = 0x00;
+
+	/* enable I2C interface */
+	buf[5] = I2C_MUX_REG;
+	buf[6] = 0x81;
+	buf[7] = 0x00;
+
+	/* set Timeout register on I2C interface */
+	buf[8] = 0x14;
+	buf[9] = 0xff;
+	buf[10] = 0x00;
+#if 0
+	/* enable Interrupts on I2C interface */
+	buf[8] = 0x24;
+	buf[9] = 0xF7;
+	buf[10] = 0x00;
+#endif
+	buf[11] = 0x24;
+	buf[12] = 0xF7;
+	buf[13] = 0x00;
+
+	ret = mxl111sf_i2c_send_data(state, 0, buf);
+
+	/* write data on I2C bus */
+	if (!(msg->flags & I2C_M_RD) && (msg->len > 0)) {
+		mxl_i2c("%d\t%02x", msg->len, msg->buf[0]);
+
+		/* control register on I2C interface to initialize I2C bus */
+		buf[2] = I2C_CONTROL_REG;
+		buf[3] = 0x5E;
+		buf[4] = (HWI2C400) ? 0x03 : 0x0D;
+
+		/* I2C Slave device Address */
+		buf[5] = I2C_SLAVE_ADDR_REG;
+		buf[6] = (msg->addr);
+		buf[7] = 0x00;
+		buf[8] = USB_END_I2C_CMD;
+		ret = mxl111sf_i2c_send_data(state, 0, buf);
+
+		/* check for slave device status */
+		if (mxl111sf_i2c_check_status(state) == 1) {
+			mxl_i2c("NACK writing slave address %02x",
+				msg->addr);
+			/* if NACK, stop I2C bus and exit */
+			buf[2] = I2C_CONTROL_REG;
+			buf[3] = 0x4E;
+			buf[4] = (HWI2C400) ? 0x03 : 0x0D;
+			ret = -EIO;
+			goto exit;
+		}
+
+		/* I2C interface can do I2C operations in block of 8 bytes of
+		   I2C data. calculation to figure out number of blocks of i2c
+		   data required to program */
+		block_len = (msg->len / 8);
+		left_over_len = (msg->len % 8);
+		index = 0;
+
+		mxl_i2c("block_len %d, left_over_len %d",
+			block_len, left_over_len);
+
+		for (index = 0; index < block_len; index++) {
+			for (i = 0; i < 8; i++) {
+				/* write data on I2C interface */
+				buf[2+(i*3)] = I2C_DATA_REG;
+				buf[3+(i*3)] = msg->buf[(index*8)+i];
+				buf[4+(i*3)] = 0x00;
+			}
+
+			ret = mxl111sf_i2c_send_data(state, 0, buf);
+
+			/* check for I2C NACK status */
+			if (mxl111sf_i2c_check_status(state) == 1) {
+				mxl_i2c("NACK writing slave address %02x",
+					msg->addr);
+
+				/* if NACK, stop I2C bus and exit */
+				buf[2] = I2C_CONTROL_REG;
+				buf[3] = 0x4E;
+				buf[4] = (HWI2C400) ? 0x03 : 0x0D;
+				ret = -EIO;
+				goto exit;
+			}
+
+		}
+
+		if (left_over_len) {
+			for (k = 0; k < 26; k++)
+				buf[k] = USB_END_I2C_CMD;
+
+			buf[0] = 0x99;
+			buf[1] = 0x00;
+
+			for (i = 0; i < left_over_len; i++) {
+				buf[2+(i*3)] = I2C_DATA_REG;
+				buf[3+(i*3)] = msg->buf[(index*8)+i];
+				mxl_i2c("index = %d %d data %d",
+					index, i, msg->buf[(index*8)+i]);
+				buf[4+(i*3)] = 0x00;
+			}
+			ret = mxl111sf_i2c_send_data(state, 0, buf);
+
+			/* check for I2C NACK status */
+			if (mxl111sf_i2c_check_status(state) == 1) {
+				mxl_i2c("NACK writing slave address %02x",
+					msg->addr);
+
+				/* if NACK, stop I2C bus and exit */
+				buf[2] = I2C_CONTROL_REG;
+				buf[3] = 0x4E;
+				buf[4] = (HWI2C400) ? 0x03 : 0x0D;
+				ret = -EIO;
+				goto exit;
+			}
+
+		}
+
+		/* issue I2C STOP after write */
+		buf[2] = I2C_CONTROL_REG;
+		buf[3] = 0x4E;
+		buf[4] = (HWI2C400) ? 0x03 : 0x0D;
+
+	}
+
+	/* read data from I2C bus */
+	if ((msg->flags & I2C_M_RD) && (msg->len > 0)) {
+		mxl_i2c("read buf len %d", msg->len);
+
+		/* command to indicate data payload is
+		   destined for I2C interface */
+		buf[2] = I2C_CONTROL_REG;
+		buf[3] = 0xDF;
+		buf[4] = (HWI2C400) ? 0x03 : 0x0D;
+
+		/* I2C xfer length */
+		buf[5] = 0x14;
+		buf[6] = (msg->len & 0xFF);
+		buf[7] = 0;
+
+		/* I2C slave device Address */
+		buf[8] = I2C_SLAVE_ADDR_REG;
+		buf[9] = msg->addr;
+		buf[10] = 0x00;
+		buf[11] = USB_END_I2C_CMD;
+		ret = mxl111sf_i2c_send_data(state, 0, buf);
+
+		/* check for I2C NACK status */
+		if (mxl111sf_i2c_check_status(state) == 1) {
+			mxl_i2c("NACK reading slave address %02x",
+				msg->addr);
+
+			/* if NACK, stop I2C bus and exit */
+			buf[2] = I2C_CONTROL_REG;
+			buf[3] = 0xC7;
+			buf[4] = (HWI2C400) ? 0x03 : 0x0D;
+			ret = -EIO;
+			goto exit;
+		}
+
+		/* I2C interface can do I2C operations in block of 8 bytes of
+		   I2C data. calculation to figure out number of blocks of
+		   i2c data required to program */
+		block_len = ((msg->len) / 8);
+		left_over_len = ((msg->len) % 8);
+		index = 0;
+
+		mxl_i2c("block_len %d, left_over_len %d",
+			block_len, left_over_len);
+
+		/* command to read data from I2C interface */
+		buf[0] = USB_READ_I2C_CMD;
+		buf[1] = 0x00;
+
+		for (index = 0; index < block_len; index++) {
+			/* setup I2C read request packet on I2C interface */
+			for (i = 0; i < 8; i++) {
+				buf[2+(i*3)] = I2C_DATA_REG;
+				buf[3+(i*3)] = 0x00;
+				buf[4+(i*3)] = 0x00;
+			}
+
+			ret = mxl111sf_i2c_get_data(state, 0, buf, i2c_r_data);
+
+			/* check for I2C NACK status */
+			if (mxl111sf_i2c_check_status(state) == 1) {
+				mxl_i2c("NACK reading slave address %02x",
+					msg->addr);
+
+				/* if NACK, stop I2C bus and exit */
+				buf[2] = I2C_CONTROL_REG;
+				buf[3] = 0xC7;
+				buf[4] = (HWI2C400) ? 0x03 : 0x0D;
+				ret = -EIO;
+				goto exit;
+			}
+
+			/* copy data from i2c data payload to read buffer */
+			for (i = 0; i < 8; i++) {
+				rd_status[i] = i2c_r_data[(i*3)+2];
+
+				if (rd_status[i] == 0x04) {
+					if (i < 7) {
+						mxl_i2c("i2c fifo empty!"
+							" @ %d", i);
+						msg->buf[(index*8)+i] =
+							i2c_r_data[(i*3)+1];
+						/* read again */
+						ret_status =
+							mxl111sf_i2c_readagain(
+								state, 8-(i+1),
+								readbuff);
+						if (ret_status == 1) {
+							for (k = 0;
+							     k < 8-(i+1);
+							     k++) {
+
+					msg->buf[(index*8)+(k+i+1)] =
+						readbuff[k];
+					mxl_i2c("read data: %02x\t %02x",
+						msg->buf[(index*8)+(k+i)],
+						(index*8)+(k+i));
+					mxl_i2c("read data: %02x\t %02x",
+						msg->buf[(index*8)+(k+i+1)],
+						readbuff[k]);
+
+							}
+							goto stop_copy;
+						} else {
+							mxl_i2c("readagain "
+								"ERROR!");
+						}
+					} else {
+						msg->buf[(index*8)+i] =
+							i2c_r_data[(i*3)+1];
+					}
+				} else {
+					msg->buf[(index*8)+i] =
+						i2c_r_data[(i*3)+1];
+				}
+			}
+stop_copy:
+			;
+
+		}
+
+		if (left_over_len) {
+			for (k = 0; k < 26; k++)
+				buf[k] = USB_END_I2C_CMD;
+
+			buf[0] = 0xDD;
+			buf[1] = 0x00;
+
+			for (i = 0; i < left_over_len; i++) {
+				buf[2+(i*3)] = I2C_DATA_REG;
+				buf[3+(i*3)] = 0x00;
+				buf[4+(i*3)] = 0x00;
+			}
+			ret = mxl111sf_i2c_get_data(state, 0, buf,
+						    i2c_r_data);
+
+			/* check for I2C NACK status */
+			if (mxl111sf_i2c_check_status(state) == 1) {
+				mxl_i2c("NACK reading slave address %02x",
+					msg->addr);
+
+				/* if NACK, stop I2C bus and exit */
+				buf[2] = I2C_CONTROL_REG;
+				buf[3] = 0xC7;
+				buf[4] = (HWI2C400) ? 0x03 : 0x0D;
+				ret = -EIO;
+				goto exit;
+			}
+
+			for (i = 0; i < left_over_len; i++) {
+				msg->buf[(block_len*8)+i] =
+					i2c_r_data[(i*3)+1];
+				mxl_i2c("read data: %02x\t %02x",
+					i2c_r_data[(i*3)+1],
+					i2c_r_data[(i*3)+2]);
+			}
+		}
+
+		/* indicate I2C interface to issue NACK
+		   after next I2C read op */
+		buf[0] = USB_WRITE_I2C_CMD;
+		buf[1] = 0x00;
+
+		/* control register */
+		buf[2] = I2C_CONTROL_REG;
+		buf[3] = 0x17;
+		buf[4] = (HWI2C400) ? 0x03 : 0x0D;
+
+		buf[5] = USB_END_I2C_CMD;
+		ret = mxl111sf_i2c_send_data(state, 0, buf);
+
+		/* control register */
+		buf[2] = I2C_CONTROL_REG;
+		buf[3] = 0xC7;
+		buf[4] = (HWI2C400) ? 0x03 : 0x0D;
+
+	}
+exit:
+	/* STOP and disable I2C MUX */
+	buf[0] = USB_WRITE_I2C_CMD;
+	buf[1] = 0x00;
+
+	/* de-initilize I2C BUS */
+	buf[5] = USB_END_I2C_CMD;
+	mxl111sf_i2c_send_data(state, 0, buf);
+
+	/* Control Register */
+	buf[2] = I2C_CONTROL_REG;
+	buf[3] = 0xDF;
+	buf[4] = 0x03;
+
+	/* disable I2C interface */
+	buf[5] = I2C_MUX_REG;
+	buf[6] = 0x00;
+	buf[7] = 0x00;
+
+	/* de-initilize I2C BUS */
+	buf[8] = USB_END_I2C_CMD;
+	mxl111sf_i2c_send_data(state, 0, buf);
+
+	/* disable I2C interface */
+	buf[2] = I2C_MUX_REG;
+	buf[3] = 0x81;
+	buf[4] = 0x00;
+
+	/* disable I2C interface */
+	buf[5] = I2C_MUX_REG;
+	buf[6] = 0x00;
+	buf[7] = 0x00;
+
+	/* disable I2C interface */
+	buf[8] = I2C_MUX_REG;
+	buf[9] = 0x00;
+	buf[10] = 0x00;
+
+	buf[11] = USB_END_I2C_CMD;
+	mxl111sf_i2c_send_data(state, 0, buf);
+
+	return ret;
+}
+
+/* ------------------------------------------------------------------------ */
+
+int mxl111sf_i2c_xfer(struct i2c_adapter *adap,
+		      struct i2c_msg msg[], int num)
+{
+	struct dvb_usb_device *d = i2c_get_adapdata(adap);
+	struct mxl111sf_state *state = d->priv;
+	int hwi2c = (state->chip_rev > MXL111SF_V6);
+	int i, ret;
+
+	if (mutex_lock_interruptible(&d->i2c_mutex) < 0)
+		return -EAGAIN;
+
+	for (i = 0; i < num; i++) {
+		ret = (hwi2c) ?
+			mxl111sf_i2c_hw_xfer_msg(state, &msg[i]) :
+			mxl111sf_i2c_sw_xfer_msg(state, &msg[i]);
+		if (mxl_fail(ret)) {
+			mxl_debug_adv("failed with error %d on i2c "
+				      "transaction %d of %d, %sing %d bytes "
+				      "to/from 0x%02x", ret, i+1, num,
+				      (msg[i].flags & I2C_M_RD) ?
+				      "read" : "writ",
+				      msg[i].len, msg[i].addr);
+
+			break;
+		}
+	}
+
+	mutex_unlock(&d->i2c_mutex);
+
+	return i == num ? num : -EREMOTEIO;
+}
+
+/*
+ * Local variables:
+ * c-basic-offset: 8
+ * End:
+ */