Merge branch 'tracing/core' into tracing/hw-breakpoints

Conflicts:
	arch/Kconfig
	kernel/trace/trace.h

Merge reason: resolve the conflicts, plus adopt to the new
              ring-buffer APIs.

Signed-off-by: Ingo Molnar <mingo@elte.hu>

16 files changed, 1021 insertions, 472 deletions

diff --git a/drivers/i2c/busses/Kconfig b/drivers/i2c/busses/Kconfig
index 3c259ee7ddda..8206442fbabd 100644
--- a/drivers/i2c/busses/Kconfig
+++ b/drivers/i2c/busses/Kconfig
@@ -326,6 +326,16 @@ config I2C_DAVINCI
 	  devices such as DaVinci NIC.
 	  For details please see http://www.ti.com/davinci
 
+config I2C_DESIGNWARE
+	tristate "Synopsys DesignWare"
+	depends on HAVE_CLK
+	help
+	  If you say yes to this option, support will be included for the
+	  Synopsys DesignWare I2C adapter. Only master mode is supported.
+
+	  This driver can also be built as a module.  If so, the module
+	  will be called i2c-designware.
+
 config I2C_GPIO
 	tristate "GPIO-based bitbanging I2C"
 	depends on GENERIC_GPIO
diff --git a/drivers/i2c/busses/Makefile b/drivers/i2c/busses/Makefile
index edeabf003106..e654263bfc01 100644
--- a/drivers/i2c/busses/Makefile
+++ b/drivers/i2c/busses/Makefile
@@ -30,6 +30,7 @@ obj-$(CONFIG_I2C_AU1550)	+= i2c-au1550.o
 obj-$(CONFIG_I2C_BLACKFIN_TWI)	+= i2c-bfin-twi.o
 obj-$(CONFIG_I2C_CPM)		+= i2c-cpm.o
 obj-$(CONFIG_I2C_DAVINCI)	+= i2c-davinci.o
+obj-$(CONFIG_I2C_DESIGNWARE)	+= i2c-designware.o
 obj-$(CONFIG_I2C_GPIO)		+= i2c-gpio.o
 obj-$(CONFIG_I2C_HIGHLANDER)	+= i2c-highlander.o
 obj-$(CONFIG_I2C_IBM_IIC)	+= i2c-ibm_iic.o
diff --git a/drivers/i2c/busses/i2c-cpm.c b/drivers/i2c/busses/i2c-cpm.c
index b5db8b883615..9c2e10082b79 100644
--- a/drivers/i2c/busses/i2c-cpm.c
+++ b/drivers/i2c/busses/i2c-cpm.c
@@ -140,7 +140,7 @@ static irqreturn_t cpm_i2c_interrupt(int irq, void *dev_id)
 
 	dev_dbg(&adap->dev, "Interrupt: %x\n", i);
 
-	wake_up_interruptible(&cpm->i2c_wait);
+	wake_up(&cpm->i2c_wait);
 
 	return i ? IRQ_HANDLED : IRQ_NONE;
 }
@@ -364,12 +364,12 @@ static int cpm_i2c_xfer(struct i2c_adapter *adap, struct i2c_msg *msgs, int num)
 		dev_dbg(&adap->dev, "test ready.\n");
 		pmsg = &msgs[tptr];
 		if (pmsg->flags & I2C_M_RD)
-			ret = wait_event_interruptible_timeout(cpm->i2c_wait,
+			ret = wait_event_timeout(cpm->i2c_wait,
 				(in_be16(&tbdf[tptr].cbd_sc) & BD_SC_NAK) ||
 				!(in_be16(&rbdf[rptr].cbd_sc) & BD_SC_EMPTY),
 				1 * HZ);
 		else
-			ret = wait_event_interruptible_timeout(cpm->i2c_wait,
+			ret = wait_event_timeout(cpm->i2c_wait,
 				!(in_be16(&tbdf[tptr].cbd_sc) & BD_SC_READY),
 				1 * HZ);
 		if (ret == 0) {
diff --git a/drivers/i2c/busses/i2c-davinci.c b/drivers/i2c/busses/i2c-davinci.c
index 3fae3a91ce5b..c89687a10835 100644
--- a/drivers/i2c/busses/i2c-davinci.c
+++ b/drivers/i2c/busses/i2c-davinci.c
@@ -187,6 +187,11 @@ static int i2c_davinci_init(struct davinci_i2c_dev *dev)
 	davinci_i2c_write_reg(dev, DAVINCI_I2C_CLKH_REG, clkh);
 	davinci_i2c_write_reg(dev, DAVINCI_I2C_CLKL_REG, clkl);
 
+	/* Respond at reserved "SMBus Host" slave address" (and zero);
+	 * we seem to have no option to not respond...
+	 */
+	davinci_i2c_write_reg(dev, DAVINCI_I2C_OAR_REG, 0x08);
+
 	dev_dbg(dev->dev, "input_clock = %d, CLK = %d\n", input_clock, clk);
 	dev_dbg(dev->dev, "PSC  = %d\n",
 		davinci_i2c_read_reg(dev, DAVINCI_I2C_PSC_REG));
@@ -387,7 +392,7 @@ static void terminate_write(struct davinci_i2c_dev *dev)
 	davinci_i2c_write_reg(dev, DAVINCI_I2C_MDR_REG, w);
 
 	if (!dev->terminate)
-		dev_err(dev->dev, "TDR IRQ while no data to send\n");
+		dev_dbg(dev->dev, "TDR IRQ while no data to send\n");
 }
 
 /*
@@ -473,9 +478,14 @@ static irqreturn_t i2c_davinci_isr(int this_irq, void *dev_id)
 			break;
 
 		case DAVINCI_I2C_IVR_AAS:
-			dev_warn(dev->dev, "Address as slave interrupt\n");
-		}/* switch */
-	}/* while */
+			dev_dbg(dev->dev, "Address as slave interrupt\n");
+			break;
+
+		default:
+			dev_warn(dev->dev, "Unrecognized irq stat %d\n", stat);
+			break;
+		}
+	}
 
 	return count ? IRQ_HANDLED : IRQ_NONE;
 }
@@ -505,7 +515,7 @@ static int davinci_i2c_probe(struct platform_device *pdev)
 		return -ENODEV;
 	}
 
-	ioarea = request_mem_region(mem->start, (mem->end - mem->start) + 1,
+	ioarea = request_mem_region(mem->start, resource_size(mem),
 				    pdev->name);
 	if (!ioarea) {
 		dev_err(&pdev->dev, "I2C region already claimed\n");
@@ -523,7 +533,7 @@ static int davinci_i2c_probe(struct platform_device *pdev)
 	dev->irq = irq->start;
 	platform_set_drvdata(pdev, dev);
 
-	dev->clk = clk_get(&pdev->dev, "I2CCLK");
+	dev->clk = clk_get(&pdev->dev, NULL);
 	if (IS_ERR(dev->clk)) {
 		r = -ENODEV;
 		goto err_free_mem;
@@ -568,7 +578,7 @@ err_free_mem:
 	put_device(&pdev->dev);
 	kfree(dev);
 err_release_region:
-	release_mem_region(mem->start, (mem->end - mem->start) + 1);
+	release_mem_region(mem->start, resource_size(mem));
 
 	return r;
 }
@@ -591,7 +601,7 @@ static int davinci_i2c_remove(struct platform_device *pdev)
 	kfree(dev);
 
 	mem = platform_get_resource(pdev, IORESOURCE_MEM, 0);
-	release_mem_region(mem->start, (mem->end - mem->start) + 1);
+	release_mem_region(mem->start, resource_size(mem));
 	return 0;
 }
 
diff --git a/drivers/i2c/busses/i2c-designware.c b/drivers/i2c/busses/i2c-designware.c
new file mode 100644
index 000000000000..b444762e9b9f
--- /dev/null
+++ b/drivers/i2c/busses/i2c-designware.c
@@ -0,0 +1,624 @@
+/*
+ * Synopsys Designware I2C adapter driver (master only).
+ *
+ * Based on the TI DAVINCI I2C adapter driver.
+ *
+ * Copyright (C) 2006 Texas Instruments.
+ * Copyright (C) 2007 MontaVista Software Inc.
+ * Copyright (C) 2009 Provigent Ltd.
+ *
+ * ----------------------------------------------------------------------------
+ *
+ * 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 <linux/kernel.h>
+#include <linux/module.h>
+#include <linux/delay.h>
+#include <linux/i2c.h>
+#include <linux/clk.h>
+#include <linux/errno.h>
+#include <linux/sched.h>
+#include <linux/err.h>
+#include <linux/interrupt.h>
+#include <linux/platform_device.h>
+#include <linux/io.h>
+
+/*
+ * Registers offset
+ */
+#define DW_IC_CON		0x0
+#define DW_IC_TAR		0x4
+#define DW_IC_DATA_CMD		0x10
+#define DW_IC_SS_SCL_HCNT	0x14
+#define DW_IC_SS_SCL_LCNT	0x18
+#define DW_IC_FS_SCL_HCNT	0x1c
+#define DW_IC_FS_SCL_LCNT	0x20
+#define DW_IC_INTR_STAT		0x2c
+#define DW_IC_INTR_MASK		0x30
+#define DW_IC_CLR_INTR		0x40
+#define DW_IC_ENABLE		0x6c
+#define DW_IC_STATUS		0x70
+#define DW_IC_TXFLR		0x74
+#define DW_IC_RXFLR		0x78
+#define DW_IC_COMP_PARAM_1	0xf4
+#define DW_IC_TX_ABRT_SOURCE	0x80
+
+#define DW_IC_CON_MASTER		0x1
+#define DW_IC_CON_SPEED_STD		0x2
+#define DW_IC_CON_SPEED_FAST		0x4
+#define DW_IC_CON_10BITADDR_MASTER	0x10
+#define DW_IC_CON_RESTART_EN		0x20
+#define DW_IC_CON_SLAVE_DISABLE		0x40
+
+#define DW_IC_INTR_TX_EMPTY	0x10
+#define DW_IC_INTR_TX_ABRT	0x40
+#define DW_IC_INTR_STOP_DET	0x200
+
+#define DW_IC_STATUS_ACTIVITY	0x1
+
+#define DW_IC_ERR_TX_ABRT	0x1
+
+/*
+ * status codes
+ */
+#define STATUS_IDLE			0x0
+#define STATUS_WRITE_IN_PROGRESS	0x1
+#define STATUS_READ_IN_PROGRESS		0x2
+
+#define TIMEOUT			20 /* ms */
+
+/*
+ * hardware abort codes from the DW_IC_TX_ABRT_SOURCE register
+ *
+ * only expected abort codes are listed here
+ * refer to the datasheet for the full list
+ */
+#define ABRT_7B_ADDR_NOACK	0
+#define ABRT_10ADDR1_NOACK	1
+#define ABRT_10ADDR2_NOACK	2
+#define ABRT_TXDATA_NOACK	3
+#define ABRT_GCALL_NOACK	4
+#define ABRT_GCALL_READ		5
+#define ABRT_SBYTE_ACKDET	7
+#define ABRT_SBYTE_NORSTRT	9
+#define ABRT_10B_RD_NORSTRT	10
+#define ARB_MASTER_DIS		11
+#define ARB_LOST		12
+
+static char *abort_sources[] = {
+	[ABRT_7B_ADDR_NOACK]	=
+		"slave address not acknowledged (7bit mode)",
+	[ABRT_10ADDR1_NOACK]	=
+		"first address byte not acknowledged (10bit mode)",
+	[ABRT_10ADDR2_NOACK]	=
+		"second address byte not acknowledged (10bit mode)",
+	[ABRT_TXDATA_NOACK]		=
+		"data not acknowledged",
+	[ABRT_GCALL_NOACK]		=
+		"no acknowledgement for a general call",
+	[ABRT_GCALL_READ]		=
+		"read after general call",
+	[ABRT_SBYTE_ACKDET]		=
+		"start byte acknowledged",
+	[ABRT_SBYTE_NORSTRT]	=
+		"trying to send start byte when restart is disabled",
+	[ABRT_10B_RD_NORSTRT]	=
+		"trying to read when restart is disabled (10bit mode)",
+	[ARB_MASTER_DIS]		=
+		"trying to use disabled adapter",
+	[ARB_LOST]			=
+		"lost arbitration",
+};
+
+/**
+ * struct dw_i2c_dev - private i2c-designware data
+ * @dev: driver model device node
+ * @base: IO registers pointer
+ * @cmd_complete: tx completion indicator
+ * @pump_msg: continue in progress transfers
+ * @lock: protect this struct and IO registers
+ * @clk: input reference clock
+ * @cmd_err: run time hadware error code
+ * @msgs: points to an array of messages currently being transfered
+ * @msgs_num: the number of elements in msgs
+ * @msg_write_idx: the element index of the current tx message in the msgs
+ *	array
+ * @tx_buf_len: the length of the current tx buffer
+ * @tx_buf: the current tx buffer
+ * @msg_read_idx: the element index of the current rx message in the msgs
+ *	array
+ * @rx_buf_len: the length of the current rx buffer
+ * @rx_buf: the current rx buffer
+ * @msg_err: error status of the current transfer
+ * @status: i2c master status, one of STATUS_*
+ * @abort_source: copy of the TX_ABRT_SOURCE register
+ * @irq: interrupt number for the i2c master
+ * @adapter: i2c subsystem adapter node
+ * @tx_fifo_depth: depth of the hardware tx fifo
+ * @rx_fifo_depth: depth of the hardware rx fifo
+ */
+struct dw_i2c_dev {
+	struct device		*dev;
+	void __iomem		*base;
+	struct completion	cmd_complete;
+	struct tasklet_struct	pump_msg;
+	struct mutex		lock;
+	struct clk		*clk;
+	int			cmd_err;
+	struct i2c_msg		*msgs;
+	int			msgs_num;
+	int			msg_write_idx;
+	u16			tx_buf_len;
+	u8			*tx_buf;
+	int			msg_read_idx;
+	u16			rx_buf_len;
+	u8			*rx_buf;
+	int			msg_err;
+	unsigned int		status;
+	u16			abort_source;
+	int			irq;
+	struct i2c_adapter	adapter;
+	unsigned int		tx_fifo_depth;
+	unsigned int		rx_fifo_depth;
+};
+
+/**
+ * i2c_dw_init() - initialize the designware i2c master hardware
+ * @dev: device private data
+ *
+ * This functions configures and enables the I2C master.
+ * This function is called during I2C init function, and in case of timeout at
+ * run time.
+ */
+static void i2c_dw_init(struct dw_i2c_dev *dev)
+{
+	u32 input_clock_khz = clk_get_rate(dev->clk) / 1000;
+	u16 ic_con;
+
+	/* Disable the adapter */
+	writeb(0, dev->base + DW_IC_ENABLE);
+
+	/* set standard and fast speed deviders for high/low periods */
+	writew((input_clock_khz * 40 / 10000)+1, /* std speed high, 4us */
+			dev->base + DW_IC_SS_SCL_HCNT);
+	writew((input_clock_khz * 47 / 10000)+1, /* std speed low, 4.7us */
+			dev->base + DW_IC_SS_SCL_LCNT);
+	writew((input_clock_khz *  6 / 10000)+1, /* fast speed high, 0.6us */
+			dev->base + DW_IC_FS_SCL_HCNT);
+	writew((input_clock_khz * 13 / 10000)+1, /* fast speed low, 1.3us */
+			dev->base + DW_IC_FS_SCL_LCNT);
+
+	/* configure the i2c master */
+	ic_con = DW_IC_CON_MASTER | DW_IC_CON_SLAVE_DISABLE |
+		DW_IC_CON_RESTART_EN | DW_IC_CON_SPEED_FAST;
+	writew(ic_con, dev->base + DW_IC_CON);
+}
+
+/*
+ * Waiting for bus not busy
+ */
+static int i2c_dw_wait_bus_not_busy(struct dw_i2c_dev *dev)
+{
+	int timeout = TIMEOUT;
+
+	while (readb(dev->base + DW_IC_STATUS) & DW_IC_STATUS_ACTIVITY) {
+		if (timeout <= 0) {
+			dev_warn(dev->dev, "timeout waiting for bus ready\n");
+			return -ETIMEDOUT;
+		}
+		timeout--;
+		mdelay(1);
+	}
+
+	return 0;
+}
+
+/*
+ * Initiate low level master read/write transaction.
+ * This function is called from i2c_dw_xfer when starting a transfer.
+ * This function is also called from dw_i2c_pump_msg to continue a transfer
+ * that is longer than the size of the TX FIFO.
+ */
+static void
+i2c_dw_xfer_msg(struct i2c_adapter *adap)
+{
+	struct dw_i2c_dev *dev = i2c_get_adapdata(adap);
+	struct i2c_msg *msgs = dev->msgs;
+	int num = dev->msgs_num;
+	u16 ic_con, intr_mask;
+	int tx_limit = dev->tx_fifo_depth - readb(dev->base + DW_IC_TXFLR);
+	int rx_limit = dev->rx_fifo_depth - readb(dev->base + DW_IC_RXFLR);
+	u16 addr = msgs[dev->msg_write_idx].addr;
+	u16 buf_len = dev->tx_buf_len;
+
+	if (!(dev->status & STATUS_WRITE_IN_PROGRESS)) {
+		/* Disable the adapter */
+		writeb(0, dev->base + DW_IC_ENABLE);
+
+		/* set the slave (target) address */
+		writew(msgs[dev->msg_write_idx].addr, dev->base + DW_IC_TAR);
+
+		/* if the slave address is ten bit address, enable 10BITADDR */
+		ic_con = readw(dev->base + DW_IC_CON);
+		if (msgs[dev->msg_write_idx].flags & I2C_M_TEN)
+			ic_con |= DW_IC_CON_10BITADDR_MASTER;
+		else
+			ic_con &= ~DW_IC_CON_10BITADDR_MASTER;
+		writew(ic_con, dev->base + DW_IC_CON);
+
+		/* Enable the adapter */
+		writeb(1, dev->base + DW_IC_ENABLE);
+	}
+
+	for (; dev->msg_write_idx < num; dev->msg_write_idx++) {
+		/* if target address has changed, we need to
+		 * reprogram the target address in the i2c
+		 * adapter when we are done with this transfer
+		 */
+		if (msgs[dev->msg_write_idx].addr != addr)
+			return;
+
+		if (msgs[dev->msg_write_idx].len == 0) {
+			dev_err(dev->dev,
+				"%s: invalid message length\n", __func__);
+			dev->msg_err = -EINVAL;
+			return;
+		}
+
+		if (!(dev->status & STATUS_WRITE_IN_PROGRESS)) {
+			/* new i2c_msg */
+			dev->tx_buf = msgs[dev->msg_write_idx].buf;
+			buf_len = msgs[dev->msg_write_idx].len;
+		}
+
+		while (buf_len > 0 && tx_limit > 0 && rx_limit > 0) {
+			if (msgs[dev->msg_write_idx].flags & I2C_M_RD) {
+				writew(0x100, dev->base + DW_IC_DATA_CMD);
+				rx_limit--;
+			} else
+				writew(*(dev->tx_buf++),
+						dev->base + DW_IC_DATA_CMD);
+			tx_limit--; buf_len--;
+		}
+	}
+
+	intr_mask = DW_IC_INTR_STOP_DET | DW_IC_INTR_TX_ABRT;
+	if (buf_len > 0) { /* more bytes to be written */
+		intr_mask |= DW_IC_INTR_TX_EMPTY;
+		dev->status |= STATUS_WRITE_IN_PROGRESS;
+	} else
+		dev->status &= ~STATUS_WRITE_IN_PROGRESS;
+	writew(intr_mask, dev->base + DW_IC_INTR_MASK);
+
+	dev->tx_buf_len = buf_len;
+}
+
+static void
+i2c_dw_read(struct i2c_adapter *adap)
+{
+	struct dw_i2c_dev *dev = i2c_get_adapdata(adap);
+	struct i2c_msg *msgs = dev->msgs;
+	int num = dev->msgs_num;
+	u16 addr = msgs[dev->msg_read_idx].addr;
+	int rx_valid = readw(dev->base + DW_IC_RXFLR);
+
+	for (; dev->msg_read_idx < num; dev->msg_read_idx++) {
+		u16 len;
+		u8 *buf;
+
+		if (!(msgs[dev->msg_read_idx].flags & I2C_M_RD))
+			continue;
+
+		/* different i2c client, reprogram the i2c adapter */
+		if (msgs[dev->msg_read_idx].addr != addr)
+			return;
+
+		if (!(dev->status & STATUS_READ_IN_PROGRESS)) {
+			len = msgs[dev->msg_read_idx].len;
+			buf = msgs[dev->msg_read_idx].buf;
+		} else {
+			len = dev->rx_buf_len;
+			buf = dev->rx_buf;
+		}
+
+		for (; len > 0 && rx_valid > 0; len--, rx_valid--)
+			*buf++ = readb(dev->base + DW_IC_DATA_CMD);
+
+		if (len > 0) {
+			dev->status |= STATUS_READ_IN_PROGRESS;
+			dev->rx_buf_len = len;
+			dev->rx_buf = buf;
+			return;
+		} else
+			dev->status &= ~STATUS_READ_IN_PROGRESS;
+	}
+}
+
+/*
+ * Prepare controller for a transaction and call i2c_dw_xfer_msg
+ */
+static int
+i2c_dw_xfer(struct i2c_adapter *adap, struct i2c_msg msgs[], int num)
+{
+	struct dw_i2c_dev *dev = i2c_get_adapdata(adap);
+	int ret;
+
+	dev_dbg(dev->dev, "%s: msgs: %d\n", __func__, num);
+
+	mutex_lock(&dev->lock);
+
+	INIT_COMPLETION(dev->cmd_complete);
+	dev->msgs = msgs;
+	dev->msgs_num = num;
+	dev->cmd_err = 0;
+	dev->msg_write_idx = 0;
+	dev->msg_read_idx = 0;
+	dev->msg_err = 0;
+	dev->status = STATUS_IDLE;
+
+	ret = i2c_dw_wait_bus_not_busy(dev);
+	if (ret < 0)
+		goto done;
+
+	/* start the transfers */
+	i2c_dw_xfer_msg(adap);
+
+	/* wait for tx to complete */
+	ret = wait_for_completion_interruptible_timeout(&dev->cmd_complete, HZ);
+	if (ret == 0) {
+		dev_err(dev->dev, "controller timed out\n");
+		i2c_dw_init(dev);
+		ret = -ETIMEDOUT;
+		goto done;
+	} else if (ret < 0)
+		goto done;
+
+	if (dev->msg_err) {
+		ret = dev->msg_err;
+		goto done;
+	}
+
+	/* no error */
+	if (likely(!dev->cmd_err)) {
+		/* read rx fifo, and disable the adapter */
+		do {
+			i2c_dw_read(adap);
+		} while (dev->status & STATUS_READ_IN_PROGRESS);
+		writeb(0, dev->base + DW_IC_ENABLE);
+		ret = num;
+		goto done;
+	}
+
+	/* We have an error */
+	if (dev->cmd_err == DW_IC_ERR_TX_ABRT) {
+		unsigned long abort_source = dev->abort_source;
+		int i;
+
+		for_each_bit(i, &abort_source, ARRAY_SIZE(abort_sources)) {
+		    dev_err(dev->dev, "%s: %s\n", __func__, abort_sources[i]);
+		}
+	}
+	ret = -EIO;
+
+done:
+	mutex_unlock(&dev->lock);
+
+	return ret;
+}
+
+static u32 i2c_dw_func(struct i2c_adapter *adap)
+{
+	return I2C_FUNC_I2C | I2C_FUNC_10BIT_ADDR;
+}
+
+static void dw_i2c_pump_msg(unsigned long data)
+{
+	struct dw_i2c_dev *dev = (struct dw_i2c_dev *) data;
+	u16 intr_mask;
+
+	i2c_dw_read(&dev->adapter);
+	i2c_dw_xfer_msg(&dev->adapter);
+
+	intr_mask = DW_IC_INTR_STOP_DET | DW_IC_INTR_TX_ABRT;
+	if (dev->status & STATUS_WRITE_IN_PROGRESS)
+		intr_mask |= DW_IC_INTR_TX_EMPTY;
+	writew(intr_mask, dev->base + DW_IC_INTR_MASK);
+}
+
+/*
+ * Interrupt service routine. This gets called whenever an I2C interrupt
+ * occurs.
+ */
+static irqreturn_t i2c_dw_isr(int this_irq, void *dev_id)
+{
+	struct dw_i2c_dev *dev = dev_id;
+	u16 stat;
+
+	stat = readw(dev->base + DW_IC_INTR_STAT);
+	dev_dbg(dev->dev, "%s: stat=0x%x\n", __func__, stat);
+	if (stat & DW_IC_INTR_TX_ABRT) {
+		dev->abort_source = readw(dev->base + DW_IC_TX_ABRT_SOURCE);
+		dev->cmd_err |= DW_IC_ERR_TX_ABRT;
+		dev->status = STATUS_IDLE;
+	} else if (stat & DW_IC_INTR_TX_EMPTY)
+		tasklet_schedule(&dev->pump_msg);
+
+	readb(dev->base + DW_IC_CLR_INTR);	/* clear interrupts */
+	writew(0, dev->base + DW_IC_INTR_MASK);	/* disable interrupts */
+	if (stat & (DW_IC_INTR_TX_ABRT | DW_IC_INTR_STOP_DET))
+		complete(&dev->cmd_complete);
+
+	return IRQ_HANDLED;
+}
+
+static struct i2c_algorithm i2c_dw_algo = {
+	.master_xfer	= i2c_dw_xfer,
+	.functionality	= i2c_dw_func,
+};
+
+static int __devinit dw_i2c_probe(struct platform_device *pdev)
+{
+	struct dw_i2c_dev *dev;
+	struct i2c_adapter *adap;
+	struct resource *mem, *irq, *ioarea;
+	int r;
+
+	/* NOTE: driver uses the static register mapping */
+	mem = platform_get_resource(pdev, IORESOURCE_MEM, 0);
+	if (!mem) {
+		dev_err(&pdev->dev, "no mem resource?\n");
+		return -EINVAL;
+	}
+
+	irq = platform_get_resource(pdev, IORESOURCE_IRQ, 0);
+	if (!irq) {
+		dev_err(&pdev->dev, "no irq resource?\n");
+		return -EINVAL;
+	}
+
+	ioarea = request_mem_region(mem->start, resource_size(mem),
+			pdev->name);
+	if (!ioarea) {
+		dev_err(&pdev->dev, "I2C region already claimed\n");
+		return -EBUSY;
+	}
+
+	dev = kzalloc(sizeof(struct dw_i2c_dev), GFP_KERNEL);
+	if (!dev) {
+		r = -ENOMEM;
+		goto err_release_region;
+	}
+
+	init_completion(&dev->cmd_complete);
+	tasklet_init(&dev->pump_msg, dw_i2c_pump_msg, (unsigned long) dev);
+	mutex_init(&dev->lock);
+	dev->dev = get_device(&pdev->dev);
+	dev->irq = irq->start;
+	platform_set_drvdata(pdev, dev);
+
+	dev->clk = clk_get(&pdev->dev, NULL);
+	if (IS_ERR(dev->clk)) {
+		r = -ENODEV;
+		goto err_free_mem;
+	}
+	clk_enable(dev->clk);
+
+	dev->base = ioremap(mem->start, resource_size(mem));
+	if (dev->base == NULL) {
+		dev_err(&pdev->dev, "failure mapping io resources\n");
+		r = -EBUSY;
+		goto err_unuse_clocks;
+	}
+	{
+		u32 param1 = readl(dev->base + DW_IC_COMP_PARAM_1);
+
+		dev->tx_fifo_depth = ((param1 >> 16) & 0xff) + 1;
+		dev->rx_fifo_depth = ((param1 >> 8)  & 0xff) + 1;
+	}
+	i2c_dw_init(dev);
+
+	writew(0, dev->base + DW_IC_INTR_MASK); /* disable IRQ */
+	r = request_irq(dev->irq, i2c_dw_isr, 0, pdev->name, dev);
+	if (r) {
+		dev_err(&pdev->dev, "failure requesting irq %i\n", dev->irq);
+		goto err_iounmap;
+	}
+
+	adap = &dev->adapter;
+	i2c_set_adapdata(adap, dev);
+	adap->owner = THIS_MODULE;
+	adap->class = I2C_CLASS_HWMON;
+	strlcpy(adap->name, "Synopsys DesignWare I2C adapter",
+			sizeof(adap->name));
+	adap->algo = &i2c_dw_algo;
+	adap->dev.parent = &pdev->dev;
+
+	adap->nr = pdev->id;
+	r = i2c_add_numbered_adapter(adap);
+	if (r) {
+		dev_err(&pdev->dev, "failure adding adapter\n");
+		goto err_free_irq;
+	}
+
+	return 0;
+
+err_free_irq:
+	free_irq(dev->irq, dev);
+err_iounmap:
+	iounmap(dev->base);
+err_unuse_clocks:
+	clk_disable(dev->clk);
+	clk_put(dev->clk);
+	dev->clk = NULL;
+err_free_mem:
+	platform_set_drvdata(pdev, NULL);
+	put_device(&pdev->dev);
+	kfree(dev);
+err_release_region:
+	release_mem_region(mem->start, resource_size(mem));
+
+	return r;
+}
+
+static int __devexit dw_i2c_remove(struct platform_device *pdev)
+{
+	struct dw_i2c_dev *dev = platform_get_drvdata(pdev);
+	struct resource *mem;
+
+	platform_set_drvdata(pdev, NULL);
+	i2c_del_adapter(&dev->adapter);
+	put_device(&pdev->dev);
+
+	clk_disable(dev->clk);
+	clk_put(dev->clk);
+	dev->clk = NULL;
+
+	writeb(0, dev->base + DW_IC_ENABLE);
+	free_irq(dev->irq, dev);
+	kfree(dev);
+
+	mem = platform_get_resource(pdev, IORESOURCE_MEM, 0);
+	release_mem_region(mem->start, resource_size(mem));
+	return 0;
+}
+
+/* work with hotplug and coldplug */
+MODULE_ALIAS("platform:i2c_designware");
+
+static struct platform_driver dw_i2c_driver = {
+	.remove		= __devexit_p(dw_i2c_remove),
+	.driver		= {
+		.name	= "i2c_designware",
+		.owner	= THIS_MODULE,
+	},
+};
+
+static int __init dw_i2c_init_driver(void)
+{
+	return platform_driver_probe(&dw_i2c_driver, dw_i2c_probe);
+}
+module_init(dw_i2c_init_driver);
+
+static void __exit dw_i2c_exit_driver(void)
+{
+	platform_driver_unregister(&dw_i2c_driver);
+}
+module_exit(dw_i2c_exit_driver);
+
+MODULE_AUTHOR("Baruch Siach <baruch@tkos.co.il>");
+MODULE_DESCRIPTION("Synopsys DesignWare I2C bus adapter");
+MODULE_LICENSE("GPL");
diff --git a/drivers/i2c/busses/i2c-ibm_iic.c b/drivers/i2c/busses/i2c-ibm_iic.c
index e4476743f203..b1bc6e277d2a 100644
--- a/drivers/i2c/busses/i2c-ibm_iic.c
+++ b/drivers/i2c/busses/i2c-ibm_iic.c
@@ -85,10 +85,11 @@ static void dump_iic_regs(const char* header, struct ibm_iic_private* dev)
 {
 	volatile struct iic_regs __iomem *iic = dev->vaddr;
 	printk(KERN_DEBUG "ibm-iic%d: %s\n", dev->idx, header);
-	printk(KERN_DEBUG "  cntl     = 0x%02x, mdcntl = 0x%02x\n"
-	       KERN_DEBUG "  sts      = 0x%02x, extsts = 0x%02x\n"
-	       KERN_DEBUG "  clkdiv   = 0x%02x, xfrcnt = 0x%02x\n"
-	       KERN_DEBUG "  xtcntlss = 0x%02x, directcntl = 0x%02x\n",
+	printk(KERN_DEBUG
+	       "  cntl     = 0x%02x, mdcntl = 0x%02x\n"
+	       "  sts      = 0x%02x, extsts = 0x%02x\n"
+	       "  clkdiv   = 0x%02x, xfrcnt = 0x%02x\n"
+	       "  xtcntlss = 0x%02x, directcntl = 0x%02x\n",
 		in_8(&iic->cntl), in_8(&iic->mdcntl), in_8(&iic->sts),
 		in_8(&iic->extsts), in_8(&iic->clkdiv), in_8(&iic->xfrcnt),
 		in_8(&iic->xtcntlss), in_8(&iic->directcntl));
diff --git a/drivers/i2c/busses/i2c-mpc.c b/drivers/i2c/busses/i2c-mpc.c
index dd778d7ae047..d325e86e3103 100644
--- a/drivers/i2c/busses/i2c-mpc.c
+++ b/drivers/i2c/busses/i2c-mpc.c
@@ -197,7 +197,7 @@ int mpc_i2c_get_fdr_52xx(struct device_node *node, u32 clock, int prescaler)
 		return -EINVAL;
 
 	/* Determine divider value */
-	divider = mpc52xx_find_ipb_freq(node) / clock;
+	divider = mpc5xxx_get_bus_frequency(node) / clock;
 
 	/*
 	 * We want to choose an FDR/DFSR that generates an I2C bus speed that
diff --git a/drivers/i2c/busses/i2c-omap.c b/drivers/i2c/busses/i2c-omap.c
index b606db85525d..827da0858136 100644
--- a/drivers/i2c/busses/i2c-omap.c
+++ b/drivers/i2c/busses/i2c-omap.c
@@ -339,7 +339,7 @@ static int omap_i2c_init(struct omap_i2c_dev *dev)
 		 * to get longer filter period for better noise suppression.
 		 * The filter is iclk (fclk for HS) period.
 		 */
-		if (dev->speed > 400 || cpu_is_omap_2430())
+		if (dev->speed > 400 || cpu_is_omap2430())
 			internal_clk = 19200;
 		else if (dev->speed > 100)
 			internal_clk = 9600;
@@ -672,9 +672,17 @@ omap_i2c_isr(int this_irq, void *dev_id)
 			break;
 		}
 
-		omap_i2c_write_reg(dev, OMAP_I2C_STAT_REG, stat);
-
 		err = 0;
+complete:
+		/*
+		 * Ack the stat in one go, but [R/X]DR and [R/X]RDY should be
+		 * acked after the data operation is complete.
+		 * Ref: TRM SWPU114Q Figure 18-31
+		 */
+		omap_i2c_write_reg(dev, OMAP_I2C_STAT_REG, stat &
+				~(OMAP_I2C_STAT_RRDY | OMAP_I2C_STAT_RDR |
+				OMAP_I2C_STAT_XRDY | OMAP_I2C_STAT_XDR));
+
 		if (stat & OMAP_I2C_STAT_NACK) {
 			err |= OMAP_I2C_STAT_NACK;
 			omap_i2c_write_reg(dev, OMAP_I2C_CON_REG,
@@ -685,16 +693,22 @@ omap_i2c_isr(int this_irq, void *dev_id)
 			err |= OMAP_I2C_STAT_AL;
 		}
 		if (stat & (OMAP_I2C_STAT_ARDY | OMAP_I2C_STAT_NACK |
-					OMAP_I2C_STAT_AL))
+					OMAP_I2C_STAT_AL)) {
+			omap_i2c_ack_stat(dev, stat &
+				(OMAP_I2C_STAT_RRDY | OMAP_I2C_STAT_RDR |
+				OMAP_I2C_STAT_XRDY | OMAP_I2C_STAT_XDR));
 			omap_i2c_complete_cmd(dev, err);
+			return IRQ_HANDLED;
+		}
 		if (stat & (OMAP_I2C_STAT_RRDY | OMAP_I2C_STAT_RDR)) {
 			u8 num_bytes = 1;
 			if (dev->fifo_size) {
 				if (stat & OMAP_I2C_STAT_RRDY)
 					num_bytes = dev->fifo_size;
-				else
-					num_bytes = omap_i2c_read_reg(dev,
-							OMAP_I2C_BUFSTAT_REG);
+				else    /* read RXSTAT on RDR interrupt */
+					num_bytes = (omap_i2c_read_reg(dev,
+							OMAP_I2C_BUFSTAT_REG)
+							>> 8) & 0x3F;
 			}
 			while (num_bytes) {
 				num_bytes--;
@@ -731,9 +745,10 @@ omap_i2c_isr(int this_irq, void *dev_id)
 			if (dev->fifo_size) {
 				if (stat & OMAP_I2C_STAT_XRDY)
 					num_bytes = dev->fifo_size;
-				else
+				else    /* read TXSTAT on XDR interrupt */
 					num_bytes = omap_i2c_read_reg(dev,
-							OMAP_I2C_BUFSTAT_REG);
+							OMAP_I2C_BUFSTAT_REG)
+							& 0x3F;
 			}
 			while (num_bytes) {
 				num_bytes--;
@@ -760,6 +775,27 @@ omap_i2c_isr(int this_irq, void *dev_id)
 							"data to send\n");
 					break;
 				}
+
+				/*
+				 * OMAP3430 Errata 1.153: When an XRDY/XDR
+				 * is hit, wait for XUDF before writing data
+				 * to DATA_REG. Otherwise some data bytes can
+				 * be lost while transferring them from the
+				 * memory to the I2C interface.
+				 */
+
+				if (dev->rev <= OMAP_I2C_REV_ON_3430) {
+						while (!(stat & OMAP_I2C_STAT_XUDF)) {
+							if (stat & (OMAP_I2C_STAT_NACK | OMAP_I2C_STAT_AL)) {
+								omap_i2c_ack_stat(dev, stat & (OMAP_I2C_STAT_XRDY | OMAP_I2C_STAT_XDR));
+								err |= OMAP_I2C_STAT_XUDF;
+								goto complete;
+							}
+							cpu_relax();
+							stat = omap_i2c_read_reg(dev, OMAP_I2C_STAT_REG);
+						}
+				}
+
 				omap_i2c_write_reg(dev, OMAP_I2C_DATA_REG, w);
 			}
 			omap_i2c_ack_stat(dev,
@@ -806,7 +842,7 @@ omap_i2c_probe(struct platform_device *pdev)
 		return -ENODEV;
 	}
 
-	ioarea = request_mem_region(mem->start, (mem->end - mem->start) + 1,
+	ioarea = request_mem_region(mem->start, resource_size(mem),
 			pdev->name);
 	if (!ioarea) {
 		dev_err(&pdev->dev, "I2C region already claimed\n");
@@ -879,7 +915,7 @@ omap_i2c_probe(struct platform_device *pdev)
 	i2c_set_adapdata(adap, dev);
 	adap->owner = THIS_MODULE;
 	adap->class = I2C_CLASS_HWMON;
-	strncpy(adap->name, "OMAP I2C adapter", sizeof(adap->name));
+	strlcpy(adap->name, "OMAP I2C adapter", sizeof(adap->name));
 	adap->algo = &omap_i2c_algo;
 	adap->dev.parent = &pdev->dev;
 
@@ -905,7 +941,7 @@ err_free_mem:
 	platform_set_drvdata(pdev, NULL);
 	kfree(dev);
 err_release_region:
-	release_mem_region(mem->start, (mem->end - mem->start) + 1);
+	release_mem_region(mem->start, resource_size(mem));
 
 	return r;
 }
@@ -925,7 +961,7 @@ omap_i2c_remove(struct platform_device *pdev)
 	iounmap(dev->base);
 	kfree(dev);
 	mem = platform_get_resource(pdev, IORESOURCE_MEM, 0);
-	release_mem_region(mem->start, (mem->end - mem->start) + 1);
+	release_mem_region(mem->start, resource_size(mem));
 	return 0;
 }
 
diff --git a/drivers/i2c/busses/i2c-s3c2410.c b/drivers/i2c/busses/i2c-s3c2410.c
index 8f42a4536cdf..20bb0ceb027b 100644
--- a/drivers/i2c/busses/i2c-s3c2410.c
+++ b/drivers/i2c/busses/i2c-s3c2410.c
@@ -763,11 +763,6 @@ static int s3c24xx_i2c_init(struct s3c24xx_i2c *i2c)
 	dev_info(i2c->dev, "bus frequency set to %d KHz\n", freq);
 	dev_dbg(i2c->dev, "S3C2410_IICCON=0x%02lx\n", iicon);
 
-	/* check for s3c2440 i2c controller  */
-
-	if (s3c24xx_i2c_is2440(i2c))
-		writel(0x0, i2c->regs + S3C2440_IICLC);
-
 	return 0;
 }
 
diff --git a/drivers/i2c/busses/i2c-sh_mobile.c b/drivers/i2c/busses/i2c-sh_mobile.c
index 1c01083b01b5..820487d0d5c7 100644
--- a/drivers/i2c/busses/i2c-sh_mobile.c
+++ b/drivers/i2c/busses/i2c-sh_mobile.c
@@ -563,7 +563,7 @@ static int sh_mobile_i2c_probe(struct platform_device *dev)
 		goto err_irq;
 	}
 
-	size = (res->end - res->start) + 1;
+	size = resource_size(res);
 
 	pd->reg = ioremap(res->start, size);
 	if (pd->reg == NULL) {
@@ -637,7 +637,7 @@ static void __exit sh_mobile_i2c_adap_exit(void)
 	platform_driver_unregister(&sh_mobile_i2c_driver);
 }
 
-module_init(sh_mobile_i2c_adap_init);
+subsys_initcall(sh_mobile_i2c_adap_init);
 module_exit(sh_mobile_i2c_adap_exit);
 
 MODULE_DESCRIPTION("SuperH Mobile I2C Bus Controller driver");
diff --git a/drivers/i2c/busses/i2c-simtec.c b/drivers/i2c/busses/i2c-simtec.c
index 042fda295f3a..6407f47bda82 100644
--- a/drivers/i2c/busses/i2c-simtec.c
+++ b/drivers/i2c/busses/i2c-simtec.c
@@ -92,7 +92,7 @@ static int simtec_i2c_probe(struct platform_device *dev)
 		goto err;
 	}
 
-	size = (res->end-res->start)+1;
+	size = resource_size(res);
 
 	pd->ioarea = request_mem_region(res->start, size, dev->name);
 	if (pd->ioarea == NULL) {
diff --git a/drivers/i2c/busses/i2c-stu300.c b/drivers/i2c/busses/i2c-stu300.c
index 182e711318ba..d2728a28a8db 100644
--- a/drivers/i2c/busses/i2c-stu300.c
+++ b/drivers/i2c/busses/i2c-stu300.c
@@ -117,7 +117,8 @@ enum stu300_error {
 	STU300_ERROR_NONE = 0,
 	STU300_ERROR_ACKNOWLEDGE_FAILURE,
 	STU300_ERROR_BUS_ERROR,
-	STU300_ERROR_ARBITRATION_LOST
+	STU300_ERROR_ARBITRATION_LOST,
+	STU300_ERROR_UNKNOWN
 };
 
 /* timeout waiting for the controller to respond */
@@ -127,7 +128,7 @@ enum stu300_error {
  * The number of address send athemps tried before giving up.
  * If the first one failes it seems like 5 to 8 attempts are required.
  */
-#define NUM_ADDR_RESEND_ATTEMPTS 10
+#define NUM_ADDR_RESEND_ATTEMPTS 12
 
 /* I2C clock speed, in Hz 0-400kHz*/
 static unsigned int scl_frequency = 100000;
@@ -149,6 +150,7 @@ module_param(scl_frequency, uint,  0644);
  * @msg_index: index of current message
  * @msg_len: length of current message
  */
+
 struct stu300_dev {
 	struct platform_device	*pdev;
 	struct i2c_adapter	adapter;
@@ -188,6 +190,27 @@ static inline u32 stu300_r8(void __iomem *address)
 	return readl(address) & 0x000000FFU;
 }
 
+static void stu300_irq_enable(struct stu300_dev *dev)
+{
+	u32 val;
+	val = stu300_r8(dev->virtbase + I2C_CR);
+	val |= I2C_CR_INTERRUPT_ENABLE;
+	/* Twice paranoia (possible HW glitch) */
+	stu300_wr8(val, dev->virtbase + I2C_CR);
+	stu300_wr8(val, dev->virtbase + I2C_CR);
+}
+
+static void stu300_irq_disable(struct stu300_dev *dev)
+{
+	u32 val;
+	val = stu300_r8(dev->virtbase + I2C_CR);
+	val &= ~I2C_CR_INTERRUPT_ENABLE;
+	/* Twice paranoia (possible HW glitch) */
+	stu300_wr8(val, dev->virtbase + I2C_CR);
+	stu300_wr8(val, dev->virtbase + I2C_CR);
+}
+
+
 /*
  * Tells whether a certain event or events occurred in
  * response to a command. The events represent states in
@@ -196,9 +219,10 @@ static inline u32 stu300_r8(void __iomem *address)
  * documentation and can only be treated as abstract state
  * machine states.
  *
- * @ret 0 = event has not occurred, any other value means
- * the event occurred.
+ * @ret 0 = event has not occurred or unknown error, any
+ * other value means the correct event occurred or an error.
  */
+
 static int stu300_event_occurred(struct stu300_dev *dev,
 				   enum stu300_event mr_event) {
 	u32 status1;
@@ -206,11 +230,28 @@ static int stu300_event_occurred(struct stu300_dev *dev,
 
 	/* What event happened? */
 	status1 = stu300_r8(dev->virtbase + I2C_SR1);
+
 	if (!(status1 & I2C_SR1_EVF_IND))
 		/* No event at all */
 		return 0;
+
 	status2 = stu300_r8(dev->virtbase + I2C_SR2);
 
+	/* Block any multiple interrupts */
+	stu300_irq_disable(dev);
+
+	/* Check for errors first */
+	if (status2 & I2C_SR2_AF_IND) {
+		dev->cmd_err = STU300_ERROR_ACKNOWLEDGE_FAILURE;
+		return 1;
+	} else if (status2 & I2C_SR2_BERR_IND) {
+		dev->cmd_err = STU300_ERROR_BUS_ERROR;
+		return 1;
+	} else if (status2 & I2C_SR2_ARLO_IND) {
+		dev->cmd_err = STU300_ERROR_ARBITRATION_LOST;
+		return 1;
+	}
+
 	switch (mr_event) {
 	case STU300_EVENT_1:
 		if (status1 & I2C_SR1_ADSL_IND)
@@ -221,10 +262,6 @@ static int stu300_event_occurred(struct stu300_dev *dev,
 	case STU300_EVENT_7:
 	case STU300_EVENT_8:
 		if (status1 & I2C_SR1_BTF_IND) {
-			if (status2 & I2C_SR2_AF_IND)
-				dev->cmd_err = STU300_ERROR_ACKNOWLEDGE_FAILURE;
-			else if (status2 & I2C_SR2_BERR_IND)
-				dev->cmd_err = STU300_ERROR_BUS_ERROR;
 			return 1;
 		}
 		break;
@@ -240,8 +277,6 @@ static int stu300_event_occurred(struct stu300_dev *dev,
 	case STU300_EVENT_6:
 		if (status2 & I2C_SR2_ENDAD_IND) {
 			/* First check for any errors */
-			if (status2 & I2C_SR2_AF_IND)
-				dev->cmd_err = STU300_ERROR_ACKNOWLEDGE_FAILURE;
 			return 1;
 		}
 		break;
@@ -252,8 +287,15 @@ static int stu300_event_occurred(struct stu300_dev *dev,
 	default:
 		break;
 	}
-	if (status2 & I2C_SR2_ARLO_IND)
-		dev->cmd_err = STU300_ERROR_ARBITRATION_LOST;
+	/* If we get here, we're on thin ice.
+	 * Here we are in a status where we have
+	 * gotten a response that does not match
+	 * what we requested.
+	 */
+	dev->cmd_err = STU300_ERROR_UNKNOWN;
+	dev_err(&dev->pdev->dev,
+		"Unhandled interrupt! %d sr1: 0x%x sr2: 0x%x\n",
+		mr_event, status1, status2);
 	return 0;
 }
 
@@ -262,21 +304,20 @@ static irqreturn_t stu300_irh(int irq, void *data)
 	struct stu300_dev *dev = data;
 	int res;
 
+	/* Just make sure that the block is clocked */
+	clk_enable(dev->clk);
+
 	/* See if this was what we were waiting for */
 	spin_lock(&dev->cmd_issue_lock);
-	if (dev->cmd_event != STU300_EVENT_NONE) {
-		res = stu300_event_occurred(dev, dev->cmd_event);
-		if (res || dev->cmd_err != STU300_ERROR_NONE) {
-			u32 val;
-
-			complete(&dev->cmd_complete);
-			/* Block any multiple interrupts */
-			val = stu300_r8(dev->virtbase + I2C_CR);
-			val &= ~I2C_CR_INTERRUPT_ENABLE;
-			stu300_wr8(val, dev->virtbase + I2C_CR);
-		}
-	}
+
+	res = stu300_event_occurred(dev, dev->cmd_event);
+	if (res || dev->cmd_err != STU300_ERROR_NONE)
+		complete(&dev->cmd_complete);
+
 	spin_unlock(&dev->cmd_issue_lock);
+
+	clk_disable(dev->clk);
+
 	return IRQ_HANDLED;
 }
 
@@ -308,7 +349,6 @@ static int stu300_start_and_await_event(struct stu300_dev *dev,
 	stu300_wr8(cr_value, dev->virtbase + I2C_CR);
 	ret = wait_for_completion_interruptible_timeout(&dev->cmd_complete,
 							STU300_TIMEOUT);
-
 	if (ret < 0) {
 		dev_err(&dev->pdev->dev,
 		       "wait_for_completion_interruptible_timeout() "
@@ -342,7 +382,6 @@ static int stu300_await_event(struct stu300_dev *dev,
 				enum stu300_event mr_event)
 {
 	int ret;
-	u32 val;
 
 	if (unlikely(irqs_disabled())) {
 		/* TODO: implement polling for this case if need be. */
@@ -354,36 +393,18 @@ static int stu300_await_event(struct stu300_dev *dev,
 	/* Is it already here? */
 	spin_lock_irq(&dev->cmd_issue_lock);
 	dev->cmd_err = STU300_ERROR_NONE;
-	if (stu300_event_occurred(dev, mr_event)) {
-		spin_unlock_irq(&dev->cmd_issue_lock);
-		goto exit_await_check_err;
-	}
-	init_completion(&dev->cmd_complete);
-	dev->cmd_err = STU300_ERROR_NONE;
 	dev->cmd_event = mr_event;
 
-	/* Turn on the I2C interrupt for current operation */
-	val = stu300_r8(dev->virtbase + I2C_CR);
-	val |= I2C_CR_INTERRUPT_ENABLE;
-	stu300_wr8(val, dev->virtbase + I2C_CR);
-
-	/* Twice paranoia (possible HW glitch) */
-	stu300_wr8(val, dev->virtbase + I2C_CR);
+	init_completion(&dev->cmd_complete);
 
-	/* Check again: is it already here? */
-	if (unlikely(stu300_event_occurred(dev, mr_event))) {
-		/* Disable IRQ again. */
-		val &= ~I2C_CR_INTERRUPT_ENABLE;
-		stu300_wr8(val, dev->virtbase + I2C_CR);
-		spin_unlock_irq(&dev->cmd_issue_lock);
-		goto exit_await_check_err;
-	}
+	/* Turn on the I2C interrupt for current operation */
+	stu300_irq_enable(dev);
 
 	/* Unlock the command block and wait for the event to occur */
 	spin_unlock_irq(&dev->cmd_issue_lock);
+
 	ret = wait_for_completion_interruptible_timeout(&dev->cmd_complete,
 							STU300_TIMEOUT);
-
 	if (ret < 0) {
 		dev_err(&dev->pdev->dev,
 		       "wait_for_completion_interruptible_timeout()"
@@ -401,7 +422,6 @@ static int stu300_await_event(struct stu300_dev *dev,
 		return -ETIMEDOUT;
 	}
 
- exit_await_check_err:
 	if (dev->cmd_err != STU300_ERROR_NONE) {
 		if (mr_event != STU300_EVENT_6) {
 			dev_err(&dev->pdev->dev, "controller "
@@ -457,18 +477,19 @@ struct stu300_clkset {
 };
 
 static const struct stu300_clkset stu300_clktable[] = {
-	{ 0, 0xFFU },
-	{ 2500000, I2C_OAR2_FR_25_10MHZ },
-	{ 10000000, I2C_OAR2_FR_10_1667MHZ },
-	{ 16670000, I2C_OAR2_FR_1667_2667MHZ },
-	{ 26670000, I2C_OAR2_FR_2667_40MHZ },
-	{ 40000000, I2C_OAR2_FR_40_5333MHZ },
-	{ 53330000, I2C_OAR2_FR_5333_66MHZ },
-	{ 66000000, I2C_OAR2_FR_66_80MHZ },
-	{ 80000000, I2C_OAR2_FR_80_100MHZ },
+	{ 0,         0xFFU },
+	{ 2500000,   I2C_OAR2_FR_25_10MHZ },
+	{ 10000000,  I2C_OAR2_FR_10_1667MHZ },
+	{ 16670000,  I2C_OAR2_FR_1667_2667MHZ },
+	{ 26670000,  I2C_OAR2_FR_2667_40MHZ },
+	{ 40000000,  I2C_OAR2_FR_40_5333MHZ },
+	{ 53330000,  I2C_OAR2_FR_5333_66MHZ },
+	{ 66000000,  I2C_OAR2_FR_66_80MHZ },
+	{ 80000000,  I2C_OAR2_FR_80_100MHZ },
 	{ 100000000, 0xFFU },
 };
 
+
 static int stu300_set_clk(struct stu300_dev *dev, unsigned long clkrate)
 {
 
@@ -494,10 +515,10 @@ static int stu300_set_clk(struct stu300_dev *dev, unsigned long clkrate)
 
 	if (dev->speed > 100000)
 		/* Fast Mode I2C */
-		val = ((clkrate/dev->speed)-9)/3;
+		val = ((clkrate/dev->speed) - 9)/3 + 1;
 	else
 		/* Standard Mode I2C */
-		val = ((clkrate/dev->speed)-7)/2;
+		val = ((clkrate/dev->speed) - 7)/2 + 1;
 
 	/* According to spec the divider must be > 2 */
 	if (val < 0x002) {
@@ -557,6 +578,7 @@ static int stu300_init_hw(struct stu300_dev *dev)
 	 */
 	clkrate = clk_get_rate(dev->clk);
 	ret = stu300_set_clk(dev, clkrate);
+
 	if (ret)
 		return ret;
 	/*
@@ -641,7 +663,6 @@ static int stu300_xfer_msg(struct i2c_adapter *adap,
 	int attempts = 0;
 	struct stu300_dev *dev = i2c_get_adapdata(adap);
 
-
 	clk_enable(dev->clk);
 
 	/* Remove this if (0) to trace each and every message. */
@@ -715,14 +736,15 @@ static int stu300_xfer_msg(struct i2c_adapter *adap,
 
 	if (attempts < NUM_ADDR_RESEND_ATTEMPTS && attempts > 0) {
 		dev_dbg(&dev->pdev->dev, "managed to get address "
-		       "through after %d attempts\n", attempts);
+			"through after %d attempts\n", attempts);
 	} else if (attempts == NUM_ADDR_RESEND_ATTEMPTS) {
 		dev_dbg(&dev->pdev->dev, "I give up, tried %d times "
-		       "to resend address.\n",
-		       NUM_ADDR_RESEND_ATTEMPTS);
+			"to resend address.\n",
+			NUM_ADDR_RESEND_ATTEMPTS);
 		goto exit_disable;
 	}
 
+
 	if (msg->flags & I2C_M_RD) {
 		/* READ: we read the actual bytes one at a time */
 		for (i = 0; i < msg->len; i++) {
@@ -804,8 +826,10 @@ static int stu300_xfer(struct i2c_adapter *adap, struct i2c_msg *msgs,
 {
 	int ret = -1;
 	int i;
+
 	struct stu300_dev *dev = i2c_get_adapdata(adap);
 	dev->msg_len = num;
+
 	for (i = 0; i < num; i++) {
 		/*
 		 * Another driver appears to send stop for each message,
@@ -817,6 +841,7 @@ static int stu300_xfer(struct i2c_adapter *adap, struct i2c_msg *msgs,
 		dev->msg_index = i;
 
 		ret = stu300_xfer_msg(adap, &msgs[i], (i == (num - 1)));
+
 		if (ret != 0) {
 			num = ret;
 			break;
@@ -845,6 +870,7 @@ stu300_probe(struct platform_device *pdev)
 	struct resource *res;
 	int bus_nr;
 	int ret = 0;
+	char clk_name[] = "I2C0";
 
 	dev = kzalloc(sizeof(struct stu300_dev), GFP_KERNEL);
 	if (!dev) {
@@ -854,7 +880,8 @@ stu300_probe(struct platform_device *pdev)
 	}
 
 	bus_nr = pdev->id;
-	dev->clk = clk_get(&pdev->dev, NULL);
+	clk_name[3] += (char)bus_nr;
+	dev->clk = clk_get(&pdev->dev, clk_name);
 	if (IS_ERR(dev->clk)) {
 		ret = PTR_ERR(dev->clk);
 		dev_err(&pdev->dev, "could not retrieve i2c bus clock\n");
diff --git a/drivers/i2c/chips/tsl2550.c b/drivers/i2c/chips/tsl2550.c
index 1a9cc135219f..b96f3025e588 100644
--- a/drivers/i2c/chips/tsl2550.c
+++ b/drivers/i2c/chips/tsl2550.c
@@ -27,7 +27,7 @@
 #include <linux/delay.h>
 
 #define TSL2550_DRV_NAME	"tsl2550"
-#define DRIVER_VERSION		"1.1.1"
+#define DRIVER_VERSION		"1.1.2"
 
 /*
  * Defines
@@ -189,13 +189,16 @@ static int tsl2550_calculate_lux(u8 ch0, u8 ch1)
 	u8 r = 128;
 
 	/* Avoid division by 0 and count 1 cannot be greater than count 0 */
-	if (c0 && (c1 <= c0))
-		r = c1 * 128 / c0;
+	if (c1 <= c0)
+		if (c0) {
+			r = c1 * 128 / c0;
+
+			/* Calculate LUX */
+			lux = ((c0 - c1) * ratio_lut[r]) / 256;
+		} else
+			lux = 0;
 	else
-		return -1;
-
-	/* Calculate LUX */
-	lux = ((c0 - c1) * ratio_lut[r]) / 256;
+		return -EAGAIN;
 
 	/* LUX range check */
 	return lux > TSL2550_MAX_LUX ? TSL2550_MAX_LUX : lux;
diff --git a/drivers/i2c/i2c-boardinfo.c b/drivers/i2c/i2c-boardinfo.c
index ffb35f09df03..a26a34a06641 100644
--- a/drivers/i2c/i2c-boardinfo.c
+++ b/drivers/i2c/i2c-boardinfo.c
@@ -18,6 +18,7 @@
 
 #include <linux/kernel.h>
 #include <linux/i2c.h>
+#include <linux/rwsem.h>
 
 #include "i2c-core.h"
 
@@ -25,7 +26,7 @@
 /* These symbols are exported ONLY FOR the i2c core.
  * No other users will be supported.
  */
-DEFINE_MUTEX(__i2c_board_lock);
+DECLARE_RWSEM(__i2c_board_lock);
 EXPORT_SYMBOL_GPL(__i2c_board_lock);
 
 LIST_HEAD(__i2c_board_list);
@@ -63,7 +64,7 @@ i2c_register_board_info(int busnum,
 {
 	int status;
 
-	mutex_lock(&__i2c_board_lock);
+	down_write(&__i2c_board_lock);
 
 	/* dynamic bus numbers will be assigned after the last static one */
 	if (busnum >= __i2c_first_dynamic_bus_num)
@@ -84,7 +85,7 @@ i2c_register_board_info(int busnum,
 		list_add_tail(&devinfo->list, &__i2c_board_list);
 	}
 
-	mutex_unlock(&__i2c_board_lock);
+	up_write(&__i2c_board_lock);
 
 	return status;
 }
diff --git a/drivers/i2c/i2c-core.c b/drivers/i2c/i2c-core.c
index 5ed622ee65c3..0e45c296d3d2 100644
--- a/drivers/i2c/i2c-core.c
+++ b/drivers/i2c/i2c-core.c
@@ -33,16 +33,20 @@
 #include <linux/completion.h>
 #include <linux/hardirq.h>
 #include <linux/irqflags.h>
+#include <linux/rwsem.h>
 #include <asm/uaccess.h>
 
 #include "i2c-core.h"
 
 
+/* core_lock protects i2c_adapter_idr, userspace_devices, and guarantees
+   that device detection, deletion of detected devices, and attach_adapter
+   and detach_adapter calls are serialized */
 static DEFINE_MUTEX(core_lock);
 static DEFINE_IDR(i2c_adapter_idr);
+static LIST_HEAD(userspace_devices);
 
-#define is_newstyle_driver(d) ((d)->probe || (d)->remove || (d)->detect)
-
+static int i2c_check_addr(struct i2c_adapter *adapter, int addr);
 static int i2c_detect(struct i2c_adapter *adapter, struct i2c_driver *driver);
 
 /* ------------------------------------------------------------------------- */
@@ -63,12 +67,6 @@ static int i2c_device_match(struct device *dev, struct device_driver *drv)
 	struct i2c_client	*client = to_i2c_client(dev);
 	struct i2c_driver	*driver = to_i2c_driver(drv);
 
-	/* make legacy i2c drivers bypass driver model probing entirely;
-	 * such drivers scan each i2c adapter/bus themselves.
-	 */
-	if (!is_newstyle_driver(driver))
-		return 0;
-
 	/* match on an id table if there is one */
 	if (driver->id_table)
 		return i2c_match_id(driver->id_table, client) != NULL;
@@ -83,10 +81,6 @@ static int i2c_device_uevent(struct device *dev, struct kobj_uevent_env *env)
 {
 	struct i2c_client	*client = to_i2c_client(dev);
 
-	/* by definition, legacy drivers can't hotplug */
-	if (dev->driver)
-		return 0;
-
 	if (add_uevent_var(env, "MODALIAS=%s%s",
 			   I2C_MODULE_PREFIX, client->name))
 		return -ENOMEM;
@@ -175,12 +169,6 @@ static int i2c_device_resume(struct device *dev)
 	return driver->resume(to_i2c_client(dev));
 }
 
-static void i2c_client_release(struct device *dev)
-{
-	struct i2c_client *client = to_i2c_client(dev);
-	complete(&client->released);
-}
-
 static void i2c_client_dev_release(struct device *dev)
 {
 	kfree(to_i2c_client(dev));
@@ -240,15 +228,17 @@ EXPORT_SYMBOL(i2c_verify_client);
 
 
 /**
- * i2c_new_device - instantiate an i2c device for use with a new style driver
+ * i2c_new_device - instantiate an i2c device
  * @adap: the adapter managing the device
  * @info: describes one I2C device; bus_num is ignored
  * Context: can sleep
  *
- * Create a device to work with a new style i2c driver, where binding is
- * handled through driver model probe()/remove() methods.  This call is not
- * appropriate for use by mainboad initialization logic, which usually runs
- * during an arch_initcall() long before any i2c_adapter could exist.
+ * Create an i2c device. Binding is handled through driver model
+ * probe()/remove() methods.  A driver may be bound to this device when we
+ * return from this function, or any later moment (e.g. maybe hotplugging will
+ * load the driver module).  This call is not appropriate for use by mainboard
+ * initialization logic, which usually runs during an arch_initcall() long
+ * before any i2c_adapter could exist.
  *
  * This returns the new i2c client, which may be saved for later use with
  * i2c_unregister_device(); or NULL to indicate an error.
@@ -276,17 +266,31 @@ i2c_new_device(struct i2c_adapter *adap, struct i2c_board_info const *info)
 
 	strlcpy(client->name, info->type, sizeof(client->name));
 
-	/* a new style driver may be bound to this device when we
-	 * return from this function, or any later moment (e.g. maybe
-	 * hotplugging will load the driver module).  and the device
-	 * refcount model is the standard driver model one.
-	 */
-	status = i2c_attach_client(client);
-	if (status < 0) {
-		kfree(client);
-		client = NULL;
-	}
+	/* Check for address business */
+	status = i2c_check_addr(adap, client->addr);
+	if (status)
+		goto out_err;
+
+	client->dev.parent = &client->adapter->dev;
+	client->dev.bus = &i2c_bus_type;
+	client->dev.release = i2c_client_dev_release;
+
+	dev_set_name(&client->dev, "%d-%04x", i2c_adapter_id(adap),
+		     client->addr);
+	status = device_register(&client->dev);
+	if (status)
+		goto out_err;
+
+	dev_dbg(&adap->dev, "client [%s] registered with bus id %s\n",
+		client->name, dev_name(&client->dev));
+
 	return client;
+
+out_err:
+	dev_err(&adap->dev, "Failed to register i2c client %s at 0x%02x "
+		"(%d)\n", client->name, client->addr, status);
+	kfree(client);
+	return NULL;
 }
 EXPORT_SYMBOL_GPL(i2c_new_device);
 
@@ -298,28 +302,6 @@ EXPORT_SYMBOL_GPL(i2c_new_device);
  */
 void i2c_unregister_device(struct i2c_client *client)
 {
-	struct i2c_adapter	*adapter = client->adapter;
-	struct i2c_driver	*driver = client->driver;
-
-	if (driver && !is_newstyle_driver(driver)) {
-		dev_err(&client->dev, "can't unregister devices "
-			"with legacy drivers\n");
-		WARN_ON(1);
-		return;
-	}
-
-	if (adapter->client_unregister) {
-		if (adapter->client_unregister(client)) {
-			dev_warn(&client->dev,
-				 "client_unregister [%s] failed\n",
-				 client->name);
-		}
-	}
-
-	mutex_lock(&adapter->clist_lock);
-	list_del(&client->list);
-	mutex_unlock(&adapter->clist_lock);
-
 	device_unregister(&client->dev);
 }
 EXPORT_SYMBOL_GPL(i2c_unregister_device);
@@ -393,8 +375,128 @@ show_adapter_name(struct device *dev, struct device_attribute *attr, char *buf)
 	return sprintf(buf, "%s\n", adap->name);
 }
 
+/*
+ * Let users instantiate I2C devices through sysfs. This can be used when
+ * platform initialization code doesn't contain the proper data for
+ * whatever reason. Also useful for drivers that do device detection and
+ * detection fails, either because the device uses an unexpected address,
+ * or this is a compatible device with different ID register values.
+ *
+ * Parameter checking may look overzealous, but we really don't want
+ * the user to provide incorrect parameters.
+ */
+static ssize_t
+i2c_sysfs_new_device(struct device *dev, struct device_attribute *attr,
+		     const char *buf, size_t count)
+{
+	struct i2c_adapter *adap = to_i2c_adapter(dev);
+	struct i2c_board_info info;
+	struct i2c_client *client;
+	char *blank, end;
+	int res;
+
+	dev_warn(dev, "The new_device interface is still experimental "
+		 "and may change in a near future\n");
+	memset(&info, 0, sizeof(struct i2c_board_info));
+
+	blank = strchr(buf, ' ');
+	if (!blank) {
+		dev_err(dev, "%s: Missing parameters\n", "new_device");
+		return -EINVAL;
+	}
+	if (blank - buf > I2C_NAME_SIZE - 1) {
+		dev_err(dev, "%s: Invalid device name\n", "new_device");
+		return -EINVAL;
+	}
+	memcpy(info.type, buf, blank - buf);
+
+	/* Parse remaining parameters, reject extra parameters */
+	res = sscanf(++blank, "%hi%c", &info.addr, &end);
+	if (res < 1) {
+		dev_err(dev, "%s: Can't parse I2C address\n", "new_device");
+		return -EINVAL;
+	}
+	if (res > 1  && end != '\n') {
+		dev_err(dev, "%s: Extra parameters\n", "new_device");
+		return -EINVAL;
+	}
+
+	if (info.addr < 0x03 || info.addr > 0x77) {
+		dev_err(dev, "%s: Invalid I2C address 0x%hx\n", "new_device",
+			info.addr);
+		return -EINVAL;
+	}
+
+	client = i2c_new_device(adap, &info);
+	if (!client)
+		return -EEXIST;
+
+	/* Keep track of the added device */
+	mutex_lock(&core_lock);
+	list_add_tail(&client->detected, &userspace_devices);
+	mutex_unlock(&core_lock);
+	dev_info(dev, "%s: Instantiated device %s at 0x%02hx\n", "new_device",
+		 info.type, info.addr);
+
+	return count;
+}
+
+/*
+ * And of course let the users delete the devices they instantiated, if
+ * they got it wrong. This interface can only be used to delete devices
+ * instantiated by i2c_sysfs_new_device above. This guarantees that we
+ * don't delete devices to which some kernel code still has references.
+ *
+ * Parameter checking may look overzealous, but we really don't want
+ * the user to delete the wrong device.
+ */
+static ssize_t
+i2c_sysfs_delete_device(struct device *dev, struct device_attribute *attr,
+			const char *buf, size_t count)
+{
+	struct i2c_adapter *adap = to_i2c_adapter(dev);
+	struct i2c_client *client, *next;
+	unsigned short addr;
+	char end;
+	int res;
+
+	/* Parse parameters, reject extra parameters */
+	res = sscanf(buf, "%hi%c", &addr, &end);
+	if (res < 1) {
+		dev_err(dev, "%s: Can't parse I2C address\n", "delete_device");
+		return -EINVAL;
+	}
+	if (res > 1  && end != '\n') {
+		dev_err(dev, "%s: Extra parameters\n", "delete_device");
+		return -EINVAL;
+	}
+
+	/* Make sure the device was added through sysfs */
+	res = -ENOENT;
+	mutex_lock(&core_lock);
+	list_for_each_entry_safe(client, next, &userspace_devices, detected) {
+		if (client->addr == addr && client->adapter == adap) {
+			dev_info(dev, "%s: Deleting device %s at 0x%02hx\n",
+				 "delete_device", client->name, client->addr);
+
+			list_del(&client->detected);
+			i2c_unregister_device(client);
+			res = count;
+			break;
+		}
+	}
+	mutex_unlock(&core_lock);
+
+	if (res < 0)
+		dev_err(dev, "%s: Can't find device in list\n",
+			"delete_device");
+	return res;
+}
+
 static struct device_attribute i2c_adapter_attrs[] = {
 	__ATTR(name, S_IRUGO, show_adapter_name, NULL),
+	__ATTR(new_device, S_IWUSR, NULL, i2c_sysfs_new_device),
+	__ATTR(delete_device, S_IWUSR, NULL, i2c_sysfs_delete_device),
 	{ },
 };
 
@@ -408,7 +510,7 @@ static void i2c_scan_static_board_info(struct i2c_adapter *adapter)
 {
 	struct i2c_devinfo	*devinfo;
 
-	mutex_lock(&__i2c_board_lock);
+	down_read(&__i2c_board_lock);
 	list_for_each_entry(devinfo, &__i2c_board_list, list) {
 		if (devinfo->busnum == adapter->nr
 				&& !i2c_new_device(adapter,
@@ -417,7 +519,7 @@ static void i2c_scan_static_board_info(struct i2c_adapter *adapter)
 				"Can't create device at 0x%02x\n",
 				devinfo->board_info.addr);
 	}
-	mutex_unlock(&__i2c_board_lock);
+	up_read(&__i2c_board_lock);
 }
 
 static int i2c_do_add_adapter(struct device_driver *d, void *data)
@@ -441,14 +543,12 @@ static int i2c_register_adapter(struct i2c_adapter *adap)
 	int res = 0, dummy;
 
 	/* Can't register until after driver model init */
-	if (unlikely(WARN_ON(!i2c_bus_type.p)))
-		return -EAGAIN;
+	if (unlikely(WARN_ON(!i2c_bus_type.p))) {
+		res = -EAGAIN;
+		goto out_list;
+	}
 
 	mutex_init(&adap->bus_lock);
-	mutex_init(&adap->clist_lock);
-	INIT_LIST_HEAD(&adap->clients);
-
-	mutex_lock(&core_lock);
 
 	/* Set default timeout to 1 second if not already set */
 	if (adap->timeout == 0)
@@ -463,21 +563,23 @@ static int i2c_register_adapter(struct i2c_adapter *adap)
 
 	dev_dbg(&adap->dev, "adapter [%s] registered\n", adap->name);
 
-	/* create pre-declared device nodes for new-style drivers */
+	/* create pre-declared device nodes */
 	if (adap->nr < __i2c_first_dynamic_bus_num)
 		i2c_scan_static_board_info(adap);
 
 	/* Notify drivers */
+	mutex_lock(&core_lock);
 	dummy = bus_for_each_drv(&i2c_bus_type, NULL, adap,
 				 i2c_do_add_adapter);
-
-out_unlock:
 	mutex_unlock(&core_lock);
-	return res;
+
+	return 0;
 
 out_list:
+	mutex_lock(&core_lock);
 	idr_remove(&i2c_adapter_idr, adap->nr);
-	goto out_unlock;
+	mutex_unlock(&core_lock);
+	return res;
 }
 
 /**
@@ -596,6 +698,14 @@ static int i2c_do_del_adapter(struct device_driver *d, void *data)
 	return res;
 }
 
+static int __unregister_client(struct device *dev, void *dummy)
+{
+	struct i2c_client *client = i2c_verify_client(dev);
+	if (client)
+		i2c_unregister_device(client);
+	return 0;
+}
+
 /**
  * i2c_del_adapter - unregister I2C adapter
  * @adap: the adapter being unregistered
@@ -606,46 +716,30 @@ static int i2c_do_del_adapter(struct device_driver *d, void *data)
  */
 int i2c_del_adapter(struct i2c_adapter *adap)
 {
-	struct i2c_client *client, *_n;
 	int res = 0;
-
-	mutex_lock(&core_lock);
+	struct i2c_adapter *found;
 
 	/* First make sure that this adapter was ever added */
-	if (idr_find(&i2c_adapter_idr, adap->nr) != adap) {
+	mutex_lock(&core_lock);
+	found = idr_find(&i2c_adapter_idr, adap->nr);
+	mutex_unlock(&core_lock);
+	if (found != adap) {
 		pr_debug("i2c-core: attempting to delete unregistered "
 			 "adapter [%s]\n", adap->name);
-		res = -EINVAL;
-		goto out_unlock;
+		return -EINVAL;
 	}
 
 	/* Tell drivers about this removal */
+	mutex_lock(&core_lock);
 	res = bus_for_each_drv(&i2c_bus_type, NULL, adap,
 			       i2c_do_del_adapter);
+	mutex_unlock(&core_lock);
 	if (res)
-		goto out_unlock;
-
-	/* detach any active clients. This must be done first, because
-	 * it can fail; in which case we give up. */
-	list_for_each_entry_safe_reverse(client, _n, &adap->clients, list) {
-		struct i2c_driver	*driver;
-
-		driver = client->driver;
-
-		/* new style, follow standard driver model */
-		if (!driver || is_newstyle_driver(driver)) {
-			i2c_unregister_device(client);
-			continue;
-		}
+		return res;
 
-		/* legacy drivers create and remove clients themselves */
-		if ((res = driver->detach_client(client))) {
-			dev_err(&adap->dev, "detach_client failed for client "
-				"[%s] at address 0x%02x\n", client->name,
-				client->addr);
-			goto out_unlock;
-		}
-	}
+	/* Detach any active clients. This can't fail, thus we do not
+	   checking the returned value. */
+	res = device_for_each_child(&adap->dev, NULL, __unregister_client);
 
 	/* clean up the sysfs representation */
 	init_completion(&adap->dev_released);
@@ -655,7 +749,9 @@ int i2c_del_adapter(struct i2c_adapter *adap)
 	wait_for_completion(&adap->dev_released);
 
 	/* free bus id */
+	mutex_lock(&core_lock);
 	idr_remove(&i2c_adapter_idr, adap->nr);
+	mutex_unlock(&core_lock);
 
 	dev_dbg(&adap->dev, "adapter [%s] unregistered\n", adap->name);
 
@@ -663,9 +759,7 @@ int i2c_del_adapter(struct i2c_adapter *adap)
 	   added again */
 	memset(&adap->dev, 0, sizeof(adap->dev));
 
- out_unlock:
-	mutex_unlock(&core_lock);
-	return res;
+	return 0;
 }
 EXPORT_SYMBOL(i2c_del_adapter);
 
@@ -688,11 +782,7 @@ static int __attach_adapter(struct device *dev, void *data)
 
 /*
  * An i2c_driver is used with one or more i2c_client (device) nodes to access
- * i2c slave chips, on a bus instance associated with some i2c_adapter.  There
- * are two models for binding the driver to its device:  "new style" drivers
- * follow the standard Linux driver model and just respond to probe() calls
- * issued if the driver core sees they match(); "legacy" drivers create device
- * nodes themselves.
+ * i2c slave chips, on a bus instance associated with some i2c_adapter.
  */
 
 int i2c_register_driver(struct module *owner, struct i2c_driver *driver)
@@ -703,37 +793,26 @@ int i2c_register_driver(struct module *owner, struct i2c_driver *driver)
 	if (unlikely(WARN_ON(!i2c_bus_type.p)))
 		return -EAGAIN;
 
-	/* new style driver methods can't mix with legacy ones */
-	if (is_newstyle_driver(driver)) {
-		if (driver->detach_adapter || driver->detach_client) {
-			printk(KERN_WARNING
-					"i2c-core: driver [%s] is confused\n",
-					driver->driver.name);
-			return -EINVAL;
-		}
-	}
-
 	/* add the driver to the list of i2c drivers in the driver core */
 	driver->driver.owner = owner;
 	driver->driver.bus = &i2c_bus_type;
 
-	/* for new style drivers, when registration returns the driver core
+	/* When registration returns, the driver core
 	 * will have called probe() for all matching-but-unbound devices.
 	 */
 	res = driver_register(&driver->driver);
 	if (res)
 		return res;
 
-	mutex_lock(&core_lock);
-
 	pr_debug("i2c-core: driver [%s] registered\n", driver->driver.name);
 
 	INIT_LIST_HEAD(&driver->clients);
 	/* Walk the adapters that are already present */
+	mutex_lock(&core_lock);
 	class_for_each_device(&i2c_adapter_class, NULL, driver,
 			      __attach_adapter);
-
 	mutex_unlock(&core_lock);
+
 	return 0;
 }
 EXPORT_SYMBOL(i2c_register_driver);
@@ -753,32 +832,11 @@ static int __detach_adapter(struct device *dev, void *data)
 		i2c_unregister_device(client);
 	}
 
-	if (is_newstyle_driver(driver))
-		return 0;
-
-	/* Have a look at each adapter, if clients of this driver are still
-	 * attached. If so, detach them to be able to kill the driver
-	 * afterwards.
-	 */
 	if (driver->detach_adapter) {
 		if (driver->detach_adapter(adapter))
 			dev_err(&adapter->dev,
 				"detach_adapter failed for driver [%s]\n",
 				driver->driver.name);
-	} else {
-		struct i2c_client *client, *_n;
-
-		list_for_each_entry_safe(client, _n, &adapter->clients, list) {
-			if (client->driver != driver)
-				continue;
-			dev_dbg(&adapter->dev,
-				"detaching client [%s] at 0x%02x\n",
-				client->name, client->addr);
-			if (driver->detach_client(client))
-				dev_err(&adapter->dev, "detach_client "
-					"failed for client [%s] at 0x%02x\n",
-					client->name, client->addr);
-		}
 	}
 
 	return 0;
@@ -792,14 +850,12 @@ static int __detach_adapter(struct device *dev, void *data)
 void i2c_del_driver(struct i2c_driver *driver)
 {
 	mutex_lock(&core_lock);
-
 	class_for_each_device(&i2c_adapter_class, NULL, driver,
 			      __detach_adapter);
+	mutex_unlock(&core_lock);
 
 	driver_unregister(&driver->driver);
 	pr_debug("i2c-core: driver [%s] unregistered\n", driver->driver.name);
-
-	mutex_unlock(&core_lock);
 }
 EXPORT_SYMBOL(i2c_del_driver);
 
@@ -820,86 +876,6 @@ static int i2c_check_addr(struct i2c_adapter *adapter, int addr)
 	return device_for_each_child(&adapter->dev, &addr, __i2c_check_addr);
 }
 
-int i2c_attach_client(struct i2c_client *client)
-{
-	struct i2c_adapter *adapter = client->adapter;
-	int res;
-
-	/* Check for address business */
-	res = i2c_check_addr(adapter, client->addr);
-	if (res)
-		return res;
-
-	client->dev.parent = &client->adapter->dev;
-	client->dev.bus = &i2c_bus_type;
-
-	if (client->driver)
-		client->dev.driver = &client->driver->driver;
-
-	if (client->driver && !is_newstyle_driver(client->driver)) {
-		client->dev.release = i2c_client_release;
-		dev_set_uevent_suppress(&client->dev, 1);
-	} else
-		client->dev.release = i2c_client_dev_release;
-
-	dev_set_name(&client->dev, "%d-%04x", i2c_adapter_id(adapter),
-		     client->addr);
-	res = device_register(&client->dev);
-	if (res)
-		goto out_err;
-
-	mutex_lock(&adapter->clist_lock);
-	list_add_tail(&client->list, &adapter->clients);
-	mutex_unlock(&adapter->clist_lock);
-
-	dev_dbg(&adapter->dev, "client [%s] registered with bus id %s\n",
-		client->name, dev_name(&client->dev));
-
-	if (adapter->client_register)  {
-		if (adapter->client_register(client)) {
-			dev_dbg(&adapter->dev, "client_register "
-				"failed for client [%s] at 0x%02x\n",
-				client->name, client->addr);
-		}
-	}
-
-	return 0;
-
-out_err:
-	dev_err(&adapter->dev, "Failed to attach i2c client %s at 0x%02x "
-		"(%d)\n", client->name, client->addr, res);
-	return res;
-}
-EXPORT_SYMBOL(i2c_attach_client);
-
-int i2c_detach_client(struct i2c_client *client)
-{
-	struct i2c_adapter *adapter = client->adapter;
-	int res = 0;
-
-	if (adapter->client_unregister)  {
-		res = adapter->client_unregister(client);
-		if (res) {
-			dev_err(&client->dev,
-				"client_unregister [%s] failed, "
-				"client not detached\n", client->name);
-			goto out;
-		}
-	}
-
-	mutex_lock(&adapter->clist_lock);
-	list_del(&client->list);
-	mutex_unlock(&adapter->clist_lock);
-
-	init_completion(&client->released);
-	device_unregister(&client->dev);
-	wait_for_completion(&client->released);
-
- out:
-	return res;
-}
-EXPORT_SYMBOL(i2c_detach_client);
-
 /**
  * i2c_use_client - increments the reference count of the i2c client structure
  * @client: the client being referenced
@@ -1129,144 +1105,7 @@ EXPORT_SYMBOL(i2c_master_recv);
  * Will not work for 10-bit addresses!
  * ----------------------------------------------------
  */
-static int i2c_probe_address(struct i2c_adapter *adapter, int addr, int kind,
-			     int (*found_proc) (struct i2c_adapter *, int, int))
-{
-	int err;
-
-	/* Make sure the address is valid */
-	if (addr < 0x03 || addr > 0x77) {
-		dev_warn(&adapter->dev, "Invalid probe address 0x%02x\n",
-			 addr);
-		return -EINVAL;
-	}
-
-	/* Skip if already in use */
-	if (i2c_check_addr(adapter, addr))
-		return 0;
-
-	/* Make sure there is something at this address, unless forced */
-	if (kind < 0) {
-		if (i2c_smbus_xfer(adapter, addr, 0, 0, 0,
-				   I2C_SMBUS_QUICK, NULL) < 0)
-			return 0;
-
-		/* prevent 24RF08 corruption */
-		if ((addr & ~0x0f) == 0x50)
-			i2c_smbus_xfer(adapter, addr, 0, 0, 0,
-				       I2C_SMBUS_QUICK, NULL);
-	}
-
-	/* Finally call the custom detection function */
-	err = found_proc(adapter, addr, kind);
-	/* -ENODEV can be returned if there is a chip at the given address
-	   but it isn't supported by this chip driver. We catch it here as
-	   this isn't an error. */
-	if (err == -ENODEV)
-		err = 0;
-
-	if (err)
-		dev_warn(&adapter->dev, "Client creation failed at 0x%x (%d)\n",
-			 addr, err);
-	return err;
-}
-
-int i2c_probe(struct i2c_adapter *adapter,
-	      const struct i2c_client_address_data *address_data,
-	      int (*found_proc) (struct i2c_adapter *, int, int))
-{
-	int i, err;
-	int adap_id = i2c_adapter_id(adapter);
-
-	/* Force entries are done first, and are not affected by ignore
-	   entries */
-	if (address_data->forces) {
-		const unsigned short * const *forces = address_data->forces;
-		int kind;
-
-		for (kind = 0; forces[kind]; kind++) {
-			for (i = 0; forces[kind][i] != I2C_CLIENT_END;
-			     i += 2) {
-				if (forces[kind][i] == adap_id
-				 || forces[kind][i] == ANY_I2C_BUS) {
-					dev_dbg(&adapter->dev, "found force "
-						"parameter for adapter %d, "
-						"addr 0x%02x, kind %d\n",
-						adap_id, forces[kind][i + 1],
-						kind);
-					err = i2c_probe_address(adapter,
-						forces[kind][i + 1],
-						kind, found_proc);
-					if (err)
-						return err;
-				}
-			}
-		}
-	}
-
-	/* Stop here if we can't use SMBUS_QUICK */
-	if (!i2c_check_functionality(adapter, I2C_FUNC_SMBUS_QUICK)) {
-		if (address_data->probe[0] == I2C_CLIENT_END
-		 && address_data->normal_i2c[0] == I2C_CLIENT_END)
-			return 0;
-
-		dev_dbg(&adapter->dev, "SMBus Quick command not supported, "
-			"can't probe for chips\n");
-		return -EOPNOTSUPP;
-	}
-
-	/* Probe entries are done second, and are not affected by ignore
-	   entries either */
-	for (i = 0; address_data->probe[i] != I2C_CLIENT_END; i += 2) {
-		if (address_data->probe[i] == adap_id
-		 || address_data->probe[i] == ANY_I2C_BUS) {
-			dev_dbg(&adapter->dev, "found probe parameter for "
-				"adapter %d, addr 0x%02x\n", adap_id,
-				address_data->probe[i + 1]);
-			err = i2c_probe_address(adapter,
-						address_data->probe[i + 1],
-						-1, found_proc);
-			if (err)
-				return err;
-		}
-	}
-
-	/* Normal entries are done last, unless shadowed by an ignore entry */
-	for (i = 0; address_data->normal_i2c[i] != I2C_CLIENT_END; i += 1) {
-		int j, ignore;
-
-		ignore = 0;
-		for (j = 0; address_data->ignore[j] != I2C_CLIENT_END;
-		     j += 2) {
-			if ((address_data->ignore[j] == adap_id ||
-			     address_data->ignore[j] == ANY_I2C_BUS)
-			 && address_data->ignore[j + 1]
-			    == address_data->normal_i2c[i]) {
-				dev_dbg(&adapter->dev, "found ignore "
-					"parameter for adapter %d, "
-					"addr 0x%02x\n", adap_id,
-					address_data->ignore[j + 1]);
-				ignore = 1;
-				break;
-			}
-		}
-		if (ignore)
-			continue;
-
-		dev_dbg(&adapter->dev, "found normal entry for adapter %d, "
-			"addr 0x%02x\n", adap_id,
-			address_data->normal_i2c[i]);
-		err = i2c_probe_address(adapter, address_data->normal_i2c[i],
-					-1, found_proc);
-		if (err)
-			return err;
-	}
-
-	return 0;
-}
-EXPORT_SYMBOL(i2c_probe);
 
-/* Separate detection function for new-style drivers */
 static int i2c_detect_address(struct i2c_client *temp_client, int kind,
 			      struct i2c_driver *driver)
 {
diff --git a/drivers/i2c/i2c-core.h b/drivers/i2c/i2c-core.h
index cd5bff874855..9f9c57ff6708 100644
--- a/drivers/i2c/i2c-core.h
+++ b/drivers/i2c/i2c-core.h
@@ -16,6 +16,8 @@
  * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
  */
 
+#include <linux/rwsem.h>
+
 struct i2c_devinfo {
 	struct list_head	list;
 	int			busnum;
@@ -25,7 +27,7 @@ struct i2c_devinfo {
 /* board_lock protects board_list and first_dynamic_bus_num.
  * only i2c core components are allowed to use these symbols.
  */
-extern struct mutex	__i2c_board_lock;
+extern struct rw_semaphore	__i2c_board_lock;
 extern struct list_head	__i2c_board_list;
 extern int		__i2c_first_dynamic_bus_num;