drivers/i2c/i2c_lpc11u6x.c - third_party/github/zephyrproject-rtos/zephyr - Git at Google

 /*
  * Copyright (c) 2020, Seagate Technology LLC
  *
  * SPDX-License-Identifier: Apache-2.0
  */

 #define DT_DRV_COMPAT nxp_lpc11u6x_i2c

 #include <kernel.h>
 #include <drivers/i2c.h>
 #include <drivers/pinmux.h>
 #include <drivers/clock_control.h>
 #include <dt-bindings/pinctrl/lpc11u6x-pinctrl.h>
 #include "i2c_lpc11u6x.h"

 #define DEV_BASE(dev) (((struct lpc11u6x_i2c_config *)(dev->config))->base)

 static void lpc11u6x_i2c_set_bus_speed(const struct lpc11u6x_i2c_config *cfg,
 				       const struct device *clk_dev,
 				       uint32_t speed)
 {
 	uint32_t clk, div;

 	clock_control_get_rate(clk_dev, (clock_control_subsys_t) cfg->clkid,
 			       &clk);
 	div = clk / speed;

 	cfg->base->sclh = div / 2;
 	cfg->base->scll = div - (div / 2);
 }

 static int lpc11u6x_i2c_configure(const struct device *dev,
 				  uint32_t dev_config)
 {
 	const struct lpc11u6x_i2c_config *cfg = dev->config;
 	struct lpc11u6x_i2c_data *data = dev->data;
 	const struct device *clk_dev, *pinmux_dev;
 	uint32_t speed, flags = 0;

 	switch (I2C_SPEED_GET(dev_config)) {
 	case I2C_SPEED_STANDARD:
 		speed = 100000;
 		break;
 	case I2C_SPEED_FAST:
 		speed = 400000;
 		break;
 	case I2C_SPEED_FAST_PLUS:
 		flags |= IOCON_FASTI2C_EN;
 		speed = 1000000;
 		break;
 	case I2C_SPEED_HIGH:
 	case I2C_SPEED_ULTRA:
 		return -ENOTSUP;
 	default:
 		return -EINVAL;
 	}

 	if (dev_config & I2C_ADDR_10_BITS) {
 		return -ENOTSUP;
 	}

 	clk_dev = device_get_binding(cfg->clock_drv);
 	if (!clk_dev) {
 		return -EINVAL;
 	}

 	k_mutex_lock(&data->mutex, K_FOREVER);
 	lpc11u6x_i2c_set_bus_speed(cfg, clk_dev, speed);

 	if (!flags) {
 		goto exit;
 	}

 	pinmux_dev = device_get_binding(cfg->scl_pinmux_drv);
 	if (!pinmux_dev) {
 		goto err;
 	}
 	pinmux_pin_set(pinmux_dev, cfg->scl_pin, cfg->scl_flags | flags);

 	pinmux_dev = device_get_binding(cfg->sda_pinmux_drv);
 	if (!pinmux_dev) {
 		goto err;
 	}
 	pinmux_pin_set(pinmux_dev, cfg->sda_pin, cfg->sda_flags | flags);

 exit:
 	k_mutex_unlock(&data->mutex);
 	return 0;
 err:
 	k_mutex_unlock(&data->mutex);
 	return -EINVAL;
 }

 static int lpc11u6x_i2c_transfer(const struct device *dev,
 				 struct i2c_msg *msgs,
 				 uint8_t num_msgs, uint16_t addr)
 {
 	const struct lpc11u6x_i2c_config *cfg = dev->config;
 	struct lpc11u6x_i2c_data *data = dev->data;
 	int ret = 0;

 	if (!num_msgs) {
 		return 0;
 	}

 	k_mutex_lock(&data->mutex, K_FOREVER);

 	data->transfer.msgs = msgs;
 	data->transfer.curr_buf = msgs->buf;
 	data->transfer.curr_len = msgs->len;
 	data->transfer.nr_msgs = num_msgs;
 	data->transfer.addr = addr;

 	/* Reset all control bits */
 	cfg->base->con_clr = LPC11U6X_I2C_CONTROL_SI |
 		LPC11U6X_I2C_CONTROL_STOP | LPC11U6X_I2C_CONTROL_START;

 	/* Send start and wait for completion */
 	data->transfer.status = LPC11U6X_I2C_STATUS_BUSY;
 	cfg->base->con_set = LPC11U6X_I2C_CONTROL_START;

 	k_sem_take(&data->completion, K_FOREVER);

 	if (data->transfer.status != LPC11U6X_I2C_STATUS_OK) {
 		ret = -EIO;
 	}
 	data->transfer.status = LPC11U6X_I2C_STATUS_INACTIVE;

 	/* If a slave is registered, put the controller in slave mode */
 	if (data->slave) {
 		cfg->base->con_set = LPC11U6X_I2C_CONTROL_AA;
 	}

 	k_mutex_unlock(&data->mutex);
 	return ret;
 }

 static int lpc11u6x_i2c_slave_register(const struct device *dev,
 				       struct i2c_slave_config *cfg)
 {
 	const struct lpc11u6x_i2c_config *dev_cfg = dev->config;
 	struct lpc11u6x_i2c_data *data = dev->data;
 	int ret = 0;

 	if (!cfg) {
 		return -EINVAL;
 	}

 	if (cfg->flags & I2C_SLAVE_FLAGS_ADDR_10_BITS) {
 		return -ENOTSUP;
 	}

 	k_mutex_lock(&data->mutex, K_FOREVER);
 	if (data->slave) {
 		ret = -EBUSY;
 		goto exit;
 	}

 	data->slave = cfg;
 	/* Configure controller to act as slave */
 	dev_cfg->base->addr0 = (cfg->address << 1);
 	dev_cfg->base->con_clr = LPC11U6X_I2C_CONTROL_START |
 		LPC11U6X_I2C_CONTROL_STOP | LPC11U6X_I2C_CONTROL_SI;
 	dev_cfg->base->con_set = LPC11U6X_I2C_CONTROL_AA;

 exit:
 	k_mutex_unlock(&data->mutex);
 	return ret;
 }


 static int lpc11u6x_i2c_slave_unregister(const struct device *dev,
 					 struct i2c_slave_config *cfg)
 {
 	const struct lpc11u6x_i2c_config *dev_cfg = dev->config;
 	struct lpc11u6x_i2c_data *data = dev->data;

 	if (!cfg) {
 		return -EINVAL;
 	}
 	if (data->slave != cfg) {
 		return -EINVAL;
 	}

 	k_mutex_lock(&data->mutex, K_FOREVER);
 	data->slave = NULL;
 	dev_cfg->base->con_clr = LPC11U6X_I2C_CONTROL_AA;
 	k_mutex_unlock(&data->mutex);

 	return 0;
 }

 static void lpc11u6x_i2c_isr(const struct device *dev)
 {
 	struct lpc11u6x_i2c_data *data = dev->data;
 	struct lpc11u6x_i2c_regs *i2c = DEV_BASE(dev);
 	struct lpc11u6x_i2c_current_transfer *transfer = &data->transfer;
 	uint32_t clear = LPC11U6X_I2C_CONTROL_SI;
 	uint32_t set = 0;
 	uint8_t val;

 	switch (i2c->stat) {
 		/* Master TX states */
 	case LPC11U6X_I2C_MASTER_TX_START:
 	case LPC11U6X_I2C_MASTER_TX_RESTART:
 		i2c->dat = (transfer->addr << 1) |
 			(transfer->msgs->flags & I2C_MSG_READ);
 		clear |= LPC11U6X_I2C_CONTROL_START;
 		transfer->curr_buf = transfer->msgs->buf;
 		transfer->curr_len = transfer->msgs->len;
 		break;

 	case LPC11U6X_I2C_MASTER_TX_ADR_ACK:
 	case LPC11U6X_I2C_MASTER_TX_DAT_ACK:
 		if (!transfer->curr_len) {
 			transfer->msgs++;
 			transfer->nr_msgs--;
 			if (!transfer->nr_msgs) {
 				transfer->status = LPC11U6X_I2C_STATUS_OK;
 				set |= LPC11U6X_I2C_CONTROL_STOP;
 			} else {
 				set |= LPC11U6X_I2C_CONTROL_START;
 			}
 		} else {
 			i2c->dat = transfer->curr_buf[0];
 			transfer->curr_buf++;
 			transfer->curr_len--;
 		}
 		break;

 		/* Master RX states */
 	case LPC11U6X_I2C_MASTER_RX_DAT_NACK:
 		transfer->msgs++;
 		transfer->nr_msgs--;
 		set |= (transfer->nr_msgs ? LPC11U6X_I2C_CONTROL_START :
 				LPC11U6X_I2C_CONTROL_STOP);
 		if (!transfer->nr_msgs) {
 			transfer->status = LPC11U6X_I2C_STATUS_OK;
 		}
 		__fallthrough;
 	case LPC11U6X_I2C_MASTER_RX_DAT_ACK:
 		transfer->curr_buf[0] = i2c->dat;
 		transfer->curr_buf++;
 		transfer->curr_len--;
 		__fallthrough;
 	case LPC11U6X_I2C_MASTER_RX_ADR_ACK:
 		if (transfer->curr_len <= 1) {
 			clear |= LPC11U6X_I2C_CONTROL_AA;
 		} else {
 			set |= LPC11U6X_I2C_CONTROL_AA;
 		}
 		break;

 		/* Slave States */
 	case LPC11U6X_I2C_SLAVE_RX_ADR_ACK:
 	case LPC11U6X_I2C_SLAVE_RX_ARB_LOST_ADR_ACK:
 	case LPC11U6X_I2C_SLAVE_RX_GC_ACK:
 	case LPC11U6X_I2C_SLAVE_RX_ARB_LOST_GC_ACK:
 		if (data->slave->callbacks->write_requested(data->slave)) {
 			clear |= LPC11U6X_I2C_CONTROL_AA;
 		}
 		break;

 	case LPC11U6X_I2C_SLAVE_RX_DAT_ACK:
 	case LPC11U6X_I2C_SLAVE_RX_GC_DAT_ACK:
 		val = i2c->dat;
 		if (data->slave->callbacks->write_received(data->slave, val)) {
 			clear |= LPC11U6X_I2C_CONTROL_AA;
 		}
 		break;

 	case LPC11U6X_I2C_SLAVE_RX_DAT_NACK:
 	case LPC11U6X_I2C_SLAVE_RX_GC_DAT_NACK:
 		val = i2c->dat;
 		data->slave->callbacks->write_received(data->slave, val);
 		data->slave->callbacks->stop(data->slave);
 		set |= LPC11U6X_I2C_CONTROL_AA;
 		break;

 	case LPC11U6X_I2C_SLAVE_RX_STOP:
 		data->slave->callbacks->stop(data->slave);
 		set |= LPC11U6X_I2C_CONTROL_AA;
 		break;

 	case LPC11U6X_I2C_SLAVE_TX_ADR_ACK:
 	case LPC11U6X_I2C_SLAVE_TX_ARB_LOST_ADR_ACK:
 		if (data->slave->callbacks->read_requested(data->slave, &val)) {
 			clear |= LPC11U6X_I2C_CONTROL_AA;
 		}
 		i2c->dat = val;
 		break;
 	case LPC11U6X_I2C_SLAVE_TX_DAT_ACK:
 		if (data->slave->callbacks->read_processed(data->slave, &val)) {
 			clear |= LPC11U6X_I2C_CONTROL_AA;
 		}
 		i2c->dat = val;
 		break;
 	case LPC11U6X_I2C_SLAVE_TX_DAT_NACK:
 	case LPC11U6X_I2C_SLAVE_TX_LAST_BYTE:
 		data->slave->callbacks->stop(data->slave);
 		set |= LPC11U6X_I2C_CONTROL_AA;
 		break;

 		/* Error cases */
 	case LPC11U6X_I2C_MASTER_TX_ADR_NACK:
 	case LPC11U6X_I2C_MASTER_RX_ADR_NACK:
 	case LPC11U6X_I2C_MASTER_TX_DAT_NACK:
 	case LPC11U6X_I2C_MASTER_TX_ARB_LOST:
 		transfer->status = LPC11U6X_I2C_STATUS_FAIL;
 		set = LPC11U6X_I2C_CONTROL_STOP;
 		break;

 	default:
 		set = LPC11U6X_I2C_CONTROL_STOP;
 		break;
 	}

 	i2c->con_clr = clear;
 	i2c->con_set = set;
 	if ((transfer->status != LPC11U6X_I2C_STATUS_BUSY) &&
 	    (transfer->status != LPC11U6X_I2C_STATUS_INACTIVE)) {
 		k_sem_give(&data->completion);
 	}
 }


 static int lpc11u6x_i2c_init(const struct device *dev)
 {
 	const struct lpc11u6x_i2c_config *cfg = dev->config;
 	struct lpc11u6x_i2c_data *data = dev->data;
 	const struct device *pinmux_dev, *clk_dev;

 	/* Configure SCL and SDA pins */
 	pinmux_dev = device_get_binding(cfg->scl_pinmux_drv);
 	if (!pinmux_dev) {
 		return -EINVAL;
 	}
 	pinmux_pin_set(pinmux_dev, cfg->scl_pin, cfg->scl_flags);

 	pinmux_dev = device_get_binding(cfg->sda_pinmux_drv);
 	if (!pinmux_dev) {
 		return -EINVAL;
 	}
 	pinmux_pin_set(pinmux_dev, cfg->sda_pin, cfg->sda_flags);

 	/* Configure clock and de-assert reset for I2Cx */
 	clk_dev = device_get_binding(cfg->clock_drv);
 	if (!clk_dev) {
 		return -EINVAL;
 	}
 	clock_control_on(clk_dev, (clock_control_subsys_t) cfg->clkid);

 	/* Configure bus speed. Default is 100KHz */
 	lpc11u6x_i2c_set_bus_speed(cfg, clk_dev, 100000);

 	/* Clear all control bytes and enable I2C interface */
 	cfg->base->con_clr = LPC11U6X_I2C_CONTROL_AA | LPC11U6X_I2C_CONTROL_SI |
 		LPC11U6X_I2C_CONTROL_START | LPC11U6X_I2C_CONTROL_I2C_EN;
 	cfg->base->con_set = LPC11U6X_I2C_CONTROL_I2C_EN;

 	/* Initialize mutex and semaphore */
 	k_mutex_init(&data->mutex);
 	k_sem_init(&data->completion, 0, 1);

 	data->transfer.status = LPC11U6X_I2C_STATUS_INACTIVE;
 	/* Configure IRQ */
 	cfg->irq_config_func(dev);
 	return 0;
 }

 static const struct i2c_driver_api i2c_api = {
 	.configure = lpc11u6x_i2c_configure,
 	.transfer = lpc11u6x_i2c_transfer,
 	.slave_register = lpc11u6x_i2c_slave_register,
 	.slave_unregister = lpc11u6x_i2c_slave_unregister,
 };

 #define LPC11U6X_I2C_INIT(idx)						      \
 									      \
 static void lpc11u6x_i2c_isr_config_##idx(const struct device *dev);	              \
 									      \
 static const struct lpc11u6x_i2c_config i2c_cfg_##idx = {		      \
 	.base =								      \
 	(struct lpc11u6x_i2c_regs *) DT_INST_REG_ADDR(idx),		      \
 	.clock_drv = DT_LABEL(DT_INST_PHANDLE(idx, clocks)),		      \
 	.scl_pinmux_drv =						      \
 	DT_LABEL(DT_INST_PHANDLE_BY_NAME(idx, pinmuxs, scl)),		      \
 	.sda_pinmux_drv =						      \
 	DT_LABEL(DT_INST_PHANDLE_BY_NAME(idx, pinmuxs, sda)),		      \
 	.irq_config_func = lpc11u6x_i2c_isr_config_##idx,		      \
 	.scl_flags =							      \
 	DT_INST_PHA_BY_NAME(idx, pinmuxs, scl, function),		      \
 	.sda_flags =							      \
 	DT_INST_PHA_BY_NAME(idx, pinmuxs, sda, function),		      \
 	.scl_pin = DT_INST_PHA_BY_NAME(idx, pinmuxs, scl, pin),		      \
 	.sda_pin = DT_INST_PHA_BY_NAME(idx, pinmuxs, sda, pin),		      \
 	.clkid = DT_INST_PHA_BY_IDX(idx, clocks, 0, clkid),		      \
 };									      \
 									      \
 static struct lpc11u6x_i2c_data i2c_data_##idx;			              \
 									      \
 I2C_DEVICE_DT_INST_DEFINE(idx,						      \
 		    lpc11u6x_i2c_init,					      \
 		    NULL,						      \
 		    &i2c_data_##idx, &i2c_cfg_##idx,			      \
 		    PRE_KERNEL_1, CONFIG_I2C_INIT_PRIORITY,		      \
 		    &i2c_api);						      \
 									      \
 static void lpc11u6x_i2c_isr_config_##idx(const struct device *dev)		      \
 {									      \
 	IRQ_CONNECT(DT_INST_IRQN(idx),					      \
 		    DT_INST_IRQ(idx, priority),				      \
 		    lpc11u6x_i2c_isr, DEVICE_DT_INST_GET(idx), 0);	      \
 									      \
 	irq_enable(DT_INST_IRQN(idx));					      \
 }

 DT_INST_FOREACH_STATUS_OKAY(LPC11U6X_I2C_INIT);
	/*
	* Copyright (c) 2020, Seagate Technology LLC
	*
	* SPDX-License-Identifier: Apache-2.0
	*/

	#define DT_DRV_COMPAT nxp_lpc11u6x_i2c

	#include <kernel.h>
	#include <drivers/i2c.h>
	#include <drivers/pinmux.h>
	#include <drivers/clock_control.h>
	#include <dt-bindings/pinctrl/lpc11u6x-pinctrl.h>
	#include "i2c_lpc11u6x.h"

	#define DEV_BASE(dev) (((struct lpc11u6x_i2c_config *)(dev->config))->base)

	static void lpc11u6x_i2c_set_bus_speed(const struct lpc11u6x_i2c_config *cfg,
	const struct device *clk_dev,
	uint32_t speed)
	{
	uint32_t clk, div;

	clock_control_get_rate(clk_dev, (clock_control_subsys_t) cfg->clkid,
	&clk);
	div = clk / speed;

	cfg->base->sclh = div / 2;
	cfg->base->scll = div - (div / 2);
	}

	static int lpc11u6x_i2c_configure(const struct device *dev,
	uint32_t dev_config)
	{
	const struct lpc11u6x_i2c_config *cfg = dev->config;
	struct lpc11u6x_i2c_data *data = dev->data;
	const struct device clk_dev, pinmux_dev;
	uint32_t speed, flags = 0;

	switch (I2C_SPEED_GET(dev_config)) {
	case I2C_SPEED_STANDARD:
	speed = 100000;
	break;
	case I2C_SPEED_FAST:
	speed = 400000;
	break;
	case I2C_SPEED_FAST_PLUS:
	flags \|= IOCON_FASTI2C_EN;
	speed = 1000000;
	break;
	case I2C_SPEED_HIGH:
	case I2C_SPEED_ULTRA:
	return -ENOTSUP;
	default:
	return -EINVAL;
	}

	if (dev_config & I2C_ADDR_10_BITS) {
	return -ENOTSUP;
	}

	clk_dev = device_get_binding(cfg->clock_drv);
	if (!clk_dev) {
	return -EINVAL;
	}

	k_mutex_lock(&data->mutex, K_FOREVER);
	lpc11u6x_i2c_set_bus_speed(cfg, clk_dev, speed);

	if (!flags) {
	goto exit;
	}

	pinmux_dev = device_get_binding(cfg->scl_pinmux_drv);
	if (!pinmux_dev) {
	goto err;
	}
	pinmux_pin_set(pinmux_dev, cfg->scl_pin, cfg->scl_flags \| flags);

	pinmux_dev = device_get_binding(cfg->sda_pinmux_drv);
	if (!pinmux_dev) {
	goto err;
	}
	pinmux_pin_set(pinmux_dev, cfg->sda_pin, cfg->sda_flags \| flags);

	exit:
	k_mutex_unlock(&data->mutex);
	return 0;
	err:
	k_mutex_unlock(&data->mutex);
	return -EINVAL;
	}

	static int lpc11u6x_i2c_transfer(const struct device *dev,
	struct i2c_msg *msgs,
	uint8_t num_msgs, uint16_t addr)
	{
	const struct lpc11u6x_i2c_config *cfg = dev->config;
	struct lpc11u6x_i2c_data *data = dev->data;
	int ret = 0;

	if (!num_msgs) {
	return 0;
	}

	k_mutex_lock(&data->mutex, K_FOREVER);

	data->transfer.msgs = msgs;
	data->transfer.curr_buf = msgs->buf;
	data->transfer.curr_len = msgs->len;
	data->transfer.nr_msgs = num_msgs;
	data->transfer.addr = addr;

	/* Reset all control bits */
	cfg->base->con_clr = LPC11U6X_I2C_CONTROL_SI \|
	LPC11U6X_I2C_CONTROL_STOP \| LPC11U6X_I2C_CONTROL_START;

	/* Send start and wait for completion */
	data->transfer.status = LPC11U6X_I2C_STATUS_BUSY;
	cfg->base->con_set = LPC11U6X_I2C_CONTROL_START;

	k_sem_take(&data->completion, K_FOREVER);

	if (data->transfer.status != LPC11U6X_I2C_STATUS_OK) {
	ret = -EIO;
	}
	data->transfer.status = LPC11U6X_I2C_STATUS_INACTIVE;

	/* If a slave is registered, put the controller in slave mode */
	if (data->slave) {
	cfg->base->con_set = LPC11U6X_I2C_CONTROL_AA;
	}

	k_mutex_unlock(&data->mutex);
	return ret;
	}

	static int lpc11u6x_i2c_slave_register(const struct device *dev,
	struct i2c_slave_config *cfg)
	{
	const struct lpc11u6x_i2c_config *dev_cfg = dev->config;
	struct lpc11u6x_i2c_data *data = dev->data;
	int ret = 0;

	if (!cfg) {
	return -EINVAL;
	}

	if (cfg->flags & I2C_SLAVE_FLAGS_ADDR_10_BITS) {
	return -ENOTSUP;
	}

	k_mutex_lock(&data->mutex, K_FOREVER);
	if (data->slave) {
	ret = -EBUSY;
	goto exit;
	}

	data->slave = cfg;
	/* Configure controller to act as slave */
	dev_cfg->base->addr0 = (cfg->address << 1);
	dev_cfg->base->con_clr = LPC11U6X_I2C_CONTROL_START \|
	LPC11U6X_I2C_CONTROL_STOP \| LPC11U6X_I2C_CONTROL_SI;
	dev_cfg->base->con_set = LPC11U6X_I2C_CONTROL_AA;

	exit:
	k_mutex_unlock(&data->mutex);
	return ret;
	}


	static int lpc11u6x_i2c_slave_unregister(const struct device *dev,
	struct i2c_slave_config *cfg)
	{
	const struct lpc11u6x_i2c_config *dev_cfg = dev->config;
	struct lpc11u6x_i2c_data *data = dev->data;

	if (!cfg) {
	return -EINVAL;
	}
	if (data->slave != cfg) {
	return -EINVAL;
	}

	k_mutex_lock(&data->mutex, K_FOREVER);
	data->slave = NULL;
	dev_cfg->base->con_clr = LPC11U6X_I2C_CONTROL_AA;
	k_mutex_unlock(&data->mutex);

	return 0;
	}

	static void lpc11u6x_i2c_isr(const struct device *dev)
	{
	struct lpc11u6x_i2c_data *data = dev->data;
	struct lpc11u6x_i2c_regs *i2c = DEV_BASE(dev);
	struct lpc11u6x_i2c_current_transfer *transfer = &data->transfer;
	uint32_t clear = LPC11U6X_I2C_CONTROL_SI;
	uint32_t set = 0;
	uint8_t val;

	switch (i2c->stat) {
	/* Master TX states */
	case LPC11U6X_I2C_MASTER_TX_START:
	case LPC11U6X_I2C_MASTER_TX_RESTART:
	i2c->dat = (transfer->addr << 1) \|
	(transfer->msgs->flags & I2C_MSG_READ);
	clear \|= LPC11U6X_I2C_CONTROL_START;
	transfer->curr_buf = transfer->msgs->buf;
	transfer->curr_len = transfer->msgs->len;
	break;

	case LPC11U6X_I2C_MASTER_TX_ADR_ACK:
	case LPC11U6X_I2C_MASTER_TX_DAT_ACK:
	if (!transfer->curr_len) {
	transfer->msgs++;
	transfer->nr_msgs--;
	if (!transfer->nr_msgs) {
	transfer->status = LPC11U6X_I2C_STATUS_OK;
	set \|= LPC11U6X_I2C_CONTROL_STOP;
	} else {
	set \|= LPC11U6X_I2C_CONTROL_START;
	}
	} else {
	i2c->dat = transfer->curr_buf[0];
	transfer->curr_buf++;
	transfer->curr_len--;
	}
	break;

	/* Master RX states */
	case LPC11U6X_I2C_MASTER_RX_DAT_NACK:
	transfer->msgs++;
	transfer->nr_msgs--;
	set \|= (transfer->nr_msgs ? LPC11U6X_I2C_CONTROL_START :
	LPC11U6X_I2C_CONTROL_STOP);
	if (!transfer->nr_msgs) {
	transfer->status = LPC11U6X_I2C_STATUS_OK;
	}
	__fallthrough;
	case LPC11U6X_I2C_MASTER_RX_DAT_ACK:
	transfer->curr_buf[0] = i2c->dat;
	transfer->curr_buf++;
	transfer->curr_len--;
	__fallthrough;
	case LPC11U6X_I2C_MASTER_RX_ADR_ACK:
	if (transfer->curr_len <= 1) {
	clear \|= LPC11U6X_I2C_CONTROL_AA;
	} else {
	set \|= LPC11U6X_I2C_CONTROL_AA;
	}
	break;

	/* Slave States */
	case LPC11U6X_I2C_SLAVE_RX_ADR_ACK:
	case LPC11U6X_I2C_SLAVE_RX_ARB_LOST_ADR_ACK:
	case LPC11U6X_I2C_SLAVE_RX_GC_ACK:
	case LPC11U6X_I2C_SLAVE_RX_ARB_LOST_GC_ACK:
	if (data->slave->callbacks->write_requested(data->slave)) {
	clear \|= LPC11U6X_I2C_CONTROL_AA;
	}
	break;

	case LPC11U6X_I2C_SLAVE_RX_DAT_ACK:
	case LPC11U6X_I2C_SLAVE_RX_GC_DAT_ACK:
	val = i2c->dat;
	if (data->slave->callbacks->write_received(data->slave, val)) {
	clear \|= LPC11U6X_I2C_CONTROL_AA;
	}
	break;

	case LPC11U6X_I2C_SLAVE_RX_DAT_NACK:
	case LPC11U6X_I2C_SLAVE_RX_GC_DAT_NACK:
	val = i2c->dat;
	data->slave->callbacks->write_received(data->slave, val);
	data->slave->callbacks->stop(data->slave);
	set \|= LPC11U6X_I2C_CONTROL_AA;
	break;

	case LPC11U6X_I2C_SLAVE_RX_STOP:
	data->slave->callbacks->stop(data->slave);
	set \|= LPC11U6X_I2C_CONTROL_AA;
	break;

	case LPC11U6X_I2C_SLAVE_TX_ADR_ACK:
	case LPC11U6X_I2C_SLAVE_TX_ARB_LOST_ADR_ACK:
	if (data->slave->callbacks->read_requested(data->slave, &val)) {
	clear \|= LPC11U6X_I2C_CONTROL_AA;
	}
	i2c->dat = val;
	break;
	case LPC11U6X_I2C_SLAVE_TX_DAT_ACK:
	if (data->slave->callbacks->read_processed(data->slave, &val)) {
	clear \|= LPC11U6X_I2C_CONTROL_AA;
	}
	i2c->dat = val;
	break;
	case LPC11U6X_I2C_SLAVE_TX_DAT_NACK:
	case LPC11U6X_I2C_SLAVE_TX_LAST_BYTE:
	data->slave->callbacks->stop(data->slave);
	set \|= LPC11U6X_I2C_CONTROL_AA;
	break;

	/* Error cases */
	case LPC11U6X_I2C_MASTER_TX_ADR_NACK:
	case LPC11U6X_I2C_MASTER_RX_ADR_NACK:
	case LPC11U6X_I2C_MASTER_TX_DAT_NACK:
	case LPC11U6X_I2C_MASTER_TX_ARB_LOST:
	transfer->status = LPC11U6X_I2C_STATUS_FAIL;
	set = LPC11U6X_I2C_CONTROL_STOP;
	break;

	default:
	set = LPC11U6X_I2C_CONTROL_STOP;
	break;
	}

	i2c->con_clr = clear;
	i2c->con_set = set;
	if ((transfer->status != LPC11U6X_I2C_STATUS_BUSY) &&
	(transfer->status != LPC11U6X_I2C_STATUS_INACTIVE)) {
	k_sem_give(&data->completion);
	}
	}


	static int lpc11u6x_i2c_init(const struct device *dev)
	{
	const struct lpc11u6x_i2c_config *cfg = dev->config;
	struct lpc11u6x_i2c_data *data = dev->data;
	const struct device pinmux_dev, clk_dev;

	/* Configure SCL and SDA pins */
	pinmux_dev = device_get_binding(cfg->scl_pinmux_drv);
	if (!pinmux_dev) {
	return -EINVAL;
	}
	pinmux_pin_set(pinmux_dev, cfg->scl_pin, cfg->scl_flags);

	pinmux_dev = device_get_binding(cfg->sda_pinmux_drv);
	if (!pinmux_dev) {
	return -EINVAL;
	}
	pinmux_pin_set(pinmux_dev, cfg->sda_pin, cfg->sda_flags);

	/* Configure clock and de-assert reset for I2Cx */
	clk_dev = device_get_binding(cfg->clock_drv);
	if (!clk_dev) {
	return -EINVAL;
	}
	clock_control_on(clk_dev, (clock_control_subsys_t) cfg->clkid);

	/* Configure bus speed. Default is 100KHz */
	lpc11u6x_i2c_set_bus_speed(cfg, clk_dev, 100000);

	/* Clear all control bytes and enable I2C interface */
	cfg->base->con_clr = LPC11U6X_I2C_CONTROL_AA \| LPC11U6X_I2C_CONTROL_SI \|
	LPC11U6X_I2C_CONTROL_START \| LPC11U6X_I2C_CONTROL_I2C_EN;
	cfg->base->con_set = LPC11U6X_I2C_CONTROL_I2C_EN;

	/* Initialize mutex and semaphore */
	k_mutex_init(&data->mutex);
	k_sem_init(&data->completion, 0, 1);

	data->transfer.status = LPC11U6X_I2C_STATUS_INACTIVE;
	/* Configure IRQ */
	cfg->irq_config_func(dev);
	return 0;
	}

	static const struct i2c_driver_api i2c_api = {
	.configure = lpc11u6x_i2c_configure,
	.transfer = lpc11u6x_i2c_transfer,
	.slave_register = lpc11u6x_i2c_slave_register,
	.slave_unregister = lpc11u6x_i2c_slave_unregister,
	};

	#define LPC11U6X_I2C_INIT(idx) \
	\
	static void lpc11u6x_i2c_isr_config_##idx(const struct device *dev); \
	\
	static const struct lpc11u6x_i2c_config i2c_cfg_##idx = { \
	.base = \
	(struct lpc11u6x_i2c_regs *) DT_INST_REG_ADDR(idx), \
	.clock_drv = DT_LABEL(DT_INST_PHANDLE(idx, clocks)), \
	.scl_pinmux_drv = \
	DT_LABEL(DT_INST_PHANDLE_BY_NAME(idx, pinmuxs, scl)), \
	.sda_pinmux_drv = \
	DT_LABEL(DT_INST_PHANDLE_BY_NAME(idx, pinmuxs, sda)), \
	.irq_config_func = lpc11u6x_i2c_isr_config_##idx, \
	.scl_flags = \
	DT_INST_PHA_BY_NAME(idx, pinmuxs, scl, function), \
	.sda_flags = \
	DT_INST_PHA_BY_NAME(idx, pinmuxs, sda, function), \
	.scl_pin = DT_INST_PHA_BY_NAME(idx, pinmuxs, scl, pin), \
	.sda_pin = DT_INST_PHA_BY_NAME(idx, pinmuxs, sda, pin), \
	.clkid = DT_INST_PHA_BY_IDX(idx, clocks, 0, clkid), \
	}; \
	\
	static struct lpc11u6x_i2c_data i2c_data_##idx; \
	\
	I2C_DEVICE_DT_INST_DEFINE(idx, \
	lpc11u6x_i2c_init, \
	NULL, \
	&i2c_data_##idx, &i2c_cfg_##idx, \
	PRE_KERNEL_1, CONFIG_I2C_INIT_PRIORITY, \
	&i2c_api); \
	\
	static void lpc11u6x_i2c_isr_config_##idx(const struct device *dev) \
	{ \
	IRQ_CONNECT(DT_INST_IRQN(idx), \
	DT_INST_IRQ(idx, priority), \
	lpc11u6x_i2c_isr, DEVICE_DT_INST_GET(idx), 0); \
	\
	irq_enable(DT_INST_IRQN(idx)); \
	}

	DT_INST_FOREACH_STATUS_OKAY(LPC11U6X_I2C_INIT);