SMBus Interface . More...

Data Structures
struct	smbus_callback
	SMBus callback structure. More...

struct	smbus_dt_spec
	Complete SMBus DT information. More...

Macros
#define	SMBUS_BLOCK_BYTES_MAX 32
	Maximum number of bytes in SMBus Block protocol.

#define	SMBUS_DT_SPEC_GET(node_id)
	Structure initializer for smbus_dt_spec from devicetree.

#define	SMBUS_DT_SPEC_INST_GET(inst)
	Structure initializer for smbus_dt_spec from devicetree instance.

#define	SMBUS_DEVICE_DT_DEFINE(node_id, init_fn, pm_device, data_ptr, cfg_ptr, level, prio, api_ptr, ...)
	Like DEVICE_DT_DEFINE() with SMBus specifics.

#define	SMBUS_DEVICE_DT_INST_DEFINE(inst, ...)
	Like SMBUS_DEVICE_DT_DEFINE() for an instance of a DT_DRV_COMPAT compatible.

Typedefs
typedef void(*	smbus_callback_handler_t) (const struct device dev, struct smbus_callback cb, uint8_t addr)
	Define SMBus callback handler function signature.

Functions
static void	smbus_xfer_stats (const struct device *dev, uint8_t sent, uint8_t recv)
	Updates the SMBus stats.

int	smbus_configure (const struct device *dev, uint32_t dev_config)
	Configure operation of a SMBus host controller.

int	smbus_get_config (const struct device dev, uint32_t dev_config)
	Get configuration of a SMBus host controller.

static int	smbus_smbalert_set_cb (const struct device dev, struct smbus_callback cb)
	Add SMBUSALERT callback for a SMBus host controller.

int	smbus_smbalert_remove_cb (const struct device dev, struct smbus_callback cb)
	Remove SMBUSALERT callback from a SMBus host controller.

static int	smbus_host_notify_set_cb (const struct device dev, struct smbus_callback cb)
	Add Host Notify callback for a SMBus host controller.

int	smbus_host_notify_remove_cb (const struct device dev, struct smbus_callback cb)
	Remove Host Notify callback from a SMBus host controller.

int	smbus_quick (const struct device *dev, uint16_t addr, enum smbus_direction direction)
	Perform SMBus Quick operation.

int	smbus_byte_write (const struct device *dev, uint16_t addr, uint8_t byte)
	Perform SMBus Byte Write operation.

int	smbus_byte_read (const struct device dev, uint16_t addr, uint8_t byte)
	Perform SMBus Byte Read operation.

int	smbus_byte_data_write (const struct device *dev, uint16_t addr, uint8_t cmd, uint8_t byte)
	Perform SMBus Byte Data Write operation.

int	smbus_byte_data_read (const struct device dev, uint16_t addr, uint8_t cmd, uint8_t byte)
	Perform SMBus Byte Data Read operation.

int	smbus_word_data_write (const struct device *dev, uint16_t addr, uint8_t cmd, uint16_t word)
	Perform SMBus Word Data Write operation.

int	smbus_word_data_read (const struct device dev, uint16_t addr, uint8_t cmd, uint16_t word)
	Perform SMBus Word Data Read operation.

int	smbus_pcall (const struct device dev, uint16_t addr, uint8_t cmd, uint16_t send_word, uint16_t recv_word)
	Perform SMBus Process Call operation.

int	smbus_block_write (const struct device dev, uint16_t addr, uint8_t cmd, uint8_t count, uint8_t buf)
	Perform SMBus Block Write operation.

int	smbus_block_read (const struct device dev, uint16_t addr, uint8_t cmd, uint8_t count, uint8_t *buf)
	Perform SMBus Block Read operation.

int	smbus_block_pcall (const struct device dev, uint16_t addr, uint8_t cmd, uint8_t snd_count, uint8_t snd_buf, uint8_t rcv_count, uint8_t rcv_buf)
	Perform SMBus Block Process Call operation.

SMBus read / write direction
enum	smbus_direction { SMBUS_MSG_WRITE = 0 , SMBUS_MSG_READ = 1 }
	SMBus read / write direction. More...

SMBus Protocol commands
SMBus Specification defines the following SMBus protocols operations
#define	SMBUS_CMD_QUICK 0b000
	SMBus Quick protocol is a very simple command with no data sent or received.

#define	SMBUS_CMD_BYTE 0b001
	SMBus Byte protocol can send or receive one byte of data.

#define	SMBUS_CMD_BYTE_DATA 0b010
	SMBus Byte Data protocol sends the first byte (command) followed by read or write one byte.

#define	SMBUS_CMD_WORD_DATA 0b011
	SMBus Word Data protocol sends the first byte (command) followed by read or write two bytes.

#define	SMBUS_CMD_PROC_CALL 0b100
	SMBus Process Call protocol is Write Word followed by Read Word.

#define	SMBUS_CMD_BLOCK 0b101
	SMBus Block protocol reads or writes a block of data up to 32 bytes.

#define	SMBUS_CMD_BLOCK_PROC 0b111
	SMBus Block Write - Block Read Process Call protocol is Block Write followed by Block Read.

SMBus device functionality
The following parameters describe the functionality of the SMBus device
#define	SMBUS_MODE_CONTROLLER BIT(0)
	Peripheral to act as Controller.

#define	SMBUS_MODE_PEC BIT(1)
	Support Packet Error Code (PEC) checking.

#define	SMBUS_MODE_HOST_NOTIFY BIT(2)
	Support Host Notify functionality.

#define	SMBUS_MODE_SMBALERT BIT(3)
	Support SMBALERT signal functionality.

SMBus special reserved addresses
The following addresses are reserved by SMBus specification
#define	SMBUS_ADDRESS_ARA 0x0c
	Alert Response Address (ARA)

Detailed Description

SMBus Interface .

Since: 3.4

Version: 0.1.0

Macro Definition Documentation

◆ SMBUS_ADDRESS_ARA

#define SMBUS_ADDRESS_ARA 0x0c

#include <zephyr/drivers/smbus.h>

Alert Response Address (ARA)

A broadcast address used by the system host as part of the Alert Response Protocol.

◆ SMBUS_BLOCK_BYTES_MAX

#define SMBUS_BLOCK_BYTES_MAX 32

#include <zephyr/drivers/smbus.h>

Maximum number of bytes in SMBus Block protocol.

◆ SMBUS_CMD_BLOCK

#define SMBUS_CMD_BLOCK 0b101

#include <zephyr/drivers/smbus.h>

SMBus Block protocol reads or writes a block of data up to 32 bytes.

The Count byte specifies the amount of data.

SMBus Block Write
 
0                   1                   2
0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
|S| Periph Addr |W|A|  Command code |A| Send Count=N  |A|
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
|  Data Write 1 |A|      ...      |A|  Data Write N |A|P|
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
 
SMBus Block Read
 
0                   1                   2
0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
|S| Periph Addr |W|A|  Command code |A|S| Periph Addr |R|
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
|A|  Recv Count=N |A|  Data Read 1  |A|      ...      |A|
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
|  Data Read N  |N|P|
+-+-+-+-+-+-+-+-+-+-+

◆ SMBUS_CMD_BLOCK_PROC

#define SMBUS_CMD_BLOCK_PROC 0b111

#include <zephyr/drivers/smbus.h>

SMBus Block Write - Block Read Process Call protocol is Block Write followed by Block Read.

0                   1                   2
0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
|S| Periph Addr |W|A|  Command code |A|   Count = N   |A|
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
|  Data Write 1 |A|      ...      |A|  Data Write N |A|S|
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| Periph Addr |R|A|  Recv Count=N |A|  Data Read 1  |A| |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
|     ...     |A|  Data Read N  |N|P|
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+

◆ SMBUS_CMD_BYTE

#define SMBUS_CMD_BYTE 0b001

#include <zephyr/drivers/smbus.h>

SMBus Byte protocol can send or receive one byte of data.

Byte Write
 
0                   1                   2
0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
|S| Periph Addr |W|A| Command code  |A|P|
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
 
Byte Read
 
0                   1                   2
0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
|S| Periph Addr |R|A| Byte received |N|P|
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+

◆ SMBUS_CMD_BYTE_DATA

#define SMBUS_CMD_BYTE_DATA 0b010

#include <zephyr/drivers/smbus.h>

SMBus Byte Data protocol sends the first byte (command) followed by read or write one byte.

Byte Data Write
 
0                   1                   2
0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
|S| Periph Addr |W|A|  Command code |A|   Data Write  |A|P|
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
 
Byte Data Read
 
0                   1                   2
0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
|S| Periph Addr |W|A|  Command code |A|S| Periph Addr |R|A|
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
|   Data Read   |N|P|
+-+-+-+-+-+-+-+-+-+-+

◆ SMBUS_CMD_PROC_CALL

#define SMBUS_CMD_PROC_CALL 0b100

#include <zephyr/drivers/smbus.h>

SMBus Process Call protocol is Write Word followed by Read Word.

It is named so because the command sends data and waits for the peripheral to return a reply.

0                   1                   2
0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
|S| Periph Addr |W|A|  Command code |A| Data Write Low|A|
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| Data Write Hi |A|S| Periph Addr |R|A| Data Read Low |A|
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| Data Read Hi  |N|P|
+-+-+-+-+-+-+-+-+-+-+

◆ SMBUS_CMD_QUICK

#define SMBUS_CMD_QUICK 0b000

#include <zephyr/drivers/smbus.h>

SMBus Quick protocol is a very simple command with no data sent or received.

Peripheral may denote only R/W bit, which can still be used for the peripheral management, for example to switch peripheral On/Off. Quick protocol can also be used for peripheral devices scanning.

0                   1
0 1 2 3 4 5 6 7 8 9 0
+-+-+-+-+-+-+-+-+-+-+-+
|S| Periph Addr |D|A|P|
+-+-+-+-+-+-+-+-+-+-+-+

◆ SMBUS_CMD_WORD_DATA

#define SMBUS_CMD_WORD_DATA 0b011

#include <zephyr/drivers/smbus.h>

SMBus Word Data protocol sends the first byte (command) followed by read or write two bytes.

Word Data Write
 
0                   1                   2
0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
|S| Periph Addr |W|A|  Command code |A| Data Write Low|A|
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| Data Write Hi |A|P|
+-+-+-+-+-+-+-+-+-+-+
 
Word Data Read
 
0                   1                   2
0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
|S| Periph Addr |W|A|  Command code |A|S| Periph Addr |R|
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
|A| Data Read Low |A|  Data Read Hi |N|P|
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+

◆ SMBUS_DEVICE_DT_DEFINE

#define SMBUS_DEVICE_DT_DEFINE	(	node_id,
		init_fn,
		pm_device,
		data_ptr,
		cfg_ptr,
		level,
		prio,
		api_ptr,
		... )

#include <zephyr/drivers/smbus.h>

Value:

        Z_SMBUS_DEVICE_STATE_DEFINE(node_id,                            \
                                    Z_DEVICE_DT_DEV_NAME(node_id));     \
        Z_SMBUS_INIT_FN(Z_DEVICE_DT_DEV_NAME(node_id), init_fn)         \
        Z_DEVICE_DEFINE(node_id, Z_DEVICE_DT_DEV_NAME(node_id),         \
                        DEVICE_DT_NAME(node_id),                        \
                        &UTIL_CAT(Z_DEVICE_DT_DEV_NAME(node_id), _init),\
                        pm_device,                                      \
                        data_ptr, cfg_ptr, level, prio,                 \
                        api_ptr,                                        \
                        &(Z_DEVICE_STATE_NAME(Z_DEVICE_DT_DEV_NAME      \
                                              (node_id)).devstate),     \
                        __VA_ARGS__)

Like DEVICE_DT_DEFINE() with SMBus specifics.

Defines a device which implements the SMBus API. May generate a custom device_state container struct and init_fn wrapper when needed depending on SMBus

CONFIG_SMBUS_STATS

.

Parameters

node_id	The devicetree node identifier.
init_fn	Name of the init function of the driver.
pm_device	PM device resources reference (NULL if device does not use PM).
data_ptr	Pointer to the device's private data.
cfg_ptr	The address to the structure containing the configuration information for this instance of the driver.
level	The initialization level. See SYS_INIT() for details.
prio	Priority within the selected initialization level. See SYS_INIT() for details.
api_ptr	Provides an initial pointer to the API function struct used by the driver. Can be NULL.

◆ SMBUS_DEVICE_DT_INST_DEFINE

#define SMBUS_DEVICE_DT_INST_DEFINE	(		inst,
			... )

#include <zephyr/drivers/smbus.h>

Value:

SMBUS_DEVICE_DT_DEFINE(DT_DRV_INST(inst), __VA_ARGS__)

DT_DRV_INST

#define DT_DRV_INST(inst)

Node identifier for an instance of a DT_DRV_COMPAT compatible.

Definition devicetree.h:3802

SMBUS_DEVICE_DT_DEFINE

#define SMBUS_DEVICE_DT_DEFINE(node_id, init_fn, pm_device, data_ptr, cfg_ptr, level, prio, api_ptr,...)

Like DEVICE_DT_DEFINE() with SMBus specifics.

Definition smbus.h:504

Like SMBUS_DEVICE_DT_DEFINE() for an instance of a DT_DRV_COMPAT compatible.

Parameters

inst	instance number. This is replaced by `DT_DRV_COMPAT(inst)` in the call to SMBUS_DEVICE_DT_DEFINE().
...	other parameters as expected by SMBUS_DEVICE_DT_DEFINE().

◆ SMBUS_DT_SPEC_GET

#define SMBUS_DT_SPEC_GET ( node_id )

#include <zephyr/drivers/smbus.h>

Value:

        {                                                       \
                .bus = DEVICE_DT_GET(DT_BUS(node_id)),          \
                .addr = DT_REG_ADDR(node_id)                    \
        }

Structure initializer for smbus_dt_spec from devicetree.

This helper macro expands to a static initializer for a struct smbus_dt_spec by reading the relevant bus and address data from the devicetree.

Parameters

node_id Devicetree node identifier for the SMBus device whose struct smbus_dt_spec to create an initializer for

◆ SMBUS_DT_SPEC_INST_GET

#define SMBUS_DT_SPEC_INST_GET ( inst )

#include <zephyr/drivers/smbus.h>

Value:

SMBUS_DT_SPEC_GET(DT_DRV_INST(inst))

SMBUS_DT_SPEC_GET

#define SMBUS_DT_SPEC_GET(node_id)

Structure initializer for smbus_dt_spec from devicetree.

Definition smbus.h:318

Structure initializer for smbus_dt_spec from devicetree instance.

This is equivalent to SMBUS_DT_SPEC_GET(DT_DRV_INST(inst)).

Parameters

inst	Devicetree instance number

◆ SMBUS_MODE_CONTROLLER

#define SMBUS_MODE_CONTROLLER BIT(0)

#include <zephyr/drivers/smbus.h>

Peripheral to act as Controller.

◆ SMBUS_MODE_HOST_NOTIFY

#define SMBUS_MODE_HOST_NOTIFY BIT(2)

#include <zephyr/drivers/smbus.h>

Support Host Notify functionality.

◆ SMBUS_MODE_PEC

#define SMBUS_MODE_PEC BIT(1)

#include <zephyr/drivers/smbus.h>

Support Packet Error Code (PEC) checking.

◆ SMBUS_MODE_SMBALERT

#define SMBUS_MODE_SMBALERT BIT(3)

#include <zephyr/drivers/smbus.h>

Support SMBALERT signal functionality.

Typedef Documentation

◆ smbus_callback_handler_t

typedef void(* smbus_callback_handler_t) (const struct device *dev, struct smbus_callback *cb, uint8_t addr)

#include <zephyr/drivers/smbus.h>

Define SMBus callback handler function signature.

Parameters

dev	Pointer to the device structure for the SMBus driver instance.
cb	Structure smbus_callback owning this handler.
addr	Address of the SMBus peripheral device.

Enumeration Type Documentation

◆ smbus_direction

enum smbus_direction

#include <zephyr/drivers/smbus.h>

SMBus read / write direction.

Enumerator
SMBUS_MSG_WRITE	Write a message to SMBus peripheral.
SMBUS_MSG_READ	Read a message from SMBus peripheral.

Function Documentation

◆ smbus_block_pcall()

int smbus_block_pcall	(	const struct device *	dev,
		uint16_t	addr,
		uint8_t	cmd,
		uint8_t	snd_count,
		uint8_t *	snd_buf,
		uint8_t *	rcv_count,
		uint8_t *	rcv_buf )

#include <zephyr/drivers/smbus.h>

Perform SMBus Block Process Call operation.

This routine provides a generic interface to perform SMBus Block Process Call operation. This operation is basically Block Write followed by Block Read.

Parameters

dev	Pointer to the device structure for the SMBus driver instance.
addr	Address of the SMBus peripheral device.
cmd	Command byte which is sent to peripheral device first.
snd_count	Size of the data block buffer to send.
snd_buf	Data block buffer send to the peripheral device.
rcv_count	Size of the data peripheral sent.
rcv_buf	Data block buffer received from the peripheral device.

Return values

0	If successful.
-EIO	General input / output error.
-ENOSYS	If function smbus_block_pcall() is not implemented by the driver.

◆ smbus_block_read()

int smbus_block_read	(	const struct device *	dev,
		uint16_t	addr,
		uint8_t	cmd,
		uint8_t *	count,
		uint8_t *	buf )

#include <zephyr/drivers/smbus.h>

Perform SMBus Block Read operation.

This routine provides a generic interface to perform SMBus Block Read operation.

Parameters

dev	Pointer to the device structure for the SMBus driver instance.
addr	Address of the SMBus peripheral device.
cmd	Command byte which is sent to peripheral device first.
count	Size of the data peripheral sent. Maximum 32 bytes.
buf	Data block buffer received from the peripheral device.

Return values

0	If successful.
-EIO	General input / output error.
-ENOSYS	If function smbus_block_read() is not implemented by the driver.

◆ smbus_block_write()

int smbus_block_write	(	const struct device *	dev,
		uint16_t	addr,
		uint8_t	cmd,
		uint8_t	count,
		uint8_t *	buf )

#include <zephyr/drivers/smbus.h>

Perform SMBus Block Write operation.

This routine provides a generic interface to perform SMBus Block Write operation.

Parameters

dev	Pointer to the device structure for the SMBus driver instance.
addr	Address of the SMBus peripheral device.
cmd	Command byte which is sent to peripheral device first.
count	Size of the data block buffer. Maximum 32 bytes.
buf	Data block buffer to be sent to the peripheral device.

Return values

0	If successful.
-EIO	General input / output error.
-ENOSYS	If function smbus_block_write() is not implemented by the driver.

◆ smbus_byte_data_read()

int smbus_byte_data_read	(	const struct device *	dev,
		uint16_t	addr,
		uint8_t	cmd,
		uint8_t *	byte )

#include <zephyr/drivers/smbus.h>

Perform SMBus Byte Data Read operation.

This routine provides a generic interface to perform SMBus Byte Data Read operation.

Parameters

dev	Pointer to the device structure for the SMBus driver instance.
addr	Address of the SMBus peripheral device.
cmd	Command byte which is sent to peripheral device first.
byte	Byte received from the peripheral device.

Return values

0	If successful.
-EIO	General input / output error.
-ENOSYS	If function smbus_byte_data_read() is not implemented by the driver.

◆ smbus_byte_data_write()

int smbus_byte_data_write	(	const struct device *	dev,
		uint16_t	addr,
		uint8_t	cmd,
		uint8_t	byte )

#include <zephyr/drivers/smbus.h>

Perform SMBus Byte Data Write operation.

This routine provides a generic interface to perform SMBus Byte Data Write operation.

Parameters

dev	Pointer to the device structure for the SMBus driver instance.
addr	Address of the SMBus peripheral device.
cmd	Command byte which is sent to peripheral device first.
byte	Byte to be sent to the peripheral device.

Return values

0	If successful.
-EIO	General input / output error.
-ENOSYS	If function smbus_byte_data_write() is not implemented by the driver.

◆ smbus_byte_read()

int smbus_byte_read	(	const struct device *	dev,
		uint16_t	addr,
		uint8_t *	byte )

#include <zephyr/drivers/smbus.h>

Perform SMBus Byte Read operation.

This routine provides a generic interface to perform SMBus Byte Read operation.

Parameters

dev	Pointer to the device structure for the SMBus driver instance.
addr	Address of the SMBus peripheral device.
byte	Byte received from the peripheral device.

Return values

0	If successful.
-EIO	General input / output error.
-ENOSYS	If function smbus_byte_read() is not implemented by the driver.

◆ smbus_byte_write()

int smbus_byte_write	(	const struct device *	dev,
		uint16_t	addr,
		uint8_t	byte )

#include <zephyr/drivers/smbus.h>

Perform SMBus Byte Write operation.

This routine provides a generic interface to perform SMBus Byte Write operation.

Parameters

dev	Pointer to the device structure for the SMBus driver instance.
addr	Address of the SMBus peripheral device.
byte	Byte to be sent to the peripheral device.

Return values

0	If successful.
-EIO	General input / output error.
-ENOSYS	If function smbus_byte_write() is not implemented by the driver.

◆ smbus_configure()

int smbus_configure	(	const struct device *	dev,
		uint32_t	dev_config )

#include <zephyr/drivers/smbus.h>

Configure operation of a SMBus host controller.

Parameters

dev	Pointer to the device structure for the SMBus driver instance.
dev_config	Bit-packed 32-bit value to the device runtime configuration for the SMBus controller.

Return values

0	If successful.
-EIO	General input / output error.

◆ smbus_get_config()

int smbus_get_config	(	const struct device *	dev,
		uint32_t *	dev_config )

#include <zephyr/drivers/smbus.h>

Get configuration of a SMBus host controller.

This routine provides a way to get current configuration. It is allowed to call the function before smbus_configure, because some SMBus ports can be configured during init process. However, if the SMBus port is not configured, smbus_get_config returns an error.

smbus_get_config can return cached config or probe hardware, but it has to be up to date with current configuration.

Parameters

dev	Pointer to the device structure for the SMBus driver instance.
dev_config	Pointer to return bit-packed 32-bit value of the SMBus controller configuration.

Return values

0	If successful.
-EIO	General input / output error.
-ENOSYS	If function smbus_get_config() is not implemented by the driver.

◆ smbus_host_notify_remove_cb()

int smbus_host_notify_remove_cb	(	const struct device *	dev,
		struct smbus_callback *	cb )

#include <zephyr/drivers/smbus.h>

Remove Host Notify callback from a SMBus host controller.

Parameters

dev	Pointer to the device structure for the SMBus driver instance.
cb	Pointer to a callback structure.

Return values

0	If successful.
-EIO	General input / output error.
-ENOSYS	If function smbus_host_notify_remove_cb() is not implemented by the driver.

◆ smbus_host_notify_set_cb()

static int smbus_host_notify_set_cb	(	const struct device *	dev,
		struct smbus_callback *	cb )

inlinestatic

#include <zephyr/drivers/smbus.h>

Add Host Notify callback for a SMBus host controller.

Parameters

dev	Pointer to the device structure for the SMBus driver instance.
cb	Pointer to a callback structure.

Return values

0	If successful.
-EIO	General input / output error.
-ENOSYS	If function smbus_host_notify_set_cb() is not implemented by the driver.

◆ smbus_pcall()

int smbus_pcall	(	const struct device *	dev,
		uint16_t	addr,
		uint8_t	cmd,
		uint16_t	send_word,
		uint16_t *	recv_word )

#include <zephyr/drivers/smbus.h>

Perform SMBus Process Call operation.

This routine provides a generic interface to perform SMBus Process Call operation, which means Write 2 bytes following by Read 2 bytes.

Parameters

dev	Pointer to the device structure for the SMBus driver instance.
addr	Address of the SMBus peripheral device.
cmd	Command byte which is sent to peripheral device first.
send_word	Word (16-bit) to be sent to the peripheral device.
recv_word	Word (16-bit) received from the peripheral device.

Return values

0	If successful.
-EIO	General input / output error.
-ENOSYS	If function smbus_pcall() is not implemented by the driver.

◆ smbus_quick()

int smbus_quick	(	const struct device *	dev,
		uint16_t	addr,
		enum smbus_direction	direction )

#include <zephyr/drivers/smbus.h>

Perform SMBus Quick operation.

This routine provides a generic interface to perform SMBus Quick operation.

Parameters

dev	Pointer to the device structure for the SMBus driver instance. driver configured in controller mode.
addr	Address of the SMBus peripheral device.
direction	Direction Read or Write.

Return values

0	If successful.
-EIO	General input / output error.
-ENOSYS	If function smbus_quick() is not implemented by the driver.

◆ smbus_smbalert_remove_cb()

int smbus_smbalert_remove_cb	(	const struct device *	dev,
		struct smbus_callback *	cb )

#include <zephyr/drivers/smbus.h>

Remove SMBUSALERT callback from a SMBus host controller.

Parameters

dev	Pointer to the device structure for the SMBus driver instance.
cb	Pointer to a callback structure.

Return values

0	If successful.
-EIO	General input / output error.
-ENOSYS	If function smbus_smbalert_remove_cb() is not implemented by the driver.

◆ smbus_smbalert_set_cb()

static int smbus_smbalert_set_cb	(	const struct device *	dev,
		struct smbus_callback *	cb )

inlinestatic

#include <zephyr/drivers/smbus.h>

Add SMBUSALERT callback for a SMBus host controller.

Parameters

dev	Pointer to the device structure for the SMBus driver instance.
cb	Pointer to a callback structure.

Return values

0	If successful.
-EIO	General input / output error.
-ENOSYS	If function smbus_smbalert_set_cb() is not implemented by the driver.

◆ smbus_word_data_read()

int smbus_word_data_read	(	const struct device *	dev,
		uint16_t	addr,
		uint8_t	cmd,
		uint16_t *	word )

#include <zephyr/drivers/smbus.h>

Perform SMBus Word Data Read operation.

This routine provides a generic interface to perform SMBus Word Data Read operation.

Parameters

dev	Pointer to the device structure for the SMBus driver instance.
addr	Address of the SMBus peripheral device.
cmd	Command byte which is sent to peripheral device first.
word	Word (16-bit) received from the peripheral device.

Return values

0	If successful.
-EIO	General input / output error.
-ENOSYS	If function smbus_word_data_read() is not implemented by the driver.

◆ smbus_word_data_write()

int smbus_word_data_write	(	const struct device *	dev,
		uint16_t	addr,
		uint8_t	cmd,
		uint16_t	word )

#include <zephyr/drivers/smbus.h>

Perform SMBus Word Data Write operation.

This routine provides a generic interface to perform SMBus Word Data Write operation.

Parameters

dev	Pointer to the device structure for the SMBus driver instance.
addr	Address of the SMBus peripheral device.
cmd	Command byte which is sent to peripheral device first.
word	Word (16-bit) to be sent to the peripheral device.

Return values

0	If successful.
-EIO	General input / output error.
-ENOSYS	If function smbus_word_data_write() is not implemented by the driver.

◆ smbus_xfer_stats()

static void smbus_xfer_stats	(	const struct device *	dev,
		uint8_t	sent,
		uint8_t	recv )

inlinestatic

#include <zephyr/drivers/smbus.h>

Updates the SMBus stats.

Parameters

dev	Pointer to the device structure for the SMBus driver instance to update stats for.
sent	Number of bytes sent
recv	Number of bytes received

Data Structures

Macros

Typedefs

Functions

SMBus read / write direction

SMBus Protocol commands

SMBus device functionality

SMBus special reserved addresses

Detailed Description

Macro Definition Documentation

◆ SMBUS_ADDRESS_ARA

◆ SMBUS_BLOCK_BYTES_MAX

◆ SMBUS_CMD_BLOCK

◆ SMBUS_CMD_BLOCK_PROC

◆ SMBUS_CMD_BYTE

◆ SMBUS_CMD_BYTE_DATA

◆ SMBUS_CMD_PROC_CALL

◆ SMBUS_CMD_QUICK

◆ SMBUS_CMD_WORD_DATA

◆ SMBUS_DEVICE_DT_DEFINE

◆ SMBUS_DEVICE_DT_INST_DEFINE

◆ SMBUS_DT_SPEC_GET

◆ SMBUS_DT_SPEC_INST_GET

◆ SMBUS_MODE_CONTROLLER

◆ SMBUS_MODE_HOST_NOTIFY

◆ SMBUS_MODE_PEC

◆ SMBUS_MODE_SMBALERT

Typedef Documentation

◆ smbus_callback_handler_t

Enumeration Type Documentation

◆ smbus_direction

Function Documentation

◆ smbus_block_pcall()

◆ smbus_block_read()

◆ smbus_block_write()

◆ smbus_byte_data_read()

◆ smbus_byte_data_write()

◆ smbus_byte_read()

◆ smbus_byte_write()

◆ smbus_configure()

◆ smbus_get_config()

◆ smbus_host_notify_remove_cb()

◆ smbus_host_notify_set_cb()

◆ smbus_pcall()

◆ smbus_quick()

◆ smbus_smbalert_remove_cb()

◆ smbus_smbalert_set_cb()

◆ smbus_word_data_read()

◆ smbus_word_data_write()

◆ smbus_xfer_stats()