/* SPDX-License-Identifier: GPL-2.0 */
/*
* Copyright ( C ) 2018 Cadence Design Systems Inc .
*
* Author : Boris Brezillon < boris . brezillon @ bootlin . com >
*/
#ifndef I3C_MASTER_H
#define I3C_MASTER_H
#include <asm /bitsperlong.h>
#include <linux/bitops.h>
#include <linux/i2c.h>
#include <linux/i3c/ccc.h>
#include <linux/i3c/device.h>
#include <linux/rwsem.h>
#include <linux/spinlock.h>
#include <linux/workqueue.h>
#define I3C_HOT_JOIN_ADDR 0 x2
#define I3C_BROADCAST_ADDR 0 x7e
#define I3C_MAX_ADDR GENMASK(6 , 0 )
struct i2c_client;
/* notifier actions. notifier call data is the struct i3c_bus */
enum {
I3C_NOTIFY_BUS_ADD,
I3C_NOTIFY_BUS_REMOVE,
};
struct i3c_master_controller;
struct i3c_bus;
struct i3c_device;
extern const struct bus_type i3c_bus_type;
/**
* struct i3c_i2c_dev_desc - Common part of the I3C / I2C device descriptor
* @ node : node element used to insert the slot into the I2C or I3C device
* list
* @ master : I3C master that instantiated this device . Will be used to do
* I2C / I3C transfers
* @ master_priv : master private data assigned to the device . Can be used to
* add master specific information
*
* This structure is describing common I3C / I2C dev information .
*/
struct i3c_i2c_dev_desc {
struct list_head node;
struct i3c_master_controller *master;
void *master_priv;
};
#define I3C_LVR_I2C_INDEX_MASK GENMASK(7 , 5 )
#define I3C_LVR_I2C_INDEX(x) ((x) << 5 )
#define I3C_LVR_I2C_FM_MODE BIT(4 )
#define I2C_MAX_ADDR GENMASK(6 , 0 )
/**
* struct i2c_dev_boardinfo - I2C device board information
* @ node : used to insert the boardinfo object in the I2C boardinfo list
* @ base : regular I2C board information
* @ lvr : LVR ( Legacy Virtual Register ) needed by the I3C core to know about
* the I2C device limitations
*
* This structure is used to attach board - level information to an I2C device .
* Each I2C device connected on the I3C bus should have one .
*/
struct i2c_dev_boardinfo {
struct list_head node;
struct i2c_board_info base;
u8 lvr;
};
/**
* struct i2c_dev_desc - I2C device descriptor
* @ common : common part of the I2C device descriptor
* @ dev : I2C device object registered to the I2C framework
* @ addr : I2C device address
* @ lvr : LVR ( Legacy Virtual Register ) needed by the I3C core to know about
* the I2C device limitations
*
* Each I2C device connected on the bus will have an i2c_dev_desc .
* This object is created by the core and later attached to the controller
* using & struct_i3c_master_controller - > ops - > attach_i2c_dev ( ) .
*
* & struct_i2c_dev_desc is the internal representation of an I2C device
* connected on an I3C bus . This object is also passed to all
* & struct_i3c_master_controller_ops hooks .
*/
struct i2c_dev_desc {
struct i3c_i2c_dev_desc common;
struct i2c_client *dev;
u16 addr;
u8 lvr;
};
/**
* struct i3c_ibi_slot - I3C IBI ( In - Band Interrupt ) slot
* @ work : work associated to this slot . The IBI handler will be called from
* there
* @ dev : the I3C device that has generated this IBI
* @ len : length of the payload associated to this IBI
* @ data : payload buffer
*
* An IBI slot is an object pre - allocated by the controller and used when an
* IBI comes in .
* Every time an IBI comes in , the I3C master driver should find a free IBI
* slot in its IBI slot pool , retrieve the IBI payload and queue the IBI using
* i3c_master_queue_ibi ( ) .
*
* How IBI slots are allocated is left to the I3C master driver , though , for
* simple kmalloc - based allocation , the generic IBI slot pool can be used .
*/
struct i3c_ibi_slot {
struct work_struct work;
struct i3c_dev_desc *dev;
unsigned int len;
void *data;
};
/**
* struct i3c_device_ibi_info - IBI information attached to a specific device
* @ all_ibis_handled : used to be informed when no more IBIs are waiting to be
* processed . Used by i3c_device_disable_ibi ( ) to wait for
* all IBIs to be dequeued
* @ pending_ibis : count the number of pending IBIs . Each pending IBI has its
* work element queued to the controller workqueue
* @ max_payload_len : maximum payload length for an IBI coming from this device .
* this value is specified when calling
* i3c_device_request_ibi ( ) and should not change at run
* time . All messages IBIs exceeding this limit should be
* rejected by the master
* @ num_slots : number of IBI slots reserved for this device
* @ enabled : reflect the IBI status
* @ wq : workqueue used to execute IBI handlers .
* @ handler : IBI handler specified at i3c_device_request_ibi ( ) call time . This
* handler will be called from the controller workqueue , and as such
* is allowed to sleep ( though it is recommended to process the IBI
* as fast as possible to not stall processing of other IBIs queued
* on the same workqueue ) .
* New I3C messages can be sent from the IBI handler
*
* The & struct_i3c_device_ibi_info object is allocated when
* i3c_device_request_ibi ( ) is called and attached to a specific device . This
* object is here to manage IBIs coming from a specific I3C device .
*
* Note that this structure is the generic view of the IBI management
* infrastructure . I3C master drivers may have their own internal
* representation which they can associate to the device using
* controller - private data .
*/
struct i3c_device_ibi_info {
struct completion all_ibis_handled;
atomic_t pending_ibis;
unsigned int max_payload_len;
unsigned int num_slots;
unsigned int enabled;
struct workqueue_struct *wq;
void (*handler)(struct i3c_device *dev,
const struct i3c_ibi_payload *payload);
};
/**
* struct i3c_dev_boardinfo - I3C device board information
* @ node : used to insert the boardinfo object in the I3C boardinfo list
* @ init_dyn_addr : initial dynamic address requested by the FW . We provide no
* guarantee that the device will end up using this address ,
* but try our best to assign this specific address to the
* device
* @ static_addr : static address the I3C device listen on before it ' s been
* assigned a dynamic address by the master . Will be used during
* bus initialization to assign it a specific dynamic address
* before starting DAA ( Dynamic Address Assignment )
* @ pid : I3C Provisioned ID exposed by the device . This is a unique identifier
* that may be used to attach boardinfo to i3c_dev_desc when the device
* does not have a static address
* @ of_node : optional DT node in case the device has been described in the DT
*
* This structure is used to attach board - level information to an I3C device .
* Not all I3C devices connected on the bus will have a boardinfo . It ' s only
* needed if you want to attach extra resources to a device or assign it a
* specific dynamic address .
*/
struct i3c_dev_boardinfo {
struct list_head node;
u8 init_dyn_addr;
u8 static_addr;
u64 pid;
struct device_node *of_node;
};
/**
* struct i3c_dev_desc - I3C device descriptor
* @ common : common part of the I3C device descriptor
* @ info : I3C device information . Will be automatically filled when you create
* your device with i3c_master_add_i3c_dev_locked ( )
* @ ibi_lock : lock used to protect the & struct_i3c_device - > ibi
* @ ibi : IBI info attached to a device . Should be NULL until
* i3c_device_request_ibi ( ) is called
* @ dev : pointer to the I3C device object exposed to I3C device drivers . This
* should never be accessed from I3C master controller drivers . Only core
* code should manipulate it in when updating the dev < - > desc link or
* when propagating IBI events to the driver
* @ boardinfo : pointer to the boardinfo attached to this I3C device
*
* Internal representation of an I3C device . This object is only used by the
* core and passed to I3C master controller drivers when they ' re requested to
* do some operations on the device .
* The core maintains the link between the internal I3C dev descriptor and the
* object exposed to the I3C device drivers ( & struct_i3c_device ) .
*/
struct i3c_dev_desc {
struct i3c_i2c_dev_desc common;
struct i3c_device_info info;
struct mutex ibi_lock;
struct i3c_device_ibi_info *ibi;
struct i3c_device *dev;
const struct i3c_dev_boardinfo *boardinfo;
};
/**
* struct i3c_device - I3C device object
* @ dev : device object to register the I3C dev to the device model
* @ desc : pointer to an i3c device descriptor object . This link is updated
* every time the I3C device is rediscovered with a different dynamic
* address assigned
* @ bus : I3C bus this device is attached to
*
* I3C device object exposed to I3C device drivers . The takes care of linking
* this object to the relevant & struct_i3c_dev_desc one .
* All I3C devs on the I3C bus are represented , including I3C masters . For each
* of them , we have an instance of & struct i3c_device .
*/
struct i3c_device {
struct device dev;
struct i3c_dev_desc *desc;
struct i3c_bus *bus;
};
/*
* The I3C specification says the maximum number of devices connected on the
* bus is 11 , but this number depends on external parameters like trace length ,
* capacitive load per Device , and the types of Devices present on the Bus .
* I3C master can also have limitations , so this number is just here as a
* reference and should be adjusted on a per - controller / per - board basis .
*/
#define I3C_BUS_MAX_DEVS 11
/* Taken from the I3C Spec V1.1.1, chapter 6.2. "Timing specification" */
#define I3C_BUS_I2C_FM_PLUS_SCL_MAX_RATE 1000000
#define I3C_BUS_I2C_FM_SCL_MAX_RATE 400000
#define I3C_BUS_I3C_SCL_MAX_RATE 12900000
#define I3C_BUS_I3C_SCL_TYP_RATE 12500000
#define I3C_BUS_TAVAL_MIN_NS 1000
#define I3C_BUS_TBUF_MIXED_FM_MIN_NS 1300
#define I3C_BUS_THIGH_MIXED_MAX_NS 41
#define I3C_BUS_TIDLE_MIN_NS 200000
#define I3C_BUS_TLOW_OD_MIN_NS 200
/**
* enum i3c_bus_mode - I3C bus mode
* @ I3C_BUS_MODE_PURE : only I3C devices are connected to the bus . No limitation
* expected
* @ I3C_BUS_MODE_MIXED_FAST : I2C devices with 50 ns spike filter are present on
* the bus . The only impact in this mode is that the
* high SCL pulse has to stay below 50 ns to trick I2C
* devices when transmitting I3C frames
* @ I3C_BUS_MODE_MIXED_LIMITED : I2C devices without 50 ns spike filter are
* present on the bus . However they allow
* compliance up to the maximum SDR SCL clock
* frequency .
* @ I3C_BUS_MODE_MIXED_SLOW : I2C devices without 50 ns spike filter are present
* on the bus
*/
enum i3c_bus_mode {
I3C_BUS_MODE_PURE,
I3C_BUS_MODE_MIXED_FAST,
I3C_BUS_MODE_MIXED_LIMITED,
I3C_BUS_MODE_MIXED_SLOW,
};
/**
* enum i3c_open_drain_speed - I3C open - drain speed
* @ I3C_OPEN_DRAIN_SLOW_SPEED : Slow open - drain speed for sending the first
* broadcast address . The first broadcast address at this speed
* will be visible to all devices on the I3C bus . I3C devices
* working in I2C mode will turn off their spike filter when
* switching into I3C mode .
* @ I3C_OPEN_DRAIN_NORMAL_SPEED : Normal open - drain speed in I3C bus mode .
*/
enum i3c_open_drain_speed {
I3C_OPEN_DRAIN_SLOW_SPEED,
I3C_OPEN_DRAIN_NORMAL_SPEED,
};
/**
* enum i3c_addr_slot_status - I3C address slot status
* @ I3C_ADDR_SLOT_FREE : address is free
* @ I3C_ADDR_SLOT_RSVD : address is reserved
* @ I3C_ADDR_SLOT_I2C_DEV : address is assigned to an I2C device
* @ I3C_ADDR_SLOT_I3C_DEV : address is assigned to an I3C device
* @ I3C_ADDR_SLOT_STATUS_MASK : address slot mask
* @ I3C_ADDR_SLOT_EXT_STATUS_MASK : address slot mask with extended information
* @ I3C_ADDR_SLOT_EXT_DESIRED : the bitmask represents addresses that are preferred by some devices ,
* such as the " assigned - address " property in a device tree source .
* On an I3C bus , addresses are assigned dynamically , and we need to know which
* addresses are free to use and which ones are already assigned .
*
* Addresses marked as reserved are those reserved by the I3C protocol
* ( broadcast address , . . . ) .
*/
enum i3c_addr_slot_status {
I3C_ADDR_SLOT_FREE,
I3C_ADDR_SLOT_RSVD,
I3C_ADDR_SLOT_I2C_DEV,
I3C_ADDR_SLOT_I3C_DEV,
I3C_ADDR_SLOT_STATUS_MASK = 3 ,
I3C_ADDR_SLOT_EXT_STATUS_MASK = 7 ,
I3C_ADDR_SLOT_EXT_DESIRED = BIT(2 ),
};
#define I3C_ADDR_SLOT_STATUS_BITS 4
/**
* struct i3c_bus - I3C bus object
* @ cur_master : I3C master currently driving the bus . Since I3C is multi - master
* this can change over the time . Will be used to let a master
* know whether it needs to request bus ownership before sending
* a frame or not
* @ id : bus ID . Assigned by the framework when register the bus
* @ addrslots : a bitmap with 2 - bits per - slot to encode the address status and
* ease the DAA ( Dynamic Address Assignment ) procedure ( see
* & enum i3c_addr_slot_status )
* @ mode : bus mode ( see & enum i3c_bus_mode )
* @ scl_rate . i3c : maximum rate for the clock signal when doing I3C SDR / priv
* transfers
* @ scl_rate . i2c : maximum rate for the clock signal when doing I2C transfers
* @ scl_rate : SCL signal rate for I3C and I2C mode
* @ devs . i3c : contains a list of I3C device descriptors representing I3C
* devices connected on the bus and successfully attached to the
* I3C master
* @ devs . i2c : contains a list of I2C device descriptors representing I2C
* devices connected on the bus and successfully attached to the
* I3C master
* @ devs : 2 lists containing all I3C / I2C devices connected to the bus
* @ lock : read / write lock on the bus . This is needed to protect against
* operations that have an impact on the whole bus and the devices
* connected to it . For example , when asking slaves to drop their
* dynamic address ( RSTDAA CCC ) , we need to make sure no one is trying
* to send I3C frames to these devices .
* Note that this lock does not protect against concurrency between
* devices : several drivers can send different I3C / I2C frames through
* the same master in parallel . This is the responsibility of the
* master to guarantee that frames are actually sent sequentially and
* not interlaced
*
* The I3C bus is represented with its own object and not implicitly described
* by the I3C master to cope with the multi - master functionality , where one bus
* can be shared amongst several masters , each of them requesting bus ownership
* when they need to .
*/
struct i3c_bus {
struct i3c_dev_desc *cur_master;
int id;
unsigned long addrslots[((I2C_MAX_ADDR + 1 ) * I3C_ADDR_SLOT_STATUS_BITS) / BITS_PER_LONG];
enum i3c_bus_mode mode;
struct {
unsigned long i3c;
unsigned long i2c;
} scl_rate;
struct {
struct list_head i3c;
struct list_head i2c;
} devs;
struct rw_semaphore lock;
};
/**
* struct i3c_master_controller_ops - I3C master methods
* @ bus_init : hook responsible for the I3C bus initialization . You should at
* least call master_set_info ( ) from there and set the bus mode .
* You can also put controller specific initialization in there .
* This method is mandatory .
* @ bus_cleanup : cleanup everything done in
* & i3c_master_controller_ops - > bus_init ( ) .
* This method is optional .
* @ attach_i3c_dev : called every time an I3C device is attached to the bus . It
* can be after a DAA or when a device is statically declared
* by the FW , in which case it will only have a static address
* and the dynamic address will be 0 .
* When this function is called , device information have not
* been retrieved yet .
* This is a good place to attach master controller specific
* data to I3C devices .
* This method is optional .
* @ reattach_i3c_dev : called every time an I3C device has its addressed
* changed . It can be because the device has been powered
* down and has lost its address , or it can happen when a
* device had a static address and has been assigned a
* dynamic address with SETDASA .
* This method is optional .
* @ detach_i3c_dev : called when an I3C device is detached from the bus . Usually
* happens when the master device is unregistered .
* This method is optional .
* @ do_daa : do a DAA ( Dynamic Address Assignment ) procedure . This is procedure
* should send an ENTDAA CCC command and then add all devices
* discovered sure the DAA using i3c_master_add_i3c_dev_locked ( ) .
* Add devices added with i3c_master_add_i3c_dev_locked ( ) will then be
* attached or re - attached to the controller .
* This method is mandatory .
* @ supports_ccc_cmd : should return true if the CCC command is supported , false
* otherwise .
* This method is optional , if not provided the core assumes
* all CCC commands are supported .
* @ send_ccc_cmd : send a CCC command
* This method is mandatory .
* @ priv_xfers : do one or several private I3C SDR transfers
* This method is mandatory .
* @ attach_i2c_dev : called every time an I2C device is attached to the bus .
* This is a good place to attach master controller specific
* data to I2C devices .
* This method is optional .
* @ detach_i2c_dev : called when an I2C device is detached from the bus . Usually
* happens when the master device is unregistered .
* This method is optional .
* @ i2c_xfers : do one or several I2C transfers . Note that , unlike i3c
* transfers , the core does not guarantee that buffers attached to
* the transfers are DMA - safe . If drivers want to have DMA - safe
* buffers , they should use the i2c_get_dma_safe_msg_buf ( )
* and i2c_put_dma_safe_msg_buf ( ) helpers provided by the I2C
* framework .
* This method is mandatory .
* @ request_ibi : attach an IBI handler to an I3C device . This implies defining
* an IBI handler and the constraints of the IBI ( maximum payload
* length and number of pre - allocated slots ) .
* Some controllers support less IBI - capable devices than regular
* devices , so this method might return - % EBUSY if there ' s no
* more space for an extra IBI registration
* This method is optional .
* @ free_ibi : free an IBI previously requested with - > request_ibi ( ) . The IBI
* should have been disabled with - > disable_irq ( ) prior to that
* This method is mandatory only if - > request_ibi is not NULL .
* @ enable_ibi : enable the IBI . Only valid if - > request_ibi ( ) has been called
* prior to - > enable_ibi ( ) . The controller should first enable
* the IBI on the controller end ( for example , unmask the hardware
* IRQ ) and then send the ENEC CCC command ( with the IBI flag set )
* to the I3C device .
* This method is mandatory only if - > request_ibi is not NULL .
* @ disable_ibi : disable an IBI . First send the DISEC CCC command with the IBI
* flag set and then deactivate the hardware IRQ on the
* controller end .
* This method is mandatory only if - > request_ibi is not NULL .
* @ recycle_ibi_slot : recycle an IBI slot . Called every time an IBI has been
* processed by its handler . The IBI slot should be put back
* in the IBI slot pool so that the controller can re - use it
* for a future IBI
* This method is mandatory only if - > request_ibi is not
* NULL .
* @ enable_hotjoin : enable hot join event detect .
* @ disable_hotjoin : disable hot join event detect .
* @ set_speed : adjust I3C open drain mode timing .
*/
struct i3c_master_controller_ops {
int (*bus_init)(struct i3c_master_controller *master);
void (*bus_cleanup)(struct i3c_master_controller *master);
int (*attach_i3c_dev)(struct i3c_dev_desc *dev);
int (*reattach_i3c_dev)(struct i3c_dev_desc *dev, u8 old_dyn_addr);
void (*detach_i3c_dev)(struct i3c_dev_desc *dev);
int (*do_daa)(struct i3c_master_controller *master);
bool (*supports_ccc_cmd)(struct i3c_master_controller *master,
const struct i3c_ccc_cmd *cmd);
int (*send_ccc_cmd)(struct i3c_master_controller *master,
struct i3c_ccc_cmd *cmd);
int (*priv_xfers)(struct i3c_dev_desc *dev,
struct i3c_priv_xfer *xfers,
int nxfers);
int (*attach_i2c_dev)(struct i2c_dev_desc *dev);
void (*detach_i2c_dev)(struct i2c_dev_desc *dev);
int (*i2c_xfers)(struct i2c_dev_desc *dev,
struct i2c_msg *xfers, int nxfers);
int (*request_ibi)(struct i3c_dev_desc *dev,
const struct i3c_ibi_setup *req);
void (*free_ibi)(struct i3c_dev_desc *dev);
int (*enable_ibi)(struct i3c_dev_desc *dev);
int (*disable_ibi)(struct i3c_dev_desc *dev);
void (*recycle_ibi_slot)(struct i3c_dev_desc *dev,
struct i3c_ibi_slot *slot);
int (*enable_hotjoin)(struct i3c_master_controller *master);
int (*disable_hotjoin)(struct i3c_master_controller *master);
int (*set_speed)(struct i3c_master_controller *master, enum i3c_open_drain_speed speed);
};
/**
* struct i3c_master_controller - I3C master controller object
* @ dev : device to be registered to the device - model
* @ this : an I3C device object representing this master . This device will be
* added to the list of I3C devs available on the bus
* @ i2c : I2C adapter used for backward compatibility . This adapter is
* registered to the I2C subsystem to be as transparent as possible to
* existing I2C drivers
* @ ops : master operations . See & struct i3c_master_controller_ops
* @ secondary : true if the master is a secondary master
* @ init_done : true when the bus initialization is done
* @ hotjoin : true if the master support hotjoin
* @ boardinfo . i3c : list of I3C boardinfo objects
* @ boardinfo . i2c : list of I2C boardinfo objects
* @ boardinfo : board - level information attached to devices connected on the bus
* @ bus : I3C bus exposed by this master
* @ wq : workqueue which can be used by master
* drivers if they need to postpone operations that need to take place
* in a thread context . Typical examples are Hot Join processing which
* requires taking the bus lock in maintenance , which in turn , can only
* be done from a sleep - able context
*
* A & struct i3c_master_controller has to be registered to the I3C subsystem
* through i3c_master_register ( ) . None of & struct i3c_master_controller fields
* should be set manually , just pass appropriate values to
* i3c_master_register ( ) .
*/
struct i3c_master_controller {
struct device dev;
struct i3c_dev_desc *this ;
struct i2c_adapter i2c;
const struct i3c_master_controller_ops *ops;
unsigned int secondary : 1 ;
unsigned int init_done : 1 ;
unsigned int hotjoin: 1 ;
struct {
struct list_head i3c;
struct list_head i2c;
} boardinfo;
struct i3c_bus bus;
struct workqueue_struct *wq;
};
/**
* i3c_bus_for_each_i2cdev ( ) - iterate over all I2C devices present on the bus
* @ bus : the I3C bus
* @ dev : an I2C device descriptor pointer updated to point to the current slot
* at each iteration of the loop
*
* Iterate over all I2C devs present on the bus .
*/
#define i3c_bus_for_each_i2cdev(bus, dev) \
list_for_each_entry(dev, &(bus)->devs.i2c, common.node)
/**
* i3c_bus_for_each_i3cdev ( ) - iterate over all I3C devices present on the bus
* @ bus : the I3C bus
* @ dev : and I3C device descriptor pointer updated to point to the current slot
* at each iteration of the loop
*
* Iterate over all I3C devs present on the bus .
*/
#define i3c_bus_for_each_i3cdev(bus, dev) \
list_for_each_entry(dev, &(bus)->devs.i3c, common.node)
int i3c_master_do_i2c_xfers(struct i3c_master_controller *master,
const struct i2c_msg *xfers,
int nxfers);
int i3c_master_disec_locked(struct i3c_master_controller *master, u8 addr,
u8 evts);
int i3c_master_enec_locked(struct i3c_master_controller *master, u8 addr,
u8 evts);
int i3c_master_entdaa_locked(struct i3c_master_controller *master);
int i3c_master_defslvs_locked(struct i3c_master_controller *master);
int i3c_master_get_free_addr(struct i3c_master_controller *master,
u8 start_addr);
int i3c_master_add_i3c_dev_locked(struct i3c_master_controller *master,
u8 addr);
int i3c_master_do_daa(struct i3c_master_controller *master);
int i3c_master_set_info(struct i3c_master_controller *master,
const struct i3c_device_info *info);
int i3c_master_register(struct i3c_master_controller *master,
struct device *parent,
const struct i3c_master_controller_ops *ops,
bool secondary);
void i3c_master_unregister(struct i3c_master_controller *master);
int i3c_master_enable_hotjoin(struct i3c_master_controller *master);
int i3c_master_disable_hotjoin(struct i3c_master_controller *master);
/**
* i3c_dev_get_master_data ( ) - get master private data attached to an I3C
* device descriptor
* @ dev : the I3C device descriptor to get private data from
*
* Return : the private data previously attached with i3c_dev_set_master_data ( )
* or NULL if no data has been attached to the device .
*/
static inline void *i3c_dev_get_master_data(const struct i3c_dev_desc *dev)
{
return dev->common.master_priv;
}
/**
* i3c_dev_set_master_data ( ) - attach master private data to an I3C device
* descriptor
* @ dev : the I3C device descriptor to attach private data to
* @ data : private data
*
* This functions allows a master controller to attach per - device private data
* which can then be retrieved with i3c_dev_get_master_data ( ) .
*/
static inline void i3c_dev_set_master_data(struct i3c_dev_desc *dev,
void *data)
{
dev->common.master_priv = data;
}
/**
* i2c_dev_get_master_data ( ) - get master private data attached to an I2C
* device descriptor
* @ dev : the I2C device descriptor to get private data from
*
* Return : the private data previously attached with i2c_dev_set_master_data ( )
* or NULL if no data has been attached to the device .
*/
static inline void *i2c_dev_get_master_data(const struct i2c_dev_desc *dev)
{
return dev->common.master_priv;
}
/**
* i2c_dev_set_master_data ( ) - attach master private data to an I2C device
* descriptor
* @ dev : the I2C device descriptor to attach private data to
* @ data : private data
*
* This functions allows a master controller to attach per - device private data
* which can then be retrieved with i2c_device_get_master_data ( ) .
*/
static inline void i2c_dev_set_master_data(struct i2c_dev_desc *dev,
void *data)
{
dev->common.master_priv = data;
}
/**
* i3c_dev_get_master ( ) - get master used to communicate with a device
* @ dev : I3C dev
*
* Return : the master controller driving @ dev
*/
static inline struct i3c_master_controller *
i3c_dev_get_master(struct i3c_dev_desc *dev)
{
return dev->common.master;
}
/**
* i2c_dev_get_master ( ) - get master used to communicate with a device
* @ dev : I2C dev
*
* Return : the master controller driving @ dev
*/
static inline struct i3c_master_controller *
i2c_dev_get_master(struct i2c_dev_desc *dev)
{
return dev->common.master;
}
/**
* i3c_master_get_bus ( ) - get the bus attached to a master
* @ master : master object
*
* Return : the I3C bus @ master is connected to
*/
static inline struct i3c_bus *
i3c_master_get_bus(struct i3c_master_controller *master)
{
return &master->bus;
}
struct i3c_generic_ibi_pool;
struct i3c_generic_ibi_pool *
i3c_generic_ibi_alloc_pool(struct i3c_dev_desc *dev,
const struct i3c_ibi_setup *req);
void i3c_generic_ibi_free_pool(struct i3c_generic_ibi_pool *pool);
struct i3c_ibi_slot *
i3c_generic_ibi_get_free_slot(struct i3c_generic_ibi_pool *pool);
void i3c_generic_ibi_recycle_slot(struct i3c_generic_ibi_pool *pool,
struct i3c_ibi_slot *slot);
void i3c_master_queue_ibi(struct i3c_dev_desc *dev, struct i3c_ibi_slot *slot);
struct i3c_ibi_slot *i3c_master_get_free_ibi_slot(struct i3c_dev_desc *dev);
void i3c_for_each_bus_locked(int (*fn)(struct i3c_bus *bus, void *data),
void *data);
int i3c_register_notifier(struct notifier_block *nb);
int i3c_unregister_notifier(struct notifier_block *nb);
#endif /* I3C_MASTER_H */
Messung V0.5 in Prozent C=90 H=97 G=93
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