82 lines
1.8 KiB
C
82 lines
1.8 KiB
C
/* Copyright (C) Charles Forsyth
|
|
* See /doc/license/NOTICE.Plan9-9k.txt for details about the licensing.
|
|
*/
|
|
/* Portions of this file are Copyright (C) 2015-2018 Giacomo Tesio <giacomo@tesio.it>
|
|
* See /doc/license/gpl-2.0.txt for details about the licensing.
|
|
*/
|
|
typedef struct SMBus SMBus;
|
|
typedef struct SMdev SMdev;
|
|
|
|
/* SMBus transactions */
|
|
enum
|
|
{
|
|
SMBquick, /* sends address only */
|
|
|
|
/* write */
|
|
SMBsend, /* sends address and cmd */
|
|
SMBbytewrite, /* sends address and cmd and 1 byte */
|
|
SMBwordwrite, /* sends address and cmd and 2 bytes */
|
|
|
|
/* read */
|
|
SMBrecv, /* sends address, recvs 1 byte */
|
|
SMBbyteread, /* sends address and cmd, recv's byte */
|
|
SMBwordread, /* sends address and cmd, recv's 2 bytes */
|
|
|
|
/* read or write is a function of bit 0 in the slave addr */
|
|
// SMBquick= 0,
|
|
SMBbyte= 1,
|
|
SMBbytedata,
|
|
SMBworddata,
|
|
SMBprocess,
|
|
SMBblock,
|
|
SMBi2cread,
|
|
SMBblockprocess,
|
|
};
|
|
|
|
typedef struct Udid Udid;
|
|
struct Udid {
|
|
uint8_t cap;
|
|
uint8_t ver;
|
|
uint8_t vid[2];
|
|
uint8_t did[2];
|
|
uint8_t ifc[2];
|
|
uint8_t svid[2];
|
|
uint8_t sdid[2];
|
|
uint8_t vsid[4];
|
|
};
|
|
|
|
enum {
|
|
STsmb,
|
|
STi2c,
|
|
};
|
|
|
|
typedef struct Smbdev Smbdev;
|
|
struct Smbdev { // smbus relies on this structure format.
|
|
Udid udid;
|
|
uint8_t addr;
|
|
uint8_t type;
|
|
uint16_t vid;
|
|
uint16_t did;
|
|
};
|
|
|
|
typedef struct SMBus SMBus;
|
|
struct SMBus {
|
|
QLock; /* mutex */
|
|
Rendez r; /* rendezvous point for completion interrupts */
|
|
void *arg; /* implementation dependent */
|
|
uint32_t base; /* port or memory base of smbus */
|
|
int busy;
|
|
Smbdev* (*smbmatch)(Smbdev*, int, int);
|
|
int (*transact)(SMBus*, int, int, int, uint8_t*, int);
|
|
void (*enumerate)(SMBus*);
|
|
};
|
|
|
|
|
|
Smbdev* smbmatch(Smbdev*, int, int);
|
|
Smbdev* smbmatchaddr(int);
|
|
int smbrdbyte(Smbdev*, int);
|
|
int smbwrbyte(Smbdev*, int, int);
|
|
SMBus* smbus(void);
|
|
long smbctl(char*, long);
|
|
void smbreset(void);
|