iicbb.c File Reference

#include <sys/cdefs.h>
#include "opt_platform.h"
#include <sys/param.h>
#include <sys/kernel.h>
#include <sys/systm.h>
#include <sys/module.h>
#include <sys/bus.h>
#include <sys/sysctl.h>
#include <sys/uio.h>
#include <dev/iicbus/iiconf.h>
#include <dev/iicbus/iicbus.h>
#include <dev/smbus/smbconf.h>
#include "iicbus_if.h"
#include "iicbb_if.h"

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Data Structures
struct	iicbb_softc

Macros
#define	DEFAULT_SCL_LOW_TIMEOUT   (25 * 1000)
#define	IICBB_DEBUG
#define	I2C_DEBUG(x)
#define	I2C_GETSDA(dev)   (IICBB_GETSDA(device_get_parent(dev)))
#define	I2C_SETSDA(dev, x)   (IICBB_SETSDA(device_get_parent(dev), x))
#define	I2C_GETSCL(dev)   (IICBB_GETSCL(device_get_parent(dev)))
#define	I2C_SETSCL(dev, x)   (IICBB_SETSCL(device_get_parent(dev), x))

Functions
	__FBSDID ("$FreeBSD$")
static int	iicbb_attach (device_t)
static void	iicbb_child_detached (device_t, device_t)
static int	iicbb_detach (device_t)
static int	iicbb_print_child (device_t, device_t)
static int	iicbb_probe (device_t)
static int	iicbb_callback (device_t, int, caddr_t)
static int	iicbb_start (device_t, u_char, int)
static int	iicbb_repstart (device_t, u_char, int)
static int	iicbb_stop (device_t)
static int	iicbb_write (device_t, const char *, int, int *, int)
static int	iicbb_read (device_t, char *, int, int *, int, int)
static int	iicbb_reset (device_t, u_char, u_char, u_char *)
static int	iicbb_transfer (device_t dev, struct iic_msg *msgs, uint32_t nmsgs)
static void	iicbb_set_speed (struct iicbb_softc *sc, u_char)
	SYSCTL_DECL (_hw_i2c)
	SYSCTL_INT (_hw_i2c, OID_AUTO, iicbb_debug, CTLFLAG_RWTUN, &i2c_debug, 0, "Enable i2c bit-banging driver debug")
static int	iicbb_waitforscl (device_t dev)
static int	iicbb_clockin (device_t dev, int sda)
static void	iicbb_clockout (device_t dev)
static int	iicbb_sendbit (device_t dev, int bit)
static int	iicbb_getack (device_t dev)
static int	iicbb_sendbyte (device_t dev, uint8_t data)
static int	iicbb_readbyte (device_t dev, bool last, uint8_t *data)
static int	iicbb_start_impl (device_t dev, u_char slave, bool repstart)
	DRIVER_MODULE (iicbus, iicbb, iicbus_driver, iicbus_devclass, 0, 0)
	MODULE_DEPEND (iicbb, iicbus, IICBUS_MINVER, IICBUS_PREFVER, IICBUS_MAXVER)
	MODULE_VERSION (iicbb, IICBB_MODVER)

Variables
static device_method_t	iicbb_methods []
driver_t	iicbb_driver
devclass_t	iicbb_devclass
static int	i2c_debug = 0

Macro Definition Documentation

DEFAULT_SCL_LOW_TIMEOUT

#define DEFAULT_SCL_LOW_TIMEOUT   (25 * 1000)

Definition at line 73 of file iicbb.c.

I2C_DEBUG

#define I2C_DEBUG

(

x

)

Value:

                do {            \
                if (i2c_debug) (x);     \
        } while (0)

Definition at line 235 of file iicbb.c.

I2C_GETSCL

#define I2C_GETSCL

(

dev

)

(IICBB_GETSCL(device_get_parent(dev)))

Definition at line 244 of file iicbb.c.

I2C_GETSDA

#define I2C_GETSDA

(

dev

)

(IICBB_GETSDA(device_get_parent(dev)))

Definition at line 242 of file iicbb.c.

I2C_SETSCL

#define I2C_SETSCL	(		dev,
			x
	)		(IICBB_SETSCL(device_get_parent(dev), x))

Definition at line 245 of file iicbb.c.

I2C_SETSDA

#define I2C_SETSDA	(		dev,
			x
	)		(IICBB_SETSDA(device_get_parent(dev), x))

Definition at line 243 of file iicbb.c.

IICBB_DEBUG

#define IICBB_DEBUG

Definition at line 227 of file iicbb.c.

Function Documentation

__FBSDID()

__FBSDID

(

"$FreeBSD$"

)

DRIVER_MODULE()

DRIVER_MODULE	(	iicbus	,
		iicbb	,
		iicbus_driver	,
		iicbus_devclass	,
		0	,
		0
	)

iicbb_attach()

static int iicbb_attach ( device_t  dev )

static

Definition at line 146 of file iicbb.c.

References DEFAULT_SCL_LOW_TIMEOUT, dev, iicbb_softc::iicbus, iicbb_softc::io_latency, iicbb_softc::scl_low_timeout, and iicbb_softc::udelay.

iicbb_callback()

static int iicbb_callback ( device_t  dev, int  index, caddr_t  data  )

static

Definition at line 424 of file iicbb.c.

References data, dev, and index.

iicbb_child_detached()

static void iicbb_child_detached ( device_t  dev, device_t  child  )

static

Definition at line 195 of file iicbb.c.

References dev, and iicbb_softc::iicbus.

iicbb_clockin()

static int iicbb_clockin ( device_t  dev, int  sda  )

static

Definition at line 277 of file iicbb.c.

References dev, I2C_SETSCL, I2C_SETSDA, and iicbb_waitforscl().

Referenced by iicbb_getack(), iicbb_sendbit(), iicbb_start_impl(), and iicbb_stop().

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iicbb_clockout()

static void iicbb_clockout ( device_t  dev )

static

Definition at line 301 of file iicbb.c.

References dev, I2C_SETSCL, and iicbb_softc::udelay.

Referenced by iicbb_getack(), iicbb_readbyte(), iicbb_sendbit(), and iicbb_start_impl().

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iicbb_detach()

static int iicbb_detach ( device_t  dev )

static

Definition at line 175 of file iicbb.c.

References dev.

iicbb_getack()

static int iicbb_getack ( device_t  dev )

static

Definition at line 343 of file iicbb.c.

References dev, I2C_DEBUG, I2C_GETSDA, IIC_ENOACK, iicbb_clockin(), iicbb_clockout(), and iicbb_softc::udelay.

Referenced by iicbb_start_impl(), and iicbb_write().

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iicbb_print_child()

static int iicbb_print_child ( device_t  bus, device_t  dev  )

static

Definition at line 204 of file iicbb.c.

References dev, IIC_ENOADDR, IIC_FASTEST, and oldaddr.

iicbb_probe()

static int iicbb_probe ( device_t  dev )

static

Definition at line 138 of file iicbb.c.

References dev.

iicbb_read()

static int iicbb_read ( device_t  dev, char *  buf, int  len, int *  read, int  last, int  delay  )

static

Definition at line 549 of file iicbb.c.

References buf, bytes, dev, iicbb_readbyte(), last, len, and read.

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iicbb_readbyte()

static int iicbb_readbyte ( device_t  dev, bool  last, uint8_t *  data  )

static

Definition at line 388 of file iicbb.c.

References data, dev, I2C_DEBUG, I2C_GETSDA, I2C_SETSCL, I2C_SETSDA, iicbb_clockout(), iicbb_sendbit(), iicbb_waitforscl(), last, and iicbb_softc::udelay.

Referenced by iicbb_read().

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iicbb_repstart()

static int iicbb_repstart ( device_t  dev, u_char  slave, int  timeout  )

static

Definition at line 498 of file iicbb.c.

References dev, iicbb_start_impl(), and slave.

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iicbb_reset()

static int iicbb_reset ( device_t  dev, u_char  speed, u_char  addr, u_char *  oldaddr  )

static

Definition at line 430 of file iicbb.c.

References addr, dev, iicbb_set_speed(), oldaddr, and speed.

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iicbb_sendbit()

static int iicbb_sendbit ( device_t  dev, int  bit  )

static

Definition at line 315 of file iicbb.c.

References dev, iicbb_clockin(), iicbb_clockout(), and iicbb_softc::udelay.

Referenced by iicbb_readbyte(), and iicbb_sendbyte().

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iicbb_sendbyte()

static int iicbb_sendbyte ( device_t  dev, uint8_t  data  )

static

Definition at line 372 of file iicbb.c.

References data, dev, I2C_DEBUG, and iicbb_sendbit().

Referenced by iicbb_start_impl(), and iicbb_write().

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iicbb_set_speed()

static void iicbb_set_speed ( struct iicbb_softc *  sc, u_char  speed  )

static

Definition at line 584 of file iicbb.c.

References iicbb_softc::iicbus, iicbb_softc::io_latency, speed, and iicbb_softc::udelay.

Referenced by iicbb_reset().

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iicbb_start()

static int iicbb_start ( device_t  dev, u_char  slave, int  timeout  )

static

Definition at line 491 of file iicbb.c.

References dev, iicbb_start_impl(), and slave.

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iicbb_start_impl()

static int iicbb_start_impl ( device_t  dev, u_char  slave, bool  repstart  )

static

Definition at line 437 of file iicbb.c.

References dev, I2C_DEBUG, I2C_GETSDA, I2C_SETSDA, IIC_EBUSERR, iicbb_clockin(), iicbb_clockout(), iicbb_getack(), iicbb_sendbyte(), iicbb_stop(), iicbb_waitforscl(), slave, and iicbb_softc::udelay.

Referenced by iicbb_repstart(), and iicbb_start().

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iicbb_stop()

static int iicbb_stop ( device_t  dev )

static

Definition at line 504 of file iicbb.c.

References dev, I2C_DEBUG, I2C_SETSDA, iicbb_clockin(), and iicbb_softc::udelay.

Referenced by iicbb_start_impl().

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iicbb_transfer()

static int iicbb_transfer ( device_t  dev, struct iic_msg *  msgs, uint32_t  nmsgs  )

static

Definition at line 569 of file iicbb.c.

References dev, iicbus_transfer_gen(), msgs, and nmsgs.

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iicbb_waitforscl()

static int iicbb_waitforscl ( device_t  dev )

static

Definition at line 248 of file iicbb.c.

References dev, I2C_DEBUG, I2C_GETSCL, IIC_ETIMEOUT, iicbb_softc::scl_low_timeout, and timeout.

Referenced by iicbb_clockin(), iicbb_readbyte(), and iicbb_start_impl().

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iicbb_write()

static int iicbb_write ( device_t  dev, const char *  buf, int  len, int *  sent, int  timeout  )

static

Definition at line 526 of file iicbb.c.

References buf, bytes, dev, iicbb_getack(), iicbb_sendbyte(), and len.

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MODULE_DEPEND()

MODULE_DEPEND	(	iicbb	,
		iicbus	,
		IICBUS_MINVER	,
		IICBUS_PREFVER	,
		IICBUS_MAXVER
	)

MODULE_VERSION()

MODULE_VERSION	(	iicbb	,
		IICBB_MODVER
	)

SYSCTL_DECL()

SYSCTL_DECL

(

_hw_i2c

)

SYSCTL_INT()

SYSCTL_INT	(	_hw_i2c	,
		OID_AUTO	,
		iicbb_debug	,
		CTLFLAG_RWTUN	,
		&	i2c_debug,
		0	,
		"Enable i2c bit-banging driver debug"
	)

Variable Documentation

i2c_debug

int i2c_debug = 0

static

Definition at line 229 of file iicbb.c.

iicbb_devclass

devclass_t iicbb_devclass

Definition at line 135 of file iicbb.c.

iicbb_driver

driver_t iicbb_driver

Initial value:

= {
        "iicbb",
        iicbb_methods,
        sizeof(struct iicbb_softc),
}

Definition at line 129 of file iicbb.c.

iicbb_methods

device_method_t iicbb_methods[]

static

Initial value:

= {
        
        DEVMETHOD(device_probe,         iicbb_probe),
        DEVMETHOD(device_attach,        iicbb_attach),
        DEVMETHOD(device_detach,        iicbb_detach),
 
        
        DEVMETHOD(bus_child_detached,   iicbb_child_detached),
        DEVMETHOD(bus_print_child,      iicbb_print_child),
 
        
        DEVMETHOD(iicbus_callback,      iicbb_callback),
        DEVMETHOD(iicbus_start,         iicbb_start),
        DEVMETHOD(iicbus_repeated_start, iicbb_repstart),
        DEVMETHOD(iicbus_stop,          iicbb_stop),
        DEVMETHOD(iicbus_write,         iicbb_write),
        DEVMETHOD(iicbus_read,          iicbb_read),
        DEVMETHOD(iicbus_reset,         iicbb_reset),
        DEVMETHOD(iicbus_transfer,      iicbb_transfer),
 
 
 
 
 
 
        { 0, 0 }
}

Definition at line 101 of file iicbb.c.