Date: Tue, 5 Feb 2008 01:28:12 +0300 From: Artem Kim <artem_kim@inbox.ru> To: freebsd-questions@freebsd.org Subject: i2c driver newbie question Message-ID: <200802050128.12155.artem_kim@inbox.ru>
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Can anybody help my to write i2c drivers for saa7146 ?
I do not good understand how to connect this device to existing iicbus=20
infrastructure.
I do:
static device_method_t saa7146_i2c_methods[] =3D {
/* device interface */
DEVMETHOD(device_probe, saa7146_i2c_probe),
DEVMETHOD(device_attach, saa7146_i2c_attach),
DEVMETHOD(device_detach, saa7146_i2c_detach),
=20
/* iicbus interface */
DEVMETHOD(iicbus_callback, iicbus_null_callback),
DEVMETHOD(iicbus_repeated_start, saa7146_i2c_repeated_start),
DEVMETHOD(iicbus_start, saa7146_i2c_start),
DEVMETHOD(iicbus_stop, saa7146_i2c_stop),
DEVMETHOD(iicbus_write, saa7146_i2c_write),
DEVMETHOD(iicbus_read, saa7146_i2c_read),
DEVMETHOD(iicbus_reset, saa7146_i2c_rst_card),
{ 0, 0 }
};
static int
saa7146_i2c_probe(device_t dev)
{
=2E......
}
static int
saa7146_i2c_attach(device_t dev)
{
=09
//... Allocation of some resources
//add child
if ((sc->i2c_dev =3D device_add_child(dev, "iicbus", -1)) =3D=3D NULL)
device_printf(dev, "could not allocate iicbus instance\n");
bus_generic_attach(dev);
device_printf(dev, "%s complite\n", __FUNCTION__);
return (0);
}
static int
saa7146_i2c_start (device_t dev, u_char slave, int timeout)
{
......
}
=2E....
DRIVER_MODULE (saa7146_i2c, pci, saa7146_i2c_driver, saa7146_i2c_devclass,=
0,=20
0);
MODULE_DEPEND (saa7146_i2c, iicbus, SAA7146_I2C_MINVER, SAA7146_I2C_PREFVE=
R,=20
SAA7146_I2C_MAXVER);
MODULE_VERSION (saa7146_i2c, SAA7146_I2C_MODVER);
But this now work. =F3hild-device do not use any resource and is no active,=
and=20
calling any method of this device lead to panic.
What do I do wrong?
Thanks,
Artem
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