On 09/10/2016 23:22, Warner Losh wrote:
> There seems to be enough information present in the smbios data to
> know what devices are at what addresses. Perhaps we should use it as
> much as possible in well controlled situations to move this knowledge
> into the OS.
So, I was thinking about maybe doing something like this to preserve the status
quo, to avoid requiring manual hints and to lay a foundation for the proper
Chromebook I2C slave discovery:
static struct {
uint32_t ctlrid,
const char *name;
uint_t addr;
} slaves[] = {
{ 0x9c628086, "isl", 0x88 },
{ 0x9c628086, "cyapa", 0xce },
}
static void
chromebook_i2c_identify(driver_t *driver, device_t bus)
{
device_t controller;
device_t child;
int i;
/*
* A stop gap approach to preserve the status quo.
* A more intelligent approach is required to correctly
* identify a machine model and hadrdware available on it.
* For instance, DMI could be used.
* See
http://lxr.free-electrons.com/source/drivers/platform/chrome/chromeos_laptop.c
*/
controller = device_get_parent(bus);
if (strcmp(device_get_name(controller), "ig4iic") != 0)
return;
for (i = 0; i < nitems(slaves); i++) {
if (device_find_child(bus, slave->name, -1) != NULL)
continue;
if (slave->ctlrid != pci_get_devid(controller))
continue;
child = BUS_ADD_CHILD(bus, 0, slave->name, -1);
if (child != NULL)
iicbus_set_addr(child, slave->addr);
}
}
static device_method_t chromebook_i2c_methods[] = {
DEVMETHOD(device_identify, chromebook_i2c_identify),
{ 0, 0 }
};
static driver_t chromebook_i2c_driver = {
"chromebook_i2c",
chromebook_i2c_methods,
0 /* no softc */
};
static devclass_t chromebook_i2c_devclass;
DRIVER_MODULE(chromebook_i2c, iicbus, chromebook_i2c_driver,
chromebook_i2c_devclass, 0, 0);
MODULE_DEPEND(chromebook_i2c, iicbus, IICBUS_MINVER, IICBUS_PREFVER,
IICBUS_MAXVER);
MODULE_VERSION(chromebook_i2c, 1);
The idea is that this is a driver that listens for new iicbus-es and adds isl
and cyapa devices to a bus if some criteria are met.
--
Andriy Gapon
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