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/*-
* Copyright (c) 2011 Justin Hibbits
* Copyright (c) 2010 Andreas Tobler
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
* IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
* BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
* LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
* AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
* OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*/
#include <sys/cdefs.h>
__FBSDID("$FreeBSD$");
#include <sys/param.h>
#include <sys/bus.h>
#include <sys/systm.h>
#include <sys/module.h>
#include <sys/callout.h>
#include <sys/conf.h>
#include <sys/cpu.h>
#include <sys/ctype.h>
#include <sys/kernel.h>
#include <sys/kthread.h>
#include <sys/limits.h>
#include <sys/reboot.h>
#include <sys/rman.h>
#include <sys/sysctl.h>
#include <sys/unistd.h>
#include <machine/bus.h>
#include <machine/md_var.h>
#include <dev/iicbus/iicbus.h>
#include <dev/iicbus/iiconf.h>
#include <dev/ofw/openfirm.h>
#include <dev/ofw/ofw_bus.h>
#include <powerpc/powermac/powermac_thermal.h>
struct adm1030_softc {
struct pmac_fan fan;
device_t sc_dev;
struct intr_config_hook enum_hook;
uint32_t sc_addr;
int sc_pwm;
};
/* Regular bus attachment functions */
static int adm1030_probe(device_t);
static int adm1030_attach(device_t);
/* Utility functions */
static void adm1030_start(void *xdev);
static int adm1030_write_byte(device_t dev, uint32_t addr, uint8_t reg, uint8_t buf);
static int adm1030_set(struct adm1030_softc *fan, int pwm);
static int adm1030_sysctl(SYSCTL_HANDLER_ARGS);
static device_method_t adm1030_methods[] = {
/* Device interface */
DEVMETHOD(device_probe, adm1030_probe),
DEVMETHOD(device_attach, adm1030_attach),
{0, 0},
};
static driver_t adm1030_driver = {
"adm1030",
adm1030_methods,
sizeof(struct adm1030_softc)
};
static devclass_t adm1030_devclass;
DRIVER_MODULE(adm1030, iicbus, adm1030_driver, adm1030_devclass, 0, 0);
static int
adm1030_write_byte(device_t dev, uint32_t addr, uint8_t reg, uint8_t byte)
{
unsigned char buf[4];
int try = 0;
struct iic_msg msg[] = {
{addr, IIC_M_WR, 0, buf}
};
msg[0].len = 2;
buf[0] = reg;
buf[1] = byte;
for (;;)
{
if (iicbus_transfer(dev, msg, 1) == 0)
return (0);
if (++try > 5) {
device_printf(dev, "iicbus write failed\n");
return (-1);
}
pause("adm1030_write_byte", hz);
}
}
static int
adm1030_probe(device_t dev)
{
const char *name, *compatible;
struct adm1030_softc *sc;
phandle_t handle;
phandle_t thermostat;
name = ofw_bus_get_name(dev);
compatible = ofw_bus_get_compat(dev);
handle = ofw_bus_get_node(dev);
if (!name)
return (ENXIO);
if (strcmp(name, "fan") != 0 || strcmp(compatible, "adm1030") != 0)
return (ENXIO);
/* This driver can only be used if there's an associated temp sensor. */
if (OF_getprop(handle, "platform-getTemp", &thermostat, sizeof(thermostat)) < 0)
return (ENXIO);
sc = device_get_softc(dev);
sc->sc_dev = dev;
sc->sc_addr = iicbus_get_addr(dev);
device_set_desc(dev, "G4 MDD Fan driver");
return (0);
}
static int
adm1030_attach(device_t dev)
{
struct adm1030_softc *sc;
struct sysctl_ctx_list *ctx;
struct sysctl_oid *tree;
sc = device_get_softc(dev);
sc->enum_hook.ich_func = adm1030_start;
sc->enum_hook.ich_arg = dev;
/*
* Wait until interrupts are available, which won't be until the openpic is
* intialized.
*/
if (config_intrhook_establish(&sc->enum_hook) != 0)
return (ENOMEM);
ctx = device_get_sysctl_ctx(dev);
tree = device_get_sysctl_tree(dev);
SYSCTL_ADD_PROC(ctx, SYSCTL_CHILDREN(tree), OID_AUTO, "pwm",
CTLTYPE_INT | CTLFLAG_RW | CTLFLAG_MPSAFE, dev,
0, adm1030_sysctl, "I", "Fan PWM Rate");
return (0);
}
static void
adm1030_start(void *xdev)
{
struct adm1030_softc *sc;
device_t dev = (device_t) xdev;
sc = device_get_softc(dev);
/* Start the adm1030 device. */
adm1030_write_byte(sc->sc_dev, sc->sc_addr, 0x1, 0x1);
adm1030_write_byte(sc->sc_dev, sc->sc_addr, 0x0, 0x95);
adm1030_write_byte(sc->sc_dev, sc->sc_addr, 0x23, 0x91);
/* Use the RPM fields as PWM duty cycles. */
sc->fan.min_rpm = 0;
sc->fan.max_rpm = 0x0F;
sc->fan.default_rpm = 2;
strcpy(sc->fan.name, "MDD Case fan");
sc->fan.zone = 0;
sc->fan.read = NULL;
sc->fan.set = (int (*)(struct pmac_fan *, int))adm1030_set;
config_intrhook_disestablish(&sc->enum_hook);
pmac_thermal_fan_register(&sc->fan);
}
static int adm1030_set(struct adm1030_softc *fan, int pwm)
{
/* Clamp the PWM to 0-0xF, one nibble. */
if (pwm > 0xF)
pwm = 0xF;
if (pwm < 0)
pwm = 0;
if (adm1030_write_byte(fan->sc_dev, fan->sc_addr, 0x22, pwm) < 0)
return (-1);
fan->sc_pwm = pwm;
return (0);
}
static int
adm1030_sysctl(SYSCTL_HANDLER_ARGS)
{
device_t adm1030;
struct adm1030_softc *sc;
int pwm, error;
adm1030 = arg1;
sc = device_get_softc(adm1030);
pwm = sc->sc_pwm;
error = sysctl_handle_int(oidp, &pwm, 0, req);
if (error || !req->newptr)
return (error);
return (adm1030_set(sc, pwm));
}
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