/* $NetBSD: g760a.c,v 1.6 2020/11/26 12:53:03 skrll Exp $ */
/*-
* Copyright (C) 2008 A.Leo.
*
* 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.
* 3. The name of the author may not be used to endorse or promote products
* derived from this software without specific prior written permission.
*
* 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.
*/
/*
* The driver for the G760A FAN Speed PWM controller.
*/
#include <sys/cdefs.h>
__KERNEL_RCSID(0, "$NetBSD: g760a.c,v 1.6 2020/11/26 12:53:03 skrll Exp $");
#include <sys/param.h>
#include <sys/systm.h>
#include <sys/device.h>
#include <sys/kernel.h>
#include <sys/conf.h>
#include <sys/sysctl.h>
#include <dev/sysmon/sysmonvar.h>
#include <dev/i2c/i2cvar.h>
#include <dev/i2c/g760areg.h>
struct g760a_softc {
device_t sc_dev;
struct sysmon_envsys *sc_sme;
envsys_data_t sc_sensor;
i2c_tag_t sc_tag;
int sc_addr;
};
static int g760a_match(device_t, struct cfdata*, void*);
static void g760a_attach(device_t, device_t, void*);
static void g760a_setup(struct g760a_softc*);
static uint8_t g760a_readreg(struct g760a_softc*, uint8_t);
static void g760a_writereg(struct g760a_softc*, uint8_t, uint8_t);
static int g760a_reg2rpm(int);
static void g760a_refresh(struct sysmon_envsys*, envsys_data_t*);
static int sysctl_g760a_rpm(SYSCTLFN_PROTO);
CFATTACH_DECL_NEW(g760a, sizeof(struct g760a_softc),
g760a_match, g760a_attach, NULL, NULL);
static int
g760a_match(device_t parent, struct cfdata* cf, void* arg)
{
struct i2c_attach_args* ia = arg;
if (ia->ia_addr == G760A_ADDR) {
/*
* TODO: set up minimal speed?
*/
return I2C_MATCH_ADDRESS_ONLY;
}
return 0;
}
static void
g760a_attach(device_t parent, device_t self, void* arg)
{
struct i2c_attach_args* ia = arg;
struct g760a_softc* sc = device_private(self);
aprint_normal(": G760A Fan Controller\n");
sc->sc_dev = self;
sc->sc_tag = ia->ia_tag;
sc->sc_addr = ia->ia_addr;
g760a_setup(sc);
}
static int
g760a_reg2rpm(int n)
{
if(n == 255)
return 0;
if(n == 0)
return 255;
return G760A_N2RPM(n);
}
static uint8_t
g760a_readreg(struct g760a_softc* sc, uint8_t reg)
{
uint8_t data;
if (iic_acquire_bus(sc->sc_tag, 0)) {
aprint_error_dev(sc->sc_dev, "unable to acquire the iic bus\n");
return 0;
}
iic_exec(sc->sc_tag, I2C_OP_READ_WITH_STOP, sc->sc_addr, ®, 1,
&data, 1, 0);
iic_release_bus(sc->sc_tag, 0);
return data;
}
static void
g760a_writereg(struct g760a_softc* sc, uint8_t reg, uint8_t data)
{
if (iic_acquire_bus(sc->sc_tag, 0)) {
aprint_error_dev(sc->sc_dev, "unable to acquire the iic bus\n");
return;
}
iic_exec(sc->sc_tag, I2C_OP_WRITE_WITH_STOP, sc->sc_addr, ®, 1,
&data, 1, 0);
iic_release_bus(sc->sc_tag, 0);
}
SYSCTL_SETUP(sysctl_g760a_setup, "sysctl g760a subtree setup")
{
sysctl_createv(NULL, 0, NULL, NULL,
CTLFLAG_PERMANENT,
CTLTYPE_NODE, "machdep", NULL,
NULL, 0, NULL, 0,
CTL_MACHDEP, CTL_EOL);
}
/*ARGUSED*/
static int
sysctl_g760a_rpm(SYSCTLFN_ARGS)
{
int error, t;
struct sysctlnode node;
struct g760a_softc* sc;
node = *rnode;
sc = node.sysctl_data;
t = g760a_readreg(sc, G760A_REG_SET_CNT);
t = g760a_reg2rpm(t);
node.sysctl_data = &t;
error = sysctl_lookup(SYSCTLFN_CALL(&node));
if (error || newp == NULL)
return error;
if (t > 20000 || t < G760A_N2RPM(254))
return EINVAL;
t = g760a_reg2rpm(t);
g760a_writereg(sc, G760A_REG_SET_CNT, t);
return 0;
}
static void
g760a_refresh(struct sysmon_envsys* sme, envsys_data_t* edata)
{
struct g760a_softc* sc = sme->sme_cookie;
switch (edata->units) {
case ENVSYS_SFANRPM:
{
uint8_t n;
n = g760a_readreg(sc, G760A_REG_ACT_CNT);
edata->value_cur = g760a_reg2rpm(n);
}
break;
default:
aprint_error_dev(sc->sc_dev, "oops\n");
}
edata->state = ENVSYS_SVALID;
}
static void
g760a_setup(struct g760a_softc* sc)
{
int error;
int ret;
const struct sysctlnode *me, *node;
sc->sc_sme = sysmon_envsys_create();
ret = sysctl_createv(NULL, 0, NULL, &me,
CTLFLAG_READWRITE,
CTLTYPE_NODE, device_xname(sc->sc_dev), NULL,
NULL, 0, NULL, 0,
CTL_MACHDEP, CTL_CREATE, CTL_EOL);
if (ret)
goto sysctl_failed;
(void)strlcpy(sc->sc_sensor.desc, "sysfan rpm",
sizeof(sc->sc_sensor.desc));
sc->sc_sensor.units = ENVSYS_SFANRPM;
sc->sc_sensor.state = ENVSYS_SINVALID;
if (sysmon_envsys_sensor_attach(sc->sc_sme, &sc->sc_sensor))
goto out;
ret = sysctl_createv(NULL, 0, NULL, &node,
CTLFLAG_READWRITE,
CTLTYPE_INT, "rpm", sc->sc_sensor.desc,
sysctl_g760a_rpm, 0x42, (void*)sc, 0,
CTL_MACHDEP, me->sysctl_num, CTL_CREATE, CTL_EOL);
if (ret)
goto sysctl_failed;
sc->sc_sme->sme_name = device_xname(sc->sc_dev);
sc->sc_sme->sme_cookie = sc;
sc->sc_sme->sme_refresh = g760a_refresh;
error = sysmon_envsys_register(sc->sc_sme);
if (error) {
aprint_error_dev(sc->sc_dev,
"unable to register with sysmon. errorcode %i\n", error);
goto out;
}
return;
sysctl_failed:
aprint_error_dev(sc->sc_dev,
"couldn't create sysctl nodes (%d)\n", ret);
out:
sysmon_envsys_destroy(sc->sc_sme);
}