91e38bd663
Set all the sysctls as CTLFLAG_MPSAFE.
581 lines
13 KiB
C
581 lines
13 KiB
C
/*-
|
|
* Copyright (c) 2010 Andreas Tobler.
|
|
* Copyright (c) 2013-2014 Luiz Otavio O Souza <loos@freebsd.org>
|
|
* 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 "opt_platform.h"
|
|
|
|
#include <sys/param.h>
|
|
#include <sys/bus.h>
|
|
#include <sys/endian.h>
|
|
#include <sys/kernel.h>
|
|
#include <sys/module.h>
|
|
#include <sys/sysctl.h>
|
|
#include <sys/systm.h>
|
|
|
|
#include <machine/bus.h>
|
|
|
|
#include <dev/iicbus/iicbus.h>
|
|
#include <dev/iicbus/iiconf.h>
|
|
|
|
#ifdef FDT
|
|
#include <dev/ofw/openfirm.h>
|
|
#include <dev/ofw/ofw_bus.h>
|
|
#include <dev/ofw/ofw_bus_subr.h>
|
|
#endif
|
|
|
|
/* LM75 registers. */
|
|
#define LM75_TEMP 0x0
|
|
#define LM75_TEMP_MASK 0xff80
|
|
#define LM75A_TEMP_MASK 0xffe0
|
|
#define LM75_CONF 0x1
|
|
#define LM75_CONF_FSHIFT 3
|
|
#define LM75_CONF_FAULT 0x18
|
|
#define LM75_CONF_POL 0x04
|
|
#define LM75_CONF_MODE 0x02
|
|
#define LM75_CONF_SHUTD 0x01
|
|
#define LM75_CONF_MASK 0x1f
|
|
#define LM75_THYST 0x2
|
|
#define LM75_TOS 0x3
|
|
|
|
/* LM75 constants. */
|
|
#define LM75_TEST_PATTERN 0xa
|
|
#define LM75_MIN_TEMP -55
|
|
#define LM75_MAX_TEMP 125
|
|
#define LM75_0500C 0x80
|
|
#define LM75_0250C 0x40
|
|
#define LM75_0125C 0x20
|
|
#define LM75_MSB 0x8000
|
|
#define LM75_NEG_BIT LM75_MSB
|
|
#define TZ_ZEROC 2732
|
|
|
|
/* LM75 supported models. */
|
|
#define HWTYPE_LM75 1
|
|
#define HWTYPE_LM75A 2
|
|
|
|
/* Regular bus attachment functions */
|
|
static int lm75_probe(device_t);
|
|
static int lm75_attach(device_t);
|
|
|
|
struct lm75_softc {
|
|
device_t sc_dev;
|
|
struct intr_config_hook enum_hook;
|
|
int32_t sc_hwtype;
|
|
uint32_t sc_addr;
|
|
uint32_t sc_conf;
|
|
};
|
|
|
|
static int lm75_faults[4] = { 1, 2, 4, 6 };
|
|
|
|
/* Utility functions */
|
|
static int lm75_conf_read(struct lm75_softc *);
|
|
static int lm75_conf_write(struct lm75_softc *);
|
|
static int lm75_temp_read(struct lm75_softc *, uint8_t, int *);
|
|
static int lm75_temp_write(struct lm75_softc *, uint8_t, int);
|
|
static void lm75_start(void *);
|
|
static int lm75_read(device_t, uint32_t, uint8_t, uint8_t *, size_t);
|
|
static int lm75_write(device_t, uint32_t, uint8_t *, size_t);
|
|
static int lm75_str_mode(char *);
|
|
static int lm75_str_pol(char *);
|
|
static int lm75_temp_sysctl(SYSCTL_HANDLER_ARGS);
|
|
static int lm75_faults_sysctl(SYSCTL_HANDLER_ARGS);
|
|
static int lm75_mode_sysctl(SYSCTL_HANDLER_ARGS);
|
|
static int lm75_pol_sysctl(SYSCTL_HANDLER_ARGS);
|
|
static int lm75_shutdown_sysctl(SYSCTL_HANDLER_ARGS);
|
|
|
|
static device_method_t lm75_methods[] = {
|
|
/* Device interface */
|
|
DEVMETHOD(device_probe, lm75_probe),
|
|
DEVMETHOD(device_attach, lm75_attach),
|
|
|
|
DEVMETHOD_END
|
|
};
|
|
|
|
static driver_t lm75_driver = {
|
|
"lm75",
|
|
lm75_methods,
|
|
sizeof(struct lm75_softc)
|
|
};
|
|
|
|
static devclass_t lm75_devclass;
|
|
|
|
DRIVER_MODULE(lm75, iicbus, lm75_driver, lm75_devclass, 0, 0);
|
|
|
|
static int
|
|
lm75_read(device_t dev, uint32_t addr, uint8_t reg, uint8_t *data, size_t len)
|
|
{
|
|
struct iic_msg msg[2] = {
|
|
{ addr, IIC_M_WR | IIC_M_NOSTOP, 1, ® },
|
|
{ addr, IIC_M_RD, len, data },
|
|
};
|
|
|
|
if (iicbus_transfer(dev, msg, nitems(msg)) != 0)
|
|
return (-1);
|
|
|
|
return (0);
|
|
}
|
|
|
|
static int
|
|
lm75_write(device_t dev, uint32_t addr, uint8_t *data, size_t len)
|
|
{
|
|
struct iic_msg msg[1] = {
|
|
{ addr, IIC_M_WR, len, data },
|
|
};
|
|
|
|
if (iicbus_transfer(dev, msg, nitems(msg)) != 0)
|
|
return (-1);
|
|
|
|
return (0);
|
|
}
|
|
|
|
static int
|
|
lm75_probe(device_t dev)
|
|
{
|
|
struct lm75_softc *sc;
|
|
|
|
sc = device_get_softc(dev);
|
|
sc->sc_hwtype = HWTYPE_LM75;
|
|
#ifdef FDT
|
|
if (!ofw_bus_is_compatible(dev, "national,lm75"))
|
|
return (ENXIO);
|
|
#endif
|
|
device_set_desc(dev, "LM75 temperature sensor");
|
|
|
|
return (BUS_PROBE_GENERIC);
|
|
}
|
|
|
|
static int
|
|
lm75_attach(device_t dev)
|
|
{
|
|
struct lm75_softc *sc;
|
|
|
|
sc = device_get_softc(dev);
|
|
sc->sc_dev = dev;
|
|
sc->sc_addr = iicbus_get_addr(dev);
|
|
|
|
sc->enum_hook.ich_func = lm75_start;
|
|
sc->enum_hook.ich_arg = dev;
|
|
|
|
/*
|
|
* We have to wait until interrupts are enabled. Usually I2C read
|
|
* and write only works when the interrupts are available.
|
|
*/
|
|
if (config_intrhook_establish(&sc->enum_hook) != 0)
|
|
return (ENOMEM);
|
|
|
|
return (0);
|
|
}
|
|
|
|
static int
|
|
lm75_type_detect(struct lm75_softc *sc)
|
|
{
|
|
int i, lm75a;
|
|
uint8_t buf8;
|
|
uint32_t conf;
|
|
|
|
/* Save the contents of the configuration register. */
|
|
if (lm75_conf_read(sc) != 0)
|
|
return (-1);
|
|
conf = sc->sc_conf;
|
|
|
|
/*
|
|
* Just write some pattern at configuration register so we can later
|
|
* verify. The test pattern should be pretty harmless.
|
|
*/
|
|
sc->sc_conf = LM75_TEST_PATTERN;
|
|
if (lm75_conf_write(sc) != 0)
|
|
return (-1);
|
|
|
|
/*
|
|
* Read the configuration register again and check for our test
|
|
* pattern.
|
|
*/
|
|
if (lm75_conf_read(sc) != 0)
|
|
return (-1);
|
|
if (sc->sc_conf != LM75_TEST_PATTERN)
|
|
return (-1);
|
|
|
|
/*
|
|
* Read from nonexistent registers (0x4 ~ 0x6).
|
|
* LM75A always return 0xff for nonexistent registers.
|
|
* LM75 will return the last read value - our test pattern written to
|
|
* configuration register.
|
|
*/
|
|
lm75a = 0;
|
|
for (i = 4; i <= 6; i++) {
|
|
if (lm75_read(sc->sc_dev, sc->sc_addr, i,
|
|
&buf8, sizeof(buf8)) < 0)
|
|
return (-1);
|
|
if (buf8 != LM75_TEST_PATTERN && buf8 != 0xff)
|
|
return (-1);
|
|
if (buf8 == 0xff)
|
|
lm75a++;
|
|
}
|
|
if (lm75a == 3)
|
|
sc->sc_hwtype = HWTYPE_LM75A;
|
|
|
|
/* Restore the configuration register. */
|
|
sc->sc_conf = conf;
|
|
if (lm75_conf_write(sc) != 0)
|
|
return (-1);
|
|
|
|
return (0);
|
|
}
|
|
|
|
static void
|
|
lm75_start(void *xdev)
|
|
{
|
|
device_t dev;
|
|
struct lm75_softc *sc;
|
|
struct sysctl_ctx_list *ctx;
|
|
struct sysctl_oid *tree_node;
|
|
struct sysctl_oid_list *tree;
|
|
|
|
dev = (device_t)xdev;
|
|
sc = device_get_softc(dev);
|
|
ctx = device_get_sysctl_ctx(dev);
|
|
tree_node = device_get_sysctl_tree(dev);
|
|
tree = SYSCTL_CHILDREN(tree_node);
|
|
|
|
config_intrhook_disestablish(&sc->enum_hook);
|
|
|
|
/*
|
|
* Detect the kind of chip we are attaching to.
|
|
* This may not work for LM75 clones.
|
|
*/
|
|
if (lm75_type_detect(sc) != 0) {
|
|
device_printf(dev, "cannot read from sensor.\n");
|
|
return;
|
|
}
|
|
if (sc->sc_hwtype == HWTYPE_LM75A)
|
|
device_printf(dev,
|
|
"LM75A type sensor detected (11bits resolution).\n");
|
|
|
|
/* Temperature. */
|
|
SYSCTL_ADD_PROC(ctx, tree, OID_AUTO, "temperature",
|
|
CTLTYPE_INT | CTLFLAG_RD | CTLFLAG_MPSAFE, dev, LM75_TEMP,
|
|
lm75_temp_sysctl, "IK", "Current temperature");
|
|
SYSCTL_ADD_PROC(ctx, tree, OID_AUTO, "thyst",
|
|
CTLTYPE_INT | CTLFLAG_RW | CTLFLAG_MPSAFE, dev, LM75_THYST,
|
|
lm75_temp_sysctl, "IK", "Hysteresis temperature");
|
|
SYSCTL_ADD_PROC(ctx, tree, OID_AUTO, "tos",
|
|
CTLTYPE_INT | CTLFLAG_RW | CTLFLAG_MPSAFE, dev, LM75_TOS,
|
|
lm75_temp_sysctl, "IK", "Overtemperature");
|
|
|
|
/* Configuration parameters. */
|
|
SYSCTL_ADD_PROC(ctx, tree, OID_AUTO, "faults",
|
|
CTLFLAG_RW | CTLTYPE_UINT | CTLFLAG_MPSAFE, dev, 0,
|
|
lm75_faults_sysctl, "IU", "LM75 fault queue");
|
|
SYSCTL_ADD_PROC(ctx, tree, OID_AUTO, "mode",
|
|
CTLFLAG_RW | CTLTYPE_STRING | CTLFLAG_MPSAFE, dev, 0,
|
|
lm75_mode_sysctl, "A", "LM75 mode");
|
|
SYSCTL_ADD_PROC(ctx, tree, OID_AUTO, "polarity",
|
|
CTLFLAG_RW | CTLTYPE_STRING | CTLFLAG_MPSAFE, dev, 0,
|
|
lm75_pol_sysctl, "A", "LM75 OS polarity");
|
|
SYSCTL_ADD_PROC(ctx, tree, OID_AUTO, "shutdown",
|
|
CTLFLAG_RW | CTLTYPE_UINT | CTLFLAG_MPSAFE, dev, 0,
|
|
lm75_shutdown_sysctl, "IU", "LM75 shutdown");
|
|
}
|
|
|
|
static int
|
|
lm75_conf_read(struct lm75_softc *sc)
|
|
{
|
|
uint8_t buf8;
|
|
|
|
if (lm75_read(sc->sc_dev, sc->sc_addr, LM75_CONF,
|
|
&buf8, sizeof(buf8)) < 0)
|
|
return (-1);
|
|
sc->sc_conf = (uint32_t)buf8;
|
|
|
|
return (0);
|
|
}
|
|
|
|
static int
|
|
lm75_conf_write(struct lm75_softc *sc)
|
|
{
|
|
uint8_t buf8[2];
|
|
|
|
buf8[0] = LM75_CONF;
|
|
buf8[1] = (uint8_t)sc->sc_conf & LM75_CONF_MASK;
|
|
if (lm75_write(sc->sc_dev, sc->sc_addr, buf8, sizeof(buf8)) < 0)
|
|
return (-1);
|
|
|
|
return (0);
|
|
}
|
|
|
|
static int
|
|
lm75_temp_read(struct lm75_softc *sc, uint8_t reg, int *temp)
|
|
{
|
|
uint8_t buf8[2];
|
|
uint16_t buf;
|
|
int neg, t;
|
|
|
|
if (lm75_read(sc->sc_dev, sc->sc_addr, reg, buf8, sizeof(buf8)) < 0)
|
|
return (-1);
|
|
buf = (uint16_t)((buf8[0] << 8) | (buf8[1] & 0xff));
|
|
/*
|
|
* LM75 has a 9 bit ADC with resolution of 0.5 C per bit.
|
|
* LM75A has an 11 bit ADC with resolution of 0.125 C per bit.
|
|
* Temperature is stored with two's complement.
|
|
*/
|
|
neg = 0;
|
|
if (buf & LM75_NEG_BIT) {
|
|
if (sc->sc_hwtype == HWTYPE_LM75A)
|
|
buf = ~(buf & LM75A_TEMP_MASK) + 1;
|
|
else
|
|
buf = ~(buf & LM75_TEMP_MASK) + 1;
|
|
neg = 1;
|
|
}
|
|
*temp = ((int16_t)buf >> 8) * 10;
|
|
t = 0;
|
|
if (sc->sc_hwtype == HWTYPE_LM75A) {
|
|
if (buf & LM75_0125C)
|
|
t += 125;
|
|
if (buf & LM75_0250C)
|
|
t += 250;
|
|
}
|
|
if (buf & LM75_0500C)
|
|
t += 500;
|
|
t /= 100;
|
|
*temp += t;
|
|
if (neg)
|
|
*temp = -(*temp);
|
|
*temp += TZ_ZEROC;
|
|
|
|
return (0);
|
|
}
|
|
|
|
static int
|
|
lm75_temp_write(struct lm75_softc *sc, uint8_t reg, int temp)
|
|
{
|
|
uint8_t buf8[3];
|
|
uint16_t buf;
|
|
|
|
temp = (temp - TZ_ZEROC) / 10;
|
|
if (temp > LM75_MAX_TEMP)
|
|
temp = LM75_MAX_TEMP;
|
|
if (temp < LM75_MIN_TEMP)
|
|
temp = LM75_MIN_TEMP;
|
|
|
|
buf = (uint16_t)temp;
|
|
buf <<= 8;
|
|
|
|
buf8[0] = reg;
|
|
buf8[1] = buf >> 8;
|
|
buf8[2] = buf & 0xff;
|
|
if (lm75_write(sc->sc_dev, sc->sc_addr, buf8, sizeof(buf8)) < 0)
|
|
return (-1);
|
|
|
|
return (0);
|
|
}
|
|
|
|
static int
|
|
lm75_str_mode(char *buf)
|
|
{
|
|
int len, rtrn;
|
|
|
|
rtrn = -1;
|
|
len = strlen(buf);
|
|
if (len > 2 && strncasecmp("interrupt", buf, len) == 0)
|
|
rtrn = 1;
|
|
else if (len > 2 && strncasecmp("comparator", buf, len) == 0)
|
|
rtrn = 0;
|
|
|
|
return (rtrn);
|
|
}
|
|
|
|
static int
|
|
lm75_str_pol(char *buf)
|
|
{
|
|
int len, rtrn;
|
|
|
|
rtrn = -1;
|
|
len = strlen(buf);
|
|
if (len > 1 && strncasecmp("high", buf, len) == 0)
|
|
rtrn = 1;
|
|
else if (len > 1 && strncasecmp("low", buf, len) == 0)
|
|
rtrn = 0;
|
|
else if (len > 8 && strncasecmp("active-high", buf, len) == 0)
|
|
rtrn = 1;
|
|
else if (len > 8 && strncasecmp("active-low", buf, len) == 0)
|
|
rtrn = 0;
|
|
|
|
return (rtrn);
|
|
}
|
|
|
|
static int
|
|
lm75_temp_sysctl(SYSCTL_HANDLER_ARGS)
|
|
{
|
|
device_t dev;
|
|
int error, temp;
|
|
struct lm75_softc *sc;
|
|
uint8_t reg;
|
|
|
|
dev = (device_t)arg1;
|
|
reg = (uint8_t)arg2;
|
|
sc = device_get_softc(dev);
|
|
|
|
if (lm75_temp_read(sc, reg, &temp) != 0)
|
|
return (EIO);
|
|
|
|
error = sysctl_handle_int(oidp, &temp, 0, req);
|
|
if (error != 0 || req->newptr == NULL)
|
|
return (error);
|
|
|
|
if (lm75_temp_write(sc, reg, temp) != 0)
|
|
return (EIO);
|
|
|
|
return (error);
|
|
}
|
|
|
|
static int
|
|
lm75_faults_sysctl(SYSCTL_HANDLER_ARGS)
|
|
{
|
|
device_t dev;
|
|
int error, faults, i, newf, tmp;
|
|
struct lm75_softc *sc;
|
|
|
|
dev = (device_t)arg1;
|
|
sc = device_get_softc(dev);
|
|
tmp = (sc->sc_conf & LM75_CONF_FAULT) >> LM75_CONF_FSHIFT;
|
|
if (tmp > nitems(lm75_faults))
|
|
tmp = nitems(lm75_faults);
|
|
faults = lm75_faults[tmp];
|
|
|
|
error = sysctl_handle_int(oidp, &faults, 0, req);
|
|
if (error != 0 || req->newptr == NULL)
|
|
return (error);
|
|
|
|
if (faults != lm75_faults[tmp]) {
|
|
newf = 0;
|
|
for (i = 0; i < nitems(lm75_faults); i++)
|
|
if (faults >= lm75_faults[i])
|
|
newf = i;
|
|
sc->sc_conf &= ~LM75_CONF_FAULT;
|
|
sc->sc_conf |= newf << LM75_CONF_FSHIFT;
|
|
if (lm75_conf_write(sc) != 0)
|
|
return (EIO);
|
|
}
|
|
|
|
return (error);
|
|
}
|
|
|
|
static int
|
|
lm75_mode_sysctl(SYSCTL_HANDLER_ARGS)
|
|
{
|
|
char buf[16];
|
|
device_t dev;
|
|
int error, mode, newm;
|
|
struct lm75_softc *sc;
|
|
|
|
dev = (device_t)arg1;
|
|
sc = device_get_softc(dev);
|
|
if (sc->sc_conf & LM75_CONF_MODE) {
|
|
mode = 1;
|
|
strlcpy(buf, "interrupt", sizeof(buf));
|
|
} else {
|
|
mode = 0;
|
|
strlcpy(buf, "comparator", sizeof(buf));
|
|
}
|
|
|
|
error = sysctl_handle_string(oidp, buf, sizeof(buf), req);
|
|
if (error != 0 || req->newptr == NULL)
|
|
return (error);
|
|
|
|
newm = lm75_str_mode(buf);
|
|
if (newm != -1 && mode != newm) {
|
|
sc->sc_conf &= ~LM75_CONF_MODE;
|
|
if (newm == 1)
|
|
sc->sc_conf |= LM75_CONF_MODE;
|
|
if (lm75_conf_write(sc) != 0)
|
|
return (EIO);
|
|
}
|
|
|
|
return (error);
|
|
}
|
|
|
|
static int
|
|
lm75_pol_sysctl(SYSCTL_HANDLER_ARGS)
|
|
{
|
|
char buf[16];
|
|
device_t dev;
|
|
int error, newp, pol;
|
|
struct lm75_softc *sc;
|
|
|
|
dev = (device_t)arg1;
|
|
sc = device_get_softc(dev);
|
|
if (sc->sc_conf & LM75_CONF_POL) {
|
|
pol = 1;
|
|
strlcpy(buf, "active-high", sizeof(buf));
|
|
} else {
|
|
pol = 0;
|
|
strlcpy(buf, "active-low", sizeof(buf));
|
|
}
|
|
|
|
error = sysctl_handle_string(oidp, buf, sizeof(buf), req);
|
|
if (error != 0 || req->newptr == NULL)
|
|
return (error);
|
|
|
|
newp = lm75_str_pol(buf);
|
|
if (newp != -1 && pol != newp) {
|
|
sc->sc_conf &= ~LM75_CONF_POL;
|
|
if (newp == 1)
|
|
sc->sc_conf |= LM75_CONF_POL;
|
|
if (lm75_conf_write(sc) != 0)
|
|
return (EIO);
|
|
}
|
|
|
|
return (error);
|
|
}
|
|
|
|
static int
|
|
lm75_shutdown_sysctl(SYSCTL_HANDLER_ARGS)
|
|
{
|
|
device_t dev;
|
|
int error, shutdown, tmp;
|
|
struct lm75_softc *sc;
|
|
|
|
dev = (device_t)arg1;
|
|
sc = device_get_softc(dev);
|
|
tmp = shutdown = (sc->sc_conf & LM75_CONF_SHUTD) ? 1 : 0;
|
|
|
|
error = sysctl_handle_int(oidp, &shutdown, 0, req);
|
|
if (error != 0 || req->newptr == NULL)
|
|
return (error);
|
|
|
|
if (shutdown != tmp) {
|
|
sc->sc_conf &= ~LM75_CONF_SHUTD;
|
|
if (shutdown)
|
|
sc->sc_conf |= LM75_CONF_SHUTD;
|
|
if (lm75_conf_write(sc) != 0)
|
|
return (EIO);
|
|
}
|
|
|
|
return (error);
|
|
}
|