14be64618e
for this sensor. Instead of leaving this location empty we use here the default name 'sensor'. Submitted by: Justin Hibbits <chmeeedalf at gmail dot com> Approved by: nwhitehorn (mentor)
262 lines
6.3 KiB
C
262 lines
6.3 KiB
C
/*-
|
|
* 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/reboot.h>
|
|
#include <sys/rman.h>
|
|
#include <sys/sysctl.h>
|
|
#include <sys/limits.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>
|
|
|
|
#define FCU_ZERO_C_TO_K 2732
|
|
|
|
/* Drivebay sensor: LM75/DS1775. */
|
|
#define DS1775_TEMP 0x0
|
|
|
|
struct ds1775_sensor {
|
|
char location[32];
|
|
};
|
|
|
|
/* Regular bus attachment functions */
|
|
static int ds1775_probe(device_t);
|
|
static int ds1775_attach(device_t);
|
|
|
|
/* Utility functions */
|
|
static int ds1775_sensor_sysctl(SYSCTL_HANDLER_ARGS);
|
|
static void ds1775_start(void *xdev);
|
|
static int ds1775_read_2(device_t dev, uint32_t addr, uint8_t reg,
|
|
uint16_t *data);
|
|
|
|
struct ds1775_softc {
|
|
device_t sc_dev;
|
|
struct intr_config_hook enum_hook;
|
|
uint32_t sc_addr;
|
|
struct ds1775_sensor *sc_sensors;
|
|
|
|
};
|
|
static device_method_t ds1775_methods[] = {
|
|
/* Device interface */
|
|
DEVMETHOD(device_probe, ds1775_probe),
|
|
DEVMETHOD(device_attach, ds1775_attach),
|
|
{ 0, 0 },
|
|
};
|
|
|
|
static driver_t ds1775_driver = {
|
|
"ds1775",
|
|
ds1775_methods,
|
|
sizeof(struct ds1775_softc)
|
|
};
|
|
|
|
static devclass_t ds1775_devclass;
|
|
|
|
DRIVER_MODULE(ds1755, iicbus, ds1775_driver, ds1775_devclass, 0, 0);
|
|
MALLOC_DEFINE(M_DS1775, "ds1775", "Temp-Monitor DS1775");
|
|
|
|
static int
|
|
ds1775_read_2(device_t dev, uint32_t addr, uint8_t reg, uint16_t *data)
|
|
{
|
|
uint8_t buf[4];
|
|
|
|
struct iic_msg msg[2] = {
|
|
{ addr, IIC_M_WR | IIC_M_NOSTOP, 1, ® },
|
|
{ addr, IIC_M_RD, 2, buf },
|
|
};
|
|
|
|
if (iicbus_transfer(dev, msg, 2) != 0) {
|
|
device_printf(dev, "iicbus read failed\n");
|
|
return (EIO);
|
|
}
|
|
|
|
*data = *((uint16_t*)buf);
|
|
|
|
return (0);
|
|
}
|
|
|
|
static int
|
|
ds1775_probe(device_t dev)
|
|
{
|
|
const char *name, *compatible;
|
|
struct ds1775_softc *sc;
|
|
|
|
name = ofw_bus_get_name(dev);
|
|
compatible = ofw_bus_get_compat(dev);
|
|
|
|
if (!name)
|
|
return (ENXIO);
|
|
|
|
if (strcmp(name, "temp-monitor") != 0 ||
|
|
(strcmp(compatible, "ds1775") != 0 &&
|
|
strcmp(compatible, "lm75") != 0))
|
|
return (ENXIO);
|
|
|
|
sc = device_get_softc(dev);
|
|
sc->sc_dev = dev;
|
|
sc->sc_addr = iicbus_get_addr(dev);
|
|
|
|
device_set_desc(dev, "Temp-Monitor DS1775");
|
|
|
|
return (0);
|
|
}
|
|
|
|
static int
|
|
ds1775_attach(device_t dev)
|
|
{
|
|
struct ds1775_softc *sc;
|
|
|
|
sc = device_get_softc(dev);
|
|
|
|
sc->enum_hook.ich_func = ds1775_start;
|
|
sc->enum_hook.ich_arg = dev;
|
|
|
|
/* We have to wait until interrupts are enabled. I2C read and write
|
|
* only works if the interrupts are available.
|
|
* The unin/i2c is controlled by the htpic on unin. But this is not
|
|
* the master. The openpic on mac-io is controlling the htpic.
|
|
* This one gets attached after the mac-io probing and then the
|
|
* interrupts will be available.
|
|
*/
|
|
|
|
if (config_intrhook_establish(&sc->enum_hook) != 0)
|
|
return (ENOMEM);
|
|
|
|
return (0);
|
|
}
|
|
|
|
static void
|
|
ds1775_start(void *xdev)
|
|
{
|
|
phandle_t child;
|
|
struct ds1775_softc *sc;
|
|
struct ds1775_sensor *sens;
|
|
struct sysctl_oid *sensroot_oid;
|
|
struct sysctl_ctx_list *ctx;
|
|
ssize_t plen;
|
|
int i;
|
|
char sysctl_name[40], sysctl_desc[40];
|
|
const char *units;
|
|
|
|
device_t dev = (device_t)xdev;
|
|
|
|
sc = device_get_softc(dev);
|
|
|
|
child = ofw_bus_get_node(dev);
|
|
|
|
sc->sc_sensors = malloc (sizeof(struct ds1775_sensor),
|
|
M_DS1775, M_WAITOK | M_ZERO);
|
|
|
|
sens = sc->sc_sensors;
|
|
|
|
ctx = device_get_sysctl_ctx(dev);
|
|
sensroot_oid = device_get_sysctl_tree(dev);
|
|
|
|
plen = OF_getprop(child, "hwsensor-location", sens->location,
|
|
sizeof(sens->location));
|
|
units = "C";
|
|
|
|
if (plen == -1) {
|
|
strcpy(sysctl_name, "sensor");
|
|
} else {
|
|
for (i = 0; i < strlen(sens->location); i++) {
|
|
sysctl_name[i] = tolower(sens->location[i]);
|
|
if (isspace(sysctl_name[i]))
|
|
sysctl_name[i] = '_';
|
|
}
|
|
sysctl_name[i] = 0;
|
|
}
|
|
|
|
sprintf(sysctl_desc,"%s (%s)", sens->location, units);
|
|
SYSCTL_ADD_PROC(ctx, SYSCTL_CHILDREN(sensroot_oid), OID_AUTO,
|
|
sysctl_name,
|
|
CTLTYPE_INT | CTLFLAG_RD | CTLFLAG_MPSAFE, dev,
|
|
0, ds1775_sensor_sysctl, "IK", sysctl_desc);
|
|
|
|
config_intrhook_disestablish(&sc->enum_hook);
|
|
}
|
|
|
|
static int
|
|
ds1775_sensor_read(device_t dev, struct ds1775_sensor *sens, int *temp)
|
|
{
|
|
struct ds1775_softc *sc;
|
|
uint16_t buf[2];
|
|
uint16_t read;
|
|
|
|
sc = device_get_softc(dev);
|
|
|
|
ds1775_read_2(sc->sc_dev, sc->sc_addr, DS1775_TEMP, buf);
|
|
|
|
read = *((int16_t *)buf);
|
|
|
|
/* The default mode of the ADC is 9 bit, the resolution is 0.5 C per
|
|
bit. The temperature is in tenth kelvin.
|
|
*/
|
|
*temp = ((int16_t)(read) >> 7) * 5;
|
|
|
|
return (0);
|
|
}
|
|
static int
|
|
ds1775_sensor_sysctl(SYSCTL_HANDLER_ARGS)
|
|
{
|
|
device_t dev;
|
|
struct ds1775_softc *sc;
|
|
struct ds1775_sensor *sens;
|
|
int value;
|
|
int error;
|
|
unsigned int temp;
|
|
|
|
dev = arg1;
|
|
sc = device_get_softc(dev);
|
|
sens = &sc->sc_sensors[arg2];
|
|
|
|
error = ds1775_sensor_read(dev, sens, &value);
|
|
if (error != 0)
|
|
return (error);
|
|
|
|
temp = value + FCU_ZERO_C_TO_K;
|
|
|
|
error = sysctl_handle_int(oidp, &temp, 0, req);
|
|
|
|
return (error);
|
|
}
|