freebsd-dev/sys/dev/iicbus/ds1631.c
Justin Hibbits e17bec9172 Make more unsigned ints signed.
Found by:	clang (powerpc64)
MFC after:	1 week
2013-12-07 22:25:07 +00:00

414 lines
9.7 KiB
C

/*-
* Copyright (c) 2012 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>
#include <powerpc/powermac/powermac_thermal.h>
/* Sensor: Maxim DS1631 */
#define DS1631_STOP 0x22
#define DS1631_START 0x51
#define DS1631_RESET 0x54
#define DS1631_TEMP 0xAA
#define DS1631_CONTROL 0xAC
#define DS1631_CONTROL_1SHOT 0x01
#define DS1631_CONTROL_9BIT 0x00
#define DS1631_CONTROL_10BIT 0x04
#define DS1631_CONTROL_11BIT 0x08
#define DS1631_CONTROL_12BIT 0x0C
/* Regular bus attachment functions */
static int ds1631_probe(device_t);
static int ds1631_attach(device_t);
struct ds1631_softc {
struct pmac_therm sc_sensor;
device_t sc_dev;
struct intr_config_hook enum_hook;
uint32_t sc_addr;
uint32_t init_done;
};
struct write_data {
uint8_t reg;
uint8_t val;
};
struct read_data {
uint8_t reg;
uint16_t val;
};
/* Utility functions */
static int ds1631_sensor_read(struct ds1631_softc *sc);
static int ds1631_sensor_sysctl(SYSCTL_HANDLER_ARGS);
static void ds1631_start(void *xdev);
static int ds1631_read_1(device_t dev, uint32_t addr, uint8_t reg,
uint8_t *data);
static int ds1631_read_2(device_t dev, uint32_t addr, uint8_t reg,
uint16_t *data);
static int ds1631_write(device_t dev, uint32_t addr, uint8_t reg,
uint8_t *buff, int len);
static device_method_t ds1631_methods[] = {
/* Device interface */
DEVMETHOD(device_probe, ds1631_probe),
DEVMETHOD(device_attach, ds1631_attach),
{ 0, 0 },
};
static driver_t ds1631_driver = {
"ds1631",
ds1631_methods,
sizeof(struct ds1631_softc)
};
static devclass_t ds1631_devclass;
DRIVER_MODULE(ds1631, iicbus, ds1631_driver, ds1631_devclass, 0, 0);
static int
ds1631_write(device_t dev, uint32_t addr, uint8_t reg, uint8_t *buff, int len)
{
uint8_t buf[4];
int try = 0;
struct iic_msg msg[] = {
{ addr, IIC_M_WR, 0, buf }
};
/* Prepare the write msg. */
msg[0].len = len + 1;
buf[0] = reg;
memcpy(buf + 1, buff, len);
for (;;)
{
if (iicbus_transfer(dev, msg, 1) == 0)
return (0);
if (++try > 5) {
device_printf(dev, "iicbus write failed\n");
return (-1);
}
pause("ds1631_write", hz);
}
}
static int
ds1631_read_1(device_t dev, uint32_t addr, uint8_t reg, uint8_t *data)
{
uint8_t buf[4];
int err, try = 0;
struct iic_msg msg[2] = {
{ addr, IIC_M_WR, 1, &reg },
{ addr, IIC_M_RD, 1, buf },
};
for (;;)
{
err = iicbus_transfer(dev, msg, 2);
if (err != 0)
goto retry;
*data = *((uint8_t*)buf);
return (0);
retry:
if (++try > 5) {
device_printf(dev, "iicbus read failed\n");
return (-1);
}
pause("ds1631_read_1", hz);
}
}
static int
ds1631_read_2(device_t dev, uint32_t addr, uint8_t reg, uint16_t *data)
{
uint8_t buf[4];
int err, try = 0;
struct iic_msg msg[2] = {
{ addr, IIC_M_WR, 1, &reg },
{ addr, IIC_M_RD, 2, buf },
};
for (;;)
{
err = iicbus_transfer(dev, msg, 2);
if (err != 0)
goto retry;
*data = *((uint16_t*)buf);
return (0);
retry:
if (++try > 5) {
device_printf(dev, "iicbus read failed\n");
return (-1);
}
pause("ds1631_read_2", hz);
}
}
static int
ds1631_probe(device_t dev)
{
const char *name, *compatible;
struct ds1631_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, "ds1631") != 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 DS1631");
return (0);
}
static int
ds1631_attach(device_t dev)
{
struct ds1631_softc *sc;
sc = device_get_softc(dev);
sc->enum_hook.ich_func = ds1631_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 int
ds1631_init(device_t dev, uint32_t addr)
{
uint8_t conf;
int err;
struct ds1631_softc *sc;
sc = device_get_softc(dev);
err = ds1631_read_1(dev, addr, DS1631_CONTROL, &conf);
if (err < 0) {
device_printf(dev, "ds1631 read config failed: %x\n", err);
return (-1);
}
/* Stop the conversion if not in 1SHOT mode. */
if (conf & ~DS1631_CONTROL_1SHOT)
err = ds1631_write(dev, addr, DS1631_STOP, &conf, 0);
/*
* Setup the resolution, 10-bit is enough. Each bit increase in
* resolution doubles the conversion time.
*/
conf = DS1631_CONTROL_10BIT;
err = ds1631_write(dev, addr, DS1631_CONTROL, &conf, 1);
if (err < 0) {
device_printf(dev, "ds1631 write config failed: %x\n", err);
return (-1);
}
/* And now start....*/
err = ds1631_write(dev, addr, DS1631_START, &conf, 0);
if (err < 0) {
device_printf(dev, "ds1631 write start failed: %x\n", err);
return (-1);
}
sc->init_done = 1;
return (0);
}
static void
ds1631_start(void *xdev)
{
phandle_t child, node;
struct ds1631_softc *sc;
struct sysctl_oid *oid, *sensroot_oid;
struct sysctl_ctx_list *ctx;
ssize_t plen;
int i;
char sysctl_desc[40], sysctl_name[40];
device_t dev = (device_t)xdev;
sc = device_get_softc(dev);
child = ofw_bus_get_node(dev);
ctx = device_get_sysctl_ctx(dev);
sensroot_oid = SYSCTL_ADD_NODE(ctx,
SYSCTL_CHILDREN(device_get_sysctl_tree(dev)), OID_AUTO, "sensor",
CTLFLAG_RD, 0, "DS1631 Sensor Information");
if (OF_getprop(child, "hwsensor-zone", &sc->sc_sensor.zone,
sizeof(int)) < 0)
sc->sc_sensor.zone = 0;
plen = OF_getprop(child, "hwsensor-location", sc->sc_sensor.name,
sizeof(sc->sc_sensor.name));
if (plen == -1) {
/*
* Ok, no hwsensor-location property, so let's look for a
* location property on a sub node.
*/
for (node = OF_child(child); node; node = OF_peer(node))
plen = OF_getprop(node, "location", sc->sc_sensor.name,
sizeof(sc->sc_sensor.name));
}
if (plen == -1) {
strcpy(sysctl_name, "sensor");
} else {
for (i = 0; i < strlen(sc->sc_sensor.name); i++) {
sysctl_name[i] = tolower(sc->sc_sensor.name[i]);
if (isspace(sysctl_name[i]))
sysctl_name[i] = '_';
}
sysctl_name[i] = 0;
}
/* Make up target temperatures. These are low, for the drive bay. */
if (sc->sc_sensor.zone == 0) {
sc->sc_sensor.target_temp = 400 + ZERO_C_TO_K;
sc->sc_sensor.max_temp = 500 + ZERO_C_TO_K;
} else {
sc->sc_sensor.target_temp = 300 + ZERO_C_TO_K;
sc->sc_sensor.max_temp = 500 + ZERO_C_TO_K;
}
sc->sc_sensor.read =
(int (*)(struct pmac_therm *sc))(ds1631_sensor_read);
pmac_thermal_sensor_register(&sc->sc_sensor);
sprintf(sysctl_desc,"%s %s", sc->sc_sensor.name, "(C)");
oid = SYSCTL_ADD_NODE(ctx, SYSCTL_CHILDREN(sensroot_oid),
OID_AUTO, sysctl_name, CTLFLAG_RD, 0,
"Sensor Information");
SYSCTL_ADD_PROC(ctx, SYSCTL_CHILDREN(oid), OID_AUTO, "temp",
CTLTYPE_INT | CTLFLAG_RD | CTLFLAG_MPSAFE, dev,
0, ds1631_sensor_sysctl, "IK", sysctl_desc);
config_intrhook_disestablish(&sc->enum_hook);
}
static int
ds1631_sensor_read(struct ds1631_softc *sc)
{
uint16_t buf[2];
uint16_t read;
int err;
if (!sc->init_done)
ds1631_init(sc->sc_dev, sc->sc_addr);
err = ds1631_read_2(sc->sc_dev, sc->sc_addr, DS1631_TEMP, buf);
if (err < 0) {
device_printf(sc->sc_dev, "ds1631 read TEMP failed: %x\n", err);
return (-1);
}
read = *((int16_t *)buf);
/*
* The default mode of the ADC is 12-bit, the resolution is 0.0625 C
* per bit. The temperature is in tenth kelvin.
* We use 10-bit resolution which seems enough, resolution is 0.25 C.
*/
return (((int16_t)(read) >> 6) * 25 / 10 + ZERO_C_TO_K);
}
static int
ds1631_sensor_sysctl(SYSCTL_HANDLER_ARGS)
{
device_t dev;
struct ds1631_softc *sc;
int error;
int temp;
dev = arg1;
sc = device_get_softc(dev);
temp = ds1631_sensor_read(sc);
if (temp < 0)
return (EIO);
error = sysctl_handle_int(oidp, &temp, 0, req);
return (error);
}