freebsd-dev/sys/dev/iicbus/ad7417.c
Pedro F. Giffuni 718cf2ccb9 sys/dev: further adoption of SPDX licensing ID tags.
Mainly focus on files that use BSD 2-Clause license, however the tool I
was using misidentified many licenses so this was mostly a manual - error
prone - task.

The Software Package Data Exchange (SPDX) group provides a specification
to make it easier for automated tools to detect and summarize well known
opensource licenses. We are gradually adopting the specification, noting
that the tags are considered only advisory and do not, in any way,
superceed or replace the license texts.
2017-11-27 14:52:40 +00:00

631 lines
14 KiB
C

/*-
* SPDX-License-Identifier: BSD-2-Clause-FreeBSD
*
* 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>
#include <powerpc/powermac/powermac_thermal.h>
/* CPU A/B sensors, temp and adc: AD7417. */
#define AD7417_TEMP 0x00
#define AD7417_CONFIG 0x01
#define AD7417_ADC 0x04
#define AD7417_CONFIG2 0x05
#define AD7417_CONFMASK 0xe0
uint8_t adc741x_config;
struct ad7417_sensor {
struct pmac_therm therm;
device_t dev;
int id;
enum {
ADC7417_TEMP_SENSOR,
ADC7417_ADC_SENSOR
} type;
};
struct write_data {
uint8_t reg;
uint8_t val;
};
struct read_data {
uint8_t reg;
uint16_t val;
};
/* Regular bus attachment functions */
static int ad7417_probe(device_t);
static int ad7417_attach(device_t);
/* Utility functions */
static int ad7417_sensor_sysctl(SYSCTL_HANDLER_ARGS);
static int ad7417_write(device_t dev, uint32_t addr, uint8_t reg,
uint8_t *buf, int len);
static int ad7417_read_1(device_t dev, uint32_t addr, uint8_t reg,
uint8_t *data);
static int ad7417_read_2(device_t dev, uint32_t addr, uint8_t reg,
uint16_t *data);
static int ad7417_write_read(device_t dev, uint32_t addr,
struct write_data out, struct read_data *in);
static int ad7417_diode_read(struct ad7417_sensor *sens);
static int ad7417_adc_read(struct ad7417_sensor *sens);
static int ad7417_sensor_read(struct ad7417_sensor *sens);
struct ad7417_softc {
device_t sc_dev;
uint32_t sc_addr;
struct ad7417_sensor *sc_sensors;
int sc_nsensors;
int init_done;
};
static device_method_t ad7417_methods[] = {
/* Device interface */
DEVMETHOD(device_probe, ad7417_probe),
DEVMETHOD(device_attach, ad7417_attach),
{ 0, 0 },
};
static driver_t ad7417_driver = {
"ad7417",
ad7417_methods,
sizeof(struct ad7417_softc)
};
static devclass_t ad7417_devclass;
DRIVER_MODULE(ad7417, iicbus, ad7417_driver, ad7417_devclass, 0, 0);
static MALLOC_DEFINE(M_AD7417, "ad7417", "Supply-Monitor AD7417");
static int
ad7417_write(device_t dev, uint32_t addr, uint8_t reg, uint8_t *buff, int len)
{
unsigned char buf[4];
int try = 0;
struct iic_msg msg[] = {
{ addr, IIC_M_WR, 0, buf }
};
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("ad7417_write", hz);
}
}
static int
ad7417_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 | IIC_M_NOSTOP, 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("ad7417_read_1", hz);
}
}
static int
ad7417_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 | IIC_M_NOSTOP, 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("ad7417_read_2", hz);
}
}
static int
ad7417_write_read(device_t dev, uint32_t addr, struct write_data out,
struct read_data *in)
{
uint8_t buf[4];
int err, try = 0;
/* Do a combined write/read. */
struct iic_msg msg[3] = {
{ addr, IIC_M_WR, 2, buf },
{ addr, IIC_M_WR | IIC_M_NOSTOP, 1, &in->reg },
{ addr, IIC_M_RD, 2, buf },
};
/* Prepare the write msg. */
buf[0] = out.reg;
buf[1] = out.val & 0xff;
for (;;)
{
err = iicbus_transfer(dev, msg, 3);
if (err != 0)
goto retry;
in->val = *((uint16_t*)buf);
return (0);
retry:
if (++try > 5) {
device_printf(dev, "iicbus write/read failed\n");
return (-1);
}
pause("ad7417_write_read", hz);
}
}
static int
ad7417_init_adc(device_t dev, uint32_t addr)
{
uint8_t buf;
int err;
struct ad7417_softc *sc;
sc = device_get_softc(dev);
adc741x_config = 0;
/* Clear Config2 */
buf = 0;
err = ad7417_write(dev, addr, AD7417_CONFIG2, &buf, 1);
/* Read & cache Config1 */
buf = 0;
err = ad7417_write(dev, addr, AD7417_CONFIG, &buf, 1);
err = ad7417_read_1(dev, addr, AD7417_CONFIG, &buf);
adc741x_config = (uint8_t)buf;
/* Disable shutdown mode */
adc741x_config &= 0xfe;
buf = adc741x_config;
err = ad7417_write(dev, addr, AD7417_CONFIG, &buf, 1);
if (err < 0)
return (-1);
sc->init_done = 1;
return (0);
}
static int
ad7417_probe(device_t dev)
{
const char *name, *compatible;
struct ad7417_softc *sc;
name = ofw_bus_get_name(dev);
compatible = ofw_bus_get_compat(dev);
if (!name)
return (ENXIO);
if (strcmp(name, "supply-monitor") != 0 ||
strcmp(compatible, "ad7417") != 0)
return (ENXIO);
sc = device_get_softc(dev);
sc->sc_dev = dev;
sc->sc_addr = iicbus_get_addr(dev);
device_set_desc(dev, "Supply-Monitor AD7417");
return (0);
}
/*
* This function returns the number of sensors. If we call it the second time
* and we have allocated memory for sc->sc_sensors, we fill in the properties.
*/
static int
ad7417_fill_sensor_prop(device_t dev)
{
phandle_t child;
struct ad7417_softc *sc;
u_int id[10];
char location[96];
char type[32];
int i = 0, j, len = 0, prop_len, prev_len = 0;
sc = device_get_softc(dev);
child = ofw_bus_get_node(dev);
/* Fill the sensor location property. */
prop_len = OF_getprop(child, "hwsensor-location", location,
sizeof(location));
while (len < prop_len) {
if (sc->sc_sensors != NULL)
strcpy(sc->sc_sensors[i].therm.name, location + len);
prev_len = strlen(location + len) + 1;
len += prev_len;
i++;
}
if (sc->sc_sensors == NULL)
return (i);
/* Fill the sensor type property. */
len = 0;
i = 0;
prev_len = 0;
prop_len = OF_getprop(child, "hwsensor-type", type, sizeof(type));
while (len < prop_len) {
if (strcmp(type + len, "temperature") == 0)
sc->sc_sensors[i].type = ADC7417_TEMP_SENSOR;
else
sc->sc_sensors[i].type = ADC7417_ADC_SENSOR;
prev_len = strlen(type + len) + 1;
len += prev_len;
i++;
}
/* Fill the sensor id property. Taken from OF. */
prop_len = OF_getprop(child, "hwsensor-id", id, sizeof(id));
for (j = 0; j < i; j++)
sc->sc_sensors[j].id = id[j];
/* Fill the sensor zone property. Taken from OF. */
prop_len = OF_getprop(child, "hwsensor-zone", id, sizeof(id));
for (j = 0; j < i; j++)
sc->sc_sensors[j].therm.zone = id[j];
/* Finish setting up sensor properties */
for (j = 0; j < i; j++) {
sc->sc_sensors[j].dev = dev;
/* HACK: Apple wired a random diode to the ADC line */
if (strstr(sc->sc_sensors[j].therm.name, "DIODE TEMP")
!= NULL) {
sc->sc_sensors[j].type = ADC7417_TEMP_SENSOR;
sc->sc_sensors[j].therm.read =
(int (*)(struct pmac_therm *))(ad7417_diode_read);
} else {
sc->sc_sensors[j].therm.read =
(int (*)(struct pmac_therm *))(ad7417_sensor_read);
}
if (sc->sc_sensors[j].type != ADC7417_TEMP_SENSOR)
continue;
/* Make up some ranges */
sc->sc_sensors[j].therm.target_temp = 500 + ZERO_C_TO_K;
sc->sc_sensors[j].therm.max_temp = 900 + ZERO_C_TO_K;
pmac_thermal_sensor_register(&sc->sc_sensors[j].therm);
}
return (i);
}
static int
ad7417_attach(device_t dev)
{
struct ad7417_softc *sc;
struct sysctl_oid *oid, *sensroot_oid;
struct sysctl_ctx_list *ctx;
char sysctl_name[32];
int i, j;
const char *unit;
const char *desc;
sc = device_get_softc(dev);
sc->sc_nsensors = 0;
/* Count the actual number of sensors. */
sc->sc_nsensors = ad7417_fill_sensor_prop(dev);
device_printf(dev, "%d sensors detected.\n", sc->sc_nsensors);
if (sc->sc_nsensors == 0)
device_printf(dev, "WARNING: No AD7417 sensors detected!\n");
sc->sc_sensors = malloc (sc->sc_nsensors * sizeof(struct ad7417_sensor),
M_AD7417, M_WAITOK | M_ZERO);
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, "AD7417 Sensor Information");
/* Now we can fill the properties into the allocated struct. */
sc->sc_nsensors = ad7417_fill_sensor_prop(dev);
/* Add sysctls for the sensors. */
for (i = 0; i < sc->sc_nsensors; i++) {
for (j = 0; j < strlen(sc->sc_sensors[i].therm.name); j++) {
sysctl_name[j] =
tolower(sc->sc_sensors[i].therm.name[j]);
if (isspace(sysctl_name[j]))
sysctl_name[j] = '_';
}
sysctl_name[j] = 0;
oid = SYSCTL_ADD_NODE(ctx, SYSCTL_CHILDREN(sensroot_oid),
OID_AUTO,
sysctl_name, CTLFLAG_RD, 0,
"Sensor Information");
if (sc->sc_sensors[i].type == ADC7417_TEMP_SENSOR) {
unit = "temp";
desc = "sensor unit (C)";
} else {
unit = "volt";
desc = "sensor unit (mV)";
}
/* I use i to pass the sensor id. */
SYSCTL_ADD_PROC(ctx, SYSCTL_CHILDREN(oid), OID_AUTO,
unit, CTLTYPE_INT | CTLFLAG_RD, dev,
i, ad7417_sensor_sysctl,
sc->sc_sensors[i].type == ADC7417_TEMP_SENSOR ?
"IK" : "I", desc);
}
/* Dump sensor location, ID & type. */
if (bootverbose) {
device_printf(dev, "Sensors\n");
for (i = 0; i < sc->sc_nsensors; i++) {
device_printf(dev, "Location: %s ID: %d type: %d\n",
sc->sc_sensors[i].therm.name,
sc->sc_sensors[i].id,
sc->sc_sensors[i].type);
}
}
return (0);
}
static int
ad7417_get_temp(device_t dev, uint32_t addr, int *temp)
{
uint16_t buf[2];
uint16_t read;
int err;
err = ad7417_read_2(dev, addr, AD7417_TEMP, buf);
if (err < 0)
return (-1);
read = *((int16_t*)buf);
/* The ADC is 10 bit, the resolution is 0.25 C.
The temperature is in tenth kelvin.
*/
*temp = (((int16_t)(read & 0xffc0)) >> 6) * 25 / 10;
return (0);
}
static int
ad7417_get_adc(device_t dev, uint32_t addr, unsigned int *value,
uint8_t chan)
{
uint8_t tmp;
int err;
struct write_data config;
struct read_data data;
tmp = chan << 5;
config.reg = AD7417_CONFIG;
data.reg = AD7417_ADC;
data.val = 0;
err = ad7417_read_1(dev, addr, AD7417_CONFIG, &config.val);
config.val = (config.val & ~AD7417_CONFMASK) | (tmp & AD7417_CONFMASK);
err = ad7417_write_read(dev, addr, config, &data);
if (err < 0)
return (-1);
*value = ((uint32_t)data.val) >> 6;
return (0);
}
static int
ad7417_diode_read(struct ad7417_sensor *sens)
{
static int eeprom_read = 0;
static cell_t eeprom[2][40];
phandle_t eeprom_node;
int rawval, diode_slope, diode_offset;
int temp;
if (!eeprom_read) {
eeprom_node = OF_finddevice("/u3/i2c/cpuid@a0");
OF_getprop(eeprom_node, "cpuid", eeprom[0], sizeof(eeprom[0]));
eeprom_node = OF_finddevice("/u3/i2c/cpuid@a2");
OF_getprop(eeprom_node, "cpuid", eeprom[1], sizeof(eeprom[1]));
eeprom_read = 1;
}
rawval = ad7417_adc_read(sens);
if (rawval < 0)
return (-1);
if (strstr(sens->therm.name, "CPU B") != NULL) {
diode_slope = eeprom[1][0x11] >> 16;
diode_offset = (int16_t)(eeprom[1][0x11] & 0xffff) << 12;
} else {
diode_slope = eeprom[0][0x11] >> 16;
diode_offset = (int16_t)(eeprom[0][0x11] & 0xffff) << 12;
}
temp = (rawval*diode_slope + diode_offset) >> 2;
temp = (10*(temp >> 16)) + ((10*(temp & 0xffff)) >> 16);
return (temp + ZERO_C_TO_K);
}
static int
ad7417_adc_read(struct ad7417_sensor *sens)
{
struct ad7417_softc *sc;
uint8_t chan;
int temp;
sc = device_get_softc(sens->dev);
switch (sens->id) {
case 11:
case 16:
chan = 1;
break;
case 12:
case 17:
chan = 2;
break;
case 13:
case 18:
chan = 3;
break;
case 14:
case 19:
chan = 4;
break;
default:
chan = 1;
}
if (ad7417_get_adc(sc->sc_dev, sc->sc_addr, &temp, chan) < 0)
return (-1);
return (temp);
}
static int
ad7417_sensor_read(struct ad7417_sensor *sens)
{
struct ad7417_softc *sc;
int temp;
sc = device_get_softc(sens->dev);
/* Init the ADC if not already done.*/
if (!sc->init_done)
if (ad7417_init_adc(sc->sc_dev, sc->sc_addr) < 0)
return (-1);
if (sens->type == ADC7417_TEMP_SENSOR) {
if (ad7417_get_temp(sc->sc_dev, sc->sc_addr, &temp) < 0)
return (-1);
temp += ZERO_C_TO_K;
} else {
temp = ad7417_adc_read(sens);
}
return (temp);
}
static int
ad7417_sensor_sysctl(SYSCTL_HANDLER_ARGS)
{
device_t dev;
struct ad7417_softc *sc;
struct ad7417_sensor *sens;
int value = 0;
int error;
dev = arg1;
sc = device_get_softc(dev);
sens = &sc->sc_sensors[arg2];
value = sens->therm.read(&sens->therm);
if (value < 0)
return (ENXIO);
error = sysctl_handle_int(oidp, &value, 0, req);
return (error);
}