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freebsd-nq/sys/dev/iicbus/ad7417.c
Andreas Tobler d91c258074 - Improve error handling. 
- Add retry loops in the i2c read/write functions.
- Combied the ADC channel selection and readout of the value into
  one iicbus_transfer to avoid possible races.

Reviewed by: nwhitehorn
2011-06-08 16:00:30 +00:00

622 lines
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/*-
* 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;
};
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);
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;
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);
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 temp in C";
} else {
unit = "volt";
desc = "Sensor Volt in V";
}
/* 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 (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);
}
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