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linux-next/drivers/hwmon/pmbus_core.c
Guenter Roeck 9f6ad1ce64 hwmon: (pmbus) Fix LINEAR16 data format 
LINEAR16 data format is unsigned, not signed. Impact is that affected
attributes report negative values in the upper half of the supported
value range.

Signed-off-by: Guenter Roeck <guenter.roeck@ericsson.com>
2011-03-14 22:39:11 -07:00

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/*
* Hardware monitoring driver for PMBus devices
*
* Copyright (c) 2010, 2011 Ericsson AB.
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
*/
#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/init.h>
#include <linux/err.h>
#include <linux/slab.h>
#include <linux/i2c.h>
#include <linux/hwmon.h>
#include <linux/hwmon-sysfs.h>
#include <linux/delay.h>
#include <linux/i2c/pmbus.h>
#include "pmbus.h"
/*
* Constants needed to determine number of sensors, booleans, and labels.
*/
#define PMBUS_MAX_INPUT_SENSORS 11 /* 6*volt, 3*curr, 2*power */
#define PMBUS_VOUT_SENSORS_PER_PAGE 5 /* input, min, max, lcrit,
crit */
#define PMBUS_IOUT_SENSORS_PER_PAGE 4 /* input, min, max, crit */
#define PMBUS_POUT_SENSORS_PER_PAGE 4 /* input, cap, max, crit */
#define PMBUS_MAX_SENSORS_PER_FAN 1 /* input */
#define PMBUS_MAX_SENSORS_PER_TEMP 5 /* input, min, max, lcrit,
crit */
#define PMBUS_MAX_INPUT_BOOLEANS 7 /* v: min_alarm, max_alarm,
lcrit_alarm, crit_alarm;
c: alarm, crit_alarm;
p: crit_alarm */
#define PMBUS_VOUT_BOOLEANS_PER_PAGE 4 /* min_alarm, max_alarm,
lcrit_alarm, crit_alarm */
#define PMBUS_IOUT_BOOLEANS_PER_PAGE 3 /* alarm, lcrit_alarm,
crit_alarm */
#define PMBUS_POUT_BOOLEANS_PER_PAGE 2 /* alarm, crit_alarm */
#define PMBUS_MAX_BOOLEANS_PER_FAN 2 /* alarm, fault */
#define PMBUS_MAX_BOOLEANS_PER_TEMP 4 /* min_alarm, max_alarm,
lcrit_alarm, crit_alarm */
#define PMBUS_MAX_INPUT_LABELS 4 /* vin, vcap, iin, pin */
/*
* status, status_vout, status_iout, status_fans, status_fan34, and status_temp
* are paged. status_input is unpaged.
*/
#define PB_NUM_STATUS_REG (PMBUS_PAGES * 6 + 1)
/*
* Index into status register array, per status register group
*/
#define PB_STATUS_BASE 0
#define PB_STATUS_VOUT_BASE (PB_STATUS_BASE + PMBUS_PAGES)
#define PB_STATUS_IOUT_BASE (PB_STATUS_VOUT_BASE + PMBUS_PAGES)
#define PB_STATUS_FAN_BASE (PB_STATUS_IOUT_BASE + PMBUS_PAGES)
#define PB_STATUS_FAN34_BASE (PB_STATUS_FAN_BASE + PMBUS_PAGES)
#define PB_STATUS_INPUT_BASE (PB_STATUS_FAN34_BASE + PMBUS_PAGES)
#define PB_STATUS_TEMP_BASE (PB_STATUS_INPUT_BASE + 1)
struct pmbus_sensor {
char name[I2C_NAME_SIZE]; /* sysfs sensor name */
struct sensor_device_attribute attribute;
u8 page; /* page number */
u8 reg; /* register */
enum pmbus_sensor_classes class; /* sensor class */
bool update; /* runtime sensor update needed */
int data; /* Sensor data.
Negative if there was a read error */
};
struct pmbus_boolean {
char name[I2C_NAME_SIZE]; /* sysfs boolean name */
struct sensor_device_attribute attribute;
};
struct pmbus_label {
char name[I2C_NAME_SIZE]; /* sysfs label name */
struct sensor_device_attribute attribute;
char label[I2C_NAME_SIZE]; /* label */
};
struct pmbus_data {
struct device *hwmon_dev;
u32 flags; /* from platform data */
int exponent; /* linear mode: exponent for output voltages */
const struct pmbus_driver_info *info;
int max_attributes;
int num_attributes;
struct attribute **attributes;
struct attribute_group group;
/*
* Sensors cover both sensor and limit registers.
*/
int max_sensors;
int num_sensors;
struct pmbus_sensor *sensors;
/*
* Booleans are used for alarms.
* Values are determined from status registers.
*/
int max_booleans;
int num_booleans;
struct pmbus_boolean *booleans;
/*
* Labels are used to map generic names (e.g., "in1")
* to PMBus specific names (e.g., "vin" or "vout1").
*/
int max_labels;
int num_labels;
struct pmbus_label *labels;
struct mutex update_lock;
bool valid;
unsigned long last_updated; /* in jiffies */
/*
* A single status register covers multiple attributes,
* so we keep them all together.
*/
u8 status_bits;
u8 status[PB_NUM_STATUS_REG];
u8 currpage;
};
int pmbus_set_page(struct i2c_client *client, u8 page)
{
struct pmbus_data *data = i2c_get_clientdata(client);
int rv = 0;
int newpage;
if (page != data->currpage) {
rv = i2c_smbus_write_byte_data(client, PMBUS_PAGE, page);
newpage = i2c_smbus_read_byte_data(client, PMBUS_PAGE);
if (newpage != page)
rv = -EINVAL;
else
data->currpage = page;
}
return rv;
}
EXPORT_SYMBOL_GPL(pmbus_set_page);
static int pmbus_write_byte(struct i2c_client *client, u8 page, u8 value)
{
int rv;
rv = pmbus_set_page(client, page);
if (rv < 0)
return rv;
return i2c_smbus_write_byte(client, value);
}
static int pmbus_write_word_data(struct i2c_client *client, u8 page, u8 reg,
u16 word)
{
int rv;
rv = pmbus_set_page(client, page);
if (rv < 0)
return rv;
return i2c_smbus_write_word_data(client, reg, word);
}
int pmbus_read_word_data(struct i2c_client *client, u8 page, u8 reg)
{
int rv;
rv = pmbus_set_page(client, page);
if (rv < 0)
return rv;
return i2c_smbus_read_word_data(client, reg);
}
EXPORT_SYMBOL_GPL(pmbus_read_word_data);
static int pmbus_read_byte_data(struct i2c_client *client, u8 page, u8 reg)
{
int rv;
rv = pmbus_set_page(client, page);
if (rv < 0)
return rv;
return i2c_smbus_read_byte_data(client, reg);
}
static void pmbus_clear_fault_page(struct i2c_client *client, int page)
{
pmbus_write_byte(client, page, PMBUS_CLEAR_FAULTS);
}
void pmbus_clear_faults(struct i2c_client *client)
{
struct pmbus_data *data = i2c_get_clientdata(client);
int i;
for (i = 0; i < data->info->pages; i++)
pmbus_clear_fault_page(client, i);
}
EXPORT_SYMBOL_GPL(pmbus_clear_faults);
static int pmbus_check_status_cml(struct i2c_client *client, int page)
{
int status, status2;
status = pmbus_read_byte_data(client, page, PMBUS_STATUS_BYTE);
if (status < 0 || (status & PB_STATUS_CML)) {
status2 = pmbus_read_byte_data(client, page, PMBUS_STATUS_CML);
if (status2 < 0 || (status2 & PB_CML_FAULT_INVALID_COMMAND))
return -EINVAL;
}
return 0;
}
bool pmbus_check_byte_register(struct i2c_client *client, int page, int reg)
{
int rv;
struct pmbus_data *data = i2c_get_clientdata(client);
rv = pmbus_read_byte_data(client, page, reg);
if (rv >= 0 && !(data->flags & PMBUS_SKIP_STATUS_CHECK))
rv = pmbus_check_status_cml(client, page);
pmbus_clear_fault_page(client, page);
return rv >= 0;
}
EXPORT_SYMBOL_GPL(pmbus_check_byte_register);
bool pmbus_check_word_register(struct i2c_client *client, int page, int reg)
{
int rv;
struct pmbus_data *data = i2c_get_clientdata(client);
rv = pmbus_read_word_data(client, page, reg);
if (rv >= 0 && !(data->flags & PMBUS_SKIP_STATUS_CHECK))
rv = pmbus_check_status_cml(client, page);
pmbus_clear_fault_page(client, page);
return rv >= 0;
}
EXPORT_SYMBOL_GPL(pmbus_check_word_register);
const struct pmbus_driver_info *pmbus_get_driver_info(struct i2c_client *client)
{
struct pmbus_data *data = i2c_get_clientdata(client);
return data->info;
}
EXPORT_SYMBOL_GPL(pmbus_get_driver_info);
static int pmbus_get_status(struct i2c_client *client, int page, int reg)
{
struct pmbus_data *data = i2c_get_clientdata(client);
const struct pmbus_driver_info *info = data->info;
int status;
if (info->get_status) {
status = info->get_status(client, page, reg);
if (status != -ENODATA)
return status;
}
return pmbus_read_byte_data(client, page, reg);
}
static struct pmbus_data *pmbus_update_device(struct device *dev)
{
struct i2c_client *client = to_i2c_client(dev);
struct pmbus_data *data = i2c_get_clientdata(client);
const struct pmbus_driver_info *info = data->info;
mutex_lock(&data->update_lock);
if (time_after(jiffies, data->last_updated + HZ) || !data->valid) {
int i;
for (i = 0; i < info->pages; i++)
data->status[PB_STATUS_BASE + i]
= pmbus_read_byte_data(client, i,
PMBUS_STATUS_BYTE);
for (i = 0; i < info->pages; i++) {
if (!(info->func[i] & PMBUS_HAVE_STATUS_VOUT))
continue;
data->status[PB_STATUS_VOUT_BASE + i]
= pmbus_get_status(client, i, PMBUS_STATUS_VOUT);
}
for (i = 0; i < info->pages; i++) {
if (!(info->func[i] & PMBUS_HAVE_STATUS_IOUT))
continue;
data->status[PB_STATUS_IOUT_BASE + i]
= pmbus_get_status(client, i, PMBUS_STATUS_IOUT);
}
for (i = 0; i < info->pages; i++) {
if (!(info->func[i] & PMBUS_HAVE_STATUS_TEMP))
continue;
data->status[PB_STATUS_TEMP_BASE + i]
= pmbus_get_status(client, i,
PMBUS_STATUS_TEMPERATURE);
}
for (i = 0; i < info->pages; i++) {
if (!(info->func[i] & PMBUS_HAVE_STATUS_FAN12))
continue;
data->status[PB_STATUS_FAN_BASE + i]
= pmbus_get_status(client, i, PMBUS_STATUS_FAN_12);
}
for (i = 0; i < info->pages; i++) {
if (!(info->func[i] & PMBUS_HAVE_STATUS_FAN34))
continue;
data->status[PB_STATUS_FAN34_BASE + i]
= pmbus_get_status(client, i, PMBUS_STATUS_FAN_34);
}
if (info->func[0] & PMBUS_HAVE_STATUS_INPUT)
data->status[PB_STATUS_INPUT_BASE]
= pmbus_get_status(client, 0, PMBUS_STATUS_INPUT);
for (i = 0; i < data->num_sensors; i++) {
struct pmbus_sensor *sensor = &data->sensors[i];
if (!data->valid || sensor->update)
sensor->data
= pmbus_read_word_data(client, sensor->page,
sensor->reg);
}
pmbus_clear_faults(client);
data->last_updated = jiffies;
data->valid = 1;
}
mutex_unlock(&data->update_lock);
return data;
}
/*
* Convert linear sensor values to milli- or micro-units
* depending on sensor type.
*/
static int pmbus_reg2data_linear(struct pmbus_data *data,
struct pmbus_sensor *sensor)
{
s16 exponent;
s32 mantissa;
long val;
if (sensor->class == PSC_VOLTAGE_OUT) { /* LINEAR16 */
exponent = data->exponent;
mantissa = (u16) sensor->data;
} else { /* LINEAR11 */
exponent = (sensor->data >> 11) & 0x001f;
mantissa = sensor->data & 0x07ff;
if (exponent > 0x0f)
exponent |= 0xffe0; /* sign extend exponent */
if (mantissa > 0x03ff)
mantissa |= 0xfffff800; /* sign extend mantissa */
}
val = mantissa;
/* scale result to milli-units for all sensors except fans */
if (sensor->class != PSC_FAN)
val = val * 1000L;
/* scale result to micro-units for power sensors */
if (sensor->class == PSC_POWER)
val = val * 1000L;
if (exponent >= 0)
val <<= exponent;
else
val >>= -exponent;
return (int)val;
}
/*
* Convert direct sensor values to milli- or micro-units
* depending on sensor type.
*/
static int pmbus_reg2data_direct(struct pmbus_data *data,
struct pmbus_sensor *sensor)
{
long val = (s16) sensor->data;
long m, b, R;
m = data->info->m[sensor->class];
b = data->info->b[sensor->class];
R = data->info->R[sensor->class];
if (m == 0)
return 0;
/* X = 1/m * (Y * 10^-R - b) */
R = -R;
/* scale result to milli-units for everything but fans */
if (sensor->class != PSC_FAN) {
R += 3;
b *= 1000;
}
/* scale result to micro-units for power sensors */
if (sensor->class == PSC_POWER) {
R += 3;
b *= 1000;
}
while (R > 0) {
val *= 10;
R--;
}
while (R < 0) {
val = DIV_ROUND_CLOSEST(val, 10);
R++;
}
return (int)((val - b) / m);
}
static int pmbus_reg2data(struct pmbus_data *data, struct pmbus_sensor *sensor)
{
int val;
if (data->info->direct[sensor->class])
val = pmbus_reg2data_direct(data, sensor);
else
val = pmbus_reg2data_linear(data, sensor);
return val;
}
#define MAX_MANTISSA (1023 * 1000)
#define MIN_MANTISSA (511 * 1000)
static u16 pmbus_data2reg_linear(struct pmbus_data *data,
enum pmbus_sensor_classes class, long val)
{
s16 exponent = 0, mantissa;
bool negative = false;
/* simple case */
if (val == 0)
return 0;
if (class == PSC_VOLTAGE_OUT) {
/* LINEAR16 does not support negative voltages */
if (val < 0)
return 0;
/*
* For a static exponents, we don't have a choice
* but to adjust the value to it.
*/
if (data->exponent < 0)
val <<= -data->exponent;
else
val >>= data->exponent;
val = DIV_ROUND_CLOSEST(val, 1000);
return val & 0xffff;
}
if (val < 0) {
negative = true;
val = -val;
}
/* Power is in uW. Convert to mW before converting. */
if (class == PSC_POWER)
val = DIV_ROUND_CLOSEST(val, 1000L);
/*
* For simplicity, convert fan data to milli-units
* before calculating the exponent.
*/
if (class == PSC_FAN)
val = val * 1000;
/* Reduce large mantissa until it fits into 10 bit */
while (val >= MAX_MANTISSA && exponent < 15) {
exponent++;
val >>= 1;
}
/* Increase small mantissa to improve precision */
while (val < MIN_MANTISSA && exponent > -15) {
exponent--;
val <<= 1;
}
/* Convert mantissa from milli-units to units */
mantissa = DIV_ROUND_CLOSEST(val, 1000);
/* Ensure that resulting number is within range */
if (mantissa > 0x3ff)
mantissa = 0x3ff;
/* restore sign */
if (negative)
mantissa = -mantissa;
/* Convert to 5 bit exponent, 11 bit mantissa */
return (mantissa & 0x7ff) | ((exponent << 11) & 0xf800);
}
static u16 pmbus_data2reg_direct(struct pmbus_data *data,
enum pmbus_sensor_classes class, long val)
{
long m, b, R;
m = data->info->m[class];
b = data->info->b[class];
R = data->info->R[class];
/* Power is in uW. Adjust R and b. */
if (class == PSC_POWER) {
R -= 3;
b *= 1000;
}
/* Calculate Y = (m * X + b) * 10^R */
if (class != PSC_FAN) {
R -= 3; /* Adjust R and b for data in milli-units */
b *= 1000;
}
val = val * m + b;
while (R > 0) {
val *= 10;
R--;
}
while (R < 0) {
val = DIV_ROUND_CLOSEST(val, 10);
R++;
}
return val;
}
static u16 pmbus_data2reg(struct pmbus_data *data,
enum pmbus_sensor_classes class, long val)
{
u16 regval;
if (data->info->direct[class])
regval = pmbus_data2reg_direct(data, class, val);
else
regval = pmbus_data2reg_linear(data, class, val);
return regval;
}
/*
* Return boolean calculated from converted data.
* <index> defines a status register index and mask, and optionally
* two sensor indexes.
* The upper half-word references the two sensors,
* two sensor indices.
* The upper half-word references the two optional sensors,
* the lower half word references status register and mask.
* The function returns true if (status[reg] & mask) is true and,
* if specified, if v1 >= v2.
* To determine if an object exceeds upper limits, specify <v, limit>.
* To determine if an object exceeds lower limits, specify <limit, v>.
*
* For booleans created with pmbus_add_boolean_reg(), only the lower 16 bits of
* index are set. s1 and s2 (the sensor index values) are zero in this case.
* The function returns true if (status[reg] & mask) is true.
*
* If the boolean was created with pmbus_add_boolean_cmp(), a comparison against
* a specified limit has to be performed to determine the boolean result.
* In this case, the function returns true if v1 >= v2 (where v1 and v2 are
* sensor values referenced by sensor indices s1 and s2).
*
* To determine if an object exceeds upper limits, specify <s1,s2> = <v,limit>.
* To determine if an object exceeds lower limits, specify <s1,s2> = <limit,v>.
*
* If a negative value is stored in any of the referenced registers, this value
* reflects an error code which will be returned.
*/
static int pmbus_get_boolean(struct pmbus_data *data, int index, int *val)
{
u8 s1 = (index >> 24) & 0xff;
u8 s2 = (index >> 16) & 0xff;
u8 reg = (index >> 8) & 0xff;
u8 mask = index & 0xff;
int status;
u8 regval;
status = data->status[reg];
if (status < 0)
return status;
regval = status & mask;
if (!s1 && !s2)
*val = !!regval;
else {
int v1, v2;
struct pmbus_sensor *sensor1, *sensor2;
sensor1 = &data->sensors[s1];
if (sensor1->data < 0)
return sensor1->data;
sensor2 = &data->sensors[s2];
if (sensor2->data < 0)
return sensor2->data;
v1 = pmbus_reg2data(data, sensor1);
v2 = pmbus_reg2data(data, sensor2);
*val = !!(regval && v1 >= v2);
}
return 0;
}
static ssize_t pmbus_show_boolean(struct device *dev,
struct device_attribute *da, char *buf)
{
struct sensor_device_attribute *attr = to_sensor_dev_attr(da);
struct pmbus_data *data = pmbus_update_device(dev);
int val;
int err;
err = pmbus_get_boolean(data, attr->index, &val);
if (err)
return err;
return snprintf(buf, PAGE_SIZE, "%d\n", val);
}
static ssize_t pmbus_show_sensor(struct device *dev,
struct device_attribute *da, char *buf)
{
struct sensor_device_attribute *attr = to_sensor_dev_attr(da);
struct pmbus_data *data = pmbus_update_device(dev);
struct pmbus_sensor *sensor;
sensor = &data->sensors[attr->index];
if (sensor->data < 0)
return sensor->data;
return snprintf(buf, PAGE_SIZE, "%d\n", pmbus_reg2data(data, sensor));
}
static ssize_t pmbus_set_sensor(struct device *dev,
struct device_attribute *devattr,
const char *buf, size_t count)
{
struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr);
struct i2c_client *client = to_i2c_client(dev);
struct pmbus_data *data = i2c_get_clientdata(client);
struct pmbus_sensor *sensor = &data->sensors[attr->index];
ssize_t rv = count;
long val = 0;
int ret;
u16 regval;
if (strict_strtol(buf, 10, &val) < 0)
return -EINVAL;
mutex_lock(&data->update_lock);
regval = pmbus_data2reg(data, sensor->class, val);
ret = pmbus_write_word_data(client, sensor->page, sensor->reg, regval);
if (ret < 0)
rv = ret;
else
data->sensors[attr->index].data = regval;
mutex_unlock(&data->update_lock);
return rv;
}
static ssize_t pmbus_show_label(struct device *dev,
struct device_attribute *da, char *buf)
{
struct i2c_client *client = to_i2c_client(dev);
struct pmbus_data *data = i2c_get_clientdata(client);
struct sensor_device_attribute *attr = to_sensor_dev_attr(da);
return snprintf(buf, PAGE_SIZE, "%s\n",
data->labels[attr->index].label);
}
#define PMBUS_ADD_ATTR(data, _name, _idx, _mode, _type, _show, _set) \
do { \
struct sensor_device_attribute *a \
= &data->_type##s[data->num_##_type##s].attribute; \
BUG_ON(data->num_attributes >= data->max_attributes); \
a->dev_attr.attr.name = _name; \
a->dev_attr.attr.mode = _mode; \
a->dev_attr.show = _show; \
a->dev_attr.store = _set; \
a->index = _idx; \
data->attributes[data->num_attributes] = &a->dev_attr.attr; \
data->num_attributes++; \
} while (0)
#define PMBUS_ADD_GET_ATTR(data, _name, _type, _idx) \
PMBUS_ADD_ATTR(data, _name, _idx, S_IRUGO, _type, \
pmbus_show_##_type, NULL)
#define PMBUS_ADD_SET_ATTR(data, _name, _type, _idx) \
PMBUS_ADD_ATTR(data, _name, _idx, S_IWUSR | S_IRUGO, _type, \
pmbus_show_##_type, pmbus_set_##_type)
static void pmbus_add_boolean(struct pmbus_data *data,
const char *name, const char *type, int seq,
int idx)
{
struct pmbus_boolean *boolean;
BUG_ON(data->num_booleans >= data->max_booleans);
boolean = &data->booleans[data->num_booleans];
snprintf(boolean->name, sizeof(boolean->name), "%s%d_%s",
name, seq, type);
PMBUS_ADD_GET_ATTR(data, boolean->name, boolean, idx);
data->num_booleans++;
}
static void pmbus_add_boolean_reg(struct pmbus_data *data,
const char *name, const char *type,
int seq, int reg, int bit)
{
pmbus_add_boolean(data, name, type, seq, (reg << 8) | bit);
}
static void pmbus_add_boolean_cmp(struct pmbus_data *data,
const char *name, const char *type,
int seq, int i1, int i2, int reg, int mask)
{
pmbus_add_boolean(data, name, type, seq,
(i1 << 24) | (i2 << 16) | (reg << 8) | mask);
}
static void pmbus_add_sensor(struct pmbus_data *data,
const char *name, const char *type, int seq,
int page, int reg, enum pmbus_sensor_classes class,
bool update)
{
struct pmbus_sensor *sensor;
BUG_ON(data->num_sensors >= data->max_sensors);
sensor = &data->sensors[data->num_sensors];
snprintf(sensor->name, sizeof(sensor->name), "%s%d_%s",
name, seq, type);
sensor->page = page;
sensor->reg = reg;
sensor->class = class;
sensor->update = update;
if (update)
PMBUS_ADD_GET_ATTR(data, sensor->name, sensor,
data->num_sensors);
else
PMBUS_ADD_SET_ATTR(data, sensor->name, sensor,
data->num_sensors);
data->num_sensors++;
}
static void pmbus_add_label(struct pmbus_data *data,
const char *name, int seq,
const char *lstring, int index)
{
struct pmbus_label *label;
BUG_ON(data->num_labels >= data->max_labels);
label = &data->labels[data->num_labels];
snprintf(label->name, sizeof(label->name), "%s%d_label", name, seq);
if (!index)
strncpy(label->label, lstring, sizeof(label->label) - 1);
else
snprintf(label->label, sizeof(label->label), "%s%d", lstring,
index);
PMBUS_ADD_GET_ATTR(data, label->name, label, data->num_labels);
data->num_labels++;
}
static const int pmbus_temp_registers[] = {
PMBUS_READ_TEMPERATURE_1,
PMBUS_READ_TEMPERATURE_2,
PMBUS_READ_TEMPERATURE_3
};
static const int pmbus_temp_flags[] = {
PMBUS_HAVE_TEMP,
PMBUS_HAVE_TEMP2,
PMBUS_HAVE_TEMP3
};
static const int pmbus_fan_registers[] = {
PMBUS_READ_FAN_SPEED_1,
PMBUS_READ_FAN_SPEED_2,
PMBUS_READ_FAN_SPEED_3,
PMBUS_READ_FAN_SPEED_4
};
static const int pmbus_fan_config_registers[] = {
PMBUS_FAN_CONFIG_12,
PMBUS_FAN_CONFIG_12,
PMBUS_FAN_CONFIG_34,
PMBUS_FAN_CONFIG_34
};
static const int pmbus_fan_status_registers[] = {
PMBUS_STATUS_FAN_12,
PMBUS_STATUS_FAN_12,
PMBUS_STATUS_FAN_34,
PMBUS_STATUS_FAN_34
};
static const u32 pmbus_fan_flags[] = {
PMBUS_HAVE_FAN12,
PMBUS_HAVE_FAN12,
PMBUS_HAVE_FAN34,
PMBUS_HAVE_FAN34
};
static const u32 pmbus_fan_status_flags[] = {
PMBUS_HAVE_STATUS_FAN12,
PMBUS_HAVE_STATUS_FAN12,
PMBUS_HAVE_STATUS_FAN34,
PMBUS_HAVE_STATUS_FAN34
};
/*
* Determine maximum number of sensors, booleans, and labels.
* To keep things simple, only make a rough high estimate.
*/
static void pmbus_find_max_attr(struct i2c_client *client,
struct pmbus_data *data)
{
const struct pmbus_driver_info *info = data->info;
int page, max_sensors, max_booleans, max_labels;
max_sensors = PMBUS_MAX_INPUT_SENSORS;
max_booleans = PMBUS_MAX_INPUT_BOOLEANS;
max_labels = PMBUS_MAX_INPUT_LABELS;
for (page = 0; page < info->pages; page++) {
if (info->func[page] & PMBUS_HAVE_VOUT) {
max_sensors += PMBUS_VOUT_SENSORS_PER_PAGE;
max_booleans += PMBUS_VOUT_BOOLEANS_PER_PAGE;
max_labels++;
}
if (info->func[page] & PMBUS_HAVE_IOUT) {
max_sensors += PMBUS_IOUT_SENSORS_PER_PAGE;
max_booleans += PMBUS_IOUT_BOOLEANS_PER_PAGE;
max_labels++;
}
if (info->func[page] & PMBUS_HAVE_POUT) {
max_sensors += PMBUS_POUT_SENSORS_PER_PAGE;
max_booleans += PMBUS_POUT_BOOLEANS_PER_PAGE;
max_labels++;
}
if (info->func[page] & PMBUS_HAVE_FAN12) {
max_sensors += 2 * PMBUS_MAX_SENSORS_PER_FAN;
max_booleans += 2 * PMBUS_MAX_BOOLEANS_PER_FAN;
}
if (info->func[page] & PMBUS_HAVE_FAN34) {
max_sensors += 2 * PMBUS_MAX_SENSORS_PER_FAN;
max_booleans += 2 * PMBUS_MAX_BOOLEANS_PER_FAN;
}
if (info->func[page] & PMBUS_HAVE_TEMP) {
max_sensors += PMBUS_MAX_SENSORS_PER_TEMP;
max_booleans += PMBUS_MAX_BOOLEANS_PER_TEMP;
}
if (info->func[page] & PMBUS_HAVE_TEMP2) {
max_sensors += PMBUS_MAX_SENSORS_PER_TEMP;
max_booleans += PMBUS_MAX_BOOLEANS_PER_TEMP;
}
if (info->func[page] & PMBUS_HAVE_TEMP3) {
max_sensors += PMBUS_MAX_SENSORS_PER_TEMP;
max_booleans += PMBUS_MAX_BOOLEANS_PER_TEMP;
}
}
data->max_sensors = max_sensors;
data->max_booleans = max_booleans;
data->max_labels = max_labels;
data->max_attributes = max_sensors + max_booleans + max_labels;
}
/*
* Search for attributes. Allocate sensors, booleans, and labels as needed.
*/
static void pmbus_find_attributes(struct i2c_client *client,
struct pmbus_data *data)
{
const struct pmbus_driver_info *info = data->info;
int page, i0, i1, in_index;
/*
* Input voltage sensors
*/
in_index = 1;
if (info->func[0] & PMBUS_HAVE_VIN) {
bool have_alarm = false;
i0 = data->num_sensors;
pmbus_add_label(data, "in", in_index, "vin", 0);
pmbus_add_sensor(data, "in", "input", in_index,
0, PMBUS_READ_VIN, PSC_VOLTAGE_IN, true);
if (pmbus_check_word_register(client, 0,
PMBUS_VIN_UV_WARN_LIMIT)) {
i1 = data->num_sensors;
pmbus_add_sensor(data, "in", "min", in_index,
0, PMBUS_VIN_UV_WARN_LIMIT,
PSC_VOLTAGE_IN, false);
if (info->func[0] & PMBUS_HAVE_STATUS_INPUT) {
pmbus_add_boolean_reg(data, "in", "min_alarm",
in_index,
PB_STATUS_INPUT_BASE,
PB_VOLTAGE_UV_WARNING);
have_alarm = true;
}
}
if (pmbus_check_word_register(client, 0,
PMBUS_VIN_UV_FAULT_LIMIT)) {
i1 = data->num_sensors;
pmbus_add_sensor(data, "in", "lcrit", in_index,
0, PMBUS_VIN_UV_FAULT_LIMIT,
PSC_VOLTAGE_IN, false);
if (info->func[0] & PMBUS_HAVE_STATUS_INPUT) {
pmbus_add_boolean_reg(data, "in", "lcrit_alarm",
in_index,
PB_STATUS_INPUT_BASE,
PB_VOLTAGE_UV_FAULT);
have_alarm = true;
}
}
if (pmbus_check_word_register(client, 0,
PMBUS_VIN_OV_WARN_LIMIT)) {
i1 = data->num_sensors;
pmbus_add_sensor(data, "in", "max", in_index,
0, PMBUS_VIN_OV_WARN_LIMIT,
PSC_VOLTAGE_IN, false);
if (info->func[0] & PMBUS_HAVE_STATUS_INPUT) {
pmbus_add_boolean_reg(data, "in", "max_alarm",
in_index,
PB_STATUS_INPUT_BASE,
PB_VOLTAGE_OV_WARNING);
have_alarm = true;
}
}
if (pmbus_check_word_register(client, 0,
PMBUS_VIN_OV_FAULT_LIMIT)) {
i1 = data->num_sensors;
pmbus_add_sensor(data, "in", "crit", in_index,
0, PMBUS_VIN_OV_FAULT_LIMIT,
PSC_VOLTAGE_IN, false);
if (info->func[0] & PMBUS_HAVE_STATUS_INPUT) {
pmbus_add_boolean_reg(data, "in", "crit_alarm",
in_index,
PB_STATUS_INPUT_BASE,
PB_VOLTAGE_OV_FAULT);
have_alarm = true;
}
}
/*
* Add generic alarm attribute only if there are no individual
* attributes.
*/
if (!have_alarm)
pmbus_add_boolean_reg(data, "in", "alarm",
in_index,
PB_STATUS_BASE,
PB_STATUS_VIN_UV);
in_index++;
}
if (info->func[0] & PMBUS_HAVE_VCAP) {
pmbus_add_label(data, "in", in_index, "vcap", 0);
pmbus_add_sensor(data, "in", "input", in_index, 0,
PMBUS_READ_VCAP, PSC_VOLTAGE_IN, true);
in_index++;
}
/*
* Output voltage sensors
*/
for (page = 0; page < info->pages; page++) {
bool have_alarm = false;
if (!(info->func[page] & PMBUS_HAVE_VOUT))
continue;
i0 = data->num_sensors;
pmbus_add_label(data, "in", in_index, "vout", page + 1);
pmbus_add_sensor(data, "in", "input", in_index, page,
PMBUS_READ_VOUT, PSC_VOLTAGE_OUT, true);
if (pmbus_check_word_register(client, page,
PMBUS_VOUT_UV_WARN_LIMIT)) {
i1 = data->num_sensors;
pmbus_add_sensor(data, "in", "min", in_index, page,
PMBUS_VOUT_UV_WARN_LIMIT,
PSC_VOLTAGE_OUT, false);
if (info->func[page] & PMBUS_HAVE_STATUS_VOUT) {
pmbus_add_boolean_reg(data, "in", "min_alarm",
in_index,
PB_STATUS_VOUT_BASE +
page,
PB_VOLTAGE_UV_WARNING);
have_alarm = true;
}
}
if (pmbus_check_word_register(client, page,
PMBUS_VOUT_UV_FAULT_LIMIT)) {
i1 = data->num_sensors;
pmbus_add_sensor(data, "in", "lcrit", in_index, page,
PMBUS_VOUT_UV_FAULT_LIMIT,
PSC_VOLTAGE_OUT, false);
if (info->func[page] & PMBUS_HAVE_STATUS_VOUT) {
pmbus_add_boolean_reg(data, "in", "lcrit_alarm",
in_index,
PB_STATUS_VOUT_BASE +
page,
PB_VOLTAGE_UV_FAULT);
have_alarm = true;
}
}
if (pmbus_check_word_register(client, page,
PMBUS_VOUT_OV_WARN_LIMIT)) {
i1 = data->num_sensors;
pmbus_add_sensor(data, "in", "max", in_index, page,
PMBUS_VOUT_OV_WARN_LIMIT,
PSC_VOLTAGE_OUT, false);
if (info->func[page] & PMBUS_HAVE_STATUS_VOUT) {
pmbus_add_boolean_reg(data, "in", "max_alarm",
in_index,
PB_STATUS_VOUT_BASE +
page,
PB_VOLTAGE_OV_WARNING);
have_alarm = true;
}
}
if (pmbus_check_word_register(client, page,
PMBUS_VOUT_OV_FAULT_LIMIT)) {
i1 = data->num_sensors;
pmbus_add_sensor(data, "in", "crit", in_index, page,
PMBUS_VOUT_OV_FAULT_LIMIT,
PSC_VOLTAGE_OUT, false);
if (info->func[page] & PMBUS_HAVE_STATUS_VOUT) {
pmbus_add_boolean_reg(data, "in", "crit_alarm",
in_index,
PB_STATUS_VOUT_BASE +
page,
PB_VOLTAGE_OV_FAULT);
have_alarm = true;
}
}
/*
* Add generic alarm attribute only if there are no individual
* attributes.
*/
if (!have_alarm)
pmbus_add_boolean_reg(data, "in", "alarm",
in_index,
PB_STATUS_BASE + page,
PB_STATUS_VOUT_OV);
in_index++;
}
/*
* Current sensors
*/
/*
* Input current sensors
*/
in_index = 1;
if (info->func[0] & PMBUS_HAVE_IIN) {
i0 = data->num_sensors;
pmbus_add_label(data, "curr", in_index, "iin", 0);
pmbus_add_sensor(data, "curr", "input", in_index,
0, PMBUS_READ_IIN, PSC_CURRENT_IN, true);
if (pmbus_check_word_register(client, 0,
PMBUS_IIN_OC_WARN_LIMIT)) {
i1 = data->num_sensors;
pmbus_add_sensor(data, "curr", "max", in_index,
0, PMBUS_IIN_OC_WARN_LIMIT,
PSC_CURRENT_IN, false);
if (info->func[0] & PMBUS_HAVE_STATUS_INPUT) {
pmbus_add_boolean_reg(data, "curr", "max_alarm",
in_index,
PB_STATUS_INPUT_BASE,
PB_IIN_OC_WARNING);
}
}
if (pmbus_check_word_register(client, 0,
PMBUS_IIN_OC_FAULT_LIMIT)) {
i1 = data->num_sensors;
pmbus_add_sensor(data, "curr", "crit", in_index,
0, PMBUS_IIN_OC_FAULT_LIMIT,
PSC_CURRENT_IN, false);
if (info->func[0] & PMBUS_HAVE_STATUS_INPUT)
pmbus_add_boolean_reg(data, "curr",
"crit_alarm",
in_index,
PB_STATUS_INPUT_BASE,
PB_IIN_OC_FAULT);
}
in_index++;
}
/*
* Output current sensors
*/
for (page = 0; page < info->pages; page++) {
bool have_alarm = false;
if (!(info->func[page] & PMBUS_HAVE_IOUT))
continue;
i0 = data->num_sensors;
pmbus_add_label(data, "curr", in_index, "iout", page + 1);
pmbus_add_sensor(data, "curr", "input", in_index, page,
PMBUS_READ_IOUT, PSC_CURRENT_OUT, true);
if (pmbus_check_word_register(client, page,
PMBUS_IOUT_OC_WARN_LIMIT)) {
i1 = data->num_sensors;
pmbus_add_sensor(data, "curr", "max", in_index, page,
PMBUS_IOUT_OC_WARN_LIMIT,
PSC_CURRENT_OUT, false);
if (info->func[page] & PMBUS_HAVE_STATUS_IOUT) {
pmbus_add_boolean_reg(data, "curr", "max_alarm",
in_index,
PB_STATUS_IOUT_BASE +
page, PB_IOUT_OC_WARNING);
have_alarm = true;
}
}
if (pmbus_check_word_register(client, page,
PMBUS_IOUT_UC_FAULT_LIMIT)) {
i1 = data->num_sensors;
pmbus_add_sensor(data, "curr", "lcrit", in_index, page,
PMBUS_IOUT_UC_FAULT_LIMIT,
PSC_CURRENT_OUT, false);
if (info->func[page] & PMBUS_HAVE_STATUS_IOUT) {
pmbus_add_boolean_reg(data, "curr",
"lcrit_alarm",
in_index,
PB_STATUS_IOUT_BASE +
page, PB_IOUT_UC_FAULT);
have_alarm = true;
}
}
if (pmbus_check_word_register(client, page,
PMBUS_IOUT_OC_FAULT_LIMIT)) {
i1 = data->num_sensors;
pmbus_add_sensor(data, "curr", "crit", in_index, page,
PMBUS_IOUT_OC_FAULT_LIMIT,
PSC_CURRENT_OUT, false);
if (info->func[page] & PMBUS_HAVE_STATUS_IOUT) {
pmbus_add_boolean_reg(data, "curr",
"crit_alarm",
in_index,
PB_STATUS_IOUT_BASE +
page, PB_IOUT_OC_FAULT);
have_alarm = true;
}
}
/*
* Add generic alarm attribute only if there are no individual
* attributes.
*/
if (!have_alarm)
pmbus_add_boolean_reg(data, "curr", "alarm",
in_index,
PB_STATUS_BASE + page,
PB_STATUS_IOUT_OC);
in_index++;
}
/*
* Power sensors
*/
/*
* Input Power sensors
*/
in_index = 1;
if (info->func[0] & PMBUS_HAVE_PIN) {
i0 = data->num_sensors;
pmbus_add_label(data, "power", in_index, "pin", 0);
pmbus_add_sensor(data, "power", "input", in_index,
0, PMBUS_READ_PIN, PSC_POWER, true);
if (pmbus_check_word_register(client, 0,
PMBUS_PIN_OP_WARN_LIMIT)) {
i1 = data->num_sensors;
pmbus_add_sensor(data, "power", "max", in_index,
0, PMBUS_PIN_OP_WARN_LIMIT, PSC_POWER,
false);
if (info->func[0] & PMBUS_HAVE_STATUS_INPUT)
pmbus_add_boolean_reg(data, "power",
"alarm",
in_index,
PB_STATUS_INPUT_BASE,
PB_PIN_OP_WARNING);
}
in_index++;
}
/*
* Output Power sensors
*/
for (page = 0; page < info->pages; page++) {
bool need_alarm = false;
if (!(info->func[page] & PMBUS_HAVE_POUT))
continue;
i0 = data->num_sensors;
pmbus_add_label(data, "power", in_index, "pout", page + 1);
pmbus_add_sensor(data, "power", "input", in_index, page,
PMBUS_READ_POUT, PSC_POWER, true);
/*
* Per hwmon sysfs API, power_cap is to be used to limit output
* power.
* We have two registers related to maximum output power,
* PMBUS_POUT_MAX and PMBUS_POUT_OP_WARN_LIMIT.
* PMBUS_POUT_MAX matches the powerX_cap attribute definition.
* There is no attribute in the API to match
* PMBUS_POUT_OP_WARN_LIMIT. We use powerX_max for now.
*/
if (pmbus_check_word_register(client, page, PMBUS_POUT_MAX)) {
i1 = data->num_sensors;
pmbus_add_sensor(data, "power", "cap", in_index, page,
PMBUS_POUT_MAX, PSC_POWER, false);
need_alarm = true;
}
if (pmbus_check_word_register(client, page,
PMBUS_POUT_OP_WARN_LIMIT)) {
i1 = data->num_sensors;
pmbus_add_sensor(data, "power", "max", in_index, page,
PMBUS_POUT_OP_WARN_LIMIT, PSC_POWER,
false);
need_alarm = true;
}
if (need_alarm && (info->func[page] & PMBUS_HAVE_STATUS_IOUT))
pmbus_add_boolean_reg(data, "power", "alarm",
in_index,
PB_STATUS_IOUT_BASE + page,
PB_POUT_OP_WARNING
| PB_POWER_LIMITING);
if (pmbus_check_word_register(client, page,
PMBUS_POUT_OP_FAULT_LIMIT)) {
i1 = data->num_sensors;
pmbus_add_sensor(data, "power", "crit", in_index, page,
PMBUS_POUT_OP_FAULT_LIMIT, PSC_POWER,
false);
if (info->func[page] & PMBUS_HAVE_STATUS_IOUT)
pmbus_add_boolean_reg(data, "power",
"crit_alarm",
in_index,
PB_STATUS_IOUT_BASE
+ page,
PB_POUT_OP_FAULT);
}
in_index++;
}
/*
* Temperature sensors
*/
in_index = 1;
for (page = 0; page < info->pages; page++) {
int t;
for (t = 0; t < ARRAY_SIZE(pmbus_temp_registers); t++) {
bool have_alarm = false;
/*
* A PMBus chip may support any combination of
* temperature registers on any page. So we can not
* abort after a failure to detect a register, but have
* to continue checking for all registers on all pages.
*/
if (!(info->func[page] & pmbus_temp_flags[t]))
continue;
if (!pmbus_check_word_register
(client, page, pmbus_temp_registers[t]))
continue;
i0 = data->num_sensors;
pmbus_add_sensor(data, "temp", "input", in_index, page,
pmbus_temp_registers[t],
PSC_TEMPERATURE, true);
/*
* PMBus provides only one status register for TEMP1-3.
* Thus, we can not use the status register to determine
* which of the three sensors actually caused an alarm.
* Always compare current temperature against the limit
* registers to determine alarm conditions for a
* specific sensor.
*
* Since there is only one set of limit registers for
* up to three temperature sensors, we need to update
* all limit registers after the limit was changed for
* one of the sensors. This ensures that correct limits
* are reported for all temperature sensors.
*/
if (pmbus_check_word_register
(client, page, PMBUS_UT_WARN_LIMIT)) {
i1 = data->num_sensors;
pmbus_add_sensor(data, "temp", "min", in_index,
page, PMBUS_UT_WARN_LIMIT,
PSC_TEMPERATURE, true);
if (info->func[page] & PMBUS_HAVE_STATUS_TEMP) {
pmbus_add_boolean_cmp(data, "temp",
"min_alarm", in_index, i1, i0,
PB_STATUS_TEMP_BASE + page,
PB_TEMP_UT_WARNING);
have_alarm = true;
}
}
if (pmbus_check_word_register(client, page,
PMBUS_UT_FAULT_LIMIT)) {
i1 = data->num_sensors;
pmbus_add_sensor(data, "temp", "lcrit",
in_index, page,
PMBUS_UT_FAULT_LIMIT,
PSC_TEMPERATURE, true);
if (info->func[page] & PMBUS_HAVE_STATUS_TEMP) {
pmbus_add_boolean_cmp(data, "temp",
"lcrit_alarm", in_index, i1, i0,
PB_STATUS_TEMP_BASE + page,
PB_TEMP_UT_FAULT);
have_alarm = true;
}
}
if (pmbus_check_word_register
(client, page, PMBUS_OT_WARN_LIMIT)) {
i1 = data->num_sensors;
pmbus_add_sensor(data, "temp", "max", in_index,
page, PMBUS_OT_WARN_LIMIT,
PSC_TEMPERATURE, true);
if (info->func[page] & PMBUS_HAVE_STATUS_TEMP) {
pmbus_add_boolean_cmp(data, "temp",
"max_alarm", in_index, i0, i1,
PB_STATUS_TEMP_BASE + page,
PB_TEMP_OT_WARNING);
have_alarm = true;
}
}
if (pmbus_check_word_register(client, page,
PMBUS_OT_FAULT_LIMIT)) {
i1 = data->num_sensors;
pmbus_add_sensor(data, "temp", "crit", in_index,
page, PMBUS_OT_FAULT_LIMIT,
PSC_TEMPERATURE, true);
if (info->func[page] & PMBUS_HAVE_STATUS_TEMP) {
pmbus_add_boolean_cmp(data, "temp",
"crit_alarm", in_index, i0, i1,
PB_STATUS_TEMP_BASE + page,
PB_TEMP_OT_FAULT);
have_alarm = true;
}
}
/*
* Last resort - we were not able to create any alarm
* registers. Report alarm for all sensors using the
* status register temperature alarm bit.
*/
if (!have_alarm)
pmbus_add_boolean_reg(data, "temp", "alarm",
in_index,
PB_STATUS_BASE + page,
PB_STATUS_TEMPERATURE);
in_index++;
}
}
/*
* Fans
*/
in_index = 1;
for (page = 0; page < info->pages; page++) {
int f;
for (f = 0; f < ARRAY_SIZE(pmbus_fan_registers); f++) {
int regval;
if (!(info->func[page] & pmbus_fan_flags[f]))
break;
if (!pmbus_check_word_register(client, page,
pmbus_fan_registers[f])
|| !pmbus_check_byte_register(client, page,
pmbus_fan_config_registers[f]))
break;
/*
* Skip fan if not installed.
* Each fan configuration register covers multiple fans,
* so we have to do some magic.
*/
regval = pmbus_read_byte_data(client, page,
pmbus_fan_config_registers[f]);
if (regval < 0 ||
(!(regval & (PB_FAN_1_INSTALLED >> ((f & 1) * 4)))))
continue;
i0 = data->num_sensors;
pmbus_add_sensor(data, "fan", "input", in_index, page,
pmbus_fan_registers[f], PSC_FAN, true);
/*
* Each fan status register covers multiple fans,
* so we have to do some magic.
*/
if ((info->func[page] & pmbus_fan_status_flags[f]) &&
pmbus_check_byte_register(client,
page, pmbus_fan_status_registers[f])) {
int base;
if (f > 1) /* fan 3, 4 */
base = PB_STATUS_FAN34_BASE + page;
else
base = PB_STATUS_FAN_BASE + page;
pmbus_add_boolean_reg(data, "fan", "alarm",
in_index, base,
PB_FAN_FAN1_WARNING >> (f & 1));
pmbus_add_boolean_reg(data, "fan", "fault",
in_index, base,
PB_FAN_FAN1_FAULT >> (f & 1));
}
in_index++;
}
}
}
/*
* Identify chip parameters.
* This function is called for all chips.
*/
static int pmbus_identify_common(struct i2c_client *client,
struct pmbus_data *data)
{
int vout_mode = -1, exponent;
if (pmbus_check_byte_register(client, 0, PMBUS_VOUT_MODE))
vout_mode = pmbus_read_byte_data(client, 0, PMBUS_VOUT_MODE);
if (vout_mode >= 0 && vout_mode != 0xff) {
/*
* Not all chips support the VOUT_MODE command,
* so a failure to read it is not an error.
*/
switch (vout_mode >> 5) {
case 0: /* linear mode */
if (data->info->direct[PSC_VOLTAGE_OUT])
return -ENODEV;
exponent = vout_mode & 0x1f;
/* and sign-extend it */
if (exponent & 0x10)
exponent |= ~0x1f;
data->exponent = exponent;
break;
case 2: /* direct mode */
if (!data->info->direct[PSC_VOLTAGE_OUT])
return -ENODEV;
break;
default:
return -ENODEV;
}
}
/* Determine maximum number of sensors, booleans, and labels */
pmbus_find_max_attr(client, data);
pmbus_clear_fault_page(client, 0);
return 0;
}
int pmbus_do_probe(struct i2c_client *client, const struct i2c_device_id *id,
struct pmbus_driver_info *info)
{
const struct pmbus_platform_data *pdata = client->dev.platform_data;
struct pmbus_data *data;
int ret;
if (!info) {
dev_err(&client->dev, "Missing chip information");
return -ENODEV;
}
if (!i2c_check_functionality(client->adapter, I2C_FUNC_SMBUS_WRITE_BYTE
| I2C_FUNC_SMBUS_BYTE_DATA
| I2C_FUNC_SMBUS_WORD_DATA))
return -ENODEV;
data = kzalloc(sizeof(*data), GFP_KERNEL);
if (!data) {
dev_err(&client->dev, "No memory to allocate driver data\n");
return -ENOMEM;
}
i2c_set_clientdata(client, data);
mutex_init(&data->update_lock);
/*
* Bail out if status register or PMBus revision register
* does not exist.
*/
if (i2c_smbus_read_byte_data(client, PMBUS_STATUS_BYTE) < 0
|| i2c_smbus_read_byte_data(client, PMBUS_REVISION) < 0) {
dev_err(&client->dev,
"Status or revision register not found\n");
ret = -ENODEV;
goto out_data;
}
if (pdata)
data->flags = pdata->flags;
data->info = info;
pmbus_clear_faults(client);
if (info->identify) {
ret = (*info->identify)(client, info);
if (ret < 0) {
dev_err(&client->dev, "Chip identification failed\n");
goto out_data;
}
}
if (info->pages <= 0 || info->pages > PMBUS_PAGES) {
dev_err(&client->dev, "Bad number of PMBus pages: %d\n",
info->pages);
ret = -EINVAL;
goto out_data;
}
/*
* Bail out if more than one page was configured, but we can not
* select the highest page. This is an indication that the wrong
* chip type was selected. Better bail out now than keep
* returning errors later on.
*/
if (info->pages > 1 && pmbus_set_page(client, info->pages - 1) < 0) {
dev_err(&client->dev, "Failed to select page %d\n",
info->pages - 1);
ret = -EINVAL;
goto out_data;
}
ret = pmbus_identify_common(client, data);
if (ret < 0) {
dev_err(&client->dev, "Failed to identify chip capabilities\n");
goto out_data;
}
ret = -ENOMEM;
data->sensors = kzalloc(sizeof(struct pmbus_sensor) * data->max_sensors,
GFP_KERNEL);
if (!data->sensors) {
dev_err(&client->dev, "No memory to allocate sensor data\n");
goto out_data;
}
data->booleans = kzalloc(sizeof(struct pmbus_boolean)
* data->max_booleans, GFP_KERNEL);
if (!data->booleans) {
dev_err(&client->dev, "No memory to allocate boolean data\n");
goto out_sensors;
}
data->labels = kzalloc(sizeof(struct pmbus_label) * data->max_labels,
GFP_KERNEL);
if (!data->labels) {
dev_err(&client->dev, "No memory to allocate label data\n");
goto out_booleans;
}
data->attributes = kzalloc(sizeof(struct attribute *)
* data->max_attributes, GFP_KERNEL);
if (!data->attributes) {
dev_err(&client->dev, "No memory to allocate attribute data\n");
goto out_labels;
}
pmbus_find_attributes(client, data);
/*
* If there are no attributes, something is wrong.
* Bail out instead of trying to register nothing.
*/
if (!data->num_attributes) {
dev_err(&client->dev, "No attributes found\n");
ret = -ENODEV;
goto out_attributes;
}
/* Register sysfs hooks */
data->group.attrs = data->attributes;
ret = sysfs_create_group(&client->dev.kobj, &data->group);
if (ret) {
dev_err(&client->dev, "Failed to create sysfs entries\n");
goto out_attributes;
}
data->hwmon_dev = hwmon_device_register(&client->dev);
if (IS_ERR(data->hwmon_dev)) {
ret = PTR_ERR(data->hwmon_dev);
dev_err(&client->dev, "Failed to register hwmon device\n");
goto out_hwmon_device_register;
}
return 0;
out_hwmon_device_register:
sysfs_remove_group(&client->dev.kobj, &data->group);
out_attributes:
kfree(data->attributes);
out_labels:
kfree(data->labels);
out_booleans:
kfree(data->booleans);
out_sensors:
kfree(data->sensors);
out_data:
kfree(data);
return ret;
}
EXPORT_SYMBOL_GPL(pmbus_do_probe);
int pmbus_do_remove(struct i2c_client *client)
{
struct pmbus_data *data = i2c_get_clientdata(client);
hwmon_device_unregister(data->hwmon_dev);
sysfs_remove_group(&client->dev.kobj, &data->group);
kfree(data->attributes);
kfree(data->labels);
kfree(data->booleans);
kfree(data->sensors);
kfree(data);
return 0;
}
EXPORT_SYMBOL_GPL(pmbus_do_remove);
MODULE_AUTHOR("Guenter Roeck");
MODULE_DESCRIPTION("PMBus core driver");
MODULE_LICENSE("GPL");
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