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pmbus_core.c
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pmbus_core.c
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/*
* Hardware monitoring driver for PMBus devices
*
* Copyright (c) 2010, 2011 Ericsson AB.
* Copyright (c) 2012 Guenter Roeck
*
* 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/debugfs.h>
#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/jiffies.h>
#include <linux/i2c/pmbus.h>
#include <linux/regulator/driver.h>
#include <linux/regulator/machine.h>
#include "pmbus.h"
/*
* Number of additional attribute pointers to allocate
* with each call to krealloc
*/
#define PMBUS_ATTR_ALLOC_SIZE 32
/*
* 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_TEMP_BASE (PB_STATUS_FAN34_BASE + PMBUS_PAGES)
#define PB_STATUS_INPUT_BASE (PB_STATUS_TEMP_BASE + PMBUS_PAGES)
#define PB_STATUS_VMON_BASE (PB_STATUS_INPUT_BASE + 1)
#define PB_NUM_STATUS_REG (PB_STATUS_VMON_BASE + 1)
#define PMBUS_NAME_SIZE 24
struct pmbus_sensor {
struct pmbus_sensor *next;
char name[PMBUS_NAME_SIZE]; /* sysfs sensor name */
struct device_attribute attribute;
u8 page; /* page number */
u16 reg; /* register */
enum pmbus_sensor_classes class; /* sensor class */
bool update; /* runtime sensor update needed */
bool convert; /* Whether or not to apply linear/vid/direct */
int data; /* Sensor data.
Negative if there was a read error */
};
#define to_pmbus_sensor(_attr) \
container_of(_attr, struct pmbus_sensor, attribute)
struct pmbus_boolean {
char name[PMBUS_NAME_SIZE]; /* sysfs boolean name */
struct sensor_device_attribute attribute;
struct pmbus_sensor *s1;
struct pmbus_sensor *s2;
};
#define to_pmbus_boolean(_attr) \
container_of(_attr, struct pmbus_boolean, attribute)
struct pmbus_label {
char name[PMBUS_NAME_SIZE]; /* sysfs label name */
struct device_attribute attribute;
char label[PMBUS_NAME_SIZE]; /* label */
};
#define to_pmbus_label(_attr) \
container_of(_attr, struct pmbus_label, attribute)
struct pmbus_data {
struct device *dev;
struct device *hwmon_dev;
u32 flags; /* from platform data */
int exponent[PMBUS_PAGES];
/* linear mode: exponent for output voltages */
const struct pmbus_driver_info *info;
int max_attributes;
int num_attributes;
struct attribute_group group;
const struct attribute_group *groups[2];
struct dentry *debugfs; /* debugfs device directory */
struct pmbus_sensor *sensors;
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.
*/
u16 status[PB_NUM_STATUS_REG];
bool has_status_word; /* device uses STATUS_WORD register */
int (*read_status)(struct i2c_client *client, int page);
u8 currpage;
};
static const int pmbus_fan_rpm_mask[] = {
PB_FAN_1_RPM,
PB_FAN_2_RPM,
PB_FAN_1_RPM,
PB_FAN_2_RPM,
};
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_command_registers[] = {
PMBUS_FAN_COMMAND_1,
PMBUS_FAN_COMMAND_2,
PMBUS_FAN_COMMAND_3,
PMBUS_FAN_COMMAND_4,
};
struct pmbus_debugfs_entry {
struct i2c_client *client;
u8 page;
u8 reg;
};
void pmbus_clear_cache(struct i2c_client *client)
{
struct pmbus_data *data = i2c_get_clientdata(client);
data->valid = false;
}
EXPORT_SYMBOL_GPL(pmbus_clear_cache);
int pmbus_set_page(struct i2c_client *client, int page)
{
struct pmbus_data *data = i2c_get_clientdata(client);
int rv = 0;
int newpage;
if (page == data->currpage || page < 0)
return 0;
if (!(data->info->func[page] & PMBUS_PAGE_VIRTUAL)) {
dev_dbg(&client->dev, "Want page %u, %u cached\n", page,
data->currpage);
rv = i2c_smbus_write_byte_data(client, PMBUS_PAGE, page);
if (rv) {
rv = i2c_smbus_write_byte_data(client, PMBUS_PAGE,
page);
dev_dbg(&client->dev,
"Failed to set page %u, performed one-shot retry %s: %d\n",
page, rv ? "and failed" : "with success", rv);
}
newpage = i2c_smbus_read_byte_data(client, PMBUS_PAGE);
if (newpage != page)
return -EIO;
}
data->currpage = page;
return rv;
}
EXPORT_SYMBOL_GPL(pmbus_set_page);
int pmbus_write_byte(struct i2c_client *client, int page, u8 value)
{
int rv;
rv = pmbus_set_page(client, page);
if (rv < 0)
return rv;
return i2c_smbus_write_byte(client, value);
}
EXPORT_SYMBOL_GPL(pmbus_write_byte);
/*
* _pmbus_write_byte() is similar to pmbus_write_byte(), but checks if
* a device specific mapping function exists and calls it if necessary.
*/
static int _pmbus_write_byte(struct i2c_client *client, int page, u8 value)
{
struct pmbus_data *data = i2c_get_clientdata(client);
const struct pmbus_driver_info *info = data->info;
int status;
if (info->write_byte) {
status = info->write_byte(client, page, value);
if (status != -ENODATA)
return status;
}
return pmbus_write_byte(client, page, value);
}
int pmbus_write_word_data(struct i2c_client *client, int 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);
}
EXPORT_SYMBOL_GPL(pmbus_write_word_data);
int pmbus_update_fan(struct i2c_client *client, int page, int id,
u8 config, u8 mask, u16 command)
{
int from, rv;
u8 to;
from = pmbus_read_byte_data(client, page,
pmbus_fan_config_registers[id]);
if (from < 0)
return from;
to = (from & ~mask) | (config & mask);
rv = pmbus_write_byte_data(client, page,
pmbus_fan_config_registers[id], to);
if (rv < 0)
return rv;
return pmbus_write_word_data(client, page,
pmbus_fan_command_registers[id], command);
}
EXPORT_SYMBOL_GPL(pmbus_update_fan);
/*
* _pmbus_write_word_data() is similar to pmbus_write_word_data(), but checks if
* a device specific mapping function exists and calls it if necessary.
*/
static int _pmbus_write_word_data(struct i2c_client *client, int page, int reg,
u16 word)
{
struct pmbus_data *data = i2c_get_clientdata(client);
const struct pmbus_driver_info *info = data->info;
int status;
if (info->write_word_data) {
status = info->write_word_data(client, page, reg, word);
if (status != -ENODATA)
return status;
}
if (reg >= PMBUS_VIRT_BASE) {
int id, bit;
switch (reg) {
case PMBUS_VIRT_FAN_TARGET_1:
case PMBUS_VIRT_FAN_TARGET_2:
case PMBUS_VIRT_FAN_TARGET_3:
case PMBUS_VIRT_FAN_TARGET_4:
id = reg - PMBUS_VIRT_FAN_TARGET_1;
bit = pmbus_fan_rpm_mask[id];
status = pmbus_update_fan(client, page, id, bit, bit,
word);
break;
case PMBUS_VIRT_PWM_1:
case PMBUS_VIRT_PWM_2:
case PMBUS_VIRT_PWM_3:
case PMBUS_VIRT_PWM_4:
{
u32 command = word;
id = reg - PMBUS_VIRT_PWM_1;
bit = pmbus_fan_rpm_mask[id];
command *= 100;
command /= 255;
status = pmbus_update_fan(client, page, id, 0, bit,
command);
break;
}
default:
status = -ENXIO;
break;
}
return status;
}
return pmbus_write_word_data(client, page, reg, word);
}
int pmbus_read_word_data(struct i2c_client *client, int 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_get_fan_command(struct i2c_client *client, int page, int id,
enum pmbus_fan_mode mode);
/*
* _pmbus_read_word_data() is similar to pmbus_read_word_data(), but checks if
* a device specific mapping function exists and calls it if necessary.
*/
static int _pmbus_read_word_data(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->read_word_data) {
status = info->read_word_data(client, page, reg);
if (status != -ENODATA)
return status;
}
if (reg >= PMBUS_VIRT_BASE) {
int id;
switch (reg) {
case PMBUS_VIRT_FAN_TARGET_1:
case PMBUS_VIRT_FAN_TARGET_2:
case PMBUS_VIRT_FAN_TARGET_3:
case PMBUS_VIRT_FAN_TARGET_4:
id = reg - PMBUS_VIRT_FAN_TARGET_1;
status = pmbus_get_fan_command(client, page, id, rpm);
break;
case PMBUS_VIRT_PWM_1:
case PMBUS_VIRT_PWM_2:
case PMBUS_VIRT_PWM_3:
case PMBUS_VIRT_PWM_4:
{
int rv;
id = reg - PMBUS_VIRT_PWM_1;
rv = pmbus_get_fan_command(client, page, id, percent);
if (rv < 0)
return rv;
rv *= 255;
rv /= 100;
status = rv;
break;
}
default:
status = -ENXIO;
break;
}
return status;
}
return pmbus_read_word_data(client, page, reg);
}
int pmbus_read_byte_data(struct i2c_client *client, int page, u8 reg)
{
int rv;
rv = pmbus_set_page(client, page);
if (rv < 0)
return rv;
return i2c_smbus_read_byte_data(client, reg);
}
EXPORT_SYMBOL_GPL(pmbus_read_byte_data);
int pmbus_write_byte_data(struct i2c_client *client, int page, u8 reg, u8 value)
{
int rv;
rv = pmbus_set_page(client, page);
if (rv < 0)
return rv;
return i2c_smbus_write_byte_data(client, reg, value);
}
EXPORT_SYMBOL_GPL(pmbus_write_byte_data);
int pmbus_update_byte_data(struct i2c_client *client, int page, u8 reg,
u8 mask, u8 value)
{
unsigned int tmp;
int rv;
rv = pmbus_read_byte_data(client, page, reg);
if (rv < 0)
return rv;
tmp = (rv & ~mask) | (value & mask);
if (tmp != rv)
rv = pmbus_write_byte_data(client, page, reg, tmp);
return rv;
}
EXPORT_SYMBOL_GPL(pmbus_update_byte_data);
/*
* _pmbus_read_byte_data() is similar to pmbus_read_byte_data(), but checks if
* a device specific mapping function exists and calls it if necessary.
*/
static int _pmbus_read_byte_data(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->read_byte_data) {
status = info->read_byte_data(client, page, reg);
if (status != -ENODATA)
return status;
}
return pmbus_read_byte_data(client, page, reg);
}
static int pmbus_get_fan_command(struct i2c_client *client, int page, int id,
enum pmbus_fan_mode mode)
{
int config;
config = _pmbus_read_byte_data(client, page,
pmbus_fan_config_registers[id]);
if (config < 0)
return config;
/*
* We can't meaningfully translate between PWM and RPM, so if the
* attribute mode (fan[1-*]_target is RPM, pwm[1-*] and pwm[1-*]_enable
* are PWM) doesn't match the hardware mode, then report 0 instead.
*/
if ((mode == rpm) != (!!(config & pmbus_fan_rpm_mask[id])))
return 0;
return _pmbus_read_word_data(client, page,
pmbus_fan_command_registers[id]);
}
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)
{
struct pmbus_data *data = i2c_get_clientdata(client);
int status, status2;
status = data->read_status(client, -1);
if (status < 0 || (status & PB_STATUS_CML)) {
status2 = _pmbus_read_byte_data(client, -1, PMBUS_STATUS_CML);
if (status2 < 0 || (status2 & PB_CML_FAULT_INVALID_COMMAND))
return -EIO;
}
return 0;
}
static bool pmbus_check_register(struct i2c_client *client,
int (*func)(struct i2c_client *client,
int page, int reg),
int page, int reg)
{
int rv;
struct pmbus_data *data = i2c_get_clientdata(client);
rv = func(client, page, reg);
if (rv >= 0 && !(data->flags & PMBUS_SKIP_STATUS_CHECK))
rv = pmbus_check_status_cml(client);
pmbus_clear_fault_page(client, -1);
return rv >= 0;
}
static bool pmbus_check_status_register(struct i2c_client *client, int page)
{
int status;
struct pmbus_data *data = i2c_get_clientdata(client);
status = data->read_status(client, page);
if (status >= 0 && !(data->flags & PMBUS_SKIP_STATUS_CHECK) &&
(status & PB_STATUS_CML)) {
status = _pmbus_read_byte_data(client, -1, PMBUS_STATUS_CML);
if (status < 0 || (status & PB_CML_FAULT_INVALID_COMMAND))
status = -EIO;
}
pmbus_clear_fault_page(client, -1);
return status >= 0;
}
bool pmbus_check_byte_register(struct i2c_client *client, int page, int reg)
{
return pmbus_check_register(client, _pmbus_read_byte_data, page, reg);
}
EXPORT_SYMBOL_GPL(pmbus_check_byte_register);
bool pmbus_check_word_register(struct i2c_client *client, int page, int reg)
{
return pmbus_check_register(client, _pmbus_read_word_data, page, reg);
}
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 struct _pmbus_status {
u32 func;
u16 base;
u16 reg;
} pmbus_status[] = {
{ PMBUS_HAVE_STATUS_VOUT, PB_STATUS_VOUT_BASE, PMBUS_STATUS_VOUT },
{ PMBUS_HAVE_STATUS_IOUT, PB_STATUS_IOUT_BASE, PMBUS_STATUS_IOUT },
{ PMBUS_HAVE_STATUS_TEMP, PB_STATUS_TEMP_BASE,
PMBUS_STATUS_TEMPERATURE },
{ PMBUS_HAVE_STATUS_FAN12, PB_STATUS_FAN_BASE, PMBUS_STATUS_FAN_12 },
{ PMBUS_HAVE_STATUS_FAN34, PB_STATUS_FAN34_BASE, PMBUS_STATUS_FAN_34 },
};
static struct pmbus_data *pmbus_update_device(struct device *dev)
{
struct i2c_client *client = to_i2c_client(dev->parent);
struct pmbus_data *data = i2c_get_clientdata(client);
const struct pmbus_driver_info *info = data->info;
struct pmbus_sensor *sensor;
mutex_lock(&data->update_lock);
if (time_after(jiffies, data->last_updated + HZ) || !data->valid) {
int i, j;
for (i = 0; i < info->pages; i++) {
data->status[PB_STATUS_BASE + i]
= data->read_status(client, i);
for (j = 0; j < ARRAY_SIZE(pmbus_status); j++) {
struct _pmbus_status *s = &pmbus_status[j];
if (!(info->func[i] & s->func))
continue;
data->status[s->base + i]
= _pmbus_read_byte_data(client, i,
s->reg);
}
}
if (info->func[0] & PMBUS_HAVE_STATUS_INPUT)
data->status[PB_STATUS_INPUT_BASE]
= _pmbus_read_byte_data(client, 0,
PMBUS_STATUS_INPUT);
if (info->func[0] & PMBUS_HAVE_STATUS_VMON)
data->status[PB_STATUS_VMON_BASE]
= _pmbus_read_byte_data(client, 0,
PMBUS_VIRT_STATUS_VMON);
for (sensor = data->sensors; sensor; sensor = sensor->next) {
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 long 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[sensor->page];
mantissa = (u16) sensor->data;
} else { /* LINEAR11 */
exponent = ((s16)sensor->data) >> 11;
mantissa = ((s16)((sensor->data & 0x7ff) << 5)) >> 5;
}
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 val;
}
/*
* Convert direct sensor values to milli- or micro-units
* depending on sensor type.
*/
static long 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 || sensor->class == PSC_PWM)) {
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 (val - b) / m;
}
/*
* Convert VID sensor values to milli- or micro-units
* depending on sensor type.
*/
static long pmbus_reg2data_vid(struct pmbus_data *data,
struct pmbus_sensor *sensor)
{
long val = sensor->data;
long rv = 0;
switch (data->info->vrm_version) {
case vr11:
if (val >= 0x02 && val <= 0xb2)
rv = DIV_ROUND_CLOSEST(160000 - (val - 2) * 625, 100);
break;
case vr12:
if (val >= 0x01)
rv = 250 + (val - 1) * 5;
break;
}
return rv;
}
static long pmbus_reg2data(struct pmbus_data *data, struct pmbus_sensor *sensor)
{
long val;
if (!sensor->convert)
return sensor->data;
switch (data->info->format[sensor->class]) {
case direct:
val = pmbus_reg2data_direct(data, sensor);
break;
case vid:
val = pmbus_reg2data_vid(data, sensor);
break;
case linear:
default:
val = pmbus_reg2data_linear(data, sensor);
break;
}
return val;
}
#define MAX_MANTISSA (1023 * 1000)
#define MIN_MANTISSA (511 * 1000)
static u16 pmbus_data2reg_linear(struct pmbus_data *data,
struct pmbus_sensor *sensor, long val)
{
s16 exponent = 0, mantissa;
bool negative = false;
/* simple case */
if (val == 0)
return 0;
if (sensor->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[sensor->page] < 0)
val <<= -data->exponent[sensor->page];
else
val >>= data->exponent[sensor->page];
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 (sensor->class == PSC_POWER)
val = DIV_ROUND_CLOSEST(val, 1000L);
/*
* For simplicity, convert fan data to milli-units
* before calculating the exponent.
*/
if (sensor->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,
struct pmbus_sensor *sensor, long val)
{
long m, b, R;
m = data->info->m[sensor->class];
b = data->info->b[sensor->class];
R = data->info->R[sensor->class];
/* Power is in uW. Adjust R and b. */
if (sensor->class == PSC_POWER) {
R -= 3;
b *= 1000;
}
/* Calculate Y = (m * X + b) * 10^R */
if (!(sensor->class == PSC_FAN || sensor->class == PSC_PWM)) {
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_vid(struct pmbus_data *data,
struct pmbus_sensor *sensor, long val)
{
val = clamp_val(val, 500, 1600);
return 2 + DIV_ROUND_CLOSEST((1600 - val) * 100, 625);
}
static u16 pmbus_data2reg(struct pmbus_data *data,
struct pmbus_sensor *sensor, long val)
{
u16 regval;
if (!sensor->convert)
return val;
switch (data->info->format[sensor->class]) {
case direct:
regval = pmbus_data2reg_direct(data, sensor, val);
break;
case vid:
regval = pmbus_data2reg_vid(data, sensor, val);
break;
case linear:
default:
regval = pmbus_data2reg_linear(data, sensor, val);
break;
}
return regval;
}
/*
* Return boolean calculated from converted data.
* <index> defines a status register index and mask.
* The mask is in the lower 8 bits, the register index is in bits 8..23.
*
* The associated pmbus_boolean structure contains optional pointers to two
* sensor attributes. If specified, those attributes are compared against each
* other to determine if a limit has been exceeded.
*
* If the sensor attribute pointers are NULL, the function returns true if
* (status[reg] & mask) is true.
*
* If sensor attribute pointers are provided, 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 attribute pointers 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, struct pmbus_boolean *b,
int index)
{
struct pmbus_sensor *s1 = b->s1;
struct pmbus_sensor *s2 = b->s2;
u16 reg = (index >> 16) & 0xffff;
u16 mask = index & 0xffff;
int ret, status;
u16 regval;
status = data->status[reg];
if (status < 0)
return status;
regval = status & mask;
if (!s1 && !s2) {
ret = !!regval;
} else if (!s1 || !s2) {
WARN(1, "Bad boolean descriptor %p: s1=%p, s2=%p\n", b, s1, s2);
return 0;
} else {
long v1, v2;
if (s1->data < 0)
return s1->data;
if (s2->data < 0)
return s2->data;
v1 = pmbus_reg2data(data, s1);
v2 = pmbus_reg2data(data, s2);
ret = !!(regval && v1 >= v2);
}
return ret;
}
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_boolean *boolean = to_pmbus_boolean(attr);
struct pmbus_data *data = pmbus_update_device(dev);
int val;
val = pmbus_get_boolean(data, boolean, attr->index);
if (val < 0)
return val;
return snprintf(buf, PAGE_SIZE, "%d\n", val);
}
static ssize_t pmbus_show_sensor(struct device *dev,
struct device_attribute *devattr, char *buf)
{
struct pmbus_data *data = pmbus_update_device(dev);
struct pmbus_sensor *sensor = to_pmbus_sensor(devattr);
if (sensor->data < 0)
return sensor->data;
return snprintf(buf, PAGE_SIZE, "%ld\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 i2c_client *client = to_i2c_client(dev->parent);
struct pmbus_data *data = i2c_get_clientdata(client);
struct pmbus_sensor *sensor = to_pmbus_sensor(devattr);
ssize_t rv = count;
long val = 0;
int ret;
u16 regval;
if (kstrtol(buf, 10, &val) < 0)
return -EINVAL;
mutex_lock(&data->update_lock);
regval = pmbus_data2reg(data, sensor, val);
ret = _pmbus_write_word_data(client, sensor->page, sensor->reg, regval);
if (ret < 0)
rv = ret;
else
sensor->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 pmbus_label *label = to_pmbus_label(da);
return snprintf(buf, PAGE_SIZE, "%s\n", label->label);
}
static int pmbus_add_attribute(struct pmbus_data *data, struct attribute *attr)
{
if (data->num_attributes >= data->max_attributes - 1) {
int new_max_attrs = data->max_attributes + PMBUS_ATTR_ALLOC_SIZE;
void *new_attrs = krealloc(data->group.attrs,
new_max_attrs * sizeof(void *),
GFP_KERNEL);
if (!new_attrs)
return -ENOMEM;
data->group.attrs = new_attrs;
data->max_attributes = new_max_attrs;
}