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linux-next/drivers/hwmon/ltc2945.c
Stephen Kitt 6748703856 hwmon: use simple i2c probe function 
Many hwmon drivers don't use the id information provided by the old
i2c probe function, and the remainder can easily be adapted to the new
form ("probe_new") by calling i2c_match_id explicitly.

This avoids scanning the identifier tables during probes.

Drivers which didn't use the id are converted as-is; drivers which did
are modified as follows:

* if the information in i2c_client is sufficient, that's used instead
  (client->name);
* anything else is handled by calling i2c_match_id() with the same
  level of error-handling (if any) as before.

A few drivers aren't included in this patch because they have a
different set of maintainers. They will be covered by other patches.

Signed-off-by: Stephen Kitt <steve@sk2.org>
Link: https://lore.kernel.org/r/20200813160222.1503401-1-steve@sk2.org
Signed-off-by: Guenter Roeck <linux@roeck-us.net>
2020-09-23 09:42:39 -07:00

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// SPDX-License-Identifier: GPL-2.0-or-later
/*
* Driver for Linear Technology LTC2945 I2C Power Monitor
*
* Copyright (c) 2014 Guenter Roeck
*/
#include <linux/kernel.h>
#include <linux/module.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/regmap.h>
/* chip registers */
#define LTC2945_CONTROL 0x00
#define LTC2945_ALERT 0x01
#define LTC2945_STATUS 0x02
#define LTC2945_FAULT 0x03
#define LTC2945_POWER_H 0x05
#define LTC2945_MAX_POWER_H 0x08
#define LTC2945_MIN_POWER_H 0x0b
#define LTC2945_MAX_POWER_THRES_H 0x0e
#define LTC2945_MIN_POWER_THRES_H 0x11
#define LTC2945_SENSE_H 0x14
#define LTC2945_MAX_SENSE_H 0x16
#define LTC2945_MIN_SENSE_H 0x18
#define LTC2945_MAX_SENSE_THRES_H 0x1a
#define LTC2945_MIN_SENSE_THRES_H 0x1c
#define LTC2945_VIN_H 0x1e
#define LTC2945_MAX_VIN_H 0x20
#define LTC2945_MIN_VIN_H 0x22
#define LTC2945_MAX_VIN_THRES_H 0x24
#define LTC2945_MIN_VIN_THRES_H 0x26
#define LTC2945_ADIN_H 0x28
#define LTC2945_MAX_ADIN_H 0x2a
#define LTC2945_MIN_ADIN_H 0x2c
#define LTC2945_MAX_ADIN_THRES_H 0x2e
#define LTC2945_MIN_ADIN_THRES_H 0x30
#define LTC2945_MIN_ADIN_THRES_L 0x31
/* Fault register bits */
#define FAULT_ADIN_UV (1 << 0)
#define FAULT_ADIN_OV (1 << 1)
#define FAULT_VIN_UV (1 << 2)
#define FAULT_VIN_OV (1 << 3)
#define FAULT_SENSE_UV (1 << 4)
#define FAULT_SENSE_OV (1 << 5)
#define FAULT_POWER_UV (1 << 6)
#define FAULT_POWER_OV (1 << 7)
/* Control register bits */
#define CONTROL_MULT_SELECT (1 << 0)
#define CONTROL_TEST_MODE (1 << 4)
static inline bool is_power_reg(u8 reg)
{
return reg < LTC2945_SENSE_H;
}
/* Return the value from the given register in uW, mV, or mA */
static long long ltc2945_reg_to_val(struct device *dev, u8 reg)
{
struct regmap *regmap = dev_get_drvdata(dev);
unsigned int control;
u8 buf[3];
long long val;
int ret;
ret = regmap_bulk_read(regmap, reg, buf,
is_power_reg(reg) ? 3 : 2);
if (ret < 0)
return ret;
if (is_power_reg(reg)) {
/* power */
val = (buf[0] << 16) + (buf[1] << 8) + buf[2];
} else {
/* current, voltage */
val = (buf[0] << 4) + (buf[1] >> 4);
}
switch (reg) {
case LTC2945_POWER_H:
case LTC2945_MAX_POWER_H:
case LTC2945_MIN_POWER_H:
case LTC2945_MAX_POWER_THRES_H:
case LTC2945_MIN_POWER_THRES_H:
/*
* Convert to uW by assuming current is measured with
* an 1mOhm sense resistor, similar to current
* measurements.
* Control register bit 0 selects if voltage at SENSE+/VDD
* or voltage at ADIN is used to measure power.
*/
ret = regmap_read(regmap, LTC2945_CONTROL, &control);
if (ret < 0)
return ret;
if (control & CONTROL_MULT_SELECT) {
/* 25 mV * 25 uV = 0.625 uV resolution. */
val *= 625LL;
} else {
/* 0.5 mV * 25 uV = 0.0125 uV resolution. */
val = (val * 25LL) >> 1;
}
break;
case LTC2945_VIN_H:
case LTC2945_MAX_VIN_H:
case LTC2945_MIN_VIN_H:
case LTC2945_MAX_VIN_THRES_H:
case LTC2945_MIN_VIN_THRES_H:
/* 25 mV resolution. Convert to mV. */
val *= 25;
break;
case LTC2945_ADIN_H:
case LTC2945_MAX_ADIN_H:
case LTC2945_MIN_ADIN_THRES_H:
case LTC2945_MAX_ADIN_THRES_H:
case LTC2945_MIN_ADIN_H:
/* 0.5mV resolution. Convert to mV. */
val = val >> 1;
break;
case LTC2945_SENSE_H:
case LTC2945_MAX_SENSE_H:
case LTC2945_MIN_SENSE_H:
case LTC2945_MAX_SENSE_THRES_H:
case LTC2945_MIN_SENSE_THRES_H:
/*
* 25 uV resolution. Convert to current as measured with
* an 1 mOhm sense resistor, in mA. If a different sense
* resistor is installed, calculate the actual current by
* dividing the reported current by the sense resistor value
* in mOhm.
*/
val *= 25;
break;
default:
return -EINVAL;
}
return val;
}
static int ltc2945_val_to_reg(struct device *dev, u8 reg,
unsigned long val)
{
struct regmap *regmap = dev_get_drvdata(dev);
unsigned int control;
int ret;
switch (reg) {
case LTC2945_POWER_H:
case LTC2945_MAX_POWER_H:
case LTC2945_MIN_POWER_H:
case LTC2945_MAX_POWER_THRES_H:
case LTC2945_MIN_POWER_THRES_H:
/*
* Convert to register value by assuming current is measured
* with an 1mOhm sense resistor, similar to current
* measurements.
* Control register bit 0 selects if voltage at SENSE+/VDD
* or voltage at ADIN is used to measure power, which in turn
* determines register calculations.
*/
ret = regmap_read(regmap, LTC2945_CONTROL, &control);
if (ret < 0)
return ret;
if (control & CONTROL_MULT_SELECT) {
/* 25 mV * 25 uV = 0.625 uV resolution. */
val = DIV_ROUND_CLOSEST(val, 625);
} else {
/*
* 0.5 mV * 25 uV = 0.0125 uV resolution.
* Divide first to avoid overflow;
* accept loss of accuracy.
*/
val = DIV_ROUND_CLOSEST(val, 25) * 2;
}
break;
case LTC2945_VIN_H:
case LTC2945_MAX_VIN_H:
case LTC2945_MIN_VIN_H:
case LTC2945_MAX_VIN_THRES_H:
case LTC2945_MIN_VIN_THRES_H:
/* 25 mV resolution. */
val /= 25;
break;
case LTC2945_ADIN_H:
case LTC2945_MAX_ADIN_H:
case LTC2945_MIN_ADIN_THRES_H:
case LTC2945_MAX_ADIN_THRES_H:
case LTC2945_MIN_ADIN_H:
/* 0.5mV resolution. */
val *= 2;
break;
case LTC2945_SENSE_H:
case LTC2945_MAX_SENSE_H:
case LTC2945_MIN_SENSE_H:
case LTC2945_MAX_SENSE_THRES_H:
case LTC2945_MIN_SENSE_THRES_H:
/*
* 25 uV resolution. Convert to current as measured with
* an 1 mOhm sense resistor, in mA. If a different sense
* resistor is installed, calculate the actual current by
* dividing the reported current by the sense resistor value
* in mOhm.
*/
val = DIV_ROUND_CLOSEST(val, 25);
break;
default:
return -EINVAL;
}
return val;
}
static ssize_t ltc2945_value_show(struct device *dev,
struct device_attribute *da, char *buf)
{
struct sensor_device_attribute *attr = to_sensor_dev_attr(da);
long long value;
value = ltc2945_reg_to_val(dev, attr->index);
if (value < 0)
return value;
return snprintf(buf, PAGE_SIZE, "%lld\n", value);
}
static ssize_t ltc2945_value_store(struct device *dev,
struct device_attribute *da,
const char *buf, size_t count)
{
struct sensor_device_attribute *attr = to_sensor_dev_attr(da);
struct regmap *regmap = dev_get_drvdata(dev);
u8 reg = attr->index;
unsigned long val;
u8 regbuf[3];
int num_regs;
int regval;
int ret;
ret = kstrtoul(buf, 10, &val);
if (ret)
return ret;
/* convert to register value, then clamp and write result */
regval = ltc2945_val_to_reg(dev, reg, val);
if (is_power_reg(reg)) {
regval = clamp_val(regval, 0, 0xffffff);
regbuf[0] = regval >> 16;
regbuf[1] = (regval >> 8) & 0xff;
regbuf[2] = regval;
num_regs = 3;
} else {
regval = clamp_val(regval, 0, 0xfff) << 4;
regbuf[0] = regval >> 8;
regbuf[1] = regval & 0xff;
num_regs = 2;
}
ret = regmap_bulk_write(regmap, reg, regbuf, num_regs);
return ret < 0 ? ret : count;
}
static ssize_t ltc2945_history_store(struct device *dev,
struct device_attribute *da,
const char *buf, size_t count)
{
struct sensor_device_attribute *attr = to_sensor_dev_attr(da);
struct regmap *regmap = dev_get_drvdata(dev);
u8 reg = attr->index;
int num_regs = is_power_reg(reg) ? 3 : 2;
u8 buf_min[3] = { 0xff, 0xff, 0xff };
u8 buf_max[3] = { 0, 0, 0 };
unsigned long val;
int ret;
ret = kstrtoul(buf, 10, &val);
if (ret)
return ret;
if (val != 1)
return -EINVAL;
ret = regmap_update_bits(regmap, LTC2945_CONTROL, CONTROL_TEST_MODE,
CONTROL_TEST_MODE);
/* Reset minimum */
ret = regmap_bulk_write(regmap, reg, buf_min, num_regs);
if (ret)
return ret;
switch (reg) {
case LTC2945_MIN_POWER_H:
reg = LTC2945_MAX_POWER_H;
break;
case LTC2945_MIN_SENSE_H:
reg = LTC2945_MAX_SENSE_H;
break;
case LTC2945_MIN_VIN_H:
reg = LTC2945_MAX_VIN_H;
break;
case LTC2945_MIN_ADIN_H:
reg = LTC2945_MAX_ADIN_H;
break;
default:
WARN_ONCE(1, "Bad register: 0x%x\n", reg);
return -EINVAL;
}
/* Reset maximum */
ret = regmap_bulk_write(regmap, reg, buf_max, num_regs);
/* Try resetting test mode even if there was an error */
regmap_update_bits(regmap, LTC2945_CONTROL, CONTROL_TEST_MODE, 0);
return ret ? : count;
}
static ssize_t ltc2945_bool_show(struct device *dev,
struct device_attribute *da, char *buf)
{
struct sensor_device_attribute *attr = to_sensor_dev_attr(da);
struct regmap *regmap = dev_get_drvdata(dev);
unsigned int fault;
int ret;
ret = regmap_read(regmap, LTC2945_FAULT, &fault);
if (ret < 0)
return ret;
fault &= attr->index;
if (fault) /* Clear reported faults in chip register */
regmap_update_bits(regmap, LTC2945_FAULT, attr->index, 0);
return snprintf(buf, PAGE_SIZE, "%d\n", !!fault);
}
/* Input voltages */
static SENSOR_DEVICE_ATTR_RO(in1_input, ltc2945_value, LTC2945_VIN_H);
static SENSOR_DEVICE_ATTR_RW(in1_min, ltc2945_value, LTC2945_MIN_VIN_THRES_H);
static SENSOR_DEVICE_ATTR_RW(in1_max, ltc2945_value, LTC2945_MAX_VIN_THRES_H);
static SENSOR_DEVICE_ATTR_RO(in1_lowest, ltc2945_value, LTC2945_MIN_VIN_H);
static SENSOR_DEVICE_ATTR_RO(in1_highest, ltc2945_value, LTC2945_MAX_VIN_H);
static SENSOR_DEVICE_ATTR_WO(in1_reset_history, ltc2945_history,
LTC2945_MIN_VIN_H);
static SENSOR_DEVICE_ATTR_RO(in2_input, ltc2945_value, LTC2945_ADIN_H);
static SENSOR_DEVICE_ATTR_RW(in2_min, ltc2945_value, LTC2945_MIN_ADIN_THRES_H);
static SENSOR_DEVICE_ATTR_RW(in2_max, ltc2945_value, LTC2945_MAX_ADIN_THRES_H);
static SENSOR_DEVICE_ATTR_RO(in2_lowest, ltc2945_value, LTC2945_MIN_ADIN_H);
static SENSOR_DEVICE_ATTR_RO(in2_highest, ltc2945_value, LTC2945_MAX_ADIN_H);
static SENSOR_DEVICE_ATTR_WO(in2_reset_history, ltc2945_history,
LTC2945_MIN_ADIN_H);
/* Voltage alarms */
static SENSOR_DEVICE_ATTR_RO(in1_min_alarm, ltc2945_bool, FAULT_VIN_UV);
static SENSOR_DEVICE_ATTR_RO(in1_max_alarm, ltc2945_bool, FAULT_VIN_OV);
static SENSOR_DEVICE_ATTR_RO(in2_min_alarm, ltc2945_bool, FAULT_ADIN_UV);
static SENSOR_DEVICE_ATTR_RO(in2_max_alarm, ltc2945_bool, FAULT_ADIN_OV);
/* Currents (via sense resistor) */
static SENSOR_DEVICE_ATTR_RO(curr1_input, ltc2945_value, LTC2945_SENSE_H);
static SENSOR_DEVICE_ATTR_RW(curr1_min, ltc2945_value,
LTC2945_MIN_SENSE_THRES_H);
static SENSOR_DEVICE_ATTR_RW(curr1_max, ltc2945_value,
LTC2945_MAX_SENSE_THRES_H);
static SENSOR_DEVICE_ATTR_RO(curr1_lowest, ltc2945_value, LTC2945_MIN_SENSE_H);
static SENSOR_DEVICE_ATTR_RO(curr1_highest, ltc2945_value,
LTC2945_MAX_SENSE_H);
static SENSOR_DEVICE_ATTR_WO(curr1_reset_history, ltc2945_history,
LTC2945_MIN_SENSE_H);
/* Current alarms */
static SENSOR_DEVICE_ATTR_RO(curr1_min_alarm, ltc2945_bool, FAULT_SENSE_UV);
static SENSOR_DEVICE_ATTR_RO(curr1_max_alarm, ltc2945_bool, FAULT_SENSE_OV);
/* Power */
static SENSOR_DEVICE_ATTR_RO(power1_input, ltc2945_value, LTC2945_POWER_H);
static SENSOR_DEVICE_ATTR_RW(power1_min, ltc2945_value,
LTC2945_MIN_POWER_THRES_H);
static SENSOR_DEVICE_ATTR_RW(power1_max, ltc2945_value,
LTC2945_MAX_POWER_THRES_H);
static SENSOR_DEVICE_ATTR_RO(power1_input_lowest, ltc2945_value,
LTC2945_MIN_POWER_H);
static SENSOR_DEVICE_ATTR_RO(power1_input_highest, ltc2945_value,
LTC2945_MAX_POWER_H);
static SENSOR_DEVICE_ATTR_WO(power1_reset_history, ltc2945_history,
LTC2945_MIN_POWER_H);
/* Power alarms */
static SENSOR_DEVICE_ATTR_RO(power1_min_alarm, ltc2945_bool, FAULT_POWER_UV);
static SENSOR_DEVICE_ATTR_RO(power1_max_alarm, ltc2945_bool, FAULT_POWER_OV);
static struct attribute *ltc2945_attrs[] = {
&sensor_dev_attr_in1_input.dev_attr.attr,
&sensor_dev_attr_in1_min.dev_attr.attr,
&sensor_dev_attr_in1_max.dev_attr.attr,
&sensor_dev_attr_in1_lowest.dev_attr.attr,
&sensor_dev_attr_in1_highest.dev_attr.attr,
&sensor_dev_attr_in1_reset_history.dev_attr.attr,
&sensor_dev_attr_in1_min_alarm.dev_attr.attr,
&sensor_dev_attr_in1_max_alarm.dev_attr.attr,
&sensor_dev_attr_in2_input.dev_attr.attr,
&sensor_dev_attr_in2_min.dev_attr.attr,
&sensor_dev_attr_in2_max.dev_attr.attr,
&sensor_dev_attr_in2_lowest.dev_attr.attr,
&sensor_dev_attr_in2_highest.dev_attr.attr,
&sensor_dev_attr_in2_reset_history.dev_attr.attr,
&sensor_dev_attr_in2_min_alarm.dev_attr.attr,
&sensor_dev_attr_in2_max_alarm.dev_attr.attr,
&sensor_dev_attr_curr1_input.dev_attr.attr,
&sensor_dev_attr_curr1_min.dev_attr.attr,
&sensor_dev_attr_curr1_max.dev_attr.attr,
&sensor_dev_attr_curr1_lowest.dev_attr.attr,
&sensor_dev_attr_curr1_highest.dev_attr.attr,
&sensor_dev_attr_curr1_reset_history.dev_attr.attr,
&sensor_dev_attr_curr1_min_alarm.dev_attr.attr,
&sensor_dev_attr_curr1_max_alarm.dev_attr.attr,
&sensor_dev_attr_power1_input.dev_attr.attr,
&sensor_dev_attr_power1_min.dev_attr.attr,
&sensor_dev_attr_power1_max.dev_attr.attr,
&sensor_dev_attr_power1_input_lowest.dev_attr.attr,
&sensor_dev_attr_power1_input_highest.dev_attr.attr,
&sensor_dev_attr_power1_reset_history.dev_attr.attr,
&sensor_dev_attr_power1_min_alarm.dev_attr.attr,
&sensor_dev_attr_power1_max_alarm.dev_attr.attr,
NULL,
};
ATTRIBUTE_GROUPS(ltc2945);
static const struct regmap_config ltc2945_regmap_config = {
.reg_bits = 8,
.val_bits = 8,
.max_register = LTC2945_MIN_ADIN_THRES_L,
};
static int ltc2945_probe(struct i2c_client *client)
{
struct device *dev = &client->dev;
struct device *hwmon_dev;
struct regmap *regmap;
regmap = devm_regmap_init_i2c(client, &ltc2945_regmap_config);
if (IS_ERR(regmap)) {
dev_err(dev, "failed to allocate register map\n");
return PTR_ERR(regmap);
}
/* Clear faults */
regmap_write(regmap, LTC2945_FAULT, 0x00);
hwmon_dev = devm_hwmon_device_register_with_groups(dev, client->name,
regmap,
ltc2945_groups);
return PTR_ERR_OR_ZERO(hwmon_dev);
}
static const struct i2c_device_id ltc2945_id[] = {
{"ltc2945", 0},
{ }
};
MODULE_DEVICE_TABLE(i2c, ltc2945_id);
static struct i2c_driver ltc2945_driver = {
.driver = {
.name = "ltc2945",
},
.probe_new = ltc2945_probe,
.id_table = ltc2945_id,
};
module_i2c_driver(ltc2945_driver);
MODULE_AUTHOR("Guenter Roeck <linux@roeck-us.net>");
MODULE_DESCRIPTION("LTC2945 driver");
MODULE_LICENSE("GPL");
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