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linux/drivers/hwmon/ina3221.c
Guenter Roeck 6f307b7c2b hwmon: (ina3221) Use HWMON_CHANNEL_INFO macro 
The HWMON_CHANNEL_INFO macro simplifies the code, reduces the likelihood
of errors, and makes the code easier to read.

The conversion was done automatically with coccinelle. The semantic patch
used to make this change is as follows.

@r@
initializer list elements;
identifier i;
@@

-u32 i[] = {
-  elements,
-  0
-};

@s@
identifier r.i,j,ty;
@@

-struct hwmon_channel_info j = {
-       .type = ty,
-       .config = i,
-};

@script:ocaml t@
ty << s.ty;
elements << r.elements;
shorter;
elems;
@@

shorter :=
   make_ident (List.hd(List.rev (Str.split (Str.regexp "_") ty)));
elems :=
   make_ident
    (String.concat ","
     (List.map (fun x -> Printf.sprintf "\n\t\t\t   %s" x)
       (Str.split (Str.regexp " , ") elements)))

@@
identifier s.j,t.shorter;
identifier t.elems;
@@

- &j
+ HWMON_CHANNEL_INFO(shorter,elems)

This patch does not introduce functional changes. Many thanks to
Julia Lawall for providing the semantic patch.

The patch was post-edited to retain comments.

Signed-off-by: Guenter Roeck <linux@roeck-us.net>
2019-04-15 17:19:53 -07:00

812 lines
20 KiB
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/*
* INA3221 Triple Current/Voltage Monitor
*
* Copyright (C) 2016 Texas Instruments Incorporated - http://www.ti.com/
* Andrew F. Davis <afd@ti.com>
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License version 2 as
* published by the Free Software Foundation.
*
* 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.
*/
#include <linux/hwmon.h>
#include <linux/hwmon-sysfs.h>
#include <linux/i2c.h>
#include <linux/module.h>
#include <linux/mutex.h>
#include <linux/of.h>
#include <linux/pm_runtime.h>
#include <linux/regmap.h>
#define INA3221_DRIVER_NAME "ina3221"
#define INA3221_CONFIG 0x00
#define INA3221_SHUNT1 0x01
#define INA3221_BUS1 0x02
#define INA3221_SHUNT2 0x03
#define INA3221_BUS2 0x04
#define INA3221_SHUNT3 0x05
#define INA3221_BUS3 0x06
#define INA3221_CRIT1 0x07
#define INA3221_WARN1 0x08
#define INA3221_CRIT2 0x09
#define INA3221_WARN2 0x0a
#define INA3221_CRIT3 0x0b
#define INA3221_WARN3 0x0c
#define INA3221_MASK_ENABLE 0x0f
#define INA3221_CONFIG_MODE_MASK GENMASK(2, 0)
#define INA3221_CONFIG_MODE_POWERDOWN 0
#define INA3221_CONFIG_MODE_SHUNT BIT(0)
#define INA3221_CONFIG_MODE_BUS BIT(1)
#define INA3221_CONFIG_MODE_CONTINUOUS BIT(2)
#define INA3221_CONFIG_VSH_CT_SHIFT 3
#define INA3221_CONFIG_VSH_CT_MASK GENMASK(5, 3)
#define INA3221_CONFIG_VSH_CT(x) (((x) & GENMASK(5, 3)) >> 3)
#define INA3221_CONFIG_VBUS_CT_SHIFT 6
#define INA3221_CONFIG_VBUS_CT_MASK GENMASK(8, 6)
#define INA3221_CONFIG_VBUS_CT(x) (((x) & GENMASK(8, 6)) >> 6)
#define INA3221_CONFIG_CHs_EN_MASK GENMASK(14, 12)
#define INA3221_CONFIG_CHx_EN(x) BIT(14 - (x))
#define INA3221_CONFIG_DEFAULT 0x7127
#define INA3221_RSHUNT_DEFAULT 10000
enum ina3221_fields {
/* Configuration */
F_RST,
/* Status Flags */
F_CVRF,
/* Alert Flags */
F_WF3, F_WF2, F_WF1,
F_CF3, F_CF2, F_CF1,
/* sentinel */
F_MAX_FIELDS
};
static const struct reg_field ina3221_reg_fields[] = {
[F_RST] = REG_FIELD(INA3221_CONFIG, 15, 15),
[F_CVRF] = REG_FIELD(INA3221_MASK_ENABLE, 0, 0),
[F_WF3] = REG_FIELD(INA3221_MASK_ENABLE, 3, 3),
[F_WF2] = REG_FIELD(INA3221_MASK_ENABLE, 4, 4),
[F_WF1] = REG_FIELD(INA3221_MASK_ENABLE, 5, 5),
[F_CF3] = REG_FIELD(INA3221_MASK_ENABLE, 7, 7),
[F_CF2] = REG_FIELD(INA3221_MASK_ENABLE, 8, 8),
[F_CF1] = REG_FIELD(INA3221_MASK_ENABLE, 9, 9),
};
enum ina3221_channels {
INA3221_CHANNEL1,
INA3221_CHANNEL2,
INA3221_CHANNEL3,
INA3221_NUM_CHANNELS
};
/**
* struct ina3221_input - channel input source specific information
* @label: label of channel input source
* @shunt_resistor: shunt resistor value of channel input source
* @disconnected: connection status of channel input source
*/
struct ina3221_input {
const char *label;
int shunt_resistor;
bool disconnected;
};
/**
* struct ina3221_data - device specific information
* @pm_dev: Device pointer for pm runtime
* @regmap: Register map of the device
* @fields: Register fields of the device
* @inputs: Array of channel input source specific structures
* @lock: mutex lock to serialize sysfs attribute accesses
* @reg_config: Register value of INA3221_CONFIG
* @single_shot: running in single-shot operating mode
*/
struct ina3221_data {
struct device *pm_dev;
struct regmap *regmap;
struct regmap_field *fields[F_MAX_FIELDS];
struct ina3221_input inputs[INA3221_NUM_CHANNELS];
struct mutex lock;
u32 reg_config;
bool single_shot;
};
static inline bool ina3221_is_enabled(struct ina3221_data *ina, int channel)
{
return pm_runtime_active(ina->pm_dev) &&
(ina->reg_config & INA3221_CONFIG_CHx_EN(channel));
}
/* Lookup table for Bus and Shunt conversion times in usec */
static const u16 ina3221_conv_time[] = {
140, 204, 332, 588, 1100, 2116, 4156, 8244,
};
static inline int ina3221_wait_for_data(struct ina3221_data *ina)
{
u32 channels = hweight16(ina->reg_config & INA3221_CONFIG_CHs_EN_MASK);
u32 vbus_ct_idx = INA3221_CONFIG_VBUS_CT(ina->reg_config);
u32 vsh_ct_idx = INA3221_CONFIG_VSH_CT(ina->reg_config);
u32 vbus_ct = ina3221_conv_time[vbus_ct_idx];
u32 vsh_ct = ina3221_conv_time[vsh_ct_idx];
u32 wait, cvrf;
/* Calculate total conversion time */
wait = channels * (vbus_ct + vsh_ct);
/* Polling the CVRF bit to make sure read data is ready */
return regmap_field_read_poll_timeout(ina->fields[F_CVRF],
cvrf, cvrf, wait, 100000);
}
static int ina3221_read_value(struct ina3221_data *ina, unsigned int reg,
int *val)
{
unsigned int regval;
int ret;
ret = regmap_read(ina->regmap, reg, &regval);
if (ret)
return ret;
*val = sign_extend32(regval >> 3, 12);
return 0;
}
static const u8 ina3221_in_reg[] = {
INA3221_BUS1,
INA3221_BUS2,
INA3221_BUS3,
INA3221_SHUNT1,
INA3221_SHUNT2,
INA3221_SHUNT3,
};
static int ina3221_read_in(struct device *dev, u32 attr, int channel, long *val)
{
const bool is_shunt = channel > INA3221_CHANNEL3;
struct ina3221_data *ina = dev_get_drvdata(dev);
u8 reg = ina3221_in_reg[channel];
int regval, ret;
/* Translate shunt channel index to sensor channel index */
channel %= INA3221_NUM_CHANNELS;
switch (attr) {
case hwmon_in_input:
if (!ina3221_is_enabled(ina, channel))
return -ENODATA;
/* Write CONFIG register to trigger a single-shot measurement */
if (ina->single_shot)
regmap_write(ina->regmap, INA3221_CONFIG,
ina->reg_config);
ret = ina3221_wait_for_data(ina);
if (ret)
return ret;
ret = ina3221_read_value(ina, reg, &regval);
if (ret)
return ret;
/*
* Scale of shunt voltage (uV): LSB is 40uV
* Scale of bus voltage (mV): LSB is 8mV
*/
*val = regval * (is_shunt ? 40 : 8);
return 0;
case hwmon_in_enable:
*val = ina3221_is_enabled(ina, channel);
return 0;
default:
return -EOPNOTSUPP;
}
}
static const u8 ina3221_curr_reg[][INA3221_NUM_CHANNELS] = {
[hwmon_curr_input] = { INA3221_SHUNT1, INA3221_SHUNT2, INA3221_SHUNT3 },
[hwmon_curr_max] = { INA3221_WARN1, INA3221_WARN2, INA3221_WARN3 },
[hwmon_curr_crit] = { INA3221_CRIT1, INA3221_CRIT2, INA3221_CRIT3 },
[hwmon_curr_max_alarm] = { F_WF1, F_WF2, F_WF3 },
[hwmon_curr_crit_alarm] = { F_CF1, F_CF2, F_CF3 },
};
static int ina3221_read_curr(struct device *dev, u32 attr,
int channel, long *val)
{
struct ina3221_data *ina = dev_get_drvdata(dev);
struct ina3221_input *input = &ina->inputs[channel];
int resistance_uo = input->shunt_resistor;
u8 reg = ina3221_curr_reg[attr][channel];
int regval, voltage_nv, ret;
switch (attr) {
case hwmon_curr_input:
if (!ina3221_is_enabled(ina, channel))
return -ENODATA;
/* Write CONFIG register to trigger a single-shot measurement */
if (ina->single_shot)
regmap_write(ina->regmap, INA3221_CONFIG,
ina->reg_config);
ret = ina3221_wait_for_data(ina);
if (ret)
return ret;
/* fall through */
case hwmon_curr_crit:
case hwmon_curr_max:
ret = ina3221_read_value(ina, reg, &regval);
if (ret)
return ret;
/* Scale of shunt voltage: LSB is 40uV (40000nV) */
voltage_nv = regval * 40000;
/* Return current in mA */
*val = DIV_ROUND_CLOSEST(voltage_nv, resistance_uo);
return 0;
case hwmon_curr_crit_alarm:
case hwmon_curr_max_alarm:
/* No actual register read if channel is disabled */
if (!ina3221_is_enabled(ina, channel)) {
/* Return 0 for alert flags */
*val = 0;
return 0;
}
ret = regmap_field_read(ina->fields[reg], &regval);
if (ret)
return ret;
*val = regval;
return 0;
default:
return -EOPNOTSUPP;
}
}
static int ina3221_write_curr(struct device *dev, u32 attr,
int channel, long val)
{
struct ina3221_data *ina = dev_get_drvdata(dev);
struct ina3221_input *input = &ina->inputs[channel];
int resistance_uo = input->shunt_resistor;
u8 reg = ina3221_curr_reg[attr][channel];
int regval, current_ma, voltage_uv;
/* clamp current */
current_ma = clamp_val(val,
INT_MIN / resistance_uo,
INT_MAX / resistance_uo);
voltage_uv = DIV_ROUND_CLOSEST(current_ma * resistance_uo, 1000);
/* clamp voltage */
voltage_uv = clamp_val(voltage_uv, -163800, 163800);
/* 1 / 40uV(scale) << 3(register shift) = 5 */
regval = DIV_ROUND_CLOSEST(voltage_uv, 5) & 0xfff8;
return regmap_write(ina->regmap, reg, regval);
}
static int ina3221_write_enable(struct device *dev, int channel, bool enable)
{
struct ina3221_data *ina = dev_get_drvdata(dev);
u16 config, mask = INA3221_CONFIG_CHx_EN(channel);
u16 config_old = ina->reg_config & mask;
int ret;
config = enable ? mask : 0;
/* Bypass if enable status is not being changed */
if (config_old == config)
return 0;
/* For enabling routine, increase refcount and resume() at first */
if (enable) {
ret = pm_runtime_get_sync(ina->pm_dev);
if (ret < 0) {
dev_err(dev, "Failed to get PM runtime\n");
return ret;
}
}
/* Enable or disable the channel */
ret = regmap_update_bits(ina->regmap, INA3221_CONFIG, mask, config);
if (ret)
goto fail;
/* Cache the latest config register value */
ret = regmap_read(ina->regmap, INA3221_CONFIG, &ina->reg_config);
if (ret)
goto fail;
/* For disabling routine, decrease refcount or suspend() at last */
if (!enable)
pm_runtime_put_sync(ina->pm_dev);
return 0;
fail:
if (enable) {
dev_err(dev, "Failed to enable channel %d: error %d\n",
channel, ret);
pm_runtime_put_sync(ina->pm_dev);
}
return ret;
}
static int ina3221_read(struct device *dev, enum hwmon_sensor_types type,
u32 attr, int channel, long *val)
{
struct ina3221_data *ina = dev_get_drvdata(dev);
int ret;
mutex_lock(&ina->lock);
switch (type) {
case hwmon_in:
/* 0-align channel ID */
ret = ina3221_read_in(dev, attr, channel - 1, val);
break;
case hwmon_curr:
ret = ina3221_read_curr(dev, attr, channel, val);
break;
default:
ret = -EOPNOTSUPP;
break;
}
mutex_unlock(&ina->lock);
return ret;
}
static int ina3221_write(struct device *dev, enum hwmon_sensor_types type,
u32 attr, int channel, long val)
{
struct ina3221_data *ina = dev_get_drvdata(dev);
int ret;
mutex_lock(&ina->lock);
switch (type) {
case hwmon_in:
/* 0-align channel ID */
ret = ina3221_write_enable(dev, channel - 1, val);
break;
case hwmon_curr:
ret = ina3221_write_curr(dev, attr, channel, val);
break;
default:
ret = -EOPNOTSUPP;
break;
}
mutex_unlock(&ina->lock);
return ret;
}
static int ina3221_read_string(struct device *dev, enum hwmon_sensor_types type,
u32 attr, int channel, const char **str)
{
struct ina3221_data *ina = dev_get_drvdata(dev);
int index = channel - 1;
*str = ina->inputs[index].label;
return 0;
}
static umode_t ina3221_is_visible(const void *drvdata,
enum hwmon_sensor_types type,
u32 attr, int channel)
{
const struct ina3221_data *ina = drvdata;
const struct ina3221_input *input = NULL;
switch (type) {
case hwmon_in:
/* Ignore in0_ */
if (channel == 0)
return 0;
switch (attr) {
case hwmon_in_label:
if (channel - 1 <= INA3221_CHANNEL3)
input = &ina->inputs[channel - 1];
/* Hide label node if label is not provided */
return (input && input->label) ? 0444 : 0;
case hwmon_in_input:
return 0444;
case hwmon_in_enable:
return 0644;
default:
return 0;
}
case hwmon_curr:
switch (attr) {
case hwmon_curr_input:
case hwmon_curr_crit_alarm:
case hwmon_curr_max_alarm:
return 0444;
case hwmon_curr_crit:
case hwmon_curr_max:
return 0644;
default:
return 0;
}
default:
return 0;
}
}
#define INA3221_HWMON_CURR_CONFIG (HWMON_C_INPUT | \
HWMON_C_CRIT | HWMON_C_CRIT_ALARM | \
HWMON_C_MAX | HWMON_C_MAX_ALARM)
static const struct hwmon_channel_info *ina3221_info[] = {
HWMON_CHANNEL_INFO(in,
/* 0: dummy, skipped in is_visible */
HWMON_I_INPUT,
/* 1-3: input voltage Channels */
HWMON_I_INPUT | HWMON_I_ENABLE | HWMON_I_LABEL,
HWMON_I_INPUT | HWMON_I_ENABLE | HWMON_I_LABEL,
HWMON_I_INPUT | HWMON_I_ENABLE | HWMON_I_LABEL,
/* 4-6: shunt voltage Channels */
HWMON_I_INPUT,
HWMON_I_INPUT,
HWMON_I_INPUT),
HWMON_CHANNEL_INFO(curr,
INA3221_HWMON_CURR_CONFIG,
INA3221_HWMON_CURR_CONFIG,
INA3221_HWMON_CURR_CONFIG),
NULL
};
static const struct hwmon_ops ina3221_hwmon_ops = {
.is_visible = ina3221_is_visible,
.read_string = ina3221_read_string,
.read = ina3221_read,
.write = ina3221_write,
};
static const struct hwmon_chip_info ina3221_chip_info = {
.ops = &ina3221_hwmon_ops,
.info = ina3221_info,
};
/* Extra attribute groups */
static ssize_t ina3221_shunt_show(struct device *dev,
struct device_attribute *attr, char *buf)
{
struct sensor_device_attribute *sd_attr = to_sensor_dev_attr(attr);
struct ina3221_data *ina = dev_get_drvdata(dev);
unsigned int channel = sd_attr->index;
struct ina3221_input *input = &ina->inputs[channel];
return snprintf(buf, PAGE_SIZE, "%d\n", input->shunt_resistor);
}
static ssize_t ina3221_shunt_store(struct device *dev,
struct device_attribute *attr,
const char *buf, size_t count)
{
struct sensor_device_attribute *sd_attr = to_sensor_dev_attr(attr);
struct ina3221_data *ina = dev_get_drvdata(dev);
unsigned int channel = sd_attr->index;
struct ina3221_input *input = &ina->inputs[channel];
int val;
int ret;
ret = kstrtoint(buf, 0, &val);
if (ret)
return ret;
val = clamp_val(val, 1, INT_MAX);
input->shunt_resistor = val;
return count;
}
/* shunt resistance */
static SENSOR_DEVICE_ATTR_RW(shunt1_resistor, ina3221_shunt, INA3221_CHANNEL1);
static SENSOR_DEVICE_ATTR_RW(shunt2_resistor, ina3221_shunt, INA3221_CHANNEL2);
static SENSOR_DEVICE_ATTR_RW(shunt3_resistor, ina3221_shunt, INA3221_CHANNEL3);
static struct attribute *ina3221_attrs[] = {
&sensor_dev_attr_shunt1_resistor.dev_attr.attr,
&sensor_dev_attr_shunt2_resistor.dev_attr.attr,
&sensor_dev_attr_shunt3_resistor.dev_attr.attr,
NULL,
};
ATTRIBUTE_GROUPS(ina3221);
static const struct regmap_range ina3221_yes_ranges[] = {
regmap_reg_range(INA3221_CONFIG, INA3221_BUS3),
regmap_reg_range(INA3221_MASK_ENABLE, INA3221_MASK_ENABLE),
};
static const struct regmap_access_table ina3221_volatile_table = {
.yes_ranges = ina3221_yes_ranges,
.n_yes_ranges = ARRAY_SIZE(ina3221_yes_ranges),
};
static const struct regmap_config ina3221_regmap_config = {
.reg_bits = 8,
.val_bits = 16,
.cache_type = REGCACHE_RBTREE,
.volatile_table = &ina3221_volatile_table,
};
static int ina3221_probe_child_from_dt(struct device *dev,
struct device_node *child,
struct ina3221_data *ina)
{
struct ina3221_input *input;
u32 val;
int ret;
ret = of_property_read_u32(child, "reg", &val);
if (ret) {
dev_err(dev, "missing reg property of %pOFn\n", child);
return ret;
} else if (val > INA3221_CHANNEL3) {
dev_err(dev, "invalid reg %d of %pOFn\n", val, child);
return ret;
}
input = &ina->inputs[val];
/* Log the disconnected channel input */
if (!of_device_is_available(child)) {
input->disconnected = true;
return 0;
}
/* Save the connected input label if available */
of_property_read_string(child, "label", &input->label);
/* Overwrite default shunt resistor value optionally */
if (!of_property_read_u32(child, "shunt-resistor-micro-ohms", &val)) {
if (val < 1 || val > INT_MAX) {
dev_err(dev, "invalid shunt resistor value %u of %pOFn\n",
val, child);
return -EINVAL;
}
input->shunt_resistor = val;
}
return 0;
}
static int ina3221_probe_from_dt(struct device *dev, struct ina3221_data *ina)
{
const struct device_node *np = dev->of_node;
struct device_node *child;
int ret;
/* Compatible with non-DT platforms */
if (!np)
return 0;
ina->single_shot = of_property_read_bool(np, "ti,single-shot");
for_each_child_of_node(np, child) {
ret = ina3221_probe_child_from_dt(dev, child, ina);
if (ret)
return ret;
}
return 0;
}
static int ina3221_probe(struct i2c_client *client,
const struct i2c_device_id *id)
{
struct device *dev = &client->dev;
struct ina3221_data *ina;
struct device *hwmon_dev;
int i, ret;
ina = devm_kzalloc(dev, sizeof(*ina), GFP_KERNEL);
if (!ina)
return -ENOMEM;
ina->regmap = devm_regmap_init_i2c(client, &ina3221_regmap_config);
if (IS_ERR(ina->regmap)) {
dev_err(dev, "Unable to allocate register map\n");
return PTR_ERR(ina->regmap);
}
for (i = 0; i < F_MAX_FIELDS; i++) {
ina->fields[i] = devm_regmap_field_alloc(dev,
ina->regmap,
ina3221_reg_fields[i]);
if (IS_ERR(ina->fields[i])) {
dev_err(dev, "Unable to allocate regmap fields\n");
return PTR_ERR(ina->fields[i]);
}
}
for (i = 0; i < INA3221_NUM_CHANNELS; i++)
ina->inputs[i].shunt_resistor = INA3221_RSHUNT_DEFAULT;
ret = ina3221_probe_from_dt(dev, ina);
if (ret) {
dev_err(dev, "Unable to probe from device tree\n");
return ret;
}
/* The driver will be reset, so use reset value */
ina->reg_config = INA3221_CONFIG_DEFAULT;
/* Clear continuous bit to use single-shot mode */
if (ina->single_shot)
ina->reg_config &= ~INA3221_CONFIG_MODE_CONTINUOUS;
/* Disable channels if their inputs are disconnected */
for (i = 0; i < INA3221_NUM_CHANNELS; i++) {
if (ina->inputs[i].disconnected)
ina->reg_config &= ~INA3221_CONFIG_CHx_EN(i);
}
ina->pm_dev = dev;
mutex_init(&ina->lock);
dev_set_drvdata(dev, ina);
/* Enable PM runtime -- status is suspended by default */
pm_runtime_enable(ina->pm_dev);
/* Initialize (resume) the device */
for (i = 0; i < INA3221_NUM_CHANNELS; i++) {
if (ina->inputs[i].disconnected)
continue;
/* Match the refcount with number of enabled channels */
ret = pm_runtime_get_sync(ina->pm_dev);
if (ret < 0)
goto fail;
}
hwmon_dev = devm_hwmon_device_register_with_info(dev, client->name, ina,
&ina3221_chip_info,
ina3221_groups);
if (IS_ERR(hwmon_dev)) {
dev_err(dev, "Unable to register hwmon device\n");
ret = PTR_ERR(hwmon_dev);
goto fail;
}
return 0;
fail:
pm_runtime_disable(ina->pm_dev);
pm_runtime_set_suspended(ina->pm_dev);
/* pm_runtime_put_noidle() will decrease the PM refcount until 0 */
for (i = 0; i < INA3221_NUM_CHANNELS; i++)
pm_runtime_put_noidle(ina->pm_dev);
mutex_destroy(&ina->lock);
return ret;
}
static int ina3221_remove(struct i2c_client *client)
{
struct ina3221_data *ina = dev_get_drvdata(&client->dev);
int i;
pm_runtime_disable(ina->pm_dev);
pm_runtime_set_suspended(ina->pm_dev);
/* pm_runtime_put_noidle() will decrease the PM refcount until 0 */
for (i = 0; i < INA3221_NUM_CHANNELS; i++)
pm_runtime_put_noidle(ina->pm_dev);
mutex_destroy(&ina->lock);
return 0;
}
static int __maybe_unused ina3221_suspend(struct device *dev)
{
struct ina3221_data *ina = dev_get_drvdata(dev);
int ret;
/* Save config register value and enable cache-only */
ret = regmap_read(ina->regmap, INA3221_CONFIG, &ina->reg_config);
if (ret)
return ret;
/* Set to power-down mode for power saving */
ret = regmap_update_bits(ina->regmap, INA3221_CONFIG,
INA3221_CONFIG_MODE_MASK,
INA3221_CONFIG_MODE_POWERDOWN);
if (ret)
return ret;
regcache_cache_only(ina->regmap, true);
regcache_mark_dirty(ina->regmap);
return 0;
}
static int __maybe_unused ina3221_resume(struct device *dev)
{
struct ina3221_data *ina = dev_get_drvdata(dev);
int ret;
regcache_cache_only(ina->regmap, false);
/* Software reset the chip */
ret = regmap_field_write(ina->fields[F_RST], true);
if (ret) {
dev_err(dev, "Unable to reset device\n");
return ret;
}
/* Restore cached register values to hardware */
ret = regcache_sync(ina->regmap);
if (ret)
return ret;
/* Restore config register value to hardware */
ret = regmap_write(ina->regmap, INA3221_CONFIG, ina->reg_config);
if (ret)
return ret;
return 0;
}
static const struct dev_pm_ops ina3221_pm = {
SET_SYSTEM_SLEEP_PM_OPS(pm_runtime_force_suspend,
pm_runtime_force_resume)
SET_RUNTIME_PM_OPS(ina3221_suspend, ina3221_resume, NULL)
};
static const struct of_device_id ina3221_of_match_table[] = {
{ .compatible = "ti,ina3221", },
{ /* sentinel */ }
};
MODULE_DEVICE_TABLE(of, ina3221_of_match_table);
static const struct i2c_device_id ina3221_ids[] = {
{ "ina3221", 0 },
{ /* sentinel */ }
};
MODULE_DEVICE_TABLE(i2c, ina3221_ids);
static struct i2c_driver ina3221_i2c_driver = {
.probe = ina3221_probe,
.remove = ina3221_remove,
.driver = {
.name = INA3221_DRIVER_NAME,
.of_match_table = ina3221_of_match_table,
.pm = &ina3221_pm,
},
.id_table = ina3221_ids,
};
module_i2c_driver(ina3221_i2c_driver);
MODULE_AUTHOR("Andrew F. Davis <afd@ti.com>");
MODULE_DESCRIPTION("Texas Instruments INA3221 HWMon Driver");
MODULE_LICENSE("GPL v2");
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