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CoolPi-Armbian-Rockchip-RK3.../drivers/iio/adc/rtq6056.c

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// SPDX-License-Identifier: GPL-2.0
/*
* Copyright (c) 2022 Richtek Technology Corp.
*
* ChiYuan Huang <cy_huang@richtek.com>
*/
#include <linux/bitops.h>
#include <linux/delay.h>
#include <linux/i2c.h>
#include <linux/kernel.h>
#include <linux/mod_devicetable.h>
#include <linux/module.h>
#include <linux/pm_runtime.h>
#include <linux/property.h>
#include <linux/regmap.h>
#include <linux/sysfs.h>
#include <linux/types.h>
#include <linux/util_macros.h>
#include <linux/iio/buffer.h>
#include <linux/iio/iio.h>
#include <linux/iio/sysfs.h>
#include <linux/iio/trigger_consumer.h>
#include <linux/iio/triggered_buffer.h>
#define RTQ6056_REG_CONFIG 0x00
#define RTQ6056_REG_SHUNTVOLT 0x01
#define RTQ6056_REG_BUSVOLT 0x02
#define RTQ6056_REG_POWER 0x03
#define RTQ6056_REG_CURRENT 0x04
#define RTQ6056_REG_CALIBRATION 0x05
#define RTQ6056_REG_MASKENABLE 0x06
#define RTQ6056_REG_ALERTLIMIT 0x07
#define RTQ6056_REG_MANUFACTID 0xFE
#define RTQ6056_REG_DIEID 0xFF
#define RTQ6056_VENDOR_ID 0x1214
#define RTQ6056_DEFAULT_CONFIG 0x4127
#define RTQ6056_CONT_ALLON 7
enum {
RTQ6056_CH_VSHUNT = 0,
RTQ6056_CH_VBUS,
RTQ6056_CH_POWER,
RTQ6056_CH_CURRENT,
RTQ6056_MAX_CHANNEL
};
enum {
F_OPMODE = 0,
F_VSHUNTCT,
F_VBUSCT,
F_AVG,
F_RESET,
F_MAX_FIELDS
};
struct rtq6056_priv {
struct device *dev;
struct regmap *regmap;
struct regmap_field *rm_fields[F_MAX_FIELDS];
u32 shunt_resistor_uohm;
int vshuntct_us;
int vbusct_us;
int avg_sample;
};
static const struct reg_field rtq6056_reg_fields[F_MAX_FIELDS] = {
[F_OPMODE] = REG_FIELD(RTQ6056_REG_CONFIG, 0, 2),
[F_VSHUNTCT] = REG_FIELD(RTQ6056_REG_CONFIG, 3, 5),
[F_VBUSCT] = REG_FIELD(RTQ6056_REG_CONFIG, 6, 8),
[F_AVG] = REG_FIELD(RTQ6056_REG_CONFIG, 9, 11),
[F_RESET] = REG_FIELD(RTQ6056_REG_CONFIG, 15, 15),
};
static const struct iio_chan_spec rtq6056_channels[RTQ6056_MAX_CHANNEL + 1] = {
{
.type = IIO_VOLTAGE,
.indexed = 1,
.channel = 0,
.address = RTQ6056_REG_SHUNTVOLT,
.info_mask_separate = BIT(IIO_CHAN_INFO_RAW) |
BIT(IIO_CHAN_INFO_SCALE) |
BIT(IIO_CHAN_INFO_SAMP_FREQ),
.info_mask_separate_available = BIT(IIO_CHAN_INFO_SAMP_FREQ),
.info_mask_shared_by_all = BIT(IIO_CHAN_INFO_OVERSAMPLING_RATIO),
.info_mask_shared_by_all_available = BIT(IIO_CHAN_INFO_OVERSAMPLING_RATIO),
.scan_index = 0,
.scan_type = {
.sign = 's',
.realbits = 16,
.storagebits = 16,
.endianness = IIO_CPU,
},
},
{
.type = IIO_VOLTAGE,
.indexed = 1,
.channel = 1,
.address = RTQ6056_REG_BUSVOLT,
.info_mask_separate = BIT(IIO_CHAN_INFO_RAW) |
BIT(IIO_CHAN_INFO_SCALE) |
BIT(IIO_CHAN_INFO_SAMP_FREQ),
.info_mask_separate_available = BIT(IIO_CHAN_INFO_SAMP_FREQ),
.info_mask_shared_by_all = BIT(IIO_CHAN_INFO_OVERSAMPLING_RATIO),
.info_mask_shared_by_all_available = BIT(IIO_CHAN_INFO_OVERSAMPLING_RATIO),
.scan_index = 1,
.scan_type = {
.sign = 'u',
.realbits = 16,
.storagebits = 16,
.endianness = IIO_CPU,
},
},
{
.type = IIO_POWER,
.indexed = 1,
.channel = 2,
.address = RTQ6056_REG_POWER,
.info_mask_separate = BIT(IIO_CHAN_INFO_RAW) |
BIT(IIO_CHAN_INFO_SCALE) |
BIT(IIO_CHAN_INFO_SAMP_FREQ),
.info_mask_shared_by_all = BIT(IIO_CHAN_INFO_OVERSAMPLING_RATIO),
.info_mask_shared_by_all_available = BIT(IIO_CHAN_INFO_OVERSAMPLING_RATIO),
.scan_index = 2,
.scan_type = {
.sign = 'u',
.realbits = 16,
.storagebits = 16,
.endianness = IIO_CPU,
},
},
{
.type = IIO_CURRENT,
.indexed = 1,
.channel = 3,
.address = RTQ6056_REG_CURRENT,
.info_mask_separate = BIT(IIO_CHAN_INFO_RAW) |
BIT(IIO_CHAN_INFO_SAMP_FREQ),
.info_mask_shared_by_all = BIT(IIO_CHAN_INFO_OVERSAMPLING_RATIO),
.info_mask_shared_by_all_available = BIT(IIO_CHAN_INFO_OVERSAMPLING_RATIO),
.scan_index = 3,
.scan_type = {
.sign = 's',
.realbits = 16,
.storagebits = 16,
.endianness = IIO_CPU,
},
},
IIO_CHAN_SOFT_TIMESTAMP(RTQ6056_MAX_CHANNEL),
};
static int rtq6056_adc_read_channel(struct rtq6056_priv *priv,
struct iio_chan_spec const *ch,
int *val)
{
struct device *dev = priv->dev;
unsigned int addr = ch->address;
unsigned int regval;
int ret;
pm_runtime_get_sync(dev);
ret = regmap_read(priv->regmap, addr, &regval);
pm_runtime_mark_last_busy(dev);
pm_runtime_put(dev);
if (ret)
return ret;
/* Power and VBUS is unsigned 16-bit, others are signed 16-bit */
if (addr == RTQ6056_REG_BUSVOLT || addr == RTQ6056_REG_POWER)
*val = regval;
else
*val = sign_extend32(regval, 16);
return IIO_VAL_INT;
}
static int rtq6056_adc_read_scale(struct iio_chan_spec const *ch, int *val,
int *val2)
{
switch (ch->address) {
case RTQ6056_REG_SHUNTVOLT:
/* VSHUNT lsb 2.5uV */
*val = 2500;
*val2 = 1000000;
return IIO_VAL_FRACTIONAL;
case RTQ6056_REG_BUSVOLT:
/* VBUS lsb 1.25mV */
*val = 1250;
*val2 = 1000;
return IIO_VAL_FRACTIONAL;
case RTQ6056_REG_POWER:
/* Power lsb 25mW */
*val = 25;
return IIO_VAL_INT;
default:
return -EINVAL;
}
}
/*
* Sample frequency for channel VSHUNT and VBUS. The indices correspond
* with the bit value expected by the chip. And it can be found at
* https://www.richtek.com/assets/product_file/RTQ6056/DSQ6056-00.pdf
*/
static const int rtq6056_samp_freq_list[] = {
7194, 4926, 3717, 1904, 964, 485, 243, 122,
};
static int rtq6056_adc_set_samp_freq(struct rtq6056_priv *priv,
struct iio_chan_spec const *ch, int val)
{
struct regmap_field *rm_field;
unsigned int selector;
int *ct, ret;
if (val > 7194 || val < 122)
return -EINVAL;
if (ch->address == RTQ6056_REG_SHUNTVOLT) {
rm_field = priv->rm_fields[F_VSHUNTCT];
ct = &priv->vshuntct_us;
} else if (ch->address == RTQ6056_REG_BUSVOLT) {
rm_field = priv->rm_fields[F_VBUSCT];
ct = &priv->vbusct_us;
} else
return -EINVAL;
selector = find_closest_descending(val, rtq6056_samp_freq_list,
ARRAY_SIZE(rtq6056_samp_freq_list));
ret = regmap_field_write(rm_field, selector);
if (ret)
return ret;
*ct = 1000000 / rtq6056_samp_freq_list[selector];
return 0;
}
/*
* Available averaging rate for rtq6056. The indices correspond with the bit
* value expected by the chip. And it can be found at
* https://www.richtek.com/assets/product_file/RTQ6056/DSQ6056-00.pdf
*/
static const int rtq6056_avg_sample_list[] = {
1, 4, 16, 64, 128, 256, 512, 1024,
};
static int rtq6056_adc_set_average(struct rtq6056_priv *priv, int val)
{
unsigned int selector;
int ret;
if (val > 1024 || val < 1)
return -EINVAL;
selector = find_closest(val, rtq6056_avg_sample_list,
ARRAY_SIZE(rtq6056_avg_sample_list));
ret = regmap_field_write(priv->rm_fields[F_AVG], selector);
if (ret)
return ret;
priv->avg_sample = rtq6056_avg_sample_list[selector];
return 0;
}
static int rtq6056_adc_get_sample_freq(struct rtq6056_priv *priv,
struct iio_chan_spec const *ch, int *val)
{
int sample_time;
if (ch->address == RTQ6056_REG_SHUNTVOLT)
sample_time = priv->vshuntct_us;
else if (ch->address == RTQ6056_REG_BUSVOLT)
sample_time = priv->vbusct_us;
else {
sample_time = priv->vshuntct_us + priv->vbusct_us;
sample_time *= priv->avg_sample;
}
*val = 1000000 / sample_time;
return IIO_VAL_INT;
}
static int rtq6056_adc_read_raw(struct iio_dev *indio_dev,
struct iio_chan_spec const *chan, int *val,
int *val2, long mask)
{
struct rtq6056_priv *priv = iio_priv(indio_dev);
switch (mask) {
case IIO_CHAN_INFO_RAW:
return rtq6056_adc_read_channel(priv, chan, val);
case IIO_CHAN_INFO_SCALE:
return rtq6056_adc_read_scale(chan, val, val2);
case IIO_CHAN_INFO_OVERSAMPLING_RATIO:
*val = priv->avg_sample;
return IIO_VAL_INT;
case IIO_CHAN_INFO_SAMP_FREQ:
return rtq6056_adc_get_sample_freq(priv, chan, val);
default:
return -EINVAL;
}
}
static int rtq6056_adc_read_avail(struct iio_dev *indio_dev,
struct iio_chan_spec const *chan,
const int **vals, int *type, int *length,
long mask)
{
switch (mask) {
case IIO_CHAN_INFO_SAMP_FREQ:
*vals = rtq6056_samp_freq_list;
*type = IIO_VAL_INT;
*length = ARRAY_SIZE(rtq6056_samp_freq_list);
return IIO_AVAIL_LIST;
case IIO_CHAN_INFO_OVERSAMPLING_RATIO:
*vals = rtq6056_avg_sample_list;
*type = IIO_VAL_INT;
*length = ARRAY_SIZE(rtq6056_avg_sample_list);
return IIO_AVAIL_LIST;
default:
return -EINVAL;
}
}
static int rtq6056_adc_write_raw(struct iio_dev *indio_dev,
struct iio_chan_spec const *chan, int val,
int val2, long mask)
{
struct rtq6056_priv *priv = iio_priv(indio_dev);
int ret;
ret = iio_device_claim_direct_mode(indio_dev);
if (ret)
return ret;
switch (mask) {
case IIO_CHAN_INFO_SAMP_FREQ:
ret = rtq6056_adc_set_samp_freq(priv, chan, val);
break;
case IIO_CHAN_INFO_OVERSAMPLING_RATIO:
ret = rtq6056_adc_set_average(priv, val);
break;
default:
ret = -EINVAL;
break;
}
iio_device_release_direct_mode(indio_dev);
return ret;
}
static const char *rtq6056_channel_labels[RTQ6056_MAX_CHANNEL] = {
[RTQ6056_CH_VSHUNT] = "Vshunt",
[RTQ6056_CH_VBUS] = "Vbus",
[RTQ6056_CH_POWER] = "Power",
[RTQ6056_CH_CURRENT] = "Current",
};
static int rtq6056_adc_read_label(struct iio_dev *indio_dev,
struct iio_chan_spec const *chan,
char *label)
{
return sysfs_emit(label, "%s\n", rtq6056_channel_labels[chan->channel]);
}
static int rtq6056_set_shunt_resistor(struct rtq6056_priv *priv,
int resistor_uohm)
{
unsigned int calib_val;
int ret;
if (resistor_uohm <= 0) {
dev_err(priv->dev, "Invalid resistor [%d]\n", resistor_uohm);
return -EINVAL;
}
/* calibration = 5120000 / (Rshunt (uOhm) * current lsb (1mA)) */
calib_val = 5120000 / resistor_uohm;
ret = regmap_write(priv->regmap, RTQ6056_REG_CALIBRATION, calib_val);
if (ret)
return ret;
priv->shunt_resistor_uohm = resistor_uohm;
return 0;
}
static ssize_t shunt_resistor_show(struct device *dev,
struct device_attribute *attr, char *buf)
{
struct rtq6056_priv *priv = iio_priv(dev_to_iio_dev(dev));
int vals[2] = { priv->shunt_resistor_uohm, 1000000 };
return iio_format_value(buf, IIO_VAL_FRACTIONAL, 1, vals);
}
static ssize_t shunt_resistor_store(struct device *dev,
struct device_attribute *attr,
const char *buf, size_t len)
{
struct iio_dev *indio_dev = dev_to_iio_dev(dev);
struct rtq6056_priv *priv = iio_priv(indio_dev);
int val, val_fract, ret;
ret = iio_device_claim_direct_mode(indio_dev);
if (ret)
return ret;
ret = iio_str_to_fixpoint(buf, 100000, &val, &val_fract);
if (ret)
goto out_store;
ret = rtq6056_set_shunt_resistor(priv, val * 1000000 + val_fract);
out_store:
iio_device_release_direct_mode(indio_dev);
return ret ?: len;
}
static IIO_DEVICE_ATTR_RW(shunt_resistor, 0);
static struct attribute *rtq6056_attributes[] = {
&iio_dev_attr_shunt_resistor.dev_attr.attr,
NULL
};
static const struct attribute_group rtq6056_attribute_group = {
.attrs = rtq6056_attributes,
};
static const struct iio_info rtq6056_info = {
.attrs = &rtq6056_attribute_group,
.read_raw = rtq6056_adc_read_raw,
.read_avail = rtq6056_adc_read_avail,
.write_raw = rtq6056_adc_write_raw,
.read_label = rtq6056_adc_read_label,
};
static irqreturn_t rtq6056_buffer_trigger_handler(int irq, void *p)
{
struct iio_poll_func *pf = p;
struct iio_dev *indio_dev = pf->indio_dev;
struct rtq6056_priv *priv = iio_priv(indio_dev);
struct device *dev = priv->dev;
struct {
u16 vals[RTQ6056_MAX_CHANNEL];
s64 timestamp __aligned(8);
} data;
unsigned int raw;
int i = 0, bit, ret;
memset(&data, 0, sizeof(data));
pm_runtime_get_sync(dev);
for_each_set_bit(bit, indio_dev->active_scan_mask, indio_dev->masklength) {
unsigned int addr = rtq6056_channels[bit].address;
ret = regmap_read(priv->regmap, addr, &raw);
if (ret)
goto out;
data.vals[i++] = raw;
}
iio_push_to_buffers_with_timestamp(indio_dev, &data, iio_get_time_ns(indio_dev));
out:
pm_runtime_mark_last_busy(dev);
pm_runtime_put(dev);
iio_trigger_notify_done(indio_dev->trig);
return IRQ_HANDLED;
}
static void rtq6056_enter_shutdown_state(void *dev)
{
struct rtq6056_priv *priv = dev_get_drvdata(dev);
/* Enter shutdown state */
regmap_field_write(priv->rm_fields[F_OPMODE], 0);
}
static bool rtq6056_is_readable_reg(struct device *dev, unsigned int reg)
{
switch (reg) {
case RTQ6056_REG_CONFIG ... RTQ6056_REG_ALERTLIMIT:
case RTQ6056_REG_MANUFACTID ... RTQ6056_REG_DIEID:
return true;
default:
return false;
}
}
static bool rtq6056_is_writeable_reg(struct device *dev, unsigned int reg)
{
switch (reg) {
case RTQ6056_REG_CONFIG:
case RTQ6056_REG_CALIBRATION ... RTQ6056_REG_ALERTLIMIT:
return true;
default:
return false;
}
}
static const struct regmap_config rtq6056_regmap_config = {
.reg_bits = 8,
.val_bits = 16,
.val_format_endian = REGMAP_ENDIAN_BIG,
.max_register = RTQ6056_REG_DIEID,
.readable_reg = rtq6056_is_readable_reg,
.writeable_reg = rtq6056_is_writeable_reg,
};
static int rtq6056_probe(struct i2c_client *i2c)
{
struct iio_dev *indio_dev;
struct rtq6056_priv *priv;
struct device *dev = &i2c->dev;
struct regmap *regmap;
unsigned int vendor_id, shunt_resistor_uohm;
int ret;
if (!i2c_check_functionality(i2c->adapter, I2C_FUNC_SMBUS_WORD_DATA))
return -EOPNOTSUPP;
indio_dev = devm_iio_device_alloc(dev, sizeof(*priv));
if (!indio_dev)
return -ENOMEM;
priv = iio_priv(indio_dev);
priv->dev = dev;
priv->vshuntct_us = priv->vbusct_us = 1037;
priv->avg_sample = 1;
i2c_set_clientdata(i2c, priv);
regmap = devm_regmap_init_i2c(i2c, &rtq6056_regmap_config);
if (IS_ERR(regmap))
return dev_err_probe(dev, PTR_ERR(regmap),
"Failed to init regmap\n");
priv->regmap = regmap;
ret = regmap_read(regmap, RTQ6056_REG_MANUFACTID, &vendor_id);
if (ret)
return dev_err_probe(dev, ret,
"Failed to get manufacturer info\n");
if (vendor_id != RTQ6056_VENDOR_ID)
return dev_err_probe(dev, -ENODEV,
"Invalid vendor id 0x%04x\n", vendor_id);
ret = devm_regmap_field_bulk_alloc(dev, regmap, priv->rm_fields,
rtq6056_reg_fields, F_MAX_FIELDS);
if (ret)
return dev_err_probe(dev, ret, "Failed to init regmap field\n");
/*
* By default, configure average sample as 1, bus and shunt conversion
* time as 1037 microsecond, and operating mode to all on.
*/
ret = regmap_write(regmap, RTQ6056_REG_CONFIG, RTQ6056_DEFAULT_CONFIG);
if (ret)
return dev_err_probe(dev, ret,
"Failed to enable continuous sensing\n");
ret = devm_add_action_or_reset(dev, rtq6056_enter_shutdown_state, dev);
if (ret)
return ret;
pm_runtime_set_autosuspend_delay(dev, MSEC_PER_SEC);
pm_runtime_use_autosuspend(dev);
pm_runtime_set_active(dev);
pm_runtime_mark_last_busy(dev);
ret = devm_pm_runtime_enable(dev);
if (ret)
return dev_err_probe(dev, ret, "Failed to enable pm_runtime\n");
/* By default, use 2000 micro-Ohm resistor */
shunt_resistor_uohm = 2000;
device_property_read_u32(dev, "shunt-resistor-micro-ohms",
&shunt_resistor_uohm);
ret = rtq6056_set_shunt_resistor(priv, shunt_resistor_uohm);
if (ret)
return dev_err_probe(dev, ret,
"Failed to init shunt resistor\n");
indio_dev->name = "rtq6056";
indio_dev->modes = INDIO_DIRECT_MODE;
indio_dev->channels = rtq6056_channels;
indio_dev->num_channels = ARRAY_SIZE(rtq6056_channels);
indio_dev->info = &rtq6056_info;
ret = devm_iio_triggered_buffer_setup(dev, indio_dev, NULL,
rtq6056_buffer_trigger_handler,
NULL);
if (ret)
return dev_err_probe(dev, ret,
"Failed to allocate iio trigger buffer\n");
return devm_iio_device_register(dev, indio_dev);
}
static int rtq6056_runtime_suspend(struct device *dev)
{
struct rtq6056_priv *priv = dev_get_drvdata(dev);
/* Configure to shutdown mode */
return regmap_field_write(priv->rm_fields[F_OPMODE], 0);
}
static int rtq6056_runtime_resume(struct device *dev)
{
struct rtq6056_priv *priv = dev_get_drvdata(dev);
int sample_rdy_time_us, ret;
ret = regmap_field_write(priv->rm_fields[F_OPMODE], RTQ6056_CONT_ALLON);
if (ret)
return ret;
sample_rdy_time_us = priv->vbusct_us + priv->vshuntct_us;
sample_rdy_time_us *= priv->avg_sample;
usleep_range(sample_rdy_time_us, sample_rdy_time_us + 100);
return 0;
}
static DEFINE_RUNTIME_DEV_PM_OPS(rtq6056_pm_ops, rtq6056_runtime_suspend,
rtq6056_runtime_resume, NULL);
static const struct of_device_id rtq6056_device_match[] = {
{ .compatible = "richtek,rtq6056" },
{}
};
MODULE_DEVICE_TABLE(of, rtq6056_device_match);
static struct i2c_driver rtq6056_driver = {
.driver = {
.name = "rtq6056",
.of_match_table = rtq6056_device_match,
.pm = pm_ptr(&rtq6056_pm_ops),
},
.probe_new = rtq6056_probe,
};
module_i2c_driver(rtq6056_driver);
MODULE_AUTHOR("ChiYuan Huang <cy_huang@richtek.com>");
MODULE_DESCRIPTION("Richtek RTQ6056 Driver");
MODULE_LICENSE("GPL v2");
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