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drivers: adc: adc_ad559x: implement double range option

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Optionally write to ad559x register bit which increases ADC input range
from 0V to 2 x Vref.

Create an ADC API per instance since the double range option and thus
`ref_internal` is instance specific.

The functionality has been tested via double range DAC and wiring IO1 and
IO3:
```
$ dac setup ad5593dac 1 12
$ adc ad5593adc resolution 12
$ adc ad5593adc channel id 3
$ dac write_value ad5593dac 1 0
$ adc ad5593adc read 3
read: 1
$ dac write_value ad5593dac 1 1024
$ adc ad5593adc read 3
read: 1021
$ dac write_value ad5593dac 1 2048
$ adc ad5593adc read 3
read: 2044
$ dac write_value ad5593dac 1 3072
$ adc ad5593adc read 3
read: 3069
$ dac write_value ad5593dac 1 4095
$ adc ad5593adc read 3
read: 4091
```

Signed-off-by: Jeppe Odgaard <jeppe.odgaard@prevas.dk>
This commit is contained in:
Jeppe Odgaard 2024-08-09 15:18:24 +02:00 • committed by Benjamin Cabé
commit c9dc58178a
2 changed files with 33 additions and 7 deletions
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39
drivers/adc/adc_ad559x.c
View file

@ -29,6 +29,7 @@ LOG_MODULE_REGISTER(adc_ad559x, CONFIG_ADC_LOG_LEVEL);
struct adc_ad559x_config {
const struct device *mfd_dev;
bool double_input_range;
};
struct adc_ad559x_data {
@ -240,11 +241,28 @@ static int adc_ad559x_init(const struct device *dev)
struct adc_ad559x_data *data = dev->data;
k_tid_t tid;
int ret;
uint16_t reg_val;
if (!device_is_ready(config->mfd_dev)) {
return -ENODEV;
}
ret = mfd_ad559x_read_reg(config->mfd_dev, AD559X_REG_GEN_CTRL, 0, &reg_val);
if (ret < 0) {
return ret;
}
if (config->double_input_range) {
reg_val |= AD559X_ADC_RANGE;
} else {
reg_val &= ~AD559X_ADC_RANGE;
}
ret = mfd_ad559x_write_reg(config->mfd_dev, AD559X_REG_GEN_CTRL, reg_val);
if (ret < 0) {
return ret;
}
ret = mfd_ad559x_write_reg(config->mfd_dev, AD559X_REG_PD_REF_CTRL, AD559X_EN_REF);
if (ret < 0) {
return ret;
@ -272,24 +290,31 @@ static int adc_ad559x_init(const struct device *dev)
return 0;
}
static const struct adc_driver_api adc_ad559x_api = {
.channel_setup = adc_ad559x_channel_setup,
.read = adc_ad559x_read,
#ifdef CONFIG_ADC_ASYNC
.read_async = adc_ad559x_read_async,
#define ADC_AD559X_ASYNC() .read_async = adc_ad559x_read_async,
#else
#define ADC_AD559X_ASYNC()
#endif
.ref_internal = AD559X_ADC_VREF_MV,
};
#define ADC_AD559X_DRIVER_API(inst) \
static const struct adc_driver_api adc_ad559x_api##inst = { \
.channel_setup = adc_ad559x_channel_setup, \
.read = adc_ad559x_read, \
.ref_internal = AD559X_ADC_VREF_MV * (1 + DT_INST_PROP(inst, double_input_range)), \
ADC_AD559X_ASYNC()}
#define ADC_AD559X_DEFINE(inst) \
ADC_AD559X_DRIVER_API(inst); \
\
static const struct adc_ad559x_config adc_ad559x_config##inst = { \
.mfd_dev = DEVICE_DT_GET(DT_INST_PARENT(inst)), \
.double_input_range = DT_INST_PROP(inst, double_input_range), \
}; \
\
static struct adc_ad559x_data adc_ad559x_data##inst; \
\
DEVICE_DT_INST_DEFINE(inst, adc_ad559x_init, NULL, &adc_ad559x_data##inst, \
&adc_ad559x_config##inst, POST_KERNEL, CONFIG_MFD_INIT_PRIORITY, \
&adc_ad559x_api);
&adc_ad559x_api##inst);
DT_INST_FOREACH_STATUS_OKAY(ADC_AD559X_DEFINE)

1
include/zephyr/drivers/mfd/ad559x.h
View file

@ -25,6 +25,7 @@ extern "C" {
#define AD559X_REG_IO_TS_CONFIG 0x0DU
#define AD559X_DAC_RANGE BIT(4)
#define AD559X_ADC_RANGE BIT(5)
#define AD559X_EN_REF BIT(9)
#define AD559X_PIN_MAX 8U