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iio: adc: Add support for AD7091R-8

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Add support for Analog Devices AD7091R-2, AD7091R-4, and AD7091R-8
low power 12-Bit SAR ADCs with SPI interface.
Extend ad7091r-base driver so it can be used by the AD7091R-8 driver.

Signed-off-by: Marcelo Schmitt <marcelo.schmitt@analog.com>
Link: https://lore.kernel.org/r/09d1d1c4b39cecc528488efac6094233715f5659.1703013352.git.marcelo.schmitt1@gmail.com
Signed-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>
This commit is contained in:
Marcelo Schmitt 2023-12-19 17:32:36 -03:00 committed by Jonathan Cameron
parent 6875b85729
commit 0b76ff46c4
5 changed files with 297 additions and 0 deletions
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12
drivers/iio/adc/Kconfig
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@ -47,6 +47,18 @@ config AD7091R5
help
Say yes here to build support for Analog Devices AD7091R-5 ADC.
config AD7091R8
tristate "Analog Devices AD7091R8 ADC Driver"
depends on SPI
select AD7091R
select REGMAP_SPI
help
Say yes here to build support for Analog Devices AD7091R-2, AD7091R-4,
and AD7091R-8 ADC.
To compile this driver as a module, choose M here: the module will be
called ad7091r8.
config AD7124
tristate "Analog Devices AD7124 and similar sigma-delta ADCs driver"
depends on SPI_MASTER

1
drivers/iio/adc/Makefile
View File

@ -9,6 +9,7 @@ obj-$(CONFIG_AD_SIGMA_DELTA) += ad_sigma_delta.o
obj-$(CONFIG_AD4130) += ad4130.o
obj-$(CONFIG_AD7091R) += ad7091r-base.o
obj-$(CONFIG_AD7091R5) += ad7091r5.o
obj-$(CONFIG_AD7091R8) += ad7091r8.o
obj-$(CONFIG_AD7124) += ad7124.o
obj-$(CONFIG_AD7192) += ad7192.o
obj-$(CONFIG_AD7266) += ad7266.o

6
drivers/iio/adc/ad7091r-base.c
View File

@ -322,6 +322,12 @@ int ad7091r_probe(struct device *dev, const struct ad7091r_init_info *init_info,
iio_dev->info = &ad7091r_info;
iio_dev->modes = INDIO_DIRECT_MODE;
if (init_info->setup) {
ret = init_info->setup(st);
if (ret < 0)
return ret;
}
if (irq) {
st->chip_info = init_info->info_irq;
ret = regmap_update_bits(st->map, AD7091R_REG_CONF,

6
drivers/iio/adc/ad7091r-base.h
View File

@ -49,6 +49,7 @@
}
struct device;
struct gpio_desc;
enum ad7091r_mode {
AD7091R_MODE_SAMPLE,
@ -59,10 +60,14 @@ enum ad7091r_mode {
struct ad7091r_state {
struct device *dev;
struct regmap *map;
struct gpio_desc *convst_gpio;
struct gpio_desc *reset_gpio;
struct regulator *vref;
const struct ad7091r_chip_info *chip_info;
enum ad7091r_mode mode;
struct mutex lock; /*lock to prevent concurent reads */
__be16 tx_buf __aligned(IIO_DMA_MINALIGN);
__be16 rx_buf;
};
struct ad7091r_chip_info {
@ -80,6 +85,7 @@ struct ad7091r_init_info {
const struct regmap_config *regmap_config;
void (*init_adc_regmap)(struct ad7091r_state *st,
const struct regmap_config *regmap_conf);
int (*setup)(struct ad7091r_state *st);
};
extern const struct iio_event_spec ad7091r_events[3];

272
drivers/iio/adc/ad7091r8.c Normal file
View File

@ -0,0 +1,272 @@
// SPDX-License-Identifier: GPL-2.0
/*
* Analog Devices AD7091R8 12-bit SAR ADC driver
*
* Copyright 2023 Analog Devices Inc.
*/
#include <linux/bitfield.h>
#include <linux/iio/iio.h>
#include <linux/module.h>
#include <linux/regmap.h>
#include <linux/gpio/consumer.h>
#include <linux/spi/spi.h>
#include "ad7091r-base.h"
#define AD7091R8_REG_ADDR_MSK GENMASK(15, 11)
#define AD7091R8_RD_WR_FLAG_MSK BIT(10)
#define AD7091R8_REG_DATA_MSK GENMASK(9, 0)
#define AD7091R_SPI_REGMAP_CONFIG(n) { \
.reg_bits = 8, \
.val_bits = 16, \
.volatile_reg = ad7091r_volatile_reg, \
.writeable_reg = ad7091r_writeable_reg, \
.max_register = AD7091R_REG_CH_HYSTERESIS(n), \
}
static int ad7091r8_set_mode(struct ad7091r_state *st, enum ad7091r_mode mode)
{
/* AD7091R-2/-4/-8 don't set sample/command/autocycle mode in conf reg */
st->mode = mode;
return 0;
}
static unsigned int ad7091r8_reg_result_chan_id(unsigned int val)
{
return AD7091R8_REG_RESULT_CH_ID(val);
}
#define AD7091R_SPI_CHIP_INFO(_n, _name) { \
.name = _name, \
.channels = ad7091r##_n##_channels, \
.num_channels = ARRAY_SIZE(ad7091r##_n##_channels), \
.vref_mV = 2500, \
.reg_result_chan_id = &ad7091r8_reg_result_chan_id, \
.set_mode = &ad7091r8_set_mode, \
}
#define AD7091R_SPI_CHIP_INFO_IRQ(_n, _name) { \
.name = _name, \
.channels = ad7091r##_n##_channels_irq, \
.num_channels = ARRAY_SIZE(ad7091r##_n##_channels_irq), \
.vref_mV = 2500, \
.reg_result_chan_id = &ad7091r8_reg_result_chan_id, \
.set_mode = &ad7091r8_set_mode, \
}
enum ad7091r8_info_ids {
AD7091R2_INFO,
AD7091R4_INFO,
AD7091R4_INFO_IRQ,
AD7091R8_INFO,
AD7091R8_INFO_IRQ,
};
static const struct iio_chan_spec ad7091r2_channels[] = {
AD7091R_CHANNEL(0, 12, NULL, 0),
AD7091R_CHANNEL(1, 12, NULL, 0),
};
static const struct iio_chan_spec ad7091r4_channels[] = {
AD7091R_CHANNEL(0, 12, NULL, 0),
AD7091R_CHANNEL(1, 12, NULL, 0),
AD7091R_CHANNEL(2, 12, NULL, 0),
AD7091R_CHANNEL(3, 12, NULL, 0),
};
static const struct iio_chan_spec ad7091r4_channels_irq[] = {
AD7091R_CHANNEL(0, 12, ad7091r_events, ARRAY_SIZE(ad7091r_events)),
AD7091R_CHANNEL(1, 12, ad7091r_events, ARRAY_SIZE(ad7091r_events)),
AD7091R_CHANNEL(2, 12, ad7091r_events, ARRAY_SIZE(ad7091r_events)),
AD7091R_CHANNEL(3, 12, ad7091r_events, ARRAY_SIZE(ad7091r_events)),
};
static const struct iio_chan_spec ad7091r8_channels[] = {
AD7091R_CHANNEL(0, 12, NULL, 0),
AD7091R_CHANNEL(1, 12, NULL, 0),
AD7091R_CHANNEL(2, 12, NULL, 0),
AD7091R_CHANNEL(3, 12, NULL, 0),
AD7091R_CHANNEL(4, 12, NULL, 0),
AD7091R_CHANNEL(5, 12, NULL, 0),
AD7091R_CHANNEL(6, 12, NULL, 0),
AD7091R_CHANNEL(7, 12, NULL, 0),
};
static const struct iio_chan_spec ad7091r8_channels_irq[] = {
AD7091R_CHANNEL(0, 12, ad7091r_events, ARRAY_SIZE(ad7091r_events)),
AD7091R_CHANNEL(1, 12, ad7091r_events, ARRAY_SIZE(ad7091r_events)),
AD7091R_CHANNEL(2, 12, ad7091r_events, ARRAY_SIZE(ad7091r_events)),
AD7091R_CHANNEL(3, 12, ad7091r_events, ARRAY_SIZE(ad7091r_events)),
AD7091R_CHANNEL(4, 12, ad7091r_events, ARRAY_SIZE(ad7091r_events)),
AD7091R_CHANNEL(5, 12, ad7091r_events, ARRAY_SIZE(ad7091r_events)),
AD7091R_CHANNEL(6, 12, ad7091r_events, ARRAY_SIZE(ad7091r_events)),
AD7091R_CHANNEL(7, 12, ad7091r_events, ARRAY_SIZE(ad7091r_events)),
};
static void ad7091r_pulse_convst(struct ad7091r_state *st)
{
gpiod_set_value_cansleep(st->convst_gpio, 1);
gpiod_set_value_cansleep(st->convst_gpio, 0);
}
static int ad7091r_regmap_bus_reg_read(void *context, unsigned int reg,
unsigned int *val)
{
struct ad7091r_state *st = context;
struct spi_device *spi = container_of(st->dev, struct spi_device, dev);
int ret;
struct spi_transfer t[] = {
{
.tx_buf = &st->tx_buf,
.len = 2,
.cs_change = 1,
}, {
.rx_buf = &st->rx_buf,
.len = 2,
}
};
if (reg == AD7091R_REG_RESULT)
ad7091r_pulse_convst(st);
st->tx_buf = cpu_to_be16(reg << 11);
ret = spi_sync_transfer(spi, t, ARRAY_SIZE(t));
if (ret < 0)
return ret;
*val = be16_to_cpu(st->rx_buf);
return 0;
}
static int ad7091r_regmap_bus_reg_write(void *context, unsigned int reg,
unsigned int val)
{
struct ad7091r_state *st = context;
struct spi_device *spi = container_of(st->dev, struct spi_device, dev);
/*
* AD7091R-2/-4/-8 protocol (datasheet page 31) is to do a single SPI
* transfer with reg address set in bits B15:B11 and value set in B9:B0.
*/
st->tx_buf = cpu_to_be16(FIELD_PREP(AD7091R8_REG_DATA_MSK, val) |
FIELD_PREP(AD7091R8_RD_WR_FLAG_MSK, 1) |
FIELD_PREP(AD7091R8_REG_ADDR_MSK, reg));
return spi_write(spi, &st->tx_buf, 2);
}
static struct regmap_bus ad7091r8_regmap_bus = {
.reg_read = ad7091r_regmap_bus_reg_read,
.reg_write = ad7091r_regmap_bus_reg_write,
.reg_format_endian_default = REGMAP_ENDIAN_BIG,
.val_format_endian_default = REGMAP_ENDIAN_BIG,
};
static const struct ad7091r_chip_info ad7091r8_infos[] = {
[AD7091R2_INFO] = AD7091R_SPI_CHIP_INFO(2, "ad7091r-2"),
[AD7091R4_INFO] = AD7091R_SPI_CHIP_INFO(4, "ad7091r-4"),
[AD7091R4_INFO_IRQ] = AD7091R_SPI_CHIP_INFO_IRQ(4, "ad7091r-4"),
[AD7091R8_INFO] = AD7091R_SPI_CHIP_INFO(8, "ad7091r-8"),
[AD7091R8_INFO_IRQ] = AD7091R_SPI_CHIP_INFO_IRQ(8, "ad7091r-8")
};
static const struct regmap_config ad7091r2_reg_conf = AD7091R_SPI_REGMAP_CONFIG(2);
static const struct regmap_config ad7091r4_reg_conf = AD7091R_SPI_REGMAP_CONFIG(4);
static const struct regmap_config ad7091r8_reg_conf = AD7091R_SPI_REGMAP_CONFIG(8);
static void ad7091r8_regmap_init(struct ad7091r_state *st,
const struct regmap_config *regmap_conf)
{
st->map = devm_regmap_init(st->dev, &ad7091r8_regmap_bus, st,
regmap_conf);
}
static int ad7091r8_gpio_setup(struct ad7091r_state *st)
{
st->convst_gpio = devm_gpiod_get(st->dev, "convst", GPIOD_OUT_LOW);
if (IS_ERR(st->convst_gpio))
return dev_err_probe(st->dev, PTR_ERR(st->convst_gpio),
"Error getting convst GPIO\n");
st->reset_gpio = devm_gpiod_get_optional(st->dev, "reset",
GPIOD_OUT_HIGH);
if (IS_ERR(st->reset_gpio))
return dev_err_probe(st->dev, PTR_ERR(st->convst_gpio),
"Error on requesting reset GPIO\n");
if (st->reset_gpio) {
fsleep(20);
gpiod_set_value_cansleep(st->reset_gpio, 0);
}
return 0;
}
static struct ad7091r_init_info ad7091r2_init_info = {
.info_no_irq = &ad7091r8_infos[AD7091R2_INFO],
.regmap_config = &ad7091r2_reg_conf,
.init_adc_regmap = &ad7091r8_regmap_init,
.setup = &ad7091r8_gpio_setup
};
static struct ad7091r_init_info ad7091r4_init_info = {
.info_no_irq = &ad7091r8_infos[AD7091R4_INFO],
.info_irq = &ad7091r8_infos[AD7091R4_INFO_IRQ],
.regmap_config = &ad7091r4_reg_conf,
.init_adc_regmap = &ad7091r8_regmap_init,
.setup = &ad7091r8_gpio_setup
};
static struct ad7091r_init_info ad7091r8_init_info = {
.info_no_irq = &ad7091r8_infos[AD7091R8_INFO],
.info_irq = &ad7091r8_infos[AD7091R8_INFO_IRQ],
.regmap_config = &ad7091r8_reg_conf,
.init_adc_regmap = &ad7091r8_regmap_init,
.setup = &ad7091r8_gpio_setup
};
static int ad7091r8_spi_probe(struct spi_device *spi)
{
const struct ad7091r_init_info *init_info;
init_info = spi_get_device_match_data(spi);
if (!init_info)
return -EINVAL;
return ad7091r_probe(&spi->dev, init_info, spi->irq);
}
static const struct of_device_id ad7091r8_of_match[] = {
{ .compatible = "adi,ad7091r2", .data = &ad7091r2_init_info },
{ .compatible = "adi,ad7091r4", .data = &ad7091r4_init_info },
{ .compatible = "adi,ad7091r8", .data = &ad7091r8_init_info },
{ }
};
MODULE_DEVICE_TABLE(of, ad7091r8_of_match);
static const struct spi_device_id ad7091r8_spi_id[] = {
{ "ad7091r2", (kernel_ulong_t)&ad7091r2_init_info },
{ "ad7091r4", (kernel_ulong_t)&ad7091r4_init_info },
{ "ad7091r8", (kernel_ulong_t)&ad7091r8_init_info },
{ }
};
MODULE_DEVICE_TABLE(spi, ad7091r8_spi_id);
static struct spi_driver ad7091r8_driver = {
.driver = {
.name = "ad7091r8",
.of_match_table = ad7091r8_of_match,
},
.probe = ad7091r8_spi_probe,
.id_table = ad7091r8_spi_id,
};
module_spi_driver(ad7091r8_driver);
MODULE_AUTHOR("Marcelo Schmitt <marcelo.schmitt@analog.com>");
MODULE_DESCRIPTION("Analog Devices AD7091R8 ADC driver");
MODULE_LICENSE("GPL");
MODULE_IMPORT_NS(IIO_AD7091R);