diff options
| -rw-r--r-- | drivers/iio/adc/Kconfig | 12 | ||||
| -rw-r--r-- | drivers/iio/adc/Makefile | 1 | ||||
| -rw-r--r-- | drivers/iio/adc/ad7091r-base.c | 6 | ||||
| -rw-r--r-- | drivers/iio/adc/ad7091r-base.h | 6 | ||||
| -rw-r--r-- | drivers/iio/adc/ad7091r8.c | 272 |
5 files changed, 297 insertions, 0 deletions
diff --git a/drivers/iio/adc/Kconfig b/drivers/iio/adc/Kconfig index 9d2d32d09166..3b73c509bd68 100644 --- a/drivers/iio/adc/Kconfig +++ b/drivers/iio/adc/Kconfig @@ -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 diff --git a/drivers/iio/adc/Makefile b/drivers/iio/adc/Makefile index 1e289d674d4d..d2fda54a3259 100644 --- a/drivers/iio/adc/Makefile +++ b/drivers/iio/adc/Makefile @@ -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 diff --git a/drivers/iio/adc/ad7091r-base.c b/drivers/iio/adc/ad7091r-base.c index 665e930d67d0..f4255b91acfc 100644 --- a/drivers/iio/adc/ad7091r-base.c +++ b/drivers/iio/adc/ad7091r-base.c @@ -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, diff --git a/drivers/iio/adc/ad7091r-base.h b/drivers/iio/adc/ad7091r-base.h index b50024ca33e9..696bf7a897bb 100644 --- a/drivers/iio/adc/ad7091r-base.h +++ b/drivers/iio/adc/ad7091r-base.h @@ -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]; diff --git a/drivers/iio/adc/ad7091r8.c b/drivers/iio/adc/ad7091r8.c new file mode 100644 index 000000000000..57700f124803 --- /dev/null +++ b/drivers/iio/adc/ad7091r8.c @@ -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); |