273 lines · c
1// SPDX-License-Identifier: GPL-2.02/*3 * Analog Devices AD7091R8 12-bit SAR ADC driver4 *5 * Copyright 2023 Analog Devices Inc.6 */7 8#include <linux/bitfield.h>9#include <linux/iio/iio.h>10#include <linux/module.h>11#include <linux/regmap.h>12#include <linux/gpio/consumer.h>13#include <linux/spi/spi.h>14 15#include "ad7091r-base.h"16 17#define AD7091R8_REG_ADDR_MSK GENMASK(15, 11)18#define AD7091R8_RD_WR_FLAG_MSK BIT(10)19#define AD7091R8_REG_DATA_MSK GENMASK(9, 0)20 21#define AD7091R_SPI_REGMAP_CONFIG(n) { \22 .reg_bits = 8, \23 .val_bits = 16, \24 .volatile_reg = ad7091r_volatile_reg, \25 .writeable_reg = ad7091r_writeable_reg, \26 .max_register = AD7091R_REG_CH_HYSTERESIS(n), \27}28 29static int ad7091r8_set_mode(struct ad7091r_state *st, enum ad7091r_mode mode)30{31 /* AD7091R-2/-4/-8 don't set sample/command/autocycle mode in conf reg */32 st->mode = mode;33 return 0;34}35 36static unsigned int ad7091r8_reg_result_chan_id(unsigned int val)37{38 return AD7091R8_REG_RESULT_CH_ID(val);39}40 41#define AD7091R_SPI_CHIP_INFO(_n, _name) { \42 .name = _name, \43 .channels = ad7091r##_n##_channels, \44 .num_channels = ARRAY_SIZE(ad7091r##_n##_channels), \45 .vref_mV = 2500, \46 .reg_result_chan_id = &ad7091r8_reg_result_chan_id, \47 .set_mode = &ad7091r8_set_mode, \48}49 50#define AD7091R_SPI_CHIP_INFO_IRQ(_n, _name) { \51 .name = _name, \52 .channels = ad7091r##_n##_channels_irq, \53 .num_channels = ARRAY_SIZE(ad7091r##_n##_channels_irq), \54 .vref_mV = 2500, \55 .reg_result_chan_id = &ad7091r8_reg_result_chan_id, \56 .set_mode = &ad7091r8_set_mode, \57}58 59enum ad7091r8_info_ids {60 AD7091R2_INFO,61 AD7091R4_INFO,62 AD7091R4_INFO_IRQ,63 AD7091R8_INFO,64 AD7091R8_INFO_IRQ,65};66 67static const struct iio_chan_spec ad7091r2_channels[] = {68 AD7091R_CHANNEL(0, 12, NULL, 0),69 AD7091R_CHANNEL(1, 12, NULL, 0),70};71 72static const struct iio_chan_spec ad7091r4_channels[] = {73 AD7091R_CHANNEL(0, 12, NULL, 0),74 AD7091R_CHANNEL(1, 12, NULL, 0),75 AD7091R_CHANNEL(2, 12, NULL, 0),76 AD7091R_CHANNEL(3, 12, NULL, 0),77};78 79static const struct iio_chan_spec ad7091r4_channels_irq[] = {80 AD7091R_CHANNEL(0, 12, ad7091r_events, ARRAY_SIZE(ad7091r_events)),81 AD7091R_CHANNEL(1, 12, ad7091r_events, ARRAY_SIZE(ad7091r_events)),82 AD7091R_CHANNEL(2, 12, ad7091r_events, ARRAY_SIZE(ad7091r_events)),83 AD7091R_CHANNEL(3, 12, ad7091r_events, ARRAY_SIZE(ad7091r_events)),84};85 86static const struct iio_chan_spec ad7091r8_channels[] = {87 AD7091R_CHANNEL(0, 12, NULL, 0),88 AD7091R_CHANNEL(1, 12, NULL, 0),89 AD7091R_CHANNEL(2, 12, NULL, 0),90 AD7091R_CHANNEL(3, 12, NULL, 0),91 AD7091R_CHANNEL(4, 12, NULL, 0),92 AD7091R_CHANNEL(5, 12, NULL, 0),93 AD7091R_CHANNEL(6, 12, NULL, 0),94 AD7091R_CHANNEL(7, 12, NULL, 0),95};96 97static const struct iio_chan_spec ad7091r8_channels_irq[] = {98 AD7091R_CHANNEL(0, 12, ad7091r_events, ARRAY_SIZE(ad7091r_events)),99 AD7091R_CHANNEL(1, 12, ad7091r_events, ARRAY_SIZE(ad7091r_events)),100 AD7091R_CHANNEL(2, 12, ad7091r_events, ARRAY_SIZE(ad7091r_events)),101 AD7091R_CHANNEL(3, 12, ad7091r_events, ARRAY_SIZE(ad7091r_events)),102 AD7091R_CHANNEL(4, 12, ad7091r_events, ARRAY_SIZE(ad7091r_events)),103 AD7091R_CHANNEL(5, 12, ad7091r_events, ARRAY_SIZE(ad7091r_events)),104 AD7091R_CHANNEL(6, 12, ad7091r_events, ARRAY_SIZE(ad7091r_events)),105 AD7091R_CHANNEL(7, 12, ad7091r_events, ARRAY_SIZE(ad7091r_events)),106};107 108static void ad7091r_pulse_convst(struct ad7091r_state *st)109{110 gpiod_set_value_cansleep(st->convst_gpio, 1);111 gpiod_set_value_cansleep(st->convst_gpio, 0);112}113 114static int ad7091r_regmap_bus_reg_read(void *context, unsigned int reg,115 unsigned int *val)116{117 struct ad7091r_state *st = context;118 struct spi_device *spi = container_of(st->dev, struct spi_device, dev);119 int ret;120 121 struct spi_transfer t[] = {122 {123 .tx_buf = &st->tx_buf,124 .len = 2,125 .cs_change = 1,126 }, {127 .rx_buf = &st->rx_buf,128 .len = 2,129 }130 };131 132 if (reg == AD7091R_REG_RESULT)133 ad7091r_pulse_convst(st);134 135 st->tx_buf = cpu_to_be16(reg << 11);136 137 ret = spi_sync_transfer(spi, t, ARRAY_SIZE(t));138 if (ret < 0)139 return ret;140 141 *val = be16_to_cpu(st->rx_buf);142 return 0;143}144 145static int ad7091r_regmap_bus_reg_write(void *context, unsigned int reg,146 unsigned int val)147{148 struct ad7091r_state *st = context;149 struct spi_device *spi = container_of(st->dev, struct spi_device, dev);150 151 /*152 * AD7091R-2/-4/-8 protocol (datasheet page 31) is to do a single SPI153 * transfer with reg address set in bits B15:B11 and value set in B9:B0.154 */155 st->tx_buf = cpu_to_be16(FIELD_PREP(AD7091R8_REG_DATA_MSK, val) |156 FIELD_PREP(AD7091R8_RD_WR_FLAG_MSK, 1) |157 FIELD_PREP(AD7091R8_REG_ADDR_MSK, reg));158 159 return spi_write(spi, &st->tx_buf, 2);160}161 162static const struct regmap_bus ad7091r8_regmap_bus = {163 .reg_read = ad7091r_regmap_bus_reg_read,164 .reg_write = ad7091r_regmap_bus_reg_write,165 .reg_format_endian_default = REGMAP_ENDIAN_BIG,166 .val_format_endian_default = REGMAP_ENDIAN_BIG,167};168 169static const struct ad7091r_chip_info ad7091r8_infos[] = {170 [AD7091R2_INFO] = AD7091R_SPI_CHIP_INFO(2, "ad7091r-2"),171 [AD7091R4_INFO] = AD7091R_SPI_CHIP_INFO(4, "ad7091r-4"),172 [AD7091R4_INFO_IRQ] = AD7091R_SPI_CHIP_INFO_IRQ(4, "ad7091r-4"),173 [AD7091R8_INFO] = AD7091R_SPI_CHIP_INFO(8, "ad7091r-8"),174 [AD7091R8_INFO_IRQ] = AD7091R_SPI_CHIP_INFO_IRQ(8, "ad7091r-8")175};176 177static const struct regmap_config ad7091r2_reg_conf = AD7091R_SPI_REGMAP_CONFIG(2);178static const struct regmap_config ad7091r4_reg_conf = AD7091R_SPI_REGMAP_CONFIG(4);179static const struct regmap_config ad7091r8_reg_conf = AD7091R_SPI_REGMAP_CONFIG(8);180 181static void ad7091r8_regmap_init(struct ad7091r_state *st,182 const struct regmap_config *regmap_conf)183{184 st->map = devm_regmap_init(st->dev, &ad7091r8_regmap_bus, st,185 regmap_conf);186}187 188static int ad7091r8_gpio_setup(struct ad7091r_state *st)189{190 st->convst_gpio = devm_gpiod_get(st->dev, "convst", GPIOD_OUT_LOW);191 if (IS_ERR(st->convst_gpio))192 return dev_err_probe(st->dev, PTR_ERR(st->convst_gpio),193 "Error getting convst GPIO\n");194 195 st->reset_gpio = devm_gpiod_get_optional(st->dev, "reset",196 GPIOD_OUT_HIGH);197 if (IS_ERR(st->reset_gpio))198 return dev_err_probe(st->dev, PTR_ERR(st->reset_gpio),199 "Error on requesting reset GPIO\n");200 201 if (st->reset_gpio) {202 fsleep(20);203 gpiod_set_value_cansleep(st->reset_gpio, 0);204 }205 206 return 0;207}208 209static struct ad7091r_init_info ad7091r2_init_info = {210 .info_no_irq = &ad7091r8_infos[AD7091R2_INFO],211 .regmap_config = &ad7091r2_reg_conf,212 .init_adc_regmap = &ad7091r8_regmap_init,213 .setup = &ad7091r8_gpio_setup214};215 216static struct ad7091r_init_info ad7091r4_init_info = {217 .info_no_irq = &ad7091r8_infos[AD7091R4_INFO],218 .info_irq = &ad7091r8_infos[AD7091R4_INFO_IRQ],219 .regmap_config = &ad7091r4_reg_conf,220 .init_adc_regmap = &ad7091r8_regmap_init,221 .setup = &ad7091r8_gpio_setup222};223 224static struct ad7091r_init_info ad7091r8_init_info = {225 .info_no_irq = &ad7091r8_infos[AD7091R8_INFO],226 .info_irq = &ad7091r8_infos[AD7091R8_INFO_IRQ],227 .regmap_config = &ad7091r8_reg_conf,228 .init_adc_regmap = &ad7091r8_regmap_init,229 .setup = &ad7091r8_gpio_setup230};231 232static int ad7091r8_spi_probe(struct spi_device *spi)233{234 const struct ad7091r_init_info *init_info;235 236 init_info = spi_get_device_match_data(spi);237 if (!init_info)238 return -EINVAL;239 240 return ad7091r_probe(&spi->dev, init_info, spi->irq);241}242 243static const struct of_device_id ad7091r8_of_match[] = {244 { .compatible = "adi,ad7091r2", .data = &ad7091r2_init_info },245 { .compatible = "adi,ad7091r4", .data = &ad7091r4_init_info },246 { .compatible = "adi,ad7091r8", .data = &ad7091r8_init_info },247 { }248};249MODULE_DEVICE_TABLE(of, ad7091r8_of_match);250 251static const struct spi_device_id ad7091r8_spi_id[] = {252 { "ad7091r2", (kernel_ulong_t)&ad7091r2_init_info },253 { "ad7091r4", (kernel_ulong_t)&ad7091r4_init_info },254 { "ad7091r8", (kernel_ulong_t)&ad7091r8_init_info },255 { }256};257MODULE_DEVICE_TABLE(spi, ad7091r8_spi_id);258 259static struct spi_driver ad7091r8_driver = {260 .driver = {261 .name = "ad7091r8",262 .of_match_table = ad7091r8_of_match,263 },264 .probe = ad7091r8_spi_probe,265 .id_table = ad7091r8_spi_id,266};267module_spi_driver(ad7091r8_driver);268 269MODULE_AUTHOR("Marcelo Schmitt <marcelo.schmitt@analog.com>");270MODULE_DESCRIPTION("Analog Devices AD7091R8 ADC driver");271MODULE_LICENSE("GPL");272MODULE_IMPORT_NS(IIO_AD7091R);273