| // SPDX-License-Identifier: GPL-2.0-only |
| /* |
| * AD5592R Digital <-> Analog converters driver |
| * |
| * Copyright 2015-2016 Analog Devices Inc. |
| * Author: Paul Cercueil <paul.cercueil@analog.com> |
| */ |
| |
| #include "ad5592r-base.h" |
| |
| #include <linux/bitops.h> |
| #include <linux/module.h> |
| #include <linux/of.h> |
| #include <linux/spi/spi.h> |
| #include <linux/acpi.h> |
| |
| #define AD5592R_GPIO_READBACK_EN BIT(10) |
| #define AD5592R_LDAC_READBACK_EN BIT(6) |
| |
| static int ad5592r_spi_wnop_r16(struct ad5592r_state *st, __be16 *buf) |
| { |
| struct spi_device *spi = container_of(st->dev, struct spi_device, dev); |
| struct spi_transfer t = { |
| .tx_buf = &st->spi_msg_nop, |
| .rx_buf = buf, |
| .len = 2 |
| }; |
| |
| st->spi_msg_nop = 0; /* NOP */ |
| |
| return spi_sync_transfer(spi, &t, 1); |
| } |
| |
| static int ad5592r_write_dac(struct ad5592r_state *st, unsigned chan, u16 value) |
| { |
| struct spi_device *spi = container_of(st->dev, struct spi_device, dev); |
| |
| st->spi_msg = cpu_to_be16(BIT(15) | (chan << 12) | value); |
| |
| return spi_write(spi, &st->spi_msg, sizeof(st->spi_msg)); |
| } |
| |
| static int ad5592r_read_adc(struct ad5592r_state *st, unsigned chan, u16 *value) |
| { |
| struct spi_device *spi = container_of(st->dev, struct spi_device, dev); |
| int ret; |
| |
| st->spi_msg = cpu_to_be16((AD5592R_REG_ADC_SEQ << 11) | BIT(chan)); |
| |
| ret = spi_write(spi, &st->spi_msg, sizeof(st->spi_msg)); |
| if (ret) |
| return ret; |
| |
| /* |
| * Invalid data: |
| * See Figure 40. Single-Channel ADC Conversion Sequence |
| */ |
| ret = ad5592r_spi_wnop_r16(st, &st->spi_msg); |
| if (ret) |
| return ret; |
| |
| ret = ad5592r_spi_wnop_r16(st, &st->spi_msg); |
| if (ret) |
| return ret; |
| |
| *value = be16_to_cpu(st->spi_msg); |
| |
| return 0; |
| } |
| |
| static int ad5592r_reg_write(struct ad5592r_state *st, u8 reg, u16 value) |
| { |
| struct spi_device *spi = container_of(st->dev, struct spi_device, dev); |
| |
| st->spi_msg = cpu_to_be16((reg << 11) | value); |
| |
| return spi_write(spi, &st->spi_msg, sizeof(st->spi_msg)); |
| } |
| |
| static int ad5592r_reg_read(struct ad5592r_state *st, u8 reg, u16 *value) |
| { |
| struct spi_device *spi = container_of(st->dev, struct spi_device, dev); |
| int ret; |
| |
| st->spi_msg = cpu_to_be16((AD5592R_REG_LDAC << 11) | |
| AD5592R_LDAC_READBACK_EN | (reg << 2)); |
| |
| ret = spi_write(spi, &st->spi_msg, sizeof(st->spi_msg)); |
| if (ret) |
| return ret; |
| |
| ret = ad5592r_spi_wnop_r16(st, &st->spi_msg); |
| if (ret) |
| return ret; |
| |
| *value = be16_to_cpu(st->spi_msg); |
| |
| return 0; |
| } |
| |
| static int ad5593r_gpio_read(struct ad5592r_state *st, u8 *value) |
| { |
| int ret; |
| |
| ret = ad5592r_reg_write(st, AD5592R_REG_GPIO_IN_EN, |
| AD5592R_GPIO_READBACK_EN | st->gpio_in); |
| if (ret) |
| return ret; |
| |
| ret = ad5592r_spi_wnop_r16(st, &st->spi_msg); |
| if (ret) |
| return ret; |
| |
| *value = (u8) be16_to_cpu(st->spi_msg); |
| |
| return 0; |
| } |
| |
| static const struct ad5592r_rw_ops ad5592r_rw_ops = { |
| .write_dac = ad5592r_write_dac, |
| .read_adc = ad5592r_read_adc, |
| .reg_write = ad5592r_reg_write, |
| .reg_read = ad5592r_reg_read, |
| .gpio_read = ad5593r_gpio_read, |
| }; |
| |
| static int ad5592r_spi_probe(struct spi_device *spi) |
| { |
| const struct spi_device_id *id = spi_get_device_id(spi); |
| |
| return ad5592r_probe(&spi->dev, id->name, &ad5592r_rw_ops); |
| } |
| |
| static int ad5592r_spi_remove(struct spi_device *spi) |
| { |
| return ad5592r_remove(&spi->dev); |
| } |
| |
| static const struct spi_device_id ad5592r_spi_ids[] = { |
| { .name = "ad5592r", }, |
| {} |
| }; |
| MODULE_DEVICE_TABLE(spi, ad5592r_spi_ids); |
| |
| static const struct of_device_id ad5592r_of_match[] = { |
| { .compatible = "adi,ad5592r", }, |
| {}, |
| }; |
| MODULE_DEVICE_TABLE(of, ad5592r_of_match); |
| |
| static const struct acpi_device_id ad5592r_acpi_match[] = { |
| {"ADS5592", }, |
| { }, |
| }; |
| MODULE_DEVICE_TABLE(acpi, ad5592r_acpi_match); |
| |
| static struct spi_driver ad5592r_spi_driver = { |
| .driver = { |
| .name = "ad5592r", |
| .of_match_table = of_match_ptr(ad5592r_of_match), |
| .acpi_match_table = ACPI_PTR(ad5592r_acpi_match), |
| }, |
| .probe = ad5592r_spi_probe, |
| .remove = ad5592r_spi_remove, |
| .id_table = ad5592r_spi_ids, |
| }; |
| module_spi_driver(ad5592r_spi_driver); |
| |
| MODULE_AUTHOR("Paul Cercueil <paul.cercueil@analog.com>"); |
| MODULE_DESCRIPTION("Analog Devices AD5592R multi-channel converters"); |
| MODULE_LICENSE("GPL v2"); |