173 lines
3.9 KiB
C
173 lines
3.9 KiB
C
// SPDX-License-Identifier: GPL-2.0-only
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/*
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* AD5592R Digital <-> Analog converters driver
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*
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* Copyright 2015-2016 Analog Devices Inc.
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* Author: Paul Cercueil <paul.cercueil@analog.com>
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*/
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#include "ad5592r-base.h"
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#include <linux/bitops.h>
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#include <linux/module.h>
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#include <linux/mod_devicetable.h>
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#include <linux/spi/spi.h>
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#define AD5592R_GPIO_READBACK_EN BIT(10)
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#define AD5592R_LDAC_READBACK_EN BIT(6)
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static int ad5592r_spi_wnop_r16(struct ad5592r_state *st, __be16 *buf)
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{
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struct spi_device *spi = container_of(st->dev, struct spi_device, dev);
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struct spi_transfer t = {
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.tx_buf = &st->spi_msg_nop,
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.rx_buf = buf,
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.len = 2
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};
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st->spi_msg_nop = 0; /* NOP */
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return spi_sync_transfer(spi, &t, 1);
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}
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static int ad5592r_write_dac(struct ad5592r_state *st, unsigned chan, u16 value)
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{
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struct spi_device *spi = container_of(st->dev, struct spi_device, dev);
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st->spi_msg = cpu_to_be16(BIT(15) | (chan << 12) | value);
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return spi_write(spi, &st->spi_msg, sizeof(st->spi_msg));
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}
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static int ad5592r_read_adc(struct ad5592r_state *st, unsigned chan, u16 *value)
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{
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struct spi_device *spi = container_of(st->dev, struct spi_device, dev);
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int ret;
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st->spi_msg = cpu_to_be16((AD5592R_REG_ADC_SEQ << 11) | BIT(chan));
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ret = spi_write(spi, &st->spi_msg, sizeof(st->spi_msg));
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if (ret)
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return ret;
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/*
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* Invalid data:
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* See Figure 40. Single-Channel ADC Conversion Sequence
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*/
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ret = ad5592r_spi_wnop_r16(st, &st->spi_msg);
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if (ret)
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return ret;
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ret = ad5592r_spi_wnop_r16(st, &st->spi_msg);
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if (ret)
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return ret;
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*value = be16_to_cpu(st->spi_msg);
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return 0;
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}
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static int ad5592r_reg_write(struct ad5592r_state *st, u8 reg, u16 value)
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{
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struct spi_device *spi = container_of(st->dev, struct spi_device, dev);
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st->spi_msg = cpu_to_be16((reg << 11) | value);
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return spi_write(spi, &st->spi_msg, sizeof(st->spi_msg));
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}
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static int ad5592r_reg_read(struct ad5592r_state *st, u8 reg, u16 *value)
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{
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struct spi_device *spi = container_of(st->dev, struct spi_device, dev);
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int ret;
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st->spi_msg = cpu_to_be16((AD5592R_REG_LDAC << 11) |
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AD5592R_LDAC_READBACK_EN | (reg << 2));
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ret = spi_write(spi, &st->spi_msg, sizeof(st->spi_msg));
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if (ret)
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return ret;
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ret = ad5592r_spi_wnop_r16(st, &st->spi_msg);
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if (ret)
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return ret;
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*value = be16_to_cpu(st->spi_msg);
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return 0;
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}
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static int ad5592r_gpio_read(struct ad5592r_state *st, u8 *value)
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{
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int ret;
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ret = ad5592r_reg_write(st, AD5592R_REG_GPIO_IN_EN,
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AD5592R_GPIO_READBACK_EN | st->gpio_in);
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if (ret)
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return ret;
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ret = ad5592r_spi_wnop_r16(st, &st->spi_msg);
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if (ret)
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return ret;
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*value = (u8) be16_to_cpu(st->spi_msg);
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return 0;
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}
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static const struct ad5592r_rw_ops ad5592r_rw_ops = {
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.write_dac = ad5592r_write_dac,
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.read_adc = ad5592r_read_adc,
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.reg_write = ad5592r_reg_write,
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.reg_read = ad5592r_reg_read,
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.gpio_read = ad5592r_gpio_read,
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};
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static int ad5592r_spi_probe(struct spi_device *spi)
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{
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const struct spi_device_id *id = spi_get_device_id(spi);
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return ad5592r_probe(&spi->dev, id->name, &ad5592r_rw_ops);
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}
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static int ad5592r_spi_remove(struct spi_device *spi)
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{
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ad5592r_remove(&spi->dev);
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return 0;
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}
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static const struct spi_device_id ad5592r_spi_ids[] = {
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{ .name = "ad5592r", },
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{}
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};
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MODULE_DEVICE_TABLE(spi, ad5592r_spi_ids);
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static const struct of_device_id ad5592r_of_match[] = {
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{ .compatible = "adi,ad5592r", },
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{},
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};
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MODULE_DEVICE_TABLE(of, ad5592r_of_match);
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static const struct acpi_device_id ad5592r_acpi_match[] = {
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{"ADS5592", },
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{ },
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};
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MODULE_DEVICE_TABLE(acpi, ad5592r_acpi_match);
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static struct spi_driver ad5592r_spi_driver = {
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.driver = {
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.name = "ad5592r",
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.of_match_table = ad5592r_of_match,
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.acpi_match_table = ad5592r_acpi_match,
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},
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.probe = ad5592r_spi_probe,
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.remove = ad5592r_spi_remove,
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.id_table = ad5592r_spi_ids,
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};
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module_spi_driver(ad5592r_spi_driver);
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MODULE_AUTHOR("Paul Cercueil <paul.cercueil@analog.com>");
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MODULE_DESCRIPTION("Analog Devices AD5592R multi-channel converters");
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MODULE_LICENSE("GPL v2");
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