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171 lines
4.0 KiB
171 lines
4.0 KiB
// 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 <[email protected]> |
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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 void ad5592r_spi_remove(struct spi_device *spi) |
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{ |
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ad5592r_remove(&spi->dev); |
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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 <[email protected]>"); |
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MODULE_DESCRIPTION("Analog Devices AD5592R multi-channel converters"); |
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MODULE_LICENSE("GPL v2"); |
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MODULE_IMPORT_NS(IIO_AD5592R);
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