// SPDX-License-Identifier: GPL-2.0-or-later /* * Driver for the Analog Devices digital potentiometers (SPI bus) * * Copyright (C) 2010-2011 Michael Hennerich, Analog Devices Inc. */ #include <linux/spi/spi.h> #include <linux/module.h> #include "ad525x_dpot.h" /* SPI bus functions */ static int write8(void *client, u8 val) { u8 data = val; return spi_write(client, &data, 1); } static int write16(void *client, u8 reg, u8 val) { u8 data[2] = {reg, val}; return spi_write(client, data, 2); } static int write24(void *client, u8 reg, u16 val) { u8 data[3] = {reg, val >> 8, val}; return spi_write(client, data, 3); } static int read8(void *client) { int ret; u8 data; ret = spi_read(client, &data, 1); if (ret < 0) return ret; return data; } static int read16(void *client, u8 reg) { int ret; u8 buf_rx[2]; write16(client, reg, 0); ret = spi_read(client, buf_rx, 2); if (ret < 0) return ret; return (buf_rx[0] << 8) | buf_rx[1]; } static int read24(void *client, u8 reg) { int ret; u8 buf_rx[3]; write24(client, reg, 0); ret = spi_read(client, buf_rx, 3); if (ret < 0) return ret; return (buf_rx[1] << 8) | buf_rx[2]; } static const struct ad_dpot_bus_ops bops = { .read_d8 = read8, .read_r8d8 = read16, .read_r8d16 = read24, .write_d8 = write8, .write_r8d8 = write16, .write_r8d16 = write24, }; static int ad_dpot_spi_probe(struct spi_device *spi) { struct ad_dpot_bus_data bdata = { .client = spi, .bops = &bops, }; return ad_dpot_probe(&spi->dev, &bdata, spi_get_device_id(spi)->driver_data, spi_get_device_id(spi)->name); } static void ad_dpot_spi_remove(struct spi_device *spi) { ad_dpot_remove(&spi->dev); } static const struct spi_device_id ad_dpot_spi_id[] = { {"ad5160", AD5160_ID}, {"ad5161", AD5161_ID}, {"ad5162", AD5162_ID}, {"ad5165", AD5165_ID}, {"ad5200", AD5200_ID}, {"ad5201", AD5201_ID}, {"ad5203", AD5203_ID}, {"ad5204", AD5204_ID}, {"ad5206", AD5206_ID}, {"ad5207", AD5207_ID}, {"ad5231", AD5231_ID}, {"ad5232", AD5232_ID}, {"ad5233", AD5233_ID}, {"ad5235", AD5235_ID}, {"ad5260", AD5260_ID}, {"ad5262", AD5262_ID}, {"ad5263", AD5263_ID}, {"ad5290", AD5290_ID}, {"ad5291", AD5291_ID}, {"ad5292", AD5292_ID}, {"ad5293", AD5293_ID}, {"ad7376", AD7376_ID}, {"ad8400", AD8400_ID}, {"ad8402", AD8402_ID}, {"ad8403", AD8403_ID}, {"adn2850", ADN2850_ID}, {"ad5270", AD5270_ID}, {"ad5271", AD5271_ID}, {} }; MODULE_DEVICE_TABLE(spi, ad_dpot_spi_id); static struct spi_driver ad_dpot_spi_driver = { .driver = { .name = "ad_dpot", }, .probe = ad_dpot_spi_probe, .remove = ad_dpot_spi_remove, .id_table = ad_dpot_spi_id, }; module_spi_driver(ad_dpot_spi_driver); MODULE_AUTHOR("Michael Hennerich <michael.hennerich@analog.com>"); MODULE_DESCRIPTION("digital potentiometer SPI bus driver"); MODULE_LICENSE("GPL"); MODULE_ALIAS("spi:ad_dpot");