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1// SPDX-License-Identifier: GPL-2.0-or-later2/*3 * Driver for the Analog Devices digital potentiometers (SPI bus)4 *5 * Copyright (C) 2010-2011 Michael Hennerich, Analog Devices Inc.6 */7 8#include <linux/spi/spi.h>9#include <linux/module.h>10 11#include "ad525x_dpot.h"12 13/* SPI bus functions */14static int write8(void *client, u8 val)15{16 u8 data = val;17 18 return spi_write(client, &data, 1);19}20 21static int write16(void *client, u8 reg, u8 val)22{23 u8 data[2] = {reg, val};24 25 return spi_write(client, data, 2);26}27 28static int write24(void *client, u8 reg, u16 val)29{30 u8 data[3] = {reg, val >> 8, val};31 32 return spi_write(client, data, 3);33}34 35static int read8(void *client)36{37 int ret;38 u8 data;39 40 ret = spi_read(client, &data, 1);41 if (ret < 0)42 return ret;43 44 return data;45}46 47static int read16(void *client, u8 reg)48{49 int ret;50 u8 buf_rx[2];51 52 write16(client, reg, 0);53 ret = spi_read(client, buf_rx, 2);54 if (ret < 0)55 return ret;56 57 return (buf_rx[0] << 8) | buf_rx[1];58}59 60static int read24(void *client, u8 reg)61{62 int ret;63 u8 buf_rx[3];64 65 write24(client, reg, 0);66 ret = spi_read(client, buf_rx, 3);67 if (ret < 0)68 return ret;69 70 return (buf_rx[1] << 8) | buf_rx[2];71}72 73static const struct ad_dpot_bus_ops bops = {74 .read_d8 = read8,75 .read_r8d8 = read16,76 .read_r8d16 = read24,77 .write_d8 = write8,78 .write_r8d8 = write16,79 .write_r8d16 = write24,80};81static int ad_dpot_spi_probe(struct spi_device *spi)82{83 struct ad_dpot_bus_data bdata = {84 .client = spi,85 .bops = &bops,86 };87 88 return ad_dpot_probe(&spi->dev, &bdata,89 spi_get_device_id(spi)->driver_data,90 spi_get_device_id(spi)->name);91}92 93static void ad_dpot_spi_remove(struct spi_device *spi)94{95 ad_dpot_remove(&spi->dev);96}97 98static const struct spi_device_id ad_dpot_spi_id[] = {99 {"ad5160", AD5160_ID},100 {"ad5161", AD5161_ID},101 {"ad5162", AD5162_ID},102 {"ad5165", AD5165_ID},103 {"ad5200", AD5200_ID},104 {"ad5201", AD5201_ID},105 {"ad5203", AD5203_ID},106 {"ad5204", AD5204_ID},107 {"ad5206", AD5206_ID},108 {"ad5207", AD5207_ID},109 {"ad5231", AD5231_ID},110 {"ad5232", AD5232_ID},111 {"ad5233", AD5233_ID},112 {"ad5235", AD5235_ID},113 {"ad5260", AD5260_ID},114 {"ad5262", AD5262_ID},115 {"ad5263", AD5263_ID},116 {"ad5290", AD5290_ID},117 {"ad5291", AD5291_ID},118 {"ad5292", AD5292_ID},119 {"ad5293", AD5293_ID},120 {"ad7376", AD7376_ID},121 {"ad8400", AD8400_ID},122 {"ad8402", AD8402_ID},123 {"ad8403", AD8403_ID},124 {"adn2850", ADN2850_ID},125 {"ad5270", AD5270_ID},126 {"ad5271", AD5271_ID},127 {}128};129MODULE_DEVICE_TABLE(spi, ad_dpot_spi_id);130 131static struct spi_driver ad_dpot_spi_driver = {132 .driver = {133 .name = "ad_dpot",134 },135 .probe = ad_dpot_spi_probe,136 .remove = ad_dpot_spi_remove,137 .id_table = ad_dpot_spi_id,138};139 140module_spi_driver(ad_dpot_spi_driver);141 142MODULE_AUTHOR("Michael Hennerich <michael.hennerich@analog.com>");143MODULE_DESCRIPTION("digital potentiometer SPI bus driver");144MODULE_LICENSE("GPL");145MODULE_ALIAS("spi:ad_dpot");146