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