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85385a51ce
Up to now ad_dpot_remove() returns zero unconditionally. Make it return void instead which makes it easier to see in the callers that there is no error to handle. Also the return value of i2c and spi remove callbacks is ignored anyway. Signed-off-by: Uwe Kleine-König <u.kleine-koenig@pengutronix.de> Link: https://lore.kernel.org/r/20211012153945.2651412-12-u.kleine-koenig@pengutronix.de Acked-by: Michael Hennerich <michael.hennerich@analog.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
147 lines
2.8 KiB
C
147 lines
2.8 KiB
C
// 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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ad_dpot_remove(&spi->dev);
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return 0;
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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 <michael.hennerich@analog.com>");
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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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