0357e488b8
In this patch restructures the existing ad5686 driver by adding a module for SPI and a header file, while the baseline module deals with the chip-logic. This is a necessary step, as this driver should support in the future similar devices which differ only in the type of interface used (I2C instead of SPI). Signed-off-by: Stefan Popa <stefan.popa@analog.com> Signed-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>
94 lines
2.1 KiB
C
94 lines
2.1 KiB
C
// SPDX-License-Identifier: GPL-2.0+
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/*
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* AD5672R, AD5676, AD5676R, AD5684, AD5684R, AD5684R, AD5685R, AD5686, AD5686R
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* Digital to analog converters driver
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*
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* Copyright 2018 Analog Devices Inc.
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*/
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#include "ad5686.h"
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#include <linux/module.h>
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#include <linux/spi/spi.h>
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static int ad5686_spi_write(struct ad5686_state *st,
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u8 cmd, u8 addr, u16 val)
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{
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struct spi_device *spi = to_spi_device(st->dev);
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st->data[0].d32 = cpu_to_be32(AD5686_CMD(cmd) |
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AD5686_ADDR(addr) |
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val);
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return spi_write(spi, &st->data[0].d8[1], 3);
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}
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static int ad5686_spi_read(struct ad5686_state *st, u8 addr)
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{
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struct spi_transfer t[] = {
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{
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.tx_buf = &st->data[0].d8[1],
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.len = 3,
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.cs_change = 1,
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}, {
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.tx_buf = &st->data[1].d8[1],
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.rx_buf = &st->data[2].d8[1],
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.len = 3,
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},
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};
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struct spi_device *spi = to_spi_device(st->dev);
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int ret;
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st->data[0].d32 = cpu_to_be32(AD5686_CMD(AD5686_CMD_READBACK_ENABLE) |
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AD5686_ADDR(addr));
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st->data[1].d32 = cpu_to_be32(AD5686_CMD(AD5686_CMD_NOOP));
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ret = spi_sync_transfer(spi, t, ARRAY_SIZE(t));
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if (ret < 0)
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return ret;
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return be32_to_cpu(st->data[2].d32);
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}
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static int ad5686_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 ad5686_probe(&spi->dev, id->driver_data, id->name,
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ad5686_spi_write, ad5686_spi_read);
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}
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static int ad5686_spi_remove(struct spi_device *spi)
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{
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return ad5686_remove(&spi->dev);
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}
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static const struct spi_device_id ad5686_spi_id[] = {
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{"ad5672r", ID_AD5672R},
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{"ad5676", ID_AD5676},
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{"ad5676r", ID_AD5676R},
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{"ad5684", ID_AD5684},
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{"ad5684r", ID_AD5684R},
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{"ad5685", ID_AD5685R}, /* Does not exist */
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{"ad5685r", ID_AD5685R},
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{"ad5686", ID_AD5686},
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{"ad5686r", ID_AD5686R},
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{}
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};
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MODULE_DEVICE_TABLE(spi, ad5686_spi_id);
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static struct spi_driver ad5686_spi_driver = {
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.driver = {
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.name = "ad5686",
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},
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.probe = ad5686_spi_probe,
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.remove = ad5686_spi_remove,
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.id_table = ad5686_spi_id,
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};
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module_spi_driver(ad5686_spi_driver);
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MODULE_AUTHOR("Stefan Popa <stefan.popa@analog.com>");
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MODULE_DESCRIPTION("Analog Devices AD5686 and similar multi-channel DACs");
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MODULE_LICENSE("GPL v2");
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