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The AD5681R/AD5682R/AD5683/AD5683R are a family of one channel DACs with 12-bit, 14-bit and 16-bit precision respectively. The devices have either no built-in reference, or built-in 2.5V reference. These devices are similar to AD5691R/AD5692R/AD5693/AD5693R except with a few notable differences: * they use the SPI interface instead of I2C * in the write control register, DB18 and DB17 are used for setting the power mode, while DB16 is the REF bit. This is why a new regmap type was defined and checked accordingly. * the shift register is 24 bits wide, the first four bits are the command bits followed by the data bits. As the data comprises of 20-bit, 18-bit or 16-bit input code, this means that 4 LSB bits are don't care. This is why the data needs to be shifted on the left with four bits. Therefore, AD5683_REGMAP is checked inside a switch case in the ad5686_spi_write() function. On the other hand, similar devices such as AD5693R family, have the 4 MSB command bits followed by 4 don't care bits. Datasheet: http://www.analog.com/media/en/technical-documentation/data-sheets/AD5683R_5682R_5681R_5683.pdf Signed-off-by: Stefan Popa <stefan.popa@analog.com> Signed-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>
120 lines
2.7 KiB
C
120 lines
2.7 KiB
C
// SPDX-License-Identifier: GPL-2.0+
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/*
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* AD5672R, AD5676, AD5676R, AD5681R, AD5682R, AD5683, AD5683R,
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* AD5684, 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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u8 tx_len, *buf;
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switch (st->chip_info->regmap_type) {
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case AD5683_REGMAP:
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st->data[0].d32 = cpu_to_be32(AD5686_CMD(cmd) |
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AD5683_DATA(val));
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buf = &st->data[0].d8[1];
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tx_len = 3;
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break;
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case AD5686_REGMAP:
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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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buf = &st->data[0].d8[1];
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tx_len = 3;
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break;
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default:
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return -EINVAL;
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}
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return spi_write(spi, buf, tx_len);
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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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u8 cmd = 0;
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int ret;
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if (st->chip_info->regmap_type == AD5686_REGMAP)
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cmd = AD5686_CMD_READBACK_ENABLE;
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else if (st->chip_info->regmap_type == AD5683_REGMAP)
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cmd = AD5686_CMD_READBACK_ENABLE_V2;
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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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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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{"ad5681r", ID_AD5681R},
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{"ad5682r", ID_AD5682R},
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{"ad5683", ID_AD5683},
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{"ad5683r", ID_AD5683R},
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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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