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author | Daniel Baumann <daniel.baumann@progress-linux.org> | 2024-05-06 01:02:30 +0000 |
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committer | Daniel Baumann <daniel.baumann@progress-linux.org> | 2024-05-06 01:02:30 +0000 |
commit | 76cb841cb886eef6b3bee341a2266c76578724ad (patch) | |
tree | f5892e5ba6cc11949952a6ce4ecbe6d516d6ce58 /drivers/iio/dac/ad5686-spi.c | |
parent | Initial commit. (diff) | |
download | linux-76cb841cb886eef6b3bee341a2266c76578724ad.tar.xz linux-76cb841cb886eef6b3bee341a2266c76578724ad.zip |
Adding upstream version 4.19.249.upstream/4.19.249upstream
Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
Diffstat (limited to 'drivers/iio/dac/ad5686-spi.c')
-rw-r--r-- | drivers/iio/dac/ad5686-spi.c | 119 |
1 files changed, 119 insertions, 0 deletions
diff --git a/drivers/iio/dac/ad5686-spi.c b/drivers/iio/dac/ad5686-spi.c new file mode 100644 index 000000000..1df9143f5 --- /dev/null +++ b/drivers/iio/dac/ad5686-spi.c @@ -0,0 +1,119 @@ +// SPDX-License-Identifier: GPL-2.0+ +/* + * AD5672R, AD5676, AD5676R, AD5681R, AD5682R, AD5683, AD5683R, + * AD5684, AD5684R, AD5685R, AD5686, AD5686R + * Digital to analog converters driver + * + * Copyright 2018 Analog Devices Inc. + */ + +#include "ad5686.h" + +#include <linux/module.h> +#include <linux/spi/spi.h> + +static int ad5686_spi_write(struct ad5686_state *st, + u8 cmd, u8 addr, u16 val) +{ + struct spi_device *spi = to_spi_device(st->dev); + u8 tx_len, *buf; + + switch (st->chip_info->regmap_type) { + case AD5683_REGMAP: + st->data[0].d32 = cpu_to_be32(AD5686_CMD(cmd) | + AD5683_DATA(val)); + buf = &st->data[0].d8[1]; + tx_len = 3; + break; + case AD5686_REGMAP: + st->data[0].d32 = cpu_to_be32(AD5686_CMD(cmd) | + AD5686_ADDR(addr) | + val); + buf = &st->data[0].d8[1]; + tx_len = 3; + break; + default: + return -EINVAL; + } + + return spi_write(spi, buf, tx_len); +} + +static int ad5686_spi_read(struct ad5686_state *st, u8 addr) +{ + struct spi_transfer t[] = { + { + .tx_buf = &st->data[0].d8[1], + .len = 3, + .cs_change = 1, + }, { + .tx_buf = &st->data[1].d8[1], + .rx_buf = &st->data[2].d8[1], + .len = 3, + }, + }; + struct spi_device *spi = to_spi_device(st->dev); + u8 cmd = 0; + int ret; + + if (st->chip_info->regmap_type == AD5686_REGMAP) + cmd = AD5686_CMD_READBACK_ENABLE; + else if (st->chip_info->regmap_type == AD5683_REGMAP) + cmd = AD5686_CMD_READBACK_ENABLE_V2; + + st->data[0].d32 = cpu_to_be32(AD5686_CMD(cmd) | + AD5686_ADDR(addr)); + st->data[1].d32 = cpu_to_be32(AD5686_CMD(AD5686_CMD_NOOP)); + + ret = spi_sync_transfer(spi, t, ARRAY_SIZE(t)); + if (ret < 0) + return ret; + + return be32_to_cpu(st->data[2].d32); +} + +static int ad5686_spi_probe(struct spi_device *spi) +{ + const struct spi_device_id *id = spi_get_device_id(spi); + + return ad5686_probe(&spi->dev, id->driver_data, id->name, + ad5686_spi_write, ad5686_spi_read); +} + +static int ad5686_spi_remove(struct spi_device *spi) +{ + return ad5686_remove(&spi->dev); +} + +static const struct spi_device_id ad5686_spi_id[] = { + {"ad5672r", ID_AD5672R}, + {"ad5676", ID_AD5676}, + {"ad5676r", ID_AD5676R}, + {"ad5681r", ID_AD5681R}, + {"ad5682r", ID_AD5682R}, + {"ad5683", ID_AD5683}, + {"ad5683r", ID_AD5683R}, + {"ad5684", ID_AD5684}, + {"ad5684r", ID_AD5684R}, + {"ad5685", ID_AD5685R}, /* Does not exist */ + {"ad5685r", ID_AD5685R}, + {"ad5686", ID_AD5686}, + {"ad5686r", ID_AD5686R}, + {} +}; +MODULE_DEVICE_TABLE(spi, ad5686_spi_id); + +static struct spi_driver ad5686_spi_driver = { + .driver = { + .name = "ad5686", + }, + .probe = ad5686_spi_probe, + .remove = ad5686_spi_remove, + .id_table = ad5686_spi_id, +}; + +module_spi_driver(ad5686_spi_driver); + +MODULE_AUTHOR("Stefan Popa <stefan.popa@analog.com>"); +MODULE_DESCRIPTION("Analog Devices AD5686 and similar multi-channel DACs"); +MODULE_LICENSE("GPL v2"); |