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// SPDX-License-Identifier: GPL-2.0
/*
* SPI driver for AD5686 and similar Digital to Analog Converters
*
* Copyright 2018 Analog Devices Inc.
*/
#include <linux/array_size.h>
#include <linux/bitfield.h>
#include <linux/errno.h>
#include <linux/module.h>
#include <linux/overflow.h>
#include <linux/spi/spi.h>
#include <asm/byteorder.h>
#include "ad5686.h"
/**
* struct ad5686_spi_data - SPI bus specific data
* @msg: SPI message used for transfers
* @size: number of transfers currently in the message
* @capacity: maximum number of transfers that can be added to the message
* @xfers: array of SPI transfers, allocated with the provided capacity
*/
struct ad5686_spi_data {
struct spi_message msg;
unsigned int size;
unsigned int capacity;
struct spi_transfer xfers[] __counted_by(capacity);
};
static int ad5686_spi_write(struct ad5686_state *st,
u8 cmd, u8 addr, u16 val)
{
struct ad5686_spi_data *bus_data = st->bus_data;
struct spi_transfer *xfer;
if (bus_data->size >= bus_data->capacity)
return -E2BIG;
/*
* This function stores spi transfers to a spi message to be sent over
* the bus when sync() op is called. If there are already transfers in
* the spi message, set the cs_change flag on the last transfer to
* ensure that the chip select is deasserted between transfers. If this
* is the first transfer, initialize the spi message. Later on, the
* current transfer is added to the message with spi_message_add_tail().
*/
if (bus_data->size)
bus_data->xfers[bus_data->size - 1].cs_change = 1;
else
spi_message_init(&bus_data->msg);
xfer = &bus_data->xfers[bus_data->size];
auto buf = &st->data[bus_data->size];
switch (st->chip_info->regmap_type) {
case AD5310_REGMAP:
buf->d16 = cpu_to_be16(FIELD_PREP(AD5310_CMD_MSK, cmd) |
FIELD_PREP(AD5310_DATA_MSK, val));
*xfer = (struct spi_transfer) {
.tx_buf = &buf->d16,
.len = sizeof(buf->d16),
};
break;
case AD5683_REGMAP:
buf->d32 = cpu_to_be32(FIELD_PREP(AD5686_CMD_MSK, cmd) |
FIELD_PREP(AD5683_DATA_MSK, val));
*xfer = (struct spi_transfer) {
.tx_buf = &buf->d8[1],
.len = sizeof(buf->d8) - 1,
};
break;
case AD5686_REGMAP:
buf->d32 = cpu_to_be32(FIELD_PREP(AD5686_CMD_MSK, cmd) |
FIELD_PREP(AD5686_ADDR_MSK, addr) |
FIELD_PREP(AD5686_DATA_MSK, val));
*xfer = (struct spi_transfer) {
.tx_buf = &buf->d8[1],
.len = sizeof(buf->d8) - 1,
};
break;
default:
return -EINVAL;
}
spi_message_add_tail(xfer, &bus_data->msg);
bus_data->size++;
return 0;
}
static int ad5686_spi_sync(struct ad5686_state *st)
{
struct spi_device *spi = to_spi_device(st->dev);
struct ad5686_spi_data *bus_data = st->bus_data;
bus_data->size = 0; /* always reset, even on sync failure */
return spi_sync(spi, &bus_data->msg);
}
static int ad5686_spi_read(struct ad5686_state *st, u8 addr)
{
struct spi_device *spi = to_spi_device(st->dev);
struct ad5686_spi_data *bus_data = st->bus_data;
struct spi_transfer *xfer = &bus_data->xfers[0];
u8 cmd = 0;
int ret;
switch (st->chip_info->regmap_type) {
case AD5310_REGMAP:
return -ENOTSUPP;
case AD5683_REGMAP:
cmd = AD5686_CMD_READBACK_ENABLE_V2;
break;
case AD5686_REGMAP:
cmd = AD5686_CMD_READBACK_ENABLE;
break;
default:
return -EINVAL;
}
st->data[0].d32 = cpu_to_be32(FIELD_PREP(AD5686_CMD_MSK, cmd) |
FIELD_PREP(AD5686_ADDR_MSK, addr));
st->data[1].d32 = cpu_to_be32(FIELD_PREP(AD5686_CMD_MSK, AD5686_CMD_NOOP));
xfer[0] = (struct spi_transfer) {
.tx_buf = &st->data[0].d8[1],
.len = sizeof(st->data[0].d8) - 1,
.cs_change = 1,
};
xfer[1] = (struct spi_transfer) {
.tx_buf = &st->data[1].d8[1],
.rx_buf = &st->data[2].d8[1],
.len = sizeof(st->data[1].d8) - 1,
};
spi_message_init_with_transfers(&bus_data->msg, xfer, 2);
ret = spi_sync(spi, &bus_data->msg);
if (ret)
return ret;
return be32_to_cpu(st->data[2].d32);
}
static const struct ad5686_bus_ops ad5686_spi_ops = {
.write = ad5686_spi_write,
.read = ad5686_spi_read,
.sync = ad5686_spi_sync,
};
static int ad5686_spi_probe(struct spi_device *spi)
{
const struct ad5686_chip_info *info;
struct ad5686_spi_data *bus_data;
struct device *dev = &spi->dev;
unsigned int capacity;
info = spi_get_device_match_data(spi);
if (!info)
return -ENODATA;
/* read operation requires at least 2 transfers */
capacity = max(info->num_channels, 2);
bus_data = devm_kzalloc(dev, struct_size(bus_data, xfers, capacity),
GFP_KERNEL);
if (!bus_data)
return -ENOMEM;
bus_data->capacity = capacity;
return ad5686_probe(dev, info, spi->modalias, &ad5686_spi_ops, bus_data);
}
static const struct spi_device_id ad5686_spi_id[] = {
{ .name = "ad5310r", .driver_data = (kernel_ulong_t)&ad5310r_chip_info },
{ .name = "ad5313r", .driver_data = (kernel_ulong_t)&ad5338r_chip_info },
{ .name = "ad5317r", .driver_data = (kernel_ulong_t)&ad5317r_chip_info },
{ .name = "ad5672r", .driver_data = (kernel_ulong_t)&ad5672r_chip_info },
{ .name = "ad5674", .driver_data = (kernel_ulong_t)&ad5674_chip_info },
{ .name = "ad5674r", .driver_data = (kernel_ulong_t)&ad5674r_chip_info },
{ .name = "ad5676", .driver_data = (kernel_ulong_t)&ad5676_chip_info },
{ .name = "ad5676r", .driver_data = (kernel_ulong_t)&ad5676r_chip_info },
{ .name = "ad5679", .driver_data = (kernel_ulong_t)&ad5679_chip_info },
{ .name = "ad5679r", .driver_data = (kernel_ulong_t)&ad5679r_chip_info },
{ .name = "ad5681r", .driver_data = (kernel_ulong_t)&ad5681r_chip_info },
{ .name = "ad5682r", .driver_data = (kernel_ulong_t)&ad5682r_chip_info },
{ .name = "ad5683", .driver_data = (kernel_ulong_t)&ad5683_chip_info },
{ .name = "ad5683r", .driver_data = (kernel_ulong_t)&ad5683r_chip_info },
{ .name = "ad5684", .driver_data = (kernel_ulong_t)&ad5684_chip_info },
{ .name = "ad5684r", .driver_data = (kernel_ulong_t)&ad5684r_chip_info },
{ .name = "ad5685", .driver_data = (kernel_ulong_t)&ad5685r_chip_info }, /* nonexistent */
{ .name = "ad5685r", .driver_data = (kernel_ulong_t)&ad5685r_chip_info },
{ .name = "ad5686", .driver_data = (kernel_ulong_t)&ad5686_chip_info },
{ .name = "ad5686r", .driver_data = (kernel_ulong_t)&ad5686r_chip_info },
{ .name = "ad5687", .driver_data = (kernel_ulong_t)&ad5687_chip_info },
{ .name = "ad5687r", .driver_data = (kernel_ulong_t)&ad5687r_chip_info },
{ .name = "ad5689", .driver_data = (kernel_ulong_t)&ad5689_chip_info },
{ .name = "ad5689r", .driver_data = (kernel_ulong_t)&ad5689r_chip_info },
{ }
};
MODULE_DEVICE_TABLE(spi, ad5686_spi_id);
static const struct of_device_id ad5686_of_match[] = {
{ .compatible = "adi,ad5310r", .data = &ad5310r_chip_info },
{ .compatible = "adi,ad5313r", .data = &ad5338r_chip_info },
{ .compatible = "adi,ad5317r", .data = &ad5317r_chip_info },
{ .compatible = "adi,ad5672r", .data = &ad5672r_chip_info },
{ .compatible = "adi,ad5674", .data = &ad5674_chip_info },
{ .compatible = "adi,ad5674r", .data = &ad5674r_chip_info },
{ .compatible = "adi,ad5676", .data = &ad5676_chip_info },
{ .compatible = "adi,ad5676r", .data = &ad5676r_chip_info },
{ .compatible = "adi,ad5679", .data = &ad5679_chip_info },
{ .compatible = "adi,ad5679r", .data = &ad5679r_chip_info },
{ .compatible = "adi,ad5681r", .data = &ad5681r_chip_info },
{ .compatible = "adi,ad5682r", .data = &ad5682r_chip_info },
{ .compatible = "adi,ad5683", .data = &ad5683_chip_info },
{ .compatible = "adi,ad5683r", .data = &ad5683r_chip_info },
{ .compatible = "adi,ad5684", .data = &ad5684_chip_info },
{ .compatible = "adi,ad5684r", .data = &ad5684r_chip_info },
{ .compatible = "adi,ad5685r", .data = &ad5685r_chip_info },
{ .compatible = "adi,ad5686", .data = &ad5686_chip_info },
{ .compatible = "adi,ad5686r", .data = &ad5686r_chip_info },
{ .compatible = "adi,ad5687", .data = &ad5687_chip_info },
{ .compatible = "adi,ad5687r", .data = &ad5687r_chip_info },
{ .compatible = "adi,ad5689", .data = &ad5689_chip_info },
{ .compatible = "adi,ad5689r", .data = &ad5689r_chip_info },
{ }
};
MODULE_DEVICE_TABLE(of, ad5686_of_match);
static struct spi_driver ad5686_spi_driver = {
.driver = {
.name = "ad5686",
.of_match_table = ad5686_of_match,
},
.probe = ad5686_spi_probe,
.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");
MODULE_IMPORT_NS("IIO_AD5686");
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