![Paul Cercueil](/assets/img/avatar_default.png)
This patch adds support for the AD5592R (spi) and AD5593R (i2c) ADC/DAC/GPIO devices. Signed-off-by: Paul Cercueil <paul.cercueil@analog.com> Signed-off-by: Michael Hennerich <michael.hennerich@analog.com> Reviewed-by: Linus Walleij <linus.walleij@linaro.org> Acked-by: Rob Herring <robh@kernel.org> Signed-off-by: Jonathan Cameron <jic23@kernel.org>
165 lines
3.8 KiB
C
165 lines
3.8 KiB
C
/*
|
|
* AD5592R Digital <-> Analog converters driver
|
|
*
|
|
* Copyright 2015-2016 Analog Devices Inc.
|
|
* Author: Paul Cercueil <paul.cercueil@analog.com>
|
|
*
|
|
* Licensed under the GPL-2.
|
|
*/
|
|
|
|
#include "ad5592r-base.h"
|
|
|
|
#include <linux/bitops.h>
|
|
#include <linux/module.h>
|
|
#include <linux/of.h>
|
|
#include <linux/spi/spi.h>
|
|
|
|
#define AD5592R_GPIO_READBACK_EN BIT(10)
|
|
#define AD5592R_LDAC_READBACK_EN BIT(6)
|
|
|
|
static int ad5592r_spi_wnop_r16(struct ad5592r_state *st, u16 *buf)
|
|
{
|
|
struct spi_device *spi = container_of(st->dev, struct spi_device, dev);
|
|
struct spi_transfer t = {
|
|
.tx_buf = &st->spi_msg_nop,
|
|
.rx_buf = buf,
|
|
.len = 2
|
|
};
|
|
|
|
st->spi_msg_nop = 0; /* NOP */
|
|
|
|
return spi_sync_transfer(spi, &t, 1);
|
|
}
|
|
|
|
static int ad5592r_write_dac(struct ad5592r_state *st, unsigned chan, u16 value)
|
|
{
|
|
struct spi_device *spi = container_of(st->dev, struct spi_device, dev);
|
|
|
|
st->spi_msg = cpu_to_be16(BIT(15) | (chan << 12) | value);
|
|
|
|
return spi_write(spi, &st->spi_msg, sizeof(st->spi_msg));
|
|
}
|
|
|
|
static int ad5592r_read_adc(struct ad5592r_state *st, unsigned chan, u16 *value)
|
|
{
|
|
struct spi_device *spi = container_of(st->dev, struct spi_device, dev);
|
|
int ret;
|
|
|
|
st->spi_msg = cpu_to_be16((AD5592R_REG_ADC_SEQ << 11) | BIT(chan));
|
|
|
|
ret = spi_write(spi, &st->spi_msg, sizeof(st->spi_msg));
|
|
if (ret)
|
|
return ret;
|
|
|
|
/*
|
|
* Invalid data:
|
|
* See Figure 40. Single-Channel ADC Conversion Sequence
|
|
*/
|
|
ret = ad5592r_spi_wnop_r16(st, &st->spi_msg);
|
|
if (ret)
|
|
return ret;
|
|
|
|
ret = ad5592r_spi_wnop_r16(st, &st->spi_msg);
|
|
if (ret)
|
|
return ret;
|
|
|
|
*value = be16_to_cpu(st->spi_msg);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int ad5592r_reg_write(struct ad5592r_state *st, u8 reg, u16 value)
|
|
{
|
|
struct spi_device *spi = container_of(st->dev, struct spi_device, dev);
|
|
|
|
st->spi_msg = cpu_to_be16((reg << 11) | value);
|
|
|
|
return spi_write(spi, &st->spi_msg, sizeof(st->spi_msg));
|
|
}
|
|
|
|
static int ad5592r_reg_read(struct ad5592r_state *st, u8 reg, u16 *value)
|
|
{
|
|
struct spi_device *spi = container_of(st->dev, struct spi_device, dev);
|
|
int ret;
|
|
|
|
st->spi_msg = cpu_to_be16((AD5592R_REG_LDAC << 11) |
|
|
AD5592R_LDAC_READBACK_EN | (reg << 2));
|
|
|
|
ret = spi_write(spi, &st->spi_msg, sizeof(st->spi_msg));
|
|
if (ret)
|
|
return ret;
|
|
|
|
ret = ad5592r_spi_wnop_r16(st, &st->spi_msg);
|
|
if (ret)
|
|
return ret;
|
|
|
|
*value = be16_to_cpu(st->spi_msg);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int ad5593r_gpio_read(struct ad5592r_state *st, u8 *value)
|
|
{
|
|
int ret;
|
|
|
|
ret = ad5592r_reg_write(st, AD5592R_REG_GPIO_IN_EN,
|
|
AD5592R_GPIO_READBACK_EN | st->gpio_in);
|
|
if (ret)
|
|
return ret;
|
|
|
|
ret = ad5592r_spi_wnop_r16(st, &st->spi_msg);
|
|
if (ret)
|
|
return ret;
|
|
|
|
*value = (u8) be16_to_cpu(st->spi_msg);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static const struct ad5592r_rw_ops ad5592r_rw_ops = {
|
|
.write_dac = ad5592r_write_dac,
|
|
.read_adc = ad5592r_read_adc,
|
|
.reg_write = ad5592r_reg_write,
|
|
.reg_read = ad5592r_reg_read,
|
|
.gpio_read = ad5593r_gpio_read,
|
|
};
|
|
|
|
static int ad5592r_spi_probe(struct spi_device *spi)
|
|
{
|
|
const struct spi_device_id *id = spi_get_device_id(spi);
|
|
|
|
return ad5592r_probe(&spi->dev, id->name, &ad5592r_rw_ops);
|
|
}
|
|
|
|
static int ad5592r_spi_remove(struct spi_device *spi)
|
|
{
|
|
return ad5592r_remove(&spi->dev);
|
|
}
|
|
|
|
static const struct spi_device_id ad5592r_spi_ids[] = {
|
|
{ .name = "ad5592r", },
|
|
{}
|
|
};
|
|
MODULE_DEVICE_TABLE(spi, ad5592r_spi_ids);
|
|
|
|
static const struct of_device_id ad5592r_of_match[] = {
|
|
{ .compatible = "adi,ad5592r", },
|
|
{},
|
|
};
|
|
MODULE_DEVICE_TABLE(of, ad5592r_of_match);
|
|
|
|
static struct spi_driver ad5592r_spi_driver = {
|
|
.driver = {
|
|
.name = "ad5592r",
|
|
.of_match_table = of_match_ptr(ad5592r_of_match),
|
|
},
|
|
.probe = ad5592r_spi_probe,
|
|
.remove = ad5592r_spi_remove,
|
|
.id_table = ad5592r_spi_ids,
|
|
};
|
|
module_spi_driver(ad5592r_spi_driver);
|
|
|
|
MODULE_AUTHOR("Paul Cercueil <paul.cercueil@analog.com>");
|
|
MODULE_DESCRIPTION("Analog Devices AD5592R multi-channel converters");
|
|
MODULE_LICENSE("GPL v2");
|