Adding upstream version 4.19.249.upstream/4.19.249upstream

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 172 insertions, 0 deletions

diff --git a/drivers/iio/dac/ad5592r.c b/drivers/iio/dac/ad5592r.c
new file mode 100644
index 000000000..6a12a3c9d
--- /dev/null
+++ b/drivers/iio/dac/ad5592r.c
@@ -0,0 +1,172 @@
+/*
+ * 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>
+#include <linux/acpi.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, __be16 *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 const struct acpi_device_id ad5592r_acpi_match[] = {
+	{"ADS5592", },
+	{ },
+};
+MODULE_DEVICE_TABLE(acpi, ad5592r_acpi_match);
+
+static struct spi_driver ad5592r_spi_driver = {
+	.driver = {
+		.name = "ad5592r",
+		.of_match_table = of_match_ptr(ad5592r_of_match),
+		.acpi_match_table = ACPI_PTR(ad5592r_acpi_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");