Adding upstream version 5.10.209.upstream/5.10.209upstream

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

1 files changed, 297 insertions, 0 deletions

diff --git a/drivers/iio/adc/ad7091r-base.c b/drivers/iio/adc/ad7091r-base.c
new file mode 100644
index 000000000..811f04448
--- /dev/null
+++ b/drivers/iio/adc/ad7091r-base.c
@@ -0,0 +1,297 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * AD7091RX Analog to Digital converter driver
+ *
+ * Copyright 2014-2019 Analog Devices Inc.
+ */
+
+#include <linux/bitops.h>
+#include <linux/iio/events.h>
+#include <linux/iio/iio.h>
+#include <linux/interrupt.h>
+#include <linux/module.h>
+#include <linux/regmap.h>
+#include <linux/regulator/consumer.h>
+
+#include "ad7091r-base.h"
+
+#define AD7091R_REG_RESULT  0
+#define AD7091R_REG_CHANNEL 1
+#define AD7091R_REG_CONF    2
+#define AD7091R_REG_ALERT   3
+#define AD7091R_REG_CH_LOW_LIMIT(ch) ((ch) * 3 + 4)
+#define AD7091R_REG_CH_HIGH_LIMIT(ch) ((ch) * 3 + 5)
+#define AD7091R_REG_CH_HYSTERESIS(ch) ((ch) * 3 + 6)
+
+/* AD7091R_REG_RESULT */
+#define AD7091R_REG_RESULT_CH_ID(x)	    (((x) >> 13) & 0x3)
+#define AD7091R_REG_RESULT_CONV_RESULT(x)   ((x) & 0xfff)
+
+/* AD7091R_REG_CONF */
+#define AD7091R_REG_CONF_AUTO   BIT(8)
+#define AD7091R_REG_CONF_CMD    BIT(10)
+
+#define AD7091R_REG_CONF_MODE_MASK  \
+	(AD7091R_REG_CONF_AUTO | AD7091R_REG_CONF_CMD)
+
+enum ad7091r_mode {
+	AD7091R_MODE_SAMPLE,
+	AD7091R_MODE_COMMAND,
+	AD7091R_MODE_AUTOCYCLE,
+};
+
+struct ad7091r_state {
+	struct device *dev;
+	struct regmap *map;
+	struct regulator *vref;
+	const struct ad7091r_chip_info *chip_info;
+	enum ad7091r_mode mode;
+	struct mutex lock; /*lock to prevent concurent reads */
+};
+
+static int ad7091r_set_mode(struct ad7091r_state *st, enum ad7091r_mode mode)
+{
+	int ret, conf;
+
+	switch (mode) {
+	case AD7091R_MODE_SAMPLE:
+		conf = 0;
+		break;
+	case AD7091R_MODE_COMMAND:
+		conf = AD7091R_REG_CONF_CMD;
+		break;
+	case AD7091R_MODE_AUTOCYCLE:
+		conf = AD7091R_REG_CONF_AUTO;
+		break;
+	default:
+		return -EINVAL;
+	}
+
+	ret = regmap_update_bits(st->map, AD7091R_REG_CONF,
+				 AD7091R_REG_CONF_MODE_MASK, conf);
+	if (ret)
+		return ret;
+
+	st->mode = mode;
+
+	return 0;
+}
+
+static int ad7091r_set_channel(struct ad7091r_state *st, unsigned int channel)
+{
+	unsigned int dummy;
+	int ret;
+
+	/* AD7091R_REG_CHANNEL specified which channels to be converted */
+	ret = regmap_write(st->map, AD7091R_REG_CHANNEL,
+			BIT(channel) | (BIT(channel) << 8));
+	if (ret)
+		return ret;
+
+	/*
+	 * There is a latency of one conversion before the channel conversion
+	 * sequence is updated
+	 */
+	return regmap_read(st->map, AD7091R_REG_RESULT, &dummy);
+}
+
+static int ad7091r_read_one(struct iio_dev *iio_dev,
+		unsigned int channel, unsigned int *read_val)
+{
+	struct ad7091r_state *st = iio_priv(iio_dev);
+	unsigned int val;
+	int ret;
+
+	ret = ad7091r_set_channel(st, channel);
+	if (ret)
+		return ret;
+
+	ret = regmap_read(st->map, AD7091R_REG_RESULT, &val);
+	if (ret)
+		return ret;
+
+	if (AD7091R_REG_RESULT_CH_ID(val) != channel)
+		return -EIO;
+
+	*read_val = AD7091R_REG_RESULT_CONV_RESULT(val);
+
+	return 0;
+}
+
+static int ad7091r_read_raw(struct iio_dev *iio_dev,
+			   struct iio_chan_spec const *chan,
+			   int *val, int *val2, long m)
+{
+	struct ad7091r_state *st = iio_priv(iio_dev);
+	unsigned int read_val;
+	int ret;
+
+	mutex_lock(&st->lock);
+
+	switch (m) {
+	case IIO_CHAN_INFO_RAW:
+		if (st->mode != AD7091R_MODE_COMMAND) {
+			ret = -EBUSY;
+			goto unlock;
+		}
+
+		ret = ad7091r_read_one(iio_dev, chan->channel, &read_val);
+		if (ret)
+			goto unlock;
+
+		*val = read_val;
+		ret = IIO_VAL_INT;
+		break;
+
+	case IIO_CHAN_INFO_SCALE:
+		if (st->vref) {
+			ret = regulator_get_voltage(st->vref);
+			if (ret < 0)
+				goto unlock;
+
+			*val = ret / 1000;
+		} else {
+			*val = st->chip_info->vref_mV;
+		}
+
+		*val2 = chan->scan_type.realbits;
+		ret = IIO_VAL_FRACTIONAL_LOG2;
+		break;
+
+	default:
+		ret = -EINVAL;
+		break;
+	}
+
+unlock:
+	mutex_unlock(&st->lock);
+	return ret;
+}
+
+static const struct iio_info ad7091r_info = {
+	.read_raw = ad7091r_read_raw,
+};
+
+static irqreturn_t ad7091r_event_handler(int irq, void *private)
+{
+	struct iio_dev *iio_dev = private;
+	struct ad7091r_state *st = iio_priv(iio_dev);
+	unsigned int i, read_val;
+	int ret;
+	s64 timestamp = iio_get_time_ns(iio_dev);
+
+	ret = regmap_read(st->map, AD7091R_REG_ALERT, &read_val);
+	if (ret)
+		return IRQ_HANDLED;
+
+	for (i = 0; i < st->chip_info->num_channels; i++) {
+		if (read_val & BIT(i * 2))
+			iio_push_event(iio_dev,
+					IIO_UNMOD_EVENT_CODE(IIO_VOLTAGE, i,
+						IIO_EV_TYPE_THRESH,
+						IIO_EV_DIR_RISING), timestamp);
+		if (read_val & BIT(i * 2 + 1))
+			iio_push_event(iio_dev,
+					IIO_UNMOD_EVENT_CODE(IIO_VOLTAGE, i,
+						IIO_EV_TYPE_THRESH,
+						IIO_EV_DIR_FALLING), timestamp);
+	}
+
+	return IRQ_HANDLED;
+}
+
+static void ad7091r_remove(void *data)
+{
+	struct ad7091r_state *st = data;
+
+	regulator_disable(st->vref);
+}
+
+int ad7091r_probe(struct device *dev, const char *name,
+		const struct ad7091r_chip_info *chip_info,
+		struct regmap *map, int irq)
+{
+	struct iio_dev *iio_dev;
+	struct ad7091r_state *st;
+	int ret;
+
+	iio_dev = devm_iio_device_alloc(dev, sizeof(*st));
+	if (!iio_dev)
+		return -ENOMEM;
+
+	st = iio_priv(iio_dev);
+	st->dev = dev;
+	st->chip_info = chip_info;
+	st->map = map;
+
+	iio_dev->name = name;
+	iio_dev->info = &ad7091r_info;
+	iio_dev->modes = INDIO_DIRECT_MODE;
+
+	iio_dev->num_channels = chip_info->num_channels;
+	iio_dev->channels = chip_info->channels;
+
+	if (irq) {
+		ret = devm_request_threaded_irq(dev, irq, NULL,
+				ad7091r_event_handler,
+				IRQF_TRIGGER_FALLING | IRQF_ONESHOT, name, iio_dev);
+		if (ret)
+			return ret;
+	}
+
+	st->vref = devm_regulator_get_optional(dev, "vref");
+	if (IS_ERR(st->vref)) {
+		if (PTR_ERR(st->vref) == -EPROBE_DEFER)
+			return -EPROBE_DEFER;
+		st->vref = NULL;
+	} else {
+		ret = regulator_enable(st->vref);
+		if (ret)
+			return ret;
+		ret = devm_add_action_or_reset(dev, ad7091r_remove, st);
+		if (ret)
+			return ret;
+	}
+
+	/* Use command mode by default to convert only desired channels*/
+	ret = ad7091r_set_mode(st, AD7091R_MODE_COMMAND);
+	if (ret)
+		return ret;
+
+	return devm_iio_device_register(dev, iio_dev);
+}
+EXPORT_SYMBOL_GPL(ad7091r_probe);
+
+static bool ad7091r_writeable_reg(struct device *dev, unsigned int reg)
+{
+	switch (reg) {
+	case AD7091R_REG_RESULT:
+	case AD7091R_REG_ALERT:
+		return false;
+	default:
+		return true;
+	}
+}
+
+static bool ad7091r_volatile_reg(struct device *dev, unsigned int reg)
+{
+	switch (reg) {
+	case AD7091R_REG_RESULT:
+	case AD7091R_REG_ALERT:
+		return true;
+	default:
+		return false;
+	}
+}
+
+const struct regmap_config ad7091r_regmap_config = {
+	.reg_bits = 8,
+	.val_bits = 16,
+	.writeable_reg = ad7091r_writeable_reg,
+	.volatile_reg = ad7091r_volatile_reg,
+};
+EXPORT_SYMBOL_GPL(ad7091r_regmap_config);
+
+MODULE_AUTHOR("Beniamin Bia <beniamin.bia@analog.com>");
+MODULE_DESCRIPTION("Analog Devices AD7091Rx multi-channel converters");
+MODULE_LICENSE("GPL v2");