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Date:   Sat, 11 Nov 2023 17:05:02 -0500
From:   Abdel Alkuor <alkuor@...il.com>
To:     Jonathan Cameron <jic23@...nel.org>,
        Lars-Peter Clausen <lars@...afoo.de>
Cc:     Abdel Alkuor <alkuor@...il.com>, linux-kernel@...r.kernel.org,
        linux-iio@...r.kernel.org
Subject: [PATCH 2/2] iio: temperature: Add support for AMS AS6200

as6200 is a high accuracy temperature sensor of 0.0625C with a range
between -40 to 125 Celsius degrees. The driver implements the alert
trigger event in comparator mode where an alert would trigger
when n number of consecutive current temperature is above the upper
temp limit, and the alert is only cleared when the n number of
consecutive current temperature is below the lower temp limit.

The driver supports the following:
- show available sampling frequencey
- read/write sampling frequency
- read raw temperature
- read scaling factor
- read/write consective faults to trigger/clear an alert
- show available consecutive faults
- buffer trigger
- temperature alert event trigger

https://ams.com/documents/20143/36005/AS6200_DS000449_4-00.pdf

Signed-off-by: Abdel Alkuor <alkuor@...il.com>
---
 drivers/iio/temperature/Kconfig  |   9 +
 drivers/iio/temperature/Makefile |   1 +
 drivers/iio/temperature/as6200.c | 507 +++++++++++++++++++++++++++++++
 3 files changed, 517 insertions(+)
 create mode 100644 drivers/iio/temperature/as6200.c

diff --git a/drivers/iio/temperature/Kconfig b/drivers/iio/temperature/Kconfig
index ed384f33e0c7..f32691744952 100644
--- a/drivers/iio/temperature/Kconfig
+++ b/drivers/iio/temperature/Kconfig
@@ -157,5 +157,14 @@ config MAX31865
 
 	  This driver can also be build as a module. If so, the module
 	  will be called max31865.
+config AS6200
+       tristate "AS6200 temperature sensor"
+       depends on I2C
+       help
+         If you say yes here you get support for AS6200
+         temperature sensor chip connected via I2C.
+
+         This driver can also be built as a module.  If so, the module
+         will be called as6200.
 
 endmenu
diff --git a/drivers/iio/temperature/Makefile b/drivers/iio/temperature/Makefile
index dfec8c6d3019..48f647c273c1 100644
--- a/drivers/iio/temperature/Makefile
+++ b/drivers/iio/temperature/Makefile
@@ -17,3 +17,4 @@ obj-$(CONFIG_TMP007) += tmp007.o
 obj-$(CONFIG_TMP117) += tmp117.o
 obj-$(CONFIG_TSYS01) += tsys01.o
 obj-$(CONFIG_TSYS02D) += tsys02d.o
+obj-$(CONFIG_AS6200) += as6200.o
diff --git a/drivers/iio/temperature/as6200.c b/drivers/iio/temperature/as6200.c
new file mode 100644
index 000000000000..a18c5be0a229
--- /dev/null
+++ b/drivers/iio/temperature/as6200.c
@@ -0,0 +1,507 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * Driver for AMS AS6200 Temperature sensor
+ *
+ * Auther: Abdel Alkuor <alkuor@...il.com>
+ */
+
+#include <linux/i2c.h>
+#include <linux/module.h>
+#include <linux/regmap.h>
+#include <linux/interrupt.h>
+#include <linux/iio/iio.h>
+#include <linux/iio/events.h>
+#include <linux/iio/trigger.h>
+#include <linux/iio/buffer.h>
+#include <linux/iio/triggered_buffer.h>
+#include <linux/iio/trigger_consumer.h>
+#include <linux/iio/sysfs.h>
+#include <linux/device.h>
+#include <linux/bitfield.h>
+#include <linux/kstrtox.h>
+
+#define AS_TVAL_REG	0x0
+#define AS_CONFIG_REG	0x1
+#define AS_TLOW_REG	0x2
+#define AS_THIGH_REG	0x3
+
+/* AS_CONFIG_REG */
+#define AS_CONFIG_AL	BIT(5)
+#define AS_CONFIG_CR	GENMASK(7, 6)
+#define AS_CONFIG_SM	BIT(8)
+#define AS_CONFIG_IM	BIT(9)
+#define AS_CONFIG_POL	BIT(10)
+#define AS_CONFIG_CF	GENMASK(12, 11)
+
+#define AS_TEMP_SCALE		62500
+
+struct as6200_freq {
+	int val;
+	int val2;
+};
+
+struct as6200 {
+	struct device *dev;
+	struct regmap *regmap;
+	struct mutex lock;
+	struct iio_dev *indio_dev;
+
+	unsigned int data[3];
+};
+
+static const struct as6200_freq as6200_samp_freq[4] = {
+	{0, 250000},
+	{1, 0},
+	{4, 0},
+	{8, 0},
+};
+
+static const struct iio_event_spec as6200_temp_event[] = {
+	{
+		.type = IIO_EV_TYPE_THRESH,
+		.dir = IIO_EV_DIR_RISING,
+		.mask_separate = BIT(IIO_EV_INFO_VALUE)
+	},
+	{
+		.type = IIO_EV_TYPE_THRESH,
+		.dir = IIO_EV_DIR_FALLING,
+		.mask_separate = BIT(IIO_EV_INFO_VALUE)
+	},
+};
+
+static const struct iio_chan_spec as6200_temp_channels[] = {
+	{
+		.type = IIO_TEMP,
+		.indexed = 0,
+		.info_mask_separate = BIT(IIO_CHAN_INFO_RAW) |
+				      BIT(IIO_CHAN_INFO_SCALE) |
+				      BIT(IIO_CHAN_INFO_SAMP_FREQ),
+		.scan_index = 0,
+		.scan_type = {
+			.sign = 's',
+			.realbits = 12,
+			.storagebits = 16,
+			.shift = 4,
+		},
+		.event_spec = as6200_temp_event,
+		.num_event_specs = ARRAY_SIZE(as6200_temp_event),
+	},
+	IIO_CHAN_SOFT_TIMESTAMP(1),
+};
+
+static const struct regmap_config as6200_regmap_config = {
+	.reg_bits = 8,
+	.val_bits = 16,
+	.max_register = 0x7F,
+};
+
+static int
+as6200_modify_config_reg(struct as6200 *as, unsigned int mask, unsigned int val)
+{
+	int ret;
+	unsigned int reg;
+
+	ret = regmap_read(as->regmap, AS_CONFIG_REG, &reg);
+	if (ret)
+		return ret;
+
+	reg &= ~mask;
+	reg |= val << (ffs(mask) - 1);
+
+	return regmap_write(as->regmap, AS_CONFIG_REG, reg);
+}
+
+static int
+as6200_read_config_reg(struct as6200 *as, unsigned int mask, unsigned int *val)
+{
+	int ret;
+	unsigned int reg;
+
+	ret = regmap_read(as->regmap, AS_CONFIG_REG, &reg);
+	if (ret)
+		return ret;
+
+	*val = (reg & mask) >> (ffs(mask) - 1);
+
+	return 0;
+}
+
+static int as6200_read_raw(struct iio_dev *indio_dev,
+			   struct iio_chan_spec const *chan,
+			   int *val,
+			   int *val2,
+			   long mask)
+{
+	struct as6200 *as = iio_device_get_drvdata(indio_dev);
+	unsigned int reg;
+	int ret;
+
+	switch (mask) {
+	case IIO_CHAN_INFO_RAW:
+		ret = regmap_read(as->regmap, AS_TVAL_REG, &reg);
+		if (ret)
+			return ret;
+
+		*val = sign_extend32(reg >> 4, 11);
+		return IIO_VAL_INT;
+	case IIO_CHAN_INFO_SCALE:
+		*val = 0;
+		*val2 = AS_TEMP_SCALE;
+		return IIO_VAL_INT_PLUS_MICRO;
+	case IIO_CHAN_INFO_SAMP_FREQ:
+		ret = as6200_read_config_reg(as, AS_CONFIG_CR, &reg);
+		if (ret)
+			return ret;
+
+		*val = as6200_samp_freq[reg].val;
+		*val2 = as6200_samp_freq[reg].val2;
+		return IIO_VAL_INT_PLUS_MICRO;
+	default:
+		return -EINVAL;
+	}
+}
+
+static int as6200_write_raw(struct iio_dev *indio_dev,
+			    struct iio_chan_spec const *chan,
+			    int val,
+			    int val2,
+			    long mask)
+{
+	struct as6200 *as = iio_device_get_drvdata(indio_dev);
+	int i;
+
+	switch (mask) {
+	case IIO_CHAN_INFO_SAMP_FREQ:
+		for (i = 0; i < ARRAY_SIZE(as6200_samp_freq); i++) {
+			if (val == as6200_samp_freq[i].val &&
+			    val2 == as6200_samp_freq[i].val2)
+				break;
+		}
+
+		if (i == ARRAY_SIZE(as6200_samp_freq))
+			return -EINVAL;
+
+		return as6200_modify_config_reg(as, AS_CONFIG_CR, i);
+	default:
+		return -EINVAL;
+	}
+}
+
+static int as6200_read_event_value(struct iio_dev *indio_dev,
+			 const struct iio_chan_spec *chan,
+			 enum iio_event_type type,
+			 enum iio_event_direction dir,
+			 enum iio_event_info info,
+			 int *val, int *val2)
+{
+	struct as6200 *as = iio_device_get_drvdata(indio_dev);
+	unsigned int reg;
+	int ret;
+	unsigned int temp;
+
+	switch (dir) {
+	case IIO_EV_DIR_FALLING:
+		reg = AS_TLOW_REG;
+		break;
+	case IIO_EV_DIR_RISING:
+		reg = AS_THIGH_REG;
+		break;
+	default:
+		return -EINVAL;
+	}
+
+	ret = regmap_read(as->regmap, reg, &temp);
+	if (ret)
+		return ret;
+
+	*val = sign_extend32(temp >> 4, 11);
+
+	return IIO_VAL_INT;
+}
+
+static int as6200_write_event_value(struct iio_dev *indio_dev,
+			  const struct iio_chan_spec *chan,
+			  enum iio_event_type type,
+			  enum iio_event_direction dir,
+			  enum iio_event_info info,
+			  int val, int val2)
+{
+	struct as6200 *as = iio_device_get_drvdata(indio_dev);
+	unsigned int temp;
+	unsigned int reg;
+
+	/*
+	 * range without applying the scaling
+	 * factor of 0.06250
+	 */
+	if (val > 2000 || val < -640)
+		return -EINVAL;
+
+	temp = (val & 0xfff) << 4;
+
+	switch (dir) {
+	case IIO_EV_DIR_FALLING:
+		reg = AS_TLOW_REG;
+		break;
+	case IIO_EV_DIR_RISING:
+		reg = AS_THIGH_REG;
+		break;
+	default:
+		return -EINVAL;
+	}
+
+	return regmap_write(as->regmap, reg, temp);
+}
+
+static irqreturn_t as6200_event_handler(int irq, void *private)
+{
+	struct iio_dev *indio_dev = private;
+	struct as6200 *as = iio_device_get_drvdata(indio_dev);
+	unsigned int alert;
+	enum iio_event_direction dir;
+	int ret;
+
+	mutex_lock(&as->lock);
+
+	ret = as6200_read_config_reg(as, AS_CONFIG_AL, &alert);
+	if (ret) {
+		mutex_unlock(&as->lock);
+		return IRQ_NONE;
+	}
+
+	dir = alert ? IIO_EV_DIR_FALLING : IIO_EV_DIR_RISING;
+
+	iio_push_event(indio_dev,
+		       IIO_EVENT_CODE(IIO_TEMP, 0, 0,
+				      dir,
+				      IIO_EV_TYPE_THRESH,
+				      0, 0, 0),
+		       iio_get_time_ns(indio_dev));
+
+	mutex_unlock(&as->lock);
+
+	return IRQ_HANDLED;
+}
+
+static irqreturn_t as6200_trigger_handler(int irq, void *private)
+{
+	struct iio_poll_func *pf = private;
+	struct iio_dev *indio_dev = pf->indio_dev;
+	struct as6200 *as = iio_device_get_drvdata(indio_dev);
+	int ret;
+
+	mutex_lock(&as->lock);
+
+	ret = regmap_read(as->regmap, AS_TVAL_REG, &as->data[0]);
+	if (!ret)
+		iio_push_to_buffers_with_timestamp(indio_dev, as->data,
+						   iio_get_time_ns(indio_dev));
+
+	mutex_unlock(&as->lock);
+
+	iio_trigger_notify_done(indio_dev->trig);
+
+	return IRQ_HANDLED;
+}
+
+static ssize_t
+consecutive_faults_show(struct device *dev,
+			struct device_attribute *attr,
+			char *buf)
+{
+	struct iio_dev *indio_dev = dev_to_iio_dev(dev);
+	struct as6200 *as = iio_device_get_drvdata(indio_dev);
+	unsigned int cf;
+	int ret;
+
+	ret = as6200_read_config_reg(as, AS_CONFIG_CF, &cf);
+	if (ret)
+		return ret;
+
+	return sprintf(buf, "%u\n", cf ? cf * 2 : 1);
+}
+
+static ssize_t
+consecutive_faults_store(struct device *dev,
+			 struct device_attribute *attr,
+			 const char *buf, size_t count)
+{
+	struct iio_dev *indio_dev = dev_to_iio_dev(dev);
+	struct as6200 *as = iio_device_get_drvdata(indio_dev);
+	unsigned int cf;
+	int ret;
+
+	ret = kstrtouint(buf, 0, &cf);
+	if (ret)
+		return ret;
+
+	switch (cf) {
+	case 1:
+		cf = 0;
+		break;
+	case 2:
+	case 4:
+	case 6:
+		cf /= 2;
+		break;
+	default:
+		return -EINVAL;
+	}
+
+	ret = as6200_modify_config_reg(as, AS_CONFIG_CF, cf);
+	if (ret)
+		return ret;
+
+	return count;
+}
+
+static IIO_CONST_ATTR_SAMP_FREQ_AVAIL("0.25 1 4 8");
+static IIO_CONST_ATTR(avail_consecutive_faults, "1 2 4 6");
+static IIO_DEVICE_ATTR_RW(consecutive_faults, 0);
+
+static struct attribute *as6200_event_attributes[] = {
+	&iio_const_attr_avail_consecutive_faults.dev_attr.attr,
+	&iio_dev_attr_consecutive_faults.dev_attr.attr,
+	NULL,
+};
+
+static struct attribute *as6200_attributes[] = {
+	&iio_const_attr_sampling_frequency_available.dev_attr.attr,
+	NULL,
+};
+
+static const struct attribute_group as6200_attribute_group = {
+	.attrs = as6200_attributes,
+};
+
+static const struct attribute_group as6200_event_attribute_group = {
+	.attrs = as6200_event_attributes,
+};
+
+static const struct iio_info as6200_temp_info = {
+	.event_attrs = &as6200_event_attribute_group,
+	.attrs = &as6200_attribute_group,
+	.read_raw = &as6200_read_raw,
+	.write_raw = &as6200_write_raw,
+	.read_event_value = &as6200_read_event_value,
+	.write_event_value = &as6200_write_event_value,
+};
+
+static int as6200_probe(struct i2c_client *client)
+{
+	struct as6200 *as;
+	struct iio_dev *indio_dev;
+	int ret;
+
+	if (!i2c_check_functionality(client->adapter, I2C_FUNC_I2C))
+		return -EINVAL;
+
+	indio_dev = devm_iio_device_alloc(&client->dev, 0);
+	if (!indio_dev)
+		return -ENOMEM;
+
+	as = devm_kzalloc(&client->dev, sizeof(*as), GFP_KERNEL);
+	if (IS_ERR(as))
+		return PTR_ERR(as);
+
+	as->regmap = devm_regmap_init_i2c(client, &as6200_regmap_config);
+	if (IS_ERR(as->regmap))
+		return PTR_ERR(as->regmap);
+
+	mutex_init(&as->lock);
+
+	as->dev = &client->dev;
+	as->indio_dev = indio_dev;
+
+	iio_device_set_drvdata(indio_dev, as);
+
+	indio_dev->modes = INDIO_DIRECT_MODE;
+	indio_dev->channels = as6200_temp_channels;
+	indio_dev->num_channels = ARRAY_SIZE(as6200_temp_channels);
+	indio_dev->name = client->name;
+	indio_dev->info = &as6200_temp_info;
+
+	ret = devm_iio_triggered_buffer_setup(as->dev, indio_dev,
+					      NULL,
+					      as6200_trigger_handler,
+					      NULL);
+	if (ret)
+		return ret;
+
+	if (client->irq) {
+		ret = devm_request_threaded_irq(as->dev,
+						client->irq,
+						NULL,
+						&as6200_event_handler,
+						IRQF_ONESHOT,
+						client->name,
+						indio_dev);
+		if (ret)
+			return ret;
+	}
+
+	i2c_set_clientdata(client, as);
+
+	return iio_device_register(indio_dev);
+}
+
+static void as6200_remove(struct i2c_client *client)
+{
+	struct as6200 *as = i2c_get_clientdata(client);
+
+	iio_device_unregister(as->indio_dev);
+}
+
+static int __maybe_unused as6200_suspend(struct device *dev)
+{
+	struct i2c_client *client = to_i2c_client(dev);
+	struct as6200 *as = i2c_get_clientdata(client);
+
+	if (client->irq)
+		disable_irq(client->irq);
+
+	return as6200_modify_config_reg(as, AS_CONFIG_SM, 1);
+}
+
+static int __maybe_unused as6200_resume(struct device *dev)
+{
+	struct i2c_client *client = to_i2c_client(dev);
+	struct as6200 *as = i2c_get_clientdata(client);
+
+	if (client->irq)
+		enable_irq(client->irq);
+
+	return as6200_modify_config_reg(as, AS_CONFIG_SM, 0);
+}
+
+static const struct dev_pm_ops as6200_pm_ops = {
+	SET_SYSTEM_SLEEP_PM_OPS(as6200_suspend, as6200_resume)
+};
+
+static const struct i2c_device_id as6200_id_table[] = {
+	{ "as6200" },
+	{ },
+};
+MODULE_DEVICE_TABLE(i2c, as6200_id_table);
+
+static const struct of_device_id as6200_of_match[] = {
+	{ .compatible = "ams,as6200" },
+	{ },
+};
+MODULE_DEVICE_TABLE(of, as6200_of_match);
+
+static struct i2c_driver as6200_driver = {
+	.driver = {
+		.name = "as6200",
+		.pm = &as6200_pm_ops,
+		.of_match_table = as6200_of_match,
+	},
+	.probe = as6200_probe,
+	.remove = as6200_remove,
+	.id_table = as6200_id_table,
+};
+module_i2c_driver(as6200_driver);
+
+MODULE_AUTHOR("Abdel Alkuor <alkuor@...il.com");
+MODULE_DESCRIPTION("AMS AS6200 Temperature Sensor");
+MODULE_LICENSE("GPL");
-- 
2.34.1

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