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Date: Wed, 4 Jan 2023 03:36:12 -0800
From: Andrew Hepp <andrew.hepp@...pp.dev>
To: linux-iio@...r.kernel.org, linux-kernel@...r.kernel.org,
Jonathan Cameron <jic23@...nel.org>
Cc: "Andrew.Hepp" <andrew.hepp@...pp.dev>
Subject: [PATCH] iio: temperature: Add MCP9600 thermocouple EMF converter driver
From: "Andrew.Hepp" <andrew.hepp@...pp.dev>
Add support for the MCP9600 thermocouple EMF converter.
Datasheet: https://ww1.microchip.com/downloads/en/DeviceDoc/MCP960X-Data-Sheet-20005426.pdf
Signed-off-by: Andrew Hepp <andrew.hepp@...pp.dev>
---
drivers/iio/temperature/Kconfig | 10 ++
drivers/iio/temperature/Makefile | 1 +
drivers/iio/temperature/mcp9600.c | 174 ++++++++++++++++++++++++++++++
3 files changed, 185 insertions(+)
create mode 100644 drivers/iio/temperature/mcp9600.c
diff --git a/drivers/iio/temperature/Kconfig b/drivers/iio/temperature/Kconfig
index ed384f33e0c7..ea2ce364b2e9 100644
--- a/drivers/iio/temperature/Kconfig
+++ b/drivers/iio/temperature/Kconfig
@@ -158,4 +158,14 @@ config MAX31865
This driver can also be build as a module. If so, the module
will be called max31865.
+config MCP9600
+ tristate "MCP9600 thermocouple EMF converter"
+ depends on I2C
+ help
+ If you say yes here you get support for MCP9600
+ thermocouple EMF converter connected via I2C.
+
+ This driver can also be built as a module. If so, the module
+ will be called mcp9600.
+
endmenu
diff --git a/drivers/iio/temperature/Makefile b/drivers/iio/temperature/Makefile
index dfec8c6d3019..9330d4a39598 100644
--- a/drivers/iio/temperature/Makefile
+++ b/drivers/iio/temperature/Makefile
@@ -10,6 +10,7 @@ obj-$(CONFIG_MAXIM_THERMOCOUPLE) += maxim_thermocouple.o
obj-$(CONFIG_MAX30208) += max30208.o
obj-$(CONFIG_MAX31856) += max31856.o
obj-$(CONFIG_MAX31865) += max31865.o
+obj-$(CONFIG_MCP9600) += mcp9600.o
obj-$(CONFIG_MLX90614) += mlx90614.o
obj-$(CONFIG_MLX90632) += mlx90632.o
obj-$(CONFIG_TMP006) += tmp006.o
diff --git a/drivers/iio/temperature/mcp9600.c b/drivers/iio/temperature/mcp9600.c
new file mode 100644
index 000000000000..2c1c4bb5e1c3
--- /dev/null
+++ b/drivers/iio/temperature/mcp9600.c
@@ -0,0 +1,174 @@
+// SPDX-License-Identifier: GPL-2.0+
+/*
+ * mcp9600.c - Support for Microchip MCP9600 thermocouple EMF converter
+ *
+ * Copyright (c) 2022 Andrew Hepp
+ * Author: <andrew.hepp@...pp.dev>
+ */
+
+#include <linux/err.h>
+#include <linux/i2c.h>
+#include <linux/init.h>
+#include <linux/mod_devicetable.h>
+#include <linux/module.h>
+
+#include <linux/iio/iio.h>
+#include <linux/iio/sysfs.h>
+
+/* MCP9600 registers */
+#define MCP9600_HOT_JUNCTION 0x0
+#define MCP9600_COLD_JUNCTION 0x2
+#define MCP9600_DEVICE_ID 0x20
+
+/* MCP9600 device id value */
+#define MCP9600_DEVICE_ID_MCP9600 0x40
+
+static const struct iio_chan_spec mcp9600_channels[] = {
+ {
+ .type = IIO_TEMP,
+ .address = MCP9600_HOT_JUNCTION,
+ .info_mask_separate =
+ BIT(IIO_CHAN_INFO_RAW) | BIT(IIO_CHAN_INFO_SCALE),
+ .scan_index = 0,
+ .scan_type = {
+ .sign = 's',
+ .realbits = 16,
+ .storagebits = 16,
+ .shift = 0,
+ .endianness = IIO_BE,
+ },
+ },
+ {
+ .type = IIO_TEMP,
+ .address = MCP9600_COLD_JUNCTION,
+ .channel2 = IIO_MOD_TEMP_AMBIENT,
+ .modified = 1,
+ .info_mask_separate =
+ BIT(IIO_CHAN_INFO_RAW) | BIT(IIO_CHAN_INFO_SCALE),
+ .scan_index = 1,
+ .scan_type = {
+ .sign = 's',
+ .realbits = 13,
+ .storagebits = 16,
+ .shift = 0,
+ .endianness = IIO_BE,
+ },
+ },
+ IIO_CHAN_SOFT_TIMESTAMP(2),
+};
+
+struct mcp9600_data {
+ struct i2c_client *client;
+};
+
+static int mcp9600_read(struct mcp9600_data *data,
+ struct iio_chan_spec const *chan, int *val)
+{
+ __be16 buf;
+ int ret;
+
+ ret = i2c_smbus_read_i2c_block_data(data->client, chan->address, 2,
+ (u8 *)&buf);
+ if (ret < 0)
+ return ret;
+ *val = be16_to_cpu(buf);
+
+ return 0;
+}
+
+static int mcp9600_read_raw(struct iio_dev *indio_dev,
+ struct iio_chan_spec const *chan, int *val,
+ int *val2, long mask)
+{
+ struct mcp9600_data *data = iio_priv(indio_dev);
+ int ret = -EINVAL;
+
+ switch (mask) {
+ case IIO_CHAN_INFO_RAW:
+ ret = iio_device_claim_direct_mode(indio_dev);
+ if (ret)
+ return ret;
+
+ ret = mcp9600_read(data, chan, val);
+ iio_device_release_direct_mode(indio_dev);
+ if (!ret)
+ return IIO_VAL_INT;
+
+ break;
+ case IIO_CHAN_INFO_SCALE:
+ *val = 62;
+ *val2 = 500000;
+ ret = IIO_VAL_INT_PLUS_MICRO;
+ break;
+ }
+
+ return ret;
+}
+
+static const struct iio_info mcp9600_info = {
+ .read_raw = mcp9600_read_raw,
+};
+
+static int mcp9600_probe(struct i2c_client *client)
+{
+ struct iio_dev *indio_dev;
+ struct mcp9600_data *data;
+ int ret;
+
+ ret = i2c_smbus_read_byte_data(client, MCP9600_DEVICE_ID);
+ if (ret < 0)
+ return ret;
+ if (ret != MCP9600_DEVICE_ID_MCP9600)
+ return -ENODEV;
+
+ indio_dev = devm_iio_device_alloc(&client->dev, sizeof(*data));
+ if (!indio_dev)
+ return -ENOMEM;
+
+ data = iio_priv(indio_dev);
+ data->client = client;
+
+ i2c_set_clientdata(client, indio_dev);
+ indio_dev->info = &mcp9600_info;
+ indio_dev->name = "mcp9600";
+ indio_dev->modes = INDIO_DIRECT_MODE;
+ indio_dev->channels = mcp9600_channels;
+ indio_dev->num_channels = ARRAY_SIZE(mcp9600_channels);
+
+ return iio_device_register(indio_dev);
+}
+
+static int mcp9600_remove(struct i2c_client *client)
+{
+ struct iio_dev *indio_dev;
+ printk(KERN_ALERT "mcp9600_remove\n");
+
+ indio_dev = i2c_get_clientdata(client);
+
+ iio_device_unregister(indio_dev);
+ return 0;
+}
+
+static const struct i2c_device_id mcp9600_id[] = { { "mcp9600" }, {} };
+MODULE_DEVICE_TABLE(i2c, mcp9600_id);
+
+static const struct of_device_id mcp9600_of_match[] = {
+ { .compatible = "microchip,mcp9600" },
+ {}
+};
+MODULE_DEVICE_TABLE(of, mcp9600_of_match);
+
+static struct i2c_driver mcp9600_driver = {
+ .driver = {
+ .name = "mcp9600",
+ .of_match_table = mcp9600_of_match,
+ },
+ .probe_new = mcp9600_probe,
+ .remove = mcp9600_remove,
+ .id_table = mcp9600_id
+};
+module_i2c_driver(mcp9600_driver);
+
+MODULE_AUTHOR("Andrew Hepp <andrew.hepp@...pp.dev>");
+MODULE_DESCRIPTION("Microchip MCP9600 thermocouple EMF converter driver");
+MODULE_LICENSE("GPL");
--
2.30.2
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