summaryrefslogtreecommitdiffstats
path: root/drivers/iio/temperature/iqs620at-temp.c
diff options
context:
space:
mode:
Diffstat (limited to 'drivers/iio/temperature/iqs620at-temp.c')
-rw-r--r--drivers/iio/temperature/iqs620at-temp.c98
1 files changed, 98 insertions, 0 deletions
diff --git a/drivers/iio/temperature/iqs620at-temp.c b/drivers/iio/temperature/iqs620at-temp.c
new file mode 100644
index 0000000000..e2f878d57a
--- /dev/null
+++ b/drivers/iio/temperature/iqs620at-temp.c
@@ -0,0 +1,98 @@
+// SPDX-License-Identifier: GPL-2.0+
+/*
+ * Azoteq IQS620AT Temperature Sensor
+ *
+ * Copyright (C) 2019 Jeff LaBundy <jeff@labundy.com>
+ */
+
+#include <linux/device.h>
+#include <linux/iio/iio.h>
+#include <linux/kernel.h>
+#include <linux/mfd/iqs62x.h>
+#include <linux/module.h>
+#include <linux/platform_device.h>
+#include <linux/regmap.h>
+
+#define IQS620_TEMP_UI_OUT 0x1A
+
+#define IQS620_TEMP_SCALE 1000
+#define IQS620_TEMP_OFFSET (-100)
+#define IQS620_TEMP_OFFSET_V3 (-40)
+
+static int iqs620_temp_read_raw(struct iio_dev *indio_dev,
+ struct iio_chan_spec const *chan,
+ int *val, int *val2, long mask)
+{
+ struct iqs62x_core *iqs62x = iio_device_get_drvdata(indio_dev);
+ int ret;
+ __le16 val_buf;
+
+ switch (mask) {
+ case IIO_CHAN_INFO_RAW:
+ ret = regmap_raw_read(iqs62x->regmap, IQS620_TEMP_UI_OUT,
+ &val_buf, sizeof(val_buf));
+ if (ret)
+ return ret;
+
+ *val = le16_to_cpu(val_buf);
+ return IIO_VAL_INT;
+
+ case IIO_CHAN_INFO_SCALE:
+ *val = IQS620_TEMP_SCALE;
+ return IIO_VAL_INT;
+
+ case IIO_CHAN_INFO_OFFSET:
+ *val = iqs62x->hw_num < IQS620_HW_NUM_V3 ? IQS620_TEMP_OFFSET
+ : IQS620_TEMP_OFFSET_V3;
+ return IIO_VAL_INT;
+
+ default:
+ return -EINVAL;
+ }
+}
+
+static const struct iio_info iqs620_temp_info = {
+ .read_raw = &iqs620_temp_read_raw,
+};
+
+static const struct iio_chan_spec iqs620_temp_channels[] = {
+ {
+ .type = IIO_TEMP,
+ .info_mask_separate = BIT(IIO_CHAN_INFO_RAW) |
+ BIT(IIO_CHAN_INFO_SCALE) |
+ BIT(IIO_CHAN_INFO_OFFSET),
+ },
+};
+
+static int iqs620_temp_probe(struct platform_device *pdev)
+{
+ struct iqs62x_core *iqs62x = dev_get_drvdata(pdev->dev.parent);
+ struct iio_dev *indio_dev;
+
+ indio_dev = devm_iio_device_alloc(&pdev->dev, 0);
+ if (!indio_dev)
+ return -ENOMEM;
+
+ iio_device_set_drvdata(indio_dev, iqs62x);
+
+ indio_dev->modes = INDIO_DIRECT_MODE;
+ indio_dev->channels = iqs620_temp_channels;
+ indio_dev->num_channels = ARRAY_SIZE(iqs620_temp_channels);
+ indio_dev->name = iqs62x->dev_desc->dev_name;
+ indio_dev->info = &iqs620_temp_info;
+
+ return devm_iio_device_register(&pdev->dev, indio_dev);
+}
+
+static struct platform_driver iqs620_temp_platform_driver = {
+ .driver = {
+ .name = "iqs620at-temp",
+ },
+ .probe = iqs620_temp_probe,
+};
+module_platform_driver(iqs620_temp_platform_driver);
+
+MODULE_AUTHOR("Jeff LaBundy <jeff@labundy.com>");
+MODULE_DESCRIPTION("Azoteq IQS620AT Temperature Sensor");
+MODULE_LICENSE("GPL");
+MODULE_ALIAS("platform:iqs620at-temp");