summaryrefslogtreecommitdiffstats
path: root/drivers/iio/chemical/ags02ma.c
diff options
context:
space:
mode:
Diffstat (limited to 'drivers/iio/chemical/ags02ma.c')
-rw-r--r--drivers/iio/chemical/ags02ma.c165
1 files changed, 165 insertions, 0 deletions
diff --git a/drivers/iio/chemical/ags02ma.c b/drivers/iio/chemical/ags02ma.c
new file mode 100644
index 0000000000..8fcd809465
--- /dev/null
+++ b/drivers/iio/chemical/ags02ma.c
@@ -0,0 +1,165 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
+/*
+ * Copyright (C) 2023 Anshul Dalal <anshulusr@gmail.com>
+ *
+ * Driver for Aosong AGS02MA
+ *
+ * Datasheet:
+ * https://asairsensors.com/wp-content/uploads/2021/09/AGS02MA.pdf
+ * Product Page:
+ * http://www.aosong.com/m/en/products-33.html
+ */
+
+#include <linux/crc8.h>
+#include <linux/delay.h>
+#include <linux/i2c.h>
+#include <linux/module.h>
+
+#include <linux/iio/iio.h>
+
+#define AGS02MA_TVOC_READ_REG 0x00
+#define AGS02MA_VERSION_REG 0x11
+
+#define AGS02MA_VERSION_PROCESSING_DELAY 30
+#define AGS02MA_TVOC_READ_PROCESSING_DELAY 1500
+
+#define AGS02MA_CRC8_INIT 0xff
+#define AGS02MA_CRC8_POLYNOMIAL 0x31
+
+DECLARE_CRC8_TABLE(ags02ma_crc8_table);
+
+struct ags02ma_data {
+ struct i2c_client *client;
+};
+
+struct ags02ma_reading {
+ __be32 data;
+ u8 crc;
+} __packed;
+
+static int ags02ma_register_read(struct i2c_client *client, u8 reg, u16 delay,
+ u32 *val)
+{
+ int ret;
+ u8 crc;
+ struct ags02ma_reading read_buffer;
+
+ ret = i2c_master_send(client, &reg, sizeof(reg));
+ if (ret < 0) {
+ dev_err(&client->dev,
+ "Failed to send data to register 0x%x: %d", reg, ret);
+ return ret;
+ }
+
+ /* Processing Delay, Check Table 7.7 in the datasheet */
+ msleep_interruptible(delay);
+
+ ret = i2c_master_recv(client, (u8 *)&read_buffer, sizeof(read_buffer));
+ if (ret < 0) {
+ dev_err(&client->dev,
+ "Failed to receive from register 0x%x: %d", reg, ret);
+ return ret;
+ }
+
+ crc = crc8(ags02ma_crc8_table, (u8 *)&read_buffer.data,
+ sizeof(read_buffer.data), AGS02MA_CRC8_INIT);
+ if (crc != read_buffer.crc) {
+ dev_err(&client->dev, "CRC error\n");
+ return -EIO;
+ }
+
+ *val = be32_to_cpu(read_buffer.data);
+ return 0;
+}
+
+static int ags02ma_read_raw(struct iio_dev *iio_device,
+ struct iio_chan_spec const *chan, int *val,
+ int *val2, long mask)
+{
+ int ret;
+ struct ags02ma_data *data = iio_priv(iio_device);
+
+ switch (mask) {
+ case IIO_CHAN_INFO_RAW:
+ ret = ags02ma_register_read(data->client, AGS02MA_TVOC_READ_REG,
+ AGS02MA_TVOC_READ_PROCESSING_DELAY,
+ val);
+ if (ret < 0)
+ return ret;
+ return IIO_VAL_INT;
+ case IIO_CHAN_INFO_SCALE:
+ /* The sensor reads data as ppb */
+ *val = 0;
+ *val2 = 100;
+ return IIO_VAL_INT_PLUS_NANO;
+ default:
+ return -EINVAL;
+ }
+}
+
+static const struct iio_info ags02ma_info = {
+ .read_raw = ags02ma_read_raw,
+};
+
+static const struct iio_chan_spec ags02ma_channel = {
+ .type = IIO_CONCENTRATION,
+ .channel2 = IIO_MOD_VOC,
+ .info_mask_separate = BIT(IIO_CHAN_INFO_RAW) |
+ BIT(IIO_CHAN_INFO_SCALE),
+};
+
+static int ags02ma_probe(struct i2c_client *client)
+{
+ int ret;
+ struct ags02ma_data *data;
+ struct iio_dev *indio_dev;
+ u32 version;
+
+ indio_dev = devm_iio_device_alloc(&client->dev, sizeof(*data));
+ if (!indio_dev)
+ return -ENOMEM;
+
+ crc8_populate_msb(ags02ma_crc8_table, AGS02MA_CRC8_POLYNOMIAL);
+
+ ret = ags02ma_register_read(client, AGS02MA_VERSION_REG,
+ AGS02MA_VERSION_PROCESSING_DELAY, &version);
+ if (ret < 0)
+ return dev_err_probe(&client->dev, ret,
+ "Failed to read device version\n");
+ dev_dbg(&client->dev, "Aosong AGS02MA, Version: 0x%x", version);
+
+ data = iio_priv(indio_dev);
+ data->client = client;
+ indio_dev->info = &ags02ma_info;
+ indio_dev->channels = &ags02ma_channel;
+ indio_dev->num_channels = 1;
+ indio_dev->name = "ags02ma";
+
+ return devm_iio_device_register(&client->dev, indio_dev);
+}
+
+static const struct i2c_device_id ags02ma_id_table[] = {
+ { "ags02ma" },
+ { /* Sentinel */ }
+};
+MODULE_DEVICE_TABLE(i2c, ags02ma_id_table);
+
+static const struct of_device_id ags02ma_of_table[] = {
+ { .compatible = "aosong,ags02ma" },
+ { /* Sentinel */ }
+};
+MODULE_DEVICE_TABLE(of, ags02ma_of_table);
+
+static struct i2c_driver ags02ma_driver = {
+ .driver = {
+ .name = "ags02ma",
+ .of_match_table = ags02ma_of_table,
+ },
+ .id_table = ags02ma_id_table,
+ .probe = ags02ma_probe,
+};
+module_i2c_driver(ags02ma_driver);
+
+MODULE_AUTHOR("Anshul Dalal <anshulusr@gmail.com>");
+MODULE_DESCRIPTION("Aosong AGS02MA TVOC Driver");
+MODULE_LICENSE("GPL");