1 // SPDX-License-Identifier: GPL-2.0+
3  * ams-iaq-core.c - Support for AMS iAQ-Core VOC sensors
61 	struct i2c_client *client = data->client;  in ams_iaqcore_read_measurement()
65 		.addr = client->addr,  in ams_iaqcore_read_measurement()
66 		.flags = client->flags | I2C_M_RD,  in ams_iaqcore_read_measurement()
68 		.buf = (char *) &data->buffer,  in ams_iaqcore_read_measurement()
71 	ret = i2c_transfer(client->adapter, &msg, 1);  in ams_iaqcore_read_measurement()
80 	/* sensor can only be polled once a second max per datasheet */  in ams_iaqcore_get_measurement()
81 	if (!time_after(jiffies, data->last_update + HZ))  in ams_iaqcore_get_measurement()
88 	data->last_update = jiffies;  in ams_iaqcore_get_measurement()
101 		return -EINVAL;  in ams_iaqcore_read_raw()
103 	mutex_lock(&data->lock);  in ams_iaqcore_read_raw()
109 	switch (chan->address) {  in ams_iaqcore_read_raw()
112 		*val2 = be16_to_cpu(data->buffer.co2_ppm);  in ams_iaqcore_read_raw()
116 		*val = be32_to_cpu(data->buffer.resistance);  in ams_iaqcore_read_raw()
121 		*val2 = be16_to_cpu(data->buffer.voc_ppb);  in ams_iaqcore_read_raw()
125 		ret = -EINVAL;  in ams_iaqcore_read_raw()
129 	mutex_unlock(&data->lock);  in ams_iaqcore_read_raw()
143 	indio_dev = devm_iio_device_alloc(&client->dev, sizeof(*data));  in ams_iaqcore_probe()
145 		return -ENOMEM;  in ams_iaqcore_probe()
149 	data->client = client;  in ams_iaqcore_probe()
152 	data->last_update = jiffies - HZ;  in ams_iaqcore_probe()
153 	mutex_init(&data->lock);  in ams_iaqcore_probe()
155 	indio_dev->info = &ams_iaqcore_info;  in ams_iaqcore_probe()
156 	indio_dev->name = dev_name(&client->dev);  in ams_iaqcore_probe()
157 	indio_dev->modes = INDIO_DIRECT_MODE;  in ams_iaqcore_probe()
159 	indio_dev->channels = ams_iaqcore_channels;  in ams_iaqcore_probe()
160 	indio_dev->num_channels = ARRAY_SIZE(ams_iaqcore_channels);  in ams_iaqcore_probe()
162 	return devm_iio_device_register(&client->dev, indio_dev);  in ams_iaqcore_probe()
166 	{ "ams-iaq-core" },
172 	{ .compatible = "ams,iaq-core" },
179 		.name	= "ams-iaq-core",
188 MODULE_DESCRIPTION("AMS iAQ-Core VOC sensors");