// SPDX-License-Identifier: GPL-2.0-only /* * ccs811.c - Support for AMS CCS811 VOC Sensor * * Copyright (C) 2017 Narcisa Vasile <[email protected]> * * Datasheet: ams.com/content/download/951091/2269479/CCS811_DS000459_3-00.pdf * * IIO driver for AMS CCS811 (I2C address 0x5A/0x5B set by ADDR Low/High) * * TODO: * 1. Make the drive mode selectable form userspace * 2. Add support for interrupts * 3. Adjust time to wait for data to be ready based on selected operation mode * 4. Read error register and put the information in logs */ #include <linux/delay.h> #include <linux/gpio/consumer.h> #include <linux/i2c.h> #include <linux/iio/iio.h> #include <linux/iio/buffer.h> #include <linux/iio/trigger.h> #include <linux/iio/triggered_buffer.h> #include <linux/iio/trigger_consumer.h> #include <linux/module.h> #define CCS811_STATUS … #define CCS811_MEAS_MODE … #define CCS811_ALG_RESULT_DATA … #define CCS811_RAW_DATA … #define CCS811_HW_ID … #define CCS811_HW_ID_VALUE … #define CCS811_HW_VERSION … #define CCS811_HW_VERSION_VALUE … #define CCS811_HW_VERSION_MASK … #define CCS811_ERR … /* Used to transition from boot to application mode */ #define CCS811_APP_START … #define CCS811_SW_RESET … /* Status register flags */ #define CCS811_STATUS_ERROR … #define CCS811_STATUS_DATA_READY … #define CCS811_STATUS_APP_VALID_MASK … #define CCS811_STATUS_APP_VALID_LOADED … /* * Value of FW_MODE bit of STATUS register describes the sensor's state: * 0: Firmware is in boot mode, this allows new firmware to be loaded * 1: Firmware is in application mode. CCS811 is ready to take ADC measurements */ #define CCS811_STATUS_FW_MODE_MASK … #define CCS811_STATUS_FW_MODE_APPLICATION … /* Measurement modes */ #define CCS811_MODE_IDLE … #define CCS811_MODE_IAQ_1SEC … #define CCS811_MODE_IAQ_10SEC … #define CCS811_MODE_IAQ_60SEC … #define CCS811_MODE_RAW_DATA … #define CCS811_MEAS_MODE_INTERRUPT … #define CCS811_VOLTAGE_MASK … struct ccs811_reading { … } __attribute__((packed)); struct ccs811_data { … }; static const struct iio_chan_spec ccs811_channels[] = …; /* * The CCS811 powers-up in boot mode. A setup write to CCS811_APP_START will * transition the sensor to application mode. */ static int ccs811_start_sensor_application(struct i2c_client *client) { … } static int ccs811_setup(struct i2c_client *client) { … } static void ccs811_set_wakeup(struct ccs811_data *data, bool enable) { … } static int ccs811_get_measurement(struct ccs811_data *data) { … } static int ccs811_read_raw(struct iio_dev *indio_dev, struct iio_chan_spec const *chan, int *val, int *val2, long mask) { … } static const struct iio_info ccs811_info = …; static int ccs811_set_trigger_state(struct iio_trigger *trig, bool state) { … } static const struct iio_trigger_ops ccs811_trigger_ops = …; static irqreturn_t ccs811_trigger_handler(int irq, void *p) { … } static irqreturn_t ccs811_data_rdy_trigger_poll(int irq, void *private) { … } static int ccs811_reset(struct i2c_client *client) { … } static int ccs811_probe(struct i2c_client *client) { … } static void ccs811_remove(struct i2c_client *client) { … } static const struct i2c_device_id ccs811_id[] = …; MODULE_DEVICE_TABLE(i2c, ccs811_id); static const struct of_device_id ccs811_dt_ids[] = …; MODULE_DEVICE_TABLE(of, ccs811_dt_ids); static struct i2c_driver ccs811_driver = …; module_i2c_driver(…) …; MODULE_AUTHOR(…) …; MODULE_DESCRIPTION(…) …; MODULE_LICENSE(…) …;
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