diff options
| -rw-r--r-- | drivers/iio/chemical/Kconfig | 2 | ||||
| -rw-r--r-- | drivers/iio/chemical/ccs811.c | 76 |
2 files changed, 73 insertions, 5 deletions
diff --git a/drivers/iio/chemical/Kconfig b/drivers/iio/chemical/Kconfig index 4d799b5cceac..5cb5be7612b4 100644 --- a/drivers/iio/chemical/Kconfig +++ b/drivers/iio/chemical/Kconfig @@ -24,6 +24,8 @@ config ATLAS_PH_SENSOR config CCS811 tristate "AMS CCS811 VOC sensor" depends on I2C + select IIO_BUFFER + select IIO_TRIGGERED_BUFFER help Say Y here to build I2C interface support for the AMS CCS811 VOC (Volatile Organic Compounds) sensor diff --git a/drivers/iio/chemical/ccs811.c b/drivers/iio/chemical/ccs811.c index 8dbb5eddeb1f..840a6cbd5f0f 100644 --- a/drivers/iio/chemical/ccs811.c +++ b/drivers/iio/chemical/ccs811.c @@ -21,6 +21,9 @@ #include <linux/delay.h> #include <linux/i2c.h> #include <linux/iio/iio.h> +#include <linux/iio/buffer.h> +#include <linux/iio/triggered_buffer.h> +#include <linux/iio/trigger_consumer.h> #include <linux/module.h> #define CCS811_STATUS 0x00 @@ -76,25 +79,42 @@ static const struct iio_chan_spec ccs811_channels[] = { { .type = IIO_CURRENT, .info_mask_separate = BIT(IIO_CHAN_INFO_RAW) | - BIT(IIO_CHAN_INFO_SCALE) + BIT(IIO_CHAN_INFO_SCALE), + .scan_index = -1, }, { .type = IIO_VOLTAGE, .info_mask_separate = BIT(IIO_CHAN_INFO_RAW) | - BIT(IIO_CHAN_INFO_SCALE) + BIT(IIO_CHAN_INFO_SCALE), + .scan_index = -1, }, { .type = IIO_CONCENTRATION, .channel2 = IIO_MOD_CO2, .modified = 1, .info_mask_separate = BIT(IIO_CHAN_INFO_RAW) | BIT(IIO_CHAN_INFO_OFFSET) | - BIT(IIO_CHAN_INFO_SCALE) + BIT(IIO_CHAN_INFO_SCALE), + .scan_index = 0, + .scan_type = { + .sign = 'u', + .realbits = 16, + .storagebits = 16, + .endianness = IIO_BE, + }, }, { .type = IIO_CONCENTRATION, .channel2 = IIO_MOD_VOC, .modified = 1, .info_mask_separate = BIT(IIO_CHAN_INFO_RAW) | - BIT(IIO_CHAN_INFO_SCALE) + BIT(IIO_CHAN_INFO_SCALE), + .scan_index = 1, + .scan_type = { + .sign = 'u', + .realbits = 16, + .storagebits = 16, + .endianness = IIO_BE, + }, }, + IIO_CHAN_SOFT_TIMESTAMP(2), }; /* @@ -253,6 +273,31 @@ static const struct iio_info ccs811_info = { .driver_module = THIS_MODULE, }; +static irqreturn_t ccs811_trigger_handler(int irq, void *p) +{ + struct iio_poll_func *pf = p; + struct iio_dev *indio_dev = pf->indio_dev; + struct ccs811_data *data = iio_priv(indio_dev); + struct i2c_client *client = data->client; + s16 buf[8]; /* s16 eCO2 + s16 TVOC + padding + 8 byte timestamp */ + int ret; + + ret = i2c_smbus_read_i2c_block_data(client, CCS811_ALG_RESULT_DATA, 4, + (u8 *)&buf); + if (ret != 4) { + dev_err(&client->dev, "cannot read sensor data\n"); + goto err; + } + + iio_push_to_buffers_with_timestamp(indio_dev, buf, + iio_get_time_ns(indio_dev)); + +err: + iio_trigger_notify_done(indio_dev->trig); + + return IRQ_HANDLED; +} + static int ccs811_probe(struct i2c_client *client, const struct i2c_device_id *id) { @@ -305,7 +350,27 @@ static int ccs811_probe(struct i2c_client *client, indio_dev->channels = ccs811_channels; indio_dev->num_channels = ARRAY_SIZE(ccs811_channels); - return iio_device_register(indio_dev); + ret = iio_triggered_buffer_setup(indio_dev, NULL, + ccs811_trigger_handler, NULL); + + if (ret < 0) { + dev_err(&client->dev, "triggered buffer setup failed\n"); + goto err_poweroff; + } + + ret = iio_device_register(indio_dev); + if (ret < 0) { + dev_err(&client->dev, "unable to register iio device\n"); + goto err_buffer_cleanup; + } + return 0; + +err_buffer_cleanup: + iio_triggered_buffer_cleanup(indio_dev); +err_poweroff: + i2c_smbus_write_byte_data(client, CCS811_MEAS_MODE, CCS811_MODE_IDLE); + + return ret; } static int ccs811_remove(struct i2c_client *client) @@ -313,6 +378,7 @@ static int ccs811_remove(struct i2c_client *client) struct iio_dev *indio_dev = i2c_get_clientdata(client); iio_device_unregister(indio_dev); + iio_triggered_buffer_cleanup(indio_dev); return i2c_smbus_write_byte_data(client, CCS811_MEAS_MODE, CCS811_MODE_IDLE); |