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iio: chemical: ccs811: Add triggered buffer support 

A software trigger such as hrtimer can be used to capture the data
that will be stored in the buffer.

Cc: Daniel Baluta <daniel.baluta@gmail.com>
Cc: Alison Schofield <amsfield22@gmail.com>
Signed-off-by: Narcisa Ana Maria Vasile <narcisaanamaria12@gmail.com>
Signed-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>
hifive-unleashed-5.1
Narcisa Ana Maria Vasile 2017-08-17 14:34:29 +03:00 committed by Jonathan Cameron
parent dc2696ba46
commit 283d26917a
2 changed files with 73 additions and 5 deletions
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2
drivers/iio/chemical/Kconfig
View File

@ -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

76
drivers/iio/chemical/ccs811.c
View File

@ -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);