redonkable
/
alistair23-linux
1
0
Fork 0
Code Releases Activity

iio: chemical: ccs811: Add support for data ready trigger 

Add data ready trigger for hardware interrupts that signal
new, available measurement samples.

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 2017-09-07 21:38:37 +03:00 committed by Jonathan Cameron
parent 605f72de13
commit f1f065d7ac
1 changed files with 85 additions and 1 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

86
drivers/iio/chemical/ccs811.c
View File

@ -22,6 +22,7 @@
#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>
@ -59,6 +60,8 @@
#define CCS811_MODE_IAQ_60SEC 0x30
#define CCS811_MODE_RAW_DATA 0x40
#define CCS811_MEAS_MODE_INTERRUPT BIT(3)
#define CCS811_VOLTAGE_MASK 0x3FF
struct ccs811_reading {
@ -73,6 +76,8 @@ struct ccs811_data {
struct i2c_client *client;
struct mutex lock; /* Protect readings */
struct ccs811_reading buffer;
struct iio_trigger *drdy_trig;
bool drdy_trig_on;
};
static const struct iio_chan_spec ccs811_channels[] = {
@ -193,10 +198,14 @@ static int ccs811_read_raw(struct iio_dev *indio_dev,
switch (mask) {
case IIO_CHAN_INFO_RAW:
ret = iio_device_claim_direct_mode(indio_dev);
if (ret)
return ret;
mutex_lock(&data->lock);
ret = ccs811_get_measurement(data);
if (ret < 0) {
mutex_unlock(&data->lock);
iio_device_release_direct_mode(indio_dev);
return ret;
}
@ -228,6 +237,7 @@ static int ccs811_read_raw(struct iio_dev *indio_dev,
ret = -EINVAL;
}
mutex_unlock(&data->lock);
iio_device_release_direct_mode(indio_dev);
return ret;
@ -272,6 +282,31 @@ static const struct iio_info ccs811_info = {
.read_raw = ccs811_read_raw,
};
static int ccs811_set_trigger_state(struct iio_trigger *trig,
bool state)
{
struct iio_dev *indio_dev = iio_trigger_get_drvdata(trig);
struct ccs811_data *data = iio_priv(indio_dev);
int ret;
ret = i2c_smbus_read_byte_data(data->client, CCS811_MEAS_MODE);
if (ret < 0)
return ret;
if (state)
ret |= CCS811_MEAS_MODE_INTERRUPT;
else
ret &= ~CCS811_MEAS_MODE_INTERRUPT;
data->drdy_trig_on = state;
return i2c_smbus_write_byte_data(data->client, CCS811_MEAS_MODE, ret);
}
static const struct iio_trigger_ops ccs811_trigger_ops = {
.set_trigger_state = ccs811_set_trigger_state,
};
static irqreturn_t ccs811_trigger_handler(int irq, void *p)
{
struct iio_poll_func *pf = p;
@ -297,6 +332,17 @@ err:
return IRQ_HANDLED;
}
static irqreturn_t ccs811_data_rdy_trigger_poll(int irq, void *private)
{
struct iio_dev *indio_dev = private;
struct ccs811_data *data = iio_priv(indio_dev);
if (data->drdy_trig_on)
iio_trigger_poll(data->drdy_trig);
return IRQ_HANDLED;
}
static int ccs811_probe(struct i2c_client *client,
const struct i2c_device_id *id)
{
@ -345,16 +391,48 @@ static int ccs811_probe(struct i2c_client *client,
indio_dev->dev.parent = &client->dev;
indio_dev->name = id->name;
indio_dev->info = &ccs811_info;
indio_dev->modes = INDIO_DIRECT_MODE;
indio_dev->channels = ccs811_channels;
indio_dev->num_channels = ARRAY_SIZE(ccs811_channels);
if (client->irq > 0) {
ret = devm_request_threaded_irq(&client->dev, client->irq,
ccs811_data_rdy_trigger_poll,
NULL,
IRQF_TRIGGER_FALLING |
IRQF_ONESHOT,
"ccs811_irq", indio_dev);
if (ret) {
dev_err(&client->dev, "irq request error %d\n", -ret);
goto err_poweroff;
}
data->drdy_trig = devm_iio_trigger_alloc(&client->dev,
"%s-dev%d",
indio_dev->name,
indio_dev->id);
if (!data->drdy_trig) {
ret = -ENOMEM;
goto err_poweroff;
}
data->drdy_trig->dev.parent = &client->dev;
data->drdy_trig->ops = &ccs811_trigger_ops;
iio_trigger_set_drvdata(data->drdy_trig, indio_dev);
indio_dev->trig = data->drdy_trig;
iio_trigger_get(indio_dev->trig);
ret = iio_trigger_register(data->drdy_trig);
if (ret)
goto err_poweroff;
}
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;
goto err_trigger_unregister;
}
ret = iio_device_register(indio_dev);
@ -366,6 +444,9 @@ static int ccs811_probe(struct i2c_client *client,
err_buffer_cleanup:
iio_triggered_buffer_cleanup(indio_dev);
err_trigger_unregister:
if (data->drdy_trig)
iio_trigger_unregister(data->drdy_trig);
err_poweroff:
i2c_smbus_write_byte_data(client, CCS811_MEAS_MODE, CCS811_MODE_IDLE);
@ -375,9 +456,12 @@ err_poweroff:
static int ccs811_remove(struct i2c_client *client)
{
struct iio_dev *indio_dev = i2c_get_clientdata(client);
struct ccs811_data *data = iio_priv(indio_dev);
iio_device_unregister(indio_dev);
iio_triggered_buffer_cleanup(indio_dev);
if (data->drdy_trig)
iio_trigger_unregister(data->drdy_trig);
return i2c_smbus_write_byte_data(client, CCS811_MEAS_MODE,
CCS811_MODE_IDLE);