diff options
Diffstat (limited to 'drivers/iio/chemical/ccs811.c')
| -rw-r--r-- | drivers/iio/chemical/ccs811.c | 87 |
1 files changed, 85 insertions, 2 deletions
diff --git a/drivers/iio/chemical/ccs811.c b/drivers/iio/chemical/ccs811.c index 840a6cbd5f0f..97bce8345c6a 100644 --- a/drivers/iio/chemical/ccs811.c +++ b/drivers/iio/chemical/ccs811.c @@ -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; @@ -270,7 +280,31 @@ static int ccs811_read_raw(struct iio_dev *indio_dev, static const struct iio_info ccs811_info = { .read_raw = ccs811_read_raw, - .driver_module = THIS_MODULE, +}; + +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) @@ -298,6 +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) { @@ -346,16 +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); @@ -367,6 +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); @@ -376,9 +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); |