diff options
Diffstat (limited to 'drivers/iio/proximity/srf08.c')
| -rw-r--r-- | drivers/iio/proximity/srf08.c | 60 |
1 files changed, 57 insertions, 3 deletions
diff --git a/drivers/iio/proximity/srf08.c b/drivers/iio/proximity/srf08.c index 3f19536f215f..de699d67310a 100644 --- a/drivers/iio/proximity/srf08.c +++ b/drivers/iio/proximity/srf08.c @@ -18,6 +18,9 @@ #include <linux/bitops.h> #include <linux/iio/iio.h> #include <linux/iio/sysfs.h> +#include <linux/iio/buffer.h> +#include <linux/iio/trigger_consumer.h> +#include <linux/iio/triggered_buffer.h> /* registers of SRF08 device */ #define SRF08_WRITE_COMMAND 0x00 /* Command Register */ @@ -35,9 +38,22 @@ struct srf08_data { struct i2c_client *client; - int sensitivity; /* Gain */ - int range_mm; /* max. Range in mm */ + + /* + * Gain in the datasheet is called sensitivity here to distinct it + * from the gain used with amplifiers of adc's + */ + int sensitivity; + + /* max. Range in mm */ + int range_mm; struct mutex lock; + + /* + * triggered buffer + * 1x16-bit channel + 3x16 padding + 4x16 timestamp + */ + s16 buffer[8]; }; /* @@ -110,6 +126,29 @@ static int srf08_read_ranging(struct srf08_data *data) return ret; } +static irqreturn_t srf08_trigger_handler(int irq, void *p) +{ + struct iio_poll_func *pf = p; + struct iio_dev *indio_dev = pf->indio_dev; + struct srf08_data *data = iio_priv(indio_dev); + s16 sensor_data; + + sensor_data = srf08_read_ranging(data); + if (sensor_data < 0) + goto err; + + mutex_lock(&data->lock); + + data->buffer[0] = sensor_data; + iio_push_to_buffers_with_timestamp(indio_dev, + data->buffer, pf->timestamp); + + mutex_unlock(&data->lock); +err: + iio_trigger_notify_done(indio_dev->trig); + return IRQ_HANDLED; +} + static int srf08_read_raw(struct iio_dev *indio_dev, struct iio_chan_spec const *channel, int *val, int *val2, long mask) @@ -323,7 +362,15 @@ static const struct iio_chan_spec srf08_channels[] = { .info_mask_separate = BIT(IIO_CHAN_INFO_RAW) | BIT(IIO_CHAN_INFO_SCALE), + .scan_index = 0, + .scan_type = { + .sign = 's', + .realbits = 16, + .storagebits = 16, + .endianness = IIO_CPU, + }, }, + IIO_CHAN_SOFT_TIMESTAMP(1), }; static const struct iio_info srf08_info = { @@ -362,6 +409,13 @@ static int srf08_probe(struct i2c_client *client, mutex_init(&data->lock); + ret = devm_iio_triggered_buffer_setup(&client->dev, indio_dev, + iio_pollfunc_store_time, srf08_trigger_handler, NULL); + if (ret < 0) { + dev_err(&client->dev, "setup of iio triggered buffer failed\n"); + return ret; + } + /* * set default values of device here * these register values cannot be read from the hardware @@ -402,5 +456,5 @@ static struct i2c_driver srf08_driver = { module_i2c_driver(srf08_driver); MODULE_AUTHOR("Andreas Klinger <ak@it-klinger.de>"); -MODULE_DESCRIPTION("Devantech SRF08 ultrasonic ranger driver"); +MODULE_DESCRIPTION("Devantech SRF08/SRF10 ultrasonic ranger driver"); MODULE_LICENSE("GPL"); |