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SubjectRe: [PATCH v5 4/4] iio: vcnl4000: Add buffer support for VCNL4010/20.
On Wed, 22 Apr 2020 15:08:56 +0200
Mathieu Othacehe <m.othacehe@gmail.com> wrote:

> The VCNL4010 and VCNL4020 chips are able to raise interrupts on data ready.
> Use it to provide triggered buffer support for proximity data.
>
> Those two chips also provide ambient light data. However, they are sampled
> at different rate than proximity data. As this is not handled by the IIO
> framework for now, and the sample frequencies of ambient light data are
> very low, do add buffer support for them.
>
> Signed-off-by: Mathieu Othacehe <m.othacehe@gmail.com>
Looks fine to me.

Jonathan

> ---
> drivers/iio/light/Kconfig | 2 +
> drivers/iio/light/vcnl4000.c | 159 ++++++++++++++++++++++++++++++++++-
> 2 files changed, 159 insertions(+), 2 deletions(-)
>
> diff --git a/drivers/iio/light/Kconfig b/drivers/iio/light/Kconfig
> index 74970f18a93b..05f61b1e223a 100644
> --- a/drivers/iio/light/Kconfig
> +++ b/drivers/iio/light/Kconfig
> @@ -506,6 +506,8 @@ config US5182D
>
> config VCNL4000
> tristate "VCNL4000/4010/4020/4200 combined ALS and proximity sensor"
> + select IIO_BUFFER
> + select IIO_TRIGGERED_BUFFER
> depends on I2C
> help
> Say Y here if you want to build a driver for the Vishay VCNL4000,
> diff --git a/drivers/iio/light/vcnl4000.c b/drivers/iio/light/vcnl4000.c
> index aefb549953ad..edba566ad6f6 100644
> --- a/drivers/iio/light/vcnl4000.c
> +++ b/drivers/iio/light/vcnl4000.c
> @@ -5,6 +5,7 @@
> *
> * Copyright 2012 Peter Meerwald <pmeerw@pmeerw.net>
> * Copyright 2019 Pursim SPC
> + * Copyright 2020 Mathieu Othacehe <m.othacehe@gmail.com>
> *
> * IIO driver for:
> * VCNL4000/10/20 (7-bit I2C slave address 0x13)
> @@ -13,8 +14,7 @@
> *
> * TODO:
> * allow to adjust IR current
> - * periodic ALS/proximity measurement (VCNL4010/20)
> - * interrupts (VCNL4010/20/40, VCNL4200)
> + * interrupts (VCNL4040, VCNL4200)
> */
>
> #include <linux/module.h>
> @@ -24,9 +24,13 @@
> #include <linux/pm_runtime.h>
> #include <linux/interrupt.h>
>
> +#include <linux/iio/buffer.h>
> #include <linux/iio/events.h>
> #include <linux/iio/iio.h>
> #include <linux/iio/sysfs.h>
> +#include <linux/iio/trigger.h>
> +#include <linux/iio/trigger_consumer.h>
> +#include <linux/iio/triggered_buffer.h>
>
> #define VCNL4000_DRV_NAME "vcnl4000"
> #define VCNL4000_PROD_ID 0x01
> @@ -768,7 +772,14 @@ static const struct iio_chan_spec vcnl4010_channels[] = {
> .event_spec = vcnl4000_event_spec,
> .num_event_specs = ARRAY_SIZE(vcnl4000_event_spec),
> .ext_info = vcnl4000_ext_info,
> + .scan_type = {
> + .sign = 'u',
> + .realbits = 16,
> + .storagebits = 16,
> + .endianness = IIO_CPU,
> + },
> },
> + IIO_CHAN_SOFT_TIMESTAMP(1),
> };
>
> static IIO_CONST_ATTR(in_proximity_sampling_frequency_available,
> @@ -882,10 +893,139 @@ static irqreturn_t vcnl4010_irq_thread(int irq, void *p)
> isr & VCNL4010_INT_THR);
> }
>
> + if (isr & VCNL4010_INT_DRDY && iio_buffer_enabled(indio_dev))
> + iio_trigger_poll_chained(indio_dev->trig);
> +
> end:
> return IRQ_HANDLED;
> }
>
> +static irqreturn_t vcnl4010_trigger_handler(int irq, void *p)
> +{
> + struct iio_poll_func *pf = p;
> + struct iio_dev *indio_dev = pf->indio_dev;
> + struct vcnl4000_data *data = iio_priv(indio_dev);
> + const unsigned long *active_scan_mask = indio_dev->active_scan_mask;
> + u16 buffer[8] = {0}; /* 1x16-bit + ts */
> + bool data_read = false;
> + unsigned long isr;
> + int val = 0;
> + int ret;
> +
> + ret = i2c_smbus_read_byte_data(data->client, VCNL4010_ISR);
> + if (ret < 0)
> + goto end;
> +
> + isr = ret;
> +
> + if (test_bit(0, active_scan_mask)) {
> + if (test_bit(VCNL4010_INT_PROXIMITY, &isr)) {
> + ret = vcnl4000_read_data(data,
> + VCNL4000_PS_RESULT_HI,
> + &val);
> + if (ret < 0)
> + goto end;
> +
> + buffer[0] = val;
> + data_read = true;
> + }
> + }
> +
> + ret = i2c_smbus_write_byte_data(data->client, VCNL4010_ISR,
> + isr & VCNL4010_INT_DRDY);
> + if (ret < 0)
> + goto end;
> +
> + if (!data_read)
> + goto end;
> +
> + iio_push_to_buffers_with_timestamp(indio_dev, buffer,
> + iio_get_time_ns(indio_dev));
> +
> +end:
> + iio_trigger_notify_done(indio_dev->trig);
> + return IRQ_HANDLED;
> +}
> +
> +static int vcnl4010_buffer_postenable(struct iio_dev *indio_dev)
> +{
> + struct vcnl4000_data *data = iio_priv(indio_dev);
> + int ret;
> + int cmd;
> +
> + ret = iio_triggered_buffer_postenable(indio_dev);
> + if (ret)
> + return ret;
> +
> + /* Do not enable the buffer if we are already capturing events. */
> + if (vcnl4010_is_in_periodic_mode(data)) {
> + ret = -EBUSY;
> + goto end;
> + }
> +
> + ret = i2c_smbus_write_byte_data(data->client, VCNL4010_INT_CTRL,
> + VCNL4010_INT_PROX_EN);
> + if (ret < 0)
> + goto end;
> +
> + cmd = VCNL4000_SELF_TIMED_EN | VCNL4000_PROX_EN;
> + ret = i2c_smbus_write_byte_data(data->client, VCNL4000_COMMAND, cmd);
> + if (ret < 0)
> + goto end;
> +
> +end:
> + if (ret < 0)
> + iio_triggered_buffer_predisable(indio_dev);
> +
> + return ret;
> +}
> +
> +static int vcnl4010_buffer_predisable(struct iio_dev *indio_dev)
> +{
> + struct vcnl4000_data *data = iio_priv(indio_dev);
> + int ret, ret_disable;
> +
> + ret = i2c_smbus_write_byte_data(data->client, VCNL4010_INT_CTRL, 0);
> + if (ret < 0)
> + goto end;
> +
> + ret = i2c_smbus_write_byte_data(data->client, VCNL4000_COMMAND, 0);
> +
> +end:
> + ret_disable = iio_triggered_buffer_predisable(indio_dev);
> + if (ret == 0)
> + ret = ret_disable;
> +
> + return ret;
> +}
> +
> +static const struct iio_buffer_setup_ops vcnl4010_buffer_ops = {
> + .postenable = &vcnl4010_buffer_postenable,
> + .predisable = &vcnl4010_buffer_predisable,
> +};
> +
> +static const struct iio_trigger_ops vcnl4010_trigger_ops = {
> + .validate_device = iio_trigger_validate_own_device,
> +};
> +
> +static int vcnl4010_probe_trigger(struct iio_dev *indio_dev)
> +{
> + struct vcnl4000_data *data = iio_priv(indio_dev);
> + struct i2c_client *client = data->client;
> + struct iio_trigger *trigger;
> +
> + trigger = devm_iio_trigger_alloc(&client->dev, "%s-dev%d",
> + indio_dev->name, indio_dev->id);
> + if (!trigger)
> + return -ENOMEM;
> +
> + trigger->dev.parent = &client->dev;
> + trigger->ops = &vcnl4010_trigger_ops;
> + iio_trigger_set_drvdata(trigger, indio_dev);
> +
> + return devm_iio_trigger_register(&client->dev, trigger);
> +}
> +
> static int vcnl4000_probe(struct i2c_client *client,
> const struct i2c_device_id *id)
> {
> @@ -922,6 +1062,16 @@ static int vcnl4000_probe(struct i2c_client *client,
> indio_dev->modes = INDIO_DIRECT_MODE;
>
> if (client->irq && data->chip_spec->irq_support) {
> + ret = devm_iio_triggered_buffer_setup(&client->dev, indio_dev,
> + NULL,
> + vcnl4010_trigger_handler,
> + &vcnl4010_buffer_ops);
> + if (ret < 0) {
> + dev_err(&client->dev,
> + "unable to setup iio triggered buffer\n");
> + return ret;
> + }
> +
> ret = devm_request_threaded_irq(&client->dev, client->irq,
> NULL, vcnl4010_irq_thread,
> IRQF_TRIGGER_FALLING |
> @@ -932,6 +1082,10 @@ static int vcnl4000_probe(struct i2c_client *client,
> dev_err(&client->dev, "irq request failed\n");
> return ret;
> }
> +
> + ret = vcnl4010_probe_trigger(indio_dev);
> + if (ret < 0)
> + return ret;
> }
>
> ret = pm_runtime_set_active(&client->dev);
> @@ -1027,5 +1181,6 @@ static struct i2c_driver vcnl4000_driver = {
> module_i2c_driver(vcnl4000_driver);
>
> MODULE_AUTHOR("Peter Meerwald <pmeerw@pmeerw.net>");
> +MODULE_AUTHOR("Mathieu Othacehe <m.othacehe@gmail.com>");
> MODULE_DESCRIPTION("Vishay VCNL4000 proximity/ambient light sensor driver");
> MODULE_LICENSE("GPL");

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