linux-kernel - Re: [PATCH v4 2/4] iio: vcnl4000: Add event support for VCNL4010/20.

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Date:   Sat, 25 Apr 2020 20:47:04 +0100
From:   Jonathan Cameron <jic23@...nel.org>
To:     Mathieu Othacehe <m.othacehe@...il.com>
Cc:     knaack.h@....de, lars@...afoo.de, pmeerw@...erw.net,
        linux-iio@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v4 2/4] iio: vcnl4000: Add event support for
 VCNL4010/20.

On Tue, 21 Apr 2020 09:55:30 +0200
Mathieu Othacehe <m.othacehe@...il.com> wrote:

> The VCNL4010 and VCNL4020 chips are able to raise interrupts on proximity
> threshold events. Add support for threshold rising and falling events for
> those two chips.
> 
> Signed-off-by: Mathieu Othacehe <m.othacehe@...il.com>
> ---
...
> +
> +static const struct iio_chan_spec vcnl4010_channels[] = {
> +	{
> +		.type = IIO_LIGHT,
> +		.scan_index = -1,

Why introduce scan index here?  That's only used for buffers.

> +		.info_mask_separate = BIT(IIO_CHAN_INFO_RAW) |
> +			BIT(IIO_CHAN_INFO_SCALE),
> +	}, {
> +		.type = IIO_PROXIMITY,
> +		.scan_index = 0,
> +		.info_mask_separate = BIT(IIO_CHAN_INFO_RAW),
> +		.event_spec = vcnl4000_event_spec,
> +		.num_event_specs = ARRAY_SIZE(vcnl4000_event_spec),
> +		.ext_info = vcnl4000_ext_info,
> +	},
> +};
> +
>  static const struct iio_info vcnl4000_info = {
>  	.read_raw = vcnl4000_read_raw,
>  };
>  
> +static const struct iio_info vcnl4010_info = {
> +	.read_raw = vcnl4010_read_raw,
> +	.read_event_value = vcnl4010_read_event,
> +	.write_event_value = vcnl4010_write_event,
> +	.read_event_config = vcnl4010_read_event_config,
> +	.write_event_config = vcnl4010_write_event_config,
> +};
> +
> +static const struct vcnl4000_chip_spec vcnl4000_chip_spec_cfg[] = {
> +	[VCNL4000] = {
> +		.prod = "VCNL4000",
> +		.init = vcnl4000_init,
> +		.measure_light = vcnl4000_measure_light,
> +		.measure_proximity = vcnl4000_measure_proximity,
> +		.set_power_state = vcnl4000_set_power_state,
> +		.channels = vcnl4000_channels,
> +		.num_channels = ARRAY_SIZE(vcnl4000_channels),
> +		.info = &vcnl4000_info,
> +		.irq_support = false,
> +	},
> +	[VCNL4010] = {
> +		.prod = "VCNL4010/4020",
> +		.init = vcnl4000_init,
> +		.measure_light = vcnl4000_measure_light,
> +		.measure_proximity = vcnl4000_measure_proximity,
> +		.set_power_state = vcnl4000_set_power_state,
> +		.channels = vcnl4010_channels,
> +		.num_channels = ARRAY_SIZE(vcnl4010_channels),
> +		.info = &vcnl4010_info,
> +		.irq_support = true,
> +	},
> +	[VCNL4040] = {
> +		.prod = "VCNL4040",
> +		.init = vcnl4200_init,
> +		.measure_light = vcnl4200_measure_light,
> +		.measure_proximity = vcnl4200_measure_proximity,
> +		.set_power_state = vcnl4200_set_power_state,
> +		.channels = vcnl4000_channels,
> +		.num_channels = ARRAY_SIZE(vcnl4000_channels),
> +		.info = &vcnl4000_info,
> +		.irq_support = false,
> +	},
> +	[VCNL4200] = {
> +		.prod = "VCNL4200",
> +		.init = vcnl4200_init,
> +		.measure_light = vcnl4200_measure_light,
> +		.measure_proximity = vcnl4200_measure_proximity,
> +		.set_power_state = vcnl4200_set_power_state,
> +		.channels = vcnl4000_channels,
> +		.num_channels = ARRAY_SIZE(vcnl4000_channels),
> +		.info = &vcnl4000_info,
> +		.irq_support = false,
> +	},
> +};
> +
> +static irqreturn_t vcnl4010_irq_thread(int irq, void *p)
> +{
> +	struct iio_dev *indio_dev = p;
> +	struct vcnl4000_data *data = iio_priv(indio_dev);
> +	unsigned long isr;
> +	int ret;
> +
> +	ret = i2c_smbus_read_byte_data(data->client, VCNL4010_ISR);
> +	if (ret < 0)
> +		goto end;
> +
> +	isr = ret;
> +
> +	if (isr & VCNL4010_INT_THR) {
> +		if (test_bit(VCNL4010_INT_THR_LOW, &isr)) {
> +			iio_push_event(indio_dev,
> +				       IIO_UNMOD_EVENT_CODE(
> +					       IIO_PROXIMITY,
> +					       1,
> +					       IIO_EV_TYPE_THRESH,
> +					       IIO_EV_DIR_FALLING),
> +				       iio_get_time_ns(indio_dev));
> +		}
> +
> +		if (test_bit(VCNL4010_INT_THR_HIGH, &isr)) {
> +			iio_push_event(indio_dev,
> +				       IIO_UNMOD_EVENT_CODE(
> +					       IIO_PROXIMITY,
> +					       1,
> +					       IIO_EV_TYPE_THRESH,
> +					       IIO_EV_DIR_RISING),
> +				       iio_get_time_ns(indio_dev));
> +		}
> +
> +		i2c_smbus_write_byte_data(data->client, VCNL4010_ISR,
> +					  isr & VCNL4010_INT_THR);
> +	}
> +
> +end:
> +	return IRQ_HANDLED;
> +}
> +
>  static int vcnl4000_probe(struct i2c_client *client,
>  			  const struct i2c_device_id *id)
>  {
> @@ -486,12 +805,25 @@ static int vcnl4000_probe(struct i2c_client *client,
>  		data->near_level = 0;
>  
>  	indio_dev->dev.parent = &client->dev;
> -	indio_dev->info = &vcnl4000_info;
> -	indio_dev->channels = vcnl4000_channels;
> -	indio_dev->num_channels = ARRAY_SIZE(vcnl4000_channels);
> +	indio_dev->info = data->chip_spec->info;
> +	indio_dev->channels = data->chip_spec->channels;
> +	indio_dev->num_channels = data->chip_spec->num_channels;
>  	indio_dev->name = VCNL4000_DRV_NAME;
>  	indio_dev->modes = INDIO_DIRECT_MODE;
>  
> +	if (client->irq && data->chip_spec->irq_support) {
> +		ret = devm_request_threaded_irq(&client->dev, client->irq,
> +						NULL, vcnl4010_irq_thread,
> +						IRQF_TRIGGER_FALLING |
> +						IRQF_ONESHOT,
> +						"vcnl4010_irq",
> +						indio_dev);
> +		if (ret < 0) {
> +			dev_err(&client->dev, "irq request failed\n");
> +			return ret;
> +		}
> +	}
> +
>  	ret = pm_runtime_set_active(&client->dev);
>  	if (ret < 0)
>  		goto fail_poweroff;