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Date: Mon, 15 May 2023 17:00:21 +0200
From: Astrid Rost <astridr@...s.com>
To: Jonathan Cameron <jic23@...nel.org>,
Astrid Rost <astrid.rost@...s.com>
CC: Lars-Peter Clausen <lars@...afoo.de>, <linux-iio@...r.kernel.org>,
<linux-kernel@...r.kernel.org>, <kernel@...s.com>
Subject: Re: [PATCH v2 5/7] iio: light: vcnl4000: Add debounce count for
vcnl4040/4200
Hello Jonathan,
Thank you!
I will use period instead, but this means it is dependent on integration
time as well.
Maybe I should try to deliver the first four matching patches and make
another delivery of the last three.
Astrid
On 5/14/23 19:37, Jonathan Cameron wrote:
> On Tue, 9 May 2023 16:01:51 +0200
> Astrid Rost <astrid.rost@...s.com> wrote:
>
>> Add read/write attribute for proximity and illumination debounce-count
>> and read attribute for available debounce-counts.
>> The debounce-count is set in the interrupt persistence flags
>> (PS_PERS and ALS_PERS). An interrupt will not be asserted if the raw
>> value is not over (or lower) than the threshold for the set
>> continued refresh times.
>> This is supported for vcnl4040 vcnl4200.
>
> Why debounce count? That has previously just been used for step detection
> on accelerometers and has a pretty specific definition in
> See Documentation/ABI/testing/sysfs-bus-iio
>
> "
> What: /sys/.../iio:deviceX/in_steps_debounce_count
> ...
> Specifies the number of steps that must occur within
> in_steps_filter_debounce_time for the pedometer to decide the
> consumer is making steps.
> "
>
> What you probably want is period, though that is defined in seconds so
> you may need some unit conversions. That is defined for events, not for
> a channel so IIO_EV_INFO_PERIOD.
> "
> Period of time (in seconds) for which the condition must be
> met before an event is generated. If direction is not
> specified then this period applies to both directions.
> "
>
>>
>> Signed-off-by: Astrid Rost <astrid.rost@...s.com>
>> ---
>> drivers/iio/light/vcnl4000.c | 156 ++++++++++++++++++++++++++++++++++-
>> 1 file changed, 152 insertions(+), 4 deletions(-)
>>
>> diff --git a/drivers/iio/light/vcnl4000.c b/drivers/iio/light/vcnl4000.c
>> index 68eea686b2dc..b8ce4ed6b0bb 100644
>> --- a/drivers/iio/light/vcnl4000.c
>> +++ b/drivers/iio/light/vcnl4000.c
>> @@ -84,8 +84,10 @@
>> #define VCNL4040_ALS_CONF_ALS_SHUTDOWN BIT(0)
>> #define VCNL4040_ALS_CONF_IT GENMASK(7, 6) /* Ambient integration time */
>> #define VCNL4040_ALS_CONF_INT_EN BIT(1) /* Ambient light Interrupt enable */
>> +#define VCNL4040_ALS_CONF_PERS GENMASK(3, 2) /* Ambient interrupt persistence setting */
>> #define VCNL4040_PS_CONF1_PS_SHUTDOWN BIT(0)
>> #define VCNL4040_PS_CONF2_PS_IT GENMASK(3, 1) /* Proximity integration time */
>> +#define VCNL4040_CONF1_PS_PERS GENMASK(5, 4) /* Proximity interrupt persistence setting */
>> #define VCNL4040_PS_CONF2_PS_INT GENMASK(9, 8) /* Proximity interrupt mode */
>> #define VCNL4040_PS_IF_AWAY BIT(8) /* Proximity event cross low threshold */
>> #define VCNL4040_PS_IF_CLOSE BIT(9) /* Proximity event cross high threshold */
>> @@ -153,6 +155,9 @@ static const int vcnl4200_als_it_times[][2] = {
>> {0, 400000},
>> };
>>
>> +static const int vcnl4040_als_debounce_count[] = {1, 2, 4, 8};
>> +static const int vcnl4040_ps_debounce_count[] = {1, 2, 3, 4};
>> +
>> #define VCNL4000_SLEEP_DELAY_MS 2000 /* before we enter pm_runtime_suspend */
>>
>> enum vcnl4000_device_ids {
>> @@ -680,6 +685,106 @@ static ssize_t vcnl4040_write_ps_it(struct vcnl4000_data *data, int val)
>> return ret;
>> }
>>
>> +static ssize_t vcnl4040_read_als_debounce_count(struct vcnl4000_data *data, int *val)
>> +{
>> + int ret;
>> +
>> + ret = i2c_smbus_read_word_data(data->client, VCNL4200_AL_CONF);
>> + if (ret < 0)
>> + return ret;
>> +
>> + ret = FIELD_GET(VCNL4040_ALS_CONF_PERS, ret);
>> +
>> + if (ret >= ARRAY_SIZE(vcnl4200_als_it_times))
>> + return -EINVAL;
>> +
>> + *val = vcnl4040_als_debounce_count[ret];
>> +
>> + return ret;
>> +}
>> +
>> +static ssize_t vcnl4040_write_als_debounce_count(struct vcnl4000_data *data, int val)
>> +{
>> + unsigned int i;
>> + int ret, index = -1;
>> + u16 regval;
>> +
>> + for (i = 0; i < ARRAY_SIZE(vcnl4040_als_debounce_count); i++) {
>> + if (val == vcnl4040_als_debounce_count[i]) {
>> + index = i;
>> + break;
>> + }
>> + }
>> +
>> + if (index < 0)
>> + return -EINVAL;
>> +
>> + mutex_lock(&data->vcnl4000_lock);
>> +
>> + ret = i2c_smbus_read_word_data(data->client, VCNL4200_AL_CONF);
>> + if (ret < 0)
>> + goto out;
>> +
>> + regval = (ret & ~VCNL4040_ALS_CONF_PERS) |
>> + FIELD_PREP(VCNL4040_ALS_CONF_PERS, index);
>> + ret = i2c_smbus_write_word_data(data->client, VCNL4200_AL_CONF,
>> + regval);
>> +
>> +out:
>> + mutex_unlock(&data->vcnl4000_lock);
>> + return ret;
>> +}
>> +
>> +static ssize_t vcnl4040_read_ps_debounce_count(struct vcnl4000_data *data, int *val)
>> +{
>> + int ret;
>> +
>> + ret = i2c_smbus_read_word_data(data->client, VCNL4200_PS_CONF1);
>> + if (ret < 0)
>> + return ret;
>> +
>> + ret = FIELD_GET(VCNL4040_CONF1_PS_PERS, ret);
>> +
>> + if (ret >= ARRAY_SIZE(vcnl4200_ps_it_times))
>> + return -EINVAL;
>> +
>> + *val = vcnl4040_ps_debounce_count[ret];
>> +
>> + return ret;
>> +}
>> +
>> +static ssize_t vcnl4040_write_ps_debounce_count(struct vcnl4000_data *data, int val)
>> +{
>> + unsigned int i;
>> + int ret, index = -1;
>> + u16 regval;
>> +
>> + for (i = 0; i < ARRAY_SIZE(vcnl4040_ps_debounce_count); i++) {
>> + if (val == vcnl4040_ps_debounce_count[i]) {
>> + index = i;
>> + break;
>> + }
>> + }
>> +
>> + if (index < 0)
>> + return -EINVAL;
>> +
>> + mutex_lock(&data->vcnl4000_lock);
>> +
>> + ret = i2c_smbus_read_word_data(data->client, VCNL4200_PS_CONF1);
>> + if (ret < 0)
>> + goto out;
>> +
>> + regval = (ret & ~VCNL4040_CONF1_PS_PERS) |
>> + FIELD_PREP(VCNL4040_CONF1_PS_PERS, index);
>> + ret = i2c_smbus_write_word_data(data->client, VCNL4200_PS_CONF1,
>> + regval);
>> +
>> +out:
>> + mutex_unlock(&data->vcnl4000_lock);
>> + return ret;
>> +}
>> +
>> static int vcnl4000_read_raw(struct iio_dev *indio_dev,
>> struct iio_chan_spec const *chan,
>> int *val, int *val2, long mask)
>> @@ -730,6 +835,21 @@ static int vcnl4000_read_raw(struct iio_dev *indio_dev,
>> if (ret < 0)
>> return ret;
>> return IIO_VAL_INT_PLUS_MICRO;
>> + case IIO_CHAN_INFO_DEBOUNCE_COUNT:
>> + switch (chan->type) {
>> + case IIO_LIGHT:
>> + ret = vcnl4040_read_als_debounce_count(data, val);
>> + break;
>> + case IIO_PROXIMITY:
>> + ret = vcnl4040_read_ps_debounce_count(data, val);
>> + break;
>> + default:
>> + return -EINVAL;
>> + }
>> + if (ret < 0)
>> + return ret;
>> + return IIO_VAL_INT;
>> +
>> default:
>> return -EINVAL;
>> }
>> @@ -753,6 +873,15 @@ static int vcnl4040_write_raw(struct iio_dev *indio_dev,
>> default:
>> return -EINVAL;
>> }
>> + case IIO_CHAN_INFO_DEBOUNCE_COUNT:
>> + switch (chan->type) {
>> + case IIO_LIGHT:
>> + return vcnl4040_write_als_debounce_count(data, val);
>> + case IIO_PROXIMITY:
>> + return vcnl4040_write_ps_debounce_count(data, val);
>> + default:
>> + return -EINVAL;
>> + }
>> default:
>> return -EINVAL;
>> }
>> @@ -791,6 +920,21 @@ static int vcnl4040_read_avail(struct iio_dev *indio_dev,
>> }
>> *type = IIO_VAL_INT_PLUS_MICRO;
>> return IIO_AVAIL_LIST;
>> + case IIO_CHAN_INFO_DEBOUNCE_COUNT:
>> + switch (chan->type) {
>> + case IIO_LIGHT:
>> + *vals = (int *)vcnl4040_als_debounce_count;
>> + *length = ARRAY_SIZE(vcnl4040_als_debounce_count);
>> + break;
>> + case IIO_PROXIMITY:
>> + *vals = (int *)vcnl4040_ps_debounce_count;
>> + *length = ARRAY_SIZE(vcnl4040_ps_debounce_count);
>> + break;
>> + default:
>> + return -EINVAL;
>> + }
>> + *type = IIO_VAL_INT;
>> + return IIO_AVAIL_LIST;
>> default:
>> return -EINVAL;
>> }
>> @@ -1504,15 +1648,19 @@ static const struct iio_chan_spec vcnl4040_channels[] = {
>> .type = IIO_LIGHT,
>> .info_mask_separate = BIT(IIO_CHAN_INFO_RAW) |
>> BIT(IIO_CHAN_INFO_SCALE) |
>> - BIT(IIO_CHAN_INFO_INT_TIME),
>> - .info_mask_separate_available = BIT(IIO_CHAN_INFO_INT_TIME),
>> + BIT(IIO_CHAN_INFO_INT_TIME) |
>> + BIT(IIO_CHAN_INFO_DEBOUNCE_COUNT),
>> + .info_mask_separate_available = BIT(IIO_CHAN_INFO_INT_TIME) |
>> + BIT(IIO_CHAN_INFO_DEBOUNCE_COUNT),
>> .event_spec = vcnl4000_event_spec,
>> .num_event_specs = ARRAY_SIZE(vcnl4000_event_spec),
>> }, {
>> .type = IIO_PROXIMITY,
>> .info_mask_separate = BIT(IIO_CHAN_INFO_RAW) |
>> - BIT(IIO_CHAN_INFO_INT_TIME),
>> - .info_mask_separate_available = BIT(IIO_CHAN_INFO_INT_TIME),
>> + BIT(IIO_CHAN_INFO_INT_TIME) |
>> + BIT(IIO_CHAN_INFO_DEBOUNCE_COUNT),
>> + .info_mask_separate_available = BIT(IIO_CHAN_INFO_INT_TIME) |
>> + BIT(IIO_CHAN_INFO_DEBOUNCE_COUNT),
>> .ext_info = vcnl4000_ext_info,
>> .event_spec = vcnl4040_event_spec,
>> .num_event_specs = ARRAY_SIZE(vcnl4040_event_spec),
>
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