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Message-ID: <20230514184449.72aa1ab8@jic23-huawei>
Date: Sun, 14 May 2023 18:44:49 +0100
From: Jonathan Cameron <jic23@...nel.org>
To: 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 7/7] iio: light: vcnl4000: Add calibration bias for
4040/4200
On Tue, 9 May 2023 16:01:53 +0200
Astrid Rost <astrid.rost@...s.com> wrote:
> The calibration bias is setting the LED current to change
> the detection distance.
> Add read/write attribute for proximity calibration bias and read
> attribute for available values.
> This is supported for vcnl4040 and vcnl4200.
Another interesting mapping onto standard ABI.
I guess it sort of ends up mapping to calibbias so I think I'm fine with this
one if other reviewers agree.
From a quick look (run out of time again today!) this looks fine to me.
Will take another look at v3.
Thanks,
Jonathan
>
> Signed-off-by: Astrid Rost <astrid.rost@...s.com>
> ---
> drivers/iio/light/vcnl4000.c | 97 ++++++++++++++++++++++++++++++++++--
> 1 file changed, 94 insertions(+), 3 deletions(-)
>
> diff --git a/drivers/iio/light/vcnl4000.c b/drivers/iio/light/vcnl4000.c
> index 1fd1eaaa4620..f0bf078dcdbe 100644
> --- a/drivers/iio/light/vcnl4000.c
> +++ b/drivers/iio/light/vcnl4000.c
> @@ -91,6 +91,7 @@
> #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_CONF3_MPS GENMASK(6, 5) /* Proximity multi pulse number */
> +#define VCNL4040_PS_MS_LED_I GENMASK(10, 8) /* Proximity current */
> #define VCNL4040_PS_IF_AWAY BIT(8) /* Proximity event cross low threshold */
> #define VCNL4040_PS_IF_CLOSE BIT(9) /* Proximity event cross high threshold */
> #define VCNL4040_ALS_RISING BIT(12) /* Ambient Light cross high threshold */
> @@ -157,6 +158,17 @@ static const int vcnl4200_als_it_times[][2] = {
> {0, 400000},
> };
>
> +static const int vcnl4040_ps_calibbias_ua[][2] = {
> + {0, 50000},
> + {0, 75000},
> + {0, 100000},
> + {0, 120000},
> + {0, 140000},
> + {0, 160000},
> + {0, 180000},
> + {0, 200000},
> +};
> +
> static const int vcnl4040_als_debounce_count[] = {1, 2, 4, 8};
> static const int vcnl4040_ps_debounce_count[] = {1, 2, 3, 4};
> static const int vcnl4040_ps_oversampling_ratio[] = {1, 2, 4, 8};
> @@ -838,6 +850,57 @@ static ssize_t vcnl4040_write_ps_oversampling_ratio(struct vcnl4000_data *data,
> return ret;
> }
>
> +static ssize_t vcnl4040_read_ps_calibbias(struct vcnl4000_data *data, int *val, int *val2)
> +{
> + int ret;
> +
> + ret = i2c_smbus_read_word_data(data->client, VCNL4200_PS_CONF3);
> + if (ret < 0)
> + return ret;
> +
> + ret = FIELD_GET(VCNL4040_PS_MS_LED_I, ret);
> +
> + if (ret >= ARRAY_SIZE(vcnl4040_ps_calibbias_ua))
> + return -EINVAL;
> +
> + *val = vcnl4040_ps_calibbias_ua[ret][0];
> + *val2 = vcnl4040_ps_calibbias_ua[ret][1];
> +
> + return ret;
> +}
> +
> +static ssize_t vcnl4040_write_ps_calibbias(struct vcnl4000_data *data, int val)
> +{
> + unsigned int i;
> + int ret, index = -1;
> + u16 regval;
> +
> + for (i = 0; i < ARRAY_SIZE(vcnl4040_ps_calibbias_ua); i++) {
> + if (val == vcnl4040_ps_calibbias_ua[i][1]) {
> + index = i;
> + break;
> + }
> + }
> +
> + if (index < 0)
> + return -EINVAL;
> +
> + mutex_lock(&data->vcnl4000_lock);
> +
> + ret = i2c_smbus_read_word_data(data->client, VCNL4200_PS_CONF3);
> + if (ret < 0)
> + goto out;
> +
> + regval = (ret & ~VCNL4040_PS_MS_LED_I) |
> + FIELD_PREP(VCNL4040_PS_MS_LED_I, index);
> + ret = i2c_smbus_write_word_data(data->client, VCNL4200_PS_CONF3,
> + 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)
> @@ -912,7 +975,16 @@ static int vcnl4000_read_raw(struct iio_dev *indio_dev,
> default:
> return -EINVAL;
> }
> -
> + case IIO_CHAN_INFO_CALIBBIAS:
> + switch (chan->type) {
> + case IIO_PROXIMITY:
> + ret = vcnl4040_read_ps_calibbias(data, val, val2);
> + if (ret < 0)
> + return ret;
> + return IIO_VAL_INT_PLUS_MICRO;
> + default:
> + return -EINVAL;
> + }
> default:
> return -EINVAL;
> }
> @@ -952,6 +1024,13 @@ static int vcnl4040_write_raw(struct iio_dev *indio_dev,
> default:
> return -EINVAL;
> }
> + case IIO_CHAN_INFO_CALIBBIAS:
> + switch (chan->type) {
> + case IIO_PROXIMITY:
> + return vcnl4040_write_ps_calibbias(data, val2);
> + default:
> + return -EINVAL;
> + }
> default:
> return -EINVAL;
> }
> @@ -1015,6 +1094,16 @@ static int vcnl4040_read_avail(struct iio_dev *indio_dev,
> default:
> return -EINVAL;
> }
> + case IIO_CHAN_INFO_CALIBBIAS:
> + switch (chan->type) {
> + case IIO_PROXIMITY:
> + *vals = (int *)vcnl4040_ps_calibbias_ua;
> + *length = 2 * ARRAY_SIZE(vcnl4040_ps_calibbias_ua);
> + *type = IIO_VAL_INT_PLUS_MICRO;
> + return IIO_AVAIL_LIST;
> + default:
> + return -EINVAL;
> + }
> default:
> return -EINVAL;
> }
> @@ -1739,10 +1828,12 @@ static const struct iio_chan_spec vcnl4040_channels[] = {
> .info_mask_separate = BIT(IIO_CHAN_INFO_RAW) |
> BIT(IIO_CHAN_INFO_INT_TIME) |
> BIT(IIO_CHAN_INFO_DEBOUNCE_COUNT) |
> - BIT(IIO_CHAN_INFO_OVERSAMPLING_RATIO),
> + BIT(IIO_CHAN_INFO_OVERSAMPLING_RATIO) |
> + BIT(IIO_CHAN_INFO_CALIBBIAS),
> .info_mask_separate_available = BIT(IIO_CHAN_INFO_INT_TIME) |
> BIT(IIO_CHAN_INFO_DEBOUNCE_COUNT) |
> - BIT(IIO_CHAN_INFO_OVERSAMPLING_RATIO),
> + BIT(IIO_CHAN_INFO_OVERSAMPLING_RATIO) |
> + BIT(IIO_CHAN_INFO_CALIBBIAS),
> .ext_info = vcnl4000_ext_info,
> .event_spec = vcnl4040_event_spec,
> .num_event_specs = ARRAY_SIZE(vcnl4040_event_spec),
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