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iio: light: vcnl4000: update sampling periods for vcnl4200

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[ Upstream commit b42aa97ed5f1169cfd37175ef388ea62ff2dcf43 ]

Vishay has published a new version of "Designing the VCNL4200 Into an
Application" application note in October 2019. The new version specifies
that there is +-20% of part to part tolerance. This explains the drift
seen during experiments. The proximity pulse width is also changed from
32us to 30us. According to the support, the tolerance also applies to
ambient light.

So update the sampling periods. As the reading is blocking, current
users may notice slightly longer response time.

Fixes: be38866fbb ("iio: vcnl4000: add support for VCNL4200")
Reviewed-by: Guido Günther <agx@sigxcpu.org>
Signed-off-by: Tomas Novotny <tomas@novotny.cz>
Cc: <Stable@vger.kernel.org>
Signed-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>
This commit is contained in:
Tomas Novotny 2020-02-18 16:44:50 +01:00 committed by Greg Kroah-Hartman
parent 72d3dd250a
commit 3b2c4f1122
1 changed files with 4 additions and 3 deletions
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7
drivers/iio/light/vcnl4000.c
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@ -150,9 +150,10 @@ static int vcnl4200_init(struct vcnl4000_data *data)
data->al_scale = 24000; data->al_scale = 24000;
data->vcnl4200_al.reg = VCNL4200_AL_DATA; data->vcnl4200_al.reg = VCNL4200_AL_DATA;
data->vcnl4200_ps.reg = VCNL4200_PS_DATA; data->vcnl4200_ps.reg = VCNL4200_PS_DATA;
/* Integration time is 50ms, but the experiments show 54ms in total. */ /* Default wait time is 50ms, add 20% tolerance. */
data->vcnl4200_al.sampling_rate = ktime_set(0, 54000 * 1000); data->vcnl4200_al.sampling_rate = ktime_set(0, 60000 * 1000);
data->vcnl4200_ps.sampling_rate = ktime_set(0, 4200 * 1000); /* Default wait time is 4.8ms, add 20% tolerance. */
data->vcnl4200_ps.sampling_rate = ktime_set(0, 5760 * 1000);
data->vcnl4200_al.last_measurement = ktime_set(0, 0); data->vcnl4200_al.last_measurement = ktime_set(0, 0);
data->vcnl4200_ps.last_measurement = ktime_set(0, 0); data->vcnl4200_ps.last_measurement = ktime_set(0, 0);
mutex_init(&data->vcnl4200_al.lock); mutex_init(&data->vcnl4200_al.lock);