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iio: mxs-lradc: fix divider

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All channels' single measurement are happening on CH 0. So enabling / disabling
the divider once is not enough, because it has impact on all channels.

Set only a flag, then check this on each measurement, and enable / disable the
divider as required.

Signed-off-by: Robert Hodaszi <robert.hodaszi@digi.com>
Cc: Stable@vger.kernel.org
Acked-by: Alexandre Belloni <alexandre.belloni@free-electrons.com>
Acked-by: Marek Vasut <marex@denx.de>
Signed-off-by: Jonathan Cameron <jic23@kernel.org>
This commit is contained in:
Robert Hodaszi 2014-10-06 14:41:00 +01:00 committed by Jonathan Cameron
parent 8ba42fb7b1
commit 19bc4981a2
1 changed files with 8 additions and 4 deletions
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12
drivers/staging/iio/adc/mxs-lradc.c
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@ -846,6 +846,14 @@ static int mxs_lradc_read_single(struct iio_dev *iio_dev, int chan, int *val)
LRADC_CTRL1);
mxs_lradc_reg_clear(lradc, 0xff, LRADC_CTRL0);
/* Enable / disable the divider per requirement */
if (test_bit(chan, &lradc->is_divided))
mxs_lradc_reg_set(lradc, 1 << LRADC_CTRL2_DIVIDE_BY_TWO_OFFSET,
LRADC_CTRL2);
else
mxs_lradc_reg_clear(lradc,
1 << LRADC_CTRL2_DIVIDE_BY_TWO_OFFSET, LRADC_CTRL2);
/* Clean the slot's previous content, then set new one. */
mxs_lradc_reg_clear(lradc, LRADC_CTRL4_LRADCSELECT_MASK(0),
LRADC_CTRL4);
@ -961,15 +969,11 @@ static int mxs_lradc_write_raw(struct iio_dev *iio_dev,
if (val == scale_avail[MXS_LRADC_DIV_DISABLED].integer &&
val2 == scale_avail[MXS_LRADC_DIV_DISABLED].nano) {
/* divider by two disabled */
writel(1 << LRADC_CTRL2_DIVIDE_BY_TWO_OFFSET,
lradc->base + LRADC_CTRL2 + STMP_OFFSET_REG_CLR);
clear_bit(chan->channel, &lradc->is_divided);
ret = 0;
} else if (val == scale_avail[MXS_LRADC_DIV_ENABLED].integer &&
val2 == scale_avail[MXS_LRADC_DIV_ENABLED].nano) {
/* divider by two enabled */
writel(1 << LRADC_CTRL2_DIVIDE_BY_TWO_OFFSET,
lradc->base + LRADC_CTRL2 + STMP_OFFSET_REG_SET);
set_bit(chan->channel, &lradc->is_divided);
ret = 0;
}