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iio: sx9310: Support setting proximity thresholds

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Add support to set the proximity thresholds for each channel.

Signed-off-by: Stephen Boyd <swboyd@chromium.org>
Cc: Daniel Campello <campello@chromium.org>
Cc: Lars-Peter Clausen <lars@metafoo.de>
Cc: Peter Meerwald-Stadler <pmeerw@pmeerw.net>
Cc: Douglas Anderson <dianders@chromium.org>
Cc: Gwendal Grignou <gwendal@chromium.org>
Cc: Evan Green <evgreen@chromium.org>
Link: https://lore.kernel.org/r/20201007011735.1346994-3-swboyd@chromium.org
Signed-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>
This commit is contained in:
Stephen Boyd 2020-10-06 18:17:31 -07:00 committed by Jonathan Cameron
parent 227c83faa2
commit ad2b473e2b
1 changed files with 114 additions and 0 deletions
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114
drivers/iio/proximity/sx9310.c
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@ -68,6 +68,7 @@
#define SX9310_REG_PROX_CTRL7_AVGNEGFILT_2 (0x01 << 3)
#define SX9310_REG_PROX_CTRL7_AVGPOSFILT_512 0x05
#define SX9310_REG_PROX_CTRL8 0x18
#define SX9310_REG_PROX_CTRL8_9_PTHRESH_MASK GENMASK(7, 3)
#define SX9310_REG_PROX_CTRL9 0x19
#define SX9310_REG_PROX_CTRL8_9_PTHRESH_28 (0x08 << 3)
#define SX9310_REG_PROX_CTRL8_9_PTHRESH_96 (0x11 << 3)
@ -531,6 +532,117 @@ static int sx9310_read_avail(struct iio_dev *indio_dev,
return -EINVAL;
}
static const unsigned int sx9310_pthresh_codes[] = {
2, 4, 6, 8, 12, 16, 20, 24, 28, 32, 40, 48, 56, 64, 72, 80, 88, 96, 112,
128, 144, 160, 192, 224, 256, 320, 384, 512, 640, 768, 1024, 1536
};
static int sx9310_get_thresh_reg(unsigned int channel)
{
switch (channel) {
case 0:
case 3:
return SX9310_REG_PROX_CTRL8;
case 1:
case 2:
return SX9310_REG_PROX_CTRL9;
}
return -EINVAL;
}
static int sx9310_read_thresh(struct sx9310_data *data,
const struct iio_chan_spec *chan, int *val)
{
unsigned int reg;
unsigned int regval;
int ret;
reg = ret = sx9310_get_thresh_reg(chan->channel);
if (ret < 0)
return ret;
ret = regmap_read(data->regmap, reg, &regval);
if (ret)
return ret;
regval = FIELD_GET(SX9310_REG_PROX_CTRL8_9_PTHRESH_MASK, regval);
if (regval > ARRAY_SIZE(sx9310_pthresh_codes))
return -EINVAL;
*val = sx9310_pthresh_codes[regval];
return IIO_VAL_INT;
}
static int sx9310_read_event_val(struct iio_dev *indio_dev,
const struct iio_chan_spec *chan,
enum iio_event_type type,
enum iio_event_direction dir,
enum iio_event_info info, int *val, int *val2)
{
struct sx9310_data *data = iio_priv(indio_dev);
if (chan->type != IIO_PROXIMITY)
return -EINVAL;
switch (info) {
case IIO_EV_INFO_VALUE:
return sx9310_read_thresh(data, chan, val);
default:
return -EINVAL;
}
}
static int sx9310_write_thresh(struct sx9310_data *data,
const struct iio_chan_spec *chan, int val)
{
unsigned int reg;
unsigned int regval;
int ret, i;
reg = ret = sx9310_get_thresh_reg(chan->channel);
if (ret < 0)
return ret;
for (i = 0; i < ARRAY_SIZE(sx9310_pthresh_codes); i++) {
if (sx9310_pthresh_codes[i] == val) {
regval = i;
break;
}
}
if (i == ARRAY_SIZE(sx9310_pthresh_codes))
return -EINVAL;
regval = FIELD_PREP(SX9310_REG_PROX_CTRL8_9_PTHRESH_MASK, regval);
mutex_lock(&data->mutex);
ret = regmap_update_bits(data->regmap, reg,
SX9310_REG_PROX_CTRL8_9_PTHRESH_MASK, regval);
mutex_unlock(&data->mutex);
return ret;
}
static int sx9310_write_event_val(struct iio_dev *indio_dev,
const struct iio_chan_spec *chan,
enum iio_event_type type,
enum iio_event_direction dir,
enum iio_event_info info, int val, int val2)
{
struct sx9310_data *data = iio_priv(indio_dev);
if (chan->type != IIO_PROXIMITY)
return -EINVAL;
switch (info) {
case IIO_EV_INFO_VALUE:
return sx9310_write_thresh(data, chan, val);
default:
return -EINVAL;
}
}
static int sx9310_set_samp_freq(struct sx9310_data *data, int val, int val2)
{
int i, ret;
@ -744,6 +856,8 @@ static const struct iio_info sx9310_info = {
.attrs = &sx9310_attribute_group,
.read_raw = sx9310_read_raw,
.read_avail = sx9310_read_avail,
.read_event_value = sx9310_read_event_val,
.write_event_value = sx9310_write_event_val,
.write_raw = sx9310_write_raw,
.read_event_config = sx9310_read_event_config,
.write_event_config = sx9310_write_event_config,