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iio: sx9310: Support hardware gain factor 

Add support to set the hardware gain of the channels as a multiplier of
2x, 4x, or 8x.

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/20201007011735.1346994-2-swboyd@chromium.org
Signed-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>
This commit is contained in:
Stephen Boyd 2020-10-06 18:17:30 -07:00 committed by Jonathan Cameron
parent 324b9f2987
commit 227c83faa2
1 changed files with 104 additions and 5 deletions
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109
drivers/iio/proximity/sx9310.c
View File

@ -16,6 +16,7 @@
#include <linux/i2c.h>
#include <linux/irq.h>
#include <linux/kernel.h>
#include <linux/log2.h>
#include <linux/mod_devicetable.h>
#include <linux/module.h>
#include <linux/pm.h>
@ -51,7 +52,9 @@
#define SX9310_REG_PROX_CTRL2_COMBMODE_CS1_CS2 (0x02 << 6)
#define SX9310_REG_PROX_CTRL2_SHIELDEN_DYNAMIC (0x01 << 2)
#define SX9310_REG_PROX_CTRL3 0x13
#define SX9310_REG_PROX_CTRL3_GAIN0_MASK GENMASK(3, 2)
#define SX9310_REG_PROX_CTRL3_GAIN0_X8 (0x03 << 2)
#define SX9310_REG_PROX_CTRL3_GAIN12_MASK GENMASK(1, 0)
#define SX9310_REG_PROX_CTRL3_GAIN12_X4 0x02
#define SX9310_REG_PROX_CTRL4 0x14
#define SX9310_REG_PROX_CTRL4_RESOLUTION_FINEST 0x07
@ -145,15 +148,18 @@ static const struct iio_event_spec sx9310_events[] = {
{
.type = IIO_EV_TYPE_THRESH,
.dir = IIO_EV_DIR_EITHER,
.mask_separate = BIT(IIO_EV_INFO_ENABLE),
.mask_separate = BIT(IIO_EV_INFO_ENABLE) | BIT(IIO_EV_INFO_VALUE),
},
};
#define SX9310_NAMED_CHANNEL(idx, name) \
{ \
.type = IIO_PROXIMITY, \
.info_mask_separate = BIT(IIO_CHAN_INFO_RAW), \
.info_mask_separate = BIT(IIO_CHAN_INFO_RAW) | \
BIT(IIO_CHAN_INFO_HARDWAREGAIN), \
.info_mask_shared_by_all = BIT(IIO_CHAN_INFO_SAMP_FREQ), \
.info_mask_separate_available = \
BIT(IIO_CHAN_INFO_HARDWAREGAIN), \
.indexed = 1, \
.channel = idx, \
.extend_name = name, \
@ -426,6 +432,34 @@ static int sx9310_read_proximity(struct sx9310_data *data,
return ret;
}
static int sx9310_read_gain(struct sx9310_data *data,
const struct iio_chan_spec *chan, int *val)
{
unsigned int regval, gain;
int ret;
ret = regmap_read(data->regmap, SX9310_REG_PROX_CTRL3, &regval);
if (ret)
return ret;
switch (chan->channel) {
case 0:
case 3:
gain = FIELD_GET(SX9310_REG_PROX_CTRL3_GAIN0_MASK, regval);
break;
case 1:
case 2:
gain = FIELD_GET(SX9310_REG_PROX_CTRL3_GAIN12_MASK, regval);
break;
default:
return -EINVAL;
}
*val = 1 << gain;
return IIO_VAL_INT;
}
static int sx9310_read_samp_freq(struct sx9310_data *data, int *val, int *val2)
{
unsigned int regval;
@ -461,6 +495,14 @@ static int sx9310_read_raw(struct iio_dev *indio_dev,
ret = sx9310_read_proximity(data, chan, val);
iio_device_release_direct_mode(indio_dev);
return ret;
case IIO_CHAN_INFO_HARDWAREGAIN:
ret = iio_device_claim_direct_mode(indio_dev);
if (ret)
return ret;
ret = sx9310_read_gain(data, chan, val);
iio_device_release_direct_mode(indio_dev);
return ret;
case IIO_CHAN_INFO_SAMP_FREQ:
return sx9310_read_samp_freq(data, val, val2);
default:
@ -468,6 +510,27 @@ static int sx9310_read_raw(struct iio_dev *indio_dev,
}
}
static const int sx9310_gain_vals[] = { 1, 2, 4, 8 };
static int sx9310_read_avail(struct iio_dev *indio_dev,
struct iio_chan_spec const *chan,
const int **vals, int *type, int *length,
long mask)
{
if (chan->type != IIO_PROXIMITY)
return -EINVAL;
switch (mask) {
case IIO_CHAN_INFO_HARDWAREGAIN:
*type = IIO_VAL_INT;
*length = ARRAY_SIZE(sx9310_gain_vals);
*vals = sx9310_gain_vals;
return IIO_AVAIL_LIST;
}
return -EINVAL;
}
static int sx9310_set_samp_freq(struct sx9310_data *data, int val, int val2)
{
int i, ret;
@ -492,6 +555,37 @@ static int sx9310_set_samp_freq(struct sx9310_data *data, int val, int val2)
return ret;
}
static int sx9310_write_gain(struct sx9310_data *data,
const struct iio_chan_spec *chan, int val)
{
unsigned int gain, mask;
int ret;
gain = ilog2(val);
switch (chan->channel) {
case 0:
case 3:
mask = SX9310_REG_PROX_CTRL3_GAIN0_MASK;
gain = FIELD_PREP(SX9310_REG_PROX_CTRL3_GAIN0_MASK, gain);
break;
case 1:
case 2:
mask = SX9310_REG_PROX_CTRL3_GAIN12_MASK;
gain = FIELD_PREP(SX9310_REG_PROX_CTRL3_GAIN12_MASK, gain);
break;
default:
return -EINVAL;
}
mutex_lock(&data->mutex);
ret = regmap_update_bits(data->regmap, SX9310_REG_PROX_CTRL3, mask,
gain);
mutex_unlock(&data->mutex);
return ret;
}
static int sx9310_write_raw(struct iio_dev *indio_dev,
const struct iio_chan_spec *chan, int val, int val2,
long mask)
@ -501,10 +595,14 @@ static int sx9310_write_raw(struct iio_dev *indio_dev,
if (chan->type != IIO_PROXIMITY)
return -EINVAL;
if (mask != IIO_CHAN_INFO_SAMP_FREQ)
return -EINVAL;
switch (mask) {
case IIO_CHAN_INFO_SAMP_FREQ:
return sx9310_set_samp_freq(data, val, val2);
case IIO_CHAN_INFO_HARDWAREGAIN:
return sx9310_write_gain(data, chan, val);
}
return sx9310_set_samp_freq(data, val, val2);
return -EINVAL;
}
static irqreturn_t sx9310_irq_handler(int irq, void *private)
@ -645,6 +743,7 @@ static const struct attribute_group sx9310_attribute_group = {
static const struct iio_info sx9310_info = {
.attrs = &sx9310_attribute_group,
.read_raw = sx9310_read_raw,
.read_avail = sx9310_read_avail,
.write_raw = sx9310_write_raw,
.read_event_config = sx9310_read_event_config,
.write_event_config = sx9310_write_event_config,