From 227c83faa2f83293e88e7889eaab6fc7960ecee3 Mon Sep 17 00:00:00 2001 From: Stephen Boyd Date: Tue, 6 Oct 2020 18:17:30 -0700 Subject: [PATCH] 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 Cc: Daniel Campello Cc: Lars-Peter Clausen Cc: Peter Meerwald-Stadler Cc: Douglas Anderson Cc: Gwendal Grignou Cc: Evan Green Link: https://lore.kernel.org/r/20201007011735.1346994-2-swboyd@chromium.org Signed-off-by: Jonathan Cameron --- drivers/iio/proximity/sx9310.c | 109 +++++++++++++++++++++++++++++++-- 1 file changed, 104 insertions(+), 5 deletions(-) diff --git a/drivers/iio/proximity/sx9310.c b/drivers/iio/proximity/sx9310.c index 6d3f4ab8c6b2..68a39c11c7bf 100644 --- a/drivers/iio/proximity/sx9310.c +++ b/drivers/iio/proximity/sx9310.c @@ -16,6 +16,7 @@ #include #include #include +#include #include #include #include @@ -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 @@ out: 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, ®val); + 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,