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staging:iio:accel:sca3000 add readback of the 3db low pass filter frequency 

Driving towards getting rid of the non standard mode control interface.

Signed-off-by: Jonathan Cameron <jic23@kernel.org>
Reviewed-by: Lars-Peter Clausen <lars@metafoo.de>
This commit is contained in:
Jonathan Cameron 2016-10-08 17:39:10 +01:00
parent 9bc11d32b3
commit 085fe1b2e3
1 changed files with 47 additions and 1 deletions
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48
drivers/staging/iio/accel/sca3000.c
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@ -191,10 +191,13 @@ struct sca3000_chip_info {
unsigned int scale;
bool temp_output;
int measurement_mode_freq;
int measurement_mode_3db_freq;
int option_mode_1;
int option_mode_1_freq;
int option_mode_1_3db_freq;
int option_mode_2;
int option_mode_2_freq;
int option_mode_2_3db_freq;
int mot_det_mult_xz[6];
int mot_det_mult_y[7];
};
@ -219,36 +222,46 @@ static const struct sca3000_chip_info sca3000_spi_chip_info_tbl[] = {
.scale = 7357,
.temp_output = true,
.measurement_mode_freq = 250,
.measurement_mode_3db_freq = 45,
.option_mode_1 = SCA3000_OP_MODE_BYPASS,
.option_mode_1_freq = 250,
.option_mode_1_3db_freq = 70,
.mot_det_mult_xz = {50, 100, 200, 350, 650, 1300},
.mot_det_mult_y = {50, 100, 150, 250, 450, 850, 1750},
},
[e02] = {
.scale = 9810,
.measurement_mode_freq = 125,
.measurement_mode_3db_freq = 40,
.option_mode_1 = SCA3000_OP_MODE_NARROW,
.option_mode_1_freq = 63,
.option_mode_1_3db_freq = 11,
.mot_det_mult_xz = {100, 150, 300, 550, 1050, 2050},
.mot_det_mult_y = {50, 100, 200, 350, 700, 1350, 2700},
},
[e04] = {
.scale = 19620,
.measurement_mode_freq = 100,
.measurement_mode_3db_freq = 38,
.option_mode_1 = SCA3000_OP_MODE_NARROW,
.option_mode_1_freq = 50,
.option_mode_1_3db_freq = 9,
.option_mode_2 = SCA3000_OP_MODE_WIDE,
.option_mode_2_freq = 400,
.option_mode_2_3db_freq = 70,
.mot_det_mult_xz = {200, 300, 600, 1100, 2100, 4100},
.mot_det_mult_y = {100, 200, 400, 7000, 1400, 2700, 54000},
},
[e05] = {
.scale = 61313,
.measurement_mode_freq = 200,
.measurement_mode_3db_freq = 60,
.option_mode_1 = SCA3000_OP_MODE_NARROW,
.option_mode_1_freq = 50,
.option_mode_1_3db_freq = 9,
.option_mode_2 = SCA3000_OP_MODE_WIDE,
.option_mode_2_freq = 400,
.option_mode_2_3db_freq = 75,
.mot_det_mult_xz = {600, 900, 1700, 3200, 6100, 11900},
.mot_det_mult_y = {300, 600, 1200, 2000, 4100, 7800, 15600},
},
@ -578,7 +591,8 @@ static const struct iio_event_spec sca3000_event = {
.modified = 1, \
.channel2 = mod, \
.info_mask_separate = BIT(IIO_CHAN_INFO_RAW), \
.info_mask_shared_by_type = BIT(IIO_CHAN_INFO_SCALE),\
.info_mask_shared_by_type = BIT(IIO_CHAN_INFO_SCALE) |\
BIT(IIO_CHAN_INFO_LOW_PASS_FILTER_3DB_FREQUENCY),\
.info_mask_shared_by_all = BIT(IIO_CHAN_INFO_SAMP_FREQ),\
.address = index, \
.scan_index = index, \
@ -738,6 +752,33 @@ static int write_raw_samp_freq(struct sca3000_state *st, int val)
ctrlval);
}
static int sca3000_read_3db_freq(struct sca3000_state *st, int *val)
{
int ret;
ret = sca3000_read_data_short(st, SCA3000_REG_MODE_ADDR, 1);
if (ret)
return ret;
/* mask bottom 2 bits - only ones that are relevant */
st->rx[0] &= SCA3000_REG_MODE_MODE_MASK;
switch (st->rx[0]) {
case SCA3000_REG_MODE_MEAS_MODE_NORMAL:
*val = st->info->measurement_mode_3db_freq;
return IIO_VAL_INT;
case SCA3000_REG_MODE_MEAS_MODE_MOT_DET:
return -EBUSY;
case SCA3000_REG_MODE_MEAS_MODE_OP_1:
*val = st->info->option_mode_1_3db_freq;
return IIO_VAL_INT;
case SCA3000_REG_MODE_MEAS_MODE_OP_2:
*val = st->info->option_mode_2_3db_freq;
return IIO_VAL_INT;
default:
return -EINVAL;
}
}
static int sca3000_read_raw(struct iio_dev *indio_dev,
struct iio_chan_spec const *chan,
int *val,
@ -795,6 +836,11 @@ static int sca3000_read_raw(struct iio_dev *indio_dev,
ret = read_raw_samp_freq(st, val);
mutex_unlock(&st->lock);
return ret ? ret : IIO_VAL_INT;
case IIO_CHAN_INFO_LOW_PASS_FILTER_3DB_FREQUENCY:
mutex_lock(&st->lock);
ret = sca3000_read_3db_freq(st, val);
mutex_unlock(&st->lock);
return ret;
default:
return -EINVAL;
}