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staging:iio:accel:sca3000 Add write support to the low pass filter control 

Also includes an available attribute.  The ordering of values appears
a bit random, but as the ABI doesn't specify this and we already have
both rising and falling lists I think this is fine.

Signed-off-by: Jonathan Cameron <jic23@kernel.org>
Reviewed-by: Lars-Peter Clausen <lars@metafoo.de>
hifive-unleashed-5.1
Jonathan Cameron 2016-10-08 17:39:12 +01:00
parent 74bdc94075
commit 626f971b5b
1 changed files with 55 additions and 0 deletions
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55
drivers/staging/iio/accel/sca3000.c
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@ -433,6 +433,26 @@ error_ret:
return ret ? ret : len;
}
static ssize_t
sca3000_show_available_3db_freqs(struct device *dev,
struct device_attribute *attr,
char *buf)
{
struct iio_dev *indio_dev = dev_to_iio_dev(dev);
struct sca3000_state *st = iio_priv(indio_dev);
int len;
len = sprintf(buf, "%d", st->info->measurement_mode_3db_freq);
if (st->info->option_mode_1)
len += sprintf(buf + len, " %d",
st->info->option_mode_1_3db_freq);
if (st->info->option_mode_2)
len += sprintf(buf + len, " %d",
st->info->option_mode_2_3db_freq);
len += sprintf(buf + len, "\n");
return len;
}
/**
* sca3000_show_available_measurement_modes() display available modes
*
@ -571,6 +591,9 @@ static IIO_DEVICE_ATTR(measurement_mode, S_IRUGO | S_IWUSR,
sca3000_store_measurement_mode,
0);
static IIO_DEVICE_ATTR(in_accel_filter_low_pass_3db_frequency_available,
S_IRUGO, sca3000_show_available_3db_freqs,
NULL, 0);
/* More standard attributes */
static IIO_DEVICE_ATTR(revision, S_IRUGO, sca3000_show_rev, NULL, 0);
@ -779,6 +802,31 @@ static int sca3000_read_3db_freq(struct sca3000_state *st, int *val)
}
}
static int sca3000_write_3db_freq(struct sca3000_state *st, int val)
{
int ret;
int mode;
if (val == st->info->measurement_mode_3db_freq)
mode = SCA3000_REG_MODE_MEAS_MODE_NORMAL;
else if (st->info->option_mode_1 &&
(val == st->info->option_mode_1_3db_freq))
mode = SCA3000_REG_MODE_MEAS_MODE_OP_1;
else if (st->info->option_mode_2 &&
(val == st->info->option_mode_2_3db_freq))
mode = SCA3000_REG_MODE_MEAS_MODE_OP_2;
else
return -EINVAL;
ret = sca3000_read_data_short(st, SCA3000_REG_MODE_ADDR, 1);
if (ret)
return ret;
st->rx[0] &= ~SCA3000_REG_MODE_MODE_MASK;
st->rx[0] |= (mode & SCA3000_REG_MODE_MODE_MASK);
return sca3000_write_reg(st, SCA3000_REG_MODE_ADDR, st->rx[0]);
}
static int sca3000_read_raw(struct iio_dev *indio_dev,
struct iio_chan_spec const *chan,
int *val,
@ -861,6 +909,12 @@ static int sca3000_write_raw(struct iio_dev *indio_dev,
ret = write_raw_samp_freq(st, val);
mutex_unlock(&st->lock);
return ret;
case IIO_CHAN_INFO_LOW_PASS_FILTER_3DB_FREQUENCY:
if (val2)
return -EINVAL;
mutex_lock(&st->lock);
ret = sca3000_write_3db_freq(st, val);
mutex_unlock(&st->lock);
default:
return -EINVAL;
}
@ -1007,6 +1061,7 @@ static struct attribute *sca3000_attributes[] = {
&iio_dev_attr_revision.dev_attr.attr,
&iio_dev_attr_measurement_mode_available.dev_attr.attr,
&iio_dev_attr_measurement_mode.dev_attr.attr,
&iio_dev_attr_in_accel_filter_low_pass_3db_frequency_available.dev_attr.attr,
&iio_dev_attr_sampling_frequency_available.dev_attr.attr,
NULL,
};