diff options
Diffstat (limited to 'drivers/iio/adc/ad7791.c')
-rw-r--r-- | drivers/iio/adc/ad7791.c | 87 |
1 files changed, 47 insertions, 40 deletions
diff --git a/drivers/iio/adc/ad7791.c b/drivers/iio/adc/ad7791.c index 70fbf92f9827..a9ff0695ddf7 100644 --- a/drivers/iio/adc/ad7791.c +++ b/drivers/iio/adc/ad7791.c @@ -153,6 +153,17 @@ struct ad7791_state { const struct ad7791_chip_info *info; }; +static const int ad7791_sample_freq_avail[8][2] = { + [AD7791_FILTER_RATE_120] = { 120, 0 }, + [AD7791_FILTER_RATE_100] = { 100, 0 }, + [AD7791_FILTER_RATE_33_3] = { 33, 300000 }, + [AD7791_FILTER_RATE_20] = { 20, 0 }, + [AD7791_FILTER_RATE_16_6] = { 16, 600000 }, + [AD7791_FILTER_RATE_16_7] = { 16, 700000 }, + [AD7791_FILTER_RATE_13_3] = { 13, 300000 }, + [AD7791_FILTER_RATE_9_5] = { 9, 500000 }, +}; + static struct ad7791_state *ad_sigma_delta_to_ad7791(struct ad_sigma_delta *sd) { return container_of(sd, struct ad7791_state, sd); @@ -202,6 +213,7 @@ static int ad7791_read_raw(struct iio_dev *indio_dev, { struct ad7791_state *st = iio_priv(indio_dev); bool unipolar = !!(st->mode & AD7791_MODE_UNIPOLAR); + unsigned int rate; switch (info) { case IIO_CHAN_INFO_RAW: @@ -239,63 +251,56 @@ static int ad7791_read_raw(struct iio_dev *indio_dev, *val2 = chan->scan_type.realbits - 1; return IIO_VAL_FRACTIONAL_LOG2; + case IIO_CHAN_INFO_SAMP_FREQ: + rate = st->filter & AD7791_FILTER_RATE_MASK; + *val = ad7791_sample_freq_avail[rate][0]; + *val2 = ad7791_sample_freq_avail[rate][1]; + return IIO_VAL_INT_PLUS_MICRO; } return -EINVAL; } -static const char * const ad7791_sample_freq_avail[] = { - [AD7791_FILTER_RATE_120] = "120", - [AD7791_FILTER_RATE_100] = "100", - [AD7791_FILTER_RATE_33_3] = "33.3", - [AD7791_FILTER_RATE_20] = "20", - [AD7791_FILTER_RATE_16_6] = "16.6", - [AD7791_FILTER_RATE_16_7] = "16.7", - [AD7791_FILTER_RATE_13_3] = "13.3", - [AD7791_FILTER_RATE_9_5] = "9.5", -}; - -static ssize_t ad7791_read_frequency(struct device *dev, - struct device_attribute *attr, char *buf) +static int ad7791_write_raw(struct iio_dev *indio_dev, + struct iio_chan_spec const *chan, int val, int val2, long mask) { - struct iio_dev *indio_dev = dev_to_iio_dev(dev); struct ad7791_state *st = iio_priv(indio_dev); - unsigned int rate = st->filter & AD7791_FILTER_RATE_MASK; - - return sprintf(buf, "%s\n", ad7791_sample_freq_avail[rate]); -} - -static ssize_t ad7791_write_frequency(struct device *dev, - struct device_attribute *attr, const char *buf, size_t len) -{ - struct iio_dev *indio_dev = dev_to_iio_dev(dev); - struct ad7791_state *st = iio_priv(indio_dev); - int i, ret; - - i = sysfs_match_string(ad7791_sample_freq_avail, buf); - if (i < 0) - return i; + int ret, i; ret = iio_device_claim_direct_mode(indio_dev); if (ret) return ret; - st->filter &= ~AD7791_FILTER_RATE_MASK; - st->filter |= i; - ad_sd_write_reg(&st->sd, AD7791_REG_FILTER, sizeof(st->filter), - st->filter); - iio_device_release_direct_mode(indio_dev); - return len; -} + switch (mask) { + case IIO_CHAN_INFO_SAMP_FREQ: + for (i = 0; i < ARRAY_SIZE(ad7791_sample_freq_avail); i++) { + if (ad7791_sample_freq_avail[i][0] == val && + ad7791_sample_freq_avail[i][1] == val2) + break; + } + + if (i == ARRAY_SIZE(ad7791_sample_freq_avail)) { + ret = -EINVAL; + break; + } + + st->filter &= ~AD7791_FILTER_RATE_MASK; + st->filter |= i; + ad_sd_write_reg(&st->sd, AD7791_REG_FILTER, + sizeof(st->filter), + st->filter); + break; + default: + ret = -EINVAL; + } -static IIO_DEV_ATTR_SAMP_FREQ(S_IWUSR | S_IRUGO, - ad7791_read_frequency, - ad7791_write_frequency); + iio_device_release_direct_mode(indio_dev); + return ret; +} static IIO_CONST_ATTR_SAMP_FREQ_AVAIL("120 100 33.3 20 16.7 16.6 13.3 9.5"); static struct attribute *ad7791_attributes[] = { - &iio_dev_attr_sampling_frequency.dev_attr.attr, &iio_const_attr_sampling_frequency_available.dev_attr.attr, NULL }; @@ -306,12 +311,14 @@ static const struct attribute_group ad7791_attribute_group = { static const struct iio_info ad7791_info = { .read_raw = &ad7791_read_raw, + .write_raw = &ad7791_write_raw, .attrs = &ad7791_attribute_group, .validate_trigger = ad_sd_validate_trigger, }; static const struct iio_info ad7791_no_filter_info = { .read_raw = &ad7791_read_raw, + .write_raw = &ad7791_write_raw, .validate_trigger = ad_sd_validate_trigger, }; |