diff options
| author | Renato Lui Geh <renatogeh@gmail.com> | 2019-03-15 23:13:42 -0300 |
|---|---|---|
| committer | Jonathan Cameron <Jonathan.Cameron@huawei.com> | 2019-04-04 20:20:03 +0100 |
| commit | 0ee6d5ebe13df2281c192c03adbd59c3e4f4e468 (patch) | |
| tree | 77fb8aa6d6ff51a41c1e70c8d5e875cb8c26e06f /drivers/staging/iio/adc | |
| parent | 0149ba2d5b6d6799e6aeb1ae25773008745c1c5a (diff) | |
staging: iio: ad7780: add filter reading to ad778x
This patch adds the new feature of reading the filter odr value for
ad778x chips. This value is stored in the chip's state struct whenever a
read or write call is performed on the chip's driver.
This feature requires sharing SAMP_FREQ. Since the ad717x does not have
a filter option, the driver only shares the relevant info mask for the
ad778x family.
Signed-off-by: Renato Lui Geh <renatogeh@gmail.com>
Signed-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>
Diffstat (limited to 'drivers/staging/iio/adc')
| -rw-r--r-- | drivers/staging/iio/adc/ad7780.c | 18 |
1 files changed, 14 insertions, 4 deletions
diff --git a/drivers/staging/iio/adc/ad7780.c b/drivers/staging/iio/adc/ad7780.c index abb30c161b00..ae329bf9a1fa 100644 --- a/drivers/staging/iio/adc/ad7780.c +++ b/drivers/staging/iio/adc/ad7780.c @@ -42,7 +42,8 @@ #define AD7780_GAIN_MIDPOINT 64 #define AD7780_FILTER_MIDPOINT 13350 -static const unsigned int ad778x_gain[2] = { 1, 128 }; +static const unsigned int ad778x_gain[2] = { 1, 128 }; +static const unsigned int ad778x_odr_avail[2] = { 10000, 16700 }; struct ad7780_chip_info { struct iio_chan_spec channel; @@ -58,6 +59,7 @@ struct ad7780_state { struct gpio_desc *gain_gpio; struct gpio_desc *filter_gpio; unsigned int gain; + unsigned int odr; unsigned int int_vref_mv; struct ad_sigma_delta sd; @@ -120,6 +122,9 @@ static int ad7780_read_raw(struct iio_dev *indio_dev, case IIO_CHAN_INFO_OFFSET: *val = -(1 << (chan->scan_type.realbits - 1)); return IIO_VAL_INT; + case IIO_CHAN_INFO_SAMP_FREQ: + *val = st->odr; + return IIO_VAL_INT; default: break; } @@ -162,6 +167,7 @@ static int ad7780_write_raw(struct iio_dev *indio_dev, val = 0; else val = 1; + st->odr = ad778x_odr_avail[val]; gpiod_set_value(st->filter_gpio, val); break; default: @@ -181,8 +187,10 @@ static int ad7780_postprocess_sample(struct ad_sigma_delta *sigma_delta, ((raw_sample & chip_info->pattern_mask) != chip_info->pattern)) return -EIO; - if (chip_info->is_ad778x) + if (chip_info->is_ad778x) { st->gain = ad778x_gain[raw_sample & AD7780_GAIN]; + st->odr = ad778x_odr_avail[raw_sample & AD7780_FILTER]; + } return 0; } @@ -194,17 +202,19 @@ static const struct ad_sigma_delta_info ad7780_sigma_delta_info = { }; #define AD7780_CHANNEL(bits, wordsize) \ + AD_SD_CHANNEL(1, 0, 0, bits, 32, wordsize - bits) +#define AD7170_CHANNEL(bits, wordsize) \ AD_SD_CHANNEL_NO_SAMP_FREQ(1, 0, 0, bits, 32, wordsize - bits) static const struct ad7780_chip_info ad7780_chip_info_tbl[] = { [ID_AD7170] = { - .channel = AD7780_CHANNEL(12, 24), + .channel = AD7170_CHANNEL(12, 24), .pattern = AD7170_PATTERN, .pattern_mask = AD7170_PATTERN_MASK, .is_ad778x = false, }, [ID_AD7171] = { - .channel = AD7780_CHANNEL(16, 24), + .channel = AD7170_CHANNEL(16, 24), .pattern = AD7170_PATTERN, .pattern_mask = AD7170_PATTERN_MASK, .is_ad778x = false, |