On 10/10/16 11:01, Eva Rachel Retuya wrote:
> This driver predates the availability of IIO_CHAN_INFO_SAMP_FREQ
> attribute wherein usage has some advantages like it can be accessed by
> in-kernel consumers as well as reduces the code size.
>
> Therefore, use IIO_CHAN_INFO_SAMP_FREQ to implement the
> sampling_frequency attribute instead of using IIO_DEVICE_ATTR() macro.
>
> Move code from the functions associated with IIO_DEVICE_ATTR() into
> respective read and write hooks with the mask set to
> IIO_CHAN_INFO_SAMP_FREQ.
>
> Signed-off-by: Eva Rachel Retuya <eraretuya@xxxxxxxxx>
Good patch.
Applied to the togreg branch of iio.git and pushed out as testing
for the autobuilders to play with it.
Thanks,
Jonathan
> ---
> Change in v2:
> * Re-use and modify the store functions to serve as write_raw handlers
> for the sampling_frequency attribute
>
> drivers/staging/iio/cdc/ad7746.c | 120 ++++++++++++++++-----------------------
> 1 file changed, 50 insertions(+), 70 deletions(-)
>
> diff --git a/drivers/staging/iio/cdc/ad7746.c b/drivers/staging/iio/cdc/ad7746.c
> index 5771d4ee..f41251c 100644
> --- a/drivers/staging/iio/cdc/ad7746.c
> +++ b/drivers/staging/iio/cdc/ad7746.c
> @@ -122,7 +122,8 @@ static const struct iio_chan_spec ad7746_channels[] = {
> .indexed = 1,
> .channel = 0,
> .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_SAMP_FREQ),
> .address = AD7746_REG_VT_DATA_HIGH << 8 |
> AD7746_VTSETUP_VTMD_EXT_VIN,
> },
> @@ -132,7 +133,8 @@ static const struct iio_chan_spec ad7746_channels[] = {
> .channel = 1,
> .extend_name = "supply",
> .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_SAMP_FREQ),
> .address = AD7746_REG_VT_DATA_HIGH << 8 |
> AD7746_VTSETUP_VTMD_VDD_MON,
> },
> @@ -159,7 +161,7 @@ static const struct iio_chan_spec ad7746_channels[] = {
> .info_mask_separate = BIT(IIO_CHAN_INFO_RAW) |
> BIT(IIO_CHAN_INFO_CALIBSCALE) | BIT(IIO_CHAN_INFO_OFFSET),
> .info_mask_shared_by_type = BIT(IIO_CHAN_INFO_CALIBBIAS) |
> - BIT(IIO_CHAN_INFO_SCALE),
> + BIT(IIO_CHAN_INFO_SCALE) | BIT(IIO_CHAN_INFO_SAMP_FREQ),
> .address = AD7746_REG_CAP_DATA_HIGH << 8,
> },
> [CIN1_DIFF] = {
> @@ -171,7 +173,7 @@ static const struct iio_chan_spec ad7746_channels[] = {
> .info_mask_separate = BIT(IIO_CHAN_INFO_RAW) |
> BIT(IIO_CHAN_INFO_CALIBSCALE) | BIT(IIO_CHAN_INFO_OFFSET),
> .info_mask_shared_by_type = BIT(IIO_CHAN_INFO_CALIBBIAS) |
> - BIT(IIO_CHAN_INFO_SCALE),
> + BIT(IIO_CHAN_INFO_SCALE) | BIT(IIO_CHAN_INFO_SAMP_FREQ),
> .address = AD7746_REG_CAP_DATA_HIGH << 8 |
> AD7746_CAPSETUP_CAPDIFF
> },
> @@ -182,7 +184,7 @@ static const struct iio_chan_spec ad7746_channels[] = {
> .info_mask_separate = BIT(IIO_CHAN_INFO_RAW) |
> BIT(IIO_CHAN_INFO_CALIBSCALE) | BIT(IIO_CHAN_INFO_OFFSET),
> .info_mask_shared_by_type = BIT(IIO_CHAN_INFO_CALIBBIAS) |
> - BIT(IIO_CHAN_INFO_SCALE),
> + BIT(IIO_CHAN_INFO_SCALE) | BIT(IIO_CHAN_INFO_SAMP_FREQ),
> .address = AD7746_REG_CAP_DATA_HIGH << 8 |
> AD7746_CAPSETUP_CIN2,
> },
> @@ -195,7 +197,7 @@ static const struct iio_chan_spec ad7746_channels[] = {
> .info_mask_separate = BIT(IIO_CHAN_INFO_RAW) |
> BIT(IIO_CHAN_INFO_CALIBSCALE) | BIT(IIO_CHAN_INFO_OFFSET),
> .info_mask_shared_by_type = BIT(IIO_CHAN_INFO_CALIBBIAS) |
> - BIT(IIO_CHAN_INFO_SCALE),
> + BIT(IIO_CHAN_INFO_SCALE) | BIT(IIO_CHAN_INFO_SAMP_FREQ),
> .address = AD7746_REG_CAP_DATA_HIGH << 8 |
> AD7746_CAPSETUP_CAPDIFF | AD7746_CAPSETUP_CIN2,
> }
> @@ -355,101 +357,47 @@ static IIO_DEVICE_ATTR(in_capacitance1_calibscale_calibration,
> static IIO_DEVICE_ATTR(in_voltage0_calibscale_calibration,
> S_IWUSR, NULL, ad7746_start_gain_calib, VIN);
>
> -static ssize_t ad7746_show_cap_filter_rate_setup(struct device *dev,
> - struct device_attribute *attr,
> - char *buf)
> +static int ad7746_store_cap_filter_rate_setup(struct ad7746_chip_info *chip,
> + int val)
> {
> - struct iio_dev *indio_dev = dev_to_iio_dev(dev);
> - struct ad7746_chip_info *chip = iio_priv(indio_dev);
> -
> - return sprintf(buf, "%d\n", ad7746_cap_filter_rate_table[
> - (chip->config >> 3) & 0x7][0]);
> -}
> -
> -static ssize_t ad7746_store_cap_filter_rate_setup(struct device *dev,
> - struct device_attribute *attr,
> - const char *buf,
> - size_t len)
> -{
> - struct iio_dev *indio_dev = dev_to_iio_dev(dev);
> - struct ad7746_chip_info *chip = iio_priv(indio_dev);
> - u8 data;
> - int ret, i;
> -
> - ret = kstrtou8(buf, 10, &data);
> - if (ret < 0)
> - return ret;
> + int i;
>
> for (i = 0; i < ARRAY_SIZE(ad7746_cap_filter_rate_table); i++)
> - if (data >= ad7746_cap_filter_rate_table[i][0])
> + if (val >= ad7746_cap_filter_rate_table[i][0])
> break;
>
> if (i >= ARRAY_SIZE(ad7746_cap_filter_rate_table))
> i = ARRAY_SIZE(ad7746_cap_filter_rate_table) - 1;
>
> - mutex_lock(&indio_dev->mlock);
> chip->config &= ~AD7746_CONF_CAPFS(0x7);
> chip->config |= AD7746_CONF_CAPFS(i);
> - mutex_unlock(&indio_dev->mlock);
>
> - return len;
> + return 0;
> }
>
> -static ssize_t ad7746_show_vt_filter_rate_setup(struct device *dev,
> - struct device_attribute *attr,
> - char *buf)
> +static int ad7746_store_vt_filter_rate_setup(struct ad7746_chip_info *chip,
> + int val)
> {
> - struct iio_dev *indio_dev = dev_to_iio_dev(dev);
> - struct ad7746_chip_info *chip = iio_priv(indio_dev);
> -
> - return sprintf(buf, "%d\n", ad7746_vt_filter_rate_table[
> - (chip->config >> 6) & 0x3][0]);
> -}
> -
> -static ssize_t ad7746_store_vt_filter_rate_setup(struct device *dev,
> - struct device_attribute *attr,
> - const char *buf,
> - size_t len)
> -{
> - struct iio_dev *indio_dev = dev_to_iio_dev(dev);
> - struct ad7746_chip_info *chip = iio_priv(indio_dev);
> - u8 data;
> - int ret, i;
> -
> - ret = kstrtou8(buf, 10, &data);
> - if (ret < 0)
> - return ret;
> + int i;
>
> for (i = 0; i < ARRAY_SIZE(ad7746_vt_filter_rate_table); i++)
> - if (data >= ad7746_vt_filter_rate_table[i][0])
> + if (val >= ad7746_vt_filter_rate_table[i][0])
> break;
>
> if (i >= ARRAY_SIZE(ad7746_vt_filter_rate_table))
> i = ARRAY_SIZE(ad7746_vt_filter_rate_table) - 1;
>
> - mutex_lock(&indio_dev->mlock);
> chip->config &= ~AD7746_CONF_VTFS(0x3);
> chip->config |= AD7746_CONF_VTFS(i);
> - mutex_unlock(&indio_dev->mlock);
>
> - return len;
> + return 0;
> }
>
> -static IIO_DEVICE_ATTR(in_capacitance_sampling_frequency,
> - S_IRUGO | S_IWUSR, ad7746_show_cap_filter_rate_setup,
> - ad7746_store_cap_filter_rate_setup, 0);
> -
> -static IIO_DEVICE_ATTR(in_voltage_sampling_frequency,
> - S_IRUGO | S_IWUSR, ad7746_show_vt_filter_rate_setup,
> - ad7746_store_vt_filter_rate_setup, 0);
> -
> static IIO_CONST_ATTR(in_voltage_sampling_frequency_available, "50 31 16 8");
> static IIO_CONST_ATTR(in_capacitance_sampling_frequency_available,
> "91 84 50 26 16 13 11 9");
>
> static struct attribute *ad7746_attributes[] = {
> - &iio_dev_attr_in_capacitance_sampling_frequency.dev_attr.attr,
> - &iio_dev_attr_in_voltage_sampling_frequency.dev_attr.attr,
> &iio_dev_attr_in_capacitance0_calibbias_calibration.dev_attr.attr,
> &iio_dev_attr_in_capacitance0_calibscale_calibration.dev_attr.attr,
> &iio_dev_attr_in_capacitance1_calibscale_calibration.dev_attr.attr,
> @@ -547,6 +495,23 @@ static int ad7746_write_raw(struct iio_dev *indio_dev,
>
> ret = 0;
> break;
> + case IIO_CHAN_INFO_SAMP_FREQ:
> + if (val2) {
> + ret = -EINVAL;
> + goto out;
> + }
> +
> + switch (chan->type) {
> + case IIO_CAPACITANCE:
> + ret = ad7746_store_cap_filter_rate_setup(chip, val);
> + break;
> + case IIO_VOLTAGE:
> + ret = ad7746_store_vt_filter_rate_setup(chip, val);
> + break;
> + default:
> + ret = -EINVAL;
> + }
> + break;
> default:
> ret = -EINVAL;
> }
> @@ -667,6 +632,21 @@ static int ad7746_read_raw(struct iio_dev *indio_dev,
> }
>
> break;
> + case IIO_CHAN_INFO_SAMP_FREQ:
> + switch (chan->type) {
> + case IIO_CAPACITANCE:
> + *val = ad7746_cap_filter_rate_table[
> + (chip->config >> 3) & 0x7][0];
> + ret = IIO_VAL_INT;
> + break;
> + case IIO_VOLTAGE:
> + *val = ad7746_vt_filter_rate_table[
> + (chip->config >> 6) & 0x3][0];
> + break;
> + default:
> + ret = -EINVAL;
> + }
> + break;
> default:
> ret = -EINVAL;
> }
>
--
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