On Thu, 13 Dec 2018 14:46:18 +0200
Stefan Popa <stefan.popa@xxxxxxxxxx> wrote:
> When looking for the available scale or oversampling ratio, it is better
> to use the find_closest() macro. This simplifies the code and also does
> not require an exact value to be entered from the user space.
>
> Signed-off-by: Stefan Popa <stefan.popa@xxxxxxxxxx>
Nice little cleanup.
Applied to the togreg branch of iio.git and pushed out as testing for
the autobuilders to play with it.
Thanks,
Jonathan
> ---
> drivers/staging/iio/adc/ad7606.c | 58 +++++++++++++++-------------------------
> 1 file changed, 22 insertions(+), 36 deletions(-)
>
> diff --git a/drivers/staging/iio/adc/ad7606.c b/drivers/staging/iio/adc/ad7606.c
> index 13aeeec..0925379 100644
> --- a/drivers/staging/iio/adc/ad7606.c
> +++ b/drivers/staging/iio/adc/ad7606.c
> @@ -16,6 +16,7 @@
> #include <linux/delay.h>
> #include <linux/sched.h>
> #include <linux/module.h>
> +#include <linux/util_macros.h>
>
> #include <linux/iio/iio.h>
> #include <linux/iio/sysfs.h>
> @@ -30,8 +31,12 @@
> * Scales are computed as 5000/32768 and 10000/32768 respectively,
> * so that when applied to the raw values they provide mV values
> */
> -static const unsigned int scale_avail[2][2] = {
> - {0, 152588}, {0, 305176}
> +static const unsigned int scale_avail[2] = {
> + 152588, 305176
> +};
> +
> +static const unsigned int ad7606_oversampling_avail[7] = {
> + 1, 2, 4, 8, 16, 32, 64,
> };
>
> static int ad7606_reset(struct ad7606_state *st)
> @@ -148,8 +153,8 @@ static int ad7606_read_raw(struct iio_dev *indio_dev,
> *val = (short)ret;
> return IIO_VAL_INT;
> case IIO_CHAN_INFO_SCALE:
> - *val = scale_avail[st->range][0];
> - *val2 = scale_avail[st->range][1];
> + *val = 0;
> + *val2 = scale_avail[st->range];
> return IIO_VAL_INT_PLUS_MICRO;
> case IIO_CHAN_INFO_OVERSAMPLING_RATIO:
> *val = st->oversampling;
> @@ -165,8 +170,8 @@ static ssize_t in_voltage_scale_available_show(struct device *dev,
> int i, len = 0;
>
> for (i = 0; i < ARRAY_SIZE(scale_avail); i++)
> - len += scnprintf(buf + len, PAGE_SIZE - len, "%d.%06u ",
> - scale_avail[i][0], scale_avail[i][1]);
> + len += scnprintf(buf + len, PAGE_SIZE - len, "0.%06u ",
> + scale_avail[i]);
>
> buf[len - 1] = '\n';
>
> @@ -175,18 +180,6 @@ static ssize_t in_voltage_scale_available_show(struct device *dev,
>
> static IIO_DEVICE_ATTR_RO(in_voltage_scale_available, 0);
>
> -static int ad7606_oversampling_get_index(unsigned int val)
> -{
> - unsigned char supported[] = {1, 2, 4, 8, 16, 32, 64};
> - int i;
> -
> - for (i = 0; i < ARRAY_SIZE(supported); i++)
> - if (val == supported[i])
> - return i;
> -
> - return -EINVAL;
> -}
> -
> static int ad7606_write_raw(struct iio_dev *indio_dev,
> struct iio_chan_spec const *chan,
> int val,
> @@ -195,36 +188,29 @@ static int ad7606_write_raw(struct iio_dev *indio_dev,
> {
> struct ad7606_state *st = iio_priv(indio_dev);
> DECLARE_BITMAP(values, 3);
> - int ret, i;
> + int i;
>
> switch (mask) {
> case IIO_CHAN_INFO_SCALE:
> - ret = -EINVAL;
> mutex_lock(&st->lock);
> - for (i = 0; i < ARRAY_SIZE(scale_avail); i++)
> - if (val2 == scale_avail[i][1]) {
> - gpiod_set_value(st->gpio_range, i);
> - st->range = i;
> -
> - ret = 0;
> - break;
> - }
> + i = find_closest(val2, scale_avail, ARRAY_SIZE(scale_avail));
> + gpiod_set_value(st->gpio_range, i);
> + st->range = i;
> mutex_unlock(&st->lock);
>
> - return ret;
> + return 0;
> case IIO_CHAN_INFO_OVERSAMPLING_RATIO:
> if (val2)
> return -EINVAL;
> - ret = ad7606_oversampling_get_index(val);
> - if (ret < 0)
> - return ret;
> + i = find_closest(val, ad7606_oversampling_avail,
> + ARRAY_SIZE(ad7606_oversampling_avail));
>
> - values[0] = ret;
> + values[0] = i;
>
> mutex_lock(&st->lock);
> - gpiod_set_array_value(3, st->gpio_os->desc, st->gpio_os->info,
> - values);
> - st->oversampling = val;
> + gpiod_set_array_value(ARRAY_SIZE(values), st->gpio_os->desc,
> + st->gpio_os->info, values);
> + st->oversampling = ad7606_oversampling_avail[i];
> mutex_unlock(&st->lock);
>
> return 0;
