On Mon, Oct 21, 2019 at 05:41:14PM +0200, Nuno Sá wrote:
> The ltc2947 is a high precision power and energy monitor with an
> internal sense resistor supporting up to +/- 30A. Three internal no
> Latency ADCs ensure accurate measurement of voltage and current, while
> high-bandwidth analog multiplication of voltage and current provides
> accurate power measurement in a wide range of applications. Internal or
> external clocking options enable precise charge and energy measurements.
>
> Signed-off-by: Nuno Sá <nuno.sa@xxxxxxxxxx>
[ ... ]
> +
> +static ssize_t ltc2947_show_value(struct device *dev,
> + struct device_attribute *da, char *buf)
> +{
> + struct ltc2947_data *st = dev_get_drvdata(dev);
> + struct sensor_device_attribute *attr = to_sensor_dev_attr(da);
> + int ret;
> + s64 val = 0;
> +
> + switch (attr->index) {
> + case LTC2947_REG_ENERGY1:
> + case LTC2947_REG_ENERGY2:
> + ret = ltc2947_val_read(st, attr->index, PAGE0, 6, &val);
> + break;
> + default:
> + return -EINVAL;
> + }
This complexity is also unnecessary: index is either LTC2947_REG_ENERGY1 or
LTC2947_REG_ENERGY2. I removed the case statement when applying.
Guenter
