On Mon, 7 Oct 2024 21:49:42 +0200
Vasileios Amoiridis <vassilisamir@xxxxxxxxx> wrote:
> Add forced mode support in sensors BMP28x, BME28x, BMP3xx and BMP58x.
> Sensors BMP18x and BMP085 are old and do not support this feature so
> their operation is not affected at all.
>
> Essentially, up to now, the rest of the sensors were used in normal mode
> all the time. This means that they are continuously doing measurements
> even though these measurements are not used. Even though the sensor does
> provide PM support, to cover all the possible use cases, the sensor needs
> to go into sleep mode and wake up whenever necessary.
>
> The idea is that the sensor is by default in sleep mode, wakes up in
> forced mode when a oneshot capture is requested, or in normal mode
> when the buffer is enabled. The difference lays in the fact that in
> forced mode, the sensor does only one conversion and goes back to sleep
> while in normal mode, the sensor does continuous measurements with the
> frequency that was set in the ODR registers.
>
> The bmpX_chip_config() functions which are responsible for applying
> the requested configuration to the sensor, are modified accordingly
> in order to set the sensor by default in sleep mode.
>
> DEEP STANDBY, Low Power NORMAL and CONTINUOUS modes, supported only by
> the BMP58x version, are not added.
>
> Reviewed-by: Andy Shevchenko <andriy.shevchenko@xxxxxxxxxxxxxxx>
> Signed-off-by: Vasileios Amoiridis <vassilisamir@xxxxxxxxx>
Hi Vasilieos
Given it looks like you'll be doing a v9 anyway, a few comments inline
on some minor simplifications and potential readability improvements.
Thanks,
Jonathan
> ---
> drivers/iio/pressure/bmp280-core.c | 296 +++++++++++++++++++++++++++--
> drivers/iio/pressure/bmp280.h | 21 ++
> 2 files changed, 296 insertions(+), 21 deletions(-)
>
> diff --git a/drivers/iio/pressure/bmp280-core.c b/drivers/iio/pressure/bmp280-core.c
> index 6811619c6f11..9ad29cf4c2ac 100644
> --- a/drivers/iio/pressure/bmp280-core.c
> +++ b/drivers/iio/pressure/bmp280-core.c
> @@ -16,6 +16,11 @@
> @@ -1522,6 +1610,71 @@ static int bmp380_preinit(struct bmp280_data *data)
> return bmp380_cmd(data, BMP380_CMD_SOFT_RESET);
> }
>
> +static const u8 bmp380_operation_mode[] = {
> + BMP380_MODE_SLEEP, BMP380_MODE_FORCED, BMP380_MODE_NORMAL,
> +};
As below - I'd assign these to specific entries to make the fairly obvious association
even more obvious!
> +
> +static int bmp380_set_mode(struct bmp280_data *data, enum bmp280_op_mode mode)
> +{
> + int ret;
> +
> + switch (mode) {
> + case BMP280_SLEEP:
> + case BMP280_FORCED:
> + case BMP280_NORMAL:
> + break;
> + default:
> + return -EINVAL;
Currently there aren't others. So the compiler should shout if you try to pass
something else. Hence this check shouldn't be needed.
> + }
> +
> + ret = regmap_write_bits(data->regmap, BMP380_REG_POWER_CONTROL,
> + BMP380_MODE_MASK,
> + FIELD_PREP(BMP380_MODE_MASK,
> + bmp380_operation_mode[mode]));
> + if (ret) {
> + dev_err(data->dev, "failed to write power control register.\n");
> + return ret;
> + }
> +
> + data->op_mode = mode;
> +
> + return 0;
> +}
>
> return PTR_ERR_OR_ZERO(devm_nvmem_register(config.dev, &config));
> }
>
> +static const u8 bmp580_operation_mode[] = {
> + BMP580_MODE_SLEEP, BMP580_MODE_FORCED, BMP580_MODE_NORMAL,
For these, explicit setting will make it more obvious.
[BMP280_SLEEP] = BMP580_MODE_SLEEP,
etc
> +};
> +
> +static int bmp580_set_mode(struct bmp280_data *data, enum bmp280_op_mode mode)
> +{
> + struct device *dev = data->dev;
> + int ret;
> +
> + switch (mode) {
> + case BMP280_SLEEP:
> + case BMP280_NORMAL:
> + break;
> + case BMP280_FORCED:
> + ret = regmap_set_bits(data->regmap, BMP580_REG_DSP_CONFIG,
> + BMP580_DSP_IIR_FORCED_FLUSH);
> + if (ret) {
> + dev_err(dev, "Could not flush IIR filter constants.\n");
> + return ret;
> + }
> + break;
> + default:
There are only the values above, and we should hopefully be able to rely
on compiler warnings to shout at us if a future modification adds more.
So should be able to drop the default here.
> + return -EINVAL;
> + }
> +
> + ret = regmap_write_bits(data->regmap, BMP580_REG_ODR_CONFIG,
> + BMP580_MODE_MASK,
> + FIELD_PREP(BMP580_MODE_MASK,
> + bmp580_operation_mode[mode]));
> + if (ret) {
> + dev_err(dev, "failed to write power control register.\n");
> + return ret;
> + }
> +
> + data->op_mode = mode;
> +
> + return 0;
> +}
