On Wed, Jan 15, 2025 at 09:16:22PM +0100, Antoni Pokusinski wrote:
> Silicon Labs Si7210 is an I2C Hall effect magnetic position and
> temperature sensor. The driver supports the following functionalities:
> * reading the temperature measurements
> * reading the magnetic field measurements in a single-shot mode
> * choosing the magnetic field measurement scale (20 or 200 mT)
...
> +obj-$(CONFIG_SI7210) += si7210.o
Looks like TAB/space mixture in the middle.
...
> +#include <asm/byteorder.h>
asm/* usually goes after linux/*
> +#include <linux/array_size.h>
> +#include <linux/bitfield.h>
> +#include <linux/bits.h>
> +#include <linux/cleanup.h>
> +#include <linux/err.h>
> +#include <linux/i2c.h>
> +#include <linux/iio/iio.h>
> +#include <linux/math64.h>
> +#include <linux/mod_devicetable.h>
> +#include <linux/mutex.h>
> +#include <linux/regmap.h>
> +#include <linux/regulator/consumer.h>
> +#include <linux/types.h>
> +#include <linux/units.h>
...
Despite a good formatting I would still add a comment with a formula in
math-human-readable form.
> + temp = FIELD_GET(GENMASK(14, 3), dspsig);
> + temp = div_s64(-383 * temp * temp, 100) + 160940 * temp - 279800000;
> + temp *= (1 + (data->temp_gain / 2048));
> + temp += (int)(MICRO / 16) * data->temp_offset;
> + ret = regulator_get_voltage(data->vdd);
> + if (ret < 0)
> + return ret;
> +
> + temp -= 222 * div_s64(ret, MILLI);
Including this piece.
> + *val = div_s64(temp, MILLI);
...
> +static int si7210_set_scale(struct si7210_data *data, unsigned int scale)
> +{
> + s8 *a_otp_values;
> + int ret;
> +
> + if (scale == 20)
> + a_otp_values = data->scale_20_a;
> + else if (scale == 200)
> + a_otp_values = data->scale_200_a;
> + else
> + return -EINVAL;
> +
> + guard(mutex)(&data->fetch_lock);
> +
> + /* Write the registers 0xCA - 0xCC */
> + ret = regmap_bulk_write(data->regmap, SI7210_REG_A0, a_otp_values, 3);
> + if (ret)
> + return ret;
> + /* Write the registers 0xCE - 0xD0 */
> + ret = regmap_bulk_write(data->regmap, SI7210_REG_A3, &a_otp_values[3], 3);
> + if (ret)
> + return ret;
Just to be sure I understand the above. There are two of 24-bit values or there are
two sets of 3 byte arrays? How does datasheet refers to them? What does common sense
tell us here?
> + data->curr_scale = scale;
> +
> + return 0;
> +}
...
Overall LGTM, there is no need for resend as I believe the three things above
may be tweaked by Jonathan. The last one can go even if there are 2 24-bit
values, but ideally in that case we should use those as a such and apply
put_unaligned_be24/le24() whichever suits better.
--
With Best Regards,
Andy Shevchenko
