On Thu, 17 Aug 2017 15:56:12 +0200
Michał Mirosław <mirq-linux@xxxxxxxxxxxx> wrote:
> Use AMI306 calibration data for randomness and debugging.
>
> Signed-off-by: Michał Mirosław <mirq-linux@xxxxxxxxxxxx>
Applied to the togreg branch of iio.git and pushed out as testing for the
autobuilders to play with it.
Thanks,
Jonathan
> ---
> drivers/iio/magnetometer/ak8974.c | 41 +++++++++++++++++++++++++++++++++++++++
> 1 file changed, 41 insertions(+)
>
> diff --git a/drivers/iio/magnetometer/ak8974.c b/drivers/iio/magnetometer/ak8974.c
> index d8c45206ba00..b3221b34606b 100644
> --- a/drivers/iio/magnetometer/ak8974.c
> +++ b/drivers/iio/magnetometer/ak8974.c
> @@ -445,6 +445,20 @@ static int ak8974_selftest(struct ak8974 *ak8974)
> return 0;
> }
>
> +static void ak8974_read_calib_data(struct ak8974 *ak8974, unsigned int reg,
> + __le16 *tab, size_t tab_size)
> +{
> + int ret = regmap_bulk_read(ak8974->map, reg, tab, tab_size);
> + if (ret) {
> + memset(tab, 0xFF, tab_size);
> + dev_warn(&ak8974->i2c->dev,
> + "can't read calibration data (regs %u..%u): %d\n",
> + reg, reg + tab_size - 1, ret);
> + } else {
> + add_device_randomness(tab, tab_size);
> + }
> +}
> +
> static int ak8974_detect(struct ak8974 *ak8974)
> {
> unsigned int whoami;
> @@ -490,6 +504,33 @@ static int ak8974_detect(struct ak8974 *ak8974)
> ak8974->name = name;
> ak8974->variant = whoami;
>
> + if (whoami == AK8974_WHOAMI_VALUE_AMI306) {
> + __le16 fab_data1[9], fab_data2[3];
> + int i;
> +
> + ak8974_read_calib_data(ak8974, AMI306_FINEOUTPUT_X,
> + fab_data1, sizeof(fab_data1));
> + ak8974_read_calib_data(ak8974, AMI306_OFFZERO_X,
> + fab_data2, sizeof(fab_data2));
> +
> + for (i = 0; i < 3; ++i) {
> + static const char axis[3] = "XYZ";
> + static const char pgaxis[6] = "ZYZXYX";
> + unsigned offz = le16_to_cpu(fab_data2[i]) & 0x7F;
> + unsigned fine = le16_to_cpu(fab_data1[i]);
> + unsigned sens = le16_to_cpu(fab_data1[i + 3]);
> + unsigned pgain1 = le16_to_cpu(fab_data1[i + 6]);
> + unsigned pgain2 = pgain1 >> 8;
> +
> + pgain1 &= 0xFF;
> +
> + dev_info(&ak8974->i2c->dev,
> + "factory calibration for axis %c: offz=%u sens=%u fine=%u pga%c=%u pga%c=%u\n",
> + axis[i], offz, sens, fine, pgaxis[i * 2],
> + pgain1, pgaxis[i * 2 + 1], pgain2);
> + }
> + }
> +
> return 0;
> }
>
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