On Mon, 22 May 2017 17:51:45 -0700
Tony Lindgren <tony@xxxxxxxxxxx> wrote:
> It seems that "MC13783 Power Management and Audio Ciruit User's Guide"
> MC1378UG.pdf documents several similar components as in the CPCAP PMIC.
>
> Chapter "9.5.5 Die Temperature and UID" says that the die temperature
> value is 282 at 25C with LSB of -1.14C. Converting CPCAP PMIC channel3
> values with following seems to produce values that make sense for a
> PMIC die:
>
> temperature = 25000 + ((regval - 282) * 114)
>
> As we don't have any other documentation, let's assume the die
> temperature is unconfigured in the Motorola mapphone Linux kernel
> and the current temperature conversion table should be only used
> for the battery thermistor and not for the die temperature.
>
> Cc: Marcel Partap <mpartap@xxxxxxx>
> Cc: Michael Scott <michael.scott@xxxxxxxxxx>
> Cc: Sebastian Reichel <sre@xxxxxxxxxx>
> Signed-off-by: Tony Lindgren <tony@xxxxxxxxxxx>
Applied to the togreg branch of iio.git which will shortly be
pushed out as testing for the autobuilders to play with it.
Thanks,
Jonathan
> ---
> drivers/iio/adc/cpcap-adc.c | 31 ++++++++++++++++++++++++++++---
> 1 file changed, 28 insertions(+), 3 deletions(-)
>
> diff --git a/drivers/iio/adc/cpcap-adc.c b/drivers/iio/adc/cpcap-adc.c
> --- a/drivers/iio/adc/cpcap-adc.c
> +++ b/drivers/iio/adc/cpcap-adc.c
> @@ -875,6 +875,22 @@ static int cpcap_adc_init_request(struct cpcap_adc_request *req,
> return 0;
> }
>
> +static int cpcap_adc_read_st_die_temp(struct cpcap_adc *ddata,
> + int addr, int *val)
> +{
> + int error;
> +
> + error = regmap_read(ddata->reg, addr, val);
> + if (error)
> + return error;
> +
> + *val -= 282;
> + *val *= 114;
> + *val += 25000;
> +
> + return 0;
> +}
> +
> static int cpcap_adc_read(struct iio_dev *indio_dev,
> struct iio_chan_spec const *chan,
> int *val, int *val2, long mask)
> @@ -906,9 +922,18 @@ static int cpcap_adc_read(struct iio_dev *indio_dev,
> error = cpcap_adc_start_bank(ddata, &req);
> if (error)
> goto err_unlock;
> - error = cpcap_adc_read_bank_scaled(ddata, &req);
> - if (error)
> - goto err_unlock;
> + if ((ddata->vendor == CPCAP_VENDOR_ST) &&
> + (chan->channel == CPCAP_ADC_AD3)) {
> + error = cpcap_adc_read_st_die_temp(ddata,
> + chan->address,
> + &req.result);
> + if (error)
> + goto err_unlock;
> + } else {
> + error = cpcap_adc_read_bank_scaled(ddata, &req);
> + if (error)
> + goto err_unlock;
> + }
> error = cpcap_adc_stop_bank(ddata);
> if (error)
> goto err_unlock;
--
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