Messages in this thread | | | Subject | Re: [PATCH 1/2] iio: ad_sigma_delta: Implement a dedicated reset function | From | Lars-Peter Clausen <> | Date | Tue, 5 Sep 2017 14:16:42 +0200 |
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On 09/05/2017 02:14 PM, Dragos Bogdan wrote: > Since most of the SD ADCs have the option of reseting the serial > interface by sending a number of SCLKs with CS = 0 and DIN = 1, > a dedicated function that can do this is usefull. > > Signed-off-by: Dragos Bogdan <dragos.bogdan@analog.com>
Acked-by: Lars-Peter Clausen <lars@metafoo.de>
> --- > drivers/iio/adc/ad_sigma_delta.c | 28 ++++++++++++++++++++++++++++ > include/linux/iio/adc/ad_sigma_delta.h | 3 +++ > 2 files changed, 31 insertions(+) > > diff --git a/drivers/iio/adc/ad_sigma_delta.c b/drivers/iio/adc/ad_sigma_delta.c > index d10bd0c97233..22c4c17cd996 100644 > --- a/drivers/iio/adc/ad_sigma_delta.c > +++ b/drivers/iio/adc/ad_sigma_delta.c > @@ -177,6 +177,34 @@ int ad_sd_read_reg(struct ad_sigma_delta *sigma_delta, > } > EXPORT_SYMBOL_GPL(ad_sd_read_reg); > > +/** > + * ad_sd_reset() - Reset the serial interface > + * > + * @sigma_delta: The sigma delta device > + * @reset_length: Number of SCLKs with DIN = 1 > + * > + * Returns 0 on success, an error code otherwise. > + **/ > +int ad_sd_reset(struct ad_sigma_delta *sigma_delta, > + unsigned int reset_length) > +{ > + uint8_t *buf; > + unsigned int size; > + int ret; > + > + size = DIV_ROUND_UP(reset_length, 8); > + buf = kcalloc(size, sizeof(*buf), GFP_KERNEL); > + if (!buf) > + return -ENOMEM; > + > + memset(buf, 0xff, size); > + ret = spi_write(sigma_delta->spi, buf, size); > + kfree(buf); > + > + return ret; > +} > +EXPORT_SYMBOL_GPL(ad_sd_reset); > + > static int ad_sd_calibrate(struct ad_sigma_delta *sigma_delta, > unsigned int mode, unsigned int channel) > { > diff --git a/include/linux/iio/adc/ad_sigma_delta.h b/include/linux/iio/adc/ad_sigma_delta.h > index 5ba430cc9a87..1fc7abd28b0b 100644 > --- a/include/linux/iio/adc/ad_sigma_delta.h > +++ b/include/linux/iio/adc/ad_sigma_delta.h > @@ -111,6 +111,9 @@ int ad_sd_write_reg(struct ad_sigma_delta *sigma_delta, unsigned int reg, > int ad_sd_read_reg(struct ad_sigma_delta *sigma_delta, unsigned int reg, > unsigned int size, unsigned int *val); > > +int ad_sd_reset(struct ad_sigma_delta *sigma_delta, > + unsigned int reset_length); > + > int ad_sigma_delta_single_conversion(struct iio_dev *indio_dev, > const struct iio_chan_spec *chan, int *val); > int ad_sd_calibrate_all(struct ad_sigma_delta *sigma_delta, >
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