staging: iio: adc: ad7192: Add system calibration support (42776c14) · Commits · 戴 / test

Documentation/ABI/testing/sysfs-bus-iio-adc-ad7192

+24 −0

Original line number	Diff line number	Diff line
		@@ -13,3 +13,27 @@ Description:
		need to minimize the system current consumption.
		Reading gives the state of the bridge switch.
		Writing '1' enables the bridge switch.

		What: /sys/bus/iio/devices/iio:deviceX/in_voltagex_sys_calibration
		KernelVersion:
		Contact: linux-iio@vger.kernel.org
		Description:
		Initiates the system calibration procedure. This is done on a
		single channel at a time. Write '1' to start the calibration.

		What: /sys/bus/iio/devices/iio:deviceX/in_voltagex_sys_calibration_mode_available
		KernelVersion:
		Contact: linux-iio@vger.kernel.org
		Description:
		Reading returns a list with the possible calibration modes.
		There are two available options:
		"zero_scale" - calibrate to zero scale
		"full_scale" - calibrate to full scale

		What: /sys/bus/iio/devices/iio:deviceX/in_voltagex_sys_calibration_mode
		KernelVersion:
		Contact: linux-iio@vger.kernel.org
		Description:
		Sets up the calibration mode used in the system calibration
		procedure. Reading returns the current calibration mode.
		Writing sets the system calibration mode.

drivers/staging/iio/adc/ad7192.c

+78 −1

Original line number	Diff line number	Diff line
		@@ -155,6 +155,11 @@
		* The DOUT/RDY output must also be wired to an interrupt capable GPIO.
		*/

		enum {
		AD7192_SYSCALIB_ZERO_SCALE,
		AD7192_SYSCALIB_FULL_SCALE,
		};

		struct ad7192_state {
		struct regulator *avdd;
		struct regulator *dvdd;
		@@ -169,10 +174,80 @@ struct ad7192_state {
		u8 devid;
		u8 clock_sel;
		struct mutex lock; /* protect sensor state */
		u8 syscalib_mode[8];

		struct ad_sigma_delta sd;
		};

		static const char * const ad7192_syscalib_modes[] = {
		[AD7192_SYSCALIB_ZERO_SCALE] = "zero_scale",
		[AD7192_SYSCALIB_FULL_SCALE] = "full_scale",
		};

		static int ad7192_set_syscalib_mode(struct iio_dev *indio_dev,
		const struct iio_chan_spec *chan,
		unsigned int mode)
		{
		struct ad7192_state *st = iio_priv(indio_dev);

		st->syscalib_mode[chan->channel] = mode;

		return 0;
		}

		static int ad7192_get_syscalib_mode(struct iio_dev *indio_dev,
		const struct iio_chan_spec *chan)
		{
		struct ad7192_state *st = iio_priv(indio_dev);

		return st->syscalib_mode[chan->channel];
		}

		static ssize_t ad7192_write_syscalib(struct iio_dev *indio_dev,
		uintptr_t private,
		const struct iio_chan_spec *chan,
		const char *buf, size_t len)
		{
		struct ad7192_state *st = iio_priv(indio_dev);
		bool sys_calib;
		int ret, temp;

		ret = strtobool(buf, &sys_calib);
		if (ret)
		return ret;

		temp = st->syscalib_mode[chan->channel];
		if (sys_calib) {
		if (temp == AD7192_SYSCALIB_ZERO_SCALE)
		ret = ad_sd_calibrate(&st->sd, AD7192_MODE_CAL_SYS_ZERO,
		chan->address);
		else
		ret = ad_sd_calibrate(&st->sd, AD7192_MODE_CAL_SYS_FULL,
		chan->address);
		}

		return ret ? ret : len;
		}

		static const struct iio_enum ad7192_syscalib_mode_enum = {
		.items = ad7192_syscalib_modes,
		.num_items = ARRAY_SIZE(ad7192_syscalib_modes),
		.set = ad7192_set_syscalib_mode,
		.get = ad7192_get_syscalib_mode
		};

		static const struct iio_chan_spec_ext_info ad7192_calibsys_ext_info[] = {
		{
		.name = "sys_calibration",
		.write = ad7192_write_syscalib,
		.shared = IIO_SEPARATE,
		},
		IIO_ENUM("sys_calibration_mode", IIO_SEPARATE,
		&ad7192_syscalib_mode_enum),
		IIO_ENUM_AVAILABLE("sys_calibration_mode", &ad7192_syscalib_mode_enum),
		{}
		};

		static struct ad7192_state ad_sigma_delta_to_ad7192(struct ad_sigma_delta sd)
		{
		return container_of(sd, struct ad7192_state, sd);
		@@ -770,9 +845,11 @@ static int ad7192_channels_config(struct iio_dev *indio_dev)
		*chan = channels[i];
		chan->info_mask_shared_by_all \|=
		BIT(IIO_CHAN_INFO_LOW_PASS_FILTER_3DB_FREQUENCY);
		if (chan->type != IIO_TEMP)
		if (chan->type != IIO_TEMP) {
		chan->info_mask_shared_by_type_available \|=
		BIT(IIO_CHAN_INFO_SCALE);
		chan->ext_info = ad7192_calibsys_ext_info;
		}
		chan++;
		}

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