iio: adc: ti-ads7950: Allow to use on ACPI platforms (8cfa26a7) · Commits · 戴 / test

drivers/iio/adc/ti-ads7950.c

+20 −4

Original line number	Diff line number	Diff line
		@@ -21,6 +21,7 @@
		* GNU General Public License for more details.
		*/

		#include <linux/acpi.h>
		#include <linux/bitops.h>
		#include <linux/device.h>
		#include <linux/err.h>
		@@ -37,6 +38,12 @@
		#include <linux/iio/trigger_consumer.h>
		#include <linux/iio/triggered_buffer.h>

		/*
		* In case of ACPI, we use the 5000 mV as default for the reference pin.
		* Device tree users encode that via the vref-supply regulator.
		*/
		#define TI_ADS7950_VA_MV_ACPI_DEFAULT 5000

		#define TI_ADS7950_CR_MANUAL BIT(12)
		#define TI_ADS7950_CR_WRITE BIT(11)
		#define TI_ADS7950_CR_CHAN(ch) ((ch) << 7)
		@@ -58,6 +65,7 @@ struct ti_ads7950_state {
		struct spi_message scan_single_msg;

		struct regulator *reg;
		unsigned int vref_mv;

		unsigned int settings;

		@@ -305,11 +313,15 @@ static int ti_ads7950_get_range(struct ti_ads7950_state *st)
		{
		int vref;

		if (st->vref_mv) {
		vref = st->vref_mv;
		} else {
		vref = regulator_get_voltage(st->reg);
		if (vref < 0)
		return vref;

		vref /= 1000;
		}

		if (st->settings & TI_ADS7950_CR_RANGE_5V)
		vref *= 2;
		@@ -411,6 +423,10 @@ static int ti_ads7950_probe(struct spi_device *spi)
		spi_message_init_with_transfers(&st->scan_single_msg,
		st->scan_single_xfer, 3);

		/* Use hard coded value for reference voltage in ACPI case */
		if (ACPI_COMPANION(&spi->dev))
		st->vref_mv = TI_ADS7950_VA_MV_ACPI_DEFAULT;

		st->reg = devm_regulator_get(&spi->dev, "vref");
		if (IS_ERR(st->reg)) {
		dev_err(&spi->dev, "Failed get get regulator \"vref\"\n");