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Commit 8cfa26a7 authored by Andy Shevchenko's avatar Andy Shevchenko Committed by Jonathan Cameron
Browse files

iio: adc: ti-ads7950: Allow to use on ACPI platforms 



ACPI enabled platforms do not have a mean of regulators. Instead we use
hard coded voltage value for reference pin. When value is 0 (default) we
fall back to request a regulator.

Signed-off-by: default avatarAndy Shevchenko <andriy.shevchenko@linux.intel.com>
Signed-off-by: default avatarJonathan Cameron <Jonathan.Cameron@huawei.com>
parent 0a60340f

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");