Commit 7af5257d authored by Miquel Raynal's avatar Miquel Raynal Committed by Jonathan Cameron
Browse files

iio: adc: max1027: Prepare the introduction of different resolutions 



Maxim's max1027/29/31 series returns the measured voltages with a
resolution of 10 bits. There is a very similar series, max1227/29/31
which works identically but uses a resolution of 12 bits. Prepare the
support for these chips by turning the 'depth' into a macro parameter
instead of hardcoding it everywhere. Also reorganize just a bit the
macros at the top to avoid repeating tens of lines when adding support
for a new chip.

Signed-off-by: default avatarMiquel Raynal <miquel.raynal@bootlin.com>
Signed-off-by: default avatarJonathan Cameron <Jonathan.Cameron@huawei.com>
parent db033831

drivers/iio/adc/max1027.c

+32 −42
Original line number Diff line number Diff line
@@ -83,7 +83,7 @@ static const struct of_device_id max1027_adc_dt_ids[] = { 
MODULE_DEVICE_TABLE(of, max1027_adc_dt_ids);

#endif



#define MAX1027_V_CHAN(index)						\

#define MAX1027_V_CHAN(index, depth)					\

	{								\

		.type = IIO_VOLTAGE,					\

		.indexed = 1,						\
@@ -93,7 +93,7 @@ MODULE_DEVICE_TABLE(of, max1027_adc_dt_ids); 
		.scan_index = index + 1,				\

		.scan_type = {						\

			.sign = 'u',					\

			.realbits = 10,					\

			.realbits = depth,				\

			.storagebits = 16,				\

			.shift = 2,					\

			.endianness = IIO_BE,				\
@@ -115,52 +115,42 @@ MODULE_DEVICE_TABLE(of, max1027_adc_dt_ids); 
		},							\

	}



#define MAX1X27_CHANNELS(depth)			\

	MAX1027_T_CHAN,				\

	MAX1027_V_CHAN(0, depth),		\

	MAX1027_V_CHAN(1, depth),		\

	MAX1027_V_CHAN(2, depth),		\

	MAX1027_V_CHAN(3, depth),		\

	MAX1027_V_CHAN(4, depth),		\

	MAX1027_V_CHAN(5, depth),		\

	MAX1027_V_CHAN(6, depth),		\

	MAX1027_V_CHAN(7, depth)



#define MAX1X29_CHANNELS(depth)			\

	MAX1X27_CHANNELS(depth),		\

	MAX1027_V_CHAN(8, depth),		\

	MAX1027_V_CHAN(9, depth),		\

	MAX1027_V_CHAN(10, depth),		\

	MAX1027_V_CHAN(11, depth)



#define MAX1X31_CHANNELS(depth)			\

	MAX1X27_CHANNELS(depth),		\

	MAX1X29_CHANNELS(depth),		\

	MAX1027_V_CHAN(12, depth),		\

	MAX1027_V_CHAN(13, depth),		\

	MAX1027_V_CHAN(14, depth),		\

	MAX1027_V_CHAN(15, depth)



static const struct iio_chan_spec max1027_channels[] = {

	MAX1027_T_CHAN,

	MAX1027_V_CHAN(0),

	MAX1027_V_CHAN(1),

	MAX1027_V_CHAN(2),

	MAX1027_V_CHAN(3),

	MAX1027_V_CHAN(4),

	MAX1027_V_CHAN(5),

	MAX1027_V_CHAN(6),

	MAX1027_V_CHAN(7)

	MAX1X27_CHANNELS(10),

};



static const struct iio_chan_spec max1029_channels[] = {

	MAX1027_T_CHAN,

	MAX1027_V_CHAN(0),

	MAX1027_V_CHAN(1),

	MAX1027_V_CHAN(2),

	MAX1027_V_CHAN(3),

	MAX1027_V_CHAN(4),

	MAX1027_V_CHAN(5),

	MAX1027_V_CHAN(6),

	MAX1027_V_CHAN(7),

	MAX1027_V_CHAN(8),

	MAX1027_V_CHAN(9),

	MAX1027_V_CHAN(10),

	MAX1027_V_CHAN(11)

	MAX1X29_CHANNELS(10),

};



static const struct iio_chan_spec max1031_channels[] = {

	MAX1027_T_CHAN,

	MAX1027_V_CHAN(0),

	MAX1027_V_CHAN(1),

	MAX1027_V_CHAN(2),

	MAX1027_V_CHAN(3),

	MAX1027_V_CHAN(4),

	MAX1027_V_CHAN(5),

	MAX1027_V_CHAN(6),

	MAX1027_V_CHAN(7),

	MAX1027_V_CHAN(8),

	MAX1027_V_CHAN(9),

	MAX1027_V_CHAN(10),

	MAX1027_V_CHAN(11),

	MAX1027_V_CHAN(12),

	MAX1027_V_CHAN(13),

	MAX1027_V_CHAN(14),

	MAX1027_V_CHAN(15)

	MAX1X31_CHANNELS(10),

};



static const unsigned long max1027_available_scan_masks[] = {
@@ -284,7 +274,7 @@ static int max1027_read_raw(struct iio_dev *indio_dev, 
			break;

		case IIO_VOLTAGE:

			*val = 2500;

			*val2 = 10;

			*val2 = chan->scan_type.realbits;

			ret = IIO_VAL_FRACTIONAL_LOG2;

			break;

		default:

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