From: Liam Beguin <liambeguin@gmail.com>
To: liambeguin@gmail.com, lars@metafoo.de,
Michael.Hennerich@analog.com, jic23@kernel.org,
charles-antoine.couret@essensium.com, Nuno.Sa@analog.com
Cc: linux-kernel@vger.kernel.org, linux-iio@vger.kernel.org,
devicetree@vger.kernel.org, robh+dt@kernel.org
Subject: [PATCH v2 1/4] iio: adc: ad7949: define and use bitfield names
Date: Fri, 9 Jul 2021 11:58:53 -0400 [thread overview]
Message-ID: <20210709155856.1732245-2-liambeguin@gmail.com> (raw)
In-Reply-To: <20210709155856.1732245-1-liambeguin@gmail.com>
From: Liam Beguin <lvb@xiphos.com>
Replace raw configuration register values by using FIELD_PREP and
defines to improve readability.
Signed-off-by: Liam Beguin <lvb@xiphos.com>
---
drivers/iio/adc/ad7949.c | 38 +++++++++++++++++++++++++++++++-------
1 file changed, 31 insertions(+), 7 deletions(-)
diff --git a/drivers/iio/adc/ad7949.c b/drivers/iio/adc/ad7949.c
index 1b4b3203e428..93aacf4f680b 100644
--- a/drivers/iio/adc/ad7949.c
+++ b/drivers/iio/adc/ad7949.c
@@ -12,12 +12,27 @@
#include <linux/regulator/consumer.h>
#include <linux/spi/spi.h>
-#define AD7949_MASK_CHANNEL_SEL GENMASK(9, 7)
#define AD7949_MASK_TOTAL GENMASK(13, 0)
-#define AD7949_OFFSET_CHANNEL_SEL 7
-#define AD7949_CFG_READ_BACK 0x1
#define AD7949_CFG_REG_SIZE_BITS 14
+#define AD7949_CFG_BIT_CFG BIT(13)
+#define AD7949_CFG_VAL_CFG_OVERWRITE 1
+#define AD7949_CFG_VAL_CFG_KEEP 0
+#define AD7949_CFG_BIT_INCC GENMASK(12, 10)
+#define AD7949_CFG_VAL_INCC_UNIPOLAR_GND 7
+#define AD7949_CFG_VAL_INCC_UNIPOLAR_COMM 6
+#define AD7949_CFG_VAL_INCC_UNIPOLAR_DIFF 4
+#define AD7949_CFG_VAL_INCC_TEMP 3
+#define AD7949_CFG_VAL_INCC_BIPOLAR 2
+#define AD7949_CFG_VAL_INCC_BIPOLAR_DIFF 0
+#define AD7949_CFG_BIT_INX GENMASK(9, 7)
+#define AD7949_CFG_BIT_BW BIT(6)
+#define AD7949_CFG_VAL_BW_FULL 1
+#define AD7949_CFG_VAL_BW_QUARTER 0
+#define AD7949_CFG_BIT_REF GENMASK(5, 3)
+#define AD7949_CFG_BIT_SEQ GENMASK(2, 1)
+#define AD7949_CFG_BIT_RBN BIT(0)
+
enum {
ID_AD7949 = 0,
ID_AD7682,
@@ -109,8 +124,8 @@ static int ad7949_spi_read_channel(struct ad7949_adc_chip *ad7949_adc, int *val,
*/
for (i = 0; i < 2; i++) {
ret = ad7949_spi_write_cfg(ad7949_adc,
- channel << AD7949_OFFSET_CHANNEL_SEL,
- AD7949_MASK_CHANNEL_SEL);
+ FIELD_PREP(AD7949_CFG_BIT_INX, channel),
+ AD7949_CFG_BIT_INX);
if (ret)
return ret;
if (channel == ad7949_adc->current_channel)
@@ -214,10 +229,19 @@ static int ad7949_spi_init(struct ad7949_adc_chip *ad7949_adc)
{
int ret;
int val;
+ u16 cfg;
- /* Sequencer disabled, CFG readback disabled, IN0 as default channel */
ad7949_adc->current_channel = 0;
- ret = ad7949_spi_write_cfg(ad7949_adc, 0x3C79, AD7949_MASK_TOTAL);
+
+ cfg = FIELD_PREP(AD7949_CFG_BIT_CFG, AD7949_CFG_VAL_CFG_OVERWRITE) |
+ FIELD_PREP(AD7949_CFG_BIT_INCC, AD7949_CFG_VAL_INCC_UNIPOLAR_GND) |
+ FIELD_PREP(AD7949_CFG_BIT_INX, ad7949_adc->current_channel) |
+ FIELD_PREP(AD7949_CFG_BIT_BW, AD7949_CFG_VAL_BW_FULL) |
+ FIELD_PREP(AD7949_CFG_BIT_REF, AD7949_REF_EXT_BUF) |
+ FIELD_PREP(AD7949_CFG_BIT_SEQ, 0x0) |
+ FIELD_PREP(AD7949_CFG_BIT_RBN, 1);
+
+ ret = ad7949_spi_write_cfg(ad7949_adc, cfg, AD7949_MASK_TOTAL);
/*
* Do two dummy conversions to apply the first configuration setting.
--
2.30.1.489.g328c10930387
next prev parent reply other threads:[~2021-07-09 15:59 UTC|newest]
Thread overview: 14+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-07-09 15:58 [PATCH v1 0/4] AD7949 Fixes Liam Beguin
2021-07-09 15:58 ` Liam Beguin [this message]
2021-07-10 16:08 ` [PATCH v2 1/4] iio: adc: ad7949: define and use bitfield names Jonathan Cameron
2021-07-10 18:17 ` Liam Beguin
2021-07-09 15:58 ` [PATCH v2 2/4] iio: adc: ad7949: fix spi messages on non 14-bit controllers Liam Beguin
2021-07-10 16:39 ` Jonathan Cameron
2021-07-11 19:58 ` Liam Beguin
2021-07-12 10:12 ` Jonathan Cameron
2021-07-09 15:58 ` [PATCH v2 3/4] iio: adc: ad7949: add support for internal vref Liam Beguin
2021-07-10 17:03 ` Jonathan Cameron
2021-07-09 15:58 ` [PATCH v2 4/4] dt-bindings: iio: adc: ad7949: add adi,reference-source Liam Beguin
2021-07-10 17:00 ` Jonathan Cameron
2021-07-12 17:05 ` Liam Beguin
2021-07-13 9:16 ` Jonathan Cameron
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