[PATCH v3 1/3] iio: adc: ad7192: Use bitfield access macros

From: alisadariana
Date: Sun Sep 24 2023 - 17:52:33 EST

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From: Alisa-Dariana Roman <alisa.roman@xxxxxxxxxx>

Include bitfield.h and update driver to use bitfield access macros
GENMASK, FIELD_PREP and FIELD_GET.

Remove old macros in favor of using FIELD_PREP and masks.

Change %d to %ld to match the type of FIELD_GET().

Signed-off-by: Alisa-Dariana Roman <alisa.roman@xxxxxxxxxx>
---
drivers/iio/adc/ad7192.c | 73 ++++++++++++++++++++--------------------
1 file changed, 37 insertions(+), 36 deletions(-)

diff --git a/drivers/iio/adc/ad7192.c b/drivers/iio/adc/ad7192.c
index 69d1103b9508..d693f2ce8a20 100644
--- a/drivers/iio/adc/ad7192.c
+++ b/drivers/iio/adc/ad7192.c
@@ -6,6 +6,7 @@
*/

#include <linux/interrupt.h>
+#include <linux/bitfield.h>
#include <linux/clk.h>
#include <linux/device.h>
#include <linux/kernel.h>
@@ -43,7 +44,7 @@
#define AD7192_COMM_WEN BIT(7) /* Write Enable */
#define AD7192_COMM_WRITE 0 /* Write Operation */
#define AD7192_COMM_READ BIT(6) /* Read Operation */
-#define AD7192_COMM_ADDR(x) (((x) & 0x7) << 3) /* Register Address */
+#define AD7192_COMM_ADDR_MASK GENMASK(5, 3) /* Register Address Mask */
#define AD7192_COMM_CREAD BIT(2) /* Continuous Read of Data Register */

/* Status Register Bit Designations (AD7192_REG_STAT) */
@@ -56,17 +57,16 @@
#define AD7192_STAT_CH1 BIT(0) /* Channel 1 */

/* Mode Register Bit Designations (AD7192_REG_MODE) */
-#define AD7192_MODE_SEL(x) (((x) & 0x7) << 21) /* Operation Mode Select */
-#define AD7192_MODE_SEL_MASK (0x7 << 21) /* Operation Mode Select Mask */
-#define AD7192_MODE_STA(x) (((x) & 0x1) << 20) /* Status Register transmission */
+#define AD7192_MODE_SEL_MASK GENMASK(23, 21) /* Operation Mode Select Mask */
#define AD7192_MODE_STA_MASK BIT(20) /* Status Register transmission Mask */
-#define AD7192_MODE_CLKSRC(x) (((x) & 0x3) << 18) /* Clock Source Select */
+#define AD7192_MODE_CLKSRC_MASK GENMASK(19, 18) /* Clock Source Select Mask */
#define AD7192_MODE_SINC3 BIT(15) /* SINC3 Filter Select */
#define AD7192_MODE_ENPAR BIT(13) /* Parity Enable */
#define AD7192_MODE_CLKDIV BIT(12) /* Clock divide by 2 (AD7190/2 only)*/
#define AD7192_MODE_SCYCLE BIT(11) /* Single cycle conversion */
#define AD7192_MODE_REJ60 BIT(10) /* 50/60Hz notch filter */
-#define AD7192_MODE_RATE(x) ((x) & 0x3FF) /* Filter Update Rate Select */
+ /* Filter Update Rate Select Mask */
+#define AD7192_MODE_RATE_MASK GENMASK(9, 0)

/* Mode Register: AD7192_MODE_SEL options */
#define AD7192_MODE_CONT 0 /* Continuous Conversion Mode */
@@ -92,13 +92,12 @@
#define AD7192_CONF_CHOP BIT(23) /* CHOP enable */
#define AD7192_CONF_ACX BIT(22) /* AC excitation enable(AD7195 only) */
#define AD7192_CONF_REFSEL BIT(20) /* REFIN1/REFIN2 Reference Select */
-#define AD7192_CONF_CHAN(x) ((x) << 8) /* Channel select */
-#define AD7192_CONF_CHAN_MASK (0x7FF << 8) /* Channel select mask */
+#define AD7192_CONF_CHAN_MASK GENMASK(18, 8) /* Channel select mask */
#define AD7192_CONF_BURN BIT(7) /* Burnout current enable */
#define AD7192_CONF_REFDET BIT(6) /* Reference detect enable */
#define AD7192_CONF_BUF BIT(4) /* Buffered Mode Enable */
#define AD7192_CONF_UNIPOLAR BIT(3) /* Unipolar/Bipolar Enable */
-#define AD7192_CONF_GAIN(x) ((x) & 0x7) /* Gain Select */
+#define AD7192_CONF_GAIN_MASK GENMASK(2, 0) /* Gain Select */

#define AD7192_CH_AIN1P_AIN2M BIT(0) /* AIN1(+) - AIN2(-) */
#define AD7192_CH_AIN3P_AIN4M BIT(1) /* AIN3(+) - AIN4(-) */
@@ -130,7 +129,7 @@
#define CHIPID_AD7192 0x0
#define CHIPID_AD7193 0x2
#define CHIPID_AD7195 0x6
-#define AD7192_ID_MASK 0x0F
+#define AD7192_ID_MASK GENMASK(3, 0)

/* GPOCON Register Bit Designations (AD7192_REG_GPOCON) */
#define AD7192_GPOCON_BPDSW BIT(6) /* Bridge power-down switch enable */
@@ -272,7 +271,7 @@ static int ad7192_set_channel(struct ad_sigma_delta *sd, unsigned int channel)
struct ad7192_state *st = ad_sigma_delta_to_ad7192(sd);

st->conf &= ~AD7192_CONF_CHAN_MASK;
- st->conf |= AD7192_CONF_CHAN(channel);
+ st->conf |= FIELD_PREP(AD7192_CONF_CHAN_MASK, channel);

return ad_sd_write_reg(&st->sd, AD7192_REG_CONF, 3, st->conf);
}
@@ -283,7 +282,7 @@ static int ad7192_set_mode(struct ad_sigma_delta *sd,
struct ad7192_state *st = ad_sigma_delta_to_ad7192(sd);

st->mode &= ~AD7192_MODE_SEL_MASK;
- st->mode |= AD7192_MODE_SEL(mode);
+ st->mode |= FIELD_PREP(AD7192_MODE_SEL_MASK, mode);

return ad_sd_write_reg(&st->sd, AD7192_REG_MODE, 3, st->mode);
}
@@ -295,7 +294,7 @@ static int ad7192_append_status(struct ad_sigma_delta *sd, bool append)
int ret;

mode &= ~AD7192_MODE_STA_MASK;
- mode |= AD7192_MODE_STA(append);
+ mode |= FIELD_PREP(AD7192_MODE_STA_MASK, append);

ret = ad_sd_write_reg(&st->sd, AD7192_REG_MODE, 3, mode);
if (ret < 0)
@@ -399,17 +398,17 @@ static int ad7192_setup(struct iio_dev *indio_dev, struct device_node *np)
if (ret)
return ret;

- id &= AD7192_ID_MASK;
+ id = FIELD_GET(AD7192_ID_MASK, id);

if (id != st->chip_info->chip_id)
dev_warn(&st->sd.spi->dev, "device ID query failed (0x%X != 0x%X)\n",
id, st->chip_info->chip_id);

- st->mode = AD7192_MODE_SEL(AD7192_MODE_IDLE) |
- AD7192_MODE_CLKSRC(st->clock_sel) |
- AD7192_MODE_RATE(480);
+ st->mode = FIELD_PREP(AD7192_MODE_SEL_MASK, AD7192_MODE_IDLE) |
+ FIELD_PREP(AD7192_MODE_CLKSRC_MASK, st->clock_sel) |
+ FIELD_PREP(AD7192_MODE_RATE_MASK, 480);

- st->conf = AD7192_CONF_GAIN(0);
+ st->conf = FIELD_PREP(AD7192_CONF_GAIN_MASK, 0);

rej60_en = of_property_read_bool(np, "adi,rejection-60-Hz-enable");
if (rej60_en)
@@ -455,7 +454,7 @@ static int ad7192_setup(struct iio_dev *indio_dev, struct device_node *np)
for (i = 0; i < ARRAY_SIZE(st->scale_avail); i++) {
scale_uv = ((u64)st->int_vref_mv * 100000000)
>> (indio_dev->channels[0].scan_type.realbits -
- ((st->conf & AD7192_CONF_UNIPOLAR) ? 0 : 1));
+ !FIELD_GET(AD7192_CONF_UNIPOLAR, st->conf));
scale_uv >>= i;

st->scale_avail[i][1] = do_div(scale_uv, 100000000) * 10;
@@ -472,7 +471,7 @@ static ssize_t ad7192_show_ac_excitation(struct device *dev,
struct iio_dev *indio_dev = dev_to_iio_dev(dev);
struct ad7192_state *st = iio_priv(indio_dev);

- return sysfs_emit(buf, "%d\n", !!(st->conf & AD7192_CONF_ACX));
+ return sysfs_emit(buf, "%ld\n", FIELD_GET(AD7192_CONF_ACX, st->conf));
}

static ssize_t ad7192_show_bridge_switch(struct device *dev,
@@ -482,7 +481,8 @@ static ssize_t ad7192_show_bridge_switch(struct device *dev,
struct iio_dev *indio_dev = dev_to_iio_dev(dev);
struct ad7192_state *st = iio_priv(indio_dev);

- return sysfs_emit(buf, "%d\n", !!(st->gpocon & AD7192_GPOCON_BPDSW));
+ return sysfs_emit(buf, "%ld\n",
+ FIELD_GET(AD7192_GPOCON_BPDSW, st->gpocon));
}

static ssize_t ad7192_set(struct device *dev,
@@ -537,14 +537,14 @@ static void ad7192_get_available_filter_freq(struct ad7192_state *st,

/* Formulas for filter at page 25 of the datasheet */
fadc = DIV_ROUND_CLOSEST(st->fclk,
- AD7192_SYNC4_FILTER * AD7192_MODE_RATE(st->mode));
+ AD7192_SYNC4_FILTER * FIELD_GET(AD7192_MODE_RATE_MASK, st->mode));
freq[0] = DIV_ROUND_CLOSEST(fadc * 240, 1024);

fadc = DIV_ROUND_CLOSEST(st->fclk,
- AD7192_SYNC3_FILTER * AD7192_MODE_RATE(st->mode));
+ AD7192_SYNC3_FILTER * FIELD_GET(AD7192_MODE_RATE_MASK, st->mode));
freq[1] = DIV_ROUND_CLOSEST(fadc * 240, 1024);

- fadc = DIV_ROUND_CLOSEST(st->fclk, AD7192_MODE_RATE(st->mode));
+ fadc = DIV_ROUND_CLOSEST(st->fclk, FIELD_GET(AD7192_MODE_RATE_MASK, st->mode));
freq[2] = DIV_ROUND_CLOSEST(fadc * 230, 1024);
freq[3] = DIV_ROUND_CLOSEST(fadc * 272, 1024);
}
@@ -665,11 +665,11 @@ static int ad7192_get_3db_filter_freq(struct ad7192_state *st)
unsigned int fadc;

fadc = DIV_ROUND_CLOSEST(st->fclk,
- st->f_order * AD7192_MODE_RATE(st->mode));
+ st->f_order * FIELD_GET(AD7192_MODE_RATE_MASK, st->mode));

- if (st->conf & AD7192_CONF_CHOP)
+ if (FIELD_GET(AD7192_CONF_CHOP, st->conf))
return DIV_ROUND_CLOSEST(fadc * 240, 1024);
- if (st->mode & AD7192_MODE_SINC3)
+ if (FIELD_GET(AD7192_MODE_SINC3, st->mode))
return DIV_ROUND_CLOSEST(fadc * 272, 1024);
else
return DIV_ROUND_CLOSEST(fadc * 230, 1024);
@@ -682,7 +682,8 @@ static int ad7192_read_raw(struct iio_dev *indio_dev,
long m)
{
struct ad7192_state *st = iio_priv(indio_dev);
- bool unipolar = !!(st->conf & AD7192_CONF_UNIPOLAR);
+ bool unipolar = !!FIELD_GET(AD7192_CONF_UNIPOLAR, st->conf);
+ u8 gain = FIELD_GET(AD7192_CONF_GAIN_MASK, st->conf);

switch (m) {
case IIO_CHAN_INFO_RAW:
@@ -691,8 +692,8 @@ static int ad7192_read_raw(struct iio_dev *indio_dev,
switch (chan->type) {
case IIO_VOLTAGE:
mutex_lock(&st->lock);
- *val = st->scale_avail[AD7192_CONF_GAIN(st->conf)][0];
- *val2 = st->scale_avail[AD7192_CONF_GAIN(st->conf)][1];
+ *val = st->scale_avail[gain][0];
+ *val2 = st->scale_avail[gain][1];
mutex_unlock(&st->lock);
return IIO_VAL_INT_PLUS_NANO;
case IIO_TEMP:
@@ -713,7 +714,7 @@ static int ad7192_read_raw(struct iio_dev *indio_dev,
return IIO_VAL_INT;
case IIO_CHAN_INFO_SAMP_FREQ:
*val = st->fclk /
- (st->f_order * 1024 * AD7192_MODE_RATE(st->mode));
+ (st->f_order * 1024 * FIELD_GET(AD7192_MODE_RATE_MASK, st->mode));
return IIO_VAL_INT;
case IIO_CHAN_INFO_LOW_PASS_FILTER_3DB_FREQUENCY:
*val = ad7192_get_3db_filter_freq(st);
@@ -746,8 +747,8 @@ static int ad7192_write_raw(struct iio_dev *indio_dev,
if (val2 == st->scale_avail[i][1]) {
ret = 0;
tmp = st->conf;
- st->conf &= ~AD7192_CONF_GAIN(-1);
- st->conf |= AD7192_CONF_GAIN(i);
+ st->conf &= ~AD7192_CONF_GAIN_MASK;
+ st->conf |= FIELD_PREP(AD7192_CONF_GAIN_MASK, i);
if (tmp == st->conf)
break;
ad_sd_write_reg(&st->sd, AD7192_REG_CONF,
@@ -769,8 +770,8 @@ static int ad7192_write_raw(struct iio_dev *indio_dev,
break;
}

- st->mode &= ~AD7192_MODE_RATE(-1);
- st->mode |= AD7192_MODE_RATE(div);
+ st->mode &= ~AD7192_MODE_RATE_MASK;
+ st->mode |= FIELD_PREP(AD7192_MODE_RATE_MASK, div);
ad_sd_write_reg(&st->sd, AD7192_REG_MODE, 3, st->mode);
break;
case IIO_CHAN_INFO_LOW_PASS_FILTER_3DB_FREQUENCY:
@@ -830,7 +831,7 @@ static int ad7192_update_scan_mode(struct iio_dev *indio_dev, const unsigned lon

conf &= ~AD7192_CONF_CHAN_MASK;
for_each_set_bit(i, scan_mask, 8)
- conf |= AD7192_CONF_CHAN(i);
+ conf |= FIELD_PREP(AD7192_CONF_CHAN_MASK, i);

ret = ad_sd_write_reg(&st->sd, AD7192_REG_CONF, 3, conf);
if (ret < 0)
--
2.34.1

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