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staging:iio:adc:ad7280a: Use bitfield ops to managed fields in transfers.

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The write and two types of read transfer are sufficiently complex that
they benefit from the clarity of using FIELD_PREP() and FIELD_GET().
This also applies to the handling in ad7280_event_handler() so
use a similar approach there as well.

Signed-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>
Reviewed-by: Marcelo Schmitt <marcelo.schmitt1@gmail.com>
Link: https://lore.kernel.org/r/20220206190328.333093-6-jic23@kernel.org
This commit is contained in:
Jonathan Cameron 2022-02-06 19:03:13 +00:00
parent 003f1d48de
commit 4915c6b3dd
1 changed files with 45 additions and 19 deletions
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64
drivers/staging/iio/adc/ad7280a.c
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@ -95,6 +95,23 @@
#define AD7280A_READ_ADDR_MSK GENMASK(7, 2)
#define AD7280A_CNVST_CTRL_REG 0x1D /* D7 to D0, Read/write */
/* Transfer fields */
#define AD7280A_TRANS_WRITE_DEVADDR_MSK GENMASK(31, 27)
#define AD7280A_TRANS_WRITE_ADDR_MSK GENMASK(26, 21)
#define AD7280A_TRANS_WRITE_VAL_MSK GENMASK(20, 13)
#define AD7280A_TRANS_WRITE_ALL_MSK BIT(12)
#define AD7280A_TRANS_WRITE_CRC_MSK GENMASK(10, 3)
#define AD7280A_TRANS_WRITE_RES_PATTERN 0x2
/* Layouts differ for channel vs other registers */
#define AD7280A_TRANS_READ_DEVADDR_MSK GENMASK(31, 27)
#define AD7280A_TRANS_READ_CONV_CHANADDR_MSK GENMASK(26, 23)
#define AD7280A_TRANS_READ_CONV_DATA_MSK GENMASK(22, 11)
#define AD7280A_TRANS_READ_REG_REGADDR_MSK GENMASK(26, 21)
#define AD7280A_TRANS_READ_REG_DATA_MSK GENMASK(20, 13)
#define AD7280A_TRANS_READ_WRITE_ACK_MSK BIT(10)
#define AD7280A_TRANS_READ_CRC_MSK GENMASK(9, 2)
/* Magic value used to indicate this special case */
#define AD7280A_ALL_CELLS (0xAD << 16)
@ -216,10 +233,16 @@ static int __ad7280_read32(struct ad7280_state *st, unsigned int *val)
static int ad7280_write(struct ad7280_state *st, unsigned int devaddr,
unsigned int addr, bool all, unsigned int val)
{
unsigned int reg = devaddr << 27 | addr << 21 |
(val & 0xFF) << 13 | all << 12;
unsigned int reg = FIELD_PREP(AD7280A_TRANS_WRITE_DEVADDR_MSK, devaddr) |
FIELD_PREP(AD7280A_TRANS_WRITE_ADDR_MSK, addr) |
FIELD_PREP(AD7280A_TRANS_WRITE_VAL_MSK, val) |
FIELD_PREP(AD7280A_TRANS_WRITE_ALL_MSK, all);
reg |= FIELD_PREP(AD7280A_TRANS_WRITE_CRC_MSK,
ad7280_calc_crc8(st->crc_tab, reg >> 11));
/* Reserved b010 pattern not included crc calc */
reg |= AD7280A_TRANS_WRITE_RES_PATTERN;
reg |= ad7280_calc_crc8(st->crc_tab, reg >> 11) << 3 | 0x2;
st->tx = cpu_to_be32(reg);
return spi_write(st->spi, &st->tx, sizeof(st->tx));
@ -264,10 +287,11 @@ static int ad7280_read_reg(struct ad7280_state *st, unsigned int devaddr,
if (ad7280_check_crc(st, tmp))
return -EIO;
if (((tmp >> 27) != devaddr) || (((tmp >> 21) & 0x3F) != addr))
if ((FIELD_GET(AD7280A_TRANS_READ_DEVADDR_MSK, tmp) != devaddr) ||
(FIELD_GET(AD7280A_TRANS_READ_REG_REGADDR_MSK, tmp) != addr))
return -EFAULT;
return (tmp >> 13) & 0xFF;
return FIELD_GET(AD7280A_TRANS_READ_REG_DATA_MSK, tmp);
}
static int ad7280_read_channel(struct ad7280_state *st, unsigned int devaddr,
@ -310,10 +334,11 @@ static int ad7280_read_channel(struct ad7280_state *st, unsigned int devaddr,
if (ad7280_check_crc(st, tmp))
return -EIO;
if (((tmp >> 27) != devaddr) || (((tmp >> 23) & 0xF) != addr))
if ((FIELD_GET(AD7280A_TRANS_READ_DEVADDR_MSK, tmp) != devaddr) ||
(FIELD_GET(AD7280A_TRANS_READ_CONV_CHANADDR_MSK, tmp) != addr))
return -EFAULT;
return (tmp >> 11) & 0xFFF;
return FIELD_GET(AD7280A_TRANS_READ_CONV_DATA_MSK, tmp);
}
static int ad7280_read_all_channels(struct ad7280_state *st, unsigned int cnt,
@ -351,8 +376,9 @@ static int ad7280_read_all_channels(struct ad7280_state *st, unsigned int cnt,
if (array)
array[i] = tmp;
/* only sum cell voltages */
if (((tmp >> 23) & 0xF) <= AD7280A_CELL_VOLTAGE_6_REG)
sum += ((tmp >> 11) & 0xFFF);
if (FIELD_GET(AD7280A_TRANS_READ_CONV_CHANADDR_MSK, tmp) <=
AD7280A_CELL_VOLTAGE_6_REG)
sum += FIELD_GET(AD7280A_TRANS_READ_CONV_DATA_MSK, tmp);
}
return sum;
@ -407,7 +433,7 @@ static int ad7280_chain_setup(struct ad7280_state *st)
goto error_power_down;
}
if (n != ad7280a_devaddr(val >> 27)) {
if (n != ad7280a_devaddr(FIELD_GET(AD7280A_TRANS_READ_DEVADDR_MSK, val))) {
ret = -EIO;
goto error_power_down;
}
@ -806,17 +832,19 @@ static irqreturn_t ad7280_event_handler(int irq, void *private)
goto out;
for (i = 0; i < st->scan_cnt; i++) {
if (((channels[i] >> 23) & 0xF) <= AD7280A_CELL_VOLTAGE_6_REG) {
if (((channels[i] >> 11) & 0xFFF) >=
st->cell_threshhigh) {
unsigned int val;
val = FIELD_GET(AD7280A_TRANS_READ_CONV_DATA_MSK, channels[i]);
if (FIELD_GET(AD7280A_TRANS_READ_CONV_CHANADDR_MSK, channels[i]) <=
AD7280A_CELL_VOLTAGE_6_REG) {
if (val >= st->cell_threshhigh) {
u64 tmp = IIO_EVENT_CODE(IIO_VOLTAGE, 1, 0,
IIO_EV_DIR_RISING,
IIO_EV_TYPE_THRESH,
0, 0, 0);
iio_push_event(indio_dev, tmp,
iio_get_time_ns(indio_dev));
} else if (((channels[i] >> 11) & 0xFFF) <=
st->cell_threshlow) {
} else if (val <= st->cell_threshlow) {
u64 tmp = IIO_EVENT_CODE(IIO_VOLTAGE, 1, 0,
IIO_EV_DIR_FALLING,
IIO_EV_TYPE_THRESH,
@ -825,15 +853,13 @@ static irqreturn_t ad7280_event_handler(int irq, void *private)
iio_get_time_ns(indio_dev));
}
} else {
if (((channels[i] >> 11) & 0xFFF) >=
st->aux_threshhigh) {
if (val >= st->aux_threshhigh) {
u64 tmp = IIO_UNMOD_EVENT_CODE(IIO_TEMP, 0,
IIO_EV_TYPE_THRESH,
IIO_EV_DIR_RISING);
iio_push_event(indio_dev, tmp,
iio_get_time_ns(indio_dev));
} else if (((channels[i] >> 11) & 0xFFF) <=
st->aux_threshlow) {
} else if (val <= st->aux_threshlow) {
u64 tmp = IIO_UNMOD_EVENT_CODE(IIO_TEMP, 0,
IIO_EV_TYPE_THRESH,
IIO_EV_DIR_FALLING);