From: Jonathan Cameron <Jonathan.Cameron@xxxxxxxxxx>
The write and two types of read transfer are sufficiently complex that
they benefit from the clarity of using FIELD_PREP() and FIELD_GET()
Signed-off-by: Jonathan Cameron <Jonathan.Cameron@xxxxxxxxxx>
---
drivers/staging/iio/adc/ad7280a.c | 46 ++++++++++++++++++++++++-------
1 file changed, 36 insertions(+), 10 deletions(-)
diff --git a/drivers/staging/iio/adc/ad7280a.c b/drivers/staging/iio/adc/ad7280a.c
index 1f7ea5fb1e20..158a792c0bf8 100644
--- a/drivers/staging/iio/adc/ad7280a.c
+++ b/drivers/staging/iio/adc/ad7280a.c
@@ -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;
}
--
2.32.0
