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path: root/drivers/iio/adc/ad7949.c
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Diffstat (limited to 'drivers/iio/adc/ad7949.c')
-rw-r--r--drivers/iio/adc/ad7949.c33
1 files changed, 6 insertions, 27 deletions
diff --git a/drivers/iio/adc/ad7949.c b/drivers/iio/adc/ad7949.c
index ac0ffff6c5ae..5c2b3446fa4a 100644
--- a/drivers/iio/adc/ad7949.c
+++ b/drivers/iio/adc/ad7949.c
@@ -54,38 +54,20 @@ struct ad7949_adc_chip {
u8 resolution;
u16 cfg;
unsigned int current_channel;
- u32 buffer ____cacheline_aligned;
+ u16 buffer ____cacheline_aligned;
};
-static bool ad7949_spi_cfg_is_read_back(struct ad7949_adc_chip *ad7949_adc)
-{
- if (!(ad7949_adc->cfg & AD7949_CFG_READ_BACK))
- return true;
-
- return false;
-}
-
-static int ad7949_spi_bits_per_word(struct ad7949_adc_chip *ad7949_adc)
-{
- int ret = ad7949_adc->resolution;
-
- if (ad7949_spi_cfg_is_read_back(ad7949_adc))
- ret += AD7949_CFG_REG_SIZE_BITS;
-
- return ret;
-}
-
static int ad7949_spi_write_cfg(struct ad7949_adc_chip *ad7949_adc, u16 val,
u16 mask)
{
int ret;
- int bits_per_word = ad7949_spi_bits_per_word(ad7949_adc);
+ int bits_per_word = ad7949_adc->resolution;
int shift = bits_per_word - AD7949_CFG_REG_SIZE_BITS;
struct spi_message msg;
struct spi_transfer tx[] = {
{
.tx_buf = &ad7949_adc->buffer,
- .len = 4,
+ .len = 2,
.bits_per_word = bits_per_word,
},
};
@@ -107,13 +89,13 @@ static int ad7949_spi_read_channel(struct ad7949_adc_chip *ad7949_adc, int *val,
unsigned int channel)
{
int ret;
- int bits_per_word = ad7949_spi_bits_per_word(ad7949_adc);
+ int bits_per_word = ad7949_adc->resolution;
int mask = GENMASK(ad7949_adc->resolution, 0);
struct spi_message msg;
struct spi_transfer tx[] = {
{
.rx_buf = &ad7949_adc->buffer,
- .len = 4,
+ .len = 2,
.bits_per_word = bits_per_word,
},
};
@@ -138,10 +120,7 @@ static int ad7949_spi_read_channel(struct ad7949_adc_chip *ad7949_adc, int *val,
ad7949_adc->current_channel = channel;
- if (ad7949_spi_cfg_is_read_back(ad7949_adc))
- *val = (ad7949_adc->buffer >> AD7949_CFG_REG_SIZE_BITS) & mask;
- else
- *val = ad7949_adc->buffer & mask;
+ *val = ad7949_adc->buffer & mask;
return 0;
}