[PATCH v3 1/4] iio: adc: ad9467: wrap a axi-adc chip-info into a ad9467_chip_info type

Alexandru Ardelean
2020-09-24T08:05:41Z

There are 2 chip constants that can be added to the chip-info part. The
default output-mode and the VREF mask.

When adding new chips to this driver, these can be easily omitted, because
these also need to be updated in 2 switch statements.

However, if adding them in the chip-info constants, they are updated in a
single place and propagated in both switch statements.

Signed-off-by: Alexandru Ardelean <alexandru.ardelean@analog.com>
---
drivers/iio/adc/ad9467.c | 62 +++++++++++++++++++---------------------
1 file changed, 29 insertions(+), 33 deletions(-)

diff --git a/drivers/iio/adc/ad9467.c b/drivers/iio/adc/ad9467.c
index f068256cfca9..85f5a014bd2d 100644
--- a/drivers/iio/adc/ad9467.c
+++ b/drivers/iio/adc/ad9467.c
@@ -88,6 +88,15 @@ enum {
ID_AD9467,
};

+struct ad9467_chip_info {
+ struct adi_axi_adc_chip_info axi_adc_info;
+ unsigned int default_output_mode;
+ unsigned int vref_mask;
+};
+
+#define to_ad9467_chip_info(_info) \
+ container_of(_info, struct ad9467_chip_info, axi_adc_info)
+
struct ad9467_state {
struct spi_device *spi;
struct clk *clk;
@@ -186,35 +195,31 @@ static const struct iio_chan_spec ad9467_channels[] = {
AD9467_CHAN(0, 0, 16, 'S'),
};

-static const struct adi_axi_adc_chip_info ad9467_chip_tbl[] = {
+static const struct ad9467_chip_info ad9467_chip_tbl[] = {
[ID_AD9467] = {
- .id = CHIPID_AD9467,
- .max_rate = 250000000UL,
- .scale_table = ad9467_scale_table,
- .num_scales = ARRAY_SIZE(ad9467_scale_table),
- .channels = ad9467_channels,
- .num_channels = ARRAY_SIZE(ad9467_channels),
+ .axi_adc_info = {
+ .id = CHIPID_AD9467,
+ .max_rate = 250000000UL,
+ .scale_table = ad9467_scale_table,
+ .num_scales = ARRAY_SIZE(ad9467_scale_table),
+ .channels = ad9467_channels,
+ .num_channels = ARRAY_SIZE(ad9467_channels),
+ },
+ .default_output_mode = AD9467_DEF_OUTPUT_MODE,
+ .vref_mask = AD9467_REG_VREF_MASK,
},
};

static int ad9467_get_scale(struct adi_axi_adc_conv *conv, int *val, int *val2)
{
const struct adi_axi_adc_chip_info *info = conv->chip_info;
+ const struct ad9467_chip_info *info1 = to_ad9467_chip_info(info);
struct ad9467_state *st = adi_axi_adc_conv_priv(conv);
- unsigned int i, vref_val, vref_mask;
+ unsigned int i, vref_val;

vref_val = ad9467_spi_read(st->spi, AN877_ADC_REG_VREF);

- switch (info->id) {
- case CHIPID_AD9467:
- vref_mask = AD9467_REG_VREF_MASK;
- break;
- default:
- vref_mask = 0xFFFF;
- break;
- }
-
- vref_val &= vref_mask;
+ vref_val &= info1->vref_mask;

for (i = 0; i < info->num_scales; i++) {
if (vref_val == info->scale_table[i][1])
@@ -316,18 +321,6 @@ static int ad9467_preenable_setup(struct adi_axi_adc_conv *conv)
return ad9467_outputmode_set(st->spi, st->output_mode);
}

-static int ad9467_setup(struct ad9467_state *st, unsigned int chip_id)
-{
- switch (chip_id) {
- case CHIPID_AD9467:
- st->output_mode = AD9467_DEF_OUTPUT_MODE |
- AN877_ADC_OUTPUT_MODE_TWOS_COMPLEMENT;
- return 0;
- default:
- return -ENODEV;
- }
-}
-
static void ad9467_clk_disable(void *data)
{
struct ad9467_state *st = data;
@@ -337,7 +330,7 @@ static void ad9467_clk_disable(void *data)

static int ad9467_probe(struct spi_device *spi)
{
- const struct adi_axi_adc_chip_info *info;
+ const struct ad9467_chip_info *info;
struct adi_axi_adc_conv *conv;
struct ad9467_state *st;
unsigned int id;
@@ -386,7 +379,7 @@ static int ad9467_probe(struct spi_device *spi)

spi_set_drvdata(spi, st);

- conv->chip_info = info;
+ conv->chip_info = &info->axi_adc_info;

id = ad9467_spi_read(spi, AN877_ADC_REG_CHIP_ID);
if (id != conv->chip_info->id) {
@@ -400,7 +393,10 @@ static int ad9467_probe(struct spi_device *spi)
conv->read_raw = ad9467_read_raw;
conv->preenable_setup = ad9467_preenable_setup;

- return ad9467_setup(st, id);
+ st->output_mode = info->default_output_mode |
+ AN877_ADC_OUTPUT_MODE_TWOS_COMPLEMENT;
+
+ return 0;