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Subject[PATCH v2 7/8] staging:iio:ade7854: Rework SPI read function
Rework read SPI function to reduce the code duplication and centralizes
all the task in a single function.

Signed-off-by: Rodrigo Siqueira <rodrigosiqueiramelo@gmail.com>
---
drivers/staging/iio/meter/ade7854-spi.c | 140 +++++++++-----------------------
1 file changed, 37 insertions(+), 103 deletions(-)

diff --git a/drivers/staging/iio/meter/ade7854-spi.c b/drivers/staging/iio/meter/ade7854-spi.c
index 1eba3044b86f..964d6c6e76d1 100644
--- a/drivers/staging/iio/meter/ade7854-spi.c
+++ b/drivers/staging/iio/meter/ade7854-spi.c
@@ -67,9 +67,10 @@ static int ade7854_spi_write_reg(struct device *dev,
return ret;
}

-static int ade7854_spi_read_reg_8(struct device *dev,
- u16 reg_address,
- u8 *val)
+static int ade7854_spi_read_reg(struct device *dev,
+ u16 reg_address,
+ u32 *val,
+ int bytes)
{
struct iio_dev *indio_dev = dev_to_iio_dev(dev);
struct ade7854_state *st = iio_priv(indio_dev);
@@ -82,7 +83,7 @@ static int ade7854_spi_read_reg_8(struct device *dev,
}, {
.rx_buf = st->rx,
.bits_per_word = 8,
- .len = 1,
+ .len = bytes,
}
};

@@ -94,128 +95,61 @@ static int ade7854_spi_read_reg_8(struct device *dev,

ret = spi_sync_transfer(st->spi, xfers, ARRAY_SIZE(xfers));
if (ret) {
- dev_err(&st->spi->dev, "problem when reading 8 bit register 0x%02X",
+ dev_err(&st->spi->dev, "problem when reading register 0x%02X",
reg_address);
- goto error_ret;
+ goto unlock;
+ }
+
+ switch (bytes) {
+ case DATA_SIZE_8_BITS:
+ *val = st->rx[0];
+ break;
+ case DATA_SIZE_16_BITS:
+ *val = be16_to_cpup((const __be16 *)st->rx);
+ break;
+ case DATA_SIZE_24_BITS:
+ *val = (st->rx[0] << 16) | (st->rx[1] << 8) | st->rx[2];
+ break;
+ case DATA_SIZE_32_BITS:
+ *val = be32_to_cpup((const __be32 *)st->rx);
+ break;
}
- *val = st->rx[0];

-error_ret:
+unlock:
mutex_unlock(&st->buf_lock);
return ret;
}

+static int ade7854_spi_read_reg_8(struct device *dev,
+ u16 reg_address,
+ u8 *val)
+{
+ return ade7854_spi_read_reg(dev, reg_address, (u32 *)val,
+ DATA_SIZE_8_BITS);
+}
+
static int ade7854_spi_read_reg_16(struct device *dev,
u16 reg_address,
u16 *val)
{
- struct iio_dev *indio_dev = dev_to_iio_dev(dev);
- struct ade7854_state *st = iio_priv(indio_dev);
- int ret;
- struct spi_transfer xfers[] = {
- {
- .tx_buf = st->tx,
- .bits_per_word = 8,
- .len = 3,
- }, {
- .rx_buf = st->rx,
- .bits_per_word = 8,
- .len = 2,
- }
- };
-
- mutex_lock(&st->buf_lock);
- st->tx[0] = ADE7854_READ_REG;
- st->tx[1] = (reg_address >> 8) & 0xFF;
- st->tx[2] = reg_address & 0xFF;
-
- ret = spi_sync_transfer(st->spi, xfers, ARRAY_SIZE(xfers));
- if (ret) {
- dev_err(&st->spi->dev, "problem when reading 16 bit register 0x%02X",
- reg_address);
- goto error_ret;
- }
- *val = be16_to_cpup((const __be16 *)st->rx);
-
-error_ret:
- mutex_unlock(&st->buf_lock);
- return ret;
+ return ade7854_spi_read_reg(dev, reg_address, (u32 *)val,
+ DATA_SIZE_16_BITS);
}

static int ade7854_spi_read_reg_24(struct device *dev,
u16 reg_address,
u32 *val)
{
- struct iio_dev *indio_dev = dev_to_iio_dev(dev);
- struct ade7854_state *st = iio_priv(indio_dev);
- int ret;
- struct spi_transfer xfers[] = {
- {
- .tx_buf = st->tx,
- .bits_per_word = 8,
- .len = 3,
- }, {
- .rx_buf = st->rx,
- .bits_per_word = 8,
- .len = 3,
- }
- };
-
- mutex_lock(&st->buf_lock);
-
- st->tx[0] = ADE7854_READ_REG;
- st->tx[1] = (reg_address >> 8) & 0xFF;
- st->tx[2] = reg_address & 0xFF;
-
- ret = spi_sync_transfer(st->spi, xfers, ARRAY_SIZE(xfers));
- if (ret) {
- dev_err(&st->spi->dev, "problem when reading 24 bit register 0x%02X",
- reg_address);
- goto error_ret;
- }
- *val = (st->rx[0] << 16) | (st->rx[1] << 8) | st->rx[2];
-
-error_ret:
- mutex_unlock(&st->buf_lock);
- return ret;
+ return ade7854_spi_read_reg(dev, reg_address, (u32 *)val,
+ DATA_SIZE_24_BITS);
}

static int ade7854_spi_read_reg_32(struct device *dev,
u16 reg_address,
u32 *val)
{
- struct iio_dev *indio_dev = dev_to_iio_dev(dev);
- struct ade7854_state *st = iio_priv(indio_dev);
- int ret;
- struct spi_transfer xfers[] = {
- {
- .tx_buf = st->tx,
- .bits_per_word = 8,
- .len = 3,
- }, {
- .rx_buf = st->rx,
- .bits_per_word = 8,
- .len = 4,
- }
- };
-
- mutex_lock(&st->buf_lock);
-
- st->tx[0] = ADE7854_READ_REG;
- st->tx[1] = (reg_address >> 8) & 0xFF;
- st->tx[2] = reg_address & 0xFF;
-
- ret = spi_sync_transfer(st->spi, xfers, ARRAY_SIZE(xfers));
- if (ret) {
- dev_err(&st->spi->dev, "problem when reading 32 bit register 0x%02X",
- reg_address);
- goto error_ret;
- }
- *val = be32_to_cpup((const __be32 *)st->rx);
-
-error_ret:
- mutex_unlock(&st->buf_lock);
- return ret;
+ return ade7854_spi_read_reg(dev, reg_address, (u32 *)val,
+ DATA_SIZE_32_BITS);
}

static int ade7854_spi_probe(struct spi_device *spi)
--
2.16.2
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