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SubjectRe: [PATCH v3 7/8] staging:iio:ade7854: Rework SPI read function
On Fri, 23 Mar 2018 11:27:12 -0300
Rodrigo Siqueira <rodrigosiqueiramelo@gmail.com> wrote:

> 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>
Applied to the togreg branch of iio.git and pushed out as testing
for the autobuilders to play with it.

Thanks,

Jonathan

> ---
> Changes in v3:
> - Remove the use of defines that not improve the readability
> - Replace variable name "bytes" for "bits"
> - Update commit message
>
> drivers/staging/iio/meter/ade7854-spi.c | 136 ++++++++------------------------
> 1 file changed, 33 insertions(+), 103 deletions(-)
>
> diff --git a/drivers/staging/iio/meter/ade7854-spi.c b/drivers/staging/iio/meter/ade7854-spi.c
> index be7397042850..ee6e4d166ece 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 bits)
> {
> 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 = bits,
> }
> };
>
> @@ -94,128 +95,57 @@ 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 (bits) {
> + case 8:
> + *val = st->rx[0];
> + break;
> + case 16:
> + *val = be16_to_cpup((const __be16 *)st->rx);
> + break;
> + case 24:
> + *val = (st->rx[0] << 16) | (st->rx[1] << 8) | st->rx[2];
> + break;
> + case 32:
> + *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, 8);
> +}
> +
> 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, 16);
> }
>
> 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, 24);
> }
>
> 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, 32);
> }
>
> static int ade7854_spi_probe(struct spi_device *spi)

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