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SubjectRe: [PATCH v2 8/8] staging:iio:ade7854: Remove read_reg_* duplications
On Fri, 16 Mar 2018 19:50:29 -0300
Rodrigo Siqueira <rodrigosiqueiramelo@gmail.com> wrote:

> The original code had a read function per data size; after updates, all
> read functions tasks were centralized in a single function, but the old
> signature was kept to maintain the module working without problems. This
> patch removes a set of duplications associated with read_reg_*, and
> update the areas that calling the old interface by the new one. During
> the update for use a single function, some errors handlings were updated
> based on the John Syne patches.
>
> Signed-off-by: Rodrigo Siqueira <rodrigosiqueiramelo@gmail.com>
> Signed-off-by: John Syne <john3909@gmail.com>
The meaning of John's signed-off-by here needs clarifying..

Also fix up the common on error handling as I believe you now do that in
an earlier patch.

Thanks and looking forward to v3. This is a nice little bit of cleanup.
These weird devices with variable register sizes are always somewhat of
a pain to deal with.

Jonathan

> ---
> drivers/staging/iio/meter/ade7854-i2c.c | 37 +------------------------------
> drivers/staging/iio/meter/ade7854-spi.c | 39 ++-------------------------------
> drivers/staging/iio/meter/ade7854.c | 18 +++++++--------
> drivers/staging/iio/meter/ade7854.h | 7 +++---
> 4 files changed, 15 insertions(+), 86 deletions(-)
>
> diff --git a/drivers/staging/iio/meter/ade7854-i2c.c b/drivers/staging/iio/meter/ade7854-i2c.c
> index 20db8eedb84a..162c171a8851 100644
> --- a/drivers/staging/iio/meter/ade7854-i2c.c
> +++ b/drivers/staging/iio/meter/ade7854-i2c.c
> @@ -110,38 +110,6 @@ static int ade7854_i2c_read_reg(struct device *dev,
> return ret;
> }
>
> -static int ade7854_i2c_read_reg_8(struct device *dev,
> - u16 reg_address,
> - u8 *val)
> -{
> - return ade7854_i2c_read_reg(dev, reg_address, (u32 *)val,
> - DATA_SIZE_8_BITS);
> -}
> -
> -static int ade7854_i2c_read_reg_16(struct device *dev,
> - u16 reg_address,
> - u16 *val)
> -{
> - return ade7854_i2c_read_reg(dev, reg_address, (u32 *)val,
> - DATA_SIZE_16_BITS);
> -}
> -
> -static int ade7854_i2c_read_reg_24(struct device *dev,
> - u16 reg_address,
> - u32 *val)
> -{
> - return ade7854_i2c_read_reg(dev, reg_address, (u32 *)val,
> - DATA_SIZE_24_BITS);
> -}
> -
> -static int ade7854_i2c_read_reg_32(struct device *dev,
> - u16 reg_address,
> - u32 *val)
> -{
> - return ade7854_i2c_read_reg(dev, reg_address, (u32 *)val,
> - DATA_SIZE_32_BITS);
> -}
> -
> static int ade7854_i2c_probe(struct i2c_client *client,
> const struct i2c_device_id *id)
> {
> @@ -153,10 +121,7 @@ static int ade7854_i2c_probe(struct i2c_client *client,
> return -ENOMEM;
> st = iio_priv(indio_dev);
> i2c_set_clientdata(client, indio_dev);
> - st->read_reg_8 = ade7854_i2c_read_reg_8;
> - st->read_reg_16 = ade7854_i2c_read_reg_16;
> - st->read_reg_24 = ade7854_i2c_read_reg_24;
> - st->read_reg_32 = ade7854_i2c_read_reg_32;
> + st->read_reg = ade7854_i2c_read_reg;
> st->write_reg = ade7854_i2c_write_reg;
> st->i2c = client;
> st->irq = client->irq;
> diff --git a/drivers/staging/iio/meter/ade7854-spi.c b/drivers/staging/iio/meter/ade7854-spi.c
> index 964d6c6e76d1..66b8a8767a26 100644
> --- a/drivers/staging/iio/meter/ade7854-spi.c
> +++ b/drivers/staging/iio/meter/ade7854-spi.c
> @@ -94,7 +94,7 @@ static int ade7854_spi_read_reg(struct device *dev,
> st->tx[2] = reg_address & 0xFF;
>
> ret = spi_sync_transfer(st->spi, xfers, ARRAY_SIZE(xfers));
> - if (ret) {
> + if (ret < 0) {
> dev_err(&st->spi->dev, "problem when reading register 0x%02X",
> reg_address);
> goto unlock;
> @@ -120,38 +120,6 @@ static int ade7854_spi_read_reg(struct device *dev,
> 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)
> -{
> - 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)
> -{
> - 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)
> -{
> - return ade7854_spi_read_reg(dev, reg_address, (u32 *)val,
> - DATA_SIZE_32_BITS);
> -}
> -
> static int ade7854_spi_probe(struct spi_device *spi)
> {
> struct ade7854_state *st;
> @@ -162,10 +130,7 @@ static int ade7854_spi_probe(struct spi_device *spi)
> return -ENOMEM;
> st = iio_priv(indio_dev);
> spi_set_drvdata(spi, indio_dev);
> - st->read_reg_8 = ade7854_spi_read_reg_8;
> - st->read_reg_16 = ade7854_spi_read_reg_16;
> - st->read_reg_24 = ade7854_spi_read_reg_24;
> - st->read_reg_32 = ade7854_spi_read_reg_32;
> + st->read_reg = ade7854_spi_read_reg;
> st->write_reg = ade7854_spi_write_reg;
> st->irq = spi->irq;
> st->spi = spi;
> diff --git a/drivers/staging/iio/meter/ade7854.c b/drivers/staging/iio/meter/ade7854.c
> index 4aa7c6ce0016..09fd8c067738 100644
> --- a/drivers/staging/iio/meter/ade7854.c
> +++ b/drivers/staging/iio/meter/ade7854.c
> @@ -27,12 +27,12 @@ static ssize_t ade7854_read_8bit(struct device *dev,
> char *buf)
> {
> int ret;
> - u8 val = 0;
> + u32 val = 0;
> struct iio_dev *indio_dev = dev_to_iio_dev(dev);
> struct ade7854_state *st = iio_priv(indio_dev);
> struct iio_dev_attr *this_attr = to_iio_dev_attr(attr);
>
> - ret = st->read_reg_8(dev, this_attr->address, &val);
> + ret = st->read_reg(dev, this_attr->address, &val, DATA_SIZE_8_BITS);
> if (ret < 0)
> return ret;
>
> @@ -44,12 +44,12 @@ static ssize_t ade7854_read_16bit(struct device *dev,
> char *buf)
> {
> int ret;
> - u16 val = 0;
> + u32 val = 0;
> struct iio_dev *indio_dev = dev_to_iio_dev(dev);
> struct ade7854_state *st = iio_priv(indio_dev);
> struct iio_dev_attr *this_attr = to_iio_dev_attr(attr);
>
> - ret = st->read_reg_16(dev, this_attr->address, &val);
> + ret = st->read_reg(dev, this_attr->address, &val, DATA_SIZE_16_BITS);
> if (ret < 0)
> return ret;
>
> @@ -66,7 +66,7 @@ static ssize_t ade7854_read_24bit(struct device *dev,
> struct ade7854_state *st = iio_priv(indio_dev);
> struct iio_dev_attr *this_attr = to_iio_dev_attr(attr);
>
> - ret = st->read_reg_24(dev, this_attr->address, &val);
> + ret = st->read_reg(dev, this_attr->address, &val, DATA_SIZE_24_BITS);
> if (ret < 0)
> return ret;
>
> @@ -83,7 +83,7 @@ static ssize_t ade7854_read_32bit(struct device *dev,
> struct iio_dev *indio_dev = dev_to_iio_dev(dev);
> struct ade7854_state *st = iio_priv(indio_dev);
>
> - ret = st->read_reg_32(dev, this_attr->address, &val);
> + ret = st->read_reg(dev, this_attr->address, &val, DATA_SIZE_32_BITS);
> if (ret < 0)
> return ret;
>
> @@ -178,9 +178,9 @@ static int ade7854_reset(struct device *dev)
> {
> struct iio_dev *indio_dev = dev_to_iio_dev(dev);
> struct ade7854_state *st = iio_priv(indio_dev);
> - u16 val;
> + u32 val;
>
> - st->read_reg_16(dev, ADE7854_CONFIG, &val);
> + st->read_reg(dev, ADE7854_CONFIG, &val, DATA_SIZE_16_BITS);
> val |= BIT(7); /* Software Chip Reset */
>
> return st->write_reg(dev, ADE7854_CONFIG, val, DATA_SIZE_16_BITS);
> @@ -415,7 +415,7 @@ static int ade7854_set_irq(struct device *dev, bool enable)
> int ret;
> u32 irqen;
>
> - ret = st->read_reg_32(dev, ADE7854_MASK0, &irqen);
> + ret = st->read_reg(dev, ADE7854_MASK0, &irqen, DATA_SIZE_32_BITS);
> if (ret < 0)
> return ret;
>
> diff --git a/drivers/staging/iio/meter/ade7854.h b/drivers/staging/iio/meter/ade7854.h
> index aa29faf7c91f..78584f01d052 100644
> --- a/drivers/staging/iio/meter/ade7854.h
> +++ b/drivers/staging/iio/meter/ade7854.h
> @@ -153,6 +153,7 @@ enum data_size {
> /**
> * struct ade7854_state - device instance specific data
> * @spi: actual spi_device
> + * @read_reg Wrapper function for I2C and SPI read
> * @write_reg Wrapper function for I2C and SPI write
> * @indio_dev: industrial I/O device structure
> * @buf_lock: mutex to protect tx and rx
> @@ -162,10 +163,8 @@ enum data_size {
> struct ade7854_state {
> struct spi_device *spi;
> struct i2c_client *i2c;
> - int (*read_reg_8)(struct device *dev, u16 reg_address, u8 *val);
> - int (*read_reg_16)(struct device *dev, u16 reg_address, u16 *val);
> - int (*read_reg_24)(struct device *dev, u16 reg_address, u32 *val);
> - int (*read_reg_32)(struct device *dev, u16 reg_address, u32 *val);
> + int (*read_reg)(struct device *dev, u16 reg_address, u32 *val,
> + int type);
> int (*write_reg)(struct device *dev, u16 reg_address, u32 val,
> int type);
> int irq;

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