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SubjectRe: [PATCH v3 6/8] staging:iio:ade7854: Rework I2C read function
On Fri, 23 Mar 2018 11:26:57 -0300
Rodrigo Siqueira <rodrigosiqueiramelo@gmail.com> wrote:

> The read operation for the I2C function has many duplications that can
> be generalized into a single function. This patch reworks the read
> operation for I2C to centralizes all similar code in a single function.
>
> It is possible to remove all the old interface to use the new one,
> however, for keeping the things simple and working this patch maintain
> legacy interface.
>
> Signed-off-by: Rodrigo Siqueira <rodrigosiqueiramelo@gmail.com>
Applied, 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-i2c.c | 106 +++++++++++---------------------
> 1 file changed, 37 insertions(+), 69 deletions(-)
>
> diff --git a/drivers/staging/iio/meter/ade7854-i2c.c b/drivers/staging/iio/meter/ade7854-i2c.c
> index 29e959fdb932..63793f9664c7 100644
> --- a/drivers/staging/iio/meter/ade7854-i2c.c
> +++ b/drivers/staging/iio/meter/ade7854-i2c.c
> @@ -65,9 +65,10 @@ static int ade7854_i2c_write_reg(struct device *dev,
> return ret < 0 ? ret : 0;
> }
>
> -static int ade7854_i2c_read_reg_8(struct device *dev,
> - u16 reg_address,
> - u8 *val)
> +static int ade7854_i2c_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);
> @@ -79,95 +80,62 @@ static int ade7854_i2c_read_reg_8(struct device *dev,
>
> ret = i2c_master_send(st->i2c, st->tx, 2);
> if (ret < 0)
> - goto out;
> + goto unlock;
>
> - ret = i2c_master_recv(st->i2c, st->rx, 1);
> + ret = i2c_master_recv(st->i2c, st->rx, bits);
> if (ret < 0)
> - goto out;
> + goto unlock;
> +
> + switch (bits) {
> + case 8:
> + *val = st->rx[0];
> + break;
> + case 16:
> + *val = (st->rx[0] << 8) | st->rx[1];
> + break;
> + case 24:
> + *val = (st->rx[0] << 16) | (st->rx[1] << 8) | st->rx[2];
> + break;
> + case 32:
> + *val = (st->rx[0] << 24) | (st->rx[1] << 16) |
> + (st->rx[2] << 8) | st->rx[3];
> + break;
> + default:
> + ret = -EINVAL;
> + goto unlock;
> + }
>
> - *val = st->rx[0];
> -out:
> +unlock:
> mutex_unlock(&st->buf_lock);
> 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, 8);
> +}
> +
> static int ade7854_i2c_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;
> -
> - mutex_lock(&st->buf_lock);
> - st->tx[0] = (reg_address >> 8) & 0xFF;
> - st->tx[1] = reg_address & 0xFF;
> -
> - ret = i2c_master_send(st->i2c, st->tx, 2);
> - if (ret < 0)
> - goto out;
> -
> - ret = i2c_master_recv(st->i2c, st->rx, 2);
> - if (ret < 0)
> - goto out;
> -
> - *val = (st->rx[0] << 8) | st->rx[1];
> -out:
> - mutex_unlock(&st->buf_lock);
> - return ret;
> + return ade7854_i2c_read_reg(dev, reg_address, (u32 *)val, 16);
> }
>
> static int ade7854_i2c_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;
> -
> - mutex_lock(&st->buf_lock);
> - st->tx[0] = (reg_address >> 8) & 0xFF;
> - st->tx[1] = reg_address & 0xFF;
> -
> - ret = i2c_master_send(st->i2c, st->tx, 2);
> - if (ret < 0)
> - goto out;
> -
> - ret = i2c_master_recv(st->i2c, st->rx, 3);
> - if (ret < 0)
> - goto out;
> -
> - *val = (st->rx[0] << 16) | (st->rx[1] << 8) | st->rx[2];
> -out:
> - mutex_unlock(&st->buf_lock);
> - return ret;
> + return ade7854_i2c_read_reg(dev, reg_address, (u32 *)val, 24);
> }
>
> static int ade7854_i2c_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;
> -
> - mutex_lock(&st->buf_lock);
> - st->tx[0] = (reg_address >> 8) & 0xFF;
> - st->tx[1] = reg_address & 0xFF;
> -
> - ret = i2c_master_send(st->i2c, st->tx, 2);
> - if (ret < 0)
> - goto out;
> -
> - ret = i2c_master_recv(st->i2c, st->rx, 4);
> - if (ret < 0)
> - goto out;
> -
> - *val = (st->rx[0] << 24) | (st->rx[1] << 16) |
> - (st->rx[2] << 8) | st->rx[3];
> -out:
> - mutex_unlock(&st->buf_lock);
> - return ret;
> + return ade7854_i2c_read_reg(dev, reg_address, (u32 *)val, 32);
> }
>
> static int ade7854_i2c_probe(struct i2c_client *client,

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