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Subject[PATCH v3 6/8] staging:iio:ade7854: Rework I2C read function
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>
---
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,
--
2.16.2
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