On Thu,  6 Jul 2017 18:56:21 -0400
Brian Masney <masn...@onstation.org> wrote:

> tsl2x7x_i2c_read() would call i2c_smbus_write_byte() and
> i2c_smbus_read_byte(). These two i2c functions can be replaced with a
> single call to i2c_smbus_read_byte_data(). This patch removes the
> tsl2x7x_i2c_read() function and replaces all occurrences with a call to
> i2c_smbus_read_byte_data().
> 
> Signed-off-by: Brian Masney <masn...@onstation.org>
Applied.
> ---
>  drivers/staging/iio/light/tsl2x7x.c | 71 
> ++++++++++++-------------------------
>  1 file changed, 22 insertions(+), 49 deletions(-)
> 
> diff --git a/drivers/staging/iio/light/tsl2x7x.c 
> b/drivers/staging/iio/light/tsl2x7x.c
> index 95ed7cc6..6c9f06b 100644
> --- a/drivers/staging/iio/light/tsl2x7x.c
> +++ b/drivers/staging/iio/light/tsl2x7x.c
> @@ -285,35 +285,6 @@ static const u8 device_channel_config[] = {
>  };
>  
>  /**
> - * tsl2x7x_i2c_read() - Read a byte from a register.
> - * @client:  i2c client
> - * @reg:     device register to read from
> - * @*val:    pointer to location to store register contents.
> - *
> - */
> -static int
> -tsl2x7x_i2c_read(struct i2c_client *client, u8 reg, u8 *val)
> -{
> -     int ret;
> -
> -     /* select register to write */
> -     ret = i2c_smbus_write_byte(client, (TSL2X7X_CMD_REG | reg));
> -     if (ret < 0) {
> -             dev_err(&client->dev, "failed to write register %x\n", reg);
> -             return ret;
> -     }
> -
> -     /* read the data */
> -     ret = i2c_smbus_read_byte(client);
> -     if (ret >= 0)
> -             *val = (u8)ret;
> -     else
> -             dev_err(&client->dev, "failed to read register %x\n", reg);
> -
> -     return ret;
> -}
> -
> -/**
>   * tsl2x7x_get_lux() - Reads and calculates current lux value.
>   * @indio_dev:       pointer to IIO device
>   *
> @@ -352,15 +323,15 @@ static int tsl2x7x_get_lux(struct iio_dev *indio_dev)
>               goto out_unlock;
>       }
>  
> -     ret = tsl2x7x_i2c_read(chip->client,
> -                            (TSL2X7X_CMD_REG | TSL2X7X_STATUS), &buf[0]);
> +     ret = i2c_smbus_read_byte_data(chip->client,
> +                                    TSL2X7X_CMD_REG | TSL2X7X_STATUS);
>       if (ret < 0) {
>               dev_err(&chip->client->dev,
>                       "%s: Failed to read STATUS Reg\n", __func__);
>               goto out_unlock;
>       }
>       /* is data new & valid */
> -     if (!(buf[0] & TSL2X7X_STA_ADC_VALID)) {
> +     if (!(ret & TSL2X7X_STA_ADC_VALID)) {
>               dev_err(&chip->client->dev,
>                       "%s: data not valid yet\n", __func__);
>               ret = chip->als_cur_info.lux; /* return LAST VALUE */
> @@ -368,14 +339,16 @@ static int tsl2x7x_get_lux(struct iio_dev *indio_dev)
>       }
>  
>       for (i = 0; i < 4; i++) {
> -             ret = tsl2x7x_i2c_read(chip->client,
> -                                    (TSL2X7X_CMD_REG |
> -                                    (TSL2X7X_ALS_CHAN0LO + i)), &buf[i]);
> +             int reg = TSL2X7X_CMD_REG | (TSL2X7X_ALS_CHAN0LO + i);
> +
> +             ret = i2c_smbus_read_byte_data(chip->client, reg);
>               if (ret < 0) {
>                       dev_err(&chip->client->dev,
>                               "failed to read. err=%x\n", ret);
>                       goto out_unlock;
>               }
> +
> +             buf[i] = ret;
>       }
>  
>       /* clear any existing interrupt status */
> @@ -475,7 +448,6 @@ static int tsl2x7x_get_prox(struct iio_dev *indio_dev)
>  {
>       int i;
>       int ret;
> -     u8 status;
>       u8 chdata[2];
>       struct tsl2X7X_chip *chip = iio_priv(indio_dev);
>  
> @@ -485,8 +457,8 @@ static int tsl2x7x_get_prox(struct iio_dev *indio_dev)
>               return -EBUSY;
>       }
>  
> -     ret = tsl2x7x_i2c_read(chip->client,
> -                            (TSL2X7X_CMD_REG | TSL2X7X_STATUS), &status);
> +     ret = i2c_smbus_read_byte_data(chip->client,
> +                                    TSL2X7X_CMD_REG | TSL2X7X_STATUS);
>       if (ret < 0) {
>               dev_err(&chip->client->dev, "i2c err=%d\n", ret);
>               goto prox_poll_err;
> @@ -498,7 +470,7 @@ static int tsl2x7x_get_prox(struct iio_dev *indio_dev)
>       case tmd2671:
>       case tsl2771:
>       case tmd2771:
> -             if (!(status & TSL2X7X_STA_ADC_VALID))
> +             if (!(ret & TSL2X7X_STA_ADC_VALID))
>                       goto prox_poll_err;
>       break;
>       case tsl2572:
> @@ -506,17 +478,19 @@ static int tsl2x7x_get_prox(struct iio_dev *indio_dev)
>       case tmd2672:
>       case tsl2772:
>       case tmd2772:
> -             if (!(status & TSL2X7X_STA_PRX_VALID))
> +             if (!(ret & TSL2X7X_STA_PRX_VALID))
>                       goto prox_poll_err;
>       break;
>       }
>  
>       for (i = 0; i < 2; i++) {
> -             ret = tsl2x7x_i2c_read(chip->client,
> -                                    (TSL2X7X_CMD_REG |
> -                                    (TSL2X7X_PRX_LO + i)), &chdata[i]);
> +             int reg = TSL2X7X_CMD_REG | (TSL2X7X_PRX_LO + i);
> +
> +             ret = i2c_smbus_read_byte_data(chip->client, reg);
>               if (ret < 0)
>                       goto prox_poll_err;
> +
> +             chdata[i] = ret;
>       }
>  
>       chip->prox_data =
> @@ -1486,7 +1460,7 @@ static DEVICE_ATTR_RW(in_intensity0_thresh_period);
>  static DEVICE_ATTR_RW(in_proximity0_thresh_period);
>  
>  /* Use the default register values to identify the Taos device */
> -static int tsl2x7x_device_id(unsigned char *id, int target)
> +static int tsl2x7x_device_id(int *id, int target)
>  {
>       switch (target) {
>       case tsl2571:
> @@ -1843,7 +1817,6 @@ static int tsl2x7x_probe(struct i2c_client *clientp,
>                        const struct i2c_device_id *id)
>  {
>       int ret;
> -     unsigned char device_id;
>       struct iio_dev *indio_dev;
>       struct tsl2X7X_chip *chip;
>  
> @@ -1855,13 +1828,13 @@ static int tsl2x7x_probe(struct i2c_client *clientp,
>       chip->client = clientp;
>       i2c_set_clientdata(clientp, indio_dev);
>  
> -     ret = tsl2x7x_i2c_read(chip->client,
> -                            TSL2X7X_CHIPID, &device_id);
> +     ret = i2c_smbus_read_byte_data(chip->client,
> +                                    TSL2X7X_CMD_REG | TSL2X7X_CHIPID);
>       if (ret < 0)
>               return ret;
>  
> -     if ((!tsl2x7x_device_id(&device_id, id->driver_data)) ||
> -         (tsl2x7x_device_id(&device_id, id->driver_data) == -EINVAL)) {
> +     if ((!tsl2x7x_device_id(&ret, id->driver_data)) ||
> +         (tsl2x7x_device_id(&ret, id->driver_data) == -EINVAL)) {
>               dev_info(&chip->client->dev,
>                        "%s: i2c device found does not match expected id\n",
>                               __func__);

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