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Date: Sun, 9 Jul 2017 18:28:12 +0100
From: Jonathan Cameron <jic23@...nel.org>
To: Brian Masney <masneyb@...tation.org>
Cc: linux-iio@...r.kernel.org, gregkh@...uxfoundation.org,
devel@...verdev.osuosl.org, knaack.h@....de, lars@...afoo.de,
pmeerw@...erw.net, linux-kernel@...r.kernel.org,
Jon.Brenner@....com
Subject: Re: [PATCH v2 4/9] staging: iio: tsl2x7x: remove tsl2x7x_i2c_read()
On Thu, 6 Jul 2017 18:56:21 -0400
Brian Masney <masneyb@...tation.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 <masneyb@...tation.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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