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Subject[PATCH v2 4/9] staging: iio: tsl2x7x: remove tsl2x7x_i2c_read()
Date
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@onstation.org>
---
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__);
--
2.9.4
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