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staging: iio: tsl2583: remove redudant i2c call in taos_als_calibrate() 

taos_als_calibrate() queries the control register to determine if the
unit is powered on and has the ADC enabled. It then queries the same
register a second time to determine if the ADC reading is valid. This
patch removes the redundant i2c_smbus_read_byte_data() call.

Verified that the driver still functions correctly using a TSL2581
hooked up to a Raspberry Pi 2.

Signed-off-by: Brian Masney <masneyb@onstation.org>
Signed-off-by: Jonathan Cameron <jic23@kernel.org>
This commit is contained in:
Brian Masney 2016-11-03 08:56:17 -04:00 committed by Jonathan Cameron
parent 0561155f6f
commit c2b0d2cfb0
1 changed files with 1 additions and 12 deletions
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13
drivers/staging/iio/light/tsl2583.c
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@ -338,18 +338,7 @@ static int taos_als_calibrate(struct iio_dev *indio_dev)
dev_err(&chip->client->dev, dev_err(&chip->client->dev,
"taos_als_calibrate failed: device not powered on with ADC enabled\n"); "taos_als_calibrate failed: device not powered on with ADC enabled\n");
return -EINVAL; return -EINVAL;
} } else if ((ret & TSL258X_STA_ADC_VALID) != TSL258X_STA_ADC_VALID) {
ret = i2c_smbus_read_byte_data(chip->client,
TSL258X_CMD_REG | TSL258X_CNTRL);
if (ret < 0) {
dev_err(&chip->client->dev,
"%s failed to read from the CNTRL register\n",
__func__);
return ret;
}
if ((ret & TSL258X_STA_ADC_VALID) != TSL258X_STA_ADC_VALID) {
dev_err(&chip->client->dev, dev_err(&chip->client->dev,
"taos_als_calibrate failed: STATUS - ADC not valid.\n"); "taos_als_calibrate failed: STATUS - ADC not valid.\n");
return -ENODATA; return -ENODATA;