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staging: iio: tsl2583: remove redundant power off sequence in taos_chip_on()

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taos_chip_on() explicitly turns the sensor power on and then writes the
8 registers that are stored in taos_config. The first register in
taos_config is the CONTROL register and the configuration is set to
turn the power off. The existing state sequence in taos_chip_on() is:

- Turn device power on
- Turn device power off (via taos_config)
- Configure other 7 registers (via taos_config)
- Turn device power on, enable ADC

This patch changes the code so that the device is not powered off via
taos_config.

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 08:56:15 -04:00 committed by Jonathan Cameron
parent 4a0f36144c
commit babe444798
1 changed files with 2 additions and 11 deletions
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13
drivers/staging/iio/light/tsl2583.c
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@ -410,17 +410,8 @@ static int taos_chip_on(struct iio_dev *indio_dev)
chip->als_saturation = als_count * 922; /* 90% of full scale */
chip->als_time_scale = (als_time + 25) / 50;
/*
* TSL258x Specific power-on / adc enable sequence
* Power on the device 1st.
*/
utmp = TSL258X_CNTL_PWR_ON;
ret = i2c_smbus_write_byte_data(chip->client,
TSL258X_CMD_REG | TSL258X_CNTRL, utmp);
if (ret < 0) {
dev_err(&chip->client->dev, "taos_chip_on failed on CNTRL reg.\n");
return ret;
}
/* Power on the device; ADC off. */
chip->taos_config[TSL258X_CNTRL] = TSL258X_CNTL_PWR_ON;
/*
* Use the following shadow copy for our delay before enabling ADC.