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@xxxxxxxxxxxxx>
---
drivers/staging/iio/light/tsl2583.c | 13 ++-----------
1 file changed, 2 insertions(+), 11 deletions(-)
diff --git a/drivers/staging/iio/light/tsl2583.c b/drivers/staging/iio/light/tsl2583.c
index 709f446..7fb09c6 100644
--- a/drivers/staging/iio/light/tsl2583.c
+++ b/drivers/staging/iio/light/tsl2583.c
@@ -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.
--
2.5.5
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