Hi Peter,
On 23/07/14 20:05, Peter Meerwald wrote:
Hello Martin,
Many of the hardware configuration registers may only be modified while the
device is inactive.
so this means that writing INFO_SAMP_FREQ or INFO_SCALE won't work without
deactivating / reactivating the device?
I'm pretty sure I tried this...
I've tried it and it doesn't work.
Applying this (demo only, not for merging) patch on top of my series to
make the debugfs code not deactivate / reactivate on writes:
@@ -608,7 +608,7 @@ static int mma8452_reg_access_dbg(struct iio_dev
*indio_dev,
return -EINVAL;
if (readval == NULL) {
- ret = mma8452_change_config(data, reg, writeval);
+ ret = i2c_smbus_write_byte_data(data->client, reg,
writeval);
} else {
ret = i2c_smbus_read_byte_data(data->client, reg);
if (ret < 0)
Then:
# cd /sys/kernel/debug/iio/iio:device0
# echo 0x0e > direct_reg_access
# cat direct_reg_access
0x0
# echo 0x0e 0x01 >direct_reg_access
# cat direct_reg_access
0x0
So the write is not changing anything.
Removing the demo patch so that mma8452_change_config() is used causes
it to work as expected:
# echo 0x0e 0x01 > direct_reg_access
# cat direct_reg_access
0x1
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