A-Team_Digital_Solutions/android_kernel_motorola_sm6375
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Input: ti_am335x_tsc - interchange touchscreen and ADC steps

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This patch makes the initial changes required to workaround TSC-false
pen-up interrupts. It is required to implement these changes in order to
remove udelay in the TSC interrupt handler and false pen-up events.  The
charge step is to be executed immediately after sampling X+. Hence TSC is
made to use higher numbered steps (steps 5 to 16 for 5 co-ordinate
readouts, 4 wire TSC configuration) and ADC to use lower ones. Further X
co-ordinate readouts must be the last to be sampled, thus co-ordinates are
sampled in the order Y-Z-X.

Signed-off-by: Brad Griffis <[email protected]>
[[email protected]: Ported the patch from v3.12 to v3.19rc1]
Signed-off-by: Vignesh R <[email protected]>
Acked-by: Jonathan Cameron <[email protected]>
Signed-off-by: Dmitry Torokhov <[email protected]>
This commit is contained in:
Brad Griffis 2015-02-03 11:41:58 -08:00 • committed by Dmitry Torokhov
commit 3a59684ccc
2 changed files with 26 additions and 21 deletions
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5
drivers/iio/adc/ti_am335x_adc.c
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@ -86,19 +86,18 @@ static void tiadc_step_config(struct iio_dev *indio_dev)
{
struct tiadc_device *adc_dev = iio_priv(indio_dev);
unsigned int stepconfig;
int i, steps;
int i, steps = 0;
/*
* There are 16 configurable steps and 8 analog input
* lines available which are shared between Touchscreen and ADC.
*
* Steps backwards i.e. from 16 towards 0 are used by ADC
* Steps forwards i.e. from 0 towards 16 are used by ADC
* depending on number of input lines needed.
* Channel would represent which analog input
* needs to be given to ADC to digitalize data.
*/
steps = TOTAL_STEPS - adc_dev->channels;
if (iio_buffer_enabled(indio_dev))
stepconfig = STEPCONFIG_AVG_16 | STEPCONFIG_FIFO1
| STEPCONFIG_MODE_SWCNT;