From: Michael Hennerich Date: Fri, 6 Jul 2012 17:44:19 +0000 (-0700) Subject: Input: ad7879 - add option to correct xy axis X-Git-Url: https://git.karo-electronics.de/?a=commitdiff_plain;h=6680884a4420;p=linux-beck.git Input: ad7879 - add option to correct xy axis Sebastian Zenker reported that driver swaps x and y samples when the touchscreen leads are connected in accordance with the datasheet specification. Transposed axis can be typically corrected by touch screen calibration however this bug also negatively influences touch pressure measurements. Add an option to correct x and y axis. Signed-off-by: Michael Hennerich Reported-and-tested-by: Sebastian Zenker Signed-off-by: Dmitry Torokhov --- diff --git a/drivers/input/touchscreen/ad7879.c b/drivers/input/touchscreen/ad7879.c index e2482b40da51..e60709261951 100644 --- a/drivers/input/touchscreen/ad7879.c +++ b/drivers/input/touchscreen/ad7879.c @@ -118,6 +118,7 @@ struct ad7879 { unsigned int irq; bool disabled; /* P: input->mutex */ bool suspended; /* P: input->mutex */ + bool swap_xy; u16 conversion_data[AD7879_NR_SENSE]; char phys[32]; u8 first_conversion_delay; @@ -161,6 +162,9 @@ static int ad7879_report(struct ad7879 *ts) z1 = ts->conversion_data[AD7879_SEQ_Z1] & MAX_12BIT; z2 = ts->conversion_data[AD7879_SEQ_Z2] & MAX_12BIT; + if (ts->swap_xy) + swap(x, y); + /* * The samples processed here are already preprocessed by the AD7879. * The preprocessing function consists of a median and an averaging @@ -520,6 +524,7 @@ struct ad7879 *ad7879_probe(struct device *dev, u8 devid, unsigned int irq, ts->dev = dev; ts->input = input_dev; ts->irq = irq; + ts->swap_xy = pdata->swap_xy; setup_timer(&ts->timer, ad7879_timer, (unsigned long) ts); diff --git a/include/linux/spi/ad7879.h b/include/linux/spi/ad7879.h index 6334cee1a3be..58368be0b4c0 100644 --- a/include/linux/spi/ad7879.h +++ b/include/linux/spi/ad7879.h @@ -12,6 +12,8 @@ struct ad7879_platform_data { u16 y_min, y_max; u16 pressure_min, pressure_max; + bool swap_xy; /* swap x and y axes */ + /* [0..255] 0=OFF Starts at 1=550us and goes * all the way to 9.440ms in steps of 35us. */