[at91sam9g45] touch screen not detected by Angstrom Linux
Nicolas Ferre
nicolas.ferre at atmel.com
Wed Sep 30 05:50:19 EDT 2009
Yegor Yefremov :
> Hello Nicolas,
>
> I could successfully apply your touch screen drivers to 2.6.32-rc2:
>
> 2.6.30-at91-exp-0045-input-atmel_tsadcc-touchscreen-use-platform-paramet.patch
> 2.6.30-at91-exp-0046-at91-input-platform-parameters-for-atmel_tsadcc-in.patch
> 2.6.30-at91-exp-0047-at91-input-touchscreen-support-for-at91sam9g45ekes.patch
>
> Here dmesg output for 2.6.32-rc2:
>
> atmel_tsadcc atmel_tsadcc: Master clock is set at: 133333333 Hz
> atmel_tsadcc atmel_tsadcc: Prescaler is set at: 221
> input: atmel touch screen controller as /devices/platform/atmel_tsadcc/input/input1
>
> Here dmesg output for 2.6.27 where touch screen is working under Angstrom Linux:
>
> atmel_tsadcc atmel_tsadcc: Master clock is set at: 133333333 Hz
> atmel_tsadcc atmel_tsadcc: Prescaler is set at: 221
> input: atmel touch screen controller as /class/input/input1
>
> The device is working if I read /dev/input/event1, but I'm not able to get it working under Angstrom Linux. Any ideas?
Yes: in the driver we do not report the pressure measurement (not
available on at91sam9rl). There is a bug in tslib that prevents
a pressure-less touchscreen to work correctly.
1/ solution one: apply the patch I posted on tslib ml:
https://lists.berlios.de/pipermail/tslib-general/2009-September/000225.html
2/ re-introduce the fake pressure report in your source (atmel_tsadcc driver)
8<-------------------------------------------
diff --git a/drivers/input/touchscreen/atmel_tsadcc.c b/drivers/input/touchscreen/atmel_tsadcc.c
index 3c24783..27ac912 100644
--- a/drivers/input/touchscreen/atmel_tsadcc.c
+++ b/drivers/input/touchscreen/atmel_tsadcc.c
@@ -134,6 +134,7 @@ static irqreturn_t atmel_tsadcc_interrupt(int irq, void *dev)
input_report_key(input_dev, BTN_TOUCH, 0);
ts_dev->bufferedmeasure = 0;
+ input_report_abs(input_dev, ABS_PRESSURE, 0);
input_sync(input_dev);
} else if (status & ATMEL_TSADCC_PENCNT) {
@@ -158,6 +159,7 @@ static irqreturn_t atmel_tsadcc_interrupt(int irq, void *dev)
input_report_abs(input_dev, ABS_X, ts_dev->prev_absx);
input_report_abs(input_dev, ABS_Y, ts_dev->prev_absy);
input_report_key(input_dev, BTN_TOUCH, 1);
+ input_report_abs(input_dev, ABS_PRESSURE, 7500);
input_sync(input_dev);
} else
ts_dev->bufferedmeasure = 1;
@@ -256,6 +258,7 @@ static int __devinit atmel_tsadcc_probe(struct platform_device *pdev)
__set_bit(EV_ABS, input_dev->evbit);
input_set_abs_params(input_dev, ABS_X, 0, 0x3FF, 0, 0);
input_set_abs_params(input_dev, ABS_Y, 0, 0x3FF, 0, 0);
+ input_set_abs_params(input_dev, ABS_PRESSURE, 0, 15000, 0, 0);
input_set_capability(input_dev, EV_KEY, BTN_TOUCH);
8<-------------------------------------------
Best regards,
--
Nicolas Ferre
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