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ps2_drv: read configuration before self tests

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It turned out that the controller configuration can change during the self
tests, so now it is read before running the tests and restored afterwards.

Fixes #1260.
This commit is contained in:
Christian Prochaska 2014-09-25 13:49:19 +02:00 committed by Christian Helmuth
parent 81af714949
commit 0be264d7d2
1 changed files with 16 additions and 8 deletions
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24
repos/os/src/drivers/input/ps2/x86/i8042.h
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@ -231,37 +231,45 @@ class I8042
*/
void reset()
{
int ret;
unsigned char configuration;
unsigned char ret;
/* disable keyboard and mouse */
_command(CMD_KBD_DISABLE);
_command(CMD_AUX_DISABLE);
/* read remaining data in controller */
while (_output_buffer_full()) _data();
/* get configuration (can change during the self tests) */
_command(CMD_READ);
configuration = _wait_data();
/* query xlate bit */
_kbd_xlate = !!(configuration & CTRL_XLATE);
/* run self tests */
_command(CMD_TEST);
if ((ret = _wait_data()) != RET_TEST_OK) {
Genode::printf("i8042: self test failed (%x)\n", ret);
return;
}
_command(CMD_KBD_TEST);
if ((ret = _wait_data()) != RET_KBD_TEST_OK) {
Genode::printf("i8042: kbd test failed (%x)\n", ret);
return;
}
_command(CMD_AUX_TEST);
if ((ret = _wait_data()) != RET_AUX_TEST_OK) {
Genode::printf("i8042: aux test failed (%x)\n", ret);
return;
}
/* query xlate bit */
_command(CMD_READ);
ret = _wait_data();
_kbd_xlate = !!(ret & CTRL_XLATE);
/* enable interrupts for keyboard and mouse at the controller */
ret |= CTRL_KBD_INT | CTRL_AUX_INT;
configuration |= CTRL_KBD_INT | CTRL_AUX_INT;
_command(CMD_WRITE);
_data(ret);
_data(configuration);
/* enable keyboard and mouse */
_command(CMD_KBD_ENABLE);