libpayload/i8042: Add API to get/set kbd translation state

Change-Id: I49aa1c244cb60ea290df102f06f641c765f59fa5
Signed-off-by: Nico Huber <nico.h@gmx.de>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/47589
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Angel Pons <th3fanbus@gmail.com>
This commit is contained in:
Nico Huber 2020-11-08 14:04:39 +01:00 committed by Hung-Te Lin
parent 683c95e4ab
commit 0e1d19baa6
2 changed files with 55 additions and 0 deletions

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@ -28,6 +28,7 @@
#include <libpayload-config.h> #include <libpayload-config.h>
#include <libpayload.h> #include <libpayload.h>
#include <stdbool.h>
#include <stddef.h> #include <stddef.h>
#include "i8042.h" #include "i8042.h"
@ -318,6 +319,24 @@ void i8042_write_data(u8 data)
return; return;
} }
/**
* Send command & data to keyboard controller.
*
* @param cmd: The command to be sent.
* @param data: The data to be sent.
* Returns 0 on success, -1 on failure.
*/
static int i8042_cmd_with_data(const u8 cmd, const u8 data)
{
const int ret = i8042_cmd(cmd);
if (ret != 0)
return ret;
i8042_write_data(data);
return ret;
}
/** /**
* Probe for keyboard controller data and queue it. * Probe for keyboard controller data and queue it.
*/ */
@ -408,3 +427,36 @@ int i8042_wait_read_aux(void)
return (retries <= 0) ? -1 : i8042_read_data_aux(); return (retries <= 0) ? -1 : i8042_read_data_aux();
} }
/**
* Get the keyboard scancode translation state.
*
* Returns: -1 on timeout, 1 if the controller translates
* scancode set #2 to #1, and 0 if not.
*/
int i8042_get_kbd_translation(void)
{
const int cfg = i8042_cmd_with_response(I8042_CMD_RD_CMD_BYTE);
if (cfg < 0)
return cfg;
return !!(cfg & I8042_CMD_BYTE_XLATE);
}
/**
* Sets the keyboard scancode translation state.
*
* Returns: -1 on timeout, 0 otherwise.
*/
int i8042_set_kbd_translation(const bool xlate)
{
int cfg = i8042_cmd_with_response(I8042_CMD_RD_CMD_BYTE);
if (cfg < 0)
return cfg;
if (xlate)
cfg |= I8042_CMD_BYTE_XLATE;
else
cfg &= ~I8042_CMD_BYTE_XLATE;
return i8042_cmd_with_data(I8042_CMD_WR_CMD_BYTE, cfg);
}

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@ -238,6 +238,9 @@ u8 i8042_read_data_aux(void);
int i8042_wait_read_ps2(void); int i8042_wait_read_ps2(void);
int i8042_wait_read_aux(void); int i8042_wait_read_aux(void);
int i8042_get_kbd_translation(void);
int i8042_set_kbd_translation(bool xlate);
/** @} */ /** @} */
/** /**