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coreboot-kgpe-d16/payloads/libpayload/drivers/i8042/keyboard.c
Duncan Laurie 5aa0e925bc libpayload: keyboard: Add option to ignore failures during init 
If keys are pressed at boot some keyboard controllers will not
properly respond with an ACK to commands, which results in the
keyboard_init function aborting before it adds the keyboard to the
input device list.

This same keyboard controller will manage to properly return keyboard
data when keys are pressed later, so it is possible for it to be
functional in the payload even if it does not respond properly to
every command during initialization.

In order to allow payloads to use the keyboard when this happens a
new Kconfig option is added to ignore the keyboard ACK response and
always add the keyboard to the input device list.  This option is
disabled by default and must be enabled by the specific boards that
need it.

BUG=b:126633269
TEST=boot on device with this controller and press keys during boot
and see that the keyboard is still functional in the payload.

Change-Id: Icc6053f99804f1b57d785cb04235b5c4b8d5426f
Signed-off-by: Duncan Laurie <dlaurie@google.com>
Reviewed-on: https://review.coreboot.org/c/31657
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Furquan Shaikh <furquan@google.com>
Reviewed-by: Paul Menzel <paulepanter@users.sourceforge.net>
2019-03-02 06:17:36 +00:00

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/*
* This file is part of the libpayload project.
*
* Copyright (C) 2008 Advanced Micro Devices, Inc.
* Copyright (C) 2017 Patrick Rudolph <siro@das-labor.org>
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 3. The name of the author may not be used to endorse or promote products
* derived from this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*/
#include <keycodes.h>
#include <libpayload-config.h>
#include <libpayload.h>
#include "i8042.h"
#define POWER_BUTTON 0x90
struct layout_maps {
const char *country;
const unsigned short map[4][0x57];
};
static struct layout_maps *map;
static int modifier = 0;
static struct layout_maps keyboard_layouts[] = {
#if IS_ENABLED(CONFIG_LP_PC_KEYBOARD_LAYOUT_US)
{ .country = "us", .map = {
{ /* No modifier */
0x00, 0x1B, 0x31, 0x32, 0x33, 0x34, 0x35, 0x36,
0x37, 0x38, 0x39, 0x30, 0x2D, 0x3D, 0x08, 0x09,
0x71, 0x77, 0x65, 0x72, 0x74, 0x79, 0x75, 0x69,
0x6F, 0x70, 0x5B, 0x5D, 0x0A, 0x00, 0x61, 0x73,
0x64, 0x66, 0x67, 0x68, 0x6A, 0x6B, 0x6C, 0x3B,
0x27, 0x60, 0x00, 0x5C, 0x7A, 0x78, 0x63, 0x76,
0x62, 0x6E, 0x6D, 0x2C, 0x2E, 0x2F, 0x00, 0x2A,
0x00, 0x20, 0x00, KEY_F(1), KEY_F(2), KEY_F(3), KEY_F(4), KEY_F(5),
KEY_F(6), KEY_F(7), KEY_F(8), KEY_F(9), KEY_F(10), 0x00, 0x00, KEY_HOME,
KEY_UP, KEY_NPAGE, 0x00, KEY_LEFT, 0x00, KEY_RIGHT, 0x00, KEY_END,
KEY_DOWN, KEY_PPAGE, 0x00, KEY_DC, 0x00, 0x00, 0x00
},
{ /* Shift */
0x00, 0x1B, 0x21, 0x40, 0x23, 0x24, 0x25, 0x5E,
0x26, 0x2A, 0x28, 0x29, 0x5F, 0x2B, 0x08, 0x00,
0x51, 0x57, 0x45, 0x52, 0x54, 0x59, 0x55, 0x49,
0x4F, 0x50, 0x7B, 0x7D, 0x0A, 0x00, 0x41, 0x53,
0x44, 0x46, 0x47, 0x48, 0x4A, 0x4B, 0x4C, 0x3A,
0x22, 0x7E, 0x00, 0x7C, 0x5A, 0x58, 0x43, 0x56,
0x42, 0x4E, 0x4D, 0x3C, 0x3E, 0x3F, 0x00, 0x2A,
0x00, 0x20, 0x00, KEY_F(1), KEY_F(2), KEY_F(3), KEY_F(4), KEY_F(5),
KEY_F(6), KEY_F(7), KEY_F(8), KEY_F(9), KEY_F(10), 0x00, 0x00, KEY_HOME,
KEY_UP, KEY_NPAGE, 0x00, KEY_LEFT, 0x00, KEY_RIGHT, 0x00, KEY_END,
KEY_DOWN, KEY_PPAGE, 0x00, KEY_DC, 0x00, 0x00, 0x00
},
{ /* ALT */
0x00, 0x1B, 0x31, 0x32, 0x33, 0x34, 0x35, 0x36,
0x37, 0x38, 0x39, 0x30, 0x2D, 0x3D, 0x08, 0x09,
0x71, 0x77, 0x65, 0x72, 0x74, 0x79, 0x75, 0x69,
0x6F, 0x70, 0x5B, 0x5D, 0x0A, 0x00, 0x61, 0x73,
0x64, 0x66, 0x67, 0x68, 0x6A, 0x6B, 0x6C, 0x3B,
0x27, 0x60, 0x00, 0x5C, 0x7A, 0x78, 0x63, 0x76,
0x62, 0x6E, 0x6D, 0x2C, 0x2E, 0x2F, 0x00, 0x2A,
0x00, 0x20, 0x00, KEY_F(1), KEY_F(2), KEY_F(3), KEY_F(4), KEY_F(5),
KEY_F(6), KEY_F(7), KEY_F(8), KEY_F(9), KEY_F(10), 0x00, 0x00, KEY_HOME,
KEY_UP, KEY_NPAGE, 0x00, KEY_LEFT, 0x00, KEY_RIGHT, 0x00, KEY_END,
KEY_DOWN, KEY_PPAGE, 0x00, KEY_DC, 0x00, 0x00, 0x00
},
{ /* Shift-ALT */
0x00, 0x1B, 0x21, 0x40, 0x23, 0x24, 0x25, 0x5E,
0x26, 0x2A, 0x28, 0x29, 0x5F, 0x2B, 0x08, 0x00,
0x51, 0x57, 0x45, 0x52, 0x54, 0x59, 0x55, 0x49,
0x4F, 0x50, 0x7B, 0x7D, 0x0A, 0x00, 0x41, 0x53,
0x44, 0x46, 0x47, 0x48, 0x4A, 0x4B, 0x4C, 0x3A,
0x22, 0x7E, 0x00, 0x7C, 0x5A, 0x58, 0x43, 0x56,
0x42, 0x4E, 0x4D, 0x3C, 0x3E, 0x3F, 0x00, 0x2A,
0x00, 0x20, 0x00, KEY_F(1), KEY_F(2), KEY_F(3), KEY_F(4), KEY_F(5),
KEY_F(6), KEY_F(7), KEY_F(8), KEY_F(9), KEY_F(10), 0x00, 0x00, KEY_HOME,
KEY_UP, KEY_NPAGE, 0x00, KEY_LEFT, 0x00, KEY_RIGHT, 0x00, KEY_END,
KEY_DOWN, KEY_PPAGE, 0x00, KEY_DC, 0x00, 0x00, 0x00
}
}},
#endif
#if IS_ENABLED(CONFIG_LP_PC_KEYBOARD_LAYOUT_DE)
{ .country = "de", .map = {
{ /* No modifier */
0x00, 0x1B, 0x31, 0x32, 0x33, 0x34, 0x35, 0x36,
0x37, 0x38, 0x39, 0x30, 0x00, 0x27, 0x08, 0x09,
0x71, 0x77, 0x65, 0x72, 0x74, 0x7A, 0x75, 0x69,
0x6F, 0x70, 0x00, 0x2B, 0x0A, 0x00, 0x61, 0x73,
0x64, 0x66, 0x67, 0x68, 0x6A, 0x6B, 0x6C, 0x00,
0x00, 0x5E, 0x00, 0x23, 0x79, 0x78, 0x63, 0x76,
0x62, 0x6E, 0x6D, 0x2C, 0x2E, 0x2D, 0x00, 0x2A,
0x00, 0x20, 0x00, KEY_F(1), KEY_F(2), KEY_F(3), KEY_F(4), KEY_F(5),
KEY_F(6), KEY_F(7), KEY_F(8), KEY_F(9), KEY_F(10), 0x00, 0x00, KEY_HOME,
KEY_UP, KEY_NPAGE, 0x00, KEY_LEFT, 0x00, KEY_RIGHT, 0x00, KEY_END,
KEY_DOWN, KEY_PPAGE, 0x00, KEY_DC, 0x00, 0x00, 0x3C
},
{ /* Shift */
0x00, 0x1B, 0x21, 0x22, 0xA7, 0x24, 0x25, 0x26,
0x2F, 0x28, 0x29, 0x3D, 0x3F, 0x60, 0x08, 0x00,
0x51, 0x57, 0x45, 0x52, 0x54, 0x5A, 0x55, 0x49,
0x4F, 0x50, 0x00, 0x2A, 0x0A, 0x00, 0x41, 0x53,
0x44, 0x46, 0x47, 0x48, 0x4A, 0x4B, 0x4C, 0x00,
0x00, 0x7E, 0x00, 0x27, 0x59, 0x58, 0x43, 0x56,
0x42, 0x4E, 0x4D, 0x3B, 0x3A, 0x5F, 0x00, 0x2A,
0x00, 0x20, 0x00, KEY_F(1), KEY_F(2), KEY_F(3), KEY_F(4), KEY_F(5),
KEY_F(6), KEY_F(7), KEY_F(8), KEY_F(9), KEY_F(10), 0x00, 0x00, KEY_HOME,
KEY_UP, KEY_NPAGE, 0x00, KEY_LEFT, 0x00, KEY_RIGHT, 0x00, KEY_END,
KEY_DOWN, KEY_PPAGE, 0x00, KEY_DC, 0x00, 0x00, 0x3E
},
{ /* ALT */
0x00, 0x1B, 0x31, 0x32, 0x33, 0x34, 0x35, 0x36,
0x7B, 0x5B, 0x5D, 0x7D, 0x5C, 0x3D, 0x08, 0x09,
0x40, 0x77, 0x65, 0x72, 0x74, 0x79, 0x75, 0x69,
0x6F, 0x70, 0x5B, 0x7E, 0x0A, 0x00, 0x61, 0x73,
0x64, 0x66, 0x67, 0x68, 0x6A, 0x6B, 0x6C, 0x3B,
0x27, 0x60, 0x00, 0x5C, 0x7A, 0x78, 0x63, 0x76,
0x62, 0x6E, 0x6D, 0x2C, 0x2E, 0x2F, 0x00, 0x2A,
0x00, 0x20, 0x00, KEY_F(1), KEY_F(2), KEY_F(3), KEY_F(4), KEY_F(5),
KEY_F(6), KEY_F(7), KEY_F(8), KEY_F(9), KEY_F(10), 0x00, 0x00, KEY_HOME,
KEY_UP, KEY_NPAGE, 0x00, KEY_LEFT, 0x00, KEY_RIGHT, 0x00, KEY_END,
KEY_DOWN, KEY_PPAGE, 0x00, KEY_DC, 0x00, 0x00, 0x7C
},
{ /* Shift-ALT */
/* copied from US */
0x00, 0x1B, 0x21, 0x40, 0x23, 0x24, 0x25, 0x5E,
0x26, 0x2A, 0x28, 0x29, 0x5F, 0x2B, 0x08, 0x00,
0x51, 0x57, 0x45, 0x52, 0x54, 0x59, 0x55, 0x49,
0x4F, 0x50, 0x7B, 0x7D, 0x0A, 0x00, 0x41, 0x53,
0x44, 0x46, 0x47, 0x48, 0x4A, 0x4B, 0x4C, 0x3A,
0x22, 0x7E, 0x00, 0x7C, 0x5A, 0x58, 0x43, 0x56,
0x42, 0x4E, 0x4D, 0x3C, 0x3E, 0x3F, 0x00, 0x2A,
0x00, 0x20, 0x00, KEY_F(1), KEY_F(2), KEY_F(3), KEY_F(4), KEY_F(5),
KEY_F(6), KEY_F(7), KEY_F(8), KEY_F(9), KEY_F(10), 0x00, 0x00, KEY_HOME,
KEY_UP, KEY_NPAGE, 0x00, KEY_LEFT, 0x00, KEY_RIGHT, 0x00, KEY_END,
KEY_DOWN, KEY_PPAGE, 0x00, KEY_DC, 0x00, 0x00, 0x00
}
}},
#endif
};
static unsigned char keyboard_cmd(unsigned char cmd)
{
i8042_write_data(cmd);
return i8042_wait_read_ps2() == 0xfa;
}
int keyboard_havechar(void)
{
return i8042_data_ready_ps2();
}
unsigned char keyboard_get_scancode(void)
{
unsigned char ch;
while (!keyboard_havechar()) ;
ch = i8042_read_data_ps2();
switch (ch) {
case 0x36:
case 0x2a:
modifier |= KB_MOD_SHIFT;
break;
case 0x80 | 0x36:
case 0x80 | 0x2a:
modifier &= ~KB_MOD_SHIFT;
break;
case 0x38:
modifier |= KB_MOD_ALT;
break;
case 0x80 | 0x38:
modifier &= ~KB_MOD_ALT;
break;
case 0x1d:
modifier |= KB_MOD_CTRL;
break;
case 0x80 | 0x1d:
modifier &= ~KB_MOD_CTRL;
break;
case 0x3a:
if (modifier & KB_MOD_CAPSLOCK) {
modifier &= ~KB_MOD_CAPSLOCK;
if (keyboard_cmd(I8042_KBCMD_SET_MODE_IND))
keyboard_cmd(I8042_MODE_CAPS_LOCK_OFF);
} else {
modifier |= KB_MOD_CAPSLOCK;
if (keyboard_cmd(I8042_KBCMD_SET_MODE_IND))
keyboard_cmd(I8042_MODE_CAPS_LOCK_ON);
}
break;
}
return ch;
}
int keyboard_getmodifier(void)
{
return modifier;
}
int keyboard_getchar(void)
{
unsigned char ch;
int shift;
int ret = 0;
while (!keyboard_havechar()) ;
ch = keyboard_get_scancode();
if (!(ch & 0x80) && ch < 0x57) {
shift =
(modifier & KB_MOD_SHIFT) ^ (modifier & KB_MOD_CAPSLOCK) ? 1 : 0;
if (modifier & KB_MOD_ALT)
shift += 2;
ret = map->map[shift][ch];
if (modifier & KB_MOD_CTRL) {
switch (ret) {
case 'a' ... 'z':
ret &= 0x1f;
break;
case KEY_DC:
/* vulcan nerve pinch */
if ((modifier & KB_MOD_ALT) && reset_handler)
reset_handler();
default:
ret = 0;
}
}
}
if (ch == 0x5e)
ret = POWER_BUTTON;
return ret;
}
/**
* Set keyboard layout
* @param country string describing the keyboard layout language.
* Valid values are "us", "de".
*/
int keyboard_set_layout(char *country)
{
int i;
for (i=0; i<ARRAY_SIZE(keyboard_layouts); i++) {
if (strncmp(keyboard_layouts[i].country, country,
strlen(keyboard_layouts[i].country)))
continue;
/* Found, changing keyboard layout */
map = &keyboard_layouts[i];
return 0;
}
/* Nothing found, not changed */
return -1;
}
static struct console_input_driver cons = {
.havekey = keyboard_havechar,
.getchar = keyboard_getchar
};
void keyboard_init(void)
{
unsigned int ret;
map = &keyboard_layouts[0];
/* Initialized keyboard controller. */
if (!i8042_probe() || !i8042_has_ps2())
return;
/* Empty keyboard buffer */
while (keyboard_havechar())
keyboard_getchar();
/* Enable first PS/2 port */
i8042_cmd(I8042_CMD_EN_KB);
/* Set scancode set 1 */
ret = keyboard_cmd(I8042_KBCMD_SET_SCANCODE);
if (!ret && !IS_ENABLED(CONFIG_LP_PC_KEYBOARD_IGNORE_INIT_FAILURE))
return;
ret = keyboard_cmd(I8042_SCANCODE_SET_1);
if (!ret && !IS_ENABLED(CONFIG_LP_PC_KEYBOARD_IGNORE_INIT_FAILURE))
return;
/* Enable scanning */
ret = keyboard_cmd(I8042_KBCMD_EN);
if (!ret && !IS_ENABLED(CONFIG_LP_PC_KEYBOARD_IGNORE_INIT_FAILURE))
return;
console_add_input_driver(&cons);
}
void keyboard_disconnect(void)
{
/* If 0x64 returns 0xff, then we have no keyboard
* controller */
if (inb(0x64) == 0xFF)
return;
if (!i8042_has_ps2())
return;
/* Empty keyboard buffer */
while (keyboard_havechar())
keyboard_getchar();
/* Disable scanning */
keyboard_cmd(I8042_KBCMD_DEFAULT_DIS);
/* Send keyboard disconnect command */
i8042_cmd(I8042_CMD_DIS_KB);
/* Hand off with empty buffer */
while (keyboard_havechar())
keyboard_getchar();
/* Release keyboard controller driver */
i8042_close();
}
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