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arm_coreboot: Add Chromebook keyboard driver.

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This commit is contained in:
Vladimir Serbinenko 2017-05-09 08:47:34 +02:00
parent b0b1b81a11
commit 5c3fd1b135
3 changed files with 384 additions and 0 deletions
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125
grub-core/term/arm/cros.c Normal file
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/*
* GRUB -- GRand Unified Bootloader
*
* Copyright (C) 2012 Google Inc.
* Copyright (C) 2016 Free Software Foundation, Inc.
*
* This is based on depthcharge code.
*
* GRUB is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
*
* GRUB is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with GRUB. If not, see <http://www.gnu.org/licenses/>.
*/
#include <grub/ps2.h>
#include <grub/fdtbus.h>
#include <grub/err.h>
#include <grub/machine/kernel.h>
#include <grub/misc.h>
#include <grub/term.h>
#include <grub/time.h>
#include <grub/fdtbus.h>
#include <grub/arm/cros_ec.h>
struct grub_ps2_state ps2_state;
struct grub_cros_ec_keyscan old_scan;
static const struct grub_fdtbus_dev *cros_ec;
static grub_uint8_t map_code[GRUB_CROS_EC_KEYSCAN_COLS][GRUB_CROS_EC_KEYSCAN_ROWS];
static grub_uint8_t e0_translate[16] =
{
0x1c, 0x1d, 0x35, 0x00,
0x38, 0x00, 0x47, 0x48,
0x49, 0x4b, 0x4d, 0x4f,
0x50, 0x51, 0x52, 0x53,
};
/* If there is a character pending, return it;
otherwise return GRUB_TERM_NO_KEY. */
static int
grub_cros_keyboard_getkey (struct grub_term_input *term __attribute__ ((unused)))
{
struct grub_cros_ec_keyscan scan;
int i, j;
if (grub_cros_ec_scan_keyboard (cros_ec, &scan) < 0)
return GRUB_TERM_NO_KEY;
for (i = 0; i < GRUB_CROS_EC_KEYSCAN_COLS; i++)
if (scan.data[i] ^ old_scan.data[i])
for (j = 0; j < GRUB_CROS_EC_KEYSCAN_ROWS; j++)
if ((scan.data[i] ^ old_scan.data[i]) & (1 << j))
{
grub_uint8_t code = map_code[i][j];
int ret;
grub_uint8_t brk = 0;
if (!(scan.data[i] & (1 << j)))
brk = 0x80;
grub_dprintf ("cros_keyboard", "key <%d, %d> code %x\n", i, j, code);
if (code < 0x60)
ret = grub_ps2_process_incoming_byte (&ps2_state, code | brk);
else if (code >= 0x60 && code < 0x70 && e0_translate[code - 0x60])
{
grub_ps2_process_incoming_byte (&ps2_state, 0xe0);
ret = grub_ps2_process_incoming_byte (&ps2_state, e0_translate[code - 0x60] | brk);
}
else
ret = GRUB_TERM_NO_KEY;
old_scan.data[i] ^= (1 << j);
if (ret != GRUB_TERM_NO_KEY)
return ret;
}
return GRUB_TERM_NO_KEY;
}
static struct grub_term_input grub_cros_keyboard_term =
{
.name = "cros_keyboard",
.getkey = grub_cros_keyboard_getkey
};
static grub_err_t
cros_attach (const struct grub_fdtbus_dev *dev)
{
grub_size_t keymap_size, i;
const grub_uint8_t *keymap = grub_fdtbus_get_prop (dev, "linux,keymap", &keymap_size);
if (!dev->parent || !grub_cros_ec_validate (dev->parent))
return GRUB_ERR_IO;
if (keymap)
{
for (i = 0; i + 3 < keymap_size; i += 4)
if (keymap[i+1] < GRUB_CROS_EC_KEYSCAN_COLS && keymap[i] < GRUB_CROS_EC_KEYSCAN_ROWS
&& keymap[i+2] == 0 && keymap[i+3] < 0x80)
map_code[keymap[i+1]][keymap[i]] = keymap[i+3];
}
cros_ec = dev->parent;
ps2_state.current_set = 1;
ps2_state.at_keyboard_status = 0;
grub_term_register_input ("cros_keyboard", &grub_cros_keyboard_term);
return GRUB_ERR_NONE;
}
static struct grub_fdtbus_driver cros =
{
.compatible = "google,cros-ec-keyb",
.attach = cros_attach
};
void
grub_cros_init (void)
{
grub_fdtbus_register (&cros);
}