u-boot/drivers/input/i8042.c

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/*
* (C) Copyright 2002 ELTEC Elektronik AG
* Frank Gottschling <fgottschling@eltec.de>
*
* SPDX-License-Identifier: GPL-2.0+
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*/
/* i8042.c - Intel 8042 keyboard driver routines */
#include <common.h>
#include <dm.h>
#include <errno.h>
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#include <i8042.h>
#include <input.h>
#include <keyboard.h>
#include <asm/io.h>
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DECLARE_GLOBAL_DATA_PTR;
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/* defines */
#define in8(p) inb(p)
#define out8(p, v) outb(v, p)
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enum {
QUIRK_DUP_POR = 1 << 0,
};
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/* locals */
struct i8042_kbd_priv {
bool extended; /* true if an extended keycode is expected next */
int quirks; /* quirks that we support */
};
static unsigned char ext_key_map[] = {
0x1c, /* keypad enter */
0x1d, /* right control */
0x35, /* keypad slash */
0x37, /* print screen */
0x38, /* right alt */
0x46, /* break */
0x47, /* editpad home */
0x48, /* editpad up */
0x49, /* editpad pgup */
0x4b, /* editpad left */
0x4d, /* editpad right */
0x4f, /* editpad end */
0x50, /* editpad dn */
0x51, /* editpad pgdn */
0x52, /* editpad ins */
0x53, /* editpad del */
0x00 /* map end */
};
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static int kbd_input_empty(void)
{
int kbd_timeout = KBD_TIMEOUT * 1000;
while ((in8(I8042_STS_REG) & STATUS_IBF) && kbd_timeout--)
udelay(1);
return kbd_timeout != -1;
}
static int kbd_output_full(void)
{
int kbd_timeout = KBD_TIMEOUT * 1000;
while (((in8(I8042_STS_REG) & STATUS_OBF) == 0) && kbd_timeout--)
udelay(1);
return kbd_timeout != -1;
}
/**
* check_leds() - Check the keyboard LEDs and update them it needed
*
* @ret: Value to return
* @return value of @ret
*/
static int i8042_kbd_update_leds(struct udevice *dev, int leds)
{
kbd_input_empty();
out8(I8042_DATA_REG, CMD_SET_KBD_LED);
kbd_input_empty();
out8(I8042_DATA_REG, leds & 0x7);
return 0;
}
static int kbd_write(int reg, int value)
{
if (!kbd_input_empty())
return -1;
out8(reg, value);
return 0;
}
static int kbd_read(int reg)
{
if (!kbd_output_full())
return -1;
return in8(reg);
}
static int kbd_cmd_read(int cmd)
{
if (kbd_write(I8042_CMD_REG, cmd))
return -1;
return kbd_read(I8042_DATA_REG);
}
static int kbd_cmd_write(int cmd, int data)
{
if (kbd_write(I8042_CMD_REG, cmd))
return -1;
return kbd_write(I8042_DATA_REG, data);
}
static int kbd_reset(int quirk)
{
int config;
/* controller self test */
if (kbd_cmd_read(CMD_SELF_TEST) != KBC_TEST_OK)
goto err;
/* keyboard reset */
if (kbd_write(I8042_DATA_REG, CMD_RESET_KBD) ||
kbd_read(I8042_DATA_REG) != KBD_ACK ||
kbd_read(I8042_DATA_REG) != KBD_POR)
goto err;
if (kbd_write(I8042_DATA_REG, CMD_DRAIN_OUTPUT) ||
kbd_read(I8042_DATA_REG) != KBD_ACK)
goto err;
/* set AT translation and disable irq */
config = kbd_cmd_read(CMD_RD_CONFIG);
if (config == -1)
goto err;
/* Sometimes get a second byte */
else if ((quirk & QUIRK_DUP_POR) && config == KBD_POR)
config = kbd_cmd_read(CMD_RD_CONFIG);
config |= CONFIG_AT_TRANS;
config &= ~(CONFIG_KIRQ_EN | CONFIG_MIRQ_EN);
if (kbd_cmd_write(CMD_WR_CONFIG, config))
goto err;
/* enable keyboard */
if (kbd_write(I8042_CMD_REG, CMD_KBD_EN) ||
!kbd_input_empty())
goto err;
return 0;
err:
debug("%s: Keyboard failure\n", __func__);
return -1;
}
static int kbd_controller_present(void)
{
return in8(I8042_STS_REG) != 0xff;
}
/*
* Implement a weak default function for boards that optionally
* need to skip the i8042 initialization.
*
* TODO(sjg@chromium.org): Use device tree for this?
*/
int __weak board_i8042_skip(void)
{
/* As default, don't skip */
return 0;
}
void i8042_flush(void)
{
int timeout;
/*
* The delay is to give the keyboard controller some time
* to fill the next byte.
*/
while (1) {
timeout = 100; /* wait for no longer than 100us */
while (timeout > 0 && !(in8(I8042_STS_REG) & STATUS_OBF)) {
udelay(1);
timeout--;
}
/* Try to pull next byte if not timeout */
if (in8(I8042_STS_REG) & STATUS_OBF)
in8(I8042_DATA_REG);
else
break;
}
}
int i8042_disable(void)
{
if (kbd_input_empty() == 0)
return -1;
/* Disable keyboard */
out8(I8042_CMD_REG, CMD_KBD_DIS);
if (kbd_input_empty() == 0)
return -1;
return 0;
}
static int i8042_kbd_check(struct input_config *input)
{
struct i8042_kbd_priv *priv = dev_get_priv(input->dev);
if ((in8(I8042_STS_REG) & STATUS_OBF) == 0) {
return 0;
} else {
bool release = false;
int scan_code;
int i;
scan_code = in8(I8042_DATA_REG);
if (scan_code == 0xfa) {
return 0;
} else if (scan_code == 0xe0) {
priv->extended = true;
return 0;
}
if (scan_code & 0x80) {
scan_code &= 0x7f;
release = true;
}
if (priv->extended) {
priv->extended = false;
for (i = 0; ext_key_map[i]; i++) {
if (ext_key_map[i] == scan_code) {
scan_code = 0x60 + i;
break;
}
}
/* not found ? */
if (!ext_key_map[i])
return 0;
}
input_add_keycode(input, scan_code, release);
return 1;
}
}
/* i8042_kbd_init - reset keyboard and init state flags */
static int i8042_start(struct udevice *dev)
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{
struct keyboard_priv *uc_priv = dev_get_uclass_priv(dev);
struct i8042_kbd_priv *priv = dev_get_priv(dev);
struct input_config *input = &uc_priv->input;
int keymap, try;
char *penv;
int ret;
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if (!kbd_controller_present() || board_i8042_skip()) {
debug("i8042 keyboard controller is not present\n");
return -ENOENT;
}
/* Init keyboard device (default US layout) */
keymap = KBD_US;
penv = getenv("keymap");
if (penv != NULL) {
if (strncmp(penv, "de", 3) == 0)
keymap = KBD_GER;
}
for (try = 0; kbd_reset(priv->quirks) != 0; try++) {
if (try >= KBD_RESET_TRIES)
return -1;
}
ret = input_add_tables(input, keymap == KBD_GER);
if (ret)
return ret;
i8042_kbd_update_leds(dev, NORMAL);
debug("%s: started\n", __func__);
return 0;
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}
/**
* Set up the i8042 keyboard. This is called by the stdio device handler
*
* We want to do this init when the keyboard is actually used rather than
* at start-up, since keyboard input may not currently be selected.
*
* Once the keyboard starts there will be a period during which we must
* wait for the keyboard to init. We do this only when a key is first
* read - see kbd_wait_for_fifo_init().
*
* @return 0 if ok, -ve on error
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*/
static int i8042_kbd_probe(struct udevice *dev)
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{
struct keyboard_priv *uc_priv = dev_get_uclass_priv(dev);
struct i8042_kbd_priv *priv = dev_get_priv(dev);
struct stdio_dev *sdev = &uc_priv->sdev;
struct input_config *input = &uc_priv->input;
int ret;
if (fdtdec_get_bool(gd->fdt_blob, dev_of_offset(dev),
"intel,duplicate-por"))
priv->quirks |= QUIRK_DUP_POR;
/* Register the device. i8042_start() will be called soon */
input->dev = dev;
input->read_keys = i8042_kbd_check;
input_allow_repeats(input, true);
strcpy(sdev->name, "i8042-kbd");
ret = input_stdio_register(sdev);
if (ret) {
debug("%s: input_stdio_register() failed\n", __func__);
return ret;
}
debug("%s: ready\n", __func__);
return 0;
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}
static const struct keyboard_ops i8042_kbd_ops = {
.start = i8042_start,
.update_leds = i8042_kbd_update_leds,
};
static const struct udevice_id i8042_kbd_ids[] = {
{ .compatible = "intel,i8042-keyboard" },
{ }
};
U_BOOT_DRIVER(i8042_kbd) = {
.name = "i8042_kbd",
.id = UCLASS_KEYBOARD,
.of_match = i8042_kbd_ids,
.probe = i8042_kbd_probe,
.ops = &i8042_kbd_ops,
.priv_auto_alloc_size = sizeof(struct i8042_kbd_priv),
};