2 * (C) Copyright 2002 ELTEC Elektronik AG
3 * Frank Gottschling <fgottschling@eltec.de>
5 * SPDX-License-Identifier: GPL-2.0+
8 /* i8042.c - Intel 8042 keyboard driver routines */
18 DECLARE_GLOBAL_DATA_PTR
;
22 #define out8(p, v) outb(v, p)
25 QUIRK_DUP_POR
= 1 << 0,
29 struct i8042_kbd_priv
{
30 bool extended
; /* true if an extended keycode is expected next */
31 int quirks
; /* quirks that we support */
34 static unsigned char ext_key_map
[] = {
35 0x1c, /* keypad enter */
36 0x1d, /* right control */
37 0x35, /* keypad slash */
38 0x37, /* print screen */
41 0x47, /* editpad home */
42 0x48, /* editpad up */
43 0x49, /* editpad pgup */
44 0x4b, /* editpad left */
45 0x4d, /* editpad right */
46 0x4f, /* editpad end */
47 0x50, /* editpad dn */
48 0x51, /* editpad pgdn */
49 0x52, /* editpad ins */
50 0x53, /* editpad del */
54 static int kbd_input_empty(void)
56 int kbd_timeout
= KBD_TIMEOUT
* 1000;
58 while ((in8(I8042_STS_REG
) & STATUS_IBF
) && kbd_timeout
--)
61 return kbd_timeout
!= -1;
64 static int kbd_output_full(void)
66 int kbd_timeout
= KBD_TIMEOUT
* 1000;
68 while (((in8(I8042_STS_REG
) & STATUS_OBF
) == 0) && kbd_timeout
--)
71 return kbd_timeout
!= -1;
75 * check_leds() - Check the keyboard LEDs and update them it needed
77 * @ret: Value to return
78 * @return value of @ret
80 static int i8042_kbd_update_leds(struct udevice
*dev
, int leds
)
83 out8(I8042_DATA_REG
, CMD_SET_KBD_LED
);
85 out8(I8042_DATA_REG
, leds
& 0x7);
90 static int kbd_write(int reg
, int value
)
92 if (!kbd_input_empty())
99 static int kbd_read(int reg
)
101 if (!kbd_output_full())
107 static int kbd_cmd_read(int cmd
)
109 if (kbd_write(I8042_CMD_REG
, cmd
))
112 return kbd_read(I8042_DATA_REG
);
115 static int kbd_cmd_write(int cmd
, int data
)
117 if (kbd_write(I8042_CMD_REG
, cmd
))
120 return kbd_write(I8042_DATA_REG
, data
);
123 static int kbd_reset(int quirk
)
127 /* controller self test */
128 if (kbd_cmd_read(CMD_SELF_TEST
) != KBC_TEST_OK
)
132 if (kbd_write(I8042_DATA_REG
, CMD_RESET_KBD
) ||
133 kbd_read(I8042_DATA_REG
) != KBD_ACK
||
134 kbd_read(I8042_DATA_REG
) != KBD_POR
)
137 /* set AT translation and disable irq */
138 config
= kbd_cmd_read(CMD_RD_CONFIG
);
142 /* Sometimes get a second byte */
143 else if ((quirk
& QUIRK_DUP_POR
) && config
== KBD_POR
)
144 config
= kbd_cmd_read(CMD_RD_CONFIG
);
146 config
|= CONFIG_AT_TRANS
;
147 config
&= ~(CONFIG_KIRQ_EN
| CONFIG_MIRQ_EN
);
148 if (kbd_cmd_write(CMD_WR_CONFIG
, config
))
151 /* enable keyboard */
152 if (kbd_write(I8042_CMD_REG
, CMD_KBD_EN
) ||
158 debug("%s: Keyboard failure\n", __func__
);
162 static int kbd_controller_present(void)
164 return in8(I8042_STS_REG
) != 0xff;
168 * Implement a weak default function for boards that optionally
169 * need to skip the i8042 initialization.
171 * TODO(sjg@chromium.org): Use device tree for this?
173 int __weak
board_i8042_skip(void)
175 /* As default, don't skip */
179 void i8042_flush(void)
184 * The delay is to give the keyboard controller some time
185 * to fill the next byte.
188 timeout
= 100; /* wait for no longer than 100us */
189 while (timeout
> 0 && !(in8(I8042_STS_REG
) & STATUS_OBF
)) {
194 /* Try to pull next byte if not timeout */
195 if (in8(I8042_STS_REG
) & STATUS_OBF
)
202 int i8042_disable(void)
204 if (kbd_input_empty() == 0)
207 /* Disable keyboard */
208 out8(I8042_CMD_REG
, CMD_KBD_DIS
);
210 if (kbd_input_empty() == 0)
216 static int i8042_kbd_check(struct input_config
*input
)
218 struct i8042_kbd_priv
*priv
= dev_get_priv(input
->dev
);
220 if ((in8(I8042_STS_REG
) & STATUS_OBF
) == 0) {
223 bool release
= false;
227 scan_code
= in8(I8042_DATA_REG
);
228 if (scan_code
== 0xfa) {
230 } else if (scan_code
== 0xe0) {
231 priv
->extended
= true;
234 if (scan_code
& 0x80) {
238 if (priv
->extended
) {
239 priv
->extended
= false;
240 for (i
= 0; ext_key_map
[i
]; i
++) {
241 if (ext_key_map
[i
] == scan_code
) {
242 scan_code
= 0x60 + i
;
251 input_add_keycode(input
, scan_code
, release
);
256 /* i8042_kbd_init - reset keyboard and init state flags */
257 static int i8042_start(struct udevice
*dev
)
259 struct keyboard_priv
*uc_priv
= dev_get_uclass_priv(dev
);
260 struct i8042_kbd_priv
*priv
= dev_get_priv(dev
);
261 struct input_config
*input
= &uc_priv
->input
;
266 if (!kbd_controller_present() || board_i8042_skip()) {
267 debug("i8042 keyboard controller is not present\n");
271 /* Init keyboard device (default US layout) */
273 penv
= getenv("keymap");
275 if (strncmp(penv
, "de", 3) == 0)
279 for (try = 0; kbd_reset(priv
->quirks
) != 0; try++) {
280 if (try >= KBD_RESET_TRIES
)
284 ret
= input_add_tables(input
, keymap
== KBD_GER
);
288 i8042_kbd_update_leds(dev
, NORMAL
);
289 debug("%s: started\n", __func__
);
295 * Set up the i8042 keyboard. This is called by the stdio device handler
297 * We want to do this init when the keyboard is actually used rather than
298 * at start-up, since keyboard input may not currently be selected.
300 * Once the keyboard starts there will be a period during which we must
301 * wait for the keyboard to init. We do this only when a key is first
302 * read - see kbd_wait_for_fifo_init().
304 * @return 0 if ok, -ve on error
306 static int i8042_kbd_probe(struct udevice
*dev
)
308 struct keyboard_priv
*uc_priv
= dev_get_uclass_priv(dev
);
309 struct i8042_kbd_priv
*priv
= dev_get_priv(dev
);
310 struct stdio_dev
*sdev
= &uc_priv
->sdev
;
311 struct input_config
*input
= &uc_priv
->input
;
314 if (fdtdec_get_bool(gd
->fdt_blob
, dev
->of_offset
,
315 "intel,duplicate-por"))
316 priv
->quirks
|= QUIRK_DUP_POR
;
318 /* Register the device. i8042_start() will be called soon */
320 input
->read_keys
= i8042_kbd_check
;
321 input_allow_repeats(input
, true);
322 strcpy(sdev
->name
, "i8042-kbd");
323 ret
= input_stdio_register(sdev
);
325 debug("%s: input_stdio_register() failed\n", __func__
);
328 debug("%s: ready\n", __func__
);
333 static const struct keyboard_ops i8042_kbd_ops
= {
334 .start
= i8042_start
,
335 .update_leds
= i8042_kbd_update_leds
,
338 static const struct udevice_id i8042_kbd_ids
[] = {
339 { .compatible
= "intel,i8042-keyboard" },
343 U_BOOT_DRIVER(i8042_kbd
) = {
345 .id
= UCLASS_KEYBOARD
,
346 .of_match
= i8042_kbd_ids
,
347 .probe
= i8042_kbd_probe
,
348 .ops
= &i8042_kbd_ops
,
349 .priv_auto_alloc_size
= sizeof(struct i8042_kbd_priv
),