1 // SPDX-License-Identifier: GPL-2.0+
3 * (C) Copyright 2002 ELTEC Elektronik AG
4 * Frank Gottschling <fgottschling@eltec.de>
7 /* i8042.c - Intel 8042 keyboard driver routines */
17 DECLARE_GLOBAL_DATA_PTR;
21 #define out8(p, v) outb(v, p)
24 QUIRK_DUP_POR = 1 << 0,
28 struct i8042_kbd_priv {
29 bool extended; /* true if an extended keycode is expected next */
30 int quirks; /* quirks that we support */
33 static unsigned char ext_key_map[] = {
34 0x1c, /* keypad enter */
35 0x1d, /* right control */
36 0x35, /* keypad slash */
37 0x37, /* print screen */
40 0x47, /* editpad home */
41 0x48, /* editpad up */
42 0x49, /* editpad pgup */
43 0x4b, /* editpad left */
44 0x4d, /* editpad right */
45 0x4f, /* editpad end */
46 0x50, /* editpad dn */
47 0x51, /* editpad pgdn */
48 0x52, /* editpad ins */
49 0x53, /* editpad del */
53 static int kbd_input_empty(void)
55 int kbd_timeout = KBD_TIMEOUT * 1000;
57 while ((in8(I8042_STS_REG) & STATUS_IBF) && kbd_timeout--)
60 return kbd_timeout != -1;
63 static int kbd_output_full(void)
65 int kbd_timeout = KBD_TIMEOUT * 1000;
67 while (((in8(I8042_STS_REG) & STATUS_OBF) == 0) && kbd_timeout--)
70 return kbd_timeout != -1;
74 * check_leds() - Check the keyboard LEDs and update them it needed
76 * @ret: Value to return
77 * @return value of @ret
79 static int i8042_kbd_update_leds(struct udevice *dev, int leds)
82 out8(I8042_DATA_REG, CMD_SET_KBD_LED);
84 out8(I8042_DATA_REG, leds & 0x7);
89 static int kbd_write(int reg, int value)
91 if (!kbd_input_empty())
98 static int kbd_read(int reg)
100 if (!kbd_output_full())
106 static int kbd_cmd_read(int cmd)
108 if (kbd_write(I8042_CMD_REG, cmd))
111 return kbd_read(I8042_DATA_REG);
114 static int kbd_cmd_write(int cmd, int data)
116 if (kbd_write(I8042_CMD_REG, cmd))
119 return kbd_write(I8042_DATA_REG, data);
122 static int kbd_reset(int quirk)
126 /* controller self test */
127 if (kbd_cmd_read(CMD_SELF_TEST) != KBC_TEST_OK)
131 if (kbd_write(I8042_DATA_REG, CMD_RESET_KBD) ||
132 kbd_read(I8042_DATA_REG) != KBD_ACK ||
133 kbd_read(I8042_DATA_REG) != KBD_POR)
136 if (kbd_write(I8042_DATA_REG, CMD_DRAIN_OUTPUT) ||
137 kbd_read(I8042_DATA_REG) != KBD_ACK)
140 /* set AT translation and disable irq */
141 config = kbd_cmd_read(CMD_RD_CONFIG);
145 /* Sometimes get a second byte */
146 else if ((quirk & QUIRK_DUP_POR) && config == KBD_POR)
147 config = kbd_cmd_read(CMD_RD_CONFIG);
149 config |= CONFIG_AT_TRANS;
150 config &= ~(CONFIG_KIRQ_EN | CONFIG_MIRQ_EN);
151 if (kbd_cmd_write(CMD_WR_CONFIG, config))
154 /* enable keyboard */
155 if (kbd_write(I8042_CMD_REG, CMD_KBD_EN) ||
161 debug("%s: Keyboard failure\n", __func__);
165 static int kbd_controller_present(void)
167 return in8(I8042_STS_REG) != 0xff;
171 * Implement a weak default function for boards that optionally
172 * need to skip the i8042 initialization.
174 * TODO(sjg@chromium.org): Use device tree for this?
176 int __weak board_i8042_skip(void)
178 /* As default, don't skip */
182 void i8042_flush(void)
187 * The delay is to give the keyboard controller some time
188 * to fill the next byte.
191 timeout = 100; /* wait for no longer than 100us */
192 while (timeout > 0 && !(in8(I8042_STS_REG) & STATUS_OBF)) {
197 /* Try to pull next byte if not timeout */
198 if (in8(I8042_STS_REG) & STATUS_OBF)
205 int i8042_disable(void)
207 if (kbd_input_empty() == 0)
210 /* Disable keyboard */
211 out8(I8042_CMD_REG, CMD_KBD_DIS);
213 if (kbd_input_empty() == 0)
219 static int i8042_kbd_check(struct input_config *input)
221 struct i8042_kbd_priv *priv = dev_get_priv(input->dev);
223 if ((in8(I8042_STS_REG) & STATUS_OBF) == 0) {
226 bool release = false;
230 scan_code = in8(I8042_DATA_REG);
231 if (scan_code == 0xfa) {
233 } else if (scan_code == 0xe0) {
234 priv->extended = true;
237 if (scan_code & 0x80) {
241 if (priv->extended) {
242 priv->extended = false;
243 for (i = 0; ext_key_map[i]; i++) {
244 if (ext_key_map[i] == scan_code) {
245 scan_code = 0x60 + i;
254 input_add_keycode(input, scan_code, release);
259 /* i8042_kbd_init - reset keyboard and init state flags */
260 static int i8042_start(struct udevice *dev)
262 struct keyboard_priv *uc_priv = dev_get_uclass_priv(dev);
263 struct i8042_kbd_priv *priv = dev_get_priv(dev);
264 struct input_config *input = &uc_priv->input;
269 if (!kbd_controller_present() || board_i8042_skip()) {
270 debug("i8042 keyboard controller is not present\n");
274 /* Init keyboard device (default US layout) */
276 penv = env_get("keymap");
278 if (strncmp(penv, "de", 3) == 0)
282 for (try = 0; kbd_reset(priv->quirks) != 0; try++) {
283 if (try >= KBD_RESET_TRIES)
287 ret = input_add_tables(input, keymap == KBD_GER);
291 i8042_kbd_update_leds(dev, NORMAL);
292 debug("%s: started\n", __func__);
298 * Set up the i8042 keyboard. This is called by the stdio device handler
300 * We want to do this init when the keyboard is actually used rather than
301 * at start-up, since keyboard input may not currently be selected.
303 * Once the keyboard starts there will be a period during which we must
304 * wait for the keyboard to init. We do this only when a key is first
305 * read - see kbd_wait_for_fifo_init().
307 * @return 0 if ok, -ve on error
309 static int i8042_kbd_probe(struct udevice *dev)
311 struct keyboard_priv *uc_priv = dev_get_uclass_priv(dev);
312 struct i8042_kbd_priv *priv = dev_get_priv(dev);
313 struct stdio_dev *sdev = &uc_priv->sdev;
314 struct input_config *input = &uc_priv->input;
317 if (fdtdec_get_bool(gd->fdt_blob, dev_of_offset(dev),
318 "intel,duplicate-por"))
319 priv->quirks |= QUIRK_DUP_POR;
321 /* Register the device. i8042_start() will be called soon */
323 input->read_keys = i8042_kbd_check;
324 input_allow_repeats(input, true);
325 strcpy(sdev->name, "i8042-kbd");
326 ret = input_stdio_register(sdev);
328 debug("%s: input_stdio_register() failed\n", __func__);
331 debug("%s: ready\n", __func__);
336 static const struct keyboard_ops i8042_kbd_ops = {
337 .start = i8042_start,
338 .update_leds = i8042_kbd_update_leds,
341 static const struct udevice_id i8042_kbd_ids[] = {
342 { .compatible = "intel,i8042-keyboard" },
346 U_BOOT_DRIVER(i8042_kbd) = {
348 .id = UCLASS_KEYBOARD,
349 .of_match = i8042_kbd_ids,
350 .probe = i8042_kbd_probe,
351 .ops = &i8042_kbd_ops,
352 .priv_auto_alloc_size = sizeof(struct i8042_kbd_priv),