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 */
19 DECLARE_GLOBAL_DATA_PTR;
23 #define out8(p, v) outb(v, p)
26 QUIRK_DUP_POR = 1 << 0,
30 struct i8042_kbd_priv {
31 bool extended; /* true if an extended keycode is expected next */
32 int quirks; /* quirks that we support */
35 static unsigned char ext_key_map[] = {
36 0x1c, /* keypad enter */
37 0x1d, /* right control */
38 0x35, /* keypad slash */
39 0x37, /* print screen */
42 0x47, /* editpad home */
43 0x48, /* editpad up */
44 0x49, /* editpad pgup */
45 0x4b, /* editpad left */
46 0x4d, /* editpad right */
47 0x4f, /* editpad end */
48 0x50, /* editpad dn */
49 0x51, /* editpad pgdn */
50 0x52, /* editpad ins */
51 0x53, /* editpad del */
55 static int kbd_input_empty(void)
57 int kbd_timeout = KBD_TIMEOUT * 1000;
59 while ((in8(I8042_STS_REG) & STATUS_IBF) && kbd_timeout--)
62 return kbd_timeout != -1;
65 static int kbd_output_full(void)
67 int kbd_timeout = KBD_TIMEOUT * 1000;
69 while (((in8(I8042_STS_REG) & STATUS_OBF) == 0) && kbd_timeout--)
72 return kbd_timeout != -1;
76 * check_leds() - Check the keyboard LEDs and update them it needed
78 * @ret: Value to return
79 * @return value of @ret
81 static int i8042_kbd_update_leds(struct udevice *dev, int leds)
84 out8(I8042_DATA_REG, CMD_SET_KBD_LED);
86 out8(I8042_DATA_REG, leds & 0x7);
91 static int kbd_write(int reg, int value)
93 if (!kbd_input_empty())
100 static int kbd_read(int reg)
102 if (!kbd_output_full())
108 static int kbd_cmd_read(int cmd)
110 if (kbd_write(I8042_CMD_REG, cmd))
113 return kbd_read(I8042_DATA_REG);
116 static int kbd_cmd_write(int cmd, int data)
118 if (kbd_write(I8042_CMD_REG, cmd))
121 return kbd_write(I8042_DATA_REG, data);
124 static int kbd_reset(int quirk)
128 /* controller self test */
129 if (kbd_cmd_read(CMD_SELF_TEST) != KBC_TEST_OK)
133 if (kbd_write(I8042_DATA_REG, CMD_RESET_KBD) ||
134 kbd_read(I8042_DATA_REG) != KBD_ACK ||
135 kbd_read(I8042_DATA_REG) != KBD_POR)
138 if (kbd_write(I8042_DATA_REG, CMD_DRAIN_OUTPUT) ||
139 kbd_read(I8042_DATA_REG) != KBD_ACK)
142 /* set AT translation and disable irq */
143 config = kbd_cmd_read(CMD_RD_CONFIG);
147 /* Sometimes get a second byte */
148 else if ((quirk & QUIRK_DUP_POR) && config == KBD_POR)
149 config = kbd_cmd_read(CMD_RD_CONFIG);
151 config |= CONFIG_AT_TRANS;
152 config &= ~(CONFIG_KIRQ_EN | CONFIG_MIRQ_EN);
153 if (kbd_cmd_write(CMD_WR_CONFIG, config))
156 /* enable keyboard */
157 if (kbd_write(I8042_CMD_REG, CMD_KBD_EN) ||
163 debug("%s: Keyboard failure\n", __func__);
167 static int kbd_controller_present(void)
169 return in8(I8042_STS_REG) != 0xff;
172 /** Flush all buffer from keyboard controller to host*/
173 static void i8042_flush(void)
178 * The delay is to give the keyboard controller some time
179 * to fill the next byte.
182 timeout = 100; /* wait for no longer than 100us */
183 while (timeout > 0 && !(in8(I8042_STS_REG) & STATUS_OBF)) {
188 /* Try to pull next byte if not timeout */
189 if (in8(I8042_STS_REG) & STATUS_OBF)
197 * Disables the keyboard so that key strokes no longer generate scancodes to
200 * @return 0 if ok, -1 if keyboard input was found while disabling
202 static 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()) {
267 debug("i8042 keyboard controller is not present\n");
271 /* Init keyboard device (default US layout) */
273 penv = env_get("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__);
294 static int i8042_kbd_remove(struct udevice *dev)
297 log_debug("i8042_disable() failed. fine, continue.\n");
304 * Set up the i8042 keyboard. This is called by the stdio device handler
306 * We want to do this init when the keyboard is actually used rather than
307 * at start-up, since keyboard input may not currently be selected.
309 * Once the keyboard starts there will be a period during which we must
310 * wait for the keyboard to init. We do this only when a key is first
311 * read - see kbd_wait_for_fifo_init().
313 * @return 0 if ok, -ve on error
315 static int i8042_kbd_probe(struct udevice *dev)
317 struct keyboard_priv *uc_priv = dev_get_uclass_priv(dev);
318 struct i8042_kbd_priv *priv = dev_get_priv(dev);
319 struct stdio_dev *sdev = &uc_priv->sdev;
320 struct input_config *input = &uc_priv->input;
323 if (fdtdec_get_bool(gd->fdt_blob, dev_of_offset(dev),
324 "intel,duplicate-por"))
325 priv->quirks |= QUIRK_DUP_POR;
327 /* Register the device. i8042_start() will be called soon */
329 input->read_keys = i8042_kbd_check;
330 input_allow_repeats(input, true);
331 strcpy(sdev->name, "i8042-kbd");
332 ret = input_stdio_register(sdev);
334 debug("%s: input_stdio_register() failed\n", __func__);
337 debug("%s: ready\n", __func__);
342 static const struct keyboard_ops i8042_kbd_ops = {
343 .start = i8042_start,
344 .update_leds = i8042_kbd_update_leds,
347 static const struct udevice_id i8042_kbd_ids[] = {
348 { .compatible = "intel,i8042-keyboard" },
352 U_BOOT_DRIVER(i8042_kbd) = {
354 .id = UCLASS_KEYBOARD,
355 .of_match = i8042_kbd_ids,
356 .probe = i8042_kbd_probe,
357 .remove = i8042_kbd_remove,
358 .ops = &i8042_kbd_ops,
359 .priv_auto_alloc_size = sizeof(struct i8042_kbd_priv),