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drivers/input/i8042.c
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d41ce506b Initial Release, ... |
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/* * (C) Copyright 2002 ELTEC Elektronik AG * Frank Gottschling <fgottschling@eltec.de> * * SPDX-License-Identifier: GPL-2.0+ */ /* i8042.c - Intel 8042 keyboard driver routines */ #include <common.h> #include <dm.h> #include <errno.h> #include <i8042.h> #include <input.h> #include <keyboard.h> #include <asm/io.h> DECLARE_GLOBAL_DATA_PTR; /* defines */ #define in8(p) inb(p) #define out8(p, v) outb(v, p) enum { QUIRK_DUP_POR = 1 << 0, }; /* 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 */ }; 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 ", __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) { 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; if (!kbd_controller_present() || board_i8042_skip()) { debug("i8042 keyboard controller is not present "); return -ENOENT; } /* Init keyboard device (default US layout) */ keymap = KBD_US; penv = env_get("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 ", __func__); return 0; } /** * 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 */ static int i8042_kbd_probe(struct udevice *dev) { 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 ", __func__); return ret; } debug("%s: ready ", __func__); return 0; } 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), }; |