/* * Copyright (c) 2001-2004 Jakub Jermar * All rights reserved. * * Redistribution and use in source and binary forms, with or without * modification, are permitted provided that the following conditions * are met: * * - Redistributions of source code must retain the above copyright * notice, this list of conditions and the following disclaimer. * - Redistributions in binary form must reproduce the above copyright * notice, this list of conditions and the following disclaimer in the * documentation and/or other materials provided with the distribution. * - The name of the author may not be used to endorse or promote products * derived from this software without specific prior written permission. * * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. */ /** @addtogroup genarch * @{ */ /** * @file * @brief i8042 processor driver. * * It takes care of low-level keyboard functions. */ #include #ifdef ia64 #include #endif #include #include #include #include #include #include #include #include #include #include #include #include /* Keyboard commands. */ #define KBD_ENABLE 0xf4 #define KBD_DISABLE 0xf5 #define KBD_ACK 0xfa /* * 60 Write 8042 Command Byte: next data byte written to port 60h is * placed in 8042 command register. Format: * * |7|6|5|4|3|2|1|0|8042 Command Byte * | | | | | | | `---- 1=enable output register full interrupt * | | | | | | `----- should be 0 * | | | | | `------ 1=set status register system, 0=clear * | | | | `------- 1=override keyboard inhibit, 0=allow inhibit * | | | `-------- disable keyboard I/O by driving clock line low * | | `--------- disable auxiliary device, drives clock line low * | `---------- IBM scancode translation 0=AT, 1=PC/XT * `----------- reserved, should be 0 */ #define i8042_SET_COMMAND 0x60 #define i8042_COMMAND 0x69 #define i8042_BUFFER_FULL_MASK 0x01 #define i8042_WAIT_MASK 0x02 #define i8042_MOUSE_DATA 0x20 static void i8042_suspend(chardev_t *); static void i8042_resume(chardev_t *); static chardev_operations_t ops = { .suspend = i8042_suspend, .resume = i8042_resume, .read = i8042_key_read }; /** Structure for i8042's IRQ. */ static irq_t i8042_kbd_irq; static irq_t i8042_mouse_irq; void i8042_grab(void) { ipl_t ipl = interrupts_disable(); spinlock_lock(&i8042_kbd_irq.lock); i8042_kbd_irq.notif_cfg.notify = false; spinlock_unlock(&i8042_kbd_irq.lock); spinlock_lock(&i8042_mouse_irq.lock); i8042_mouse_irq.notif_cfg.notify = false; spinlock_unlock(&i8042_mouse_irq.lock); interrupts_restore(ipl); } void i8042_release(void) { ipl_t ipl = interrupts_disable(); spinlock_lock(&i8042_kbd_irq.lock); if (i8042_kbd_irq.notif_cfg.answerbox) i8042_kbd_irq.notif_cfg.notify = true; spinlock_unlock(&i8042_kbd_irq.lock); spinlock_lock(&i8042_mouse_irq.lock); if (i8042_mouse_irq.notif_cfg.answerbox) i8042_mouse_irq.notif_cfg.notify = true; spinlock_unlock(&i8042_mouse_irq.lock); interrupts_restore(ipl); } static irq_ownership_t i8042_claim(void) { return IRQ_ACCEPT; } static void i8042_irq_handler(irq_t *irq, void *arg, ...) { if (irq->notif_cfg.notify && irq->notif_cfg.answerbox) ipc_irq_send_notif(irq); else { uint8_t data; uint8_t status; while (((status = i8042_status_read()) & i8042_BUFFER_FULL_MASK)) { data = i8042_data_read(); if ((status & i8042_MOUSE_DATA)) continue; if (data & KEY_RELEASE) key_released(data ^ KEY_RELEASE); else key_pressed(data); } } } /** Initialize i8042. */ void i8042_init(devno_t kbd_devno, inr_t kbd_inr, devno_t mouse_devno, inr_t mouse_inr) { chardev_initialize("i8042_kbd", &kbrd, &ops); stdin = &kbrd; irq_initialize(&i8042_kbd_irq); i8042_kbd_irq.devno = kbd_devno; i8042_kbd_irq.inr = kbd_inr; i8042_kbd_irq.claim = i8042_claim; i8042_kbd_irq.handler = i8042_irq_handler; irq_register(&i8042_kbd_irq); irq_initialize(&i8042_mouse_irq); i8042_mouse_irq.devno = mouse_devno; i8042_mouse_irq.inr = mouse_inr; i8042_mouse_irq.claim = i8042_claim; i8042_mouse_irq.handler = i8042_irq_handler; irq_register(&i8042_mouse_irq); #ifndef ia64 trap_virtual_enable_irqs(1 << kbd_inr); trap_virtual_enable_irqs(1 << mouse_inr); #endif /* * Clear input buffer. * Number of iterations is limited to prevent infinite looping. */ int i; for (i = 0; (i8042_status_read() & i8042_BUFFER_FULL_MASK) && i < 100; i++) { i8042_data_read(); } sysinfo_set_item_val("kbd", NULL, true); sysinfo_set_item_val("kbd.devno", NULL, kbd_devno); sysinfo_set_item_val("kbd.inr", NULL, kbd_inr); #ifdef KBD_LEGACY sysinfo_set_item_val("kbd.type", NULL, KBD_LEGACY); #endif sysinfo_set_item_val("mouse", NULL, true); sysinfo_set_item_val("mouse.devno", NULL, mouse_devno); sysinfo_set_item_val("mouse.inr", NULL, mouse_inr); i8042_grab(); } /* Called from getc(). */ void i8042_resume(chardev_t *d) { } /* Called from getc(). */ void i8042_suspend(chardev_t *d) { } char i8042_key_read(chardev_t *d) { char ch; while(!(ch = active_read_buff_read())) { uint8_t x; while (!(i8042_status_read() & i8042_BUFFER_FULL_MASK)) ; x = i8042_data_read(); if (x & KEY_RELEASE) key_released(x ^ KEY_RELEASE); else active_read_key_pressed(x); } return ch; } /** Poll for key press and release events. * * This function can be used to implement keyboard polling. */ void i8042_poll(void) { uint8_t x; while (((x = i8042_status_read() & i8042_BUFFER_FULL_MASK))) { x = i8042_data_read(); if (x & KEY_RELEASE) key_released(x ^ KEY_RELEASE); else key_pressed(x); } } /** @} */