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  1. /*
  2.  * Copyright (C) 2001-2004 Jakub Jermar
  3.  * All rights reserved.
  4.  *
  5.  * Redistribution and use in source and binary forms, with or without
  6.  * modification, are permitted provided that the following conditions
  7.  * are met:
  8.  *
  9.  * - Redistributions of source code must retain the above copyright
  10.  *   notice, this list of conditions and the following disclaimer.
  11.  * - Redistributions in binary form must reproduce the above copyright
  12.  *   notice, this list of conditions and the following disclaimer in the
  13.  *   documentation and/or other materials provided with the distribution.
  14.  * - The name of the author may not be used to endorse or promote products
  15.  *   derived from this software without specific prior written permission.
  16.  *
  17.  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
  18.  * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
  19.  * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
  20.  * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
  21.  * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
  22.  * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
  23.  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
  24.  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
  25.  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
  26.  * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  27.  */
  28.  
  29. #include <genarch/i8042/i8042.h>
  30. #include <arch/drivers/i8042.h>
  31. #include <arch/interrupt.h>
  32. #include <cpu.h>
  33. #include <arch/asm.h>
  34. #include <arch.h>
  35. #include <synch/spinlock.h>
  36. #include <typedefs.h>
  37. #include <console/chardev.h>
  38. #include <console/console.h>
  39. #include <macros.h>
  40. #include <interrupt.h>
  41.  
  42. /**
  43.  * i8042 processor driver.
  44.  * It takes care of low-level keyboard functions.
  45.  */
  46.  
  47. /** Keyboard commands. */
  48. #define KBD_ENABLE  0xf4
  49. #define KBD_DISABLE 0xf5
  50. #define KBD_ACK     0xfa
  51.  
  52. /*
  53.  * 60  Write 8042 Command Byte: next data byte written to port 60h is
  54.  *     placed in 8042 command register. Format:
  55.  *
  56.  *    |7|6|5|4|3|2|1|0|8042 Command Byte
  57.  *     | | | | | | | `---- 1=enable output register full interrupt
  58.  *     | | | | | | `----- should be 0
  59.  *     | | | | | `------ 1=set status register system, 0=clear
  60.  *     | | | | `------- 1=override keyboard inhibit, 0=allow inhibit
  61.  *     | | | `-------- disable keyboard I/O by driving clock line low
  62.  *     | | `--------- disable auxiliary device, drives clock line low
  63.  *     | `---------- IBM scancode translation 0=AT, 1=PC/XT
  64.  *     `----------- reserved, should be 0
  65.  */
  66.  
  67. #define i8042_SET_COMMAND   0x60
  68. #define i8042_COMMAND       0x49
  69.  
  70. #define i8042_BUFFER_FULL_MASK  0x01
  71. #define i8042_WAIT_MASK     0x02
  72.  
  73. #define SPECIAL     '?'
  74. #define KEY_RELEASE 0x80
  75.  
  76. /**
  77.  * These codes read from i8042 data register are silently ignored.
  78.  */
  79. #define IGNORE_CODE 0x7f
  80.  
  81. static void key_released(__u8 sc);
  82. static void key_pressed(__u8 sc);
  83. static char key_read(chardev_t *d);
  84.  
  85. #define PRESSED_SHIFT       (1<<0)
  86. #define PRESSED_CAPSLOCK    (1<<1)
  87. #define LOCKED_CAPSLOCK     (1<<0)
  88.  
  89. #define ACTIVE_READ_BUFF_SIZE 16    /* Must be power of 2 */
  90.  
  91. static __u8 active_read_buff[ACTIVE_READ_BUFF_SIZE];
  92.  
  93. SPINLOCK_INITIALIZE(keylock);       /**< keylock protects keyflags and lockflags. */
  94. static volatile int keyflags;       /**< Tracking of multiple keypresses. */
  95. static volatile int lockflags;      /**< Tracking of multiple keys lockings. */
  96.  
  97. static void i8042_suspend(chardev_t *);
  98. static void i8042_resume(chardev_t *);
  99.  
  100. static chardev_t kbrd;
  101. static chardev_operations_t ops = {
  102.     .suspend = i8042_suspend,
  103.     .resume = i8042_resume,
  104.     .read = key_read
  105. };
  106.  
  107. /** Primary meaning of scancodes. */
  108. static char sc_primary_map[] = {
  109.     SPECIAL, /* 0x00 */
  110.     SPECIAL, /* 0x01 - Esc */
  111.     '1', '2', '3', '4', '5', '6', '7', '8', '9', '0', '-', '=',
  112.     '\b', /* 0x0e - Backspace */
  113.     '\t', 'q', 'w', 'e', 'r', 't', 'y', 'u', 'i', 'o', 'p', '[', ']', '\n',
  114.     SPECIAL, /* 0x1d - LCtrl */
  115.     'a', 's', 'd', 'f', 'g', 'h', 'j', 'k', 'l', ';', '\'',
  116.     '`',
  117.     SPECIAL, /* 0x2a - LShift */
  118.     '\\',
  119.     'z', 'x', 'c', 'v', 'b', 'n', 'm', ',', '.', '/',
  120.     SPECIAL, /* 0x36 - RShift */
  121.     '*',
  122.     SPECIAL, /* 0x38 - LAlt */
  123.     ' ',
  124.     SPECIAL, /* 0x3a - CapsLock */
  125.     SPECIAL, /* 0x3b - F1 */
  126.     SPECIAL, /* 0x3c - F2 */
  127.     SPECIAL, /* 0x3d - F3 */
  128.     SPECIAL, /* 0x3e - F4 */
  129.     SPECIAL, /* 0x3f - F5 */
  130.     SPECIAL, /* 0x40 - F6 */
  131.     SPECIAL, /* 0x41 - F7 */
  132.     SPECIAL, /* 0x42 - F8 */
  133.     SPECIAL, /* 0x43 - F9 */
  134.     SPECIAL, /* 0x44 - F10 */
  135.     SPECIAL, /* 0x45 - NumLock */
  136.     SPECIAL, /* 0x46 - ScrollLock */
  137.     '7', '8', '9', '-',
  138.     '4', '5', '6', '+',
  139.     '1', '2', '3',
  140.     '0', '.',
  141.     SPECIAL, /* 0x54 - Alt-SysRq */
  142.     SPECIAL, /* 0x55 - F11/F12/PF1/FN */
  143.     SPECIAL, /* 0x56 - unlabelled key next to LAlt */
  144.     SPECIAL, /* 0x57 - F11 */
  145.     SPECIAL, /* 0x58 - F12 */
  146.     SPECIAL, /* 0x59 */
  147.     SPECIAL, /* 0x5a */
  148.     SPECIAL, /* 0x5b */
  149.     SPECIAL, /* 0x5c */
  150.     SPECIAL, /* 0x5d */
  151.     SPECIAL, /* 0x5e */
  152.     SPECIAL, /* 0x5f */
  153.     SPECIAL, /* 0x60 */
  154.     SPECIAL, /* 0x61 */
  155.     SPECIAL, /* 0x62 */
  156.     SPECIAL, /* 0x63 */
  157.     SPECIAL, /* 0x64 */
  158.     SPECIAL, /* 0x65 */
  159.     SPECIAL, /* 0x66 */
  160.     SPECIAL, /* 0x67 */
  161.     SPECIAL, /* 0x68 */
  162.     SPECIAL, /* 0x69 */
  163.     SPECIAL, /* 0x6a */
  164.     SPECIAL, /* 0x6b */
  165.     SPECIAL, /* 0x6c */
  166.     SPECIAL, /* 0x6d */
  167.     SPECIAL, /* 0x6e */
  168.     SPECIAL, /* 0x6f */
  169.     SPECIAL, /* 0x70 */
  170.     SPECIAL, /* 0x71 */
  171.     SPECIAL, /* 0x72 */
  172.     SPECIAL, /* 0x73 */
  173.     SPECIAL, /* 0x74 */
  174.     SPECIAL, /* 0x75 */
  175.     SPECIAL, /* 0x76 */
  176.     SPECIAL, /* 0x77 */
  177.     SPECIAL, /* 0x78 */
  178.     SPECIAL, /* 0x79 */
  179.     SPECIAL, /* 0x7a */
  180.     SPECIAL, /* 0x7b */
  181.     SPECIAL, /* 0x7c */
  182.     SPECIAL, /* 0x7d */
  183.     SPECIAL, /* 0x7e */
  184.     SPECIAL, /* 0x7f */
  185. };
  186.  
  187. /** Secondary meaning of scancodes. */
  188. static char sc_secondary_map[] = {
  189.     SPECIAL, /* 0x00 */
  190.     SPECIAL, /* 0x01 - Esc */
  191.     '!', '@', '#', '$', '%', '^', '&', '*', '(', ')', '_', '+',
  192.     SPECIAL, /* 0x0e - Backspace */
  193.     '\t', 'Q', 'W', 'E', 'R', 'T', 'Y', 'U', 'I', 'O', 'P', '{', '}', '\n',
  194.     SPECIAL, /* 0x1d - LCtrl */
  195.     'A', 'S', 'D', 'F', 'G', 'H', 'J', 'K', 'L', ':', '"',
  196.     '~',
  197.     SPECIAL, /* 0x2a - LShift */
  198.     '|',
  199.     'Z', 'X', 'C', 'V', 'B', 'N', 'M', '<', '>', '?',
  200.     SPECIAL, /* 0x36 - RShift */
  201.     '*',
  202.     SPECIAL, /* 0x38 - LAlt */
  203.     ' ',
  204.     SPECIAL, /* 0x3a - CapsLock */
  205.     SPECIAL, /* 0x3b - F1 */
  206.     SPECIAL, /* 0x3c - F2 */
  207.     SPECIAL, /* 0x3d - F3 */
  208.     SPECIAL, /* 0x3e - F4 */
  209.     SPECIAL, /* 0x3f - F5 */
  210.     SPECIAL, /* 0x40 - F6 */
  211.     SPECIAL, /* 0x41 - F7 */
  212.     SPECIAL, /* 0x42 - F8 */
  213.     SPECIAL, /* 0x43 - F9 */
  214.     SPECIAL, /* 0x44 - F10 */
  215.     SPECIAL, /* 0x45 - NumLock */
  216.     SPECIAL, /* 0x46 - ScrollLock */
  217.     '7', '8', '9', '-',
  218.     '4', '5', '6', '+',
  219.     '1', '2', '3',
  220.     '0', '.',
  221.     SPECIAL, /* 0x54 - Alt-SysRq */
  222.     SPECIAL, /* 0x55 - F11/F12/PF1/FN */
  223.     SPECIAL, /* 0x56 - unlabelled key next to LAlt */
  224.     SPECIAL, /* 0x57 - F11 */
  225.     SPECIAL, /* 0x58 - F12 */
  226.     SPECIAL, /* 0x59 */
  227.     SPECIAL, /* 0x5a */
  228.     SPECIAL, /* 0x5b */
  229.     SPECIAL, /* 0x5c */
  230.     SPECIAL, /* 0x5d */
  231.     SPECIAL, /* 0x5e */
  232.     SPECIAL, /* 0x5f */
  233.     SPECIAL, /* 0x60 */
  234.     SPECIAL, /* 0x61 */
  235.     SPECIAL, /* 0x62 */
  236.     SPECIAL, /* 0x63 */
  237.     SPECIAL, /* 0x64 */
  238.     SPECIAL, /* 0x65 */
  239.     SPECIAL, /* 0x66 */
  240.     SPECIAL, /* 0x67 */
  241.     SPECIAL, /* 0x68 */
  242.     SPECIAL, /* 0x69 */
  243.     SPECIAL, /* 0x6a */
  244.     SPECIAL, /* 0x6b */
  245.     SPECIAL, /* 0x6c */
  246.     SPECIAL, /* 0x6d */
  247.     SPECIAL, /* 0x6e */
  248.     SPECIAL, /* 0x6f */
  249.     SPECIAL, /* 0x70 */
  250.     SPECIAL, /* 0x71 */
  251.     SPECIAL, /* 0x72 */
  252.     SPECIAL, /* 0x73 */
  253.     SPECIAL, /* 0x74 */
  254.     SPECIAL, /* 0x75 */
  255.     SPECIAL, /* 0x76 */
  256.     SPECIAL, /* 0x77 */
  257.     SPECIAL, /* 0x78 */
  258.     SPECIAL, /* 0x79 */
  259.     SPECIAL, /* 0x7a */
  260.     SPECIAL, /* 0x7b */
  261.     SPECIAL, /* 0x7c */
  262.     SPECIAL, /* 0x7d */
  263.     SPECIAL, /* 0x7e */
  264.     SPECIAL, /* 0x7f */
  265. };
  266.  
  267. static void i8042_interrupt(int n, istate_t *istate);
  268. static void i8042_wait(void);
  269.  
  270. /** Initialize i8042. */
  271. void i8042_init(void)
  272. {
  273.     int i;
  274.  
  275.     exc_register(VECTOR_KBD, "i8042_interrupt", (iroutine) i8042_interrupt);
  276.     i8042_wait();
  277.     i8042_command_write(i8042_SET_COMMAND);
  278.     i8042_wait();
  279.     i8042_data_write(i8042_COMMAND);
  280.     i8042_wait();
  281.  
  282.     trap_virtual_enable_irqs(1<<IRQ_KBD);
  283.     chardev_initialize("i8042_kbd", &kbrd, &ops);
  284.     stdin = &kbrd;
  285.  
  286.     /*
  287.      * Clear input buffer.
  288.      * Number of iterations is limited to prevent infinite looping.
  289.      */
  290.     for (i = 0; (i8042_status_read() & i8042_BUFFER_FULL_MASK) && i < 100; i++) {
  291.         i8042_data_read();
  292.     }  
  293. }
  294.  
  295. /** Process i8042 interrupt.
  296.  *
  297.  * @param n Interrupt vector.
  298.  * @param stack Interrupted stack.
  299.  */
  300. void i8042_interrupt(int n, istate_t *istate)
  301. {
  302.     __u8 x;
  303.  
  304.     trap_virtual_eoi();
  305.     x = i8042_data_read();
  306.     if (x & KEY_RELEASE)
  307.         key_released(x ^ KEY_RELEASE);
  308.     else
  309.         key_pressed(x);
  310. }
  311.  
  312. /** Wait until the controller reads its data. */
  313. void i8042_wait(void) {
  314.     while (i8042_status_read() & i8042_WAIT_MASK) {
  315.         /* wait */
  316.     }
  317. }
  318.  
  319. /** Process release of key.
  320.  *
  321.  * @param sc Scancode of the key being released.
  322.  */
  323. void key_released(__u8 sc)
  324. {
  325.     spinlock_lock(&keylock);
  326.     switch (sc) {
  327.         case SC_LSHIFT:
  328.         case SC_RSHIFT:
  329.         keyflags &= ~PRESSED_SHIFT;
  330.         break;
  331.         case SC_CAPSLOCK:
  332.         keyflags &= ~PRESSED_CAPSLOCK;
  333.         if (lockflags & LOCKED_CAPSLOCK)
  334.             lockflags &= ~LOCKED_CAPSLOCK;
  335.         else
  336.             lockflags |= LOCKED_CAPSLOCK;
  337.         break;
  338.         default:
  339.         break;
  340.     }
  341.     spinlock_unlock(&keylock);
  342. }
  343.  
  344. /** Process keypress.
  345.  *
  346.  * @param sc Scancode of the key being pressed.
  347.  */
  348. void key_pressed(__u8 sc)
  349. {
  350.     char *map = sc_primary_map;
  351.     char ascii = sc_primary_map[sc];
  352.     bool shift, capslock;
  353.     bool letter = false;
  354.  
  355.     spinlock_lock(&keylock);
  356.     switch (sc) {
  357.     case SC_LSHIFT:
  358.     case SC_RSHIFT:
  359.             keyflags |= PRESSED_SHIFT;
  360.         break;
  361.     case SC_CAPSLOCK:
  362.         keyflags |= PRESSED_CAPSLOCK;
  363.         break;
  364.     case SC_SPEC_ESCAPE:
  365.         break;
  366.     case SC_LEFTARR:
  367.         chardev_push_character(&kbrd, 0x1b);
  368.         chardev_push_character(&kbrd, 0x5b);
  369.         chardev_push_character(&kbrd, 0x44);
  370.         break;
  371.     case SC_RIGHTARR:
  372.         chardev_push_character(&kbrd, 0x1b);
  373.         chardev_push_character(&kbrd, 0x5b);
  374.         chardev_push_character(&kbrd, 0x43);
  375.         break;
  376.     case SC_UPARR:
  377.         chardev_push_character(&kbrd, 0x1b);
  378.         chardev_push_character(&kbrd, 0x5b);
  379.         chardev_push_character(&kbrd, 0x41);
  380.         break;
  381.     case SC_DOWNARR:
  382.         chardev_push_character(&kbrd, 0x1b);
  383.         chardev_push_character(&kbrd, 0x5b);
  384.         chardev_push_character(&kbrd, 0x42);
  385.         break;
  386.     case SC_HOME:
  387.         chardev_push_character(&kbrd, 0x1b);
  388.         chardev_push_character(&kbrd, 0x4f);
  389.         chardev_push_character(&kbrd, 0x48);
  390.         break;
  391.     case SC_END:
  392.         chardev_push_character(&kbrd, 0x1b);
  393.         chardev_push_character(&kbrd, 0x4f);
  394.         chardev_push_character(&kbrd, 0x46);
  395.         break;
  396.     case SC_DELETE:
  397.         chardev_push_character(&kbrd, 0x1b);
  398.         chardev_push_character(&kbrd, 0x5b);
  399.         chardev_push_character(&kbrd, 0x33);
  400.         chardev_push_character(&kbrd, 0x7e);
  401.         break;
  402.     default:
  403.             letter = is_lower(ascii);
  404.         capslock = (keyflags & PRESSED_CAPSLOCK) || (lockflags & LOCKED_CAPSLOCK);
  405.         shift = keyflags & PRESSED_SHIFT;
  406.         if (letter && capslock)
  407.             shift = !shift;
  408.         if (shift)
  409.             map = sc_secondary_map;
  410.         chardev_push_character(&kbrd, map[sc]);
  411.         break;
  412.     }
  413.     spinlock_unlock(&keylock);
  414. }
  415.  
  416. /* Called from getc(). */
  417. void i8042_resume(chardev_t *d)
  418. {
  419. }
  420.  
  421. /* Called from getc(). */
  422. void i8042_suspend(chardev_t *d)
  423. {
  424. }
  425.  
  426. static __u8 active_read_buff_read(void)
  427. {
  428.     static int i=0;
  429.     i &= (ACTIVE_READ_BUFF_SIZE-1);
  430.     if(!active_read_buff[i]) {
  431.         return 0;
  432.     }
  433.     return active_read_buff[i++];
  434. }
  435.  
  436. static void active_read_buff_write(__u8 ch)
  437. {
  438.     static int i=0;
  439.     active_read_buff[i] = ch;
  440.     i++;
  441.     i &= (ACTIVE_READ_BUFF_SIZE-1);
  442.     active_read_buff[i]=0;
  443. }
  444.  
  445.  
  446. static void active_read_key_pressed(__u8 sc)
  447. {
  448.     char *map = sc_primary_map;
  449.     char ascii = sc_primary_map[sc];
  450.     bool shift, capslock;
  451.     bool letter = false;
  452.  
  453.     /*spinlock_lock(&keylock);*/
  454.     switch (sc) {
  455.     case SC_LSHIFT:
  456.     case SC_RSHIFT:
  457.             keyflags |= PRESSED_SHIFT;
  458.         break;
  459.     case SC_CAPSLOCK:
  460.         keyflags |= PRESSED_CAPSLOCK;
  461.         break;
  462.     case SC_SPEC_ESCAPE:
  463.         break;
  464.     case SC_LEFTARR:
  465.         active_read_buff_write(0x1b);
  466.         active_read_buff_write(0x5b);
  467.         active_read_buff_write(0x44);
  468.         break;
  469.     case SC_RIGHTARR:
  470.         active_read_buff_write(0x1b);
  471.         active_read_buff_write(0x5b);
  472.         active_read_buff_write(0x43);
  473.         break;
  474.     case SC_UPARR:
  475.         active_read_buff_write(0x1b);
  476.         active_read_buff_write(0x5b);
  477.         active_read_buff_write(0x41);
  478.         break;
  479.     case SC_DOWNARR:
  480.         active_read_buff_write(0x1b);
  481.         active_read_buff_write(0x5b);
  482.         active_read_buff_write(0x42);
  483.         break;
  484.     case SC_HOME:
  485.         active_read_buff_write(0x1b);
  486.         active_read_buff_write(0x4f);
  487.         active_read_buff_write(0x48);
  488.         break;
  489.     case SC_END:
  490.         active_read_buff_write(0x1b);
  491.         active_read_buff_write(0x4f);
  492.         active_read_buff_write(0x46);
  493.         break;
  494.     case SC_DELETE:
  495.         active_read_buff_write(0x1b);
  496.         active_read_buff_write(0x5b);
  497.         active_read_buff_write(0x33);
  498.         active_read_buff_write(0x7e);
  499.         break;
  500.     default:
  501.             letter = is_lower(ascii);
  502.         capslock = (keyflags & PRESSED_CAPSLOCK) || (lockflags & LOCKED_CAPSLOCK);
  503.         shift = keyflags & PRESSED_SHIFT;
  504.         if (letter && capslock)
  505.             shift = !shift;
  506.         if (shift)
  507.             map = sc_secondary_map;
  508.         active_read_buff_write(map[sc]);
  509.         break;
  510.     }
  511.     /*spinlock_unlock(&keylock);*/
  512.  
  513. }
  514.  
  515. static char key_read(chardev_t *d)
  516. {
  517.     char ch;   
  518.  
  519.     while(!(ch = active_read_buff_read())) {
  520.         __u8 x;
  521.         while (!((x=i8042_status_read() & i8042_BUFFER_FULL_MASK)))
  522.             ;
  523.         x = i8042_data_read();
  524.         if (x != IGNORE_CODE) {
  525.             if (x & KEY_RELEASE)
  526.                 key_released(x ^ KEY_RELEASE);
  527.             else
  528.                 active_read_key_pressed(x);
  529.         }
  530.     }
  531.     return ch;
  532. }
  533.  
  534. /** Poll for key press and release events.
  535.  *
  536.  * This function can be used to implement keyboard polling.
  537.  */
  538. void i8042_poll(void)
  539. {
  540.     __u8 x;
  541.  
  542.     while (((x = i8042_status_read() & i8042_BUFFER_FULL_MASK))) {
  543.         x = i8042_data_read();
  544.         if (x != IGNORE_CODE) {
  545.             if (x & KEY_RELEASE)
  546.                 key_released(x ^ KEY_RELEASE);
  547.             else
  548.                 key_pressed(x);
  549.         }
  550.     }
  551. }
  552.