458 lines
9.0 KiB
C
458 lines
9.0 KiB
C
/*
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* linux/drivers/char/ec3104_keyb.c
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*
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* Copyright (C) 2000 Philipp Rumpf <prumpf@tux.org>
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*
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* based on linux/drivers/char/pc_keyb.c, which had the following comments:
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*
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* Separation of the PC low-level part by Geert Uytterhoeven, May 1997
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* See keyboard.c for the whole history.
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*
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* Major cleanup by Martin Mares, May 1997
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*
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* Combined the keyboard and PS/2 mouse handling into one file,
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* because they share the same hardware.
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* Johan Myreen <jem@iki.fi> 1998-10-08.
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*
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* Code fixes to handle mouse ACKs properly.
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* C. Scott Ananian <cananian@alumni.princeton.edu> 1999-01-29.
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*/
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/* EC3104 note:
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* This code was written without any documentation about the EC3104 chip. While
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* I hope I got most of the basic functionality right, the register names I use
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* are most likely completely different from those in the chip documentation.
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*
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* If you have any further information about the EC3104, please tell me
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* (prumpf@tux.org).
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*/
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#include <linux/spinlock.h>
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#include <linux/sched.h>
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#include <linux/interrupt.h>
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#include <linux/tty.h>
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#include <linux/mm.h>
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#include <linux/signal.h>
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#include <linux/init.h>
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#include <linux/kbd_ll.h>
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#include <linux/delay.h>
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#include <linux/random.h>
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#include <linux/poll.h>
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#include <linux/miscdevice.h>
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#include <linux/slab.h>
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#include <linux/kbd_kern.h>
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#include <linux/bitops.h>
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#include <asm/keyboard.h>
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#include <asm/uaccess.h>
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#include <asm/irq.h>
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#include <asm/system.h>
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#include <asm/ec3104.h>
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#include <asm/io.h>
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/* Some configuration switches are present in the include file... */
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#include <linux/pc_keyb.h>
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#define MSR_CTS 0x10
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#define MCR_RTS 0x02
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#define LSR_DR 0x01
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#define LSR_BOTH_EMPTY 0x60
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static struct e5_struct {
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u8 packet[8];
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int pos;
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int length;
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u8 cached_mcr;
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u8 last_msr;
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} ec3104_keyb;
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/* Simple translation table for the SysRq keys */
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#ifdef CONFIG_MAGIC_SYSRQ
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unsigned char ec3104_kbd_sysrq_xlate[128] =
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"\000\0331234567890-=\177\t" /* 0x00 - 0x0f */
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"qwertyuiop[]\r\000as" /* 0x10 - 0x1f */
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"dfghjkl;'`\000\\zxcv" /* 0x20 - 0x2f */
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"bnm,./\000*\000 \000\201\202\203\204\205" /* 0x30 - 0x3f */
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"\206\207\210\211\212\000\000789-456+1" /* 0x40 - 0x4f */
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"230\177\000\000\213\214\000\000\000\000\000\000\000\000\000\000" /* 0x50 - 0x5f */
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"\r\000/"; /* 0x60 - 0x6f */
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#endif
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static void kbd_write_command_w(int data);
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static void kbd_write_output_w(int data);
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#ifdef CONFIG_PSMOUSE
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static void aux_write_ack(int val);
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static void __aux_write_ack(int val);
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#endif
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static DEFINE_SPINLOCK(kbd_controller_lock);
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static unsigned char handle_kbd_event(void);
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/* used only by send_data - set by keyboard_interrupt */
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static volatile unsigned char reply_expected;
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static volatile unsigned char acknowledge;
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static volatile unsigned char resend;
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int ec3104_kbd_setkeycode(unsigned int scancode, unsigned int keycode)
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{
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return 0;
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}
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int ec3104_kbd_getkeycode(unsigned int scancode)
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{
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return 0;
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}
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/* yes, it probably would be faster to use an array. I don't care. */
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static inline unsigned char ec3104_scan2key(unsigned char scancode)
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{
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switch (scancode) {
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case 1: /* '`' */
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return 41;
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case 2 ... 27:
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return scancode;
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case 28: /* '\\' */
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return 43;
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case 29 ... 39:
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return scancode + 1;
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case 40: /* '\r' */
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return 28;
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case 41 ... 50:
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return scancode + 3;
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case 51: /* ' ' */
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return 57;
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case 52: /* escape */
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return 1;
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case 54: /* insert/delete (labelled delete) */
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/* this should arguably be 110, but I'd like to have ctrl-alt-del
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* working with a standard keymap */
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return 111;
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case 55: /* left */
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return 105;
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case 56: /* home */
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return 102;
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case 57: /* end */
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return 107;
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case 58: /* up */
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return 103;
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case 59: /* down */
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return 108;
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case 60: /* pgup */
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return 104;
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case 61: /* pgdown */
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return 109;
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case 62: /* right */
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return 106;
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case 79 ... 88: /* f1 - f10 */
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return scancode - 20;
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case 89 ... 90: /* f11 - f12 */
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return scancode - 2;
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case 91: /* left shift */
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return 42;
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case 92: /* right shift */
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return 54;
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case 93: /* left alt */
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return 56;
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case 94: /* right alt */
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return 100;
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case 95: /* left ctrl */
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return 29;
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case 96: /* right ctrl */
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return 97;
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case 97: /* caps lock */
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return 58;
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case 102: /* left windows */
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return 125;
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case 103: /* right windows */
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return 126;
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case 106: /* Fn */
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/* this is wrong. */
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return 84;
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default:
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return 0;
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}
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}
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int ec3104_kbd_translate(unsigned char scancode, unsigned char *keycode,
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char raw_mode)
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{
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scancode &= 0x7f;
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*keycode = ec3104_scan2key(scancode);
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return 1;
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}
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char ec3104_kbd_unexpected_up(unsigned char keycode)
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{
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return 0200;
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}
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static inline void handle_keyboard_event(unsigned char scancode)
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{
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#ifdef CONFIG_VT
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handle_scancode(scancode, !(scancode & 0x80));
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#endif
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tasklet_schedule(&keyboard_tasklet);
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}
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void ec3104_kbd_leds(unsigned char leds)
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{
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}
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static u8 e5_checksum(u8 *packet, int count)
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{
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int i;
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u8 sum = 0;
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for (i=0; i<count; i++)
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sum ^= packet[i];
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if (sum & 0x80)
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sum ^= 0xc0;
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return sum;
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}
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static void e5_wait_for_cts(struct e5_struct *k)
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{
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u8 msr;
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do {
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msr = ctrl_inb(EC3104_SER4_MSR);
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} while (!(msr & MSR_CTS));
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}
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static void e5_send_byte(u8 byte, struct e5_struct *k)
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{
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u8 status;
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do {
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status = ctrl_inb(EC3104_SER4_LSR);
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} while ((status & LSR_BOTH_EMPTY) != LSR_BOTH_EMPTY);
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printk("<%02x>", byte);
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ctrl_outb(byte, EC3104_SER4_DATA);
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do {
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status = ctrl_inb(EC3104_SER4_LSR);
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} while ((status & LSR_BOTH_EMPTY) != LSR_BOTH_EMPTY);
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}
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static int e5_send_packet(u8 *packet, int count, struct e5_struct *k)
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{
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int i;
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disable_irq(EC3104_IRQ_SER4);
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if (k->cached_mcr & MCR_RTS) {
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printk("e5_send_packet: too slow\n");
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enable_irq(EC3104_IRQ_SER4);
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return -EAGAIN;
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}
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k->cached_mcr |= MCR_RTS;
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ctrl_outb(k->cached_mcr, EC3104_SER4_MCR);
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e5_wait_for_cts(k);
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printk("p: ");
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for(i=0; i<count; i++)
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e5_send_byte(packet[i], k);
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e5_send_byte(e5_checksum(packet, count), k);
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printk("\n");
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udelay(1500);
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k->cached_mcr &= ~MCR_RTS;
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ctrl_outb(k->cached_mcr, EC3104_SER4_MCR);
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set_current_state(TASK_UNINTERRUPTIBLE);
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enable_irq(EC3104_IRQ_SER4);
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return 0;
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}
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/*
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* E5 packets we know about:
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* E5->host 0x80 0x05 <checksum> - resend packet
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* host->E5 0x83 0x43 <contrast> - set LCD contrast
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* host->E5 0x85 0x41 0x02 <brightness> 0x02 - set LCD backlight
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* E5->host 0x87 <ps2 packet> 0x00 <checksum> - external PS2
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* E5->host 0x88 <scancode> <checksum> - key press
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*/
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static void e5_receive(struct e5_struct *k)
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{
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k->packet[k->pos++] = ctrl_inb(EC3104_SER4_DATA);
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if (k->pos == 1) {
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switch(k->packet[0]) {
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case 0x80:
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k->length = 3;
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break;
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case 0x87: /* PS2 ext */
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k->length = 6;
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break;
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case 0x88: /* keyboard */
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k->length = 3;
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break;
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default:
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k->length = 1;
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printk(KERN_WARNING "unknown E5 packet %02x\n",
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k->packet[0]);
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}
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}
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if (k->pos == k->length) {
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int i;
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if (e5_checksum(k->packet, k->length) != 0)
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printk(KERN_WARNING "E5: wrong checksum\n");
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#if 0
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printk("E5 packet [");
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for(i=0; i<k->length; i++) {
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printk("%02x ", k->packet[i]);
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}
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printk("(%02x)]\n", e5_checksum(k->packet, k->length-1));
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#endif
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switch(k->packet[0]) {
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case 0x80:
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case 0x88:
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handle_keyboard_event(k->packet[1]);
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break;
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}
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k->pos = k->length = 0;
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}
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}
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static void ec3104_keyb_interrupt(int irq, void *data)
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{
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struct e5_struct *k = &ec3104_keyb;
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u8 msr, lsr;
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msr = ctrl_inb(EC3104_SER4_MSR);
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if ((msr & MSR_CTS) && !(k->last_msr & MSR_CTS)) {
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if (k->cached_mcr & MCR_RTS)
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printk("confused: RTS already high\n");
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/* CTS went high. Send RTS. */
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k->cached_mcr |= MCR_RTS;
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ctrl_outb(k->cached_mcr, EC3104_SER4_MCR);
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} else if ((!(msr & MSR_CTS)) && (k->last_msr & MSR_CTS)) {
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/* CTS went low. */
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if (!(k->cached_mcr & MCR_RTS))
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printk("confused: RTS already low\n");
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k->cached_mcr &= ~MCR_RTS;
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ctrl_outb(k->cached_mcr, EC3104_SER4_MCR);
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}
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k->last_msr = msr;
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lsr = ctrl_inb(EC3104_SER4_LSR);
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if (lsr & LSR_DR)
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e5_receive(k);
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}
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static void ec3104_keyb_clear_state(void)
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{
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struct e5_struct *k = &ec3104_keyb;
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u8 msr, lsr;
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/* we want CTS to be low */
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k->last_msr = 0;
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for (;;) {
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msleep(100);
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msr = ctrl_inb(EC3104_SER4_MSR);
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lsr = ctrl_inb(EC3104_SER4_LSR);
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if (lsr & LSR_DR) {
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e5_receive(k);
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continue;
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}
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if ((msr & MSR_CTS) && !(k->last_msr & MSR_CTS)) {
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if (k->cached_mcr & MCR_RTS)
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printk("confused: RTS already high\n");
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/* CTS went high. Send RTS. */
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k->cached_mcr |= MCR_RTS;
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ctrl_outb(k->cached_mcr, EC3104_SER4_MCR);
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} else if ((!(msr & MSR_CTS)) && (k->last_msr & MSR_CTS)) {
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/* CTS went low. */
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if (!(k->cached_mcr & MCR_RTS))
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printk("confused: RTS already low\n");
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k->cached_mcr &= ~MCR_RTS;
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ctrl_outb(k->cached_mcr, EC3104_SER4_MCR);
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} else
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break;
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k->last_msr = msr;
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continue;
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}
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}
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void __init ec3104_kbd_init_hw(void)
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{
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ec3104_keyb.last_msr = ctrl_inb(EC3104_SER4_MSR);
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ec3104_keyb.cached_mcr = ctrl_inb(EC3104_SER4_MCR);
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ec3104_keyb_clear_state();
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/* Ok, finally allocate the IRQ, and off we go.. */
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request_irq(EC3104_IRQ_SER4, ec3104_keyb_interrupt, 0, "keyboard", NULL);
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}
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