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linux/drivers/char/ec3104_keyb.c

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