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-rw-r--r--drivers/char/ec3104_keyb.c459
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diff --git a/drivers/char/ec3104_keyb.c b/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/config.h>
+
+#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);
+}
Copyright © 1996 – 2023 Jason A. Donenfeld. All Rights Reverse Engineered.