Hi Ralf,
This patch fixes the arrow keys (and all other keys that generate E0/E1
scancode prefixes on AT keyboards) by adding support for E0/E1 scancode
prefixes to the dummy keyboard driver if CONFIG_INPUT=y.
Rationale: When using the new input layer (i.e. with a USB keyboard or a custom
input device), the input layer relies on kbd_translate() in the low-level
keyboard driver to convert from AT-style scancodes to keycodes. If you don't
have a PS/2 keyboard interface and don't compile in the PS/2 keyboard driver,
you have to enable the dummy keyboard driver, which naively assumes that
keycodes and scancodes are interchangeable. This is correct if you do not have
a keyboard, but fails for prefixed scancodes if you do have a keyboard which
uses the new input layer.
--- linux-mips-2.4.x/drivers/char/dummy_keyb.c Tue Apr 1 16:33:31 2003
+++ linux/drivers/char/dummy_keyb.c Wed Apr 30 08:12:19 2003
@@ -23,9 +23,12 @@
* CONFIG_VT.
*
*/
+
+#include <linux/config.h>
#include <linux/sched.h>
#include <linux/errno.h>
#include <linux/init.h>
+#include <linux/input.h>
void kbd_leds(unsigned char leds)
{
@@ -41,6 +44,84 @@
return scancode;
}
+#ifdef CONFIG_INPUT
+static unsigned char e0_keys[128] = {
+ 0, 0, 0, KEY_KPCOMMA, 0, KEY_INTL3, 0, 0, /* 0x00-0x07 */
+ 0, 0, 0, 0, KEY_LANG1, KEY_LANG2, 0, 0, /* 0x08-0x0f */
+ 0, 0, 0, 0, 0, 0, 0, 0, /* 0x10-0x17 */
+ 0, 0, 0, 0, KEY_KPENTER, KEY_RIGHTCTRL, KEY_VOLUMEUP, 0,/* 0x18-0x1f */
+ 0, 0, 0, 0, 0, KEY_VOLUMEDOWN, KEY_MUTE, 0, /* 0x20-0x27 */
+ 0, 0, 0, 0, 0, 0, 0, 0, /* 0x28-0x2f */
+ 0, 0, 0, 0, 0, KEY_KPSLASH, 0, KEY_SYSRQ, /* 0x30-0x37 */
+ KEY_RIGHTALT, KEY_BRIGHTNESSUP, KEY_BRIGHTNESSDOWN,
+ KEY_EJECTCD, 0, 0, 0, 0, /* 0x38-0x3f */
+ 0, 0, 0, 0, 0, 0, 0, KEY_HOME, /* 0x40-0x47 */
+ KEY_UP, KEY_PAGEUP, 0, KEY_LEFT, 0, KEY_RIGHT, 0, KEY_END, /* 0x48-0x4f */
+ KEY_DOWN, KEY_PAGEDOWN, KEY_INSERT, KEY_DELETE, 0, 0, 0, 0, /* 0x50-0x57 */
+ 0, 0, 0, KEY_LEFTMETA, KEY_RIGHTMETA, KEY_COMPOSE, KEY_POWER, 0, /* 0x58-0x5f */
+ 0, 0, 0, 0, 0, 0, 0, 0, /* 0x60-0x67 */
+ 0, 0, 0, 0, 0, 0, 0, KEY_MACRO, /* 0x68-0x6f */
+ 0, 0, 0, 0, 0, 0, 0, 0, /* 0x70-0x77 */
+ 0, 0, 0, 0, 0, 0, 0, 0 /* 0x78-0x7f */
+};
+
+int kbd_translate(unsigned char scancode, unsigned char *keycode,
+ char raw_mode)
+{
+ /* This code was copied from char/pc_keyb.c and will be
+ * superflous when the input layer is fully integrated.
+ * We don't need the high_keys handling, so this part
+ * has been removed.
+ */
+ static int prev_scancode = 0;
+
+ /* special prefix scancodes.. */
+ if (scancode == 0xe0 || scancode == 0xe1) {
+ prev_scancode = scancode;
+ return 0;
+ }
+
+ scancode &= 0x7f;
+
+ if (prev_scancode) {
+ if (prev_scancode != 0xe0) {
+ if (prev_scancode == 0xe1 && scancode == 0x1d) {
+ prev_scancode = 0x100;
+ return 0;
+ } else if (prev_scancode == 0x100 && scancode == 0x45) {
+ *keycode = KEY_PAUSE;
+ prev_scancode = 0;
+ } else {
+ if (!raw_mode)
+ printk(KERN_INFO "keyboard: unknown e1 escape sequence\n");
+ prev_scancode = 0;
+ return 0;
+ }
+ } else {
+ prev_scancode = 0;
+ if (scancode == 0x2a || scancode == 0x36)
+ return 0;
+ }
+ if (e0_keys[scancode])
+ *keycode = e0_keys[scancode];
+ else {
+ if (!raw_mode)
+ printk(KERN_INFO "keyboard: unknown scancode e0 %02x\n",
+ scancode);
+ return 0;
+ }
+ } else {
+ switch (scancode) {
+ case 91: scancode = KEY_LINEFEED; break;
+ case 92: scancode = KEY_KPEQUAL; break;
+ case 125: scancode = KEY_INTL1; break;
+ }
+ *keycode = scancode;
+ }
+ return 1;
+}
+
+#else
int kbd_translate(unsigned char scancode, unsigned char *keycode,
char raw_mode)
{
@@ -48,6 +129,7 @@
return 1;
}
+#endif
char kbd_unexpected_up(unsigned char keycode)
{
Gr{oetje,eeting}s,
Geert
--
Geert Uytterhoeven -- There's lots of Linux beyond ia32 -- geert@linux-m68k.org
In personal conversations with technical people, I call myself a hacker. But
when I'm talking to journalists I just say "programmer" or something like that.
-- Linus Torvalds
