From 8c5188b6d350d033275eaf85faa12f284e2909e4 Mon Sep 17 00:00:00 2001 From: Benjamin LaHaise Date: Thu, 4 Nov 2010 10:29:13 -0700 Subject: [PATCH] Input: atkbd - add 'terminal' parameter for IBM Terminal keyboards MIME-Version: 1.0 Content-Type: text/plain; charset=utf8 Content-Transfer-Encoding: 8bit Many of the IBM Terminal keyboards from the 1980s and early 1990s communicate using a protocol similar, but not identical to the AT keyboard protocol. (Models known to be like this include 6110344, 6110668, 1390876, 1386887, and possibly others.) When the connector is rewired or adapter to an AT-DIN or PS/2 connector, they can be connected to a standard PC, with three caveats: a) They can only use scancode set 3; requests to use anything else are quietly ignored. b) The AT Command to request Make, Break and Repeat codes is not properly interpreted. c) The top function keys on a 122 key keyboard, and the arrow/edit keys in the middle of the board send non-standard scancodes. C) is easily taken care of in userspace, by use of setkeycodes B) can be taken care of by a userspace hack (that makes the kernel complain in dmesg) A) is fixable in theory, but on the keyboard i tested on (6110668), it seems to be detected unoverridably as Set 2, causing userspace oddities that make it harder to fix C). Enclosed is a small patch to the kernel that fixes A) and B) in the kernel, making it much easier to fix C) in userspace. It adds a single kernel command line parameter that overrides the detection that sets these boards as set 2, and instead of sending the Make-break-repeat command to the keyboard, it sends the make-break command, which is properly recognized by these keyboards. Software level key repeating seems to make up for the lack of hardware repeat codes perfectly. Without manually setting the command line parameter (tentatively named atkbd.terminal), this code has no effect, and the driver works exactly as before. See also: http://www.seasip.info/VintagePC/ibm_1390876.html http://www.seasip.info/VintagePC/ibm_6110344.html http://geekhack.org/showwiki.php?title=Island:7306 Signed-off-by: Erika Quinn Signed-off-by: Benjamin LaHaise Signed-off-by: Dmitry Torokhov --- drivers/input/keyboard/atkbd.c | 12 +++++++++++- 1 file changed, 11 insertions(+), 1 deletion(-) diff --git a/drivers/input/keyboard/atkbd.c b/drivers/input/keyboard/atkbd.c index d358ef8623f4..11478eb2c27d 100644 --- a/drivers/input/keyboard/atkbd.c +++ b/drivers/input/keyboard/atkbd.c @@ -63,6 +63,10 @@ static bool atkbd_extra; module_param_named(extra, atkbd_extra, bool, 0); MODULE_PARM_DESC(extra, "Enable extra LEDs and keys on IBM RapidAcces, EzKey and similar keyboards"); +static bool atkbd_terminal; +module_param_named(terminal, atkbd_terminal, bool, 0); +MODULE_PARM_DESC(terminal, "Enable break codes on an IBM Terminal keyboard connected via AT/PS2"); + /* * Scancode to keycode tables. These are just the default setting, and * are loadable via a userland utility. @@ -136,7 +140,8 @@ static const unsigned short atkbd_unxlate_table[128] = { #define ATKBD_CMD_ENABLE 0x00f4 #define ATKBD_CMD_RESET_DIS 0x00f5 /* Reset to defaults and disable */ #define ATKBD_CMD_RESET_DEF 0x00f6 /* Reset to defaults */ -#define ATKBD_CMD_SETALL_MBR 0x00fa +#define ATKBD_CMD_SETALL_MB 0x00f8 /* Set all keys to give break codes */ +#define ATKBD_CMD_SETALL_MBR 0x00fa /* ... and repeat */ #define ATKBD_CMD_RESET_BAT 0x02ff #define ATKBD_CMD_RESEND 0x00fe #define ATKBD_CMD_EX_ENABLE 0x10ea @@ -764,6 +769,11 @@ static int atkbd_select_set(struct atkbd *atkbd, int target_set, int allow_extra } } + if (atkbd_terminal) { + ps2_command(ps2dev, param, ATKBD_CMD_SETALL_MB); + return 3; + } + if (target_set != 3) return 2; -- 2.20.1