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linux/drivers/input/keyboard/atkbd.c
David Howells 7d12e780e0 IRQ: Maintain regs pointer globally rather than passing to IRQ handlers 
Maintain a per-CPU global "struct pt_regs *" variable which can be used instead
of passing regs around manually through all ~1800 interrupt handlers in the
Linux kernel.

The regs pointer is used in few places, but it potentially costs both stack
space and code to pass it around.  On the FRV arch, removing the regs parameter
from all the genirq function results in a 20% speed up of the IRQ exit path
(ie: from leaving timer_interrupt() to leaving do_IRQ()).

Where appropriate, an arch may override the generic storage facility and do
something different with the variable.  On FRV, for instance, the address is
maintained in GR28 at all times inside the kernel as part of general exception
handling.

Having looked over the code, it appears that the parameter may be handed down
through up to twenty or so layers of functions.  Consider a USB character
device attached to a USB hub, attached to a USB controller that posts its
interrupts through a cascaded auxiliary interrupt controller.  A character
device driver may want to pass regs to the sysrq handler through the input
layer which adds another few layers of parameter passing.

I've build this code with allyesconfig for x86_64 and i386.  I've runtested the
main part of the code on FRV and i386, though I can't test most of the drivers.
I've also done partial conversion for powerpc and MIPS - these at least compile
with minimal configurations.

This will affect all archs.  Mostly the changes should be relatively easy.
Take do_IRQ(), store the regs pointer at the beginning, saving the old one:

	struct pt_regs *old_regs = set_irq_regs(regs);

And put the old one back at the end:

	set_irq_regs(old_regs);

Don't pass regs through to generic_handle_irq() or __do_IRQ().

In timer_interrupt(), this sort of change will be necessary:

	-	update_process_times(user_mode(regs));
	-	profile_tick(CPU_PROFILING, regs);
	+	update_process_times(user_mode(get_irq_regs()));
	+	profile_tick(CPU_PROFILING);

I'd like to move update_process_times()'s use of get_irq_regs() into itself,
except that i386, alone of the archs, uses something other than user_mode().

Some notes on the interrupt handling in the drivers:

 (*) input_dev() is now gone entirely.  The regs pointer is no longer stored in
     the input_dev struct.

 (*) finish_unlinks() in drivers/usb/host/ohci-q.c needs checking.  It does
     something different depending on whether it's been supplied with a regs
     pointer or not.

 (*) Various IRQ handler function pointers have been moved to type
     irq_handler_t.

Signed-Off-By: David Howells <dhowells@redhat.com>
(cherry picked from 1b16e7ac850969f38b375e511e3fa2f474a33867 commit)
2006-10-05 15:10:12 +01:00

1276 lines
32 KiB
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/*
* AT and PS/2 keyboard driver
*
* Copyright (c) 1999-2002 Vojtech Pavlik
*/
/*
* This program is free software; you can redistribute it and/or modify it
* under the terms of the GNU General Public License version 2 as published by
* the Free Software Foundation.
*/
/*
* This driver can handle standard AT keyboards and PS/2 keyboards in
* Translated and Raw Set 2 and Set 3, as well as AT keyboards on dumb
* input-only controllers and AT keyboards connected over a one way RS232
* converter.
*/
#include <linux/delay.h>
#include <linux/module.h>
#include <linux/moduleparam.h>
#include <linux/slab.h>
#include <linux/interrupt.h>
#include <linux/init.h>
#include <linux/input.h>
#include <linux/serio.h>
#include <linux/workqueue.h>
#include <linux/libps2.h>
#include <linux/mutex.h>
#define DRIVER_DESC "AT and PS/2 keyboard driver"
MODULE_AUTHOR("Vojtech Pavlik <vojtech@suse.cz>");
MODULE_DESCRIPTION(DRIVER_DESC);
MODULE_LICENSE("GPL");
static int atkbd_set = 2;
module_param_named(set, atkbd_set, int, 0);
MODULE_PARM_DESC(set, "Select keyboard code set (2 = default, 3 = PS/2 native)");
#if defined(__i386__) || defined(__x86_64__) || defined(__hppa__)
static int atkbd_reset;
#else
static int atkbd_reset = 1;
#endif
module_param_named(reset, atkbd_reset, bool, 0);
MODULE_PARM_DESC(reset, "Reset keyboard during initialization");
static int atkbd_softrepeat;
module_param_named(softrepeat, atkbd_softrepeat, bool, 0);
MODULE_PARM_DESC(softrepeat, "Use software keyboard repeat");
static int atkbd_softraw = 1;
module_param_named(softraw, atkbd_softraw, bool, 0);
MODULE_PARM_DESC(softraw, "Use software generated rawmode");
static int atkbd_scroll;
module_param_named(scroll, atkbd_scroll, bool, 0);
MODULE_PARM_DESC(scroll, "Enable scroll-wheel on MS Office and similar keyboards");
static int 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");
__obsolete_setup("atkbd_set=");
__obsolete_setup("atkbd_reset");
__obsolete_setup("atkbd_softrepeat=");
/*
* Scancode to keycode tables. These are just the default setting, and
* are loadable via an userland utility.
*/
static unsigned char atkbd_set2_keycode[512] = {
#ifdef CONFIG_KEYBOARD_ATKBD_HP_KEYCODES
/* XXX: need a more general approach */
#include "hpps2atkbd.h" /* include the keyboard scancodes */
#else
0, 67, 65, 63, 61, 59, 60, 88, 0, 68, 66, 64, 62, 15, 41,117,
0, 56, 42, 93, 29, 16, 2, 0, 0, 0, 44, 31, 30, 17, 3, 0,
0, 46, 45, 32, 18, 5, 4, 95, 0, 57, 47, 33, 20, 19, 6,183,
0, 49, 48, 35, 34, 21, 7,184, 0, 0, 50, 36, 22, 8, 9,185,
0, 51, 37, 23, 24, 11, 10, 0, 0, 52, 53, 38, 39, 25, 12, 0,
0, 89, 40, 0, 26, 13, 0, 0, 58, 54, 28, 27, 0, 43, 0, 85,
0, 86, 91, 90, 92, 0, 14, 94, 0, 79,124, 75, 71,121, 0, 0,
82, 83, 80, 76, 77, 72, 1, 69, 87, 78, 81, 74, 55, 73, 70, 99,
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
217,100,255, 0, 97,165, 0, 0,156, 0, 0, 0, 0, 0, 0,125,
173,114, 0,113, 0, 0, 0,126,128, 0, 0,140, 0, 0, 0,127,
159, 0,115, 0,164, 0, 0,116,158, 0,150,166, 0, 0, 0,142,
157, 0, 0, 0, 0, 0, 0, 0,155, 0, 98, 0, 0,163, 0, 0,
226, 0, 0, 0, 0, 0, 0, 0, 0,255, 96, 0, 0, 0,143, 0,
0, 0, 0, 0, 0, 0, 0, 0, 0,107, 0,105,102, 0, 0,112,
110,111,108,112,106,103, 0,119, 0,118,109, 0, 99,104,119, 0,
0, 0, 0, 65, 99,
#endif
};
static unsigned char atkbd_set3_keycode[512] = {
0, 0, 0, 0, 0, 0, 0, 59, 1,138,128,129,130, 15, 41, 60,
131, 29, 42, 86, 58, 16, 2, 61,133, 56, 44, 31, 30, 17, 3, 62,
134, 46, 45, 32, 18, 5, 4, 63,135, 57, 47, 33, 20, 19, 6, 64,
136, 49, 48, 35, 34, 21, 7, 65,137,100, 50, 36, 22, 8, 9, 66,
125, 51, 37, 23, 24, 11, 10, 67,126, 52, 53, 38, 39, 25, 12, 68,
113,114, 40, 43, 26, 13, 87, 99, 97, 54, 28, 27, 43, 43, 88, 70,
108,105,119,103,111,107, 14,110, 0, 79,106, 75, 71,109,102,104,
82, 83, 80, 76, 77, 72, 69, 98, 0, 96, 81, 0, 78, 73, 55,183,
184,185,186,187, 74, 94, 92, 93, 0, 0, 0,125,126,127,112, 0,
0,139,150,163,165,115,152,150,166,140,160,154,113,114,167,168,
148,149,147,140
};
static unsigned char atkbd_unxlate_table[128] = {
0,118, 22, 30, 38, 37, 46, 54, 61, 62, 70, 69, 78, 85,102, 13,
21, 29, 36, 45, 44, 53, 60, 67, 68, 77, 84, 91, 90, 20, 28, 27,
35, 43, 52, 51, 59, 66, 75, 76, 82, 14, 18, 93, 26, 34, 33, 42,
50, 49, 58, 65, 73, 74, 89,124, 17, 41, 88, 5, 6, 4, 12, 3,
11, 2, 10, 1, 9,119,126,108,117,125,123,107,115,116,121,105,
114,122,112,113,127, 96, 97,120, 7, 15, 23, 31, 39, 47, 55, 63,
71, 79, 86, 94, 8, 16, 24, 32, 40, 48, 56, 64, 72, 80, 87,111,
19, 25, 57, 81, 83, 92, 95, 98, 99,100,101,103,104,106,109,110
};
#define ATKBD_CMD_SETLEDS 0x10ed
#define ATKBD_CMD_GSCANSET 0x11f0
#define ATKBD_CMD_SSCANSET 0x10f0
#define ATKBD_CMD_GETID 0x02f2
#define ATKBD_CMD_SETREP 0x10f3
#define ATKBD_CMD_ENABLE 0x00f4
#define ATKBD_CMD_RESET_DIS 0x00f5
#define ATKBD_CMD_SETALL_MBR 0x00fa
#define ATKBD_CMD_RESET_BAT 0x02ff
#define ATKBD_CMD_RESEND 0x00fe
#define ATKBD_CMD_EX_ENABLE 0x10ea
#define ATKBD_CMD_EX_SETLEDS 0x20eb
#define ATKBD_CMD_OK_GETID 0x02e8
#define ATKBD_RET_ACK 0xfa
#define ATKBD_RET_NAK 0xfe
#define ATKBD_RET_BAT 0xaa
#define ATKBD_RET_EMUL0 0xe0
#define ATKBD_RET_EMUL1 0xe1
#define ATKBD_RET_RELEASE 0xf0
#define ATKBD_RET_HANJA 0xf1
#define ATKBD_RET_HANGEUL 0xf2
#define ATKBD_RET_ERR 0xff
#define ATKBD_KEY_UNKNOWN 0
#define ATKBD_KEY_NULL 255
#define ATKBD_SCR_1 254
#define ATKBD_SCR_2 253
#define ATKBD_SCR_4 252
#define ATKBD_SCR_8 251
#define ATKBD_SCR_CLICK 250
#define ATKBD_SCR_LEFT 249
#define ATKBD_SCR_RIGHT 248
#define ATKBD_SPECIAL 248
#define ATKBD_LED_EVENT_BIT 0
#define ATKBD_REP_EVENT_BIT 1
#define ATKBD_XL_ERR 0x01
#define ATKBD_XL_BAT 0x02
#define ATKBD_XL_ACK 0x04
#define ATKBD_XL_NAK 0x08
#define ATKBD_XL_HANGEUL 0x10
#define ATKBD_XL_HANJA 0x20
static struct {
unsigned char keycode;
unsigned char set2;
} atkbd_scroll_keys[] = {
{ ATKBD_SCR_1, 0xc5 },
{ ATKBD_SCR_2, 0x9d },
{ ATKBD_SCR_4, 0xa4 },
{ ATKBD_SCR_8, 0x9b },
{ ATKBD_SCR_CLICK, 0xe0 },
{ ATKBD_SCR_LEFT, 0xcb },
{ ATKBD_SCR_RIGHT, 0xd2 },
};
/*
* The atkbd control structure
*/
struct atkbd {
struct ps2dev ps2dev;
struct input_dev *dev;
/* Written only during init */
char name[64];
char phys[32];
unsigned short id;
unsigned char keycode[512];
unsigned char set;
unsigned char translated;
unsigned char extra;
unsigned char write;
unsigned char softrepeat;
unsigned char softraw;
unsigned char scroll;
unsigned char enabled;
/* Accessed only from interrupt */
unsigned char emul;
unsigned char resend;
unsigned char release;
unsigned long xl_bit;
unsigned int last;
unsigned long time;
struct work_struct event_work;
struct mutex event_mutex;
unsigned long event_mask;
};
static ssize_t atkbd_attr_show_helper(struct device *dev, char *buf,
ssize_t (*handler)(struct atkbd *, char *));
static ssize_t atkbd_attr_set_helper(struct device *dev, const char *buf, size_t count,
ssize_t (*handler)(struct atkbd *, const char *, size_t));
#define ATKBD_DEFINE_ATTR(_name) \
static ssize_t atkbd_show_##_name(struct atkbd *, char *); \
static ssize_t atkbd_set_##_name(struct atkbd *, const char *, size_t); \
static ssize_t atkbd_do_show_##_name(struct device *d, struct device_attribute *attr, char *b) \
{ \
return atkbd_attr_show_helper(d, b, atkbd_show_##_name); \
} \
static ssize_t atkbd_do_set_##_name(struct device *d, struct device_attribute *attr, const char *b, size_t s) \
{ \
return atkbd_attr_set_helper(d, b, s, atkbd_set_##_name); \
} \
static struct device_attribute atkbd_attr_##_name = \
__ATTR(_name, S_IWUSR | S_IRUGO, atkbd_do_show_##_name, atkbd_do_set_##_name);
ATKBD_DEFINE_ATTR(extra);
ATKBD_DEFINE_ATTR(scroll);
ATKBD_DEFINE_ATTR(set);
ATKBD_DEFINE_ATTR(softrepeat);
ATKBD_DEFINE_ATTR(softraw);
static const unsigned int xl_table[] = {
ATKBD_RET_BAT, ATKBD_RET_ERR, ATKBD_RET_ACK,
ATKBD_RET_NAK, ATKBD_RET_HANJA, ATKBD_RET_HANGEUL,
};
/*
* Checks if we should mangle the scancode to extract 'release' bit
* in translated mode.
*/
static int atkbd_need_xlate(unsigned long xl_bit, unsigned char code)
{
int i;
if (code == ATKBD_RET_EMUL0 || code == ATKBD_RET_EMUL1)
return 0;
for (i = 0; i < ARRAY_SIZE(xl_table); i++)
if (code == xl_table[i])
return test_bit(i, &xl_bit);
return 1;
}
/*
* Calculates new value of xl_bit so the driver can distinguish
* between make/break pair of scancodes for select keys and PS/2
* protocol responses.
*/
static void atkbd_calculate_xl_bit(struct atkbd *atkbd, unsigned char code)
{
int i;
for (i = 0; i < ARRAY_SIZE(xl_table); i++) {
if (!((code ^ xl_table[i]) & 0x7f)) {
if (code & 0x80)
__clear_bit(i, &atkbd->xl_bit);
else
__set_bit(i, &atkbd->xl_bit);
break;
}
}
}
/*
* Encode the scancode, 0xe0 prefix, and high bit into a single integer,
* keeping kernel 2.4 compatibility for set 2
*/
static unsigned int atkbd_compat_scancode(struct atkbd *atkbd, unsigned int code)
{
if (atkbd->set == 3) {
if (atkbd->emul == 1)
code |= 0x100;
} else {
code = (code & 0x7f) | ((code & 0x80) << 1);
if (atkbd->emul == 1)
code |= 0x80;
}
return code;
}
/*
* atkbd_interrupt(). Here takes place processing of data received from
* the keyboard into events.
*/
static irqreturn_t atkbd_interrupt(struct serio *serio, unsigned char data,
unsigned int flags)
{
struct atkbd *atkbd = serio_get_drvdata(serio);
struct input_dev *dev = atkbd->dev;
unsigned int code = data;
int scroll = 0, hscroll = 0, click = -1, add_release_event = 0;
int value;
unsigned char keycode;
#ifdef ATKBD_DEBUG
printk(KERN_DEBUG "atkbd.c: Received %02x flags %02x\n", data, flags);
#endif
#if !defined(__i386__) && !defined (__x86_64__)
if ((flags & (SERIO_FRAME | SERIO_PARITY)) && (~flags & SERIO_TIMEOUT) && !atkbd->resend && atkbd->write) {
printk(KERN_WARNING "atkbd.c: frame/parity error: %02x\n", flags);
serio_write(serio, ATKBD_CMD_RESEND);
atkbd->resend = 1;
goto out;
}
if (!flags && data == ATKBD_RET_ACK)
atkbd->resend = 0;
#endif
if (unlikely(atkbd->ps2dev.flags & PS2_FLAG_ACK))
if (ps2_handle_ack(&atkbd->ps2dev, data))
goto out;
if (unlikely(atkbd->ps2dev.flags & PS2_FLAG_CMD))
if (ps2_handle_response(&atkbd->ps2dev, data))
goto out;
if (!atkbd->enabled)
goto out;
input_event(dev, EV_MSC, MSC_RAW, code);
if (atkbd->translated) {
if (atkbd->emul || atkbd_need_xlate(atkbd->xl_bit, code)) {
atkbd->release = code >> 7;
code &= 0x7f;
}
if (!atkbd->emul)
atkbd_calculate_xl_bit(atkbd, data);
}
switch (code) {
case ATKBD_RET_BAT:
atkbd->enabled = 0;
serio_reconnect(atkbd->ps2dev.serio);
goto out;
case ATKBD_RET_EMUL0:
atkbd->emul = 1;
goto out;
case ATKBD_RET_EMUL1:
atkbd->emul = 2;
goto out;
case ATKBD_RET_RELEASE:
atkbd->release = 1;
goto out;
case ATKBD_RET_ACK:
case ATKBD_RET_NAK:
printk(KERN_WARNING "atkbd.c: Spurious %s on %s. "
"Some program might be trying access hardware directly.\n",
data == ATKBD_RET_ACK ? "ACK" : "NAK", serio->phys);
goto out;
case ATKBD_RET_HANGEUL:
case ATKBD_RET_HANJA:
/*
* These keys do not report release and thus need to be
* flagged properly
*/
add_release_event = 1;
break;
case ATKBD_RET_ERR:
printk(KERN_DEBUG "atkbd.c: Keyboard on %s reports too many keys pressed.\n", serio->phys);
goto out;
}
code = atkbd_compat_scancode(atkbd, code);
if (atkbd->emul && --atkbd->emul)
goto out;
keycode = atkbd->keycode[code];
if (keycode != ATKBD_KEY_NULL)
input_event(dev, EV_MSC, MSC_SCAN, code);
switch (keycode) {
case ATKBD_KEY_NULL:
break;
case ATKBD_KEY_UNKNOWN:
printk(KERN_WARNING
"atkbd.c: Unknown key %s (%s set %d, code %#x on %s).\n",
atkbd->release ? "released" : "pressed",
atkbd->translated ? "translated" : "raw",
atkbd->set, code, serio->phys);
printk(KERN_WARNING
"atkbd.c: Use 'setkeycodes %s%02x <keycode>' to make it known.\n",
code & 0x80 ? "e0" : "", code & 0x7f);
input_sync(dev);
break;
case ATKBD_SCR_1:
scroll = 1 - atkbd->release * 2;
break;
case ATKBD_SCR_2:
scroll = 2 - atkbd->release * 4;
break;
case ATKBD_SCR_4:
scroll = 4 - atkbd->release * 8;
break;
case ATKBD_SCR_8:
scroll = 8 - atkbd->release * 16;
break;
case ATKBD_SCR_CLICK:
click = !atkbd->release;
break;
case ATKBD_SCR_LEFT:
hscroll = -1;
break;
case ATKBD_SCR_RIGHT:
hscroll = 1;
break;
default:
if (atkbd->release) {
value = 0;
atkbd->last = 0;
} else if (!atkbd->softrepeat && test_bit(keycode, dev->key)) {
/* Workaround Toshiba laptop multiple keypress */
value = time_before(jiffies, atkbd->time) && atkbd->last == code ? 1 : 2;
} else {
value = 1;
atkbd->last = code;
atkbd->time = jiffies + msecs_to_jiffies(dev->rep[REP_DELAY]) / 2;
}
input_event(dev, EV_KEY, keycode, value);
input_sync(dev);
if (value && add_release_event) {
input_report_key(dev, keycode, 0);
input_sync(dev);
}
}
if (atkbd->scroll) {
if (click != -1)
input_report_key(dev, BTN_MIDDLE, click);
input_report_rel(dev, REL_WHEEL, scroll);
input_report_rel(dev, REL_HWHEEL, hscroll);
input_sync(dev);
}
atkbd->release = 0;
out:
return IRQ_HANDLED;
}
static int atkbd_set_repeat_rate(struct atkbd *atkbd)
{
const short period[32] =
{ 33, 37, 42, 46, 50, 54, 58, 63, 67, 75, 83, 92, 100, 109, 116, 125,
133, 149, 167, 182, 200, 217, 232, 250, 270, 303, 333, 370, 400, 435, 470, 500 };
const short delay[4] =
{ 250, 500, 750, 1000 };
struct input_dev *dev = atkbd->dev;
unsigned char param;
int i = 0, j = 0;
while (i < ARRAY_SIZE(period) - 1 && period[i] < dev->rep[REP_PERIOD])
i++;
dev->rep[REP_PERIOD] = period[i];
while (j < ARRAY_SIZE(delay) - 1 && delay[j] < dev->rep[REP_DELAY])
j++;
dev->rep[REP_DELAY] = delay[j];
param = i | (j << 5);
return ps2_command(&atkbd->ps2dev, &param, ATKBD_CMD_SETREP);
}
static int atkbd_set_leds(struct atkbd *atkbd)
{
struct input_dev *dev = atkbd->dev;
unsigned char param[2];
param[0] = (test_bit(LED_SCROLLL, dev->led) ? 1 : 0)
| (test_bit(LED_NUML, dev->led) ? 2 : 0)
| (test_bit(LED_CAPSL, dev->led) ? 4 : 0);
if (ps2_command(&atkbd->ps2dev, param, ATKBD_CMD_SETLEDS))
return -1;
if (atkbd->extra) {
param[0] = 0;
param[1] = (test_bit(LED_COMPOSE, dev->led) ? 0x01 : 0)
| (test_bit(LED_SLEEP, dev->led) ? 0x02 : 0)
| (test_bit(LED_SUSPEND, dev->led) ? 0x04 : 0)
| (test_bit(LED_MISC, dev->led) ? 0x10 : 0)
| (test_bit(LED_MUTE, dev->led) ? 0x20 : 0);
if (ps2_command(&atkbd->ps2dev, param, ATKBD_CMD_EX_SETLEDS))
return -1;
}
return 0;
}
/*
* atkbd_event_work() is used to complete processing of events that
* can not be processed by input_event() which is often called from
* interrupt context.
*/
static void atkbd_event_work(void *data)
{
struct atkbd *atkbd = data;
mutex_lock(&atkbd->event_mutex);
if (test_and_clear_bit(ATKBD_LED_EVENT_BIT, &atkbd->event_mask))
atkbd_set_leds(atkbd);
if (test_and_clear_bit(ATKBD_REP_EVENT_BIT, &atkbd->event_mask))
atkbd_set_repeat_rate(atkbd);
mutex_unlock(&atkbd->event_mutex);
}
/*
* Event callback from the input module. Events that change the state of
* the hardware are processed here. If action can not be performed in
* interrupt context it is offloaded to atkbd_event_work.
*/
static int atkbd_event(struct input_dev *dev, unsigned int type, unsigned int code, int value)
{
struct atkbd *atkbd = dev->private;
if (!atkbd->write)
return -1;
switch (type) {
case EV_LED:
set_bit(ATKBD_LED_EVENT_BIT, &atkbd->event_mask);
wmb();
schedule_work(&atkbd->event_work);
return 0;
case EV_REP:
if (!atkbd->softrepeat) {
set_bit(ATKBD_REP_EVENT_BIT, &atkbd->event_mask);
wmb();
schedule_work(&atkbd->event_work);
}
return 0;
}
return -1;
}
/*
* atkbd_enable() signals that interrupt handler is allowed to
* generate input events.
*/
static inline void atkbd_enable(struct atkbd *atkbd)
{
serio_pause_rx(atkbd->ps2dev.serio);
atkbd->enabled = 1;
serio_continue_rx(atkbd->ps2dev.serio);
}
/*
* atkbd_disable() tells input handler that all incoming data except
* for ACKs and command response should be dropped.
*/
static inline void atkbd_disable(struct atkbd *atkbd)
{
serio_pause_rx(atkbd->ps2dev.serio);
atkbd->enabled = 0;
serio_continue_rx(atkbd->ps2dev.serio);
}
/*
* atkbd_probe() probes for an AT keyboard on a serio port.
*/
static int atkbd_probe(struct atkbd *atkbd)
{
struct ps2dev *ps2dev = &atkbd->ps2dev;
unsigned char param[2];
/*
* Some systems, where the bit-twiddling when testing the io-lines of the
* controller may confuse the keyboard need a full reset of the keyboard. On
* these systems the BIOS also usually doesn't do it for us.
*/
if (atkbd_reset)
if (ps2_command(ps2dev, NULL, ATKBD_CMD_RESET_BAT))
printk(KERN_WARNING "atkbd.c: keyboard reset failed on %s\n", ps2dev->serio->phys);
/*
* Then we check the keyboard ID. We should get 0xab83 under normal conditions.
* Some keyboards report different values, but the first byte is always 0xab or
* 0xac. Some old AT keyboards don't report anything. If a mouse is connected, this
* should make sure we don't try to set the LEDs on it.
*/
param[0] = param[1] = 0xa5; /* initialize with invalid values */
if (ps2_command(ps2dev, param, ATKBD_CMD_GETID)) {
/*
* If the get ID command failed, we check if we can at least set the LEDs on
* the keyboard. This should work on every keyboard out there. It also turns
* the LEDs off, which we want anyway.
*/
param[0] = 0;
if (ps2_command(ps2dev, param, ATKBD_CMD_SETLEDS))
return -1;
atkbd->id = 0xabba;
return 0;
}
if (!ps2_is_keyboard_id(param[0]))
return -1;
atkbd->id = (param[0] << 8) | param[1];
if (atkbd->id == 0xaca1 && atkbd->translated) {
printk(KERN_ERR "atkbd.c: NCD terminal keyboards are only supported on non-translating\n");
printk(KERN_ERR "atkbd.c: controllers. Use i8042.direct=1 to disable translation.\n");
return -1;
}
return 0;
}
/*
* atkbd_select_set checks if a keyboard has a working Set 3 support, and
* sets it into that. Unfortunately there are keyboards that can be switched
* to Set 3, but don't work well in that (BTC Multimedia ...)
*/
static int atkbd_select_set(struct atkbd *atkbd, int target_set, int allow_extra)
{
struct ps2dev *ps2dev = &atkbd->ps2dev;
unsigned char param[2];
atkbd->extra = 0;
/*
* For known special keyboards we can go ahead and set the correct set.
* We check for NCD PS/2 Sun, NorthGate OmniKey 101 and
* IBM RapidAccess / IBM EzButton / Chicony KBP-8993 keyboards.
*/
if (atkbd->translated)
return 2;
if (atkbd->id == 0xaca1) {
param[0] = 3;
ps2_command(ps2dev, param, ATKBD_CMD_SSCANSET);
return 3;
}
if (allow_extra) {
param[0] = 0x71;
if (!ps2_command(ps2dev, param, ATKBD_CMD_EX_ENABLE)) {
atkbd->extra = 1;
return 2;
}
}
if (target_set != 3)
return 2;
if (!ps2_command(ps2dev, param, ATKBD_CMD_OK_GETID)) {
atkbd->id = param[0] << 8 | param[1];
return 2;
}
param[0] = 3;
if (ps2_command(ps2dev, param, ATKBD_CMD_SSCANSET))
return 2;
param[0] = 0;
if (ps2_command(ps2dev, param, ATKBD_CMD_GSCANSET))
return 2;
if (param[0] != 3) {
param[0] = 2;
if (ps2_command(ps2dev, param, ATKBD_CMD_SSCANSET))
return 2;
}
ps2_command(ps2dev, param, ATKBD_CMD_SETALL_MBR);
return 3;
}
static int atkbd_activate(struct atkbd *atkbd)
{
struct ps2dev *ps2dev = &atkbd->ps2dev;
unsigned char param[1];
/*
* Set the LEDs to a defined state.
*/
param[0] = 0;
if (ps2_command(ps2dev, param, ATKBD_CMD_SETLEDS))
return -1;
/*
* Set autorepeat to fastest possible.
*/
param[0] = 0;
if (ps2_command(ps2dev, param, ATKBD_CMD_SETREP))
return -1;
/*
* Enable the keyboard to receive keystrokes.
*/
if (ps2_command(ps2dev, NULL, ATKBD_CMD_ENABLE)) {
printk(KERN_ERR "atkbd.c: Failed to enable keyboard on %s\n",
ps2dev->serio->phys);
return -1;
}
return 0;
}
/*
* atkbd_cleanup() restores the keyboard state so that BIOS is happy after a
* reboot.
*/
static void atkbd_cleanup(struct serio *serio)
{
struct atkbd *atkbd = serio_get_drvdata(serio);
ps2_command(&atkbd->ps2dev, NULL, ATKBD_CMD_RESET_BAT);
}
/*
* atkbd_disconnect() closes and frees.
*/
static void atkbd_disconnect(struct serio *serio)
{
struct atkbd *atkbd = serio_get_drvdata(serio);
atkbd_disable(atkbd);
/* make sure we don't have a command in flight */
synchronize_sched(); /* Allow atkbd_interrupt()s to complete. */
flush_scheduled_work();
device_remove_file(&serio->dev, &atkbd_attr_extra);
device_remove_file(&serio->dev, &atkbd_attr_scroll);
device_remove_file(&serio->dev, &atkbd_attr_set);
device_remove_file(&serio->dev, &atkbd_attr_softrepeat);
device_remove_file(&serio->dev, &atkbd_attr_softraw);
input_unregister_device(atkbd->dev);
serio_close(serio);
serio_set_drvdata(serio, NULL);
kfree(atkbd);
}
/*
* atkbd_set_keycode_table() initializes keyboard's keycode table
* according to the selected scancode set
*/
static void atkbd_set_keycode_table(struct atkbd *atkbd)
{
int i, j;
memset(atkbd->keycode, 0, sizeof(atkbd->keycode));
if (atkbd->translated) {
for (i = 0; i < 128; i++) {
atkbd->keycode[i] = atkbd_set2_keycode[atkbd_unxlate_table[i]];
atkbd->keycode[i | 0x80] = atkbd_set2_keycode[atkbd_unxlate_table[i] | 0x80];
if (atkbd->scroll)
for (j = 0; j < ARRAY_SIZE(atkbd_scroll_keys); j++)
if ((atkbd_unxlate_table[i] | 0x80) == atkbd_scroll_keys[j].set2)
atkbd->keycode[i | 0x80] = atkbd_scroll_keys[j].keycode;
}
} else if (atkbd->set == 3) {
memcpy(atkbd->keycode, atkbd_set3_keycode, sizeof(atkbd->keycode));
} else {
memcpy(atkbd->keycode, atkbd_set2_keycode, sizeof(atkbd->keycode));
if (atkbd->scroll)
for (i = 0; i < ARRAY_SIZE(atkbd_scroll_keys); i++)
atkbd->keycode[atkbd_scroll_keys[i].set2] = atkbd_scroll_keys[i].keycode;
}
atkbd->keycode[atkbd_compat_scancode(atkbd, ATKBD_RET_HANGEUL)] = KEY_HANGUEL;
atkbd->keycode[atkbd_compat_scancode(atkbd, ATKBD_RET_HANJA)] = KEY_HANJA;
}
/*
* atkbd_set_device_attrs() sets up keyboard's input device structure
*/
static void atkbd_set_device_attrs(struct atkbd *atkbd)
{
struct input_dev *input_dev = atkbd->dev;
int i;
if (atkbd->extra)
snprintf(atkbd->name, sizeof(atkbd->name),
"AT Set 2 Extra keyboard");
else
snprintf(atkbd->name, sizeof(atkbd->name),
"AT %s Set %d keyboard",
atkbd->translated ? "Translated" : "Raw", atkbd->set);
snprintf(atkbd->phys, sizeof(atkbd->phys),
"%s/input0", atkbd->ps2dev.serio->phys);
input_dev->name = atkbd->name;
input_dev->phys = atkbd->phys;
input_dev->id.bustype = BUS_I8042;
input_dev->id.vendor = 0x0001;
input_dev->id.product = atkbd->translated ? 1 : atkbd->set;
input_dev->id.version = atkbd->id;
input_dev->event = atkbd_event;
input_dev->private = atkbd;
input_dev->cdev.dev = &atkbd->ps2dev.serio->dev;
input_dev->evbit[0] = BIT(EV_KEY) | BIT(EV_REP) | BIT(EV_MSC);
if (atkbd->write) {
input_dev->evbit[0] |= BIT(EV_LED);
input_dev->ledbit[0] = BIT(LED_NUML) | BIT(LED_CAPSL) | BIT(LED_SCROLLL);
}
if (atkbd->extra)
input_dev->ledbit[0] |= BIT(LED_COMPOSE) | BIT(LED_SUSPEND) |
BIT(LED_SLEEP) | BIT(LED_MUTE) | BIT(LED_MISC);
if (!atkbd->softrepeat) {
input_dev->rep[REP_DELAY] = 250;
input_dev->rep[REP_PERIOD] = 33;
}
input_dev->mscbit[0] = atkbd->softraw ? BIT(MSC_SCAN) : BIT(MSC_RAW) | BIT(MSC_SCAN);
if (atkbd->scroll) {
input_dev->evbit[0] |= BIT(EV_REL);
input_dev->relbit[0] = BIT(REL_WHEEL) | BIT(REL_HWHEEL);
set_bit(BTN_MIDDLE, input_dev->keybit);
}
input_dev->keycode = atkbd->keycode;
input_dev->keycodesize = sizeof(unsigned char);
input_dev->keycodemax = ARRAY_SIZE(atkbd_set2_keycode);
for (i = 0; i < 512; i++)
if (atkbd->keycode[i] && atkbd->keycode[i] < ATKBD_SPECIAL)
set_bit(atkbd->keycode[i], input_dev->keybit);
}
/*
* atkbd_connect() is called when the serio module finds an interface
* that isn't handled yet by an appropriate device driver. We check if
* there is an AT keyboard out there and if yes, we register ourselves
* to the input module.
*/
static int atkbd_connect(struct serio *serio, struct serio_driver *drv)
{
struct atkbd *atkbd;
struct input_dev *dev;
int err = -ENOMEM;
atkbd = kzalloc(sizeof(struct atkbd), GFP_KERNEL);
dev = input_allocate_device();
if (!atkbd || !dev)
goto fail;
atkbd->dev = dev;
ps2_init(&atkbd->ps2dev, serio);
INIT_WORK(&atkbd->event_work, atkbd_event_work, atkbd);
mutex_init(&atkbd->event_mutex);
switch (serio->id.type) {
case SERIO_8042_XL:
atkbd->translated = 1;
case SERIO_8042:
if (serio->write)
atkbd->write = 1;
break;
}
atkbd->softraw = atkbd_softraw;
atkbd->softrepeat = atkbd_softrepeat;
atkbd->scroll = atkbd_scroll;
if (atkbd->softrepeat)
atkbd->softraw = 1;
serio_set_drvdata(serio, atkbd);
err = serio_open(serio, drv);
if (err)
goto fail;
if (atkbd->write) {
if (atkbd_probe(atkbd)) {
serio_close(serio);
err = -ENODEV;
goto fail;
}
atkbd->set = atkbd_select_set(atkbd, atkbd_set, atkbd_extra);
atkbd_activate(atkbd);
} else {
atkbd->set = 2;
atkbd->id = 0xab00;
}
atkbd_set_keycode_table(atkbd);
atkbd_set_device_attrs(atkbd);
device_create_file(&serio->dev, &atkbd_attr_extra);
device_create_file(&serio->dev, &atkbd_attr_scroll);
device_create_file(&serio->dev, &atkbd_attr_set);
device_create_file(&serio->dev, &atkbd_attr_softrepeat);
device_create_file(&serio->dev, &atkbd_attr_softraw);
atkbd_enable(atkbd);
input_register_device(atkbd->dev);
return 0;
fail: serio_set_drvdata(serio, NULL);
input_free_device(dev);
kfree(atkbd);
return err;
}
/*
* atkbd_reconnect() tries to restore keyboard into a sane state and is
* most likely called on resume.
*/
static int atkbd_reconnect(struct serio *serio)
{
struct atkbd *atkbd = serio_get_drvdata(serio);
struct serio_driver *drv = serio->drv;
if (!atkbd || !drv) {
printk(KERN_DEBUG "atkbd: reconnect request, but serio is disconnected, ignoring...\n");
return -1;
}
atkbd_disable(atkbd);
if (atkbd->write) {
if (atkbd_probe(atkbd))
return -1;
if (atkbd->set != atkbd_select_set(atkbd, atkbd->set, atkbd->extra))
return -1;
atkbd_activate(atkbd);
/*
* Restore repeat rate and LEDs (that were reset by atkbd_activate)
* to pre-resume state
*/
if (!atkbd->softrepeat)
atkbd_set_repeat_rate(atkbd);
atkbd_set_leds(atkbd);
}
atkbd_enable(atkbd);
return 0;
}
static struct serio_device_id atkbd_serio_ids[] = {
{
.type = SERIO_8042,
.proto = SERIO_ANY,
.id = SERIO_ANY,
.extra = SERIO_ANY,
},
{
.type = SERIO_8042_XL,
.proto = SERIO_ANY,
.id = SERIO_ANY,
.extra = SERIO_ANY,
},
{
.type = SERIO_RS232,
.proto = SERIO_PS2SER,
.id = SERIO_ANY,
.extra = SERIO_ANY,
},
{ 0 }
};
MODULE_DEVICE_TABLE(serio, atkbd_serio_ids);
static struct serio_driver atkbd_drv = {
.driver = {
.name = "atkbd",
},
.description = DRIVER_DESC,
.id_table = atkbd_serio_ids,
.interrupt = atkbd_interrupt,
.connect = atkbd_connect,
.reconnect = atkbd_reconnect,
.disconnect = atkbd_disconnect,
.cleanup = atkbd_cleanup,
};
static ssize_t atkbd_attr_show_helper(struct device *dev, char *buf,
ssize_t (*handler)(struct atkbd *, char *))
{
struct serio *serio = to_serio_port(dev);
int retval;
retval = serio_pin_driver(serio);
if (retval)
return retval;
if (serio->drv != &atkbd_drv) {
retval = -ENODEV;
goto out;
}
retval = handler((struct atkbd *)serio_get_drvdata(serio), buf);
out:
serio_unpin_driver(serio);
return retval;
}
static ssize_t atkbd_attr_set_helper(struct device *dev, const char *buf, size_t count,
ssize_t (*handler)(struct atkbd *, const char *, size_t))
{
struct serio *serio = to_serio_port(dev);
struct atkbd *atkbd;
int retval;
retval = serio_pin_driver(serio);
if (retval)
return retval;
if (serio->drv != &atkbd_drv) {
retval = -ENODEV;
goto out;
}
atkbd = serio_get_drvdata(serio);
atkbd_disable(atkbd);
retval = handler(atkbd, buf, count);
atkbd_enable(atkbd);
out:
serio_unpin_driver(serio);
return retval;
}
static ssize_t atkbd_show_extra(struct atkbd *atkbd, char *buf)
{
return sprintf(buf, "%d\n", atkbd->extra ? 1 : 0);
}
static ssize_t atkbd_set_extra(struct atkbd *atkbd, const char *buf, size_t count)
{
struct input_dev *new_dev;
unsigned long value;
char *rest;
if (!atkbd->write)
return -EIO;
value = simple_strtoul(buf, &rest, 10);
if (*rest || value > 1)
return -EINVAL;
if (atkbd->extra != value) {
/*
* Since device's properties will change we need to
* unregister old device. But allocate new one first
* to make sure we have it.
*/
if (!(new_dev = input_allocate_device()))
return -ENOMEM;
input_unregister_device(atkbd->dev);
atkbd->dev = new_dev;
atkbd->set = atkbd_select_set(atkbd, atkbd->set, value);
atkbd_activate(atkbd);
atkbd_set_device_attrs(atkbd);
input_register_device(atkbd->dev);
}
return count;
}
static ssize_t atkbd_show_scroll(struct atkbd *atkbd, char *buf)
{
return sprintf(buf, "%d\n", atkbd->scroll ? 1 : 0);
}
static ssize_t atkbd_set_scroll(struct atkbd *atkbd, const char *buf, size_t count)
{
struct input_dev *new_dev;
unsigned long value;
char *rest;
value = simple_strtoul(buf, &rest, 10);
if (*rest || value > 1)
return -EINVAL;
if (atkbd->scroll != value) {
if (!(new_dev = input_allocate_device()))
return -ENOMEM;
input_unregister_device(atkbd->dev);
atkbd->dev = new_dev;
atkbd->scroll = value;
atkbd_set_keycode_table(atkbd);
atkbd_set_device_attrs(atkbd);
input_register_device(atkbd->dev);
}
return count;
}
static ssize_t atkbd_show_set(struct atkbd *atkbd, char *buf)
{
return sprintf(buf, "%d\n", atkbd->set);
}
static ssize_t atkbd_set_set(struct atkbd *atkbd, const char *buf, size_t count)
{
struct input_dev *new_dev;
unsigned long value;
char *rest;
if (!atkbd->write)
return -EIO;
value = simple_strtoul(buf, &rest, 10);
if (*rest || (value != 2 && value != 3))
return -EINVAL;
if (atkbd->set != value) {
if (!(new_dev = input_allocate_device()))
return -ENOMEM;
input_unregister_device(atkbd->dev);
atkbd->dev = new_dev;
atkbd->set = atkbd_select_set(atkbd, value, atkbd->extra);
atkbd_activate(atkbd);
atkbd_set_keycode_table(atkbd);
atkbd_set_device_attrs(atkbd);
input_register_device(atkbd->dev);
}
return count;
}
static ssize_t atkbd_show_softrepeat(struct atkbd *atkbd, char *buf)
{
return sprintf(buf, "%d\n", atkbd->softrepeat ? 1 : 0);
}
static ssize_t atkbd_set_softrepeat(struct atkbd *atkbd, const char *buf, size_t count)
{
struct input_dev *new_dev;
unsigned long value;
char *rest;
if (!atkbd->write)
return -EIO;
value = simple_strtoul(buf, &rest, 10);
if (*rest || value > 1)
return -EINVAL;
if (atkbd->softrepeat != value) {
if (!(new_dev = input_allocate_device()))
return -ENOMEM;
input_unregister_device(atkbd->dev);
atkbd->dev = new_dev;
atkbd->softrepeat = value;
if (atkbd->softrepeat)
atkbd->softraw = 1;
atkbd_set_device_attrs(atkbd);
input_register_device(atkbd->dev);
}
return count;
}
static ssize_t atkbd_show_softraw(struct atkbd *atkbd, char *buf)
{
return sprintf(buf, "%d\n", atkbd->softraw ? 1 : 0);
}
static ssize_t atkbd_set_softraw(struct atkbd *atkbd, const char *buf, size_t count)
{
struct input_dev *new_dev;
unsigned long value;
char *rest;
value = simple_strtoul(buf, &rest, 10);
if (*rest || value > 1)
return -EINVAL;
if (atkbd->softraw != value) {
if (!(new_dev = input_allocate_device()))
return -ENOMEM;
input_unregister_device(atkbd->dev);
atkbd->dev = new_dev;
atkbd->softraw = value;
atkbd_set_device_attrs(atkbd);
input_register_device(atkbd->dev);
}
return count;
}
static int __init atkbd_init(void)
{
serio_register_driver(&atkbd_drv);
return 0;
}
static void __exit atkbd_exit(void)
{
serio_unregister_driver(&atkbd_drv);
}
module_init(atkbd_init);
module_exit(atkbd_exit);
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