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android_kernel_samsung_msm8976/drivers/input/keyboard/sunkbd.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

359 lines
9.2 KiB
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/*
* $Id: sunkbd.c,v 1.14 2001/09/25 10:12:07 vojtech Exp $
*
* Copyright (c) 1999-2001 Vojtech Pavlik
*/
/*
* Sun keyboard driver for Linux
*/
/*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*
* Should you need to contact me, the author, you can do so either by
* e-mail - mail your message to <vojtech@ucw.cz>, or by paper mail:
* Vojtech Pavlik, Simunkova 1594, Prague 8, 182 00 Czech Republic
*/
#include <linux/delay.h>
#include <linux/slab.h>
#include <linux/module.h>
#include <linux/interrupt.h>
#include <linux/init.h>
#include <linux/input.h>
#include <linux/serio.h>
#include <linux/workqueue.h>
#define DRIVER_DESC "Sun keyboard driver"
MODULE_AUTHOR("Vojtech Pavlik <vojtech@ucw.cz>");
MODULE_DESCRIPTION(DRIVER_DESC);
MODULE_LICENSE("GPL");
static unsigned char sunkbd_keycode[128] = {
0,128,114,129,115, 59, 60, 68, 61, 87, 62, 88, 63,100, 64,112,
65, 66, 67, 56,103,119, 99, 70,105,130,131,108,106, 1, 2, 3,
4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 41, 14,110,113, 98, 55,
116,132, 83,133,102, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25,
26, 27,111,127, 71, 72, 73, 74,134,135,107, 0, 29, 30, 31, 32,
33, 34, 35, 36, 37, 38, 39, 40, 43, 28, 96, 75, 76, 77, 82,136,
104,137, 69, 42, 44, 45, 46, 47, 48, 49, 50, 51, 52, 53, 54,101,
79, 80, 81, 0, 0, 0,138, 58,125, 57,126,109, 86, 78
};
#define SUNKBD_CMD_RESET 0x1
#define SUNKBD_CMD_BELLON 0x2
#define SUNKBD_CMD_BELLOFF 0x3
#define SUNKBD_CMD_CLICK 0xa
#define SUNKBD_CMD_NOCLICK 0xb
#define SUNKBD_CMD_SETLED 0xe
#define SUNKBD_CMD_LAYOUT 0xf
#define SUNKBD_RET_RESET 0xff
#define SUNKBD_RET_ALLUP 0x7f
#define SUNKBD_RET_LAYOUT 0xfe
#define SUNKBD_LAYOUT_5_MASK 0x20
#define SUNKBD_RELEASE 0x80
#define SUNKBD_KEY 0x7f
/*
* Per-keyboard data.
*/
struct sunkbd {
unsigned char keycode[128];
struct input_dev *dev;
struct serio *serio;
struct work_struct tq;
wait_queue_head_t wait;
char name[64];
char phys[32];
char type;
unsigned char enabled;
volatile s8 reset;
volatile s8 layout;
};
/*
* sunkbd_interrupt() is called by the low level driver when a character
* is received.
*/
static irqreturn_t sunkbd_interrupt(struct serio *serio,
unsigned char data, unsigned int flags)
{
struct sunkbd* sunkbd = serio_get_drvdata(serio);
if (sunkbd->reset <= -1) { /* If cp[i] is 0xff, sunkbd->reset will stay -1. */
sunkbd->reset = data; /* The keyboard sends 0xff 0xff 0xID on powerup */
wake_up_interruptible(&sunkbd->wait);
goto out;
}
if (sunkbd->layout == -1) {
sunkbd->layout = data;
wake_up_interruptible(&sunkbd->wait);
goto out;
}
switch (data) {
case SUNKBD_RET_RESET:
schedule_work(&sunkbd->tq);
sunkbd->reset = -1;
break;
case SUNKBD_RET_LAYOUT:
sunkbd->layout = -1;
break;
case SUNKBD_RET_ALLUP: /* All keys released */
break;
default:
if (!sunkbd->enabled)
break;
if (sunkbd->keycode[data & SUNKBD_KEY]) {
input_report_key(sunkbd->dev, sunkbd->keycode[data & SUNKBD_KEY], !(data & SUNKBD_RELEASE));
input_sync(sunkbd->dev);
} else {
printk(KERN_WARNING "sunkbd.c: Unknown key (scancode %#x) %s.\n",
data & SUNKBD_KEY, data & SUNKBD_RELEASE ? "released" : "pressed");
}
}
out:
return IRQ_HANDLED;
}
/*
* sunkbd_event() handles events from the input module.
*/
static int sunkbd_event(struct input_dev *dev, unsigned int type, unsigned int code, int value)
{
struct sunkbd *sunkbd = dev->private;
switch (type) {
case EV_LED:
sunkbd->serio->write(sunkbd->serio, SUNKBD_CMD_SETLED);
sunkbd->serio->write(sunkbd->serio,
(!!test_bit(LED_CAPSL, dev->led) << 3) | (!!test_bit(LED_SCROLLL, dev->led) << 2) |
(!!test_bit(LED_COMPOSE, dev->led) << 1) | !!test_bit(LED_NUML, dev->led));
return 0;
case EV_SND:
switch (code) {
case SND_CLICK:
sunkbd->serio->write(sunkbd->serio, SUNKBD_CMD_NOCLICK - value);
return 0;
case SND_BELL:
sunkbd->serio->write(sunkbd->serio, SUNKBD_CMD_BELLOFF - value);
return 0;
}
break;
}
return -1;
}
/*
* sunkbd_initialize() checks for a Sun keyboard attached, and determines
* its type.
*/
static int sunkbd_initialize(struct sunkbd *sunkbd)
{
sunkbd->reset = -2;
sunkbd->serio->write(sunkbd->serio, SUNKBD_CMD_RESET);
wait_event_interruptible_timeout(sunkbd->wait, sunkbd->reset >= 0, HZ);
if (sunkbd->reset < 0)
return -1;
sunkbd->type = sunkbd->reset;
if (sunkbd->type == 4) { /* Type 4 keyboard */
sunkbd->layout = -2;
sunkbd->serio->write(sunkbd->serio, SUNKBD_CMD_LAYOUT);
wait_event_interruptible_timeout(sunkbd->wait, sunkbd->layout >= 0, HZ/4);
if (sunkbd->layout < 0) return -1;
if (sunkbd->layout & SUNKBD_LAYOUT_5_MASK) sunkbd->type = 5;
}
return 0;
}
/*
* sunkbd_reinit() sets leds and beeps to a state the computer remembers they
* were in.
*/
static void sunkbd_reinit(void *data)
{
struct sunkbd *sunkbd = data;
wait_event_interruptible_timeout(sunkbd->wait, sunkbd->reset >= 0, HZ);
sunkbd->serio->write(sunkbd->serio, SUNKBD_CMD_SETLED);
sunkbd->serio->write(sunkbd->serio,
(!!test_bit(LED_CAPSL, sunkbd->dev->led) << 3) | (!!test_bit(LED_SCROLLL, sunkbd->dev->led) << 2) |
(!!test_bit(LED_COMPOSE, sunkbd->dev->led) << 1) | !!test_bit(LED_NUML, sunkbd->dev->led));
sunkbd->serio->write(sunkbd->serio, SUNKBD_CMD_NOCLICK - !!test_bit(SND_CLICK, sunkbd->dev->snd));
sunkbd->serio->write(sunkbd->serio, SUNKBD_CMD_BELLOFF - !!test_bit(SND_BELL, sunkbd->dev->snd));
}
static void sunkbd_enable(struct sunkbd *sunkbd, int enable)
{
serio_pause_rx(sunkbd->serio);
sunkbd->enabled = 1;
serio_continue_rx(sunkbd->serio);
}
/*
* sunkbd_connect() probes for a Sun keyboard and fills the necessary structures.
*/
static int sunkbd_connect(struct serio *serio, struct serio_driver *drv)
{
struct sunkbd *sunkbd;
struct input_dev *input_dev;
int err = -ENOMEM;
int i;
sunkbd = kzalloc(sizeof(struct sunkbd), GFP_KERNEL);
input_dev = input_allocate_device();
if (!sunkbd || !input_dev)
goto fail;
sunkbd->serio = serio;
sunkbd->dev = input_dev;
init_waitqueue_head(&sunkbd->wait);
INIT_WORK(&sunkbd->tq, sunkbd_reinit, sunkbd);
snprintf(sunkbd->phys, sizeof(sunkbd->phys), "%s/input0", serio->phys);
serio_set_drvdata(serio, sunkbd);
err = serio_open(serio, drv);
if (err)
goto fail;
if (sunkbd_initialize(sunkbd) < 0) {
serio_close(serio);
goto fail;
}
snprintf(sunkbd->name, sizeof(sunkbd->name), "Sun Type %d keyboard", sunkbd->type);
memcpy(sunkbd->keycode, sunkbd_keycode, sizeof(sunkbd->keycode));
input_dev->name = sunkbd->name;
input_dev->phys = sunkbd->phys;
input_dev->id.bustype = BUS_RS232;
input_dev->id.vendor = SERIO_SUNKBD;
input_dev->id.product = sunkbd->type;
input_dev->id.version = 0x0100;
input_dev->cdev.dev = &serio->dev;
input_dev->private = sunkbd;
input_dev->event = sunkbd_event;
input_dev->evbit[0] = BIT(EV_KEY) | BIT(EV_LED) | BIT(EV_SND) | BIT(EV_REP);
input_dev->ledbit[0] = BIT(LED_CAPSL) | BIT(LED_COMPOSE) | BIT(LED_SCROLLL) | BIT(LED_NUML);
input_dev->sndbit[0] = BIT(SND_CLICK) | BIT(SND_BELL);
input_dev->keycode = sunkbd->keycode;
input_dev->keycodesize = sizeof(unsigned char);
input_dev->keycodemax = ARRAY_SIZE(sunkbd_keycode);
for (i = 0; i < 128; i++)
set_bit(sunkbd->keycode[i], input_dev->keybit);
clear_bit(0, input_dev->keybit);
sunkbd_enable(sunkbd, 1);
input_register_device(sunkbd->dev);
return 0;
fail: serio_set_drvdata(serio, NULL);
input_free_device(input_dev);
kfree(sunkbd);
return err;
}
/*
* sunkbd_disconnect() unregisters and closes behind us.
*/
static void sunkbd_disconnect(struct serio *serio)
{
struct sunkbd *sunkbd = serio_get_drvdata(serio);
sunkbd_enable(sunkbd, 0);
input_unregister_device(sunkbd->dev);
serio_close(serio);
serio_set_drvdata(serio, NULL);
kfree(sunkbd);
}
static struct serio_device_id sunkbd_serio_ids[] = {
{
.type = SERIO_RS232,
.proto = SERIO_SUNKBD,
.id = SERIO_ANY,
.extra = SERIO_ANY,
},
{
.type = SERIO_RS232,
.proto = SERIO_UNKNOWN, /* sunkbd does probe */
.id = SERIO_ANY,
.extra = SERIO_ANY,
},
{ 0 }
};
MODULE_DEVICE_TABLE(serio, sunkbd_serio_ids);
static struct serio_driver sunkbd_drv = {
.driver = {
.name = "sunkbd",
},
.description = DRIVER_DESC,
.id_table = sunkbd_serio_ids,
.interrupt = sunkbd_interrupt,
.connect = sunkbd_connect,
.disconnect = sunkbd_disconnect,
};
/*
* The functions for insering/removing us as a module.
*/
static int __init sunkbd_init(void)
{
serio_register_driver(&sunkbd_drv);
return 0;
}
static void __exit sunkbd_exit(void)
{
serio_unregister_driver(&sunkbd_drv);
}
module_init(sunkbd_init);
module_exit(sunkbd_exit);
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