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linux/drivers/input/mouse/vsxxxaa.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

587 lines
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/*
* Driver for DEC VSXXX-AA mouse (hockey-puck mouse, ball or two rollers)
* DEC VSXXX-GA mouse (rectangular mouse, with ball)
* DEC VSXXX-AB tablet (digitizer with hair cross or stylus)
*
* Copyright (C) 2003-2004 by Jan-Benedict Glaw <jbglaw@lug-owl.de>
*
* The packet format was initially taken from a patch to GPM which is (C) 2001
* by Karsten Merker <merker@linuxtag.org>
* and Maciej W. Rozycki <macro@ds2.pg.gda.pl>
* Later on, I had access to the device's documentation (referenced below).
*/
/*
* 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
*/
/*
* Building an adaptor to DE9 / DB25 RS232
* ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
*
* DISCLAIMER: Use this description AT YOUR OWN RISK! I'll not pay for
* anything if you break your mouse, your computer or whatever!
*
* In theory, this mouse is a simple RS232 device. In practice, it has got
* a quite uncommon plug and the requirement to additionally get a power
* supply at +5V and -12V.
*
* If you look at the socket/jack (_not_ at the plug), we use this pin
* numbering:
* _______
* / 7 6 5 \
* | 4 --- 3 |
* \ 2 1 /
* -------
*
* DEC socket DE9 DB25 Note
* 1 (GND) 5 7 -
* 2 (RxD) 2 3 -
* 3 (TxD) 3 2 -
* 4 (-12V) - - Somewhere from the PSU. At ATX, it's
* the thin blue wire at pin 12 of the
* ATX power connector. Only required for
* VSXXX-AA/-GA mice.
* 5 (+5V) - - PSU (red wires of ATX power connector
* on pin 4, 6, 19 or 20) or HDD power
* connector (also red wire).
* 6 (+12V) - - HDD power connector, yellow wire. Only
* required for VSXXX-AB digitizer.
* 7 (dev. avail.) - - The mouse shorts this one to pin 1.
* This way, the host computer can detect
* the mouse. To use it with the adaptor,
* simply don't connect this pin.
*
* So to get a working adaptor, you need to connect the mouse with three
* wires to a RS232 port and two or three additional wires for +5V, +12V and
* -12V to the PSU.
*
* Flow specification for the link is 4800, 8o1.
*
* The mice and tablet are described in "VCB02 Video Subsystem - Technical
* Manual", DEC EK-104AA-TM-001. You'll find it at MANX, a search engine
* specific for DEC documentation. Try
* http://www.vt100.net/manx/details?pn=EK-104AA-TM-001;id=21;cp=1
*/
#include <linux/delay.h>
#include <linux/module.h>
#include <linux/slab.h>
#include <linux/interrupt.h>
#include <linux/input.h>
#include <linux/serio.h>
#include <linux/init.h>
#define DRIVER_DESC "Driver for DEC VSXXX-AA and -GA mice and VSXXX-AB tablet"
MODULE_AUTHOR ("Jan-Benedict Glaw <jbglaw@lug-owl.de>");
MODULE_DESCRIPTION (DRIVER_DESC);
MODULE_LICENSE ("GPL");
#undef VSXXXAA_DEBUG
#ifdef VSXXXAA_DEBUG
#define DBG(x...) printk (x)
#else
#define DBG(x...) do {} while (0)
#endif
#define VSXXXAA_INTRO_MASK 0x80
#define VSXXXAA_INTRO_HEAD 0x80
#define IS_HDR_BYTE(x) (((x) & VSXXXAA_INTRO_MASK) \
== VSXXXAA_INTRO_HEAD)
#define VSXXXAA_PACKET_MASK 0xe0
#define VSXXXAA_PACKET_REL 0x80
#define VSXXXAA_PACKET_ABS 0xc0
#define VSXXXAA_PACKET_POR 0xa0
#define MATCH_PACKET_TYPE(data, type) (((data) & VSXXXAA_PACKET_MASK) == (type))
struct vsxxxaa {
struct input_dev *dev;
struct serio *serio;
#define BUFLEN 15 /* At least 5 is needed for a full tablet packet */
unsigned char buf[BUFLEN];
unsigned char count;
unsigned char version;
unsigned char country;
unsigned char type;
char name[64];
char phys[32];
};
static void
vsxxxaa_drop_bytes (struct vsxxxaa *mouse, int num)
{
if (num >= mouse->count)
mouse->count = 0;
else {
memmove (mouse->buf, mouse->buf + num - 1, BUFLEN - num);
mouse->count -= num;
}
}
static void
vsxxxaa_queue_byte (struct vsxxxaa *mouse, unsigned char byte)
{
if (mouse->count == BUFLEN) {
printk (KERN_ERR "%s on %s: Dropping a byte of full buffer.\n",
mouse->name, mouse->phys);
vsxxxaa_drop_bytes (mouse, 1);
}
DBG (KERN_INFO "Queueing byte 0x%02x\n", byte);
mouse->buf[mouse->count++] = byte;
}
static void
vsxxxaa_detection_done (struct vsxxxaa *mouse)
{
switch (mouse->type) {
case 0x02:
strlcpy (mouse->name, "DEC VSXXX-AA/-GA mouse",
sizeof (mouse->name));
break;
case 0x04:
strlcpy (mouse->name, "DEC VSXXX-AB digitizer",
sizeof (mouse->name));
break;
default:
snprintf (mouse->name, sizeof (mouse->name),
"unknown DEC pointer device (type = 0x%02x)",
mouse->type);
break;
}
printk (KERN_INFO
"Found %s version 0x%02x from country 0x%02x on port %s\n",
mouse->name, mouse->version, mouse->country, mouse->phys);
}
/*
* Returns number of bytes to be dropped, 0 if packet is okay.
*/
static int
vsxxxaa_check_packet (struct vsxxxaa *mouse, int packet_len)
{
int i;
/* First byte must be a header byte */
if (!IS_HDR_BYTE (mouse->buf[0])) {
DBG ("vsck: len=%d, 1st=0x%02x\n", packet_len, mouse->buf[0]);
return 1;
}
/* Check all following bytes */
if (packet_len > 1) {
for (i = 1; i < packet_len; i++) {
if (IS_HDR_BYTE (mouse->buf[i])) {
printk (KERN_ERR "Need to drop %d bytes "
"of a broken packet.\n",
i - 1);
DBG (KERN_INFO "check: len=%d, b[%d]=0x%02x\n",
packet_len, i, mouse->buf[i]);
return i - 1;
}
}
}
return 0;
}
static __inline__ int
vsxxxaa_smells_like_packet (struct vsxxxaa *mouse, unsigned char type, size_t len)
{
return (mouse->count >= len) && MATCH_PACKET_TYPE (mouse->buf[0], type);
}
static void
vsxxxaa_handle_REL_packet (struct vsxxxaa *mouse)
{
struct input_dev *dev = mouse->dev;
unsigned char *buf = mouse->buf;
int left, middle, right;
int dx, dy;
/*
* Check for normal stream packets. This is three bytes,
* with the first byte's 3 MSB set to 100.
*
* [0]: 1 0 0 SignX SignY Left Middle Right
* [1]: 0 dx dx dx dx dx dx dx
* [2]: 0 dy dy dy dy dy dy dy
*/
/*
* Low 7 bit of byte 1 are abs(dx), bit 7 is
* 0, bit 4 of byte 0 is direction.
*/
dx = buf[1] & 0x7f;
dx *= ((buf[0] >> 4) & 0x01)? 1: -1;
/*
* Low 7 bit of byte 2 are abs(dy), bit 7 is
* 0, bit 3 of byte 0 is direction.
*/
dy = buf[2] & 0x7f;
dy *= ((buf[0] >> 3) & 0x01)? -1: 1;
/*
* Get button state. It's the low three bits
* (for three buttons) of byte 0.
*/
left = (buf[0] & 0x04)? 1: 0;
middle = (buf[0] & 0x02)? 1: 0;
right = (buf[0] & 0x01)? 1: 0;
vsxxxaa_drop_bytes (mouse, 3);
DBG (KERN_INFO "%s on %s: dx=%d, dy=%d, buttons=%s%s%s\n",
mouse->name, mouse->phys, dx, dy,
left? "L": "l", middle? "M": "m", right? "R": "r");
/*
* Report what we've found so far...
*/
input_report_key (dev, BTN_LEFT, left);
input_report_key (dev, BTN_MIDDLE, middle);
input_report_key (dev, BTN_RIGHT, right);
input_report_key (dev, BTN_TOUCH, 0);
input_report_rel (dev, REL_X, dx);
input_report_rel (dev, REL_Y, dy);
input_sync (dev);
}
static void
vsxxxaa_handle_ABS_packet (struct vsxxxaa *mouse)
{
struct input_dev *dev = mouse->dev;
unsigned char *buf = mouse->buf;
int left, middle, right, touch;
int x, y;
/*
* Tablet position / button packet
*
* [0]: 1 1 0 B4 B3 B2 B1 Pr
* [1]: 0 0 X5 X4 X3 X2 X1 X0
* [2]: 0 0 X11 X10 X9 X8 X7 X6
* [3]: 0 0 Y5 Y4 Y3 Y2 Y1 Y0
* [4]: 0 0 Y11 Y10 Y9 Y8 Y7 Y6
*/
/*
* Get X/Y position. Y axis needs to be inverted since VSXXX-AB
* counts down->top while monitor counts top->bottom.
*/
x = ((buf[2] & 0x3f) << 6) | (buf[1] & 0x3f);
y = ((buf[4] & 0x3f) << 6) | (buf[3] & 0x3f);
y = 1023 - y;
/*
* Get button state. It's bits <4..1> of byte 0.
*/
left = (buf[0] & 0x02)? 1: 0;
middle = (buf[0] & 0x04)? 1: 0;
right = (buf[0] & 0x08)? 1: 0;
touch = (buf[0] & 0x10)? 1: 0;
vsxxxaa_drop_bytes (mouse, 5);
DBG (KERN_INFO "%s on %s: x=%d, y=%d, buttons=%s%s%s%s\n",
mouse->name, mouse->phys, x, y,
left? "L": "l", middle? "M": "m",
right? "R": "r", touch? "T": "t");
/*
* Report what we've found so far...
*/
input_report_key (dev, BTN_LEFT, left);
input_report_key (dev, BTN_MIDDLE, middle);
input_report_key (dev, BTN_RIGHT, right);
input_report_key (dev, BTN_TOUCH, touch);
input_report_abs (dev, ABS_X, x);
input_report_abs (dev, ABS_Y, y);
input_sync (dev);
}
static void
vsxxxaa_handle_POR_packet (struct vsxxxaa *mouse)
{
struct input_dev *dev = mouse->dev;
unsigned char *buf = mouse->buf;
int left, middle, right;
unsigned char error;
/*
* Check for Power-On-Reset packets. These are sent out
* after plugging the mouse in, or when explicitely
* requested by sending 'T'.
*
* [0]: 1 0 1 0 R3 R2 R1 R0
* [1]: 0 M2 M1 M0 D3 D2 D1 D0
* [2]: 0 E6 E5 E4 E3 E2 E1 E0
* [3]: 0 0 0 0 0 Left Middle Right
*
* M: manufacturer location code
* R: revision code
* E: Error code. If it's in the range of 0x00..0x1f, only some
* minor problem occured. Errors >= 0x20 are considered bad
* and the device may not work properly...
* D: <0010> == mouse, <0100> == tablet
*/
mouse->version = buf[0] & 0x0f;
mouse->country = (buf[1] >> 4) & 0x07;
mouse->type = buf[1] & 0x0f;
error = buf[2] & 0x7f;
/*
* Get button state. It's the low three bits
* (for three buttons) of byte 0. Maybe even the bit <3>
* has some meaning if a tablet is attached.
*/
left = (buf[0] & 0x04)? 1: 0;
middle = (buf[0] & 0x02)? 1: 0;
right = (buf[0] & 0x01)? 1: 0;
vsxxxaa_drop_bytes (mouse, 4);
vsxxxaa_detection_done (mouse);
if (error <= 0x1f) {
/* No (serious) error. Report buttons */
input_report_key (dev, BTN_LEFT, left);
input_report_key (dev, BTN_MIDDLE, middle);
input_report_key (dev, BTN_RIGHT, right);
input_report_key (dev, BTN_TOUCH, 0);
input_sync (dev);
if (error != 0)
printk (KERN_INFO "Your %s on %s reports error=0x%02x\n",
mouse->name, mouse->phys, error);
}
/*
* If the mouse was hot-plugged, we need to force differential mode
* now... However, give it a second to recover from it's reset.
*/
printk (KERN_NOTICE "%s on %s: Forceing standard packet format, "
"incremental streaming mode and 72 samples/sec\n",
mouse->name, mouse->phys);
mouse->serio->write (mouse->serio, 'S'); /* Standard format */
mdelay (50);
mouse->serio->write (mouse->serio, 'R'); /* Incremental */
mdelay (50);
mouse->serio->write (mouse->serio, 'L'); /* 72 samples/sec */
}
static void
vsxxxaa_parse_buffer (struct vsxxxaa *mouse)
{
unsigned char *buf = mouse->buf;
int stray_bytes;
/*
* Parse buffer to death...
*/
do {
/*
* Out of sync? Throw away what we don't understand. Each
* packet starts with a byte whose bit 7 is set. Unhandled
* packets (ie. which we don't know about or simply b0rk3d
* data...) will get shifted out of the buffer after some
* activity on the mouse.
*/
while (mouse->count > 0 && !IS_HDR_BYTE(buf[0])) {
printk (KERN_ERR "%s on %s: Dropping a byte to regain "
"sync with mouse data stream...\n",
mouse->name, mouse->phys);
vsxxxaa_drop_bytes (mouse, 1);
}
/*
* Check for packets we know about.
*/
if (vsxxxaa_smells_like_packet (mouse, VSXXXAA_PACKET_REL, 3)) {
/* Check for broken packet */
stray_bytes = vsxxxaa_check_packet (mouse, 3);
if (stray_bytes > 0) {
printk (KERN_ERR "Dropping %d bytes now...\n",
stray_bytes);
vsxxxaa_drop_bytes (mouse, stray_bytes);
continue;
}
vsxxxaa_handle_REL_packet (mouse);
continue; /* More to parse? */
}
if (vsxxxaa_smells_like_packet (mouse, VSXXXAA_PACKET_ABS, 5)) {
/* Check for broken packet */
stray_bytes = vsxxxaa_check_packet (mouse, 5);
if (stray_bytes > 0) {
printk (KERN_ERR "Dropping %d bytes now...\n",
stray_bytes);
vsxxxaa_drop_bytes (mouse, stray_bytes);
continue;
}
vsxxxaa_handle_ABS_packet (mouse);
continue; /* More to parse? */
}
if (vsxxxaa_smells_like_packet (mouse, VSXXXAA_PACKET_POR, 4)) {
/* Check for broken packet */
stray_bytes = vsxxxaa_check_packet (mouse, 4);
if (stray_bytes > 0) {
printk (KERN_ERR "Dropping %d bytes now...\n",
stray_bytes);
vsxxxaa_drop_bytes (mouse, stray_bytes);
continue;
}
vsxxxaa_handle_POR_packet (mouse);
continue; /* More to parse? */
}
break; /* No REL, ABS or POR packet found */
} while (1);
}
static irqreturn_t
vsxxxaa_interrupt (struct serio *serio, unsigned char data, unsigned int flags)
{
struct vsxxxaa *mouse = serio_get_drvdata (serio);
vsxxxaa_queue_byte (mouse, data);
vsxxxaa_parse_buffer (mouse);
return IRQ_HANDLED;
}
static void
vsxxxaa_disconnect (struct serio *serio)
{
struct vsxxxaa *mouse = serio_get_drvdata (serio);
serio_close (serio);
serio_set_drvdata (serio, NULL);
input_unregister_device (mouse->dev);
kfree (mouse);
}
static int
vsxxxaa_connect (struct serio *serio, struct serio_driver *drv)
{
struct vsxxxaa *mouse;
struct input_dev *input_dev;
int err = -ENOMEM;
mouse = kzalloc (sizeof (struct vsxxxaa), GFP_KERNEL);
input_dev = input_allocate_device ();
if (!mouse || !input_dev)
goto fail;
mouse->dev = input_dev;
mouse->serio = serio;
strlcat (mouse->name, "DEC VSXXX-AA/-GA mouse or VSXXX-AB digitizer",
sizeof (mouse->name));
snprintf (mouse->phys, sizeof (mouse->phys), "%s/input0", serio->phys);
input_dev->name = mouse->name;
input_dev->phys = mouse->phys;
input_dev->id.bustype = BUS_RS232;
input_dev->cdev.dev = &serio->dev;
input_dev->private = mouse;
set_bit (EV_KEY, input_dev->evbit); /* We have buttons */
set_bit (EV_REL, input_dev->evbit);
set_bit (EV_ABS, input_dev->evbit);
set_bit (BTN_LEFT, input_dev->keybit); /* We have 3 buttons */
set_bit (BTN_MIDDLE, input_dev->keybit);
set_bit (BTN_RIGHT, input_dev->keybit);
set_bit (BTN_TOUCH, input_dev->keybit); /* ...and Tablet */
set_bit (REL_X, input_dev->relbit);
set_bit (REL_Y, input_dev->relbit);
input_set_abs_params (input_dev, ABS_X, 0, 1023, 0, 0);
input_set_abs_params (input_dev, ABS_Y, 0, 1023, 0, 0);
serio_set_drvdata (serio, mouse);
err = serio_open (serio, drv);
if (err)
goto fail;
/*
* Request selftest. Standard packet format and differential
* mode will be requested after the device ID'ed successfully.
*/
serio->write (serio, 'T'); /* Test */
input_register_device (input_dev);
return 0;
fail: serio_set_drvdata (serio, NULL);
input_free_device (input_dev);
kfree (mouse);
return err;
}
static struct serio_device_id vsxxaa_serio_ids[] = {
{
.type = SERIO_RS232,
.proto = SERIO_VSXXXAA,
.id = SERIO_ANY,
.extra = SERIO_ANY,
},
{ 0 }
};
MODULE_DEVICE_TABLE(serio, vsxxaa_serio_ids);
static struct serio_driver vsxxxaa_drv = {
.driver = {
.name = "vsxxxaa",
},
.description = DRIVER_DESC,
.id_table = vsxxaa_serio_ids,
.connect = vsxxxaa_connect,
.interrupt = vsxxxaa_interrupt,
.disconnect = vsxxxaa_disconnect,
};
static int __init
vsxxxaa_init (void)
{
serio_register_driver(&vsxxxaa_drv);
return 0;
}
static void __exit
vsxxxaa_exit (void)
{
serio_unregister_driver(&vsxxxaa_drv);
}
module_init (vsxxxaa_init);
module_exit (vsxxxaa_exit);
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