2005-04-17 02:20:36 +04:00
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/*
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* MicroTouch (3M) serial touchscreen driver
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*
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* Copyright (c) 2004 Vojtech Pavlik
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*/
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/*
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* This program is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License version 2 as published by
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* the Free Software Foundation.
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*/
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/*
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* 2005/02/19 Dan Streetman <ddstreet@ieee.org>
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* Copied elo.c and edited for MicroTouch protocol
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*/
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#include <linux/errno.h>
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#include <linux/kernel.h>
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#include <linux/module.h>
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#include <linux/slab.h>
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#include <linux/input.h>
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#include <linux/serio.h>
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#include <linux/init.h>
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#define DRIVER_DESC "MicroTouch serial touchscreen driver"
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MODULE_AUTHOR("Vojtech Pavlik <vojtech@ucw.cz>");
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MODULE_DESCRIPTION(DRIVER_DESC);
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MODULE_LICENSE("GPL");
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/*
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* Definitions & global arrays.
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*/
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#define MTOUCH_FORMAT_TABLET_STATUS_BIT 0x80
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#define MTOUCH_FORMAT_TABLET_TOUCH_BIT 0x40
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#define MTOUCH_FORMAT_TABLET_LENGTH 5
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#define MTOUCH_RESPONSE_BEGIN_BYTE 0x01
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#define MTOUCH_RESPONSE_END_BYTE 0x0d
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/* todo: check specs for max length of all responses */
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#define MTOUCH_MAX_LENGTH 16
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#define MTOUCH_MIN_XC 0
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#define MTOUCH_MAX_XC 0x3fff
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#define MTOUCH_MIN_YC 0
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#define MTOUCH_MAX_YC 0x3fff
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#define MTOUCH_GET_XC(data) (((data[2])<<7) | data[1])
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#define MTOUCH_GET_YC(data) (((data[4])<<7) | data[3])
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#define MTOUCH_GET_TOUCHED(data) (MTOUCH_FORMAT_TABLET_TOUCH_BIT & data[0])
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/*
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* Per-touchscreen data.
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*/
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struct mtouch {
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2005-09-15 11:01:46 +04:00
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struct input_dev *dev;
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2005-04-17 02:20:36 +04:00
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struct serio *serio;
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int idx;
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unsigned char data[MTOUCH_MAX_LENGTH];
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char phys[32];
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};
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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 17:55:46 +04:00
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static void mtouch_process_format_tablet(struct mtouch *mtouch)
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2005-04-17 02:20:36 +04:00
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{
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2005-09-15 11:01:46 +04:00
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struct input_dev *dev = mtouch->dev;
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2005-04-17 02:20:36 +04:00
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if (MTOUCH_FORMAT_TABLET_LENGTH == ++mtouch->idx) {
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input_report_abs(dev, ABS_X, MTOUCH_GET_XC(mtouch->data));
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input_report_abs(dev, ABS_Y, MTOUCH_MAX_YC - MTOUCH_GET_YC(mtouch->data));
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input_report_key(dev, BTN_TOUCH, MTOUCH_GET_TOUCHED(mtouch->data));
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input_sync(dev);
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mtouch->idx = 0;
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}
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}
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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 17:55:46 +04:00
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static void mtouch_process_response(struct mtouch *mtouch)
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2005-04-17 02:20:36 +04:00
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{
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if (MTOUCH_RESPONSE_END_BYTE == mtouch->data[mtouch->idx++]) {
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/* FIXME - process response */
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mtouch->idx = 0;
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} else if (MTOUCH_MAX_LENGTH == mtouch->idx) {
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printk(KERN_ERR "mtouch.c: too many response bytes\n");
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mtouch->idx = 0;
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}
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}
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static irqreturn_t mtouch_interrupt(struct serio *serio,
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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 17:55:46 +04:00
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unsigned char data, unsigned int flags)
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2005-04-17 02:20:36 +04:00
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{
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struct mtouch* mtouch = serio_get_drvdata(serio);
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mtouch->data[mtouch->idx] = data;
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if (MTOUCH_FORMAT_TABLET_STATUS_BIT & mtouch->data[0])
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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 17:55:46 +04:00
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mtouch_process_format_tablet(mtouch);
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2005-04-17 02:20:36 +04:00
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else if (MTOUCH_RESPONSE_BEGIN_BYTE == mtouch->data[0])
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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 17:55:46 +04:00
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mtouch_process_response(mtouch);
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2005-04-17 02:20:36 +04:00
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else
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printk(KERN_DEBUG "mtouch.c: unknown/unsynchronized data from device, byte %x\n",mtouch->data[0]);
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return IRQ_HANDLED;
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}
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/*
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* mtouch_disconnect() is the opposite of mtouch_connect()
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*/
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static void mtouch_disconnect(struct serio *serio)
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{
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struct mtouch* mtouch = serio_get_drvdata(serio);
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2005-09-15 11:01:46 +04:00
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input_get_device(mtouch->dev);
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input_unregister_device(mtouch->dev);
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2005-04-17 02:20:36 +04:00
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serio_close(serio);
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serio_set_drvdata(serio, NULL);
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2005-09-15 11:01:46 +04:00
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input_put_device(mtouch->dev);
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2005-04-17 02:20:36 +04:00
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kfree(mtouch);
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}
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/*
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* mtouch_connect() is the routine that is called when someone adds a
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* new serio device that supports MicroTouch (Format Tablet) protocol and registers it as
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* an input device.
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*/
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static int mtouch_connect(struct serio *serio, struct serio_driver *drv)
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{
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struct mtouch *mtouch;
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2005-09-15 11:01:46 +04:00
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struct input_dev *input_dev;
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2005-04-17 02:20:36 +04:00
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int err;
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2005-09-15 11:01:46 +04:00
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mtouch = kzalloc(sizeof(struct mtouch), GFP_KERNEL);
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input_dev = input_allocate_device();
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if (!mtouch || !input_dev) {
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err = -ENOMEM;
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goto fail;
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}
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2005-04-17 02:20:36 +04:00
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mtouch->serio = serio;
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2005-09-15 11:01:46 +04:00
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mtouch->dev = input_dev;
|
2006-06-26 09:46:04 +04:00
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snprintf(mtouch->phys, sizeof(mtouch->phys), "%s/input0", serio->phys);
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2005-04-17 02:20:36 +04:00
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2005-09-15 11:01:46 +04:00
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input_dev->private = mtouch;
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input_dev->name = "MicroTouch Serial TouchScreen";
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input_dev->phys = mtouch->phys;
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input_dev->id.bustype = BUS_RS232;
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input_dev->id.vendor = SERIO_MICROTOUCH;
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input_dev->id.product = 0;
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input_dev->id.version = 0x0100;
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input_dev->evbit[0] = BIT(EV_KEY) | BIT(EV_ABS);
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input_dev->keybit[LONG(BTN_TOUCH)] = BIT(BTN_TOUCH);
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input_set_abs_params(mtouch->dev, ABS_X, MTOUCH_MIN_XC, MTOUCH_MAX_XC, 0, 0);
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|
|
input_set_abs_params(mtouch->dev, ABS_Y, MTOUCH_MIN_YC, MTOUCH_MAX_YC, 0, 0);
|
2005-04-17 02:20:36 +04:00
|
|
|
|
|
|
|
|
serio_set_drvdata(serio, mtouch);
|
|
|
|
|
|
|
|
|
|
err = serio_open(serio, drv);
|
2005-09-15 11:01:46 +04:00
|
|
|
if (err)
|
|
|
|
|
goto fail;
|
2005-04-17 02:20:36 +04:00
|
|
|
|
2005-09-15 11:01:46 +04:00
|
|
|
input_register_device(mtouch->dev);
|
2005-04-17 02:20:36 +04:00
|
|
|
|
|
|
|
|
return 0;
|
2005-09-15 11:01:46 +04:00
|
|
|
|
|
|
|
|
fail: serio_set_drvdata(serio, NULL);
|
|
|
|
|
input_free_device(input_dev);
|
|
|
|
|
kfree(mtouch);
|
|
|
|
|
return err;
|
2005-04-17 02:20:36 +04:00
|
|
|
}
|
|
|
|
|
|
|
|
|
|
/*
|
|
|
|
|
* The serio driver structure.
|
|
|
|
|
*/
|
|
|
|
|
|
|
|
|
|
static struct serio_device_id mtouch_serio_ids[] = {
|
|
|
|
|
{
|
|
|
|
|
.type = SERIO_RS232,
|
|
|
|
|
.proto = SERIO_MICROTOUCH,
|
|
|
|
|
.id = SERIO_ANY,
|
|
|
|
|
.extra = SERIO_ANY,
|
|
|
|
|
},
|
|
|
|
|
{ 0 }
|
|
|
|
|
};
|
|
|
|
|
|
|
|
|
|
MODULE_DEVICE_TABLE(serio, mtouch_serio_ids);
|
|
|
|
|
|
|
|
|
|
static struct serio_driver mtouch_drv = {
|
|
|
|
|
.driver = {
|
|
|
|
|
.name = "mtouch",
|
|
|
|
|
},
|
|
|
|
|
.description = DRIVER_DESC,
|
|
|
|
|
.id_table = mtouch_serio_ids,
|
|
|
|
|
.interrupt = mtouch_interrupt,
|
|
|
|
|
.connect = mtouch_connect,
|
|
|
|
|
.disconnect = mtouch_disconnect,
|
|
|
|
|
};
|
|
|
|
|
|
|
|
|
|
/*
|
|
|
|
|
* The functions for inserting/removing us as a module.
|
|
|
|
|
*/
|
|
|
|
|
|
|
|
|
|
static int __init mtouch_init(void)
|
|
|
|
|
{
|
|
|
|
|
serio_register_driver(&mtouch_drv);
|
|
|
|
|
return 0;
|
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
static void __exit mtouch_exit(void)
|
|
|
|
|
{
|
|
|
|
|
serio_unregister_driver(&mtouch_drv);
|
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
module_init(mtouch_init);
|
|
|
|
|
module_exit(mtouch_exit);
|
