2019-05-20 17:07:56 +00:00
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// SPDX-License-Identifier: GPL-2.0-or-later
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2005-04-16 22:20:36 +00:00
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/*
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* Copyright (c) 2000-2001 Vojtech Pavlik
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* Copyright (c) 2000 Mark Fletcher
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*/
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/*
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* Gravis Stinger gamepad driver for Linux
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*/
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/*
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*/
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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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#define DRIVER_DESC "Gravis Stinger gamepad 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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* Constants.
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*/
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#define STINGER_MAX_LENGTH 8
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/*
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* Per-Stinger data.
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*/
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struct stinger {
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2005-09-15 07:01:52 +00:00
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struct input_dev *dev;
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2005-04-16 22:20:36 +00:00
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int idx;
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unsigned char data[STINGER_MAX_LENGTH];
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char phys[32];
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};
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/*
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* stinger_process_packet() decodes packets the driver receives from the
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* Stinger. It updates the data accordingly.
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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 13:55:46 +00:00
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static void stinger_process_packet(struct stinger *stinger)
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2005-04-16 22:20:36 +00:00
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{
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2005-09-15 07:01:52 +00:00
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struct input_dev *dev = stinger->dev;
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2005-04-16 22:20:36 +00:00
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unsigned char *data = stinger->data;
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if (!stinger->idx) return;
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input_report_key(dev, BTN_A, ((data[0] & 0x20) >> 5));
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input_report_key(dev, BTN_B, ((data[0] & 0x10) >> 4));
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input_report_key(dev, BTN_C, ((data[0] & 0x08) >> 3));
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input_report_key(dev, BTN_X, ((data[0] & 0x04) >> 2));
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input_report_key(dev, BTN_Y, ((data[3] & 0x20) >> 5));
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input_report_key(dev, BTN_Z, ((data[3] & 0x10) >> 4));
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input_report_key(dev, BTN_TL, ((data[3] & 0x08) >> 3));
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input_report_key(dev, BTN_TR, ((data[3] & 0x04) >> 2));
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input_report_key(dev, BTN_SELECT, ((data[3] & 0x02) >> 1));
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input_report_key(dev, BTN_START, (data[3] & 0x01));
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input_report_abs(dev, ABS_X, (data[1] & 0x3F) - ((data[0] & 0x01) << 6));
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input_report_abs(dev, ABS_Y, ((data[0] & 0x02) << 5) - (data[2] & 0x3F));
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input_sync(dev);
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return;
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}
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/*
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* stinger_interrupt() is called by the low level driver when characters
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* are ready for us. We then buffer them for further processing, or call the
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* packet processing routine.
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*/
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static irqreturn_t stinger_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 13:55:46 +00:00
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unsigned char data, unsigned int flags)
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2005-04-16 22:20:36 +00:00
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{
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struct stinger *stinger = serio_get_drvdata(serio);
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/* All Stinger packets are 4 bytes */
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if (stinger->idx < STINGER_MAX_LENGTH)
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stinger->data[stinger->idx++] = data;
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if (stinger->idx == 4) {
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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 13:55:46 +00:00
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stinger_process_packet(stinger);
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2005-04-16 22:20:36 +00:00
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stinger->idx = 0;
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}
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return IRQ_HANDLED;
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}
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/*
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* stinger_disconnect() is the opposite of stinger_connect()
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*/
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static void stinger_disconnect(struct serio *serio)
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{
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struct stinger *stinger = serio_get_drvdata(serio);
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serio_close(serio);
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serio_set_drvdata(serio, NULL);
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2005-09-15 07:01:52 +00:00
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input_unregister_device(stinger->dev);
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2005-04-16 22:20:36 +00:00
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kfree(stinger);
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}
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/*
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* stinger_connect() is the routine that is called when someone adds a
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* new serio device that supports Stinger protocol and registers it as
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* an input device.
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*/
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static int stinger_connect(struct serio *serio, struct serio_driver *drv)
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{
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struct stinger *stinger;
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2005-09-15 07:01:52 +00:00
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struct input_dev *input_dev;
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int err = -ENOMEM;
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2005-04-16 22:20:36 +00:00
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2005-09-15 07:01:52 +00:00
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stinger = kmalloc(sizeof(struct stinger), GFP_KERNEL);
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input_dev = input_allocate_device();
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if (!stinger || !input_dev)
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2006-11-06 03:40:09 +00:00
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goto fail1;
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2005-04-16 22:20:36 +00:00
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2005-09-15 07:01:52 +00:00
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stinger->dev = input_dev;
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2006-06-26 05:45:48 +00:00
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snprintf(stinger->phys, sizeof(stinger->phys), "%s/serio0", serio->phys);
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2005-04-16 22:20:36 +00:00
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2005-09-15 07:01:52 +00:00
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input_dev->name = "Gravis Stinger";
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input_dev->phys = stinger->phys;
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input_dev->id.bustype = BUS_RS232;
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input_dev->id.vendor = SERIO_STINGER;
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input_dev->id.product = 0x0001;
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input_dev->id.version = 0x0100;
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2007-04-12 05:35:26 +00:00
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input_dev->dev.parent = &serio->dev;
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2005-09-15 07:01:52 +00:00
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2007-10-19 06:40:32 +00:00
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input_dev->evbit[0] = BIT_MASK(EV_KEY) | BIT_MASK(EV_ABS);
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input_dev->keybit[BIT_WORD(BTN_A)] = BIT_MASK(BTN_A) | BIT_MASK(BTN_B) |
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BIT_MASK(BTN_C) | BIT_MASK(BTN_X) | BIT_MASK(BTN_Y) |
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BIT_MASK(BTN_Z) | BIT_MASK(BTN_TL) | BIT_MASK(BTN_TR) |
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BIT_MASK(BTN_START) | BIT_MASK(BTN_SELECT);
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2005-09-15 07:01:52 +00:00
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input_set_abs_params(input_dev, ABS_X, -64, 64, 0, 4);
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input_set_abs_params(input_dev, ABS_Y, -64, 64, 0, 4);
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2005-04-16 22:20:36 +00:00
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serio_set_drvdata(serio, stinger);
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err = serio_open(serio, drv);
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2005-09-15 07:01:52 +00:00
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if (err)
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2006-11-06 03:40:09 +00:00
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goto fail2;
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err = input_register_device(stinger->dev);
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if (err)
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goto fail3;
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2005-04-16 22:20:36 +00:00
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return 0;
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2005-09-15 07:01:52 +00:00
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2006-11-06 03:40:09 +00:00
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fail3: serio_close(serio);
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fail2: serio_set_drvdata(serio, NULL);
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fail1: input_free_device(input_dev);
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2005-09-15 07:01:52 +00:00
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kfree(stinger);
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return err;
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2005-04-16 22:20:36 +00:00
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}
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/*
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* The serio driver structure.
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*/
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2017-08-19 00:08:29 +00:00
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static const struct serio_device_id stinger_serio_ids[] = {
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2005-04-16 22:20:36 +00:00
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{
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.type = SERIO_RS232,
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.proto = SERIO_STINGER,
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.id = SERIO_ANY,
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.extra = SERIO_ANY,
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},
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{ 0 }
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};
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MODULE_DEVICE_TABLE(serio, stinger_serio_ids);
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static struct serio_driver stinger_drv = {
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.driver = {
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.name = "stinger",
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},
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.description = DRIVER_DESC,
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.id_table = stinger_serio_ids,
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.interrupt = stinger_interrupt,
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.connect = stinger_connect,
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.disconnect = stinger_disconnect,
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};
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2012-04-04 06:50:17 +00:00
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module_serio_driver(stinger_drv);
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