forked from luck/tmp_suning_uos_patched
7d12e780e0
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)
196 lines
4.1 KiB
C
196 lines
4.1 KiB
C
/*
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* Touchright serial touchscreen driver
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*
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* Copyright (c) 2006 Rick Koch <n1gp@hotmail.com>
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*
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* Based on MicroTouch driver (drivers/input/touchscreen/mtouch.c)
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* Copyright (c) 2004 Vojtech Pavlik
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* and Dan Streetman <ddstreet@ieee.org>
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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
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* by the Free Software Foundation.
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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 "Touchright serial touchscreen driver"
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MODULE_AUTHOR("Rick Koch <n1gp@hotmail.com>");
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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 TR_FORMAT_TOUCH_BIT 0x01
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#define TR_FORMAT_STATUS_BYTE 0x40
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#define TR_FORMAT_STATUS_MASK ~TR_FORMAT_TOUCH_BIT
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#define TR_LENGTH 5
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#define TR_MIN_XC 0
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#define TR_MAX_XC 0x1ff
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#define TR_MIN_YC 0
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#define TR_MAX_YC 0x1ff
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/*
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* Per-touchscreen data.
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*/
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struct tr {
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struct input_dev *dev;
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struct serio *serio;
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int idx;
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unsigned char data[TR_LENGTH];
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char phys[32];
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};
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static irqreturn_t tr_interrupt(struct serio *serio,
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unsigned char data, unsigned int flags)
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{
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struct tr *tr = serio_get_drvdata(serio);
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struct input_dev *dev = tr->dev;
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tr->data[tr->idx] = data;
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if ((tr->data[0] & TR_FORMAT_STATUS_MASK) == TR_FORMAT_STATUS_BYTE) {
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if (++tr->idx == TR_LENGTH) {
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input_report_abs(dev, ABS_X,
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(tr->data[1] << 5) | (tr->data[2] >> 1));
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input_report_abs(dev, ABS_Y,
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(tr->data[3] << 5) | (tr->data[4] >> 1));
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input_report_key(dev, BTN_TOUCH,
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tr->data[0] & TR_FORMAT_TOUCH_BIT);
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input_sync(dev);
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tr->idx = 0;
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}
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}
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return IRQ_HANDLED;
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}
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/*
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* tr_disconnect() is the opposite of tr_connect()
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*/
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static void tr_disconnect(struct serio *serio)
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{
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struct tr *tr = serio_get_drvdata(serio);
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input_get_device(tr->dev);
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input_unregister_device(tr->dev);
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serio_close(serio);
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serio_set_drvdata(serio, NULL);
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input_put_device(tr->dev);
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kfree(tr);
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}
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/*
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* tr_connect() is the routine that is called when someone adds a
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* new serio device that supports the Touchright protocol and registers it as
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* an input device.
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*/
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static int tr_connect(struct serio *serio, struct serio_driver *drv)
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{
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struct tr *tr;
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struct input_dev *input_dev;
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int err;
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tr = kzalloc(sizeof(struct tr), GFP_KERNEL);
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input_dev = input_allocate_device();
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if (!tr || !input_dev) {
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err = -ENOMEM;
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goto fail1;
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}
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tr->serio = serio;
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tr->dev = input_dev;
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snprintf(tr->phys, sizeof(tr->phys), "%s/input0", serio->phys);
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input_dev->private = tr;
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input_dev->name = "Touchright Serial TouchScreen";
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input_dev->phys = tr->phys;
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input_dev->id.bustype = BUS_RS232;
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input_dev->id.vendor = SERIO_TOUCHRIGHT;
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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(tr->dev, ABS_X, TR_MIN_XC, TR_MAX_XC, 0, 0);
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input_set_abs_params(tr->dev, ABS_Y, TR_MIN_YC, TR_MAX_YC, 0, 0);
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serio_set_drvdata(serio, tr);
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err = serio_open(serio, drv);
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if (err)
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goto fail2;
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err = input_register_device(tr->dev);
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if (err)
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goto fail3;
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return 0;
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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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kfree(tr);
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return err;
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}
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/*
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* The serio driver structure.
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*/
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static struct serio_device_id tr_serio_ids[] = {
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{
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.type = SERIO_RS232,
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.proto = SERIO_TOUCHRIGHT,
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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, tr_serio_ids);
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static struct serio_driver tr_drv = {
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.driver = {
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.name = "touchright",
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},
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.description = DRIVER_DESC,
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.id_table = tr_serio_ids,
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.interrupt = tr_interrupt,
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.connect = tr_connect,
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.disconnect = tr_disconnect,
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};
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/*
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* The functions for inserting/removing us as a module.
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*/
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static int __init tr_init(void)
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{
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serio_register_driver(&tr_drv);
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return 0;
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}
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static void __exit tr_exit(void)
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{
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serio_unregister_driver(&tr_drv);
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}
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module_init(tr_init);
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module_exit(tr_exit);
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