ucb1x00-ts.c~

基于pxa270的touch screen的源码

/*
 *  linux/drivers/misc/ucb1x00-ts.c
 *
 *  Copyright (C) 2001 Russell King, All Rights Reserved.
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License version 2 as
 * published by the Free Software Foundation.
 *
 * 21-Jan-2002 <[e-mail]> :
 *
 * Added support for synchronous A/D mode. This mode is useful to
 * avoid noise induced in the touchpanel by the LCD, provided that
 * the UCB1x00 has a valid LCD sync signal routed to its ADCSYNC pin.
 * It is important to note that the signal connected to the ADCSYNC
 * pin should provide pulses even when the LCD is blanked, otherwise
 * a pen touch needed to unblank the LCD will never be read.
 */
#include <linux/config.h>
#include <linux/module.h>
#include <linux/init.h>
#include <linux/smp.h>
#include <linux/smp_lock.h>
#include <linux/sched.h>
#include <linux/completion.h>
#include <linux/delay.h>
#include <linux/string.h>
#include <linux/pm.h>

#include <asm/dma.h>
#include <asm/semaphore.h>

#include "ucb1x00.h"

/*
 * Define this if you want the UCB1x00 stuff to talk to the input layer
 */
#ifdef CONFIG_INPUT
#define USE_INPUT
#else
#undef USE_INPUT
#endif

#ifndef USE_INPUT

#include <linux/fs.h>
#include <linux/miscdevice.h>
#include <linux/poll.h>

/*
 * This structure is nonsense - millisecs is not very useful
 * since the field size is too small.  Also, we SHOULD NOT
 * be exposing jiffies to user space directly.
 */
struct ts_event {
	u16		pressure;
	u16		x;
	u16		y;
	u16		pad;
	struct timeval	stamp;
};

#define NR_EVENTS	16

#else

#include <linux/input.h>

#endif

struct ucb1x00_ts {
#ifdef USE_INPUT
	struct input_dev	idev;
#endif
	struct ucb1x00		*ucb;
#ifdef CONFIG_PM
	struct pm_dev		*pmdev;
#endif

	struct semaphore	irq_wait;
	struct semaphore	sem;
	struct completion	init_exit;
	struct task_struct	*rtask;
	int			use_count;
	u16			x_res;
	u16			y_res;

#ifndef USE_INPUT
	struct fasync_struct	*fasync;
	wait_queue_head_t	read_wait;
	u8			evt_head;
	u8			evt_tail;
	struct ts_event		events[NR_EVENTS];
#endif
	int			restart:1;
	int			adcsync:1;
};

static struct ucb1x00_ts ucbts;
static int adcsync = UCB_NOSYNC;

static int ucb1x00_ts_startup(struct ucb1x00_ts *ts);
static void ucb1x00_ts_shutdown(struct ucb1x00_ts *ts);
extern int pm_updatetimer(int);

#ifndef USE_INPUT

#define ucb1x00_ts_evt_pending(ts)	((volatile u8)(ts)->evt_head != (ts)->evt_tail)
#define ucb1x00_ts_evt_get(ts)		((ts)->events + (ts)->evt_tail)
#define ucb1x00_ts_evt_pull(ts)		((ts)->evt_tail = ((ts)->evt_tail + 1) & (NR_EVENTS - 1))
#define ucb1x00_ts_evt_clear(ts)	((ts)->evt_head = (ts)->evt_tail = 0)

static inline void ucb1x00_ts_evt_add(struct ucb1x00_ts *ts, u16 pressure, u16 x, u16 y)
{
	int next_head;

	next_head = (ts->evt_head + 1) & (NR_EVENTS - 1);
	if (next_head != ts->evt_tail) {
		ts->events[ts->evt_head].pressure = pressure;
		ts->events[ts->evt_head].x = x;
		ts->events[ts->evt_head].y = y;
		do_gettimeofday(&ts->events[ts->evt_head].stamp);
		ts->evt_head = next_head;

		if (ts->fasync)
			kill_fasync(&ts->fasync, SIGIO, POLL_IN);
		wake_up_interruptible(&ts->read_wait);
	}
}

static inline void ucb1x00_ts_event_release(struct ucb1x00_ts *ts)
{
	ucb1x00_ts_evt_add(ts, 0, 0, 0);
}

/*
 * User space driver interface.
 */
static ssize_t
ucb1x00_ts_read(struct file *filp, char *buffer, size_t count, loff_t *ppos)
{

	DECLARE_WAITQUEUE(wait, current);
	struct ucb1x00_ts *ts = filp->private_data;
	char *ptr = buffer;
	int err = 0;

	add_wait_queue(&ts->read_wait, &wait);
	while (count >= sizeof(struct ts_event)) {
		err = -ERESTARTSYS;
		if (signal_pending(current))
			break;

		if (ucb1x00_ts_evt_pending(ts)) {
			struct ts_event *evt = ucb1x00_ts_evt_get(ts);

			err = copy_to_user(ptr, evt, sizeof(struct ts_event));
			ucb1x00_ts_evt_pull(ts);

			if (err)
				break;

			ptr += sizeof(struct ts_event);
			count -= sizeof(struct ts_event);
			continue;
		}

		set_current_state(TASK_INTERRUPTIBLE);
		err = -EAGAIN;
		if (filp->f_flags & O_NONBLOCK)
			break;
		schedule();
	}
	current->state = TASK_RUNNING;
	remove_wait_queue(&ts->read_wait, &wait);
 
	return ptr == buffer ? err : ptr - buffer;
}

static unsigned int ucb1x00_ts_poll(struct file *filp, poll_table *wait)
{
	struct ucb1x00_ts *ts = filp->private_data;
	int ret = 0;

	poll_wait(filp, &ts->read_wait, wait);
	if (ucb1x00_ts_evt_pending(ts))
		ret = POLLIN | POLLRDNORM;

	return ret;
}

static int ucb1x00_ts_fasync(int fd, struct file *filp, int on)
{
	struct ucb1x00_ts *ts = filp->private_data;

	return fasync_helper(fd, filp, on, &ts->fasync);
}

static int ucb1x00_ts_open(struct inode *inode, struct file *filp)
{
	struct ucb1x00_ts *ts = &ucbts;
	int ret = 0;

	ret = ucb1x00_ts_startup(ts);
	if (ret == 0)
		filp->private_data = ts;

	return ret;
}

/*
 * Release touchscreen resources.  Disable IRQs.
 */
static int ucb1x00_ts_release(struct inode *inode, struct file *filp)
{
	struct ucb1x00_ts *ts = filp->private_data;

	down(&ts->sem);
	ucb1x00_ts_fasync(-1, filp, 0);
	ucb1x00_ts_shutdown(ts);
	up(&ts->sem);

	return 0;
}

static struct file_operations ucb1x00_fops = {
	owner:		THIS_MODULE,
	read:		ucb1x00_ts_read,
	poll:		ucb1x00_ts_poll,
	open:		ucb1x00_ts_open,
	release:	ucb1x00_ts_release,
	fasync:		ucb1x00_ts_fasync,
};

/*
 * The official UCB1x00 touchscreen is a miscdevice:
 *   10 char        Non-serial mice, misc features
 *                   14 = /dev/touchscreen/ucb1x00  UCB 1x00 touchscreen
 */
static struct miscdevice ucb1x00_ts_dev = {
	minor:	14,
	name:	"touchscreen/ucb1x00",
	fops:	&ucb1x00_fops,
};

static inline int ucb1x00_ts_register(struct ucb1x00_ts *ts)
{
	init_waitqueue_head(&ts->read_wait);
	return misc_register(&ucb1x00_ts_dev);
}

static inline void ucb1x00_ts_deregister(struct ucb1x00_ts *ts)
{
	misc_deregister(&ucb1x00_ts_dev);
}

#else

#define ucb1x00_ts_evt_clear(ts)	do { } while (0)

static inline void ucb1x00_ts_evt_add(struct ucb1x00_ts *ts, u16 pressure, u16 x, u16 y)
{
	input_report_abs(&ts->idev, ABS_X, x);
	input_report_abs(&ts->idev, ABS_Y, y);
	input_report_abs(&ts->idev, ABS_PRESSURE, pressure);
}

static inline void ucb1x00_ts_event_release(struct ucb1x00_ts *ts)
{
	input_report_abs(&ts->idev, ABS_PRESSURE, 0);
}

static int ucb1x00_ts_open(struct input_dev *idev)
{
	struct ucb1x00_ts *ts = (struct ucb1x00_ts *)idev;

	return ucb1x00_ts_startup(ts);
}

static void ucb1x00_ts_close(struct input_dev *idev)
{
	struct ucb1x00_ts *ts = (struct ucb1x00_ts *)idev;

	down(&ts->sem);
	ucb1x00_ts_shutdown(ts);
	up(&ts->sem);
}

static inline int ucb1x00_ts_register(struct ucb1x00_ts *ts)
{
	ts->idev.name      = "Touchscreen panel";
	ts->idev.idproduct = ts->ucb->id;
	ts->idev.open      = ucb1x00_ts_open;
	ts->idev.close     = ucb1x00_ts_close;

	__set_bit(EV_ABS, ts->idev.evbit);
	__set_bit(ABS_X, ts->idev.absbit);
	__set_bit(ABS_Y, ts->idev.absbit);
	__set_bit(ABS_PRESSURE, ts->idev.absbit);

	input_register_device(&ts->idev);

	return 0;
}

static inline void ucb1x00_ts_deregister(struct ucb1x00_ts *ts)
{
         input_unregister_device(&ts->idev);
}

#endif

/*
 * Switch to interrupt mode.
 */
static inline void ucb1x00_ts_mode_int(struct ucb1x00_ts *ts)
{
	if (ts->ucb->id == UCB_ID_1400_BUGGY)
		ucb1x00_reg_write(ts->ucb, UCB_TS_CR,
				UCB_TS_CR_TSMY_GND | UCB_TS_CR_TSPY_GND |
				UCB_TS_CR_MODE_INT);
	else
		ucb1x00_reg_write(ts->ucb, UCB_TS_CR,
				UCB_TS_CR_TSMX_POW | UCB_TS_CR_TSPX_POW |
				UCB_TS_CR_TSMY_GND | UCB_TS_CR_TSPY_GND |
				UCB_TS_CR_MODE_INT);
}

/*
 * Switch to pressure mode, and read pressure.  We don't need to wait
 * here, since both plates are being driven.
 */
static inline unsigned int ucb1x00_ts_read_pressure(struct ucb1x00_ts *ts)
{
	ucb1x00_reg_write(ts->ucb, UCB_TS_CR,
			UCB_TS_CR_TSMX_POW | UCB_TS_CR_TSPX_POW |
			UCB_TS_CR_TSMY_GND | UCB_TS_CR_TSPY_GND |
			UCB_TS_CR_MODE_PRES | UCB_TS_CR_BIAS_ENA);

	return ucb1x00_adc_read(ts->ucb, UCB_ADC_INP_TSPY, ts->adcsync);
}

/*
 * Switch to X position mode and measure Y plate.  We switch the plate
 * configuration in pressure mode, then switch to position mode.  This
 * gives a faster response time.  Even so, we need to wait about 55us
 * for things to stabilise.
 */
static inline unsigned int ucb1x00_ts_read_xpos(struct ucb1x00_ts *ts)
{
   int a,b,c;//bruce      
   unsigned int d;
   int n=10000;
	
	ucb1x00_reg_write(ts->ucb, UCB_TS_CR,
			UCB_TS_CR_TSMX_GND | UCB_TS_CR_TSPX_POW |
			UCB_TS_CR_MODE_PRES | UCB_TS_CR_BIAS_ENA);
	ucb1x00_reg_write(ts->ucb, UCB_TS_CR,
			UCB_TS_CR_TSMX_GND | UCB_TS_CR_TSPX_POW |
			UCB_TS_CR_MODE_PRES | UCB_TS_CR_BIAS_ENA);
	ucb1x00_reg_write(ts->ucb, UCB_TS_CR,
			UCB_TS_CR_TSMX_GND | UCB_TS_CR_TSPX_POW |
			UCB_TS_CR_MODE_POS | UCB_TS_CR_BIAS_ENA);
	udelay(55);
	//bruce
	a=ucb1x00_adc_read(ts->ucb, UCB_ADC_INP_TSPY, ts->adcsync);
	udelay(30);
	b=ucb1x00_adc_read(ts->ucb, UCB_ADC_INP_TSPY, ts->adcsync);
	udelay(30);
	c=ucb1x00_adc_read(ts->ucb, UCB_ADC_INP_TSPY, ts->adcsync);
	//d=ucb1x00_adc_read(ts->ucb, UCB_ADC_INP_TSPY, ts->adcsync);
	//printk(KERN_EMERG "a:%d\n",a);
	//printk(KERN_EMERG "b:%d\n",b);
	//printk(KERN_EMERG "c:%d\n",c);
	//printk(KERN_EMERG "d:%d\n",d);


	//while(((b-a)>2)||((b-a)<-2)){
	//a=(a+b)/2;
	//printk(KERN_EMERG "a:%d\n",a);
	//b=ucb1x00_adc_read(ts->ucb, UCB_ADC_INP_TSPY, ts->adcsync);
	//printk(KERN_EMERG "b:%d\n",b);	  
	//}
	//c=(a+b)/2;

	//while(((b-a)>1)||((b-a)<-1)){
	//a=b;
	//b=ucb1x00_adc_read(ts->ucb, UCB_ADC_INP_TSPY, ts->adcsync);	
	//printk(KERN_EMERG "b:%d\n",b);	  
	//}
	//c=b;

	while(((b-a)>4)||((b-a)<-4)||((c-a)>4)||((c-a)<-4)){
	  if(n>0){
	    n--;
	    a=b;