hi_touchscreen.c

嵌入式linux系统下hi3510平台的osd开发源码

/* 
 * extdrv/peripheral/touchscreenpad/touchscreenpad_iptv.c
 *
 * Copyright (c) 2006 Hisilicon Co., Ltd. 
 *
 * 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
 *
 * 
 * History: 
 *      10-April-2006 create this file
 *		27-06-2006 modified by y36721
 */



#include <linux/config.h>
#include <linux/module.h>
#include <linux/moduleparam.h>
#include <linux/types.h>
#include <linux/kernel.h>
#include <linux/fs.h>
#include <linux/init.h>
#include <linux/sched.h>
#include <linux/delay.h>
#include <linux/string.h>
#include <linux/poll.h>
#include <linux/interrupt.h>
#include <linux/timer.h>
#include <linux/miscdevice.h>

#include <asm/hardware.h>
#include <asm/irq.h>
#include <asm/uaccess.h>
#include <asm/io.h>

#include "hi_gpio.h"
#include "hi_touchScreen.h"


static int open_cnt = 0;


unsigned short  u16XPosition;
unsigned short  u16YPosition;
int 		   begain=0,end=0,difference = 0;

unsigned int ts_rx_buf[BUFSIZE];

int ts_rx_head=-1;
int ts_rx_tail=-1;
int ready=0;

int watch_dog=0;

static struct   	timer_list delay_timer;	
static struct   	timer_list cycle_timer;	

#define DELAY(x) time_delay_us(x)
static unsigned short gpio_send_command(unsigned char);
static inline void time_delay_us(unsigned int );
static unsigned short touchscreen_ready(void);
static unsigned short touchscreen_readx(void);
static  DECLARE_WAIT_QUEUE_HEAD(touchscreen_wait);

/* 
 *	initialize gpio configure
 */
static void gpio_init(void)
{
    	/* set gpio_0 dir: in 5,6, 2 ;out 1,3,4*/
      gpio_dirsetbit(SPICLK_G , SPICLK_B ,DIRECTION_OUTPUT);    	
      gpio_dirsetbit(SPICSN_G , SPICSN_B ,DIRECTION_OUTPUT);      	
      gpio_dirsetbit(SPIDI_G , SPIDI_B ,DIRECTION_OUTPUT);  
      gpio_dirsetbit(SPIIRQ_G , SPIIRQ_B ,DIRECTION_INPUT);      
      gpio_dirsetbit(SPIBUSY_G , SPIBUSY_B ,DIRECTION_INPUT);        
      gpio_dirsetbit(SPIDO_G , SPIDO_B ,DIRECTION_INPUT);  
 
  	
      /* disable gpio_0_5 interrupt */ 
      gpio_interruptdisable (SPIIRQ_G ,SPIIRQ_B);  
    	/* set gpio_0 interrupt mode */

    	gpio_interruptset(
                      		SPIIRQ_G, 
                      		SPIIRQ_B, 
                      		SENSE_SINGLE, 
                      		SENSE_EDGE, 
                      		EVENT_FALLING_EDGE
                        );

    	/* clear the int_flags of gpio_0_7 */

    	gpio_interruptclear(SPIIRQ_G, SPIIRQ_B);
      gpio_interruptenable(SPIIRQ_G, SPIIRQ_B);   	
    	
     	  
      /*enable CS*/
      gpio_writebit(SPICLK_G,SPICLK_B,0);  
      gpio_writebit(SPIDI_G,SPIDI_B,0);      
      gpio_writebit(SPICSN_G,SPICSN_B,0);    

}


static inline void time_delay_us(unsigned int d200nsec)
{
	int i,j;
	
	for(i=0;i<d200nsec ;i++)
	{
     for(j=0;j<10;j++)
     {
     }
	}
}

static unsigned short gpio_send_command(unsigned char command)
{
	 unsigned short tmp;
	 static char map[8];
	 int i; 
	 static unsigned short map_r[16];
	 
	 
	 for(i=0;i<8;i++)
	 {
	 	 tmp = command;
	 	 tmp = (tmp >> (7-i)) & 0x01;
	 	 map[i] = tmp;
	 }
	 	 /*CLK low*/

	 	 /*CLK low*/
     gpio_writebit(SPICLK_G,SPICLK_B,0);	
     /*send data*/
     gpio_writebit(SPIDI_G,SPIDI_B,map[0]); 	
     /*delay min 100ns*/ 
     DELAY(1);        
	 	 /*CLK high*/
     gpio_writebit(SPICLK_G,SPICLK_B,1);	     
     /*delay min 10ns*/
     DELAY(1);

     gpio_writebit(SPICLK_G,SPICLK_B,0);	
     /*send data*/
     gpio_writebit(SPIDI_G,SPIDI_B,map[1]); 	
     /*delay min 100ns*/ 
     DELAY(1);        
	 	 /*CLK high*/
     gpio_writebit(SPICLK_G,SPICLK_B,1);	     
     /*delay min 10ns*/
     DELAY(1);

     gpio_writebit(SPICLK_G,SPICLK_B,0);	
     /*send data*/
     gpio_writebit(SPIDI_G,SPIDI_B,map[2]); 	
     /*delay min 100ns*/ 
     DELAY(1);        
	 	 /*CLK high*/
     gpio_writebit(SPICLK_G,SPICLK_B,1);	     
     /*delay min 10ns*/
     DELAY(1);

     gpio_writebit(SPICLK_G,SPICLK_B,0);	
     /*send data*/
     gpio_writebit(SPIDI_G,SPIDI_B,map[3]); 	
     /*delay min 100ns*/ 
     DELAY(1);        
	 	 /*CLK high*/
     gpio_writebit(SPICLK_G,SPICLK_B,1);	     
     /*delay min 10ns*/
     DELAY(1);
   
   
     gpio_writebit(SPICLK_G,SPICLK_B,0);	
     /*send data*/
     gpio_writebit(SPIDI_G,SPIDI_B,map[4]);	
     /*delay min 100ns*/ 
     DELAY(1);        
	 	 /*CLK high*/
     gpio_writebit(SPICLK_G,SPICLK_B,1);	     
     /*delay min 10ns*/
     DELAY(1);   
   
     gpio_writebit(SPICLK_G,SPICLK_B,0);	
     /*send data*/
     gpio_writebit(SPIDI_G,SPIDI_B,map[5]); 	
     /*delay min 100ns*/ 
     DELAY(1);        
	 	 /*CLK high*/
     gpio_writebit(SPICLK_G,SPICLK_B,1);	     
     /*delay min 10ns*/
     DELAY(1);  
     
     gpio_writebit(SPICLK_G,SPICLK_B,0);	
     /*send data*/
     gpio_writebit(SPIDI_G,SPIDI_B,map[6]); 	
     /*delay min 100ns*/ 
     DELAY(1);        
	 	 /*CLK high*/
     gpio_writebit(SPICLK_G,SPICLK_B,1);	     
     /*delay min 10ns*/
     DELAY(1);       
     
     
     gpio_writebit(SPICLK_G,SPICLK_B,0);	
     /*send data*/
     gpio_writebit(SPIDI_G,SPIDI_B,map[7]); 	
     /*delay min 100ns*/ 
     DELAY(1);        
	 	 /*CLK high*/
     gpio_writebit(SPICLK_G,SPICLK_B,1);	     
     /*delay min 10ns*/
     DELAY(1);  
     
 
	 	 /*CLK low*/
     gpio_writebit(SPICLK_G,SPICLK_B,0);
     /*delay min 100ns*/ 
     DELAY(1);  
     /*CLK high*/
     gpio_writebit(SPICLK_G,SPICLK_B,1);            
     /*delay min 10ns*/
     DELAY(1);   
     
	 	 /*CLK low*/
     gpio_writebit(SPICLK_G,SPICLK_B,0);
     /*delay min 100ns*/ 
     DELAY(1);    

     /*CLK high*/
     gpio_writebit(SPICLK_G,SPICLK_B,1);
     map_r[0]=*((volatile unsigned char *)IO_ADDRESS(SPIDO));
     DELAY(1); 
	 	 /*CLK low*/
     gpio_writebit(SPICLK_G,SPICLK_B,0);
     /*delay min 100ns*/ 
     DELAY(1);              
     
     gpio_writebit(SPICLK_G,SPICLK_B,1);
     map_r[1]=*((volatile unsigned char *)IO_ADDRESS(SPIDO));
     DELAY(1); 
	 	 /*CLK low*/
     gpio_writebit(SPICLK_G,SPICLK_B,0);
     /*delay min 100ns*/ 
     DELAY(1);   
     
     gpio_writebit(SPICLK_G,SPICLK_B,1);
      map_r[2]=*((volatile unsigned char *)IO_ADDRESS(SPIDO));
     DELAY(1); 
	 	 /*CLK low*/
     gpio_writebit(SPICLK_G,SPICLK_B,0);
     /*delay min 100ns*/ 
     DELAY(1);        
     
     gpio_writebit(SPICLK_G,SPICLK_B,1);
     map_r[3]=*((volatile unsigned char *)IO_ADDRESS(SPIDO));
     DELAY(1); 
	 	 /*CLK low*/
     gpio_writebit(SPICLK_G,SPICLK_B,0);
     /*delay min 100ns*/ 
     DELAY(1);             
     
     
     gpio_writebit(SPICLK_G,SPICLK_B,1);
     map_r[4]=*((volatile unsigned char *)IO_ADDRESS(SPIDO));
     DELAY(1); 
	 	 /*CLK low*/
     gpio_writebit(SPICLK_G,SPICLK_B,0);
     /*delay min 100ns*/ 
     DELAY(1);      
     
  
     gpio_writebit(SPICLK_G,SPICLK_B,1); 
      map_r[5]=*((volatile unsigned char *)IO_ADDRESS(SPIDO));
     DELAY(1); 
	 	 /*CLK low*/
     gpio_writebit(SPICLK_G,SPICLK_B,0);
     /*delay min 100ns*/ 
     DELAY(1);        
  
  
     gpio_writebit(SPICLK_G,SPICLK_B,1);
      map_r[6]=*((volatile unsigned char *)IO_ADDRESS(SPIDO));
     DELAY(1); 
	 	 /*CLK low*/
     gpio_writebit(SPICLK_G,SPICLK_B,0);
     /*delay min 100ns*/ 
     DELAY(1);       
  
  
     gpio_writebit(SPICLK_G,SPICLK_B,1);
      map_r[7]=*((volatile unsigned char *)IO_ADDRESS(SPIDO));
     DELAY(1); 
	 	 /*CLK low*/
     gpio_writebit(SPICLK_G,SPICLK_B,0);
     /*delay min 100ns*/ 
     DELAY(1);         
  
  
     gpio_writebit(SPICLK_G,SPICLK_B,1);
     map_r[8]=*((volatile unsigned char *)IO_ADDRESS(SPIDO));
     DELAY(1); 
	 	 /*CLK low*/
     gpio_writebit(SPICLK_G,SPICLK_B,0);
     /*delay min 100ns*/ 
     DELAY(1);         
  
  
     gpio_writebit(SPICLK_G,SPICLK_B,1);
     map_r[9]=*((volatile unsigned char *)IO_ADDRESS(SPIDO));
     DELAY(1); 
	 	 /*CLK low*/
     gpio_writebit(SPICLK_G,SPICLK_B,0);
     /*delay min 100ns*/ 
     DELAY(1);        
  
     gpio_writebit(SPICLK_G,SPICLK_B,1);
      map_r[10]=*((volatile unsigned char *)IO_ADDRESS(SPIDO)); 
     DELAY(1); 
	 	 /*CLK low*/
     gpio_writebit(SPICLK_G,SPICLK_B,0);
     /*delay min 100ns*/ 
     DELAY(1);          
     
     
     gpio_writebit(SPICLK_G,SPICLK_B,1);
      map_r[11]=*((volatile unsigned char *)IO_ADDRESS(SPIDO));
     DELAY(1); 
	 	 /*CLK low*/
     gpio_writebit(SPICLK_G,SPICLK_B,0);
     /*delay min 100ns*/ 
     DELAY(1);    
     

   
   tmp = 0;
	 for(i=0;i<12;i++)
	 {
	 	 tmp = tmp | (map_r[i]<<(11-i));	
	 }   

   return(tmp);
  
}


static unsigned short touchscreen_readx(void)
{
 	/* Make sure write buffer is free. */
  	unsigned char command;  	 
  	unsigned short data=0;

  	/* Write out the control data. */
  	command = 0xD0;
    data = gpio_send_command(command);     

  	return(data);
}

static unsigned short touchscreen_ready(void)
{
  	/* Make sure write buffer is free. */
  	unsigned char command;  	 
  	unsigned short data = 0;

  	/* Write out the control data. */
  	command = 0x90;
    data = gpio_send_command(command); 

  	return(data);
}

/*
 *	interrupt handle and start time_list
 *      Do not to modify the input parameter!
 */
static irqreturn_t hi_touchscreen_irq(int irq, void *dev_id, struct pt_regs *reg)
{
    	int handled = 0;
    	unsigned char tmp;
    	
    	begain = jiffies;  
      tmp=*((volatile unsigned char *)IO_ADDRESS(SPIIRQ_RIS));     	  	
      tmp = tmp & (1<<SPIIRQ_B);
      if(tmp)
      {
	      gpio_interruptdisable (SPIIRQ_G ,SPIIRQ_B);  
	
	    	delay_timer.expires = jiffies + margin;
	    	add_timer (&delay_timer);
      }
    	handled = 1;
    	return IRQ_RETVAL(handled);
}



static int get_position(unsigned long data)
{	  
		u16XPosition = touchscreen_readx();
  	u16YPosition = touchscreen_ready();

		ts_rx_buf[ts_rx_head]=u16XPosition;		
		ts_rx_head++;
		ts_rx_buf[ts_rx_head]=u16YPosition;
		ts_rx_head++;

		if(ts_rx_head>=BUFSIZE)
		{
			ts_rx_head = 0;
		}
		cycle_timer.expires = jiffies + 2*margin;
		add_timer(&cycle_timer);
		ready = 1;
		wake_up_interruptible(&touchscreen_wait);  
		
	return 0;	
}

	
static int read_position(void)
{
		unsigned int up;   		
	  gpio_readbit(SPIIRQ_G,SPIIRQ_B,&up); 
	  if(!up)
	  {
		  u16XPosition = touchscreen_readx();
	    u16YPosition = touchscreen_ready();

			ts_rx_buf[ts_rx_head]=u16XPosition;
			ts_rx_head++;
			ts_rx_buf[ts_rx_head]=u16YPosition;
			ts_rx_head++;
			if(ts_rx_head>=BUFSIZE)
			{
				ts_rx_head = 0 ;
			}
			ready = 1;
			wake_up_interruptible(&touchscreen_wait);   
	
		  cycle_timer.expires = jiffies + 2*margin;
			add_timer(&cycle_timer);
	  }
	  else
	  {
      gpio_interruptclear(SPIIRQ_G, SPIIRQ_B);
      gpio_interruptenable(SPIIRQ_G, SPIIRQ_B); 	  	
	  }
	  return 0;
}
	
	
static int hi_touchscreen_open(struct inode *inode ,struct file *file)
{
	 int ret;
	 
	 if(!open_cnt)
	 	{
    	gpio_init();
    	
      ret = request_irq(Irq_0, &hi_touchscreen_irq, 0, TOUCHSCREEN_DEVICE_NAME, NULL); 
    	if(ret<0)
    	{    		
    		printk(TOUCHSCREEN_DEVICE_NAME " can't request irq(%d)\n",Irq_0);
    		return ret;
    	}     	  	

    	ts_rx_head = 0;
    	ts_rx_tail = 0;
    	ready = 0;
    	watch_dog = 0;
    	
    }
    open_cnt++;
    return 0;
}

static int hi_touchscreen_close(struct inode *inode ,struct file *file)
{
	open_cnt--;
	return 0;
}


/*
 *	read touchscreen_value buf. 
 */
static int hi_touchscreen_read(struct file * file, char * buffer, size_t count, loff_t *ppos) 
{ 
    	int *user_buf = (int *)buffer;
retry:
    	if (ready)
    	{

        	copy_to_user(user_buf, (int *)(&ts_rx_buf[ts_rx_tail]), sizeof(int));
        	if(++ts_rx_tail>=BUFSIZE)
        		 ts_rx_tail =0;
        		
        	count = sizeof(char);
        	if(ts_rx_tail == ts_rx_head)
        		ready = 0;
        	return count;
        	
    	}
    	else
    	{
        	if((file->f_flags & O_NONBLOCK) == O_NONBLOCK)
        		return -EAGAIN;
        	interruptible_sleep_on(&touchscreen_wait);
        	goto retry;
    	}
}	
	

 
static struct file_operations hi_touchscreen_fops =
{ 
    	owner:    THIS_MODULE, 
    	open :    hi_touchscreen_open,
    	release:  hi_touchscreen_close,
    	read:     hi_touchscreen_read,
}; 

static struct miscdevice hi_touchscreen_miscdev =
{
	.minor		= MISC_DYNAMIC_MINOR,
	.name		= TOUCHSCREEN_DEVICE_NAME,
	.fops		= &hi_touchscreen_fops,
};
   
static int __init hi_touchscreen_init(void)
{ 
	  int ret;
    ret = misc_register(&hi_touchscreen_miscdev);
    if (ret < 0) 
    { 
       	printk(TOUCHSCREEN_DEVICE_NAME "can't register!\n"); 
       	return ret; 
    } 
     
  
    gpio_remap();
    gpio_init();     
    
  	init_waitqueue_head(&touchscreen_wait);
  	init_timer(&delay_timer);
  	init_timer(&cycle_timer);
  	delay_timer.function = (void *)get_position;
  	cycle_timer.function = (void *)read_position;
  	
  	printk("Hi35**  Touchscreen Device Driver v1.0\n");  	
  	
  	return 0;
} 


static void __exit hi_touchscreen_exit(void) 
{     
      del_timer(&delay_timer);
      del_timer(&cycle_timer);	
    	free_irq(Irq_0,NULL);
	    misc_deregister(&hi_touchscreen_miscdev);
	    gpio_unmap();
}


module_init(hi_touchscreen_init);
module_exit(hi_touchscreen_exit);
MODULE_LICENSE("GPL");