管理提醒: 本帖被 xoom 执行加亮操作(2013-08-14)
Tiny210v2上没有四线电阻屏的接口,可直接从核心板上引出四根线连接至四线电阻屏,下面为四线电阻屏的驱动源码,我已经在Tiny210v2上测试OK。有兴趣的朋友可以看看。
#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/slab.h>
#include <linux/input.h>
#include <linux/init.h>
#include <linux/errno.h>
#include <linux/serio.h>
#include <linux/delay.h>
#include <linux/clk.h>
#include <linux/wait.h>
#include <linux/sched.h>
#include <linux/cdev.h>
#include <linux/miscdevice.h>
#include <asm/io.h>
#include <asm/irq.h>
#include <asm/uaccess.h>
#include <mach/map.h>
#include <mach/regs-clock.h>
#include <mach/regs-adc.h>
#include <mach/regs-gpio.h>
#include <plat/regs-timer.h>
struct tiny210_ts_regs{
unsigned long tsadccon1;
unsigned long tscon1;
unsigned long tsdly1;
unsigned long tsdatx1;
unsigned long tsdaty1;
unsigned long tspenstat1;
unsigned long clrintadc1;
unsigned long noregs;
unsigned long clrintpen1;
};
struct tiny210_ts_regs_1{
unsigned long tsadccon0;
unsigned long tscon0;
unsigned long tsdly0;
unsigned long tsdatx0;
unsigned long tsdaty0;
unsigned long tspenstat0;
unsigned long clrintadc0;
unsigned long adcmux;
unsigned long clrintpen0;
};
static struct input_dev *tiny210_ts_dev;
static volatile struct tiny210_ts_regs *tiny210_ts_regs;
static volatile struct tiny210_ts_regs_1*tiny210_ts_regs_1;
static struct timer_list ts_timer;
static void enter_wait_pen_down_mode(void)
{
tiny210_ts_regs->tscon1 = 0xd3;
}
static void enter_wait_pen_up_mode(void)
{
tiny210_ts_regs->tscon1 = 0x1d3;
}
static void enter_measure_xy_mode(void)
{
tiny210_ts_regs->tscon1 = (1<<3) | (1<<2);
}
static void start_adc(void)
{
tiny210_ts_regs->tsadccon1 |= (1<<0);
}
static int tiny210_filter_ts(int x[], int y[])
{
#define ERR_LIMIT 50
int avr_x, avr_y;
int det_x, det_y;
avr_x = (x[0]+x[1])/2;
avr_y = (y[0]+y[1])/2;
det_x = (x[2] > avr_x) ? (x[2] - avr_x) : (avr_x - x[2]);
det_y = (y[2] > avr_y) ? (y[2] - avr_y) : (avr_y - y[2]);
if((det_x > ERR_LIMIT) || (det_y > ERR_LIMIT))
return 0;
avr_x = (x[1] + x[2])/2;
avr_y = (y[1] + y[2])/2;
det_x = (x[3] > avr_x) ? (x[3] - avr_x) : (avr_x - x[3]);
det_y = (y[3] > avr_y) ? (y[3] - avr_y) : (avr_y - y[3]);
if((det_x > ERR_LIMIT) || (det_y > ERR_LIMIT))
return 0;
return 1;
}
static void tiny210_ts_timer_function(unsigned long data)
{
if(tiny210_ts_regs->tsdatx1 & (1<<15))
{
input_report_abs(tiny210_ts_dev, ABS_PRESSURE, 0);
input_report_key(tiny210_ts_dev, BTN_TOUCH, 0);
input_sync(tiny210_ts_dev);
enter_wait_pen_down_mode();
}
else
{
enter_measure_xy_mode();
start_adc();
}
}
static irqreturn_t adc_irq(int irq, void *dev_id)
{
tiny210_ts_regs->clrintadc1 = 0;
static int cnt = 0;
static int x[4], y[4];
int adcdatx,adcdaty;
adcdatx = tiny210_ts_regs->tsdatx1;
adcdaty = tiny210_ts_regs->tsdaty1;
if(tiny210_ts_regs->tsdatx1 & (1<<15))
{
cnt = 0;
input_report_abs(tiny210_ts_dev, ABS_PRESSURE, 0);
input_report_key(tiny210_ts_dev, BTN_TOUCH, 0);
input_sync(tiny210_ts_dev);
enter_wait_pen_down_mode();
}
else
{
//printk("adc_irq cnt = %d, x = %d, y = %d\n",++cnt,adcdatx & 0xfff, adcdaty & 0xfff);
x[cnt] = adcdatx & 0xfff;
y[cnt] = adcdaty & 0xfff;
++cnt;
if(cnt == 4)
{
if(tiny210_filter_ts(x,y))
{
//printk("x = %d, y = %d\n",(x[0]+x[1]+x[2]+x[3])/4, (y[0]+y[1]+y[2]+y[3])/4);
input_report_abs(tiny210_ts_dev, ABS_X, (x[0]+x[1]+x[2]+x[3])/4);
input_report_abs(tiny210_ts_dev, ABS_Y, (y[0]+y[1]+y[2]+y[3])/4);
input_report_abs(tiny210_ts_dev, ABS_PRESSURE, 1);
input_report_key(tiny210_ts_dev, BTN_TOUCH, 1);
input_sync(tiny210_ts_dev);
}
cnt = 0;
enter_wait_pen_up_mode();
}
else
{
enter_measure_xy_mode();
start_adc();
}
}
return IRQ_HANDLED;
}
static irqreturn_t pen_down_up_irq(int irq, void *dev_id)
{
tiny210_ts_regs->clrintpen1 = 0;
if(tiny210_ts_regs->tsdatx1 & (1<<15))
{
//printk("pen up\n");
input_report_abs(tiny210_ts_dev, ABS_PRESSURE, 0);
input_report_key(tiny210_ts_dev, BTN_TOUCH, 0);
input_sync(tiny210_ts_dev);
enter_wait_pen_down_mode();
}
else
{
//printk("pen down\n");
//enter_wait_pen_up_mode();
enter_measure_xy_mode();
start_adc();
}
return IRQ_HANDLED;
}
static int tiny210_ts_init(void)
{
struct clk* clk;
tiny210_ts_dev = input_allocate_device();
set_bit(EV_KEY, tiny210_ts_dev->evbit);
set_bit(EV_ABS, tiny210_ts_dev->evbit);
set_bit(BTN_TOUCH, tiny210_ts_dev->keybit);
input_set_abs_params(tiny210_ts_dev, ABS_X, 0, 0xfff, 0, 0);
input_set_abs_params(tiny210_ts_dev, ABS_Y, 0, 0xfff, 0, 0);
input_set_abs_params(tiny210_ts_dev, ABS_PRESSURE, 0, 1, 0, 0);
input_register_device(tiny210_ts_dev);
tiny210_ts_regs_1= ioremap(0xE1700000, sizeof(struct tiny210_ts_regs_1));
tiny210_ts_regs = ioremap(0xE1701000,sizeof(struct tiny210_ts_regs));
clk = clk_get(NULL, "adc");
clk_enable(clk);
tiny210_ts_regs_1->tsadccon0 |= (1<<17);
tiny210_ts_regs->tsadccon1 &= ~(1<<2);
tiny210_ts_regs->tsadccon1 = (1<<14) | (1<<16) |(65<<6);
request_irq(IRQ_PENDN1, pen_down_up_irq, IRQF_SAMPLE_RANDOM, "ts_pen", NULL);
request_irq(IRQ_ADC1, adc_irq, IRQF_SAMPLE_RANDOM, "adc", NULL);
tiny210_ts_regs->tsdly1 = 0xffff;
init_timer(&ts_timer);
ts_timer.function = tiny210_ts_timer_function;
add_timer(&ts_timer);
enter_wait_pen_down_mode();
return 0;
}
static void tiny210_ts_exit(void)
{
input_unregister_device(tiny210_ts_dev);
input_free_device(tiny210_ts_dev);
iounmap(tiny210_ts_regs);
iounmap(tiny210_ts_regs_1);
free_irq(IRQ_PENDN1, NULL);
free_irq(IRQ_ADC1, NULL);
del_timer(&ts_timer);
}
module_init(tiny210_ts_init);
module_exit(tiny210_ts_exit);
MODULE_AUTHOR("jany_linux");
MODULE_LICENSE("GPL");