关于Android电阻触摸屏
关于Android电阻触摸屏
/* drivers/input/touchscreen/msm_touch.c
*
* Copyright (c) 2008-2009, Code Aurora Forum. All rights reserved.
*
* This software is licensed under the terms of the GNU General Public
* License version 2, as published by the Free Software Foundation, and
* may be copied, distributed, and modified under those terms.
*
* 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.
*
*/
#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/interrupt.h>
#include <linux/input.h>
#include <linux/platform_device.h>
#include <linux/jiffies.h>
#include <linux/io.h>
#include <mach/msm_touch.h>
/* HW register map */
#define TSSC_CTL_REG 0x100
#define TSSC_SI_REG 0x108
#define TSSC_OPN_REG 0x104
#define TSSC_STATUS_REG 0x10C
#define TSSC_AVG12_REG 0x110
/* status bits */
#define TSSC_STS_OPN_SHIFT 0x6
#define TSSC_STS_OPN_BMSK 0x1C0
#define TSSC_STS_NUMSAMP_SHFT 0x1
#define TSSC_STS_NUMSAMP_BMSK 0x3E
/* CTL bits */
#define TSSC_CTL_EN (0x1 << 0)
#define TSSC_CTL_SW_RESET (0x1 << 2)
#define TSSC_CTL_MASTER_MODE (0x3 << 3)
#define TSSC_CTL_AVG_EN (0x1 << 5)
#define TSSC_CTL_DEB_EN (0x1 << 6)
#define TSSC_CTL_DEB_12_MS (0x2 << 7) /* 1.2 ms */
#define TSSC_CTL_DEB_16_MS (0x3 << 7) /* 1.6 ms */
#define TSSC_CTL_DEB_2_MS (0x4 << 7) /* 2 ms */
#define TSSC_CTL_DEB_3_MS (0x5 << 7) /* 3 ms */
#define TSSC_CTL_DEB_4_MS (0x6 << 7) /* 4 ms */
#define TSSC_CTL_DEB_6_MS (0x7 << 7) /* 6 ms */
#define TSSC_CTL_INTR_FLAG1 (0x1 << 10)
#define TSSC_CTL_DATA (0x1 << 11)
#define TSSC_CTL_SSBI_CTRL_EN (0x1 << 13)
/* control reg's default state */
#define TSSC_CTL_STATE ( \
TSSC_CTL_DEB_12_MS | \
TSSC_CTL_DEB_EN | \
TSSC_CTL_AVG_EN | \
TSSC_CTL_MASTER_MODE | \
TSSC_CTL_EN)
#define TSSC_NUMBER_OF_OPERATIONS 2
#define TS_PENUP_TIMEOUT_MS 20
#define TS_DRIVER_NAME "msm_touchscreen"
#define X_MAX 1024
#define Y_MAX 1024
#define P_MAX 256
struct ts {
struct input_dev *input;
struct timer_list timer;
int irq;
unsigned int x_max;
unsigned int y_max;
};
static void __iomem *virt;
#define TSSC_REG(reg) (virt + TSSC_##reg##_REG)
static void ts_update_pen_state(struct ts *ts, int x, int y, int pressure)
{
if (pressure) {
input_report_abs(ts->input, ABS_X, x);
input_report_abs(ts->input, ABS_Y, y);
input_report_abs(ts->input, ABS_PRESSURE, pressure);
input_report_key(ts->input, BTN_TOUCH, !!pressure);
} else {
input_report_abs(ts->input, ABS_PRESSURE, 0);
input_report_key(ts->input, BTN_TOUCH, 0);
}
input_sync(ts->input);
}
static void ts_timer(unsigned long arg)
{
struct ts *ts = (struct ts *)arg;
ts_update_pen_state(ts, 0, 0, 0);
}
static irqreturn_t ts_interrupt(int irq, void *dev_id)
{
u32 avgs, x, y, lx, ly;
u32 num_op, num_samp;
u32 status;
struct ts *ts = dev_id;
status = readl(TSSC_REG(STATUS));
avgs = readl(TSSC_REG(AVG12));
x = avgs & 0xFFFF;
y = avgs >> 16;
/* For pen down make sure that the data just read is still valid.
* The DATA bit will still be set if the ARM9 hasn't clobbered
* the TSSC. If it's not set, then it doesn't need to be cleared
* here, so just return.
*/
if (!(readl(TSSC_REG(CTL)) & TSSC_CTL_DATA))
goto out;
/* Data has been read, OK to clear the data flag */
writel(TSSC_CTL_STATE, TSSC_REG(CTL));
/* Valid samples are indicated by the sample number in the status
* register being the number of expected samples and the number of
* samples collected being zero (this check is due to ADC contention).
*/
num_op = (status & TSSC_STS_OPN_BMSK) >> TSSC_STS_OPN_SHIFT;
num_samp = (status & TSSC_STS_NUMSAMP_BMSK) >> TSSC_STS_NUMSAMP_SHFT;
if ((num_op == TSSC_NUMBER_OF_OPERATIONS) && (num_samp == 0)) {
/* TSSC can do Z axis measurment, but driver doesn't support
* this yet.
*/
/*
* REMOVE THIS:
* These x, y co-ordinates adjustments will be removed once
* Android framework adds calibration framework.
*/
#ifdef CONFIG_ANDROID_TOUCHSCREEN_MSM_HACKS
lx = ts->x_max - x;
ly = ts->y_max - y;
#else
lx = x;
ly = y;
#endif
ts_update_pen_state(ts, lx, ly, 255);
/* kick pen up timer - to make sure it expires again(!) */
mod_timer(&ts->timer,
jiffies + msecs_to_jiffies(TS_PENUP_TIMEOUT_MS));
} else
printk(KERN_INFO "Ignored interrupt: {%3d, %3d},"
" op = %3d samp = %3d\n",
x, y, num_op, num_samp);
out:
return IRQ_HANDLED;
}
static int __devinit ts_probe(struct platform_device *pdev)
{
int result;
struct input_dev *input_dev;
struct resource *res, *ioarea;
struct ts *ts;
unsigned int x_max, y_max, pressure_max;
struct msm_ts_platform_data *pdata = pdev->dev.platform_data;
/* The primary initialization of the TS Hardware
* is taken care of by the ADC code on the modem side
*/
ts = kzalloc(sizeof(struct ts), GFP_KERNEL);
input_dev = input_allocate_device();
if (!input_dev || !ts) {
result = -ENOMEM;
goto fail_alloc_mem;
}
res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
if (!res) {
dev_err(&pdev->dev, "Cannot get IORESOURCE_MEM\n");
result = -ENOENT;
goto fail_alloc_mem;
}
ts->irq = platform_get_irq(pdev, 0);
if (!ts->irq) {
dev_err(&pdev->dev, "Could not get IORESOURCE_IRQ\n");
result = -ENODEV;
goto fail_alloc_mem;
}
ioarea = request_mem_region(res->start, resource_size(res), pdev->name);
if (!ioarea) {
dev_err(&pdev->dev, "Could not allocate io region\n");
result = -EBUSY;
goto fail_alloc_mem;
}
virt = ioremap(res->start, resource_size(res));
if (!virt) {
dev_err(&pdev->dev, "Could not ioremap region\n");
result = -ENOMEM;
goto fail_ioremap;
}
input_dev->name = TS_DRIVER_NAME;
input_dev->phys = "msm_touch/input0";
input_dev->id.bustype = BUS_HOST;
input_dev->id.vendor = 0x0001;
input_dev->id.product = 0x0002;
input_dev->id.version = 0x0100;
input_dev->dev.parent = &pdev->dev;
input_dev->evbit[0] = BIT_MASK(EV_KEY) | BIT_MASK(EV_ABS);
input_dev->absbit[0] = BIT(ABS_X) | BIT(ABS_Y) | BIT(ABS_PRESSURE);
input_dev->absbit[BIT_WORD(ABS_MISC)] = BIT_MASK(ABS_MISC);
input_dev->keybit[BIT_WORD(BTN_TOUCH)] = BIT_MASK(BTN_TOUCH);
if (pdata) {
x_max = pdata->x_max ? : X_MAX;
y_max = pdata->y_max ? : Y_MAX;
pressure_max = pdata->pressure_max ? : P_MAX;
} else {
x_max = X_MAX;
y_max = Y_MAX;
pressure_max = P_MAX;
}
ts->x_max = x_max;
ts->y_max = y_max;
input_set_abs_params(input_dev, ABS_X, 0, x_max, 0, 0);
input_set_abs_params(input_dev, ABS_Y, 0, y_max, 0, 0);
input_set_abs_params(input_dev, ABS_PRESSURE, 0, pressure_max, 0, 0);
result = input_register_device(input_dev);
if (result)
goto fail_ip_reg;
ts->input = input_dev;
setup_timer(&ts->timer, ts_timer, (unsigned long)ts);
result = request_irq(ts->irq, ts_interrupt, IRQF_TRIGGER_RISING,
"touchscreen", ts);
if (result)
goto fail_req_irq;
platform_set_drvdata(pdev, ts);
return 0;
fail_req_irq:
input_unregister_device(input_dev);
input_dev = NULL;
fail_ip_reg:
iounmap(virt);
fail_ioremap:
release_mem_region(res->start, resource_size(res));
fail_alloc_mem:
input_free_device(input_dev);
kfree(ts);
return result;
}
static int __devexit ts_remove(struct platform_device *pdev)
{
struct resource *res;
struct ts *ts = platform_get_drvdata(pdev);
free_irq(ts->irq, ts);
del_timer_sync(&ts->timer);
input_unregister_device(ts->input);
iounmap(virt);
res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
release_mem_region(res->start, resource_size(res));
platform_set_drvdata(pdev, NULL);
kfree(ts);
return 0;
}
static struct platform_driver ts_driver = {
.probe = ts_probe,
.remove = __devexit_p(ts_remove),
.driver = {
.name = TS_DRIVER_NAME,
.owner = THIS_MODULE,
},
};
static int __init ts_init(void)
{
return platform_driver_register(&ts_driver);
}
module_init(ts_init);
static void __exit ts_exit(void)
{
platform_driver_unregister(&ts_driver);
}
module_exit(ts_exit);
MODULE_DESCRIPTION("MSM Touch Screen driver");
MODULE_LICENSE("GPL v2");
MODULE_ALIAS("platform:msm_touchscreen");
最近开始调试触摸屏这一块，感觉不是很难，但是很多的地方不理解，尤其是为什么按下一次panle后，会产生很多次的中断，造成上传很多的坐标值，这个在本来的触摸屏上没有什么问题，但是要是在屏上做虚拟按键的话就麻烦了。只能按照高通的虚拟键盘的机制做处理了。
但是创建成功之后，生成了键盘的配置文件，按下时还是没有反应。看到打印的log，虚拟按键的配置文件确实是有了，怎么就是没有反应呢？
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