Tiny6410移植tslib
一、将Tiny6410一线触摸程序改成输入设备(input device)
由于友善一线触摸下位机不开源，所以只能在官方提供的内核模块上进行修改。
官方源代码：http://pan.baidu.com/s/1bog4rZD
1、修改模块加载函数
1 static int __init dev_init(void)
2 {
3 int ret;
4 #ifdef TS_INPUT_DRIVER
5 /* alloc input system device */
6 ts.input = input_allocate_device();
7
8 ts.input->evbit[0] = BIT_MASK(EV_KEY) | BIT_MASK(EV_ABS);
9 ts.input->keybit[BIT_WORD(BTN_TOUCH)] = BIT_MASK(BTN_TOUCH);
10
11 input_set_abs_params(ts.input, ABS_X, 0, 0xFFFF, 0, 0);
12 input_set_abs_params(ts.input, ABS_Y, 0, 0xFFFF, 0, 0);
13
14 ts.input->name = 'Tiny6410 TouchScreen';
15 ts.input->id.bustype = BUS_HOST;
16 ts.input->id.vendor = 0xDEAD;
17 ts.input->id.product = 0xBEEF;
18 ts.input->id.version = 0x0102;
19
20
21 set_pin_up();
22 set_pin_value(1);
23 set_pin_as_output();
24 setup_irq(IRQ_TIMER3, &timer_for_1wire_irq);
25 ret = init_timer_for_1wire();
26 if(ret < 0)
27 {
28 printk(TOUCH_DEVICE_NAME'timer init failedn');
29 goto timer_err;
30 }
31 init_timer(&one_wire_timer);
32 one_wire_timer_proc(0);
33 create_proc_read_entry('driver/one-wire-info', 0, NULL, read_proc, NULL);
34
35 /* register to the input system */
36 ret = input_register_device(ts.input);
37 if(ret < 0)
38 {
39 printk(TOUCH_DEVICE_NAME'failed to register input devicen');
40 goto timer_err;
41 }
42
43 return 0;
44 timer_err:
45 free_irq(IRQ_TIMER3, &timer_for_1wire_irq);
46
47 #else
48
49 ret = misc_register(&ts_misc) | misc_register(&bl_misc) ;
50 set_pin_up();
51 set_pin_value(1);
52 set_pin_as_output();
53
54 if (ret == 0) {
55 setup_irq(IRQ_TIMER3, &timer_for_1wire_irq);
56 ret = init_timer_for_1wire();
57 init_timer(&one_wire_timer);
58 one_wire_timer_proc(0);
59 create_proc_read_entry('driver/one-wire-info', 0, NULL, read_proc, NULL);
60 }
61
62 if (ret == 0) {
63 printk (TOUCH_DEVICE_NAME'tinitializedn');
64 printk (BACKLIGHT_DEVICE_NAME'tinitializedn');
65 }
66 #endif
67
68 return ret;
69 }
在这个函数中提交输入的事件EV_KEY、EV_ABS、BTN_TOUCH，并注册输入设备到系统。
2、向输入子系统报告输入事件
修改源代码notify_ts_data()函数：
1 static inline void notify_ts_data(unsigned x, unsigned y, unsigned down)
2 {
3 if (!down && !(ts_status &(1U << 31))) {
4 // up repeat, give it up
5 #ifdef TS_INPUT_DRIVER
6 input_report_key(ts.input, BTN_TOUCH, 0);
7 input_sync(ts.input);
8 #endif
9 return;
10 }
11 #ifdef TS_INPUT_DRIVER
12 ts.xp = x;
13 ts.yp = y;
14 //printk('ts.xp = %ld,ts.yp = %ldn',ts.xp,ts.yp);
15 input_report_abs(ts.input, ABS_X, ts.xp);
16 input_report_abs(ts.input, ABS_Y, ts.yp);
17
18 input_report_key(ts.input, BTN_TOUCH, 1);
19 input_sync(ts.input);
20 #else
21 ts_status = ((x << 16) | (y)) | (down << 31);
22 ts_ready = 1;
23 wake_up_interruptible(&ts_waitq);
24 #endif
25 }
这个函数在按键按下时向输入子系统报告X/Y轴坐标的AD值和按键按下标志，在按键释放时报告按键释放标志。
3、修改模块卸载函数
1 static void __exit dev_exit(void)
2 {
3 exitting = 1;
4 #ifdef TS_INPUT_DRIVER
5 input_unregister_device(ts.input);
6 #endif
7 remove_proc_entry('driver/one-wire-info', NULL);
8 del_timer_sync(&one_wire_timer);
9 free_irq(IRQ_TIMER3, &timer_for_1wire_irq);
10 #ifndef TS_INPUT_DRIVER
11 misc_deregister(&ts_misc);
12 misc_deregister(&bl_misc);
13 #endif
14 }
在模块卸载函数中卸载输入设备。
二、移植tslib到开发板
tslib源码下载：http://pan.baidu.com/s/1qXuqPdU
编译工具：arm-linux-gcc
1、下载源码并解压
tar xzbf tslib-1.4.tar.gz
2、修改源码
打开源码tslib/plugins/input-raw.c文件
首先修改check_fd()函数，由于设备驱动没有用到ioctl，所以这个检测函数直接返回0。但是设备驱动用到了同步所以要把using_syn = 1:
1 static int check_fd(struct tslib_input *i)
2 {
3 struct tsdev *ts = i->module.dev;
4 int version;
5 u_int32_t bit;
6 u_int64_t absbit;
7 /*
8 if (! ((ioctl(ts->fd, EVIOCGVERSION, &version) >= 0) &&
9 (version == EV_VERSION) &&
10 (ioctl(ts->fd, EVIOCGBIT(0, sizeof(bit) * 8), &bit) >= 0) &&
11 (bit & (1 << EV_ABS)) &&
12 (ioctl(ts->fd, EVIOCGBIT(EV_ABS, sizeof(absbit) * 8), &absbit) >= 0) &&
13 (absbit & (1 << ABS_X)) &&
14 (absbit & (1 << ABS_Y)) && (absbit & (1 << ABS_PRESSURE)))) {
15 fprintf(stderr, 'selected device is not a touchscreen I understandn');
16 return -1;
17 }
18 */
19 printf('selected device!n');
20 //if (bit & (1 << EV_SYN))
21 i->using_syn = 1;
22
23 return 0;
24 }
修改ts_input_read()函数，根据设备驱动程序可以知道，设备驱动提交BTN_TOUCH表示触摸屏有无按下，且设备驱动没有提交ABS_PRESSURE
1 static int ts_input_read(struct tslib_module_info *inf,
2 struct ts_sample *samp, int nr)
3 {
4 struct tslib_input *i = (struct tslib_input *)inf;
5 struct tsdev *ts = inf->dev;
6 struct input_event ev;
7 int ret = nr;
8 int total = 0;
9
10 if (i->sane_fd == 0)
11 i->sane_fd = check_fd(i);
12
13 if (i->sane_fd == -1)
14 return 0;
15
16 if (i->using_syn) {
17 while (total < nr)
18 {
19 ret = read(ts->fd, &ev, sizeof(struct input_event));
20 if (ret < (int)sizeof(struct input_event)) {
21 total = -1;
22 break;
23 }
24 switch (ev.type)
25 {
26 case EV_KEY:
27 switch (ev.code)
28 {
29 case BTN_TOUCH:
30 if (ev.value == 0)
31 {
32 /* pen up */
33 samp->x = 0;
34 samp->y = 0;
35 //samp->pressure = 0;
36 i->current_p = 0;
37 samp->tv = ev.time;
38 //samp++;
39 //total++;
40 printf('key_upn');
41 }
42 else if(ev.value == 1)
43 {
44 i->current_p = 1;
45 printf('key_downn');
46 }
47 break;