Reprint: linux2.6.37.4 Core on XC2440 Development Board porting (vi) touch screen drive porting

from: http://blog.chinaunix.net/uid-22030783-id-3023527.htmlThe kernel comes with s3c2440 touch-screen controller driver, which is the driver of input subsystem, the touch screen driver needs the support of ADC driver, the touch screen driver file is: DRIVERS/INPUT/TOUCHSCREEN/S3C2410_TS.C add support for touch-screen drivers in the mach-xc2440.c file to create S3c2410_ts_mach_info platform data add the necessary header files:#include <plat/ts.h> xc2440_devices[] structure, add:&s3c_device_ts, building platform data for touch-screen devices:

1. /* Touchpanel */
   
2. static struct s3c2410_ts_mach_info Xc2440_ts_cfg __initdata = {
   
3.     .delay = 10000,
   
4.     .presc = 49
5.     .oversampling_shift = 2
6. }

 in the Xc2440_machine_init function, add:S3c24xx_ts_set_platdata (&xc2440_ts_cfg); To Modify the s3c2410_ts.c file:In the s3c2410ts_probe function, 318 lines start

2. TS. Input = Input_dev;
   
4. ts.input-> Evbit[0= Bit (Ev_key) | Bit (Ev_abs| BIT (Ev_syn)
6. TS. Input->keybit[bits_to_longs(Btn_touch)] = BIT(Btn_touch) ;
   
10. Input_set_abs_params(ts. Input, abs_x, 0, 0x3ff, 0, 0);
    
12. Input_set_abs_params(ts. Input, abs_y, 0, 0x3ff, 0, 0);
    
14. Input_set_abs_params (ts.input, abs_pressure, 0, 1, 0, 0);

in the Touch_timer_fire function:

2. Input_report_abs(ts. Input, abs_x, TS. XP);
   
4. Input_report_abs(ts. Input, abs_y, ts. YP);
   
8. Input_report_key(ts. Input, Btn_touch, 1);
   
10. Input_report_abs (Ts.input, abs_pressure, 1);
12. Input_sync(ts. Input);
    
16. Input_report_key(ts. Input, Btn_touch, 0);
    
18. Input_report_abs (ts.input, abs_pressure, 0);
20. Input_sync(ts. Input);
    
24. Writel(Wait4int | Int_down, ts. io + s3c2410_adctsc);

Configure the kernel to support touch screen:

1. Device Drivers--->
2. Input Devices Support--->
3. <*> Event Interface
4. [*] touchscreens--->
5. <*> Samsung s3c2410/generic Touchscreen input Driver

output at startup:samsung-ts s3c2440-ts:driver attached, registering input deviceinput:s3c24xx touchscreen as/devices/virtual/input/input0 To View the device:/dev/event0 Description: 1. The kernel comes with the touch screen driver has the bug, needs to modify in order to use normally, the concrete modification content please refer to XC2440 's Linux source code package the s3c2410_ts.c file. 2. The device name of the input subsystem device may change depending on the input device in the kernel, such as a key driver in the kernel, then the device name of the touchscreen may be changed from event0 to Event1. The same principle applies to the drive of the input subsystem behind the migration, please note.

Reprint: linux2.6.37.4 Core on XC2440 Development Board porting (vi) touch screen drive porting