Index: drivers/input/input.c =================================================================== --- drivers/input/input.c (revision 1550) +++ drivers/input/input.c (working copy) @@ -29,6 +29,25 @@ #define INPUT_DEVICES 256 +/* + * EV_ABS events which should not be cached are listed here. + */ +static unsigned int input_abs_bypass_init_data[] __initdata = { + ABS_MT_TOUCH_MAJOR, + ABS_MT_TOUCH_MINOR, + ABS_MT_WIDTH_MAJOR, + ABS_MT_WIDTH_MINOR, + ABS_MT_ORIENTATION, + ABS_MT_POSITION_X, + ABS_MT_POSITION_Y, + ABS_MT_TOOL_TYPE, + ABS_MT_BLOB_ID, + ABS_MT_TRACKING_ID, + 0 +}; +static unsigned long input_abs_bypass[BITS_TO_LONGS(ABS_CNT)]; + + static LIST_HEAD(input_dev_list); static LIST_HEAD(input_handler_list); @@ -149,13 +168,17 @@ case SYN_CONFIG: disposition = INPUT_PASS_TO_ALL; break; - + case SYN_REPORT: if (!dev->sync) { dev->sync = 1; disposition = INPUT_PASS_TO_HANDLERS; } break; + case SYN_MT_REPORT: + dev->sync = 0; + disposition = INPUT_PASS_TO_HANDLERS; + break; } break; @@ -185,6 +208,11 @@ case EV_ABS: if (is_event_supported(code, dev->absbit, ABS_MAX)) { + if (test_bit(code, input_abs_bypass)) { + disposition = INPUT_PASS_TO_HANDLERS; + break; + } + value = input_defuzz_abs_event(value, dev->abs[code], dev->absfuzz[code]); @@ -1630,10 +1658,20 @@ .open = input_open_file, }; +static void __init input_init_abs_bypass(void) +{ + const unsigned int *p; + + for (p = input_abs_bypass_init_data; *p; p++) + input_abs_bypass[BIT_WORD(*p)] |= BIT_MASK(*p); +} + static int __init input_init(void) { int err; + input_init_abs_bypass(); + err = class_register(&input_class); if (err) { printk(KERN_ERR "input: unable to register input_dev class\n");
3、输入子系统的初始化