29内核输入子系统多点上报机制实现

电容屏被广泛使用，多点触摸机制也随之发展，可惜29内核不支持多点上报，30以后内核才支持。

特此记录移植过程。

1、修改include/linux/input.h

 Index: include/linux/input.h<br />===================================================================<br />— include/linux/input.h (revision 1550)<br />+++ include/linux/input.h (working copy)<br />@@ -106,6 +106,7 @@</p> <p> #define SYN_REPORT 0<br /> #define SYN_CONFIG 1<br />+#define SYN_MT_REPORT 2</p> <p> /*<br /> * Keys and buttons<br />@@ -644,6 +645,18 @@<br /> #define ABS_TOOL_WIDTH 0x1c<br /> #define ABS_VOLUME 0x20<br /> #define ABS_MISC 0x28<br />+<br />+#define ABS_MT_TOUCH_MAJOR 0x30 /* Major axis of touching ellipse */<br />+#define ABS_MT_TOUCH_MINOR 0x31 /* Minor axis (omit if circular) */<br />+#define ABS_MT_WIDTH_MAJOR 0x32 /* Major axis of approaching ellipse */<br />+#define ABS_MT_WIDTH_MINOR 0x33 /* Minor axis (omit if circular) */<br />+#define ABS_MT_ORIENTATION 0x34 /* Ellipse orientation */<br />+#define ABS_MT_POSITION_X 0x35 /* Center X ellipse position */<br />+#define ABS_MT_POSITION_Y 0x36 /* Center Y ellipse position */<br />+#define ABS_MT_TOOL_TYPE 0x37 /* Type of touching device */<br />+#define ABS_MT_BLOB_ID 0x38 /* Group a set of packets as a blob */<br />+#define ABS_MT_TRACKING_ID 0x39 /* Unique ID of initiated contact */<br />+<br /> #define ABS_MAX 0x3f<br /> #define ABS_CNT (ABS_MAX+1)</p> <p>@@ -742,6 +755,12 @@<br /> #define BUS_ATARI 0x1B</p> <p> /*<br />+ * MT_TOOL types<br />+ */<br />+#define MT_TOOL_FINGER 0<br />+#define MT_TOOL_PEN 1<br />+<br />+/*<br /> * Values describing the status of a force-feedback effect<br /> */<br /> #define FF_STATUS_STOPPED 0x00<br />@@ -1310,6 +1329,11 @@<br /> input_event(dev, EV_SYN, SYN_REPORT, 0);<br /> }</p> <p>+static inline void input_mt_sync(struct input_dev *dev)<br />+{<br />+ input_event(dev, EV_SYN, SYN_MT_REPORT, 0);<br />+}<br />+<br /> void input_set_capability(struct input_dev *dev, unsigned int type, unsigned int code);

2、修改drivers/input/input.c

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

3、输入子系统的初始化

input_dev->evbit[0] = BIT(EV_SYN) | BIT(EV_KEY) | BIT(EV_ABS);<br /> input_dev->absbit[0] =<br /> BIT_MASK(ABS_X) |<br /> BIT_MASK(ABS_Y) |<br /> BIT_MASK(ABS_MT_TOUCH_MAJOR) |<br /> BIT_MASK(ABS_MT_WIDTH_MAJOR) |<br /> BIT_MASK(ABS_MT_POSITION_X) |<br /> BIT_MASK(ABS_MT_POSITION_Y) |<br /> BIT_MASK(ABS_MT_TRACKING_ID);

4、子系统上报

input_report_key(ts->input, ABS_MT_TRACKING_ID, touch_num);<br /> input_report_abs(ts->input, ABS_MT_POSITION_X, mxt224_datablock.T_point[touch_num].x);<br /> input_report_abs(ts->input, ABS_MT_POSITION_Y, mxt224_datablock.T_point[touch_num].y);<br /> input_report_abs(ts->input, ABS_MT_TOUCH_MAJOR, mxt224_datablock.T_point[touch_num].amplitude);<br /> input_report_abs(ts->input, ABS_MT_WIDTH_MAJOR, mxt224_datablock.T_point[touch_num].area);<br /> input_report_abs(ts->input, ABS_PRESSURE,mxt224_datablock.T_gesture[touch_num].value);<br /> /*input_report_key(ts->input, BTN_TOUCH, 1);*/</p> <p> input_mt_sync(ts->input);

注： 转载请注明出处

今天的文章29内核输入子系统多点上报机制实现分享到此就结束了，感谢您的阅读。