當(dāng)前位置：首頁 > 编程资源 > 编程问答 >内容正文

编程问答

tca8418

發(fā)布時(shí)間：2024/1/18 编程问答 26 豆豆

生活随笔收集整理的這篇文章主要介紹了 tca8418 小編覺得挺不錯(cuò)的,現(xiàn)在分享給大家,幫大家做個(gè)參考.

驅(qū)動位置
kernel_imx/drivers/input/keyboard/tca8418_keypad.c
kernel_imx/Documentation/devicetree/bindings/input/tca8418_keypad.txt
1.硬件i2c2 地址0x34
中斷:GPIO_4 MX6QDL_PAD_GPIO_4__GPIO1_IO04
matrix_keypad_parse_of_params會用到
kernel_imx/drivers/input/matrix-keymap.c
keypad,num-rows
keypad,num-columns
linux,keymap

2.調(diào)試
打印信息
# getevent -i?????????????????????????????????????????????????? ?
add device 1: /dev/input/event6
? bus:????? 0018
? vendor??? 0001
? product?? 0001
? version?? 0001
? name:???? "tca8418"
? location: ""
? id:?????? ""
? version:? 1.0.1
? events:
??? KEY (0001): 0005? 0006? 0007? 0008? 0009? 000a? 000b? 020a
??????????????? 020b
??? MSC (0004): 0004
? input props:
??? <none>

根據(jù)kernel_imx/arch/metag/boot/dts/include/dt-bindings/input/input.h值
調(diào)整銨鍵映射的值
0,0 KEY_RIGHT? 0x6a
0,1 KEY_BACK?? 0x9e
0,2 KEY_UP???? 0x67
1,0 KEY_ENTER? 0x1C//確認(rèn)
1,1 KEY_MUSIC 0XD5 //F1
1,2 KEY_DOWN?? 0x6c
2,0 KEY_BACKSPACE 0xe//刪除
2,1 KEY_AUDIO? 0xbc
2,2 KEY_LEFT??? 0X69

3.dtsi
+?????? tca8418@34{
+?????????????? compatible = "ti,tca8418";
+?????????????? reg = <0x34>;
+?????????????? interrupt-parent = <&gpio1>;
+?????????????? interrupts = <4 2>;
+?????????????? keypad,num-rows = <3>;
+?????????????? keypad,num-columns = <3>;
+?????????????? linux,keymap = <
+?????????????????????? 0x0000006a? /*KEY_RIGHT*/
+?????????????????????? 0x0001009e? /* KEY_BACK 0x9e*/
+?????????????????????? 0x00020067? /*KEY_UP*/
+?????????????????????? 0x0100001c
+?????????????????????? 0x010100d5
+?????????????????????? 0x0102006c
+?????????????????????? 0x0200000e
+?????????????????????? 0x020100bc
+?????????????????????? 0x02020069
+?????????????????????? >;???? ?
+?????? };

? pinctrl_hog: hoggrp {
??????????????????????? fsl,pins = <
??????????????????????????????? MX6QDL_PAD_NANDF_D0__GPIO2_IO00 0x80000000? /*microsd cd pin*/
+?????????????????????????????? MX6QDL_PAD_GPIO_4__GPIO1_IO04? 0x1b0b0????? /*tca8418 irq pin*/
};

4.修改調(diào)用的優(yōu)先級subsys_initcall比module_init先調(diào)用,可能i2c總線還沒有走完造成i2c寫配置失敗
--- a/kernel_imx/drivers/input/keyboard/tca8418_keypad.c
+++ b/kernel_imx/drivers/input/keyboard/tca8418_keypad.c
@@ -415,7 +415,7 @@ static int __init tca8418_keypad_init(void)
?{
??????? return i2c_add_driver(&tca8418_keypad_driver);
?}
-subsys_initcall(tca8418_keypad_init);
+module_init(tca8418_keypad_init);

總結(jié)

以上是生活随笔為你收集整理的tca8418的全部內(nèi)容，希望文章能夠幫你解決所遇到的問題。

如果覺得生活随笔網(wǎng)站內(nèi)容還不錯(cuò)，歡迎將生活随笔推薦給好友。