一：基礎知識
?? ?硬件原理
?? ?NORMAL_TYPE
?? ??? ?Row0--Row7
?? ??? ?KCOL0--KCOL7
?? ?EXTEND_TYPE?? ?
?? ??? ?Row0--Row3
?? ??? ?KCOL0 KCOL0_R
?? ??? ?KCOL1 KCOL1_R
?? ??? ?KCOL2-KCOL2_R?
?? ?讀建方式
?? ??? ?1.kernel 按鍵配置
?? ??? ??? ?Set to Y to enable MTK keypad driver.
?? ??? ??? ?? CONFIG_ONEKEY_REBOOT_NORMAL_MODE
?? ??? ??? ?Set to Y to set long press reboot by power key on normal mode.
?? ??? ??? ?? CONFIG_ONEKEY_REBOOT_OTHER_MODE
?? ??? ??? ?Set to Y to set long press reboot by power key on other boot mode.
?? ??? ??? ?? CONFIG_ KPD_PMIC_LPRST_TD
?? ??? ??? ?Long press reset time
?? ??? ??? ?0: 8 second, 1: 11 second, 2: 14 second, 3: 5 second
?? ??? ??? ?CONFIG_KEYBOARD_MTK=y
?? ??? ??? ?CONFIG_TWOKEY_REBOOT_NORMAL_MODE=y
?? ??? ??? ?CONFIG_TWOKEY_REBOOT_OTHER_MODE=y
?? ??? ??? ?CONFIG_KPD_PWRKEY_USE_PMIC=y
?? ??? ?2.按鍵采用中斷 tasklet 輪詢方式讀鍵值 ? tasklet 在軟件中斷上下文中運行，所以 tasklet 代碼必須是原子的
?? ??? ??? ?static DECLARE_TASKLET(kpd_keymap_tasklet, kpd_keymap_handler, 0); //初始化 tasklet
?? ??? ??? ?static void kpd_keymap_handler(unsigned long data)
?? ??? ??? ?{
?? ??? ??? ??? ?int i, j;
?? ??? ??? ??? ?bool pressed;
?? ??? ??? ??? ?u16 new_state[KPD_NUM_MEMS], change, mask;
?? ??? ??? ??? ?u16 hw_keycode, linux_keycode;

?? ??? ??? ??? ?kpd_get_keymap_state(new_state);

?? ??? ??? ??? ?wake_lock_timeout(&kpd_suspend_lock, HZ / 2);

?? ??? ??? ??? ?for (i = 0; i < KPD_NUM_MEMS; i++) {?? ??? ?//輪詢 ?
?? ??? ??? ??? ??? ?change = new_state[i] ^ kpd_keymap_state[i];
?? ??? ??? ??? ??? ?if (!change)
?? ??? ??? ??? ??? ??? ?continue;

?? ??? ??? ??? ??? ?for (j = 0; j < 16; j++) {
?? ??? ??? ??? ??? ??? ?mask = 1U << j;
?? ??? ??? ??? ??? ??? ?if (!(change & mask))
?? ??? ??? ??? ??? ??? ??? ?continue;

?? ??? ??? ??? ??? ??? ?hw_keycode = (i << 4) + j;
?? ??? ??? ??? ??? ??? ?/* bit is 1: not pressed, 0: pressed */
?? ??? ??? ??? ??? ??? ?pressed = !(new_state[i] & mask);
?? ??? ??? ??? ??? ??? ?if (kpd_show_hw_keycode)
?? ??? ??? ??? ??? ??? ??? ?kpd_print("(%s) HW keycode = %u\n", pressed ? "pressed" : "released", hw_keycode);
?? ??? ??? ??? ??? ??? ?BUG_ON(hw_keycode >= KPD_NUM_KEYS);
?? ??? ??? ??? ??? ??? ?linux_keycode = kpd_keymap[hw_keycode]; //可以打印log ，查看
?? ??? ??? ??? ??? ??? ?if (unlikely(linux_keycode == 0)) {
?? ??? ??? ??? ??? ??? ??? ?kpd_print("Linux keycode = 0\n");
?? ??? ??? ??? ??? ??? ??? ?continue;
?? ??? ??? ??? ??? ??? ?}
?? ??? ??? ??? ??? ??? ?kpd_aee_handler(linux_keycode, pressed);

?? ??? ??? ??? ??? ??? ?input_report_key(kpd_input_dev, linux_keycode, pressed);
?? ??? ??? ??? ??? ??? ?input_sync(kpd_input_dev);
?? ??? ??? ??? ??? ??? ?kpd_print("report Linux keycode = %u\n", linux_keycode);
?? ??? ??? ??? ??? ?}
?? ??? ??? ??? ?}

?? ??? ??? ??? ?memcpy(kpd_keymap_state, new_state, sizeof(new_state));
?? ??? ??? ??? ?kpd_print("save new keymap state\n");
?? ??? ??? ??? ?enable_irq(kp_irqnr); //開中斷
?? ??? ??? ?}?? ??
?? ??? ??? ?static irqreturn_t kpd_irq_handler(int irq, void *dev_id)
?? ??? ??? ?{
?? ??? ??? ? disable_irq_nosync(kp_irqnr); //在中斷處理函數中使用，不會阻塞；用于屏蔽相應中斷；
?? ??? ??? ? tasklet_schedule(&kpd_keymap_tasklet);?? ??? ?/能使系統在適當的時候進行調度 kpd_keymap_handler
?? ??? ??? ? return IRQ_HANDLED;?? ??? ?//中斷是由本設備引起的
?? ??? ??? ?}
?? ??? ??? ?static int kpd_pdrv_probe(struct platform_device *pdev)
?? ??? ??? ?{
?? ??? ??? ??? ?kp_irqnr = irq_of_parse_and_map(pdev->dev.of_node, 0);
?? ??? ??? ??? ?kpd_set_debounce(kpd_dts_data.kpd_key_debounce);
?? ??? ??? ??? ?r = request_irq(kp_irqnr, kpd_irq_handler, IRQF_TRIGGER_NONE, KPD_NAME, NULL);

?? ??? ??? ??? ?mt_eint_register(); ?//開中斷
?? ??? ??? ?}
?? ??? ?3.按鍵從kernel到Android的過程
?? ??? ??? ?./kernel-3.18/drivers/input/keyboard/mediatek/kpd.c ?驅動
?? ??? ??? ??? ?
?? ??? ??? ?./kernel-3.18/include/uapi/linux/input.h?? ??? ??? ? kernel 鍵值
?? ??? ??? ??? ?#define KEY_VOLUMEUP ? ? ? ?115
?? ??? ??? ?./device/teksun/hys6737m_35_m0/mtk-kpd.kl ?? ?linux和android key映射
?? ??? ??? ??? ?key 115 ? VOLUME_UP
?? ??? ??? ?./frameworks/base/data/keyboards/Generic.kl
?? ??? ??? ?./frameworks/base/data/keyboards/qwerty.kl
?? ??? ??? ?進入system/usr/keylyout/可以看到所用的KL
?? ??? ??? ?frameworks/native/include/android/keycodes.h
?? ??? ??? ??? ?AKEYCODE_VOLUME_UP ? ? ? = 24,
?? ??? ??? ?frameworks/base/core/java/android/view/KeyEvent.java ?Java 鍵盤事件
?? ??? ??? ? ?public static final int KEYCODE_VOLUME_UP ? ? ? = 24;
?? ??? ??? ?frameworks/base/core/res/res/values/attrs.xml
?? ??? ??? ??? ?<enum name="KEYCODE_VOLUME_UP" value="24" /> ?修改XML文件描述符
?? ??? ??? ?./frameworks/base/services/core/java/com/android/server/policy/PhoneWindowManager.java
?? ??? ??? ? public long interceptKeyBeforeDispatching(WindowState win, KeyEvent event, int policyFlags) {
?? ??? ??? ??? ??? ?final boolean keyguardOn = keyguardOn();
?? ??? ??? ??? ??? ?final int keyCode = event.getKeyCode();
?? ??? ??? ??? ??? ?if (keyCode == KeyEvent.KEYCODE_VOLUME_UP){
?? ??? ??? ??? ??? ?
?? ??? ??? ??? ??? ?}
?? ??? ??? ??? ?}
二：按鍵配置
?? ?key主要指：
?? ?POWER ? //此鍵固定。不需要配置
?? ?VOLUMEUP?? ??? ?VOLUMEDOWN
?? ?
?? ?查看原理圖:
?? ??? ??? ?KROW0?? ??? ?
?? ?KCOL0?? ?VOLUMEUP
?? ?KCOL1?? ?VOLUMEDOWN
?? ?
?? ?在dws中配置：
?? ??? ??? ?Column0?? ??? ?Column1?? ??? ?
?? ?Row0?? ?VOLUMEUP?? ?VOLUMEDOWN

?? ?
?? ?在dws中配置gpio(L - IN ; R - OUT)
?? ??? ??? ?EintMode|Def.Mode?? ?M0|M1|M2|M3|M4|M5|M6|M7|InPull En|InPull SelHigh|Def.Dir|In|Out|OutHigh|VarName1
?? ?GPIO81?? ??? ??? ?0:KPROW0?? ?1 ?1 ??? ??? ??? ??? ??? ??? ??? ??? ??? ??? ??? ? OUT?? ? 0?? ?1?? ?0?? ??? ?GPIO_KPD_KROW0_PIN
?? ?GPIO84?? ??? ??? ?0:KPCOL0?? ?1 ?1 ??? ??? ??? ??? ??? ?1?? ??? ? ?1?? ??? ??? ??? ? IN?? ? ?? ? 1?? ?1?? ?0?? ??? ?GPIO_KPD_KCOL0_PIN
?? ?GPIO85?? ??? ??? ?0:KPCOL1?? ?1 ?1 ??? ??? ??? ??? ??? ?1?? ??? ? ?1?? ??? ??? ??? ? IN?? ? ?? ? 1?? ?1?? ?0?? ??? ?GPIO_KPD_KCOL1_PIN

?? ?dws配置EINT : NC 即可
三：調試方法
?? ?1.1 kernel查看驅動上報事件 - 驅動打印:
?? ??? ?cat /proc/kmsg | grep "key"
?? ??? ?應用層事件 -?
?? ??? ?logcat | grep KeyCode ?
?? ??? ?logcat | grep KeyEvent?? ?
?? ??? ?
?? ?1.2 kernel查看event上報事件 - kernel打印:
?? ??? ?getevent -i ?? ?-- 查看所有輸入子設備的信息
?? ??? ?getevent –t -l /dev/input/event0
?? ?1.3 查看中斷計數 (按下+1, 松開+1)
?? ??? ?cat /proc/interrupts | grep "mtk-kpd"

?? ?1.4 查看dws配置out目錄生成的文件是否對
?? ??? ?./out/target/product/hys6737m_35_m0/obj/BOOTLOADER_OBJ/build-hys6737m_35_m0/inc/cust_kpd.h
?? ??? ?./out/target/product/hys6737m_35_m0/obj/PRELOADER_OBJ/inc/cust_kpd.h
?? ??? ?修改dws中gpio口發現只 有lk和 pl 在out目錄有生成
?? ??? ? #define KPD_INIT_KEYMAP() ? \
?? ??? ? { ? \
?? ??? ??? ? [1] = KEY_VOLUMEUP, ? ? \
?? ??? ??? ? [2] = KEY_VOLUMEDOWN, ? ? ? \
?? ??? ? }
四：GPIO 框架外的調試：
?? ?中斷方式
?? ??? ?1.1 dts 配置
?? ??? ??? ?/ {?? ?mc_key: mc_key@0 {
?? ??? ??? ??? ?compatible = "mediatek,mc_key"; ?//定義設備
?? ??? ??? ?};?? ?
?? ??? ??? ??? ?};
?? ??? ??? ??? ?/*mc-key*/
?? ??? ??? ??? ?#define?? ?__MC_KEY_EINT_PIN__?? ??? ??? ??? ?PINMUX_GPIO6__FUNC_GPIO6
?? ??? ??? ??? ?#define?? ?__MC_KEY_EINT_EN_PIN_NUM__?? ??? ?6
?? ??? ??? ??? ?&mc_key{
?? ??? ??? ??? ??? ?interrupt-parent = <&eintc>;
?? ??? ??? ??? ??? ?interrupts = <__MC_KEY_EINT_EN_PIN_NUM__ IRQ_TYPE_EDGE_FALLING>;
?? ??? ??? ??? ??? ?debounce = <__MC_KEY_EINT_EN_PIN_NUM__ 100>;
?? ??? ??? ??? ??? ?status = "okay";
?? ??? ??? ??? ?};
?? ??? ??? ??? ?&pio {
?? ??? ??? ??? ??? ?mc_key_default:mc_key_default{
?? ??? ??? ??? ??? ?};
?? ??? ??? ??? ??? ?mc_key_as_int: mc_key_as_int@0{
?? ??? ??? ??? ??? ??? ??? ?pins_cmd_dat {
?? ??? ??? ??? ??? ??? ??? ??? ?pins = <__MC_KEY_EINT_PIN__>;
?? ??? ??? ??? ??? ??? ??? ??? ?slew-rate = <0>;
?? ??? ??? ??? ??? ??? ??? ??? ?bias-pull-up = <00>;
?? ??? ??? ??? ??? ??? ??? ?};
?? ??? ??? ??? ??? ?};
?? ??? ??? ??? ?};
?? ??? ??? ??? ?&keypad{
?? ??? ??? ??? ??? ?pinctrl-names = "default", "mc_key_as_int";
?? ??? ??? ??? ??? ?pinctrl-0 = <&mc_key_default>;
?? ??? ??? ??? ??? ?pinctrl-1 = <&mc_key_as_int>;

?? ??? ??? ??? ?};
?? ??? ?1.2 獲取dts配置值
?? ??? ??? ?#ifdef CUST_EINT_WPS_PIN

?? ??? ??? ?#define CUST_EINT_KPD_PWRKEY_MAP ? ? ? ? ? ?KEY_F1

?? ??? ??? ?struct device_node *node;
?? ??? ??? ?int key_mc_irq;
?? ??? ??? ?u32 intmc[2] = {0, 0};

?? ??? ??? ?struct pinctrl *key_mc_pinctrl;
?? ??? ??? ?struct pinctrl_state *key_mc_set_input;

?? ??? ??? ?static u8 kpd_wpskey_state = !IRQ_TYPE_LEVEL_LOW;
?? ??? ??? ?static void kpd_wpskey_handler(unsigned long data);
?? ??? ??? ?static DECLARE_TASKLET(kpd_wpskey_tasklet, kpd_wpskey_handler, 0);

?? ??? ??? ?int mc_key_get_gpio_info(struct platform_device *pdev){?? ??? ?//采用平臺節點
?? ??? ??? ??? ?int ret;
?? ??? ??? ??? ?//printk("[%s] key_mc_pinctrl+++++++++++++++++\n",pdev->name);
?? ??? ??? ??? ?key_mc_pinctrl = devm_pinctrl_get(&pdev->dev);
?? ??? ??? ??? ??? ?

?? ??? ??? ??? ?key_mc_set_input = pinctrl_lookup_state(key_mc_pinctrl, "mc_key_as_int");
?? ??? ??? ??? ?
?? ??? ??? ??? ?if (IS_ERR(key_mc_set_input)) {
?? ??? ??? ??? ??? ?ret = PTR_ERR(key_mc_set_input);
?? ??? ??? ??? ??? ?dev_err(&pdev->dev, " Cannot find key mc ?pinctrl key_mc_pinctrl!\n");
?? ??? ??? ??? ??? ?return ret;
?? ??? ??? ??? ?}
?? ??? ??? ??? ?if(!IS_ERR(key_mc_set_input)){
?? ??? ??? ??? ??? ?pinctrl_select_state(key_mc_pinctrl, key_mc_set_input);
?? ??? ??? ??? ?}?? ?
?? ??? ??? ??? ?//printk("[%s] key_mc_pinctrl+++++++++++++++++\n",pdev->name);
?? ??? ??? ??? ?return 0;
?? ??? ??? ?}
?? ??? ??? ?int ?eint_mc_init(void){
?? ??? ??? ??? ?//printk("%s, mc_key start\n",__func__);
?? ??? ??? ??? ?node = of_find_compatible_node(NULL, NULL, "mediatek,mc_key");
?? ??? ??? ??? ?if(node) {
?? ??? ??? ??? ??? ?of_property_read_u32_array(node, "debounce", intmc, ARRAY_SIZE(intmc));
?? ??? ??? ??? ??? ?gpio_set_debounce(intmc[0], intmc[1]);
?? ??? ??? ??? ??? ?key_mc_irq = irq_of_parse_and_map(node, 0);
?? ??? ??? ??? ?
?? ??? ??? ??? ??? ?if(request_irq(key_mc_irq, kpd_wpskey_eint_handler, IRQ_TYPE_EDGE_FALLING, "P_KEY", NULL)){
?? ??? ??? ??? ??? ?//printk(KERN_ERR "key_mc_irq EXAMPLE KEY_MC_IRQ LINE NOT AVAILABLE!!\n");
?? ??? ??? ??? ??? ??? ?return -EINVAL;
?? ??? ??? ??? ??? ?}
?? ??? ??? ??? ??? ?enable_irq(key_mc_irq);
?? ??? ??? ??? ??? ?__set_bit(CUST_EINT_KPD_PWRKEY_MAP, kpd_input_dev->keybit);
?? ??? ??? ??? ??? ?//wps_set_init();
?? ??? ??? ??? ?}
?? ??? ??? ??? ?return 0;
?? ??? ??? ?}
?? ??? ??? ?1.3 軟件代碼
?? ??? ??? ??? ?void kpd_wpskey_handler_hal(unsigned long data){

?? ??? ??? ??? ??? ?bool pressed;

?? ??? ??? ??? ??? ?kpd_wpskey_state = !kpd_wpskey_state;
?? ??? ??? ??? ??? ?pressed = (kpd_wpskey_state == !!IRQ_TYPE_LEVEL_LOW);

?? ??? ??? ??? ??? ?printk(KPD_SAY "(%s) HW keycode = using wps EINT\n",
?? ??? ??? ??? ??? ??? ? ? pressed ? "pressed" : "released");

?? ??? ??? ??? ??? ?input_report_key(kpd_input_dev, CUST_EINT_KPD_PWRKEY_MAP, pressed);
?? ??? ??? ??? ??? ?input_sync(kpd_input_dev);
?? ??? ??? ??? ??? ?//wps_report(pressed);
?? ??? ??? ??? ??? ?printk("report Linux keycode = %u\n", CUST_EINT_KPD_PWRKEY_MAP);

?? ??? ??? ??? ??? ?/* for detecting the return to old_state */
?? ??? ??? ??? ??? ?if(pressed){
?? ??? ??? ??? ??? ??? ?irq_set_irq_type(key_mc_irq, IRQ_TYPE_LEVEL_HIGH);

?? ??? ??? ??? ??? ?}else{
?? ??? ??? ??? ??? ??? ?irq_set_irq_type(key_mc_irq, IRQ_TYPE_LEVEL_LOW);
?? ??? ??? ??? ??? ?}
?? ??? ??? ??? ??? ?enable_irq(key_mc_irq);

?? ??? ??? ??? ?}

?? ??? ??? ??? ?static void kpd_wpskey_handler(unsigned long data)
?? ??? ??? ??? ?{
?? ??? ??? ??? ??? ?kpd_wpskey_handler_hal(data);
?? ??? ??? ??? ?}

?? ??? ??? ??? ?irqreturn_t kpd_wpskey_eint_handler(int irq, void *dev_id)
?? ??? ??? ??? ?{
?? ??? ??? ??? ??? ?disable_irq_nosync(key_mc_irq);
?? ??? ??? ??? ??? ?tasklet_schedule(&kpd_wpskey_tasklet);
?? ??? ??? ??? ??? ?return IRQ_HANDLED;
?? ??? ??? ??? ?}

?? ??? ??? ?

?? ?輪詢方式 無中斷的偏碼器輪詢
?? ??? ?1.1 dts 配置?
?? ??? ??? ?#define __ZKT_ENCODER_A_PIN__ ?PINMUX_GPIO34__FUNC_GPIO34?? ?//PINMUX_GPIO30__FUNC_GPIO30//PINMUX_GPIO34__FUNC_GPIO34
?? ??? ??? ?#define __ZKT_ENCODER_B_PIN__ ?PINMUX_GPIO35__FUNC_GPIO35?? ?//PINMUX_GPIO30__FUNC_GPIO30//PINMUX_GPIO35__FUNC_GPIO35
?? ??? ??? ?#define __ZKT_ENCODER_C_PIN__ ?PINMUX_GPIO32__FUNC_GPIO32
?? ??? ??? ?#define __ZKT_ENCODER_D_PIN__ ?PINMUX_GPIO33__FUNC_GPIO33
?? ??? ??? ?&keypad {
?? ??? ??? ??? ?pinctrl-names = "pin_default", "zkt_encoder_a_input","zkt_encoder_b_input","zkt_encoder_c_input",
?? ??? ??? ??? ??? ??? ??? ??? ?"zkt_encoder_d_input","zkt_speaker_output0";
?? ??? ??? ??? ?pinctrl-0 = <&zkt_pin_default>;
?? ??? ??? ??? ?pinctrl-1 = <&zkt_encoder_a_input>;
?? ??? ??? ??? ?pinctrl-2 = <&zkt_encoder_b_input>;
?? ??? ??? ??? ?pinctrl-3 = <&zkt_encoder_c_input>;
?? ??? ??? ??? ?pinctrl-4 = <&zkt_encoder_d_input>;
?? ??? ??? ??? ?pinctrl-5 = <&zkt_speaker_output0>;
?? ??? ??? ?};
?? ??? ??? ?&pio {
?? ??? ??? ??? ?zkt_pin_default: zkt_pin_default@0 {

?? ??? ??? ??? ?};
?? ??? ??? ??? ?zkt_encoder_a_input: zkt_pin@1 {
?? ??? ??? ??? ??? ?pins_cmd_dat {
?? ??? ??? ??? ??? ??? ?pins = <__ZKT_ENCODER_A_PIN__>;
?? ??? ??? ??? ??? ??? ?slew-rate = <0>;
?? ??? ??? ??? ??? ??? ?bias-disable;
?? ??? ??? ??? ??? ?};
?? ??? ??? ??? ?};
?? ??? ??? ??? ?zkt_encoder_b_input: zkt_pin@2 {
?? ??? ??? ??? ??? ?pins_cmd_dat {
?? ??? ??? ??? ??? ??? ?pins = <__ZKT_ENCODER_B_PIN__>;
?? ??? ??? ??? ??? ??? ?slew-rate = <0>;
?? ??? ??? ??? ??? ??? ?bias-disable;
?? ??? ??? ??? ??? ?};
?? ??? ??? ??? ?};
?? ??? ??? ??? ?zkt_encoder_c_input: zkt_pin@3 {
?? ??? ??? ??? ??? ?pins_cmd_dat {
?? ??? ??? ??? ??? ??? ?pins = <__ZKT_ENCODER_C_PIN__>;
?? ??? ??? ??? ??? ??? ?slew-rate = <0>;
?? ??? ??? ??? ??? ??? ?bias-disable;
?? ??? ??? ??? ??? ?};
?? ??? ??? ??? ?};
?? ??? ??? ??? ?zkt_encoder_d_input: zkt_pin@4 {
?? ??? ??? ??? ??? ?pins_cmd_dat {
?? ??? ??? ??? ??? ??? ?pins = <__ZKT_ENCODER_D_PIN__>;
?? ??? ??? ??? ??? ??? ?slew-rate = <0>;
?? ??? ??? ??? ??? ??? ?bias-disable;
?? ??? ??? ??? ??? ?};
?? ??? ??? ??? ?};
?? ??? ??? ??? ?
?? ??? ??? ??? ?zkt_speaker_output0: zkt_pin@5 {
?? ??? ??? ??? ??? ?pins_cmd_dat {
?? ??? ??? ??? ??? ??? ?pins = <__ZKT_SPEARER_PIN__>;
?? ??? ??? ??? ??? ??? ?slew-rate = <1>;
?? ??? ??? ??? ??? ??? ?output-low;
?? ??? ??? ??? ??? ?};
?? ??? ??? ??? ?};
?? ??? ??? ??? ?zkt_speaker_output1: zkt_pin@56{
?? ??? ??? ??? ??? ?pins_cmd_dat {
?? ??? ??? ??? ??? ??? ?pins = <__ZKT_SPEARER_PIN__>;
?? ??? ??? ??? ??? ??? ?slew-rate = <1>;
?? ??? ??? ??? ??? ??? ?output-high;
?? ??? ??? ??? ??? ?};
?? ??? ??? ??? ?};
?? ??? ??? ?};
?? ?1.2 dts解析
?? ??? ??? ?struct pinctrl *zktpinctrl1;
?? ??? ??? ?struct pinctrl_state ?? ??? ?*zkt_encoder_input0, *zkt_encoder_input1,?? ??? ??? ?//as input
?? ??? ??? ??? ??? ??? ??? ??? ??? ??? ?*zkt_encoder_input2, *zkt_encoder_input3;?? ??? ??? ?//as input

?? ??? ??? ?int zkt_key_get_gpio_info(struct platform_device *pdev) ?//采用平臺節點
?? ??? ??? ?{
?? ??? ??? ??? ??? ?int ret;

?? ??? ??? ??? ?//printk("zktpinctrl+++++++++++++++++\n");
?? ??? ??? ??? ?zktpinctrl1 = devm_pinctrl_get(&pdev->dev);
?? ??? ??? ??? ?if (IS_ERR(zktpinctrl1)) {
?? ??? ??? ??? ??? ?ret = PTR_ERR(zktpinctrl1);
?? ??? ??? ??? ??? ?dev_err(&pdev->dev, "fwq Cannot find mc led ?zktpinctrl1!\n");
?? ??? ??? ??? ??? ?return ret;
?? ??? ??? ??? ?}?? ?
?? ??? ??? ??? ?zkt_encoder_input0 = pinctrl_lookup_state(zktpinctrl1, "zkt_encoder_a_input");
?? ??? ??? ??? ?if (IS_ERR(zkt_encoder_input0)) {
?? ??? ??? ??? ??? ?ret = PTR_ERR(zkt_encoder_input0);
?? ??? ??? ??? ??? ?dev_err(&pdev->dev, "zkt Cannot find led pinctrl zkt_encoder_input0!\n");
?? ??? ??? ??? ??? ?return ret;
?? ??? ??? ??? ?}
?? ??? ??? ??? ?zkt_encoder_input1 = pinctrl_lookup_state(zktpinctrl1, "zkt_encoder_b_input");
?? ??? ??? ??? ?if (IS_ERR(zkt_encoder_input1)) {
?? ??? ??? ??? ??? ?ret = PTR_ERR(zkt_encoder_input1);
?? ??? ??? ??? ??? ?dev_err(&pdev->dev, "zkt Cannot find led pinctrl zkt_encoder_input1!\n");
?? ??? ??? ??? ??? ?return ret;
?? ??? ??? ??? ?}
?? ??? ??? ??? ?zkt_encoder_input2 = pinctrl_lookup_state(zktpinctrl1, "zkt_encoder_c_input");
?? ??? ??? ??? ?if (IS_ERR(zkt_encoder_input2)) {
?? ??? ??? ??? ??? ?ret = PTR_ERR(zkt_encoder_input2);
?? ??? ??? ??? ??? ?dev_err(&pdev->dev, "zkt Cannot find led pinctrl zkt_encoder_input2!\n");
?? ??? ??? ??? ??? ?return ret;
?? ??? ??? ??? ?}
?? ??? ??? ??? ?zkt_encoder_input3 = pinctrl_lookup_state(zktpinctrl1, "zkt_encoder_d_input");
?? ??? ??? ??? ?if (IS_ERR(zkt_encoder_input3)) {
?? ??? ??? ??? ??? ?ret = PTR_ERR(zkt_encoder_input3);
?? ??? ??? ??? ??? ?dev_err(&pdev->dev, "zkt Cannot find led pinctrl zkt_encoder_input3!\n");
?? ??? ??? ??? ??? ?return ret;
?? ??? ??? ??? ?}
?? ??? ??? ??? ?return 0;
?? ??? ??? ?}
?? ?1.3 軟件代碼

?? ??? ??? ?static struct timer_list buttons_timer;
?? ??? ??? ?static unsigned int pinval=0x0f,pinvalold=0xff;
?? ??? ??? ?static unsigned int key_val=KEY_1;?
?? ??? ??? ?static unsigned int key_table[]={
?? ??? ??? ??? ?9,//5,
?? ??? ??? ??? ?1,//4,
?? ??? ??? ??? ?6,//10,
?? ??? ??? ??? ?12,//3,
?? ??? ??? ??? ?10,//9,
?? ??? ??? ??? ?2,//8,
?? ??? ??? ??? ?5,//6,
?? ??? ??? ??? ?13,//7,
?? ??? ??? ??? ?15,//15,
?? ??? ??? ??? ?11,//13,
?? ??? ??? ??? ?0,//0,
?? ??? ??? ??? ?4,//2,
?? ??? ??? ??? ?14,//11,
?? ??? ??? ??? ?8,//1,
?? ??? ??? ??? ?3,//12,
?? ??? ??? ??? ?7,//14
?? ??? ??? ?};
?? ??? ??? ?static unsigned int key_report_val_table[] = {
?? ??? ??? ??? ?KEY_1,//1
?? ??? ??? ??? ?KEY_2,//2
?? ??? ??? ??? ?KEY_3,//3
?? ??? ??? ??? ?KEY_4,//4
?? ??? ??? ??? ?KEY_5,//5
?? ??? ??? ??? ?KEY_6,//6
?? ??? ??? ??? ?KEY_7,//7
?? ??? ??? ??? ?KEY_8,//8
?? ??? ??? ??? ?KEY_9,//9
?? ??? ??? ??? ?KEY_A,//10
?? ??? ??? ??? ?KEY_B,//11
?? ??? ??? ??? ?KEY_C,//12
?? ??? ??? ??? ?KEY_D,//13
?? ??? ??? ??? ?KEY_E,//14
?? ??? ??? ??? ?KEY_F,//15
?? ??? ??? ??? ?KEY_G,//16
?? ??? ??? ?};
?? ??? ??? ?void input_report_encoder(unsigned int temp)
?? ??? ??? ?{
?? ??? ??? ??? ?unsigned int i,key_report_val;
?? ??? ??? ??? ?for(i=0;i<(sizeof(key_table)/4);i++)?? ??? ?//按鍵轉換需要的值
?? ??? ??? ??? ?{
?? ??? ??? ??? ??? ?if(temp==key_table[i])
?? ??? ??? ??? ??? ?{
?? ??? ??? ??? ??? ??? ?break;
?? ??? ??? ??? ??? ?}
?? ??? ??? ??? ?}
?? ??? ??? ??? ?key_report_val=key_report_val_table[i];?? ??? ??? ?//上報
?? ??? ??? ??? ?key_val=key_report_val;
?? ??? ??? ??? ?input_report_key(kpd_input_dev, key_report_val, 1);
?? ??? ??? ??? ?input_sync(kpd_input_dev);
?? ??? ??? ??? ?input_report_key(kpd_input_dev, key_report_val, 0);
?? ??? ??? ??? ?input_sync(kpd_input_dev);?? ?
?? ??? ??? ?}
?? ??? ??? ?#define GPIO_ENCODER_A_PIN 34//GPIO30
?? ??? ??? ?#define GPIO_ENCODER_B_PIN 35//GPIO31
?? ??? ??? ?#define GPIO_ENCODER_C_PIN 32//GPIO32
?? ??? ??? ?#define GPIO_ENCODER_D_PIN 33//GPIO33
?? ??? ??? ?static void buttons_timer_function(unsigned long data) ?
?? ??? ??? ?{ ?
?? ??? ??? ?unsigned int pinvala=0,pinvalb=0,pinvalc=0,pinvald=0;?
?? ??? ??? ??? ?//讀鍵值
?? ??? ??? ??? ?pinvala = gpio_get_value(GPIO_ENCODER_A_PIN);?

?? ??? ??? ??? ?pinvalb = gpio_get_value(GPIO_ENCODER_B_PIN);?

?? ??? ??? ??? ?pinvalc = gpio_get_value(GPIO_ENCODER_C_PIN);?

?? ??? ??? ??? ?pinvald = gpio_get_value(GPIO_ENCODER_D_PIN);?

?? ??? ??? ??? ?//printk("[ENCODER] buttons_timer_function\n");

?? ??? ??? ??? ?//printk("[ENCODER] pinvala = %d ,pinvalb = %d ,pinvalc = %d ,pinvald = %d \n", pinvala, pinvalb,pinvalc,pinvald);
?? ??? ??? ??? ?pinval = (pinvala|(pinvalb<<1)|(pinvalc<<2)|(pinvald<<3));
?? ??? ??? ??? ?//printk("[ENCODER] pinval = %d \n",pinval);
?? ??? ??? ??? ?//printk("[ENCODER] key_report_val_table = %d ,key_table = %d ?\n", (sizeof(key_report_val_table)/4), (sizeof(key_table)/4));
?? ?
?? ??? ??? ??? ??? ?
?? ??? ??? ??? ??? ?if(pinval!=pinvalold){
?? ??? ??? ??? ??? ??? ?input_report_encoder(pinval);//上報
?? ??? ??? ??? ??? ?}
?? ??? ??? ??? ?pinvalold=pinval;

?? ??? ??? ??? ?mod_timer(&buttons_timer, jiffies + (HZ /5)); ?
?? ??? ??? ??? ?//buttons_timer=jiffies + (HZ /10);
?? ??? ??? ??? ?//add_timer(&buttons_timer);
?? ??? ??? ?} ?

?? ??? ??? ?void encoder_driver_init(void)
?? ??? ??? ?{
?? ??? ??? ??? ?unsigned int i ;
?? ??? ??? ??? ?if((!IS_ERR(zkt_encoder_input0))&(!IS_ERR(zkt_encoder_input1))&(!IS_ERR(zkt_encoder_input2))&(!IS_ERR(zkt_encoder_input3))){
?? ??? ??? ??? ??? ?pinctrl_select_state(zktpinctrl1, zkt_encoder_input0);
?? ??? ??? ??? ??? ?pinctrl_select_state(zktpinctrl1, zkt_encoder_input1);
?? ??? ??? ??? ??? ?pinctrl_select_state(zktpinctrl1, zkt_encoder_input2);
?? ??? ??? ??? ??? ?pinctrl_select_state(zktpinctrl1, zkt_encoder_input3);
?? ??? ??? ??? ?}?? ?
?? ??? ??? ??? ?for(i=0;i<(sizeof(key_report_val_table)/4);i++) //unsigned int 4個字節
?? ??? ??? ??? ?{
?? ??? ??? ??? ??? ?__set_bit(key_report_val_table[i], kpd_input_dev->keybit); //set_bit()告訴input輸入子系統支持哪些事件，哪些按鍵。例如：
?? ??? ??? ??? ?}

?? ??? ??? ??? ?init_timer(&buttons_timer); ?
?? ??? ??? ??? ?buttons_timer.function = buttons_timer_function; ?
?? ??? ??? ??? ?add_timer(&buttons_timer); ?

?? ??? ??? ??? ?/* 修改定時器定時時間，定時10ms，即10秒后啟動定時器?
?? ??? ??? ??? ? * HZ 表示100個jiffies，1 jiffies的單位為10ms，即HZ = 100*10ms = 1s?
?? ??? ??? ??? ? * 這里HZ/10即定時100ms?
?? ??? ??? ??? ? */?
?? ??? ??? ??? ?mod_timer(&buttons_timer, jiffies + (HZ /1)); ?

?? ??? ??? ?}
五：調試案例
案例一:?? ?采用外部擴展按鍵 ? 按鍵無反應
?? ?現象: 所有按鍵無反應
?? ?平臺: android6.0,MTK6737M
?? ?步驟:?
?? ??? ?1.1 查看dws .配置正確
?? ??? ?1.2 查看input注冊
?? ??? ??? ?getevent -i /dev/input/event0
?? ??? ??? ?有注冊?
?? ??? ?1.3 查看input設備上報
?? ??? ??? ?getevent -l /dev/input/event0
?? ??? ??? ?無上報
?? ??? ?1.4 查看input中斷有無觸發?
?? ??? ??? ?cat /proc/interrupts | grep "mtk-kpd"
?? ??? ??? ?無觸發
?? ??? ??? ?
?? ??? ?1.5 查看GPIO 寄存器?
?? ??? ??? ?cat /sys/devices/virtual/misc/mtgpio/pin
?? ??? ??? ?正確
?? ??? ?1.6 按Column鍵觸發 GPIO 寄存器是否有變化
?? ??? ??? ?cat /sys/devices/virtual/misc/mtgpio/pin
?? ??? ??? ?無變化 ，懷疑是硬件問題
?? ??? ?1.7 用萬用表量?? ? Column GPIO 口
?? ??? ??? ?無變化 確定是硬件問題
?? ??? ??? ?
?? ??? ??? ?經硬件檢測，是在Column增加了一個1K限流電阻.在不擴展的的按鍵是正常能電壓變化
?? ??? ??? ?但擴展后， 電壓給限制了，不變化，換0歐電阻，正常。
案例二:?? ?某個按鍵無反應
?? ??? ?現象: 按鍵無反應。
?? ??? ?修改 代碼
?? ??? ??? ?static int kpd_pdrv_probe(struct platform_device *pdev)
?? ??? ??? ?{?? ?
?? ??? ??? ? ...
?? ??? ??? ?+#if 0
?? ??? ??? ?#if defined(CONFIG_KPD_PWRKEY_USE_EINT) || defined(CONFIG_KPD_PWRKEY_USE_PMIC)
?? ??? ??? ??? ?__set_bit(kpd_dts_data.kpd_sw_pwrkey, kpd_input_dev->keybit);
?? ??? ??? ??? ?kpd_keymap[8] = 0;?? ??? ??? ??? ??? ??? ??? ??? ??? ??? ??? ??? ??? ?//會關了支持一些按鍵 正常的都會是9*n都是power鍵
?? ??? ??? ?#endif
?? ??? ??? ??? ?if (!kpd_dts_data.kpd_use_extend_type) {
?? ??? ??? ??? ??? ?for (i = 17; i < KPD_NUM_KEYS; i += 9)?? ?/* only [8] works for Power key */
?? ??? ??? ??? ??? ??? ?kpd_keymap[i] = 0;
?? ??? ??? ??? ?}
?? ??? ??? ?+#endif
?? ??? ??? ??? ?for (i = 0; i < KPD_NUM_KEYS; i++) {
?? ??? ??? ??? ??? ?if (kpd_keymap[i] != 0)
?? ??? ??? ??? ??? ??? ?__set_bit(kpd_keymap[i], kpd_input_dev->keybit);
?? ??? ??? ??? ?}
?? ??? ??? ?...
?? ??? ??? ?}
?? ??? ??? ?或者在Column7上不要配置按鍵

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