RK3399 android7.1 耳机拔插ADC检测

rk3399_android7.1耳机拔插ADC检测 平仄散人

ADC 使用

一.frameworks\base\services\core\java\com\android\server\WiredAccessoryManager.java

?

1 2 3 4 5 6 7 8 9 10 11

private static final String HEADSET_CONNECTION_NODE  =  "/sys/devices/virtual/switch/h2w/state";               public String getDevName() { return mDevName; }               public String getDevPath() {                 return String.format(Locale.US, "/devices/virtual/switch/%s", mDevName);             }               public String getSwitchStatePath() {                 return String.format(Locale.US, "/sys/class/switch/%s/state", mDevName);             }

　　

 二.驱动解析

2.1.dts 配置 

?

1 2 3 4 5 6 7

rockchip_headset {             status = "okay";             compatible = "rockchip_headset";             io-channels = <&saradc 2>;     io-channel-names = "headset";             headset_gpio = <&gpio0 8 GPIO_ACTIVE_LOW>; };

 

2.2.kernel\drivers\headset_observe\rockchip_headset_core.c

ret = of_get_named_gpio_flags(node, "headset_gpio", 0, &flags); //解析gpio
如果解析到gpio就devm_gpio_request //申请GPIO，gpio_direction_input//设置GPIO口为输入状态

of_get_named_gpio_flags(node, "hook_gpio", 0, &pdata->hook_gpio); //解析GPIO
如果解析不到GPIO就 pdata->chan = iio_channel_get(&pdev->dev, NULL); //获取ADC通道

?

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79

static int rockchip_headset_probe(struct platform_device *pdev) {     struct device_node *node = pdev->dev.of_node;     struct rk_headset_pdata *pdata;     int ret,i,val;     //enum of_gpio_flags flags;       pdata = kzalloc(sizeof(struct rk_headset_pdata), GFP_KERNEL);     if (pdata == NULL) {         printk("%s failed to allocate driver data\n",__FUNCTION__);         return -ENOMEM;     }     memset(pdata,0,sizeof(struct rk_headset_pdata));     pdata_info = pdata;       //headset     ret = of_get_named_gpio(node, "headset_gpio", 0);     if (ret < 0) {         printk("%s() Can not read property headset_gpio\n", __FUNCTION__);         goto err;     } else {         pdata->headset_gpio = ret;         ret = devm_gpio_request(&pdev->dev, pdata->headset_gpio, "headset_gpio");         if(ret < 0){             printk("%s() devm_gpio_request headset_gpio request ERROR\n", __FUNCTION__);             goto err;         }           ret = gpio_direction_input(pdata->headset_gpio);         if(ret < 0){             printk("%s() gpio_direction_input headset_gpio set ERROR\n", __FUNCTION__);             goto err;         }           pdata->headset_insert_type = HEADSET_IN_LOW;     }     pdata->chan = iio_channel_get(&pdev->dev, NULL);     if (IS_ERR(pdata->chan))     {             pdata->chan = NULL;             printk("%s() have not set adc chan\n", __FUNCTION__);     }     set_headset_mic_power(1);           for(i = 0;i < 5;i++){         ret = iio_read_channel_raw(pdata->chan, &val);           if (ret < 0)           {                 pr_err("timer_work_callback read adc channel() error: %d\n", ret);           }           msleep(100);              }       printk("eric  222 iio_read_channel_raw = %d \n",val);             if(val > 5)     {         printk("%s() ZK-R39A V1.1\n",__FUNCTION__);         ret = rk_headset_adc_probe(pdev,pdata);         if(ret < 0)         {             goto err;         }         }     else     {         printk("%s() ZK-R39A V1.0\n",__FUNCTION__);         ret = rk_headset_probe(pdev,pdata);         if(ret < 0)         {             goto err;         }     }       return 0; err:     kfree(pdata);     return ret; }

2.3.kernel\drivers\headset_observe\rk_headset_irq_hook_adc.c

读取 AD 采集到的原始数据
int value,Vresult;
ret = iio_read_channel_raw(chan, &value);
调用 iio_read_channel_raw 函数读取 AD 采集的原始数据并存入value变量中

?

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59

static void hook_once_work(struct work_struct *work) {     int ret,val;       #ifdef CONFIG_SND_SOC_WM8994     wm8994_headset_mic_detect(true);     #endif       #if defined (CONFIG_SND_SOC_RT3261) || defined (CONFIG_SND_SOC_RT3224)     rt3261_headset_mic_detect(true);     #endif       #ifdef CONFIG_SND_SOC_RT5631_PHONE     rt5631_headset_mic_detect(true);     #endif     ret = iio_read_channel_raw(headset_info->chan, &val);   if (ret < 0) {         pr_err("read hook_once_work adc channel() error: %d\n", ret);     }else         DBG("hook_once_work read adc value: %d\n",val);       if(val >= 800 && val < 1000)     {         headset_info->isMic= 0;//No microphone         #ifdef CONFIG_SND_SOC_WM8994         wm8994_headset_mic_detect(false);         #endif           #if defined (CONFIG_SND_SOC_RT3261) || defined (CONFIG_SND_SOC_RT3224)         rt3261_headset_mic_detect(false);         #endif            #ifdef CONFIG_SND_SOC_RT5631_PHONE         rt5631_headset_mic_detect(false);         #endif                      }       else if(val >= 550 && val < 750)     {         headset_info->isMic = 1;//four headseet in     }     else if(val >= 5 && val < 100)     {         headset_info->isMic = 1;//three headseet in     }         headset_info->cur_headset_status = headset_info->isMic ? 1:0;       #if defined(CONFIG_SND_SOC_CX2072X)     if (cx2072x_jack_report() != -1)         headset_info->cur_headset_status =             (cx2072x_jack_report() == 3) ?             BIT_HEADSET : BIT_HEADSET_NO_MIC;     #endif           switch_set_state(&headset_info->sdev, headset_info->cur_headset_status);      DBG("%s notice android headset status = %d\n",__func__,headset_info->cur_headset_status);     schedule_delayed_work(&headset_info->h_delayed_work[HOOK],msecs_to_jiffies(500)); }