高通Android平台 耳机按键配置方法

在srclinuxandroidkernelsoundsocMsmMsm8x16.c中

static void *def_msm8x16_wcd_mbhc_cal(void)

{

void *msm8x16_wcd_cal;

struct wcd_mbhc_btn_detect_cfg *btn_cfg;

u16 *btn_low, *btn_high;

msm8x16_wcd_cal = kzalloc(sizeof(struct wcd_mbhc_btn_detect_cfg),

GFP_KERNEL);

if (!msm8x16_wcd_cal) {

pr_err("%s: out of memoryn", __func__);

return NULL;

}

btn_cfg = WCD_MBHC_CAL_BTN_DET_PTR(msm8x16_wcd_cal);

btn_cfg->num_btn = WCD_MBHC_DEF_BUTTONS;

btn_low = btn_cfg->_v_btn_low;

btn_high = btn_cfg->_v_btn_high;

//button 定义，后面是按键偏置电压

btn_low[0] = 0;

btn_high[0] = 25;

btn_low[1] = 25;

btn_high[1] = 50;

btn_low[2] = 50;

btn_high[2] = 75;

btn_low[3] = 75;

btn_high[3] = 112;

btn_low[4] = 112;

btn_high[4] = 137;

return msm8x16_wcd_cal;

}

srclinuxandroidkernelsoundsocCodecsWcd-mbhc-v2.c

int wcd_mbhc_init()

{

//对应前面的btn_low[0]--btn_high[0]，

KEY_MEDIA就是对应耳机挂机按键值

ret = snd_jack_set_key(mbhc->button_jack.jack,

SND_JACK_BTN_0,

KEY_MEDIA);

}

srclinuxandroidkernelincludeuapiLinuxInput.h中定义各种键值

#define KEY_MEDIA 226

button jack 00e2 就是 226