MTK PA 相关 (power amplifier)

最新推荐文章于 2024-08-09 10:20:54 发布

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最新推荐文章于 2024-08-09 10:20:54 发布

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本文详细探讨了MTK平台上的PA（功率放大器）控制，涉及相关文件如audioflinger/audio/audio_custom_exp.h和sound/yusu_android_speaker.c。文中展示了如何通过Sound_Speaker_Turnon和Sound_Speaker_Turnoff函数切换喇叭状态，并提及在Ubuntu环境下grep命令的使用。此外，还介绍了在AudDrv_ioctl函数中如何通过SET_SPEAKER_ON/OFF命令控制PA，并在AudioMachineDevice.cpp中针对音量控制关闭PA以消除底噪的修改方法。

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alps/mediatek/custom/simcom72_wet_jb3/hal/audioflinger/audio/audio_custom_exp.h

alps/mediatek/custom/common/kernel/sound/amp_6323pmic_spk/yusu_android_speaker.c

alps/mediatek/custom/common/kernel/sound/amp_yad/yusu_android_speaker.c

alps/mediatek/custom/common/kernel/sound/amp_aw8733/yusu_android_speaker.c

void Sound_Speaker_Turnon(int channel)
{
    PRINTK("Sound_Speaker_Turnon channel = %d\n",channel);
   if(gsk_on)
       return;
    mt_set_gpio_dir(GPIO_SPEAKER_EN_PIN,GPIO_DIR_OUT); // output
    mt_set_gpio_out(GPIO_SPEAKER_EN_PIN,GPIO_OUT_ONE); // high //mode2
    udelay(2);
    mt_set_gpio_out(GPIO_SPEAKER_EN_PIN,GPIO_OUT_ZERO); // low //mode2
    udelay(2);
    mt_set_gpio_out(GPIO_SPEAKER_EN_PIN,GPIO_OUT_ONE); // high //mode2
    msleep(SPK_WARM_UP_TIME);
    gsk_on = true;
}

void Sound_Speaker_Turnoff(int channel)
{
    PRINTK("Sound_Speaker_Turnoff channel = %d\n",channel);
   if(!gsk_on)
       return;
    mt_set_gpio_dir(GPIO_SPEAKER_EN_PIN,GPIO_DIR_OUT); // output
    mt_set_gpio_out(GPIO_SPEAKER_EN_PIN,GPIO_OUT_ZERO); // high
   gsk_on = false;
}

======================================

ubuntu@ZZ:alps$ grep -nr yusu_android_speaker.h *

bootable/bootloader/lk/platform/mediatek/mt6572/kernel/drivers/sound/AudDrv_Kernel.c:105:#include "yusu_android_speaker.h"

bootable/bootloader/lk/custom/simcom72_wet_jb3/kernel/sound/inc/yusu_android_speaker.h:30: * [ALPS00102848] [Need Patch] [Volunteer Patch] build waring in yusu_android_speaker.h

bootable/bootloader/lk/custom/simcom72_wet_jb3/kernel/sound/yusu_android_speaker.c:22:#include "yusu_android_speaker.h"