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发表于 2020-8-17 20:06:49
8128 浏览 0 回复
mt6762/MT6761/MT6771 如何实现插上电池自动开机
[DESCRIPTION]
有些行业应用产品,不需要pwrkey键,而且希望实现插上电池后自动开机
[SOLUTION]
实现该功能需要两个步骤,首先硬件上将pwrkey直接接地,然后在软件设置中去掉长按关机或重启的功能。
下面详述如何在软件中去掉长按关机或重启的功能:
1.请在文件/vendor/mediatek/proprietary/bootable/bootloader/preloader/platform/mt6771/src/drivers/pmic.c中重新定义如下函数:
- void PMIC_enable_long_press_reboot(void)
- {
- pmic_config_interface(PMIC_RG_PWRKEY_RST_EN_ADDR, 0x00, PMIC_RG_PWRKEY_RST_EN_MASK, PMIC_RG_PWRKEY_RST_EN_SHIFT);
- pmic_config_interface(PMIC_RG_HOMEKEY_RST_EN_ADDR, 0x00, PMIC_RG_HOMEKEY_RST_EN_MASK, PMIC_RG_HOMEKEY_RST_EN_SHIFT);
- }
复制代码 2.请在文件/kernel-4.4/drivers/input/keyboard/mediatek/mt6771/hal_kpd.c重新定义如下函数:
- void long_press_reboot_function_setting(void)
- {
- kpd_info("disable mode LPRST\n");
- pmic_set_register_value(PMIC_RG_PWRKEY_RST_EN, 0x00);
- pmic_set_register_value(PMIC_RG_HOMEKEY_RST_EN, 0x00);
- }
复制代码 如果用的是MTK的charger IC,比如MT6370,6371。power key有拉到charger IC的话。还需要将charger IC的长按reboot关闭,关闭的方法:
- <b>1./kernel-4.4/drivers/misc/mediatek/pmic/mt6370/mt6370_pmu_charger.c</b>
- static int mt6370_pmu_charger_probe(struct platform_device *pdev){
- int ret = 0;
- .......................................
- /* Do initial setting */
- ////////////start add /////////////////////////////////////////////////
- dev_err(chg_data->dev, "%s: start MT6370_PMU_REG_CHGPUMP\n", __func__);
- ret = mt6370_pmu_reg_set_bit(chg_data->chip,MT6370_PMU_REG_CHGPUMP, 0xE0);
- if (ret < 0) {
- dev_err(chg_data->dev, "%s: sw init failed\n", __func__);
- goto err_chg_init_setting;
- }
- ret = mt6370_pmu_reg_read(chg_data->chip,MT6370_PMU_REG_CHGPUMP);
- if (ret < 0)
- dev_err(chg_data->dev, "%s: read reg0x2A failed\n",__func__);
- else
- dev_err(chg_data->dev, "%s: reg0x2A = 0x%02X\n",__func__, ret);
- dev_err(chg_data->dev, "%s: end MT6370_PMU_REG_CHGPUMP\n", __func__);
- ////////////end add /////////////////////////////////////////////////
- ret = mt6370_chg_init_setting(chg_data);
- if (ret < 0) {
- dev_err(chg_data->dev, "%s: sw init failed\n", __func__);
- goto err_chg_init_setting;
- }
- ..................................
- }
- <b>2./vendor/mediatek/proprietary/bootable/bootloader/preloader/platform/mtXXXX/src/drivers/mt6370.c</b>
- #ifdef MTK_EXT_CHGDET_SUPPORT
- int mtk_ext_chgdet(CHARGER_TYPE *chg_type)
- {
- int ret = 0, i = 0;
- const int max_retry_cnt = 5;
- unsigned char usb_status = 0;
- Charger_Detect_Init();
- *chg_type = CHARGER_UNKNOWN;
- + mt6370_set_bit(0x2A,0x80);
- /* Toggle chgdet flow */
- ret = mt6370_enable_chgdet_flow(false);
- if (ret != I2C_OK)
- goto out;
- ret = mt6370_enable_chgdet_flow(true);
- if (ret != I2C_OK)
- goto out;
- ...
复制代码
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