https://blog.youkuaiyun.com/mcgrady_tracy/article/details/52818100
NTC 那是當作電池的溫度偵測用， 通常 NTC 是要包裝在電池內部。但是有些電池沒有 NTC，所以就需要外掛 NTC 放置於電池附近去偵測電池溫度。
如果直接使用外部電源而且沒有充電功能，基本上 NTC 是可以拿掉。(但是軟件人員要會改 MTK 的程序代碼，否則會開不機或是其他問題出現)
手机里面电池通常有4个引脚，即电池的+、-极，ID引脚、NTC引脚。
ID引脚用来识别电池的类型，例如是锂电池还是镍氢电池，不过现在手机上基本用的都是锂电池了。
NTC引脚主要用来测量电池温度的，还可以用来检测手机有没有接上电池
PL启动流程：
main
struct bldr_command_handler handler;
->bldr_pre_process //main.c
->platform_pre_init //platform.c
->mtk_timer_init(); //timer.c
->mt_pll_init(); //pll.c
->mtk_uart_init(UART_SRC_CLK_FRQ, CFG_LOG_BAUDRATE); //uart.c CFG_LOG_BAUDRATE :=921600 in default.mak
->mt_gpio_init(); //gpio.c
->i2c_hw_init(); //i2c.c
->pmic_init //pmic.c、pmic_mt6392.c
->pmic_DetectVbatDrop();
->U32 just_rst=0;
->pmic_read_interface( MT6350_PMIC_JUST_PWRKEY_RST_ADDR, (&just_rst), MT6350_PMIC_JUST_PWRKEY_RST_MASK, MT6350_PMIC_JUST_PWRKEY_RST_SHIFT );
->pmic_config_interface(MT6350_PMIC_CLR_JUST_RST_ADDR, 1, MT6350_PMIC_CLR_JUST_RST_MASK, MT6350_PMIC_CLR_JUST_RST_SHIFT);
->if(just_rst) //用这个来判断是normal，还是force reset
vbat_status = PMIC_VBAT_DROP; //force reset
->else
vbat_status = PMIC_VBAT_NOT_DROP; //normal
->hw_check_battery //pmic.c mt8321 only
->FCHR_ENB init //add for FCHR mt8321 only
->g_boot_mode = NORMAL_BOOT; //初始值
->platform_init
->rtc_init(); //rtc.c mt8168 only
->pmic_init_setting(); //pmic_initial_setting.c mt8168 only
->pl_battery_init(false); //battery.c mt8168 only
->fuel_gauge_init(); //battery.c mt8168 only
->if (hw_check_battery() == 1) //charging_bat.c mt8168 only battery exists
->pl_check_bat_protect_status() //charging_bat.c mt8168 only
->while (bat_val < BATTERY_LOWVOL_THRESOLD) //charging_bat.c mt8168 only #define BATTERY_LOWVOL_THRESOLD 3300
->pchr_turn_on_charging(KAL_TRUE); //charging_bat.c mt8168 only PL充电
->mtk_wdt_init(); //wdt.c init watch dog, will enable AP watch dog
->Dump RGU regisers
->mtk_wdt_check_trig_reboot_reason();
->mtk_wdt_boot_check(); //wdt.c check bypass power key info
->set_kpd_pmic_mode(); //mtk_key.c init kpd PMIC mode support
->g_boot_reason = reason = platform_boot_status() //platform.c
->rtc_boot_check() //rtc.c start of platform_boot_status()
->#if RTC_2SEC_REBOOT_ENABLE
->rtc_save_2sec_stat(); //rtc.c
->rtc_2sec_stat_clear(); //rtc.c
->g_rtc_2sec_stat = false/true;
->#endif
->if ... return BR_RTC/BR_WDT/BR_WDT_BY_PASS_PWK
->if (mtk_detect_key(PL_PMIC_PWR_KEY) && hw_check_battery()) //keypad.c & pmic.c(8321)、pmic_mt6392.c(8167) 8168：if (mtk_detect_key(PL_PMIC_PWR_KEY)) {
->rtc_mark_bypass_pwrkey(); //rtc.c
->return BR_POWER_KEY;
->if (usb_accessory_in()) //platform.c
->if (PMIC_CHRDET_EXIST == pmic_IsUsbCableIn()) //start of usb_accessory_in()
->pmic_read_interface( (U32)(PMIC_RGS_CHRDET_ADDR), (&val), (U32)(PMIC_RGS_CHRDET_MASK), (U32)(PMIC_RGS_CHRDET_SHIFT) //pmic_IsUsbCableIn()相当于upmu_is_chr_det()
->exist = 1;
#if !CFG_USBIF_COMPLIANCE
->platform_set_chrg_cur(450); //platform.c enable charging current as early as possible to avoid can't enter following battery charging flow when low battery
->hw_set_cc(ma); //pmic.c、pmic_6392.c、charging_bat.c
#endif
->return exist; //end of usb_accessory_in()
->return BR_USB //USB/charger boot
->if (rtc_2sec_reboot_check()) //rtc.c
#if RTC_2SEC_REBOOT_ENABLE
return g_rtc_2sec_stat;
#else
return false;
#endif
->return BR_2SEC_REBOOT;
->pl_power_off(); //rtc.c Unknown boot 如果前面都没return，那么将跑到这里，强制关机
->rtc_bbpu_power_down() //rtc.c end of platform_boot_status()
->if (reason == BR_RTC || reason == BR_POWER_KEY || reason == BR_USB || reason == BR_WDT || reason ==BR_WDT_BY_PASS_PWK || reason == BR_2SEC_REBOOT) //mt8321 only
->rtc_bbpu_power_on(); //rtc.c mt8321 mt8167 mt8168
->mt_mem_init(); //memory.c init memory
->mt_set_emi //emi.c
->init_dram_buffer();
->ram_console_init();
->ram_console_reboot_reason_save(g_rgu_status);
->boot_device_init(); //platform.c init device storage end of platform_init()
->bldr_handshake(&handler);
->#ifdef MTK_SECURITY_SW_SUPPORT
->mode = seclib_brom_meta_mode(); //get mode type 找不到定义，不开源
->isSBC = seclib_sbc_enabled(); //找不到定义，不开源
->#endif
->switch (mode) { case NORMAL_BOOT:
->#if CFG_USB_TOOL_HANDSHAKE //yes
->if (TRUE == usb_handshake(handler)) //handshake_usb.c //这里可以设置force_download
->uint32 enum_tmo = CFG_USB_ENUM_TIMEOUT_EN ? USB_ENUM_TIMEOUT : 0; //start of usb_handshake()
->if (usb_connect(enum_tmo) == FALSE) { //handshake_usb.c
->if (enum_tmo) { //start of usb_connect()
->ulong start_time = get_timer(0);
->if (get_timer(start_time) > i * 1000) { //cable plugged-out and power key detection each 1 second
->if (!usb_accessory_in() && !pmic_detect_powerkey()) //如果USB没有插入，并且也不是power key press，强制关机
->pl_power_off(); //end of usb_connect() /* ret = pmic_read_interface((U32)(PMIC_PWRKEY_DEB_ADDR), (&val), (U32)(PMIC_PWRKEY_DEB_MASK), (U32)(PMIC_PWRKEY_DEB_SHIFT)); */
->print("%s USB enum timeout!\n", MOD); goto end; //end of usb_handshake()
->g_meta_com_type = META_USB_COM;
->#endif
->case META_BOOT/FACTORY_BOOT/FACTORY_BOOT/ADVMETA_BOOT/ATE_FACTORY_BOOT:
->if(!usb_cable_in())
->if ((g_boot_reason == BR_USB) || usb_accessory_in()) { //start of usb_cable_in()
->ret = mt_charger_type_detection();
->if (ret == STANDARD_HOST || ret == CHARGING_HOST) {
->mt_usb_phy_poweron();
->mt_usb_phy_savecurrent();
->exist = 1;
->} else if (ret == NONSTANDARD_CHARGER || ret == STANDARD_CHARGER) {
->#if CFG_USBIF_COMPLIANCE //not defined
->platform_set_chrg_cur(450);
->#endif
->return exist; //end of usb_cable_in()
//end of bldr_handshake()
->bldr_post_process
->platform_post_init
->#if CFG_BATTERY_DETECT //这个似乎没有定义
->if (g_boot_mode == NORMAL_BOOT && !hw_check_battery() && usb_accessory_in()) {
->pl_close_pre_chr_led(); //pmic.c、pmic_mt6392.c、charging_bat.c disable pmic pre-charging led
->pl_charging(1); //pmic.c、pmic_mt6392.c、charging_bat.c enable force charging mode
->do { mdelay(300); if (hw_check_battery()){break;}platform_wdt_all_kick();} while(1); //check battery exists or not & kick all watchdogs
->pl_charging(0); //end of platform_post_init()
->#endif
/vendor/mediatek/proprietary/bootable/bootloader/preloader/platform/mt8167/src/drivers/inc/upmu_hw.h
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39 | #define MT6392_PMIC_REG_BASE (0x0000)
#define MT6392_CHR_CON0 ((UINT32)(MT6392_PMIC_REG_BASE+0x0000))
#define MT6392_CHR_CON3 ((UINT32)(MT6392_PMIC_REG_BASE+0x0006))
#define MT6392_CHR_CON4 ((UINT32)(MT6392_PMIC_REG_BASE+0x0008))
#define MT6392_CHR_CON7 ((UINT32)(MT6392_PMIC_REG_BASE+0x000E))
#define MT6392_PMIC_RG_CHR_EN_ADDR MT6392_CHR_CON0 //充电使能脚,还需配合其它寄存器使用
#define MT6392_PMIC_RG_CHR_EN_MASK 0x1
#define MT6392_PMIC_RG_CHR_EN_SHIFT 4
#define MT6392_PMIC_RGS_CHRDET_ADDR MT6392_CHR_CON0 //充电器检测脚
#define MT6392_PMIC_RGS_CHRDET_MASK 0x1
#define MT6392_PMIC_RGS_CHRDET_SHIFT 5
#define MT6392_PMIC_RG_VBAT_CV_VTH_ADDR MT6392_CHR_CON3 //恒压充电电压
#define MT6392_PMIC_RG_VBAT_CV_VTH_MASK 0x1F
#define MT6392_PMIC_RG_VBAT_CV_VTH_SHIFT 0
#define MT6392_PMIC_RG_CS_VTH_ADDR MT6392_CHR_CON4 //充电电流
#define MT6392_PMIC_RG_CS_VTH_MASK 0xF
#define MT6392_PMIC_RG_CS_VTH_SHIFT 0
#define MT6392_PMIC_RG_BATON_EN_ADDR MT6392_CHR_CON7 //电池检测总开关
#define MT6392_PMIC_RG_BATON_EN_MASK 0x1
#define MT6392_PMIC_RG_BATON_EN_SHIFT 0
#define MT6392_PMIC_RG_BATON_HT_EN_ADDR MT6392_CHR_CON7 //HW高温检测开关
#define MT6392_PMIC_RG_BATON_HT_EN_MASK 0x1
#define MT6392_PMIC_RG_BATON_HT_EN_SHIFT 1
#define MT6392_PMIC_BATON_TDET_EN_ADDR MT6392_CHR_CON7 //温度检测开关，应该是打开了这个，BATON ADC才生效
#define MT6392_PMIC_BATON_TDET_EN_MASK 0x1
#define MT6392_PMIC_BATON_TDET_EN_SHIFT 2
#define MT6392_PMIC_RG_BATON_HT_TRIM_ADDR MT6392_CHR_CON7
#define MT6392_PMIC_RG_BATON_HT_TRIM_MASK 0x7
#define MT6392_PMIC_RG_BATON_HT_TRIM_SHIFT 4
#define MT6392_PMIC_RG_BATON_HT_TRIM_SET_ADDR MT6392_CHR_CON7
#define MT6392_PMIC_RG_BATON_HT_TRIM_SET_MASK 0x1
#define MT6392_PMIC_RG_BATON_HT_TRIM_SET_SHIFT 7
#define MT6392_PMIC_RGS_BATON_UNDET_ADDR MT6392_CHR_CON7 //电池检测，0：存在，1:不存在
#define MT6392_PMIC_RGS_BATON_UNDET_MASK 0x1
#define MT6392_PMIC_RGS_BATON_UNDET_SHIFT 12 |
1.电池检测
电池的NTC引脚需要接到MT6350的BATON引脚上，preloader中的检测代码如下：
/vendor/mediatek/proprietary/bootable/bootloader/preloader/platform/mt6580/src/drivers/pmic.c
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34 | int hw_check_battery(void)
{
#ifndef MTK_DISABLE_POWER_ON_OFF_VOLTAGE_LIMITATION
U32 ret_val;
U32 reg_val=0;
ret_val=pmic_config_interface(MT6350_CHR_CON7,0x01, MT6350_PMIC_RG_BATON_EN_MASK, MT6350_PMIC_RG_BATON_EN_SHIFT); //BATON_EN=1
ret_val=pmic_config_interface(MT6350_CHR_CON7, 0x01, MT6350_PMIC_BATON_TDET_EN_MASK, MT6350_PMIC_BATON_TDET_EN_SHIFT); //BATON_TDET_EN=1
ret_val=pmic_read_interface(MT6350_CHR_CON7,®_val, MT6350_PMIC_RGS_BATON_UNDET_MASK, MT6350_PMIC_RGS_BATON_UNDET_SHIFT); //电池检测，0：存在，1:不存在
if (reg_val == 1)
{
print("No Battery\n");
ret_val=pmic_read_interface(MT6350_CHR_CON7,®_val,0xFFFF,0x0);
print("[0x%x]=0x%x\n",MT6350_CHR_CON7,reg_val);
return 0;
}
else
{
print("Battery exist\n");
ret_val=pmic_read_interface(MT6350_CHR_CON7,®_val,0xFF,0x0);
print("[0x%x]=0x%x\n",MT6350_CHR_CON7,reg_val);
pl_hw_ulc_det();
return 1;
}
#else
return 1;
#endif
} |
如果需要去掉电池检测，则在preloader和ProjectConfig配置：MTK_DISABLE_POWER_ON_OFF_VOLTAGE_LIMITATION = yes
KernelConfig配置：CONFIG_MTK_DISABLE_POWER_ON_OFF_VOLTAGE_LIMITATION=y
2.电池温度检测
电池的温度也是通过NTC引脚来测量的，如果去掉电池检测，那么温度检测也会去掉
温度检测的等效电路如下：
其中10k(25℃)是一个温敏电阻，随着温度的升高，阻值降低，一般电池厂商会提供一个温度与阻值的曲线图，通过测量baton的电压值计算出阻值，然后根据阻值曲线计算出温度值，这就是温度测量的原理。
NTC阻值曲线如下(tb8321p2_bsp_bat_setting.dtsi/mt_battery_meter_table.h)：
上拉参考电压为PMIC TREF提供的1.8v，通过计算可以得到在25℃(即10Khm)下，baton电压值大概为0.669v
/kernel-4.9-lc/drivers/misc/mediatek/include/mt-plat/mt6580/include/mach/mt_battery_meter_table.h
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57 | #define BAT_NTC_10 1
#define BAT_NTC_47 0
#if (BAT_NTC_10 == 1)
#define RBAT_PULL_UP_R 16900
#define RBAT_PULL_DOWN_R 27000
#endif
#if (BAT_NTC_47 == 1)
#define RBAT_PULL_UP_R 61900
#define RBAT_PULL_DOWN_R 100000
#endif
#define RBAT_PULL_UP_VOLT 1800
#if (BAT_NTC_10 == 1)
BATT_TEMPERATURE Batt_Temperature_Table[] = {
{-20, 68237},
{-15, 53650},
{-10, 42506},
{ -5, 33892},
{ 0, 27219},
{ 5, 22021},
{ 10, 17926},
{ 15, 14674},
{ 20, 12081},
{ 25, 10000},
{ 30, 8315},
{ 35, 6948},
{ 40, 5834},
{ 45, 4917},
{ 50, 4161},
{ 55, 3535},
{ 60, 3014}
};
#endif
#if (BAT_NTC_47 == 1)
BATT_TEMPERATURE Batt_Temperature_Table[] = {
{-20, 483954},
{-15, 360850},
{-10, 271697},
{ -5, 206463},
{ 0, 158214},
{ 5, 122259},
{ 10, 95227},
{ 15, 74730},
{ 20, 59065},
{ 25, 47000},
{ 30, 37643},
{ 35, 30334},
{ 40, 24591},
{ 45, 20048},
{ 50, 16433},
{ 55, 13539},
{ 60, 11210}
};
#endif |
我们来看一下代码：
如果是使用dts，那么需要重新获取NTC温度与阻值关系，否则直接使用.h默认值
battery_probe->batt_meter_init_cust_data->__batt_meter_init_cust_data_from_dt
/kernel-4.9-lc/drivers/misc/mediatek/include/mt-plat/battery_meter.h
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4 | typedef struct {
signed int BatteryTemp;
signed int TemperatureR;
} BATT_TEMPERATURE; |
/kernel-4.9-lc/drivers/power/supply/mediatek/battery_meter.c
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33 | int __batt_meter_init_cust_data_from_dt(void)
{
#if (BAT_NTC_10 == 1)
batt_meter_cust_data.bat_ntc = 10;
#elif (BAT_NTC_47 == 1)
batt_meter_cust_data.bat_ntc = 47;
#endif
#if defined(RBAT_PULL_UP_R)
batt_meter_cust_data.rbat_pull_up_r = RBAT_PULL_UP_R;
#endif
#if defined(RBAT_PULL_UP_VOLT)
batt_meter_cust_data.rbat_pull_up_volt = RBAT_PULL_UP_VOLT;
#endif
...
__batt_meter_parse_node(np, "batt_temperature_table_num", &num);
idx = 0;
while (!of_property_read_u32_index(np, "batt_temperature_table", idx, &addr)) {
idx++;
if (!of_property_read_u32_index(np, "batt_temperature_table", idx, &val)) {
battery_log(BAT_LOG_CRTI, "batt_temperature_table: addr: %d, val: %d\n",
addr, val);
}
Batt_Temperature_Table[idx / 2].BatteryTemp = addr;
Batt_Temperature_Table[idx / 2].TemperatureR = val;
idx++;
if (idx >= num * 2)
break;
}
...
} |
获取电池温度函数如下：
battery_meter_get_battery_temperature
->force_get_tbat(KAL_TRUE)
->battery_meter_ctrl(BATTERY_METER_CMD_GET_ADC_V_BAT_TEMP, &bat_temperature_volt) //获取ADC电压
->BattVoltToTemp(bat_temperature_volt)
->... //根据串并联电阻分压，计算得到热敏电阻阻值TRes
->sBaTTMP = BattThermistorConverTemp((int)TRes) //查表，根据阻值换算温度
/kernel-4.9-lc/drivers/power/supply/mediatek/battery_meter.c
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15 | signed int battery_meter_get_battery_temperature(void)
{
#ifdef MTK_BATTERY_LIFETIME_DATA_SUPPORT //NO
signed int batt_temp = force_get_tbat(KAL_TRUE);
if (batt_temp > gFG_max_temperature)
gFG_max_temperature = batt_temp;
if (batt_temp < gFG_min_temperature)
gFG_min_temperature = batt_temp;
return batt_temp;
#else
return force_get_tbat(KAL_TRUE);
#endif
} |
/kernel-4.9-lc/drivers/power/supply/mediatek/battery_meter.c
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71 | int force_get_tbat(kal_bool update)
{
#if defined(CONFIG_POWER_EXT) || defined(FIXED_TBAT_25)
bm_print(BM_LOG_CRTI, "[force_get_tbat] fixed TBAT=25 t\n");
return 25;
#else
int bat_temperature_volt = 0;
int bat_temperature_val = 0;
static int pre_bat_temperature_val = -1;
int fg_r_value = 0;
signed int fg_current_temp = 0;
kal_bool fg_current_state = KAL_FALSE;
int bat_temperature_volt_temp = 0;
int ret = 0;
if (batt_meter_cust_data.fixed_tbat_25) {
bm_print(BM_LOG_CRTI, "[force_get_tbat] fixed TBAT=25 t\n");
return 25;
}
if (update == KAL_TRUE || pre_bat_temperature_val == -1) {
/* Get V_BAT_Temperature */
bat_temperature_volt = 2;
ret = /* 获取BATON的adc电压 */
battery_meter_ctrl(BATTERY_METER_CMD_GET_ADC_V_BAT_TEMP, &bat_temperature_volt);
if (bat_temperature_volt != 0) {
#if defined(SOC_BY_HW_FG) //NO
fg_r_value = get_r_fg_value();
ret =
battery_meter_ctrl(BATTERY_METER_CMD_GET_HW_FG_CURRENT,
&fg_current_temp);
ret =
battery_meter_ctrl(BATTERY_METER_CMD_GET_HW_FG_CURRENT_SIGN,
&fg_current_state);
fg_current_temp = fg_current_temp / 10;
if (fg_current_state == KAL_TRUE) {
bat_temperature_volt_temp = bat_temperature_volt;
bat_temperature_volt =
bat_temperature_volt - ((fg_current_temp * fg_r_value) / 1000);
} else {
bat_temperature_volt_temp = bat_temperature_volt;
bat_temperature_volt =
bat_temperature_volt + ((fg_current_temp * fg_r_value) / 1000);
}
#endif
bat_temperature_val = BattVoltToTemp(bat_temperature_volt);
}
#ifdef CONFIG_MTK_BIF_SUPPORT
battery_charging_control(CHARGING_CMD_GET_BIF_TBAT, &bat_temperature_val);
#endif
bm_print(BM_LOG_CRTI, "[force_get_tbat] %d,%d,%d,%d,%d,%d\n",
bat_temperature_volt_temp, bat_temperature_volt, fg_current_state,
fg_current_temp, fg_r_value, bat_temperature_val);
pre_bat_temperature_val = bat_temperature_val;
if (bat_temperature_val > 55)
pr_notice("[force_get_tbat] %d,%d,%d,%d,%d,%d\n",
bat_temperature_volt_temp, bat_temperature_volt, fg_current_state,
fg_current_temp, fg_r_value, bat_temperature_val);
} else {
bat_temperature_val = pre_bat_temperature_val;
}
return bat_temperature_val;
#endif
}
EXPORT_SYMBOL(force_get_tbat); |
/kernel-4.9-lc/drivers/misc/mediatek/power/mt6580/battery_meter_hal.c
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4 | signed int bm_ctrl_cmd(BATTERY_METER_CTRL_CMD cmd, void *data)
bm_func[BATTERY_METER_CMD_GET_ADC_V_BAT_TEMP] = read_adc_v_bat_temp
... ...
} |
/kernel-4.9-lc/drivers/misc/mediatek/include/mt-plat/mt6580/include/mach/upmu_sw.h
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22 | /* ADC Channel Number */
typedef enum {
/* MT6350 */
MT6350_AUX_BATON2 = 0x000,
MT6350_AUX_CH6,
MT6350_AUX_THR_SENSE2,
MT6350_AUX_THR_SENSE1,
MT6350_AUX_VCDT,
MT6350_AUX_BATON1,
MT6350_AUX_ISENSE,
MT6350_AUX_BATSNS,
MT6350_AUX_ACCDET,
MT6350_AUX_CH9,
MT6350_AUX_CH10,
MT6350_AUX_CH11,
MT6350_AUX_CH12,
MT6350_AUX_CH13,
MT6350_AUX_CH14,
MT6350_AUX_CH15,
MT6350_AUX_CH16,
} pmic_adc_ch_list_enum; |
/kernel-4.9-lc/drivers/misc/mediatek/power/mt6580/battery_meter_hal.c
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38 | static signed int read_adc_v_bat_temp(void *data)
{
#if defined(CONFIG_POWER_EXT)
*(signed int *)(data) = 0;
#else
#if defined(MTK_PCB_TBAT_FEATURE) //no
int ret = 0, data[4], i, ret_value = 0, ret_temp = 0;
int Channel = 1;
if (IMM_IsAdcInitReady() == 0) {
bm_print(BM_LOG_CRTI, "[get_tbat_volt] AUXADC is not ready");
return 0;
}
i = times;
while (i--) {
ret_value = IMM_GetOneChannelValue(Channel, data, &ret_temp);
ret += ret_temp;
bm_print(BM_LOG_FULL, "[get_tbat_volt] ret_temp=%d\n", ret_temp);
}
ret = ret * 1500 / 4096;
ret = ret / times;
bm_print(BM_LOG_CRTI, "[get_tbat_volt] Battery output mV = %d\n", ret);
*(signed int *)(data) = ret;
#else
bm_print(BM_LOG_FULL,
"[read_adc_v_charger] return PMIC_IMM_GetOneChannelValue(4,times,1);\n");
*(signed int *)(data) =
PMIC_IMM_GetOneChannelValue(MT6350_AUX_BATON1, *(signed int *)(data), 1); //参数data没用到，返回值才是ADC电压
#endif
#endif
return STATUS_OK;
} |
PS：PL和LK阶段获取ADC也是int PMIC_IMM_GetOneChannelValue(int dwChannel, int deCount, int trimd)
KERNEL的参数deCount没有任何作用，但PL和LK的参数deCount为获取的次数，比如deCount为5，那就是连续获取5次，最后返回5次的平均值
另外，对于其他平台(比如MT8768/MT8788)
KERNEL用int iio_read_channel_processed(struct iio_channel *chan, int *val)
PL和LK是使用int pmic_get_auxadc_value(PMIC_AUXADC_LIST list)
获取到ADC电压后，然后调用BattVoltToTemp，得到RNTC的阻值
/kernel-4.9-lc/drivers/power/supply/mediatek/battery_meter.c
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37 | int BattVoltToTemp(int dwVolt)
{
long long TRes_temp;
long long TRes;
int sBaTTMP = -100;
/* 根据串联分压，计算下半部分电阻阻值TRes_temp*/
/* TRes_temp = ((long long)RBAT_PULL_UP_R*(long long)dwVolt) / (RBAT_PULL_UP_VOLT-dwVolt); */
/* 如果下半部分只有一个电阻，那么TRes_temp就是热敏电阻阻值 */
/* 如果热敏电阻并联了一个下拉电阻，那么通过计算得到热敏电阻阻值TRes */
/* TRes = (TRes_temp * (long long)RBAT_PULL_DOWN_R)/((long long)RBAT_PULL_DOWN_R - TRes_temp); */
TRes_temp = (batt_meter_cust_data.rbat_pull_up_r * (long long) dwVolt);
#if defined(__LP64__) || defined(_LP64)
do_div(TRes_temp, (batt_meter_cust_data.rbat_pull_up_volt - dwVolt));
#else
TRes_temp = div_s64(TRes_temp, (batt_meter_cust_data.rbat_pull_up_volt - dwVolt));
#endif
#ifdef RBAT_PULL_DOWN_R
TRes = (TRes_temp * RBAT_PULL_DOWN_R);
#if defined(__LP64__) || defined(_LP64)
do_div(TRes, abs(RBAT_PULL_DOWN_R - TRes_temp));
#else
TRes = div_s64(TRes, abs(RBAT_PULL_DOWN_R - TRes_temp));
#endif
#else
TRes = TRes_temp;
#endif
/* convert register to temperature */
sBaTTMP = BattThermistorConverTemp((int)TRes);
return sBaTTMP;
} |
TRes为计算得到的阻值，然后通过BattThermistorConverTemp，转换为对应温度：
/kernel-4.9-lc/drivers/power/supply/mediatek/battery_meter.c
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31 | int BattThermistorConverTemp(int Res)
{
int i = 0;
int RES1 = 0, RES2 = 0;
int TBatt_Value = -200, TMP1 = 0, TMP2 = 0;
if (Res >= Batt_Temperature_Table[0].TemperatureR) {
TBatt_Value = -20;
} else if (Res <= Batt_Temperature_Table[16].TemperatureR) {
TBatt_Value = 60;
} else {
RES1 = Batt_Temperature_Table[0].TemperatureR;
TMP1 = Batt_Temperature_Table[0].BatteryTemp;
for (i = 0; i <= 16; i++) {
if (Res < Batt_Temperature_Table[i].TemperatureR) {
RES1 = Batt_Temperature_Table[i].TemperatureR; //RES1是比Res大，且Batt_Temperature_Table数组里最接近Res的阻值
TMP1 = Batt_Temperature_Table[i].BatteryTemp;
} else {
RES2 = Batt_Temperature_Table[i].TemperatureR; //RES2是比Res小，且Batt_Temperature_Table数组里最接近Res的阻值
TMP2 = Batt_Temperature_Table[i].BatteryTemp;
break;
}
}
/* 也就是说 RES1>Res>Res2, 通过计算得到Res对应的温度TBatt_Value */
TBatt_Value = (((Res - RES2) * TMP1) + ((RES1 - Res) * TMP2)) / (RES1 - RES2);
}
return TBatt_Value;
} |
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