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usb: limit the current to 1.3A when connect to accessory

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For imporve USB stability, limit the current to 1.3A,
when connect to accessory.

Bug: 206635552
Signed-off-by: Ricky Niu <rickyniu@google.com>
Change-Id: I2c1091aa7111e6242cc949923fbc86f27e54e976
This commit is contained in:
Ricky Niu 2022-05-09 10:14:20 +08:00 • committed by TreeHugger Robot
parent 5c0cb06ff7
commit ebd7fca53a
3 changed files with 82 additions and 0 deletions
Download patch file Download diff file Expand all files Collapse all files

59
usb/gadget/UsbGadget.cpp
View file

@ -33,6 +33,12 @@ namespace gadget {
namespace V1_2 {
namespace implementation {
string enabledPath;
constexpr char kHsi2cPath[] = "/sys/devices/platform/10d50000.hsi2c";
constexpr char kI2CPath[] = "/sys/devices/platform/10d50000.hsi2c/i2c-";
constexpr char kAccessoryLimitCurrent[] = "i2c-max77759tcpc/usb_limit_accessory_current";
constexpr char kAccessoryLimitCurrentEnable[] = "i2c-max77759tcpc/usb_limit_accessory_enable";
UsbGadget::UsbGadget() : mGadgetIrqPath("") {
if (access(OS_DESC_PATH, R_OK) != 0) {
ALOGE("configfs setup not done yet");
@ -380,14 +386,45 @@ V1_0::Status UsbGadget::setupFunctions(uint64_t functions,
return Status::SUCCESS;
}
Status getI2cBusHelper(string *name) {
DIR *dp;
dp = opendir(kHsi2cPath);
if (dp != NULL) {
struct dirent *ep;
while ((ep = readdir(dp))) {
if (ep->d_type == DT_DIR) {
if (string::npos != string(ep->d_name).find("i2c-")) {
std::strtok(ep->d_name, "-");
*name = std::strtok(NULL, "-");
}
}
}
closedir(dp);
return Status::SUCCESS;
}
ALOGE("Failed to open %s", kHsi2cPath);
return Status::ERROR;
}
Return<void> UsbGadget::setCurrentUsbFunctions(uint64_t functions,
const sp<V1_0::IUsbGadgetCallback> &callback,
uint64_t timeout) {
std::unique_lock<std::mutex> lk(mLockSetCurrentFunction);
std::string current_usb_power_operation_mode, current_usb_type;
std::string usb_limit_sink_enable;
string accessoryCurrentLimitEnablePath, accessoryCurrentLimitPath, path;
mCurrentUsbFunctions = functions;
mCurrentUsbFunctionsApplied = false;
getI2cBusHelper(&path);
accessoryCurrentLimitPath = kI2CPath + path + "/" + kAccessoryLimitCurrent;
accessoryCurrentLimitEnablePath = kI2CPath + path + "/" + kAccessoryLimitCurrentEnable;
// Get the gadget IRQ number before tearDownGadget()
if (mGadgetIrqPath.empty())
getUsbGadgetIrqPath();
@ -435,6 +472,28 @@ Return<void> UsbGadget::setCurrentUsbFunctions(uint64_t functions,
}
}
if (ReadFileToString(CURRENT_USB_TYPE_PATH, &current_usb_type))
current_usb_type = Trim(current_usb_type);
if (ReadFileToString(CURRENT_USB_POWER_OPERATION_MODE_PATH, &current_usb_power_operation_mode))
current_usb_power_operation_mode = Trim(current_usb_power_operation_mode);
if (functions & GadgetFunction::ACCESSORY &&
current_usb_type == "Unknown SDP [CDP] DCP" &&
(current_usb_power_operation_mode == "default" ||
current_usb_power_operation_mode == "1.5A")) {
if (!WriteStringToFile("1300000", accessoryCurrentLimitPath)) {
ALOGI("Write 1.3A to limit current fail");
} else {
if (!WriteStringToFile("1", accessoryCurrentLimitEnablePath)) {
ALOGI("Enable limit current fail");
}
}
} else {
if (!WriteStringToFile("0", accessoryCurrentLimitEnablePath))
ALOGI("unvote accessory limit current failed");
}
ALOGI("Usb Gadget setcurrent functions called successfully");
return Void();

7
usb/gadget/UsbGadget.h
View file

@ -86,6 +86,13 @@ static MonitorFfs monitorFfs(kGadgetName);
#define BIG_CORE "6"
#define MEDIUM_CORE "4"
#define POWER_SUPPLY_PATH "/sys/class/power_supply/usb/"
#define USB_PORT0_PATH "/sys/class/typec/port0/"
#define CURRENT_MAX_PATH POWER_SUPPLY_PATH "current_max"
#define CURRENT_USB_TYPE_PATH POWER_SUPPLY_PATH "usb_type"
#define CURRENT_USB_POWER_OPERATION_MODE_PATH USB_PORT0_PATH "power_operation_mode"
struct UsbGadget : public IUsbGadget {
UsbGadget();

16
usb/usb/android.hardware.usb-service.rc
View file

@ -12,6 +12,14 @@ on post-fs
chown root system /sys/devices/platform/10d50000.hsi2c/i2c-6/i2c-max77759tcpc/contaminant_detection
chown root system /sys/devices/platform/10d50000.hsi2c/i2c-7/i2c-max77759tcpc/contaminant_detection
chown root system /sys/devices/platform/10d50000.hsi2c/i2c-8/i2c-max77759tcpc/contaminant_detection
chown root system /sys/devices/platform/10d50000.hsi2c/i2c-5/i2c-max77759tcpc/usb_limit_accessory_current
chown root system /sys/devices/platform/10d50000.hsi2c/i2c-6/i2c-max77759tcpc/usb_limit_accessory_current
chown root system /sys/devices/platform/10d50000.hsi2c/i2c-7/i2c-max77759tcpc/usb_limit_accessory_current
chown root system /sys/devices/platform/10d50000.hsi2c/i2c-8/i2c-max77759tcpc/usb_limit_accessory_current
chown root system /sys/devices/platform/10d50000.hsi2c/i2c-5/i2c-max77759tcpc/usb_limit_accessory_enable
chown root system /sys/devices/platform/10d50000.hsi2c/i2c-6/i2c-max77759tcpc/usb_limit_accessory_enable
chown root system /sys/devices/platform/10d50000.hsi2c/i2c-7/i2c-max77759tcpc/usb_limit_accessory_enable
chown root system /sys/devices/platform/10d50000.hsi2c/i2c-8/i2c-max77759tcpc/usb_limit_accessory_enable
chown root system /sys/devices/platform/10d50000.hsi2c/i2c-5/i2c-max77759tcpc/usb_limit_sink_current
chown root system /sys/devices/platform/10d50000.hsi2c/i2c-6/i2c-max77759tcpc/usb_limit_sink_current
chown root system /sys/devices/platform/10d50000.hsi2c/i2c-7/i2c-max77759tcpc/usb_limit_sink_current
@ -38,6 +46,14 @@ on post-fs
chmod 664 /sys/devices/platform/10d50000.hsi2c/i2c-6/i2c-max77759tcpc/contaminant_detection
chmod 664 /sys/devices/platform/10d50000.hsi2c/i2c-7/i2c-max77759tcpc/contaminant_detection
chmod 664 /sys/devices/platform/10d50000.hsi2c/i2c-8/i2c-max77759tcpc/contaminant_detection
chmod 664 /sys/devices/platform/10d50000.hsi2c/i2c-5/i2c-max77759tcpc/usb_limit_accessory_current
chmod 664 /sys/devices/platform/10d50000.hsi2c/i2c-6/i2c-max77759tcpc/usb_limit_accessory_current
chmod 664 /sys/devices/platform/10d50000.hsi2c/i2c-7/i2c-max77759tcpc/usb_limit_accessory_current
chmod 664 /sys/devices/platform/10d50000.hsi2c/i2c-8/i2c-max77759tcpc/usb_limit_accessory_current
chmod 664 /sys/devices/platform/10d50000.hsi2c/i2c-5/i2c-max77759tcpc/usb_limit_accessory_enable
chmod 664 /sys/devices/platform/10d50000.hsi2c/i2c-6/i2c-max77759tcpc/usb_limit_accessory_enable
chmod 664 /sys/devices/platform/10d50000.hsi2c/i2c-7/i2c-max77759tcpc/usb_limit_accessory_enable
chmod 664 /sys/devices/platform/10d50000.hsi2c/i2c-8/i2c-max77759tcpc/usb_limit_accessory_enable
chmod 664 /sys/devices/platform/10d50000.hsi2c/i2c-5/i2c-max77759tcpc/usb_limit_sink_current
chmod 664 /sys/devices/platform/10d50000.hsi2c/i2c-6/i2c-max77759tcpc/usb_limit_sink_current
chmod 664 /sys/devices/platform/10d50000.hsi2c/i2c-7/i2c-max77759tcpc/usb_limit_sink_current