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UsbGadget: Update SDP enum timeout when gadget is pulled up

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Indicate to the kernel that the usb gadget is pulled up
by writing to `update_sdp_enum_timeout` sysfs node. Write
to this node will inform the kernel that it can lower the SDP
timeout alarm value which is used to detect an SDP port
vs a DCP.

ported from c5c5b127a7ed0db559d286284fe77b656bef6945

Bug: 275687235
Test: Check `update_sdp_enum_timeout` is written into after usb
      gadget is pulled up. Verify that the alarm timeout lowers.
Change-Id: Id3ae7e7a20b236cec6604414a7f81860e868bdd0
Signed-off-by: Amit Sunil Dhamne <amitsd@google.com>
This commit is contained in:
Amit Sunil Dhamne 2023-09-12 17:53:45 -07:00
parent b2232b52bb
commit ed622856fc
3 changed files with 66 additions and 22 deletions
Download patch file Download diff file Expand all files Collapse all files

64
usb/gadget/UsbGadget.cpp
View file

@ -41,10 +41,34 @@ 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";
constexpr char kUpdateSdpEnumTimeout[] = "i2c-max77759tcpc/update_sdp_enum_timeout";
using ::android::base::GetBoolProperty;
using ::android::hardware::google::pixel::usb::kUvcEnabled;
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;
}
UsbGadget::UsbGadget() : mGadgetIrqPath("") {
if (access(OS_DESC_PATH, R_OK) != 0) {
ALOGE("configfs setup not done yet");
@ -97,6 +121,7 @@ Status UsbGadget::getUsbGadgetIrqPath() {
void currentFunctionsAppliedCallback(bool functionsApplied, void *payload) {
UsbGadget *gadget = (UsbGadget *)payload;
gadget->mCurrentUsbFunctionsApplied = functionsApplied;
gadget->updateSdpEnumTimeout();
}
ScopedAStatus UsbGadget::getCurrentUsbFunctions(const shared_ptr<IUsbGadgetCallback> &callback,
@ -363,6 +388,22 @@ ScopedAStatus UsbGadget::reset(const shared_ptr<IUsbGadgetCallback> &callback,
return ScopedAStatus::ok();
}
void UsbGadget::updateSdpEnumTimeout() {
string i2c_node, update_sdp_enum_timeout_path;
Status status = getI2cBusHelper(&i2c_node);
if (status != Status::SUCCESS) {
ALOGE("%s: Unable to locate i2c bus node", __func__);
}
update_sdp_enum_timeout_path = kI2CPath + i2c_node + "/" + kUpdateSdpEnumTimeout;
if (!WriteStringToFile("1", update_sdp_enum_timeout_path)) {
ALOGE("%s: Unable to write to %s.", __func__, update_sdp_enum_timeout_path.c_str());
} else {
ALOGI("%s: Updated SDP enumeration timeout value.", __func__);
}
}
Status UsbGadget::setupFunctions(long functions,
const shared_ptr<IUsbGadgetCallback> &callback, uint64_t timeout,
int64_t in_transactionId) {
@ -417,6 +458,7 @@ Status UsbGadget::setupFunctions(long functions,
mCurrentUsbFunctionsApplied = true;
if (callback)
callback->setCurrentUsbFunctionsCb(functions, Status::SUCCESS, in_transactionId);
updateSdpEnumTimeout();
return Status::SUCCESS;
}
@ -441,28 +483,6 @@ Status UsbGadget::setupFunctions(long 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;
}
ScopedAStatus UsbGadget::setCurrentUsbFunctions(long functions,
const shared_ptr<IUsbGadgetCallback> &callback,

4
usb/gadget/UsbGadget.h
View file

@ -115,6 +115,10 @@ struct UsbGadget : public BnUsbGadget {
ScopedAStatus setVidPid(const char *vid,const char *pid);
// Indicates to the kernel that the gadget service is ready and the kernel can
// set SDP timeout to a lower value.
void updateSdpEnumTimeout();
private:
Status tearDownGadget();
Status getUsbGadgetIrqPath();

20
usb/usb/android.hardware.usb-service.rc
View file

@ -68,6 +68,16 @@ on post-fs
chown root system /sys/devices/platform/10d50000.hsi2c/i2c-7/i2c-max77759tcpc/usb_limit_source_enable
chown root system /sys/devices/platform/10d50000.hsi2c/i2c-8/i2c-max77759tcpc/usb_limit_source_enable
chown root system /sys/devices/platform/10d50000.hsi2c/i2c-9/i2c-max77759tcpc/usb_limit_source_enable
chown root system /sys/devices/platform/10d50000.hsi2c/i2c-0/i2c-max77759tcpc/update_sdp_enum_timeout
chown root system /sys/devices/platform/10d50000.hsi2c/i2c-1/i2c-max77759tcpc/update_sdp_enum_timeout
chown root system /sys/devices/platform/10d50000.hsi2c/i2c-2/i2c-max77759tcpc/update_sdp_enum_timeout
chown root system /sys/devices/platform/10d50000.hsi2c/i2c-3/i2c-max77759tcpc/update_sdp_enum_timeout
chown root system /sys/devices/platform/10d50000.hsi2c/i2c-4/i2c-max77759tcpc/update_sdp_enum_timeout
chown root system /sys/devices/platform/10d50000.hsi2c/i2c-5/i2c-max77759tcpc/update_sdp_enum_timeout
chown root system /sys/devices/platform/10d50000.hsi2c/i2c-6/i2c-max77759tcpc/update_sdp_enum_timeout
chown root system /sys/devices/platform/10d50000.hsi2c/i2c-7/i2c-max77759tcpc/update_sdp_enum_timeout
chown root system /sys/devices/platform/10d50000.hsi2c/i2c-8/i2c-max77759tcpc/update_sdp_enum_timeout
chown root system /sys/devices/platform/10d50000.hsi2c/i2c-9/i2c-max77759tcpc/update_sdp_enum_timeout
chown root system /sys/devices/platform/11110000.usb/dwc3_exynos_otg_b_sess
chown root system /sys/devices/platform/11110000.usb/dwc3_exynos_otg_id
chown root system /sys/devices/platform/11110000.usb/usb_data_enabled
@ -138,4 +148,14 @@ on post-fs
chmod 664 /sys/devices/platform/10d50000.hsi2c/i2c-7/i2c-max77759tcpc/usb_limit_source_enable
chmod 664 /sys/devices/platform/10d50000.hsi2c/i2c-8/i2c-max77759tcpc/usb_limit_source_enable
chmod 664 /sys/devices/platform/10d50000.hsi2c/i2c-9/i2c-max77759tcpc/usb_limit_source_enable
chmod 664 /sys/devices/platform/10d50000.hsi2c/i2c-0/i2c-max77759tcpc/update_sdp_enum_timeout
chmod 664 /sys/devices/platform/10d50000.hsi2c/i2c-1/i2c-max77759tcpc/update_sdp_enum_timeout
chmod 664 /sys/devices/platform/10d50000.hsi2c/i2c-2/i2c-max77759tcpc/update_sdp_enum_timeout
chmod 664 /sys/devices/platform/10d50000.hsi2c/i2c-3/i2c-max77759tcpc/update_sdp_enum_timeout
chmod 664 /sys/devices/platform/10d50000.hsi2c/i2c-4/i2c-max77759tcpc/update_sdp_enum_timeout
chmod 664 /sys/devices/platform/10d50000.hsi2c/i2c-5/i2c-max77759tcpc/update_sdp_enum_timeout
chmod 664 /sys/devices/platform/10d50000.hsi2c/i2c-6/i2c-max77759tcpc/update_sdp_enum_timeout
chmod 664 /sys/devices/platform/10d50000.hsi2c/i2c-7/i2c-max77759tcpc/update_sdp_enum_timeout
chmod 664 /sys/devices/platform/10d50000.hsi2c/i2c-8/i2c-max77759tcpc/update_sdp_enum_timeout
chmod 664 /sys/devices/platform/10d50000.hsi2c/i2c-9/i2c-max77759tcpc/update_sdp_enum_timeout
chmod 664 /sys/devices/platform/google,pogo/move_data_to_usb