fastbootd: usb: fallback to v1 descriptors (8b3311d7) · Commits · e / os / android_system_core

fastboot/device/usb_client.cpp

+27 −2

Original line number	Diff line number	Diff line
		@@ -53,6 +53,16 @@ struct SsFuncDesc {
		struct usb_ss_ep_comp_descriptor sink_comp;
		} __attribute__((packed));

		struct DescV1 {
		struct usb_functionfs_descs_head_v1 {
		__le32 magic;
		__le32 length;
		__le32 fs_count;
		__le32 hs_count;
		} __attribute__((packed)) header;
		struct FuncDesc fs_descs, hs_descs;
		} __attribute__((packed));

		struct DescV2 {
		struct usb_functionfs_descs_head_v2 header;
		// The rest of the structure depends on the flags in the header.
		@@ -169,6 +179,17 @@ static const struct {
		},
		};

		static struct DescV1 v1_descriptor = {
		.header = {
		.magic = htole32(FUNCTIONFS_DESCRIPTORS_MAGIC),
		.length = htole32(sizeof(v1_descriptor)),
		.fs_count = 3,
		.hs_count = 3,
		},
		.fs_descs = fs_descriptors,
		.hs_descs = hs_descriptors,
		};

		static struct DescV2 v2_descriptor = {
		.header =
		{
		@@ -204,10 +225,14 @@ static bool InitFunctionFs(usb_handle* h) {
		}

		auto ret = write(h->control.get(), &v2_descriptor, sizeof(v2_descriptor));
		if (ret < 0) {
		// fallback to v1 descriptor
		ret = write(h->control.get(), &v1_descriptor, sizeof(v1_descriptor));
		if (ret < 0) {
		PLOG(ERROR) << "cannot write descriptors " << kUsbFfsFastbootEp0;
		goto err;
		}
		}

		ret = write(h->control.get(), &strings, sizeof(strings));
		if (ret < 0) {