1 files changed, 282 insertions, 0 deletions
diff --git a/mtp/ffs/MtpDescriptors.cpp b/mtp/ffs/MtpDescriptors.cpp
new file mode 100644
index 000000000..54306a997
--- /dev/null
+++ b/mtp/ffs/MtpDescriptors.cpp
@@ -0,0 +1,282 @@
+/*
+ * Copyright (C) 2017 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *		http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#include <android-base/logging.h>
+#include <sys/types.h>
+#include <cutils/properties.h>
+
+#include "MtpDescriptors.h"
+#include "MtpDebug.h"
+
+const struct usb_interface_descriptor mtp_interface_desc = {
+	.bLength = USB_DT_INTERFACE_SIZE,
+	.bDescriptorType = USB_DT_INTERFACE,
+	.bInterfaceNumber = 0,
+	.bNumEndpoints = 3,
+	.bInterfaceClass = USB_CLASS_STILL_IMAGE,
+	.bInterfaceSubClass = 1,
+	.bInterfaceProtocol = 1,
+	.iInterface = 1,
+};
+
+const struct usb_interface_descriptor ptp_interface_desc = {
+	.bLength = USB_DT_INTERFACE_SIZE,
+	.bDescriptorType = USB_DT_INTERFACE,
+	.bInterfaceNumber = 0,
+	.bNumEndpoints = 3,
+	.bInterfaceClass = USB_CLASS_STILL_IMAGE,
+	.bInterfaceSubClass = 1,
+	.bInterfaceProtocol = 1,
+};
+
+const struct usb_endpoint_descriptor_no_audio fs_sink = {
+	.bLength = USB_DT_ENDPOINT_SIZE,
+	.bDescriptorType = USB_DT_ENDPOINT,
+	.bEndpointAddress = 1 | USB_DIR_IN,
+	.bmAttributes = USB_ENDPOINT_XFER_BULK,
+	.wMaxPacketSize = MAX_PACKET_SIZE_FS,
+};
+
+const struct usb_endpoint_descriptor_no_audio fs_source = {
+	.bLength = USB_DT_ENDPOINT_SIZE,
+	.bDescriptorType = USB_DT_ENDPOINT,
+	.bEndpointAddress = 2 | USB_DIR_OUT,
+	.bmAttributes = USB_ENDPOINT_XFER_BULK,
+	.wMaxPacketSize = MAX_PACKET_SIZE_FS,
+};
+
+const struct usb_endpoint_descriptor_no_audio intr = {
+	.bLength = USB_DT_ENDPOINT_SIZE,
+	.bDescriptorType = USB_DT_ENDPOINT,
+	.bEndpointAddress = 3 | USB_DIR_IN,
+	.bmAttributes = USB_ENDPOINT_XFER_INT,
+	.wMaxPacketSize = MAX_PACKET_SIZE_EV,
+	.bInterval = 6,
+};
+
+const struct usb_endpoint_descriptor_no_audio hs_sink = {
+	.bLength = USB_DT_ENDPOINT_SIZE,
+	.bDescriptorType = USB_DT_ENDPOINT,
+	.bEndpointAddress = 1 | USB_DIR_IN,
+	.bmAttributes = USB_ENDPOINT_XFER_BULK,
+	.wMaxPacketSize = MAX_PACKET_SIZE_HS,
+};
+
+const struct usb_endpoint_descriptor_no_audio hs_source = {
+	.bLength = USB_DT_ENDPOINT_SIZE,
+	.bDescriptorType = USB_DT_ENDPOINT,
+	.bEndpointAddress = 2 | USB_DIR_OUT,
+	.bmAttributes = USB_ENDPOINT_XFER_BULK,
+	.wMaxPacketSize = MAX_PACKET_SIZE_HS,
+};
+
+const struct usb_endpoint_descriptor_no_audio ss_sink = {
+	.bLength = USB_DT_ENDPOINT_SIZE,
+	.bDescriptorType = USB_DT_ENDPOINT,
+	.bEndpointAddress = 1 | USB_DIR_IN,
+	.bmAttributes = USB_ENDPOINT_XFER_BULK,
+	.wMaxPacketSize = MAX_PACKET_SIZE_SS,
+};
+
+const struct usb_endpoint_descriptor_no_audio ss_source = {
+	.bLength = USB_DT_ENDPOINT_SIZE,
+	.bDescriptorType = USB_DT_ENDPOINT,
+	.bEndpointAddress = 2 | USB_DIR_OUT,
+	.bmAttributes = USB_ENDPOINT_XFER_BULK,
+	.wMaxPacketSize = MAX_PACKET_SIZE_SS,
+};
+
+const struct usb_ss_ep_comp_descriptor ss_sink_comp = {
+	.bLength = sizeof(ss_sink_comp),
+	.bDescriptorType = USB_DT_SS_ENDPOINT_COMP,
+	.bMaxBurst = 6,
+};
+
+const struct usb_ss_ep_comp_descriptor ss_source_comp = {
+	.bLength = sizeof(ss_source_comp),
+	.bDescriptorType = USB_DT_SS_ENDPOINT_COMP,
+	.bMaxBurst = 6,
+};
+
+const struct usb_ss_ep_comp_descriptor ss_intr_comp = {
+	.bLength = sizeof(ss_intr_comp),
+	.bDescriptorType = USB_DT_SS_ENDPOINT_COMP,
+};
+
+const struct func_desc mtp_fs_descriptors = {
+	.intf = mtp_interface_desc,
+	.sink = fs_sink,
+	.source = fs_source,
+	.intr = intr,
+};
+
+const struct func_desc mtp_hs_descriptors = {
+	.intf = mtp_interface_desc,
+	.sink = hs_sink,
+	.source = hs_source,
+	.intr = intr,
+};
+
+const struct ss_func_desc mtp_ss_descriptors = {
+	.intf = mtp_interface_desc,
+	.sink = ss_sink,
+	.sink_comp = ss_sink_comp,
+	.source = ss_source,
+	.source_comp = ss_source_comp,
+	.intr = intr,
+	.intr_comp = ss_intr_comp,
+};
+
+const struct func_desc ptp_fs_descriptors = {
+	.intf = ptp_interface_desc,
+	.sink = fs_sink,
+	.source = fs_source,
+	.intr = intr,
+};
+
+const struct func_desc ptp_hs_descriptors = {
+	.intf = ptp_interface_desc,
+	.sink = hs_sink,
+	.source = hs_source,
+	.intr = intr,
+};
+
+const struct ss_func_desc ptp_ss_descriptors = {
+	.intf = ptp_interface_desc,
+	.sink = ss_sink,
+	.sink_comp = ss_sink_comp,
+	.source = ss_source,
+	.source_comp = ss_source_comp,
+	.intr = intr,
+	.intr_comp = ss_intr_comp,
+};
+
+const struct functionfs_strings mtp_strings = {
+	.header = {
+		.magic = htole32(FUNCTIONFS_STRINGS_MAGIC),
+		.length = htole32(sizeof(mtp_strings)),
+		.str_count = htole32(1),
+		.lang_count = htole32(1),
+	},
+	.lang0 = {
+		.code = htole16(0x0409),
+		.str1 = STR_INTERFACE,
+	},
+};
+
+const struct usb_os_desc_header mtp_os_desc_header = {
+	.interface = htole32(1),
+	.dwLength = htole32(sizeof(usb_os_desc_header) + sizeof(usb_ext_compat_desc)),
+	.bcdVersion = htole16(1),
+	.wIndex = htole16(4),
+	.bCount = htole16(1),
+	.Reserved = htole16(0),
+};
+
+const struct usb_ext_compat_desc mtp_os_desc_compat = {
+	.bFirstInterfaceNumber = 0,
+	.Reserved1 = htole32(1),
+	.CompatibleID = { 'M', 'T', 'P' },
+	.SubCompatibleID = {0},
+	.Reserved2 = {0},
+};
+
+const struct usb_ext_compat_desc ptp_os_desc_compat = {
+	.bFirstInterfaceNumber = 0,
+	.Reserved1 = htole32(1),
+	.CompatibleID = { 'P', 'T', 'P' },
+	.SubCompatibleID = {0},
+	.Reserved2 = {0},
+};
+
+const struct desc_v2 mtp_desc_v2 = {
+	.header = {
+		.magic = htole32(FUNCTIONFS_DESCRIPTORS_MAGIC_V2),
+		.length = htole32(sizeof(struct desc_v2)),
+		.flags = FUNCTIONFS_HAS_FS_DESC | FUNCTIONFS_HAS_HS_DESC |
+				 FUNCTIONFS_HAS_SS_DESC | FUNCTIONFS_HAS_MS_OS_DESC,
+	},
+	.fs_count = 4,
+	.hs_count = 4,
+	.ss_count = 7,
+	.os_count = 1,
+	.fs_descs = mtp_fs_descriptors,
+	.hs_descs = mtp_hs_descriptors,
+	.ss_descs = mtp_ss_descriptors,
+	.os_header = mtp_os_desc_header,
+	.os_desc = mtp_os_desc_compat,
+};
+
+const struct desc_v2 ptp_desc_v2 = {
+	.header = {
+		.magic = htole32(FUNCTIONFS_DESCRIPTORS_MAGIC_V2),
+		.length = htole32(sizeof(struct desc_v2)),
+		.flags = FUNCTIONFS_HAS_FS_DESC | FUNCTIONFS_HAS_HS_DESC |
+				 FUNCTIONFS_HAS_SS_DESC | FUNCTIONFS_HAS_MS_OS_DESC,
+	},
+	.fs_count = 4,
+	.hs_count = 4,
+	.ss_count = 7,
+	.os_count = 1,
+	.fs_descs = ptp_fs_descriptors,
+	.hs_descs = ptp_hs_descriptors,
+	.ss_descs = ptp_ss_descriptors,
+	.os_header = mtp_os_desc_header,
+	.os_desc = ptp_os_desc_compat,
+};
+
+const struct desc_v1 mtp_desc_v1 = {
+	.header = {
+		.magic = htole32(FUNCTIONFS_DESCRIPTORS_MAGIC),
+		.length = htole32(sizeof(struct desc_v1)),
+		.fs_count = 4,
+		.hs_count = 4,
+	},
+	.fs_descs = mtp_fs_descriptors,
+	.hs_descs = mtp_hs_descriptors,
+};
+
+const struct desc_v1 ptp_desc_v1 = {
+	.header = {
+		.magic = htole32(FUNCTIONFS_DESCRIPTORS_MAGIC),
+		.length = htole32(sizeof(struct desc_v1)),
+		.fs_count = 4,
+		.hs_count = 4,
+	},
+	.fs_descs = ptp_fs_descriptors,
+	.hs_descs = ptp_hs_descriptors,
+};
+
+bool writeDescriptors(int fd, bool ptp) {
+	ssize_t ret = TEMP_FAILURE_RETRY(write(fd,
+				&(ptp ? ptp_desc_v2 : mtp_desc_v2), sizeof(desc_v2)));
+	if (ret < 0) {
+		MTPE("Switching to V1 descriptor format\n");
+		ret = TEMP_FAILURE_RETRY(write(fd,
+					&(ptp ? ptp_desc_v1 : mtp_desc_v1), sizeof(desc_v1)));
+		if (ret < 0) {
+			MTPE("Writing descriptors failed\n");
+			return false;
+		}
+	}
+	ret = TEMP_FAILURE_RETRY(write(fd, &mtp_strings, sizeof(mtp_strings)));
+	if (ret < 0) {
+		MTPE("Writing strings failed\n");
+		return false;
+	}
+	property_set("sys.usb.ffs.mtp.ready", "1");
+	return true;
+}