1 /* 2 * Copyright (C) 2017 The Android Open Source Project 3 * 4 * Licensed under the Apache License, Version 2.0 (the "License"); 5 * you may not use this file except in compliance with the License. 6 * You may obtain a copy of the License at 7 * 8 * http://www.apache.org/licenses/LICENSE-2.0 9 * 10 * Unless required by applicable law or agreed to in writing, software 11 * distributed under the License is distributed on an "AS IS" BASIS, 12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 13 * See the License for the specific language governing permissions and 14 * limitations under the License. 15 */ 16 17 #ifndef MTP_DESCRIPTORS_H 18 #define MTP_DESCRIPTORS_H 19 20 #include <linux/usb/ch9.h> 21 #include <linux/usb/functionfs.h> 22 #include <sys/endian.h> 23 24 namespace android { 25 26 #ifdef MTP_FUZZER 27 constexpr char FFS_MTP_EP0[] = "/data/local/tmp/usb-ffs/mtp/ep0"; 28 constexpr char FFS_MTP_EP_IN[] = "/data/local/tmp/usb-ffs/mtp/ep1"; 29 constexpr char FFS_MTP_EP_OUT[] = "/data/local/tmp/usb-ffs/mtp/ep2"; 30 constexpr char FFS_MTP_EP_INTR[] = "/data/local/tmp/usb-ffs/mtp/ep3"; 31 32 constexpr char FFS_PTP_EP0[] = "/data/local/tmp/usb-ffs/ptp/ep0"; 33 constexpr char FFS_PTP_EP_IN[] = "/data/local/tmp/usb-ffs/ptp/ep1"; 34 constexpr char FFS_PTP_EP_OUT[] = "/data/local/tmp/usb-ffs/ptp/ep2"; 35 constexpr char FFS_PTP_EP_INTR[] = "/data/local/tmp/usb-ffs/ptp/ep3"; 36 #else 37 constexpr char FFS_MTP_EP0[] = "/dev/usb-ffs/mtp/ep0"; 38 constexpr char FFS_MTP_EP_IN[] = "/dev/usb-ffs/mtp/ep1"; 39 constexpr char FFS_MTP_EP_OUT[] = "/dev/usb-ffs/mtp/ep2"; 40 constexpr char FFS_MTP_EP_INTR[] = "/dev/usb-ffs/mtp/ep3"; 41 42 constexpr char FFS_PTP_EP0[] = "/dev/usb-ffs/ptp/ep0"; 43 constexpr char FFS_PTP_EP_IN[] = "/dev/usb-ffs/ptp/ep1"; 44 constexpr char FFS_PTP_EP_OUT[] = "/dev/usb-ffs/ptp/ep2"; 45 constexpr char FFS_PTP_EP_INTR[] = "/dev/usb-ffs/ptp/ep3"; 46 #endif 47 48 constexpr int MAX_PACKET_SIZE_FS = 64; 49 constexpr int MAX_PACKET_SIZE_HS = 512; 50 constexpr int MAX_PACKET_SIZE_SS = 1024; 51 constexpr int MAX_PACKET_SIZE_EV = 28; 52 53 struct func_desc { 54 struct usb_interface_descriptor intf; 55 struct usb_endpoint_descriptor_no_audio sink; 56 struct usb_endpoint_descriptor_no_audio source; 57 struct usb_endpoint_descriptor_no_audio intr; 58 } __attribute__((packed)); 59 60 struct ss_func_desc { 61 struct usb_interface_descriptor intf; 62 struct usb_endpoint_descriptor_no_audio sink; 63 struct usb_ss_ep_comp_descriptor sink_comp; 64 struct usb_endpoint_descriptor_no_audio source; 65 struct usb_ss_ep_comp_descriptor source_comp; 66 struct usb_endpoint_descriptor_no_audio intr; 67 struct usb_ss_ep_comp_descriptor intr_comp; 68 } __attribute__((packed)); 69 70 struct desc_v1 { 71 struct usb_functionfs_descs_head_v1 { 72 __le32 magic; 73 __le32 length; 74 __le32 fs_count; 75 __le32 hs_count; 76 } __attribute__((packed)) header; 77 struct func_desc fs_descs, hs_descs; 78 } __attribute__((packed)); 79 80 struct desc_v2 { 81 struct usb_functionfs_descs_head_v2 header; 82 // The rest of the structure depends on the flags in the header. 83 __le32 fs_count; 84 __le32 hs_count; 85 __le32 ss_count; 86 __le32 os_count; 87 struct func_desc fs_descs, hs_descs; 88 struct ss_func_desc ss_descs; 89 struct usb_os_desc_header os_header; 90 struct usb_ext_compat_desc os_desc; 91 } __attribute__((packed)); 92 93 // OS descriptor contents should not be changed. See b/64790536. 94 static_assert(sizeof(struct desc_v2) == sizeof(usb_functionfs_descs_head_v2) + 95 16 + 2 * sizeof(struct func_desc) + sizeof(struct ss_func_desc) + 96 sizeof(usb_os_desc_header) + sizeof(usb_ext_compat_desc), 97 "Size of mtp descriptor is incorrect!"); 98 99 #define STR_INTERFACE "MTP" 100 struct functionfs_lang { 101 __le16 code; 102 char str1[sizeof(STR_INTERFACE)]; 103 } __attribute__((packed)); 104 105 struct functionfs_strings { 106 struct usb_functionfs_strings_head header; 107 struct functionfs_lang lang0; 108 } __attribute__((packed)); 109 110 extern const struct desc_v2 mtp_desc_v2; 111 extern const struct desc_v2 ptp_desc_v2; 112 extern const struct desc_v1 mtp_desc_v1; 113 extern const struct desc_v1 ptp_desc_v1; 114 extern const struct functionfs_strings mtp_strings; 115 116 bool writeDescriptors(int fd, bool ptp); 117 118 }; // namespace android 119 120 #endif // MTP_DESCRIPTORS_H 121