| Jerry Zhang | 69b7450 | 2017-10-02 16:26:37 -0700 | [diff] [blame] | 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 | constexpr int MAX_PACKET_SIZE_FS = 64; |
| 27 | constexpr int MAX_PACKET_SIZE_HS = 512; |
| 28 | constexpr int MAX_PACKET_SIZE_SS = 1024; |
| 29 | constexpr int MAX_PACKET_SIZE_EV = 28; |
| 30 | |
| 31 | struct func_desc { |
| 32 | struct usb_interface_descriptor intf; |
| 33 | struct usb_endpoint_descriptor_no_audio sink; |
| 34 | struct usb_endpoint_descriptor_no_audio source; |
| 35 | struct usb_endpoint_descriptor_no_audio intr; |
| 36 | } __attribute__((packed)); |
| 37 | |
| 38 | struct ss_func_desc { |
| 39 | struct usb_interface_descriptor intf; |
| 40 | struct usb_endpoint_descriptor_no_audio sink; |
| 41 | struct usb_ss_ep_comp_descriptor sink_comp; |
| 42 | struct usb_endpoint_descriptor_no_audio source; |
| 43 | struct usb_ss_ep_comp_descriptor source_comp; |
| 44 | struct usb_endpoint_descriptor_no_audio intr; |
| 45 | struct usb_ss_ep_comp_descriptor intr_comp; |
| 46 | } __attribute__((packed)); |
| 47 | |
| 48 | struct desc_v1 { |
| 49 | struct usb_functionfs_descs_head_v1 { |
| 50 | __le32 magic; |
| 51 | __le32 length; |
| 52 | __le32 fs_count; |
| 53 | __le32 hs_count; |
| 54 | } __attribute__((packed)) header; |
| 55 | struct func_desc fs_descs, hs_descs; |
| 56 | } __attribute__((packed)); |
| 57 | |
| 58 | struct desc_v2 { |
| 59 | struct usb_functionfs_descs_head_v2 header; |
| 60 | // The rest of the structure depends on the flags in the header. |
| 61 | __le32 fs_count; |
| 62 | __le32 hs_count; |
| 63 | __le32 ss_count; |
| 64 | __le32 os_count; |
| 65 | struct func_desc fs_descs, hs_descs; |
| 66 | struct ss_func_desc ss_descs; |
| 67 | struct usb_os_desc_header os_header; |
| 68 | struct usb_ext_compat_desc os_desc; |
| 69 | } __attribute__((packed)); |
| 70 | |
| 71 | // OS descriptor contents should not be changed. See b/64790536. |
| 72 | static_assert(sizeof(struct desc_v2) == sizeof(usb_functionfs_descs_head_v2) + |
| 73 | 16 + 2 * sizeof(struct func_desc) + sizeof(struct ss_func_desc) + |
| 74 | sizeof(usb_os_desc_header) + sizeof(usb_ext_compat_desc), |
| 75 | "Size of mtp descriptor is incorrect!"); |
| 76 | |
| 77 | #define STR_INTERFACE "MTP" |
| 78 | struct functionfs_lang { |
| 79 | __le16 code; |
| 80 | char str1[sizeof(STR_INTERFACE)]; |
| 81 | } __attribute__((packed)); |
| 82 | |
| 83 | struct functionfs_strings { |
| 84 | struct usb_functionfs_strings_head header; |
| 85 | struct functionfs_lang lang0; |
| 86 | } __attribute__((packed)); |
| 87 | |
| 88 | extern const struct desc_v2 mtp_desc_v2; |
| 89 | extern const struct desc_v2 ptp_desc_v2; |
| 90 | extern const struct desc_v1 mtp_desc_v1; |
| 91 | extern const struct desc_v1 ptp_desc_v1; |
| 92 | extern const struct functionfs_strings mtp_strings; |
| 93 | |
| 94 | }; // namespace android |
| 95 | |
| 96 | #endif // MTP_DESCRIPTORS_H |