The storage_common.c source file from v2.6.36 Linux kernel. commit d26a6aa08b9f12b44fb1ee65625e7480d3d5bb81 Author: Michal Nazarewicz <m.nazarewicz@samsung.com> Date: Mon Nov 9 14:15:23 2009 +0100 USB: g_mass_storage: code cleaned up and comments updated Signed-off-by: Lukasz Majewski <l.majewski@samsung.com> Signed-off-by: Andrzej Pietrasiewicz <andrzej.p@samsung.com> Signed-off-by: Kyungmin Park <kyungmin.park@samsung.com> CC: Marek Vasut <marek.vasut@gmail.com>master
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/*
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* storage_common.c -- Common definitions for mass storage functionality |
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* |
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* Copyright (C) 2003-2008 Alan Stern |
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* Copyeight (C) 2009 Samsung Electronics |
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* Author: Michal Nazarewicz (m.nazarewicz@samsung.com) |
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* |
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* Ported to u-boot: |
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* Andrzej Pietrasiewicz <andrzej.p@samsung.com> |
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* |
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* Code refactoring & cleanup: |
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* Łukasz Majewski <l.majewski@samsung.com> |
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* |
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* This program is free software; you can redistribute it and/or modify |
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* it under the terms of the GNU General Public License as published by |
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* the Free Software Foundation; either version 2 of the License, or |
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* (at your option) any later version. |
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* |
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* This program is distributed in the hope that it will be useful, |
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* but WITHOUT ANY WARRANTY; without even the implied warranty of |
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
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* GNU General Public License for more details. |
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* |
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* You should have received a copy of the GNU General Public License |
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* along with this program; if not, write to the Free Software |
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* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA |
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*/ |
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/*
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* This file requires the following identifiers used in USB strings to |
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* be defined (each of type pointer to char): |
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* - fsg_string_manufacturer -- name of the manufacturer |
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* - fsg_string_product -- name of the product |
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* - fsg_string_serial -- product's serial |
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* - fsg_string_config -- name of the configuration |
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* - fsg_string_interface -- name of the interface |
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* The first four are only needed when FSG_DESCRIPTORS_DEVICE_STRINGS |
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* macro is defined prior to including this file. |
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*/ |
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/*
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* When FSG_NO_INTR_EP is defined fsg_fs_intr_in_desc and |
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* fsg_hs_intr_in_desc objects as well as |
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* FSG_FS_FUNCTION_PRE_EP_ENTRIES and FSG_HS_FUNCTION_PRE_EP_ENTRIES |
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* macros are not defined. |
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* |
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* When FSG_NO_DEVICE_STRINGS is defined FSG_STRING_MANUFACTURER, |
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* FSG_STRING_PRODUCT, FSG_STRING_SERIAL and FSG_STRING_CONFIG are not |
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* defined (as well as corresponding entries in string tables are |
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* missing) and FSG_STRING_INTERFACE has value of zero. |
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* |
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* When FSG_NO_OTG is defined fsg_otg_desc won't be defined. |
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*/ |
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/*
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* When FSG_BUFFHD_STATIC_BUFFER is defined when this file is included |
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* the fsg_buffhd structure's buf field will be an array of FSG_BUFLEN |
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* characters rather then a pointer to void. |
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*/ |
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/* #include <asm/unaligned.h> */ |
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/*
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* Thanks to NetChip Technologies for donating this product ID. |
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* |
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* DO NOT REUSE THESE IDs with any other driver!! Ever!! |
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* Instead: allocate your own, using normal USB-IF procedures. |
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*/ |
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#define FSG_VENDOR_ID 0x0525 /* NetChip */ |
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#define FSG_PRODUCT_ID 0xa4a5 /* Linux-USB File-backed Storage Gadget */ |
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/*-------------------------------------------------------------------------*/ |
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#ifndef DEBUG |
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#undef VERBOSE_DEBUG |
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#undef DUMP_MSGS |
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#endif /* !DEBUG */ |
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#ifdef VERBOSE_DEBUG |
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#define VLDBG LDBG |
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#else |
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#define VLDBG(lun, fmt, args...) do { } while (0) |
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#endif /* VERBOSE_DEBUG */ |
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/*
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#define LDBG(lun, fmt, args...) dev_dbg (&(lun)->dev, fmt, ## args) |
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#define LERROR(lun, fmt, args...) dev_err (&(lun)->dev, fmt, ## args) |
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#define LWARN(lun, fmt, args...) dev_warn(&(lun)->dev, fmt, ## args) |
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#define LINFO(lun, fmt, args...) dev_info(&(lun)->dev, fmt, ## args) |
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*/ |
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#define LDBG(lun, fmt, args...) do { } while (0) |
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#define LERROR(lun, fmt, args...) do { } while (0) |
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#define LWARN(lun, fmt, args...) do { } while (0) |
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#define LINFO(lun, fmt, args...) do { } while (0) |
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/*
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* Keep those macros in sync with those in |
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* include/linux/usb/composite.h or else GCC will complain. If they |
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* are identical (the same names of arguments, white spaces in the |
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* same places) GCC will allow redefinition otherwise (even if some |
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* white space is removed or added) warning will be issued. |
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* |
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* Those macros are needed here because File Storage Gadget does not |
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* include the composite.h header. For composite gadgets those macros |
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* are redundant since composite.h is included any way. |
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* |
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* One could check whether those macros are already defined (which |
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* would indicate composite.h had been included) or not (which would |
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* indicate we were in FSG) but this is not done because a warning is |
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* desired if definitions here differ from the ones in composite.h. |
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* |
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* We want the definitions to match and be the same in File Storage |
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* Gadget as well as Mass Storage Function (and so composite gadgets |
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* using MSF). If someone changes them in composite.h it will produce |
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* a warning in this file when building MSF. |
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*/ |
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#define DBG(d, fmt, args...) debug(fmt , ## args) |
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#define VDBG(d, fmt, args...) debug(fmt , ## args) |
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/* #define ERROR(d, fmt, args...) printf(fmt , ## args) */ |
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/* #define WARNING(d, fmt, args...) printf(fmt , ## args) */ |
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/* #define INFO(d, fmt, args...) printf(fmt , ## args) */ |
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/* #define DBG(d, fmt, args...) do { } while (0) */ |
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/* #define VDBG(d, fmt, args...) do { } while (0) */ |
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#define ERROR(d, fmt, args...) do { } while (0) |
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#define WARNING(d, fmt, args...) do { } while (0) |
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#define INFO(d, fmt, args...) do { } while (0) |
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#ifdef DUMP_MSGS |
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/* dump_msg(fsg, const char * label, const u8 * buf, unsigned length); */ |
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# define dump_msg(fsg, label, buf, length) do { \ |
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if (length < 512) { \
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DBG(fsg, "%s, length %u:\n", label, length); \
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print_hex_dump(KERN_DEBUG, "", DUMP_PREFIX_OFFSET, \
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16, 1, buf, length, 0); \
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} \
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} while (0) |
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# define dump_cdb(fsg) do { } while (0) |
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#else |
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# define dump_msg(fsg, /* const char * */ label, \ |
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/* const u8 * */ buf, /* unsigned */ length) do { } while (0) |
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# ifdef VERBOSE_DEBUG |
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# define dump_cdb(fsg) \ |
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print_hex_dump(KERN_DEBUG, "SCSI CDB: ", DUMP_PREFIX_NONE, \
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16, 1, (fsg)->cmnd, (fsg)->cmnd_size, 0) \
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# else |
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# define dump_cdb(fsg) do { } while (0) |
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# endif /* VERBOSE_DEBUG */ |
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#endif /* DUMP_MSGS */ |
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/*-------------------------------------------------------------------------*/ |
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/* SCSI device types */ |
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#define TYPE_DISK 0x00 |
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#define TYPE_CDROM 0x05 |
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/* USB protocol value = the transport method */ |
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#define USB_PR_CBI 0x00 /* Control/Bulk/Interrupt */ |
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#define USB_PR_CB 0x01 /* Control/Bulk w/o interrupt */ |
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#define USB_PR_BULK 0x50 /* Bulk-only */ |
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/* USB subclass value = the protocol encapsulation */ |
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#define USB_SC_RBC 0x01 /* Reduced Block Commands (flash) */ |
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#define USB_SC_8020 0x02 /* SFF-8020i, MMC-2, ATAPI (CD-ROM) */ |
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#define USB_SC_QIC 0x03 /* QIC-157 (tape) */ |
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#define USB_SC_UFI 0x04 /* UFI (floppy) */ |
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#define USB_SC_8070 0x05 /* SFF-8070i (removable) */ |
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#define USB_SC_SCSI 0x06 /* Transparent SCSI */ |
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/* Bulk-only data structures */ |
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/* Command Block Wrapper */ |
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struct fsg_bulk_cb_wrap { |
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__le32 Signature; /* Contains 'USBC' */ |
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u32 Tag; /* Unique per command id */ |
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__le32 DataTransferLength; /* Size of the data */ |
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u8 Flags; /* Direction in bit 7 */ |
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u8 Lun; /* LUN (normally 0) */ |
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u8 Length; /* Of the CDB, <= MAX_COMMAND_SIZE */ |
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u8 CDB[16]; /* Command Data Block */ |
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}; |
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#define USB_BULK_CB_WRAP_LEN 31 |
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#define USB_BULK_CB_SIG 0x43425355 /* Spells out USBC */ |
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#define USB_BULK_IN_FLAG 0x80 |
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/* Command Status Wrapper */ |
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struct bulk_cs_wrap { |
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__le32 Signature; /* Should = 'USBS' */ |
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u32 Tag; /* Same as original command */ |
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__le32 Residue; /* Amount not transferred */ |
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u8 Status; /* See below */ |
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}; |
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#define USB_BULK_CS_WRAP_LEN 13 |
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#define USB_BULK_CS_SIG 0x53425355 /* Spells out 'USBS' */ |
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#define USB_STATUS_PASS 0 |
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#define USB_STATUS_FAIL 1 |
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#define USB_STATUS_PHASE_ERROR 2 |
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/* Bulk-only class specific requests */ |
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#define USB_BULK_RESET_REQUEST 0xff |
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#define USB_BULK_GET_MAX_LUN_REQUEST 0xfe |
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/* CBI Interrupt data structure */ |
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struct interrupt_data { |
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u8 bType; |
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u8 bValue; |
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}; |
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#define CBI_INTERRUPT_DATA_LEN 2 |
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/* CBI Accept Device-Specific Command request */ |
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#define USB_CBI_ADSC_REQUEST 0x00 |
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/* Length of a SCSI Command Data Block */ |
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#define MAX_COMMAND_SIZE 16 |
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/* SCSI commands that we recognize */ |
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#define SC_FORMAT_UNIT 0x04 |
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#define SC_INQUIRY 0x12 |
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#define SC_MODE_SELECT_6 0x15 |
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#define SC_MODE_SELECT_10 0x55 |
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#define SC_MODE_SENSE_6 0x1a |
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#define SC_MODE_SENSE_10 0x5a |
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#define SC_PREVENT_ALLOW_MEDIUM_REMOVAL 0x1e |
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#define SC_READ_6 0x08 |
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#define SC_READ_10 0x28 |
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#define SC_READ_12 0xa8 |
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#define SC_READ_CAPACITY 0x25 |
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#define SC_READ_FORMAT_CAPACITIES 0x23 |
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#define SC_READ_HEADER 0x44 |
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#define SC_READ_TOC 0x43 |
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#define SC_RELEASE 0x17 |
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#define SC_REQUEST_SENSE 0x03 |
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#define SC_RESERVE 0x16 |
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#define SC_SEND_DIAGNOSTIC 0x1d |
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#define SC_START_STOP_UNIT 0x1b |
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#define SC_SYNCHRONIZE_CACHE 0x35 |
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#define SC_TEST_UNIT_READY 0x00 |
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#define SC_VERIFY 0x2f |
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#define SC_WRITE_6 0x0a |
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#define SC_WRITE_10 0x2a |
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#define SC_WRITE_12 0xaa |
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/* SCSI Sense Key/Additional Sense Code/ASC Qualifier values */ |
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#define SS_NO_SENSE 0 |
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#define SS_COMMUNICATION_FAILURE 0x040800 |
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#define SS_INVALID_COMMAND 0x052000 |
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#define SS_INVALID_FIELD_IN_CDB 0x052400 |
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#define SS_LOGICAL_BLOCK_ADDRESS_OUT_OF_RANGE 0x052100 |
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#define SS_LOGICAL_UNIT_NOT_SUPPORTED 0x052500 |
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#define SS_MEDIUM_NOT_PRESENT 0x023a00 |
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#define SS_MEDIUM_REMOVAL_PREVENTED 0x055302 |
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#define SS_NOT_READY_TO_READY_TRANSITION 0x062800 |
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#define SS_RESET_OCCURRED 0x062900 |
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#define SS_SAVING_PARAMETERS_NOT_SUPPORTED 0x053900 |
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#define SS_UNRECOVERED_READ_ERROR 0x031100 |
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#define SS_WRITE_ERROR 0x030c02 |
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#define SS_WRITE_PROTECTED 0x072700 |
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#define SK(x) ((u8) ((x) >> 16)) /* Sense Key byte, etc. */ |
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#define ASC(x) ((u8) ((x) >> 8)) |
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#define ASCQ(x) ((u8) (x)) |
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struct device_attribute { int i; }; |
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struct rw_semaphore { int i; }; |
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#define down_write(...) do { } while (0) |
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#define up_write(...) do { } while (0) |
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#define down_read(...) do { } while (0) |
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#define up_read(...) do { } while (0) |
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#define ETOOSMALL 525 |
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#include <usb_mass_storage.h> |
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extern struct ums_board_info *ums_info; |
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/*-------------------------------------------------------------------------*/ |
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struct fsg_lun { |
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loff_t file_length; |
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loff_t num_sectors; |
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unsigned int initially_ro:1; |
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unsigned int ro:1; |
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unsigned int removable:1; |
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unsigned int cdrom:1; |
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unsigned int prevent_medium_removal:1; |
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unsigned int registered:1; |
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unsigned int info_valid:1; |
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unsigned int nofua:1; |
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u32 sense_data; |
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u32 sense_data_info; |
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u32 unit_attention_data; |
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struct device dev; |
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}; |
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#define fsg_lun_is_open(curlun) ((curlun)->filp != NULL) |
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#if 0 |
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static struct fsg_lun *fsg_lun_from_dev(struct device *dev) |
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{ |
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return container_of(dev, struct fsg_lun, dev); |
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} |
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#endif |
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/* Big enough to hold our biggest descriptor */ |
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#define EP0_BUFSIZE 256 |
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#define DELAYED_STATUS (EP0_BUFSIZE + 999) /* An impossibly large value */ |
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/* Number of buffers we will use. 2 is enough for double-buffering */ |
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#define FSG_NUM_BUFFERS 2 |
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/* Default size of buffer length. */ |
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#define FSG_BUFLEN ((u32)16384) |
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/* Maximal number of LUNs supported in mass storage function */ |
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#define FSG_MAX_LUNS 8 |
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enum fsg_buffer_state { |
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BUF_STATE_EMPTY = 0, |
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BUF_STATE_FULL, |
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BUF_STATE_BUSY |
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}; |
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struct fsg_buffhd { |
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#ifdef FSG_BUFFHD_STATIC_BUFFER |
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char buf[FSG_BUFLEN]; |
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#else |
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void *buf; |
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#endif |
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enum fsg_buffer_state state; |
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struct fsg_buffhd *next; |
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/*
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* The NetChip 2280 is faster, and handles some protocol faults |
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* better, if we don't submit any short bulk-out read requests. |
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* So we will record the intended request length here. |
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*/ |
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unsigned int bulk_out_intended_length; |
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struct usb_request *inreq; |
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int inreq_busy; |
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struct usb_request *outreq; |
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int outreq_busy; |
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}; |
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enum fsg_state { |
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/* This one isn't used anywhere */ |
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FSG_STATE_COMMAND_PHASE = -10, |
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FSG_STATE_DATA_PHASE, |
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FSG_STATE_STATUS_PHASE, |
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FSG_STATE_IDLE = 0, |
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FSG_STATE_ABORT_BULK_OUT, |
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FSG_STATE_RESET, |
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FSG_STATE_INTERFACE_CHANGE, |
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FSG_STATE_CONFIG_CHANGE, |
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FSG_STATE_DISCONNECT, |
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FSG_STATE_EXIT, |
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FSG_STATE_TERMINATED |
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}; |
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enum data_direction { |
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DATA_DIR_UNKNOWN = 0, |
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DATA_DIR_FROM_HOST, |
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DATA_DIR_TO_HOST, |
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DATA_DIR_NONE |
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}; |
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/*-------------------------------------------------------------------------*/ |
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static inline u32 get_unaligned_be24(u8 *buf) |
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{ |
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return 0xffffff & (u32) get_unaligned_be32(buf - 1); |
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} |
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/*-------------------------------------------------------------------------*/ |
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enum { |
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#ifndef FSG_NO_DEVICE_STRINGS |
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FSG_STRING_MANUFACTURER = 1, |
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FSG_STRING_PRODUCT, |
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FSG_STRING_SERIAL, |
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FSG_STRING_CONFIG, |
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#endif |
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FSG_STRING_INTERFACE |
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}; |
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#ifndef FSG_NO_OTG |
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static struct usb_otg_descriptor |
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fsg_otg_desc = { |
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.bLength = sizeof fsg_otg_desc, |
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.bDescriptorType = USB_DT_OTG, |
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.bmAttributes = USB_OTG_SRP, |
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}; |
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#endif |
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/* There is only one interface. */ |
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static struct usb_interface_descriptor |
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fsg_intf_desc = { |
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.bLength = sizeof fsg_intf_desc, |
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.bDescriptorType = USB_DT_INTERFACE, |
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.bNumEndpoints = 2, /* Adjusted during fsg_bind() */ |
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.bInterfaceClass = USB_CLASS_MASS_STORAGE, |
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.bInterfaceSubClass = USB_SC_SCSI, /* Adjusted during fsg_bind() */ |
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.bInterfaceProtocol = USB_PR_BULK, /* Adjusted during fsg_bind() */ |
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.iInterface = FSG_STRING_INTERFACE, |
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}; |
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/*
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* Three full-speed endpoint descriptors: bulk-in, bulk-out, and |
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* interrupt-in. |
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*/ |
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static struct usb_endpoint_descriptor |
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fsg_fs_bulk_in_desc = { |
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.bLength = USB_DT_ENDPOINT_SIZE, |
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.bDescriptorType = USB_DT_ENDPOINT, |
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.bEndpointAddress = USB_DIR_IN, |
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.bmAttributes = USB_ENDPOINT_XFER_BULK, |
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/* wMaxPacketSize set by autoconfiguration */ |
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}; |
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static struct usb_endpoint_descriptor |
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fsg_fs_bulk_out_desc = { |
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.bLength = USB_DT_ENDPOINT_SIZE, |
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.bDescriptorType = USB_DT_ENDPOINT, |
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.bEndpointAddress = USB_DIR_OUT, |
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.bmAttributes = USB_ENDPOINT_XFER_BULK, |
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/* wMaxPacketSize set by autoconfiguration */ |
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}; |
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#ifndef FSG_NO_INTR_EP |
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static struct usb_endpoint_descriptor |
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fsg_fs_intr_in_desc = { |
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.bLength = USB_DT_ENDPOINT_SIZE, |
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.bDescriptorType = USB_DT_ENDPOINT, |
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.bEndpointAddress = USB_DIR_IN, |
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.bmAttributes = USB_ENDPOINT_XFER_INT, |
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.wMaxPacketSize = cpu_to_le16(2), |
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.bInterval = 32, /* frames -> 32 ms */ |
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}; |
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#ifndef FSG_NO_OTG |
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# define FSG_FS_FUNCTION_PRE_EP_ENTRIES 2 |
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#else |
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# define FSG_FS_FUNCTION_PRE_EP_ENTRIES 1 |
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#endif |
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#endif |
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static struct usb_descriptor_header *fsg_fs_function[] = { |
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#ifndef FSG_NO_OTG |
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(struct usb_descriptor_header *) &fsg_otg_desc, |
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#endif |
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(struct usb_descriptor_header *) &fsg_intf_desc, |
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(struct usb_descriptor_header *) &fsg_fs_bulk_in_desc, |
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(struct usb_descriptor_header *) &fsg_fs_bulk_out_desc, |
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#ifndef FSG_NO_INTR_EP |
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(struct usb_descriptor_header *) &fsg_fs_intr_in_desc, |
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#endif |
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NULL, |
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}; |
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/*
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* USB 2.0 devices need to expose both high speed and full speed |
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* descriptors, unless they only run at full speed. |
||||
* |
||||
* That means alternate endpoint descriptors (bigger packets) |
||||
* and a "device qualifier" ... plus more construction options |
||||
* for the configuration descriptor. |
||||
*/ |
||||
static struct usb_endpoint_descriptor |
||||
fsg_hs_bulk_in_desc = { |
||||
.bLength = USB_DT_ENDPOINT_SIZE, |
||||
.bDescriptorType = USB_DT_ENDPOINT, |
||||
|
||||
/* bEndpointAddress copied from fs_bulk_in_desc during fsg_bind() */ |
||||
.bmAttributes = USB_ENDPOINT_XFER_BULK, |
||||
.wMaxPacketSize = cpu_to_le16(512), |
||||
}; |
||||
|
||||
static struct usb_endpoint_descriptor |
||||
fsg_hs_bulk_out_desc = { |
||||
.bLength = USB_DT_ENDPOINT_SIZE, |
||||
.bDescriptorType = USB_DT_ENDPOINT, |
||||
|
||||
/* bEndpointAddress copied from fs_bulk_out_desc during fsg_bind() */ |
||||
.bmAttributes = USB_ENDPOINT_XFER_BULK, |
||||
.wMaxPacketSize = cpu_to_le16(512), |
||||
.bInterval = 1, /* NAK every 1 uframe */ |
||||
}; |
||||
|
||||
#ifndef FSG_NO_INTR_EP |
||||
|
||||
static struct usb_endpoint_descriptor |
||||
fsg_hs_intr_in_desc = { |
||||
.bLength = USB_DT_ENDPOINT_SIZE, |
||||
.bDescriptorType = USB_DT_ENDPOINT, |
||||
|
||||
/* bEndpointAddress copied from fs_intr_in_desc during fsg_bind() */ |
||||
.bmAttributes = USB_ENDPOINT_XFER_INT, |
||||
.wMaxPacketSize = cpu_to_le16(2), |
||||
.bInterval = 9, /* 2**(9-1) = 256 uframes -> 32 ms */ |
||||
}; |
||||
|
||||
#ifndef FSG_NO_OTG |
||||
# define FSG_HS_FUNCTION_PRE_EP_ENTRIES 2 |
||||
#else |
||||
# define FSG_HS_FUNCTION_PRE_EP_ENTRIES 1 |
||||
#endif |
||||
|
||||
#endif |
||||
|
||||
static struct usb_descriptor_header *fsg_hs_function[] = { |
||||
#ifndef FSG_NO_OTG |
||||
(struct usb_descriptor_header *) &fsg_otg_desc, |
||||
#endif |
||||
(struct usb_descriptor_header *) &fsg_intf_desc, |
||||
(struct usb_descriptor_header *) &fsg_hs_bulk_in_desc, |
||||
(struct usb_descriptor_header *) &fsg_hs_bulk_out_desc, |
||||
#ifndef FSG_NO_INTR_EP |
||||
(struct usb_descriptor_header *) &fsg_hs_intr_in_desc, |
||||
#endif |
||||
NULL, |
||||
}; |
||||
|
||||
/* Maxpacket and other transfer characteristics vary by speed. */ |
||||
static struct usb_endpoint_descriptor * |
||||
fsg_ep_desc(struct usb_gadget *g, struct usb_endpoint_descriptor *fs, |
||||
struct usb_endpoint_descriptor *hs) |
||||
{ |
||||
if (gadget_is_dualspeed(g) && g->speed == USB_SPEED_HIGH) |
||||
return hs; |
||||
return fs; |
||||
} |
||||
|
||||
/* Static strings, in UTF-8 (for simplicity we use only ASCII characters) */ |
||||
static struct usb_string fsg_strings[] = { |
||||
#ifndef FSG_NO_DEVICE_STRINGS |
||||
{FSG_STRING_MANUFACTURER, fsg_string_manufacturer}, |
||||
{FSG_STRING_PRODUCT, fsg_string_product}, |
||||
{FSG_STRING_SERIAL, fsg_string_serial}, |
||||
{FSG_STRING_CONFIG, fsg_string_config}, |
||||
#endif |
||||
{FSG_STRING_INTERFACE, fsg_string_interface}, |
||||
{} |
||||
}; |
||||
|
||||
static struct usb_gadget_strings fsg_stringtab = { |
||||
.language = 0x0409, /* en-us */ |
||||
.strings = fsg_strings, |
||||
}; |
||||
|
||||
/*-------------------------------------------------------------------------*/ |
||||
|
||||
/*
|
||||
* If the next two routines are called while the gadget is registered, |
||||
* the caller must own fsg->filesem for writing. |
||||
*/ |
||||
|
||||
static int fsg_lun_open(struct fsg_lun *curlun, const char *filename) |
||||
{ |
||||
int ro; |
||||
int rc = -EINVAL; |
||||
loff_t size; |
||||
loff_t num_sectors; |
||||
loff_t min_sectors; |
||||
|
||||
/* R/W if we can, R/O if we must */ |
||||
ro = curlun->initially_ro; |
||||
|
||||
ums_info->get_capacity(&(ums_info->ums_dev), &size); |
||||
if (size < 0) { |
||||
printf("unable to find file size: %s\n", filename); |
||||
rc = (int) size; |
||||
goto out; |
||||
} |
||||
num_sectors = size >> 9; /* File size in 512-byte blocks */ |
||||
min_sectors = 1; |
||||
if (num_sectors < min_sectors) { |
||||
printf("file too small: %s\n", filename); |
||||
rc = -ETOOSMALL; |
||||
goto out; |
||||
} |
||||
|
||||
curlun->ro = ro; |
||||
curlun->file_length = size; |
||||
curlun->num_sectors = num_sectors; |
||||
debug("open backing file: %s\n", filename); |
||||
rc = 0; |
||||
|
||||
out: |
||||
return rc; |
||||
} |
||||
|
||||
static void fsg_lun_close(struct fsg_lun *curlun) |
||||
{ |
||||
} |
||||
|
||||
/*-------------------------------------------------------------------------*/ |
||||
|
||||
/*
|
||||
* Sync the file data, don't bother with the metadata. |
||||
* This code was copied from fs/buffer.c:sys_fdatasync(). |
||||
*/ |
||||
static int fsg_lun_fsync_sub(struct fsg_lun *curlun) |
||||
{ |
||||
return 0; |
||||
} |
||||
|
||||
static void store_cdrom_address(u8 *dest, int msf, u32 addr) |
||||
{ |
||||
if (msf) { |
||||
/* Convert to Minutes-Seconds-Frames */ |
||||
addr >>= 2; /* Convert to 2048-byte frames */ |
||||
addr += 2*75; /* Lead-in occupies 2 seconds */ |
||||
dest[3] = addr % 75; /* Frames */ |
||||
addr /= 75; |
||||
dest[2] = addr % 60; /* Seconds */ |
||||
addr /= 60; |
||||
dest[1] = addr; /* Minutes */ |
||||
dest[0] = 0; /* Reserved */ |
||||
} else { |
||||
/* Absolute sector */ |
||||
put_unaligned_be32(addr, dest); |
||||
} |
||||
} |
||||
|
||||
/*-------------------------------------------------------------------------*/ |
Loading…
Reference in new issue