drivers/usb/gadget/function/storage_common.h

   1 /* SPDX-License-Identifier: GPL-2.0 */
   2 #ifndef USB_STORAGE_COMMON_H
   3 #define USB_STORAGE_COMMON_H
   4
   5 #include <linux/device.h>
   6 #include <linux/usb/storage.h>
   7 #include <scsi/scsi.h>
   8 #include <asm/unaligned.h>
   9
  10 #ifndef DEBUG
  11 #undef VERBOSE_DEBUG
  12 #undef DUMP_MSGS
  13 #endif /* !DEBUG */
  14
  15 #ifdef VERBOSE_DEBUG
  16 #define VLDBG   LDBG
  17 #else
  18 #define VLDBG(lun, fmt, args...) do { } while (0)
  19 #endif /* VERBOSE_DEBUG */
  20
  21 #define _LMSG(func, lun, fmt, args...)                                  \
  22         do {                                                            \
  23                 if ((lun)->name_pfx && *(lun)->name_pfx)                \
  24                         func("%s/%s: " fmt, *(lun)->name_pfx,           \
  25                                  (lun)->name, ## args);                 \
  26                 else                                                    \
  27                         func("%s: " fmt, (lun)->name, ## args);         \
  28         } while (0)
  29
  30 #define LDBG(lun, fmt, args...)         _LMSG(pr_debug, lun, fmt, ## args)
  31 #define LERROR(lun, fmt, args...)       _LMSG(pr_err, lun, fmt, ## args)
  32 #define LWARN(lun, fmt, args...)        _LMSG(pr_warn, lun, fmt, ## args)
  33 #define LINFO(lun, fmt, args...)        _LMSG(pr_info, lun, fmt, ## args)
  34
  35
  36 #ifdef DUMP_MSGS
  37
  38 #  define dump_msg(fsg, /* const char * */ label,                       \
  39                    /* const u8 * */ buf, /* unsigned */ length)         \
  40 do {                                                                    \
  41         if (length < 512) {                                             \
  42                 DBG(fsg, "%s, length %u:\n", label, length);            \
  43                 print_hex_dump(KERN_DEBUG, "", DUMP_PREFIX_OFFSET,      \
  44                                16, 1, buf, length, 0);                  \
  45         }                                                               \
  46 } while (0)
  47
  48 #  define dump_cdb(fsg) do { } while (0)
  49
  50 #else
  51
  52 #  define dump_msg(fsg, /* const char * */ label, \
  53                    /* const u8 * */ buf, /* unsigned */ length) do { } while (0)
  54
  55 #  ifdef VERBOSE_DEBUG
  56
  57 #    define dump_cdb(fsg)                                               \
  58         print_hex_dump(KERN_DEBUG, "SCSI CDB: ", DUMP_PREFIX_NONE,      \
  59                        16, 1, (fsg)->cmnd, (fsg)->cmnd_size, 0)         \
  60
  61 #  else
  62
  63 #    define dump_cdb(fsg) do { } while (0)
  64
  65 #  endif /* VERBOSE_DEBUG */
  66
  67 #endif /* DUMP_MSGS */
  68
  69 /* Length of a SCSI Command Data Block */
  70 #define MAX_COMMAND_SIZE        16
  71
  72 /* SCSI Sense Key/Additional Sense Code/ASC Qualifier values */
  73 #define SS_NO_SENSE                             0
  74 #define SS_COMMUNICATION_FAILURE                0x040800
  75 #define SS_INVALID_COMMAND                      0x052000
  76 #define SS_INVALID_FIELD_IN_CDB                 0x052400
  77 #define SS_LOGICAL_BLOCK_ADDRESS_OUT_OF_RANGE   0x052100
  78 #define SS_LOGICAL_UNIT_NOT_SUPPORTED           0x052500
  79 #define SS_MEDIUM_NOT_PRESENT                   0x023a00
  80 #define SS_MEDIUM_REMOVAL_PREVENTED             0x055302
  81 #define SS_NOT_READY_TO_READY_TRANSITION        0x062800
  82 #define SS_RESET_OCCURRED                       0x062900
  83 #define SS_SAVING_PARAMETERS_NOT_SUPPORTED      0x053900
  84 #define SS_UNRECOVERED_READ_ERROR               0x031100
  85 #define SS_WRITE_ERROR                          0x030c02
  86 #define SS_WRITE_PROTECTED                      0x072700
  87
  88 #define SK(x)           ((u8) ((x) >> 16))      /* Sense Key byte, etc. */
  89 #define ASC(x)          ((u8) ((x) >> 8))
  90 #define ASCQ(x)         ((u8) (x))
  91
  92 /*
  93  * Vendor (8 chars), product (16 chars), release (4 hexadecimal digits) and NUL
  94  * byte
  95  */
  96 #define INQUIRY_STRING_LEN ((size_t) (8 + 16 + 4 + 1))
  97
  98 struct fsg_lun {
  99         struct file     *filp;
 100         loff_t          file_length;
 101         loff_t          num_sectors;
 102
 103         unsigned int    initially_ro:1;
 104         unsigned int    ro:1;
 105         unsigned int    removable:1;
 106         unsigned int    cdrom:1;
 107         unsigned int    prevent_medium_removal:1;
 108         unsigned int    registered:1;
 109         unsigned int    info_valid:1;
 110         unsigned int    nofua:1;
 111
 112         u32             sense_data;
 113         u32             sense_data_info;
 114         u32             unit_attention_data;
 115
 116         unsigned int    blkbits; /* Bits of logical block size
 117                                                        of bound block device */
 118         unsigned int    blksize; /* logical block size of bound block device */
 119         struct device   dev;
 120         const char      *name;          /* "lun.name" */
 121         const char      **name_pfx;     /* "function.name" */
 122         char            inquiry_string[INQUIRY_STRING_LEN];
 123 };
 124
 125 static inline bool fsg_lun_is_open(struct fsg_lun *curlun)
 126 {
 127         return curlun->filp != NULL;
 128 }
 129
 130 /* Default size of buffer length. */
 131 #define FSG_BUFLEN      ((u32)16384)
 132
 133 /* Maximal number of LUNs supported in mass storage function */
 134 #define FSG_MAX_LUNS    16
 135
 136 enum fsg_buffer_state {
 137         BUF_STATE_SENDING = -2,
 138         BUF_STATE_RECEIVING,
 139         BUF_STATE_EMPTY = 0,
 140         BUF_STATE_FULL
 141 };
 142
 143 struct fsg_buffhd {
 144         void                            *buf;
 145         enum fsg_buffer_state           state;
 146         struct fsg_buffhd               *next;
 147
 148         /*
 149          * The NetChip 2280 is faster, and handles some protocol faults
 150          * better, if we don't submit any short bulk-out read requests.
 151          * So we will record the intended request length here.
 152          */
 153         unsigned int                    bulk_out_intended_length;
 154
 155         struct usb_request              *inreq;
 156         struct usb_request              *outreq;
 157 };
 158
 159 enum fsg_state {
 160         FSG_STATE_NORMAL,
 161         FSG_STATE_ABORT_BULK_OUT,
 162         FSG_STATE_PROTOCOL_RESET,
 163         FSG_STATE_CONFIG_CHANGE,
 164         FSG_STATE_EXIT,
 165         FSG_STATE_TERMINATED
 166 };
 167
 168 enum data_direction {
 169         DATA_DIR_UNKNOWN = 0,
 170         DATA_DIR_FROM_HOST,
 171         DATA_DIR_TO_HOST,
 172         DATA_DIR_NONE
 173 };
 174
 175 static inline u32 get_unaligned_be24(u8 *buf)
 176 {
 177         return 0xffffff & (u32) get_unaligned_be32(buf - 1);
 178 }
 179
 180 static inline struct fsg_lun *fsg_lun_from_dev(struct device *dev)
 181 {
 182         return container_of(dev, struct fsg_lun, dev);
 183 }
 184
 185 enum {
 186         FSG_STRING_INTERFACE
 187 };
 188
 189 extern struct usb_interface_descriptor fsg_intf_desc;
 190
 191 extern struct usb_endpoint_descriptor fsg_fs_bulk_in_desc;
 192 extern struct usb_endpoint_descriptor fsg_fs_bulk_out_desc;
 193 extern struct usb_descriptor_header *fsg_fs_function[];
 194
 195 extern struct usb_endpoint_descriptor fsg_hs_bulk_in_desc;
 196 extern struct usb_endpoint_descriptor fsg_hs_bulk_out_desc;
 197 extern struct usb_descriptor_header *fsg_hs_function[];
 198
 199 extern struct usb_endpoint_descriptor fsg_ss_bulk_in_desc;
 200 extern struct usb_ss_ep_comp_descriptor fsg_ss_bulk_in_comp_desc;
 201 extern struct usb_endpoint_descriptor fsg_ss_bulk_out_desc;
 202 extern struct usb_ss_ep_comp_descriptor fsg_ss_bulk_out_comp_desc;
 203 extern struct usb_descriptor_header *fsg_ss_function[];
 204
 205 void fsg_lun_close(struct fsg_lun *curlun);
 206 int fsg_lun_open(struct fsg_lun *curlun, const char *filename);
 207 int fsg_lun_fsync_sub(struct fsg_lun *curlun);
 208 void store_cdrom_address(u8 *dest, int msf, u32 addr);
 209 ssize_t fsg_show_ro(struct fsg_lun *curlun, char *buf);
 210 ssize_t fsg_show_nofua(struct fsg_lun *curlun, char *buf);
 211 ssize_t fsg_show_file(struct fsg_lun *curlun, struct rw_semaphore *filesem,
 212                       char *buf);
 213 ssize_t fsg_show_inquiry_string(struct fsg_lun *curlun, char *buf);
 214 ssize_t fsg_show_cdrom(struct fsg_lun *curlun, char *buf);
 215 ssize_t fsg_show_removable(struct fsg_lun *curlun, char *buf);
 216 ssize_t fsg_store_ro(struct fsg_lun *curlun, struct rw_semaphore *filesem,
 217                      const char *buf, size_t count);
 218 ssize_t fsg_store_nofua(struct fsg_lun *curlun, const char *buf, size_t count);
 219 ssize_t fsg_store_file(struct fsg_lun *curlun, struct rw_semaphore *filesem,
 220                        const char *buf, size_t count);
 221 ssize_t fsg_store_cdrom(struct fsg_lun *curlun, struct rw_semaphore *filesem,
 222                         const char *buf, size_t count);
 223 ssize_t fsg_store_removable(struct fsg_lun *curlun, const char *buf,
 224                             size_t count);
 225 ssize_t fsg_store_inquiry_string(struct fsg_lun *curlun, const char *buf,
 226                                  size_t count);
 227
 228 #endif /* USB_STORAGE_COMMON_H */