kernel/drivers/usb/gadget/function/f_mass_storage.h

   1 #ifndef USB_F_MASS_STORAGE_H
   2 #define USB_F_MASS_STORAGE_H
   3
   4 #include <linux/usb/composite.h>
   5 #include "storage_common.h"
   6
   7 struct fsg_module_parameters {
   8         char            *file[FSG_MAX_LUNS];
   9         bool            ro[FSG_MAX_LUNS];
  10         bool            removable[FSG_MAX_LUNS];
  11         bool            cdrom[FSG_MAX_LUNS];
  12         bool            nofua[FSG_MAX_LUNS];
  13
  14         unsigned int    file_count, ro_count, removable_count, cdrom_count;
  15         unsigned int    nofua_count;
  16         unsigned int    luns;   /* nluns */
  17         bool            stall;  /* can_stall */
  18 };
  19
  20 #define _FSG_MODULE_PARAM_ARRAY(prefix, params, name, type, desc)       \
  21         module_param_array_named(prefix ## name, params.name, type,     \
  22                                  &prefix ## params.name ## _count,      \
  23                                  S_IRUGO);                              \
  24         MODULE_PARM_DESC(prefix ## name, desc)
  25
  26 #define _FSG_MODULE_PARAM(prefix, params, name, type, desc)             \
  27         module_param_named(prefix ## name, params.name, type,           \
  28                            S_IRUGO);                                    \
  29         MODULE_PARM_DESC(prefix ## name, desc)
  30
  31 #define __FSG_MODULE_PARAMETERS(prefix, params)                         \
  32         _FSG_MODULE_PARAM_ARRAY(prefix, params, file, charp,            \
  33                                 "names of backing files or devices");   \
  34         _FSG_MODULE_PARAM_ARRAY(prefix, params, ro, bool,               \
  35                                 "true to force read-only");             \
  36         _FSG_MODULE_PARAM_ARRAY(prefix, params, removable, bool,        \
  37                                 "true to simulate removable media");    \
  38         _FSG_MODULE_PARAM_ARRAY(prefix, params, cdrom, bool,            \
  39                                 "true to simulate CD-ROM instead of disk"); \
  40         _FSG_MODULE_PARAM_ARRAY(prefix, params, nofua, bool,            \
  41                                 "true to ignore SCSI WRITE(10,12) FUA bit"); \
  42         _FSG_MODULE_PARAM(prefix, params, luns, uint,                   \
  43                           "number of LUNs");                            \
  44         _FSG_MODULE_PARAM(prefix, params, stall, bool,                  \
  45                           "false to prevent bulk stalls")
  46
  47 #ifdef CONFIG_USB_GADGET_DEBUG_FILES
  48
  49 #define FSG_MODULE_PARAMETERS(prefix, params)                           \
  50         __FSG_MODULE_PARAMETERS(prefix, params);                        \
  51         module_param_named(num_buffers, fsg_num_buffers, uint, S_IRUGO);\
  52         MODULE_PARM_DESC(num_buffers, "Number of pipeline buffers")
  53 #else
  54
  55 #define FSG_MODULE_PARAMETERS(prefix, params)                           \
  56         __FSG_MODULE_PARAMETERS(prefix, params)
  57
  58 #endif
  59
  60 struct fsg_common;
  61
  62 /* FSF callback functions */
  63 struct fsg_operations {
  64         /*
  65          * Callback function to call when thread exits.  If no
  66          * callback is set or it returns value lower then zero MSF
  67          * will force eject all LUNs it operates on (including those
  68          * marked as non-removable or with prevent_medium_removal flag
  69          * set).
  70          */
  71         int (*thread_exits)(struct fsg_common *common);
  72 };
  73
  74 struct fsg_lun_opts {
  75         struct config_group group;
  76         struct fsg_lun *lun;
  77         int lun_id;
  78 };
  79
  80 struct fsg_opts {
  81         struct fsg_common *common;
  82         struct usb_function_instance func_inst;
  83         struct fsg_lun_opts lun0;
  84         struct config_group *default_groups[2];
  85         bool no_configfs; /* for legacy gadgets */
  86
  87         /*
  88          * Read/write access to configfs attributes is handled by configfs.
  89          *
  90          * This is to protect the data from concurrent access by read/write
  91          * and create symlink/remove symlink.
  92          */
  93         struct mutex                    lock;
  94         int                             refcnt;
  95 };
  96
  97 struct fsg_lun_config {
  98         const char *filename;
  99         char ro;
 100         char removable;
 101         char cdrom;
 102         char nofua;
 103 };
 104
 105 struct fsg_config {
 106         unsigned nluns;
 107         struct fsg_lun_config luns[FSG_MAX_LUNS];
 108
 109         /* Callback functions. */
 110         const struct fsg_operations     *ops;
 111         /* Gadget's private data. */
 112         void                    *private_data;
 113
 114         const char *vendor_name;                /*  8 characters or less */
 115         const char *product_name;               /* 16 characters or less */
 116
 117         char                    can_stall;
 118         unsigned int            fsg_num_buffers;
 119 };
 120
 121 static inline struct fsg_opts *
 122 fsg_opts_from_func_inst(const struct usb_function_instance *fi)
 123 {
 124         return container_of(fi, struct fsg_opts, func_inst);
 125 }
 126
 127 void fsg_common_get(struct fsg_common *common);
 128
 129 void fsg_common_put(struct fsg_common *common);
 130
 131 void fsg_common_set_sysfs(struct fsg_common *common, bool sysfs);
 132
 133 int fsg_common_set_num_buffers(struct fsg_common *common, unsigned int n);
 134
 135 void fsg_common_free_buffers(struct fsg_common *common);
 136
 137 int fsg_common_set_cdev(struct fsg_common *common,
 138                         struct usb_composite_dev *cdev, bool can_stall);
 139
 140 void fsg_common_remove_lun(struct fsg_lun *lun, bool sysfs);
 141
 142 void fsg_common_remove_luns(struct fsg_common *common);
 143
 144 void fsg_common_free_luns(struct fsg_common *common);
 145
 146 int fsg_common_set_nluns(struct fsg_common *common, int nluns);
 147
 148 void fsg_common_set_ops(struct fsg_common *common,
 149                         const struct fsg_operations *ops);
 150
 151 int fsg_common_create_lun(struct fsg_common *common, struct fsg_lun_config *cfg,
 152                           unsigned int id, const char *name,
 153                           const char **name_pfx);
 154
 155 int fsg_common_create_luns(struct fsg_common *common, struct fsg_config *cfg);
 156
 157 void fsg_common_set_inquiry_string(struct fsg_common *common, const char *vn,
 158                                    const char *pn);
 159
 160 int fsg_common_run_thread(struct fsg_common *common);
 161
 162 void fsg_config_from_params(struct fsg_config *cfg,
 163                             const struct fsg_module_parameters *params,
 164                             unsigned int fsg_num_buffers);
 165
 166 #endif /* USB_F_MASS_STORAGE_H */