drivers/usb/gadget/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_opts {
  75         struct fsg_common *common;
  76         struct usb_function_instance func_inst;
  77         bool no_configfs; /* for legacy gadgets */
  78 };
  79
  80 struct fsg_lun_config {
  81         const char *filename;
  82         char ro;
  83         char removable;
  84         char cdrom;
  85         char nofua;
  86 };
  87
  88 struct fsg_config {
  89         unsigned nluns;
  90         struct fsg_lun_config luns[FSG_MAX_LUNS];
  91
  92         /* Callback functions. */
  93         const struct fsg_operations     *ops;
  94         /* Gadget's private data. */
  95         void                    *private_data;
  96
  97         const char *vendor_name;                /*  8 characters or less */
  98         const char *product_name;               /* 16 characters or less */
  99
 100         char                    can_stall;
 101         unsigned int            fsg_num_buffers;
 102 };
 103
 104 static inline struct fsg_opts *
 105 fsg_opts_from_func_inst(const struct usb_function_instance *fi)
 106 {
 107         return container_of(fi, struct fsg_opts, func_inst);
 108 }
 109
 110 void fsg_common_get(struct fsg_common *common);
 111
 112 void fsg_common_put(struct fsg_common *common);
 113
 114 struct fsg_common *fsg_common_init(struct fsg_common *common,
 115                                    struct usb_composite_dev *cdev,
 116                                    struct fsg_config *cfg);
 117
 118 void fsg_common_set_sysfs(struct fsg_common *common, bool sysfs);
 119
 120 int fsg_common_set_num_buffers(struct fsg_common *common, unsigned int n);
 121
 122 void fsg_common_free_buffers(struct fsg_common *common);
 123
 124 int fsg_common_set_cdev(struct fsg_common *common,
 125                         struct usb_composite_dev *cdev, bool can_stall);
 126
 127 void fsg_common_remove_lun(struct fsg_lun *lun, bool sysfs);
 128
 129 void fsg_common_remove_luns(struct fsg_common *common);
 130
 131 void fsg_common_free_luns(struct fsg_common *common);
 132
 133 int fsg_common_set_nluns(struct fsg_common *common, int nluns);
 134
 135 int fsg_common_create_lun(struct fsg_common *common, struct fsg_lun_config *cfg,
 136                           unsigned int id, const char *name,
 137                           const char **name_pfx);
 138
 139 int fsg_common_create_luns(struct fsg_common *common, struct fsg_config *cfg);
 140
 141 void fsg_common_set_inquiry_string(struct fsg_common *common, const char *vn,
 142                                    const char *pn);
 143
 144 int fsg_common_run_thread(struct fsg_common *common);
 145
 146 void fsg_config_from_params(struct fsg_config *cfg,
 147                             const struct fsg_module_parameters *params,
 148                             unsigned int fsg_num_buffers);
 149
 150 static inline struct fsg_common *
 151 fsg_common_from_params(struct fsg_common *common,
 152                        struct usb_composite_dev *cdev,
 153                        const struct fsg_module_parameters *params,
 154                        unsigned int fsg_num_buffers)
 155         __attribute__((unused));
 156 static inline struct fsg_common *
 157 fsg_common_from_params(struct fsg_common *common,
 158                        struct usb_composite_dev *cdev,
 159                        const struct fsg_module_parameters *params,
 160                        unsigned int fsg_num_buffers)
 161 {
 162         struct fsg_config cfg;
 163         fsg_config_from_params(&cfg, params, fsg_num_buffers);
 164         return fsg_common_init(common, cdev, &cfg);
 165 }
 166
 167 #endif /* USB_F_MASS_STORAGE_H */