1/* SPDX-License-Identifier: GPL-2.0 */
2#ifndef USB_F_MASS_STORAGE_H
3#define USB_F_MASS_STORAGE_H
4
5#include <linux/usb/composite.h>
6#include "storage_common.h"
7
8struct fsg_module_parameters {
9 char *file[FSG_MAX_LUNS];
10 bool ro[FSG_MAX_LUNS];
11 bool removable[FSG_MAX_LUNS];
12 bool cdrom[FSG_MAX_LUNS];
13 bool nofua[FSG_MAX_LUNS];
14
15 unsigned int file_count, ro_count, removable_count, cdrom_count;
16 unsigned int nofua_count;
17 unsigned int luns; /* nluns */
18 bool stall; /* can_stall */
19};
20
21#define _FSG_MODULE_PARAM_ARRAY(prefix, params, name, type, desc) \
22 module_param_array_named(prefix ## name, params.name, type, \
23 &prefix ## params.name ## _count, \
24 S_IRUGO); \
25 MODULE_PARM_DESC(prefix ## name, desc)
26
27#define _FSG_MODULE_PARAM(prefix, params, name, type, desc) \
28 module_param_named(prefix ## name, params.name, type, \
29 S_IRUGO); \
30 MODULE_PARM_DESC(prefix ## name, desc)
31
32#define __FSG_MODULE_PARAMETERS(prefix, params) \
33 _FSG_MODULE_PARAM_ARRAY(prefix, params, file, charp, \
34 "names of backing files or devices"); \
35 _FSG_MODULE_PARAM_ARRAY(prefix, params, ro, bool, \
36 "true to force read-only"); \
37 _FSG_MODULE_PARAM_ARRAY(prefix, params, removable, bool, \
38 "true to simulate removable media"); \
39 _FSG_MODULE_PARAM_ARRAY(prefix, params, cdrom, bool, \
40 "true to simulate CD-ROM instead of disk"); \
41 _FSG_MODULE_PARAM_ARRAY(prefix, params, nofua, bool, \
42 "true to ignore SCSI WRITE(10,12) FUA bit"); \
43 _FSG_MODULE_PARAM(prefix, params, luns, uint, \
44 "number of LUNs"); \
45 _FSG_MODULE_PARAM(prefix, params, stall, bool, \
46 "false to prevent bulk stalls")
47
48#ifdef CONFIG_USB_GADGET_DEBUG_FILES
49
50#define FSG_MODULE_PARAMETERS(prefix, params) \
51 __FSG_MODULE_PARAMETERS(prefix, params); \
52 module_param_named(num_buffers, fsg_num_buffers, uint, S_IRUGO);\
53 MODULE_PARM_DESC(num_buffers, "Number of pipeline buffers")
54#else
55
56#define FSG_MODULE_PARAMETERS(prefix, params) \
57 __FSG_MODULE_PARAMETERS(prefix, params)
58
59#endif
60
61struct fsg_common;
62
63/* FSF callback functions */
64struct fsg_lun_opts {
65 struct config_group group;
66 struct fsg_lun *lun;
67 int lun_id;
68};
69
70struct fsg_opts {
71 struct fsg_common *common;
72 struct usb_function_instance func_inst;
73 struct fsg_lun_opts lun0;
74 struct config_group *default_groups[2];
75 bool no_configfs; /* for legacy gadgets */
76
77 /*
78 * Read/write access to configfs attributes is handled by configfs.
79 *
80 * This is to protect the data from concurrent access by read/write
81 * and create symlink/remove symlink.
82 */
83 struct mutex lock;
84 int refcnt;
85};
86
87struct fsg_lun_config {
88 const char *filename;
89 char ro;
90 char removable;
91 char cdrom;
92 char nofua;
93 char inquiry_string[INQUIRY_STRING_LEN];
94};
95
96struct fsg_config {
97 unsigned nluns;
98 struct fsg_lun_config luns[FSG_MAX_LUNS];
99
100 /* Callback functions. */
101 const struct fsg_operations *ops;
102 /* Gadget's private data. */
103 void *private_data;
104
105 const char *vendor_name; /* 8 characters or less */
106 const char *product_name; /* 16 characters or less */
107
108 char can_stall;
109 unsigned int fsg_num_buffers;
110};
111
112static inline struct fsg_opts *
113fsg_opts_from_func_inst(struct usb_function_instance *fi)
114{
115 return container_of(fi, struct fsg_opts, func_inst);
116}
117
118void fsg_common_set_sysfs(struct fsg_common *common, bool sysfs);
119
120int fsg_common_set_num_buffers(struct fsg_common *common, unsigned int n);
121
122void fsg_common_free_buffers(struct fsg_common *common);
123
124int fsg_common_set_cdev(struct fsg_common *common,
125 struct usb_composite_dev *cdev, bool can_stall);
126
127void fsg_common_remove_lun(struct fsg_lun *lun);
128
129void fsg_common_remove_luns(struct fsg_common *common);
130
131int fsg_common_create_lun(struct fsg_common *common, struct fsg_lun_config *cfg,
132 unsigned int id, const char *name,
133 const char **name_pfx);
134
135int fsg_common_create_luns(struct fsg_common *common, struct fsg_config *cfg);
136
137void fsg_common_set_inquiry_string(struct fsg_common *common, const char *vn,
138 const char *pn);
139
140void fsg_config_from_params(struct fsg_config *cfg,
141 const struct fsg_module_parameters *params,
142 unsigned int fsg_num_buffers);
143
144#endif /* USB_F_MASS_STORAGE_H */
145

source code of linux/drivers/usb/gadget/function/f_mass_storage.h