Converting FunctionFS to the new function interface requires converting
the USB FunctionFS's function code and its users.
This patch converts the f_fs.c to the new function interface.
The file is now compiled into a separate usb_f_fs.ko module.
The old function interface is provided by means of preprocessor
conditional directives. After all users are converted, the old interface
can be removed.
Signed-off-by: Andrzej Pietrasiewicz <andrze...@samsung.com>
Signed-off-by: Kyungmin Park <kyungmin.p...@samsung.com>
---
drivers/usb/gadget/Kconfig | 3 +
drivers/usb/gadget/Makefile | 2 +
drivers/usb/gadget/f_fs.c | 355 +++++++++++++++----------------------------
drivers/usb/gadget/f_fs.h | 246 ++++++++++++++++++++++++++++++
drivers/usb/gadget/g_ffs.c | 19 +++-
5 files changed, 391 insertions(+), 234 deletions(-)
create mode 100644 drivers/usb/gadget/f_fs.h
diff --git a/drivers/usb/gadget/Kconfig b/drivers/usb/gadget/Kconfig
index acadde2..0d3d87a 100644
--- a/drivers/usb/gadget/Kconfig
+++ b/drivers/usb/gadget/Kconfig
@@ -578,6 +578,9 @@ config USB_F_SUBSET
config USB_F_RNDIS
tristate
+config USB_F_FS
+ tristate
+
choice
tristate "USB Gadget Drivers"
default USB_ETH
diff --git a/drivers/usb/gadget/Makefile b/drivers/usb/gadget/Makefile
index 6f9f4d9..65fbaf1 100644
--- a/drivers/usb/gadget/Makefile
+++ b/drivers/usb/gadget/Makefile
@@ -95,3 +95,5 @@ usb_f_ecm_subset-y := f_subset.o
obj-$(CONFIG_USB_F_ECM) += usb_f_ecm_subset.o
usb_f_rndis-y := f_rndis.o rndis.o
obj-$(CONFIG_USB_F_RNDIS) += usb_f_rndis.o
+usb_f_fs-y := f_fs.o
+obj-$(CONFIG_USB_F_FS) += usb_f_fs.o
diff --git a/drivers/usb/gadget/f_fs.c b/drivers/usb/gadget/f_fs.c
index f5a66e9..38ba133 100644
--- a/drivers/usb/gadget/f_fs.c
+++ b/drivers/usb/gadget/f_fs.c
@@ -18,6 +18,7 @@
/* #define DEBUG */
/* #define VERBOSE_DEBUG */
+#include <linux/module.h>
#include <linux/blkdev.h>
#include <linux/pagemap.h>
#include <linux/export.h>
@@ -27,241 +28,23 @@
#include <linux/usb/composite.h>
#include <uapi/linux/usb/functionfs.h>
+#include "f_fs.h"
#define FUNCTIONFS_MAGIC 0xa647361 /* Chosen by a honest dice roll ;) */
-
-/* Debugging ****************************************************************/
-
-#ifdef VERBOSE_DEBUG
-#ifndef pr_vdebug
-# define pr_vdebug pr_debug
-#endif /* pr_vdebug */
-# define ffs_dump_mem(prefix, ptr, len) \
- print_hex_dump_bytes(pr_fmt(prefix ": "), DUMP_PREFIX_NONE, ptr, len)
-#else
-#ifndef pr_vdebug
-# define pr_vdebug(...) do { } while (0)
-#endif /* pr_vdebug */
-# define ffs_dump_mem(prefix, ptr, len) do { } while (0)
-#endif /* VERBOSE_DEBUG */
-
-#define ENTER() pr_vdebug("%s()\n", __func__)
-
struct ffs_data;
struct usb_composite_dev;
struct usb_configuration;
-
-static int functionfs_init(void) __attribute__((warn_unused_result));
-static void functionfs_cleanup(void);
-
-static int functionfs_bind(struct ffs_data *ffs, struct usb_composite_dev
*cdev)
- __attribute__((warn_unused_result, nonnull));
-static void functionfs_unbind(struct ffs_data *ffs)
- __attribute__((nonnull));
+#ifdef USB_FFS_INCLUDED
static int functionfs_bind_config(struct usb_composite_dev *cdev,
struct usb_configuration *c,
struct ffs_data *ffs)
__attribute__((warn_unused_result, nonnull));
+#endif
-static int functionfs_ready_callback(struct ffs_data *ffs)
- __attribute__((warn_unused_result, nonnull));
-static void functionfs_closed_callback(struct ffs_data *ffs)
- __attribute__((nonnull));
-static void *functionfs_acquire_dev_callback(const char *dev_name)
- __attribute__((warn_unused_result, nonnull));
-static void functionfs_release_dev_callback(struct ffs_data *ffs_data)
- __attribute__((nonnull));
-
-/* The data structure and setup file ****************************************/
-
-enum ffs_state {
- /*
- * Waiting for descriptors and strings.
- *
- * In this state no open(2), read(2) or write(2) on epfiles
- * may succeed (which should not be the problem as there
- * should be no such files opened in the first place).
- */
- FFS_READ_DESCRIPTORS,
- FFS_READ_STRINGS,
-
- /*
- * We've got descriptors and strings. We are or have called
- * functionfs_ready_callback(). functionfs_bind() may have
- * been called but we don't know.
- *
- * This is the only state in which operations on epfiles may
- * succeed.
- */
- FFS_ACTIVE,
-
- /*
- * All endpoints have been closed. This state is also set if
- * we encounter an unrecoverable error. The only
- * unrecoverable error is situation when after reading strings
- * from user space we fail to initialise epfiles or
- * functionfs_ready_callback() returns with error (<0).
- *
- * In this state no open(2), read(2) or write(2) (both on ep0
- * as well as epfile) may succeed (at this point epfiles are
- * unlinked and all closed so this is not a problem; ep0 is
- * also closed but ep0 file exists and so open(2) on ep0 must
- * fail).
- */
- FFS_CLOSING
-};
-
-
-enum ffs_setup_state {
- /* There is no setup request pending. */
- FFS_NO_SETUP,
- /*
- * User has read events and there was a setup request event
- * there. The next read/write on ep0 will handle the
- * request.
- */
- FFS_SETUP_PENDING,
- /*
- * There was event pending but before user space handled it
- * some other event was introduced which canceled existing
- * setup. If this state is set read/write on ep0 return
- * -EIDRM. This state is only set when adding event.
- */
- FFS_SETUP_CANCELED
-};
-
-
-
-struct ffs_epfile;
-struct ffs_function;
-
-struct ffs_data {
- struct usb_gadget *gadget;
-
- /*
- * Protect access read/write operations, only one read/write
- * at a time. As a consequence protects ep0req and company.
- * While setup request is being processed (queued) this is
- * held.
- */
- struct mutex mutex;
-
- /*
- * Protect access to endpoint related structures (basically
- * usb_ep_queue(), usb_ep_dequeue(), etc. calls) except for
- * endpoint zero.
- */
- spinlock_t eps_lock;
-
- /*
- * XXX REVISIT do we need our own request? Since we are not
- * handling setup requests immediately user space may be so
- * slow that another setup will be sent to the gadget but this
- * time not to us but another function and then there could be
- * a race. Is that the case? Or maybe we can use cdev->req
- * after all, maybe we just need some spinlock for that?
- */
- struct usb_request *ep0req; /* P: mutex */
- struct completion ep0req_completion; /* P: mutex */
- int ep0req_status; /* P: mutex */
-
- /* reference counter */
- atomic_t ref;
- /* how many files are opened (EP0 and others) */
- atomic_t opened;
-
- /* EP0 state */
- enum ffs_state state;
-
- /*
- * Possible transitions:
- * + FFS_NO_SETUP -> FFS_SETUP_PENDING -- P: ev.waitq.lock
- * happens only in ep0 read which is P: mutex
- * + FFS_SETUP_PENDING -> FFS_NO_SETUP -- P: ev.waitq.lock
- * happens only in ep0 i/o which is P: mutex
- * + FFS_SETUP_PENDING -> FFS_SETUP_CANCELED -- P: ev.waitq.lock
- * + FFS_SETUP_CANCELED -> FFS_NO_SETUP -- cmpxchg
- */
- enum ffs_setup_state setup_state;
-
-#define FFS_SETUP_STATE(ffs) \
- ((enum ffs_setup_state)cmpxchg(&(ffs)->setup_state, \
- FFS_SETUP_CANCELED, FFS_NO_SETUP))
-
- /* Events & such. */
- struct {
- u8 types[4];
- unsigned short count;
- /* XXX REVISIT need to update it in some places, or do we? */
- unsigned short can_stall;
- struct usb_ctrlrequest setup;
-
- wait_queue_head_t waitq;
- } ev; /* the whole structure, P: ev.waitq.lock */
-
- /* Flags */
- unsigned long flags;
-#define FFS_FL_CALL_CLOSED_CALLBACK 0
-#define FFS_FL_BOUND 1
-
- /* Active function */
- struct ffs_function *func;
-
- /*
- * Device name, write once when file system is mounted.
- * Intended for user to read if she wants.
- */
- const char *dev_name;
- /* Private data for our user (ie. gadget). Managed by user. */
- void *private_data;
-
- /* filled by __ffs_data_got_descs() */
- /*
- * Real descriptors are 16 bytes after raw_descs (so you need
- * to skip 16 bytes (ie. ffs->raw_descs + 16) to get to the
- * first full speed descriptor). raw_descs_length and
- * raw_fs_descs_length do not have those 16 bytes added.
- */
- const void *raw_descs;
- unsigned raw_descs_length;
- unsigned raw_fs_descs_length;
- unsigned fs_descs_count;
- unsigned hs_descs_count;
-
- unsigned short strings_count;
- unsigned short interfaces_count;
- unsigned short eps_count;
- unsigned short _pad1;
-
- /* filled by __ffs_data_got_strings() */
- /* ids in stringtabs are set in functionfs_bind() */
- const void *raw_strings;
- struct usb_gadget_strings **stringtabs;
-
- /*
- * File system's super block, write once when file system is
- * mounted.
- */
- struct super_block *sb;
-
- /* File permissions, written once when fs is mounted */
- struct ffs_file_perms {
- umode_t mode;
- kuid_t uid;
- kgid_t gid;
- } file_perms;
-
- /*
- * The endpoint files, filled by ffs_epfiles_create(),
- * destroyed by ffs_epfiles_destroy().
- */
- struct ffs_epfile *epfiles;
-};
-
/* Reference counter handling */
static void ffs_data_get(struct ffs_data *ffs);
static void ffs_data_put(struct ffs_data *ffs);
@@ -321,6 +104,12 @@ static void ffs_func_resume(struct usb_function *);
static int ffs_func_revmap_ep(struct ffs_function *func, u8 num);
static int ffs_func_revmap_intf(struct ffs_function *func, u8 intf);
+/* FunctionFS callbacks *****************************************************/
+
+static int (*ffs_ready_cb)(struct ffs_data *ffs);
+static void (*ffs_closed_cb)(struct ffs_data *ffs);
+static void *(*ffs_acquire_dev_cb)(const char *dev_name);
+static void (*ffs_release_dev_cb)(struct ffs_data *ffs_data);
/* The endpoints structures *************************************************/
@@ -487,7 +276,7 @@ static ssize_t ffs_ep0_write(struct file *file, const char
__user *buf,
ffs->state = FFS_ACTIVE;
mutex_unlock(&ffs->mutex);
- ret = functionfs_ready_callback(ffs);
+ ret = ffs_ready_cb(ffs);
if (unlikely(ret < 0)) {
ffs->state = FFS_CLOSING;
return ret;
@@ -1229,7 +1018,7 @@ ffs_fs_mount(struct file_system_type *t, int flags,
if (unlikely(ret < 0))
return ERR_PTR(ret);
- ffs_dev = functionfs_acquire_dev_callback(dev_name);
+ ffs_dev = ffs_acquire_dev_cb(dev_name);
if (IS_ERR(ffs_dev))
return ffs_dev;
@@ -1239,7 +1028,7 @@ ffs_fs_mount(struct file_system_type *t, int flags,
/* data.ffs_data is set by ffs_sb_fill */
if (IS_ERR(rv))
- functionfs_release_dev_callback(data.ffs_data);
+ ffs_release_dev_cb(data.ffs_data);
return rv;
}
@@ -1251,7 +1040,7 @@ ffs_fs_kill_sb(struct super_block *sb)
kill_litter_super(sb);
if (sb->s_fs_info) {
- functionfs_release_dev_callback(sb->s_fs_info);
+ ffs_release_dev_cb(sb->s_fs_info);
ffs_data_put(sb->s_fs_info);
}
}
@@ -1264,15 +1053,26 @@ static struct file_system_type ffs_fs_type = {
};
MODULE_ALIAS_FS("functionfs");
-
/* Driver's main init/cleanup functions *************************************/
-static int functionfs_init(void)
+int functionfs_init(struct ffs_callback_ops *cb_ops)
{
int ret;
ENTER();
+ if (!cb_ops || !cb_ops->ready || !cb_ops->close ||
+ !cb_ops->acquire_dev || !cb_ops->release_dev) {
+ ret = -ENODEV;
+ pr_err("no callback operations for file system (%d)\n", ret);
+ return ret;
+ }
+
+ ffs_ready_cb = cb_ops->ready;
+ ffs_closed_cb = cb_ops->close;
+ ffs_acquire_dev_cb = cb_ops->acquire_dev;
+ ffs_release_dev_cb = cb_ops->release_dev;
+
ret = register_filesystem(&ffs_fs_type);
if (likely(!ret))
pr_info("file system registered\n");
@@ -1281,15 +1081,20 @@ static int functionfs_init(void)
return ret;
}
+#ifndef USB_FFS_INCLUDED
+EXPORT_SYMBOL(functionfs_init);
+#endif
-static void functionfs_cleanup(void)
+void functionfs_cleanup(void)
{
ENTER();
pr_info("unloading\n");
unregister_filesystem(&ffs_fs_type);
}
-
+#ifndef USB_FFS_INCLUDED
+EXPORT_SYMBOL(functionfs_cleanup);
+#endif
/* ffs_data and ffs_function construction and destruction code **************/
@@ -1364,7 +1169,7 @@ static void ffs_data_clear(struct ffs_data *ffs)
ENTER();
if (test_and_clear_bit(FFS_FL_CALL_CLOSED_CALLBACK, &ffs->flags))
- functionfs_closed_callback(ffs);
+ ffs_closed_cb(ffs);
BUG_ON(ffs->gadget);
@@ -1404,7 +1209,7 @@ static void ffs_data_reset(struct ffs_data *ffs)
}
-static int functionfs_bind(struct ffs_data *ffs, struct usb_composite_dev
*cdev)
+int functionfs_bind(struct ffs_data *ffs, struct usb_composite_dev *cdev)
{
struct usb_gadget_strings **lang;
int first_id;
@@ -1437,8 +1242,11 @@ static int functionfs_bind(struct ffs_data *ffs, struct
usb_composite_dev *cdev)
ffs_data_get(ffs);
return 0;
}
+#ifndef USB_FFS_INCLUDED
+EXPORT_SYMBOL(functionfs_bind);
+#endif
-static void functionfs_unbind(struct ffs_data *ffs)
+void functionfs_unbind(struct ffs_data *ffs)
{
ENTER();
@@ -1450,6 +1258,9 @@ static void functionfs_unbind(struct ffs_data *ffs)
clear_bit(FFS_FL_BOUND, &ffs->flags);
}
}
+#ifndef USB_FFS_INCLUDED
+EXPORT_SYMBOL(functionfs_unbind);
+#endif
static int ffs_epfiles_create(struct ffs_data *ffs)
{
@@ -1500,6 +1311,8 @@ static void ffs_epfiles_destroy(struct ffs_epfile
*epfiles, unsigned count)
kfree(epfiles);
}
+#ifdef USB_FFS_INCLUDED
+
static int functionfs_bind_config(struct usb_composite_dev *cdev,
struct usb_configuration *c,
struct ffs_data *ffs)
@@ -1536,6 +1349,74 @@ static int functionfs_bind_config(struct
usb_composite_dev *cdev,
return ret;
}
+#else
+
+static void functionfs_free_inst(struct usb_function_instance *f)
+{
+ struct ffs_opts *opts;
+
+ opts = container_of(f, struct ffs_opts, func_inst);
+ kfree(opts);
+}
+
+static struct usb_function_instance *functionfs_alloc_inst(void)
+{
+ struct ffs_opts *opts;
+
+ opts = kzalloc(sizeof(*opts), GFP_KERNEL);
+ if (!opts)
+ return ERR_PTR(-ENOMEM);
+
+ opts->func_inst.free_func_inst = functionfs_free_inst;
+
+ return &opts->func_inst;
+}
+
+static void functionfs_free(struct usb_function *f)
+{
+ struct ffs_function *ffs;
+
+ ffs = ffs_func_from_usb(f);
+ kfree(ffs);
+}
+
+static struct usb_function *functionfs_alloc(struct usb_function_instance *fi)
+{
+ struct ffs_function *func;
+ struct ffs_opts *opts;
+
+ ENTER();
+
+ func = kzalloc(sizeof(*func), GFP_KERNEL);
+ if (unlikely(!func))
+ return ERR_PTR(-ENOMEM);
+
+ opts = container_of(fi, struct ffs_opts, func_inst);
+
+ func->function.name = "Function FS Gadget";
+ func->function.strings = opts->ffs->stringtabs;
+
+ func->function.bind = ffs_func_bind;
+ func->function.unbind = ffs_func_unbind;
+ func->function.set_alt = ffs_func_set_alt;
+ func->function.disable = ffs_func_disable;
+ func->function.setup = ffs_func_setup;
+ func->function.suspend = ffs_func_suspend;
+ func->function.resume = ffs_func_resume;
+ func->function.free_func = functionfs_free;
+
+ func->conf = opts->conf;
+ func->gadget = opts->conf->cdev->gadget;
+ func->ffs = opts->ffs;
+ ffs_data_get(func->ffs);
+
+ return &func->function;
+}
+
+DECLARE_USB_FUNCTION_INIT(functionfs, functionfs_alloc_inst, functionfs_alloc);
+
+#endif
+
static void ffs_func_free(struct ffs_function *func)
{
struct ffs_ep *ep = func->eps;
@@ -1553,10 +1434,12 @@ static void ffs_func_free(struct ffs_function *func)
++ep;
} while (--count);
spin_unlock_irqrestore(&func->ffs->eps_lock, flags);
-
ffs_data_put(func->ffs);
kfree(func->eps);
+ func->eps = NULL;
+
+#ifdef USB_FFS_INCLUDED
/*
* eps and interfaces_nums are allocated in the same chunk so
* only one free is required. Descriptors are also allocated
@@ -1564,6 +1447,7 @@ static void ffs_func_free(struct ffs_function *func)
*/
kfree(func);
+#endif
}
static void ffs_func_eps_disable(struct ffs_function *func)
@@ -2493,3 +2377,8 @@ static char *ffs_prepare_buffer(const char __user *buf,
size_t len)
return data;
}
+
+#ifndef USB_FFS_INCLUDED
+MODULE_LICENSE("GPL");
+MODULE_AUTHOR("Michal Nazarewicz");
+#endif
diff --git a/drivers/usb/gadget/f_fs.h b/drivers/usb/gadget/f_fs.h
new file mode 100644
index 0000000..e453b5f
--- /dev/null
+++ b/drivers/usb/gadget/f_fs.h
@@ -0,0 +1,246 @@
+/*
+ * u_fs.h
+ *
+ * Utility definitions for the Function FS function
+ *
+ * Copyright (c) 2013 Samsung Electronics Co., Ltd.
+ * http://www.samsung.com
+ *
+ * Author: Michal Nazarewicz <min...@mina86.com>
+ * Author: Andrzej Pietrasiewicz <andrze...@samsung.com>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ */
+
+#ifndef U_F_FS_H
+#define U_F_FS_H
+
+#include <linux/usb/composite.h>
+
+/* Debugging ****************************************************************/
+
+#ifdef VERBOSE_DEBUG
+#ifndef pr_vdebug
+# define pr_vdebug pr_debug
+#endif /* pr_vdebug */
+# define ffs_dump_mem(prefix, ptr, len) \
+ print_hex_dump_bytes(pr_fmt(prefix ": "), DUMP_PREFIX_NONE, ptr, len)
+#else
+#ifndef pr_vdebug
+# define pr_vdebug(...) do { } while (0)
+#endif /* pr_vdebug */
+# define ffs_dump_mem(prefix, ptr, len) do { } while (0)
+#endif /* VERBOSE_DEBUG */
+
+#define ENTER() pr_vdebug("%s()\n", __func__)
+
+/* The data structure and setup file ****************************************/
+
+enum ffs_state {
+ /*
+ * Waiting for descriptors and strings.
+ *
+ * In this state no open(2), read(2) or write(2) on epfiles
+ * may succeed (which should not be the problem as there
+ * should be no such files opened in the first place).
+ */
+ FFS_READ_DESCRIPTORS,
+ FFS_READ_STRINGS,
+
+ /*
+ * We've got descriptors and strings. We are or have called
+ * functionfs_ready_callback(). functionfs_bind() may have
+ * been called but we don't know.
+ *
+ * This is the only state in which operations on epfiles may
+ * succeed.
+ */
+ FFS_ACTIVE,
+
+ /*
+ * All endpoints have been closed. This state is also set if
+ * we encounter an unrecoverable error. The only
+ * unrecoverable error is situation when after reading strings
+ * from user space we fail to initialise epfiles or
+ * functionfs_ready_callback() returns with error (<0).
+ *
+ * In this state no open(2), read(2) or write(2) (both on ep0
+ * as well as epfile) may succeed (at this point epfiles are
+ * unlinked and all closed so this is not a problem; ep0 is
+ * also closed but ep0 file exists and so open(2) on ep0 must
+ * fail).
+ */
+ FFS_CLOSING
+};
+
+
+enum ffs_setup_state {
+ /* There is no setup request pending. */
+ FFS_NO_SETUP,
+ /*
+ * User has read events and there was a setup request event
+ * there. The next read/write on ep0 will handle the
+ * request.
+ */
+ FFS_SETUP_PENDING,
+ /*
+ * There was event pending but before user space handled it
+ * some other event was introduced which canceled existing
+ * setup. If this state is set read/write on ep0 return
+ * -EIDRM. This state is only set when adding event.
+ */
+ FFS_SETUP_CANCELED
+};
+
+
+
+struct ffs_epfile;
+struct ffs_function;
+
+struct ffs_data {
+ struct usb_gadget *gadget;
+
+ /*
+ * Protect access read/write operations, only one read/write
+ * at a time. As a consequence protects ep0req and company.
+ * While setup request is being processed (queued) this is
+ * held.
+ */
+ struct mutex mutex;
+
+ /*
+ * Protect access to endpoint related structures (basically
+ * usb_ep_queue(), usb_ep_dequeue(), etc. calls) except for
+ * endpoint zero.
+ */
+ spinlock_t eps_lock;
+
+ /*
+ * XXX REVISIT do we need our own request? Since we are not
+ * handling setup requests immediately user space may be so
+ * slow that another setup will be sent to the gadget but this
+ * time not to us but another function and then there could be
+ * a race. Is that the case? Or maybe we can use cdev->req
+ * after all, maybe we just need some spinlock for that?
+ */
+ struct usb_request *ep0req; /* P: mutex */
+ struct completion ep0req_completion; /* P: mutex */
+ int ep0req_status; /* P: mutex */
+
+ /* reference counter */
+ atomic_t ref;
+ /* how many files are opened (EP0 and others) */
+ atomic_t opened;
+
+ /* EP0 state */
+ enum ffs_state state;
+
+ /*
+ * Possible transitions:
+ * + FFS_NO_SETUP -> FFS_SETUP_PENDING -- P: ev.waitq.lock
+ * happens only in ep0 read which is P: mutex
+ * + FFS_SETUP_PENDING -> FFS_NO_SETUP -- P: ev.waitq.lock
+ * happens only in ep0 i/o which is P: mutex
+ * + FFS_SETUP_PENDING -> FFS_SETUP_CANCELED -- P: ev.waitq.lock
+ * + FFS_SETUP_CANCELED -> FFS_NO_SETUP -- cmpxchg
+ */
+ enum ffs_setup_state setup_state;
+
+#define FFS_SETUP_STATE(ffs) \
+ ((enum ffs_setup_state)cmpxchg(&(ffs)->setup_state, \
+ FFS_SETUP_CANCELED, FFS_NO_SETUP))
+
+ /* Events & such. */
+ struct {
+ u8 types[4];
+ unsigned short count;
+ /* XXX REVISIT need to update it in some places, or do we? */
+ unsigned short can_stall;
+ struct usb_ctrlrequest setup;
+
+ wait_queue_head_t waitq;
+ } ev; /* the whole structure, P: ev.waitq.lock */
+
+ /* Flags */
+ unsigned long flags;
+#define FFS_FL_CALL_CLOSED_CALLBACK 0
+#define FFS_FL_BOUND 1
+
+ /* Active function */
+ struct ffs_function *func;
+
+ /*
+ * Device name, write once when file system is mounted.
+ * Intended for user to read if she wants.
+ */
+ const char *dev_name;
+ /* Private data for our user (ie. gadget). Managed by user. */
+ void *private_data;
+
+ /* filled by __ffs_data_got_descs() */
+ /*
+ * Real descriptors are 16 bytes after raw_descs (so you need
+ * to skip 16 bytes (ie. ffs->raw_descs + 16) to get to the
+ * first full speed descriptor). raw_descs_length and
+ * raw_fs_descs_length do not have those 16 bytes added.
+ */
+ const void *raw_descs;
+ unsigned raw_descs_length;
+ unsigned raw_fs_descs_length;
+ unsigned fs_descs_count;
+ unsigned hs_descs_count;
+
+ unsigned short strings_count;
+ unsigned short interfaces_count;
+ unsigned short eps_count;
+ unsigned short _pad1;
+
+ /* filled by __ffs_data_got_strings() */
+ /* ids in stringtabs are set in functionfs_bind() */
+ const void *raw_strings;
+ struct usb_gadget_strings **stringtabs;
+
+ /*
+ * File system's super block, write once when file system is
+ * mounted.
+ */
+ struct super_block *sb;
+
+ /* File permissions, written once when fs is mounted */
+ struct ffs_file_perms {
+ umode_t mode;
+ kuid_t uid;
+ kgid_t gid;
+ } file_perms;
+
+ /*
+ * The endpoint files, filled by ffs_epfiles_create(),
+ * destroyed by ffs_epfiles_destroy().
+ */
+ struct ffs_epfile *epfiles;
+};
+
+struct ffs_callback_ops {
+ int (*ready)(struct ffs_data *ffs);
+ void (*close)(struct ffs_data *ffs);
+ void *(*acquire_dev)(const char *dev_name);
+ void (*release_dev)(struct ffs_data *ffs_data);
+};
+
+struct ffs_opts {
+ struct usb_function_instance func_inst;
+ struct usb_configuration *conf;
+ struct ffs_data *ffs;
+};
+
+int functionfs_init(struct ffs_callback_ops *cb_ops)
+ __attribute__((warn_unused_result));
+void functionfs_cleanup(void);
+int functionfs_bind(struct ffs_data *ffs, struct usb_composite_dev *cdev)
+ __attribute__((warn_unused_result, nonnull));
+void functionfs_unbind(struct ffs_data *ffs)
+ __attribute__((nonnull));
+
+#endif /* U_F_FS_H */
diff --git a/drivers/usb/gadget/g_ffs.c b/drivers/usb/gadget/g_ffs.c
index 71164fb..1914c3d 100644
--- a/drivers/usb/gadget/g_ffs.c
+++ b/drivers/usb/gadget/g_ffs.c
@@ -54,6 +54,7 @@ static int rndis_bind_config(struct usb_configuration *c,
struct eth_dev;
#endif
+#define USB_FFS_INCLUDED
#include "f_fs.c"
#define DRIVER_NAME "g_ffs"
@@ -187,6 +188,22 @@ static bool gfs_registered;
static bool gfs_single_func;
static struct gfs_ffs_obj *ffs_tab;
+static int functionfs_ready_callback(struct ffs_data *ffs)
+ __attribute__((warn_unused_result, nonnull));
+static void functionfs_closed_callback(struct ffs_data *ffs)
+ __attribute__((nonnull));
+static void *functionfs_acquire_dev_callback(const char *dev_name)
+ __attribute__((warn_unused_result, nonnull));
+static void functionfs_release_dev_callback(struct ffs_data *ffs_data)
+ __attribute__((nonnull));
+
+static struct ffs_callback_ops ffs_cb_ops = {
+ .ready = functionfs_ready_callback,
+ .close = functionfs_closed_callback,
+ .acquire_dev = functionfs_acquire_dev_callback,
+ .release_dev = functionfs_release_dev_callback,
+};
+
static inline
struct gfs_configuration *to_gfs_configuration(struct usb_configuration *c)
{
@@ -214,7 +231,7 @@ static int __init gfs_init(void)
missing_funcs = func_num;
- return functionfs_init();
+ return functionfs_init(&ffs_cb_ops);
}
module_init(gfs_init);
--
1.7.0.4
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