This will be required in order to use the new function interface
(usb_get_function_instance/usb_put_function_instance)
Signed-off-by: Andrzej Pietrasiewicz
Signed-off-by: Kyunmgin Park
---
drivers/usb/gadget/f_fs.c | 238 ++-
drivers/usb/gadget/g_ffs.c | 175 ++---
drivers/usb/gadget/u_fs.h | 24
include/linux/usb/functionfs.h | 14 ---
4 files changed, 314 insertions(+), 137 deletions(-)
diff --git a/drivers/usb/gadget/f_fs.c b/drivers/usb/gadget/f_fs.c
index 9c946cd..8c45dc3 100644
--- a/drivers/usb/gadget/f_fs.c
+++ b/drivers/usb/gadget/f_fs.c
@@ -90,7 +90,7 @@ enum ffs_state {
/*
* We've got descriptors and strings. We are or have called
-* functionfs_ready_callback(). functionfs_bind() may have
+* ffs_ready(). functionfs_bind() may have
* been called but we don't know.
*
* This is the only state in which operations on epfiles may
@@ -103,7 +103,7 @@ enum ffs_state {
* 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).
+* ffs_ready() 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
@@ -361,6 +361,15 @@ ffs_sb_create_file(struct super_block *sb, const char
*name, void *data,
const struct file_operations *fops,
struct dentry **dentry_p);
+/* Devices management ***/
+
+DEFINE_MUTEX(ffs_lock);
+
+static struct ffs_dev *ffs_find_dev(const char *name);
+static void *ffs_acquire_dev(const char *dev_name);
+static void ffs_release_dev(struct ffs_data *ffs_data);
+static int ffs_ready(struct ffs_data *ffs);
+static void ffs_closed(struct ffs_data *ffs);
/* Misc helper functions /
@@ -486,7 +495,7 @@ 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(ffs);
if (unlikely(ret < 0)) {
ffs->state = FFS_CLOSING;
return ret;
@@ -1217,7 +1226,7 @@ ffs_fs_mount(struct file_system_type *t, int flags,
return ERR_PTR(-ENOMEM);
}
- ffs_dev = functionfs_acquire_dev_callback(dev_name);
+ ffs_dev = ffs_acquire_dev(dev_name);
if (IS_ERR(ffs_dev)) {
ffs_data_put(ffs);
return ERR_CAST(ffs_dev);
@@ -1227,7 +1236,7 @@ ffs_fs_mount(struct file_system_type *t, int flags,
rv = mount_nodev(t, flags, &data, ffs_sb_fill);
if (IS_ERR(rv) && data.ffs_data) {
- functionfs_release_dev_callback(data.ffs_data);
+ ffs_release_dev(data.ffs_data);
ffs_data_put(data.ffs_data);
}
return rv;
@@ -1240,7 +1249,7 @@ 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(sb->s_fs_info);
ffs_data_put(sb->s_fs_info);
}
}
@@ -1353,7 +1362,7 @@ 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(ffs);
BUG_ON(ffs->gadget);
@@ -2465,6 +2474,221 @@ static int ffs_func_revmap_intf(struct ffs_function
*func, u8 intf)
}
+/* Devices management ***/
+
+static LIST_HEAD(ffs_devices);
+
+static struct ffs_dev *_ffs_find_dev(const char *name)
+{
+ struct ffs_dev *dev;
+
+ list_for_each_entry(dev, &ffs_devices, entry) {
+ if (!dev->name || !name)
+ continue;
+ if (strcmp(dev->name, name) == 0)
+ return dev;
+ }
+
+ return NULL;
+}
+
+/*
+ * ffs_lock must be taken by the caller of this function
+ */
+static struct ffs_dev *ffs_get_single_dev(void)
+{
+ struct ffs_dev *dev;
+
+ if (list_is_singular(&ffs_devices)) {
+ dev = list_first_entry(&ffs_devices, struct ffs_dev, entry);
+ if (dev->single)
+ return dev;
+ }
+
+ return NULL;
+}
+
+/*
+ * ffs_lock must be taken by the caller of this function
+ */
+static struct ffs_dev *ffs_find_dev(const char *name)
+{
+ struct ffs_dev *dev;
+
+ dev = ffs_get_single
