projects / linux-2.6-block.git / blame
| Commit | Line | Data |
|---|---|---|
| 0062f6e5 SAS |
1 | #include <linux/kernel.h> |
| 2 | #include <linux/slab.h> | |
| 3 | #include <linux/module.h> | |
| 4 | #include <linux/err.h> | |
| 5 | ||
| 6 | #include <linux/usb/composite.h> | |
| 7 | ||
| 8 | static LIST_HEAD(func_list); | |
| 9 | static DEFINE_MUTEX(func_lock); | |
| 10 | ||
| 11 | static struct usb_function_instance *try_get_usb_function_instance(const char *name) | |
| 12 | { | |
| 13 | struct usb_function_driver *fd; | |
| 14 | struct usb_function_instance *fi; | |
| 15 | ||
| 16 | fi = ERR_PTR(-ENOENT); | |
| 17 | mutex_lock(&func_lock); | |
| 18 | list_for_each_entry(fd, &func_list, list) { | |
| 19 | ||
| 20 | if (strcmp(name, fd->name)) | |
| 21 | continue; | |
| 22 | ||
| 23 | if (!try_module_get(fd->mod)) { | |
| 24 | fi = ERR_PTR(-EBUSY); | |
| 25 | break; | |
| 26 | } | |
| 27 | fi = fd->alloc_inst(); | |
| 28 | if (IS_ERR(fi)) | |
| 29 | module_put(fd->mod); | |
| 30 | else | |
| 31 | fi->fd = fd; | |
| 32 | break; | |
| 33 | } | |
| 34 | mutex_unlock(&func_lock); | |
| 35 | return fi; | |
| 36 | } | |
| 37 | ||
| 38 | struct usb_function_instance *usb_get_function_instance(const char *name) | |
| 39 | { | |
| 40 | struct usb_function_instance *fi; | |
| 41 | int ret; | |
| 42 | ||
| 43 | fi = try_get_usb_function_instance(name); | |
| 44 | if (!IS_ERR(fi)) | |
| 45 | return fi; | |
| 46 | ret = PTR_ERR(fi); | |
| 47 | if (ret != -ENOENT) | |
| 48 | return fi; | |
| 49 | ret = request_module("usbfunc:%s", name); | |
| 50 | if (ret < 0) | |
| 51 | return ERR_PTR(ret); | |
| 52 | return try_get_usb_function_instance(name); | |
| 53 | } | |
| 54 | EXPORT_SYMBOL_GPL(usb_get_function_instance); | |
| 55 | ||
| 56 | struct usb_function *usb_get_function(struct usb_function_instance *fi) | |
| 57 | { | |
| 58 | struct usb_function *f; | |
| 59 | ||
| 60 | f = fi->fd->alloc_func(fi); | |
| 61 | if (IS_ERR(f)) | |
| 62 | return f; | |
| 63 | f->fi = fi; | |
| 64 | return f; | |
| 65 | } | |
| 66 | EXPORT_SYMBOL_GPL(usb_get_function); | |
| 67 | ||
| 68 | void usb_put_function_instance(struct usb_function_instance *fi) | |
| 69 | { | |
| 70 | struct module *mod; | |
| 71 | ||
| 72 | if (!fi) | |
| 73 | return; | |
| 74 | ||
| 75 | mod = fi->fd->mod; | |
| 76 | fi->free_func_inst(fi); | |
| 77 | module_put(mod); | |
| 78 | } | |
| 79 | EXPORT_SYMBOL_GPL(usb_put_function_instance); | |
| 80 | ||
| 81 | void usb_put_function(struct usb_function *f) | |
| 82 | { | |
| 83 | if (!f) | |
| 84 | return; | |
| 85 | ||
| 86 | f->free_func(f); | |
| 87 | } | |
| 88 | EXPORT_SYMBOL_GPL(usb_put_function); | |
| 89 | ||
| 90 | int usb_function_register(struct usb_function_driver *newf) | |
| 91 | { | |
| 92 | struct usb_function_driver *fd; | |
| 93 | int ret; | |
| 94 | ||
| 95 | ret = -EEXIST; | |
| 96 | ||
| 97 | mutex_lock(&func_lock); | |
| 98 | list_for_each_entry(fd, &func_list, list) { | |
| 99 | if (!strcmp(fd->name, newf->name)) | |
| 100 | goto out; | |
| 101 | } | |
| 102 | ret = 0; | |
| 103 | list_add_tail(&newf->list, &func_list); | |
| 104 | out: | |
| 105 | mutex_unlock(&func_lock); | |
| 106 | return ret; | |
| 107 | } | |
| 108 | EXPORT_SYMBOL_GPL(usb_function_register); | |
| 109 | ||
| 110 | void usb_function_unregister(struct usb_function_driver *fd) | |
| 111 | { | |
| 112 | mutex_lock(&func_lock); | |
| 113 | list_del(&fd->list); | |
| 114 | mutex_unlock(&func_lock); | |
| 115 | } | |
| 116 | EXPORT_SYMBOL_GPL(usb_function_unregister); |