1 #include <linux/module.h>
2 #include <linux/utsname.h>
6 * kbuild is not very cooperative with respect to linking separately
7 * compiled library objects into one module. So for now we won't use
8 * separate compilation ... ensuring init/exit sections work to shrink
9 * the runtime footprint, and giving us at least some parts of what
10 * a "gcc --combine ... part1.c part2.c part3.c ... " build would.
13 #include "composite.c"
14 #include "usbstring.c"
16 #include "epautoconf.c"
18 #if defined CONFIG_USB_FUNCTIONFS_ETH || defined CONFIG_USB_FUNCTIONFS_RNDIS
19 # if defined USB_ETH_RNDIS
22 # ifdef CONFIG_USB_FUNCTIONFS_RNDIS
23 # define USB_ETH_RNDIS y
27 # include "f_subset.c"
34 static u8 gfs_hostaddr[ETH_ALEN];
35 # ifdef CONFIG_USB_FUNCTIONFS_ETH
36 static int eth_bind_config(struct usb_configuration *c, u8 ethaddr[ETH_ALEN]);
39 # define gether_cleanup() do { } while (0)
40 # define gether_setup(gadget, hostaddr) ((int)0)
41 # define gfs_hostaddr NULL
47 #define DRIVER_NAME "g_ffs"
48 #define DRIVER_DESC "USB Function Filesystem"
49 #define DRIVER_VERSION "24 Aug 2004"
51 MODULE_DESCRIPTION(DRIVER_DESC);
52 MODULE_AUTHOR("Michal Nazarewicz");
53 MODULE_LICENSE("GPL");
55 #define GFS_VENDOR_ID 0x1d6b /* Linux Foundation */
56 #define GFS_PRODUCT_ID 0x0105 /* FunctionFS Gadget */
58 static struct usb_device_descriptor gfs_dev_desc = {
59 .bLength = sizeof gfs_dev_desc,
60 .bDescriptorType = USB_DT_DEVICE,
62 .bcdUSB = cpu_to_le16(0x0200),
63 .bDeviceClass = USB_CLASS_PER_INTERFACE,
65 .idVendor = cpu_to_le16(GFS_VENDOR_ID),
66 .idProduct = cpu_to_le16(GFS_PRODUCT_ID),
69 module_param_named(bDeviceClass, gfs_dev_desc.bDeviceClass, byte, 0644);
70 MODULE_PARM_DESC(bDeviceClass, "USB Device class");
71 module_param_named(bDeviceSubClass, gfs_dev_desc.bDeviceSubClass, byte, 0644);
72 MODULE_PARM_DESC(bDeviceSubClass, "USB Device subclass");
73 module_param_named(bDeviceProtocol, gfs_dev_desc.bDeviceProtocol, byte, 0644);
74 MODULE_PARM_DESC(bDeviceProtocol, "USB Device protocol");
78 static const struct usb_descriptor_header *gfs_otg_desc[] = {
79 (const struct usb_descriptor_header *)
80 &(const struct usb_otg_descriptor) {
81 .bLength = sizeof(struct usb_otg_descriptor),
82 .bDescriptorType = USB_DT_OTG,
85 * REVISIT SRP-only hardware is possible, although
86 * it would not be called "OTG" ...
88 .bmAttributes = USB_OTG_SRP | USB_OTG_HNP,
94 /* string IDs are assigned dynamically */
96 static struct usb_string gfs_strings[] = {
97 #ifdef CONFIG_USB_FUNCTIONFS_RNDIS
98 { .s = "FunctionFS + RNDIS" },
100 #ifdef CONFIG_USB_FUNCTIONFS_ETH
101 { .s = "FunctionFS + ECM" },
103 #ifdef CONFIG_USB_FUNCTIONFS_GENERIC
104 { .s = "FunctionFS" },
106 { } /* end of list */
109 static struct usb_gadget_strings *gfs_dev_strings[] = {
110 &(struct usb_gadget_strings) {
111 .language = 0x0409, /* en-us */
112 .strings = gfs_strings,
119 struct gfs_configuration {
120 struct usb_configuration c;
121 int (*eth)(struct usb_configuration *c, u8 *ethaddr);
122 } gfs_configurations[] = {
123 #ifdef CONFIG_USB_FUNCTIONFS_RNDIS
125 .eth = rndis_bind_config,
129 #ifdef CONFIG_USB_FUNCTIONFS_ETH
131 .eth = eth_bind_config,
135 #ifdef CONFIG_USB_FUNCTIONFS_GENERIC
142 static int gfs_bind(struct usb_composite_dev *cdev);
143 static int gfs_unbind(struct usb_composite_dev *cdev);
144 static int gfs_do_config(struct usb_configuration *c);
146 static struct usb_composite_driver gfs_driver = {
148 .dev = &gfs_dev_desc,
149 .strings = gfs_dev_strings,
150 .unbind = gfs_unbind,
151 .iProduct = DRIVER_DESC,
155 static struct ffs_data *gfs_ffs_data;
156 static unsigned long gfs_registered;
159 static int gfs_init(void)
163 return functionfs_init();
165 module_init(gfs_init);
167 static void gfs_exit(void)
171 if (test_and_clear_bit(0, &gfs_registered))
172 usb_composite_unregister(&gfs_driver);
174 functionfs_cleanup();
176 module_exit(gfs_exit);
179 static int functionfs_ready_callback(struct ffs_data *ffs)
185 if (WARN_ON(test_and_set_bit(0, &gfs_registered)))
189 ret = usb_composite_probe(&gfs_driver, gfs_bind);
190 if (unlikely(ret < 0))
191 clear_bit(0, &gfs_registered);
195 static void functionfs_closed_callback(struct ffs_data *ffs)
199 if (test_and_clear_bit(0, &gfs_registered))
200 usb_composite_unregister(&gfs_driver);
204 static int functionfs_check_dev_callback(const char *dev_name)
211 static int gfs_bind(struct usb_composite_dev *cdev)
217 if (WARN_ON(!gfs_ffs_data))
220 ret = gether_setup(cdev->gadget, gfs_hostaddr);
221 if (unlikely(ret < 0))
224 ret = usb_string_ids_tab(cdev, gfs_strings);
225 if (unlikely(ret < 0))
228 ret = functionfs_bind(gfs_ffs_data, cdev);
229 if (unlikely(ret < 0))
232 for (i = 0; i < ARRAY_SIZE(gfs_configurations); ++i) {
233 struct gfs_configuration *c = gfs_configurations + i;
235 c->c.label = gfs_strings[i].s;
236 c->c.iConfiguration = gfs_strings[i].id;
237 c->c.bConfigurationValue = 1 + i;
238 c->c.bmAttributes = USB_CONFIG_ATT_SELFPOWER;
240 ret = usb_add_config(cdev, &c->c, gfs_do_config);
241 if (unlikely(ret < 0))
248 functionfs_unbind(gfs_ffs_data);
256 static int gfs_unbind(struct usb_composite_dev *cdev)
261 * We may have been called in an error recovery from
262 * composite_bind() after gfs_unbind() failure so we need to
263 * check if gfs_ffs_data is not NULL since gfs_bind() handles
264 * all error recovery itself. I'd rather we werent called
265 * from composite on orror recovery, but what you're gonna
270 functionfs_unbind(gfs_ffs_data);
278 static int gfs_do_config(struct usb_configuration *c)
280 struct gfs_configuration *gc =
281 container_of(c, struct gfs_configuration, c);
284 if (WARN_ON(!gfs_ffs_data))
287 if (gadget_is_otg(c->cdev->gadget)) {
288 c->descriptors = gfs_otg_desc;
289 c->bmAttributes |= USB_CONFIG_ATT_WAKEUP;
293 ret = gc->eth(c, gfs_hostaddr);
294 if (unlikely(ret < 0))
298 ret = functionfs_bind_config(c->cdev, c, gfs_ffs_data);
299 if (unlikely(ret < 0))
303 * After previous do_configs there may be some invalid
304 * pointers in c->interface array. This happens every time
305 * a user space function with fewer interfaces than a user
306 * space function that was run before the new one is run. The
307 * compasit's set_config() assumes that if there is no more
308 * then MAX_CONFIG_INTERFACES interfaces in a configuration
309 * then there is a NULL pointer after the last interface in
310 * c->interface array. We need to make sure this is true.
312 if (c->next_interface_id < ARRAY_SIZE(c->interface))
313 c->interface[c->next_interface_id] = NULL;
319 #ifdef CONFIG_USB_FUNCTIONFS_ETH
321 static int eth_bind_config(struct usb_configuration *c, u8 ethaddr[ETH_ALEN])
323 return can_support_ecm(c->cdev->gadget)
324 ? ecm_bind_config(c, ethaddr)
325 : geth_bind_config(c, ethaddr);